Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 702ed512 authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

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: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarThomas Sujith <sujith.thomas@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent d9460fd2

drivers/acpi/video.c

+77 −1
Original line number Diff line number Diff line
@@ -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;