[linux.git] / drivers / leds / leds-cpcap.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2017 Sebastian Reichel <[email protected]>
 */

#include <linux/leds.h>
#include <linux/mfd/motorola-cpcap.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

#define CPCAP_LED_NO_CURRENT 0x0001

struct cpcap_led_info {
	u16 reg;
	u16 mask;
	u16 limit;
	u16 init_mask;
	u16 init_val;
};

static const struct cpcap_led_info cpcap_led_red = {
	.reg	= CPCAP_REG_REDC,
	.mask	= 0x03FF,
	.limit	= 31,
};

static const struct cpcap_led_info cpcap_led_green = {
	.reg	= CPCAP_REG_GREENC,
	.mask	= 0x03FF,
	.limit	= 31,
};

static const struct cpcap_led_info cpcap_led_blue = {
	.reg	= CPCAP_REG_BLUEC,
	.mask	= 0x03FF,
	.limit	= 31,
};

/* aux display light */
static const struct cpcap_led_info cpcap_led_adl = {
	.reg		= CPCAP_REG_ADLC,
	.mask		= 0x000F,
	.limit		= 1,
	.init_mask	= 0x7FFF,
	.init_val	= 0x5FF0,
};

/* camera privacy led */
static const struct cpcap_led_info cpcap_led_cp = {
	.reg		= CPCAP_REG_CLEDC,
	.mask		= 0x0007,
	.limit		= 1,
	.init_mask	= 0x03FF,
	.init_val	= 0x0008,
};

struct cpcap_led {
	struct led_classdev led;
	const struct cpcap_led_info *info;
	struct device *dev;
	struct regmap *regmap;
	struct mutex update_lock;
	struct regulator *vdd;
	bool powered;

	u32 current_limit;
};

static u16 cpcap_led_val(u8 current_limit, u8 duty_cycle)
{
	current_limit &= 0x1f; /* 5 bit */
	duty_cycle &= 0x0f; /* 4 bit */

	return current_limit << 4 | duty_cycle;
}

static int cpcap_led_set_power(struct cpcap_led *led, bool status)
{
	int err;

	if (status == led->powered)
		return 0;

	if (status)
		err = regulator_enable(led->vdd);
	else
		err = regulator_disable(led->vdd);

	if (err) {
		dev_err(led->dev, "regulator failure: %d", err);
		return err;
	}

	led->powered = status;

	return 0;
}

static int cpcap_led_set(struct led_classdev *ledc, enum led_brightness value)
{
	struct cpcap_led *led = container_of(ledc, struct cpcap_led, led);
	int brightness;
	int err;

	mutex_lock(&led->update_lock);

	if (value > LED_OFF) {
		err = cpcap_led_set_power(led, true);
		if (err)
			goto exit;
	}

	if (value == LED_OFF) {
		/* Avoid HW issue by turning off current before duty cycle */
		err = regmap_update_bits(led->regmap,
			led->info->reg, led->info->mask, CPCAP_LED_NO_CURRENT);
		if (err) {
			dev_err(led->dev, "regmap failed: %d", err);
			goto exit;
		}

		brightness = cpcap_led_val(value, LED_OFF);
	} else {
		brightness = cpcap_led_val(value, LED_ON);
	}

	err = regmap_update_bits(led->regmap, led->info->reg, led->info->mask,
		brightness);
	if (err) {
		dev_err(led->dev, "regmap failed: %d", err);
		goto exit;
	}

	if (value == LED_OFF) {
		err = cpcap_led_set_power(led, false);
		if (err)
			goto exit;
	}

exit:
	mutex_unlock(&led->update_lock);
	return err;
}

static const struct of_device_id cpcap_led_of_match[] = {
	{ .compatible = "motorola,cpcap-led-red", .data = &cpcap_led_red },
	{ .compatible = "motorola,cpcap-led-green", .data = &cpcap_led_green },
	{ .compatible = "motorola,cpcap-led-blue",  .data = &cpcap_led_blue },
	{ .compatible = "motorola,cpcap-led-adl", .data = &cpcap_led_adl },
	{ .compatible = "motorola,cpcap-led-cp", .data = &cpcap_led_cp },
	{},
};
MODULE_DEVICE_TABLE(of, cpcap_led_of_match);

static int cpcap_led_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	struct cpcap_led *led;
	int err;

	match = of_match_device(of_match_ptr(cpcap_led_of_match), &pdev->dev);
	if (!match || !match->data)
		return -EINVAL;

