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

Jacek Anaszewski
2017-07-19T20:18:10Z

Hi Sakari,

Thanks for the update.

My remarks from [0] related to LED class device naming apply also
to this version of the patch.

[0[ https://www.spinics.net/lists/linux-leds/msg08015.html

Best regards,
Jacek Anaszewski

On 07/18/2017 09:03 PM, Sakari Ailus wrote:
> 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");
>