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Message-ID: <ZnGMAK9bd3pZjWmG@admins-Air>
Date: Tue, 18 Jun 2024 15:30:40 +0200
From: Vicentiu Galanopulo <vicentiu.galanopulo@...ote-tech.co.uk>
To: pavel@....cz, lee@...nel.org, linux-kernel@...r.kernel.org,
linux-leds@...r.kernel.org
Subject: [PATCH v2 2/2] leds: Add LED1202 I2C driver
The LED1202 is a 12-channel low quiescent
current LED driver. The output current can
be adjusted separately for each channel by
8-bit analog (current sink input) and
12-bit digital (PWM) dimming control.
The LED1202 implements 12 low-side current
generators with independent dimming control.
Internal volatile memory allows the user
to store up to 8 different patterns, each
pattern is a particular output configuration
in terms of PWM duty-cycle (on 4096 steps).
Analog dimming (on 256 steps) is
per channel but common to all patterns.
Each active=1 device tree LED node will
have a corresponding entry in /sys/class/leds
with the label name.
The brightness property corresponds to the
per channel analog dimming, while the
patterns[1-8] to the PWM dimming control.
Signed-off-by: Vicentiu Galanopulo <vicentiu.galanopulo@...ote-tech.co.uk>
---
Changes in v2:
- Fix build error for device_attribute modes
drivers/leds/Kconfig | 10 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-led1202.c | 617 ++++++++++++++++++++++++++++++++++++
3 files changed, 628 insertions(+)
create mode 100644 drivers/leds/leds-led1202.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 05e6af88b88c..c65f2b1bbe30 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -899,6 +899,16 @@ config LEDS_LM36274
Say Y to enable the LM36274 LED driver for TI LMU devices.
This supports the LED device LM36274.
+config LEDS_LED1202
+ tristate "LED Support for LED1202 I2C chips"
+ depends on LEDS_CLASS
+ depends on I2C
+ depends on OF
+ help
+ Say Y to enable support for LEDs connected to LED1202
+ LED driver chips accessed via the I2C bus.
+ Supported devices include LED1202.
+
config LEDS_TPS6105X
tristate "LED support for TI TPS6105X"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index effdfc6f1e95..80423fa8818e 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_LEDS_IP30) += leds-ip30.o
obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o
obj-$(CONFIG_LEDS_IS31FL319X) += leds-is31fl319x.o
obj-$(CONFIG_LEDS_IS31FL32XX) += leds-is31fl32xx.o
+obj-$(CONFIG_LEDS_LED1202) += leds-led1202.o
obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
obj-$(CONFIG_LEDS_LM3532) += leds-lm3532.o
obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
diff --git a/drivers/leds/leds-led1202.c b/drivers/leds/leds-led1202.c
new file mode 100644
index 000000000000..4e82f0e66168
--- /dev/null
+++ b/drivers/leds/leds-led1202.c
@@ -0,0 +1,617 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Simple LED driver for ST LED1202 chip
+ *
+ * Copyright (C) 2024 Remote-Tech Ltd. UK
+ */
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+
+#define DRIVER_NAME "led-driver-1202"
+#define DRIVER_VERSION "0.0.1"
+
+#define LL1202_MAX_LEDS 12
+
+#define LL1202_DEVICE_ID 0x00
+#define LL1202_DEV_ENABLE 0x01
