[RFC PATCH 1/3] leds: Add driver for QPNP flash led

From: Nícolas F. R. A. Prado
Date: Fri Nov 06 2020 - 11:58:51 EST

Add driver for the QPNP flash LED. It works over SPMI and is part of the
PM8941 PMIC.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxxx>
---
drivers/leds/Kconfig | 9 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-qpnp.c | 1351 ++++++++++++++++++++++++++++++++++++++
3 files changed, 1361 insertions(+)
create mode 100644 drivers/leds/leds-qpnp.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 849d3c5f908e..ca5f6e81c064 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -928,6 +928,15 @@ config LEDS_ACER_A500
This option enables support for the Power Button LED of
Acer Iconia Tab A500.

+config LEDS_QPNP
+ tristate "Support for QPNP LEDs"
+ depends on SPMI
+ help
+ This driver supports the flash/torch led of Qualcomm PNP PMIC.
+
+ To compile this driver as a module, choose M here: the module will
+ be called leds-qpnp.
+
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"

diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 73e603e1727e..055360240801 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o
obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
+obj-$(CONFIG_LEDS_QPNP) += leds-qpnp.o

# LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
diff --git a/drivers/leds/leds-qpnp.c b/drivers/leds/leds-qpnp.c
new file mode 100644
index 000000000000..9970688264aa
--- /dev/null
+++ b/drivers/leds/leds-qpnp.c
@@ -0,0 +1,1351 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spmi.h>
+#include <linux/of_device.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/regulator/consumer.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+
+#define FLASH_SAFETY_TIMER 0x40
+#define FLASH_MAX_CURR 0x41
+#define FLASH_LED_0_CURR 0x42
+#define FLASH_LED_1_CURR 0x43
+#define FLASH_CLAMP_CURR 0x44
+#define FLASH_LED_TMR_CTRL 0x48
+#define FLASH_HEADROOM 0x4A
+#define FLASH_STARTUP_DELAY 0x4B
+#define FLASH_MASK_ENABLE 0x4C
+#define FLASH_VREG_OK_FORCE 0x4F
+#define FLASH_ENABLE_CONTROL 0x46
+#define FLASH_LED_STROBE_CTRL 0x47
+#define FLASH_LED_UNLOCK_SECURE 0xD0
+#define FLASH_LED_TORCH 0xE4
+#define FLASH_FAULT_DETECT 0x51
+#define FLASH_RAMP_RATE 0x54
+#define FLASH_PERIPHERAL_SUBTYPE 0x05
+#define FLASH_VPH_PWR_DROOP 0x5A
+
+#define FLASH_MAX_LEVEL 0x4F
+#define TORCH_MAX_LEVEL 0x0F
+#define FLASH_NO_MASK 0x00
+
+#define FLASH_MASK_1 0x20
+#define FLASH_MASK_REG_MASK 0xE0
+#define FLASH_HEADROOM_MASK 0x03
+#define FLASH_SAFETY_TIMER_MASK 0x7F
+#define FLASH_CURRENT_MASK 0xFF
+#define FLASH_MAX_CURRENT_MASK 0x7F
+#define FLASH_TMR_MASK 0x03
+#define FLASH_TMR_WATCHDOG 0x03
+#define FLASH_TMR_SAFETY 0x00
+#define FLASH_FAULT_DETECT_MASK 0X80
+#define FLASH_HW_VREG_OK 0x40
+#define FLASH_VREG_MASK 0xC0
+#define FLASH_STARTUP_DLY_MASK 0x02
+#define FLASH_RAMP_RATE_MASK 0xBF
+#define FLASH_VPH_PWR_DROOP_MASK 0xF3
+
+#define FLASH_ENABLE_ALL 0xE0
+#define FLASH_ENABLE_MODULE 0x80
+#define FLASH_ENABLE_MODULE_MASK 0x80
+#define FLASH_DISABLE_ALL 0x00
+#define FLASH_ENABLE_MASK 0xE0
+#define FLASH_ENABLE_LED_0 0xC0
+#define FLASH_ENABLE_LED_1 0xA0
+#define FLASH_INIT_MASK 0xE0
+#define FLASH_SELFCHECK_ENABLE 0x80
+#define FLASH_SELFCHECK_DISABLE 0x00
+
+#define FLASH_STROBE_SW 0xC0
+#define FLASH_STROBE_HW 0x04
+#define FLASH_STROBE_MASK 0xC7
+#define FLASH_LED_0_OUTPUT 0x80
+#define FLASH_LED_1_OUTPUT 0x40
+
+#define FLASH_CURRENT_PRGM_MIN 1
+#define FLASH_CURRENT_PRGM_SHIFT 1
+#define FLASH_CURRENT_MAX 0x4F
+#define FLASH_CURRENT_TORCH 0x07
+
+#define FLASH_DURATION_200ms 0x13
+#define FLASH_CLAMP_200mA 0x0F
+
+#define FLASH_TORCH_MASK 0x03
+#define FLASH_LED_TORCH_ENABLE 0x00
+#define FLASH_LED_TORCH_DISABLE 0x03
+#define FLASH_UNLOCK_SECURE 0xA5
+#define FLASH_SECURE_MASK 0xFF
+
+#define FLASH_SUBTYPE_DUAL 0x01
+#define FLASH_SUBTYPE_SINGLE 0x02
+
+#define LED_TRIGGER_DEFAULT "none"
+
+/**
+ * enum qpnp_leds - QPNP supported led ids
+ * @QPNP_ID_WLED - White led backlight
+ */
+enum qpnp_leds {
+ QPNP_ID_FLASH1_LED0 = 1,
+ QPNP_ID_FLASH1_LED1,
+ QPNP_ID_MAX,
+};
+
+enum flash_headroom {
+ HEADROOM_250mV = 0,
+ HEADROOM_300mV,
