[linux-2.6-block.git] / drivers / regulator / tps65132-regulator.c

/*
 * TI TPS65132 Regulator driver
 *
 * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
 *
 * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
 *		Laxman Dewangan <ldewangan@nvidia.com>
 *
 * 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 "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>

#define TPS65132_REG_VPOS		0x00
#define TPS65132_REG_VNEG		0x01
#define TPS65132_REG_APPS_DISP_DISN	0x03
#define TPS65132_REG_CONTROL		0x0FF

#define TPS65132_VOUT_MASK		0x1F
#define TPS65132_VOUT_N_VOLTAGE		0x15
#define TPS65132_VOUT_VMIN		4000000
#define TPS65132_VOUT_VMAX		6000000
#define TPS65132_VOUT_STEP		100000

#define TPS65132_REG_APPS_DIS_VPOS		BIT(0)
#define TPS65132_REG_APPS_DIS_VNEG		BIT(1)

#define TPS65132_REGULATOR_ID_VPOS	0
#define TPS65132_REGULATOR_ID_VNEG	1
#define TPS65132_MAX_REGULATORS		2

#define TPS65132_ACT_DIS_TIME_SLACK		1000

struct tps65132_reg_pdata {
	struct gpio_desc *en_gpiod;
	struct gpio_desc *act_dis_gpiod;
	unsigned int act_dis_time_us;
	int ena_gpio_state;
};

struct tps65132_regulator {
	struct device *dev;
	struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
};

static int tps65132_regulator_enable(struct regulator_dev *rdev)
{
	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
	int ret;

	if (!IS_ERR(rpdata->en_gpiod)) {
		gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
		rpdata->ena_gpio_state = 1;
	}

	/* Hardware automatically enable discharge bit in enable */
	if (rdev->constraints->active_discharge ==
			REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
		ret = regulator_set_active_discharge_regmap(rdev, false);
		if (ret < 0) {
			dev_err(tps->dev, "Failed to disable active discharge: %d\n",
				ret);
			return ret;
		}
	}

	return 0;
}

static int tps65132_regulator_disable(struct regulator_dev *rdev)
{
	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];

	if (!IS_ERR(rpdata->en_gpiod)) {
		gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
		rpdata->ena_gpio_state = 0;
	}

	if (!IS_ERR(rpdata->act_dis_gpiod)) {
		gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
		usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
			     TPS65132_ACT_DIS_TIME_SLACK);
		gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
	}

	return 0;
}

static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];

	if (!IS_ERR(rpdata->en_gpiod))
		return rpdata->ena_gpio_state;

	return 1;
}

static const struct regulator_ops tps65132_regulator_ops = {
	.enable = tps65132_regulator_enable,
	.disable = tps65132_regulator_disable,
	.is_enabled = tps65132_regulator_is_enabled,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
};

static int tps65132_of_parse_cb(struct device_node *np,
				const struct regulator_desc *desc,
				struct regulator_config *config)
{
	struct tps65132_regulator *tps = config->driver_data;
	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
	int ret;

	rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
					"enable", 0, &np->fwnode, 0, "enable");
	if (IS_ERR_OR_NULL(rpdata->en_gpiod)) {
		ret = PTR_ERR(rpdata->en_gpiod);

		/* Ignore the error other than probe defer */
		if (ret == -EPROBE_DEFER)
			return ret;
		return 0;
	}

	rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
					tps->dev, "active-discharge", 0,
					&np->fwnode, 0, "active-discharge");
	if (IS_ERR_OR_NULL(rpdata->act_dis_gpiod)) {
		ret = PTR_ERR(rpdata->act_dis_gpiod);

		/* Ignore the error other than probe defer */
		if (ret == -EPROBE_DEFER)
			return ret;

		return 0;
	}

	ret = of_property_read_u32(np, "ti,active-discharge-time-us",
				   &rpdata->act_dis_time_us);
	if (ret < 0) {
		dev_err(tps->dev, "Failed to read active discharge time:%d\n",
			ret);
		return ret;
	}

