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 (1 << 1) 26 #define PCF8563_BIT_AF (1 << 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 int voltage_low; /* incicates if a low_voltage was detected */ 80 81 struct i2c_client *client; 82 #ifdef CONFIG_COMMON_CLK 83 struct clk_hw clkout_hw; 84 #endif 85 }; 86 87 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, 88 unsigned char length, unsigned char *buf) 89 { 90 struct i2c_msg msgs[] = { 91 {/* setup read ptr */ 92 .addr = client->addr, 93 .len = 1, 94 .buf = ®, 95 }, 96 { 97 .addr = client->addr, 98 .flags = I2C_M_RD, 99 .len = length, 100 .buf = buf 101 }, 102 }; 103 104 if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { 105 dev_err(&client->dev, "%s: read error\n", __func__); 106 return -EIO; 107 } 108 109 return 0; 110 } 111 112 static int pcf8563_write_block_data(struct i2c_client *client, 113 unsigned char reg, unsigned char length, 114 unsigned char *buf) 115 { 116 int i, err; 117 118 for (i = 0; i < length; i++) { 119 unsigned char data[2] = { reg + i, buf[i] }; 120 121 err = i2c_master_send(client, data, sizeof(data)); 122 if (err != sizeof(data)) { 123 dev_err(&client->dev, 124 "%s: err=%d addr=%02x, data=%02x\n", 125 __func__, err, data[0], data[1]); 126 return -EIO; 127 } 128 } 129 130 return 0; 131 } 132 133 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) 134 { 135 unsigned char buf; 136 int err; 137 138 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); 139 if (err < 0) 140 return err; 141 142 if (on) 143 buf |= PCF8563_BIT_AIE; 144 else 145 buf &= ~PCF8563_BIT_AIE; 146 147 buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); 148 149 err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); 150 if (err < 0) { 151 dev_err(&client->dev, "%s: write error\n", __func__); 152 return -EIO; 153 } 154 155 return 0; 156 } 157 158 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, 159 unsigned char *pen) 160 { 161 unsigned char buf; 162 int err; 163 164 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); 165 if (err) 166 return err; 167 168 if (en) 169 *en = !!(buf & PCF8563_BIT_AIE); 170 if (pen) 171 *pen = !!(buf & PCF8563_BIT_AF); 172 173 return 0; 174 } 175 176 static irqreturn_t pcf8563_irq(int irq, void *dev_id) 177 { 178 struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); 179 int err; 180 char pending; 181 182 err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); 183 if (err) 184 return IRQ_NONE; 185 186 if (pending) { 187 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); 188 pcf8563_set_alarm_mode(pcf8563->client, 1); 189 return IRQ_HANDLED; 190 } 191 192 return IRQ_NONE; 193 } 194 195 /* 196 * In the routines that deal directly with the pcf8563 hardware, we use 197 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. 198 */ 199 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) 200 { 201 struct i2c_client *client = to_i2c_client(dev); 202 struct pcf8563 *pcf8563 = i2c_get_clientdata(client); 203 unsigned char buf[9]; 204 int err; 205 206 err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); 207 if (err) 208 return err; 209 210 if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { 211 pcf8563->voltage_low = 1; 212 dev_err(&client->dev, 213 "low voltage detected, date/time is not reliable.\n"); 214 return -EINVAL; 215 } 216 217 dev_dbg(&client->dev, 218 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " 219 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", 220 __func__, 221 buf[0], buf[1], buf[2], buf[3], 222 buf[4], buf[5], buf[6], buf[7], 223 buf[8]); 224 225 226 tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); 227 tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); 228 tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ 229 tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); 230 tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; 231 tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ 232 tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]) + 100; 233 /* detect the polarity heuristically. see note above. */ 234 pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? 235 (tm->tm_year >= 100) : (tm->tm_year < 100); 236 237 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 238 "mday=%d, mon=%d, year=%d, wday=%d\n", 239 __func__, 240 tm->tm_sec, tm->tm_min, tm->tm_hour, 241 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 242 243 return 0; 244 } 245 246 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) 247 { 248 struct i2c_client *client = to_i2c_client(dev); 249 struct pcf8563 *pcf8563 = i2c_get_clientdata(client); 250 unsigned char buf[9]; 251 252 dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " 253 "mday=%d, mon=%d, year=%d, wday=%d\n", 254 __func__, 255 tm->tm_sec, tm->tm_min, tm->tm_hour, 256 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 257 258 /* hours, minutes and seconds */ 259 buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); 260 buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); 261 buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); 262 263 buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); 264 265 /* month, 1 - 12 */ 266 buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); 267 268 /* year and century */ 269 buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year - 100); 270 if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) 271 buf[PCF8563_REG_MO] |= PCF8563_MO_C; 272 273 buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; 274 275 return pcf8563_write_block_data(client, PCF8563_REG_SC, 276 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); 277 } 278 279 #ifdef CONFIG_RTC_INTF_DEV 280 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 281 { 282 struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); 283 struct rtc_time tm; 284 285 switch (cmd) { 286 case RTC_VL_READ: 287 if (pcf8563->voltage_low) 288 dev_info(dev, "low voltage detected, date/time is not reliable.