leds: lp55xx: Add multicolor framework support to lp55xx

Add multicolor framework support for the lp55xx family.
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

drivers/leds/Kconfig

@@ -386,7 +386,8 @@ config LEDS_LP3952
 
 config LEDS_LP55XX_COMMON
 	tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
-	depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
+	depends on LEDS_CLASS_MULTICOLOR || !LEDS_CLASS_MULTICOLOR
+	depends on OF
 	select FW_LOADER
 	select FW_LOADER_USER_HELPER
 	help
@@ -396,7 +397,7 @@ config LEDS_LP55XX_COMMON
 config LEDS_LP5521
 	tristate "LED Support for N.S. LP5521 LED driver chip"
 	depends on LEDS_CLASS && I2C
-	select LEDS_LP55XX_COMMON
+	depends on LEDS_LP55XX_COMMON
 	help
 	  If you say yes here you get support for the National Semiconductor
 	  LP5521 LED driver. It is 3 channel chip with programmable engines.
@@ -406,7 +407,7 @@ config LEDS_LP5521
 config LEDS_LP5523
 	tristate "LED Support for TI/National LP5523/55231 LED driver chip"
 	depends on LEDS_CLASS && I2C
-	select LEDS_LP55XX_COMMON
+	depends on LEDS_LP55XX_COMMON
 	help
 	  If you say yes here you get support for TI/National Semiconductor
 	  LP5523/55231 LED driver.
@@ -417,7 +418,7 @@ config LEDS_LP5523
 config LEDS_LP5562
 	tristate "LED Support for TI LP5562 LED driver chip"
 	depends on LEDS_CLASS && I2C
-	select LEDS_LP55XX_COMMON
+	depends on LEDS_LP55XX_COMMON
 	help
 	  If you say yes here you get support for TI LP5562 LED driver.
 	  It is 4 channels chip with programmable engines.
@@ -427,7 +428,7 @@ config LEDS_LP5562
 config LEDS_LP8501
 	tristate "LED Support for TI LP8501 LED driver chip"
 	depends on LEDS_CLASS && I2C
-	select LEDS_LP55XX_COMMON
+	depends on LEDS_LP55XX_COMMON
 	help
 	  If you say yes here you get support for TI LP8501 LED driver.
 	  It is 9 channel chip with programmable engines.

drivers/leds/leds-lp5521.c

@@ -505,9 +505,16 @@ static int lp5521_probe(struct i2c_client *client,
 	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct device_node *np = client->dev.of_node;
 
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->cfg = &lp5521_cfg;
+
 	if (!pdata) {
 		if (np) {
-			pdata = lp55xx_of_populate_pdata(&client->dev, np);
+			pdata = lp55xx_of_populate_pdata(&client->dev, np,
+							 chip);
 			if (IS_ERR(pdata))
 				return PTR_ERR(pdata);
 		} else {
@@ -516,10 +523,6 @@ static int lp5521_probe(struct i2c_client *client,
 		}
 	}
 
-	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
 	led = devm_kcalloc(&client->dev,
 			pdata->num_channels, sizeof(*led), GFP_KERNEL);
 	if (!led)
@@ -527,7 +530,6 @@ static int lp5521_probe(struct i2c_client *client,
 
 	chip->cl = client;
 	chip->pdata = pdata;
-	chip->cfg = &lp5521_cfg;
 
 	mutex_init(&chip->lock);
 

drivers/leds/leds-lp5523.c

@@ -873,9 +873,16 @@ static int lp5523_probe(struct i2c_client *client,
 	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct device_node *np = client->dev.of_node;
 
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->cfg = &lp5523_cfg;
+
 	if (!pdata) {
 		if (np) {
-			pdata = lp55xx_of_populate_pdata(&client->dev, np);
+			pdata = lp55xx_of_populate_pdata(&client->dev, np,
+							 chip);
 			if (IS_ERR(pdata))
 				return PTR_ERR(pdata);
 		} else {
@@ -884,10 +891,6 @@ static int lp5523_probe(struct i2c_client *client,
 		}
 	}
 
-	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
 	led = devm_kcalloc(&client->dev,
 			pdata->num_channels, sizeof(*led), GFP_KERNEL);
 	if (!led)
@@ -895,7 +898,6 @@ static int lp5523_probe(struct i2c_client *client,
 
 	chip->cl = client;
 	chip->pdata = pdata;
-	chip->cfg = &lp5523_cfg;
 
 	mutex_init(&chip->lock);
 

drivers/leds/leds-lp5562.c

@@ -520,9 +520,16 @@ static int lp5562_probe(struct i2c_client *client,
 	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct device_node *np = client->dev.of_node;
 
