[linux-2.6-block.git] / drivers / leds / leds-aat1290.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *	LED Flash class driver for the AAT1290
 *	1.5A Step-Up Current Regulator for Flash LEDs
 *
 *	Copyright (C) 2015, Samsung Electronics Co., Ltd.
 *	Author: Jacek Anaszewski <j.anaszewski@samsung.com>
 */

#include <linux/delay.h>
#include <linux/gpio/consumer.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/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <media/v4l2-flash-led-class.h>

#define AAT1290_MOVIE_MODE_CURRENT_ADDR	17
#define AAT1290_MAX_MM_CURR_PERCENT_0	16
#define AAT1290_MAX_MM_CURR_PERCENT_100	1

#define AAT1290_FLASH_SAFETY_TIMER_ADDR	18

#define AAT1290_MOVIE_MODE_CONFIG_ADDR	19
#define AAT1290_MOVIE_MODE_OFF		1
#define AAT1290_MOVIE_MODE_ON		3

#define AAT1290_MM_CURRENT_RATIO_ADDR	20
#define AAT1290_MM_TO_FL_1_92		1

#define AAT1290_MM_TO_FL_RATIO		1000 / 1920
#define AAT1290_MAX_MM_CURRENT(fl_max)	(fl_max * AAT1290_MM_TO_FL_RATIO)

#define AAT1290_LATCH_TIME_MIN_US	500
#define AAT1290_LATCH_TIME_MAX_US	1000
#define AAT1290_EN_SET_TICK_TIME_US	1
#define AAT1290_FLEN_OFF_DELAY_TIME_US	10
#define AAT1290_FLASH_TM_NUM_LEVELS	16
#define AAT1290_MM_CURRENT_SCALE_SIZE	15


struct aat1290_led_config_data {
	/* maximum LED current in movie mode */
	u32 max_mm_current;
	/* maximum LED current in flash mode */
	u32 max_flash_current;
	/* maximum flash timeout */
	u32 max_flash_tm;
	/* external strobe capability */
	bool has_external_strobe;
	/* max LED brightness level */
	enum led_brightness max_brightness;
};

struct aat1290_led {
	/* platform device data */
	struct platform_device *pdev;
	/* secures access to the device */
	struct mutex lock;

	/* corresponding LED Flash class device */
	struct led_classdev_flash fled_cdev;
	/* V4L2 Flash device */
	struct v4l2_flash *v4l2_flash;

	/* FLEN pin */
	struct gpio_desc *gpio_fl_en;
	/* EN|SET pin  */
	struct gpio_desc *gpio_en_set;
	/* movie mode current scale */
	int *mm_current_scale;
	/* device mode */
	bool movie_mode;

	/* brightness cache */
	unsigned int torch_brightness;
};

static struct aat1290_led *fled_cdev_to_led(
				struct led_classdev_flash *fled_cdev)
{
	return container_of(fled_cdev, struct aat1290_led, fled_cdev);
}

static struct led_classdev_flash *led_cdev_to_fled_cdev(
				struct led_classdev *led_cdev)
{
	return container_of(led_cdev, struct led_classdev_flash, led_cdev);
}

static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value)
{
	int i;

	gpiod_direction_output(led->gpio_fl_en, 0);
	gpiod_direction_output(led->gpio_en_set, 0);

	udelay(AAT1290_FLEN_OFF_DELAY_TIME_US);

	/* write address */
	for (i = 0; i < addr; ++i) {
		udelay(AAT1290_EN_SET_TICK_TIME_US);
		gpiod_direction_output(led->gpio_en_set, 0);
		udelay(AAT1290_EN_SET_TICK_TIME_US);
		gpiod_direction_output(led->gpio_en_set, 1);
	}

	usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US);

	/* write data */
	for (i = 0; i < value; ++i) {
		udelay(AAT1290_EN_SET_TICK_TIME_US);
		gpiod_direction_output(led->gpio_en_set, 0);
		udelay(AAT1290_EN_SET_TICK_TIME_US);
		gpiod_direction_output(led->gpio_en_set, 1);
	}

	usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US);
}

static void aat1290_set_flash_safety_timer(struct aat1290_led *led,
					unsigned int micro_sec)
{
	struct led_classdev_flash *fled_cdev = &led->fled_cdev;
	struct led_flash_setting *flash_tm = &fled_cdev->timeout;
	int flash_tm_reg = AAT1290_FLASH_TM_NUM_LEVELS -
				(micro_sec / flash_tm->step) + 1;

	aat1290_as2cwire_write(led, AAT1290_FLASH_SAFETY_TIMER_ADDR,
							flash_tm_reg);
}

