1 /* 2 * Micro Crystal RV-3029 / RV-3049 rtc class driver 3 * 4 * Author: Gregory Hermant <gregory.hermant@calao-systems.com> 5 * Michael Buesch <m@bues.ch> 6 * 7 * based on previously existing rtc class drivers 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/spi/spi.h> 18 #include <linux/bcd.h> 19 #include <linux/rtc.h> 20 #include <linux/delay.h> 21 #include <linux/of.h> 22 #include <linux/hwmon.h> 23 #include <linux/hwmon-sysfs.h> 24 #include <linux/regmap.h> 25 26 /* Register map */ 27 /* control section */ 28 #define RV3029_ONOFF_CTRL 0x00 29 #define RV3029_ONOFF_CTRL_WE BIT(0) 30 #define RV3029_ONOFF_CTRL_TE BIT(1) 31 #define RV3029_ONOFF_CTRL_TAR BIT(2) 32 #define RV3029_ONOFF_CTRL_EERE BIT(3) 33 #define RV3029_ONOFF_CTRL_SRON BIT(4) 34 #define RV3029_ONOFF_CTRL_TD0 BIT(5) 35 #define RV3029_ONOFF_CTRL_TD1 BIT(6) 36 #define RV3029_ONOFF_CTRL_CLKINT BIT(7) 37 #define RV3029_IRQ_CTRL 0x01 38 #define RV3029_IRQ_CTRL_AIE BIT(0) 39 #define RV3029_IRQ_CTRL_TIE BIT(1) 40 #define RV3029_IRQ_CTRL_V1IE BIT(2) 41 #define RV3029_IRQ_CTRL_V2IE BIT(3) 42 #define RV3029_IRQ_CTRL_SRIE BIT(4) 43 #define RV3029_IRQ_FLAGS 0x02 44 #define RV3029_IRQ_FLAGS_AF BIT(0) 45 #define RV3029_IRQ_FLAGS_TF BIT(1) 46 #define RV3029_IRQ_FLAGS_V1IF BIT(2) 47 #define RV3029_IRQ_FLAGS_V2IF BIT(3) 48 #define RV3029_IRQ_FLAGS_SRF BIT(4) 49 #define RV3029_STATUS 0x03 50 #define RV3029_STATUS_VLOW1 BIT(2) 51 #define RV3029_STATUS_VLOW2 BIT(3) 52 #define RV3029_STATUS_SR BIT(4) 53 #define RV3029_STATUS_PON BIT(5) 54 #define RV3029_STATUS_EEBUSY BIT(7) 55 #define RV3029_RST_CTRL 0x04 56 #define RV3029_RST_CTRL_SYSR BIT(4) 57 #define RV3029_CONTROL_SECTION_LEN 0x05 58 59 /* watch section */ 60 #define RV3029_W_SEC 0x08 61 #define RV3029_W_MINUTES 0x09 62 #define RV3029_W_HOURS 0x0A 63 #define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */ 64 #define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */ 65 #define RV3029_W_DATE 0x0B 66 #define RV3029_W_DAYS 0x0C 67 #define RV3029_W_MONTHS 0x0D 68 #define RV3029_W_YEARS 0x0E 69 #define RV3029_WATCH_SECTION_LEN 0x07 70 71 /* alarm section */ 72 #define RV3029_A_SC 0x10 73 #define RV3029_A_MN 0x11 74 #define RV3029_A_HR 0x12 75 #define RV3029_A_DT 0x13 76 #define RV3029_A_DW 0x14 77 #define RV3029_A_MO 0x15 78 #define RV3029_A_YR 0x16 79 #define RV3029_A_AE_X BIT(7) 80 #define RV3029_ALARM_SECTION_LEN 0x07 81 82 /* timer section */ 83 #define RV3029_TIMER_LOW 0x18 84 #define RV3029_TIMER_HIGH 0x19 85 86 /* temperature section */ 87 #define RV3029_TEMP_PAGE 0x20 88 89 /* eeprom data section */ 90 #define RV3029_E2P_EEDATA1 0x28 91 #define RV3029_E2P_EEDATA2 0x29 92 #define RV3029_E2PDATA_SECTION_LEN 0x02 93 94 /* eeprom control section */ 95 #define RV3029_CONTROL_E2P_EECTRL 0x30 96 #define RV3029_EECTRL_THP BIT(0) /* temp scan interval */ 97 #define RV3029_EECTRL_THE BIT(1) /* thermometer enable */ 98 #define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */ 99 #define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */ 100 #define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */ 101 #define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */ 102 #define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */ 103 #define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */ 104 #define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\ 105 RV3029_TRICKLE_5K |\ 106 RV3029_TRICKLE_20K |\ 107 RV3029_TRICKLE_80K) 108 #define RV3029_TRICKLE_SHIFT 4 109 #define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */ 110 #define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */ 111 #define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */ 112 #define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */ 113 #define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */ 114 115 /* user ram section */ 116 #define RV3029_USR1_RAM_PAGE 0x38 117 #define RV3029_USR1_SECTION_LEN 0x04 118 #define RV3029_USR2_RAM_PAGE 0x3C 119 #define RV3029_USR2_SECTION_LEN 0x04 120 121 struct rv3029_data { 122 struct device *dev; 123 struct rtc_device *rtc; 124 struct regmap *regmap; 125 int irq; 126 }; 127 128 static int rv3029_read_regs(struct device *dev, u8 reg, u8 *buf, 129 unsigned int len) 130 { 131 struct rv3029_data *rv3029 = dev_get_drvdata(dev); 132 133 if ((reg > RV3029_USR1_RAM_PAGE + 7) || 134 (reg + len > RV3029_USR1_RAM_PAGE + 8)) 135 return -EINVAL; 136 137 return regmap_bulk_read(rv3029->regmap, reg, buf, len); 138 } 139 140 static int rv3029_write_regs(struct device *dev, u8 reg, u8 const buf[], 141 unsigned int len) 142 { 143 struct rv3029_data *rv3029 = dev_get_drvdata(dev); 144 145 if ((reg > RV3029_USR1_RAM_PAGE + 7) || 146 (reg + len > RV3029_USR1_RAM_PAGE + 8)) 147 return -EINVAL; 148 149 return regmap_bulk_write(rv3029->regmap, reg, buf, len); 150 } 151 152 static int rv3029_update_bits(struct device *dev, u8 reg, u8 mask, u8 set) 153 { 154 u8 buf; 155 int ret; 156 157 ret = rv3029_read_regs(dev, reg, &buf, 1); 158 if (ret < 0) 159 return ret; 160 buf &= ~mask; 161 buf |= set & mask; 162 ret = rv3029_write_regs(dev, reg, &buf, 1); 163 if (ret < 0) 164 return ret; 165 166 return 0; 167 } 168 169 static int rv3029_get_sr(struct device *dev, u8 *buf) 170 { 171 int ret = rv3029_read_regs(dev, RV3029_STATUS, buf, 1); 172 173 if (ret < 0) 174 return -EIO; 175 dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); 176 return 0; 177 } 178 179 static int rv3029_set_sr(struct device *dev, u8 val) 180 { 181 u8 buf[1]; 182 int sr; 183 184 buf[0] = val; 185 sr = rv3029_write_regs(dev, RV3029_STATUS, buf, 1); 186 dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); 187 if (sr < 0) 188 return -EIO; 189 return 0; 190 } 191 192 static int rv3029_eeprom_busywait(struct device *dev) 193 { 194 int i, ret; 195 u8 sr; 196 197 for (i = 100; i > 0; i--) { 198 ret = rv3029_get_sr(dev, &sr); 199 if (ret < 0) 200 break; 201 if (!(sr & RV3029_STATUS_EEBUSY)) 202 break; 203 usleep_range(1000, 10000); 204 } 205 if (i <= 0) { 206 dev_err(dev, "EEPROM busy wait timeout.\n"); 207 return -ETIMEDOUT; 208 } 209 210 return ret; 211 } 212 213 static int rv3029_eeprom_exit(struct device *dev) 214 { 215 /* Re-enable eeprom refresh */ 216 return rv3029_update_bits(dev, RV3029_ONOFF_CTRL, 217 RV3029_ONOFF_CTRL_EERE, 218 RV3029_ONOFF_CTRL_EERE); 219 } 220 221 static int rv3029_eeprom_enter(struct device *dev) 222 { 223 int ret; 224 u8 sr; 225 226 /* Check whether we are in the allowed voltage range. */ 227 ret = rv3029_get_sr(dev, &sr); 228 if (ret < 0) 229 return ret; 230 if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) { 231 /* We clear the bits and retry once just in case 232 * we had a brown out in early startup. 233 */ 234 sr &= ~RV3029_STATUS_VLOW1; 235 sr &= ~RV3029_STATUS_VLOW2; 236 ret = rv3029_set_sr(dev, sr); 237 if (ret < 0) 238 return ret; 239 usleep_range(1000, 10000); 240 ret = rv3029_get_sr(dev, &sr); 241 if (ret < 0) 242 return ret; 243 if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) { 244 dev_err(dev, 245 "Supply voltage is too low to safely access the EEPROM.