1/* 2 * Intersil ISL1208 rtc class driver 3 * 4 * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 * 11 */ 12 13#include <linux/module.h> 14#include <linux/i2c.h> 15#include <linux/bcd.h> 16#include <linux/rtc.h> 17 18#define DRV_VERSION "0.3" 19 20/* Register map */ 21/* rtc section */ 22#define ISL1208_REG_SC 0x00 23#define ISL1208_REG_MN 0x01 24#define ISL1208_REG_HR 0x02 25#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */ 26#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ 27#define ISL1208_REG_DT 0x03 28#define ISL1208_REG_MO 0x04 29#define ISL1208_REG_YR 0x05 30#define ISL1208_REG_DW 0x06 31#define ISL1208_RTC_SECTION_LEN 7 32 33/* control/status section */ 34#define ISL1208_REG_SR 0x07 35#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */ 36#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */ 37#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */ 38#define ISL1208_REG_SR_ALM (1<<2) /* alarm */ 39#define ISL1208_REG_SR_BAT (1<<1) /* battery */ 40#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */ 41#define ISL1208_REG_INT 0x08 42#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */ 43#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */ 44#define ISL1208_REG_09 0x09 /* reserved */ 45#define ISL1208_REG_ATR 0x0a 46#define ISL1208_REG_DTR 0x0b 47 48/* alarm section */ 49#define ISL1208_REG_SCA 0x0c 50#define ISL1208_REG_MNA 0x0d 51#define ISL1208_REG_HRA 0x0e 52#define ISL1208_REG_DTA 0x0f 53#define ISL1208_REG_MOA 0x10 54#define ISL1208_REG_DWA 0x11 55#define ISL1208_ALARM_SECTION_LEN 6 56 57/* user section */ 58#define ISL1208_REG_USR1 0x12 59#define ISL1208_REG_USR2 0x13 60#define ISL1208_USR_SECTION_LEN 2 61 62static struct i2c_driver isl1208_driver; 63 64/* block read */ 65static int 66isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[], 67 unsigned len) 68{ 69 u8 reg_addr[1] = { reg }; 70 struct i2c_msg msgs[2] = { 71 { 72 .addr = client->addr, 73 .len = sizeof(reg_addr), 74 .buf = reg_addr 75 }, 76 { 77 .addr = client->addr, 78 .flags = I2C_M_RD, 79 .len = len, 80 .buf = buf 81 } 82 }; 83 int ret; 84 85 BUG_ON(reg > ISL1208_REG_USR2); 86 BUG_ON(reg + len > ISL1208_REG_USR2 + 1); 87 88 ret = i2c_transfer(client->adapter, msgs, 2); 89 if (ret > 0) 90 ret = 0; 91 return ret; 92} 93 94/* block write */ 95static int 96isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], 97 unsigned len) 98{ 99 u8 i2c_buf[ISL1208_REG_USR2 + 2]; 100 struct i2c_msg msgs[1] = { 101 { 102 .addr = client->addr, 103 .len = len + 1, 104 .buf = i2c_buf 105 } 106 }; 107 int ret; 108 109 BUG_ON(reg > ISL1208_REG_USR2); 110 BUG_ON(reg + len > ISL1208_REG_USR2 + 1); 111 112 i2c_buf[0] = reg; 113 memcpy(&i2c_buf[1], &buf[0], len); 114 115 ret = i2c_transfer(client->adapter, msgs, 1); 116 if (ret > 0) 117 ret = 0; 118 return ret; 119} 120 121/* simple check to see whether we have a isl1208 */ 122static int 123isl1208_i2c_validate_client(struct i2c_client *client) 124{ 125 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 126 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { 127 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 128 }; 129 int i; 130 int ret; 131 132 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 133 if (ret < 0) 134 return ret; 135 136 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { 137 if (regs[i] & zero_mask[i]) /* check if bits are cleared */ 138 return -ENODEV; 139 } 140 141 return 0; 142} 143 144static int 145isl1208_i2c_get_sr(struct i2c_client *client) 146{ 147 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); 148} 149 150static int 151isl1208_i2c_get_atr(struct i2c_client *client) 152{ 153 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); 154 if (atr < 0) 155 return atr; 156 157 /* The 6bit value in the ATR register controls the load 158 * capacitance C_load * in steps of 0.25pF 159 * 160 * bit (1<<5) of the ATR register is inverted 161 * 162 * C_load(ATR=0x20) = 4.50pF 163 * C_load(ATR=0x00) = 12.50pF 164 * C_load(ATR=0x1f) = 20.25pF 165 * 166 */ 167 168 atr &= 0x3f; /* mask out lsb */ 169 atr ^= 1 << 5; /* invert 6th bit */ 170 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ 171 172 return atr; 173} 174 175static int 176isl1208_i2c_get_dtr(struct i2c_client *client) 177{ 178 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); 179 if (dtr < 0) 180 return -EIO; 181 182 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ 183 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); 184 185 return dtr; 186} 187 188static int 189isl1208_i2c_get_usr(struct i2c_client *client) 190{ 191 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; 192 int ret; 193 194 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, 195 