[PATCH 0/3] AS3645A flash support

[PATCH 0/3] AS3645A flash support

[Sakari Ailus]

Hi everyone,

This set adds support for the AS3645A flash driver which can be found e.g.
in Nokia N9.

The set depeds on the flash patches here so I'd prefer to merge this
through mediatree.

<URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=flash>

Jacek: would that be ok for you?

Since the RFC set:

- Add back the DT binding documentation I lost long ago.

- Use colon (":") in the default names instead of a space.

Sakari Ailus (3):
  dt: bindings: Document DT bindings for Analog devices as3645a
  leds: as3645a: Add LED flash class driver
  arm: dts: omap3: N9/N950: Add AS3645A camera flash

 .../devicetree/bindings/leds/ams,as3645a.txt       |  56 ++
 MAINTAINERS                                        |   6 +
 arch/arm/boot/dts/omap3-n9.dts                     |   1 +
 arch/arm/boot/dts/omap3-n950-n9.dtsi               |  14 +
 arch/arm/boot/dts/omap3-n950.dts                   |   1 +
 drivers/leds/Kconfig                               |   8 +
 drivers/leds/Makefile                              |   1 +
 drivers/leds/leds-as3645a.c                        | 785 +++++++++++++++++++++
 8 files changed, 872 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ams,as3645a.txt
 create mode 100644 drivers/leds/leds-as3645a.c

-- 
2.11.0

[PATCH 1/3] dt: bindings: Document DT bindings for Analog devices as3645a

[Sakari Ailus]

From: Sakari Ailus <sakari.ailus-X3B1VOXEql0@public.gmane.org>

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 .../devicetree/bindings/leds/ams,as3645a.txt       | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ams,as3645a.txt

diff --git a/Documentation/devicetree/bindings/leds/ams,as3645a.txt b/Documentation/devicetree/bindings/leds/ams,as3645a.txt
new file mode 100644
index 000000000000..00066e3f9036
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/ams,as3645a.txt
@@ -0,0 +1,56 @@
+Analog devices AS3645A device tree bindings
+
+The AS3645A flash LED controller can drive two LEDs, one high current
+flash LED and one indicator LED. The high current flash LED can be
+used in torch mode as well.
+
+Ranges below noted as [a, b] are closed ranges between a and b, i.e. a
+and b are included in the range.
+
+
+Required properties
+===================
+
+compatible	: Must be "ams,as3645a".
+reg		: The I2C address of the device. Typically 0x30.
+
+
+Required properties of the "flash" child node
+=============================================
+
+flash-timeout-us: Flash timeout in microseconds. The value must be in
+		  the range [100000, 850000] and divisible by 50000.
+flash-max-microamp: Maximum flash current in microamperes. Has to be
+		    in the range between [200000, 500000] and
+		    divisible by 20000.
+led-max-microamp: Maximum torch (assist) current in microamperes. The
+		  value must be in the range between [20000, 160000] and
+		  divisible by 20000.
+ams,input-max-microamp: Maximum flash controller input current. The
+			value must be in the range [1250000, 2000000]
+			and divisible by 50000.
+
+
+Required properties of the "indicator" child node
+=================================================
+
+led-max-microamp: Maximum indicator current. The allowed values are
+		  2500, 5000, 7500 and 10000.
+
+
+Example
+=======
+
+	as3645a: flash@30 {
+		reg = <0x30>;
+		compatible = "ams,as3645a";
+		flash {
+			flash-timeout-us = <150000>;
+			flash-max-microamp = <320000>;
+			led-max-microamp = <60000>;
+			ams,input-max-microamp = <1750000>;
+		};
+		indicator {
+			led-max-microamp = <10000>;
+		};
+	};
-- 
2.11.0

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[PATCH 2/3] leds: as3645a: Add LED flash class driver

[Sakari Ailus]

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 | 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@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..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@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_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);
+
+	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);
+
+	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,
+	},
+	.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

Re: [PATCH 2/3] leds: as3645a: Add LED flash class driver

[Javier Martinez Canillas]

Hello Sakari,

I haven't looked at the driver, but just have a comment about the I2C subsystem.