\n"); 246 return -ENODEV; 247 } 248 } 249 250 /* Disable eeprom refresh. */ 251 ret = rv3029_update_bits(dev, RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE, 252 0); 253 if (ret < 0) 254 return ret; 255 256 /* Wait for any previous eeprom accesses to finish. */ 257 ret = rv3029_eeprom_busywait(dev); 258 if (ret < 0) 259 rv3029_eeprom_exit(dev); 260 261 return ret; 262 } 263 264 static int rv3029_eeprom_read(struct device *dev, u8 reg, 265 u8 buf[], size_t len) 266 { 267 int ret, err; 268 269 err = rv3029_eeprom_enter(dev); 270 if (err < 0) 271 return err; 272 273 ret = rv3029_read_regs(dev, reg, buf, len); 274 275 err = rv3029_eeprom_exit(dev); 276 if (err < 0) 277 return err; 278 279 return ret; 280 } 281 282 static int rv3029_eeprom_write(struct device *dev, u8 reg, 283 u8 const buf[], size_t len) 284 { 285 int ret; 286 size_t i; 287 u8 tmp; 288 289 ret = rv3029_eeprom_enter(dev); 290 if (ret < 0) 291 return ret; 292 293 for (i = 0; i < len; i++, reg++) { 294 ret = rv3029_read_regs(dev, reg, &tmp, 1); 295 if (ret < 0) 296 break; 297 if (tmp != buf[i]) { 298 ret = rv3029_write_regs(dev, reg, &buf[i], 1); 299 if (ret < 0) 300 break; 301 } 302 ret = rv3029_eeprom_busywait(dev); 303 if (ret < 0) 304 break; 305 } 306 307 ret = rv3029_eeprom_exit(dev); 308 if (ret < 0) 309 return ret; 310 311 return 0; 312 } 313 314 static int rv3029_eeprom_update_bits(struct device *dev, 315 u8 reg, u8 mask, u8 set) 316 { 317 u8 buf; 318 int ret; 319 320 ret = rv3029_eeprom_read(dev, reg, &buf, 1); 321 if (ret < 0) 322 return ret; 323 buf &= ~mask; 324 buf |= set & mask; 325 ret = rv3029_eeprom_write(dev, reg, &buf, 1); 326 if (ret < 0) 327 return ret; 328 329 return 0; 330 } 331 332 static irqreturn_t rv3029_handle_irq(int irq, void *dev_id) 333 { 334 struct device *dev = dev_id; 335 struct rv3029_data *rv3029 = dev_get_drvdata(dev); 336 struct mutex *lock = &rv3029->rtc->ops_lock; 337 unsigned long events = 0; 338 u8 flags, controls; 339 int ret; 340 341 mutex_lock(lock); 342 343 ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1); 344 if (ret) { 345 dev_warn(dev, "Read IRQ Control Register error %d\n", ret); 346 mutex_unlock(lock); 347 return IRQ_NONE; 348 } 349 350 ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1); 351 if (ret) { 352 dev_warn(dev, "Read IRQ Flags Register error %d\n", ret); 353 mutex_unlock(lock); 354 return IRQ_NONE; 355 } 356 357 if (flags & RV3029_IRQ_FLAGS_AF) { 358 flags &= ~RV3029_IRQ_FLAGS_AF; 359 controls &= ~RV3029_IRQ_CTRL_AIE; 360 events |= RTC_AF; 361 } 362 363 if (events) { 364 rtc_update_irq(rv3029->rtc, 1, events); 365 rv3029_write_regs(dev, RV3029_IRQ_FLAGS, &flags, 1); 366 rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1); 367 } 368 mutex_unlock(lock); 369 370 return IRQ_HANDLED; 371 } 372 373 static int rv3029_read_time(struct device *dev, struct rtc_time *tm) 374 { 375 u8 buf[1]; 376 int ret; 377 u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, }; 378 379 ret = rv3029_get_sr(dev, buf); 380 if (ret < 0) { 381 dev_err(dev, "%s: reading SR failed\n", __func__); 382 return -EIO; 383 } 384 385 ret = rv3029_read_regs(dev, RV3029_W_SEC, regs, 386 RV3029_WATCH_SECTION_LEN); 387 if (ret < 0) { 388 dev_err(dev, "%s: reading RTC section failed\n", __func__); 389 return ret; 390 } 391 392 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]); 393 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]); 394 395 /* HR field has a more complex interpretation */ 396 { 397 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC]; 398 399 if (_hr & RV3029_REG_HR_12_24) { 400 /* 12h format */ 401 tm->tm_hour = bcd2bin(_hr & 0x1f); 402 if (_hr & RV3029_REG_HR_PM) /* PM flag set */ 403 tm->tm_hour += 12; 404 } else /* 24h format */ 405 tm->tm_hour = bcd2bin(_hr & 0x3f); 406 } 407 408 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]); 409 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1; 410 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100; 411 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1; 412 413 return 0; 414 } 415 416 static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 417 { 418 struct rtc_time *const tm = &alarm->time; 419 int ret; 