drivers/rtc/rtc-ab-eoz9.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Real Time Clock driver for AB-RTCMC-32.768kHz-EOZ9 chip.
   4  * Copyright (C) 2019 Orolia
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/rtc.h>
  10 #include <linux/i2c.h>
  11 #include <linux/bcd.h>
  12 #include <linux/of.h>
  13 #include <linux/regmap.h>
  14 #include <linux/bitfield.h>
  15 #include <linux/hwmon.h>
  16 #include <linux/hwmon-sysfs.h>
  17
  18 #define ABEOZ9_REG_CTRL1                0x00
  19 #define ABEOZ9_REG_CTRL1_MASK           GENMASK(7, 0)
  20 #define ABEOZ9_REG_CTRL1_WE             BIT(0)
  21 #define ABEOZ9_REG_CTRL1_TE             BIT(1)
  22 #define ABEOZ9_REG_CTRL1_TAR            BIT(2)
  23 #define ABEOZ9_REG_CTRL1_EERE           BIT(3)
  24 #define ABEOZ9_REG_CTRL1_SRON           BIT(4)
  25 #define ABEOZ9_REG_CTRL1_TD0            BIT(5)
  26 #define ABEOZ9_REG_CTRL1_TD1            BIT(6)
  27 #define ABEOZ9_REG_CTRL1_CLKINT         BIT(7)
  28
  29 #define ABEOZ9_REG_CTRL_INT             0x01
  30 #define ABEOZ9_REG_CTRL_INT_AIE         BIT(0)
  31 #define ABEOZ9_REG_CTRL_INT_TIE         BIT(1)
  32 #define ABEOZ9_REG_CTRL_INT_V1IE        BIT(2)
  33 #define ABEOZ9_REG_CTRL_INT_V2IE        BIT(3)
  34 #define ABEOZ9_REG_CTRL_INT_SRIE        BIT(4)
  35
  36 #define ABEOZ9_REG_CTRL_INT_FLAG        0x02
  37 #define ABEOZ9_REG_CTRL_INT_FLAG_AF     BIT(0)
  38 #define ABEOZ9_REG_CTRL_INT_FLAG_TF     BIT(1)
  39 #define ABEOZ9_REG_CTRL_INT_FLAG_V1IF   BIT(2)
  40 #define ABEOZ9_REG_CTRL_INT_FLAG_V2IF   BIT(3)
  41 #define ABEOZ9_REG_CTRL_INT_FLAG_SRF    BIT(4)
  42
  43 #define ABEOZ9_REG_CTRL_STATUS          0x03
  44 #define ABEOZ9_REG_CTRL_STATUS_V1F      BIT(2)
  45 #define ABEOZ9_REG_CTRL_STATUS_V2F      BIT(3)
  46 #define ABEOZ9_REG_CTRL_STATUS_SR       BIT(4)
  47 #define ABEOZ9_REG_CTRL_STATUS_PON      BIT(5)
  48 #define ABEOZ9_REG_CTRL_STATUS_EEBUSY   BIT(7)
  49
  50 #define ABEOZ9_REG_SEC                  0x08
  51 #define ABEOZ9_REG_MIN                  0x09
  52 #define ABEOZ9_REG_HOURS                0x0A
  53 #define ABEOZ9_HOURS_PM                 BIT(6)
  54 #define ABEOZ9_REG_DAYS                 0x0B
  55 #define ABEOZ9_REG_WEEKDAYS             0x0C
  56 #define ABEOZ9_REG_MONTHS               0x0D
  57 #define ABEOZ9_REG_YEARS                0x0E
  58
  59 #define ABEOZ9_SEC_LEN                  7
  60
  61 #define ABEOZ9_REG_ALARM_SEC            0x10
  62 #define ABEOZ9_BIT_ALARM_SEC            GENMASK(6, 0)
  63 #define ABEOZ9_REG_ALARM_MIN            0x11
  64 #define ABEOZ9_BIT_ALARM_MIN            GENMASK(6, 0)
  65 #define ABEOZ9_REG_ALARM_HOURS          0x12
  66 #define ABEOZ9_BIT_ALARM_HOURS_PM       BIT(5)
  67 #define ABEOZ9_BIT_ALARM_HOURS          GENMASK(4, 0)
  68 #define ABEOZ9_REG_ALARM_DAYS           0x13
  69 #define ABEOZ9_BIT_ALARM_DAYS           GENMASK(5, 0)
  70 #define ABEOZ9_REG_ALARM_WEEKDAYS       0x14
  71 #define ABEOZ9_BIT_ALARM_WEEKDAYS       GENMASK(2, 0)
  72 #define ABEOZ9_REG_ALARM_MONTHS         0x15
  73 #define ABEOZ9_BIT_ALARM_MONTHS         GENMASK(4, 0)
  74 #define ABEOZ9_REG_ALARM_YEARS          0x16
  75
  76 #define ABEOZ9_ALARM_LEN                7
  77 #define ABEOZ9_BIT_ALARM_AE             BIT(7)
  78
  79 #define ABEOZ9_REG_REG_TEMP             0x20
  80 #define ABEOZ953_TEMP_MAX               120
  81 #define ABEOZ953_TEMP_MIN               -60
  82
  83 #define ABEOZ9_REG_EEPROM               0x30
  84 #define ABEOZ9_REG_EEPROM_MASK          GENMASK(8, 0)
  85 #define ABEOZ9_REG_EEPROM_THP           BIT(0)
  86 #define ABEOZ9_REG_EEPROM_THE           BIT(1)
  87 #define ABEOZ9_REG_EEPROM_FD0           BIT(2)
  88 #define ABEOZ9_REG_EEPROM_FD1           BIT(3)
  89 #define ABEOZ9_REG_EEPROM_R1K           BIT(4)
  90 #define ABEOZ9_REG_EEPROM_R5K           BIT(5)
