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/gpio/consumer.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/slab.h>
  26
  27 #include <linux/regulator/arizona-ldo1.h>
  28
  29 #include <linux/mfd/arizona/core.h>
  30 #include <linux/mfd/arizona/pdata.h>
  31 #include <linux/mfd/arizona/registers.h>
  32
  33 struct arizona_ldo1 {
  34         struct regulator_dev *regulator;
  35         struct regmap *regmap;
  36
  37         struct regulator_consumer_supply supply;
  38         struct regulator_init_data init_data;
  39 };
  40
  41 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  42                                         unsigned int selector)
  43 {
  44         if (selector >= rdev->desc->n_voltages)
  45                 return -EINVAL;
  46
  47         if (selector == rdev->desc->n_voltages - 1)
  48                 return 1800000;
  49         else
  50                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  51 }
  52
  53 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  54                                        int min_uV, int max_uV)
  55 {
  56         int sel;
  57
  58         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  59         if (sel >= rdev->desc->n_voltages)
  60                 sel = rdev->desc->n_voltages - 1;
  61
  62         return sel;
  63 }
  64
  65 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  66                                            unsigned sel)
  67 {
  68         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  69         struct regmap *regmap = ldo->regmap;
  70         unsigned int val;
  71         int ret;
  72
  73         if (sel == rdev->desc->n_voltages - 1)
  74                 val = ARIZONA_LDO1_HI_PWR;
  75         else
  76                 val = 0;
  77
  78         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  79                                  ARIZONA_LDO1_HI_PWR, val);
  80         if (ret != 0)
  81                 return ret;
  82
  83         if (val)
  84                 return 0;
  85
  86         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  87
  88         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  89                                   ARIZONA_LDO1_VSEL_MASK, val);
  90 }
  91
  92 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  93 {
  94         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  95         struct regmap *regmap = ldo->regmap;
  96         unsigned int val;
  97         int ret;
  98
  99         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
 100         if (ret != 0)
 101                 return ret;
 102
 103         if (val & ARIZONA_LDO1_HI_PWR)
 104                 return rdev->desc->n_voltages - 1;
 105
 106         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 107         if (ret != 0)
 108                 return ret;
 109
 110         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 111 }
 112
 113 static const struct regulator_ops arizona_ldo1_hc_ops = {
 114         .list_voltage = arizona_ldo1_hc_list_voltage,
 115         .map_voltage = arizona_ldo1_hc_map_voltage,
 116         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 117         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 118         .get_bypass = regulator_get_bypass_regmap,
 119         .set_bypass = regulator_set_bypass_regmap,
 120 };
 121
 122 static const struct regulator_desc arizona_ldo1_hc = {
 123         .name = "LDO1",
 124         .supply_name = "LDOVDD",
 125         .type = REGULATOR_VOLTAGE,
 126         .ops = &arizona_ldo1_hc_ops,
 127
 128         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 129         .bypass_mask = ARIZONA_LDO1_BYPASS,
 130         .min_uV = 900000,
 131         .uV_step = 50000,
 132         .n_voltages = 8,
 133         .enable_time = 1500,
 134         .ramp_delay = 24000,
 135
 136         .owner = THIS_MODULE,
 137 };
 138
 139 static const 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 };
 145
 146 static const struct regulator_desc arizona_ldo1 = {
 147         .name = "LDO1",
 148         .supply_name = "LDOVDD",
 149         .type = REGULATOR_VOLTAGE,
 150         .ops = &arizona_ldo1_ops,
 151
 152         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 153         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 154         .min_uV = 900000,
 155         .uV_step = 25000,
 156         .n_voltages = 13,
 157         .enable_time = 500,
 158         .ramp_delay = 24000,
 159
 160         .owner = THIS_MODULE,
 161 };
 162
 163 static const struct regulator_init_data arizona_ldo1_dvfs = {
 164         .constraints = {
 165                 .min_uV = 1200000,
 166                 .max_uV = 1800000,
 167                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 168                                   REGULATOR_CHANGE_VOLTAGE,
 169         },
 170         .num_consumer_supplies = 1,
 171 };
 172
 173 static const struct regulator_init_data arizona_ldo1_default = {
 174         .constraints = {
 175                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 176         },
 177         .num_consumer_supplies = 1,
 178 };
 179
 180 static const struct regulator_init_data arizona_ldo1_wm5110 = {
 181         .constraints = {
 182                 .min_uV = 1175000,
 183                 .max_uV = 1200000,
 184                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 185                                   REGULATOR_CHANGE_VOLTAGE,
 186         },
 187         .num_consumer_supplies = 1,
 188 };
 189
 190 static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
 191                                      struct regulator_config *config,
 192                                      const struct regulator_desc *desc,
 193                                      bool *external_dcvdd)
