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linux/drivers/acpi/video.c
Richard Purdie 599a52d126 backlight: Separate backlight properties from backlight ops pointers 
Per device data such as brightness belongs to the indivdual device
and should therefore be separate from the the backlight operation
function pointers. This patch splits the two types of data and
allows simplifcation of some code.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
2007-02-20 09:26:53 +00:00

1909 lines
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/*
* video.c - ACPI Video Driver ($Revision:$)
*
* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
* Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
* Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/backlight.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define ACPI_VIDEO_COMPONENT 0x08000000
#define ACPI_VIDEO_CLASS "video"
#define ACPI_VIDEO_BUS_NAME "Video Bus"
#define ACPI_VIDEO_DEVICE_NAME "Video Device"
#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
#define ACPI_VIDEO_NOTIFY_PROBE 0x81
#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
#define ACPI_VIDEO_HEAD_INVALID (~0u - 1)
#define ACPI_VIDEO_HEAD_END (~0u)
#define MAX_NAME_LEN 20
#define ACPI_VIDEO_DISPLAY_CRT 1
#define ACPI_VIDEO_DISPLAY_TV 2
#define ACPI_VIDEO_DISPLAY_DVI 3
#define ACPI_VIDEO_DISPLAY_LCD 4
#define _COMPONENT ACPI_VIDEO_COMPONENT
ACPI_MODULE_NAME("video");
MODULE_AUTHOR("Bruno Ducrot");
MODULE_DESCRIPTION("ACPI Video Driver");
MODULE_LICENSE("GPL");
static int acpi_video_bus_add(struct acpi_device *device);
static int acpi_video_bus_remove(struct acpi_device *device, int type);
static struct acpi_driver acpi_video_bus = {
.name = "video",
.class = ACPI_VIDEO_CLASS,
.ids = ACPI_VIDEO_HID,
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
},
};
struct acpi_video_bus_flags {
u8 multihead:1; /* can switch video heads */
u8 rom:1; /* can retrieve a video rom */
u8 post:1; /* can configure the head to */
u8 reserved:5;
};
struct acpi_video_bus_cap {
u8 _DOS:1; /*Enable/Disable output switching */
u8 _DOD:1; /*Enumerate all devices attached to display adapter */
u8 _ROM:1; /*Get ROM Data */
u8 _GPD:1; /*Get POST Device */
u8 _SPD:1; /*Set POST Device */
u8 _VPO:1; /*Video POST Options */
u8 reserved:2;
};
struct acpi_video_device_attrib {
u32 display_index:4; /* A zero-based instance of the Display */
u32 display_port_attachment:4; /*This field differenates displays type */
u32 display_type:4; /*Describe the specific type in use */
u32 vendor_specific:4; /*Chipset Vendor Specifi */
u32 bios_can_detect:1; /*BIOS can detect the device */
u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
the VGA device. */
u32 pipe_id:3; /*For VGA multiple-head devices. */
u32 reserved:10; /*Must be 0 */
u32 device_id_scheme:1; /*Device ID Scheme */
};
struct acpi_video_enumerated_device {
union {
u32 int_val;
struct acpi_video_device_attrib attrib;
} value;
struct acpi_video_device *bind_info;
};
struct acpi_video_bus {
struct acpi_device *device;
u8 dos_setting;
struct acpi_video_enumerated_device *attached_array;
u8 attached_count;
struct acpi_video_bus_cap cap;
struct acpi_video_bus_flags flags;
struct semaphore sem;
struct list_head video_device_list;
struct proc_dir_entry *dir;
};
struct acpi_video_device_flags {
u8 crt:1;
u8 lcd:1;
u8 tvout:1;
u8 dvi:1;
u8 bios:1;
u8 unknown:1;
u8 reserved:2;
};
struct acpi_video_device_cap {
u8 _ADR:1; /*Return the unique ID */
u8 _BCL:1; /*Query list of brightness control levels supported */
u8 _BCM:1; /*Set the brightness level */
u8 _BQC:1; /* Get current brightness level */
u8 _DDC:1; /*Return the EDID for this device */
u8 _DCS:1; /*Return status of output device */
u8 _DGS:1; /*Query graphics state */
u8 _DSS:1; /*Device state set */
};
struct acpi_video_device_brightness {
int curr;
int count;
int *levels;
};
struct acpi_video_device {
unsigned long device_id;
struct acpi_video_device_flags flags;
struct acpi_video_device_cap cap;
struct list_head entry;
struct acpi_video_bus *video;
struct acpi_device *dev;
struct acpi_video_device_brightness *brightness;
struct backlight_device *backlight;
};
/* bus */
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_info_fops = {
.open = acpi_video_bus_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_ROM_fops = {
.open = acpi_video_bus_ROM_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_bus_POST_info_fops = {
.open = acpi_video_bus_POST_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_POST_fops = {
.open = acpi_video_bus_POST_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_DOS_fops = {
.open = acpi_video_bus_DOS_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* device */
static int acpi_video_device_info_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_device_info_fops = {
.open = acpi_video_device_info_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_state_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_device_state_fops = {
.open = acpi_video_device_state_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_brightness_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_device_brightness_fops = {
