drivers/rtc/rtc-x1205.c

   1 /*
   2  * An i2c driver for the Xicor/Intersil X1205 RTC
   3  * Copyright 2004 Karen Spearel
   4  * Copyright 2005 Alessandro Zummo
   5  *
   6  * please send all reports to:
   7  *      Karen Spearel <kas111 at gmail dot com>
   8  *      Alessandro Zummo <a.zummo@towertech.it>
   9  *
  10  * based on a lot of other RTC drivers.
  11  *
  12  * Information and datasheet:
  13  * http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License version 2 as
  17  * published by the Free Software Foundation.
  18  */
  19
  20 #include <linux/i2c.h>
  21 #include <linux/bcd.h>
  22 #include <linux/rtc.h>
  23 #include <linux/delay.h>
  24
  25 #define DRV_VERSION "1.0.8"
  26
  27 /* offsets into CCR area */
  28
  29 #define CCR_SEC                 0
  30 #define CCR_MIN                 1
  31 #define CCR_HOUR                2
  32 #define CCR_MDAY                3
  33 #define CCR_MONTH               4
  34 #define CCR_YEAR                5
  35 #define CCR_WDAY                6
  36 #define CCR_Y2K                 7
  37
  38 #define X1205_REG_SR            0x3F    /* status register */
  39 #define X1205_REG_Y2K           0x37
  40 #define X1205_REG_DW            0x36
  41 #define X1205_REG_YR            0x35
  42 #define X1205_REG_MO            0x34
  43 #define X1205_REG_DT            0x33
  44 #define X1205_REG_HR            0x32
  45 #define X1205_REG_MN            0x31
  46 #define X1205_REG_SC            0x30
  47 #define X1205_REG_DTR           0x13
  48 #define X1205_REG_ATR           0x12
  49 #define X1205_REG_INT           0x11
  50 #define X1205_REG_0             0x10
  51 #define X1205_REG_Y2K1          0x0F
  52 #define X1205_REG_DWA1          0x0E
  53 #define X1205_REG_YRA1          0x0D
  54 #define X1205_REG_MOA1          0x0C
  55 #define X1205_REG_DTA1          0x0B
  56 #define X1205_REG_HRA1          0x0A
  57 #define X1205_REG_MNA1          0x09
  58 #define X1205_REG_SCA1          0x08
  59 #define X1205_REG_Y2K0          0x07
  60 #define X1205_REG_DWA0          0x06
  61 #define X1205_REG_YRA0          0x05
  62 #define X1205_REG_MOA0          0x04
  63 #define X1205_REG_DTA0          0x03
  64 #define X1205_REG_HRA0          0x02
  65 #define X1205_REG_MNA0          0x01
  66 #define X1205_REG_SCA0          0x00
  67
  68 #define X1205_CCR_BASE          0x30    /* Base address of CCR */
  69 #define X1205_ALM0_BASE         0x00    /* Base address of ALARM0 */
  70
  71 #define X1205_SR_RTCF           0x01    /* Clock failure */
  72 #define X1205_SR_WEL            0x02    /* Write Enable Latch */
  73 #define X1205_SR_RWEL           0x04    /* Register Write Enable */
  74 #define X1205_SR_AL0            0x20    /* Alarm 0 match */
  75
  76 #define X1205_DTR_DTR0          0x01
  77 #define X1205_DTR_DTR1          0x02
  78 #define X1205_DTR_DTR2          0x04
  79
  80 #define X1205_HR_MIL            0x80    /* Set in ccr.hour for 24 hr mode */
  81
  82 #define X1205_INT_AL0E          0x20    /* Alarm 0 enable */
  83
  84 static struct i2c_driver x1205_driver;
  85
  86 /*
  87  * In the routines that deal directly with the x1205 hardware, we use
  88  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
  89  * Epoch is initialized as 2000. Time is set to UTC.
