drivers/rtc/rtc-s5m.c

   1 /*
   2  * Copyright (c) 2011 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  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/i2c.h>
  24 #include <linux/slab.h>
  25 #include <linux/bcd.h>
  26 #include <linux/bitops.h>
  27 #include <linux/regmap.h>
  28 #include <linux/rtc.h>
  29 #include <linux/delay.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/mfd/s5m87xx/s5m-core.h>
  32 #include <linux/mfd/s5m87xx/s5m-rtc.h>
  33
  34 struct s5m_rtc_info {
  35         struct device *dev;
  36         struct s5m87xx_dev *s5m87xx;
  37         struct regmap *rtc;
  38         struct rtc_device *rtc_dev;
  39         int irq;
  40         int device_type;
  41         int rtc_24hr_mode;
  42         bool wtsr_smpl;
  43 };
  44
  45 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
  46                                int rtc_24hr_mode)
  47 {
  48         tm->tm_sec = data[RTC_SEC] & 0x7f;
  49         tm->tm_min = data[RTC_MIN] & 0x7f;
  50         if (rtc_24hr_mode)
  51                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
  52         else {
  53                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
  54                 if (data[RTC_HOUR] & HOUR_PM_MASK)
  55                         tm->tm_hour += 12;
  56         }
  57
  58         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
  59         tm->tm_mday = data[RTC_DATE] & 0x1f;
  60         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
  61         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
  62         tm->tm_yday = 0;
  63         tm->tm_isdst = 0;
  64 }
  65
  66 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
  67 {
  68         data[RTC_SEC] = tm->tm_sec;
  69         data[RTC_MIN] = tm->tm_min;
  70
  71         if (tm->tm_hour >= 12)
  72                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
  73         else
  74                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
  75
  76         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
  77         data[RTC_DATE] = tm->tm_mday;
  78         data[RTC_MONTH] = tm->tm_mon + 1;
  79         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0 ;
  80
  81         if (tm->tm_year < 100) {
  82                 printk(KERN_ERR
  83                        "s5m8767 RTC cannot handle the year %d.\n",
  84                        1900 + tm->tm_year);
  85                 return -EINVAL;
  86         } else {
  87                 return 0;
  88         }
  89 }
  90
  91 static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
  92 {
  93         int ret;
  94         unsigned int data;
  95
  96         ret = regmap_read(info->rtc, S5M87XX_RTC_UDR_CON, &data);
  97         if (ret < 0) {
  98                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
  99                         __func__, ret);
 100                 return ret;
 101         }
 102
 103         data |= RTC_TIME_EN_MASK;
 104         data |= RTC_UDR_MASK;
 105
 106         ret = regmap_write(info->rtc, S5M87XX_RTC_UDR_CON, data);
 107         if (ret < 0) {
 108                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 109                         __func__, ret);
 110                 return ret;
 111         }
 112
 113         do {
 114                 ret = regmap_read(info->rtc, S5M87XX_RTC_UDR_CON, &data);
 115         } while ((data & RTC_UDR_MASK) && !ret);
 116
 117         return ret;
 118 }
 119
 120 static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 121 {
 122         int ret;
 123         unsigned int data;
 124
 125         ret = regmap_read(info->rtc, S5M87XX_RTC_UDR_CON, &data);
 126         if (ret < 0) {
 127                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 128                         __func__, ret);
 129                 return ret;
 130         }
 131
 132         data &= ~RTC_TIME_EN_MASK;
 133         data |= RTC_UDR_MASK;
 134
 135         ret = regmap_write(info->rtc, S5M87XX_RTC_UDR_CON, data);
 136         if (ret < 0) {
 137                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 138                         __func__, ret);
 139                 return ret;
 140         }
 141
 142         do {
 143                 ret = regmap_read(info->rtc, S5M87XX_RTC_UDR_CON, &data);
 144         } while ((data & RTC_UDR_MASK) && !ret);
 145
 146         return ret;
 147 }
 148
 149 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 150 {
 151         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 152         tm->tm_min = bcd2bin(data[RTC_MIN]);
 153
 154         if (data[RTC_HOUR] & HOUR_12) {
 155                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 156                 if (data[RTC_HOUR] & HOUR_PM)
 157                         tm->tm_hour += 12;
 158         } else
 159                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 160
 161         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 162         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 163         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 164         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 165         tm->tm_year -= 1900;
 166 }
 167
 168 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 169 {
 170         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 171         data[RTC_MIN] = bin2bcd(tm->tm_min);
 172         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 173         data[RTC_WEEKDAY] = tm->tm_wday;
 174         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 175         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 176         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 177         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 178 }
