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 };
  43
  44 static const struct regulator_desc arizona_ldo1 = {
  45         .name = "LDO1",
  46         .supply_name = "LDOVDD",
  47         .type = REGULATOR_VOLTAGE,
  48         .ops = &arizona_ldo1_ops,
  49
  50         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
  51         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
  52         .min_uV = 900000,
  53         .uV_step = 50000,
  54         .n_voltages = 7,
  55
  56         .owner = THIS_MODULE,
  57 };
  58
  59 static const struct regulator_init_data arizona_ldo1_default = {
  60         .constraints = {
  61                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
  62         },
  63         .num_consumer_supplies = 1,
  64 };
  65
  66 static __devinit int arizona_ldo1_probe(struct platform_device *pdev)
  67 {
  68         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
  69         struct regulator_config config = { };
  70         struct arizona_ldo1 *ldo1;
  71         int ret;
  72
  73         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
  74         if (ldo1 == NULL) {
  75                 dev_err(&pdev->dev, "Unable to allocate private data\n");
  76                 return -ENOMEM;
  77         }
  78
  79         ldo1->arizona = arizona;
  80
  81         /*
  82          * Since the chip usually supplies itself we provide some
  83          * default init_data for it.  This will be overridden with
  84          * platform data if provided.
  85          */
  86         ldo1->init_data = arizona_ldo1_default;
  87         ldo1->init_data.consumer_supplies = &ldo1->supply;
  88         ldo1->supply.supply = "DCVDD";
  89         ldo1->supply.dev_name = dev_name(arizona->dev);
  90
  91         config.dev = arizona->dev;
  92         config.driver_data = ldo1;
  93         config.regmap = arizona->regmap;
  94         config.ena_gpio = arizona->pdata.ldoena;
  95
  96         if (arizona->pdata.ldo1)
  97                 config.init_data = arizona->pdata.ldo1;
  98         else
  99                 config.init_data = &ldo1->init_data;
 100
 101         ldo1->regulator = regulator_register(&arizona_ldo1, &config);
 102         if (IS_ERR(ldo1->regulator)) {
 103                 ret = PTR_ERR(ldo1->regulator);
 104                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 105                         ret);
 106                 return ret;
 107         }
 108
 109         platform_set_drvdata(pdev, ldo1);
 110
 111         return 0;
 112 }
 113
 114 static __devexit int arizona_ldo1_remove(struct platform_device *pdev)
 115 {
 116         struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
 117
 118         regulator_unregister(ldo1->regulator);
 119
 120         return 0;
 121 }
 122
 123 static struct platform_driver arizona_ldo1_driver = {
 124         .probe = arizona_ldo1_probe,
 125         .remove = __devexit_p(arizona_ldo1_remove),
 126         .driver         = {
 127                 .name   = "arizona-ldo1",
 128                 .owner  = THIS_MODULE,
 129         },
 130 };
 131
 132 module_platform_driver(arizona_ldo1_driver);
 133
 134 /* Module information */
 135 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 136 MODULE_DESCRIPTION("Arizona LDO1 driver");
 137 MODULE_LICENSE("GPL");
 138 MODULE_ALIAS("platform:arizona-ldo1");