drivers/power/regulator/regulator-uclass.c

   1 /*
   2  * Copyright (C) 2014-2015 Samsung Electronics
   3  * Przemyslaw Marczak <p.marczak@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #include <common.h>
   8 #include <fdtdec.h>
   9 #include <errno.h>
  10 #include <dm.h>
  11 #include <dm/uclass-internal.h>
  12 #include <power/pmic.h>
  13 #include <power/regulator.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep)
  18 {
  19         struct dm_regulator_uclass_platdata *uc_pdata;
  20
  21         *modep = NULL;
  22
  23         uc_pdata = dev_get_uclass_platdata(dev);
  24         if (!uc_pdata)
  25                 return -ENXIO;
  26
  27         *modep = uc_pdata->mode;
  28         return uc_pdata->mode_count;
  29 }
  30
  31 int regulator_get_value(struct udevice *dev)
  32 {
  33         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  34
  35         if (!ops || !ops->get_value)
  36                 return -ENOSYS;
  37
  38         return ops->get_value(dev);
  39 }
  40
  41 int regulator_set_value(struct udevice *dev, int uV)
  42 {
  43         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  44
  45         if (!ops || !ops->set_value)
  46                 return -ENOSYS;
  47
  48         return ops->set_value(dev, uV);
  49 }
  50
  51 int regulator_get_current(struct udevice *dev)
  52 {
  53         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  54
  55         if (!ops || !ops->get_current)
  56                 return -ENOSYS;
  57
  58         return ops->get_current(dev);
  59 }
  60
  61 int regulator_set_current(struct udevice *dev, int uA)
  62 {
  63         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  64
  65         if (!ops || !ops->set_current)
  66                 return -ENOSYS;
  67
  68         return ops->set_current(dev, uA);
  69 }
  70
  71 bool regulator_get_enable(struct udevice *dev)
  72 {
  73         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  74
  75         if (!ops || !ops->get_enable)
  76                 return -ENOSYS;
  77
  78         return ops->get_enable(dev);
  79 }
  80
  81 int regulator_set_enable(struct udevice *dev, bool enable)
  82 {
  83         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  84
  85         if (!ops || !ops->set_enable)
  86                 return -ENOSYS;
  87
  88         return ops->set_enable(dev, enable);
  89 }
  90
  91 int regulator_get_mode(struct udevice *dev)
  92 {
  93         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
  94
  95         if (!ops || !ops->get_mode)
  96                 return -ENOSYS;
  97
  98         return ops->get_mode(dev);
  99 }
 100
 101 int regulator_set_mode(struct udevice *dev, int mode)
 102 {
 103         const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
 104
 105         if (!ops || !ops->set_mode)
 106                 return -ENOSYS;
 107
 108         return ops->set_mode(dev, mode);
 109 }
 110
 111 int regulator_get_by_platname(const char *plat_name, struct udevice **devp)
 112 {
 113         struct dm_regulator_uclass_platdata *uc_pdata;
 114         struct udevice *dev;
 115         int ret;
 116
 117         *devp = NULL;
 118
 119         for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
 120              ret = uclass_find_next_device(&dev)) {
 121                 if (ret)
 122                         continue;
 123
 124                 uc_pdata = dev_get_uclass_platdata(dev);
 125                 if (!uc_pdata || strcmp(plat_name, uc_pdata->name))
 126                         continue;
 127
 128                 return uclass_get_device_tail(dev, 0, devp);
 129         }
 130
 131         debug("%s: can't find: %s\n", __func__, plat_name);
 132
 133         return -ENODEV;
 134 }
 135
 136 int regulator_get_by_devname(const char *devname, struct udevice **devp)
 137 {
 138         return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp);
 139 }
 140
 141 static int failed(int ret, bool verbose, const char *fmt, ...)
