linux/drivers/rtc/rtc-x1205.c
<<
>>
Prefs
   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
  85static 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 */
  92static 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                {/* setup read ptr */
 101                        .addr = client->addr,
 102                        .len = 2,
 103                        .buf = dt_addr
 104                },
 105                {/* read date */
 106                        .addr = client->addr,
 107                        .flags = I2C_M_RD,
 108                        .len = 8,
 109                        .buf = buf
 110                },
 111        };
 112
 113        /* read date registers */
 114        if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 115                dev_err(&client->dev, "%s: read error\n", __func__);
 116                return -EIO;
 117        }
 118
 119        dev_dbg(&client->dev,
 120                "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
 121                "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
 122                __func__,
 123                buf[0], buf[1], buf[2], buf[3],
 124                buf[4], buf[5], buf[6], buf[7]);
 125
 126        /* Mask out the enable bits if these are alarm registers */
 127        if (reg_base < X1205_CCR_BASE)
 128                for (i = 0; i <= 4; i++)
 129                        buf[i] &= 0x7F;
 130
 131        tm->tm_sec = bcd2bin(buf[CCR_SEC]);
 132        tm->tm_min = bcd2bin(buf[CCR_MIN]);
 133        tm->tm_hour = bcd2bin(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
 134        tm->tm_mday = bcd2bin(buf[CCR_MDAY]);
 135        tm->tm_mon = bcd2bin(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
 136        tm->tm_year = bcd2bin(buf[CCR_YEAR])
 137                        + (bcd2bin(buf[CCR_Y2K]) * 100) - 1900;
 138        tm->tm_wday = buf[CCR_WDAY];
 139
 140        dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 141                "mday=%d, mon=%d, year=%d, wday=%d\n",
 142                __func__,
 143                tm->tm_sec, tm->tm_min, tm->tm_hour,
 144                tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 145
 146        return 0;
 147}
 148
 149static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
 150{
 151        static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
 152
 153        struct i2c_msg msgs[] = {
 154                {     /* setup read ptr */
 155                        .addr = client->addr,
 156                        .len = 2,
 157                        .buf = sr_addr
 158                },
 159                {    /* read status */
 160                        .addr = client->addr,
 161                        .flags = I2C_M_RD,
 162                        .len = 1,
 163                        .buf = sr
 164                },
 165        };
 166
 167        /* read status register */
 168        if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 169                dev_err(&client->dev, "%s: read error\n", __func__);
 170                return -EIO;
 171        }
 172
 173        return 0;
 174}
 175
 176static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
 177                        u8 reg_base, unsigned char alm_enable)
 178{
 179        int i, xfer;
 180        unsigned char rdata[10] = { 0, reg_base };
 181        unsigned char *buf = rdata + 2;
 182
 183        static const unsigned char wel[3] = { 0, X1205_REG_SR,
 184                                                X1205_SR_WEL };
 185
 186        static const unsigned char rwel[3] = { 0, X1205_REG_SR,
 187                                                X1205_SR_WEL | X1205_SR_RWEL };
 188
 189        static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
 190
 191        dev_dbg(&client->dev,
 192                "%s: sec=%d min=%d hour=%d mday=%d mon=%d year=%d wday=%d\n",
 193                __func__, tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday,
 194                tm->tm_mon, tm->tm_year, tm->tm_wday);
 195
 196        buf[CCR_SEC] = bin2bcd(tm->tm_sec);
 197        buf[CCR_MIN] = bin2bcd(tm->tm_min);
 198
 199        /* set hour and 24hr bit */
 200        buf[CCR_HOUR] = bin2bcd(tm->tm_hour) | X1205_HR_MIL;
 201
 202        buf[CCR_MDAY] = bin2bcd(tm->tm_mday);
 203
 204        /* month, 1 - 12 */
 205        buf[CCR_MONTH] = bin2bcd(tm->tm_mon + 1);
 206
 207        /* year, since the rtc epoch*/
 208        buf[CCR_YEAR] = bin2bcd(tm->tm_year % 100);
 209        buf[CCR_WDAY] = tm->tm_wday & 0x07;
 210        buf[CCR_Y2K] = bin2bcd((tm->tm_year + 1900) / 100);
 211
 212        /* If writing alarm registers, set compare bits on registers 0-4 */
 213        if (reg_base < X1205_CCR_BASE)
 214                for (i = 0; i <= 4; i++)
 215                        buf[i] |= 0x80;
 216
 217        /* this sequence is required to unlock the chip */
 218        xfer = i2c_master_send(client, wel, 3);
 219        if (xfer != 3) {
 220                dev_err(&client->dev, "%s: wel - %d\n", __func__, xfer);
