[v6,1/2] leds: flash: add driver to support flash LED module in QCOM PMICs

diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
index d3eb689b193c..f36a60409290 100644
--- a/drivers/leds/flash/Kconfig
+++ b/drivers/leds/flash/Kconfig
@@ -61,6 +61,21 @@  config LEDS_MT6360
 	  Independent current sources supply for each flash LED support torch
 	  and strobe mode.
 
+config LEDS_QCOM_FLASH
+	tristate "LED support for flash module inside Qualcomm Technologies, Inc. PMIC"
+	depends on MFD_SPMI_PMIC || COMPILE_TEST
+	depends on LEDS_CLASS && OF
+	depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
+	select REGMAP
+	help
+	  This option enables support for the flash module found in Qualcomm
+	  Technologies, Inc. PMICs. The flash module can have 3 or 4 flash LED
+	  channels and each channel is programmable to support up to 1.5 A full
+	  scale current. It also supports connecting two channels' output together
+	  to supply one LED component to achieve current up to 2 A. In such case,
+	  the total LED current will be split symmetrically on each channel and
+	  they will be enabled/disabled at the same time.
+
 config LEDS_RT4505
 	tristate "LED support for RT4505 flashlight controller"
 	depends on I2C && OF
diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
index 0acbddc0b91b..8a60993f1a25 100644
--- a/drivers/leds/flash/Makefile
+++ b/drivers/leds/flash/Makefile
@@ -6,6 +6,7 @@  obj-$(CONFIG_LEDS_AS3645A)	+= leds-as3645a.o
 obj-$(CONFIG_LEDS_KTD2692)	+= leds-ktd2692.o
 obj-$(CONFIG_LEDS_LM3601X)	+= leds-lm3601x.o
 obj-$(CONFIG_LEDS_MAX77693)	+= leds-max77693.o
+obj-$(CONFIG_LEDS_QCOM_FLASH)	+= leds-qcom-flash.o
 obj-$(CONFIG_LEDS_RT4505)	+= leds-rt4505.o
 obj-$(CONFIG_LEDS_RT8515)	+= leds-rt8515.o
 obj-$(CONFIG_LEDS_SGM3140)	+= leds-sgm3140.o
diff --git a/drivers/leds/flash/leds-qcom-flash.c b/drivers/leds/flash/leds-qcom-flash.c
new file mode 100644
index 000000000000..509c37d00443
--- /dev/null
+++ b/drivers/leds/flash/leds-qcom-flash.c
@@ -0,0 +1,768 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/leds.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <media/v4l2-flash-led-class.h>
+
+/* registers definitions */
+#define FLASH_TYPE_REG			0x04
+#define FLASH_TYPE_VAL			0x18
+
+#define FLASH_SUBTYPE_REG		0x05
+#define FLASH_SUBTYPE_3CH_VAL		0x04
+#define FLASH_SUBTYPE_4CH_VAL		0x07
+
+#define FLASH_STS_3CH_OTST1		BIT(0)
+#define FLASH_STS_3CH_OTST2		BIT(1)
+#define FLASH_STS_3CH_OTST3		BIT(2)
+#define FLASH_STS_3CH_BOB_THM_OVERLOAD	BIT(3)
+#define FLASH_STS_3CH_VPH_DROOP		BIT(4)
+#define FLASH_STS_3CH_BOB_ILIM_S1	BIT(5)
