Merge "leds: qpnp-flash-v2: Add support for led_fault_irq"

Documentation/devicetree/bindings/leds/leds-qpnp-flash-v2.txt

@@ -13,9 +13,25 @@ Required properties:
 - reg			: Base address and size for flash LED modules
 
 Optional properties:
+- interrupts		: Specifies the interrupts associated with flash-led.
+- interrupt-names	: Specify the interrupt names associated with interrupts.
 - qcom,hdrm-auto-mode	: Boolean type to select headroom auto mode enabled or not
-- qcom,isc-delay	: Integer type to specify short circuit delay. Valid values are 32, 64,
-			  128, 192. Unit is us.
+- qcom,isc-delay-us	: Integer type to specify short circuit delay. Valid values are 32, 64,
+			  128, 192. Unit is uS.
+- qcom,warmup-delay-us	: Integer type to specify warm up delay. Valid values are 32, 64,
+			  128, 192. Unit is uS.
+- qcom,short-circuit-det	: Boolean property which enables short circuit fault detection.
+- qcom,open-circuit-det		: Boolean property which enables open circuit fault detection.
+- qcom,vph-droop-det	: Boolean property which enables VPH droop detection.
+- qcom,vph-droop-hys-mv	: Integer property to specify VPH droop hysteresis. It is only used if
+			  qcom,vph-droop-det is specified. Valid values are 0, 25, 50 and 75.
+			  Unit is mV.
+- qcom,vph-droop-thresh-mv	: Integer property to specify VPH droop threshold. It is only used if
+				  qcom,vph-droop-det is specified. Valid values are
+				  2500 to 3200 with step size of 100. Unit is mV.
+- qcom,vph-droop-debounce-us	: Integer property to specify VPH droop debounce time. It is only used
+				  if qcom,vph-droop-det is specified. Valid values are 0, 8, 16 and 26.
+				  Unit is uS.
 - qcom,hw-strobe-option	: Integer type to specify hardware strobe option. Based on the specified
 			  value, additional GPIO configuration may be required to provide strobing
 			  support. Supported values are:
@@ -93,6 +109,22 @@ Example:
 		status = "okay";
 		reg = <0xd300 0x100>;
 		label = "flash";
+		interrupts = <0x3 0xd3 0x0 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x1 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x2 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x3 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x4 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x5 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x6 IRQ_TYPE_EDGE_BOTH>,
+			     <0x3 0xd3 0x7 IRQ_TYPE_EDGE_BOTH>;
+		interrupt-names = "led-fault-irq",
+				"mitigation-irq",
+				"flash-timer-exp-irq",
+				"all-ramp-down-done-irq",
+				"all-ramp-up-done-irq",
+				"led3-ramp-up-done-irq",
+				"led2-ramp-up-done-irq",
+				"led1-ramp-up-done-irq";
 
 		qcom,hdrm-auto-mode;
 		qcom,isc-delay = <192>;

arch/arm/boot/dts/qcom/msm-pmicobalt.dtsi

@@ -634,6 +634,10 @@
 			status = "okay";
 			reg = <0xd300 0x100>;
 			label = "flash";
+			interrupts = <0x3 0xd3 0x3 IRQ_TYPE_EDGE_RISING>,
+				     <0x3 0xd3 0x4 IRQ_TYPE_EDGE_RISING>;
+			interrupt-names = "all-ramp-down-done-irq",
+					"all-ramp-up-done-irq";
 			qcom,hdrm-auto-mode;
 			qcom,isc-delay = <192>;
 

drivers/leds/leds-qpnp-flash-v2.c

@@ -16,13 +16,20 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/of_gpio.h>
 #include <linux/gpio.h>
 #include <linux/regmap.h>
 #include <linux/platform_device.h>
+#include <linux/interrupt.h>
 #include <linux/regulator/consumer.h>
+#include <linux/leds-qpnp-flash.h>
 #include <linux/leds-qpnp-flash-v2.h>
+#include "leds.h"
 
