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 dev_warn(dev, "can't update alarm\n"); 315 status = -EIO; 316 } else 317 rs5c->regs[RS5C_REG_CTRL1] = buf; 318 319 return status; 320 } 321 322 323 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, 324 * which only exposes a polled programming interface; and since 325 * these calls map directly to those EFI requests; we don't demand 326 * we have an IRQ for this chip when we go through this API. 327 * 328 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs 329 * though, managed through RTC_AIE_{ON,OFF} requests. 330 */ 331 332 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) 333 { 334 struct i2c_client *client = to_i2c_client(dev); 335 struct rs5c372 *rs5c = i2c_get_clientdata(client); 336 int status; 337 338 status = rs5c_get_regs(rs5c); 339 if (status < 0) 340 return status; 341 342 /* report alarm time */ 343 t->time.tm_sec = 0; 344 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); 345 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); 346 t->time.tm_mday = -1; 347 t->time.tm_mon = -1; 348 t->time.tm_year = -1; 349 t->time.tm_wday = -1; 350 t->time.tm_yday = -1; 351 t->time.tm_isdst = -1; 352 353 /* ... and status */ 354 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); 355 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); 356 357 return 0; 358 } 359 360 static int rs5c_set_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, addr, i; 365 unsigned char buf[3]; 366 367 /* only handle up to 24 hours in the future, like RTC_ALM_SET */ 368 if (t->time.tm_mday != -1 369 || t->time.tm_mon != -1 370 || t->time.tm_year != -1) 371 return -EINVAL; 372 373 /* REVISIT: round up tm_sec */ 374 375 /* if needed, disable irq (clears pending status) */ 376 status = rs5c_get_regs(rs5c); 377 if (status < 0) 378 return status; 379 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { 380 addr = RS5C_ADDR(RS5C_REG_CTRL1); 381 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; 382 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { 383 dev_dbg(dev, "can't disable alarm\n"); 384 return -EIO; 385 } 386 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 387 } 388 389 /* set alarm */ 390 buf[0] = bin2bcd(t->time.tm_min); 391 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); 392 buf[2] = 0x7f; /* any/all days */ 393 394 for (i = 0; i < sizeof(buf); i++) { 395 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); 396 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { 397 dev_dbg(dev, "can't set alarm time\n"); 398 return -EIO; 399 } 400 } 401 402 /* ... and maybe enable its irq */ 403 if (t->enabled) { 404 addr = RS5C_ADDR(RS5C_REG_CTRL1); 405 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; 406 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) 407 dev_warn(dev, "can't enable alarm\n"); 408 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 409 } 410 411 return 0; 412 } 413 414 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 415 416 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) 417 { 418 int err, osc, trim; 419 420 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); 421 if (err == 0) { 422 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", 423 osc / 1000, osc % 1000); 424 seq_printf(seq, "trim\t\t: %d\n", trim); 425 } 426 427 return 0; 428 } 429 430 #else 431 #define rs5c372_rtc_proc NULL 432 #endif 433 434 static const struct rtc_class_ops rs5c372_rtc_ops = { 435 .proc = rs5c372_rtc_proc, 436 .read_time = rs5c372_rtc_read_time, 437 .set_time = rs5c372_rtc_set_time, 438 .read_alarm = rs5c_read_alarm, 439 .set_alarm = rs5c_set_alarm, 440 .alarm_irq_enable = rs5c_rtc_alarm_irq_enable, 441 }; 442 443 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 444 445 static ssize_t rs5c372_sysfs_show_trim(struct device *dev, 446 struct device_attribute *attr, char *buf) 447 { 448 int err, trim; 449 450 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); 451 if (err) 452 return err; 453 454 return sprintf(buf, "%d\n", trim); 455 } 456 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); 457 458 static ssize_t rs5c372_sysfs_show_osc(struct device *dev, 459 struct device_attribute *attr, char *buf) 460 { 461 int err, osc; 462 463 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); 464 if (err) 465 return err; 466 467 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); 468 } 469 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); 470 471 static int rs5c_sysfs_register(struct device *dev) 472 { 473 int err; 474 475 err = device_create_file(dev, &dev_attr_trim); 476 if (err) 477 return err; 478 err = device_create_file(dev, &dev_attr_osc); 479 if (err) 480 device_remove_file(dev, &dev_attr_trim); 481 482 return err; 483 } 484 485 static void rs5c_sysfs_unregister(struct device *dev) 486 { 487 device_remove_file(dev, &dev_attr_trim); 488 device_remove_file(dev, &dev_attr_osc); 489 } 490 491 #else 492 static int rs5c_sysfs_register(struct device *dev) 493 { 494 return 0; 495 } 496 497 static void rs5c_sysfs_unregister(struct device *dev) 498 { 499 /* nothing */ 500 } 501 #endif /* SYSFS */ 502 503 static struct i2c_driver rs5c372_driver; 504 505 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) 506 { 507 unsigned char buf[2]; 508 int