+#define FLASH_STS_3CH_BOB_ILIM_S2	BIT(6)
+#define FLASH_STS_3CH_BCL_IBAT		BIT(7)
+
+#define FLASH_STS_4CH_VPH_LOW		BIT(0)
+#define FLASH_STS_4CH_BCL_IBAT		BIT(1)
+#define FLASH_STS_4CH_BOB_ILIM_S1	BIT(2)
+#define FLASH_STS_4CH_BOB_ILIM_S2	BIT(3)
+#define FLASH_STS_4CH_OTST2		BIT(4)
+#define FLASH_STS_4CH_OTST1		BIT(5)
+#define FLASH_STS_4CHG_BOB_THM_OVERLOAD	BIT(6)
+
+#define FLASH_TIMER_EN_BIT		BIT(7)
+#define FLASH_TIMER_VAL_MASK		GENMASK(6, 0)
+#define FLASH_TIMER_STEP_MS		10
+
+#define FLASH_STROBE_HW_SW_SEL_BIT	BIT(2)
+#define SW_STROBE_VAL			0
+#define HW_STROBE_VAL			1
+#define FLASH_HW_STROBE_TRIGGER_SEL_BIT	BIT(1)
+#define STROBE_LEVEL_TRIGGER_VAL	0
+#define STROBE_EDGE_TRIGGER_VAL		1
+#define FLASH_STROBE_POLARITY_BIT	BIT(0)
+#define STROBE_ACTIVE_HIGH_VAL		1
+
+#define FLASH_IRES_MASK_4CH		BIT(0)
+#define FLASH_IRES_MASK_3CH		GENMASK(1, 0)
+#define FLASH_IRES_12P5MA_VAL		0
+#define FLASH_IRES_5MA_VAL_4CH		1
+#define FLASH_IRES_5MA_VAL_3CH		3
+
+/* constants */
+#define FLASH_CURRENT_MAX_UA		1500000
+#define TORCH_CURRENT_MAX_UA		500000
+#define FLASH_TOTAL_CURRENT_MAX_UA	2000000
+#define FLASH_CURRENT_DEFAULT_UA	1000000
+#define TORCH_CURRENT_DEFAULT_UA	200000
+
+#define TORCH_IRES_UA			5000
+#define FLASH_IRES_UA			12500
+
+#define FLASH_TIMEOUT_MAX_US		1280000
+#define FLASH_TIMEOUT_STEP_US		10000
+
+#define UA_PER_MA			1000
+
+enum hw_type {
+	QCOM_MVFLASH_3CH,
+	QCOM_MVFLASH_4CH,
+};
+
+enum led_mode {
+	FLASH_MODE,
+	TORCH_MODE,
+};
+
+enum led_strobe {
+	SW_STROBE,
+	HW_STROBE,
+};
+
+enum {
+	REG_STATUS1,
+	REG_STATUS2,
+	REG_STATUS3,
+	REG_CHAN_TIMER,
+	REG_ITARGET,
+	REG_MODULE_EN,
+	REG_IRESOLUTION,
+	REG_CHAN_STROBE,
+	REG_CHAN_EN,
+	REG_MAX_COUNT,
+};
+
+struct reg_field mvflash_3ch_regs[REG_MAX_COUNT] = {
+	REG_FIELD(0x08, 0, 7),			/* status1	*/
+	REG_FIELD(0x09, 0, 7),                  /* status2	*/
+	REG_FIELD(0x0a, 0, 7),                  /* status3	*/
+	REG_FIELD_ID(0x40, 0, 7, 3, 1),         /* chan_timer	*/
+	REG_FIELD_ID(0x43, 0, 6, 3, 1),         /* itarget	*/
+	REG_FIELD(0x46, 7, 7),                  /* module_en	*/
+	REG_FIELD(0x47, 0, 5),                  /* iresolution	*/
+	REG_FIELD_ID(0x49, 0, 2, 3, 1),         /* chan_strobe	*/
+	REG_FIELD(0x4c, 0, 2),                  /* chan_en	*/
+};
+
+struct reg_field mvflash_4ch_regs[REG_MAX_COUNT] = {
+	REG_FIELD(0x06, 0, 7),			/* status1	*/
+	REG_FIELD(0x07, 0, 6),			/* status2	*/
+	REG_FIELD(0x09, 0, 7),			/* status3	*/
+	REG_FIELD_ID(0x3e, 0, 7, 4, 1),		/* chan_timer	*/
+	REG_FIELD_ID(0x42, 0, 6, 4, 1),		/* itarget	*/
+	REG_FIELD(0x46, 7, 7),			/* module_en	*/