	return 0;
}

#define TPS65132_REGULATOR_DESC(_id, _name)		\
	[TPS65132_REGULATOR_ID_##_id] = {		\
		.name = "tps65132-"#_name,		\
		.supply_name = "vin",			\
		.id = TPS65132_REGULATOR_ID_##_id,	\
		.of_match = of_match_ptr(#_name),	\
		.of_parse_cb	= tps65132_of_parse_cb,	\
		.ops = &tps65132_regulator_ops,		\
		.n_voltages = TPS65132_VOUT_N_VOLTAGE,	\
		.min_uV = TPS65132_VOUT_VMIN,		\
		.uV_step = TPS65132_VOUT_STEP,		\
		.enable_time = 500,			\
		.vsel_mask = TPS65132_VOUT_MASK,	\
		.vsel_reg = TPS65132_REG_##_id,		\
		.active_discharge_off = 0,			\
		.active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
		.active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
		.active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
		.type = REGULATOR_VOLTAGE,		\
		.owner = THIS_MODULE,			\
	}

static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
	TPS65132_REGULATOR_DESC(VPOS, outp),
	TPS65132_REGULATOR_DESC(VNEG, outn),
};

static const struct regmap_range tps65132_no_reg_ranges[] = {
	regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
			 TPS65132_REG_CONTROL - 1),
};

static const struct regmap_access_table tps65132_no_reg_table = {
	.no_ranges = tps65132_no_reg_ranges,
	.n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
};

static const struct regmap_config tps65132_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= TPS65132_REG_CONTROL,
	.cache_type	= REGCACHE_NONE,
	.rd_table	= &tps65132_no_reg_table,
	.wr_table	= &tps65132_no_reg_table,
};

static int tps65132_probe(struct i2c_client *client,
			  const struct i2c_device_id *client_id)
{
	struct device *dev = &client->dev;
	struct tps65132_regulator *tps;
	struct regulator_dev *rdev;
	struct regmap *rmap;
	struct regulator_config config = { };
	int id;
	int ret;

	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
	if (!tps)
		return -ENOMEM;

	rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
	if (IS_ERR(rmap)) {
		ret = PTR_ERR(rmap);
		dev_err(dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	i2c_set_clientdata(client, tps);
	tps->dev = dev;

	for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
		config.regmap = rmap;
		config.dev = dev;
		config.driver_data = tps;

		rdev = devm_regulator_register(dev, &tps_regs_desc[id],
					       &config);
		if (IS_ERR(rdev)) {
			ret = PTR_ERR(rdev);
			dev_err(dev, "regulator %s register failed: %d\n",
				tps_regs_desc[id].name, ret);
			return ret;
		}
	}
	return 0;
}

static const struct i2c_device_id tps65132_id[] = {
	{.name = "tps65132",},
	{},
};
MODULE_DEVICE_TABLE(i2c, tps65132_id);

static struct i2c_driver tps65132_i2c_driver = {
	.driver = {
		.name = "tps65132",
	},
	.probe = tps65132_probe,
	.id_table = tps65132_id,
};

module_i2c_driver(tps65132_i2c_driver);

