aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/regulator/arizona-micsupp.c
blob: 93d0604e64b4ffe9efa388d5d828e0d00bc5ff04 (plain) (blame)
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
/*
 * arizona-micsupp.c  --  Microphone supply for Arizona devices
 *
 * Copyright 2012 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/arizona/core.h>
#include <linux/mfd/arizona/pdata.h>
#include <linux/mfd/arizona/registers.h>

#define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f

struct arizona_micsupp {
	struct regulator_dev *regulator;
	struct arizona *arizona;

	struct regulator_consumer_supply supply;
	struct regulator_init_data init_data;
};

static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
					unsigned int selector)
{
	if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
		return -EINVAL;

	if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
		return 3300000;
	else
		return (selector * 50000) + 1700000;
}

static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
				       int min_uV, int max_uV)
{
	unsigned int voltage;
	int selector;

	if (min_uV < 1700000)
		min_uV = 1700000;

	if (min_uV > 3200000)
		selector = ARIZONA_MICSUPP_MAX_SELECTOR;
	else
		selector = DIV_ROUND_UP(min_uV - 1700000, 50000);

	if (selector < 0)
		return -EINVAL;

	voltage = arizona_micsupp_list_voltage(rdev, selector);
	if (voltage < min_uV || voltage > max_uV)
		return -EINVAL;

	return selector;
}

static struct regulator_ops arizona_micsupp_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,

	.list_voltage = arizona_micsupp_list_voltage,
	.map_voltage = arizona_micsupp_map_voltage,

	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,

	.get_bypass = regulator_get_bypass_regmap,
	.set_bypass = regulator_set_bypass_regmap,
};

static const struct regulator_desc arizona_micsupp = {
	.name = "MICVDD",
	.supply_name = "CPVDD",
	.type = REGULATOR_VOLTAGE,
	.n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
	.ops = &arizona_micsupp_ops,

	.vsel_reg = ARIZONA_LDO2_CONTROL_1,
	.vsel_mask = ARIZONA_LDO2_VSEL_MASK,
	.enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
	.enable_mask = ARIZONA_CPMIC_ENA,
	.bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
	.bypass_mask = ARIZONA_CPMIC_BYPASS,

	.enable_time = 3000,

	.owner = THIS_MODULE,
};

static const struct regulator_init_data arizona_micsupp_default = {
	.constraints = {
		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
				REGULATOR_CHANGE_VOLTAGE,
		.min_uV = 1700000,
		.max_uV = 3300000,
	},

	.num_consumer_supplies = 1,
};

static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
{
	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = { };
	struct arizona_micsupp *micsupp;
	int ret;

	micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
	if (micsupp == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	micsupp->arizona = arizona;

	/*
	 * Since the chip usually supplies itself we provide some
	 * default init_data for it.  This will be overridden with
	 * platform data if provided.
	 */
	micsupp->init_data = arizona_micsupp_default;
	micsupp->init_data.consumer_supplies = &micsupp->supply;
	micsupp->supply.supply = "MICVDD";
	micsupp->supply.dev_name = dev_name(arizona->dev);

	config.dev = arizona->dev;
	config.driver_data = micsupp;
	config.regmap = arizona->regmap;

	if (arizona->pdata.micvdd)
		config.init_data = arizona->pdata.micvdd;
	else
		config.init_data = &micsupp->init_data;

	/* Default to regulated mode until the API supports bypass */
	regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
			   ARIZONA_CPMIC_BYPASS, 0);

	micsupp->regulator = regulator_register(&arizona_micsupp, &config);
	if (IS_ERR(micsupp->regulator)) {
		ret = PTR_ERR(micsupp->regulator);
		dev_err(arizona->dev, "Failed to register mic supply: %d\n",
			ret);
		return ret;
	}

	platform_set_drvdata(pdev, micsupp);

	return 0;
}

static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
{
	struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);

	regulator_unregister(micsupp->regulator);

	return 0;
}

static struct platform_driver arizona_micsupp_driver = {
	.probe = arizona_micsupp_probe,
	.remove = __devexit_p(arizona_micsupp_remove),
	.driver		= {
		.name	= "arizona-micsupp",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver(arizona_micsupp_driver);

/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("Arizona microphone supply driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:arizona-micsupp");