[linux-2.6-block.git] / drivers / leds / flash / leds-sgm3140.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 Luca Weiss <luca@z3ntu.xyz>

#include <linux/gpio/consumer.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/platform_device.h>

#include <media/v4l2-flash-led-class.h>

#define FLASH_TIMEOUT_DEFAULT		250000U /* 250ms */
#define FLASH_MAX_TIMEOUT_DEFAULT	300000U /* 300ms */

struct sgm3140 {
	struct led_classdev_flash fled_cdev;
	struct v4l2_flash *v4l2_flash;

	struct timer_list powerdown_timer;

	struct gpio_desc *flash_gpio;
	struct gpio_desc *enable_gpio;
	struct regulator *vin_regulator;

	bool enabled;

	/* current timeout in us */
	u32 timeout;
	/* maximum timeout in us */
	u32 max_timeout;
};

static struct sgm3140 *flcdev_to_sgm3140(struct led_classdev_flash *flcdev)
{
	return container_of(flcdev, struct sgm3140, fled_cdev);
}

static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
{
	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
	int ret;

	if (priv->enabled == state)
		return 0;

	if (state) {
		ret = regulator_enable(priv->vin_regulator);
		if (ret) {
			dev_err(fled_cdev->led_cdev.dev,
				"failed to enable regulator: %d\n", ret);
			return ret;
		}
		gpiod_set_value_cansleep(priv->flash_gpio, 1);
		gpiod_set_value_cansleep(priv->enable_gpio, 1);
		mod_timer(&priv->powerdown_timer,
			  jiffies + usecs_to_jiffies(priv->timeout));
	} else {
		del_timer_sync(&priv->powerdown_timer);
		gpiod_set_value_cansleep(priv->enable_gpio, 0);
		gpiod_set_value_cansleep(priv->flash_gpio, 0);
		ret = regulator_disable(priv->vin_regulator);
		if (ret) {
			dev_err(fled_cdev->led_cdev.dev,
				"failed to disable regulator: %d\n", ret);
			return ret;
		}
	}

	priv->enabled = state;

	return 0;
}

static int sgm3140_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
{
	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);

	*state = timer_pending(&priv->powerdown_timer);

	return 0;
}

static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev,
			       u32 timeout)
{
	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);

	priv->timeout = timeout;

	return 0;
}

static const struct led_flash_ops sgm3140_flash_ops = {
	.strobe_set = sgm3140_strobe_set,
	.strobe_get = sgm3140_strobe_get,
	.timeout_set = sgm3140_timeout_set,
};

static int sgm3140_brightness_set(struct led_classdev *led_cdev,
				  enum led_brightness brightness)
{
	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
	bool enable = brightness == LED_ON;
	int ret;

	if (priv->enabled == enable)
		return 0;

	if (enable) {
		ret = regulator_enable(priv->vin_regulator);
		if (ret) {
			dev_err(led_cdev->dev,
				"failed to enable regulator: %d\n", ret);
			return ret;
		}
		gpiod_set_value_cansleep(priv->enable_gpio, 1);
	} else {
		gpiod_set_value_cansleep(priv->enable_gpio, 0);
		ret = regulator_disable(priv->vin_regulator);
		if (ret) {
			dev_err(led_cdev->dev,
				"failed to disable regulator: %d\n", ret);
			return ret;
		}
	}

	priv->enabled = enable;

	return 0;
}

static void sgm3140_powerdown_timer(struct timer_list *t)
{
	struct sgm3140 *priv = from_timer(priv, t, powerdown_timer);

	gpiod_set_value(priv->enable_gpio, 0);
	gpiod_set_value(priv->flash_gpio, 0);
	regulator_disable(priv->vin_regulator);

	priv->enabled = false;
}

static void sgm3140_init_flash_timeout(struct sgm3140 *priv)
{
	struct led_classdev_flash *fled_cdev = &priv->fled_cdev;
	struct led_flash_setting *s;

	/* Init flash timeout setting */
	s = &fled_cdev->timeout;
	s->min = 1;
	s->max = priv->max_timeout;
	s->step = 1;
	s->val = FLASH_TIMEOUT_DEFAULT;
}

#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
					struct v4l2_flash_config *v4l2_sd_cfg)
{
	struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev;
	struct led_flash_setting *s;

	strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,
		sizeof(v4l2_sd_cfg->dev_name));

	/* Init flash intensity setting */
	s = &v4l2_sd_cfg->intensity;
	s->min = 0;
	s->max = 1;
	s->step = 1;
	s->val = 1;
}

