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 SEC_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 SEC_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 sec_pmic_dev *s5m87xx;
  44         struct regmap *regmap;
  45         struct rtc_device *rtc_dev;
  46         int irq;
  47         int device_type;
  48         int rtc_24hr_mode;
  49         bool wtsr_smpl;
  50 };
  51
  52 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
  53                                int rtc_24hr_mode)
  54 {
  55         tm->tm_sec = data[RTC_SEC] & 0x7f;
  56         tm->tm_min = data[RTC_MIN] & 0x7f;
  57         if (rtc_24hr_mode) {
  58                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
  59         } else {
  60                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
  61                 if (data[RTC_HOUR] & HOUR_PM_MASK)
  62                         tm->tm_hour += 12;
  63         }
  64
  65         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
  66         tm->tm_mday = data[RTC_DATE] & 0x1f;
  67         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
  68         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
  69         tm->tm_yday = 0;
  70         tm->tm_isdst = 0;
  71 }
  72
  73 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
  74 {
  75         data[RTC_SEC] = tm->tm_sec;
  76         data[RTC_MIN] = tm->tm_min;
  77
  78         if (tm->tm_hour >= 12)
  79                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
  80         else
  81                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
  82
  83         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
  84         data[RTC_DATE] = tm->tm_mday;
  85         data[RTC_MONTH] = tm->tm_mon + 1;
  86         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
  87
  88         if (tm->tm_year < 100) {
  89                 pr_err("s5m8767 RTC cannot handle the year %d.\n",
  90                        1900 + tm->tm_year);
  91                 return -EINVAL;
  92         } else {
  93                 return 0;
  94         }
  95 }
  96
  97 /*
  98  * Read RTC_UDR_CON register and wait till UDR field is cleared.
  99  * This indicates that time/alarm update ended.
 100  */
 101 static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 102 {
 103         int ret, retry = UDR_READ_RETRY_CNT;
 104         unsigned int data;
 105
 106         do {
 107                 ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
 108         } while (--retry && (data & RTC_UDR_MASK) && !ret);
 109
 110         if (!retry)
 111                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 112
 113         return ret;
 114 }
 115
 116 static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 117 {
 118         int ret;
 119         unsigned int data;
 120
 121         ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
 122         if (ret < 0) {
 123                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 124                 return ret;
 125         }
 126
 127         data |= RTC_TIME_EN_MASK;
 128         data |= RTC_UDR_MASK;
 129
 130         ret = regmap_write(info->regmap, SEC_RTC_UDR_CON, data);
 131         if (ret < 0) {
 132                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 133                 return ret;
 134         }
 135
 136         ret = s5m8767_wait_for_udr_update(info);
 137
 138         return ret;
 139 }
 140
 141 static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 142 {
 143         int ret;
 144         unsigned int data;
 145
 146         ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
 147         if (ret < 0) {
 148                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 149                         __func__, ret);
 150                 return ret;
 151         }
 152
 153         data &= ~RTC_TIME_EN_MASK;
 154         data |= RTC_UDR_MASK;
 155
 156         ret = regmap_write(info->regmap, SEC_RTC_UDR_CON, data);
 157         if (ret < 0) {
 158                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 159                         __func__, ret);
 160                 return ret;
 161         }
 162
 163         ret = s5m8767_wait_for_udr_update(info);
 164
 165         return ret;
 166 }
 167
 168 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 169 {
 170         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 171         tm->tm_min = bcd2bin(data[RTC_MIN]);
 172
 173         if (data[RTC_HOUR] & HOUR_12) {
 174                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 175                 if (data[RTC_HOUR] & HOUR_PM)
 176                         tm->tm_hour += 12;
 177         } else {
 178                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 179         }
 180
 181         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 182         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 183         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 184         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 185         tm->tm_year -= 1900;
 186 }
 187
 188 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 189 {
 190         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 191         data[RTC_MIN] = bin2bcd(tm->tm_min);
 192         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 193         data[RTC_WEEKDAY] = tm->tm_wday;
 194         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 195         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 196         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 197         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 198 }
