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