[net-next-2.6.git] / drivers / regulator / max8925-regulator.c

/*
 * Regulators driver for Maxim max8925
 *
 * 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/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max8925.h>

#define SD1_DVM_VMIN		850000
#define SD1_DVM_VMAX		1000000
#define SD1_DVM_STEP		50000
#define SD1_DVM_SHIFT		5		/* SDCTL1 bit5 */
#define SD1_DVM_EN		6		/* SDV1 bit 6 */

struct max8925_regulator_info {
	struct regulator_desc	desc;
	struct regulator_dev	*regulator;
	struct i2c_client	*i2c;
	struct max8925_chip	*chip;

	int	min_uV;
	int	max_uV;
	int	step_uV;
	int	vol_reg;
	int	vol_shift;
	int	vol_nbits;
	int	enable_bit;
	int	enable_reg;
};

static inline int check_range(struct max8925_regulator_info *info,
			      int min_uV, int max_uV)
{
	if (min_uV < info->min_uV || min_uV > info->max_uV)
		return -EINVAL;

	return 0;
}

static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	return info->min_uV + index * info->step_uV;
}

static int max8925_set_voltage(struct regulator_dev *rdev,
			       int min_uV, int max_uV)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;

	if (check_range(info, min_uV, max_uV)) {
		dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
			min_uV, max_uV);
		return -EINVAL;
	}
	data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
	data <<= info->vol_shift;
	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;

	return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
}

static int max8925_get_voltage(struct regulator_dev *rdev)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;
	int ret;

	ret = max8925_reg_read(info->i2c, info->vol_reg);
	if (ret < 0)
		return ret;
	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
	data = (ret & mask) >> info->vol_shift;

	return max8925_list_voltage(rdev, data);
}

static int max8925_enable(struct regulator_dev *rdev)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->enable_reg,
				1 << info->enable_bit,
				1 << info->enable_bit);
}

static int max8925_disable(struct regulator_dev *rdev)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->enable_reg,
				1 << info->enable_bit, 0);
}

static int max8925_is_enabled(struct regulator_dev *rdev)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	int ret;

	ret = max8925_reg_read(info->i2c, info->enable_reg);
	if (ret < 0)
		return ret;

	return ret & (1 << info->enable_bit);
}

static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;

	if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
		return -EINVAL;

	data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
	data <<= SD1_DVM_SHIFT;
	mask = 3 << SD1_DVM_SHIFT;

	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
}

static int max8925_set_dvm_enable(struct regulator_dev *rdev)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
				1 << SD1_DVM_EN);
}

static int max8925_set_dvm_disable(struct regulator_dev *rdev)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
}

static struct regulator_ops max8925_regulator_sdv_ops = {
	.set_voltage		= max8925_set_voltage,
	.get_voltage		= max8925_get_voltage,
	.enable			= max8925_enable,
	.disable		= max8925_disable,
	.is_enabled		= max8925_is_enabled,
	.set_suspend_voltage	= max8925_set_dvm_voltage,
	.set_suspend_enable	= max8925_set_dvm_enable,
	.set_suspend_disable	= max8925_set_dvm_disable,
};

static struct regulator_ops max8925_regulator_ldo_ops = {
	.set_voltage		= max8925_set_voltage,
	.get_voltage		= max8925_get_voltage,
	.enable			= max8925_enable,
	.disable		= max8925_disable,
	.is_enabled		= max8925_is_enabled,
};

#define MAX8925_SDV(_id, min, max, step)			\
{								\
	.desc	= {						\
		.name	= "SDV" #_id,				\
		.ops	= &max8925_regulator_sdv_ops,		\
		.type	= REGULATOR_VOLTAGE,			\
		.id	= MAX8925_ID_SD##_id,			\
		.owner	= THIS_MODULE,				\
	},							\
	.min_uV		= min * 1000,				\
	.max_uV		= max * 1000,				\
	.step_uV	= step * 1000,				\
	.vol_reg	= MAX8925_SDV##_id,			\
	.vol_shift	= 0,					\
	.vol_nbits	= 6,					\
	.enable_reg	= MAX8925_SDCTL##_id,			\
	.enable_bit	= 0,					\
}