ISL1208_USR_SECTION_LEN); 196 if (ret < 0) 197 return ret; 198 199 return (buf[1] << 8) | buf[0]; 200} 201 202static int 203isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) 204{ 205 u8 buf[ISL1208_USR_SECTION_LEN]; 206 207 buf[0] = usr & 0xff; 208 buf[1] = (usr >> 8) & 0xff; 209 210 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, 211 ISL1208_USR_SECTION_LEN); 212} 213 214static int 215isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) 216{ 217 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 218 219 if (icr < 0) { 220 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 221 return icr; 222 } 223 224 if (enable) 225 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; 226 else 227 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); 228 229 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); 230 if (icr < 0) { 231 dev_err(&client->dev, "%s: writing INT failed\n", __func__); 232 return icr; 233 } 234 235 return 0; 236} 237 238static int 239isl1208_rtc_proc(struct device *dev, struct seq_file *seq) 240{ 241 struct i2c_client *const client = to_i2c_client(dev); 242 int sr, dtr, atr, usr; 243 244 sr = isl1208_i2c_get_sr(client); 245 if (sr < 0) { 246 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 247 return sr; 248 } 249 250 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", 251 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", 252 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", 253 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", 254 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", 255 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", 256 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); 257 258 seq_printf(seq, "batt_status\t: %s\n", 259 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); 260 261 dtr = isl1208_i2c_get_dtr(client); 262 if (dtr >= 0 - 1) 263 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr); 264 265 atr = isl1208_i2c_get_atr(client); 266 if (atr >= 0) 267 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", 268 atr >> 2, (atr & 0x3) * 25); 269 270 usr = isl1208_i2c_get_usr(client); 271 if (usr >= 0) 272 seq_printf(seq, "user_data\t: 0x%.4x\n", usr); 273 274 return 0; 275} 276 277static int 278isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) 279{ 280 int sr; 281 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 282 283 sr = isl1208_i2c_get_sr(client); 284 if (sr < 0) { 285 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 286 return -EIO; 287 } 288 289 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 290 if (sr < 0) { 291 dev_err(&client->dev, "%s: reading RTC section failed\n", 292 __func__); 293 return sr; 294 } 295 296 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); 297 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); 298 299 /* HR field has a more complex interpretation */ 300 { 301 const u8 _hr = regs[ISL1208_REG_HR]; 302 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ 303 tm->tm_hour = bcd2bin(_hr & 0x3f); 304 else { 305 /* 12h format */ 306 tm->tm_hour = bcd2bin(_hr & 0x1f); 307 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ 308 tm->tm_hour += 12; 309 } 310 } 311 312 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); 313 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ 314 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; 315 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); 316 317 return 0; 318} 319 320static int 321isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 322{ 323 struct rtc_time *const tm = &alarm->time; 324 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 325 int icr, yr, sr = isl1208_i2c_get_sr(client); 326 327 if (sr < 0) { 328 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 329 return sr; 330 } 331 332 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, 333 ISL1208_ALARM_SECTION_LEN); 334 if (sr < 0) { 335 dev_err(&client->dev, "%s: reading alarm section failed\n", 336 __func__); 337 return sr; 338 } 339 340 /* MSB of each alarm register is an enable bit */ 341 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); 342 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); 343 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); 344 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); 345 tm->tm_mon = 346 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; 347 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); 348 349 /* The alarm doesn't store the year so get it from the rtc section */ 350 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); 351 if (yr < 0) { 352 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); 353 return yr; 354 } 355 tm->tm_year = bcd2bin(yr) + 100; 356 357 