1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock 4 * 5 * Copyright (C) 2009-2011 Freescale Semiconductor. 6 * Author: Jack Lan <jack.lan@freescale.com> 7 * Copyright (C) 2008 MIMOMax Wireless Ltd. 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/interrupt.h> 15 #include <linux/i2c.h> 16 #include <linux/spi/spi.h> 17 #include <linux/rtc.h> 18 #include <linux/bcd.h> 19 #include <linux/slab.h> 20 #include <linux/regmap.h> 21 #include <linux/hwmon.h> 22 23 #define DS3232_REG_SECONDS 0x00 24 #define DS3232_REG_MINUTES 0x01 25 #define DS3232_REG_HOURS 0x02 26 #define DS3232_REG_AMPM 0x02 27 #define DS3232_REG_DAY 0x03 28 #define DS3232_REG_DATE 0x04 29 #define DS3232_REG_MONTH 0x05 30 #define DS3232_REG_CENTURY 0x05 31 #define DS3232_REG_YEAR 0x06 32 #define DS3232_REG_ALARM1 0x07 /* Alarm 1 BASE */ 33 #define DS3232_REG_ALARM2 0x0B /* Alarm 2 BASE */ 34 #define DS3232_REG_CR 0x0E /* Control register */ 35 # define DS3232_REG_CR_nEOSC 0x80 36 # define DS3232_REG_CR_INTCN 0x04 37 # define DS3232_REG_CR_A2IE 0x02 38 # define DS3232_REG_CR_A1IE 0x01 39 40 #define DS3232_REG_SR 0x0F /* control/status register */ 41 # define DS3232_REG_SR_OSF 0x80 42 # define DS3232_REG_SR_BSY 0x04 43 # define DS3232_REG_SR_A2F 0x02 44 # define DS3232_REG_SR_A1F 0x01 45 46 #define DS3232_REG_TEMPERATURE 0x11 47 #define DS3232_REG_SRAM_START 0x14 48 #define DS3232_REG_SRAM_END 0xFF 49 50 #define DS3232_REG_SRAM_SIZE 236 51 52 struct ds3232 { 53 struct device *dev; 54 struct regmap *regmap; 55 int irq; 56 struct rtc_device *rtc; 57 58 bool suspended; 59 }; 60 61 static int ds3232_check_rtc_status(struct device *dev) 62 { 63 struct ds3232 *ds3232 = dev_get_drvdata(dev); 64 int ret = 0; 65 int control, stat; 66 67 ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); 68 if (ret) 69 return ret; 70 71 if (stat & DS3232_REG_SR_OSF) 72 dev_warn(dev, 73 "oscillator discontinuity flagged, " 74 "time unreliable\n"); 75 76 stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F); 77 78 ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat); 79 if (ret) 80 return ret; 81 82 /* If the alarm is pending, clear it before requesting 83 * the interrupt, so an interrupt event isn't reported 84 * before everything is initialized. 85 */ 86 87 ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); 88 if (ret) 89 return ret; 90 91 control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE); 92 control |= DS3232_REG_CR_INTCN; 93 94 return regmap_write(ds3232->regmap, DS3232_REG_CR, control); 95 } 96 97 static int ds3232_read_time(struct device *dev, struct rtc_time *time) 98 { 99 struct ds3232 *ds3232 = dev_get_drvdata(dev); 100 int ret; 101 u8 buf[7]; 102 unsigned int year, month, day, hour, minute, second; 103 unsigned int week, twelve_hr, am_pm; 104 unsigned int century, add_century = 0; 105 106 ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_SECONDS, buf, 7); 107 if (ret) 108 return ret; 109 110 second = buf[0]; 111 minute = buf[1]; 112 hour = buf[2]; 113 week = buf[3]; 114 day = buf[4]; 115 month = buf[5]; 116 year = buf[6]; 117 118 /* Extract additional information for AM/PM and century */ 119 120 twelve_hr = hour & 0x40; 121 am_pm = hour & 0x20; 122 century = month & 0x80; 123 124 /* Write to rtc_time structure */ 125 126 time->tm_sec = bcd2bin(second); 127 time->tm_min = bcd2bin(minute); 128 if (twelve_hr) { 129 /* Convert to 24 hr */ 130 if (am_pm) 131 time->tm_hour = bcd2bin(hour & 0x1F) + 12; 132 else 133 time->tm_hour = bcd2bin(hour & 0x1F); 134 } else { 135 time->tm_hour = bcd2bin(hour); 136 } 137 138 /* Day of the week in linux range is 0~6 while 1~7 in RTC chip */ 139 time->tm_wday = bcd2bin(week) - 1; 140 time->tm_mday = bcd2bin(day); 141 /* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */ 142 time->tm_mon = bcd2bin(month & 0x7F) - 1; 143 if (century) 144 add_century = 100; 145 146 time->tm_year = bcd2bin(year) + add_century; 147 148 return 0; 149 } 150 151 static int ds3232_set_time(struct device *dev, struct rtc_time *time) 152 { 153 struct ds3232 *ds3232 = dev_get_drvdata(dev); 154 u8 buf[7]; 155 156 /* Extract time from rtc_time and load into ds3232*/ 157 158 buf[0] = bin2bcd(time->tm_sec); 159 buf[1] = bin2bcd(time->tm_min); 160 buf[2] = bin2bcd(time->tm_hour); 161 /* Day of the week in linux range is 0~6 while 1~7 in RTC chip */ 162 buf[3] = bin2bcd(time->tm_wday + 1); 163 buf[4] = bin2bcd(time->tm_mday); /* Date */ 164 /* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */ 165 buf[5] = bin2bcd(time->tm_mon + 1); 166 if (time->tm_year >= 100) { 167 buf[5] |= 0x80; 168 buf[6] = bin2bcd(time->tm_year - 100); 169 } else { 170 buf[6] = bin2bcd(time->tm_year); 171 } 172 173 return regmap_bulk_write(ds3232->regmap, DS3232_REG_SECONDS, buf, 7); 174 } 175 176 /* 177 * DS3232 has two alarm, we only use alarm1 178 * According to linux specification, only support one-shot alarm 179 * no periodic alarm mode 180 */ 181 static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 182 { 183 struct ds3232 *ds3232 = dev_get_drvdata(dev); 184 int control, stat; 185 int ret; 186 u8 buf[4]; 187 188 ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); 189 if (ret) 190 goto out; 191 ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); 192 if (ret) 193 goto out; 194 ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_ALARM1, buf, 4); 195 if (ret) 196 goto out; 197 198 alarm->time.tm_sec = bcd2bin(buf[0] & 0x7F); 199 alarm->time.tm_min = bcd2bin(buf[1] & 0x7F); 200 alarm->time.tm_hour = bcd2bin(buf[2] & 0x7F); 201 alarm->time.tm_mday = bcd2bin(buf[3] & 0x7F); 202 203 alarm->enabled = !!(control & DS3232_REG_CR_A1IE); 204 alarm->pending = !!(stat & DS3232_REG_SR_A1F); 205 206 ret = 0; 207 out: 208 return ret; 209 } 210 211 /* 212 * linux rtc-module does not support wday alarm 213 * and only 24h time mode supported indeed 214 */ 215 static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 216 { 217 struct ds3232 *ds3232 = dev_get_drvdata(dev); 218 int control, stat; 219 int ret; 220 u8 buf[4]; 221 222 if (ds3232->irq <= 0) 223 return -EINVAL; 224 225 buf[0] = bin2bcd(alarm->time.tm_sec); 226 buf[1] = bin2bcd(alarm->time.tm_min); 227 buf[2] = bin2bcd(alarm->time.tm_hour); 228 buf[3] = bin2bcd(alarm->time.tm_mday); 229 230 /* clear alarm interrupt enable bit */ 231 ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); 232 if (ret) 233 goto out; 