On Wed, Aug 16, 2017 at 2:55 PM, Sakari Ailus
<sakari.ailus@linux.intel.com> wrote:

[snip]

> +
> +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);
> +

The I2C core is still broken w.r.t reporting a proper MODALIAS for OF
registered devices, it will report a MODALIAS=i2c:as3645a in this
case. So if you build this as a module, autoload won't work.

In theory this will be fixed soon, but for now you should add a
i2c_device_id table and export it with MODULE_DEVICE_TABLE(i2c,...) if
you care about module autoloading.

Best regards,
Javier

Re: [PATCH 2/3] leds: as3645a: Add LED flash class driver

[Jacek Anaszewski]

Hi Sakari,

Thanks for the patch.

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@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 | 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@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..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@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_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);

> +
> +	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).

> +	},
> +	.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");
> 

-- 
Best regards,
Jacek Anaszewski

Re: [PATCH 2/3] leds: as3645a: Add LED flash class driver

[Sakari Ailus]

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-X3B1VOXEql0@public.gmane.org>
> > 
> > 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-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> > ---
> >  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-X3B1VOXEql0@public.gmane.org>
> > +L:	linux-leds-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > +S:	Maintained
> > +F:	drivers/leds/leds-as3645a.c
> > +
> > +AS3645A LED FLASH CONTROLLER DRIVER
> >  M:	Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
> >  L:	linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.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..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-X3B1VOXEql0@public.gmane.org>
> > + *
> > + * 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-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>");
> > +MODULE_AUTHOR("Sakari Ailus <sakari.ailus-X3B1VOXEql0@public.gmane.org>");
> > +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-X3B1VOXEql0@public.gmane.org
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[PATCH 3/3] arm: dts: omap3: N9/N950: Add AS3645A camera flash

[Sakari Ailus]

From: Sakari Ailus <sakari.ailus-X3B1VOXEql0@public.gmane.org>

Add the as3645a flash controller to the DT source as well as the flash
property with the as3645a device phandle to the sensor DT node.

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Reviewed-by: Sebastian Reichel <sebastian.reichel-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org>
---
 arch/arm/boot/dts/omap3-n9.dts       |  1 +
 arch/arm/boot/dts/omap3-n950-n9.dtsi | 14 ++++++++++++++
 arch/arm/boot/dts/omap3-n950.dts     |  1 +
 3 files changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/omap3-n9.dts b/arch/arm/boot/dts/omap3-n9.dts
index b9e58c536afd..a2944010f62f 100644
--- a/arch/arm/boot/dts/omap3-n9.dts
+++ b/arch/arm/boot/dts/omap3-n9.dts
@@ -26,6 +26,7 @@
 		clocks = <&isp 0>;
 		clock-frequency = <9600000>;
 		nokia,nvm-size = <(16 * 64)>;
+		flash = <&as3645a_flash &as3645a_indicator>;
 		port {
 			smia_1_1: endpoint {
 				link-frequencies = /bits/ 64 <199200000 210000000 499200000>;
diff --git a/arch/arm/boot/dts/omap3-n950-n9.dtsi b/arch/arm/boot/dts/omap3-n950-n9.dtsi
index df3366fa5409..e15722b83a70 100644
--- a/arch/arm/boot/dts/omap3-n950-n9.dtsi
+++ b/arch/arm/boot/dts/omap3-n950-n9.dtsi
@@ -265,6 +265,20 @@
 
 &i2c2 {
 	clock-frequency = <400000>;
+
+	as3645a: flash@30 {
+		reg = <0x30>;
+		compatible = "ams,as3645a";
+		as3645a_flash: flash {
+			flash-timeout-us = <150000>;
+			flash-max-microamp = <320000>;
+			led-max-microamp = <60000>;
+			peak-current-limit = <1750000>;
+		};
+		as3645a_indicator: indicator {
+			led-max-microamp = <10000>;
+		};
+	};
 };
 