+	REG_FIELD(0x49, 0, 3),			/* iresolution	*/
+	REG_FIELD_ID(0x4a, 0, 6, 4, 1),		/* chan_strobe	*/
+	REG_FIELD(0x4e, 0, 3),			/* chan_en	*/
+};
+
+struct qcom_flash_led {
+	struct led_classdev_flash	flash;
+	struct v4l2_flash		*v4l2_flash;
+	u32				max_flash_current_ma;
+	u32				max_torch_current_ma;
+	u32				max_timeout_ms;
+	u32				flash_current_ma;
+	u32				flash_timeout_ms;
+	u8				*chan_id;
+	u8				chan_count;
+	bool				enabled;
+	void				*priv_data;
+};
+
+struct qcom_flash_chip {
+	struct qcom_flash_led	*leds;
+	struct regmap_field     *r_fields[REG_MAX_COUNT];
+	struct device		*dev;
+	struct mutex		lock;
+	enum hw_type		hw_type;
+	u8			leds_count;
+	u8			max_channels;
+	u8			chan_en_bits;
+};
+
+static inline void *flash_led_get_priv_data(struct qcom_flash_led *led)
+{
+	return led->priv_data;
+}
+
+static int set_flash_module_en(struct qcom_flash_led *led, bool en)
+{
+	struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+	u8 led_mask = 0, enable;
+	int i, rc;
+
+	for (i = 0; i < led->chan_count; i++)
+		led_mask |= BIT(led->chan_id[i]);
+
+	mutex_lock(&chip->lock);
+	if (en)
+		chip->chan_en_bits |= led_mask;
+	else
+		chip->chan_en_bits &= ~led_mask;
+
+	enable = !!chip->chan_en_bits;
+	rc = regmap_field_write(chip->r_fields[REG_MODULE_EN], enable);
+	if (rc)
+		dev_err(chip->dev, "write module_en failed, rc=%d\n", rc);
+	mutex_unlock(&chip->lock);
+
+	return rc;
+}
+
+static int set_flash_current(struct qcom_flash_led *led, u32 current_ma, enum led_mode mode)
+{
+	struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+	u32 itarg_ua, ires_ua;
+	u8 shift, ires_mask = 0, ires_val = 0, chan_id;
+	int i, rc;
+
+	/*
+	 * Split the current across the channels and set the
+	 * IRESOLUTION and ITARGET registers accordingly.
+	 */
+	itarg_ua = (current_ma * UA_PER_MA) / led->chan_count + 1;
+	ires_ua = (mode == FLASH_MODE) ? FLASH_IRES_UA : TORCH_IRES_UA;
+
+	for (i = 0; i < led->chan_count; i++) {
+		u8 itarget = 0;
+
+		if (itarg_ua > ires_ua)
+			itarget = itarg_ua / ires_ua - 1;
+
+		chan_id = led->chan_id[i];
+
+		rc = regmap_fields_write(chip->r_fields[REG_ITARGET], chan_id, itarget);
+		if (rc)
+			return rc;
+
+		if (chip->hw_type == QCOM_MVFLASH_3CH) {
+			shift = chan_id * 2;
+			ires_mask |= FLASH_IRES_MASK_3CH << shift;
+			ires_val |= ((mode == FLASH_MODE) ?
+				(FLASH_IRES_12P5MA_VAL << shift) :
+				(FLASH_IRES_5MA_VAL_3CH << shift));
+		} else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+			shift = chan_id;
+			ires_mask |= FLASH_IRES_MASK_4CH << shift;
+			ires_val |= ((mode == FLASH_MODE) ?
