drivers/rtc/rtc-s5m.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright (c) 2013-2014 Samsung Electronics Co., Ltd
   4 //      http://www.samsung.com
   5 //
   6 //  Copyright (C) 2013 Google, Inc
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/module.h>
  11 #include <linux/i2c.h>
  12 #include <linux/bcd.h>
  13 #include <linux/regmap.h>
  14 #include <linux/rtc.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mfd/samsung/core.h>
  17 #include <linux/mfd/samsung/irq.h>
  18 #include <linux/mfd/samsung/rtc.h>
  19 #include <linux/mfd/samsung/s2mps14.h>
  20
  21 /*
  22  * Maximum number of retries for checking changes in UDR field
  23  * of S5M_RTC_UDR_CON register (to limit possible endless loop).
  24  *
  25  * After writing to RTC registers (setting time or alarm) read the UDR field
  26  * in S5M_RTC_UDR_CON register. UDR is auto-cleared when data have
  27  * been transferred.
  28  */
  29 #define UDR_READ_RETRY_CNT      5
  30
  31 enum {
  32         RTC_SEC = 0,
  33         RTC_MIN,
  34         RTC_HOUR,
  35         RTC_WEEKDAY,
  36         RTC_DATE,
  37         RTC_MONTH,
  38         RTC_YEAR1,
  39         RTC_YEAR2,
  40         /* Make sure this is always the last enum name. */
  41         RTC_MAX_NUM_TIME_REGS
  42 };
  43
  44 /*
  45  * Registers used by the driver which are different between chipsets.
  46  *
  47  * Operations like read time and write alarm/time require updating
  48  * specific fields in UDR register. These fields usually are auto-cleared
  49  * (with some exceptions).
  50  *
  51  * Table of operations per device:
  52  *
  53  * Device     | Write time | Read time | Write alarm
  54  * =================================================
  55  * S5M8767    | UDR + TIME |           | UDR
  56  * S2MPS11/14 | WUDR       | RUDR      | WUDR + RUDR
  57  * S2MPS13    | WUDR       | RUDR      | WUDR + AUDR
  58  * S2MPS15    | WUDR       | RUDR      | AUDR
  59  */
  60 struct s5m_rtc_reg_config {
  61         /* Number of registers used for setting time/alarm0/alarm1 */
  62         unsigned int regs_count;
  63         /* First register for time, seconds */
  64         unsigned int time;
  65         /* RTC control register */
  66         unsigned int ctrl;
  67         /* First register for alarm 0, seconds */
  68         unsigned int alarm0;
  69         /* First register for alarm 1, seconds */
  70         unsigned int alarm1;
  71         /*
  72          * Register for update flag (UDR). Typically setting UDR field to 1
  73          * will enable update of time or alarm register. Then it will be
  74          * auto-cleared after successful update.
  75          */
  76         unsigned int udr_update;
  77         /* Auto-cleared mask in UDR field for writing time and alarm */
  78         unsigned int autoclear_udr_mask;
  79         /*
  80          * Masks in UDR field for time and alarm operations.
  81          * The read time mask can be 0. Rest should not.
  82          */
  83         unsigned int read_time_udr_mask;
  84         unsigned int write_time_udr_mask;
  85         unsigned int write_alarm_udr_mask;
  86 };
  87
  88 /* Register map for S5M8763 and S5M8767 */
  89 static const struct s5m_rtc_reg_config s5m_rtc_regs = {
  90         .regs_count             = 8,
  91         .time                   = S5M_RTC_SEC,
  92         .ctrl                   = S5M_ALARM1_CONF,
  93         .alarm0                 = S5M_ALARM0_SEC,
  94         .alarm1                 = S5M_ALARM1_SEC,
  95         .udr_update             = S5M_RTC_UDR_CON,
  96         .autoclear_udr_mask     = S5M_RTC_UDR_MASK,
  97         .read_time_udr_mask     = 0, /* Not needed */
  98         .write_time_udr_mask    = S5M_RTC_UDR_MASK | S5M_RTC_TIME_EN_MASK,
  99         .write_alarm_udr_mask   = S5M_RTC_UDR_MASK,
 100 };
 101
 102 /* Register map for S2MPS13 */
 103 static const struct s5m_rtc_reg_config s2mps13_rtc_regs = {
 104         .regs_count             = 7,
 105         .time                   = S2MPS_RTC_SEC,
 106         .ctrl                   = S2MPS_RTC_CTRL,
 107         .alarm0                 = S2MPS_ALARM0_SEC,
 108         .alarm1                 = S2MPS_ALARM1_SEC,
 109         .udr_update             = S2MPS_RTC_UDR_CON,
 110         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 111         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 112         .write_time_udr_mask    = S2MPS_RTC_WUDR_MASK,
 113         .write_alarm_udr_mask   = S2MPS_RTC_WUDR_MASK | S2MPS13_RTC_AUDR_MASK,
 114 };
 115
 116 /* Register map for S2MPS11/14 */
 117 static const struct s5m_rtc_reg_config s2mps14_rtc_regs = {
 118         .regs_count             = 7,
 119         .time                   = S2MPS_RTC_SEC,
 120         .ctrl                   = S2MPS_RTC_CTRL,
 121         .alarm0                 = S2MPS_ALARM0_SEC,
 122         .alarm1                 = S2MPS_ALARM1_SEC,
 123         .udr_update             = S2MPS_RTC_UDR_CON,
 124         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 125         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 126         .write_time_udr_mask    = S2MPS_RTC_WUDR_MASK,
 127         .write_alarm_udr_mask   = S2MPS_RTC_WUDR_MASK | S2MPS_RTC_RUDR_MASK,
 128 };
 129
 130 /*
 131  * Register map for S2MPS15 - in comparison to S2MPS14 the WUDR and AUDR bits
 132  * are swapped.
