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 enum {
  42         RTC_SEC = 0,
  43         RTC_MIN,
  44         RTC_HOUR,
  45         RTC_WEEKDAY,
  46         RTC_DATE,
  47         RTC_MONTH,
  48         RTC_YEAR1,
  49         RTC_YEAR2,
  50         /* Make sure this is always the last enum name. */
  51         RTC_MAX_NUM_TIME_REGS
  52 };
  53
  54 /*
  55  * Registers used by the driver which are different between chipsets.
  56  *
  57  * Operations like read time and write alarm/time require updating
  58  * specific fields in UDR register. These fields usually are auto-cleared
  59  * (with some exceptions).
  60  *
  61  * Table of operations per device:
  62  *
  63  * Device     | Write time | Read time | Write alarm
  64  * =================================================
  65  * S5M8767    | UDR + TIME |           | UDR
  66  * S2MPS11/14 | WUDR       | RUDR      | WUDR + RUDR
  67  * S2MPS13    | WUDR       | RUDR      | WUDR + AUDR
  68  * S2MPS15    | WUDR       | RUDR      | AUDR
  69  */
  70 struct s5m_rtc_reg_config {
  71         /* Number of registers used for setting time/alarm0/alarm1 */
  72         unsigned int regs_count;
  73         /* First register for time, seconds */
  74         unsigned int time;
  75         /* RTC control register */
  76         unsigned int ctrl;
  77         /* First register for alarm 0, seconds */
  78         unsigned int alarm0;
  79         /* First register for alarm 1, seconds */
  80         unsigned int alarm1;
  81         /*
  82          * Register for update flag (UDR). Typically setting UDR field to 1
  83          * will enable update of time or alarm register. Then it will be
  84          * auto-cleared after successful update.
  85          */
  86         unsigned int udr_update;
  87         /* Auto-cleared mask in UDR field for writing time and alarm */
  88         unsigned int autoclear_udr_mask;
  89         /*
  90          * Masks in UDR field for time and alarm operations.
  91          * The read time mask can be 0. Rest should not.
  92          */
  93         unsigned int read_time_udr_mask;
  94         unsigned int write_time_udr_mask;
  95         unsigned int write_alarm_udr_mask;
  96 };
  97
  98 /* Register map for S5M8763 and S5M8767 */
  99 static const struct s5m_rtc_reg_config s5m_rtc_regs = {
 100         .regs_count             = 8,
 101         .time                   = S5M_RTC_SEC,
 102         .ctrl                   = S5M_ALARM1_CONF,
 103         .alarm0                 = S5M_ALARM0_SEC,
 104         .alarm1                 = S5M_ALARM1_SEC,
 105         .udr_update             = S5M_RTC_UDR_CON,
 106         .autoclear_udr_mask     = S5M_RTC_UDR_MASK,
 107         .read_time_udr_mask     = 0, /* Not needed */
 108         .write_time_udr_mask    = S5M_RTC_UDR_MASK | S5M_RTC_TIME_EN_MASK,
 109         .write_alarm_udr_mask   = S5M_RTC_UDR_MASK,
 110 };
 111
 112 /* Register map for S2MPS13 */
 113 static const struct s5m_rtc_reg_config s2mps13_rtc_regs = {
 114         .regs_count             = 7,
 115         .time                   = S2MPS_RTC_SEC,
 116         .ctrl                   = S2MPS_RTC_CTRL,
 117         .alarm0                 = S2MPS_ALARM0_SEC,
 118         .alarm1                 = S2MPS_ALARM1_SEC,
 119         .udr_update             = S2MPS_RTC_UDR_CON,
 120         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 121         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 122         .write_time_udr_mask    = S2MPS_RTC_WUDR_MASK,
 123         .write_alarm_udr_mask   = S2MPS_RTC_WUDR_MASK | S2MPS13_RTC_AUDR_MASK,
 124 };
 125
 126 /* Register map for S2MPS11/14 */
 127 static const struct s5m_rtc_reg_config s2mps14_rtc_regs = {
 128         .regs_count             = 7,
 129         .time                   = S2MPS_RTC_SEC,
 130         .ctrl                   = S2MPS_RTC_CTRL,
 131         .alarm0                 = S2MPS_ALARM0_SEC,
 132         .alarm1                 = S2MPS_ALARM1_SEC,
 133         .udr_update             = S2MPS_RTC_UDR_CON,
 134         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 135         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 136         .write_time_udr_mask    = S2MPS_RTC_WUDR_MASK,
 137         .write_alarm_udr_mask   = S2MPS_RTC_WUDR_MASK | S2MPS_RTC_RUDR_MASK,
 138 };
 139
 140 /*
 141  * Register map for S2MPS15 - in comparison to S2MPS14 the WUDR and AUDR bits
 142  * are swapped.
