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 17 #define DRV_VERSION "0.6" 18 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_rs5c372a, 70 rtc_rs5c372b, 71 rtc_rv5c386, 72 rtc_rv5c387a, 73 }; 74 75 static const struct i2c_device_id rs5c372_id[] = { 76 { "r2025sd", rtc_r2025sd }, 77 { "rs5c372a", rtc_rs5c372a }, 78 { "rs5c372b", rtc_rs5c372b }, 79 { "rv5c386", rtc_rv5c386 }, 80 { "rv5c387a", rtc_rv5c387a }, 81 { } 82 }; 83 MODULE_DEVICE_TABLE(i2c, rs5c372_id); 84 85 /* REVISIT: this assumes that: 86 * - we're in the 21st century, so it's safe to ignore the century 87 * bit for rv5c38[67] (REG_MONTH bit 7); 88 * - we should use ALARM_A not ALARM_B (may be wrong on some boards) 89 */ 90 struct rs5c372 { 91 struct i2c_client *client; 92 struct rtc_device *rtc; 93 enum rtc_type type; 94 unsigned time24:1; 95 unsigned has_irq:1; 96 unsigned smbus:1; 97 char buf[17]; 98 char *regs; 99 }; 100 101 static int rs5c_get_regs(struct rs5c372 *rs5c) 102 { 103 struct i2c_client *client = rs5c->client; 104 struct i2c_msg msgs[] = { 105 { client->addr, I2C_M_RD, sizeof rs5c->buf, rs5c->buf }, 106 }; 107 108 /* This implements the third reading method from the datasheet, using 109 * an internal address that's reset after each transaction (by STOP) 110 * to 0x0f ... so we read extra registers, and skip the first one. 111 * 112 * The first method doesn't work with the iop3xx adapter driver, on at 113 * least 80219 chips; this works around that bug. 114 * 115 * The third method on the other hand doesn't work for the SMBus-only 116 * configurations, so we use the the first method there, stripping off 117 * the extra register in the process. 118 */ 119 if (rs5c->smbus) { 120 int addr = RS5C_ADDR(RS5C372_REG_SECS); 121 int size = sizeof(rs5c->buf) - 1; 122 123 if (i2c_smbus_read_i2c_block_data(client, addr, size, 124 rs5c->buf + 1) != size) { 125 dev_warn(&client->dev, "can't read registers\n"); 126 return -EIO; 127 } 128 } else { 129 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { 130 dev_warn(&client->dev, "can't read registers\n"); 131 return -EIO; 132 } 133 } 134 135 dev_dbg(&client->dev, 136 "%02x %02x %02x (%02x) %02x %02x %02x (%02x), " 137 "%02x %02x %02x, %02x %02x %02x; %02x %02x\n", 138 rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3], 139 rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7], 140 rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11], 141 rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]); 142 143 return 0; 144 } 145 146 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) 147 { 148 unsigned hour; 149 150 if (rs5c->time24) 151 return bcd2bin(reg & 0x3f); 152 153 hour = bcd2bin(reg & 0x1f); 154 if (hour == 12) 155 hour = 0; 156 if (reg & 0x20) 157 hour += 12; 158 return hour; 159 } 160 161 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) 162 { 163 if (rs5c->time24) 164 return bin2bcd(hour); 165 166 if (hour > 12) 167 return 0x20 | bin2bcd(hour - 12); 168 if (hour == 12) 169 return 0x20 | bin2bcd(12); 170 if (hour == 0) 171 return bin2bcd(12); 172 return bin2bcd(hour); 173 } 174 175 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) 176 { 177 struct rs5c372 *rs5c = i2c_get_clientdata(client); 178 int status = rs5c_get_regs(rs5c); 179 180 if (status < 0) 181 return status; 182 183 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); 184 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); 185 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); 186 187 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); 188 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); 189 190 /* tm->tm_mon is zero-based */ 191 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; 