[RFC 05/19] leds: as3645a: Add LED flash class driver

Sakari Ailus
2017-07-18T19:04:06Z

From: Sakari Ailus <sakari.ailus@iki.fi>

Add a LED flash class driver for the as3654a flash controller. A V4L2 flash
driver for it already exists (drivers/media/i2c/as3645a.c), and this driver
is based on that.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
MAINTAINERS | 6 +
drivers/leds/Kconfig | 8 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-as3645a.c | 742 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 757 insertions(+)
create mode 100644 drivers/leds/leds-as3645a.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 205d3977ac46..312be8939969 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2106,6 +2106,12 @@ F: arch/arm64/
F: Documentation/arm64/

AS3645A LED FLASH CONTROLLER DRIVER
+M: Sakari Ailus <sakari.ailus@iki.fi>
+L: linux-leds@vger.kernel.org
+S: Maintained
+F: drivers/leds/leds-as3645a.c
+
+AS3645A LED FLASH CONTROLLER DRIVER
M: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
L: linux-media@vger.kernel.org
T: git git://linuxtv.org/media_tree.git
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 594b24d410c3..bad3a4098104 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -58,6 +58,14 @@ config LEDS_AAT1290
help
This option enables support for the LEDs on the AAT1290.

+config LEDS_AS3645A
+ tristate "AS3645A LED flash controller support"
+ depends on I2C && LEDS_CLASS_FLASH
+ help
+ Enable LED flash class support for AS3645A LED flash
+ controller. V4L2 flash API is provided as well if
+ CONFIG_V4L2_FLASH_API is enabled.
+
config LEDS_BCM6328
tristate "LED Support for Broadcom BCM6328"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 909dae62ba05..7d7b26552923 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
# LED Platform Drivers
obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
+obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o
obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o
obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o
obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
diff --git a/drivers/leds/leds-as3645a.c b/drivers/leds/leds-as3645a.c
new file mode 100644
index 000000000000..b1dc32a3c620
--- /dev/null
+++ b/drivers/leds/leds-as3645a.c
@@ -0,0 +1,742 @@
+/*
+ * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
+ *
+ * Copyright (C) 2008-2011 Nokia Corporation
+ * Copyright (c) 2011, 2017 Intel Corporation.
+ *
+ * Based on drivers/media/i2c/as3645a.c.
+ *
+ * Contact: Sakari Ailus <sakari.ailus@iki.fi>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * 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.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/led-class-flash.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-flash-led-class.h>
+
+#define AS_TIMER_US_TO_CODE(t) (((t) / 1000 - 100) / 50)
+#define AS_TIMER_CODE_TO_US(c) ((50 * (c) + 100) * 1000)
+
+/* Register definitions */
+
+/* Read-only Design info register: Reset state: xxxx 0001 */
+#define AS_DESIGN_INFO_REG 0x00
+#define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4))
+#define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f)
+
+/* Read-only Version control register: Reset state: 0000 0000
+ * for first engineering samples
+ */
+#define AS_VERSION_CONTROL_REG 0x01
+#define AS_VERSION_CONTROL_RFU(x) (((x) >> 4))
+#define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f)
+
+/* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
+#define AS_INDICATOR_AND_TIMER_REG 0x02
+#define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0
+#define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4
+#define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6
+
+/* Read / Write (Current set register): Reset state: 0110 1001 */
+#define AS_CURRENT_SET_REG 0x03
+#define AS_CURRENT_ASSIST_LIGHT_SHIFT 0
+#define AS_CURRENT_LED_DET_ON (1 << 3)
+#define AS_CURRENT_FLASH_CURRENT_SHIFT 4
+
+/* Read / Write (Control register): Reset state: 1011 0100 */
+#define AS_CONTROL_REG 0x04
+#define AS_CONTROL_MODE_SETTING_SHIFT 0
+#define AS_CONTROL_STROBE_ON (1 << 2)
+#define AS_CONTROL_OUT_ON (1 << 3)
+#define AS_CONTROL_EXT_TORCH_ON (1 << 4)
+#define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5)
+#define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5)
+#define AS_CONTROL_COIL_PEAK_SHIFT 6
+
+/* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
+#define AS_FAULT_INFO_REG 0x05