  91 #define ABEOZ9_REG_EEPROM_R20K          BIT(6)
  92 #define ABEOZ9_REG_EEPROM_R80K          BIT(7)
  93
  94 struct abeoz9_rtc_data {
  95         struct rtc_device *rtc;
  96         struct regmap *regmap;
  97         struct device *hwmon_dev;
  98 };
  99
 100 static int abeoz9_check_validity(struct device *dev)
 101 {
 102         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 103         struct regmap *regmap = data->regmap;
 104         int ret;
 105         int val;
 106
 107         ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
 108         if (ret < 0) {
 109                 dev_err(dev,
 110                         "unable to get CTRL_STATUS register (%d)\n", ret);
 111                 return ret;
 112         }
 113
 114         if (val & ABEOZ9_REG_CTRL_STATUS_PON) {
 115                 dev_warn(dev, "power-on reset detected, date is invalid\n");
 116                 return -EINVAL;
 117         }
 118
 119         if (val & ABEOZ9_REG_CTRL_STATUS_V1F) {
 120                 dev_warn(dev,
 121                          "voltage drops below VLOW1 threshold, date is invalid\n");
 122                 return -EINVAL;
 123         }
 124
 125         if ((val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
 126                 dev_warn(dev,
 127                          "voltage drops below VLOW2 threshold, date is invalid\n");
 128                 return -EINVAL;
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int abeoz9_reset_validity(struct regmap *regmap)
 135 {
 136         return regmap_update_bits(regmap, ABEOZ9_REG_CTRL_STATUS,
 137                                   ABEOZ9_REG_CTRL_STATUS_V1F |
 138                                   ABEOZ9_REG_CTRL_STATUS_V2F |
 139                                   ABEOZ9_REG_CTRL_STATUS_PON,
 140                                   0);
 141 }
 142
 143 static int abeoz9_rtc_get_time(struct device *dev, struct rtc_time *tm)
 144 {
 145         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 146         u8 regs[ABEOZ9_SEC_LEN];
 147         int ret;
 148
 149         ret = abeoz9_check_validity(dev);
 150         if (ret)
 151                 return ret;
 152
 153         ret = regmap_bulk_read(data->regmap, ABEOZ9_REG_SEC,
 154                                regs,
 155                                sizeof(regs));
 156         if (ret) {
 157                 dev_err(dev, "reading RTC time failed (%d)\n", ret);
 158                 return ret;
 159         }
 160
 161         tm->tm_sec = bcd2bin(regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] & 0x7F);
 162         tm->tm_min = bcd2bin(regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] & 0x7F);
 163
 164         if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM) {
 165                 tm->tm_hour =
 166                         bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & 0x1f);
 167                 if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM)
 168                         tm->tm_hour += 12;
 169         } else {
 170                 tm->tm_hour = bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC]);
 171         }
 172
 173         tm->tm_mday = bcd2bin(regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC]);
 174         tm->tm_wday = bcd2bin(regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC]);
 175         tm->tm_mon  = bcd2bin(regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC]) - 1;
 176         tm->tm_year = bcd2bin(regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC]) + 100;
 177
 178         return ret;
 179 }
 180
 181 static int abeoz9_rtc_set_time(struct device *dev, struct rtc_time *tm)
 182 {
 183         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 184         struct regmap *regmap = data->regmap;
 185         u8 regs[ABEOZ9_SEC_LEN];
