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 int ret; 88 89 WARN_ON(reg > ISL1219_REG_YRT); 90 WARN_ON(reg + len > ISL1219_REG_YRT + 1); 91 92 ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); 93 return (ret < 0) ? ret : 0; 94 } 95 96 /* block write */ 97 static int 98 isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], 99 unsigned len) 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_smbus_write_i2c_block_data(client, reg, len, buf); 107 return (ret < 0) ? ret : 0; 108 } 109 110 /* simple check to see whether we have a isl1208 */ 111 static int 112 isl1208_i2c_validate_client(struct i2c_client *client) 113 { 114 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 115 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { 116 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 117 }; 118 int i; 119 int ret; 120 121 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 122 if (ret < 0) 123 return ret; 124 125 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { 126 if (regs[i] & zero_mask[i]) /* check if bits are cleared */ 127 return -ENODEV; 128 } 129 130 return 0; 131 } 132 133 static int 134 isl1208_i2c_get_sr(struct i2c_client *client) 135 { 136 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); 137 } 138 139 static int 140 isl1208_i2c_get_atr(struct i2c_client *client) 141 { 142 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); 143 if (atr < 0) 144 return atr; 145 146 /* The 6bit value in the ATR register controls the load 147 * capacitance C_load * in steps of 0.25pF 148 * 149 * bit (1<<5) of the ATR register is inverted 150 * 151 * C_load(ATR=0x20) = 4.50pF 152 * C_load(ATR=0x00) = 12.50pF 153 * C_load(ATR=0x1f) = 20.25pF 154 * 155 */ 156 157 atr &= 0x3f; /* mask out lsb */ 158 atr ^= 1 << 5; /* invert 6th bit */ 159 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ 160 161 return atr; 162 } 163 164 static int 165 isl1208_i2c_get_dtr(struct i2c_client *client) 166 { 167 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); 168 if (dtr < 0) 169 return -EIO; 170 171 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ 172 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); 173 174 return dtr; 175 } 176 177 static int 178 isl1208_i2c_get_usr(struct i2c_client *client) 179 { 180 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; 181 int ret; 182 183 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, 184 ISL1208_USR_SECTION_LEN); 185 if (ret < 0) 186 return ret; 187 188 return (buf[1] << 8) | buf[0]; 189 } 190 191 static int 192 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) 193 { 194 u8 buf[ISL1208_USR_SECTION_LEN]; 195 196 buf[0] = usr & 0xff; 197 buf[1] = (usr >> 8) & 0xff; 198 199 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, 200 ISL1208_USR_SECTION_LEN); 201 } 202 203 static int 204 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) 205 { 206 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 207 208 if (icr < 0) { 209 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 210 return icr; 211 } 212 213 if (enable) 214 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; 215 else 216 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); 217 218 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); 219 if (icr < 0) { 220 dev_err(&client->dev, "%s: writing INT failed\n", __func__); 221 return icr; 222 } 223 224 return 0; 225 } 226 227 static int 228 isl1208_rtc_proc(struct device *dev, struct seq_file *seq) 229 { 230 struct i2c_client *const client = to_i2c_client(dev); 231 int sr, dtr, atr, usr; 232 233 sr = isl1208_i2c_get_sr(client); 234 if (sr < 0) { 235 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 236 return sr; 237 } 238 239 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", 240 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", 241 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", 242 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", 243 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", 244 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", 245 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); 246 247 seq_printf(seq, "batt_status\t: %s\n", 248 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); 249 250 dtr = isl1208_i2c_get_dtr(client); 251 if (dtr >= 0 - 1) 252 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr); 253 254 atr = isl1208_i2c_get_atr(client); 255 if (atr >= 0) 256 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", 257 atr >> 2, (atr & 0x3) * 25); 258 259 usr = isl1208_i2c_get_usr(client); 260 if (usr >= 0) 261 seq_printf(seq, "user_data\t: 0x%.4x\n", usr); 262 263 return 0; 264 } 265 266 static int 267 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) 268 { 269 int sr; 270 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 271 272 sr = isl1208_i2c_get_sr(client); 273 if (sr < 0) { 274 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 275 return -EIO; 276 } 277 278 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 279 if (sr < 0) { 