+#define LL1202_CHAN_ENABLE_LOW 0x02
+#define LL1202_CHAN_ENABLE_HIGH 0x03
+#define LL1202_CONFIG_REG 0x04
+#define LL1202_ILED_REG0 0x09
+#define LL1202_PATTERN_REP 0x15
+#define LL1202_PATTERN_DUR 0x16
+#define LL1202_PATTERN_PWM 0x1E
+#define LL1202_CLOCK_REG 0xE0
+
+struct ll1202_led {
+ struct led_classdev led_cdev;
+ struct ll1202_chip *chip;
+ int led_num;
+ char name[32];
+ int is_active;
+};
+
+struct ll1202_chip {
+ struct i2c_client *client;
+ struct mutex lock;
+ struct ll1202_led leds[LL1202_MAX_LEDS];
+};
+
+static struct ll1202_led *cdev_to_ll1202_led(struct led_classdev *cdev)
+{
+ return container_of(cdev, struct ll1202_led, led_cdev);
+}
+
+static int ll1202_read_reg(struct ll1202_chip *chip, int reg, uint8_t *val)
+{
+ int ret = i2c_smbus_read_byte_data(chip->client, reg);
+
+ if (ret < 0)
+ return ret;
+
+ *val = (uint8_t)ret;
+ return 0;
+}
+
+static int ll1202_write_reg(struct ll1202_chip *chip, int reg, uint8_t val)
+{
+ return i2c_smbus_write_byte_data(chip->client, reg, val);
+}
+
+static int ll1202_get_channel(struct device *dev)
+{
+ struct device_node *np = dev->parent->of_node, *child;
+ int err, ret = -1;
+
+ for_each_child_of_node(np, child) {
+ if (strncmp(dev->kobj.name,
+ of_get_property(child, "label", NULL),
+ strnlen(dev->kobj.name, MAX_INPUT)) == 0) {
+ err = of_property_read_u32(child, "reg", &ret);
+ if (err) {
+ of_node_put(child);
+ pr_err(DRIVER_NAME
+ ": Failed to read property %s", child->name);
+ return ret;
+ }
+ break;
+ }
+ }
+ return ret;
+}
+
+static ssize_t ll1202_show_all_registers(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct ll1202_chip *chip = dev_get_drvdata(dev);
+ uint8_t reg_value = 0;
+ int ret, i;
+ char *bufp = buf;
+
+ mutex_lock(&chip->lock);
+
+ for (i = LL1202_DEVICE_ID; i <= LL1202_CLOCK_REG; i++) {
+ ret = ll1202_read_reg(chip, i, ®_value);
+ if (ret != 0)
+ dev_err(&chip->client->dev,
+ "Reading register [0x%x] failed.\n", i);
+
+ bufp += snprintf(bufp, PAGE_SIZE, "Addr[0x%x] = 0x%x\n", i,
+ reg_value);
+ }
+
+ mutex_unlock(&chip->lock);
+ return strlen(buf);
+}
+
+static ssize_t
+ll1202_show_patt_sequence_repetition(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ll1202_chip *chip = dev_get_drvdata(dev);
+ unsigned int ret;
+ uint8_t reg_value;
+ char *bufp = buf;
+
+ mutex_lock(&chip->lock);
+ ret = ll1202_read_reg(chip, LL1202_PATTERN_REP, ®_value);
+ if (ret != 0)
+ dev_err(&chip->client->dev, "Reading register [0x%x] failed\n", LL1202_PATTERN_REP);
+ mutex_unlock(&chip->lock);
+ bufp += snprintf(bufp, PAGE_SIZE,
+ "Pattern sequence register, repetition value = %d (times)\n",
+ reg_value);
+ return strlen(buf);
+}
+
+static ssize_t
+ll1202_store_patt_sequence_repetition(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ll1202_chip *chip = dev_get_drvdata(dev);
+ unsigned int ret;
+ unsigned long duration;
+
+ if (!count)
+ return -EINVAL;
+
+ ret = kstrtoul(buf, 10, &duration);
+ if (ret) {
+ dev_err(&chip->client->dev, "sscanf failed with error :%d\n",
+ ret);
+ return ret;
+ }
+
+ mutex_lock(&chip->lock);
+ ret = ll1202_write_reg(chip, LL1202_PATTERN_REP, duration);
+ if (ret != 0)
