1 /* 2 * A driver for the I2C members of the Abracon AB x8xx RTC family, 3 * and compatible: AB 1805 and AB 0805 4 * 5 * Copyright 2014-2015 Macq S.A. 6 * 7 * Author: Philippe De Muyter <phdm@macqel.be> 8 * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 * 14 */ 15 16 #include <linux/bcd.h> 17 #include <linux/i2c.h> 18 #include <linux/module.h> 19 #include <linux/rtc.h> 20 #include <linux/watchdog.h> 21 22 #define ABX8XX_REG_HTH 0x00 23 #define ABX8XX_REG_SC 0x01 24 #define ABX8XX_REG_MN 0x02 25 #define ABX8XX_REG_HR 0x03 26 #define ABX8XX_REG_DA 0x04 27 #define ABX8XX_REG_MO 0x05 28 #define ABX8XX_REG_YR 0x06 29 #define ABX8XX_REG_WD 0x07 30 31 #define ABX8XX_REG_AHTH 0x08 32 #define ABX8XX_REG_ASC 0x09 33 #define ABX8XX_REG_AMN 0x0a 34 #define ABX8XX_REG_AHR 0x0b 35 #define ABX8XX_REG_ADA 0x0c 36 #define ABX8XX_REG_AMO 0x0d 37 #define ABX8XX_REG_AWD 0x0e 38 39 #define ABX8XX_REG_STATUS 0x0f 40 #define ABX8XX_STATUS_AF BIT(2) 41 #define ABX8XX_STATUS_BLF BIT(4) 42 #define ABX8XX_STATUS_WDT BIT(6) 43 44 #define ABX8XX_REG_CTRL1 0x10 45 #define ABX8XX_CTRL_WRITE BIT(0) 46 #define ABX8XX_CTRL_ARST BIT(2) 47 #define ABX8XX_CTRL_12_24 BIT(6) 48 49 #define ABX8XX_REG_IRQ 0x12 50 #define ABX8XX_IRQ_AIE BIT(2) 51 #define ABX8XX_IRQ_IM_1_4 (0x3 << 5) 52 53 #define ABX8XX_REG_CD_TIMER_CTL 0x18 54 55 #define ABX8XX_REG_OSC 0x1c 56 #define ABX8XX_OSC_FOS BIT(3) 57 #define ABX8XX_OSC_BOS BIT(4) 58 #define ABX8XX_OSC_ACAL_512 BIT(5) 59 #define ABX8XX_OSC_ACAL_1024 BIT(6) 60 61 #define ABX8XX_OSC_OSEL BIT(7) 62 63 #define ABX8XX_REG_OSS 0x1d 64 #define ABX8XX_OSS_OF BIT(1) 65 #define ABX8XX_OSS_OMODE BIT(4) 66 67 #define ABX8XX_REG_WDT 0x1b 68 #define ABX8XX_WDT_WDS BIT(7) 69 #define ABX8XX_WDT_BMB_MASK 0x7c 70 #define ABX8XX_WDT_BMB_SHIFT 2 71 #define ABX8XX_WDT_MAX_TIME (ABX8XX_WDT_BMB_MASK >> ABX8XX_WDT_BMB_SHIFT) 72 #define ABX8XX_WDT_WRB_MASK 0x03 73 #define ABX8XX_WDT_WRB_1HZ 0x02 74 75 #define ABX8XX_REG_CFG_KEY 0x1f 76 #define ABX8XX_CFG_KEY_OSC 0xa1 77 #define ABX8XX_CFG_KEY_MISC 0x9d 78 79 #define ABX8XX_REG_ID0 0x28 80 81 #define ABX8XX_REG_TRICKLE 0x20 82 #define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0 83 #define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 84 #define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 85 86 static u8 trickle_resistors[] = {0, 3, 6, 11}; 87 88 enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, 89 AB1801, AB1803, AB1804, AB1805, ABX80X}; 90 91 struct abx80x_cap { 92 u16 pn; 93 bool has_tc; 94 bool has_wdog; 95 }; 96 97 static struct abx80x_cap abx80x_caps[] = { 98 [AB0801] = {.pn = 0x0801}, 99 [AB0803] = {.pn = 0x0803}, 100 [AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true}, 101 [AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true}, 102 [AB1801] = {.pn = 0x1801}, 103 [AB1803] = {.pn = 0x1803}, 104 [AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true}, 105 [AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, 106 [ABX80X] = {.pn = 0} 107 }; 108 109 struct abx80x_priv { 110 struct rtc_device *rtc; 111 struct i2c_client *client; 112 struct watchdog_device wdog; 113 }; 114 115 static int abx80x_is_rc_mode(struct i2c_client *client) 116 { 117 int flags = 0; 118 119 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); 120 if (flags < 0) { 121 dev_err(&client->dev, 122 "Failed to read autocalibration attribute\n"); 123 return flags; 124 } 125 126 return (flags & ABX8XX_OSS_OMODE) ? 