  90  */
  91 static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
  92                                 unsigned char reg_base)
  93 {
  94         unsigned char dt_addr[2] = { 0, reg_base };
  95         unsigned char buf[8];
  96         int i;
  97
  98         struct i2c_msg msgs[] = {
  99                 { client->addr, 0, 2, dt_addr },        /* setup read ptr */
 100                 { client->addr, I2C_M_RD, 8, buf },     /* read date */
 101         };
 102
 103         /* read date registers */
 104         if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 105                 dev_err(&client->dev, "%s: read error\n", __func__);
 106                 return -EIO;
 107         }
 108
 109         dev_dbg(&client->dev,
 110                 "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
 111                 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
 112                 __func__,
 113                 buf[0], buf[1], buf[2], buf[3],
 114                 buf[4], buf[5], buf[6], buf[7]);
 115
 116         /* Mask out the enable bits if these are alarm registers */
 117         if (reg_base < X1205_CCR_BASE)
 118                 for (i = 0; i <= 4; i++)
 119                         buf[i] &= 0x7F;
 120
 121         tm->tm_sec = bcd2bin(buf[CCR_SEC]);
 122         tm->tm_min = bcd2bin(buf[CCR_MIN]);
 123         tm->tm_hour = bcd2bin(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
 124         tm->tm_mday = bcd2bin(buf[CCR_MDAY]);
 125         tm->tm_mon = bcd2bin(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
 126         tm->tm_year = bcd2bin(buf[CCR_YEAR])
 127                         + (bcd2bin(buf[CCR_Y2K]) * 100) - 1900;
 128         tm->tm_wday = buf[CCR_WDAY];
 129
 130         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 131                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 132                 __func__,
 133                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 134                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 135
 136         return 0;
 137 }
 138
 139 static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
 140 {
 141         static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
 142
 143         struct i2c_msg msgs[] = {
 144                 { client->addr, 0, 2, sr_addr },        /* setup read ptr */
 145                 { client->addr, I2C_M_RD, 1, sr },      /* read status */
 146         };
 147
 148         /* read status register */
 149         if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 150                 dev_err(&client->dev, "%s: read error\n", __func__);
 151                 return -EIO;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
 158                         u8 reg_base, unsigned char alm_enable)
 159 {
 160         int i, xfer;
 161         unsigned char rdata[10] = { 0, reg_base };
 162         unsigned char *buf = rdata + 2;
 163
 164         static const unsigned char wel[3] = { 0, X1205_REG_SR,
 165                                                 X1205_SR_WEL };
 166
 167         static const unsigned char rwel[3] = { 0, X1205_REG_SR,
 168                                                 X1205_SR_WEL | X1205_SR_RWEL };
 169
 170         static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
 171
 172         dev_dbg(&client->dev,
 173                 "%s: sec=%d min=%d hour=%d mday=%d mon=%d year=%d wday=%d\n",
 174                 __func__, tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday,
 175                 tm->tm_mon, tm->tm_year, tm->tm_wday);
 176
 177         buf[CCR_SEC] = bin2bcd(tm->tm_sec);
 178         buf[CCR_MIN] = bin2bcd(tm->tm_min);
 179
 180         /* set hour and 24hr bit */
 181         buf[CCR_HOUR] = bin2bcd(tm->tm_hour) | X1205_HR_MIL;
 182
 183         buf[CCR_MDAY] = bin2bcd(tm->tm_mday);
 184
 185         /* month, 1 - 12 */
 186         buf[CCR_MONTH] = bin2bcd(tm->tm_mon + 1);
 187
 188         /* year, since the rtc epoch*/
 189         buf[CCR_YEAR] = bin2bcd(tm->tm_year % 100);
 190         buf[CCR_WDAY] = tm->tm_wday & 0x07;
 191         buf[CCR_Y2K] = bin2bcd((tm->tm_year + 1900) / 100);
 192
 193         /* If writing alarm registers, set compare bits on registers 0-4 */
 194         if (reg_base < X1205_CCR_BASE)
 195                 for (i = 0; i <= 4; i++)
 196                         buf[i] |= 0x80;
 197
 198         /* this sequence is required to unlock the chip */
 199         if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
