This adds support for Awinic AW2026 3-channel LED driver with
I2C insterface. It supports hardware blinking and hardware
pattern generator.
Signed-off-by: Vladimir Barinov <v.barinov@xxxxxxxxx>
---
Changes in version 2:
- fixed typos in patch header 2016 -> 2026
drivers/leds/Kconfig | 10 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-aw2026.c | 578 +++++++++++++++++++++++++++++++++++++
3 files changed, 589 insertions(+)
create mode 100644 drivers/leds/leds-aw2026.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index aaa9140bc351..574f3cc47d3e 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -104,6 +104,16 @@ config LEDS_AW2013
To compile this driver as a module, choose M here: the module
will be called leds-aw2013.
+config LEDS_AW2026
+ tristate "LED support for Awinic AW2026"
+ depends on LEDS_CLASS && I2C && OF
+ help
+ This option enables support for the AW2026 3-channel
+ LED driver.
+
+ To compile this driver as a module, choose M here: the module
+ will be called leds-aw2026.
+
config LEDS_BCM6328
tristate "LED Support for Broadcom BCM6328"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index d30395d11fd8..7fb7b48329ff 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o
obj-$(CONFIG_LEDS_APU) += leds-apu.o
obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o
obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o
+obj-$(CONFIG_LEDS_AW2026) += leds-aw2026.o
obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o
obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o
obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
diff --git a/drivers/leds/leds-aw2026.c b/drivers/leds/leds-aw2026.c
new file mode 100644
index 000000000000..7c2d5f62797c
--- /dev/null
+++ b/drivers/leds/leds-aw2026.c
@@ -0,0 +1,578 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Awinic AW2026 3-channel LED driver
+ *
+ * Author: Vladimir Barinov <v.barinov@xxxxxxxxx>
+ * Copyright (C) 2023 KNS Group LLC (YADRO)
+ */
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#define AW2026_MAX_LEDS 3
+
+/* Chip ID and Software Reset Register */
+#define AW2026_RSTIDR 0x00
+#define AW2026_RSTIDR_RESET 0x55
+#define AW2026_RSTIDR_CHIP_ID 0x31
+
+/* Global Control Register */
+#define AW2026_GCR 0x01
+#define AW2026_GCR_CHIPEN BIT(0)
+
+/* LED Maximum Current Register */
+#define AW2026_IMAX 0x03
+#define AW2026_IMAX_MASK (BIT(0) | BIT(1))
+
+/* LED Configure Register */
+#define AW2026_LCFG(x) (0x04 + (x))
+#define AW2026_LCFG_LEDMD BIT(0)
+#define AW2026_LCFG_FADE_IN BIT(1)
+#define AW2026_LCFG_FADE_OUT BIT(2)
+
+/* LED Channel Enable Register */
+#define AW2026_LEDEN 0x07
+
+/* Pattern Run/Stop Register */
+#define AW2026_PATRUN 0x09
+
+/* LED Current Register */
+#define AW2026_ILED(x) (0x10 + (x))
+#define AW2026_ILED_MAX 0xFF
+
+/* PWM duty level Register */
+#define AW2026_PWM(x) (0x1C + (x))
+#define AW2026_PWM_DUTY_MAX 0xFF
+
+/* T1 Time Parameter of Pattern */
+#define AW2026_PAT_T1(x) (0x30 + 5*(x))
+
+/* T2 Time Parameter of Pattern */
