[PATCH v3 2/2] leds: tps6131x: add support for Texas Instruments TPS6131X flash LED driver

Matthias Fend
2025-04-23T07:48:36Z

The TPS61310/TPS61311 is a flash LED driver with I2C interface. Its power
stage is capable of supplying a maximum total current of roughly 1500mA.
The TPS6131x provides three constant-current sinks, capable of sinking up
to 2 × 400mA (LED1 and LED3) and 800mA (LED2) in flash mode. In torch mode
each sink (LED1, LED2, LED3) supports currents up to 175mA.

Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
---
MAINTAINERS | 7 +
drivers/leds/flash/Kconfig | 11 +
drivers/leds/flash/Makefile | 1 +
drivers/leds/flash/leds-tps6131x.c | 798 +++++++++++++++++++++++++++++++++++++
4 files changed, 817 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index fa1e04e87d1d63c1b01b59744d7ade00fe5a1885..67e7c165efd332dfe3bc5ec64a4cc10845d7bbd6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23983,6 +23983,13 @@ F: Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
F: Documentation/hwmon/tps23861.rst
F: drivers/hwmon/tps23861.c

+TEXAS INSTRUMENTS TPS6131X FLASH LED DRIVER
+M: Matthias Fend <matthias.fend@emfend.at>
+L: linux-leds@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/leds/ti,tps6131x.yaml
+F: drivers/leds/flash/leds-tps6131x.c
+
TEXAS INSTRUMENTS' DAC7612 DAC DRIVER
M: Ricardo Ribalda <ribalda@kernel.org>
L: linux-iio@vger.kernel.org
diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
index f39f0bfe6eefcd376405d9d35dc36e323a485002..55ca663ca506ad8be627f58f6d6308368ea2b928 100644
--- a/drivers/leds/flash/Kconfig
+++ b/drivers/leds/flash/Kconfig
@@ -132,4 +132,15 @@ config LEDS_SY7802

This driver can be built as a module, it will be called "leds-sy7802".

+config LEDS_TPS6131X
+ tristate "LED support for TI TPS6131x flash LED driver"
+ depends on I2C && OF
+ depends on GPIOLIB
+ select REGMAP_I2C
+ help
+ This option enables support for Texas Instruments TPS61310/TPS61311
+ flash LED driver.
+
+ This driver can be built as a module, it will be called "leds-tps6131x".
+
endif # LEDS_CLASS_FLASH
diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
index 48860eeced79513a0ed303e4af3db9bfe9724b7e..712fb737a428e42747e1aa339058dc4306ade9c8 100644
--- a/drivers/leds/flash/Makefile
+++ b/drivers/leds/flash/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_LEDS_RT4505) += leds-rt4505.o
obj-$(CONFIG_LEDS_RT8515) += leds-rt8515.o
obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
obj-$(CONFIG_LEDS_SY7802) += leds-sy7802.o
+obj-$(CONFIG_LEDS_TPS6131X) += leds-tps6131x.o
diff --git a/drivers/leds/flash/leds-tps6131x.c b/drivers/leds/flash/leds-tps6131x.c
new file mode 100644
index 0000000000000000000000000000000000000000..c123fb3f908c865f8a9e60b0339067cdb5a864f6
--- /dev/null
+++ b/drivers/leds/flash/leds-tps6131x.c
@@ -0,0 +1,798 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Texas Instruments TPS61310/TPS61311 flash LED driver with I2C interface
+ *
+ * Copyright 2025 Matthias Fend <matthias.fend@emfend.at>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/led-class-flash.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <media/v4l2-flash-led-class.h>