 133  */
 134 static const struct s5m_rtc_reg_config s2mps15_rtc_regs = {
 135         .regs_count             = 7,
 136         .time                   = S2MPS_RTC_SEC,
 137         .ctrl                   = S2MPS_RTC_CTRL,
 138         .alarm0                 = S2MPS_ALARM0_SEC,
 139         .alarm1                 = S2MPS_ALARM1_SEC,
 140         .udr_update             = S2MPS_RTC_UDR_CON,
 141         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 142         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 143         .write_time_udr_mask    = S2MPS15_RTC_WUDR_MASK,
 144         .write_alarm_udr_mask   = S2MPS15_RTC_AUDR_MASK,
 145 };
 146
 147 struct s5m_rtc_info {
 148         struct device *dev;
 149         struct i2c_client *i2c;
 150         struct sec_pmic_dev *s5m87xx;
 151         struct regmap *regmap;
 152         struct rtc_device *rtc_dev;
 153         int irq;
 154         enum sec_device_type device_type;
 155         int rtc_24hr_mode;
 156         const struct s5m_rtc_reg_config *regs;
 157 };
 158
 159 static const struct regmap_config s5m_rtc_regmap_config = {
 160         .reg_bits = 8,
 161         .val_bits = 8,
 162
 163         .max_register = S5M_RTC_REG_MAX,
 164 };
 165
 166 static const struct regmap_config s2mps14_rtc_regmap_config = {
 167         .reg_bits = 8,
 168         .val_bits = 8,
 169
 170         .max_register = S2MPS_RTC_REG_MAX,
 171 };
 172
 173 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
 174                                int rtc_24hr_mode)
 175 {
 176         tm->tm_sec = data[RTC_SEC] & 0x7f;
 177         tm->tm_min = data[RTC_MIN] & 0x7f;
 178         if (rtc_24hr_mode) {
 179                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
 180         } else {
 181                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
 182                 if (data[RTC_HOUR] & HOUR_PM_MASK)
 183                         tm->tm_hour += 12;
 184         }
 185
 186         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
 187         tm->tm_mday = data[RTC_DATE] & 0x1f;
 188         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
 189         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
 190         tm->tm_yday = 0;
 191         tm->tm_isdst = 0;
 192 }
 193
 194 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
 195 {
 196         data[RTC_SEC] = tm->tm_sec;
 197         data[RTC_MIN] = tm->tm_min;
 198
 199         if (tm->tm_hour >= 12)
 200                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
 201         else
 202                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
 203
 204         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
 205         data[RTC_DATE] = tm->tm_mday;
 206         data[RTC_MONTH] = tm->tm_mon + 1;
 207         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
 208
 209         if (tm->tm_year < 100) {
 210                 pr_err("RTC cannot handle the year %d\n",
 211                        1900 + tm->tm_year);
 212                 return -EINVAL;
 213         } else {
 214                 return 0;
 215         }
 216 }
 217
 218 /*
 219  * Read RTC_UDR_CON register and wait till UDR field is cleared.
 220  * This indicates that time/alarm update ended.
