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 DRV_VERSION "0.4.4" 27 28 #define PCF8563_REG_ST1 0x00 /* status */ 29 #define PCF8563_REG_ST2 0x01 30 #define PCF8563_BIT_AIE (1 << 1) 31 #define PCF8563_BIT_AF (1 << 3) 32 #define PCF8563_BITS_ST2_N (7 << 5) 33 34 #define PCF8563_REG_SC 0x02 /* datetime */ 35 #define PCF8563_REG_MN 0x03 36 #define PCF8563_REG_HR 0x04 37 #define PCF8563_REG_DM 0x05 38 #define PCF8563_REG_DW 0x06 39 #define PCF8563_REG_MO 0x07 40 #define PCF8563_REG_YR 0x08 41 42 #define PCF8563_REG_AMN 0x09 /* alarm */ 43 44 #define PCF8563_REG_CLKO 0x0D /* clock out */ 45 #define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */ 46 #define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */ 47 #define PCF8563_REG_CLKO_F_32768HZ 0x00 48 #define PCF8563_REG_CLKO_F_1024HZ 0x01 49 #define PCF8563_REG_CLKO_F_32HZ 0x02 50 #define PCF8563_REG_CLKO_F_1HZ 0x03 51 52 #define PCF8563_REG_TMRC 0x0E /* timer control */ 53 #define PCF8563_TMRC_ENABLE BIT(7) 54 #define PCF8563_TMRC_4096 0 55 #define PCF8563_TMRC_64 1 56 #define PCF8563_TMRC_1 2 57 #define PCF8563_TMRC_1_60 3 58 #define PCF8563_TMRC_MASK 3 59 60 #define PCF8563_REG_TMR 0x0F /* timer */ 61 62 #define PCF8563_SC_LV 0x80 /* low voltage */ 63 #define PCF8563_MO_C 0x80 /* century */ 64 65 static struct i2c_driver pcf8563_driver; 66 67 struct pcf8563 { 68 struct rtc_device *rtc; 69 /* 70 * The meaning of MO_C bit varies by the chip type. 71 * From PCF8563 datasheet: this bit is toggled when the years 72 * register overflows from 99 to 00 73 * 0 indicates the century is 20xx 74 * 1 indicates the century is 19xx 75 * From RTC8564 datasheet: this bit indicates change of 76 * century. When the year digit data overflows from 99 to 00, 77 * this bit is set. By presetting it to 0 while still in the 78 * 20th century, it will be set in year 2000, ... 79 * There seems no reliable way to know how the system use this 80 * bit. So let's do it heuristically, assuming we are live in 81 * 1970...2069. 82 */ 83 int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ 84 int voltage_low; /* incicates if a low_voltage was detected */ 85 86 struct i2c_client *client; 87 #ifdef CONFIG_COMMON_CLK 88 struct clk_hw clkout_hw; 89 #endif 90 }; 91 92 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, 93 unsigned char length, unsigned char *buf) 94 { 95 struct i2c_msg msgs[] = { 96 {/* setup read ptr */ 97 .addr = client->addr, 98 .len = 1, 99 .buf = ®, 100 }, 101 { 102 .addr = client->addr, 103 .flags = I2C_M_RD, 104 .len = length, 105 .buf = buf 106 }, 107 }; 108 109 if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { 110 dev_err(&client->dev, "%s: read error\n", __func__); 111 return -EIO; 112 } 113 114 return 0; 115 } 116 117 static int pcf8563_write_block_data(struct i2c_client *client, 118 unsigned char reg, unsigned char length, 119 unsigned char *buf) 120 { 121 int i, err; 122 123 for (i = 0; i < length; i++) { 124 unsigned char data[2] = { reg + i, buf[i] }; 125 126 err = i2c_master_send(client, data, sizeof(data)); 127 if (err != sizeof(data)) { 128 dev_err(&client->dev, 129 "%s: err=%d addr=%02x, data=%02x\n", 130 __func__, err, data[0], data[1]); 131 return -EIO; 132 } 133 } 134 135 return 0; 136 } 137 138 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) 139 { 140 unsigned char buf; 141 int err; 142 143 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); 144 if (err < 0) 145 return err; 146 147 if (on) 148 buf |= PCF8563_BIT_AIE; 149 else 150 buf &= ~PCF8563_BIT_AIE; 151 152 buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); 153 154 err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); 155 if (err < 0) { 156 dev_err(&client->dev, "%s: write error\n", __func__); 157 return -EIO; 158 } 159 160 return 0; 161 } 162 163 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, 164 unsigned char *pen) 165 { 166 unsigned char buf; 167 int err; 168 169 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); 170 if (err) 171 return err; 172 173 if (en) 174 *en = !!(buf & PCF8563_BIT_AIE); 175 if (pen) 176 *pen = !!(buf & PCF8563_BIT_AF); 177 178 return 0; 179 } 180 181 static irqreturn_t pcf8563_irq(int irq, void *dev_id) 182 { 183 struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); 184 int err; 185 char pending; 186 187 err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); 188 if (err) 189 return IRQ_NONE; 190 191 if (pending) { 192 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); 193 pcf8563_set_alarm_mode(pcf8563->client, 1); 194 return IRQ_HANDLED; 195 } 196 197 return IRQ_NONE; 198 } 199 200 /* 201 * In the routines that deal directly with the pcf8563 hardware, we use 202 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. 