[PATCH v7 0/3] Add ktd2692 Flash LED driver using LED Flash class

[PATCH v7 0/3] Add ktd2692 Flash LED driver using LED Flash class

[Ingi Kim]

This patch adds ktd2692 Flash LED driver with LED Flash class

Change in v7:
	- Add flash-max-microamp property for Flash LED
	- Change gpio-legacy interface to gpio consumer interface

Change in v6 resend:
	- Adjust indent using checkpatch.pl script with strict option

Change in v6:
	- Change goto label to if-else
	- Change DT binding style for LED device binding

Change in v5:
	- Clean up the code
	- Fix help message of Kconfig
	- Fix issue related with regulator and mutex usage
	- Remove tab spaces in bindings

Change in v4:
	- Clean up the code
	- Modify binding documentation of ktd2692

Change in v3:
	- Clean up the code
	- Add aux gpio pin to control Flash LED

Change in v2:
	- Introduction of LED Flash class as Jacek's comment
	- Supplement of binding documentation
	- Rename gpio control pin and remove unused pin
	- Add regulator for the Flash LED

Ingi Kim (3):
  of: Add vendor prefix for Kinetic technologies
  leds: ktd2692: add device tree bindings for ktd2692
  leds: Add ktd2692 flash LED driver

 .../devicetree/bindings/leds/leds-ktd2692.txt      |  47 +++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 drivers/leds/Kconfig                               |   9 +
 drivers/leds/Makefile                              |   1 +
 drivers/leds/leds-ktd2692.c                        | 435 +++++++++++++++++++++
 5 files changed, 493 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-ktd2692.txt
 create mode 100644 drivers/leds/leds-ktd2692.c

-- 
2.0.5

[PATCH v7 1/3] of: Add vendor prefix for Kinetic technologies

[Ingi Kim]

This patch adds vendor prefix for Kinetic technologies

Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index fae26d0..90a4be1 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -100,6 +100,7 @@ isee	ISEE 2007 S.L.
 isil	Intersil
 karo	Ka-Ro electronics GmbH
 keymile	Keymile GmbH
+kinetic Kinetic Technologies
 lacie	LaCie
 lantiq	Lantiq Semiconductor
 lenovo	Lenovo Group Ltd.
-- 
2.0.5

[PATCH v7 2/3] leds: ktd2692: add device tree bindings for ktd2692

[Ingi Kim]

This patch adds the device tree bindings for ktd2692 flash LEDs.
Add Optional properties of child node for Flash LED

Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---
 .../devicetree/bindings/leds/leds-ktd2692.txt      | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-ktd2692.txt

diff --git a/Documentation/devicetree/bindings/leds/leds-ktd2692.txt b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
new file mode 100644
index 0000000..708f2d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
@@ -0,0 +1,47 @@
+* Kinetic Technologies - KTD2692 Flash LED Driver
+
+KTD2692 is the ideal power solution for high-power flash LEDs.
+It uses ExpressWire single-wire programming for maximum flexibility.
+
+The ExpressWire interface through CTRL pin can control LED on/off and
+enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode current,
+Flash timeout, LVP(low voltage protection).
+
+Also, When the AUX pin is pulled high while CTRL pin is high,
+LED current will be ramped up to the flash-mode current level.
+
+Required properties:
+- compatible: "kinetic,ktd2692"
+- ctrl-gpio : gpio pin in order control CTRL pin
+- aux-gpio : gpio pin in order control AUX pin
+
+Optional properties:
+- vin-supply : "vin" LED supply (2.7V to 5.5V)
+  See Documentation/devicetree/bindings/regulator/regulator.txt
+
+A discrete LED element connected to the device must be represented by a child
+node - see Documentation/devicetree/bindings/leds/common.txt.
+
+Required properties for flash LED child nodes:
+  See Documentation/devicetree/bindings/leds/common.txt
+- flash-max-microamp : Flash LED maximum current
+  Formula : I(mA) = 15000 / Rset
+- flash-max-timeout-us : Flash LED maximum timeout
+
+Optional properties for flash LED child nodes:
+- label : see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+ktd2692 {
+	compatible = "kinetic,ktd2692";
+	ctrl-gpio = <&gpc0 1 0>;
+	aux-gpio = <&gpc0 2 0>;
+	vin-supply = <&vbat>;
+
+	flash-led {
+		label = "ktd2692-flash";
+		flash-max-microamp = <1500000>;
+		flash-max-timeout-us = <1835000>;
+	};
+};
-- 
2.0.5

[PATCH v7 3/3] leds: Add ktd2692 flash LED driver

[Ingi Kim]

This patch adds a driver to support the ktd2692 flash LEDs.
ktd2692 can control flash current by ExpressWire interface.

Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---
 drivers/leds/Kconfig        |   9 +
 drivers/leds/Makefile       |   1 +
 drivers/leds/leds-ktd2692.c | 435 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 445 insertions(+)
 create mode 100644 drivers/leds/leds-ktd2692.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 51059bb..bfbdbd1 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -505,6 +505,15 @@ config LEDS_MENF21BMC
 	  This driver can also be built as a module. If so the module
 	  will be called leds-menf21bmc.
 
+config LEDS_KTD2692
+	tristate "KTD2692 LED flash support"
+	depends on LEDS_CLASS_FLASH && GPIOLIB && OF
+	help
+	  This option enables support for KTD2692 LED flash connected
+	  through ExpressWire interface.
+
+	  Say Y to enable this driver.
+
 comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
 
 config LEDS_BLINKM
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index a739ae2..ed5ed79 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o
 obj-$(CONFIG_LEDS_SYSCON)		+= leds-syscon.o
 obj-$(CONFIG_LEDS_VERSATILE)		+= leds-versatile.o
 obj-$(CONFIG_LEDS_MENF21BMC)		+= leds-menf21bmc.o
+obj-$(CONFIG_LEDS_KTD2692)		+= leds-ktd2692.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o
diff --git a/drivers/leds/leds-ktd2692.c b/drivers/leds/leds-ktd2692.c
new file mode 100644
index 0000000..cec5264
--- /dev/null
+++ b/drivers/leds/leds-ktd2692.c
@@ -0,0 +1,435 @@
+/*
+ * LED driver : leds-ktd2692.c
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Ingi Kim <ingi2.kim@samsung.com>
+ *
+ * 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.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/workqueue.h>
+
+/* Value related the movie mode */
+#define KTD2692_MOVIE_MODE_CURRENT_MAX_MA	300000
+#define KTD2692_MOVIE_MODE_CURRENT_LEVELS	16
+#define KTD2692_MM_TO_FL_RATIO			(1 / 3)
+#define KTD2962_MM_MIN_CURR_THRESHOLD_SCALE	8
+
+/* Value related the flash mode */
+#define KTD2692_FLASH_MODE_TIMEOUT_LEVELS	8
+#define KTD2692_FLASH_MODE_TIMEOUT_DISABLE	0
+#define KTD2692_FLASH_MODE_CURR_PERCENT(x)	(((x) * 16) / 100)
+
+/* Macro for getting offset of flash timeout */
+#define GET_TIMEOUT_OFFSET(timeout, step)	((timeout) / (step))
+
+/* Base register address */
+#define KTD2692_REG_LVP_BASE			0x00
+#define KTD2692_REG_FLASH_TIMEOUT_BASE		0x20
+#define KTD2692_REG_MM_MIN_CURR_THRESHOLD_BASE	0x40
+#define KTD2692_REG_MOVIE_CURRENT_BASE		0x60
+#define KTD2692_REG_FLASH_CURRENT_BASE		0x80
+#define KTD2692_REG_MODE_BASE			0xA0
+
+/* Set bit coding time for expresswire interface */
+#define KTD2692_TIME_RESET_US			700
+#define KTD2692_TIME_DATA_START_TIME_US		10
+#define KTD2692_TIME_HIGH_END_OF_DATA_US	350
+#define KTD2692_TIME_LOW_END_OF_DATA_US		10
+#define KTD2692_TIME_SHORT_BITSET_US		4
+#define KTD2692_TIME_LONG_BITSET_US		12
+
+/* KTD2692 default length of name */
+#define KTD2692_NAME_LENGTH			20
+
+enum ktd2692_bitset {
+	KTD2692_LOW = 0,
+	KTD2692_HIGH,
+};
+
+/* Movie / Flash Mode Control */
+enum ktd2692_led_mode {
+	KTD2692_MODE_DISABLE = 0,	/* default */
+	KTD2692_MODE_MOVIE,
+	KTD2692_MODE_FLASH,
+};
+
+struct ktd2692_led_config_data {
+	/* maximum LED current in flash mode */
+	u32 flash_max_microamp;
+	/* maximum flash timeout */
+	u32 flash_max_timeout;
+	/* max LED brightness level */
