drivers/rtc/rtc-max77686.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // RTC driver for Maxim MAX77686 and MAX77802
   4 //
   5 // Copyright (C) 2012 Samsung Electronics Co.Ltd
   6 //
   7 //  based on rtc-max8997.c
   8
   9 #include <linux/i2c.h>
  10 #include <linux/slab.h>
  11 #include <linux/rtc.h>
  12 #include <linux/delay.h>
  13 #include <linux/mutex.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mfd/max77686-private.h>
  17 #include <linux/irqdomain.h>
  18 #include <linux/regmap.h>
  19
  20 #define MAX77686_I2C_ADDR_RTC           (0x0C >> 1)
  21 #define MAX77620_I2C_ADDR_RTC           0x68
  22 #define MAX77686_INVALID_I2C_ADDR       (-1)
  23
  24 /* Define non existing register */
  25 #define MAX77686_INVALID_REG            (-1)
  26
  27 /* RTC Control Register */
  28 #define BCD_EN_SHIFT                    0
  29 #define BCD_EN_MASK                     BIT(BCD_EN_SHIFT)
  30 #define MODEL24_SHIFT                   1
  31 #define MODEL24_MASK                    BIT(MODEL24_SHIFT)
  32 /* RTC Update Register1 */
  33 #define RTC_UDR_SHIFT                   0
  34 #define RTC_UDR_MASK                    BIT(RTC_UDR_SHIFT)
  35 #define RTC_RBUDR_SHIFT                 4
  36 #define RTC_RBUDR_MASK                  BIT(RTC_RBUDR_SHIFT)
  37 /* RTC Hour register */
  38 #define HOUR_PM_SHIFT                   6
  39 #define HOUR_PM_MASK                    BIT(HOUR_PM_SHIFT)
  40 /* RTC Alarm Enable */
  41 #define ALARM_ENABLE_SHIFT              7
  42 #define ALARM_ENABLE_MASK               BIT(ALARM_ENABLE_SHIFT)
  43
  44 #define REG_RTC_NONE                    0xdeadbeef
  45
  46 /*
  47  * MAX77802 has separate register (RTCAE1) for alarm enable instead
  48  * using 1 bit from registers RTC{SEC,MIN,HOUR,DAY,MONTH,YEAR,DATE}
  49  * as in done in MAX77686.
  50  */
  51 #define MAX77802_ALARM_ENABLE_VALUE     0x77
  52
  53 enum {
  54         RTC_SEC = 0,
  55         RTC_MIN,
  56         RTC_HOUR,
  57         RTC_WEEKDAY,
  58         RTC_MONTH,
  59         RTC_YEAR,
  60         RTC_DATE,
  61         RTC_NR_TIME
  62 };
  63
  64 struct max77686_rtc_driver_data {
  65         /* Minimum usecs needed for a RTC update */
  66         unsigned long           delay;
  67         /* Mask used to read RTC registers value */
  68         u8                      mask;
  69         /* Registers offset to I2C addresses map */
  70         const unsigned int      *map;
  71         /* Has a separate alarm enable register? */
  72         bool                    alarm_enable_reg;
  73         /* I2C address for RTC block */
  74         int                     rtc_i2c_addr;
  75         /* RTC interrupt via platform resource */
  76         bool                    rtc_irq_from_platform;
  77         /* Pending alarm status register */
  78         int                     alarm_pending_status_reg;
  79         /* RTC IRQ CHIP for regmap */
  80         const struct regmap_irq_chip *rtc_irq_chip;
  81 };
  82
  83 struct max77686_rtc_info {
  84         struct device           *dev;
  85         struct i2c_client       *rtc;
  86         struct rtc_device       *rtc_dev;
  87         struct mutex            lock;
  88
  89         struct regmap           *regmap;
  90         struct regmap           *rtc_regmap;
  91
  92         const struct max77686_rtc_driver_data *drv_data;
  93         struct regmap_irq_chip_data *rtc_irq_data;
  94
  95         int rtc_irq;
  96         int virq;
  97         int rtc_24hr_mode;
  98 };
  99
 100 enum MAX77686_RTC_OP {
 101         MAX77686_RTC_WRITE,
 102         MAX77686_RTC_READ,
 103 };
 104
 105 /* These are not registers but just offsets that are mapped to addresses */
 106 enum max77686_rtc_reg_offset {
 107         REG_RTC_CONTROLM = 0,
 108         REG_RTC_CONTROL,
 109         REG_RTC_UPDATE0,
 110         REG_WTSR_SMPL_CNTL,
 111         REG_RTC_SEC,
 112         REG_RTC_MIN,
 113         REG_RTC_HOUR,
 114         REG_RTC_WEEKDAY,
