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 19 #define DRV_VERSION "0.6" 20 21 22 /* 23 * Ricoh has a family of I2C based RTCs, which differ only slightly from 24 * each other. Differences center on pinout (e.g. how many interrupts, 25 * output clock, etc) and how the control registers are used. The '372 26 * is significant only because that's the one this driver first supported. 27 */ 28 #define RS5C372_REG_SECS 0 29 #define RS5C372_REG_MINS 1 30 #define RS5C372_REG_HOURS 2 31 #define RS5C372_REG_WDAY 3 32 #define RS5C372_REG_DAY 4 33 #define RS5C372_REG_MONTH 5 34 #define RS5C372_REG_YEAR 6 35 #define RS5C372_REG_TRIM 7 36 # define RS5C372_TRIM_XSL 0x80 37 # define RS5C372_TRIM_MASK 0x7F 38 39 #define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */ 40 #define RS5C_REG_ALARM_A_HOURS 9 41 #define RS5C_REG_ALARM_A_WDAY 10 42 43 #define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */ 44 #define RS5C_REG_ALARM_B_HOURS 12 45 #define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */ 46 47 #define RS5C_REG_CTRL1 14 48 # define RS5C_CTRL1_AALE (1 << 7) /* or WALE */ 49 # define RS5C_CTRL1_BALE (1 << 6) /* or DALE */ 50 # define RV5C387_CTRL1_24 (1 << 5) 51 # define RS5C372A_CTRL1_SL1 (1 << 5) 52 # define RS5C_CTRL1_CT_MASK (7 << 0) 53 # define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */ 54 # define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */ 55 #define RS5C_REG_CTRL2 15 56 # define RS5C372_CTRL2_24 (1 << 5) 57 # define R2025_CTRL2_XST (1 << 5) 58 # define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2025S/D */ 59 # define RS5C_CTRL2_CTFG (1 << 2) 60 # define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */ 61 # define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */ 62 63 64 /* to read (style 1) or write registers starting at R */ 65 #define RS5C_ADDR(R) (((R) << 4) | 0) 66 67 68 enum rtc_type { 69 rtc_undef = 0, 70 rtc_r2025sd, 71 rtc_r2221tl, 72 rtc_rs5c372a, 73 rtc_rs5c372b, 74 rtc_rv5c386, 75 rtc_rv5c387a, 76 }; 77 78 static const struct i2c_device_id rs5c372_id[] = { 79 { "r2025sd", rtc_r2025sd }, 80 { "r2221tl", rtc_r2221tl }, 81 { "rs5c372a", rtc_rs5c372a }, 82 { "rs5c372b", rtc_rs5c372b }, 83 { "rv5c386", rtc_rv5c386 }, 84 { "rv5c387a", rtc_rv5c387a }, 85 { } 86 }; 87 MODULE_DEVICE_TABLE(i2c, rs5c372_id); 88 89 /* REVISIT: this assumes that: 90 * - we're in the 21st century, so it's safe to ignore the century 91 * bit for rv5c38[67] (REG_MONTH bit 7); 92 * - we should use ALARM_A not ALARM_B (may be wrong on some boards) 93 */ 94 struct rs5c372 { 95 struct i2c_client *client; 96 struct rtc_device *rtc; 97 enum rtc_type type; 98 unsigned time24:1; 99 unsigned has_irq:1; 100 unsigned smbus:1; 101 char buf[17]; 102 char *regs; 103 }; 104 105 static int rs5c_get_regs(struct rs5c372 *rs5c) 106 { 107 struct i2c_client *client = rs5c->client; 108 struct i2c_msg msgs[] = { 109 { 110 .addr = client->addr, 111 .flags = I2C_M_RD, 112 .len = sizeof(rs5c->buf), 113 .buf = rs5c->buf 114 }, 115 }; 116 117 /* This implements the third reading method from the datasheet, using 118 * an internal address that's reset after each transaction (by STOP) 119 * to 0x0f ... so we read extra registers, and skip the first one. 120 * 121 * The first method doesn't work with the iop3xx adapter driver, on at 122 * least 80219 chips; this works around that bug. 123 * 124 * The third method on the other hand doesn't work for the SMBus-only 125 * configurations, so we use the the first method there, stripping off 126 * the extra register in the process. 