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->cfg = &lp5562_cfg;
+
 	if (!pdata) {
 		if (np) {
-			pdata = lp55xx_of_populate_pdata(&client->dev, np);
+			pdata = lp55xx_of_populate_pdata(&client->dev, np,
+							 chip);
 			if (IS_ERR(pdata))
 				return PTR_ERR(pdata);
 		} else {
@@ -531,9 +538,6 @@ static int lp5562_probe(struct i2c_client *client,
 		}
 	}
 
-	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
 
 	led = devm_kcalloc(&client->dev,
 			pdata->num_channels, sizeof(*led), GFP_KERNEL);
@@ -542,7 +546,6 @@ static int lp5562_probe(struct i2c_client *client,
 
 	chip->cl = client;
 	chip->pdata = pdata;
-	chip->cfg = &lp5562_cfg;
 
 	mutex_init(&chip->lock);
 

drivers/leds/leds-lp55xx-common.c

@@ -34,6 +34,11 @@ static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
 	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
 }
 
+static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev)
+{
+	return container_of(mc_cdev, struct lp55xx_led, mc_cdev);
+}
+
 static void lp55xx_reset_device(struct lp55xx_chip *chip)
 {
 	struct lp55xx_device_config *cfg = chip->cfg;
@@ -129,6 +134,18 @@ static struct attribute *lp55xx_led_attrs[] = {
 };
 ATTRIBUTE_GROUPS(lp55xx_led);
 
+static int lp55xx_set_mc_brightness(struct led_classdev *cdev,
+				    enum led_brightness brightness)
+{
+	struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev);
+	struct lp55xx_led *led = mcled_cdev_to_led(mc_dev);
+	struct lp55xx_device_config *cfg = led->chip->cfg;
+
+	led_mc_calc_color_components(&led->mc_cdev, brightness);
+	return cfg->multicolor_brightness_fn(led);
+
+}
+
 static int lp55xx_set_brightness(struct led_classdev *cdev,
 			     enum led_brightness brightness)
 {
@@ -145,9 +162,12 @@ static int lp55xx_init_led(struct lp55xx_led *led,
 	struct lp55xx_platform_data *pdata = chip->pdata;
 	struct lp55xx_device_config *cfg = chip->cfg;
 	struct device *dev = &chip->cl->dev;
+	int max_channel = cfg->max_channel;
+	struct mc_subled *mc_led_info;
+	struct led_classdev *led_cdev;
 	char name[32];
+	int i, j = 0;
 	int ret;
-	int max_channel = cfg->max_channel;
 
 	if (chan >= max_channel) {
 		dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
@@ -157,10 +177,43 @@ static int lp55xx_init_led(struct lp55xx_led *led,
 	if (pdata->led_config[chan].led_current == 0)
 		return 0;
 
+	if (pdata->led_config[chan].name) {
+		led->cdev.name = pdata->led_config[chan].name;
+	} else {
+		snprintf(name, sizeof(name), "%s:channel%d",
+			pdata->label ? : chip->cl->name, chan);
+		led->cdev.name = name;
+	}
+
+	if (pdata->led_config[chan].num_colors > 1) {
+		mc_led_info = devm_kcalloc(dev,
+					   pdata->led_config[chan].num_colors,
+					   sizeof(*mc_led_info), GFP_KERNEL);
+		if (!mc_led_info)
+			return -ENOMEM;
+
+		led_cdev = &led->mc_cdev.led_cdev;
+		led_cdev->name = led->cdev.name;
+		led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness;
+		led->mc_cdev.num_colors = pdata->led_config[chan].num_colors;
+		for (i = 0; i < led->mc_cdev.num_colors; i++) {
+			mc_led_info[i].color_index =
+				pdata->led_config[chan].color_id[i];
+			mc_led_info[i].channel =
+					pdata->led_config[chan].output_num[i];
+			j++;
+		}
+
+		led->mc_cdev.subled_info = mc_led_info;
+	} else {
+		led->cdev.brightness_set_blocking = lp55xx_set_brightness;
+	}
+
+	led->cdev.groups = lp55xx_led_groups;
+	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
 	led->led_current = pdata->led_config[chan].led_current;
 	led->max_current = pdata->led_config[chan].max_current;
 	led->chan_nr = pdata->led_config[chan].chan_nr;
-	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
 
 	if (led->chan_nr >= max_channel) {
 		dev_err(dev, "Use channel numbers between 0 and %d\n",
@@ -168,18 +221,11 @@ static int lp55xx_init_led(struct lp55xx_led *led,
 		return -EINVAL;
 	}
 