 200                 dev_err(&client->dev, "%s: wel - %d\n", __func__, xfer);
 201                 return -EIO;
 202         }
 203
 204         if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
 205                 dev_err(&client->dev, "%s: rwel - %d\n", __func__, xfer);
 206                 return -EIO;
 207         }
 208
 209         xfer = i2c_master_send(client, rdata, sizeof(rdata));
 210         if (xfer != sizeof(rdata)) {
 211                 dev_err(&client->dev,
 212                         "%s: result=%d addr=%02x, data=%02x\n",
 213                         __func__,
 214                          xfer, rdata[1], rdata[2]);
 215                 return -EIO;
 216         }
 217
 218         /* If we wrote to the nonvolatile region, wait 10msec for write cycle*/
 219         if (reg_base < X1205_CCR_BASE) {
 220                 unsigned char al0e[3] = { 0, X1205_REG_INT, 0 };
 221
 222                 msleep(10);
 223
 224                 /* ...and set or clear the AL0E bit in the INT register */
 225
 226                 /* Need to set RWEL again as the write has cleared it */
 227                 xfer = i2c_master_send(client, rwel, 3);
 228                 if (xfer != 3) {
 229                         dev_err(&client->dev,
 230                                 "%s: aloe rwel - %d\n",
 231                                 __func__,
 232                                 xfer);
 233                         return -EIO;
 234                 }
 235
 236                 if (alm_enable)
 237                         al0e[2] = X1205_INT_AL0E;
 238
 239                 xfer = i2c_master_send(client, al0e, 3);
 240                 if (xfer != 3) {
 241                         dev_err(&client->dev,
 242                                 "%s: al0e - %d\n",
 243                                 __func__,
 244                                 xfer);
 245                         return -EIO;
 246                 }
 247
 248                 /* and wait 10msec again for this write to complete */
 249                 msleep(10);
 250         }
 251
 252         /* disable further writes */
 253         if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
 254                 dev_err(&client->dev, "%s: diswe - %d\n", __func__, xfer);
 255                 return -EIO;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int x1205_fix_osc(struct i2c_client *client)
 262 {
 263         int err;
 264         struct rtc_time tm;
 265
 266         memset(&tm, 0, sizeof(tm));
 267
 268         err = x1205_set_datetime(client, &tm, X1205_CCR_BASE, 0);
 269         if (err < 0)
 270                 dev_err(&client->dev, "unable to restart the oscillator\n");
 271
 272         return err;
 273 }
 274
 275 static int x1205_get_dtrim(struct i2c_client *client, int *trim)
 276 {
 277         unsigned char dtr;
 278         static unsigned char dtr_addr[2] = { 0, X1205_REG_DTR };
 279
 280         struct i2c_msg msgs[] = {
 281                 { client->addr, 0, 2, dtr_addr },       /* setup read ptr */
 282                 { client->addr, I2C_M_RD, 1, &dtr },    /* read dtr */
 283         };
 284
 285         /* read dtr register */
 286         if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 287                 dev_err(&client->dev, "%s: read error\n", __func__);
 288                 return -EIO;
 289         }
 290
 291         dev_dbg(&client->dev, "%s: raw dtr=%x\n", __func__, dtr);
 292
 293         *trim = 0;
 294
 295         if (dtr & X1205_DTR_DTR0)
 296                 *trim += 20;
 297
 298         if (dtr & X1205_DTR_DTR1)
 299                 *trim += 10;
 300
 301         if (dtr & X1205_DTR_DTR2)
 302                 *trim = -*trim;
 303
 304         return 0;
 305 }
 306
 307 static int x1205_get_atrim(struct i2c_client *client, int *trim)
 308 {
 309         s8 atr;
 310         static unsigned char atr_addr[2] = { 0, X1205_REG_ATR };
 311
 312         struct i2c_msg msgs[] = {
 313                 { client->addr, 0, 2, atr_addr },       /* setup read ptr */
 314                 { client->addr, I2C_M_RD, 1, &atr },    /* read atr */
 315         };
 316
 317         /* read atr register */
 318         if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 319                 dev_err(&client->dev, "%s: read error\n", __func__);
 320                 return -EIO;
 321         }
 322
 323         dev_dbg(&client->dev, "%s: raw atr=%x\n", __func__, atr);
 324
 325         /* atr is a two's complement value on 6 bits,
 326          * perform sign extension. The formula is
 327          * Catr = (atr * 0.25pF) + 11.00pF.
