hp_sdc_rtc.c revision d2d23559857e5f34762c61487f8ffb2fa4d7442d
1/* 2 * HP i8042 SDC + MSM-58321 BBRTC driver. 3 * 4 * Copyright (c) 2001 Brian S. Julin 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions, and the following disclaimer, 12 * without modification. 13 * 2. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * Alternatively, this software may be distributed under the terms of the 17 * GNU General Public License ("GPL"). 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * 29 * References: 30 * System Device Controller Microprocessor Firmware Theory of Operation 31 * for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2 32 * efirtc.c by Stephane Eranian/Hewlett Packard 33 * 34 */ 35 36#include <linux/hp_sdc.h> 37#include <linux/errno.h> 38#include <linux/types.h> 39#include <linux/init.h> 40#include <linux/module.h> 41#include <linux/time.h> 42#include <linux/miscdevice.h> 43#include <linux/proc_fs.h> 44#include <linux/poll.h> 45#include <linux/rtc.h> 46#include <linux/semaphore.h> 47 48MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>"); 49MODULE_DESCRIPTION("HP i8042 SDC + MSM-58321 RTC Driver"); 50MODULE_LICENSE("Dual BSD/GPL"); 51 52#define RTC_VERSION "1.10d" 53 54static unsigned long epoch = 2000; 55 56static struct semaphore i8042tregs; 57 58static hp_sdc_irqhook hp_sdc_rtc_isr; 59 60static struct fasync_struct *hp_sdc_rtc_async_queue; 61 62static DECLARE_WAIT_QUEUE_HEAD(hp_sdc_rtc_wait); 63 64static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf, 65 size_t count, loff_t *ppos); 66 67static int hp_sdc_rtc_ioctl(struct inode *inode, struct file *file, 68 unsigned int cmd, unsigned long arg); 69 70static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait); 71 72static int hp_sdc_rtc_open(struct inode *inode, struct file *file); 73static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on); 74 75static int hp_sdc_rtc_read_proc(char *page, char **start, off_t off, 76 int count, int *eof, void *data); 77 78static void hp_sdc_rtc_isr (int irq, void *dev_id, 79 uint8_t status, uint8_t data) 80{ 81 return; 82} 83 84static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm) 85{ 86 struct semaphore tsem; 87 hp_sdc_transaction t; 88 uint8_t tseq[91]; 89 int i; 90 91 i = 0; 92 while (i < 91) { 93 tseq[i++] = HP_SDC_ACT_DATAREG | 94 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN; 95 tseq[i++] = 0x01; /* write i8042[0x70] */ 96 tseq[i] = i / 7; /* BBRTC reg address */ 97 i++; 98 tseq[i++] = HP_SDC_CMD_DO_RTCR; /* Trigger command */ 99 tseq[i++] = 2; /* expect 1 stat/dat pair back. */ 100 i++; i++; /* buffer for stat/dat pair */ 101 } 102 tseq[84] |= HP_SDC_ACT_SEMAPHORE; 103 t.endidx = 91; 104 t.seq = tseq; 105 t.act.semaphore = &tsem; 106 init_MUTEX_LOCKED(&tsem); 107 108 if (hp_sdc_enqueue_transaction(&t)) return -1; 109 110 down_interruptible(&tsem); /* Put ourselves to sleep for results. */ 111 112 /* Check for nonpresence of BBRTC */ 113 if (!