1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2014-2015 Samsung Electronics 4 * Przemyslaw Marczak <p.marczak@samsung.com> 5 */ 6 7#define LOG_CATEGORY UCLASS_REGULATOR 8 9#include <common.h> 10#include <errno.h> 11#include <dm.h> 12#include <log.h> 13#include <dm/uclass-internal.h> 14#include <linux/delay.h> 15#include <power/pmic.h> 16#include <power/regulator.h> 17 18int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep) 19{ 20 struct dm_regulator_uclass_plat *uc_pdata; 21 22 *modep = NULL; 23 24 uc_pdata = dev_get_uclass_plat(dev); 25 if (!uc_pdata) 26 return -ENXIO; 27 28 *modep = uc_pdata->mode; 29 return uc_pdata->mode_count; 30} 31 32int regulator_get_value(struct udevice *dev) 33{ 34 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 35 36 if (!ops || !ops->get_value) 37 return -ENOSYS; 38 39 return ops->get_value(dev); 40} 41 42static void regulator_set_value_ramp_delay(struct udevice *dev, int old_uV, 43 int new_uV, unsigned int ramp_delay) 44{ 45 int delay = DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay); 46 47 debug("regulator %s: delay %u us (%d uV -> %d uV)\n", dev->name, delay, 48 old_uV, new_uV); 49 50 udelay(delay); 51} 52 53int regulator_set_value(struct udevice *dev, int uV) 54{ 55 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 56 struct dm_regulator_uclass_plat *uc_pdata; 57 int ret, old_uV = uV, is_enabled = 0; 58 59 uc_pdata = dev_get_uclass_plat(dev); 60 if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV) 61 return -EINVAL; 62 if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV) 63 return -EINVAL; 64 65 if (!ops || !ops->set_value) 66 return -ENOSYS; 67 68 if (uc_pdata->ramp_delay) { 69 is_enabled = regulator_get_enable(dev); 70 old_uV = regulator_get_value(dev); 71 } 72 73 ret = ops->set_value(dev, uV); 74 75 if (!ret) { 76 if (uc_pdata->ramp_delay && old_uV > 0 && is_enabled) 77 regulator_set_value_ramp_delay(dev, old_uV, uV, 78 uc_pdata->ramp_delay); 79 } 80 81 return ret; 82} 83 84int regulator_set_suspend_value(struct udevice *dev, int uV) 85{ 86 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 87 struct dm_regulator_uclass_plat *uc_pdata; 88 89 uc_pdata = dev_get_uclass_plat(dev); 90 if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV) 91 return -EINVAL; 92 if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV) 93 return -EINVAL; 94 95 if (!ops->set_suspend_value) 96 return -ENOSYS; 97 98 return ops->set_suspend_value(dev, uV); 99} 100 101int regulator_get_suspend_value(struct udevice *dev) 102{ 103 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 104 105 if (!ops->get_suspend_value) 106 return -ENOSYS; 107 108 return ops->get_suspend_value(dev); 109} 110 111/* 112 * To be called with at most caution as there is no check 113 * before setting the actual voltage value. 114 */ 115int regulator_set_value_force(struct udevice *dev, int uV) 116{ 117 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 118 119 if (!ops || !ops->set_value) 120 return -ENOSYS; 121 122 return ops->set_value(dev, uV); 123} 124 125int regulator_get_current(struct udevice *dev) 126{ 127 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 128 129 if (!ops || !ops->get_current) 130 return -ENOSYS; 131 132 return ops->get_current(dev); 133} 134 135int regulator_set_current(struct udevice *dev, int uA) 136{ 137 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 138 struct dm_regulator_uclass_plat *uc_pdata; 139 140 uc_pdata = dev_get_uclass_plat(dev); 141 if (uc_pdata->min_uA != -ENODATA && uA < uc_pdata->min_uA) 142 return -EINVAL; 143 if (uc_pdata->max_uA != -ENODATA && uA > uc_pdata->max_uA) 