[mirror_ubuntu-zesty-kernel.git] / drivers / leds / leds-88pm860x.c

/*
 * LED driver for Marvell 88PM860x
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *	Haojian Zhuang <haojian.zhuang@marvell.com>
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>

#define LED_PWM_SHIFT		(3)
#define LED_PWM_MASK		(0x1F)
#define LED_CURRENT_MASK	(0x07 << 5)

#define LED_BLINK_ON_MASK	(0x07)
#define LED_BLINK_MASK		(0x7F)

#define LED_BLINK_ON(x)		((x & 0x7) * 66 + 66)
#define LED_BLINK_ON_MIN	LED_BLINK_ON(0)
#define LED_BLINK_ON_MAX	LED_BLINK_ON(0x7)
#define LED_ON_CONTINUOUS	(0x0F << 3)
#define LED_TO_ON(x)		((x - 66) / 66)

#define LED1_BLINK_EN		(1 << 1)
#define LED2_BLINK_EN		(1 << 2)

struct pm860x_led {
	struct led_classdev cdev;
	struct i2c_client *i2c;
	struct work_struct work;
	struct pm860x_chip *chip;
	struct mutex lock;
	char name[MFD_NAME_SIZE];

	int port;
	int iset;
	unsigned char brightness;
	unsigned char current_brightness;

	int blink_data;
	int blink_time;
	int blink_on;
	int blink_off;
};

/* return offset of color register */
static inline int __led_off(int port)
{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
		ret = port - PM8606_LED1_RED + PM8606_RGB1B;
		break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
		ret = port - PM8606_LED2_RED + PM8606_RGB2B;
		break;
	}
	return ret;
}

/* return offset of blink register */
static inline int __blink_off(int port)
{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
		ret = PM8606_RGB1A;
		break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
		ret = PM8606_RGB2A;
		break;
	}
	return ret;
}

static inline int __blink_ctl_mask(int port)
{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
		ret = LED1_BLINK_EN;
		break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
		ret = LED2_BLINK_EN;
		break;
	}
	return ret;
}

static int led_power_set(struct pm860x_chip *chip, int port, int on)
{
	int ret = -EINVAL;

	switch (port) {
	case PM8606_LED1_RED:
	case PM8606_LED1_GREEN:
	case PM8606_LED1_BLUE:
		ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
			pm8606_osc_disable(chip, RGB1_ENABLE);
		break;
	case PM8606_LED2_RED:
	case PM8606_LED2_GREEN:
	case PM8606_LED2_BLUE:
		ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
			pm8606_osc_disable(chip, RGB2_ENABLE);
		break;
	}
	return ret;
}

static void pm860x_led_work(struct work_struct *work)
{

	struct pm860x_led *led;
	struct pm860x_chip *chip;
	unsigned char buf[3];
	int mask, ret;

	led = container_of(work, struct pm860x_led, work);
	chip = led->chip;
	mutex_lock(&led->lock);
	if ((led->current_brightness == 0) && led->brightness) {
		led_power_set(chip, led->port, 1);
		if (led->iset) {
			pm860x_set_bits(led->i2c, __led_off(led->port),
					LED_CURRENT_MASK, led->iset);
		}
		pm860x_set_bits(led->i2c, __blink_off(led->port),
				LED_BLINK_MASK, LED_ON_CONTINUOUS);
		mask = __blink_ctl_mask(led->port);
		pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
	}
	pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
			led->brightness);

	if (led->brightness == 0) {
		pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
		ret = buf[0] & LED_PWM_MASK;
		ret |= buf[1] & LED_PWM_MASK;
		ret |= buf[2] & LED_PWM_MASK;
		if (ret == 0) {
			/* unset current since no led is lighting */
			pm860x_set_bits(led->i2c, __led_off(led->port),
					LED_CURRENT_MASK, 0);
			mask = __blink_ctl_mask(led->port);
			pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
			led_power_set(chip, led->port, 0);
		}
	}
	led->current_brightness = led->brightness;
	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
		__led_off(led->port), led->brightness);
	mutex_unlock(&led->lock);
}

