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6576c2891a
linux/drivers/isdn/capi/capi.c
Jan Kiszka 6576c2891a CAPI: Drop obsolete nccip from capiminor struct 
The nccip in capiminor used to serve as an indicator that the NCCI was
close. But we don't need this, we issue a hangup on capincci_free_minor.
So drop this legacy.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-02-16 16:01:30 -08:00

1543 lines
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/* $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/smp_lock.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/tty.h>
#include <linux/netdevice.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.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>
#include "capifs.h"
MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
MODULE_AUTHOR("Carsten Paeth");
MODULE_LICENSE("GPL");
#undef _DEBUG_REFCOUNT /* alloc/free and open/close debug */
#undef _DEBUG_TTYFUNCS /* call to tty_driver */
#undef _DEBUG_DATAFLOW /* data flow */
/* -------- driver information -------------------------------------- */
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 datahandle_queue {
struct list_head list;
u16 datahandle;
};
struct capiminor {
struct kref kref;
unsigned int minor;
struct dentry *capifs_dentry;
struct capi20_appl *ap;
u32 ncci;
u16 datahandle;
u16 msgid;
struct tty_port port;
int ttyinstop;
int ttyoutstop;
struct sk_buff *ttyskb;
atomic_t ttyopencount;
struct sk_buff_head inqueue;
int inbytes;
struct sk_buff_head outqueue;
int outbytes;
/* transmit path */
struct list_head ackqueue;
int nack;
spinlock_t ackqlock;
};
/* FIXME: The following lock is a sledgehammer-workaround to a
* locking issue with the capiminor (and maybe other) data structure(s).
* Access to this data is done in a racy way and crashes the machine with
* a FritzCard DSL driver; sooner or later. This is a workaround
* which trades scalability vs stability, so it doesn't crash the kernel anymore.
* The correct (and scalable) fix for the issue seems to require
* an API change to the drivers... . */
static DEFINE_SPINLOCK(workaround_lock);
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_RWLOCK(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 datahandle_queue *n;
unsigned long flags;
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(&n->list);
spin_lock_irqsave(&mp->ackqlock, flags);
list_add_tail(&n->list, &mp->ackqueue);
mp->nack++;
spin_unlock_irqrestore(&mp->ackqlock, flags);
return 0;
}
static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
{
struct datahandle_queue *p, *tmp;
unsigned long flags;
spin_lock_irqsave(&mp->ackqlock, flags);
list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
if (p->datahandle == datahandle) {
list_del(&p->list);
kfree(p);
mp->nack--;
spin_unlock_irqrestore(&mp->ackqlock, flags);
return 0;
}
}
spin_unlock_irqrestore(&mp->ackqlock, flags);
return -1;
}
static void capiminor_del_all_ack(struct capiminor *mp)
{
struct datahandle_queue *p, *tmp;
unsigned long flags;
spin_lock_irqsave(&mp->ackqlock, flags);
list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
list_del(&p->list);
kfree(p);
mp->nack--;
}
spin_unlock_irqrestore(&mp->ackqlock, flags);
}
/* -------- struct capiminor ---------------------------------------- */
static const struct tty_port_operations capiminor_port_ops; /* we have none */
static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
{
struct capiminor *mp;
struct device *dev;
unsigned int minor;
unsigned long flags;
mp = kzalloc(sizeof(*mp), GFP_KERNEL);
if (!mp) {
printk(KERN_ERR "capi: can't alloc capiminor\n");
return NULL;
}
kref_init(&mp->kref);
mp->ap = ap;
mp->ncci = ncci;
mp->msgid = 0;
atomic_set(&mp->ttyopencount,0);
INIT_LIST_HEAD(&mp->ackqueue);
spin_lock_init(&mp->ackqlock);
skb_queue_head_init(&mp->inqueue);
skb_queue_head_init(&mp->outqueue);
tty_port_init(&mp->port);
mp->port.ops = &capiminor_port_ops;
/* Allocate the least unused minor number. */
write_lock_irqsave(&capiminors_lock, flags);
for (minor = 0; minor < capi_ttyminors; minor++)
if (!capiminors[minor]) {
capiminors[minor] = mp;
break;
}
write_unlock_irqrestore(&capiminors_lock, flags);
if (minor == capi_ttyminors) {
printk(KERN_NOTICE "capi: out of minors\n");
goto err_out1;
}
mp->minor = minor;
dev = tty_register_device(capinc_tty_driver, minor, NULL);
if (IS_ERR(dev))
goto err_out2;
return mp;
err_out2:
write_lock_irqsave(&capiminors_lock, flags);
capiminors[minor] = NULL;
write_unlock_irqrestore(&capiminors_lock, flags);
err_out1:
kfree(mp);
return NULL;
}
static void capiminor_destroy(struct kref *kref)
{
struct capiminor *mp = container_of(kref, struct capiminor, kref);
kfree_skb(mp->ttyskb);
skb_queue_purge(&mp->inqueue);
skb_queue_purge(&mp->outqueue);
