diff options
author | Zhang Rui <rui.zhang@intel.com> | 2008-01-17 15:51:22 +0800 |
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committer | Len Brown <len.brown@intel.com> | 2008-02-01 23:18:33 -0500 |
commit | 702ed512de9c8a67a69a981c73b7337c2131f198 (patch) | |
tree | 58ac1266d3e13ae1fcd89e947d19dbf30285e019 /drivers/acpi | |
parent | d9460fd227ed2ce52941b6a12ad4de05c195f6aa (diff) | |
download | op-kernel-dev-702ed512de9c8a67a69a981c73b7337c2131f198.zip op-kernel-dev-702ed512de9c8a67a69a981c73b7337c2131f198.tar.gz |
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.c | 78 |
1 files changed, 77 insertions, 1 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index bd77e81..eab9c42 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -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; |