 115         REG_RTC_MONTH,
 116         REG_RTC_YEAR,
 117         REG_RTC_DATE,
 118         REG_ALARM1_SEC,
 119         REG_ALARM1_MIN,
 120         REG_ALARM1_HOUR,
 121         REG_ALARM1_WEEKDAY,
 122         REG_ALARM1_MONTH,
 123         REG_ALARM1_YEAR,
 124         REG_ALARM1_DATE,
 125         REG_ALARM2_SEC,
 126         REG_ALARM2_MIN,
 127         REG_ALARM2_HOUR,
 128         REG_ALARM2_WEEKDAY,
 129         REG_ALARM2_MONTH,
 130         REG_ALARM2_YEAR,
 131         REG_ALARM2_DATE,
 132         REG_RTC_AE1,
 133         REG_RTC_END,
 134 };
 135
 136 /* Maps RTC registers offset to the MAX77686 register addresses */
 137 static const unsigned int max77686_map[REG_RTC_END] = {
 138         [REG_RTC_CONTROLM]   = MAX77686_RTC_CONTROLM,
 139         [REG_RTC_CONTROL]    = MAX77686_RTC_CONTROL,
 140         [REG_RTC_UPDATE0]    = MAX77686_RTC_UPDATE0,
 141         [REG_WTSR_SMPL_CNTL] = MAX77686_WTSR_SMPL_CNTL,
 142         [REG_RTC_SEC]        = MAX77686_RTC_SEC,
 143         [REG_RTC_MIN]        = MAX77686_RTC_MIN,
 144         [REG_RTC_HOUR]       = MAX77686_RTC_HOUR,
 145         [REG_RTC_WEEKDAY]    = MAX77686_RTC_WEEKDAY,
 146         [REG_RTC_MONTH]      = MAX77686_RTC_MONTH,
 147         [REG_RTC_YEAR]       = MAX77686_RTC_YEAR,
 148         [REG_RTC_DATE]       = MAX77686_RTC_DATE,
 149         [REG_ALARM1_SEC]     = MAX77686_ALARM1_SEC,
 150         [REG_ALARM1_MIN]     = MAX77686_ALARM1_MIN,
 151         [REG_ALARM1_HOUR]    = MAX77686_ALARM1_HOUR,
 152         [REG_ALARM1_WEEKDAY] = MAX77686_ALARM1_WEEKDAY,
 153         [REG_ALARM1_MONTH]   = MAX77686_ALARM1_MONTH,
 154         [REG_ALARM1_YEAR]    = MAX77686_ALARM1_YEAR,
 155         [REG_ALARM1_DATE]    = MAX77686_ALARM1_DATE,
 156         [REG_ALARM2_SEC]     = MAX77686_ALARM2_SEC,
 157         [REG_ALARM2_MIN]     = MAX77686_ALARM2_MIN,
 158         [REG_ALARM2_HOUR]    = MAX77686_ALARM2_HOUR,
 159         [REG_ALARM2_WEEKDAY] = MAX77686_ALARM2_WEEKDAY,
 160         [REG_ALARM2_MONTH]   = MAX77686_ALARM2_MONTH,
 161         [REG_ALARM2_YEAR]    = MAX77686_ALARM2_YEAR,
 162         [REG_ALARM2_DATE]    = MAX77686_ALARM2_DATE,
 163         [REG_RTC_AE1]        = REG_RTC_NONE,
 164 };
 165
 166 static const struct regmap_irq max77686_rtc_irqs[] = {
 167         /* RTC interrupts */
 168         REGMAP_IRQ_REG(0, 0, MAX77686_RTCINT_RTC60S_MSK),
 169         REGMAP_IRQ_REG(1, 0, MAX77686_RTCINT_RTCA1_MSK),
 170         REGMAP_IRQ_REG(2, 0, MAX77686_RTCINT_RTCA2_MSK),
 171         REGMAP_IRQ_REG(3, 0, MAX77686_RTCINT_SMPL_MSK),
 172         REGMAP_IRQ_REG(4, 0, MAX77686_RTCINT_RTC1S_MSK),
 173         REGMAP_IRQ_REG(5, 0, MAX77686_RTCINT_WTSR_MSK),
 174 };
 175
 176 static const struct regmap_irq_chip max77686_rtc_irq_chip = {
 177         .name           = "max77686-rtc",
 178         .status_base    = MAX77686_RTC_INT,
 179         .mask_base      = MAX77686_RTC_INTM,
 180         .num_regs       = 1,
 181         .irqs           = max77686_rtc_irqs,
 182         .num_irqs       = ARRAY_SIZE(max77686_rtc_irqs),
 183 };
 184
 185 static const struct max77686_rtc_driver_data max77686_drv_data = {
 186         .delay = 16000,
 187         .mask  = 0x7f,
 188         .map   = max77686_map,
 189         .alarm_enable_reg  = false,
 190         .rtc_irq_from_platform = false,
 191         .alarm_pending_status_reg = MAX77686_REG_STATUS2,
 192         .rtc_i2c_addr = MAX77686_I2C_ADDR_RTC,
 193         .rtc_irq_chip = &max77686_rtc_irq_chip,
 194 };
 195
 196 static const struct max77686_rtc_driver_data max77620_drv_data = {
 197         .delay = 16000,
 198         .mask  = 0x7f,
 199         .map   = max77686_map,
 200         .alarm_enable_reg  = false,
 201         .rtc_irq_from_platform = true,
 202         .alarm_pending_status_reg = MAX77686_INVALID_REG,
 203         .rtc_i2c_addr = MAX77620_I2C_ADDR_RTC,
 204         .rtc_irq_chip = &max77686_rtc_irq_chip,
 205 };
 206
 207 static const unsigned int max77802_map[REG_RTC_END] = {
