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/mutex.h>
  18 #include <linux/uaccess.h>
  19
  20 #include "platform.h"
  21 #include "di_defs.h"
  22 #include "divasync.h"
  23 #include "debug_if.h"
  24
  25 static DEFINE_MUTEX(maint_mutex);
  26 static char *main_revision = "$Revision: 1.32.6.10 $";
  27
  28 static int major;
  29
  30 MODULE_DESCRIPTION("Maint driver for Eicon DIVA Server cards");
  31 MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
  32 MODULE_SUPPORTED_DEVICE("DIVA card driver");
  33 MODULE_LICENSE("GPL");
  34
  35 static int buffer_length = 128;
  36 module_param(buffer_length, int, 0);
  37 static unsigned long diva_dbg_mem = 0;
  38 module_param(diva_dbg_mem, ulong, 0);
  39
  40 static char *DRIVERNAME =
  41         "Eicon DIVA - MAINT module (http://www.melware.net)";
  42 static char *DRIVERLNAME = "diva_mnt";
  43 static char *DEVNAME = "DivasMAINT";
  44 char *DRIVERRELEASE_MNT = "2.0";
  45
  46 static wait_queue_head_t msgwaitq;
  47 static unsigned long opened;
  48
  49 extern int mntfunc_init(int *, void **, unsigned long);
  50 extern void mntfunc_finit(void);
  51 extern int maint_read_write(void __user *buf, int count);
  52
  53 /*
  54  *  helper functions
  55  */
  56 static char *getrev(const char *revision)
  57 {
  58         char *rev;
  59         char *p;
  60
  61         if ((p = strchr(revision, ':'))) {
  62                 rev = p + 2;
  63                 p = strchr(rev, '$');
  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 timespec64 time;
  91
  92         ktime_get_ts64(&time);
  93
  94         *sec = (dword) time.tv_sec;
  95         *usec = (dword) (time.tv_nsec / NSEC_PER_USEC);
  96 }
  97
  98 /*
  99  * device node operations
 100  */
 101 static unsigned int maint_poll(struct file *file, poll_table *wait)
 102 {
 103         unsigned int mask = 0;
 104
 105         poll_wait(file, &msgwaitq, wait);
 106         mask = POLLOUT | POLLWRNORM;
 107         if (file->private_data || diva_dbg_q_length()) {
 108                 mask |= POLLIN | POLLRDNORM;
 109         }
 110         return (mask);
 111 }
 112
 113 static int maint_open(struct inode *ino, struct file *filep)
 114 {
 115         int ret;
 116
 117         mutex_lock(&maint_mutex);
 118         /* only one open is allowed, so we test
 119            it atomically */
 120         if (test_and_set_bit(0, &opened))
 121                 ret = -EBUSY;
 122         else {
 123                 filep->private_data = NULL;
 124                 ret = nonseekable_open(ino, filep);
 125         }
 126         mutex_unlock(&maint_mutex);
 127         return ret;
 128 }
 129
 130 static int maint_close(struct inode *ino, struct file *filep)
 131 {
 132         if (filep->private_data) {
 133                 diva_os_free(0, filep->private_data);
 134                 filep->private_data = NULL;
 135         }
 136
 137         /* clear 'used' flag */
 138         clear_bit(0, &opened);
 139
 140         return (0);
 141 }
 142
 143 static ssize_t divas_maint_write(struct file *file, const char __user *buf,
 144                                  size_t count, loff_t *ppos)
 145 {
 146         return (maint_read_write((char __user *) buf, (int) count));
 147 }
 148
 149 static ssize_t divas_maint_read(struct file *file, char __user *buf,
 150                                 size_t count, loff_t *ppos)
 151 {
 152         return (maint_read_write(buf, (int) count));
 153 }
 154
 155 static const struct file_operations divas_maint_fops = {
 156         .owner   = THIS_MODULE,
 157         .llseek  = no_llseek,
 158         .read    = divas_maint_read,
 159         .write   = divas_maint_write,
 160         .poll    = maint_poll,
 161         .open    = maint_open,
 162         .release = maint_close
 163 };
 164
 165 static void divas_maint_unregister_chrdev(void)
 166 {
 167         unregister_chrdev(major, DEVNAME);
 168 }
 169
 170 static int __init divas_maint_register_chrdev(void)
 171 {
 172         if ((major = register_chrdev(0, DEVNAME, &divas_maint_fops)) < 0)
 173         {
 174                 printk(KERN_ERR "%s: failed to create /dev entry.\n",
 175                        DRIVERLNAME);
 176                 return (0);
 177         }
 178
 179         return (1);
 180 }
 181
 182 /*
 183  * wake up reader
 184  */
 185 void diva_maint_wakeup_read(void)
 186 {
 187         wake_up_interruptible(&msgwaitq);
 188 }
 189
 190 /*
 191  *  Driver Load
 192  */
 193 static int __init maint_init(void)
 194 {
 195         char tmprev[50];
 196         int ret = 0;
 197         void *buffer = NULL;
 198
 199         init_waitqueue_head(&msgwaitq);
 200
 201         printk(KERN_INFO "%s\n", DRIVERNAME);
 202         printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_MNT);
 203         strcpy(tmprev, main_revision);
 204         printk("%s  Build: %s \n", getrev(tmprev), DIVA_BUILD);
 205
 206         if (!divas_maint_register_chrdev()) {
 207                 ret = -EIO;
 208                 goto out;
 209         }
 210
 211         if (!(mntfunc_init(&buffer_length, &buffer, diva_dbg_mem))) {
 212                 printk(KERN_ERR "%s: failed to connect to DIDD.\n",
 213                        DRIVERLNAME);
 214                 divas_maint_unregister_chrdev();
 215                 ret = -EIO;
 216                 goto out;
 217         }
 218
 219         printk(KERN_INFO "%s: trace buffer = %p - %d kBytes, %s (Major: %d)\n",
 220                DRIVERLNAME, buffer, (buffer_length / 1024),
 221                (diva_dbg_mem == 0) ? "internal" : "external", major);
 222
 223 out:
 224         return (ret);
 225 }
 226
 227 /*
 228 **  Driver Unload
 229 */
 230 static void __exit maint_exit(void)
 231 {
 232         divas_maint_unregister_chrdev();
 233         mntfunc_finit();
 234
 235         printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
 236 }
 237
 238 module_init(maint_init);
 239 module_exit(maint_exit);