/* LED subsystem callbacks */

static int aat1290_led_brightness_set(struct led_classdev *led_cdev,
					enum led_brightness brightness)
{
	struct led_classdev_flash *fled_cdev = led_cdev_to_fled_cdev(led_cdev);
	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);

	mutex_lock(&led->lock);

	if (brightness == 0) {
		gpiod_direction_output(led->gpio_fl_en, 0);
		gpiod_direction_output(led->gpio_en_set, 0);
		led->movie_mode = false;
	} else {
		if (!led->movie_mode) {
			aat1290_as2cwire_write(led,
				AAT1290_MM_CURRENT_RATIO_ADDR,
				AAT1290_MM_TO_FL_1_92);
			led->movie_mode = true;
		}

		aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CURRENT_ADDR,
				AAT1290_MAX_MM_CURR_PERCENT_0 - brightness);
		aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CONFIG_ADDR,
				AAT1290_MOVIE_MODE_ON);
	}

	mutex_unlock(&led->lock);

	return 0;
}

static int aat1290_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
					 bool state)

{
	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
	struct led_flash_setting *timeout = &fled_cdev->timeout;

	mutex_lock(&led->lock);

	if (state) {
		aat1290_set_flash_safety_timer(led, timeout->val);
		gpiod_direction_output(led->gpio_fl_en, 1);
	} else {
		gpiod_direction_output(led->gpio_fl_en, 0);
		gpiod_direction_output(led->gpio_en_set, 0);
	}

	/*
	 * To reenter movie mode after a flash event the part must be cycled
	 * off and back on to reset the movie mode and reprogrammed via the
	 * AS2Cwire. Therefore the brightness and movie_mode properties needs
	 * to be updated here to reflect the actual state.
	 */
	led_cdev->brightness = 0;
	led->movie_mode = false;

	mutex_unlock(&led->lock);

	return 0;
}

static int aat1290_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
						u32 timeout)
{
	/*
	 * Don't do anything - flash timeout is cached in the led-class-flash
	 * core and will be applied in the strobe_set op, as writing the
	 * safety timer register spuriously turns the torch mode on.
	 */

	return 0;
}

static int aat1290_led_parse_dt(struct aat1290_led *led,
			struct aat1290_led_config_data *cfg,
			struct device_node **sub_node)
{
	struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
	struct device *dev = &led->pdev->dev;
	struct device_node *child_node;
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	struct pinctrl *pinctrl;
#endif
	int ret = 0;

	led->gpio_fl_en = devm_gpiod_get(dev, "flen", GPIOD_ASIS);
	if (IS_ERR(led->gpio_fl_en)) {
		ret = PTR_ERR(led->gpio_fl_en);
		dev_err(dev, "Unable to claim gpio \"flen\".\n");
		return ret;
	}

	led->gpio_en_set = devm_gpiod_get(dev, "enset", GPIOD_ASIS);
	if (IS_ERR(led->gpio_en_set)) {
		ret = PTR_ERR(led->gpio_en_set);
		dev_err(dev, "Unable to claim gpio \"enset\".\n");
		return ret;
	}

#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);
	if (IS_ERR(pinctrl)) {
		cfg->has_external_strobe = false;
		dev_info(dev,
			 "No support for external strobe detected.\n");
	} else {
		cfg->has_external_strobe = true;
	}
#endif

	child_node = of_get_next_available_child(dev->of_node, NULL);
	if (!child_node) {
		dev_err(dev, "No DT child node found for connected LED.\n");
		return -EINVAL;
	}

	led_cdev->name = of_get_property(child_node, "label", NULL) ? :
						child_node->name;

	ret = of_property_read_u32(child_node, "led-max-microamp",
				&cfg->max_mm_current);
	/*
	 * led-max-microamp will default to 1/20 of flash-max-microamp
	 * in case it is missing.
	 */
	if (ret < 0)
		dev_warn(dev,
			"led-max-microamp DT property missing\n");

	ret = of_property_read_u32(child_node, "flash-max-microamp",
				&cfg->max_flash_current);
	if (ret < 0) {
		dev_err(dev,
			"flash-max-microamp DT property missing\n");
		goto err_parse_dt;
	}

	ret = of_property_read_u32(child_node, "flash-max-timeout-us",
				&cfg->max_flash_tm);
	if (ret < 0) {
		dev_err(dev,
			"flash-max-timeout-us DT property missing\n");
		goto err_parse_dt;
	}

