[deliverable/linux.git] / drivers / regulator / act8865-regulator.c

/*
 * act8865-regulator.c - Voltage regulation for active-semi ACT88xx PMUs
 *
 * http://www.active-semi.com/products/power-management-units/act88xx/
 *
 * Copyright (C) 2013 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/act8865.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>

/*
 * ACT8865 Global Register Map.
 */
#define	ACT8865_SYS_MODE	0x00
#define	ACT8865_SYS_CTRL	0x01
#define	ACT8865_DCDC1_VSET1	0x20
#define	ACT8865_DCDC1_VSET2	0x21
#define	ACT8865_DCDC1_CTRL	0x22
#define	ACT8865_DCDC2_VSET1	0x30
#define	ACT8865_DCDC2_VSET2	0x31
#define	ACT8865_DCDC2_CTRL	0x32
#define	ACT8865_DCDC3_VSET1	0x40
#define	ACT8865_DCDC3_VSET2	0x41
#define	ACT8865_DCDC3_CTRL	0x42
#define	ACT8865_LDO1_VSET	0x50
#define	ACT8865_LDO1_CTRL	0x51
#define	ACT8865_LDO2_VSET	0x54
#define	ACT8865_LDO2_CTRL	0x55
#define	ACT8865_LDO3_VSET	0x60
#define	ACT8865_LDO3_CTRL	0x61
#define	ACT8865_LDO4_VSET	0x64
#define	ACT8865_LDO4_CTRL	0x65

/*
 * Field Definitions.
 */
#define	ACT8865_ENA		0x80	/* ON - [7] */
#define	ACT8865_VSEL_MASK	0x3F	/* VSET - [5:0] */

/*
 * ACT8865 voltage number
 */
#define	ACT8865_VOLTAGE_NUM	64

struct act8865 {
	struct regmap *regmap;
};

static const struct regmap_config act8865_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static const struct regulator_linear_range act8865_voltage_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
};

static struct regulator_ops act8865_ops = {
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.is_enabled		= regulator_is_enabled_regmap,
};

#define ACT88xx_REG(_name, _family, _id, _vsel_reg)			\
	[_family##_ID_##_id] = {					\
		.name			= _name,			\
		.id			= _family##_ID_##_id,		\
		.type			= REGULATOR_VOLTAGE,		\
		.ops			= &act8865_ops,			\
		.n_voltages		= ACT8865_VOLTAGE_NUM,		\
		.linear_ranges		= act8865_voltage_ranges,	\
		.n_linear_ranges	= ARRAY_SIZE(act8865_voltage_ranges), \
		.vsel_reg		= _family##_##_id##_##_vsel_reg, \
		.vsel_mask		= ACT8865_VSEL_MASK,		\
		.enable_reg		= _family##_##_id##_CTRL,	\
		.enable_mask		= ACT8865_ENA,			\
		.owner			= THIS_MODULE,			\
	}

static const struct regulator_desc act8865_regulators[] = {
	ACT88xx_REG("DCDC_REG1", ACT8865, DCDC1, VSET1),
	ACT88xx_REG("DCDC_REG2", ACT8865, DCDC2, VSET1),
	ACT88xx_REG("DCDC_REG3", ACT8865, DCDC3, VSET1),
	ACT88xx_REG("LDO_REG1", ACT8865, LDO1, VSET),
	ACT88xx_REG("LDO_REG2", ACT8865, LDO2, VSET),
	ACT88xx_REG("LDO_REG3", ACT8865, LDO3, VSET),
	ACT88xx_REG("LDO_REG4", ACT8865, LDO4, VSET),
};

#ifdef CONFIG_OF
static const struct of_device_id act8865_dt_ids[] = {
	{ .compatible = "active-semi,act8865", .data = (void *)ACT8865 },
	{ }
};
MODULE_DEVICE_TABLE(of, act8865_dt_ids);

static struct of_regulator_match act8865_matches[] = {
	[ACT8865_ID_DCDC1]	= { .name = "DCDC_REG1"},
	[ACT8865_ID_DCDC2]	= { .name = "DCDC_REG2"},
	[ACT8865_ID_DCDC3]	= { .name = "DCDC_REG3"},
	[ACT8865_ID_LDO1]	= { .name = "LDO_REG1"},
	[ACT8865_ID_LDO2]	= { .name = "LDO_REG2"},
	[ACT8865_ID_LDO3]	= { .name = "LDO_REG3"},
	[ACT8865_ID_LDO4]	= { .name = "LDO_REG4"},
};

