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 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;
 208
 209         return 0;
 210 }
 211
 212 /*
 213  * Read RTC_UDR_CON register and wait till UDR field is cleared.
 214  * This indicates that time/alarm update ended.
 215  */
 216 static int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 217 {
 218         int ret, retry = UDR_READ_RETRY_CNT;
 219         unsigned int data;
 220
 221         do {
 222                 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 223         } while (--retry && (data & info->regs->autoclear_udr_mask) && !ret);
 224
 225         if (!retry)
 226                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 227
 228         return ret;
 229 }
 230
 231 static int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
 232                 struct rtc_wkalrm *alarm)
 233 {
 234         int ret;
 235         unsigned int val;
 236
 237         switch (info->device_type) {
 238         case S5M8767X:
 239                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 240                 val &= S5M_ALARM0_STATUS;
 241                 break;
 242         case S2MPS15X:
 243         case S2MPS14X:
 244         case S2MPS13X:
 245                 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
 246                                 &val);
 247                 val &= S2MPS_ALARM0_STATUS;
 248                 break;
 249         default:
 250                 return -EINVAL;
 251         }
 252         if (ret < 0)
 253                 return ret;
 254
 255         if (val)
 256                 alarm->pending = 1;
 257         else
 258                 alarm->pending = 0;
 259
 260         return 0;
 261 }
 262
 263 static int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 264 {
 265         int ret;
 266         unsigned int data;
 267
 268         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 269         if (ret < 0) {
 270                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 271                 return ret;
 272         }
 273
 274         data |= info->regs->write_time_udr_mask;
 275
 276         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 277         if (ret < 0) {
 278                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 279                 return ret;
 280         }
 281
 282         ret = s5m8767_wait_for_udr_update(info);
 283
 284         return ret;
 285 }
 286
 287 static int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 288 {
 289         int ret;
 290         unsigned int data;
 291
 292         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 293         if (ret < 0) {
 294                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 295                         __func__, ret);
 296                 return ret;
 297         }
 298
 299         data |= info->regs->write_alarm_udr_mask;
 300         switch (info->device_type) {
 301         case S5M8767X:
 302                 data &= ~S5M_RTC_TIME_EN_MASK;
 303                 break;
 304         case S2MPS15X:
 305         case S2MPS14X:
 306         case S2MPS13X:
 307                 /* No exceptions needed */
 308                 break;
 309         default:
 310                 return -EINVAL;
 311         }
 312
 313         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 314         if (ret < 0) {
 315                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 316                         __func__, ret);
 317                 return ret;
 318         }
 319
 320         ret = s5m8767_wait_for_udr_update(info);
 321
 322         /* On S2MPS13 the AUDR is not auto-cleared */
 323         if (info->device_type == S2MPS13X)
 324                 regmap_update_bits(info->regmap, info->regs->udr_update,
 325                                    S2MPS13_RTC_AUDR_MASK, 0);
 326
 327         return ret;
 328 }
 329
 330 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 331 {
 332         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 333         u8 data[RTC_MAX_NUM_TIME_REGS];
 334         int ret;
 335
 336         if (info->regs->read_time_udr_mask) {
 337                 ret = regmap_update_bits(info->regmap,
 338                                 info->regs->udr_update,
 339                                 info->regs->read_time_udr_mask,
 340                                 info->regs->read_time_udr_mask);
 341                 if (ret) {
 342                         dev_err(dev,
 343                                 "Failed to prepare registers for time reading: %d\n",
 344                                 ret);
 345                         return ret;
 346                 }
 347         }
 348         ret = regmap_bulk_read(info->regmap, info->regs->time, data,
 349                         info->regs->regs_count);
 350         if (ret < 0)
 351                 return ret;
 352
 353         switch (info->device_type) {
 354         case S5M8767X:
 355         case S2MPS15X:
 356         case S2MPS14X:
 357         case S2MPS13X:
 358                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 359                 break;
 360
 361         default:
 362                 return -EINVAL;
 363         }
 364
 365         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, tm, tm->tm_wday);
 366
 367         return 0;
 368 }
 369
 370 static int s5m_rtc_set_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 = 0;
 375
 376         switch (info->device_type) {
 377         case S5M8767X:
 378         case S2MPS15X:
 379         case S2MPS14X:
 380         case S2MPS13X:
 381                 ret = s5m8767_tm_to_data(tm, data);
 382                 break;
 383         default:
 384                 return -EINVAL;
 385         }
 386
 387         if (ret < 0)
 388                 return ret;
 389
 390         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, tm, tm->tm_wday);
 391
 392         ret = regmap_raw_write(info->regmap, info->regs->time, data,
 393                         info->regs->regs_count);
 394         if (ret < 0)
 395                 return ret;
 396
 397         ret = s5m8767_rtc_set_time_reg(info);
 398
 399         return ret;
 400 }
 401
 402 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 403 {
 404         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 405         u8 data[RTC_MAX_NUM_TIME_REGS];
 406         int ret, i;
 407
 408         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 409                         info->regs->regs_count);
 410         if (ret < 0)
 411                 return ret;
 412
 413         switch (info->device_type) {
 414         case S5M8767X:
 415         case S2MPS15X:
 416         case S2MPS14X:
 417         case S2MPS13X:
 418                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 419                 alrm->enabled = 0;
 420                 for (i = 0; i < info->regs->regs_count; i++) {
 421                         if (data[i] & ALARM_ENABLE_MASK) {
 422                                 alrm->enabled = 1;
 423                                 break;
 424                         }
 425                 }
 426                 break;
 427
 428         default:
 429                 return -EINVAL;
 430         }
 431
 432         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, &alrm->time, alrm->time.tm_wday);
 433
 434         return s5m_check_peding_alarm_interrupt(info, alrm);
 435 }
 436
 437 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 438 {
 439         u8 data[RTC_MAX_NUM_TIME_REGS];
 440         int ret, i;
 441         struct rtc_time tm;
 442
 443         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 444                         info->regs->regs_count);
 445         if (ret < 0)
 446                 return ret;
 447
 448         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 449         dev_dbg(info->dev, "%s: %ptR(%d)\n", __func__, &tm, tm.tm_wday);
 450
 451         switch (info->device_type) {
 452         case S5M8767X:
 453         case S2MPS15X:
 454         case S2MPS14X:
 455         case S2MPS13X:
 456                 for (i = 0; i < info->regs->regs_count; i++)
 457                         data[i] &= ~ALARM_ENABLE_MASK;
 458
 459                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 460                                 info->regs->regs_count);
 461                 if (ret < 0)
 462                         return ret;
 463
 464                 ret = s5m8767_rtc_set_alarm_reg(info);
 465
 466                 break;
 467
 468         default:
 469                 return -EINVAL;
 470         }
 471
 472         return ret;
 473 }
 474
 475 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 476 {
 477         int ret;
 478         u8 data[RTC_MAX_NUM_TIME_REGS];
 479         struct rtc_time tm;
 480
 481         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 482                         info->regs->regs_count);
 483         if (ret < 0)
 484                 return ret;
 485
 486         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 487         dev_dbg(info->dev, "%s: %ptR(%d)\n", __func__, &tm, tm.tm_wday);
 488
 489         switch (info->device_type) {
 490         case S5M8767X:
 491         case S2MPS15X:
 492         case S2MPS14X:
 493         case S2MPS13X:
 494                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 495                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 496                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 497                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 498                 if (data[RTC_DATE] & 0x1f)
 499                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 500                 if (data[RTC_MONTH] & 0xf)
 501                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 502                 if (data[RTC_YEAR1] & 0x7f)
 503                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 504
 505                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 506                                 info->regs->regs_count);