 179
 180 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 181 {
 182         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 183         u8 data[8];
 184         int ret;
 185
 186         ret = regmap_bulk_read(info->rtc, S5M87XX_RTC_SEC, data, 8);
 187         if (ret < 0)
 188                 return ret;
 189
 190         switch (info->device_type) {
 191         case S5M8763X:
 192                 s5m8763_data_to_tm(data, tm);
 193                 break;
 194
 195         case S5M8767X:
 196                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 197                 break;
 198
 199         default:
 200                 return -EINVAL;
 201         }
 202
 203         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 204                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 205                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 206
 207         return rtc_valid_tm(tm);
 208 }
 209
 210 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 211 {
 212         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 213         u8 data[8];
 214         int ret = 0;
 215
 216         switch (info->device_type) {
 217         case S5M8763X:
 218                 s5m8763_tm_to_data(tm, data);
 219                 break;
 220         case S5M8767X:
 221                 ret = s5m8767_tm_to_data(tm, data);
 222                 break;
 223         default:
 224                 return -EINVAL;
 225         }
 226
 227         if (ret < 0)
 228                 return ret;
 229
 230         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 231                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 232                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 233
 234         ret = regmap_raw_write(info->rtc, S5M87XX_RTC_SEC, data, 8);
 235         if (ret < 0)
 236                 return ret;
 237
 238         ret = s5m8767_rtc_set_time_reg(info);
 239
 240         return ret;
 241 }
 242
 243 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 244 {
 245         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 246         u8 data[8];
 247         unsigned int val;
 248         int ret, i;
 249
 250         ret = regmap_bulk_read(info->rtc, S5M87XX_ALARM0_SEC, data, 8);
 251         if (ret < 0)
 252                 return ret;
 253
 254         switch (info->device_type) {
 255         case S5M8763X:
 256                 s5m8763_data_to_tm(data, &alrm->time);
 257                 ret = regmap_read(info->rtc, S5M87XX_ALARM0_CONF, &val);
 258                 if (ret < 0)
 259                         return ret;
 260
 261                 alrm->enabled = !!val;
 262
 263                 ret = regmap_read(info->rtc, S5M87XX_RTC_STATUS, &val);
 264                 if (ret < 0)
 265                         return ret;
 266
 267                 break;
 268
 269         case S5M8767X:
 270                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 271                 dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 272                         1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 273                         alrm->time.tm_mday, alrm->time.tm_hour,
 274                         alrm->time.tm_min, alrm->time.tm_sec,
 275                         alrm->time.tm_wday);
 276
 277                 alrm->enabled = 0;
 278                 for (i = 0; i < 7; i++) {
 279                         if (data[i] & ALARM_ENABLE_MASK) {
 280                                 alrm->enabled = 1;
 281                                 break;
 282                         }
 283                 }
 284
 285                 alrm->pending = 0;
 286                 ret = regmap_read(info->rtc, S5M87XX_RTC_STATUS, &val);
 287                 if (ret < 0)
 288                         return ret;
 289                 break;
 290
 291         default:
 292                 return -EINVAL;
 293         }
 294
 295         if (val & ALARM0_STATUS)
 296                 alrm->pending = 1;
 297         else
 298                 alrm->pending = 0;
 299
 300         return 0;
 301 }
 302
 303 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 304 {
 305         u8 data[8];
 306         int ret, i;
 307         struct rtc_time tm;
 308
 309         ret = regmap_bulk_read(info->rtc, S5M87XX_ALARM0_SEC, data, 8);
 310         if (ret < 0)
 311                 return ret;
 312
 313         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 314         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 315                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 316                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 317
 318         switch (info->device_type) {
 319         case S5M8763X:
 320                 ret = regmap_write(info->rtc, S5M87XX_ALARM0_CONF, 0);
 321                 break;
 322
 323         case S5M8767X:
 324                 for (i = 0; i < 7; i++)
 325                         data[i] &= ~ALARM_ENABLE_MASK;
 326
 327                 ret = regmap_raw_write(info->rtc, S5M87XX_ALARM0_SEC, data, 8);
 328                 if (ret < 0)
 329                         return ret;
 330
 331                 ret = s5m8767_rtc_set_alarm_reg(info);
 332
 333                 break;
 334
 335         default:
 336                 return -EINVAL;
 337         }
 338
 339         return ret;
 340 }
 341
 342 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 343 {
 344         int ret;
 345         u8 data[8];
 346         u8 alarm0_conf;
 347         struct rtc_time tm;
 348
