[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/of.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_MASK		(0x1F)
#define LED_CURRENT_MASK	(0x07 << 5)

#define LED_BLINK_MASK		(0x7F)

#define LED_ON_CONTINUOUS	(0x0F << 3)

#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 reg_control;
	int reg_blink;
	int blink_mask;
};

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

	switch (port) {
	case 0:
	case 1:
	case 2:
		ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
			pm8606_osc_disable(chip, RGB1_ENABLE);
		break;
	case 3:
	case 4:
	case 5:
		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 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->reg_control,
					LED_CURRENT_MASK, led->iset);
		}
		pm860x_set_bits(led->i2c, led->reg_blink,
				LED_BLINK_MASK, LED_ON_CONTINUOUS);
		pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
				led->blink_mask);
	}
	pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
			led->brightness);

	if (led->brightness == 0) {
		pm860x_bulk_read(led->i2c, led->reg_control, 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->reg_control,
					LED_CURRENT_MASK, 0);
			pm860x_set_bits(led->i2c, PM8606_WLED3B,
					led->blink_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->reg_control, 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);
}

#ifdef CONFIG_OF
static int pm860x_led_dt_init(struct platform_device *pdev,
			      struct pm860x_led *data)
{
	struct device_node *nproot, *np;
	int iset = 0;

	if (!pdev->dev.parent->of_node)
		return -ENODEV;
	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
	if (!nproot) {
		dev_err(&pdev->dev, "failed to find leds node\n");
		return -ENODEV;
	}
	for_each_child_of_node(nproot, np) {
		if (!of_node_cmp(np->name, data->name)) {
			of_property_read_u32(np, "marvell,88pm860x-iset",
					     &iset);
			data->iset = PM8606_LED_CURRENT(iset);
			of_node_put(np);
			break;
		}
	}
	of_node_put(nproot);
	return 0;
}
#else
#define pm860x_led_dt_init(x, y)	(-1)
#endif

static int pm860x_led_probe(struct platform_device *pdev)
{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct pm860x_led *data;
	struct resource *res;
	int ret = 0;

	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
	if (!res) {
		dev_err(&pdev->dev, "No REG resource for control\n");
		return -ENXIO;
	}
	data->reg_control = res->start;
	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
	if (!res) {
		dev_err(&pdev->dev, "No REG resource for blink\n");
		return -ENXIO;
	}
	data->reg_blink = res->start;
	memset(data->name, 0, MFD_NAME_SIZE);
	switch (pdev->id) {
	case 0:
		data->blink_mask = LED1_BLINK_EN;
		sprintf(data->name, "led0-red");
		break;
	case 1:
		data->blink_mask = LED1_BLINK_EN;
		sprintf(data->name, "led0-green");
		break;
	case 2:
		data->blink_mask = LED1_BLINK_EN;
		sprintf(data->name, "led0-blue");
		break;
	case 3:
		data->blink_mask = LED2_BLINK_EN;
		sprintf(data->name, "led1-red");
		break;
	case 4:
		data->blink_mask = LED2_BLINK_EN;
		sprintf(data->name, "led1-green");
		break;
	case 5:
		data->blink_mask = LED2_BLINK_EN;
		sprintf(data->name, "led1-blue");
		break;
	}
	platform_set_drvdata(pdev, data);
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
	data->port = pdev->id;
	if (pm860x_led_dt_init(pdev, data))
		if (pdata)
			data->iset = pdata->iset;

	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);
		return ret;
	}
	pm860x_led_set(&data->cdev, 0);
	return 0;
}

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

	led_classdev_unregister(&data->cdev);