.open = acpi_video_device_brightness_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int acpi_video_device_EDID_open_fs(struct inode *inode,
struct file *file);
static struct file_operations acpi_video_device_EDID_fops = {
.open = acpi_video_device_EDID_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static char device_decode[][30] = {
"motherboard VGA device",
"PCI VGA device",
"AGP VGA device",
"UNKNOWN",
};
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
static void acpi_video_device_rebind(struct acpi_video_bus *video);
static void acpi_video_device_bind(struct acpi_video_bus *video,
struct acpi_video_device *device);
static int acpi_video_device_enumerate(struct acpi_video_bus *video);
static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
int level);
static int acpi_video_device_lcd_get_level_current(
struct acpi_video_device *device,
unsigned long *level);
static int acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event);
static void acpi_video_switch_brightness(struct acpi_video_device *device,
int event);
/*backlight device sysfs support*/
static int acpi_video_get_brightness(struct backlight_device *bd)
{
unsigned long cur_level;
struct acpi_video_device *vd =
(struct acpi_video_device *)class_get_devdata(&bd->class_dev);
acpi_video_device_lcd_get_level_current(vd, &cur_level);
return (int) cur_level;
}
static int acpi_video_set_brightness(struct backlight_device *bd)
{
int request_level = bd->props.brightness;
struct acpi_video_device *vd =
(struct acpi_video_device *)class_get_devdata(&bd->class_dev);
acpi_video_device_lcd_set_level(vd, request_level);
return 0;
}
static struct backlight_ops acpi_backlight_ops = {
.get_brightness = acpi_video_get_brightness,
.update_status = acpi_video_set_brightness,
};
/* --------------------------------------------------------------------------
Video Management
-------------------------------------------------------------------------- */
/* device */
static int
acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
{
int status;
status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
return status;
}
static int
acpi_video_device_get_state(struct acpi_video_device *device,
unsigned long *state)
{
int status;
status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
return status;
}
static int
acpi_video_device_set_state(struct acpi_video_device *device, int state)
{
int status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
unsigned long ret;
arg0.integer.value = state;
status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
return status;
}
static int
acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
union acpi_object **levels)
{
int status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
*levels = NULL;
status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
if (!ACPI_SUCCESS(status))
return status;
obj = (union acpi_object *)buffer.pointer;
if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
printk(KERN_ERR PREFIX "Invalid _BCL data\n");
status = -EFAULT;
goto err;
}
*levels = obj;
return 0;
err:
kfree(buffer.pointer);
return status;
}
static int
acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
{
int status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
arg0.integer.value = level;
status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
printk(KERN_DEBUG "set_level status: %x\n", status);
return status;
}
static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
unsigned long *level)
{
int status;
status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
return status;
}
static int
acpi_video_device_EDID(struct acpi_video_device *device,
union acpi_object **edid, ssize_t length)
{
int status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
*edid = NULL;
if (!device)
return -ENODEV;
if (length == 128)
arg0.integer.value = 1;
else if (length == 256)
arg0.integer.value = 2;
else
return -EINVAL;
status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
if (ACPI_FAILURE(status))
return -ENODEV;
obj = buffer.pointer;
if (obj && obj->type == ACPI_TYPE_BUFFER)
*edid = obj;
else {
printk(KERN_ERR PREFIX "Invalid _DDC data\n");
status = -EFAULT;
kfree(obj);
}
return status;
}
/* bus */
static int
acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
{
int status;
unsigned long tmp;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
arg0.integer.value = option;
status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
if (ACPI_SUCCESS(status))
status = tmp ? (-EINVAL) : (AE_OK);
return status;
}
static int
acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
{
int status;
status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
return status;
}
static int
acpi_video_bus_POST_options(struct acpi_video_bus *video,
unsigned long *options)
{
int status;
status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
*options &= 3;
return status;
}
/*
* Arg:
* video : video bus device pointer
* bios_flag :
* 0. The system BIOS should NOT automatically switch(toggle)
* the active display output.
