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 snd_soc_component *component = snd_soc_dapm_to_component(dapm);
  49         struct arizona *arizona = micsupp->arizona;
  50         struct regmap *regmap = arizona->regmap;
  51         unsigned int reg;
  52         int ret;
  53
  54         ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, &reg);
  55         if (ret != 0) {
  56                 dev_err(arizona->dev, "Failed to read CP state: %d\n", ret);
  57                 return;
  58         }
  59
  60         if (dapm) {
  61                 if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) ==
  62                     ARIZONA_CPMIC_ENA)
  63                         snd_soc_component_force_enable_pin(component,
  64                                                            "MICSUPP");
  65                 else
  66                         snd_soc_component_disable_pin(component, "MICSUPP");
  67
  68                 snd_soc_dapm_sync(dapm);
  69         }
  70 }
  71
  72 static int arizona_micsupp_enable(struct regulator_dev *rdev)
  73 {
  74         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
  75         int ret;
  76
  77         ret = regulator_enable_regmap(rdev);
  78
  79         if (ret == 0)
  80                 schedule_work(&micsupp->check_cp_work);
  81
  82         return ret;
  83 }
  84
  85 static int arizona_micsupp_disable(struct regulator_dev *rdev)
  86 {
  87         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
  88         int ret;
  89
  90         ret = regulator_disable_regmap(rdev);
  91         if (ret == 0)
  92                 schedule_work(&micsupp->check_cp_work);
  93
  94         return ret;
  95 }
  96
  97 static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena)
  98 {
  99         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 100         int ret;
 101
 102         ret = regulator_set_bypass_regmap(rdev, ena);
 103         if (ret == 0)
 104                 schedule_work(&micsupp->check_cp_work);
 105
 106         return ret;
 107 }
 108
 109 static const struct regulator_ops arizona_micsupp_ops = {
 110         .enable = arizona_micsupp_enable,
 111         .disable = arizona_micsupp_disable,
 112         .is_enabled = regulator_is_enabled_regmap,
 113
 114         .list_voltage = regulator_list_voltage_linear_range,
 115         .map_voltage = regulator_map_voltage_linear_range,
 116
 117         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 118         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 119
 120         .get_bypass = regulator_get_bypass_regmap,
 121         .set_bypass = arizona_micsupp_set_bypass,
 122 };
 123
 124 static const struct regulator_linear_range arizona_micsupp_ranges[] = {
 125         REGULATOR_LINEAR_RANGE(1700000, 0,    0x1e, 50000),
 126         REGULATOR_LINEAR_RANGE(3300000, 0x1f, 0x1f, 0),
 127 };
 128
 129 static const struct regulator_desc arizona_micsupp = {
 130         .name = "MICVDD",
 131         .supply_name = "CPVDD",
 132         .type = REGULATOR_VOLTAGE,
 133         .n_voltages = 32,
 134         .ops = &arizona_micsupp_ops,
 135
 136         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
 137         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
 138         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 139         .enable_mask = ARIZONA_CPMIC_ENA,
 140         .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 141         .bypass_mask = ARIZONA_CPMIC_BYPASS,
 142
 143         .linear_ranges = arizona_micsupp_ranges,
 144         .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ranges),
 145
 146         .enable_time = 3000,
 147
 148         .owner = THIS_MODULE,
 149 };
 150
 151 static const struct regulator_linear_range arizona_micsupp_ext_ranges[] = {
 152         REGULATOR_LINEAR_RANGE(900000,  0,    0x14, 25000),
 153         REGULATOR_LINEAR_RANGE(1500000, 0x15, 0x27, 100000),
 154 };
 155
 156 static const struct regulator_desc arizona_micsupp_ext = {
 157         .name = "MICVDD",
 158         .supply_name = "CPVDD",
 159         .type = REGULATOR_VOLTAGE,
 160         .n_voltages = 40,
 161         .ops = &arizona_micsupp_ops,
 162
 163         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
 164         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
 165         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 166         .enable_mask = ARIZONA_CPMIC_ENA,
 167         .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 168         .bypass_mask = ARIZONA_CPMIC_BYPASS,
 169
 170         .linear_ranges = arizona_micsupp_ext_ranges,
 171         .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ext_ranges),
 172
 173         .enable_time = 3000,
 174
 175         .owner = THIS_MODULE,
 176 };
 177
 178 static const struct regulator_init_data arizona_micsupp_default = {
 179         .constraints = {
 180                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 181                                 REGULATOR_CHANGE_VOLTAGE |
