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/bcd.h> 14 #include <linux/i2c.h> 15 #include <linux/module.h> 16 #include <linux/of_irq.h> 17 #include <linux/rtc.h> 18 19 /* Register map */ 20 /* rtc section */ 21 #define ISL1208_REG_SC 0x00 22 #define ISL1208_REG_MN 0x01 23 #define ISL1208_REG_HR 0x02 24 #define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */ 25 #define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ 26 #define ISL1208_REG_DT 0x03 27 #define ISL1208_REG_MO 0x04 28 #define ISL1208_REG_YR 0x05 29 #define ISL1208_REG_DW 0x06 30 #define ISL1208_RTC_SECTION_LEN 7 31 32 /* control/status section */ 33 #define ISL1208_REG_SR 0x07 34 #define ISL1208_REG_SR_ARST (1<<7) /* auto reset */ 35 #define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */ 36 #define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */ 37 #define ISL1208_REG_SR_EVT (1<<3) /* event */ 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 ISL1219_REG_EV 0x09 45 #define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */ 46 #define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */ 47 #define ISL1208_REG_ATR 0x0a 48 #define ISL1208_REG_DTR 0x0b 49 50 /* alarm section */ 51 #define ISL1208_REG_SCA 0x0c 52 #define ISL1208_REG_MNA 0x0d 53 #define ISL1208_REG_HRA 0x0e 54 #define ISL1208_REG_DTA 0x0f 55 #define ISL1208_REG_MOA 0x10 56 #define ISL1208_REG_DWA 0x11 57 #define ISL1208_ALARM_SECTION_LEN 6 58 59 /* user section */ 60 #define ISL1208_REG_USR1 0x12 61 #define ISL1208_REG_USR2 0x13 62 #define ISL1208_USR_SECTION_LEN 2 63 64 /* event section */ 65 #define ISL1219_REG_SCT 0x14 66 #define ISL1219_REG_MNT 0x15 67 #define ISL1219_REG_HRT 0x16 68 #define ISL1219_REG_DTT 0x17 69 #define ISL1219_REG_MOT 0x18 70 #define ISL1219_REG_YRT 0x19 71 #define ISL1219_EVT_SECTION_LEN 6 72 73 static struct i2c_driver isl1208_driver; 74 75 /* ISL1208 various variants */ 76 enum { 77 TYPE_ISL1208 = 0, 78 TYPE_ISL1218, 79 TYPE_ISL1219, 80 }; 81 82 /* block read */ 83 static int 84 isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[], 85 unsigned len) 86 { 87 u8 reg_addr[1] = { reg }; 88 struct i2c_msg msgs[2] = { 89 { 90 .addr = client->addr, 91 .len = sizeof(reg_addr), 92 .buf = reg_addr 93 }, 94 { 95 .addr = client->addr, 96 .flags = I2C_M_RD, 97 .len = len, 98 .buf = buf 99 } 100 }; 101 int ret; 102 103 WARN_ON(reg > ISL1219_REG_YRT); 104 WARN_ON(reg + len > ISL1219_REG_YRT + 1); 105 106 ret = i2c_transfer(client->adapter, msgs, 2); 107 if (ret > 0) 108 ret = 0; 109 return ret; 110 } 111 112 /* block write */ 113 static int 114 isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], 115 unsigned len) 116 { 117 u8 i2c_buf[ISL1208_REG_USR2 + 2]; 118 struct i2c_msg msgs[1] = { 119 { 120 .addr = client->addr, 121 .len = len + 1, 122 .buf = i2c_buf 123 } 124 }; 125 int ret; 126 127 WARN_ON(reg > ISL1219_REG_YRT); 128 WARN_ON(reg + len > ISL1219_REG_YRT + 1); 129 130 i2c_buf[0] = reg; 131 memcpy(&i2c_buf[1], &buf[0], len); 132 133 ret = i2c_transfer(client->adapter, msgs, 1); 134 if (ret > 0) 135 ret = 0; 136 return ret; 137 } 138 139 /* simple check to see whether we have a isl1208 */ 140 static int 141 isl1208_i2c_validate_client(struct i2c_client *client) 142 { 143 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 144 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { 145 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 146 }; 147 int i; 148 int ret; 149 150 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 151 if (ret < 0) 152 return ret; 153 154 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { 155 if (regs[i] & zero_mask[i]) /* check if bits are cleared */ 156 return -ENODEV; 157 } 158 159 return 0; 160 } 161 162 static int 163 isl1208_i2c_get_sr(struct i2c_client *client) 164 { 165 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); 166 } 167 168 static int 169 isl1208_i2c_get_atr(struct i2c_client *client) 170 { 171 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); 172 if (atr < 0) 173 return atr; 174 175 /* The 6bit value in the ATR register controls the load 176 * capacitance C_load * in steps of 0.25pF 177 * 178 * bit (1<<5) of the ATR register is inverted 179 * 180 * C_load(ATR=0x20) = 4.50pF 181 * C_load(ATR=0x00) = 12.50pF 182 * C_load(ATR=0x1f) = 20.25pF 183 * 184 */ 185 186 atr &= 0x3f; /* mask out lsb */ 187 atr ^= 1 << 5; /* invert 6th bit */ 188 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ 189 190 return atr; 191 } 192 193 static int 194 isl1208_i2c_get_dtr(struct i2c_client *client) 195 { 196 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); 197 if (dtr < 0) 198 return -EIO; 199 200 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ 201 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); 202 203 return dtr; 204 } 205 206 static int 207 isl1208_i2c_get_usr(struct i2c_client *client) 208 { 209 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; 210 int ret; 211 212 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, 213 ISL1208_USR_SECTION_LEN); 214 if (ret < 0) 215 return ret; 216 217 return (buf[1] << 8) | buf[0]; 218 } 219 220 static int 221 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) 222 { 223 u8 buf[ISL1208_USR_SECTION_LEN]; 224 225 buf[0] = usr & 0xff; 226 buf[1] = (usr >> 8) & 0xff; 227 228 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, 229 ISL1208_USR_SECTION_LEN); 230 } 231 232 static int 233 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) 234 { 235 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 236 237 if (icr < 0) { 238 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 239 return icr; 240 } 241 242 if (enable) 243 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; 244 else 245 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); 246 247 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); 248 if (icr < 0) { 249 dev_err(&client->dev, "%s: writing INT failed\n", __func__); 250 return icr; 251 } 252 253 return 0; 254 } 255 256 static int 257 isl1208_rtc_proc(struct device *dev, struct seq_file *seq) 258 { 259 struct i2c_client *const client = to_i2c_client(dev); 260 int sr, dtr, atr, usr; 261 262 sr = isl1208_i2c_get_sr(client); 263 if (sr < 0) { 264 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 265 return sr; 266 } 267 268 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", 269 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", 270 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", 271 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", 272 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", 273 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", 274 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); 275 276 seq_printf(seq, "batt_status\t: %s\n", 277 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); 278 279 dtr = isl1208_i2c_get_dtr(client); 280 if (dtr >= 0 - 1) 281 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr); 282 283 atr = isl1208_i2c_get_atr(client); 284 if (atr >= 0) 285 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", 286 atr >> 2, (atr & 0x3) * 25); 287 288 usr = isl1208_i2c_get_usr(client); 289 if (usr >= 0) 290 seq_printf(seq, "user_data\t: 0x%.4x\n", usr); 291 292 return 0; 293 } 294 295 static int 296 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) 297 { 298 int sr; 299 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 300 301 sr = isl1208_i2c_get_sr(client); 302 if (sr < 0) { 303 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 304 return -EIO; 305 } 306 307 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 308 if (sr < 0) { 309 dev_err(&client->dev, "%s: reading RTC section failed\n", 310 __func__); 311 return sr; 312 } 313 314 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); 315 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); 316 317 /* HR field has a more complex interpretation */ 318 { 319 const u8 _hr = regs[ISL1208_REG_HR]; 320 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ 321 tm->tm_hour = bcd2bin(_hr & 0x3f); 322 else { 323 /* 12h format */ 324 tm->tm_hour = bcd2bin(_hr & 0x1f); 325 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ 326 tm->tm_hour += 12; 327 } 328 } 329 330 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); 331 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ 332 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; 333 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); 334 335 return 0; 336 } 337 338 static int 339 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 340 { 341 struct rtc_time *const tm = &alarm->time; 342 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 343 int icr, yr, sr = isl1208_i2c_get_sr(client); 344 345 if (sr < 0) { 346 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 347 return sr; 348 } 349 350 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, 351 ISL1208_ALARM_SECTION_LEN); 352 if (sr < 0) { 353 dev_err(&client->dev, "%s: reading alarm section failed\n", 354 __func__); 355 return sr; 356 } 357 358 /* MSB of each alarm