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 62 static struct i2c_driver isl1208_driver; 63 64 /* block read */ 65 static int 66 isl1208_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 */ 95 static int 96 isl1208_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 */ 122 static int 123 isl1208_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 } 143 144 static int 145 isl1208_i2c_get_sr(struct i2c_client *client) 146 { 147 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); 148 } 149 150 static int 151 isl1208_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 } 174 175 static int 176 isl1208_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 } 187 188 static int 189 isl1208_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 } 201 202 static int 203 isl1208_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 } 213 214 static int 215 isl1208_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 } 237 238 static int 239 isl1208_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 } 276 277 static int 278 isl1208_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 } 319 320 static int 321 isl1208_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 } 366 367 static int 368 isl1208_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 struct rtc_time rtc_tm; 374 int err, enable; 375 376 err = isl1208_i2c_read_time(client, &rtc_tm); 377 if (err) 378 return err; 379 380 /* If the alarm time is before the current time disable the alarm */ 381 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0) 382 enable = 0x00; 383 else 384 enable = 0x80; 385 386 /* Program the alarm and enable it for each setting */ 387 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; 388 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; 389 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | 390 ISL1208_REG_HR_MIL | enable; 391 392 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; 393 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; 394 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; 395 396 /* write ALARM registers */ 397 err = isl1208_i2c_set_regs(client, offs, regs, 398 ISL1208_ALARM_SECTION_LEN); 399 if (err < 0) { 400 dev_err(&client->dev, "%s: writing ALARM section failed\n", 401 __func__); 402 return err; 403 } 404 405 err = isl1208_rtc_toggle_alarm(client, enable); 406 if (err) 407 return err; 408 409 return 0; 410 } 411 412 static int 413 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) 414 { 415 return isl1208_i2c_read_time(to_i2c_client(dev), tm); 416 } 417 418 static int 419 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) 420 { 421 int sr; 422 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 423 424 /* The clock has an 8 bit wide bcd-coded register (they never learn) 425 * for the year. tm_year is an offset from 1900 and we are interested 426 * in the 2000-2099 range, so any value less than 100 is invalid. 427 */ 428 if (tm->tm_year < 100) 429 return -EINVAL; 430 431 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); 432 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); 433 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; 434 435 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); 436 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); 437 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); 438 439 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); 440 441 sr = isl1208_i2c_get_sr(client); 442 if (sr < 0) { 443 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 444 return sr; 445 } 446 447 /* set WRTC */ 448 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 449 sr | ISL1208_REG_SR_WRTC); 450 if (sr < 0) { 451 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 452 return sr; 453 } 454 455 /* write RTC registers */ 456 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 457 if (sr < 0) { 458 dev_err(&client->dev, "%s: writing RTC section failed\n", 459 __func__); 460 return sr; 461 } 462 463 /* clear WRTC again */ 464 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 465 sr & ~ISL1208_REG_SR_WRTC); 466 if (sr < 0) { 467 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 468 return sr; 469 } 470 471 return 0; 472 } 473 474 475 static int 476 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) 477 { 478 return isl1208_i2c_set_time(to_i2c_client(dev), tm); 479 } 480 481 static int 482 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 483 { 484 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); 485 } 486 487 static int 488 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 489 { 490 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); 491 } 492 493 static irqreturn_t 494 isl1208_rtc_interrupt(int irq, void *data) 495 { 496 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 497 struct i2c_client *client = data; 498 struct rtc_device *rtc = i2c_get_clientdata(client); 499 int handled = 0, sr, err; 500 501 /* 502 * I2C reads get NAK'ed if we read straight away after an interrupt? 