Message-ID: <20181219162626.12297-3-dmurphy@ti.com>
Date:   Wed, 19 Dec 2018 10:26:26 -0600
From:   Dan Murphy <dmurphy@...com>
To:     <robh+dt@...nel.org>, <jacek.anaszewski@...il.com>, <pavel@....cz>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-leds@...r.kernel.org>, Dan Murphy <dmurphy@...com>
Subject: [PATCH 2/2] leds: lp5024: Add the LP5024/18 RGB LED driver

Introduce the LP5024 and LP5018 RGB LED driver.
The difference in these 2 parts are only in the number of
LED outputs where the LP5024 can control 24 LEDs the LP5018
can only control 18.

The device has the ability to group LED output into control banks
so that multiple LED banks can be controlled with the same mixing and
brightness.  Inversely the LEDs can also be controlled independently.

Signed-off-by: Dan Murphy <dmurphy@...com>
---
 drivers/leds/Kconfig       |   7 +
 drivers/leds/Makefile      |   1 +
 drivers/leds/leds-lp5024.c | 610 +++++++++++++++++++++++++++++++++++++
 3 files changed, 618 insertions(+)
 create mode 100644 drivers/leds/leds-lp5024.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index a72f97fca57b..d306bedb00b7 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -326,6 +326,13 @@ config LEDS_LP3952
 	  To compile this driver as a module, choose M here: the
 	  module will be called leds-lp3952.
 
+config LEDS_LP5024
+	tristate "LED Support for TI LP5024/18 LED driver chip"
+	depends on LEDS_CLASS && REGMAP_I2C
+	help
+	  If you say yes here you get support for the Texas Instruments
+	  LP5024 and LP5018 LED driver.
+
 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
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 4c1b0054f379..60b4e4ddd3ee 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_LEDS_GPIO_REGISTER)	+= leds-gpio-register.o
 obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
 obj-$(CONFIG_LEDS_LP3944)		+= leds-lp3944.o
 obj-$(CONFIG_LEDS_LP3952)		+= leds-lp3952.o
+obj-$(CONFIG_LEDS_LP5024)		+= leds-lp5024.o
 obj-$(CONFIG_LEDS_LP55XX_COMMON)	+= leds-lp55xx-common.o
 obj-$(CONFIG_LEDS_LP5521)		+= leds-lp5521.o
 obj-$(CONFIG_LEDS_LP5523)		+= leds-lp5523.o
diff --git a/drivers/leds/leds-lp5024.c b/drivers/leds/leds-lp5024.c
new file mode 100644
index 000000000000..90e8dca15609
--- /dev/null
+++ b/drivers/leds/leds-lp5024.c
@@ -0,0 +1,610 @@
+// SPDX-License-Identifier: GPL-2.0
+/* TI LP50XX LED chip family driver
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <uapi/linux/uleds.h>
+
+#define LP5024_DEV_CFG0		0x00
+#define LP5024_DEV_CFG1		0x01
+#define LP5024_LED_CFG0		0x02
+#define LP5024_BNK_BRT		0x03
+#define LP5024_BNKA_CLR		0x04
+#define LP5024_BNKB_CLR		0x05
+#define LP5024_BNKC_CLR		0x06
+#define LP5024_LED0_BRT		0x07
+#define LP5024_LED1_BRT		0x08
+#define LP5024_LED2_BRT		0x09
+#define LP5024_LED3_BRT		0x0a
+#define LP5024_LED4_BRT		0x0b
+#define LP5024_LED5_BRT		0x0c
+#define LP5024_LED6_BRT		0x0d
+#define LP5024_LED7_BRT		0x0e
+
+#define LP5024_OUT0_CLR		0x0f
+#define LP5024_OUT1_CLR		0x10
+#define LP5024_OUT2_CLR		0x11
+#define LP5024_OUT3_CLR		0x12
+#define LP5024_OUT4_CLR		0x13
+#define LP5024_OUT5_CLR		0x14
+#define LP5024_OUT6_CLR		0x15