register is an enable bit */ 359 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); 360 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); 361 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); 362 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); 363 tm->tm_mon = 364 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; 365 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); 366 367 /* The alarm doesn't store the year so get it from the rtc section */ 368 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); 369 if (yr < 0) { 370 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); 371 return yr; 372 } 373 tm->tm_year = bcd2bin(yr) + 100; 374 375 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 376 if (icr < 0) { 377 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 378 return icr; 379 } 380 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); 381 382 return 0; 383 } 384 385 static int 386 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 387 { 388 struct rtc_time *alarm_tm = &alarm->time; 389 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 390 const int offs = ISL1208_REG_SCA; 391 struct rtc_time rtc_tm; 392 int err, enable; 393 394 err = isl1208_i2c_read_time(client, &rtc_tm); 395 if (err) 396 return err; 397 398 /* If the alarm time is before the current time disable the alarm */ 399 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0) 400 enable = 0x00; 401 else 402 enable = 0x80; 403 404 /* Program the alarm and enable it for each setting */ 405 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; 406 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; 407 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | 408 ISL1208_REG_HR_MIL | enable; 409 410 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; 411 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; 412 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; 413 414 /* write ALARM registers */ 415 err = isl1208_i2c_set_regs(client, offs, regs, 416 ISL1208_ALARM_SECTION_LEN); 417 if (err < 0) { 418 dev_err(&client->dev, "%s: writing ALARM section failed\n", 419 __func__); 420 return err; 421 } 422 423 err = isl1208_rtc_toggle_alarm(client, enable); 424 if (err) 425 return err; 426 427 return 0; 428 } 429 430 static int 431 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) 432 { 433 return isl1208_i2c_read_time(to_i2c_client(dev), tm); 434 } 435 436 static int 437 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) 438 { 439 int sr; 440 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 441 442 /* The clock has an 8 bit wide bcd-coded register (they never learn) 443 * for the year. tm_year is an offset from 1900 and we are interested 444 * in the 2000-2099 range, so any value less than 100 is invalid. 445 */ 446 if (tm->tm_year < 100) 447 return -EINVAL; 448 449 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); 450 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); 451 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; 452 453 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); 454 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); 455 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); 456 457 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); 458 459 sr = isl1208_i2c_get_sr(client); 460 if (sr < 0) { 461 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 462 return sr; 463 } 464 465 /* set WRTC */ 466 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 467 sr | ISL1208_REG_SR_WRTC); 468 if (sr < 0) { 469 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 470 return sr; 471 } 472 473 /* write RTC registers */ 474 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 475 if (sr < 0) { 476 dev_err(&client->dev, "%s: writing RTC section failed\n", 477 __func__); 478 return sr; 479 } 480 481 /* clear WRTC again */ 482 sr = isl1208_i2c_get_sr(client); 483 if (sr < 0) { 484 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 485 return sr; 486 } 487 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 488 sr & ~ISL1208_REG_SR_WRTC); 489 if (sr < 0) { 490 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 491 return sr; 492 } 493 494 return 0; 495 } 496 497 498 static int 499 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) 500 { 501 return isl1208_i2c_set_time(to_i2c_client(dev), tm); 502 } 503 504 static int 505 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 506 { 507 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); 508 } 509 