@@ -0,0 +1,1251 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Qualcomm SPMI Flash LEDs Driver
+ *
+ * Copyright (c) 2020-2021, Nícolas F. R. A. Prado <n@nfraprado.net>
+ * Copyright (c) 2021, Collabora Ltd.
+ *
+ * Based on QPNP LEDs driver from downstream MSM kernel sources.
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spmi.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#define QCOM_FLASH_ADDR_PERIPHERAL_SUBTYPE 0x05
+#define QCOM_FLASH_ADDR_STATUS 0x10
+#define QCOM_FLASH_ADDR_SAFETY_TIMER 0x40
+#define QCOM_FLASH_ADDR_MAX_CURR 0x41
+#define QCOM_FLASH_ADDR_CURR_LED0 0x42
+#define QCOM_FLASH_ADDR_CURR_LED1 0x43
+#define QCOM_FLASH_ADDR_CLAMP_CURR 0x44
+#define QCOM_FLASH_ADDR_ENABLE_CONTROL 0x46
+#define QCOM_FLASH_ADDR_LED_STROBE_CTRL 0x47
+#define QCOM_FLASH_ADDR_LED_TMR_CTRL 0x48
+#define QCOM_FLASH_ADDR_HEADROOM 0x4A
+#define QCOM_FLASH_ADDR_STARTUP_DELAY 0x4B
+#define QCOM_FLASH_ADDR_MASK_ENABLE 0x4C
+#define QCOM_FLASH_ADDR_VREG_OK_FORCE 0x4F
+#define QCOM_FLASH_ADDR_LED_UNLOCK_SECURE 0xD0
+#define QCOM_FLASH_ADDR_LED_TORCH 0xE4
+#define QCOM_FLASH_ADDR_FAULT_DETECT 0x51
+#define QCOM_FLASH_ADDR_RAMP_RATE 0x54
+#define QCOM_FLASH_ADDR_VPH_PWR_DROOP 0x5A
+
+#define QCOM_FLASH_MAX_LEVEL 0x4F
+#define QCOM_FLASH_TORCH_MAX_LEVEL 0x0F
+#define QCOM_FLASH_NO_MASK 0x00
+
+#define QCOM_FLASH_MASK_1 0x20
+#define QCOM_FLASH_MASK_REG_MASK 0xE0
+#define QCOM_FLASH_HEADROOM_MASK 0x03
+#define QCOM_FLASH_SAFETY_TIMER_MASK 0x7F
+#define QCOM_FLASH_CURRENT_MASK 0xFF
+#define QCOM_FLASH_MAX_CURRENT_MASK 0x7F
+#define QCOM_FLASH_TMR_MASK 0x03
+#define QCOM_FLASH_TMR_WATCHDOG 0x03
+#define QCOM_FLASH_TMR_SAFETY 0x00
+#define QCOM_FLASH_FAULT_DETECT_MASK 0x80
+#define QCOM_FLASH_HW_VREG_OK 0x40
+#define QCOM_FLASH_VREG_MASK 0xC0
+#define QCOM_FLASH_STARTUP_DLY_MASK 0x02
+#define QCOM_FLASH_RAMP_RATE_MASK 0xBF
+#define QCOM_FLASH_VPH_PWR_DROOP_MASK 0xF3
+
+#define QCOM_FLASH_ENABLE_ALL 0xE0
+#define QCOM_FLASH_ENABLE_MODULE 0x80
+#define QCOM_FLASH_ENABLE_MODULE_MASK 0x80
+#define QCOM_FLASH_DISABLE_ALL 0x00
+#define QCOM_FLASH_ENABLE_MASK 0xE0
+#define QCOM_FLASH_ENABLE_LED0 0xC0
+#define QCOM_FLASH_ENABLE_LED1 0xA0
+#define QCOM_FLASH_INIT_MASK 0xE0
+#define QCOM_FLASH_SELFCHECK_ENABLE 0x80
+#define QCOM_FLASH_SELFCHECK_DISABLE 0x00
+
+#define QCOM_FLASH_STROBE_SW 0xC0
+#define QCOM_FLASH_STROBE_HW 0x04
+#define QCOM_FLASH_STROBE_MASK 0xC7
+#define QCOM_FLASH_STROBE_LED0 0x80
+#define QCOM_FLASH_STROBE_LED1 0x40
+
+#define QCOM_FLASH_TORCH_MASK 0x03
+#define QCOM_FLASH_LED_TORCH_ENABLE 0x00
+#define QCOM_FLASH_LED_TORCH_DISABLE 0x03
+#define QCOM_FLASH_UNLOCK_SECURE 0xA5
+#define QCOM_FLASH_SECURE_MASK 0xFF
+
+#define QCOM_FLASH_SUBTYPE_DUAL 0x01
+#define QCOM_FLASH_SUBTYPE_SINGLE 0x02
+
+#define QCOM_FLASH_DURATION_STEP 10000
+#define QCOM_FLASH_DURATION_MIN 10000
+#define QCOM_FLASH_DURATION_DEFAULT 200000
+
+#define QCOM_FLASH_CURRENT_STEP 12500
+#define QCOM_FLASH_CURRENT_MIN 12500
+
+#define QCOM_FLASH_DEFAULT_CLAMP 200000
+
+#define QCOM_FLASH_MASK_ON_LED0 0x8
+#define QCOM_FLASH_MASK_ON_LED1 0x2
+#define QCOM_FLASH_MASK_STATUS_TIMEDOUT 0x5
+
+enum qcom_flash_headroom {
+ QCOM_FLASH_HEADROOM_250MV,
+ QCOM_FLASH_HEADROOM_300MV,
+ QCOM_FLASH_HEADROOM_400MV,
+ QCOM_FLASH_HEADROOM_500MV,
+};
+
+enum qcom_flash_startup_dly {
+ QCOM_FLASH_STARTUP_DLY_10US,
+ QCOM_FLASH_STARTUP_DLY_32US,
+ QCOM_FLASH_STARTUP_DLY_64US,
+ QCOM_FLASH_STARTUP_DLY_128US,
+};
+
+enum qcom_flash_ids {
+ QCOM_FLASH_ID_LED0,
+ QCOM_FLASH_ID_LED1,
+};
+
+/**
+ * struct qcom_flash_led - Represents each individual flash LED
+ * @fled_cdev: flash LED classdev
+ * @id: LED ID as given by enum qcom_flash_ids
+ * @default_on: default state for the LED
+ * @flash_enable_cmd: enable command for particular flash
+ * @flash_strobe_cmd: strobe command for particular flash
+ * @current_addr: address to write for current
+ * @mask_led_on: bitmask for STATUS register that shows if LED is on
+ * @flash_current_invalidated: whether the flash current in the current register
+ * was invalidated by torch usage
+ */
+struct qcom_flash_led {
+ struct led_classdev_flash fled_cdev;
+ enum qcom_flash_ids id;