+#define	FLASH_LED_REG_LED_STATUS1(base)		(base + 0x08)
+#define	FLASH_LED_REG_LED_STATUS2(base)		(base + 0x09)
+#define	FLASH_LED_REG_INT_RT_STS(base)		(base + 0x10)
 #define	FLASH_LED_REG_SAFETY_TMR(base)		(base + 0x40)
 #define	FLASH_LED_REG_TGR_CURRENT(base)		(base + 0x43)
 #define	FLASH_LED_REG_MOD_CTRL(base)		(base + 0x46)
@@ -32,20 +39,40 @@
 #define	FLASH_LED_EN_LED_CTRL(base)		(base + 0x4C)
 #define	FLASH_LED_REG_HDRM_PRGM(base)		(base + 0x4D)
 #define	FLASH_LED_REG_HDRM_AUTO_MODE_CTRL(base)	(base + 0x50)
+#define	FLASH_LED_REG_WARMUP_DELAY(base)	(base + 0x51)
 #define	FLASH_LED_REG_ISC_DELAY(base)		(base + 0x52)
+#define	FLASH_LED_REG_VPH_DROOP_THRESHOLD(base)	(base + 0x61)
+#define	FLASH_LED_REG_VPH_DROOP_DEBOUNCE(base)	(base + 0x62)
+#define	FLASH_LED_REG_CURRENT_DERATE_EN(base)	(base + 0x76)
 
 #define	FLASH_LED_HDRM_MODE_PRGM_MASK		GENMASK(7, 0)
 #define	FLASH_LED_HDRM_VOL_MASK			GENMASK(7, 4)
 #define	FLASH_LED_CURRENT_MASK			GENMASK(6, 0)
 #define	FLASH_LED_ENABLE_MASK			GENMASK(2, 0)
 #define	FLASH_LED_SAFETY_TMR_MASK		GENMASK(7, 0)
-#define	FLASH_LED_ISC_DELAY_MASK		GENMASK(1, 0)
+#define	FLASH_LED_INT_RT_STS_MASK		GENMASK(7, 0)
+#define	FLASH_LED_ISC_WARMUP_DELAY_MASK		GENMASK(1, 0)
+#define	FLASH_LED_CURRENT_DERATE_EN_MASK	GENMASK(2, 0)
+#define	FLASH_LED_VPH_DROOP_DEBOUNCE_MASK	GENMASK(1, 0)
+#define	FLASH_LED_VPH_DROOP_HYSTERESIS_MASK	GENMASK(5, 4)
+#define	FLASH_LED_VPH_DROOP_THRESHOLD_MASK	GENMASK(2, 0)
 #define	FLASH_LED_MOD_CTRL_MASK			BIT(7)
 #define	FLASH_LED_HW_SW_STROBE_SEL_MASK		BIT(2)
+#define	FLASH_LED_VPH_DROOP_FAULT_MASK		BIT(4)
 
-#define	FLASH_LED_HEADROOM_AUTO_MODE_ENABLED	true
-#define	FLASH_LED_ISC_DELAY_SHIFT		6
-#define	FLASH_LED_ISC_DELAY_DEFAULT_US		3
+#define	VPH_DROOP_DEBOUNCE_US_TO_VAL(val_us)	(val_us / 8)
+#define	VPH_DROOP_HYST_MV_TO_VAL(val_mv)	(val_mv / 25)
+#define	VPH_DROOP_THRESH_MV_TO_VAL(val_mv)	((val_mv / 100) - 25)
+
+#define	FLASH_LED_ISC_WARMUP_DELAY_SHIFT	6
+#define	FLASH_LED_WARMUP_DELAY_DEFAULT		2
+#define	FLASH_LED_ISC_DELAY_DEFAULT		3
+#define	FLASH_LED_VPH_DROOP_DEBOUNCE_DEFAULT	2
+#define	FLASH_LED_VPH_DROOP_HYST_DEFAULT	2
+#define	FLASH_LED_VPH_DROOP_THRESH_DEFAULT	5
+#define	FLASH_LED_VPH_DROOP_DEBOUNCE_MAX	3
+#define	FLASH_LED_VPH_DROOP_HYST_MAX		3
+#define	FLASH_LED_VPH_DROOP_THRESH_MAX		7
 #define	FLASH_LED_SAFETY_TMR_VAL_OFFSET		1
 #define	FLASH_LED_SAFETY_TMR_VAL_DIVISOR	10
 #define	FLASH_LED_SAFETY_TMR_ENABLE		BIT(7)
@@ -69,6 +96,9 @@
 #define	FLASH_LED_SAFETY_TMR_DISABLED		0x13
 #define	FLASH_LED_MIN_CURRENT_MA		25
 