 221  */
 222 static int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 223 {
 224         int ret, retry = UDR_READ_RETRY_CNT;
 225         unsigned int data;
 226
 227         do {
 228                 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 229         } while (--retry && (data & info->regs->autoclear_udr_mask) && !ret);
 230
 231         if (!retry)
 232                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 233
 234         return ret;
 235 }
 236
 237 static int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
 238                 struct rtc_wkalrm *alarm)
 239 {
 240         int ret;
 241         unsigned int val;
 242
 243         switch (info->device_type) {
 244         case S5M8767X:
 245         case S5M8763X:
 246                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 247                 val &= S5M_ALARM0_STATUS;
 248                 break;
 249         case S2MPS15X:
 250         case S2MPS14X:
 251         case S2MPS13X:
 252                 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
 253                                 &val);
 254                 val &= S2MPS_ALARM0_STATUS;
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259         if (ret < 0)
 260                 return ret;
 261
 262         if (val)
 263                 alarm->pending = 1;
 264         else
 265                 alarm->pending = 0;
 266
 267         return 0;
 268 }
 269
 270 static int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 271 {
 272         int ret;
 273         unsigned int data;
 274
 275         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 276         if (ret < 0) {
 277                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 278                 return ret;
 279         }
 280
 281         data |= info->regs->write_time_udr_mask;
 282
 283         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 284         if (ret < 0) {
 285                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 286                 return ret;
 287         }
 288
 289         ret = s5m8767_wait_for_udr_update(info);
 290
 291         return ret;
 292 }
 293
 294 static int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 295 {
 296         int ret;
 297         unsigned int data;
 298
 299         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 300         if (ret < 0) {
 301                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 302                         __func__, ret);
 303                 return ret;
 304         }
 305
 306         data |= info->regs->write_alarm_udr_mask;
 307         switch (info->device_type) {
 308         case S5M8763X:
 309         case S5M8767X:
 310                 data &= ~S5M_RTC_TIME_EN_MASK;
 311                 break;
 312         case S2MPS15X:
 313         case S2MPS14X:
 314         case S2MPS13X:
 315                 /* No exceptions needed */
 316                 break;
 317         default:
 318                 return -EINVAL;
 319         }
 320
 321         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 322         if (ret < 0) {
 323                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 324                         __func__, ret);
 325                 return ret;
 326         }
 327
 328         ret = s5m8767_wait_for_udr_update(info);
 329
 330         /* On S2MPS13 the AUDR is not auto-cleared */
 331         if (info->device_type == S2MPS13X)
 332                 regmap_update_bits(info->regmap, info->regs->udr_update,
 333                                    S2MPS13_RTC_AUDR_MASK, 0);
 334
 335         return ret;
 336 }
 337
 338 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 339 {
 340         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 341         tm->tm_min = bcd2bin(data[RTC_MIN]);
 342
 343         if (data[RTC_HOUR] & HOUR_12) {
 344                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 345                 if (data[RTC_HOUR] & HOUR_PM)
 346                         tm->tm_hour += 12;
 347         } else {
 348                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 349         }
 350
 351         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 352         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 353         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 354         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 355         tm->tm_year -= 1900;
 356 }
 357
 358 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 359 {
 360         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 361         data[RTC_MIN] = bin2bcd(tm->tm_min);
 362         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 363         data[RTC_WEEKDAY] = tm->tm_wday;
 364         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 365         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 366         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 367         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 368 }
 369
 370 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 371 {
 372         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 373         u8 data[RTC_MAX_NUM_TIME_REGS];
 374         int ret;
 375
 376         if (info->regs->read_time_udr_mask) {
 377                 ret = regmap_update_bits(info->regmap,
 378                                 info->regs->udr_update,
 379                                 info->regs->read_time_udr_mask,
 380                                 info->regs->read_time_udr_mask);
 381                 if (ret) {
 382                         dev_err(dev,
 383                                 "Failed to prepare registers for time reading: %d\n",
 384                                 ret);