+#define LP5024_OUT7_CLR		0x16
+#define LP5024_OUT8_CLR		0x17
+#define LP5024_OUT9_CLR		0x18
+#define LP5024_OUT10_CLR	0x19
+#define LP5024_OUT11_CLR	0x1a
+#define LP5024_OUT12_CLR	0x1b
+#define LP5024_OUT13_CLR	0x1c
+#define LP5024_OUT14_CLR	0x1d
+#define LP5024_OUT15_CLR	0x1e
+#define LP5024_OUT16_CLR	0x1f
+#define LP5024_OUT17_CLR	0x20
+#define LP5024_OUT18_CLR	0x21
+#define LP5024_OUT19_CLR	0x22
+#define LP5024_OUT20_CLR	0x23
+#define LP5024_OUT21_CLR	0x24
+#define LP5024_OUT22_CLR	0x25
+#define LP5024_OUT23_CLR	0x26
+
+#define LP5024_RESET		0x27
+#define LP5024_SW_RESET		0xff
+
+#define LP5024_CHIP_EN		BIT(6)
+
+#define LP5024_CONTROL_A		0
+#define LP5024_CONTROL_B		1
+#define LP5024_CONTROL_C		2
+#define LP5024_MAX_CONTROL_BANKS	3
+
+#define LP5018_MAX_LED_STRINGS	6
+#define LP5024_MAX_LED_STRINGS	8
+
+enum lp5024_model {
+	LP5018,
+	LP5024,
+};
+
+struct lp5024_led {
+	u32 led_strings[LP5024_MAX_LED_STRINGS];
+	char label[LED_MAX_NAME_SIZE];
+	struct led_classdev led_dev;
+	struct lp5024 *priv;
+	int led_number;
+	u8 ctrl_bank_enabled;
+};
+
+/**
+ * struct lp5024 -
+ * @enable_gpio: Hardware enable gpio
+ * @regulator: LED supply regulator pointer
+ * @client: Pointer to the I2C client
+ * @regmap: Devices register map
+ * @dev: Pointer to the devices device struct
+ * @lock: Lock for reading/writing the device
+ * @model_id: ID of the device
+ * @leds: Array of LED strings
+ */
+struct lp5024 {
+	struct gpio_desc *enable_gpio;
+	struct regulator *regulator;
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct device *dev;
+	struct mutex lock;
+	int model_id;
+	int max_leds;
+	int num_of_leds;
+
+	/* This needs to be at the end of the struct */
+	struct lp5024_led leds[];
+};
+
+static const struct reg_default lp5024_reg_defs[] = {
+	{LP5024_DEV_CFG0, 0x0},
+	{LP5024_DEV_CFG1, 0x3c},
+	{LP5024_BNK_BRT, 0xff},
+	{LP5024_BNKA_CLR, 0x0f},
+	{LP5024_BNKB_CLR, 0x0f},
+	{LP5024_BNKC_CLR, 0x0f},
+	{LP5024_LED0_BRT, 0x0f},
+	{LP5024_LED1_BRT, 0xff},
+	{LP5024_LED2_BRT, 0xff},
+	{LP5024_LED3_BRT, 0xff},
+	{LP5024_LED4_BRT, 0xff},
+	{LP5024_LED5_BRT, 0xff},
+	{LP5024_LED6_BRT, 0xff},
+	{LP5024_LED7_BRT, 0xff},
+	{LP5024_OUT0_CLR, 0x0f},
+	{LP5024_OUT1_CLR, 0x00},
+	{LP5024_OUT2_CLR, 0x00},
+	{LP5024_OUT3_CLR, 0x00},
+	{LP5024_OUT4_CLR, 0x00},
+	{LP5024_OUT5_CLR, 0x00},
+	{LP5024_OUT6_CLR, 0x00},
+	{LP5024_OUT7_CLR, 0x00},
+	{LP5024_OUT8_CLR, 0x00},
+	{LP5024_OUT9_CLR, 0x00},
+	{LP5024_OUT10_CLR, 0x00},
+	{LP5024_OUT11_CLR, 0x00},
+	{LP5024_OUT12_CLR, 0x00},
+	{LP5024_OUT13_CLR, 0x00},
+	{LP5024_OUT14_CLR, 0x00},
+	{LP5024_OUT15_CLR, 0x00},
+	{LP5024_OUT16_CLR, 0x00},
+	{LP5024_OUT17_CLR, 0x00},
+	{LP5024_OUT18_CLR, 0x00},
+	{LP5024_OUT19_CLR, 0x00},
+	{LP5024_OUT20_CLR, 0x00},
+	{LP5024_OUT21_CLR, 0x00},
+	{LP5024_OUT22_CLR, 0x00},
+	{LP5024_OUT23_CLR, 0x00},
+	{LP5024_RESET, 0x00}
+};
+
+static const struct regmap_config lp5024_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = LP5024_RESET,
+	.reg_defaults = lp5024_reg_defs,
+	.num_reg_defaults = ARRAY_SIZE(lp5024_reg_defs),
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static int lp5024_set_color_mix(struct lp5024_led *led, u8 color_reg,
