linux/drivers/isdn/hardware/eicon/divamnt.c
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   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
  25static DEFINE_MUTEX(maint_mutex);
  26static char *main_revision = "$Revision: 1.32.6.10 $";
  27
  28static int major;
  29
  30MODULE_DESCRIPTION("Maint driver for Eicon DIVA Server cards");
  31MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
  32MODULE_SUPPORTED_DEVICE("DIVA card driver");
  33MODULE_LICENSE("GPL");
  34
  35static int buffer_length = 128;
  36module_param(buffer_length, int, 0);
  37static unsigned long diva_dbg_mem = 0;
  38module_param(diva_dbg_mem, ulong, 0);
  39
  40static char *DRIVERNAME =
  41        "Eicon DIVA - MAINT module (http://www.melware.net)";
  42static char *DRIVERLNAME = "diva_mnt";
  43static char *DEVNAME = "DivasMAINT";
  44char *DRIVERRELEASE_MNT = "2.0";
  45
  46static wait_queue_head_t msgwaitq;
  47static unsigned long opened;
  48
  49extern int mntfunc_init(int *, void **, unsigned long);
  50extern void mntfunc_finit(void);
  51extern int maint_read_write(void __user *buf, int count);
  52
  53/*
  54 *  helper functions
  55 */
  56static char *getrev(const char *revision)
  57{
  58        char *rev;
  59        char *p;
  60
  61        if ((p = strchr(revision, ':'))) {
  62                rev = p + 2;
  63                p = strchr(rev, '$');
  64                *--p = 0;
  65        } else
  66                rev = "1.0";
  67
  68        return rev;
  69}
  70
  71/*
  72 * kernel/user space copy functions
  73 */
  74int 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}
  79int 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 */
  88void 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 */
 101static 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
 113static 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
 130static 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
 143static 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
 149static 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
 155static 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
 165static void divas_maint_unregister_chrdev(void)
 166{
 167        unregister_chrdev(major, DEVNAME);
 168}
 169
 170static 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 */
 185void diva_maint_wakeup_read(void)
 186{
 187        wake_up_interruptible(&msgwaitq);
 188}
 189
 190/*
 191 *  Driver Load
 192 */
 193static 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
 223out:
 224        return (ret);
 225}
 226
 227/*
 228**  Driver Unload
 229*/
 230static 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
 238module_init(maint_init);
 239module_exit(maint_exit);
 240