[GitHub/mt8127/android_kernel_alcatel_ttab.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/fb.h>
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/mfd/88pm860x.h>
#include <linux/slab.h>

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

#define CURRENT_MASK		(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 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;

	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_MASK, 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;

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

static int __check_device(struct pm860x_backlight_pdata *pdata, char *name)
{
	struct pm860x_backlight_pdata *p = pdata;
	int ret = -EINVAL;

	while (p && p->id) {
		if ((p->id != PM8606_ID_BACKLIGHT) || (p->flags < 0))
			break;

		if (!strncmp(name, pm860x_backlight_name[p->flags],
			MFD_NAME_SIZE)) {
			ret = (int)p->flags;
			break;
		}
		p++;
	}
	return ret;
}

static int pm860x_backlight_probe(struct platform_device *pdev)
{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_platform_data *pm860x_pdata;
	struct pm860x_backlight_pdata *pdata = NULL;
	struct pm860x_backlight_data *data;
	struct backlight_device *bl;
	struct resource *res;
	struct backlight_properties props;
	unsigned char value;
	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;
	}

	if (pdev->dev.parent->platform_data) {
		pm860x_pdata = pdev->dev.parent->platform_data;
		pdata = pm860x_pdata->backlight;
	}
	if (pdata == NULL) {
		dev_err(&pdev->dev, "platform data isn't assigned to "
			"backlight\n");
		return -EINVAL;
	}

	data = kzalloc(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 = __check_device(pdata, name);
	if (data->port < 0) {
		dev_err(&pdev->dev, "wrong platform data is assigned");
		return -EINVAL;
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	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");
		kfree(data);
		return PTR_ERR(bl);
	}
	bl->props.brightness = MAX_BRIGHTNESS;

	platform_set_drvdata(pdev, bl);

	/* Enable reference VSYS */
	ret = pm860x_reg_read(data->i2c, PM8606_VSYS);
	if (ret < 0)
		goto out;
	if ((ret & PM8606_VSYS_EN) == 0) {
		value = ret | PM8606_VSYS_EN;
		ret = pm860x_reg_write(data->i2c, PM8606_VSYS, value);
		if (ret < 0)
			goto out;
	}
	/* Enable reference OSC */
	ret = pm860x_reg_read(data->i2c, PM8606_MISC);
	if (ret < 0)
		goto out;
	if ((ret & PM8606_MISC_OSC_EN) == 0) {
		value = ret | PM8606_MISC_OSC_EN;
		ret = pm860x_reg_write(data->i2c, PM8606_MISC, value);
		if (ret < 0)
			goto out;
	}
	/* read current backlight */
	ret = pm860x_backlight_get_brightness(bl);
	if (ret < 0)
		goto out;

	backlight_update_status(bl);
	return 0;
out:
	kfree(data);
	return ret;
}

static int pm860x_backlight_remove(struct platform_device *pdev)
{
	struct backlight_device *bl = platform_get_drvdata(pdev);
	struct pm860x_backlight_data *data = bl_get_data(bl);

	backlight_device_unregister(bl);
	kfree(data);
	return 0;
}

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

static int __init pm860x_backlight_init(void)
{
	return platform_driver_register(&pm860x_backlight_driver);
}
module_init(pm860x_backlight_init);

static void __exit pm860x_backlight_exit(void)
{
	platform_driver_unregister(&pm860x_backlight_driver);
}
module_exit(pm860x_backlight_exit);