127 */ 128 if (rs5c->smbus) { 129 int addr = RS5C_ADDR(RS5C372_REG_SECS); 130 int size = sizeof(rs5c->buf) - 1; 131 132 if (i2c_smbus_read_i2c_block_data(client, addr, size, 133 rs5c->buf + 1) != size) { 134 dev_warn(&client->dev, "can't read registers\n"); 135 return -EIO; 136 } 137 } else { 138 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { 139 dev_warn(&client->dev, "can't read registers\n"); 140 return -EIO; 141 } 142 } 143 144 dev_dbg(&client->dev, 145 "%3ph (%02x) %3ph (%02x), %3ph, %3ph; %02x %02x\n", 146 rs5c->regs + 0, rs5c->regs[3], 147 rs5c->regs + 4, rs5c->regs[7], 148 rs5c->regs + 8, rs5c->regs + 11, 149 rs5c->regs[14], rs5c->regs[15]); 150 151 return 0; 152 } 153 154 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) 155 { 156 unsigned hour; 157 158 if (rs5c->time24) 159 return bcd2bin(reg & 0x3f); 160 161 hour = bcd2bin(reg & 0x1f); 162 if (hour == 12) 163 hour = 0; 164 if (reg & 0x20) 165 hour += 12; 166 return hour; 167 } 168 169 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) 170 { 171 if (rs5c->time24) 172 return bin2bcd(hour); 173 174 if (hour > 12) 175 return 0x20 | bin2bcd(hour - 12); 176 if (hour == 12) 177 return 0x20 | bin2bcd(12); 178 if (hour == 0) 179 return bin2bcd(12); 180 return bin2bcd(hour); 181 } 182 183 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) 184 { 185 struct rs5c372 *rs5c = i2c_get_clientdata(client); 186 int status = rs5c_get_regs(rs5c); 187 188 if (status < 0) 189 return status; 190 191 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); 192 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); 193 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); 194 195 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); 196 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); 197 198 /* tm->tm_mon is zero-based */ 199 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; 200 201 /* year is 1900 + tm->tm_year */ 202 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; 203 204 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 205 "mday=%d, mon=%d, year=%d, wday=%d\n", 206 __func__, 207 tm->tm_sec, tm->tm_min, tm->tm_hour, 208 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 209 210 /* rtc might need initialization */ 211 return rtc_valid_tm(tm); 212 } 213 214 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) 215 { 216 struct rs5c372 *rs5c = i2c_get_clientdata(client); 217 unsigned char buf[7]; 218 int addr; 219 220 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " 221 "mday=%d, mon=%d, year=%d, wday=%d\n", 222 __func__, 223 tm->tm_sec, tm->tm_min, tm->tm_hour, 224 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 225 226 addr = RS5C_ADDR(RS5C372_REG_SECS); 227 buf[0] = bin2bcd(tm->tm_sec); 228 buf[1] = bin2bcd(tm->tm_min); 229 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); 230 buf[3] = bin2bcd(tm->tm_wday); 231 buf[4] = bin2bcd(tm->tm_mday); 232 buf[5] = bin2bcd(tm->tm_mon + 1); 233 buf[6] = bin2bcd(tm->tm_year - 100); 234 235 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { 236 dev_err(&client->dev, "%s: write error\n", __func__); 237 return -EIO; 238 } 239 240 return 0; 241 } 242 243 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 244 #define NEED_TRIM 245 #endif 246 247 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 248 #define NEED_TRIM 249 #endif 250 251 #ifdef NEED_TRIM 252 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) 253 { 254 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 255 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; 256 257 if (osc) 258 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; 259 260 if (trim) { 261 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); 262 tmp &= RS5C372_TRIM_MASK; 263 if (tmp & 0x3e) { 264 int t = tmp & 0x3f; 265 266 if (tmp & 0x40) 267 t = (~t | (s8)0xc0) + 1; 268 else 269 t = t - 1; 270 271 tmp = t * 2; 272 } else 273 tmp = 0; 274 *trim = tmp; 275 } 276 277 return 0; 278 } 279 #endif 280 281 