1 /* 2 * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs 3 * 4 * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net> 5 * Copyright (C) 2006 Tower Technologies 6 * Copyright (C) 2008 Paul Mundt 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/i2c.h> 14 #include <linux/rtc.h> 15 #include <linux/bcd.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 #include <linux/of_device.h> 19 20 /* 21 * Ricoh has a family of I2C based RTCs, which differ only slightly from 22 * each other. Differences center on pinout (e.g. how many interrupts, 23 * output clock, etc) and how the control registers are used. The '372 24 * is significant only because that's the one this driver first supported. 25 */ 26 #define RS5C372_REG_SECS 0 27 #define RS5C372_REG_MINS 1 28 #define RS5C372_REG_HOURS 2 29 #define RS5C372_REG_WDAY 3 30 #define RS5C372_REG_DAY 4 31 #define RS5C372_REG_MONTH 5 32 #define RS5C372_REG_YEAR 6 33 #define RS5C372_REG_TRIM 7 34 # define RS5C372_TRIM_XSL 0x80 35 # define RS5C372_TRIM_MASK 0x7F 36 37 #define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */ 38 #define RS5C_REG_ALARM_A_HOURS 9 39 #define RS5C_REG_ALARM_A_WDAY 10 40 41 #define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */ 42 #define RS5C_REG_ALARM_B_HOURS 12 43 #define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */ 44 45 #define RS5C_REG_CTRL1 14 46 # define RS5C_CTRL1_AALE (1 << 7) /* or WALE */ 47 # define RS5C_CTRL1_BALE (1 << 6) /* or DALE */ 48 # define RV5C387_CTRL1_24 (1 << 5) 49 # define RS5C372A_CTRL1_SL1 (1 << 5) 50 # define RS5C_CTRL1_CT_MASK (7 << 0) 51 # define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */ 52 # define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */ 53 #define RS5C_REG_CTRL2 15 54 # define RS5C372_CTRL2_24 (1 << 5) 55 # define R2025_CTRL2_XST (1 << 5) 56 # define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2025S/D */ 57 # define RS5C_CTRL2_CTFG (1 << 2) 58 # define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */ 59 # define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */ 60 61 62 /* to read (style 1) or write registers starting at R */ 63 #define RS5C_ADDR(R) (((R) << 4) | 0) 64 65 66 enum rtc_type { 67 rtc_undef = 0, 68 rtc_r2025sd, 69 rtc_r2221tl, 70 rtc_rs5c372a, 71 rtc_rs5c372b, 72 rtc_rv5c386, 73 rtc_rv5c387a, 74 }; 75 76 static const struct i2c_device_id rs5c372_id[] = { 77 { "r2025sd", rtc_r2025sd }, 78 { "r2221tl", rtc_r2221tl }, 79 { "rs5c372a", rtc_rs5c372a }, 80 { "rs5c372b", rtc_rs5c372b }, 81 { "rv5c386", rtc_rv5c386 }, 82 { "rv5c387a", rtc_rv5c387a }, 83 { } 84 }; 85 MODULE_DEVICE_TABLE(i2c, rs5c372_id); 86 87 static const struct of_device_id rs5c372_of_match[] = { 88 { 89 .compatible = "ricoh,r2025sd", 90 .data = (void *)rtc_r2025sd 91 }, 92 { 93 .compatible = "ricoh,r2221tl", 94 .data = (void *)rtc_r2221tl 95 }, 96 { 97 .compatible = "ricoh,rs5c372a", 98 .data = (void *)rtc_rs5c372a 99 }, 100 { 101 .compatible = "ricoh,rs5c372b", 102 .data = (void *)rtc_rs5c372b 103 }, 104 { 105 .compatible = "ricoh,rv5c386", 106 .data = (void *)rtc_rv5c386 107 }, 108 { 109 .compatible = "ricoh,rv5c387a", 110 .data = (void *)rtc_rv5c387a 111 }, 112 { } 113 }; 114 MODULE_DEVICE_TABLE(of, rs5c372_of_match); 115 116 /* REVISIT: this assumes that: 117 * - we're in the 21st century, so it's safe to ignore the century 118 * bit for rv5c38[67] (REG_MONTH bit 7); 119 * - we should use ALARM_A not ALARM_B (may be wrong on some boards) 120 */ 121 struct rs5c372 { 122 struct i2c_client *client; 123 struct rtc_device *rtc; 124 enum rtc_type type; 125 unsigned time24:1; 126 unsigned has_irq:1; 127 unsigned smbus:1; 128 char buf[17]; 129 char *regs; 130 }; 131 132 static int rs5c_get_regs(struct rs5c372 *rs5c) 133 { 134 struct i2c_client *client = rs5c->client; 135 struct i2c_msg msgs[] = { 136 { 137 .addr = client->addr, 138 .flags = I2C_M_RD, 139 .len = sizeof(rs5c->buf), 140 .buf = rs5c->buf 141 }, 142 }; 143 144 /* This implements the third reading method from the datasheet, using 145 * an internal address that's reset after each transaction (by STOP) 146 * to 0x0f ... so we read extra registers, and skip the first one. 147 * 148 * The first method doesn't work with the iop3xx adapter driver, on at 149 * least 80219 chips; this works around that bug. 150 * 151 * The third method on the other hand doesn't work for the SMBus-only 152 * configurations, so we use the the first method there, stripping off 153 * the extra register in the process. 154 */ 155 if (rs5c->smbus) { 156 int addr = RS5C_ADDR(RS5C372_REG_SECS); 157 int size = sizeof(rs5c->buf) - 1; 158 159 if (i2c_smbus_read_i2c_block_data(client, addr, size, 160 rs5c->buf + 1) != size) { 161 dev_warn(&client->dev, "can't read registers\n"); 162 return -EIO; 163 } 164 } else { 165 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { 166 dev_warn(&client->dev, "can't read registers\n"); 167 return -EIO; 168 } 169 } 170 171 dev_dbg(&client->dev, 172 "%3ph (%02x) %3ph (%02x), %3ph, %3ph; %02x %02x\n", 173 rs5c->regs + 0, rs5c->regs[3], 174 rs5c->regs + 4, rs5c->regs[7], 175 rs5c->regs + 8, rs5c->regs + 11, 176 rs5c->regs[14], rs5c->regs[15]); 177 178 return 0; 179 } 180 181 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) 182 { 183 unsigned hour; 184 185 if (rs5c->time24) 186 return bcd2bin(reg & 0x3f); 187 188 hour = bcd2bin(reg & 0x1f); 189 if (hour == 12) 190 hour = 0; 191 if (reg & 0x20) 192 hour += 12; 193 return hour; 194 } 195 196 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) 197 { 198 if (rs5c->time24) 199 return bin2bcd(hour); 200 201 if (hour > 12) 202 return 0x20 | bin2bcd(hour - 12); 203 if (hour == 12) 204 return 0x20 | bin2bcd(12); 205 if (hour == 0) 206 return bin2bcd(12); 207 return bin2bcd(hour); 208 } 209 210 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) 211 { 212 struct rs5c372 *rs5c = i2c_get_clientdata(client); 213 int status = rs5c_get_regs(rs5c); 214 215 if (status < 0) 216 return status; 217 218 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); 219 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); 220 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); 221 222 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); 223 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); 224 225 /* tm->tm_mon is zero-based */ 226 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; 227 228 /* year is 1900 + tm->tm_year */ 229 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; 230 231 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 232 "mday=%d, mon=%d, year=%d, wday=%d\n", 233 __func__, 234 tm->tm_sec, tm->tm_min, tm->tm_hour, 235 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 236 237 /* rtc might need initialization */ 238 return rtc_valid_tm(tm); 239 } 240 241 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) 242 { 243 struct rs5c372 *rs5c = i2c_get_clientdata(client); 244 unsigned char buf[7]; 245 int addr; 246 247 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " 248 "mday=%d, mon=%d, year=%d, wday=%d\n", 249 __func__, 250 tm->tm_sec, tm->tm_min, tm->tm_hour, 251 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 252 253 addr = RS5C_ADDR(RS5C372_REG_SECS); 254 buf[0] = bin2bcd(tm->tm_sec); 255 buf[1] = bin2bcd(tm->tm_min); 256 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); 257 buf[3] = bin2bcd(tm->tm_wday); 258 buf[4] = bin2bcd(tm->tm_mday); 259 buf[5] = bin2bcd(tm->tm_mon + 1); 260 buf[6] = bin2bcd(tm->tm_year - 100); 261 262 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { 263 dev_err(&client->dev, "%s: write error\n", __func__); 264 return -EIO; 265 } 266 267 return 0; 268 } 269 270 #if IS_ENABLED(CONFIG_RTC_INTF_PROC) 271 #define NEED_TRIM 272 #endif 273 274 #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) 275 #define NEED_TRIM 276 #endif 277 278 #ifdef NEED_TRIM 279 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) 280 { 281 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 282 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; 283 284 if (osc) 285 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; 286 287 if (trim) { 288 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); 289 tmp &= RS5C372_TRIM_MASK; 290 if (tmp & 0x3e) { 291 int t = tmp & 0x3f; 292 293 if (tmp & 0x40) 294 t = (~t | (s8)0xc0) + 1; 295 else 296 t = t - 1; 297 298 tmp = t * 2; 299 } else 300 tmp = 0; 301 *trim = tmp; 302 } 303 304 return 0; 305 } 306 #endif 307 308 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) 309 { 310 return rs5c372_get_datetime(to_i2c_client(dev), tm); 311 } 312 313 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) 314 { 315 return rs5c372_set_datetime(to_i2c_client(dev), tm); 316 } 317 318 319 static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 320 { 321 struct i2c_client *client = to_i2c_client(dev); 322 struct rs5c372 *rs5c = i2c_get_clientdata(client); 323 unsigned char buf; 324 int status, addr; 325 326 buf = rs5c->regs[RS5C_REG_CTRL1]; 327 328 if (!rs5c->has_irq) 329 return -EINVAL; 330 331 status = rs5c_get_regs(rs5c); 332 if (status < 0) 333 return status; 334 335 addr = RS5C_ADDR(RS5C_REG_CTRL1); 336 if (enabled) 337 buf |= RS5C_CTRL1_AALE; 338 else 339 buf &= ~RS5C_CTRL1_AALE; 340 341 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { 342 dev_warn(dev, "can't update alarm\n"); 343 status = -EIO; 344 } else 345 rs5c->regs[RS5C_REG_CTRL1] = buf; 346 347 return status; 348 } 349 350 351 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, 352 * which only exposes a polled programming interface; and since 353 * these calls map directly to those EFI requests; we don't demand 354 * we have an IRQ for this chip when we go through this API. 355 * 356 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs 357 * though, managed through RTC_AIE_{ON,OFF} requests. 358 */ 359 360 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) 361 { 362 struct i2c_client *client = to_i2c_client(dev); 363 struct rs5c372 *rs5c = i2c_get_clientdata(client); 364 int status; 365 366 status = rs5c_get_regs(rs5c); 367 if (status < 0) 368 return status; 369 370 /* report alarm time */ 371 t->time.tm_sec = 0; 372 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); 373 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); 374 375 /* ... and status */ 376 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); 377 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); 378 379 return 0; 380 } 381 382 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) 383 { 384 struct i2c_client *client = to_i2c_client(dev); 385 struct rs5c372 *rs5c = i2c_get_clientdata(client); 386 int status, addr, i; 387 unsigned char buf[3]; 388 389 /* only handle up to 24 hours in the future, like RTC_ALM_SET */ 390 if (t->time.tm_mday != -1 391 || t->time.tm_mon != -1 392 || t->time.tm_year != -1) 393 return -EINVAL; 394 395 /* REVISIT: round up tm_sec */ 396 397 /* if needed, disable irq (clears pending status) */ 398 status = rs5c_get_regs(rs5c); 399 if (status < 0) 400 return status; 401 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { 402 addr = RS5C_ADDR(RS5C_REG_CTRL1); 403 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; 404 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { 405 dev_dbg(dev, "can't disable alarm\n"); 406 return -EIO; 407 } 408 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 409 } 410 411 /* set alarm */ 412 buf[0] = bin2bcd(t->time.tm_min); 413 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); 414 buf[2] = 0x7f; /* any/all days */ 415 416 for (i = 0; i < sizeof(buf); i++) { 417 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); 418 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { 419 dev_dbg(dev, "can't set alarm time\n"); 420 return -EIO; 421 } 422 } 423 424 /* ... and maybe enable its irq */ 425 if (t->enabled) { 426 