File: wm8994-regulator.c

package info (click to toggle)
linux 4.19.20-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 954,852 kB
  • sloc: ansic: 16,749,828; asm: 271,286; makefile: 38,257; sh: 32,808; perl: 27,671; python: 21,022; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (199 lines) | stat: -rw-r--r-- 5,086 bytes parent folder | download | duplicates (14)
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
/*
 * wm8994-regulator.c  --  Regulator driver for the WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/gpio.h>
#include <linux/slab.h>

#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/registers.h>
#include <linux/mfd/wm8994/pdata.h>

struct wm8994_ldo {
	struct regulator_dev *regulator;
	struct wm8994 *wm8994;
	struct regulator_consumer_supply supply;
	struct regulator_init_data init_data;
};

#define WM8994_LDO1_MAX_SELECTOR 0x7
#define WM8994_LDO2_MAX_SELECTOR 0x3

static const struct regulator_ops wm8994_ldo1_ops = {
	.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,
};

static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
				    unsigned int selector)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	if (selector > WM8994_LDO2_MAX_SELECTOR)
		return -EINVAL;

	switch (ldo->wm8994->type) {
	case WM8994:
		return (selector * 100000) + 900000;
	case WM8958:
		return (selector * 100000) + 1000000;
	case WM1811:
		switch (selector) {
		case 0:
			return -EINVAL;
		default:
			return (selector * 100000) + 950000;
		}
		break;
	default:
		return -EINVAL;
	}
}

static const struct regulator_ops wm8994_ldo2_ops = {
	.list_voltage = wm8994_ldo2_list_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc wm8994_ldo_desc[] = {
	{
		.name = "LDO1",
		.id = 1,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
		.vsel_reg = WM8994_LDO_1,
		.vsel_mask = WM8994_LDO1_VSEL_MASK,
		.ops = &wm8994_ldo1_ops,
		.min_uV = 2400000,
		.uV_step = 100000,
		.enable_time = 3000,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = 2,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
		.vsel_reg = WM8994_LDO_2,
		.vsel_mask = WM8994_LDO2_VSEL_MASK,
		.ops = &wm8994_ldo2_ops,
		.enable_time = 3000,
		.owner = THIS_MODULE,
	},
};

static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
	{ .supply = "AVDD1" },
	{ .supply = "DCVDD" },
};

static const struct regulator_init_data wm8994_ldo_default[] = {
	{
		.constraints = {
			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
		},
		.num_consumer_supplies = 1,
	},
	{
		.constraints = {
			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
		},
		.num_consumer_supplies = 1,
	},
};

static int wm8994_ldo_probe(struct platform_device *pdev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
	struct regulator_config config = { };
	struct wm8994_ldo *ldo;
	int ret;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
	if (!ldo)
		return -ENOMEM;

	ldo->wm8994 = wm8994;
	ldo->supply = wm8994_ldo_consumer[id];
	ldo->supply.dev_name = dev_name(wm8994->dev);

	config.dev = wm8994->dev;
	config.driver_data = ldo;
	config.regmap = wm8994->regmap;
	config.init_data = &ldo->init_data;
	if (pdata) {
		config.ena_gpio = pdata->ldo[id].enable;
	} else if (wm8994->dev->of_node) {
		config.ena_gpio = wm8994->pdata.ldo[id].enable;
		config.ena_gpio_initialized = true;
	}

	/* Use default constraints if none set up */
	if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
		dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
			ldo->supply.dev_name, ldo->supply.supply);

		ldo->init_data = wm8994_ldo_default[id];
		ldo->init_data.consumer_supplies = &ldo->supply;
		if (!config.ena_gpio)
			ldo->init_data.constraints.valid_ops_mask = 0;
	} else {
		ldo->init_data = *pdata->ldo[id].init_data;
	}

	ldo->regulator = devm_regulator_register(&pdev->dev,
						 &wm8994_ldo_desc[id],
						 &config);
	if (IS_ERR(ldo->regulator)) {
		ret = PTR_ERR(ldo->regulator);
		dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
			id + 1, ret);
		goto err;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

err:
	return ret;
}

static struct platform_driver wm8994_ldo_driver = {
	.probe = wm8994_ldo_probe,
	.driver		= {
		.name	= "wm8994-ldo",
	},
};

module_platform_driver(wm8994_ldo_driver);

/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM8994 LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-ldo");