[linux.git] / drivers / leds / leds-pm8058.c

/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>

#define PM8058_LED_TYPE_COMMON	0x00
#define PM8058_LED_TYPE_KEYPAD	0x01
#define PM8058_LED_TYPE_FLASH	0x02

#define PM8058_LED_TYPE_COMMON_MASK	0xf8
#define PM8058_LED_TYPE_KEYPAD_MASK	0xf0
#define PM8058_LED_TYPE_COMMON_SHIFT	3
#define PM8058_LED_TYPE_KEYPAD_SHIFT	4

struct pm8058_led {
	struct regmap *map;
	u32 reg;
	u32 ledtype;
	struct led_classdev cdev;
};

static void pm8058_led_set(struct led_classdev *cled,
	enum led_brightness value)
{
	struct pm8058_led *led;
	int ret = 0;
	unsigned int mask = 0;
	unsigned int val = 0;

	led = container_of(cled, struct pm8058_led, cdev);
	switch (led->ledtype) {
	case PM8058_LED_TYPE_COMMON:
		mask = PM8058_LED_TYPE_COMMON_MASK;
		val = value << PM8058_LED_TYPE_COMMON_SHIFT;
		break;
	case PM8058_LED_TYPE_KEYPAD:
	case PM8058_LED_TYPE_FLASH:
		mask = PM8058_LED_TYPE_KEYPAD_MASK;
		val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
		break;
	default:
		break;
	}

	ret = regmap_update_bits(led->map, led->reg, mask, val);
	if (ret)
		pr_err("Failed to set LED brightness\n");
}

static enum led_brightness pm8058_led_get(struct led_classdev *cled)
{
	struct pm8058_led *led;
	int ret;
	unsigned int val;

	led = container_of(cled, struct pm8058_led, cdev);

	ret = regmap_read(led->map, led->reg, &val);
	if (ret) {
		pr_err("Failed to get LED brightness\n");
		return LED_OFF;
	}

	switch (led->ledtype) {
	case PM8058_LED_TYPE_COMMON:
		val &= PM8058_LED_TYPE_COMMON_MASK;
		val >>= PM8058_LED_TYPE_COMMON_SHIFT;
		break;
	case PM8058_LED_TYPE_KEYPAD:
	case PM8058_LED_TYPE_FLASH:
		val &= PM8058_LED_TYPE_KEYPAD_MASK;
		val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
		break;
	default:
		val = LED_OFF;
		break;
	}

	return val;
}

static int pm8058_led_probe(struct platform_device *pdev)
{
	struct pm8058_led *led;
	struct device_node *np = pdev->dev.of_node;
	int ret;
	struct regmap *map;
	const char *state;
	enum led_brightness maxbright;

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

	led->ledtype = (u32)of_device_get_match_data(&pdev->dev);

	map = dev_get_regmap(pdev->dev.parent, NULL);
	if (!map) {
		dev_err(&pdev->dev, "Parent regmap unavailable.\n");
		return -ENXIO;
	}
	led->map = map;

	ret = of_property_read_u32(np, "reg", &led->reg);
	if (ret) {
		dev_err(&pdev->dev, "no register offset specified\n");
		return -EINVAL;
	}

	/* Use label else node name */
	led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
	led->cdev.default_trigger =
		of_get_property(np, "linux,default-trigger", NULL);
	led->cdev.brightness_set = pm8058_led_set;
	led->cdev.brightness_get = pm8058_led_get;
	if (led->ledtype == PM8058_LED_TYPE_COMMON)
		maxbright = 31; /* 5 bits */
	else
		maxbright = 15; /* 4 bits */
	led->cdev.max_brightness = maxbright;

	state = of_get_property(np, "default-state", NULL);
	if (state) {
		if (!strcmp(state, "keep")) {
			led->cdev.brightness = pm8058_led_get(&led->cdev);
		} else if (!strcmp(state, "on")) {
			led->cdev.brightness = maxbright;
			pm8058_led_set(&led->cdev, maxbright);
		} else {
			led->cdev.brightness = LED_OFF;
			pm8058_led_set(&led->cdev, LED_OFF);
		}
	}

	if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
	    led->ledtype == PM8058_LED_TYPE_FLASH)
		led->cdev.flags	= LED_CORE_SUSPENDRESUME;

	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
	if (ret) {
		dev_err(&pdev->dev, "unable to register led \"%s\"\n",
			led->cdev.name);
		return ret;
	}

	return 0;
}

static const struct of_device_id pm8058_leds_id_table[] = {
	{
		.compatible = "qcom,pm8058-led",
		.data = (void *)PM8058_LED_TYPE_COMMON
	},
	{
		.compatible = "qcom,pm8058-keypad-led",
		.data = (void *)PM8058_LED_TYPE_KEYPAD
	},
	{
		.compatible = "qcom,pm8058-flash-led",
		.data = (void *)PM8058_LED_TYPE_FLASH
	},
	{ },
};
MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);

static struct platform_driver pm8058_led_driver = {
	.probe		= pm8058_led_probe,
	.driver		= {
		.name	= "pm8058-leds",
		.of_match_table = pm8058_leds_id_table,
	},
};
module_platform_driver(pm8058_led_driver);

