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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/module.h>
  21 #include <linux/i2c.h>
  22 #include <linux/bcd.h>
  23 #include <linux/regmap.h>
  24 #include <linux/rtc.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/mfd/samsung/core.h>
  27 #include <linux/mfd/samsung/irq.h>
  28 #include <linux/mfd/samsung/rtc.h>
  29 #include <linux/mfd/samsung/s2mps14.h>
  30
  31 /*
  32  * Maximum number of retries for checking changes in UDR field
  33  * of S5M_RTC_UDR_CON register (to limit possible endless loop).
  34  *
  35  * After writing to RTC registers (setting time or alarm) read the UDR field
  36  * in S5M_RTC_UDR_CON register. UDR is auto-cleared when data have
  37  * been transferred.
  38  */
  39 #define UDR_READ_RETRY_CNT      5
  40
  41 /*
  42  * Registers used by the driver which are different between chipsets.
  43  *
  44  * Operations like read time and write alarm/time require updating
  45  * specific fields in UDR register. These fields usually are auto-cleared
  46  * (with some exceptions).
  47  *
  48  * Table of operations per device:
  49  *
  50  * Device     | Write time | Read time | Write alarm
  51  * =================================================
  52  * S5M8767    | UDR + TIME |           | UDR
  53  * S2MPS11/14 | WUDR       | RUDR      | WUDR + RUDR
  54  * S2MPS13    | WUDR       | RUDR      | WUDR + AUDR
  55  * S2MPS15    | WUDR       | RUDR      | AUDR
  56  */
  57 struct s5m_rtc_reg_config {
  58         /* Number of registers used for setting time/alarm0/alarm1 */
  59         unsigned int regs_count;
  60         /* First register for time, seconds */
  61         unsigned int time;
  62         /* RTC control register */
  63         unsigned int ctrl;
  64         /* First register for alarm 0, seconds */
  65         unsigned int alarm0;
  66         /* First register for alarm 1, seconds */
  67         unsigned int alarm1;
  68         /*
  69          * Register for update flag (UDR). Typically setting UDR field to 1
  70          * will enable update of time or alarm register. Then it will be
  71          * auto-cleared after successful update.
  72          */
  73         unsigned int udr_update;
  74         /* Auto-cleared mask in UDR field for writing time and alarm */
  75         unsigned int autoclear_udr_mask;
  76         /*
  77          * Masks in UDR field for time and alarm operations.
  78          * The read time mask can be 0. Rest should not.
  79          */
  80         unsigned int read_time_udr_mask;
  81         unsigned int write_time_udr_mask;
  82         unsigned int write_alarm_udr_mask;
  83 };
  84
  85 /* Register map for S5M8763 and S5M8767 */
  86 static const struct s5m_rtc_reg_config s5m_rtc_regs = {
  87         .regs_count             = 8,
  88         .time                   = S5M_RTC_SEC,
  89         .ctrl                   = S5M_ALARM1_CONF,
  90         .alarm0                 = S5M_ALARM0_SEC,
  91         .alarm1                 = S5M_ALARM1_SEC,
  92         .udr_update             = S5M_RTC_UDR_CON,
  93         .autoclear_udr_mask     = S5M_RTC_UDR_MASK,
  94         .read_time_udr_mask     = 0, /* Not needed */
  95         .write_time_udr_mask    = S5M_RTC_UDR_MASK | S5M_RTC_TIME_EN_MASK,
  96         .write_alarm_udr_mask   = S5M_RTC_UDR_MASK,
  97 };
  98
  99 /* Register map for S2MPS13 */
 100 static const struct s5m_rtc_reg_config s2mps13_rtc_regs = {
 101         .regs_count             = 7,
 102         .time                   = S2MPS_RTC_SEC,
 103         .ctrl                   = S2MPS_RTC_CTRL,
 104         .alarm0                 = S2MPS_ALARM0_SEC,
 105         .alarm1                 = S2MPS_ALARM1_SEC,
 106         .udr_update             = S2MPS_RTC_UDR_CON,
 107         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 108         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 109         .write_time_udr_mask    = S2MPS_RTC_WUDR_MASK,
 110         .write_alarm_udr_mask   = S2MPS_RTC_WUDR_MASK | S2MPS13_RTC_AUDR_MASK,
 111 };
 112
 113 /* Register map for S2MPS11/14 */
 114 static const struct s5m_rtc_reg_config s2mps14_rtc_regs = {
 115         .regs_count             = 7,
 116         .time                   = S2MPS_RTC_SEC,
 117         .ctrl                   = S2MPS_RTC_CTRL,
 118         .alarm0                 = S2MPS_ALARM0_SEC,
 119         .alarm1                 = S2MPS_ALARM1_SEC,
 120         .udr_update             = S2MPS_RTC_UDR_CON,
 121         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 122         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 123         .write_time_udr_mask    = S2MPS_RTC_WUDR_MASK,
 124         .write_alarm_udr_mask   = S2MPS_RTC_WUDR_MASK | S2MPS_RTC_RUDR_MASK,
 125 };
 126
 127 /*
 128  * Register map for S2MPS15 - in comparison to S2MPS14 the WUDR and AUDR bits
 129  * are swapped.