+#define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1)
+#define AS_FAULT_INFO_INDICATOR_LED (1 << 2)
+#define AS_FAULT_INFO_LED_AMOUNT (1 << 3)
+#define AS_FAULT_INFO_TIMEOUT (1 << 4)
+#define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5)
+#define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6)
+#define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7)
+
+/* Boost register */
+#define AS_BOOST_REG 0x0d
+#define AS_BOOST_CURRENT_DISABLE (0 << 0)
+#define AS_BOOST_CURRENT_ENABLE (1 << 0)
+
+/* Password register is used to unlock boost register writing */
+#define AS_PASSWORD_REG 0x0f
+#define AS_PASSWORD_UNLOCK_VALUE 0x55
+
+#define AS_NAME "as3645a"
+#define AS_I2C_ADDR (0x60 >> 1) /* W:0x60, R:0x61 */
+
+#define AS_FLASH_TIMEOUT_MIN 100000 /* us */
+#define AS_FLASH_TIMEOUT_MAX 850000
+#define AS_FLASH_TIMEOUT_STEP 50000
+
+#define AS_FLASH_INTENSITY_MIN 200000 /* uA */
+#define AS_FLASH_INTENSITY_MAX_1LED 500000
+#define AS_FLASH_INTENSITY_MAX_2LEDS 400000
+#define AS_FLASH_INTENSITY_STEP 20000
+
+#define AS_TORCH_INTENSITY_MIN 20000 /* uA */
+#define AS_TORCH_INTENSITY_MAX 160000
+#define AS_TORCH_INTENSITY_STEP 20000
+
+#define AS_INDICATOR_INTENSITY_MIN 0 /* uA */
+#define AS_INDICATOR_INTENSITY_MAX 10000
+#define AS_INDICATOR_INTENSITY_STEP 2500
+
+#define AS_PEAK_mA_MAX 2000
+#define AS_PEAK_mA_TO_REG(a) \
+ ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
+
+enum as_mode {
+ AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
+ AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
+ AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
+ AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
+};
+
+struct as3645a_config {
+ u32 flash_timeout_us;
+ u32 flash_max_ua;
+ u32 assist_max_ua;
+ u32 indicator_max_ua;
+ u32 voltage_reference;
+ u32 peak;
+};
+
+struct as3645a {
+ struct i2c_client *client;
+
+ struct mutex mutex;
+
+ struct led_classdev_flash fled;
+ struct led_classdev iled_cdev;
+
+ struct v4l2_flash *vf;
+
+ struct as3645a_config cfg;
+
+ enum as_mode mode;
+ unsigned int timeout;
+ unsigned int flash_current;
+ unsigned int assist_current;
+ unsigned int indicator_current;
+ enum v4l2_flash_strobe_source strobe_source;
+};
+
+#define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
+#define iled_cdev_to_as3645a(__iled_cdev) \
+ container_of(__iled_cdev, struct as3645a, iled_cdev)
+
+/* Return negative errno else zero on success */
+static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
+{
+ struct i2c_client *client = flash->client;
+ int rval;
+
+ rval = i2c_smbus_write_byte_data(client, addr, val);
+
+ dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
+ rval < 0 ? "fail" : "ok");
+
+ return rval;
+}
+
+/* Return negative errno else a data byte received from the device. */
+static int as3645a_read(struct as3645a *flash, u8 addr)
+{
+ struct i2c_client *client = flash->client;
+ int rval;
+
+ rval = i2c_smbus_read_byte_data(client, addr);
+
+ dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
+ rval < 0 ? "fail" : "ok");
+
+ return rval;
+}
+
+/* -----------------------------------------------------------------------------
+ * Hardware configuration and trigger
+ */
+
+/**
+ * as3645a_set_config - Set flash configuration registers
+ * @flash: The flash
+ *
+ * Configure the hardware with flash, assist and indicator currents, as well as
+ * flash timeout.
+ *
+ * Return 0 on success, or a negative error code if an I2C communication error
+ * occurred.
+ */
+static int as3645a_set_current(struct as3645a *flash)
+{
+ u8 val;
+
+ val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
+ | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
+ | AS_CURRENT_LED_DET_ON;
+
+ return as3645a_write(flash, AS_CURRENT_SET_REG, val);
+}
+
+static int as3645a_set_timeout(struct as3645a *flash)
+{
+ u8 val;
+
+ val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
+
+ val |= (flash->cfg.voltage_reference
+ << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
+ | ((flash->indicator_current ? flash->indicator_current - 1 : 0)
+ << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
+
+ return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
+}
+
+/**
+ * as3645a_set_control - Set flash control register
+ * @flash: The flash
+ * @mode: Desired output mode
+ * @on: Desired output state
+ *
+ * Configure the hardware with output mode and state.
+ *
+ * Return 0 on success, or a negative error code if an I2C communication error
+ * occurred.