203 */ 204 static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) 205 { 206 struct pcf8563 *pcf8563 = i2c_get_clientdata(client); 207 unsigned char buf[9]; 208 int err; 209 210 err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); 211 if (err) 212 return err; 213 214 if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { 215 pcf8563->voltage_low = 1; 216 dev_err(&client->dev, 217 "low voltage detected, date/time is not reliable.\n"); 218 return -EINVAL; 219 } 220 221 dev_dbg(&client->dev, 222 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " 223 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", 224 __func__, 225 buf[0], buf[1], buf[2], buf[3], 226 buf[4], buf[5], buf[6], buf[7], 227 buf[8]); 228 229 230 tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); 231 tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); 232 tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ 233 tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); 234 tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; 235 tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ 236 tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); 237 if (tm->tm_year < 70) 238 tm->tm_year += 100; /* assume we are in 1970...2069 */ 239 /* detect the polarity heuristically. see note above. */ 240 pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? 241 (tm->tm_year >= 100) : (tm->tm_year < 100); 242 243 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 244 "mday=%d, mon=%d, year=%d, wday=%d\n", 245 __func__, 246 tm->tm_sec, tm->tm_min, tm->tm_hour, 247 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 248 249 return 0; 250 } 251 252 static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) 253 { 254 struct pcf8563 *pcf8563 = i2c_get_clientdata(client); 255 unsigned char buf[9]; 256 257 dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " 258 "mday=%d, mon=%d, year=%d, wday=%d\n", 259 __func__, 260 tm->tm_sec, tm->tm_min, tm->tm_hour, 261 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 262 263 /* hours, minutes and seconds */ 264 buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); 265 buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); 266 buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); 267 268 buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); 269 270 /* month, 1 - 12 */ 271 buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); 272 273 /* year and century */ 274 buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); 275 if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) 276 buf[PCF8563_REG_MO] |= PCF8563_MO_C; 277 278 buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; 279 280 return pcf8563_write_block_data(client, PCF8563_REG_SC, 281 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); 282 } 283 284 #ifdef CONFIG_RTC_INTF_DEV 285 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 286 { 287 struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); 288 struct rtc_time tm; 289 290 switch (cmd) { 291 case RTC_VL_READ: 292 if (pcf8563->voltage_low) 293 dev_info(dev, "low voltage detected, date/time is not reliable.\n"); 294 295 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, 296 sizeof(int))) 297 return -EFAULT; 298 return 0; 299 case RTC_VL_CLR: 300 /* 301 * Clear the VL bit in the seconds register in case 302 * the time has not been set already (which would 303 * have cleared it). This does not really matter 304 * because of the cached voltage_low value but do it 305 * anyway for consistency. 306 */ 307 if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) 308 pcf8563_set_datetime(to_i2c_client(dev), &tm); 309 310 /* Clear the cached value. */ 311 pcf8563->voltage_low = 0; 312 313 return 0; 314 default: 315 return -ENOIOCTLCMD; 316 } 317 } 318 #else 319 #define pcf8563_rtc_ioctl NULL 320 #endif 321 322 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) 323 { 324 return pcf8563_get_datetime(to_i2c_client(dev), tm); 325 } 326 327 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) 328 { 329 return pcf8563_set_datetime(to_i2c_client(dev), tm); 330 } 331 332 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) 333 { 334 struct i2c_client *client = to_i2c_client(dev); 335 unsigned char buf[4]; 336 int err; 337 338 err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); 339 if (err) 340 return err; 341 342 dev_dbg(&client->dev, 343 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", 344 __func__, buf[0], buf[1], buf[2], buf[3]); 345 346 tm->time.tm_min = bcd2bin(buf[0] & 0x7F); 347 tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); 348 tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); 349 tm->time.tm_wday = bcd2bin(buf[3] & 0x7); 350 tm->time.tm_mon = -1; 351 tm->time.tm_year = -1; 352 tm->time.tm_yday = -1; 353 tm->time.tm_isdst = -1; 354 355 err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); 356 if (err < 0) 357 return err; 358 359 dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," 360 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, 361 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, 362 tm->enabled, tm->pending); 363 364 return 0; 365 } 366 367 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) 368 { 369 struct i2c_client *client = to_i2c_client(dev); 370 unsigned char buf[4]; 371 int err; 372 373 /* The alarm has no seconds, round up to nearest minute */ 374 if (tm->time.tm_sec) { 375 time64_t alarm_time = rtc_tm_to_time64(&tm->time); 376 377 alarm_time += 60 - tm->time.tm_sec; 378 rtc_time64_to_tm(alarm_time, &tm->time); 379 } 380 381 dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " 382 "enabled=%d pending=%d\n", __func__, 383 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, 384 tm->time.tm_mday, tm->enabled, tm->pending); 385 386 buf[0] = bin2bcd(tm->time.tm_min); 387 buf[1] = bin2bcd(tm->time.tm_hour); 388 buf[2] = bin2bcd(tm->time.tm_mday); 389 buf[3] = tm->time.tm_wday & 0x07; 390 391 err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); 392 if (err) 393 return err; 394 395 return pcf8563_set_alarm_mode(client, 1); 396 } 397 398 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) 399 { 400 dev_dbg(dev, "%s: en=%d\n", __func__, enabled); 401 return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); 402 } 403 404 #ifdef CONFIG_COMMON_CLK 405 /* 406 * Handling of the clkout 407 */ 408 409 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw) 410 411 static int clkout_rates[] = { 412 32768, 413 1024, 414 32, 415 1, 416 }; 417 418 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw, 419 unsigned long parent_rate) 420 { 421 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 422 struct i2c_client *client = pcf8563->client; 423 unsigned char buf; 424 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 425 426 if (ret < 0) 427 return 0; 428 429 buf &= PCF8563_REG_CLKO_F_MASK; 430 return clkout_rates[ret]; 431 } 432 433 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, 434 unsigned long *prate) 435 { 436 int i; 437 438 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) 439 if (clkout_rates[i] <= rate) 440 return clkout_rates[i]; 441 442 return 0; 443 } 444 445 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, 446 unsigned long parent_rate) 447 { 448 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 449 struct i2c_client *client = pcf8563->client; 450 unsigned char buf; 451 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 452 int i; 453 454 if (ret < 0) 455 return ret; 456 457 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) 458 if (clkout_rates[i] == rate) { 459 buf &= ~PCF8563_REG_CLKO_F_MASK; 460 buf |= i; 461 ret = pcf8563_write_block_data(client, 462 PCF8563_REG_CLKO, 1, 463 &buf); 464 return ret; 465 } 466 467 return -EINVAL; 468 } 469 470 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable) 471 { 472 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 473 struct i2c_client *client = pcf8563->client; 474 unsigned char buf; 475 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 476 477 if (ret < 0) 478 return ret; 479 480 if (enable) 481 buf |= PCF8563_REG_CLKO_FE; 482 else 483 buf &= ~PCF8563_REG_CLKO_FE; 484 485 ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); 486 return ret; 487 } 488 489 static int pcf8563_clkout_prepare(struct clk_hw *hw) 490 { 491 return pcf8563_clkout_control(hw, 1); 492 } 493 494 static void pcf8563_clkout_unprepare(struct clk_hw *hw) 495 { 496 pcf8563_clkout_control(hw, 0); 497 } 498 499 static int pcf8563_clkout_is_prepared(struct clk_hw *hw) 500 { 501 struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); 502 struct i2c_client *client = pcf8563->client; 503 unsigned char buf; 504 int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); 505 506 if (ret < 0) 507 return ret; 508 509 return !!