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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> | |
e6ed9058 MB |
24 | #include <linux/workqueue.h> |
25 | #include <sound/soc.h> | |
b667a45d MB |
26 | |
27 | #include <linux/mfd/arizona/core.h> | |
28 | #include <linux/mfd/arizona/pdata.h> | |
29 | #include <linux/mfd/arizona/registers.h> | |
30 | ||
31 | #define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f | |
32 | ||
33 | struct arizona_micsupp { | |
34 | struct regulator_dev *regulator; | |
35 | struct arizona *arizona; | |
36 | ||
37 | struct regulator_consumer_supply supply; | |
38 | struct regulator_init_data init_data; | |
e6ed9058 MB |
39 | |
40 | struct work_struct check_cp_work; | |
b667a45d MB |
41 | }; |
42 | ||
43 | static int arizona_micsupp_list_voltage(struct regulator_dev *rdev, | |
44 | unsigned int selector) | |
45 | { | |
46 | if (selector > ARIZONA_MICSUPP_MAX_SELECTOR) | |
47 | return -EINVAL; | |
48 | ||
49 | if (selector == ARIZONA_MICSUPP_MAX_SELECTOR) | |
50 | return 3300000; | |
51 | else | |
52 | return (selector * 50000) + 1700000; | |
53 | } | |
54 | ||
55 | static int arizona_micsupp_map_voltage(struct regulator_dev *rdev, | |
56 | int min_uV, int max_uV) | |
57 | { | |
58 | unsigned int voltage; | |
59 | int selector; | |
60 | ||
61 | if (min_uV < 1700000) | |
62 | min_uV = 1700000; | |
63 | ||
7f217d36 | 64 | if (min_uV > 3200000) |
b667a45d MB |
65 | selector = ARIZONA_MICSUPP_MAX_SELECTOR; |
66 | else | |
67 | selector = DIV_ROUND_UP(min_uV - 1700000, 50000); | |
68 | ||
69 | if (selector < 0) | |
70 | return -EINVAL; | |
71 | ||
72 | voltage = arizona_micsupp_list_voltage(rdev, selector); | |
73 | if (voltage < min_uV || voltage > max_uV) | |
74 | return -EINVAL; | |
75 | ||
76 | return selector; | |
77 | } | |
78 | ||
e6ed9058 MB |
79 | static void arizona_micsupp_check_cp(struct work_struct *work) |
80 | { | |
81 | struct arizona_micsupp *micsupp = | |
82 | container_of(work, struct arizona_micsupp, check_cp_work); | |
83 | struct snd_soc_dapm_context *dapm = micsupp->arizona->dapm; | |
84 | struct arizona *arizona = micsupp->arizona; | |
85 | struct regmap *regmap = arizona->regmap; | |
86 | unsigned int reg; | |
87 | int ret; | |
88 | ||
89 | ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, ®); | |
90 | if (ret != 0) { | |
91 | dev_err(arizona->dev, "Failed to read CP state: %d\n", ret); | |
92 | return; | |
93 | } | |
94 | ||
95 | if (dapm) { | |
96 | if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) == | |
97 | ARIZONA_CPMIC_ENA) | |
98 | snd_soc_dapm_force_enable_pin(dapm, "MICSUPP"); | |
99 | else | |
100 | snd_soc_dapm_disable_pin(dapm, "MICSUPP"); | |
101 | ||
102 | snd_soc_dapm_sync(dapm); | |
103 | } | |
104 | } | |
105 | ||
106 | static int arizona_micsupp_enable(struct regulator_dev *rdev) | |
107 | { | |
108 | struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); | |
109 | int ret; | |
110 | ||
111 | ret = regulator_enable_regmap(rdev); | |
112 | ||
113 | if (ret == 0) | |
114 | schedule_work(&micsupp->check_cp_work); | |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
119 | static int arizona_micsupp_disable(struct regulator_dev *rdev) | |
120 | { | |
121 | struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); | |
122 | int ret; | |
123 | ||
124 | ret = regulator_disable_regmap(rdev); | |
125 | if (ret == 0) | |
126 | schedule_work(&micsupp->check_cp_work); | |
127 | ||
128 | return ret; | |
129 | } | |
130 | ||
131 | static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena) | |
132 | { | |
133 | struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev); | |
134 | int ret; | |
135 | ||
136 | ret = regulator_set_bypass_regmap(rdev, ena); | |
137 | if (ret == 0) | |
138 | schedule_work(&micsupp->check_cp_work); | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
b667a45d | 143 | static struct regulator_ops arizona_micsupp_ops = { |
e6ed9058 MB |
144 | .enable = arizona_micsupp_enable, |
145 | .disable = arizona_micsupp_disable, | |
b667a45d MB |
146 | .is_enabled = regulator_is_enabled_regmap, |
147 | ||
148 | .list_voltage = arizona_micsupp_list_voltage, | |
149 | .map_voltage = arizona_micsupp_map_voltage, | |
150 | ||
