drivers/rtc/rtc-abx80x.c

   1 /*
   2  * A driver for the I2C members of the Abracon AB x8xx RTC family,
   3  * and compatible: AB 1805 and AB 0805
   4  *
   5  * Copyright 2014-2015 Macq S.A.
   6  *
   7  * Author: Philippe De Muyter <phdm@macqel.be>
   8  * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/bcd.h>
  17 #include <linux/i2c.h>
  18 #include <linux/module.h>
  19 #include <linux/rtc.h>
  20
  21 #define ABX8XX_REG_HTH          0x00
  22 #define ABX8XX_REG_SC           0x01
  23 #define ABX8XX_REG_MN           0x02
  24 #define ABX8XX_REG_HR           0x03
  25 #define ABX8XX_REG_DA           0x04
  26 #define ABX8XX_REG_MO           0x05
  27 #define ABX8XX_REG_YR           0x06
  28 #define ABX8XX_REG_WD           0x07
  29
  30 #define ABX8XX_REG_AHTH         0x08
  31 #define ABX8XX_REG_ASC          0x09
  32 #define ABX8XX_REG_AMN          0x0a
  33 #define ABX8XX_REG_AHR          0x0b
  34 #define ABX8XX_REG_ADA          0x0c
  35 #define ABX8XX_REG_AMO          0x0d
  36 #define ABX8XX_REG_AWD          0x0e
  37
  38 #define ABX8XX_REG_STATUS       0x0f
  39 #define ABX8XX_STATUS_AF        BIT(2)
  40
  41 #define ABX8XX_REG_CTRL1        0x10
  42 #define ABX8XX_CTRL_WRITE       BIT(0)
  43 #define ABX8XX_CTRL_ARST        BIT(2)
  44 #define ABX8XX_CTRL_12_24       BIT(6)
  45
  46 #define ABX8XX_REG_IRQ          0x12
  47 #define ABX8XX_IRQ_AIE          BIT(2)
  48 #define ABX8XX_IRQ_IM_1_4       (0x3 << 5)
  49
  50 #define ABX8XX_REG_CD_TIMER_CTL 0x18
  51
  52 #define ABX8XX_REG_OSC          0x1c
  53 #define ABX8XX_OSC_FOS          BIT(3)
  54 #define ABX8XX_OSC_BOS          BIT(4)
  55 #define ABX8XX_OSC_ACAL_512     BIT(5)
  56 #define ABX8XX_OSC_ACAL_1024    BIT(6)
  57
  58 #define ABX8XX_OSC_OSEL         BIT(7)
  59
  60 #define ABX8XX_REG_OSS          0x1d
  61 #define ABX8XX_OSS_OF           BIT(1)
  62 #define ABX8XX_OSS_OMODE        BIT(4)
  63
  64 #define ABX8XX_REG_CFG_KEY      0x1f
  65 #define ABX8XX_CFG_KEY_OSC      0xa1
  66 #define ABX8XX_CFG_KEY_MISC     0x9d
  67
  68 #define ABX8XX_REG_ID0          0x28
  69
  70 #define ABX8XX_REG_TRICKLE      0x20
  71 #define ABX8XX_TRICKLE_CHARGE_ENABLE    0xa0
  72 #define ABX8XX_TRICKLE_STANDARD_DIODE   0x8
  73 #define ABX8XX_TRICKLE_SCHOTTKY_DIODE   0x4
  74
  75 static u8 trickle_resistors[] = {0, 3, 6, 11};
  76
  77 enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
  78         AB1801, AB1803, AB1804, AB1805, ABX80X};
  79
  80 struct abx80x_cap {
  81         u16 pn;
  82         bool has_tc;
  83 };
  84
  85 static struct abx80x_cap abx80x_caps[] = {
  86         [AB0801] = {.pn = 0x0801},
  87         [AB0803] = {.pn = 0x0803},
  88         [AB0804] = {.pn = 0x0804, .has_tc = true},
  89         [AB0805] = {.pn = 0x0805, .has_tc = true},
  90         [AB1801] = {.pn = 0x1801},
  91         [AB1803] = {.pn = 0x1803},
  92         [AB1804] = {.pn = 0x1804, .has_tc = true},
  93         [AB1805] = {.pn = 0x1805, .has_tc = true},
  94         [ABX80X] = {.pn = 0}
  95 };
  96
  97 static int abx80x_is_rc_mode(struct i2c_client *client)
  98 {
  99         int flags = 0;
 100
 101         flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
 102         if (flags < 0) {
 103                 dev_err(&client->dev,
 104                         "Failed to read autocalibration attribute\n");
 105                 return flags;
 106         }
 107
 108         return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
 109 }
 110
 111 static int abx80x_enable_trickle_charger(struct i2c_client *client,
 112                                          u8 trickle_cfg)
 113 {
 114         int err;
 115
 116         /*
 117          * Write the configuration key register to enable access to the Trickle
 118          * register
 119          */
 120         err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
 121                                         ABX8XX_CFG_KEY_MISC);
 122         if (err < 0) {
 123                 dev_err(&client->dev, "Unable to write configuration key\n");
 124                 return -EIO;
 125         }
 126
 127         err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
 128                                         ABX8XX_TRICKLE_CHARGE_ENABLE |
 129                                         trickle_cfg);
 130         if (err < 0) {
 131                 dev_err(&client->dev, "Unable to write trickle register\n");
 132                 return -EIO;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
 139 {
 140         struct i2c_client *client = to_i2c_client(dev);
 141         unsigned char buf[8];
 142         int err, flags, rc_mode = 0;
 143
 144         /* Read the Oscillator Failure only in XT mode */
 145         rc_mode = abx80x_is_rc_mode(client);
 146         if (rc_mode < 0)
 147                 return rc_mode;
 148
 149         if (!rc_mode) {
 150                 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
 151                 if (flags < 0)
 152                         return flags;
 153
