1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * A driver for the I2C members of the Abracon AB x8xx RTC family, 4 * and compatible: AB 1805 and AB 0805 5 * 6 * Copyright 2014-2015 Macq S.A. 7 * 8 * Author: Philippe De Muyter <phdm@macqel.be> 9 * Author: Alexandre Belloni <alexandre.belloni@bootlin.com> 10 * 11 */ 12 13 #include <linux/bcd.h> 14 #include <linux/i2c.h> 15 #include <linux/module.h> 16 #include <linux/rtc.h> 17 #include <linux/watchdog.h> 18 19 #define ABX8XX_REG_HTH 0x00 20 #define ABX8XX_REG_SC 0x01 21 #define ABX8XX_REG_MN 0x02 22 #define ABX8XX_REG_HR 0x03 23 #define ABX8XX_REG_DA 0x04 24 #define ABX8XX_REG_MO 0x05 25 #define ABX8XX_REG_YR 0x06 26 #define ABX8XX_REG_WD 0x07 27 28 #define ABX8XX_REG_AHTH 0x08 29 #define ABX8XX_REG_ASC 0x09 30 #define ABX8XX_REG_AMN 0x0a 31 #define ABX8XX_REG_AHR 0x0b 32 #define ABX8XX_REG_ADA 0x0c 33 #define ABX8XX_REG_AMO 0x0d 34 #define ABX8XX_REG_AWD 0x0e 35 36 #define ABX8XX_REG_STATUS 0x0f 37 #define ABX8XX_STATUS_AF BIT(2) 38 #define ABX8XX_STATUS_BLF BIT(4) 39 #define ABX8XX_STATUS_WDT BIT(6) 40 41 #define ABX8XX_REG_CTRL1 0x10 42 #define ABX8XX_CTRL_WRITE BIT(0) 43 #define ABX8XX_CTRL_ARST BIT(2) 44 #define ABX8XX_CTRL_12_24 BIT(6) 45 46 #define ABX8XX_REG_CTRL2 0x11 47 #define ABX8XX_CTRL2_RSVD BIT(5) 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_OUT_CTRL 0x30 82 #define ABX8XX_OUT_CTRL_EXDS BIT(4) 83 84 #define ABX8XX_REG_TRICKLE 0x20 85 #define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0 86 #define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 87 #define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 88 89 static u8 trickle_resistors[] = {0, 3, 6, 11}; 90 91 enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, 92 AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X}; 93 94 struct abx80x_cap { 95 u16 pn; 96 bool has_tc; 97 bool has_wdog; 98 }; 99 100 static struct abx80x_cap abx80x_caps[] = { 101 [AB0801] = {.pn = 0x0801}, 102 [AB0803] = {.pn = 0x0803}, 103 [AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true}, 104 [AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true}, 105 [AB1801] = {.pn = 0x1801}, 106 [AB1803] = {.pn = 0x1803}, 107 [AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true}, 108 [AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, 109 [RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, 110 [ABX80X] = {.pn = 0} 111 }; 112 113 struct abx80x_priv { 114 struct rtc_device *rtc; 115 struct i2c_client *client; 116 struct watchdog_device wdog; 117 }; 118 119 static int abx80x_is_rc_mode(struct i2c_client *client) 120 { 121 int flags = 0; 122 123 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); 124 if (flags < 0) { 125 dev_err(&client->dev, 126 "Failed to read autocalibration attribute\n"); 127 return flags; 128 } 129 130 return (flags & ABX8XX_OSS_OMODE) ? 1 : 0; 131 } 132 133 static int abx80x_enable_trickle_charger(struct i2c_client *client, 134 u8 trickle_cfg) 135 { 136 int err; 137 138 /* 139 * Write the configuration key register to enable access to the Trickle 140 * register 141 */ 142 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 143 ABX8XX_CFG_KEY_MISC); 144 if (err < 0) { 145 dev_err(&client->dev, "Unable to write configuration key\n"); 146 return -EIO; 147 } 148 149 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE, 150 ABX8XX_TRICKLE_CHARGE_ENABLE | 151 trickle_cfg); 152 if (err < 0) { 153 dev_err(&client->dev, "Unable to write trickle register\n"); 154 return -EIO; 155 } 156 157 return 0; 158 } 159 160 static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm) 161 { 162 struct i2c_client *client = to_i2c_client(dev); 163 unsigned char buf[8]; 164 int err, flags, rc_mode = 0; 165 166 /* Read the Oscillator Failure only in XT mode */ 167 rc_mode = abx80x_is_rc_mode(client); 168 if (rc_mode < 0) 169 return rc_mode; 170 171 if (!rc_mode) { 172 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); 173 if (flags < 0) 174 return flags; 175 176 if (flags & ABX8XX_OSS_OF) { 177 dev_err(dev, "Oscillator failure, data is invalid.