	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;
	platform_set_drvdata(pdev, led);
	led->info = match->data;
	led->dev = &pdev->dev;

	if (led->info->reg == 0x0000) {
		dev_err(led->dev, "Unsupported LED");
		return -ENODEV;
	}

	led->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!led->regmap)
		return -ENODEV;

	led->vdd = devm_regulator_get(&pdev->dev, "vdd");
	if (IS_ERR(led->vdd)) {
		err = PTR_ERR(led->vdd);
		dev_err(led->dev, "Couldn't get regulator: %d", err);
		return err;
	}

	err = device_property_read_string(&pdev->dev, "label", &led->led.name);
	if (err) {
		dev_err(led->dev, "Couldn't read LED label: %d", err);
		return err;
	}

	if (led->info->init_mask) {
		err = regmap_update_bits(led->regmap, led->info->reg,
			led->info->init_mask, led->info->init_val);
		if (err) {
			dev_err(led->dev, "regmap failed: %d", err);
			return err;
		}
	}

	mutex_init(&led->update_lock);

	led->led.max_brightness = led->info->limit;
	led->led.brightness_set_blocking = cpcap_led_set;
	err = devm_led_classdev_register(&pdev->dev, &led->led);
	if (err) {
		dev_err(led->dev, "Couldn't register LED: %d", err);
		return err;
	}

	return 0;
}

static struct platform_driver cpcap_led_driver = {
	.probe = cpcap_led_probe,
	.driver = {
		.name = "cpcap-led",
		.of_match_table = cpcap_led_of_match,
	},
};
module_platform_driver(cpcap_led_driver);

