989 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Intersil ISL1208 rtc class driver4 *5 * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org>6 */7 8#include <linux/bcd.h>9#include <linux/clk.h>10#include <linux/delay.h>11#include <linux/i2c.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/of_irq.h>15#include <linux/rtc.h>16 17/* Register map */18/* rtc section */19#define ISL1208_REG_SC 0x0020#define ISL1208_REG_MN 0x0121#define ISL1208_REG_HR 0x0222#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */23#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */24#define ISL1208_REG_DT 0x0325#define ISL1208_REG_MO 0x0426#define ISL1208_REG_YR 0x0527#define ISL1208_REG_DW 0x0628#define ISL1208_RTC_SECTION_LEN 729 30/* control/status section */31#define ISL1208_REG_SR 0x0732#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */33#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */34#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */35#define ISL1208_REG_SR_EVT (1<<3) /* event */36#define ISL1208_REG_SR_ALM (1<<2) /* alarm */37#define ISL1208_REG_SR_BAT (1<<1) /* battery */38#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */39#define ISL1208_REG_INT 0x0840#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */41#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */42#define ISL1219_REG_EV 0x0943#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */44#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */45#define ISL1208_REG_ATR 0x0a46#define ISL1208_REG_DTR 0x0b47 48/* alarm section */49#define ISL1208_REG_SCA 0x0c50#define ISL1208_REG_MNA 0x0d51#define ISL1208_REG_HRA 0x0e52#define ISL1208_REG_DTA 0x0f53#define ISL1208_REG_MOA 0x1054#define ISL1208_REG_DWA 0x1155#define ISL1208_ALARM_SECTION_LEN 656 57/* user section */58#define ISL1208_REG_USR1 0x1259#define ISL1208_REG_USR2 0x1360#define ISL1208_USR_SECTION_LEN 261 62/* event section */63#define ISL1219_REG_SCT 0x1464#define ISL1219_REG_MNT 0x1565#define ISL1219_REG_HRT 0x1666#define ISL1219_REG_DTT 0x1767#define ISL1219_REG_MOT 0x1868#define ISL1219_REG_YRT 0x1969#define ISL1219_EVT_SECTION_LEN 670 71static struct i2c_driver isl1208_driver;72 73/* Chip capabilities table */74struct isl1208_config {75 unsigned int nvmem_length;76 unsigned has_tamper:1;77 unsigned has_timestamp:1;78 unsigned has_inverted_osc_bit:1;79};80 81static const struct isl1208_config config_isl1208 = {82 .nvmem_length = 2,83 .has_tamper = false,84 .has_timestamp = false85};86 87static const struct isl1208_config config_isl1209 = {88 .nvmem_length = 2,89 .has_tamper = true,90 .has_timestamp = false91};92 93static const struct isl1208_config config_isl1218 = {94 .nvmem_length = 8,95 .has_tamper = false,96 .has_timestamp = false97};98 99static const struct isl1208_config config_isl1219 = {100 .nvmem_length = 2,101 .has_tamper = true,102 .has_timestamp = true103};104 105static const struct isl1208_config config_raa215300_a0 = {106 .nvmem_length = 2,107 .has_tamper = false,108 .has_timestamp = false,109 .has_inverted_osc_bit = true110};111 112static const struct i2c_device_id isl1208_id[] = {113 { "isl1208", .driver_data = (kernel_ulong_t)&config_isl1208 },114 { "isl1209", .driver_data = (kernel_ulong_t)&config_isl1209 },115 { "isl1218", .driver_data = (kernel_ulong_t)&config_isl1218 },116 { "isl1219", .driver_data = (kernel_ulong_t)&config_isl1219 },117 { "raa215300_a0", .driver_data = (kernel_ulong_t)&config_raa215300_a0 },118 { }119};120MODULE_DEVICE_TABLE(i2c, isl1208_id);121 122static const __maybe_unused struct of_device_id isl1208_of_match[] = {123 { .compatible = "isil,isl1208", .data = &config_isl1208 },124 { .compatible = "isil,isl1209", .data = &config_isl1209 },125 { .compatible = "isil,isl1218", .data = &config_isl1218 },126 { .compatible = "isil,isl1219", .data = &config_isl1219 },127 { }128};129MODULE_DEVICE_TABLE(of, isl1208_of_match);130 131/* Device state */132struct isl1208_state {133 struct nvmem_config nvmem_config;134 struct rtc_device *rtc;135 const struct isl1208_config *config;136};137 138/* block read */139static int140isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],141 unsigned len)142{143 int ret;144 145 WARN_ON(reg > ISL1219_REG_YRT);146 WARN_ON(reg + len > ISL1219_REG_YRT + 1);147 148 ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);149 return (ret < 0) ? ret : 0;150}151 152/* block write */153static int154isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],155 