#define MAX8925_LDO(_id, min, max, step)			\
{								\
	.desc	= {						\
		.name	= "LDO" #_id,				\
		.ops	= &max8925_regulator_ldo_ops,		\
		.type	= REGULATOR_VOLTAGE,			\
		.id	= MAX8925_ID_LDO##_id,			\
		.owner	= THIS_MODULE,				\
	},							\
	.min_uV		= min * 1000,				\
	.max_uV		= max * 1000,				\
	.step_uV	= step * 1000,				\
	.vol_reg	= MAX8925_LDOVOUT##_id,			\
	.vol_shift	= 0,					\
	.vol_nbits	= 6,					\
	.enable_reg	= MAX8925_LDOCTL##_id,			\
	.enable_bit	= 0,					\
}

static struct max8925_regulator_info max8925_regulator_info[] = {
	MAX8925_SDV(1, 637.5, 1425, 12.5),
	MAX8925_SDV(2,   650, 2225,   25),
	MAX8925_SDV(3,   750, 3900,   50),

	MAX8925_LDO(1,  750, 3900, 50),
	MAX8925_LDO(2,  650, 2250, 25),
	MAX8925_LDO(3,  650, 2250, 25),
	MAX8925_LDO(4,  750, 3900, 50),
	MAX8925_LDO(5,  750, 3900, 50),
	MAX8925_LDO(6,  750, 3900, 50),
	MAX8925_LDO(7,  750, 3900, 50),
	MAX8925_LDO(8,  750, 3900, 50),
	MAX8925_LDO(9,  750, 3900, 50),
	MAX8925_LDO(10, 750, 3900, 50),
	MAX8925_LDO(11, 750, 3900, 50),
	MAX8925_LDO(12, 750, 3900, 50),
	MAX8925_LDO(13, 750, 3900, 50),
	MAX8925_LDO(14, 750, 3900, 50),
	MAX8925_LDO(15, 750, 3900, 50),
	MAX8925_LDO(16, 750, 3900, 50),
	MAX8925_LDO(17, 650, 2250, 25),
	MAX8925_LDO(18, 650, 2250, 25),
	MAX8925_LDO(19, 750, 3900, 50),
	MAX8925_LDO(20, 750, 3900, 50),
};

static struct max8925_regulator_info * __devinit find_regulator_info(int id)
{
	struct max8925_regulator_info *ri;
	int i;

	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
		ri = &max8925_regulator_info[i];
		if (ri->desc.id == id)
			return ri;
	}
	return NULL;
}

static int __devinit max8925_regulator_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_platform_data *pdata = chip->dev->platform_data;
	struct max8925_regulator_info *ri;
	struct regulator_dev *rdev;

	ri = find_regulator_info(pdev->id);
	if (ri == NULL) {
		dev_err(&pdev->dev, "invalid regulator ID specified\n");
		return -EINVAL;
	}
	ri->i2c = chip->i2c;
	ri->chip = chip;

	rdev = regulator_register(&ri->desc, &pdev->dev,
				  pdata->regulator[pdev->id], ri);
	if (IS_ERR(rdev)) {
		dev_err(&pdev->dev, "failed to register regulator %s\n",
				ri->desc.name);
		return PTR_ERR(rdev);
	}

	platform_set_drvdata(pdev, rdev);
	return 0;
}

static int __devexit max8925_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);
	regulator_unregister(rdev);

	return 0;
}

static struct platform_driver max8925_regulator_driver = {
	.driver		= {
		.name	= "max8925-regulator",
		.owner	= THIS_MODULE,
	},
	.probe		= max8925_regulator_probe,
	.remove		= __devexit_p(max8925_regulator_remove),
};

static int __init max8925_regulator_init(void)
{
	return platform_driver_register(&max8925_regulator_driver);
}
subsys_initcall(max8925_regulator_init);