420 u8 regs[8], controls, flags; 421 422 ret = rv3029_get_sr(dev, regs); 423 if (ret < 0) { 424 dev_err(dev, "%s: reading SR failed\n", __func__); 425 return -EIO; 426 } 427 428 ret = rv3029_read_regs(dev, RV3029_A_SC, regs, 429 RV3029_ALARM_SECTION_LEN); 430 431 if (ret < 0) { 432 dev_err(dev, "%s: reading alarm section failed\n", __func__); 433 return ret; 434 } 435 436 ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1); 437 if (ret) { 438 dev_err(dev, "Read IRQ Control Register error %d\n", ret); 439 return ret; 440 } 441 ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1); 442 if (ret < 0) { 443 dev_err(dev, "Read IRQ Flags Register error %d\n", ret); 444 return ret; 445 } 446 447 tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f); 448 tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f); 449 tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f); 450 tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f); 451 tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1; 452 tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100; 453 tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1; 454 455 alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE); 456 alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled; 457 458 return 0; 459 } 460 461 static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable) 462 { 463 int ret; 464 u8 controls; 465 466 ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1); 467 if (ret < 0) { 468 dev_warn(dev, "Read IRQ Control Register error %d\n", ret); 469 return ret; 470 } 471 472 /* enable/disable AIE irq */ 473 if (enable) 474 controls |= RV3029_IRQ_CTRL_AIE; 475 else 476 controls &= ~RV3029_IRQ_CTRL_AIE; 477 478 ret = rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1); 479 if (ret < 0) { 480 dev_err(dev, "can't update INT reg\n"); 481 return ret; 482 } 483 484 return 0; 485 } 486 487 static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 488 { 489 struct rtc_time *const tm = &alarm->time; 490 int ret; 491 u8 regs[8]; 492 493 /* 494 * The clock has an 8 bit wide bcd-coded register (they never learn) 495 * for the year. tm_year is an offset from 1900 and we are interested 496 * in the 2000-2099 range, so any value less than 100 is invalid. 497 */ 498 if (tm->tm_year < 100) 499 return -EINVAL; 500 501 ret = rv3029_get_sr(dev, regs); 502 if (ret < 0) { 503 dev_err(dev, "%s: reading SR failed\n", __func__); 504 return -EIO; 505 } 506 507 /* Activate all the alarms with AE_x bit */ 508 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X; 509 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X; 510 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f) 511 | RV3029_A_AE_X; 512 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f) 513 | RV3029_A_AE_X; 514 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f) 515 | RV3029_A_AE_X; 516 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7) 517 | RV3029_A_AE_X; 518 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100)) 519 | RV3029_A_AE_X; 520 521 /* Write the alarm */ 522 ret = rv3029_write_regs(dev, RV3029_A_SC, regs, 523 RV3029_ALARM_SECTION_LEN); 524 if (ret < 0) 525 return ret; 526 527 if (alarm->enabled) { 528 /* enable AIE irq */ 529 ret = rv3029_alarm_irq_enable(dev, 1); 530 if (ret) 531 return ret; 532 } else { 533 /* disable AIE irq */ 534 ret = rv3029_alarm_irq_enable(dev, 0); 535 if (ret) 536 return ret; 537 } 538 539 return 0; 540 } 541 542 static int rv3029_set_time(struct device *dev, struct rtc_time *tm) 543 { 544 u8 regs[8]; 545 int ret; 546 547 /* 548 * The clock has an 8 bit wide bcd-coded register (they never learn) 549 * for the year. tm_year is an offset from 1900 and we are interested 550 * in the 2000-2099 range, so any value less than 100 is invalid. 