[linux.git] / drivers / leds / leds-max8997.c

/*
 * leds-max8997.c - LED class driver for MAX8997 LEDs.
 *
 * Copyright (C) 2011 Samsung Electronics
 * Donggeun Kim <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/platform_device.h>

#define MAX8997_LED_FLASH_SHIFT			3
#define MAX8997_LED_FLASH_CUR_MASK		0xf8
#define MAX8997_LED_MOVIE_SHIFT			4
#define MAX8997_LED_MOVIE_CUR_MASK		0xf0

#define MAX8997_LED_FLASH_MAX_BRIGHTNESS	0x1f
#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS	0xf
#define MAX8997_LED_NONE_MAX_BRIGHTNESS		0

#define MAX8997_LED0_FLASH_MASK			0x1
#define MAX8997_LED0_FLASH_PIN_MASK		0x5
#define MAX8997_LED0_MOVIE_MASK			0x8
#define MAX8997_LED0_MOVIE_PIN_MASK		0x28

#define MAX8997_LED1_FLASH_MASK			0x2
#define MAX8997_LED1_FLASH_PIN_MASK		0x6
#define MAX8997_LED1_MOVIE_MASK			0x10
#define MAX8997_LED1_MOVIE_PIN_MASK		0x30

#define MAX8997_LED_BOOST_ENABLE_MASK		(1 << 6)

struct max8997_led {
	struct max8997_dev *iodev;
	struct led_classdev cdev;
	bool enabled;
	int id;
	enum max8997_led_mode led_mode;
	struct mutex mutex;
};

static void max8997_led_set_mode(struct max8997_led *led,
			enum max8997_led_mode mode)
{
	int ret;
	struct i2c_client *client = led->iodev->i2c;
	u8 mask = 0, val;

	switch (mode) {
	case MAX8997_FLASH_MODE:
		mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
		val = led->id ?
		      MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
		led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
		break;
	case MAX8997_MOVIE_MODE:
		mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
		val = led->id ?
		      MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
		led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
		break;
	case MAX8997_FLASH_PIN_CONTROL_MODE:
		mask = MAX8997_LED1_FLASH_PIN_MASK |
		       MAX8997_LED0_FLASH_PIN_MASK;
		val = led->id ?
		      MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
		led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
		break;
	case MAX8997_MOVIE_PIN_CONTROL_MODE:
		mask = MAX8997_LED1_MOVIE_PIN_MASK |
		       MAX8997_LED0_MOVIE_PIN_MASK;
		val = led->id ?
		      MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
		led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
		break;
	default:
		led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
		break;
	}

	if (mask) {
		ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
					 mask);
		if (ret)
			dev_err(led->iodev->dev,
				"failed to update register(%d)\n", ret);
	}

	led->led_mode = mode;
}

static void max8997_led_enable(struct max8997_led *led, bool enable)
{
	int ret;
	struct i2c_client *client = led->iodev->i2c;
	u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;

	if (led->enabled == enable)
		return;

	val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;

	ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
	if (ret)
		dev_err(led->iodev->dev,
			"failed to update register(%d)\n", ret);

	led->enabled = enable;
}

static void max8997_led_set_current(struct max8997_led *led,
				enum led_brightness value)
{
	int ret;
	struct i2c_client *client = led->iodev->i2c;
	u8 val = 0, mask = 0, reg = 0;

	switch (led->led_mode) {
	case MAX8997_FLASH_MODE:
	case MAX8997_FLASH_PIN_CONTROL_MODE:
		val = value << MAX8997_LED_FLASH_SHIFT;
		mask = MAX8997_LED_FLASH_CUR_MASK;
		reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
		break;
	case MAX8997_MOVIE_MODE:
	case MAX8997_MOVIE_PIN_CONTROL_MODE:
		val = value << MAX8997_LED_MOVIE_SHIFT;
		mask = MAX8997_LED_MOVIE_CUR_MASK;
		reg = MAX8997_REG_MOVIE_CUR;
		break;
	default:
		break;
	}

	if (mask) {
		ret = max8997_update_reg(client, reg, val, mask);
		if (ret)
			dev_err(led->iodev->dev,
				"failed to update register(%d)\n", ret);
	}
}

static void max8997_led_brightness_set(struct led_classdev *led_cdev,
				enum led_brightness value)
{
	struct max8997_led *led =
			container_of(led_cdev, struct max8997_led, cdev);

	if (value) {
		max8997_led_set_current(led, value);
		max8997_led_enable(led, true);
	} else {
		max8997_led_set_current(led, value);
		max8997_led_enable(led, false);
	}
}