 182                                 REGULATOR_CHANGE_BYPASS,
 183                 .min_uV = 1700000,
 184                 .max_uV = 3300000,
 185         },
 186
 187         .num_consumer_supplies = 1,
 188 };
 189
 190 static const struct regulator_init_data arizona_micsupp_ext_default = {
 191         .constraints = {
 192                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 193                                 REGULATOR_CHANGE_VOLTAGE |
 194                                 REGULATOR_CHANGE_BYPASS,
 195                 .min_uV = 900000,
 196                 .max_uV = 3300000,
 197         },
 198
 199         .num_consumer_supplies = 1,
 200 };
 201
 202 static int arizona_micsupp_of_get_pdata(struct arizona *arizona,
 203                                         struct regulator_config *config,
 204                                         const struct regulator_desc *desc)
 205 {
 206         struct arizona_pdata *pdata = &arizona->pdata;
 207         struct arizona_micsupp *micsupp = config->driver_data;
 208         struct device_node *np;
 209         struct regulator_init_data *init_data;
 210
 211         np = of_get_child_by_name(arizona->dev->of_node, "micvdd");
 212
 213         if (np) {
 214                 config->of_node = np;
 215
 216                 init_data = of_get_regulator_init_data(arizona->dev, np, desc);
 217
 218                 if (init_data) {
 219                         init_data->consumer_supplies = &micsupp->supply;
 220                         init_data->num_consumer_supplies = 1;
 221
 222                         pdata->micvdd = init_data;
 223                 }
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int arizona_micsupp_probe(struct platform_device *pdev)
 230 {
 231         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 232         const struct regulator_desc *desc;
 233         struct regulator_config config = { };
 234         struct arizona_micsupp *micsupp;
 235         int ret;
 236
 237         micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 238         if (!micsupp)
 239                 return -ENOMEM;
 240
 241         micsupp->arizona = arizona;
 242         INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
 243
 244         /*
 245          * Since the chip usually supplies itself we provide some
 246          * default init_data for it.  This will be overridden with
 247          * platform data if provided.
 248          */
 249         switch (arizona->type) {
 250         case WM5110:
 251         case WM8280:
 252                 desc = &arizona_micsupp_ext;
 253                 micsupp->init_data = arizona_micsupp_ext_default;
 254                 break;
 255         default:
 256                 desc = &arizona_micsupp;
 257                 micsupp->init_data = arizona_micsupp_default;
 258                 break;
 259         }
 260
 261         micsupp->init_data.consumer_supplies = &micsupp->supply;
 262         micsupp->supply.supply = "MICVDD";
 263         micsupp->supply.dev_name = dev_name(arizona->dev);
 264
 265         config.dev = arizona->dev;
 266         config.driver_data = micsupp;
 267         config.regmap = arizona->regmap;
 268
 269         if (IS_ENABLED(CONFIG_OF)) {
 270                 if (!dev_get_platdata(arizona->dev)) {
 271                         ret = arizona_micsupp_of_get_pdata(arizona, &config,
 272                                                            desc);
 273                         if (ret < 0)
 274                                 return ret;
 275                 }
 276         }
 277
 278         if (arizona->pdata.micvdd)
 279                 config.init_data = arizona->pdata.micvdd;
 280         else
 281                 config.init_data = &micsupp->init_data;
 282
 283         /* Default to regulated mode until the API supports bypass */
 284         regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
 285                            ARIZONA_CPMIC_BYPASS, 0);
 286
 287         micsupp->regulator = devm_regulator_register(&pdev->dev,
 288                                                      desc,
 289                                                      &config);
 290
 291         of_node_put(config.of_node);
 292
 293         if (IS_ERR(micsupp->regulator)) {
 294                 ret = PTR_ERR(micsupp->regulator);
 295                 dev_err(arizona->dev, "Failed to register mic supply: %d\n",
 296                         ret);
 297                 return ret;
 298         }
 299
 300         platform_set_drvdata(pdev, micsupp);
 301
 302         return 0;
 303 }
 304
 305 static struct platform_driver arizona_micsupp_driver = {
 306         .probe = arizona_micsupp_probe,
 307         .driver         = {
 308                 .name   = "arizona-micsupp",
 309         },
 310 };
 311
 312 module_platform_driver(arizona_micsupp_driver);
 313
 314 /* Module information */
 315 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 316 MODULE_DESCRIPTION("Arizona microphone supply driver");
 317 MODULE_LICENSE("GPL");
 318 MODULE_ALIAS("platform:arizona-micsupp");