 &i2c3 {
diff --git a/arch/arm/boot/dts/omap3-n950.dts b/arch/arm/boot/dts/omap3-n950.dts
index 646601a3ebd8..bba5c5a6950c 100644
--- a/arch/arm/boot/dts/omap3-n950.dts
+++ b/arch/arm/boot/dts/omap3-n950.dts
@@ -60,6 +60,7 @@
 		clocks = <&isp 0>;
 		clock-frequency = <9600000>;
 		nokia,nvm-size = <(16 * 64)>;
+		flash = <&as3645a_flash &as3645a_indicator>;
 		port {
 			smia_1_1: endpoint {
 				link-frequencies = /bits/ 64 <210000000 333600000 398400000>;
-- 
2.11.0

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Re: [PATCH 1/3] dt: bindings: Document DT bindings for Analog devices as3645a

[Jacek Anaszewski]

Hi Sakari,

Thanks for the patch. One issue below.

On 08/16/2017 02:55 PM, Sakari Ailus wrote:
> From: Sakari Ailus <sakari.ailus@iki.fi>
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> ---
>  .../devicetree/bindings/leds/ams,as3645a.txt       | 56 ++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/ams,as3645a.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/ams,as3645a.txt b/Documentation/devicetree/bindings/leds/ams,as3645a.txt
> new file mode 100644
> index 000000000000..00066e3f9036
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/ams,as3645a.txt
> @@ -0,0 +1,56 @@
> +Analog devices AS3645A device tree bindings
> +
> +The AS3645A flash LED controller can drive two LEDs, one high current
> +flash LED and one indicator LED. The high current flash LED can be
> +used in torch mode as well.
> +
> +Ranges below noted as [a, b] are closed ranges between a and b, i.e. a
> +and b are included in the range.
> +
> +
> +Required properties
> +===================
> +
> +compatible	: Must be "ams,as3645a".
> +reg		: The I2C address of the device. Typically 0x30.
> +
> +
> +Required properties of the "flash" child node
> +=============================================
> +
> +flash-timeout-us: Flash timeout in microseconds. The value must be in
> +		  the range [100000, 850000] and divisible by 50000.
> +flash-max-microamp: Maximum flash current in microamperes. Has to be
> +		    in the range between [200000, 500000] and
> +		    divisible by 20000.
> +led-max-microamp: Maximum torch (assist) current in microamperes. The
> +		  value must be in the range between [20000, 160000] and
> +		  divisible by 20000.
> +ams,input-max-microamp: Maximum flash controller input current. The
> +			value must be in the range [1250000, 2000000]
> +			and divisible by 50000.
> +
> +
> +Required properties of the "indicator" child node
> +=================================================
> +
> +led-max-microamp: Maximum indicator current. The allowed values are
> +		  2500, 5000, 7500 and 10000.

Most LED bindings mention also optional label property in the form:

- label : See Documentation/devicetree/bindings/leds/common.txt

> +
> +Example
> +=======
> +
> +	as3645a: flash@30 {
> +		reg = <0x30>;
> +		compatible = "ams,as3645a";
> +		flash {

			label = "as3645a:flash";

> +			flash-timeout-us = <150000>;
> +			flash-max-microamp = <320000>;
> +			led-max-microamp = <60000>;
> +			ams,input-max-microamp = <1750000>;
> +		};
> +		indicator {

			label = "as3645a:indicator";

> +			led-max-microamp = <10000>;
> +		};
> +	};
> 

-- 
Best regards,
Jacek Anaszewski

Re: [PATCH 1/3] dt: bindings: Document DT bindings for Analog devices as3645a

[Sakari Ailus]

Hi Jacek,

Thanks for the review.