	return 0;
}

static struct platform_driver pm860x_led_driver = {
	.driver	= {
		.name	= "88pm860x-led",
	},
	.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>
2e57d567	14	#include <linux/of.h>
0a2f915b HZ	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	22
0a2f915b HZ	23	#define LED_PWM_MASK (0x1F)
	24	#define LED_CURRENT_MASK (0x07 << 5)
	25
0a2f915b HZ	26	#define LED_BLINK_MASK (0x7F)
0a2f915b HZ	27
f5d59fc5	28	#define LED_ON_CONTINUOUS (0x0F << 3)
0a2f915b HZ	29
	30	#define LED1_BLINK_EN (1 << 1)
	31	#define LED2_BLINK_EN (1 << 2)
	32
0a2f915b HZ	33	struct pm860x_led {
	34	struct led_classdev cdev;
	35	struct i2c_client *i2c;
	36	struct work_struct work;
	37	struct pm860x_chip *chip;
	38	struct mutex lock;
	39	char name[MFD_NAME_SIZE];
	40
	41	int port;
	42	int iset;
0a2f915b HZ	43	unsigned char brightness;
	44	unsigned char current_brightness;
	45
894fc8f2 HZ	46	int reg_control;
	47	int reg_blink;
	48	int blink_mask;
0a2f915b HZ	49	};
0a2f915b HZ	50
b3b97473 JZ	51	static int led_power_set(struct pm860x_chip *chip, int port, int on)
	52	{
	53	int ret = -EINVAL;
	54
	55	switch (port) {
894fc8f2 HZ	56	case 0:
	57	case 1:
	58	case 2:
b3b97473 JZ	59	ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
	60	pm8606_osc_disable(chip, RGB1_ENABLE);
	61	break;
894fc8f2 HZ	62	case 3:
	63	case 4:
	64	case 5:
b3b97473 JZ	65	ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
	66	pm8606_osc_disable(chip, RGB2_ENABLE);
	67	break;
	68	}
	69	return ret;
	70	}
	71
f5d59fc5	72	static void pm860x_led_work(struct work_struct *work)
0a2f915b	73	{
0a2f915b	74
f5d59fc5 HZ	75	struct pm860x_led *led;
f5d59fc5 HZ	76	struct pm860x_chip *chip;
3154c344	77	unsigned char buf[3];
894fc8f2	78	int ret;
f5d59fc5 HZ	79
	80	led = container_of(work, struct pm860x_led, work);
	81	chip = led->chip;
0a2f915b	82	mutex_lock(&led->lock);
f5d59fc5	83	if ((led->current_brightness == 0) && led->brightness) {
b3b97473	84	led_power_set(chip, led->port, 1);
f5d59fc5	85	if (led->iset) {
894fc8f2	86	pm860x_set_bits(led->i2c, led->reg_control,
f5d59fc5	87	LED_CURRENT_MASK, led->iset);
0a2f915b	88	}
894fc8f2	89	pm860x_set_bits(led->i2c, led->reg_blink,
3154c344	90	LED_BLINK_MASK, LED_ON_CONTINUOUS);
894fc8f2 HZ	91	pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
894fc8f2 HZ	92	led->blink_mask);
0a2f915b	93	}
894fc8f2	94	pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
f5d59fc5	95	led->brightness);
3154c344 HZ	96
3154c344 HZ	97	if (led->brightness == 0) {
894fc8f2	98	pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
3154c344 HZ	99	ret = buf[0] & LED_PWM_MASK;
	100	ret \|= buf[1] & LED_PWM_MASK;
	101	ret \|= buf[2] & LED_PWM_MASK;
	102	if (ret == 0) {
	103	/* unset current since no led is lighting */
894fc8f2	104	pm860x_set_bits(led->i2c, led->reg_control,
3154c344	105	LED_CURRENT_MASK, 0);
894fc8f2 HZ	106	pm860x_set_bits(led->i2c, PM8606_WLED3B,
894fc8f2 HZ	107	led->blink_mask, 0);
b3b97473	108	led_power_set(chip, led->port, 0);
3154c344 HZ	109	}
3154c344 HZ	110	}
f5d59fc5 HZ	111	led->current_brightness = led->brightness;
f5d59fc5 HZ	112	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
894fc8f2	113	led->reg_control, led->brightness);
0a2f915b	114	mutex_unlock(&led->lock);
0a2f915b HZ	115	}
	116
	117	static void pm860x_led_set(struct led_classdev *cdev,
	118	enum led_brightness value)
	119	{
	120	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
	121
0a2f915b	122	data->brightness = value >> 3;
0a2f915b	123	schedule_work(&data->work);
0a2f915b HZ	124	}
0a2f915b HZ	125
2e57d567 HZ	126	#ifdef CONFIG_OF
	127	static int pm860x_led_dt_init(struct platform_device *pdev,
	128	struct pm860x_led *data)
	129	{
61d4eb27	130	struct device_node nproot, np;
2e57d567	131	int iset = 0;
