path: root/drivers/isdn/capi/capi.c

/* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
 *
 * CAPI 2.0 Interface for Linux
 *
 * Copyright 1996 by Carsten Paeth <calle@calle.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/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <linux/mutex.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/tty.h>
#include <linux/netdevice.h>
#include <linux/ppp_defs.h>
#include <linux/ppp-ioctl.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/capi.h>
#include <linux/kernelcapi.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/isdn/capiutil.h>
#include <linux/isdn/capicmd.h>

MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
MODULE_AUTHOR("Carsten Paeth");
MODULE_LICENSE("GPL");

/* -------- driver information -------------------------------------- */

static DEFINE_MUTEX(capi_mutex);
static struct class *capi_class;
static int capi_major = 68;		/* allocated */

module_param_named(major, capi_major, uint, 0);

#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
#define CAPINC_NR_PORTS		32
#define CAPINC_MAX_PORTS	256

static int capi_ttyminors = CAPINC_NR_PORTS;

module_param_named(ttyminors, capi_ttyminors, uint, 0);
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */

/* -------- defines ------------------------------------------------- */

#define CAPINC_MAX_RECVQUEUE	10
#define CAPINC_MAX_SENDQUEUE	10
#define CAPI_MAX_BLKSIZE	2048

/* -------- data structures ----------------------------------------- */

struct capidev;
struct capincci;
struct capiminor;

struct ackqueue_entry {
	struct list_head	list;
	u16			datahandle;
};

struct capiminor {
	struct kref kref;

	unsigned int      minor;

	struct capi20_appl	*ap;
	u32			ncci;
	atomic_t		datahandle;
	atomic_t		msgid;

	struct tty_port port;
	int                ttyinstop;
	int                ttyoutstop;

	struct sk_buff_head	inqueue;

	struct sk_buff_head	outqueue;
	int			outbytes;
	struct sk_buff		*outskb;
	spinlock_t		outlock;

	/* transmit path */
	struct list_head ackqueue;
	int nack;
	spinlock_t ackqlock;
};

struct capincci {
	struct list_head list;
	u32		 ncci;
	struct capidev	*cdev;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
	struct capiminor *minorp;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
};

struct capidev {
	struct list_head list;
	struct capi20_appl ap;
	u16		errcode;
	unsigned        userflags;

	struct sk_buff_head recvqueue;
	wait_queue_head_t recvwait;

	struct list_head nccis;

	struct mutex lock;
};

/* -------- global variables ---------------------------------------- */

static DEFINE_MUTEX(capidev_list_lock);
static LIST_HEAD(capidev_list);

#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE

static DEFINE_SPINLOCK(capiminors_lock);
static struct capiminor **capiminors;

static struct tty_driver *capinc_tty_driver;

/* -------- datahandles --------------------------------------------- */

static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
{
	struct ackqueue_entry *n;

	n = kmalloc(sizeof(*n), GFP_ATOMIC);
	if (unlikely(!n)) {
		printk(KERN_ERR "capi: alloc datahandle failed\n");
		return -1;
	}
	n->datahandle = datahandle;
	INIT_LIST_HEAD(&