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/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
23 #include <linux/regulator/of_regulator.h>
24 #include <linux/gpio.h>
25 #include <linux/slab.h>
26 #include <linux/workqueue.h>
27 #include <sound/soc.h>
28
29 #include <linux/mfd/arizona/core.h>
30 #include <linux/mfd/arizona/pdata.h>
31 #include <linux/mfd/arizona/registers.h>
32
33 #include <linux/regulator/arizona-micsupp.h>
34
35 struct arizona_micsupp {
36 struct regulator_dev *regulator;
37 struct regmap *regmap;
38 struct snd_soc_dapm_context **dapm;
39 unsigned int enable_reg;
40 struct device *dev;
41
42 struct regulator_consumer_supply supply;
43 struct regulator_init_data init_data;
44
45 struct work_struct check_cp_work;
46 };
47
arizona_micsupp_check_cp(struct work_struct * work)48 static void arizona_micsupp_check_cp(struct work_struct *work)
49 {
50 struct arizona_micsupp *micsupp =
51 container_of(work, struct arizona_micsupp, check_cp_work);
52 struct snd_soc_dapm_context *dapm = *micsupp->dapm;
53 struct snd_soc_component *component;
54 unsigned int val;
55 int ret;
56
57 ret = regmap_read(micsupp->regmap, micsupp->enable_reg, &val);
58 if (ret != 0) {
59 dev_err(micsupp->dev,
60 "Failed to read CP state: %d\n", ret);
61 return;
62 }
63
64 if (dapm) {
65 component = snd_soc_dapm_to_component(dapm);
66
67 if ((val & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) ==
68 ARIZONA_CPMIC_ENA)
69 snd_soc_component_force_enable_pin(component,
70 "MICSUPP");
71 else
72 snd_soc_component_disable_pin(component, "MICSUPP");
73
74 snd_soc_dapm_sync(dapm);
75 }
76 }
77
arizona_micsupp_enable(struct regulator_dev * rdev)78 static int arizona_micsupp_enable(struct regulator_dev *rdev)
79 {
80 struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
81 int ret;
82
83 ret = regulator_enable_regmap(rdev);
84
85 if (ret == 0)
86 schedule_work(&micsupp->check_cp_work);
87
88 return ret;
89 }
90
arizona_micsupp_disable(struct regulator_dev * rdev)91 static int arizona_micsupp_disable(struct regulator_dev *rdev)
92 {
93 struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
94 int ret;
95
96 ret = regulator_disable_regmap(rdev);
97 if (ret == 0)
98 schedule_work(&micsupp->check_cp_work);
99
100 return ret;
101 }
102
arizona_micsupp_set_bypass(struct regulator_dev * rdev,bool ena)103 static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena)
104 {
105 struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
106 int ret;
107
108 ret = regulator_set_bypass_regmap(rdev, ena);
109 if (ret == 0)
110 schedule_work(&micsupp->check_cp_work);
111
112 return ret;
113 }
114
115 static const struct regulator_ops arizona_micsupp_ops = {
116 .enable = arizona_micsupp_enable,
117 .disable = arizona_micsupp_disable,
118 .is_enabled = regulator_is_enabled_regmap,
119
120 .list_voltage = regulator_list_voltage_linear_range,
121 .map_voltage = regulator_map_voltage_linear_range,
122
123 .get_voltage_sel = regulator_get_voltage_sel_regmap,
124 .set_voltage_sel = regulator_set_voltage_sel_regmap,
125
126 .get_bypass = regulator_get_bypass_regmap,
127 .set_bypass = arizona_micsupp_set_bypass,
128 };
129
130 static const struct regulator_linear_range arizona_micsupp_ranges[] = {
131 REGULATOR_LINEAR_RANGE(1700000, 0, 0x1e, 50000),
132 REGULATOR_LINEAR_RANGE(3300000, 0x1f, 0x1f, 0),
133 };
134
135 static const struct regulator_desc arizona_micsupp = {
136 .name = "MICVDD",
137 .supply_name = "CPVDD",
138 .type = REGULATOR_VOLTAGE,
139 .n_voltages = 32,
140 .ops = &arizona_micsupp_ops,
141
142 .vsel_reg = ARIZONA_LDO2_CONTROL_1,
143 .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
144 .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
145 .enable_mask = ARIZONA_CPMIC_ENA,
146 .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
147 .bypass_mask = ARIZONA_CPMIC_BYPASS,
148
149 .linear_ranges = arizona_micsupp_ranges,
150 .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ranges),
151
152 .enable_time = 3000,
153
154 .owner = THIS_MODULE,
155 };
156
157 static const struct regulator_linear_range arizona_micsupp_ext_ranges[] = {
158 REGULATOR_LINEAR_RANGE(900000, 0, 0x14, 25000),
159 REGULATOR_LINEAR_RANGE(1500000, 0x15, 0x27, 100000),
160 };
161
162 static const struct regulator_desc arizona_micsupp_ext = {
163 .name = "MICVDD",
164 .supply_name = "CPVDD",
165 .type = REGULATOR_VOLTAGE,
166 .n_voltages = 40,
167 .ops = &arizona_micsupp_ops,
168
169 .vsel_reg = ARIZONA_LDO2_CONTROL_1,
170 .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
171 .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
172 .enable_mask = ARIZONA_CPMIC_ENA,
173 .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
174 .bypass_mask = ARIZONA_CPMIC_BYPASS,