 199
 200 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 201 {
 202         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 203         u8 data[8];
 204         int ret;
 205
 206         ret = regmap_bulk_read(info->regmap, SEC_RTC_SEC, data, 8);
 207         if (ret < 0)
 208                 return ret;
 209
 210         switch (info->device_type) {
 211         case S5M8763X:
 212                 s5m8763_data_to_tm(data, tm);
 213                 break;
 214
 215         case S5M8767X:
 216                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 217                 break;
 218
 219         default:
 220                 return -EINVAL;
 221         }
 222
 223         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 224                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 225                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 226
 227         return rtc_valid_tm(tm);
 228 }
 229
 230 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 231 {
 232         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 233         u8 data[8];
 234         int ret = 0;
 235
 236         switch (info->device_type) {
 237         case S5M8763X:
 238                 s5m8763_tm_to_data(tm, data);
 239                 break;
 240         case S5M8767X:
 241                 ret = s5m8767_tm_to_data(tm, data);
 242                 break;
 243         default:
 244                 return -EINVAL;
 245         }
 246
 247         if (ret < 0)
 248                 return ret;
 249
 250         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 251                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 252                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 253
 254         ret = regmap_raw_write(info->regmap, SEC_RTC_SEC, data, 8);
 255         if (ret < 0)
 256                 return ret;
 257
 258         ret = s5m8767_rtc_set_time_reg(info);
 259
 260         return ret;
 261 }
 262
 263 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 264 {
 265         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 266         u8 data[8];
 267         unsigned int val;
 268         int ret, i;
 269
 270         ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
 271         if (ret < 0)
 272                 return ret;
 273
 274         switch (info->device_type) {
 275         case S5M8763X:
 276                 s5m8763_data_to_tm(data, &alrm->time);
 277                 ret = regmap_read(info->regmap, SEC_ALARM0_CONF, &val);
 278                 if (ret < 0)
 279                         return ret;
 280
 281                 alrm->enabled = !!val;
 282
 283                 ret = regmap_read(info->regmap, SEC_RTC_STATUS, &val);
 284                 if (ret < 0)
 285                         return ret;
 286
 287                 break;
 288
 289         case S5M8767X:
 290                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 291                 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 292                         1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 293                         alrm->time.tm_mday, alrm->time.tm_hour,
 294                         alrm->time.tm_min, alrm->time.tm_sec,
 295                         alrm->time.tm_wday);
 296
 297                 alrm->enabled = 0;
 298                 for (i = 0; i < 7; i++) {
 299                         if (data[i] & ALARM_ENABLE_MASK) {
 300                                 alrm->enabled = 1;
 301                                 break;
 302                         }
 303                 }
 304
 305                 alrm->pending = 0;
 306                 ret = regmap_read(info->regmap, SEC_RTC_STATUS, &val);
 307                 if (ret < 0)
 308                         return ret;
 309                 break;
 310
 311         default:
 312                 return -EINVAL;
 313         }
 314
 315         if (val & ALARM0_STATUS)
 316                 alrm->pending = 1;
 317         else
 318                 alrm->pending = 0;
 319
 320         return 0;
 321 }
 322
 323 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 324 {
 325         u8 data[8];
 326         int ret, i;
 327         struct rtc_time tm;
 328
 329         ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
 330         if (ret < 0)
 331                 return ret;
 332
 333         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 334         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 335                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 336                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 337
 338         switch (info->device_type) {
 339         case S5M8763X:
 340                 ret = regmap_write(info->regmap, SEC_ALARM0_CONF, 0);
 341                 break;
 342
 343         case S5M8767X:
 344                 for (i = 0; i < 7; i++)
 345                         data[i] &= ~ALARM_ENABLE_MASK;
 346
 347                 ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
 348                 if (ret < 0)
 349                         return ret;
 350
 351                 ret = s5m8767_rtc_set_alarm_reg(info);
 352
 353                 break;
 354
 355         default:
 356                 return -EINVAL;
 357         }
 358
 359         return ret;
 360 }
 361
 362 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 363 {
 364         int ret;
 365         u8 data[8];
 366         u8 alarm0_conf;
 367         struct rtc_time tm;
 368
 369         ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
 370         if (ret < 0)
 371                 return ret;
 372
