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_rs5c372a, 72 rtc_rs5c372b, 73 rtc_rv5c386, 74 rtc_rv5c387a, 75 }; 76 77 static const struct i2c_device_id rs5c372_id[] = { 78 { "r2025sd", rtc_r2025sd }, 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 /* REVISIT: this assumes that: 88 * - we're in the 21st century, so it's safe to ignore the century 89 * bit for rv5c38[67] (REG_MONTH bit 7); 90 * - we should use ALARM_A not ALARM_B (may be wrong on some boards) 91 */ 92 struct rs5c372 { 93 struct i2c_client *client; 94 struct rtc_device *rtc; 95 enum rtc_type type; 96 unsigned time24:1; 97 unsigned has_irq:1; 98 unsigned smbus:1; 99 char buf[17]; 100 char *regs; 101 }; 102 103 static int rs5c_get_regs(struct rs5c372 *rs5c) 104 { 105 struct i2c_client *client = rs5c->client; 106 struct i2c_msg msgs[] = { 107 { 108 .addr = client->addr, 109 .flags = I2C_M_RD, 110 .len = sizeof(rs5c->buf), 111 .buf = rs5c->buf 112 }, 113 }; 114 115 /* This implements the third reading method from the datasheet, using 116 * an internal address that's reset after each transaction (by STOP) 117 * to 0x0f ... so we read extra registers, and skip the first one. 118 * 119 * The first method doesn't work with the iop3xx adapter driver, on at 120 * least 80219 chips; this works around that bug. 121 * 122 * The third method on the other hand doesn't work for the SMBus-only 123 * configurations, so we use the the first method there, stripping off 124 * the extra register in the process. 125 */ 126 if (rs5c->smbus) { 127 int addr = RS5C_ADDR(RS5C372_REG_SECS); 128 int size = sizeof(rs5c->buf) - 1; 129 130 if (i2c_smbus_read_i2c_block_data(client, addr, size, 131 rs5c->buf + 1) != size) { 132 dev_warn(&client->dev, "can't read registers\n"); 133 return -EIO; 134 } 135 } else { 136 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { 137 dev_warn(&client->dev, "can't read registers\n"); 138 return -EIO; 139 } 140 } 141 142 dev_dbg(&client->dev, 143 "%02x %02x %02x (%02x) %02x %02x %02x (%02x), " 144 "%02x %02x %02x, %02x %02x %02x; %02x %02x\n", 145 rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3], 146 rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7], 147 rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11], 148 rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]); 149 150 return 0; 151 } 152 153 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) 154 { 155 unsigned hour; 156 157 if (rs5c->time24) 158 return bcd2bin(reg & 0x3f); 159 160 hour = bcd2bin(reg & 0x1f); 161 if (hour == 12) 162 hour = 0; 163 if (reg & 0x20) 164 hour += 12; 165 return hour; 166 } 167 168 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) 169 { 170 if (rs5c->time24) 171 return bin2bcd(hour); 172 173 if (hour > 12) 174 return 0x20 | bin2bcd(hour - 12); 175 if (hour == 12) 176 return 0x20 | bin2bcd(12); 177 if (hour == 0) 178 return bin2bcd(12); 179 return bin2bcd(hour); 180 } 181 182 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) 183 { 184 struct rs5c372 *rs5c = i2c_get_clientdata(client); 185 int status = rs5c_get_regs(rs5c); 186 187 if (status < 0) 188 return status; 189 190 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); 191 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); 192 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); 193 194 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); 195 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); 196 197 /* tm->tm_mon is zero-based */ 198 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; 199 200 /* year is 1900 + tm->tm_year */ 201 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; 202 203 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 204 "mday=%d, mon=%d, year=%d, wday=%d\n", 205 __func__, 206 tm->tm_sec, tm->tm_min, tm->tm_hour, 207 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 208 209 /* rtc might need initialization */ 210 return rtc_valid_tm(tm); 211 } 212 213 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) 214 { 215 struct rs5c372 *rs5c = i2c_get_clientdata(client); 216 unsigned char buf[7]; 217 int addr; 218 219 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " 220 "mday=%d, mon=%d, year=%d, wday=%d\n", 221 __func__, 222 tm->tm_sec, tm->tm_min, tm->tm_hour, 223 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 224 225 addr = RS5C_ADDR(RS5C372_REG_SECS); 226 buf[0] = bin2bcd(tm->tm_sec); 227 buf[1] = bin2bcd(tm->tm_min); 228 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); 