 142 {
 143         va_list args;
 144         char buf[64];
 145
 146         if (verbose == false)
 147                 return ret;
 148
 149         va_start(args, fmt);
 150         vscnprintf(buf, sizeof(buf), fmt, args);
 151         va_end(args);
 152
 153         printf(buf);
 154
 155         if (!ret)
 156                 return 0;
 157
 158         printf(" (ret: %d)", ret);
 159
 160         return ret;
 161 }
 162
 163 int regulator_autoset(const char *platname,
 164                       struct udevice **devp,
 165                       bool verbose)
 166 {
 167         struct dm_regulator_uclass_platdata *uc_pdata;
 168         struct udevice *dev;
 169         int ret;
 170
 171         if (devp)
 172                 *devp = NULL;
 173
 174         ret = regulator_get_by_platname(platname, &dev);
 175         if (ret) {
 176                 error("Can get the regulator: %s!", platname);
 177                 return ret;
 178         }
 179
 180         uc_pdata = dev_get_uclass_platdata(dev);
 181         if (!uc_pdata) {
 182                 error("Can get the regulator %s uclass platdata!", platname);
 183                 return -ENXIO;
 184         }
 185
 186         if (!uc_pdata->always_on && !uc_pdata->boot_on)
 187                 goto retdev;
 188
 189         if (verbose)
 190                 printf("%s@%s: ", dev->name, uc_pdata->name);
 191
 192         /* Those values are optional (-ENODATA if unset) */
 193         if ((uc_pdata->min_uV != -ENODATA) &&
 194             (uc_pdata->max_uV != -ENODATA) &&
 195             (uc_pdata->min_uV == uc_pdata->max_uV)) {
 196                 ret = regulator_set_value(dev, uc_pdata->min_uV);
 197                 if (failed(ret, verbose, "set %d uV", uc_pdata->min_uV))
 198                         goto exit;
 199         }
 200
 201         /* Those values are optional (-ENODATA if unset) */
 202         if ((uc_pdata->min_uA != -ENODATA) &&
 203             (uc_pdata->max_uA != -ENODATA) &&
 204             (uc_pdata->min_uA == uc_pdata->max_uA)) {
 205                 ret = regulator_set_current(dev, uc_pdata->min_uA);
 206                 if (failed(ret, verbose, "; set %d uA", uc_pdata->min_uA))
 207                         goto exit;
 208         }
 209
 210         ret = regulator_set_enable(dev, true);
 211         if (failed(ret, verbose, "; enabling", uc_pdata->min_uA))
 212                 goto exit;
 213
 214 retdev:
 215         if (devp)
 216                 *devp = dev;
 217 exit:
 218         if (verbose)
 219                 printf("\n");
 220
 221         return ret;
 222 }
 223
 224 int regulator_list_autoset(const char *list_platname[],
 225                            struct udevice *list_devp[],
 226                            bool verbose)
 227 {
 228         struct udevice *dev;
 229         int error = 0, i = 0, ret;
 230
 231         while (list_platname[i]) {
 232                 ret = regulator_autoset(list_platname[i], &dev, verbose);
 233                 if (ret & !error)
 234                         error = ret;
 235
 236                 if (list_devp)
 237                         list_devp[i] = dev;
 238
 239                 i++;
 240         }
 241
 242         return error;
 243 }
 244
 245 static bool regulator_name_is_unique(struct udevice *check_dev,
 246                                      const char *check_name)
 247 {
 248         struct dm_regulator_uclass_platdata *uc_pdata;
 249         struct udevice *dev;
 250         int check_len = strlen(check_name);
 251         int ret;
 252         int len;
 253
 254         for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
 255              ret = uclass_find_next_device(&dev)) {
 256                 if (ret || dev == check_dev)
 257                         continue;
 258
 259                 uc_pdata = dev_get_uclass_platdata(dev);
 260                 len = strlen(uc_pdata->name);
 261                 if (len != check_len)
 262                         continue;
 263
 264                 if (!strcmp(uc_pdata->name, check_name))
 265                         return false;
 266         }
 267
 268         return true;
 269 }
 270
 271 static int regulator_post_bind(struct udevice *dev)
 272 {
 273         struct dm_regulator_uclass_platdata *uc_pdata;
 274         int offset = dev->of_offset;
 275         const void *blob = gd->fdt_blob;
 276         const char *property = "regulator-name";
 277
 278         uc_pdata = dev_get_uclass_platdata(dev);
 279         if (!uc_pdata)
 280                 return -ENXIO;
 281
 282         /* Regulator's mandatory constraint */
 283         uc_pdata->name = fdt_getprop(blob, offset, property, NULL);
 284         if (!uc_pdata->name) {
 285                 debug("%s: dev: %s has no property 'regulator-name'\n",
 286                       __func__, dev->name);
 287                 return -EINVAL;
 288         }
 289
 290         if (regulator_name_is_unique(dev, uc_pdata->name))
 291                 return 0;
 292
 293         error("\"%s\" of dev: \"%s\", has nonunique value: \"%s\"",
 294               property, dev->name, uc_pdata->name);
 295
 296         return -EINVAL;
 297 }
 298
 299 static int regulator_pre_probe(struct udevice *dev)
 300 {
 301         struct dm_regulator_uclass_platdata *uc_pdata;
 302         int offset = dev->of_offset;
 303
 304         uc_pdata = dev_get_uclass_platdata(dev);
 305         if (!uc_pdata)
 306                 return -ENXIO;
 307
 308         /* Regulator's optional constraints */
 309         uc_pdata->min_uV = fdtdec_get_int(gd->fdt_blob, offset,
 310                                           "regulator-min-microvolt", -ENODATA);
 311         uc_pdata->max_uV = fdtdec_get_int(gd->fdt_blob, offset,
 312                                           "regulator-max-microvolt", -ENODATA);
 313         uc_pdata->min_uA = fdtdec_get_int(gd->fdt_blob, offset,
 314                                           "regulator-min-microamp", -ENODATA);
 315         uc_pdata->max_uA = fdtdec_get_int(gd->fdt_blob, offset,
 316                                           "regulator-max-microamp", -ENODATA);
 317         uc_pdata->always_on = fdtdec_get_bool(gd->fdt_blob, offset,
 318                                               "regulator-always-on");
 319         uc_pdata->boot_on = fdtdec_get_bool(gd->fdt_blob, offset,
 320                                             "regulator-boot-on");
 321
 322         return 0;
 323 }
 324
 325 UCLASS_DRIVER(regulator) = {
 326         .id             = UCLASS_REGULATOR,
 327         .name           = "regulator",
 328         .post_bind      = regulator_post_bind,
 329         .pre_probe      = regulator_pre_probe,
 330         .per_device_platdata_auto_alloc_size =
 331                                 sizeof(struct dm_regulator_uclass_platdata),
 332 };