+#define AW2026_PAT_T2(x) (0x31 + 5*(x))
+
+struct aw2026;
+
+enum aw2026_state {
+ AW2026_STATE_OFF,
+ AW2026_STATE_ON,
+ AW2026_STATE_KEEP,
+};
+
+struct aw2026_led {
+ struct aw2026 *chip;
+ struct fwnode_handle *fwnode;
+ struct led_classdev cdev;
+ enum aw2026_state default_state;
+ u32 idx;
+};
+
+struct aw2026 {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct mutex lock;
+ struct regulator *vcc_regulator;
+ struct aw2026_led leds[AW2026_MAX_LEDS];
+ int num_leds;
+ unsigned int imax;
+ bool enabled;
+};
+
+static const struct regmap_config aw2026_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x3e,
+};
+
+struct msec_reg {
+ u32 msec;
+ u8 reg;
+};
+
+static const struct msec_reg aw2026_msec_reg[] = {
+ { .msec = 4, .reg = 0x0 },
+ { .msec = 130, .reg = 0x1 },
+ { .msec = 260, .reg = 0x2 },
+ { .msec = 380, .reg = 0x3 },
+ { .msec = 510, .reg = 0x4 },
+ { .msec = 770, .reg = 0x5 },
+ { .msec = 1040, .reg = 0x6 },
+ { .msec = 1600, .reg = 0x7 },
+ { .msec = 2100, .reg = 0x8 },
+ { .msec = 2600, .reg = 0x9 },
+ { .msec = 3100, .reg = 0xa },
+ { .msec = 4200, .reg = 0xb },
+ { .msec = 5200, .reg = 0xc },
+ { .msec = 6200, .reg = 0xd },
+ { .msec = 7300, .reg = 0xe },
+ { .msec = 8300, .reg = 0xf },
+ { /* sentinel */ },
+};
+
+static int aw2026_chip_init(struct aw2026 *chip)
+{
+ int idx, ret;
+
+ ret = regmap_update_bits(chip->regmap, AW2026_GCR, AW2026_GCR_CHIPEN,
+ AW2026_GCR_CHIPEN);
+ if (ret)
+ return ret;
+
+ /* Max current */
+ ret = regmap_update_bits(chip->regmap, AW2026_IMAX,
+ AW2026_IMAX_MASK, chip->imax);
+ if (ret)
+ return ret;
+
+ for (idx = 0; idx < chip->num_leds; idx++) {
+ /* PWM level */
+ ret = regmap_write(chip->regmap, AW2026_PWM(idx), AW2026_PWM_DUTY_MAX);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static void aw2026_chip_disable(struct aw2026 *chip)
+{
+ int ret;
+
+ if (!chip->enabled)
+ return;
+
+ regmap_update_bits(chip->regmap, AW2026_GCR, AW2026_GCR_CHIPEN, 0);
+
+ ret = regulator_disable(chip->vcc_regulator);
+ if (ret) {
+ dev_err(&chip->client->dev,
+ "Failed to disable regulator: %d\n", ret);
+ return;
+ }
+
+ chip->enabled = false;
+}
+
+static int aw2026_chip_enable(struct aw2026 *chip)
+{
+ int ret;
+
+ if (chip->enabled)
+ return 0;
+
+ ret = regulator_enable(chip->vcc_regulator);
+ if (ret) {
+ dev_err(&chip->client->dev,
+ "Failed to enable regulator: %d\n", ret);
+ return ret;
+ }
+ chip->enabled = true;
+
+ ret = aw2026_chip_init(chip);
+ if (ret)
+ aw2026_chip_disable(chip);
+
+ return ret;
+}
+
+static bool aw2026_chip_in_use(struct aw2026 *chip)
+{
+ int i;
+
+ for (i = 0; i < chip->num_leds; i++)
+ if (chip->leds[i].cdev.brightness)
+ return true;
+
+ return false;
+}
+
+static int aw2026_brightness_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct aw2026_led *led = container_of(cdev, struct aw2026_led, cdev);
+ int ret, idx = led->idx;
+
+ mutex_lock(&led->chip->lock);
+
+ if (aw2026_chip_in_use(led->chip)) {
+ ret = aw2026_chip_enable(led->chip);
+ if (ret)
+ goto error;
+ }
+
+ if (brightness) {