* 1. The system BIOS should automatically switch (toggle) the
* active display output. No swich event.
* 2. The _DGS value should be locked.
* 3. The system BIOS should not automatically switch (toggle) the
* active display output, but instead generate the display switch
* event notify code.
* lcd_flag :
* 0. The system BIOS should automatically control the brightness level
* of the LCD, when the power changes from AC to DC
* 1. The system BIOS should NOT automatically control the brightness
* level of the LCD, when the power changes from AC to DC.
* Return Value:
* -1 wrong arg.
*/
static int
acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
{
acpi_integer status = 0;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
status = -1;
goto Failed;
}
arg0.integer.value = (lcd_flag << 2) | bios_flag;
video->dos_setting = arg0.integer.value;
acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
Failed:
return status;
}
/*
* Arg:
* device : video output device (LCD, CRT, ..)
*
* Return Value:
* None
*
* Find out all required AML method defined under the output
* device.
*/
static void acpi_video_device_find_cap(struct acpi_video_device *device)
{
acpi_integer status;
acpi_handle h_dummy1;
int i;
u32 max_level = 0;
union acpi_object *obj = NULL;
struct acpi_video_device_brightness *br = NULL;
memset(&device->cap, 0, 4);
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
device->cap._ADR = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
device->cap._BCL = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
device->cap._BCM = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
device->cap._BQC = 1;
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
device->cap._DDC = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
device->cap._DCS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
device->cap._DGS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
device->cap._DSS = 1;
}
status = acpi_video_device_lcd_query_levels(device, &obj);
if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
int count = 0;
union acpi_object *o;
br = kzalloc(sizeof(*br), GFP_KERNEL);
if (!br) {
printk(KERN_ERR "can't allocate memory\n");
} else {
br->levels = kmalloc(obj->package.count *
sizeof *(br->levels), GFP_KERNEL);
if (!br->levels)
goto out;
for (i = 0; i < obj->package.count; i++) {
o = (union acpi_object *)&obj->package.
elements[i];
if (o->type != ACPI_TYPE_INTEGER) {
printk(KERN_ERR PREFIX "Invalid data\n");
continue;
}
br->levels[count] = (u32) o->integer.value;
if (br->levels[count] > max_level)
max_level = br->levels[count];
count++;
}
out:
if (count < 2) {
kfree(br->levels);
kfree(br);
} else {
br->count = count;
device->brightness = br;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"found %d brightness levels\n",
count));
}
}
}
kfree(obj);
if (device->cap._BCL && device->cap._BCM && device->cap._BQC){
unsigned long tmp;
static int count = 0;
char *name;
name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
if (!name)
return;
sprintf(name, "acpi_video%d", count++);
acpi_video_device_lcd_get_level_current(device, &tmp);
device->backlight = backlight_device_register(name,
NULL, device, &acpi_backlight_ops);
device->backlight->props.max_brightness = max_level;
device->backlight->props.brightness = (int)tmp;
backlight_update_status(device->backlight);
kfree(name);
}
return;
}
/*
* Arg:
* device : video output device (VGA)
*
* Return Value:
* None
*
* Find out all required AML method defined under the video bus device.
*/
static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
{
acpi_handle h_dummy1;
memset(&video->cap, 0, 4);
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
video->cap._DOS = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
video->cap._DOD = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
video->cap._ROM = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
video->cap._GPD = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
video->cap._SPD = 1;
}
if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
video->cap._VPO = 1;
}
}
/*
* Check whether the video bus device has required AML method to
* support the desired features
*/
static int acpi_video_bus_check(struct acpi_video_bus *video)
{
acpi_status status = -ENOENT;
if (!video)
return -EINVAL;
/* Since there is no HID, CID and so on for VGA driver, we have
* to check well known required nodes.
