[deliverable/linux.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 */

/* bit definitions in SD & LDO control registers */
#define OUT_ENABLE   		0x1f		/* Power U/D sequence as I2C */
#define OUT_DISABLE		0x1e		/* Power U/D sequence as I2C */

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, unsigned int *selector)
{
	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;
	*selector = data;
	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,
				OUT_ENABLE << info->enable_bit,
				OUT_ENABLE << 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,
				OUT_ENABLE << info->enable_bit,
				OUT_DISABLE << info->enable_bit);
}

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
db13c040 HZ	26	/* bit definitions in SD & LDO control registers */
	27	#define OUT_ENABLE 0x1f /* Power U/D sequence as I2C */
	28	#define OUT_DISABLE 0x1e /* Power U/D sequence as I2C */
	29
08ff6f2a HZ	30	struct max8925_regulator_info {
	31	struct regulator_desc desc;
	32	struct regulator_dev *regulator;
	33	struct i2c_client *i2c;
	34	struct max8925_chip *chip;
	35
	36	int min_uV;
	37	int max_uV;
	38	int step_uV;
	39	int vol_reg;
	40	int vol_shift;
	41	int vol_nbits;
	42	int enable_bit;
	43	int enable_reg;
	44	};
	45
	46	static inline int check_range(struct max8925_regulator_info *info,
	47	int min_uV, int max_uV)
	48	{
	49	if (min_uV < info->min_uV \|\| min_uV > info->max_uV)
	50	return -EINVAL;
	51
	52	return 0;
	53	}
	54
	55	static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
	56	{
	57	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	58	return info->min_uV + index * info->step_uV;
	59	}
	60
	61	static int max8925_set_voltage(struct regulator_dev *rdev,
3a93f2a9	62	int min_uV, int max_uV, unsigned int *selector)
08ff6f2a HZ	63	{
	64	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	65	unsigned char data, mask;
	66
	67	if (check_range(info, min_uV, max_uV)) {
	68	dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
	69	min_uV, max_uV);
	70	return -EINVAL;
	71	}
	72	data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
3a93f2a9	73	*selector = data;
08ff6f2a HZ	74	data <<= info->vol_shift;
	75	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
	76
	77	return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
	78	}
	79
	80	static int max8925_get_voltage(struct regulator_dev *rdev)
	81	{
	82	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	83	unsigned char data, mask;
	84	int ret;
	85
	86	ret = max8925_reg_read(info->i2c, info->vol_reg);
	87	if (ret < 0)
	88	return ret;
	89	mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
	90	data = (ret & mask) >> info->vol_shift;
	91
	92	return max8925_list_voltage(rdev, data);
	93	}
	94
	95	static int max8925_enable(struct regulator_dev *rdev)
	96	{
	97	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	98
	99	return max8925_set_bits(info->i2c, info->enable_reg,
db13c040 HZ	100	OUT_ENABLE << info->enable_bit,
db13c040 HZ	101	OUT_ENABLE << info->enable_bit);
08ff6f2a HZ	102	}
	103
	104	static int max8925_disable(struct regulator_dev *rdev)
	105	{
	106	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	107
	108	return max8925_set_bits(info->i2c, info->enable_reg,
db13c040 HZ	109	OUT_ENABLE << info->enable_bit,
db13c040 HZ	110	OUT_DISABLE << info->enable_bit);
08ff6f2a HZ	111	}
	112
	113	static int max8925_is_enabled(struct regulator_dev *rdev)
	114	{
	115	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	116	int ret;
	117
4b99fef0	118	ret = max8925_reg_read(info->i2c, info->enable_reg);
08ff6f2a HZ	119	if (ret < 0)
	120	return ret;
	121
	122	return ret & (1 << info->enable_bit);
	123	}
	124
	125	static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
	126	{
	127	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	128	unsigned char data, mask;
	129
	130	if (uV < SD1_DVM_VMIN \|\| uV > SD1_DVM_VMAX)
	131	return -EINVAL;
	132
	133	data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
	134	data <<= SD1_DVM_SHIFT;
	135	mask = 3 << SD1_DVM_SHIFT;
	136
	137	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
	138	}
	139
	140	static int max8925_set_dvm_enable(struct regulator_dev *rdev)
	141	{
	142	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	143
	144	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
	145	1 << SD1_DVM_EN);
	146	}
	147
	148	static int max8925_set_dvm_disable(struct regulator_dev *rdev)
	149	{
	150	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	151
	152	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
	153	}
	154
	155	static struct regulator_ops max8925_regulator_sdv_ops = {
	156	.set_voltage = max8925_set_voltage,
	157	.get_voltage = max8925_get_voltage,