 143  */
 144 static const struct s5m_rtc_reg_config s2mps15_rtc_regs = {
 145         .regs_count             = 7,
 146         .time                   = S2MPS_RTC_SEC,
 147         .ctrl                   = S2MPS_RTC_CTRL,
 148         .alarm0                 = S2MPS_ALARM0_SEC,
 149         .alarm1                 = S2MPS_ALARM1_SEC,
 150         .udr_update             = S2MPS_RTC_UDR_CON,
 151         .autoclear_udr_mask     = S2MPS_RTC_WUDR_MASK,
 152         .read_time_udr_mask     = S2MPS_RTC_RUDR_MASK,
 153         .write_time_udr_mask    = S2MPS15_RTC_WUDR_MASK,
 154         .write_alarm_udr_mask   = S2MPS15_RTC_AUDR_MASK,
 155 };
 156
 157 struct s5m_rtc_info {
 158         struct device *dev;
 159         struct i2c_client *i2c;
 160         struct sec_pmic_dev *s5m87xx;
 161         struct regmap *regmap;
 162         struct rtc_device *rtc_dev;
 163         int irq;
 164         enum sec_device_type device_type;
 165         int rtc_24hr_mode;
 166         const struct s5m_rtc_reg_config *regs;
 167 };
 168
 169 static const struct regmap_config s5m_rtc_regmap_config = {
 170         .reg_bits = 8,
 171         .val_bits = 8,
 172
 173         .max_register = S5M_RTC_REG_MAX,
 174 };
 175
 176 static const struct regmap_config s2mps14_rtc_regmap_config = {
 177         .reg_bits = 8,
 178         .val_bits = 8,
 179
 180         .max_register = S2MPS_RTC_REG_MAX,
 181 };
 182
 183 static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
 184                                int rtc_24hr_mode)
 185 {
 186         tm->tm_sec = data[RTC_SEC] & 0x7f;
 187         tm->tm_min = data[RTC_MIN] & 0x7f;
 188         if (rtc_24hr_mode) {
 189                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
 190         } else {
 191                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
 192                 if (data[RTC_HOUR] & HOUR_PM_MASK)
 193                         tm->tm_hour += 12;
 194         }
 195
 196         tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
 197         tm->tm_mday = data[RTC_DATE] & 0x1f;
 198         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
 199         tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
 200         tm->tm_yday = 0;
 201         tm->tm_isdst = 0;
 202 }
 203
 204 static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
 205 {
 206         data[RTC_SEC] = tm->tm_sec;
 207         data[RTC_MIN] = tm->tm_min;
 208
 209         if (tm->tm_hour >= 12)
 210                 data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
 211         else
 212                 data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
 213
 214         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
 215         data[RTC_DATE] = tm->tm_mday;
 216         data[RTC_MONTH] = tm->tm_mon + 1;
 217         data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
 218
 219         if (tm->tm_year < 100) {
 220                 pr_err("RTC cannot handle the year %d\n",
 221                        1900 + tm->tm_year);
 222                 return -EINVAL;
 223         } else {
 224                 return 0;
 225         }
 226 }
 227
 228 /*
 229  * Read RTC_UDR_CON register and wait till UDR field is cleared.
 230  * This indicates that time/alarm update ended.