+	enum led_brightness max_brightness;
+};
+
+struct ktd2692_context {
+	/* Related LED Flash class device */
+	struct led_classdev_flash fled_cdev;
+
+	/* secures access to the device */
+	struct mutex lock;
+	struct regulator *regulator;
+	struct work_struct work_brightness_set;
+
+	struct gpio_desc *aux_gpio;
+	struct gpio_desc *ctrl_gpio;
+
+	enum ktd2692_led_mode mode;
+	enum led_brightness torch_brightness;
+};
+
+static struct ktd2692_context *fled_cdev_to_led(
+				struct led_classdev_flash *fled_cdev)
+{
+	return container_of(fled_cdev, struct ktd2692_context, fled_cdev);
+}
+
+static void ktd2692_expresswire_start(struct ktd2692_context *led)
+{
+	gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
+	udelay(KTD2692_TIME_DATA_START_TIME_US);
+}
+
+static void ktd2692_expresswire_reset(struct ktd2692_context *led)
+{
+	gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+	udelay(KTD2692_TIME_RESET_US);
+}
+
+static void ktd2692_expresswire_end(struct ktd2692_context *led)
+{
+	gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+	udelay(KTD2692_TIME_LOW_END_OF_DATA_US);
+	gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
+	udelay(KTD2692_TIME_HIGH_END_OF_DATA_US);
+}
+
+static void ktd2692_expresswire_set_bit(struct ktd2692_context *led, bool bit)
+{
+	/*
+	 * The Low Bit(0) and High Bit(1) is based on a time detection
+	 * algorithm between time low and time high
+	 * Time_(L_LB) : Low time of the Low Bit(0)
+	 * Time_(H_LB) : High time of the LOW Bit(0)
+	 * Time_(L_HB) : Low time of the High Bit(1)
+	 * Time_(H_HB) : High time of the High Bit(1)
+	 *
+	 * It can be simplified to:
+	 * Low Bit(0) : 2 * Time_(H_LB) < Time_(L_LB)
+	 * High Bit(1) : 2 * Time_(L_HB) < Time_(H_HB)
+	 * HIGH  ___           ____    _..     _________    ___
+	 *          |_________|    |_..  |____|         |__|
+	 * LOW        <L_LB>  <H_LB>     <L_HB>  <H_HB>
+	 *          [  Low Bit (0) ]     [  High Bit(1) ]
+	 */
+	if (bit) {
+		gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+		udelay(KTD2692_TIME_SHORT_BITSET_US);
+		gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
+		udelay(KTD2692_TIME_LONG_BITSET_US);
+	} else {
+		gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
+		udelay(KTD2692_TIME_LONG_BITSET_US);
+		gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
+		udelay(KTD2692_TIME_SHORT_BITSET_US);
+	}
+}
+
+static void ktd2692_expresswire_write(struct ktd2692_context *led, u8 value)
+{
+	int i;
+
+	ktd2692_expresswire_start(led);
+	for (i = 7; i >= 0; i--)
+		ktd2692_expresswire_set_bit(led, value & BIT(i));
+	ktd2692_expresswire_end(led);
+}
+
+static void ktd2692_brightness_set(struct ktd2692_context *led,
+				   enum led_brightness brightness)
+{
+	mutex_lock(&led->lock);
+
+	if (brightness == LED_OFF) {
+		led->mode = KTD2692_MODE_DISABLE;
+		gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+	} else {
+		ktd2692_expresswire_write(led, brightness |
+					KTD2692_REG_MOVIE_CURRENT_BASE);
+		led->mode = KTD2692_MODE_MOVIE;
+	}
+
+	ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
+	mutex_unlock(&led->lock);
+}
+
+static void ktd2692_brightness_set_work(struct work_struct *work)
+{
+	struct ktd2692_context *led =
+		container_of(work, struct ktd2692_context, work_brightness_set);
+
+	ktd2692_brightness_set(led, led->torch_brightness);
+}
+
