1// SPDX-License-Identifier: GPL-2.0 2/* 3 * RTC driver for the Micro Crystal RV8803 4 * 5 * Copyright (C) 2015 Micro Crystal SA 6 * Alexandre Belloni <alexandre.belloni@bootlin.com> 7 * 8 */ 9 10#include <linux/bcd.h> 11#include <linux/bitops.h> 12#include <linux/bitfield.h> 13#include <linux/log2.h> 14#include <linux/i2c.h> 15#include <linux/interrupt.h> 16#include <linux/kernel.h> 17#include <linux/module.h> 18#include <linux/of.h> 19#include <linux/rtc.h> 20#include <linux/pm_wakeirq.h> 21 22#define RV8803_I2C_TRY_COUNT 4 23 24#define RV8803_SEC 0x00 25#define RV8803_MIN 0x01 26#define RV8803_HOUR 0x02 27#define RV8803_WEEK 0x03 28#define RV8803_DAY 0x04 29#define RV8803_MONTH 0x05 30#define RV8803_YEAR 0x06 31#define RV8803_RAM 0x07 32#define RV8803_ALARM_MIN 0x08 33#define RV8803_ALARM_HOUR 0x09 34#define RV8803_ALARM_WEEK_OR_DAY 0x0A 35#define RV8803_EXT 0x0D 36#define RV8803_FLAG 0x0E 37#define RV8803_CTRL 0x0F 38#define RV8803_OSC_OFFSET 0x2C 39 40#define RV8803_EXT_WADA BIT(6) 41 42#define RV8803_FLAG_V1F BIT(0) 43#define RV8803_FLAG_V2F BIT(1) 44#define RV8803_FLAG_AF BIT(3) 45#define RV8803_FLAG_TF BIT(4) 46#define RV8803_FLAG_UF BIT(5) 47 48#define RV8803_CTRL_RESET BIT(0) 49 50#define RV8803_CTRL_EIE BIT(2) 51#define RV8803_CTRL_AIE BIT(3) 52#define RV8803_CTRL_TIE BIT(4) 53#define RV8803_CTRL_UIE BIT(5) 54 55#define RX8803_CTRL_CSEL GENMASK(7, 6) 56 57#define RX8900_BACKUP_CTRL 0x18 58#define RX8900_FLAG_SWOFF BIT(2) 59#define RX8900_FLAG_VDETOFF BIT(3) 60 61enum rv8803_type { 62 rv_8803, 63 rx_8803, 64 rx_8804, 65 rx_8900 66}; 67 68struct rv8803_data { 69 struct i2c_client *client; 70 struct rtc_device *rtc; 71 struct mutex flags_lock; 72 u8 ctrl; 73 u8 backup; 74 u8 alarm_invalid:1; 75 enum rv8803_type type; 76}; 77 78static int rv8803_read_reg(const struct i2c_client *client, u8 reg) 79{ 80 int try = RV8803_I2C_TRY_COUNT; 81 s32 ret; 82 83 /* 84 * There is a 61��s window during which the RTC does not acknowledge I2C 85 * transfers. In that case, ensure that there are multiple attempts. 86 */ 87 do 88 ret = i2c_smbus_read_byte_data(client, reg); 89 while ((ret == -ENXIO || ret == -EIO) && --try); 90 if (ret < 0) 91 dev_err(&client->dev, "Unable to read register 0x%02x\n", reg); 92 93 return ret; 94} 95 96static int rv8803_read_regs(const struct i2c_client *client, 97 u8 reg, u8 count, u8 *values) 98{ 99 int try = RV8803_I2C_TRY_COUNT; 100 s32 ret; 101 102 do 103 ret = i2c_smbus_read_i2c_block_data(client, reg, count, values); 104 while ((ret == -ENXIO || ret == -EIO) && --try); 105 if (ret != count) { 106 dev_err(&client->dev, 107 "Unable to read registers 0x%02x..0x%02x\n", 108 reg, reg + count - 1); 109 return ret < 0 ? ret : -EIO; 110 } 111 112 return 0; 113} 114 115static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value) 116{ 117 int try = RV8803_I2C_TRY_COUNT; 118 s32 ret; 119 120 do 121 ret = i2c_smbus_write_byte_data(client, reg, value); 122 while ((ret == -ENXIO || ret == -EIO) && --try); 123 if (ret) 124 dev_err(&client->dev, "Unable to write register 0x%02x\n", reg); 125 126 return ret; 127} 128 129static int rv8803_write_regs(const struct i2c_client *client, 130 u8 reg, u8 count, const u8 *values) 131{ 132 int try = RV8803_I2C_TRY_COUNT; 133 s32 ret; 134 135 do 136 ret = i2c_smbus_write_i2c_block_data(client, reg, count, 137 values); 138 while ((ret == -ENXIO || ret == -EIO) && --try); 139 if (ret) 140 dev_err(&client->dev, 