61d4eb27	132
1175d5bc	133	if (!pdev->dev.parent->of_node)
2e57d567	134	return -ENODEV;
1175d5bc	135	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
2e57d567 HZ	136	if (!nproot) {
	137	dev_err(&pdev->dev, "failed to find leds node\n");
	138	return -ENODEV;
	139	}
	140	for_each_child_of_node(nproot, np) {
	141	if (!of_node_cmp(np->name, data->name)) {
	142	of_property_read_u32(np, "marvell,88pm860x-iset",
	143	&iset);
	144	data->iset = PM8606_LED_CURRENT(iset);
ffdc307d	145	of_node_put(np);
2e57d567 HZ	146	break;
	147	}
	148	}
61d4eb27	149	of_node_put(nproot);
2e57d567 HZ	150	return 0;
	151	}
	152	#else
	153	#define pm860x_led_dt_init(x, y) (-1)
	154	#endif
	155
0a2f915b HZ	156	static int pm860x_led_probe(struct platform_device *pdev)
	157	{
	158	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
87aae1ea	159	struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
0a2f915b HZ	160	struct pm860x_led *data;
0a2f915b HZ	161	struct resource *res;
894fc8f2	162	int ret = 0;
0a2f915b	163
b523cfe6	164	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
0a2f915b HZ	165	if (data == NULL)
0a2f915b HZ	166	return -ENOMEM;
894fc8f2 HZ	167	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
	168	if (!res) {
	169	dev_err(&pdev->dev, "No REG resource for control\n");
3651c4b9	170	return -ENXIO;
894fc8f2 HZ	171	}
	172	data->reg_control = res->start;
	173	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
	174	if (!res) {
	175	dev_err(&pdev->dev, "No REG resource for blink\n");
3651c4b9	176	return -ENXIO;
894fc8f2 HZ	177	}
	178	data->reg_blink = res->start;
	179	memset(data->name, 0, MFD_NAME_SIZE);
	180	switch (pdev->id) {
	181	case 0:
	182	data->blink_mask = LED1_BLINK_EN;
	183	sprintf(data->name, "led0-red");
	184	break;
	185	case 1:
	186	data->blink_mask = LED1_BLINK_EN;
	187	sprintf(data->name, "led0-green");
	188	break;
	189	case 2:
	190	data->blink_mask = LED1_BLINK_EN;
	191	sprintf(data->name, "led0-blue");
	192	break;
	193	case 3:
	194	data->blink_mask = LED2_BLINK_EN;
	195	sprintf(data->name, "led1-red");
	196	break;
	197	case 4:
	198	data->blink_mask = LED2_BLINK_EN;
	199	sprintf(data->name, "led1-green");
	200	break;
	201	case 5:
	202	data->blink_mask = LED2_BLINK_EN;
	203	sprintf(data->name, "led1-blue");
	204	break;
	205	}
84196a2f	206	platform_set_drvdata(pdev, data);
0a2f915b HZ	207	data->chip = chip;
0a2f915b HZ	208	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
894fc8f2	209	data->port = pdev->id;
2e57d567 HZ	210	if (pm860x_led_dt_init(pdev, data))
	211	if (pdata)
	212	data->iset = pdata->iset;
0a2f915b HZ	213
	214	data->current_brightness = 0;
	215	data->cdev.name = data->name;
	216	data->cdev.brightness_set = pm860x_led_set;
0a2f915b HZ	217	mutex_init(&data->lock);
	218	INIT_WORK(&data->work, pm860x_led_work);
	219
	220	ret = led_classdev_register(chip->dev, &data->cdev);
	221	if (ret < 0) {
	222	dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
b523cfe6	223	return ret;
0a2f915b	224	}
3154c344	225	pm860x_led_set(&data->cdev, 0);
0a2f915b	226	return 0;
0a2f915b HZ	227	}
	228
	229	static int pm860x_led_remove(struct platform_device *pdev)
	230	{
	231	struct pm860x_led *data = platform_get_drvdata(pdev);
	232
	233	led_classdev_unregister(&data->cdev);
0a2f915b HZ	234
	235	return 0;
	236	}
	237
	238	static struct platform_driver pm860x_led_driver = {
	239	.driver = {
	240	.name = "88pm860x-led",
0a2f915b HZ	241	},
	242	.probe = pm860x_led_probe,
	243	.remove = pm860x_led_remove,
	244	};
	245
892a8843	246	module_platform_driver(pm860x_led_driver);
0a2f915b HZ	247
	248	MODULE_DESCRIPTION("LED driver for Marvell PM860x");
	249	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	250	MODULE_LICENSE("GPL");
	251	MODULE_ALIAS("platform:88pm860x-led");