+ dev_err(&chip->client->dev, "Writing register [0x%x] failed\n",
+ LL1202_PATTERN_REP);
+ mutex_unlock(&chip->lock);
+ return count;
+}
+
+static int ll1202_prescalar_to_miliamps(uint8_t reg_value)
+{
+ return reg_value * 20 / 255;
+}
+
+static int ll1202_prescalar_to_miliseconds(uint8_t reg_value)
+{
+ return reg_value * 5660 / 255;
+}
+
+static ssize_t ll1202_show_channel_mA_current(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ll1202_chip *chip = dev_get_drvdata(dev->parent);
+ unsigned int ret;
+ uint8_t reg_value;
+ char *bufp = buf;
+ int led_num = ll1202_get_channel(dev);
+
+ if (led_num < 0 || led_num >= LL1202_MAX_LEDS) {
+ dev_err(&chip->client->dev,
+ "Invalid register [0x%x] (out of range)\n",
+ led_num);
+ }
+ mutex_lock(&chip->lock);
+ ret = ll1202_read_reg(chip, LL1202_ILED_REG0 + led_num, ®_value);
+ if (ret != 0)
+ dev_err(&chip->client->dev, "Reading analog dimming register [0x%x] failed\n",
+ led_num);
+ mutex_unlock(&chip->lock);
+ bufp += snprintf(bufp, PAGE_SIZE, "Channel[%d] = %d mA\n", led_num,
+ ll1202_prescalar_to_miliamps(reg_value));
+ return strlen(buf);
+}
+
+static int ll1202_channel_activate(struct ll1202_led *led)
+{
+ struct ll1202_chip *chip;
+ uint8_t reg_chan_low, reg_chan_high;
+ int ret = 0;
+
+ chip = led->chip;
+ if (led->is_active) {
+ mutex_lock(&chip->lock);
+
+ ret = ll1202_read_reg(chip, LL1202_CHAN_ENABLE_LOW,
+ ®_chan_low);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Failed reading register [0x%x]\n", LL1202_CHAN_ENABLE_LOW);
+ }
+
+ ret = ll1202_read_reg(chip, LL1202_CHAN_ENABLE_HIGH,
+ ®_chan_high);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Failed reading register [0x%x]\n", LL1202_CHAN_ENABLE_HIGH);
+ }
+
+ reg_chan_low = reg_chan_low | BIT(led->led_num);
+ ret = ll1202_write_reg(chip, LL1202_CHAN_ENABLE_LOW,
+ reg_chan_low);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Failed writing to register [0x%x]\n", LL1202_CHAN_ENABLE_LOW);
+ }
+ reg_chan_high = reg_chan_high | (BIT(led->led_num) >> 7);
+ ret = ll1202_write_reg(chip, LL1202_CHAN_ENABLE_HIGH,
+ reg_chan_high);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Failed writing to register [0x%x]\n", LL1202_CHAN_ENABLE_HIGH);
+ }
+ mutex_unlock(&chip->lock);
+ }
+ return ret;
+}
+
+#define LL1202_PWM_PATTERN_ATTR(pattern) \
+ static ssize_t ll1202_show_pwm_pattern##pattern( \
+ struct device *dev, struct device_attribute *attr, char *buf) \
+ { \
+ struct ll1202_chip *chip = dev_get_drvdata(dev->parent); \
+ uint8_t duration = 0; \
+ uint8_t reg_value_l = 0; \
+ uint8_t reg_value_h = 0; \
+ uint16_t reg_value = 0; \
+ int ret; \
+ char *bufp = buf; \
+ int led_num = ll1202_get_channel(dev); \
+ if (led_num < 0 || led_num >= LL1202_MAX_LEDS) { \
+ dev_err(&chip->client->dev, \
+ "Invalid register [0x%x] (out of range)\n", \
+ led_num); \
+ } \
+ mutex_lock(&chip->lock); \
+ ret = ll1202_read_reg( \
+ chip, \
+ (LL1202_PATTERN_PWM + (led_num * 2) + 0x18 * pattern), \
+ ®_value_l); \
+ if (ret != 0) \
+ dev_err(&chip->client->dev, \
+ "Reading pattern PWM register [0x%x] failed\n", led_num); \
+ ret = ll1202_read_reg(chip, \
+ (LL1202_PATTERN_PWM + 0x1 + \
