aboutsummaryrefslogtreecommitdiff
path: root/drivers/regulator/as3711-regulator.c
blob: c0e93b1332f7b87f577b46c4a4fe1c93af12b152 (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
285
286
287
288
289
/*
 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the version 2 of the GNU General Public License as
 * published by the Free Software Foundation
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/as3711.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>

struct as3711_regulator_info {
	struct regulator_desc	desc;
};

struct as3711_regulator {
	struct as3711_regulator_info *reg_info;
};

/*
 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 * FAST:	sdX_fast=1
 * NORMAL:	low_noise=1
 * IDLE:	low_noise=0
 */

static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
{
	unsigned int fast_bit = rdev->desc->enable_mask,
		low_noise_bit = fast_bit << 4;
	u8 val;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = fast_bit | low_noise_bit;
		break;
	case REGULATOR_MODE_NORMAL:
		val = low_noise_bit;
		break;
	case REGULATOR_MODE_IDLE:
		val = 0;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
				  low_noise_bit | fast_bit, val);
}

static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
{
	unsigned int fast_bit = rdev->desc->enable_mask,
		low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
	unsigned int val;
	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);

	if (ret < 0)
		return ret;

	if ((val & mask) == mask)
		return REGULATOR_MODE_FAST;

	if ((val & mask) == low_noise_bit)
		return REGULATOR_MODE_NORMAL;

	if (!(val & mask))
		return REGULATOR_MODE_IDLE;

	return -EINVAL;
}

static struct regulator_ops as3711_sd_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
	.get_mode		= as3711_get_mode_sd,
	.set_mode		= as3711_set_mode_sd,
};

static struct regulator_ops as3711_aldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
};

static struct regulator_ops as3711_dldo_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
};

static const struct regulator_linear_range as3711_sd_ranges[] = {
	REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
	REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
	REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
};

static const struct regulator_linear_range as3711_aldo_ranges[] = {
	REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
	REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
};

static const struct regulator_linear_range as3711_dldo_ranges[] = {
	REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
	REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
};

#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)			   \
	[AS3711_REGULATOR_ ## _id] = {					   \
	.desc = {							   \
		.name = "as3711-regulator-" # _id,			   \
		.id = AS3711_REGULATOR_ ## _id,				   \
		.n_voltages = (_vmask + 1),				   \
		.ops = &as3711_ ## _sfx ## _ops,			   \
		.type = REGULATOR_VOLTAGE,				   \
		.owner = THIS_MODULE,					   \
		.vsel_reg = AS3711_ ## _id ## _VOLTAGE,			   \
		.vsel_mask = _vmask,					   \
		.enable_reg = AS3711_ ## _en_reg,			   \
		.enable_mask = BIT(_en_bit),				   \
		.linear_ranges = as3711_ ## _sfx ## _ranges,		   \
		.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
	},								   \
}

static struct as3711_regulator_info as3711_reg_info[] = {
	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
	/* StepUp output voltage depends on supplying regulator */
};

#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)

static struct of_regulator_match
as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
	[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
	[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
	[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
	[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
	[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
	[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
	[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
	[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
	[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
	[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
	[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
	[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
};

static int as3711_regulator_parse_dt(struct device *dev,
				struct device_node **of_node, const int count)
{
	struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
	struct device_node *regulators =
		of_get_child_by_name(dev->parent->of_node, "regulators");
	struct of_regulator_match *match;
	int ret, i;

	if (!regulators) {
		dev_err(dev, "regulator node not found\n");
		return -ENODEV;
	}

	ret = of_regulator_match(dev->parent, regulators,
				 as3711_regulator_matches, count);
	of_node_put(regulators);
	if (ret < 0) {
		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
		return ret;
	}

	for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
		if (match->of_node) {
			pdata->init_data[i] = match->init_data;
			of_node[i] = match->of_node;
		}

	return 0;
}

static int as3711_regulator_probe(struct platform_device *pdev)
{
	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = {.dev = &pdev->dev,};
	struct as3711_regulator *reg = NULL;
	struct as3711_regulator *regs;
	struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
	struct regulator_dev *rdev;
	struct as3711_regulator_info *ri;
	int ret;
	int id;

	if (!pdata) {
		dev_err(&pdev->dev, "No platform data...\n");
		return -ENODEV;
	}

	if (pdev->dev.parent->of_node) {
		ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
		if (ret < 0) {
			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
			return ret;
		}
	}

	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
			sizeof(struct as3711_regulator), GFP_KERNEL);
	if (!regs)
		return -ENOMEM;

	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
		reg = &regs[id];
		reg->reg_info = ri;

		config.init_data = pdata->init_data[id];
		config.driver_data = reg;
		config.regmap = as3711->regmap;
		config.of_node = of_node[id];

		rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "Failed to register regulator %s\n",
				ri->desc.name);
			return PTR_ERR(rdev);
		}
	}
	platform_set_drvdata(pdev, regs);
	return 0;
}

static struct platform_driver as3711_regulator_driver = {
	.driver	= {
		.name	= "as3711-regulator",
	},
	.probe		= as3711_regulator_probe,
};

static int __init as3711_regulator_init(void)
{
	return platform_driver_register(&as3711_regulator_driver);
}
subsys_initcall(as3711_regulator_init);

static void __exit as3711_regulator_exit(void)
{
	platform_driver_unregister(&as3711_regulator_driver);
}
module_exit(as3711_regulator_exit);

MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("AS3711 regulator driver");
MODULE_ALIAS("platform:as3711-regulator");
MODULE_LICENSE("GPL v2");