kernel/drivers/rtc/rtc-ds1343.c

   1 /* rtc-ds1343.c
   2  *
   3  * Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
   4  * Real Time Clock
   5  *
   6  * Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
   7  *          Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/device.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/regmap.h>
  21 #include <linux/rtc.h>
  22 #include <linux/bcd.h>
  23 #include <linux/pm.h>
  24 #include <linux/slab.h>
  25
  26 #define DS1343_DRV_VERSION      "01.00"
  27 #define DALLAS_MAXIM_DS1343     0
  28 #define DALLAS_MAXIM_DS1344     1
  29
  30 /* RTC DS1343 Registers */
  31 #define DS1343_SECONDS_REG      0x00
  32 #define DS1343_MINUTES_REG      0x01
  33 #define DS1343_HOURS_REG        0x02
  34 #define DS1343_DAY_REG          0x03
  35 #define DS1343_DATE_REG         0x04
  36 #define DS1343_MONTH_REG        0x05
  37 #define DS1343_YEAR_REG         0x06
  38 #define DS1343_ALM0_SEC_REG     0x07
  39 #define DS1343_ALM0_MIN_REG     0x08
  40 #define DS1343_ALM0_HOUR_REG    0x09
  41 #define DS1343_ALM0_DAY_REG     0x0A
  42 #define DS1343_ALM1_SEC_REG     0x0B
  43 #define DS1343_ALM1_MIN_REG     0x0C
  44 #define DS1343_ALM1_HOUR_REG    0x0D
  45 #define DS1343_ALM1_DAY_REG     0x0E
  46 #define DS1343_CONTROL_REG      0x0F
  47 #define DS1343_STATUS_REG       0x10
  48 #define DS1343_TRICKLE_REG      0x11
  49 #define DS1343_NVRAM            0x20
  50
  51 #define DS1343_NVRAM_LEN        96
  52
  53 /* DS1343 Control Registers bits */
  54 #define DS1343_EOSC             0x80
  55 #define DS1343_DOSF             0x20
  56 #define DS1343_EGFIL            0x10
  57 #define DS1343_SQW              0x08
  58 #define DS1343_INTCN            0x04
  59 #define DS1343_A1IE             0x02
  60 #define DS1343_A0IE             0x01
  61
  62 /* DS1343 Status Registers bits */
  63 #define DS1343_OSF              0x80
  64 #define DS1343_IRQF1            0x02
  65 #define DS1343_IRQF0            0x01
  66
  67 /* DS1343 Trickle Charger Registers bits */
  68 #define DS1343_TRICKLE_MAGIC    0xa0
  69 #define DS1343_TRICKLE_DS1      0x08
  70 #define DS1343_TRICKLE_1K       0x01
  71 #define DS1343_TRICKLE_2K       0x02
  72 #define DS1343_TRICKLE_4K       0x03
  73
  74 static const struct spi_device_id ds1343_id[] = {
  75         { "ds1343", DALLAS_MAXIM_DS1343 },
  76         { "ds1344", DALLAS_MAXIM_DS1344 },
  77         { }
  78 };
  79 MODULE_DEVICE_TABLE(spi, ds1343_id);
  80
  81 struct ds1343_priv {
  82         struct spi_device *spi;
  83         struct rtc_device *rtc;
  84         struct regmap *map;
  85         struct mutex mutex;
  86         unsigned int irqen;
  87         int irq;
  88         int alarm_sec;
  89         int alarm_min;
  90         int alarm_hour;
  91         int alarm_mday;
  92 };
  93
  94 static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
  95 {
  96         switch (cmd) {
  97 #ifdef RTC_SET_CHARGE
  98         case RTC_SET_CHARGE:
  99         {
 100                 int val;
 101
 102                 if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
 103                         return -EFAULT;
 104
 105                 return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
 106         }
 107         break;
 108 #endif
 109         }
 110
 111         return -ENOIOCTLCMD;
 112 }
 113
 114 static ssize_t ds1343_show_glitchfilter(struct device *dev,
 115                                 struct device_attribute *attr, char *buf)
 116 {
 117         struct ds1343_priv *priv = dev_get_drvdata(dev);
 118         int glitch_filt_status, data;
 119
 120         regmap_read(priv->map, DS1343_CONTROL_REG, &data);
 121
 122         glitch_filt_status = !!(data & DS1343_EGFIL);
 123
 124         if (glitch_filt_status)
 125                 return sprintf(buf, "enabled\n");
 126         else
 127                 return sprintf(buf, "disabled\n");
 128 }
 129
 130 static ssize_t ds1343_store_glitchfilter(struct device *dev,