capiminor_del_all_ack(mp);
kfree(mp);
}
static struct capiminor *capiminor_get(unsigned int minor)
{
struct capiminor *mp;
read_lock(&capiminors_lock);
mp = capiminors[minor];
if (mp)
kref_get(&mp->kref);
read_unlock(&capiminors_lock);
return mp;
}
static inline void capiminor_put(struct capiminor *mp)
{
kref_put(&mp->kref, capiminor_destroy);
}
static void capiminor_free(struct capiminor *mp)
{
unsigned long flags;
tty_unregister_device(capinc_tty_driver, mp->minor);
write_lock_irqsave(&capiminors_lock, flags);
capiminors[mp->minor] = NULL;
write_unlock_irqrestore(&capiminors_lock, flags);
capiminor_put(mp);
}
/* -------- struct capincci ----------------------------------------- */
static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
{
struct capiminor *mp;
dev_t device;
if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
return;
mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
if (mp) {
device = MKDEV(capinc_tty_driver->major, mp->minor);
mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
}
}
static void capincci_free_minor(struct capincci *np)
{
struct capiminor *mp = np->minorp;
struct tty_struct *tty;
if (mp) {
capifs_free_ncci(mp->capifs_dentry);
tty = tty_port_tty_get(&mp->port);
if (tty) {
tty_vhangup(tty);
tty_kref_put(tty);
}
capiminor_free(mp);
}
}
static inline unsigned int capincci_minor_opencount(struct capincci *np)
{
struct capiminor *mp = np->minorp;
return mp ? atomic_read(&mp->ttyopencount) : 0;
}
#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
static inline void
capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
static inline void capincci_free_minor(struct capincci *np) { }
static inline unsigned int capincci_minor_opencount(struct capincci *np)
{
return 0;
}
#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
{
struct capincci *np;
np = kzalloc(sizeof(*np), GFP_KERNEL);
if (!np)
return NULL;
np->ncci = ncci;
np->cdev = cdev;
capincci_alloc_minor(cdev, np);
list_add_tail(&np->list, &cdev->nccis);
return np;
}
static void capincci_free(struct capidev *cdev, u32 ncci)
{
struct capincci *np, *tmp;
list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
if (ncci == 0xffffffff || np->ncci == ncci) {
capincci_free_minor(np);
list_del(&np->list);
kfree(np);
}
}
static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
{
struct capincci *np;
list_for_each_entry(np, &cdev->nccis, list)
if (np->ncci == ncci)
return np;
return NULL;
}
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
/* -------- handle data queue --------------------------------------- */
static struct sk_buff *
gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
{
struct sk_buff *nskb;
nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
if (nskb) {
u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
capimsg_setu16(s, 2, mp->ap->applid);
capimsg_setu8 (s, 4, CAPI_DATA_B3);
capimsg_setu8 (s, 5, CAPI_RESP);
capimsg_setu16(s, 6, mp->msgid++);
capimsg_setu32(s, 8, mp->ncci);
capimsg_setu16(s, 12, datahandle);
}
return nskb;
}
static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
{
struct tty_struct *tty;
struct sk_buff *nskb;
int datalen;
u16 errcode, datahandle;
struct tty_ldisc *ld;
int ret = -1;
datalen = skb->len - CAPIMSG_LEN(skb->data);
tty = tty_port_tty_get(&mp->port);
if (!tty) {
#ifdef _DEBUG_DATAFLOW
printk(KERN_DEBUG "capi: currently no receiver\n");
#endif
return -1;
}
ld = tty_ldisc_ref(tty);
if (!ld)
goto out1;
if (ld->ops->receive_buf == NULL) {
#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
#endif
goto out2;
}
if (mp->ttyinstop) {
#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
printk(KERN_DEBUG "capi: recv tty throttled\n");
#endif
goto out2;
}
if (tty->receive_room < datalen) {
#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
printk(KERN_DEBUG "capi: no room in tty\n");
#endif
goto out2;
}
if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
goto out2;
}
datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
errcode = capi20_put_message(mp->ap, nskb);
if (errcode != CAPI_NOERROR) {
printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
errcode);
kfree_skb(nskb);
goto out2;
}
(void)skb_pull(skb, CAPIMSG_LEN(skb->data));
#ifdef _DEBUG_DATAFLOW
printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
datahandle, skb->len);
#endif
ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
kfree_skb(skb);
ret = 0;
out2:
tty_ldisc_deref(ld);
out1:
tty_kref_put(tty);
return ret;
}
static void handle_minor_recv(struct capiminor *mp)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
unsigned int len = skb->len;
mp->inbytes -= len;
if (handle_recv_skb(mp, skb) < 0) {
skb_queue_head(&mp->inqueue, skb);
mp->inbytes += len;
return;
}
}
}
static int handle_minor_send(struct capiminor *mp)