 186         int ret;
 187
 188         regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_sec);
 189         regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_min);
 190         regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_hour);
 191         regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mday);
 192         regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_wday);
 193         regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mon + 1);
 194         regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_year - 100);
 195
 196         ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_SEC,
 197                                 regs,
 198                                 sizeof(regs));
 199
 200         if (ret) {
 201                 dev_err(dev, "set RTC time failed (%d)\n", ret);
 202                 return ret;
 203         }
 204
 205         return abeoz9_reset_validity(regmap);
 206 }
 207
 208 static int abeoz9_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 209 {
 210         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 211         struct regmap *regmap = data->regmap;
 212         u8 regs[ABEOZ9_ALARM_LEN];
 213         u8 val[2];
 214         int ret;
 215
 216         ret = abeoz9_check_validity(dev);
 217         if (ret)
 218                 return ret;
 219
 220         ret = regmap_bulk_read(regmap, ABEOZ9_REG_CTRL_INT, val, sizeof(val));
 221         if (ret)
 222                 return ret;
 223
 224         alarm->enabled = val[0] & ABEOZ9_REG_CTRL_INT_AIE;
 225         alarm->pending = val[1] & ABEOZ9_REG_CTRL_INT_FLAG_AF;
 226
 227         ret = regmap_bulk_read(regmap, ABEOZ9_REG_ALARM_SEC, regs, sizeof(regs));
 228         if (ret)
 229                 return ret;
 230
 231         alarm->time.tm_sec = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_SEC, regs[0]));
 232         alarm->time.tm_min = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_MIN, regs[1]));
 233         alarm->time.tm_hour = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_HOURS, regs[2]));
 234         if (FIELD_GET(ABEOZ9_BIT_ALARM_HOURS_PM, regs[2]))
 235                 alarm->time.tm_hour += 12;
 236
 237         alarm->time.tm_mday = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_DAYS, regs[3]));
 238
 239         return 0;
 240 }
 241
 242 static int abeoz9_rtc_alarm_irq_enable(struct device *dev, u32 enable)
 243 {
 244         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 245
 246         return regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT,
 247                                   ABEOZ9_REG_CTRL_INT_AIE,
 248                                   FIELD_PREP(ABEOZ9_REG_CTRL_INT_AIE, enable));
 249 }
 250
 251 static int abeoz9_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 252 {
 253         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 254         u8 regs[ABEOZ9_ALARM_LEN] = {0};
 255         int ret;
 256
 257         ret = regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
 258                                  ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
 259         if (ret)
 260                 return ret;
 261
 262         regs[0] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_SEC,
 263                                                    bin2bcd(alarm->time.tm_sec));
 264         regs[1] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_MIN,
 265                                                    bin2bcd(alarm->time.tm_min));
 266         regs[2] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_HOURS,
 267                                                    bin2bcd(alarm->time.tm_hour));
 268         regs[3] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_DAYS,
 269                                                    bin2bcd(alarm->time.tm_mday));