 221                return -EIO;
 222        }
 223
 224        xfer = i2c_master_send(client, rwel, 3);
 225        if (xfer != 3) {
 226                dev_err(&client->dev, "%s: rwel - %d\n", __func__, xfer);
 227                return -EIO;
 228        }
 229
 230        xfer = i2c_master_send(client, rdata, sizeof(rdata));
 231        if (xfer != sizeof(rdata)) {
 232                dev_err(&client->dev,
 233                        "%s: result=%d addr=%02x, data=%02x\n",
 234                        __func__,
 235                         xfer, rdata[1], rdata[2]);
 236                return -EIO;
 237        }
 238
 239        /* If we wrote to the nonvolatile region, wait 10msec for write cycle*/
 240        if (reg_base < X1205_CCR_BASE) {
 241                unsigned char al0e[3] = { 0, X1205_REG_INT, 0 };
 242
 243                msleep(10);
 244
 245                /* ...and set or clear the AL0E bit in the INT register */
 246
 247                /* Need to set RWEL again as the write has cleared it */
 248                xfer = i2c_master_send(client, rwel, 3);
 249                if (xfer != 3) {
 250                        dev_err(&client->dev,
 251                                "%s: aloe rwel - %d\n",
 252                                __func__,
 253                                xfer);
 254                        return -EIO;
 255                }
 256
 257                if (alm_enable)
 258                        al0e[2] = X1205_INT_AL0E;
 259
 260                xfer = i2c_master_send(client, al0e, 3);
 261                if (xfer != 3) {
 262                        dev_err(&client->dev,
 263                                "%s: al0e - %d\n",
 264                                __func__,
 265                                xfer);
 266                        return -EIO;
 267                }
 268
 269                /* and wait 10msec again for this write to complete */
 270                msleep(10);
 271        }
 272
 273        /* disable further writes */
 274        xfer = i2c_master_send(client, diswe, 3);
 275        if (xfer != 3) {
 276                dev_err(&client->dev, "%s: diswe - %d\n", __func__, xfer);
 277                return -EIO;
 278        }
 279
 280        return 0;
 281}
 282
 283static int x1205_fix_osc(struct i2c_client *client)
 284{
 285        int err;
 286        struct rtc_time tm;
 287
 288        memset(&tm, 0, sizeof(tm));
 289
 290        err = x1205_set_datetime(client, &tm, X1205_CCR_BASE, 0);
 291        if (err < 0)
 292                dev_err(&client->dev, "unable to restart the oscillator\n");
 293
 294        return err;
 295}
 296
 297static int x1205_get_dtrim(struct i2c_client *client, int *trim)
 298{
 299        unsigned char dtr;
 300        static unsigned char dtr_addr[2] = { 0, X1205_REG_DTR };
 301
 302        struct i2c_msg msgs[] = {
 303                {       /* setup read ptr */
 304                        .addr = client->addr,
 305                        .len = 2,
 306                        .buf = dtr_addr
 307                },
 308                {      /* read dtr */
 309                        .addr = client->addr,
 310                        .flags = I2C_M_RD,
 311                        .len = 1,
 312                        .buf = &dtr
 313                },
 314        };
 315
 316        /* read dtr register */
 317        if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 318                dev_err(&client->dev, "%s: read error\n", __func__);
 319                return -EIO;
 320        }
 321
 322        dev_dbg(&client->dev, "%s: raw dtr=%x\n", __func__, dtr);
 323
 324        *trim = 0;
 325
 326        if (dtr & X1205_DTR_DTR0)
 327                *trim += 20;
 328
 329        if (dtr & X1205_DTR_DTR1)
 330                *trim += 10;
 331
 332        if (dtr & X1205_DTR_DTR2)
 333                *trim = -*trim;
 334
 335        return 0;
 336}
 337
 338static int x1205_get_atrim(struct i2c_client *client, int *trim)
 339{
 340        s8 atr;
 341        static unsigned char atr_addr[2] = { 0, X1205_REG_ATR };
 342
 343        struct i2c_msg msgs[] = {
 344                {/* setup read ptr */
 345                        .addr = client->addr,
 346                        .len = 2,
 347                        .buf = atr_addr
 348                },
 349                {/* read atr */
 350                        .addr = client->addr,
 351                        .flags = I2C_M_RD,
 352                        .len = 1,
 353                        .buf = &atr
 354                },
 355        };
 356
 357        /* read atr register */
 358        if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 359                dev_err(&client->dev, "%s: read error\n", __func__);
 360                return -EIO;
 361        }
 362
 363        dev_dbg(&client->dev, "%s: raw atr=%x\n", __func__, atr);
 364
 365        /* atr is a two's complement value on 6 bits,
 366         * perform sign extension. The formula is
 367         * Catr = (atr * 0.25pF) + 11.00pF.