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) 282 { 283 return rs5c372_get_datetime(to_i2c_client(dev), tm); 284 } 285 286 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) 287 { 288 return rs5c372_set_datetime(to_i2c_client(dev), tm); 289 } 290 291 292 static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 293 { 294 struct i2c_client *client = to_i2c_client(dev); 295 struct rs5c372 *rs5c = i2c_get_clientdata(client); 296 unsigned char buf; 297 int status, addr; 298 299 buf = rs5c->regs[RS5C_REG_CTRL1]; 300 301 if (!rs5c->has_irq) 302 return -EINVAL; 303 304 status = rs5c_get_regs(rs5c); 305 if (status < 0) 306 return status; 307 308 addr = RS5C_ADDR(RS5C_REG_CTRL1); 309 if (enabled) 310 buf |= RS5C_CTRL1_AALE; 311 else 312 buf &= ~RS5C_CTRL1_AALE; 313 314 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { 315 dev_warn(dev, "can't update alarm\n"); 316 status = -EIO; 317 } else 318 rs5c->regs[RS5C_REG_CTRL1] = buf; 319 320 return status; 321 } 322 323 324 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, 325 * which only exposes a polled programming interface; and since 326 * these calls map directly to those EFI requests; we don't demand 327 * we have an IRQ for this chip when we go through this API. 328 * 329 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs 330 * though, managed through RTC_AIE_{ON,OFF} requests. 331 */ 332 333 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) 334 { 335 struct i2c_client *client = to_i2c_client(dev); 336 struct rs5c372 *rs5c = i2c_get_clientdata(client); 337 int status; 338 339 status = rs5c_get_regs(rs5c); 340 if (status < 0) 341 return status; 342 343 /* report alarm time */ 344 t->time.tm_sec = 0; 345 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); 346 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); 347 t->time.tm_mday = -1; 348 t->time.tm_mon = -1; 349 t->time.tm_year = -1; 350 t->time.tm_wday = -1; 351 t->time.tm_yday = -1; 352 t->time.tm_isdst = -1; 353 354 /* ... and status */ 355 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); 356 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); 357 358 return 0; 359 } 360 361 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) 362 { 363 struct i2c_client *client = to_i2c_client(dev); 364 struct rs5c372 *rs5c = i2c_get_clientdata(client); 365 int status, addr, i; 366 unsigned char buf[3]; 367 368 /* only handle up to 24 hours in the future, like RTC_ALM_SET */ 369 if (t->time.tm_mday != -1 370 || t->time.tm_mon != -1 371 || t->time.tm_year != -1) 372 return -EINVAL; 373 374 /* REVISIT: round up tm_sec */ 375 376 /* if needed, disable irq (clears pending status) */ 377 status = rs5c_get_regs(rs5c); 378 if (status < 0) 379 return status; 380 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { 381 addr = RS5C_ADDR(RS5C_REG_CTRL1); 382 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; 383 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { 384 dev_dbg(dev, "can't disable alarm\n"); 385 return -EIO; 386 } 387 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 388 } 389 390 /* set alarm */ 391 buf[0] = bin2bcd(t->time.tm_min); 392 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); 393 buf[2] = 0x7f; /* any/all days */ 394 395 for (i = 0; i < sizeof(buf); i++) { 396 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); 397 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { 398 dev_dbg(dev, "can't set alarm time\n"); 399 return -EIO; 400 } 401 } 402 403 /* ... and maybe enable its irq */ 404 if (t->enabled) { 405 addr = RS5C_ADDR(RS5C_REG_CTRL1); 406 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; 407 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) 408 dev_warn(dev, "can't enable alarm\n"); 409 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 