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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Micro Crystal RV-3029 / RV-3049 rtc class driver4 *5 * Author: Gregory Hermant <gregory.hermant@calao-systems.com>6 * Michael Buesch <m@bues.ch>7 *8 * based on previously existing rtc class drivers9 */10 11#include <linux/module.h>12#include <linux/i2c.h>13#include <linux/spi/spi.h>14#include <linux/bcd.h>15#include <linux/rtc.h>16#include <linux/delay.h>17#include <linux/of.h>18#include <linux/hwmon.h>19#include <linux/hwmon-sysfs.h>20#include <linux/kstrtox.h>21#include <linux/regmap.h>22 23/* Register map */24/* control section */25#define RV3029_ONOFF_CTRL 0x0026#define RV3029_ONOFF_CTRL_WE BIT(0)27#define RV3029_ONOFF_CTRL_TE BIT(1)28#define RV3029_ONOFF_CTRL_TAR BIT(2)29#define RV3029_ONOFF_CTRL_EERE BIT(3)30#define RV3029_ONOFF_CTRL_SRON BIT(4)31#define RV3029_ONOFF_CTRL_TD0 BIT(5)32#define RV3029_ONOFF_CTRL_TD1 BIT(6)33#define RV3029_ONOFF_CTRL_CLKINT BIT(7)34#define RV3029_IRQ_CTRL 0x0135#define RV3029_IRQ_CTRL_AIE BIT(0)36#define RV3029_IRQ_CTRL_TIE BIT(1)37#define RV3029_IRQ_CTRL_V1IE BIT(2)38#define RV3029_IRQ_CTRL_V2IE BIT(3)39#define RV3029_IRQ_CTRL_SRIE BIT(4)40#define RV3029_IRQ_FLAGS 0x0241#define RV3029_IRQ_FLAGS_AF BIT(0)42#define RV3029_IRQ_FLAGS_TF BIT(1)43#define RV3029_IRQ_FLAGS_V1IF BIT(2)44#define RV3029_IRQ_FLAGS_V2IF BIT(3)45#define RV3029_IRQ_FLAGS_SRF BIT(4)46#define RV3029_STATUS 0x0347#define RV3029_STATUS_VLOW1 BIT(2)48#define RV3029_STATUS_VLOW2 BIT(3)49#define RV3029_STATUS_SR BIT(4)50#define RV3029_STATUS_PON BIT(5)51#define RV3029_STATUS_EEBUSY BIT(7)52#define RV3029_RST_CTRL 0x0453#define RV3029_RST_CTRL_SYSR BIT(4)54#define RV3029_CONTROL_SECTION_LEN 0x0555 56/* watch section */57#define RV3029_W_SEC 0x0858#define RV3029_W_MINUTES 0x0959#define RV3029_W_HOURS 0x0A60#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */61#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */62#define RV3029_W_DATE 0x0B63#define RV3029_W_DAYS 0x0C64#define RV3029_W_MONTHS 0x0D65#define RV3029_W_YEARS 0x0E66#define RV3029_WATCH_SECTION_LEN 0x0767 68/* alarm section */69#define RV3029_A_SC 0x1070#define RV3029_A_MN 0x1171#define RV3029_A_HR 0x1272#define RV3029_A_DT 0x1373#define RV3029_A_DW 0x1474#define RV3029_A_MO 0x1575#define RV3029_A_YR 0x1676#define RV3029_A_AE_X BIT(7)77#define RV3029_ALARM_SECTION_LEN 0x0778 79/* timer section */80#define RV3029_TIMER_LOW 0x1881#define RV3029_TIMER_HIGH 0x1982 83/* temperature section */84#define RV3029_TEMP_PAGE 0x2085 86/* eeprom data section */87#define RV3029_E2P_EEDATA1 0x2888#define RV3029_E2P_EEDATA2 0x2989#define RV3029_E2PDATA_SECTION_LEN 0x0290 91/* eeprom control section */92#define RV3029_CONTROL_E2P_EECTRL 0x3093#define RV3029_EECTRL_THP BIT(0) /* temp scan interval */94#define RV3029_EECTRL_THE BIT(1) /* thermometer enable */95#define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */96#define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */97#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */98#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */99#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */100#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */101#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\102 RV3029_TRICKLE_5K |\103 RV3029_TRICKLE_20K |\104 RV3029_TRICKLE_80K)105#define RV3029_TRICKLE_SHIFT 4106#define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */107#define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */108#define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */109#define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */110#define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */111 112/* user ram section */113#define RV3029_RAM_PAGE 0x38114#define RV3029_RAM_SECTION_LEN 8115 116struct rv3029_data {117 struct device *dev;118 struct rtc_device *rtc;119 struct regmap *regmap;120 int irq;121};122 123static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)124{125 unsigned int sr;126 int i, ret;127 128 for (i = 100; i > 0; i--) {129 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);130 if (ret < 0)131 break;132 if (!