[deliverable/linux.git] / drivers / video / backlight / 88pm860x_bl.c

/*
 * Backlight driver for Marvell Semiconductor 88PM8606
 *
 * 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/init.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>

#define MAX_BRIGHTNESS		(0xFF)
#define MIN_BRIGHTNESS		(0)

#define CURRENT_BITMASK		(0x1F << 1)

struct pm860x_backlight_data {
	struct pm860x_chip *chip;
	struct i2c_client *i2c;
	int	current_brightness;
	int	port;
	int	pwm;
	int	iset;
};

static inline int wled_a(int port)
{
	int ret;

	ret = ((port - PM8606_BACKLIGHT1) << 1) + 2;
	return ret;
}

static inline int wled_b(int port)
{
	int ret;

	ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
	return ret;
}

/* WLED2 & WLED3 share the same IDC */
static inline int wled_idc(int port)
{
	int ret;

	switch (port) {
	case PM8606_BACKLIGHT1:
	case PM8606_BACKLIGHT2:
		ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
		break;
	case PM8606_BACKLIGHT3:
	default:
		ret = ((port - PM8606_BACKLIGHT2) << 1) + 3;
		break;
	}
	return ret;
}

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

	switch (port) {
	case PM8606_BACKLIGHT1:
		ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) :
			pm8606_osc_disable(chip, WLED1_DUTY);
		break;
	case PM8606_BACKLIGHT2:
		ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) :
			pm8606_osc_disable(chip, WLED2_DUTY);
		break;
	case PM8606_BACKLIGHT3:
		ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) :
			pm8606_osc_disable(chip, WLED3_DUTY);
		break;
	}
	return ret;
}

static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
{
	struct pm860x_backlight_data *data = bl_get_data(bl);
	struct pm860x_chip *chip = data->chip;
	unsigned char value;
	int ret;

	if (brightness > MAX_BRIGHTNESS)
		value = MAX_BRIGHTNESS;
	else
		value = brightness;

	if (brightness)
		backlight_power_set(chip, data->port, 1);

	ret = pm860x_reg_write(data->i2c, wled_a(data->port), value);
	if (ret < 0)
		goto out;

	if ((data->current_brightness == 0) && brightness) {
		if (data->iset) {
			ret = pm860x_set_bits(data->i2c, wled_idc(data->port),
					      CURRENT_BITMASK, data->iset);
			if (ret < 0)
				goto out;
		}
		if (data->pwm) {
			ret = pm860x_set_bits(data->i2c, PM8606_PWM,
					      PM8606_PWM_FREQ_MASK, data->pwm);
			if (ret < 0)
				goto out;
		}
		if (brightness == MAX_BRIGHTNESS) {
			/* set WLED_ON bit as 100% */
			ret = pm860x_set_bits(data->i2c, wled_b(data->port),
					      PM8606_WLED_ON, PM8606_WLED_ON);
		}
	} else {
		if (brightness == MAX_BRIGHTNESS) {
			/* set WLED_ON bit as 100% */
			ret = pm860x_set_bits(data->i2c, wled_b(data->port),
					      PM8606_WLED_ON, PM8606_WLED_ON);
		} else {
			/* clear WLED_ON bit since it's not 100% */
			ret = pm860x_set_bits(data->i2c, wled_b(data->port),
					      PM8606_WLED_ON, 0);
		}
	}
	if (ret < 0)
		goto out;

	if (brightness == 0)
		backlight_power_set(chip, data->port, 0);

	dev_dbg(chip->dev, "set brightness %d\n", value);
	data->current_brightness = value;
	return 0;
out:
	dev_dbg(chip->dev, "set brightness %d failure with return "
		"value:%d\n", value, ret);
	return ret;
}

static int pm860x_backlight_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.state & BL_CORE_SUSPENDED)
		brightness = 0;

	return pm860x_backlight_set(bl, brightness);
}

static int pm860x_backlight_get_brightness(struct backlight_device *bl)
{
	struct pm860x_backlight_data *data = bl_get_data(bl);
	struct pm860x_chip *chip = data->chip;
	int ret;

	ret = pm860x_reg_read(data->i2c, wled_a(data->port));
	if (ret < 0)
		goto out;
	data->current_brightness = ret;
	dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
	return data->current_brightness;
out:
	return -EINVAL;
}

