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/seq_file.h>
  45 #include <linux/poll.h>
  46 #include <linux/rtc.h>
  47 #include <linux/mutex.h>
  48 #include <linux/semaphore.h>
  49
  50 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
  51 MODULE_DESCRIPTION("HP i8042 SDC + MSM-58321 RTC Driver");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53
  54 #define RTC_VERSION "1.10d"
  55
  56 static DEFINE_MUTEX(hp_sdc_rtc_mutex);
  57 static unsigned long epoch = 2000;
  58
  59 static struct semaphore i8042tregs;
  60
  61 static hp_sdc_irqhook hp_sdc_rtc_isr;
  62
  63 static struct fasync_struct *hp_sdc_rtc_async_queue;
  64
  65 static DECLARE_WAIT_QUEUE_HEAD(hp_sdc_rtc_wait);
  66
  67 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
  68                                size_t count, loff_t *ppos);
  69
  70 static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
  71                                       unsigned int cmd, unsigned long arg);
  72
  73 static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait);
  74
  75 static int hp_sdc_rtc_open(struct inode *inode, struct file *file);
  76 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on);
  77
  78 static void hp_sdc_rtc_isr (int irq, void *dev_id,
  79                             uint8_t status, uint8_t data)
  80 {
  81         return;
  82 }
  83
  84 static 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         sema_init(&tsem, 0);
 107
 108         if (hp_sdc_enqueue_transaction(&t)) return -1;
 109
 110         /* Put ourselves to sleep for results. */
 111         if (WARN_ON(down_interruptible(&tsem)))
 112                 return -1;
 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         /* Sleep if output regs in use. */
 180         if (WARN_ON(down_interruptible(&i8042tregs)))
 181                 return -1;
 182
 183         if (hp_sdc_enqueue_transaction(&t)) return -1;
 184
 185         /* Sleep until results come back. */
 186         if (WARN_ON(down_interruptible(&i8042tregs)))
 187                 return -1;
 188
 189         up(&i8042tregs);
 190
 191         return (tseq[5] |
 192                 ((uint64_t)(tseq[10]) << 8)  | ((uint64_t)(tseq[15]) << 16) |
 193                 ((uint64_t)(tseq[20]) << 24) | ((uint64_t)(tseq[25]) << 32));
 194 }
 195
 196
 197 /* Read the i8042 real-time clock */
 198 static inline int hp_sdc_rtc_read_rt(struct timeval *res) {
 199         int64_t raw;
 200         uint32_t tenms;
 201         unsigned int days;
 202
 203         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5);
 204         if (raw < 0) return -1;
 205
 206         tenms = (uint32_t)raw & 0xffffff;
 207         days  = (unsigned int)(raw >> 24) & 0xffff;
 208
 209         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 210         res->tv_sec =  (time_t)(tenms / 100) + days * 86400;
 211
 212         return 0;
 213 }
 214
 215
 216 /* Read the i8042 fast handshake timer */
 217 static inline int hp_sdc_rtc_read_fhs(struct timeval *res) {
 218         int64_t raw;
 219         unsigned int tenms;
 220
 221         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
 222         if (raw < 0) return -1;
 223
 224         tenms = (unsigned int)raw & 0xffff;
 225
 226         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 227         res->tv_sec  = (time_t)(tenms / 100);
 228
 229         return 0;
 230 }
 231
 232
 233 /* Read the i8042 match timer (a.k.a. alarm) */
 234 static inline int hp_sdc_rtc_read_mt(struct timeval *res) {
 235         int64_t raw;
 236         uint32_t tenms;
 237
 238         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
 239         if (raw < 0) return -1;
 240
 241         tenms = (uint32_t)raw & 0xffffff;
 242
 243         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 244         res->tv_sec  = (time_t)(tenms / 100);
 245
 246         return 0;
 247 }
 248
 249
 250 /* Read the i8042 delay timer */
 251 static inline int hp_sdc_rtc_read_dt(struct timeval *res) {
 252         int64_t raw;