 385                         return ret;
 386                 }
 387         }
 388         ret = regmap_bulk_read(info->regmap, info->regs->time, data,
 389                         info->regs->regs_count);
 390         if (ret < 0)
 391                 return ret;
 392
 393         switch (info->device_type) {
 394         case S5M8763X:
 395                 s5m8763_data_to_tm(data, tm);
 396                 break;
 397
 398         case S5M8767X:
 399         case S2MPS15X:
 400         case S2MPS14X:
 401         case S2MPS13X:
 402                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 403                 break;
 404
 405         default:
 406                 return -EINVAL;
 407         }
 408
 409         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, tm, tm->tm_wday);
 410
 411         return 0;
 412 }
 413
 414 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 415 {
 416         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 417         u8 data[RTC_MAX_NUM_TIME_REGS];
 418         int ret = 0;
 419
 420         switch (info->device_type) {
 421         case S5M8763X:
 422                 s5m8763_tm_to_data(tm, data);
 423                 break;
 424         case S5M8767X:
 425         case S2MPS15X:
 426         case S2MPS14X:
 427         case S2MPS13X:
 428                 ret = s5m8767_tm_to_data(tm, data);
 429                 break;
 430         default:
 431                 return -EINVAL;
 432         }
 433
 434         if (ret < 0)
 435                 return ret;
 436
 437         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, tm, tm->tm_wday);
 438
 439         ret = regmap_raw_write(info->regmap, info->regs->time, data,
 440                         info->regs->regs_count);
 441         if (ret < 0)
 442                 return ret;
 443
 444         ret = s5m8767_rtc_set_time_reg(info);
 445
 446         return ret;
 447 }
 448
 449 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 450 {
 451         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 452         u8 data[RTC_MAX_NUM_TIME_REGS];
 453         unsigned int val;
 454         int ret, i;
 455
 456         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 457                         info->regs->regs_count);
 458         if (ret < 0)
 459                 return ret;
 460
 461         switch (info->device_type) {
 462         case S5M8763X:
 463                 s5m8763_data_to_tm(data, &alrm->time);
 464                 ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
 465                 if (ret < 0)
 466                         return ret;
 467
 468                 alrm->enabled = !!val;
 469                 break;
 470
 471         case S5M8767X:
 472         case S2MPS15X:
 473         case S2MPS14X:
 474         case S2MPS13X:
 475                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 476                 alrm->enabled = 0;
 477                 for (i = 0; i < info->regs->regs_count; i++) {
 478                         if (data[i] & ALARM_ENABLE_MASK) {
 479                                 alrm->enabled = 1;
 480                                 break;
 481                         }
 482                 }
 483                 break;
 484
 485         default:
 486                 return -EINVAL;
 487         }
 488
 489         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, &alrm->time, alrm->time.tm_wday);
 490
 491         ret = s5m_check_peding_alarm_interrupt(info, alrm);
 492
 493         return 0;
 494 }
 495
 496 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 497 {
 498         u8 data[RTC_MAX_NUM_TIME_REGS];
 499         int ret, i;
 500         struct rtc_time tm;
 501
 502         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 503                         info->regs->regs_count);
 504         if (ret < 0)
 505                 return ret;
 506
 507         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 508         dev_dbg(info->dev, "%s: %ptR(%d)\n", __func__, &tm, tm.tm_wday);
 509
 510         switch (info->device_type) {
 511         case S5M8763X:
 512                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
 513                 break;
 514
 515         case S5M8767X:
 516         case S2MPS15X:
 517         case S2MPS14X:
 518         case S2MPS13X:
 519                 for (i = 0; i < info->regs->regs_count; i++)
 520                         data[i] &= ~ALARM_ENABLE_MASK;
 521
 522                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 523                                 info->regs->regs_count);
 524                 if (ret < 0)
 525                         return ret;
 526
 527                 ret = s5m8767_rtc_set_alarm_reg(info);
 528
 529                 break;
 530
 531         default:
 532                 return -EINVAL;
 533         }
 534
 535         return ret;
 536 }
 537
 538 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 539 {
 540         int ret;
 541         u8 data[RTC_MAX_NUM_TIME_REGS];
 542         u8 alarm0_conf;
 543         struct rtc_time tm;
 544
 545         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 546                         info->regs->regs_count);
 547         if (ret < 0)
 548                 return ret;
 549
 550         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 551         dev_dbg(info->dev, "%s: %ptR(%d)\n", __func__, &tm, tm.tm_wday);
 552
 553         switch (info->device_type) {
 554         case S5M8763X:
 555                 alarm0_conf = 0x77;
 556                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
 557                 break;
 558
 559         case S5M8767X:
 560         case S2MPS15X:
 561         case S2MPS14X:
 562         case S2MPS13X:
 563                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 564                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 565                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 566                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 567                 if (data[RTC_DATE] & 0x1f)
 568                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 569                 if (data[RTC_MONTH] & 0xf)
 570                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 571                 if (data[RTC_YEAR1] & 0x7f)
 572                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 573
 574                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 575                                 info->regs->regs_count);
 576                 if (ret < 0)
 577                         return ret;
 578                 ret = s5m8767_rtc_set_alarm_reg(info);
 579
 580                 break;
 581
 582         default:
 583                 return -EINVAL;
 584         }
 585
 586         return ret;
 587 }
 588
 589 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 590 {
 591         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 592         u8 data[RTC_MAX_NUM_TIME_REGS];
 593         int ret;
 594
 595         switch (info->device_type) {
 596         case S5M8763X:
 597                 s5m8763_tm_to_data(&alrm->time, data);
 598                 break;
 599
 600         case S5M8767X:
 601         case S2MPS15X:
 602         case S2MPS14X:
 603         case S2MPS13X:
 604                 s5m8767_tm_to_data(&alrm->time, data);
 605                 break;
 606
 607         default:
 608                 return -EINVAL;
 609         }
 610
 611         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, &alrm->time, alrm->time.tm_wday);
 612
 613         ret = s5m_rtc_stop_alarm(info);
 614         if (ret < 0)
 615                 return ret;
 616
 617         ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 618                         info->regs->regs_count);
 619         if (ret < 0)
 620                 return ret;
 621
 622         ret = s5m8767_rtc_set_alarm_reg(info);
 623         if (ret < 0)
 624                 return ret;
 625
 626         if (alrm->enabled)
 627                 ret = s5m_rtc_start_alarm(info);
 628
 629         return ret;
 630 }
 631
 632 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 633                                     unsigned int enabled)
 634 {
 635         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 636
 637         if (enabled)
 638                 return s5m_rtc_start_alarm(info);
 639         else
 640                 return s5m_rtc_stop_alarm(info);
 641 }
 642
 643 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 644 {
 645         struct s5m_rtc_info *info = data;
 646
 647         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 648
 649         return IRQ_HANDLED;
 650 }
 651
 652 static const struct rtc_class_ops s5m_rtc_ops = {
 653         .read_time = s5m_rtc_read_time,
 654         .set_time = s5m_rtc_set_time,
 655         .read_alarm = s5m_rtc_read_alarm,
 656         .set_alarm = s5m_rtc_set_alarm,
 657         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 658 };
 659
 660 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 661 {
 662         u8 data[2];
 663         int ret;
 664
 665         switch (info->device_type) {
 666         case S5M8763X:
 667         case S5M8767X:
 668                 /* UDR update time. Default of 7.32 ms is too long. */
 669                 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
 670                                 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
 671                 if (ret < 0)
 672                         dev_err(info->dev, "%s: fail to change UDR time: %d\n",
 673                                         __func__, ret);
 674
 675                 /* Set RTC control register : Binary mode, 24hour mode */
 676                 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 677                 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 678
 679                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 680                 break;
 681
 682         case S2MPS15X:
 683         case S2MPS14X:
 684         case S2MPS13X:
 685                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 686                 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 687                 if (ret < 0)
 688                         break;
 689
 690                 /*
 691                  * Should set WUDR & (RUDR or AUDR) bits to high after writing
 692                  * RTC_CTRL register like writing Alarm registers. We can't find
 693                  * the description from datasheet but vendor code does that
 694                  * really.
 695                  */
 696                 ret = s5m8767_rtc_set_alarm_reg(info);
 697                 break;
 698
 699         default:
 700                 return -EINVAL;
 701         }
 702
 703         info->rtc_24hr_mode = 1;
 704         if (ret < 0) {
 705                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 706                         __func__, ret);
 707                 return ret;
 708         }
 709
 710         return ret;
 711 }
 712
 713 static int s5m_rtc_probe(struct platform_device *pdev)
 714 {
 715         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 716         struct sec_platform_data *pdata = s5m87xx->pdata;
 717         struct s5m_rtc_info *info;
 718         const struct regmap_config *regmap_cfg;
 719         int ret, alarm_irq;
 720
 721         if (!pdata) {
 722                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 723                 return -ENODEV;
