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linux/drivers/hid/wacom_sys.c

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/*
* drivers/input/tablet/wacom_sys.c
*
* USB Wacom tablet support - system specific code
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include "wacom_wac.h"
#include "wacom.h"
#include <linux/input/mt.h>
#define WAC_MSG_RETRIES 5
#define WAC_CMD_WL_LED_CONTROL 0x03
#define WAC_CMD_LED_CONTROL 0x20
#define WAC_CMD_ICON_START 0x21
#define WAC_CMD_ICON_XFER 0x23
#define WAC_CMD_ICON_BT_XFER 0x26
#define WAC_CMD_RETRIES 10
#define WAC_CMD_DELETE_PAIRING 0x20
#define WAC_CMD_UNPAIR_ALL 0xFF
#define WAC_REMOTE_SERIAL_MAX_STRLEN 9
#define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
#define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
#define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
size_t size, unsigned int retries)
{
int retval;
do {
retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
HID_REQ_GET_REPORT);
} while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
if (retval < 0)
hid_err(hdev, "wacom_get_report: ran out of retries "
"(last error = %d)\n", retval);
return retval;
}
static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
size_t size, unsigned int retries)
{
int retval;
do {
retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
HID_REQ_SET_REPORT);
} while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
if (retval < 0)
hid_err(hdev, "wacom_set_report: ran out of retries "
"(last error = %d)\n", retval);
return retval;
}
static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *raw_data, int size)
{
struct wacom *wacom = hid_get_drvdata(hdev);
if (size > WACOM_PKGLEN_MAX)
return 1;
memcpy(wacom->wacom_wac.data, raw_data, size);
wacom_wac_irq(&wacom->wacom_wac, size);
return 0;
}
static int wacom_open(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);
HID: wacom: fix freeze on open when autosuspend is on Since the conversion from USB to HID (in v3.17), some people reported a freeze on boot with the wacom driver. Hans managed to get a stacktrace: [ 240.272331] Call Trace: [ 240.272338] [<ffffffff813de7b9>] ? usb_hcd_submit_urb+0xa9/0xb10 [ 240.272347] [<ffffffff81555579>] schedule+0x29/0x70 [ 240.272355] [<ffffffff815559e6>] schedule_preempt_disabled+0x16/0x20 [ 240.272363] [<ffffffff81557365>] __mutex_lock_slowpath+0xe5/0x230 [ 240.272372] [<ffffffff815574c7>] mutex_lock+0x17/0x30 [ 240.272380] [<ffffffffa063c1d2>] wacom_resume+0x22/0x50 [wacom] [ 240.272396] [<ffffffffa01aea8a>] hid_resume_common+0xba/0x110 [usbhid] [ 240.272404] [<ffffffff813e5890>] ? usb_runtime_suspend+0x80/0x80 [ 240.272417] [<ffffffffa01aeb1d>] hid_resume+0x3d/0x70 [usbhid] [ 240.272425] [<ffffffff813e44a6>] usb_resume_interface.isra.6+0xb6/0x120 [ 240.272432] [<ffffffff813e4774>] usb_resume_both+0x74/0x140 [ 240.272439] [<ffffffff813e58aa>] usb_runtime_resume+0x1a/0x20 [ 240.272446] [<ffffffff813b1912>] __rpm_callback+0x32/0x70 [ 240.272453] [<ffffffff813b1976>] rpm_callback+0x26/0xa0 [ 240.272460] [<ffffffff813b2d71>] rpm_resume+0x4b1/0x690 [ 240.272468] [<ffffffff812ab992>] ? radix_tree_lookup_slot+0x22/0x50 [ 240.272475] [<ffffffff813b2c1a>] rpm_resume+0x35a/0x690 [ 240.272482] [<ffffffff8116e9c9>] ? zone_statistics+0x89/0xa0 [ 240.272489] [<ffffffff813b2f90>] __pm_runtime_resume+0x40/0x60 [ 240.272497] [<ffffffff813e4272>] usb_autopm_get_interface+0x22/0x60 [ 240.272509] [<ffffffffa01ae8d9>] usbhid_open+0x59/0xe0 [usbhid] [ 240.272517] [<ffffffffa063ac85>] wacom_open+0x35/0x50 [wacom] [ 240.272525] [<ffffffff813f37b9>] input_open_device+0x79/0xa0 [ 240.272534] [<ffffffffa048d1c1>] evdev_open+0x1b1/0x200 [evdev] [ 240.272543] [<ffffffff811c899e>] chrdev_open+0xae/0x1f0 [ 240.272549] [<ffffffff811c88f0>] ? cdev_put+0x30/0x30 [ 240.272556] [<ffffffff811c17e2>] do_dentry_open+0x1d2/0x320 [ 240.272562] [<ffffffff811c1cd1>] finish_open+0x31/0x50 [ 240.272571] [<ffffffff811d2202>] do_last.isra.36+0x652/0xe50 [ 240.272579] [<ffffffff811d2ac7>] path_openat+0xc7/0x6f0 [ 240.272586] [<ffffffff811cf012>] ? final_putname+0x22/0x50 [ 240.272594] [<ffffffff811d42d2>] ? user_path_at_empty+0x72/0xd0 [ 240.272602] [<ffffffff811d43fd>] do_filp_open+0x4d/0xc0 [...] So here, wacom_open is called, and then wacom_resume is called by the PM system. However, wacom_open already took the lock when wacom_resume tries to get it. Freeze. A little bit of history shows that this already happened in the past - commit f6cd378372bf ("Input: wacom - fix runtime PM related deadlock"), and the solution was to call first the PM function before taking the lock. The lock was introduced in commit commit e722409445fb ("Input: wacom - implement suspend and autosuspend") when the autosuspend feature has been added. Given that usbhid already takes care of this very same locking between suspend/resume, I think we can simply kill the lock in open/close. The lock is now used also with LEDs, so we can not remove it completely. Reported-by: Hans Spath <inbox-546@hans-spath.de> Tested-by: Hans Spath <inbox-546@hans-spath.de> CC: stable@vger.kernel.org # v3.17+ Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2014-12-01 09:52:40 -07:00
return hid_hw_open(wacom->hdev);
}
static void wacom_close(struct input_dev *dev)
{
struct wacom *wacom = input_get_drvdata(dev);
hid_hw_close(wacom->hdev);
}
/*
* Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
*/
static int wacom_calc_hid_res(int logical_extents, int physical_extents,
unsigned unit, int exponent)
{
struct hid_field field = {
.logical_maximum = logical_extents,
.physical_maximum = physical_extents,
.unit = unit,
.unit_exponent = exponent,
};
return hidinput_calc_abs_res(&field, ABS_X);
}
static void wacom_feature_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
u8 *data;
int ret;
switch (usage->hid) {
case HID_DG_CONTACTMAX:
/* leave touch_max as is if predefined */
if (!features->touch_max) {
/* read manually */
data = kzalloc(2, GFP_KERNEL);
if (!data)
break;
data[0] = field->report->id;
ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
data, 2, WAC_CMD_RETRIES);
if (ret == 2) {
features->touch_max = data[1];
} else {
features->touch_max = 16;
hid_warn(hdev, "wacom_feature_mapping: "
"could not get HID_DG_CONTACTMAX, "
"defaulting to %d\n",
features->touch_max);
}
kfree(data);
}
break;
case HID_DG_INPUTMODE:
/* Ignore if value index is out of bounds. */
if (usage->usage_index >= field->report_count) {
dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
break;
}
hid_data->inputmode = field->report->id;
hid_data->inputmode_index = usage->usage_index;
break;
}
}
/*
* Interface Descriptor of wacom devices can be incomplete and
* inconsistent so wacom_features table is used to store stylus
* device's packet lengths, various maximum values, and tablet
* resolution based on product ID's.
*
* For devices that contain 2 interfaces, wacom_features table is
* inaccurate for the touch interface. Since the Interface Descriptor
* for touch interfaces has pretty complete data, this function exists
* to query tablet for this missing information instead of hard coding in
* an additional table.
*
* A typical Interface Descriptor for a stylus will contain a
* boot mouse application collection that is not of interest and this
* function will ignore it.
*
* It also contains a digitizer application collection that also is not
* of interest since any information it contains would be duplicate
* of what is in wacom_features. Usually it defines a report of an array
* of bytes that could be used as max length of the stylus packet returned.
* If it happens to define a Digitizer-Stylus Physical Collection then
* the X and Y logical values contain valid data but it is ignored.
*
* A typical Interface Descriptor for a touch interface will contain a
* Digitizer-Finger Physical Collection which will define both logical
* X/Y maximum as well as the physical size of tablet. Since touch
* interfaces haven't supported pressure or distance, this is enough
* information to override invalid values in the wacom_features table.
*
* Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
* data. We deal with them after returning from this function.
*/
static void wacom_usage_mapping(struct hid_device *hdev,
struct hid_field *field, struct hid_usage *usage)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
bool finger = WACOM_FINGER_FIELD(field);
bool pen = WACOM_PEN_FIELD(field);
/*
* Requiring Stylus Usage will ignore boot mouse
* X/Y values and some cases of invalid Digitizer X/Y
* values commonly reported.
*/
if (pen)
features->device_type |= WACOM_DEVICETYPE_PEN;
else if (finger)
features->device_type |= WACOM_DEVICETYPE_TOUCH;
else
return;
/*
* Bamboo models do not support HID_DG_CONTACTMAX.
