[PATCH V2 2/2] leds: add mp3326 driver

From: Yuxi Wang
Date: Tue Jun 11 2024 - 04:51:57 EST

This commit adds support for MPS MP3326 LED driver.

Signed-off-by: Yuxi Wang <Yuxi.Wang@xxxxxxxxxxxxxxxxxxx>

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index d721b254e1e4..3ca7be35c834 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -266,6 +266,15 @@ config LEDS_MIKROTIK_RB532
This option enables support for the so called "User LED" of
Mikrotik's Routerboard 532.

+config LEDS_MP3326
+ tristate "LED Support for MPS MP3326"
+ depends on LEDS_CLASS
+ depends on LEDS_CLASS_MULTICOLOR
+ help
+ This option enables support for on-chip LED drivers found on
+ MPS MP3326.
+
+
config LEDS_MT6323
tristate "LED Support for Mediatek MT6323 PMIC"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index ce07dc295ff0..c0a8b4b3e7c8 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
+obj-$(CONFIG_LEDS_MP3326) += leds-mp3326.o
obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
diff --git a/drivers/leds/leds-mp3326.c b/drivers/leds/leds-mp3326.c
new file mode 100644
index 000000000000..8abbaf4f6740
--- /dev/null
+++ b/drivers/leds/leds-mp3326.c
@@ -0,0 +1,697 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MP3326 Led driver
+ *
+ * Copyright 2024 Monolithic Power Systems, Inc
+ *
+ * Author: Yuxi Wang <Yuxi.Wang@xxxxxxxxxxxxxxxxxxx>
+ */
+#include <linux/bits.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/leds.h>
+#include <linux/device.h>
+#include <linux/led-class-multicolor.h>
+
+#define MP3326_PWM_DIM_FREQUENCY_CONFIG 0x00
+#define MP3326_PWM_CTRL 0x01
+#define MP3326_PWM_CTRL_CHANNEL_9_16 0x04
+#define MP3326_PWM_CTRL_CHANNEL_1_8 0x05
+#define MP3326_PWM_OPEN_FAULT_CHANNEL_9_16 0x06
+#define MP3326_PWM_OPEN_FAULT_CHANNEL_1_8 0x07
+#define MP3326_PWM_SHORT_FAULT_CHANNEL_9_16 0x08
+#define MP3326_PWM_SHORT_FAULT_CHANNEL_1_8 0x09
+#define MP3326_PWM_CURRENT_SET_CHANNEL1 0x0A
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL1 0x0B
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL1 0x0C
+#define MP3326_PWM_CURRENT_SET_CHANNEL2 0x0D
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL2 0x0E
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL2 0x0F
+#define MP3326_PWM_CURRENT_SET_CHANNEL3 0x10
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL3 0x11
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL3 0x12
+#define MP3326_PWM_CURRENT_SET_CHANNEL4 0x13
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL4 0x14
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL4 0x15
+#define MP3326_PWM_CURRENT_SET_CHANNEL5 0x16
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL5 0x17
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL5 0x18
+#define MP3326_PWM_CURRENT_SET_CHANNEL6 0x19
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL6 0x1A
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL6 0x1B
+#define MP3326_PWM_CURRENT_SET_CHANNEL7 0x1C
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL7 0x1D
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL7 0x1E
+#define MP3326_PWM_CURRENT_SET_CHANNEL8 0x1F
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL8 0x20