+/* notifier call chain for flash-led irqs */
+static ATOMIC_NOTIFIER_HEAD(irq_notifier_list);
+
 enum flash_led_type {
 	FLASH_LED_TYPE_FLASH,
 	FLASH_LED_TYPE_TORCH,
@@ -125,7 +155,15 @@ struct flash_switch_data {
  * Flash LED configuration read from device tree
  */
 struct flash_led_platform_data {
-	u8				isc_delay_us;
+	int	all_ramp_up_done_irq;
+	int	all_ramp_down_done_irq;
+	int	led_fault_irq;
+	u8	isc_delay;
+	u8	warmup_delay;
+	u8	current_derate_en_cfg;
+	u8	vph_droop_threshold;
+	u8	vph_droop_hysteresis;
+	u8	vph_droop_debounce;
 	u8	hw_strobe_option;
 	bool	hdrm_auto_mode_en;
 };
@@ -146,6 +184,24 @@ struct qpnp_flash_led {
 	u16				base;
 };
 
+static int
+qpnp_flash_led_read(struct qpnp_flash_led *led, u16 addr, u8 *data)
+{
+	int rc;
+	uint val;
+
+	rc = regmap_read(led->regmap, addr, &val);
+	if (rc < 0)
+		dev_err(&led->pdev->dev, "Unable to read from 0x%04X rc = %d\n",
+			addr, rc);
+	else
+		dev_dbg(&led->pdev->dev, "Read 0x%02X from addr 0x%04X\n",
+			val, addr);
+
+	*data = (u8)val;
+	return rc;
+}
+
 static int
 qpnp_flash_led_masked_write(struct qpnp_flash_led *led, u16 addr, u8 mask,
 								u8 val)
@@ -154,11 +210,10 @@ qpnp_flash_led_masked_write(struct qpnp_flash_led *led, u16 addr, u8 mask,
 
 	rc = regmap_update_bits(led->regmap, addr, mask, val);
 	if (rc < 0)
-		dev_err(&led->pdev->dev,
-			"Unable to update bits from 0x%02X, rc = %d\n",
+		dev_err(&led->pdev->dev, "Unable to update bits from 0x%04X, rc = %d\n",
 			addr, rc);
 	else
-		dev_dbg(&led->pdev->dev, "Wrote 0x%02X to addr 0x%02X\n",
+		dev_dbg(&led->pdev->dev, "Wrote 0x%02X to addr 0x%04X\n",
 			val, addr);
 
 	return rc;
@@ -195,7 +250,43 @@ static int qpnp_flash_led_init_settings(struct qpnp_flash_led *led)
 
 	rc = qpnp_flash_led_masked_write(led,
 			FLASH_LED_REG_ISC_DELAY(led->base),
-			FLASH_LED_ISC_DELAY_MASK, led->pdata->isc_delay_us);
+			FLASH_LED_ISC_WARMUP_DELAY_MASK,
+			led->pdata->isc_delay);
+	if (rc < 0)
+		return rc;
+
+	rc = qpnp_flash_led_masked_write(led,
+			FLASH_LED_REG_WARMUP_DELAY(led->base),
+			FLASH_LED_ISC_WARMUP_DELAY_MASK,
+			led->pdata->warmup_delay);
+	if (rc < 0)
+		return rc;
+
+	rc = qpnp_flash_led_masked_write(led,
+			FLASH_LED_REG_CURRENT_DERATE_EN(led->base),
+			FLASH_LED_CURRENT_DERATE_EN_MASK,
+			led->pdata->current_derate_en_cfg);
+	if (rc < 0)
+		return rc;
+
+	rc = qpnp_flash_led_masked_write(led,
+			FLASH_LED_REG_VPH_DROOP_DEBOUNCE(led->base),
+			FLASH_LED_VPH_DROOP_DEBOUNCE_MASK,
+			led->pdata->vph_droop_debounce);
+	if (rc < 0)
+		return rc;
+
+	rc = qpnp_flash_led_masked_write(led,
+			FLASH_LED_REG_VPH_DROOP_THRESHOLD(led->base),
+			FLASH_LED_VPH_DROOP_THRESHOLD_MASK,
+			led->pdata->vph_droop_threshold);
+	if (rc < 0)
+		return rc;
+
+	rc = qpnp_flash_led_masked_write(led,
+			FLASH_LED_REG_VPH_DROOP_THRESHOLD(led->base),
+			FLASH_LED_VPH_DROOP_HYSTERESIS_MASK,
+			led->pdata->vph_droop_hysteresis);
 	if (rc < 0)
 		return rc;
 