 270
 271         ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_ALARM_SEC, regs,
 272                                 sizeof(regs));
 273         if (ret)
 274                 return ret;
 275
 276         return abeoz9_rtc_alarm_irq_enable(dev, alarm->enabled);
 277 }
 278
 279 static irqreturn_t abeoz9_rtc_irq(int irq, void *dev)
 280 {
 281         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 282         unsigned int val;
 283         int ret;
 284
 285         ret = regmap_read(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, &val);
 286         if (ret)
 287                 return IRQ_NONE;
 288
 289         if (!FIELD_GET(ABEOZ9_REG_CTRL_INT_FLAG_AF, val))
 290                 return IRQ_NONE;
 291
 292         regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG,
 293                            ABEOZ9_REG_CTRL_INT_FLAG_AF, 0);
 294
 295         rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF);
 296
 297         return IRQ_HANDLED;
 298 }
 299
 300 static int abeoz9_trickle_parse_dt(struct device_node *node)
 301 {
 302         u32 ohms = 0;
 303
 304         if (of_property_read_u32(node, "trickle-resistor-ohms", &ohms))
 305                 return 0;
 306
 307         switch (ohms) {
 308         case 1000:
 309                 return ABEOZ9_REG_EEPROM_R1K;
 310         case 5000:
 311                 return ABEOZ9_REG_EEPROM_R5K;
 312         case 20000:
 313                 return ABEOZ9_REG_EEPROM_R20K;
 314         case 80000:
 315                 return ABEOZ9_REG_EEPROM_R80K;
 316         default:
 317                 return 0;
 318         }
 319 }
 320
 321 static int abeoz9_rtc_setup(struct device *dev, struct device_node *node)
 322 {
 323         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 324         struct regmap *regmap = data->regmap;
 325         int ret;
 326
 327         /* Enable Self Recovery, Clock for Watch and EEPROM refresh functions */
 328         ret = regmap_update_bits(regmap, ABEOZ9_REG_CTRL1,
 329                                  ABEOZ9_REG_CTRL1_MASK,
 330                                  ABEOZ9_REG_CTRL1_WE |
 331                                  ABEOZ9_REG_CTRL1_EERE |
 332                                  ABEOZ9_REG_CTRL1_SRON);
 333         if (ret < 0) {
 334                 dev_err(dev, "unable to set CTRL_1 register (%d)\n", ret);
 335                 return ret;
 336         }
 337
 338         ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT, 0);
 339         if (ret < 0) {
 340                 dev_err(dev,
 341                         "unable to set control CTRL_INT register (%d)\n",
 342                         ret);
 343                 return ret;
 344         }
 345
 346         ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT_FLAG, 0);
 347         if (ret < 0) {
 348                 dev_err(dev,
 349                         "unable to set control CTRL_INT_FLAG register (%d)\n",
 350                         ret);
 351                 return ret;
 352         }
 353
 354         ret = abeoz9_trickle_parse_dt(node);
 355
 356         /* Enable built-in termometer */
 357         ret |= ABEOZ9_REG_EEPROM_THE;
 358
 359         ret = regmap_update_bits(regmap, ABEOZ9_REG_EEPROM,
 360                                  ABEOZ9_REG_EEPROM_MASK,
 361                                  ret);
 362         if (ret < 0) {
 363                 dev_err(dev, "unable to set EEPROM register (%d)\n", ret);
 364                 return ret;
 365         }
 366
 367         return ret;
 368 }
 369
 370 static const struct rtc_class_ops rtc_ops = {
 371         .read_time = abeoz9_rtc_get_time,
 372         .set_time = abeoz9_rtc_set_time,
 373         .read_alarm = abeoz9_rtc_read_alarm,
 374         .set_alarm = abeoz9_rtc_set_alarm,