 231  */
 232 static int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
 233 {
 234         int ret, retry = UDR_READ_RETRY_CNT;
 235         unsigned int data;
 236
 237         do {
 238                 ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 239         } while (--retry && (data & info->regs->autoclear_udr_mask) && !ret);
 240
 241         if (!retry)
 242                 dev_err(info->dev, "waiting for UDR update, reached max number of retries\n");
 243
 244         return ret;
 245 }
 246
 247 static int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
 248                 struct rtc_wkalrm *alarm)
 249 {
 250         int ret;
 251         unsigned int val;
 252
 253         switch (info->device_type) {
 254         case S5M8767X:
 255         case S5M8763X:
 256                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
 257                 val &= S5M_ALARM0_STATUS;
 258                 break;
 259         case S2MPS15X:
 260         case S2MPS14X:
 261         case S2MPS13X:
 262                 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
 263                                 &val);
 264                 val &= S2MPS_ALARM0_STATUS;
 265                 break;
 266         default:
 267                 return -EINVAL;
 268         }
 269         if (ret < 0)
 270                 return ret;
 271
 272         if (val)
 273                 alarm->pending = 1;
 274         else
 275                 alarm->pending = 0;
 276
 277         return 0;
 278 }
 279
 280 static int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
 281 {
 282         int ret;
 283         unsigned int data;
 284
 285         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 286         if (ret < 0) {
 287                 dev_err(info->dev, "failed to read update reg(%d)\n", ret);
 288                 return ret;
 289         }
 290
 291         data |= info->regs->write_time_udr_mask;
 292
 293         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 294         if (ret < 0) {
 295                 dev_err(info->dev, "failed to write update reg(%d)\n", ret);
 296                 return ret;
 297         }
 298
 299         ret = s5m8767_wait_for_udr_update(info);
 300
 301         return ret;
 302 }
 303
 304 static int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
 305 {
 306         int ret;
 307         unsigned int data;
 308
 309         ret = regmap_read(info->regmap, info->regs->udr_update, &data);
 310         if (ret < 0) {
 311                 dev_err(info->dev, "%s: fail to read update reg(%d)\n",
 312                         __func__, ret);
 313                 return ret;
 314         }
 315
 316         data |= info->regs->write_alarm_udr_mask;
 317         switch (info->device_type) {
 318         case S5M8763X:
 319         case S5M8767X:
 320                 data &= ~S5M_RTC_TIME_EN_MASK;
 321                 break;
 322         case S2MPS15X:
 323         case S2MPS14X:
 324         case S2MPS13X:
 325                 /* No exceptions needed */
 326                 break;
 327         default:
 328                 return -EINVAL;
 329         }
 330
 331         ret = regmap_write(info->regmap, info->regs->udr_update, data);
 332         if (ret < 0) {
 333                 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
 334                         __func__, ret);
 335                 return ret;
 336         }
 337
 338         ret = s5m8767_wait_for_udr_update(info);
 339
 340         /* On S2MPS13 the AUDR is not auto-cleared */
 341         if (info->device_type == S2MPS13X)
 342                 regmap_update_bits(info->regmap, info->regs->udr_update,
 343                                    S2MPS13_RTC_AUDR_MASK, 0);
 344
 345         return ret;
 346 }
 347
 348 static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
 349 {
 350         tm->tm_sec = bcd2bin(data[RTC_SEC]);
 351         tm->tm_min = bcd2bin(data[RTC_MIN]);
 352
 353         if (data[RTC_HOUR] & HOUR_12) {
 354                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
 355                 if (data[RTC_HOUR] & HOUR_PM)
 356                         tm->tm_hour += 12;
 357         } else {
 358                 tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
 359         }
 360
 361         tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
 362         tm->tm_mday = bcd2bin(data[RTC_DATE]);
 363         tm->tm_mon = bcd2bin(data[RTC_MONTH]);
 364         tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
 365         tm->tm_year -= 1900;
 366 }
 367
 368 static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
 369 {
 370         data[RTC_SEC] = bin2bcd(tm->tm_sec);
 371         data[RTC_MIN] = bin2bcd(tm->tm_min);
 372         data[RTC_HOUR] = bin2bcd(tm->tm_hour);
 373         data[RTC_WEEKDAY] = tm->tm_wday;