-	led->cdev.brightness_set_blocking = lp55xx_set_brightness;
-	led->cdev.groups = lp55xx_led_groups;
-
-	if (pdata->led_config[chan].name) {
-		led->cdev.name = pdata->led_config[chan].name;
-	} else {
-		snprintf(name, sizeof(name), "%s:channel%d",
-			pdata->label ? : chip->cl->name, chan);
-		led->cdev.name = name;
-	}
-
+	if (pdata->led_config[chan].num_colors > 1)
+		ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev);
+	else
 		ret = devm_led_classdev_register(dev, &led->cdev);
+
 	if (ret) {
 		dev_err(dev, "led register err: %d\n", ret);
 		return ret;
@@ -515,14 +561,105 @@ void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
 }
 EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
 
+static int lp55xx_parse_common_child(struct device_node *np,
+				     struct lp55xx_led_config *cfg,
+				     int led_number, int *chan_nr)
+{
+	int ret;
+
+	of_property_read_string(np, "chan-name",
+				&cfg[led_number].name);
+	of_property_read_u8(np, "led-cur",
+			    &cfg[led_number].led_current);
+	of_property_read_u8(np, "max-cur",
+			    &cfg[led_number].max_current);
+
+	ret = of_property_read_u32(np, "reg", chan_nr);
+	if (ret)
+		return ret;
+
+	if (*chan_nr < 0 || *chan_nr > cfg->max_channel)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int lp55xx_parse_multi_led_child(struct device_node *child,
+					 struct lp55xx_led_config *cfg,
+					 int child_number, int color_number)
+{
+	int chan_nr, color_id, ret;
+
+	ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(child, "color", &color_id);
+	if (ret)
+		return ret;
+
+	cfg[child_number].color_id[color_number] = color_id;
+	cfg[child_number].output_num[color_number] = chan_nr;
+
+	return 0;
+}
+
+static int lp55xx_parse_multi_led(struct device_node *np,
+				  struct lp55xx_led_config *cfg,
+				  int child_number)
+{
+	struct device_node *child;
+	int num_colors = 0, ret;
+
+	for_each_child_of_node(np, child) {
+		ret = lp55xx_parse_multi_led_child(child, cfg, child_number,
+						   num_colors);
+		if (ret)
+			return ret;
+		num_colors++;
+	}
+
+	cfg[child_number].num_colors = num_colors;
+
+	return 0;
+}
+
+static int lp55xx_parse_logical_led(struct device_node *np,
+				   struct lp55xx_led_config *cfg,
+				   int child_number)
+{
+	int led_color, ret;
+	int chan_nr = 0;
+
+	cfg[child_number].default_trigger =
+		of_get_property(np, "linux,default-trigger", NULL);
+
+	ret = of_property_read_u32(np, "color", &led_color);
+	if (ret)
+		return ret;
+
+	if (led_color == LED_COLOR_ID_MULTI)
+		return lp55xx_parse_multi_led(np, cfg, child_number);
+
+	ret =  lp55xx_parse_common_child(np, cfg, child_number, &chan_nr);
+	if (ret < 0)
+		return ret;
+
+	cfg[child_number].chan_nr = chan_nr;
+
+	return ret;
+}
+
 struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
-						      struct device_node *np)
+						      struct device_node *np,
+						      struct lp55xx_chip *chip)
 {
 	struct device_node *child;
 	struct lp55xx_platform_data *pdata;
 	struct lp55xx_led_config *cfg;
 	int num_channels;
 	int i = 0;
+	int ret;
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -540,16 +677,12 @@ struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
 
 	pdata->led_config = &cfg[0];
 	pdata->num_channels = num_channels;
+	cfg->max_channel = chip->cfg->max_channel;
 
 	for_each_child_of_node(np, child) {
-		cfg[i].chan_nr = i;
-
-		of_property_read_string(child, "chan-name", &cfg[i].name);
-		of_property_read_u8(child, "led-cur", &cfg[i].led_current);
-		of_property_read_u8(child, "max-cur", &cfg[i].max_current);
-		cfg[i].default_trigger =
-			of_get_property(child, "linux,default-trigger", NULL);
-
+		ret = lp55xx_parse_logical_led(child, cfg, i);
+		if (ret)
+			return ERR_PTR(-EINVAL);
 		i++;
 	}
 