@@ -459,13 +550,21 @@ static int qpnp_flash_led_switch_set(struct flash_switch_data *snode, bool on)
 	return 0;
 }
 
-int qpnp_flash_led_prepare(struct led_classdev *led_cdev, int options)
+int qpnp_flash_led_prepare(struct led_trigger *trig, int options)
 {
-	struct flash_switch_data *snode =
-			container_of(led_cdev, struct flash_switch_data, cdev);
-	struct qpnp_flash_led *led = dev_get_drvdata(&snode->pdev->dev);
+	struct led_classdev *led_cdev = trigger_to_lcdev(trig);
+	struct flash_switch_data *snode;
+	struct qpnp_flash_led *led;
 	int rc, val = 0;
 
+	if (!led_cdev) {
+		pr_err("Invalid led_trigger provided\n");
+		return -EINVAL;
+	}
+
+	snode = container_of(led_cdev, struct flash_switch_data, cdev);
+	led = dev_get_drvdata(&snode->pdev->dev);
+
 	if (!(options & (ENABLE_REGULATOR | QUERY_MAX_CURRENT))) {
 		dev_err(&led->pdev->dev, "Invalid options %d\n", options);
 		return -EINVAL;
@@ -521,6 +620,77 @@ static void qpnp_flash_led_brightness_set(struct led_classdev *led_cdev,
 	spin_unlock(&led->lock);
 }
 
+/* irq handler */
+static irqreturn_t qpnp_flash_led_irq_handler(int irq, void *_led)
+{
+	struct qpnp_flash_led *led = _led;
+	enum flash_led_irq_type irq_type = INVALID_IRQ;
+	int rc;
+	u8 irq_status, led_status1, led_status2;
+
+	dev_dbg(&led->pdev->dev, "irq received, irq=%d\n", irq);
+
+	rc = qpnp_flash_led_read(led,
+			FLASH_LED_REG_INT_RT_STS(led->base), &irq_status);
+	if (rc < 0) {
+		dev_err(&led->pdev->dev, "Failed to read interrupt status reg, rc=%d\n",
+				rc);
+		goto exit;
+	}
+
+	if (irq == led->pdata->all_ramp_up_done_irq)
+		irq_type = ALL_RAMP_UP_DONE_IRQ;
+	else if (irq == led->pdata->all_ramp_down_done_irq)
+		irq_type = ALL_RAMP_DOWN_DONE_IRQ;
+	else if (irq == led->pdata->led_fault_irq)
+		irq_type = LED_FAULT_IRQ;
+
+	if (irq_type == ALL_RAMP_UP_DONE_IRQ)
+		atomic_notifier_call_chain(&irq_notifier_list,
+						irq_type, NULL);
+
+	if (irq_type == LED_FAULT_IRQ) {
+		rc = qpnp_flash_led_read(led,
+			FLASH_LED_REG_LED_STATUS1(led->base), &led_status1);
+		if (rc < 0) {
+			dev_err(&led->pdev->dev, "Failed to read led_status1 reg, rc=%d\n",
+					rc);
+			goto exit;
+		}
+
+		rc = qpnp_flash_led_read(led,
+			FLASH_LED_REG_LED_STATUS2(led->base), &led_status2);
+		if (rc < 0) {
+			dev_err(&led->pdev->dev, "Failed to read led_status2 reg, rc=%d\n",
+					rc);
+			goto exit;
+		}
+
+		if (led_status1)
+			dev_emerg(&led->pdev->dev, "led short/open fault detected! led_status1=%x\n",
+					led_status1);
+
+		if (led_status2 & FLASH_LED_VPH_DROOP_FAULT_MASK)
+			dev_emerg(&led->pdev->dev, "led vph_droop fault detected!\n");
+	}
+
+	dev_dbg(&led->pdev->dev, "irq handled, irq_type=%x, irq_status=%x\n",
+		irq_type, irq_status);
+
+exit:
+	return IRQ_HANDLED;
+}
+
+int qpnp_flash_led_register_irq_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_register(&irq_notifier_list, nb);
+}
+
+int qpnp_flash_led_unregister_irq_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_unregister(&irq_notifier_list, nb);
+}
+
 static int qpnp_flash_led_regulator_setup(struct qpnp_flash_led *led,
 				struct flash_switch_data *snode, bool on)
 {
@@ -901,28 +1071,116 @@ static int qpnp_flash_led_parse_common_dt(struct qpnp_flash_led *led,
 {
 	int rc;
 	u32 val;
+	bool short_circuit_det, open_circuit_det, vph_droop_det;
 
