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 "%02x %02x %02x (%02x) %02x %02x %02x (%02x), " 146 "%02x %02x %02x, %02x %02x %02x; %02x %02x\n", 147 rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3], 148 rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7], 149 rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11], 150 rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]); 151 152 return 0; 153 } 154 155 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) 156 { 157 unsigned hour; 158 159 if (rs5c->time24) 160 return bcd2bin(reg & 0x3f); 161 162 hour = bcd2bin(reg & 0x1f); 163 if (hour == 12) 164 hour = 0; 165 if (reg & 0x20) 166 hour += 12; 167 return hour; 168 } 169 170 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) 171 { 172 if (rs5c->time24) 173 return bin2bcd(hour); 174 175 if (hour > 12) 176 return 0x20 | bin2bcd(hour - 12); 177 if (hour == 12) 178 return 0x20 | bin2bcd(12); 179 if (hour == 0) 180 return bin2bcd(12); 181 return bin2bcd(hour); 182 } 183 184 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) 185 { 186 struct rs5c372 *rs5c = i2c_get_clientdata(client); 187 int status = rs5c_get_regs(rs5c); 188 189 if (status < 0) 190 return status; 191 192 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); 193 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); 194 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); 195 196 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); 197 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); 198 199 /* tm->tm_mon is zero-based */ 200 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; 201 202 /* year is 1900 + tm->tm_year */ 203 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; 204 205 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 206 "mday=%d, mon=%d, year=%d, wday=%d\n", 207 __func__, 208 tm->tm_sec, tm->tm_min, tm->tm_hour, 209 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 210 211 /* rtc might need initialization */ 212 return rtc_valid_tm(tm); 213 } 214 215 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) 216 { 217 struct rs5c372 *rs5c = i2c_get_clientdata(client); 218 unsigned char buf[7]; 219 int addr; 220 221 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " 222 "mday=%d, mon=%d, year=%d, wday=%d\n", 223 __func__, 224 tm->tm_sec, tm->tm_min, tm->tm_hour, 225 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); 226 227 addr = RS5C_ADDR(RS5C372_REG_SECS); 228 buf[0] = bin2bcd(tm->tm_sec); 229 buf[1] = bin2bcd(tm->tm_min); 230 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); 231 buf[3] = bin2bcd(tm->tm_wday); 232 buf[4] = bin2bcd(tm->tm_mday); 233 buf[5] = bin2bcd(tm->tm_mon + 1); 234 buf[6] = bin2bcd(tm->tm_year - 100); 235 236 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { 237 dev_err(&client->dev, "%s: write error\n", __func__); 238 return -EIO; 239 } 240 241 return 0; 242 } 243 244 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 245 #define NEED_TRIM 246 #endif 247 248 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 249 #define NEED_TRIM 250 #endif 251 252 #ifdef NEED_TRIM 253 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) 254 { 255 struct rs5c372 *rs5c372 = i2c_get_clientdata(client); 256 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; 257 258 if (osc) 259 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; 260 261 if (trim) { 262 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); 263 tmp &= RS5C372_TRIM_MASK; 264 if (tmp & 0x3e) { 265 int t = tmp & 0x3f; 266 267 if (tmp & 0x40) 268 t = (~t | (s8)0xc0) + 1; 269 else 270 t = t - 1; 271 272 tmp = t * 2; 273 } else 274 tmp = 0; 275 *trim = tmp; 276 } 277 278 return 0; 279 } 280 #endif 281 282 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) 283 { 284 return rs5c372_get_datetime(to_i2c_client(dev), tm); 285 } 286 287 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) 288 { 289 return rs5c372_set_datetime(to_i2c_client(dev), tm); 290 } 291 292 293 static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 294 { 295 struct i2c_client *client = to_i2c_client(dev); 296 struct rs5c372 *rs5c = i2c_get_clientdata(client); 297 unsigned char buf; 298 int status, addr; 299 300 buf = rs5c->regs[RS5C_REG_CTRL1]; 301 302 if (!rs5c->has_irq) 303 return -EINVAL; 304 305 status = rs5c_get_regs(rs5c); 306 if (status < 0) 307 return status; 308 309 addr = RS5C_ADDR(RS5C_REG_CTRL1); 310 if (enabled) 311 buf |= RS5C_CTRL1_AALE; 312 else 313 buf &= ~RS5C_CTRL1_AALE; 314 315 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { 316 dev_warn(dev, "can't update alarm\n"); 317 status = -EIO; 318 } else 319 rs5c->regs[RS5C_REG_CTRL1] = buf; 320 321 return status; 322 } 323 324 325 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, 326 * which only exposes a polled programming interface; and since 327 * these calls map directly to those EFI requests; we don't demand 328 * we have an IRQ for this chip when we go through this API. 329 * 330 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs 331 * though, managed through RTC_AIE_{ON,OFF} requests. 