unsigned len)156{157 int ret;158 159 WARN_ON(reg > ISL1219_REG_YRT);160 WARN_ON(reg + len > ISL1219_REG_YRT + 1);161 162 ret = i2c_smbus_write_i2c_block_data(client, reg, len, buf);163 return (ret < 0) ? ret : 0;164}165 166/* simple check to see whether we have a isl1208 */167static int168isl1208_i2c_validate_client(struct i2c_client *client)169{170 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };171 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {172 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8173 };174 int i;175 int ret;176 177 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);178 if (ret < 0)179 return ret;180 181 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {182 if (regs[i] & zero_mask[i]) /* check if bits are cleared */183 return -ENODEV;184 }185 186 return 0;187}188 189static int isl1208_set_xtoscb(struct i2c_client *client, int sr, int xtosb_val)190{191 /* Do nothing if bit is already set to desired value */192 if (!!(sr & ISL1208_REG_SR_XTOSCB) == xtosb_val)193 return 0;194 195 if (xtosb_val)196 sr |= ISL1208_REG_SR_XTOSCB;197 else198 sr &= ~ISL1208_REG_SR_XTOSCB;199 200 return i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);201}202 203static int204isl1208_i2c_get_sr(struct i2c_client *client)205{206 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR);207}208 209static int210isl1208_i2c_get_atr(struct i2c_client *client)211{212 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);213 if (atr < 0)214 return atr;215 216 /* The 6bit value in the ATR register controls the load217 * capacitance C_load * in steps of 0.25pF218 *219 * bit (1<<5) of the ATR register is inverted220 *221 * C_load(ATR=0x20) = 4.50pF222 * C_load(ATR=0x00) = 12.50pF223 * C_load(ATR=0x1f) = 20.25pF224 *225 */226 227 atr &= 0x3f; /* mask out lsb */228 atr ^= 1 << 5; /* invert 6th bit */229 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */230 231 return atr;232}233 234/* returns adjustment value + 100 */235static int236isl1208_i2c_get_dtr(struct i2c_client *client)237{238 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);239 if (dtr < 0)240 return -EIO;241 242 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */243 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);244 245 return dtr + 100;246}247 248static int249isl1208_i2c_get_usr(struct i2c_client *client)250{251 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };252 int ret;253 254 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,255 ISL1208_USR_SECTION_LEN);256 if (ret < 0)257 return ret;258 259 return (buf[1] << 8) | buf[0];260}261 262static int263isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)264{265 u8 buf[ISL1208_USR_SECTION_LEN];266 267 buf[0] = usr & 0xff;268 buf[1] = (usr >> 8) & 0xff;269 270 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,271 ISL1208_USR_SECTION_LEN);272}273 274static int275isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)276{277 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);278 279 if (icr < 0) {280 dev_err(&client->dev, "%s: reading INT failed\n", __func__);281 return icr;282 }283 284 if (enable)285 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;286 else287 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);288 289 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);290 if (icr < 0) {291 dev_err(&client->dev, "%s: writing INT failed\n", __func__);292 return icr;293 }294 295 return 0;296}297 298static int299isl1208_rtc_proc(struct device *dev, struct seq_file *seq)300{301 struct i2c_client *const client = to_i2c_client(dev);302 int sr, dtr, atr, usr;303 304 sr = isl1208_i2c_get_sr(client);305 if (sr < 0) {306 dev_err(&client->dev, "%s: reading SR failed\n", __func__);307 return sr;308 }309 310 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",311 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",312 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",313 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",314 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",315 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",316 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);317 318 seq_printf(seq, "batt_status\t: %s\n",319 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");320 321 dtr = isl1208_i2c_get_dtr(client);322 if (dtr >= 0)323 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100);324 325 atr = isl1208_i2c_get_atr(client);326 