+static void ktd2692_led_brightness_set(struct led_classdev *led_cdev,
+				       enum led_brightness brightness)
+{
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	struct ktd2692_context *led = fled_cdev_to_led(fled_cdev);
+
+	led->torch_brightness = brightness;
+	schedule_work(&led->work_brightness_set);
+}
+
+static int ktd2692_led_brightness_set_sync(struct led_classdev *led_cdev,
+					   enum led_brightness brightness)
+{
+	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
+	struct ktd2692_context *led = fled_cdev_to_led(fled_cdev);
+
+	ktd2692_brightness_set(led, brightness);
+
+	return 0;
+}
+
+static int ktd2692_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
+					bool state)
+{
+	struct ktd2692_context *led = fled_cdev_to_led(fled_cdev);
+	struct led_flash_setting *timeout = &fled_cdev->timeout;
+	u32 flash_tm_reg;
+
+	mutex_lock(&led->lock);
+
+	if (state == 0) {
+		led->mode = KTD2692_MODE_DISABLE;
+		gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+	} else {
+		flash_tm_reg = GET_TIMEOUT_OFFSET(timeout->val, timeout->step);
+		ktd2692_expresswire_write(led, flash_tm_reg
+				| KTD2692_REG_FLASH_TIMEOUT_BASE);
+
+		led->mode = KTD2692_MODE_FLASH;
+		gpiod_direction_output(led->aux_gpio, KTD2692_HIGH);
+	}
+
+	ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
+
+	fled_cdev->led_cdev.brightness = LED_OFF;
+	led->mode = KTD2692_MODE_DISABLE;
+
+	mutex_unlock(&led->lock);
+
+	return 0;
+}
+
+static int ktd2692_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
+					 u32 timeout)
+{
+	return 0;
+}
+
+static void ktd2692_init_movie_current_max(struct ktd2692_led_config_data *cfg)
+{
+	u32 offset, step;
+	u32 movie_current_microamp;
+
+	offset = KTD2692_MOVIE_MODE_CURRENT_LEVELS;
+	step = (cfg->flash_max_microamp / KTD2692_MM_TO_FL_RATIO)
+		/ KTD2692_MOVIE_MODE_CURRENT_LEVELS;
+
+	do {
+		movie_current_microamp = step * offset;
+		offset--;
+	} while ((movie_current_microamp > KTD2692_MOVIE_MODE_CURRENT_MAX_MA) &&
+		(offset > 0));
+
+	cfg->max_brightness = offset;
+}
+
+static void ktd2692_init_flash_timeout(struct led_classdev_flash *fled_cdev,
+				       struct ktd2692_led_config_data *cfg)
+{
+	struct led_flash_setting *setting;
+
+	setting = &fled_cdev->timeout;
+	setting->min = KTD2692_FLASH_MODE_TIMEOUT_DISABLE;
+	setting->max = cfg->flash_max_timeout;
+	setting->step = cfg->flash_max_timeout
+			/ (KTD2692_FLASH_MODE_TIMEOUT_LEVELS - 1);
+	setting->val = cfg->flash_max_timeout;
+}
+
+static void ktd2692_setup(struct ktd2692_context *led)
+{
+	led->mode = KTD2692_MODE_DISABLE;
+	ktd2692_expresswire_reset(led);
+	gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+
+	ktd2692_expresswire_write(led, (KTD2962_MM_MIN_CURR_THRESHOLD_SCALE - 1)
+				 | KTD2692_REG_MM_MIN_CURR_THRESHOLD_BASE);
+	ktd2692_expresswire_write(led, KTD2692_FLASH_MODE_CURR_PERCENT(45)
+				 | KTD2692_REG_FLASH_CURRENT_BASE);
+}
+
+static int ktd2692_parse_dt(struct ktd2692_context *led, struct device *dev,
+			    struct ktd2692_led_config_data *cfg)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *child_node;
+	int ret;
+
+	if (!dev->of_node)
+		return -ENXIO;
+
+	led->ctrl_gpio = devm_gpiod_get(dev, "ctrl");
+	if (IS_ERR(led->ctrl_gpio)) {
+		ret = PTR_ERR(led->ctrl_gpio);
+		dev_err(dev, "cannot get ctrl-gpio %d\n", ret);
+		return ret;
+	}
+