-	led->pdata->hdrm_auto_mode_en = FLASH_LED_HEADROOM_AUTO_MODE_ENABLED;
 	led->pdata->hdrm_auto_mode_en = of_property_read_bool(node,
 							"qcom,hdrm-auto-mode");
 
-	led->pdata->isc_delay_us = FLASH_LED_ISC_DELAY_DEFAULT_US;
-	rc = of_property_read_u32(node, "qcom,isc-delay", &val);
+	led->pdata->isc_delay = FLASH_LED_ISC_DELAY_DEFAULT;
+	rc = of_property_read_u32(node, "qcom,isc-delay-us", &val);
 	if (!rc) {
-		led->pdata->isc_delay_us = val >> FLASH_LED_ISC_DELAY_SHIFT;
+		led->pdata->isc_delay =
+				val >> FLASH_LED_ISC_WARMUP_DELAY_SHIFT;
 	} else if (rc != -EINVAL) {
-		dev_err(&led->pdev->dev, "Unable to read ISC delay\n");
+		dev_err(&led->pdev->dev,
+				"Unable to read ISC delay, rc=%d\n", rc);
 		return rc;
 	}
 
+	led->pdata->warmup_delay = FLASH_LED_WARMUP_DELAY_DEFAULT;
+	rc = of_property_read_u32(node, "qcom,warmup-delay-us", &val);
+	if (!rc) {
+		led->pdata->warmup_delay =
+				val >> FLASH_LED_ISC_WARMUP_DELAY_SHIFT;
+	} else if (rc != -EINVAL) {
+		dev_err(&led->pdev->dev,
+				"Unable to read WARMUP delay, rc=%d\n", rc);
+		return rc;
+	}
+
+	short_circuit_det =
+		of_property_read_bool(node, "qcom,short-circuit-det");
+	open_circuit_det = of_property_read_bool(node, "qcom,open-circuit-det");
+	vph_droop_det = of_property_read_bool(node, "qcom,vph-droop-det");
+	led->pdata->current_derate_en_cfg = (vph_droop_det << 2) |
+				(open_circuit_det << 1) | short_circuit_det;
+
+	led->pdata->vph_droop_debounce = FLASH_LED_VPH_DROOP_DEBOUNCE_DEFAULT;
+	rc = of_property_read_u32(node, "qcom,vph-droop-debounce-us", &val);
+	if (!rc) {
+		led->pdata->vph_droop_debounce =
+			VPH_DROOP_DEBOUNCE_US_TO_VAL(val);
+	} else if (rc != -EINVAL) {
+		dev_err(&led->pdev->dev,
+			"Unable to read VPH droop debounce, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (led->pdata->vph_droop_debounce > FLASH_LED_VPH_DROOP_DEBOUNCE_MAX) {
+		dev_err(&led->pdev->dev,
+				"Invalid VPH droop debounce specified");
+		return -EINVAL;
+	}
+
+	led->pdata->vph_droop_threshold = FLASH_LED_VPH_DROOP_THRESH_DEFAULT;
+	rc = of_property_read_u32(node, "qcom,vph-droop-threshold-mv", &val);
+	if (!rc) {
+		led->pdata->vph_droop_threshold =
+			VPH_DROOP_THRESH_MV_TO_VAL(val);
+	} else if (rc != -EINVAL) {
+		dev_err(&led->pdev->dev,
+			"Unable to read VPH droop threshold, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (led->pdata->vph_droop_threshold > FLASH_LED_VPH_DROOP_THRESH_MAX) {
+		dev_err(&led->pdev->dev,
+				"Invalid VPH droop threshold specified");
+		return -EINVAL;
+	}
+
+	led->pdata->vph_droop_hysteresis =
+			FLASH_LED_VPH_DROOP_HYST_DEFAULT;
+	rc = of_property_read_u32(node, "qcom,vph-droop-hysteresis-mv", &val);
+	if (!rc) {
+		led->pdata->vph_droop_hysteresis =
+			VPH_DROOP_HYST_MV_TO_VAL(val);
+	} else if (rc != -EINVAL) {
+		dev_err(&led->pdev->dev,
+			"Unable to read VPH droop hysteresis, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (led->pdata->vph_droop_hysteresis > FLASH_LED_VPH_DROOP_HYST_MAX) {
+		dev_err(&led->pdev->dev,
+				"Invalid VPH droop hysteresis specified");
+		return -EINVAL;
+	}
+
 	rc = of_property_read_u32(node, "qcom,hw-strobe-option", &val);
 	if (!rc) {
 		led->pdata->hw_strobe_option = (u8)val;
 	} else if (rc != -EINVAL) {
-		dev_err(&led->pdev->dev, "Unable to parse hw strobe option\n");
+		dev_err(&led->pdev->dev,
+			"Unable to parse hw strobe option, rc=%d\n", rc);
 		return rc;
 	}
 
