1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Real Time Clock driver for AB-RTCMC-32.768kHz-EOZ9 chip. 4 * Copyright (C) 2019 Orolia 5 * 6 */ 7 8 #include <linux/module.h> 9 #include <linux/rtc.h> 10 #include <linux/i2c.h> 11 #include <linux/bcd.h> 12 #include <linux/of.h> 13 #include <linux/regmap.h> 14 #include <linux/bitfield.h> 15 #include <linux/hwmon.h> 16 #include <linux/hwmon-sysfs.h> 17 18 #define ABEOZ9_REG_CTRL1 0x00 19 #define ABEOZ9_REG_CTRL1_MASK GENMASK(7, 0) 20 #define ABEOZ9_REG_CTRL1_WE BIT(0) 21 #define ABEOZ9_REG_CTRL1_TE BIT(1) 22 #define ABEOZ9_REG_CTRL1_TAR BIT(2) 23 #define ABEOZ9_REG_CTRL1_EERE BIT(3) 24 #define ABEOZ9_REG_CTRL1_SRON BIT(4) 25 #define ABEOZ9_REG_CTRL1_TD0 BIT(5) 26 #define ABEOZ9_REG_CTRL1_TD1 BIT(6) 27 #define ABEOZ9_REG_CTRL1_CLKINT BIT(7) 28 29 #define ABEOZ9_REG_CTRL_INT 0x01 30 #define ABEOZ9_REG_CTRL_INT_AIE BIT(0) 31 #define ABEOZ9_REG_CTRL_INT_TIE BIT(1) 32 #define ABEOZ9_REG_CTRL_INT_V1IE BIT(2) 33 #define ABEOZ9_REG_CTRL_INT_V2IE BIT(3) 34 #define ABEOZ9_REG_CTRL_INT_SRIE BIT(4) 35 36 #define ABEOZ9_REG_CTRL_INT_FLAG 0x02 37 #define ABEOZ9_REG_CTRL_INT_FLAG_AF BIT(0) 38 #define ABEOZ9_REG_CTRL_INT_FLAG_TF BIT(1) 39 #define ABEOZ9_REG_CTRL_INT_FLAG_V1IF BIT(2) 40 #define ABEOZ9_REG_CTRL_INT_FLAG_V2IF BIT(3) 41 #define ABEOZ9_REG_CTRL_INT_FLAG_SRF BIT(4) 42 43 #define ABEOZ9_REG_CTRL_STATUS 0x03 44 #define ABEOZ9_REG_CTRL_STATUS_V1F BIT(2) 45 #define ABEOZ9_REG_CTRL_STATUS_V2F BIT(3) 46 #define ABEOZ9_REG_CTRL_STATUS_SR BIT(4) 47 #define ABEOZ9_REG_CTRL_STATUS_PON BIT(5) 48 #define ABEOZ9_REG_CTRL_STATUS_EEBUSY BIT(7) 49 50 #define ABEOZ9_REG_SEC 0x08 51 #define ABEOZ9_REG_MIN 0x09 52 #define ABEOZ9_REG_HOURS 0x0A 53 #define ABEOZ9_HOURS_PM BIT(6) 54 #define ABEOZ9_REG_DAYS 0x0B 55 #define ABEOZ9_REG_WEEKDAYS 0x0C 56 #define ABEOZ9_REG_MONTHS 0x0D 57 #define ABEOZ9_REG_YEARS 0x0E 58 59 #define ABEOZ9_SEC_LEN 7 60 61 #define ABEOZ9_REG_ALARM_SEC 0x10 62 #define ABEOZ9_BIT_ALARM_SEC GENMASK(6, 0) 63 #define ABEOZ9_REG_ALARM_MIN 0x11 64 #define ABEOZ9_BIT_ALARM_MIN GENMASK(6, 0) 65 #define ABEOZ9_REG_ALARM_HOURS 0x12 66 #define ABEOZ9_BIT_ALARM_HOURS_PM BIT(5) 67 #define ABEOZ9_BIT_ALARM_HOURS GENMASK(5, 0) 68 #define ABEOZ9_REG_ALARM_DAYS 0x13 69 #define ABEOZ9_BIT_ALARM_DAYS GENMASK(5, 0) 70 #define ABEOZ9_REG_ALARM_WEEKDAYS 0x14 71 #define ABEOZ9_BIT_ALARM_WEEKDAYS GENMASK(2, 0) 72 #define ABEOZ9_REG_ALARM_MONTHS 0x15 73 #define ABEOZ9_BIT_ALARM_MONTHS GENMASK(4, 0) 74 #define ABEOZ9_REG_ALARM_YEARS 0x16 75 76 #define ABEOZ9_ALARM_LEN 7 77 #define ABEOZ9_BIT_ALARM_AE BIT(7) 78 79 #define ABEOZ9_REG_REG_TEMP 0x20 80 #define ABEOZ953_TEMP_MAX 120 81 #define ABEOZ953_TEMP_MIN -60 82 83 #define ABEOZ9_REG_EEPROM 0x30 84 #define ABEOZ9_REG_EEPROM_MASK GENMASK(8, 0) 85 #define ABEOZ9_REG_EEPROM_THP BIT(0) 86 #define ABEOZ9_REG_EEPROM_THE BIT(1) 87 #define ABEOZ9_REG_EEPROM_FD0 BIT(2) 88 #define ABEOZ9_REG_EEPROM_FD1 BIT(3) 89 #define ABEOZ9_REG_EEPROM_R1K BIT(4) 90 #define ABEOZ9_REG_EEPROM_R5K BIT(5) 91 #define ABEOZ9_REG_EEPROM_R20K BIT(6) 92 #define ABEOZ9_REG_EEPROM_R80K BIT(7) 93 94 struct abeoz9_rtc_data { 95 struct rtc_device *rtc; 96 struct regmap *regmap; 97 struct device *hwmon_dev; 98 }; 99 100 static int abeoz9_check_validity(struct