drivers/input/misc/hp_sdc_rtc.c

   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/mutex.h>
  47 #include <linux/semaphore.h>
  48
  49 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
  50 MODULE_DESCRIPTION("HP i8042 SDC + MSM-58321 RTC Driver");
  51 MODULE_LICENSE("Dual BSD/GPL");
  52
  53 #define RTC_VERSION "1.10d"
  54
  55 static DEFINE_MUTEX(hp_sdc_rtc_mutex);
  56 static unsigned long epoch = 2000;
  57
  58 static struct semaphore i8042tregs;
  59
  60 static hp_sdc_irqhook hp_sdc_rtc_isr;
  61
  62 static struct fasync_struct *hp_sdc_rtc_async_queue;
  63
  64 static DECLARE_WAIT_QUEUE_HEAD(hp_sdc_rtc_wait);
  65
  66 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
  67                                size_t count, loff_t *ppos);
  68
  69 static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
  70                                       unsigned int cmd, unsigned long arg);
  71
  72 static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait);
  73
  74 static int hp_sdc_rtc_open(struct inode *inode, struct file *file);
  75 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on);
  76
  77 static int hp_sdc_rtc_read_proc(char *page, char **start, off_t off,
  78                                 int count, int *eof, void *data);
  79
  80 static void hp_sdc_rtc_isr (int irq, void *dev_id,
  81                             uint8_t status, uint8_t data)
  82 {
  83         return;
  84 }
  85
  86 static int hp_sdc_rtc_do_read_bbrtc (struct rtc_time *rtctm)
  87 {
  88         struct semaphore tsem;
  89         hp_sdc_transaction t;
  90         uint8_t tseq[91];
  91         int i;
  92
  93         i = 0;
  94         while (i < 91) {
  95                 tseq[i++] = HP_SDC_ACT_DATAREG |
  96                         HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN;
  97                 tseq[i++] = 0x01;                       /* write i8042[0x70] */
  98                 tseq[i]   = i / 7;                      /* BBRTC reg address */
  99                 i++;
 100                 tseq[i++] = HP_SDC_CMD_DO_RTCR;         /* Trigger command   */
 101                 tseq[i++] = 2;          /* expect 1 stat/dat pair back.   */
 102                 i++; i++;               /* buffer for stat/dat pair       */
 103         }
 104         tseq[84] |= HP_SDC_ACT_SEMAPHORE;
 105         t.endidx =              91;
 106         t.seq =                 tseq;
 107         t.act.semaphore =       &tsem;
 108         sema_init(&tsem, 0);
 109
 110         if (hp_sdc_enqueue_transaction(&t)) return -1;
 111
 112         down_interruptible(&tsem);  /* Put ourselves to sleep for results. */
 113
 114         /* Check for nonpresence of BBRTC */
 115         if (!((tseq[83] | tseq[90] | tseq[69] | tseq[76] |
 116                tseq[55] | tseq[62] | tseq[34] | tseq[41] |
 117                tseq[20] | tseq[27] | tseq[6]  | tseq[13]) & 0x0f))
 118                 return -1;
 119
 120         memset(rtctm, 0, sizeof(struct rtc_time));
 121         rtctm->tm_year = (tseq[83] & 0x0f) + (tseq[90] & 0x0f) * 10;
 122         rtctm->tm_mon  = (tseq[69] & 0x0f) + (tseq[76] & 0x0f) * 10;
 123         rtctm->tm_mday = (tseq[55] & 0x0f) + (tseq[62] & 0x0f) * 10;
 124         rtctm->tm_wday = (tseq[48] & 0x0f);
 125         rtctm->tm_hour = (tseq[34] & 0x0f) + (tseq[41] & 0x0f) * 10;
 126         rtctm->tm_min  = (tseq[20] & 0x0f) + (tseq[27] & 0x0f) * 10;
 127         rtctm->tm_sec  = (tseq[6]  & 0x0f) + (tseq[13] & 0x0f) * 10;
 128
 129         return 0;
 130 }
 131
 132 static int hp_sdc_rtc_read_bbrtc (struct rtc_time *rtctm)
 133 {
 134         struct rtc_time tm, tm_last;
 135         int i = 0;
 136
 137         /* MSM-58321 has no read latch, so must read twice and compare. */
 138
 139         if (hp_sdc_rtc_do_read_bbrtc(&tm_last)) return -1;
 140         if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
 141
 142         while (memcmp(&tm, &tm_last, sizeof(struct rtc_time))) {