+ */
+static int
+as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
+{
+ u8 reg;
+
+ /* Configure output parameters and operation mode. */
+ reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
+ | (on ? AS_CONTROL_OUT_ON : 0)
+ | mode;
+
+ if (mode == AS_MODE_FLASH &&
+ flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
+ reg |= AS_CONTROL_STROBE_TYPE_LEVEL
+ | AS_CONTROL_STROBE_ON;
+
+ return as3645a_write(flash, AS_CONTROL_REG, reg);
+}
+
+static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
+{
+ struct as3645a *flash = fled_to_as3645a(fled);
+ int rval;
+
+ /* NOTE: reading register clears fault status */
+ rval = as3645a_read(flash, AS_FAULT_INFO_REG);
+ if (rval < 0)
+ return rval;
+
+ if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
+ *fault |= LED_FAULT_OVER_CURRENT;
+
+ if (rval & AS_FAULT_INFO_INDICATOR_LED)
+ *fault |= LED_FAULT_INDICATOR;
+
+ dev_dbg(&flash->client->dev, "%u connected LEDs\n",
+ rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
+
+ if (rval & AS_FAULT_INFO_TIMEOUT)
+ *fault |= LED_FAULT_TIMEOUT;
+
+ if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
+ *fault |= LED_FAULT_OVER_TEMPERATURE;
+
+ if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
+ *fault |= LED_FAULT_OVER_CURRENT;
+
+ if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
+ *fault |= LED_FAULT_INPUT_VOLTAGE;
+
+ return rval;
+}
+
+static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
+ unsigned int step,
+ unsigned int val)
+{
+ if (val < min)
+ val = min;
+
+ if (val > max)
+ val = max;
+
+ return (val - min) / step;
+}
+
+static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
+ unsigned int ua)
+{
+ if (is_flash)
+ return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
+ flash->cfg.assist_max_ua,
+ AS_TORCH_INTENSITY_STEP, ua);
+ else
+ return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
+ flash->cfg.flash_max_ua,
+ AS_FLASH_INTENSITY_STEP, ua);
+}
+
+static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
+ enum led_brightness brightness)
+{
+ struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
+ int rval;
+
+ flash->indicator_current = brightness;
+
+ rval = as3645a_set_timeout(flash);
+ if (rval)
+ return rval;
+
+ return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
+}
+
+static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
+ struct as3645a *flash = fled_to_as3645a(fled);
+ int rval;
+
+ if (brightness) {
+ /* Register value 0 is 20 mA. */
+ flash->assist_current = brightness - 1;
+
+ rval = as3645a_set_current(flash);
+ if (rval)
+ return rval;
+ }
+
+ return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
+}
+
+static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
+ u32 brightness_ua)
+{
+ struct as3645a *flash = fled_to_as3645a(fled);
+
+ flash->flash_current = as3645a_current_to_reg(flash, true, brightness_ua);
+
+ return as3645a_set_current(flash);
+}
+
+static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
+ u32 timeout_us)
+{
+ struct as3645a *flash = fled_to_as3645a(fled);
+
+ flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
+
+ return as3645a_set_timeout(flash);
+}
+
+static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
+{
+ struct as3645a *flash = fled_to_as3645a(fled);
+
+ return as3645a_set_control(flash, AS_MODE_FLASH, state);
+}
+
+static const struct led_flash_ops as3645a_led_flash_ops = {
+ .flash_brightness_set = as3645a_set_flash_brightness,
+ .timeout_set = as3645a_set_flash_timeout,
+ .strobe_set = as3645a_set_strobe,
+ .fault_get = as3645a_get_fault,
+};
+
+static int as3645a_setup(struct as3645a *flash)
+{
+ struct device *dev = &flash->client->dev;
+ u32 fault = 0;
+ int rval;
+
+ /* clear errors */
+ rval = as3645a_read(flash, AS_FAULT_INFO_REG);
+ if (rval < 0)
+ return rval;
+
+ dev_dbg(dev, "Fault info: %02x\n", rval);
+
+ rval = as3645a_set_current(flash);
+ if (rval < 0)
+ return rval;
+
+ rval = as3645a_set_timeout(flash);
+ if (rval < 0)
+ return rval;
+
+ rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
+ if (rval < 0)
+ return rval;
+