static ssize_t max8997_led_show_mode(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct max8997_led *led =
			container_of(led_cdev, struct max8997_led, cdev);
	ssize_t ret = 0;

	mutex_lock(&led->mutex);

	switch (led->led_mode) {
	case MAX8997_FLASH_MODE:
		ret += sprintf(buf, "FLASH\n");
		break;
	case MAX8997_MOVIE_MODE:
		ret += sprintf(buf, "MOVIE\n");
		break;
	case MAX8997_FLASH_PIN_CONTROL_MODE:
		ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
		break;
	case MAX8997_MOVIE_PIN_CONTROL_MODE:
		ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
		break;
	default:
		ret += sprintf(buf, "NONE\n");
		break;
	}

	mutex_unlock(&led->mutex);

	return ret;
}

static ssize_t max8997_led_store_mode(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t size)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct max8997_led *led =
			container_of(led_cdev, struct max8997_led, cdev);
	enum max8997_led_mode mode;

	mutex_lock(&led->mutex);

	if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
		mode = MAX8997_FLASH_PIN_CONTROL_MODE;
	else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
		mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
	else if (!strncmp(buf, "FLASH", 5))
		mode = MAX8997_FLASH_MODE;
	else if (!strncmp(buf, "MOVIE", 5))
		mode = MAX8997_MOVIE_MODE;
	else
		mode = MAX8997_NONE;

	max8997_led_set_mode(led, mode);

	mutex_unlock(&led->mutex);

	return size;
}

static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);

static struct attribute *max8997_attrs[] = {
	&dev_attr_mode.attr,
	NULL
};
ATTRIBUTE_GROUPS(max8997);

static int max8997_led_probe(struct platform_device *pdev)
{
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct max8997_led *led;
	char name[20];
	int ret = 0;

	if (pdata == NULL) {
		dev_err(&pdev->dev, "no platform data\n");
		return -ENODEV;
	}

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

	led->id = pdev->id;
	snprintf(name, sizeof(name), "max8997-led%d", pdev->id);

	led->cdev.name = name;
	led->cdev.brightness_set = max8997_led_brightness_set;
	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
	led->cdev.brightness = 0;
	led->cdev.groups = max8997_groups;
	led->iodev = iodev;

	/* initialize mode and brightness according to platform_data */
	if (pdata->led_pdata) {
		u8 mode = 0, brightness = 0;

		mode = pdata->led_pdata->mode[led->id];
		brightness = pdata->led_pdata->brightness[led->id];

		max8997_led_set_mode(led, mode);

		if (brightness > led->cdev.max_brightness)
			brightness = led->cdev.max_brightness;
		max8997_led_set_current(led, brightness);
		led->cdev.brightness = brightness;
	} else {
		max8997_led_set_mode(led, MAX8997_NONE);
		max8997_led_set_current(led, 0);
	}

	mutex_init(&led->mutex);

	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
	if (ret < 0)
		return ret;

	return 0;
}

static struct platform_driver max8997_led_driver = {
	.driver = {
		.name  = "max8997-led",
	},
	.probe  = max8997_led_probe,
};

module_platform_driver(max8997_led_driver);

