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
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d9460fd227
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702ed512de
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@ -34,6 +34,7 @@
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#include <linux/seq_file.h>
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#include <linux/seq_file.h>
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#include <linux/input.h>
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#include <linux/input.h>
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#include <linux/backlight.h>
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#include <linux/backlight.h>
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#include <linux/thermal.h>
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#include <linux/video_output.h>
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#include <linux/video_output.h>
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#include <asm/uaccess.h>
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#include <asm/uaccess.h>
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@ -179,6 +180,7 @@ struct acpi_video_device {
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struct acpi_device *dev;
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struct acpi_device *dev;
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struct acpi_video_device_brightness *brightness;
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struct acpi_video_device_brightness *brightness;
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struct backlight_device *backlight;
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struct backlight_device *backlight;
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struct thermal_cooling_device *cdev;
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struct output_device *output_dev;
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struct output_device *output_dev;
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};
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};
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@ -334,6 +336,54 @@ static struct output_properties acpi_output_properties = {
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.set_state = acpi_video_output_set,
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.set_state = acpi_video_output_set,
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.get_status = acpi_video_output_get,
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.get_status = acpi_video_output_get,
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};
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};
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/* thermal cooling device callbacks */
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static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_video_device *video = acpi_driver_data(device);
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return sprintf(buf, "%d\n", video->brightness->count - 3);
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}
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static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_video_device *video = acpi_driver_data(device);
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unsigned long level;
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int state;
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acpi_video_device_lcd_get_level_current(video, &level);
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for (state = 2; state < video->brightness->count; state++)
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if (level == video->brightness->levels[state])
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return sprintf(buf, "%d\n",
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video->brightness->count - state - 1);
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return -EINVAL;
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}
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static int
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video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_video_device *video = acpi_driver_data(device);
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int level;
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if ( state >= video->brightness->count - 2)
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return -EINVAL;
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state = video->brightness->count - state;
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level = video->brightness->levels[state -1];
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return acpi_video_device_lcd_set_level(video, level);
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}
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static struct thermal_cooling_device_ops video_cooling_ops = {
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.get_max_state = video_get_max_state,
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.get_cur_state = video_get_cur_state,
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.set_cur_state = video_set_cur_state,
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};
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/* --------------------------------------------------------------------------
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/* --------------------------------------------------------------------------
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Video Management
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Video Management
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-------------------------------------------------------------------------- */
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-------------------------------------------------------------------------- */
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@ -653,6 +703,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
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if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
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if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
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unsigned long tmp;
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unsigned long tmp;
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int result;
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static int count = 0;
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static int count = 0;
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char *name;
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char *name;
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name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
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name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
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@ -666,8 +717,25 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
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device->backlight->props.max_brightness = max_level;
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device->backlight->props.max_brightness = max_level;
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device->backlight->props.brightness = (int)tmp;
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device->backlight->props.brightness = (int)tmp;
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backlight_update_status(device->backlight);
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backlight_update_status(device->backlight);
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kfree(name);
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kfree(name);
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device->cdev = thermal_cooling_device_register("LCD",
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device->dev, &video_cooling_ops);
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if (device->cdev) {
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printk(KERN_INFO PREFIX
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"%s is registered as cooling_device%d\n",
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device->dev->dev.bus_id, device->cdev->id);
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result = sysfs_create_link(&device->dev->dev.kobj,
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&device->cdev->device.kobj,
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"thermal_cooling");
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if (result)
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printk(KERN_ERR PREFIX "Create sysfs link\n");
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result = sysfs_create_link(&device->cdev->device.kobj,
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&device->dev->dev.kobj,
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"device");
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if (result)
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printk(KERN_ERR PREFIX "Create sysfs link\n");
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}
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}
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}
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if (device->cap._DCS && device->cap._DSS){
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if (device->cap._DCS && device->cap._DSS){
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static int count = 0;
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static int count = 0;
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@ -1729,6 +1797,14 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
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ACPI_DEVICE_NOTIFY,
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ACPI_DEVICE_NOTIFY,
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acpi_video_device_notify);
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acpi_video_device_notify);
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backlight_device_unregister(device->backlight);
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backlight_device_unregister(device->backlight);
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if (device->cdev) {
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sysfs_remove_link(&device->dev->dev.kobj,
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"thermal_cooling");
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sysfs_remove_link(&device->cdev->device.kobj,
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"device");
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thermal_cooling_device_unregister(device->cdev);
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device->cdev = NULL;
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}
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video_output_unregister(device->output_dev);
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video_output_unregister(device->output_dev);
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return 0;
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return 0;
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