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| author | Mohan Pallaka <mpallaka@codeaurora.org> | 2015-02-23 16:41:47 -0800 |
|---|---|---|
| committer | Kyle Yan <kyan@codeaurora.org> | 2016-05-31 15:27:35 -0700 |
| commit | a5035ab8093bd613943c60440c558712093223f8 (patch) | |
| tree | 07b397aa75936f8ada2609b514d5095ea15ad4e5 | |
| parent | 9e6c849ebb600114999c387005c7ea238b776403 (diff) | |
leds: led-class: add support for max_brightness store
Add store interface for max_brightness to allow users
to change the maximum brightness to be supported by
the hardware.
Change-Id: I8b65debdc52ded24227483c4db21aaec63e27927
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
| -rw-r--r-- | drivers/leds/led-class.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 7385f98dd54b..960bf2f901d2 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -71,7 +71,24 @@ static ssize_t max_brightness_show(struct device *dev, return sprintf(buf, "%u\n", led_cdev->max_brightness); } -static DEVICE_ATTR_RO(max_brightness); + +static ssize_t max_brightness_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + unsigned long state; + ssize_t ret = -EINVAL; + + ret = kstrtoul(buf, 10, &state); + if (ret) + return ret; + + led_cdev->max_brightness = state; + led_set_brightness(led_cdev, led_cdev->brightness); + + return size; +} +static DEVICE_ATTR_RW(max_brightness); #ifdef CONFIG_LEDS_TRIGGERS static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |