[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / max8649.c

/*
 * Regulators driver for Maxim max8649
 *
 * Copyright (C) 2009-2010 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/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max8649.h>
#include <linux/regmap.h>

#define MAX8649_DCDC_VMIN	750000		/* uV */
#define MAX8649_DCDC_VMAX	1380000		/* uV */
#define MAX8649_DCDC_STEP	10000		/* uV */
#define MAX8649_VOL_MASK	0x3f

/* Registers */
#define MAX8649_MODE0		0x00
#define MAX8649_MODE1		0x01
#define MAX8649_MODE2		0x02
#define MAX8649_MODE3		0x03
#define MAX8649_CONTROL		0x04
#define MAX8649_SYNC		0x05
#define MAX8649_RAMP		0x06
#define MAX8649_CHIP_ID1	0x08
#define MAX8649_CHIP_ID2	0x09

/* Bits */
#define MAX8649_EN_PD		(1 << 7)
#define MAX8649_VID0_PD		(1 << 6)
#define MAX8649_VID1_PD		(1 << 5)
#define MAX8649_VID_MASK	(3 << 5)

#define MAX8649_FORCE_PWM	(1 << 7)
#define MAX8649_SYNC_EXTCLK	(1 << 6)

#define MAX8649_EXT_MASK	(3 << 6)

#define MAX8649_RAMP_MASK	(7 << 5)
#define MAX8649_RAMP_DOWN	(1 << 1)

struct max8649_regulator_info {
	struct regulator_dev	*regulator;
	struct device		*dev;
	struct regmap		*regmap;

	unsigned	mode:2;	/* bit[1:0] = VID1, VID0 */
	unsigned	extclk_freq:2;
	unsigned	extclk:1;
	unsigned	ramp_timing:3;
	unsigned	ramp_down:1;
};

static int max8649_enable_time(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	int voltage, rate, ret;
	unsigned int val;

	/* get voltage */
	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;
	val &= MAX8649_VOL_MASK;
	voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);

	/* get rate */
	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
	if (ret != 0)
		return ret;
	ret = (val & MAX8649_RAMP_MASK) >> 5;
	rate = (32 * 1000) >> ret;	/* uV/uS */

	return DIV_ROUND_UP(voltage, rate);
}

static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
				   MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
				   MAX8649_FORCE_PWM, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int max8649_get_mode(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;
	if (val & MAX8649_FORCE_PWM)
		return REGULATOR_MODE_FAST;
	return REGULATOR_MODE_NORMAL;
}

static struct regulator_ops max8649_dcdc_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage	= regulator_list_voltage_linear,
	.map_voltage	= regulator_map_voltage_linear,
	.enable		= regulator_enable_regmap,
	.disable	= regulator_disable_regmap,
	.is_enabled	= regulator_is_enabled_regmap,
	.enable_time	= max8649_enable_time,
	.set_mode	= max8649_set_mode,
	.get_mode	= max8649_get_mode,

};

static struct regulator_desc dcdc_desc = {
	.name		= "max8649",
	.ops		= &max8649_dcdc_ops,
	.type		= REGULATOR_VOLTAGE,
	.n_voltages	= 1 << 6,
	.owner		= THIS_MODULE,
	.vsel_mask	= MAX8649_VOL_MASK,
	.min_uV		= MAX8649_DCDC_VMIN,
	.uV_step	= MAX8649_DCDC_STEP,
	.enable_reg	= MAX8649_CONTROL,
	.enable_mask	= MAX8649_EN_PD,
	.enable_is_inverted = true,
};

static struct regmap_config max8649_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int max8649_regulator_probe(struct i2c_client *client,
					     const struct i2c_device_id *id)
{
	struct max8649_platform_data *pdata = client->dev.platform_data;
	struct max8649_regulator_info *info = NULL;
	struct regulator_config config = { };
	unsigned int val;
	unsigned char data;
	int ret;

	info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
			    GFP_KERNEL);
	if (!info) {
		dev_err(&client->dev, "No enough memory\n");
		return -ENOMEM;
	}

	info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
	if (IS_ERR(info->regmap)) {
		ret = PTR_ERR(info->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
		return ret;
	}

	info->dev = &client->dev;
	i2c_set_clientdata(client, info);

	info->mode = pdata->mode;
	switch (info->mode) {
	case 0:
		dcdc_desc.vsel_reg = MAX8649_MODE0;
		break;
	case 1:
		dcdc_desc.vsel_reg = MAX8649_MODE1;
		break;
	case 2:
		dcdc_desc.vsel_reg = MAX8649_MODE2;
		break;
	case 3:
		dcdc_desc.vsel_reg = MAX8649_MODE3;
		break;
	default:
		break;
	}

