Hi Jacek,
On Wed, Aug 16, 2017 at 10:27:31PM +0200, Jacek Anaszewski wrote:
> Hi Sakari,
>
> Thanks for the patch.
Thanks for the review!
>
> I have few more remarks regarding LED class device naming and
> pm handling below.
>
> On 08/16/2017 02:55 PM, Sakari Ailus wrote:
> > From: Sakari Ailus <sakari.ailus@xxxxxx>
> >
> > 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@xxxxxxxxxxxxxxx>
> > ---
> > MAINTAINERS | 6 +
> > drivers/leds/Kconfig | 8 +
> > drivers/leds/Makefile | 1 +
> > drivers/leds/leds-as3645a.c | 785 ++++++++++++++++++++++++++++++++++++++++++++
> > 4 files changed, 800 insertions(+)
> > create mode 100644 drivers/leds/leds-as3645a.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 931abca006b7..8f40ba2e5303 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -2124,6 +2124,12 @@ F: arch/arm64/
> > F: Documentation/arm64/
> >
> > AS3645A LED FLASH CONTROLLER DRIVER
> > +M: Sakari Ailus <sakari.ailus@xxxxxx>
> > +L: linux-leds@xxxxxxxxxxxxxxx
> > +S: Maintained
> > +F: drivers/leds/leds-as3645a.c
> > +
> > +AS3645A LED FLASH CONTROLLER DRIVER
> > M: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> > L: linux-media@xxxxxxxxxxxxxxx
> > 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..2335510a08e1
> > --- /dev/null
> > +++ b/drivers/leds/leds-as3645a.c
> > @@ -0,0 +1,785 @@
> > +/*
> > + * 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@xxxxxx>
> > + *
> > + * 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_names {
> > + char flash[32];
> > + char indicator[32];
> > +};
> > +
> > +struct as3645a {
> > + struct i2c_client *client;
> > +
> > + struct mutex mutex;
> > +
> > + struct led_classdev_flash fled;
> > + struct led_classdev iled_cdev;
> > +
> > + struct v4l2_flash *vf;
> > + struct v4l2_flash *vfind;
> > +
> > + struct device_node *flash_node;
> > + struct device_node *indicator_node;
> > +
> > + 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 as3645a_names *names,
> > + struct device_node *node)
> > +{
> > + struct as3645a_config *cfg = &flash->cfg;
> > + const char *name;
> > + int rval;
> > +
> > + flash->flash_node = of_get_child_by_name(node, "flash");
> > + if (!flash->flash_node) {
> > + dev_err(&flash->client->dev, "can't find flash node\n");
> > + return -ENODEV;
> > + }
> > +
> > + rval = of_property_read_string(flash->flash_node, "label", &name);
> > + if (!rval)
> > + strlcpy(names->flash, name, sizeof(names->flash));
> > + else
> > + snprintf(names->flash, sizeof(names->flash),
> > + "%s:flash", node->name);
>
> In your DT bindings example you have nodes "flash" and "indicator".
> In case label is not provided you'd get the LED class device names
> flash:flash and indicator:indicator respectively :-)
>
> I presume you want the following instead:
>
> snprintf(names->flash, sizeof(names->flash),
> AS_NAME":%s", node->name);
>
> > + rval = of_property_read_u32(flash->flash_node, "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(flash->flash_node, "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(flash->flash_node, "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(flash->flash_node, "voltage-reference",
> > + &cfg->voltage_reference);
> > +
> > + of_property_read_u32(flash->flash_node, "peak-current-limit",
> > + &cfg->peak);
> > + cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
> > +
> > + flash->indicator_node = of_get_child_by_name(node, "indicator");
> > + if (!flash->indicator_node) {
> > + dev_warn(&flash->client->dev,
> > + "can't find indicator node\n");
> > + goto out_err;
> > + }
> > +
> > + rval = of_property_read_string(flash->indicator_node, "label", &name);
> > + if (!rval)
> > + strlcpy(names->indicator, name, sizeof(names->indicator));
> > + else
> > + snprintf(names->indicator, sizeof(names->indicator),
> > + "%s:indicator", node->name);
>
>
> snprintf(names->indicator, sizeof(names->indicator),
> AS_NAME":%s", node->name);
The node names are always the same as per binding documentation they shall
be called "flash" and "indicator". Would it be wrong to use device node's
name? (That's what I did in v2 actually.)
>
> > +
> > + rval = of_property_read_u32(flash->indicator_node, "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;
> > + }
> > +
> > + return 0;
> > +
> > +out_err:
> > + of_node_put(flash->flash_node);
> > + of_node_put(flash->indicator_node);
> > +
> > + return rval;
> > +}
> > +
> > +static int as3645a_led_class_setup(struct as3645a *flash,
> > + struct as3645a_names *names)
> > +{
> > + 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 = names->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 = names->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 = {
> > + .intensity = {
> > + .min = AS_TORCH_INTENSITY_MIN,
> > + .max = flash->cfg.assist_max_ua,
> > + .step = AS_TORCH_INTENSITY_STEP,
> > + .val = flash->cfg.assist_max_ua,
> > + },
> > + };
> > + struct v4l2_flash_config cfgind = {
> > + .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));
> > + strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
> > +
> > + flash->vf = v4l2_flash_init(
> > + &flash->client->dev, of_fwnode_handle(flash->flash_node),
> > + &flash->fled, NULL, &cfg);
> > + if (IS_ERR(flash->vf))
> > + return PTR_ERR(flash->vf);
> > +
> > + flash->vfind = v4l2_flash_indicator_init(
> > + &flash->client->dev, of_fwnode_handle(flash->indicator_node),
> > + &flash->iled_cdev, &cfgind);
> > + if (IS_ERR(flash->vfind)) {
> > + v4l2_flash_release(flash->vf);
> > + return PTR_ERR(flash->vfind);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int as3645a_probe(struct i2c_client *client)
> > +{
> > + struct as3645a_names names;
> > + 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, &names, client->dev.of_node);
> > + if (rval < 0)
> > + return rval;
> > +
> > + rval = as3645a_detect(flash);
> > + if (rval < 0)
> > + goto out_put_nodes;
> > +
> > + 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, &names);
> > + 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);
> > +
> > +out_put_nodes:
> > + of_node_put(flash->flash_node);
> > + of_node_put(flash->indicator_node);
> > +
> > + 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);
> > +
> > + of_node_put(flash->flash_node);
> > + of_node_put(flash->indicator_node);
> > +
> > + 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,
>
> LED subsystem already installs its own pm ops (see led-class.c)
> and sets brightness on all LED class devices to LED_OFF on suspend
> and brings it back on resume.
>
> If you set LED_CORE_SUSPENDRESUME flag, then you could get rid
> of as3645a_resume() and as3645a_suspend() and turn the device in power
> down mode (if it has one) always when both flash and indicator LED are
> off (if it makes sense from power comsumption POV).
Fixed.
>
> > + },
> > + .probe_new = as3645a_probe,
> > + .remove = as3645a_remove,
> > +};
> > +
> > +module_i2c_driver(as3645a_i2c_driver);
> > +
> > +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>");
> > +MODULE_AUTHOR("Sakari Ailus <sakari.ailus@xxxxxx>");
> > +MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
> > +MODULE_LICENSE("GPL v2");
> >
>
> --
> Best regards,
> Jacek Anaszewski
--
Sakari Ailus
e-mail: sakari.ailus@xxxxxx
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