 143                 if (i++ > 4) return -1;
 144                 memcpy(&tm_last, &tm, sizeof(struct rtc_time));
 145                 if (hp_sdc_rtc_do_read_bbrtc(&tm)) return -1;
 146         }
 147
 148         memcpy(rtctm, &tm, sizeof(struct rtc_time));
 149
 150         return 0;
 151 }
 152
 153
 154 static int64_t hp_sdc_rtc_read_i8042timer (uint8_t loadcmd, int numreg)
 155 {
 156         hp_sdc_transaction t;
 157         uint8_t tseq[26] = {
 158                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 159                 0,
 160                 HP_SDC_CMD_READ_T1, 2, 0, 0,
 161                 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 162                 HP_SDC_CMD_READ_T2, 2, 0, 0,
 163                 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 164                 HP_SDC_CMD_READ_T3, 2, 0, 0,
 165                 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 166                 HP_SDC_CMD_READ_T4, 2, 0, 0,
 167                 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN,
 168                 HP_SDC_CMD_READ_T5, 2, 0, 0
 169         };
 170
 171         t.endidx = numreg * 5;
 172
 173         tseq[1] = loadcmd;
 174         tseq[t.endidx - 4] |= HP_SDC_ACT_SEMAPHORE; /* numreg assumed > 1 */
 175
 176         t.seq =                 tseq;
 177         t.act.semaphore =       &i8042tregs;
 178
 179         down_interruptible(&i8042tregs);  /* Sleep if output regs in use. */
 180
 181         if (hp_sdc_enqueue_transaction(&t)) return -1;
 182
 183         down_interruptible(&i8042tregs);  /* Sleep until results come back. */
 184         up(&i8042tregs);
 185
 186         return (tseq[5] |
 187                 ((uint64_t)(tseq[10]) << 8)  | ((uint64_t)(tseq[15]) << 16) |
 188                 ((uint64_t)(tseq[20]) << 24) | ((uint64_t)(tseq[25]) << 32));
 189 }
 190
 191
 192 /* Read the i8042 real-time clock */
 193 static inline int hp_sdc_rtc_read_rt(struct timeval *res) {
 194         int64_t raw;
 195         uint32_t tenms;
 196         unsigned int days;
 197
 198         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5);
 199         if (raw < 0) return -1;
 200
 201         tenms = (uint32_t)raw & 0xffffff;
 202         days  = (unsigned int)(raw >> 24) & 0xffff;
 203
 204         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 205         res->tv_sec =  (time_t)(tenms / 100) + days * 86400;
 206
 207         return 0;
 208 }
 209
 210
 211 /* Read the i8042 fast handshake timer */
 212 static inline int hp_sdc_rtc_read_fhs(struct timeval *res) {
 213         int64_t raw;
 214         unsigned int tenms;
 215
 216         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
 217         if (raw < 0) return -1;
 218
 219         tenms = (unsigned int)raw & 0xffff;
 220
 221         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 222         res->tv_sec  = (time_t)(tenms / 100);
 223
 224         return 0;
 225 }
 226
 227
 228 /* Read the i8042 match timer (a.k.a. alarm) */
 229 static inline int hp_sdc_rtc_read_mt(struct timeval *res) {
 230         int64_t raw;
 231         uint32_t tenms;
 232
 233         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
 234         if (raw < 0) return -1;
 235
 236         tenms = (uint32_t)raw & 0xffffff;
 237
 238         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 239         res->tv_sec  = (time_t)(tenms / 100);
 240
 241         return 0;
 242 }
 243
 244
 245 /* Read the i8042 delay timer */
 246 static inline int hp_sdc_rtc_read_dt(struct timeval *res) {
 247         int64_t raw;
 248         uint32_t tenms;
 249
 250         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
 251         if (raw < 0) return -1;
 252
 253         tenms = (uint32_t)raw & 0xffffff;
 254
 255         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 256         res->tv_sec  = (time_t)(tenms / 100);
 257