+	led->aux_gpio = devm_gpiod_get(dev, "aux");
+	if (IS_ERR(led->aux_gpio)) {
+		ret = PTR_ERR(led->aux_gpio);
+		dev_err(dev, "cannot get aux-gpio %d\n", ret);
+		return ret;
+	}
+
+	led->regulator = devm_regulator_get(dev, "vin");
+	if (IS_ERR(led->regulator))
+		led->regulator = NULL;
+
+	if (led->regulator) {
+		ret = regulator_enable(led->regulator);
+		if (ret)
+			dev_err(dev, "Failed to enable supply: %d\n", ret);
+	}
+
+	child_node = of_get_next_available_child(np, NULL);
+	if (!child_node) {
+		dev_err(dev, "No DT child node found for connected LED.\n");
+		return -EINVAL;
+	}
+
+	led->fled_cdev.led_cdev.name =
+		of_get_property(child_node, "label", NULL) ? : child_node->name;
+
+	ret = of_property_read_u32(child_node, "flash-max-microamp",
+				   &cfg->flash_max_microamp);
+	if (ret) {
+		dev_err(dev, "failed to parse flash-max-microamp\n");
+		return ret;
+	}
+
+	ret = of_property_read_u32(child_node, "flash-max-timeout-us",
+				   &cfg->flash_max_timeout);
+	if (ret)
+		dev_err(dev, "failed to parse flash-max-timeout-us\n");
+
+	of_node_put(child_node);
+	return ret;
+}
+
+static const struct led_flash_ops flash_ops = {
+	.strobe_set = ktd2692_led_flash_strobe_set,
+	.timeout_set = ktd2692_led_flash_timeout_set,
+};
+
+static int ktd2692_probe(struct platform_device *pdev)
+{
+	struct ktd2692_context *led;
+	struct led_classdev *led_cdev;
+	struct led_classdev_flash *fled_cdev;
+	struct ktd2692_led_config_data led_cfg;
+	int ret;
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	fled_cdev = &led->fled_cdev;
+	led_cdev = &fled_cdev->led_cdev;
+
+	ret = ktd2692_parse_dt(led, &pdev->dev, &led_cfg);
+	if (ret)
+		return ret;
+
+	ktd2692_init_flash_timeout(fled_cdev, &led_cfg);
+	ktd2692_init_movie_current_max(&led_cfg);
+
+	fled_cdev->ops = &flash_ops;
+
+	led_cdev->max_brightness = led_cfg.max_brightness;
+	led_cdev->brightness_set = ktd2692_led_brightness_set;
+	led_cdev->brightness_set_sync = ktd2692_led_brightness_set_sync;
+	led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;
+
+	mutex_init(&led->lock);
+	INIT_WORK(&led->work_brightness_set, ktd2692_brightness_set_work);
+
+	platform_set_drvdata(pdev, led);
+
+	ret = led_classdev_flash_register(&pdev->dev, fled_cdev);
+	if (ret) {
+		dev_err(&pdev->dev, "can't register LED %s\n", led_cdev->name);
+		mutex_destroy(&led->lock);
+		return ret;
+	}
+
+	ktd2692_setup(led);
+
+	return 0;
+}
+
+static int ktd2692_remove(struct platform_device *pdev)
+{
+	struct ktd2692_context *led = platform_get_drvdata(pdev);
+	int ret;
+
+	led_classdev_flash_unregister(&led->fled_cdev);
+	cancel_work_sync(&led->work_brightness_set);
+
+	if (led->regulator) {
+		ret = regulator_disable(led->regulator);
+		if (ret)
+			dev_err(&pdev->dev,
+				"Failed to disable supply: %d\n", ret);
+	}
+
+	mutex_destroy(&led->lock);
+
+	return 0;
+}
+
+static const struct of_device_id ktd2692_match[] = {
+	{ .compatible = "kinetic,ktd2692", },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver ktd2692_driver = {
+	.driver = {
+		.name  = "ktd2692",
+		.of_match_table = ktd2692_match,
+	},
+	.probe  = ktd2692_probe,
+	.remove = ktd2692_remove,
+};
+
+module_platform_driver(ktd2692_driver);
+
+MODULE_AUTHOR("Ingi Kim <ingi2.kim@samsung.com>");
+MODULE_DESCRIPTION("Kinetic KTD2692 LED driver");
+MODULE_LICENSE("GPL v2");
-- 
2.0.5