 375         .alarm_irq_enable = abeoz9_rtc_alarm_irq_enable,
 376 };
 377
 378 static const struct regmap_config abeoz9_rtc_regmap_config = {
 379         .reg_bits = 8,
 380         .val_bits = 8,
 381         .max_register = 0x3f,
 382 };
 383
 384 #if IS_REACHABLE(CONFIG_HWMON)
 385
 386 static int abeoz9z3_temp_read(struct device *dev,
 387                               enum hwmon_sensor_types type,
 388                               u32 attr, int channel, long *temp)
 389 {
 390         struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
 391         struct regmap *regmap = data->regmap;
 392         int ret;
 393         unsigned int val;
 394
 395         ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
 396         if (ret < 0)
 397                 return ret;
 398
 399         if ((val & ABEOZ9_REG_CTRL_STATUS_V1F) ||
 400             (val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
 401                 dev_err(dev,
 402                         "thermometer might be disabled due to low voltage\n");
 403                 return -EINVAL;
 404         }
 405
 406         switch (attr) {
 407         case hwmon_temp_input:
 408                 ret = regmap_read(regmap, ABEOZ9_REG_REG_TEMP, &val);
 409                 if (ret < 0)
 410                         return ret;
 411                 *temp = 1000 * (val + ABEOZ953_TEMP_MIN);
 412                 return 0;
 413         case hwmon_temp_max:
 414                 *temp = 1000 * ABEOZ953_TEMP_MAX;
 415                 return 0;
 416         case hwmon_temp_min:
 417                 *temp = 1000 * ABEOZ953_TEMP_MIN;
 418                 return 0;
 419         default:
 420                 return -EOPNOTSUPP;
 421         }
 422 }
 423
 424 static umode_t abeoz9_is_visible(const void *data,
 425                                  enum hwmon_sensor_types type,
 426                                  u32 attr, int channel)
 427 {
 428         switch (attr) {
 429         case hwmon_temp_input:
 430         case hwmon_temp_max:
 431         case hwmon_temp_min:
 432                 return 0444;
 433         default:
 434                 return 0;
 435         }
 436 }
 437
 438 static const u32 abeoz9_chip_config[] = {
 439         HWMON_C_REGISTER_TZ,
 440         0
 441 };
 442
 443 static const struct hwmon_channel_info abeoz9_chip = {
 444         .type = hwmon_chip,
 445         .config = abeoz9_chip_config,
 446 };
 447
 448 static const u32 abeoz9_temp_config[] = {
 449         HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN,
 450         0
 451 };
 452
 453 static const struct hwmon_channel_info abeoz9_temp = {
 454         .type = hwmon_temp,
 455         .config = abeoz9_temp_config,
 456 };
 457
 458 static const struct hwmon_channel_info * const abeoz9_info[] = {
 459         &abeoz9_chip,
 460         &abeoz9_temp,
 461         NULL
 462 };
 463
 464 static const struct hwmon_ops abeoz9_hwmon_ops = {
 465         .is_visible = abeoz9_is_visible,
 466         .read = abeoz9z3_temp_read,
 467 };
 468
 469 static const struct hwmon_chip_info abeoz9_chip_info = {
 470         .ops = &abeoz9_hwmon_ops,
 471         .info = abeoz9_info,
 472 };
 473
 474 static void abeoz9_hwmon_register(struct device *dev,
 475                                   struct abeoz9_rtc_data *data)
 476 {
 477         data->hwmon_dev =
 478                 devm_hwmon_device_register_with_info(dev,
 479                                                      "abeoz9",
 480                                                      data,
 481                                                      &abeoz9_chip_info,
 482                                                      NULL);
 483         if (IS_ERR(data->hwmon_dev)) {
 484                 dev_warn(dev, "unable to register hwmon device %ld\n",