1 : 0; 127 } 128 129 static int abx80x_enable_trickle_charger(struct i2c_client *client, 130 u8 trickle_cfg) 131 { 132 int err; 133 134 /* 135 * Write the configuration key register to enable access to the Trickle 136 * register 137 */ 138 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 139 ABX8XX_CFG_KEY_MISC); 140 if (err < 0) { 141 dev_err(&client->dev, "Unable to write configuration key\n"); 142 return -EIO; 143 } 144 145 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE, 146 ABX8XX_TRICKLE_CHARGE_ENABLE | 147 trickle_cfg); 148 if (err < 0) { 149 dev_err(&client->dev, "Unable to write trickle register\n"); 150 return -EIO; 151 } 152 153 return 0; 154 } 155 156 static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm) 157 { 158 struct i2c_client *client = to_i2c_client(dev); 159 unsigned char buf[8]; 160 int err, flags, rc_mode = 0; 161 162 /* Read the Oscillator Failure only in XT mode */ 163 rc_mode = abx80x_is_rc_mode(client); 164 if (rc_mode < 0) 165 return rc_mode; 166 167 if (!rc_mode) { 168 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); 169 if (flags < 0) 170 return flags; 171 172 if (flags & ABX8XX_OSS_OF) { 173 dev_err(dev, "Oscillator failure, data is invalid.\n"); 174 return -EINVAL; 175 } 176 } 177 178 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH, 179 sizeof(buf), buf); 180 if (err < 0) { 181 dev_err(&client->dev, "Unable to read date\n"); 182 return -EIO; 183 } 184 185 tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F); 186 tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F); 187 tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F); 188 tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7; 189 tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F); 190 tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1; 191 tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100; 192 193 return 0; 194 } 195 196 static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm) 197 { 198 struct i2c_client *client = to_i2c_client(dev); 199 unsigned char buf[8]; 200 int err, flags; 201 202 if (tm->tm_year < 100) 203 return -EINVAL; 204 205 buf[ABX8XX_REG_HTH] = 0; 206 buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec); 207 buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min); 208 buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour); 209 buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday); 210 buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1); 211 buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100); 212 buf[ABX8XX_REG_WD] = tm->tm_wday; 213 214 err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH, 215 sizeof(buf), buf); 216 if (err < 0) { 217 dev_err(&client->dev, "Unable to write to date registers\n"); 218 return -EIO; 219 } 220 221 /* Clear the OF bit of Oscillator Status Register */ 222 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); 223 if (flags < 0) 224 return flags; 225 226 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS, 227 flags & ~ABX8XX_OSS_OF); 228 if (err < 0) { 229 dev_err(&client->dev, "Unable to write oscillator status register\n"); 230 return err; 231 } 232 233 return 0; 234 } 235 236 static irqreturn_t abx80x_handle_irq(int irq, void *dev_id) 237 { 238 struct i2c_client *client = dev_id; 239 struct abx80x_priv *priv = i2c_get_clientdata(client); 240 struct rtc_device *rtc = priv->rtc; 241 int status; 242 243 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); 244 if (status < 0) 245 return IRQ_NONE; 246 247 if (status & ABX8XX_STATUS_AF) 248 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF); 249 250 /* 251 * It is unclear if we'll get an interrupt before the external 252 * reset kicks in. 253 */ 254 if (status & ABX8XX_STATUS_WDT) 255 dev_alert(&client->dev, "watchdog timeout interrupt.