drivers/rtc/rtc-s5m.c

   1 /*
   2  * Copyright (c) 2013 Samsung Electronics Co., Ltd
   3  *      http://www.samsung.com
   4  *
   5  *  Copyright (C) 2013 Google, Inc
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/i2c.h>
  20 #include <linux/slab.h>
  21 #include <linux/bcd.h>
  22 #include <linux/bitops.h>
  23 #include <linux/regmap.h>
  24 #include <linux/rtc.h>
  25 #include <linux/delay.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/mfd/samsung/core.h>
  28 #include <linux/mfd/samsung/irq.h>
  29 #include <linux/mfd/samsung/rtc.h>
  30
  31 /*
  32  * Maximum number of retries for checking changes in UDR field
  33  * of S5M_RTC_UDR_CON register (to limit possible endless loop).
  34  *
  35  * After writing to RTC registers (setting time or alarm) read the UDR field
  36  * in S5M_RTC_UDR_CON register. UDR is auto-cleared when data have
  37  * been transferred.
  38  */
  39 #define UDR_READ_RETRY_CNT      5
  40
  41 struct s5m_rtc_info {
  42         struct device *dev;
  43         struct i2c_client *i2c;
  44         struct sec_pmic_dev *s5m87xx;
  45         struct regmap *regmap;
  46         struct rtc_device *rtc_dev;
  47         int irq;
  48         int device_type;
  49         int rtc_24hr_mode;
  50         bool wtsr_smpl;
  51 };
  52
  53 static const struct regmap_config s5m_rtc_regmap_config = {
  54         .reg_bits = 8,
  55         .val_bits = 8,
  56
  57         .max_register = S5M_RTC_REG_MAX,
  58 };
  59
  60 static const struct regmap_config s2mps14_rtc_regmap_config = {
  61         .reg_bits = 8,
  62         .val_bits = 8,
  63
  64         .max_register = S2MPS_RTC_REG_MAX,
  65 };
  66
  67 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
  68                                int rtc_24hr_mode)
  69 {
  70         tm->tm_sec = data[RTC_SEC] & 0x7f;
  71         tm->tm_min = data[RTC_MIN] & 0x7f;
  72         if (rtc_24hr_mode) {
  73                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
  74         } else {
  75                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
  76                 if (data[RTC_HOUR] & HOUR_PM_MASK)
  77                         tm->tm_hour += 12;
  78         }
  79
  80         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
  81         tm->tm_mday = data[RTC_DATE] & 0x1f;
  82         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
  83         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
  84         tm->tm_yday = 0;
  85         tm->tm_isdst = 0;
  86 }
  87
  88 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
  89 {
  90         data[RTC_SEC] = tm->tm_sec;
  91         data[RTC_MIN] = tm->tm_min;
  92
  93         if (tm->tm_hour >= 12)
  94                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
  95         else
  96                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
  97
  98         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
  99         data[RTC_DATE] = tm->tm_mday;
 100         data[RTC_MONTH] = tm->tm_mon + 1;
 101         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
 102
 103         if (tm->tm_year < 100) {
 104                 pr_err("s5m8767 RTC cannot handle the year %d.\n",
 105                        1900 + tm->tm_year);
 106                 return -EINVAL;
 107         } else {
 108                 return 0;
 109         }
 110 }
 111
 112 /*
 113  * Read RTC_UDR_CON register and wait till UDR field is cleared.
 114  * This indicates that time/alarm update ended.
