1 /* 2 * An I2C driver for the Philips PCF8563 RTC 3 * Copyright 2005-06 Tower Technologies 4 * 5 * Author: Alessandro Zummo <a.zummo@towertech.it> 6 * Maintainers: http://www.nslu2-linux.org/ 7 * 8 * based on the other drivers in this same directory. 9 * 10 * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17 #include <linux/clk-provider.h> 18 #include <linux/i2c.h> 19 #include <linux/bcd.h> 20 #include <linux/rtc.h> 21 #include <linux/slab.h> 22 #include <linux/module.h> 23 #include <linux/of.h> 24 #include <linux/err.h> 25 26 #define PCF8563_REG_ST1 0x00 /* status */ 27 #define PCF8563_REG_ST2 0x01 28 #define PCF8563_BIT_AIE (1 << 1) 29 #define PCF8563_BIT_AF (1 << 3) 30 #define PCF8563_BITS_ST2_N (7 << 5) 31 32 #define PCF8563_REG_SC 0x02 /* datetime */ 33 #define PCF8563_REG_MN 0x03 34 #define PCF8563_REG_HR 0x04 35 #define PCF8563_REG_DM 0x05 36 #define PCF8563_REG_DW 0x06 37 #define PCF8563_REG_MO 0x07 38 #define PCF8563_REG_YR 0x08 39 40 #define PCF8563_REG_AMN 0x09 /* alarm */ 41 42 #define PCF8563_REG_CLKO 0x0D /* clock out */ 43 #define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */ 44 #define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */ 45 #define PCF8563_REG_CLKO_F_32768HZ 0x00 46 #define PCF8563_REG_CLKO_F_1024HZ 0x01 47 #define PCF8563_REG_CLKO_F_32HZ 0x02 48 #define PCF8563_REG_CLKO_F_1HZ 0x03 49 50 #define PCF8563_REG_TMRC 0x0E /* timer control */ 51 #define PCF8563_TMRC_ENABLE BIT(7) 52 #define PCF8563_TMRC_4096 0 53 #define PCF8563_TMRC_64 1 54 #define PCF8563_TMRC_1 2 55 #define PCF8563_TMRC_1_60 3 56 #define PCF8563_TMRC_MASK 3 57 58 #define PCF8563_REG_TMR 0x0F /* timer */ 59 60 #define PCF8563_SC_LV 0x80 /* low voltage */ 61 #define PCF8563_MO_C 0x80 /* century */ 62 63 static struct i2c_driver pcf8563_driver; 64 65 struct pcf8563 { 66 struct rtc_device *rtc; 67 /* 68 * The meaning of MO_C bit varies by the chip type. 69 * From PCF8563 datasheet: this bit is toggled when the years 70 * register overflows from 99 to 00 71 * 0 indicates the century is 20xx 72 * 1 indicates the century is 19xx 73 * From RTC8564 datasheet: this bit indicates change of 74 * century. When the year digit data overflows from 99 to 00, 75 * this bit is set. By presetting it to 0 while still in the 76 * 20th century, it will be set in year 2000, ... 77 * There seems no reliable way to know how the system use this 78 * bit. So let's do it heuristically, assuming we are live in 79 * 1970...2069. 80 */ 81 int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ 82 int voltage_low; /* incicates if a low_voltage was detected */ 83 84 struct i2c_client *client; 85 #ifdef CONFIG_COMMON_CLK 86 struct clk_hw clkout_hw; 87 #endif 88 }; 89 90 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, 91 unsigned char length, unsigned char *buf) 92 { 93 struct i2c_msg msgs[] = { 94 {/* setup read ptr */ 95 .addr = client->addr, 96 .len = 1, 97 .buf = ®, 98 }, 99 { 100 .addr = client->addr, 101 .flags = I2C_M_RD, 102 .len = length, 103 .buf = buf 104 }, 105 }; 106 107 if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { 108 dev_err(&client->dev, "%s: read error\n", __func__); 109 return -EIO; 110 } 111 112 return 0; 113 } 114 115 static int pcf8563_write_block_data(struct i2c_client *client, 116 unsigned char reg, unsigned char length, 117 unsigned char *buf) 118 { 119 int i, err; 120 121 for (i = 0; i < length; i++) { 122 unsigned char data[2] = { reg + i, buf[i] }; 123 124 err = i2c_master_send(client, data, sizeof(data)); 125 if (err != sizeof(data)) { 126 dev_err(&client->dev, 127 "%s: err=%d addr=%02x, data=%02x\n", 128 __func__, err, data[0], data[1]); 129 return -EIO; 130 } 131 } 132 133 return 0; 134 } 135 136 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) 137 { 138 unsigned char buf; 139 int err; 140 141 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); 142 if (err < 0) 143 return err; 144 145 if (on) 146 buf |= PCF8563_BIT_AIE; 147 else 148 buf &= ~PCF8563_BIT_AIE; 149 150 buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); 151 152 err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); 153 if (err < 0) { 154 dev_err(&client->dev, "%s: write error\n", __func__); 155 return -EIO; 156 } 157 158 return 0; 159 } 160 161 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, 162 unsigned char *pen) 163 { 164 unsigned char buf; 165 int err; 166 167 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); 168 if (err) 169 return err; 170 171 if (en) 172 *en = !!(buf & PCF8563_BIT_AIE); 173 if (pen) 174 *pen = !!