[linux-2.6-block.git] / drivers / regulator / fan53555.c

/*
 * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
 *
 * Supported Part Numbers:
 * FAN53555UC00X/01X/03X/04X/05X
 *
 * Copyright (c) 2012 Marvell Technology Ltd.
 * Yunfan Zhang <yfzhang@marvell.com>
 *
 * This package 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/module.h>
#include <linux/param.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/regulator/fan53555.h>

/* Voltage setting */
#define FAN53555_VSEL0		0x00
#define FAN53555_VSEL1		0x01
/* Control register */
#define FAN53555_CONTROL	0x02
/* IC Type */
#define FAN53555_ID1		0x03
/* IC mask version */
#define FAN53555_ID2		0x04
/* Monitor register */
#define FAN53555_MONITOR	0x05

/* VSEL bit definitions */
#define VSEL_BUCK_EN	(1 << 7)
#define VSEL_MODE		(1 << 6)
#define VSEL_NSEL_MASK	0x3F
/* Chip ID and Verison */
#define DIE_ID		0x0F	/* ID1 */
#define DIE_REV		0x0F	/* ID2 */
/* Control bit definitions */
#define CTL_OUTPUT_DISCHG	(1 << 7)
#define CTL_SLEW_MASK		(0x7 << 4)
#define CTL_SLEW_SHIFT		4
#define CTL_RESET			(1 << 2)

#define FAN53555_NVOLTAGES	64	/* Numbers of voltages */

/* IC Type */
enum {
	FAN53555_CHIP_ID_00 = 0,
	FAN53555_CHIP_ID_01,
	FAN53555_CHIP_ID_02,
	FAN53555_CHIP_ID_03,
	FAN53555_CHIP_ID_04,
	FAN53555_CHIP_ID_05,
};

struct fan53555_device_info {
	struct regmap *regmap;
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regulator_init_data *regulator;
	/* IC Type and Rev */
	int chip_id;
	int chip_rev;
	/* Voltage setting register */
	unsigned int vol_reg;
	unsigned int sleep_reg;
	/* Voltage range and step(linear) */
	unsigned int vsel_min;
	unsigned int vsel_step;
	/* Voltage slew rate limiting */
	unsigned int slew_rate;
	/* Sleep voltage cache */
	unsigned int sleep_vol_cache;
};

static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	int ret;

	if (di->sleep_vol_cache == uV)
		return 0;
	ret = regulator_map_voltage_linear(rdev, uV, uV);
	if (ret < 0)
		return -EINVAL;
	ret = regmap_update_bits(di->regmap, di->sleep_reg,
					VSEL_NSEL_MASK, ret);
	if (ret < 0)
		return -EINVAL;
	/* Cache the sleep voltage setting.
	 * Might not be the real voltage which is rounded */
	di->sleep_vol_cache = uV;

	return 0;
}

static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(di->regmap, di->vol_reg,
				VSEL_MODE, VSEL_MODE);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret = 0;

	ret = regmap_read(di->regmap, di->vol_reg, &val);
	if (ret < 0)
		return ret;
	if (val & VSEL_MODE)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static struct regulator_ops fan53555_regulator_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.set_suspend_voltage = fan53555_set_suspend_voltage,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_mode = fan53555_set_mode,
	.get_mode = fan53555_get_mode,
};

/* For 00,01,03,05 options:
 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 * For 04 option:
 * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 * */
static int fan53555_device_setup(struct fan53555_device_info *di,
				struct fan53555_platform_data *pdata)
{
	unsigned int reg, data, mask;