static void pm860x_led_set(struct led_classdev *cdev,
			   enum led_brightness value)
{
	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);

	data->brightness = value >> 3;
	schedule_work(&data->work);
}

static int pm860x_led_probe(struct platform_device *pdev)
{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_led_pdata *pdata;
	struct pm860x_led *data;
	struct resource *res;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No I/O resource!\n");
		return -EINVAL;
	}

	pdata = pdev->dev.platform_data;
	if (pdata == NULL) {
		dev_err(&pdev->dev, "No platform data!\n");
		return -EINVAL;
	}

	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;
	strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
	dev_set_drvdata(&pdev->dev, data);
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	data->iset = pdata->iset;
	data->port = pdata->flags;
	if (data->port < 0) {
		dev_err(&pdev->dev, "check device failed\n");
		kfree(data);
		return -EINVAL;
	}

	data->current_brightness = 0;
	data->cdev.name = data->name;
	data->cdev.brightness_set = pm860x_led_set;
	mutex_init(&data->lock);
	INIT_WORK(&data->work, pm860x_led_work);

	ret = led_classdev_register(chip->dev, &data->cdev);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
		goto out;
	}
	pm860x_led_set(&data->cdev, 0);
	return 0;
out:
	kfree(data);
	return ret;
}

static int pm860x_led_remove(struct platform_device *pdev)
{
	struct pm860x_led *data = platform_get_drvdata(pdev);

	led_classdev_unregister(&data->cdev);
	kfree(data);

	return 0;
}

static struct platform_driver pm860x_led_driver = {
	.driver	= {
		.name	= "88pm860x-led",
		.owner	= THIS_MODULE,
	},
	.probe	= pm860x_led_probe,
	.remove	= pm860x_led_remove,
};

module_platform_driver(pm860x_led_driver);