 131                                         struct device_attribute *attr,
 132                                         const char *buf, size_t count)
 133 {
 134         struct ds1343_priv *priv = dev_get_drvdata(dev);
 135         int data;
 136
 137         regmap_read(priv->map, DS1343_CONTROL_REG, &data);
 138
 139         if (strncmp(buf, "enabled", 7) == 0)
 140                 data |= DS1343_EGFIL;
 141
 142         else if (strncmp(buf, "disabled", 8) == 0)
 143                 data &= ~(DS1343_EGFIL);
 144
 145         else
 146                 return -EINVAL;
 147
 148         regmap_write(priv->map, DS1343_CONTROL_REG, data);
 149
 150         return count;
 151 }
 152
 153 static DEVICE_ATTR(glitch_filter, S_IRUGO | S_IWUSR, ds1343_show_glitchfilter,
 154                         ds1343_store_glitchfilter);
 155
 156 static ssize_t ds1343_nvram_write(struct file *filp, struct kobject *kobj,
 157                         struct bin_attribute *attr,
 158                         char *buf, loff_t off, size_t count)
 159 {
 160         int ret;
 161         unsigned char address;
 162         struct device *dev = kobj_to_dev(kobj);
 163         struct ds1343_priv *priv = dev_get_drvdata(dev);
 164
 165         if (unlikely(!count))
 166                 return count;
 167
 168         if ((count + off) > DS1343_NVRAM_LEN)
 169                 count = DS1343_NVRAM_LEN - off;
 170
 171         address = DS1343_NVRAM + off;
 172
 173         ret = regmap_bulk_write(priv->map, address, buf, count);
 174         if (ret < 0)
 175                 dev_err(&priv->spi->dev, "Error in nvram write %d", ret);
 176
 177         return (ret < 0) ? ret : count;
 178 }
 179
 180
 181 static ssize_t ds1343_nvram_read(struct file *filp, struct kobject *kobj,
 182                                 struct bin_attribute *attr,
 183                                 char *buf, loff_t off, size_t count)
 184 {
 185         int ret;
 186         unsigned char address;
 187         struct device *dev = kobj_to_dev(kobj);
 188         struct ds1343_priv *priv = dev_get_drvdata(dev);
 189
 190         if (unlikely(!count))
 191                 return count;
 192
 193         if ((count + off) > DS1343_NVRAM_LEN)
 194                 count = DS1343_NVRAM_LEN - off;
 195
 196         address = DS1343_NVRAM + off;
 197
 198         ret = regmap_bulk_read(priv->map, address, buf, count);
 199         if (ret < 0)
 200                 dev_err(&priv->spi->dev, "Error in nvram read %d\n", ret);
 201
 202         return (ret < 0) ? ret : count;
 203 }
 204
 205
 206 static struct bin_attribute nvram_attr = {
 207         .attr.name      = "nvram",
 208         .attr.mode      = S_IRUGO | S_IWUSR,
 209         .read           = ds1343_nvram_read,
 210         .write          = ds1343_nvram_write,
 211         .size           = DS1343_NVRAM_LEN,
 212 };
 213
 214 static ssize_t ds1343_show_alarmstatus(struct device *dev,
 215                                 struct device_attribute *attr, char *buf)
 216 {
 217         struct ds1343_priv *priv = dev_get_drvdata(dev);
 218         int alarmstatus, data;
 219
 220         regmap_read(priv->map, DS1343_CONTROL_REG, &data);
 221
 222         alarmstatus = !!(data & DS1343_A0IE);
 223
 224         if (alarmstatus)
 225                 return sprintf(buf, "enabled\n");
 226         else
 227                 return sprintf(buf, "disabled\n");
 228 }
 229
 230 static DEVICE_ATTR(alarm_status, S_IRUGO, ds1343_show_alarmstatus, NULL);
 231
 232 static ssize_t ds1343_show_alarmmode(struct device *dev,
 233                                 struct device_attribute *attr, char *buf)
 234 {
 235         struct ds1343_priv *priv = dev_get_drvdata(dev);
 236         int alarm_mode, data;
 237         char *alarm_str;
 238
 239         regmap_read(priv->map, DS1343_ALM0_SEC_REG, &data);
 240         alarm_mode = (data & 0x80) >> 4;
 241
 242         regmap_read(priv->map, DS1343_ALM0_MIN_REG, &data);
 243         alarm_mode |= (data & 0x80) >> 5;
