drivers/isdn/hardware/eicon/divamnt.c

   1 /* $Id: divamnt.c,v 1.32.6.10 2005/02/11 19:40:25 armin Exp $
   2  *
   3  * Driver for Eicon DIVA Server ISDN cards.
   4  * Maint module
   5  *
   6  * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
   7  * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/poll.h>
  17 #include <linux/smp_lock.h>
  18 #include <asm/uaccess.h>
  19
  20 #include "platform.h"
  21 #include "di_defs.h"
  22 #include "divasync.h"
  23 #include "debug_if.h"
  24
  25 static char *main_revision = "$Revision: 1.32.6.10 $";
  26
  27 static int major;
  28
  29 MODULE_DESCRIPTION("Maint driver for Eicon DIVA Server cards");
  30 MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
  31 MODULE_SUPPORTED_DEVICE("DIVA card driver");
  32 MODULE_LICENSE("GPL");
  33
  34 static int buffer_length = 128;
  35 module_param(buffer_length, int, 0);
  36 static unsigned long diva_dbg_mem = 0;
  37 module_param(diva_dbg_mem, ulong, 0);
  38
  39 static char *DRIVERNAME =
  40     "Eicon DIVA - MAINT module (http://www.melware.net)";
  41 static char *DRIVERLNAME = "diva_mnt";
  42 static char *DEVNAME = "DivasMAINT";
  43 char *DRIVERRELEASE_MNT = "2.0";
  44
  45 static wait_queue_head_t msgwaitq;
  46 static unsigned long opened;
  47 static struct timeval start_time;
  48
  49 extern int mntfunc_init(int *, void **, unsigned long);
  50 extern void mntfunc_finit(void);
  51 extern int maint_read_write(void __user *buf, int count);
  52
  53 /*
  54  *  helper functions
  55  */
  56 static char *getrev(const char *revision)
  57 {
  58         char *rev;
  59         char *p;
  60
  61         if ((p = strchr(revision, ':'))) {
  62                 rev = p + 2;
  63                 p = strchr(rev, '$');
  64                 *--p = 0;
  65         } else
  66                 rev = "1.0";
  67
  68         return rev;
  69 }
  70
  71 /*
  72  * kernel/user space copy functions
  73  */
  74 int diva_os_copy_to_user(void *os_handle, void __user *dst, const void *src,
  75                          int length)
  76 {
  77         return (copy_to_user(dst, src, length));
  78 }
  79 int diva_os_copy_from_user(void *os_handle, void *dst, const void __user *src,
  80                            int length)
  81 {
  82         return (copy_from_user(dst, src, length));
  83 }
  84
  85 /*
  86  * get time
  87  */
  88 void diva_os_get_time(dword * sec, dword * usec)
  89 {
  90         struct timeval tv;
  91
  92         do_gettimeofday(&tv);
  93
  94         if (tv.tv_sec > start_time.tv_sec) {
  95                 if (start_time.tv_usec > tv.tv_usec) {
  96                         tv.tv_sec--;
  97                         tv.tv_usec += 1000000;
  98                 }
  99                 *sec = (dword) (tv.tv_sec - start_time.tv_sec);
 100                 *usec = (dword) (tv.tv_usec - start_time.tv_usec);
 101         } else if (tv.tv_sec == start_time.tv_sec) {
 102                 *sec = 0;
 103                 if (start_time.tv_usec < tv.tv_usec) {
 104                         *usec = (dword) (tv.tv_usec - start_time.tv_usec);
 105                 } else {
 106                         *usec = 0;
 107                 }
 108         } else {
 109                 *sec = (dword) tv.tv_sec;
 110                 *usec = (dword) tv.tv_usec;
 111         }
 112 }
 113
 114 /*
 115  * device node operations
 116  */
 117 static unsigned int maint_poll(struct file *file, poll_table * wait)
 118 {
 119         unsigned int mask = 0;
 120
 121         poll_wait(file, &msgwaitq, wait);
 122         mask = POLLOUT | POLLWRNORM;
 123         if (file->private_data || diva_dbg_q_length()) {
 124                 mask |= POLLIN | POLLRDNORM;
 125         }
 126         return (mask);
 127 }
 128
 129 static int maint_open(struct inode *ino, struct file *filep)