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL8 0x21
+#define MP3326_PWM_CURRENT_SET_CHANNEL9 0x22
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL9 0x23
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL9 0x24
+#define MP3326_PWM_CURRENT_SET_CHANNEL10 0x25
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL10 0x26
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL10 0x27
+#define MP3326_PWM_CURRENT_SET_CHANNEL11 0x28
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL11 0x29
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL11 0x2A
+#define MP3326_PWM_CURRENT_SET_CHANNEL12 0x2B
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL12 0x2C
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL12 0x2D
+#define MP3326_PWM_CURRENT_SET_CHANNEL13 0x2E
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL13 0x2F
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL13 0x30
+#define MP3326_PWM_CURRENT_SET_CHANNEL14 0x31
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL14 0x32
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL14 0x33
+#define MP3326_PWM_CURRENT_SET_CHANNEL15 0x34
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL15 0x35
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL15 0x36
+#define MP3326_PWM_CURRENT_SET_CHANNEL16 0x37
+#define MP3326_PWM_DUTY_LSB_SET_CHANNEL16 0x38
+#define MP3326_PWM_DUTY_MSB_SET_CHANNEL16 0x39
+#define MAX_BRIGHTNESS 63
+
+enum led_ctrl {
+ ENABLE = 0,
+ BRIGHTNESS,
+ COLOR_L4,
+ COLOR_H8,
+ OPEN_FAULT,
+ SHORT_FAULT,
+ MAX_CTRL,
+};
+
+enum mp3326_channel {
+ CHANNEL1,
+ CHANNEL2,
+ CHANNEL3,
+ CHANNEL4,
+ CHANNEL5,
+ CHANNEL6,
+ CHANNEL7,
+ CHANNEL8,
+ CHANNEL9,
+ CHANNEL10,
+ CHANNEL11,
+ CHANNEL12,
+ CHANNEL13,
+ CHANNEL14,
+ CHANNEL15,
+ CHANNEL16,
+ MAX_CHANNEL,
+};
+
+#define MP3326_REG_CONNECT_INNER(prefix, range) prefix##range
+#define MP3326_REG_CONNECT(prefix, range) \
+ MP3326_REG_CONNECT_INNER(prefix, range)
+#define MP3326_REG_FIELD(reg, minbit, maxbit) REG_FIELD(reg, minbit, maxbit)
+#define RANGE(a, b) MP3326_REG_CONNECT_INNER(a, b)
+
+#define MP3326_CHANNEL_FIELD(bit, num, range) \
+ { \
+ MP3326_REG_FIELD(MP3326_REG_CONNECT(MP3326_PWM_CTRL_CHANNEL, \
+ range), \
+ bit, bit), \
+ MP3326_REG_FIELD( \
+ MP3326_REG_CONNECT( \
+ MP3326_PWM_CURRENT_SET_CHANNEL, num), \
+ 0, 5), \
+ MP3326_REG_FIELD( \
+ MP3326_REG_CONNECT( \
+ MP3326_PWM_DUTY_LSB_SET_CHANNEL, num), \
+ 0, 3), \
+ MP3326_REG_FIELD( \
+ MP3326_REG_CONNECT( \
+ MP3326_PWM_DUTY_MSB_SET_CHANNEL, num), \
+ 0, 7), \
+ MP3326_REG_FIELD( \
+ MP3326_REG_CONNECT( \
+ MP3326_PWM_OPEN_FAULT_CHANNEL, range), \
+ bit, bit), \
+ MP3326_REG_FIELD( \
+ MP3326_REG_CONNECT( \
+ MP3326_PWM_SHORT_FAULT_CHANNEL, \
+ range), \
+ bit, bit), \
+ }
+
+struct mp3326_led {
+ struct mp3326 *private_data;
+ struct led_classdev cdev;
+ struct mc_subled *subled_info;
+ int num_colors;
+};
+
+struct mp3326 {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct regmap_field *regmap_fields[MAX_CHANNEL][MAX_CTRL];
+ int num_of_leds;
+ struct mp3326_led leds[];
+};
+