+
+/* Registers */
+
+#define TPS6131X_REG_0 0x00
+#define TPS6131X_REG_0_RESET BIT(7)
+#define TPS6131X_REG_0_DCLC13 GENMASK(5, 3)
+#define TPS6131X_REG_0_DCLC13_SHIFT 3
+#define TPS6131X_REG_0_DCLC2 GENMASK(2, 0)
+#define TPS6131X_REG_0_DCLC2_SHIFT 0
+
+#define TPS6131X_REG_1 0x01
+#define TPS6131X_REG_1_MODE GENMASK(7, 6)
+#define TPS6131X_REG_1_MODE_SHIFT 6
+#define TPS6131X_REG_1_FC2 GENMASK(5, 0)
+#define TPS6131X_REG_1_FC2_SHIFT 0
+
+#define TPS6131X_REG_2 0x02
+#define TPS6131X_REG_2_MODE GENMASK(7, 6)
+#define TPS6131X_REG_2_MODE_SHIFT 6
+#define TPS6131X_REG_2_ENVM BIT(5)
+#define TPS6131X_REG_2_FC13 GENMASK(4, 0)
+#define TPS6131X_REG_2_FC13_SHIFT 0
+
+#define TPS6131X_REG_3 0x03
+#define TPS6131X_REG_3_STIM GENMASK(7, 5)
+#define TPS6131X_REG_3_STIM_SHIFT 5
+#define TPS6131X_REG_3_HPFL BIT(4)
+#define TPS6131X_REG_3_SELSTIM_TO BIT(3)
+#define TPS6131X_REG_3_STT BIT(2)
+#define TPS6131X_REG_3_SFT BIT(1)
+#define TPS6131X_REG_3_TXMASK BIT(0)
+
+#define TPS6131X_REG_4 0x04
+#define TPS6131X_REG_4_PG BIT(7)
+#define TPS6131X_REG_4_HOTDIE_HI BIT(6)
+#define TPS6131X_REG_4_HOTDIE_LO BIT(5)
+#define TPS6131X_REG_4_ILIM BIT(4)
+#define TPS6131X_REG_4_INDC GENMASK(3, 0)
+#define TPS6131X_REG_4_INDC_SHIFT 0
+
+#define TPS6131X_REG_5 0x05
+#define TPS6131X_REG_5_SELFCAL BIT(7)
+#define TPS6131X_REG_5_ENPSM BIT(6)
+#define TPS6131X_REG_5_STSTRB1_DIR BIT(5)
+#define TPS6131X_REG_5_GPIO BIT(4)
+#define TPS6131X_REG_5_GPIOTYPE BIT(3)
+#define TPS6131X_REG_5_ENLED3 BIT(2)
+#define TPS6131X_REG_5_ENLED2 BIT(1)
+#define TPS6131X_REG_5_ENLED1 BIT(0)
+
+#define TPS6131X_REG_6 0x06
+#define TPS6131X_REG_6_ENTS BIT(7)
+#define TPS6131X_REG_6_LEDHOT BIT(6)
+#define TPS6131X_REG_6_LEDWARN BIT(5)
+#define TPS6131X_REG_6_LEDHDR BIT(4)
+#define TPS6131X_REG_6_OV GENMASK(3, 0)
+#define TPS6131X_REG_6_OV_SHIFT 0
+
+#define TPS6131X_REG_7 0x07
+#define TPS6131X_REG_7_ENBATMON BIT(7)
+#define TPS6131X_REG_7_BATDROOP GENMASK(6, 4)
+#define TPS6131X_REG_7_BATDROOP_SHIFT 4
+#define TPS6131X_REG_7_REVID GENMASK(2, 0)
+#define TPS6131X_REG_7_REVID_SHIFT 0
+
+/* Constants */
+
+#define TPS6131X_MAX_CHANNELS 3
+
+#define TPS6131X_FLASH_MAX_I_CHAN13_MA 400
+#define TPS6131X_FLASH_MAX_I_CHAN2_MA 800
+#define TPS6131X_FLASH_STEP_I_MA 25
+
+#define TPS6131X_TORCH_MAX_I_CHAN13_MA 175
+#define TPS6131X_TORCH_MAX_I_CHAN2_MA 175
+#define TPS6131X_TORCH_STEP_I_MA 25
+
+#define TPS6131X_TORCH_REFRESH_INTERVAL_JIFFIES msecs_to_jiffies(10000)
+
+#define UA_TO_MA(UA) ((UA) / 1000)
+
+enum tps6131x_mode {
+ TPS6131X_MODE_SHUTDOWN = 0x0,
+ TPS6131X_MODE_TORCH = 0x1,
+ TPS6131X_MODE_FLASH = 0x2,
+};
+
+struct tps6131x {
+ struct device *dev;
+ struct regmap *regmap;
+ struct gpio_desc *reset_gpio;
+ /*
+ * Registers 0, 1, 2, and 3 control parts of the controller that are not completely
+ * independent of each other. Since some operations require the registers to be written in
+ * a specific order to avoid unwanted side effects, they are synchronized with a lock.