static void __exit max8925_regulator_exit(void)
{
	platform_driver_unregister(&max8925_regulator_driver);
}
module_exit(max8925_regulator_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
MODULE_ALIAS("platform:max8925-regulator");
Commit	Line	Data
08ff6f2a HZ	1	/*
	2	* Regulators driver for Maxim max8925
	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	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/err.h>
	14	#include <linux/i2c.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regulator/driver.h>
	17	#include <linux/regulator/machine.h>
	18	#include <linux/mfd/max8925.h>
	19
	20	#define SD1_DVM_VMIN 850000
	21	#define SD1_DVM_VMAX 1000000
	22	#define SD1_DVM_STEP 50000
	23	#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
	24	#define SD1_DVM_EN 6 /* SDV1 bit 6 */
	25
	26	struct max8925_regulator_info {
	27	struct regulator_desc desc;
	28	struct regulator_dev *regulator;
	29	struct i2c_client *i2c;
	30	struct max8925_chip *chip;
	31
	32	int min_uV;
	33	int max_uV;
	34	int step_uV;
	35	int vol_reg;
	36	int vol_shift;
	37	int vol_nbits;
	38	int enable_bit;
	39	int enable_reg;
	40	};
	41
	42	static inline int check_range(struct max8925_regulator_info *info,
	43	int min_uV, int max_uV)
	44	{
	45	if (min_uV < info->min_uV \|\| min_uV > info->max_uV)
	46	return -EINVAL;
	47
	48	return 0;
	49	}
	50
	51	static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
	52	{
	53	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	54	return info->min_uV + index * info->step_uV;
	55	}
	56
	57	static int max8925_set_voltage(struct regulator_dev *rdev,
	58	int min_uV, int max_uV)
	59	{
	60	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	61	unsigned char data, mask;
	62
	63	if (check_range(info, min_uV, max_uV)) {
	64	dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
65	min_uV, max_uV);
66	return -EINVAL;
67	}
68	data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
69	data <<= info->vol_shift;
70	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
71
72	return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
73	}
74
75	static int max8925_get_voltage(struct regulator_dev *rdev)
76	{
77	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
78	unsigned char data, mask;
79	int ret;
80
81	ret = max8925_reg_read(info->i2c, info->vol_reg);
82	if (ret < 0)
83	return ret;
84	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
85	data = (ret & mask) >> info->vol_shift;
86
87	return max8925_list_voltage(rdev, data);
88	}
89
90	static int max8925_enable(struct regulator_dev *rdev)
91	{
92	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
93
94	return max8925_set_bits(info->i2c, info->enable_reg,
95	1 << info->enable_bit,
96	1 << info->enable_bit);
97	}
98
99	static int max8925_disable(struct regulator_dev *rdev)
100	{
101	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
102
103	return max8925_set_bits(info->i2c, info->enable_reg,
104	1 << info->enable_bit, 0);
105	}
106
107	static int max8925_is_enabled(struct regulator_dev *rdev)
108	{
109	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
110	int ret;
111
4b99fef0	112	ret = max8925_reg_read(info->i2c, info->enable_reg);
08ff6f2a HZ	113	if (ret < 0)
	114	return ret;
	115
	116	return ret & (1 << info->enable_bit);
	117	}
	118
	119	static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
	120	{
	121	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	122	unsigned char data, mask;
	123
	124	if (uV < SD1_DVM_VMIN \|\| uV > SD1_DVM_VMAX)
	125	return -EINVAL;
	126
	127	data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
	128	data <<= SD1_DVM_SHIFT;
	129	mask = 3 << SD1_DVM_SHIFT;
	130
	131	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
	132	}
	133
	134	static int max8925_set_dvm_enable(struct regulator_dev *rdev)
	135	{
	136	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	137
	138	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
	139	1 << SD1_DVM_EN);
	140	}
	141
	142	static int max8925_set_dvm_disable(struct regulator_dev *rdev)
	143	{
	144	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	145
	146	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
	147	}
	148
	149	static struct regulator_ops max8925_regulator_sdv_ops = {
	150	.set_voltage = max8925_set_voltage,
	151	.get_voltage = max8925_get_voltage,
	152	.enable = max8925_enable,
	153	.disable = max8925_disable,
	154	.is_enabled = max8925_is_enabled,
	155	.set_suspend_voltage = max8925_set_dvm_voltage,
	156	.set_suspend_enable = max8925_set_dvm_enable,