+ HEADROOM_400mV,
+ HEADROOM_500mV,
+};
+
+enum flash_startup_dly {
+ DELAY_10us = 0,
+ DELAY_32us,
+ DELAY_64us,
+ DELAY_128us,
+};
+
+static u8 flash_debug_regs[] = {
+ 0x40, 0x41, 0x42, 0x43, 0x44, 0x48, 0x49, 0x4b, 0x4c,
+ 0x4f, 0x46, 0x47,
+};
+
+/**
+ * flash_config_data - flash configuration data
+ * @current_prgm - current to be programmed, scaled by max level
+ * @clamp_curr - clamp current to use
+ * @headroom - headroom value to use
+ * @duration - duration of the flash
+ * @enable_module - enable address for particular flash
+ * @trigger_flash - trigger flash
+ * @startup_dly - startup delay for flash
+ * @strobe_type - select between sw and hw strobe
+ * @peripheral_subtype - module peripheral subtype
+ * @current_addr - address to write for current
+ * @second_addr - address of secondary flash to be written
+ * @safety_timer - enable safety timer or watchdog timer
+ * @torch_enable - enable flash LED torch mode
+ * @flash_reg_get - flash regulator attached or not
+ * @flash_on - flash status, on or off
+ * @torch_on - torch status, on or off
+ * @flash_boost_reg - boost regulator for flash
+ * @torch_boost_reg - boost regulator for torch
+ */
+struct flash_config_data {
+ u8 current_prgm;
+ u8 clamp_curr;
+ u8 headroom;
+ u8 duration;
+ u8 enable_module;
+ u8 trigger_flash;
+ u8 startup_dly;
+ u8 strobe_type;
+ u8 peripheral_subtype;
+ u16 current_addr;
+ u16 second_addr;
+ bool safety_timer;
+ bool torch_enable;
+ bool flash_reg_get;
+ bool flash_on;
+ bool torch_on;
+ struct regulator *flash_boost_reg;
+ struct regulator *torch_boost_reg;
+};
+
+/**
+ * struct qpnp_led_data - internal led data structure
+ * @led_classdev - led class device
+ * @delayed_work - delayed work for turning off the LED
+ * @work - workqueue for led
+ * @id - led index
+ * @base_reg - base register given in device tree
+ * @lock - to protect the transactions
+ * @reg - cached value of led register
+ * @num_leds - number of leds in the module
+ * @max_current - maximum current supported by LED
+ * @default_on - true: default state max, false, default state 0
+ * @turn_off_delay_ms - number of msec before turning off the LED
+ */
+struct qpnp_led_data {
+ struct led_classdev cdev;
+ struct regmap *regmap;
+ struct device *dev;
+ struct delayed_work dwork;
+ struct work_struct work;
+ int id;
+ u16 base;
+ u8 reg;
+ u8 num_leds;
+ struct mutex lock;
+ struct flash_config_data *flash_cfg;
+ int max_current;
+ bool default_on;
+ int turn_off_delay_ms;
+};
+
+static int led_read_reg(struct qpnp_led_data *led, u16 offset, u8 *data)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(led->regmap, led->base + offset, &val);
+ if (ret < 0)
+ return ret;
+
+ *data = val;
+ return 0;
+}
+
+static int led_write_reg(struct qpnp_led_data *led, u16 offset, u8 data)
+{
+ return regmap_write(led->regmap, led->base + offset, data);
+}
+
+static void qpnp_dump_regs(struct qpnp_led_data *led, u8 regs[], u8 array_size)
+{
+ int i;
+ u8 val;
+
+ pr_debug("===== %s LED register dump start =====\n", led->cdev.name);
+ for (i = 0; i < array_size; i++) {
+ led_read_reg(led, regs[i], &val);
+ pr_debug("%s: 0x%x = 0x%x\n", led->cdev.name,
+ led->base + regs[i], val);
+ }
+ pr_debug("===== %s LED register dump end =====\n", led->cdev.name);
+}
+
+
+static int qpnp_get_common_configs(struct qpnp_led_data *led,
+ struct device_node *node)
+{
+ int rc;
+ u32 val;
+ const char *temp_string;
+
+ led->cdev.default_trigger = LED_TRIGGER_DEFAULT;
+ rc = of_property_read_string(node, "linux,default-trigger",
+ &temp_string);
+ if (!rc)
+ led->cdev.default_trigger = temp_string;
+ else if (rc != -EINVAL)
+ return rc;
+
+ led->default_on = false;
+ rc = of_property_read_string(node, "qcom,default-state",
+ &temp_string);
+ if (!rc) {
+ if (strncmp(temp_string, "on", sizeof("on")) == 0)
+ led->default_on = true;
+ } else if (rc != -EINVAL)
+ return rc;
+
+ led->turn_off_delay_ms = 0;
+ rc = of_property_read_u32(node, "qcom,turn-off-delay-ms", &val);
+ if (!rc)
+ led->turn_off_delay_ms = val;
+ else if (rc != -EINVAL)
+ return rc;
+
+ return 0;
+}
+
+static void qpnp_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct qpnp_led_data *led;