 115  */
 116 static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 117 {
 118         int ret, retry = UDR_READ_RETRY_CNT;
 119         unsigned int data;
 120
 121         do {
 122                 ret = regmap_read(info->regmap, S5M_RTC_UDR_CON, &data);
 123         } while (--retry && (data & S5M_RTC_UDR_MASK) && !ret);
 124
 125         if (!retry)
 126                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 127
 128         return ret;
 129 }
 130
 131 static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 132 {
 133         int ret;
 134         unsigned int data;
 135
 136         ret = regmap_read(info->regmap, S5M_RTC_UDR_CON, &data);
 137         if (ret < 0) {
 138                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 139                 return ret;
 140         }
 141
 142         data |= S5M_RTC_TIME_EN_MASK;
 143         data |= S5M_RTC_UDR_MASK;
 144
 145         ret = regmap_write(info->regmap, S5M_RTC_UDR_CON, data);
 146         if (ret < 0) {
 147                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 148                 return ret;
 149         }
 150
 151         ret = s5m8767_wait_for_udr_update(info);
 152
 153         return ret;
 154 }
 155
 156 static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 157 {
 158         int ret;
 159         unsigned int data;
 160
 161         ret = regmap_read(info->regmap, S5M_RTC_UDR_CON, &data);
 162         if (ret < 0) {
 163                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 164                         __func__, ret);
 165                 return ret;
 166         }
 167
 168         data &= ~S5M_RTC_TIME_EN_MASK;
 169         data |= S5M_RTC_UDR_MASK;
 170
 171         ret = regmap_write(info->regmap, S5M_RTC_UDR_CON, data);
 172         if (ret < 0) {
 173                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 174                         __func__, ret);
 175                 return ret;
 176         }
 177
 178         ret = s5m8767_wait_for_udr_update(info);
 179
 180         return ret;
 181 }
 182
 183 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 184 {
 185         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 186         tm->tm_min = bcd2bin(data[RTC_MIN]);
 187
 188         if (data[RTC_HOUR] & HOUR_12) {
 189                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 190                 if (data[RTC_HOUR] & HOUR_PM)
 191                         tm->tm_hour += 12;
 192         } else {
 193                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 194         }
 195
 196         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 197         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 198         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 199         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 200         tm->tm_year -= 1900;
 201 }
 202
 203 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 204 {
 205         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 206         data[RTC_MIN] = bin2bcd(tm->tm_min);
 207         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 208         data[RTC_WEEKDAY] = tm->tm_wday;
 209         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 210         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 211         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 212         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 213 }
 214
 215 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 216 {
 217         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 218         u8 data[8];
 219         int ret;
 220
 221         ret = regmap_bulk_read(info->regmap, S5M_RTC_SEC, data, 8);
 222         if (ret < 0)
 223                 return ret;
 224
 225         switch (info->device_type) {
 226         case S5M8763X:
 227                 s5m8763_data_to_tm(data, tm);
 228                 break;
 229
 230         case S5M8767X:
 231                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 232                 break;
 233
 234         default:
 235                 return -EINVAL;
 236         }
 237
 238         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 239                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 240                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 241
 242         return rtc_valid_tm(tm);
 243 }
 244
 245 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 246 {
 247         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 248         u8 data[8];
 249         int ret = 0;
 250
 251         switch (info->device_type) {
 252         case S5M8763X:
 253                 s5m8763_tm_to_data(tm, data);
 254                 break;
 255         case S5M8767X:
 256                 ret = s5m8767_tm_to_data(tm, data);
 257                 break;
 258         default:
 259                 return -EINVAL;
 260         }
 261
 262         if (ret < 0)
 263                 return ret;
 264
 265         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 266                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 267                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 268