 507                 if (ret < 0)
 508                         return ret;
 509                 ret = s5m8767_rtc_set_alarm_reg(info);
 510
 511                 break;
 512
 513         default:
 514                 return -EINVAL;
 515         }
 516
 517         return ret;
 518 }
 519
 520 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 521 {
 522         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 523         u8 data[RTC_MAX_NUM_TIME_REGS];
 524         int ret;
 525
 526         switch (info->device_type) {
 527         case S5M8767X:
 528         case S2MPS15X:
 529         case S2MPS14X:
 530         case S2MPS13X:
 531                 s5m8767_tm_to_data(&alrm->time, data);
 532                 break;
 533
 534         default:
 535                 return -EINVAL;
 536         }
 537
 538         dev_dbg(dev, "%s: %ptR(%d)\n", __func__, &alrm->time, alrm->time.tm_wday);
 539
 540         ret = s5m_rtc_stop_alarm(info);
 541         if (ret < 0)
 542                 return ret;
 543
 544         ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 545                         info->regs->regs_count);
 546         if (ret < 0)
 547                 return ret;
 548
 549         ret = s5m8767_rtc_set_alarm_reg(info);
 550         if (ret < 0)
 551                 return ret;
 552
 553         if (alrm->enabled)
 554                 ret = s5m_rtc_start_alarm(info);
 555
 556         return ret;
 557 }
 558
 559 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 560                                     unsigned int enabled)
 561 {
 562         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 563
 564         if (enabled)
 565                 return s5m_rtc_start_alarm(info);
 566         else
 567                 return s5m_rtc_stop_alarm(info);
 568 }
 569
 570 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 571 {
 572         struct s5m_rtc_info *info = data;
 573
 574         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 575
 576         return IRQ_HANDLED;
 577 }
 578
 579 static const struct rtc_class_ops s5m_rtc_ops = {
 580         .read_time = s5m_rtc_read_time,
 581         .set_time = s5m_rtc_set_time,
 582         .read_alarm = s5m_rtc_read_alarm,
 583         .set_alarm = s5m_rtc_set_alarm,
 584         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 585 };
 586
 587 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 588 {
 589         u8 data[2];
 590         int ret;
 591
 592         switch (info->device_type) {
 593         case S5M8767X:
 594                 /* UDR update time. Default of 7.32 ms is too long. */
 595                 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
 596                                 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
 597                 if (ret < 0)
 598                         dev_err(info->dev, "%s: fail to change UDR time: %d\n",
 599                                         __func__, ret);
 600
 601                 /* Set RTC control register : Binary mode, 24hour mode */
 602                 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 603                 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 604
 605                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 606                 break;
 607
 608         case S2MPS15X:
 609         case S2MPS14X:
 610         case S2MPS13X:
 611                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 612                 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 613                 if (ret < 0)
 614                         break;
 615
 616                 /*
 617                  * Should set WUDR & (RUDR or AUDR) bits to high after writing
 618                  * RTC_CTRL register like writing Alarm registers. We can't find
 619                  * the description from datasheet but vendor code does that
 620                  * really.
 621                  */
 622                 ret = s5m8767_rtc_set_alarm_reg(info);
 623                 break;
 624
 625         default:
 626                 return -EINVAL;
 627         }
 628
 629         info->rtc_24hr_mode = 1;
 630         if (ret < 0) {
 631                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 632                         __func__, ret);
 633                 return ret;
 634         }
 635
 636         return ret;
 637 }
 638
 639 static int s5m_rtc_probe(struct platform_device *pdev)
 640 {
 641         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 642         struct s5m_rtc_info *info;
 643         const struct regmap_config *regmap_cfg;
 644         int ret, alarm_irq;
 645
 646         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 647         if (!info)
 648                 return -ENOMEM;
 649
 650         switch (platform_get_device_id(pdev)->driver_data) {
 651         case S2MPS15X:
 652                 regmap_cfg = &s2mps14_rtc_regmap_config;
 653                 info->regs = &s2mps15_rtc_regs;
 654                 alarm_irq = S2MPS14_IRQ_RTCA0;