 349         ret = regmap_bulk_read(info->rtc, S5M87XX_ALARM0_SEC, data, 8);
 350         if (ret < 0)
 351                 return ret;
 352
 353         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 354         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 355                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 356                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 357
 358         switch (info->device_type) {
 359         case S5M8763X:
 360                 alarm0_conf = 0x77;
 361                 ret = regmap_write(info->rtc, S5M87XX_ALARM0_CONF, alarm0_conf);
 362                 break;
 363
 364         case S5M8767X:
 365                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 366                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 367                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 368                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 369                 if (data[RTC_DATE] & 0x1f)
 370                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 371                 if (data[RTC_MONTH] & 0xf)
 372                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 373                 if (data[RTC_YEAR1] & 0x7f)
 374                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 375
 376                 ret = regmap_raw_write(info->rtc, S5M87XX_ALARM0_SEC, data, 8);
 377                 if (ret < 0)
 378                         return ret;
 379                 ret = s5m8767_rtc_set_alarm_reg(info);
 380
 381                 break;
 382
 383         default:
 384                 return -EINVAL;
 385         }
 386
 387         return ret;
 388 }
 389
 390 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 391 {
 392         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 393         u8 data[8];
 394         int ret;
 395
 396         switch (info->device_type) {
 397         case S5M8763X:
 398                 s5m8763_tm_to_data(&alrm->time, data);
 399                 break;
 400
 401         case S5M8767X:
 402                 s5m8767_tm_to_data(&alrm->time, data);
 403                 break;
 404
 405         default:
 406                 return -EINVAL;
 407         }
 408
 409         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 410                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 411                 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
 412                 alrm->time.tm_sec, alrm->time.tm_wday);
 413
 414         ret = s5m_rtc_stop_alarm(info);
 415         if (ret < 0)
 416                 return ret;
 417
 418         ret = regmap_raw_write(info->rtc, S5M87XX_ALARM0_SEC, data, 8);
 419         if (ret < 0)
 420                 return ret;
 421
 422         ret = s5m8767_rtc_set_alarm_reg(info);
 423         if (ret < 0)
 424                 return ret;
 425
 426         if (alrm->enabled)
 427                 ret = s5m_rtc_start_alarm(info);
 428
 429         return ret;
 430 }
 431
 432 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 433                                     unsigned int enabled)
 434 {
 435         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 436
 437         if (enabled)
 438                 return s5m_rtc_start_alarm(info);
 439         else
 440                 return s5m_rtc_stop_alarm(info);
 441 }
 442
 443 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 444 {
 445         struct s5m_rtc_info *info = data;
 446
 447         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 448
 449         return IRQ_HANDLED;
 450 }
 451
 452 static const struct rtc_class_ops s5m_rtc_ops = {
 453         .read_time = s5m_rtc_read_time,
 454         .set_time = s5m_rtc_set_time,
 455         .read_alarm = s5m_rtc_read_alarm,
 456         .set_alarm = s5m_rtc_set_alarm,
 457         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 458 };
 459
 460 static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
 461 {
 462         int ret;
 463         ret = regmap_update_bits(info->rtc, S5M87XX_WTSR_SMPL_CNTL,
 464                                  WTSR_ENABLE_MASK,
 465                                  enable ? WTSR_ENABLE_MASK : 0);
 466         if (ret < 0)
 467                 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
 468                         __func__, ret);
 469 }
 470
 471 static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
 472 {
 473         int ret;
 474         ret = regmap_update_bits(info->rtc, S5M87XX_WTSR_SMPL_CNTL,
 475                                  SMPL_ENABLE_MASK,
 476                                  enable ? SMPL_ENABLE_MASK : 0);
 477         if (ret < 0)
 478                 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
 479                         __func__, ret);
 480 }
 481
 482 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 483 {
 484         u8 data[2];
 485         unsigned int tp_read;
 486         int ret;
 487         struct rtc_time tm;
 488
 489         ret = regmap_read(info->rtc, S5M87XX_RTC_UDR_CON, &tp_read);
 490         if (ret < 0) {
 491                 dev_err(info->dev, "%s: fail to read control reg(%d)\n",
 492                         __func__, ret);
 493                 return ret;
 494         }
 495
 496         /* Set RTC control register : Binary mode, 24hour mode */
 497         data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 498         data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 499
 500         info->rtc_24hr_mode = 1;
 501         ret = regmap_raw_write(info->rtc, S5M87XX_ALARM0_CONF, data, 2);
 502         if (ret < 0) {