+	led->pdata->all_ramp_up_done_irq =
+		of_irq_get_byname(node, "all-ramp-up-done-irq");
+	if (led->pdata->all_ramp_up_done_irq < 0)
+		dev_dbg(&led->pdev->dev, "all-ramp-up-done-irq not used\n");
+
+	led->pdata->all_ramp_down_done_irq =
+		of_irq_get_byname(node, "all-ramp-down-done-irq");
+	if (led->pdata->all_ramp_down_done_irq < 0)
+		dev_dbg(&led->pdev->dev, "all-ramp-down-done-irq not used\n");
+
+	led->pdata->led_fault_irq =
+		of_irq_get_byname(node, "led-fault-irq");
+	if (led->pdata->led_fault_irq < 0)
+		dev_dbg(&led->pdev->dev, "led-fault-irq not used\n");
+
 	return 0;
 }
 
@@ -1033,6 +1291,49 @@ static int qpnp_flash_led_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* setup irqs */
+	if (led->pdata->all_ramp_up_done_irq >= 0) {
+		rc = devm_request_threaded_irq(&led->pdev->dev,
+			led->pdata->all_ramp_up_done_irq,
+			NULL, qpnp_flash_led_irq_handler,
+			IRQF_ONESHOT,
+			"qpnp_flash_led_all_ramp_up_done_irq", led);
+		if (rc < 0) {
+			dev_err(&pdev->dev,
+				"Unable to request all_ramp_up_done(%d) IRQ(err:%d)\n",
+				led->pdata->all_ramp_up_done_irq, rc);
+			return rc;
+		}
+	}
+
+	if (led->pdata->all_ramp_down_done_irq >= 0) {
+		rc = devm_request_threaded_irq(&led->pdev->dev,
+			led->pdata->all_ramp_down_done_irq,
+			NULL, qpnp_flash_led_irq_handler,
+			IRQF_ONESHOT,
+			"qpnp_flash_led_all_ramp_down_done_irq", led);
+		if (rc < 0) {
+			dev_err(&pdev->dev,
+				"Unable to request all_ramp_down_done(%d) IRQ(err:%d)\n",
+				led->pdata->all_ramp_down_done_irq, rc);
+			return rc;
+		}
+	}
+
+	if (led->pdata->led_fault_irq >= 0) {
+		rc = devm_request_threaded_irq(&led->pdev->dev,
+			led->pdata->led_fault_irq,
+			NULL, qpnp_flash_led_irq_handler,
+			IRQF_ONESHOT,
+			"qpnp_flash_led_fault_irq", led);
+		if (rc < 0) {
+			dev_err(&pdev->dev,
+				"Unable to request led_fault(%d) IRQ(err:%d)\n",
+				led->pdata->led_fault_irq, rc);
+			return rc;
+		}
+	}
+
 	rc = qpnp_flash_led_init_settings(led);
 	if (rc < 0) {
 		dev_err(&pdev->dev,

drivers/leds/leds-qpnp-flash.c

@@ -26,11 +26,12 @@
 #include <linux/regulator/consumer.h>
 #include <linux/workqueue.h>
 #include <linux/power_supply.h>
+#include <linux/leds-qpnp-flash.h>
 #include <linux/qpnp/qpnp-adc.h>
 #include <linux/qpnp/qpnp-revid.h>
-#include "leds.h"
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
+#include "leds.h"
 