+ */
+ struct mutex lock; /* Hardware access lock for register 0, 1, 2 and 3 */
+ struct delayed_work torch_refresh_work;
+ bool valley_current_limit;
+ bool chan1_en;
+ bool chan2_en;
+ bool chan3_en;
+ struct fwnode_handle *led_node;
+ u32 max_flash_current_ma;
+ u32 step_flash_current_ma;
+ u32 max_torch_current_ma;
+ u32 step_torch_current_ma;
+ u32 max_timeout_us;
+ struct led_classdev_flash fled_cdev;
+ struct v4l2_flash *v4l2_flash;
+};
+
+static struct tps6131x *fled_cdev_to_tps6131x(struct led_classdev_flash *fled_cdev)
+{
+ return container_of(fled_cdev, struct tps6131x, fled_cdev);
+}
+
+/*
+ * Register contents after a power on/reset. These values ​​cannot be changed.
+ */
+static const struct reg_default tps6131x_regmap_defaults[] = {
+ { TPS6131X_REG_0, (1 << TPS6131X_REG_0_DCLC13_SHIFT) | (2 << TPS6131X_REG_0_DCLC2_SHIFT) },
+ { TPS6131X_REG_1, (0 << TPS6131X_REG_1_MODE_SHIFT) | (16 << TPS6131X_REG_1_FC2_SHIFT) },
+ { TPS6131X_REG_2, (0 << TPS6131X_REG_2_MODE_SHIFT) | (8 << TPS6131X_REG_2_FC13_SHIFT) },
+ { TPS6131X_REG_3, (6 << TPS6131X_REG_3_STIM_SHIFT) | TPS6131X_REG_3_TXMASK },
+ { TPS6131X_REG_4, (0 << TPS6131X_REG_4_INDC_SHIFT) },
+ { TPS6131X_REG_5, TPS6131X_REG_5_ENPSM | TPS6131X_REG_5_STSTRB1_DIR |
+ TPS6131X_REG_5_GPIOTYPE | TPS6131X_REG_5_ENLED2 },
+ { TPS6131X_REG_6, (9 << TPS6131X_REG_6_OV_SHIFT) },
+ { TPS6131X_REG_7, (4 << TPS6131X_REG_7_BATDROOP_SHIFT) },
+};
+
+/*
+ * These registers contain flags that are reset when read. Ensure that these registers are not read
+ * outside of a call from the driver.
+ */
+static bool tps6131x_regmap_precious(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TPS6131X_REG_3:
+ case TPS6131X_REG_4:
+ case TPS6131X_REG_6:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config tps6131x_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = TPS6131X_REG_7,
+ .reg_defaults = tps6131x_regmap_defaults,
+ .num_reg_defaults = ARRAY_SIZE(tps6131x_regmap_defaults),
+ .cache_type = REGCACHE_FLAT,
+ .precious_reg = &tps6131x_regmap_precious,
+};
+
+struct tps6131x_timer_config {
+ u8 val;
+ u8 range;
+ u32 time_us;
+};
+
+static const struct tps6131x_timer_config tps6131x_timer_configs[] = {
+ { .val = 0, .range = 1, .time_us = 5300 },
+ { .val = 1, .range = 1, .time_us = 10700 },
+ { .val = 2, .range = 1, .time_us = 16000 },
+ { .val = 3, .range = 1, .time_us = 21300 },
+ { .val = 4, .range = 1, .time_us = 26600 },
+ { .val = 5, .range = 1, .time_us = 32000 },
+ { .val = 6, .range = 1, .time_us = 37300 },
+ { .val = 0, .range = 0, .time_us = 68200 },
+ { .val = 7, .range = 1, .time_us = 71500 },
+ { .val = 1, .range = 0, .time_us = 102200 },
+ { .val = 2, .range = 0, .time_us = 136300 },
+ { .val = 3, .range = 0, .time_us = 170400 },
+ { .val = 4, .range = 0, .time_us = 204500 },
+ { .val = 5, .range = 0, .time_us = 340800 },
+ { .val = 6, .range = 0, .time_us = 579300 },
+ { .val = 7, .range = 0, .time_us = 852000 },
+};
+
+static const struct tps6131x_timer_config *tps6131x_find_closest_timer_config(u32 timeout_us)
+{
+ const struct tps6131x_timer_config *timer_config = &tps6131x_timer_configs[0];
+ u32 diff, min_diff = U32_MAX;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(tps6131x_timer_configs); i++) {