MODULE_DESCRIPTION("CPCAP LED driver");
MODULE_AUTHOR("Sebastian Reichel <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
cd5e85f5	1	// SPDX-License-Identifier: GPL-2.0-or-later
cd3b0b05 SR	2	/*
cd3b0b05 SR	3	* Copyright (c) 2017 Sebastian Reichel <[email protected]>
cd3b0b05 SR	4	*/
	5
	6	#include <linux/leds.h>
	7	#include <linux/mfd/motorola-cpcap.h>
	8	#include <linux/module.h>
	9	#include <linux/mutex.h>
	10	#include <linux/of_device.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/regmap.h>
	13	#include <linux/regulator/consumer.h>
	14
	15	#define CPCAP_LED_NO_CURRENT 0x0001
	16
	17	struct cpcap_led_info {
	18	u16 reg;
	19	u16 mask;
	20	u16 limit;
	21	u16 init_mask;
	22	u16 init_val;
	23	};
	24
	25	static const struct cpcap_led_info cpcap_led_red = {
	26	.reg = CPCAP_REG_REDC,
	27	.mask = 0x03FF,
	28	.limit = 31,
	29	};
	30
	31	static const struct cpcap_led_info cpcap_led_green = {
	32	.reg = CPCAP_REG_GREENC,
	33	.mask = 0x03FF,
	34	.limit = 31,
	35	};
	36
	37	static const struct cpcap_led_info cpcap_led_blue = {
	38	.reg = CPCAP_REG_BLUEC,
	39	.mask = 0x03FF,
	40	.limit = 31,
	41	};
	42
	43	/* aux display light */
	44	static const struct cpcap_led_info cpcap_led_adl = {
	45	.reg = CPCAP_REG_ADLC,
	46	.mask = 0x000F,
	47	.limit = 1,
	48	.init_mask = 0x7FFF,
	49	.init_val = 0x5FF0,
	50	};
	51
	52	/* camera privacy led */
	53	static const struct cpcap_led_info cpcap_led_cp = {
	54	.reg = CPCAP_REG_CLEDC,
	55	.mask = 0x0007,
	56	.limit = 1,
	57	.init_mask = 0x03FF,
	58	.init_val = 0x0008,
	59	};
	60
	61	struct cpcap_led {
	62	struct led_classdev led;
	63	const struct cpcap_led_info *info;
	64	struct device *dev;
	65	struct regmap *regmap;
	66	struct mutex update_lock;
	67	struct regulator *vdd;
68	bool powered;
69
70	u32 current_limit;
71	};
72
73	static u16 cpcap_led_val(u8 current_limit, u8 duty_cycle)
74	{
75	current_limit &= 0x1f; /* 5 bit */
76	duty_cycle &= 0x0f; /* 4 bit */
77
78	return current_limit << 4 \| duty_cycle;
79	}
80
81	static int cpcap_led_set_power(struct cpcap_led *led, bool status)
82	{
83	int err;
84
85	if (status == led->powered)
86	return 0;
87
88	if (status)
89	err = regulator_enable(led->vdd);
90	else
91	err = regulator_disable(led->vdd);
92
93	if (err) {
94	dev_err(led->dev, "regulator failure: %d", err);
95	return err;
96	}
97
98	led->powered = status;
99
100	return 0;
101	}
102
103	static int cpcap_led_set(struct led_classdev *ledc, enum led_brightness value)
104	{
105	struct cpcap_led *led = container_of(ledc, struct cpcap_led, led);
106	int brightness;
107	int err;
108
109	mutex_lock(&led->update_lock);
110
111	if (value > LED_OFF) {
112	err = cpcap_led_set_power(led, true);
113	if (err)
114	goto exit;
115	}
116
117	if (value == LED_OFF) {
118	/* Avoid HW issue by turning off current before duty cycle */
119	err = regmap_update_bits(led->regmap,
120	led->info->reg, led->info->mask, CPCAP_LED_NO_CURRENT);
121	if (err) {
122	dev_err(led->dev, "regmap failed: %d", err);
123	goto exit;
124	}
125
126	brightness = cpcap_led_val(value, LED_OFF);
127	} else {
128	brightness = cpcap_led_val(value, LED_ON);
129	}
130
131	err = regmap_update_bits(led->regmap, led->info->reg, led->info->mask,
132	brightness);
133	if (err) {
134	dev_err(led->dev, "regmap failed: %d", err);
135	goto exit;
136	}
137
138	if (value == LED_OFF) {
139	err = cpcap_led_set_power(led, false);
140	if (err)
141	goto exit;
142	}
143
144	exit:
145	mutex_unlock(&led->update_lock);
146	return err;
147	}
148
149	static const struct of_device_id cpcap_led_of_match[] = {
150	{ .compatible = "motorola,cpcap-led-red", .data = &cpcap_led_red },
151	{ .compatible = "motorola,cpcap-led-green", .data = &cpcap_led_green },
152	{ .compatible = "motorola,cpcap-led-blue", .data = &cpcap_led_blue },
153	{ .compatible = "motorola,cpcap-led-adl", .data = &cpcap_led_adl },
154	{ .compatible = "motorola,cpcap-led-cp", .data = &cpcap_led_cp },
155	{},
156	};
157	MODULE_DEVICE_TABLE(of, cpcap_led_of_match);
158
159	static int cpcap_led_probe(struct platform_device *pdev)
160	{
161	const struct of_device_id *match;
162	struct cpcap_led *led;
163	int err;
164
165	match = of_match_device(of_match_ptr(cpcap_led_of_match), &pdev->dev);
166	if (!match \|\| !match->data)
167	return -EINVAL;
168
169	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
170	if (!led)
171	return -ENOMEM;
172	platform_set_drvdata(pdev, led);
173	led->info = match->data;
174	led->dev = &pdev->dev;
175
176	if (led->info->reg == 0x0000) {
177	dev_err(led->dev, "Unsupported LED");
178	return -ENODEV;
179	}
180
181	led->regmap = dev_get_regmap(pdev->dev.parent, NULL);
182	if (!led->regmap)
183	return -ENODEV;
184
185	led->vdd = devm_regulator_get(&pdev->dev, "vdd");
186	if (IS_ERR(led->vdd)) {
187	err = PTR_ERR(led->vdd);
188	dev_err(led->dev, "Couldn't get regulator: %d", err);
189	return err;
190	}
191
192	err = device_property_read_string(&pdev->dev, "label", &led->led.name);
193	if (err) {
194	dev_err(led->dev, "Couldn't read LED label: %d", err);
195	return err;
196	}
197
198	if (led->info->init_mask) {
199	err = regmap_update_bits(led->regmap, led->info->reg,
200	led->info->init_mask, led->info->init_val);
201	if (err) {
202	dev_err(led->dev, "regmap failed: %d", err);
203	return err;
204	}
205	}
206
207	mutex_init(&led->update_lock);
208
209	led->led.max_brightness = led->info->limit;
210	led->led.brightness_set_blocking = cpcap_led_set;
211	err = devm_led_classdev_register(&pdev->dev, &led->led);
212	if (err) {
213	dev_err(led->dev, "Couldn't register LED: %d", err);
214	return err;
215	}
216
217	return 0;
218	}
219
220	static struct platform_driver cpcap_led_driver = {
221	.probe = cpcap_led_probe,
222	.driver = {
223	.name = "cpcap-led",
224	.of_match_table = cpcap_led_of_match,
225	},
226	};
227	module_platform_driver(cpcap_led_driver);
228
229	MODULE_DESCRIPTION("CPCAP LED driver");
230	MODULE_AUTHOR("Sebastian Reichel <[email protected]>");
231	MODULE_LICENSE("GPL");