addr, i, ret = 0; 509 510 if (rs5c372->type == rtc_r2025sd) { 511 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)) 512 return ret; 513 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST; 514 } else { 515 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) 516 return ret; 517 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; 518 } 519 520 addr = RS5C_ADDR(RS5C_REG_CTRL1); 521 buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; 522 buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; 523 524 /* use 24hr mode */ 525 switch (rs5c372->type) { 526 case rtc_rs5c372a: 527 case rtc_rs5c372b: 528 buf[1] |= RS5C372_CTRL2_24; 529 rs5c372->time24 = 1; 530 break; 531 case rtc_r2025sd: 532 case rtc_rv5c386: 533 case rtc_rv5c387a: 534 buf[0] |= RV5C387_CTRL1_24; 535 rs5c372->time24 = 1; 536 break; 537 default: 538 /* impossible */ 539 break; 540 } 541 542 for (i = 0; i < sizeof(buf); i++) { 543 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); 544 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); 545 if (unlikely(ret < 0)) 546 return ret; 547 } 548 549 rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; 550 rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; 551 552 return 0; 553 } 554 555 static int rs5c372_probe(struct i2c_client *client, 556 const struct i2c_device_id *id) 557 { 558 int err = 0; 559 int smbus_mode = 0; 560 struct rs5c372 *rs5c372; 561 struct rtc_time tm; 562 563 dev_dbg(&client->dev, "%s\n", __func__); 564 565 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 566 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { 567 /* 568 * If we don't have any master mode adapter, try breaking 569 * it down in to the barest of capabilities. 570 */ 571 if (i2c_check_functionality(client->adapter, 572 I2C_FUNC_SMBUS_BYTE_DATA | 573 I2C_FUNC_SMBUS_I2C_BLOCK)) 574 smbus_mode = 1; 575 else { 576 /* Still no good, give up */ 577 err = -ENODEV; 578 goto exit; 579 } 580 } 581 582 if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) { 583 err = -ENOMEM; 584 goto exit; 585 } 586 587 rs5c372->client = client; 588 i2c_set_clientdata(client, rs5c372); 589 rs5c372->type = id->driver_data; 590 591 /* we read registers 0x0f then 0x00-0x0f; skip the first one */ 592 rs5c372->regs = &rs5c372->buf[1]; 593 rs5c372->smbus = smbus_mode; 594 595 err = rs5c_get_regs(rs5c372); 596 if (err < 0) 597 goto exit_kfree; 598 599 /* clock may be set for am/pm or 24 hr time */ 600 switch (rs5c372->type) { 601 case rtc_rs5c372a: 602 case rtc_rs5c372b: 603 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. 604 * so does periodic irq, except some 327a modes. 605 */ 606 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) 607 rs5c372->time24 = 1; 608 break; 609 case rtc_r2025sd: 610 case rtc_rv5c386: 611 case rtc_rv5c387a: 612 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) 613 rs5c372->time24 = 1; 614 /* alarm uses ALARM_W; and nINTRB for alarm and periodic 615 * irq, on both 386 and 387 616 */ 617 break; 618 default: 619 dev_err(&client->dev, "unknown RTC type\n"); 620 goto exit_kfree; 621 } 622 623 /* if the oscillator lost power and no other software (like 624 * the bootloader) set it up, do it here. 625 * 626 * The R2025S/D does this a little differently than the other 627 * parts, so we special case that.. 628 */ 629 err = rs5c_oscillator_setup(rs5c372); 630 if (unlikely(err < 0)) { 631 dev_err(&client->dev, "setup error\n"); 632 goto exit_kfree; 633 } 634 635 if (rs5c372_get_datetime(client, &tm) < 0) 636 dev_warn(&client->dev, "clock needs to be set\n"); 637 638 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n", 639 ({ char *s; switch (rs5c372->type) { 640 case rtc_r2025sd: s = "r2025sd"; break; 641 case rtc_rs5c372a: s = "rs5c372a"; break; 642 case rtc_rs5c372b: s = "rs5c372b"; break; 643 case rtc_rv5c386: s = "rv5c386"; break; 644 case rtc_rv5c387a: s = "rv5c387a"; break; 645 default: s = "chip"; break; 646 }; s;}), 647 rs5c372->time24 ? "24hr" : "am/pm" 648 ); 649 650 /* REVISIT use client->irq to register alarm irq ... */ 651 652 rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name, 653 &client->dev, &rs5c372_rtc_ops, THIS_MODULE); 654 655 if (IS_ERR(rs5c372->rtc)) { 656 err = PTR_ERR(rs5c372->rtc); 657 goto exit_kfree; 658 } 659 660 err = rs5c_sysfs_register(&client->dev); 661 if (err) 662 goto exit_devreg; 663 664 return 0; 665 666 exit_devreg: 667 rtc_device_unregister(rs5c372->rtc); 668 669 exit_kfree: 670 kfree(rs5c372); 671 672 exit: 673 return err; 674 } 675 676 static int rs5c372_remove(struct i2c_client *client) 677 { 678 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 679 680 rtc_device_unregister(rs5c372->rtc); 681 rs5c_sysfs_unregister(&client->dev); 682 kfree(rs5c372); 683 return 0; 684 } 685 686 static struct i2c_driver rs5c372_driver = { 687 .driver = { 688 .name = "rtc-rs5c372", 689 }, 690 .probe = rs5c372_probe, 691 .remove = rs5c372_remove, 692 .id_table = rs5c372_id, 693 }; 694 695 module_i2c_driver(rs5c372_driver); 696 697 MODULE_AUTHOR( 698 "Pavel Mironchik <pmironchik@optifacio.net>, " 699 "Alessandro Zummo <a.zummo@towertech.it>, " 700 "Paul Mundt <lethal@linux-sh.org>"); 701 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); 702 MODULE_LICENSE("GPL"); 703 MODULE_VERSION(DRV_VERSION); 704