	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
	if (ret != 0) {
		dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
			ret);
		return ret;
	}
	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);

	/* enable VID0 & VID1 */
	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);

	/* enable/disable external clock synchronization */
	info->extclk = pdata->extclk;
	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
	regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
			   MAX8649_SYNC_EXTCLK, data);
	if (info->extclk) {
		/* set external clock frequency */
		info->extclk_freq = pdata->extclk_freq;
		regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
				   info->extclk_freq << 6);
	}

	if (pdata->ramp_timing) {
		info->ramp_timing = pdata->ramp_timing;
		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
				   info->ramp_timing << 5);
	}

	info->ramp_down = pdata->ramp_down;
	if (info->ramp_down) {
		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
				   MAX8649_RAMP_DOWN);
	}

	config.dev = &client->dev;
	config.init_data = pdata->regulator;
	config.driver_data = info;
	config.regmap = info->regmap;

	info->regulator = regulator_register(&dcdc_desc, &config);
	if (IS_ERR(info->regulator)) {
		dev_err(info->dev, "failed to register regulator %s\n",
			dcdc_desc.name);
		return PTR_ERR(info->regulator);
	}

	return 0;
}

static int max8649_regulator_remove(struct i2c_client *client)
{
	struct max8649_regulator_info *info = i2c_get_clientdata(client);

	if (info)
		regulator_unregister(info->regulator);

	return 0;
}

static const struct i2c_device_id max8649_id[] = {
	{ "max8649", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max8649_id);

static struct i2c_driver max8649_driver = {
	.probe		= max8649_regulator_probe,
	.remove		= max8649_regulator_remove,
	.driver		= {
		.name	= "max8649",
	},
	.id_table	= max8649_id,
};

static int __init max8649_init(void)
{
	return i2c_add_driver(&max8649_driver);
}
subsys_initcall(max8649_init);

static void __exit max8649_exit(void)
{
	i2c_del_driver(&max8649_driver);
}
module_exit(max8649_exit);