drivers/leds/leds-lp55xx-common.h

@@ -12,6 +12,8 @@
 #ifndef _LEDS_LP55XX_COMMON_H
 #define _LEDS_LP55XX_COMMON_H
 
+#include <linux/led-class-multicolor.h>
+
 enum lp55xx_engine_index {
 	LP55XX_ENGINE_INVALID,
 	LP55XX_ENGINE_1,
@@ -93,6 +95,7 @@ struct lp55xx_reg {
  * @max_channel        : Maximum number of channels
  * @post_init_device   : Chip specific initialization code
  * @brightness_fn      : Brightness function
+ * @multicolor_brightness_fn : Multicolor brightness function
  * @set_led_current    : LED current set function
  * @firmware_cb        : Call function when the firmware is loaded
  * @run_engine         : Run internal engine for pattern
@@ -106,9 +109,12 @@ struct lp55xx_device_config {
 	/* define if the device has specific initialization process */
 	int (*post_init_device) (struct lp55xx_chip *chip);
 
-	/* access brightness register */
+	/* set LED brightness */
 	int (*brightness_fn)(struct lp55xx_led *led);
 
+	/* set multicolor LED brightness */
+	int (*multicolor_brightness_fn)(struct lp55xx_led *led);
+
 	/* current setting function */
 	void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
 
@@ -159,6 +165,8 @@ struct lp55xx_chip {
  * struct lp55xx_led
  * @chan_nr         : Channel number
  * @cdev            : LED class device
+ * @mc_cdev         : Multi color class device
+ * @color_components: Multi color LED map information
  * @led_current     : Current setting at each led channel
  * @max_current     : Maximun current at each led channel
  * @brightness      : Brightness value
@@ -167,6 +175,7 @@ struct lp55xx_chip {
 struct lp55xx_led {
 	int chan_nr;
 	struct led_classdev cdev;
+	struct led_classdev_mc mc_cdev;
 	u8 led_current;
 	u8 max_current;
 	u8 brightness;
@@ -196,6 +205,7 @@ extern void lp55xx_unregister_sysfs(struct lp55xx_chip *chip);
 
 /* common device tree population function */
 extern struct lp55xx_platform_data
-*lp55xx_of_populate_pdata(struct device *dev, struct device_node *np);
+*lp55xx_of_populate_pdata(struct device *dev, struct device_node *np,
+			  struct lp55xx_chip *chip);
 
 #endif /* _LEDS_LP55XX_COMMON_H */

drivers/leds/leds-lp8501.c

@@ -308,9 +308,16 @@ static int lp8501_probe(struct i2c_client *client,
 	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct device_node *np = client->dev.of_node;
 
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->cfg = &lp8501_cfg;
+
 	if (!pdata) {
 		if (np) {
-			pdata = lp55xx_of_populate_pdata(&client->dev, np);
+			pdata = lp55xx_of_populate_pdata(&client->dev, np,
+							 chip);
 			if (IS_ERR(pdata))
 				return PTR_ERR(pdata);
 		} else {
@@ -319,10 +326,6 @@ static int lp8501_probe(struct i2c_client *client,
 		}
 	}
 
-	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
 	led = devm_kcalloc(&client->dev,
 			pdata->num_channels, sizeof(*led), GFP_KERNEL);
 	if (!led)
@@ -330,7 +333,6 @@ static int lp8501_probe(struct i2c_client *client,
 
 	chip->cl = client;
 	chip->pdata = pdata;
-	chip->cfg = &lp8501_cfg;
 
 	mutex_init(&chip->lock);
 

include/linux/platform_data/leds-lp55xx.h

@@ -13,18 +13,25 @@
 #define _LEDS_LP55XX_H
 
 #include <linux/gpio/consumer.h>
+#include <linux/led-class-multicolor.h>
 
 /* Clock configuration */
 #define LP55XX_CLOCK_AUTO	0
 #define LP55XX_CLOCK_INT	1
 #define LP55XX_CLOCK_EXT	2
 
+#define LP55XX_MAX_GROUPED_CHAN	4
+
 struct lp55xx_led_config {
 	const char *name;
 	const char *default_trigger;
 	u8 chan_nr;
 	u8 led_current; /* mA x10, 0 if led is not connected */
 	u8 max_current;
+	int num_colors;
+	unsigned int max_channel;
+	int color_id[LED_COLOR_ID_MAX];
+	int output_num[LED_COLOR_ID_MAX];
 };
 
 struct lp55xx_predef_pattern {