1
linux/drivers/acpi/sony_acpi.c
Alessandro Guido 50f62afb11 sony_acpi: Add backlight support to the sony_acpi
Make the sony_acpi use the backlight subsystem to adjust brightness value
instead of using the /proc/sony/brightness file.  (Other settings will
still have a /proc/sony/...  entry)

Signed-off-by: Alessandro Guido <alessandro.guido@gmail.com>
Cc: Stelian Pop <stelian@popies.net>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
2007-02-13 03:05:35 -05:00

452 lines
11 KiB
C

/*
* ACPI Sony Notebook Control Driver (SNC)
*
* Copyright (C) 2004-2005 Stelian Pop <stelian@popies.net>
*
* Parts of this driver inspired from asus_acpi.c and ibm_acpi.c
* which are copyrighted by their respective authors.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>
#define ACPI_SNC_CLASS "sony"
#define ACPI_SNC_HID "SNY5001"
#define ACPI_SNC_DRIVER_NAME "ACPI Sony Notebook Control Driver v0.3"
/* the device uses 1-based values, while the backlight subsystem uses
0-based values */
#define SONY_MAX_BRIGHTNESS 8
#define LOG_PFX KERN_WARNING "sony_acpi: "
MODULE_AUTHOR("Stelian Pop");
MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "set this to 1 (and RTFM) if you want to help "
"the development of this driver");
static acpi_handle sony_acpi_handle;
static struct proc_dir_entry *sony_acpi_dir;
static int sony_backlight_update_status(struct backlight_device *bd);
static int sony_backlight_get_brightness(struct backlight_device *bd);
static struct backlight_device *sony_backlight_device;
static struct backlight_properties sony_backlight_properties = {
.owner = THIS_MODULE,
.update_status = sony_backlight_update_status,
.get_brightness = sony_backlight_get_brightness,
.max_brightness = SONY_MAX_BRIGHTNESS - 1,
};
static struct sony_acpi_value {
char *name; /* name of the entry */
struct proc_dir_entry *proc; /* /proc entry */
char *acpiget;/* name of the ACPI get function */
char *acpiset;/* name of the ACPI get function */
int min; /* minimum allowed value or -1 */
int max; /* maximum allowed value or -1 */
int value; /* current setting */
int valid; /* Has ever been set */
int debug; /* active only in debug mode ? */
} sony_acpi_values[] = {
{
.name = "brightness_default",
.acpiget = "GPBR",
.acpiset = "SPBR",
.min = 1,
.max = SONY_MAX_BRIGHTNESS,
.debug = 0,
},
{
.name = "fnkey",
.acpiget = "GHKE",
.debug = 0,
},
{
.name = "cdpower",
.acpiget = "GCDP",
.acpiset = "SCDP",
.min = -1,
.max = -1,
.debug = 0,
},
{
.name = "PID",
.acpiget = "GPID",
.debug = 1,
},
{
.name = "CTR",
.acpiget = "GCTR",
.acpiset = "SCTR",
.min = -1,
.max = -1,
.debug = 1,
},
{
.name = "PCR",
.acpiget = "GPCR",
.acpiset = "SPCR",
.min = -1,
.max = -1,
.debug = 1,
},
{
.name = "CMI",
.acpiget = "GCMI",
.acpiset = "SCMI",
.min = -1,
.max = -1,
.debug = 1,
},
{
.name = NULL,
}
};
static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
{
struct acpi_buffer output;
union acpi_object out_obj;
acpi_status status;
output.length = sizeof(out_obj);
output.pointer = &out_obj;
status = acpi_evaluate_object(handle, name, NULL, &output);
if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
*result = out_obj.integer.value;
return 0;
}
printk(LOG_PFX "acpi_callreadfunc failed\n");
return -1;
}
static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
int *result)
{
struct acpi_object_list params;
union acpi_object in_obj;
struct acpi_buffer output;
union acpi_object out_obj;
acpi_status status;
params.count = 1;
params.pointer = &in_obj;
in_obj.type = ACPI_TYPE_INTEGER;
in_obj.integer.value = value;
output.length = sizeof(out_obj);
output.pointer = &out_obj;
status = acpi_evaluate_object(handle, name, &params, &output);
if (status == AE_OK) {
if (result != NULL) {
if (out_obj.type != ACPI_TYPE_INTEGER) {
printk(LOG_PFX "acpi_evaluate_object bad "
"return type\n");
return -1;
}
*result = out_obj.integer.value;
}
return 0;
}
printk(LOG_PFX "acpi_evaluate_object failed\n");
return -1;
}
static int parse_buffer(const char __user *buffer, unsigned long count,
int *val) {
char s[32];
int ret;
if (count > 31)
return -EINVAL;
if (copy_from_user(s, buffer, count))
return -EFAULT;
s[count] = '\0';
ret = simple_strtoul(s, NULL, 10);
*val = ret;
return 0;
}
static int sony_acpi_read(char* page, char** start, off_t off, int count,
int* eof, void *data)
{
struct sony_acpi_value *item = data;
int value;
if (!item->acpiget)
return -EIO;
if (acpi_callgetfunc(sony_acpi_handle, item->acpiget, &value) < 0)
return -EIO;
return sprintf(page, "%d\n", value);
}
static int sony_acpi_write(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
struct sony_acpi_value *item = data;
int result;
int value;
if (!item->acpiset)
return -EIO;
if ((result = parse_buffer(buffer, count, &value)) < 0)
return result;
if (item->min != -1 && value < item->min)
return -EINVAL;