* And, Bamboo Pen only descriptor contains touch.
*/
if (features->type != BAMBOO_PT) {
/* ISDv4 touch devices at least supports one touch point */
if (finger && !features->touch_max)
features->touch_max = 1;
}
switch (usage->hid) {
case HID_GD_X:
features->x_max = field->logical_maximum;
if (finger) {
features->x_phy = field->physical_maximum;
if (features->type != BAMBOO_PT) {
features->unit = field->unit;
features->unitExpo = field->unit_exponent;
}
}
break;
case HID_GD_Y:
features->y_max = field->logical_maximum;
if (finger) {
features->y_phy = field->physical_maximum;
if (features->type != BAMBOO_PT) {
features->unit = field->unit;
features->unitExpo = field->unit_exponent;
}
}
break;
case HID_DG_TIPPRESSURE:
if (pen)
features->pressure_max = field->logical_maximum;
break;
}
if (features->type == HID_GENERIC)
wacom_wac_usage_mapping(hdev, field, usage);
}
static void wacom_post_parse_hid(struct hid_device *hdev,
struct wacom_features *features)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
if (features->type == HID_GENERIC) {
/* Any last-minute generic device setup */
if (features->touch_max > 1) {
input_mt_init_slots(wacom_wac->touch_input, wacom_wac->features.touch_max,
INPUT_MT_DIRECT);
}
}
}
static void wacom_parse_hid(struct hid_device *hdev,
struct wacom_features *features)
{
struct hid_report_enum *rep_enum;
struct hid_report *hreport;
int i, j;
/* check features first */
rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
list_for_each_entry(hreport, &rep_enum->report_list, list) {
for (i = 0; i < hreport->maxfield; i++) {
/* Ignore if report count is out of bounds. */
if (hreport->field[i]->report_count < 1)
continue;
for (j = 0; j < hreport->field[i]->maxusage; j++) {
wacom_feature_mapping(hdev, hreport->field[i],
hreport->field[i]->usage + j);
}
}
}
/* now check the input usages */
rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
list_for_each_entry(hreport, &rep_enum->report_list, list) {
if (!hreport->maxfield)
continue;
for (i = 0; i < hreport->maxfield; i++)
for (j = 0; j < hreport->field[i]->maxusage; j++)
wacom_usage_mapping(hdev, hreport->field[i],
hreport->field[i]->usage + j);
}
wacom_post_parse_hid(hdev, features);
}
static int wacom_hid_set_device_mode(struct hid_device *hdev)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
struct hid_report *r;
struct hid_report_enum *re;
if (hid_data->inputmode < 0)
return 0;
re = &(hdev->report_enum[HID_FEATURE_REPORT]);
r = re->report_id_hash[hid_data->inputmode];
if (r) {
r->field[0]->value[hid_data->inputmode_index] = 2;
hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
}
return 0;
}
static int wacom_set_device_mode(struct hid_device *hdev, int report_id,
int length, int mode)
{
unsigned char *rep_data;
int error = -ENOMEM, limit = 0;
rep_data = kzalloc(length, GFP_KERNEL);
if (!rep_data)
return error;
do {
rep_data[0] = report_id;
rep_data[1] = mode;
error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
length, 1);
if (error >= 0)
error = wacom_get_report(hdev, HID_FEATURE_REPORT,
rep_data, length, 1);
} while (error >= 0 && rep_data[1] != mode && limit++ < WAC_MSG_RETRIES);
kfree(rep_data);
return error < 0 ? error : 0;
}
static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
struct wacom_features *features)
{
struct wacom *wacom = hid_get_drvdata(hdev);
int ret;
u8 rep_data[2];
switch (features->type) {
case GRAPHIRE_BT:
rep_data[0] = 0x03;
rep_data[1] = 0x00;
ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
3);
if (ret >= 0) {
rep_data[0] = speed == 0 ? 0x05 : 0x06;
rep_data[1] = 0x00;
ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
rep_data, 2, 3);
if (ret >= 0) {
wacom->wacom_wac.bt_high_speed = speed;
return 0;
}
}
/*
* Note that if the raw queries fail, it's not a hard failure
* and it is safe to continue
*/
hid_warn(hdev, "failed to poke device, command %d, err %d\n",
rep_data[0], ret);
break;
case INTUOS4WL:
if (speed == 1)
wacom->wacom_wac.bt_features &= ~0x20;
else
wacom->wacom_wac.bt_features |= 0x20;
rep_data[0] = 0x03;
rep_data[1] = wacom->wacom_wac.bt_features;
ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
1);
if (ret >= 0)
wacom->wacom_wac.bt_high_speed = speed;
break;
}
return 0;
}
/*
* Switch the tablet into its most-capable mode. Wacom tablets are
* typically configured to power-up in a mode which sends mouse-like
* reports to the OS. To get absolute position, pressure data, etc.
* from the tablet, it is necessary to switch the tablet out of this
* mode and into one which sends the full range of tablet data.
*/
static int wacom_query_tablet_data(struct hid_device *hdev,
struct wacom_features *features)
{
if (hdev->bus == BUS_BLUETOOTH)
return wacom_bt_query_tablet_data(hdev, 1, features);
if (features->type == HID_GENERIC)
return wacom_hid_set_device_mode(hdev);
if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
if (features->type > TABLETPC) {
/* MT Tablet PC touch */
return wacom_set_device_mode(hdev, 3, 4, 4);
}
else if (features->type == WACOM_24HDT || features->type == CINTIQ_HYBRID) {
return wacom_set_device_mode(hdev, 18, 3, 2);
}
else if (features->type == WACOM_27QHDT) {
return wacom_set_device_mode(hdev, 131, 3, 2);
}
else if (features->type == BAMBOO_PAD) {
return wacom_set_device_mode(hdev, 2, 2, 2);
}
} else if (features->device_type & WACOM_DEVICETYPE_PEN) {
if (features->type <= BAMBOO_PT && features->type != WIRELESS) {
return wacom_set_device_mode(hdev, 2, 2, 2);
}
}
return 0;
}
static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
struct wacom_features *features)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct usb_interface *intf = wacom->intf;
/* default features */
features->x_fuzz = 4;
features->y_fuzz = 4;
features->pressure_fuzz = 0;
features->distance_fuzz = 0;
/*
* The wireless device HID is basic and layout conflicts with
* other tablets (monitor and touch interface can look like pen).
* Skip the query for this type and modify defaults based on
* interface number.
*/
if (features->type == WIRELESS) {
if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
else
features->device_type = WACOM_DEVICETYPE_NONE;
return;
}
wacom_parse_hid(hdev, features);
}
struct wacom_hdev_data {
struct list_head list;
struct kref kref;
struct hid_device *dev;
struct wacom_shared shared;
};
static LIST_HEAD(wacom_udev_list);
static DEFINE_MUTEX(wacom_udev_list_lock);
static bool wacom_are_sibling(struct hid_device *hdev,
struct hid_device *sibling)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
int vid = features->oVid;
int pid = features->oPid;
int n1,n2;
if (vid == 0 && pid == 0) {
vid = hdev->vendor;
pid = hdev->product;
}
if (vid != sibling->vendor || pid != sibling->product)
return false;
/* Compare the physical path. */
n1 = strrchr(hdev->phys, '.') - hdev->phys;
n2 = strrchr(sibling->phys, '.') - sibling->phys;
if (n1 != n2 || n1 <= 0 || n2 <= 0)
return false;
return !strncmp(hdev->phys, sibling->phys, n1);
}
static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
{
struct wacom_hdev_data *data;
list_for_each_entry(data, &wacom_udev_list, list) {
if (wacom_are_sibling(hdev, data->dev)) {
kref_get(&data->kref);
return data;
}
}
return NULL;
}
static int wacom_add_shared_data(struct hid_device *hdev)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct wacom_hdev_data *data;
int retval = 0;
mutex_lock(&wacom_udev_list_lock);
data = wacom_get_hdev_data(hdev);
if (!data) {
data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
if (!data) {
retval = -ENOMEM;
goto out;
}
kref_init(&data->kref);
data->dev = hdev;
list_add_tail(&data->list, &wacom_udev_list);
}
wacom_wac->shared = &data->shared;
if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
wacom_wac->shared->touch = hdev;
else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
wacom_wac->shared->pen = hdev;
out:
mutex_unlock(&wacom_udev_list_lock);
return retval;
}
static void wacom_release_shared_data(struct kref *kref)
{
struct wacom_hdev_data *data =
container_of(kref, struct wacom_hdev_data, kref);
mutex_lock(&wacom_udev_list_lock);
list_del(&data->list);
mutex_unlock(&wacom_udev_list_lock);
kfree(data);
}
static void wacom_remove_shared_data(struct wacom *wacom)
{
struct wacom_hdev_data *data;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
if (wacom_wac->shared) {
data = container_of(wacom_wac->shared, struct wacom_hdev_data,
shared);
if (wacom_wac->shared->touch == wacom->hdev)
wacom_wac->shared->touch = NULL;
else if (wacom_wac->shared->pen == wacom->hdev)
wacom_wac->shared->pen = NULL;
kref_put(&data->kref, wacom_release_shared_data);
wacom_wac->shared = NULL;
}
}
static int wacom_led_control(struct wacom *wacom)
{
unsigned char *buf;
int retval;
unsigned char report_id = WAC_CMD_LED_CONTROL;
int buf_size = 9;
if (wacom->wacom_wac.pid) { /* wireless connected */
report_id = WAC_CMD_WL_LED_CONTROL;
buf_size = 13;
}
buf = kzalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (wacom->wacom_wac.features.type >= INTUOS5S &&
wacom->wacom_wac.features.type <= INTUOSPL) {
/*
* Touch Ring and crop mark LED luminance may take on
* one of four values:
* 0 = Low; 1 = Medium; 2 = High; 3 = Off
*/
int ring_led = wacom->led.select[0] & 0x03;
int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
int crop_lum = 0;
unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
buf[0] = report_id;
if (wacom->wacom_wac.pid) {
wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
buf, buf_size, WAC_CMD_RETRIES);
buf[0] = report_id;
buf[4] = led_bits;
} else
buf[1] = led_bits;
}
else {
int led = wacom->led.select[0] | 0x4;
if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
wacom->wacom_wac.features.type == WACOM_24HD)
led |= (wacom->led.select[1] << 4) | 0x40;
buf[0] = report_id;
buf[1] = led;
buf[2] = wacom->led.llv;
buf[3] = wacom->led.hlv;
buf[4] = wacom->led.img_lum;
}
retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
WAC_CMD_RETRIES);
kfree(buf);
return retval;
}
static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
const unsigned len, const void *img)
{
unsigned char *buf;
int i, retval;
const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* Send 'start' command */
buf[0] = WAC_CMD_ICON_START;
buf[1] = 1;
retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
WAC_CMD_RETRIES);
if (retval < 0)
goto out;
buf[0] = xfer_id;
buf[1] = button_id & 0x07;
for (i = 0; i < 4; i++) {
buf[2] = i;
memcpy(buf + 3, img + i * chunk_len, chunk_len);
retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
buf, chunk_len + 3, WAC_CMD_RETRIES);
if (retval < 0)
break;
}
/* Send 'stop' */
buf[0] = WAC_CMD_ICON_START;
buf[1] = 0;
wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
WAC_CMD_RETRIES);
out:
kfree(buf);
return retval;
}
static ssize_t wacom_led_select_store(struct device *dev, int set_id,
const char *buf, size_t count)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct wacom *wacom = hid_get_drvdata(hdev);
unsigned int id;
int err;
err = kstrtouint(buf, 10, &id);
if (err)
return err;
mutex_lock(&wacom->lock);
wacom->led.select[set_id] = id & 0x3;
err = wacom_led_control(wacom);
mutex_unlock(&wacom->lock);
return err < 0 ? err : count;
}
#define DEVICE_LED_SELECT_ATTR(SET_ID) \
static ssize_t wacom_led##SET_ID##_select_store(struct device *dev, \
struct device_attribute *attr, const char *buf, size_t count) \
{ \
return wacom_led_select_store(dev, SET_ID, buf, count); \
} \
static ssize_t wacom_led##SET_ID##_select_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct hid_device *hdev = container_of(dev, struct hid_device, dev);\
struct wacom *wacom = hid_get_drvdata(hdev); \
return scnprintf(buf, PAGE_SIZE, "%d\n", \
wacom->led.select[SET_ID]); \
} \
static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM, \
wacom_led##SET_ID##_select_show, \
wacom_led##SET_ID##_select_store)
DEVICE_LED_SELECT_ATTR(0);
DEVICE_LED_SELECT_ATTR(1);
static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
const char *buf, size_t count)
{
unsigned int value;
int err;
err = kstrtouint(buf, 10, &value);
if (err)
return err;
mutex_lock(&wacom->lock);
*dest = value & 0x7f;
err = wacom_led_control(wacom);
mutex_unlock(&wacom->lock);
return err < 0 ? err : count;
}
#define DEVICE_LUMINANCE_ATTR(name, field) \
static ssize_t wacom_##name##_luminance_store(struct device *dev, \
struct device_attribute *attr, const char *buf, size_t count) \
{ \
struct hid_device *hdev = container_of(dev, struct hid_device, dev);\
struct wacom *wacom = hid_get_drvdata(hdev); \
\
return wacom_luminance_store(wacom, &wacom->led.field, \
buf, count); \
} \
static ssize_t wacom_##name##_luminance_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct wacom *wacom = dev_get_drvdata(dev); \
return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field); \
} \
static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM, \
wacom_##name##_luminance_show, \
wacom_##name##_luminance_store)
DEVICE_LUMINANCE_ATTR(status0, llv);
DEVICE_LUMINANCE_ATTR(status1, hlv);
DEVICE_LUMINANCE_ATTR(buttons, img_lum);
static ssize_t wacom_button_image_store(struct device *dev, int button_id,
const char *buf, size_t count)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct wacom *wacom = hid_get_drvdata(hdev);
int err;
unsigned len;
u8 xfer_id;
if (hdev->bus == BUS_BLUETOOTH) {
len = 256;
xfer_id = WAC_CMD_ICON_BT_XFER;
} else {
len = 1024;
xfer_id = WAC_CMD_ICON_XFER;
}
if (count != len)
return -EINVAL;
mutex_lock(&wacom->lock);
err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
mutex_unlock(&wacom->lock);
return err < 0 ? err : count;
}
#define DEVICE_BTNIMG_ATTR(BUTTON_ID) \
static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev, \
struct device_attribute *attr, const char *buf, size_t count) \
{ \
return wacom_button_image_store(dev, BUTTON_ID, buf, count); \
} \
static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM, \
NULL, wacom_btnimg##BUTTON_ID##_store)
DEVICE_BTNIMG_ATTR(0);
DEVICE_BTNIMG_ATTR(1);
DEVICE_BTNIMG_ATTR(2);
DEVICE_BTNIMG_ATTR(3);
DEVICE_BTNIMG_ATTR(4);
DEVICE_BTNIMG_ATTR(5);
DEVICE_BTNIMG_ATTR(6);
DEVICE_BTNIMG_ATTR(7);
static struct attribute *cintiq_led_attrs[] = {
&dev_attr_status_led0_select.attr,
&dev_attr_status_led1_select.attr,
NULL
};
static struct attribute_group cintiq_led_attr_group = {
.name = "wacom_led",
.attrs = cintiq_led_attrs,
};
static struct attribute *intuos4_led_attrs[] = {
&dev_attr_status0_luminance.attr,
&dev_attr_status1_luminance.attr,
&dev_attr_status_led0_select.attr,
&dev_attr_buttons_luminance.attr,
&dev_attr_button0_rawimg.attr,
&dev_attr_button1_rawimg.attr,
&dev_attr_button2_rawimg.attr,
&dev_attr_button3_rawimg.attr,
&dev_attr_button4_rawimg.attr,
&dev_attr_button5_rawimg.attr,
&dev_attr_button6_rawimg.attr,
&dev_attr_button7_rawimg.attr,
NULL
};
static struct attribute_group intuos4_led_attr_group = {
.name = "wacom_led",
.attrs = intuos4_led_attrs,
};
static struct attribute *intuos5_led_attrs[] = {
&dev_attr_status0_luminance.attr,
&dev_attr_status_led0_select.attr,
NULL
};
static struct attribute_group intuos5_led_attr_group = {
.name = "wacom_led",
.attrs = intuos5_led_attrs,
};
static int wacom_initialize_leds(struct wacom *wacom)
{
int error;
if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
return 0;
/* Initialize default values */
switch (wacom->wacom_wac.features.type) {
case INTUOS4S:
case INTUOS4:
case INTUOS4WL:
case INTUOS4L:
wacom->led.select[0] = 0;
wacom->led.select[1] = 0;
wacom->led.llv = 10;
wacom->led.hlv = 20;
wacom->led.img_lum = 10;
error = sysfs_create_group(&wacom->hdev->dev.kobj,
&intuos4_led_attr_group);
break;
case WACOM_24HD:
case WACOM_21UX2:
wacom->led.select[0] = 0;
wacom->led.select[1] = 0;
wacom->led.llv = 0;
wacom->led.hlv = 0;
wacom->led.img_lum = 0;
error = sysfs_create_group(&wacom->hdev->dev.kobj,
&cintiq_led_attr_group);
break;
case INTUOS5S:
case INTUOS5:
case INTUOS5L:
case INTUOSPS:
case INTUOSPM:
case INTUOSPL:
wacom->led.select[0] = 0;
wacom->led.select[1] = 0;
wacom->led.llv = 32;
wacom->led.hlv = 0;
wacom->led.img_lum = 0;
error = sysfs_create_group(&wacom->hdev->dev.kobj,
&intuos5_led_attr_group);
break;
default:
return 0;
}
if (error) {
hid_err(wacom->hdev,
"cannot create sysfs group err: %d\n", error);
return error;
}
wacom_led_control(wacom);
wacom->led_initialized = true;
return 0;
}
static void wacom_destroy_leds(struct wacom *wacom)
{
if (!wacom->led_initialized)
return;
if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
return;
wacom->led_initialized = false;
switch (wacom->wacom_wac.features.type) {
case INTUOS4S:
case INTUOS4:
case INTUOS4WL:
case INTUOS4L:
sysfs_remove_group(&wacom->hdev->dev.kobj,
&intuos4_led_attr_group);
break;
case WACOM_24HD:
case WACOM_21UX2:
sysfs_remove_group(&wacom->hdev->dev.kobj,
&cintiq_led_attr_group);
break;
case INTUOS5S:
case INTUOS5:
case INTUOS5L:
case INTUOSPS:
case INTUOSPM:
case INTUOSPL:
sysfs_remove_group(&wacom->hdev->dev.kobj,
&intuos5_led_attr_group);
break;
}
}
static enum power_supply_property wacom_battery_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_SCOPE,
POWER_SUPPLY_PROP_CAPACITY
};
static enum power_supply_property wacom_ac_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_SCOPE,
};
static int wacom_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
struct wacom *wacom = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
val->intval = wacom->wacom_wac.bat_connected;
break;
case POWER_SUPPLY_PROP_SCOPE:
val->intval = POWER_SUPPLY_SCOPE_DEVICE;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval =
wacom->wacom_wac.battery_capacity;
break;
case POWER_SUPPLY_PROP_STATUS:
if (wacom->wacom_wac.bat_charging)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (wacom->wacom_wac.battery_capacity == 100 &&
wacom->wacom_wac.ps_connected)
val->intval = POWER_SUPPLY_STATUS_FULL;
else if (wacom->wacom_wac.ps_connected)
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int wacom_ac_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
struct wacom *wacom = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
/* fall through */
case POWER_SUPPLY_PROP_ONLINE:
val->intval = wacom->wacom_wac.ps_connected;
break;
case POWER_SUPPLY_PROP_SCOPE:
val->intval = POWER_SUPPLY_SCOPE_DEVICE;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int wacom_initialize_battery(struct wacom *wacom)
{
static atomic_t battery_no = ATOMIC_INIT(0);
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
struct power_supply_config psy_cfg = { .drv_data = wacom, };
unsigned long n;
if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) {
