[mirror_ubuntu-artful-kernel.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 regmap *rmap;
	struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS];
	struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
	struct regulator_dev *rdev[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 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(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(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 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_config config = { };
	int id;
	int ret;

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

	tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
	if (IS_ERR(tps->rmap)) {
		ret = PTR_ERR(tps->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) {
		tps->rdesc[id] = &tps_regs_desc[id];

		config.regmap = tps->rmap;
		config.dev = dev;
		config.driver_data = tps;

		tps->rdev[id] = devm_regulator_register(dev,
					tps->rdesc[id], &config);
		if (IS_ERR(tps->rdev[id])) {
			ret = PTR_ERR(tps->rdev[id]);
			dev_err(dev, "regulator %s register failed: %d\n",
				tps->rdesc[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;
	58	struct regmap *rmap;
	59	struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS];
	60	struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
	61	struct regulator_dev *rdev[TPS65132_MAX_REGULATORS];
	62	};
	63
	64	static int tps65132_regulator_enable(struct regulator_dev *rdev)
65	{
66	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
67	int id = rdev_get_id(rdev);
68	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
69	int ret;
70
71	if (!IS_ERR(rpdata->en_gpiod)) {
72	gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
73	rpdata->ena_gpio_state = 1;
74	}
75
76	/* Hardware automatically enable discharge bit in enable */
77	if (rdev->constraints->active_discharge ==
78	REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
79	ret = regulator_set_active_discharge_regmap(rdev, false);
80	if (ret < 0) {
81	dev_err(tps->dev, "Failed to disable active discharge: %d\n",
82	ret);
83	return ret;
84	}
85	}
86
87	return 0;
88	}
89
90	static int tps65132_regulator_disable(struct regulator_dev *rdev)
91	{
92	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
93	int id = rdev_get_id(rdev);
94	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
95
96	if (!IS_ERR(rpdata->en_gpiod)) {
97	gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
98	rpdata->ena_gpio_state = 0;
99	}
100
101	if (!IS_ERR(rpdata->act_dis_gpiod)) {
102	gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
103	usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
104	TPS65132_ACT_DIS_TIME_SLACK);
105	gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
106	}
107
108	return 0;
109	}
110
111	static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
112	{
113	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
114	int id = rdev_get_id(rdev);
115	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
116
117	if (!IS_ERR(rpdata->en_gpiod))
118	return rpdata->ena_gpio_state;
119
120	return 1;
121	}
122
123	static struct regulator_ops tps65132_regulator_ops = {
124	.enable = tps65132_regulator_enable,
125	.disable = tps65132_regulator_disable,
126	.is_enabled = tps65132_regulator_is_enabled,
127	.list_voltage = regulator_list_voltage_linear,
128	.map_voltage = regulator_map_voltage_linear,
129	.get_voltage_sel = regulator_get_voltage_sel_regmap,
130	.set_voltage_sel = regulator_set_voltage_sel_regmap,
131	.set_active_discharge = regulator_set_active_discharge_regmap,
132	};
133
134	static int tps65132_of_parse_cb(struct device_node *np,
135	const struct regulator_desc *desc,
136	struct regulator_config *config)
137	{
138	struct tps65132_regulator *tps = config->driver_data;
139	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
140	int ret;
141
142	rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
143	"enable", 0, &np->fwnode, 0, "enable");
144	if (IS_ERR(rpdata->en_gpiod)) {
145	ret = PTR_ERR(rpdata->en_gpiod);
146
147	/* Ignore the error other than probe defer */