*/
/* Does this device able to support video switching ? */
if (video->cap._DOS) {
video->flags.multihead = 1;
status = 0;
}
/* Does this device able to retrieve a retrieve a video ROM ? */
if (video->cap._ROM) {
video->flags.rom = 1;
status = 0;
}
/* Does this device able to configure which video device to POST ? */
if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
video->flags.post = 1;
status = 0;
}
return status;
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
static struct proc_dir_entry *acpi_video_dir;
/* video devices */
static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_device *dev = seq->private;
if (!dev)
goto end;
seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
seq_printf(seq, "type: ");
if (dev->flags.crt)
seq_printf(seq, "CRT\n");
else if (dev->flags.lcd)
seq_printf(seq, "LCD\n");
else if (dev->flags.tvout)
seq_printf(seq, "TVOUT\n");
else if (dev->flags.dvi)
seq_printf(seq, "DVI\n");
else
seq_printf(seq, "UNKNOWN\n");
seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
end:
return 0;
}
static int
acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_info_seq_show,
PDE(inode)->data);
}
static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
{
int status;
struct acpi_video_device *dev = seq->private;
unsigned long state;
if (!dev)
goto end;
status = acpi_video_device_get_state(dev, &state);
seq_printf(seq, "state: ");
if (ACPI_SUCCESS(status))
seq_printf(seq, "0x%02lx\n", state);
else
seq_printf(seq, "<not supported>\n");
status = acpi_video_device_query(dev, &state);
seq_printf(seq, "query: ");
if (ACPI_SUCCESS(status))
seq_printf(seq, "0x%02lx\n", state);
else
seq_printf(seq, "<not supported>\n");
end:
return 0;
}
static int
acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_state_seq_show,
PDE(inode)->data);
}
static ssize_t
acpi_video_device_write_state(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
int status;
struct seq_file *m = file->private_data;
struct acpi_video_device *dev = m->private;
char str[12] = { 0 };
u32 state = 0;
if (!dev || count + 1 > sizeof str)
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
state = simple_strtoul(str, NULL, 0);
state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
status = acpi_video_device_set_state(dev, state);
if (status)
return -EFAULT;
return count;
}
static int
acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_device *dev = seq->private;
int i;
if (!dev || !dev->brightness) {
seq_printf(seq, "<not supported>\n");
return 0;
}
seq_printf(seq, "levels: ");
for (i = 0; i < dev->brightness->count; i++)
seq_printf(seq, " %d", dev->brightness->levels[i]);
seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
return 0;
}
static int
acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_brightness_seq_show,
PDE(inode)->data);
}
static ssize_t
acpi_video_device_write_brightness(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
struct seq_file *m = file->private_data;
struct acpi_video_device *dev = m->private;
char str[4] = { 0 };
unsigned int level = 0;
int i;
if (!dev || !dev->brightness || count + 1 > sizeof str)
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
level = simple_strtoul(str, NULL, 0);
if (level > 100)
return -EFAULT;
/* validate though the list of available levels */
for (i = 0; i < dev->brightness->count; i++)
if (level == dev->brightness->levels[i]) {
if (ACPI_SUCCESS
(acpi_video_device_lcd_set_level(dev, level)))
dev->brightness->curr = level;
break;
}
return count;
}
static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_device *dev = seq->private;
int status;
int i;
union acpi_object *edid = NULL;
if (!dev)
goto out;
status = acpi_video_device_EDID(dev, &edid, 128);
if (ACPI_FAILURE(status)) {
status = acpi_video_device_EDID(dev, &edid, 256);
}
if (ACPI_FAILURE(status)) {
goto out;
}
if (edid && edid->type == ACPI_TYPE_BUFFER) {
for (i = 0; i < edid->buffer.length; i++)
seq_putc(seq, edid->buffer.pointer[i]);
}
out:
if (!edid)
seq_printf(seq, "<not supported>\n");
else
kfree(edid);
return 0;
}
static int
acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_device_EDID_seq_show,
PDE(inode)->data);
}
static int acpi_video_device_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
struct acpi_video_device *vid_dev;
if (!device)
return -ENODEV;
vid_dev = acpi_driver_data(device);
if (!vid_dev)
return -ENODEV;
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
vid_dev->video->dir);
if (!acpi_device_dir(device))
return -ENODEV;
acpi_device_dir(device)->owner = THIS_MODULE;
}
/* 'info' [R] */
entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_device_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'state' [R/W] */
entry =
create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_device_state_fops.write = acpi_video_device_write_state;
entry->proc_fops = &acpi_video_device_state_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'brightness' [R/W] */
entry =
create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
entry->proc_fops = &acpi_video_device_brightness_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'EDID' [R] */
entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_device_EDID_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return 0;
}
static int acpi_video_device_remove_fs(struct acpi_device *device)
{
struct acpi_video_device *vid_dev;
vid_dev = acpi_driver_data(device);
if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
return -ENODEV;
if (acpi_device_dir(device)) {
remove_proc_entry("info", acpi_device_dir(device));
remove_proc_entry("state", acpi_device_dir(device));
remove_proc_entry("brightness", acpi_device_dir(device));
remove_proc_entry("EDID", acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
acpi_device_dir(device) = NULL;
}
return 0;
}
/* video bus */
static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = seq->private;
if (!video)
goto end;
seq_printf(seq, "Switching heads: %s\n",
video->flags.multihead ? "yes" : "no");
seq_printf(seq, "Video ROM: %s\n",
video->flags.rom ? "yes" : "no");
seq_printf(seq, "Device to be POSTed on boot: %s\n",
video->flags.post ? "yes" : "no");
end:
return 0;
}
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_info_seq_show,
PDE(inode)->data);
}
static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = seq->private;
if (!video)
goto end;
printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
seq_printf(seq, "<TODO>\n");
end:
return 0;
}
static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
}
static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = seq->private;
unsigned long options;
int status;
if (!video)
goto end;
status = acpi_video_bus_POST_options(video, &options);
if (ACPI_SUCCESS(status)) {
if (!(options & 1)) {
printk(KERN_WARNING PREFIX
"The motherboard VGA device is not listed as a possible POST device.\n");
printk(KERN_WARNING PREFIX
"This indicate a BIOS bug. Please contact the manufacturer.\n");
}
printk("%lx\n", options);
seq_printf(seq, "can POST: <intgrated video>");
if (options & 2)
seq_printf(seq, " <PCI video>");
if (options & 4)
seq_printf(seq, " <AGP video>");
seq_putc(seq, '\n');
} else
seq_printf(seq, "<not supported>\n");
end:
return 0;
}
static int
acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_POST_info_seq_show,
PDE(inode)->data);
}
static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = seq->private;
int status;
unsigned long id;
if (!video)
goto end;
status = acpi_video_bus_get_POST(video, &id);
if (!ACPI_SUCCESS(status)) {
seq_printf(seq, "<not supported>\n");
goto end;
}
seq_printf(seq, "device posted is <%s>\n", device_decode[id & 3]);
end:
return 0;
}
static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_video_bus *video = seq->private;
seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
return 0;
}
static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_POST_seq_show,
PDE(inode)->data);
}
static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
}
static ssize_t
acpi_video_bus_write_POST(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
int status;
struct seq_file *m = file->private_data;
struct acpi_video_bus *video = m->private;
char str[12] = { 0 };
unsigned long opt, options;
if (!video || count + 1 > sizeof str)
return -EINVAL;
status = acpi_video_bus_POST_options(video, &options);
if (!ACPI_SUCCESS(status))
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
opt = strtoul(str, NULL, 0);
if (opt > 3)
return -EFAULT;
/* just in case an OEM 'forget' the motherboard... */
options |= 1;
if (options & (1ul << opt)) {
status = acpi_video_bus_set_POST(video, opt);
if (!ACPI_SUCCESS(status))
return -EFAULT;
}
return count;
}
static ssize_t
acpi_video_bus_write_DOS(struct file *file,
const char __user * buffer,
size_t count, loff_t * data)
{
int status;
struct seq_file *m = file->private_data;
struct acpi_video_bus *video = m->private;
char str[12] = { 0 };
unsigned long opt;
if (!video || count + 1 > sizeof str)
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EFAULT;
str[count] = 0;
opt = strtoul(str, NULL, 0);
if (opt > 7)
return -EFAULT;
