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 <asm/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 $";
27
28static int major;
29
30MODULE_DESCRIPTION("Maint driver for Eicon DIVA Server cards");
31MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
32MODULE_SUPPORTED_DEVICE("DIVA card driver");
33MODULE_LICENSE("GPL");
34
35static int buffer_length = 128;
36module_param(buffer_length, int, 0);
37static unsigned long diva_dbg_mem = 0;
38module_param(diva_dbg_mem, ulong, 0);
39
40static char *DRIVERNAME =
41	"Eicon DIVA - MAINT module (http://www.melware.net)";
42static char *DRIVERLNAME = "diva_mnt";
43static char *DEVNAME = "DivasMAINT";
44char *DRIVERRELEASE_MNT = "2.0";
45
46static wait_queue_head_t msgwaitq;
47static unsigned long opened;
48static struct timeval start_time;
49
50extern int mntfunc_init(int *, void **, unsigned long);
51extern void mntfunc_finit(void);
52extern int maint_read_write(void __user *buf, int count);
53
54/*
55 *  helper functions
56 */
57static char *getrev(const char *revision)
58{
59	char *rev;
60	char *p;
61
62	if ((p = strchr(revision, ':'))) {
63		rev = p + 2;
64		p = strchr(rev, '$');
65		*--p = 0;
66	} else
67		rev = "1.0";
68
69	return rev;
70}
71
72/*
73 * kernel/user space copy functions
74 */
75int diva_os_copy_to_user(void *os_handle, void __user *dst, const void *src,
76			 int length)
77{
78	return (copy_to_user(dst, src, length));
79}
80int diva_os_copy_from_user(void *os_handle, void *dst, const void __user *src,
81			   int length)
82{
83	return (copy_from_user(dst, src, length));
84}
85
86/*
87 * get time
88 */
89void diva_os_get_time(dword *sec, dword *usec)
90{
91	struct timeval tv;
92
93	do_gettimeofday(&tv);
94
95	if (tv.tv_sec > start_time.tv_sec) {
96		if (start_time.tv_usec > tv.tv_usec) {
97			tv.tv_sec--;
98			tv.tv_usec += 1000000;
99		}
100		*sec = (dword) (tv.tv_sec - start_time.tv_sec);
101		*usec = (dword) (tv.tv_usec - start_time.tv_usec);
102	} else if (tv.tv_sec == start_time.tv_sec) {
103		*sec = 0;
104		if (start_time.tv_usec < tv.tv_usec) {
105			*usec = (dword) (tv.tv_usec - start_time.tv_usec);
106		} else {
107			*usec = 0;
108		}
109	} else {
110		*sec = (dword) tv.tv_sec;
111		*usec = (dword) tv.tv_usec;
112	}
113}
114
115/*
116 * device node operations
117 */
118static unsigned int maint_poll(struct file *file, poll_table *wait)
119{
120	unsigned int mask = 0;
121
122	poll_wait(file, &msgwaitq, wait);
123	mask = POLLOUT | POLLWRNORM;
124	if (file->private_data || diva_dbg_q_length()) {
125		mask |= POLLIN | POLLRDNORM;
126	}
127	return (mask);
128}
129
130static int maint_open(struct inode *ino, struct file *filep)
131{
132	int ret;
133
134	mutex_lock(&maint_mutex);
135	/* only one open is allowed, so we test
136	   it atomically */
137	if (test_and_set_bit(0, &opened))
138		ret = -EBUSY;
139	else {
140		filep->private_data = NULL;
141		ret = nonseekable_open(ino, filep);
142	}
143	mutex_unlock(&maint_mutex);
144	return ret;
145}
146
147static int maint_close(struct inode *ino, struct file *filep)
148{
149	if (filep->private_data) {
150		diva_os_free(0, filep->private_data);
151		filep->private_data = NULL;
152	}
153
154	/* clear 'used' flag */
155	clear_bit(0, &opened);
156
157	return (0);
158}
159
160static ssize_t divas_maint_write(struct file *file, const char __user *buf,
161				 size_t count, loff_t *ppos)
162{
163	return (maint_read_write((char __user *) buf, (int) count));
164}
165
166static ssize_t divas_maint_read(struct file *file, char __user *buf,
167				size_t count, loff_t *ppos)
168{
169	return (maint_read_write(buf, (int) count));
170}
171
172static const struct file_operations divas_maint_fops = {
173	.owner   = THIS_MODULE,
174	.llseek  = no_llseek,
175	.read    = divas_maint_read,
176	.write   = divas_maint_write,
177	.poll    = maint_poll,
178	.open    = maint_open,
179	.release = maint_close
180};
181
182static void divas_maint_unregister_chrdev(void)
183{
184	unregister_chrdev(major, DEVNAME);
185}
186
187static int __init divas_maint_register_chrdev(void)
188{
189	if ((major = register_chrdev(0, DEVNAME, &divas_maint_fops)) < 0)
190	{
191		printk(KERN_ERR "%s: failed to create /dev entry.\n",
192		       DRIVERLNAME);
193		return (0);
194	}
195
196	return (1);
197}
198
199/*
200 * wake up reader
201 */
202void diva_maint_wakeup_read(void)
203{
204	wake_up_interruptible(&msgwaitq);
205}
206
207/*
208 *  Driver Load
209 */
210static int __init maint_init(void)
211{
212	char tmprev[50];
213	int ret = 0;
214	void *buffer = NULL;
215
216	do_gettimeofday(&start_time);
217	init_waitqueue_head(&msgwaitq);
218
219	printk(KERN_INFO "%s\n", DRIVERNAME);
220	printk(KERN_INFO "%s: Rel:%s  Rev:", DRIVERLNAME, DRIVERRELEASE_MNT);
221	strcpy(tmprev, main_revision);
222	printk("%s  Build: %s \n", getrev(tmprev), DIVA_BUILD);
223
224	if (!divas_maint_register_chrdev()) {
225		ret = -EIO;
226		goto out;
227	}
228
229	if (!(mntfunc_init(&buffer_length, &buffer, diva_dbg_mem))) {
230		printk(KERN_ERR "%s: failed to connect to DIDD.\n",
231		       DRIVERLNAME);
232		divas_maint_unregister_chrdev();
233		ret = -EIO;
234		goto out;
235	}
236
237	printk(KERN_INFO "%s: trace buffer = %p - %d kBytes, %s (Major: %d)\n",
238	       DRIVERLNAME, buffer, (buffer_length / 1024),
239	       (diva_dbg_mem == 0) ? "internal" : "external", major);
240
241out:
242	return (ret);
243}
244
245/*
246**  Driver Unload
247*/
248static void __exit maint_exit(void)
249{
250	divas_maint_unregister_chrdev();
251	mntfunc_finit();
252
253	printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
254}
255
256module_init(maint_init);
257module_exit(maint_exit);
258