xref: /linux/drivers/regulator/arizona-micsupp.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /*
2  * arizona-micsupp.c  --  Microphone supply for Arizona devices
3  *
4  * Copyright 2012 Wolfson Microelectronics PLC.
5  *
6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7  *
8  *  This program is free software; you can redistribute  it and/or modify it
9  *  under  the terms of  the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the  License, or (at your
11  *  option) any later version.
12  */
13 
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/bitops.h>
18 #include <linux/err.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22 #include <linux/gpio.h>
23 #include <linux/slab.h>
24 
25 #include <linux/mfd/arizona/core.h>
26 #include <linux/mfd/arizona/pdata.h>
27 #include <linux/mfd/arizona/registers.h>
28 
29 #define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f
30 
31 struct arizona_micsupp {
32 	struct regulator_dev *regulator;
33 	struct arizona *arizona;
34 
35 	struct regulator_consumer_supply supply;
36 	struct regulator_init_data init_data;
37 };
38 
39 static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
40 					unsigned int selector)
41 {
42 	if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
43 		return -EINVAL;
44 
45 	if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
46 		return 3300000;
47 	else
48 		return (selector * 50000) + 1700000;
49 }
50 
51 static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
52 				       int min_uV, int max_uV)
53 {
54 	unsigned int voltage;
55 	int selector;
56 
57 	if (min_uV < 1700000)
58 		min_uV = 1700000;
59 
60 	if (min_uV > 3200000)
61 		selector = ARIZONA_MICSUPP_MAX_SELECTOR;
62 	else
63 		selector = DIV_ROUND_UP(min_uV - 1700000, 50000);
64 
65 	if (selector < 0)
66 		return -EINVAL;
67 
68 	voltage = arizona_micsupp_list_voltage(rdev, selector);
69 	if (voltage < min_uV || voltage > max_uV)
70 		return -EINVAL;
71 
72 	return selector;
73 }
74 
75 static struct regulator_ops arizona_micsupp_ops = {
76 	.enable = regulator_enable_regmap,
77 	.disable = regulator_disable_regmap,
78 	.is_enabled = regulator_is_enabled_regmap,
79 
80 	.list_voltage = arizona_micsupp_list_voltage,
81 	.map_voltage = arizona_micsupp_map_voltage,
82 
83 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
84 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
85 
86 	.get_bypass = regulator_get_bypass_regmap,
87 	.set_bypass = regulator_set_bypass_regmap,
88 };
89 
90 static const struct regulator_desc arizona_micsupp = {
91 	.name = "MICVDD",
92 	.supply_name = "CPVDD",
93 	.type = REGULATOR_VOLTAGE,
94 	.n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
95 	.ops = &arizona_micsupp_ops,
96 
97 	.vsel_reg = ARIZONA_LDO2_CONTROL_1,
98 	.vsel_mask = ARIZONA_LDO2_VSEL_MASK,
99 	.enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
100 	.enable_mask = ARIZONA_CPMIC_ENA,
101 	.bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
102 	.bypass_mask = ARIZONA_CPMIC_BYPASS,
103 
104 	.owner = THIS_MODULE,
105 };
106 
107 static const struct regulator_init_data arizona_micsupp_default = {
108 	.constraints = {
109 		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
110 				REGULATOR_CHANGE_VOLTAGE,
111 		.min_uV = 1700000,
112 		.max_uV = 3300000,
113 	},
114 
115 	.num_consumer_supplies = 1,
116 };
117 
118 static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
119 {
120 	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
121 	struct regulator_config config = { };
122 	struct arizona_micsupp *micsupp;
123 	int ret;
124 
125 	micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
126 	if (micsupp == NULL) {
127 		dev_err(&pdev->dev, "Unable to allocate private data\n");
128 		return -ENOMEM;
129 	}
130 
131 	micsupp->arizona = arizona;
132 
133 	/*
134 	 * Since the chip usually supplies itself we provide some
135 	 * default init_data for it.  This will be overridden with
136 	 * platform data if provided.
137 	 */
138 	micsupp->init_data = arizona_micsupp_default;
139 	micsupp->init_data.consumer_supplies = &micsupp->supply;
140 	micsupp->supply.supply = "MICVDD";
141 	micsupp->supply.dev_name = dev_name(arizona->dev);
142 
143 	config.dev = arizona->dev;
144 	config.driver_data = micsupp;
145 	config.regmap = arizona->regmap;
146 
147 	if (arizona->pdata.micvdd)
148 		config.init_data = arizona->pdata.micvdd;
149 	else
150 		config.init_data = &micsupp->init_data;
151 
152 	/* Default to regulated mode until the API supports bypass */
153 	regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
154 			   ARIZONA_CPMIC_BYPASS, 0);
155 
156 	micsupp->regulator = regulator_register(&arizona_micsupp, &config);
157 	if (IS_ERR(micsupp->regulator)) {
158 		ret = PTR_ERR(micsupp->regulator);
159 		dev_err(arizona->dev, "Failed to register mic supply: %d\n",
160 			ret);
161 		return ret;
162 	}
163 
164 	platform_set_drvdata(pdev, micsupp);
165 
166 	return 0;
167 }
168 
169 static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
170 {
171 	struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
172 
173 	regulator_unregister(micsupp->regulator);
174 
175 	return 0;
176 }
177 
178 static struct platform_driver arizona_micsupp_driver = {
179 	.probe = arizona_micsupp_probe,
180 	.remove = __devexit_p(arizona_micsupp_remove),
181 	.driver		= {
182 		.name	= "arizona-micsupp",
183 		.owner	= THIS_MODULE,
184 	},
185 };
186 
187 module_platform_driver(arizona_micsupp_driver);
188 
189 /* Module information */
190 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
191 MODULE_DESCRIPTION("Arizona microphone supply driver");
192 MODULE_LICENSE("GPL");
193 MODULE_ALIAS("platform:arizona-micsupp");
194