 328          */
 329         if (atr & 0x20)
 330                 atr |= 0xC0;
 331
 332         dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __func__, atr, atr);
 333
 334         *trim = (atr * 250) + 11000;
 335
 336         dev_dbg(&client->dev, "%s: real=%d\n", __func__, *trim);
 337
 338         return 0;
 339 }
 340
 341 struct x1205_limit
 342 {
 343         unsigned char reg, mask, min, max;
 344 };
 345
 346 static int x1205_validate_client(struct i2c_client *client)
 347 {
 348         int i, xfer;
 349
 350         /* Probe array. We will read the register at the specified
 351          * address and check if the given bits are zero.
 352          */
 353         static const unsigned char probe_zero_pattern[] = {
 354                 /* register, mask */
 355                 X1205_REG_SR,   0x18,
 356                 X1205_REG_DTR,  0xF8,
 357                 X1205_REG_ATR,  0xC0,
 358                 X1205_REG_INT,  0x18,
 359                 X1205_REG_0,    0xFF,
 360         };
 361
 362         static const struct x1205_limit probe_limits_pattern[] = {
 363                 /* register, mask, min, max */
 364                 { X1205_REG_Y2K,        0xFF,   19,     20      },
 365                 { X1205_REG_DW,         0xFF,   0,      6       },
 366                 { X1205_REG_YR,         0xFF,   0,      99      },
 367                 { X1205_REG_MO,         0xFF,   0,      12      },
 368                 { X1205_REG_DT,         0xFF,   0,      31      },
 369                 { X1205_REG_HR,         0x7F,   0,      23      },
 370                 { X1205_REG_MN,         0xFF,   0,      59      },
 371                 { X1205_REG_SC,         0xFF,   0,      59      },
 372                 { X1205_REG_Y2K1,       0xFF,   19,     20      },
 373                 { X1205_REG_Y2K0,       0xFF,   19,     20      },
 374         };
 375
 376         /* check that registers have bits a 0 where expected */
 377         for (i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) {
 378                 unsigned char buf;
 379
 380                 unsigned char addr[2] = { 0, probe_zero_pattern[i] };
 381
 382                 struct i2c_msg msgs[2] = {
 383                         { client->addr, 0, 2, addr },
 384                         { client->addr, I2C_M_RD, 1, &buf },
 385                 };
 386
 387                 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
 388                         dev_err(&client->dev,
 389                                 "%s: could not read register %x\n",
 390                                 __func__, probe_zero_pattern[i]);
 391
 392                         return -EIO;
 393                 }
 394
 395                 if ((buf & probe_zero_pattern[i+1]) != 0) {
 396                         dev_err(&client->dev,
 397                                 "%s: register=%02x, zero pattern=%d, value=%x\n",
 398                                 __func__, probe_zero_pattern[i], i, buf);
 399
 400                         return -ENODEV;
 401                 }
 402         }
 403
 404         /* check limits (only registers with bcd values) */
 405         for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
 406                 unsigned char reg, value;
 407
 408                 unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
 409
 410                 struct i2c_msg msgs[2] = {
 411                         { client->addr, 0, 2, addr },
 412                         { client->addr, I2C_M_RD, 1, &reg },
 413                 };
 414
 415                 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
 416                         dev_err(&client->dev,
 417                                 "%s: could not read register %x\n",
 418                                 __func__, probe_limits_pattern[i].reg);