 269         ret = regmap_raw_write(info->regmap, S5M_RTC_SEC, data, 8);
 270         if (ret < 0)
 271                 return ret;
 272
 273         ret = s5m8767_rtc_set_time_reg(info);
 274
 275         return ret;
 276 }
 277
 278 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 279 {
 280         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 281         u8 data[8];
 282         unsigned int val;
 283         int ret, i;
 284
 285         ret = regmap_bulk_read(info->regmap, S5M_ALARM0_SEC, data, 8);
 286         if (ret < 0)
 287                 return ret;
 288
 289         switch (info->device_type) {
 290         case S5M8763X:
 291                 s5m8763_data_to_tm(data, &alrm->time);
 292                 ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
 293                 if (ret < 0)
 294                         return ret;
 295
 296                 alrm->enabled = !!val;
 297
 298                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 299                 if (ret < 0)
 300                         return ret;
 301
 302                 break;
 303
 304         case S5M8767X:
 305                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 306                 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 307                         1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 308                         alrm->time.tm_mday, alrm->time.tm_hour,
 309                         alrm->time.tm_min, alrm->time.tm_sec,
 310                         alrm->time.tm_wday);
 311
 312                 alrm->enabled = 0;
 313                 for (i = 0; i < 7; i++) {
 314                         if (data[i] & ALARM_ENABLE_MASK) {
 315                                 alrm->enabled = 1;
 316                                 break;
 317                         }
 318                 }
 319
 320                 alrm->pending = 0;
 321                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 322                 if (ret < 0)
 323                         return ret;
 324                 break;
 325
 326         default:
 327                 return -EINVAL;
 328         }
 329
 330         if (val & S5M_ALARM0_STATUS)
 331                 alrm->pending = 1;
 332         else
 333                 alrm->pending = 0;
 334
 335         return 0;
 336 }
 337
 338 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 339 {
 340         u8 data[8];
 341         int ret, i;
 342         struct rtc_time tm;
 343
 344         ret = regmap_bulk_read(info->regmap, S5M_ALARM0_SEC, data, 8);
 345         if (ret < 0)
 346                 return ret;
 347
 348         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 349         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 350                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 351                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 352
 353         switch (info->device_type) {
 354         case S5M8763X:
 355                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
 356                 break;
 357
 358         case S5M8767X:
 359                 for (i = 0; i < 7; i++)
 360                         data[i] &= ~ALARM_ENABLE_MASK;
 361
 362                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_SEC, data, 8);
 363                 if (ret < 0)
 364                         return ret;
 365
 366                 ret = s5m8767_rtc_set_alarm_reg(info);
 367
 368                 break;
 369
 370         default:
 371                 return -EINVAL;
 372         }
 373
 374         return ret;
 375 }
 376
 377 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 378 {
 379         int ret;
 380         u8 data[8];
 381         u8 alarm0_conf;
 382         struct rtc_time tm;
 383
 384         ret = regmap_bulk_read(info->regmap, S5M_ALARM0_SEC, data, 8);
 385         if (ret < 0)
 386                 return ret;
 387
 388         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 389         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 390                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 391                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 392
 393         switch (info->device_type) {
 394         case S5M8763X:
 395                 alarm0_conf = 0x77;
 396                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
 397                 break;
 398
 399         case S5M8767X:
 400                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 401                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 402                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 403                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 404                 if (data[RTC_DATE] & 0x1f)
 405                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 406                 if (data[RTC_MONTH] & 0xf)
 407                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 408                 if (data[RTC_YEAR1] & 0x7f)
 409                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 410
 411                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_SEC, data, 8);
 412                 if (ret < 0)
 413                         return ret;