 374         data[RTC_DATE] = bin2bcd(tm->tm_mday);
 375         data[RTC_MONTH] = bin2bcd(tm->tm_mon);
 376         data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
 377         data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
 378 }
 379
 380 static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
 381 {
 382         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 383         u8 data[RTC_MAX_NUM_TIME_REGS];
 384         int ret;
 385
 386         if (info->regs->read_time_udr_mask) {
 387                 ret = regmap_update_bits(info->regmap,
 388                                 info->regs->udr_update,
 389                                 info->regs->read_time_udr_mask,
 390                                 info->regs->read_time_udr_mask);
 391                 if (ret) {
 392                         dev_err(dev,
 393                                 "Failed to prepare registers for time reading: %d\n",
 394                                 ret);
 395                         return ret;
 396                 }
 397         }
 398         ret = regmap_bulk_read(info->regmap, info->regs->time, data,
 399                         info->regs->regs_count);
 400         if (ret < 0)
 401                 return ret;
 402
 403         switch (info->device_type) {
 404         case S5M8763X:
 405                 s5m8763_data_to_tm(data, tm);
 406                 break;
 407
 408         case S5M8767X:
 409         case S2MPS15X:
 410         case S2MPS14X:
 411         case S2MPS13X:
 412                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 413                 break;
 414
 415         default:
 416                 return -EINVAL;
 417         }
 418
 419         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 420                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 421                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 422
 423         return 0;
 424 }
 425
 426 static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
 427 {
 428         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 429         u8 data[RTC_MAX_NUM_TIME_REGS];
 430         int ret = 0;
 431
 432         switch (info->device_type) {
 433         case S5M8763X:
 434                 s5m8763_tm_to_data(tm, data);
 435                 break;
 436         case S5M8767X:
 437         case S2MPS15X:
 438         case S2MPS14X:
 439         case S2MPS13X:
 440                 ret = s5m8767_tm_to_data(tm, data);
 441                 break;
 442         default:
 443                 return -EINVAL;
 444         }
 445
 446         if (ret < 0)
 447                 return ret;
 448
 449         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 450                 1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
 451                 tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
 452
 453         ret = regmap_raw_write(info->regmap, info->regs->time, data,
 454                         info->regs->regs_count);
 455         if (ret < 0)
 456                 return ret;
 457
 458         ret = s5m8767_rtc_set_time_reg(info);
 459
 460         return ret;
 461 }
 462
 463 static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 464 {
 465         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 466         u8 data[RTC_MAX_NUM_TIME_REGS];
 467         unsigned int val;
 468         int ret, i;
 469
 470         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 471                         info->regs->regs_count);
 472         if (ret < 0)
 473                 return ret;
 474
 475         switch (info->device_type) {
 476         case S5M8763X:
 477                 s5m8763_data_to_tm(data, &alrm->time);
 478                 ret = regmap_read(info->regmap, S5M_ALARM0_CONF, &val);
 479                 if (ret < 0)
 480                         return ret;
 481
 482                 alrm->enabled = !!val;
 483                 break;
 484
 485         case S5M8767X:
 486         case S2MPS15X:
 487         case S2MPS14X:
 488         case S2MPS13X:
 489                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 490                 alrm->enabled = 0;
 491                 for (i = 0; i < info->regs->regs_count; i++) {
 492                         if (data[i] & ALARM_ENABLE_MASK) {
 493                                 alrm->enabled = 1;
 494                                 break;
 495                         }
 496                 }
 497                 break;
 498
 499         default:
 500                 return -EINVAL;
 501         }
 502
 503         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 504                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 505                 alrm->time.tm_mday, alrm->time.tm_hour,
 506                 alrm->time.tm_min, alrm->time.tm_sec,