(sr & RV3029_STATUS_EEBUSY))133 break;134 usleep_range(1000, 10000);135 }136 if (i <= 0) {137 dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");138 return -ETIMEDOUT;139 }140 141 return ret;142}143 144static int rv3029_eeprom_exit(struct rv3029_data *rv3029)145{146 /* Re-enable eeprom refresh */147 return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,148 RV3029_ONOFF_CTRL_EERE,149 RV3029_ONOFF_CTRL_EERE);150}151 152static int rv3029_eeprom_enter(struct rv3029_data *rv3029)153{154 unsigned int sr;155 int ret;156 157 /* Check whether we are in the allowed voltage range. */158 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);159 if (ret < 0)160 return ret;161 if (sr & RV3029_STATUS_VLOW2)162 return -ENODEV;163 if (sr & RV3029_STATUS_VLOW1) {164 /* We clear the bits and retry once just in case165 * we had a brown out in early startup.166 */167 ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,168 RV3029_STATUS_VLOW1, 0);169 if (ret < 0)170 return ret;171 usleep_range(1000, 10000);172 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);173 if (ret < 0)174 return ret;175 if (sr & RV3029_STATUS_VLOW1) {176 dev_err(rv3029->dev,177 "Supply voltage is too low to safely access the EEPROM.\n");178 return -ENODEV;179 }180 }181 182 /* Disable eeprom refresh. */183 ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,184 RV3029_ONOFF_CTRL_EERE, 0);185 if (ret < 0)186 return ret;187 188 /* Wait for any previous eeprom accesses to finish. */189 ret = rv3029_eeprom_busywait(rv3029);190 if (ret < 0)191 rv3029_eeprom_exit(rv3029);192 193 return ret;194}195 196static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg,197 u8 buf[], size_t len)198{199 int ret, err;200 201 err = rv3029_eeprom_enter(rv3029);202 if (err < 0)203 return err;204 205 ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);206 207 err = rv3029_eeprom_exit(rv3029);208 if (err < 0)209 return err;210 211 return ret;212}213 214static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg,215 u8 const buf[], size_t len)216{217 unsigned int tmp;218 int ret, err;219 size_t i;220 221 err = rv3029_eeprom_enter(rv3029);222 if (err < 0)223 return err;224 225 for (i = 0; i < len; i++, reg++) {226 ret = regmap_read(rv3029->regmap, reg, &tmp);227 if (ret < 0)228 break;229 if (tmp != buf[i]) {230 tmp = buf[i];231 ret = regmap_write(rv3029->regmap, reg, tmp);232 if (ret < 0)233 break;234 }235 ret = rv3029_eeprom_busywait(rv3029);236 if (ret < 0)237 break;238 }239 240 err = rv3029_eeprom_exit(rv3029);241 if (err < 0)242 return err;243 244 return ret;245}246 247static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029,248 u8 reg, u8 mask, u8 set)249{250 u8 buf;251 int ret;252 253 ret = rv3029_eeprom_read(rv3029, reg, &buf, 1);254 if (ret < 0)255 return ret;256 buf &= ~mask;257 buf |= set & mask;258 ret = rv3029_eeprom_write(rv3029, reg, &buf, 1);259 if (ret < 0)260 return ret;261 262 return 0;263}264 265static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)266{267 struct device *dev = dev_id;268 struct rv3029_data *rv3029 = dev_get_drvdata(dev);269 unsigned int flags, controls;270 unsigned long events = 0;271 int ret;272 273 rtc_lock(rv3029->rtc);274 275 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);276 if (ret) {277 dev_warn(dev, "Read IRQ Control Register error %d\n", ret);278 rtc_unlock(rv3029->rtc);279 return IRQ_NONE;280 }281 282 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);283 if (ret) {284 dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);285 rtc_unlock(rv3029->rtc);286 return IRQ_NONE;287 }288 289 if (flags & RV3029_IRQ_FLAGS_AF) {290 flags &= ~RV3029_IRQ_FLAGS_AF;291 controls &= ~RV3029_IRQ_CTRL_AIE;292 events |= RTC_AF;293 }294 295 if (events) {296 rtc_update_irq(rv3029->rtc, 1, events);297 regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);298 regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);299 }300 rtc_unlock(rv3029->rtc);301 302 return IRQ_HANDLED;303}304 305static int rv3029_read_time(struct device *dev, struct rtc_time *tm)306{307 struct rv3029_data *rv3029 = dev_get_drvdata(dev);308 unsigned int sr;309 int ret;310 u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };311 312 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);313 if (ret < 0)314 return ret;315 316 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))317 return -EINVAL;318 319 ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,320 RV3029_WATCH_SECTION_LEN);321 if (ret < 0)322 return ret;323 324 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);325 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);326 327 /* HR field has a more complex interpretation */328 {329 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];330 331 if (_hr & RV3029_REG_HR_12_24) {332 /* 12h format */333 tm->tm_hour = bcd2bin(_hr & 0x1f);334 if (_hr & RV3029_REG_HR_PM) /* PM flag set */335 tm->tm_hour += 12;336 } else /* 24h format */337 tm->tm_hour = bcd2bin(_hr & 0x3f);338 }339 340 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);341 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;342 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;343 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;344 345 return 0;346}347 348static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)349{350 struct rv3029_data *rv3029 = dev_get_drvdata(dev);351 struct rtc_time *const tm = &alarm->time;352 unsigned int controls, flags;353 int ret;354 u8 regs[8];355 356 ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,357 RV3029_ALARM_SECTION_LEN);358 if (ret < 0)359 return ret;360 361 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);362 if (ret)363 return ret;364 365 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);366 if (ret < 0)367 return ret;368 369 tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);370 tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);371 tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);372 tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);373 tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;374 tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;375 tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;376 377 alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);378 alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;379 380 return 0;381}382 383static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)384{385 struct rv3029_data *rv3029 = dev_get_drvdata(dev);386 387 return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,388 RV3029_IRQ_CTRL_AIE,389 enable ? RV3029_IRQ_CTRL_AIE : 0);390}391 392static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)393{394 struct rv3029_data *rv3029 = dev_get_drvdata(dev);395 struct rtc_time *const tm = &alarm->time;396 int ret;397 u8 regs[8];398 399 /* Activate all the alarms with AE_x bit */400 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;401 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;402 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)403 | RV3029_A_AE_X;404 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)405 | RV3029_A_AE_X;406 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)407 | RV3029_A_AE_X;408 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)409 | RV3029_A_AE_X;410 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))411 | RV3029_A_AE_X;412 413 /* Write the alarm */414 ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,415 RV3029_ALARM_SECTION_LEN);416 if (ret < 0)417 return ret;418 419 return rv3029_alarm_irq_enable(dev, alarm->enabled);420}421 422static int rv3029_set_time(struct device *dev, struct rtc_time *tm)423{424 struct rv3029_data *rv3029 = dev_get_drvdata(dev);425 u8 regs[8];426 int ret;427 428 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);429 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);430 