 414                 ret = s5m8767_rtc_set_alarm_reg(info);
 415
 416                 break;
 417
 418         default:
 419                 return -EINVAL;
 420         }
 421
 422         return ret;
 423 }
 424
 425 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 426 {
 427         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 428         u8 data[8];
 429         int ret;
 430
 431         switch (info->device_type) {
 432         case S5M8763X:
 433                 s5m8763_tm_to_data(&alrm->time, data);
 434                 break;
 435
 436         case S5M8767X:
 437                 s5m8767_tm_to_data(&alrm->time, data);
 438                 break;
 439
 440         default:
 441                 return -EINVAL;
 442         }
 443
 444         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 445                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 446                 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
 447                 alrm->time.tm_sec, alrm->time.tm_wday);
 448
 449         ret = s5m_rtc_stop_alarm(info);
 450         if (ret < 0)
 451                 return ret;
 452
 453         ret = regmap_raw_write(info->regmap, S5M_ALARM0_SEC, data, 8);
 454         if (ret < 0)
 455                 return ret;
 456
 457         ret = s5m8767_rtc_set_alarm_reg(info);
 458         if (ret < 0)
 459                 return ret;
 460
 461         if (alrm->enabled)
 462                 ret = s5m_rtc_start_alarm(info);
 463
 464         return ret;
 465 }
 466
 467 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 468                                     unsigned int enabled)
 469 {
 470         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 471
 472         if (enabled)
 473                 return s5m_rtc_start_alarm(info);
 474         else
 475                 return s5m_rtc_stop_alarm(info);
 476 }
 477
 478 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 479 {
 480         struct s5m_rtc_info *info = data;
 481
 482         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 483
 484         return IRQ_HANDLED;
 485 }
 486
 487 static const struct rtc_class_ops s5m_rtc_ops = {
 488         .read_time = s5m_rtc_read_time,
 489         .set_time = s5m_rtc_set_time,
 490         .read_alarm = s5m_rtc_read_alarm,
 491         .set_alarm = s5m_rtc_set_alarm,
 492         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 493 };
 494
 495 static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
 496 {
 497         int ret;
 498         ret = regmap_update_bits(info->regmap, S5M_WTSR_SMPL_CNTL,
 499                                  WTSR_ENABLE_MASK,
 500                                  enable ? WTSR_ENABLE_MASK : 0);
 501         if (ret < 0)
 502                 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
 503                         __func__, ret);
 504 }
 505
 506 static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
 507 {
 508         int ret;
 509         ret = regmap_update_bits(info->regmap, S5M_WTSR_SMPL_CNTL,
 510                                  SMPL_ENABLE_MASK,
 511                                  enable ? SMPL_ENABLE_MASK : 0);
 512         if (ret < 0)
 513                 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
 514                         __func__, ret);
 515 }
 516
 517 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 518 {
 519         u8 data[2];
 520         int ret;
 521
 522         /* Set RTC control register : Binary mode, 24hour mode */
 523         data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 524         data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 525
 526         info->rtc_24hr_mode = 1;
 527         ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 528         if (ret < 0) {
 529                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 530                         __func__, ret);
 531                 return ret;
 532         }
 533
 534         return ret;
 535 }
 536
 537 static int s5m_rtc_probe(struct platform_device *pdev)
 538 {
 539         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 540         struct sec_platform_data *pdata = s5m87xx->pdata;
 541         struct s5m_rtc_info *info;
 542         const struct regmap_config *regmap_cfg;
 543         int ret;
 544
 545         if (!pdata) {
 546                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 547                 return -ENODEV;
 548         }
 549
 550         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 551         if (!info)
 552                 return -ENOMEM;
 553
 554         switch (pdata->device_type) {
 555         case S2MPS14X:
 556                 regmap_cfg = &s2mps14_rtc_regmap_config;
 557                 break;
 558         case S5M8763X:
 559                 regmap_cfg = &s5m_rtc_regmap_config;
 560                 break;
 561         case S5M8767X:
 562                 regmap_cfg = &s5m_rtc_regmap_config;
 563                 break;
 564         default:
 565                 dev_err(&pdev->dev, "Device type is not supported by RTC driver\n");
 566                 return -ENODEV;
 567         }
 568
 569         info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
 570         if (!info->i2c) {