234 control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE); 235 ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control); 236 if (ret) 237 goto out; 238 239 /* clear any pending alarm flag */ 240 ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); 241 if (ret) 242 goto out; 243 stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F); 244 ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat); 245 if (ret) 246 goto out; 247 248 ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4); 249 if (ret) 250 goto out; 251 252 if (alarm->enabled) { 253 control |= DS3232_REG_CR_A1IE; 254 ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control); 255 } 256 out: 257 return ret; 258 } 259 260 static int ds3232_update_alarm(struct device *dev, unsigned int enabled) 261 { 262 struct ds3232 *ds3232 = dev_get_drvdata(dev); 263 int control; 264 int ret; 265 266 ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); 267 if (ret) 268 return ret; 269 270 if (enabled) 271 /* enable alarm1 interrupt */ 272 control |= DS3232_REG_CR_A1IE; 273 else 274 /* disable alarm1 interrupt */ 275 control &= ~(DS3232_REG_CR_A1IE); 276 ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control); 277 278 return ret; 279 } 280 281 /* 282 * Temperature sensor support for ds3232/ds3234 devices. 283 * A user-initiated temperature conversion is not started by this function, 284 * so the temperature is updated once every 64 seconds. 285 */ 286 static int ds3232_hwmon_read_temp(struct device *dev, long int *mC) 287 { 288 struct ds3232 *ds3232 = dev_get_drvdata(dev); 289 u8 temp_buf[2]; 290 s16 temp; 291 int ret; 292 293 ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf, 294 sizeof(temp_buf)); 295 if (ret < 0) 296 return ret; 297 298 /* 299 * Temperature is represented as a 10-bit code with a resolution of 300 * 0.25 degree celsius and encoded in two's complement format. 301 */ 302 temp = (temp_buf[0] << 8) | temp_buf[1]; 303 temp >>= 6; 304 *mC = temp * 250; 305 306 return 0; 307 } 308 309 static umode_t ds3232_hwmon_is_visible(const void *data, 310 enum hwmon_sensor_types type, 311 u32 attr, int channel) 312 { 313 if (type != hwmon_temp) 314 return 0; 315 316 switch (attr) { 317 case hwmon_temp_input: 318 return 0444; 319 default: 320 return 0; 321 } 322 } 323 324 static int ds3232_hwmon_read(struct device *dev, 325 enum hwmon_sensor_types type, 326 u32 attr, int channel, long *temp) 327 { 328 int err; 329 330 switch (attr) { 331 case hwmon_temp_input: 332 err = ds3232_hwmon_read_temp(dev, temp); 333 break; 334 default: 335 err = -EOPNOTSUPP; 336 break; 337 } 338 339 return err; 340 } 341 342 static u32 ds3232_hwmon_chip_config[] = { 343 HWMON_C_REGISTER_TZ, 344 0 345 }; 346 347 static const struct hwmon_channel_info ds3232_hwmon_chip = { 348 .type = hwmon_chip, 349 .config = ds3232_hwmon_chip_config, 350 }; 351 352 static u32 ds3232_hwmon_temp_config[] = { 353 HWMON_T_INPUT, 354 0 355 }; 356 357 static const struct hwmon_channel_info ds3232_hwmon_temp = { 358 .type = hwmon_temp, 359 .config = ds3232_hwmon_temp_config, 360 }; 361 362 static const struct hwmon_channel_info * const ds3232_hwmon_info[] = { 363 &ds3232_hwmon_chip, 364 &ds3232_hwmon_temp, 365 NULL 366 }; 367 368 static const struct hwmon_ops ds3232_hwmon_hwmon_ops = { 369 .is_visible = ds3232_hwmon_is_visible, 370 .read = ds3232_hwmon_read, 371 }; 372 373 static const struct hwmon_chip_info ds3232_hwmon_chip_info = { 374 .ops = &ds3232_hwmon_hwmon_ops, 375 .info = ds3232_hwmon_info, 376 }; 377 378 static void ds3232_hwmon_register(struct device *dev, const char *name) 379 { 380 struct ds3232 *ds3232 = dev_get_drvdata(dev); 381 struct device *hwmon_dev; 382 383 if (!IS_ENABLED(CONFIG_RTC_DRV_DS3232_HWMON)) 384 return; 385 386 hwmon_dev = devm_hwmon_device_register_with_info(dev, name, ds3232, 387 &ds3232_hwmon_chip_info, 388 NULL); 389 if (IS_ERR(hwmon_dev)) { 390 dev_err(dev, "unable to register hwmon device %ld\n", 391 PTR_ERR(hwmon_dev)); 392 } 393 } 394 395 static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled) 396 { 397 struct ds3232 *ds3232 = dev_get_drvdata(dev); 398 399 if (ds3232->irq <= 0) 400 return -EINVAL; 401 402 return ds3232_update_alarm(dev, enabled); 403 } 404 405 static irqreturn_t ds3232_irq(int irq, void *dev_id) 406 { 407 struct device *dev = dev_id; 408 struct ds3232 *ds3232 = dev_get_drvdata(dev); 409 int ret; 410 int stat, control; 411 412 rtc_lock(ds3232->rtc); 413 414 ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat); 415 if (ret) 416 goto unlock; 417 418 if (stat & DS3232_REG_SR_A1F) { 419 ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control); 420 if (ret) { 421 dev_warn(ds3232->dev, 422 "Read Control Register error %d\n", ret); 423 } else { 424 /* disable alarm1 interrupt */ 425 control &= ~(DS3232_REG_CR_A1IE); 426 ret = regmap_write(ds3232->regmap, DS3232_REG_CR, 427 control); 428 if (ret) { 429 dev_warn(ds3232->dev, 430 "Write Control Register error %d\n", 431 ret); 432 goto unlock; 433 } 434 435 /* clear the alarm pend flag */ 436 stat &= ~DS3232_REG_SR_A1F; 437 ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat); 438 if (ret) { 439 dev_warn(ds3232->dev, 440 "Write Status Register error %d\n", 441 ret); 442 goto unlock; 443 } 444 445 rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF); 446 } 447 } 448 449 unlock: 450 rtc_unlock(ds3232->rtc); 451 452 return IRQ_HANDLED; 453 } 454 455 static const struct rtc_class_ops ds3232_rtc_ops = { 456 .read_time = ds3232_read_time, 457 .set_time = ds3232_set_time, 458 .read_alarm = ds3232_read_alarm, 459 .set_alarm = ds3232_set_alarm, 460 .alarm_irq_enable = ds3232_alarm_irq_enable, 461 }; 462 463 static int ds3232_nvmem_read(void *priv, unsigned int offset, void *val, 464 size_t bytes) 465 { 466 struct regmap *ds3232_regmap = (struct regmap *)priv; 467 468 return regmap_bulk_read(ds3232_regmap, DS3232_REG_SRAM_START + offset, 469 val, bytes); 470 } 471 472 static int ds3232_nvmem_write(void *priv, unsigned int offset, void *val, 473 size_t bytes) 474 { 475 struct regmap *ds3232_regmap = (struct regmap *)priv; 476 477 return regmap_bulk_write(ds3232_regmap, DS3232_REG_SRAM_START + offset, 478 val, bytes); 479 } 480 481 static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq, 482 const char *name) 483 { 484 struct ds3232 *ds3232; 485 int ret; 486 struct nvmem_config nvmem_cfg = { 