addr = RS5C_ADDR(RS5C_REG_CTRL1); 427 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; 428 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) 429 dev_warn(dev, "can't enable alarm\n"); 430 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 431 } 432 433 return 0; 434 } 435 436 #if IS_ENABLED(CONFIG_RTC_INTF_PROC) 437 438 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) 439 { 440 int err, osc, trim; 441 442 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); 443 if (err == 0) { 444 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", 445 osc / 1000, osc % 1000); 446 seq_printf(seq, "trim\t\t: %d\n", trim); 447 } 448 449 return 0; 450 } 451 452 #else 453 #define rs5c372_rtc_proc NULL 454 #endif 455 456 static const struct rtc_class_ops rs5c372_rtc_ops = { 457 .proc = rs5c372_rtc_proc, 458 .read_time = rs5c372_rtc_read_time, 459 .set_time = rs5c372_rtc_set_time, 460 .read_alarm = rs5c_read_alarm, 461 .set_alarm = rs5c_set_alarm, 462 .alarm_irq_enable = rs5c_rtc_alarm_irq_enable, 463 }; 464 465 #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) 466 467 static ssize_t rs5c372_sysfs_show_trim(struct device *dev, 468 struct device_attribute *attr, char *buf) 469 { 470 int err, trim; 471 472 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); 473 if (err) 474 return err; 475 476 return sprintf(buf, "%d\n", trim); 477 } 478 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); 479 480 static ssize_t rs5c372_sysfs_show_osc(struct device *dev, 481 struct device_attribute *attr, char *buf) 482 { 483 int err, osc; 484 485 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); 486 if (err) 487 return err; 488 489 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); 490 } 491 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); 492 493 static int rs5c_sysfs_register(struct device *dev) 494 { 495 int err; 496 497 err = device_create_file(dev, &dev_attr_trim); 498 if (err) 499 return err; 500 err = device_create_file(dev, &dev_attr_osc); 501 if (err) 502 device_remove_file(dev, &dev_attr_trim); 503 504 return err; 505 } 506 507 static void rs5c_sysfs_unregister(struct device *dev) 508 { 509 device_remove_file(dev, &dev_attr_trim); 510 device_remove_file(dev, &dev_attr_osc); 511 } 512 513 #else 514 static int rs5c_sysfs_register(struct device *dev) 515 { 516 return 0; 517 } 518 519 static void rs5c_sysfs_unregister(struct device *dev) 520 { 521 /* nothing */ 522 } 523 #endif /* SYSFS */ 524 525 static struct i2c_driver rs5c372_driver; 526 527 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) 528 { 529 unsigned char buf[2]; 530 int addr, i, ret = 0; 531 532 if (rs5c372->type == rtc_r2025sd) { 533 if (rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST) 534 return ret; 535 rs5c372->regs[RS5C_REG_CTRL2] |= R2025_CTRL2_XST; 536 } else { 537 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) 538 return ret; 539 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; 540 } 541 542 addr = RS5C_ADDR(RS5C_REG_CTRL1); 543 buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; 544 buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; 545 546 /* use 24hr mode */ 547 switch (rs5c372->type) { 548 case rtc_rs5c372a: 549 case rtc_rs5c372b: 550 buf[1] |= RS5C372_CTRL2_24; 551 rs5c372->time24 = 1; 552 break; 553 case rtc_r2025sd: 554 case rtc_r2221tl: 555 case rtc_rv5c386: 556 case rtc_rv5c387a: 557 buf[0] |= RV5C387_CTRL1_24; 558 rs5c372->time24 = 1; 559 break; 560 default: 561 /* impossible */ 562 break; 563 } 564 565 for (i = 0; i < sizeof(buf); i++) { 566 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); 567 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); 568 if (unlikely(ret < 0)) 569 return ret; 570 } 571 572 rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; 573 rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; 574 575 return 0; 576 } 577 578 static int rs5c372_probe(struct i2c_client *client, 579 const struct i2c_device_id *id) 580 { 581 int err = 0; 582 int smbus_mode = 0; 583 struct rs5c372 *rs5c372; 584 struct rtc_time tm; 585 586 dev_dbg(&client->dev, "%s\n", __func__); 587 588 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 589 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { 590 /* 591 * If we don't have any master mode adapter, try breaking 592 * it down in to the barest of capabilities. 