	157	.set_suspend_disable = max8925_set_dvm_disable,
	158	};
	159
	160	static struct regulator_ops max8925_regulator_ldo_ops = {
	161	.set_voltage = max8925_set_voltage,
	162	.get_voltage = max8925_get_voltage,
	163	.enable = max8925_enable,
	164	.disable = max8925_disable,
	165	.is_enabled = max8925_is_enabled,
	166	};
	167
	168	#define MAX8925_SDV(_id, min, max, step) \
	169	{ \
	170	.desc = { \
	171	.name = "SDV" #_id, \
	172	.ops = &max8925_regulator_sdv_ops, \
	173	.type = REGULATOR_VOLTAGE, \
	174	.id = MAX8925_ID_SD##_id, \
	175	.owner = THIS_MODULE, \
	176	}, \
177	.min_uV = min * 1000, \
178	.max_uV = max * 1000, \
179	.step_uV = step * 1000, \
180	.vol_reg = MAX8925_SDV##_id, \
181	.vol_shift = 0, \
182	.vol_nbits = 6, \
183	.enable_reg = MAX8925_SDCTL##_id, \
184	.enable_bit = 0, \
185	}
186
187	#define MAX8925_LDO(_id, min, max, step) \
188	{ \
189	.desc = { \
190	.name = "LDO" #_id, \
191	.ops = &max8925_regulator_ldo_ops, \
192	.type = REGULATOR_VOLTAGE, \
193	.id = MAX8925_ID_LDO##_id, \
194	.owner = THIS_MODULE, \
195	}, \
196	.min_uV = min * 1000, \
197	.max_uV = max * 1000, \
198	.step_uV = step * 1000, \
199	.vol_reg = MAX8925_LDOVOUT##_id, \
200	.vol_shift = 0, \
201	.vol_nbits = 6, \
202	.enable_reg = MAX8925_LDOCTL##_id, \
203	.enable_bit = 0, \
204	}
205
206	static struct max8925_regulator_info max8925_regulator_info[] = {
207	MAX8925_SDV(1, 637.5, 1425, 12.5),
208	MAX8925_SDV(2, 650, 2225, 25),
209	MAX8925_SDV(3, 750, 3900, 50),
210
211	MAX8925_LDO(1, 750, 3900, 50),
212	MAX8925_LDO(2, 650, 2250, 25),
213	MAX8925_LDO(3, 650, 2250, 25),
214	MAX8925_LDO(4, 750, 3900, 50),
215	MAX8925_LDO(5, 750, 3900, 50),
216	MAX8925_LDO(6, 750, 3900, 50),
217	MAX8925_LDO(7, 750, 3900, 50),
218	MAX8925_LDO(8, 750, 3900, 50),
219	MAX8925_LDO(9, 750, 3900, 50),
220	MAX8925_LDO(10, 750, 3900, 50),
221	MAX8925_LDO(11, 750, 3900, 50),
222	MAX8925_LDO(12, 750, 3900, 50),
223	MAX8925_LDO(13, 750, 3900, 50),
224	MAX8925_LDO(14, 750, 3900, 50),
225	MAX8925_LDO(15, 750, 3900, 50),
226	MAX8925_LDO(16, 750, 3900, 50),
227	MAX8925_LDO(17, 650, 2250, 25),
228	MAX8925_LDO(18, 650, 2250, 25),
229	MAX8925_LDO(19, 750, 3900, 50),
230	MAX8925_LDO(20, 750, 3900, 50),
231	};
232
3fff6c04	233	static struct max8925_regulator_info * __devinit find_regulator_info(int id)
08ff6f2a HZ	234	{
	235	struct max8925_regulator_info *ri;
	236	int i;
	237
	238	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
	239	ri = &max8925_regulator_info[i];
	240	if (ri->desc.id == id)
	241	return ri;
	242	}
	243	return NULL;
	244	}
	245
	246	static int __devinit max8925_regulator_probe(struct platform_device *pdev)
	247	{
	248	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	249	struct max8925_platform_data *pdata = chip->dev->platform_data;
3fff6c04	250	struct max8925_regulator_info *ri;
08ff6f2a HZ	251	struct regulator_dev *rdev;
	252
	253	ri = find_regulator_info(pdev->id);
	254	if (ri == NULL) {
	255	dev_err(&pdev->dev, "invalid regulator ID specified\n");
	256	return -EINVAL;
	257	}
	258	ri->i2c = chip->i2c;
	259	ri->chip = chip;
	260
	261	rdev = regulator_register(&ri->desc, &pdev->dev,
	262	pdata->regulator[pdev->id], ri);
	263	if (IS_ERR(rdev)) {
	264	dev_err(&pdev->dev, "failed to register regulator %s\n",
	265	ri->desc.name);
	266	return PTR_ERR(rdev);
	267	}
	268
	269	platform_set_drvdata(pdev, rdev);
	270	return 0;
	271	}
	272
	273	static int __devexit max8925_regulator_remove(struct platform_device *pdev)
	274	{
	275	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	276
3fff6c04	277	platform_set_drvdata(pdev, NULL);
08ff6f2a	278	regulator_unregister(rdev);
3fff6c04	279
08ff6f2a HZ	280	return 0;
	281	}
	282
	283	static struct platform_driver max8925_regulator_driver = {
	284	.driver = {
	285	.name = "max8925-regulator",
	286	.owner = THIS_MODULE,
	287	},
	288	.probe = max8925_regulator_probe,
	289	.remove = __devexit_p(max8925_regulator_remove),
	290	};
	291
	292	static int __init max8925_regulator_init(void)
	293	{
	294	return platform_driver_register(&max8925_regulator_driver);
	295	}
	296	subsys_initcall(max8925_regulator_init);
	297
	298	static void __exit max8925_regulator_exit(void)
	299	{
	300	platform_driver_unregister(&max8925_regulator_driver);
	301	}
	302	module_exit(max8925_regulator_exit);
	303
	304	MODULE_LICENSE("GPL");
	305	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	306	MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
	307	MODULE_ALIAS("platform:max8925-regulator");
	308