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         return s5m_check_peding_alarm_interrupt(info, alrm);
 492 }
 493
 494 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 495 {
 496         u8 data[RTC_MAX_NUM_TIME_REGS];
 497         int ret, i;
 498         struct rtc_time tm;
 499
 500         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 501                         info->regs->regs_count);
 502         if (ret < 0)
 503                 return ret;
 504
 505         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 506         dev_dbg(info->dev, "%s: %ptR(%d)\n", __func__, &tm, tm.tm_wday);
 507
 508         switch (info->device_type) {
 509         case S5M8763X:
 510                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
 511                 break;
 512
 513         case S5M8767X:
 514         case S2MPS15X:
 515         case S2MPS14X:
 516         case S2MPS13X:
 517                 for (i = 0; i < info->regs->regs_count; i++)
 518                         data[i] &= ~ALARM_ENABLE_MASK;
 519
 520                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 521                                 info->regs->regs_count);
 522                 if (ret < 0)
 523                         return ret;
 524
 525                 ret = s5m8767_rtc_set_alarm_reg(info);
 526
 527                 break;
 528
 529         default:
 530                 return -EINVAL;
 531         }
 532
 533         return ret;
 534 }
 535
 536 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 537 {
 538         int ret;
 539         u8 data[RTC_MAX_NUM_TIME_REGS];
 540         u8 alarm0_conf;
 541         struct rtc_time tm;
 542
 543         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 544                         info->regs->regs_count);
 545         if (ret < 0)
 546                 return ret;
 547
 548         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 549         dev_dbg(info->dev, "%s: %ptR(%d)\n", __func__, &tm, tm.tm_wday);
 550
 551         switch (info->device_type) {
 552         case S5M8763X:
 553                 alarm0_conf = 0x77;
 554                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
 555                 break;
 556
 557         case S5M8767X:
 558         case S2MPS15X:
 559         case S2MPS14X:
 560         case S2MPS13X:
 561                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 562                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 563                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 564                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 565                 if (data[RTC_DATE] & 0x1f)
 566                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 567                 if (data[RTC_MONTH] & 0xf)
 568                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 569                 if (data[RTC_YEAR1] & 0x7f)
 570                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 571
 572                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 573                                 info->regs->regs_count);
 574                 if (ret < 0)
 575                         return ret;
 576                 ret = s5m8767_rtc_set_alarm_reg(info);
 577
 578                 break;
 579
 580         default:
 581                 return -EINVAL;
 582         }
 583
 584         return ret;
 585 }
 586
 587 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 588 {
 589         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 590         u8 data[RTC_MAX_NUM_TIME_REGS];
 591         int ret;
 592
 593         switch (info->device_type) {
 594         case S5M8763X:
 595                 s5m8763_tm_to_data(&alrm->time, data);
 596                 break;
 597
 598         case S5M8767X:
 599         case S2MPS15X:
 600         case S2MPS14X:
 601         case S2MPS13X:
 602                 s5m8767_tm_to_data(&alrm->time, data);
 603                 break;
 604
 605         default:
 606                 return -EINVAL;
 607         }
 608
 609         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, &alrm->time, alrm->time.tm_wday);
 610
 611         ret = s5m_rtc_stop_alarm(info);
 612         if (ret < 0)
 613                 return ret;
 614
 615         ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 616                         info->regs->regs_count);
 617         if (ret < 0)
 618                 return ret;
 619
 620         ret = s5m8767_rtc_set_alarm_reg(info);
 621         if (ret < 0)
 622                 return ret;
 623
 624         if (alrm->enabled)
 625                 ret = s5m_rtc_start_alarm(info);
 626
 627         return ret;
 628 }
 629
 630 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 631                                     unsigned int enabled)
 632 {
 633         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 634
 635         if (enabled)
 636                 return s5m_rtc_start_alarm(info);
 637         else
 638                 return s5m_rtc_stop_alarm(info);
 639 }
 640
 641 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 642 {
 643         struct s5m_rtc_info *info = data;
 644
 645         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 646
 647         return IRQ_HANDLED;
 648 }
 649
 650 static const struct rtc_class_ops s5m_rtc_ops = {
 651         .read_time = s5m_rtc_read_time,
 652         .set_time = s5m_rtc_set_time,
 653         .read_alarm = s5m_rtc_read_alarm,
 654         .set_alarm = s5m_rtc_set_alarm,
 655         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 656 };
 657
 658 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 659 {
 660         u8 data[2];
 661         int ret;
 662
 663         switch (info->device_type) {
 664         case S5M8763X:
 665         case S5M8767X:
 666                 /* UDR update time. Default of 7.32 ms is too long. */
 667                 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
 668                                 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
 669                 if (ret < 0)
 670                         dev_err(info->dev, "%s: fail to change UDR time: %d\n",
 671                                         __func__, ret);
 672
 673                 /* Set RTC control register : Binary mode, 24hour mode */
 674                 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 675                 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 676
 677                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 678                 break;
 679
 680         case S2MPS15X:
 681         case S2MPS14X:
 682         case S2MPS13X:
 683                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 684                 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 685                 if (ret < 0)
 686                         break;
 687
 688                 /*
 689                  * Should set WUDR & (RUDR or AUDR) bits to high after writing
 690                  * RTC_CTRL register like writing Alarm registers. We can't find
 691                  * the description from datasheet but vendor code does that
 692                  * really.