 208         [REG_RTC_CONTROLM]   = MAX77802_RTC_CONTROLM,
 209         [REG_RTC_CONTROL]    = MAX77802_RTC_CONTROL,
 210         [REG_RTC_UPDATE0]    = MAX77802_RTC_UPDATE0,
 211         [REG_WTSR_SMPL_CNTL] = MAX77802_WTSR_SMPL_CNTL,
 212         [REG_RTC_SEC]        = MAX77802_RTC_SEC,
 213         [REG_RTC_MIN]        = MAX77802_RTC_MIN,
 214         [REG_RTC_HOUR]       = MAX77802_RTC_HOUR,
 215         [REG_RTC_WEEKDAY]    = MAX77802_RTC_WEEKDAY,
 216         [REG_RTC_MONTH]      = MAX77802_RTC_MONTH,
 217         [REG_RTC_YEAR]       = MAX77802_RTC_YEAR,
 218         [REG_RTC_DATE]       = MAX77802_RTC_DATE,
 219         [REG_ALARM1_SEC]     = MAX77802_ALARM1_SEC,
 220         [REG_ALARM1_MIN]     = MAX77802_ALARM1_MIN,
 221         [REG_ALARM1_HOUR]    = MAX77802_ALARM1_HOUR,
 222         [REG_ALARM1_WEEKDAY] = MAX77802_ALARM1_WEEKDAY,
 223         [REG_ALARM1_MONTH]   = MAX77802_ALARM1_MONTH,
 224         [REG_ALARM1_YEAR]    = MAX77802_ALARM1_YEAR,
 225         [REG_ALARM1_DATE]    = MAX77802_ALARM1_DATE,
 226         [REG_ALARM2_SEC]     = MAX77802_ALARM2_SEC,
 227         [REG_ALARM2_MIN]     = MAX77802_ALARM2_MIN,
 228         [REG_ALARM2_HOUR]    = MAX77802_ALARM2_HOUR,
 229         [REG_ALARM2_WEEKDAY] = MAX77802_ALARM2_WEEKDAY,
 230         [REG_ALARM2_MONTH]   = MAX77802_ALARM2_MONTH,
 231         [REG_ALARM2_YEAR]    = MAX77802_ALARM2_YEAR,
 232         [REG_ALARM2_DATE]    = MAX77802_ALARM2_DATE,
 233         [REG_RTC_AE1]        = MAX77802_RTC_AE1,
 234 };
 235
 236 static const struct regmap_irq_chip max77802_rtc_irq_chip = {
 237         .name           = "max77802-rtc",
 238         .status_base    = MAX77802_RTC_INT,
 239         .mask_base      = MAX77802_RTC_INTM,
 240         .num_regs       = 1,
 241         .irqs           = max77686_rtc_irqs, /* same masks as 77686 */
 242         .num_irqs       = ARRAY_SIZE(max77686_rtc_irqs),
 243 };
 244
 245 static const struct max77686_rtc_driver_data max77802_drv_data = {
 246         .delay = 200,
 247         .mask  = 0xff,
 248         .map   = max77802_map,
 249         .alarm_enable_reg  = true,
 250         .rtc_irq_from_platform = false,
 251         .alarm_pending_status_reg = MAX77686_REG_STATUS2,
 252         .rtc_i2c_addr = MAX77686_INVALID_I2C_ADDR,
 253         .rtc_irq_chip = &max77802_rtc_irq_chip,
 254 };
 255
 256 static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
 257                                     struct max77686_rtc_info *info)
 258 {
 259         u8 mask = info->drv_data->mask;
 260
 261         tm->tm_sec = data[RTC_SEC] & mask;
 262         tm->tm_min = data[RTC_MIN] & mask;
 263         if (info->rtc_24hr_mode) {
 264                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
 265         } else {
 266                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
 267                 if (data[RTC_HOUR] & HOUR_PM_MASK)
 268                         tm->tm_hour += 12;
 269         }
 270
 271         /* Only a single bit is set in data[], so fls() would be equivalent */
 272         tm->tm_wday = ffs(data[RTC_WEEKDAY] & mask) - 1;
 273         tm->tm_mday = data[RTC_DATE] & 0x1f;
 274         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
 275         tm->tm_year = data[RTC_YEAR] & mask;
 276         tm->tm_yday = 0;
 277         tm->tm_isdst = 0;
 278
 279         /*
 280          * MAX77686 uses 1 bit from sec/min/hour/etc RTC registers and the
 281          * year values are just 0..99 so add 100 to support up to 2099.
 282          */
 283         if (!info->drv_data->alarm_enable_reg)
 284                 tm->tm_year += 100;
 285 }
 286
 287 static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data,
 288                                    struct max77686_rtc_info *info)
 289 {
 290         data[RTC_SEC] = tm->tm_sec;
 291         data[RTC_MIN] = tm->tm_min;
 292         data[RTC_HOUR] = tm->tm_hour;
 293         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