 130  */
 131 static const struct s5m_rtc_reg_config s2mps15_rtc_regs = {
 132         .regs_count             = 7,
 133         .time                   = S2MPS_RTC_SEC,
 134         .ctrl                   = S2MPS_RTC_CTRL,
 135         .alarm0                 = S2MPS_ALARM0_SEC,
 136         .alarm1                 = S2MPS_ALARM1_SEC,
 137         .udr_update             = S2MPS_RTC_UDR_CON,
 138         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 139         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 140         .write_time_udr_mask    = S2MPS15_RTC_WUDR_MASK,
 141         .write_alarm_udr_mask   = S2MPS15_RTC_AUDR_MASK,
 142 };
 143
 144 struct s5m_rtc_info {
 145         struct device *dev;
 146         struct i2c_client *i2c;
 147         struct sec_pmic_dev *s5m87xx;
 148         struct regmap *regmap;
 149         struct rtc_device *rtc_dev;
 150         int irq;
 151         enum sec_device_type device_type;
 152         int rtc_24hr_mode;
 153         const struct s5m_rtc_reg_config *regs;
 154 };
 155
 156 static const struct regmap_config s5m_rtc_regmap_config = {
 157         .reg_bits = 8,
 158         .val_bits = 8,
 159
 160         .max_register = S5M_RTC_REG_MAX,
 161 };
 162
 163 static const struct regmap_config s2mps14_rtc_regmap_config = {
 164         .reg_bits = 8,
 165         .val_bits = 8,
 166
 167         .max_register = S2MPS_RTC_REG_MAX,
 168 };
 169
 170 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
 171                                int rtc_24hr_mode)
 172 {
 173         tm->tm_sec = data[RTC_SEC] & 0x7f;
 174         tm->tm_min = data[RTC_MIN] & 0x7f;
 175         if (rtc_24hr_mode) {
 176                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
 177         } else {
 178                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
 179                 if (data[RTC_HOUR] & HOUR_PM_MASK)
 180                         tm->tm_hour += 12;
 181         }
 182
 183         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
 184         tm->tm_mday = data[RTC_DATE] & 0x1f;
 185         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
 186         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
 187         tm->tm_yday = 0;
 188         tm->tm_isdst = 0;
 189 }
 190
 191 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
 192 {
 193         data[RTC_SEC] = tm->tm_sec;
 194         data[RTC_MIN] = tm->tm_min;
 195
 196         if (tm->tm_hour >= 12)
 197                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
 198         else
 199                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
 200
 201         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
 202         data[RTC_DATE] = tm->tm_mday;
 203         data[RTC_MONTH] = tm->tm_mon + 1;
 204         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
 205
 206         if (tm->tm_year < 100) {
 207                 pr_err("RTC cannot handle the year %d\n",
 208                        1900 + tm->tm_year);
 209                 return -EINVAL;
 210         } else {
 211                 return 0;
 212         }
 213 }
 214
 215 /*
 216  * Read RTC_UDR_CON register and wait till UDR field is cleared.
 217  * This indicates that time/alarm update ended.