+ /* Manual mode */
+ ret = regmap_update_bits(led->chip->regmap, AW2026_LCFG(idx),
+ AW2026_LCFG_LEDMD, 0);
+ if (ret)
+ goto error;
+ /* Current configure */
+ ret = regmap_write(led->chip->regmap, AW2026_ILED(idx), brightness);
+ if (ret)
+ goto error;
+ /* Enable LED */
+ ret = regmap_update_bits(led->chip->regmap, AW2026_LEDEN, BIT(idx), 0xFF);
+ } else {
+ /* Disable LED */
+ ret = regmap_update_bits(led->chip->regmap, AW2026_LEDEN, BIT(idx), 0);
+ }
+ if (ret)
+ goto error;
+
+ if (!aw2026_chip_in_use(led->chip))
+ aw2026_chip_disable(led->chip);
+
+error:
+ mutex_unlock(&led->chip->lock);
+
+ return ret;
+}
+
+static int aw2026_convert_msec_to_reg(struct aw2026 *chip, u32 *msec, u8 *reg)
+{
+ const struct msec_reg *value;
+ const struct msec_reg *prev_value = NULL;
+
+ for (value = aw2026_msec_reg; value->msec; value++) {
+ if (value->msec >= *msec)
+ break;
+ prev_value = value;
+ }
+
+ if (!value->msec) {
+ dev_err(&chip->client->dev, "Unsupported msec (%u)", *msec);
+ return -ERANGE;
+ }
+
+ if (prev_value && ((*msec - prev_value->msec) <= (value->msec - *msec)))
+ value = prev_value;
+
+ *reg = value->reg;
+ *msec = value->msec;
+
+ return 0;
+}
+
+static int aw2026_pattern_setup(struct aw2026_led *led, u8 trise, u8 ton, u8 tfall, u8 toff)
+{
+ int ret, idx = led->idx;
+
+ mutex_lock(&led->chip->lock);
+
+ if (aw2026_chip_in_use(led->chip)) {
+ ret = aw2026_chip_enable(led->chip);
+ if (ret)
+ goto error;
+ }
+
+ /* Pattern mode */
+ ret = regmap_update_bits(led->chip->regmap, AW2026_LCFG(idx),
+ AW2026_LCFG_LEDMD, 0xFF);
+ if (ret)
+ goto error;
+ /* Current configure */
+ ret = regmap_write(led->chip->regmap, AW2026_ILED(idx), led->cdev.brightness);
+ if (ret)
+ goto error;
+ /* Rise and On time of Pattern */
+ ret = regmap_write(led->chip->regmap, AW2026_PAT_T1(idx), (trise << 4) | ton);
+ if (ret)
+ goto error;
+ /* Fall and Off time of Pattern */
+ ret = regmap_write(led->chip->regmap, AW2026_PAT_T2(idx), (tfall << 4) | toff);
+ if (ret)
+ goto error;
+ /* Pattern run for individual LED */
+ ret = regmap_update_bits(led->chip->regmap, AW2026_PATRUN, BIT(idx), 0xFF);
+ if (ret)
+ goto error;
+ /* Enable LED */
+ ret = regmap_update_bits(led->chip->regmap, AW2026_LEDEN, BIT(idx), 0xFF);
+
+error:
+ mutex_unlock(&led->chip->lock);
+
+ return ret;
+}
+
+static int aw2026_pattern_set(struct led_classdev *cdev,
+ struct led_pattern *pattern,
+ u32 len, int repeat)
+{
+ struct aw2026_led *led = container_of(cdev, struct aw2026_led, cdev);
+ struct aw2026 *chip = led->chip;
+ int ret;
+ u8 trise, ton, tfall, toff;
+
+ if (len == 1) {
+ led->cdev.brightness = pattern[0].brightness;
+ return aw2026_brightness_set(cdev, led->cdev.brightness);
+ }
+
+ if (repeat > 0 || len != 4)
+ return -EINVAL;
+
+ ret = aw2026_convert_msec_to_reg(chip, &pattern[0].delta_t, &trise);
+ if (ret)
+ return ret;
+ ret = aw2026_convert_msec_to_reg(chip, &pattern[1].delta_t, &ton);
+ if (ret)
+ return ret;
+ ret = aw2026_convert_msec_to_reg(chip, &pattern[2].delta_t, &tfall);
+ if (ret)
