drivers/rtc/rtc-rx8025.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for Epson's RTC module RX-8025 SA/NB
   4  *
   5  * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
   6  *
   7  * Copyright (C) 2005 by Digi International Inc.
   8  * All rights reserved.
   9  *
  10  * Modified by fengjh at rising.com.cn
  11  * <lm-sensors@lm-sensors.org>
  12  * 2006.11
  13  *
  14  * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
  15  * Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
  16  * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
  17  */
  18 #include <linux/bcd.h>
  19 #include <linux/bitops.h>
  20 #include <linux/i2c.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/rtc.h>
  24
  25 /* Register definitions */
  26 #define RX8025_REG_SEC          0x00
  27 #define RX8025_REG_MIN          0x01
  28 #define RX8025_REG_HOUR         0x02
  29 #define RX8025_REG_WDAY         0x03
  30 #define RX8025_REG_MDAY         0x04
  31 #define RX8025_REG_MONTH        0x05
  32 #define RX8025_REG_YEAR         0x06
  33 #define RX8025_REG_DIGOFF       0x07
  34 #define RX8025_REG_ALWMIN       0x08
  35 #define RX8025_REG_ALWHOUR      0x09
  36 #define RX8025_REG_ALWWDAY      0x0a
  37 #define RX8025_REG_ALDMIN       0x0b
  38 #define RX8025_REG_ALDHOUR      0x0c
  39 /* 0x0d is reserved */
  40 #define RX8025_REG_CTRL1        0x0e
  41 #define RX8025_REG_CTRL2        0x0f
  42
  43 #define RX8025_BIT_CTRL1_CT     (7 << 0)
  44 /* 1 Hz periodic level irq */
  45 #define RX8025_BIT_CTRL1_CT_1HZ 4
  46 #define RX8025_BIT_CTRL1_TEST   BIT(3)
  47 #define RX8025_BIT_CTRL1_1224   BIT(5)
  48 #define RX8025_BIT_CTRL1_DALE   BIT(6)
  49 #define RX8025_BIT_CTRL1_WALE   BIT(7)
  50
  51 #define RX8025_BIT_CTRL2_DAFG   BIT(0)
  52 #define RX8025_BIT_CTRL2_WAFG   BIT(1)
  53 #define RX8025_BIT_CTRL2_CTFG   BIT(2)
  54 #define RX8025_BIT_CTRL2_PON    BIT(4)
  55 #define RX8025_BIT_CTRL2_XST    BIT(5)
  56 #define RX8025_BIT_CTRL2_VDET   BIT(6)
  57
  58 #define RX8035_BIT_HOUR_1224    BIT(7)
  59
  60 /* Clock precision adjustment */
  61 #define RX8025_ADJ_RESOLUTION   3050 /* in ppb */
  62 #define RX8025_ADJ_DATA_MAX     62
  63 #define RX8025_ADJ_DATA_MIN     -62
  64
  65 enum rx_model {
  66         model_rx_unknown,
  67         model_rx_8025,
  68         model_rx_8035,
  69         model_last
  70 };
  71
  72 static const struct i2c_device_id rx8025_id[] = {
  73         { "rx8025", model_rx_8025 },
  74         { "rx8035", model_rx_8035 },
  75         { }
  76 };
  77 MODULE_DEVICE_TABLE(i2c, rx8025_id);
  78
  79 struct rx8025_data {
  80         struct rtc_device *rtc;
  81         enum rx_model model;
  82         u8 ctrl1;
  83         int is_24;
  84 };
  85
  86 static s32 rx8025_read_reg(const struct i2c_client *client, u8 number)
  87 {
  88         return i2c_smbus_read_byte_data(client, number << 4);
  89 }
  90
  91 static int rx8025_read_regs(const struct i2c_client *client,
  92                             u8 number, u8 length, u8 *values)
  93 {
  94         int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length,
  95                                                 values);
  96         if (ret != length)
  97                 return ret < 0 ? ret : -EIO;
  98
  99         return 0;
 100 }
 101
 102 static s32 rx8025_write_reg(const struct i2c_client *client, u8 number,
 103                             u8 value)
 104 {
 105         return i2c_smbus_write_byte_data(client, number << 4, value);
 106 }
 107
 108 static s32 rx8025_write_regs(const struct i2c_client *client,
 109                              u8 number, u8 length, const u8 *values)
 110 {
 111         return i2c_smbus_write_i2c_block_data(client, number << 4,
 112                                               length, values);
 113 }
 114
 115 static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2)
 116 {
 117         int xstp = ctrl2 & RX8025_BIT_CTRL2_XST;
 118         /* XSTP bit has different polarity on RX-8025 vs RX-8035.