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>
	15	#include <linux/fb.h>
	16	#include <linux/i2c.h>
	17	#include <linux/backlight.h>
	18	#include <linux/mfd/88pm860x.h>
5a0e3ad6	19	#include <linux/slab.h>
d07e8bf8 HZ	20
	21	#define MAX_BRIGHTNESS (0xFF)
	22	#define MIN_BRIGHTNESS (0)
	23
	24	#define CURRENT_MASK (0x1F << 1)
	25
	26	struct pm860x_backlight_data {
	27	struct pm860x_chip *chip;
	28	struct i2c_client *i2c;
	29	int current_brightness;
	30	int port;
	31	int pwm;
	32	int iset;
	33	};
	34
	35	static inline int wled_a(int port)
	36	{
	37	int ret;
	38
	39	ret = ((port - PM8606_BACKLIGHT1) << 1) + 2;
	40	return ret;
	41	}
	42
	43	static inline int wled_b(int port)
	44	{
	45	int ret;
	46
	47	ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
	48	return ret;
	49	}
	50
	51	/* WLED2 & WLED3 share the same IDC */
	52	static inline int wled_idc(int port)
	53	{
	54	int ret;
	55
	56	switch (port) {
	57	case PM8606_BACKLIGHT1:
	58	case PM8606_BACKLIGHT2:
	59	ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
	60	break;
	61	case PM8606_BACKLIGHT3:
	62	default:
	63	ret = ((port - PM8606_BACKLIGHT2) << 1) + 3;
	64	break;
	65	}
	66	return ret;
	67	}
	68
	69	static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
	70	{
	71	struct pm860x_backlight_data *data = bl_get_data(bl);
	72	struct pm860x_chip *chip = data->chip;
	73	unsigned char value;
	74	int ret;
	75
	76	if (brightness > MAX_BRIGHTNESS)
	77	value = MAX_BRIGHTNESS;
	78	else
	79	value = brightness;
	80
	81	ret = pm860x_reg_write(data->i2c, wled_a(data->port), value);
	82	if (ret < 0)
	83	goto out;
84
85	if ((data->current_brightness == 0) && brightness) {
86	if (data->iset) {
87	ret = pm860x_set_bits(data->i2c, wled_idc(data->port),
88	CURRENT_MASK, data->iset);
89	if (ret < 0)
90	goto out;
91	}
92	if (data->pwm) {
93	ret = pm860x_set_bits(data->i2c, PM8606_PWM,
94	PM8606_PWM_FREQ_MASK, data->pwm);
95	if (ret < 0)
96	goto out;
97	}
98	if (brightness == MAX_BRIGHTNESS) {
99	/* set WLED_ON bit as 100% */
100	ret = pm860x_set_bits(data->i2c, wled_b(data->port),
101	PM8606_WLED_ON, PM8606_WLED_ON);
102	}
103	} else {
104	if (brightness == MAX_BRIGHTNESS) {
105	/* set WLED_ON bit as 100% */
106	ret = pm860x_set_bits(data->i2c, wled_b(data->port),
107	PM8606_WLED_ON, PM8606_WLED_ON);
108	} else {
109	/* clear WLED_ON bit since it's not 100% */
110	ret = pm860x_set_bits(data->i2c, wled_b(data->port),
111	PM8606_WLED_ON, 0);
112	}
113	}
114	if (ret < 0)
115	goto out;
116
117	dev_dbg(chip->dev, "set brightness %d\n", value);
118	data->current_brightness = value;
119	return 0;
120	out:
121	dev_dbg(chip->dev, "set brightness %d failure with return "
122	"value:%d\n", value, ret);
123	return ret;
124	}
125
126	static int pm860x_backlight_update_status(struct backlight_device *bl)
127	{
128	int brightness = bl->props.brightness;
129
130	if (bl->props.power != FB_BLANK_UNBLANK)
131	brightness = 0;
132
133	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
134	brightness = 0;
135
136	if (bl->props.state & BL_CORE_SUSPENDED)
137	brightness = 0;
138
139	return pm860x_backlight_set(bl, brightness);
140	}
141
142	static int pm860x_backlight_get_brightness(struct backlight_device *bl)
143	{
144	struct pm860x_backlight_data *data = bl_get_data(bl);
145	struct pm860x_chip *chip = data->chip;
146	int ret;
147
148	ret = pm860x_reg_read(data->i2c, wled_a(data->port));
149	if (ret < 0)
150	goto out;
151	data->current_brightness = ret;
152	dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
153	return data->current_brightness;
154	out:
155	return -EINVAL;
156	}
157
158	static struct backlight_ops pm860x_backlight_ops = {
159	.options = BL_CORE_SUSPENDRESUME,
160	.update_status = pm860x_backlight_update_status,
161	.get_brightness = pm860x_backlight_get_brightness,
162	};
163
164	static int __check_device(struct pm860x_backlight_pdata pdata, char name)
165	{
166	struct pm860x_backlight_pdata *p = pdata;
167	int ret = -EINVAL;
168
169	while (p && p->id) {
170	if ((p->id != PM8606_ID_BACKLIGHT) \|\| (p->flags < 0))