148	if (ret == -EPROBE_DEFER)
149	return ret;
150	return 0;
151	}
152
153	rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
154	tps->dev, "active-discharge", 0,
155	&np->fwnode, 0, "active-discharge");
156	if (IS_ERR(rpdata->act_dis_gpiod)) {
157	ret = PTR_ERR(rpdata->act_dis_gpiod);
158
159	/* Ignore the error other than probe defer */
160	if (ret == -EPROBE_DEFER)
161	return ret;
162
163	return 0;
164	}
165
166	ret = of_property_read_u32(np, "ti,active-discharge-time-us",
167	&rpdata->act_dis_time_us);
168	if (ret < 0) {
169	dev_err(tps->dev, "Failed to read active discharge time:%d\n",
170	ret);
171	return ret;
172	}
173
174	return 0;
175	}
176
177	#define TPS65132_REGULATOR_DESC(_id, _name) \
178	[TPS65132_REGULATOR_ID_##_id] = { \
179	.name = "tps65132-"#_name, \
180	.supply_name = "vin", \
181	.id = TPS65132_REGULATOR_ID_##_id, \
182	.of_match = of_match_ptr(#_name), \
183	.of_parse_cb = tps65132_of_parse_cb, \
184	.ops = &tps65132_regulator_ops, \
185	.n_voltages = TPS65132_VOUT_N_VOLTAGE, \
186	.min_uV = TPS65132_VOUT_VMIN, \
187	.uV_step = TPS65132_VOUT_STEP, \
188	.enable_time = 500, \
189	.vsel_mask = TPS65132_VOUT_MASK, \
190	.vsel_reg = TPS65132_REG_##_id, \
191	.active_discharge_off = 0, \
192	.active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
193	.active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
194	.active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
195	.type = REGULATOR_VOLTAGE, \
196	.owner = THIS_MODULE, \
197	}
198
199	static struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
200	TPS65132_REGULATOR_DESC(VPOS, outp),
201	TPS65132_REGULATOR_DESC(VNEG, outn),
202	};
203
204	static const struct regmap_range tps65132_no_reg_ranges[] = {
205	regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
206	TPS65132_REG_CONTROL - 1),
207	};
208
209	static const struct regmap_access_table tps65132_no_reg_table = {
210	.no_ranges = tps65132_no_reg_ranges,
211	.n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
212	};
213
214	static const struct regmap_config tps65132_regmap_config = {
215	.reg_bits = 8,
216	.val_bits = 8,
5abca06c	217	.max_register = TPS65132_REG_CONTROL,
77c129bf VRT	218	.cache_type = REGCACHE_NONE,
	219	.rd_table = &tps65132_no_reg_table,
	220	.wr_table = &tps65132_no_reg_table,
	221	};
	222
	223	static int tps65132_probe(struct i2c_client *client,
	224	const struct i2c_device_id *client_id)
	225	{
	226	struct device *dev = &client->dev;
	227	struct tps65132_regulator *tps;
	228	struct regulator_config config = { };
	229	int id;
	230	int ret;
	231
	232	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
	233	if (!tps)
	234	return -ENOMEM;
	235
	236	tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
	237	if (IS_ERR(tps->rmap)) {
	238	ret = PTR_ERR(tps->rmap);
	239	dev_err(dev, "regmap init failed: %d\n", ret);
	240	return ret;
	241	}
	242
	243	i2c_set_clientdata(client, tps);
	244	tps->dev = dev;
	245
	246	for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
	247	tps->rdesc[id] = &tps_regs_desc[id];
	248
	249	config.regmap = tps->rmap;
	250	config.dev = dev;
	251	config.driver_data = tps;
	252
	253	tps->rdev[id] = devm_regulator_register(dev,
	254	tps->rdesc[id], &config);
	255	if (IS_ERR(tps->rdev[id])) {
	256	ret = PTR_ERR(tps->rdev[id]);
	257	dev_err(dev, "regulator %s register failed: %d\n",
	258	tps->rdesc[id]->name, ret);
	259	return ret;
	260	}
	261	}
	262	return 0;
	263	}
	264
	265	static const struct i2c_device_id tps65132_id[] = {
	266	{.name = "tps65132",},
	267	{},
	268	};
	269	MODULE_DEVICE_TABLE(i2c, tps65132_id);
	270
	271	static struct i2c_driver tps65132_i2c_driver = {
	272	.driver = {
	273	.name = "tps65132",
77c129bf VRT	274	},
	275	.probe = tps65132_probe,
	276	.id_table = tps65132_id,
	277	};
	278
	279	module_i2c_driver(tps65132_i2c_driver);
	280
	281	MODULE_DESCRIPTION("tps65132 regulator driver");
	282	MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
	283	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	284	MODULE_LICENSE("GPL v2");