drivers/rtc/rtc-s5m.c

   1 /*
   2  * Copyright (c) 2013-2014 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/bcd.h>
  21 #include <linux/regmap.h>
  22 #include <linux/rtc.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/mfd/samsung/core.h>
  25 #include <linux/mfd/samsung/irq.h>
  26 #include <linux/mfd/samsung/rtc.h>
  27 #include <linux/mfd/samsung/s2mps14.h>
  28
  29 /*
  30  * Maximum number of retries for checking changes in UDR field
  31  * of S5M_RTC_UDR_CON register (to limit possible endless loop).
  32  *
  33  * After writing to RTC registers (setting time or alarm) read the UDR field
  34  * in S5M_RTC_UDR_CON register. UDR is auto-cleared when data have
  35  * been transferred.
  36  */
  37 #define UDR_READ_RETRY_CNT      5
  38
  39 /* Registers used by the driver which are different between chipsets. */
  40 struct s5m_rtc_reg_config {
  41         /* Number of registers used for setting time/alarm0/alarm1 */
  42         unsigned int regs_count;
  43         /* First register for time, seconds */
  44         unsigned int time;
  45         /* RTC control register */
  46         unsigned int ctrl;
  47         /* First register for alarm 0, seconds */
  48         unsigned int alarm0;
  49         /* First register for alarm 1, seconds */
  50         unsigned int alarm1;
  51         /* SMPL/WTSR register */
  52         unsigned int smpl_wtsr;
  53         /*
  54          * Register for update flag (UDR). Typically setting UDR field to 1
  55          * will enable update of time or alarm register. Then it will be
  56          * auto-cleared after successful update.
  57          */
  58         unsigned int rtc_udr_update;
  59         /* Mask for UDR field in 'rtc_udr_update' register */
  60         unsigned int rtc_udr_mask;
  61 };
  62
  63 /* Register map for S5M8763 and S5M8767 */
  64 static const struct s5m_rtc_reg_config s5m_rtc_regs = {
  65         .regs_count             = 8,
  66         .time                   = S5M_RTC_SEC,
  67         .ctrl                   = S5M_ALARM1_CONF,
  68         .alarm0                 = S5M_ALARM0_SEC,
  69         .alarm1                 = S5M_ALARM1_SEC,
  70         .smpl_wtsr              = S5M_WTSR_SMPL_CNTL,
  71         .rtc_udr_update         = S5M_RTC_UDR_CON,
  72         .rtc_udr_mask           = S5M_RTC_UDR_MASK,
  73 };
  74
  75 /*
  76  * Register map for S2MPS14.
  77  * It may be also suitable for S2MPS11 but this was not tested.
  78  */
  79 static const struct s5m_rtc_reg_config s2mps_rtc_regs = {
  80         .regs_count             = 7,
  81         .time                   = S2MPS_RTC_SEC,
  82         .ctrl                   = S2MPS_RTC_CTRL,
  83         .alarm0                 = S2MPS_ALARM0_SEC,
  84         .alarm1                 = S2MPS_ALARM1_SEC,
  85         .smpl_wtsr              = S2MPS_WTSR_SMPL_CNTL,
  86         .rtc_udr_update         = S2MPS_RTC_UDR_CON,
  87         .rtc_udr_mask           = S2MPS_RTC_WUDR_MASK,
  88 };
  89
  90 struct s5m_rtc_info {
  91         struct device *dev;
  92         struct i2c_client *i2c;
  93         struct sec_pmic_dev *s5m87xx;
  94         struct regmap *regmap;
  95         struct rtc_device *rtc_dev;
  96         int irq;
  97         int device_type;
  98         int rtc_24hr_mode;
  99         bool wtsr_smpl;
 100         const struct s5m_rtc_reg_config *regs;
 101 };
 102
 103 static const struct regmap_config s5m_rtc_regmap_config = {
 104         .reg_bits = 8,
 105         .val_bits = 8,
 106
 107         .max_register = S5M_RTC_REG_MAX,
 108 };
 109
 110 static const struct regmap_config s2mps14_rtc_regmap_config = {
 111         .reg_bits = 8,
 112         .val_bits = 8,
 113
 114         .max_register = S2MPS_RTC_REG_MAX,
 115 };
 116
 117 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
 118                                int rtc_24hr_mode)
 119 {
 120         tm->tm_sec = data[RTC_SEC] & 0x7f;
 121         tm->tm_min = data[RTC_MIN] & 0x7f;
 122         if (rtc_24hr_mode) {
 123                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
 124         } else {
 125                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
 126                 if (data[RTC_HOUR] & HOUR_PM_MASK)
 127                         tm->tm_hour += 12;
 128         }
 129
 130         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
 131         tm->tm_mday = data[RTC_DATE] & 0x1f;
 132         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
 133         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
 134         tm->tm_yday = 0;
 135         tm->tm_isdst = 0;
 136 }
 137
 138 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
 139 {
 140         data[RTC_SEC] = tm->tm_sec;
 141         data[RTC_MIN] = tm->tm_min;
 142
 143         if (tm->tm_hour >= 12)
 144                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
 145         else
 146                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
 147
 148         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