175
176 .linear_ranges = arizona_micsupp_ext_ranges,
177 .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ext_ranges),
178
179 .enable_time = 3000,
180
181 .owner = THIS_MODULE,
182 };
183
184 static const struct regulator_init_data arizona_micsupp_default = {
185 .constraints = {
186 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
187 REGULATOR_CHANGE_VOLTAGE |
188 REGULATOR_CHANGE_BYPASS,
189 .min_uV = 1700000,
190 .max_uV = 3300000,
191 },
192
193 .num_consumer_supplies = 1,
194 };
195
196 static const struct regulator_init_data arizona_micsupp_ext_default = {
197 .constraints = {
198 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
199 REGULATOR_CHANGE_VOLTAGE |
200 REGULATOR_CHANGE_BYPASS,
201 .min_uV = 900000,
202 .max_uV = 3300000,
203 },
204
205 .num_consumer_supplies = 1,
206 };
207
arizona_micsupp_of_get_pdata(struct arizona_micsupp_pdata * pdata,struct regulator_config * config,const struct regulator_desc * desc)208 static int arizona_micsupp_of_get_pdata(struct arizona_micsupp_pdata *pdata,
209 struct regulator_config *config,
210 const struct regulator_desc *desc)
211 {
212 struct arizona_micsupp *micsupp = config->driver_data;
213 struct device_node *np;
214 struct regulator_init_data *init_data;
215
216 np = of_get_child_by_name(config->dev->of_node, "micvdd");
217
218 if (np) {
219 config->of_node = np;
220
221 init_data = of_get_regulator_init_data(config->dev, np, desc);
222
223 if (init_data) {
224 init_data->consumer_supplies = &micsupp->supply;
225 init_data->num_consumer_supplies = 1;
226
227 pdata->init_data = init_data;
228 }
229 }
230
231 return 0;
232 }
233
arizona_micsupp_common_init(struct platform_device * pdev,struct arizona_micsupp * micsupp,const struct regulator_desc * desc,struct arizona_micsupp_pdata * pdata)234 static int arizona_micsupp_common_init(struct platform_device *pdev,
235 struct arizona_micsupp *micsupp,
236 const struct regulator_desc *desc,
237 struct arizona_micsupp_pdata *pdata)
238 {
239 struct regulator_config config = { };
240 int ret;
241
242 INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
243
244 micsupp->init_data.consumer_supplies = &micsupp->supply;
245 micsupp->supply.supply = "MICVDD";
246 micsupp->supply.dev_name = dev_name(micsupp->dev);
247 micsupp->enable_reg = desc->enable_reg;
248
249 config.dev = micsupp->dev;
250 config.driver_data = micsupp;
251 config.regmap = micsupp->regmap;
252
253 if (IS_ENABLED(CONFIG_OF)) {
254 if (!dev_get_platdata(micsupp->dev)) {
255 ret = arizona_micsupp_of_get_pdata(pdata, &config,
256 desc);
257 if (ret < 0)
258 return ret;
259 }
260 }
261
262 if (pdata->init_data)
263 config.init_data = pdata->init_data;
264 else
265 config.init_data = &micsupp->init_data;
266
267 /* Default to regulated mode */
268 regmap_update_bits(micsupp->regmap, micsupp->enable_reg,
269 ARIZONA_CPMIC_BYPASS, 0);
270
271 micsupp->regulator = devm_regulator_register(&pdev->dev,
272 desc,
273 &config);
274
275 of_node_put(config.of_node);
276
277 if (IS_ERR(micsupp->regulator)) {
278 ret = PTR_ERR(micsupp->regulator);
279 dev_err(micsupp->dev, "Failed to register mic supply: %d\n",
280 ret);
281 return ret;
282 }
283
284 platform_set_drvdata(pdev, micsupp);
285
286 return 0;
287 }
288
arizona_micsupp_probe(struct platform_device * pdev)289 static int arizona_micsupp_probe(struct platform_device *pdev)
290 {
291 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
292 const struct regulator_desc *desc;
293 struct arizona_micsupp *micsupp;
294
295 micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
296 if (!micsupp)
297 return -ENOMEM;
298
299 micsupp->regmap = arizona->regmap;
300 micsupp->dapm = &arizona->dapm;
301 micsupp->dev = arizona->dev;
302
303 /*
304 * Since the chip usually supplies itself we provide some
305 * default init_data for it. This will be overridden with
306 * platform data if provided.
307 */
308 switch (arizona->type) {
309 case WM5110:
310 case WM8280:
311 desc = &arizona_micsupp_ext;
312 micsupp->init_data = arizona_micsupp_ext_default;
313 break;
314 default:
315 desc = &arizona_micsupp;
316 micsupp->init_data = arizona_micsupp_default;
317 break;
318 }
319
320 return arizona_micsupp_common_init(pdev, micsupp, desc,
321 &arizona->pdata.micvdd);
322 }
323
324 static struct platform_driver arizona_micsupp_driver = {
325 .probe = arizona_micsupp_probe,
326 .driver = {
327 .name = "arizona-micsupp",
328 },
329 };
330
331 module_platform_driver(arizona_micsupp_driver);
332
333 /* Module information */
334 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
335 MODULE_DESCRIPTION("Arizona microphone supply driver");
336 MODULE_LICENSE("GPL");
337 MODULE_ALIAS("platform:arizona-micsupp");
338