MODULE_AUTHOR("Donggeun Kim <[email protected]>");
MODULE_DESCRIPTION("MAX8997 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8997-led");
Commit	Line	Data
8584cb82 DK	1	/*
	2	* leds-max8997.c - LED class driver for MAX8997 LEDs.
	3	*
	4	* Copyright (C) 2011 Samsung Electronics
	5	* Donggeun Kim <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/err.h>
	15	#include <linux/slab.h>
8584cb82 DK	16	#include <linux/leds.h>
	17	#include <linux/mfd/max8997.h>
	18	#include <linux/mfd/max8997-private.h>
	19	#include <linux/platform_device.h>
	20
	21	#define MAX8997_LED_FLASH_SHIFT 3
	22	#define MAX8997_LED_FLASH_CUR_MASK 0xf8
	23	#define MAX8997_LED_MOVIE_SHIFT 4
	24	#define MAX8997_LED_MOVIE_CUR_MASK 0xf0
	25
	26	#define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
	27	#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
	28	#define MAX8997_LED_NONE_MAX_BRIGHTNESS 0
	29
	30	#define MAX8997_LED0_FLASH_MASK 0x1
	31	#define MAX8997_LED0_FLASH_PIN_MASK 0x5
	32	#define MAX8997_LED0_MOVIE_MASK 0x8
	33	#define MAX8997_LED0_MOVIE_PIN_MASK 0x28
	34
	35	#define MAX8997_LED1_FLASH_MASK 0x2
	36	#define MAX8997_LED1_FLASH_PIN_MASK 0x6
	37	#define MAX8997_LED1_MOVIE_MASK 0x10
	38	#define MAX8997_LED1_MOVIE_PIN_MASK 0x30
	39
	40	#define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)
	41
	42	struct max8997_led {
	43	struct max8997_dev *iodev;
	44	struct led_classdev cdev;
	45	bool enabled;
	46	int id;
	47	enum max8997_led_mode led_mode;
	48	struct mutex mutex;
	49	};
	50
8584cb82 DK	51	static void max8997_led_set_mode(struct max8997_led *led,
	52	enum max8997_led_mode mode)
	53	{
	54	int ret;
	55	struct i2c_client *client = led->iodev->i2c;
eb18618b	56	u8 mask = 0, val;
8584cb82 DK	57
	58	switch (mode) {
	59	case MAX8997_FLASH_MODE:
eb18618b AL	60	mask = MAX8997_LED1_FLASH_MASK \| MAX8997_LED0_FLASH_MASK;
eb18618b AL	61	val = led->id ?
8584cb82 DK	62	MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
	63	led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
	64	break;
	65	case MAX8997_MOVIE_MODE:
eb18618b AL	66	mask = MAX8997_LED1_MOVIE_MASK \| MAX8997_LED0_MOVIE_MASK;
eb18618b AL	67	val = led->id ?
8584cb82 DK	68	MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
	69	led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
	70	break;
	71	case MAX8997_FLASH_PIN_CONTROL_MODE:
eb18618b AL	72	mask = MAX8997_LED1_FLASH_PIN_MASK \|
	73	MAX8997_LED0_FLASH_PIN_MASK;
	74	val = led->id ?
8584cb82 DK	75	MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
	76	led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
	77	break;
	78	case MAX8997_MOVIE_PIN_CONTROL_MODE:
eb18618b AL	79	mask = MAX8997_LED1_MOVIE_PIN_MASK \|
	80	MAX8997_LED0_MOVIE_PIN_MASK;
	81	val = led->id ?
8584cb82 DK	82	MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
	83	led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
	84	break;
	85	default:
	86	led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
	87	break;
	88	}
	89
	90	if (mask) {
eb18618b AL	91	ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
eb18618b AL	92	mask);
8584cb82 DK	93	if (ret)
	94	dev_err(led->iodev->dev,
	95	"failed to update register(%d)\n", ret);
	96	}
	97
	98	led->led_mode = mode;
	99	}
	100
	101	static void max8997_led_enable(struct max8997_led *led, bool enable)
	102	{
	103	int ret;
	104	struct i2c_client *client = led->iodev->i2c;
	105	u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
	106
	107	if (led->enabled == enable)
	108	return;
	109
	110	val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
	111
	112	ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
	113	if (ret)
	114	dev_err(led->iodev->dev,
	115	"failed to update register(%d)\n", ret);
	116
	117	led->enabled = enable;
	118	}
	119
	120	static void max8997_led_set_current(struct max8997_led *led,
	121	enum led_brightness value)
	122	{
	123	int ret;
	124	struct i2c_client *client = led->iodev->i2c;
	125	u8 val = 0, mask = 0, reg = 0;
	126
	127	switch (led->led_mode) {
	128	case MAX8997_FLASH_MODE:
	129	case MAX8997_FLASH_PIN_CONTROL_MODE:
	130	val = value << MAX8997_LED_FLASH_SHIFT;
	131	mask = MAX8997_LED_FLASH_CUR_MASK;
	132	reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
	133	break;
	134	case MAX8997_MOVIE_MODE:
	135	case MAX8997_MOVIE_PIN_CONTROL_MODE:
	136	val = value << MAX8997_LED_MOVIE_SHIFT;
	137	mask = MAX8997_LED_MOVIE_CUR_MASK;
	138	reg = MAX8997_REG_MOVIE_CUR;
	139	break;
	140	default:
	141	break;
	142	}
	143
	144	if (mask) {
	145	ret = max8997_update_reg(client, reg, val, mask);
	146	if (ret)