 294         data[RTC_DATE] = tm->tm_mday;
 295         data[RTC_MONTH] = tm->tm_mon + 1;
 296
 297         if (info->drv_data->alarm_enable_reg) {
 298                 data[RTC_YEAR] = tm->tm_year;
 299                 return 0;
 300         }
 301
 302         data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
 303
 304         if (tm->tm_year < 100) {
 305                 dev_err(info->dev, "RTC cannot handle the year %d.\n",
 306                         1900 + tm->tm_year);
 307                 return -EINVAL;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int max77686_rtc_update(struct max77686_rtc_info *info,
 314                                enum MAX77686_RTC_OP op)
 315 {
 316         int ret;
 317         unsigned int data;
 318         unsigned long delay = info->drv_data->delay;
 319
 320         if (op == MAX77686_RTC_WRITE)
 321                 data = 1 << RTC_UDR_SHIFT;
 322         else
 323                 data = 1 << RTC_RBUDR_SHIFT;
 324
 325         ret = regmap_update_bits(info->rtc_regmap,
 326                                  info->drv_data->map[REG_RTC_UPDATE0],
 327                                  data, data);
 328         if (ret < 0)
 329                 dev_err(info->dev, "Fail to write update reg(ret=%d, data=0x%x)\n",
 330                         ret, data);
 331         else {
 332                 /* Minimum delay required before RTC update. */
 333                 usleep_range(delay, delay * 2);
 334         }
 335
 336         return ret;
 337 }
 338
 339 static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm)
 340 {
 341         struct max77686_rtc_info *info = dev_get_drvdata(dev);
 342         u8 data[RTC_NR_TIME];
 343         int ret;
 344
 345         mutex_lock(&info->lock);
 346
 347         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
 348         if (ret < 0)
 349                 goto out;
 350
 351         ret = regmap_bulk_read(info->rtc_regmap,
 352                                info->drv_data->map[REG_RTC_SEC],
 353                                data, ARRAY_SIZE(data));
 354         if (ret < 0) {
 355                 dev_err(info->dev, "Fail to read time reg(%d)\n", ret);
 356                 goto out;
 357         }
 358
 359         max77686_rtc_data_to_tm(data, tm, info);
 360
 361 out:
 362         mutex_unlock(&info->lock);
 363         return ret;
 364 }
 365
 366 static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
 367 {
 368         struct max77686_rtc_info *info = dev_get_drvdata(dev);
 369         u8 data[RTC_NR_TIME];
 370         int ret;
 371
 372         ret = max77686_rtc_tm_to_data(tm, data, info);
 373         if (ret < 0)
 374                 return ret;
 375
 376         mutex_lock(&info->lock);
 377
 378         ret = regmap_bulk_write(info->rtc_regmap,
 379                                 info->drv_data->map[REG_RTC_SEC],
 380                                 data, ARRAY_SIZE(data));
 381         if (ret < 0) {
 382                 dev_err(info->dev, "Fail to write time reg(%d)\n", ret);
 383                 goto out;
 384         }
 385
 386         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
 387
 388 out:
 389         mutex_unlock(&info->lock);
 390         return ret;
 391 }
 392
 393 static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 394 {
 395         struct max77686_rtc_info *info = dev_get_drvdata(dev);
 396         u8 data[RTC_NR_TIME];
 397         unsigned int val;
 398         const unsigned int *map = info->drv_data->map;
 399         int i, ret;
 400
 401         mutex_lock(&info->lock);
 402
 403         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
 404         if (ret < 0)
 405                 goto out;
 406
 407         ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
 408                                data, ARRAY_SIZE(data));
 409         if (ret < 0) {
 410                 dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