144 return -EINVAL; 145 146 if (!ops || !ops->set_current) 147 return -ENOSYS; 148 149 return ops->set_current(dev, uA); 150} 151 152int regulator_get_enable(struct udevice *dev) 153{ 154 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 155 156 if (!ops || !ops->get_enable) 157 return -ENOSYS; 158 159 return ops->get_enable(dev); 160} 161 162int regulator_set_enable(struct udevice *dev, bool enable) 163{ 164 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 165 struct dm_regulator_uclass_plat *uc_pdata; 166 int ret, old_enable = 0; 167 168 if (!ops || !ops->set_enable) 169 return -ENOSYS; 170 171 uc_pdata = dev_get_uclass_plat(dev); 172 if (!enable && uc_pdata->always_on) 173 return -EACCES; 174 175 if (uc_pdata->ramp_delay) 176 old_enable = regulator_get_enable(dev); 177 178 ret = ops->set_enable(dev, enable); 179 if (!ret) { 180 if (uc_pdata->ramp_delay && !old_enable && enable) { 181 int uV = regulator_get_value(dev); 182 183 if (uV > 0) { 184 regulator_set_value_ramp_delay(dev, 0, uV, 185 uc_pdata->ramp_delay); 186 } 187 } 188 } 189 190 return ret; 191} 192 193int regulator_set_enable_if_allowed(struct udevice *dev, bool enable) 194{ 195 int ret; 196 197 ret = regulator_set_enable(dev, enable); 198 if (ret == -ENOSYS || ret == -EACCES) 199 return 0; 200 /* if we want to disable but it's in use by someone else */ 201 if (!enable && ret == -EBUSY) 202 return 0; 203 /* if it's already enabled/disabled */ 204 if (ret == -EALREADY) 205 return 0; 206 207 return ret; 208} 209 210int regulator_set_suspend_enable(struct udevice *dev, bool enable) 211{ 212 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 213 214 if (!ops->set_suspend_enable) 215 return -ENOSYS; 216 217 return ops->set_suspend_enable(dev, enable); 218} 219 220int regulator_get_suspend_enable(struct udevice *dev) 221{ 222 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 223 224 if (!ops->get_suspend_enable) 225 return -ENOSYS; 226 227 return ops->get_suspend_enable(dev); 228} 229 230int regulator_get_mode(struct udevice *dev) 231{ 232 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 233 234 if (!ops || !ops->get_mode) 235 return -ENOSYS; 236 237 return ops->get_mode(dev); 238} 239 240int regulator_set_mode(struct udevice *dev, int mode) 241{ 242 const struct dm_regulator_ops *ops = dev_get_driver_ops(dev); 243 244 if (!ops || !ops->set_mode) 245 return -ENOSYS; 246 247 return ops->set_mode(dev, mode); 248} 249 250int regulator_get_by_platname(const char *plat_name, struct udevice **devp) 251{ 252 struct dm_regulator_uclass_plat *uc_pdata; 253 struct udevice *dev; 254 int ret; 255 256 *devp = NULL; 257 258 for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev; 259 ret = uclass_find_next_device(&dev)) { 260 if (ret) { 261 debug("regulator %s, ret=%d\n", dev->name, ret); 262 continue; 263 } 264 265 uc_pdata = dev_get_uclass_plat(dev); 266 if (!uc_pdata || strcmp(plat_name, uc_pdata->name)) 267 continue; 268 269 return uclass_get_device_tail(dev, 0, devp); 270 } 271 272 debug("%s: can't find: %s, ret=%d\n", __func__, plat_name, ret); 273 274 return -ENODEV; 275} 276 277int regulator_get_by_devname(const char *devname, struct udevice **devp) 278{ 279 return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp); 280} 281 282int device_get_supply_regulator(struct udevice *dev, const char *supply_name, 283 struct udevice **devp) 284{ 285 return uclass_get_device_by_phandle(UCLASS_REGULATOR, dev, 286 supply_name, devp); 287} 288 289int regulator_autoset(struct udevice *dev) 290{ 291 struct dm_regulator_uclass_plat *uc_pdata; 292 int ret = 0; 293 294 uc_pdata = dev_get_uclass_plat(dev); 295 296 if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_DONE) 297 return -EALREADY; 298 299 ret = regulator_set_suspend_enable(dev, uc_pdata->suspend_on); 300 if (ret == -ENOSYS) 301 ret = 0; 302 303 if (!ret && uc_pdata->suspend_on) { 304 ret = regulator_set_suspend_value(dev, uc_pdata->suspend_uV); 305 if (ret == -ENOSYS) 306 ret = 0; 307 308 if (ret) 309 return ret; 310 } 311 312 if (!uc_pdata->always_on && !uc_pdata->boot_on) { 313 ret = -EMEDIUMTYPE; 314 goto out; 315 } 316 317 if (uc_pdata->type == REGULATOR_TYPE_FIXED) { 318 ret = regulator_set_enable(dev, true); 319 goto out; 320 } 321 322 if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV) 323 ret = regulator_set_value(dev, uc_pdata->min_uV); 324 if (uc_pdata->init_uV > 0) 325 ret = regulator_set_value(dev, uc_pdata->init_uV); 326 if (!ret && (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA)) 327 ret = regulator_set_current(dev, uc_pdata->min_uA); 328 329 if (!ret) 330 ret = regulator_set_enable(dev, true); 331 332out: 333 uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_DONE; 334 335 return ret; 336} 337 338int regulator_unset(struct udevice *dev) 339{ 340 struct dm_regulator_uclass_plat *uc_pdata; 341 342 uc_pdata = dev_get_uclass_plat(dev); 343 if (uc_pdata && uc_pdata->force_off) 344 return regulator_set_enable(dev, false); 345 346 return -EMEDIUMTYPE; 347} 348 349static void regulator_show(struct udevice *dev, int ret) 350{ 351 struct dm_regulator_uclass_plat *uc_pdata; 352 353 uc_pdata = dev_get_uclass_plat(dev); 354 355 printf("%s@%s: ", dev->name, uc_pdata->name); 356 if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV) 357 printf("set %d uV", uc_pdata->min_uV); 358 if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA) 359 printf("; set %d uA", uc_pdata->min_uA); 360 printf("; enabling"); 361 if (ret) 362 printf(" (ret: %d)", ret); 363 printf("\n"); 364} 365 366int regulator_autoset_by_name(const char *platname, struct udevice **devp) 367{ 368 struct udevice *dev; 369 int ret; 370 371 ret = regulator_get_by_platname(platname, &dev); 372 if (devp) 373 *devp = dev; 374 if (ret) { 375 debug("Can get the regulator: %s (err=%d)\n", platname, ret); 376 return ret; 377 } 378 379 return regulator_autoset(dev); 380} 381 382int regulator_list_autoset(const char *list_platname[], 383 struct udevice *list_devp[], 384 bool verbose) 385{ 386 struct udevice *dev; 387 int error = 0, i = 0, ret; 388 389 while (list_platname[i]) { 390 ret = regulator_autoset_by_name(list_platname[i], &dev); 391 if (ret != -EMEDIUMTYPE && verbose) 392 regulator_show(dev, ret); 393 if (ret & !error) 394 error = ret; 395 396 if (list_devp) 397 list_devp[i] = dev; 398 399 i++; 400 } 401 402 return error; 403} 404 405static bool regulator_name_is_unique(struct udevice *check_dev, 406 const char *check_name) 407{ 408 struct dm_regulator_uclass_plat *uc_pdata; 409 struct udevice *dev; 410 int check_len = strlen(check_name); 411 int ret; 412 int len; 413 414 for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev; 415 ret = uclass_find_next_device(&dev)) { 416 if (ret || dev == check_dev) 417 continue; 418 419 uc_pdata = dev_get_uclass_plat(dev); 420 len = strlen(uc_pdata->name); 421 if (len != check_len) 422 continue; 423 424 if (!strcmp(uc_pdata->name, check_name)) 425 return false; 426 } 427 428 return true; 429} 430 431static int regulator_post_bind(struct udevice *dev) 432{ 433 struct dm_regulator_uclass_plat *uc_pdata; 434 const char *property = "regulator-name"; 435 436 uc_pdata = dev_get_uclass_plat(dev); 437 438 /* Regulator's mandatory constraint */ 