\n"); 289 290 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, 291 sizeof(int))) 292 return -EFAULT; 293 return 0; 294 case RTC_VL_CLR: 295 /* 296 * Clear the VL bit in the seconds register in case 297 * the time has not been set already (which would 298 * have cleared it). This does not really matter 299 * because of the cached voltage_low value but do it 300 * anyway for consistency. 301 */ 302 if (pcf8563_rtc_read_time(dev, &tm)) 303 pcf8563_rtc_set_time(dev, &tm); 304 305 /* Clear the cached value. */ 306 pcf8563->voltage_low = 0; 307 308 return 0; 309 default: 310 return -ENOIOCTLCMD; 311 } 312 } 313 #else 314 #define pcf8563_rtc_ioctl NULL 315 #endif 316 317 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) 318 { 319 struct i2c_client *client = to_i2c_client(dev); 320 unsigned char buf[4]; 321 int err; 322 323 err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); 324 if (err) 325 return err; 326 327 dev_dbg(&client->dev, 328 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", 329 __func__, buf[0], buf[1], buf[2], buf[3]); 330 331 tm->time.tm_sec = 0; 332 tm->time.tm_min = bcd2bin(buf[0] & 0x7F); 333 tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); 334 tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); 335 tm->time.tm_wday = bcd2bin(buf[3] & 0x7); 336 337 err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); 338 if (err < 0) 339 return err; 340 341 dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," 342 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, 343 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, 344 tm->enabled, tm->pending); 345 346 return 0; 347 } 348 349 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) 350 { 351 struct i2c_client *client = to_i2c_client(dev); 352 unsigned char buf[4]; 353 int err; 354 355 /* The alarm has no seconds, round up to nearest minute */ 356 if (tm->time.tm_sec) { 357 time64_t alarm_time = rtc_tm_to_time64(&tm->time); 358 359 alarm_time += 60 - tm->time.tm_sec; 360 rtc_time64_to_tm(alarm_time, &tm->time); 361 } 362 363 dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " 364 "enabled=%d pending=%d\n", __func__, 365 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, 366 tm->time.tm_mday, tm->enabled, tm->pending); 367 368 buf[0] = bin2bcd(tm->time.tm_min); 369 buf[1] = bin2bcd(tm->time.tm_hour); 370 buf[2] = bin2bcd(tm->time.tm_mday); 371 buf[3] = tm->time.tm_wday & 0x07; 372 373 err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); 374 if (err) 375 return err; 376 377 return pcf8563_set_alarm_mode(client, !!tm->enabled); 378 } 379 380 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) 381 { 382 dev_dbg(dev, "%s: en=%d\n", __func__, enabled); 383 return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); 384 } 385 386 #ifdef CONFIG_COMMON_CLK 387 /* 388 * Handling of the clkout 389 */ 390 391 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw) 392 393 static int clkout_rates[] = { 394 32768, 395 1024, 396 32, 397 1, 398 }; 399 400 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw, 401 unsigned long parent_rate) 402 { 403 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 404 struct i2c_client *client = pcf8563->client; 405 unsigned char buf; 406 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 407 408 if (ret < 0) 409 return 0; 410 411 buf &= PCF8563_REG_CLKO_F_MASK; 412 return clkout_rates[buf]; 413 } 414 415 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, 416 unsigned long *prate) 417 { 418 int i; 419 420 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) 421 if (clkout_rates[i] <= rate) 422 return clkout_rates[i]; 423 424 return 0; 425 } 426 427 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, 428 unsigned long parent_rate) 429 { 430 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 431 struct i2c_client *client = pcf8563->client; 432 unsigned char buf; 433 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 434 int i; 435 436 if (ret < 0) 437 return ret; 438 439 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) 440 if (clkout_rates[i] == rate) { 441 buf &= ~PCF8563_REG_CLKO_F_MASK; 442 buf |= i; 443 ret = pcf8563_write_block_data(client, 444 PCF8563_REG_CLKO, 1, 445 &buf); 446 return ret; 447 } 448 449 return -EINVAL; 450 } 451 452 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable) 453 { 454 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 455 struct i2c_client *client = pcf8563->client; 456 unsigned char buf; 457 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 458 459 if (ret < 0) 460 return ret; 461 462 if (enable) 463 buf |= PCF8563_REG_CLKO_FE; 464 else 465 buf &= ~PCF8563_REG_CLKO_FE; 466 467 ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); 468 return ret; 469 } 470 471 static int pcf8563_clkout_prepare(struct clk_hw *hw) 472 { 473 return pcf8563_clkout_control(hw, 1); 474 } 475 476 static void pcf8563_clkout_unprepare(struct clk_hw *hw) 477 { 478 pcf8563_clkout_control(hw, 0); 479 } 480 481 static int pcf8563_clkout_is_prepared(struct clk_hw *hw) 482 { 483 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 484 struct i2c_client *client = pcf8563->client; 485 unsigned char buf; 486 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 487 488 if (ret < 0) 489 return ret; 490 491 return !!