192 193 /* year is 1900 + tm->tm_year */ 194 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; 195 196 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 197 "mday=%d, mon=%d, year=%d, wday=%d\n", 198 __func__, 199 tm->tm_sec, tm->tm_min, tm->tm_hour, 200 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 201 202 /* rtc might need initialization */ 203 return rtc_valid_tm(tm); 204 } 205 206 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) 207 { 208 struct rs5c372 *rs5c = i2c_get_clientdata(client); 209 unsigned char buf[8]; 210 int addr; 211 212 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " 213 "mday=%d, mon=%d, year=%d, wday=%d\n", 214 __func__, 215 tm->tm_sec, tm->tm_min, tm->tm_hour, 216 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 217 218 addr = RS5C_ADDR(RS5C372_REG_SECS); 219 buf[0] = bin2bcd(tm->tm_sec); 220 buf[1] = bin2bcd(tm->tm_min); 221 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); 222 buf[3] = bin2bcd(tm->tm_wday); 223 buf[4] = bin2bcd(tm->tm_mday); 224 buf[5] = bin2bcd(tm->tm_mon + 1); 225 buf[6] = bin2bcd(tm->tm_year - 100); 226 227 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { 228 dev_err(&client->dev, "%s: write error\n", __func__); 229 return -EIO; 230 } 231 232 return 0; 233 } 234 235 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 236 #define NEED_TRIM 237 #endif 238 239 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 240 #define NEED_TRIM 241 #endif 242 243 #ifdef NEED_TRIM 244 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) 245 { 246 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 247 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; 248 249 if (osc) 250 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; 251 252 if (trim) { 253 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); 254 tmp &= RS5C372_TRIM_MASK; 255 if (tmp & 0x3e) { 256 int t = tmp & 0x3f; 257 258 if (tmp & 0x40) 259 t = (~t | (s8)0xc0) + 1; 260 else 261 t = t - 1; 262 263 tmp = t * 2; 264 } else 265 tmp = 0; 266 *trim = tmp; 267 } 268 269 return 0; 270 } 271 #endif 272 273 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) 274 { 275 return rs5c372_get_datetime(to_i2c_client(dev), tm); 276 } 277 278 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) 279 { 280 return rs5c372_set_datetime(to_i2c_client(dev), tm); 281 } 282 283 #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) 284 285 static int 286 rs5c_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 287 { 288 struct i2c_client *client = to_i2c_client(dev); 289 struct rs5c372 *rs5c = i2c_get_clientdata(client); 290 unsigned char buf; 291 int status, addr; 292 293 buf = rs5c->regs[RS5C_REG_CTRL1]; 294 switch (cmd) { 295 case RTC_UIE_OFF: 296 case RTC_UIE_ON: 297 /* some 327a modes use a different IRQ pin for 1Hz irqs */ 298 if (rs5c->type == rtc_rs5c372a 299 && (buf & RS5C372A_CTRL1_SL1)) 300 return -ENOIOCTLCMD; 301 case RTC_AIE_OFF: 302 case RTC_AIE_ON: 303 /* these irq management calls only make sense for chips 304 * which are wired up to an IRQ. 305 */ 306 if (!rs5c->has_irq) 307 return -ENOIOCTLCMD; 308 break; 309 default: 310 return -ENOIOCTLCMD; 311 } 312 313 status = rs5c_get_regs(rs5c); 314 if (status < 0) 315 return status; 316 317 addr = RS5C_ADDR(RS5C_REG_CTRL1); 318 switch (cmd) { 319 case RTC_AIE_OFF: /* alarm off */ 320 buf &= ~RS5C_CTRL1_AALE; 321 break; 322 case RTC_AIE_ON: /* alarm on */ 323 buf |= RS5C_CTRL1_AALE; 324 break; 325 case RTC_UIE_OFF: /* update off */ 326 buf &= ~RS5C_CTRL1_CT_MASK; 327 break; 328 case RTC_UIE_ON: /* update on */ 329 buf &= ~RS5C_CTRL1_CT_MASK; 330 buf |= RS5C_CTRL1_CT4; 331 break; 332 } 