551 */ 552 if (tm->tm_year < 100) 553 return -EINVAL; 554 555 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec); 556 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min); 557 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour); 558 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday); 559 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1); 560 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7; 561 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100); 562 563 ret = rv3029_write_regs(dev, RV3029_W_SEC, regs, 564 RV3029_WATCH_SECTION_LEN); 565 if (ret < 0) 566 return ret; 567 568 ret = rv3029_get_sr(dev, regs); 569 if (ret < 0) { 570 dev_err(dev, "%s: reading SR failed\n", __func__); 571 return ret; 572 } 573 /* clear PON bit */ 574 ret = rv3029_set_sr(dev, (regs[0] & ~RV3029_STATUS_PON)); 575 if (ret < 0) { 576 dev_err(dev, "%s: reading SR failed\n", __func__); 577 return ret; 578 } 579 580 return 0; 581 } 582 583 static const struct rv3029_trickle_tab_elem { 584 u32 r; /* resistance in ohms */ 585 u8 conf; /* trickle config bits */ 586 } rv3029_trickle_tab[] = { 587 { 588 .r = 1076, 589 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | 590 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, 591 }, { 592 .r = 1091, 593 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | 594 RV3029_TRICKLE_20K, 595 }, { 596 .r = 1137, 597 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | 598 RV3029_TRICKLE_80K, 599 }, { 600 .r = 1154, 601 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K, 602 }, { 603 .r = 1371, 604 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K | 605 RV3029_TRICKLE_80K, 606 }, { 607 .r = 1395, 608 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K, 609 }, { 610 .r = 1472, 611 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K, 612 }, { 613 .r = 1500, 614 .conf = RV3029_TRICKLE_1K, 615 }, { 616 .r = 3810, 617 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K | 618 RV3029_TRICKLE_80K, 619 }, { 620 .r = 4000, 621 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K, 622 }, { 623 .r = 4706, 624 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K, 625 }, { 626 .r = 5000, 627 .conf = RV3029_TRICKLE_5K, 628 }, { 629 .r = 16000, 630 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, 631 }, { 632 .r = 20000, 633 .conf = RV3029_TRICKLE_20K, 634 }, { 635 .r = 80000, 636 .conf = RV3029_TRICKLE_80K, 637 }, 638 }; 639 640 static void rv3029_trickle_config(struct device *dev) 641 { 642 struct device_node *of_node = dev->of_node; 643 const struct rv3029_trickle_tab_elem *elem; 644 int i, err; 645 u32 ohms; 646 u8 trickle_set_bits; 647 648 if (!of_node) 649 return; 650 651 /* Configure the trickle charger. */ 652 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms); 653 if (err) { 654 /* Disable trickle charger. */ 655 trickle_set_bits = 0; 656 } else { 657 /* Enable trickle charger. */ 658 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) { 659 elem = &rv3029_trickle_tab[i]; 660 if (elem->r >= ohms) 661 break; 662 } 663 trickle_set_bits = elem->conf; 664 dev_info(dev, 665 "Trickle charger enabled at %d ohms resistance.