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
struct power_supply_desc *bat_desc = &wacom->battery_desc;
struct power_supply_desc *ac_desc = &wacom->ac_desc;
n = atomic_inc_return(&battery_no) - 1;
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
bat_desc->properties = wacom_battery_props;
bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
bat_desc->get_property = wacom_battery_get_property;
sprintf(wacom->wacom_wac.bat_name, "wacom_battery_%ld", n);
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
bat_desc->name = wacom->wacom_wac.bat_name;
bat_desc->type = POWER_SUPPLY_TYPE_BATTERY;
bat_desc->use_for_apm = 0;
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
ac_desc->properties = wacom_ac_props;
ac_desc->num_properties = ARRAY_SIZE(wacom_ac_props);
ac_desc->get_property = wacom_ac_get_property;
sprintf(wacom->wacom_wac.ac_name, "wacom_ac_%ld", n);
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
ac_desc->name = wacom->wacom_wac.ac_name;
ac_desc->type = POWER_SUPPLY_TYPE_MAINS;
ac_desc->use_for_apm = 0;
wacom->battery = power_supply_register(&wacom->hdev->dev,
&wacom->battery_desc, &psy_cfg);
if (IS_ERR(wacom->battery))
return PTR_ERR(wacom->battery);
power_supply_powers(wacom->battery, &wacom->hdev->dev);
wacom->ac = power_supply_register(&wacom->hdev->dev,
&wacom->ac_desc,
&psy_cfg);
if (IS_ERR(wacom->ac)) {
power_supply_unregister(wacom->battery);
return PTR_ERR(wacom->ac);
}
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
power_supply_powers(wacom->ac, &wacom->hdev->dev);
}
return 0;
}
static void wacom_destroy_battery(struct wacom *wacom)
{
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid Pull HID updates from Jiri Kosina: - quite a few firmware fixes for RMI driver by Andrew Duggan - huion and uclogic drivers have been substantially overlaping in functionality laterly. This redundancy is fixed by hid-huion driver being merged into hid-uclogic; work done by Benjamin Tissoires and Nikolai Kondrashov - i2c-hid now supports ACPI GPIO interrupts; patch from Mika Westerberg - Some of the quirks, that got separated into individual drivers, have historically had EXPERT dependency. As HID subsystem matured (as well as the individual drivers), this made less and less sense. This dependency is now being removed by patch from Jean Delvare - Logitech lg4ff driver received a couple of improvements for mode switching, by Michal Malý - multitouch driver now supports clickpads, patches by Benjamin Tissoires and Seth Forshee - hid-sensor framework received a substantial update; namely support for Custom and Generic pages is being added; work done by Srinivas Pandruvada - wacom driver received substantial update; it now supports i2c-conntected devices (Mika Westerberg), Bamboo PADs are now properly supported (Benjamin Tissoires), much improved battery reporting (Jason Gerecke) and pen proximity cleanups (Ping Cheng) - small assorted fixes and device ID additions * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (68 commits) HID: sensor: Update document for custom sensor HID: sensor: Custom and Generic sensor support HID: debug: fix error handling in hid_debug_events_read() Input - mt: Fix input_mt_get_slot_by_key HID: logitech-hidpp: fix error return code HID: wacom: Add support for Cintiq 13HD Touch HID: logitech-hidpp: add a module parameter to keep firmware gestures HID: usbhid: yet another mouse with ALWAYS_POLL HID: usbhid: more mice with ALWAYS_POLL HID: wacom: set stylus_in_proximity before checking touch_down HID: wacom: use wacom_wac_finger_count_touches to set touch_down HID: wacom: remove hardcoded WACOM_QUIRK_MULTI_INPUT HID: pidff: effect can't be NULL HID: add quirk for PIXART OEM mouse used by HP HID: add HP OEM mouse to quirk ALWAYS_POLL HID: wacom: ask for a in-prox report when it was missed HID: hid-sensor-hub: Fix sparse warning HID: hid-sensor-hub: fix attribute read for logical usage id HID: plantronics: fix Kconfig default HID: pidff: support more than one concurrent effect ...
2015-04-14 09:25:26 -07:00
if (wacom->battery) {
power_supply: Change ownership from driver to core Change the ownership of power_supply structure from each driver implementing the class to the power supply core. The patch changes power_supply_register() function thus all drivers implementing power supply class are adjusted. Each driver provides the implementation of power supply. However it should not be the owner of power supply class instance because it is exposed by core to other subsystems with power_supply_get_by_name(). These other subsystems have no knowledge when the driver will unregister the power supply. This leads to several issues when driver is unbound - mostly because user of power supply accesses freed memory. Instead let the core own the instance of struct 'power_supply'. Other users of this power supply will still access valid memory because it will be freed when device reference count reaches 0. Currently this means "it will leak" but power_supply_put() call in next patches will solve it. This solves invalid memory references in following race condition scenario: Thread 1: charger manager Thread 2: power supply driver, used by charger manager THREAD 1 (charger manager) THREAD 2 (power supply driver) ========================== ============================== psy = power_supply_get_by_name() Driver unbind, .remove power_supply_unregister() Device fully removed psy->get_property() The 'get_property' call is executed in invalid context because the driver was unbound and struct 'power_supply' memory was freed. This could be observed easily with charger manager driver (here compiled with max17040 fuel gauge): $ cat /sys/devices/virtual/power_supply/cm-battery/capacity & $ echo "1-0036" > /sys/bus/i2c/drivers/max17040/unbind [ 55.725123] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 55.732584] pgd = d98d4000 [ 55.734060] [00000000] *pgd=5afa2831, *pte=00000000, *ppte=00000000 [ 55.740318] Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM [ 55.746210] Modules linked in: [ 55.749259] CPU: 1 PID: 2936 Comm: cat Tainted: G W 3.19.0-rc1-next-20141226-00048-gf79f475f3c44-dirty #1496 [ 55.760190] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 55.766270] task: d9b76f00 ti: daf54000 task.ti: daf54000 [ 55.771647] PC is at 0x0 [ 55.774182] LR is at charger_get_property+0x2f4/0x36c [ 55.779201] pc : [<00000000>] lr : [<c034b0b4>] psr: 60000013 [ 55.779201] sp : daf55e90 ip : 00000003 fp : 00000000 [ 55.790657] r10: 00000000 r9 : c06e2878 r8 : d9b26c68 [ 55.795865] r7 : dad81610 r6 : daec7410 r5 : daf55ebc r4 : 00000000 [ 55.802367] r3 : 00000000 r2 : daf55ebc r1 : 0000002a r0 : d9b26c68 [ 55.808879] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 55.815994] Control: 10c5387d Table: 598d406a DAC: 00000015 [ 55.821723] Process cat (pid: 2936, stack limit = 0xdaf54210) [ 55.827451] Stack: (0xdaf55e90 to 0xdaf56000) [ 55.831795] 5e80: 60000013 c01459c4 0000002a c06f8ef8 [ 55.839956] 5ea0: db651000 c06f8ef8 daebac00 c04cb668 daebac08 c0346864 00000000 c01459c4 [ 55.848115] 5ec0: d99eaa80 c06f8ef8 00000fff 00001000 db651000 c027f25c c027f240 d99eaa80 [ 55.856274] 5ee0: d9a06c00 c0146218 daf55f18 00001000 d99eaa80 db4c18c0 00000001 00000001 [ 55.864468] 5f00: daf55f80 c0144c78 c0144c54 c0107f90 00015000 d99eaab0 00000000 00000000 [ 55.872603] 5f20: 000051c7 00000000 db4c18c0 c04a9370 00015000 00001000 daf55f80 00001000 [ 55.880763] 5f40: daf54000 00015000 00000000 c00e53dc db4c18c0 c00e548c 0000000d 00008124 [ 55.888937] 5f60: 00000001 00000000 00000000 db4c18c0 db4c18c0 00001000 00015000 c00e5550 [ 55.897099] 5f80: 00000000 00000000 00001000 00001000 00015000 00000003 00000003 c000f364 [ 55.905239] 5fa0: 00000000 c000f1a0 00001000 00015000 00000003 00015000 00001000 0001333c [ 55.913399] 5fc0: 00001000 00015000 00000003 00000003 00000002 00000000 00000000 00000000 [ 55.921560] 5fe0: 7fffe000 be999850 0000a225 b6f3c19c 60000010 00000003 00000000 00000000 [ 55.929744] [<c034b0b4>] (charger_get_property) from [<c0346864>] (power_supply_show_property+0x48/0x20c) [ 55.939286] [<c0346864>] (power_supply_show_property) from [<c027f25c>] (dev_attr_show+0x1c/0x48) [ 55.948130] [<c027f25c>] (dev_attr_show) from [<c0146218>] (sysfs_kf_seq_show+0x84/0x104) [ 55.956298] [<c0146218>] (sysfs_kf_seq_show) from [<c0144c78>] (kernfs_seq_show+0x24/0x28) [ 55.964536] [<c0144c78>] (kernfs_seq_show) from [<c0107f90>] (seq_read+0x1b0/0x484) [ 55.972172] [<c0107f90>] (seq_read) from [<c00e53dc>] (__vfs_read+0x18/0x4c) [ 55.979188] [<c00e53dc>] (__vfs_read) from [<c00e548c>] (vfs_read+0x7c/0x100) [ 55.986304] [<c00e548c>] (vfs_read) from [<c00e5550>] (SyS_read+0x40/0x8c) [ 55.993164] [<c00e5550>] (SyS_read) from [<c000f1a0>] (ret_fast_syscall+0x0/0x48) [ 56.000626] Code: bad PC value [ 56.011652] ---[ end trace 7b64343fbdae8ef1 ]--- Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> [for the nvec part] Reviewed-by: Marc Dietrich <marvin24@gmx.de> [for compal-laptop.c] Acked-by: Darren Hart <dvhart@linux.intel.com> [for the mfd part] Acked-by: Lee Jones <lee.jones@linaro.org> [for the hid part] Acked-by: Jiri Kosina <jkosina@suse.cz> [for the acpi part] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-03-12 00:44:11 -07:00