 258         return 0;
 259 }
 260
 261
 262 /* Read the i8042 cycle timer (a.k.a. periodic) */
 263 static inline int hp_sdc_rtc_read_ct(struct timeval *res) {
 264         int64_t raw;
 265         uint32_t tenms;
 266
 267         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
 268         if (raw < 0) return -1;
 269
 270         tenms = (uint32_t)raw & 0xffffff;
 271
 272         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 273         res->tv_sec  = (time_t)(tenms / 100);
 274
 275         return 0;
 276 }
 277
 278
 279 /* Set the i8042 real-time clock */
 280 static int hp_sdc_rtc_set_rt (struct timeval *setto)
 281 {
 282         uint32_t tenms;
 283         unsigned int days;
 284         hp_sdc_transaction t;
 285         uint8_t tseq[11] = {
 286                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 287                 HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0,
 288                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 289                 HP_SDC_CMD_SET_RTD, 2, 0, 0
 290         };
 291
 292         t.endidx = 10;
 293
 294         if (0xffff < setto->tv_sec / 86400) return -1;
 295         days = setto->tv_sec / 86400;
 296         if (0xffff < setto->tv_usec / 1000000 / 86400) return -1;
 297         days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400;
 298         if (days > 0xffff) return -1;
 299
 300         if (0xffffff < setto->tv_sec) return -1;
 301         tenms  = setto->tv_sec * 100;
 302         if (0xffffff < setto->tv_usec / 10000) return -1;
 303         tenms += setto->tv_usec / 10000;
 304         if (tenms > 0xffffff) return -1;
 305
 306         tseq[3] = (uint8_t)(tenms & 0xff);
 307         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 308         tseq[5] = (uint8_t)((tenms >> 16) & 0xff);
 309
 310         tseq[9] = (uint8_t)(days & 0xff);
 311         tseq[10] = (uint8_t)((days >> 8) & 0xff);
 312
 313         t.seq = tseq;
 314
 315         if (hp_sdc_enqueue_transaction(&t)) return -1;
 316         return 0;
 317 }
 318
 319 /* Set the i8042 fast handshake timer */
 320 static int hp_sdc_rtc_set_fhs (struct timeval *setto)
 321 {
 322         uint32_t tenms;
 323         hp_sdc_transaction t;
 324         uint8_t tseq[5] = {
 325                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 326                 HP_SDC_CMD_SET_FHS, 2, 0, 0
 327         };
 328
 329         t.endidx = 4;
 330
 331         if (0xffff < setto->tv_sec) return -1;
 332         tenms  = setto->tv_sec * 100;
 333         if (0xffff < setto->tv_usec / 10000) return -1;
 334         tenms += setto->tv_usec / 10000;
 335         if (tenms > 0xffff) return -1;
 336
 337         tseq[3] = (uint8_t)(tenms & 0xff);
 338         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 339
 340         t.seq = tseq;
 341
 342         if (hp_sdc_enqueue_transaction(&t)) return -1;
 343         return 0;
 344 }
 345
 346
 347 /* Set the i8042 match timer (a.k.a. alarm) */
 348 #define hp_sdc_rtc_set_mt (setto) \
 349         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT)
 350
 351 /* Set the i8042 delay timer */
 352 #define hp_sdc_rtc_set_dt (setto) \
 353         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT)
 354
 355 /* Set the i8042 cycle timer (a.k.a. periodic) */
 356 #define hp_sdc_rtc_set_ct (setto) \
 357         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT)
 358
 359 /* Set one of the i8042 3-byte wide timers */
 360 static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
 361 {
 362         uint32_t tenms;
 363         hp_sdc_transaction t;
 364         uint8_t tseq[6] = {
 365                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 366                 0, 3, 0, 0, 0
 367         };
 368
 369         t.endidx = 6;
 370
 371         if (0xffffff < setto->tv_sec) return -1;
 372         tenms  = setto->tv_sec * 100;