229 buf[3] = bin2bcd(tm->tm_wday); 230 buf[4] = bin2bcd(tm->tm_mday); 231 buf[5] = bin2bcd(tm->tm_mon + 1); 232 buf[6] = bin2bcd(tm->tm_year - 100); 233 234 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { 235 dev_err(&client->dev, "%s: write error\n", __func__); 236 return -EIO; 237 } 238 239 return 0; 240 } 241 242 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 243 #define NEED_TRIM 244 #endif 245 246 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 247 #define NEED_TRIM 248 #endif 249 250 #ifdef NEED_TRIM 251 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) 252 { 253 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 254 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; 255 256 if (osc) 257 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; 258 259 if (trim) { 260 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); 261 tmp &= RS5C372_TRIM_MASK; 262 if (tmp & 0x3e) { 263 int t = tmp & 0x3f; 264 265 if (tmp & 0x40) 266 t = (~t | (s8)0xc0) + 1; 267 else 268 t = t - 1; 269 270 tmp = t * 2; 271 } else 272 tmp = 0; 273 *trim = tmp; 274 } 275 276 return 0; 277 } 278 #endif 279 280 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) 281 { 282 return rs5c372_get_datetime(to_i2c_client(dev), tm); 283 } 284 285 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) 286 { 287 return rs5c372_set_datetime(to_i2c_client(dev), tm); 288 } 289 290 291 static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 292 { 293 struct i2c_client *client = to_i2c_client(dev); 294 struct rs5c372 *rs5c = i2c_get_clientdata(client); 295 unsigned char buf; 296 int status, addr; 297 298 buf = rs5c->regs[RS5C_REG_CTRL1]; 299 300 if (!rs5c->has_irq) 301 return -EINVAL; 302 303 status = rs5c_get_regs(rs5c); 304 if (status < 0) 305 return status; 306 307 addr = RS5C_ADDR(RS5C_REG_CTRL1); 308 if (enabled) 309 buf |= RS5C_CTRL1_AALE; 310 else 311 buf &= ~RS5C_CTRL1_AALE; 312 313 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { 314 printk(KERN_WARNING "%s: can't update alarm\n", 315 rs5c->rtc->name); 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 pr_debug("%s: can't disable alarm\n", rs5c->rtc->name); 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 pr_debug("%s: can't set alarm time\n", rs5c->rtc->name); 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 printk(KERN_WARNING "%s: can't enable alarm\n", 409 rs5c->rtc->name); 410 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 411 } 412 413 return 0; 414 } 415 416 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 417 418 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) 419 { 420 int err, osc, trim; 421 422 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); 423 if (err == 0) { 424 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", 425 osc / 1000, osc % 1000); 426 seq_printf(seq, "trim\t\t: %d\n", trim); 427 } 428 429 return 0; 430 } 431 432 #else 433 #define rs5c372_rtc_proc NULL 434 #endif 435 436 static const struct rtc_class_ops rs5c372_rtc_ops = { 437 .proc = rs5c372_rtc_proc, 438 .read_time = rs5c372_rtc_read_time, 439 .set_time = rs5c372_rtc_set_time, 440 .read_alarm = rs5c_read_alarm, 441 .set_alarm = rs5c_set_alarm, 442 .alarm_irq_enable = rs5c_rtc_alarm_irq_enable, 443 }; 444 445 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 446 447 static ssize_t rs5c372_sysfs_show_trim(struct device *dev, 448 struct device_attribute *attr, char *buf) 449 { 450 int err, trim; 451 452 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); 453 if (err) 454 return err; 455 456 return sprintf(buf, "%d\n", trim); 457 } 458 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); 459 460 static ssize_t rs5c372_sysfs_show_osc(struct device *dev, 461 struct device_attribute *attr, char *buf) 462 { 463 int err, osc; 464 465 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); 466 if (err) 467 return err; 468 469 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); 470 } 471 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); 472 473 static int rs5c_sysfs_register(struct device *dev) 474 { 475 int err; 476 477 err = device_create_file(dev, &dev_attr_trim); 478 if (err) 479 return err; 480 err = device_create_file(dev, &dev_attr_osc); 481 if (err) 482 device_remove_file(dev, &dev_attr_trim); 483 484 return err; 485 } 486 487 static void rs5c_sysfs_unregister(struct device *dev) 488 { 489 device_remove_file(dev, &dev_attr_trim); 490 device_remove_file(dev, &dev_attr_osc); 