if (atr >= 0)327 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",328 atr >> 2, (atr & 0x3) * 25);329 330 usr = isl1208_i2c_get_usr(client);331 if (usr >= 0)332 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);333 334 return 0;335}336 337static int338isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)339{340 int sr;341 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };342 343 sr = isl1208_i2c_get_sr(client);344 if (sr < 0) {345 dev_err(&client->dev, "%s: reading SR failed\n", __func__);346 return -EIO;347 }348 349 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);350 if (sr < 0) {351 dev_err(&client->dev, "%s: reading RTC section failed\n",352 __func__);353 return sr;354 }355 356 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);357 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);358 359 /* HR field has a more complex interpretation */360 {361 const u8 _hr = regs[ISL1208_REG_HR];362 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */363 tm->tm_hour = bcd2bin(_hr & 0x3f);364 else {365 /* 12h format */366 tm->tm_hour = bcd2bin(_hr & 0x1f);367 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */368 tm->tm_hour += 12;369 }370 }371 372 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);373 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */374 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;375 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);376 377 return 0;378}379 380static int381isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)382{383 struct rtc_time *const tm = &alarm->time;384 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };385 int icr, yr, sr = isl1208_i2c_get_sr(client);386 387 if (sr < 0) {388 dev_err(&client->dev, "%s: reading SR failed\n", __func__);389 return sr;390 }391 392 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,393 ISL1208_ALARM_SECTION_LEN);394 if (sr < 0) {395 dev_err(&client->dev, "%s: reading alarm section failed\n",396 __func__);397 return sr;398 }399 400 /* MSB of each alarm register is an enable bit */401 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);402 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);403 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);404 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);405 tm->tm_mon =406 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;407 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);408 409 /* The alarm doesn't store the year so get it from the rtc section */410 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);411 if (yr < 0) {412 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);413 return yr;414 }415 tm->tm_year = bcd2bin(yr) + 100;416 417 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);418 if (icr < 0) {419 dev_err(&client->dev, "%s: reading INT failed\n", __func__);420 return icr;421 }422 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);423 424 return 0;425}426 427static int428isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)429{430 struct rtc_time *alarm_tm = &alarm->time;431 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };432 const int offs = ISL1208_REG_SCA;433 struct rtc_time rtc_tm;434 int err, enable;435 436 err = isl1208_i2c_read_time(client, &rtc_tm);437 if (err)438 return err;439 440 /* If the alarm time is before the current time disable the alarm */441 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0)442 enable = 0x00;443 else444 enable = 0x80;445 446 /* Program the alarm and enable it for each setting */447 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;448 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;449 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |450 ISL1208_REG_HR_MIL | enable;451 452 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;453 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;454 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;455 456 /* write ALARM registers */457 err = isl1208_i2c_set_regs(client, offs, regs,458 ISL1208_ALARM_SECTION_LEN);459 if (err < 0) {460 dev_err(&client->dev, "%s: writing ALARM section failed\n",461 __func__);462 return err;463 }464 465 err = isl1208_rtc_toggle_alarm(client, enable);466 if (err)467 return err;468 469 return 0;470}471 472static int473isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)474{475 return isl1208_i2c_read_time(to_i2c_client(dev), tm);476}477 478static