487 .name = "ds3232_sram", 488 .stride = 1, 489 .size = DS3232_REG_SRAM_SIZE, 490 .word_size = 1, 491 .reg_read = ds3232_nvmem_read, 492 .reg_write = ds3232_nvmem_write, 493 .priv = regmap, 494 .type = NVMEM_TYPE_BATTERY_BACKED 495 }; 496 497 ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL); 498 if (!ds3232) 499 return -ENOMEM; 500 501 ds3232->regmap = regmap; 502 ds3232->irq = irq; 503 ds3232->dev = dev; 504 dev_set_drvdata(dev, ds3232); 505 506 ret = ds3232_check_rtc_status(dev); 507 if (ret) 508 return ret; 509 510 if (ds3232->irq > 0) 511 device_init_wakeup(dev, 1); 512 513 ds3232_hwmon_register(dev, name); 514 515 ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops, 516 THIS_MODULE); 517 if (IS_ERR(ds3232->rtc)) 518 return PTR_ERR(ds3232->rtc); 519 520 ret = devm_rtc_nvmem_register(ds3232->rtc, &nvmem_cfg); 521 if(ret) 522 return ret; 523 524 if (ds3232->irq > 0) { 525 ret = devm_request_threaded_irq(dev, ds3232->irq, NULL, 526 ds3232_irq, 527 IRQF_SHARED | IRQF_ONESHOT, 528 name, dev); 529 if (ret) { 530 device_set_wakeup_capable(dev, 0); 531 ds3232->irq = 0; 532 dev_err(dev, "unable to request IRQ\n"); 533 } 534 } 535 536 return 0; 537 } 538 539 #if IS_ENABLED(CONFIG_I2C) 540 541 #ifdef CONFIG_PM_SLEEP 542 static int ds3232_suspend(struct device *dev) 543 { 544 struct ds3232 *ds3232 = dev_get_drvdata(dev); 545 546 if (device_may_wakeup(dev)) { 547 if (enable_irq_wake(ds3232->irq)) 548 dev_warn_once(dev, "Cannot set wakeup source\n"); 549 } 550 551 return 0; 552 } 553 554 static int ds3232_resume(struct device *dev) 555 { 556 struct ds3232 *ds3232 = dev_get_drvdata(dev); 557 558 if (device_may_wakeup(dev)) 559 disable_irq_wake(ds3232->irq); 560 561 return 0; 562 } 563 #endif 564 565 static const struct dev_pm_ops ds3232_pm_ops = { 566 SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume) 567 }; 568 569 static int ds3232_i2c_probe(struct i2c_client *client) 570 { 571 struct regmap *regmap; 572 static const struct regmap_config config = { 573 .reg_bits = 8, 574 .val_bits = 8, 575 .max_register = DS3232_REG_SRAM_END, 576 }; 577 578 regmap = devm_regmap_init_i2c(client, &config); 579 if (IS_ERR(regmap)) { 580 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n", 581 __func__, PTR_ERR(regmap)); 582 return PTR_ERR(regmap); 583 } 584 585 return ds3232_probe(&client->dev, regmap, client->irq, client->name); 586 } 587 588 static const struct i2c_device_id ds3232_id[] = { 589 { "ds3232" }, 590 { } 591 }; 592 MODULE_DEVICE_TABLE(i2c, ds3232_id); 593 594 static const __maybe_unused struct of_device_id ds3232_of_match[] = { 595 { .compatible = "dallas,ds3232" }, 596 { } 597 }; 598 MODULE_DEVICE_TABLE(of, ds3232_of_match); 599 600 static struct i2c_driver ds3232_driver = { 601 .driver = { 602 .name = "rtc-ds3232", 603 .of_match_table = of_match_ptr(ds3232_of_match), 604 .pm = &ds3232_pm_ops, 605 }, 606 .probe = ds3232_i2c_probe, 607 .id_table = ds3232_id, 608 }; 609 610 static int ds3232_register_driver(void) 611 { 612 return i2c_add_driver(&ds3232_driver); 613 } 614 615 static void ds3232_unregister_driver(void) 616 { 617 i2c_del_driver(&ds3232_driver); 618 } 619 620 #else 621 622 static int ds3232_register_driver(void) 