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 358 if (icr < 0) { 359 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 360 return icr; 361 } 362 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); 363 364 return 0; 365} 366 367static int 368isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 369{ 370 struct rtc_time *alarm_tm = &alarm->time; 371 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 372 const int offs = ISL1208_REG_SCA; 373 unsigned long rtc_secs, alarm_secs; 374 struct rtc_time rtc_tm; 375 int err, enable; 376 377 err = isl1208_i2c_read_time(client, &rtc_tm); 378 if (err) 379 return err; 380 err = rtc_tm_to_time(&rtc_tm, &rtc_secs); 381 if (err) 382 return err; 383 err = rtc_tm_to_time(alarm_tm, &alarm_secs); 384 if (err) 385 return err; 386 387 /* If the alarm time is before the current time disable the alarm */ 388 if (!alarm->enabled || alarm_secs <= rtc_secs) 389 enable = 0x00; 390 else 391 enable = 0x80; 392 393 /* Program the alarm and enable it for each setting */ 394 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; 395 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; 396 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | 397 ISL1208_REG_HR_MIL | enable; 398 399 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; 400 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; 401 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; 402 403 /* write ALARM registers */ 404 err = isl1208_i2c_set_regs(client, offs, regs, 405 ISL1208_ALARM_SECTION_LEN); 406 if (err < 0) { 407 dev_err(&client->dev, "%s: writing ALARM section failed\n", 408 __func__); 409 return err; 410 } 411 412 err = isl1208_rtc_toggle_alarm(client, enable); 413 if (err) 414 return err; 415 416 return 0; 417} 418 419static int 420isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) 421{ 422 return isl1208_i2c_read_time(to_i2c_client(dev), tm); 423} 424 425static int 426isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) 427{ 428 int sr; 429 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 430 431 /* The clock has an 8 bit wide bcd-coded register (they never learn) 432 * for the year. tm_year is an offset from 1900 and we are interested 433 * in the 2000-2099 range, so any value less than 100 is invalid. 434 */ 435 if (tm->tm_year < 100) 436 return -EINVAL; 437 438 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); 439 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); 440 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; 441 442 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); 443 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); 444 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); 445 446 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); 447 448 sr = isl1208_i2c_get_sr(client); 449 if (sr < 0) { 450 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 451 return sr; 452 } 453 454 /* set WRTC */ 455 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 456 sr | ISL1208_REG_SR_WRTC); 457 if (sr < 0) { 458 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 459 return sr; 460 } 461 462 /* write RTC registers */ 463 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 464 if (sr < 0) { 465 dev_err(&client->dev, "%s: writing RTC section failed\n", 466 __func__); 467 return sr; 468 } 469 470 /* clear WRTC again */ 471 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 472 sr & ~ISL1208_REG_SR_WRTC); 473 if (sr < 0) { 474 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 475 return sr; 476 } 477 478 return 0; 479} 480 481 482static int 483isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) 484{ 485 return isl1208_i2c_set_time(to_i2c_client(dev), tm); 486} 487 488static int 489isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 490{ 491 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); 492} 493 494static int 495isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 496{ 497 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); 498} 499 500static irqreturn_t 501isl1208_rtc_interrupt(int irq, void *data) 502{ 503 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 504 struct i2c_client *client = data; 505 struct rtc_device *rtc = i2c_get_clientdata(client); 506 int handled = 0, sr, err; 507 508 /* 509 * I2C reads get NAK'ed if we read straight away after an interrupt? 510 * Using a mdelay/msleep didn't seem to help either, so we work around 511 * this by continually trying to read the register for a short time. 512 */ 513 while (1) { 514 sr = isl1208_i2c_get_sr(client); 515 if (sr >= 0) 516 break; 517 518 if (time_after(jiffies, timeout)) { 519 dev_err(&client->dev, "%s: reading SR failed\n", 520 __func__); 521 return sr; 522 } 523 } 524 525 if (sr & ISL1208_REG_SR_ALM) { 526 dev_dbg(&client->dev, "alarm!