 419
 420                         return -EIO;
 421                 }
 422
 423                 value = bcd2bin(reg & probe_limits_pattern[i].mask);
 424
 425                 if (value > probe_limits_pattern[i].max ||
 426                         value < probe_limits_pattern[i].min) {
 427                         dev_dbg(&client->dev,
 428                                 "%s: register=%x, lim pattern=%d, value=%d\n",
 429                                 __func__, probe_limits_pattern[i].reg,
 430                                 i, value);
 431
 432                         return -ENODEV;
 433                 }
 434         }
 435
 436         return 0;
 437 }
 438
 439 static int x1205_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 440 {
 441         int err;
 442         unsigned char intreg, status;
 443         static unsigned char int_addr[2] = { 0, X1205_REG_INT };
 444         struct i2c_client *client = to_i2c_client(dev);
 445         struct i2c_msg msgs[] = {
 446                 { client->addr, 0, 2, int_addr },        /* setup read ptr */
 447                 { client->addr, I2C_M_RD, 1, &intreg },  /* read INT register */
 448         };
 449
 450         /* read interrupt register and status register */
 451         if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 452                 dev_err(&client->dev, "%s: read error\n", __func__);
 453                 return -EIO;
 454         }
 455         err = x1205_get_status(client, &status);
 456         if (err == 0) {
 457                 alrm->pending = (status & X1205_SR_AL0) ? 1 : 0;
 458                 alrm->enabled = (intreg & X1205_INT_AL0E) ? 1 : 0;
 459                 err = x1205_get_datetime(client, &alrm->time, X1205_ALM0_BASE);
 460         }
 461         return err;
 462 }
 463
 464 static int x1205_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 465 {
 466         return x1205_set_datetime(to_i2c_client(dev),
 467                 &alrm->time, X1205_ALM0_BASE, alrm->enabled);
 468 }
 469
 470 static int x1205_rtc_read_time(struct device *dev, struct rtc_time *tm)
 471 {
 472         return x1205_get_datetime(to_i2c_client(dev),
 473                 tm, X1205_CCR_BASE);
 474 }
 475
 476 static int x1205_rtc_set_time(struct device *dev, struct rtc_time *tm)
 477 {
 478         return x1205_set_datetime(to_i2c_client(dev),
 479                 tm, X1205_CCR_BASE, 0);
 480 }
 481
 482 static int x1205_rtc_proc(struct device *dev, struct seq_file *seq)
 483 {
 484         int err, dtrim, atrim;
 485
 486         if ((err = x1205_get_dtrim(to_i2c_client(dev), &dtrim)) == 0)
 487                 seq_printf(seq, "digital_trim\t: %d ppm\n", dtrim);
 488
 489         if ((err = x1205_get_atrim(to_i2c_client(dev), &atrim)) == 0)
 490                 seq_printf(seq, "analog_trim\t: %d.%02d pF\n",
 491                         atrim / 1000, atrim % 1000);
 492         return 0;
 493 }
 494
 495 static const struct rtc_class_ops x1205_rtc_ops = {
 496         .proc           = x1205_rtc_proc,
 497         .read_time      = x1205_rtc_read_time,
 498         .set_time       = x1205_rtc_set_time,
 499         .read_alarm     = x1205_rtc_read_alarm,
 500         .set_alarm      = x1205_rtc_set_alarm,
 501 };
 502
 503 static ssize_t x1205_sysfs_show_atrim(struct device *dev,
 504                                 struct device_attribute *attr, char *buf)
 505 {
 506         int err, atrim;
 507
 508         err = x1205_get_atrim(to_i2c_client(dev), &atrim);
 509         if (err)
 510                 return err;
 511
 512         return sprintf(buf, "%d.%02d pF\n", atrim / 1000, atrim % 1000);
 513 }
 514 static DEVICE_ATTR(atrim, S_IRUGO, x1205_sysfs_show_atrim, NULL);
 515
 516 static ssize_t x1205_sysfs_show_dtrim(struct device *dev,
 517                                 struct device_attribute *attr, char *buf)