+ (led_num * 2) + 0x18 * pattern), \
+ ®_value_h); \
+ if (ret != 0) \
+ dev_err(&chip->client->dev, \
+ "Reading pattern PWM register [0x%x] failed\n", led_num); \
+ reg_value = (uint16_t)reg_value_h << 8 | reg_value_l; \
+ ret = ll1202_read_reg(chip, (LL1202_PATTERN_DUR + pattern), \
+ &duration); \
+ if (ret != 0) \
+ dev_err(&chip->client->dev, \
+ "Reading pattern durating register [0x%x] failed\n", led_num); \
+ bufp += snprintf( \
+ bufp, PAGE_SIZE, \
+ "Pattern[%d][cs%d]: PWM = 0x%03X; DURATION = %d ms\n", \
+ pattern, led_num, reg_value, \
+ ll1202_prescalar_to_miliseconds(duration)); \
+ mutex_unlock(&chip->lock); \
+ return strlen(buf); \
+ } \
+ static ssize_t ll1202_store_pwm_pattern##pattern( \
+ struct device *dev, struct device_attribute *attr, \
+ const char *buf, size_t count) \
+ { \
+ struct ll1202_chip *chip = dev_get_drvdata(dev->parent); \
+ unsigned int ret, reg_value; \
+ unsigned long duration; \
+ char buf_u8[16]; \
+ uint8_t reg_value_l = 0; \
+ uint8_t reg_value_h = 0; \
+ int led_num = ll1202_get_channel(dev); \
+ if (led_num < 0 || led_num >= LL1202_MAX_LEDS) { \
+ dev_err(&chip->client->dev, \
+ "Invalid register [0x%x] (out of range)\n", \
+ led_num); \
+ return count; \
+ } \
+ if (!count) \
+ return -EINVAL; \
+ ret = sscanf(buf, "%X %s", ®_value, buf_u8); \
+ if (ret == 0) { \
+ dev_err(&chip->client->dev, \
+ "sscanf failed with error :%d\n", ret); \
+ return ret; \
+ } \
+ ret = kstrtoul(buf_u8, 10, &duration); \
+ if (ret) \
+ return ret; \
+ reg_value_l = (uint8_t)reg_value; \
+ reg_value_h = (uint8_t)(reg_value >> 8); \
+ mutex_lock(&chip->lock); \
+ ret = ll1202_write_reg( \
+ chip, \
+ (LL1202_PATTERN_PWM + (led_num * 2) + 0x18 * pattern), \
+ (uint8_t)reg_value_l); \
+ if (ret != 0) \
+ dev_err(&chip->client->dev, \
+ "Writing to register [0x%x] failed, value %d\n", \
+ LL1202_PATTERN_PWM + (led_num * 2) + \
+ 0x18 * pattern, \
+ reg_value_l); \
+ ret = ll1202_write_reg(chip, \
+ (LL1202_PATTERN_PWM + 0x1 + \
+ (led_num * 2) + 0x18 * pattern), \
+ (uint8_t)reg_value_h); \
+ if (ret != 0) \
+ dev_err(&chip->client->dev, \
+ "Writing to register [0x%x] failed, value %d\n", \
+ (LL1202_PATTERN_PWM + 0x1 + (led_num * 2) + \
+ 0x18 * pattern), \
+ reg_value_h); \
+ ret = ll1202_write_reg(chip, (LL1202_PATTERN_DUR + pattern), \
+ (u8)duration); \
+ if (ret != 0) \
+ dev_err(&chip->client->dev, \
+ "Writing to register [0x%x] failed, value %d\n", \
+ (LL1202_PATTERN_DUR + pattern), (u8)duration); \
+ ret = ll1202_write_reg(chip, LL1202_CONFIG_REG, \
+ (0xC0 | pattern)); \
+ if (ret != 0) { \
+ dev_err(&chip->client->dev, \
+ "Failed writing to reg [0x%x]\n", LL1202_CONFIG_REG); \
+ } \
+ mutex_unlock(&chip->lock); \
+ ll1202_channel_activate(&chip->leds[led_num]); \
+ return count; \
+ } \
+ static struct device_attribute dev_attr_led_pwm_pattern##pattern = { \
+ .attr = { \
+ .name = __stringify(pwm_pattern##pattern), \
+ .mode = 00444 | 00200, \
+ }, \
+ .show = ll1202_show_pwm_pattern##pattern, \
+ .store = ll1202_store_pwm_pattern##pattern, \
+}
+
+LL1202_PWM_PATTERN_ATTR(0);
+LL1202_PWM_PATTERN_ATTR(1);
+LL1202_PWM_PATTERN_ATTR(2);