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);431 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);432 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);433 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;434 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);435 436 ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,437 RV3029_WATCH_SECTION_LEN);438 if (ret < 0)439 return ret;440 441 /* clear PON and VLOW2 bits */442 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,443 RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0);444}445 446static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)447{448 struct rv3029_data *rv3029 = dev_get_drvdata(dev);449 unsigned long vl = 0;450 int sr, ret = 0;451 452 switch (cmd) {453 case RTC_VL_READ:454 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);455 if (ret < 0)456 return ret;457 458 if (sr & RV3029_STATUS_VLOW1)459 vl = RTC_VL_ACCURACY_LOW;460 461 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))462 vl |= RTC_VL_DATA_INVALID;463 464 return put_user(vl, (unsigned int __user *)arg);465 466 case RTC_VL_CLR:467 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,468 RV3029_STATUS_VLOW1, 0);469 470 default:471 return -ENOIOCTLCMD;472 }473}474 475static int rv3029_nvram_write(void *priv, unsigned int offset, void *val,476 size_t bytes)477{478 return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);479}480 481static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,482 size_t bytes)483{484 return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);485}486 487static const struct rv3029_trickle_tab_elem {488 u32 r; /* resistance in ohms */489 u8 conf; /* trickle config bits */490} rv3029_trickle_tab[] = {491 {492 .r = 1076,493 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |494 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,495 }, {496 .r = 1091,497 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |498 RV3029_TRICKLE_20K,499 }, {500 .r = 1137,501 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |502 RV3029_TRICKLE_80K,503 }, {504 .r = 1154,505 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,506 }, {507 .r = 1371,508 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |509 RV3029_TRICKLE_80K,510 }, {511 .r = 1395,512 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,513 }, {514 .r = 1472,515 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,516 }, {517 .r = 1500,518 .conf = RV3029_TRICKLE_1K,519 }, {520 .r = 3810,521 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |522 RV3029_TRICKLE_80K,523 }, {524 .r = 4000,525 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,526 }, {527 .r = 4706,528 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,529 }, {530 .r = 5000,531 .conf = RV3029_TRICKLE_5K,532 }, {533 .r = 16000,534 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,535 }, {536 .r = 20000,537 .conf = RV3029_TRICKLE_20K,538 }, {539 .r = 80000,540 .conf = RV3029_TRICKLE_80K,541 },542};543 544static void rv3029_trickle_config(struct device *dev)545{546 struct rv3029_data *rv3029 = dev_get_drvdata(dev);547 struct device_node *of_node = dev->of_node;548 const struct rv3029_trickle_tab_elem *elem;549 int i, err;550 u32 ohms;551 u8 trickle_set_bits;552 553 if (!of_node)554 return;555 556 /* Configure the trickle charger. */557 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);558 if (err) {559 /* Disable trickle charger. */560 trickle_set_bits = 0;561 } else {562 /* Enable trickle charger. */563 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {564 elem = &rv3029_trickle_tab[i];565 if (elem->r >= ohms)566 break;567 }568 trickle_set_bits = elem->conf;569 dev_info(dev,570 "Trickle charger enabled at %d ohms resistance.\n",571 elem->r);572 }573 err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,574 RV3029_TRICKLE_MASK,575 trickle_set_bits);576 if (err < 0)577 dev_err(dev, "Failed to update trickle charger config\n");578}579 580#ifdef CONFIG_RTC_DRV_RV3029_HWMON581 582static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)583{584 unsigned int temp;585 int ret;586 587 ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);588 if (ret < 0)589 return ret;590 591 *temp_mC = ((int)temp - 60) * 1000;592 593 return 0;594}595 596static ssize_t rv3029_hwmon_show_temp(struct device *dev,597 struct device_attribute *attr,598 char *buf)599{600 struct rv3029_data *rv3029 = dev_get_drvdata(dev);601 int ret, temp_mC;602 603 ret = rv3029_read_temp(rv3029, &temp_mC);604 if (ret < 0)605 return ret;606 607 return sprintf(buf, "%d\n", temp_mC);608}609 610static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,611 struct device_attribute *attr,612 const char *buf,613 size_t count)614{615 struct rv3029_data *rv3029 = dev_get_drvdata(dev);616 unsigned int th_set_bits = 0;617 unsigned long interval_ms;618 int ret;619 620 ret = kstrtoul(buf, 10, &interval_ms);621 if (ret < 0)622 return ret;623 624 if (interval_ms != 0) {625 th_set_bits |= RV3029_EECTRL_THE;626 if (interval_ms >= 16000)627 th_set_bits |= RV3029_EECTRL_THP;628 }629 ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,630 RV3029_EECTRL_THE | RV3029_EECTRL_THP,631 th_set_bits);632 if (ret < 0)633 return ret;634 635 return count;636}637 638static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,639 struct device_attribute *attr,640 char *buf)641{642 struct rv3029_data *rv3029 = dev_get_drvdata(dev);643 int ret, interval_ms;644 u8 eectrl;645 646 ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,647 &eectrl, 1);648 if (ret < 0)649 return ret;650 651 if (eectrl & RV3029_EECTRL_THE) {652 if (eectrl & RV3029_EECTRL_THP)653 interval_ms = 16000;654 else655 interval_ms = 1000;656 } else {657 interval_ms = 0;658 }659 660 return sprintf(buf, "%d\n", interval_ms);661}662 663static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,664 NULL, 0);665static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,666 rv3029_hwmon_show_update_interval,667 rv3029_hwmon_set_update_interval, 0);668 669static struct attribute *rv3029_hwmon_attrs[] = {670 &sensor_dev_attr_temp1_input.dev_attr.attr,671 &sensor_dev_attr_update_interval.dev_attr.attr,672 NULL,673};674ATTRIBUTE_GROUPS(rv3029_hwmon);675 676static void rv3029_hwmon_register(struct device *dev, const char *name)677{678 struct rv3029_data *rv3029 = dev_get_drvdata(dev);679 struct device *hwmon_dev;680 681 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,682 rv3029_hwmon_groups);683 if (IS_ERR(hwmon_dev)) {684 dev_warn(dev, "unable to register hwmon device %ld\n",685 PTR_ERR(hwmon_dev));686 }687}688 689#else /* CONFIG_RTC_DRV_RV3029_HWMON */690 691static void rv3029_hwmon_register(struct device *dev, const char *name)692{693}694 695#endif /* CONFIG_RTC_DRV_RV3029_HWMON */696 697static const struct rtc_class_ops rv3029_rtc_ops = {698 .read_time = rv3029_read_time,699 .set_time = rv3029_set_time,700 .ioctl = rv3029_ioctl,701 .read_alarm = rv3029_read_alarm,702 .set_alarm = rv3029_set_alarm,703 .alarm_irq_enable = rv3029_alarm_irq_enable,704};705 706static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,707 const char *name)708{709 struct rv3029_data *rv3029;710 struct nvmem_config nvmem_cfg = {711 .name = "rv3029_nvram",712 .word_size = 1,713 .stride = 1,714 .size = RV3029_RAM_SECTION_LEN,715 .type = NVMEM_TYPE_BATTERY_BACKED,716 .reg_read = rv3029_nvram_read,717 .reg_write = rv3029_nvram_write,718 };719 int rc = 0;720 721 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);722 if (!rv3029)723 return -ENOMEM;724 725 rv3029->regmap = regmap;726 rv3029->irq = irq;727 rv3029->dev = dev;728 dev_set_drvdata(dev, rv3029);729 730 rv3029_trickle_config(dev);731 rv3029_hwmon_register(dev, name);732 733 rv3029->rtc = devm_rtc_allocate_device(dev);734 if (IS_ERR(rv3029->rtc))735 return PTR_ERR(rv3029->rtc);736 737 if (rv3029->irq > 0) {738 unsigned long irqflags = IRQF_TRIGGER_LOW;739 740 if (dev_fwnode(dev))741 irqflags = 0;742 743 rc = devm_request_threaded_irq(dev, rv3029->irq,744 