[linux-2.6-block.git] / drivers / leds / leds-lm3601x.c

// SPDX-License-Identifier: GPL-2.0
// Flash and torch driver for Texas Instruments LM3601X LED
// Flash driver chip family
// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <uapi/linux/uleds.h>

#define LM3601X_LED_IR		0x0
#define LM3601X_LED_TORCH	0x1

/* Registers */
#define LM3601X_ENABLE_REG	0x01
#define LM3601X_CFG_REG		0x02
#define LM3601X_LED_FLASH_REG	0x03
#define LM3601X_LED_TORCH_REG	0x04
#define LM3601X_FLAGS_REG	0x05
#define LM3601X_DEV_ID_REG	0x06

#define LM3601X_SW_RESET	BIT(7)

/* Enable Mode bits */
#define LM3601X_MODE_STANDBY	0x00
#define LM3601X_MODE_IR_DRV	BIT(0)
#define LM3601X_MODE_TORCH	BIT(1)
#define LM3601X_MODE_STROBE	(BIT(0) | BIT(1))
#define LM3601X_STRB_EN		BIT(2)
#define LM3601X_STRB_EDGE_TRIG	BIT(3)
#define LM3601X_IVFM_EN		BIT(4)

#define LM36010_BOOST_LIMIT_28	BIT(5)
#define LM36010_BOOST_FREQ_4MHZ	BIT(6)
#define LM36010_BOOST_MODE_PASS	BIT(7)

/* Flag Mask */
#define LM3601X_FLASH_TIME_OUT	BIT(0)
#define LM3601X_UVLO_FAULT	BIT(1)
#define LM3601X_THERM_SHUTDOWN	BIT(2)
#define LM3601X_THERM_CURR	BIT(3)
#define LM36010_CURR_LIMIT	BIT(4)
#define LM3601X_SHORT_FAULT	BIT(5)
#define LM3601X_IVFM_TRIP	BIT(6)
#define LM36010_OVP_FAULT	BIT(7)

#define LM3601X_MAX_TORCH_I_UA	376000
#define LM3601X_MIN_TORCH_I_UA	2400
#define LM3601X_TORCH_REG_DIV	2965

#define LM3601X_MAX_STROBE_I_UA	1500000
#define LM3601X_MIN_STROBE_I_UA	11000
#define LM3601X_STROBE_REG_DIV	11800

#define LM3601X_TIMEOUT_MASK	0x1e
#define LM3601X_ENABLE_MASK	(LM3601X_MODE_IR_DRV | LM3601X_MODE_TORCH)

#define LM3601X_LOWER_STEP_US	40000
#define LM3601X_UPPER_STEP_US	200000
#define LM3601X_MIN_TIMEOUT_US	40000
#define LM3601X_MAX_TIMEOUT_US	1600000
#define LM3601X_TIMEOUT_XOVER_US 400000

enum lm3601x_type {
	CHIP_LM36010 = 0,
	CHIP_LM36011,
};

/**
 * struct lm3601x_led -
 * @fled_cdev: flash LED class device pointer
 * @client: Pointer to the I2C client
 * @regmap: Devices register map
 * @lock: Lock for reading/writing the device
 * @led_name: LED label for the Torch or IR LED
 * @flash_timeout: the timeout for the flash
 * @last_flag: last known flags register value
 * @torch_current_max: maximum current for the torch
 * @flash_current_max: maximum current for the flash
 * @max_flash_timeout: maximum timeout for the flash
 * @led_mode: The mode to enable either IR or Torch
 */
struct lm3601x_led {
	struct led_classdev_flash fled_cdev;
	struct i2c_client *client;
	struct regmap *regmap;
	struct mutex lock;

	char led_name[LED_MAX_NAME_SIZE];

	unsigned int flash_timeout;
	unsigned int last_flag;

	u32 torch_current_max;
	u32 flash_current_max;
	u32 max_flash_timeout;

	u32 led_mode;
};

static const struct reg_default lm3601x_regmap_defs[] = {
	{ LM3601X_ENABLE_REG, 0x20 },
	{ LM3601X_CFG_REG, 0x15 },
	{ LM3601X_LED_FLASH_REG, 0x00 },
	{ LM3601X_LED_TORCH_REG, 0x00 },
};

static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LM3601X_FLAGS_REG:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config lm3601x_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = LM3601X_DEV_ID_REG,
	.reg_defaults = lm3601x_regmap_defs,
	.num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs),
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = lm3601x_volatile_reg,
};

static struct lm3601x_led *fled_cdev_to_led(struct led_classdev_flash *fled_cdev)
{
	return container_of(fled_cdev, struct lm3601x_led, fled_cdev);
}

static int lm3601x_read_faults(struct lm3601x_led *led)
{
	int flags_val;
	int ret;

	ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val);
	if (ret < 0)
		return -EIO;

	led->last_flag = 0;

	if (flags_val & LM36010_OVP_FAULT)
		led->last_flag |= LED_FAULT_OVER_VOLTAGE;

	if (flags_val & (LM3601X_THERM_SHUTDOWN | LM3601X_THERM_CURR))
		led->last_flag |= LED_FAULT_OVER_TEMPERATURE;

	if (flags_val & LM3601X_SHORT_FAULT)
		led->last_flag |= LED_FAULT_SHORT_CIRCUIT;

	if (flags_val & LM36010_CURR_LIMIT)
		led->last_flag |= LED_FAULT_OVER_CURRENT;

	if (flags_val & LM3601X_UVLO_FAULT)
		led->last_flag |= LED_FAULT_UNDER_VOLTAGE;

	if (flags_val & LM3601X_IVFM_TRIP)
		led->last_flag |= LED_FAULT_INPUT_VOLTAGE;

	if (flags_val & LM3601X_THERM_SHUTDOWN)
		led->last_flag |= LED_FAULT_LED_OVER_TEMPERATURE;

	return led->last_flag;
}

static int lm3601x_brightness_set(struct led_classdev *cdev,
					enum led_brightness brightness)
{
	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
	int ret, led_mode_val;

	mutex_lock(&led->lock);

	ret = lm3601x_read_faults(led);
	if (ret < 0)
		goto out;

	if (led->led_mode == LM3601X_LED_TORCH)
		led_mode_val = LM3601X_MODE_TORCH;
	else
		led_mode_val = LM3601X_MODE_IR_DRV;

	if (brightness == LED_OFF) {
		ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
					led_mode_val, LED_OFF);
		goto out;
	}

	ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness);
	if (ret < 0)
		goto out;

	ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
				LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV,
				led_mode_val);
out:
	mutex_unlock(&led->lock);
	return ret;
}

static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev,
				bool state)
{
	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
	int timeout_reg_val;
	int current_timeout;
	int ret;

	mutex_lock(&led->lock);

	ret = regmap_read(led->regmap, LM3601X_CFG_REG, &current_timeout);
	if (ret < 0)
		goto out;

	if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US)
		timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07;
	else
		timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01;

	if (led->flash_timeout != current_timeout)
		ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG,
					LM3601X_TIMEOUT_MASK, timeout_reg_val);

	if (state)
		ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
					LM3601X_MODE_TORCH | LM3601X_MODE_IR_DRV,
					LM3601X_MODE_STROBE);
	else
		ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
					LM3601X_MODE_STROBE, LED_OFF);

	ret = lm3601x_read_faults(led);
out:
	mutex_unlock(&led->lock);
	return ret;
}

static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev,
					u32 brightness)
{
	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
	u8 brightness_val;
	int ret;

	mutex_lock(&led->lock);
	ret = lm3601x_read_faults(led);
	if (ret < 0)
		goto out;

	if (brightness == LED_OFF) {
		ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
					LM3601X_MODE_STROBE, LED_OFF);
		goto out;
	}

	brightness_val = brightness / LM3601X_STROBE_REG_DIV;

	ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val);
out:
	mutex_unlock(&led->lock);
	return ret;
}

static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev,
				u32 timeout)
{
	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);

	mutex_lock(&led->lock);

	led->flash_timeout = timeout;

	mutex_unlock(&led->lock);

	return 0;
}

static int lm3601x_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
{
	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
	int strobe_state;
	int ret;

	mutex_lock(&led->lock);

	ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state);
	if (ret < 0)
		goto out;

	*state = strobe_state & LM3601X_MODE_STROBE;

out:
	mutex_unlock(&led->lock);
	return ret;
}

static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev,
				u32 *fault)
{
	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);

	lm3601x_read_faults(led);