141 "Unable to write registers 0x%02x..0x%02x\n", 142 reg, reg + count - 1); 143 144 return ret; 145} 146 147static int rv8803_regs_init(struct rv8803_data *rv8803) 148{ 149 int ret; 150 151 ret = rv8803_write_reg(rv8803->client, RV8803_OSC_OFFSET, 0x00); 152 if (ret) 153 return ret; 154 155 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, 156 FIELD_PREP(RX8803_CTRL_CSEL, 1)); /* 2s */ 157 if (ret) 158 return ret; 159 160 ret = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, 161 (u8[]){ 0, 0, 0 }); 162 if (ret) 163 return ret; 164 165 return rv8803_write_reg(rv8803->client, RV8803_RAM, 0x00); 166} 167 168static int rv8803_regs_configure(struct rv8803_data *rv8803); 169 170static int rv8803_regs_reset(struct rv8803_data *rv8803, bool full) 171{ 172 /* 173 * The RV-8803 resets all registers to POR defaults after voltage-loss, 174 * the Epson RTCs don't, so we manually reset the remainder here. 175 */ 176 if (full || rv8803->type == rx_8803 || rv8803->type == rx_8900) { 177 int ret = rv8803_regs_init(rv8803); 178 if (ret) 179 return ret; 180 } 181 182 return rv8803_regs_configure(rv8803); 183} 184 185static irqreturn_t rv8803_handle_irq(int irq, void *dev_id) 186{ 187 struct i2c_client *client = dev_id; 188 struct rv8803_data *rv8803 = i2c_get_clientdata(client); 189 unsigned long events = 0; 190 int flags; 191 192 mutex_lock(&rv8803->flags_lock); 193 194 flags = rv8803_read_reg(client, RV8803_FLAG); 195 if (flags <= 0) { 196 mutex_unlock(&rv8803->flags_lock); 197 return IRQ_NONE; 198 } 199 200 if (flags & RV8803_FLAG_V1F) 201 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); 202 203 if (flags & RV8803_FLAG_V2F) 204 dev_warn(&client->dev, "Voltage low, data loss detected.\n"); 205 206 if (flags & RV8803_FLAG_TF) { 207 flags &= ~RV8803_FLAG_TF; 208 rv8803->ctrl &= ~RV8803_CTRL_TIE; 209 events |= RTC_PF; 210 } 211 212 if (flags & RV8803_FLAG_AF) { 213 flags &= ~RV8803_FLAG_AF; 214 rv8803->ctrl &= ~RV8803_CTRL_AIE; 215 events |= RTC_AF; 216 } 217 218 if (flags & RV8803_FLAG_UF) { 219 flags &= ~RV8803_FLAG_UF; 220 rv8803->ctrl &= ~RV8803_CTRL_UIE; 221 events |= RTC_UF; 222 } 223 224 if (events) { 225 rtc_update_irq(rv8803->rtc, 1, events); 226 rv8803_write_reg(client, RV8803_FLAG, flags); 227 rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl); 228 } 229 230 mutex_unlock(&rv8803->flags_lock); 231 232 return IRQ_HANDLED; 233} 234 235static int rv8803_get_time(struct device *dev, struct rtc_time *tm) 236{ 237 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 238 u8 date1[7]; 239 u8 date2[7]; 240 u8 *date = date1; 241 int ret, flags; 242 243 if (rv8803->alarm_invalid) { 244 dev_warn(dev, "Corruption detected, data may be invalid.\n"); 245 return -EINVAL; 246 } 247 248 flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); 249 if (flags < 0) 250 return flags; 251 252 if (flags & RV8803_FLAG_V2F) { 253 dev_warn(dev, "Voltage low, data is invalid.