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 #define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f
  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 int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
  44                                         unsigned int selector)
  45 {
  46         if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
  47                 return -EINVAL;
  48
  49         if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
  50                 return 3300000;
  51         else
  52                 return (selector * 50000) + 1700000;
  53 }
  54
  55 static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
  56                                        int min_uV, int max_uV)
  57 {
  58         unsigned int voltage;
  59         int selector;
  60
  61         if (min_uV < 1700000)
  62                 min_uV = 1700000;
  63
  64         if (min_uV > 3200000)
  65                 selector = ARIZONA_MICSUPP_MAX_SELECTOR;
  66         else
  67                 selector = DIV_ROUND_UP(min_uV - 1700000, 50000);
  68
  69         if (selector < 0)
  70                 return -EINVAL;
  71
  72         voltage = arizona_micsupp_list_voltage(rdev, selector);
  73         if (voltage < min_uV || voltage > max_uV)
  74                 return -EINVAL;
  75
  76         return selector;
  77 }
  78
  79 static void arizona_micsupp_check_cp(struct work_struct *work)
  80 {
  81         struct arizona_micsupp *micsupp =
  82                 container_of(work, struct arizona_micsupp, check_cp_work);
  83         struct snd_soc_dapm_context *dapm = micsupp->arizona->dapm;
  84         struct arizona *arizona = micsupp->arizona;
  85         struct regmap *regmap = arizona->regmap;
  86         unsigned int reg;
  87         int ret;
  88
  89         ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, &reg);
  90         if (ret != 0) {
  91                 dev_err(arizona->dev, "Failed to read CP state: %d\n", ret);
  92                 return;
  93         }
  94
  95         if (dapm) {
  96                 if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) ==
  97                     ARIZONA_CPMIC_ENA)
  98                         snd_soc_dapm_force_enable_pin(dapm, "MICSUPP");
  99                 else
 100                         snd_soc_dapm_disable_pin(dapm, "MICSUPP");
 101
 102                 snd_soc_dapm_sync(dapm);
 103         }
 104 }
 105
 106 static int arizona_micsupp_enable(struct regulator_dev *rdev)
 107 {
 108         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 109         int ret;
 110
 111         ret = regulator_enable_regmap(rdev);
 112
 113         if (ret == 0)
 114                 schedule_work(&micsupp->check_cp_work);
 115
 116         return ret;
 117 }
 118
 119 static int arizona_micsupp_disable(struct regulator_dev *rdev)
 120 {
 121         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 122         int ret;
 123
 124         ret = regulator_disable_regmap(rdev);
 125         if (ret == 0)
 126                 schedule_work(&micsupp->check_cp_work);
 127
 128         return ret;
 129 }
 130
 131 static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena)
 132 {
 133         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 134         int ret;
 135
 136         ret = regulator_set_bypass_regmap(rdev, ena);
 137         if (ret == 0)
 138                 schedule_work(&micsupp->check_cp_work);
 139
 140         return ret;
 141 }
 142
 143 static struct regulator_ops arizona_micsupp_ops = {
 144         .enable = arizona_micsupp_enable,
 145         .disable = arizona_micsupp_disable,
 146         .is_enabled = regulator_is_enabled_regmap,
 147
 148         .list_voltage = arizona_micsupp_list_voltage,
 149         .map_voltage = arizona_micsupp_map_voltage,
 150
 151         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 152         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 153
 154         .get_bypass = regulator_get_bypass_regmap,
 155         .set_bypass = arizona_micsupp_set_bypass,
 156 };
 157
 158 static const struct regulator_desc arizona_micsupp = {
 159         .name = "MICVDD",
 160         .supply_name = "CPVDD",
 161         .type = REGULATOR_VOLTAGE,
 162         .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
 163         .ops = &arizona_micsupp_ops,
 164
 165         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
 166         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
 167         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 168         .enable_mask = ARIZONA_CPMIC_ENA,
 169         .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 170         .bypass_mask = ARIZONA_CPMIC_BYPASS,
 171
 172         .enable_time = 3000,
 173
 174         .owner = THIS_MODULE,
 175 };
 176
 177 static const struct regulator_init_data arizona_micsupp_default = {
 178         .constraints = {
 179                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 180                                 REGULATOR_CHANGE_VOLTAGE |
 181                                 REGULATOR_CHANGE_BYPASS,
 182                 .min_uV = 1700000,
 183                 .max_uV = 3300000,
 184         },
 185
 186         .num_consumer_supplies = 1,
 187 };
 188
 189 static int arizona_micsupp_probe(struct platform_device *pdev)
 190 {
 191         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 192         struct regulator_config config = { };
 193         struct arizona_micsupp *micsupp;
 194         int ret;
 195
 196         micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 197         if (micsupp == NULL) {
 198                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 199                 return -ENOMEM;
 200         }
 201
 202         micsupp->arizona = arizona;
 203         INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
 204
 205         /*
 206          * Since the chip usually supplies itself we provide some
 207          * default init_data for it.  This will be overridden with
 208          * platform data if provided.
 209          */
 210         micsupp->init_data = arizona_micsupp_default;
 211         micsupp->init_data.consumer_supplies = &micsupp->supply;
 212         micsupp->supply.supply = "MICVDD";
 213         micsupp->supply.dev_name = dev_name(arizona->dev);
 214
 215         config.dev = arizona->dev;
 216         config.driver_data = micsupp;
 217         config.regmap = arizona->regmap;
 218
 219         if (arizona->pdata.micvdd)
 220                 config.init_data = arizona->pdata.micvdd;
 221         else
 222                 config.init_data = &micsupp->init_data;
 223
 224         /* Default to regulated mode until the API supports bypass */
 225         regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
 226                            ARIZONA_CPMIC_BYPASS, 0);
 227
 228         micsupp->regulator = regulator_register(&arizona_micsupp, &config);
 229         if (IS_ERR(micsupp->regulator)) {
 230                 ret = PTR_ERR(micsupp->regulator);
 231                 dev_err(arizona->dev, "Failed to register mic supply: %d\n",
 232                         ret);
 233                 return ret;
 234         }
 235
 236         platform_set_drvdata(pdev, micsupp);
 237
 238         return 0;
 239 }
 240
 241 static int arizona_micsupp_remove(struct platform_device *pdev)
 242 {
 243         struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
 244
 245         regulator_unregister(micsupp->regulator);
 246
 247         return 0;
 248 }
 249
 250 static struct platform_driver arizona_micsupp_driver = {
 251         .probe = arizona_micsupp_probe,
 252         .remove = arizona_micsupp_remove,
 253         .driver         = {
 254                 .name   = "arizona-micsupp",
 255                 .owner  = THIS_MODULE,
 256         },
 257 };
 258
 259 module_platform_driver(arizona_micsupp_driver);
 260
 261 /* Module information */
 262 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 263 MODULE_DESCRIPTION("Arizona microphone supply driver");
 264 MODULE_LICENSE("GPL");
 265 MODULE_ALIAS("platform:arizona-micsupp");