+ diff = abs(tps6131x_timer_configs[i].time_us - timeout_us);
+ if (diff < min_diff) {
+ timer_config = &tps6131x_timer_configs[i];
+ min_diff = diff;
+ if (!min_diff)
+ break;
+ }
+ }
+
+ return timer_config;
+}
+
+static int tps6131x_reset_chip(struct tps6131x *tps6131x)
+{
+ int ret;
+
+ if (tps6131x->reset_gpio) {
+ gpiod_set_value_cansleep(tps6131x->reset_gpio, 1);
+ fsleep(10);
+ gpiod_set_value_cansleep(tps6131x->reset_gpio, 0);
+ fsleep(100);
+ } else {
+ ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_0, TPS6131X_REG_0_RESET,
+ TPS6131X_REG_0_RESET);
+ if (ret)
+ return ret;
+
+ fsleep(100);
+
+ ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_0, TPS6131X_REG_0_RESET, 0);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tps6131x_init_chip(struct tps6131x *tps6131x)
+{
+ u32 reg4, reg5, reg6;
+ int ret;
+
+ reg4 = tps6131x->valley_current_limit ? TPS6131X_REG_4_ILIM : 0;
+ ret = regmap_write(tps6131x->regmap, TPS6131X_REG_4, reg4);
+ if (ret)
+ return ret;
+
+ reg5 = TPS6131X_REG_5_ENPSM | TPS6131X_REG_5_STSTRB1_DIR | TPS6131X_REG_5_GPIOTYPE;
+ if (tps6131x->chan1_en)
+ reg5 |= TPS6131X_REG_5_ENLED1;
+
+ if (tps6131x->chan2_en)
+ reg5 |= TPS6131X_REG_5_ENLED2;
+
+ if (tps6131x->chan3_en)
+ reg5 |= TPS6131X_REG_5_ENLED3;
+ ret = regmap_write(tps6131x->regmap, TPS6131X_REG_5, reg5);
+ if (ret)
+ return ret;
+
+ reg6 = TPS6131X_REG_6_ENTS;
+ ret = regmap_write(tps6131x->regmap, TPS6131X_REG_6, reg6);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int tps6131x_set_mode(struct tps6131x *tps6131x, enum tps6131x_mode mode, bool force)
+{
+ u8 val;
+
+ val = mode << TPS6131X_REG_1_MODE_SHIFT;
+
+ return regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_1, TPS6131X_REG_1_MODE, val,
+ NULL, false, force);
+}
+
+static void tps6131x_torch_refresh_handler(struct work_struct *work)
+{
+ struct tps6131x *tps6131x = container_of(work, struct tps6131x, torch_refresh_work.work);
+
+ guard(mutex)(&tps6131x->lock);
+
+ tps6131x_set_mode(tps6131x, TPS6131X_MODE_TORCH, true);
+
+ schedule_delayed_work(&tps6131x->torch_refresh_work,
+ TPS6131X_TORCH_REFRESH_INTERVAL_JIFFIES);
+}
+
+static int tps6131x_brightness_set(struct led_classdev *cdev, enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+ u32 num_chans;
+ u32 steps_chan13, steps_chan2;
+ u32 steps_remaining;
+ u8 reg0;
+ int ret;
+
+ cancel_delayed_work_sync(&tps6131x->torch_refresh_work);
+
+ /*
+ * The brightness parameter uses the number of current steps as the unit (not the current
+ * value itself). Since the reported step size can vary depending on the configuration,
+ * this value must be converted into actual register steps.
+ */
+ steps_remaining = (brightness * tps6131x->step_torch_current_ma) / TPS6131X_TORCH_STEP_I_MA;
+
+ num_chans = tps6131x->chan1_en + tps6131x->chan2_en + tps6131x->chan3_en;
+
+ /*
+ * The currents are distributed as evenly as possible across the activated channels.
+ * Since channels 1 and 3 share the same register setting, they always use the same current
+ * value. Channel 2 supports higher currents and thus takes over the remaining additional
+ * portion that cannot be covered by the other channels.