 373         if (0xffffff < setto->tv_usec / 10000) return -1;
 374         tenms += setto->tv_usec / 10000;
 375         if (tenms > 0xffffff) return -1;
 376
 377         tseq[1] = setcmd;
 378         tseq[3] = (uint8_t)(tenms & 0xff);
 379         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 380         tseq[5] = (uint8_t)((tenms >> 16)  & 0xff);
 381
 382         t.seq =                 tseq;
 383
 384         if (hp_sdc_enqueue_transaction(&t)) {
 385                 return -1;
 386         }
 387         return 0;
 388 }
 389
 390 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
 391                                size_t count, loff_t *ppos) {
 392         ssize_t retval;
 393
 394         if (count < sizeof(unsigned long))
 395                 return -EINVAL;
 396
 397         retval = put_user(68, (unsigned long __user *)buf);
 398         return retval;
 399 }
 400
 401 static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait)
 402 {
 403         unsigned long l;
 404
 405         l = 0;
 406         if (l != 0)
 407                 return POLLIN | POLLRDNORM;
 408         return 0;
 409 }
 410
 411 static int hp_sdc_rtc_open(struct inode *inode, struct file *file)
 412 {
 413         return 0;
 414 }
 415
 416 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
 417 {
 418         return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
 419 }
 420
 421 static int hp_sdc_rtc_proc_output (char *buf)
 422 {
 423 #define YN(bit) ("no")
 424 #define NY(bit) ("yes")
 425         char *p;
 426         struct rtc_time tm;
 427         struct timeval tv;
 428
 429         memset(&tm, 0, sizeof(struct rtc_time));
 430
 431         p = buf;
 432
 433         if (hp_sdc_rtc_read_bbrtc(&tm)) {
 434                 p += sprintf(p, "BBRTC\t\t: READ FAILED!\n");
 435         } else {
 436                 p += sprintf(p,
 437                              "rtc_time\t: %02d:%02d:%02d\n"
 438                              "rtc_date\t: %04d-%02d-%02d\n"
 439                              "rtc_epoch\t: %04lu\n",
 440                              tm.tm_hour, tm.tm_min, tm.tm_sec,
 441                              tm.tm_year + 1900, tm.tm_mon + 1,
 442                              tm.tm_mday, epoch);
 443         }
 444
 445         if (hp_sdc_rtc_read_rt(&tv)) {
 446                 p += sprintf(p, "i8042 rtc\t: READ FAILED!\n");
 447         } else {
 448                 p += sprintf(p, "i8042 rtc\t: %ld.%02d seconds\n",
 449                              tv.tv_sec, (int)tv.tv_usec/1000);
 450         }
 451
 452         if (hp_sdc_rtc_read_fhs(&tv)) {
 453                 p += sprintf(p, "handshake\t: READ FAILED!\n");
 454         } else {
 455                 p += sprintf(p, "handshake\t: %ld.%02d seconds\n",
 456                              tv.tv_sec, (int)tv.tv_usec/1000);
 457         }
 458
 459         if (hp_sdc_rtc_read_mt(&tv)) {
 460                 p += sprintf(p, "alarm\t\t: READ FAILED!\n");
 461         } else {
 462                 p += sprintf(p, "alarm\t\t: %ld.%02d seconds\n",
 463                              tv.tv_sec, (int)tv.tv_usec/1000);
 464         }
 465
 466         if (hp_sdc_rtc_read_dt(&tv)) {
 467                 p += sprintf(p, "delay\t\t: READ FAILED!\n");
 468         } else {
 469                 p += sprintf(p, "delay\t\t: %ld.%02d seconds\n",
 470                              tv.tv_sec, (int)tv.tv_usec/1000);
 471         }
 472
 473         if (hp_sdc_rtc_read_ct(&tv)) {
 474                 p += sprintf(p, "periodic\t: READ FAILED!\n");
 475         } else {
 476                 p += sprintf(p, "periodic\t: %ld.%02d seconds\n",
 477                              tv.tv_sec, (int)tv.tv_usec/1000);
 478         }
 479
 480         p += sprintf(p,
 481                      "DST_enable\t: %s\n"
 482                      "BCD\t\t: %s\n"
 483                      "24hr\t\t: %s\n"
 484                      "square_wave\t: %s\n"
