summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/tps65132-regulator.c
blob: a06f5f2d79329d615807fcc51064705accfdcc63 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/*
 * 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_gpiod_get(tps->dev, of_fwnode_handle(np),
						 "enable", GPIOD_ASIS,
						 "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_gpiod_get(tps->dev,
						      of_fwnode_handle(np),
						      "active-discharge",
						      GPIOD_ASIS,
						      "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 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)
{
	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_type = PROBE_PREFER_ASYNCHRONOUS,
	},
	.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");