(buf & PCF8563_BIT_AF); 175 176 return 0; 177 } 178 179 static irqreturn_t pcf8563_irq(int irq, void *dev_id) 180 { 181 struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); 182 int err; 183 char pending; 184 185 err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); 186 if (err) 187 return IRQ_NONE; 188 189 if (pending) { 190 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); 191 pcf8563_set_alarm_mode(pcf8563->client, 1); 192 return IRQ_HANDLED; 193 } 194 195 return IRQ_NONE; 196 } 197 198 /* 199 * In the routines that deal directly with the pcf8563 hardware, we use 200 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. 201 */ 202 static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) 203 { 204 struct pcf8563 *pcf8563 = i2c_get_clientdata(client); 205 unsigned char buf[9]; 206 int err; 207 208 err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); 209 if (err) 210 return err; 211 212 if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { 213 pcf8563->voltage_low = 1; 214 dev_err(&client->dev, 215 "low voltage detected, date/time is not reliable.\n"); 216 return -EINVAL; 217 } 218 219 dev_dbg(&client->dev, 220 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " 221 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", 222 __func__, 223 buf[0], buf[1], buf[2], buf[3], 224 buf[4], buf[5], buf[6], buf[7], 225 buf[8]); 226 227 228 tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); 229 tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); 230 tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ 231 tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); 232 tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; 233 tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ 234 tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); 235 if (tm->tm_year < 70) 236 tm->tm_year += 100; /* assume we are in 1970...2069 */ 237 /* detect the polarity heuristically. see note above. */ 238 pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? 239 (tm->tm_year >= 100) : (tm->tm_year < 100); 240 241 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 242 "mday=%d, mon=%d, year=%d, wday=%d\n", 243 __func__, 244 tm->tm_sec, tm->tm_min, tm->tm_hour, 245 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 246 247 return 0; 248 } 249 250 static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) 251 { 252 struct pcf8563 *pcf8563 = i2c_get_clientdata(client); 253 unsigned char buf[9]; 254 255 dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " 256 "mday=%d, mon=%d, year=%d, wday=%d\n", 257 __func__, 258 tm->tm_sec, tm->tm_min, tm->tm_hour, 259 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 260 261 /* hours, minutes and seconds */ 262 buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); 263 buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); 264 buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); 265 266 buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); 267 268 /* month, 1 - 12 */ 269 buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); 270 271 /* year and century */ 272 buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); 273 if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) 274 buf[PCF8563_REG_MO] |= PCF8563_MO_C; 275 276 buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; 277 278 return pcf8563_write_block_data(client, PCF8563_REG_SC, 279 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); 280 } 281 282 #ifdef CONFIG_RTC_INTF_DEV 283 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 284 { 285 struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); 286 struct rtc_time tm; 287 288 switch (cmd) { 289 case RTC_VL_READ: 290 if (pcf8563->voltage_low) 291 dev_info(dev, "low voltage detected, date/time is not reliable.\n"); 292 293 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, 294 sizeof(int))) 295 return -EFAULT; 296 return 0; 297 case RTC_VL_CLR: 298 /* 299 * Clear the VL bit in the seconds register in case 300 * the time has not been set already (which would 301 * have cleared it). This does not really matter 302 * because of the cached voltage_low value but do it 303 * anyway for consistency. 