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/of.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regulator/of_regulator.h>
  25 #include <linux/gpio.h>
  26 #include <linux/slab.h>
  27
  28 #include <linux/mfd/arizona/core.h>
  29 #include <linux/mfd/arizona/pdata.h>
  30 #include <linux/mfd/arizona/registers.h>
  31
  32 struct arizona_ldo1 {
  33         struct regulator_dev *regulator;
  34         struct arizona *arizona;
  35
  36         struct regulator_consumer_supply supply;
  37         struct regulator_init_data init_data;
  38 };
  39
  40 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  41                                         unsigned int selector)
  42 {
  43         if (selector >= rdev->desc->n_voltages)
  44                 return -EINVAL;
  45
  46         if (selector == rdev->desc->n_voltages - 1)
  47                 return 1800000;
  48         else
  49                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  50 }
  51
  52 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  53                                        int min_uV, int max_uV)
  54 {
  55         int sel;
  56
  57         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  58         if (sel >= rdev->desc->n_voltages)
  59                 sel = rdev->desc->n_voltages - 1;
  60
  61         return sel;
  62 }
  63
  64 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  65                                            unsigned sel)
  66 {
  67         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  68         struct regmap *regmap = ldo->arizona->regmap;
  69         unsigned int val;
  70         int ret;
  71
  72         if (sel == rdev->desc->n_voltages - 1)
  73                 val = ARIZONA_LDO1_HI_PWR;
  74         else
  75                 val = 0;
  76
  77         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  78                                  ARIZONA_LDO1_HI_PWR, val);
  79         if (ret != 0)
  80                 return ret;
  81
  82         if (val)
  83                 return 0;
  84
  85         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  86
  87         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  88                                   ARIZONA_LDO1_VSEL_MASK, val);
  89 }
  90
  91 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  92 {
  93         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  94         struct regmap *regmap = ldo->arizona->regmap;
  95         unsigned int val;
  96         int ret;
  97
  98         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
  99         if (ret != 0)
 100                 return ret;
 101
 102         if (val & ARIZONA_LDO1_HI_PWR)
 103                 return rdev->desc->n_voltages - 1;
 104
 105         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 106         if (ret != 0)
 107                 return ret;
 108
 109         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 110 }
 111
 112 static const struct regulator_ops arizona_ldo1_hc_ops = {
 113         .list_voltage = arizona_ldo1_hc_list_voltage,
 114         .map_voltage = arizona_ldo1_hc_map_voltage,
 115         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 116         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 117         .get_bypass = regulator_get_bypass_regmap,
 118         .set_bypass = regulator_set_bypass_regmap,
 119 };
 120
 121 static const struct regulator_desc arizona_ldo1_hc = {
 122         .name = "LDO1",
 123         .supply_name = "LDOVDD",
 124         .type = REGULATOR_VOLTAGE,
 125         .ops = &arizona_ldo1_hc_ops,
 126
 127         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 128         .bypass_mask = ARIZONA_LDO1_BYPASS,
 129         .min_uV = 900000,
 130         .uV_step = 50000,
 131         .n_voltages = 8,
 132         .enable_time = 1500,
 133         .ramp_delay = 24000,
 134
 135         .owner = THIS_MODULE,
 136 };
 137
 138 static const struct regulator_ops arizona_ldo1_ops = {
 139         .list_voltage = regulator_list_voltage_linear,
 140         .map_voltage = regulator_map_voltage_linear,
 141         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 142         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 143 };
 144
 145 static const struct regulator_desc arizona_ldo1 = {
 146         .name = "LDO1",
 147         .supply_name = "LDOVDD",
 148         .type = REGULATOR_VOLTAGE,
 149         .ops = &arizona_ldo1_ops,
 150
 151         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 152         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 153         .min_uV = 900000,
 154         .uV_step = 25000,
 155         .n_voltages = 13,
 156         .enable_time = 500,
 157         .ramp_delay = 24000,
 158
 159         .owner = THIS_MODULE,
 160 };
 161
 162 static const struct regulator_init_data arizona_ldo1_dvfs = {
 163         .constraints = {
 164                 .min_uV = 1200000,
 165                 .max_uV = 1800000,
 166                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 167                                   REGULATOR_CHANGE_VOLTAGE,
 168         },
 169         .num_consumer_supplies = 1,
 170 };
 171
 172 static const struct regulator_init_data arizona_ldo1_default = {
 173         .constraints = {
 174                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 175         },
 176         .num_consumer_supplies = 1,
 177 };
 178
 179 static const struct regulator_init_data arizona_ldo1_wm5110 = {
 180         .constraints = {
 181                 .min_uV = 1175000,