 119          * RX-8025: 0 == oscillator stopped
 120          * RX-8035: 1 == oscillator stopped
 121          */
 122
 123         if (model == model_rx_8025)
 124                 xstp = !xstp;
 125
 126         return xstp;
 127 }
 128
 129 static int rx8025_check_validity(struct device *dev)
 130 {
 131         struct i2c_client *client = to_i2c_client(dev);
 132         struct rx8025_data *drvdata = dev_get_drvdata(dev);
 133         int ctrl2;
 134         int xstp;
 135
 136         ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
 137         if (ctrl2 < 0)
 138                 return ctrl2;
 139
 140         if (ctrl2 & RX8025_BIT_CTRL2_VDET)
 141                 dev_warn(dev, "power voltage drop detected\n");
 142
 143         if (ctrl2 & RX8025_BIT_CTRL2_PON) {
 144                 dev_warn(dev, "power-on reset detected, date is invalid\n");
 145                 return -EINVAL;
 146         }
 147
 148         xstp = rx8025_is_osc_stopped(drvdata->model, ctrl2);
 149         if (xstp) {
 150                 dev_warn(dev, "crystal stopped, date is invalid\n");
 151                 return -EINVAL;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int rx8025_reset_validity(struct i2c_client *client)
 158 {
 159         struct rx8025_data *drvdata = i2c_get_clientdata(client);
 160         int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
 161
 162         if (ctrl2 < 0)
 163                 return ctrl2;
 164
 165         ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
 166
 167         if (drvdata->model == model_rx_8025)
 168                 ctrl2 |= RX8025_BIT_CTRL2_XST;
 169         else
 170                 ctrl2 &= ~(RX8025_BIT_CTRL2_XST);
 171
 172         return rx8025_write_reg(client, RX8025_REG_CTRL2,
 173                                 ctrl2);
 174 }
 175
 176 static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
 177 {
 178         struct i2c_client *client = dev_id;
 179         struct rx8025_data *rx8025 = i2c_get_clientdata(client);
 180         int status, xstp;
 181
 182         rtc_lock(rx8025->rtc);
 183         status = rx8025_read_reg(client, RX8025_REG_CTRL2);
 184         if (status < 0)
 185                 goto out;
 186
 187         xstp = rx8025_is_osc_stopped(rx8025->model, status);
 188         if (xstp)
 189                 dev_warn(&client->dev, "Oscillation stop was detected,"
 190                          "you may have to readjust the clock\n");
 191
 192         if (status & RX8025_BIT_CTRL2_CTFG) {
 193                 /* periodic */
 194                 status &= ~RX8025_BIT_CTRL2_CTFG;
 195                 rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
 196         }
 197
 198         if (status & RX8025_BIT_CTRL2_DAFG) {
 199                 /* alarm */
 200                 status &= RX8025_BIT_CTRL2_DAFG;
 201                 if (rx8025_write_reg(client, RX8025_REG_CTRL1,
 202                                      rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
 203                         goto out;
 204                 rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
 205         }
 206
 207 out:
 208         rtc_unlock(rx8025->rtc);
 209
 210         return IRQ_HANDLED;
 211 }
 212
 213 static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
 214 {
 215         struct i2c_client *client = to_i2c_client(dev);
 216         struct rx8025_data *rx8025 = dev_get_drvdata(dev);
 217         u8 date[7];
 218         int err;
 219
 220         err = rx8025_check_validity(dev);
 221         if (err)
 222                 return err;
 223
 224         err = rx8025_read_regs(client, RX8025_REG_SEC, 7, date);
 225         if (err)
 226                 return err;
 227
 228         dev_dbg(dev, "%s: read %7ph\n", __func__, date);
 229
 230         dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
 231         dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
 232         if (rx8025->is_24)
 233                 dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
 234         else
 235                 dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
 236                         + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
 237
 238         dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
 239         dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
 240         dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100;
 241
 242         dev_dbg(dev, "%s: date %ptRr\n", __func__, dt);
 243
 244         return 0;
 245 }
 246
 247 static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
 248 {
 249         struct i2c_client *client = to_i2c_client(dev);
 250         struct rx8025_data *rx8025 = dev_get_drvdata(dev);
 251         u8 date[7];
 252         int ret;
 253
 254         if ((dt->tm_year < 100) || (dt->tm_year > 199))
 255                 return -EINVAL;
 256
 257         /*
 258          * Here the read-only bits are written as "0".  I'm not sure if that
 259          * is sound.