+ */
+ steps_chan13 = min_t(u32, steps_remaining / num_chans,
+ TPS6131X_TORCH_MAX_I_CHAN13_MA / TPS6131X_TORCH_STEP_I_MA);
+ if (tps6131x->chan1_en)
+ steps_remaining -= steps_chan13;
+ if (tps6131x->chan3_en)
+ steps_remaining -= steps_chan13;
+
+ steps_chan2 = min_t(u32, steps_remaining,
+ TPS6131X_TORCH_MAX_I_CHAN2_MA / TPS6131X_TORCH_STEP_I_MA);
+
+ guard(mutex)(&tps6131x->lock);
+
+ reg0 = (steps_chan13 << TPS6131X_REG_0_DCLC13_SHIFT) |
+ (steps_chan2 << TPS6131X_REG_0_DCLC2_SHIFT);
+ ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_0,
+ TPS6131X_REG_0_DCLC13 | TPS6131X_REG_0_DCLC2, reg0);
+ if (ret < 0)
+ return ret;
+
+ ret = tps6131x_set_mode(tps6131x, brightness ? TPS6131X_MODE_TORCH : TPS6131X_MODE_SHUTDOWN,
+ true);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * In order to use both the flash and the video light functions purely via the I2C
+ * interface, STRB1 must be low. If STRB1 is low, then the video light watchdog timer
+ * is also active, which puts the device into the shutdown state after around 13 seconds.
+ * To prevent this, the mode must be refreshed within the watchdog timeout.
+ */
+ if (brightness)
+ schedule_delayed_work(&tps6131x->torch_refresh_work,
+ TPS6131X_TORCH_REFRESH_INTERVAL_JIFFIES);
+
+ return 0;
+}
+
+static int tps6131x_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
+{
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+ int ret;
+
+ guard(mutex)(&tps6131x->lock);
+
+ ret = tps6131x_set_mode(tps6131x, state ? TPS6131X_MODE_FLASH : TPS6131X_MODE_SHUTDOWN,
+ true);
+ if (ret < 0)
+ return ret;
+
+ if (state) {
+ ret = regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_3, TPS6131X_REG_3_SFT,
+ TPS6131X_REG_3_SFT, NULL, false, true);
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_3, TPS6131X_REG_3_SFT, 0, NULL,
+ false, true);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int tps6131x_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
+{
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+ u32 num_chans;
+ u32 steps_chan13, steps_chan2;
+ u32 steps_remaining;
+ int ret;
+
+ steps_remaining = brightness / TPS6131X_FLASH_STEP_I_MA;
+ num_chans = tps6131x->chan1_en + tps6131x->chan2_en + tps6131x->chan3_en;
+ steps_chan13 = min_t(u32, steps_remaining / num_chans,
+ TPS6131X_FLASH_MAX_I_CHAN13_MA / TPS6131X_FLASH_STEP_I_MA);
+ if (tps6131x->chan1_en)
+ steps_remaining -= steps_chan13;
+ if (tps6131x->chan3_en)
+ steps_remaining -= steps_chan13;
+ steps_chan2 = min_t(u32, steps_remaining,
+ TPS6131X_FLASH_MAX_I_CHAN2_MA / TPS6131X_FLASH_STEP_I_MA);
+
+ guard(mutex)(&tps6131x->lock);
+
+ ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_2, TPS6131X_REG_2_FC13,
+ steps_chan13 << TPS6131X_REG_2_FC13_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_1, TPS6131X_REG_1_FC2,
+ steps_chan2 << TPS6131X_REG_1_FC2_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ fled_cdev->brightness.val = brightness;
+
+ return 0;
+}
+
+static int tps6131x_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout_us)
+{
+ const struct tps6131x_timer_config *timer_config;
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+ u8 reg3;
+ int ret;
+
+ guard(mutex)(&tps6131x->lock);
+
+ timer_config = tps6131x_find_closest_timer_config(timeout_us);
+
+ reg3 = timer_config->val << TPS6131X_REG_3_STIM_SHIFT;
+ if (timer_config->range)
+ reg3 |= TPS6131X_REG_3_SELSTIM_TO;
+
+ ret = regmap_update_bits(tps6131x->regmap, TPS6131X_REG_3,
+ TPS6131X_REG_3_STIM | TPS6131X_REG_3_SELSTIM_TO, reg3);
+ if (ret < 0)
+ return ret;
+
+ fled_cdev->timeout.val = timer_config->time_us;
+
+ return 0;
+}
+
+static int tps6131x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