+ return ret;
+ ret = aw2026_convert_msec_to_reg(chip, &pattern[3].delta_t, &toff);
+ if (ret)
+ return ret;
+
+ dev_dbg(&chip->client->dev, "pattern timings: %d %d %d %d\n",
+ trise, ton, tfall, toff);
+
+ led->cdev.brightness = max(max(pattern[0].brightness, pattern[1].brightness),
+ max(pattern[2].brightness, pattern[3].brightness));
+
+ return aw2026_pattern_setup(led, trise, ton, tfall, toff);
+}
+
+static int aw2026_pattern_clear(struct led_classdev *cdev)
+{
+ return aw2026_brightness_set(cdev, LED_OFF);
+}
+
+static int aw2026_blink_set(struct led_classdev *cdev,
+ unsigned long *delay_on, unsigned long *delay_off)
+{
+ struct aw2026_led *led = container_of(cdev, struct aw2026_led, cdev);
+ struct aw2026 *chip = led->chip;
+ u8 ton, toff;
+ int ret;
+
+ if (!*delay_on) {
+ led->cdev.brightness = LED_OFF;
+ return aw2026_brightness_set(&led->cdev, LED_OFF);
+ }
+
+ led->cdev.brightness = LED_FULL;
+
+ if (!*delay_off)
+ return aw2026_brightness_set(&led->cdev, LED_FULL);
+
+ ret = aw2026_convert_msec_to_reg(chip, (u32 *)delay_on, &ton);
+ if (ret)
+ return ret;
+ ret = aw2026_convert_msec_to_reg(chip, (u32 *)delay_off, &toff);
+ if (ret)
+ return ret;
+
+ dev_dbg(&chip->client->dev, "blink timings: %d %d\n", ton, toff);
+
+ return aw2026_pattern_setup(led, 0, ton, 0, toff);
+}
+
+static int aw2026_parse_dt(struct i2c_client *client, struct aw2026 *chip)
+{
+ struct device_node *np = dev_of_node(&client->dev), *child;
+ int count, ret = 0, i = 0;
+ struct aw2026_led *led;
+ const char *str;
+ u32 imax;
+
+ count = of_get_available_child_count(np);
+ if (!count || count > AW2026_MAX_LEDS)
+ return -EINVAL;
+
+ if (!of_property_read_u32(np, "awinic,led-max-microamp", &imax)) {
+ chip->imax = min_t(u32, hweight32(imax / 3187 - 1), 3);
+ } else {
+ chip->imax = 1; /* 6.375mA */
+ dev_info(&client->dev,
+ "DT property led-max-microamp is missing\n");
+ }
+
+ for_each_available_child_of_node(np, child) {
+ u32 source;
+
+ ret = of_property_read_u32(child, "reg", &source);
+ if (ret != 0 || source >= AW2026_MAX_LEDS) {
+ dev_err(&chip->client->dev,
+ "Couldn't read LED address: %d\n", ret);
+ count--;
+ continue;
+ }
+
+ led = &chip->leds[i];
+ led->idx = source;
+ led->chip = chip;
+ led->fwnode = of_fwnode_handle(child);
+
+ if (!of_property_read_string(child, "default-state", &str)) {
+ if (!strcmp(str, "on"))
+ led->default_state = AW2026_STATE_ON;
+ else if (!strcmp(str, "keep"))
+ led->default_state = AW2026_STATE_KEEP;
+ else
+ led->default_state = AW2026_STATE_OFF;
+ }
+
+ i++;
+ }
+
+ if (!count)
+ return -EINVAL;
+
+ chip->num_leds = i;
+
+ return 0;
+}
+
+static void aw2026_init_default_state(struct aw2026_led *led)
+{
+ struct aw2026 *chip = led->chip;
+ int led_on;
+ int ret, idx = led->idx;
+
+ switch (led->default_state) {
+ case AW2026_STATE_ON:
+ led->cdev.brightness = LED_FULL;
+ break;
+ case AW2026_STATE_KEEP:
+ /* keep setup made in loader */
+ ret = regmap_read(chip->regmap, AW2026_LEDEN, &led_on);
+ if (ret)
+ return;
+
+ if (!(led_on & BIT(idx))) {
