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