151 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
152 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
e477ce07 MB |
153 | |
154 | .get_bypass = regulator_get_bypass_regmap, | |
e6ed9058 | 155 | .set_bypass = arizona_micsupp_set_bypass, |
b667a45d MB |
156 | }; |
157 | ||
158 | static const struct regulator_desc arizona_micsupp = { | |
159 | .name = "MICVDD", | |
160 | .supply_name = "CPVDD", | |
161 | .type = REGULATOR_VOLTAGE, | |
162 | .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1, | |
163 | .ops = &arizona_micsupp_ops, | |
164 | ||
165 | .vsel_reg = ARIZONA_LDO2_CONTROL_1, | |
166 | .vsel_mask = ARIZONA_LDO2_VSEL_MASK, | |
167 | .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1, | |
168 | .enable_mask = ARIZONA_CPMIC_ENA, | |
e477ce07 MB |
169 | .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1, |
170 | .bypass_mask = ARIZONA_CPMIC_BYPASS, | |
b667a45d | 171 | |
95072818 MB |
172 | .enable_time = 3000, |
173 | ||
b667a45d MB |
174 | .owner = THIS_MODULE, |
175 | }; | |
176 | ||
177 | static const struct regulator_init_data arizona_micsupp_default = { | |
178 | .constraints = { | |
179 | .valid_ops_mask = REGULATOR_CHANGE_STATUS | | |
180 | REGULATOR_CHANGE_VOLTAGE, | |
181 | .min_uV = 1700000, | |
182 | .max_uV = 3300000, | |
183 | }, | |
184 | ||
185 | .num_consumer_supplies = 1, | |
186 | }; | |
187 | ||
a5023574 | 188 | static int arizona_micsupp_probe(struct platform_device *pdev) |
b667a45d MB |
189 | { |
190 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); | |
191 | struct regulator_config config = { }; | |
192 | struct arizona_micsupp *micsupp; | |
193 | int ret; | |
194 | ||
195 | micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL); | |
196 | if (micsupp == NULL) { | |
197 | dev_err(&pdev->dev, "Unable to allocate private data\n"); | |
198 | return -ENOMEM; | |
199 | } | |
200 | ||
201 | micsupp->arizona = arizona; | |
e6ed9058 | 202 | INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp); |
b667a45d MB |
203 | |
204 | /* | |
205 | * Since the chip usually supplies itself we provide some | |
206 | * default init_data for it. This will be overridden with | |
207 | * platform data if provided. | |
208 | */ | |
209 | micsupp->init_data = arizona_micsupp_default; | |
210 | micsupp->init_data.consumer_supplies = &micsupp->supply; | |
211 | micsupp->supply.supply = "MICVDD"; | |
212 | micsupp->supply.dev_name = dev_name(arizona->dev); | |
213 | ||
214 | config.dev = arizona->dev; | |
215 | config.driver_data = micsupp; | |
216 | config.regmap = arizona->regmap; | |
217 | ||
218 | if (arizona->pdata.micvdd) | |
219 | config.init_data = arizona->pdata.micvdd; | |
220 | else | |
221 | config.init_data = &micsupp->init_data; | |
222 | ||
6dc027c9 MB |
223 | /* Default to regulated mode until the API supports bypass */ |
224 | regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1, | |
225 | ARIZONA_CPMIC_BYPASS, 0); | |
226 | ||
b667a45d MB |
227 | micsupp->regulator = regulator_register(&arizona_micsupp, &config); |
228 | if (IS_ERR(micsupp->regulator)) { | |
229 | ret = PTR_ERR(micsupp->regulator); | |
230 | dev_err(arizona->dev, "Failed to register mic supply: %d\n", | |
231 | ret); | |
232 | return ret; | |
233 | } | |
234 | ||
235 | platform_set_drvdata(pdev, micsupp); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
8dc995f5 | 240 | static int arizona_micsupp_remove(struct platform_device *pdev) |
b667a45d MB |
241 | { |
242 | struct arizona_micsupp *micsupp = platform_get_drvdata(pdev); | |
243 | ||
244 | regulator_unregister(micsupp->regulator); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static struct platform_driver arizona_micsupp_driver = { | |
250 | .probe = arizona_micsupp_probe, | |
5eb9f2b9 | 251 | .remove = arizona_micsupp_remove, |
b667a45d MB |
252 | .driver = { |
253 | .name = "arizona-micsupp", | |
254 | .owner = THIS_MODULE, | |
255 | }, | |
256 | }; | |
257 | ||
258 | module_platform_driver(arizona_micsupp_driver); | |
259 | ||
260 | /* Module information */ | |
261 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
262 | MODULE_DESCRIPTION("Arizona microphone supply driver"); | |
263 | MODULE_LICENSE("GPL"); | |
264 | MODULE_ALIAS("platform:arizona-micsupp"); |