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					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
227static 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	case WM8280:
250		desc = &arizona_micsupp_ext;
251		micsupp->init_data = arizona_micsupp_ext_default;
252		break;
253	default:
254		desc = &arizona_micsupp;
255		micsupp->init_data = arizona_micsupp_default;
256		break;
257	}
258
259	micsupp->init_data.consumer_supplies = &micsupp->supply;
260	micsupp->supply.supply = "MICVDD";
261	micsupp->supply.dev_name = dev_name(arizona->dev);
262
263	config.dev = arizona->dev;
264	config.driver_data = micsupp;
265	config.regmap = arizona->regmap;
266
267	if (IS_ENABLED(CONFIG_OF)) {
268		if (!dev_get_platdata(arizona->dev)) {
269			ret = arizona_micsupp_of_get_pdata(arizona, &config,
270							   desc);
271			if (ret < 0)
272				return ret;
273		}
274	}
275
276	if (arizona->pdata.micvdd)
277		config.init_data = arizona->pdata.micvdd;
278	else
279		config.init_data = &micsupp->init_data;
280
281	/* Default to regulated mode until the API supports bypass */
282	regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
283			   ARIZONA_CPMIC_BYPASS, 0);
284
285	micsupp->regulator = devm_regulator_register(&pdev->dev,
286						     desc,
287						     &config);
288
289	of_node_put(config.of_node);
290
291	if (IS_ERR(micsupp->regulator)) {
292		ret = PTR_ERR(micsupp->regulator);
293		dev_err(arizona->dev, "Failed to register mic supply: %d\n",
294			ret);
295		return ret;
296	}
297
298	platform_set_drvdata(pdev, micsupp);
299
300	return 0;
301}
302
303static struct platform_driver arizona_micsupp_driver = {
304	.probe = arizona_micsupp_probe,
305	.driver		= {
306		.name	= "arizona-micsupp",
307	},
308};
309
310module_platform_driver(arizona_micsupp_driver);
311
312/* Module information */
313MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
314MODULE_DESCRIPTION("Arizona microphone supply driver");
315MODULE_LICENSE("GPL");
316MODULE_ALIAS("platform:arizona-micsupp");