171	break;
172
173	if (!strncmp(name, pm860x_backlight_name[p->flags],
174	MFD_NAME_SIZE)) {
175	ret = (int)p->flags;
176	break;
177	}
178	p++;
179	}
180	return ret;
181	}
182
183	static int pm860x_backlight_probe(struct platform_device *pdev)
184	{
185	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
186	struct pm860x_platform_data *pm860x_pdata;
187	struct pm860x_backlight_pdata *pdata = NULL;
188	struct pm860x_backlight_data *data;
189	struct backlight_device *bl;
190	struct resource *res;
a19a6ee6	191	struct backlight_properties props;
d07e8bf8 HZ	192	unsigned char value;
	193	char name[MFD_NAME_SIZE];
	194	int ret;
	195
	196	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	197	if (res == NULL) {
	198	dev_err(&pdev->dev, "No I/O resource!\n");
	199	return -EINVAL;
	200	}
	201
	202	if (pdev->dev.parent->platform_data) {
	203	pm860x_pdata = pdev->dev.parent->platform_data;
	204	pdata = pm860x_pdata->backlight;
	205	}
	206	if (pdata == NULL) {
	207	dev_err(&pdev->dev, "platform data isn't assigned to "
	208	"backlight\n");
	209	return -EINVAL;
	210	}
	211
	212	data = kzalloc(sizeof(struct pm860x_backlight_data), GFP_KERNEL);
	213	if (data == NULL)
	214	return -ENOMEM;
	215	strncpy(name, res->name, MFD_NAME_SIZE);
	216	data->chip = chip;
	217	data->i2c = (chip->id == CHIP_PM8606) ? chip->client \
	218	: chip->companion;
	219	data->current_brightness = MAX_BRIGHTNESS;
	220	data->pwm = pdata->pwm;
	221	data->iset = pdata->iset;
	222	data->port = __check_device(pdata, name);
	223	if (data->port < 0) {
	224	dev_err(&pdev->dev, "wrong platform data is assigned");
	225	return -EINVAL;
	226	}
	227
a19a6ee6 MG	228	memset(&props, 0, sizeof(struct backlight_properties));
a19a6ee6 MG	229	props.max_brightness = MAX_BRIGHTNESS;
d07e8bf8	230	bl = backlight_device_register(name, &pdev->dev, data,
a19a6ee6	231	&pm860x_backlight_ops, &props);
d07e8bf8 HZ	232	if (IS_ERR(bl)) {
	233	dev_err(&pdev->dev, "failed to register backlight\n");
	234	kfree(data);
	235	return PTR_ERR(bl);
	236	}
d07e8bf8 HZ	237	bl->props.brightness = MAX_BRIGHTNESS;
	238
	239	platform_set_drvdata(pdev, bl);
	240
	241	/* Enable reference VSYS */
	242	ret = pm860x_reg_read(data->i2c, PM8606_VSYS);
	243	if (ret < 0)
	244	goto out;
	245	if ((ret & PM8606_VSYS_EN) == 0) {
	246	value = ret \| PM8606_VSYS_EN;
	247	ret = pm860x_reg_write(data->i2c, PM8606_VSYS, value);
	248	if (ret < 0)
	249	goto out;
	250	}
	251	/* Enable reference OSC */
	252	ret = pm860x_reg_read(data->i2c, PM8606_MISC);
	253	if (ret < 0)
	254	goto out;
	255	if ((ret & PM8606_MISC_OSC_EN) == 0) {
	256	value = ret \| PM8606_MISC_OSC_EN;
	257	ret = pm860x_reg_write(data->i2c, PM8606_MISC, value);
	258	if (ret < 0)
	259	goto out;
	260	}
	261	/* read current backlight */
	262	ret = pm860x_backlight_get_brightness(bl);
	263	if (ret < 0)
	264	goto out;
	265
	266	backlight_update_status(bl);
	267	return 0;
	268	out:
	269	kfree(data);
	270	return ret;
	271	}
	272
	273	static int pm860x_backlight_remove(struct platform_device *pdev)
	274	{
	275	struct backlight_device *bl = platform_get_drvdata(pdev);
	276	struct pm860x_backlight_data *data = bl_get_data(bl);
	277
	278	backlight_device_unregister(bl);
	279	kfree(data);
	280	return 0;
	281	}
	282
	283	static struct platform_driver pm860x_backlight_driver = {
	284	.driver = {
	285	.name = "88pm860x-backlight",
	286	.owner = THIS_MODULE,
	287	},
	288	.probe = pm860x_backlight_probe,
	289	.remove = pm860x_backlight_remove,
	290	};
	291
	292	static int __init pm860x_backlight_init(void)
	293	{
	294	return platform_driver_register(&pm860x_backlight_driver);
	295	}
	296	module_init(pm860x_backlight_init);
	297
	298	static void __exit pm860x_backlight_exit(void)
	299	{
	300	platform_driver_unregister(&pm860x_backlight_driver);
301	}
302	module_exit(pm860x_backlight_exit);
303
304	MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
305	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
306	MODULE_LICENSE("GPL");
307	MODULE_ALIAS("platform:88pm860x-backlight");