drivers/rtc/rtc-pcf8563.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * An I2C driver for the Philips PCF8563 RTC
   4  * Copyright 2005-06 Tower Technologies
   5  *
   6  * Author: Alessandro Zummo <a.zummo@towertech.it>
   7  * Maintainers: http://www.nslu2-linux.org/
   8  *
   9  * based on the other drivers in this same directory.
  10  *
  11  * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
  12  */
  13
  14 #include <linux/clk-provider.h>
  15 #include <linux/i2c.h>
  16 #include <linux/bcd.h>
  17 #include <linux/rtc.h>
  18 #include <linux/slab.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/err.h>
  22
  23 #define PCF8563_REG_ST1         0x00 /* status */
  24 #define PCF8563_REG_ST2         0x01
  25 #define PCF8563_BIT_AIE         BIT(1)
  26 #define PCF8563_BIT_AF          BIT(3)
  27 #define PCF8563_BITS_ST2_N      (7 << 5)
  28
  29 #define PCF8563_REG_SC          0x02 /* datetime */
  30 #define PCF8563_REG_MN          0x03
  31 #define PCF8563_REG_HR          0x04
  32 #define PCF8563_REG_DM          0x05
  33 #define PCF8563_REG_DW          0x06
  34 #define PCF8563_REG_MO          0x07
  35 #define PCF8563_REG_YR          0x08
  36
  37 #define PCF8563_REG_AMN         0x09 /* alarm */
  38
  39 #define PCF8563_REG_CLKO                0x0D /* clock out */
  40 #define PCF8563_REG_CLKO_FE             0x80 /* clock out enabled */
  41 #define PCF8563_REG_CLKO_F_MASK         0x03 /* frequenc mask */
  42 #define PCF8563_REG_CLKO_F_32768HZ      0x00
  43 #define PCF8563_REG_CLKO_F_1024HZ       0x01
  44 #define PCF8563_REG_CLKO_F_32HZ         0x02
  45 #define PCF8563_REG_CLKO_F_1HZ          0x03
  46
  47 #define PCF8563_REG_TMRC        0x0E /* timer control */
  48 #define PCF8563_TMRC_ENABLE     BIT(7)
  49 #define PCF8563_TMRC_4096       0
  50 #define PCF8563_TMRC_64         1
  51 #define PCF8563_TMRC_1          2
  52 #define PCF8563_TMRC_1_60       3
  53 #define PCF8563_TMRC_MASK       3
  54
  55 #define PCF8563_REG_TMR         0x0F /* timer */
  56
  57 #define PCF8563_SC_LV           0x80 /* low voltage */
  58 #define PCF8563_MO_C            0x80 /* century */
  59
  60 static struct i2c_driver pcf8563_driver;
  61
  62 struct pcf8563 {
  63         struct rtc_device *rtc;
  64         /*
  65          * The meaning of MO_C bit varies by the chip type.
  66          * From PCF8563 datasheet: this bit is toggled when the years
  67          * register overflows from 99 to 00
  68          *   0 indicates the century is 20xx
  69          *   1 indicates the century is 19xx
  70          * From RTC8564 datasheet: this bit indicates change of
  71          * century. When the year digit data overflows from 99 to 00,
  72          * this bit is set. By presetting it to 0 while still in the
  73          * 20th century, it will be set in year 2000, ...
  74          * There seems no reliable way to know how the system use this
  75          * bit.  So let's do it heuristically, assuming we are live in
  76          * 1970...2069.