 218  */
 219 static int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 220 {
 221         int ret, retry = UDR_READ_RETRY_CNT;
 222         unsigned int data;
 223
 224         do {
 225                 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 226         } while (--retry && (data & info->regs->autoclear_udr_mask) && !ret);
 227
 228         if (!retry)
 229                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 230
 231         return ret;
 232 }
 233
 234 static int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
 235                 struct rtc_wkalrm *alarm)
 236 {
 237         int ret;
 238         unsigned int val;
 239
 240         switch (info->device_type) {
 241         case S5M8767X:
 242         case S5M8763X:
 243                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 244                 val &= S5M_ALARM0_STATUS;
 245                 break;
 246         case S2MPS15X:
 247         case S2MPS14X:
 248         case S2MPS13X:
 249                 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
 250                                 &val);
 251                 val &= S2MPS_ALARM0_STATUS;
 252                 break;
 253         default:
 254                 return -EINVAL;
 255         }
 256         if (ret < 0)
 257                 return ret;
 258
 259         if (val)
 260                 alarm->pending = 1;
 261         else
 262                 alarm->pending = 0;
 263
 264         return 0;
 265 }
 266
 267 static int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 268 {
 269         int ret;
 270         unsigned int data;
 271
 272         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 273         if (ret < 0) {
 274                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 275                 return ret;
 276         }
 277
 278         data |= info->regs->write_time_udr_mask;
 279
 280         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 281         if (ret < 0) {
 282                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 283                 return ret;
 284         }
 285
 286         ret = s5m8767_wait_for_udr_update(info);
 287
 288         return ret;
 289 }
 290
 291 static int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 292 {
 293         int ret;
 294         unsigned int data;
 295
 296         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 297         if (ret < 0) {
 298                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 299                         __func__, ret);
 300                 return ret;
 301         }
 302
 303         data |= info->regs->write_alarm_udr_mask;
 304         switch (info->device_type) {
 305         case S5M8763X:
 306         case S5M8767X:
 307                 data &= ~S5M_RTC_TIME_EN_MASK;
 308                 break;
 309         case S2MPS15X:
 310         case S2MPS14X:
 311         case S2MPS13X:
 312                 /* No exceptions needed */
 313                 break;
 314         default:
 315                 return -EINVAL;
 316         }
 317
 318         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 319         if (ret < 0) {
 320                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 321                         __func__, ret);
 322                 return ret;
 323         }
 324
 325         ret = s5m8767_wait_for_udr_update(info);
 326
 327         /* On S2MPS13 the AUDR is not auto-cleared */
 328         if (info->device_type == S2MPS13X)
 329                 regmap_update_bits(info->regmap, info->regs->udr_update,
 330                                    S2MPS13_RTC_AUDR_MASK, 0);
 331
 332         return ret;
 333 }
 334
 335 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 336 {
 337         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 338         tm->tm_min = bcd2bin(data[RTC_MIN]);
 339
 340         if (data[RTC_HOUR] & HOUR_12) {
 341                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 342                 if (data[RTC_HOUR] & HOUR_PM)
 343                         tm->tm_hour += 12;
 344         } else {
 345                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 346         }
 347
 348         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 349         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 350         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 351         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 352         tm->tm_year -= 1900;
 353 }
 354
 355 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 356 {
 357         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 358         data[RTC_MIN] = bin2bcd(tm->tm_min);
 359         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 360         data[RTC_WEEKDAY] = tm->tm_wday;
 361         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 362         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 363         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 364         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 365 }
 366
 367 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 368 {
 369         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 370         u8 data[info->regs->regs_count];
 371         int ret;
 372
 373         if (info->regs->read_time_udr_mask) {
 374                 ret = regmap_update_bits(info->regmap,
 375                                 info->regs->udr_update,
 376                                 info->regs->read_time_udr_mask,
 377                                 info->regs->read_time_udr_mask);
 378                 if (ret) {
 379                         dev_err(dev,
 380                                 "Failed to prepare registers for time reading: %d\n",
 381                                 ret);
 382                         return ret;
 383                 }
 384         }
 385         ret = regmap_bulk_read(info->regmap, info->regs->time, data,
 386                         info->regs->regs_count);