+ led->cdev.brightness = LED_OFF;
+ break;
+ }
+ regmap_read(chip->regmap, AW2026_ILED(idx),
+ &led->cdev.brightness);
+ return;
+ default:
+ led->cdev.brightness = LED_OFF;
+ }
+
+ aw2026_brightness_set(&led->cdev, led->cdev.brightness);
+}
+
+static int aw2026_probe(struct i2c_client *client)
+{
+ struct aw2026 *chip;
+ int i, ret;
+ unsigned int chipid;
+
+ chip = devm_kzalloc(&client->dev, sizeof(struct aw2026), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ ret = aw2026_parse_dt(client, chip);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&chip->lock);
+ chip->client = client;
+ i2c_set_clientdata(client, chip);
+
+ chip->regmap = devm_regmap_init_i2c(client, &aw2026_regmap_config);
+ if (IS_ERR(chip->regmap)) {
+ ret = PTR_ERR(chip->regmap);
+ dev_err(&client->dev, "Failed to allocate register map: %d\n",
+ ret);
+ goto error;
+ }
+
+ chip->vcc_regulator = devm_regulator_get(&client->dev, "vcc");
+ ret = PTR_ERR_OR_ZERO(chip->vcc_regulator);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "Failed to request regulator: %d\n", ret);
+ goto error;
+ }
+
+ ret = regulator_enable(chip->vcc_regulator);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to enable regulator: %d\n", ret);
+ goto error;
+ }
+
+ ret = regmap_read(chip->regmap, AW2026_RSTIDR, &chipid);
+ if (ret) {
+ dev_err(&client->dev, "Failed to read chip ID: %d\n", ret);
+ goto error_reg;
+ }
+
+ if (chipid != AW2026_RSTIDR_CHIP_ID) {
+ ret = -ENODEV;
+ goto error_reg;
+ }
+
+ for (i = 0; i < chip->num_leds; i++) {
+ struct led_init_data init_data = {};
+ struct aw2026_led *led = &chip->leds[i];
+
+ aw2026_init_default_state(&chip->leds[i]);
+ led->cdev.brightness_set_blocking = aw2026_brightness_set;
+ led->cdev.blink_set = aw2026_blink_set;
+ led->cdev.pattern_set = aw2026_pattern_set;
+ led->cdev.pattern_clear = aw2026_pattern_clear;
+
+ init_data.fwnode = chip->leds[i].fwnode;
+
+ ret = devm_led_classdev_register_ext(&client->dev,
+ &led->cdev, &init_data);
+ if (ret < 0)
+ goto error_reg;
+ }
+
+ ret = regulator_disable(chip->vcc_regulator);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to disable regulator: %d\n", ret);
+ goto error;
+ }
+
+ return 0;
+
+error_reg:
+ regulator_disable(chip->vcc_regulator);
+error:
+ mutex_destroy(&chip->lock);
+ return ret;
+}
+
+static void aw2026_remove(struct i2c_client *client)
+{
+ struct aw2026 *chip = i2c_get_clientdata(client);
+
+ aw2026_chip_disable(chip);
+
+ mutex_destroy(&chip->lock);
+}
+
+static const struct of_device_id aw2026_match_table[] = {
+ { .compatible = "awinic,aw2026", },
+ { /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, aw2026_match_table);
+
+static struct i2c_driver aw2026_driver = {
+ .driver = {
+ .name = "leds-aw2026",
+ .of_match_table = of_match_ptr(aw2026_match_table),
+ },
+ .probe_new = aw2026_probe,
+ .remove = aw2026_remove,
+};
+
+module_i2c_driver(aw2026_driver);
+
+MODULE_DESCRIPTION("AW2026 LED driver");
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_LICENSE("GPL");
--
2.34.1