\n"); 178 return -EINVAL; 179 } 180 } 181 182 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH, 183 sizeof(buf), buf); 184 if (err < 0) { 185 dev_err(&client->dev, "Unable to read date\n"); 186 return -EIO; 187 } 188 189 tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F); 190 tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F); 191 tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F); 192 tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7; 193 tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F); 194 tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1; 195 tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100; 196 197 return 0; 198 } 199 200 static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm) 201 { 202 struct i2c_client *client = to_i2c_client(dev); 203 unsigned char buf[8]; 204 int err, flags; 205 206 if (tm->tm_year < 100) 207 return -EINVAL; 208 209 buf[ABX8XX_REG_HTH] = 0; 210 buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec); 211 buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min); 212 buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour); 213 buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday); 214 buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1); 215 buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100); 216 buf[ABX8XX_REG_WD] = tm->tm_wday; 217 218 err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH, 219 sizeof(buf), buf); 220 if (err < 0) { 221 dev_err(&client->dev, "Unable to write to date registers\n"); 222 return -EIO; 223 } 224 225 /* Clear the OF bit of Oscillator Status Register */ 226 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); 227 if (flags < 0) 228 return flags; 229 230 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS, 231 flags & ~ABX8XX_OSS_OF); 232 if (err < 0) { 233 dev_err(&client->dev, "Unable to write oscillator status register\n"); 234 return err; 235 } 236 237 return 0; 238 } 239 240 static irqreturn_t abx80x_handle_irq(int irq, void *dev_id) 241 { 242 struct i2c_client *client = dev_id; 243 struct abx80x_priv *priv = i2c_get_clientdata(client); 244 struct rtc_device *rtc = priv->rtc; 245 int status; 246 247 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); 248 if (status < 0) 249 return IRQ_NONE; 250 251 if (status & ABX8XX_STATUS_AF) 252 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF); 253 254 /* 255 * It is unclear if we'll get an interrupt before the external 256 * reset kicks in. 257 */ 258 if (status & ABX8XX_STATUS_WDT) 259 dev_alert(&client->dev, "watchdog timeout interrupt.\n"); 260 261 i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); 262 263 return IRQ_HANDLED; 264 } 265 266 static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) 267 { 268 struct i2c_client *client = to_i2c_client(dev); 269 unsigned char buf[7]; 270 271 int irq_mask, err; 272 273 if (client->irq <= 0) 274 return -EINVAL; 275 276 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC, 277 sizeof(buf), buf); 278 if (err) 279 return err; 280 281 irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ); 282 if (irq_mask < 0) 283 return irq_mask; 284 285 t->time.tm_sec = bcd2bin(buf[0] & 0x7F); 286 t->time.tm_min = bcd2bin(buf[1] & 0x7F); 287 t->time.tm_hour = bcd2bin(buf[2] & 0x3F); 288 t->time.tm_mday = bcd2bin(buf[3] & 0x3F); 289 t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1; 290 t->time.tm_wday = buf[5] & 0x7; 291 292 t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE); 293 t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled; 294 295 return err; 296 } 297 298 static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t) 299 { 300 struct i2c_client *client = to_i2c_client(dev); 301 u8 alarm[6]; 302 int err; 303 304 if (client->irq <= 0) 305 return -EINVAL; 306 307 alarm[0] = 0x0; 308 alarm[1] = bin2bcd(t->time.tm_sec); 309 alarm[2] = bin2bcd(t->time.tm_min); 310 alarm[3] = bin2bcd(t->time.tm_hour); 311 alarm[4] = bin2bcd(t->time.tm_mday); 312 alarm[5] = bin2bcd(t->time.tm_mon + 1); 313 314 err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH, 315 sizeof(alarm), alarm); 316 if (err < 0) { 317 dev_err(&client->dev, "Unable to write alarm registers\n"); 318 return -EIO; 319 } 320 321 if (t->enabled) { 322 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, 323 (ABX8XX_IRQ_IM_1_4 | 324 ABX8XX_IRQ_AIE)); 325 if (err) 326 return err; 327 } 328 329 return 0; 330 } 331 332 static int abx80x_rtc_set_autocalibration(struct device *dev, 333 int autocalibration) 334 { 335 struct i2c_client *client = to_i2c_client(dev); 336 int retval, flags = 0; 337 338 if ((autocalibration != 0) && (autocalibration != 1024) && 339 (autocalibration != 512)) { 340 dev_err(dev, "autocalibration value outside permitted range\n"); 341 return -EINVAL; 342 } 343 344 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); 345 if (flags < 0) 346 return flags; 347 348 if (autocalibration == 0) { 349 flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024); 350 } else if (autocalibration == 1024) { 351 /* 1024 autocalibration is 0x10 */ 352 flags |= ABX8XX_OSC_ACAL_1024; 353 flags &= ~(ABX8XX_OSC_ACAL_512); 354 } else { 355 /* 512 autocalibration is 0x11 */ 356 flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512); 357 } 358 359 /* Unlock write access to Oscillator Control Register */ 360 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 361 ABX8XX_CFG_KEY_OSC); 362 if (retval < 0) { 363 dev_err(dev, "Failed to write CONFIG_KEY register\n"); 364 return retval; 365 } 366 367 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); 368 369 return retval; 370 } 371 372 static int abx80x_rtc_get_autocalibration(struct device *dev) 373 { 374 struct i2c_client *client = to_i2c_client(dev); 375 int flags = 0, autocalibration; 376 377 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); 378 if (flags < 0) 379 return flags; 380 381 if (flags & ABX8XX_OSC_ACAL_512) 382 autocalibration = 512; 383 else if (flags & ABX8XX_OSC_ACAL_1024) 384 autocalibration = 1024; 385 else 386 autocalibration = 0; 387 388 return autocalibration; 389 } 390 391 static ssize_t autocalibration_store(struct device *dev, 392 struct device_attribute *attr, 393 const char *buf, size_t count) 394 { 395 int retval; 396 unsigned long autocalibration = 0; 397 398 retval = kstrtoul(buf, 10, &autocalibration); 399 if (retval < 0) { 400 dev_err(dev, "Failed to store RTC autocalibration attribute\n"); 401 return -EINVAL; 402 } 403 404 retval = abx80x_rtc_set_autocalibration(dev->parent, autocalibration); 405 406 return retval ? retval : count; 407 } 408 409 static ssize_t autocalibration_show(struct device *dev, 410 struct device_attribute *attr, char *buf) 411 { 412 int autocalibration = 0; 413 414 autocalibration = abx80x_rtc_get_autocalibration(dev->parent); 415 if (autocalibration < 0) { 416 dev_err(dev, "Failed to read RTC autocalibration\n"); 417 sprintf(buf, "0\n"); 418 return autocalibration; 419 } 420 421 return sprintf(buf, "%d\n", autocalibration); 422 } 423 424 static DEVICE_ATTR_RW(autocalibration); 425 426 static ssize_t oscillator_store(struct device *dev, 427 struct device_attribute *attr, 428 const char *buf, size_t count) 429 { 430 struct i2c_client *client = to_i2c_client(dev->parent); 431 int retval, flags, rc_mode = 0; 432 433 if (strncmp(buf, "rc", 2) == 0) { 434 rc_mode = 1; 435 } else if (strncmp(buf, "xtal", 4) == 0) { 436 rc_mode = 0; 437 } else { 438 dev_err(dev, "Oscillator selection value outside permitted ones\n"); 439 return -EINVAL; 440 } 441 442 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); 