+				(FLASH_IRES_12P5MA_VAL << shift) :
+				(FLASH_IRES_5MA_VAL_4CH << shift));
+		} else {
+			dev_err(chip->dev, "HW type %d is not supported\n", chip->hw_type);
+			return -ENOTSUPP;
+		}
+	}
+
+	return regmap_field_update_bits(chip->r_fields[REG_IRESOLUTION], ires_mask, ires_val);
+}
+
+static int set_flash_timeout(struct qcom_flash_led *led, u32 timeout_ms)
+{
+	struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+	u8 timer, chan_id;
+	int rc, i;
+
+	/* set SAFETY_TIMER for all the channels connected to the same LED */
+	timeout_ms = min_t(u32, timeout_ms, led->max_timeout_ms);
+
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+
+		timer = timeout_ms / FLASH_TIMER_STEP_MS;
+		timer = clamp_t(u8, timer, 0, FLASH_TIMER_VAL_MASK);
+
+		if (timeout_ms)
+			timer |= FLASH_TIMER_EN_BIT;
+
+		rc = regmap_fields_write(chip->r_fields[REG_CHAN_TIMER], chan_id, timer);
+		if (rc)
+			return rc;
+	}
+
+	return 0;
+}
+
+static int set_flash_strobe(struct qcom_flash_led *led, enum led_strobe strobe, bool state)
+{
+	struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+	u8 strobe_sel, chan_en, chan_id, chan_mask = 0;
+	int rc, i;
+
+	/* Set SW strobe config for all channels connected to the LED */
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+
+		if (strobe == SW_STROBE)
+			strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, SW_STROBE_VAL);
+		else
+			strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, HW_STROBE_VAL);
+
+		strobe_sel |=
+			FIELD_PREP(FLASH_HW_STROBE_TRIGGER_SEL_BIT, STROBE_LEVEL_TRIGGER_VAL) |
+			FIELD_PREP(FLASH_STROBE_POLARITY_BIT, STROBE_ACTIVE_HIGH_VAL);
+
+		rc = regmap_fields_write(chip->r_fields[REG_CHAN_STROBE], chan_id, strobe_sel);
+		if (rc)
+			return rc;
+
+		chan_mask |= BIT(chan_id);
+	}
+
+	/* Enable/disable flash channels */
+	chan_en = state ? chan_mask : 0;
+	rc = regmap_field_update_bits(chip->r_fields[REG_CHAN_EN], chan_mask, chan_en);
+	if (rc)
+		return rc;
+
+	led->enabled = state;
+	return 0;
+}
+
+static int qcom_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+	led->flash_current_ma = min_t(u32, led->max_flash_current_ma, brightness / UA_PER_MA);
+	return 0;
+}
+
+static int qcom_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+	led->flash_timeout_ms = timeout / USEC_PER_MSEC;
+	return 0;
+}
+
+static int qcom_flash_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+	int rc;
+
+	rc = set_flash_current(led, led->flash_current_ma, FLASH_MODE);
+	if (rc)
+		return rc;
+
+	rc = set_flash_timeout(led, led->flash_timeout_ms);
+	if (rc)
+		return rc;
+
+	rc = set_flash_module_en(led, state);
+	if (rc)
+		return rc;
+
+	return set_flash_strobe(led, SW_STROBE, state);
+}
+
+static int qcom_flash_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+
+	*state = led->enabled;
+	return 0;
+}
+
+static int qcom_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
+{
+	struct qcom_flash_led *led = container_of(fled_cdev, struct qcom_flash_led, flash);
+	struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+	u8 shift, chan_id, chan_mask = 0;
