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 {client->addr, 0, sizeof(reg_addr), reg_addr} 72 , 73 {client->addr, I2C_M_RD, len, buf} 74 }; 75 int ret; 76 77 BUG_ON(reg > ISL1208_REG_USR2); 78 BUG_ON(reg + len > ISL1208_REG_USR2 + 1); 79 80 ret = i2c_transfer(client->adapter, msgs, 2); 81 if (ret > 0) 82 ret = 0; 83 return ret; 84 } 85 86 /* block write */ 87 static int 88 isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], 89 unsigned len) 90 { 91 u8 i2c_buf[ISL1208_REG_USR2 + 2]; 92 struct i2c_msg msgs[1] = { 93 {client->addr, 0, len + 1, i2c_buf} 94 }; 95 int ret; 96 97 BUG_ON(reg > ISL1208_REG_USR2); 98 BUG_ON(reg + len > ISL1208_REG_USR2 + 1); 99 100 i2c_buf[0] = reg; 101 memcpy(&i2c_buf[1], &buf[0], len); 102 103 ret = i2c_transfer(client->adapter, msgs, 1); 104 if (ret > 0) 105 ret = 0; 106 return ret; 107 } 108 109 /* simple check to see wether we have a isl1208 */ 110 static int 111 isl1208_i2c_validate_client(struct i2c_client *client) 112 { 113 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 114 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { 115 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 116 }; 117 int i; 118 int ret; 119 120 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 121 if (ret < 0) 122 return ret; 123 124 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { 125 if (regs[i] & zero_mask[i]) /* check if bits are cleared */ 126 return -ENODEV; 127 } 128 129 return 0; 130 } 131 132 static int 133 isl1208_i2c_get_sr(struct i2c_client *client) 134 { 135 int sr = i2c_smbus_read_byte_data(client, ISL1208_REG_SR); 136 if (sr < 0) 137 return -EIO; 138 139 return sr; 140 } 141 142 static int 143 isl1208_i2c_get_atr(struct i2c_client *client) 144 { 145 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); 146 if (atr < 0) 147 return atr; 148 149 /* The 6bit value in the ATR register controls the load 150 * capacitance C_load * in steps of 0.25pF 151 * 152 * bit (1<<5) of the ATR register is inverted 153 * 154 * C_load(ATR=0x20) = 4.50pF 155 * C_load(ATR=0x00) = 12.50pF 156 * C_load(ATR=0x1f) = 20.25pF 157 * 158 */ 159 160 atr &= 0x3f; /* mask out lsb */ 161 atr ^= 1 << 5; /* invert 6th bit */ 162 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ 163 164 return atr; 165 } 166 167 static int 168 isl1208_i2c_get_dtr(struct i2c_client *client) 169 { 170 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); 171 if (dtr < 0) 172 return -EIO; 173 174 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ 175 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); 176 177 return dtr; 178 } 179 180 static int 181 isl1208_i2c_get_usr(struct i2c_client *client) 182 { 183 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; 184 int ret; 185 186 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, 187 ISL1208_USR_SECTION_LEN); 188 if (ret < 0) 189 return ret; 190 191 return (buf[1] << 8) | buf[0]; 192 } 193 194 static int 195 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) 196 { 197 u8 buf[ISL1208_USR_SECTION_LEN]; 198 199 buf[0] = usr & 0xff; 200 buf[1] = (usr >> 8) & 0xff; 201 202 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, 203 ISL1208_USR_SECTION_LEN); 204 } 205 206 static int 207 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) 208 { 209 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 210 211 if (icr < 0) { 212 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 213 return icr; 214 } 215 216 if (enable) 217 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; 218 else 219 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); 220 221 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); 222 if (icr < 0) { 223 dev_err(&client->dev, "%s: writing INT failed\n", __func__); 224 return icr; 225 } 226 227 return 0; 228 } 229 230 static int 231 isl1208_rtc_proc(struct device *dev, struct seq_file *seq) 232 { 233 struct i2c_client *const client = to_i2c_client(dev); 234 int sr, dtr, atr, usr; 235 236 sr = isl1208_i2c_get_sr(client); 237 if (sr < 0) { 238 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 239 return sr; 240 } 241 242 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", 243 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", 244 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", 245 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", 246 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", 247 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", 248 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); 249 250 seq_printf(seq, "batt_status\t: %s\n", 251 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); 252 253 dtr = isl1208_i2c_get_dtr(client); 254 if (dtr >= 0 - 1) 255 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr); 256 257 atr = isl1208_i2c_get_atr(client); 258 if (atr >= 0) 259 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", 260 atr >> 2, (atr & 0x3) * 25); 261 262 usr = isl1208_i2c_get_usr(client); 263 if (usr >= 0) 264 seq_printf(seq, "user_data\t: 0x%.4x\n", usr); 265 266 return 0; 267 } 268 269 static int 270 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) 271 { 272 int sr; 273 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 274 275 sr = isl1208_i2c_get_sr(client); 276 if (sr < 0) { 277 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 278 return -EIO; 279 } 280 281 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 282 if (sr < 0) { 283 dev_err(&client->dev, "%s: reading RTC section failed\n", 284 __func__); 