 154                 if (flags & ABX8XX_OSS_OF) {
 155                         dev_err(dev, "Oscillator failure, data is invalid.\n");
 156                         return -EINVAL;
 157                 }
 158         }
 159
 160         err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
 161                                             sizeof(buf), buf);
 162         if (err < 0) {
 163                 dev_err(&client->dev, "Unable to read date\n");
 164                 return -EIO;
 165         }
 166
 167         tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
 168         tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
 169         tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
 170         tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
 171         tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
 172         tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
 173         tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;
 174
 175         return 0;
 176 }
 177
 178 static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 179 {
 180         struct i2c_client *client = to_i2c_client(dev);
 181         unsigned char buf[8];
 182         int err, flags;
 183
 184         if (tm->tm_year < 100)
 185                 return -EINVAL;
 186
 187         buf[ABX8XX_REG_HTH] = 0;
 188         buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
 189         buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
 190         buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
 191         buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
 192         buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
 193         buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
 194         buf[ABX8XX_REG_WD] = tm->tm_wday;
 195
 196         err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
 197                                              sizeof(buf), buf);
 198         if (err < 0) {
 199                 dev_err(&client->dev, "Unable to write to date registers\n");
 200                 return -EIO;
 201         }
 202
 203         /* Clear the OF bit of Oscillator Status Register */
 204         flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
 205         if (flags < 0)
 206                 return flags;
 207
 208         err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
 209                                         flags & ~ABX8XX_OSS_OF);
 210         if (err < 0) {
 211                 dev_err(&client->dev, "Unable to write oscillator status register\n");
 212                 return err;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
 219 {
 220         struct i2c_client *client = dev_id;
 221         struct rtc_device *rtc = i2c_get_clientdata(client);
 222         int status;
 223
 224         status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
 225         if (status < 0)
 226                 return IRQ_NONE;
 227
 228         if (status & ABX8XX_STATUS_AF)
 229                 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
 230
 231         i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
 232
 233         return IRQ_HANDLED;
 234 }
 235
 236 static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 237 {
 238         struct i2c_client *client = to_i2c_client(dev);
 239         unsigned char buf[7];
 240
 241         int irq_mask, err;
 242
 243         if (client->irq <= 0)
 244                 return -EINVAL;
 245
 246         err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
 247                                             sizeof(buf), buf);
 248         if (err)
 249                 return err;
 250
 251         irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
 252         if (irq_mask < 0)
 253                 return irq_mask;
 254
 255         t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
 256         t->time.tm_min = bcd2bin(buf[1] & 0x7F);
 257         t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
 258         t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
 259         t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
 260         t->time.tm_wday = buf[5] & 0x7;
 261
 262         t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
 263         t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;
 264
 265         return err;
 266 }
 267
 268 static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 269 {
 270         struct i2c_client *client = to_i2c_client(dev);
 271         u8 alarm[6];
 272         int err;
 273
 274         if (client->irq <= 0)
 275                 return -EINVAL;
 276
 277         alarm[0] = 0x0;
 278         alarm[1] = bin2bcd(t->time.tm_sec);
 279         alarm[2] = bin2bcd(t->time.tm_min);
 280         alarm[3] = bin2bcd(t->time.tm_hour);
 281         alarm[4] = bin2bcd(t->time.tm_mday);
 282         alarm[5] = bin2bcd(t->time.tm_mon + 1);
 283
 284         err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
 285                                              sizeof(alarm), alarm);