+	u8 ot_mask, oc_mask, uv_mask;
+	u32 val, fault_sts = 0;
+	int i, rc;
+
+	rc = regmap_field_read(chip->r_fields[REG_STATUS1], &val);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < led->chan_count; i++) {
+		chan_id = led->chan_id[i];
+		shift = chan_id * 2;
+
+		if (val & BIT(shift))
+			fault_sts |= LED_FAULT_SHORT_CIRCUIT;
+
+		chan_mask |= BIT(chan_id);
+	}
+
+	rc = regmap_field_read(chip->r_fields[REG_STATUS2], &val);
+	if (rc)
+		return rc;
+
+	if (chip->hw_type == QCOM_MVFLASH_3CH) {
+		ot_mask = FLASH_STS_3CH_OTST1 |
+			  FLASH_STS_3CH_OTST2 |
+			  FLASH_STS_3CH_OTST3 |
+			  FLASH_STS_3CH_BOB_THM_OVERLOAD;
+		oc_mask = FLASH_STS_3CH_BOB_ILIM_S1 |
+			  FLASH_STS_3CH_BOB_ILIM_S2 |
+			  FLASH_STS_3CH_BCL_IBAT;
+		uv_mask = FLASH_STS_3CH_VPH_DROOP;
+	} else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+		ot_mask = FLASH_STS_4CH_OTST2 |
+			  FLASH_STS_4CH_OTST1 |
+			  FLASH_STS_4CHG_BOB_THM_OVERLOAD;
+		oc_mask = FLASH_STS_4CH_BCL_IBAT |
+			  FLASH_STS_4CH_BOB_ILIM_S1 |
+			  FLASH_STS_4CH_BOB_ILIM_S2;
+		uv_mask = FLASH_STS_4CH_VPH_LOW;
+	}
+
+	if (val & ot_mask)
+		fault_sts |= LED_FAULT_OVER_TEMPERATURE;
+
+	if (val & oc_mask)
+		fault_sts |= LED_FAULT_OVER_CURRENT;
+
+	if (val & uv_mask)
+		fault_sts |= LED_FAULT_INPUT_VOLTAGE;
+
+	rc = regmap_field_read(chip->r_fields[REG_STATUS3], &val);
+	if (rc)
+		return rc;
+
+	if (chip->hw_type == QCOM_MVFLASH_3CH) {
+		if (val & chan_mask)
+			fault_sts |= LED_FAULT_TIMEOUT;
+	} else if (chip->hw_type == QCOM_MVFLASH_4CH) {
+		for (i = 0; i < led->chan_count; i++) {
+			chan_id = led->chan_id[i];
+			shift = chan_id * 2;
+
+			if (val & BIT(shift))
+				fault_sts |= LED_FAULT_TIMEOUT;
+		}
+	}
+
+	*fault = fault_sts;
+	return 0;
+}
+
+static int qcom_flash_led_brightness_set(struct led_classdev *led_cdev,
+					enum led_brightness brightness)
+{
+	struct led_classdev_flash *fled_cdev =
+		container_of(led_cdev, struct led_classdev_flash, led_cdev);
+	struct qcom_flash_led *led =
+		container_of(fled_cdev, struct qcom_flash_led, flash);
+	u32 current_ma = brightness * led->max_torch_current_ma / LED_FULL;
+	bool enable = !!brightness;
+	int rc;
+
+	rc = set_flash_current(led, current_ma, TORCH_MODE);
+	if (rc)
+		return rc;
+
+	/* Disable flash timeout for torch LED */
+	rc = set_flash_timeout(led, 0);
+	if (rc)
+		return rc;
+
+	rc = set_flash_module_en(led, enable);
+	if (rc)
+		return rc;
+
+	return set_flash_strobe(led, SW_STROBE, enable);
+}
+
+static const struct led_flash_ops qcom_flash_ops = {
+	.flash_brightness_set = qcom_flash_brightness_set,
+	.strobe_set = qcom_flash_strobe_set,
+	.strobe_get = qcom_flash_strobe_get,
+	.timeout_set = qcom_flash_timeout_set,
+	.fault_get = qcom_flash_fault_get,
+};
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+static int qcom_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
+{
+	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+	struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+	int rc;
+
+	rc = set_flash_module_en(led, enable);
+	if (rc)
+		return rc;
+
+	if (enable)