 387         if (ret < 0)
 388                 return ret;
 389
 390         switch (info->device_type) {
 391         case S5M8763X:
 392                 s5m8763_data_to_tm(data, tm);
 393                 break;
 394
 395         case S5M8767X:
 396         case S2MPS15X:
 397         case S2MPS14X:
 398         case S2MPS13X:
 399                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 400                 break;
 401
 402         default:
 403                 return -EINVAL;
 404         }
 405
 406         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 407                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 408                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 409
 410         return rtc_valid_tm(tm);
 411 }
 412
 413 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 414 {
 415         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 416         u8 data[info->regs->regs_count];
 417         int ret = 0;
 418
 419         switch (info->device_type) {
 420         case S5M8763X:
 421                 s5m8763_tm_to_data(tm, data);
 422                 break;
 423         case S5M8767X:
 424         case S2MPS15X:
 425         case S2MPS14X:
 426         case S2MPS13X:
 427                 ret = s5m8767_tm_to_data(tm, data);
 428                 break;
 429         default:
 430                 return -EINVAL;
 431         }
 432
 433         if (ret < 0)
 434                 return ret;
 435
 436         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 437                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 438                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 439
 440         ret = regmap_raw_write(info->regmap, info->regs->time, data,
 441                         info->regs->regs_count);
 442         if (ret < 0)
 443                 return ret;
 444
 445         ret = s5m8767_rtc_set_time_reg(info);
 446
 447         return ret;
 448 }
 449
 450 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 451 {
 452         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 453         u8 data[info->regs->regs_count];
 454         unsigned int val;
 455         int ret, i;
 456
 457         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 458                         info->regs->regs_count);
 459         if (ret < 0)
 460                 return ret;
 461
 462         switch (info->device_type) {
 463         case S5M8763X:
 464                 s5m8763_data_to_tm(data, &alrm->time);
 465                 ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
 466                 if (ret < 0)
 467                         return ret;
 468
 469                 alrm->enabled = !!val;
 470                 break;
 471
 472         case S5M8767X:
 473         case S2MPS15X:
 474         case S2MPS14X:
 475         case S2MPS13X:
 476                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 477                 alrm->enabled = 0;
 478                 for (i = 0; i < info->regs->regs_count; i++) {
 479                         if (data[i] & ALARM_ENABLE_MASK) {
 480                                 alrm->enabled = 1;
 481                                 break;
 482                         }
 483                 }
 484                 break;
 485
 486         default:
 487                 return -EINVAL;
 488         }
 489
 490         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 491                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 492                 alrm->time.tm_mday, alrm->time.tm_hour,
 493                 alrm->time.tm_min, alrm->time.tm_sec,
 494                 alrm->time.tm_wday);
 495
 496         ret = s5m_check_peding_alarm_interrupt(info, alrm);
 497
 498         return 0;
 499 }
 500
 501 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 502 {
 503         u8 data[info->regs->regs_count];
 504         int ret, i;
 505         struct rtc_time tm;
 506
 507         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 508                         info->regs->regs_count);
 509         if (ret < 0)
 510                 return ret;
 511
 512         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 513         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 514                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 515                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 516
 517         switch (info->device_type) {
 518         case S5M8763X:
 519                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
 520                 break;
 521
 522         case S5M8767X:
 523         case S2MPS15X:
 524         case S2MPS14X:
 525         case S2MPS13X:
 526                 for (i = 0; i < info->regs->regs_count; i++)
 527                         data[i] &= ~ALARM_ENABLE_MASK;
 528
 529                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 530                                 info->regs->regs_count);
 531                 if (ret < 0)
 532                         return ret;
 533
 534                 ret = s5m8767_rtc_set_alarm_reg(info);
 535
 536                 break;
 537
 538         default:
 539                 return -EINVAL;
 540         }
 541
 542         return ret;
 543 }
 544
 545 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 546 {
 547         int ret;
 548         u8 data[info->regs->regs_count];
 549         u8 alarm0_conf;
 550         struct rtc_time tm;
 551
 552         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 553                         info->regs->regs_count);
 554         if (ret < 0)
 555                 return ret;
 556
 557         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 558         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 559                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 560                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 561
 562         switch (info->device_type) {
