drivers/input/misc/hp_sdc

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This source file includes following definitions.
hp_sdc_rtc_isr
hp_sdc_rtc_do_read_bbrtc
hp_sdc_rtc_read_bbrtc
hp_sdc_rtc_read_i8042timer
hp_sdc_rtc_read_rt
hp_sdc_rtc_read_fhs
hp_sdc_rtc_read_mt
hp_sdc_rtc_read_dt
hp_sdc_rtc_read_ct
hp_sdc_rtc_set_rt
hp_sdc_rtc_set_fhs
hp_sdc_rtc_set_i8042timer
hp_sdc_rtc_read
hp_sdc_rtc_poll
hp_sdc_rtc_open
hp_sdc_rtc_fasync
hp_sdc_rtc_proc_show
hp_sdc_rtc_ioctl
hp_sdc_rtc_unlocked_ioctl
hp_sdc_rtc_init
hp_sdc_rtc_exit
   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)) {
 184                 up(&i8042tregs);
 185                 return -1;
 186         }
 187         
 188         /* Sleep until results come back. */
 189         if (WARN_ON(down_interruptible(&i8042tregs)))
 190                 return -1;
 191 
 192         up(&i8042tregs);
 193 
 194         return (tseq[5] | 
 195                 ((uint64_t)(tseq[10]) << 8)  | ((uint64_t)(tseq[15]) << 16) |
 196                 ((uint64_t)(tseq[20]) << 24) | ((uint64_t)(tseq[25]) << 32));
 197 }
 198 
 199 
 200 /* Read the i8042 real-time clock */
 201 static inline int hp_sdc_rtc_read_rt(struct timespec64 *res) {
 202         int64_t raw;
 203         uint32_t tenms; 
 204         unsigned int days;
 205 
 206         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_RT, 5);
 207         if (raw < 0) return -1;
 208 
 209         tenms = (uint32_t)raw & 0xffffff;
 210         days  = (unsigned int)(raw >> 24) & 0xffff;
 211 
 212         res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
 213         res->tv_sec =  (tenms / 100) + (time64_t)days * 86400;
 214 
 215         return 0;
 216 }
 217 
 218 
 219 /* Read the i8042 fast handshake timer */
 220 static inline int hp_sdc_rtc_read_fhs(struct timespec64 *res) {
 221         int64_t raw;
 222         unsigned int tenms;
 223 
 224         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_FHS, 2);
 225         if (raw < 0) return -1;
 226 
 227         tenms = (unsigned int)raw & 0xffff;
 228 
 229         res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
 230         res->tv_sec  = (time64_t)(tenms / 100);
 231 
 232         return 0;
 233 }
 234 
 235 
 236 /* Read the i8042 match timer (a.k.a. alarm) */
 237 static inline int hp_sdc_rtc_read_mt(struct timespec64 *res) {
 238         int64_t raw;    
 239         uint32_t tenms; 
 240 
 241         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_MT, 3);
 242         if (raw < 0) return -1;
 243 
 244         tenms = (uint32_t)raw & 0xffffff;
 245 
 246         res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
 247         res->tv_sec  = (time64_t)(tenms / 100);
 248 
 249         return 0;
 250 }
 251 
 252 
 253 /* Read the i8042 delay timer */
 254 static inline int hp_sdc_rtc_read_dt(struct timespec64 *res) {
 255         int64_t raw;
 256         uint32_t tenms;
 257 
 258         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_DT, 3);
 259         if (raw < 0) return -1;
 260 
 261         tenms = (uint32_t)raw & 0xffffff;
 262 
 263         res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
 264         res->tv_sec  = (time64_t)(tenms / 100);
 265 
 266         return 0;
 267 }
 268 
 269 
 270 /* Read the i8042 cycle timer (a.k.a. periodic) */
 271 static inline int hp_sdc_rtc_read_ct(struct timespec64 *res) {
 272         int64_t raw;
 273         uint32_t tenms;
 274 
 275         raw = hp_sdc_rtc_read_i8042timer(HP_SDC_CMD_LOAD_CT, 3);
 276         if (raw < 0) return -1;
 277 
 278         tenms = (uint32_t)raw & 0xffffff;
 279 
 280         res->tv_nsec = (long)(tenms % 100) * 10000 * 1000;
 281         res->tv_sec  = (time64_t)(tenms / 100);
 282 
 283         return 0;
 284 }
 285 
 286 
 287 #if 0 /* not used yet */
 288 /* Set the i8042 real-time clock */
 289 static int hp_sdc_rtc_set_rt (struct timeval *setto)
 290 {
 291         uint32_t tenms;
 292         unsigned int days;
 293         hp_sdc_transaction t;