power_supply_unregister(wacom->battery);
wacom->battery = NULL;
power_supply_unregister(wacom->ac);
wacom->ac = NULL;
}
}
static ssize_t wacom_show_speed(struct device *dev,
struct device_attribute
*attr, char *buf)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct wacom *wacom = hid_get_drvdata(hdev);
return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
}
static ssize_t wacom_store_speed(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct wacom *wacom = hid_get_drvdata(hdev);
u8 new_speed;
if (kstrtou8(buf, 0, &new_speed))
return -EINVAL;
if (new_speed != 0 && new_speed != 1)
return -EINVAL;
wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
return count;
}
static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
wacom_show_speed, wacom_store_speed);
static ssize_t wacom_show_remote_mode(struct kobject *kobj,
struct kobj_attribute *kattr,
char *buf, int index)
{
struct device *dev = container_of(kobj->parent, struct device, kobj);
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct wacom *wacom = hid_get_drvdata(hdev);
u8 mode;
mode = wacom->led.select[index];
if (mode >= 0 && mode < 3)
return snprintf(buf, PAGE_SIZE, "%d\n", mode);
else
return snprintf(buf, PAGE_SIZE, "%d\n", -1);
}
#define DEVICE_EKR_ATTR_GROUP(SET_ID) \
static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj, \
struct kobj_attribute *kattr, char *buf) \
{ \
return wacom_show_remote_mode(kobj, kattr, buf, SET_ID); \
} \
static struct kobj_attribute remote##SET_ID##_mode_attr = { \
.attr = {.name = "remote_mode", \
.mode = DEV_ATTR_RO_PERM}, \
.show = wacom_show_remote##SET_ID##_mode, \
}; \
static struct attribute *remote##SET_ID##_serial_attrs[] = { \
&remote##SET_ID##_mode_attr.attr, \
NULL \
}; \
static struct attribute_group remote##SET_ID##_serial_group = { \
.name = NULL, \
.attrs = remote##SET_ID##_serial_attrs, \
}
DEVICE_EKR_ATTR_GROUP(0);
DEVICE_EKR_ATTR_GROUP(1);
DEVICE_EKR_ATTR_GROUP(2);
DEVICE_EKR_ATTR_GROUP(3);
DEVICE_EKR_ATTR_GROUP(4);
int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial, int index)
{
int error = 0;
char *buf;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
wacom_wac->serial[index] = serial;
buf = kzalloc(WAC_REMOTE_SERIAL_MAX_STRLEN, GFP_KERNEL);
if (!buf)
return -ENOMEM;
snprintf(buf, WAC_REMOTE_SERIAL_MAX_STRLEN, "%d", serial);
wacom->remote_group[index].name = buf;
error = sysfs_create_group(wacom->remote_dir,
&wacom->remote_group[index]);
if (error) {
hid_err(wacom->hdev,
"cannot create sysfs group err: %d\n", error);
kobject_put(wacom->remote_dir);
return error;
}
return 0;
}
void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial)
{
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
int i;
if (!serial)
return;
for (i = 0; i < WACOM_MAX_REMOTES; i++) {
if (wacom_wac->serial[i] == serial) {
wacom_wac->serial[i] = 0;
wacom->led.select[i] = WACOM_STATUS_UNKNOWN;
if (wacom->remote_group[i].name) {
sysfs_remove_group(wacom->remote_dir,
&wacom->remote_group[i]);
kfree(wacom->remote_group[i].name);
wacom->remote_group[i].name = NULL;
}
}
}
}
static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
{
const size_t buf_size = 2;
unsigned char *buf;
int retval;
buf = kzalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[0] = WAC_CMD_DELETE_PAIRING;
buf[1] = selector;
retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
buf_size, WAC_CMD_RETRIES);
kfree(buf);
return retval;
}
static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
unsigned char selector = 0;
struct device *dev = container_of(kobj->parent, struct device, kobj);
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
struct wacom *wacom = hid_get_drvdata(hdev);
int err;
if (!strncmp(buf, "*\n", 2)) {
selector = WAC_CMD_UNPAIR_ALL;
} else {
hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
buf);
return -1;
}
mutex_lock(&wacom->lock);
err = wacom_cmd_unpair_remote(wacom, selector);
mutex_unlock(&wacom->lock);
return err < 0 ? err : count;
}
static struct kobj_attribute unpair_remote_attr = {
.attr = {.name = "unpair_remote", .mode = 0200},
.store = wacom_store_unpair_remote,
};
static const struct attribute *remote_unpair_attrs[] = {
&unpair_remote_attr.attr,
NULL
};
static int wacom_initialize_remote(struct wacom *wacom)
{
int error = 0;
struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
int i;
if (wacom->wacom_wac.features.type != REMOTE)
return 0;
wacom->remote_group[0] = remote0_serial_group;
wacom->remote_group[1] = remote1_serial_group;
wacom->remote_group[2] = remote2_serial_group;
wacom->remote_group[3] = remote3_serial_group;
wacom->remote_group[4] = remote4_serial_group;
wacom->remote_dir = kobject_create_and_add("wacom_remote",
&wacom->hdev->dev.kobj);
if (!wacom->remote_dir)
return -ENOMEM;
error = sysfs_create_files(wacom->remote_dir, remote_unpair_attrs);
if (error) {
hid_err(wacom->hdev,
"cannot create sysfs group err: %d\n", error);
return error;
}
for (i = 0; i < WACOM_MAX_REMOTES; i++) {
wacom->led.select[i] = WACOM_STATUS_UNKNOWN;
wacom_wac->serial[i] = 0;
}
return 0;
}
Input: wacom - create a separate input device for pads Currently, the pad events are sent through the stylus input device for the Intuos/Cintiqs, and through the touch input device for the Bamboos. To differentiate the buttons pressed on the pad from the ones pressed on the stylus, the Intuos/Cintiq uses MISC_SERIAL and ABS_MISC. This lead to a multiplexing of the events into one device, which are then splitted out in xf86-input-wacom. Bamboos are not using MISC events because the pad is attached to the touch interface, and only BTN_TOUCH is used for the finger (and DOUBLE_TAP, etc...). However, the user space driver still splits out the pad from the touch interface in the same way it does for the pro line devices. The other problem we can see with this fact is that some of the Intuos and Cintiq have a wheel, and the effective range of the reported values is [0..71]. Unfortunately, the airbrush stylus also sends wheel events (there is a small wheel on it), but in the range [0..1023]. From the user space point of view it is kind of difficult to understand that because the wheel on the pad are quite common, while the airbrush tool is not. A solution to fix all of these problems is to split out the pad device from the stylus/touch. This decision makes more sense because the pad is not linked to the absolute position of the finger or pen, and usually, the events from the pad are filtered out by the compositor, which then convert them into actions or keyboard shortcuts. For backward compatibility with current xf86-input-wacom, the pad devices still present the ABS_X, ABS_Y and ABS_MISC events, but they can be completely ignored in the new implementation. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Ping Cheng <pingc@wacom.com> Reviewed-by: Jason Gerecke <killertofu@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-07-24 12:48:28 -07:00
static struct input_dev *wacom_allocate_input(struct wacom *wacom)
{
struct input_dev *input_dev;
struct hid_device *hdev = wacom->hdev;
struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
input_dev = input_allocate_device();
Input: wacom - create a separate input device for pads Currently, the pad events are sent through the stylus input device for the Intuos/Cintiqs, and through the touch input device for the Bamboos. To differentiate the buttons pressed on the pad from the ones pressed on the stylus, the Intuos/Cintiq uses MISC_SERIAL and ABS_MISC. This lead to a multiplexing of the events into one device, which are then splitted out in xf86-input-wacom. Bamboos are not using MISC events because the pad is attached to the touch interface, and only BTN_TOUCH is used for the finger (and DOUBLE_TAP, etc...). However, the user space driver still splits out the pad from the touch interface in the same way it does for the pro line devices. The other problem we can see with this fact is that some of the Intuos and Cintiq have a wheel, and the effective range of the reported values is [0..71]. Unfortunately, the airbrush stylus also sends wheel events (there is a small wheel on it), but in the range [0..1023]. From the user space point of view it is kind of difficult to understand that because the wheel on the pad are quite common, while the airbrush tool is not. A solution to fix all of these problems is to split out the pad device from the stylus/touch. This decision makes more sense because the pad is not linked to the absolute position of the finger or pen, and usually, the events from the pad are filtered out by the compositor, which then convert them into actions or keyboard shortcuts. For backward compatibility with current xf86-input-wacom, the pad devices still present the ABS_X, ABS_Y and ABS_MISC events, but they can be completely ignored in the new implementation. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Ping Cheng <pingc@wacom.com> Reviewed-by: Jason Gerecke <killertofu@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-07-24 12:48:28 -07:00
if (!input_dev)
return NULL;
input_dev->name = wacom_wac->features.name;
input_dev->phys = hdev->phys;
input_dev->dev.parent = &hdev->dev;
input_dev->open = wacom_open;
input_dev->close = wacom_close;