 149         data[RTC_DATE] = tm->tm_mday;
 150         data[RTC_MONTH] = tm->tm_mon + 1;
 151         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
 152
 153         if (tm->tm_year < 100) {
 154                 pr_err("s5m8767 RTC cannot handle the year %d.\n",
 155                        1900 + tm->tm_year);
 156                 return -EINVAL;
 157         } else {
 158                 return 0;
 159         }
 160 }
 161
 162 /*
 163  * Read RTC_UDR_CON register and wait till UDR field is cleared.
 164  * This indicates that time/alarm update ended.
 165  */
 166 static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 167 {
 168         int ret, retry = UDR_READ_RETRY_CNT;
 169         unsigned int data;
 170
 171         do {
 172                 ret = regmap_read(info->regmap, info->regs->rtc_udr_update,
 173                                 &data);
 174         } while (--retry && (data & info->regs->rtc_udr_mask) && !ret);
 175
 176         if (!retry)
 177                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 178
 179         return ret;
 180 }
 181
 182 static inline int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
 183                 struct rtc_wkalrm *alarm)
 184 {
 185         int ret;
 186         unsigned int val;
 187
 188         switch (info->device_type) {
 189         case S5M8767X:
 190         case S5M8763X:
 191                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 192                 val &= S5M_ALARM0_STATUS;
 193                 break;
 194         case S2MPS14X:
 195                 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
 196                                 &val);
 197                 val &= S2MPS_ALARM0_STATUS;
 198                 break;
 199         default:
 200                 return -EINVAL;
 201         }
 202         if (ret < 0)
 203                 return ret;
 204
 205         if (val)
 206                 alarm->pending = 1;
 207         else
 208                 alarm->pending = 0;
 209
 210         return 0;
 211 }
 212
 213 static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 214 {
 215         int ret;
 216         unsigned int data;
 217
 218         ret = regmap_read(info->regmap, info->regs->rtc_udr_update, &data);
 219         if (ret < 0) {
 220                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 221                 return ret;
 222         }
 223
 224         data |= info->regs->rtc_udr_mask;
 225         if (info->device_type == S5M8763X || info->device_type == S5M8767X)
 226                 data |= S5M_RTC_TIME_EN_MASK;
 227
 228         ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
 229         if (ret < 0) {
 230                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 231                 return ret;
 232         }
 233
 234         ret = s5m8767_wait_for_udr_update(info);
 235
 236         return ret;
 237 }
 238
 239 static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 240 {
 241         int ret;
 242         unsigned int data;
 243
 244         ret = regmap_read(info->regmap, info->regs->rtc_udr_update, &data);
 245         if (ret < 0) {
 246                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 247                         __func__, ret);
 248                 return ret;
 249         }
 250
 251         data |= info->regs->rtc_udr_mask;
 252         switch (info->device_type) {
 253         case S5M8763X:
 254         case S5M8767X:
 255                 data &= ~S5M_RTC_TIME_EN_MASK;
 256                 break;
 257         case S2MPS14X:
 258                 data |= S2MPS_RTC_RUDR_MASK;
 259                 break;
 260         default:
 261                 return -EINVAL;
 262         }
 263
 264         ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
 265         if (ret < 0) {
 266                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 267                         __func__, ret);
 268                 return ret;
 269         }
 270
 271         ret = s5m8767_wait_for_udr_update(info);
 272
 273         return ret;
 274 }
 275
 276 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 277 {
 278         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 279         tm->tm_min = bcd2bin(data[RTC_MIN]);
 280
 281         if (data[RTC_HOUR] & HOUR_12) {
 282                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 283                 if (data[RTC_HOUR] & HOUR_PM)
 284                         tm->tm_hour += 12;
 285         } else {
 286                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 287         }
 288
 289         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 290         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 291         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 292         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 293         tm->tm_year -= 1900;
 294 }
 295
 296 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 297 {