443 if (flags < 0) 444 return flags; 445 446 if (rc_mode == 0) 447 flags &= ~(ABX8XX_OSC_OSEL); 448 else 449 flags |= (ABX8XX_OSC_OSEL); 450 451 /* Unlock write access on Oscillator Control register */ 452 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 453 ABX8XX_CFG_KEY_OSC); 454 if (retval < 0) { 455 dev_err(dev, "Failed to write CONFIG_KEY register\n"); 456 return retval; 457 } 458 459 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); 460 if (retval < 0) { 461 dev_err(dev, "Failed to write Oscillator Control register\n"); 462 return retval; 463 } 464 465 return retval ? retval : count; 466 } 467 468 static ssize_t oscillator_show(struct device *dev, 469 struct device_attribute *attr, char *buf) 470 { 471 int rc_mode = 0; 472 struct i2c_client *client = to_i2c_client(dev->parent); 473 474 rc_mode = abx80x_is_rc_mode(client); 475 476 if (rc_mode < 0) { 477 dev_err(dev, "Failed to read RTC oscillator selection\n"); 478 sprintf(buf, "\n"); 479 return rc_mode; 480 } 481 482 if (rc_mode) 483 return sprintf(buf, "rc\n"); 484 else 485 return sprintf(buf, "xtal\n"); 486 } 487 488 static DEVICE_ATTR_RW(oscillator); 489 490 static struct attribute *rtc_calib_attrs[] = { 491 &dev_attr_autocalibration.attr, 492 &dev_attr_oscillator.attr, 493 NULL, 494 }; 495 496 static const struct attribute_group rtc_calib_attr_group = { 497 .attrs = rtc_calib_attrs, 498 }; 499 500 static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled) 501 { 502 struct i2c_client *client = to_i2c_client(dev); 503 int err; 504 505 if (enabled) 506 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, 507 (ABX8XX_IRQ_IM_1_4 | 508 ABX8XX_IRQ_AIE)); 509 else 510 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, 511 ABX8XX_IRQ_IM_1_4); 512 return err; 513 } 514 515 static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 516 { 517 struct i2c_client *client = to_i2c_client(dev); 518 int status, tmp; 519 520 switch (cmd) { 521 case RTC_VL_READ: 522 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); 523 if (status < 0) 524 return status; 525 526 tmp = !!(status & ABX8XX_STATUS_BLF); 527 528 if (copy_to_user((void __user *)arg, &tmp, sizeof(int))) 529 return -EFAULT; 530 531 return 0; 532 533 case RTC_VL_CLR: 534 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); 535 if (status < 0) 536 return status; 537 538 status &= ~ABX8XX_STATUS_BLF; 539 540 tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); 541 if (tmp < 0) 542 return tmp; 543 544 return 0; 545 546 default: 547 return -ENOIOCTLCMD; 548 } 549 } 550 551 static const struct rtc_class_ops abx80x_rtc_ops = { 552 .read_time = abx80x_rtc_read_time, 553 .set_time = abx80x_rtc_set_time, 554 .read_alarm = abx80x_read_alarm, 555 .set_alarm = abx80x_set_alarm, 556 .alarm_irq_enable = abx80x_alarm_irq_enable, 557 .ioctl = abx80x_ioctl, 558 }; 559 560 static int abx80x_dt_trickle_cfg(struct device_node *np) 561 { 562 const char *diode; 563 int trickle_cfg = 0; 564 int i, ret; 565 u32 tmp; 566 567 ret = of_property_read_string(np, "abracon,tc-diode", &diode); 568 if (ret) 569 return ret; 570 571 if (!strcmp(diode, "standard")) 572 trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE; 573 else if (!strcmp(diode, "schottky")) 574 trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE; 575 else 576 return -EINVAL; 577 578 ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp); 579 if (ret) 580 return ret; 581 582 for (i = 0; i < sizeof(trickle_resistors); i++) 583 if (trickle_resistors[i] == tmp) 584 break; 585 586 if (i == sizeof(trickle_resistors)) 587 return -EINVAL; 588 589 return (trickle_cfg | i); 590 } 591 592 #ifdef CONFIG_WATCHDOG 593 594 static inline u8 timeout_bits(unsigned int timeout) 595 { 596 return ((timeout << ABX8XX_WDT_BMB_SHIFT) & ABX8XX_WDT_BMB_MASK) | 597 ABX8XX_WDT_WRB_1HZ; 598 } 599 600 static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog, 601 unsigned int timeout) 602 { 603 struct abx80x_priv *priv = watchdog_get_drvdata(wdog); 604 u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout); 605 606 /* 607 * Writing any timeout to the WDT register resets the watchdog timer. 