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         .get_bypass = regulator_get_bypass_regmap,
  87         .set_bypass = regulator_set_bypass_regmap,
  88 };
  89
  90 static const struct regulator_desc arizona_micsupp = {
  91         .name = "MICVDD",
  92         .supply_name = "CPVDD",
  93         .type = REGULATOR_VOLTAGE,
  94         .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
  95         .ops = &arizona_micsupp_ops,
  96
  97         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
  98         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
  99         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 100         .enable_mask = ARIZONA_CPMIC_ENA,
 101         .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 102         .bypass_mask = ARIZONA_CPMIC_BYPASS,
 103
 104         .owner = THIS_MODULE,
 105 };
 106
 107 static const struct regulator_init_data arizona_micsupp_default = {
 108         .constraints = {
 109                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 110                                 REGULATOR_CHANGE_VOLTAGE,
 111                 .min_uV = 1700000,
 112                 .max_uV = 3300000,
 113         },
 114
 115         .num_consumer_supplies = 1,
 116 };
 117
 118 static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
 119 {
 120         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 121         struct regulator_config config = { };
 122         struct arizona_micsupp *micsupp;
 123         int ret;
 124
 125         micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 126         if (micsupp == NULL) {
 127                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 128                 return -ENOMEM;
 129         }
 130
 131         micsupp->arizona = arizona;
 132
 133         /*
 134          * Since the chip usually supplies itself we provide some
 135          * default init_data for it.  This will be overridden with
 136          * platform data if provided.
 137          */
 138         micsupp->init_data = arizona_micsupp_default;
 139         micsupp->init_data.consumer_supplies = &micsupp->supply;
 140         micsupp->supply.supply = "MICVDD";
 141         micsupp->supply.dev_name = dev_name(arizona->dev);
 142
 143         config.dev = arizona->dev;
 144         config.driver_data = micsupp;
 145         config.regmap = arizona->regmap;
 146
 147         if (arizona->pdata.micvdd)
 148                 config.init_data = arizona->pdata.micvdd;
 149         else
 150                 config.init_data = &micsupp->init_data;
 151
 152         /* Default to regulated mode until the API supports bypass */
 153         regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
 154                            ARIZONA_CPMIC_BYPASS, 0);
 155
 156         micsupp->regulator = regulator_register(&arizona_micsupp, &config);
 157         if (IS_ERR(micsupp->regulator)) {
 158                 ret = PTR_ERR(micsupp->regulator);
 159                 dev_err(arizona->dev, "Failed to register mic supply: %d\n",
 160                         ret);
 161                 return ret;
 162         }
 163
 164         platform_set_drvdata(pdev, micsupp);
 165
 166         return 0;
 167 }
 168
 169 static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
 170 {
 171         struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
 172
 173         regulator_unregister(micsupp->regulator);
 174
 175         return 0;
 176 }
 177
 178 static struct platform_driver arizona_micsupp_driver = {
 179         .probe = arizona_micsupp_probe,
 180         .remove = __devexit_p(arizona_micsupp_remove),
 181         .driver         = {
 182                 .name   = "arizona-micsupp",
 183                 .owner  = THIS_MODULE,
 184         },
 185 };
 186
 187 module_platform_driver(arizona_micsupp_driver);
 188
 189 /* Module information */
 190 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 191 MODULE_DESCRIPTION("Arizona microphone supply driver");
 192 MODULE_LICENSE("GPL");
 193 MODULE_ALIAS("platform:arizona-micsupp");