+ bool default_on;
+ u8 flash_enable_cmd;
+ u8 flash_strobe_cmd;
+ u16 current_addr;
+ u8 mask_led_on;
+ bool flash_current_invalidated;
+};
+
+/**
+ * struct qcom_flash_device - QCOM SPMI Flash device, contains 2 flash LEDs
+ * @regmap: regmap used to access LED registers over SPMI
+ * @base: base register given in device tree
+ * @dev: device from devicetree
+ * @flash_supply: voltage regulator to supply the flashes
+ * @torch_supply: voltage regulator to supply torch mode
+ * @leds: flash LEDs
+ * @num_leds: number of LEDs registered (between 0 and 2)
+ * @lock: lock to protect SPMI transactions
+ * @torch_enable_cmd: enable flash LED torch mode
+ * @peripheral_subtype: module peripheral subtype
+ * @flash_regulator_on: flash regulator status
+ * @torch_regulator_on: torch regulator status
+ * @torch_enabled: whether torch mode is enabled
+ */
+struct qcom_flash_device {
+ struct regmap *regmap;
+ unsigned int base;
+ struct device *dev;
+ struct regulator *flash_supply;
+ struct regulator *torch_supply;
+ struct qcom_flash_led leds[2];
+ u8 num_leds;
+ struct mutex lock;
+ u8 torch_enable_cmd;
+ unsigned int peripheral_subtype;
+ bool flash_regulator_on;
+ bool torch_regulator_on;
+ bool torch_enabled;
+};
+
+struct qcom_flash_config {
+ unsigned int base;
+ struct regulator *flash_supply;
+ struct regulator *torch_supply;
+ unsigned int num_leds;
+
+ enum qcom_flash_ids id[2];
+ bool default_on[2];
+ u32 led_max_brightness[2];
+ u32 flash_max_brightness[2];
+ u32 flash_max_timeout[2];
+};
+
+static inline struct qcom_flash_led *flcdev_to_led(struct led_classdev_flash *fled_cdev)
+{
+ return container_of(fled_cdev, struct qcom_flash_led, fled_cdev);
+}
+
+static inline struct qcom_flash_device *led_to_leds_dev(struct qcom_flash_led *led)
+{
+ return container_of(led, struct qcom_flash_device, leds[led->id]);
+}
+
+static inline int qcom_flash_read_reg(struct qcom_flash_device *leds_dev,
+ unsigned int reg, unsigned int *val)
+{
+ return regmap_read(leds_dev->regmap, leds_dev->base + reg, val);
+}
+
+static inline int qcom_flash_masked_write(struct qcom_flash_device *leds_dev,
+ unsigned int reg, unsigned int mask,
+ unsigned int val)
+{
+ return regmap_update_bits(leds_dev->regmap, leds_dev->base + reg, mask,
+ val);
+}
+
+static u8 qcom_flash_duration_to_reg(u32 us)
+{
+ if (us < QCOM_FLASH_DURATION_MIN)
+ us = QCOM_FLASH_DURATION_MIN;
+ return (us - QCOM_FLASH_DURATION_MIN) / QCOM_FLASH_DURATION_STEP;
+}
+
+static u8 qcom_flash_current_to_reg(u32 ua)
+{
+ if (ua < QCOM_FLASH_CURRENT_MIN)
+ ua = QCOM_FLASH_CURRENT_MIN;
+ return (ua - QCOM_FLASH_CURRENT_MIN) / QCOM_FLASH_CURRENT_STEP;
+}
+
+static void clamp_align(u32 *v, u32 min, u32 max, u32 step)
+{
+ *v = clamp_val(*v, min, max);
+ if (step > 1)
+ *v = (*v - min) / step * step + min;
+}
+
+static int qcom_flash_status_get(struct qcom_flash_led *led)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ unsigned int status;
+ int rc;
+
+ rc = qcom_flash_read_reg(leds_dev, QCOM_FLASH_ADDR_STATUS, &status);
+ if (rc) {
+ dev_err(leds_dev->dev, "Failure reading status, rc = %d\n",
+ rc);
+ return rc;
+ }
+
+ return status & led->mask_led_on;
+}
+
+static int qcom_flash_status_clear(struct qcom_flash_device *leds_dev)
+{
+ unsigned int enable_val;
+ int rc;
+
+ rc = qcom_flash_read_reg(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ &enable_val);
+ if (rc) {
+ dev_err(leds_dev->dev, "Enable reg read failed(%d)\n", rc);
+ return rc;
+ }
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MASK, QCOM_FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(leds_dev->dev, "Enable reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MASK, enable_val);
+ if (rc) {
+ dev_err(leds_dev->dev, "Enable reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int qcom_flash_check_timedout(struct qcom_flash_device *leds_dev)
+{
+ unsigned int status;
+ int rc;
+
+ rc = qcom_flash_read_reg(leds_dev, QCOM_FLASH_ADDR_STATUS, &status);
+ if (rc) {
+ dev_err(leds_dev->dev, "Failure reading status, rc = %d\n",
+ rc);
+ return rc;
+ }
+
+ return status & QCOM_FLASH_MASK_STATUS_TIMEDOUT;
+}
+
+static int qcom_flash_torch_reg_enable(struct qcom_flash_device *leds_dev,