 #define FLASH_LED_PERIPHERAL_SUBTYPE(base)			(base + 0x05)
 #define FLASH_SAFETY_TIMER(base)				(base + 0x40)
@@ -1154,6 +1155,47 @@ error_regulator_enable:
 	return rc;
 }
 
+int qpnp_flash_led_prepare(struct led_trigger *trig, int options)
+{
+	struct led_classdev *led_cdev = trigger_to_lcdev(trig);
+	struct flash_node_data *flash_node;
+	struct qpnp_flash_led *led;
+	int rc, val = 0;
+
+	if (!led_cdev) {
+		pr_err("Invalid led_trigger provided\n");
+		return -EINVAL;
+	}
+
+	flash_node = container_of(led_cdev, struct flash_node_data, cdev);
+	led = dev_get_drvdata(&flash_node->pdev->dev);
+
+	if (!(options & (ENABLE_REGULATOR | QUERY_MAX_CURRENT))) {
+		dev_err(&led->pdev->dev, "Invalid options %d\n", options);
+		return -EINVAL;
+	}
+
+	if (options & ENABLE_REGULATOR) {
+		rc = flash_regulator_enable(led, flash_node, true);
+		if (rc < 0) {
+			dev_err(&led->pdev->dev,
+				"enable regulator failed, rc=%d\n", rc);
+			return rc;
+		}
+	}
+
+	if (options & QUERY_MAX_CURRENT) {
+		val = qpnp_flash_led_get_max_avail_current(flash_node, led);
+		if (val < 0) {
+			dev_err(&led->pdev->dev,
+				"query max current failed, rc=%d\n", val);
+			return val;
+		}
+	}
+
+	return val;
+}
+
 static void qpnp_flash_led_work(struct work_struct *work)
 {
 	struct flash_node_data *flash_node = container_of(work,

drivers/leds/leds.h

@@ -44,6 +44,22 @@ static inline int led_get_brightness(struct led_classdev *led_cdev)
 	return led_cdev->brightness;
 }
 
+static inline struct led_classdev *trigger_to_lcdev(struct led_trigger *trig)
+{
+	struct led_classdev *led_cdev;
+
+	read_lock(&trig->leddev_list_lock);
+	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) {
+		if (!strcmp(led_cdev->default_trigger, trig->name)) {
+			read_unlock(&trig->leddev_list_lock);
+			return led_cdev;
+		}
+	}
+
+	read_unlock(&trig->leddev_list_lock);
+	return NULL;
+}
+
 void led_init_core(struct led_classdev *led_cdev);
 void led_stop_software_blink(struct led_classdev *led_cdev);
 

include/linux/leds-qpnp-flash-v2.h

@@ -14,11 +14,21 @@
 #define __LEDS_QPNP_FLASH_V2_H
 
 #include <linux/leds.h>
-#include "leds.h"
+#include <linux/notifier.h>
 
-#define ENABLE_REGULATOR	BIT(0)
-#define QUERY_MAX_CURRENT	BIT(1)
+enum flash_led_irq_type {
+	LED_FAULT_IRQ = BIT(0),
+	MITIGATION_IRQ = BIT(1),
+	FLASH_TIMER_EXP_IRQ = BIT(2),
+	ALL_RAMP_DOWN_DONE_IRQ = BIT(3),
+	ALL_RAMP_UP_DONE_IRQ = BIT(4),
+	LED3_RAMP_UP_DONE_IRQ = BIT(5),
+	LED2_RAMP_UP_DONE_IRQ = BIT(6),
+	LED1_RAMP_UP_DONE_IRQ = BIT(7),
+	INVALID_IRQ = BIT(8),
+};
 
-int qpnp_flash_led_prepare(struct led_classdev *led_cdev, int options);
+int qpnp_flash_led_register_irq_notifier(struct notifier_block *nb);
+int qpnp_flash_led_unregister_irq_notifier(struct notifier_block *nb);
 
 #endif

include/linux/leds-qpnp-flash.h

@@ -0,0 +1,23 @@
+/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __LEDS_QPNP_FLASH_H
+#define __LEDS_QPNP_FLASH_H
+
+#include <linux/leds.h>
+
+#define ENABLE_REGULATOR	BIT(0)
+#define QUERY_MAX_CURRENT	BIT(1)
+
+int qpnp_flash_led_prepare(struct led_trigger *trig, int options);
+
+#endif