Re: [PATCH v7 0/3] Add ktd2692 Flash LED driver using LED Flash class

[Varka Bhadram]

On 04/23/2015 06:48 PM, Ingi Kim wrote:
> This patch adds ktd2692 Flash LED driver with LED Flash class
>
> Change in v7:
> 	- Add flash-max-microamp property for Flash LED
> 	- Change gpio-legacy interface to gpio consumer interface
>
> Change in v6 resend:
> 	- Adjust indent using checkpatch.pl script with strict option
>
> Change in v6:
> 	- Change goto label to if-else
> 	- Change DT binding style for LED device binding
>
> Change in v5:
> 	- Clean up the code
> 	- Fix help message of Kconfig
> 	- Fix issue related with regulator and mutex usage
> 	- Remove tab spaces in bindings
>
> Change in v4:
> 	- Clean up the code
> 	- Modify binding documentation of ktd2692
>
> Change in v3:
> 	- Clean up the code
> 	- Add aux gpio pin to control Flash LED
>
> Change in v2:
> 	- Introduction of LED Flash class as Jacek's comment
> 	- Supplement of binding documentation
> 	- Rename gpio control pin and remove unused pin
> 	- Add regulator for the Flash LED
>
> Ingi Kim (3):
>   of: Add vendor prefix for Kinetic technologies
>   leds: ktd2692: add device tree bindings for ktd2692
>   leds: Add ktd2692 flash LED driver
>
>  .../devicetree/bindings/leds/leds-ktd2692.txt      |  47 +++
>  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
>  drivers/leds/Kconfig                               |   9 +
>  drivers/leds/Makefile                              |   1 +
>  drivers/leds/leds-ktd2692.c                        | 435 +++++++++++++++++++++
>  5 files changed, 493 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-ktd2692.txt
>  create mode 100644 drivers/leds/leds-ktd2692.c
>
Reviewed-by: Varka Bhadram <varkabhadram@gmail.com>

Thanks

-- 
Varka Bhadram

Re: [PATCH v7 2/3] leds: ktd2692: add device tree bindings for ktd2692

[Jacek Anaszewski]

On Thu, 23 Apr 2015 22:18:04 +0900
Hi Ingi,

Ingi Kim <ingi2.kim@samsung.com> wrote:

> This patch adds the device tree bindings for ktd2692 flash LEDs.
> Add Optional properties of child node for Flash LED
> 
> Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
> Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com>
> ---
>  .../devicetree/bindings/leds/leds-ktd2692.txt      | 47
> ++++++++++++++++++++++ 1 file changed, 47 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt new file
> mode 100644 index 0000000..708f2d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> @@ -0,0 +1,47 @@
> +* Kinetic Technologies - KTD2692 Flash LED Driver
> +
> +KTD2692 is the ideal power solution for high-power flash LEDs.
> +It uses ExpressWire single-wire programming for maximum flexibility.
> +
> +The ExpressWire interface through CTRL pin can control LED on/off and
> +enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode
> current, +Flash timeout, LVP(low voltage protection).
> +
> +Also, When the AUX pin is pulled high while CTRL pin is high,
> +LED current will be ramped up to the flash-mode current level.
> +
> +Required properties:
> +- compatible: "kinetic,ktd2692"
> +- ctrl-gpio : gpio pin in order control CTRL pin
> +- aux-gpio : gpio pin in order control AUX pin
> +
> +Optional properties:
> +- vin-supply : "vin" LED supply (2.7V to 5.5V)
> +  See Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +A discrete LED element connected to the device must be represented
> by a child +node - see
> Documentation/devicetree/bindings/leds/common.txt. +
> +Required properties for flash LED child nodes:
> +  See Documentation/devicetree/bindings/leds/common.txt
> +- flash-max-microamp : Flash LED maximum current
> +  Formula : I(mA) = 15000 / Rset
> +- flash-max-timeout-us : Flash LED maximum timeout

Patch [1] makes the led-max-microamp property mandatory for
the LEDs with configurable current for non-flash modes.