491 } 492 493 #else 494 static int rs5c_sysfs_register(struct device *dev) 495 { 496 return 0; 497 } 498 499 static void rs5c_sysfs_unregister(struct device *dev) 500 { 501 /* nothing */ 502 } 503 #endif /* SYSFS */ 504 505 static struct i2c_driver rs5c372_driver; 506 507 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) 508 { 509 unsigned char buf[2]; 510 int addr, i, ret = 0; 511 512 if (rs5c372->type == rtc_r2025sd) { 513 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)) 514 return ret; 515 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST; 516 } else { 517 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) 518 return ret; 519 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; 520 } 521 522 addr = RS5C_ADDR(RS5C_REG_CTRL1); 523 buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; 524 buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; 525 526 /* use 24hr mode */ 527 switch (rs5c372->type) { 528 case rtc_rs5c372a: 529 case rtc_rs5c372b: 530 buf[1] |= RS5C372_CTRL2_24; 531 rs5c372->time24 = 1; 532 break; 533 case rtc_r2025sd: 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 if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) { 585 err = -ENOMEM; 586 goto exit; 587 } 588 589 rs5c372->client = client; 590 i2c_set_clientdata(client, rs5c372); 591 rs5c372->type = id->driver_data; 592 593 /* we read registers 0x0f then 0x00-0x0f; skip the first one */ 594 rs5c372->regs = &rs5c372->buf[1]; 595 rs5c372->smbus = smbus_mode; 596 597 err = rs5c_get_regs(rs5c372); 598 if (err < 0) 599 goto exit_kfree; 600 601 /* clock may be set for am/pm or 24 hr time */ 602 switch (rs5c372->type) { 603 case rtc_rs5c372a: 604 case rtc_rs5c372b: 605 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. 606 * so does periodic irq, except some 327a modes. 607 */ 608 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) 609 rs5c372->time24 = 1; 610 break; 611 case rtc_r2025sd: 612 case rtc_rv5c386: 613 case rtc_rv5c387a: 614 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) 615 rs5c372->time24 = 1; 616 /* alarm uses ALARM_W; and nINTRB for alarm and periodic 617 * irq, on both 386 and 387 618 */ 619 break; 620 default: 621 dev_err(&client->dev, "unknown RTC type\n"); 622 goto exit_kfree; 623 } 624 625 /* if the oscillator lost power and no other software (like 626 * the bootloader) set it up, do it here. 627 * 628 * The R2025S/D does this a little differently than the other 629 * parts, so we special case that.. 630 */ 631 err = rs5c_oscillator_setup(rs5c372); 632 if (unlikely(err < 0)) { 633 dev_err(&client->dev, "setup error\n"); 634 goto exit_kfree; 635 } 636 637 if (rs5c372_get_datetime(client, &tm) < 0) 638 dev_warn(&client->dev, "clock needs to be set\n"); 639 640 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n", 641 ({ char *s; switch (rs5c372->type) { 642 case rtc_r2025sd: s = "r2025sd"; break; 643 case rtc_rs5c372a: s = "rs5c372a"; break; 644 case rtc_rs5c372b: s = "rs5c372b"; break; 645 case rtc_rv5c386: s = "rv5c386"; break; 646 case rtc_rv5c387a: s = "rv5c387a"; break; 647 default: s = "chip"; break; 648 }; s;}), 649 rs5c372->time24 ? "24hr" : "am/pm" 650 ); 651 652 /* REVISIT use client->irq to register alarm irq ... */ 653 654 rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name, 655 &client->dev, &rs5c372_rtc_ops, THIS_MODULE); 656 657 if (IS_ERR(rs5c372->rtc)) { 658 err = PTR_ERR(rs5c372->rtc); 659 goto exit_kfree; 660 } 661 662 err = rs5c_sysfs_register(&client->dev); 663 if (err) 664 goto exit_devreg; 665 666 return 0; 667 668 exit_devreg: 669 rtc_device_unregister(rs5c372->rtc); 670 671 exit_kfree: 672 kfree(rs5c372); 673 674 exit: 675 return err; 676 } 677 678 static int rs5c372_remove(struct i2c_client *client) 679 { 680 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 681 682 rtc_device_unregister(rs5c372->rtc); 683 rs5c_sysfs_unregister(&client->dev); 684 kfree(rs5c372); 685 return 0; 686 } 687 688 static struct i2c_driver rs5c372_driver = { 689 .driver = { 690 .name = "rtc-rs5c372", 691 }, 692 .probe = rs5c372_probe, 693 .remove = rs5c372_remove, 694 .id_table = rs5c372_id, 695 }; 696 697 module_i2c_driver(rs5c372_driver); 698 699 MODULE_AUTHOR( 700 "Pavel Mironchik <pmironchik@optifacio.net>, " 701 "Alessandro Zummo <a.zummo@towertech.it>, " 702 "Paul Mundt <lethal@linux-sh.org>"); 703 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); 704 MODULE_LICENSE("GPL"); 705 MODULE_VERSION(DRV_VERSION); 706