	/* Setup voltage control register */
	switch (pdata->sleep_vsel_id) {
	case FAN53555_VSEL_ID_0:
		di->sleep_reg = FAN53555_VSEL0;
		di->vol_reg = FAN53555_VSEL1;
		break;
	case FAN53555_VSEL_ID_1:
		di->sleep_reg = FAN53555_VSEL1;
		di->vol_reg = FAN53555_VSEL0;
		break;
	default:
		dev_err(di->dev, "Invalid VSEL ID!\n");
		return -EINVAL;
	}
	/* Init voltage range and step */
	switch (di->chip_id) {
	case FAN53555_CHIP_ID_00:
	case FAN53555_CHIP_ID_01:
	case FAN53555_CHIP_ID_03:
	case FAN53555_CHIP_ID_05:
		di->vsel_min = 600000;
		di->vsel_step = 10000;
		break;
	case FAN53555_CHIP_ID_04:
		di->vsel_min = 603000;
		di->vsel_step = 12826;
		break;
	default:
		dev_err(di->dev,
			"Chip ID[%d]\n not supported!\n", di->chip_id);
		return -EINVAL;
	}
	/* Init slew rate */
	if (pdata->slew_rate & 0x7)
		di->slew_rate = pdata->slew_rate;
	else
		di->slew_rate = FAN53555_SLEW_RATE_64MV;
	reg = FAN53555_CONTROL;
	data = di->slew_rate << CTL_SLEW_SHIFT;
	mask = CTL_SLEW_MASK;
	return regmap_update_bits(di->regmap, reg, mask, data);
}

static int fan53555_regulator_register(struct fan53555_device_info *di,
			struct regulator_config *config)
{
	struct regulator_desc *rdesc = &di->desc;

	rdesc->name = "fan53555-reg";
	rdesc->ops = &fan53555_regulator_ops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = FAN53555_NVOLTAGES;
	rdesc->enable_reg = di->vol_reg;
	rdesc->enable_mask = VSEL_BUCK_EN;
	rdesc->min_uV = di->vsel_min;
	rdesc->uV_step = di->vsel_step;
	rdesc->vsel_reg = di->vol_reg;
	rdesc->vsel_mask = VSEL_NSEL_MASK;
	rdesc->owner = THIS_MODULE;

	di->rdev = regulator_register(&di->desc, config);
	return PTR_RET(di->rdev);

}

static struct regmap_config fan53555_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int fan53555_regulator_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct fan53555_device_info *di;
	struct fan53555_platform_data *pdata;
	struct regulator_config config = { };
	unsigned int val;
	int ret;

	pdata = client->dev.platform_data;
	if (!pdata || !pdata->regulator) {
		dev_err(&client->dev, "Platform data not found!\n");
		return -ENODEV;
	}

	di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
					GFP_KERNEL);
	if (!di) {
		dev_err(&client->dev, "Failed to allocate device info data!\n");
		return -ENOMEM;
	}
	di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
	if (IS_ERR(di->regmap)) {
		dev_err(&client->dev, "Failed to allocate regmap!\n");
		return PTR_ERR(di->regmap);
	}
	di->dev = &client->dev;
	di->regulator = pdata->regulator;
	i2c_set_clientdata(client, di);
	/* Get chip ID */
	ret = regmap_read(di->regmap, FAN53555_ID1, &val);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip ID!\n");
		return -ENODEV;
	}
	di->chip_id = val & DIE_ID;
	/* Get chip revision */
	ret = regmap_read(di->regmap, FAN53555_ID2, &val);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip Rev!\n");
		return -ENODEV;
	}
	di->chip_rev = val & DIE_REV;
	dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
				di->chip_id, di->chip_rev);
	/* Device init */
	ret = fan53555_device_setup(di, pdata);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to setup device!\n");
		return ret;
	}
	/* Register regulator */
	config.dev = di->dev;
	config.init_data = di->regulator;
	config.regmap = di->regmap;
	config.driver_data = di;
	ret = fan53555_regulator_register(di, &config);
	if (ret < 0)
		dev_err(&client->dev, "Failed to register regulator!\n");
	return ret;

}

static int fan53555_regulator_remove(struct i2c_client *client)
{
	struct fan53555_device_info *di = i2c_get_clientdata(client);

	regulator_unregister(di->rdev);
	return 0;
}

static const struct i2c_device_id fan53555_id[] = {
	{"fan53555", -1},
	{ },
};

static struct i2c_driver fan53555_regulator_driver = {
	.driver = {
		.name = "fan53555-regulator",
	},
	.probe = fan53555_regulator_probe,
	.remove = fan53555_regulator_remove,
	.id_table = fan53555_id,
};

module_i2c_driver(fan53555_regulator_driver);

MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
MODULE_DESCRIPTION("FAN53555 regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
49d8c599 YZ	1	/*
	2	* FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
	3	*
	4	* Supported Part Numbers:
	5	* FAN53555UC00X/01X/03X/04X/05X
	6	*
	7	* Copyright (c) 2012 Marvell Technology Ltd.
	8	* Yunfan Zhang <yfzhang@marvell.com>
	9	*
	10	* This package is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15	#include <linux/module.h>
	16	#include <linux/param.h>
	17	#include <linux/err.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/regulator/driver.h>
	20	#include <linux/regulator/machine.h>
	21	#include <linux/i2c.h>
	22	#include <linux/slab.h>
	23	#include <linux/regmap.h>
	24	#include <linux/regulator/fan53555.h>
	25
	26	/* Voltage setting */
	27	#define FAN53555_VSEL0 0x00
	28	#define FAN53555_VSEL1 0x01
	29	/* Control register */
	30	#define FAN53555_CONTROL 0x02
	31	/* IC Type */
	32	#define FAN53555_ID1 0x03
	33	/* IC mask version */
	34	#define FAN53555_ID2 0x04
	35	/* Monitor register */
	36	#define FAN53555_MONITOR 0x05
	37
	38	/* VSEL bit definitions */
	39	#define VSEL_BUCK_EN (1 << 7)
	40	#define VSEL_MODE (1 << 6)
	41	#define VSEL_NSEL_MASK 0x3F
	42	/* Chip ID and Verison */
	43	#define DIE_ID 0x0F /* ID1 */
	44	#define DIE_REV 0x0F /* ID2 */
	45	/* Control bit definitions */
	46	#define CTL_OUTPUT_DISCHG (1 << 7)
	47	#define CTL_SLEW_MASK (0x7 << 4)
	48	#define CTL_SLEW_SHIFT 4
	49	#define CTL_RESET (1 << 2)
	50
	51	#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
	52
	53	/* IC Type */
	54	enum {
	55	FAN53555_CHIP_ID_00 = 0,
	56	FAN53555_CHIP_ID_01,
	57	FAN53555_CHIP_ID_02,
	58	FAN53555_CHIP_ID_03,
	59	FAN53555_CHIP_ID_04,
	60	FAN53555_CHIP_ID_05,
	61	};
	62
	63	struct fan53555_device_info {
	64	struct regmap *regmap;
65	struct device *dev;
66	struct regulator_desc desc;
67	struct regulator_dev *rdev;
68	struct regulator_init_data *regulator;
69	/* IC Type and Rev */
70	int chip_id;
71	int chip_rev;
72	/* Voltage setting register */
73	unsigned int vol_reg;
74	unsigned int sleep_reg;
75	/* Voltage range and step(linear) */
76	unsigned int vsel_min;
49d8c599 YZ	77	unsigned int vsel_step;
	78	/* Voltage slew rate limiting */
	79	unsigned int slew_rate;
	80	/* Sleep voltage cache */
	81	unsigned int sleep_vol_cache;
	82	};
	83
	84	static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
	85	{
	86	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	87	int ret;
	88
	89	if (di->sleep_vol_cache == uV)
	90	return 0;
	91	ret = regulator_map_voltage_linear(rdev, uV, uV);
	92	if (ret < 0)
	93	return -EINVAL;
	94	ret = regmap_update_bits(di->regmap, di->sleep_reg,
	95	VSEL_NSEL_MASK, ret);
	96	if (ret < 0)
	97	return -EINVAL;
	98	/* Cache the sleep voltage setting.
	99	* Might not be the real voltage which is rounded */
	100	di->sleep_vol_cache = uV;
	101
	102	return 0;
	103	}
	104
	105	static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
	106	{
	107	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	108
	109	switch (mode) {
	110	case REGULATOR_MODE_FAST:
	111	regmap_update_bits(di->regmap, di->vol_reg,