int479isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)480{481 int sr;482 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };483 484 /* The clock has an 8 bit wide bcd-coded register (they never learn)485 * for the year. tm_year is an offset from 1900 and we are interested486 * in the 2000-2099 range, so any value less than 100 is invalid.487 */488 if (tm->tm_year < 100)489 return -EINVAL;490 491 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);492 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);493 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;494 495 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);496 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);497 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);498 499 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);500 501 sr = isl1208_i2c_get_sr(client);502 if (sr < 0) {503 dev_err(&client->dev, "%s: reading SR failed\n", __func__);504 return sr;505 }506 507 /* set WRTC */508 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,509 sr | ISL1208_REG_SR_WRTC);510 if (sr < 0) {511 dev_err(&client->dev, "%s: writing SR failed\n", __func__);512 return sr;513 }514 515 /* write RTC registers */516 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);517 if (sr < 0) {518 dev_err(&client->dev, "%s: writing RTC section failed\n",519 __func__);520 return sr;521 }522 523 /* clear WRTC again */524 sr = isl1208_i2c_get_sr(client);525 if (sr < 0) {526 dev_err(&client->dev, "%s: reading SR failed\n", __func__);527 return sr;528 }529 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,530 sr & ~ISL1208_REG_SR_WRTC);531 if (sr < 0) {532 dev_err(&client->dev, "%s: writing SR failed\n", __func__);533 return sr;534 }535 536 return 0;537}538 539static int540isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)541{542 return isl1208_i2c_set_time(to_i2c_client(dev), tm);543}544 545static int546isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)547{548 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);549}550 551static int552isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)553{554 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);555}556 557static ssize_t timestamp0_store(struct device *dev,558 struct device_attribute *attr,559 const char *buf, size_t count)560{561 struct i2c_client *client = to_i2c_client(dev->parent);562 int sr;563 564 sr = isl1208_i2c_get_sr(client);565 if (sr < 0) {566 dev_err(dev, "%s: reading SR failed\n", __func__);567 return sr;568 }569 570 sr &= ~ISL1208_REG_SR_EVT;571 572 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);573 if (sr < 0)574 dev_err(dev, "%s: writing SR failed\n",575 __func__);576 577 return count;578};579 580static ssize_t timestamp0_show(struct device *dev,581 struct device_attribute *attr, char *buf)582{583 struct i2c_client *client = to_i2c_client(dev->parent);584 u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };585 struct rtc_time tm;586 int sr;587 588 sr = isl1208_i2c_get_sr(client);589 if (sr < 0) {590 dev_err(dev, "%s: reading SR failed\n", __func__);591 return sr;592 }593 594 if (!(sr & ISL1208_REG_SR_EVT))595 return 0;596 597 sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs,598 ISL1219_EVT_SECTION_LEN);599 if (sr < 0) {600 dev_err(dev, "%s: reading event section failed\n",601 __func__);602 return 0;603 }604 605 /* MSB of each alarm register is an enable bit */606 tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f);607 tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f);608 tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f);609 tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f);610 tm.tm_mon =611 bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1;612 tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100;613 614 sr = rtc_valid_tm(&tm);615 if (sr)616 return sr;617 618 return sprintf(buf, "%llu\n",619 (unsigned long long)rtc_tm_to_time64(&tm));620};621 622static DEVICE_ATTR_RW(timestamp0);623 624static irqreturn_t625isl1208_rtc_interrupt(int irq, void *data)626{627 unsigned long timeout = jiffies + msecs_to_jiffies(1000);628 struct i2c_client *client = data;629 struct isl1208_state *isl1208 = i2c_get_clientdata(client);630 int handled = 0, sr, err;631 632 if (!isl1208->config->has_tamper) {633 /*634 * The INT# output is pulled low 250ms after the alarm is635 * triggered. After the INT# output is pulled low, it is low for636 * at least 250ms, even if the correct action