+{
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+ unsigned int reg3;
+ int ret;
+
+ ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_3, &reg3);
+ if (ret)
+ return ret;
+
+ *state = !!(reg3 & TPS6131X_REG_3_SFT);
+
+ return 0;
+}
+
+static int tps6131x_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
+{
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+ unsigned int reg3, reg4, reg6;
+ int ret;
+
+ *fault = 0;
+
+ ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_3, &reg3);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_4, &reg4);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read_bypassed(tps6131x->regmap, TPS6131X_REG_6, &reg6);
+ if (ret < 0)
+ return ret;
+
+ if (reg3 & TPS6131X_REG_3_HPFL)
+ *fault |= LED_FAULT_SHORT_CIRCUIT;
+
+ if (reg3 & TPS6131X_REG_3_SELSTIM_TO)
+ *fault |= LED_FAULT_TIMEOUT;
+
+ if (reg4 & TPS6131X_REG_4_HOTDIE_HI)
+ *fault |= LED_FAULT_OVER_TEMPERATURE;
+
+ if (reg6 & (TPS6131X_REG_6_LEDHOT | TPS6131X_REG_6_LEDWARN))
+ *fault |= LED_FAULT_LED_OVER_TEMPERATURE;
+
+ if (!(reg6 & TPS6131X_REG_6_LEDHDR))
+ *fault |= LED_FAULT_UNDER_VOLTAGE;
+
+ if (reg6 & TPS6131X_REG_6_LEDHOT) {
+ ret = regmap_update_bits_base(tps6131x->regmap, TPS6131X_REG_6,
+ TPS6131X_REG_6_LEDHOT, 0, NULL, false, true);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct led_flash_ops flash_ops = {
+ .flash_brightness_set = tps6131x_flash_brightness_set,
+ .strobe_set = tps6131x_strobe_set,
+ .strobe_get = tps6131x_strobe_get,
+ .timeout_set = tps6131x_flash_timeout_set,
+ .fault_get = tps6131x_flash_fault_get,
+};
+
+static int tps6131x_parse_node(struct tps6131x *tps6131x)
+{
+ const struct tps6131x_timer_config *timer_config;
+ struct device *dev = tps6131x->dev;
+ u32 channels[TPS6131X_MAX_CHANNELS];
+ u32 current_step_multiplier;
+ u32 current_ua;
+ u32 max_current_flash_ma, max_current_torch_ma;
+ u32 timeout_us;
+ int num_channels;
+ int i;
+ int ret;
+
+ tps6131x->valley_current_limit = device_property_read_bool(dev, "ti,valley-current-limit");
+
+ tps6131x->led_node = fwnode_get_next_available_child_node(dev->fwnode, NULL);
+ if (!tps6131x->led_node) {
+ dev_err(dev, "Missing LED node\n");
+ return -EINVAL;
+ }
+
+ num_channels = fwnode_property_count_u32(tps6131x->led_node, "led-sources");
+ if (num_channels <= 0) {
+ dev_err(dev, "Failed to read led-sources property\n");
+ return -EINVAL;
+ }
+
+ if (num_channels > TPS6131X_MAX_CHANNELS) {
+ dev_err(dev, "led-sources count %u exceeds maximum channel count %u\n",
+ num_channels, TPS6131X_MAX_CHANNELS);
+ return -EINVAL;
+ }
+
+ ret = fwnode_property_read_u32_array(tps6131x->led_node, "led-sources", channels,
+ num_channels);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read led-sources property\n");
+ return ret;
+ }
+
+ max_current_flash_ma = 0;
+ max_current_torch_ma = 0;
+ for (i = 0; i < num_channels; i++) {
+ switch (channels[i]) {
+ case 1:
+ tps6131x->chan1_en = true;
+ max_current_flash_ma += TPS6131X_FLASH_MAX_I_CHAN13_MA;
+ max_current_torch_ma += TPS6131X_TORCH_MAX_I_CHAN13_MA;
+ break;
+ case 2:
+ tps6131x->chan2_en = true;
+ max_current_flash_ma += TPS6131X_FLASH_MAX_I_CHAN2_MA;
+ max_current_torch_ma += TPS6131X_TORCH_MAX_I_CHAN2_MA;
+ break;
+ case 3:
+ tps6131x->chan3_en = true;
+ max_current_flash_ma += TPS6131X_FLASH_MAX_I_CHAN13_MA;
+ max_current_torch_ma += TPS6131X_TORCH_MAX_I_CHAN13_MA;
+ break;
+ default:
+ dev_err(dev, "led-source out of range [1-3]\n");
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * If only channels 1 and 3 are used, the step size is doubled because the two channels
+ * share the same current control register.