 260          */
 261         date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
 262         date[RX8025_REG_MIN] = bin2bcd(dt->tm_min);
 263         if (rx8025->is_24)
 264                 date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
 265         else
 266                 date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0)
 267                         | bin2bcd((dt->tm_hour + 11) % 12 + 1);
 268
 269         date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
 270         date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
 271         date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
 272         date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100);
 273
 274         dev_dbg(dev, "%s: write %7ph\n", __func__, date);
 275
 276         ret = rx8025_write_regs(client, RX8025_REG_SEC, 7, date);
 277         if (ret < 0)
 278                 return ret;
 279
 280         return rx8025_reset_validity(client);
 281 }
 282
 283 static int rx8025_init_client(struct i2c_client *client)
 284 {
 285         struct rx8025_data *rx8025 = i2c_get_clientdata(client);
 286         u8 ctrl[2], ctrl2;
 287         int need_clear = 0;
 288         int hour_reg;
 289         int err;
 290
 291         err = rx8025_read_regs(client, RX8025_REG_CTRL1, 2, ctrl);
 292         if (err)
 293                 goto out;
 294
 295         /* Keep test bit zero ! */
 296         rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;
 297
 298         if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
 299                 dev_warn(&client->dev, "Alarm was detected\n");
 300                 need_clear = 1;
 301         }
 302
 303         if (ctrl[1] & RX8025_BIT_CTRL2_CTFG)
 304                 need_clear = 1;
 305
 306         if (need_clear) {
 307                 ctrl2 = ctrl[1];
 308                 ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
 309                            RX8025_BIT_CTRL2_DAFG);
 310
 311                 err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
 312         }
 313
 314         if (rx8025->model == model_rx_8035) {
 315                 /* In RX-8035, 12/24 flag is in the hour register */
 316                 hour_reg = rx8025_read_reg(client, RX8025_REG_HOUR);
 317                 if (hour_reg < 0)
 318                         return hour_reg;
 319                 rx8025->is_24 = (hour_reg & RX8035_BIT_HOUR_1224);
 320         } else {
 321                 rx8025->is_24 = (ctrl[1] & RX8025_BIT_CTRL1_1224);
 322         }
 323 out:
 324         return err;
 325 }
 326
 327 /* Alarm support */
 328 static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 329 {
 330         struct i2c_client *client = to_i2c_client(dev);
 331         struct rx8025_data *rx8025 = dev_get_drvdata(dev);
 332         u8 ald[2];
 333         int ctrl2, err;
 334
 335         if (client->irq <= 0)
 336                 return -EINVAL;
 337
 338         err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald);
 339         if (err)
 340                 return err;
 341
 342         ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
 343         if (ctrl2 < 0)
 344                 return ctrl2;
 345
 346         dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
 347                 __func__, ald[0], ald[1], ctrl2);
 348
 349         /* Hardware alarms precision is 1 minute! */
 350         t->time.tm_sec = 0;
 351         t->time.tm_min = bcd2bin(ald[0] & 0x7f);
 352         if (rx8025->is_24)
 353                 t->time.tm_hour = bcd2bin(ald[1] & 0x3f);
 354         else
 355                 t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12
 356                         + (ald[1] & 0x20 ? 12 : 0);
 357
 358         dev_dbg(dev, "%s: date: %ptRr\n", __func__, &t->time);
 359         t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
 360         t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;
 361
 362         return err;
 363 }
 364
 365 static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 366 {
 367         struct i2c_client *client = to_i2c_client(dev);
 368         struct rx8025_data *rx8025 = dev_get_drvdata(dev);
 369         u8 ald[2];
 370         int err;
 371
 372         if (client->irq <= 0)
 373                 return -EINVAL;
 374
 375         /*
 376          * Hardware alarm precision is 1 minute!