\n"); 254 return -EINVAL; 255 } 256 257 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date); 258 if (ret) 259 return ret; 260 261 if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) { 262 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2); 263 if (ret) 264 return ret; 265 266 if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59)) 267 date = date2; 268 } 269 270 tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f); 271 tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f); 272 tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f); 273 tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f); 274 tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f); 275 tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1; 276 tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100; 277 278 return 0; 279} 280 281static int rv8803_set_time(struct device *dev, struct rtc_time *tm) 282{ 283 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 284 u8 date[7]; 285 int ctrl, flags, ret; 286 287 ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL); 288 if (ctrl < 0) 289 return ctrl; 290 291 /* Stop the clock */ 292 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, 293 ctrl | RV8803_CTRL_RESET); 294 if (ret) 295 return ret; 296 297 date[RV8803_SEC] = bin2bcd(tm->tm_sec); 298 date[RV8803_MIN] = bin2bcd(tm->tm_min); 299 date[RV8803_HOUR] = bin2bcd(tm->tm_hour); 300 date[RV8803_WEEK] = 1 << (tm->tm_wday); 301 date[RV8803_DAY] = bin2bcd(tm->tm_mday); 302 date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1); 303 date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100); 304 305 ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date); 306 if (ret) 307 return ret; 308 309 /* Restart the clock */ 310 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, 311 ctrl & ~RV8803_CTRL_RESET); 312 if (ret) 313 return ret; 314 315 mutex_lock(&rv8803->flags_lock); 316 317 flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); 318 if (flags < 0) { 319 mutex_unlock(&rv8803->flags_lock); 320 return flags; 321 } 322 323 if ((flags & RV8803_FLAG_V2F) || rv8803->alarm_invalid) { 324 /* 325 * If we sense corruption in the alarm registers, but see no 326 * voltage loss flag, we can't rely on other registers having 327 * sensible values. Reset them fully. 328 */ 329 ret = rv8803_regs_reset(rv8803, rv8803->alarm_invalid); 330 if (ret) { 331 mutex_unlock(&rv8803->flags_lock); 332 return ret; 333 } 334 335 rv8803->alarm_invalid = false; 336 } 337 338 ret = rv8803_write_reg(rv8803->client, RV8803_FLAG, 339 flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F)); 340 341 mutex_unlock(&rv8803->flags_lock); 342 343 return ret; 344} 345 346static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) 347{ 348 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 349 struct i2c_client *client = rv8803->client; 350 u8 alarmvals[3]; 351 int flags, ret; 352 353 ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals); 354 if (ret) 355 return ret; 356 357 flags = rv8803_read_reg(client, RV8803_FLAG); 358 if (flags < 0) 359 return flags; 360 361 alarmvals[0] &= 0x7f; 362 alarmvals[1] &= 0x3f; 363 alarmvals[2] &= 0x3f; 364 365 if (!bcd_is_valid(alarmvals[0]) || 366 !bcd_is_valid(alarmvals[1]) || 367 !bcd_is_valid(alarmvals[2])) 368 goto err_invalid; 369 370 alrm->time.tm_sec = 0; 371 alrm->time.tm_min = bcd2bin(alarmvals[0]); 372 alrm->time.tm_hour = bcd2bin(alarmvals[1]); 373 alrm->time.tm_mday = bcd2bin(alarmvals[2]); 374 375 alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE); 376 alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled; 377 378 if ((unsigned int)alrm->time.tm_mday > 31 || 379 (unsigned int)alrm->time.tm_hour >= 24 || 380 (unsigned int)alrm->time.tm_min >= 60) 381 goto err_invalid; 382 383 return 0; 384 385err_invalid: 386 rv8803->alarm_invalid = true; 387 return -EINVAL; 388} 389 