\n"); 256 257 i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); 258 259 return IRQ_HANDLED; 260 } 261 262 static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) 263 { 264 struct i2c_client *client = to_i2c_client(dev); 265 unsigned char buf[7]; 266 267 int irq_mask, err; 268 269 if (client->irq <= 0) 270 return -EINVAL; 271 272 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC, 273 sizeof(buf), buf); 274 if (err) 275 return err; 276 277 irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ); 278 if (irq_mask < 0) 279 return irq_mask; 280 281 t->time.tm_sec = bcd2bin(buf[0] & 0x7F); 282 t->time.tm_min = bcd2bin(buf[1] & 0x7F); 283 t->time.tm_hour = bcd2bin(buf[2] & 0x3F); 284 t->time.tm_mday = bcd2bin(buf[3] & 0x3F); 285 t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1; 286 t->time.tm_wday = buf[5] & 0x7; 287 288 t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE); 289 t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled; 290 291 return err; 292 } 293 294 static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t) 295 { 296 struct i2c_client *client = to_i2c_client(dev); 297 u8 alarm[6]; 298 int err; 299 300 if (client->irq <= 0) 301 return -EINVAL; 302 303 alarm[0] = 0x0; 304 alarm[1] = bin2bcd(t->time.tm_sec); 305 alarm[2] = bin2bcd(t->time.tm_min); 306 alarm[3] = bin2bcd(t->time.tm_hour); 307 alarm[4] = bin2bcd(t->time.tm_mday); 308 alarm[5] = bin2bcd(t->time.tm_mon + 1); 309 310 err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH, 311 sizeof(alarm), alarm); 312 if (err < 0) { 313 dev_err(&client->dev, "Unable to write alarm registers\n"); 314 return -EIO; 315 } 316 317 if (t->enabled) { 318 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, 319 (ABX8XX_IRQ_IM_1_4 | 320 ABX8XX_IRQ_AIE)); 321 if (err) 322 return err; 323 } 324 325 return 0; 326 } 327 328 static int abx80x_rtc_set_autocalibration(struct device *dev, 329 int autocalibration) 330 { 331 struct i2c_client *client = to_i2c_client(dev); 332 int retval, flags = 0; 333 334 if ((autocalibration != 0) && (autocalibration != 1024) && 335 (autocalibration != 512)) { 336 dev_err(dev, "autocalibration value outside permitted range\n"); 337 return -EINVAL; 338 } 339 340 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); 341 if (flags < 0) 342 return flags; 343 344 if (autocalibration == 0) { 345 flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024); 346 } else if (autocalibration == 1024) { 347 /* 1024 autocalibration is 0x10 */ 348 flags |= ABX8XX_OSC_ACAL_1024; 349 flags &= ~(ABX8XX_OSC_ACAL_512); 350 } else { 351 /* 512 autocalibration is 0x11 */ 352 flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512); 353 } 354 355 /* Unlock write access to Oscillator Control Register */ 356 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 357 ABX8XX_CFG_KEY_OSC); 358 if (retval < 0) { 359 dev_err(dev, "Failed to write CONFIG_KEY register\n"); 360 return retval; 361 } 362 363 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); 364 365 return retval; 366 } 367 368 static int abx80x_rtc_get_autocalibration(struct device *dev) 369 { 370 struct i2c_client *client = to_i2c_client(dev); 371 int flags = 0, autocalibration; 372 373 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); 374 if (flags < 0) 375 return flags; 376 377 if (flags & ABX8XX_OSC_ACAL_512) 378 autocalibration = 512; 379 else if (flags & ABX8XX_OSC_ACAL_1024) 380 autocalibration = 1024; 381 else 382 autocalibration = 0; 383 384 return autocalibration; 385 } 386 387 static ssize_t autocalibration_store(struct device *dev, 388 struct device_attribute *attr, 389 const char *buf, size_t count) 390 { 391 int retval; 392 unsigned long autocalibration = 0; 393 394 retval = kstrtoul(buf, 10, &autocalibration); 395 if (retval < 0) { 396 dev_err(dev, "Failed to store RTC autocalibration attribute\n"); 397 return -EINVAL; 398 } 399 400 retval = abx80x_rtc_set_autocalibration(dev, autocalibration); 401 402 return retval ? retval : count; 403 } 404 405 static ssize_t autocalibration_show(struct device *dev, 406 struct device_attribute *attr, char *buf) 407 { 408 int autocalibration = 0; 409 410 autocalibration = abx80x_rtc_get_autocalibration(dev); 411 if (autocalibration < 0) { 412 dev_err(dev, "Failed to read RTC autocalibration\n"); 413 sprintf(buf, "0\n"); 414 return autocalibration; 415 } 416 417 return sprintf(buf, "%d\n", autocalibration); 418 } 419 420 static DEVICE_ATTR_RW(autocalibration); 421 422 static ssize_t oscillator_store(struct device *dev, 423 struct device_attribute *attr, 424 const char *buf, size_t count) 425 { 426 struct i2c_client *client = to_i2c_client(dev); 427 int retval, flags, rc_mode = 0; 428 429 if (strncmp(buf, "rc", 2) == 0) { 430 rc_mode = 1; 431 } else if (strncmp(buf, "xtal", 4) == 0) { 432 rc_mode = 0; 433 } else { 434 dev_err(dev, "Oscillator selection value outside permitted ones\n"); 435 return -EINVAL; 436 } 437 438 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); 439 if (flags < 0) 440 return flags; 441 442 if (rc_mode == 0) 443 flags &= ~(ABX8XX_OSC_OSEL); 444 else 445 flags |= (ABX8XX_OSC_OSEL); 446 447 /* Unlock write access on Oscillator Control register */ 448 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 449 ABX8XX_CFG_KEY_OSC); 450 if (retval < 0) { 451 dev_err(dev, "Failed to write CONFIG_KEY register\n"); 452 return retval; 453 } 454 455 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); 456 if (retval < 0) { 457 dev_err(dev, "Failed to write Oscillator Control register\n"); 458 return retval; 459 } 460 461 return retval ? retval : count; 462 } 463 464 static ssize_t oscillator_show(struct device *dev, 465 struct device_attribute *attr, char *buf) 466 { 467 int rc_mode = 0; 468 struct i2c_client *client = to_i2c_client(dev); 469 470 rc_mode = abx80x_is_rc_mode(client); 471 472 if (rc_mode < 0) { 473 dev_err(dev, "Failed to read RTC oscillator selection\n"); 474 sprintf(buf, "\n"); 475 return rc_mode; 476 } 477 478 if (rc_mode) 479 return sprintf(buf, "rc\n"); 480 else 481 return sprintf(buf, "xtal\n"); 482 } 483 484 static DEVICE_ATTR_RW(oscillator); 485 486 static struct attribute *rtc_calib_attrs[] = { 487 &dev_attr_autocalibration.attr, 488 &dev_attr_oscillator.attr, 489 NULL, 490 }; 491 492 static const struct attribute_group rtc_calib_attr_group = { 493 .attrs = rtc_calib_attrs, 494 }; 495 496 static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled) 497 { 498 struct i2c_client *client = to_i2c_client(dev); 499 int err; 500 501 if (enabled) 502 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, 503 (ABX8XX_IRQ_IM_1_4 | 504 ABX8XX_IRQ_AIE)); 505 else 506 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, 507 ABX8XX_IRQ_IM_1_4); 508 return err; 509 } 510 511 static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 512 { 513 struct i2c_client *client = to_i2c_client(dev); 514 int status, tmp; 515 516 switch (cmd) { 517 case RTC_VL_READ: 518 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); 519 if (status < 0) 520 return status; 521 522 tmp = !!(status & ABX8XX_STATUS_BLF); 523 524 if (copy_to_user((void __user *)arg, &tmp, sizeof(int))) 525 return -EFAULT; 526 527 return 0; 528 529 case RTC_VL_CLR: 530 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); 531 if (status < 0) 532 return status; 533 534 status &= ~ABX8XX_STATUS_BLF; 535 536 tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); 537 if (tmp < 0) 538 return tmp; 539 540 return 0; 541 542 default: 543 return -ENOIOCTLCMD; 544 } 545 } 546 547 static const struct rtc_class_ops abx80x_rtc_ops = { 548 .read_time = abx80x_rtc_read_time, 549 .set_time = abx80x_rtc_set_time, 550 .read_alarm = abx80x_read_alarm, 551 .set_alarm = abx80x_set_alarm, 552 .alarm_irq_enable = abx80x_alarm_irq_enable, 553 .ioctl = abx80x_ioctl, 554 }; 555 556 static int abx80x_dt_trickle_cfg(struct device_node *np) 557 { 558 const char *diode; 559 int trickle_cfg = 0; 560 int i, ret; 561 u32 tmp; 562 563 ret = of_property_read_string(np, "abracon,tc-diode", &diode); 564 if (ret) 565 return ret; 566 567 if (!strcmp(diode, "standard")) 568 trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE; 569 else if (!strcmp(diode, "schottky")) 570 trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE; 571 else 572 return -EINVAL; 573 574 ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp); 575 if (ret) 576 return ret; 577 578 for (i = 0; i < sizeof(trickle_resistors); i++) 579 if (trickle_resistors[i] == tmp) 580 break; 581 582 if (i == sizeof(trickle_resistors)) 583 return -EINVAL; 584 585 return (trickle_cfg | i); 586 } 587 588 static void rtc_calib_remove_sysfs_group(void *_dev) 589 { 590 struct device *dev = _dev; 591 592 sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group); 593 } 594 595 #ifdef CONFIG_WATCHDOG 596 597 static inline u8 timeout_bits(unsigned int timeout) 598 { 599 return ((timeout << ABX8XX_WDT_BMB_SHIFT) & ABX8XX_WDT_BMB_MASK) | 600 ABX8XX_WDT_WRB_1HZ; 601 } 602 603 static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog, 604 unsigned int timeout) 605 { 606 struct abx80x_priv *priv = watchdog_get_drvdata(wdog); 607 u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout); 608 609 /* 610 * Writing any timeout to the WDT register resets the watchdog timer. 611 * Writing 0 disables it. 612 */ 613 return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val); 614 } 615 616 static int abx80x_wdog_set_timeout(struct watchdog_device *wdog, 617 unsigned int new_timeout) 618 { 619 int err = 0; 620 621 if (watchdog_hw_running(wdog)) 622 err = __abx80x_wdog_set_timeout(wdog, new_timeout); 623 624 if (err == 0) 625 wdog->timeout = new_timeout; 626 627 return err; 628 } 629 630 static int abx80x_wdog_ping(struct watchdog_device *wdog) 631 { 632 return __abx80x_wdog_set_timeout(wdog, wdog->timeout); 633 } 634 635 static int abx80x_wdog_start(struct watchdog_device *wdog) 636 { 637 return __abx80x_wdog_set_timeout(wdog, wdog->timeout); 638 } 639 640 static int abx80x_wdog_stop(struct watchdog_device *wdog) 641 { 642 return __abx80x_wdog_set_timeout(wdog, 0); 643 } 644 645 static const struct watchdog_info abx80x_wdog_info = { 646 .identity = "abx80x watchdog", 647 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, 648 }; 649 650 static const struct watchdog_ops abx80x_wdog_ops = { 651 .owner = THIS_MODULE, 652 .start = abx80x_wdog_start, 653 .stop = abx80x_wdog_stop, 654 .ping = abx80x_wdog_ping, 655 .set_timeout = abx80x_wdog_set_timeout, 656 }; 657 658 static int abx80x_setup_watchdog(struct abx80x_priv *priv) 659 { 660 priv->wdog.parent = &priv->client->dev; 661 priv->wdog.ops = &abx80x_wdog_ops; 662 priv->wdog.info = &abx80x_wdog_info; 663 priv->wdog.min_timeout = 1; 664 priv->wdog.max_timeout = ABX8XX_WDT_MAX_TIME; 665 priv->wdog.timeout = ABX8XX_WDT_MAX_TIME; 666 667 watchdog_set_drvdata(&priv->wdog, priv); 668 669 return devm_watchdog_register_device(&priv->client->dev, &priv->wdog); 670 } 671 #else 672 static int abx80x_setup_watchdog(struct abx80x_priv *priv) 673 { 674 return 0; 675 } 676 #endif 677 678 static int abx80x_probe(struct i2c_client *client, 679 const struct i2c_device_id *id) 680 { 681 struct device_node *np = client->dev.of_node; 682 struct abx80x_priv *priv; 683 int i, data, err, trickle_cfg = -EINVAL; 684 char buf[7]; 685 unsigned int part = id->driver_data; 686 unsigned int partnumber; 687 unsigned int majrev, minrev; 688 unsigned int lot; 689 unsigned int wafer; 690 unsigned int uid; 691 692 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 693 return -ENODEV; 694 695 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0, 696 sizeof(buf), buf); 697 if (err < 0) { 698 dev_err(&client->dev, "Unable to read partnumber\n"); 699 return -EIO; 700 } 701 702 partnumber = (buf[0] << 8) | buf[1]; 703 