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authorZhang Rui <rui.zhang@intel.com>2008-01-17 02:51:22 -0500
committerLen Brown <len.brown@intel.com>2008-02-01 23:18:33 -0500
commit702ed512de9c8a67a69a981c73b7337c2131f198 (patch)
tree58ac1266d3e13ae1fcd89e947d19dbf30285e019 /drivers/acpi
parentd9460fd227ed2ce52941b6a12ad4de05c195f6aa (diff)
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/video.c78
1 files changed, 77 insertions, 1 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index bd77e81e81c1..eab9c4213b49 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -34,6 +34,7 @@
34#include <linux/seq_file.h> 34#include <linux/seq_file.h>
35#include <linux/input.h> 35#include <linux/input.h>
36#include <linux/backlight.h> 36#include <linux/backlight.h>
37#include <linux/thermal.h>
37#include <linux/video_output.h> 38#include <linux/video_output.h>
38#include <asm/uaccess.h> 39#include <asm/uaccess.h>
39 40
@@ -179,6 +180,7 @@ struct acpi_video_device {
179 struct acpi_device *dev; 180 struct acpi_device *dev;
180 struct acpi_video_device_brightness *brightness; 181 struct acpi_video_device_brightness *brightness;
181 struct backlight_device *backlight; 182 struct backlight_device *backlight;
183 struct thermal_cooling_device *cdev;
182 struct output_device *output_dev; 184 struct output_device *output_dev;
183}; 185};
184 186
@@ -334,6 +336,54 @@ static struct output_properties acpi_output_properties = {
334 .set_state = acpi_video_output_set, 336 .set_state = acpi_video_output_set,
335 .get_status = acpi_video_output_get, 337 .get_status = acpi_video_output_get,
336}; 338};
339
340
341/* thermal cooling device callbacks */
342static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
343{
344 struct acpi_device *device = cdev->devdata;
345 struct acpi_video_device *video = acpi_driver_data(device);
346
347 return sprintf(buf, "%d\n", video->brightness->count - 3);
348}
349
350static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
351{
352 struct acpi_device *device = cdev->devdata;
353 struct acpi_video_device *video = acpi_driver_data(device);
354 unsigned long level;
355 int state;
356
357 acpi_video_device_lcd_get_level_current(video, &level);
358 for (state = 2; state < video->brightness->count; state++)
359 if (level == video->brightness->levels[state])
360 return sprintf(buf, "%d\n",
361 video->brightness->count - state - 1);
362
363 return -EINVAL;
364}
365
366static int
367video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
368{
369 struct acpi_device *device = cdev->devdata;
370 struct acpi_video_device *video = acpi_driver_data(device);
371 int level;
372
373 if ( state >= video->brightness->count - 2)
374 return -EINVAL;
375
376 state = video->brightness->count - state;
377 level = video->brightness->levels[state -1];
378 return acpi_video_device_lcd_set_level(video, level);
379}
380
381static struct thermal_cooling_device_ops video_cooling_ops = {
382 .get_max_state = video_get_max_state,
383 .get_cur_state = video_get_cur_state,
384 .set_cur_state = video_set_cur_state,
385};
386
337/* -------------------------------------------------------------------------- 387/* --------------------------------------------------------------------------
338 Video Management 388 Video Management
339 -------------------------------------------------------------------------- */ 389 -------------------------------------------------------------------------- */
@@ -653,6 +703,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
653 703
654 if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){ 704 if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
655 unsigned long tmp; 705 unsigned long tmp;
706 int result;
656 static int count = 0; 707 static int count = 0;
657 char *name; 708 char *name;
658 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL); 709 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
@@ -666,8 +717,25 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
666 device->backlight->props.max_brightness = max_level; 717 device->backlight->props.max_brightness = max_level;
667 device->backlight->props.brightness = (int)tmp; 718 device->backlight->props.brightness = (int)tmp;
668 backlight_update_status(device->backlight); 719 backlight_update_status(device->backlight);
669
670 kfree(name); 720 kfree(name);
721
722 device->cdev = thermal_cooling_device_register("LCD",
723 device->dev, &video_cooling_ops);
724 if (device->cdev) {
725 printk(KERN_INFO PREFIX
726 "%s is registered as cooling_device%d\n",
727 device->dev->dev.bus_id, device->cdev->id);
728 result = sysfs_create_link(&device->dev->dev.kobj,
729 &device->cdev->device.kobj,
730 "thermal_cooling");
731 if (result)
732 printk(KERN_ERR PREFIX "Create sysfs link\n");
733 result = sysfs_create_link(&device->cdev->device.kobj,
734 &device->dev->dev.kobj,
735 "device");
736 if (result)
737 printk(KERN_ERR PREFIX "Create sysfs link\n");
738 }
671 } 739 }
672 if (device->cap._DCS && device->cap._DSS){ 740 if (device->cap._DCS && device->cap._DSS){
673 static int count = 0; 741 static int count = 0;
@@ -1729,6 +1797,14 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1729 ACPI_DEVICE_NOTIFY, 1797 ACPI_DEVICE_NOTIFY,
1730 acpi_video_device_notify); 1798 acpi_video_device_notify);
1731 backlight_device_unregister(device->backlight); 1799 backlight_device_unregister(device->backlight);
1800 if (device->cdev) {
1801 sysfs_remove_link(&device->dev->dev.kobj,
1802 "thermal_cooling");
1803 sysfs_remove_link(&device->cdev->device.kobj,
1804 "device");
1805 thermal_cooling_device_unregister(device->cdev);
1806 device->cdev = NULL;
1807 }
1732 video_output_unregister(device->output_dev); 1808 video_output_unregister(device->output_dev);
1733 1809
1734 return 0; 1810 return 0;