 253         uint32_t tenms;
 254
 255         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
 256         if (raw < 0) return -1;
 257
 258         tenms = (uint32_t)raw & 0xffffff;
 259
 260         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 261         res->tv_sec  = (time_t)(tenms / 100);
 262
 263         return 0;
 264 }
 265
 266
 267 /* Read the i8042 cycle timer (a.k.a. periodic) */
 268 static inline int hp_sdc_rtc_read_ct(struct timeval *res) {
 269         int64_t raw;
 270         uint32_t tenms;
 271
 272         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
 273         if (raw < 0) return -1;
 274
 275         tenms = (uint32_t)raw & 0xffffff;
 276
 277         res->tv_usec = (suseconds_t)(tenms % 100) * 10000;
 278         res->tv_sec  = (time_t)(tenms / 100);
 279
 280         return 0;
 281 }
 282
 283
 284 #if 0 /* not used yet */
 285 /* Set the i8042 real-time clock */
 286 static int hp_sdc_rtc_set_rt (struct timeval *setto)
 287 {
 288         uint32_t tenms;
 289         unsigned int days;
 290         hp_sdc_transaction t;
 291         uint8_t tseq[11] = {
 292                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 293                 HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0,
 294                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 295                 HP_SDC_CMD_SET_RTD, 2, 0, 0
 296         };
 297
 298         t.endidx = 10;
 299
 300         if (0xffff < setto->tv_sec / 86400) return -1;
 301         days = setto->tv_sec / 86400;
 302         if (0xffff < setto->tv_usec / 1000000 / 86400) return -1;
 303         days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400;
 304         if (days > 0xffff) return -1;
 305
 306         if (0xffffff < setto->tv_sec) return -1;
 307         tenms  = setto->tv_sec * 100;
 308         if (0xffffff < setto->tv_usec / 10000) return -1;
 309         tenms += setto->tv_usec / 10000;
 310         if (tenms > 0xffffff) return -1;
 311
 312         tseq[3] = (uint8_t)(tenms & 0xff);
 313         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 314         tseq[5] = (uint8_t)((tenms >> 16) & 0xff);
 315
 316         tseq[9] = (uint8_t)(days & 0xff);
 317         tseq[10] = (uint8_t)((days >> 8) & 0xff);
 318
 319         t.seq = tseq;
 320
 321         if (hp_sdc_enqueue_transaction(&t)) return -1;
 322         return 0;
 323 }
 324
 325 /* Set the i8042 fast handshake timer */
 326 static int hp_sdc_rtc_set_fhs (struct timeval *setto)
 327 {
 328         uint32_t tenms;
 329         hp_sdc_transaction t;
 330         uint8_t tseq[5] = {
 331                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 332                 HP_SDC_CMD_SET_FHS, 2, 0, 0
 333         };
 334
 335         t.endidx = 4;
 336
 337         if (0xffff < setto->tv_sec) return -1;
 338         tenms  = setto->tv_sec * 100;
 339         if (0xffff < setto->tv_usec / 10000) return -1;
 340         tenms += setto->tv_usec / 10000;
 341         if (tenms > 0xffff) return -1;
 342
 343         tseq[3] = (uint8_t)(tenms & 0xff);
 344         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 345
 346         t.seq = tseq;
 347
 348         if (hp_sdc_enqueue_transaction(&t)) return -1;
 349         return 0;
 350 }
 351
 352
 353 /* Set the i8042 match timer (a.k.a. alarm) */
 354 #define hp_sdc_rtc_set_mt (setto) \
 355         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT)
 356
 357 /* Set the i8042 delay timer */
 358 #define hp_sdc_rtc_set_dt (setto) \
 359         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT)
 360
 361 /* Set the i8042 cycle timer (a.k.a. periodic) */
 362 #define hp_sdc_rtc_set_ct (setto) \
 363         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT)
 364
 365 /* Set one of the i8042 3-byte wide timers */
 366 static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
 367 {
 368         uint32_t tenms;
 369         hp_sdc_transaction t;
 370         uint8_t tseq[6] = {