 294         uint8_t tseq[11] = {
 295                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 296                 HP_SDC_CMD_SET_RTMS, 3, 0, 0, 0,
 297                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 298                 HP_SDC_CMD_SET_RTD, 2, 0, 0 
 299         };
 300 
 301         t.endidx = 10;
 302 
 303         if (0xffff < setto->tv_sec / 86400) return -1;
 304         days = setto->tv_sec / 86400;
 305         if (0xffff < setto->tv_usec / 1000000 / 86400) return -1;
 306         days += ((setto->tv_sec % 86400) + setto->tv_usec / 1000000) / 86400;
 307         if (days > 0xffff) return -1;
 308 
 309         if (0xffffff < setto->tv_sec) return -1;
 310         tenms  = setto->tv_sec * 100;
 311         if (0xffffff < setto->tv_usec / 10000) return -1;
 312         tenms += setto->tv_usec / 10000;
 313         if (tenms > 0xffffff) return -1;
 314 
 315         tseq[3] = (uint8_t)(tenms & 0xff);
 316         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 317         tseq[5] = (uint8_t)((tenms >> 16) & 0xff);
 318 
 319         tseq[9] = (uint8_t)(days & 0xff);
 320         tseq[10] = (uint8_t)((days >> 8) & 0xff);
 321 
 322         t.seq = tseq;
 323 
 324         if (hp_sdc_enqueue_transaction(&t)) return -1;
 325         return 0;
 326 }
 327 
 328 /* Set the i8042 fast handshake timer */
 329 static int hp_sdc_rtc_set_fhs (struct timeval *setto)
 330 {
 331         uint32_t tenms;
 332         hp_sdc_transaction t;
 333         uint8_t tseq[5] = {
 334                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 335                 HP_SDC_CMD_SET_FHS, 2, 0, 0
 336         };
 337 
 338         t.endidx = 4;
 339 
 340         if (0xffff < setto->tv_sec) return -1;
 341         tenms  = setto->tv_sec * 100;
 342         if (0xffff < setto->tv_usec / 10000) return -1;
 343         tenms += setto->tv_usec / 10000;
 344         if (tenms > 0xffff) return -1;
 345 
 346         tseq[3] = (uint8_t)(tenms & 0xff);
 347         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 348 
 349         t.seq = tseq;
 350 
 351         if (hp_sdc_enqueue_transaction(&t)) return -1;
 352         return 0;
 353 }
 354 
 355 
 356 /* Set the i8042 match timer (a.k.a. alarm) */
 357 #define hp_sdc_rtc_set_mt (setto) \
 358         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_MT)
 359 
 360 /* Set the i8042 delay timer */
 361 #define hp_sdc_rtc_set_dt (setto) \
 362         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_DT)
 363 
 364 /* Set the i8042 cycle timer (a.k.a. periodic) */
 365 #define hp_sdc_rtc_set_ct (setto) \
 366         hp_sdc_rtc_set_i8042timer(setto, HP_SDC_CMD_SET_CT)
 367 
 368 /* Set one of the i8042 3-byte wide timers */
 369 static int hp_sdc_rtc_set_i8042timer (struct timeval *setto, uint8_t setcmd)
 370 {
 371         uint32_t tenms;
 372         hp_sdc_transaction t;
 373         uint8_t tseq[6] = {
 374                 HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT,
 375                 0, 3, 0, 0, 0
 376         };
 377 
 378         t.endidx = 6;
 379 
 380         if (0xffffff < setto->tv_sec) return -1;
 381         tenms  = setto->tv_sec * 100;
 382         if (0xffffff < setto->tv_usec / 10000) return -1;
 383         tenms += setto->tv_usec / 10000;
 384         if (tenms > 0xffffff) return -1;
 385 
 386         tseq[1] = setcmd;
 387         tseq[3] = (uint8_t)(tenms & 0xff);
 388         tseq[4] = (uint8_t)((tenms >> 8)  & 0xff);
 389         tseq[5] = (uint8_t)((tenms >> 16)  & 0xff);
 390 
 391         t.seq =                 tseq;
 392 
 393         if (hp_sdc_enqueue_transaction(&t)) { 
 394                 return -1;
 395         }
 396         return 0;
 397 }
 398 #endif
 399 
 400 static ssize_t hp_sdc_rtc_read(struct file *file, char __user *buf,
 401                                size_t count, loff_t *ppos) {
 402         ssize_t retval;
 403 
 404         if (count < sizeof(unsigned long))
 405                 return -EINVAL;
 406 