  77          */
  78         int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
  79
  80         struct i2c_client *client;
  81 #ifdef CONFIG_COMMON_CLK
  82         struct clk_hw           clkout_hw;
  83 #endif
  84 };
  85
  86 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
  87                                    unsigned char length, unsigned char *buf)
  88 {
  89         struct i2c_msg msgs[] = {
  90                 {/* setup read ptr */
  91                         .addr = client->addr,
  92                         .len = 1,
  93                         .buf = &reg,
  94                 },
  95                 {
  96                         .addr = client->addr,
  97                         .flags = I2C_M_RD,
  98                         .len = length,
  99                         .buf = buf
 100                 },
 101         };
 102
 103         if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
 104                 dev_err(&client->dev, "%s: read error\n", __func__);
 105                 return -EIO;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int pcf8563_write_block_data(struct i2c_client *client,
 112                                    unsigned char reg, unsigned char length,
 113                                    unsigned char *buf)
 114 {
 115         int i, err;
 116
 117         for (i = 0; i < length; i++) {
 118                 unsigned char data[2] = { reg + i, buf[i] };
 119
 120                 err = i2c_master_send(client, data, sizeof(data));
 121                 if (err != sizeof(data)) {
 122                         dev_err(&client->dev,
 123                                 "%s: err=%d addr=%02x, data=%02x\n",
 124                                 __func__, err, data[0], data[1]);
 125                         return -EIO;
 126                 }
 127         }
 128
 129         return 0;
 130 }
 131
 132 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
 133 {
 134         unsigned char buf;
 135         int err;
 136
 137         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
 138         if (err < 0)
 139                 return err;
 140
 141         if (on)
 142                 buf |= PCF8563_BIT_AIE;
 143         else
 144                 buf &= ~PCF8563_BIT_AIE;
 145
 146         buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
 147
 148         err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
 149         if (err < 0) {
 150                 dev_err(&client->dev, "%s: write error\n", __func__);
 151                 return -EIO;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
 158                                   unsigned char *pen)
 159 {
 160         unsigned char buf;
 161         int err;
 162
 163         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
 164         if (err)
 165                 return err;
 166
 167         if (en)
 168                 *en = !!(buf & PCF8563_BIT_AIE);
 169         if (pen)
 170                 *pen = !!(buf & PCF8563_BIT_AF);
 171
 172         return 0;
 173 }
 174
 175 static irqreturn_t pcf8563_irq(int irq, void *dev_id)
 176 {
 177         struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
 178         int err;
 179         char pending;
 180
 181         err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
 182         if (err)
 183                 return IRQ_NONE;
 184
 185         if (pending) {
 186                 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
 187                 pcf8563_set_alarm_mode(pcf8563->client, 1);
 188                 return IRQ_HANDLED;
 189         }
 190
 191         return IRQ_NONE;
 192 }
 193
 194 /*
 195  * In the routines that deal directly with the pcf8563 hardware, we use
 196  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
 197  */
 198 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
 199 {
 200         struct i2c_client *client = to_i2c_client(dev);
 201         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
 202         unsigned char buf[9];
 203         int err;
 204
 205         err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
 206         if (err)
 207                 return err;
 208
 209         if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
 210                 dev_err(&client->dev,
 211                         "low voltage detected, date/time is not reliable.\n");
 212                 return -EINVAL;
 213         }
 214
 215         dev_dbg(&client->dev,
 216                 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
 217                 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
 218                 __func__,
 219                 buf[0], buf[1], buf[2], buf[3],
 220                 buf[4], buf[5], buf[6], buf[7],
 221                 buf[8]);
 222
 223
 224         tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
 225         tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
 226         tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
 227         tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
 228         tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
 229         tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
 230         tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100;
 231         /* detect the polarity heuristically. see note above. */
 232         pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
 233                 (tm->tm_year >= 100) : (tm->tm_year < 100);
 234
 235         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 236                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 237                 __func__,
 238                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 239                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 240
 241         return 0;
 242 }
 243
 244 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
 245 {
 246         struct i2c_client *client = to_i2c_client(dev);
 247         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
 248         unsigned char buf[9];
 249
 250         dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
 251                 "mday=%d, mon=%d, year=%d, wday=%d\n",
 252                 __func__,
 253                 tm->tm_sec, tm->tm_min, tm->tm_hour,
 254                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 255
 256         /* hours, minutes and seconds */
 257         buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
 258         buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
 259         buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