 371                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 372                 0, 3, 0, 0, 0
 373         };
 374
 375         t.endidx = 6;
 376
 377         if (0xffffff < setto->tv_sec) return -1;
 378         tenms  = setto->tv_sec * 100;
 379         if (0xffffff < setto->tv_usec / 10000) return -1;
 380         tenms += setto->tv_usec / 10000;
 381         if (tenms > 0xffffff) return -1;
 382
 383         tseq[1] = setcmd;
 384         tseq[3] = (uint8_t)(tenms & 0xff);
 385         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 386         tseq[5] = (uint8_t)((tenms >> 16)  & 0xff);
 387
 388         t.seq =                 tseq;
 389
 390         if (hp_sdc_enqueue_transaction(&t)) {
 391                 return -1;
 392         }
 393         return 0;
 394 }
 395 #endif
 396
 397 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
 398                                size_t count, loff_t *ppos) {
 399         ssize_t retval;
 400
 401         if (count < sizeof(unsigned long))
 402                 return -EINVAL;
 403
 404         retval = put_user(68, (unsigned long __user *)buf);
 405         return retval;
 406 }
 407
 408 static unsigned int hp_sdc_rtc_poll(struct file *file, poll_table *wait)
 409 {
 410         unsigned long l;
 411
 412         l = 0;
 413         if (l != 0)
 414                 return POLLIN | POLLRDNORM;
 415         return 0;
 416 }
 417
 418 static int hp_sdc_rtc_open(struct inode *inode, struct file *file)
 419 {
 420         return 0;
 421 }
 422
 423 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
 424 {
 425         return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
 426 }
 427
 428 static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
 429 {
 430 #define YN(bit) ("no")
 431 #define NY(bit) ("yes")
 432         struct rtc_time tm;
 433         struct timeval tv;
 434
 435         memset(&tm, 0, sizeof(struct rtc_time));
 436
 437         if (hp_sdc_rtc_read_bbrtc(&tm)) {
 438                 seq_puts(m, "BBRTC\t\t: READ FAILED!\n");
 439         } else {
 440                 seq_printf(m,
 441                              "rtc_time\t: %02d:%02d:%02d\n"
 442                              "rtc_date\t: %04d-%02d-%02d\n"
 443                              "rtc_epoch\t: %04lu\n",
 444                              tm.tm_hour, tm.tm_min, tm.tm_sec,
 445                              tm.tm_year + 1900, tm.tm_mon + 1,
 446                              tm.tm_mday, epoch);
 447         }
 448
 449         if (hp_sdc_rtc_read_rt(&tv)) {
 450                 seq_puts(m, "i8042 rtc\t: READ FAILED!\n");
 451         } else {
 452                 seq_printf(m, "i8042 rtc\t: %ld.%02d seconds\n",
 453                              tv.tv_sec, (int)tv.tv_usec/1000);
 454         }
 455
 456         if (hp_sdc_rtc_read_fhs(&tv)) {
 457                 seq_puts(m, "handshake\t: READ FAILED!\n");
 458         } else {
 459                 seq_printf(m, "handshake\t: %ld.%02d seconds\n",
 460                              tv.tv_sec, (int)tv.tv_usec/1000);
 461         }
 462
 463         if (hp_sdc_rtc_read_mt(&tv)) {
 464                 seq_puts(m, "alarm\t\t: READ FAILED!\n");
 465         } else {
 466                 seq_printf(m, "alarm\t\t: %ld.%02d seconds\n",
 467                              tv.tv_sec, (int)tv.tv_usec/1000);
 468         }
 469
 470         if (hp_sdc_rtc_read_dt(&tv)) {
 471                 seq_puts(m, "delay\t\t: READ FAILED!\n");
 472         } else {
 473                 seq_printf(m, "delay\t\t: %ld.%02d seconds\n",
 474                              tv.tv_sec, (int)tv.tv_usec/1000);
 475         }
 476
 477         if (hp_sdc_rtc_read_ct(&tv)) {
 478                 seq_puts(m, "periodic\t: READ FAILED!\n");
 479         } else {
 480                 seq_printf(m, "periodic\t: %ld.%02d seconds\n",
 481                              tv.tv_sec, (int)tv.tv_usec/1000);
 482         }
 483
 484         seq_printf(m,
 485                      "DST_enable\t: %s\n"
 486                      "BCD\t\t: %s\n"