\n"); 527 528 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); 529 530 /* Clear the alarm */ 531 sr &= ~ISL1208_REG_SR_ALM; 532 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 533 if (sr < 0) 534 dev_err(&client->dev, "%s: writing SR failed\n", 535 __func__); 536 else 537 handled = 1; 538 539 /* Disable the alarm */ 540 err = isl1208_rtc_toggle_alarm(client, 0); 541 if (err) 542 return err; 543 } 544 545 return handled ? IRQ_HANDLED : IRQ_NONE; 546} 547 548static const struct rtc_class_ops isl1208_rtc_ops = { 549 .proc = isl1208_rtc_proc, 550 .read_time = isl1208_rtc_read_time, 551 .set_time = isl1208_rtc_set_time, 552 .read_alarm = isl1208_rtc_read_alarm, 553 .set_alarm = isl1208_rtc_set_alarm, 554}; 555 556/* sysfs interface */ 557 558static ssize_t 559isl1208_sysfs_show_atrim(struct device *dev, 560 struct device_attribute *attr, char *buf) 561{ 562 int atr = isl1208_i2c_get_atr(to_i2c_client(dev)); 563 if (atr < 0) 564 return atr; 565 566 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); 567} 568 569static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); 570 571static ssize_t 572isl1208_sysfs_show_dtrim(struct device *dev, 573 struct device_attribute *attr, char *buf) 574{ 575 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev)); 576 if (dtr < 0) 577 return dtr; 578 579 return sprintf(buf, "%d ppm\n", dtr); 580} 581 582static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); 583 584static ssize_t 585isl1208_sysfs_show_usr(struct device *dev, 586 struct device_attribute *attr, char *buf) 587{ 588 int usr = isl1208_i2c_get_usr(to_i2c_client(dev)); 589 if (usr < 0) 590 return usr; 591 592 return sprintf(buf, "0x%.4x\n", usr); 593} 594 595static ssize_t 596isl1208_sysfs_store_usr(struct device *dev, 597 struct device_attribute *attr, 598 const char *buf, size_t count) 599{ 600 int usr = -1; 601 602 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { 603 if (sscanf(buf, "%x", &usr) != 1) 604 return -EINVAL; 605 } else { 606 if (sscanf(buf, "%d", &usr) != 1) 607 return -EINVAL; 608 } 609 610 if (usr < 0 || usr > 0xffff) 611 return -EINVAL; 612 613 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count; 614} 615 616static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, 617 isl1208_sysfs_store_usr); 618 619static struct attribute *isl1208_rtc_attrs[] = { 620 &dev_attr_atrim.attr, 621 &dev_attr_dtrim.attr, 622 &dev_attr_usr.attr, 623 NULL 624}; 625 626static const struct attribute_group isl1208_rtc_sysfs_files = { 627 .attrs = isl1208_rtc_attrs, 628}; 629 630static int 631isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) 632{ 633 int rc = 0; 634 struct rtc_device *rtc; 635 636 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 637 return -ENODEV; 638 639 if (isl1208_i2c_validate_client(client) < 0) 640 return -ENODEV; 641 642 dev_info(&client->dev, 643 "chip found, driver version " DRV_VERSION "\n"); 644 645 if (client->irq > 0) { 646 rc = devm_request_threaded_irq(&client->dev, client->irq, NULL, 647 isl1208_rtc_interrupt, 648 IRQF_SHARED, 649 isl1208_driver.driver.name, 650 client); 651 if (!rc) { 652 device_init_wakeup(&client->dev, 1); 653 enable_irq_wake(client->irq); 654 } else { 655 dev_err(&client->dev, 656 "Unable to request irq %d, no alarm support\n", 657 client->irq); 658 client->irq = 0; 659 } 660 } 661 662 rtc = devm_rtc_device_register(&client->dev, isl1208_driver.driver.name, 663 &isl1208_rtc_ops, 664 THIS_MODULE); 665 if (IS_ERR(rtc)) 666 return PTR_ERR(rtc); 667 668 i2c_set_clientdata(client, rtc); 669 670 rc = isl1208_i2c_get_sr(client); 671 if (rc < 0) { 672 dev_err(&client->dev, "reading status failed\n"); 673 return rc; 674 } 675 676 if (rc & ISL1208_REG_SR_RTCF) 677 dev_warn(&client->dev, "rtc power failure detected, " 678 "please set clock.\n"); 679 680 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 681 if (rc) 682 return rc; 683 684 return 0; 685} 686 687static int 688isl1208_remove(struct i2c_client *client) 689{ 690 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 691 692 return 0; 693} 694 695static const struct i2c_device_id isl1208_id[] = { 696 { "isl1208", 0 }, 697 { "isl1218", 0 }, 698 { } 699}; 700MODULE_DEVICE_TABLE(i2c, isl1208_id); 701 702static struct i2c_driver isl1208_driver = { 703 .driver = { 704 .name = "rtc-isl1208", 705 }, 706 .probe = isl1208_probe, 707 .remove = isl1208_remove, 708 .id_table = isl1208_id, 709}; 710 711module_i2c_driver(isl1208_driver); 712 713MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>"); 714MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); 715MODULE_LICENSE("GPL"); 716MODULE_VERSION(DRV_VERSION); 717