+
+ led = container_of(led_cdev, struct qpnp_led_data, cdev);
+ if (value < LED_OFF || value > led->cdev.max_brightness) {
+ dev_err(led->dev, "Invalid brightness value\n");
+ return;
+ }
+
+ led->cdev.brightness = value;
+ schedule_work(&led->work);
+}
+
+static enum led_brightness qpnp_led_get(struct led_classdev *led_cdev)
+{
+ struct qpnp_led_data *led;
+
+ led = container_of(led_cdev, struct qpnp_led_data, cdev);
+
+ return led->cdev.brightness;
+}
+
+static int qpnp_get_config_flash(struct qpnp_led_data *led,
+ struct device_node *node, bool *reg_set)
+{
+ int rc;
+ u32 val;
+
+ led->flash_cfg = devm_kzalloc(led->dev,
+ sizeof(struct flash_config_data), GFP_KERNEL);
+ if (!led->flash_cfg) {
+ dev_err(led->dev, "Unable to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ rc = led_read_reg(led, FLASH_PERIPHERAL_SUBTYPE,
+ &led->flash_cfg->peripheral_subtype);
+ if (rc) {
+ dev_err(led->dev,
+ "Unable to read from addr=%x, rc(%d)\n",
+ FLASH_PERIPHERAL_SUBTYPE, rc);
+ }
+
+ led->flash_cfg->torch_enable =
+ of_property_read_bool(node, "qcom,torch-enable");
+
+ if (led->id == QPNP_ID_FLASH1_LED0) {
+ led->flash_cfg->enable_module = FLASH_ENABLE_LED_0;
+ led->flash_cfg->current_addr = FLASH_LED_0_CURR;
+ led->flash_cfg->trigger_flash = FLASH_LED_0_OUTPUT;
+ if (!*reg_set) {
+ led->flash_cfg->flash_boost_reg =
+ regulator_get(led->dev,
+ "flash-boost");
+ if (IS_ERR(led->flash_cfg->flash_boost_reg)) {
+ rc = PTR_ERR(led->flash_cfg->flash_boost_reg);
+ dev_err(led->dev,
+ "Regulator get failed(%d)\n", rc);
+ goto error_get_flash_reg;
+ }
+ led->flash_cfg->flash_reg_get = true;
+ *reg_set = true;
+ } else
+ led->flash_cfg->flash_reg_get = false;
+
+ if (led->flash_cfg->torch_enable) {
+ led->flash_cfg->second_addr =
+ FLASH_LED_1_CURR;
+ }
+ } else if (led->id == QPNP_ID_FLASH1_LED1) {
+ led->flash_cfg->enable_module = FLASH_ENABLE_LED_1;
+ led->flash_cfg->current_addr = FLASH_LED_1_CURR;
+ led->flash_cfg->trigger_flash = FLASH_LED_1_OUTPUT;
+ if (!*reg_set) {
+ led->flash_cfg->flash_boost_reg =
+ regulator_get(led->dev,
+ "flash-boost");
+ if (IS_ERR(led->flash_cfg->flash_boost_reg)) {
+ rc = PTR_ERR(led->flash_cfg->flash_boost_reg);
+ dev_err(led->dev,
+ "Regulator get failed(%d)\n", rc);
+ goto error_get_flash_reg;
+ }
+ led->flash_cfg->flash_reg_get = true;
+ *reg_set = true;
+ } else
+ led->flash_cfg->flash_reg_get = false;
+
+ if (led->flash_cfg->torch_enable) {
+ led->flash_cfg->second_addr =
+ FLASH_LED_0_CURR;
+ }
+ } else {
+ dev_err(led->dev, "Unknown flash LED name given\n");
+ return -EINVAL;
+ }
+
+ if (led->flash_cfg->torch_enable) {
+ if (of_find_property(of_get_parent(node), "torch-boost-supply",
+ NULL)) {
+ led->flash_cfg->torch_boost_reg =
+ regulator_get(led->dev,
+ "torch-boost");
+ if (IS_ERR(led->flash_cfg->torch_boost_reg)) {
+ rc = PTR_ERR(led->flash_cfg->torch_boost_reg);
+ dev_err(led->dev,
+ "Torch regulator get failed(%d)\n", rc);
+ goto error_get_torch_reg;
+ }
+ led->flash_cfg->enable_module = FLASH_ENABLE_MODULE;
+ } else
+ led->flash_cfg->enable_module = FLASH_ENABLE_ALL;
+ led->flash_cfg->trigger_flash = FLASH_STROBE_SW;
+ }
+
+ rc = of_property_read_u32(node, "qcom,current", &val);
+ if (!rc) {
+ if (led->flash_cfg->torch_enable) {
+ led->flash_cfg->current_prgm = (val *
+ TORCH_MAX_LEVEL / led->max_current);
+ return 0;
+ }
+ else
+ led->flash_cfg->current_prgm = (val *
+ FLASH_MAX_LEVEL / led->max_current);
+ } else
+ if (led->flash_cfg->torch_enable)
+ goto error_get_torch_reg;
+ else
+ goto error_get_flash_reg;
+
+ rc = of_property_read_u32(node, "qcom,headroom", &val);
+ if (!rc)
+ led->flash_cfg->headroom = (u8) val;
+ else if (rc == -EINVAL)
+ led->flash_cfg->headroom = HEADROOM_500mV;
+ else
+ goto error_get_flash_reg;
+
+ rc = of_property_read_u32(node, "qcom,duration", &val);
+ if (!rc)
+ led->flash_cfg->duration = (((u8) val) - 10) / 10;
+ else if (rc == -EINVAL)
+ led->flash_cfg->duration = FLASH_DURATION_200ms;
+ else
+ goto error_get_flash_reg;
+
+ rc = of_property_read_u32(node, "qcom,clamp-curr", &val);
+ if (!rc)
+ led->flash_cfg->clamp_curr = (val *