410 } 411 412 return 0; 413 } 414 415 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 416 417 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) 418 { 419 int err, osc, trim; 420 421 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); 422 if (err == 0) { 423 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", 424 osc / 1000, osc % 1000); 425 seq_printf(seq, "trim\t\t: %d\n", trim); 426 } 427 428 return 0; 429 } 430 431 #else 432 #define rs5c372_rtc_proc NULL 433 #endif 434 435 static const struct rtc_class_ops rs5c372_rtc_ops = { 436 .proc = rs5c372_rtc_proc, 437 .read_time = rs5c372_rtc_read_time, 438 .set_time = rs5c372_rtc_set_time, 439 .read_alarm = rs5c_read_alarm, 440 .set_alarm = rs5c_set_alarm, 441 .alarm_irq_enable = rs5c_rtc_alarm_irq_enable, 442 }; 443 444 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 445 446 static ssize_t rs5c372_sysfs_show_trim(struct device *dev, 447 struct device_attribute *attr, char *buf) 448 { 449 int err, trim; 450 451 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); 452 if (err) 453 return err; 454 455 return sprintf(buf, "%d\n", trim); 456 } 457 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); 458 459 static ssize_t rs5c372_sysfs_show_osc(struct device *dev, 460 struct device_attribute *attr, char *buf) 461 { 462 int err, osc; 463 464 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); 465 if (err) 466 return err; 467 468 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); 469 } 470 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); 471 472 static int rs5c_sysfs_register(struct device *dev) 473 { 474 int err; 475 476 err = device_create_file(dev, &dev_attr_trim); 477 if (err) 478 return err; 479 err = device_create_file(dev, &dev_attr_osc); 480 if (err) 481 device_remove_file(dev, &dev_attr_trim); 482 483 return err; 484 } 485 486 static void rs5c_sysfs_unregister(struct device *dev) 487 { 488 device_remove_file(dev, &dev_attr_trim); 489 device_remove_file(dev, &dev_attr_osc); 490 } 491 492 #else 493 static int rs5c_sysfs_register(struct device *dev) 494 { 495 return 0; 496 } 497 498 static void rs5c_sysfs_unregister(struct device *dev) 499 { 500 /* nothing */ 501 } 502 #endif /* SYSFS */ 503 504 static struct i2c_driver rs5c372_driver; 505 506 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) 507 { 508 unsigned char buf[2]; 509 int addr, i, ret = 0; 510 511 if (rs5c372->type == rtc_r2025sd) { 512 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)) 513 return ret; 514 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST; 515 } else { 516 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) 517 return ret; 518 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; 519 } 520 521 addr = RS5C_ADDR(RS5C_REG_CTRL1); 522 buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; 523 buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; 524 525 /* use 24hr mode */ 526 switch (rs5c372->type) { 527 case rtc_rs5c372a: 528 case rtc_rs5c372b: 529 buf[1] |= RS5C372_CTRL2_24; 530 rs5c372->time24 = 1; 531 break; 532 case rtc_r2025sd: 533 case rtc_r2221tl: 534 case rtc_rv5c386: 535 case rtc_rv5c387a: 536 buf[0] |= RV5C387_CTRL1_24; 537 rs5c372->time24 = 1; 538 break; 539 default: 540 /* impossible */ 541 break; 542 } 543 544 for (i = 0; i < sizeof(buf); i++) { 545 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); 546 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); 547 if (unlikely(ret < 0)) 548 return ret; 549 } 550 551 rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; 552 rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; 553 554 return 0; 555 } 556 557 static int rs5c372_probe(struct i2c_client *client, 558 const struct i2c_device_id *id) 559 { 560 int err = 0; 561 int smbus_mode = 0; 562 struct rs5c372 *rs5c372; 563 struct rtc_time tm; 564 565 dev_dbg(&client->dev, "%s\n", __func__); 566 567 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 568 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { 569 /* 570 * If we don't have any master mode adapter, try breaking 571 * it down in to the barest of capabilities. 