 286         if (err < 0) {
 287                 dev_err(&client->dev, "Unable to write alarm registers\n");
 288                 return -EIO;
 289         }
 290
 291         if (t->enabled) {
 292                 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
 293                                                 (ABX8XX_IRQ_IM_1_4 |
 294                                                  ABX8XX_IRQ_AIE));
 295                 if (err)
 296                         return err;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static int abx80x_rtc_set_autocalibration(struct device *dev,
 303                                           int autocalibration)
 304 {
 305         struct i2c_client *client = to_i2c_client(dev);
 306         int retval, flags = 0;
 307
 308         if ((autocalibration != 0) && (autocalibration != 1024) &&
 309             (autocalibration != 512)) {
 310                 dev_err(dev, "autocalibration value outside permitted range\n");
 311                 return -EINVAL;
 312         }
 313
 314         flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
 315         if (flags < 0)
 316                 return flags;
 317
 318         if (autocalibration == 0) {
 319                 flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
 320         } else if (autocalibration == 1024) {
 321                 /* 1024 autocalibration is 0x10 */
 322                 flags |= ABX8XX_OSC_ACAL_1024;
 323                 flags &= ~(ABX8XX_OSC_ACAL_512);
 324         } else {
 325                 /* 512 autocalibration is 0x11 */
 326                 flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
 327         }
 328
 329         /* Unlock write access to Oscillator Control Register */
 330         retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
 331                                            ABX8XX_CFG_KEY_OSC);
 332         if (retval < 0) {
 333                 dev_err(dev, "Failed to write CONFIG_KEY register\n");
 334                 return retval;
 335         }
 336
 337         retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
 338
 339         return retval;
 340 }
 341
 342 static int abx80x_rtc_get_autocalibration(struct device *dev)
 343 {
 344         struct i2c_client *client = to_i2c_client(dev);
 345         int flags = 0, autocalibration;
 346
 347         flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
 348         if (flags < 0)
 349                 return flags;
 350
 351         if (flags & ABX8XX_OSC_ACAL_512)
 352                 autocalibration = 512;
 353         else if (flags & ABX8XX_OSC_ACAL_1024)
 354                 autocalibration = 1024;
 355         else
 356                 autocalibration = 0;
 357
 358         return autocalibration;
 359 }
 360
 361 static ssize_t autocalibration_store(struct device *dev,
 362                                      struct device_attribute *attr,
 363                                      const char *buf, size_t count)
 364 {
 365         int retval;
 366         unsigned long autocalibration = 0;
 367
 368         retval = kstrtoul(buf, 10, &autocalibration);
 369         if (retval < 0) {
 370                 dev_err(dev, "Failed to store RTC autocalibration attribute\n");
 371                 return -EINVAL;
 372         }
 373
 374         retval = abx80x_rtc_set_autocalibration(dev, autocalibration);
 375
 376         return retval ? retval : count;
 377 }
 378
 379 static ssize_t autocalibration_show(struct device *dev,
 380                                     struct device_attribute *attr, char *buf)
 381 {
 382         int autocalibration = 0;
 383
 384         autocalibration = abx80x_rtc_get_autocalibration(dev);
 385         if (autocalibration < 0) {
 386                 dev_err(dev, "Failed to read RTC autocalibration\n");
 387                 sprintf(buf, "0\n");
 388                 return autocalibration;
 389         }
 390
 391         return sprintf(buf, "%d\n", autocalibration);
 392 }
 393
 394 static DEVICE_ATTR_RW(autocalibration);
 395
 396 static ssize_t oscillator_store(struct device *dev,
 397                                 struct device_attribute *attr,
 398                                 const char *buf, size_t count)
 399 {
 400         struct i2c_client *client = to_i2c_client(dev);
 401         int retval, flags, rc_mode = 0;
 402
 403         if (strncmp(buf, "rc", 2) == 0) {
 404                 rc_mode = 1;
 405         } else if (strncmp(buf, "xtal", 4) == 0) {
 406                 rc_mode = 0;
 407         } else {
 408                 dev_err(dev, "Oscillator selection value outside permitted ones\n");
 409                 return -EINVAL;
 410         }
 411
 412         flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
 413         if (flags < 0)
 414                 return flags;
 415
 416         if (rc_mode == 0)
 417                 flags &= ~(ABX8XX_OSC_OSEL);
 418         else
 419                 flags |= (ABX8XX_OSC_OSEL);
 420