	*sub_node = child_node;

err_parse_dt:
	of_node_put(child_node);

	return ret;
}

static void aat1290_led_validate_mm_current(struct aat1290_led *led,
					struct aat1290_led_config_data *cfg)
{
	int i, b = 0, e = AAT1290_MM_CURRENT_SCALE_SIZE;

	while (e - b > 1) {
		i = b + (e - b) / 2;
		if (cfg->max_mm_current < led->mm_current_scale[i])
			e = i;
		else
			b = i;
	}

	cfg->max_mm_current = led->mm_current_scale[b];
	cfg->max_brightness = b + 1;
}

static int init_mm_current_scale(struct aat1290_led *led,
			struct aat1290_led_config_data *cfg)
{
	static const int max_mm_current_percent[] = {
		20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
		63, 71, 79, 89, 100
	};
	int i, max_mm_current =
			AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);

	led->mm_current_scale = devm_kzalloc(&led->pdev->dev,
					sizeof(max_mm_current_percent),
					GFP_KERNEL);
	if (!led->mm_current_scale)
		return -ENOMEM;

	for (i = 0; i < AAT1290_MM_CURRENT_SCALE_SIZE; ++i)
		led->mm_current_scale[i] = max_mm_current *
					  max_mm_current_percent[i] / 100;

	return 0;
}

static int aat1290_led_get_configuration(struct aat1290_led *led,
					struct aat1290_led_config_data *cfg,
					struct device_node **sub_node)
{
	int ret;

	ret = aat1290_led_parse_dt(led, cfg, sub_node);
	if (ret < 0)
		return ret;
	/*
	 * Init non-linear movie mode current scale basing
	 * on the max flash current from led configuration.
	 */
	ret = init_mm_current_scale(led, cfg);
	if (ret < 0)
		return ret;

	aat1290_led_validate_mm_current(led, cfg);

#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
#else
	devm_kfree(&led->pdev->dev, led->mm_current_scale);
#endif

	return 0;
}

static void aat1290_init_flash_timeout(struct aat1290_led *led,
				struct aat1290_led_config_data *cfg)
{
	struct led_classdev_flash *fled_cdev = &led->fled_cdev;
	struct led_flash_setting *setting;

	/* Init flash timeout setting */
	setting = &fled_cdev->timeout;
	setting->min = cfg->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS;
	setting->max = cfg->max_flash_tm;
	setting->step = setting->min;
	setting->val = setting->max;
}

#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
static enum led_brightness aat1290_intensity_to_brightness(
					struct v4l2_flash *v4l2_flash,
					s32 intensity)
{
	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
	int i;

	for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)
		if (intensity >= led->mm_current_scale[i])
			return i + 1;

	return 1;
}

static s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash,
					enum led_brightness brightness)
{
	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);

	return led->mm_current_scale[brightness - 1];
}

static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash,
						bool enable)
{
	struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);
	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
	struct pinctrl *pinctrl;

	gpiod_direction_output(led->gpio_fl_en, 0);
	gpiod_direction_output(led->gpio_en_set, 0);

	led->movie_mode = false;
	led_cdev->brightness = 0;

	pinctrl = devm_pinctrl_get_select(&led->pdev->dev,
						enable ? "isp" : "host");
	if (IS_ERR(pinctrl)) {
		dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n");
		return PTR_ERR(pinctrl);
	}

	return 0;
}

static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
					struct aat1290_led_config_data *led_cfg,
					struct v4l2_flash_config *v4l2_sd_cfg)
{
	struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
	struct led_flash_setting *s;

	strlcpy(v4l2_sd_cfg->dev_name, led_cdev->name,
		sizeof(v4l2_sd_cfg->dev_name));

	s = &v4l2_sd_cfg->intensity;
	s->min = led->mm_current_scale[0];
	s->max = led_cfg->max_mm_current;
	s->step = 1;
	s->val = s->max;

	v4l2_sd_cfg->has_external_strobe = led_cfg->has_external_strobe;
}

static const struct v4l2_flash_ops v4l2_flash_ops = {
	.external_strobe_set = aat1290_led_external_strobe_set,
	.intensity_to_led_brightness = aat1290_intensity_to_brightness,
	.led_brightness_to_intensity = aat1290_brightness_to_intensity,
};
#else
static inline void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
				struct aat1290_led_config_data *led_cfg,
				struct v4l2_flash_config *v4l2_sd_cfg)
{
}
static const struct v4l2_flash_ops v4l2_flash_ops;
#endif

static const struct led_flash_ops flash_ops = {
	.strobe_set = aat1290_led_flash_strobe_set,
	.timeout_set = aat1290_led_flash_timeout_set,
};

static int aat1290_led_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *sub_node = NULL;
	struct aat1290_led *led;
	struct led_classdev *led_cdev;
	struct led_classdev_flash *fled_cdev;
	struct aat1290_led_config_data led_cfg = {};
	struct v4l2_flash_config v4l2_sd_cfg = {};
	int ret;

	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	led->pdev = pdev;
	platform_set_drvdata(pdev, led);

	fled_cdev = &led->fled_cdev;
	fled_cdev->ops = &flash_ops;
	led_cdev = &fled_cdev->led_cdev;

	ret = aat1290_led_get_configuration(led, &led_cfg, &sub_node);
	if (ret < 0)
		return ret;

	mutex_init(&led->lock);