((tseq[83] | tseq[90] | tseq[69] | tseq[76] | 114 tseq[55] | tseq[62] | tseq[34] | tseq[41] | 115 tseq[20] | tseq[27] | tseq[6] | tseq[13]) & 0x0f)) 116 return -1; 117 118 memset(rtctm, 0, sizeof(struct rtc_time)); 119 rtctm->tm_year = (tseq[83] & 0x0f) + (tseq[90] & 0x0f) * 10; 120 rtctm->tm_mon = (tseq[69] & 0x0f) + (tseq[76] & 0x0f) * 10; 121 rtctm->tm_mday = (tseq[55] & 0x0f) + (tseq[62] & 0x0f) * 10; 122 rtctm->tm_wday = (tseq[48] & 0x0f); 123 rtctm->tm_hour = (tseq[34] & 0x0f) + (tseq[41] & 0x0f) * 10; 124 rtctm->tm_min = (tseq[20] & 0x0f) + (tseq[27] & 0x0f) * 10; 125 rtctm->tm_sec = (tseq[6] & 0x0f) + (tseq[13] & 0x0f) * 10; 126 127 return 0; 128} 129 130static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm) 131{ 132 struct rtc_time tm, tm_last; 133 int i = 0; 134 135 /* MSM-58321 has no read latch, so must read twice and compare. */ 136 137 if (hp_sdc_rtc_do_read_bbrtc(&tm_last)) return -1; 138 if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1; 139 140 while (memcmp(&tm, &tm_last, sizeof(struct rtc_time))) { 141 if (i++ > 4) return -1; 142 memcpy(&tm_last, &tm, sizeof(struct rtc_time)); 143 if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1; 144 } 145 146 memcpy(rtctm, &tm, sizeof(struct rtc_time)); 147 148 return 0; 149} 150 151 152static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg) 153{ 154 hp_sdc_transaction t; 155 uint8_t tseq[26] = { 156 HP_SDC_ACT_PRECMD | HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN, 157 0, 158 HP_SDC_CMD_READ_T1, 2, 0, 0, 159 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN, 160 HP_SDC_CMD_READ_T2, 2, 0, 0, 161 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN, 162 HP_SDC_CMD_READ_T3, 2, 0, 0, 163 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN, 164 HP_SDC_CMD_READ_T4, 2, 0, 0, 165 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN, 166 HP_SDC_CMD_READ_T5, 2, 0, 0 167 }; 168 169 t.endidx = numreg * 5; 170 171 tseq[1] = loadcmd; 172 tseq[t.endidx - 4] |= HP_SDC_ACT_SEMAPHORE; /* numreg assumed > 1 */ 173 174 t.seq = tseq; 175 t.act.semaphore = &i8042tregs; 176 177 down_interruptible(&i8042tregs); /* Sleep if output regs in use. */ 178 179 if (hp_sdc_enqueue_transaction(&t)) return -1; 180 181 down_interruptible(&i8042tregs); /* Sleep until results come back. */ 182 up(&i8042tregs); 183 184 return (tseq[5] | 185 ((uint64_t)(tseq[10]) << 8) | ((uint64_t)(tseq[15]) << 16) | 186 ((uint64_t)(tseq[20]) << 24) | ((uint64_t)(tseq[25]) << 32)); 187} 188 189 190/* Read the i8042 real-time clock */ 191static inline int hp_sdc_rtc_read_rt(struct timeval *res) { 192 int64_t raw; 193 uint32_t tenms; 194 unsigned int days; 195 196 raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5); 197 if (raw < 0) return -1; 198 199 tenms = (uint32_t)raw & 0xffffff; 200 days = (unsigned int)(raw >> 24) & 0xffff; 201 202 res->tv_usec = (suseconds_t)(tenms % 100) * 10000; 203 res->tv_sec = (time_t)(tenms / 100) + days * 86400; 204 205 return 0; 206} 207 208 209/* Read the i8042 fast handshake timer */ 210static inline int hp_sdc_rtc_read_fhs(struct timeval *res) { 211 uint64_t raw; 212 unsigned int tenms; 213 214 raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2); 215 if (raw < 0) return -1; 216 217 tenms = (unsigned int)raw & 0xffff; 218 219 res->tv_usec = (suseconds_t)(tenms % 100) * 10000; 220 res->tv_sec = (time_t)(tenms / 100); 221 222 return 0; 223} 224 225 226/* Read the i8042 match timer (a.k.a. alarm) */ 227static inline