aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/isdn/hardware/eicon/divamnt.c
blob: 70f16102a00109b8f60ccfda971752c3d6d1988d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/* $Id: divamnt.c,v 1.32.6.10 2005/02/11 19:40:25 armin Exp $
 *
 * Driver for Eicon DIVA Server ISDN cards.
 * Maint module
 *
 * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
 * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>

#include "platform.h"
#include "di_defs.h"
#include "divasync.h"
#include "debug_if.h"

static DEFINE_MUTEX(maint_mutex);
static char *main_revision = "$Revision: 1.32.6.10 $";

static int major;

MODULE_DESCRIPTION("Maint driver for Eicon DIVA Server cards");
MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
MODULE_SUPPORTED_DEVICE("DIVA card driver");
MODULE_LICENSE("GPL");

static int buffer_length = 128;
module_param(buffer_length, int, 0);
static unsigned long diva_dbg_mem = 0;
module_param(diva_dbg_mem, ulong, 0);

static char *DRIVERNAME =
	"Eicon DIVA - MAINT module (http://www.melware.net)";
static char *DRIVERLNAME = "diva_mnt";
static char *DEVNAME = "DivasMAINT";
char *DRIVERRELEASE_MNT = "2.0";

static wait_queue_head_t msgwaitq;
static unsigned long opened;

extern int mntfunc_init(int *, void **, unsigned long);
extern void mntfunc_finit(void);
extern int maint_read_write(void __user *buf, int count);

/*
 *  helper functions
 */
static char *getrev(const char *revision)
{
	char *rev;
	char *p;

	if ((p = strchr(revision, ':'))) {
		rev = p + 2;
		p = strchr(rev, '$');
		*--p = 0;
	} else
		rev = "1.0";

	return rev;
}

/*
 * kernel/user space copy functions
 */
int diva_os_copy_to_user(void *os_handle, void __user *dst, const void *src,
			 int length)
{
	return (copy_to_user(dst, src, length));
}
int diva_os_copy_from_user(void *os_handle, void *dst, const void __user *src,
			   int length)
{
	return (copy_from_user(dst, src, length));
}

/*
 * get time
 */
void diva_os_get_time(dword *sec, dword *usec)
{
	struct timespec64 time;

	ktime_get_ts64(&time);

	*sec = (dword) time.tv_sec;
	*usec = (dword) (time.tv_nsec / NSEC_PER_USEC);
}

/*
 * device node operations
 */
static __poll_t maint_poll(struct file *file, poll_table *wait)
{
	__poll_t mask = 0;

	poll_wait(file, &msgwaitq, wait);
	mask = POLLOUT | POLLWRNORM;
	if (file->private_data || diva_dbg_q_length()) {
		mask |= POLLIN | POLLRDNORM;
	}
	return (mask);
}

static int maint_open(struct inode *ino, struct file *filep)
{
	int ret;

	mutex_lock(&maint_mutex);
	/* only one open is allowed, so we test
	   it atomically */
	if (test_and_set_bit(0, &opened))
		ret = -EBUSY;
	else {
		filep->private_data = NULL;
		ret = nonseekable_open(ino, filep);
	}
	mutex_unlock(&maint_mutex);
	return ret;
}

static int maint_close(struct inode *ino, struct file *filep)
{
	if (filep->private_data) {
		diva_os_free(0, filep->private_data);
		filep->private_data = NULL;
	}

	/* clear 'used' flag */
	clear_bit(0, &opened);

	return (0);
}

static ssize_t divas_maint_write(struct file *file, const char __user *buf,
				 size_t count, loff_t *ppos)
{
	return (maint_read_write((char __user *) buf, (int) count));
}

static ssize_t divas_maint_read(struct file *file, char __user *buf,
				size_t count, loff_t *ppos)
{
	return (maint_read_write(buf, (int) count));
}

static const struct file_operations divas_maint_fops = {
	.owner   = THIS_MODULE,
	.llseek  = no_llseek,
	.read    = divas_maint_read,
	.write   = divas_maint_write,
	.poll    = maint_poll,
	.open    = maint_open,
	.release = maint_close
};

static void divas_maint_unregister_chrdev(void)
{
	unregister_chrdev(major, DEVNAME);
}

static int __init divas_maint_register_chrdev(void)
{
	if ((major = register_chrdev(0, DEVNAME, &divas_maint_fops)) < 0)
	{
		printk(KERN_ERR "%s: failed to create /dev entry.\n",
		       DRIVERLNAME);
		return (0);
	}

	return (1);
}

/*
 * wake up reader
 */
void diva_maint_wakeup_read(void)
{
	wake_up_interruptible(&msgwaitq);
}

/*
 *  Driver Load
 */
static int __init maint_init(void)
{
	char tmprev[50];
	int ret = 0;
	void *buffer = NULL;

	init_waitqueue_head(&msgwaitq);

	printk(KERN_INFO "%s\n", DRIVERNAME);
	printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_MNT);
	strcpy(tmprev, main_revision);
	printk("%s  Build: %s \n", getrev(tmprev), DIVA_BUILD);

	if (!divas_maint_register_chrdev()) {
		ret = -EIO;
		goto out;
	}

	if (!(mntfunc_init(&buffer_length, &buffer, diva_dbg_mem))) {
		printk(KERN_ERR "%s: failed to connect to DIDD.\n",
		       DRIVERLNAME);
		divas_maint_unregister_chrdev();
		ret = -EIO;
		goto out;
	}

	printk(KERN_INFO "%s: trace buffer = %p - %d kBytes, %s (Major: %d)\n",
	       DRIVERLNAME, buffer, (buffer_length / 1024),
	       (diva_dbg_mem == 0) ? "internal" : "external", major);

out:
	return (ret);
}

/*
**  Driver Unload
*/
static void __exit maint_exit(void)
{
	divas_maint_unregister_chrdev();
	mntfunc_finit();

	printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
}

module_init(maint_init);
module_exit(maint_exit);

Privacy Policy