	/* Initialize LED Flash class device */
	led_cdev->brightness_set_blocking = aat1290_led_brightness_set;
	led_cdev->max_brightness = led_cfg.max_brightness;
	led_cdev->flags |= LED_DEV_CAP_FLASH;

	aat1290_init_flash_timeout(led, &led_cfg);

	/* Register LED Flash class device */
	ret = led_classdev_flash_register(&pdev->dev, fled_cdev);
	if (ret < 0)
		goto err_flash_register;

	aat1290_init_v4l2_flash_config(led, &led_cfg, &v4l2_sd_cfg);

	/* Create V4L2 Flash subdev. */
	led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
					  fled_cdev, &v4l2_flash_ops,
					  &v4l2_sd_cfg);
	if (IS_ERR(led->v4l2_flash)) {
		ret = PTR_ERR(led->v4l2_flash);
		goto error_v4l2_flash_init;
	}

	return 0;

error_v4l2_flash_init:
	led_classdev_flash_unregister(fled_cdev);
err_flash_register:
	mutex_destroy(&led->lock);

	return ret;
}

static int aat1290_led_remove(struct platform_device *pdev)
{
	struct aat1290_led *led = platform_get_drvdata(pdev);

	v4l2_flash_release(led->v4l2_flash);
	led_classdev_flash_unregister(&led->fled_cdev);

	mutex_destroy(&led->lock);

	return 0;
}

static const struct of_device_id aat1290_led_dt_match[] = {
	{ .compatible = "skyworks,aat1290" },
	{},
};
MODULE_DEVICE_TABLE(of, aat1290_led_dt_match);

static struct platform_driver aat1290_led_driver = {
	.probe		= aat1290_led_probe,
	.remove		= aat1290_led_remove,
	.driver		= {
		.name	= "aat1290",
		.of_match_table = aat1290_led_dt_match,
	},
};

module_platform_driver(aat1290_led_driver);

MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
MODULE_DESCRIPTION("Skyworks Current Regulator for Flash LEDs");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
49c34b8e JA	2	/*
	3	* LED Flash class driver for the AAT1290
	4	* 1.5A Step-Up Current Regulator for Flash LEDs
	5	*
	6	* Copyright (C) 2015, Samsung Electronics Co., Ltd.
	7	* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
49c34b8e JA	8	*/
	9
	10	#include <linux/delay.h>
	11	#include <linux/gpio/consumer.h>
	12	#include <linux/led-class-flash.h>
	13	#include <linux/leds.h>
	14	#include <linux/module.h>
	15	#include <linux/mutex.h>
	16	#include <linux/of.h>
ac69b903	17	#include <linux/pinctrl/consumer.h>
49c34b8e JA	18	#include <linux/platform_device.h>
49c34b8e JA	19	#include <linux/slab.h>
ac69b903	20	#include <media/v4l2-flash-led-class.h>
49c34b8e JA	21
	22	#define AAT1290_MOVIE_MODE_CURRENT_ADDR 17
	23	#define AAT1290_MAX_MM_CURR_PERCENT_0 16
	24	#define AAT1290_MAX_MM_CURR_PERCENT_100 1
	25
	26	#define AAT1290_FLASH_SAFETY_TIMER_ADDR 18
	27
	28	#define AAT1290_MOVIE_MODE_CONFIG_ADDR 19
	29	#define AAT1290_MOVIE_MODE_OFF 1
	30	#define AAT1290_MOVIE_MODE_ON 3
	31
	32	#define AAT1290_MM_CURRENT_RATIO_ADDR 20
	33	#define AAT1290_MM_TO_FL_1_92 1
	34
	35	#define AAT1290_MM_TO_FL_RATIO 1000 / 1920
	36	#define AAT1290_MAX_MM_CURRENT(fl_max) (fl_max * AAT1290_MM_TO_FL_RATIO)
	37
	38	#define AAT1290_LATCH_TIME_MIN_US 500
	39	#define AAT1290_LATCH_TIME_MAX_US 1000
	40	#define AAT1290_EN_SET_TICK_TIME_US 1
	41	#define AAT1290_FLEN_OFF_DELAY_TIME_US 10
	42	#define AAT1290_FLASH_TM_NUM_LEVELS 16
	43	#define AAT1290_MM_CURRENT_SCALE_SIZE 15
	44
	45
	46	struct aat1290_led_config_data {
	47	/* maximum LED current in movie mode */
	48	u32 max_mm_current;
	49	/* maximum LED current in flash mode */
	50	u32 max_flash_current;
	51	/* maximum flash timeout */
	52	u32 max_flash_tm;
ac69b903 JA	53	/* external strobe capability */
ac69b903 JA	54	bool has_external_strobe;
49c34b8e JA	55	/* max LED brightness level */
	56	enum led_brightness max_brightness;
	57	};
	58
	59	struct aat1290_led {
	60	/* platform device data */
	61	struct platform_device *pdev;
	62	/* secures access to the device */
	63	struct mutex lock;
	64
	65	/* corresponding LED Flash class device */
	66	struct led_classdev_flash fled_cdev;
ac69b903 JA	67	/* V4L2 Flash device */
ac69b903 JA	68	struct v4l2_flash *v4l2_flash;
49c34b8e JA	69
	70	/* FLEN pin */
	71	struct gpio_desc *gpio_fl_en;
	72	/* EN\|SET pin */
	73	struct gpio_desc *gpio_en_set;
	74	/* movie mode current scale */
	75	int *mm_current_scale;
	76	/* device mode */
	77	bool movie_mode;
	78
	79	/* brightness cache */
	80	unsigned int torch_brightness;
49c34b8e JA	81	};
	82
	83	static struct aat1290_led *fled_cdev_to_led(
	84	struct led_classdev_flash *fled_cdev)
	85	{
	86	return container_of(fled_cdev, struct aat1290_led, fled_cdev);
	87	}
	88
269e92da JA	89	static struct led_classdev_flash *led_cdev_to_fled_cdev(
	90	struct led_classdev *led_cdev)
	91	{
	92	return container_of(led_cdev, struct led_classdev_flash, led_cdev);
	93	}
	94
49c34b8e JA	95	static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value)
	96	{
	97	int i;
	98
	99	gpiod_direction_output(led->gpio_fl_en, 0);
	100	gpiod_direction_output(led->gpio_en_set, 0);
	101
	102	udelay(AAT1290_FLEN_OFF_DELAY_TIME_US);
	103
	104	/* write address */
	105	for (i = 0; i < addr; ++i) {
	106	udelay(AAT1290_EN_SET_TICK_TIME_US);
	107	gpiod_direction_output(led->gpio_en_set, 0);
	108	udelay(AAT1290_EN_SET_TICK_TIME_US);
	109	gpiod_direction_output(led->gpio_en_set, 1);
	110	}
	111
	112	usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US);
	113
	114	/* write data */
	115	for (i = 0; i < value; ++i) {
	116	udelay(AAT1290_EN_SET_TICK_TIME_US);
	117	gpiod_direction_output(led->gpio_en_set, 0);
	118	udelay(AAT1290_EN_SET_TICK_TIME_US);
	119	gpiod_direction_output(led->gpio_en_set, 1);
	120	}
	121
	122	usleep_range(AAT1290_LATCH_TIME_MIN_US, AAT1290_LATCH_TIME_MAX_US);
	123	}
	124
	125	static void aat1290_set_flash_safety_timer(struct aat1290_led *led,
	126	unsigned int micro_sec)
	127	{
	128	struct led_classdev_flash *fled_cdev = &led->fled_cdev;
	129	struct led_flash_setting *flash_tm = &fled_cdev->timeout;
	130	int flash_tm_reg = AAT1290_FLASH_TM_NUM_LEVELS -
	131	(micro_sec / flash_tm->step) + 1;
	132
	133	aat1290_as2cwire_write(led, AAT1290_FLASH_SAFETY_TIMER_ADDR,
	134	flash_tm_reg);