device *dev) 101 { 102 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 103 struct regmap *regmap = data->regmap; 104 int ret; 105 int val; 106 107 ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val); 108 if (ret < 0) { 109 dev_err(dev, 110 "unable to get CTRL_STATUS register (%d)\n", ret); 111 return ret; 112 } 113 114 if (val & ABEOZ9_REG_CTRL_STATUS_PON) { 115 dev_warn(dev, "power-on reset detected, date is invalid\n"); 116 return -EINVAL; 117 } 118 119 if (val & ABEOZ9_REG_CTRL_STATUS_V1F) { 120 dev_warn(dev, 121 "voltage drops below VLOW1 threshold, date is invalid\n"); 122 return -EINVAL; 123 } 124 125 if ((val & ABEOZ9_REG_CTRL_STATUS_V2F)) { 126 dev_warn(dev, 127 "voltage drops below VLOW2 threshold, date is invalid\n"); 128 return -EINVAL; 129 } 130 131 return 0; 132 } 133 134 static int abeoz9_reset_validity(struct regmap *regmap) 135 { 136 return regmap_update_bits(regmap, ABEOZ9_REG_CTRL_STATUS, 137 ABEOZ9_REG_CTRL_STATUS_V1F | 138 ABEOZ9_REG_CTRL_STATUS_V2F | 139 ABEOZ9_REG_CTRL_STATUS_PON, 140 0); 141 } 142 143 static int abeoz9_rtc_get_time(struct device *dev, struct rtc_time *tm) 144 { 145 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 146 u8 regs[ABEOZ9_SEC_LEN]; 147 int ret; 148 149 ret = abeoz9_check_validity(dev); 150 if (ret) 151 return ret; 152 153 ret = regmap_bulk_read(data->regmap, ABEOZ9_REG_SEC, 154 regs, 155 sizeof(regs)); 156 if (ret) { 157 dev_err(dev, "reading RTC time failed (%d)\n", ret); 158 return ret; 159 } 160 161 tm->tm_sec = bcd2bin(regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] & 0x7F); 162 tm->tm_min = bcd2bin(regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] & 0x7F); 163 164 if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM) { 165 tm->tm_hour = 166 bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & 0x1f); 167 if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM) 168 tm->tm_hour += 12; 169 } else { 170 tm->tm_hour = bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC]); 171 } 172 173 tm->tm_mday = bcd2bin(regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC]); 174 tm->tm_wday = bcd2bin(regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC]); 175 tm->tm_mon = bcd2bin(regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC]) - 1; 176 tm->tm_year = bcd2bin(regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC]) + 100; 177 178 return ret; 179 } 180 181 static int abeoz9_rtc_set_time(struct device *dev, struct rtc_time *tm) 182 { 183 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 184 struct regmap *regmap = data->regmap; 185 u8 regs[ABEOZ9_SEC_LEN]; 186 int ret; 187 188 regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_sec); 189 regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_min); 190 regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_hour); 191 regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mday); 192 regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_wday); 193 regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_mon + 1); 194 regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC] = bin2bcd(tm->tm_year - 100); 195 196 ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_SEC, 197 regs, 198 sizeof(regs)); 199 200 if (ret) { 201 dev_err(dev, "set