+static const struct regmap_config MP3326_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static const struct reg_field channels_reg_fields[MAX_CHANNEL][MAX_CTRL] = {
+ [CHANNEL1] = MP3326_CHANNEL_FIELD(0, 1, RANGE(_1, _8)),
+ [CHANNEL2] = MP3326_CHANNEL_FIELD(1, 2, RANGE(_1, _8)),
+ [CHANNEL3] = MP3326_CHANNEL_FIELD(2, 3, RANGE(_1, _8)),
+ [CHANNEL4] = MP3326_CHANNEL_FIELD(3, 4, RANGE(_1, _8)),
+ [CHANNEL5] = MP3326_CHANNEL_FIELD(4, 5, RANGE(_1, _8)),
+ [CHANNEL6] = MP3326_CHANNEL_FIELD(5, 6, RANGE(_1, _8)),
+ [CHANNEL7] = MP3326_CHANNEL_FIELD(6, 7, RANGE(_1, _8)),
+ [CHANNEL8] = MP3326_CHANNEL_FIELD(7, 8, RANGE(_1, _8)),
+ [CHANNEL9] = MP3326_CHANNEL_FIELD(0, 9, RANGE(_9, _16)),
+ [CHANNEL10] = MP3326_CHANNEL_FIELD(1, 10, RANGE(_9, _16)),
+ [CHANNEL11] = MP3326_CHANNEL_FIELD(2, 11, RANGE(_9, _16)),
+ [CHANNEL12] = MP3326_CHANNEL_FIELD(3, 12, RANGE(_9, _16)),
+ [CHANNEL13] = MP3326_CHANNEL_FIELD(4, 13, RANGE(_9, _16)),
+ [CHANNEL14] = MP3326_CHANNEL_FIELD(5, 14, RANGE(_9, _16)),
+ [CHANNEL15] = MP3326_CHANNEL_FIELD(6, 15, RANGE(_9, _16)),
+ [CHANNEL16] = MP3326_CHANNEL_FIELD(7, 16, RANGE(_9, _16)),
+};
+
+static int led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct mp3326_led *led =
+ container_of(led_cdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ int ret;
+ int i;
+
+ if (brightness > led_cdev->max_brightness)
+ brightness = led_cdev->max_brightness;
+ if (brightness < 0)
+ brightness = 0;
+ for (i = 0; i < led->num_colors; i++) {
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [BRIGHTNESS],
+ brightness);
+ if (ret)
+ return ret;
+ led->subled_info[i].brightness = brightness;
+ }
+ led_cdev->brightness = brightness;
+ return 0;
+}
+/*
+ * PWM in the range of [0 255]
+ */
+static int led_pwm_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct led_classdev *lcdev = dev_get_drvdata(dev);
+ struct mp3326_led *led = container_of(lcdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ ssize_t ret;
+ int r_val, g_val, b_val;
+ int i;
+
+ ret = sscanf(buf, "%i %i %i", &r_val, &g_val, &b_val);
+ if (ret != 3 && ret != 1)
+ return ret;
+
+ r_val = r_val * 4095 / 255 + (r_val * 4095 % 255) / (255 / 2);
+ g_val = g_val * 4095 / 255 + (g_val * 4095 % 255) / (255 / 2);
+ b_val = b_val * 4095 / 255 + (b_val * 4095 % 255) / (255 / 2);
+
+ if (led->num_colors == 1) {
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_L4],
+ r_val & 0x0f);
+ if (ret)
+ return ret;
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_H8],
+ r_val >> 4);
+ if (ret)
+ return ret;
+ } else {
+ for (i = 0; i < led->num_colors; i++) {
+ switch (led->subled_info[i].color_index) {
+ case LED_COLOR_ID_RED:
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i]
+ .channel]
+ [COLOR_L4],
+ r_val & 0x0f);
+ if (ret)
+ return ret;
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i]
+ .channel]
+ [COLOR_H8],
+ r_val >> 4);
+ if (ret)
+ return ret;
+ break;
+ case LED_COLOR_ID_GREEN:
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i]
+ .channel]
+ [COLOR_L4],
+ g_val & 0x0f);
+ if (ret)
+ return ret;
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i]
+ .channel]
+ [COLOR_H8],
+ g_val >> 4);
+ if (ret)
+ return ret;
+ break;
+ case LED_COLOR_ID_BLUE:
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i]
+ .channel]
+ [COLOR_L4],
+ b_val & 0x0f);
+ if (ret)
+ return ret;
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i]
+ .channel]
+ [COLOR_H8],
+ b_val >> 4);
+ if (ret)
+ return ret;
+ break;
+ }
+ }
+ }
+
+ return count;
+}
+
+static int led_pwm_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *lcdev = dev_get_drvdata(dev);
+ struct mp3326_led *led = container_of(lcdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ int ret;
+ int r_val = 0, g_val = 0, b_val = 0, val;
+ int i;
+
+ for (i = 0; i < led->num_colors; i++) {
+ switch (led->subled_info[i].color_index) {
+ case LED_COLOR_ID_RED:
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_L4],
+ &val);
+ if (ret)
+ return ret;
+ r_val |= val;
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_H8],
+ &val);
+ if (ret)
+ return ret;
+ r_val |= val << 4;
+ break;
+ case LED_COLOR_ID_GREEN:
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_L4],
+ &val);
+ if (ret)
+ return ret;
+ g_val |= val;
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_H8],
+ &val);
+ if (ret)
+ return ret;
+ g_val |= val << 4;
+ break;
+ case LED_COLOR_ID_BLUE:
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_L4],
+ &val);
+ if (ret)
+ return ret;
+ b_val |= val;
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_H8],
+ &val);
+ if (ret)
+ return ret;
+ b_val |= val << 4;
+ break;
+ default:
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_L4],
+ &val);
+ if (ret)
+ return ret;
+ r_val |= val;
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [COLOR_H8],
+ &val);
+ if (ret)
+ return ret;
+ r_val |= val << 4;
+ break;
+ }
+ }
+ r_val = r_val * 255 / 4095 + (r_val * 255 % 4095) / (4095 / 2);
+ g_val = g_val * 255 / 4095 + (g_val * 255 % 4095) / (4095 / 2);
+ b_val = b_val * 255 / 4095 + (b_val * 255 % 4095) / (4095 / 2);
+ if (led->num_colors == 1)
+ return sysfs_emit(buf, "0x%x\n", r_val);
+ else
+ return sysfs_emit(buf, "0x%x 0x%x 0x%x\n", r_val, g_val, b_val);
+}
+
+static int led_enable_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct led_classdev *lcdev = dev_get_drvdata(dev);
+ struct mp3326_led *led = container_of(lcdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ int ret;
+ uint val, i;
+
+ ret = kstrtouint(buf, 0, &val);
+ if (ret)
+ return ret;
+ for (i = 0; i < led->num_colors; i++) {
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [BRIGHTNESS],
+ led->subled_info[i].brightness);
+ if (ret)
+ return ret;
+ ret = regmap_field_write(
+ chip->regmap_fields[led->subled_info[i].channel][ENABLE],
+ !!val);
+ if (ret)
+ return ret;
+ }
+
+ return count;
+}
+
+static int led_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *lcdev = dev_get_drvdata(dev);
+ struct mp3326_led *led = container_of(lcdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ uint val, rval = 0;
+ int i, ret;
+
+ for (i = 0; i < led->num_colors; i++) {
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel][ENABLE],
+ &val);
+
+ rval |= val << i;
+ if (ret)
+ return ret;
+ }
+
+ if (rval)
+ return sysfs_emit(buf, "%s\n", "True");
+ else
+ return sysfs_emit(buf, "%s\n", "False");