+ bool state)
+{
+ int rc;
+
+ if (leds_dev->torch_enabled == state)
+ return 0;
+
+ /*
+ * For the TORCH register (0xE4) to become writable, the UNLOCK_SECURE
+ * register (0xD0) needs to be written with the UNLOCK_SECURE value
+ * (0xA5) first.
+ * It gets re-locked after any register write.
+ */
+ rc = qcom_flash_masked_write(leds_dev,
+ QCOM_FLASH_ADDR_LED_UNLOCK_SECURE,
+ QCOM_FLASH_SECURE_MASK,
+ QCOM_FLASH_UNLOCK_SECURE);
+ if (rc) {
+ dev_err(leds_dev->dev, "Secure reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_TORCH,
+ QCOM_FLASH_TORCH_MASK,
+ state ? QCOM_FLASH_LED_TORCH_ENABLE :
+ QCOM_FLASH_LED_TORCH_DISABLE);
+ if (rc) {
+ dev_err(leds_dev->dev, "Torch reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int qcom_flash_max_brightness_set(struct qcom_flash_led *led,
+ unsigned int brightness)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct device *dev = leds_dev->dev;
+ int rc;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_MAX_CURR,
+ QCOM_FLASH_CURRENT_MASK, brightness);
+ if (rc) {
+ dev_err(dev, "Max current reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int qcom_flash_brightness_set(struct qcom_flash_led *led,
+ unsigned int brightness)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct device *dev = leds_dev->dev;
+ int rc;
+
+ rc = qcom_flash_masked_write(leds_dev, led->current_addr,
+ QCOM_FLASH_CURRENT_MASK, brightness);
+ if (rc) {
+ dev_err(dev, "Current reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int qcom_flash_fled_regulator_on(struct qcom_flash_device *leds_dev)
+{
+ int rc;
+
+ if (leds_dev->flash_regulator_on)
+ return 0;
+
+ rc = regulator_enable(leds_dev->flash_supply);
+ if (rc) {
+ dev_err(leds_dev->dev, "Regulator enable failed(%d)\n", rc);
+ return rc;
+ }
+
+ leds_dev->flash_regulator_on = true;
+
+ return 0;
+}
+
+static int qcom_flash_fled_regulator_off(struct qcom_flash_device *leds_dev)
+{
+ unsigned int i;
+ u8 enable = 0;
+ int rc;
+
+ if (!leds_dev->flash_regulator_on)
+ return 0;
+
+ for (i = 0; i < leds_dev->num_leds; i++) {
+ rc = qcom_flash_status_get(&leds_dev->leds[i]);
+ if (rc < 0)
+ return rc;
+
+ if (!rc)
+ continue;
+
+ enable |= leds_dev->leds[i].flash_enable_cmd;
+ }
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MASK, enable);
+ if (rc)
+ dev_err(leds_dev->dev, "Enable reg write failed(%d)\n", rc);
+
+ if (enable)
+ return 0;
+
+ rc = regulator_disable(leds_dev->flash_supply);
+ if (rc) {
+ dev_err(leds_dev->dev, "Regulator disable failed(%d)\n", rc);
+ return rc;
+ }
+
+ leds_dev->flash_regulator_on = false;
+
+ return 0;
+}
+
+static int qcom_flash_torch_regulator_on(struct qcom_flash_device *leds_dev)
+{
+ int rc;
+
+ if (leds_dev->torch_regulator_on)
+ return 0;
+
+ rc = regulator_enable(leds_dev->torch_supply);
+ if (rc) {
+ dev_err(leds_dev->dev, "Regulator enable failed(%d)\n", rc);
+ return rc;
+ }
+
+ leds_dev->torch_regulator_on = true;
+
+ return 0;
+}
+
+static int qcom_flash_torch_regulator_off(struct qcom_flash_device *leds_dev)
+{
+ int rc;
+
+ if (!leds_dev->torch_regulator_on)
+ return 0;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MODULE_MASK,
+ QCOM_FLASH_DISABLE_ALL);
+ if (rc)
+ dev_err(leds_dev->dev, "Enable reg write failed(%d)\n", rc);
+
+ rc = regulator_disable(leds_dev->torch_supply);
+ if (rc) {
+ dev_err(leds_dev->dev, "Regulator disable failed(%d)\n", rc);
+ return rc;
+ }
+
+ leds_dev->torch_regulator_on = false;
+
+ return 0;
+}
+
+static int qcom_flash_fled_on(struct qcom_flash_led *led)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct device *dev = leds_dev->dev;
+ int rc, error;
+
+ rc = qcom_flash_fled_regulator_on(leds_dev);
+ if (rc)
+ goto error_flash_set;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ led->flash_enable_cmd,
+ led->flash_enable_cmd);
+ if (rc) {
+ dev_err(dev, "Enable reg write failed(%d)\n", rc);
+ goto error_flash_set;
+ }
+
+ /*
+ * TODO The downstream driver also allowed HW strobe. Add support for it
+ * after v4l2 support is added and ISP can be used
+ */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_STROBE_CTRL,
+ led->flash_strobe_cmd,