\n", 666 elem->r); 667 } 668 err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL, 669 RV3029_TRICKLE_MASK, 670 trickle_set_bits); 671 if (err < 0) 672 dev_err(dev, "Failed to update trickle charger config\n"); 673 } 674 675 #ifdef CONFIG_RTC_DRV_RV3029_HWMON 676 677 static int rv3029_read_temp(struct device *dev, int *temp_mC) 678 { 679 int ret; 680 u8 temp; 681 682 ret = rv3029_read_regs(dev, RV3029_TEMP_PAGE, &temp, 1); 683 if (ret < 0) 684 return ret; 685 686 *temp_mC = ((int)temp - 60) * 1000; 687 688 return 0; 689 } 690 691 static ssize_t rv3029_hwmon_show_temp(struct device *dev, 692 struct device_attribute *attr, 693 char *buf) 694 { 695 int ret, temp_mC; 696 697 ret = rv3029_read_temp(dev, &temp_mC); 698 if (ret < 0) 699 return ret; 700 701 return sprintf(buf, "%d\n", temp_mC); 702 } 703 704 static ssize_t rv3029_hwmon_set_update_interval(struct device *dev, 705 struct device_attribute *attr, 706 const char *buf, 707 size_t count) 708 { 709 unsigned long interval_ms; 710 int ret; 711 u8 th_set_bits = 0; 712 713 ret = kstrtoul(buf, 10, &interval_ms); 714 if (ret < 0) 715 return ret; 716 717 if (interval_ms != 0) { 718 th_set_bits |= RV3029_EECTRL_THE; 719 if (interval_ms >= 16000) 720 th_set_bits |= RV3029_EECTRL_THP; 721 } 722 ret = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL, 723 RV3029_EECTRL_THE | RV3029_EECTRL_THP, 724 th_set_bits); 725 if (ret < 0) 726 return ret; 727 728 return count; 729 } 730 731 static ssize_t rv3029_hwmon_show_update_interval(struct device *dev, 732 struct device_attribute *attr, 733 char *buf) 734 { 735 int ret, interval_ms; 736 u8 eectrl; 737 738 ret = rv3029_eeprom_read(dev, RV3029_CONTROL_E2P_EECTRL, 739 &eectrl, 1); 740 if (ret < 0) 741 return ret; 742 743 if (eectrl & RV3029_EECTRL_THE) { 744 if (eectrl & RV3029_EECTRL_THP) 745 interval_ms = 16000; 746 else 747 interval_ms = 1000; 748 } else { 749 interval_ms = 0; 750 } 751 752 return sprintf(buf, "%d\n", interval_ms); 753 } 754 755 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp, 756 NULL, 0); 757 static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, 758 rv3029_hwmon_show_update_interval, 759 rv3029_hwmon_set_update_interval, 0); 760 761 static struct attribute *rv3029_hwmon_attrs[] = { 762 &sensor_dev_attr_temp1_input.dev_attr.attr, 763 &sensor_dev_attr_update_interval.dev_attr.attr, 764 NULL, 765 }; 766 ATTRIBUTE_GROUPS(rv3029_hwmon); 767 768 static void rv3029_hwmon_register(struct device *dev, const char *name) 769 { 770 struct rv3029_data *rv3029 = dev_get_drvdata(dev); 771 struct device *hwmon_dev; 772 773 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029, 774 rv3029_hwmon_groups); 775 if (IS_ERR(hwmon_dev)) { 776 dev_warn(dev, "unable to register hwmon device %ld\n", 777 PTR_ERR(hwmon_dev)); 778 } 779 } 780 781 #else /* CONFIG_RTC_DRV_RV3029_HWMON */ 782 783 static void rv3029_hwmon_register(struct device *dev, const char *name) 784 { 785 } 786 787 #endif /* CONFIG_RTC_DRV_RV3029_HWMON */ 788 789 static struct rtc_class_ops rv3029_rtc_ops = { 790 .read_time = rv3029_read_time, 791 .set_time = rv3029_set_time, 792 }; 793 794 static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq, 795 const char *name) 796 { 797 struct rv3029_data *rv3029; 798 int rc = 0; 799 u8 buf[1]; 800 801 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL); 802 if (!rv3029) 803 return -ENOMEM; 804 805 rv3029->regmap = regmap; 806 rv3029->irq = irq; 807 rv3029->dev = dev; 808 dev_set_drvdata(dev, rv3029); 809 810 rc = rv3029_get_sr(dev, buf); 811 if (rc < 0) { 812 dev_err(dev, "reading status failed\n"); 813 return rc; 814 } 815 816 rv3029_trickle_config(dev); 817 rv3029_hwmon_register(dev, name); 818 819 rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops, 820 THIS_MODULE); 821 if (IS_ERR(rv3029->rtc)) { 822 dev_err(dev, "unable to register the class device\n"); 823 return PTR_ERR(rv3029->rtc); 824 } 825 826 if (rv3029->irq > 0) { 827 rc = devm_request_threaded_irq(dev, rv3029->irq, 828 NULL, rv3029_handle_irq, 829 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 830 "rv3029", dev); 831 if (rc) { 832 dev_warn(dev, "unable to request IRQ, alarms disabled\n"); 833 rv3029->irq = 0; 834 } else { 835 rv3029_rtc_ops.read_alarm = rv3029_read_alarm; 836 rv3029_rtc_ops.set_alarm = rv3029_set_alarm; 