(buf & PCF8563_REG_CLKO_FE); 492 } 493 494 static const struct clk_ops pcf8563_clkout_ops = { 495 .prepare = pcf8563_clkout_prepare, 496 .unprepare = pcf8563_clkout_unprepare, 497 .is_prepared = pcf8563_clkout_is_prepared, 498 .recalc_rate = pcf8563_clkout_recalc_rate, 499 .round_rate = pcf8563_clkout_round_rate, 500 .set_rate = pcf8563_clkout_set_rate, 501 }; 502 503 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563) 504 { 505 struct i2c_client *client = pcf8563->client; 506 struct device_node *node = client->dev.of_node; 507 struct clk *clk; 508 struct clk_init_data init; 509 int ret; 510 unsigned char buf; 511 512 /* disable the clkout output */ 513 buf = 0; 514 ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); 515 if (ret < 0) 516 return ERR_PTR(ret); 517 518 init.name = "pcf8563-clkout"; 519 init.ops = &pcf8563_clkout_ops; 520 init.flags = 0; 521 init.parent_names = NULL; 522 init.num_parents = 0; 523 pcf8563->clkout_hw.init = &init; 524 525 /* optional override of the clockname */ 526 of_property_read_string(node, "clock-output-names", &init.name); 527 528 /* register the clock */ 529 clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw); 530 531 if (!IS_ERR(clk)) 532 of_clk_add_provider(node, of_clk_src_simple_get, clk); 533 534 return clk; 535 } 536 #endif 537 538 static const struct rtc_class_ops pcf8563_rtc_ops = { 539 .ioctl = pcf8563_rtc_ioctl, 540 .read_time = pcf8563_rtc_read_time, 541 .set_time = pcf8563_rtc_set_time, 542 .read_alarm = pcf8563_rtc_read_alarm, 543 .set_alarm = pcf8563_rtc_set_alarm, 544 .alarm_irq_enable = pcf8563_irq_enable, 545 }; 546 547 static int pcf8563_probe(struct i2c_client *client, 548 const struct i2c_device_id *id) 549 { 550 struct pcf8563 *pcf8563; 551 int err; 552 unsigned char buf; 553 554 dev_dbg(&client->dev, "%s\n", __func__); 555 556 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 557 return -ENODEV; 558 559 pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), 560 GFP_KERNEL); 561 if (!pcf8563) 562 return -ENOMEM; 563 564 i2c_set_clientdata(client, pcf8563); 565 pcf8563->client = client; 566 device_set_wakeup_capable(&client->dev, 1); 567 568 /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ 569 buf = PCF8563_TMRC_1_60; 570 err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); 571 if (err < 0) { 572 dev_err(&client->dev, "%s: write error\n", __func__); 573 return err; 574 } 575 576 /* Clear flags and disable interrupts */ 577 buf = 0; 578 err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); 579 if (err < 0) { 580 dev_err(&client->dev, "%s: write error\n", __func__); 581 return err; 582 } 583 584 pcf8563->rtc = devm_rtc_allocate_device(&client->dev); 585 if (IS_ERR(pcf8563->rtc)) 586 return PTR_ERR(pcf8563->rtc); 587 588 pcf8563->rtc->ops = &pcf8563_rtc_ops; 589 /* the pcf8563 alarm only supports a minute accuracy */ 590 pcf8563->rtc->uie_unsupported = 1; 591 pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; 592 pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099; 593 pcf8563->rtc->set_start_time = true; 594 595 if (client->irq > 0) { 596 err = devm_request_threaded_irq(&client->dev, client->irq, 597 NULL, pcf8563_irq, 598 IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW, 599 pcf8563_driver.driver.name, client); 600 if (err) { 601 dev_err(&client->dev, "unable to request IRQ %d\n", 602 client->irq); 603 return err; 604 } 605 } 606 607 err = rtc_register_device(pcf8563->rtc); 608 if (err) 609 return err; 610 611 #ifdef CONFIG_COMMON_CLK 612 /* register clk in common clk framework */ 613 pcf8563_clkout_register_clk(pcf8563); 614 #endif 615 616 return 0; 617 } 618 619 static const struct i2c_device_id pcf8563_id[] = { 620 { "pcf8563", 0 }, 621 { "rtc8564", 0 }, 622 { } 623 }; 624 MODULE_DEVICE_TABLE(i2c, pcf8563_id); 625 626 #ifdef CONFIG_OF 627 static const struct of_device_id pcf8563_of_match[] = { 628 { .compatible = "nxp,pcf8563" }, 629 { .compatible = "epson,rtc8564" }, 630 { .compatible = "microcrystal,rv8564" }, 631 {} 632 }; 633 MODULE_DEVICE_TABLE(of, pcf8563_of_match); 634 #endif 635 636 static struct i2c_driver pcf8563_driver = { 637 .driver = { 638 .name = "rtc-pcf8563", 639 .of_match_table = of_match_ptr(pcf8563_of_match), 640 }, 641 .probe = pcf8563_probe, 642 .id_table = pcf8563_id, 643 }; 644 645 module_i2c_driver(pcf8563_driver); 646 647 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 648 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); 649 MODULE_LICENSE("GPL"); 650