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>

3 files changed, 69 insertions, 127 deletions

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 6efbb7ec0e2d..7133af824b5e 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -134,6 +134,13 @@ static inline void lp5521_wait_enable_done(void)
         usleep_range(500, 600);
 }
 
+static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+        led->led_current = led_current;
+        lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
+                led_current);
+}
+
 static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
 {
         return container_of(cdev, struct lp5521_led, cdev);
@@ -229,13 +236,6 @@ static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
         return lp5521_write(client, LP5521_REG_OP_MODE, mode);
 }
 
-static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
-{
-        return lp5521_write(chip->client,
-                    LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
-                    curr);
-}
-
 static int lp5521_post_init_device(struct lp55xx_chip *chip)
 {
         int ret;
@@ -462,54 +462,6 @@ store_mode(1)
 store_mode(2)
 store_mode(3)
 
-static ssize_t show_max_current(struct device *dev,
-                            struct device_attribute *attr,
-                            char *buf)
-{
-        struct led_classdev *led_cdev = dev_get_drvdata(dev);
-        struct lp5521_led *led = cdev_to_led(led_cdev);
-
-        return sprintf(buf, "%d\n", led->max_current);
-}
-
-static ssize_t show_current(struct device *dev,
-                            struct device_attribute *attr,
-                            char *buf)
-{
-        struct led_classdev *led_cdev = dev_get_drvdata(dev);
-        struct lp5521_led *led = cdev_to_led(led_cdev);
-
-        return sprintf(buf, "%d\n", led->led_current);
-}
-
-static ssize_t store_current(struct device *dev,
-                             struct device_attribute *attr,
-                             const char *buf, size_t len)
-{
-        struct led_classdev *led_cdev = dev_get_drvdata(dev);
-        struct lp5521_led *led = cdev_to_led(led_cdev);
-        struct lp5521_chip *chip = led_to_lp5521(led);
-        ssize_t ret;
-        unsigned long curr;
-
-        if (kstrtoul(buf, 0, &curr))
-                return -EINVAL;
-
-        if (curr > led->max_current)
-                return -EINVAL;
-
-        mutex_lock(&chip->lock);
-        ret = lp5521_set_led_current(chip, led->id, curr);
-        mutex_unlock(&chip->lock);
-
-        if (ret < 0)
-                return ret;
-
-        led->led_current = (u8)curr;
-
-        return len;
-}
-
 static ssize_t lp5521_selftest(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
@@ -615,18 +567,7 @@ static ssize_t store_led_pattern(struct device *dev,
         return len;
 }
 
-/* led class device attributes */
-static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
-static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
-
-static struct attribute *lp5521_led_attributes[] = {
-        &dev_attr_led_current.attr,
-        &dev_attr_max_current.attr,
-        NULL,
-};
-
 static struct attribute_group lp5521_led_attribute_group = {
-        .attrs = lp5521_led_attributes
 };
 
 /* device attributes */
@@ -700,6 +641,7 @@ static struct lp55xx_device_config lp5521_cfg = {
         .max_channel  = LP5521_MAX_LEDS,
         .post_init_device   = lp5521_post_init_device,
         .brightness_work_fn = lp5521_led_brightness_work,
+        .set_led_current    = lp5521_set_led_current,
 };
 
 static int lp5521_probe(struct i2c_client *client,
diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
index 43db2429616b..dfb335420568 100644
--- a/drivers/leds/leds-lp5523.c
+++ b/drivers/leds/leds-lp5523.c
@@ -142,6 +142,13 @@ struct lp5523_chip {
         u8                      num_leds;
 };
 
+static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+        led->led_current = led_current;
+        lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
+                led_current);
+}
+
 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
 {
         return container_of(cdev, struct lp5523_led, cdev);
@@ -602,68 +609,7 @@ store_mode(1)
 store_mode(2)
 store_mode(3)
 
-static ssize_t show_max_current(struct device *dev,
-                            struct device_attribute *attr,
-                            char *buf)
-{
-        struct led_classdev *led_cdev = dev_get_drvdata(dev);
-        struct lp5523_led *led = cdev_to_led(led_cdev);
-
-        return sprintf(buf, "%d\n", led->max_current);
-}
-
-static ssize_t show_current(struct device *dev,
-                            struct device_attribute *attr,
-                            char *buf)
-{
-        struct led_classdev *led_cdev = dev_get_drvdata(dev);
-        struct lp5523_led *led = cdev_to_led(led_cdev);
-
-        return sprintf(buf, "%d\n", led->led_current);
-}
-
-static ssize_t store_current(struct device *dev,
-                             struct device_attribute *attr,
-                             const char *buf, size_t len)
-{
-        struct led_classdev *led_cdev = dev_get_drvdata(dev);
-        struct lp5523_led *led = cdev_to_led(led_cdev);
-        struct lp5523_chip *chip = led_to_lp5523(led);
-        ssize_t ret;
-        unsigned long curr;
-
-        if (kstrtoul(buf, 0, &curr))
-                return -EINVAL;
-
-        if (curr > led->max_current)
-                return -EINVAL;
-
-        mutex_lock(&chip->lock);
-        ret = lp5523_write(chip->client,
-                        LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
-                        (u8)curr);
-        mutex_unlock(&chip->lock);
-
-        if (ret < 0)
-                return ret;
-
-        led->led_current = (u8)curr;
-
-        return len;
-}
-
-/* led class device attributes */
-static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
-static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
-
-static struct attribute *lp5523_led_attributes[] = {
-        &dev_attr_led_current.attr,
-        &dev_attr_max_current.attr,
-        NULL,
-};
-
 static struct attribute_group lp5523_led_attribute_group = {
-        .attrs = lp5523_led_attributes
 };
 
 /* device attributes */
@@ -780,6 +726,7 @@ static struct lp55xx_device_config lp5523_cfg = {
         .max_channel  = LP5523_MAX_LEDS,
         .post_init_device   = lp5523_post_init_device,
         .brightness_work_fn = lp5523_led_brightness_work,
+        .set_led_current    = lp5523_set_led_current,
 };
 
 static int lp5523_probe(struct i2c_client *client,
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,
 };