+ FLASH_MAX_LEVEL / led->max_current);
+ else if (rc == -EINVAL)
+ led->flash_cfg->clamp_curr = FLASH_CLAMP_200mA;
+ else
+ goto error_get_flash_reg;
+
+ rc = of_property_read_u32(node, "qcom,startup-dly", &val);
+ if (!rc)
+ led->flash_cfg->startup_dly = (u8) val;
+ else if (rc == -EINVAL)
+ led->flash_cfg->startup_dly = DELAY_128us;
+ else
+ goto error_get_flash_reg;
+
+ led->flash_cfg->safety_timer =
+ of_property_read_bool(node, "qcom,safety-timer");
+
+ return 0;
+
+error_get_torch_reg:
+ regulator_put(led->flash_cfg->torch_boost_reg);
+
+error_get_flash_reg:
+ regulator_put(led->flash_cfg->flash_boost_reg);
+ return rc;
+
+}
+
+static ssize_t led_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct qpnp_led_data *led;
+ unsigned long state;
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ ssize_t ret = -EINVAL;
+
+ ret = kstrtoul(buf, 10, &state);
+ if (ret)
+ return ret;
+
+ led = container_of(led_cdev, struct qpnp_led_data, cdev);
+
+ /* '1' to enable torch mode; '0' to switch to flash mode */
+ if (state == 1)
+ led->flash_cfg->torch_enable = true;
+ else
+ led->flash_cfg->torch_enable = false;
+
+ return count;
+}
+
+static ssize_t led_strobe_type_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct qpnp_led_data *led;
+ unsigned long state;
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ ssize_t ret = -EINVAL;
+
+ ret = kstrtoul(buf, 10, &state);
+ if (ret)
+ return ret;
+
+ led = container_of(led_cdev, struct qpnp_led_data, cdev);
+
+ /* '0' for sw strobe; '1' for hw strobe */
+ if (state == 1)
+ led->flash_cfg->strobe_type = 1;
+ else
+ led->flash_cfg->strobe_type = 0;
+
+ return count;
+}
+
+static DEVICE_ATTR(led_mode, 0664, NULL, led_mode_store);
+static DEVICE_ATTR(strobe, 0664, NULL, led_strobe_type_store);
+
+static struct attribute *led_attrs[] = {
+ &dev_attr_led_mode.attr,
+ &dev_attr_strobe.attr,
+ NULL
+};
+
+static const struct attribute_group led_attr_group = {
+ .attrs = led_attrs,
+};
+
+static int qpnp_led_set_max_brightness(struct qpnp_led_data *led)
+{
+ switch (led->id) {
+ case QPNP_ID_FLASH1_LED0:
+ case QPNP_ID_FLASH1_LED1:
+ led->cdev.max_brightness = led->max_current;
+ break;
+ default:
+ dev_err(led->dev, "Invalid LED(%d)\n", led->id);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int
+qpnp_led_masked_write(struct qpnp_led_data *led, u16 addr, u8 mask, u8 val)
+{
+ int rc;
+ u8 reg;
+
+ rc = led_read_reg(led, addr, &reg);
+ if (rc) {
+ dev_err(led->dev,
+ "Unable to read from addr=%x, rc(%d)\n", addr, rc);
+ }
+
+ reg &= ~mask;
+ reg |= val;
+
+ rc = led_write_reg(led, addr, reg);
+ if (rc)
+ dev_err(led->dev,
+ "Unable to write to addr=%x, rc(%d)\n", addr, rc);
+ return rc;
+}
+
+static int qpnp_flash_init(struct qpnp_led_data *led)
+{
+ int rc;
+
+ led->flash_cfg->flash_on = false;
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_STROBE_CTRL,
+ FLASH_STROBE_MASK, FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(led->dev,
+ "LED %d flash write failed(%d)\n", led->id, rc);
+ return rc;
+ }
+
+ /* Disable flash LED module */
+ rc = qpnp_led_masked_write(led, FLASH_ENABLE_CONTROL,
+ FLASH_ENABLE_MODULE_MASK, FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ if (led->flash_cfg->torch_enable)
+ return 0;
+
+ /* Set headroom */
+ rc = qpnp_led_masked_write(led, FLASH_HEADROOM,
+ FLASH_HEADROOM_MASK, led->flash_cfg->headroom);
+ if (rc) {
+ dev_err(led->dev,
+ "Headroom reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set startup delay */
+ rc = qpnp_led_masked_write(led,
+ FLASH_STARTUP_DELAY, FLASH_STARTUP_DLY_MASK,
+ led->flash_cfg->startup_dly);
+ if (rc) {
+ dev_err(led->dev,
+ "Startup delay reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set timer control - safety or watchdog */
+ if (led->flash_cfg->safety_timer) {
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_TMR_CTRL,
+ FLASH_TMR_MASK, FLASH_TMR_SAFETY);
+ if (rc) {
+ dev_err(led->dev,
+ "LED timer ctrl reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+ }
+
+ /* Set Vreg force */
+ rc = qpnp_led_masked_write(led, FLASH_VREG_OK_FORCE,
+ FLASH_VREG_MASK, FLASH_HW_VREG_OK);
+ if (rc) {
+ dev_err(led->dev,
+ "Vreg OK reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set self fault check */
+ rc = qpnp_led_masked_write(led, FLASH_FAULT_DETECT,
+ FLASH_FAULT_DETECT_MASK, FLASH_SELFCHECK_DISABLE);
+ if (rc) {
+ dev_err(led->dev,
+ "Fault detect reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set mask enable */
+ rc = qpnp_led_masked_write(led, FLASH_MASK_ENABLE,
+ FLASH_MASK_REG_MASK, FLASH_MASK_1);
+ if (rc) {
+ dev_err(led->dev,
+ "Mask enable reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Set ramp rate */
+ rc = qpnp_led_masked_write(led, FLASH_RAMP_RATE,
+ FLASH_RAMP_RATE_MASK, 0xBF);
+ if (rc) {
+ dev_err(led->dev,
+ "Ramp rate reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ /* Enable VPH_PWR_DROOP and set threshold to 2.9V */
+ rc = qpnp_led_masked_write(led, FLASH_VPH_PWR_DROOP,
+ FLASH_VPH_PWR_DROOP_MASK, 0xC2);
+ if (rc) {
+ dev_err(led->dev,
+ "FLASH_VPH_PWR_DROOP reg write failed(%d)\n", rc);
+ return rc;
+ }
+
+ led->flash_cfg->strobe_type = 0;
+
+ /* dump flash registers */
+ qpnp_dump_regs(led, flash_debug_regs, ARRAY_SIZE(flash_debug_regs));
+
+ return 0;
+}
+
+static int qpnp_led_initialize(struct qpnp_led_data *led)
+{
+ int rc = 0;
+
+ switch (led->id) {
+ case QPNP_ID_FLASH1_LED0:
+ case QPNP_ID_FLASH1_LED1:
+ rc = qpnp_flash_init(led);
+ if (rc)
+ dev_err(led->dev,
+ "FLASH initialize failed(%d)\n", rc);
+ break;
+ default:
+ dev_err(led->dev, "Invalid LED(%d)\n", led->id);
+ return -EINVAL;
+ }
+
+ return rc;
+}
+
+static int qpnp_flash_regulator_operate(struct qpnp_led_data *led, bool on)
+{
+ int rc, i;
+ struct qpnp_led_data *led_array;
+ bool regulator_on = false;
+
+ led_array = dev_get_drvdata(led->dev);
+ if (!led_array) {
+ dev_err(led->dev,
+ "Unable to get LED array\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < led->num_leds; i++)
+ regulator_on |= led_array[i].flash_cfg->flash_on;
+
+ if (!on)
+ goto regulator_turn_off;
+
+ if (!regulator_on && !led->flash_cfg->flash_on) {
+ for (i = 0; i < led->num_leds; i++) {
+ if (led_array[i].flash_cfg->flash_reg_get) {
+ rc = regulator_enable(
+ led_array[i].flash_cfg->\
+ flash_boost_reg);
+ if (rc) {
+ dev_err(led->dev,
+ "Regulator enable failed(%d)\n",
+ rc);
+ return rc;
+ }
+ led->flash_cfg->flash_on = true;
+ }
+ break;
+ }
+ }
+
+ return 0;
+
+regulator_turn_off:
+ if (regulator_on && led->flash_cfg->flash_on) {
+ for (i = 0; i < led->num_leds; i++) {
+ if (led_array[i].flash_cfg->flash_reg_get) {
+ rc = qpnp_led_masked_write(led,
+ FLASH_ENABLE_CONTROL,
+ FLASH_ENABLE_MASK,
+ FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n",
+ rc);
+ }
+
+ rc = regulator_disable(led_array[i].flash_cfg->\
+ flash_boost_reg);
+ if (rc) {
+ dev_err(led->dev,
+ "Regulator disable failed(%d)\n",
+ rc);
+ return rc;
+ }
+ led->flash_cfg->flash_on = false;
+ }
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int qpnp_torch_regulator_operate(struct qpnp_led_data *led, bool on)
+{
+ int rc;
+
+ if (!on)
+ goto regulator_turn_off;
+
+ if (!led->flash_cfg->torch_on) {
+ rc = regulator_enable(led->flash_cfg->torch_boost_reg);
+ if (rc) {
+ dev_err(led->dev,
+ "Regulator enable failed(%d)\n", rc);
+ return rc;
+ }
+ led->flash_cfg->torch_on = true;
+ }
+ return 0;
+
+regulator_turn_off:
+ if (led->flash_cfg->torch_on) {
+ rc = qpnp_led_masked_write(led, FLASH_ENABLE_CONTROL,
+ FLASH_ENABLE_MODULE_MASK, FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n", rc);
+ }
+
+ rc = regulator_disable(led->flash_cfg->torch_boost_reg);
+ if (rc) {
+ dev_err(led->dev,
+ "Regulator disable failed(%d)\n", rc);
+ return rc;
+ }
+ led->flash_cfg->torch_on = false;
+ }
+ return 0;
+}
+
+static int qpnp_flash_set(struct qpnp_led_data *led)
+{
+ int rc, error;
+ int val = led->cdev.brightness;
+
+ if (led->flash_cfg->torch_enable)
+ led->flash_cfg->current_prgm =
+ (val * TORCH_MAX_LEVEL / led->max_current);
+ else
+ led->flash_cfg->current_prgm =
+ (val * FLASH_MAX_LEVEL / led->max_current);
+
+ /* Set led current */
+ if (val > 0) {
+ if (led->flash_cfg->torch_enable) {
+ if (led->flash_cfg->peripheral_subtype ==
+ FLASH_SUBTYPE_DUAL) {
+ rc = qpnp_torch_regulator_operate(led, true);
+ if (rc) {