+}
+
+static int led_short_fault_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *lcdev = dev_get_drvdata(dev);
+ struct mp3326_led *led = container_of(lcdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ uint val, rval = 0, i;
+ int ret;
+
+ for (i = 0; i < led->num_colors; i++) {
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [SHORT_FAULT],
+ &val);
+ rval |= val << i;
+ if (ret)
+ return ret;
+ }
+
+ if (rval)
+ return sysfs_emit(buf, "%s\n", "Occur");
+ else
+ return sysfs_emit(buf, "%s\n", "None");
+}
+
+static int led_open_fault_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *lcdev = dev_get_drvdata(dev);
+ struct mp3326_led *led = container_of(lcdev, struct mp3326_led, cdev);
+ struct mp3326 *chip = led->private_data;
+ uint val, rval = 0, i;
+ int ret;
+
+ for (i = 0; i < led->num_colors; i++) {
+ ret = regmap_field_read(
+ chip->regmap_fields[led->subled_info[i].channel]
+ [OPEN_FAULT],
+ &val);
+ rval |= val << i;
+ if (ret)
+ return ret;
+ }
+
+ if (rval)
+ return sysfs_emit(buf, "%s\n", "Occur");
+ else
+ return sysfs_emit(buf, "%s\n", "None");
+}
+
+static DEVICE_ATTR_RW(led_pwm);
+static DEVICE_ATTR_RW(led_enable);
+static DEVICE_ATTR_RO(led_short_fault);
+static DEVICE_ATTR_RO(led_open_fault);
+
+static struct attribute *led_sysfs_attrs[] = {
+ &dev_attr_led_pwm.attr,
+ &dev_attr_led_enable.attr,
+ &dev_attr_led_short_fault.attr,
+ &dev_attr_led_open_fault.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(led_sysfs);
+
+static int mp3326_add_led(struct mp3326 *chip, struct device_node *np,
+ int index)
+{
+ struct mp3326_led *led = &chip->leds[index];
+ struct mc_subled *info;
+ struct device_node *child;
+ struct led_classdev *cdev;
+ struct led_init_data init_data = {};
+ int ret;
+ int i = 0;
+ int count;
+ u32 color = 0;
+ u32 reg = 0;
+
+ ret = of_property_read_u32(np, "color", &color);
+ if (ret) {
+ dev_err(&chip->client->dev, "Miss color in the node\n");
+ return ret;
+ }
+ led->private_data = chip;
+ if (color == LED_COLOR_ID_RGB) {
+ count = of_get_child_count(np);
+ if (count != 3) {
+ dev_err(&chip->client->dev,
+ "RGB must have three node.\n");
+ return -EINVAL;
+ }
+
+ info = devm_kcalloc(&chip->client->dev, 3, sizeof(*info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ for_each_available_child_of_node(np, child) {
+ ret = of_property_read_u32(child, "reg", &reg);
+ if (ret || reg > MAX_CHANNEL) {
+ dev_err(&chip->client->dev,
+ "reg must less or equal than %d\n",
+ MAX_CHANNEL);
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(child, "color", &color);
+ if (ret) {
+ dev_err(&chip->client->dev,
+ "color must have value\n");
+ return ret;
+ }
+
+ if (color > 3 || !color) {
+ dev_err(&chip->client->dev,
+ "color must be Red, Green and Blue. The color is %d\n",
+ color);
+ return ret;
+ }
+ info[i].color_index = color;
+ info[i].channel = reg;
+ info[i].brightness = 0;
+ i++;
+ }
+
+ led->subled_info = info;
+ led->num_colors = 3;
+ cdev = &led->cdev;
+ cdev->max_brightness = MAX_BRIGHTNESS;
+ cdev->brightness_set_blocking = led_brightness_set;
+ cdev->groups = led_sysfs_groups;
+ init_data.fwnode = &np->fwnode;