/* Module information */
MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
a71b797f HZ	1	/*
	2	* Regulators driver for Maxim max8649
	3	*
	4	* Copyright (C) 2009-2010 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	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/err.h>
	14	#include <linux/i2c.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regulator/driver.h>
5a0e3ad6	17	#include <linux/slab.h>
a71b797f	18	#include <linux/regulator/max8649.h>
c5b68d47	19	#include <linux/regmap.h>
a71b797f HZ	20
	21	#define MAX8649_DCDC_VMIN 750000 /* uV */
	22	#define MAX8649_DCDC_VMAX 1380000 /* uV */
	23	#define MAX8649_DCDC_STEP 10000 /* uV */
	24	#define MAX8649_VOL_MASK 0x3f
	25
	26	/* Registers */
	27	#define MAX8649_MODE0 0x00
	28	#define MAX8649_MODE1 0x01
	29	#define MAX8649_MODE2 0x02
	30	#define MAX8649_MODE3 0x03
	31	#define MAX8649_CONTROL 0x04
	32	#define MAX8649_SYNC 0x05
	33	#define MAX8649_RAMP 0x06
	34	#define MAX8649_CHIP_ID1 0x08
	35	#define MAX8649_CHIP_ID2 0x09
	36
	37	/* Bits */
	38	#define MAX8649_EN_PD (1 << 7)
	39	#define MAX8649_VID0_PD (1 << 6)
	40	#define MAX8649_VID1_PD (1 << 5)
	41	#define MAX8649_VID_MASK (3 << 5)
	42
	43	#define MAX8649_FORCE_PWM (1 << 7)
	44	#define MAX8649_SYNC_EXTCLK (1 << 6)
	45
	46	#define MAX8649_EXT_MASK (3 << 6)
	47
	48	#define MAX8649_RAMP_MASK (7 << 5)
	49	#define MAX8649_RAMP_DOWN (1 << 1)
	50
	51	struct max8649_regulator_info {
	52	struct regulator_dev *regulator;
a71b797f	53	struct device *dev;
c5b68d47	54	struct regmap *regmap;
a71b797f	55
a71b797f HZ	56	unsigned mode:2; /* bit[1:0] = VID1, VID0 */
	57	unsigned extclk_freq:2;
	58	unsigned extclk:1;
	59	unsigned ramp_timing:3;
	60	unsigned ramp_down:1;
	61	};
	62
a71b797f HZ	63	static int max8649_enable_time(struct regulator_dev *rdev)
	64	{
	65	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	66	int voltage, rate, ret;
c5b68d47	67	unsigned int val;
a71b797f HZ	68
a71b797f HZ	69	/* get voltage */
817d8c2d	70	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
c5b68d47	71	if (ret != 0)
a71b797f	72	return ret;
c5b68d47	73	val &= MAX8649_VOL_MASK;
0fb737b5	74	voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
a71b797f HZ	75
a71b797f HZ	76	/* get rate */
c5b68d47 JC	77	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
c5b68d47 JC	78	if (ret != 0)
a71b797f	79	return ret;
c5b68d47	80	ret = (val & MAX8649_RAMP_MASK) >> 5;
a71b797f HZ	81	rate = (32 * 1000) >> ret; /* uV/uS */
a71b797f HZ	82
e69c4997	83	return DIV_ROUND_UP(voltage, rate);
a71b797f HZ	84	}
	85
	86	static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
	87	{
	88	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	89
	90	switch (mode) {
	91	case REGULATOR_MODE_FAST:
817d8c2d AL	92	regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
817d8c2d AL	93	MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
a71b797f HZ	94	break;
a71b797f HZ	95	case REGULATOR_MODE_NORMAL:
817d8c2d	96	regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
c5b68d47	97	MAX8649_FORCE_PWM, 0);
a71b797f HZ	98	break;
	99	default:
	100	return -EINVAL;
	101	}
	102	return 0;
	103	}
	104
	105	static unsigned int max8649_get_mode(struct regulator_dev *rdev)
	106	{
	107	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	108	unsigned int val;
a71b797f HZ	109	int ret;
a71b797f HZ	110
817d8c2d	111	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
c5b68d47 JC	112	if (ret != 0)
	113	return ret;
	114	if (val & MAX8649_FORCE_PWM)
a71b797f HZ	115	return REGULATOR_MODE_FAST;
	116	return REGULATOR_MODE_NORMAL;
	117	}
	118
	119	static struct regulator_ops max8649_dcdc_ops = {
40baecee	120	.set_voltage_sel = regulator_set_voltage_sel_regmap,
817d8c2d	121	.get_voltage_sel = regulator_get_voltage_sel_regmap,
0fb737b5	122	.list_voltage = regulator_list_voltage_linear,
40baecee	123	.map_voltage = regulator_map_voltage_linear,
ea88b132 AL	124	.enable = regulator_enable_regmap,
	125	.disable = regulator_disable_regmap,
	126	.is_enabled = regulator_is_enabled_regmap,
a71b797f HZ	127	.enable_time = max8649_enable_time,
	128	.set_mode = max8649_set_mode,
	129	.get_mode = max8649_get_mode,
	130
	131	};
	132
817d8c2d	133	static struct regulator_desc dcdc_desc = {
a71b797f HZ	134	.name = "max8649",
	135	.ops = &max8649_dcdc_ops,
	136	.type = REGULATOR_VOLTAGE,
	137	.n_voltages = 1 << 6,
	138	.owner = THIS_MODULE,
817d8c2d	139	.vsel_mask = MAX8649_VOL_MASK,
0fb737b5 AL	140	.min_uV = MAX8649_DCDC_VMIN,
0fb737b5 AL	141	.uV_step = MAX8649_DCDC_STEP,
ea88b132 AL	142	.enable_reg = MAX8649_CONTROL,
	143	.enable_mask = MAX8649_EN_PD,
	144	.enable_is_inverted = true,
a71b797f HZ	145	};