 298         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 299         data[RTC_MIN] = bin2bcd(tm->tm_min);
 300         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 301         data[RTC_WEEKDAY] = tm->tm_wday;
 302         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 303         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 304         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 305         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 306 }
 307
 308 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 309 {
 310         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 311         u8 data[info->regs->regs_count];
 312         int ret;
 313
 314         if (info->device_type == S2MPS14X) {
 315                 ret = regmap_update_bits(info->regmap,
 316                                 info->regs->rtc_udr_update,
 317                                 S2MPS_RTC_RUDR_MASK, S2MPS_RTC_RUDR_MASK);
 318                 if (ret) {
 319                         dev_err(dev,
 320                                 "Failed to prepare registers for time reading: %d\n",
 321                                 ret);
 322                         return ret;
 323                 }
 324         }
 325         ret = regmap_bulk_read(info->regmap, info->regs->time, data,
 326                         info->regs->regs_count);
 327         if (ret < 0)
 328                 return ret;
 329
 330         switch (info->device_type) {
 331         case S5M8763X:
 332                 s5m8763_data_to_tm(data, tm);
 333                 break;
 334
 335         case S5M8767X:
 336         case S2MPS14X:
 337                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 338                 break;
 339
 340         default:
 341                 return -EINVAL;
 342         }
 343
 344         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 345                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 346                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 347
 348         return rtc_valid_tm(tm);
 349 }
 350
 351 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 352 {
 353         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 354         u8 data[info->regs->regs_count];
 355         int ret = 0;
 356
 357         switch (info->device_type) {
 358         case S5M8763X:
 359                 s5m8763_tm_to_data(tm, data);
 360                 break;
 361         case S5M8767X:
 362         case S2MPS14X:
 363                 ret = s5m8767_tm_to_data(tm, data);
 364                 break;
 365         default:
 366                 return -EINVAL;
 367         }
 368
 369         if (ret < 0)
 370                 return ret;
 371
 372         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 373                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 374                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 375
 376         ret = regmap_raw_write(info->regmap, info->regs->time, data,
 377                         info->regs->regs_count);
 378         if (ret < 0)
 379                 return ret;
 380
 381         ret = s5m8767_rtc_set_time_reg(info);
 382
 383         return ret;
 384 }
 385
 386 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 387 {
 388         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 389         u8 data[info->regs->regs_count];
 390         unsigned int val;
 391         int ret, i;
 392
 393         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 394                         info->regs->regs_count);
 395         if (ret < 0)
 396                 return ret;
 397
 398         switch (info->device_type) {
 399         case S5M8763X:
 400                 s5m8763_data_to_tm(data, &alrm->time);
 401                 ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
 402                 if (ret < 0)
 403                         return ret;
 404
 405                 alrm->enabled = !!val;
 406                 break;
 407
 408         case S5M8767X:
 409         case S2MPS14X:
 410                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 411                 alrm->enabled = 0;
 412                 for (i = 0; i < info->regs->regs_count; i++) {
 413                         if (data[i] & ALARM_ENABLE_MASK) {
 414                                 alrm->enabled = 1;
 415                                 break;
 416                         }
 417                 }
 418                 break;
 419
 420         default:
 421                 return -EINVAL;
 422         }
 423
 424         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 425                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 426                 alrm->time.tm_mday, alrm->time.tm_hour,
 427                 alrm->time.tm_min, alrm->time.tm_sec,
 428                 alrm->time.tm_wday);
 429
 430         ret = s5m_check_peding_alarm_interrupt(info, alrm);
 431
 432         return 0;
 433 }
 434
 435 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 436 {