int hp_sdc_rtc_read_mt(struct timeval *res) { 228 int64_t raw; 229 uint32_t tenms; 230 231 raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3); 232 if (raw < 0) return -1; 233 234 tenms = (uint32_t)raw & 0xffffff; 235 236 res->tv_usec = (suseconds_t)(tenms % 100) * 10000; 237 res->tv_sec = (time_t)(tenms / 100); 238 239 return 0; 240} 241 242 243/* Read the i8042 delay timer */ 244static inline int hp_sdc_rtc_read_dt(struct timeval *res) { 245 int64_t raw; 246 uint32_t tenms; 247 248 raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3); 249 if (raw < 0) return -1; 250 251 tenms = (uint32_t)raw & 0xffffff; 252 253 res->tv_usec = (suseconds_t)(tenms % 100) * 10000; 254 res->tv_sec = (time_t)(tenms / 100); 255 256 return 0; 257} 258 259 260/* Read the i8042 cycle timer (a.k.a. periodic) */ 261static inline int hp_sdc_rtc_read_ct(struct timeval *res) { 262 int64_t raw; 263 uint32_t tenms; 264 265 raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3); 266 if (raw < 0) return -1; 267 268 tenms = (uint32_t)raw & 0xffffff; 269 270 res->tv_usec = (suseconds_t)(tenms % 100) * 10000; 271 res->tv_sec = (time_t)(tenms / 100); 272 273 return 0; 274} 275 276 277/* Set the i8042 real-time clock */ 278static int hp_sdc_rtc_set_rt (struct timeval *setto) 279{ 280 uint32_t tenms; 281 unsigned int days; 282 hp_sdc_transaction t; 283 uint8_t tseq[11] = { 284 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT, 285 HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0, 286 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT, 287 HP_SDC_CMD_SET_RTD, 2, 0, 0 288 }; 289 290 t.endidx = 10; 291 292 if (0xffff < setto->tv_sec / 86400) return -1; 293 days = setto->tv_sec / 86400; 294 if (0xffff < setto->tv_usec / 1000000 / 86400) return -1; 295 days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400; 296 if (days > 0xffff) return -1; 297 298 if (0xffffff < setto->tv_sec) return -1; 299 tenms = setto->tv_sec * 100; 300 if (0xffffff < setto->tv_usec / 10000) return -1; 301 tenms += setto->tv_usec / 10000; 302 if (tenms > 0xffffff) return -1; 303 304 tseq[3] = (uint8_t)(tenms & 0xff); 305 tseq[4] = (uint8_t)((tenms >> 8) & 0xff); 306 tseq[5] = (uint8_t)((tenms >> 16) & 0xff); 307 308 tseq[9] = (uint8_t)(days & 0xff); 309 tseq[10] = (uint8_t)((days >> 8) & 0xff); 310 311 t.seq = tseq; 312 313 if (hp_sdc_enqueue_transaction(&t)) return -1; 314 return 0; 315} 316 317/* Set the i8042 fast handshake timer */ 318static int hp_sdc_rtc_set_fhs (struct timeval *setto) 319{ 320 uint32_t tenms; 321 hp_sdc_transaction t; 322 uint8_t tseq[5] = { 323 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT, 324 HP_SDC_CMD_SET_FHS, 2, 0, 0 325 }; 326 327 t.endidx = 4; 328 329 if (0xffff < setto->tv_sec) return -1; 330 tenms = setto->tv_sec * 100; 331 if (0xffff < setto->tv_usec / 10000) return -1; 332 tenms += setto->tv_usec / 10000; 333 if (tenms > 0xffff) return -1; 334 335 tseq[3] = (uint8_t)(tenms & 0xff); 336 tseq[4] = (uint8_t)((tenms >> 8) & 0xff); 337 338 t.seq = tseq; 339 340 if (hp_sdc_enqueue_transaction(&t)) return -1; 341 return 0; 342} 343 344 345/* Set the i8042 match timer (a.k.a. alarm) */ 346#define hp_sdc_rtc_set_mt (setto) \ 347 hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT) 348 349/* Set the i8042 delay timer */ 350#define hp_sdc_rtc_set_dt (setto) \ 351 hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT) 352 353/* Set the i8042 cycle timer (a.k.a. periodic) */ 354#define hp_sdc_rtc_set_ct (setto) \ 355 hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT) 356 357/* Set one of the i8042 3-byte wide timers */ 358static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd) 359{ 360 uint32_t tenms; 361 hp_sdc_transaction t; 362 uint8_t tseq[6] = { 363 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT, 364 0, 3, 0, 0, 0 365 }; 366 367 t.endidx = 6; 368 369 if (0xffffff < setto->tv_sec) return -1; 370 tenms = setto->tv_sec * 100; 371 if (0xffffff < setto->tv_usec / 10000) return -1; 372 tenms += setto->tv_usec / 10000; 373 if (tenms > 0xffffff) return -1; 374 375 tseq[1] = setcmd; 376 tseq[3] = (uint8_t)(tenms & 0xff); 377 tseq[4] = (uint8_t)((tenms >> 8) & 0xff); 378 tseq[5] = (uint8_t)((tenms >> 16) & 0xff); 379 380 t.seq = tseq; 381 382 if (hp_sdc_enqueue_transaction(&t)) { 383 return -1; 384 } 385 return 0; 386} 387 388static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf, 389 size_t count, loff_t *ppos) { 390 ssize_t retval; 391 392 if (count < sizeof(unsigned long)) 393 return -EINVAL; 394 395 retval = put_user(68, (unsigned long __user *)buf); 396 return retval; 397} 398 399static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait) 400{ 401 unsigned long l; 402 403 l = 0; 404 if (l != 0) 405 return POLLIN | POLLRDNORM; 406 return 0; 407} 408 409static int hp_sdc_rtc_open(struct inode *inode, struct file *file) 410{ 411 return 0; 412} 413 414static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on) 415{ 416 return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue); 417} 418 419static int hp_sdc_rtc_proc_output (char *buf) 420{ 421#define YN(bit) ("no") 422#define NY(bit) ("yes") 423 char *p; 424 struct rtc_time tm; 425 struct timeval tv; 426 427 memset(&tm, 0, sizeof(struct rtc_time)); 428 429 p = buf; 430 431 if (hp_sdc_rtc_read_bbrtc(&tm)) { 432 p += sprintf(p, "BBRTC\t\t: READ FAILED!\n"); 433 } else { 434 p += sprintf(p, 435 "rtc_time\t: %02d:%02d:%02d\n" 436 "rtc_date\t: %04d-%02d-%02d\n" 437 "rtc_epoch\t: %04lu\n", 438 tm.tm_hour, tm.tm_min, tm.tm_sec, 439 tm.tm_year + 1900, tm.tm_mon + 1, 440 tm.tm_mday, epoch); 441 } 442 443 if (hp_sdc_rtc_read_rt(&tv)) { 444 p += sprintf(p, "i8042 rtc\t: READ FAILED!\n"); 445 } else { 446 p += sprintf(p, "i8042 rtc\t: %ld.%02d seconds\n", 447 tv.tv_sec, (int)tv.tv_usec/1000); 448 } 449 450 if (hp_sdc_rtc_read_fhs(&tv)) { 451 p += sprintf(p, "handshake\t: READ FAILED!\n"); 452 } else { 453 p += sprintf(p, "handshake\t: %ld.%02d seconds\n", 454 tv.tv_sec, (int)tv.tv_usec/1000); 455 } 456 457 if (hp_sdc_rtc_read_mt(&tv)) { 458 p += sprintf(p, "alarm\t\t: READ FAILED!\n"); 459 } else { 460 p += sprintf(p, "alarm\t\t: %ld.%02d seconds\n", 461 tv.tv_sec, (int)tv.tv_usec/1000); 462 } 463 464 if (hp_sdc_rtc_read_dt(&tv)) { 465 p += sprintf(p, "delay\t\t: READ FAILED!\n"); 466 } else { 467 p += sprintf(p, "delay\t\t: %ld.%02d seconds\n", 468 tv.tv_sec, (int)tv.tv_usec/1000); 469 } 470 471 if (hp_sdc_rtc_read_ct(&tv)) { 472 p += sprintf(p, "periodic\t: READ FAILED!