+LL1202_PWM_PATTERN_ATTR(3);
+LL1202_PWM_PATTERN_ATTR(4);
+LL1202_PWM_PATTERN_ATTR(5);
+LL1202_PWM_PATTERN_ATTR(6);
+LL1202_PWM_PATTERN_ATTR(7);
+
+static DEVICE_ATTR(led_device_regsdump, 00444, ll1202_show_all_registers,
+ NULL);
+static DEVICE_ATTR(patt_sequence_repetition, 00444 | 00200,
+ ll1202_show_patt_sequence_repetition,
+ ll1202_store_patt_sequence_repetition);
+static DEVICE_ATTR(current_mA, 00444, ll1202_show_channel_mA_current, NULL);
+
+static struct attribute *led_attrs[] = {
+ &dev_attr_led_device_regsdump.attr,
+ &dev_attr_patt_sequence_repetition.attr,
+ NULL,
+};
+
+static struct attribute *led_group_attrs[] = {
+ &dev_attr_led_pwm_pattern0.attr, &dev_attr_led_pwm_pattern1.attr,
+ &dev_attr_led_pwm_pattern2.attr, &dev_attr_led_pwm_pattern3.attr,
+ &dev_attr_led_pwm_pattern4.attr, &dev_attr_led_pwm_pattern5.attr,
+ &dev_attr_led_pwm_pattern6.attr, &dev_attr_led_pwm_pattern7.attr,
+ &dev_attr_current_mA.attr, NULL,
+};
+
+static struct attribute_group attr_group = {
+ .attrs = led_attrs,
+};
+
+static struct attribute_group attr_pat_group = {
+ .attrs = led_group_attrs,
+};
+
+static const struct attribute_group *ll1202_groups[] = { &attr_pat_group,
+ NULL };
+
+static void ll1202_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct ll1202_led *led = cdev_to_ll1202_led(led_cdev);
+ struct ll1202_chip *chip = led->chip;
+ int ret;
+
+ mutex_lock(&chip->lock);
+ ret = ll1202_write_reg(chip, LL1202_ILED_REG0 + led->led_num, value);
+ if (ret != 0)
+ dev_err(&chip->client->dev, "Reading register [0x%x] failed\n",
+ LL1202_ILED_REG0 + led->led_num);
+ mutex_unlock(&chip->lock);
+}
+
+static enum led_brightness ll1202_brightness_get(struct led_classdev *led_cdev)
+{
+ struct ll1202_led *led = cdev_to_ll1202_led(led_cdev);
+ struct ll1202_chip *chip = led->chip;
+ uint8_t reg_value;
+ int ret;
+
+ mutex_lock(&chip->lock);
+ ret = ll1202_read_reg(chip, LL1202_ILED_REG0 + led->led_num,
+ ®_value);
+ if (ret != 0)
+ dev_err(&chip->client->dev, "Reading register [0x%x] failed\n",
+ LL1202_ILED_REG0 + led->led_num);
+
+ mutex_unlock(&chip->lock);
+ return reg_value;
+}
+
+static int ll1202_dt_init(struct ll1202_chip *chip)
+{
+ struct device_node *np = chip->client->dev.of_node, *child;
+ struct ll1202_led *led;
+ int err, reg;
+
+ for_each_child_of_node(np, child) {
+ err = of_property_read_u32(child, "reg", ®);
+ if (err) {
+ of_node_put(child);
+ pr_err(DRIVER_NAME ": Failed to get child node");
+ return err;
+ }
+ if (reg < 0 || reg >= LL1202_MAX_LEDS) {
+ of_node_put(child);
+ pr_err(DRIVER_NAME ": Invalid register value [0x%x] (out of range)", reg);
+ return -EINVAL;
+ }
+
+ led = &chip->leds[reg];
+ led->led_cdev.name = of_get_property(child, "label", NULL) ?:
+ child->name;
+
+ err = of_property_read_u32(child, "active", &led->is_active);
+ if (err) {
+ of_node_put(child);
+ pr_err(DRIVER_NAME ": Failed to get child node");
+ return err;
+ }
+
+ led->led_cdev.brightness_set = ll1202_brightness_set;
+ led->led_cdev.brightness_get = ll1202_brightness_get;
+ led->led_cdev.groups = ll1202_groups;
+ }
+ return 0;
+}
+
+static int ll1202_setup(struct ll1202_chip *chip)
+{
+ int ret;