	112	VSEL_MODE, VSEL_MODE);
	113	break;
	114	case REGULATOR_MODE_NORMAL:
	115	regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
	116	break;
	117	default:
	118	return -EINVAL;
	119	}
	120	return 0;
	121	}
	122
	123	static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
	124	{
	125	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	126	unsigned int val;
	127	int ret = 0;
	128
	129	ret = regmap_read(di->regmap, di->vol_reg, &val);
	130	if (ret < 0)
	131	return ret;
	132	if (val & VSEL_MODE)
	133	return REGULATOR_MODE_FAST;
	134	else
	135	return REGULATOR_MODE_NORMAL;
	136	}
	137
	138	static struct regulator_ops fan53555_regulator_ops = {
	139	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	140	.get_voltage_sel = regulator_get_voltage_sel_regmap,
141	.map_voltage = regulator_map_voltage_linear,
142	.list_voltage = regulator_list_voltage_linear,
143	.set_suspend_voltage = fan53555_set_suspend_voltage,
144	.enable = regulator_enable_regmap,
145	.disable = regulator_disable_regmap,
146	.is_enabled = regulator_is_enabled_regmap,
147	.set_mode = fan53555_set_mode,
148	.get_mode = fan53555_get_mode,
149	};
150
151	/* For 00,01,03,05 options:
152	* VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
153	* For 04 option:
154	* VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
155	* */
156	static int fan53555_device_setup(struct fan53555_device_info *di,
157	struct fan53555_platform_data *pdata)
158	{
159	unsigned int reg, data, mask;
160
161	/* Setup voltage control register */
162	switch (pdata->sleep_vsel_id) {
163	case FAN53555_VSEL_ID_0:
164	di->sleep_reg = FAN53555_VSEL0;
165	di->vol_reg = FAN53555_VSEL1;
166	break;
167	case FAN53555_VSEL_ID_1:
168	di->sleep_reg = FAN53555_VSEL1;
169	di->vol_reg = FAN53555_VSEL0;
170	break;
171	default:
172	dev_err(di->dev, "Invalid VSEL ID!\n");
173	return -EINVAL;
174	}
175	/* Init voltage range and step */
176	switch (di->chip_id) {
177	case FAN53555_CHIP_ID_00:
178	case FAN53555_CHIP_ID_01:
179	case FAN53555_CHIP_ID_03:
180	case FAN53555_CHIP_ID_05:
181	di->vsel_min = 600000;
49d8c599 YZ	182	di->vsel_step = 10000;
	183	break;
	184	case FAN53555_CHIP_ID_04:
	185	di->vsel_min = 603000;
49d8c599 YZ	186	di->vsel_step = 12826;
	187	break;
	188	default:
	189	dev_err(di->dev,
	190	"Chip ID[%d]\n not supported!\n", di->chip_id);
	191	return -EINVAL;
	192	}
	193	/* Init slew rate */
	194	if (pdata->slew_rate & 0x7)
	195	di->slew_rate = pdata->slew_rate;
	196	else
	197	di->slew_rate = FAN53555_SLEW_RATE_64MV;
	198	reg = FAN53555_CONTROL;
	199	data = di->slew_rate << CTL_SLEW_SHIFT;
	200	mask = CTL_SLEW_MASK;
	201	return regmap_update_bits(di->regmap, reg, mask, data);
	202	}
	203
	204	static int fan53555_regulator_register(struct fan53555_device_info *di,
	205	struct regulator_config *config)
	206	{
	207	struct regulator_desc *rdesc = &di->desc;
	208
	209	rdesc->name = "fan53555-reg";
	210	rdesc->ops = &fan53555_regulator_ops;
	211	rdesc->type = REGULATOR_VOLTAGE;
	212	rdesc->n_voltages = FAN53555_NVOLTAGES;
	213	rdesc->enable_reg = di->vol_reg;
	214	rdesc->enable_mask = VSEL_BUCK_EN;
	215	rdesc->min_uV = di->vsel_min;
	216	rdesc->uV_step = di->vsel_step;