 693                  */
 694                 ret = s5m8767_rtc_set_alarm_reg(info);
 695                 break;
 696
 697         default:
 698                 return -EINVAL;
 699         }
 700
 701         info->rtc_24hr_mode = 1;
 702         if (ret < 0) {
 703                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 704                         __func__, ret);
 705                 return ret;
 706         }
 707
 708         return ret;
 709 }
 710
 711 static int s5m_rtc_probe(struct platform_device *pdev)
 712 {
 713         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 714         struct s5m_rtc_info *info;
 715         const struct regmap_config *regmap_cfg;
 716         int ret, alarm_irq;
 717
 718         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 719         if (!info)
 720                 return -ENOMEM;
 721
 722         switch (platform_get_device_id(pdev)->driver_data) {
 723         case S2MPS15X:
 724                 regmap_cfg = &s2mps14_rtc_regmap_config;
 725                 info->regs = &s2mps15_rtc_regs;
 726                 alarm_irq = S2MPS14_IRQ_RTCA0;
 727                 break;
 728         case S2MPS14X:
 729                 regmap_cfg = &s2mps14_rtc_regmap_config;
 730                 info->regs = &s2mps14_rtc_regs;
 731                 alarm_irq = S2MPS14_IRQ_RTCA0;
 732                 break;
 733         case S2MPS13X:
 734                 regmap_cfg = &s2mps14_rtc_regmap_config;
 735                 info->regs = &s2mps13_rtc_regs;
 736                 alarm_irq = S2MPS14_IRQ_RTCA0;
 737                 break;
 738         case S5M8763X:
 739                 regmap_cfg = &s5m_rtc_regmap_config;
 740                 info->regs = &s5m_rtc_regs;
 741                 alarm_irq = S5M8763_IRQ_ALARM0;
 742                 break;
 743         case S5M8767X:
 744                 regmap_cfg = &s5m_rtc_regmap_config;
 745                 info->regs = &s5m_rtc_regs;
 746                 alarm_irq = S5M8767_IRQ_RTCA1;
 747                 break;
 748         default:
 749                 dev_err(&pdev->dev,
 750                                 "Device type %lu is not supported by RTC driver\n",
 751                                 platform_get_device_id(pdev)->driver_data);
 752                 return -ENODEV;
 753         }
 754
 755         info->i2c = devm_i2c_new_dummy_device(&pdev->dev, s5m87xx->i2c->adapter,
 756                                               RTC_I2C_ADDR);
 757         if (IS_ERR(info->i2c)) {
 758                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 759                 return PTR_ERR(info->i2c);
 760         }
 761
 762         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 763         if (IS_ERR(info->regmap)) {
 764                 ret = PTR_ERR(info->regmap);
 765                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 766                                 ret);
 767                 return ret;
 768         }
 769
 770         info->dev = &pdev->dev;
 771         info->s5m87xx = s5m87xx;
 772         info->device_type = platform_get_device_id(pdev)->driver_data;
 773
 774         if (s5m87xx->irq_data) {
 775                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 776                 if (info->irq <= 0) {
 777                         dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 778                                 alarm_irq);
 779                         return -EINVAL;
 780                 }
 781         }
 782
 783         platform_set_drvdata(pdev, info);
 784
 785         ret = s5m8767_rtc_init_reg(info);
 786         if (ret)
 787                 return ret;
 788
 789         device_init_wakeup(&pdev->dev, 1);
 790
 791         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 792                                                  &s5m_rtc_ops, THIS_MODULE);
 793
 794         if (IS_ERR(info->rtc_dev))
 795                 return PTR_ERR(info->rtc_dev);
 796
 797         if (!info->irq) {
 798                 dev_info(&pdev->dev, "Alarm IRQ not available\n");
 799                 return 0;
 800         }
 801
 802         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 803                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 804                                         info);
 805         if (ret < 0) {
 806                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 807                         info->irq, ret);
 808                 return ret;
 809         }
 810
 811         return 0;
 812 }
 813
 814 #ifdef CONFIG_PM_SLEEP
 815 static int s5m_rtc_resume(struct device *dev)
 816 {
 817         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 818         int ret = 0;
 819
 820         if (info->irq && device_may_wakeup(dev))
 821                 ret = disable_irq_wake(info->irq);
 822
 823         return ret;
 824 }
 825
 826 static int s5m_rtc_suspend(struct device *dev)
 827 {
 828         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 829         int ret = 0;
 830
 831         if (info->irq && device_may_wakeup(dev))
 832                 ret = enable_irq_wake(info->irq);
 833
 834         return ret;
 835 }
 836 #endif /* CONFIG_PM_SLEEP */
 837
 838 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 839
 840 static const struct platform_device_id s5m_rtc_id[] = {
 841         { "s5m-rtc",            S5M8767X },
 842         { "s2mps13-rtc",        S2MPS13X },
 843         { "s2mps14-rtc",        S2MPS14X },
 844         { "s2mps15-rtc",        S2MPS15X },
 845         { },
 846 };
 847 MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
 848
 849 static struct platform_driver s5m_rtc_driver = {
 850         .driver         = {
 851                 .name   = "s5m-rtc",
 852                 .pm     = &s5m_rtc_pm_ops,
 853         },
 854         .probe          = s5m_rtc_probe,
 855         .id_table       = s5m_rtc_id,
 856 };
 857
 858 module_platform_driver(s5m_rtc_driver);
 859
 860 /* Module information */
 861 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 862 MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
 863 MODULE_LICENSE("GPL");
 864 MODULE_ALIAS("platform:s5m-rtc");