static int act8865_pdata_from_dt(struct device *dev,
				 struct device_node **of_node,
				 struct act8865_platform_data *pdata,
				 struct of_regulator_match *matches,
				 int num_matches)
{
	int matched, i;
	struct device_node *np;
	struct act8865_regulator_data *regulator;

	np = of_get_child_by_name(dev->of_node, "regulators");
	if (!np) {
		dev_err(dev, "missing 'regulators' subnode in DT\n");
		return -EINVAL;
	}

	matched = of_regulator_match(dev, np, matches, num_matches);
	of_node_put(np);
	if (matched <= 0)
		return matched;

	pdata->regulators = devm_kzalloc(dev,
					 sizeof(struct act8865_regulator_data) *
					 num_matches, GFP_KERNEL);
	if (!pdata->regulators)
		return -ENOMEM;

	pdata->num_regulators = num_matches;
	regulator = pdata->regulators;

	for (i = 0; i < num_matches; i++) {
		regulator->id = i;
		regulator->name = matches[i].name;
		regulator->platform_data = matches[i].init_data;
		of_node[i] = matches[i].of_node;
		regulator++;
	}

	return 0;
}
#else
static inline int act8865_pdata_from_dt(struct device *dev,
					struct device_node **of_node,
					struct act8865_platform_data *pdata)
{
	return 0;
}
#endif

static struct regulator_init_data
*act8865_get_init_data(int id, struct act8865_platform_data *pdata)
{
	int i;

	if (!pdata)
		return NULL;

	for (i = 0; i < pdata->num_regulators; i++) {
		if (pdata->regulators[i].id == id)
			return pdata->regulators[i].platform_data;
	}

	return NULL;
}

static int act8865_pmic_probe(struct i2c_client *client,
			      const struct i2c_device_id *i2c_id)
{
	static const struct regulator_desc *regulators;
	struct act8865_platform_data pdata_of, *pdata;
	struct of_regulator_match *matches;
	struct device *dev = &client->dev;
	struct device_node **of_node;
	int i, ret, num_regulators;
	struct act8865 *act8865;
	unsigned long type;

	pdata = dev_get_platdata(dev);

	if (dev->of_node && !pdata) {
		const struct of_device_id *id;

		id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
		if (!id)
			return -ENODEV;

		type = (unsigned long) id->data;
	} else {
		type = i2c_id->driver_data;
	}

	switch (type) {
	case ACT8865:
		matches = act8865_matches;
		regulators = act8865_regulators;
		num_regulators = ARRAY_SIZE(act8865_regulators);
		break;
	default:
		dev_err(dev, "invalid device id %lu\n", type);
		return -EINVAL;
	}

	of_node = devm_kzalloc(dev, sizeof(struct device_node *) *
			       num_regulators, GFP_KERNEL);
	if (!of_node)
		return -ENOMEM;

	if (dev->of_node && !pdata) {
		ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, matches,
					    num_regulators);
		if (ret < 0)
			return ret;

		pdata = &pdata_of;
	}

	if (pdata->num_regulators > num_regulators) {
		dev_err(dev, "too many regulators: %d\n",
			pdata->num_regulators);
		return -EINVAL;
	}

	act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
	if (!act8865)
		return -ENOMEM;

	act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
	if (IS_ERR(act8865->regmap)) {
		ret = PTR_ERR(act8865->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	/* Finally register devices */
	for (i = 0; i < num_regulators; i++) {
		const struct regulator_desc *desc = &regulators[i];
		struct regulator_config config = { };
		struct regulator_dev *rdev;

		config.dev = dev;
		config.init_data = act8865_get_init_data(desc->id, pdata);
		config.of_node = of_node[i];
		config.driver_data = act8865;
		config.regmap = act8865->regmap;

		rdev = devm_regulator_register(&client->dev, desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(dev, "failed to register %s\n", desc->name);
			return PTR_ERR(rdev);
		}
	}

	i2c_set_clientdata(client, act8865);
	devm_kfree(dev, of_node);

	return 0;
}

static const struct i2c_device_id act8865_ids[] = {
	{ .name = "act8865", .driver_data = ACT8865 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, act8865_ids);

static struct i2c_driver act8865_pmic_driver = {
	.driver	= {
		.name	= "act8865",
		.owner	= THIS_MODULE,
	},
	.probe		= act8865_pmic_probe,
	.id_table	= act8865_ids,
};

module_i2c_driver(act8865_pmic_driver);