333 334 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { 335 printk(KERN_WARNING "%s: can't update alarm\n", 336 rs5c->rtc->name); 337 status = -EIO; 338 } else 339 rs5c->regs[RS5C_REG_CTRL1] = buf; 340 341 return status; 342 } 343 344 #else 345 #define rs5c_rtc_ioctl NULL 346 #endif 347 348 349 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, 350 * which only exposes a polled programming interface; and since 351 * these calls map directly to those EFI requests; we don't demand 352 * we have an IRQ for this chip when we go through this API. 353 * 354 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs 355 * though, managed through RTC_AIE_{ON,OFF} requests. 356 */ 357 358 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) 359 { 360 struct i2c_client *client = to_i2c_client(dev); 361 struct rs5c372 *rs5c = i2c_get_clientdata(client); 362 int status; 363 364 status = rs5c_get_regs(rs5c); 365 if (status < 0) 366 return status; 367 368 /* report alarm time */ 369 t->time.tm_sec = 0; 370 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); 371 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); 372 t->time.tm_mday = -1; 373 t->time.tm_mon = -1; 374 t->time.tm_year = -1; 375 t->time.tm_wday = -1; 376 t->time.tm_yday = -1; 377 t->time.tm_isdst = -1; 378 379 /* ... and status */ 380 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); 381 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); 382 383 return 0; 384 } 385 386 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) 387 { 388 struct i2c_client *client = to_i2c_client(dev); 389 struct rs5c372 *rs5c = i2c_get_clientdata(client); 390 int status, addr, i; 391 unsigned char buf[3]; 392 393 /* only handle up to 24 hours in the future, like RTC_ALM_SET */ 394 if (t->time.tm_mday != -1 395 || t->time.tm_mon != -1 396 || t->time.tm_year != -1) 397 return -EINVAL; 398 399 /* REVISIT: round up tm_sec */ 400 401 /* if needed, disable irq (clears pending status) */ 402 status = rs5c_get_regs(rs5c); 403 if (status < 0) 404 return status; 405 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { 406 addr = RS5C_ADDR(RS5C_REG_CTRL1); 407 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; 408 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { 409 pr_debug("%s: can't disable alarm\n", rs5c->rtc->name); 410 return -EIO; 411 } 412 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 413 } 414 415 /* set alarm */ 416 buf[0] = bin2bcd(t->time.tm_min); 417 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); 418 buf[2] = 0x7f; /* any/all days */ 419 420 for (i = 0; i < sizeof(buf); i++) { 421 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); 422 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { 423 pr_debug("%s: can't set alarm time\n", rs5c->rtc->name); 424 return -EIO; 425 } 426 } 427 428 /* ... and maybe enable its irq */ 429 if (t->enabled) { 430 addr = RS5C_ADDR(RS5C_REG_CTRL1); 431 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; 432 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) 433 printk(KERN_WARNING "%s: can't enable alarm\n", 434 rs5c->rtc->name); 435 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 436 } 437 438 return 0; 439 } 440 441 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 442 443 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) 444 { 445 int err, osc, trim; 446 447 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); 448 if (err == 0) { 449 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", 450 osc / 1000, osc % 1000); 451 seq_printf(seq, "trim\t\t: %d\n", trim); 452 } 453 454 return 0; 455 } 456 457 #else 458 #define rs5c372_rtc_proc NULL 459 #endif 460 461 