+ /* read status */
+ rval = as3645a_get_fault(&flash->fled, &fault);
+ if (rval < 0)
+ return rval;
+
+ dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
+ as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
+ dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
+ as3645a_read(flash, AS_CURRENT_SET_REG));
+ dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
+ as3645a_read(flash, AS_CONTROL_REG));
+
+ return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
+}
+
+static int as3645a_detect(struct as3645a *flash)
+{
+ struct device *dev = &flash->client->dev;
+ int rval, man, model, rfu, version;
+ const char *vendor;
+
+ rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
+ if (rval < 0) {
+ dev_err(dev, "can't read design info reg\n");
+ return rval;
+ }
+
+ man = AS_DESIGN_INFO_FACTORY(rval);
+ model = AS_DESIGN_INFO_MODEL(rval);
+
+ rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
+ if (rval < 0) {
+ dev_err(dev, "can't read version control reg\n");
+ return rval;
+ }
+
+ rfu = AS_VERSION_CONTROL_RFU(rval);
+ version = AS_VERSION_CONTROL_VERSION(rval);
+
+ /* Verify the chip model and version. */
+ if (model != 0x01 || rfu != 0x00) {
+ dev_err(dev, "AS3645A not detected "
+ "(model %d rfu %d)\n", model, rfu);
+ return -ENODEV;
+ }
+
+ switch (man) {
+ case 1:
+ vendor = "AMS, Austria Micro Systems";
+ break;
+ case 2:
+ vendor = "ADI, Analog Devices Inc.";
+ break;
+ case 3:
+ vendor = "NSC, National Semiconductor";
+ break;
+ case 4:
+ vendor = "NXP";
+ break;
+ case 5:
+ vendor = "TI, Texas Instrument";
+ break;
+ default:
+ vendor = "Unknown";
+ }
+
+ dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
+ man, version);
+
+ rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
+ if (rval < 0)
+ return rval;
+
+ return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
+}
+
+static __maybe_unused int as3645a_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct as3645a *flash = i2c_get_clientdata(client);
+ int rval;
+
+ rval = as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
+
+ dev_dbg(dev, "Suspend %s\n", rval < 0 ? "failed" : "ok");
+
+ return rval;
+}
+
+static __maybe_unused int as3645a_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct as3645a *flash = i2c_get_clientdata(client);
+ int rval;
+
+ rval = as3645a_setup(flash);
+
+ dev_dbg(dev, "Resume %s\n", rval < 0 ? "fail" : "ok");
+
+ return rval;
+}
+
+static int as3645a_parse_node(struct as3645a *flash,
+ struct device_node *node)
+{
+ struct as3645a_config *cfg = &flash->cfg;
+ struct device_node *child;
+ int rval;
+
+ child = of_get_child_by_name(node, "flash");
+ if (!child) {
+ dev_err(&flash->client->dev, "can't find flash node\n");
+ return -ENODEV;
+ }
+
+ rval = of_property_read_u32(child, "flash-timeout-us",
+ &cfg->flash_timeout_us);
+ if (rval < 0) {
+ dev_err(&flash->client->dev,
+ "can't read flash-timeout-us property for flash\n");
+ goto out_err;
+ }
+
+ rval = of_property_read_u32(child, "flash-max-microamp",
+ &cfg->flash_max_ua);
+ if (rval < 0) {
+ dev_err(&flash->client->dev,
+ "can't read flash-max-microamp property for flash\n");
+ goto out_err;
+ }
+
+ rval = of_property_read_u32(child, "led-max-microamp",
+ &cfg->assist_max_ua);
+ if (rval < 0) {
+ dev_err(&flash->client->dev,
+ "can't read led-max-microamp property for flash\n");
+ goto out_err;
+ }
+
+ of_property_read_u32(child, "voltage-reference",
+ &cfg->voltage_reference);
+
+ of_property_read_u32(child, "peak-current-limit", &cfg->peak);
+ cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
+
+ of_node_put(child);
+
+ child = of_get_child_by_name(node, "indicator");
+ if (!child) {
+ dev_warn(&flash->client->dev,
+ "can't find indicator node\n");
+ return 0;
+ }
+
+ rval = of_property_read_u32(child, "led-max-microamp",
+ &cfg->indicator_max_ua);
+ if (rval < 0) {
+ dev_err(&flash->client->dev,
+ "can't read led-max-microamp property for indicator\n");
+ goto out_err;
+ }
+
+ of_node_put(child);
+
+ return 0;
+
+out_err:
+ of_node_put(child);
+
+ return rval;
+}
+
+static int as3645a_led_class_setup(struct as3645a *flash)