837 rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable; 838 } 839 } 840 841 return 0; 842 } 843 844 #if IS_ENABLED(CONFIG_I2C) 845 846 static int rv3029_i2c_probe(struct i2c_client *client, 847 const struct i2c_device_id *id) 848 { 849 struct regmap *regmap; 850 static const struct regmap_config config = { 851 .reg_bits = 8, 852 .val_bits = 8, 853 }; 854 855 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK | 856 I2C_FUNC_SMBUS_BYTE)) { 857 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n"); 858 return -ENODEV; 859 } 860 861 regmap = devm_regmap_init_i2c(client, &config); 862 if (IS_ERR(regmap)) { 863 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n", 864 __func__, PTR_ERR(regmap)); 865 return PTR_ERR(regmap); 866 } 867 868 return rv3029_probe(&client->dev, regmap, client->irq, client->name); 869 } 870 871 static const struct i2c_device_id rv3029_id[] = { 872 { "rv3029", 0 }, 873 { "rv3029c2", 0 }, 874 { } 875 }; 876 MODULE_DEVICE_TABLE(i2c, rv3029_id); 877 878 static const struct of_device_id rv3029_of_match[] = { 879 { .compatible = "microcrystal,rv3029" }, 880 /* Backward compatibility only, do not use compatibles below: */ 881 { .compatible = "rv3029" }, 882 { .compatible = "rv3029c2" }, 883 { .compatible = "mc,rv3029c2" }, 884 { } 885 }; 886 MODULE_DEVICE_TABLE(of, rv3029_of_match); 887 888 static struct i2c_driver rv3029_driver = { 889 .driver = { 890 .name = "rtc-rv3029c2", 891 .of_match_table = of_match_ptr(rv3029_of_match), 892 }, 893 .probe = rv3029_i2c_probe, 894 .id_table = rv3029_id, 895 }; 896 897 static int rv3029_register_driver(void) 898 { 899 return i2c_add_driver(&rv3029_driver); 900 } 901 902 static void rv3029_unregister_driver(void) 903 { 904 i2c_del_driver(&rv3029_driver); 905 } 906 907 #else 908 909 static int rv3029_register_driver(void) 910 { 911 return 0; 912 } 913 914 static void rv3029_unregister_driver(void) 915 { 916 } 917 918 #endif 919 920 #if IS_ENABLED(CONFIG_SPI_MASTER) 921 922 static int rv3049_probe(struct spi_device *spi) 923 { 924 static const struct regmap_config config = { 925 .reg_bits = 8, 926 .val_bits = 8, 927 }; 928 struct regmap *regmap; 929 930 regmap = devm_regmap_init_spi(spi, &config); 931 if (IS_ERR(regmap)) { 932 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n", 933 __func__, PTR_ERR(regmap)); 934 return PTR_ERR(regmap); 935 } 936 937 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049"); 938 } 939 940 static struct spi_driver rv3049_driver = { 941 .driver = { 942 .name = "rv3049", 943 }, 944 .probe = rv3049_probe, 945 }; 946 947 static int rv3049_register_driver(void) 948 { 949 return spi_register_driver(&rv3049_driver); 950 } 951 952 static void rv3049_unregister_driver(void) 953 { 954 spi_unregister_driver(&rv3049_driver); 955 } 956 957 #else 958 959 static int rv3049_register_driver(void) 960 { 961 return 0; 962 } 963 964 static void rv3049_unregister_driver(void) 965 { 966 } 967 968 #endif 969 970 static int __init rv30x9_init(void) 971 { 972 int ret; 973 974 ret = rv3029_register_driver(); 975 if (ret) { 976 pr_err("Failed to register rv3029 driver: %d\n", ret); 977 return ret; 978 } 979 980 ret = rv3049_register_driver(); 981 if (ret) { 982 pr_err("Failed to register rv3049 driver: %d\n", ret); 983 rv3029_unregister_driver(); 984 } 985 986 return ret; 987 } 988 module_init(rv30x9_init) 989 990 static void __exit rv30x9_exit(void) 991 { 992 rv3049_unregister_driver(); 993 rv3029_unregister_driver(); 994 } 995 module_exit(rv30x9_exit) 996 997 MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>"); 998 MODULE_AUTHOR("Michael Buesch <m@bues.ch>"); 999 MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver"); 1000 MODULE_LICENSE("GPL"); 1001 MODULE_ALIAS("spi:rv3049"); 1002