+		return set_flash_strobe(led, HW_STROBE, true);
+	else
+		return set_flash_strobe(led, SW_STROBE, false);
+}
+
+static enum led_brightness
+qcom_flash_intensity_to_led_brightness(struct v4l2_flash *v4l2_flash, s32 intensity)
+{
+	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+	struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+	u32 current_ma = intensity / UA_PER_MA;
+
+	current_ma = min_t(u32, current_ma, led->max_torch_current_ma);
+	if (!current_ma)
+		return LED_OFF;
+
+	return (current_ma * LED_FULL) / led->max_torch_current_ma;
+}
+
+static s32 qcom_flash_brightness_to_led_intensity(struct v4l2_flash *v4l2_flash,
+					enum led_brightness brightness)
+{
+	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+	struct qcom_flash_led *led = container_of(flash, struct qcom_flash_led, flash);
+
+	return (brightness * led->max_torch_current_ma * UA_PER_MA) / LED_FULL;
+}
+
+static const struct v4l2_flash_ops qcom_v4l2_flash_ops = {
+	.external_strobe_set = qcom_flash_external_strobe_set,
+	.intensity_to_led_brightness = qcom_flash_intensity_to_led_brightness,
+	.led_brightness_to_intensity = qcom_flash_brightness_to_led_intensity,
+};
+
+static int qcom_flash_v4l2_init(struct qcom_flash_led *led, struct fwnode_handle *fwnode)
+{
+	struct v4l2_flash_config v4l2_cfg = { 0 };
+	struct led_flash_setting *intensity = &v4l2_cfg.intensity;
+
+	if (!(led->flash.led_cdev.flags & LED_DEV_CAP_FLASH))
+		return 0;
+
+	intensity->min = intensity->step = TORCH_IRES_UA * led->chan_count;
+	intensity->max = led->max_torch_current_ma * UA_PER_MA;
+	intensity->val = min_t(u32, s->max, TORCH_CURRENT_DEFAULT_UA);
+
+	strscpy(v4l2_cfg.dev_name, led->flash.led_cdev.dev->kobj.name,
+					sizeof(v4l2_cfg.dev_name));
+
+	v4l2_cfg.has_external_strobe = true;
+	v4l2_cfg.flash_faults = LED_FAULT_INPUT_VOLTAGE |
+				LED_FAULT_OVER_CURRENT |
+				LED_FAULT_SHORT_CIRCUIT |
+				LED_FAULT_OVER_TEMPERATURE |
+				LED_FAULT_TIMEOUT;
+
+	led->v4l2_flash = v4l2_flash_init(led->chip->dev, fwnode, &led->flash,
+					&qcom_v4l2_flash_ops, &v4l2_cfg);
+	return PTR_ERR_OR_ZERO(led->v4l2_flash);
+}
+# else
+static int qcom_flash_v4l2_init(struct qcom_flash_led *led, struct fwnode_handle *fwnode)
+{
+	return 0;
+}
+#endif
+
+static int qcom_flash_register_led_device(struct device *parent,
+		struct fwnode_handle *node, struct qcom_flash_led *led)
+{
+	struct qcom_flash_chip *chip = flash_led_get_priv_data(led);
+	struct led_init_data init_data;
+	struct led_classdev_flash *flash = &led->flash;
+	struct led_flash_setting *brightness, *timeout;
+	u32 count, current_ua, timeout_us;
+	u32 channels[4];
+	int i, rc;
+
+	count = fwnode_property_count_u32(node, "led-sources");
+	if (count <= 0) {
+		dev_err(chip->dev, "No led-sources specified\n");
+		return -ENODEV;
+	}
+
+	if (count > chip->max_channels) {
+		dev_err(chip->dev, "led-sources count %u exceeds maximum channel count %u\n",
+				count, chip->max_channels);
+		return -EINVAL;
+	}
+
+	rc = fwnode_property_read_u32_array(node, "led-sources", channels, count);
+	if (rc < 0) {
+		dev_err(chip->dev, "Failed to read led-sources property, rc=%d\n", rc);