 373         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 374         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 375                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 376                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 377
 378         switch (info->device_type) {
 379         case S5M8763X:
 380                 alarm0_conf = 0x77;
 381                 ret = regmap_write(info->regmap, SEC_ALARM0_CONF, alarm0_conf);
 382                 break;
 383
 384         case S5M8767X:
 385                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 386                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 387                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 388                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 389                 if (data[RTC_DATE] & 0x1f)
 390                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 391                 if (data[RTC_MONTH] & 0xf)
 392                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 393                 if (data[RTC_YEAR1] & 0x7f)
 394                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 395
 396                 ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
 397                 if (ret < 0)
 398                         return ret;
 399                 ret = s5m8767_rtc_set_alarm_reg(info);
 400
 401                 break;
 402
 403         default:
 404                 return -EINVAL;
 405         }
 406
 407         return ret;
 408 }
 409
 410 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 411 {
 412         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 413         u8 data[8];
 414         int ret;
 415
 416         switch (info->device_type) {
 417         case S5M8763X:
 418                 s5m8763_tm_to_data(&alrm->time, data);
 419                 break;
 420
 421         case S5M8767X:
 422                 s5m8767_tm_to_data(&alrm->time, data);
 423                 break;
 424
 425         default:
 426                 return -EINVAL;
 427         }
 428
 429         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 430                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 431                 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
 432                 alrm->time.tm_sec, alrm->time.tm_wday);
 433
 434         ret = s5m_rtc_stop_alarm(info);
 435         if (ret < 0)
 436                 return ret;
 437
 438         ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
 439         if (ret < 0)
 440                 return ret;
 441
 442         ret = s5m8767_rtc_set_alarm_reg(info);
 443         if (ret < 0)
 444                 return ret;
 445
 446         if (alrm->enabled)
 447                 ret = s5m_rtc_start_alarm(info);
 448
 449         return ret;
 450 }
 451
 452 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 453                                     unsigned int enabled)
 454 {
 455         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 456
 457         if (enabled)
 458                 return s5m_rtc_start_alarm(info);
 459         else
 460                 return s5m_rtc_stop_alarm(info);
 461 }
 462
 463 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 464 {
 465         struct s5m_rtc_info *info = data;
 466
 467         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 468
 469         return IRQ_HANDLED;
 470 }
 471
 472 static const struct rtc_class_ops s5m_rtc_ops = {
 473         .read_time = s5m_rtc_read_time,
 474         .set_time = s5m_rtc_set_time,
 475         .read_alarm = s5m_rtc_read_alarm,
 476         .set_alarm = s5m_rtc_set_alarm,
 477         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 478 };
 479
 480 static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
 481 {
 482         int ret;
 483         ret = regmap_update_bits(info->regmap, SEC_WTSR_SMPL_CNTL,
 484                                  WTSR_ENABLE_MASK,
 485                                  enable ? WTSR_ENABLE_MASK : 0);
 486         if (ret < 0)
 487                 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
 488                         __func__, ret);
 489 }
 490
 491 static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
 492 {
 493         int ret;
 494         ret = regmap_update_bits(info->regmap, SEC_WTSR_SMPL_CNTL,
 495                                  SMPL_ENABLE_MASK,
 496                                  enable ? SMPL_ENABLE_MASK : 0);
 497         if (ret < 0)
 498                 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
 499                         __func__, ret);
 500 }
 501
 502 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 503 {
 504         u8 data[2];
 505         unsigned int tp_read;
 506         int ret;
 507         struct rtc_time tm;
 508
 509         ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &tp_read);
 510         if (ret < 0) {
 511                 dev_err(info->dev, "%s: fail to read control reg(%d)\n",
 512                         __func__, ret);
 513                 return ret;
 514         }
 515
 516         /* Set RTC control register : Binary mode, 24hour mode */
 517         data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 518         data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 519
 520         info->rtc_24hr_mode = 1;
 521         ret = regmap_raw_write(info->regmap, SEC_ALARM0_CONF, data, 2);
 522         if (ret < 0) {
 523                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 524                         __func__, ret);
 525                 return ret;
 526         }
 527
 528         /* In first boot time, Set rtc time to 1/1/2012 00:00:00(SUN) */