	*fault = led->last_flag;

	return 0;
}

static const struct led_flash_ops flash_ops = {
	.flash_brightness_set	= lm3601x_flash_brightness_set,
	.strobe_set		= lm3601x_strobe_set,
	.strobe_get		= lm3601x_strobe_get,
	.timeout_set		= lm3601x_flash_timeout_set,
	.fault_get		= lm3601x_flash_fault_get,
};

static int lm3601x_register_leds(struct lm3601x_led *led)
{
	struct led_classdev *led_cdev;
	struct led_flash_setting *setting;

	led->fled_cdev.ops = &flash_ops;

	setting = &led->fled_cdev.timeout;
	setting->min = LM3601X_MIN_TIMEOUT_US;
	setting->max = led->max_flash_timeout;
	setting->step = LM3601X_LOWER_STEP_US;
	setting->val = led->max_flash_timeout;

	setting = &led->fled_cdev.brightness;
	setting->min = LM3601X_MIN_STROBE_I_UA;
	setting->max = led->flash_current_max;
	setting->step = LM3601X_TORCH_REG_DIV;
	setting->val = led->flash_current_max;

	led_cdev = &led->fled_cdev.led_cdev;
	led_cdev->name = led->led_name;
	led_cdev->brightness_set_blocking = lm3601x_brightness_set;
	led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max,
						LM3601X_TORCH_REG_DIV);
	led_cdev->flags |= LED_DEV_CAP_FLASH;

	return led_classdev_flash_register(&led->client->dev, &led->fled_cdev);
}

static int lm3601x_parse_node(struct lm3601x_led *led)
{
	struct fwnode_handle *child = NULL;
	int ret = -ENODEV;
	const char *name;

	child = device_get_next_child_node(&led->client->dev, child);
	if (!child) {
		dev_err(&led->client->dev, "No LED Child node\n");
		return ret;
	}

	ret = fwnode_property_read_u32(child, "reg", &led->led_mode);
	if (ret) {
		dev_err(&led->client->dev, "reg DT property missing\n");
		goto out_err;
	}

	if (led->led_mode > LM3601X_LED_TORCH ||
	    led->led_mode < LM3601X_LED_IR) {
		dev_warn(&led->client->dev, "Invalid led mode requested\n");
		ret = -EINVAL;
		goto out_err;
	}

	ret = fwnode_property_read_string(child, "label", &name);
	if (ret) {
		if (led->led_mode == LM3601X_LED_TORCH)
			name = "torch";
		else
			name = "infrared";
	}

	snprintf(led->led_name, sizeof(led->led_name),
		"%s:%s", led->client->name, name);

	ret = fwnode_property_read_u32(child, "led-max-microamp",
					&led->torch_current_max);
	if (ret) {
		dev_warn(&led->client->dev,
			"led-max-microamp DT property missing\n");
		goto out_err;
	}

	ret = fwnode_property_read_u32(child, "flash-max-microamp",
				&led->flash_current_max);
	if (ret) {
		dev_warn(&led->client->dev,
			 "flash-max-microamp DT property missing\n");
		goto out_err;
	}

	ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
				&led->max_flash_timeout);
	if (ret) {
		dev_warn(&led->client->dev,
			 "flash-max-timeout-us DT property missing\n");
		goto out_err;
	}

out_err:
	fwnode_handle_put(child);
	return ret;
}

static int lm3601x_probe(struct i2c_client *client)
{
	struct lm3601x_led *led;
	int ret;

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

	led->client = client;
	i2c_set_clientdata(client, led);

	ret = lm3601x_parse_node(led);
	if (ret)
		return -ENODEV;

	led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap);
	if (IS_ERR(led->regmap)) {
		ret = PTR_ERR(led->regmap);
		dev_err(&client->dev,
			"Failed to allocate register map: %d\n", ret);
		return ret;
	}

	mutex_init(&led->lock);

	return lm3601x_register_leds(led);
}

static int lm3601x_remove(struct i2c_client *client)
{
	struct lm3601x_led *led = i2c_get_clientdata(client);

	led_classdev_flash_unregister(&led->fled_cdev);
	mutex_destroy(&led->lock);

	return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
			   LM3601X_ENABLE_MASK,
			   LM3601X_MODE_STANDBY);
}

static const struct i2c_device_id lm3601x_id[] = {
	{ "LM36010", CHIP_LM36010 },
	{ "LM36011", CHIP_LM36011 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm3601x_id);

static const struct of_device_id of_lm3601x_leds_match[] = {
	{ .compatible = "ti,lm36010", },
	{ .compatible = "ti,lm36011", },
	{ }
};
MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match);

static struct i2c_driver lm3601x_i2c_driver = {
	.driver = {
		.name = "lm3601x",
		.of_match_table = of_lm3601x_leds_match,
	},
	.probe_new = lm3601x_probe,
	.remove = lm3601x_remove,
	.id_table = lm3601x_id,
};
module_i2c_driver(lm3601x_i2c_driver);

MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
57a53297 DM	1	// SPDX-License-Identifier: GPL-2.0
	2	// Flash and torch driver for Texas Instruments LM3601X LED
	3	// Flash driver chip family
	4	// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
	5
	6	#include <linux/delay.h>
	7	#include <linux/i2c.h>
	8	#include <linux/leds.h>
	9	#include <linux/led-class-flash.h>
	10	#include <linux/module.h>
	11	#include <linux/regmap.h>
	12	#include <linux/slab.h>
	13	#include <uapi/linux/uleds.h>
	14
	15	#define LM3601X_LED_IR 0x0
	16	#define LM3601X_LED_TORCH 0x1
	17
	18	/* Registers */
	19	#define LM3601X_ENABLE_REG 0x01
	20	#define LM3601X_CFG_REG 0x02
	21	#define LM3601X_LED_FLASH_REG 0x03
	22	#define LM3601X_LED_TORCH_REG 0x04
	23	#define LM3601X_FLAGS_REG 0x05
	24	#define LM3601X_DEV_ID_REG 0x06
	25
	26	#define LM3601X_SW_RESET BIT(7)
	27
	28	/* Enable Mode bits */
	29	#define LM3601X_MODE_STANDBY 0x00
	30	#define LM3601X_MODE_IR_DRV BIT(0)
	31	#define LM3601X_MODE_TORCH BIT(1)
	32	#define LM3601X_MODE_STROBE (BIT(0) \| BIT(1))
	33	#define LM3601X_STRB_EN BIT(2)
	34	#define LM3601X_STRB_EDGE_TRIG BIT(3)
	35	#define LM3601X_IVFM_EN BIT(4)
	36
	37	#define LM36010_BOOST_LIMIT_28 BIT(5)
	38	#define LM36010_BOOST_FREQ_4MHZ BIT(6)
	39	#define LM36010_BOOST_MODE_PASS BIT(7)
	40
	41	/* Flag Mask */
	42	#define LM3601X_FLASH_TIME_OUT BIT(0)
	43	#define LM3601X_UVLO_FAULT BIT(1)
	44	#define LM3601X_THERM_SHUTDOWN BIT(2)
	45	#define LM3601X_THERM_CURR BIT(3)
	46	#define LM36010_CURR_LIMIT BIT(4)
	47	#define LM3601X_SHORT_FAULT BIT(5)
	48	#define LM3601X_IVFM_TRIP BIT(6)
	49	#define LM36010_OVP_FAULT BIT(7)
	50
	51	#define LM3601X_MAX_TORCH_I_UA 376000
	52	#define LM3601X_MIN_TORCH_I_UA 2400
	53	#define LM3601X_TORCH_REG_DIV 2965
	54
	55	#define LM3601X_MAX_STROBE_I_UA 1500000
	56	#define LM3601X_MIN_STROBE_I_UA 11000
	57	#define LM3601X_STROBE_REG_DIV 11800
	58
	59	#define LM3601X_TIMEOUT_MASK 0x1e
	60	#define LM3601X_ENABLE_MASK (LM3601X_MODE_IR_DRV \| LM3601X_MODE_TORCH)
	61
	62	#define LM3601X_LOWER_STEP_US 40000
	63	#define LM3601X_UPPER_STEP_US 200000
	64	#define LM3601X_MIN_TIMEOUT_US 40000
65	#define LM3601X_MAX_TIMEOUT_US 1600000
66	#define LM3601X_TIMEOUT_XOVER_US 400000
67
68	enum lm3601x_type {
69	CHIP_LM36010 = 0,
70	CHIP_LM36011,
71	};
72
73	/**
74	* struct lm3601x_led -
75	* @fled_cdev: flash LED class device pointer
76	* @client: Pointer to the I2C client
77	* @regmap: Devices register map
78	* @lock: Lock for reading/writing the device
79	* @led_name: LED label for the Torch or IR LED
80	* @flash_timeout: the timeout for the flash
81	* @last_flag: last known flags register value
82	* @torch_current_max: maximum current for the torch
83	* @flash_current_max: maximum current for the flash
84	* @max_flash_timeout: maximum timeout for the flash
85	* @led_mode: The mode to enable either IR or Torch
86	*/
87	struct lm3601x_led {
88	struct led_classdev_flash fled_cdev;
89	struct i2c_client *client;
90	struct regmap *regmap;
91	struct mutex lock;
92
93	char led_name[LED_MAX_NAME_SIZE];
94
95	unsigned int flash_timeout;
96	unsigned int last_flag;
97
98	u32 torch_current_max;
99	u32 flash_current_max;
100	u32 max_flash_timeout;
101
102	u32 led_mode;
103	};
104
105	static const struct reg_default lm3601x_regmap_defs[] = {
106	{ LM3601X_ENABLE_REG, 0x20 },
107	{ LM3601X_CFG_REG, 0x15 },
108	{ LM3601X_LED_FLASH_REG, 0x00 },