MODULE_DESCRIPTION("PM8058 LEDs driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pm8058-leds");
Commit	Line	Data
7f866986 LW	1	/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*/
	12	#include <linux/leds.h>
	13	#include <linux/module.h>
	14	#include <linux/of.h>
	15	#include <linux/of_device.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/pm.h>
	18	#include <linux/regmap.h>
	19
	20	#define PM8058_LED_TYPE_COMMON 0x00
	21	#define PM8058_LED_TYPE_KEYPAD 0x01
	22	#define PM8058_LED_TYPE_FLASH 0x02
	23
	24	#define PM8058_LED_TYPE_COMMON_MASK 0xf8
	25	#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
	26	#define PM8058_LED_TYPE_COMMON_SHIFT 3
	27	#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
	28
	29	struct pm8058_led {
	30	struct regmap *map;
	31	u32 reg;
	32	u32 ledtype;
	33	struct led_classdev cdev;
	34	};
	35
	36	static void pm8058_led_set(struct led_classdev *cled,
	37	enum led_brightness value)
	38	{
	39	struct pm8058_led *led;
	40	int ret = 0;
	41	unsigned int mask = 0;
	42	unsigned int val = 0;
	43
	44	led = container_of(cled, struct pm8058_led, cdev);
	45	switch (led->ledtype) {
	46	case PM8058_LED_TYPE_COMMON:
	47	mask = PM8058_LED_TYPE_COMMON_MASK;
	48	val = value << PM8058_LED_TYPE_COMMON_SHIFT;
	49	break;
	50	case PM8058_LED_TYPE_KEYPAD:
	51	case PM8058_LED_TYPE_FLASH:
	52	mask = PM8058_LED_TYPE_KEYPAD_MASK;
	53	val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
	54	break;
	55	default:
	56	break;
	57	}
	58
	59	ret = regmap_update_bits(led->map, led->reg, mask, val);
	60	if (ret)
	61	pr_err("Failed to set LED brightness\n");
	62	}
	63
	64	static enum led_brightness pm8058_led_get(struct led_classdev *cled)
65	{
66	struct pm8058_led *led;
67	int ret;
68	unsigned int val;
69
70	led = container_of(cled, struct pm8058_led, cdev);
71
72	ret = regmap_read(led->map, led->reg, &val);
73	if (ret) {
74	pr_err("Failed to get LED brightness\n");
75	return LED_OFF;
76	}
77
78	switch (led->ledtype) {
79	case PM8058_LED_TYPE_COMMON:
80	val &= PM8058_LED_TYPE_COMMON_MASK;
81	val >>= PM8058_LED_TYPE_COMMON_SHIFT;
82	break;
83	case PM8058_LED_TYPE_KEYPAD:
84	case PM8058_LED_TYPE_FLASH:
85	val &= PM8058_LED_TYPE_KEYPAD_MASK;
86	val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
87	break;
88	default:
89	val = LED_OFF;
90	break;
91	}
92
93	return val;
94	}
95
96	static int pm8058_led_probe(struct platform_device *pdev)
97	{
98	struct pm8058_led *led;
99	struct device_node *np = pdev->dev.of_node;
100	int ret;
101	struct regmap *map;
102	const char *state;
103	enum led_brightness maxbright;
104
105	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
106	if (!led)
107	return -ENOMEM;
108
109	led->ledtype = (u32)of_device_get_match_data(&pdev->dev);
110
111	map = dev_get_regmap(pdev->dev.parent, NULL);
112	if (!map) {
113	dev_err(&pdev->dev, "Parent regmap unavailable.\n");
114	return -ENXIO;
115	}
116	led->map = map;
117
118	ret = of_property_read_u32(np, "reg", &led->reg);
119	if (ret) {
120	dev_err(&pdev->dev, "no register offset specified\n");
121	return -EINVAL;
122	}
123
124	/* Use label else node name */
125	led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
126	led->cdev.default_trigger =
127	of_get_property(np, "linux,default-trigger", NULL);
128	led->cdev.brightness_set = pm8058_led_set;
129	led->cdev.brightness_get = pm8058_led_get;
130	if (led->ledtype == PM8058_LED_TYPE_COMMON)
131	maxbright = 31; /* 5 bits */
132	else
133	maxbright = 15; /* 4 bits */
134	led->cdev.max_brightness = maxbright;
135
136	state = of_get_property(np, "default-state", NULL);
137	if (state) {
138	if (!strcmp(state, "keep")) {
139	led->cdev.brightness = pm8058_led_get(&led->cdev);
140	} else if (!strcmp(state, "on")) {
141	led->cdev.brightness = maxbright;
142	pm8058_led_set(&led->cdev, maxbright);
143	} else {
144	led->cdev.brightness = LED_OFF;
145	pm8058_led_set(&led->cdev, LED_OFF);
146	}
147	}
148
149	if (led->ledtype == PM8058_LED_TYPE_KEYPAD \|\|
150	led->ledtype == PM8058_LED_TYPE_FLASH)
151	led->cdev.flags = LED_CORE_SUSPENDRESUME;
152
153	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
154	if (ret) {
155	dev_err(&pdev->dev, "unable to register led \"%s\"\n",
156	led->cdev.name);
157	return ret;
158	}
159
160	return 0;
161	}
162
163	static const struct of_device_id pm8058_leds_id_table[] = {
164	{
165	.compatible = "qcom,pm8058-led",
166	.data = (void *)PM8058_LED_TYPE_COMMON
167	},
168	{
169	.compatible = "qcom,pm8058-keypad-led",
170	.data = (void *)PM8058_LED_TYPE_KEYPAD
171	},
172	{
173	.compatible = "qcom,pm8058-flash-led",
174	.data = (void *)PM8058_LED_TYPE_FLASH
175	},
176	{ },
177	};
178	MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
179
180	static struct platform_driver pm8058_led_driver = {
181	.probe = pm8058_led_probe,
182	.driver = {
183	.name = "pm8058-leds",
184	.of_match_table = pm8058_leds_id_table,
185	},
186	};
187	module_platform_driver(pm8058_led_driver);
188
189	MODULE_DESCRIPTION("PM8058 LEDs driver");
190	MODULE_LICENSE("GPL v2");
191	MODULE_ALIAS("platform:pm8058-leds");