+		return rc;
+	}
+
+	led->chan_count = count;
+	led->chan_id = devm_kcalloc(chip->dev, count, sizeof(u8), GFP_KERNEL);
+	if (!led->chan_id)
+		return -ENOMEM;
+
+	for (i = 0; i < count; i++) {
+		if ((channels[i] == 0) || (channels[i] > chip->max_channels)) {
+			dev_err(chip->dev, "led-source out of HW support range [1-%u]\n",
+					chip->max_channels);
+			return -EINVAL;
+		}
+
+		/* Make chan_id indexing from 0 */
+		led->chan_id[i] = channels[i] - 1;
+	}
+
+	rc = fwnode_property_read_u32(node, "led-max-microamp", &current_ua);
+	if (rc < 0) {
+		dev_err(chip->dev, "Failed to read led-max-microamp property, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (current_ua == 0) {
+		dev_err(chip->dev, "led-max-microamp shouldn't be 0\n");
+		return -EINVAL;
+	}
+
+	current_ua = min_t(u32, current_ua, TORCH_CURRENT_MAX_UA * led->chan_count);
+	led->max_torch_current_ma = current_ua / UA_PER_MA;
+
+	if (fwnode_property_present(node, "flash-max-microamp")) {
+		flash->led_cdev.flags |= LED_DEV_CAP_FLASH;
+
+		rc = fwnode_property_read_u32(node, "flash-max-microamp", &current_ua);
+		if (rc < 0) {
+			dev_err(chip->dev, "Failed to read flash-max-microamp property, rc=%d\n",
+					rc);
+			return rc;
+		}
+
+		current_ua = min_t(u32, current_ua, FLASH_CURRENT_MAX_UA * led->chan_count);
+		current_ua = min_t(u32, current_ua, FLASH_TOTAL_CURRENT_MAX_UA);
+
+		/* Initialize flash class LED device brightness settings */
+		brightness = &flash->brightness;
+		brightness->min = brightness->step = FLASH_IRES_UA * led->chan_count;
+		brightness->max = current_ua;
+		brightness->val = min_t(u32, current_ua, FLASH_CURRENT_DEFAULT_UA);
+
+		led->max_flash_current_ma = current_ua / UA_PER_MA;
+		led->flash_current_ma = brightness->val / UA_PER_MA;
+
+		rc = fwnode_property_read_u32(node, "flash-max-timeout-us", &timeout_us);
+		if (rc < 0) {
+			dev_err(chip->dev, "Failed to read flash-max-timeout-us property, rc=%d\n",
+					rc);
+			return rc;
+		}
+
+		timeout_us = min_t(u32, timeout_us, FLASH_TIMEOUT_MAX_US);
+
+		/* Initialize flash class LED device timeout settings */
+		timeout = &flash->timeout;
+		timeout->min = timeout->step = FLASH_TIMEOUT_STEP_US;
+		timeout->val = timeout->max = timeout_us;
+
+		led->max_timeout_ms = led->flash_timeout_ms = timeout_us / USEC_PER_MSEC;
+
+		flash->ops = &qcom_flash_ops;
+	}
+
+	flash->led_cdev.brightness_set_blocking = qcom_flash_led_brightness_set;
+
+	init_data.fwnode = node;
+	init_data.devicename = NULL;
+	init_data.default_label = NULL;
+	init_data.devname_mandatory = false;
+
+	rc = devm_led_classdev_flash_register_ext(parent, flash, &init_data);
+	if (rc < 0) {
+		dev_err(chip->dev, "Register flash LED classdev failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	return qcom_flash_v4l2_init(led, node);
+}
+
+static int qcom_flash_led_probe(struct platform_device *pdev)
+{
+	struct qcom_flash_chip *chip;
+	struct qcom_flash_led *led;
+	struct fwnode_handle *child;
+	struct device *dev = &pdev->dev;
+	struct regmap *regmap;
+	struct reg_field *regs;