439 uc_pdata->name = dev_read_string(dev, property); 440 if (!uc_pdata->name) { 441 debug("%s: dev '%s' has no property '%s'\n", 442 __func__, dev->name, property); 443 uc_pdata->name = dev_read_name(dev); 444 if (!uc_pdata->name) 445 return -EINVAL; 446 } 447 448 if (regulator_name_is_unique(dev, uc_pdata->name)) 449 return 0; 450 451 debug("'%s' of dev: '%s', has nonunique value: '%s\n", 452 property, dev->name, uc_pdata->name); 453 454 return -EINVAL; 455} 456 457static int regulator_pre_probe(struct udevice *dev) 458{ 459 struct dm_regulator_uclass_plat *uc_pdata; 460 ofnode node; 461 462 uc_pdata = dev_get_uclass_plat(dev); 463 if (!uc_pdata) 464 return -ENXIO; 465 466 /* Regulator's optional constraints */ 467 uc_pdata->min_uV = dev_read_u32_default(dev, "regulator-min-microvolt", 468 -ENODATA); 469 uc_pdata->max_uV = dev_read_u32_default(dev, "regulator-max-microvolt", 470 -ENODATA); 471 uc_pdata->init_uV = dev_read_u32_default(dev, "regulator-init-microvolt", 472 -ENODATA); 473 uc_pdata->min_uA = dev_read_u32_default(dev, "regulator-min-microamp", 474 -ENODATA); 475 uc_pdata->max_uA = dev_read_u32_default(dev, "regulator-max-microamp", 476 -ENODATA); 477 uc_pdata->always_on = dev_read_bool(dev, "regulator-always-on"); 478 uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on"); 479 uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay", 480 0); 481 uc_pdata->force_off = dev_read_bool(dev, "regulator-force-boot-off"); 482 483 node = dev_read_subnode(dev, "regulator-state-mem"); 484 if (ofnode_valid(node)) { 485 uc_pdata->suspend_on = !ofnode_read_bool(node, "regulator-off-in-suspend"); 486 if (ofnode_read_u32(node, "regulator-suspend-microvolt", &uc_pdata->suspend_uV)) 487 uc_pdata->suspend_uV = uc_pdata->max_uV; 488 } else { 489 uc_pdata->suspend_on = true; 490 uc_pdata->suspend_uV = uc_pdata->max_uV; 491 } 492 493 /* Those values are optional (-ENODATA if unset) */ 494 if ((uc_pdata->min_uV != -ENODATA) && 495 (uc_pdata->max_uV != -ENODATA) && 496 (uc_pdata->min_uV == uc_pdata->max_uV)) 497 uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UV; 498 499 /* Those values are optional (-ENODATA if unset) */ 500 if ((uc_pdata->min_uA != -ENODATA) && 501 (uc_pdata->max_uA != -ENODATA) && 502 (uc_pdata->min_uA == uc_pdata->max_uA)) 503 uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UA; 504 505 return 0; 506} 507 508int regulators_enable_boot_on(bool verbose) 509{ 510 struct udevice *dev; 511 struct uclass *uc; 512 int ret; 513 514 ret = uclass_get(UCLASS_REGULATOR, &uc); 515 if (ret) 516 return ret; 517 for (uclass_first_device(UCLASS_REGULATOR, &dev); 518 dev; 519 uclass_next_device(&dev)) { 520 ret = regulator_autoset(dev); 521 if (ret == -EMEDIUMTYPE) { 522 ret = 0; 523 continue; 524 } 525 if (verbose) 526 regulator_show(dev, ret); 527 if (ret == -ENOSYS) 528 ret = 0; 529 } 530 531 return ret; 532} 533 534int regulators_enable_boot_off(bool verbose) 535{ 536 struct udevice *dev; 537 struct uclass *uc; 538 int ret; 539 540 ret = uclass_get(UCLASS_REGULATOR, &uc); 541 if (ret) 542 return ret; 543 for (uclass_first_device(UCLASS_REGULATOR, &dev); 544 dev; 545 uclass_next_device(&dev)) { 546 ret = regulator_unset(dev); 547 if (ret == -EMEDIUMTYPE) { 548 ret = 0; 549 continue; 550 } 551 if (verbose) 552 regulator_show(dev, ret); 553 if (ret == -ENOSYS) 554 ret = 0; 555 } 556 557 return ret; 558} 559 560UCLASS_DRIVER(regulator) = { 561 .id = UCLASS_REGULATOR, 562 .name = "regulator", 563 .post_bind = regulator_post_bind, 564 .pre_probe = regulator_pre_probe, 565 .per_device_plat_auto = sizeof(struct dm_regulator_uclass_plat), 566}; 567