	217	rdesc->vsel_reg = di->vol_reg;
	218	rdesc->vsel_mask = VSEL_NSEL_MASK;
	219	rdesc->owner = THIS_MODULE;
	220
	221	di->rdev = regulator_register(&di->desc, config);
eb8ad609	222	return PTR_RET(di->rdev);
49d8c599 YZ	223
	224	}
	225
	226	static struct regmap_config fan53555_regmap_config = {
	227	.reg_bits = 8,
	228	.val_bits = 8,
	229	};
	230
a5023574	231	static int fan53555_regulator_probe(struct i2c_client *client,
49d8c599 YZ	232	const struct i2c_device_id *id)
	233	{
	234	struct fan53555_device_info *di;
	235	struct fan53555_platform_data *pdata;
	236	struct regulator_config config = { };
	237	unsigned int val;
	238	int ret;
	239
	240	pdata = client->dev.platform_data;
	241	if (!pdata \|\| !pdata->regulator) {
	242	dev_err(&client->dev, "Platform data not found!\n");
	243	return -ENODEV;
	244	}
	245
	246	di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
	247	GFP_KERNEL);
	248	if (!di) {
	249	dev_err(&client->dev, "Failed to allocate device info data!\n");
	250	return -ENOMEM;
	251	}
	252	di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
	253	if (IS_ERR(di->regmap)) {
	254	dev_err(&client->dev, "Failed to allocate regmap!\n");
	255	return PTR_ERR(di->regmap);
	256	}
	257	di->dev = &client->dev;
	258	di->regulator = pdata->regulator;
	259	i2c_set_clientdata(client, di);
	260	/* Get chip ID */
	261	ret = regmap_read(di->regmap, FAN53555_ID1, &val);
	262	if (ret < 0) {
	263	dev_err(&client->dev, "Failed to get chip ID!\n");
	264	return -ENODEV;
	265	}
	266	di->chip_id = val & DIE_ID;
	267	/* Get chip revision */
	268	ret = regmap_read(di->regmap, FAN53555_ID2, &val);
	269	if (ret < 0) {
	270	dev_err(&client->dev, "Failed to get chip Rev!\n");
	271	return -ENODEV;
	272	}
	273	di->chip_rev = val & DIE_REV;
	274	dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
	275	di->chip_id, di->chip_rev);
	276	/* Device init */
	277	ret = fan53555_device_setup(di, pdata);
	278	if (ret < 0) {
	279	dev_err(&client->dev, "Failed to setup device!\n");
	280	return ret;
	281	}
	282	/* Register regulator */
	283	config.dev = di->dev;
	284	config.init_data = di->regulator;
	285	config.regmap = di->regmap;
	286	config.driver_data = di;
	287	ret = fan53555_regulator_register(di, &config);
	288	if (ret < 0)
	289	dev_err(&client->dev, "Failed to register regulator!\n");
	290	return ret;
	291
	292	}
	293
8dc995f5	294	static int fan53555_regulator_remove(struct i2c_client *client)
49d8c599 YZ	295	{
	296	struct fan53555_device_info *di = i2c_get_clientdata(client);
	297
	298	regulator_unregister(di->rdev);
	299	return 0;
	300	}
	301
	302	static const struct i2c_device_id fan53555_id[] = {
	303	{"fan53555", -1},
	304	{ },
	305	};
	306
	307	static struct i2c_driver fan53555_regulator_driver = {
	308	.driver = {
	309	.name = "fan53555-regulator",
	310	},
	311	.probe = fan53555_regulator_probe,
5eb9f2b9	312	.remove = fan53555_regulator_remove,
49d8c599 YZ	313	.id_table = fan53555_id,
	314	};
	315
	316	module_i2c_driver(fan53555_regulator_driver);
	317
	318	MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
	319	MODULE_DESCRIPTION("FAN53555 regulator driver");
	320	MODULE_LICENSE("GPL v2");