 368         */
 369        if (atr & 0x20)
 370                atr |= 0xC0;
 371
 372        dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __func__, atr, atr);
 373
 374        *trim = (atr * 250) + 11000;
 375
 376        dev_dbg(&client->dev, "%s: real=%d\n", __func__, *trim);
 377
 378        return 0;
 379}
 380
 381struct x1205_limit {
 382        unsigned char reg, mask, min, max;
 383};
 384
 385static int x1205_validate_client(struct i2c_client *client)
 386{
 387        int i, xfer;
 388
 389        /* Probe array. We will read the register at the specified
 390         * address and check if the given bits are zero.
 391         */
 392        static const unsigned char probe_zero_pattern[] = {
 393                /* register, mask */
 394                X1205_REG_SR,   0x18,
 395                X1205_REG_DTR,  0xF8,
 396                X1205_REG_ATR,  0xC0,
 397                X1205_REG_INT,  0x18,
 398                X1205_REG_0,    0xFF,
 399        };
 400
 401        static const struct x1205_limit probe_limits_pattern[] = {
 402                /* register, mask, min, max */
 403                { X1205_REG_Y2K,        0xFF,   19,     20      },
 404                { X1205_REG_DW,         0xFF,   0,      6       },
 405                { X1205_REG_YR,         0xFF,   0,      99      },
 406                { X1205_REG_MO,         0xFF,   0,      12      },
 407                { X1205_REG_DT,         0xFF,   0,      31      },
 408                { X1205_REG_HR,         0x7F,   0,      23      },
 409                { X1205_REG_MN,         0xFF,   0,      59      },
 410                { X1205_REG_SC,         0xFF,   0,      59      },
 411                { X1205_REG_Y2K1,       0xFF,   19,     20      },
 412                { X1205_REG_Y2K0,       0xFF,   19,     20      },
 413        };
 414
 415        /* check that registers have bits a 0 where expected */
 416        for (i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) {
 417                unsigned char buf;
 418
 419                unsigned char addr[2] = { 0, probe_zero_pattern[i] };
 420
 421                struct i2c_msg msgs[2] = {
 422                        {
 423                                .addr = client->addr,
 424                                .len = 2,
 425                                .buf = addr
 426                        },
 427                        {
 428                                .addr = client->addr,
 429                                .flags = I2C_M_RD,
 430                                .len = 1,
 431                                .buf = &buf
 432                        },
 433                };
 434
 435                xfer = i2c_transfer(client->adapter, msgs, 2);
 436                if (xfer != 2) {
 437                        dev_err(&client->dev,
 438                                "%s: could not read register %x\n",
 439                                __func__, probe_zero_pattern[i]);
 440
 441                        return -EIO;
 442                }
 443
 444                if ((buf & probe_zero_pattern[i+1]) != 0) {
 445                        dev_err(&client->dev,
 446                                "%s: register=%02x, zero pattern=%d, value=%x\n",
 447                                __func__, probe_zero_pattern[i], i, buf);
 448
 449                        return -ENODEV;
 450                }
 451        }
 452
 453        /* check limits (only registers with bcd values) */
 454        for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
 455                unsigned char reg, value;
 456
 457                unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
 458
 459                struct i2c_msg msgs[2] = {
 460                        {
 461                                .addr = client->addr,
 462                                .len = 2,
 463                                .buf = addr
 464                        },
 465                        {