304 */ 305 if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) 306 pcf8563_set_datetime(to_i2c_client(dev), &tm); 307 308 /* Clear the cached value. */ 309 pcf8563->voltage_low = 0; 310 311 return 0; 312 default: 313 return -ENOIOCTLCMD; 314 } 315 } 316 #else 317 #define pcf8563_rtc_ioctl NULL 318 #endif 319 320 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) 321 { 322 return pcf8563_get_datetime(to_i2c_client(dev), tm); 323 } 324 325 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) 326 { 327 return pcf8563_set_datetime(to_i2c_client(dev), tm); 328 } 329 330 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) 331 { 332 struct i2c_client *client = to_i2c_client(dev); 333 unsigned char buf[4]; 334 int err; 335 336 err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); 337 if (err) 338 return err; 339 340 dev_dbg(&client->dev, 341 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", 342 __func__, buf[0], buf[1], buf[2], buf[3]); 343 344 tm->time.tm_sec = 0; 345 tm->time.tm_min = bcd2bin(buf[0] & 0x7F); 346 tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); 347 tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); 348 tm->time.tm_wday = bcd2bin(buf[3] & 0x7); 349 350 err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); 351 if (err < 0) 352 return err; 353 354 dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," 355 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, 356 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, 357 tm->enabled, tm->pending); 358 359 return 0; 360 } 361 362 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) 363 { 364 struct i2c_client *client = to_i2c_client(dev); 365 unsigned char buf[4]; 366 int err; 367 368 /* The alarm has no seconds, round up to nearest minute */ 369 if (tm->time.tm_sec) { 370 time64_t alarm_time = rtc_tm_to_time64(&tm->time); 371 372 alarm_time += 60 - tm->time.tm_sec; 373 rtc_time64_to_tm(alarm_time, &tm->time); 374 } 375 376 dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " 377 "enabled=%d pending=%d\n", __func__, 378 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, 379 tm->time.tm_mday, tm->enabled, tm->pending); 380 381 buf[0] = bin2bcd(tm->time.tm_min); 382 buf[1] = bin2bcd(tm->time.tm_hour); 383 buf[2] = bin2bcd(tm->time.tm_mday); 384 buf[3] = tm->time.tm_wday & 0x07; 385 386 err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); 387 if (err) 388 return err; 389 390 return pcf8563_set_alarm_mode(client, !!tm->enabled); 391 } 392 393 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) 394 { 395 dev_dbg(dev, "%s: en=%d\n", __func__, enabled); 396 return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); 397 } 398 399 #ifdef CONFIG_COMMON_CLK 400 /* 401 * Handling of the clkout 402 */ 403 404 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw) 405 406 static int clkout_rates[] = { 407 32768, 408 1024, 409 32, 410 1, 411 }; 412 413 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw, 414 unsigned long parent_rate) 415 { 416 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 417 struct i2c_client *client = pcf8563->client; 418 unsigned char buf; 419 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 420 421 if (ret < 0) 422 return 0; 423 424 buf &= PCF8563_REG_CLKO_F_MASK; 425 return clkout_rates[buf]; 426 } 427 428 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, 429 unsigned long *prate) 430 { 431 int i; 432 433 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) 434 if (clkout_rates[i] <= rate) 435 return clkout_rates[i]; 436 437 return 0; 438 } 439 440 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, 441 unsigned long parent_rate) 442 { 443 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 444 struct i2c_client *client = pcf8563->client; 445 unsigned char buf; 446 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 447 int i; 448 449 if (ret < 0) 450 return ret; 451 452 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) 453 if (clkout_rates[i] == rate) { 454 buf &= ~PCF8563_REG_CLKO_F_MASK; 455 buf |= i; 456 ret = pcf8563_write_block_data(client, 457 PCF8563_REG_CLKO, 1, 458 &buf); 459 return ret; 460 } 461 462 return -EINVAL; 463 } 464 465 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable) 466 { 467 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 468 struct i2c_client *client = pcf8563->client; 469 unsigned char buf; 470 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 471 472 if (ret < 0) 473 return ret; 474 475 if (enable) 476 buf |= PCF8563_REG_CLKO_FE; 477 else 478 buf &= ~PCF8563_REG_CLKO_FE; 479 480 ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); 481 return ret; 482 } 483 484 static int pcf8563_clkout_prepare(struct clk_hw *hw) 485 { 486 return pcf8563_clkout_control(hw, 1); 487 } 488 489 static void pcf8563_clkout_unprepare(struct clk_hw *hw) 490 { 491 pcf8563_clkout_control(hw, 0); 492 } 493 494 static int pcf8563_clkout_is_prepared(struct clk_hw *hw) 495 { 496 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 497 struct i2c_client *client = pcf8563->client; 498 unsigned char buf; 499 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 500 501 if (ret < 0) 502 return ret; 503 504 return !!