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 int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  38                                         unsigned int selector)
  39 {
  40         if (selector >= rdev->desc->n_voltages)
  41                 return -EINVAL;
  42
  43         if (selector == rdev->desc->n_voltages - 1)
  44                 return 1800000;
  45         else
  46                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  47 }
  48
  49 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  50                                        int min_uV, int max_uV)
  51 {
  52         int sel;
  53
  54         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  55         if (sel >= rdev->desc->n_voltages)
  56                 sel = rdev->desc->n_voltages - 1;
  57
  58         return sel;
  59 }
  60
  61 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  62                                            unsigned sel)
  63 {
  64         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  65         struct regmap *regmap = ldo->arizona->regmap;
  66         unsigned int val;
  67         int ret;
  68
  69         if (sel == rdev->desc->n_voltages - 1)
  70                 val = ARIZONA_LDO1_HI_PWR;
  71         else
  72                 val = 0;
  73
  74         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  75                                  ARIZONA_LDO1_HI_PWR, val);
  76         if (ret != 0)
  77                 return ret;
  78
  79         ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
  80                                  ARIZONA_SUBSYS_MAX_FREQ, val);
  81         if (ret != 0)
  82                 return ret;
  83
  84         if (val)
  85                 return 0;
  86
  87         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  88
  89         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  90                                   ARIZONA_LDO1_VSEL_MASK, val);
  91 }
  92
  93 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  94 {
  95         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  96         struct regmap *regmap = ldo->arizona->regmap;
  97         unsigned int val;
  98         int ret;
  99
 100         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
 101         if (ret != 0)
 102                 return ret;
 103
 104         if (val & ARIZONA_LDO1_HI_PWR)
 105                 return rdev->desc->n_voltages - 1;
 106
 107         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 108         if (ret != 0)
 109                 return ret;
 110
 111         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 112 }
 113
 114 static struct regulator_ops arizona_ldo1_hc_ops = {
 115         .list_voltage = arizona_ldo1_hc_list_voltage,
 116         .map_voltage = arizona_ldo1_hc_map_voltage,
 117         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 118         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 119         .get_bypass = regulator_get_bypass_regmap,
 120         .set_bypass = regulator_set_bypass_regmap,
 121 };
 122
 123 static const struct regulator_desc arizona_ldo1_hc = {
 124         .name = "LDO1",
 125         .supply_name = "LDOVDD",
 126         .type = REGULATOR_VOLTAGE,
 127         .ops = &arizona_ldo1_hc_ops,
 128
 129         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 130         .bypass_mask = ARIZONA_LDO1_BYPASS,
 131         .min_uV = 900000,
 132         .uV_step = 50000,
 133         .n_voltages = 8,
 134         .enable_time = 1500,
 135
 136         .owner = THIS_MODULE,
 137 };
 138
 139 static struct regulator_ops arizona_ldo1_ops = {
 140         .list_voltage = regulator_list_voltage_linear,
 141         .map_voltage = regulator_map_voltage_linear,
 142         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 143         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 144         .get_bypass = regulator_get_bypass_regmap,
 145         .set_bypass = regulator_set_bypass_regmap,
 146 };
 147
 148 static const struct regulator_desc arizona_ldo1 = {
 149         .name = "LDO1",
 150         .supply_name = "LDOVDD",
 151         .type = REGULATOR_VOLTAGE,
 152         .ops = &arizona_ldo1_ops,
 153
 154         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 155         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 156         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 157         .bypass_mask = ARIZONA_LDO1_BYPASS,
 158         .min_uV = 900000,
 159         .uV_step = 50000,
 160         .n_voltages = 7,
 161         .enable_time = 500,
 162
 163         .owner = THIS_MODULE,
 164 };
 165
 166 static const struct regulator_init_data arizona_ldo1_dvfs = {
 167         .constraints = {
 168                 .min_uV = 1200000,
 169                 .max_uV = 1800000,
 170                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 171                                   REGULATOR_CHANGE_VOLTAGE,
 172         },
 173         .num_consumer_supplies = 1,
 174 };
 175
 176 static const struct regulator_init_data arizona_ldo1_default = {
 177         .constraints = {
 178                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 179         },
 180         .num_consumer_supplies = 1,
 181 };
 182
 183 static int arizona_ldo1_probe(struct platform_device *pdev)
 184 {
 185         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 186         const struct regulator_desc *desc;
 187         struct regulator_config config = { };
 188         struct arizona_ldo1 *ldo1;
 189         int ret;
 190
 191         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 192         if (ldo1 == NULL) {
 193                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 194                 return -ENOMEM;
 195         }
 196
 197         ldo1->arizona = arizona;
 198
 199         /*
 200          * Since the chip usually supplies itself we provide some
 201          * default init_data for it.  This will be overridden with
 202          * platform data if provided.
 203          */
 204         switch (arizona->type) {
 205         case WM5102:
 206                 desc = &arizona_ldo1_hc;
 207                 ldo1->init_data = arizona_ldo1_dvfs;
 208                 break;
 209         default:
 210                 desc = &arizona_ldo1;
 211                 ldo1->init_data = arizona_ldo1_default;
 212                 break;
 213         }
 214
 215         ldo1->init_data.consumer_supplies = &ldo1->supply;
 216         ldo1->supply.supply = "DCVDD";
 217         ldo1->supply.dev_name = dev_name(arizona->dev);
 218
 219         config.dev = arizona->dev;
 220         config.driver_data = ldo1;
 221         config.regmap = arizona->regmap;
 222         config.ena_gpio = arizona->pdata.ldoena;
 223
 224         if (arizona->pdata.ldo1)
 225                 config.init_data = arizona->pdata.ldo1;
 226         else
 227                 config.init_data = &ldo1->init_data;
 228
 229         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 230         if (IS_ERR(ldo1->regulator)) {
 231                 ret = PTR_ERR(ldo1->regulator);
 232                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 233                         ret);
 234                 return ret;
 235         }
 236
 237         platform_set_drvdata(pdev, ldo1);
 238
 239         return 0;
 240 }
 241
 242 static struct platform_driver arizona_ldo1_driver = {
 243         .probe = arizona_ldo1_probe,
 244         .driver         = {
 245                 .name   = "arizona-ldo1",
 246                 .owner  = THIS_MODULE,
 247         },
 248 };
 249
 250 module_platform_driver(arizona_ldo1_driver);
 251
 252 /* Module information */
 253 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 254 MODULE_DESCRIPTION("Arizona LDO1 driver");
 255 MODULE_LICENSE("GPL");
 256 MODULE_ALIAS("platform:arizona-ldo1");