It hasn't been merged yet as we are waiting for ack from DT maintainer.


> +
> +Optional properties for flash LED child nodes:
> +- label : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +ktd2692 {
> +	compatible = "kinetic,ktd2692";
> +	ctrl-gpio = <&gpc0 1 0>;
> +	aux-gpio = <&gpc0 2 0>;
> +	vin-supply = <&vbat>;
> +
> +	flash-led {
> +		label = "ktd2692-flash";
> +		flash-max-microamp = <1500000>;
> +		flash-max-timeout-us = <1835000>;
> +	};
> +};

[1] [PATCH v6] DT: leds: Improve description of flash LEDs related
properties

-- 
Best Regards,
Jacek Anaszewski

Re: [PATCH v7 2/3] leds: ktd2692: add device tree bindings for ktd2692

[Ingi Kim]

Hi Jacek,

Thanks for the review.


On 2015년 04월 24일 22:29, Jacek Anaszewski wrote:
> On Thu, 23 Apr 2015 22:18:04 +0900
> Hi Ingi,
> 
> Ingi Kim <ingi2.kim@samsung.com> wrote:
> 
>> This patch adds the device tree bindings for ktd2692 flash LEDs.
>> Add Optional properties of child node for Flash LED
>>
>> Signed-off-by: Ingi Kim <ingi2.kim@samsung.com>
>> Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com>
>> ---
>>  .../devicetree/bindings/leds/leds-ktd2692.txt      | 47
>> ++++++++++++++++++++++ 1 file changed, 47 insertions(+)
>>  create mode 100644
>> Documentation/devicetree/bindings/leds/leds-ktd2692.txt
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
>> b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt new file
>> mode 100644 index 0000000..708f2d4
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
>> @@ -0,0 +1,47 @@
>> +* Kinetic Technologies - KTD2692 Flash LED Driver
>> +
>> +KTD2692 is the ideal power solution for high-power flash LEDs.
>> +It uses ExpressWire single-wire programming for maximum flexibility.
>> +
>> +The ExpressWire interface through CTRL pin can control LED on/off and
>> +enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode
>> current, +Flash timeout, LVP(low voltage protection).
>> +
>> +Also, When the AUX pin is pulled high while CTRL pin is high,
>> +LED current will be ramped up to the flash-mode current level.
>> +
>> +Required properties:
>> +- compatible: "kinetic,ktd2692"
>> +- ctrl-gpio : gpio pin in order control CTRL pin
>> +- aux-gpio : gpio pin in order control AUX pin
>> +
>> +Optional properties:
>> +- vin-supply : "vin" LED supply (2.7V to 5.5V)
>> +  See Documentation/devicetree/bindings/regulator/regulator.txt
>> +
>> +A discrete LED element connected to the device must be represented
>> by a child +node - see
>> Documentation/devicetree/bindings/leds/common.txt. +
>> +Required properties for flash LED child nodes:
>> +  See Documentation/devicetree/bindings/leds/common.txt
>> +- flash-max-microamp : Flash LED maximum current
>> +  Formula : I(mA) = 15000 / Rset
>> +- flash-max-timeout-us : Flash LED maximum timeout
> 
> Patch [1] makes the led-max-microamp property mandatory for
> the LEDs with configurable current for non-flash modes.
> 
> It hasn't been merged yet as we are waiting for ack from DT maintainer.
> 
> 

Ok, I'll add it.

I saw discussion about introduction of new properties for Flash LED,
I also hope that patch[1] would be merged as soon as possible :)

>> +
>> +Optional properties for flash LED child nodes:
>> +- label : see Documentation/devicetree/bindings/leds/common.txt
>> +
>> +Example:
>> +
>> +ktd2692 {
>> +	compatible = "kinetic,ktd2692";
>> +	ctrl-gpio = <&gpc0 1 0>;
>> +	aux-gpio = <&gpc0 2 0>;
>> +	vin-supply = <&vbat>;
>> +
>> +	flash-led {
>> +		label = "ktd2692-flash";
>> +		flash-max-microamp = <1500000>;
>> +		flash-max-timeout-us = <1835000>;
>> +	};
>> +};
> 
> [1] [PATCH v6] DT: leds: Improve description of flash LEDs related
> properties
>