390static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 391{ 392 struct i2c_client *client = to_i2c_client(dev); 393 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 394 u8 alarmvals[3]; 395 u8 ctrl[2]; 396 int ret, err; 397 398 /* The alarm has no seconds, round up to nearest minute */ 399 if (alrm->time.tm_sec) { 400 time64_t alarm_time = rtc_tm_to_time64(&alrm->time); 401 402 alarm_time += 60 - alrm->time.tm_sec; 403 rtc_time64_to_tm(alarm_time, &alrm->time); 404 } 405 406 mutex_lock(&rv8803->flags_lock); 407 408 ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl); 409 if (ret) { 410 mutex_unlock(&rv8803->flags_lock); 411 return ret; 412 } 413 414 alarmvals[0] = bin2bcd(alrm->time.tm_min); 415 alarmvals[1] = bin2bcd(alrm->time.tm_hour); 416 alarmvals[2] = bin2bcd(alrm->time.tm_mday); 417 418 if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) { 419 rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE); 420 err = rv8803_write_reg(rv8803->client, RV8803_CTRL, 421 rv8803->ctrl); 422 if (err) { 423 mutex_unlock(&rv8803->flags_lock); 424 return err; 425 } 426 } 427 428 ctrl[0] &= ~RV8803_FLAG_AF; 429 err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[0]); 430 mutex_unlock(&rv8803->flags_lock); 431 if (err) 432 return err; 433 434 err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals); 435 if (err) 436 return err; 437 438 if (alrm->enabled) { 439 if (rv8803->rtc->uie_rtctimer.enabled) 440 rv8803->ctrl |= RV8803_CTRL_UIE; 441 if (rv8803->rtc->aie_timer.enabled) 442 rv8803->ctrl |= RV8803_CTRL_AIE; 443 444 err = rv8803_write_reg(rv8803->client, RV8803_CTRL, 445 rv8803->ctrl); 446 if (err) 447 return err; 448 } 449 450 return 0; 451} 452 453static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled) 454{ 455 struct i2c_client *client = to_i2c_client(dev); 456 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 457 int ctrl, flags, err; 458 459 ctrl = rv8803->ctrl; 460 461 if (enabled) { 462 if (rv8803->rtc->uie_rtctimer.enabled) 463 ctrl |= RV8803_CTRL_UIE; 464 if (rv8803->rtc->aie_timer.enabled) 465 ctrl |= RV8803_CTRL_AIE; 466 } else { 467 if (!rv8803->rtc->uie_rtctimer.enabled) 468 ctrl &= ~RV8803_CTRL_UIE; 469 if (!rv8803->rtc->aie_timer.enabled) 470 ctrl &= ~RV8803_CTRL_AIE; 471 } 472 473 mutex_lock(&rv8803->flags_lock); 474 flags = rv8803_read_reg(client, RV8803_FLAG); 475 if (flags < 0) { 476 mutex_unlock(&rv8803->flags_lock); 477 return flags; 478 } 479 flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF); 480 err = rv8803_write_reg(client, RV8803_FLAG, flags); 481 mutex_unlock(&rv8803->flags_lock); 482 if (err) 483 return err; 484 485 if (ctrl != rv8803->ctrl) { 486 rv8803->ctrl = ctrl; 487 err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl); 488 if (err) 489 return err; 490 } 491 492 return 0; 493} 494 495static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 496{ 497 struct i2c_client *client = to_i2c_client(dev); 498 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 499 unsigned int vl = 0; 500 int flags, ret = 0; 501 502 switch (cmd) { 503 case RTC_VL_READ: 504 flags = rv8803_read_reg(client, RV8803_FLAG); 505 if (flags < 0) 506 return flags; 507 508 if (flags & RV8803_FLAG_V1F) { 509 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); 510 vl = RTC_VL_ACCURACY_LOW; 511 } 512 513 if (flags & RV8803_FLAG_V2F) 514 vl |= RTC_VL_DATA_INVALID; 515 516 return put_user(vl, (unsigned int __user *)arg); 517 518 