109	{ LM3601X_LED_TORCH_REG, 0x00 },
110	};
111
112	static bool lm3601x_volatile_reg(struct device *dev, unsigned int reg)
113	{
114	switch (reg) {
115	case LM3601X_FLAGS_REG:
116	return true;
117	default:
118	return false;
119	}
120	}
121
122	static const struct regmap_config lm3601x_regmap = {
123	.reg_bits = 8,
124	.val_bits = 8,
125
126	.max_register = LM3601X_DEV_ID_REG,
127	.reg_defaults = lm3601x_regmap_defs,
128	.num_reg_defaults = ARRAY_SIZE(lm3601x_regmap_defs),
129	.cache_type = REGCACHE_RBTREE,
130	.volatile_reg = lm3601x_volatile_reg,
131	};
132
133	static struct lm3601x_led fled_cdev_to_led(struct led_classdev_flash fled_cdev)
134	{
135	return container_of(fled_cdev, struct lm3601x_led, fled_cdev);
136	}
137
138	static int lm3601x_read_faults(struct lm3601x_led *led)
139	{
140	int flags_val;
141	int ret;
142
143	ret = regmap_read(led->regmap, LM3601X_FLAGS_REG, &flags_val);
144	if (ret < 0)
145	return -EIO;
146
147	led->last_flag = 0;
148
149	if (flags_val & LM36010_OVP_FAULT)
150	led->last_flag \|= LED_FAULT_OVER_VOLTAGE;
151
152	if (flags_val & (LM3601X_THERM_SHUTDOWN \| LM3601X_THERM_CURR))
153	led->last_flag \|= LED_FAULT_OVER_TEMPERATURE;
154
155	if (flags_val & LM3601X_SHORT_FAULT)
156	led->last_flag \|= LED_FAULT_SHORT_CIRCUIT;
157
158	if (flags_val & LM36010_CURR_LIMIT)
159	led->last_flag \|= LED_FAULT_OVER_CURRENT;
160
161	if (flags_val & LM3601X_UVLO_FAULT)
162	led->last_flag \|= LED_FAULT_UNDER_VOLTAGE;
163
164	if (flags_val & LM3601X_IVFM_TRIP)
165	led->last_flag \|= LED_FAULT_INPUT_VOLTAGE;
166
167	if (flags_val & LM3601X_THERM_SHUTDOWN)
168	led->last_flag \|= LED_FAULT_LED_OVER_TEMPERATURE;
169
170	return led->last_flag;
171	}
172
173	static int lm3601x_brightness_set(struct led_classdev *cdev,
174	enum led_brightness brightness)
175	{
176	struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
177	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
178	int ret, led_mode_val;
179
180	mutex_lock(&led->lock);
181
182	ret = lm3601x_read_faults(led);
183	if (ret < 0)
184	goto out;
185
186	if (led->led_mode == LM3601X_LED_TORCH)
187	led_mode_val = LM3601X_MODE_TORCH;
188	else
189	led_mode_val = LM3601X_MODE_IR_DRV;
190
191	if (brightness == LED_OFF) {
192	ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
193	led_mode_val, LED_OFF);
194	goto out;
195	}
196
197	ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness);
198	if (ret < 0)
199	goto out;
200
201	ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
202	LM3601X_MODE_TORCH \| LM3601X_MODE_IR_DRV,
203	led_mode_val);
204	out:
205	mutex_unlock(&led->lock);
206	return ret;
207	}
208
209	static int lm3601x_strobe_set(struct led_classdev_flash *fled_cdev,
210	bool state)
211	{
212	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
213	int timeout_reg_val;
214	int current_timeout;
215	int ret;
216
217	mutex_lock(&led->lock);
218
219	ret = regmap_read(led->regmap, LM3601X_CFG_REG, &current_timeout);
220	if (ret < 0)
221	goto out;
222
223	if (led->flash_timeout >= LM3601X_TIMEOUT_XOVER_US)
224	timeout_reg_val = led->flash_timeout / LM3601X_UPPER_STEP_US + 0x07;
225	else
226	timeout_reg_val = led->flash_timeout / LM3601X_LOWER_STEP_US - 0x01;
227
228	if (led->flash_timeout != current_timeout)
229	ret = regmap_update_bits(led->regmap, LM3601X_CFG_REG,
230	LM3601X_TIMEOUT_MASK, timeout_reg_val);
231
232	if (state)