static const struct rtc_class_ops rs5c372_rtc_ops = { 462 .proc = rs5c372_rtc_proc, 463 .ioctl = rs5c_rtc_ioctl, 464 .read_time = rs5c372_rtc_read_time, 465 .set_time = rs5c372_rtc_set_time, 466 .read_alarm = rs5c_read_alarm, 467 .set_alarm = rs5c_set_alarm, 468 }; 469 470 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 471 472 static ssize_t rs5c372_sysfs_show_trim(struct device *dev, 473 struct device_attribute *attr, char *buf) 474 { 475 int err, trim; 476 477 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); 478 if (err) 479 return err; 480 481 return sprintf(buf, "%d\n", trim); 482 } 483 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); 484 485 static ssize_t rs5c372_sysfs_show_osc(struct device *dev, 486 struct device_attribute *attr, char *buf) 487 { 488 int err, osc; 489 490 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); 491 if (err) 492 return err; 493 494 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); 495 } 496 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); 497 498 static int rs5c_sysfs_register(struct device *dev) 499 { 500 int err; 501 502 err = device_create_file(dev, &dev_attr_trim); 503 if (err) 504 return err; 505 err = device_create_file(dev, &dev_attr_osc); 506 if (err) 507 device_remove_file(dev, &dev_attr_trim); 508 509 return err; 510 } 511 512 static void rs5c_sysfs_unregister(struct device *dev) 513 { 514 device_remove_file(dev, &dev_attr_trim); 515 device_remove_file(dev, &dev_attr_osc); 516 } 517 518 #else 519 static int rs5c_sysfs_register(struct device *dev) 520 { 521 return 0; 522 } 523 524 static void rs5c_sysfs_unregister(struct device *dev) 525 { 526 /* nothing */ 527 } 528 #endif /* SYSFS */ 529 530 static struct i2c_driver rs5c372_driver; 531 532 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) 533 { 534 unsigned char buf[2]; 535 int addr, i, ret = 0; 536 537 if (rs5c372->type == rtc_r2025sd) { 538 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)) 539 return ret; 540 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST; 541 } else { 542 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) 543 return ret; 544 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; 545 } 546 547 addr = RS5C_ADDR(RS5C_REG_CTRL1); 548 buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; 549 buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; 550 551 /* use 24hr mode */ 552 switch (rs5c372->type) { 553 case rtc_rs5c372a: 554 case rtc_rs5c372b: 555 buf[1] |= RS5C372_CTRL2_24; 556 rs5c372->time24 = 1; 557 break; 558 case rtc_r2025sd: 559 case rtc_rv5c386: 560 case rtc_rv5c387a: 561 buf[0] |= RV5C387_CTRL1_24; 562 rs5c372->time24 = 1; 563 break; 564 default: 565 /* impossible */ 566 break; 567 } 568 569 for (i = 0; i < sizeof(buf); i++) { 570 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); 571 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); 572 if (unlikely(ret < 0)) 573 return ret; 574 } 575 576 rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; 577 rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; 578 579 return 0; 580 } 581 582 static int rs5c372_probe(struct i2c_client *client, 583 const struct i2c_device_id *id) 584 { 585 int err = 0; 586 int smbus_mode = 0; 587 struct rs5c372 *rs5c372; 588 struct rtc_time tm; 589 590 dev_dbg(&client->dev, "%s\n", __func__); 591 592 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 593 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { 594 /* 595 * If we don't have any master mode adapter, try breaking 596 * it down in to the barest of capabilities. 