 563         case S5M8763X:
 564                 alarm0_conf = 0x77;
 565                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
 566                 break;
 567
 568         case S5M8767X:
 569         case S2MPS15X:
 570         case S2MPS14X:
 571         case S2MPS13X:
 572                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 573                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 574                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 575                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 576                 if (data[RTC_DATE] & 0x1f)
 577                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 578                 if (data[RTC_MONTH] & 0xf)
 579                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 580                 if (data[RTC_YEAR1] & 0x7f)
 581                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 582
 583                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 584                                 info->regs->regs_count);
 585                 if (ret < 0)
 586                         return ret;
 587                 ret = s5m8767_rtc_set_alarm_reg(info);
 588
 589                 break;
 590
 591         default:
 592                 return -EINVAL;
 593         }
 594
 595         return ret;
 596 }
 597
 598 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 599 {
 600         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 601         u8 data[info->regs->regs_count];
 602         int ret;
 603
 604         switch (info->device_type) {
 605         case S5M8763X:
 606                 s5m8763_tm_to_data(&alrm->time, data);
 607                 break;
 608
 609         case S5M8767X:
 610         case S2MPS15X:
 611         case S2MPS14X:
 612         case S2MPS13X:
 613                 s5m8767_tm_to_data(&alrm->time, data);
 614                 break;
 615
 616         default:
 617                 return -EINVAL;
 618         }
 619
 620         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 621                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 622                 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
 623                 alrm->time.tm_sec, alrm->time.tm_wday);
 624
 625         ret = s5m_rtc_stop_alarm(info);
 626         if (ret < 0)
 627                 return ret;
 628
 629         ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 630                         info->regs->regs_count);
 631         if (ret < 0)
 632                 return ret;
 633
 634         ret = s5m8767_rtc_set_alarm_reg(info);
 635         if (ret < 0)
 636                 return ret;
 637
 638         if (alrm->enabled)
 639                 ret = s5m_rtc_start_alarm(info);
 640
 641         return ret;
 642 }
 643
 644 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 645                                     unsigned int enabled)
 646 {
 647         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 648
 649         if (enabled)
 650                 return s5m_rtc_start_alarm(info);
 651         else
 652                 return s5m_rtc_stop_alarm(info);
 653 }
 654
 655 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 656 {
 657         struct s5m_rtc_info *info = data;
 658
 659         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 660
 661         return IRQ_HANDLED;
 662 }
 663
 664 static const struct rtc_class_ops s5m_rtc_ops = {
 665         .read_time = s5m_rtc_read_time,
 666         .set_time = s5m_rtc_set_time,
 667         .read_alarm = s5m_rtc_read_alarm,
 668         .set_alarm = s5m_rtc_set_alarm,
 669         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 670 };
 671
 672 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 673 {
 674         u8 data[2];
 675         int ret;
 676
 677         switch (info->device_type) {
 678         case S5M8763X:
 679         case S5M8767X:
 680                 /* UDR update time. Default of 7.32 ms is too long. */
 681                 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
 682                                 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
 683                 if (ret < 0)
 684                         dev_err(info->dev, "%s: fail to change UDR time: %d\n",
 685                                         __func__, ret);
 686
 687                 /* Set RTC control register : Binary mode, 24hour mode */
 688                 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 689                 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 690
 691                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 692                 break;
 693
 694         case S2MPS15X:
 695         case S2MPS14X:
 696         case S2MPS13X:
 697                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 698                 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 699                 if (ret < 0)
 700                         break;
 701
 702                 /*
 703                  * Should set WUDR & (RUDR or AUDR) bits to high after writing
 704                  * RTC_CTRL register like writing Alarm registers. We can't find
 705                  * the description from datasheet but vendor code does that
 706                  * really.
 707                  */
 708                 ret = s5m8767_rtc_set_alarm_reg(info);
 709                 break;
 710
 711         default:
 712                 return -EINVAL;
 713         }
 714
 715         info->rtc_24hr_mode = 1;
 716         if (ret < 0) {
 717                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 718                         __func__, ret);
 719                 return ret;
 720         }
 721
 722         return ret;
 723 }
 724
 725 static int s5m_rtc_probe(struct platform_device *pdev)
 726 {
 727         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 728         struct sec_platform_data *pdata = s5m87xx->pdata;