+ led->flash_strobe_cmd);
+ if (rc) {
+ dev_err(dev, "LED %d strobe reg write failed(%d)\n", led->id,
+ rc);
+ goto error_flash_set;
+ }
+
+ return 0;
+
+error_flash_set:
+ error = qcom_flash_fled_regulator_off(leds_dev);
+ if (error)
+ return error;
+ return rc;
+}
+
+static int qcom_flash_fled_off(struct qcom_flash_led *led)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct device *dev = leds_dev->dev;
+ int rc, error;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_STROBE_CTRL,
+ led->flash_strobe_cmd,
+ QCOM_FLASH_DISABLE_ALL);
+ if (rc)
+ dev_err(dev, "LED %d flash write failed(%d)\n", led->id, rc);
+
+ error = qcom_flash_fled_regulator_off(leds_dev);
+ if (error)
+ return error;
+ return rc;
+}
+
+static int qcom_flash_torch_on(struct qcom_flash_led *led)
+{
+ int rc, error;
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct device *dev = leds_dev->dev;
+
+ if (leds_dev->peripheral_subtype == QCOM_FLASH_SUBTYPE_DUAL) {
+ rc = qcom_flash_torch_regulator_on(leds_dev);
+ if (rc)
+ goto error_reg_write;
+ } else if (leds_dev->peripheral_subtype == QCOM_FLASH_SUBTYPE_SINGLE) {
+ rc = qcom_flash_fled_regulator_on(leds_dev);
+ if (rc)
+ goto error_flash_set;
+
+ /*
+ * Write 0x80 to MODULE_ENABLE before writing
+ * 0xE0 in order to avoid a hardware bug caused
+ * by register value going from 0x00 to 0xE0.
+ */
+ rc = qcom_flash_masked_write(leds_dev,
+ QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MODULE_MASK,
+ QCOM_FLASH_ENABLE_MODULE);
+ if (rc) {
+ dev_err(dev, "Enable reg write failed(%d)\n", rc);
+ goto error_flash_set;
+ }
+ }
+
+ rc = qcom_flash_torch_reg_enable(leds_dev, true);
+ if (rc)
+ goto error_reg_write;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MASK,
+ leds_dev->torch_enable_cmd);
+ if (rc) {
+ dev_err(dev, "Enable reg write failed(%d)\n", rc);
+ goto error_reg_write;
+ }
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_STROBE_CTRL,
+ led->flash_strobe_cmd,
+ led->flash_strobe_cmd);
+ if (rc) {
+ dev_err(dev, "LED %d strobe reg write failed(%d)\n", led->id,
+ rc);
+ goto error_reg_write;
+ }
+
+ leds_dev->torch_enabled = true;
+
+ return 0;
+
+error_reg_write:
+ if (leds_dev->peripheral_subtype == QCOM_FLASH_SUBTYPE_SINGLE)
+ goto error_flash_set;
+
+ error = qcom_flash_torch_regulator_off(leds_dev);
+ if (error)
+ return error;
+ return rc;
+
+error_flash_set:
+ error = qcom_flash_fled_regulator_off(leds_dev);
+ if (error)
+ return error;
+ return rc;
+}
+
+static int qcom_flash_torch_off(struct qcom_flash_led *led)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct device *dev = leds_dev->dev;
+ int rc, error;
+ unsigned int i;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_STROBE_CTRL,
+ led->flash_strobe_cmd, QCOM_FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(dev, "LED %d flash write failed(%d)\n", led->id, rc);
+ goto error_torch_set;
+ }
+
+ /* Keep torch on if the other LED is still on */
+ for (i = 0; i < leds_dev->num_leds; i++)
+ if (leds_dev->leds[i].fled_cdev.led_cdev.brightness)
+ return 0;
+
+ rc = qcom_flash_torch_reg_enable(leds_dev, false);
+ if (rc)
+ goto error_torch_set;
+
+ if (leds_dev->peripheral_subtype == QCOM_FLASH_SUBTYPE_DUAL) {
+ rc = qcom_flash_torch_regulator_off(leds_dev);
+ if (rc)
+ return rc;
+ } else if (leds_dev->peripheral_subtype == QCOM_FLASH_SUBTYPE_SINGLE) {
+ rc = qcom_flash_fled_regulator_off(leds_dev);
+ if (rc)
+ return rc;
+ }
+
+ leds_dev->torch_enabled = false;
+
+ return 0;
+
+error_torch_set:
+ error = qcom_flash_torch_regulator_off(leds_dev);
+ if (error)
+ return error;
+ return rc;
+}
+
+static int qcom_flash_ledcdev_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+ struct qcom_flash_led *led = flcdev_to_led(fled_cdev);
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ unsigned int max_brightness;
+ int rc;
+
+ if (value > led_cdev->max_brightness) {
+ dev_err(leds_dev->dev, "Invalid brightness value\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&leds_dev->lock);
+ if (!value) {
+ rc = qcom_flash_torch_off(led);
+ } else {
+ /*
+ * The minimum on value for the brightness register is 0, but for
+ * led_classdev is 1, as 0 there means off.