+
+ mutex_lock(&chip->lock);
+ ret = ll1202_write_reg(chip, LL1202_DEV_ENABLE, 0x1);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "Failed writing to register [0x%x]\n",
+ LL1202_DEV_ENABLE);
+ }
+ mutex_unlock(&chip->lock);
+ usleep_range(6500, 10000);
+ mutex_lock(&chip->lock);
+ ret = ll1202_write_reg(chip, LL1202_DEV_ENABLE, 0x80);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "Failed writing to register [0x%x]\n",
+ LL1202_DEV_ENABLE);
+ }
+ mutex_unlock(&chip->lock);
+ usleep_range(6500, 10000);
+ mutex_lock(&chip->lock);
+ ret = ll1202_write_reg(chip, LL1202_PATTERN_REP, 0xFF);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "Failed writing to register [0x%x]\n",
+ LL1202_PATTERN_REP);
+ return ret;
+ }
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static int ll1202_probe(struct i2c_client *client)
+{
+ struct ll1202_chip *chip;
+ struct ll1202_led *led;
+ int ret, err;
+ int i;
+
+ pr_info(DRIVER_NAME ": (I2C) " DRIVER_VERSION "\n");
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
+ return -EIO;
+ }
+
+ chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, chip);
+
+ mutex_init(&chip->lock);
+ chip->client = client;
+
+ /* Device tree setup */
+ ret = ll1202_dt_init(chip);
+ if (ret < 0)
+ goto exit;
+
+ /* Configuration setup */
+ ret = ll1202_setup(chip);
+ if (ret < 0)
+ goto exit;
+
+ for (i = 0; i < LL1202_MAX_LEDS; i++) {
+ led = &chip->leds[i];
+ led->chip = chip;
+ led->led_num = i;
+ if (led->is_active) {
+ err = led_classdev_register(&client->dev,
+ &led->led_cdev);
+ if (err < 0) {
+ pr_err(DRIVER_NAME
+ ": Failed to register LED class dev");
+ goto exit;
+ }
+ }
+ }
+
+ ret = sysfs_create_group(&client->dev.kobj, &attr_group);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to create sysfs group for ll1202\n");
+ goto err_setup;
+ }
+
+ return 0;
+
+err_setup:
+ for (i = 0; i < LL1202_MAX_LEDS; i++)
+ led_classdev_unregister(&chip->leds[i].led_cdev);
+exit:
+ mutex_destroy(&chip->lock);
+ devm_kfree(&client->dev, chip);
+ return ret;
+}
+
+static void ll1202_remove(struct i2c_client *client)
+{
+ struct ll1202_chip *dev = i2c_get_clientdata(client);
+ int i;
+
+ for (i = 0; i < LL1202_MAX_LEDS; i++)
+ led_classdev_unregister(&dev->leds[i].led_cdev);
+
+ sysfs_remove_group(&client->dev.kobj, &attr_group);
+
+ mutex_destroy(&dev->lock);
+ devm_kfree(&client->dev, dev->leds);
+ devm_kfree(&client->dev, dev);
+}
+
+static const struct i2c_device_id ll1202_id[] = {
+ { DRIVER_NAME "-i2c", 0 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ll1202_id);
+
+static const struct of_device_id ll1202_dt_ids[] = {
+ {
+ .compatible = "st,led1202",
+ },
+};
+
+MODULE_DEVICE_TABLE(of, ll1202_dt_ids);
+
+static struct i2c_driver ll1202_driver = {
+ .driver = {
+ .name = "ll1202",
+ .of_match_table = of_match_ptr(ll1202_dt_ids),
+ },
+ .probe = ll1202_probe,
+ .remove = ll1202_remove,
+ .id_table = ll1202_id,
+};
+
+module_i2c_driver(ll1202_driver);
+
+MODULE_AUTHOR("Remote Tech LTD");
+MODULE_DESCRIPTION("LED1202 : 12-channel constant current LED driver");
+MODULE_LICENSE("GPL");
--
2.25.1
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