diff options
author | Zhang Rui <rui.zhang@intel.com> | 2017-07-20 10:22:47 +0800 |
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committer | Zhang Rui <rui.zhang@intel.com> | 2017-09-01 09:03:29 +0800 |
commit | 9ef08d7a4438bb85856ee158f2b5e3e02c479279 (patch) | |
tree | fbe3c2e439b8b786ae6a8757be46692aaa57fd62 /drivers/thermal | |
parent | 595536e0b2475a9eac23709cd461143178c12e0e (diff) | |
download | op-kernel-dev-9ef08d7a4438bb85856ee158f2b5e3e02c479279.zip op-kernel-dev-9ef08d7a4438bb85856ee158f2b5e3e02c479279.tar.gz |
Thermal: int3406_thermal: fix thermal sysfs I/F
there are three concepts represent backlight in int3406_thermal driver.
1. the raw brightness value from native graphics driver.
2. the percentage numbers from ACPI _BCL control method.
3. the consecutive numbers represent cooling states.
int3406_thermal driver
1. uses value from DDDL/DDPC as the lower/upper limit, which is consistent
with ACPI _BCL control methods.
2. reads current and maximum brightness from the native graphics driver.
3. expose them to thermal sysfs I/F
This patch fixes the code that switches between the raw brightness value
and the cooling state, which results in bogus value in thermal sysfs I/F.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r-- | drivers/thermal/int340x_thermal/int3406_thermal.c | 96 |
1 files changed, 37 insertions, 59 deletions
diff --git a/drivers/thermal/int340x_thermal/int3406_thermal.c b/drivers/thermal/int340x_thermal/int3406_thermal.c index 1891f34..f69ab02 100644 --- a/drivers/thermal/int340x_thermal/int3406_thermal.c +++ b/drivers/thermal/int340x_thermal/int3406_thermal.c @@ -21,39 +21,33 @@ struct int3406_thermal_data { int upper_limit; - int upper_limit_index; int lower_limit; - int lower_limit_index; acpi_handle handle; struct acpi_video_device_brightness *br; struct backlight_device *raw_bd; struct thermal_cooling_device *cooling_dev; }; -static int int3406_thermal_to_raw(int level, struct int3406_thermal_data *d) -{ - int max_level = d->br->levels[d->br->count - 1]; - int raw_max = d->raw_bd->props.max_brightness; - - return level * raw_max / max_level; -} - -static int int3406_thermal_to_acpi(int level, struct int3406_thermal_data *d) -{ - int raw_max = d->raw_bd->props.max_brightness; - int max_level = d->br->levels[d->br->count - 1]; - - return level * max_level / raw_max; -} +/* + * According to the ACPI spec, + * "Each brightness level is represented by a number between 0 and 100, + * and can be thought of as a percentage. For example, 50 can be 50% + * power consumption or 50% brightness, as defined by the OEM." + * + * As int3406 device uses this value to communicate with the native + * graphics driver, we make the assumption that it represents + * the percentage of brightness only + */ +#define ACPI_TO_RAW(v, d) (d->raw_bd->props.max_brightness * v / 100) +#define RAW_TO_ACPI(v, d) (v * 100 / d->raw_bd->props.max_brightness) static int int3406_thermal_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned long *state) { struct int3406_thermal_data *d = cooling_dev->devdata; - int index = d->lower_limit_index ? d->lower_limit_index : 2; - *state = d->br->count - 1 - index; + *state = d->upper_limit - d->lower_limit; return 0; } @@ -62,19 +56,15 @@ int3406_thermal_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) { struct int3406_thermal_data *d = cooling_dev->devdata; - int level, raw_level; + int acpi_level, raw_level; - if (state > d->br->count - 3) + if (state > d->upper_limit - d->lower_limit) return -EINVAL; - state = d->br->count - 1 - state; - level = d->br->levels[state]; + acpi_level = d->br->levels[d->upper_limit - state]; - if ((d->upper_limit && level > d->upper_limit) || - (d->lower_limit && level < d->lower_limit)) - return -EINVAL; + raw_level = ACPI_TO_RAW(acpi_level, d); - raw_level = int3406_thermal_to_raw(level, d); return backlight_device_set_brightness(d->raw_bd, raw_level); } @@ -83,27 +73,22 @@ int3406_thermal_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long *state) { struct int3406_thermal_data *d = cooling_dev->devdata; - int raw_level, level, i; - int *levels = d->br->levels; + int acpi_level; + int index; - raw_level = d->raw_bd->props.brightness; - level = int3406_thermal_to_acpi(raw_level, d); + acpi_level = RAW_TO_ACPI(d->raw_bd->props.brightness, d); /* - * There is no 1:1 mapping between the firmware interface level with the - * raw interface level, we will have to find one that is close enough. + * There is no 1:1 mapping between the firmware interface level + * with the raw interface level, we will have to find one that is + * right above it. */ - for (i = 2; i < d->br->count; i++) { - if (level < levels[i]) { - if (i == 2) - break; - if ((level - levels[i - 1]) < (levels[i] - level)) - i--; + for (index = d->lower_limit; index < d->upper_limit; index++) { + if (acpi_level <= d->br->levels[index]) break; - } } - *state = d->br->count - 1 - i; + *state = d->upper_limit - index; return 0; } @@ -117,7 +102,7 @@ static int int3406_thermal_get_index(int *array, int nr, int value) { int i; - for (i = 0; i < nr; i++) { + for (i = 2; i < nr; i++) { if (array[i] == value) break; } @@ -128,27 +113,20 @@ static void int3406_thermal_get_limit(struct int3406_thermal_data *d) { acpi_status status; unsigned long long lower_limit, upper_limit; - int index; status = acpi_evaluate_integer(d->handle, "DDDL", NULL, &lower_limit); - if (ACPI_SUCCESS(status)) { - index = int3406_thermal_get_index(d->br->levels, d->br->count, - lower_limit); - if (index > 0) { - d->lower_limit = (int)lower_limit; - d->lower_limit_index = index; - } - } + if (ACPI_SUCCESS(status)) + d->lower_limit = int3406_thermal_get_index(d->br->levels, + d->br->count, lower_limit); status = acpi_evaluate_integer(d->handle, "DDPC", NULL, &upper_limit); - if (ACPI_SUCCESS(status)) { - index = int3406_thermal_get_index(d->br->levels, d->br->count, - upper_limit); - if (index > 0) { - d->upper_limit = (int)upper_limit; - d->upper_limit_index = index; - } - } + if (ACPI_SUCCESS(status)) + d->upper_limit = int3406_thermal_get_index(d->br->levels, + d->br->count, upper_limit); + + /* lower_limit and upper_limit should be always set */ + d->lower_limit = d->lower_limit > 0 ? d->lower_limit : 2; + d->upper_limit = d->upper_limit > 0 ? d->upper_limit : d->br->count - 1; } static void int3406_notify(acpi_handle handle, u32 event, void *data) |