 411                 goto out;
 412         }
 413
 414         max77686_rtc_data_to_tm(data, &alrm->time, info);
 415
 416         alrm->enabled = 0;
 417
 418         if (info->drv_data->alarm_enable_reg) {
 419                 if (map[REG_RTC_AE1] == REG_RTC_NONE) {
 420                         ret = -EINVAL;
 421                         dev_err(info->dev,
 422                                 "alarm enable register not set(%d)\n", ret);
 423                         goto out;
 424                 }
 425
 426                 ret = regmap_read(info->rtc_regmap, map[REG_RTC_AE1], &val);
 427                 if (ret < 0) {
 428                         dev_err(info->dev,
 429                                 "fail to read alarm enable(%d)\n", ret);
 430                         goto out;
 431                 }
 432
 433                 if (val)
 434                         alrm->enabled = 1;
 435         } else {
 436                 for (i = 0; i < ARRAY_SIZE(data); i++) {
 437                         if (data[i] & ALARM_ENABLE_MASK) {
 438                                 alrm->enabled = 1;
 439                                 break;
 440                         }
 441                 }
 442         }
 443
 444         alrm->pending = 0;
 445
 446         if (info->drv_data->alarm_pending_status_reg == MAX77686_INVALID_REG)
 447                 goto out;
 448
 449         ret = regmap_read(info->regmap,
 450                           info->drv_data->alarm_pending_status_reg, &val);
 451         if (ret < 0) {
 452                 dev_err(info->dev,
 453                         "Fail to read alarm pending status reg(%d)\n", ret);
 454                 goto out;
 455         }
 456
 457         if (val & (1 << 4)) /* RTCA1 */
 458                 alrm->pending = 1;
 459
 460 out:
 461         mutex_unlock(&info->lock);
 462         return ret;
 463 }
 464
 465 static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
 466 {
 467         u8 data[RTC_NR_TIME];
 468         int ret, i;
 469         struct rtc_time tm;
 470         const unsigned int *map = info->drv_data->map;
 471
 472         if (!mutex_is_locked(&info->lock))
 473                 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
 474
 475         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
 476         if (ret < 0)
 477                 goto out;
 478
 479         if (info->drv_data->alarm_enable_reg) {
 480                 if (map[REG_RTC_AE1] == REG_RTC_NONE) {
 481                         ret = -EINVAL;
 482                         dev_err(info->dev,
 483                                 "alarm enable register not set(%d)\n", ret);
 484                         goto out;
 485                 }
 486
 487                 ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1], 0);
 488         } else {
 489                 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
 490                                        data, ARRAY_SIZE(data));
 491                 if (ret < 0) {
 492                         dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
 493                         goto out;
 494                 }
 495
 496                 max77686_rtc_data_to_tm(data, &tm, info);
 497
 498                 for (i = 0; i < ARRAY_SIZE(data); i++)
 499                         data[i] &= ~ALARM_ENABLE_MASK;
 500
 501                 ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
 502                                         data, ARRAY_SIZE(data));
 503         }
 504
 505         if (ret < 0) {
 506                 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
 507                 goto out;
 508         }
 509
 510         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
 511 out:
 512         return ret;
 513 }
 514
 515 static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
 516 {
 517         u8 data[RTC_NR_TIME];
 518         int ret;
 519         struct rtc_time tm;
 520         const unsigned int *map = info->drv_data->map;