#else
static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
					struct v4l2_flash_config *v4l2_sd_cfg)
{
}
#endif

static int sgm3140_probe(struct platform_device *pdev)
{
	struct sgm3140 *priv;
	struct led_classdev *led_cdev;
	struct led_classdev_flash *fled_cdev;
	struct led_init_data init_data = {};
	struct fwnode_handle *child_node;
	struct v4l2_flash_config v4l2_sd_cfg = {};
	int ret;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW);
	ret = PTR_ERR_OR_ZERO(priv->flash_gpio);
	if (ret)
		return dev_err_probe(&pdev->dev, ret,
				     "Failed to request flash gpio\n");

	priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
	ret = PTR_ERR_OR_ZERO(priv->enable_gpio);
	if (ret)
		return dev_err_probe(&pdev->dev, ret,
				     "Failed to request enable gpio\n");

	priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin");
	ret = PTR_ERR_OR_ZERO(priv->vin_regulator);
	if (ret)
		return dev_err_probe(&pdev->dev, ret,
				     "Failed to request regulator\n");

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

	ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us",
				       &priv->max_timeout);
	if (ret) {
		priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT;
		dev_warn(&pdev->dev,
			 "flash-max-timeout-us property missing\n");
	}

	/*
	 * Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout
	 * from DT is lower.
	 */
	priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT);

	timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0);

	fled_cdev = &priv->fled_cdev;
	led_cdev = &fled_cdev->led_cdev;

	fled_cdev->ops = &sgm3140_flash_ops;

	led_cdev->brightness_set_blocking = sgm3140_brightness_set;
	led_cdev->max_brightness = LED_ON;
	led_cdev->flags |= LED_DEV_CAP_FLASH;

	sgm3140_init_flash_timeout(priv);

	init_data.fwnode = child_node;

	platform_set_drvdata(pdev, priv);

	/* Register in the LED subsystem */
	ret = devm_led_classdev_flash_register_ext(&pdev->dev,
						   fled_cdev, &init_data);
	if (ret) {
		dev_err(&pdev->dev, "Failed to register flash device: %d\n",
			ret);
		goto err;
	}

	sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg);

	/* Create V4L2 Flash subdev */
	priv->v4l2_flash = v4l2_flash_init(&pdev->dev,
					   child_node,
					   fled_cdev, NULL,
					   &v4l2_sd_cfg);
	if (IS_ERR(priv->v4l2_flash)) {
		ret = PTR_ERR(priv->v4l2_flash);
		goto err;
	}

	return ret;

err:
	fwnode_handle_put(child_node);
	return ret;
}

static int sgm3140_remove(struct platform_device *pdev)
{
	struct sgm3140 *priv = platform_get_drvdata(pdev);

	del_timer_sync(&priv->powerdown_timer);

	v4l2_flash_release(priv->v4l2_flash);

	return 0;
}

static const struct of_device_id sgm3140_dt_match[] = {
	{ .compatible = "ocs,ocp8110" },
	{ .compatible = "richtek,rt5033-led" },
	{ .compatible = "sgmicro,sgm3140" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sgm3140_dt_match);

static struct platform_driver sgm3140_driver = {
	.probe	= sgm3140_probe,
	.remove	= sgm3140_remove,
	.driver	= {
		.name	= "sgm3140",
		.of_match_table = sgm3140_dt_match,
	},
};

module_platform_driver(sgm3140_driver);

MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xyz>");
MODULE_DESCRIPTION("SG Micro SGM3140 charge pump LED driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
cef8ec8c LW	1	// SPDX-License-Identifier: GPL-2.0
	2	// Copyright (C) 2020 Luca Weiss <luca@z3ntu.xyz>
	3
	4	#include <linux/gpio/consumer.h>
	5	#include <linux/led-class-flash.h>
	6	#include <linux/module.h>
	7	#include <linux/regulator/consumer.h>
	8	#include <linux/platform_device.h>
	9
	10	#include <media/v4l2-flash-led-class.h>
	11
	12	#define FLASH_TIMEOUT_DEFAULT 250000U /* 250ms */
	13	#define FLASH_MAX_TIMEOUT_DEFAULT 300000U /* 300ms */
	14
	15	struct sgm3140 {
	16	struct led_classdev_flash fled_cdev;
	17	struct v4l2_flash *v4l2_flash;
	18
	19	struct timer_list powerdown_timer;
	20
	21	struct gpio_desc *flash_gpio;
	22	struct gpio_desc *enable_gpio;
	23	struct regulator *vin_regulator;
	24
	25	bool enabled;
	26
	27	/* current timeout in us */
	28	u32 timeout;
	29	/* maximum timeout in us */
	30	u32 max_timeout;
	31	};
	32
	33	static struct sgm3140 flcdev_to_sgm3140(struct led_classdev_flash flcdev)
	34	{
	35	return container_of(flcdev, struct sgm3140, fled_cdev);
	36	}
	37
	38	static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
	39	{
	40	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
	41	int ret;
	42
	43	if (priv->enabled == state)
	44	return 0;
	45
	46	if (state) {
	47	ret = regulator_enable(priv->vin_regulator);
	48	if (ret) {
	49	dev_err(fled_cdev->led_cdev.dev,
	50	"failed to enable regulator: %d\n", ret);
	51	return ret;
	52	}
	53	gpiod_set_value_cansleep(priv->flash_gpio, 1);
	54	gpiod_set_value_cansleep(priv->enable_gpio, 1);
	55	mod_timer(&priv->powerdown_timer,
	56	jiffies + usecs_to_jiffies(priv->timeout));
	57	} else {
	58	del_timer_sync(&priv->powerdown_timer);
	59	gpiod_set_value_cansleep(priv->enable_gpio, 0);
	60	gpiod_set_value_cansleep(priv->flash_gpio, 0);
	61	ret = regulator_disable(priv->vin_regulator);
	62	if (ret) {
	63	dev_err(fled_cdev->led_cdev.dev,
	64	"failed to disable regulator: %d\n", ret);
65	return ret;
66	}
67	}
68
69	priv->enabled = state;
70
71	return 0;
72	}
73
74	static int sgm3140_strobe_get(struct led_classdev_flash fled_cdev, bool state)
75	{
76	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
77
78	*state = timer_pending(&priv->powerdown_timer);
79
80	return 0;
81	}
82
83	static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev,
84	u32 timeout)
85	{
86	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
87
88	priv->timeout = timeout;
89
90	return 0;
91	}
92
93	static const struct led_flash_ops sgm3140_flash_ops = {
94	.strobe_set = sgm3140_strobe_set,
95	.strobe_get = sgm3140_strobe_get,
96	.timeout_set = sgm3140_timeout_set,
97	};
98
99	static int sgm3140_brightness_set(struct led_classdev *led_cdev,
100	enum led_brightness brightness)
101	{
102	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
103	struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
104	bool enable = brightness == LED_ON;
105	int ret;
106
107	if (priv->enabled == enable)
108	return 0;
109
110	if (enable) {
111	ret = regulator_enable(priv->vin_regulator);
112	if (ret) {
113	dev_err(led_cdev->dev,
114	"failed to enable regulator: %d\n", ret);
115	return ret;
116	}
117	gpiod_set_value_cansleep(priv->enable_gpio, 1);
118	} else {
119	gpiod_set_value_cansleep(priv->enable_gpio, 0);
120	ret = regulator_disable(priv->vin_regulator);
121	if (ret) {
122	dev_err(led_cdev->dev,
123	"failed to disable regulator: %d\n", ret);
124	return ret;
125	}
126	}
127
128	priv->enabled = enable;
129
130	return 0;
131	}
132
133	static void sgm3140_powerdown_timer(struct timer_list *t)
134	{
135	struct sgm3140 *priv = from_timer(priv, t, powerdown_timer);
136
137	gpiod_set_value(priv->enable_gpio, 0);
138	gpiod_set_value(priv->flash_gpio, 0);
139	regulator_disable(priv->vin_regulator);
140
141	priv->enabled = false;
142	}
143
144	static void sgm3140_init_flash_timeout(struct sgm3140 *priv)
145	{
146	struct led_classdev_flash *fled_cdev = &priv->fled_cdev;
147	struct led_flash_setting *s;
148
149	/* Init flash timeout setting */
150	s = &fled_cdev->timeout;
151	s->min = 1;
152	s->max = priv->max_timeout;
153	s->step = 1;
154	s->val = FLASH_TIMEOUT_DEFAULT;
155	}
156
157	#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
158	static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
159	struct v4l2_flash_config *v4l2_sd_cfg)