503 * Using a mdelay/msleep didn't seem to help either, so we work around 504 * this by continually trying to read the register for a short time. 505 */ 506 while (1) { 507 sr = isl1208_i2c_get_sr(client); 508 if (sr >= 0) 509 break; 510 511 if (time_after(jiffies, timeout)) { 512 dev_err(&client->dev, "%s: reading SR failed\n", 513 __func__); 514 return sr; 515 } 516 } 517 518 if (sr & ISL1208_REG_SR_ALM) { 519 dev_dbg(&client->dev, "alarm!\n"); 520 521 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); 522 523 /* Clear the alarm */ 524 sr &= ~ISL1208_REG_SR_ALM; 525 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 526 if (sr < 0) 527 dev_err(&client->dev, "%s: writing SR failed\n", 528 __func__); 529 else 530 handled = 1; 531 532 /* Disable the alarm */ 533 err = isl1208_rtc_toggle_alarm(client, 0); 534 if (err) 535 return err; 536 } 537 538 return handled ? IRQ_HANDLED : IRQ_NONE; 539 } 540 541 static const struct rtc_class_ops isl1208_rtc_ops = { 542 .proc = isl1208_rtc_proc, 543 .read_time = isl1208_rtc_read_time, 544 .set_time = isl1208_rtc_set_time, 545 .read_alarm = isl1208_rtc_read_alarm, 546 .set_alarm = isl1208_rtc_set_alarm, 547 }; 548 549 /* sysfs interface */ 550 551 static ssize_t 552 isl1208_sysfs_show_atrim(struct device *dev, 553 struct device_attribute *attr, char *buf) 554 { 555 int atr = isl1208_i2c_get_atr(to_i2c_client(dev)); 556 if (atr < 0) 557 return atr; 558 559 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); 560 } 561 562 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); 563 564 static ssize_t 565 isl1208_sysfs_show_dtrim(struct device *dev, 566 struct device_attribute *attr, char *buf) 567 { 568 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev)); 569 if (dtr < 0) 570 return dtr; 571 572 return sprintf(buf, "%d ppm\n", dtr); 573 } 574 575 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); 576 577 static ssize_t 578 isl1208_sysfs_show_usr(struct device *dev, 579 struct device_attribute *attr, char *buf) 580 { 581 int usr = isl1208_i2c_get_usr(to_i2c_client(dev)); 582 if (usr < 0) 583 return usr; 584 585 return sprintf(buf, "0x%.4x\n", usr); 586 } 587 588 static ssize_t 589 isl1208_sysfs_store_usr(struct device *dev, 590 struct device_attribute *attr, 591 const char *buf, size_t count) 592 { 593 int usr = -1; 594 595 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { 596 if (sscanf(buf, "%x", &usr) != 1) 597 return -EINVAL; 598 } else { 599 if (sscanf(buf, "%d", &usr) != 1) 600 return -EINVAL; 601 } 602 603 if (usr < 0 || usr > 0xffff) 604 return -EINVAL; 605 606 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count; 607 } 608 609 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, 610 isl1208_sysfs_store_usr); 611 612 static struct attribute *isl1208_rtc_attrs[] = { 613 &dev_attr_atrim.attr, 614 &dev_attr_dtrim.attr, 615 &dev_attr_usr.attr, 616 NULL 617 }; 618 619 static const struct attribute_group isl1208_rtc_sysfs_files = { 620 .attrs = isl1208_rtc_attrs, 621 }; 622 623 static int 624 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) 625 { 626 int rc = 0; 627 struct rtc_device *rtc; 628 629 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 630 return -ENODEV; 631 632 if (isl1208_i2c_validate_client(client) < 0) 633 return -ENODEV; 634 635 dev_info(&client->dev, 636 "chip found, driver version " DRV_VERSION "\n"); 637 638 if (client->irq > 0) { 639 rc = devm_request_threaded_irq(&client->dev, client->irq, NULL, 640 isl1208_rtc_interrupt, 641 IRQF_SHARED | IRQF_ONESHOT, 642 isl1208_driver.driver.name, 643 client); 644 if (!rc) { 645 device_init_wakeup(&client->dev, 1); 646 enable_irq_wake(client->irq); 647 } else { 648 dev_err(&client->dev, 649 "Unable to request irq %d, no alarm support\n", 650 client->irq); 651 client->irq = 0; 652 } 653 } 654 655 rtc = devm_rtc_device_register(&client->dev, isl1208_driver.driver.name, 656 &isl1208_rtc_ops, 657 THIS_MODULE); 658 if (IS_ERR(rtc)) 659 return PTR_ERR(rtc); 660 661 i2c_set_clientdata(client, rtc); 662 663 rc = isl1208_i2c_get_sr(client); 664 if (rc < 0) { 665 dev_err(&client->dev, "reading status failed\n"); 666 return rc; 667 } 668 669 if (rc & ISL1208_REG_SR_RTCF) 670 dev_warn(&client->dev, "rtc power failure detected, " 671 "please set clock.\n"); 672 673 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 674 if (rc) 675 return rc; 676 677 return 0; 678 } 679 680 static int 681 isl1208_remove(struct i2c_client *client) 682 { 683 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 684 685 return 0; 686 } 687 688 static const struct i2c_device_id isl1208_id[] = { 689 { "isl1208", 0 }, 690 { "isl1218", 0 }, 691 { } 692 }; 693 MODULE_DEVICE_TABLE(i2c, isl1208_id); 694 695 static struct i2c_driver isl1208_driver = { 696 .driver = { 697 .name = "rtc-isl1208", 698 }, 699 .probe = isl1208_probe, 700 .remove = isl1208_remove, 701 .id_table = isl1208_id, 702 }; 703 704 module_i2c_driver(isl1208_driver); 705 706 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>"); 707 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); 708 MODULE_LICENSE("GPL"); 709 MODULE_VERSION(DRV_VERSION); 710