+{
+ struct led_classdev *fled_cdev = &flash->fled.led_cdev;
+ struct led_classdev *iled_cdev = &flash->iled_cdev;
+ struct led_flash_setting *cfg;
+ int rval;
+
+ iled_cdev->name = "as3645a indicator";
+ iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
+ iled_cdev->max_brightness =
+ flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
+
+ rval = led_classdev_register(&flash->client->dev, iled_cdev);
+ if (rval < 0)
+ return rval;
+
+ cfg = &flash->fled.brightness;
+ cfg->min = AS_FLASH_INTENSITY_MIN;
+ cfg->max = flash->cfg.flash_max_ua;
+ cfg->step = AS_FLASH_INTENSITY_STEP;
+ cfg->val = flash->cfg.flash_max_ua;
+
+ cfg = &flash->fled.timeout;
+ cfg->min = AS_FLASH_TIMEOUT_MIN;
+ cfg->max = flash->cfg.flash_timeout_us;
+ cfg->step = AS_FLASH_TIMEOUT_STEP;
+ cfg->val = flash->cfg.flash_timeout_us;
+
+ flash->fled.ops = &as3645a_led_flash_ops;
+
+ fled_cdev->name = "as3645a flash";
+ fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
+ /* Value 0 is off in LED class. */
+ fled_cdev->max_brightness =
+ as3645a_current_to_reg(flash, false,
+ flash->cfg.assist_max_ua) + 1;
+ fled_cdev->flags = LED_DEV_CAP_FLASH;
+
+ rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
+ if (rval) {
+ led_classdev_unregister(iled_cdev);
+ dev_err(&flash->client->dev,
+ "led_classdev_flash_register() failed, error %d\n",
+ rval);
+ }
+
+ return rval;
+}
+
+static int as3645a_v4l2_setup(struct as3645a *flash)
+{
+ struct led_classdev_flash *fled = &flash->fled;
+ struct led_classdev *led = &fled->led_cdev;
+ struct v4l2_flash_config cfg = {
+ .torch_intensity = {
+ .min = AS_TORCH_INTENSITY_MIN,
+ .max = flash->cfg.assist_max_ua,
+ .step = AS_TORCH_INTENSITY_STEP,
+ .val = flash->cfg.assist_max_ua,
+ },
+ .indicator_intensity = {
+ .min = AS_INDICATOR_INTENSITY_MIN,
+ .max = flash->cfg.indicator_max_ua,
+ .step = AS_INDICATOR_INTENSITY_STEP,
+ .val = flash->cfg.indicator_max_ua,
+ },
+ };
+
+ strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
+
+ flash->vf = v4l2_flash_init(&flash->client->dev, NULL, &flash->fled,
+ &flash->iled_cdev, NULL, &cfg);
+ if (IS_ERR(flash->vf))
+ return PTR_ERR(flash->vf);
+
+ return 0;
+}
+
+static int as3645a_probe(struct i2c_client *client)
+{
+ struct as3645a *flash;
+ int rval;
+
+ if (client->dev.of_node == NULL)
+ return -ENODEV;
+
+ flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
+ if (flash == NULL)
+ return -ENOMEM;
+
+ flash->client = client;
+
+ rval = as3645a_parse_node(flash, client->dev.of_node);
+ if (rval < 0)
+ return rval;
+
+ rval = as3645a_detect(flash);
+ if (rval < 0)
+ return rval;
+
+ mutex_init(&flash->mutex);
+ i2c_set_clientdata(client, flash);
+
+ rval = as3645a_setup(flash);
+ if (rval)
+ goto out_mutex_destroy;
+
+ rval = as3645a_led_class_setup(flash);
+ if (rval)
+ goto out_mutex_destroy;
+
+ rval = as3645a_v4l2_setup(flash);
+ if (rval)
+ goto out_led_classdev_flash_unregister;
+
+ return 0;
+
+out_led_classdev_flash_unregister:
+ led_classdev_flash_unregister(&flash->fled);
+
+out_mutex_destroy:
+ mutex_destroy(&flash->mutex);
+
+ return rval;
+}
+
+static int as3645a_remove(struct i2c_client *client)
+{
+ struct as3645a *flash = i2c_get_clientdata(client);
+
+ as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
+
+ v4l2_flash_release(flash->vf);
+
+ led_classdev_flash_unregister(&flash->fled);
+ led_classdev_unregister(&flash->iled_cdev);
+
+ mutex_destroy(&flash->mutex);
+
+ return 0;
+}
+
+static const struct of_device_id as3645a_of_table[] = {
+ { .compatible = "ams,as3645a" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, as3645a_of_table);
+
+SIMPLE_DEV_PM_OPS(as3645a_pm_ops, as3645a_resume, as3645a_suspend);
+
+static struct i2c_driver as3645a_i2c_driver = {
+ .driver = {
+ .of_match_table = as3645a_of_table,
+ .name = AS_NAME,
+ .pm = &as3645a_pm_ops,
+ },
+ .probe_new = as3645a_probe,
+ .remove = as3645a_remove,
+};
+
+module_i2c_driver(as3645a_i2c_driver);
+
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
+MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
+MODULE_LICENSE("GPL v2");
--
2.11.0