 244
 245         regmap_read(priv->map, DS1343_ALM0_HOUR_REG, &data);
 246         alarm_mode |= (data & 0x80) >> 6;
 247
 248         regmap_read(priv->map, DS1343_ALM0_DAY_REG, &data);
 249         alarm_mode |= (data & 0x80) >> 7;
 250
 251         switch (alarm_mode) {
 252         case 15:
 253                 alarm_str = "each second";
 254                 break;
 255
 256         case 7:
 257                 alarm_str = "seconds match";
 258                 break;
 259
 260         case 3:
 261                 alarm_str = "minutes and seconds match";
 262                 break;
 263
 264         case 1:
 265                 alarm_str = "hours, minutes and seconds match";
 266                 break;
 267
 268         case 0:
 269                 alarm_str = "day, hours, minutes and seconds match";
 270                 break;
 271
 272         default:
 273                 alarm_str = "invalid";
 274                 break;
 275         }
 276
 277         return sprintf(buf, "%s\n", alarm_str);
 278 }
 279
 280 static DEVICE_ATTR(alarm_mode, S_IRUGO, ds1343_show_alarmmode, NULL);
 281
 282 static ssize_t ds1343_show_tricklecharger(struct device *dev,
 283                                 struct device_attribute *attr, char *buf)
 284 {
 285         struct ds1343_priv *priv = dev_get_drvdata(dev);
 286         int data;
 287         char *diodes = "disabled", *resistors = " ";
 288
 289         regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
 290
 291         if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
 292                 switch (data & 0x0c) {
 293                 case DS1343_TRICKLE_DS1:
 294                         diodes = "one diode,";
 295                         break;
 296
 297                 default:
 298                         diodes = "no diode,";
 299                         break;
 300                 }
 301
 302                 switch (data & 0x03) {
 303                 case DS1343_TRICKLE_1K:
 304                         resistors = "1k Ohm";
 305                         break;
 306
 307                 case DS1343_TRICKLE_2K:
 308                         resistors = "2k Ohm";
 309                         break;
 310
 311                 case DS1343_TRICKLE_4K:
 312                         resistors = "4k Ohm";
 313                         break;
 314
 315                 default:
 316                         diodes = "disabled";
 317                         break;
 318                 }
 319         }
 320
 321         return sprintf(buf, "%s %s\n", diodes, resistors);
 322 }
 323
 324 static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
 325
 326 static int ds1343_sysfs_register(struct device *dev)
 327 {
 328         struct ds1343_priv *priv = dev_get_drvdata(dev);
 329         int err;
 330
 331         err = device_create_file(dev, &dev_attr_glitch_filter);
 332         if (err)
 333                 return err;
 334
 335         err = device_create_file(dev, &dev_attr_trickle_charger);
 336         if (err)
 337                 goto error1;
 338
 339         err = device_create_bin_file(dev, &nvram_attr);
 340         if (err)
 341                 goto error2;
 342
 343         if (priv->irq <= 0)
 344                 return err;
 345
 346         err = device_create_file(dev, &dev_attr_alarm_mode);
 347         if (err)
 348                 goto error3;
 349
 350         err = device_create_file(dev, &dev_attr_alarm_status);
 351         if (!err)
 352                 return err;
 353
 354         device_remove_file(dev, &dev_attr_alarm_mode);
 355
 356 error3:
 357         device_remove_bin_file(dev, &nvram_attr);
 358
 359 error2:
 360         device_remove_file(dev, &dev_attr_trickle_charger);
 361
 362 error1:
 363         device_remove_file(dev, &dev_attr_glitch_filter);
 364
 365         return err;
 366 }
 367
 368 static void ds1343_sysfs_unregister(struct device *dev)
 369 {
 370         struct ds1343_priv *priv = dev_get_drvdata(dev);
 371