 529         if ((tp_read & RTC_TCON_MASK) == 0) {
 530                 dev_dbg(info->dev, "rtc init\n");
 531                 tm.tm_sec = 0;
 532                 tm.tm_min = 0;
 533                 tm.tm_hour = 0;
 534                 tm.tm_wday = 0;
 535                 tm.tm_mday = 1;
 536                 tm.tm_mon = 0;
 537                 tm.tm_year = 112;
 538                 tm.tm_yday = 0;
 539                 tm.tm_isdst = 0;
 540                 ret = s5m_rtc_set_time(info->dev, &tm);
 541         }
 542
 543         ret = regmap_update_bits(info->regmap, SEC_RTC_UDR_CON,
 544                                  RTC_TCON_MASK, tp_read | RTC_TCON_MASK);
 545         if (ret < 0)
 546                 dev_err(info->dev, "%s: fail to update TCON reg(%d)\n",
 547                         __func__, ret);
 548
 549         return ret;
 550 }
 551
 552 static int s5m_rtc_probe(struct platform_device *pdev)
 553 {
 554         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 555         struct sec_platform_data *pdata = s5m87xx->pdata;
 556         struct s5m_rtc_info *info;
 557         int ret;
 558
 559         if (!pdata) {
 560                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 561                 return -ENODEV;
 562         }
 563
 564         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 565         if (!info)
 566                 return -ENOMEM;
 567
 568         info->dev = &pdev->dev;
 569         info->s5m87xx = s5m87xx;
 570         info->regmap = s5m87xx->regmap_rtc;
 571         info->device_type = s5m87xx->device_type;
 572         info->wtsr_smpl = s5m87xx->wtsr_smpl;
 573
 574         switch (pdata->device_type) {
 575         case S5M8763X:
 576                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
 577                                 S5M8763_IRQ_ALARM0);
 578                 break;
 579
 580         case S5M8767X:
 581                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
 582                                 S5M8767_IRQ_RTCA1);
 583                 break;
 584
 585         default:
 586                 ret = -EINVAL;
 587                 dev_err(&pdev->dev, "Unsupported device type: %d\n", ret);
 588                 return ret;
 589         }
 590
 591         platform_set_drvdata(pdev, info);
 592
 593         ret = s5m8767_rtc_init_reg(info);
 594
 595         if (info->wtsr_smpl) {
 596                 s5m_rtc_enable_wtsr(info, true);
 597                 s5m_rtc_enable_smpl(info, true);
 598         }
 599
 600         device_init_wakeup(&pdev->dev, 1);
 601
 602         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 603                                                  &s5m_rtc_ops, THIS_MODULE);
 604
 605         if (IS_ERR(info->rtc_dev))
 606                 return PTR_ERR(info->rtc_dev);
 607
 608         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 609                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 610                                         info);
 611         if (ret < 0)
 612                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 613                         info->irq, ret);
 614
 615         return ret;
 616 }
 617
 618 static void s5m_rtc_shutdown(struct platform_device *pdev)
 619 {
 620         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 621         int i;
 622         unsigned int val = 0;
 623         if (info->wtsr_smpl) {
 624                 for (i = 0; i < 3; i++) {
 625                         s5m_rtc_enable_wtsr(info, false);
 626                         regmap_read(info->regmap, SEC_WTSR_SMPL_CNTL, &val);
 627                         pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
 628                         if (val & WTSR_ENABLE_MASK)
 629                                 pr_emerg("%s: fail to disable WTSR\n",
 630                                          __func__);
 631                         else {
 632                                 pr_info("%s: success to disable WTSR\n",
 633                                         __func__);
 634                                 break;
 635                         }
 636                 }
 637         }
 638         /* Disable SMPL when power off */
 639         s5m_rtc_enable_smpl(info, false);
 640 }
 641
 642 static int s5m_rtc_resume(struct device *dev)
 643 {
 644         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 645         int ret = 0;
 646
 647         if (device_may_wakeup(dev))
 648                 ret = disable_irq_wake(info->irq);
 649
 650         return ret;
 651 }
 652
 653 static int s5m_rtc_suspend(struct device *dev)
 654 {
 655         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 656         int ret = 0;
 657
 658         if (device_may_wakeup(dev))
 659                 ret = enable_irq_wake(info->irq);
 660
 661         return ret;
 662 }
 663
 664 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 665
 666 static const struct platform_device_id s5m_rtc_id[] = {
 667         { "s5m-rtc", 0 },
 668 };
 669
 670 static struct platform_driver s5m_rtc_driver = {
 671         .driver         = {
 672                 .name   = "s5m-rtc",
 673                 .owner  = THIS_MODULE,
 674                 .pm     = &s5m_rtc_pm_ops,
 675         },
 676         .probe          = s5m_rtc_probe,
 677         .shutdown       = s5m_rtc_shutdown,
 678         .id_table       = s5m_rtc_id,
 679 };
 680
 681 module_platform_driver(s5m_rtc_driver);
 682
 683 /* Module information */
 684 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 685 MODULE_DESCRIPTION("Samsung S5M RTC driver");
 686 MODULE_LICENSE("GPL");
 687 MODULE_ALIAS("platform:s5m-rtc");