 437         u8 data[info->regs->regs_count];
 438         int ret, i;
 439         struct rtc_time tm;
 440
 441         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 442                         info->regs->regs_count);
 443         if (ret < 0)
 444                 return ret;
 445
 446         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 447         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 448                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 449                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 450
 451         switch (info->device_type) {
 452         case S5M8763X:
 453                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
 454                 break;
 455
 456         case S5M8767X:
 457         case S2MPS14X:
 458                 for (i = 0; i < info->regs->regs_count; i++)
 459                         data[i] &= ~ALARM_ENABLE_MASK;
 460
 461                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 462                                 info->regs->regs_count);
 463                 if (ret < 0)
 464                         return ret;
 465
 466                 ret = s5m8767_rtc_set_alarm_reg(info);
 467
 468                 break;
 469
 470         default:
 471                 return -EINVAL;
 472         }
 473
 474         return ret;
 475 }
 476
 477 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 478 {
 479         int ret;
 480         u8 data[info->regs->regs_count];
 481         u8 alarm0_conf;
 482         struct rtc_time tm;
 483
 484         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 485                         info->regs->regs_count);
 486         if (ret < 0)
 487                 return ret;
 488
 489         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 490         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 491                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 492                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 493
 494         switch (info->device_type) {
 495         case S5M8763X:
 496                 alarm0_conf = 0x77;
 497                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
 498                 break;
 499
 500         case S5M8767X:
 501         case S2MPS14X:
 502                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 503                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 504                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 505                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 506                 if (data[RTC_DATE] & 0x1f)
 507                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 508                 if (data[RTC_MONTH] & 0xf)
 509                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 510                 if (data[RTC_YEAR1] & 0x7f)
 511                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 512
 513                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 514                                 info->regs->regs_count);
 515                 if (ret < 0)
 516                         return ret;
 517                 ret = s5m8767_rtc_set_alarm_reg(info);
 518
 519                 break;
 520
 521         default:
 522                 return -EINVAL;
 523         }
 524
 525         return ret;
 526 }
 527
 528 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 529 {
 530         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 531         u8 data[info->regs->regs_count];
 532         int ret;
 533
 534         switch (info->device_type) {
 535         case S5M8763X:
 536                 s5m8763_tm_to_data(&alrm->time, data);
 537                 break;
 538
 539         case S5M8767X:
 540         case S2MPS14X:
 541                 s5m8767_tm_to_data(&alrm->time, data);
 542                 break;
 543
 544         default:
 545                 return -EINVAL;
 546         }
 547
 548         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 549                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 550                 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
 551                 alrm->time.tm_sec, alrm->time.tm_wday);
 552
 553         ret = s5m_rtc_stop_alarm(info);
 554         if (ret < 0)
 555                 return ret;
 556
 557         ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 558                         info->regs->regs_count);
 559         if (ret < 0)
 560                 return ret;
 561
 562         ret = s5m8767_rtc_set_alarm_reg(info);
 563         if (ret < 0)
 564                 return ret;
 565
 566         if (alrm->enabled)
 567                 ret = s5m_rtc_start_alarm(info);
 568
 569         return ret;
 570 }
 571
 572 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 573                                     unsigned int enabled)
 574 {
 575         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 576