 260
 261         buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
 262
 263         /* month, 1 - 12 */
 264         buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
 265
 266         /* year and century */
 267         buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100);
 268         if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
 269                 buf[PCF8563_REG_MO] |= PCF8563_MO_C;
 270
 271         buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
 272
 273         return pcf8563_write_block_data(client, PCF8563_REG_SC,
 274                                 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
 275 }
 276
 277 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 278 {
 279         struct i2c_client *client = to_i2c_client(dev);
 280         int ret;
 281
 282         switch (cmd) {
 283         case RTC_VL_READ:
 284                 ret = i2c_smbus_read_byte_data(client, PCF8563_REG_SC);
 285                 if (ret < 0)
 286                         return ret;
 287
 288                 return put_user(ret & PCF8563_SC_LV ? RTC_VL_DATA_INVALID : 0,
 289                                 (unsigned int __user *)arg);
 290         default:
 291                 return -ENOIOCTLCMD;
 292         }
 293 }
 294
 295 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
 296 {
 297         struct i2c_client *client = to_i2c_client(dev);
 298         unsigned char buf[4];
 299         int err;
 300
 301         err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
 302         if (err)
 303                 return err;
 304
 305         dev_dbg(&client->dev,
 306                 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
 307                 __func__, buf[0], buf[1], buf[2], buf[3]);
 308
 309         tm->time.tm_sec = 0;
 310         tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
 311         tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
 312         tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
 313         tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
 314
 315         err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
 316         if (err < 0)
 317                 return err;
 318
 319         dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
 320                 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
 321                 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
 322                 tm->enabled, tm->pending);
 323
 324         return 0;
 325 }
 326
 327 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
 328 {
 329         struct i2c_client *client = to_i2c_client(dev);
 330         unsigned char buf[4];
 331         int err;
 332
 333         /* The alarm has no seconds, round up to nearest minute */
 334         if (tm->time.tm_sec) {
 335                 time64_t alarm_time = rtc_tm_to_time64(&tm->time);
 336
 337                 alarm_time += 60 - tm->time.tm_sec;
 338                 rtc_time64_to_tm(alarm_time, &tm->time);
 339         }
 340
 341         dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
 342                 "enabled=%d pending=%d\n", __func__,
 343                 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
 344                 tm->time.tm_mday, tm->enabled, tm->pending);
 345
 346         buf[0] = bin2bcd(tm->time.tm_min);
 347         buf[1] = bin2bcd(tm->time.tm_hour);
 348         buf[2] = bin2bcd(tm->time.tm_mday);
 349         buf[3] = tm->time.tm_wday & 0x07;
 350
 351         err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
 352         if (err)
 353                 return err;
 354
 355         return pcf8563_set_alarm_mode(client, !!tm->enabled);
 356 }
 357
 358 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
 359 {
 360         dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
 361         return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
 362 }
 363
 364 #ifdef CONFIG_COMMON_CLK
 365 /*
 366  * Handling of the clkout
 367  */
 368
 369 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw)
 370
 371 static const int clkout_rates[] = {
 372         32768,
 373         1024,
 374         32,
 375         1,
 376 };
 377
 378 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw,
 379                                                 unsigned long parent_rate)
 380 {
 381         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
 382         struct i2c_client *client = pcf8563->client;
 383         unsigned char buf;
 384         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
 385
 386         if (ret < 0)
 387                 return 0;
 388
 389         buf &= PCF8563_REG_CLKO_F_MASK;
 390         return clkout_rates[buf];
 391 }
 392
 393 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
 394                                       unsigned long *prate)
 395 {
 396         int i;
 397
 398         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
 399                 if (clkout_rates[i] <= rate)
 400                         return clkout_rates[i];
 401
 402         return 0;
 403 }
 404
 405 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
 406                                    unsigned long parent_rate)
 407 {
 408         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
 409         struct i2c_client *client = pcf8563->client;
 410         unsigned char buf;
 411         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
 412         int i;
 413
 414         if (ret < 0)
 415                 return ret;
 416
 417         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
 418                 if (clkout_rates[i] == rate) {
 419                         buf &= ~PCF8563_REG_CLKO_F_MASK;
 420                         buf |= i;
 421                         ret = pcf8563_write_block_data(client,
 422                                                        PCF8563_REG_CLKO, 1,
 423                                                        &buf);
 424                         return ret;
 425                 }
 426
 427         return -EINVAL;
 428 }
 429
 430 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable)
 431 {
 432         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
 433         struct i2c_client *client = pcf8563->client;
 434         unsigned char buf;
 435         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
 436
 437         if (ret < 0)
 438                 return ret;
 439
 440         if (enable)
 441                 buf |= PCF8563_REG_CLKO_FE;
 442         else