 182                 .max_uV = 1200000,
 183                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 184                                   REGULATOR_CHANGE_VOLTAGE,
 185         },
 186         .num_consumer_supplies = 1,
 187 };
 188
 189 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
 190                                      struct regulator_config *config,
 191                                      const struct regulator_desc *desc)
 192 {
 193         struct arizona_pdata *pdata = &arizona->pdata;
 194         struct arizona_ldo1 *ldo1 = config->driver_data;
 195         struct device_node *np = arizona->dev->of_node;
 196         struct device_node *init_node, *dcvdd_node;
 197         struct regulator_init_data *init_data;
 198
 199         pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0);
 200         if (pdata->ldoena < 0) {
 201                 dev_warn(arizona->dev,
 202                          "LDOENA GPIO property missing/malformed: %d\n",
 203                          pdata->ldoena);
 204                 pdata->ldoena = 0;
 205         } else {
 206                 config->ena_gpio_initialized = true;
 207         }
 208
 209         init_node = of_get_child_by_name(np, "ldo1");
 210         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
 211
 212         if (init_node) {
 213                 config->of_node = init_node;
 214
 215                 init_data = of_get_regulator_init_data(arizona->dev, init_node,
 216                                                        desc);
 217
 218                 if (init_data) {
 219                         init_data->consumer_supplies = &ldo1->supply;
 220                         init_data->num_consumer_supplies = 1;
 221
 222                         if (dcvdd_node && dcvdd_node != init_node)
 223                                 arizona->external_dcvdd = true;
 224
 225                         pdata->ldo1 = init_data;
 226                 }
 227         } else if (dcvdd_node) {
 228                 arizona->external_dcvdd = true;
 229         }
 230
 231         of_node_put(dcvdd_node);
 232
 233         return 0;
 234 }
 235
 236 static int arizona_ldo1_probe(struct platform_device *pdev)
 237 {
 238         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 239         const struct regulator_desc *desc;
 240         struct regulator_config config = { };
 241         struct arizona_ldo1 *ldo1;
 242         int ret;
 243
 244         arizona->external_dcvdd = false;
 245
 246         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 247         if (!ldo1)
 248                 return -ENOMEM;
 249
 250         ldo1->arizona = arizona;
 251
 252         /*
 253          * Since the chip usually supplies itself we provide some
 254          * default init_data for it.  This will be overridden with
 255          * platform data if provided.
 256          */
 257         switch (arizona->type) {
 258         case WM5102:
 259         case WM8997:
 260         case WM8998:
 261         case WM1814:
 262                 desc = &arizona_ldo1_hc;
 263                 ldo1->init_data = arizona_ldo1_dvfs;
 264                 break;
 265         case WM5110:
 266         case WM8280:
 267                 desc = &arizona_ldo1;
 268                 ldo1->init_data = arizona_ldo1_wm5110;
 269                 break;
 270         default:
 271                 desc = &arizona_ldo1;
 272                 ldo1->init_data = arizona_ldo1_default;
 273                 break;
 274         }
 275
 276         ldo1->init_data.consumer_supplies = &ldo1->supply;
 277         ldo1->supply.supply = "DCVDD";
 278         ldo1->supply.dev_name = dev_name(arizona->dev);
 279
 280         config.dev = arizona->dev;
 281         config.driver_data = ldo1;
 282         config.regmap = arizona->regmap;
 283
 284         if (IS_ENABLED(CONFIG_OF)) {
 285                 if (!dev_get_platdata(arizona->dev)) {
 286                         ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
 287                         if (ret < 0)
 288                                 return ret;
 289                 }
 290         }
 291
 292         config.ena_gpio = arizona->pdata.ldoena;
 293
 294         if (arizona->pdata.ldo1)
 295                 config.init_data = arizona->pdata.ldo1;
 296         else
 297                 config.init_data = &ldo1->init_data;
 298
 299         /*
 300          * LDO1 can only be used to supply DCVDD so if it has no
 301          * consumers then DCVDD is supplied externally.
 302          */
 303         if (config.init_data->num_consumer_supplies == 0)
 304                 arizona->external_dcvdd = true;
 305
 306         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 307
 308         of_node_put(config.of_node);
 309
 310         if (IS_ERR(ldo1->regulator)) {
 311                 ret = PTR_ERR(ldo1->regulator);
 312                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 313                         ret);
 314                 return ret;
 315         }
 316
 317         platform_set_drvdata(pdev, ldo1);
 318
 319         return 0;
 320 }
 321
 322 static struct platform_driver arizona_ldo1_driver = {
 323         .probe = arizona_ldo1_probe,
 324         .driver         = {
 325                 .name   = "arizona-ldo1",
 326         },
 327 };
 328
 329 module_platform_driver(arizona_ldo1_driver);
 330
 331 /* Module information */
 332 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 333 MODULE_DESCRIPTION("Arizona LDO1 driver");
 334 MODULE_LICENSE("GPL");
 335 MODULE_ALIAS("platform:arizona-ldo1");