 372         device_remove_file(dev, &dev_attr_glitch_filter);
 373         device_remove_file(dev, &dev_attr_trickle_charger);
 374         device_remove_bin_file(dev, &nvram_attr);
 375
 376         if (priv->irq <= 0)
 377                 return;
 378
 379         device_remove_file(dev, &dev_attr_alarm_status);
 380         device_remove_file(dev, &dev_attr_alarm_mode);
 381 }
 382
 383 static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
 384 {
 385         struct ds1343_priv *priv = dev_get_drvdata(dev);
 386         unsigned char buf[7];
 387         int res;
 388
 389         res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
 390         if (res)
 391                 return res;
 392
 393         dt->tm_sec      = bcd2bin(buf[0]);
 394         dt->tm_min      = bcd2bin(buf[1]);
 395         dt->tm_hour     = bcd2bin(buf[2] & 0x3F);
 396         dt->tm_wday     = bcd2bin(buf[3]) - 1;
 397         dt->tm_mday     = bcd2bin(buf[4]);
 398         dt->tm_mon      = bcd2bin(buf[5] & 0x1F) - 1;
 399         dt->tm_year     = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
 400
 401         return rtc_valid_tm(dt);
 402 }
 403
 404 static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
 405 {
 406         struct ds1343_priv *priv = dev_get_drvdata(dev);
 407         int res;
 408
 409         res = regmap_write(priv->map, DS1343_SECONDS_REG,
 410                                 bin2bcd(dt->tm_sec));
 411         if (res)
 412                 return res;
 413
 414         res = regmap_write(priv->map, DS1343_MINUTES_REG,
 415                                 bin2bcd(dt->tm_min));
 416         if (res)
 417                 return res;
 418
 419         res = regmap_write(priv->map, DS1343_HOURS_REG,
 420                                 bin2bcd(dt->tm_hour) & 0x3F);
 421         if (res)
 422                 return res;
 423
 424         res = regmap_write(priv->map, DS1343_DAY_REG,
 425                                 bin2bcd(dt->tm_wday + 1));
 426         if (res)
 427                 return res;
 428
 429         res = regmap_write(priv->map, DS1343_DATE_REG,
 430                                 bin2bcd(dt->tm_mday));
 431         if (res)
 432                 return res;
 433
 434         res = regmap_write(priv->map, DS1343_MONTH_REG,
 435                                 bin2bcd(dt->tm_mon + 1));
 436         if (res)
 437                 return res;
 438
 439         dt->tm_year %= 100;
 440
 441         res = regmap_write(priv->map, DS1343_YEAR_REG,
 442                                 bin2bcd(dt->tm_year));
 443         if (res)
 444                 return res;
 445
 446         return 0;
 447 }
 448
 449 static int ds1343_update_alarm(struct device *dev)
 450 {
 451         struct ds1343_priv *priv = dev_get_drvdata(dev);
 452         unsigned int control, stat;
 453         unsigned char buf[4];
 454         int res = 0;
 455
 456         res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
 457         if (res)
 458                 return res;
 459
 460         res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
 461         if (res)
 462                 return res;
 463
 464         control &= ~(DS1343_A0IE);
 465         stat &= ~(DS1343_IRQF0);
 466
 467         res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
 468         if (res)
 469                 return res;
 470
 471         res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
 472         if (res)
 473                 return res;
 474
 475         buf[0] = priv->alarm_sec < 0 || (priv->irqen & RTC_UF) ?
 476                 0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
 477         buf[1] = priv->alarm_min < 0 || (priv->irqen & RTC_UF) ?
 478                 0x80 : bin2bcd(priv->alarm_min) & 0x7F;
 479         buf[2] = priv->alarm_hour < 0 || (priv->irqen & RTC_UF) ?
 480                 0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
 481         buf[3] = priv->alarm_mday < 0 || (priv->irqen & RTC_UF) ?