input_dev->uniq = hdev->uniq;
input_dev->id.bustype = hdev->bus;
input_dev->id.vendor = hdev->vendor;
input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
input_dev->id.version = hdev->version;
input_set_drvdata(input_dev, wacom);
Input: wacom - create a separate input device for pads Currently, the pad events are sent through the stylus input device for the Intuos/Cintiqs, and through the touch input device for the Bamboos. To differentiate the buttons pressed on the pad from the ones pressed on the stylus, the Intuos/Cintiq uses MISC_SERIAL and ABS_MISC. This lead to a multiplexing of the events into one device, which are then splitted out in xf86-input-wacom. Bamboos are not using MISC events because the pad is attached to the touch interface, and only BTN_TOUCH is used for the finger (and DOUBLE_TAP, etc...). However, the user space driver still splits out the pad from the touch interface in the same way it does for the pro line devices. The other problem we can see with this fact is that some of the Intuos and Cintiq have a wheel, and the effective range of the reported values is [0..71]. Unfortunately, the airbrush stylus also sends wheel events (there is a small wheel on it), but in the range [0..1023]. From the user space point of view it is kind of difficult to understand that because the wheel on the pad are quite common, while the airbrush tool is not. A solution to fix all of these problems is to split out the pad device from the stylus/touch. This decision makes more sense because the pad is not linked to the absolute position of the finger or pen, and usually, the events from the pad are filtered out by the compositor, which then convert them into actions or keyboard shortcuts. For backward compatibility with current xf86-input-wacom, the pad devices still present the ABS_X, ABS_Y and ABS_MISC events, but they can be completely ignored in the new implementation. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Ping Cheng <pingc@wacom.com> Reviewed-by: Jason Gerecke <killertofu@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-07-24 12:48:28 -07:00
return input_dev;
}
static void wacom_clean_inputs(struct wacom *wacom)
{
if (wacom->wacom_wac.pen_input) {
if (wacom->wacom_wac.pen_registered)
input_unregister_device(wacom->wacom_wac.pen_input);
else
input_free_device(wacom->wacom_wac.pen_input);
}
if (wacom->wacom_wac.touch_input) {
if (wacom->wacom_wac.touch_registered)
input_unregister_device(wacom->wacom_wac.touch_input);
else
input_free_device(wacom->wacom_wac.touch_input);
}
if (wacom->wacom_wac.pad_input) {
if (wacom->wacom_wac.pad_registered)
input_unregister_device(wacom->wacom_wac.pad_input);
else
input_free_device(wacom->wacom_wac.pad_input);
}
if (wacom->remote_dir)
kobject_put(wacom->remote_dir);
wacom->wacom_wac.pen_input = NULL;
wacom->wacom_wac.touch_input = NULL;
wacom->wacom_wac.pad_input = NULL;
wacom_destroy_leds(wacom);
}
static int wacom_allocate_inputs(struct wacom *wacom)
{
struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
wacom_wac->pen_input = wacom_allocate_input(wacom);
wacom_wac->touch_input = wacom_allocate_input(wacom);
wacom_wac->pad_input = wacom_allocate_input(wacom);
if (!wacom_wac->pen_input || !wacom_wac->touch_input || !wacom_wac->pad_input) {
wacom_clean_inputs(wacom);
return -ENOMEM;
}
wacom_wac->pen_input->name = wacom_wac->pen_name;
wacom_wac->touch_input->name = wacom_wac->touch_name;
wacom_wac->pad_input->name = wacom_wac->pad_name;
return 0;
}
static int wacom_register_inputs(struct wacom *wacom)
{
struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
int error = 0;
pen_input_dev = wacom_wac->pen_input;
touch_input_dev = wacom_wac->touch_input;
pad_input_dev = wacom_wac->pad_input;
if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
return -EINVAL;
error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
if (error) {
/* no pen in use on this interface */
input_free_device(pen_input_dev);
wacom_wac->pen_input = NULL;
pen_input_dev = NULL;
} else {
error = input_register_device(pen_input_dev);
if (error)
goto fail_register_pen_input;
wacom_wac->pen_registered = true;
}
error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
if (error) {
/* no touch in use on this interface */
input_free_device(touch_input_dev);
wacom_wac->touch_input = NULL;
touch_input_dev = NULL;
} else {
error = input_register_device(touch_input_dev);
if (error)
goto fail_register_touch_input;
wacom_wac->touch_registered = true;
}
Input: wacom - create a separate input device for pads Currently, the pad events are sent through the stylus input device for the Intuos/Cintiqs, and through the touch input device for the Bamboos. To differentiate the buttons pressed on the pad from the ones pressed on the stylus, the Intuos/Cintiq uses MISC_SERIAL and ABS_MISC. This lead to a multiplexing of the events into one device, which are then splitted out in xf86-input-wacom. Bamboos are not using MISC events because the pad is attached to the touch interface, and only BTN_TOUCH is used for the finger (and DOUBLE_TAP, etc...). However, the user space driver still splits out the pad from the touch interface in the same way it does for the pro line devices. The other problem we can see with this fact is that some of the Intuos and Cintiq have a wheel, and the effective range of the reported values is [0..71]. Unfortunately, the airbrush stylus also sends wheel events (there is a small wheel on it), but in the range [0..1023]. From the user space point of view it is kind of difficult to understand that because the wheel on the pad are quite common, while the airbrush tool is not. A solution to fix all of these problems is to split out the pad device from the stylus/touch. This decision makes more sense because the pad is not linked to the absolute position of the finger or pen, and usually, the events from the pad are filtered out by the compositor, which then convert them into actions or keyboard shortcuts. For backward compatibility with current xf86-input-wacom, the pad devices still present the ABS_X, ABS_Y and ABS_MISC events, but they can be completely ignored in the new implementation. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Ping Cheng <pingc@wacom.com> Reviewed-by: Jason Gerecke <killertofu@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-07-24 12:48:28 -07:00
error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
if (error) {
/* no pad in use on this interface */
input_free_device(pad_input_dev);
wacom_wac->pad_input = NULL;
pad_input_dev = NULL;
} else {
error = input_register_device(pad_input_dev);
if (error)
goto fail_register_pad_input;
wacom_wac->pad_registered = true;
error = wacom_initialize_leds(wacom);
if (error)
goto fail_leds;
error = wacom_initialize_remote(wacom);
if (error)
goto fail_remote;
Input: wacom - create a separate input device for pads Currently, the pad events are sent through the stylus input device for the Intuos/Cintiqs, and through the touch input device for the Bamboos. To differentiate the buttons pressed on the pad from the ones pressed on the stylus, the Intuos/Cintiq uses MISC_SERIAL and ABS_MISC. This lead to a multiplexing of the events into one device, which are then splitted out in xf86-input-wacom. Bamboos are not using MISC events because the pad is attached to the touch interface, and only BTN_TOUCH is used for the finger (and DOUBLE_TAP, etc...). However, the user space driver still splits out the pad from the touch interface in the same way it does for the pro line devices. The other problem we can see with this fact is that some of the Intuos and Cintiq have a wheel, and the effective range of the reported values is [0..71]. Unfortunately, the airbrush stylus also sends wheel events (there is a small wheel on it), but in the range [0..1023]. From the user space point of view it is kind of difficult to understand that because the wheel on the pad are quite common, while the airbrush tool is not. A solution to fix all of these problems is to split out the pad device from the stylus/touch. This decision makes more sense because the pad is not linked to the absolute position of the finger or pen, and usually, the events from the pad are filtered out by the compositor, which then convert them into actions or keyboard shortcuts. For backward compatibility with current xf86-input-wacom, the pad devices still present the ABS_X, ABS_Y and ABS_MISC events, but they can be completely ignored in the new implementation. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Ping Cheng <pingc@wacom.com> Reviewed-by: Jason Gerecke <killertofu@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-07-24 12:48:28 -07:00
}
return 0;
fail_remote:
wacom_destroy_leds(wacom);
fail_leds:
input_unregister_device(pad_input_dev);
pad_input_dev = NULL;
wacom_wac->pad_registered = false;
fail_register_pad_input:
if (touch_input_dev)
input_unregister_device(touch_input_dev);
wacom_wac->touch_input = NULL;
wacom_wac->touch_registered = false;
fail_register_touch_input:
if (pen_input_dev)
input_unregister_device(pen_input_dev);
wacom_wac->pen_input = NULL;
wacom_wac->pen_registered = false;
fail_register_pen_input:
return error;
}
/*
* Not all devices report physical dimensions from HID.