MODULE_DESCRIPTION("active-semi act88xx voltage regulator driver");
MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
33036f48	1	/*
50a03e35 BG	2	* act8865-regulator.c - Voltage regulation for active-semi ACT88xx PMUs
	3	*
	4	* http://www.active-semi.com/products/power-management-units/act88xx/
33036f48 WY	5	*
	6	* Copyright (C) 2013 Atmel Corporation
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/i2c.h>
	22	#include <linux/err.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/regulator/driver.h>
	25	#include <linux/regulator/act8865.h>
	26	#include <linux/of.h>
	27	#include <linux/of_device.h>
	28	#include <linux/regulator/of_regulator.h>
	29	#include <linux/regmap.h>
	30
	31	/*
	32	* ACT8865 Global Register Map.
	33	*/
	34	#define ACT8865_SYS_MODE 0x00
	35	#define ACT8865_SYS_CTRL 0x01
	36	#define ACT8865_DCDC1_VSET1 0x20
	37	#define ACT8865_DCDC1_VSET2 0x21
	38	#define ACT8865_DCDC1_CTRL 0x22
	39	#define ACT8865_DCDC2_VSET1 0x30
	40	#define ACT8865_DCDC2_VSET2 0x31
	41	#define ACT8865_DCDC2_CTRL 0x32
	42	#define ACT8865_DCDC3_VSET1 0x40
	43	#define ACT8865_DCDC3_VSET2 0x41
	44	#define ACT8865_DCDC3_CTRL 0x42
	45	#define ACT8865_LDO1_VSET 0x50
	46	#define ACT8865_LDO1_CTRL 0x51
	47	#define ACT8865_LDO2_VSET 0x54
	48	#define ACT8865_LDO2_CTRL 0x55
	49	#define ACT8865_LDO3_VSET 0x60
	50	#define ACT8865_LDO3_CTRL 0x61
	51	#define ACT8865_LDO4_VSET 0x64
	52	#define ACT8865_LDO4_CTRL 0x65
	53
	54	/*
	55	* Field Definitions.
	56	*/
	57	#define ACT8865_ENA 0x80 /* ON - [7] */
	58	#define ACT8865_VSEL_MASK 0x3F /* VSET - [5:0] */
	59
	60	/*
	61	* ACT8865 voltage number
	62	*/
	63	#define ACT8865_VOLTAGE_NUM 64
	64
	65	struct act8865 {
33036f48 WY	66	struct regmap *regmap;
	67	};
	68
	69	static const struct regmap_config act8865_regmap_config = {
	70	.reg_bits = 8,
	71	.val_bits = 8,
	72	};
	73
50a03e35	74	static const struct regulator_linear_range act8865_voltage_ranges[] = {
33036f48 WY	75	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
	76	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
	77	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
	78	};
	79
	80	static struct regulator_ops act8865_ops = {
	81	.list_voltage = regulator_list_voltage_linear_range,
	82	.map_voltage = regulator_map_voltage_linear_range,
	83	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	84	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	85	.enable = regulator_enable_regmap,
	86	.disable = regulator_disable_regmap,
	87	.is_enabled = regulator_is_enabled_regmap,
33036f48 WY	88	};
33036f48 WY	89
50a03e35 BG	90	#define ACT88xx_REG(_name, _family, _id, _vsel_reg) \
	91	[_family##_ID_##_id] = { \
	92	.name = _name, \
	93	.id = _family##_ID_##_id, \
	94	.type = REGULATOR_VOLTAGE, \
	95	.ops = &act8865_ops, \
	96	.n_voltages = ACT8865_VOLTAGE_NUM, \
	97	.linear_ranges = act8865_voltage_ranges, \
	98	.n_linear_ranges = ARRAY_SIZE(act8865_voltage_ranges), \
	99	.vsel_reg = _family##_##_id##_##_vsel_reg, \
	100	.vsel_mask = ACT8865_VSEL_MASK, \
	101	.enable_reg = _family##_##_id##_CTRL, \
	102	.enable_mask = ACT8865_ENA, \
	103	.owner = THIS_MODULE, \
	104	}
	105
	106	static const struct regulator_desc act8865_regulators[] = {
	107	ACT88xx_REG("DCDC_REG1", ACT8865, DCDC1, VSET1),