510 static int 511 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 512 { 513 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); 514 } 515 516 static ssize_t timestamp0_store(struct device *dev, 517 struct device_attribute *attr, 518 const char *buf, size_t count) 519 { 520 struct i2c_client *client = to_i2c_client(dev->parent); 521 int sr; 522 523 sr = isl1208_i2c_get_sr(client); 524 if (sr < 0) { 525 dev_err(dev, "%s: reading SR failed\n", __func__); 526 return sr; 527 } 528 529 sr &= ~ISL1208_REG_SR_EVT; 530 531 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 532 if (sr < 0) 533 dev_err(dev, "%s: writing SR failed\n", 534 __func__); 535 536 return count; 537 }; 538 539 static ssize_t timestamp0_show(struct device *dev, 540 struct device_attribute *attr, char *buf) 541 { 542 struct i2c_client *client = to_i2c_client(dev->parent); 543 u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, }; 544 struct rtc_time tm; 545 int sr; 546 547 sr = isl1208_i2c_get_sr(client); 548 if (sr < 0) { 549 dev_err(dev, "%s: reading SR failed\n", __func__); 550 return sr; 551 } 552 553 if (!(sr & ISL1208_REG_SR_EVT)) 554 return 0; 555 556 sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs, 557 ISL1219_EVT_SECTION_LEN); 558 if (sr < 0) { 559 dev_err(dev, "%s: reading event section failed\n", 560 __func__); 561 return 0; 562 } 563 564 /* MSB of each alarm register is an enable bit */ 565 tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f); 566 tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f); 567 tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f); 568 tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f); 569 tm.tm_mon = 570 bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1; 571 tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100; 572 573 sr = rtc_valid_tm(&tm); 574 if (sr) 575 return sr; 576 577 return sprintf(buf, "%llu\n", 578 (unsigned long long)rtc_tm_to_time64(&tm)); 579 }; 580 581 static DEVICE_ATTR_RW(timestamp0); 582 583 static irqreturn_t 584 isl1208_rtc_interrupt(int irq, void *data) 585 { 586 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 587 struct i2c_client *client = data; 588 struct rtc_device *rtc = i2c_get_clientdata(client); 589 int handled = 0, sr, err; 590 591 /* 592 * I2C reads get NAK'ed if we read straight away after an interrupt? 593 * Using a mdelay/msleep didn't seem to help either, so we work around 594 * this by continually trying to read the register for a short time. 595 */ 596 while (1) { 597 sr = isl1208_i2c_get_sr(client); 598 if (sr >= 0) 599 break; 600 601 if (time_after(jiffies, timeout)) { 602 dev_err(&client->dev, "%s: reading SR failed\n", 603 __func__); 604 return sr; 605 } 606 } 607 608 if (sr & ISL1208_REG_SR_ALM) { 609 dev_dbg(&client->dev, "alarm!\n"); 610 611 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); 612 613 /* Clear the alarm */ 614 sr &= ~ISL1208_REG_SR_ALM; 615 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 616 if (sr < 0) 617 dev_err(&client->dev, "%s: writing SR failed\n", 618 __func__); 619 else 620 handled = 1; 621 622 /* Disable the alarm */ 623 err = isl1208_rtc_toggle_alarm(client, 0); 624 if (err) 625 return err; 626 } 627 628 if (sr & ISL1208_REG_SR_EVT) { 629 sysfs_notify(&rtc->dev.kobj, NULL, 630 dev_attr_timestamp0.attr.name); 631 dev_warn(&client->dev, "event detected"); 632 handled = 1; 633 } 634 635 return handled ? IRQ_HANDLED : IRQ_NONE; 636 } 637 638 static const struct rtc_class_ops isl1208_rtc_ops = { 639 .proc = isl1208_rtc_proc, 640 .read_time = isl1208_rtc_read_time, 641 .set_time = isl1208_rtc_set_time, 642 .read_alarm = isl1208_rtc_read_alarm, 643 .set_alarm = isl1208_rtc_set_alarm, 644 }; 645 646 /* sysfs interface */ 647 648 static ssize_t 649 isl1208_sysfs_show_atrim(struct device *dev, 650 struct device_attribute *attr, char *buf) 651 { 652 int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent)); 653 if (atr < 0) 654 return atr; 655 656 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); 657 } 658 659 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); 660 661 static ssize_t 662 isl1208_sysfs_show_dtrim(struct device *dev, 663 struct device_attribute *attr, char *buf) 664 { 665 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent)); 666 if (dtr < 0) 667 return dtr; 668 669 return sprintf(buf, "%d ppm\n", dtr); 670 } 671 672 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); 673 674 static ssize_t 675 isl1208_sysfs_show_usr(struct device *dev, 676 struct device_attribute *attr, char *buf) 677 { 678 int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent)); 679 if (usr < 0) 680 return usr; 681 682 return sprintf(buf, "0x%.4x\n", usr); 683 } 684 685 static ssize_t 686 isl1208_sysfs_store_usr(struct device *dev, 687 struct device_attribute *attr, 688 const char *buf, size_t count) 689 { 690 int usr = -1; 691 692 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { 693 if (sscanf(buf, "%x", &usr) != 1) 694 return -EINVAL; 695 } else { 696 if (sscanf(buf, "%d", &usr) != 1) 697 return -EINVAL; 698 } 699 700 if (usr < 0 || usr > 0xffff) 701 return -EINVAL; 702 703 if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr)) 704 return -EIO; 705 706 return count; 707 } 708 709 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, 710 isl1208_sysfs_store_usr); 711 712 static struct attribute *isl1208_rtc_attrs[] = { 713 &dev_attr_atrim.attr, 714 &dev_attr_dtrim.attr, 715 &dev_attr_usr.attr, 716 NULL 717 }; 718 719 static const struct attribute_group isl1208_rtc_sysfs_files = { 720 .attrs = isl1208_rtc_attrs, 721 }; 722 723 static struct attribute *isl1219_rtc_attrs[] = { 724 &dev_attr_timestamp0.attr, 725 NULL 726 }; 727 728 static const struct attribute_group isl1219_rtc_sysfs_files = { 729 .attrs = isl1219_rtc_attrs, 730 }; 731 732 static int isl1208_setup_irq(struct i2c_client *client, int irq) 733 { 734 int rc = devm_request_threaded_irq(&client->dev, irq, NULL, 735 isl1208_rtc_interrupt, 736 IRQF_SHARED | IRQF_ONESHOT, 737 isl1208_driver.driver.name, 738 client); 739 if (!rc) { 740 device_init_wakeup(&client->dev, 1); 741 enable_irq_wake(irq); 742 } else { 743 dev_err(&client->dev, 744 "Unable to request irq %d, no alarm support\n", 745 irq); 746 } 747 return rc; 748 } 749 750 static int 751 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) 752 { 753 int rc = 0; 754 struct rtc_device *rtc; 755 int evdet_irq = -1; 756 757 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 758 return -ENODEV; 759 760 if (isl1208_i2c_validate_client(client) < 0) 761 return -ENODEV; 762 763 rtc = devm_rtc_allocate_device(&client->dev); 764 if (IS_ERR(rtc)) 765 return PTR_ERR(rtc); 766 767 rtc->ops = &isl1208_rtc_ops; 768 769 i2c_set_clientdata(client, rtc); 770 771 rc = isl1208_i2c_get_sr(client); 772 if (rc < 0) { 773 dev_err(&client->dev, "reading status failed\n"); 774 return rc; 775 } 776 777 if (rc & ISL1208_REG_SR_RTCF) 778 dev_warn(&client->dev, "rtc power failure detected, " 779 "please set clock.\n"); 780 781 if (id->driver_data == TYPE_ISL1219) { 782 struct device_node *np = client->dev.of_node; 783 u32 evienb; 784 785 rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV); 786 if (rc < 0) { 787 dev_err(&client->dev, "failed to read EV reg\n"); 788 return rc; 789 } 790 rc |= ISL1219_REG_EV_EVEN; 791 if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) { 792 if (evienb) 793 rc |= ISL1219_REG_EV_EVIENB; 794 else 795 rc &= ~ISL1219_REG_EV_EVIENB; 796 } 797 rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc); 798 if (rc < 0) { 799 dev_err(&client->dev, "could not enable tamper detection\n"); 800 return rc; 801 } 802 rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files); 803 if (rc) 804 return rc; 805 evdet_irq = of_irq_get_byname(np, "evdet"); 806 } 807 808 rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files); 809 if (rc) 810 return rc; 811 812 if (client->irq > 0) 813 rc = isl1208_setup_irq(client, client->irq); 814 if (rc) 815 return rc; 816 817 if (evdet_irq > 0 && evdet_irq != client->irq) 818 rc = isl1208_setup_irq(client, evdet_irq); 819 if (rc) 820 return rc; 821 822 return rtc_register_device(rtc); 823 } 824 825 static const struct i2c_device_id isl1208_id[] = { 826 { "isl1208", TYPE_ISL1208 }, 827 { "isl1218", TYPE_ISL1218 }, 828 { "isl1219", TYPE_ISL1219 }, 829 { } 830 }; 831 MODULE_DEVICE_TABLE(i2c, isl1208_id); 832 833 static const struct of_device_id isl1208_of_match[] = { 834 { .compatible = "isil,isl1208" }, 835 { .compatible = "isil,isl1218" }, 836 { .compatible = "isil,isl1219" }, 837 { } 838 }; 839 MODULE_DEVICE_TABLE(of, isl1208_of_match); 840 841 static struct i2c_driver isl1208_driver = { 842 .driver = { 843 .name = "rtc-isl1208", 844 .of_match_table = of_match_ptr(isl1208_of_match), 845 }, 846 .probe = isl1208_probe, 847 .id_table = isl1208_id, 848 }; 849 850 module_i2c_driver(isl1208_driver); 851 852 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>"); 853 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); 854 MODULE_LICENSE("GPL"); 855