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
33struct 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
43static 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
70static 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
83static 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
95static 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
107static 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
122static 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
127static 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
149static 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
154static 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
176static 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
188static 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
200static int arizona_micsupp_of_get_pdata(struct arizona *arizona,
201					struct regulator_config *config)
202{
203	struct arizona_pdata *pdata = &arizona->pdata;
204	struct arizona_micsupp *micsupp = config->driver_data;
205	struct device_node *np;
206	struct regulator_init_data *init_data;
207
208	np = of_get_child_by_name(arizona->dev->of_node, "micvdd");
209
210	if (np) {
211		config->of_node = np;
212
213		init_data = of_get_regulator_init_data(arizona->dev, np);
214
215		if (init_data) {
216			init_data->consumer_supplies = &micsupp->supply;
217			init_data->num_consumer_supplies = 1;
218
219			pdata->micvdd = init_data;
220		}
221	}
222
223	return 0;
224}
225
226static int arizona_micsupp_probe(struct platform_device *pdev)
227{
228	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
229	const struct regulator_desc *desc;
230	struct regulator_config config = { };
231	struct arizona_micsupp *micsupp;
232	int ret;
233
234	micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
235	if (!micsupp)
236		return -ENOMEM;
237
238	micsupp->arizona = arizona;
239	INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
240
241	/*
242	 * Since the chip usually supplies itself we provide some
243	 * default init_data for it.  This will be overridden with
244	 * platform data if provided.
245	 */
246	switch (arizona->type) {
247	case WM5110:
248		desc = &arizona_micsupp_ext;
249		micsupp->init_data = arizona_micsupp_ext_default;
250		break;
251	default:
252		desc = &arizona_micsupp;
253		micsupp->init_data = arizona_micsupp_default;
254		break;
255	}
256
257	micsupp->init_data.consumer_supplies = &micsupp->supply;
258	micsupp->supply.supply = "MICVDD";
259	micsupp->supply.dev_name = dev_name(arizona->dev);
260
261	config.dev = arizona->dev;
262	config.driver_data = micsupp;
263	config.regmap = arizona->regmap;
264
265	if (IS_ENABLED(CONFIG_OF)) {
266		if (!dev_get_platdata(arizona->dev)) {
267			ret = arizona_micsupp_of_get_pdata(arizona, &config);
268			if (ret < 0)
269				return ret;
270		}
271	}
272
273	if (arizona->pdata.micvdd)
274		config.init_data = arizona->pdata.micvdd;
275	else
276		config.init_data = &micsupp->init_data;
277
278	/* Default to regulated mode until the API supports bypass */
279	regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
280			   ARIZONA_CPMIC_BYPASS, 0);
281
282	micsupp->regulator = devm_regulator_register(&pdev->dev,
283						     desc,
284						     &config);
285	if (IS_ERR(micsupp->regulator)) {
286		ret = PTR_ERR(micsupp->regulator);
287		dev_err(arizona->dev, "Failed to register mic supply: %d\n",
288			ret);
289		return ret;
290	}
291
292	of_node_put(config.of_node);
293
294	platform_set_drvdata(pdev, micsupp);
295
296	return 0;
297}
298
299static struct platform_driver arizona_micsupp_driver = {
300	.probe = arizona_micsupp_probe,
301	.driver		= {
302		.name	= "arizona-micsupp",
303		.owner	= THIS_MODULE,
304	},
305};
306
307module_platform_driver(arizona_micsupp_driver);
308
309/* Module information */
310MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
311MODULE_DESCRIPTION("Arizona microphone supply driver");
312MODULE_LICENSE("GPL");
313MODULE_ALIAS("platform:arizona-micsupp");
314