status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
if (!ACPI_SUCCESS(status))
return -EFAULT;
return count;
}
static int acpi_video_bus_add_fs(struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
struct acpi_video_bus *video;
video = acpi_driver_data(device);
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_video_dir);
if (!acpi_device_dir(device))
return -ENODEV;
video->dir = acpi_device_dir(device);
acpi_device_dir(device)->owner = THIS_MODULE;
}
/* 'info' [R] */
entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_bus_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'ROM' [R] */
entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_bus_ROM_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'POST_info' [R] */
entry =
create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
entry->proc_fops = &acpi_video_bus_POST_info_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'POST' [R/W] */
entry =
create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
entry->proc_fops = &acpi_video_bus_POST_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
/* 'DOS' [R/W] */
entry =
create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
acpi_device_dir(device));
if (!entry)
return -ENODEV;
else {
acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
entry->proc_fops = &acpi_video_bus_DOS_fops;
entry->data = acpi_driver_data(device);
entry->owner = THIS_MODULE;
}
return 0;
}
static int acpi_video_bus_remove_fs(struct acpi_device *device)
{
struct acpi_video_bus *video;
video = acpi_driver_data(device);
if (acpi_device_dir(device)) {
remove_proc_entry("info", acpi_device_dir(device));
remove_proc_entry("ROM", acpi_device_dir(device));
remove_proc_entry("POST_info", acpi_device_dir(device));
remove_proc_entry("POST", acpi_device_dir(device));
remove_proc_entry("DOS", acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
acpi_device_dir(device) = NULL;
}
return 0;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
/* device interface */
static struct acpi_video_device_attrib*
acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
{
int count;
for(count = 0; count < video->attached_count; count++)
if((video->attached_array[count].value.int_val & 0xffff) == device_id)
return &(video->attached_array[count].value.attrib);
return NULL;
}
static int
acpi_video_bus_get_one_device(struct acpi_device *device,
struct acpi_video_bus *video)
{
unsigned long device_id;
int status;
struct acpi_video_device *data;
struct acpi_video_device_attrib* attribute;
if (!device || !video)
return -EINVAL;
status =
acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
if (ACPI_SUCCESS(status)) {
data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
if (!data)
return -ENOMEM;
strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
acpi_driver_data(device) = data;
data->device_id = device_id;
data->video = video;
data->dev = device;
attribute = acpi_video_get_device_attr(video, device_id);
if((attribute != NULL) && attribute->device_id_scheme) {
switch (attribute->display_type) {
case ACPI_VIDEO_DISPLAY_CRT:
data->flags.crt = 1;
break;
case ACPI_VIDEO_DISPLAY_TV:
data->flags.tvout = 1;
break;
case ACPI_VIDEO_DISPLAY_DVI:
data->flags.dvi = 1;
break;
case ACPI_VIDEO_DISPLAY_LCD:
data->flags.lcd = 1;
break;
default:
data->flags.unknown = 1;
break;
}
if(attribute->bios_can_detect)
data->flags.bios = 1;
} else
data->flags.unknown = 1;
acpi_video_device_bind(video, data);
acpi_video_device_find_cap(data);
status = acpi_install_notify_handler(device->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_device_notify,
data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
if(data->brightness)
kfree(data->brightness->levels);
kfree(data->brightness);
kfree(data);
return -ENODEV;
}
down(&video->sem);
list_add_tail(&data->entry, &video->video_device_list);
up(&video->sem);
acpi_video_device_add_fs(device);
return 0;
}
return -ENOENT;
}
/*
* Arg:
* video : video bus device
*
* Return:
* none
*
* Enumerate the video device list of the video bus,
* bind the ids with the corresponding video devices
* under the video bus.
*/
static void acpi_video_device_rebind(struct acpi_video_bus *video)
{
struct list_head *node, *next;
list_for_each_safe(node, next, &video->video_device_list) {
struct acpi_video_device *dev =
container_of(node, struct acpi_video_device, entry);
acpi_video_device_bind(video, dev);
}
}
/*
* Arg:
* video : video bus device
* device : video output device under the video
* bus
*
* Return:
* none
*
* Bind the ids with the corresponding video devices
* under the video bus.