	147	dev_err(led->iodev->dev,
	148	"failed to update register(%d)\n", ret);
	149	}
	150	}
	151
	152	static void max8997_led_brightness_set(struct led_classdev *led_cdev,
	153	enum led_brightness value)
	154	{
	155	struct max8997_led *led =
	156	container_of(led_cdev, struct max8997_led, cdev);
157
158	if (value) {
159	max8997_led_set_current(led, value);
160	max8997_led_enable(led, true);
161	} else {
162	max8997_led_set_current(led, value);
163	max8997_led_enable(led, false);
164	}
165	}
166
167	static ssize_t max8997_led_show_mode(struct device *dev,
168	struct device_attribute attr, char buf)
169	{
170	struct led_classdev *led_cdev = dev_get_drvdata(dev);
171	struct max8997_led *led =
172	container_of(led_cdev, struct max8997_led, cdev);
173	ssize_t ret = 0;
174
175	mutex_lock(&led->mutex);
176
177	switch (led->led_mode) {
178	case MAX8997_FLASH_MODE:
179	ret += sprintf(buf, "FLASH\n");
180	break;
181	case MAX8997_MOVIE_MODE:
182	ret += sprintf(buf, "MOVIE\n");
183	break;
184	case MAX8997_FLASH_PIN_CONTROL_MODE:
185	ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
186	break;
187	case MAX8997_MOVIE_PIN_CONTROL_MODE:
188	ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
189	break;
190	default:
191	ret += sprintf(buf, "NONE\n");
192	break;
193	}
194
195	mutex_unlock(&led->mutex);
196
197	return ret;
198	}
199
200	static ssize_t max8997_led_store_mode(struct device *dev,
201	struct device_attribute *attr,
202	const char *buf, size_t size)
203	{
204	struct led_classdev *led_cdev = dev_get_drvdata(dev);
205	struct max8997_led *led =
206	container_of(led_cdev, struct max8997_led, cdev);
207	enum max8997_led_mode mode;
208
209	mutex_lock(&led->mutex);
210
211	if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
212	mode = MAX8997_FLASH_PIN_CONTROL_MODE;
213	else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
214	mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
215	else if (!strncmp(buf, "FLASH", 5))
216	mode = MAX8997_FLASH_MODE;
217	else if (!strncmp(buf, "MOVIE", 5))
218	mode = MAX8997_MOVIE_MODE;
219	else
220	mode = MAX8997_NONE;
221
222	max8997_led_set_mode(led, mode);
223
224	mutex_unlock(&led->mutex);
225
226	return size;
227	}
228
229	static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
230
35c16499 JH	231	static struct attribute *max8997_attrs[] = {
	232	&dev_attr_mode.attr,
	233	NULL
	234	};
	235	ATTRIBUTE_GROUPS(max8997);
	236
98ea1ea2	237	static int max8997_led_probe(struct platform_device *pdev)
8584cb82 DK	238	{
	239	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	240	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
	241	struct max8997_led *led;
	242	char name[20];
	243	int ret = 0;
	244
	245	if (pdata == NULL) {
	246	dev_err(&pdev->dev, "no platform data\n");
	247	return -ENODEV;
	248	}
	249
7f13bbf7 SK	250	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
	251	if (led == NULL)
	252	return -ENOMEM;
8584cb82 DK	253
	254	led->id = pdev->id;
	255	snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
	256
	257	led->cdev.name = name;
	258	led->cdev.brightness_set = max8997_led_brightness_set;
	259	led->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	260	led->cdev.brightness = 0;
35c16499	261	led->cdev.groups = max8997_groups;
8584cb82 DK	262	led->iodev = iodev;
	263
	264	/* initialize mode and brightness according to platform_data */
	265	if (pdata->led_pdata) {
	266	u8 mode = 0, brightness = 0;
	267
	268	mode = pdata->led_pdata->mode[led->id];
	269	brightness = pdata->led_pdata->brightness[led->id];
	270
7a5de56d	271	max8997_led_set_mode(led, mode);
8584cb82 DK	272
	273	if (brightness > led->cdev.max_brightness)
	274	brightness = led->cdev.max_brightness;
	275	max8997_led_set_current(led, brightness);
	276	led->cdev.brightness = brightness;
	277	} else {
	278	max8997_led_set_mode(led, MAX8997_NONE);
	279	max8997_led_set_current(led, 0);
	280	}
	281
	282	mutex_init(&led->mutex);
	283
1c430f90	284	ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
8584cb82	285	if (ret < 0)
7f13bbf7	286	return ret;
8584cb82	287
8584cb82	288	return 0;
8584cb82 DK	289	}
8584cb82 DK	290
8584cb82 DK	291	static struct platform_driver max8997_led_driver = {
	292	.driver = {
	293	.name = "max8997-led",
8584cb82 DK	294	},
8584cb82 DK	295	.probe = max8997_led_probe,
8584cb82 DK	296	};
8584cb82 DK	297
7fafefb8	298	module_platform_driver(max8997_led_driver);
8584cb82 DK	299
	300	MODULE_AUTHOR("Donggeun Kim <[email protected]>");
	301	MODULE_DESCRIPTION("MAX8997 LED driver");
	302	MODULE_LICENSE("GPL");
	303	MODULE_ALIAS("platform:max8997-led");