(buf & PCF8563_REG_CLKO_FE); 510 } 511 512 static const struct clk_ops pcf8563_clkout_ops = { 513 .prepare = pcf8563_clkout_prepare, 514 .unprepare = pcf8563_clkout_unprepare, 515 .is_prepared = pcf8563_clkout_is_prepared, 516 .recalc_rate = pcf8563_clkout_recalc_rate, 517 .round_rate = pcf8563_clkout_round_rate, 518 .set_rate = pcf8563_clkout_set_rate, 519 }; 520 521 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563) 522 { 523 struct i2c_client *client = pcf8563->client; 524 struct device_node *node = client->dev.of_node; 525 struct clk *clk; 526 struct clk_init_data init; 527 int ret; 528 unsigned char buf; 529 530 /* disable the clkout output */ 531 buf = 0; 532 ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); 533 if (ret < 0) 534 return ERR_PTR(ret); 535 536 init.name = "pcf8563-clkout"; 537 init.ops = &pcf8563_clkout_ops; 538 init.flags = CLK_IS_ROOT; 539 init.parent_names = NULL; 540 init.num_parents = 0; 541 pcf8563->clkout_hw.init = &init; 542 543 /* optional override of the clockname */ 544 of_property_read_string(node, "clock-output-names", &init.name); 545 546 /* register the clock */ 547 clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw); 548 549 if (!IS_ERR(clk)) 550 of_clk_add_provider(node, of_clk_src_simple_get, clk); 551 552 return clk; 553 } 554 #endif 555 556 static const struct rtc_class_ops pcf8563_rtc_ops = { 557 .ioctl = pcf8563_rtc_ioctl, 558 .read_time = pcf8563_rtc_read_time, 559 .set_time = pcf8563_rtc_set_time, 560 .read_alarm = pcf8563_rtc_read_alarm, 561 .set_alarm = pcf8563_rtc_set_alarm, 562 .alarm_irq_enable = pcf8563_irq_enable, 563 }; 564 565 static int pcf8563_probe(struct i2c_client *client, 566 const struct i2c_device_id *id) 567 { 568 struct pcf8563 *pcf8563; 569 int err; 570 unsigned char buf; 571 unsigned char alm_pending; 572 573 dev_dbg(&client->dev, "%s\n", __func__); 574 575 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 576 return -ENODEV; 577 578 pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), 579 GFP_KERNEL); 580 if (!pcf8563) 581 return -ENOMEM; 582 583 dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); 584 585 i2c_set_clientdata(client, pcf8563); 586 pcf8563->client = client; 587 device_set_wakeup_capable(&client->dev, 1); 588 589 /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ 590 buf = PCF8563_TMRC_1_60; 591 err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); 592 if (err < 0) { 593 dev_err(&client->dev, "%s: write error\n", __func__); 594 return err; 595 } 596 597 err = pcf8563_get_alarm_mode(client, NULL, &alm_pending); 598 if (err) { 599 dev_err(&client->dev, "%s: read error\n", __func__); 600 return err; 601 } 602 if (alm_pending) 603 pcf8563_set_alarm_mode(client, 0); 604 605 pcf8563->rtc = devm_rtc_device_register(&client->dev, 606 pcf8563_driver.driver.name, 607 &pcf8563_rtc_ops, THIS_MODULE); 608 609 if (IS_ERR(pcf8563->rtc)) 610 return PTR_ERR(pcf8563->rtc); 611 612 if (client->irq > 0) { 613 err = devm_request_threaded_irq(&client->dev, client->irq, 614 NULL, pcf8563_irq, 615 IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, 616 pcf8563->rtc->name, client); 617 if (err) { 618 dev_err(&client->dev, "unable to request IRQ %d\n", 619 client->irq); 620 return err; 621 } 622 623 } 624 625 #ifdef CONFIG_COMMON_CLK 626 /* register clk in common clk framework */ 627 pcf8563_clkout_register_clk(pcf8563); 628 #endif 629 630 /* the pcf8563 alarm only supports a minute accuracy */ 631 pcf8563->rtc->uie_unsupported = 1; 632 633 return 0; 634 } 635 636 static const struct i2c_device_id pcf8563_id[] = { 637 { "pcf8563", 0 }, 638 { "rtc8564", 0 }, 639 { } 640 }; 641 MODULE_DEVICE_TABLE(i2c, pcf8563_id); 642 643 #ifdef CONFIG_OF 644 static const struct of_device_id pcf8563_of_match[] = { 645 { .compatible = "nxp,pcf8563" }, 646 {} 647 }; 648 MODULE_DEVICE_TABLE(of, pcf8563_of_match); 649 #endif 650 651 static struct i2c_driver pcf8563_driver = { 652 .driver = { 653 .name = "rtc-pcf8563", 654 .of_match_table = of_match_ptr(pcf8563_of_match), 655 }, 656 .probe = pcf8563_probe, 657 .id_table = pcf8563_id, 658 }; 659 660 module_i2c_driver(pcf8563_driver); 661 662 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 663 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); 664 MODULE_LICENSE("GPL"); 665 MODULE_VERSION(DRV_VERSION); 666