+ dev_err(led->dev,
+ "Torch regulator operate failed(%d)\n",
+ rc);
+ return rc;
+ }
+ } else if (led->flash_cfg->peripheral_subtype ==
+ FLASH_SUBTYPE_SINGLE) {
+ rc = qpnp_flash_regulator_operate(led, true);
+ if (rc) {
+ dev_err(led->dev,
+ "Flash regulator operate failed(%d)\n",
+ 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 = qpnp_led_masked_write(led,
+ FLASH_ENABLE_CONTROL,
+ FLASH_ENABLE_MODULE_MASK,
+ FLASH_ENABLE_MODULE);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n",
+ rc);
+ return rc;
+ }
+ }
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_UNLOCK_SECURE,
+ FLASH_SECURE_MASK, FLASH_UNLOCK_SECURE);
+ if (rc) {
+ dev_err(led->dev,
+ "Secure reg write failed(%d)\n", rc);
+ goto error_reg_write;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_TORCH,
+ FLASH_TORCH_MASK, FLASH_LED_TORCH_ENABLE);
+ if (rc) {
+ dev_err(led->dev,
+ "Torch reg write failed(%d)\n", rc);
+ goto error_reg_write;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ led->flash_cfg->current_addr,
+ FLASH_CURRENT_MASK,
+ led->flash_cfg->current_prgm);
+ if (rc) {
+ dev_err(led->dev,
+ "Current reg write failed(%d)\n", rc);
+ goto error_reg_write;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ led->flash_cfg->second_addr,
+ FLASH_CURRENT_MASK,
+ led->flash_cfg->current_prgm);
+ if (rc) {
+ dev_err(led->dev,
+ "2nd Current reg write failed(%d)\n",
+ rc);
+ goto error_reg_write;
+ }
+
+ qpnp_led_masked_write(led, FLASH_MAX_CURR,
+ FLASH_CURRENT_MASK,
+ TORCH_MAX_LEVEL);
+ if (rc) {
+ dev_err(led->dev,
+ "Max current reg write failed(%d)\n",
+ rc);
+ goto error_reg_write;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_ENABLE_CONTROL,
+ FLASH_ENABLE_MASK,
+ led->flash_cfg->enable_module);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n",
+ rc);
+ goto error_reg_write;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_STROBE_CTRL,
+ led->flash_cfg->trigger_flash,
+ led->flash_cfg->trigger_flash);
+ if (rc) {
+ dev_err(led->dev,
+ "LED %d strobe reg write failed(%d)\n",
+ led->id, rc);
+ goto error_reg_write;
+ }
+ } else {
+ rc = qpnp_flash_regulator_operate(led, true);
+ if (rc) {
+ dev_err(led->dev,
+ "Flash regulator operate failed(%d)\n",
+ rc);
+ goto error_flash_set;
+ }
+
+ /* Set flash safety timer */
+ rc = qpnp_led_masked_write(led,
+ FLASH_SAFETY_TIMER,
+ FLASH_SAFETY_TIMER_MASK,
+ led->flash_cfg->duration);
+ if (rc) {
+ dev_err(led->dev,
+ "Safety timer reg write failed(%d)\n",
+ rc);
+ goto error_flash_set;
+ }
+
+ /* Set max current */
+ rc = qpnp_led_masked_write(led,
+ FLASH_MAX_CURR, FLASH_CURRENT_MASK,
+ FLASH_MAX_LEVEL);
+ if (rc) {
+ dev_err(led->dev,
+ "Max current reg write failed(%d)\n",
+ rc);
+ goto error_flash_set;
+ }
+
+ /* Set clamp current */
+ rc = qpnp_led_masked_write(led,
+ FLASH_CLAMP_CURR,
+ FLASH_CURRENT_MASK,
+ led->flash_cfg->clamp_curr);
+ if (rc) {
+ dev_err(led->dev,
+ "Clamp current reg write failed(%d)\n",
+ rc);
+ goto error_flash_set;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ led->flash_cfg->current_addr,
+ FLASH_CURRENT_MASK,
+ led->flash_cfg->current_prgm);
+ if (rc) {
+ dev_err(led->dev,
+ "Current reg write failed(%d)\n", rc);
+ goto error_flash_set;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_ENABLE_CONTROL,
+ led->flash_cfg->enable_module,
+ led->flash_cfg->enable_module);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n", rc);
+ goto error_flash_set;
+ }
+
+ /* TODO try to not busy wait*/
+ mdelay(1);
+
+ if (!led->flash_cfg->strobe_type) {
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_STROBE_CTRL,
+ led->flash_cfg->trigger_flash,
+ led->flash_cfg->trigger_flash);
+ if (rc) {
+ dev_err(led->dev,
+ "LED %d strobe reg write failed(%d)\n",
+ led->id, rc);
+ goto error_flash_set;
+ }
+ } else {
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_STROBE_CTRL,
+ (led->flash_cfg->trigger_flash |
+ FLASH_STROBE_HW),
+ (led->flash_cfg->trigger_flash |
+ FLASH_STROBE_HW));
+ if (rc) {
+ dev_err(led->dev,
+ "LED %d strobe reg write failed(%d)\n",
+ led->id, rc);
+ goto error_flash_set;
+ }
+ }
+ }
+ } else {
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_STROBE_CTRL,