285 return sr; 286 } 287 288 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); 289 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); 290 291 /* HR field has a more complex interpretation */ 292 { 293 const u8 _hr = regs[ISL1208_REG_HR]; 294 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ 295 tm->tm_hour = bcd2bin(_hr & 0x3f); 296 else { 297 /* 12h format */ 298 tm->tm_hour = bcd2bin(_hr & 0x1f); 299 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ 300 tm->tm_hour += 12; 301 } 302 } 303 304 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); 305 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ 306 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; 307 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); 308 309 return 0; 310 } 311 312 static int 313 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 314 { 315 struct rtc_time *const tm = &alarm->time; 316 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 317 int icr, yr, sr = isl1208_i2c_get_sr(client); 318 319 if (sr < 0) { 320 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 321 return sr; 322 } 323 324 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, 325 ISL1208_ALARM_SECTION_LEN); 326 if (sr < 0) { 327 dev_err(&client->dev, "%s: reading alarm section failed\n", 328 __func__); 329 return sr; 330 } 331 332 /* MSB of each alarm register is an enable bit */ 333 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); 334 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); 335 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); 336 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); 337 tm->tm_mon = 338 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; 339 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); 340 341 /* The alarm doesn't store the year so get it from the rtc section */ 342 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); 343 if (yr < 0) { 344 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); 345 return yr; 346 } 347 tm->tm_year = bcd2bin(yr) + 100; 348 349 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 350 if (icr < 0) { 351 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 352 return icr; 353 } 354 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); 355 356 return 0; 357 } 358 359 static int 360 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 361 { 362 struct rtc_time *alarm_tm = &alarm->time; 363 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 364 const int offs = ISL1208_REG_SCA; 365 unsigned long rtc_secs, alarm_secs; 366 struct rtc_time rtc_tm; 367 int err, enable; 368 369 err = isl1208_i2c_read_time(client, &rtc_tm); 370 if (err) 371 return err; 372 err = rtc_tm_to_time(&rtc_tm, &rtc_secs); 373 if (err) 374 return err; 375 err = rtc_tm_to_time(alarm_tm, &alarm_secs); 376 if (err) 377 return err; 378 379 /* If the alarm time is before the current time disable the alarm */ 380 if (!alarm->enabled || alarm_secs <= rtc_secs) 381 enable = 0x00; 382 else 383 enable = 0x80; 384 385 /* Program the alarm and enable it for each setting */ 386 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; 387 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; 388 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | 389 ISL1208_REG_HR_MIL | enable; 390 391 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; 392 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; 393 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; 394 395 /* write ALARM registers */ 396 err = isl1208_i2c_set_regs(client, offs, regs, 397 ISL1208_ALARM_SECTION_LEN); 398 if (err < 0) { 399 dev_err(&client->dev, "%s: writing ALARM section failed\n", 400 __func__); 401 return err; 402 } 403 404 err = isl1208_rtc_toggle_alarm(client, enable); 405 if (err) 406 return err; 407 408 return 0; 409 } 410 411 static int 412 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) 413 { 414 return isl1208_i2c_read_time(to_i2c_client(dev), tm); 415 } 416 417 static int 418 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) 419 { 420 int sr; 421 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 422 423 /* The clock has an 8 bit wide bcd-coded register (they never learn) 424 * for the year. tm_year is an offset from 1900 and we are interested 425 * in the 2000-2099 range, so any value less than 100 is invalid. 426 */ 427 if (tm->tm_year < 100) 428 return -EINVAL; 429 430 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); 431 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); 432 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; 433 434 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); 435 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); 436 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); 437 438 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); 439 440 sr = isl1208_i2c_get_sr(client); 441 if (sr < 0) { 442 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 443 return sr; 444 } 445 446 /* set WRTC */ 447 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 448 sr | ISL1208_REG_SR_WRTC); 449 if (sr < 0) { 450 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 451 return sr; 452 } 453 454 /* write RTC registers */ 455 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 456 if (sr < 0) { 457 dev_err(&client->dev, "%s: writing RTC section failed\n", 458 __func__); 459 return sr; 460 } 461 462 /* clear WRTC again */ 463 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 464 sr & ~ISL1208_REG_SR_WRTC); 