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