* Compute the default from hardcoded logical dimension
* and resolution before driver overwrites them.
*/
static void wacom_set_default_phy(struct wacom_features *features)
{
if (features->x_resolution) {
features->x_phy = (features->x_max * 100) /
features->x_resolution;
features->y_phy = (features->y_max * 100) /
features->y_resolution;
}
}
static void wacom_calculate_res(struct wacom_features *features)
{
/* set unit to "100th of a mm" for devices not reported by HID */
if (!features->unit) {
features->unit = 0x11;
features->unitExpo = -3;
}
features->x_resolution = wacom_calc_hid_res(features->x_max,
features->x_phy,
features->unit,
features->unitExpo);
features->y_resolution = wacom_calc_hid_res(features->y_max,
features->y_phy,
features->unit,
features->unitExpo);
}
static void wacom_wireless_work(struct work_struct *work)
{
struct wacom *wacom = container_of(work, struct wacom, work);
struct usb_device *usbdev = wacom->usbdev;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct hid_device *hdev1, *hdev2;
struct wacom *wacom1, *wacom2;
struct wacom_wac *wacom_wac1, *wacom_wac2;
int error;
/*
* Regardless if this is a disconnect or a new tablet,
* remove any existing input and battery devices.
*/
wacom_destroy_battery(wacom);
/* Stylus interface */
hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
wacom1 = hid_get_drvdata(hdev1);
wacom_wac1 = &(wacom1->wacom_wac);
wacom_clean_inputs(wacom1);
/* Touch interface */
hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
wacom2 = hid_get_drvdata(hdev2);
wacom_wac2 = &(wacom2->wacom_wac);
wacom_clean_inputs(wacom2);
if (wacom_wac->pid == 0) {
hid_info(wacom->hdev, "wireless tablet disconnected\n");
wacom_wac1->shared->type = 0;
} else {
const struct hid_device_id *id = wacom_ids;
hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
wacom_wac->pid);
while (id->bus) {
if (id->vendor == USB_VENDOR_ID_WACOM &&
id->product == wacom_wac->pid)
break;
id++;
}
if (!id->bus) {
hid_info(wacom->hdev, "ignoring unknown PID.\n");
return;
}
/* Stylus interface */
wacom_wac1->features =
*((struct wacom_features *)id->driver_data);
wacom_wac1->features.device_type |= WACOM_DEVICETYPE_PEN;
if (wacom_wac1->features.type != INTUOSHT &&
wacom_wac1->features.type != BAMBOO_PT)
wacom_wac1->features.device_type |= WACOM_DEVICETYPE_PAD;
wacom_set_default_phy(&wacom_wac1->features);
wacom_calculate_res(&wacom_wac1->features);
snprintf(wacom_wac1->pen_name, WACOM_NAME_MAX, "%s (WL) Pen",
wacom_wac1->features.name);
snprintf(wacom_wac1->pad_name, WACOM_NAME_MAX, "%s (WL) Pad",
wacom_wac1->features.name);
wacom_wac1->shared->touch_max = wacom_wac1->features.touch_max;
wacom_wac1->shared->type = wacom_wac1->features.type;
wacom_wac1->pid = wacom_wac->pid;
error = wacom_allocate_inputs(wacom1) ||
wacom_register_inputs(wacom1);
if (error)
goto fail;
/* Touch interface */
if (wacom_wac1->features.touch_max ||
wacom_wac1->features.type == INTUOSHT) {
wacom_wac2->features =
*((struct wacom_features *)id->driver_data);
wacom_wac2->features.pktlen = WACOM_PKGLEN_BBTOUCH3;
wacom_set_default_phy(&wacom_wac2->features);
wacom_wac2->features.x_max = wacom_wac2->features.y_max = 4096;
wacom_calculate_res(&wacom_wac2->features);
snprintf(wacom_wac2->touch_name, WACOM_NAME_MAX,
"%s (WL) Finger",wacom_wac2->features.name);
snprintf(wacom_wac2->pad_name, WACOM_NAME_MAX,
"%s (WL) Pad",wacom_wac2->features.name);
if (wacom_wac1->features.touch_max)
wacom_wac2->features.device_type |= WACOM_DEVICETYPE_TOUCH;
if (wacom_wac1->features.type == INTUOSHT ||
wacom_wac1->features.type == BAMBOO_PT)
wacom_wac2->features.device_type |= WACOM_DEVICETYPE_PAD;
wacom_wac2->pid = wacom_wac->pid;
error = wacom_allocate_inputs(wacom2) ||
wacom_register_inputs(wacom2);
if (error)
goto fail;
if (wacom_wac1->features.type == INTUOSHT &&
wacom_wac1->features.touch_max)
wacom_wac->shared->touch_input = wacom_wac2->touch_input;
}
error = wacom_initialize_battery(wacom);
if (error)
goto fail;
}
return;
fail:
wacom_clean_inputs(wacom1);
wacom_clean_inputs(wacom2);
return;
}
void wacom_battery_work(struct work_struct *work)
{
struct wacom *wacom = container_of(work, struct wacom, work);
if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid Pull HID updates from Jiri Kosina: - quite a few firmware fixes for RMI driver by Andrew Duggan - huion and uclogic drivers have been substantially overlaping in functionality laterly. This redundancy is fixed by hid-huion driver being merged into hid-uclogic; work done by Benjamin Tissoires and Nikolai Kondrashov - i2c-hid now supports ACPI GPIO interrupts; patch from Mika Westerberg - Some of the quirks, that got separated into individual drivers, have historically had EXPERT dependency. As HID subsystem matured (as well as the individual drivers), this made less and less sense. This dependency is now being removed by patch from Jean Delvare - Logitech lg4ff driver received a couple of improvements for mode switching, by Michal Malý - multitouch driver now supports clickpads, patches by Benjamin Tissoires and Seth Forshee - hid-sensor framework received a substantial update; namely support for Custom and Generic pages is being added; work done by Srinivas Pandruvada - wacom driver received substantial update; it now supports i2c-conntected devices (Mika Westerberg), Bamboo PADs are now properly supported (Benjamin Tissoires), much improved battery reporting (Jason Gerecke) and pen proximity cleanups (Ping Cheng) - small assorted fixes and device ID additions * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (68 commits) HID: sensor: Update document for custom sensor HID: sensor: Custom and Generic sensor support HID: debug: fix error handling in hid_debug_events_read() Input - mt: Fix input_mt_get_slot_by_key HID: logitech-hidpp: fix error return code HID: wacom: Add support for Cintiq 13HD Touch HID: logitech-hidpp: add a module parameter to keep firmware gestures HID: usbhid: yet another mouse with ALWAYS_POLL HID: usbhid: more mice with ALWAYS_POLL HID: wacom: set stylus_in_proximity before checking touch_down HID: wacom: use wacom_wac_finger_count_touches to set touch_down HID: wacom: remove hardcoded WACOM_QUIRK_MULTI_INPUT HID: pidff: effect can't be NULL HID: add quirk for PIXART OEM mouse used by HP HID: add HP OEM mouse to quirk ALWAYS_POLL HID: wacom: ask for a in-prox report when it was missed HID: hid-sensor-hub: Fix sparse warning HID: hid-sensor-hub: fix attribute read for logical usage id HID: plantronics: fix Kconfig default HID: pidff: support more than one concurrent effect ...