	158	.enable = max8925_enable,
	159	.disable = max8925_disable,
	160	.is_enabled = max8925_is_enabled,
	161	.set_suspend_voltage = max8925_set_dvm_voltage,
	162	.set_suspend_enable = max8925_set_dvm_enable,
	163	.set_suspend_disable = max8925_set_dvm_disable,
	164	};
	165
	166	static struct regulator_ops max8925_regulator_ldo_ops = {
	167	.set_voltage = max8925_set_voltage,
	168	.get_voltage = max8925_get_voltage,
	169	.enable = max8925_enable,
	170	.disable = max8925_disable,
	171	.is_enabled = max8925_is_enabled,
	172	};
	173
	174	#define MAX8925_SDV(_id, min, max, step) \
	175	{ \
	176	.desc = { \
	177	.name = "SDV" #_id, \
	178	.ops = &max8925_regulator_sdv_ops, \
	179	.type = REGULATOR_VOLTAGE, \
	180	.id = MAX8925_ID_SD##_id, \
	181	.owner = THIS_MODULE, \
	182	}, \
183	.min_uV = min * 1000, \
184	.max_uV = max * 1000, \
185	.step_uV = step * 1000, \
186	.vol_reg = MAX8925_SDV##_id, \
187	.vol_shift = 0, \
188	.vol_nbits = 6, \
189	.enable_reg = MAX8925_SDCTL##_id, \
190	.enable_bit = 0, \
191	}
192
193	#define MAX8925_LDO(_id, min, max, step) \
194	{ \
195	.desc = { \
196	.name = "LDO" #_id, \
197	.ops = &max8925_regulator_ldo_ops, \
198	.type = REGULATOR_VOLTAGE, \
199	.id = MAX8925_ID_LDO##_id, \
200	.owner = THIS_MODULE, \
201	}, \
202	.min_uV = min * 1000, \
203	.max_uV = max * 1000, \
204	.step_uV = step * 1000, \
205	.vol_reg = MAX8925_LDOVOUT##_id, \
206	.vol_shift = 0, \
207	.vol_nbits = 6, \
208	.enable_reg = MAX8925_LDOCTL##_id, \
209	.enable_bit = 0, \
210	}
211
212	static struct max8925_regulator_info max8925_regulator_info[] = {
213	MAX8925_SDV(1, 637.5, 1425, 12.5),
214	MAX8925_SDV(2, 650, 2225, 25),
215	MAX8925_SDV(3, 750, 3900, 50),
216
217	MAX8925_LDO(1, 750, 3900, 50),
218	MAX8925_LDO(2, 650, 2250, 25),
219	MAX8925_LDO(3, 650, 2250, 25),
220	MAX8925_LDO(4, 750, 3900, 50),
221	MAX8925_LDO(5, 750, 3900, 50),
222	MAX8925_LDO(6, 750, 3900, 50),
223	MAX8925_LDO(7, 750, 3900, 50),
224	MAX8925_LDO(8, 750, 3900, 50),
225	MAX8925_LDO(9, 750, 3900, 50),
226	MAX8925_LDO(10, 750, 3900, 50),
227	MAX8925_LDO(11, 750, 3900, 50),
228	MAX8925_LDO(12, 750, 3900, 50),
229	MAX8925_LDO(13, 750, 3900, 50),
230	MAX8925_LDO(14, 750, 3900, 50),
231	MAX8925_LDO(15, 750, 3900, 50),
232	MAX8925_LDO(16, 750, 3900, 50),
233	MAX8925_LDO(17, 650, 2250, 25),
234	MAX8925_LDO(18, 650, 2250, 25),
235	MAX8925_LDO(19, 750, 3900, 50),
236	MAX8925_LDO(20, 750, 3900, 50),
237	};
238
3fff6c04	239	static struct max8925_regulator_info * __devinit find_regulator_info(int id)
08ff6f2a HZ	240	{
	241	struct max8925_regulator_info *ri;
	242	int i;
	243
	244	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
	245	ri = &max8925_regulator_info[i];
	246	if (ri->desc.id == id)
	247	return ri;
	248	}
	249	return NULL;
	250	}
	251
	252	static int __devinit max8925_regulator_probe(struct platform_device *pdev)
	253	{
	254	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	255	struct max8925_platform_data *pdata = chip->dev->platform_data;
3fff6c04	256	struct max8925_regulator_info *ri;
08ff6f2a HZ	257	struct regulator_dev *rdev;
	258
	259	ri = find_regulator_info(pdev->id);
	260	if (ri == NULL) {
	261	dev_err(&pdev->dev, "invalid regulator ID specified\n");
	262	return -EINVAL;
	263	}
	264	ri->i2c = chip->i2c;
	265	ri->chip = chip;
	266
	267	rdev = regulator_register(&ri->desc, &pdev->dev,
	268	pdata->regulator[pdev->id], ri);
	269	if (IS_ERR(rdev)) {
	270	dev_err(&pdev->dev, "failed to register regulator %s\n",
	271	ri->desc.name);
	272	return PTR_ERR(rdev);
	273	}
	274
	275	platform_set_drvdata(pdev, rdev);
	276	return 0;
	277	}
	278
	279	static int __devexit max8925_regulator_remove(struct platform_device *pdev)
	280	{
	281	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	282
3fff6c04	283	platform_set_drvdata(pdev, NULL);
08ff6f2a	284	regulator_unregister(rdev);
3fff6c04	285
08ff6f2a HZ	286	return 0;
	287	}
	288
	289	static struct platform_driver max8925_regulator_driver = {
	290	.driver = {
	291	.name = "max8925-regulator",
	292	.owner = THIS_MODULE,
	293	},
	294	.probe = max8925_regulator_probe,
	295	.remove = __devexit_p(max8925_regulator_remove),
	296	};
	297
	298	static int __init max8925_regulator_init(void)
	299	{
	300	return platform_driver_register(&max8925_regulator_driver);
	301	}
	302	subsys_initcall(max8925_regulator_init);
	303
	304	static void __exit max8925_regulator_exit(void)
	305	{
	306	platform_driver_unregister(&max8925_regulator_driver);
	307	}
	308	module_exit(max8925_regulator_exit);
	309
	310	MODULE_LICENSE("GPL");
	311	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	312	MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
	313	MODULE_ALIAS("platform:max8925-regulator");
	314