majrev = buf[2] >> 3; 704 minrev = buf[2] & 0x7; 705 lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3]; 706 uid = ((buf[4] & 0x7f) << 8) | buf[5]; 707 wafer = (buf[6] & 0x7c) >> 2; 708 dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n", 709 partnumber, majrev, minrev, lot, wafer, uid); 710 711 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1); 712 if (data < 0) { 713 dev_err(&client->dev, "Unable to read control register\n"); 714 return -EIO; 715 } 716 717 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1, 718 ((data & ~(ABX8XX_CTRL_12_24 | 719 ABX8XX_CTRL_ARST)) | 720 ABX8XX_CTRL_WRITE)); 721 if (err < 0) { 722 dev_err(&client->dev, "Unable to write control register\n"); 723 return -EIO; 724 } 725 726 /* part autodetection */ 727 if (part == ABX80X) { 728 for (i = 0; abx80x_caps[i].pn; i++) 729 if (partnumber == abx80x_caps[i].pn) 730 break; 731 if (abx80x_caps[i].pn == 0) { 732 dev_err(&client->dev, "Unknown part: %04x\n", 733 partnumber); 734 return -EINVAL; 735 } 736 part = i; 737 } 738 739 if (partnumber != abx80x_caps[part].pn) { 740 dev_err(&client->dev, "partnumber mismatch %04x != %04x\n", 741 partnumber, abx80x_caps[part].pn); 742 return -EINVAL; 743 } 744 745 if (np && abx80x_caps[part].has_tc) 746 trickle_cfg = abx80x_dt_trickle_cfg(np); 747 748 if (trickle_cfg > 0) { 749 dev_info(&client->dev, "Enabling trickle charger: %02x\n", 750 trickle_cfg); 751 abx80x_enable_trickle_charger(client, trickle_cfg); 752 } 753 754 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL, 755 BIT(2)); 756 if (err) 757 return err; 758 759 priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); 760 if (priv == NULL) 761 return -ENOMEM; 762 763 priv->rtc = devm_rtc_allocate_device(&client->dev); 764 if (IS_ERR(priv->rtc)) 765 return PTR_ERR(priv->rtc); 766 767 priv->rtc->ops = &abx80x_rtc_ops; 768 priv->client = client; 769 770 i2c_set_clientdata(client, priv); 771 772 if (abx80x_caps[part].has_wdog) { 773 err = abx80x_setup_watchdog(priv); 774 if (err) 775 return err; 776 } 777 778 if (client->irq > 0) { 779 dev_info(&client->dev, "IRQ %d supplied\n", client->irq); 780 err = devm_request_threaded_irq(&client->dev, client->irq, NULL, 781 abx80x_handle_irq, 782 IRQF_SHARED | IRQF_ONESHOT, 783 "abx8xx", 784 client); 785 if (err) { 786 dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); 787 client->irq = 0; 788 } 789 } 790 791 /* Export sysfs entries */ 792 err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group); 793 if (err) { 794 dev_err(&client->dev, "Failed to create sysfs group: %d\n", 795 err); 796 return err; 797 } 798 799 err = devm_add_action_or_reset(&client->dev, 800 rtc_calib_remove_sysfs_group, 801 &client->dev); 802 if (err) { 803 dev_err(&client->dev, 804 "Failed to add sysfs cleanup action: %d\n", 805 err); 806 return err; 807 } 808 809 err = rtc_register_device(priv->rtc); 810 811 return err; 812 } 813 814 static int abx80x_remove(struct i2c_client *client) 815 { 816 return 0; 817 } 818 819 static const struct i2c_device_id abx80x_id[] = { 820 { "abx80x", ABX80X }, 821 { "ab0801", AB0801 }, 822 { "ab0803", AB0803 }, 823 { "ab0804", AB0804 }, 824 { "ab0805", AB0805 }, 825 { "ab1801", AB1801 }, 826 { "ab1803", AB1803 }, 827 { "ab1804", AB1804 }, 828 { "ab1805", AB1805 }, 829 { "rv1805", AB1805 }, 830 { } 831 }; 832 MODULE_DEVICE_TABLE(i2c, abx80x_id); 833 834 static struct i2c_driver abx80x_driver = { 835 .driver = { 836 .name = "rtc-abx80x", 837 }, 838 .probe = abx80x_probe, 839 .remove = abx80x_remove, 840 .id_table = abx80x_id, 841 }; 842 843 module_i2c_driver(abx80x_driver); 844 845 MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>"); 846 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); 847 MODULE_DESCRIPTION("Abracon ABX80X RTC driver"); 848 MODULE_LICENSE("GPL v2"); 849