+ */
+ rc = qcom_flash_brightness_set(led, led_cdev->brightness - 1);
+ if (rc)
+ goto unlock;
+
+ led->flash_current_invalidated = true;
+
+ if (leds_dev->torch_enabled) {
+ /* Clear status to update brightness */
+ rc = qcom_flash_status_clear(leds_dev);
+ if (rc)
+ goto unlock;
+ } else {
+ /*
+ * Clear status from previous flash strobe so the LED
+ * can turn on
+ */
+ rc = qcom_flash_check_timedout(leds_dev);
+ if (rc > 0)
+ rc = qcom_flash_status_clear(leds_dev);
+ else if (rc < 0)
+ goto unlock;
+
+ max_brightness = led_cdev->max_brightness - 1;
+ rc = qcom_flash_max_brightness_set(led, max_brightness);
+ if (rc)
+ goto unlock;
+ }
+ rc = qcom_flash_torch_on(led);
+ }
+
+unlock:
+ mutex_unlock(&leds_dev->lock);
+ return rc;
+}
+
+static int qcom_flash_flcdev_brightness_set(struct led_classdev_flash *fled_cdev,
+ u32 brightness)
+{
+ struct qcom_flash_led *led = flcdev_to_led(fled_cdev);
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ unsigned int bright;
+ int rc;
+
+ /* Can't operate on flash if torch is on */
+ if (leds_dev->torch_enabled)
+ return -EBUSY;
+
+ clamp_align(&brightness, QCOM_FLASH_CURRENT_MIN,
+ fled_cdev->brightness.max, QCOM_FLASH_CURRENT_STEP);
+ fled_cdev->brightness.val = brightness;
+
+ bright = qcom_flash_current_to_reg(brightness);
+
+ mutex_lock(&leds_dev->lock);
+ rc = qcom_flash_brightness_set(led, bright);
+ if (rc)
+ goto unlock;
+
+ if (led->flash_current_invalidated) {
+ bright = qcom_flash_current_to_reg(fled_cdev->brightness.max);
+ rc = qcom_flash_max_brightness_set(led, bright);
+ if (rc)
+ goto unlock;
+ }
+
+ led->flash_current_invalidated = false;
+
+unlock:
+ mutex_unlock(&leds_dev->lock);
+ return rc;
+}
+
+static int qcom_flash_flcdev_strobe_set(struct led_classdev_flash *fled_cdev,
+ bool state)
+{
+ struct qcom_flash_led *led = flcdev_to_led(fled_cdev);
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ unsigned int bright;
+ unsigned int i;
+ int rc;
+
+ /* Can't operate on flash if torch is on */
+ if (leds_dev->torch_enabled)
+ return -EBUSY;
+
+ mutex_lock(&leds_dev->lock);
+ if (!state) {
+ rc = qcom_flash_fled_off(led);
+ } else {
+ /*
+ * Turn off flash LEDs from previous strobe
+ */
+ rc = qcom_flash_check_timedout(leds_dev);
+ if (rc > 0) {
+ for (i = 0; i < leds_dev->num_leds; i++) {
+ rc = qcom_flash_fled_off(&leds_dev->leds[i]);
+ if (rc)
+ goto unlock;
+ }
+ } else if (rc < 0) {
+ goto unlock;
+ }
+
+ if (led->flash_current_invalidated) {
+ bright = qcom_flash_current_to_reg(fled_cdev->brightness.val);
+ rc = qcom_flash_brightness_set(led, bright);
+ if (rc)
+ goto unlock;
+
+ bright = qcom_flash_current_to_reg(fled_cdev->brightness.max);
+ rc = qcom_flash_max_brightness_set(led, bright);
+ if (rc)
+ goto unlock;
+
+ led->flash_current_invalidated = false;
+ }
+
+ rc = qcom_flash_fled_on(led);
+ }
+
+unlock:
+ mutex_unlock(&leds_dev->lock);
+ return rc;
+}
+
+static int qcom_flash_flcdev_strobe_get(struct led_classdev_flash *fled_cdev,
+ bool *state)
+{
+ struct qcom_flash_led *led = flcdev_to_led(fled_cdev);
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ int status;
+
+ mutex_lock(&leds_dev->lock);
+ status = qcom_flash_status_get(led);
+ mutex_unlock(&leds_dev->lock);
+ if (status < 0)
+ return status;
+
+ *state = status && !leds_dev->torch_enabled;
+ return 0;
+}
+
+static int qcom_flash_flcdev_timeout_set(struct led_classdev_flash *fled_cdev,
+ u32 timeout)
+{
+ struct qcom_flash_led *led = flcdev_to_led(fled_cdev);
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ unsigned int time, i;
+ int rc;
+
+ clamp_align(&timeout, QCOM_FLASH_DURATION_MIN, fled_cdev->timeout.max,
+ QCOM_FLASH_DURATION_STEP);
+
+ /* Since the timeout register is shared between LEDs, update for all */
+ for (i = 0; i < leds_dev->num_leds; i++)