if (item->max != -1 && value > item->max)
return -EINVAL;
if (acpi_callsetfunc(sony_acpi_handle, item->acpiset, value, NULL) < 0)
return -EIO;
item->value = value;
item->valid = 1;
return count;
}
static int sony_acpi_resume(struct acpi_device *device)
{
struct sony_acpi_value *item;
for (item = sony_acpi_values; item->name; item++) {
int ret;
if (!item->valid)
continue;
ret = acpi_callsetfunc(sony_acpi_handle, item->acpiset,
item->value, NULL);
if (ret < 0) {
printk("%s: %d\n", __FUNCTION__, ret);
break;
}
}
return 0;
}
static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
{
printk(LOG_PFX "sony_acpi_notify\n");
}
static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
void *context, void **return_value)
{
struct acpi_namespace_node *node;
union acpi_operand_object *operand;
node = (struct acpi_namespace_node *) handle;
operand = (union acpi_operand_object *) node->object;
printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
(u32) operand->method.param_count);
return AE_OK;
}
static int sony_acpi_add(struct acpi_device *device)
{
acpi_status status;
int result;
acpi_handle handle;
struct sony_acpi_value *item;
sony_acpi_handle = device->handle;
acpi_driver_data(device) = NULL;
acpi_device_dir(device) = sony_acpi_dir;
if (debug) {
status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_acpi_handle,
1, sony_walk_callback, NULL, NULL);
if (ACPI_FAILURE(status)) {
printk(LOG_PFX "unable to walk acpi resources\n");
result = -ENODEV;
goto outwalk;
}
status = acpi_install_notify_handler(sony_acpi_handle,
ACPI_DEVICE_NOTIFY,
sony_acpi_notify,
NULL);
if (ACPI_FAILURE(status)) {
printk(LOG_PFX "unable to install notify handler\n");
result = -ENODEV;
goto outnotify;
}
}
if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle, "GBRT", &handle))) {
sony_backlight_device = backlight_device_register("sony", NULL,
&sony_backlight_properties);
if (IS_ERR(sony_backlight_device)) {
printk(LOG_PFX "unable to register backlight device\n");
}
}
for (item = sony_acpi_values; item->name; ++item) {
if (!debug && item->debug)
continue;
if (item->acpiget &&
ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
item->acpiget, &handle)))
continue;
if (item->acpiset &&
ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
item->acpiset, &handle)))
continue;
item->proc = create_proc_entry(item->name, 0600,
acpi_device_dir(device));
if (!item->proc) {
printk(LOG_PFX "unable to create proc entry\n");
result = -EIO;
goto outproc;
}
item->proc->read_proc = sony_acpi_read;
item->proc->write_proc = sony_acpi_write;
item->proc->data = item;
item->proc->owner = THIS_MODULE;
}
printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");
return 0;
outproc:
if (debug) {
status = acpi_remove_notify_handler(sony_acpi_handle,
ACPI_DEVICE_NOTIFY,
sony_acpi_notify);
if (ACPI_FAILURE(status))
printk(LOG_PFX "unable to remove notify handler\n");
}
outnotify:
for (item = sony_acpi_values; item->name; ++item)
if (item->proc)
remove_proc_entry(item->name, acpi_device_dir(device));
outwalk:
return result;
}
static int sony_acpi_remove(struct acpi_device *device, int type)
{
acpi_status status;
struct sony_acpi_value *item;
if (sony_backlight_device)
backlight_device_unregister(sony_backlight_device);
if (debug) {
status = acpi_remove_notify_handler(sony_acpi_handle,
ACPI_DEVICE_NOTIFY,
sony_acpi_notify);
if (ACPI_FAILURE(status))
printk(LOG_PFX "unable to remove notify handler\n");
}
for (item = sony_acpi_values; item->name; ++item)
if (item->proc)
remove_proc_entry(item->name, acpi_device_dir(device));
printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");
return 0;
}
static int sony_backlight_update_status(struct backlight_device *bd)
{
return acpi_callsetfunc(sony_acpi_handle, "SBRT",
bd->props->brightness + 1,
NULL);
}
static int sony_backlight_get_brightness(struct backlight_device *bd)
{
int value;
if (acpi_callgetfunc(sony_acpi_handle, "GBRT", &value))
return 0;
/* brightness levels are 1-based, while backlight ones are 0-based */
return value - 1;
}
static struct acpi_driver sony_acpi_driver = {
.name = ACPI_SNC_DRIVER_NAME,
.class = ACPI_SNC_CLASS,
.ids = ACPI_SNC_HID,
.ops = {
.add = sony_acpi_add,
.remove = sony_acpi_remove,
.resume = sony_acpi_resume,
},
};
static int __init sony_acpi_init(void)
{
int result;
sony_acpi_dir = proc_mkdir("sony", acpi_root_dir);
if (!sony_acpi_dir) {
printk(LOG_PFX "unable to create /proc entry\n");
return -ENODEV;
}
sony_acpi_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&sony_acpi_driver);
if (result < 0) {
remove_proc_entry("sony", acpi_root_dir);
return -ENODEV;
}
return 0;
}
static void __exit sony_acpi_exit(void)
{
acpi_bus_unregister_driver(&sony_acpi_driver);
remove_proc_entry("sony", acpi_root_dir);
}
module_init(sony_acpi_init);
module_exit(sony_acpi_exit);