572 */ 573 if (i2c_check_functionality(client->adapter, 574 I2C_FUNC_SMBUS_BYTE_DATA | 575 I2C_FUNC_SMBUS_I2C_BLOCK)) 576 smbus_mode = 1; 577 else { 578 /* Still no good, give up */ 579 err = -ENODEV; 580 goto exit; 581 } 582 } 583 584 rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372), 585 GFP_KERNEL); 586 if (!rs5c372) { 587 err = -ENOMEM; 588 goto exit; 589 } 590 591 rs5c372->client = client; 592 i2c_set_clientdata(client, rs5c372); 593 rs5c372->type = id->driver_data; 594 595 /* we read registers 0x0f then 0x00-0x0f; skip the first one */ 596 rs5c372->regs = &rs5c372->buf[1]; 597 rs5c372->smbus = smbus_mode; 598 599 err = rs5c_get_regs(rs5c372); 600 if (err < 0) 601 goto exit; 602 603 /* clock may be set for am/pm or 24 hr time */ 604 switch (rs5c372->type) { 605 case rtc_rs5c372a: 606 case rtc_rs5c372b: 607 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. 608 * so does periodic irq, except some 327a modes. 609 */ 610 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) 611 rs5c372->time24 = 1; 612 break; 613 case rtc_r2025sd: 614 case rtc_r2221tl: 615 case rtc_rv5c386: 616 case rtc_rv5c387a: 617 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) 618 rs5c372->time24 = 1; 619 /* alarm uses ALARM_W; and nINTRB for alarm and periodic 620 * irq, on both 386 and 387 621 */ 622 break; 623 default: 624 dev_err(&client->dev, "unknown RTC type\n"); 625 goto exit; 626 } 627 628 /* if the oscillator lost power and no other software (like 629 * the bootloader) set it up, do it here. 630 * 631 * The R2025S/D does this a little differently than the other 632 * parts, so we special case that.. 633 */ 634 err = rs5c_oscillator_setup(rs5c372); 635 if (unlikely(err < 0)) { 636 dev_err(&client->dev, "setup error\n"); 637 goto exit; 638 } 639 640 if (rs5c372_get_datetime(client, &tm) < 0) 641 dev_warn(&client->dev, "clock needs to be set\n"); 642 643 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n", 644 ({ char *s; switch (rs5c372->type) { 645 case rtc_r2025sd: s = "r2025sd"; break; 646 case rtc_r2221tl: s = "r2221tl"; break; 647 case rtc_rs5c372a: s = "rs5c372a"; break; 648 case rtc_rs5c372b: s = "rs5c372b"; break; 649 case rtc_rv5c386: s = "rv5c386"; break; 650 case rtc_rv5c387a: s = "rv5c387a"; break; 651 default: s = "chip"; break; 652 }; s;}), 653 rs5c372->time24 ? "24hr" : "am/pm" 654 ); 655 656 /* REVISIT use client->irq to register alarm irq ... */ 657 rs5c372->rtc = devm_rtc_device_register(&client->dev, 658 rs5c372_driver.driver.name, 659 &rs5c372_rtc_ops, THIS_MODULE); 660 661 if (IS_ERR(rs5c372->rtc)) { 662 err = PTR_ERR(rs5c372->rtc); 663 goto exit; 664 } 665 666 err = rs5c_sysfs_register(&client->dev); 667 if (err) 668 goto exit; 669 670 return 0; 671 672 exit: 673 return err; 674 } 675 676 static int rs5c372_remove(struct i2c_client *client) 677 { 678 rs5c_sysfs_unregister(&client->dev); 679 return 0; 680 } 681 682 static struct i2c_driver rs5c372_driver = { 683 .driver = { 684 .name = "rtc-rs5c372", 685 }, 686 .probe = rs5c372_probe, 687 .remove = rs5c372_remove, 688 .id_table = rs5c372_id, 689 }; 690 691 module_i2c_driver(rs5c372_driver); 692 693 MODULE_AUTHOR( 694 "Pavel Mironchik <pmironchik@optifacio.net>, " 695 "Alessandro Zummo <a.zummo@towertech.it>, " 696 "Paul Mundt <lethal@linux-sh.org>"); 697 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); 698 MODULE_LICENSE("GPL"); 699 MODULE_VERSION(DRV_VERSION); 700