	135	}
	136
269e92da JA	137	/* LED subsystem callbacks */
	138
	139	static int aat1290_led_brightness_set(struct led_classdev *led_cdev,
49c34b8e JA	140	enum led_brightness brightness)
49c34b8e JA	141	{
269e92da JA	142	struct led_classdev_flash *fled_cdev = led_cdev_to_fled_cdev(led_cdev);
	143	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
	144
49c34b8e JA	145	mutex_lock(&led->lock);
	146
	147	if (brightness == 0) {
	148	gpiod_direction_output(led->gpio_fl_en, 0);
	149	gpiod_direction_output(led->gpio_en_set, 0);
	150	led->movie_mode = false;
	151	} else {
	152	if (!led->movie_mode) {
	153	aat1290_as2cwire_write(led,
	154	AAT1290_MM_CURRENT_RATIO_ADDR,
	155	AAT1290_MM_TO_FL_1_92);
	156	led->movie_mode = true;
	157	}
	158
	159	aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CURRENT_ADDR,
	160	AAT1290_MAX_MM_CURR_PERCENT_0 - brightness);
	161	aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CONFIG_ADDR,
	162	AAT1290_MOVIE_MODE_ON);
	163	}
	164
	165	mutex_unlock(&led->lock);
49c34b8e JA	166
	167	return 0;
	168	}
	169
	170	static int aat1290_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
	171	bool state)
	172
	173	{
	174	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
	175	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
	176	struct led_flash_setting *timeout = &fled_cdev->timeout;
	177
	178	mutex_lock(&led->lock);
	179
	180	if (state) {
	181	aat1290_set_flash_safety_timer(led, timeout->val);
	182	gpiod_direction_output(led->gpio_fl_en, 1);
	183	} else {
	184	gpiod_direction_output(led->gpio_fl_en, 0);
	185	gpiod_direction_output(led->gpio_en_set, 0);
	186	}
	187
	188	/*
	189	* To reenter movie mode after a flash event the part must be cycled
	190	* off and back on to reset the movie mode and reprogrammed via the
	191	* AS2Cwire. Therefore the brightness and movie_mode properties needs
	192	* to be updated here to reflect the actual state.
	193	*/
	194	led_cdev->brightness = 0;
	195	led->movie_mode = false;
	196
	197	mutex_unlock(&led->lock);
	198
	199	return 0;
	200	}
	201
	202	static int aat1290_led_flash_timeout_set(struct led_classdev_flash *fled_cdev,
	203	u32 timeout)
	204	{
	205	/*
	206	* Don't do anything - flash timeout is cached in the led-class-flash
	207	* core and will be applied in the strobe_set op, as writing the
	208	* safety timer register spuriously turns the torch mode on.
	209	*/
	210
	211	return 0;
	212	}
	213
	214	static int aat1290_led_parse_dt(struct aat1290_led *led,
ac69b903 JA	215	struct aat1290_led_config_data *cfg,
ac69b903 JA	216	struct device_node **sub_node)
49c34b8e JA	217	{
	218	struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
	219	struct device *dev = &led->pdev->dev;
	220	struct device_node *child_node;
ac69b903 JA	221	#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	222	struct pinctrl *pinctrl;
	223	#endif
49c34b8e JA	224	int ret = 0;
49c34b8e JA	225
8a687719	226	led->gpio_fl_en = devm_gpiod_get(dev, "flen", GPIOD_ASIS);
49c34b8e JA	227	if (IS_ERR(led->gpio_fl_en)) {
	228	ret = PTR_ERR(led->gpio_fl_en);
	229	dev_err(dev, "Unable to claim gpio \"flen\".\n");
	230	return ret;
	231	}
	232
8a687719	233	led->gpio_en_set = devm_gpiod_get(dev, "enset", GPIOD_ASIS);
49c34b8e JA	234	if (IS_ERR(led->gpio_en_set)) {
	235	ret = PTR_ERR(led->gpio_en_set);
	236	dev_err(dev, "Unable to claim gpio \"enset\".\n");
	237	return ret;
	238	}
	239
ac69b903 JA	240	#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	241	pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);
	242	if (IS_ERR(pinctrl)) {
	243	cfg->has_external_strobe = false;
	244	dev_info(dev,
	245	"No support for external strobe detected.\n");
	246	} else {
	247	cfg->has_external_strobe = true;
	248	}
	249	#endif
	250
49c34b8e JA	251	child_node = of_get_next_available_child(dev->of_node, NULL);
	252	if (!child_node) {
	253	dev_err(dev, "No DT child node found for connected LED.\n");
	254	return -EINVAL;
	255	}
	256
	257	led_cdev->name = of_get_property(child_node, "label", NULL) ? :
	258	child_node->name;
	259
	260	ret = of_property_read_u32(child_node, "led-max-microamp",
	261	&cfg->max_mm_current);
	262	/*
	263	* led-max-microamp will default to 1/20 of flash-max-microamp
	264	* in case it is missing.
	265	*/
	266	if (ret < 0)
	267	dev_warn(dev,
	268	"led-max-microamp DT property missing\n");
	269
	270	ret = of_property_read_u32(child_node, "flash-max-microamp",
	271	&cfg->max_flash_current);