RTC time failed (%d)\n", ret); 202 return ret; 203 } 204 205 return abeoz9_reset_validity(regmap); 206 } 207 208 static int abeoz9_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 209 { 210 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 211 struct regmap *regmap = data->regmap; 212 u8 regs[ABEOZ9_ALARM_LEN]; 213 u8 val[2]; 214 int ret; 215 216 ret = abeoz9_check_validity(dev); 217 if (ret) 218 return ret; 219 220 ret = regmap_bulk_read(regmap, ABEOZ9_REG_CTRL_INT, val, sizeof(val)); 221 if (ret) 222 return ret; 223 224 alarm->enabled = val[0] & ABEOZ9_REG_CTRL_INT_AIE; 225 alarm->pending = val[1] & ABEOZ9_REG_CTRL_INT_FLAG_AF; 226 227 ret = regmap_bulk_read(regmap, ABEOZ9_REG_ALARM_SEC, regs, sizeof(regs)); 228 if (ret) 229 return ret; 230 231 alarm->time.tm_sec = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_SEC, regs[0])); 232 alarm->time.tm_min = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_MIN, regs[1])); 233 alarm->time.tm_hour = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_HOURS, regs[2])); 234 235 alarm->time.tm_mday = bcd2bin(FIELD_GET(ABEOZ9_BIT_ALARM_DAYS, regs[3])); 236 237 return 0; 238 } 239 240 static int abeoz9_rtc_alarm_irq_enable(struct device *dev, u32 enable) 241 { 242 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 243 244 return regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT, 245 ABEOZ9_REG_CTRL_INT_AIE, 246 FIELD_PREP(ABEOZ9_REG_CTRL_INT_AIE, enable)); 247 } 248 249 static int abeoz9_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 250 { 251 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 252 u8 regs[ABEOZ9_ALARM_LEN] = {0}; 253 int ret; 254 255 ret = regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, 256 ABEOZ9_REG_CTRL_INT_FLAG_AF, 0); 257 if (ret) 258 return ret; 259 260 regs[0] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_SEC, 261 bin2bcd(alarm->time.tm_sec)); 262 regs[1] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_MIN, 263 bin2bcd(alarm->time.tm_min)); 264 regs[2] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_HOURS, 265 bin2bcd(alarm->time.tm_hour)); 266 regs[3] = ABEOZ9_BIT_ALARM_AE | FIELD_PREP(ABEOZ9_BIT_ALARM_DAYS, 267 bin2bcd(alarm->time.tm_mday)); 268 269 ret = regmap_bulk_write(data->regmap, ABEOZ9_REG_ALARM_SEC, regs, 270 sizeof(regs)); 271 if (ret) 272 return ret; 273 274 return abeoz9_rtc_alarm_irq_enable(dev, alarm->enabled); 275 } 276 277 static irqreturn_t abeoz9_rtc_irq(int irq, void *dev) 278 { 279 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 280 unsigned int val; 281 int ret; 282 283 ret = regmap_read(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, &val); 284 if (ret) 285 return IRQ_NONE; 286 287 if (!FIELD_GET(ABEOZ9_REG_CTRL_INT_FLAG_AF, val)) 288 return IRQ_NONE; 289 290 regmap_update_bits(data->regmap, ABEOZ9_REG_CTRL_INT_FLAG, 291 ABEOZ9_REG_CTRL_INT_FLAG_AF, 0); 292 293 rtc_update_irq(data->rtc, 1, RTC_IRQF | RTC_AF); 294 295 return IRQ_HANDLED; 296 } 297 298 static int abeoz9_trickle_parse_dt(struct device_node *node) 299 { 300 u32 ohms = 0; 301 302 if (of_property_read_u32(node, "trickle-resistor-ohms", &ohms)) 303 return 0; 304 305 switch (ohms) { 306 case 1000: 307 return ABEOZ9_REG_EEPROM_R1K; 308 case 5000: 309 return ABEOZ9_REG_EEPROM_R5K; 