2015-04-14 09:25:26 -07:00
!wacom->battery) {
wacom_initialize_battery(wacom);
}
else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid Pull HID updates from Jiri Kosina: - quite a few firmware fixes for RMI driver by Andrew Duggan - huion and uclogic drivers have been substantially overlaping in functionality laterly. This redundancy is fixed by hid-huion driver being merged into hid-uclogic; work done by Benjamin Tissoires and Nikolai Kondrashov - i2c-hid now supports ACPI GPIO interrupts; patch from Mika Westerberg - Some of the quirks, that got separated into individual drivers, have historically had EXPERT dependency. As HID subsystem matured (as well as the individual drivers), this made less and less sense. This dependency is now being removed by patch from Jean Delvare - Logitech lg4ff driver received a couple of improvements for mode switching, by Michal Malý - multitouch driver now supports clickpads, patches by Benjamin Tissoires and Seth Forshee - hid-sensor framework received a substantial update; namely support for Custom and Generic pages is being added; work done by Srinivas Pandruvada - wacom driver received substantial update; it now supports i2c-conntected devices (Mika Westerberg), Bamboo PADs are now properly supported (Benjamin Tissoires), much improved battery reporting (Jason Gerecke) and pen proximity cleanups (Ping Cheng) - small assorted fixes and device ID additions * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (68 commits) HID: sensor: Update document for custom sensor HID: sensor: Custom and Generic sensor support HID: debug: fix error handling in hid_debug_events_read() Input - mt: Fix input_mt_get_slot_by_key HID: logitech-hidpp: fix error return code HID: wacom: Add support for Cintiq 13HD Touch HID: logitech-hidpp: add a module parameter to keep firmware gestures HID: usbhid: yet another mouse with ALWAYS_POLL HID: usbhid: more mice with ALWAYS_POLL HID: wacom: set stylus_in_proximity before checking touch_down HID: wacom: use wacom_wac_finger_count_touches to set touch_down HID: wacom: remove hardcoded WACOM_QUIRK_MULTI_INPUT HID: pidff: effect can't be NULL HID: add quirk for PIXART OEM mouse used by HP HID: add HP OEM mouse to quirk ALWAYS_POLL HID: wacom: ask for a in-prox report when it was missed HID: hid-sensor-hub: Fix sparse warning HID: hid-sensor-hub: fix attribute read for logical usage id HID: plantronics: fix Kconfig default HID: pidff: support more than one concurrent effect ...
2015-04-14 09:25:26 -07:00
wacom->battery) {
wacom_destroy_battery(wacom);
}
}
static size_t wacom_compute_pktlen(struct hid_device *hdev)
{
struct hid_report_enum *report_enum;
struct hid_report *report;
size_t size = 0;
report_enum = hdev->report_enum + HID_INPUT_REPORT;
list_for_each_entry(report, &report_enum->report_list, list) {
size_t report_size = hid_report_len(report);
if (report_size > size)
size = report_size;
}
return size;
}
static void wacom_update_name(struct wacom *wacom)
{
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct wacom_features *features = &wacom_wac->features;
char name[WACOM_NAME_MAX];
/* Generic devices name unspecified */
if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
if (strstr(wacom->hdev->name, "Wacom") ||
strstr(wacom->hdev->name, "wacom") ||
strstr(wacom->hdev->name, "WACOM")) {
/* name is in HID descriptor, use it */
strlcpy(name, wacom->hdev->name, sizeof(name));
/* strip out excess whitespaces */
while (1) {
char *gap = strstr(name, " ");
if (gap == NULL)
break;
/* shift everything including the terminator */
memmove(gap, gap+1, strlen(gap));
}
/* get rid of trailing whitespace */
if (name[strlen(name)-1] == ' ')
name[strlen(name)-1] = '\0';
} else {
/* no meaningful name retrieved. use product ID */
snprintf(name, sizeof(name),
"%s %X", features->name, wacom->hdev->product);
}
} else {
strlcpy(name, features->name, sizeof(name));
}
/* Append the device type to the name */
snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
"%s Pen", name);
snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
"%s Finger", name);
snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
"%s Pad", name);
}
static int wacom_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
struct usb_device *dev = interface_to_usbdev(intf);
struct wacom *wacom;
struct wacom_wac *wacom_wac;
struct wacom_features *features;
int error;
unsigned int connect_mask = HID_CONNECT_HIDRAW;
if (!id->driver_data)
return -EINVAL;
hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
/* hid-core sets this quirk for the boot interface */
hdev->quirks &= ~HID_QUIRK_NOGET;
wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
if (!wacom)
return -ENOMEM;
hid_set_drvdata(hdev, wacom);
wacom->hdev = hdev;
/* ask for the report descriptor to be loaded by HID */
error = hid_parse(hdev);
if (error) {
hid_err(hdev, "parse failed\n");
goto fail_parse;
}
wacom_wac = &wacom->wacom_wac;
wacom_wac->features = *((struct wacom_features *)id->driver_data);
features = &wacom_wac->features;
features->pktlen = wacom_compute_pktlen(hdev);
if (features->pktlen > WACOM_PKGLEN_MAX) {
error = -EINVAL;
goto fail_pktlen;
}
if (features->check_for_hid_type && features->hid_type != hdev->type) {
error = -ENODEV;
goto fail_type;
}
wacom->usbdev = dev;
wacom->intf = intf;
mutex_init(&wacom->lock);
INIT_WORK(&wacom->work, wacom_wireless_work);
error = wacom_allocate_inputs(wacom);
if (error)
goto fail_allocate_inputs;
/*
* Bamboo Pad has a generic hid handling for the Pen, and we switch it
* into debug mode for the touch part.
* We ignore the other interfaces.
*/
if (features->type == BAMBOO_PAD) {
if (features->pktlen == WACOM_PKGLEN_PENABLED) {
features->type = HID_GENERIC;
} else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
(features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
error = -ENODEV;
goto fail_shared_data;
}
}
/* set the default size in case we do not get them from hid */
wacom_set_default_phy(features);
/* Retrieve the physical and logical size for touch devices */
wacom_retrieve_hid_descriptor(hdev, features);
wacom_setup_device_quirks(wacom);
if (features->device_type == WACOM_DEVICETYPE_NONE &&
features->type != WIRELESS) {
error = features->type == HID_GENERIC ? -ENODEV : 0;
dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
hdev->name,
error ? "Ignoring" : "Assuming pen");
if (error)
goto fail_shared_data;
features->device_type |= WACOM_DEVICETYPE_PEN;
}
wacom_calculate_res(features);
wacom_update_name(wacom);
error = wacom_add_shared_data(hdev);
if (error)
goto fail_shared_data;
if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
(features->quirks & WACOM_QUIRK_BATTERY)) {
error = wacom_initialize_battery(wacom);
if (error)
goto fail_battery;
}
error = wacom_register_inputs(wacom);
if (error)
goto fail_register_inputs;
if (hdev->bus == BUS_BLUETOOTH) {
error = device_create_file(&hdev->dev, &dev_attr_speed);
if (error)
hid_warn(hdev,
"can't create sysfs speed attribute err: %d\n",
error);
}
if (features->type == HID_GENERIC)
connect_mask |= HID_CONNECT_DRIVER;
/* Regular HID work starts now */
error = hid_hw_start(hdev, connect_mask);
if (error) {
hid_err(hdev, "hw start failed\n");
goto fail_hw_start;
}
/* Note that if query fails it is not a hard failure */
wacom_query_tablet_data(hdev, features);
if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
error = hid_hw_open(hdev);
if (wacom_wac->features.type == INTUOSHT &&
wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH) {
wacom_wac->shared->touch_input = wacom_wac->touch_input;
}
return 0;
fail_hw_start:
if (hdev->bus == BUS_BLUETOOTH)
device_remove_file(&hdev->dev, &dev_attr_speed);
fail_register_inputs:
wacom_clean_inputs(wacom);
wacom_destroy_battery(wacom);
fail_battery:
wacom_remove_shared_data(wacom);
fail_shared_data:
wacom_clean_inputs(wacom);
fail_allocate_inputs:
fail_type:
fail_pktlen:
fail_parse:
kfree(wacom);
hid_set_drvdata(hdev, NULL);
return error;
}
static void wacom_remove(struct hid_device *hdev)
{
struct wacom *wacom = hid_get_drvdata(hdev);
hid_hw_stop(hdev);
cancel_work_sync(&wacom->work);
wacom_clean_inputs(wacom);
if (hdev->bus == BUS_BLUETOOTH)
device_remove_file(&hdev->dev, &dev_attr_speed);
wacom_destroy_battery(wacom);
wacom_remove_shared_data(wacom);
hid_set_drvdata(hdev, NULL);
kfree(wacom);
}
#ifdef CONFIG_PM
static int wacom_resume(struct hid_device *hdev)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
mutex_lock(&wacom->lock);
/* switch to wacom mode first */
wacom_query_tablet_data(hdev, features);
wacom_led_control(wacom);
mutex_unlock(&wacom->lock);
return 0;
}
static int wacom_reset_resume(struct hid_device *hdev)
{
return wacom_resume(hdev);
}
#endif /* CONFIG_PM */
static struct hid_driver wacom_driver = {
.name = "wacom",
.id_table = wacom_ids,
.probe = wacom_probe,
.remove = wacom_remove,
.report = wacom_wac_report,
#ifdef CONFIG_PM
.resume = wacom_resume,
.reset_resume = wacom_reset_resume,
#endif
.raw_event = wacom_raw_event,
};
module_hid_driver(wacom_driver);
MODULE_VERSION(DRIVER_VERSION);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);