static const struct backlight_ops pm860x_backlight_ops = {
	.options	= BL_CORE_SUSPENDRESUME,
	.update_status	= pm860x_backlight_update_status,
	.get_brightness	= pm860x_backlight_get_brightness,
};

static int pm860x_backlight_probe(struct platform_device *pdev)
{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_backlight_pdata *pdata = NULL;
	struct pm860x_backlight_data *data;
	struct backlight_device *bl;
	struct resource *res;
	struct backlight_properties props;
	char name[MFD_NAME_SIZE];
	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, "platform data isn't assigned to "
			"backlight\n");
		return -EINVAL;
	}

	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),
			    GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;
	strncpy(name, res->name, MFD_NAME_SIZE);
	data->chip = chip;
	data->i2c = (chip->id == CHIP_PM8606) ? chip->client	\
			: chip->companion;
	data->current_brightness = MAX_BRIGHTNESS;
	data->pwm = pdata->pwm;
	data->iset = pdata->iset;
	data->port = pdata->flags;
	if (data->port < 0) {
		dev_err(&pdev->dev, "wrong platform data is assigned");
		return -EINVAL;
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = MAX_BRIGHTNESS;
	bl = backlight_device_register(name, &pdev->dev, data,
					&pm860x_backlight_ops, &props);
	if (IS_ERR(bl)) {
		dev_err(&pdev->dev, "failed to register backlight\n");
		return PTR_ERR(bl);
	}
	bl->props.brightness = MAX_BRIGHTNESS;

	platform_set_drvdata(pdev, bl);

	/* read current backlight */
	ret = pm860x_backlight_get_brightness(bl);
	if (ret < 0)
		goto out;

	backlight_update_status(bl);
	return 0;
out:
	backlight_device_unregister(bl);
	return ret;
}

static int pm860x_backlight_remove(struct platform_device *pdev)
{
	struct backlight_device *bl = platform_get_drvdata(pdev);

	backlight_device_unregister(bl);
	return 0;
}

static struct platform_driver pm860x_backlight_driver = {
	.driver		= {
		.name	= "88pm860x-backlight",
		.owner	= THIS_MODULE,
	},
	.probe		= pm860x_backlight_probe,
	.remove		= pm860x_backlight_remove,
};

module_platform_driver(pm860x_backlight_driver);

MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-backlight");
Commit	Line	Data
d07e8bf8 HZ	1	/*
	2	* Backlight driver for Marvell Semiconductor 88PM8606
	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	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/platform_device.h>
adb70483	15	#include <linux/slab.h>
d07e8bf8 HZ	16	#include <linux/fb.h>
	17	#include <linux/i2c.h>
	18	#include <linux/backlight.h>
	19	#include <linux/mfd/88pm860x.h>
355b200b	20	#include <linux/module.h>
d07e8bf8 HZ	21
	22	#define MAX_BRIGHTNESS (0xFF)
	23	#define MIN_BRIGHTNESS (0)
	24
2550326a	25	#define CURRENT_BITMASK (0x1F << 1)
d07e8bf8 HZ	26
	27	struct pm860x_backlight_data {
	28	struct pm860x_chip *chip;
	29	struct i2c_client *i2c;
	30	int current_brightness;
	31	int port;
	32	int pwm;
	33	int iset;
	34	};
	35
	36	static inline int wled_a(int port)
	37	{
	38	int ret;
	39
	40	ret = ((port - PM8606_BACKLIGHT1) << 1) + 2;
	41	return ret;
	42	}
	43
	44	static inline int wled_b(int port)
	45	{
	46	int ret;
	47
	48	ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
	49	return ret;
	50	}
	51
	52	/* WLED2 & WLED3 share the same IDC */
	53	static inline int wled_idc(int port)
	54	{
	55	int ret;
	56
	57	switch (port) {
	58	case PM8606_BACKLIGHT1:
	59	case PM8606_BACKLIGHT2:
	60	ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
	61	break;
	62	case PM8606_BACKLIGHT3:
	63	default:
	64	ret = ((port - PM8606_BACKLIGHT2) << 1) + 3;
	65	break;
	66	}
	67	return ret;
	68	}
	69
1efc1581 JZ	70	static int backlight_power_set(struct pm860x_chip *chip, int port,
	71	int on)
	72	{
	73	int ret = -EINVAL;
	74
	75	switch (port) {
	76	case PM8606_BACKLIGHT1:
	77	ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) :
	78	pm8606_osc_disable(chip, WLED1_DUTY);
	79	break;
	80	case PM8606_BACKLIGHT2:
	81	ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) :
	82	pm8606_osc_disable(chip, WLED2_DUTY);
	83	break;
	84	case PM8606_BACKLIGHT3:
	85	ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) :
	86	pm8606_osc_disable(chip, WLED3_DUTY);
	87	break;
	88	}
	89	return ret;
	90	}
	91
d07e8bf8 HZ	92	static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
	93	{
	94	struct pm860x_backlight_data *data = bl_get_data(bl);
	95	struct pm860x_chip *chip = data->chip;
	96	unsigned char value;
	97	int ret;
	98
	99	if (brightness > MAX_BRIGHTNESS)
	100	value = MAX_BRIGHTNESS;
	101	else
	102	value = brightness;
	103
1efc1581 JZ	104	if (brightness)
	105	backlight_power_set(chip, data->port, 1);
	106
d07e8bf8 HZ	107	ret = pm860x_reg_write(data->i2c, wled_a(data->port), value);
	108	if (ret < 0)
	109	goto out;
	110
	111	if ((data->current_brightness == 0) && brightness) {
	112	if (data->iset) {
	113	ret = pm860x_set_bits(data->i2c, wled_idc(data->port),
2550326a	114	CURRENT_BITMASK, data->iset);
d07e8bf8 HZ	115	if (ret < 0)
	116	goto out;
	117	}
	118	if (data->pwm) {
	119	ret = pm860x_set_bits(data->i2c, PM8606_PWM,
	120	PM8606_PWM_FREQ_MASK, data->pwm);
	121	if (ret < 0)
	122	goto out;
	123	}
	124	if (brightness == MAX_BRIGHTNESS) {
	125	/* set WLED_ON bit as 100% */
	126	ret = pm860x_set_bits(data->i2c, wled_b(data->port),
	127	PM8606_WLED_ON, PM8606_WLED_ON);
	128	}
	129	} else {
	130	if (brightness == MAX_BRIGHTNESS) {
	131	/* set WLED_ON bit as 100% */
	132	ret = pm860x_set_bits(data->i2c, wled_b(data->port),
	133	PM8606_WLED_ON, PM8606_WLED_ON);
	134	} else {
	135	/* clear WLED_ON bit since it's not 100% */
	136	ret = pm860x_set_bits(data->i2c, wled_b(data->port),
	137	PM8606_WLED_ON, 0);
	138	}
	139	}
	140	if (ret < 0)
	141	goto out;
	142
1efc1581 JZ	143	if (brightness == 0)
	144	backlight_power_set(chip, data->port, 0);
	145
d07e8bf8 HZ	146	dev_dbg(chip->dev, "set brightness %d\n", value);
	147	data->current_brightness = value;
	148	return 0;
	149	out:
	150	dev_dbg(chip->dev, "set brightness %d failure with return "
	151	"value:%d\n", value, ret);
	152	return ret;
	153	}
	154
	155	static int pm860x_backlight_update_status(struct backlight_device *bl)