608 * Writing 0 disables it. 609 */ 610 return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val); 611 } 612 613 static int abx80x_wdog_set_timeout(struct watchdog_device *wdog, 614 unsigned int new_timeout) 615 { 616 int err = 0; 617 618 if (watchdog_hw_running(wdog)) 619 err = __abx80x_wdog_set_timeout(wdog, new_timeout); 620 621 if (err == 0) 622 wdog->timeout = new_timeout; 623 624 return err; 625 } 626 627 static int abx80x_wdog_ping(struct watchdog_device *wdog) 628 { 629 return __abx80x_wdog_set_timeout(wdog, wdog->timeout); 630 } 631 632 static int abx80x_wdog_start(struct watchdog_device *wdog) 633 { 634 return __abx80x_wdog_set_timeout(wdog, wdog->timeout); 635 } 636 637 static int abx80x_wdog_stop(struct watchdog_device *wdog) 638 { 639 return __abx80x_wdog_set_timeout(wdog, 0); 640 } 641 642 static const struct watchdog_info abx80x_wdog_info = { 643 .identity = "abx80x watchdog", 644 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, 645 }; 646 647 static const struct watchdog_ops abx80x_wdog_ops = { 648 .owner = THIS_MODULE, 649 .start = abx80x_wdog_start, 650 .stop = abx80x_wdog_stop, 651 .ping = abx80x_wdog_ping, 652 .set_timeout = abx80x_wdog_set_timeout, 653 }; 654 655 static int abx80x_setup_watchdog(struct abx80x_priv *priv) 656 { 657 priv->wdog.parent = &priv->client->dev; 658 priv->wdog.ops = &abx80x_wdog_ops; 659 priv->wdog.info = &abx80x_wdog_info; 660 priv->wdog.min_timeout = 1; 661 priv->wdog.max_timeout = ABX8XX_WDT_MAX_TIME; 662 priv->wdog.timeout = ABX8XX_WDT_MAX_TIME; 663 664 watchdog_set_drvdata(&priv->wdog, priv); 665 666 return devm_watchdog_register_device(&priv->client->dev, &priv->wdog); 667 } 668 #else 669 static int abx80x_setup_watchdog(struct abx80x_priv *priv) 670 { 671 return 0; 672 } 673 #endif 674 675 static int abx80x_probe(struct i2c_client *client, 676 const struct i2c_device_id *id) 677 { 678 struct device_node *np = client->dev.of_node; 679 struct abx80x_priv *priv; 680 int i, data, err, trickle_cfg = -EINVAL; 681 char buf[7]; 682 unsigned int part = id->driver_data; 683 unsigned int partnumber; 684 unsigned int majrev, minrev; 685 unsigned int lot; 686 unsigned int wafer; 687 unsigned int uid; 688 689 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 690 return -ENODEV; 691 692 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0, 693 sizeof(buf), buf); 694 if (err < 0) { 695 dev_err(&client->dev, "Unable to read partnumber\n"); 696 return -EIO; 697 } 698 699 partnumber = (buf[0] << 8) | buf[1]; 700 majrev = buf[2] >> 3; 701 minrev = buf[2] & 0x7; 702 lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3]; 703 uid = ((buf[4] & 0x7f) << 8) | buf[5]; 704 wafer = (buf[6] & 0x7c) >> 2; 705 dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n", 706 partnumber, majrev, minrev, lot, wafer, uid); 707 708 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1); 709 if (data < 0) { 710 dev_err(&client->dev, "Unable to read control register\n"); 711 return -EIO; 712 } 713 714 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1, 715 ((data & ~(ABX8XX_CTRL_12_24 | 716 ABX8XX_CTRL_ARST)) | 717 ABX8XX_CTRL_WRITE)); 718 if (err < 0) { 719 dev_err(&client->dev, "Unable to write control register\n"); 720 return -EIO; 721 } 722 723 /* Configure RV1805 specifics */ 724 if (part == RV1805) { 725 /* 726 * Avoid accidentally entering test mode. This can happen 727 * on the RV1805 in case the reserved bit 5 in control2 728 * register is set. RV-1805-C3 datasheet indicates that 729 * the bit should be cleared in section 11h - Control2. 