	108	ACT88xx_REG("DCDC_REG2", ACT8865, DCDC2, VSET1),
	109	ACT88xx_REG("DCDC_REG3", ACT8865, DCDC3, VSET1),
	110	ACT88xx_REG("LDO_REG1", ACT8865, LDO1, VSET),
	111	ACT88xx_REG("LDO_REG2", ACT8865, LDO2, VSET),
	112	ACT88xx_REG("LDO_REG3", ACT8865, LDO3, VSET),
	113	ACT88xx_REG("LDO_REG4", ACT8865, LDO4, VSET),
33036f48 WY	114	};
	115
	116	#ifdef CONFIG_OF
	117	static const struct of_device_id act8865_dt_ids[] = {
50a03e35	118	{ .compatible = "active-semi,act8865", .data = (void *)ACT8865 },
33036f48 WY	119	{ }
	120	};
	121	MODULE_DEVICE_TABLE(of, act8865_dt_ids);
	122
	123	static struct of_regulator_match act8865_matches[] = {
	124	[ACT8865_ID_DCDC1] = { .name = "DCDC_REG1"},
	125	[ACT8865_ID_DCDC2] = { .name = "DCDC_REG2"},
	126	[ACT8865_ID_DCDC3] = { .name = "DCDC_REG3"},
	127	[ACT8865_ID_LDO1] = { .name = "LDO_REG1"},
	128	[ACT8865_ID_LDO2] = { .name = "LDO_REG2"},
	129	[ACT8865_ID_LDO3] = { .name = "LDO_REG3"},
	130	[ACT8865_ID_LDO4] = { .name = "LDO_REG4"},
	131	};
	132
	133	static int act8865_pdata_from_dt(struct device *dev,
	134	struct device_node **of_node,
50a03e35 BG	135	struct act8865_platform_data *pdata,
	136	struct of_regulator_match *matches,
	137	int num_matches)
33036f48 WY	138	{
	139	int matched, i;
	140	struct device_node *np;
	141	struct act8865_regulator_data *regulator;
	142
6ea970a9	143	np = of_get_child_by_name(dev->of_node, "regulators");
33036f48 WY	144	if (!np) {
	145	dev_err(dev, "missing 'regulators' subnode in DT\n");
	146	return -EINVAL;
	147	}
	148
50a03e35	149	matched = of_regulator_match(dev, np, matches, num_matches);
0079eb53	150	of_node_put(np);
33036f48 WY	151	if (matched <= 0)
	152	return matched;
	153
	154	pdata->regulators = devm_kzalloc(dev,
50a03e35 BG	155	sizeof(struct act8865_regulator_data) *
50a03e35 BG	156	num_matches, GFP_KERNEL);
5ee77ef2	157	if (!pdata->regulators)
33036f48	158	return -ENOMEM;
33036f48	159
50a03e35	160	pdata->num_regulators = num_matches;
33036f48 WY	161	regulator = pdata->regulators;
33036f48 WY	162
50a03e35	163	for (i = 0; i < num_matches; i++) {
33036f48	164	regulator->id = i;
50a03e35 BG	165	regulator->name = matches[i].name;
	166	regulator->platform_data = matches[i].init_data;
	167	of_node[i] = matches[i].of_node;
33036f48 WY	168	regulator++;
	169	}
	170
	171	return 0;
	172	}
	173	#else
	174	static inline int act8865_pdata_from_dt(struct device *dev,
	175	struct device_node **of_node,
	176	struct act8865_platform_data *pdata)
	177	{
	178	return 0;
	179	}
	180	#endif
	181
48a1e1b5 BG	182	static struct regulator_init_data
	183	act8865_get_init_data(int id, struct act8865_platform_data pdata)
	184	{
	185	int i;
	186
	187	if (!pdata)
	188	return NULL;
	189
	190	for (i = 0; i < pdata->num_regulators; i++) {
	191	if (pdata->regulators[i].id == id)
	192	return pdata->regulators[i].platform_data;
	193	}
	194
	195	return NULL;
	196	}
	197
33036f48	198	static int act8865_pmic_probe(struct i2c_client *client,
50a03e35	199	const struct i2c_device_id *i2c_id)
33036f48	200	{
50a03e35 BG	201	static const struct regulator_desc *regulators;
	202	struct act8865_platform_data pdata_of, *pdata;
	203	struct of_regulator_match *matches;
33036f48	204	struct device *dev = &client->dev;
50a03e35 BG	205	struct device_node **of_node;