 466                                .addr = client->addr,
 467                                .flags = I2C_M_RD,
 468                                .len = 1,
 469                                .buf = &reg
 470                        },
 471                };
 472
 473                xfer = i2c_transfer(client->adapter, msgs, 2);
 474                if (xfer != 2) {
 475                        dev_err(&client->dev,
 476                                "%s: could not read register %x\n",
 477                                __func__, probe_limits_pattern[i].reg);
 478
 479                        return -EIO;
 480                }
 481
 482                value = bcd2bin(reg & probe_limits_pattern[i].mask);
 483
 484                if (value > probe_limits_pattern[i].max ||
 485                        value < probe_limits_pattern[i].min) {
 486                        dev_dbg(&client->dev,
 487                                "%s: register=%x, lim pattern=%d, value=%d\n",
 488                                __func__, probe_limits_pattern[i].reg,
 489                                i, value);
 490
 491                        return -ENODEV;
 492                }
 493        }
 494
 495        return 0;
 496}
 497
 498static int x1205_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 499{
 500        int err;
 501        unsigned char intreg, status;
 502        static unsigned char int_addr[2] = { 0, X1205_REG_INT };
 503        struct i2c_client *client = to_i2c_client(dev);
 504        struct i2c_msg msgs[] = {
 505                { /* setup read ptr */
 506                        .addr = client->addr,
 507                        .len = 2,
 508                        .buf = int_addr
 509                },
 510                {/* read INT register */
 511
 512                        .addr = client->addr,
 513                        .flags = I2C_M_RD,
 514                        .len = 1,
 515                        .buf = &intreg
 516                },
 517        };
 518
 519        /* read interrupt register and status register */
 520        if (i2c_transfer(client->adapter, &msgs[0], 2) != 2) {
 521                dev_err(&client->dev, "%s: read error\n", __func__);
 522                return -EIO;
 523        }
 524        err = x1205_get_status(client, &status);
 525        if (err == 0) {
 526                alrm->pending = (status & X1205_SR_AL0) ? 1 : 0;
 527                alrm->enabled = (intreg & X1205_INT_AL0E) ? 1 : 0;
 528                err = x1205_get_datetime(client, &alrm->time, X1205_ALM0_BASE);
 529        }
 530        return err;
 531}
 532
 533static int x1205_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 534{
 535        return x1205_set_datetime(to_i2c_client(dev),
 536                &alrm->time, X1205_ALM0_BASE, alrm->enabled);
 537}
 538
 539static int x1205_rtc_read_time(struct device *dev, struct rtc_time *tm)
 540{
 541        return x1205_get_datetime(to_i2c_client(dev),
 542                tm, X1205_CCR_BASE);
 543}
 544
 545static int x1205_rtc_set_time(struct device *dev, struct rtc_time *tm)
 546{
 547        return x1205_set_datetime(to_i2c_client(dev),
 548                tm, X1205_CCR_BASE, 0);
 549}
 550
 551static int x1205_rtc_proc(struct device *dev, struct seq_file *seq)
 552{
 553        int err, dtrim, atrim;
 554
 555        err = x1205_get_dtrim(to_i2c_client(dev), &dtrim);
 556        if (!err)
 557                seq_printf(seq, "digital_trim\t: %d ppm\n", dtrim);
 558
 559        err = x1205_get_atrim(to_i2c_client(dev), &atrim);
 560        if (!err)
 561                seq_printf(seq, "analog_trim\t: %d.%02d pF\n",
 562                        atrim / 1000, atrim % 1000);
 563        return 0;
 564}
 565
 566static const struct rtc_class_ops x1205_rtc_ops = {
 567        .proc           = x1205_rtc_proc,
 568        .read_time      = x1205_rtc_read_time,
 569        .set_time       = x1205_rtc_set_time,
 570        .read_alarm     = x1205_rtc_read_alarm,
 571        .set_alarm      = x1205_rtc_set_alarm,