 407         retval = put_user(68, (unsigned long __user *)buf);
 408         return retval;
 409 }
 410 
 411 static __poll_t hp_sdc_rtc_poll(struct file *file, poll_table *wait)
 412 {
 413         unsigned long l;
 414 
 415         l = 0;
 416         if (l != 0)
 417                 return EPOLLIN | EPOLLRDNORM;
 418         return 0;
 419 }
 420 
 421 static int hp_sdc_rtc_open(struct inode *inode, struct file *file)
 422 {
 423         return 0;
 424 }
 425 
 426 static int hp_sdc_rtc_fasync (int fd, struct file *filp, int on)
 427 {
 428         return fasync_helper (fd, filp, on, &hp_sdc_rtc_async_queue);
 429 }
 430 
 431 static int hp_sdc_rtc_proc_show(struct seq_file *m, void *v)
 432 {
 433 #define YN(bit) ("no")
 434 #define NY(bit) ("yes")
 435         struct rtc_time tm;
 436         struct timespec64 tv;
 437 
 438         memset(&tm, 0, sizeof(struct rtc_time));
 439 
 440         if (hp_sdc_rtc_read_bbrtc(&tm)) {
 441                 seq_puts(m, "BBRTC\t\t: READ FAILED!\n");
 442         } else {
 443                 seq_printf(m,
 444                              "rtc_time\t: %ptRt\n"
 445                              "rtc_date\t: %ptRd\n"
 446                              "rtc_epoch\t: %04lu\n",
 447                              &tm, &tm, epoch);
 448         }
 449 
 450         if (hp_sdc_rtc_read_rt(&tv)) {
 451                 seq_puts(m, "i8042 rtc\t: READ FAILED!\n");
 452         } else {
 453                 seq_printf(m, "i8042 rtc\t: %lld.%02ld seconds\n",
 454                              (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
 455         }
 456 
 457         if (hp_sdc_rtc_read_fhs(&tv)) {
 458                 seq_puts(m, "handshake\t: READ FAILED!\n");
 459         } else {
 460                 seq_printf(m, "handshake\t: %lld.%02ld seconds\n",
 461                              (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
 462         }
 463 
 464         if (hp_sdc_rtc_read_mt(&tv)) {
 465                 seq_puts(m, "alarm\t\t: READ FAILED!\n");
 466         } else {
 467                 seq_printf(m, "alarm\t\t: %lld.%02ld seconds\n",
 468                              (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
 469         }
 470 
 471         if (hp_sdc_rtc_read_dt(&tv)) {
 472                 seq_puts(m, "delay\t\t: READ FAILED!\n");
 473         } else {
 474                 seq_printf(m, "delay\t\t: %lld.%02ld seconds\n",
 475                              (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
 476         }
 477 
 478         if (hp_sdc_rtc_read_ct(&tv)) {
 479                 seq_puts(m, "periodic\t: READ FAILED!\n");
 480         } else {
 481                 seq_printf(m, "periodic\t: %lld.%02ld seconds\n",
 482                              (s64)tv.tv_sec, (long)tv.tv_nsec/1000000L);
 483         }
 484 
 485         seq_printf(m,
 486                      "DST_enable\t: %s\n"
 487                      "BCD\t\t: %s\n"
 488                      "24hr\t\t: %s\n"
 489                      "square_wave\t: %s\n"
 490                      "alarm_IRQ\t: %s\n"
 491                      "update_IRQ\t: %s\n"
 492                      "periodic_IRQ\t: %s\n"
 493                      "periodic_freq\t: %ld\n"
 494                      "batt_status\t: %s\n",
 495                      YN(RTC_DST_EN),
 496                      NY(RTC_DM_BINARY),
 497                      YN(RTC_24H),
 498                      YN(RTC_SQWE),
 499                      YN(RTC_AIE),
 500                      YN(RTC_UIE),
 501                      YN(RTC_PIE),
 502                      1UL,
 503                      1 ? "okay" : "dead");
 504 
 505         return 0;
 506 #undef YN
 507 #undef NY
 508 }
 509 
 510 static int hp_sdc_rtc_ioctl(struct file *file, 
 511                             unsigned int cmd, unsigned long arg)
 512 {
 513 #if 1
 514         return -EINVAL;
 515 #else
 516         
 517         struct rtc_time wtime; 
 518         struct timeval ttime;
 519         int use_wtime = 0;
 520 
 521         /* This needs major work. */
