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authorMilo(Woogyom) Kim <milo.kim@ti.com>2013-02-05 14:09:32 +0400
committerBryan Wu <cooloney@gmail.com>2013-02-07 03:59:28 +0400
commita96bfa135ddc8045166fc6311ce4d21bfcb8d13d (patch)
tree405bc5264b0b09af0d77db11cdae2923279db188 /drivers/leds/leds-lp55xx-common.c
parenta6e4679a09a0a2bcfa63074272fc9fb2a40f11ad (diff)
downloadlinux-a96bfa135ddc8045166fc6311ce4d21bfcb8d13d.tar.xz
leds-lp55xx: provide common LED current setting
LED current is configurable via the sysfs. Max current is a read-only attribute. These attributes code can be shared in lp55xx common driver. Device attributes: 'led_current' and 'max_current' move to lp55xx common driver Replaced functions: show_max_current() => lp55xx_show_max_current() show_current() => lp55xx_show_current() store_current() => lp55xx_store_current() LED setting function: set_led_current() Current registers are device specific, so configurable function is added in each driver. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds/leds-lp55xx-common.c')
-rw-r--r--drivers/leds/leds-lp55xx-common.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index 8244d78447f4..6b3d03709f5f 100644
--- a/drivers/leds/leds-lp55xx-common.c
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -25,6 +25,11 @@ static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
return container_of(cdev, struct lp55xx_led, cdev);
}
+static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
+{
+ return cdev_to_lp55xx_led(dev_get_drvdata(dev));
+}
+
static void lp55xx_reset_device(struct lp55xx_chip *chip)
{
struct lp55xx_device_config *cfg = chip->cfg;
@@ -68,7 +73,55 @@ static int lp55xx_post_init_device(struct lp55xx_chip *chip)
return cfg->post_init_device(chip);
}
+static ssize_t lp55xx_show_current(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+
+ return sprintf(buf, "%d\n", led->led_current);
+}
+
+static ssize_t lp55xx_store_current(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+ struct lp55xx_chip *chip = led->chip;
+ unsigned long curr;
+
+ if (kstrtoul(buf, 0, &curr))
+ return -EINVAL;
+
+ if (curr > led->max_current)
+ return -EINVAL;
+
+ if (!chip->cfg->set_led_current)
+ return len;
+
+ mutex_lock(&chip->lock);
+ chip->cfg->set_led_current(led, (u8)curr);
+ mutex_unlock(&chip->lock);
+
+ return len;
+}
+
+static ssize_t lp55xx_show_max_current(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+
+ return sprintf(buf, "%d\n", led->max_current);
+}
+
+static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, lp55xx_show_current,
+ lp55xx_store_current);
+static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
+
static struct attribute *lp55xx_led_attributes[] = {
+ &dev_attr_led_current.attr,
+ &dev_attr_max_current.attr,
NULL,
};