+ leds_dev->leds[i].fled_cdev.timeout.val = timeout;
+
+ time = qcom_flash_duration_to_reg(fled_cdev->timeout.val);
+
+ mutex_lock(&leds_dev->lock);
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_SAFETY_TIMER,
+ QCOM_FLASH_SAFETY_TIMER_MASK, time);
+ if (rc)
+ dev_err(leds_dev->dev, "Safety timer reg write failed(%d)\n",
+ rc);
+ mutex_unlock(&leds_dev->lock);
+
+ return rc;
+}
+
+static int qcom_flash_flcdev_fault_get(struct led_classdev_flash *fled_cdev,
+ u32 *fault)
+{
+ /*
+ * TODO Add fault detection when we find out how to. No clue from
+ * inspecting the SPMI registers
+ */
+ *fault = 0;
+ return 0;
+}
+
+static const struct led_flash_ops flash_ops = {
+ .flash_brightness_set = qcom_flash_flcdev_brightness_set,
+ .strobe_set = qcom_flash_flcdev_strobe_set,
+ .strobe_get = qcom_flash_flcdev_strobe_get,
+ .timeout_set = qcom_flash_flcdev_timeout_set,
+ .fault_get = qcom_flash_flcdev_fault_get,
+};
+
+static int qcom_flash_setup_flcdev(struct qcom_flash_config *cfg,
+ struct qcom_flash_led *led,
+ struct device_node *node)
+{
+ int rc;
+ struct device *dev = led_to_leds_dev(led)->dev;
+ struct led_classdev_flash *fled_cdev = &led->fled_cdev;
+ struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+ struct led_init_data init_data = {};
+ struct led_flash_setting *setting;
+
+ init_data.fwnode = of_fwnode_handle(node);
+
+ led_cdev->brightness_set_blocking = qcom_flash_ledcdev_brightness_set;
+
+ led_cdev->max_brightness = cfg->led_max_brightness[led->id];
+ led_cdev->max_brightness /= QCOM_FLASH_CURRENT_STEP;
+
+ setting = &fled_cdev->brightness;
+ setting->max = cfg->flash_max_brightness[led->id];
+ setting->min = QCOM_FLASH_CURRENT_MIN;
+ setting->step = QCOM_FLASH_CURRENT_STEP;
+ setting->val = setting->min;
+
+ setting = &fled_cdev->timeout;
+ setting->max = cfg->flash_max_timeout[led->id];
+ setting->min = QCOM_FLASH_DURATION_MIN;
+ setting->step = QCOM_FLASH_DURATION_STEP;
+ setting->val = QCOM_FLASH_DURATION_DEFAULT;
+
+ fled_cdev->ops = &flash_ops;
+ led_cdev->flags |= LED_DEV_CAP_FLASH;
+
+ rc = devm_led_classdev_flash_register_ext(dev, fled_cdev, &init_data);
+ if (rc)
+ dev_err(dev, "unable to register led %d,rc=%d\n", led->id, rc);
+
+ return rc;
+}
+
+static int qcom_flash_setup_fled(struct qcom_flash_config *cfg,
+ struct qcom_flash_led *led,
+ enum qcom_flash_ids id)
+{
+ led->id = cfg->id[id];
+ led->default_on = cfg->default_on[id];
+ led->flash_current_invalidated = true;
+
+ if (led->id == QCOM_FLASH_ID_LED0) {
+ led->flash_enable_cmd = QCOM_FLASH_ENABLE_LED0;
+ led->flash_strobe_cmd = QCOM_FLASH_STROBE_LED0;
+ led->current_addr = QCOM_FLASH_ADDR_CURR_LED0;
+ led->mask_led_on = QCOM_FLASH_MASK_ON_LED0;
+ } else {
+ led->flash_enable_cmd = QCOM_FLASH_ENABLE_LED1;
+ led->flash_strobe_cmd = QCOM_FLASH_STROBE_LED1;
+ led->current_addr = QCOM_FLASH_ADDR_CURR_LED1;
+ led->mask_led_on = QCOM_FLASH_MASK_ON_LED1;
+ }
+
+ return 0;
+}
+
+static int qcom_flash_setup_regs(struct qcom_flash_device *leds_dev)
+{
+ int rc;
+
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_STROBE_CTRL,
+ QCOM_FLASH_STROBE_MASK,
+ QCOM_FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(leds_dev->dev, "LED flash write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Disable flash LED module */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_ENABLE_CONTROL,
+ QCOM_FLASH_ENABLE_MASK,
+ QCOM_FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(leds_dev->dev, "Enable reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set Vreg force */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_VREG_OK_FORCE,
+ QCOM_FLASH_VREG_MASK,
+ QCOM_FLASH_HW_VREG_OK);
+ if (rc) {
+ dev_err(leds_dev->dev, "Vreg OK reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set self fault check */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_FAULT_DETECT,