 194 {
 195         struct arizona_ldo1 *ldo1 = config->driver_data;
 196         struct device_node *np = config->dev->of_node;
 197         struct device_node *init_node, *dcvdd_node;
 198         struct regulator_init_data *init_data;
 199
 200         init_node = of_get_child_by_name(np, "ldo1");
 201         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
 202
 203         if (init_node) {
 204                 config->of_node = init_node;
 205
 206                 init_data = of_get_regulator_init_data(config->dev, init_node,
 207                                                        desc);
 208                 if (init_data) {
 209                         init_data->consumer_supplies = &ldo1->supply;
 210                         init_data->num_consumer_supplies = 1;
 211
 212                         if (dcvdd_node && dcvdd_node != init_node)
 213                                 *external_dcvdd = true;
 214
 215                         pdata->init_data = init_data;
 216                 }
 217         } else if (dcvdd_node) {
 218                 *external_dcvdd = true;
 219         }
 220
 221         of_node_put(dcvdd_node);
 222
 223         return 0;
 224 }
 225
 226 static int arizona_ldo1_common_init(struct platform_device *pdev,
 227                                     struct arizona_ldo1 *ldo1,
 228                                     const struct regulator_desc *desc,
 229                                     struct arizona_ldo1_pdata *pdata,
 230                                     bool *external_dcvdd)
 231 {
 232         struct device *parent_dev = pdev->dev.parent;
 233         struct regulator_config config = { };
 234         int ret;
 235
 236         *external_dcvdd = false;
 237
 238         ldo1->supply.supply = "DCVDD";
 239         ldo1->init_data.consumer_supplies = &ldo1->supply;
 240         ldo1->supply.dev_name = dev_name(parent_dev);
 241
 242         config.dev = parent_dev;
 243         config.driver_data = ldo1;
 244         config.regmap = ldo1->regmap;
 245
 246         if (IS_ENABLED(CONFIG_OF)) {
 247                 if (!dev_get_platdata(parent_dev)) {
 248                         ret = arizona_ldo1_of_get_pdata(pdata,
 249                                                         &config, desc,
 250                                                         external_dcvdd);
 251                         if (ret < 0)
 252                                 return ret;
 253                 }
 254         }
 255
 256         /* We assume that high output = regulator off */
 257         config.ena_gpiod = devm_gpiod_get_optional(&pdev->dev, "wlf,ldoena",
 258                                                    GPIOD_OUT_HIGH);
 259         if (IS_ERR(config.ena_gpiod))
 260                 return PTR_ERR(config.ena_gpiod);
 261
 262         if (pdata->init_data)
 263                 config.init_data = pdata->init_data;
 264         else
 265                 config.init_data = &ldo1->init_data;
 266
 267         /*
 268          * LDO1 can only be used to supply DCVDD so if it has no
 269          * consumers then DCVDD is supplied externally.
 270          */
 271         if (config.init_data->num_consumer_supplies == 0)
 272                 *external_dcvdd = true;
 273
 274         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 275
 276         of_node_put(config.of_node);
 277
 278         if (IS_ERR(ldo1->regulator)) {
 279                 ret = PTR_ERR(ldo1->regulator);
 280                 dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
 281                         ret);
 282                 return ret;
 283         }
 284
 285         platform_set_drvdata(pdev, ldo1);
 286
 287         return 0;
 288 }
 289
 290 static int arizona_ldo1_probe(struct platform_device *pdev)
 291 {
 292         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 293         struct arizona_ldo1 *ldo1;
 294         const struct regulator_desc *desc;
 295         bool external_dcvdd;
 296         int ret;
 297
 298         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 299         if (!ldo1)
 300                 return -ENOMEM;
 301
 302         ldo1->regmap = arizona->regmap;
 303
 304         /*
 305          * Since the chip usually supplies itself we provide some
 306          * default init_data for it.  This will be overridden with
 307          * platform data if provided.
 308          */
 309         switch (arizona->type) {
 310         case WM5102:
 311         case WM8997:
 312         case WM8998:
 313         case WM1814:
 314                 desc = &arizona_ldo1_hc;
 315                 ldo1->init_data = arizona_ldo1_dvfs;
 316                 break;
 317         case WM5110:
 318         case WM8280:
 319                 desc = &arizona_ldo1;
 320                 ldo1->init_data = arizona_ldo1_wm5110;
 321                 break;
 322         default:
 323                 desc = &arizona_ldo1;
 324                 ldo1->init_data = arizona_ldo1_default;
 325                 break;
 326         }
 327
 328         ret = arizona_ldo1_common_init(pdev, ldo1, desc,
 329                                        &arizona->pdata.ldo1,
 330                                        &external_dcvdd);
 331         if (ret == 0)
 332                 arizona->external_dcvdd = external_dcvdd;
 333
 334         return ret;
 335 }
 336
 337 static struct platform_driver arizona_ldo1_driver = {
 338         .probe = arizona_ldo1_probe,
 339         .driver         = {
 340                 .name   = "arizona-ldo1",
 341         },
 342 };
 343
 344 module_platform_driver(arizona_ldo1_driver);
 345
 346 /* Module information */
 347 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 348 MODULE_DESCRIPTION("Arizona LDO1 driver");
 349 MODULE_LICENSE("GPL");
 350 MODULE_ALIAS("platform:arizona-ldo1");