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