 421         /* Unlock write access on Oscillator Control register */
 422         retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
 423                                            ABX8XX_CFG_KEY_OSC);
 424         if (retval < 0) {
 425                 dev_err(dev, "Failed to write CONFIG_KEY register\n");
 426                 return retval;
 427         }
 428
 429         retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
 430         if (retval < 0) {
 431                 dev_err(dev, "Failed to write Oscillator Control register\n");
 432                 return retval;
 433         }
 434
 435         return retval ? retval : count;
 436 }
 437
 438 static ssize_t oscillator_show(struct device *dev,
 439                                struct device_attribute *attr, char *buf)
 440 {
 441         int rc_mode = 0;
 442         struct i2c_client *client = to_i2c_client(dev);
 443
 444         rc_mode = abx80x_is_rc_mode(client);
 445
 446         if (rc_mode < 0) {
 447                 dev_err(dev, "Failed to read RTC oscillator selection\n");
 448                 sprintf(buf, "\n");
 449                 return rc_mode;
 450         }
 451
 452         if (rc_mode)
 453                 return sprintf(buf, "rc\n");
 454         else
 455                 return sprintf(buf, "xtal\n");
 456 }
 457
 458 static DEVICE_ATTR_RW(oscillator);
 459
 460 static struct attribute *rtc_calib_attrs[] = {
 461         &dev_attr_autocalibration.attr,
 462         &dev_attr_oscillator.attr,
 463         NULL,
 464 };
 465
 466 static const struct attribute_group rtc_calib_attr_group = {
 467         .attrs          = rtc_calib_attrs,
 468 };
 469
 470 static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
 471 {
 472         struct i2c_client *client = to_i2c_client(dev);
 473         int err;
 474
 475         if (enabled)
 476                 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
 477                                                 (ABX8XX_IRQ_IM_1_4 |
 478                                                  ABX8XX_IRQ_AIE));
 479         else
 480                 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
 481                                                 ABX8XX_IRQ_IM_1_4);
 482         return err;
 483 }
 484
 485 static const struct rtc_class_ops abx80x_rtc_ops = {
 486         .read_time      = abx80x_rtc_read_time,
 487         .set_time       = abx80x_rtc_set_time,
 488         .read_alarm     = abx80x_read_alarm,
 489         .set_alarm      = abx80x_set_alarm,
 490         .alarm_irq_enable = abx80x_alarm_irq_enable,
 491 };
 492
 493 static int abx80x_dt_trickle_cfg(struct device_node *np)
 494 {
 495         const char *diode;
 496         int trickle_cfg = 0;
 497         int i, ret;
 498         u32 tmp;
 499
 500         ret = of_property_read_string(np, "abracon,tc-diode", &diode);
 501         if (ret)
 502                 return ret;
 503
 504         if (!strcmp(diode, "standard"))
 505                 trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
 506         else if (!strcmp(diode, "schottky"))
 507                 trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
 508         else
 509                 return -EINVAL;
 510
 511         ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
 512         if (ret)
 513                 return ret;
 514
 515         for (i = 0; i < sizeof(trickle_resistors); i++)
 516                 if (trickle_resistors[i] == tmp)
 517                         break;
 518
 519         if (i == sizeof(trickle_resistors))
 520                 return -EINVAL;
 521
 522         return (trickle_cfg | i);
 523 }
 524
 525 static void rtc_calib_remove_sysfs_group(void *_dev)
 526 {
 527         struct device *dev = _dev;
 528
 529         sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group);
 530 }
 531
 532 static int abx80x_probe(struct i2c_client *client,
 533                         const struct i2c_device_id *id)
 534 {
 535         struct device_node *np = client->dev.of_node;
 536         struct rtc_device *rtc;
 537         int i, data, err, trickle_cfg = -EINVAL;
 538         char buf[7];
 539         unsigned int part = id->driver_data;
 540         unsigned int partnumber;
 541         unsigned int majrev, minrev;
 542         unsigned int lot;
 543         unsigned int wafer;
 544         unsigned int uid;
 545
 546         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 547                 return -ENODEV;
 548
 549         err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
 550                                             sizeof(buf), buf);
 551         if (err < 0) {
 552                 dev_err(&client->dev, "Unable to read partnumber\n");
 553                 return -EIO;
 554         }
 555
 556         partnumber = (buf[0] << 8) | buf[1];
 557         majrev = buf[2] >> 3;
 558         minrev = buf[2] & 0x7;
 559         lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
 560         uid = ((buf[4] & 0x7f) << 8) | buf[5];