\n"); 473 } else { 474 p += sprintf(p, "periodic\t: %ld.%02d seconds\n", 475 tv.tv_sec, (int)tv.tv_usec/1000); 476 } 477 478 p += sprintf(p, 479 "DST_enable\t: %s\n" 480 "BCD\t\t: %s\n" 481 "24hr\t\t: %s\n" 482 "square_wave\t: %s\n" 483 "alarm_IRQ\t: %s\n" 484 "update_IRQ\t: %s\n" 485 "periodic_IRQ\t: %s\n" 486 "periodic_freq\t: %ld\n" 487 "batt_status\t: %s\n", 488 YN(RTC_DST_EN), 489 NY(RTC_DM_BINARY), 490 YN(RTC_24H), 491 YN(RTC_SQWE), 492 YN(RTC_AIE), 493 YN(RTC_UIE), 494 YN(RTC_PIE), 495 1UL, 496 1 ? "okay" : "dead"); 497 498 return p - buf; 499#undef YN 500#undef NY 501} 502 503static int hp_sdc_rtc_read_proc(char *page, char **start, off_t off, 504 int count, int *eof, void *data) 505{ 506 int len = hp_sdc_rtc_proc_output (page); 507 if (len <= off+count) *eof = 1; 508 *start = page + off; 509 len -= off; 510 if (len>count) len = count; 511 if (len<0) len = 0; 512 return len; 513} 514 515static int hp_sdc_rtc_ioctl(struct inode *inode, struct file *file, 516 unsigned int cmd, unsigned long arg) 517{ 518#if 1 519 return -EINVAL; 520#else 521 522 struct rtc_time wtime; 523 struct timeval ttime; 524 int use_wtime = 0; 525 526 /* This needs major work. */ 527 528 switch (cmd) { 529 530 case RTC_AIE_OFF: /* Mask alarm int. enab. bit */ 531 case RTC_AIE_ON: /* Allow alarm interrupts. */ 532 case RTC_PIE_OFF: /* Mask periodic int. enab. bit */ 533 case RTC_PIE_ON: /* Allow periodic ints */ 534 case RTC_UIE_ON: /* Allow ints for RTC updates. */ 535 case RTC_UIE_OFF: /* Allow ints for RTC updates. */ 536 { 537 /* We cannot mask individual user timers and we 538 cannot tell them apart when they occur, so it 539 would be disingenuous to succeed these IOCTLs */ 540 return -EINVAL; 541 } 542 case RTC_ALM_READ: /* Read the present alarm time */ 543 { 544 if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT; 545 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT; 546 547 wtime.tm_hour = ttime.tv_sec / 3600; ttime.tv_sec %= 3600; 548 wtime.tm_min = ttime.tv_sec / 60; ttime.tv_sec %= 60; 549 wtime.tm_sec = ttime.tv_sec; 550 551 break; 552 } 553 case RTC_IRQP_READ: /* Read the periodic IRQ rate. */ 554 { 555 return put_user(hp_sdc_rtc_freq, (unsigned long *)arg); 556 } 557 case RTC_IRQP_SET: /* Set periodic IRQ rate. */ 558 { 559 /* 560 * The max we can do is 100Hz. 561 */ 562 563 if ((arg < 1) || (arg > 100)) return -EINVAL; 564 ttime.tv_sec = 0; 565 ttime.tv_usec = 1000000 / arg; 566 if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT; 567 hp_sdc_rtc_freq = arg; 568 return 0; 569 } 570 case RTC_ALM_SET: /* Store a time into the alarm */ 571 { 572 /* 573 * This expects a struct hp_sdc_rtc_time. Writing 0xff means 574 * "don't care" or "match all" for PC timers. The HP SDC 575 * does not support that perk, but it could be emulated fairly 576 * easily. Only the tm_hour, tm_min and tm_sec are used. 577 * We could do it with 10ms accuracy with the HP SDC, if the 578 * rtc interface left us a way to do that. 579 */ 580 struct hp_sdc_rtc_time alm_tm; 581 582 if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg, 583 sizeof(struct hp_sdc_rtc_time))) 584 return -EFAULT; 585 586 if (alm_tm.tm_hour > 23) return -EINVAL; 587 if (alm_tm.tm_min > 59) return -EINVAL; 588 if (alm_tm.tm_sec > 59) return -EINVAL; 589 590 ttime.sec = alm_tm.tm_hour * 3600 + 591 alm_tm.tm_min * 60 + alm_tm.tm_sec; 592 ttime.usec = 0; 593 if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT; 594 return 0; 595 } 596 case RTC_RD_TIME: /* Read the time/date from RTC */ 597 { 598 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT; 599 break; 600 } 601 case RTC_SET_TIME: /* Set the RTC */ 602 { 603 struct rtc_time hp_sdc_rtc_tm; 604 unsigned char mon, day, hrs, min, sec, leap_yr; 605 unsigned int yrs; 606 607 if (!capable(CAP_SYS_TIME)) 608 return -EACCES; 609 if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg, 610 sizeof(struct rtc_time))) 611 return -EFAULT; 612 613 yrs = hp_sdc_rtc_tm.tm_year + 1900; 614 mon = hp_sdc_rtc_tm.tm_mon + 1; /* tm_mon starts at zero */ 615 day = hp_sdc_rtc_tm.tm_mday; 616 hrs = hp_sdc_rtc_tm.tm_hour; 617 min = hp_sdc_rtc_tm.tm_min; 618 sec = hp_sdc_rtc_tm.tm_sec; 619 620 if (yrs < 1970) 621 return -EINVAL; 622 623 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400)); 624 625 if ((mon > 12) || (day == 0)) 626 return -EINVAL; 627 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr))) 628 return -EINVAL; 629 if ((hrs >= 24) || (min >= 60) || (sec >= 60)) 630 return -EINVAL; 631 632 if ((yrs -= eH) > 255) /* They are unsigned */ 633 return -EINVAL; 634 635 636 return 0; 637 } 638 case RTC_EPOCH_READ: /* Read the epoch. */ 639 { 640 return put_user (epoch, (unsigned long *)arg); 641 } 642 case RTC_EPOCH_SET: /* Set the epoch. */ 643 { 644 /* 645 * There were no RTC clocks before 1900. 646 */ 647 if (arg < 1900) 648 return -EINVAL; 649 if (!capable(CAP_SYS_TIME)) 650 return -EACCES; 651 652 epoch = arg; 653 return 0; 654 } 655 default: 656 return -EINVAL; 657 } 658 return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0; 659#endif 660} 661 662static const struct file_operations hp_sdc_rtc_fops = { 663 .owner = THIS_MODULE, 664 .llseek = no_llseek, 665 .read = hp_sdc_rtc_read, 666 .poll = hp_sdc_rtc_poll, 667 .ioctl = hp_sdc_rtc_ioctl, 668 .open = hp_sdc_rtc_open, 669 .fasync = hp_sdc_rtc_fasync, 670}; 671 672static struct miscdevice hp_sdc_rtc_dev = { 673 .minor = RTC_MINOR, 674 .name = "rtc_HIL", 675 .fops = &hp_sdc_rtc_fops 676}; 677 678static int __init hp_sdc_rtc_init(void) 679{ 680 int ret; 681 682#ifdef __mc68000__ 683 if (!MACH_IS_HP300) 684 return -ENODEV; 685#endif 686 687 init_MUTEX(&i8042tregs); 688 689 if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr))) 690 return ret; 691 if (misc_register(&hp_sdc_rtc_dev) != 0) 692 printk(KERN_INFO "Could not register misc. dev for i8042 rtc\n"); 693 694 create_proc_read_entry ("driver/rtc", 0, NULL, 695 hp_sdc_rtc_read_proc, NULL); 696 697 printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded " 698 "(RTC v " RTC_VERSION ")\n"); 699 700 return 0; 701} 702 703static void __exit hp_sdc_rtc_exit(void) 704{ 705 remove_proc_entry ("driver/rtc", NULL); 706 misc_deregister(&hp_sdc_rtc_dev); 707 hp_sdc_release_timer_irq(hp_sdc_rtc_isr); 708 printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n"); 709} 710 711module_init(hp_sdc_rtc_init); 712module_exit(hp_sdc_rtc_exit); 713