593 */ 594 if (i2c_check_functionality(client->adapter, 595 I2C_FUNC_SMBUS_BYTE_DATA | 596 I2C_FUNC_SMBUS_I2C_BLOCK)) 597 smbus_mode = 1; 598 else { 599 /* Still no good, give up */ 600 err = -ENODEV; 601 goto exit; 602 } 603 } 604 605 rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372), 606 GFP_KERNEL); 607 if (!rs5c372) { 608 err = -ENOMEM; 609 goto exit; 610 } 611 612 rs5c372->client = client; 613 i2c_set_clientdata(client, rs5c372); 614 if (client->dev.of_node) 615 rs5c372->type = (enum rtc_type) 616 of_device_get_match_data(&client->dev); 617 else 618 rs5c372->type = id->driver_data; 619 620 /* we read registers 0x0f then 0x00-0x0f; skip the first one */ 621 rs5c372->regs = &rs5c372->buf[1]; 622 rs5c372->smbus = smbus_mode; 623 624 err = rs5c_get_regs(rs5c372); 625 if (err < 0) 626 goto exit; 627 628 /* clock may be set for am/pm or 24 hr time */ 629 switch (rs5c372->type) { 630 case rtc_rs5c372a: 631 case rtc_rs5c372b: 632 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. 633 * so does periodic irq, except some 327a modes. 634 */ 635 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) 636 rs5c372->time24 = 1; 637 break; 638 case rtc_r2025sd: 639 case rtc_r2221tl: 640 case rtc_rv5c386: 641 case rtc_rv5c387a: 642 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) 643 rs5c372->time24 = 1; 644 /* alarm uses ALARM_W; and nINTRB for alarm and periodic 645 * irq, on both 386 and 387 646 */ 647 break; 648 default: 649 dev_err(&client->dev, "unknown RTC type\n"); 650 goto exit; 651 } 652 653 /* if the oscillator lost power and no other software (like 654 * the bootloader) set it up, do it here. 655 * 656 * The R2025S/D does this a little differently than the other 657 * parts, so we special case that.. 658 */ 659 err = rs5c_oscillator_setup(rs5c372); 660 if (unlikely(err < 0)) { 661 dev_err(&client->dev, "setup error\n"); 662 goto exit; 663 } 664 665 if (rs5c372_get_datetime(client, &tm) < 0) 666 dev_warn(&client->dev, "clock needs to be set\n"); 667 668 dev_info(&client->dev, "%s found, %s\n", 669 ({ char *s; switch (rs5c372->type) { 670 case rtc_r2025sd: s = "r2025sd"; break; 671 case rtc_r2221tl: s = "r2221tl"; break; 672 case rtc_rs5c372a: s = "rs5c372a"; break; 673 case rtc_rs5c372b: s = "rs5c372b"; break; 674 case rtc_rv5c386: s = "rv5c386"; break; 675 case rtc_rv5c387a: s = "rv5c387a"; break; 676 default: s = "chip"; break; 677 }; s;}), 678 rs5c372->time24 ? "24hr" : "am/pm" 679 ); 680 681 /* REVISIT use client->irq to register alarm irq ... */ 682 rs5c372->rtc = devm_rtc_device_register(&client->dev, 683 rs5c372_driver.driver.name, 684 &rs5c372_rtc_ops, THIS_MODULE); 685 686 if (IS_ERR(rs5c372->rtc)) { 687 err = PTR_ERR(rs5c372->rtc); 688 goto exit; 689 } 690 691 err = rs5c_sysfs_register(&client->dev); 692 if (err) 693 goto exit; 694 695 return 0; 696 697 exit: 698 return err; 699 } 700 701 static int rs5c372_remove(struct i2c_client *client) 702 { 703 rs5c_sysfs_unregister(&client->dev); 704 return 0; 705 } 706 707 static struct i2c_driver rs5c372_driver = { 708 .driver = { 709 .name = "rtc-rs5c372", 710 .of_match_table = of_match_ptr(rs5c372_of_match), 711 }, 712 .probe = rs5c372_probe, 713 .remove = rs5c372_remove, 714 .id_table = rs5c372_id, 715 }; 716 717 module_i2c_driver(rs5c372_driver); 718 719 MODULE_AUTHOR( 720 "Pavel Mironchik <pmironchik@optifacio.net>, " 721 "Alessandro Zummo <a.zummo@towertech.it>, " 722 "Paul Mundt <lethal@linux-sh.org>"); 723 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); 724 MODULE_LICENSE("GPL"); 725