MODULE_DESCRIPTION("LED driver for Marvell PM860x");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-led");
Commit	Line	Data
0a2f915b HZ	1	/*
	2	* LED driver for Marvell 88PM860x
	3	*
	4	* Copyright (C) 2009 Marvell International Ltd.
	5	* Haojian Zhuang <haojian.zhuang@marvell.com>
	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/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/i2c.h>
	17	#include <linux/leds.h>
5a0e3ad6	18	#include <linux/slab.h>
0a2f915b HZ	19	#include <linux/workqueue.h>
0a2f915b HZ	20	#include <linux/mfd/88pm860x.h>
54f4dedb	21	#include <linux/module.h>
0a2f915b HZ	22
	23	#define LED_PWM_SHIFT (3)
	24	#define LED_PWM_MASK (0x1F)
	25	#define LED_CURRENT_MASK (0x07 << 5)
	26
	27	#define LED_BLINK_ON_MASK (0x07)
0a2f915b HZ	28	#define LED_BLINK_MASK (0x7F)
	29
	30	#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
0a2f915b HZ	31	#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
0a2f915b HZ	32	#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
f5d59fc5	33	#define LED_ON_CONTINUOUS (0x0F << 3)
0a2f915b	34	#define LED_TO_ON(x) ((x - 66) / 66)
0a2f915b HZ	35
	36	#define LED1_BLINK_EN (1 << 1)
	37	#define LED2_BLINK_EN (1 << 2)
	38
0a2f915b HZ	39	struct pm860x_led {
	40	struct led_classdev cdev;
	41	struct i2c_client *i2c;
	42	struct work_struct work;
	43	struct pm860x_chip *chip;
	44	struct mutex lock;
	45	char name[MFD_NAME_SIZE];
	46
	47	int port;
	48	int iset;
0a2f915b HZ	49	unsigned char brightness;
	50	unsigned char current_brightness;
	51
	52	int blink_data;
	53	int blink_time;
	54	int blink_on;
	55	int blink_off;
	56	};
	57
	58	/* return offset of color register */
	59	static inline int __led_off(int port)
	60	{
	61	int ret = -EINVAL;
	62
	63	switch (port) {
	64	case PM8606_LED1_RED:
	65	case PM8606_LED1_GREEN:
	66	case PM8606_LED1_BLUE:
	67	ret = port - PM8606_LED1_RED + PM8606_RGB1B;
	68	break;
	69	case PM8606_LED2_RED:
	70	case PM8606_LED2_GREEN:
	71	case PM8606_LED2_BLUE:
	72	ret = port - PM8606_LED2_RED + PM8606_RGB2B;
	73	break;
	74	}
	75	return ret;
	76	}
	77
	78	/* return offset of blink register */
	79	static inline int __blink_off(int port)
	80	{
	81	int ret = -EINVAL;
	82
	83	switch (port) {
	84	case PM8606_LED1_RED:
	85	case PM8606_LED1_GREEN:
	86	case PM8606_LED1_BLUE:
	87	ret = PM8606_RGB1A;
f5d59fc5	88	break;
0a2f915b HZ	89	case PM8606_LED2_RED:
	90	case PM8606_LED2_GREEN:
	91	case PM8606_LED2_BLUE:
	92	ret = PM8606_RGB2A;
f5d59fc5	93	break;
0a2f915b HZ	94	}
	95	return ret;
	96	}
	97
	98	static inline int __blink_ctl_mask(int port)
	99	{
	100	int ret = -EINVAL;
	101
	102	switch (port) {
	103	case PM8606_LED1_RED:
	104	case PM8606_LED1_GREEN:
	105	case PM8606_LED1_BLUE:
	106	ret = LED1_BLINK_EN;
	107	break;
	108	case PM8606_LED2_RED:
	109	case PM8606_LED2_GREEN:
	110	case PM8606_LED2_BLUE:
	111	ret = LED2_BLINK_EN;
	112	break;
	113	}
	114	return ret;
	115	}
	116
b3b97473 JZ	117	static int led_power_set(struct pm860x_chip *chip, int port, int on)
	118	{
	119	int ret = -EINVAL;
	120
	121	switch (port) {
	122	case PM8606_LED1_RED:
	123	case PM8606_LED1_GREEN:
	124	case PM8606_LED1_BLUE:
	125	ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
	126	pm8606_osc_disable(chip, RGB1_ENABLE);
	127	break;
	128	case PM8606_LED2_RED:
	129	case PM8606_LED2_GREEN:
	130	case PM8606_LED2_BLUE:
	131	ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
	132	pm8606_osc_disable(chip, RGB2_ENABLE);
	133	break;
	134	}
	135	return ret;
	136	}
	137
f5d59fc5	138	static void pm860x_led_work(struct work_struct *work)
0a2f915b	139	{
0a2f915b	140
f5d59fc5 HZ	141	struct pm860x_led *led;
f5d59fc5 HZ	142	struct pm860x_chip *chip;
3154c344 HZ	143	unsigned char buf[3];
3154c344 HZ	144	int mask, ret;
f5d59fc5 HZ	145
	146	led = container_of(work, struct pm860x_led, work);
	147	chip = led->chip;
0a2f915b	148	mutex_lock(&led->lock);
f5d59fc5	149	if ((led->current_brightness == 0) && led->brightness) {
b3b97473	150	led_power_set(chip, led->port, 1);