 521
 522         if (!mutex_is_locked(&info->lock))
 523                 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
 524
 525         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
 526         if (ret < 0)
 527                 goto out;
 528
 529         if (info->drv_data->alarm_enable_reg) {
 530                 ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1],
 531                                    MAX77802_ALARM_ENABLE_VALUE);
 532         } else {
 533                 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
 534                                        data, ARRAY_SIZE(data));
 535                 if (ret < 0) {
 536                         dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
 537                         goto out;
 538                 }
 539
 540                 max77686_rtc_data_to_tm(data, &tm, info);
 541
 542                 data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
 543                 data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
 544                 data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
 545                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
 546                 if (data[RTC_MONTH] & 0xf)
 547                         data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
 548                 if (data[RTC_YEAR] & info->drv_data->mask)
 549                         data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
 550                 if (data[RTC_DATE] & 0x1f)
 551                         data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
 552
 553                 ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
 554                                         data, ARRAY_SIZE(data));
 555         }
 556
 557         if (ret < 0) {
 558                 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
 559                 goto out;
 560         }
 561
 562         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
 563 out:
 564         return ret;
 565 }
 566
 567 static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 568 {
 569         struct max77686_rtc_info *info = dev_get_drvdata(dev);
 570         u8 data[RTC_NR_TIME];
 571         int ret;
 572
 573         ret = max77686_rtc_tm_to_data(&alrm->time, data, info);
 574         if (ret < 0)
 575                 return ret;
 576
 577         mutex_lock(&info->lock);
 578
 579         ret = max77686_rtc_stop_alarm(info);
 580         if (ret < 0)
 581                 goto out;
 582
 583         ret = regmap_bulk_write(info->rtc_regmap,
 584                                 info->drv_data->map[REG_ALARM1_SEC],
 585                                 data, ARRAY_SIZE(data));
 586
 587         if (ret < 0) {
 588                 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
 589                 goto out;
 590         }
 591
 592         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
 593         if (ret < 0)
 594                 goto out;
 595
 596         if (alrm->enabled)
 597                 ret = max77686_rtc_start_alarm(info);
 598 out:
 599         mutex_unlock(&info->lock);
 600         return ret;
 601 }
 602
 603 static int max77686_rtc_alarm_irq_enable(struct device *dev,
 604                                          unsigned int enabled)
 605 {
 606         struct max77686_rtc_info *info = dev_get_drvdata(dev);
 607         int ret;
 608
 609         mutex_lock(&info->lock);
 610         if (enabled)
 611                 ret = max77686_rtc_start_alarm(info);
 612         else
 613                 ret = max77686_rtc_stop_alarm(info);
 614         mutex_unlock(&info->lock);
 615
 616         return ret;
 617 }
 618
 619 static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
 620 {
 621         struct max77686_rtc_info *info = data;
 622
 623         dev_dbg(info->dev, "RTC alarm IRQ: %d\n", irq);
 624
 625         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