NULL, rv3029_handle_irq,745 irqflags | IRQF_ONESHOT,746 "rv3029", dev);747 if (rc) {748 dev_warn(dev, "unable to request IRQ, alarms disabled\n");749 rv3029->irq = 0;750 }751 }752 if (!rv3029->irq)753 clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features);754 755 rv3029->rtc->ops = &rv3029_rtc_ops;756 rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;757 rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;758 759 rc = devm_rtc_register_device(rv3029->rtc);760 if (rc)761 return rc;762 763 nvmem_cfg.priv = rv3029->regmap;764 devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);765 766 return 0;767}768 769static const struct regmap_range rv3029_holes_range[] = {770 regmap_reg_range(0x05, 0x07),771 regmap_reg_range(0x0f, 0x0f),772 regmap_reg_range(0x17, 0x17),773 regmap_reg_range(0x1a, 0x1f),774 regmap_reg_range(0x21, 0x27),775 regmap_reg_range(0x34, 0x37),776};777 778static const struct regmap_access_table rv3029_regs = {779 .no_ranges = rv3029_holes_range,780 .n_no_ranges = ARRAY_SIZE(rv3029_holes_range),781};782 783static const struct regmap_config config = {784 .reg_bits = 8,785 .val_bits = 8,786 .rd_table = &rv3029_regs,787 .wr_table = &rv3029_regs,788 .max_register = 0x3f,789};790 791#if IS_ENABLED(CONFIG_I2C)792 793static int rv3029_i2c_probe(struct i2c_client *client)794{795 struct regmap *regmap;796 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |797 I2C_FUNC_SMBUS_BYTE)) {798 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");799 return -ENODEV;800 }801 802 regmap = devm_regmap_init_i2c(client, &config);803 if (IS_ERR(regmap))804 return PTR_ERR(regmap);805 806 return rv3029_probe(&client->dev, regmap, client->irq, client->name);807}808 809static const struct i2c_device_id rv3029_id[] = {810 { "rv3029" },811 { "rv3029c2" },812 { }813};814MODULE_DEVICE_TABLE(i2c, rv3029_id);815 816static const __maybe_unused struct of_device_id rv3029_of_match[] = {817 { .compatible = "microcrystal,rv3029" },818 { }819};820MODULE_DEVICE_TABLE(of, rv3029_of_match);821 822static struct i2c_driver rv3029_driver = {823 .driver = {824 .name = "rv3029",825 .of_match_table = of_match_ptr(rv3029_of_match),826 },827 .probe = rv3029_i2c_probe,828 .id_table = rv3029_id,829};830 831static int __init rv3029_register_driver(void)832{833 return i2c_add_driver(&rv3029_driver);834}835 836static void rv3029_unregister_driver(void)837{838 i2c_del_driver(&rv3029_driver);839}840 841#else842 843static int __init rv3029_register_driver(void)844{845 return 0;846}847 848static void rv3029_unregister_driver(void)849{850}851 852#endif853 854#if IS_ENABLED(CONFIG_SPI_MASTER)855 856static int rv3049_probe(struct spi_device *spi)857{858 struct regmap *regmap;859 860 regmap = devm_regmap_init_spi(spi, &config);861 if (IS_ERR(regmap))862 return PTR_ERR(regmap);863 864 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");865}866 867static struct spi_driver rv3049_driver = {868 .driver = {869 .name = "rv3049",870 },871 .probe = rv3049_probe,872};873 874static int __init rv3049_register_driver(void)875{876 return spi_register_driver(&rv3049_driver);877}878 879static void __exit rv3049_unregister_driver(void)880{881 spi_unregister_driver(&rv3049_driver);882}883 884#else885 886static int __init rv3049_register_driver(void)887{888 return 0;889}890 891static void __exit rv3049_unregister_driver(void)892{893}894 895#endif896 897static int __init rv30x9_init(void)898{899 int ret;900 901 ret = rv3029_register_driver();902 if (ret)903 return ret;904 905 ret = rv3049_register_driver();906 if (ret)907 rv3029_unregister_driver();908 909 return ret;910}911module_init(rv30x9_init)912 913static void __exit rv30x9_exit(void)914{915 rv3049_unregister_driver();916 rv3029_unregister_driver();917}918module_exit(rv30x9_exit)919 920MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");921MODULE_AUTHOR("Michael Buesch <m@bues.ch>");922MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");923MODULE_LICENSE("GPL");924MODULE_ALIAS("spi:rv3049");925