	272	if (ret < 0) {
	273	dev_err(dev,
	274	"flash-max-microamp DT property missing\n");
0c24199c	275	goto err_parse_dt;
49c34b8e JA	276	}
	277
	278	ret = of_property_read_u32(child_node, "flash-max-timeout-us",
	279	&cfg->max_flash_tm);
	280	if (ret < 0) {
	281	dev_err(dev,
	282	"flash-max-timeout-us DT property missing\n");
0c24199c	283	goto err_parse_dt;
49c34b8e JA	284	}
49c34b8e JA	285
ac69b903 JA	286	*sub_node = child_node;
ac69b903 JA	287
0c24199c JA	288	err_parse_dt:
	289	of_node_put(child_node);
	290
49c34b8e JA	291	return ret;
	292	}
	293
	294	static void aat1290_led_validate_mm_current(struct aat1290_led *led,
	295	struct aat1290_led_config_data *cfg)
	296	{
	297	int i, b = 0, e = AAT1290_MM_CURRENT_SCALE_SIZE;
	298
	299	while (e - b > 1) {
	300	i = b + (e - b) / 2;
	301	if (cfg->max_mm_current < led->mm_current_scale[i])
	302	e = i;
	303	else
	304	b = i;
	305	}
	306
	307	cfg->max_mm_current = led->mm_current_scale[b];
	308	cfg->max_brightness = b + 1;
	309	}
	310
305c324f	311	static int init_mm_current_scale(struct aat1290_led *led,
49c34b8e JA	312	struct aat1290_led_config_data *cfg)
49c34b8e JA	313	{
17224244 CIK	314	static const int max_mm_current_percent[] = {
	315	20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
	316	63, 71, 79, 89, 100
	317	};
49c34b8e JA	318	int i, max_mm_current =
	319	AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);
	320
ac69b903 JA	321	led->mm_current_scale = devm_kzalloc(&led->pdev->dev,
ac69b903 JA	322	sizeof(max_mm_current_percent),
49c34b8e JA	323	GFP_KERNEL);
	324	if (!led->mm_current_scale)
	325	return -ENOMEM;
	326
	327	for (i = 0; i < AAT1290_MM_CURRENT_SCALE_SIZE; ++i)
	328	led->mm_current_scale[i] = max_mm_current *
	329	max_mm_current_percent[i] / 100;
	330
	331	return 0;
	332	}
	333
	334	static int aat1290_led_get_configuration(struct aat1290_led *led,
ac69b903 JA	335	struct aat1290_led_config_data *cfg,
ac69b903 JA	336	struct device_node **sub_node)
49c34b8e JA	337	{
	338	int ret;
	339
ac69b903	340	ret = aat1290_led_parse_dt(led, cfg, sub_node);
49c34b8e JA	341	if (ret < 0)
	342	return ret;
	343	/*
	344	* Init non-linear movie mode current scale basing
	345	* on the max flash current from led configuration.
	346	*/
	347	ret = init_mm_current_scale(led, cfg);
	348	if (ret < 0)
	349	return ret;
	350
	351	aat1290_led_validate_mm_current(led, cfg);
	352
ac69b903 JA	353	#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	354	#else
	355	devm_kfree(&led->pdev->dev, led->mm_current_scale);
	356	#endif
49c34b8e JA	357
	358	return 0;
	359	}
	360
	361	static void aat1290_init_flash_timeout(struct aat1290_led *led,
	362	struct aat1290_led_config_data *cfg)
	363	{
	364	struct led_classdev_flash *fled_cdev = &led->fled_cdev;
	365	struct led_flash_setting *setting;
	366
	367	/* Init flash timeout setting */
	368	setting = &fled_cdev->timeout;
	369	setting->min = cfg->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS;
	370	setting->max = cfg->max_flash_tm;
	371	setting->step = setting->min;
	372	setting->val = setting->max;
	373	}
	374
ac69b903 JA	375	#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
	376	static enum led_brightness aat1290_intensity_to_brightness(
	377	struct v4l2_flash *v4l2_flash,
	378	s32 intensity)
	379	{
	380	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
	381	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
	382	int i;
	383
	384	for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)
	385	if (intensity >= led->mm_current_scale[i])
	386	return i + 1;
	387
	388	return 1;
	389	}
	390
	391	static s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash,
	392	enum led_brightness brightness)
	393	{
	394	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
	395	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
	396
	397	return led->mm_current_scale[brightness - 1];
	398	}
	399
	400	static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash,
	401	bool enable)
	402	{
	403	struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);
	404	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
	405	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
	406	struct pinctrl *pinctrl;
	407
	408	gpiod_direction_output(led->gpio_fl_en, 0);
	409	gpiod_direction_output(led->gpio_en_set, 0);
	410
	411	led->movie_mode = false;
	412	led_cdev->brightness = 0;
	413
	414	pinctrl = devm_pinctrl_get_select(&led->pdev->dev,
	415	enable ? "isp" : "host");