is taken to clear637 * it. It is impossible to clear ALM if it is still active. The638 * host must wait for the RTC to progress past the alarm time639 * plus the 250ms delay before clearing ALM.640 */641 msleep(250);642 }643 644 /*645 * I2C reads get NAK'ed if we read straight away after an interrupt?646 * Using a mdelay/msleep didn't seem to help either, so we work around647 * this by continually trying to read the register for a short time.648 */649 while (1) {650 sr = isl1208_i2c_get_sr(client);651 if (sr >= 0)652 break;653 654 if (time_after(jiffies, timeout)) {655 dev_err(&client->dev, "%s: reading SR failed\n",656 __func__);657 return sr;658 }659 }660 661 if (sr & ISL1208_REG_SR_ALM) {662 dev_dbg(&client->dev, "alarm!\n");663 664 rtc_update_irq(isl1208->rtc, 1, RTC_IRQF | RTC_AF);665 666 /* Disable the alarm */667 err = isl1208_rtc_toggle_alarm(client, 0);668 if (err)669 return err;670 671 fsleep(275);672 673 /* Clear the alarm */674 sr &= ~ISL1208_REG_SR_ALM;675 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);676 if (sr < 0)677 dev_err(&client->dev, "%s: writing SR failed\n",678 __func__);679 else680 handled = 1;681 }682 683 if (isl1208->config->has_tamper && (sr & ISL1208_REG_SR_EVT)) {684 dev_warn(&client->dev, "event detected");685 handled = 1;686 if (isl1208->config->has_timestamp)687 sysfs_notify(&isl1208->rtc->dev.kobj, NULL,688 dev_attr_timestamp0.attr.name);689 }690 691 return handled ? IRQ_HANDLED : IRQ_NONE;692}693 694static const struct rtc_class_ops isl1208_rtc_ops = {695 .proc = isl1208_rtc_proc,696 .read_time = isl1208_rtc_read_time,697 .set_time = isl1208_rtc_set_time,698 .read_alarm = isl1208_rtc_read_alarm,699 .set_alarm = isl1208_rtc_set_alarm,700};701 702/* sysfs interface */703 704static ssize_t705isl1208_sysfs_show_atrim(struct device *dev,706 struct device_attribute *attr, char *buf)707{708 int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent));709 if (atr < 0)710 return atr;711 712 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);713}714 715static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);716 717static ssize_t718isl1208_sysfs_show_dtrim(struct device *dev,719 struct device_attribute *attr, char *buf)720{721 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent));722 if (dtr < 0)723 return dtr;724 725 return sprintf(buf, "%d ppm\n", dtr - 100);726}727 728static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);729 730static ssize_t731isl1208_sysfs_show_usr(struct device *dev,732 struct device_attribute *attr, char *buf)733{734 int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent));735 if (usr < 0)736 return usr;737 738 return sprintf(buf, "0x%.4x\n", usr);739}740 741static ssize_t742isl1208_sysfs_store_usr(struct device *dev,743 struct device_attribute *attr,744 const char *buf, size_t count)745{746 int usr = -1;747 748 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {749 if (sscanf(buf, "%x", &usr) != 1)750 return -EINVAL;751 } else {752 if (sscanf(buf, "%d", &usr) != 1)753 return -EINVAL;754 }755 756 if (usr < 0 || usr > 0xffff)757 return -EINVAL;758 759 if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr))760 return -EIO;761 762 return count;763}764 765static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,766 isl1208_sysfs_store_usr);767 768static struct attribute *isl1208_rtc_attrs[] = {769 &dev_attr_atrim.attr,770 &dev_attr_dtrim.attr,771 &dev_attr_usr.attr,772 NULL773};774 775static const struct attribute_group isl1208_rtc_sysfs_files = {776 .attrs = isl1208_rtc_attrs,777};778 779static struct attribute *isl1219_rtc_attrs[] = {780 &dev_attr_timestamp0.attr,781 NULL782};783 784static const struct attribute_group isl1219_rtc_sysfs_files = {785 .attrs = isl1219_rtc_attrs,786};787 788static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf,789 size_t count)790{791 struct isl1208_state *isl1208 = priv;792 struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);793 794 /* nvmem sanitizes offset/count for us, but count==0 is possible */795 if (!count)796 return count;797 798 return isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf,799 count);800}801 802static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf,803 size_t count)804{805 struct isl1208_state *isl1208 = priv;806 struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);807 808 /* nvmem sanitizes off/count for us, but count==0 is possible */809 if (!count)810 return count;811 