 443                 buf &= ~PCF8563_REG_CLKO_FE;
 444
 445         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
 446         return ret;
 447 }
 448
 449 static int pcf8563_clkout_prepare(struct clk_hw *hw)
 450 {
 451         return pcf8563_clkout_control(hw, 1);
 452 }
 453
 454 static void pcf8563_clkout_unprepare(struct clk_hw *hw)
 455 {
 456         pcf8563_clkout_control(hw, 0);
 457 }
 458
 459 static int pcf8563_clkout_is_prepared(struct clk_hw *hw)
 460 {
 461         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
 462         struct i2c_client *client = pcf8563->client;
 463         unsigned char buf;
 464         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
 465
 466         if (ret < 0)
 467                 return ret;
 468
 469         return !!(buf & PCF8563_REG_CLKO_FE);
 470 }
 471
 472 static const struct clk_ops pcf8563_clkout_ops = {
 473         .prepare = pcf8563_clkout_prepare,
 474         .unprepare = pcf8563_clkout_unprepare,
 475         .is_prepared = pcf8563_clkout_is_prepared,
 476         .recalc_rate = pcf8563_clkout_recalc_rate,
 477         .round_rate = pcf8563_clkout_round_rate,
 478         .set_rate = pcf8563_clkout_set_rate,
 479 };
 480
 481 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
 482 {
 483         struct i2c_client *client = pcf8563->client;
 484         struct device_node *node = client->dev.of_node;
 485         struct clk *clk;
 486         struct clk_init_data init;
 487         int ret;
 488         unsigned char buf;
 489
 490         /* disable the clkout output */
 491         buf = 0;
 492         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
 493         if (ret < 0)
 494                 return ERR_PTR(ret);
 495
 496         init.name = "pcf8563-clkout";
 497         init.ops = &pcf8563_clkout_ops;
 498         init.flags = 0;
 499         init.parent_names = NULL;
 500         init.num_parents = 0;
 501         pcf8563->clkout_hw.init = &init;
 502
 503         /* optional override of the clockname */
 504         of_property_read_string(node, "clock-output-names", &init.name);
 505
 506         /* register the clock */
 507         clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw);
 508
 509         if (!IS_ERR(clk))
 510                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
 511
 512         return clk;
 513 }
 514 #endif
 515
 516 static const struct rtc_class_ops pcf8563_rtc_ops = {
 517         .ioctl          = pcf8563_rtc_ioctl,
 518         .read_time      = pcf8563_rtc_read_time,
 519         .set_time       = pcf8563_rtc_set_time,
 520         .read_alarm     = pcf8563_rtc_read_alarm,
 521         .set_alarm      = pcf8563_rtc_set_alarm,
 522         .alarm_irq_enable = pcf8563_irq_enable,
 523 };
 524
 525 static int pcf8563_probe(struct i2c_client *client,
 526                                 const struct i2c_device_id *id)
 527 {
 528         struct pcf8563 *pcf8563;
 529         int err;
 530         unsigned char buf;
 531
 532         dev_dbg(&client->dev, "%s\n", __func__);
 533
 534         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 535                 return -ENODEV;
 536
 537         pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
 538                                 GFP_KERNEL);
 539         if (!pcf8563)
 540                 return -ENOMEM;
 541
 542         i2c_set_clientdata(client, pcf8563);
 543         pcf8563->client = client;
 544         device_set_wakeup_capable(&client->dev, 1);
 545
 546         /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
 547         buf = PCF8563_TMRC_1_60;
 548         err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
 549         if (err < 0) {
 550                 dev_err(&client->dev, "%s: write error\n", __func__);
 551                 return err;
 552         }
 553
 554         /* Clear flags and disable interrupts */
 555         buf = 0;
 556         err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
 557         if (err < 0) {
 558                 dev_err(&client->dev, "%s: write error\n", __func__);
 559                 return err;
 560         }
 561
 562         pcf8563->rtc = devm_rtc_allocate_device(&client->dev);
 563         if (IS_ERR(pcf8563->rtc))
 564                 return PTR_ERR(pcf8563->rtc);
 565
 566         pcf8563->rtc->ops = &pcf8563_rtc_ops;
 567         /* the pcf8563 alarm only supports a minute accuracy */
 568         pcf8563->rtc->uie_unsupported = 1;
 569         pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 570         pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099;
 571         pcf8563->rtc->set_start_time = true;
 572
 573         if (client->irq > 0) {
 574                 err = devm_request_threaded_irq(&client->dev, client->irq,
 575                                 NULL, pcf8563_irq,
 576                                 IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW,
 577                                 pcf8563_driver.driver.name, client);
 578                 if (err) {
 579                         dev_err(&client->dev, "unable to request IRQ %d\n",
 580                                                                 client->irq);
 581                         return err;
 582                 }
 583         }
 584
 585         err = devm_rtc_register_device(pcf8563->rtc);
 586         if (err)
 587                 return err;
 588
 589 #ifdef CONFIG_COMMON_CLK
 590         /* register clk in common clk framework */
 591         pcf8563_clkout_register_clk(pcf8563);
 592 #endif
 593
 594         return 0;
 595 }
 596
 597 static const struct i2c_device_id pcf8563_id[] = {
 598         { "pcf8563", 0 },
 599         { "rtc8564", 0 },
 600         { }
 601 };
 602 MODULE_DEVICE_TABLE(i2c, pcf8563_id);
 603
 604 #ifdef CONFIG_OF
 605 static const struct of_device_id pcf8563_of_match[] = {
 606         { .compatible = "nxp,pcf8563" },
 607         { .compatible = "epson,rtc8564" },
 608         { .compatible = "microcrystal,rv8564" },
 609         {}
 610 };
 611 MODULE_DEVICE_TABLE(of, pcf8563_of_match);
 612 #endif
 613
 614 static struct i2c_driver pcf8563_driver = {
 615         .driver         = {
 616                 .name   = "rtc-pcf8563",
 617                 .of_match_table = of_match_ptr(pcf8563_of_match),
 618         },
 619         .probe          = pcf8563_probe,
 620         .id_table       = pcf8563_id,
 621 };
 622
 623 module_i2c_driver(pcf8563_driver);
 624
 625 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 626 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
 627 MODULE_LICENSE("GPL");