case RTC_VL_CLR: 519 mutex_lock(&rv8803->flags_lock); 520 flags = rv8803_read_reg(client, RV8803_FLAG); 521 if (flags < 0) { 522 mutex_unlock(&rv8803->flags_lock); 523 return flags; 524 } 525 526 flags &= ~RV8803_FLAG_V1F; 527 ret = rv8803_write_reg(client, RV8803_FLAG, flags); 528 mutex_unlock(&rv8803->flags_lock); 529 if (ret) 530 return ret; 531 532 return 0; 533 534 default: 535 return -ENOIOCTLCMD; 536 } 537} 538 539static int rv8803_nvram_write(void *priv, unsigned int offset, void *val, 540 size_t bytes) 541{ 542 return rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val); 543} 544 545static int rv8803_nvram_read(void *priv, unsigned int offset, 546 void *val, size_t bytes) 547{ 548 int ret; 549 550 ret = rv8803_read_reg(priv, RV8803_RAM); 551 if (ret < 0) 552 return ret; 553 554 *(u8 *)val = ret; 555 556 return 0; 557} 558 559static const struct rtc_class_ops rv8803_rtc_ops = { 560 .read_time = rv8803_get_time, 561 .set_time = rv8803_set_time, 562 .ioctl = rv8803_ioctl, 563 .read_alarm = rv8803_get_alarm, 564 .set_alarm = rv8803_set_alarm, 565 .alarm_irq_enable = rv8803_alarm_irq_enable, 566}; 567 568static int rx8900_trickle_charger_init(struct rv8803_data *rv8803) 569{ 570 struct i2c_client *client = rv8803->client; 571 struct device_node *node = client->dev.of_node; 572 int err; 573 u8 flags; 574 575 if (!node) 576 return 0; 577 578 if (rv8803->type != rx_8900) 579 return 0; 580 581 err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL); 582 if (err < 0) 583 return err; 584 585 flags = (u8)err; 586 flags &= ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF); 587 flags |= rv8803->backup; 588 589 return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL, 590 flags); 591} 592 593/* configure registers with values different than the Power-On reset defaults */ 594static int rv8803_regs_configure(struct rv8803_data *rv8803) 595{ 596 int err; 597 598 err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA); 599 if (err) 600 return err; 601 602 err = rx8900_trickle_charger_init(rv8803); 603 if (err) { 604 dev_err(&rv8803->client->dev, "failed to init charger\n"); 605 return err; 606 } 607 608 return 0; 609} 610 611static int rv8803_resume(struct device *dev) 612{ 613 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 614 615 if (rv8803->client->irq > 0 && device_may_wakeup(dev)) 616 disable_irq_wake(rv8803->client->irq); 617 618 return 0; 619} 620 621static int rv8803_suspend(struct device *dev) 622{ 623 struct rv8803_data *rv8803 = dev_get_drvdata(dev); 624 625 if (rv8803->client->irq > 0 && device_may_wakeup(dev)) 626 enable_irq_wake(rv8803->client->irq); 627 628 return 0; 629} 630 631static DEFINE_SIMPLE_DEV_PM_OPS(rv8803_pm_ops, rv8803_suspend, rv8803_resume); 632 633static const struct i2c_device_id rv8803_id[] = { 634 { "rv8803", rv_8803 }, 635 { "rv8804", rx_8804 }, 636 { "rx8803", rx_8803 }, 637 { "rx8900", rx_8900 }, 638 { } 639}; 640MODULE_DEVICE_TABLE(i2c, rv8803_id); 641 642static int rv8803_probe(struct i2c_client *client) 643{ 644 struct i2c_adapter *adapter = client->adapter; 645 struct rv8803_data *rv8803; 646 int err, flags; 647 struct nvmem_config nvmem_cfg = { 648 .name = "rv8803_nvram", 649 .word_size = 1, 650 .stride = 1, 651 .size = 1, 652 .reg_read = rv8803_nvram_read, 653 .reg_write = rv8803_nvram_write, 654 .priv = client, 655 }; 656 657 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | 658 