 377          * round up to nearest minute
 378          */
 379         if (t->time.tm_sec) {
 380                 time64_t alarm_time = rtc_tm_to_time64(&t->time);
 381
 382                 alarm_time += 60 - t->time.tm_sec;
 383                 rtc_time64_to_tm(alarm_time, &t->time);
 384         }
 385
 386         ald[0] = bin2bcd(t->time.tm_min);
 387         if (rx8025->is_24)
 388                 ald[1] = bin2bcd(t->time.tm_hour);
 389         else
 390                 ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0)
 391                         | bin2bcd((t->time.tm_hour + 11) % 12 + 1);
 392
 393         dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]);
 394
 395         if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
 396                 rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
 397                 err = rx8025_write_reg(client, RX8025_REG_CTRL1,
 398                                        rx8025->ctrl1);
 399                 if (err)
 400                         return err;
 401         }
 402         err = rx8025_write_regs(client, RX8025_REG_ALDMIN, 2, ald);
 403         if (err)
 404                 return err;
 405
 406         if (t->enabled) {
 407                 rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
 408                 err = rx8025_write_reg(client, RX8025_REG_CTRL1,
 409                                        rx8025->ctrl1);
 410                 if (err)
 411                         return err;
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled)
 418 {
 419         struct i2c_client *client = to_i2c_client(dev);
 420         struct rx8025_data *rx8025 = dev_get_drvdata(dev);
 421         u8 ctrl1;
 422         int err;
 423
 424         ctrl1 = rx8025->ctrl1;
 425         if (enabled)
 426                 ctrl1 |= RX8025_BIT_CTRL1_DALE;
 427         else
 428                 ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
 429
 430         if (ctrl1 != rx8025->ctrl1) {
 431                 rx8025->ctrl1 = ctrl1;
 432                 err = rx8025_write_reg(client, RX8025_REG_CTRL1,
 433                                        rx8025->ctrl1);
 434                 if (err)
 435                         return err;
 436         }
 437         return 0;
 438 }
 439
 440 static const struct rtc_class_ops rx8025_rtc_ops = {
 441         .read_time = rx8025_get_time,
 442         .set_time = rx8025_set_time,
 443         .read_alarm = rx8025_read_alarm,
 444         .set_alarm = rx8025_set_alarm,
 445         .alarm_irq_enable = rx8025_alarm_irq_enable,
 446 };
 447
 448 /*
 449  * Clock precision adjustment support
 450  *
 451  * According to the RX8025 SA/NB application manual the frequency and
 452  * temperature characteristics can be approximated using the following
 453  * equation:
 454  *
 455  *   df = a * (ut - t)**2
 456  *
 457  *   df: Frequency deviation in any temperature
 458  *   a : Coefficient = (-35 +-5) * 10**-9
 459  *   ut: Ultimate temperature in degree = +25 +-5 degree
 460  *   t : Any temperature in degree
 461  *
 462  * Note that the clock adjustment in ppb must be entered (which is
 463  * the negative value of the deviation).
