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/*
* Copyright 2008 by Karsten Keil <kkeil@novell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/mISDNif.h>
#include "core.h"
static u_int debug;
MODULE_AUTHOR("Karsten Keil");
MODULE_LICENSE("GPL");
module_param(debug, uint, S_IRUGO | S_IWUSR);
static LIST_HEAD(devices);
static DEFINE_RWLOCK(device_lock);
static u64 device_ids;
#define MAX_DEVICE_ID 63
static LIST_HEAD(Bprotocols);
static DEFINE_RWLOCK(bp_lock);
struct mISDNdevice
*get_mdevice(u_int id)
{
struct mISDNdevice *dev;
read_lock(&device_lock);
list_for_each_entry(dev, &devices, D.list)
if (dev->id == id) {
read_unlock(&device_lock);
return dev;
}
read_unlock(&device_lock);
return NULL;
}
int
get_mdevice_count(void)
{
struct mISDNdevice *dev;
int cnt = 0;
read_lock(&device_lock);
list_for_each_entry(dev, &devices, D.list)
cnt++;
read_unlock(&device_lock);
return cnt;
}
static int
get_free_devid(void)
{
u_int i;
for (i = 0; i <= MAX_DEVICE_ID; i++)
if (!test_and_set_bit(i, (u_long *)&device_ids))
return i;
return -1;
}
int
mISDN_register_device(struct mISDNdevice *dev, char *name)
{
u_long flags;
int err;
dev->id = get_free_devid();
if (dev->id < 0)
return -EBUSY;
if (name && name[0])
strcpy(dev->name, name);
else
sprintf(dev->name, "mISDN%d", dev->id);
if (debug & DEBUG_CORE)
printk(KERN_DEBUG "mISDN_register %s %d\n",
dev->name, dev->id);
err = create_stack(dev);
if (err)
return err;
write_lock_irqsave(&device_lock, flags);
list_add_tail(&dev->D.list, &devices);
write_unlock_irqrestore(&device_lock, flags);
return 0;
}
EXPORT_SYMBOL(mISDN_register_device);
void
mISDN_unregister_device(struct mISDNdevice *dev) {
u_long flags;
if (debug & DEBUG_CORE)
printk(KERN_DEBUG "mISDN_unregister %s %d\n",
dev->name, dev->id);
write_lock_irqsave(&device_lock, flags);
list_del(&dev->D.list);
write_unlock_irqrestore(&device_lock, flags);
test_and_clear_bit(dev->id, (u_long *)&device_ids);
delete_stack(dev);
}
EXPORT_SYMBOL(mISDN_unregister_device);
u_int
get_all_Bprotocols(void)
{
struct Bprotocol *bp;
u_int m = 0;
read_lock(&bp_lock);
list_for_each_entry(bp, &Bprotocols, list)
m |= bp->Bprotocols;
read_unlock(&bp_lock);
return m;
}
struct Bprotocol *
get_Bprotocol4mask(u_int m)
{
struct Bprotocol *bp;
read_lock(&bp_lock);
list_for_each_entry(bp, &Bprotocols, list)
if (bp->Bprotocols & m) {
read_unlock(&bp_lock);
return bp;
}
read_unlock(&bp_lock);
return NULL;
}
struct Bprotocol *
get_Bprotocol4id(u_int id)
{
u_int m;
if (id < ISDN_P_B_START || id > 63) {
printk(KERN_WARNING "%s id not in range %d\n",
__func__, id);
return NULL;
}
m = 1 << (id & ISDN_P_B_MASK);
return get_Bprotocol4mask(m);
}
int
mISDN_register_Bprotocol(struct Bprotocol *bp)
{
u_long flags;
struct Bprotocol *old;
if (debug & DEBUG_CORE)
printk(KERN_DEBUG "%s: %s/%x\n", __func__,
bp->name, bp->Bprotocols);
old = get_Bprotocol4mask(bp->Bprotocols);
if (old) {
printk(KERN_WARNING
"register duplicate protocol old %s/%x new %s/%x\n",
old->name, old->Bprotocols, bp->name, bp->Bprotocols);
return -EBUSY;
}
write_lock_irqsave(&bp_lock, flags);
list_add_tail(&bp->list, &Bprotocols);
write_unlock_irqrestore(&bp_lock, flags);
return 0;
}
EXPORT_SYMBOL(mISDN_register_Bprotocol);
void
mISDN_unregister_Bprotocol(struct Bprotocol *bp)
{
u_long flags;
if (debug & DEBUG_CORE)
printk(KERN_DEBUG "%s: %s/%x\n", __func__, bp->name,
bp->Bprotocols);
write_lock_irqsave(&bp_lock, flags);
list_del(&bp->list);
write_unlock_irqrestore(&bp_lock, flags);
}
EXPORT_SYMBOL(mISDN_unregister_Bprotocol);
static int
mISDNInit(void)
{
int err;
printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
mISDN_initstack(&debug);
err = mISDN_inittimer(&debug);
if (err)
goto error;
err = l1_init(&debug);
if (err) {
mISDN_timer_cleanup();
goto error;
}
err = Isdnl2_Init(&debug);
if (err) {
mISDN_timer_cleanup();
l1_cleanup();
goto error;
}
err = misdn_sock_init(&debug);
if (err) {
mISDN_timer_cleanup();
l1_cleanup();
Isdnl2_cleanup();
}
error:
return err;
}
static void mISDN_cleanup(void)
{
misdn_sock_cleanup();
mISDN_timer_cleanup();
l1_cleanup();
Isdnl2_cleanup();
if (!list_empty(&devices))
printk(KERN_ERR "%s devices still registered\n", __func__);
if (!list_empty(&Bprotocols))
printk(KERN_ERR "%s Bprotocols still registered\n", __func__);
printk(KERN_DEBUG "mISDNcore unloaded\n");
}
module_init(mISDNInit);
module_exit(mISDN_cleanup);
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