	416	if (IS_ERR(pinctrl)) {
	417	dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n");
	418	return PTR_ERR(pinctrl);
	419	}
	420
	421	return 0;
	422	}
	423
	424	static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
	425	struct aat1290_led_config_data *led_cfg,
	426	struct v4l2_flash_config *v4l2_sd_cfg)
	427	{
	428	struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;
	429	struct led_flash_setting *s;
	430
	431	strlcpy(v4l2_sd_cfg->dev_name, led_cdev->name,
	432	sizeof(v4l2_sd_cfg->dev_name));
	433
503dd28a	434	s = &v4l2_sd_cfg->intensity;
ac69b903 JA	435	s->min = led->mm_current_scale[0];
	436	s->max = led_cfg->max_mm_current;
	437	s->step = 1;
	438	s->val = s->max;
	439
	440	v4l2_sd_cfg->has_external_strobe = led_cfg->has_external_strobe;
	441	}
	442
	443	static const struct v4l2_flash_ops v4l2_flash_ops = {
	444	.external_strobe_set = aat1290_led_external_strobe_set,
	445	.intensity_to_led_brightness = aat1290_intensity_to_brightness,
	446	.led_brightness_to_intensity = aat1290_brightness_to_intensity,
	447	};
	448	#else
	449	static inline void aat1290_init_v4l2_flash_config(struct aat1290_led *led,
	450	struct aat1290_led_config_data *led_cfg,
	451	struct v4l2_flash_config *v4l2_sd_cfg)
	452	{
	453	}
	454	static const struct v4l2_flash_ops v4l2_flash_ops;
	455	#endif
	456
49c34b8e JA	457	static const struct led_flash_ops flash_ops = {
	458	.strobe_set = aat1290_led_flash_strobe_set,
	459	.timeout_set = aat1290_led_flash_timeout_set,
	460	};
	461
	462	static int aat1290_led_probe(struct platform_device *pdev)
	463	{
	464	struct device *dev = &pdev->dev;
ac69b903	465	struct device_node *sub_node = NULL;
49c34b8e JA	466	struct aat1290_led *led;
	467	struct led_classdev *led_cdev;
	468	struct led_classdev_flash *fled_cdev;
	469	struct aat1290_led_config_data led_cfg = {};
ac69b903	470	struct v4l2_flash_config v4l2_sd_cfg = {};
49c34b8e JA	471	int ret;
	472
	473	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
	474	if (!led)
	475	return -ENOMEM;
	476
	477	led->pdev = pdev;
	478	platform_set_drvdata(pdev, led);
	479
	480	fled_cdev = &led->fled_cdev;
	481	fled_cdev->ops = &flash_ops;
	482	led_cdev = &fled_cdev->led_cdev;
	483
ac69b903	484	ret = aat1290_led_get_configuration(led, &led_cfg, &sub_node);
49c34b8e JA	485	if (ret < 0)
	486	return ret;
	487
	488	mutex_init(&led->lock);
	489
	490	/* Initialize LED Flash class device */
269e92da	491	led_cdev->brightness_set_blocking = aat1290_led_brightness_set;
49c34b8e JA	492	led_cdev->max_brightness = led_cfg.max_brightness;
49c34b8e JA	493	led_cdev->flags \|= LED_DEV_CAP_FLASH;
49c34b8e JA	494
	495	aat1290_init_flash_timeout(led, &led_cfg);
	496
	497	/* Register LED Flash class device */
	498	ret = led_classdev_flash_register(&pdev->dev, fled_cdev);
	499	if (ret < 0)
	500	goto err_flash_register;
	501
ac69b903 JA	502	aat1290_init_v4l2_flash_config(led, &led_cfg, &v4l2_sd_cfg);
	503
	504	/* Create V4L2 Flash subdev. */
048ea05b	505	led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),
503dd28a	506	fled_cdev, &v4l2_flash_ops,
048ea05b	507	&v4l2_sd_cfg);
ac69b903 JA	508	if (IS_ERR(led->v4l2_flash)) {
	509	ret = PTR_ERR(led->v4l2_flash);
	510	goto error_v4l2_flash_init;
	511	}
	512
49c34b8e JA	513	return 0;
49c34b8e JA	514
ac69b903 JA	515	error_v4l2_flash_init:
ac69b903 JA	516	led_classdev_flash_unregister(fled_cdev);
49c34b8e JA	517	err_flash_register:
	518	mutex_destroy(&led->lock);
	519
	520	return ret;
	521	}
	522
	523	static int aat1290_led_remove(struct platform_device *pdev)
	524	{
	525	struct aat1290_led *led = platform_get_drvdata(pdev);
	526
ac69b903	527	v4l2_flash_release(led->v4l2_flash);
49c34b8e	528	led_classdev_flash_unregister(&led->fled_cdev);
49c34b8e JA	529
	530	mutex_destroy(&led->lock);
	531
	532	return 0;
	533	}
	534
	535	static const struct of_device_id aat1290_led_dt_match[] = {
	536	{ .compatible = "skyworks,aat1290" },
	537	{},
	538	};
93a51aa4	539	MODULE_DEVICE_TABLE(of, aat1290_led_dt_match);
49c34b8e JA	540
	541	static struct platform_driver aat1290_led_driver = {
	542	.probe = aat1290_led_probe,
	543	.remove = aat1290_led_remove,
	544	.driver = {
	545	.name = "aat1290",
	546	.of_match_table = aat1290_led_dt_match,
	547	},
	548	};
	549
	550	module_platform_driver(aat1290_led_driver);
	551
	552	MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
	553	MODULE_DESCRIPTION("Skyworks Current Regulator for Flash LEDs");
	554	MODULE_LICENSE("GPL v2");