+				u8 color_val)
+{
+	return regmap_write(led->priv->regmap, color_reg, color_val);
+}
+
+
+static ssize_t ctrl_bank_a_mix_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	u8 mix_value;
+	int ret;
+
+	ret = kstrtou8(buf, 0, &mix_value);
+	if (ret)
+		return ret;
+
+	lp5024_set_color_mix(led, LP5024_BNKA_CLR, mix_value);
+
+	return size;
+}
+static ssize_t ctrl_bank_b_mix_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	u8 mix_value;
+	int ret;
+
+	ret = kstrtou8(buf, 0, &mix_value);
+	if (ret)
+		return ret;
+
+	lp5024_set_color_mix(led, LP5024_BNKB_CLR, mix_value);
+
+	return size;
+}
+static ssize_t ctrl_bank_c_mix_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	u8 mix_value;
+	int ret;
+
+	ret = kstrtou8(buf, 0, &mix_value);
+	if (ret)
+		return ret;
+
+	lp5024_set_color_mix(led, LP5024_BNKC_CLR, mix_value);
+
+	return size;
+}
+
+static DEVICE_ATTR_WO(ctrl_bank_a_mix);
+static DEVICE_ATTR_WO(ctrl_bank_b_mix);
+static DEVICE_ATTR_WO(ctrl_bank_c_mix);
+
+static struct attribute *lp5024_ctrl_bank_attrs[] = {
+	&dev_attr_ctrl_bank_a_mix.attr,
+	&dev_attr_ctrl_bank_b_mix.attr,
+	&dev_attr_ctrl_bank_c_mix.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(lp5024_ctrl_bank);
+
+static ssize_t led3_mix_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	u8 mix_value;
+	u8 reg_value;
+	int ret;
+
+	ret = kstrtou8(buf, 0, &mix_value);
+	if (ret)
+		return ret;
+
+	reg_value = (led->led_number * 3) + LP5024_OUT2_CLR;
+
+	lp5024_set_color_mix(led, reg_value, mix_value);
+
+	return size;
+}
+
+static ssize_t led2_mix_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	u8 mix_value;
+	u8 reg_value;
+	int ret;
+
+	ret = kstrtou8(buf, 0, &mix_value);
+	if (ret)
+		return ret;
+
+	reg_value = (led->led_number * 3) + LP5024_OUT1_CLR;
+
+	lp5024_set_color_mix(led, reg_value, mix_value);
+
+	return size;
+}
+
+static ssize_t led1_mix_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	u8 mix_value;
+	u8 reg_value;
+	int ret;
+
+	ret = kstrtou8(buf, 0, &mix_value);
+	if (ret)
+		return ret;
+
+	reg_value = (led->led_number * 3) + LP5024_OUT0_CLR;
+
+	lp5024_set_color_mix(led, reg_value, mix_value);
+
+	return size;
+}
+
+static DEVICE_ATTR_WO(led1_mix);
+static DEVICE_ATTR_WO(led2_mix);
+static DEVICE_ATTR_WO(led3_mix);
+
+static struct attribute *lp5024_led_independent_attrs[] = {
+	&dev_attr_led1_mix.attr,
+	&dev_attr_led2_mix.attr,
+	&dev_attr_led3_mix.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(lp5024_led_independent);
+
+static int lp5024_brightness_set(struct led_classdev *led_cdev,
+				enum led_brightness brt_val)
+{
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	int ret = 0;
+	u8 reg_val;
+
+	mutex_lock(&led->priv->lock);
+
+	if (led->ctrl_bank_enabled)
+		reg_val = LP5024_BNK_BRT;
+	else
+		reg_val = led->led_number + LP5024_LED0_BRT;
+
+	ret = regmap_write(led->priv->regmap, reg_val, brt_val);
+
+	mutex_unlock(&led->priv->lock);
+
+	return ret;
+}
+
+static enum led_brightness lp5024_brightness_get(struct led_classdev *led_cdev)
+{
+	struct lp5024_led *led = container_of(led_cdev, struct lp5024_led,
+					      led_dev);
+	unsigned int brt_val;