+ */
+ current_step_multiplier =
+ (tps6131x->chan1_en && tps6131x->chan3_en && !tps6131x->chan2_en) ? 2 : 1;
+ tps6131x->step_flash_current_ma = current_step_multiplier * TPS6131X_FLASH_STEP_I_MA;
+ tps6131x->step_torch_current_ma = current_step_multiplier * TPS6131X_TORCH_STEP_I_MA;
+
+ ret = fwnode_property_read_u32(tps6131x->led_node, "led-max-microamp", &current_ua);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read led-max-microamp property\n");
+ return ret;
+ }
+
+ tps6131x->max_torch_current_ma = UA_TO_MA(current_ua);
+
+ if (!tps6131x->max_torch_current_ma ||
+ tps6131x->max_torch_current_ma > max_current_torch_ma ||
+ (tps6131x->max_torch_current_ma % tps6131x->step_torch_current_ma)) {
+ dev_err(dev, "led-max-microamp out of range or not a multiple of %u\n",
+ tps6131x->step_torch_current_ma);
+ return -EINVAL;
+ }
+
+ ret = fwnode_property_read_u32(tps6131x->led_node, "flash-max-microamp", &current_ua);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read flash-max-microamp property\n");
+ return ret;
+ }
+
+ tps6131x->max_flash_current_ma = UA_TO_MA(current_ua);
+
+ if (!tps6131x->max_flash_current_ma ||
+ tps6131x->max_flash_current_ma > max_current_flash_ma ||
+ (tps6131x->max_flash_current_ma % tps6131x->step_flash_current_ma)) {
+ dev_err(dev, "flash-max-microamp out of range or not a multiple of %u\n",
+ tps6131x->step_flash_current_ma);
+ return -EINVAL;
+ }
+
+ ret = fwnode_property_read_u32(tps6131x->led_node, "flash-max-timeout-us", &timeout_us);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read flash-max-timeout-us property\n");
+ return ret;
+ }
+
+ timer_config = tps6131x_find_closest_timer_config(timeout_us);
+ tps6131x->max_timeout_us = timer_config->time_us;
+
+ if (tps6131x->max_timeout_us != timeout_us)
+ dev_warn(dev, "flash-max-timeout-us %u not supported (using %u)\n", timeout_us,
+ tps6131x->max_timeout_us);
+
+ return 0;
+}
+
+static int tps6131x_led_class_setup(struct tps6131x *tps6131x)
+{
+ const struct tps6131x_timer_config *timer_config;
+ struct led_classdev *led_cdev;
+ struct led_flash_setting *setting;
+ struct led_init_data init_data = {};
+ int ret;
+
+ tps6131x->fled_cdev.ops = &flash_ops;
+
+ setting = &tps6131x->fled_cdev.timeout;
+ timer_config = tps6131x_find_closest_timer_config(0);
+ setting->min = timer_config->time_us;
+ setting->max = tps6131x->max_timeout_us;
+ setting->step = 1; /* Only some specific time periods are supported. No fixed step size. */
+ setting->val = setting->min;
+
+ setting = &tps6131x->fled_cdev.brightness;
+ setting->min = tps6131x->step_flash_current_ma;
+ setting->max = tps6131x->max_flash_current_ma;
+ setting->step = tps6131x->step_flash_current_ma;
+ setting->val = setting->min;
+
+ led_cdev = &tps6131x->fled_cdev.led_cdev;
+ led_cdev->brightness_set_blocking = tps6131x_brightness_set;
+ led_cdev->max_brightness = tps6131x->max_torch_current_ma;
+ led_cdev->flags |= LED_DEV_CAP_FLASH;
+
+ init_data.fwnode = tps6131x->led_node;
+ init_data.devicename = NULL;
+ init_data.default_label = NULL;
+ init_data.devname_mandatory = false;
+
+ ret = devm_led_classdev_flash_register_ext(tps6131x->dev, &tps6131x->fled_cdev,
+ &init_data);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int tps6131x_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
+{
+ struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+ struct tps6131x *tps6131x = fled_cdev_to_tps6131x(fled_cdev);
+
+ guard(mutex)(&tps6131x->lock);
+
