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 int sr = i2c_smbus_read_byte_data(client, ISL1208_REG_SR); 148 if (sr < 0) 149 return -EIO; 150 151 return sr; 152 } 153 154 static int 155 isl1208_i2c_get_atr(struct i2c_client *client) 156 { 157 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); 158 if (atr < 0) 159 return atr; 160 161 /* The 6bit value in the ATR register controls the load 162 * capacitance C_load * in steps of 0.25pF 163 * 164 * bit (1<<5) of the ATR register is inverted 165 * 166 * C_load(ATR=0x20) = 4.50pF 167 * C_load(ATR=0x00) = 12.50pF 168 * C_load(ATR=0x1f) = 20.25pF 169 * 170 */ 171 172 atr &= 0x3f; /* mask out lsb */ 173 atr ^= 1 << 5; /* invert 6th bit */ 174 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ 175 176 return atr; 177 } 178 179 static int 180 isl1208_i2c_get_dtr(struct i2c_client *client) 181 { 182 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); 183 if (dtr < 0) 184 return -EIO; 185 186 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ 187 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); 188 189 return dtr; 190 } 191 192 static int 193 isl1208_i2c_get_usr(struct i2c_client *client) 194 { 195 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; 196 int ret; 197 198 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, 199 ISL1208_USR_SECTION_LEN); 200 if (ret < 0) 201 return ret; 202 203 return (buf[1] << 8) | buf[0]; 204 } 205 206 static int 207 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) 208 { 209 u8 buf[ISL1208_USR_SECTION_LEN]; 210 211 buf[0] = usr & 0xff; 212 buf[1] = (usr >> 8) & 0xff; 213 214 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, 215 ISL1208_USR_SECTION_LEN); 216 } 217 218 static int 219 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) 220 { 221 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 222 223 if (icr < 0) { 224 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 225 return icr; 226 } 227 228 if (enable) 229 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; 230 else 231 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); 232 233 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); 234 if (icr < 0) { 235 dev_err(&client->dev, "%s: writing INT failed\n", __func__); 236 return icr; 237 } 238 239 return 0; 240 } 241 242 static int 243 isl1208_rtc_proc(struct device *dev, struct seq_file *seq) 244 { 245 struct i2c_client *const client = to_i2c_client(dev); 246 int sr, dtr, atr, usr; 247 248 sr = isl1208_i2c_get_sr(client); 249 if (sr < 0) { 250 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 251 return sr; 252 } 253 254 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", 255 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", 256 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", 257 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", 258 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", 259 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", 260 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); 261 262 seq_printf(seq, "batt_status\t: %s\n", 263 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); 264 265 dtr = isl1208_i2c_get_dtr(client); 266 if (dtr >= 0 - 1) 267 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr); 268 269 atr = isl1208_i2c_get_atr(client); 270 if (atr >= 0) 271 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", 272 atr >> 2, (atr & 0x3) * 25); 273 274 usr = isl1208_i2c_get_usr(client); 275 if (usr >= 0) 276 seq_printf(seq, "user_data\t: 0x%.4x\n", usr); 277 278 return 0; 279 } 280 281 static int 282 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) 283 { 284 int sr; 285 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 286 287 sr = isl1208_i2c_get_sr(client); 288 if (sr < 0) { 289 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 290 return -EIO; 291 } 292 293 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 294 if (sr < 0) { 295 dev_err(&client->dev, "%s: reading RTC section failed\n", 296 __func__); 297 return sr; 298 } 299 300 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); 301 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); 302 303 /* HR field has a more complex interpretation */ 304 { 305 const u8 _hr = regs[ISL1208_REG_HR]; 306 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ 307 tm->tm_hour = bcd2bin(_hr & 0x3f); 308 else { 309 /* 12h format */ 310 tm->tm_hour = bcd2bin(_hr & 0x1f); 311 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ 312 tm->tm_hour += 12; 313 } 314 } 315 316 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); 317 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ 318 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; 319 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); 320 321 return 0; 322 } 323 324 static int 325 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 326 { 327 struct rtc_time *const tm = &alarm->time; 328 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 329 int icr, yr, sr = isl1208_i2c_get_sr(client); 330 331 if (sr < 0) { 332 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 333 return sr; 334 } 335 336 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, 337 ISL1208_ALARM_SECTION_LEN); 338 if (sr < 0) { 339 dev_err(&client->dev, "%s: reading alarm section