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
  25 #include <linux/mfd/arizona/core.h>
  26 #include <linux/mfd/arizona/pdata.h>
  27 #include <linux/mfd/arizona/registers.h>
  28
  29 #define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f
  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
  39 static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
  40                                         unsigned int selector)
  41 {
  42         if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
  43                 return -EINVAL;
  44
  45         if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
  46                 return 3300000;
  47         else
  48                 return (selector * 50000) + 1700000;
  49 }
  50
  51 static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
  52                                        int min_uV, int max_uV)
  53 {
  54         unsigned int voltage;
  55         int selector;
  56
  57         if (min_uV < 1700000)
  58                 min_uV = 1700000;
  59
  60         if (min_uV > 3200000)
  61                 selector = ARIZONA_MICSUPP_MAX_SELECTOR;
  62         else
  63                 selector = DIV_ROUND_UP(min_uV - 1700000, 50000);
  64
  65         if (selector < 0)
  66                 return -EINVAL;
  67
  68         voltage = arizona_micsupp_list_voltage(rdev, selector);
  69         if (voltage < min_uV || voltage > max_uV)
  70                 return -EINVAL;
  71
  72         return selector;
  73 }
  74
  75 static struct regulator_ops arizona_micsupp_ops = {
  76         .enable = regulator_enable_regmap,
  77         .disable = regulator_disable_regmap,
  78         .is_enabled = regulator_is_enabled_regmap,
  79
  80         .list_voltage = arizona_micsupp_list_voltage,
  81         .map_voltage = arizona_micsupp_map_voltage,
  82
  83         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  84         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  85 };
  86
  87 static const struct regulator_desc arizona_micsupp = {
  88         .name = "MICVDD",
  89         .supply_name = "CPVDD",
  90         .type = REGULATOR_VOLTAGE,
  91         .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
  92         .ops = &arizona_micsupp_ops,
  93
  94         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
  95         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
  96         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
  97         .enable_mask = ARIZONA_CPMIC_ENA,
  98
  99         .owner = THIS_MODULE,
 100 };
 101
 102 static const struct regulator_init_data arizona_micsupp_default = {
 103         .constraints = {
 104                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 105                                 REGULATOR_CHANGE_VOLTAGE,
 106                 .min_uV = 1700000,
 107                 .max_uV = 3300000,
 108         },
 109
 110         .num_consumer_supplies = 1,
 111 };
 112
 113 static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
 114 {
 115         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 116         struct regulator_config config = { };
 117         struct arizona_micsupp *micsupp;
 118         int ret;
 119
 120         micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 121         if (micsupp == NULL) {
 122                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 123                 return -ENOMEM;
 124         }
 125
 126         micsupp->arizona = arizona;
 127
 128         /*
 129          * Since the chip usually supplies itself we provide some
 130          * default init_data for it.  This will be overridden with
 131          * platform data if provided.
 132          */
 133         micsupp->init_data = arizona_micsupp_default;
 134         micsupp->init_data.consumer_supplies = &micsupp->supply;
 135         micsupp->supply.supply = "MICVDD";
 136         micsupp->supply.dev_name = dev_name(arizona->dev);
 137
 138         config.dev = arizona->dev;
 139         config.driver_data = micsupp;
 140         config.regmap = arizona->regmap;
 141
 142         if (arizona->pdata.micvdd)
 143                 config.init_data = arizona->pdata.micvdd;
 144         else
 145                 config.init_data = &micsupp->init_data;
 146
 147         /* Default to regulated mode until the API supports bypass */
 148         regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
 149                            ARIZONA_CPMIC_BYPASS, 0);
 150
 151         micsupp->regulator = regulator_register(&arizona_micsupp, &config);
 152         if (IS_ERR(micsupp->regulator)) {
 153                 ret = PTR_ERR(micsupp->regulator);
 154                 dev_err(arizona->dev, "Failed to register mic supply: %d\n",
 155                         ret);
 156                 return ret;
 157         }
 158
 159         platform_set_drvdata(pdev, micsupp);
 160
 161         return 0;
 162 }
 163
 164 static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
 165 {
 166         struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
 167
 168         regulator_unregister(micsupp->regulator);
 169
 170         return 0;
 171 }
 172
 173 static struct platform_driver arizona_micsupp_driver = {
 174         .probe = arizona_micsupp_probe,
 175         .remove = __devexit_p(arizona_micsupp_remove),
 176         .driver         = {
 177                 .name   = "arizona-micsupp",
 178                 .owner  = THIS_MODULE,
 179         },
 180 };
 181
 182 module_platform_driver(arizona_micsupp_driver);
 183
 184 /* Module information */
 185 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 186 MODULE_DESCRIPTION("Arizona microphone supply driver");
 187 MODULE_LICENSE("GPL");
 188 MODULE_ALIAS("platform:arizona-micsupp");