332 */ 333 334 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) 335 { 336 struct i2c_client *client = to_i2c_client(dev); 337 struct rs5c372 *rs5c = i2c_get_clientdata(client); 338 int status; 339 340 status = rs5c_get_regs(rs5c); 341 if (status < 0) 342 return status; 343 344 /* report alarm time */ 345 t->time.tm_sec = 0; 346 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); 347 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); 348 t->time.tm_mday = -1; 349 t->time.tm_mon = -1; 350 t->time.tm_year = -1; 351 t->time.tm_wday = -1; 352 t->time.tm_yday = -1; 353 t->time.tm_isdst = -1; 354 355 /* ... and status */ 356 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); 357 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); 358 359 return 0; 360 } 361 362 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) 363 { 364 struct i2c_client *client = to_i2c_client(dev); 365 struct rs5c372 *rs5c = i2c_get_clientdata(client); 366 int status, addr, i; 367 unsigned char buf[3]; 368 369 /* only handle up to 24 hours in the future, like RTC_ALM_SET */ 370 if (t->time.tm_mday != -1 371 || t->time.tm_mon != -1 372 || t->time.tm_year != -1) 373 return -EINVAL; 374 375 /* REVISIT: round up tm_sec */ 376 377 /* if needed, disable irq (clears pending status) */ 378 status = rs5c_get_regs(rs5c); 379 if (status < 0) 380 return status; 381 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { 382 addr = RS5C_ADDR(RS5C_REG_CTRL1); 383 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; 384 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { 385 dev_dbg(dev, "can't disable alarm\n"); 386 return -EIO; 387 } 388 rs5c->regs[RS5C_REG_CTRL1] = buf[0]; 389 } 390 391 /* set alarm */ 392 buf[0] = bin2bcd(t->time.tm_min); 393 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); 394 buf[2] = 0x7f; /* any/all days */ 395 396 for (i = 0; i < sizeof(buf); i++) { 397 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); 398 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { 399 dev_dbg(dev, "can't set alarm time\n"); 400 return -EIO; 401 } 402 } 403 404 /* ... and maybe enable its irq */ 405 if (t->enabled) { 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 dev_warn(dev, "can't enable alarm\n"); 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_r2221tl: 535 case rtc_rv5c386: 536 case rtc_rv5c387a: 537 buf[0] |= RV5C387_CTRL1_24; 538 rs5c372->time24 = 1; 539 break; 540 default: 541 /* impossible */ 542 break; 543 } 544 545 for (i = 0; i < sizeof(buf); i++) { 546 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); 547 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); 548 if (unlikely(ret < 0)) 549 return ret; 550 } 551 552 rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; 553 rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; 554 555 return 0; 556 } 557 558 static int rs5c372_probe(struct i2c_client *client, 559 const struct i2c_device_id *id) 560 { 561 int err = 0; 562 int smbus_mode = 0; 563 struct rs5c372 *rs5c372; 564 struct rtc_time tm; 565 566 dev_dbg(&client->dev, "%s\n", __func__); 567 568 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | 569 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { 570 /* 571 * If we don't have any master mode adapter, try breaking 572 * it down in to the barest of capabilities. 573 */ 574 if (i2c_check_functionality(client->adapter, 575 I2C_FUNC_SMBUS_BYTE_DATA | 576 I2C_FUNC_SMBUS_I2C_BLOCK)) 577 smbus_mode = 1; 578 else { 579 /* Still no good, give up */ 580 err = -ENODEV; 581 goto exit; 582 } 583 } 584 585 rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372), 586 GFP_KERNEL); 587 if (!rs5c372) { 588 err = -ENOMEM; 589 goto exit; 590 } 591 592 rs5c372->client = client; 593 i2c_set_clientdata(client, rs5c372); 594 rs5c372->type = id->driver_data; 595 596 /* we read registers 0x0f then 0x00-0x0f; skip the first one */ 597 rs5c372->regs = &rs5c372->buf[1]; 598 rs5c372->smbus = smbus_mode; 599 600 err = rs5c_get_regs(rs5c372); 601 if (err < 0) 602 goto exit; 603 604 /* clock may be set for am/pm or 24 hr time */ 605 switch (rs5c372->type) { 606 case rtc_rs5c372a: 607 case rtc_rs5c372b: 608 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. 609 * so does periodic irq, except some 327a modes. 610 */ 611 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) 612 rs5c372->time24 = 1; 613 break; 614 case rtc_r2025sd: 615 case rtc_r2221tl: 616 case rtc_rv5c386: 617 case rtc_rv5c387a: 618 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) 619 rs5c372->time24 = 1; 620 /* alarm uses ALARM_W; and nINTRB for alarm and periodic 621 * irq, on both 386 and 387 622 */ 623 break; 624 default: 625 dev_err(&client->dev, "unknown RTC type\n"); 626 goto exit; 627 } 628 629 /* if the oscillator lost power and no other software (like 630 * the bootloader) set it up, do it here. 631 * 632 * The R2025S/D does this a little differently than the other 633 * parts, so we special case that.. 634 */ 635 err = rs5c_oscillator_setup(rs5c372); 636 if (unlikely(err < 0)) { 637 dev_err(&client->dev, "setup error\n"); 638 goto exit; 639 } 640 641 if (rs5c372_get_datetime(client, &tm) < 0) 642 dev_warn(&client->dev, "clock needs to be set\n"); 643 644 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n", 645 ({ char *s; switch (rs5c372->type) { 646 case rtc_r2025sd: s = "r2025sd"; break; 647 case rtc_r2221tl: s = "r2221tl"; break; 648 case rtc_rs5c372a: s = "rs5c372a"; break; 649 case rtc_rs5c372b: s = "rs5c372b"; break; 650 case rtc_rv5c386: s = "rv5c386"; break; 651 case rtc_rv5c387a: s = "rv5c387a"; break; 652 default: s = "chip"; break; 653 }; s;}), 654 rs5c372->time24 ? "24hr" : "am/pm" 655 ); 656 657 /* REVISIT use client->irq to register alarm irq ... */ 658 rs5c372->rtc = devm_rtc_device_register(&client->dev, 659 rs5c372_driver.driver.name, 660 &rs5c372_rtc_ops, THIS_MODULE); 661 662 if (IS_ERR(rs5c372->rtc)) { 663 err = PTR_ERR(rs5c372->rtc); 664 goto exit; 665 } 666 667 err = rs5c_sysfs_register(&client->dev); 668 if (err) 669 goto exit; 670 671 return 0; 672 673 exit: 674 return err; 675 } 676 677 static int rs5c372_remove(struct i2c_client *client) 678 { 679 rs5c_sysfs_unregister(&client->dev); 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