597 */ 598 if (i2c_check_functionality(client->adapter, 599 I2C_FUNC_SMBUS_BYTE_DATA | 600 I2C_FUNC_SMBUS_I2C_BLOCK)) 601 smbus_mode = 1; 602 else { 603 /* Still no good, give up */ 604 err = -ENODEV; 605 goto exit; 606 } 607 } 608 609 if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) { 610 err = -ENOMEM; 611 goto exit; 612 } 613 614 rs5c372->client = client; 615 i2c_set_clientdata(client, rs5c372); 616 rs5c372->type = id->driver_data; 617 618 /* we read registers 0x0f then 0x00-0x0f; skip the first one */ 619 rs5c372->regs = &rs5c372->buf[1]; 620 rs5c372->smbus = smbus_mode; 621 622 err = rs5c_get_regs(rs5c372); 623 if (err < 0) 624 goto exit_kfree; 625 626 /* clock may be set for am/pm or 24 hr time */ 627 switch (rs5c372->type) { 628 case rtc_rs5c372a: 629 case rtc_rs5c372b: 630 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. 631 * so does periodic irq, except some 327a modes. 632 */ 633 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) 634 rs5c372->time24 = 1; 635 break; 636 case rtc_r2025sd: 637 case rtc_rv5c386: 638 case rtc_rv5c387a: 639 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) 640 rs5c372->time24 = 1; 641 /* alarm uses ALARM_W; and nINTRB for alarm and periodic 642 * irq, on both 386 and 387 643 */ 644 break; 645 default: 646 dev_err(&client->dev, "unknown RTC type\n"); 647 goto exit_kfree; 648 } 649 650 /* if the oscillator lost power and no other software (like 651 * the bootloader) set it up, do it here. 652 * 653 * The R2025S/D does this a little differently than the other 654 * parts, so we special case that.. 655 */ 656 err = rs5c_oscillator_setup(rs5c372); 657 if (unlikely(err < 0)) { 658 dev_err(&client->dev, "setup error\n"); 659 goto exit_kfree; 660 } 661 662 if (rs5c372_get_datetime(client, &tm) < 0) 663 dev_warn(&client->dev, "clock needs to be set\n"); 664 665 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n", 666 ({ char *s; switch (rs5c372->type) { 667 case rtc_r2025sd: s = "r2025sd"; break; 668 case rtc_rs5c372a: s = "rs5c372a"; break; 669 case rtc_rs5c372b: s = "rs5c372b"; break; 670 case rtc_rv5c386: s = "rv5c386"; break; 671 case rtc_rv5c387a: s = "rv5c387a"; break; 672 default: s = "chip"; break; 673 }; s;}), 674 rs5c372->time24 ? "24hr" : "am/pm" 675 ); 676 677 /* REVISIT use client->irq to register alarm irq ... */ 678 679 rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name, 680 &client->dev, &rs5c372_rtc_ops, THIS_MODULE); 681 682 if (IS_ERR(rs5c372->rtc)) { 683 err = PTR_ERR(rs5c372->rtc); 684 goto exit_kfree; 685 } 686 687 err = rs5c_sysfs_register(&client->dev); 688 if (err) 689 goto exit_devreg; 690 691 return 0; 692 693 exit_devreg: 694 rtc_device_unregister(rs5c372->rtc); 695 696 exit_kfree: 697 kfree(rs5c372); 698 699 exit: 700 return err; 701 } 702 703 static int rs5c372_remove(struct i2c_client *client) 704 { 705 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 706 707 rtc_device_unregister(rs5c372->rtc); 708 rs5c_sysfs_unregister(&client->dev); 709 kfree(rs5c372); 710 return 0; 711 } 712 713 static struct i2c_driver rs5c372_driver = { 714 .driver = { 715 .name = "rtc-rs5c372", 716 }, 717 .probe = rs5c372_probe, 718 .remove = rs5c372_remove, 719 .id_table = rs5c372_id, 720 }; 721 722 static __init int rs5c372_init(void) 723 { 724 return i2c_add_driver(&rs5c372_driver); 725 } 726 727 static __exit void rs5c372_exit(void) 728 { 729 i2c_del_driver(&rs5c372_driver); 730 } 731 732 module_init(rs5c372_init); 733 module_exit(rs5c372_exit); 734 735 MODULE_AUTHOR( 736 "Pavel Mironchik <pmironchik@optifacio.net>, " 737 "Alessandro Zummo <a.zummo@towertech.it>, " 738 "Paul Mundt <lethal@linux-sh.org>"); 739 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); 740 MODULE_LICENSE("GPL"); 741 MODULE_VERSION(DRV_VERSION); 742