310 case 20000: 311 return ABEOZ9_REG_EEPROM_R20K; 312 case 80000: 313 return ABEOZ9_REG_EEPROM_R80K; 314 default: 315 return 0; 316 } 317 } 318 319 static int abeoz9_rtc_setup(struct device *dev, struct device_node *node) 320 { 321 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 322 struct regmap *regmap = data->regmap; 323 int ret; 324 325 /* Enable Self Recovery, Clock for Watch and EEPROM refresh functions */ 326 ret = regmap_update_bits(regmap, ABEOZ9_REG_CTRL1, 327 ABEOZ9_REG_CTRL1_MASK, 328 ABEOZ9_REG_CTRL1_WE | 329 ABEOZ9_REG_CTRL1_EERE | 330 ABEOZ9_REG_CTRL1_SRON); 331 if (ret < 0) { 332 dev_err(dev, "unable to set CTRL_1 register (%d)\n", ret); 333 return ret; 334 } 335 336 ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT, 0); 337 if (ret < 0) { 338 dev_err(dev, 339 "unable to set control CTRL_INT register (%d)\n", 340 ret); 341 return ret; 342 } 343 344 ret = regmap_write(regmap, ABEOZ9_REG_CTRL_INT_FLAG, 0); 345 if (ret < 0) { 346 dev_err(dev, 347 "unable to set control CTRL_INT_FLAG register (%d)\n", 348 ret); 349 return ret; 350 } 351 352 ret = abeoz9_trickle_parse_dt(node); 353 354 /* Enable built-in termometer */ 355 ret |= ABEOZ9_REG_EEPROM_THE; 356 357 ret = regmap_update_bits(regmap, ABEOZ9_REG_EEPROM, 358 ABEOZ9_REG_EEPROM_MASK, 359 ret); 360 if (ret < 0) { 361 dev_err(dev, "unable to set EEPROM register (%d)\n", ret); 362 return ret; 363 } 364 365 return ret; 366 } 367 368 static const struct rtc_class_ops rtc_ops = { 369 .read_time = abeoz9_rtc_get_time, 370 .set_time = abeoz9_rtc_set_time, 371 .read_alarm = abeoz9_rtc_read_alarm, 372 .set_alarm = abeoz9_rtc_set_alarm, 373 .alarm_irq_enable = abeoz9_rtc_alarm_irq_enable, 374 }; 375 376 static const struct regmap_config abeoz9_rtc_regmap_config = { 377 .reg_bits = 8, 378 .val_bits = 8, 379 .max_register = 0x3f, 380 }; 381 382 #if IS_REACHABLE(CONFIG_HWMON) 383 384 static int abeoz9z3_temp_read(struct device *dev, 385 enum hwmon_sensor_types type, 386 u32 attr, int channel, long *temp) 387 { 388 struct abeoz9_rtc_data *data = dev_get_drvdata(dev); 389 struct regmap *regmap = data->regmap; 390 int ret; 391 unsigned int val; 392 393 ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val); 394 if (ret < 0) 395 return ret; 396 397 switch (attr) { 398 case hwmon_temp_input: 399 ret = regmap_read(regmap, ABEOZ9_REG_REG_TEMP, &val); 400 if (ret < 0) 401 return ret; 402 *temp = 1000 * (val + ABEOZ953_TEMP_MIN); 403 return 0; 404 case hwmon_temp_max: 405 *temp = 1000 * ABEOZ953_TEMP_MAX; 406 return 0; 407 case hwmon_temp_min: 408 *temp = 1000 * ABEOZ953_TEMP_MIN; 409 return 0; 410 default: 411 return -EOPNOTSUPP; 412 } 413 } 414 415 static umode_t abeoz9_is_visible(const void *data, 416 enum hwmon_sensor_types type, 417 u32 attr, int channel) 418 { 419 switch (attr) { 420 case hwmon_temp_input: 421 case hwmon_temp_max: 422 case hwmon_temp_min: 423 return 0444; 424 default: 425 return 0; 426 } 427 } 428 429 static const struct hwmon_channel_info * const abeoz9_info[] = { 430 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), 431 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN), 432 NULL 433 }; 434 435 static const struct hwmon_ops abeoz9_hwmon_ops = { 436 .is_visible = abeoz9_is_visible, 437 .read = abeoz9z3_temp_read, 438 }; 439 440 static const struct hwmon_chip_info abeoz9_chip_info = { 441 .ops = &abeoz9_hwmon_ops, 442 .info = abeoz9_info, 443 }; 444 445 static void abeoz9_hwmon_register(struct device *dev, 446 struct abeoz9_rtc_data *data) 447 { 448 data->hwmon_dev = 449 devm_hwmon_device_register_with_info(dev, 450 "abeoz9", 451 data, 452 &abeoz9_chip_info, 453 NULL); 454 if (IS_ERR(data->hwmon_dev)) { 455 dev_warn(dev, "unable to register hwmon device %ld\n", 456 PTR_ERR(data->hwmon_dev)); 457 } 458 } 459 460 #else 461 462 static void abeoz9_hwmon_register(struct device *dev, 463 struct abeoz9_rtc_data *data) 464 { 465 } 466 467 #endif 468 469 static int abeoz9_probe(struct i2c_client *client) 470 { 471 struct abeoz9_rtc_data *data = NULL; 472 struct device *dev = &client->dev; 473 struct regmap *regmap; 474 int ret; 475 476 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 477 I2C_FUNC_SMBUS_BYTE_DATA | 478 I2C_FUNC_SMBUS_I2C_BLOCK)) 479 return -ENODEV; 480 481 regmap = devm_regmap_init_i2c(client, &abeoz9_rtc_regmap_config); 482 if (IS_ERR(regmap)) { 483 ret = PTR_ERR(regmap); 484 dev_err(dev, "regmap allocation failed: %d\n", ret); 485 return ret; 486 } 487 488 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 489 if (!data) 490 return -ENOMEM; 491 492 data->regmap = regmap; 493 dev_set_drvdata(dev, data); 494 495 ret = abeoz9_rtc_setup(dev, client->dev.of_node); 496 if (ret) 497 return ret; 498 499 data->rtc = devm_rtc_allocate_device(dev); 500 ret = PTR_ERR_OR_ZERO(data->rtc); 501 if (ret) 502 return ret; 503 504 data->rtc->ops = &rtc_ops; 505 data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; 506 data->rtc->range_max = RTC_TIMESTAMP_END_2099; 507 clear_bit(RTC_FEATURE_ALARM, data->rtc->features); 508 509 if (client->irq > 0) { 510 unsigned long irqflags = IRQF_TRIGGER_LOW; 511 512 if (dev_fwnode(&client->dev)) 513 irqflags = 0; 514 515 ret = devm_request_threaded_irq(dev, client->irq, NULL, 516 abeoz9_rtc_irq, 517 irqflags | IRQF_ONESHOT, 518 dev_name(dev), dev); 519 if (ret) { 520 dev_err(dev, "failed to request alarm irq\n"); 521 return ret; 522 } 523 } else { 524 clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, data->rtc->features); 525 } 526 527 if (client->irq > 0 || device_property_read_bool(dev, "wakeup-source")) { 528 ret = device_init_wakeup(dev, true); 529 set_bit(RTC_FEATURE_ALARM, data->rtc->features); 530 } 531 532 ret = devm_rtc_register_device(data->rtc); 533 if (ret) 534 return ret; 535 536 abeoz9_hwmon_register(dev, data); 537 return 0; 538 } 539 540 #ifdef CONFIG_OF 541 static const struct of_device_id abeoz9_dt_match[] = { 542 { .compatible = "abracon,abeoz9" }, 543 { }, 544 }; 545 MODULE_DEVICE_TABLE(of, abeoz9_dt_match); 546 #endif 547 548 static const struct i2c_device_id abeoz9_id[] = { 549 { "abeoz9" }, 550 { } 551 }; 552 553 static struct i2c_driver abeoz9_driver = { 554 .driver = { 555 .name = "rtc-ab-eoz9", 556 .of_match_table = of_match_ptr(abeoz9_dt_match), 557 }, 558 .probe = abeoz9_probe, 559 .id_table = abeoz9_id, 560 }; 561 562 module_i2c_driver(abeoz9_driver); 563 564 MODULE_AUTHOR("Artem Panfilov <panfilov.artyom@gmail.com>"); 565 MODULE_DESCRIPTION("Abracon AB-RTCMC-32.768kHz-EOZ9 RTC driver"); 566 MODULE_LICENSE("GPL"); 567