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/drivers/isdn/hardware/eicon/divamnt.c

http://github.com/mirrors/linux
C | 239 lines | 164 code | 40 blank | 35 comment | 10 complexity | 53d4cd0eb22643093bb09de6c857c4b4 MD5 | raw file
  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 $";
 27
 28static int major;
 29
 30MODULE_DESCRIPTION("Maint driver for Eicon DIVA Server cards");
 31MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
 32MODULE_SUPPORTED_DEVICE("DIVA card driver");
 33MODULE_LICENSE("GPL");
 34
 35static int buffer_length = 128;
 36module_param(buffer_length, int, 0);
 37static unsigned long diva_dbg_mem = 0;
 38module_param(diva_dbg_mem, ulong, 0);
 39
 40static char *DRIVERNAME =
 41	"Eicon DIVA - MAINT module (http://www.melware.net)";
 42static char *DRIVERLNAME = "diva_mnt";
 43static char *DEVNAME = "DivasMAINT";
 44char *DRIVERRELEASE_MNT = "2.0";
 45
 46static wait_queue_head_t msgwaitq;
 47static unsigned long opened;
 48
 49extern int mntfunc_init(int *, void **, unsigned long);
 50extern void mntfunc_finit(void);
 51extern int maint_read_write(void __user *buf, int count);
 52
 53/*
 54 *  helper functions
 55 */
 56static char *getrev(const char *revision)
 57{
 58	char *rev;
 59	char *p;
 60
 61	if ((p = strchr(revision, ':'))) {
 62		rev = p + 2;
 63		p = strchr(rev, '$');
 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);