On Wed, Aug 16, 2017 at 10:27:27PM +0200, Jacek Anaszewski wrote:
> Hi Sakari,
> 
> Thanks for the patch. One issue below.
> 
> On 08/16/2017 02:55 PM, Sakari Ailus wrote:
> > From: Sakari Ailus <sakari.ailus@iki.fi>
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > ---
> >  .../devicetree/bindings/leds/ams,as3645a.txt       | 56 ++++++++++++++++++++++
> >  1 file changed, 56 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/leds/ams,as3645a.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/ams,as3645a.txt b/Documentation/devicetree/bindings/leds/ams,as3645a.txt
> > new file mode 100644
> > index 000000000000..00066e3f9036
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/ams,as3645a.txt
> > @@ -0,0 +1,56 @@
> > +Analog devices AS3645A device tree bindings
> > +
> > +The AS3645A flash LED controller can drive two LEDs, one high current
> > +flash LED and one indicator LED. The high current flash LED can be
> > +used in torch mode as well.
> > +
> > +Ranges below noted as [a, b] are closed ranges between a and b, i.e. a
> > +and b are included in the range.
> > +
> > +
> > +Required properties
> > +===================
> > +
> > +compatible	: Must be "ams,as3645a".
> > +reg		: The I2C address of the device. Typically 0x30.
> > +
> > +
> > +Required properties of the "flash" child node
> > +=============================================
> > +
> > +flash-timeout-us: Flash timeout in microseconds. The value must be in
> > +		  the range [100000, 850000] and divisible by 50000.
> > +flash-max-microamp: Maximum flash current in microamperes. Has to be
> > +		    in the range between [200000, 500000] and
> > +		    divisible by 20000.
> > +led-max-microamp: Maximum torch (assist) current in microamperes. The
> > +		  value must be in the range between [20000, 160000] and
> > +		  divisible by 20000.
> > +ams,input-max-microamp: Maximum flash controller input current. The
> > +			value must be in the range [1250000, 2000000]
> > +			and divisible by 50000.
> > +
> > +
> > +Required properties of the "indicator" child node
> > +=================================================
> > +
> > +led-max-microamp: Maximum indicator current. The allowed values are
> > +		  2500, 5000, 7500 and 10000.
> 
> Most LED bindings mention also optional label property in the form:
> 
> - label : See Documentation/devicetree/bindings/leds/common.txt
> 
> > +
> > +Example
> > +=======
> > +
> > +	as3645a: flash@30 {
> > +		reg = <0x30>;
> > +		compatible = "ams,as3645a";
> > +		flash {
> 
> 			label = "as3645a:flash";
> 
> > +			flash-timeout-us = <150000>;
> > +			flash-max-microamp = <320000>;
> > +			led-max-microamp = <60000>;
> > +			ams,input-max-microamp = <1750000>;
> > +		};
> > +		indicator {
> 
> 			label = "as3645a:indicator";
> 
> > +			led-max-microamp = <10000>;
> > +		};
> > +	};
> > 

I'll make the above fixes for v2 (and add flash child node label property).

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi

Re: [PATCH 0/3] AS3645A flash support

[Jacek Anaszewski]

Hi Sakari,

On 08/16/2017 02:54 PM, Sakari Ailus wrote:
> Hi everyone,
> 
> This set adds support for the AS3645A flash driver which can be found e.g.
> in Nokia N9.
> 
> The set depeds on the flash patches here so I'd prefer to merge this
> through mediatree.
> 
> <URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=flash>
> 
> Jacek: would that be ok for you?

No problem.

> 
> Since the RFC set:
> 
> - Add back the DT binding documentation I lost long ago.
> 
> - Use colon (":") in the default names instead of a space.
> 
> Sakari Ailus (3):
>   dt: bindings: Document DT bindings for Analog devices as3645a
>   leds: as3645a: Add LED flash class driver
>   arm: dts: omap3: N9/N950: Add AS3645A camera flash
> 
>  .../devicetree/bindings/leds/ams,as3645a.txt       |  56 ++
>  MAINTAINERS                                        |   6 +
>  arch/arm/boot/dts/omap3-n9.dts                     |   1 +
>  arch/arm/boot/dts/omap3-n950-n9.dtsi               |  14 +
>  arch/arm/boot/dts/omap3-n950.dts                   |   1 +
>  drivers/leds/Kconfig                               |   8 +
>  drivers/leds/Makefile                              |   1 +
>  drivers/leds/leds-as3645a.c                        | 785 +++++++++++++++++++++
>  8 files changed, 872 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/ams,as3645a.txt
>  create mode 100644 drivers/leds/leds-as3645a.c
> 

-- 
Best regards,
Jacek Anaszewski