(buf & PCF8563_REG_CLKO_FE); 505 } 506 507 static const struct clk_ops pcf8563_clkout_ops = { 508 .prepare = pcf8563_clkout_prepare, 509 .unprepare = pcf8563_clkout_unprepare, 510 .is_prepared = pcf8563_clkout_is_prepared, 511 .recalc_rate = pcf8563_clkout_recalc_rate, 512 .round_rate = pcf8563_clkout_round_rate, 513 .set_rate = pcf8563_clkout_set_rate, 514 }; 515 516 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563) 517 { 518 struct i2c_client *client = pcf8563->client; 519 struct device_node *node = client->dev.of_node; 520 struct clk *clk; 521 struct clk_init_data init; 522 int ret; 523 unsigned char buf; 524 525 /* disable the clkout output */ 526 buf = 0; 527 ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); 528 if (ret < 0) 529 return ERR_PTR(ret); 530 531 init.name = "pcf8563-clkout"; 532 init.ops = &pcf8563_clkout_ops; 533 init.flags = 0; 534 init.parent_names = NULL; 535 init.num_parents = 0; 536 pcf8563->clkout_hw.init = &init; 537 538 /* optional override of the clockname */ 539 of_property_read_string(node, "clock-output-names", &init.name); 540 541 /* register the clock */ 542 clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw); 543 544 if (!IS_ERR(clk)) 545 of_clk_add_provider(node, of_clk_src_simple_get, clk); 546 547 return clk; 548 } 549 #endif 550 551 static const struct rtc_class_ops pcf8563_rtc_ops = { 552 .ioctl = pcf8563_rtc_ioctl, 553 .read_time = pcf8563_rtc_read_time, 554 .set_time = pcf8563_rtc_set_time, 555 .read_alarm = pcf8563_rtc_read_alarm, 556 .set_alarm = pcf8563_rtc_set_alarm, 557 .alarm_irq_enable = pcf8563_irq_enable, 558 }; 559 560 static int pcf8563_probe(struct i2c_client *client, 561 const struct i2c_device_id *id) 562 { 563 struct pcf8563 *pcf8563; 564 int err; 565 unsigned char buf; 566 unsigned char alm_pending; 567 568 dev_dbg(&client->dev, "%s\n", __func__); 569 570 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 571 return -ENODEV; 572 573 pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), 574 GFP_KERNEL); 575 if (!pcf8563) 576 return -ENOMEM; 577 578 i2c_set_clientdata(client, pcf8563); 579 pcf8563->client = client; 580 device_set_wakeup_capable(&client->dev, 1); 581 582 /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ 583 buf = PCF8563_TMRC_1_60; 584 err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); 585 if (err < 0) { 586 dev_err(&client->dev, "%s: write error\n", __func__); 587 return err; 588 } 589 590 err = pcf8563_get_alarm_mode(client, NULL, &alm_pending); 591 if (err) { 592 dev_err(&client->dev, "%s: read error\n", __func__); 593 return err; 594 } 595 if (alm_pending) 596 pcf8563_set_alarm_mode(client, 0); 597 598 pcf8563->rtc = devm_rtc_device_register(&client->dev, 599 pcf8563_driver.driver.name, 600 &pcf8563_rtc_ops, THIS_MODULE); 601 602 if (IS_ERR(pcf8563->rtc)) 603 return PTR_ERR(pcf8563->rtc); 604 605 if (client->irq > 0) { 606 err = devm_request_threaded_irq(&client->dev, client->irq, 607 NULL, pcf8563_irq, 608 IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, 609 pcf8563_driver.driver.name, client); 610 if (err) { 611 dev_err(&client->dev, "unable to request IRQ %d\n", 612 client->irq); 613 return err; 614 } 615 616 } 617 618 #ifdef CONFIG_COMMON_CLK 619 /* register clk in common clk framework */ 620 pcf8563_clkout_register_clk(pcf8563); 621 #endif 622 623 /* the pcf8563 alarm only supports a minute accuracy */ 624 pcf8563->rtc->uie_unsupported = 1; 625 626 return 0; 627 } 628 629 static const struct i2c_device_id pcf8563_id[] = { 630 { "pcf8563", 0 }, 631 { "rtc8564", 0 }, 632 { } 633 }; 634 MODULE_DEVICE_TABLE(i2c, pcf8563_id); 635 636 #ifdef CONFIG_OF 637 static const struct of_device_id pcf8563_of_match[] = { 638 { .compatible = "nxp,pcf8563" }, 639 {} 640 }; 641 MODULE_DEVICE_TABLE(of, pcf8563_of_match); 642 #endif 643 644 static struct i2c_driver pcf8563_driver = { 645 .driver = { 646 .name = "rtc-pcf8563", 647 .of_match_table = of_match_ptr(pcf8563_of_match), 648 }, 649 .probe = pcf8563_probe, 650 .id_table = pcf8563_id, 651 }; 652 653 module_i2c_driver(pcf8563_driver); 654 655 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 656 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); 657 MODULE_LICENSE("GPL"); 658