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ACPI: register ACPI Video LCD as generic thermal cooling device 

Register ACPI video device as thermal cooling devices as they may be listed
in _TZD method and the backlight control can be used for throttling.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Thomas Sujith <sujith.thomas@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Zhang Rui 2008-01-17 15:51:22 +08:00 committed by Len Brown
parent d9460fd227
commit 702ed512de
1 changed files with 77 additions and 1 deletions
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78
drivers/acpi/video.c
View File

@ -34,6 +34,7 @@
#include <linux/seq_file.h>
#include <linux/input.h>
#include <linux/backlight.h>
#include <linux/thermal.h>
#include <linux/video_output.h>
#include <asm/uaccess.h>
@ -179,6 +180,7 @@ struct acpi_video_device {
struct acpi_device *dev;
struct acpi_video_device_brightness *brightness;
struct backlight_device *backlight;
struct thermal_cooling_device *cdev;
struct output_device *output_dev;
};
@ -334,6 +336,54 @@ static struct output_properties acpi_output_properties = {
.set_state = acpi_video_output_set,
.get_status = acpi_video_output_get,
};
/* thermal cooling device callbacks */
static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
return sprintf(buf, "%d\n", video->brightness->count - 3);
}
static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
unsigned long level;
int state;
acpi_video_device_lcd_get_level_current(video, &level);
for (state = 2; state < video->brightness->count; state++)
if (level == video->brightness->levels[state])
return sprintf(buf, "%d\n",
video->brightness->count - state - 1);
return -EINVAL;
}
static int
video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
int level;
if ( state >= video->brightness->count - 2)
return -EINVAL;
state = video->brightness->count - state;
level = video->brightness->levels[state -1];
return acpi_video_device_lcd_set_level(video, level);
}
static struct thermal_cooling_device_ops video_cooling_ops = {
.get_max_state = video_get_max_state,
.get_cur_state = video_get_cur_state,
.set_cur_state = video_set_cur_state,
};
/* --------------------------------------------------------------------------
Video Management
-------------------------------------------------------------------------- */
@ -653,6 +703,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
unsigned long tmp;
int result;
static int count = 0;
char *name;
name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
@ -666,8 +717,25 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
device->backlight->props.max_brightness = max_level;
device->backlight->props.brightness = (int)tmp;
backlight_update_status(device->backlight);
kfree(name);
device->cdev = thermal_cooling_device_register("LCD",
device->dev, &video_cooling_ops);
if (device->cdev) {
printk(KERN_INFO PREFIX
"%s is registered as cooling_device%d\n",
device->dev->dev.bus_id, device->cdev->id);
result = sysfs_create_link(&device->dev->dev.kobj,
&device->cdev->device.kobj,
"thermal_cooling");
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\n");
result = sysfs_create_link(&device->cdev->device.kobj,
&device->dev->dev.kobj,
"device");
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\n");
}
}
if (device->cap._DCS && device->cap._DSS){
static int count = 0;
@ -1729,6 +1797,14 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
ACPI_DEVICE_NOTIFY,
acpi_video_device_notify);
backlight_device_unregister(device->backlight);
if (device->cdev) {
sysfs_remove_link(&device->dev->dev.kobj,
"thermal_cooling");
sysfs_remove_link(&device->cdev->device.kobj,
"device");
thermal_cooling_device_unregister(device->cdev);
device->cdev = NULL;
}
video_output_unregister(device->output_dev);
return 0;