+ return tps6131x_set_mode(tps6131x, enable ? TPS6131X_MODE_FLASH : TPS6131X_MODE_SHUTDOWN,
+ false);
+}
+
+static const struct v4l2_flash_ops tps6131x_v4l2_flash_ops = {
+ .external_strobe_set = tps6131x_flash_external_strobe_set,
+};
+
+static int tps6131x_v4l2_setup(struct tps6131x *tps6131x)
+{
+ struct v4l2_flash_config v4l2_cfg = { 0 };
+ struct led_flash_setting *intensity = &v4l2_cfg.intensity;
+
+ intensity->min = tps6131x->step_torch_current_ma;
+ intensity->max = tps6131x->max_torch_current_ma;
+ intensity->step = tps6131x->step_torch_current_ma;
+ intensity->val = intensity->min;
+
+ strscpy(v4l2_cfg.dev_name, tps6131x->fled_cdev.led_cdev.dev->kobj.name,
+ sizeof(v4l2_cfg.dev_name));
+
+ v4l2_cfg.has_external_strobe = true;
+ v4l2_cfg.flash_faults = LED_FAULT_TIMEOUT | LED_FAULT_OVER_TEMPERATURE |
+ LED_FAULT_SHORT_CIRCUIT | LED_FAULT_UNDER_VOLTAGE |
+ LED_FAULT_LED_OVER_TEMPERATURE;
+
+ tps6131x->v4l2_flash = v4l2_flash_init(tps6131x->dev, tps6131x->led_node,
+ &tps6131x->fled_cdev, &tps6131x_v4l2_flash_ops,
+ &v4l2_cfg);
+ if (IS_ERR(tps6131x->v4l2_flash)) {
+ dev_err(tps6131x->dev, "Failed to initialize v4l2 flash LED\n");
+ return PTR_ERR(tps6131x->v4l2_flash);
+ }
+
+ return 0;
+}
+
+static int tps6131x_probe(struct i2c_client *client)
+{
+ struct tps6131x *tps6131x;
+ int ret;
+
+ tps6131x = devm_kzalloc(&client->dev, sizeof(*tps6131x), GFP_KERNEL);
+ if (!tps6131x)
+ return -ENOMEM;
+
+ tps6131x->dev = &client->dev;
+ i2c_set_clientdata(client, tps6131x);
+ mutex_init(&tps6131x->lock);
+ INIT_DELAYED_WORK(&tps6131x->torch_refresh_work, tps6131x_torch_refresh_handler);
+
+ ret = tps6131x_parse_node(tps6131x);
+ if (ret)
+ return -ENODEV;
+
+ tps6131x->regmap = devm_regmap_init_i2c(client, &tps6131x_regmap);
+ if (IS_ERR(tps6131x->regmap)) {
+ ret = PTR_ERR(tps6131x->regmap);
+ return dev_err_probe(&client->dev, ret, "Failed to allocate register map\n");
+ }
+
+ tps6131x->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(tps6131x->reset_gpio)) {
+ ret = PTR_ERR(tps6131x->reset_gpio);
+ return dev_err_probe(&client->dev, ret, "Failed to get reset GPIO\n");
+ }
+
+ ret = tps6131x_reset_chip(tps6131x);
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "Failed to reset LED controller\n");
+
+ ret = tps6131x_init_chip(tps6131x);
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "Failed to initialize LED controller\n");
+
+ ret = tps6131x_led_class_setup(tps6131x);
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "Failed to setup LED class\n");
+
+ ret = tps6131x_v4l2_setup(tps6131x);
+ if (ret)
+ return dev_err_probe(&client->dev, ret, "Failed to setup v4l2 flash\n");
+
+ return 0;
+}
+
+static void tps6131x_remove(struct i2c_client *client)
+{
+ struct tps6131x *tps6131x = i2c_get_clientdata(client);
+
+ v4l2_flash_release(tps6131x->v4l2_flash);
+
+ cancel_delayed_work_sync(&tps6131x->torch_refresh_work);
+}
+
+static const struct of_device_id of_tps6131x_leds_match[] = {
+ { .compatible = "ti,tps61310" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, of_tps6131x_leds_match);
+
+static struct i2c_driver tps6131x_i2c_driver = {
+ .driver = {
+ .name = "tps6131x",
+ .of_match_table = of_tps6131x_leds_match,
+ },
+ .probe = tps6131x_probe,
+ .remove = tps6131x_remove,
+};
+module_i2c_driver(tps6131x_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments TPS6131X flash LED driver");
+MODULE_AUTHOR("Matthias Fend <matthias.fend@emfend.at>");
+MODULE_LICENSE("GPL");

--
2.34.1