 485                      "alarm_IRQ\t: %s\n"
 486                      "update_IRQ\t: %s\n"
 487                      "periodic_IRQ\t: %s\n"
 488                      "periodic_freq\t: %ld\n"
 489                      "batt_status\t: %s\n",
 490                      YN(RTC_DST_EN),
 491                      NY(RTC_DM_BINARY),
 492                      YN(RTC_24H),
 493                      YN(RTC_SQWE),
 494                      YN(RTC_AIE),
 495                      YN(RTC_UIE),
 496                      YN(RTC_PIE),
 497                      1UL,
 498                      1 ? "okay" : "dead");
 499
 500         return  p - buf;
 501 #undef YN
 502 #undef NY
 503 }
 504
 505 static int hp_sdc_rtc_read_proc(char *page, char **start, off_t off,
 506                          int count, int *eof, void *data)
 507 {
 508         int len = hp_sdc_rtc_proc_output (page);
 509         if (len <= off+count) *eof = 1;
 510         *start = page + off;
 511         len -= off;
 512         if (len>count) len = count;
 513         if (len<0) len = 0;
 514         return len;
 515 }
 516
 517 static int hp_sdc_rtc_ioctl(struct file *file,
 518                             unsigned int cmd, unsigned long arg)
 519 {
 520 #if 1
 521         return -EINVAL;
 522 #else
 523
 524         struct rtc_time wtime;
 525         struct timeval ttime;
 526         int use_wtime = 0;
 527
 528         /* This needs major work. */
 529
 530         switch (cmd) {
 531
 532         case RTC_AIE_OFF:       /* Mask alarm int. enab. bit    */
 533         case RTC_AIE_ON:        /* Allow alarm interrupts.      */
 534         case RTC_PIE_OFF:       /* Mask periodic int. enab. bit */
 535         case RTC_PIE_ON:        /* Allow periodic ints          */
 536         case RTC_UIE_ON:        /* Allow ints for RTC updates.  */
 537         case RTC_UIE_OFF:       /* Allow ints for RTC updates.  */
 538         {
 539                 /* We cannot mask individual user timers and we
 540                    cannot tell them apart when they occur, so it
 541                    would be disingenuous to succeed these IOCTLs */
 542                 return -EINVAL;
 543         }
 544         case RTC_ALM_READ:      /* Read the present alarm time */
 545         {
 546                 if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT;
 547                 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
 548
 549                 wtime.tm_hour = ttime.tv_sec / 3600;  ttime.tv_sec %= 3600;
 550                 wtime.tm_min  = ttime.tv_sec / 60;    ttime.tv_sec %= 60;
 551                 wtime.tm_sec  = ttime.tv_sec;
 552
 553                 break;
 554         }
 555         case RTC_IRQP_READ:     /* Read the periodic IRQ rate.  */
 556         {
 557                 return put_user(hp_sdc_rtc_freq, (unsigned long *)arg);
 558         }
 559         case RTC_IRQP_SET:      /* Set periodic IRQ rate.       */
 560         {
 561                 /*
 562                  * The max we can do is 100Hz.
 563                  */
 564
 565                 if ((arg < 1) || (arg > 100)) return -EINVAL;
 566                 ttime.tv_sec = 0;
 567                 ttime.tv_usec = 1000000 / arg;
 568                 if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT;
 569                 hp_sdc_rtc_freq = arg;
 570                 return 0;
 571         }
 572         case RTC_ALM_SET:       /* Store a time into the alarm */
 573         {
 574                 /*
 575                  * This expects a struct hp_sdc_rtc_time. Writing 0xff means
 576                  * "don't care" or "match all" for PC timers.  The HP SDC
 577                  * does not support that perk, but it could be emulated fairly
 578                  * easily.  Only the tm_hour, tm_min and tm_sec are used.
 579                  * We could do it with 10ms accuracy with the HP SDC, if the
 580                  * rtc interface left us a way to do that.