 482                 0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
 483
 484         res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
 485         if (res)
 486                 return res;
 487
 488         if (priv->irqen) {
 489                 control |= DS1343_A0IE;
 490                 res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
 491         }
 492
 493         return res;
 494 }
 495
 496 static int ds1343_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 497 {
 498         struct ds1343_priv *priv = dev_get_drvdata(dev);
 499         int res = 0;
 500         unsigned int stat;
 501
 502         if (priv->irq <= 0)
 503                 return -EINVAL;
 504
 505         mutex_lock(&priv->mutex);
 506
 507         res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
 508         if (res)
 509                 goto out;
 510
 511         alarm->enabled = !!(priv->irqen & RTC_AF);
 512         alarm->pending = !!(stat & DS1343_IRQF0);
 513
 514         alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
 515         alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
 516         alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
 517         alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
 518
 519         alarm->time.tm_mon = -1;
 520         alarm->time.tm_year = -1;
 521         alarm->time.tm_wday = -1;
 522         alarm->time.tm_yday = -1;
 523         alarm->time.tm_isdst = -1;
 524
 525 out:
 526         mutex_unlock(&priv->mutex);
 527         return res;
 528 }
 529
 530 static int ds1343_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 531 {
 532         struct ds1343_priv *priv = dev_get_drvdata(dev);
 533         int res = 0;
 534
 535         if (priv->irq <= 0)
 536                 return -EINVAL;
 537
 538         mutex_lock(&priv->mutex);
 539
 540         priv->alarm_sec = alarm->time.tm_sec;
 541         priv->alarm_min = alarm->time.tm_min;
 542         priv->alarm_hour = alarm->time.tm_hour;
 543         priv->alarm_mday = alarm->time.tm_mday;
 544
 545         if (alarm->enabled)
 546                 priv->irqen |= RTC_AF;
 547
 548         res = ds1343_update_alarm(dev);
 549
 550         mutex_unlock(&priv->mutex);
 551
 552         return res;
 553 }
 554
 555 static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
 556 {
 557         struct ds1343_priv *priv = dev_get_drvdata(dev);
 558         int res = 0;
 559
 560         if (priv->irq <= 0)
 561                 return -EINVAL;
 562
 563         mutex_lock(&priv->mutex);
 564
 565         if (enabled)
 566                 priv->irqen |= RTC_AF;
 567         else
 568                 priv->irqen &= ~RTC_AF;
 569
 570         res = ds1343_update_alarm(dev);
 571
 572         mutex_unlock(&priv->mutex);
 573
 574         return res;
 575 }
 576
 577 static irqreturn_t ds1343_thread(int irq, void *dev_id)
 578 {
 579         struct ds1343_priv *priv = dev_id;
 580         unsigned int stat, control;
 581         int res = 0;
 582
 583         mutex_lock(&priv->mutex);
 584
 585         res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
 586         if (res)
 587                 goto out;
 588
 589         if (stat & DS1343_IRQF0) {
 590                 stat &= ~DS1343_IRQF0;
 591                 regmap_write(priv->map, DS1343_STATUS_REG, stat);
 592
 593                 res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
 594                 if (res)
 595                         goto out;
 596
 597                 control &= ~DS1343_A0IE;
 598                 regmap_write(priv->map, DS1343_CONTROL_REG, control);
 599
 600                 rtc_update_irq(priv->rtc, 1, RTC_AF | RTC_IRQF);
 601         }
 602
 603 out:
 604         mutex_unlock(&priv->mutex);
 605         return IRQ_HANDLED;
 606 }
 607
 608 static const struct rtc_class_ops ds1343_rtc_ops = {
 609         .ioctl          = ds1343_ioctl,
 610         .read_time      = ds1343_read_time,
 611         .set_time       = ds1343_set_time,
 612         .read_alarm     = ds1343_read_alarm,
 613         .set_alarm      = ds1343_set_alarm,
 614         .alarm_irq_enable = ds1343_alarm_irq_enable,
 615 };
 616
 617 static int ds1343_probe(struct spi_device *spi)
 618 {
 619         struct ds1343_priv *priv;
 620         struct regmap_config config;
 621         unsigned int data;
 622         int res;
 623
 624         memset(&config, 0, sizeof(config));
 625         config.reg_bits = 8;
 626         config.val_bits = 8;