 655                 break;
 656         case S2MPS14X:
 657                 regmap_cfg = &s2mps14_rtc_regmap_config;
 658                 info->regs = &s2mps14_rtc_regs;
 659                 alarm_irq = S2MPS14_IRQ_RTCA0;
 660                 break;
 661         case S2MPS13X:
 662                 regmap_cfg = &s2mps14_rtc_regmap_config;
 663                 info->regs = &s2mps13_rtc_regs;
 664                 alarm_irq = S2MPS14_IRQ_RTCA0;
 665                 break;
 666         case S5M8767X:
 667                 regmap_cfg = &s5m_rtc_regmap_config;
 668                 info->regs = &s5m_rtc_regs;
 669                 alarm_irq = S5M8767_IRQ_RTCA1;
 670                 break;
 671         default:
 672                 dev_err(&pdev->dev,
 673                                 "Device type %lu is not supported by RTC driver\n",
 674                                 platform_get_device_id(pdev)->driver_data);
 675                 return -ENODEV;
 676         }
 677
 678         info->i2c = devm_i2c_new_dummy_device(&pdev->dev, s5m87xx->i2c->adapter,
 679                                               RTC_I2C_ADDR);
 680         if (IS_ERR(info->i2c)) {
 681                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 682                 return PTR_ERR(info->i2c);
 683         }
 684
 685         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 686         if (IS_ERR(info->regmap)) {
 687                 ret = PTR_ERR(info->regmap);
 688                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 689                                 ret);
 690                 return ret;
 691         }
 692
 693         info->dev = &pdev->dev;
 694         info->s5m87xx = s5m87xx;
 695         info->device_type = platform_get_device_id(pdev)->driver_data;
 696
 697         if (s5m87xx->irq_data) {
 698                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 699                 if (info->irq <= 0) {
 700                         dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 701                                 alarm_irq);
 702                         return -EINVAL;
 703                 }
 704         }
 705
 706         platform_set_drvdata(pdev, info);
 707
 708         ret = s5m8767_rtc_init_reg(info);
 709         if (ret)
 710                 return ret;
 711
 712         info->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
 713         if (IS_ERR(info->rtc_dev))
 714                 return PTR_ERR(info->rtc_dev);
 715
 716         info->rtc_dev->ops = &s5m_rtc_ops;
 717
 718         info->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
 719         info->rtc_dev->range_max = RTC_TIMESTAMP_END_2099;
 720
 721         if (!info->irq) {
 722                 clear_bit(RTC_FEATURE_ALARM, info->rtc_dev->features);
 723         } else {
 724                 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 725                                                 s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 726                                                 info);
 727                 if (ret < 0) {
 728                         dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 729                                 info->irq, ret);
 730                         return ret;
 731                 }
 732                 device_init_wakeup(&pdev->dev, 1);
 733         }
 734
 735         return devm_rtc_register_device(info->rtc_dev);
 736 }
 737
 738 #ifdef CONFIG_PM_SLEEP
 739 static int s5m_rtc_resume(struct device *dev)
 740 {
 741         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 742         int ret = 0;
 743
 744         if (info->irq && device_may_wakeup(dev))
 745                 ret = disable_irq_wake(info->irq);
 746
 747         return ret;
 748 }
 749
 750 static int s5m_rtc_suspend(struct device *dev)
 751 {
 752         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 753         int ret = 0;
 754
 755         if (info->irq && device_may_wakeup(dev))
 756                 ret = enable_irq_wake(info->irq);
 757
 758         return ret;
 759 }
 760 #endif /* CONFIG_PM_SLEEP */
 761
 762 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 763
 764 static const struct platform_device_id s5m_rtc_id[] = {
 765         { "s5m-rtc",            S5M8767X },
 766         { "s2mps13-rtc",        S2MPS13X },
 767         { "s2mps14-rtc",        S2MPS14X },
 768         { "s2mps15-rtc",        S2MPS15X },
 769         { },
 770 };
 771 MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
 772
 773 static struct platform_driver s5m_rtc_driver = {
 774         .driver         = {
 775                 .name   = "s5m-rtc",
 776                 .pm     = &s5m_rtc_pm_ops,
 777         },
 778         .probe          = s5m_rtc_probe,
 779         .id_table       = s5m_rtc_id,
 780 };
 781
 782 module_platform_driver(s5m_rtc_driver);
 783
 784 /* Module information */
 785 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 786 MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
 787 MODULE_LICENSE("GPL");