 522 
 523         switch (cmd) {
 524 
 525         case RTC_AIE_OFF:       /* Mask alarm int. enab. bit    */
 526         case RTC_AIE_ON:        /* Allow alarm interrupts.      */
 527         case RTC_PIE_OFF:       /* Mask periodic int. enab. bit */
 528         case RTC_PIE_ON:        /* Allow periodic ints          */
 529         case RTC_UIE_ON:        /* Allow ints for RTC updates.  */
 530         case RTC_UIE_OFF:       /* Allow ints for RTC updates.  */
 531         {
 532                 /* We cannot mask individual user timers and we
 533                    cannot tell them apart when they occur, so it 
 534                    would be disingenuous to succeed these IOCTLs */
 535                 return -EINVAL;
 536         }
 537         case RTC_ALM_READ:      /* Read the present alarm time */
 538         {
 539                 if (hp_sdc_rtc_read_mt(&ttime)) return -EFAULT;
 540                 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
 541 
 542                 wtime.tm_hour = ttime.tv_sec / 3600;  ttime.tv_sec %= 3600;
 543                 wtime.tm_min  = ttime.tv_sec / 60;    ttime.tv_sec %= 60;
 544                 wtime.tm_sec  = ttime.tv_sec;
 545                 
 546                 break;
 547         }
 548         case RTC_IRQP_READ:     /* Read the periodic IRQ rate.  */
 549         {
 550                 return put_user(hp_sdc_rtc_freq, (unsigned long *)arg);
 551         }
 552         case RTC_IRQP_SET:      /* Set periodic IRQ rate.       */
 553         {
 554                 /* 
 555                  * The max we can do is 100Hz.
 556                  */
 557 
 558                 if ((arg < 1) || (arg > 100)) return -EINVAL;
 559                 ttime.tv_sec = 0;
 560                 ttime.tv_usec = 1000000 / arg;
 561                 if (hp_sdc_rtc_set_ct(&ttime)) return -EFAULT;
 562                 hp_sdc_rtc_freq = arg;
 563                 return 0;
 564         }
 565         case RTC_ALM_SET:       /* Store a time into the alarm */
 566         {
 567                 /*
 568                  * This expects a struct hp_sdc_rtc_time. Writing 0xff means
 569                  * "don't care" or "match all" for PC timers.  The HP SDC
 570                  * does not support that perk, but it could be emulated fairly
 571                  * easily.  Only the tm_hour, tm_min and tm_sec are used.
 572                  * We could do it with 10ms accuracy with the HP SDC, if the 
 573                  * rtc interface left us a way to do that.
 574                  */
 575                 struct hp_sdc_rtc_time alm_tm;
 576 
 577                 if (copy_from_user(&alm_tm, (struct hp_sdc_rtc_time*)arg,
 578                                    sizeof(struct hp_sdc_rtc_time)))
 579                        return -EFAULT;
 580 
 581                 if (alm_tm.tm_hour > 23) return -EINVAL;
 582                 if (alm_tm.tm_min  > 59) return -EINVAL;
 583                 if (alm_tm.tm_sec  > 59) return -EINVAL;  
 584 
 585                 ttime.sec = alm_tm.tm_hour * 3600 + 
 586                   alm_tm.tm_min * 60 + alm_tm.tm_sec;
 587                 ttime.usec = 0;
 588                 if (hp_sdc_rtc_set_mt(&ttime)) return -EFAULT;
 589                 return 0;
 590         }
 591         case RTC_RD_TIME:       /* Read the time/date from RTC  */
 592         {
 593                 if (hp_sdc_rtc_read_bbrtc(&wtime)) return -EFAULT;
 594                 break;
 595         }
 596         case RTC_SET_TIME:      /* Set the RTC */
 597         {
 598                 struct rtc_time hp_sdc_rtc_tm;
 599                 unsigned char mon, day, hrs, min, sec, leap_yr;
 600                 unsigned int yrs;
 601 
 602                 if (!capable(CAP_SYS_TIME))
 603                         return -EACCES;
 604                 if (copy_from_user(&hp_sdc_rtc_tm, (struct rtc_time *)arg,
 605                                    sizeof(struct rtc_time)))
 606                         return -EFAULT;
 607 