 518 {
 519         int err, dtrim;
 520
 521         err = x1205_get_dtrim(to_i2c_client(dev), &dtrim);
 522         if (err)
 523                 return err;
 524
 525         return sprintf(buf, "%d ppm\n", dtrim);
 526 }
 527 static DEVICE_ATTR(dtrim, S_IRUGO, x1205_sysfs_show_dtrim, NULL);
 528
 529 static int x1205_sysfs_register(struct device *dev)
 530 {
 531         int err;
 532
 533         err = device_create_file(dev, &dev_attr_atrim);
 534         if (err)
 535                 return err;
 536
 537         err = device_create_file(dev, &dev_attr_dtrim);
 538         if (err)
 539                 device_remove_file(dev, &dev_attr_atrim);
 540
 541         return err;
 542 }
 543
 544 static void x1205_sysfs_unregister(struct device *dev)
 545 {
 546         device_remove_file(dev, &dev_attr_atrim);
 547         device_remove_file(dev, &dev_attr_dtrim);
 548 }
 549
 550
 551 static int x1205_probe(struct i2c_client *client,
 552                         const struct i2c_device_id *id)
 553 {
 554         int err = 0;
 555         unsigned char sr;
 556         struct rtc_device *rtc;
 557
 558         dev_dbg(&client->dev, "%s\n", __func__);
 559
 560         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 561                 return -ENODEV;
 562
 563         if (x1205_validate_client(client) < 0)
 564                 return -ENODEV;
 565
 566         dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
 567
 568         rtc = rtc_device_register(x1205_driver.driver.name, &client->dev,
 569                                 &x1205_rtc_ops, THIS_MODULE);
 570
 571         if (IS_ERR(rtc))
 572                 return PTR_ERR(rtc);
 573
 574         i2c_set_clientdata(client, rtc);
 575
 576         /* Check for power failures and eventualy enable the osc */
 577         if ((err = x1205_get_status(client, &sr)) == 0) {
 578                 if (sr & X1205_SR_RTCF) {
 579                         dev_err(&client->dev,
 580                                 "power failure detected, "
 581                                 "please set the clock\n");
 582                         udelay(50);
 583                         x1205_fix_osc(client);
 584                 }
 585         }
 586         else
 587                 dev_err(&client->dev, "couldn't read status\n");
 588
 589         err = x1205_sysfs_register(&client->dev);
 590         if (err)
 591                 goto exit_devreg;
 592
 593         return 0;
 594
 595 exit_devreg:
 596         rtc_device_unregister(rtc);
 597
 598         return err;
 599 }
 600
 601 static int x1205_remove(struct i2c_client *client)
 602 {
 603         struct rtc_device *rtc = i2c_get_clientdata(client);
 604
 605         rtc_device_unregister(rtc);
 606         x1205_sysfs_unregister(&client->dev);
 607         return 0;
 608 }
 609
 610 static const struct i2c_device_id x1205_id[] = {
 611         { "x1205", 0 },
 612         { }
 613 };
 614 MODULE_DEVICE_TABLE(i2c, x1205_id);
 615
 616 static struct i2c_driver x1205_driver = {
 617         .driver         = {
 618                 .name   = "rtc-x1205",
 619         },
 620         .probe          = x1205_probe,
 621         .remove         = x1205_remove,
 622         .id_table       = x1205_id,
 623 };
 624
 625 static int __init x1205_init(void)
 626 {
 627         return i2c_add_driver(&x1205_driver);
 628 }
 629
 630 static void __exit x1205_exit(void)
 631 {
 632         i2c_del_driver(&x1205_driver);
 633 }
 634
 635 MODULE_AUTHOR(
 636         "Karen Spearel <kas111 at gmail dot com>, "
 637         "Alessandro Zummo <a.zummo@towertech.it>");
 638 MODULE_DESCRIPTION("Xicor/Intersil X1205 RTC driver");
 639 MODULE_LICENSE("GPL");
 640 MODULE_VERSION(DRV_VERSION);
 641
 642 module_init(x1205_init);
 643 module_exit(x1205_exit);