f5d59fc5 HZ	151	if (led->iset) {
	152	pm860x_set_bits(led->i2c, __led_off(led->port),
	153	LED_CURRENT_MASK, led->iset);
0a2f915b	154	}
3154c344 HZ	155	pm860x_set_bits(led->i2c, __blink_off(led->port),
3154c344 HZ	156	LED_BLINK_MASK, LED_ON_CONTINUOUS);
0a2f915b	157	mask = __blink_ctl_mask(led->port);
f5d59fc5	158	pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
0a2f915b	159	}
f5d59fc5 HZ	160	pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
f5d59fc5 HZ	161	led->brightness);
3154c344 HZ	162
	163	if (led->brightness == 0) {
	164	pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
	165	ret = buf[0] & LED_PWM_MASK;
	166	ret \|= buf[1] & LED_PWM_MASK;
	167	ret \|= buf[2] & LED_PWM_MASK;
	168	if (ret == 0) {
	169	/* unset current since no led is lighting */
	170	pm860x_set_bits(led->i2c, __led_off(led->port),
	171	LED_CURRENT_MASK, 0);
	172	mask = __blink_ctl_mask(led->port);
	173	pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
b3b97473	174	led_power_set(chip, led->port, 0);
3154c344 HZ	175	}
3154c344 HZ	176	}
f5d59fc5 HZ	177	led->current_brightness = led->brightness;
	178	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
	179	__led_off(led->port), led->brightness);
0a2f915b	180	mutex_unlock(&led->lock);
0a2f915b HZ	181	}
	182
	183	static void pm860x_led_set(struct led_classdev *cdev,
	184	enum led_brightness value)
	185	{
	186	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
	187
0a2f915b	188	data->brightness = value >> 3;
0a2f915b	189	schedule_work(&data->work);
0a2f915b HZ	190	}
0a2f915b HZ	191
0a2f915b HZ	192	static int pm860x_led_probe(struct platform_device *pdev)
	193	{
	194	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
0a2f915b HZ	195	struct pm860x_led_pdata *pdata;
	196	struct pm860x_led *data;
	197	struct resource *res;
	198	int ret;
	199
	200	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	201	if (res == NULL) {
	202	dev_err(&pdev->dev, "No I/O resource!\n");
	203	return -EINVAL;
	204	}
	205
07259a70	206	pdata = pdev->dev.platform_data;
3154c344	207	if (pdata == NULL) {
f5d59fc5	208	dev_err(&pdev->dev, "No platform data!\n");
98652efc CF	209	return -EINVAL;
98652efc CF	210	}
0a2f915b HZ	211
	212	data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
	213	if (data == NULL)
	214	return -ENOMEM;
3154c344	215	strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
0a2f915b HZ	216	dev_set_drvdata(&pdev->dev, data);
	217	data->chip = chip;
	218	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	219	data->iset = pdata->iset;
3154c344	220	data->port = pdata->flags;
98652efc CF	221	if (data->port < 0) {
	222	dev_err(&pdev->dev, "check device failed\n");
	223	kfree(data);
0a2f915b	224	return -EINVAL;
98652efc	225	}
0a2f915b HZ	226
	227	data->current_brightness = 0;
	228	data->cdev.name = data->name;
	229	data->cdev.brightness_set = pm860x_led_set;
0a2f915b HZ	230	mutex_init(&data->lock);
	231	INIT_WORK(&data->work, pm860x_led_work);
	232
	233	ret = led_classdev_register(chip->dev, &data->cdev);
	234	if (ret < 0) {
	235	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
	236	goto out;
	237	}
3154c344	238	pm860x_led_set(&data->cdev, 0);
0a2f915b HZ	239	return 0;
	240	out:
	241	kfree(data);
	242	return ret;
	243	}
	244
	245	static int pm860x_led_remove(struct platform_device *pdev)
	246	{
	247	struct pm860x_led *data = platform_get_drvdata(pdev);
	248
	249	led_classdev_unregister(&data->cdev);
	250	kfree(data);
	251
	252	return 0;
	253	}
	254
	255	static struct platform_driver pm860x_led_driver = {
	256	.driver = {
	257	.name = "88pm860x-led",
	258	.owner = THIS_MODULE,
	259	},
	260	.probe = pm860x_led_probe,
	261	.remove = pm860x_led_remove,
	262	};
	263
892a8843	264	module_platform_driver(pm860x_led_driver);
0a2f915b HZ	265
	266	MODULE_DESCRIPTION("LED driver for Marvell PM860x");
	267	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	268	MODULE_LICENSE("GPL");
	269	MODULE_ALIAS("platform:88pm860x-led");