160	{
161	struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev;
162	struct led_flash_setting *s;
163
164	strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,
165	sizeof(v4l2_sd_cfg->dev_name));
166
167	/* Init flash intensity setting */
168	s = &v4l2_sd_cfg->intensity;
169	s->min = 0;
170	s->max = 1;
171	s->step = 1;
172	s->val = 1;
173	}
174
175	#else
176	static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
177	struct v4l2_flash_config *v4l2_sd_cfg)
178	{
179	}
180	#endif
181
182	static int sgm3140_probe(struct platform_device *pdev)
183	{
184	struct sgm3140 *priv;
185	struct led_classdev *led_cdev;
186	struct led_classdev_flash *fled_cdev;
187	struct led_init_data init_data = {};
188	struct fwnode_handle *child_node;
189	struct v4l2_flash_config v4l2_sd_cfg = {};
190	int ret;
191
192	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
193	if (!priv)
194	return -ENOMEM;
195
196	priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW);
197	ret = PTR_ERR_OR_ZERO(priv->flash_gpio);
4582e783 KK	198	if (ret)
	199	return dev_err_probe(&pdev->dev, ret,
	200	"Failed to request flash gpio\n");
cef8ec8c LW	201
	202	priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
	203	ret = PTR_ERR_OR_ZERO(priv->enable_gpio);
4582e783 KK	204	if (ret)
	205	return dev_err_probe(&pdev->dev, ret,
	206	"Failed to request enable gpio\n");
cef8ec8c LW	207
	208	priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin");
	209	ret = PTR_ERR_OR_ZERO(priv->vin_regulator);
4582e783 KK	210	if (ret)
	211	return dev_err_probe(&pdev->dev, ret,
	212	"Failed to request regulator\n");
cef8ec8c LW	213
	214	child_node = fwnode_get_next_available_child_node(pdev->dev.fwnode,
	215	NULL);
	216	if (!child_node) {
	217	dev_err(&pdev->dev,
	218	"No fwnode child node found for connected LED.\n");
	219	return -EINVAL;
	220	}
	221
	222	ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us",
	223	&priv->max_timeout);
	224	if (ret) {
	225	priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT;
	226	dev_warn(&pdev->dev,
	227	"flash-max-timeout-us property missing\n");
	228	}
	229
	230	/*
	231	* Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout
	232	* from DT is lower.
	233	*/
	234	priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT);
	235
	236	timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0);
	237
	238	fled_cdev = &priv->fled_cdev;
	239	led_cdev = &fled_cdev->led_cdev;
	240
	241	fled_cdev->ops = &sgm3140_flash_ops;
	242
	243	led_cdev->brightness_set_blocking = sgm3140_brightness_set;
	244	led_cdev->max_brightness = LED_ON;
	245	led_cdev->flags \|= LED_DEV_CAP_FLASH;
	246
	247	sgm3140_init_flash_timeout(priv);
	248
	249	init_data.fwnode = child_node;
	250
	251	platform_set_drvdata(pdev, priv);
	252
	253	/* Register in the LED subsystem */
	254	ret = devm_led_classdev_flash_register_ext(&pdev->dev,
	255	fled_cdev, &init_data);
	256	if (ret) {
	257	dev_err(&pdev->dev, "Failed to register flash device: %d\n",
	258	ret);
	259	goto err;
	260	}
	261
	262	sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg);
	263
	264	/* Create V4L2 Flash subdev */
	265	priv->v4l2_flash = v4l2_flash_init(&pdev->dev,
	266	child_node,
	267	fled_cdev, NULL,
	268	&v4l2_sd_cfg);
	269	if (IS_ERR(priv->v4l2_flash)) {
	270	ret = PTR_ERR(priv->v4l2_flash);
	271	goto err;
	272	}
	273
	274	return ret;
	275
	276	err:
277	fwnode_handle_put(child_node);
278	return ret;
279	}
280
281	static int sgm3140_remove(struct platform_device *pdev)
282	{
283	struct sgm3140 *priv = platform_get_drvdata(pdev);
284
285	del_timer_sync(&priv->powerdown_timer);
286
287	v4l2_flash_release(priv->v4l2_flash);
288
289	return 0;
290	}
291
292	static const struct of_device_id sgm3140_dt_match[] = {
77d62fcc	293	{ .compatible = "ocs,ocp8110" },
7bd932d9	294	{ .compatible = "richtek,rt5033-led" },
cef8ec8c LW	295	{ .compatible = "sgmicro,sgm3140" },
	296	{ /* sentinel */ }
	297	};
	298	MODULE_DEVICE_TABLE(of, sgm3140_dt_match);
	299
	300	static struct platform_driver sgm3140_driver = {
	301	.probe = sgm3140_probe,
	302	.remove = sgm3140_remove,
	303	.driver = {
	304	.name = "sgm3140",
	305	.of_match_table = sgm3140_dt_match,
	306	},
	307	};
	308
	309	module_platform_driver(sgm3140_driver);
	310
	311	MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xyz>");
deae5de3	312	MODULE_DESCRIPTION("SG Micro SGM3140 charge pump LED driver");
cef8ec8c	313	MODULE_LICENSE("GPL v2");