 608                 yrs = hp_sdc_rtc_tm.tm_year + 1900;
 609                 mon = hp_sdc_rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
 610                 day = hp_sdc_rtc_tm.tm_mday;
 611                 hrs = hp_sdc_rtc_tm.tm_hour;
 612                 min = hp_sdc_rtc_tm.tm_min;
 613                 sec = hp_sdc_rtc_tm.tm_sec;
 614 
 615                 if (yrs < 1970)
 616                         return -EINVAL;
 617 
 618                 leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
 619 
 620                 if ((mon > 12) || (day == 0))
 621                         return -EINVAL;
 622                 if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
 623                         return -EINVAL;
 624                 if ((hrs >= 24) || (min >= 60) || (sec >= 60))
 625                         return -EINVAL;
 626 
 627                 if ((yrs -= eH) > 255)    /* They are unsigned */
 628                         return -EINVAL;
 629 
 630 
 631                 return 0;
 632         }
 633         case RTC_EPOCH_READ:    /* Read the epoch.      */
 634         {
 635                 return put_user (epoch, (unsigned long *)arg);
 636         }
 637         case RTC_EPOCH_SET:     /* Set the epoch.       */
 638         {
 639                 /* 
 640                  * There were no RTC clocks before 1900.
 641                  */
 642                 if (arg < 1900)
 643                   return -EINVAL;
 644                 if (!capable(CAP_SYS_TIME))
 645                   return -EACCES;
 646                 
 647                 epoch = arg;
 648                 return 0;
 649         }
 650         default:
 651                 return -EINVAL;
 652         }
 653         return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
 654 #endif
 655 }
 656 
 657 static long hp_sdc_rtc_unlocked_ioctl(struct file *file,
 658                                       unsigned int cmd, unsigned long arg)
 659 {
 660         int ret;
 661 
 662         mutex_lock(&hp_sdc_rtc_mutex);
 663         ret = hp_sdc_rtc_ioctl(file, cmd, arg);
 664         mutex_unlock(&hp_sdc_rtc_mutex);
 665 
 666         return ret;
 667 }
 668 
 669 
 670 static const struct file_operations hp_sdc_rtc_fops = {
 671         .owner =                THIS_MODULE,
 672         .llseek =               no_llseek,
 673         .read =                 hp_sdc_rtc_read,
 674         .poll =                 hp_sdc_rtc_poll,
 675         .unlocked_ioctl =       hp_sdc_rtc_unlocked_ioctl,
 676         .open =                 hp_sdc_rtc_open,
 677         .fasync =               hp_sdc_rtc_fasync,
 678 };
 679 
 680 static struct miscdevice hp_sdc_rtc_dev = {
 681         .minor =        RTC_MINOR,
 682         .name =         "rtc_HIL",
 683         .fops =         &hp_sdc_rtc_fops
 684 };
 685 
 686 static int __init hp_sdc_rtc_init(void)
 687 {
 688         int ret;
 689 
 690 #ifdef __mc68000__
 691         if (!MACH_IS_HP300)
 692                 return -ENODEV;
 693 #endif
 694 
 695         sema_init(&i8042tregs, 1);
 696 
 697         if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr)))
 698                 return ret;
 699         if (misc_register(&hp_sdc_rtc_dev) != 0)
 700                 printk(KERN_INFO "Could not register misc. dev for i8042 rtc\n");
 701 
 702         proc_create_single("driver/rtc", 0, NULL, hp_sdc_rtc_proc_show);
 703 
 704         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support loaded "
 705                          "(RTC v " RTC_VERSION ")\n");
 706 
 707         return 0;
 708 }
 709 
 710 static void __exit hp_sdc_rtc_exit(void)
 711 {
 712         remove_proc_entry ("driver/rtc", NULL);
 713         misc_deregister(&hp_sdc_rtc_dev);
 714         hp_sdc_release_timer_irq(hp_sdc_rtc_isr);
 715         printk(KERN_INFO "HP i8042 SDC + MSM-58321 RTC support unloaded\n");
 716 }
 717 
 718 module_init(hp_sdc_rtc_init);
 719 module_exit(hp_sdc_rtc_exit);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/input/misc/hp_sdc_rtc.c

DEFINITIONS