a71b797f HZ	146
c5b68d47 JC	147	static struct regmap_config max8649_regmap_config = {
	148	.reg_bits = 8,
	149	.val_bits = 8,
	150	};
	151
a5023574	152	static int max8649_regulator_probe(struct i2c_client *client,
a71b797f HZ	153	const struct i2c_device_id *id)
	154	{
	155	struct max8649_platform_data *pdata = client->dev.platform_data;
	156	struct max8649_regulator_info *info = NULL;
c172708d	157	struct regulator_config config = { };
c5b68d47	158	unsigned int val;
a71b797f HZ	159	unsigned char data;
	160	int ret;
	161
dc553a79 AL	162	info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
dc553a79 AL	163	GFP_KERNEL);
a71b797f HZ	164	if (!info) {
	165	dev_err(&client->dev, "No enough memory\n");
	166	return -ENOMEM;
	167	}
	168
dc553a79	169	info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
c5b68d47 JC	170	if (IS_ERR(info->regmap)) {
	171	ret = PTR_ERR(info->regmap);
	172	dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
dc553a79	173	return ret;
c5b68d47 JC	174	}
c5b68d47 JC	175
a71b797f	176	info->dev = &client->dev;
a71b797f HZ	177	i2c_set_clientdata(client, info);
	178
	179	info->mode = pdata->mode;
	180	switch (info->mode) {
	181	case 0:
817d8c2d	182	dcdc_desc.vsel_reg = MAX8649_MODE0;
a71b797f HZ	183	break;
a71b797f HZ	184	case 1:
817d8c2d	185	dcdc_desc.vsel_reg = MAX8649_MODE1;
a71b797f HZ	186	break;
a71b797f HZ	187	case 2:
817d8c2d	188	dcdc_desc.vsel_reg = MAX8649_MODE2;
a71b797f HZ	189	break;
a71b797f HZ	190	case 3:
817d8c2d	191	dcdc_desc.vsel_reg = MAX8649_MODE3;
a71b797f HZ	192	break;
	193	default:
	194	break;
	195	}
	196
c5b68d47 JC	197	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
c5b68d47 JC	198	if (ret != 0) {
a71b797f HZ	199	dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
a71b797f HZ	200	ret);
dc553a79	201	return ret;
a71b797f	202	}
da7de6a1	203	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
a71b797f HZ	204
a71b797f HZ	205	/* enable VID0 & VID1 */
c5b68d47	206	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
a71b797f HZ	207
	208	/* enable/disable external clock synchronization */
	209	info->extclk = pdata->extclk;
	210	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
817d8c2d AL	211	regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
817d8c2d AL	212	MAX8649_SYNC_EXTCLK, data);
a71b797f HZ	213	if (info->extclk) {
	214	/* set external clock frequency */
	215	info->extclk_freq = pdata->extclk_freq;
c5b68d47 JC	216	regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
c5b68d47 JC	217	info->extclk_freq << 6);
a71b797f HZ	218	}
	219
	220	if (pdata->ramp_timing) {
	221	info->ramp_timing = pdata->ramp_timing;
c5b68d47 JC	222	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
c5b68d47 JC	223	info->ramp_timing << 5);
a71b797f HZ	224	}
	225
	226	info->ramp_down = pdata->ramp_down;
	227	if (info->ramp_down) {
c5b68d47 JC	228	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
c5b68d47 JC	229	MAX8649_RAMP_DOWN);
a71b797f HZ	230	}
a71b797f HZ	231
c172708d MB	232	config.dev = &client->dev;
	233	config.init_data = pdata->regulator;
	234	config.driver_data = info;
61663171	235	config.regmap = info->regmap;
c172708d MB	236
c172708d MB	237	info->regulator = regulator_register(&dcdc_desc, &config);
a71b797f HZ	238	if (IS_ERR(info->regulator)) {
	239	dev_err(info->dev, "failed to register regulator %s\n",
	240	dcdc_desc.name);
dc553a79	241	return PTR_ERR(info->regulator);
a71b797f HZ	242	}
a71b797f HZ	243
a71b797f	244	return 0;
a71b797f HZ	245	}
a71b797f HZ	246
8dc995f5	247	static int max8649_regulator_remove(struct i2c_client *client)
a71b797f HZ	248	{
	249	struct max8649_regulator_info *info = i2c_get_clientdata(client);
	250
020501f1 AL	251	if (info)
020501f1 AL	252	regulator_unregister(info->regulator);
a71b797f HZ	253
	254	return 0;
	255	}
	256
	257	static const struct i2c_device_id max8649_id[] = {
	258	{ "max8649", 0 },
	259	{ }
	260	};
	261	MODULE_DEVICE_TABLE(i2c, max8649_id);
	262
	263	static struct i2c_driver max8649_driver = {
	264	.probe = max8649_regulator_probe,
5eb9f2b9	265	.remove = max8649_regulator_remove,
a71b797f HZ	266	.driver = {
	267	.name = "max8649",
	268	},
	269	.id_table = max8649_id,
	270	};
	271
	272	static int __init max8649_init(void)
	273	{
	274	return i2c_add_driver(&max8649_driver);
	275	}
	276	subsys_initcall(max8649_init);
	277
	278	static void __exit max8649_exit(void)
	279	{
	280	i2c_del_driver(&max8649_driver);
	281	}
	282	module_exit(max8649_exit);
	283
	284	/* Module information */
	285	MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
	286	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	287	MODULE_LICENSE("GPL");