drivers/regulator/arizona-micsupp.c

   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                 .owner  = THIS_MODULE,
 306         },
 307 };
 308
 309 module_platform_driver(arizona_micsupp_driver);
 310
 311 /* Module information */
 312 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 313 MODULE_DESCRIPTION("Arizona microphone supply driver");
 314 MODULE_LICENSE("GPL");
 315 MODULE_ALIAS("platform:arizona-micsupp");