280 dev_err(&client->dev, "%s: reading RTC section failed\n", 281 __func__); 282 return sr; 283 } 284 285 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); 286 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); 287 288 /* HR field has a more complex interpretation */ 289 { 290 const u8 _hr = regs[ISL1208_REG_HR]; 291 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ 292 tm->tm_hour = bcd2bin(_hr & 0x3f); 293 else { 294 /* 12h format */ 295 tm->tm_hour = bcd2bin(_hr & 0x1f); 296 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ 297 tm->tm_hour += 12; 298 } 299 } 300 301 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); 302 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ 303 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; 304 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); 305 306 return 0; 307 } 308 309 static int 310 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 311 { 312 struct rtc_time *const tm = &alarm->time; 313 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 314 int icr, yr, sr = isl1208_i2c_get_sr(client); 315 316 if (sr < 0) { 317 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 318 return sr; 319 } 320 321 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, 322 ISL1208_ALARM_SECTION_LEN); 323 if (sr < 0) { 324 dev_err(&client->dev, "%s: reading alarm section failed\n", 325 __func__); 326 return sr; 327 } 328 329 /* MSB of each alarm register is an enable bit */ 330 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); 331 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); 332 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); 333 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); 334 tm->tm_mon = 335 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; 336 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); 337 338 /* The alarm doesn't store the year so get it from the rtc section */ 339 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); 340 if (yr < 0) { 341 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__); 342 return yr; 343 } 344 tm->tm_year = bcd2bin(yr) + 100; 345 346 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT); 347 if (icr < 0) { 348 dev_err(&client->dev, "%s: reading INT failed\n", __func__); 349 return icr; 350 } 351 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME); 352 353 return 0; 354 } 355 356 static int 357 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) 358 { 359 struct rtc_time *alarm_tm = &alarm->time; 360 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; 361 const int offs = ISL1208_REG_SCA; 362 struct rtc_time rtc_tm; 363 int err, enable; 364 365 err = isl1208_i2c_read_time(client, &rtc_tm); 366 if (err) 367 return err; 368 369 /* If the alarm time is before the current time disable the alarm */ 370 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0) 371 enable = 0x00; 372 else 373 enable = 0x80; 374 375 /* Program the alarm and enable it for each setting */ 376 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable; 377 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable; 378 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) | 379 ISL1208_REG_HR_MIL | enable; 380 381 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable; 382 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable; 383 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable; 384 385 /* write ALARM registers */ 386 err = isl1208_i2c_set_regs(client, offs, regs, 387 ISL1208_ALARM_SECTION_LEN); 388 if (err < 0) { 389 dev_err(&client->dev, "%s: writing ALARM section failed\n", 390 __func__); 391 return err; 392 } 393 394 err = isl1208_rtc_toggle_alarm(client, enable); 395 if (err) 396 return err; 397 398 return 0; 399 } 400 401 static int 402 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) 403 { 404 return isl1208_i2c_read_time(to_i2c_client(dev), tm); 405 } 406 407 static int 408 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) 409 { 410 int sr; 411 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; 412 413 /* The clock has an 8 bit wide bcd-coded register (they never learn) 414 * for the year. tm_year is an offset from 1900 and we are interested 415 * in the 2000-2099 range, so any value less than 100 is invalid. 416 */ 417 if (tm->tm_year < 100) 418 return -EINVAL; 419 420 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec); 421 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min); 422 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL; 423 424 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday); 425 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1); 426 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100); 427 428 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7); 429 430 sr = isl1208_i2c_get_sr(client); 431 if (sr < 0) { 432 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 433 return sr; 434 } 435 436 /* set WRTC */ 437 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 438 sr | ISL1208_REG_SR_WRTC); 439 if (sr < 0) { 440 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 441 return sr; 442 } 443 444 /* write RTC registers */ 445 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); 446 if (sr < 0) { 447 dev_err(&client->dev, "%s: writing RTC section failed\n", 448 __func__); 449 return sr; 450 } 451 452 /* clear WRTC again */ 453 sr = isl1208_i2c_get_sr(client); 454 if (sr < 0) { 455 dev_err(&client->dev, "%s: reading SR failed\n", __func__); 456 return sr; 457 } 458 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, 459 sr & ~ISL1208_REG_SR_WRTC); 460 if (sr < 0) { 461 dev_err(&client->dev, "%s: writing SR failed\n", __func__); 462 return sr; 463 } 464 465 return 0; 466 } 467 468 469 static int 470 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) 471 { 472 return isl1208_i2c_set_time(to_i2c_client(dev), tm); 473 } 474 475 static int 476 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) 477 { 478 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm); 479 } 480 481 static int 482 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) 483 { 484 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm); 485 } 486 487 static ssize_t timestamp0_store(struct device *dev, 488 struct device_attribute *attr, 489 const char *buf, size_t count) 490 { 491 struct i2c_client *client = to_i2c_client(dev->parent); 492 int sr; 493 494 sr = isl1208_i2c_get_sr(client); 495 if (sr < 0) { 496 dev_err(dev, "%s: reading SR failed\n", __func__); 497 return sr; 498 } 499 500 sr &= ~ISL1208_REG_SR_EVT; 501 502 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 503 if (sr < 0) 504 dev_err(dev, "%s: writing SR failed\n", 505 __func__); 506 507 return count; 508 }; 509 510 static ssize_t timestamp0_show(struct device *dev, 511 struct device_attribute *attr, char *buf) 512 { 513 struct i2c_client *client = to_i2c_client(dev->parent); 514 u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, }; 515 struct rtc_time tm; 516 int sr; 517 518 sr = isl1208_i2c_get_sr(client); 519 if (sr < 0) { 520 dev_err(dev, "%s: reading SR failed\n", __func__); 521 return sr; 522 } 523 524 if (!(sr & ISL1208_REG_SR_EVT)) 525 return 0; 526 527 sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs, 528 ISL1219_EVT_SECTION_LEN); 529 if (sr < 0) { 530 dev_err(dev, "%s: reading event section failed\n", 531 __func__); 532 return 0; 533 } 534 535 /* MSB of each alarm register is an enable bit */ 536 tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f); 537 tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f); 538 tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f); 539 tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f); 540 tm.tm_mon = 541 bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1; 542 tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100; 543 544 sr = rtc_valid_tm(&tm); 545 if (sr) 546 return sr; 547 548 return sprintf(buf, "%llu\n", 549 (unsigned long long)rtc_tm_to_time64(&tm)); 550 }; 551 552 static DEVICE_ATTR_RW(timestamp0); 553 554 static irqreturn_t 555 isl1208_rtc_interrupt(int irq, void *data) 556 { 557 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 558 struct i2c_client *client = data; 559 struct rtc_device *rtc = i2c_get_clientdata(client); 560 int handled = 0, sr, err; 561 562 /* 563 * I2C reads get NAK'ed if we read straight away after an interrupt? 564 * Using a mdelay/msleep didn't seem to help either, so we work around 565 * this by continually trying to read the register for a short time. 566 */ 567 while (1) { 568 sr = isl1208_i2c_get_sr(client); 569 if (sr >= 0) 570 break; 571 572 if (time_after(jiffies, timeout)) { 573 dev_err(&client->dev, "%s: reading SR failed\n", 574 __func__); 575 return sr; 576 } 577 } 578 579 if (sr & ISL1208_REG_SR_ALM) { 580 dev_dbg(&client->dev, "alarm!\n"); 581 582 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF); 583 584 /* Clear the alarm */ 585 sr &= ~ISL1208_REG_SR_ALM; 586 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); 587 if (sr < 0) 588 dev_err(&client->dev, "%s: writing SR failed\n", 589 __func__); 590 else 591 handled = 1; 592 593 /* Disable the alarm */ 594 err = isl1208_rtc_toggle_alarm(client, 0); 595 if (err) 596 return err; 597 } 598 599 if (sr & ISL1208_REG_SR_EVT) { 600 sysfs_notify(&rtc->dev.kobj, NULL, 601 dev_attr_timestamp0.attr.name); 602 dev_warn(&client->dev, "event detected"); 603 handled = 1; 604 } 605 606 return handled ? IRQ_HANDLED : IRQ_NONE; 607 } 608 609 static const struct rtc_class_ops isl1208_rtc_ops = { 610 .proc = isl1208_rtc_proc, 611 .read_time = isl1208_rtc_read_time, 612 .set_time = isl1208_rtc_set_time, 613 .read_alarm = isl1208_rtc_read_alarm, 614 .set_alarm = isl1208_rtc_set_alarm, 615 }; 616 617 /* sysfs interface */ 618 619 static ssize_t 620 isl1208_sysfs_show_atrim(struct device *dev, 621 struct device_attribute *attr, char *buf) 622 { 623 int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent)); 624 if (atr < 0) 625 return atr; 626 627 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25); 628 } 629 630 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL); 631 632 static ssize_t 633 isl1208_sysfs_show_dtrim(struct device *dev, 634 struct device_attribute *attr, char *buf) 635 { 636 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent)); 637 if (dtr < 0) 638 return dtr; 639 640 return sprintf(buf, "%d ppm\n", dtr); 641 } 642 643 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL); 644 645 static ssize_t 646 isl1208_sysfs_show_usr(struct device *dev, 647 struct device_attribute *attr, char *buf) 648 { 649 int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent)); 650 if (usr < 0) 651 return usr; 652 653 return sprintf(buf, "0x%.4x\n", usr); 654 } 655 656 static ssize_t 657 isl1208_sysfs_store_usr(struct device *dev, 658 struct device_attribute *attr, 659 const char *buf, size_t count) 660 { 661 int usr = -1; 662 663 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) { 664 if (sscanf(buf, "%x", &usr) != 1) 665 return -EINVAL; 666 } else { 667 if (sscanf(buf, "%d", &usr) != 1) 668 return -EINVAL; 669 } 670 671 if (usr < 0 || usr > 0xffff) 672 return -EINVAL; 673 674 if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr)) 675 return -EIO; 676 677 return count; 678 } 679 680 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, 681 isl1208_sysfs_store_usr); 682 683 static struct attribute *isl1208_rtc_attrs[] = { 684 &dev_attr_atrim.attr, 685 &dev_attr_dtrim.attr, 686 &dev_attr_usr.attr, 687 NULL 688 }; 689 690 static const struct attribute_group isl1208_rtc_sysfs_files = { 691 .attrs = isl1208_rtc_attrs, 692 }; 693 694 static struct attribute *isl1219_rtc_attrs[] = { 695 &dev_attr_timestamp0.attr, 696 NULL 697 }; 698 699 static const struct attribute_group isl1219_rtc_sysfs_files = { 700 .attrs = isl1219_rtc_attrs, 701 }; 702 703 static int isl1208_setup_irq(struct i2c_client *client, int irq) 704 { 705 int rc = devm_request_threaded_irq(&client->dev, irq, NULL, 706 isl1208_rtc_interrupt, 707 IRQF_SHARED | IRQF_ONESHOT, 708 isl1208_driver.driver.name, 709 client); 710 if (!rc) { 711 device_init_wakeup(&client->dev, 1); 712 enable_irq_wake(irq); 713 } else { 714 dev_err(&client->dev, 715 "Unable to request irq %d, no alarm support\n", 716 irq); 717 } 718 return rc; 719 } 720 721 static int 722 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id) 723 { 724 int rc = 0; 725 struct rtc_device *rtc; 726 int evdet_irq = -1; 727 728 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 729 return -ENODEV; 730 731 if (isl1208_i2c_validate_client(client) < 0) 732 return -ENODEV; 733 734 rtc = devm_rtc_allocate_device(&client->dev); 735 if (IS_ERR(rtc)) 736 return PTR_ERR(rtc); 737 738 rtc->ops = &isl1208_rtc_ops; 739 740 i2c_set_clientdata(client, rtc); 741 742 rc = isl1208_i2c_get_sr(client); 743 if (rc < 0) { 744 dev_err(&client->dev, "reading status failed\n"); 745 return rc; 746 } 747 748 if (rc & ISL1208_REG_SR_RTCF) 749 dev_warn(&client->dev, "rtc power failure detected, " 750 "please set clock.\n"); 751 752 if (id->driver_data == TYPE_ISL1219) { 753 struct device_node *np = client->dev.of_node; 754 u32 evienb; 755 756 rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV); 757 if (rc < 0) { 758 dev_err(&client->dev, "failed to read EV reg\n"); 759 return rc; 760 } 761 rc |= ISL1219_REG_EV_EVEN; 762 if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) { 763 if (evienb) 764 rc |= ISL1219_REG_EV_EVIENB; 765 else 766 rc &= ~ISL1219_REG_EV_EVIENB; 767 } 768 rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc); 769 if (rc < 0) { 770 dev_err(&client->dev, "could not enable tamper detection\n"); 771 return rc; 772 } 773 rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files); 774 if (rc) 775 return rc; 776 evdet_irq = of_irq_get_byname(np, "evdet"); 777 } 778 779 rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files); 780 if (rc) 781 return rc; 782 783 if (client->irq > 0) 784 rc = isl1208_setup_irq(client, client->irq); 785 if (rc) 786 return rc; 787 788 if (evdet_irq > 0 && evdet_irq != client->irq) 789 rc = isl1208_setup_irq(client, evdet_irq); 790 if (rc) 791 return rc; 792 793 return rtc_register_device(rtc); 794 } 795 796 static const struct i2c_device_id isl1208_id[] = { 797 { "isl1208", TYPE_ISL1208 }, 798 { "isl1218", TYPE_ISL1218 }, 799 { "isl1219", TYPE_ISL1219 }, 800 { } 801 }; 802 MODULE_DEVICE_TABLE(i2c, isl1208_id); 803 804 static const struct of_device_id isl1208_of_match[] = { 805 { .compatible = "isil,isl1208" }, 806 { .compatible = "isil,isl1218" }, 807 { .compatible = "isil,isl1219" }, 808 { } 809 }; 810 MODULE_DEVICE_TABLE(of, isl1208_of_match); 811 812 static struct i2c_driver isl1208_driver = { 813 .driver = { 814 .name = "rtc-isl1208", 815 .of_match_table = of_match_ptr(isl1208_of_match), 816 }, 817 .probe = isl1208_probe, 818 .id_table = isl1208_id, 819 }; 820 821 module_i2c_driver(isl1208_driver); 822 823 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>"); 824 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver"); 825 MODULE_LICENSE("GPL"); 826