+	u8 reg_val;
+	int ret;
+
+	mutex_lock(&led->priv->lock);
+
+	if (led->ctrl_bank_enabled)
+		reg_val = LP5024_BNK_BRT;
+	else
+		reg_val = led->led_number + LP5024_LED0_BRT;
+
+	ret = regmap_read(led->priv->regmap, reg_val, &brt_val);
+
+	mutex_unlock(&led->priv->lock);
+
+	return brt_val;
+}
+
+static int lp5024_set_led_values(struct lp5024 *priv)
+{
+	struct lp5024_led *led;
+	int i, j;
+	u8 led_ctrl_enable = 0;
+
+	for (i = 0; i <= priv->num_of_leds; i++) {
+		led = &priv->leds[i];
+		if (led->ctrl_bank_enabled) {
+			for (j = 0; j <= LP5024_MAX_LED_STRINGS - 1; j++)
+				led_ctrl_enable |= (1 << led->led_strings[j]);
+		}
+	}
+
+	regmap_write(priv->regmap, LP5024_LED_CFG0, led_ctrl_enable);
+
+	return 0;
+}
+
+static int lp5024_init(struct lp5024 *priv)
+{
+	int ret;
+
+	if (priv->enable_gpio) {
+		gpiod_direction_output(priv->enable_gpio, 1);
+	} else {
+		ret = regmap_write(priv->regmap, LP5024_RESET, LP5024_SW_RESET);
+		if (ret) {
+			dev_err(&priv->client->dev,
+				"Cannot reset the device\n");
+			goto out;
+		}
+	}
+
+	ret = lp5024_set_led_values(priv);
+	if (ret)
+		dev_err(&priv->client->dev, "Setting the CRTL bank failed\n");
+
+	ret = regmap_write(priv->regmap, LP5024_DEV_CFG0, LP5024_CHIP_EN);
+	if (ret) {
+		dev_err(&priv->client->dev, "Cannot write ctrl enable\n");
+		goto out;
+	}
+out:
+	return ret;
+}
+
+static int lp5024_probe_dt(struct lp5024 *priv)
+{
+	struct fwnode_handle *child = NULL;
+	struct lp5024_led *led;
+	const char *name;
+	int led_number;
+	size_t i = 0;
+	int ret;
+
+	priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
+						   "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->enable_gpio)) {
+		ret = PTR_ERR(priv->enable_gpio);
+		dev_err(&priv->client->dev, "Failed to get enable gpio: %d\n",
+			ret);
+		return ret;
+	}
+
+	priv->regulator = devm_regulator_get(&priv->client->dev, "vled");
+	if (IS_ERR(priv->regulator))
+		priv->regulator = NULL;
+
+	if (priv->model_id == LP5018)
+		priv->max_leds = LP5018_MAX_LED_STRINGS;
+	else
+		priv->max_leds = LP5024_MAX_LED_STRINGS;
+
+	device_for_each_child_node(&priv->client->dev, child) {
+		led = &priv->leds[i];
+
+		if (fwnode_property_present(child, "ti,control-bank"))
+			led->ctrl_bank_enabled = 1;
+		else
+			led->ctrl_bank_enabled = 0;
+
+		if (led->ctrl_bank_enabled) {
+			ret = fwnode_property_read_u32_array(child,
+							     "led-sources",
+							     NULL, 0);
+			ret = fwnode_property_read_u32_array(child,
+							     "led-sources",
+							     led->led_strings,
+							     ret);
+
+			led->led_number = led->led_strings[0];
+
+		} else {
+			ret = fwnode_property_read_u32(child, "led-sources",
+					       &led_number);
+
+			led->led_number = led_number;
+		}
+		if (ret) {
+			dev_err(&priv->client->dev,
+				"led-sources property missing\n");
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		if (led_number > priv->max_leds) {
+			dev_err(&priv->client->dev,
+				"led-sources property is invalid\n");
+			ret = -EINVAL;
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		ret = fwnode_property_read_string(child, "label", &name);
+		if (ret)
+			snprintf(led->label, sizeof(led->label),