 464  */
 465 static int rx8025_get_clock_adjust(struct device *dev, int *adj)
 466 {
 467         struct i2c_client *client = to_i2c_client(dev);
 468         int digoff;
 469
 470         digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF);
 471         if (digoff < 0)
 472                 return digoff;
 473
 474         *adj = digoff >= 64 ? digoff - 128 : digoff;
 475         if (*adj > 0)
 476                 (*adj)--;
 477         *adj *= -RX8025_ADJ_RESOLUTION;
 478
 479         return 0;
 480 }
 481
 482 static int rx8025_set_clock_adjust(struct device *dev, int adj)
 483 {
 484         struct i2c_client *client = to_i2c_client(dev);
 485         u8 digoff;
 486         int err;
 487
 488         adj /= -RX8025_ADJ_RESOLUTION;
 489         if (adj > RX8025_ADJ_DATA_MAX)
 490                 adj = RX8025_ADJ_DATA_MAX;
 491         else if (adj < RX8025_ADJ_DATA_MIN)
 492                 adj = RX8025_ADJ_DATA_MIN;
 493         else if (adj > 0)
 494                 adj++;
 495         else if (adj < 0)
 496                 adj += 128;
 497         digoff = adj;
 498
 499         err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);
 500         if (err)
 501                 return err;
 502
 503         dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff);
 504
 505         return 0;
 506 }
 507
 508 static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
 509                                               struct device_attribute *attr,
 510                                               char *buf)
 511 {
 512         int err, adj;
 513
 514         err = rx8025_get_clock_adjust(dev, &adj);
 515         if (err)
 516                 return err;
 517
 518         return sprintf(buf, "%d\n", adj);
 519 }
 520
 521 static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
 522                                                struct device_attribute *attr,
 523                                                const char *buf, size_t count)
 524 {
 525         int adj, err;
 526
 527         if (sscanf(buf, "%i", &adj) != 1)
 528                 return -EINVAL;
 529
 530         err = rx8025_set_clock_adjust(dev, adj);
 531
 532         return err ? err : count;
 533 }
 534
 535 static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
 536                    rx8025_sysfs_show_clock_adjust,
 537                    rx8025_sysfs_store_clock_adjust);
 538
 539 static int rx8025_sysfs_register(struct device *dev)
 540 {
 541         return device_create_file(dev, &dev_attr_clock_adjust_ppb);
 542 }
 543
 544 static void rx8025_sysfs_unregister(struct device *dev)
 545 {
 546         device_remove_file(dev, &dev_attr_clock_adjust_ppb);
 547 }
 548
 549 static int rx8025_probe(struct i2c_client *client,
 550                         const struct i2c_device_id *id)
 551 {
 552         struct i2c_adapter *adapter = client->adapter;
 553         struct rx8025_data *rx8025;
 554         int err = 0;
 555
 556         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 557                                      | I2C_FUNC_SMBUS_I2C_BLOCK)) {
 558                 dev_err(&adapter->dev,
 559                         "doesn't support required functionality\n");
 560                 return -EIO;
 561         }
 562
 563         rx8025 = devm_kzalloc(&client->dev, sizeof(*rx8025), GFP_KERNEL);
 564         if (!rx8025)
 565                 return -ENOMEM;
 566
 567         i2c_set_clientdata(client, rx8025);
 568
 569         if (id)
 570                 rx8025->model = id->driver_data;
 571
 572         err = rx8025_init_client(client);
 573         if (err)
 574                 return err;
 575
 576         rx8025->rtc = devm_rtc_device_register(&client->dev, client->name,
 577                                           &rx8025_rtc_ops, THIS_MODULE);
 578         if (IS_ERR(rx8025->rtc)) {
 579                 dev_err(&client->dev, "unable to register the class device\n");
 580                 return PTR_ERR(rx8025->rtc);
 581         }
 582
 583         if (client->irq > 0) {
 584                 dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
 585                 err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 586                                                 rx8025_handle_irq,
 587                                                 IRQF_ONESHOT,
 588                                                 "rx8025", client);
 589                 if (err) {
 590                         dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
 591                         client->irq = 0;
 592                 }
 593         }
 594
 595         rx8025->rtc->max_user_freq = 1;
 596
 597         /* the rx8025 alarm only supports a minute accuracy */
 598         rx8025->rtc->uie_unsupported = 1;
 599
 600         err = rx8025_sysfs_register(&client->dev);
 601         return err;
 602 }
 603
 604 static int rx8025_remove(struct i2c_client *client)
 605 {
 606         rx8025_sysfs_unregister(&client->dev);
 607         return 0;
 608 }
 609
 610 static struct i2c_driver rx8025_driver = {
 611         .driver = {
 612                 .name = "rtc-rx8025",
 613         },
 614         .probe          = rx8025_probe,
 615         .remove         = rx8025_remove,
 616         .id_table       = rx8025_id,
 617 };
 618
 619 module_i2c_driver(rx8025_driver);
 620
 621 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
 622 MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
 623 MODULE_LICENSE("GPL");