 572};
 573
 574static ssize_t x1205_sysfs_show_atrim(struct device *dev,
 575                                struct device_attribute *attr, char *buf)
 576{
 577        int err, atrim;
 578
 579        err = x1205_get_atrim(to_i2c_client(dev), &atrim);
 580        if (err)
 581                return err;
 582
 583        return sprintf(buf, "%d.%02d pF\n", atrim / 1000, atrim % 1000);
 584}
 585static DEVICE_ATTR(atrim, S_IRUGO, x1205_sysfs_show_atrim, NULL);
 586
 587static ssize_t x1205_sysfs_show_dtrim(struct device *dev,
 588                                struct device_attribute *attr, char *buf)
 589{
 590        int err, dtrim;
 591
 592        err = x1205_get_dtrim(to_i2c_client(dev), &dtrim);
 593        if (err)
 594                return err;
 595
 596        return sprintf(buf, "%d ppm\n", dtrim);
 597}
 598static DEVICE_ATTR(dtrim, S_IRUGO, x1205_sysfs_show_dtrim, NULL);
 599
 600static int x1205_sysfs_register(struct device *dev)
 601{
 602        int err;
 603
 604        err = device_create_file(dev, &dev_attr_atrim);
 605        if (err)
 606                return err;
 607
 608        err = device_create_file(dev, &dev_attr_dtrim);
 609        if (err)
 610                device_remove_file(dev, &dev_attr_atrim);
 611
 612        return err;
 613}
 614
 615static void x1205_sysfs_unregister(struct device *dev)
 616{
 617        device_remove_file(dev, &dev_attr_atrim);
 618        device_remove_file(dev, &dev_attr_dtrim);
 619}
 620
 621
 622static int x1205_probe(struct i2c_client *client,
 623                        const struct i2c_device_id *id)
 624{
 625        int err = 0;
 626        unsigned char sr;
 627        struct rtc_device *rtc;
 628
 629        dev_dbg(&client->dev, "%s\n", __func__);
 630
 631        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 632                return -ENODEV;
 633
 634        if (x1205_validate_client(client) < 0)
 635                return -ENODEV;
 636
 637        dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
 638
 639        rtc = devm_rtc_device_register(&client->dev, x1205_driver.driver.name,
 640                                        &x1205_rtc_ops, THIS_MODULE);
 641
 642        if (IS_ERR(rtc))
 643                return PTR_ERR(rtc);
 644
 645        i2c_set_clientdata(client, rtc);
 646
 647        /* Check for power failures and eventually enable the osc */
 648        err = x1205_get_status(client, &sr);
 649        if (!err) {
 650                if (sr & X1205_SR_RTCF) {
 651                        dev_err(&client->dev,
 652                                "power failure detected, "
 653                                "please set the clock\n");
 654                        udelay(50);
 655                        x1205_fix_osc(client);
 656                }
 657        } else {
 658                dev_err(&client->dev, "couldn't read status\n");
 659        }
 660
 661        err = x1205_sysfs_register(&client->dev);
 662        if (err)
 663                return err;
 664
 665        return 0;
 666}
 667
 668static int x1205_remove(struct i2c_client *client)
 669{
 670        x1205_sysfs_unregister(&client->dev);
 671        return 0;
 672}
 673
 674static const struct i2c_device_id x1205_id[] = {
 675        { "x1205", 0 },
 676        { }
 677};
 678MODULE_DEVICE_TABLE(i2c, x1205_id);
 679
 680static struct i2c_driver x1205_driver = {
 681        .driver         = {
 682                .name   = "rtc-x1205",
 683        },
 684        .probe          = x1205_probe,
 685        .remove         = x1205_remove,
 686        .id_table       = x1205_id,
 687};
 688
 689module_i2c_driver(x1205_driver);
 690
 691MODULE_AUTHOR(
 692        "Karen Spearel <kas111 at gmail dot com>, "
 693        "Alessandro Zummo <a.zummo@towertech.it>");
 694MODULE_DESCRIPTION("Xicor/Intersil X1205 RTC driver");
 695MODULE_LICENSE("GPL");
 696MODULE_VERSION(DRV_VERSION);
 697
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.