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