 507                 alrm->time.tm_wday);
 508
 509         ret = s5m_check_peding_alarm_interrupt(info, alrm);
 510
 511         return 0;
 512 }
 513
 514 static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
 515 {
 516         u8 data[RTC_MAX_NUM_TIME_REGS];
 517         int ret, i;
 518         struct rtc_time tm;
 519
 520         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 521                         info->regs->regs_count);
 522         if (ret < 0)
 523                 return ret;
 524
 525         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 526         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 527                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 528                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 529
 530         switch (info->device_type) {
 531         case S5M8763X:
 532                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, 0);
 533                 break;
 534
 535         case S5M8767X:
 536         case S2MPS15X:
 537         case S2MPS14X:
 538         case S2MPS13X:
 539                 for (i = 0; i < info->regs->regs_count; i++)
 540                         data[i] &= ~ALARM_ENABLE_MASK;
 541
 542                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 543                                 info->regs->regs_count);
 544                 if (ret < 0)
 545                         return ret;
 546
 547                 ret = s5m8767_rtc_set_alarm_reg(info);
 548
 549                 break;
 550
 551         default:
 552                 return -EINVAL;
 553         }
 554
 555         return ret;
 556 }
 557
 558 static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
 559 {
 560         int ret;
 561         u8 data[RTC_MAX_NUM_TIME_REGS];
 562         u8 alarm0_conf;
 563         struct rtc_time tm;
 564
 565         ret = regmap_bulk_read(info->regmap, info->regs->alarm0, data,
 566                         info->regs->regs_count);
 567         if (ret < 0)
 568                 return ret;
 569
 570         s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
 571         dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 572                 1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
 573                 tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
 574
 575         switch (info->device_type) {
 576         case S5M8763X:
 577                 alarm0_conf = 0x77;
 578                 ret = regmap_write(info->regmap, S5M_ALARM0_CONF, alarm0_conf);
 579                 break;
 580
 581         case S5M8767X:
 582         case S2MPS15X:
 583         case S2MPS14X:
 584         case S2MPS13X:
 585                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
 586                 data[RTC_MIN] |= ALARM_ENABLE_MASK;
 587                 data[RTC_HOUR] |= ALARM_ENABLE_MASK;
 588                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 589                 if (data[RTC_DATE] & 0x1f)
 590                         data[RTC_DATE] |= ALARM_ENABLE_MASK;
 591                 if (data[RTC_MONTH] & 0xf)
 592                         data[RTC_MONTH] |= ALARM_ENABLE_MASK;
 593                 if (data[RTC_YEAR1] & 0x7f)
 594                         data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
 595
 596                 ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 597                                 info->regs->regs_count);
 598                 if (ret < 0)
 599                         return ret;
 600                 ret = s5m8767_rtc_set_alarm_reg(info);
 601
 602                 break;
 603
 604         default:
 605                 return -EINVAL;
 606         }
 607
 608         return ret;
 609 }
 610
 611 static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 612 {
 613         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 614         u8 data[RTC_MAX_NUM_TIME_REGS];
 615         int ret;
 616
 617         switch (info->device_type) {
 618         case S5M8763X:
 619                 s5m8763_tm_to_data(&alrm->time, data);
 620                 break;
 621
 622         case S5M8767X:
 623         case S2MPS15X:
 624         case S2MPS14X:
 625         case S2MPS13X:
 626                 s5m8767_tm_to_data(&alrm->time, data);
 627                 break;
 628
 629         default:
 630                 return -EINVAL;
 631         }
 632
 633         dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)\n", __func__,
 634                 1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
 635                 alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
 636                 alrm->time.tm_sec, alrm->time.tm_wday);
 637
 638         ret = s5m_rtc_stop_alarm(info);
 639         if (ret < 0)
 640                 return ret;
 641