MODULE_DESCRIPTION("tps65132 regulator driver");
MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
77c129bf VRT	1	/*
	2	* TI TPS65132 Regulator driver
	3	*
	4	* Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
	5	*
	6	* Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
	7	* Laxman Dewangan <ldewangan@nvidia.com>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License as
	11	* published by the Free Software Foundation; either version 2 of the
	12	* License, or (at your option) any later version.
	13	*
	14	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	15	* whether express or implied; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*/
	19
	20	#include <linux/delay.h>
	21	#include <linux/err.h>
	22	#include <linux/gpio/consumer.h>
	23	#include <linux/i2c.h>
	24	#include <linux/module.h>
	25	#include <linux/regmap.h>
	26	#include <linux/regulator/driver.h>
	27	#include <linux/regulator/machine.h>
	28
	29	#define TPS65132_REG_VPOS 0x00
	30	#define TPS65132_REG_VNEG 0x01
	31	#define TPS65132_REG_APPS_DISP_DISN 0x03
	32	#define TPS65132_REG_CONTROL 0x0FF
	33
	34	#define TPS65132_VOUT_MASK 0x1F
	35	#define TPS65132_VOUT_N_VOLTAGE 0x15
	36	#define TPS65132_VOUT_VMIN 4000000
	37	#define TPS65132_VOUT_VMAX 6000000
	38	#define TPS65132_VOUT_STEP 100000
	39
	40	#define TPS65132_REG_APPS_DIS_VPOS BIT(0)
	41	#define TPS65132_REG_APPS_DIS_VNEG BIT(1)
	42
	43	#define TPS65132_REGULATOR_ID_VPOS 0
	44	#define TPS65132_REGULATOR_ID_VNEG 1
	45	#define TPS65132_MAX_REGULATORS 2
	46
	47	#define TPS65132_ACT_DIS_TIME_SLACK 1000
	48
	49	struct tps65132_reg_pdata {
	50	struct gpio_desc *en_gpiod;
	51	struct gpio_desc *act_dis_gpiod;
	52	unsigned int act_dis_time_us;
	53	int ena_gpio_state;
	54	};
	55
	56	struct tps65132_regulator {
	57	struct device *dev;
77c129bf	58	struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
77c129bf VRT	59	};
	60
	61	static int tps65132_regulator_enable(struct regulator_dev *rdev)
	62	{
	63	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
	64	int id = rdev_get_id(rdev);
	65	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
	66	int ret;
	67
	68	if (!IS_ERR(rpdata->en_gpiod)) {
	69	gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
	70	rpdata->ena_gpio_state = 1;
	71	}
	72
	73	/* Hardware automatically enable discharge bit in enable */
	74	if (rdev->constraints->active_discharge ==
	75	REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
	76	ret = regulator_set_active_discharge_regmap(rdev, false);
	77	if (ret < 0) {
	78	dev_err(tps->dev, "Failed to disable active discharge: %d\n",
	79	ret);
	80	return ret;
	81	}
	82	}
	83
	84	return 0;
	85	}
	86
	87	static int tps65132_regulator_disable(struct regulator_dev *rdev)
	88	{
	89	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
	90	int id = rdev_get_id(rdev);
	91	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
	92
	93	if (!IS_ERR(rpdata->en_gpiod)) {
	94	gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
	95	rpdata->ena_gpio_state = 0;
	96	}
	97
	98	if (!IS_ERR(rpdata->act_dis_gpiod)) {
	99	gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
	100	usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
	101	TPS65132_ACT_DIS_TIME_SLACK);
	102	gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
	103	}
	104
	105	return 0;
	106	}
	107
	108	static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
	109	{
	110	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
	111	int id = rdev_get_id(rdev);
	112	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
	113
	114	if (!IS_ERR(rpdata->en_gpiod))
	115	return rpdata->ena_gpio_state;
	116
	117	return 1;
	118	}
	119
4e105e3b	120	static const struct regulator_ops tps65132_regulator_ops = {
77c129bf VRT	121	.enable = tps65132_regulator_enable,
	122	.disable = tps65132_regulator_disable,
	123	.is_enabled = tps65132_regulator_is_enabled,
	124	.list_voltage = regulator_list_voltage_linear,
	125	.map_voltage = regulator_map_voltage_linear,
	126	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	127	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	128	.set_active_discharge = regulator_set_active_discharge_regmap,
	129	};
	130
	131	static int tps65132_of_parse_cb(struct device_node *np,
	132	const struct regulator_desc *desc,
	133	struct regulator_config *config)
	134	{
	135	struct tps65132_regulator *tps = config->driver_data;
	136	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
	137	int ret;
	138