233	ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
234	LM3601X_MODE_TORCH \| LM3601X_MODE_IR_DRV,
235	LM3601X_MODE_STROBE);
236	else
237	ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
238	LM3601X_MODE_STROBE, LED_OFF);
239
240	ret = lm3601x_read_faults(led);
241	out:
242	mutex_unlock(&led->lock);
243	return ret;
244	}
245
246	static int lm3601x_flash_brightness_set(struct led_classdev_flash *fled_cdev,
247	u32 brightness)
248	{
249	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
250	u8 brightness_val;
251	int ret;
252
253	mutex_lock(&led->lock);
254	ret = lm3601x_read_faults(led);
255	if (ret < 0)
256	goto out;
257
258	if (brightness == LED_OFF) {
259	ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
260	LM3601X_MODE_STROBE, LED_OFF);
261	goto out;
262	}
263
264	brightness_val = brightness / LM3601X_STROBE_REG_DIV;
265
266	ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val);
267	out:
268	mutex_unlock(&led->lock);
269	return ret;
270	}
271
272	static int lm3601x_flash_timeout_set(struct led_classdev_flash *fled_cdev,
273	u32 timeout)
274	{
275	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
276
277	mutex_lock(&led->lock);
278
279	led->flash_timeout = timeout;
280
281	mutex_unlock(&led->lock);
282
283	return 0;
284	}
285
286	static int lm3601x_strobe_get(struct led_classdev_flash fled_cdev, bool state)
287	{
288	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
289	int strobe_state;
290	int ret;
291
292	mutex_lock(&led->lock);
293
294	ret = regmap_read(led->regmap, LM3601X_ENABLE_REG, &strobe_state);
295	if (ret < 0)
296	goto out;
297
298	*state = strobe_state & LM3601X_MODE_STROBE;
299
300	out:
301	mutex_unlock(&led->lock);
302	return ret;
303	}
304
305	static int lm3601x_flash_fault_get(struct led_classdev_flash *fled_cdev,
306	u32 *fault)
307	{
308	struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
309
310	lm3601x_read_faults(led);
311
312	*fault = led->last_flag;
313
314	return 0;
315	}
316
317	static const struct led_flash_ops flash_ops = {
318	.flash_brightness_set = lm3601x_flash_brightness_set,
319	.strobe_set = lm3601x_strobe_set,
320	.strobe_get = lm3601x_strobe_get,
321	.timeout_set = lm3601x_flash_timeout_set,
322	.fault_get = lm3601x_flash_fault_get,
323	};
324
325	static int lm3601x_register_leds(struct lm3601x_led *led)
326	{
327	struct led_classdev *led_cdev;
328	struct led_flash_setting *setting;
329
330	led->fled_cdev.ops = &flash_ops;
331
332	setting = &led->fled_cdev.timeout;
333	setting->min = LM3601X_MIN_TIMEOUT_US;
334	setting->max = led->max_flash_timeout;
335	setting->step = LM3601X_LOWER_STEP_US;
336	setting->val = led->max_flash_timeout;
337
338	setting = &led->fled_cdev.brightness;
339	setting->min = LM3601X_MIN_STROBE_I_UA;
340	setting->max = led->flash_current_max;
341	setting->step = LM3601X_TORCH_REG_DIV;
342	setting->val = led->flash_current_max;
343
344	led_cdev = &led->fled_cdev.led_cdev;
345	led_cdev->name = led->led_name;
346	led_cdev->brightness_set_blocking = lm3601x_brightness_set;
347	led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max,
348	LM3601X_TORCH_REG_DIV);
349	led_cdev->flags \|= LED_DEV_CAP_FLASH;
350
351	return led_classdev_flash_register(&led->client->dev, &led->fled_cdev);
352	}
353
354	static int lm3601x_parse_node(struct lm3601x_led *led)
355	{
356	struct fwnode_handle *child = NULL;
357	int ret = -ENODEV;
358	const char *name;