+ QCOM_FLASH_FAULT_DETECT_MASK,
+ QCOM_FLASH_SELFCHECK_DISABLE);
+ if (rc) {
+ dev_err(leds_dev->dev, "Fault detect reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+
+ /* Set mask enable */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_MASK_ENABLE,
+ QCOM_FLASH_MASK_REG_MASK,
+ QCOM_FLASH_MASK_1);
+ if (rc) {
+ dev_err(leds_dev->dev, "Mask enable reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+
+ /* Set ramp rate */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_RAMP_RATE,
+ QCOM_FLASH_RAMP_RATE_MASK, 0xBF);
+ if (rc) {
+ dev_err(leds_dev->dev, "Ramp rate reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Enable VPH_PWR_DROOP and set threshold to 2.9V */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_VPH_PWR_DROOP,
+ QCOM_FLASH_VPH_PWR_DROOP_MASK, 0xC2);
+ if (rc) {
+ dev_err(leds_dev->dev, "VPH_PWR_DROOP reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+
+ /* Set headroom */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_HEADROOM,
+ QCOM_FLASH_HEADROOM_MASK,
+ QCOM_FLASH_HEADROOM_500MV);
+ if (rc) {
+ dev_err(leds_dev->dev, "Headroom reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set startup delay */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_STARTUP_DELAY,
+ QCOM_FLASH_STARTUP_DLY_MASK,
+ QCOM_FLASH_STARTUP_DLY_10US);
+ if (rc) {
+ dev_err(leds_dev->dev, "Startup delay reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+
+ /*
+ * TODO The downstream driver also supported watchdog mode. Not sure
+ * about the difference, so only support safety timer for now
+ */
+ /* Set timer control */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_LED_TMR_CTRL,
+ QCOM_FLASH_TMR_MASK,
+ QCOM_FLASH_TMR_SAFETY);
+ if (rc) {
+ dev_err(leds_dev->dev, "LED timer ctrl reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+
+ /* Set clamp current */
+ rc = qcom_flash_masked_write(leds_dev, QCOM_FLASH_ADDR_CLAMP_CURR,
+ QCOM_FLASH_CURRENT_MASK,
+ qcom_flash_current_to_reg(QCOM_FLASH_DEFAULT_CLAMP));
+ if (rc)
+ dev_err(leds_dev->dev, "Clamp current reg write failed(%d)\n",
+ rc);
+
+ return rc;
+}
+
+static int qcom_flash_setup_led(struct qcom_flash_config *cfg,
+ struct qcom_flash_led *led,
+ enum qcom_flash_ids id,
+ struct device_node *node)
+{
+ struct qcom_flash_device *leds_dev = led_to_leds_dev(led);
+ struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
+ int rc;
+
+ rc = qcom_flash_setup_fled(cfg, led, id);
+ if (rc)
+ return rc;
+
+ rc = qcom_flash_setup_flcdev(cfg, led, node);
+ if (rc)
+ return rc;
+
+ /* configure default state */
+ if (!led->default_on) {
+ led_cdev->brightness = LED_OFF;
+ } else {
+ led_cdev->brightness = led_cdev->max_brightness;
+ mutex_lock(&leds_dev->lock);
+ rc = qcom_flash_torch_on(led);
+ mutex_unlock(&leds_dev->lock);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static int qcom_flash_setup_leds_device(struct qcom_flash_device *leds_dev,
+ struct qcom_flash_config *cfg,
+ struct device *dev)
+{
+ int rc;
+
+ leds_dev->dev = dev;
+
+ leds_dev->base = cfg->base;
+ leds_dev->num_leds = cfg->num_leds;
+
+ leds_dev->regmap = dev_get_regmap(dev->parent, NULL);
+ if (!leds_dev->regmap) {
+ dev_err(dev, "Failure getting regmap\n");
+ return -ENODEV;
+ }
+
+ rc = qcom_flash_setup_regs(leds_dev);
+ if (rc)
+ return rc;
+
+ rc = qcom_flash_read_reg(leds_dev, QCOM_FLASH_ADDR_PERIPHERAL_SUBTYPE,
+ &leds_dev->peripheral_subtype);
+ if (rc) {
+ dev_err(dev, "Unable to read from addr=%x, rc(%d)\n",
+ QCOM_FLASH_ADDR_PERIPHERAL_SUBTYPE, rc);
+ return rc;
+ }
+
+ leds_dev->flash_supply = cfg->flash_supply;
+
+ if (leds_dev->peripheral_subtype == QCOM_FLASH_SUBTYPE_DUAL) {
+ leds_dev->torch_supply = cfg->torch_supply;
+ leds_dev->torch_enable_cmd = QCOM_FLASH_ENABLE_MODULE;
+ } else {