+
+ ret = devm_led_classdev_register_ext(&chip->client->dev,
+ &led->cdev, &init_data);
+
+ if (ret) {
+ dev_err(&chip->client->dev,
+ "Unable register multicolor:%s\n", cdev->name);
+ return ret;
+ }
+ } else {
+ ret = of_property_read_u32(np, "reg", &reg);
+ if (ret || reg > MAX_CHANNEL) {
+ dev_err(&chip->client->dev,
+ "reg must less or equal than %d\n",
+ MAX_CHANNEL);
+ return -EINVAL;
+ }
+ info = devm_kcalloc(&chip->client->dev, 1, sizeof(*info),
+ GFP_KERNEL);
+ led->num_colors = 1;
+ info[i].color_index = LED_COLOR_ID_WHITE;
+ info[i].channel = reg;
+ info[i].brightness = 0;
+ led->subled_info = info;
+ cdev = &led->cdev;
+ cdev->max_brightness = MAX_BRIGHTNESS;
+ cdev->brightness_set_blocking = led_brightness_set;
+ cdev->groups = led_sysfs_groups;
+ init_data.fwnode = &np->fwnode;
+ ret = devm_led_classdev_register_ext(&chip->client->dev,
+ &led->cdev, &init_data);
+ if (ret) {
+ dev_err(&chip->client->dev, "Unable register led:%s\n",
+ cdev->name);
+ return ret;
+ }
+ }
+ return ret;
+}
+
+static int mp3326_parse_dt(struct mp3326 *chip)
+{
+ struct device_node *np = dev_of_node(&chip->client->dev);
+ struct device_node *child;
+ int ret;
+ int i = 0;
+
+ for_each_available_child_of_node(np, child) {
+ ret = mp3326_add_led(chip, child, i);
+ if (ret)
+ return ret;
+ i++;
+ }
+
+ ret = regmap_write(chip->regmap, MP3326_PWM_CTRL_CHANNEL_9_16, 0);
+ if (ret)
+ return ret;
+ ret = regmap_write(chip->regmap, MP3326_PWM_CTRL_CHANNEL_1_8, 0);
+ if (ret)
+ return ret;
+ return 0;
+}
+
+static int mp3326_leds_probe(struct i2c_client *client)
+{
+ struct mp3326 *chip;
+ const struct reg_field *reg_fields;
+ int count, i, j;
+
+ count = device_get_child_node_count(&client->dev);
+ if (!count) {
+ return dev_err_probe(&client->dev, -EINVAL,
+ "Incorrect number of leds (%d)", count);
+ }
+ chip = devm_kzalloc(&client->dev, struct_size(chip, leds, count),
+ GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+ chip->num_of_leds = count;
+ i2c_set_clientdata(client, chip);
+ chip->regmap = devm_regmap_init_i2c(client, &MP3326_regmap_config);
+ if (IS_ERR(chip->regmap))
+ return PTR_ERR(chip->regmap);
+
+ for (i = 0; i < MAX_CHANNEL; i++) {
+ reg_fields = channels_reg_fields[i];
+ for (j = 0; j < MAX_CTRL; j++) {
+ chip->regmap_fields[i][j] = devm_regmap_field_alloc(
+ &client->dev, chip->regmap, reg_fields[j]);
+ if (IS_ERR(chip->regmap_fields[i][j]))
+ return PTR_ERR(chip->regmap_fields[i][j]);
+ }
+ }
+ if (mp3326_parse_dt(chip))
+ return 1;
+ else
+ return 0;
+}
+
+static const struct i2c_device_id mp3326_id[] = { { "mp3326", 0 }, {} };
+MODULE_DEVICE_TABLE(i2c, mp3326_id);
+
+static const struct of_device_id mp3326_of_match[] = { { .compatible =
+ "mps,mp3326" },
+ {} };
+MODULE_DEVICE_TABLE(of, mp3326_of_match);
+
+static struct i2c_driver mp3326_driver = {
+ .probe = mp3326_leds_probe,
+ .driver = {
+ .name = "mp3326_led",
+ .of_match_table = mp3326_of_match,
+ },
+ .id_table = mp3326_id,
+};
+
+module_i2c_driver(mp3326_driver);
+MODULE_AUTHOR("Yuxi Wang <Yuxi.Wang@xxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("MPS MP3326 LED driver");
+MODULE_LICENSE("GPL");
--
2.39.2