465 if (sr < 0) { 466 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 467 return sr; 468 } 469 470 return 0; 471 } 472 473 474 static int 475 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) 476 { 477 return isl1208_i2c_set_time(to_i2c_client(dev), tm); 478 } 479 480 static int 481 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 482 { 483 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); 484 } 485 486 static int 487 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 488 { 489 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); 490 } 491 492 static irqreturn_t 493 isl1208_rtc_interrupt(int irq, void *data) 494 { 495 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 496 struct i2c_client *client = data; 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 /* Clear the alarm */ 520 sr &= ~ISL1208_REG_SR_ALM; 521 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 522 if (sr < 0) 523 dev_err(&client->dev, "%s: writing SR failed\n", 524 __func__); 525 else 526 handled = 1; 527 528 /* Disable the alarm */ 529 err = isl1208_rtc_toggle_alarm(client, 0); 530 if (err) 531 return err; 532 } 533 534 return handled ? IRQ_HANDLED : IRQ_NONE; 535 } 536 537 static const struct rtc_class_ops isl1208_rtc_ops = { 538 .proc = isl1208_rtc_proc, 539 .read_time = isl1208_rtc_read_time, 540 .set_time = isl1208_rtc_set_time, 541 .read_alarm = isl1208_rtc_read_alarm, 542 .set_alarm = isl1208_rtc_set_alarm, 543 }; 544 545 /* sysfs interface */ 546 547 static ssize_t 548 isl1208_sysfs_show_atrim(struct device *dev, 549 struct device_attribute *attr, char *buf) 550 { 551 int atr = isl1208_i2c_get_atr(to_i2c_client(dev)); 552 if (atr < 0) 553 return atr; 554 555 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); 556 } 557 558 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); 559 560 static ssize_t 561 isl1208_sysfs_show_dtrim(struct device *dev, 562 struct device_attribute *attr, char *buf) 563 { 564 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev)); 565 if (dtr < 0) 566 return dtr; 567 568 return sprintf(buf, "%d ppm\n", dtr); 569 } 570 571 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); 572 573 static ssize_t 574 isl1208_sysfs_show_usr(struct device *dev, 575 struct device_attribute *attr, char *buf) 576 { 577 int usr = isl1208_i2c_get_usr(to_i2c_client(dev)); 578 if (usr < 0) 579 return usr; 580 581 return sprintf(buf, "0x%.4x\n", usr); 582 } 583 584 static ssize_t 585 isl1208_sysfs_store_usr(struct device *dev, 586 struct device_attribute *attr, 587 const char *buf, size_t count) 588 { 589 int usr = -1; 590 591 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { 592 if (sscanf(buf, "%x", &usr) != 1) 593 return -EINVAL; 594 } else { 595 if (sscanf(buf, "%d", &usr) != 1) 596 return -EINVAL; 597 } 598 599 if (usr < 0 || usr > 0xffff) 600 return -EINVAL; 601 602 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count; 603 } 604 605 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, 606 isl1208_sysfs_store_usr); 607 608 static struct attribute *isl1208_rtc_attrs[] = { 609 &dev_attr_atrim.attr, 610 &dev_attr_dtrim.attr, 611 &dev_attr_usr.attr, 612 NULL 613 }; 614 615 static const struct attribute_group isl1208_rtc_sysfs_files = { 616 .attrs = isl1208_rtc_attrs, 617 }; 618 619 static int 620 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) 621 { 622 int rc = 0; 623 struct rtc_device *rtc; 624 625 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 626 return -ENODEV; 627 628 if (isl1208_i2c_validate_client(client) < 0) 629 return -ENODEV; 630 631 dev_info(&client->dev, 632 "chip found, driver version " DRV_VERSION "\n"); 633 634 if (client->irq > 0) { 635 rc = request_threaded_irq(client->irq, NULL, 636 isl1208_rtc_interrupt, 637 IRQF_SHARED, 638 isl1208_driver.driver.name, 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 = rtc_device_register(isl1208_driver.driver.name, 651 &client->dev, &isl1208_rtc_ops, 652 THIS_MODULE); 653 if (IS_ERR(rtc)) { 654 rc = PTR_ERR(rtc); 655 goto exit_free_irq; 656 } 657 658 i2c_set_clientdata(client, rtc); 659 660 rc = isl1208_i2c_get_sr(client); 661 if (rc < 0) { 662 dev_err(&client->dev, "reading status failed\n"); 663 goto exit_unregister; 664 } 665 666 if (rc & ISL1208_REG_SR_RTCF) 667 dev_warn(&client->dev, "rtc power failure detected, " 668 "please set clock.\n"); 669 670 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 671 if (rc) 672 goto exit_unregister; 673 674 return 0; 675 676 exit_unregister: 677 rtc_device_unregister(rtc); 678 exit_free_irq: 679 if (client->irq) 680 free_irq(client->irq, client); 681 682 return rc; 683 } 684 685 static int 686 isl1208_remove(struct i2c_client *client) 687 { 688 struct rtc_device *rtc = i2c_get_clientdata(client); 689 690 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files); 691 rtc_device_unregister(rtc); 692 if (client->irq) 693 free_irq(client->irq, client); 694 695 return 0; 696 } 697 698 static const struct i2c_device_id isl1208_id[] = { 699 { "isl1208", 0 }, 700 { } 701 }; 702 MODULE_DEVICE_TABLE(i2c, isl1208_id); 703 704 static struct i2c_driver isl1208_driver = { 705 .driver = { 706 .name = "rtc-isl1208", 707 }, 708 .probe = isl1208_probe, 709 .remove = isl1208_remove, 710 .id_table = isl1208_id, 711 }; 712 713 module_i2c_driver(isl1208_driver); 714 715 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>"); 716 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); 717 MODULE_LICENSE("GPL"); 718 MODULE_VERSION(DRV_VERSION); 719