 561         wafer = (buf[6] & 0x7c) >> 2;
 562         dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
 563                  partnumber, majrev, minrev, lot, wafer, uid);
 564
 565         data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
 566         if (data < 0) {
 567                 dev_err(&client->dev, "Unable to read control register\n");
 568                 return -EIO;
 569         }
 570
 571         err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
 572                                         ((data & ~(ABX8XX_CTRL_12_24 |
 573                                                    ABX8XX_CTRL_ARST)) |
 574                                          ABX8XX_CTRL_WRITE));
 575         if (err < 0) {
 576                 dev_err(&client->dev, "Unable to write control register\n");
 577                 return -EIO;
 578         }
 579
 580         /* part autodetection */
 581         if (part == ABX80X) {
 582                 for (i = 0; abx80x_caps[i].pn; i++)
 583                         if (partnumber == abx80x_caps[i].pn)
 584                                 break;
 585                 if (abx80x_caps[i].pn == 0) {
 586                         dev_err(&client->dev, "Unknown part: %04x\n",
 587                                 partnumber);
 588                         return -EINVAL;
 589                 }
 590                 part = i;
 591         }
 592
 593         if (partnumber != abx80x_caps[part].pn) {
 594                 dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
 595                         partnumber, abx80x_caps[part].pn);
 596                 return -EINVAL;
 597         }
 598
 599         if (np && abx80x_caps[part].has_tc)
 600                 trickle_cfg = abx80x_dt_trickle_cfg(np);
 601
 602         if (trickle_cfg > 0) {
 603                 dev_info(&client->dev, "Enabling trickle charger: %02x\n",
 604                          trickle_cfg);
 605                 abx80x_enable_trickle_charger(client, trickle_cfg);
 606         }
 607
 608         err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
 609                                         BIT(2));
 610         if (err)
 611                 return err;
 612
 613         rtc = devm_rtc_allocate_device(&client->dev);
 614         if (IS_ERR(rtc))
 615                 return PTR_ERR(rtc);
 616
 617         rtc->ops = &abx80x_rtc_ops;
 618
 619         i2c_set_clientdata(client, rtc);
 620
 621         if (client->irq > 0) {
 622                 dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
 623                 err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 624                                                 abx80x_handle_irq,
 625                                                 IRQF_SHARED | IRQF_ONESHOT,
 626                                                 "abx8xx",
 627                                                 client);
 628                 if (err) {
 629                         dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
 630                         client->irq = 0;
 631                 }
 632         }
 633
 634         /* Export sysfs entries */
 635         err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group);
 636         if (err) {
 637                 dev_err(&client->dev, "Failed to create sysfs group: %d\n",
 638                         err);
 639                 return err;
 640         }
 641
 642         err = devm_add_action_or_reset(&client->dev,
 643                                        rtc_calib_remove_sysfs_group,
 644                                        &client->dev);
 645         if (err) {
 646                 dev_err(&client->dev,
 647                         "Failed to add sysfs cleanup action: %d\n",
 648                         err);
 649                 return err;
 650         }
 651
 652         err = rtc_register_device(rtc);
 653
 654         return err;
 655 }
 656
 657 static int abx80x_remove(struct i2c_client *client)
 658 {
 659         return 0;
 660 }
 661
 662 static const struct i2c_device_id abx80x_id[] = {
 663         { "abx80x", ABX80X },
 664         { "ab0801", AB0801 },
 665         { "ab0803", AB0803 },
 666         { "ab0804", AB0804 },
 667         { "ab0805", AB0805 },
 668         { "ab1801", AB1801 },
 669         { "ab1803", AB1803 },
 670         { "ab1804", AB1804 },
 671         { "ab1805", AB1805 },
 672         { "rv1805", AB1805 },
 673         { }
 674 };
 675 MODULE_DEVICE_TABLE(i2c, abx80x_id);
 676
 677 static struct i2c_driver abx80x_driver = {
 678         .driver         = {
 679                 .name   = "rtc-abx80x",
 680         },
 681         .probe          = abx80x_probe,
 682         .remove         = abx80x_remove,
 683         .id_table       = abx80x_id,
 684 };
 685
 686 module_i2c_driver(abx80x_driver);
 687
 688 MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
 689 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
 690 MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
 691 MODULE_LICENSE("GPL v2");