 642         ret = regmap_raw_write(info->regmap, info->regs->alarm0, data,
 643                         info->regs->regs_count);
 644         if (ret < 0)
 645                 return ret;
 646
 647         ret = s5m8767_rtc_set_alarm_reg(info);
 648         if (ret < 0)
 649                 return ret;
 650
 651         if (alrm->enabled)
 652                 ret = s5m_rtc_start_alarm(info);
 653
 654         return ret;
 655 }
 656
 657 static int s5m_rtc_alarm_irq_enable(struct device *dev,
 658                                     unsigned int enabled)
 659 {
 660         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 661
 662         if (enabled)
 663                 return s5m_rtc_start_alarm(info);
 664         else
 665                 return s5m_rtc_stop_alarm(info);
 666 }
 667
 668 static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
 669 {
 670         struct s5m_rtc_info *info = data;
 671
 672         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 673
 674         return IRQ_HANDLED;
 675 }
 676
 677 static const struct rtc_class_ops s5m_rtc_ops = {
 678         .read_time = s5m_rtc_read_time,
 679         .set_time = s5m_rtc_set_time,
 680         .read_alarm = s5m_rtc_read_alarm,
 681         .set_alarm = s5m_rtc_set_alarm,
 682         .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
 683 };
 684
 685 static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
 686 {
 687         u8 data[2];
 688         int ret;
 689
 690         switch (info->device_type) {
 691         case S5M8763X:
 692         case S5M8767X:
 693                 /* UDR update time. Default of 7.32 ms is too long. */
 694                 ret = regmap_update_bits(info->regmap, S5M_RTC_UDR_CON,
 695                                 S5M_RTC_UDR_T_MASK, S5M_RTC_UDR_T_450_US);
 696                 if (ret < 0)
 697                         dev_err(info->dev, "%s: fail to change UDR time: %d\n",
 698                                         __func__, ret);
 699
 700                 /* Set RTC control register : Binary mode, 24hour mode */
 701                 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 702                 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 703
 704                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
 705                 break;
 706
 707         case S2MPS15X:
 708         case S2MPS14X:
 709         case S2MPS13X:
 710                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 711                 ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 712                 if (ret < 0)
 713                         break;
 714
 715                 /*
 716                  * Should set WUDR & (RUDR or AUDR) bits to high after writing
 717                  * RTC_CTRL register like writing Alarm registers. We can't find
 718                  * the description from datasheet but vendor code does that
 719                  * really.
 720                  */
 721                 ret = s5m8767_rtc_set_alarm_reg(info);
 722                 break;
 723
 724         default:
 725                 return -EINVAL;
 726         }
 727
 728         info->rtc_24hr_mode = 1;
 729         if (ret < 0) {
 730                 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
 731                         __func__, ret);
 732                 return ret;
 733         }
 734
 735         return ret;
 736 }
 737
 738 static int s5m_rtc_probe(struct platform_device *pdev)
 739 {
 740         struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
 741         struct sec_platform_data *pdata = s5m87xx->pdata;
 742         struct s5m_rtc_info *info;
 743         const struct regmap_config *regmap_cfg;
 744         int ret, alarm_irq;
 745
 746         if (!pdata) {
 747                 dev_err(pdev->dev.parent, "Platform data not supplied\n");
 748                 return -ENODEV;
 749         }
 750
 751         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 752         if (!info)
 753                 return -ENOMEM;
 754
 755         switch (platform_get_device_id(pdev)->driver_data) {
 756         case S2MPS15X:
 757                 regmap_cfg = &s2mps14_rtc_regmap_config;
 758                 info->regs = &s2mps15_rtc_regs;
 759                 alarm_irq = S2MPS14_IRQ_RTCA0;
 760                 break;
 761         case S2MPS14X:
 762                 regmap_cfg = &s2mps14_rtc_regmap_config;
 763                 info->regs = &s2mps14_rtc_regs;
 764                 alarm_irq = S2MPS14_IRQ_RTCA0;
 765                 break;
 766         case S2MPS13X:
 767                 regmap_cfg = &s2mps14_rtc_regmap_config;
 768                 info->regs = &s2mps13_rtc_regs;
 769                 alarm_irq = S2MPS14_IRQ_RTCA0;
 770                 break;
 771         case S5M8763X:
 772                 regmap_cfg = &s5m_rtc_regmap_config;