 627         config.write_flag_mask = 0x80;
 628
 629         priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
 630         if (!priv)
 631                 return -ENOMEM;
 632
 633         priv->spi = spi;
 634         mutex_init(&priv->mutex);
 635
 636         /* RTC DS1347 works in spi mode 3 and
 637          * its chip select is active high
 638          */
 639         spi->mode = SPI_MODE_3 | SPI_CS_HIGH;
 640         spi->bits_per_word = 8;
 641         res = spi_setup(spi);
 642         if (res)
 643                 return res;
 644
 645         spi_set_drvdata(spi, priv);
 646
 647         priv->map = devm_regmap_init_spi(spi, &config);
 648
 649         if (IS_ERR(priv->map)) {
 650                 dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
 651                 return PTR_ERR(priv->map);
 652         }
 653
 654         res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
 655         if (res)
 656                 return res;
 657
 658         regmap_read(priv->map, DS1343_CONTROL_REG, &data);
 659         data |= DS1343_INTCN;
 660         data &= ~(DS1343_EOSC | DS1343_A1IE | DS1343_A0IE);
 661         regmap_write(priv->map, DS1343_CONTROL_REG, data);
 662
 663         regmap_read(priv->map, DS1343_STATUS_REG, &data);
 664         data &= ~(DS1343_OSF | DS1343_IRQF1 | DS1343_IRQF0);
 665         regmap_write(priv->map, DS1343_STATUS_REG, data);
 666
 667         priv->rtc = devm_rtc_device_register(&spi->dev, "ds1343",
 668                                         &ds1343_rtc_ops, THIS_MODULE);
 669         if (IS_ERR(priv->rtc)) {
 670                 dev_err(&spi->dev, "unable to register rtc ds1343\n");
 671                 return PTR_ERR(priv->rtc);
 672         }
 673
 674         priv->irq = spi->irq;
 675
 676         if (priv->irq >= 0) {
 677                 res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
 678                                                 ds1343_thread,
 679                                                 IRQF_NO_SUSPEND | IRQF_ONESHOT,
 680                                                 "ds1343", priv);
 681                 if (res) {
 682                         priv->irq = -1;
 683                         dev_err(&spi->dev,
 684                                 "unable to request irq for rtc ds1343\n");
 685                 } else {
 686                         device_set_wakeup_capable(&spi->dev, 1);
 687                 }
 688         }
 689
 690         res = ds1343_sysfs_register(&spi->dev);
 691         if (res)
 692                 dev_err(&spi->dev,
 693                         "unable to create sysfs entries for rtc ds1343\n");
 694
 695         return 0;
 696 }
 697
 698 static int ds1343_remove(struct spi_device *spi)
 699 {
 700         struct ds1343_priv *priv = spi_get_drvdata(spi);
 701
 702         if (spi->irq) {
 703                 mutex_lock(&priv->mutex);
 704                 priv->irqen &= ~RTC_AF;
 705                 mutex_unlock(&priv->mutex);
 706
 707                 devm_free_irq(&spi->dev, spi->irq, priv);
 708         }
 709
 710         spi_set_drvdata(spi, NULL);
 711
 712         ds1343_sysfs_unregister(&spi->dev);
 713
 714         return 0;
 715 }
 716
 717 #ifdef CONFIG_PM_SLEEP
 718
 719 static int ds1343_suspend(struct device *dev)
 720 {
 721         struct spi_device *spi = to_spi_device(dev);
 722
 723         if (spi->irq >= 0 && device_may_wakeup(dev))
 724                 enable_irq_wake(spi->irq);
 725
 726         return 0;
 727 }
 728
 729 static int ds1343_resume(struct device *dev)
 730 {
 731         struct spi_device *spi = to_spi_device(dev);
 732
 733         if (spi->irq >= 0 && device_may_wakeup(dev))
 734                 disable_irq_wake(spi->irq);
 735
 736         return 0;
 737 }
 738
 739 #endif
 740
 741 static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
 742
 743 static struct spi_driver ds1343_driver = {
 744         .driver = {
 745                 .name = "ds1343",
 746                 .owner = THIS_MODULE,
 747                 .pm = &ds1343_pm,
 748         },
 749         .probe = ds1343_probe,
 750         .remove = ds1343_remove,
 751         .id_table = ds1343_id,
 752 };
 753
 754 module_spi_driver(ds1343_driver);
 755
 756 MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
 757 MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
 758                 "Ankur Srivastava <sankurece@gmail.com>");
 759 MODULE_LICENSE("GPL v2");
 760 MODULE_VERSION(DS1343_DRV_VERSION);