 485                          PTR_ERR(data->hwmon_dev));
 486         }
 487 }
 488
 489 #else
 490
 491 static void abeoz9_hwmon_register(struct device *dev,
 492                                   struct abeoz9_rtc_data *data)
 493 {
 494 }
 495
 496 #endif
 497
 498 static int abeoz9_probe(struct i2c_client *client)
 499 {
 500         struct abeoz9_rtc_data *data = NULL;
 501         struct device *dev = &client->dev;
 502         struct regmap *regmap;
 503         int ret;
 504
 505         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
 506                                      I2C_FUNC_SMBUS_BYTE_DATA |
 507                                      I2C_FUNC_SMBUS_I2C_BLOCK))
 508                 return -ENODEV;
 509
 510         regmap = devm_regmap_init_i2c(client, &abeoz9_rtc_regmap_config);
 511         if (IS_ERR(regmap)) {
 512                 ret = PTR_ERR(regmap);
 513                 dev_err(dev, "regmap allocation failed: %d\n", ret);
 514                 return ret;
 515         }
 516
 517         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 518         if (!data)
 519                 return -ENOMEM;
 520
 521         data->regmap = regmap;
 522         dev_set_drvdata(dev, data);
 523
 524         ret = abeoz9_rtc_setup(dev, client->dev.of_node);
 525         if (ret)
 526                 return ret;
 527
 528         data->rtc = devm_rtc_allocate_device(dev);
 529         ret = PTR_ERR_OR_ZERO(data->rtc);
 530         if (ret)
 531                 return ret;
 532
 533         data->rtc->ops = &rtc_ops;
 534         data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 535         data->rtc->range_max = RTC_TIMESTAMP_END_2099;
 536         clear_bit(RTC_FEATURE_ALARM, data->rtc->features);
 537
 538         if (client->irq > 0) {
 539                 unsigned long irqflags = IRQF_TRIGGER_LOW;
 540
 541                 if (dev_fwnode(&client->dev))
 542                         irqflags = 0;
 543
 544                 ret = devm_request_threaded_irq(dev, client->irq, NULL,
 545                                                 abeoz9_rtc_irq,
 546                                                 irqflags | IRQF_ONESHOT,
 547                                                 dev_name(dev), dev);
 548                 if (ret) {
 549                         dev_err(dev, "failed to request alarm irq\n");
 550                         return ret;
 551                 }
 552         } else {
 553                 clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, data->rtc->features);
 554         }
 555
 556         if (client->irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
 557                 ret = device_init_wakeup(dev, true);
 558                 set_bit(RTC_FEATURE_ALARM, data->rtc->features);
 559         }
 560
 561         ret = devm_rtc_register_device(data->rtc);
 562         if (ret)
 563                 return ret;
 564
 565         abeoz9_hwmon_register(dev, data);
 566         return 0;
 567 }
 568
 569 #ifdef CONFIG_OF
 570 static const struct of_device_id abeoz9_dt_match[] = {
 571         { .compatible = "abracon,abeoz9" },
 572         { },
 573 };
 574 MODULE_DEVICE_TABLE(of, abeoz9_dt_match);
 575 #endif
 576
 577 static const struct i2c_device_id abeoz9_id[] = {
 578         { "abeoz9", 0 },
 579         { }
 580 };
 581
 582 static struct i2c_driver abeoz9_driver = {
 583         .driver = {
 584                 .name = "rtc-ab-eoz9",
 585                 .of_match_table = of_match_ptr(abeoz9_dt_match),
 586         },
 587         .probe = abeoz9_probe,
 588         .id_table = abeoz9_id,
 589 };
 590
 591 module_i2c_driver(abeoz9_driver);
 592
 593 MODULE_AUTHOR("Artem Panfilov <panfilov.artyom@gmail.com>");
 594 MODULE_DESCRIPTION("Abracon AB-RTCMC-32.768kHz-EOZ9 RTC driver");
 595 MODULE_LICENSE("GPL");