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