 626
 627         return IRQ_HANDLED;
 628 }
 629
 630 static const struct rtc_class_ops max77686_rtc_ops = {
 631         .read_time = max77686_rtc_read_time,
 632         .set_time = max77686_rtc_set_time,
 633         .read_alarm = max77686_rtc_read_alarm,
 634         .set_alarm = max77686_rtc_set_alarm,
 635         .alarm_irq_enable = max77686_rtc_alarm_irq_enable,
 636 };
 637
 638 static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
 639 {
 640         u8 data[2];
 641         int ret;
 642
 643         /* Set RTC control register : Binary mode, 24hour mdoe */
 644         data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 645         data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 646
 647         info->rtc_24hr_mode = 1;
 648
 649         ret = regmap_bulk_write(info->rtc_regmap,
 650                                 info->drv_data->map[REG_RTC_CONTROLM],
 651                                 data, ARRAY_SIZE(data));
 652         if (ret < 0) {
 653                 dev_err(info->dev, "Fail to write controlm reg(%d)\n", ret);
 654                 return ret;
 655         }
 656
 657         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
 658         return ret;
 659 }
 660
 661 static const struct regmap_config max77686_rtc_regmap_config = {
 662         .reg_bits = 8,
 663         .val_bits = 8,
 664 };
 665
 666 static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
 667 {
 668         struct device *parent = info->dev->parent;
 669         struct i2c_client *parent_i2c = to_i2c_client(parent);
 670         int ret;
 671
 672         if (info->drv_data->rtc_irq_from_platform) {
 673                 struct platform_device *pdev = to_platform_device(info->dev);
 674
 675                 info->rtc_irq = platform_get_irq(pdev, 0);
 676                 if (info->rtc_irq < 0)
 677                         return info->rtc_irq;
 678         } else {
 679                 info->rtc_irq =  parent_i2c->irq;
 680         }
 681
 682         info->regmap = dev_get_regmap(parent, NULL);
 683         if (!info->regmap) {
 684                 dev_err(info->dev, "Failed to get rtc regmap\n");
 685                 return -ENODEV;
 686         }
 687
 688         if (info->drv_data->rtc_i2c_addr == MAX77686_INVALID_I2C_ADDR) {
 689                 info->rtc_regmap = info->regmap;
 690                 goto add_rtc_irq;
 691         }
 692
 693         info->rtc = devm_i2c_new_dummy_device(info->dev, parent_i2c->adapter,
 694                                               info->drv_data->rtc_i2c_addr);
 695         if (IS_ERR(info->rtc)) {
 696                 dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
 697                 return PTR_ERR(info->rtc);
 698         }
 699
 700         info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
 701                                                 &max77686_rtc_regmap_config);
 702         if (IS_ERR(info->rtc_regmap)) {
 703                 ret = PTR_ERR(info->rtc_regmap);
 704                 dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
 705                 return ret;
 706         }
 707
 708 add_rtc_irq:
 709         ret = regmap_add_irq_chip(info->rtc_regmap, info->rtc_irq,
 710                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
 711                                   IRQF_SHARED, 0, info->drv_data->rtc_irq_chip,
 712                                   &info->rtc_irq_data);
 713         if (ret < 0) {
 714                 dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);
 715                 return ret;
 716         }
 717
 718         return 0;
 719 }
 720
 721 static int max77686_rtc_probe(struct platform_device *pdev)
 722 {
 723         struct max77686_rtc_info *info;
 724         const struct platform_device_id *id = platform_get_device_id(pdev);
 725         int ret;
 726
 727         info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
