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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 | ||
7f217d36 | 60 | if (min_uV > 3200000) |
b667a45d MB |
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 | ||
87 | static const struct regulator_desc arizona_micsupp = { | |
88 | .name = "MICVDD", | |
89 | .supply_name = "CPVDD", | |
90 | .type = REGULATOR_VOLTAGE, | |
91 | .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1, | |
92 | .ops = &arizona_micsupp_ops, | |
93 | ||
94 | .vsel_reg = ARIZONA_LDO2_CONTROL_1, | |
95 | .vsel_mask = ARIZONA_LDO2_VSEL_MASK, | |
96 | .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1, | |
97 | .enable_mask = ARIZONA_CPMIC_ENA, | |
98 | ||
99 | .owner = THIS_MODULE, | |
100 | }; | |
101 | ||
102 | static const struct regulator_init_data arizona_micsupp_default = { | |
103 | .constraints = { | |
104 | .valid_ops_mask = REGULATOR_CHANGE_STATUS | | |
105 | REGULATOR_CHANGE_VOLTAGE, | |
106 | .min_uV = 1700000, | |
107 | .max_uV = 3300000, | |
108 | }, | |
109 | ||
110 | .num_consumer_supplies = 1, | |
111 | }; | |
112 | ||
113 | static __devinit int arizona_micsupp_probe(struct platform_device *pdev) | |
114 | { | |
115 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); | |
116 | struct regulator_config config = { }; | |
117 | struct arizona_micsupp *micsupp; | |
118 | int ret; | |
119 | ||
120 | micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL); | |
121 | if (micsupp == NULL) { | |
122 | dev_err(&pdev->dev, "Unable to allocate private data\n"); | |
123 | return -ENOMEM; | |
124 | } | |
125 | ||
126 | micsupp->arizona = arizona; | |
127 | ||
128 | /* | |
129 | * Since the chip usually supplies itself we provide some | |
130 | * default init_data for it. This will be overridden with | |
131 | * platform data if provided. | |
132 | */ | |
133 | micsupp->init_data = arizona_micsupp_default; | |
134 | micsupp->init_data.consumer_supplies = &micsupp->supply; | |
135 | micsupp->supply.supply = "MICVDD"; | |
136 | micsupp->supply.dev_name = dev_name(arizona->dev); | |
137 | ||
138 | config.dev = arizona->dev; | |
139 | config.driver_data = micsupp; | |
140 | config.regmap = arizona->regmap; | |
141 | ||
142 | if (arizona->pdata.micvdd) | |
143 | config.init_data = arizona->pdata.micvdd; | |
144 | else | |
145 | config.init_data = &micsupp->init_data; | |
146 | ||
6dc027c9 MB |
147 | /* Default to regulated mode until the API supports bypass */ |
148 | regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1, | |
149 | ARIZONA_CPMIC_BYPASS, 0); | |
150 | ||
b667a45d MB |
151 | micsupp->regulator = regulator_register(&arizona_micsupp, &config); |
152 | if (IS_ERR(micsupp->regulator)) { | |
153 | ret = PTR_ERR(micsupp->regulator); | |
154 | dev_err(arizona->dev, "Failed to register mic supply: %d\n", | |
155 | ret); | |
156 | return ret; | |
157 | } | |
158 | ||
159 | platform_set_drvdata(pdev, micsupp); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static __devexit int arizona_micsupp_remove(struct platform_device *pdev) | |
165 | { | |
166 | struct arizona_micsupp *micsupp = platform_get_drvdata(pdev); | |
167 | ||
168 | regulator_unregister(micsupp->regulator); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static struct platform_driver arizona_micsupp_driver = { | |
174 | .probe = arizona_micsupp_probe, | |
175 | .remove = __devexit_p(arizona_micsupp_remove), | |
176 | .driver = { | |
177 | .name = "arizona-micsupp", | |
178 | .owner = THIS_MODULE, | |
179 | }, | |
180 | }; | |
181 | ||
182 | module_platform_driver(arizona_micsupp_driver); | |
183 | ||
184 | /* Module information */ | |
185 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
186 | MODULE_DESCRIPTION("Arizona microphone supply driver"); | |
187 | MODULE_LICENSE("GPL"); | |
188 | MODULE_ALIAS("platform:arizona-micsupp"); |