 729         struct s5m_rtc_info *info;
 730         const struct regmap_config *regmap_cfg;
 731         int ret, alarm_irq;
 732
 733         if (!pdata) {
 734                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 735                 return -ENODEV;
 736         }
 737
 738         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 739         if (!info)
 740                 return -ENOMEM;
 741
 742         switch (platform_get_device_id(pdev)->driver_data) {
 743         case S2MPS15X:
 744                 regmap_cfg = &s2mps14_rtc_regmap_config;
 745                 info->regs = &s2mps15_rtc_regs;
 746                 alarm_irq = S2MPS14_IRQ_RTCA0;
 747                 break;
 748         case S2MPS14X:
 749                 regmap_cfg = &s2mps14_rtc_regmap_config;
 750                 info->regs = &s2mps14_rtc_regs;
 751                 alarm_irq = S2MPS14_IRQ_RTCA0;
 752                 break;
 753         case S2MPS13X:
 754                 regmap_cfg = &s2mps14_rtc_regmap_config;
 755                 info->regs = &s2mps13_rtc_regs;
 756                 alarm_irq = S2MPS14_IRQ_RTCA0;
 757                 break;
 758         case S5M8763X:
 759                 regmap_cfg = &s5m_rtc_regmap_config;
 760                 info->regs = &s5m_rtc_regs;
 761                 alarm_irq = S5M8763_IRQ_ALARM0;
 762                 break;
 763         case S5M8767X:
 764                 regmap_cfg = &s5m_rtc_regmap_config;
 765                 info->regs = &s5m_rtc_regs;
 766                 alarm_irq = S5M8767_IRQ_RTCA1;
 767                 break;
 768         default:
 769                 dev_err(&pdev->dev,
 770                                 "Device type %lu is not supported by RTC driver\n",
 771                                 platform_get_device_id(pdev)->driver_data);
 772                 return -ENODEV;
 773         }
 774
 775         info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
 776         if (!info->i2c) {
 777                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 778                 return -ENODEV;
 779         }
 780
 781         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 782         if (IS_ERR(info->regmap)) {
 783                 ret = PTR_ERR(info->regmap);
 784                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 785                                 ret);
 786                 goto err;
 787         }
 788
 789         info->dev = &pdev->dev;
 790         info->s5m87xx = s5m87xx;
 791         info->device_type = platform_get_device_id(pdev)->driver_data;
 792
 793         if (s5m87xx->irq_data) {
 794                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 795                 if (info->irq <= 0) {
 796                         ret = -EINVAL;
 797                         dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 798                                 alarm_irq);
 799                         goto err;
 800                 }
 801         }
 802
 803         platform_set_drvdata(pdev, info);
 804
 805         ret = s5m8767_rtc_init_reg(info);
 806
 807         device_init_wakeup(&pdev->dev, 1);
 808
 809         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 810                                                  &s5m_rtc_ops, THIS_MODULE);
 811
 812         if (IS_ERR(info->rtc_dev)) {
 813                 ret = PTR_ERR(info->rtc_dev);
 814                 goto err;
 815         }
 816
 817         if (!info->irq) {
 818                 dev_info(&pdev->dev, "Alarm IRQ not available\n");
 819                 return 0;
 820         }
 821
 822         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 823                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 824                                         info);
 825         if (ret < 0) {
 826                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 827                         info->irq, ret);
 828                 goto err;
 829         }
 830
 831         return 0;
 832
 833 err:
 834         i2c_unregister_device(info->i2c);
 835
 836         return ret;
 837 }
 838
 839 static int s5m_rtc_remove(struct platform_device *pdev)
 840 {
 841         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 842
 843         i2c_unregister_device(info->i2c);
 844
 845         return 0;
 846 }
 847
 848 #ifdef CONFIG_PM_SLEEP
 849 static int s5m_rtc_resume(struct device *dev)
 850 {
 851         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 852         int ret = 0;
 853
 854         if (info->irq && device_may_wakeup(dev))
 855                 ret = disable_irq_wake(info->irq);
 856
 857         return ret;
 858 }
 859
 860 static int s5m_rtc_suspend(struct device *dev)
 861 {
 862         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 863         int ret = 0;
 864
 865         if (info->irq && device_may_wakeup(dev))
 866                 ret = enable_irq_wake(info->irq);
 867
 868         return ret;
 869 }
 870 #endif /* CONFIG_PM_SLEEP */
 871
 872 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 873
 874 static const struct platform_device_id s5m_rtc_id[] = {
 875         { "s5m-rtc",            S5M8767X },
 876         { "s2mps13-rtc",        S2MPS13X },
 877         { "s2mps14-rtc",        S2MPS14X },
 878         { "s2mps15-rtc",        S2MPS15X },
 879         { },
 880 };
 881 MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
 882
 883 static struct platform_driver s5m_rtc_driver = {
 884         .driver         = {
 885                 .name   = "s5m-rtc",
 886                 .pm     = &s5m_rtc_pm_ops,
 887         },
 888         .probe          = s5m_rtc_probe,
 889         .remove         = s5m_rtc_remove,
 890         .id_table       = s5m_rtc_id,
 891 };
 892
 893 module_platform_driver(s5m_rtc_driver);
 894
 895 /* Module information */
 896 MODULE_AUTHOR("Sangbeom Kim <[email protected]>");
 897 MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
 898 MODULE_LICENSE("GPL");
 899 MODULE_ALIAS("platform:s5m-rtc");