 728                             GFP_KERNEL);
 729         if (!info)
 730                 return -ENOMEM;
 731
 732         mutex_init(&info->lock);
 733         info->dev = &pdev->dev;
 734         info->drv_data = (const struct max77686_rtc_driver_data *)
 735                 id->driver_data;
 736
 737         ret = max77686_init_rtc_regmap(info);
 738         if (ret < 0)
 739                 return ret;
 740
 741         platform_set_drvdata(pdev, info);
 742
 743         ret = max77686_rtc_init_reg(info);
 744         if (ret < 0) {
 745                 dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
 746                 goto err_rtc;
 747         }
 748
 749         device_init_wakeup(&pdev->dev, 1);
 750
 751         info->rtc_dev = devm_rtc_device_register(&pdev->dev, id->name,
 752                                         &max77686_rtc_ops, THIS_MODULE);
 753
 754         if (IS_ERR(info->rtc_dev)) {
 755                 ret = PTR_ERR(info->rtc_dev);
 756                 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
 757                 if (ret == 0)
 758                         ret = -EINVAL;
 759                 goto err_rtc;
 760         }
 761
 762         info->virq = regmap_irq_get_virq(info->rtc_irq_data,
 763                                          MAX77686_RTCIRQ_RTCA1);
 764         if (info->virq <= 0) {
 765                 ret = -ENXIO;
 766                 goto err_rtc;
 767         }
 768
 769         ret = request_threaded_irq(info->virq, NULL, max77686_rtc_alarm_irq, 0,
 770                                    "rtc-alarm1", info);
 771         if (ret < 0) {
 772                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
 773                         info->virq, ret);
 774                 goto err_rtc;
 775         }
 776
 777         return 0;
 778
 779 err_rtc:
 780         regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
 781
 782         return ret;
 783 }
 784
 785 static int max77686_rtc_remove(struct platform_device *pdev)
 786 {
 787         struct max77686_rtc_info *info = platform_get_drvdata(pdev);
 788
 789         free_irq(info->virq, info);
 790         regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
 791
 792         return 0;
 793 }
 794
 795 #ifdef CONFIG_PM_SLEEP
 796 static int max77686_rtc_suspend(struct device *dev)
 797 {
 798         if (device_may_wakeup(dev)) {
 799                 struct max77686_rtc_info *info = dev_get_drvdata(dev);
 800
 801                 return enable_irq_wake(info->virq);
 802         }
 803
 804         return 0;
 805 }
 806
 807 static int max77686_rtc_resume(struct device *dev)
 808 {
 809         if (device_may_wakeup(dev)) {
 810                 struct max77686_rtc_info *info = dev_get_drvdata(dev);
 811
 812                 return disable_irq_wake(info->virq);
 813         }
 814
 815         return 0;
 816 }
 817 #endif
 818
 819 static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
 820                          max77686_rtc_suspend, max77686_rtc_resume);
 821
 822 static const struct platform_device_id rtc_id[] = {
 823         { "max77686-rtc", .driver_data = (kernel_ulong_t)&max77686_drv_data, },
 824         { "max77802-rtc", .driver_data = (kernel_ulong_t)&max77802_drv_data, },
 825         { "max77620-rtc", .driver_data = (kernel_ulong_t)&max77620_drv_data, },
 826         {},
 827 };
 828 MODULE_DEVICE_TABLE(platform, rtc_id);
 829
 830 static struct platform_driver max77686_rtc_driver = {
 831         .driver         = {
 832                 .name   = "max77686-rtc",
 833                 .pm     = &max77686_rtc_pm_ops,
 834         },
 835         .probe          = max77686_rtc_probe,
 836         .remove         = max77686_rtc_remove,
 837         .id_table       = rtc_id,
 838 };
 839
 840 module_platform_driver(max77686_rtc_driver);
 841
 842 MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
 843 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 844 MODULE_LICENSE("GPL");