*/
static void
acpi_video_device_bind(struct acpi_video_bus *video,
struct acpi_video_device *device)
{
int i;
#define IDS_VAL(i) video->attached_array[i].value.int_val
#define IDS_BIND(i) video->attached_array[i].bind_info
for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
i < video->attached_count; i++) {
if (device->device_id == (IDS_VAL(i) & 0xffff)) {
IDS_BIND(i) = device;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
}
}
#undef IDS_VAL
#undef IDS_BIND
}
/*
* Arg:
* video : video bus device
*
* Return:
* < 0 : error
*
* Call _DOD to enumerate all devices attached to display adapter
*
*/
static int acpi_video_device_enumerate(struct acpi_video_bus *video)
{
int status;
int count;
int i;
struct acpi_video_enumerated_device *active_device_list;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *dod = NULL;
union acpi_object *obj;
status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
if (!ACPI_SUCCESS(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
return status;
}
dod = buffer.pointer;
if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
status = -EFAULT;
goto out;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
dod->package.count));
active_device_list = kmalloc((1 +
dod->package.count) *
sizeof(struct
acpi_video_enumerated_device),
GFP_KERNEL);
if (!active_device_list) {
status = -ENOMEM;
goto out;
}
count = 0;
for (i = 0; i < dod->package.count; i++) {
obj = &dod->package.elements[i];
if (obj->type != ACPI_TYPE_INTEGER) {
printk(KERN_ERR PREFIX "Invalid _DOD data\n");
active_device_list[i].value.int_val =
ACPI_VIDEO_HEAD_INVALID;
}
active_device_list[i].value.int_val = obj->integer.value;
active_device_list[i].bind_info = NULL;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
(int)obj->integer.value));
count++;
}
active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
kfree(video->attached_array);
video->attached_array = active_device_list;
video->attached_count = count;
out:
kfree(buffer.pointer);
return status;
}
/*
* Arg:
* video : video bus device
* event : Nontify Event
*
* Return:
* < 0 : error
*
* 1. Find out the current active output device.
* 2. Identify the next output device to switch
* 3. call _DSS to do actual switch.
*/
static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
{
struct list_head *node, *next;
struct acpi_video_device *dev = NULL;
struct acpi_video_device *dev_next = NULL;
struct acpi_video_device *dev_prev = NULL;
unsigned long state;
int status = 0;
list_for_each_safe(node, next, &video->video_device_list) {
dev = container_of(node, struct acpi_video_device, entry);
status = acpi_video_device_get_state(dev, &state);
if (state & 0x2) {
dev_next =
container_of(node->next, struct acpi_video_device,
entry);
dev_prev =
container_of(node->prev, struct acpi_video_device,
entry);
goto out;
}
}
dev_next = container_of(node->next, struct acpi_video_device, entry);
dev_prev = container_of(node->prev, struct acpi_video_device, entry);
out:
switch (event) {
case ACPI_VIDEO_NOTIFY_CYCLE:
case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
acpi_video_device_set_state(dev, 0);
acpi_video_device_set_state(dev_next, 0x80000001);
break;
case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
acpi_video_device_set_state(dev, 0);
acpi_video_device_set_state(dev_prev, 0x80000001);
default:
break;
}
return status;
}
static int
acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event)
{
int min, max, min_above, max_below, i, l;
max = max_below = 0;
min = min_above = 255;
for (i = 0; i < device->brightness->count; i++) {
l = device->brightness->levels[i];
if (l < min)
min = l;
if (l > max)
max = l;
if (l < min_above && l > level_current)
min_above = l;
if (l > max_below && l < level_current)
max_below = l;
}
switch (event) {
case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
return (level_current < max) ? min_above : min;
case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
return (level_current < max) ? min_above : max;
case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
return (level_current > min) ? max_below : min;
case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
return 0;
default:
return level_current;
}
}
static void
acpi_video_switch_brightness(struct acpi_video_device *device, int event)
{
unsigned long level_current, level_next;
acpi_video_device_lcd_get_level_current(device, &level_current);
level_next = acpi_video_get_next_level(device, level_current, event);
acpi_video_device_lcd_set_level(device, level_next);
}
static int
acpi_video_bus_get_devices(struct acpi_video_bus *video,
struct acpi_device *device)
{
int status = 0;
struct list_head *node, *next;
acpi_video_device_enumerate(video);
list_for_each_safe(node, next, &device->children) {
struct acpi_device *dev =
list_entry(node, struct acpi_device, node);
if (!dev)
continue;
status = acpi_video_bus_get_one_device(dev, video);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