359
360	child = device_get_next_child_node(&led->client->dev, child);
361	if (!child) {
362	dev_err(&led->client->dev, "No LED Child node\n");
363	return ret;
364	}
365
366	ret = fwnode_property_read_u32(child, "reg", &led->led_mode);
367	if (ret) {
368	dev_err(&led->client->dev, "reg DT property missing\n");
369	goto out_err;
370	}
371
372	if (led->led_mode > LM3601X_LED_TORCH \|\|
373	led->led_mode < LM3601X_LED_IR) {
374	dev_warn(&led->client->dev, "Invalid led mode requested\n");
375	ret = -EINVAL;
376	goto out_err;
377	}
378
379	ret = fwnode_property_read_string(child, "label", &name);
380	if (ret) {
381	if (led->led_mode == LM3601X_LED_TORCH)
382	name = "torch";
383	else
384	name = "infrared";
385	}
386
387	snprintf(led->led_name, sizeof(led->led_name),
388	"%s:%s", led->client->name, name);
389
390	ret = fwnode_property_read_u32(child, "led-max-microamp",
391	&led->torch_current_max);
392	if (ret) {
393	dev_warn(&led->client->dev,
394	"led-max-microamp DT property missing\n");
395	goto out_err;
396	}
397
398	ret = fwnode_property_read_u32(child, "flash-max-microamp",
399	&led->flash_current_max);
400	if (ret) {
401	dev_warn(&led->client->dev,
402	"flash-max-microamp DT property missing\n");
403	goto out_err;
404	}
405
406	ret = fwnode_property_read_u32(child, "flash-max-timeout-us",
407	&led->max_flash_timeout);
408	if (ret) {
409	dev_warn(&led->client->dev,
410	"flash-max-timeout-us DT property missing\n");
411	goto out_err;
412	}
413
414	out_err:
415	fwnode_handle_put(child);
416	return ret;
417	}
418
419	static int lm3601x_probe(struct i2c_client *client)
420	{
421	struct lm3601x_led *led;
422	int ret;
423
424	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
425	if (!led)
426	return -ENOMEM;
427
428	led->client = client;
429	i2c_set_clientdata(client, led);
430
431	ret = lm3601x_parse_node(led);
432	if (ret)
433	return -ENODEV;
434
435	led->regmap = devm_regmap_init_i2c(client, &lm3601x_regmap);
436	if (IS_ERR(led->regmap)) {
437	ret = PTR_ERR(led->regmap);
438	dev_err(&client->dev,
439	"Failed to allocate register map: %d\n", ret);
440	return ret;
441	}
442
443	mutex_init(&led->lock);
444
445	return lm3601x_register_leds(led);
446	}
447
448	static int lm3601x_remove(struct i2c_client *client)
449	{
450	struct lm3601x_led *led = i2c_get_clientdata(client);
451
452	led_classdev_flash_unregister(&led->fled_cdev);
453	mutex_destroy(&led->lock);
454
455	return regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
456	LM3601X_ENABLE_MASK,
457	LM3601X_MODE_STANDBY);
458	}
459
460	static const struct i2c_device_id lm3601x_id[] = {
461	{ "LM36010", CHIP_LM36010 },
462	{ "LM36011", CHIP_LM36011 },
463	{ }
464	};
465	MODULE_DEVICE_TABLE(i2c, lm3601x_id);
466
467	static const struct of_device_id of_lm3601x_leds_match[] = {
468	{ .compatible = "ti,lm36010", },
469	{ .compatible = "ti,lm36011", },
470	{ }
471	};
472	MODULE_DEVICE_TABLE(of, of_lm3601x_leds_match);
473
474	static struct i2c_driver lm3601x_i2c_driver = {
475	.driver = {
476	.name = "lm3601x",
477	.of_match_table = of_lm3601x_leds_match,
478	},
479	.probe_new = lm3601x_probe,
480	.remove = lm3601x_remove,
481	.id_table = lm3601x_id,
482	};
483	module_i2c_driver(lm3601x_i2c_driver);
484
485	MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3601X");
486	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
487	MODULE_LICENSE("GPL v2");