+ leds_dev->torch_enable_cmd = QCOM_FLASH_ENABLE_ALL;
+ }
+
+ mutex_init(&leds_dev->lock);
+
+ return 0;
+}
+
+static int qcom_flash_parse_dt(struct device *dev,
+ struct qcom_flash_config *cfg,
+ struct device_node *sub_nodes[])
+{
+ struct device_node *node = dev->of_node;
+ struct device_node *child_node;
+ const char *temp_string;
+ int rc, parsed_leds = 0;
+ u32 val;
+
+ rc = of_property_read_u32(node, "reg", &val);
+ if (rc < 0) {
+ dev_err(dev, "Failure reading reg, rc = %d\n", rc);
+ return rc;
+ }
+ cfg->base = val;
+
+ cfg->flash_supply = devm_regulator_get(dev, "flash-boost");
+ cfg->torch_supply = devm_regulator_get(dev, "torch-boost");
+
+ for_each_available_child_of_node(node, child_node) {
+ /* LED properties */
+
+ rc = of_property_read_u32(child_node, "reg",
+ &cfg->id[parsed_leds]);
+ if (rc) {
+ dev_err(dev, "Failure reading led id, rc = %d\n", rc);
+ of_node_put(child_node);
+ return rc;
+ }
+
+ /* Assume LED IDs are ordered in DT for simplicity */
+ if (cfg->id[parsed_leds] != parsed_leds) {
+ dev_err(dev, "Unordered LED nodes in DT\n");
+ of_node_put(child_node);
+ return -EINVAL;
+ }
+
+ sub_nodes[parsed_leds] = child_node;
+
+ rc = of_property_read_string(child_node, "default-state",
+ &temp_string);
+ if (!rc) {
+ if (strncmp(temp_string, "on", sizeof("on")) == 0)
+ cfg->default_on[parsed_leds] = true;
+ } else if (rc != -EINVAL) {
+ dev_err(dev,
+ "Failure reading default-state, rc = %d\n",
+ rc);
+ of_node_put(child_node);
+ return rc;
+ }
+
+ /* FLED properties */
+
+ rc = of_property_read_u32(child_node, "led-max-microamp",
+ &cfg->led_max_brightness[parsed_leds]);
+ if (rc < 0) {
+ dev_err(dev, "Failure reading max_current, rc = %d\n",
+ rc);
+ of_node_put(child_node);
+ return rc;
+ }
+
+ rc = of_property_read_u32(child_node, "flash-max-microamp",
+ &cfg->flash_max_brightness[parsed_leds]);
+ if (rc < 0) {
+ dev_err(dev, "Failure reading max_current, rc = %d\n",
+ rc);
+ of_node_put(child_node);
+ return rc;
+ }
+
+ rc = of_property_read_u32(child_node, "flash-max-timeout-us",
+ &cfg->flash_max_timeout[parsed_leds]);
+ if (rc < 0) {
+ dev_err(dev, "Failure reading max_timeout, rc = %d\n",
+ rc);
+ of_node_put(child_node);
+ return rc;
+ }
+
+ parsed_leds++;
+ if (parsed_leds >= 2) {
+ of_node_put(child_node);
+ break;
+ }
+ }
+ cfg->num_leds = parsed_leds;
+
+ return 0;
+}
+
+static int qcom_flash_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct qcom_flash_device *leds_dev;
+ struct qcom_flash_config cfg = { 0 };
+ struct device_node *sub_nodes[2];
+ unsigned int i;
+ int rc;
+
+ leds_dev = devm_kzalloc(dev, sizeof(*leds_dev), GFP_KERNEL);
+ if (!leds_dev)
+ return -ENOMEM;
+
+ rc = qcom_flash_parse_dt(dev, &cfg, sub_nodes);
+ if (rc)
+ return rc;
+
+ rc = qcom_flash_setup_leds_device(leds_dev, &cfg, dev);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < leds_dev->num_leds; i++) {
+ rc = qcom_flash_setup_led(&cfg, &leds_dev->leds[i], i,
+ sub_nodes[i]);
+ if (rc)
+ return rc;
+ }
+
+ platform_set_drvdata(pdev, leds_dev);
+
+ return 0;
+}
+
+static int qcom_flash_remove(struct platform_device *pdev)
+{
+ struct qcom_flash_device *leds_dev = platform_get_drvdata(pdev);
+
+ mutex_destroy(&leds_dev->lock);
+
+ return 0;
+}
+
+static const struct of_device_id qcom_flash_spmi_of_match[] = {
+ { .compatible = "qcom,spmi-flash-leds" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, qcom_flash_spmi_of_match);
+
+static struct platform_driver qcom_flash_driver = {
+ .driver = {
+ .name = "qcom,spmi-flash-leds",
+ .of_match_table = qcom_flash_spmi_of_match,
+ },
+ .probe = qcom_flash_probe,
+ .remove = qcom_flash_remove,
+};
+module_platform_driver(qcom_flash_driver);
+
+MODULE_DESCRIPTION("Qualcomm SPMI Flash LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Nícolas F. R. A. Prado <n@nfraprado.net>");