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