50a03e35 BG	206	int i, ret, num_regulators;
33036f48	207	struct act8865 *act8865;
50a03e35 BG	208	unsigned long type;
	209
	210	pdata = dev_get_platdata(dev);
33036f48 WY	211
	212	if (dev->of_node && !pdata) {
	213	const struct of_device_id *id;
33036f48 WY	214
	215	id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
	216	if (!id)
	217	return -ENODEV;
	218
50a03e35 BG	219	type = (unsigned long) id->data;
	220	} else {
	221	type = i2c_id->driver_data;
	222	}
	223
	224	switch (type) {
	225	case ACT8865:
	226	matches = act8865_matches;
	227	regulators = act8865_regulators;
	228	num_regulators = ARRAY_SIZE(act8865_regulators);
	229	break;
	230	default:
	231	dev_err(dev, "invalid device id %lu\n", type);
	232	return -EINVAL;
	233	}
	234
	235	of_node = devm_kzalloc(dev, sizeof(struct device_node )
	236	num_regulators, GFP_KERNEL);
	237	if (!of_node)
	238	return -ENOMEM;
	239
	240	if (dev->of_node && !pdata) {
	241	ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, matches,
	242	num_regulators);
33036f48 WY	243	if (ret < 0)
	244	return ret;
	245
	246	pdata = &pdata_of;
	247	}
	248
50a03e35 BG	249	if (pdata->num_regulators > num_regulators) {
	250	dev_err(dev, "too many regulators: %d\n",
	251	pdata->num_regulators);
33036f48 WY	252	return -EINVAL;
	253	}
	254
f1de2c2f	255	act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
33036f48 WY	256	if (!act8865)
	257	return -ENOMEM;
	258
33036f48 WY	259	act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
33036f48 WY	260	if (IS_ERR(act8865->regmap)) {
40d3bc19	261	ret = PTR_ERR(act8865->regmap);
33036f48	262	dev_err(&client->dev, "Failed to allocate register map: %d\n",
40d3bc19 AL	263	ret);
40d3bc19 AL	264	return ret;
33036f48 WY	265	}
	266
	267	/* Finally register devices */
50a03e35 BG	268	for (i = 0; i < num_regulators; i++) {
	269	const struct regulator_desc *desc = &regulators[i];
	270	struct regulator_config config = { };
	271	struct regulator_dev *rdev;
33036f48 WY	272
33036f48 WY	273	config.dev = dev;
48a1e1b5	274	config.init_data = act8865_get_init_data(desc->id, pdata);
33036f48 WY	275	config.of_node = of_node[i];
	276	config.driver_data = act8865;
	277	config.regmap = act8865->regmap;
	278
48a1e1b5	279	rdev = devm_regulator_register(&client->dev, desc, &config);
fb8eb454	280	if (IS_ERR(rdev)) {
48a1e1b5	281	dev_err(dev, "failed to register %s\n", desc->name);
fb8eb454	282	return PTR_ERR(rdev);
33036f48 WY	283	}
	284	}
	285
	286	i2c_set_clientdata(client, act8865);
50a03e35	287	devm_kfree(dev, of_node);
33036f48 WY	288
	289	return 0;
	290	}
	291
33036f48	292	static const struct i2c_device_id act8865_ids[] = {
50a03e35	293	{ .name = "act8865", .driver_data = ACT8865 },
33036f48 WY	294	{ },
	295	};
	296	MODULE_DEVICE_TABLE(i2c, act8865_ids);
	297
	298	static struct i2c_driver act8865_pmic_driver = {
	299	.driver = {
	300	.name = "act8865",
	301	.owner = THIS_MODULE,
	302	},
	303	.probe = act8865_pmic_probe,
33036f48 WY	304	.id_table = act8865_ids,
	305	};
	306
	307	module_i2c_driver(act8865_pmic_driver);
	308
50a03e35	309	MODULE_DESCRIPTION("active-semi act88xx voltage regulator driver");
33036f48 WY	310	MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
33036f48 WY	311	MODULE_LICENSE("GPL v2");