drivers/regulator/arizona-ldo1.c

   1 /*
   2  * arizona-ldo1.c  --  LDO1 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 struct arizona_ldo1 {
  30         struct regulator_dev *regulator;
  31         struct arizona *arizona;
  32
  33         struct regulator_consumer_supply supply;
  34         struct regulator_init_data init_data;
  35 };
  36
  37 static struct regulator_ops arizona_ldo1_ops = {
  38         .list_voltage = regulator_list_voltage_linear,
  39         .map_voltage = regulator_map_voltage_linear,
  40         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  41         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  42         .get_bypass = regulator_get_bypass_regmap,
  43         .set_bypass = regulator_set_bypass_regmap,
  44 };
  45
  46 static const struct regulator_desc arizona_ldo1 = {
  47         .name = "LDO1",
  48         .supply_name = "LDOVDD",
  49         .type = REGULATOR_VOLTAGE,
  50         .ops = &arizona_ldo1_ops,
  51
  52         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
  53         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
  54         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
  55         .bypass_mask = ARIZONA_LDO1_BYPASS,
  56         .min_uV = 900000,
  57         .uV_step = 50000,
  58         .n_voltages = 7,
  59         .enable_time = 500,
  60
  61         .owner = THIS_MODULE,
  62 };
  63
  64 static const struct regulator_init_data arizona_ldo1_dvfs = {
  65         .constraints = {
  66                 .min_uV = 1200000,
  67                 .max_uV = 1800000,
  68                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
  69                                   REGULATOR_CHANGE_VOLTAGE,
  70         },
  71         .num_consumer_supplies = 1,
  72 };
  73
  74 static const struct regulator_init_data arizona_ldo1_default = {
  75         .constraints = {
  76                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
  77         },
  78         .num_consumer_supplies = 1,
  79 };
  80
  81 static __devinit int arizona_ldo1_probe(struct platform_device *pdev)
  82 {
  83         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
  84         struct regulator_config config = { };
  85         struct arizona_ldo1 *ldo1;
  86         int ret;
  87
  88         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
  89         if (ldo1 == NULL) {
  90                 dev_err(&pdev->dev, "Unable to allocate private data\n");
  91                 return -ENOMEM;
  92         }
  93
  94         ldo1->arizona = arizona;
  95
  96         /*
  97          * Since the chip usually supplies itself we provide some
  98          * default init_data for it.  This will be overridden with
  99          * platform data if provided.
 100          */
 101         switch (arizona->type) {
 102         case WM5102:
 103                 ldo1->init_data = arizona_ldo1_dvfs;
 104                 break;
 105         default:
 106                 ldo1->init_data = arizona_ldo1_default;
 107                 break;
 108         }
 109
 110         ldo1->init_data.consumer_supplies = &ldo1->supply;
 111         ldo1->supply.supply = "DCVDD";
 112         ldo1->supply.dev_name = dev_name(arizona->dev);
 113
 114         config.dev = arizona->dev;
 115         config.driver_data = ldo1;
 116         config.regmap = arizona->regmap;
 117         config.ena_gpio = arizona->pdata.ldoena;
 118
 119         if (arizona->pdata.ldo1)
 120                 config.init_data = arizona->pdata.ldo1;
 121         else
 122                 config.init_data = &ldo1->init_data;
 123
 124         ldo1->regulator = regulator_register(&arizona_ldo1, &config);
 125         if (IS_ERR(ldo1->regulator)) {
 126                 ret = PTR_ERR(ldo1->regulator);
 127                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 128                         ret);
 129                 return ret;
 130         }
 131
 132         platform_set_drvdata(pdev, ldo1);
 133
 134         return 0;
 135 }
 136
 137 static __devexit int arizona_ldo1_remove(struct platform_device *pdev)
 138 {
 139         struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
 140
 141         regulator_unregister(ldo1->regulator);
 142
 143         return 0;
 144 }
 145
 146 static struct platform_driver arizona_ldo1_driver = {
 147         .probe = arizona_ldo1_probe,
 148         .remove = __devexit_p(arizona_ldo1_remove),
 149         .driver         = {
 150                 .name   = "arizona-ldo1",
 151                 .owner  = THIS_MODULE,
 152         },
 153 };
 154
 155 module_platform_driver(arizona_ldo1_driver);
 156
 157 /* Module information */
 158 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 159 MODULE_DESCRIPTION("Arizona LDO1 driver");
 160 MODULE_LICENSE("GPL");
 161 MODULE_ALIAS("platform:arizona-ldo1");