leds-lp55xx: use lp55xx common led registration function

 LED class devices are registered in lp5521_register_leds() and
 lp5523_register_leds().
 Two separate functions are merged into consolidated lp55xx function,
 lp55xx_register_leds().

 Error handling fix:
 Unregistering LEDS are handled in lp55xx_register_leds() when LED registration
 failure occurs. So each driver error handler is changed to 'err_register_leds'

 Chip dependency: 'brightness_work_fn' and 'set_led_current'
 To make the structure abstract, both functions are configured in each driver.
 Those functions should be done by each driver because register control is
 chip-dependant work.

 lp55xx_init_led: skeleton
 Will be filled in next patch

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/leds-lp5521.c

@@ -738,44 +738,6 @@ static int lp5521_init_led(struct lp5521_led *led,
 	return 0;
 }
 
-static int lp5521_register_leds(struct lp5521_chip *chip)
-{
-	struct lp5521_platform_data *pdata = chip->pdata;
-	struct i2c_client *client = chip->client;
-	int i;
-	int led;
-	int ret;
-
-	/* Initialize leds */
-	chip->num_channels = pdata->num_channels;
-	chip->num_leds = 0;
-	led = 0;
-	for (i = 0; i < pdata->num_channels; i++) {
-		/* Do not initialize channels that are not connected */
-		if (pdata->led_config[i].led_current == 0)
-			continue;
-
-		ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
-		if (ret) {
-			dev_err(&client->dev, "error initializing leds\n");
-			return ret;
-		}
-		chip->num_leds++;
-
-		chip->leds[led].id = led;
-		/* Set initial LED current */
-		lp5521_set_led_current(chip, led,
-				chip->leds[led].led_current);
-
-		INIT_WORK(&(chip->leds[led].brightness_work),
-			lp5521_led_brightness_work);
-
-		led++;
-	}
-
-	return 0;
-}
-
 static void lp5521_unregister_leds(struct lp5521_chip *chip)
 {
 	int i;
@@ -836,9 +798,9 @@ static int lp5521_probe(struct i2c_client *client,
 
 	dev_info(&client->dev, "%s programmable led chip found\n", id->name);
 
-	ret = lp5521_register_leds(old_chip);
+	ret = lp55xx_register_leds(led, chip);
 	if (ret)
-		goto fail2;
+		goto err_register_leds;
 
 	ret = lp5521_register_sysfs(client);
 	if (ret) {
@@ -848,6 +810,7 @@ static int lp5521_probe(struct i2c_client *client,
 	return ret;
 fail2:
 	lp5521_unregister_leds(old_chip);
+err_register_leds:
 	lp55xx_deinit_device(chip);
 err_init:
 	return ret;

drivers/leds/leds-lp5523.c

@@ -822,46 +822,6 @@ static int lp5523_init_led(struct lp5523_led *led, struct device *dev,
 	return 0;
 }
 
-static int lp5523_register_leds(struct lp5523_chip *chip, const char *name)
-{
-	struct lp5523_platform_data *pdata = chip->pdata;
-	struct i2c_client *client = chip->client;
-	int i;
-	int led;
-	int ret;
-
-	/* Initialize leds */
-	chip->num_channels = pdata->num_channels;
-	chip->num_leds = 0;
-	led = 0;
-	for (i = 0; i < pdata->num_channels; i++) {
-		/* Do not initialize channels that are not connected */
-		if (pdata->led_config[i].led_current == 0)
-			continue;
-
-		INIT_WORK(&chip->leds[led].brightness_work,
-			lp5523_led_brightness_work);
-
-		ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
-				name);
-		if (ret) {
-			dev_err(&client->dev, "error initializing leds\n");
-			return ret;
-		}
-		chip->num_leds++;
-
-		chip->leds[led].id = led;
-		/* Set LED current */
-		lp5523_write(client,
-			  LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
-			  chip->leds[led].led_current);
-
-		led++;
-	}
-
-	return 0;
-}
-
 static void lp5523_unregister_leds(struct lp5523_chip *chip)
 {
 	int i;
@@ -922,9 +882,9 @@ static int lp5523_probe(struct i2c_client *client,
 
 	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
 
-	ret = lp5523_register_leds(old_chip, id->name);
+	ret = lp55xx_register_leds(led, chip);
 	if (ret)
-		goto fail2;
+		goto err_register_leds;
 
 	ret = lp5523_register_sysfs(client);
 	if (ret) {
@@ -934,6 +894,7 @@ static int lp5523_probe(struct i2c_client *client,
 	return ret;
 fail2:
 	lp5523_unregister_leds(old_chip);
+err_register_leds:
 	lp55xx_deinit_device(chip);
 err_init:
 	return ret;

drivers/leds/leds-lp55xx-common.c

@@ -63,6 +63,12 @@ static int lp55xx_post_init_device(struct lp55xx_chip *chip)
 	return cfg->post_init_device(chip);
 }
 
+static int lp55xx_init_led(struct lp55xx_led *led,
+			struct lp55xx_chip *chip, int chan)
+{
+	return 0;
+}
+
 int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
 {
 	return i2c_smbus_write_byte_data(chip->cl, reg, val);
@@ -170,6 +176,55 @@ void lp55xx_deinit_device(struct lp55xx_chip *chip)
 }
 EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
 
+int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	int num_channels = pdata->num_channels;
+	struct lp55xx_led *each;
+	u8 led_current;
+	int ret;
+	int i;
+
+	if (!cfg->brightness_work_fn) {
+		dev_err(&chip->cl->dev, "empty brightness configuration\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < num_channels; i++) {
+
+		/* do not initialize channels that are not connected */
+		if (pdata->led_config[i].led_current == 0)
+			continue;
+
+		led_current = pdata->led_config[i].led_current;
+		each = led + i;
+		ret = lp55xx_init_led(each, chip, i);
+		if (ret)
+			goto err_init_led;
+
+		INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
+
+		chip->num_leds++;
+		each->chip = chip;
+
+		/* setting led current at each channel */
+		if (cfg->set_led_current)
+			cfg->set_led_current(each, led_current);
+	}
+
+	return 0;
+
+err_init_led:
+	for (i = 0; i < chip->num_leds; i++) {
+		each = led + i;
+		led_classdev_unregister(&each->cdev);
+		flush_work(&each->brightness_work);
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lp55xx_register_leds);
+
 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 MODULE_DESCRIPTION("LP55xx Common Driver");
 MODULE_LICENSE("GPL");

drivers/leds/leds-lp55xx-common.h

@@ -33,6 +33,8 @@ struct lp55xx_reg {
  * @reset              : Chip specific reset command
  * @enable             : Chip specific enable command
  * @post_init_device   : Chip specific initialization code
+ * @brightness_work_fn : Brightness work function
+ * @set_led_current    : LED current set function
  */
 struct lp55xx_device_config {
 	const struct lp55xx_reg reset;
@@ -40,6 +42,12 @@ struct lp55xx_device_config {
 
 	/* define if the device has specific initialization process */
 	int (*post_init_device) (struct lp55xx_chip *chip);
+
+	/* access brightness register */
+	void (*brightness_work_fn)(struct work_struct *work);
+
+	/* current setting function */
+	void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
 };
 
 /*
@@ -88,4 +96,7 @@ extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg,
 extern int lp55xx_init_device(struct lp55xx_chip *chip);
 extern void lp55xx_deinit_device(struct lp55xx_chip *chip);
 
+/* common LED class device functions */
+extern int lp55xx_register_leds(struct lp55xx_led *led,
+				struct lp55xx_chip *chip);
 #endif /* _LEDS_LP55XX_COMMON_H */