failed\n", 340 __func__); 341 return sr; 342 } 343 344 /* MSB of each alarm register is an enable bit */ 345 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); 346 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); 347 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); 348 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); 349 tm->tm_mon = 350 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; 351 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); 352 353 /* The alarm doesn't store the year so get it from the rtc section */ 354 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); 355 if (yr < 0) { 356 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); 357 return yr; 358 } 359 tm->tm_year = bcd2bin(yr) + 100; 360 361 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 362 if (icr < 0) { 363 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 364 return icr; 365 } 366 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); 367 368 return 0; 369 } 370 371 static int 372 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 373 { 374 struct rtc_time *alarm_tm = &alarm->time; 375 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 376 const int offs = ISL1208_REG_SCA; 377 unsigned long rtc_secs, alarm_secs; 378 struct rtc_time rtc_tm; 379 int err, enable; 380 381 err = isl1208_i2c_read_time(client, &rtc_tm); 382 if (err) 383 return err; 384 err = rtc_tm_to_time(&rtc_tm, &rtc_secs); 385 if (err) 386 return err; 387 err = rtc_tm_to_time(alarm_tm, &alarm_secs); 388 if (err) 389 return err; 390 391 /* If the alarm time is before the current time disable the alarm */ 392 if (!alarm->enabled || alarm_secs <= rtc_secs) 393 enable = 0x00; 394 else 395 enable = 0x80; 396 397 /* Program the alarm and enable it for each setting */ 398 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; 399 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; 400 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | 401 ISL1208_REG_HR_MIL | enable; 402 403 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; 404 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; 405 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; 406 407 /* write ALARM registers */ 408 err = isl1208_i2c_set_regs(client, offs, regs, 409 ISL1208_ALARM_SECTION_LEN); 410 if (err < 0) { 411 dev_err(&client->dev, "%s: writing ALARM section failed\n", 412 __func__); 413 return err; 414 } 415 416 err = isl1208_rtc_toggle_alarm(client, enable); 417 if (err) 418 return err; 419 420 return 0; 421 } 422 423 static int 424 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) 425 { 426 return isl1208_i2c_read_time(to_i2c_client(dev), tm); 427 } 428 429 static int 430 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) 431 { 432 int sr; 433 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 434 435 /* The clock has an 8 bit wide bcd-coded register (they never learn) 436 * for the year. tm_year is an offset from 1900 and we are interested 437 * in the 2000-2099 range, so any value less than 100 is invalid. 438 */ 439 if (tm->tm_year < 100) 440 return -EINVAL; 441 442 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); 443 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); 444 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; 445 446 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); 447 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); 448 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); 449 450 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); 451 452 sr = isl1208_i2c_get_sr(client); 453 if (sr < 0) { 454 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 455 return sr; 456 } 457 458 /* set WRTC */ 459 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 460 sr | ISL1208_REG_SR_WRTC); 461 if (sr < 0) { 462 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 463 return sr; 464 } 465 466 /* write RTC registers */ 467 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 468 if (sr < 0) { 469 dev_err(&client->dev, "%s: writing RTC section failed\n", 470 __func__); 471 return sr; 472 } 473 474 /* clear WRTC again */ 475 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 476 sr & ~ISL1208_REG_SR_WRTC); 477 if (sr < 0) { 478 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 479 return sr; 480 } 481 482 return 0; 483 } 484 485 486 static int 487 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) 488 { 489 return isl1208_i2c_set_time(to_i2c_client(dev), tm); 490 } 491 492 static int 493 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 494 { 495 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); 496 } 497 498 static int 499 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 500 { 501 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); 502 } 503 504 static irqreturn_t 505 isl1208_rtc_interrupt(int irq, void *data) 506 { 507 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 508 struct i2c_client *client = data; 509 struct rtc_device *rtc = i2c_get_clientdata(client); 510 int handled = 0, sr, err; 511 512 /* 513 * I2C reads get NAK'ed if we read straight away after an interrupt? 