730 */ 731 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL2); 732 if (data < 0) { 733 dev_err(&client->dev, 734 "Unable to read control2 register\n"); 735 return -EIO; 736 } 737 738 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL2, 739 data & ~ABX8XX_CTRL2_RSVD); 740 if (err < 0) { 741 dev_err(&client->dev, 742 "Unable to write control2 register\n"); 743 return -EIO; 744 } 745 746 /* 747 * Avoid extra power leakage. The RV1805 uses smaller 748 * 10pin package and the EXTI input is not present. 749 * Disable it to avoid leakage. 750 */ 751 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_OUT_CTRL); 752 if (data < 0) { 753 dev_err(&client->dev, 754 "Unable to read output control register\n"); 755 return -EIO; 756 } 757 758 /* 759 * Write the configuration key register to enable access to 760 * the config2 register 761 */ 762 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, 763 ABX8XX_CFG_KEY_MISC); 764 if (err < 0) { 765 dev_err(&client->dev, 766 "Unable to write configuration key\n"); 767 return -EIO; 768 } 769 770 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL, 771 data | ABX8XX_OUT_CTRL_EXDS); 772 if (err < 0) { 773 dev_err(&client->dev, 774 "Unable to write output control register\n"); 775 return -EIO; 776 } 777 } 778 779 /* part autodetection */ 780 if (part == ABX80X) { 781 for (i = 0; abx80x_caps[i].pn; i++) 782 if (partnumber == abx80x_caps[i].pn) 783 break; 784 if (abx80x_caps[i].pn == 0) { 785 dev_err(&client->dev, "Unknown part: %04x\n", 786 partnumber); 787 return -EINVAL; 788 } 789 part = i; 790 } 791 792 if (partnumber != abx80x_caps[part].pn) { 793 dev_err(&client->dev, "partnumber mismatch %04x != %04x\n", 794 partnumber, abx80x_caps[part].pn); 795 return -EINVAL; 796 } 797 798 if (np && abx80x_caps[part].has_tc) 799 trickle_cfg = abx80x_dt_trickle_cfg(np); 800 801 if (trickle_cfg > 0) { 802 dev_info(&client->dev, "Enabling trickle charger: %02x\n", 803 trickle_cfg); 804 abx80x_enable_trickle_charger(client, trickle_cfg); 805 } 806 807 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL, 808 BIT(2)); 809 if (err) 810 return err; 811 812 priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); 813 if (priv == NULL) 814 return -ENOMEM; 815 816 priv->rtc = devm_rtc_allocate_device(&client->dev); 817 if (IS_ERR(priv->rtc)) 818 return PTR_ERR(priv->rtc); 819 820 priv->rtc->ops = &abx80x_rtc_ops; 821 priv->client = client; 822 823 i2c_set_clientdata(client, priv); 824 825 if (abx80x_caps[part].has_wdog) { 826 err = abx80x_setup_watchdog(priv); 827 if (err) 828 return err; 829 } 830 831 if (client->irq > 0) { 832 dev_info(&client->dev, "IRQ %d supplied\n", client->irq); 833 err = devm_request_threaded_irq(&client->dev, client->irq, NULL, 834 abx80x_handle_irq, 835 IRQF_SHARED | IRQF_ONESHOT, 836 "abx8xx", 837 client); 838 if (err) { 839 dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); 840 client->irq = 0; 841 } 842 } 843 844 err = rtc_add_group(priv->rtc, &rtc_calib_attr_group); 845 if (err) { 846 dev_err(&client->dev, "Failed to create sysfs group: %d\n", 847 err); 848 return err; 849 } 850 851 return rtc_register_device(priv->rtc); 852 } 853 854 static const struct i2c_device_id abx80x_id[] = { 855 { "abx80x", ABX80X }, 856 { "ab0801", AB0801 }, 857 { "ab0803", AB0803 }, 858 { "ab0804", AB0804 }, 859 { "ab0805", AB0805 }, 860 { "ab1801", AB1801 }, 861 { "ab1803", AB1803 }, 862 { "ab1804", AB1804 }, 863 { "ab1805", AB1805 }, 864 { "rv1805", RV1805 }, 865 { } 866 }; 867 MODULE_DEVICE_TABLE(i2c, abx80x_id); 868 869 static struct i2c_driver abx80x_driver = { 870 .driver = { 871 .name = "rtc-abx80x", 872 }, 873 .probe = abx80x_probe, 874 .id_table = abx80x_id, 875 }; 876 877 module_i2c_driver(abx80x_driver); 878 879 MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>"); 880 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>"); 881 MODULE_DESCRIPTION("Abracon ABX80X RTC driver"); 882 MODULE_LICENSE("GPL v2"); 883