Merge remote-tracking branch 'regulator/topic/change' into regulator-next
[linux-3.10.git] / drivers / regulator / arizona-micsupp.c
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         .enable_time = 3000,
105
106         .owner = THIS_MODULE,
107 };
108
109 static const struct regulator_init_data arizona_micsupp_default = {
110         .constraints = {
111                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
112                                 REGULATOR_CHANGE_VOLTAGE,
113                 .min_uV = 1700000,
114                 .max_uV = 3300000,
115         },
116
117         .num_consumer_supplies = 1,
118 };
119
120 static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
121 {
122         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
123         struct regulator_config config = { };
124         struct arizona_micsupp *micsupp;
125         int ret;
126
127         micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
128         if (micsupp == NULL) {
129                 dev_err(&pdev->dev, "Unable to allocate private data\n");
130                 return -ENOMEM;
131         }
132
133         micsupp->arizona = arizona;
134
135         /*
136          * Since the chip usually supplies itself we provide some
137          * default init_data for it.  This will be overridden with
138          * platform data if provided.
139          */
140         micsupp->init_data = arizona_micsupp_default;
141         micsupp->init_data.consumer_supplies = &micsupp->supply;
142         micsupp->supply.supply = "MICVDD";
143         micsupp->supply.dev_name = dev_name(arizona->dev);
144
145         config.dev = arizona->dev;
146         config.driver_data = micsupp;
147         config.regmap = arizona->regmap;
148
149         if (arizona->pdata.micvdd)
150                 config.init_data = arizona->pdata.micvdd;
151         else
152                 config.init_data = &micsupp->init_data;
153
154         /* Default to regulated mode until the API supports bypass */
155         regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
156                            ARIZONA_CPMIC_BYPASS, 0);
157
158         micsupp->regulator = regulator_register(&arizona_micsupp, &config);
159         if (IS_ERR(micsupp->regulator)) {
160                 ret = PTR_ERR(micsupp->regulator);
161                 dev_err(arizona->dev, "Failed to register mic supply: %d\n",
162                         ret);
163                 return ret;
164         }
165
166         platform_set_drvdata(pdev, micsupp);
167
168         return 0;
169 }
170
171 static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
172 {
173         struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
174
175         regulator_unregister(micsupp->regulator);
176
177         return 0;
178 }
179
180 static struct platform_driver arizona_micsupp_driver = {
181         .probe = arizona_micsupp_probe,
182         .remove = __devexit_p(arizona_micsupp_remove),
183         .driver         = {
184                 .name   = "arizona-micsupp",
185                 .owner  = THIS_MODULE,
186         },
187 };
188
189 module_platform_driver(arizona_micsupp_driver);
190
191 /* Module information */
192 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
193 MODULE_DESCRIPTION("Arizona microphone supply driver");
194 MODULE_LICENSE("GPL");
195 MODULE_ALIAS("platform:arizona-micsupp");