+	int count, i, rc;
+	u32 val, reg_base;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	regmap = dev_get_regmap(dev->parent, NULL);
+	if (!regmap) {
+		dev_err(dev, "Failed to get parent regmap\n");
+		return -EINVAL;
+	}
+
+	rc = fwnode_property_read_u32(dev->fwnode, "reg", &reg_base);
+	if (rc < 0) {
+		dev_err(dev, "Failed to get register base address, rc=%d\n", rc);
+		return rc;
+	}
+
+	rc = regmap_read(regmap, reg_base + FLASH_TYPE_REG, &val);
+	if (rc < 0) {
+		dev_err(dev, "Read flash LED module type failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (val != FLASH_TYPE_VAL) {
+		dev_err(dev, "type %#x is not a flash LED module\n", val);
+		return -ENODEV;
+	}
+
+	rc = regmap_read(regmap, reg_base + FLASH_SUBTYPE_REG, &val);
+	if (rc < 0) {
+		dev_err(dev, "Read flash LED module subtype failed, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (val == FLASH_SUBTYPE_3CH_VAL) {
+		chip->hw_type = QCOM_MVFLASH_3CH;
+		chip->max_channels = 3;
+		regs = mvflash_3ch_regs;
+	} else if (val == FLASH_SUBTYPE_4CH_VAL) {
+		chip->hw_type = QCOM_MVFLASH_4CH;
+		chip->max_channels = 4;
+		regs = mvflash_4ch_regs;
+	} else {
+		dev_err(dev, "flash LED subtype %#x is not yet supported\n", val);
+		return -ENODEV;
+	}
+
+	for (i = 0; i < REG_MAX_COUNT; i++)
+		regs[i].reg += reg_base;
+
+	rc = devm_regmap_field_bulk_alloc(dev, regmap, chip->r_fields, regs, REG_MAX_COUNT);
+	if (rc < 0) {
+		dev_err(dev, "Failed to allocate regmap field, rc=%d\n", rc);
+		return rc;
+	}
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+	mutex_init(&chip->lock);
+
+	count = device_get_child_node_count(dev);
+	if (count == 0 || count > chip->max_channels) {
+		dev_err(dev, "No child or child count exceeds %d\n", chip->max_channels);
+		return -EINVAL;
+	}
+
+	chip->leds = devm_kcalloc(dev, count, sizeof(*chip->leds), GFP_KERNEL);
+	if (!chip->leds)
+		return -ENOMEM;
+
+	device_for_each_child_node(dev, child) {
+		led = &chip->leds[chip->leds_count];
+		led->priv_data = chip;
+
+		rc = qcom_flash_register_led_device(dev, child, led);
+		if (rc < 0)
+			goto release;
+
+		chip->leds_count++;
+	}
+
+	return 0;
+
+release:
+	while (chip->leds && chip->leds_count--)
+		v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
+	return rc;
+}
+
+static int qcom_flash_led_remove(struct platform_device *pdev)
+{
+	struct qcom_flash_chip *chip = platform_get_drvdata(pdev);
+
+	while (chip->leds_count--)
+		v4l2_flash_release(chip->leds[chip->leds_count].v4l2_flash);
+
+	mutex_destroy(&chip->lock);
+	return 0;
+}
+
+static const struct of_device_id qcom_flash_led_match_table[] = {
+	{ .compatible = "qcom,spmi-flash-led" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, qcom_flash_led_match_table);
+static struct platform_driver qcom_flash_led_driver = {
+	.driver = {
+		.name = "leds-qcom-flash",
+		.of_match_table = qcom_flash_led_match_table,
+	},
+	.probe = qcom_flash_led_probe,
+	.remove = qcom_flash_led_remove,
+};
+
+module_platform_driver(qcom_flash_led_driver);
+
+MODULE_DESCRIPTION("QCOM Flash LED driver");
+MODULE_LICENSE("GPL");