 571                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 572                 return -ENODEV;
 573         }
 574
 575         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 576         if (IS_ERR(info->regmap)) {
 577                 ret = PTR_ERR(info->regmap);
 578                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 579                                 ret);
 580                 goto err;
 581         }
 582
 583         info->dev = &pdev->dev;
 584         info->s5m87xx = s5m87xx;
 585         info->device_type = s5m87xx->device_type;
 586         info->wtsr_smpl = s5m87xx->wtsr_smpl;
 587
 588         switch (pdata->device_type) {
 589         case S5M8763X:
 590                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
 591                                 S5M8763_IRQ_ALARM0);
 592                 break;
 593
 594         case S5M8767X:
 595                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
 596                                 S5M8767_IRQ_RTCA1);
 597                 break;
 598
 599         default:
 600                 ret = -EINVAL;
 601                 dev_err(&pdev->dev, "Unsupported device type: %d\n", ret);
 602                 goto err;
 603         }
 604
 605         platform_set_drvdata(pdev, info);
 606
 607         ret = s5m8767_rtc_init_reg(info);
 608
 609         if (info->wtsr_smpl) {
 610                 s5m_rtc_enable_wtsr(info, true);
 611                 s5m_rtc_enable_smpl(info, true);
 612         }
 613
 614         device_init_wakeup(&pdev->dev, 1);
 615
 616         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 617                                                  &s5m_rtc_ops, THIS_MODULE);
 618
 619         if (IS_ERR(info->rtc_dev)) {
 620                 ret = PTR_ERR(info->rtc_dev);
 621                 goto err;
 622         }
 623
 624         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 625                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 626                                         info);
 627         if (ret < 0) {
 628                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 629                         info->irq, ret);
 630                 goto err;
 631         }
 632
 633         return 0;
 634
 635 err:
 636         i2c_unregister_device(info->i2c);
 637
 638         return ret;
 639 }
 640
 641 static void s5m_rtc_shutdown(struct platform_device *pdev)
 642 {
 643         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 644         int i;
 645         unsigned int val = 0;
 646         if (info->wtsr_smpl) {
 647                 for (i = 0; i < 3; i++) {
 648                         s5m_rtc_enable_wtsr(info, false);
 649                         regmap_read(info->regmap, S5M_WTSR_SMPL_CNTL, &val);
 650                         pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
 651                         if (val & WTSR_ENABLE_MASK)
 652                                 pr_emerg("%s: fail to disable WTSR\n",
 653                                          __func__);
 654                         else {
 655                                 pr_info("%s: success to disable WTSR\n",
 656                                         __func__);
 657                                 break;
 658                         }
 659                 }
 660         }
 661         /* Disable SMPL when power off */
 662         s5m_rtc_enable_smpl(info, false);
 663 }
 664
 665 static int s5m_rtc_remove(struct platform_device *pdev)
 666 {
 667         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 668
 669         /* Perform also all shutdown steps when removing */
 670         s5m_rtc_shutdown(pdev);
 671         i2c_unregister_device(info->i2c);
 672
 673         return 0;
 674 }
 675
 676 #ifdef CONFIG_PM_SLEEP
 677 static int s5m_rtc_resume(struct device *dev)
 678 {
 679         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 680         int ret = 0;
 681
 682         if (device_may_wakeup(dev))
 683                 ret = disable_irq_wake(info->irq);
 684
 685         return ret;
 686 }
 687
 688 static int s5m_rtc_suspend(struct device *dev)
 689 {
 690         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 691         int ret = 0;
 692
 693         if (device_may_wakeup(dev))
 694                 ret = enable_irq_wake(info->irq);
 695
 696         return ret;
 697 }
 698 #endif /* CONFIG_PM_SLEEP */
 699
 700 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 701
 702 static const struct platform_device_id s5m_rtc_id[] = {
 703         { "s5m-rtc", 0 },
 704 };
 705
 706 static struct platform_driver s5m_rtc_driver = {
 707         .driver         = {
 708                 .name   = "s5m-rtc",
 709                 .owner  = THIS_MODULE,
 710                 .pm     = &s5m_rtc_pm_ops,
 711         },
 712         .probe          = s5m_rtc_probe,
 713         .remove         = s5m_rtc_remove,
 714         .shutdown       = s5m_rtc_shutdown,
 715         .id_table       = s5m_rtc_id,
 716 };
 717
 718 module_platform_driver(s5m_rtc_driver);
 719
 720 /* Module information */
 721 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 722 MODULE_DESCRIPTION("Samsung S5M RTC driver");
 723 MODULE_LICENSE("GPL");
 724 MODULE_ALIAS("platform:s5m-rtc");