	156	{
	157	int brightness = bl->props.brightness;
	158
	159	if (bl->props.power != FB_BLANK_UNBLANK)
	160	brightness = 0;
	161
	162	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
	163	brightness = 0;
	164
	165	if (bl->props.state & BL_CORE_SUSPENDED)
	166	brightness = 0;
	167
	168	return pm860x_backlight_set(bl, brightness);
	169	}
	170
	171	static int pm860x_backlight_get_brightness(struct backlight_device *bl)
	172	{
	173	struct pm860x_backlight_data *data = bl_get_data(bl);
	174	struct pm860x_chip *chip = data->chip;
	175	int ret;
	176
	177	ret = pm860x_reg_read(data->i2c, wled_a(data->port));
	178	if (ret < 0)
	179	goto out;
	180	data->current_brightness = ret;
	181	dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
	182	return data->current_brightness;
	183	out:
	184	return -EINVAL;
	185	}
	186
acc2472e	187	static const struct backlight_ops pm860x_backlight_ops = {
d07e8bf8 HZ	188	.options = BL_CORE_SUSPENDRESUME,
	189	.update_status = pm860x_backlight_update_status,
	190	.get_brightness = pm860x_backlight_get_brightness,
	191	};
	192
d07e8bf8 HZ	193	static int pm860x_backlight_probe(struct platform_device *pdev)
	194	{
	195	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
d07e8bf8 HZ	196	struct pm860x_backlight_pdata *pdata = NULL;
	197	struct pm860x_backlight_data *data;
	198	struct backlight_device *bl;
	199	struct resource *res;
a19a6ee6	200	struct backlight_properties props;
d07e8bf8 HZ	201	char name[MFD_NAME_SIZE];
	202	int ret;
	203
	204	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	205	if (res == NULL) {
	206	dev_err(&pdev->dev, "No I/O resource!\n");
	207	return -EINVAL;
	208	}
	209
07259a70	210	pdata = pdev->dev.platform_data;
d07e8bf8 HZ	211	if (pdata == NULL) {
	212	dev_err(&pdev->dev, "platform data isn't assigned to "
	213	"backlight\n");
	214	return -EINVAL;
	215	}
	216
ce969228 JL	217	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),
ce969228 JL	218	GFP_KERNEL);
d07e8bf8 HZ	219	if (data == NULL)
	220	return -ENOMEM;
	221	strncpy(name, res->name, MFD_NAME_SIZE);
	222	data->chip = chip;
	223	data->i2c = (chip->id == CHIP_PM8606) ? chip->client \
	224	: chip->companion;
	225	data->current_brightness = MAX_BRIGHTNESS;
	226	data->pwm = pdata->pwm;
	227	data->iset = pdata->iset;
adb70483	228	data->port = pdata->flags;
d07e8bf8 HZ	229	if (data->port < 0) {
	230	dev_err(&pdev->dev, "wrong platform data is assigned");
	231	return -EINVAL;
	232	}
	233
a19a6ee6	234	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	235	props.type = BACKLIGHT_RAW;
a19a6ee6	236	props.max_brightness = MAX_BRIGHTNESS;
d07e8bf8	237	bl = backlight_device_register(name, &pdev->dev, data,
a19a6ee6	238	&pm860x_backlight_ops, &props);
d07e8bf8 HZ	239	if (IS_ERR(bl)) {
d07e8bf8 HZ	240	dev_err(&pdev->dev, "failed to register backlight\n");
d07e8bf8 HZ	241	return PTR_ERR(bl);
d07e8bf8 HZ	242	}
d07e8bf8 HZ	243	bl->props.brightness = MAX_BRIGHTNESS;
	244
	245	platform_set_drvdata(pdev, bl);
	246
d07e8bf8 HZ	247	/* read current backlight */
	248	ret = pm860x_backlight_get_brightness(bl);
	249	if (ret < 0)
	250	goto out;
	251
	252	backlight_update_status(bl);
	253	return 0;
	254	out:
1f976996	255	backlight_device_unregister(bl);
d07e8bf8 HZ	256	return ret;
	257	}
	258
	259	static int pm860x_backlight_remove(struct platform_device *pdev)
	260	{
	261	struct backlight_device *bl = platform_get_drvdata(pdev);
d07e8bf8 HZ	262
d07e8bf8 HZ	263	backlight_device_unregister(bl);
d07e8bf8 HZ	264	return 0;
	265	}
	266
	267	static struct platform_driver pm860x_backlight_driver = {
	268	.driver = {
	269	.name = "88pm860x-backlight",
	270	.owner = THIS_MODULE,
	271	},
	272	.probe = pm860x_backlight_probe,
	273	.remove = pm860x_backlight_remove,
	274	};
	275
81178e02	276	module_platform_driver(pm860x_backlight_driver);
d07e8bf8 HZ	277
	278	MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
	279	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	280	MODULE_LICENSE("GPL");
	281	MODULE_ALIAS("platform:88pm860x-backlight");