 503                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 504                         __func__, ret);
 505                 return ret;
 506         }
 507
 508         /* In first boot time, Set rtc time to 1/1/2012 00:00:00(SUN) */
 509         if ((tp_read & RTC_TCON_MASK) == 0) {
 510                 dev_dbg(info->dev, "rtc init\n");
 511                 tm.tm_sec = 0;
 512                 tm.tm_min = 0;
 513                 tm.tm_hour = 0;
 514                 tm.tm_wday = 0;
 515                 tm.tm_mday = 1;
 516                 tm.tm_mon = 0;
 517                 tm.tm_year = 112;
 518                 tm.tm_yday = 0;
 519                 tm.tm_isdst = 0;
 520                 ret = s5m_rtc_set_time(info->dev, &tm);
 521         }
 522
 523         ret = regmap_update_bits(info->rtc, S5M87XX_RTC_UDR_CON,
 524                                  RTC_TCON_MASK, tp_read | RTC_TCON_MASK);
 525         if (ret < 0)
 526                 dev_err(info->dev, "%s: fail to update TCON reg(%d)\n",
 527                         __func__, ret);
 528
 529         return ret;
 530 }
 531
 532 static int __devinit s5m_rtc_probe(struct platform_device *pdev)
 533 {
 534         struct s5m87xx_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 535         struct s5m_platform_data *pdata = s5m87xx->pdata;
 536         struct s5m_rtc_info *info;
 537         int ret;
 538
 539         if (!pdata) {
 540                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 541                 return -ENODEV;
 542         }
 543
 544         info = devm_kzalloc(&pdev->dev, sizeof(struct s5m_rtc_info),
 545                             GFP_KERNEL);
 546         if (!info)
 547                 return -ENOMEM;
 548
 549         info->dev = &pdev->dev;
 550         info->s5m87xx = s5m87xx;
 551         info->rtc = s5m87xx->rtc;
 552         info->device_type = s5m87xx->device_type;
 553         info->wtsr_smpl = s5m87xx->wtsr_smpl;
 554
 555         switch (pdata->device_type) {
 556         case S5M8763X:
 557                 info->irq = s5m87xx->irq_base + S5M8763_IRQ_ALARM0;
 558                 break;
 559
 560         case S5M8767X:
 561                 info->irq = s5m87xx->irq_base + S5M8767_IRQ_RTCA1;
 562                 break;
 563
 564         default:
 565                 ret = -EINVAL;
 566                 dev_err(&pdev->dev, "Unsupported device type: %d\n", ret);
 567                 return ret;
 568         }
 569
 570         platform_set_drvdata(pdev, info);
 571
 572         ret = s5m8767_rtc_init_reg(info);
 573
 574         if (info->wtsr_smpl) {
 575                 s5m_rtc_enable_wtsr(info, true);
 576                 s5m_rtc_enable_smpl(info, true);
 577         }
 578
 579         device_init_wakeup(&pdev->dev, 1);
 580
 581         info->rtc_dev = rtc_device_register("s5m-rtc", &pdev->dev,
 582                                             &s5m_rtc_ops, THIS_MODULE);
 583
 584         if (IS_ERR(info->rtc_dev)) {
 585                 ret = PTR_ERR(info->rtc_dev);
 586                 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
 587                 return ret;
 588         }
 589
 590         ret = request_threaded_irq(info->irq, NULL, s5m_rtc_alarm_irq, 0,
 591                                    "rtc-alarm0", info);
 592
 593         if (ret < 0)
 594                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 595                         info->irq, ret);
 596
 597         dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
 598
 599         return 0;
 600 }
 601
 602 static int __devexit s5m_rtc_remove(struct platform_device *pdev)
 603 {
 604         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 605
 606         if (info) {
 607                 free_irq(info->irq, info);
 608                 rtc_device_unregister(info->rtc_dev);
 609         }
 610
 611         return 0;
 612 }
 613
 614 static void s5m_rtc_shutdown(struct platform_device *pdev)
 615 {
 616         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 617         int i;
 618         unsigned int val = 0;
 619         if (info->wtsr_smpl) {
 620                 for (i = 0; i < 3; i++) {
 621                         s5m_rtc_enable_wtsr(info, false);
 622                         regmap_read(info->rtc, S5M87XX_WTSR_SMPL_CNTL, &val);
 623                         pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
 624                         if (val & WTSR_ENABLE_MASK)
 625                                 pr_emerg("%s: fail to disable WTSR\n",
 626                                          __func__);
 627                         else {
 628                                 pr_info("%s: success to disable WTSR\n",
 629                                         __func__);
 630                                 break;
 631                         }
 632                 }
 633         }
 634         /* Disable SMPL when power off */
 635         s5m_rtc_enable_smpl(info, false);
 636 }
 637
 638 static const struct platform_device_id s5m_rtc_id[] = {
 639         { "s5m-rtc", 0 },
 640 };
 641
 642 static struct platform_driver s5m_rtc_driver = {
 643         .driver         = {
 644                 .name   = "s5m-rtc",
 645                 .owner  = THIS_MODULE,
 646         },
 647         .probe          = s5m_rtc_probe,
 648         .remove         = __devexit_p(s5m_rtc_remove),
 649         .shutdown       = s5m_rtc_shutdown,
 650         .id_table       = s5m_rtc_id,
 651 };
 652
 653 module_platform_driver(s5m_rtc_driver);
 654
 655 /* Module information */
 656 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 657 MODULE_DESCRIPTION("Samsung S5M RTC driver");
 658 MODULE_LICENSE("GPL");
 659 MODULE_ALIAS("platform:s5m-rtc");