+ led->flash_cfg->trigger_flash,
+ FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(led->dev,
+ "LED %d flash write failed(%d)\n", led->id, rc);
+ if (led->flash_cfg->torch_enable)
+ goto error_torch_set;
+ else
+ goto error_flash_set;
+ }
+
+ /* TODO try to not busy wait*/
+ mdelay(2);
+ udelay(160);
+
+ if (led->flash_cfg->torch_enable) {
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_UNLOCK_SECURE,
+ FLASH_SECURE_MASK, FLASH_UNLOCK_SECURE);
+ if (rc) {
+ dev_err(led->dev,
+ "Secure reg write failed(%d)\n", rc);
+ goto error_torch_set;
+ }
+
+ rc = qpnp_led_masked_write(led,
+ FLASH_LED_TORCH,
+ FLASH_TORCH_MASK,
+ FLASH_LED_TORCH_DISABLE);
+ if (rc) {
+ dev_err(led->dev,
+ "Torch reg write failed(%d)\n", rc);
+ goto error_torch_set;
+ }
+
+ if (led->flash_cfg->peripheral_subtype ==
+ FLASH_SUBTYPE_DUAL) {
+ rc = qpnp_torch_regulator_operate(led, false);
+ if (rc) {
+ dev_err(led->dev,
+ "Torch regulator operate failed(%d)\n",
+ rc);
+ return rc;
+ }
+ } else if (led->flash_cfg->peripheral_subtype ==
+ FLASH_SUBTYPE_SINGLE) {
+ rc = qpnp_flash_regulator_operate(led, false);
+ if (rc) {
+ dev_err(led->dev,
+ "Flash regulator operate failed(%d)\n",
+ rc);
+ return rc;
+ }
+ }
+ } else {
+ rc = qpnp_led_masked_write(led,
+ FLASH_ENABLE_CONTROL,
+ led->flash_cfg->enable_module &
+ ~FLASH_ENABLE_MODULE_MASK,
+ FLASH_DISABLE_ALL);
+ if (rc) {
+ dev_err(led->dev,
+ "Enable reg write failed(%d)\n", rc);
+ if (led->flash_cfg->torch_enable)
+ goto error_torch_set;
+ else
+ goto error_flash_set;
+ }
+
+ rc = qpnp_flash_regulator_operate(led, false);
+ if (rc) {
+ dev_err(led->dev,
+ "Flash regulator operate failed(%d)\n",
+ rc);
+ return rc;
+ }
+ }
+ }
+
+ qpnp_dump_regs(led, flash_debug_regs, ARRAY_SIZE(flash_debug_regs));
+
+ return 0;
+
+error_reg_write:
+ if (led->flash_cfg->peripheral_subtype == FLASH_SUBTYPE_SINGLE)
+ goto error_flash_set;
+
+error_torch_set:
+ error = qpnp_torch_regulator_operate(led, false);
+ if (error) {
+ dev_err(led->dev,
+ "Torch regulator operate failed(%d)\n", rc);
+ return error;
+ }
+ return rc;
+
+error_flash_set:
+ error = qpnp_flash_regulator_operate(led, false);
+ if (error) {
+ dev_err(led->dev,
+ "Flash regulator operate failed(%d)\n", rc);
+ return error;
+ }
+ return rc;
+}
+
+static void __qpnp_led_work(struct qpnp_led_data *led,
+ enum led_brightness value)
+{
+ int rc;
+
+ mutex_lock(&led->lock);
+
+ switch (led->id) {
+ case QPNP_ID_FLASH1_LED0:
+ case QPNP_ID_FLASH1_LED1:
+ rc = qpnp_flash_set(led);
+ if (rc < 0)
+ dev_err(led->dev,
+ "FLASH set brightness failed (%d)\n", rc);
+ break;
+ default:
+ dev_err(led->dev, "Invalid LED(%d)\n", led->id);
+ break;
+ }
+ mutex_unlock(&led->lock);
+
+}
+
+static void qpnp_led_work(struct work_struct *work)
+{
+ struct qpnp_led_data *led = container_of(work,
+ struct qpnp_led_data, work);
+
+ __qpnp_led_work(led, led->cdev.brightness);
+
+ return;
+}
+
+static void qpnp_led_turn_off_delayed(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct qpnp_led_data *led
+ = container_of(dwork, struct qpnp_led_data, dwork);
+
+ led->cdev.brightness = LED_OFF;
+ qpnp_led_set(&led->cdev, led->cdev.brightness);
+}
+
+static void qpnp_led_turn_off(struct qpnp_led_data *led)
+{
+ INIT_DELAYED_WORK(&led->dwork, qpnp_led_turn_off_delayed);
+ schedule_delayed_work(&led->dwork,
+ msecs_to_jiffies(led->turn_off_delay_ms));
+}
+
+static int qpnp_leds_probe(struct platform_device *pdev)
+{
+ struct qpnp_led_data *led, *led_array;
+ struct device_node *node, *temp;
+ int rc, i, num_leds = 0, parsed_leds = 0;
+ int reg;
+ const char *led_label;
+ bool regulator_probe = false;
+
+ node = pdev->dev.of_node;
+ if (node == NULL)
+ return -ENODEV;
+
+ temp = NULL;
+ while ((temp = of_get_next_child(node, temp)))
+ num_leds++;
+
+ if (!num_leds)
+ return -ECHILD;
+
+ led_array = devm_kzalloc(&pdev->dev,
+ (sizeof(struct qpnp_led_data) * num_leds), GFP_KERNEL);
+ if (!led_array) {
+ dev_err(&pdev->dev, "Unable to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ for_each_child_of_node(node, temp) {
+ led = &led_array[parsed_leds];
+ led->num_leds = num_leds;
+ led->dev = &pdev->dev;