 577         if (enabled)
 578                 return s5m_rtc_start_alarm(info);
 579         else
 580                 return s5m_rtc_stop_alarm(info);
 581 }
 582
 583 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 584 {
 585         struct s5m_rtc_info *info = data;
 586
 587         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 588
 589         return IRQ_HANDLED;
 590 }
 591
 592 static const struct rtc_class_ops s5m_rtc_ops = {
 593         .read_time = s5m_rtc_read_time,
 594         .set_time = s5m_rtc_set_time,
 595         .read_alarm = s5m_rtc_read_alarm,
 596         .set_alarm = s5m_rtc_set_alarm,
 597         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 598 };
 599
 600 static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
 601 {
 602         int ret;
 603         ret = regmap_update_bits(info->regmap, info->regs->smpl_wtsr,
 604                                  WTSR_ENABLE_MASK,
 605                                  enable ? WTSR_ENABLE_MASK : 0);
 606         if (ret < 0)
 607                 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
 608                         __func__, ret);
 609 }
 610
 611 static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
 612 {
 613         int ret;
 614         ret = regmap_update_bits(info->regmap, info->regs->smpl_wtsr,
 615                                  SMPL_ENABLE_MASK,
 616                                  enable ? SMPL_ENABLE_MASK : 0);
 617         if (ret < 0)
 618                 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
 619                         __func__, ret);
 620 }
 621
 622 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 623 {
 624         u8 data[2];
 625         int ret;
 626
 627         switch (info->device_type) {
 628         case S5M8763X:
 629         case S5M8767X:
 630                 /* UDR update time. Default of 7.32 ms is too long. */
 631                 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
 632                                 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
 633                 if (ret < 0)
 634                         dev_err(info->dev, "%s: fail to change UDR time: %d\n",
 635                                         __func__, ret);
 636
 637                 /* Set RTC control register : Binary mode, 24hour mode */
 638                 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 639                 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 640
 641                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 642                 break;
 643
 644         case S2MPS14X:
 645                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 646                 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 647                 break;
 648
 649         default:
 650                 return -EINVAL;
 651         }
 652
 653         info->rtc_24hr_mode = 1;
 654         if (ret < 0) {
 655                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 656                         __func__, ret);
 657                 return ret;
 658         }
 659
 660         return ret;
 661 }
 662
 663 static int s5m_rtc_probe(struct platform_device *pdev)
 664 {
 665         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 666         struct sec_platform_data *pdata = s5m87xx->pdata;
 667         struct s5m_rtc_info *info;
 668         const struct regmap_config *regmap_cfg;
 669         int ret, alarm_irq;
 670
 671         if (!pdata) {
 672                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 673                 return -ENODEV;
 674         }
 675
 676         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 677         if (!info)
 678                 return -ENOMEM;
 679
 680         switch (pdata->device_type) {
 681         case S2MPS14X:
 682                 regmap_cfg = &s2mps14_rtc_regmap_config;
 683                 info->regs = &s2mps_rtc_regs;
 684                 alarm_irq = S2MPS14_IRQ_RTCA0;
 685                 break;
 686         case S5M8763X:
 687                 regmap_cfg = &s5m_rtc_regmap_config;
 688                 info->regs = &s5m_rtc_regs;
 689                 alarm_irq = S5M8763_IRQ_ALARM0;
 690                 break;
 691         case S5M8767X:
 692                 regmap_cfg = &s5m_rtc_regmap_config;
 693                 info->regs = &s5m_rtc_regs;
 694                 alarm_irq = S5M8767_IRQ_RTCA1;
 695                 break;
 696         default:
 697                 dev_err(&pdev->dev, "Device type is not supported by RTC driver\n");
 698                 return -ENODEV;
 699         }
 700
 701         info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
 702         if (!info->i2c) {
 703                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 704                 return -ENODEV;
 705         }
 706
 707         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 708         if (IS_ERR(info->regmap)) {
 709                 ret = PTR_ERR(info->regmap);