514 * Using a mdelay/msleep didn't seem to help either, so we work around 515 * this by continually trying to read the register for a short time. 516 */ 517 while (1) { 518 sr = isl1208_i2c_get_sr(client); 519 if (sr >= 0) 520 break; 521 522 if (time_after(jiffies, timeout)) { 523 dev_err(&client->dev, "%s: reading SR failed\n", 524 __func__); 525 return sr; 526 } 527 } 528 529 if (sr & ISL1208_REG_SR_ALM) { 530 dev_dbg(&client->dev, "alarm!\n"); 531 532 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); 533 534 /* Clear the alarm */ 535 sr &= ~ISL1208_REG_SR_ALM; 536 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 537 if (sr < 0) 538 dev_err(&client->dev, "%s: writing SR failed\n", 539 __func__); 540 else 541 handled = 1; 542 543 /* Disable the alarm */ 544 err = isl1208_rtc_toggle_alarm(client, 0); 545 if (err) 546 return err; 547 } 548 549 return handled ? IRQ_HANDLED : IRQ_NONE; 550 } 551 552 static const struct rtc_class_ops isl1208_rtc_ops = { 553 .proc = isl1208_rtc_proc, 554 .read_time = isl1208_rtc_read_time, 555 .set_time = isl1208_rtc_set_time, 556 .read_alarm = isl1208_rtc_read_alarm, 557 .set_alarm = isl1208_rtc_set_alarm, 558 }; 559 560 /* sysfs interface */ 561 562 static ssize_t 563 isl1208_sysfs_show_atrim(struct device *dev, 564 struct device_attribute *attr, char *buf) 565 { 566 int atr = isl1208_i2c_get_atr(to_i2c_client(dev)); 567 if (atr < 0) 568 return atr; 569 570 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); 571 } 572 573 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); 574 575 static ssize_t 576 isl1208_sysfs_show_dtrim(struct device *dev, 577 struct device_attribute *attr, char *buf) 578 { 579 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev)); 580 if (dtr < 0) 581 return dtr; 582 583 return sprintf(buf, "%d ppm\n", dtr); 584 } 585 586 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); 587 588 static ssize_t 589 isl1208_sysfs_show_usr(struct device *dev, 590 struct device_attribute *attr, char *buf) 591 { 592 int usr = isl1208_i2c_get_usr(to_i2c_client(dev)); 593 if (usr < 0) 594 return usr; 595 596 return sprintf(buf, "0x%.4x\n", usr); 597 } 598 599 static ssize_t 600 isl1208_sysfs_store_usr(struct device *dev, 601 struct device_attribute *attr, 602 const char *buf, size_t count) 603 { 604 int usr = -1; 605 606 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { 607 if (sscanf(buf, "%x", &usr) != 1) 608 return -EINVAL; 609 } else { 610 if (sscanf(buf, "%d", &usr) != 1) 611 return -EINVAL; 612 } 613 614 if (usr < 0 || usr > 0xffff) 615 return -EINVAL; 616 617 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count; 618 } 619 620 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, 621 isl1208_sysfs_store_usr); 622 623 static struct attribute *isl1208_rtc_attrs[] = { 624 &dev_attr_atrim.attr, 625 &dev_attr_dtrim.attr, 626 &dev_attr_usr.attr, 627 NULL 628 }; 629 630 static const struct attribute_group isl1208_rtc_sysfs_files = { 631 .attrs = isl1208_rtc_attrs, 632 }; 633 634 static int 635 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) 636 { 637 int rc = 0; 638 struct rtc_device *rtc; 639 640 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 641 return -ENODEV; 642 643 if (isl1208_i2c_validate_client(client) < 0) 644 return -ENODEV; 645 646 dev_info(&client->dev, 647 "chip found, driver version " DRV_VERSION "\n"); 648 649 if (client->irq > 0) { 650 rc = request_threaded_irq(client->irq, NULL, 651 isl1208_rtc_interrupt, 652 IRQF_SHARED, 653 isl1208_driver.driver.name, client); 654 if (!rc) { 655 device_init_wakeup(&client->dev, 1); 656 enable_irq_wake(client->irq); 657 } else { 658 dev_err(&client->dev, 659 "Unable to request irq %d, no alarm support\n", 660 client->irq); 661 client->irq = 0; 662 } 663 } 664 665 rtc = rtc_device_register(isl1208_driver.driver.name, 666 &client->dev, &isl1208_rtc_ops, 667 THIS_MODULE); 668 if (IS_ERR(rtc)) { 669 rc = PTR_ERR(rtc); 670 goto exit_free_irq; 671 } 672 673 i2c_set_clientdata(client, rtc); 674 675 rc = isl1208_i2c_get_sr(client); 676 if (rc < 0) { 677 dev_err(&client->dev, "reading status failed\n"); 678 goto exit_unregister; 679 } 680 681 if (rc & ISL1208_REG_SR_RTCF) 682 dev_warn(&client->dev, "rtc power failure detected, " 683 "please set clock.\n"); 684 685 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 686 if (rc) 687 goto exit_unregister; 688 689 return 0; 690 691 exit_unregister: 692 rtc_device_unregister(rtc); 693 exit_free_irq: 694 if (client->irq) 695 free_irq(client->irq, client); 696 697 return rc; 698 } 699 700 static int 701 isl1208_remove(struct i2c_client *client) 702 { 703 struct rtc_device *rtc = i2c_get_clientdata(client); 704 705 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 706 rtc_device_unregister(rtc); 707 if (client->irq) 708 free_irq(client->irq, client); 709 710 return 0; 711 } 712 713 static const struct i2c_device_id isl1208_id[] = { 714 { "isl1208", 0 }, 715 { "isl1218", 0 }, 716 { } 717 }; 718 MODULE_DEVICE_TABLE(i2c, isl1208_id); 719 720 static struct i2c_driver isl1208_driver = { 721 .driver = { 722 .name = "rtc-isl1208", 723 }, 724 .probe = isl1208_probe, 725 .remove = isl1208_remove, 726 .id_table = isl1208_id, 727 }; 728 729 module_i2c_driver(isl1208_driver); 730 731 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>"); 732 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); 733 MODULE_LICENSE("GPL"); 734 MODULE_VERSION(DRV_VERSION); 735