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