 724         }
 725
 726         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 727         if (!info)
 728                 return -ENOMEM;
 729
 730         switch (platform_get_device_id(pdev)->driver_data) {
 731         case S2MPS15X:
 732                 regmap_cfg = &s2mps14_rtc_regmap_config;
 733                 info->regs = &s2mps15_rtc_regs;
 734                 alarm_irq = S2MPS14_IRQ_RTCA0;
 735                 break;
 736         case S2MPS14X:
 737                 regmap_cfg = &s2mps14_rtc_regmap_config;
 738                 info->regs = &s2mps14_rtc_regs;
 739                 alarm_irq = S2MPS14_IRQ_RTCA0;
 740                 break;
 741         case S2MPS13X:
 742                 regmap_cfg = &s2mps14_rtc_regmap_config;
 743                 info->regs = &s2mps13_rtc_regs;
 744                 alarm_irq = S2MPS14_IRQ_RTCA0;
 745                 break;
 746         case S5M8763X:
 747                 regmap_cfg = &s5m_rtc_regmap_config;
 748                 info->regs = &s5m_rtc_regs;
 749                 alarm_irq = S5M8763_IRQ_ALARM0;
 750                 break;
 751         case S5M8767X:
 752                 regmap_cfg = &s5m_rtc_regmap_config;
 753                 info->regs = &s5m_rtc_regs;
 754                 alarm_irq = S5M8767_IRQ_RTCA1;
 755                 break;
 756         default:
 757                 dev_err(&pdev->dev,
 758                                 "Device type %lu is not supported by RTC driver\n",
 759                                 platform_get_device_id(pdev)->driver_data);
 760                 return -ENODEV;
 761         }
 762
 763         info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
 764         if (!info->i2c) {
 765                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 766                 return -ENODEV;
 767         }
 768
 769         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 770         if (IS_ERR(info->regmap)) {
 771                 ret = PTR_ERR(info->regmap);
 772                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 773                                 ret);
 774                 goto err;
 775         }
 776
 777         info->dev = &pdev->dev;
 778         info->s5m87xx = s5m87xx;
 779         info->device_type = platform_get_device_id(pdev)->driver_data;
 780
 781         if (s5m87xx->irq_data) {
 782                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 783                 if (info->irq <= 0) {
 784                         ret = -EINVAL;
 785                         dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 786                                 alarm_irq);
 787                         goto err;
 788                 }
 789         }
 790
 791         platform_set_drvdata(pdev, info);
 792
 793         ret = s5m8767_rtc_init_reg(info);
 794
 795         device_init_wakeup(&pdev->dev, 1);
 796
 797         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 798                                                  &s5m_rtc_ops, THIS_MODULE);
 799
 800         if (IS_ERR(info->rtc_dev)) {
 801                 ret = PTR_ERR(info->rtc_dev);
 802                 goto err;
 803         }
 804
 805         if (!info->irq) {
 806                 dev_info(&pdev->dev, "Alarm IRQ not available\n");
 807                 return 0;
 808         }
 809
 810         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 811                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 812                                         info);
 813         if (ret < 0) {
 814                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 815                         info->irq, ret);
 816                 goto err;
 817         }
 818
 819         return 0;
 820
 821 err:
 822         i2c_unregister_device(info->i2c);
 823
 824         return ret;
 825 }
 826
 827 static int s5m_rtc_remove(struct platform_device *pdev)
 828 {
 829         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 830
 831         i2c_unregister_device(info->i2c);
 832
 833         return 0;
 834 }
 835
 836 #ifdef CONFIG_PM_SLEEP
 837 static int s5m_rtc_resume(struct device *dev)
 838 {
 839         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 840         int ret = 0;
 841
 842         if (info->irq && device_may_wakeup(dev))
 843                 ret = disable_irq_wake(info->irq);
 844
 845         return ret;
 846 }
 847
 848 static int s5m_rtc_suspend(struct device *dev)
 849 {
 850         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 851         int ret = 0;
 852
 853         if (info->irq && device_may_wakeup(dev))
 854                 ret = enable_irq_wake(info->irq);
 855
 856         return ret;
 857 }
 858 #endif /* CONFIG_PM_SLEEP */
 859
 860 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 861
 862 static const struct platform_device_id s5m_rtc_id[] = {
 863         { "s5m-rtc",            S5M8767X },
 864         { "s2mps13-rtc",        S2MPS13X },
 865         { "s2mps14-rtc",        S2MPS14X },
 866         { "s2mps15-rtc",        S2MPS15X },
 867         { },
 868 };
 869 MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
 870
 871 static struct platform_driver s5m_rtc_driver = {
 872         .driver         = {
 873                 .name   = "s5m-rtc",
 874                 .pm     = &s5m_rtc_pm_ops,
 875         },
 876         .probe          = s5m_rtc_probe,
 877         .remove         = s5m_rtc_remove,
 878         .id_table       = s5m_rtc_id,
 879 };
 880
 881 module_platform_driver(s5m_rtc_driver);
 882
 883 /* Module information */
 884 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 885 MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
 886 MODULE_LICENSE("GPL");
 887 MODULE_ALIAS("platform:s5m-rtc");