leds: leds-lp55xx: Generalize led_brightness function

Generalize led_brightness function as the implementation is the same for
most of the lp55xx based LED driver.

Introduce a new option in device_config, reg_led_pwm_base since the reg
value is not the same for every LED chip.

Suggested-by: Lee Jones <lee@kernel.org>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20240626160027.19703-11-ansuelsmth@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: Ansuel

drivers/leds/leds-lp5521.c

@@ -241,19 +241,6 @@ static int lp5521_multicolor_brightness(struct lp55xx_led *led)
 	return ret;
 }
 
-static int lp5521_led_brightness(struct lp55xx_led *led)
-{
-	struct lp55xx_chip *chip = led->chip;
-	int ret;
-
-	mutex_lock(&chip->lock);
-	ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
-		led->brightness);
-	mutex_unlock(&chip->lock);
-
-	return ret;
-}
-
 static ssize_t show_engine_mode(struct device *dev,
 				struct device_attribute *attr,
 				char *buf, int nr)
@@ -388,9 +375,12 @@ static struct lp55xx_device_config lp5521_cfg = {
 	.prog_mem_base = {
 		.addr = LP5521_REG_R_PROG_MEM,
 	},
+	.reg_led_pwm_base = {
+		.addr = LP5521_REG_LED_PWM_BASE,
+	},
 	.max_channel  = LP5521_MAX_LEDS,
 	.post_init_device   = lp5521_post_init_device,
-	.brightness_fn      = lp5521_led_brightness,
+	.brightness_fn      = lp55xx_led_brightness,
 	.multicolor_brightness_fn = lp5521_multicolor_brightness,
 	.set_led_current    = lp5521_set_led_current,
 	.firmware_cb        = lp55xx_firmware_loaded_cb,

drivers/leds/leds-lp5523.c

@@ -683,18 +683,6 @@ static int lp5523_multicolor_brightness(struct lp55xx_led *led)
 	return ret;
 }
 
-static int lp5523_led_brightness(struct lp55xx_led *led)
-{
-	struct lp55xx_chip *chip = led->chip;
-	int ret;
-
-	mutex_lock(&chip->lock);
-	ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
-		     led->brightness);
-	mutex_unlock(&chip->lock);
-	return ret;
-}
-
 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
@@ -759,10 +747,13 @@ static struct lp55xx_device_config lp5523_cfg = {
 	.prog_mem_base = {
 		.addr = LP5523_REG_PROG_MEM,
 	},
+	.reg_led_pwm_base = {
+		.addr = LP5523_REG_LED_PWM_BASE,
+	},
 	.pages_per_engine   = LP5523_PAGES_PER_ENGINE,
 	.max_channel  = LP5523_MAX_LEDS,
 	.post_init_device   = lp5523_post_init_device,
-	.brightness_fn      = lp5523_led_brightness,
+	.brightness_fn      = lp55xx_led_brightness,
 	.multicolor_brightness_fn = lp5523_multicolor_brightness,
 	.set_led_current    = lp5523_set_led_current,
 	.firmware_cb        = lp55xx_firmware_loaded_cb,

drivers/leds/leds-lp55xx-common.c

@@ -242,6 +242,20 @@ void lp55xx_firmware_loaded_cb(struct lp55xx_chip *chip)
 }
 EXPORT_SYMBOL_GPL(lp55xx_firmware_loaded_cb);
 
+int lp55xx_led_brightness(struct lp55xx_led *led)
+{
+	struct lp55xx_chip *chip = led->chip;
+	const struct lp55xx_device_config *cfg = chip->cfg;
+	int ret;
+
+	mutex_lock(&chip->lock);
+	ret = lp55xx_write(chip, cfg->reg_led_pwm_base.addr + led->chan_nr,
+			   led->brightness);
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lp55xx_led_brightness);
+
 static void lp55xx_reset_device(struct lp55xx_chip *chip)
 {
 	const struct lp55xx_device_config *cfg = chip->cfg;

drivers/leds/leds-lp55xx-common.h

@@ -100,6 +100,7 @@ struct lp55xx_reg {
  * @reset              : Chip specific reset command
  * @enable             : Chip specific enable command
  * @prog_mem_base      : Chip specific base reg address for chip SMEM programming
+ * @reg_led_pwm_base   : Chip specific base reg address for LED PWM conf
  * @pages_per_engine   : Assigned pages for each engine
  *                       (if not set chip doesn't support pages)
  * @max_channel        : Maximum number of channels
@@ -118,6 +119,7 @@ struct lp55xx_device_config {
 	const struct lp55xx_reg reset;
 	const struct lp55xx_reg enable;
 	const struct lp55xx_reg prog_mem_base;
+	const struct lp55xx_reg reg_led_pwm_base;
 	const int pages_per_engine;
 	const int max_channel;
 
@@ -213,6 +215,7 @@ extern int lp55xx_run_engine_common(struct lp55xx_chip *chip);
 extern int lp55xx_update_program_memory(struct lp55xx_chip *chip,
 					const u8 *data, size_t size);
 extern void lp55xx_firmware_loaded_cb(struct lp55xx_chip *chip);
+extern int lp55xx_led_brightness(struct lp55xx_led *led);
 
 /* common probe/remove function */
 extern int lp55xx_probe(struct i2c_client *client);

drivers/leds/leds-lp8501.c

@@ -137,19 +137,6 @@ static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
 	lp55xx_run_engine_common(chip);
 }
 
-static int lp8501_led_brightness(struct lp55xx_led *led)
-{
-	struct lp55xx_chip *chip = led->chip;
-	int ret;
-
-	mutex_lock(&chip->lock);
-	ret = lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
-		     led->brightness);
-	mutex_unlock(&chip->lock);
-
-	return ret;
-}
-
 /* Chip specific configurations */
 static struct lp55xx_device_config lp8501_cfg = {
 	.reg_op_mode = {
@@ -173,10 +160,13 @@ static struct lp55xx_device_config lp8501_cfg = {
 	.prog_mem_base = {
 		.addr = LP8501_REG_PROG_MEM,
 	},
+	.reg_led_pwm_base = {
+		.addr = LP8501_REG_LED_PWM_BASE,
+	},
 	.pages_per_engine   = LP8501_PAGES_PER_ENGINE,
 	.max_channel  = LP8501_MAX_LEDS,
 	.post_init_device   = lp8501_post_init_device,
-	.brightness_fn      = lp8501_led_brightness,
+	.brightness_fn      = lp55xx_led_brightness,
 	.set_led_current    = lp8501_set_led_current,
 	.firmware_cb        = lp55xx_firmware_loaded_cb,
 	.run_engine         = lp8501_run_engine,