 130 {
 131         int ret;
 132
 133         lock_kernel();
 134         /* only one open is allowed, so we test
 135            it atomically */
 136         if (test_and_set_bit(0, &opened))
 137                 ret = -EBUSY;
 138         else {
 139                 filep->private_data = NULL;
 140                 ret = nonseekable_open(ino, filep);
 141         }
 142         unlock_kernel();
 143         return ret;
 144 }
 145
 146 static int maint_close(struct inode *ino, struct file *filep)
 147 {
 148         if (filep->private_data) {
 149                 diva_os_free(0, filep->private_data);
 150                 filep->private_data = NULL;
 151         }
 152
 153         /* clear 'used' flag */
 154         clear_bit(0, &opened);
 155
 156         return (0);
 157 }
 158
 159 static ssize_t divas_maint_write(struct file *file, const char __user *buf,
 160                                  size_t count, loff_t * ppos)
 161 {
 162         return (maint_read_write((char __user *) buf, (int) count));
 163 }
 164
 165 static ssize_t divas_maint_read(struct file *file, char __user *buf,
 166                                 size_t count, loff_t * ppos)
 167 {
 168         return (maint_read_write(buf, (int) count));
 169 }
 170
 171 static const struct file_operations divas_maint_fops = {
 172         .owner   = THIS_MODULE,
 173         .llseek  = no_llseek,
 174         .read    = divas_maint_read,
 175         .write   = divas_maint_write,
 176         .poll    = maint_poll,
 177         .open    = maint_open,
 178         .release = maint_close
 179 };
 180
 181 static void divas_maint_unregister_chrdev(void)
 182 {
 183         unregister_chrdev(major, DEVNAME);
 184 }
 185
 186 static int DIVA_INIT_FUNCTION divas_maint_register_chrdev(void)
 187 {
 188         if ((major = register_chrdev(0, DEVNAME, &divas_maint_fops)) < 0)
 189         {
 190                 printk(KERN_ERR "%s: failed to create /dev entry.\n",
 191                        DRIVERLNAME);
 192                 return (0);
 193         }
 194
 195         return (1);
 196 }
 197
 198 /*
 199  * wake up reader
 200  */
 201 void diva_maint_wakeup_read(void)
 202 {
 203         wake_up_interruptible(&msgwaitq);
 204 }
 205
 206 /*
 207  *  Driver Load
 208  */
 209 static int DIVA_INIT_FUNCTION maint_init(void)
 210 {
 211         char tmprev[50];
 212         int ret = 0;
 213         void *buffer = NULL;
 214
 215         do_gettimeofday(&start_time);
 216         init_waitqueue_head(&msgwaitq);
 217
 218         printk(KERN_INFO "%s\n", DRIVERNAME);
 219         printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_MNT);
 220         strcpy(tmprev, main_revision);
 221         printk("%s  Build: %s \n", getrev(tmprev), DIVA_BUILD);
 222
 223         if (!divas_maint_register_chrdev()) {
 224                 ret = -EIO;
 225                 goto out;
 226         }
 227
 228         if (!(mntfunc_init(&buffer_length, &buffer, diva_dbg_mem))) {
 229                 printk(KERN_ERR "%s: failed to connect to DIDD.\n",
 230                        DRIVERLNAME);
 231                 divas_maint_unregister_chrdev();
 232                 ret = -EIO;
 233                 goto out;
 234         }
 235
 236         printk(KERN_INFO "%s: trace buffer = %p - %d kBytes, %s (Major: %d)\n",
 237                DRIVERLNAME, buffer, (buffer_length / 1024),
 238                (diva_dbg_mem == 0) ? "internal" : "external", major);
 239
 240       out:
 241         return (ret);
 242 }
 243
 244 /*
 245 **  Driver Unload
 246 */
 247 static void DIVA_EXIT_FUNCTION maint_exit(void)
 248 {
 249         divas_maint_unregister_chrdev();
 250         mntfunc_finit();
 251
 252         printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
 253 }
 254
 255 module_init(maint_init);
 256 module_exit(maint_exit);
 257