+				"%s::", priv->client->name);
+		else
+			snprintf(led->label, sizeof(led->label),
+				 "%s:%s", priv->client->name, name);
+
+		fwnode_property_read_string(child, "linux,default-trigger",
+				    &led->led_dev.default_trigger);
+
+		led->priv = priv;
+		led->led_dev.name = led->label;
+		led->led_dev.max_brightness = 255;
+		led->led_dev.brightness_set_blocking = lp5024_brightness_set;
+		led->led_dev.brightness_get = lp5024_brightness_get;
+
+		if (led->ctrl_bank_enabled)
+			led->led_dev.groups = lp5024_ctrl_bank_groups;
+		else
+			led->led_dev.groups = lp5024_led_independent_groups;
+
+		ret = devm_led_classdev_register(&priv->client->dev,
+						 &led->led_dev);
+		if (ret) {
+			dev_err(&priv->client->dev, "led register err: %d\n",
+				ret);
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+		i++;
+	}
+	priv->num_of_leds = i;
+
+child_out:
+	return ret;
+}
+
+static int lp5024_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct lp5024 *led;
+	int count;
+	int ret;
+
+	count = device_get_child_node_count(&client->dev);
+	if (!count) {
+		dev_err(&client->dev, "LEDs are not defined in device tree!");
+		return -ENODEV;
+	}
+
+	led = devm_kzalloc(&client->dev, struct_size(led, leds, count),
+			   GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	mutex_init(&led->lock);
+	led->client = client;
+	led->dev = &client->dev;
+	led->model_id = id->driver_data;
+	i2c_set_clientdata(client, led);
+
+	led->regmap = devm_regmap_init_i2c(client, &lp5024_regmap_config);
+	if (IS_ERR(led->regmap)) {
+		ret = PTR_ERR(led->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = lp5024_probe_dt(led);
+	if (ret)
+		return ret;
+
+	ret = lp5024_init(led);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int lp5024_remove(struct i2c_client *client)
+{
+	struct lp5024 *led = i2c_get_clientdata(client);
+	int ret;
+
+	ret = regmap_update_bits(led->regmap, LP5024_DEV_CFG0,
+				 LP5024_CHIP_EN, 0);
+	if (ret) {
+		dev_err(&led->client->dev, "Failed to disable regulator\n");
+		return ret;
+	}
+
+	if (led->enable_gpio)
+		gpiod_direction_output(led->enable_gpio, 0);
+
+	if (led->regulator) {
+		ret = regulator_disable(led->regulator);
+		if (ret)
+			dev_err(&led->client->dev,
+				"Failed to disable regulator\n");
+	}
+
+	mutex_destroy(&led->lock);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp5024_id[] = {
+	{ "lp5018", LP5018 },
+	{ "lp5024", LP5024 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp5024_id);
+
+static const struct of_device_id of_lp5024_leds_match[] = {
+	{ .compatible = "ti,lp5018", },
+	{ .compatible = "ti,lp5024", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_lp5024_leds_match);
+
+static struct i2c_driver lp5024_driver = {
+	.driver = {
+		.name	= "lp5024",
+		.of_match_table = of_lp5024_leds_match,
+	},
+	.probe		= lp5024_probe,
+	.remove		= lp5024_remove,
+	.id_table	= lp5024_id,
+};
+module_i2c_driver(lp5024_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP5024 LED driver");
+MODULE_AUTHOR("Dan Murphy <dmurphy@...com>");
+MODULE_LICENSE("GPL v2");
-- 
2.20.0.rc2.7.g965798d1f2

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