812 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf,813 count);814}815 816static const struct nvmem_config isl1208_nvmem_config = {817 .name = "isl1208_nvram",818 .word_size = 1,819 .stride = 1,820 /* .size from chip specific config */821 .reg_read = isl1208_nvmem_read,822 .reg_write = isl1208_nvmem_write,823};824 825static int isl1208_setup_irq(struct i2c_client *client, int irq)826{827 int rc = devm_request_threaded_irq(&client->dev, irq, NULL,828 isl1208_rtc_interrupt,829 IRQF_SHARED | IRQF_ONESHOT,830 isl1208_driver.driver.name,831 client);832 if (!rc) {833 device_init_wakeup(&client->dev, 1);834 enable_irq_wake(irq);835 } else {836 dev_err(&client->dev,837 "Unable to request irq %d, no alarm support\n",838 irq);839 }840 return rc;841}842 843static int844isl1208_clk_present(struct i2c_client *client, const char *name)845{846 struct clk *clk;847 848 clk = devm_clk_get_optional(&client->dev, name);849 if (IS_ERR(clk))850 return PTR_ERR(clk);851 852 return !!clk;853}854 855static int856isl1208_probe(struct i2c_client *client)857{858 struct isl1208_state *isl1208;859 int evdet_irq = -1;860 int xtosb_val = 0;861 int rc = 0;862 int sr;863 864 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))865 return -ENODEV;866 867 if (isl1208_i2c_validate_client(client) < 0)868 return -ENODEV;869 870 /* Allocate driver state, point i2c client data to it */871 isl1208 = devm_kzalloc(&client->dev, sizeof(*isl1208), GFP_KERNEL);872 if (!isl1208)873 return -ENOMEM;874 i2c_set_clientdata(client, isl1208);875 876 /* Determine which chip we have */877 isl1208->config = i2c_get_match_data(client);878 if (!isl1208->config)879 return -ENODEV;880 881 rc = isl1208_clk_present(client, "xin");882 if (rc < 0)883 return rc;884 885 if (!rc) {886 rc = isl1208_clk_present(client, "clkin");887 if (rc < 0)888 return rc;889 890 if (rc)891 xtosb_val = 1;892 }893 894 isl1208->rtc = devm_rtc_allocate_device(&client->dev);895 if (IS_ERR(isl1208->rtc))896 return PTR_ERR(isl1208->rtc);897 898 isl1208->rtc->ops = &isl1208_rtc_ops;899 900 /* Setup nvmem configuration in driver state struct */901 isl1208->nvmem_config = isl1208_nvmem_config;902 isl1208->nvmem_config.size = isl1208->config->nvmem_length;903 isl1208->nvmem_config.priv = isl1208;904 905 sr = isl1208_i2c_get_sr(client);906 if (sr < 0) {907 dev_err(&client->dev, "reading status failed\n");908 return sr;909 }910 911 if (isl1208->config->has_inverted_osc_bit)912 xtosb_val = !xtosb_val;913 914 rc = isl1208_set_xtoscb(client, sr, xtosb_val);915 if (rc)916 return rc;917 918 if (sr & ISL1208_REG_SR_RTCF)919 dev_warn(&client->dev, "rtc power failure detected, "920 "please set clock.\n");921 922 if (isl1208->config->has_tamper) {923 struct device_node *np = client->dev.of_node;924 u32 evienb;925 926 rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);927 if (rc < 0) {928 dev_err(&client->dev, "failed to read EV reg\n");929 return rc;930 }931 rc |= ISL1219_REG_EV_EVEN;932 if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {933 if (evienb)934 rc |= ISL1219_REG_EV_EVIENB;935 else936 rc &= ~ISL1219_REG_EV_EVIENB;937 }938 rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);939 if (rc < 0) {940 dev_err(&client->dev, "could not enable tamper detection\n");941 return rc;942 }943 evdet_irq = of_irq_get_byname(np, "evdet");944 }945 if (isl1208->config->has_timestamp) {946 rc = rtc_add_group(isl1208->rtc, &isl1219_rtc_sysfs_files);947 if (rc)948 return rc;949 }950 951 rc = rtc_add_group(isl1208->rtc, &isl1208_rtc_sysfs_files);952 if (rc)953 return rc;954 955 if (client->irq > 0) {956 rc = isl1208_setup_irq(client, client->irq);957 if (rc)958 return rc;959 } else {960 clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, isl1208->rtc->features);961 }962 963 if (evdet_irq > 0 && evdet_irq != client->irq)964 rc = isl1208_setup_irq(client, evdet_irq);965 if (rc)966 return rc;967 968 rc = devm_rtc_nvmem_register(isl1208->rtc, &isl1208->nvmem_config);969 if (rc)970 return rc;971 972 return devm_rtc_register_device(isl1208->rtc);973}974 975static struct i2c_driver isl1208_driver = {976 .driver = {977 .name = "rtc-isl1208",978 .of_match_table = of_match_ptr(isl1208_of_match),979 },980 .probe = isl1208_probe,981 .id_table = isl1208_id,982};983 984module_i2c_driver(isl1208_driver);985 986MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");987MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");988MODULE_LICENSE("GPL");989