 487                      "24hr\t\t: %s\n"
 488                      "square_wave\t: %s\n"
 489                      "alarm_IRQ\t: %s\n"
 490                      "update_IRQ\t: %s\n"
 491                      "periodic_IRQ\t: %s\n"
 492                      "periodic_freq\t: %ld\n"
 493                      "batt_status\t: %s\n",
 494                      YN(RTC_DST_EN),
 495                      NY(RTC_DM_BINARY),
 496                      YN(RTC_24H),
 497                      YN(RTC_SQWE),
 498                      YN(RTC_AIE),
 499                      YN(RTC_UIE),
 500                      YN(RTC_PIE),
 501                      1UL,
 502                      1 ? "okay" : "dead");
 503
 504         return 0;
 505 #undef YN
 506 #undef NY
 507 }
 508
 509 static int hp_sdc_rtc_proc_open(struct inode *inode, struct file *file)
 510 {
 511         return single_open(file, hp_sdc_rtc_proc_show, NULL);
 512 }
 513
 514 static const struct file_operations hp_sdc_rtc_proc_fops = {
 515         .open           = hp_sdc_rtc_proc_open,
 516         .read           = seq_read,
 517         .llseek         = seq_lseek,
 518         .release        = single_release,
 519 };
 520
 521 static int hp_sdc_rtc_ioctl(struct file *file,
 522                             unsigned int cmd, unsigned long arg)
 523 {
 524 #if 1
 525         return -EINVAL;
 526 #else
 527
 528         struct rtc_time wtime;
 529         struct timeval ttime;
 530         int use_wtime = 0;
 531
 532         /* This needs major work. */
 533
 534         switch (cmd) {
 535
 536         case RTC_AIE_OFF:       /* Mask alarm int. enab. bit    */
 537         case RTC_AIE_ON:        /* Allow alarm interrupts.      */
 538         case RTC_PIE_OFF:       /* Mask periodic int. enab. bit */
 539         case RTC_PIE_ON:        /* Allow periodic ints          */
 540         case RTC_UIE_ON:        /* Allow ints for RTC updates.  */
 541         case RTC_UIE_OFF:       /* Allow ints for RTC updates.  */
 542         {
 543                 /* We cannot mask individual user timers and we
 544                    cannot tell them apart when they occur, so it
 545                    would be disingenuous to succeed these IOCTLs */
 546                 return -EINVAL;
 547         }
 548         case RTC_ALM_READ:      /* Read the present alarm time */
 549         {
 550                 if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT;
 551                 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
 552
 553                 wtime.tm_hour = ttime.tv_sec / 3600;  ttime.tv_sec %= 3600;
 554                 wtime.tm_min  = ttime.tv_sec / 60;    ttime.tv_sec %= 60;
 555                 wtime.tm_sec  = ttime.tv_sec;
 556
 557                 break;
 558         }
 559         case RTC_IRQP_READ:     /* Read the periodic IRQ rate.  */
 560         {
 561                 return put_user(hp_sdc_rtc_freq, (unsigned long *)arg);
 562         }
 563         case RTC_IRQP_SET:      /* Set periodic IRQ rate.       */
 564         {
 565                 /*
 566                  * The max we can do is 100Hz.
 567                  */
 568
 569                 if ((arg < 1) || (arg > 100)) return -EINVAL;
 570                 ttime.tv_sec = 0;
 571                 ttime.tv_usec = 1000000 / arg;
 572                 if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT;
 573                 hp_sdc_rtc_freq = arg;
 574                 return 0;
 575         }
 576         case RTC_ALM_SET:       /* Store a time into the alarm */
 577         {
 578                 /*
 579                  * This expects a struct hp_sdc_rtc_time. Writing 0xff means
 580                  * "don't care" or "match all" for PC timers.  The HP SDC
 581                  * does not support that perk, but it could be emulated fairly
 582                  * easily.  Only the tm_hour, tm_min and tm_sec are used.
 583                  * We could do it with 10ms accuracy with the HP SDC, if the
 584                  * rtc interface left us a way to do that.