 581                  */
 582                 struct hp_sdc_rtc_time alm_tm;
 583
 584                 if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg,
 585                                    sizeof(struct hp_sdc_rtc_time)))
 586                        return -EFAULT;
 587
 588                 if (alm_tm.tm_hour > 23) return -EINVAL;
 589                 if (alm_tm.tm_min  > 59) return -EINVAL;
 590                 if (alm_tm.tm_sec  > 59) return -EINVAL;
 591
 592                 ttime.sec = alm_tm.tm_hour * 3600 +
 593                   alm_tm.tm_min * 60 + alm_tm.tm_sec;
 594                 ttime.usec = 0;
 595                 if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT;
 596                 return 0;
 597         }
 598         case RTC_RD_TIME:       /* Read the time/date from RTC  */
 599         {
 600                 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
 601                 break;
 602         }
 603         case RTC_SET_TIME:      /* Set the RTC */
 604         {
 605                 struct rtc_time hp_sdc_rtc_tm;
 606                 unsigned char mon, day, hrs, min, sec, leap_yr;
 607                 unsigned int yrs;
 608
 609                 if (!capable(CAP_SYS_TIME))
 610                         return -EACCES;
 611                 if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg,
 612                                    sizeof(struct rtc_time)))
 613                         return -EFAULT;
 614
 615                 yrs = hp_sdc_rtc_tm.tm_year + 1900;
 616                 mon = hp_sdc_rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
 617                 day = hp_sdc_rtc_tm.tm_mday;
 618                 hrs = hp_sdc_rtc_tm.tm_hour;
 619                 min = hp_sdc_rtc_tm.tm_min;
 620                 sec = hp_sdc_rtc_tm.tm_sec;
 621
 622                 if (yrs < 1970)
 623                         return -EINVAL;
 624
 625                 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
 626
 627                 if ((mon > 12) || (day == 0))
 628                         return -EINVAL;
 629                 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
 630                         return -EINVAL;
 631                 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
 632                         return -EINVAL;
 633
 634                 if ((yrs -= eH) > 255)    /* They are unsigned */
 635                         return -EINVAL;
 636
 637
 638                 return 0;
 639         }
 640         case RTC_EPOCH_READ:    /* Read the epoch.      */
 641         {
 642                 return put_user (epoch, (unsigned long *)arg);
 643         }
 644         case RTC_EPOCH_SET:     /* Set the epoch.       */
 645         {
 646                 /*
 647                  * There were no RTC clocks before 1900.
 648                  */
 649                 if (arg < 1900)
 650                   return -EINVAL;
 651                 if (!capable(CAP_SYS_TIME))
 652                   return -EACCES;
 653
 654                 epoch = arg;
 655                 return 0;
 656         }
 657         default:
 658                 return -EINVAL;
 659         }
 660         return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
 661 #endif
 662 }
 663
 664 static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
 665                                       unsigned int cmd, unsigned long arg)
 666 {
 667         int ret;
 668
 669         mutex_lock(&hp_sdc_rtc_mutex);
 670         ret = hp_sdc_rtc_ioctl(file, cmd, arg);
 671         mutex_unlock(&hp_sdc_rtc_mutex);
 672
 673         return ret;
 674 }
 675
 676
 677 static const struct file_operations hp_sdc_rtc_fops = {
 678         .owner =                THIS_MODULE,
 679         .llseek =               no_llseek,
 680         .read =                 hp_sdc_rtc_read,
 681         .poll =                 hp_sdc_rtc_poll,
 682         .unlocked_ioctl =       hp_sdc_rtc_unlocked_ioctl,
 683         .open =                 hp_sdc_rtc_open,
 684         .fasync =               hp_sdc_rtc_fasync,
 685 };
 686
 687 static struct miscdevice hp_sdc_rtc_dev = {
 688         .minor =        RTC_MINOR,
 689         .name =         "rtc_HIL",
 690         .fops =         &hp_sdc_rtc_fops
 691 };
 692
 693 static int __init hp_sdc_rtc_init(void)
 694 {
 695         int ret;
 696
 697 #ifdef __mc68000__
 698         if (!MACH_IS_HP300)
 699                 return -ENODEV;
 700 #endif
 701
 702         sema_init(&i8042tregs, 1);
 703
 704         if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
 705                 return ret;
 706         if (misc_register(&hp_sdc_rtc_dev) != 0)
 707                 printk(KERN_INFO "Could not register misc. dev for i8042 rtc\n");
 708
 709         create_proc_read_entry ("driver/rtc", 0, NULL,
 710                                 hp_sdc_rtc_read_proc, NULL);
 711
 712         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
 713                          "(RTC v " RTC_VERSION ")\n");
 714
 715         return 0;
 716 }
 717
 718 static void __exit hp_sdc_rtc_exit(void)
 719 {
 720         remove_proc_entry ("driver/rtc", NULL);
 721         misc_deregister(&hp_sdc_rtc_dev);
 722         hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
 723         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
 724 }
 725
 726 module_init(hp_sdc_rtc_init);
 727 module_exit(hp_sdc_rtc_exit);