 773                 info->regs = &s5m_rtc_regs;
 774                 alarm_irq = S5M8763_IRQ_ALARM0;
 775                 break;
 776         case S5M8767X:
 777                 regmap_cfg = &s5m_rtc_regmap_config;
 778                 info->regs = &s5m_rtc_regs;
 779                 alarm_irq = S5M8767_IRQ_RTCA1;
 780                 break;
 781         default:
 782                 dev_err(&pdev->dev,
 783                                 "Device type %lu is not supported by RTC driver\n",
 784                                 platform_get_device_id(pdev)->driver_data);
 785                 return -ENODEV;
 786         }
 787
 788         info->i2c = i2c_new_dummy(s5m87xx->i2c->adapter, RTC_I2C_ADDR);
 789         if (!info->i2c) {
 790                 dev_err(&pdev->dev, "Failed to allocate I2C for RTC\n");
 791                 return -ENODEV;
 792         }
 793
 794         info->regmap = devm_regmap_init_i2c(info->i2c, regmap_cfg);
 795         if (IS_ERR(info->regmap)) {
 796                 ret = PTR_ERR(info->regmap);
 797                 dev_err(&pdev->dev, "Failed to allocate RTC register map: %d\n",
 798                                 ret);
 799                 goto err;
 800         }
 801
 802         info->dev = &pdev->dev;
 803         info->s5m87xx = s5m87xx;
 804         info->device_type = platform_get_device_id(pdev)->driver_data;
 805
 806         if (s5m87xx->irq_data) {
 807                 info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
 808                 if (info->irq <= 0) {
 809                         ret = -EINVAL;
 810                         dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
 811                                 alarm_irq);
 812                         goto err;
 813                 }
 814         }
 815
 816         platform_set_drvdata(pdev, info);
 817
 818         ret = s5m8767_rtc_init_reg(info);
 819
 820         device_init_wakeup(&pdev->dev, 1);
 821
 822         info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
 823                                                  &s5m_rtc_ops, THIS_MODULE);
 824
 825         if (IS_ERR(info->rtc_dev)) {
 826                 ret = PTR_ERR(info->rtc_dev);
 827                 goto err;
 828         }
 829
 830         if (!info->irq) {
 831                 dev_info(&pdev->dev, "Alarm IRQ not available\n");
 832                 return 0;
 833         }
 834
 835         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 836                                         s5m_rtc_alarm_irq, 0, "rtc-alarm0",
 837                                         info);
 838         if (ret < 0) {
 839                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 840                         info->irq, ret);
 841                 goto err;
 842         }
 843
 844         return 0;
 845
 846 err:
 847         i2c_unregister_device(info->i2c);
 848
 849         return ret;
 850 }
 851
 852 static int s5m_rtc_remove(struct platform_device *pdev)
 853 {
 854         struct s5m_rtc_info *info = platform_get_drvdata(pdev);
 855
 856         i2c_unregister_device(info->i2c);
 857
 858         return 0;
 859 }
 860
 861 #ifdef CONFIG_PM_SLEEP
 862 static int s5m_rtc_resume(struct device *dev)
 863 {
 864         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 865         int ret = 0;
 866
 867         if (info->irq && device_may_wakeup(dev))
 868                 ret = disable_irq_wake(info->irq);
 869
 870         return ret;
 871 }
 872
 873 static int s5m_rtc_suspend(struct device *dev)
 874 {
 875         struct s5m_rtc_info *info = dev_get_drvdata(dev);
 876         int ret = 0;
 877
 878         if (info->irq && device_may_wakeup(dev))
 879                 ret = enable_irq_wake(info->irq);
 880
 881         return ret;
 882 }
 883 #endif /* CONFIG_PM_SLEEP */
 884
 885 static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
 886
 887 static const struct platform_device_id s5m_rtc_id[] = {
 888         { "s5m-rtc",            S5M8767X },
 889         { "s2mps13-rtc",        S2MPS13X },
 890         { "s2mps14-rtc",        S2MPS14X },
 891         { "s2mps15-rtc",        S2MPS15X },
 892         { },
 893 };
 894 MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
 895
 896 static struct platform_driver s5m_rtc_driver = {
 897         .driver         = {
 898                 .name   = "s5m-rtc",
 899                 .pm     = &s5m_rtc_pm_ops,
 900         },
 901         .probe          = s5m_rtc_probe,
 902         .remove         = s5m_rtc_remove,
 903         .id_table       = s5m_rtc_id,
 904 };
 905
 906 module_platform_driver(s5m_rtc_driver);
 907
 908 /* Module information */
 909 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 910 MODULE_DESCRIPTION("Samsung S5M/S2MPS14 RTC driver");
 911 MODULE_LICENSE("GPL");
 912 MODULE_ALIAS("platform:s5m-rtc");