 585                  */
 586                 struct hp_sdc_rtc_time alm_tm;
 587
 588                 if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg,
 589                                    sizeof(struct hp_sdc_rtc_time)))
 590                        return -EFAULT;
 591
 592                 if (alm_tm.tm_hour > 23) return -EINVAL;
 593                 if (alm_tm.tm_min  > 59) return -EINVAL;
 594                 if (alm_tm.tm_sec  > 59) return -EINVAL;
 595
 596                 ttime.sec = alm_tm.tm_hour * 3600 +
 597                   alm_tm.tm_min * 60 + alm_tm.tm_sec;
 598                 ttime.usec = 0;
 599                 if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT;
 600                 return 0;
 601         }
 602         case RTC_RD_TIME:       /* Read the time/date from RTC  */
 603         {
 604                 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
 605                 break;
 606         }
 607         case RTC_SET_TIME:      /* Set the RTC */
 608         {
 609                 struct rtc_time hp_sdc_rtc_tm;
 610                 unsigned char mon, day, hrs, min, sec, leap_yr;
 611                 unsigned int yrs;
 612
 613                 if (!capable(CAP_SYS_TIME))
 614                         return -EACCES;
 615                 if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg,
 616                                    sizeof(struct rtc_time)))
 617                         return -EFAULT;
 618
 619                 yrs = hp_sdc_rtc_tm.tm_year + 1900;
 620                 mon = hp_sdc_rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
 621                 day = hp_sdc_rtc_tm.tm_mday;
 622                 hrs = hp_sdc_rtc_tm.tm_hour;
 623                 min = hp_sdc_rtc_tm.tm_min;
 624                 sec = hp_sdc_rtc_tm.tm_sec;
 625
 626                 if (yrs < 1970)
 627                         return -EINVAL;
 628
 629                 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
 630
 631                 if ((mon > 12) || (day == 0))
 632                         return -EINVAL;
 633                 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
 634                         return -EINVAL;
 635                 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
 636                         return -EINVAL;
 637
 638                 if ((yrs -= eH) > 255)    /* They are unsigned */
 639                         return -EINVAL;
 640
 641
 642                 return 0;
 643         }
 644         case RTC_EPOCH_READ:    /* Read the epoch.      */
 645         {
 646                 return put_user (epoch, (unsigned long *)arg);
 647         }
 648         case RTC_EPOCH_SET:     /* Set the epoch.       */
 649         {
 650                 /*
 651                  * There were no RTC clocks before 1900.
 652                  */
 653                 if (arg < 1900)
 654                   return -EINVAL;
 655                 if (!capable(CAP_SYS_TIME))
 656                   return -EACCES;
 657
 658                 epoch = arg;
 659                 return 0;
 660         }
 661         default:
 662                 return -EINVAL;
 663         }
 664         return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
 665 #endif
 666 }
 667
 668 static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
 669                                       unsigned int cmd, unsigned long arg)
 670 {
 671         int ret;
 672
 673         mutex_lock(&hp_sdc_rtc_mutex);
 674         ret = hp_sdc_rtc_ioctl(file, cmd, arg);
 675         mutex_unlock(&hp_sdc_rtc_mutex);
 676
 677         return ret;
 678 }
 679
 680
 681 static const struct file_operations hp_sdc_rtc_fops = {
 682         .owner =                THIS_MODULE,
 683         .llseek =               no_llseek,
 684         .read =                 hp_sdc_rtc_read,
 685         .poll =                 hp_sdc_rtc_poll,
 686         .unlocked_ioctl =       hp_sdc_rtc_unlocked_ioctl,
 687         .open =                 hp_sdc_rtc_open,
 688         .fasync =               hp_sdc_rtc_fasync,
 689 };
 690
 691 static struct miscdevice hp_sdc_rtc_dev = {
 692         .minor =        RTC_MINOR,
 693         .name =         "rtc_HIL",
 694         .fops =         &hp_sdc_rtc_fops
 695 };
 696
 697 static int __init hp_sdc_rtc_init(void)
 698 {
 699         int ret;
 700
 701 #ifdef __mc68000__
 702         if (!MACH_IS_HP300)
 703                 return -ENODEV;
 704 #endif
 705
 706         sema_init(&i8042tregs, 1);
 707
 708         if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
 709                 return ret;
 710         if (misc_register(&hp_sdc_rtc_dev) != 0)
 711                 printk(KERN_INFO "Could not register misc. dev for i8042 rtc\n");
 712
 713         proc_create("driver/rtc", 0, NULL, &hp_sdc_rtc_proc_fops);
 714
 715         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
 716                          "(RTC v " RTC_VERSION ")\n");
 717
 718         return 0;
 719 }
 720
 721 static void __exit hp_sdc_rtc_exit(void)
 722 {
 723         remove_proc_entry ("driver/rtc", NULL);
 724         misc_deregister(&hp_sdc_rtc_dev);
 725         hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
 726         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
 727 }
 728
 729 module_init(hp_sdc_rtc_init);
 730 module_exit(hp_sdc_rtc_exit);