	139	rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
	140	"enable", 0, &np->fwnode, 0, "enable");
a9574467	141	if (IS_ERR_OR_NULL(rpdata->en_gpiod)) {
77c129bf VRT	142	ret = PTR_ERR(rpdata->en_gpiod);
	143
	144	/* Ignore the error other than probe defer */
	145	if (ret == -EPROBE_DEFER)
	146	return ret;
	147	return 0;
	148	}
	149
	150	rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
	151	tps->dev, "active-discharge", 0,
	152	&np->fwnode, 0, "active-discharge");
a9574467	153	if (IS_ERR_OR_NULL(rpdata->act_dis_gpiod)) {
77c129bf VRT	154	ret = PTR_ERR(rpdata->act_dis_gpiod);
	155
	156	/* Ignore the error other than probe defer */
	157	if (ret == -EPROBE_DEFER)
	158	return ret;
	159
	160	return 0;
	161	}
	162
	163	ret = of_property_read_u32(np, "ti,active-discharge-time-us",
	164	&rpdata->act_dis_time_us);
	165	if (ret < 0) {
	166	dev_err(tps->dev, "Failed to read active discharge time:%d\n",
	167	ret);
	168	return ret;
	169	}
	170
	171	return 0;
	172	}
	173
	174	#define TPS65132_REGULATOR_DESC(_id, _name) \
	175	[TPS65132_REGULATOR_ID_##_id] = { \
	176	.name = "tps65132-"#_name, \
	177	.supply_name = "vin", \
	178	.id = TPS65132_REGULATOR_ID_##_id, \
	179	.of_match = of_match_ptr(#_name), \
	180	.of_parse_cb = tps65132_of_parse_cb, \
	181	.ops = &tps65132_regulator_ops, \
	182	.n_voltages = TPS65132_VOUT_N_VOLTAGE, \
	183	.min_uV = TPS65132_VOUT_VMIN, \
	184	.uV_step = TPS65132_VOUT_STEP, \
	185	.enable_time = 500, \
	186	.vsel_mask = TPS65132_VOUT_MASK, \
	187	.vsel_reg = TPS65132_REG_##_id, \
	188	.active_discharge_off = 0, \
	189	.active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
	190	.active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
	191	.active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
	192	.type = REGULATOR_VOLTAGE, \
	193	.owner = THIS_MODULE, \
	194	}
	195
4e105e3b	196	static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
77c129bf VRT	197	TPS65132_REGULATOR_DESC(VPOS, outp),
	198	TPS65132_REGULATOR_DESC(VNEG, outn),
	199	};
	200
	201	static const struct regmap_range tps65132_no_reg_ranges[] = {
	202	regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
	203	TPS65132_REG_CONTROL - 1),
	204	};
	205
	206	static const struct regmap_access_table tps65132_no_reg_table = {
	207	.no_ranges = tps65132_no_reg_ranges,
	208	.n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
	209	};
	210
	211	static const struct regmap_config tps65132_regmap_config = {
	212	.reg_bits = 8,
	213	.val_bits = 8,
5abca06c	214	.max_register = TPS65132_REG_CONTROL,
77c129bf VRT	215	.cache_type = REGCACHE_NONE,
	216	.rd_table = &tps65132_no_reg_table,
	217	.wr_table = &tps65132_no_reg_table,
	218	};
	219
	220	static int tps65132_probe(struct i2c_client *client,
	221	const struct i2c_device_id *client_id)
	222	{
	223	struct device *dev = &client->dev;
	224	struct tps65132_regulator *tps;
2e62e033 AL	225	struct regulator_dev *rdev;
2e62e033 AL	226	struct regmap *rmap;
77c129bf VRT	227	struct regulator_config config = { };
	228	int id;
	229	int ret;
	230
	231	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
	232	if (!tps)
	233	return -ENOMEM;
	234
2e62e033 AL	235	rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
	236	if (IS_ERR(rmap)) {
	237	ret = PTR_ERR(rmap);
77c129bf VRT	238	dev_err(dev, "regmap init failed: %d\n", ret);
	239	return ret;
	240	}
	241
	242	i2c_set_clientdata(client, tps);
	243	tps->dev = dev;
	244
	245	for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
2e62e033	246	config.regmap = rmap;
77c129bf VRT	247	config.dev = dev;
	248	config.driver_data = tps;
	249
2e62e033 AL	250	rdev = devm_regulator_register(dev, &tps_regs_desc[id],
	251	&config);
	252	if (IS_ERR(rdev)) {
	253	ret = PTR_ERR(rdev);
77c129bf	254	dev_err(dev, "regulator %s register failed: %d\n",
2e62e033	255	tps_regs_desc[id].name, ret);
77c129bf VRT	256	return ret;
	257	}
	258	}
	259	return 0;
	260	}
	261
	262	static const struct i2c_device_id tps65132_id[] = {
	263	{.name = "tps65132",},
	264	{},
	265	};
	266	MODULE_DEVICE_TABLE(i2c, tps65132_id);
	267
	268	static struct i2c_driver tps65132_i2c_driver = {
	269	.driver = {
	270	.name = "tps65132",
77c129bf VRT	271	},
	272	.probe = tps65132_probe,
	273	.id_table = tps65132_id,
	274	};
	275
	276	module_i2c_driver(tps65132_i2c_driver);
	277
	278	MODULE_DESCRIPTION("tps65132 regulator driver");
	279	MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
	280	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	281	MODULE_LICENSE("GPL v2");