 710                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 711                                 ret);
 712                 goto err;
 713         }
 714
 715         info->dev = &pdev->dev;
 716         info->s5m87xx = s5m87xx;
 717         info->device_type = s5m87xx->device_type;
 718         info->wtsr_smpl = s5m87xx->wtsr_smpl;
 719
 720         if (s5m87xx->irq_data) {
 721                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 722                 if (info->irq <= 0) {
 723                         ret = -EINVAL;
 724                         dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 725                                 alarm_irq);
 726                         goto err;
 727                 }
 728         }
 729
 730         platform_set_drvdata(pdev, info);
 731
 732         ret = s5m8767_rtc_init_reg(info);
 733
 734         if (info->wtsr_smpl) {
 735                 s5m_rtc_enable_wtsr(info, true);
 736                 s5m_rtc_enable_smpl(info, true);
 737         }
 738
 739         device_init_wakeup(&pdev->dev, 1);
 740
 741         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 742                                                  &s5m_rtc_ops, THIS_MODULE);
 743
 744         if (IS_ERR(info->rtc_dev)) {
 745                 ret = PTR_ERR(info->rtc_dev);
 746                 goto err;
 747         }
 748
 749         if (!info->irq) {
 750                 dev_info(&pdev->dev, "Alarm IRQ not available\n");
 751                 return 0;
 752         }
 753
 754         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 755                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 756                                         info);
 757         if (ret < 0) {
 758                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 759                         info->irq, ret);
 760                 goto err;
 761         }
 762
 763         return 0;
 764
 765 err:
 766         i2c_unregister_device(info->i2c);
 767
 768         return ret;
 769 }
 770
 771 static void s5m_rtc_shutdown(struct platform_device *pdev)
 772 {
 773         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 774         int i;
 775         unsigned int val = 0;
 776         if (info->wtsr_smpl) {
 777                 for (i = 0; i < 3; i++) {
 778                         s5m_rtc_enable_wtsr(info, false);
 779                         regmap_read(info->regmap, info->regs->smpl_wtsr, &val);
 780                         pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
 781                         if (val & WTSR_ENABLE_MASK)
 782                                 pr_emerg("%s: fail to disable WTSR\n",
 783                                          __func__);
 784                         else {
 785                                 pr_info("%s: success to disable WTSR\n",
 786                                         __func__);
 787                                 break;
 788                         }
 789                 }
 790         }
 791         /* Disable SMPL when power off */
 792         s5m_rtc_enable_smpl(info, false);
 793 }
 794
 795 static int s5m_rtc_remove(struct platform_device *pdev)
 796 {
 797         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 798
 799         /* Perform also all shutdown steps when removing */
 800         s5m_rtc_shutdown(pdev);
 801         i2c_unregister_device(info->i2c);
 802
 803         return 0;
 804 }
 805
 806 #ifdef CONFIG_PM_SLEEP
 807 static int s5m_rtc_resume(struct device *dev)
 808 {
 809         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 810         int ret = 0;
 811
 812         if (info->irq && device_may_wakeup(dev))
 813                 ret = disable_irq_wake(info->irq);
 814
 815         return ret;
 816 }
 817
 818 static int s5m_rtc_suspend(struct device *dev)
 819 {
 820         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 821         int ret = 0;
 822
 823         if (info->irq && device_may_wakeup(dev))
 824                 ret = enable_irq_wake(info->irq);
 825
 826         return ret;
 827 }
 828 #endif /* CONFIG_PM_SLEEP */
 829
 830 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 831
 832 static const struct platform_device_id s5m_rtc_id[] = {
 833         { "s5m-rtc",            S5M8767X },
 834         { "s2mps14-rtc",        S2MPS14X },
 835         { },
 836 };
 837
 838 static struct platform_driver s5m_rtc_driver = {
 839         .driver         = {
 840                 .name   = "s5m-rtc",
 841                 .pm     = &s5m_rtc_pm_ops,
 842         },
 843         .probe          = s5m_rtc_probe,
 844         .remove         = s5m_rtc_remove,
 845         .shutdown       = s5m_rtc_shutdown,
 846         .id_table       = s5m_rtc_id,
 847 };
 848
 849 module_platform_driver(s5m_rtc_driver);
 850
 851 /* Module information */
 852 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 853 MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
 854 MODULE_LICENSE("GPL");
 855 MODULE_ALIAS("platform:s5m-rtc");