623 { 624 return 0; 625 } 626 627 static void ds3232_unregister_driver(void) 628 { 629 } 630 631 #endif 632 633 #if IS_ENABLED(CONFIG_SPI_MASTER) 634 635 static int ds3234_probe(struct spi_device *spi) 636 { 637 int res; 638 unsigned int tmp; 639 static const struct regmap_config config = { 640 .reg_bits = 8, 641 .val_bits = 8, 642 .max_register = DS3232_REG_SRAM_END, 643 .write_flag_mask = 0x80, 644 }; 645 struct regmap *regmap; 646 647 regmap = devm_regmap_init_spi(spi, &config); 648 if (IS_ERR(regmap)) { 649 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n", 650 __func__, PTR_ERR(regmap)); 651 return PTR_ERR(regmap); 652 } 653 654 spi->mode = SPI_MODE_3; 655 spi->bits_per_word = 8; 656 spi_setup(spi); 657 658 res = regmap_read(regmap, DS3232_REG_SECONDS, &tmp); 659 if (res) 660 return res; 661 662 /* Control settings 663 * 664 * CONTROL_REG 665 * BIT 7 6 5 4 3 2 1 0 666 * EOSC BBSQW CONV RS2 RS1 INTCN A2IE A1IE 667 * 668 * 0 0 0 1 1 1 0 0 669 * 670 * CONTROL_STAT_REG 671 * BIT 7 6 5 4 3 2 1 0 672 * OSF BB32kHz CRATE1 CRATE0 EN32kHz BSY A2F A1F 673 * 674 * 1 0 0 0 1 0 0 0 675 */ 676 res = regmap_read(regmap, DS3232_REG_CR, &tmp); 677 if (res) 678 return res; 679 res = regmap_write(regmap, DS3232_REG_CR, tmp & 0x1c); 680 if (res) 681 return res; 682 683 res = regmap_read(regmap, DS3232_REG_SR, &tmp); 684 if (res) 685 return res; 686 res = regmap_write(regmap, DS3232_REG_SR, tmp & 0x88); 687 if (res) 688 return res; 689 690 /* Print our settings */ 691 res = regmap_read(regmap, DS3232_REG_CR, &tmp); 692 if (res) 693 return res; 694 dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp); 695 696 res = regmap_read(regmap, DS3232_REG_SR, &tmp); 697 if (res) 698 return res; 699 dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp); 700 701 return ds3232_probe(&spi->dev, regmap, spi->irq, "ds3234"); 702 } 703 704 static struct spi_driver ds3234_driver = { 705 .driver = { 706 .name = "ds3234", 707 }, 708 .probe = ds3234_probe, 709 }; 710 711 static int ds3234_register_driver(void) 712 { 713 return spi_register_driver(&ds3234_driver); 714 } 715 716 static void ds3234_unregister_driver(void) 717 { 718 spi_unregister_driver(&ds3234_driver); 719 } 720 721 #else 722 723 static int ds3234_register_driver(void) 724 { 725 return 0; 726 } 727 728 static void ds3234_unregister_driver(void) 729 { 730 } 731 732 #endif 733 734 static int __init ds323x_init(void) 735 { 736 int ret; 737 738 ret = ds3232_register_driver(); 739 if (ret) { 740 pr_err("Failed to register ds3232 driver: %d\n", ret); 741 return ret; 742 } 743 744 ret = ds3234_register_driver(); 745 if (ret) { 746 pr_err("Failed to register ds3234 driver: %d\n", ret); 747 ds3232_unregister_driver(); 748 } 749 750 return ret; 751 } 752 module_init(ds323x_init) 753 754 static void __exit ds323x_exit(void) 755 { 756 ds3234_unregister_driver(); 757 ds3232_unregister_driver(); 758 } 759 module_exit(ds323x_exit) 760 761 MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>"); 762 MODULE_AUTHOR("Dennis Aberilla <denzzzhome@yahoo.com>"); 763 MODULE_DESCRIPTION("Maxim/Dallas DS3232/DS3234 RTC Driver"); 764 MODULE_LICENSE("GPL"); 765 MODULE_ALIAS("spi:ds3234"); 766