continue;
}
}
return status;
}
static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
{
acpi_status status;
struct acpi_video_bus *video;
if (!device || !device->video)
return -ENOENT;
video = device->video;
down(&video->sem);
list_del(&device->entry);
up(&video->sem);
acpi_video_device_remove_fs(device->dev);
status = acpi_remove_notify_handler(device->dev->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_device_notify);
backlight_device_unregister(device->backlight);
return 0;
}
static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
{
int status;
struct list_head *node, *next;
list_for_each_safe(node, next, &video->video_device_list) {
struct acpi_video_device *data =
list_entry(node, struct acpi_video_device, entry);
if (!data)
continue;
status = acpi_video_bus_put_one_device(data);
if (ACPI_FAILURE(status))
printk(KERN_WARNING PREFIX
"hhuuhhuu bug in acpi video driver.\n");
if (data->brightness)
kfree(data->brightness->levels);
kfree(data->brightness);
kfree(data);
}
return 0;
}
/* acpi_video interface */
static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
{
return acpi_video_bus_DOS(video, 1, 0);
}
static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
{
return acpi_video_bus_DOS(video, 0, 1);
}
static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_video_bus *video = data;
struct acpi_device *device = NULL;
printk("video bus notify\n");
if (!video)
return;
device = video->device;
switch (event) {
case ACPI_VIDEO_NOTIFY_SWITCH: /* User request that a switch occur,
* most likely via hotkey. */
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_VIDEO_NOTIFY_PROBE: /* User plug or remove a video
* connector. */
acpi_video_device_enumerate(video);
acpi_video_device_rebind(video);
acpi_video_switch_output(video, event);
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
acpi_video_switch_output(video, event);
acpi_bus_generate_event(device, event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return;
}
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
{
struct acpi_video_device *video_device = data;
struct acpi_device *device = NULL;
if (!video_device)
return;
device = video_device->dev;
switch (event) {
case ACPI_VIDEO_NOTIFY_SWITCH: /* change in status (cycle output device) */
case ACPI_VIDEO_NOTIFY_PROBE: /* change in status (output device status) */
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
acpi_video_switch_brightness(video_device, event);
acpi_bus_generate_event(device, event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return;
}
static int acpi_video_bus_add(struct acpi_device *device)
{
int result = 0;
acpi_status status = 0;
struct acpi_video_bus *video = NULL;
if (!device)
return -EINVAL;
video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
if (!video)
return -ENOMEM;
video->device = device;
strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
acpi_driver_data(device) = video;
acpi_video_bus_find_cap(video);
result = acpi_video_bus_check(video);
if (result)
goto end;
result = acpi_video_bus_add_fs(device);
if (result)
goto end;
init_MUTEX(&video->sem);
INIT_LIST_HEAD(&video->video_device_list);
acpi_video_bus_get_devices(video, device);
acpi_video_bus_start_devices(video);
status = acpi_install_notify_handler(device->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_bus_notify, video);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
acpi_video_bus_stop_devices(video);
acpi_video_bus_put_devices(video);
kfree(video->attached_array);
acpi_video_bus_remove_fs(device);
result = -ENODEV;
goto end;
}
printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
video->flags.multihead ? "yes" : "no",
video->flags.rom ? "yes" : "no",
video->flags.post ? "yes" : "no");
end:
if (result)
kfree(video);
return result;
}
static int acpi_video_bus_remove(struct acpi_device *device, int type)
{
acpi_status status = 0;
struct acpi_video_bus *video = NULL;
if (!device || !acpi_driver_data(device))
return -EINVAL;
video = acpi_driver_data(device);
acpi_video_bus_stop_devices(video);
status = acpi_remove_notify_handler(video->device->handle,
ACPI_DEVICE_NOTIFY,
acpi_video_bus_notify);
acpi_video_bus_put_devices(video);
acpi_video_bus_remove_fs(device);
kfree(video->attached_array);
kfree(video);
return 0;
}
static int __init acpi_video_init(void)
{
int result = 0;
/*
acpi_dbg_level = 0xFFFFFFFF;
acpi_dbg_layer = 0x08000000;
*/
acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
if (!acpi_video_dir)
return -ENODEV;
acpi_video_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&acpi_video_bus);
if (result < 0) {
remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
return -ENODEV;
}
return 0;
}
static void __exit acpi_video_exit(void)
{
acpi_bus_unregister_driver(&acpi_video_bus);
remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
return;
}
module_init(acpi_video_init);
module_exit(acpi_video_exit);
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