+ led->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!led->regmap)
+ return -ENODEV;
+
+ rc = of_property_read_u32(node, "reg", &reg);
+ if (rc < 0) {
+ dev_err(led->dev,
+ "Failure reading reg, rc = %d\n", rc);
+ goto fail_id_check;
+ }
+ led->base = reg;
+
+ rc = of_property_read_string(temp, "label", &led_label);
+ if (rc < 0) {
+ dev_err(led->dev,
+ "Failure reading label, rc = %d\n", rc);
+ goto fail_id_check;
+ }
+
+ rc = of_property_read_string(temp, "linux,name",
+ &led->cdev.name);
+ if (rc < 0) {
+ dev_err(led->dev,
+ "Failure reading led name, rc = %d\n", rc);
+ goto fail_id_check;
+ }
+
+ rc = of_property_read_u32(temp, "qcom,max-current",
+ &led->max_current);
+ if (rc < 0) {
+ dev_err(led->dev,
+ "Failure reading max_current, rc = %d\n", rc);
+ goto fail_id_check;
+ }
+
+ rc = of_property_read_u32(temp, "qcom,id", &led->id);
+ if (rc < 0) {
+ dev_err(led->dev,
+ "Failure reading led id, rc = %d\n", rc);
+ goto fail_id_check;
+ }
+
+ rc = qpnp_get_common_configs(led, temp);
+ if (rc) {
+ dev_err(led->dev,
+ "Failure reading common led configuration," \
+ " rc = %d\n", rc);
+ goto fail_id_check;
+ }
+
+ led->cdev.brightness_set = qpnp_led_set;
+ led->cdev.brightness_get = qpnp_led_get;
+
+ if (strncmp(led_label, "flash", sizeof("flash")) == 0) {
+ if (!of_find_property(node, "flash-boost-supply", NULL))
+ regulator_probe = true;
+ rc = qpnp_get_config_flash(led, temp, &regulator_probe);
+ if (rc < 0) {
+ dev_err(led->dev,
+ "Unable to read flash config data\n");
+ goto fail_id_check;
+ }
+ } else {
+ dev_err(led->dev, "No LED matching label\n");
+ rc = -EINVAL;
+ goto fail_id_check;
+ }
+
+ mutex_init(&led->lock);
+ INIT_WORK(&led->work, qpnp_led_work);
+
+ rc = qpnp_led_initialize(led);
+ if (rc < 0)
+ goto fail_id_check;
+
+ rc = qpnp_led_set_max_brightness(led);
+ if (rc < 0)
+ goto fail_id_check;
+
+ rc = led_classdev_register(&pdev->dev, &led->cdev);
+ if (rc) {
+ dev_err(&pdev->dev, "unable to register led %d,rc=%d\n",
+ led->id, rc);
+ goto fail_id_check;
+ }
+
+ if (led->id == QPNP_ID_FLASH1_LED0 ||
+ led->id == QPNP_ID_FLASH1_LED1) {
+ rc = sysfs_create_group(&led->cdev.dev->kobj,
+ &led_attr_group);
+ if (rc)
+ goto fail_id_check;
+
+ }
+
+ /* configure default state */
+ if (led->default_on) {
+ led->cdev.brightness = led->cdev.max_brightness;
+ __qpnp_led_work(led, led->cdev.brightness);
+ schedule_work(&led->work);
+ if (led->turn_off_delay_ms > 0)
+ qpnp_led_turn_off(led);
+ } else
+ led->cdev.brightness = LED_OFF;
+
+ parsed_leds++;
+ }
+ dev_set_drvdata(&pdev->dev, led_array);
+ return 0;
+
+fail_id_check:
+ for (i = 0; i < parsed_leds; i++) {
+ mutex_destroy(&led_array[i].lock);
+ led_classdev_unregister(&led_array[i].cdev);
+ }
+
+ return rc;
+}
+
+static int qpnp_leds_remove(struct platform_device *pdev)
+{
+ struct qpnp_led_data *led_array = dev_get_drvdata(&pdev->dev);
+ int i, parsed_leds = led_array->num_leds;
+
+ for (i = 0; i < parsed_leds; i++) {
+ cancel_work_sync(&led_array[i].work);
+ mutex_destroy(&led_array[i].lock);
+ led_classdev_unregister(&led_array[i].cdev);
+ switch (led_array[i].id) {
+ case QPNP_ID_FLASH1_LED0:
+ case QPNP_ID_FLASH1_LED1:
+ if (led_array[i].flash_cfg->flash_reg_get)
+ regulator_put(led_array[i].flash_cfg-> \
+ flash_boost_reg);
+ if (led_array[i].flash_cfg->torch_enable)
+ regulator_put(led_array[i].flash_cfg->\
+ torch_boost_reg);
+ sysfs_remove_group(&led_array[i].cdev.dev->kobj,
+ &led_attr_group);
+ break;
+ default:
+ dev_err(led_array[i].dev,
+ "Invalid LED(%d)\n",
+ led_array[i].id);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static const struct of_device_id qpnp_leds_spmi_of_match[] = {
+ { .compatible = "qcom,leds-qpnp" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, qpnp_leds_spmi_of_match);
+
+static struct platform_driver qpnp_leds_driver = {
+ .driver = {
+ .name = "qcom,leds-qpnp",
+ .of_match_table = of_match_ptr(qpnp_leds_spmi_of_match),
+ },
+ .probe = qpnp_leds_probe,
+ .remove = qpnp_leds_remove,
+};
+module_platform_driver(qpnp_leds_driver);
+
+MODULE_DESCRIPTION("QPNP LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("leds:leds-qpnp");
--
2.29.2