I2C_FUNC_SMBUS_I2C_BLOCK)) { 659 dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n"); 660 return -EIO; 661 } 662 663 rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data), 664 GFP_KERNEL); 665 if (!rv8803) 666 return -ENOMEM; 667 668 mutex_init(&rv8803->flags_lock); 669 rv8803->client = client; 670 if (client->dev.of_node) { 671 rv8803->type = (uintptr_t)of_device_get_match_data(&client->dev); 672 } else { 673 const struct i2c_device_id *id = i2c_match_id(rv8803_id, client); 674 675 rv8803->type = id->driver_data; 676 } 677 i2c_set_clientdata(client, rv8803); 678 679 flags = rv8803_read_reg(client, RV8803_FLAG); 680 if (flags < 0) 681 return flags; 682 683 if (flags & RV8803_FLAG_V1F) 684 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); 685 686 if (flags & RV8803_FLAG_V2F) 687 dev_warn(&client->dev, "Voltage low, data loss detected.\n"); 688 689 if (flags & RV8803_FLAG_AF) 690 dev_warn(&client->dev, "An alarm maybe have been missed.\n"); 691 692 rv8803->rtc = devm_rtc_allocate_device(&client->dev); 693 if (IS_ERR(rv8803->rtc)) 694 return PTR_ERR(rv8803->rtc); 695 696 if (client->irq > 0) { 697 unsigned long irqflags = IRQF_TRIGGER_LOW; 698 699 if (dev_fwnode(&client->dev)) 700 irqflags = 0; 701 702 err = devm_request_threaded_irq(&client->dev, client->irq, 703 NULL, rv8803_handle_irq, 704 irqflags | IRQF_ONESHOT, 705 "rv8803", client); 706 if (err) { 707 dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); 708 client->irq = 0; 709 } else { 710 device_init_wakeup(&client->dev, true); 711 err = dev_pm_set_wake_irq(&client->dev, client->irq); 712 if (err) 713 dev_err(&client->dev, "failed to set wake IRQ\n"); 714 } 715 } else { 716 if (device_property_read_bool(&client->dev, "wakeup-source")) 717 device_init_wakeup(&client->dev, true); 718 else 719 clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features); 720 } 721 722 if (of_property_read_bool(client->dev.of_node, "epson,vdet-disable")) 723 rv8803->backup |= RX8900_FLAG_VDETOFF; 724 725 if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable")) 726 rv8803->backup |= RX8900_FLAG_SWOFF; 727 728 err = rv8803_regs_configure(rv8803); 729 if (err) 730 return err; 731 732 rv8803->rtc->ops = &rv8803_rtc_ops; 733 rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; 734 rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099; 735 err = devm_rtc_register_device(rv8803->rtc); 736 if (err) 737 return err; 738 739 devm_rtc_nvmem_register(rv8803->rtc, &nvmem_cfg); 740 741 rv8803->rtc->max_user_freq = 1; 742 743 return 0; 744} 745 746static const __maybe_unused struct of_device_id rv8803_of_match[] = { 747 { 748 .compatible = "microcrystal,rv8803", 749 .data = (void *)rv_8803 750 }, 751 { 752 .compatible = "epson,rx8803", 753 .data = (void *)rx_8803 754 }, 755 { 756 .compatible = "epson,rx8804", 757 .data = (void *)rx_8804 758 }, 759 { 760 .compatible = "epson,rx8900", 761 .data = (void *)rx_8900 762 }, 763 { } 764}; 765MODULE_DEVICE_TABLE(of, rv8803_of_match); 766 767static struct i2c_driver rv8803_driver = { 768 .driver = { 769 .name = "rtc-rv8803", 770 .of_match_table = of_match_ptr(rv8803_of_match), 771 .pm = &rv8803_pm_ops, 772 }, 773 .probe = rv8803_probe, 774 .id_table = rv8803_id, 775}; 776module_i2c_driver(rv8803_driver); 777 778MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>"); 779MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver"); 780MODULE_LICENSE("GPL v2"); 781