{
struct tty_struct *tty;
struct sk_buff *skb;
u16 len;
int count = 0;
u16 errcode;
u16 datahandle;
tty = tty_port_tty_get(&mp->port);
if (!tty)
return 0;
if (mp->ttyoutstop) {
#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
printk(KERN_DEBUG "capi: send: tty stopped\n");
#endif
tty_kref_put(tty);
return 0;
}
while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
datahandle = mp->datahandle;
len = (u16)skb->len;
skb_push(skb, CAPI_DATA_B3_REQ_LEN);
memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
capimsg_setu16(skb->data, 2, mp->ap->applid);
capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
capimsg_setu8 (skb->data, 5, CAPI_REQ);
capimsg_setu16(skb->data, 6, mp->msgid++);
capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
capimsg_setu16(skb->data, 16, len); /* Data length */
capimsg_setu16(skb->data, 18, datahandle);
capimsg_setu16(skb->data, 20, 0); /* Flags */
if (capiminor_add_ack(mp, datahandle) < 0) {
skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
skb_queue_head(&mp->outqueue, skb);
tty_kref_put(tty);
return count;
}
errcode = capi20_put_message(mp->ap, skb);
if (errcode == CAPI_NOERROR) {
mp->datahandle++;
count++;
mp->outbytes -= len;
#ifdef _DEBUG_DATAFLOW
printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
datahandle, len);
#endif
continue;
}
capiminor_del_ack(mp, datahandle);
if (errcode == CAPI_SENDQUEUEFULL) {
skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
skb_queue_head(&mp->outqueue, skb);
break;
}
/* ups, drop packet */
printk(KERN_ERR "capi: put_message = %x\n", errcode);
mp->outbytes -= len;
kfree_skb(skb);
}
tty_kref_put(tty);
return count;
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
/* -------- function called by lower level -------------------------- */
static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
{
struct capidev *cdev = ap->private;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
struct tty_struct *tty;
struct capiminor *mp;
u16 datahandle;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
struct capincci *np;
unsigned long flags;
mutex_lock(&cdev->lock);
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
u16 info = CAPIMSG_U16(skb->data, 12); // Info field
if ((info & 0xff00) == 0)
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
}
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
spin_lock_irqsave(&workaround_lock, flags);
if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
goto unlock_out;
}
np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
if (!np) {
printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
goto unlock_out;
}
#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
mp = np->minorp;
if (!mp) {
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
goto unlock_out;
}
if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
#ifdef _DEBUG_DATAFLOW
printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
datahandle, skb->len-CAPIMSG_LEN(skb->data));
#endif
skb_queue_tail(&mp->inqueue, skb);
mp->inbytes += skb->len;
handle_minor_recv(mp);
} else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
#ifdef _DEBUG_DATAFLOW
printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
datahandle,
CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
#endif
kfree_skb(skb);
(void)capiminor_del_ack(mp, datahandle);
tty = tty_port_tty_get(&mp->port);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
}
(void)handle_minor_send(mp);
} else {
/* ups, let capi application handle it :-) */
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
unlock_out:
spin_unlock_irqrestore(&workaround_lock, flags);
mutex_unlock(&cdev->lock);
}
/* -------- file_operations for capidev ----------------------------- */
static ssize_t
capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
struct capidev *cdev = (struct capidev *)file->private_data;
struct sk_buff *skb;
size_t copied;
int err;
if (!cdev->ap.applid)
return -ENODEV;
skb = skb_dequeue(&cdev->recvqueue);
if (!skb) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
err = wait_event_interruptible(cdev->recvwait,
(skb = skb_dequeue(&cdev->recvqueue)));
if (err)
return err;
}
if (skb->len > count) {
skb_queue_head(&cdev->recvqueue, skb);
return -EMSGSIZE;
}
if (copy_to_user(buf, skb->data, skb->len)) {
skb_queue_head(&cdev->recvqueue, skb);
return -EFAULT;
}
copied = skb->len;
kfree_skb(skb);
return copied;
}
static ssize_t
capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
struct capidev *cdev = (struct capidev *)file->private_data;
struct sk_buff *skb;
u16 mlen;
if (!cdev->ap.applid)
return -ENODEV;
skb = alloc_skb(count, GFP_USER);
if (!skb)
return -ENOMEM;
if (copy_from_user(skb_put(skb, count), buf, count)) {
kfree_skb(skb);
return -EFAULT;
}
mlen = CAPIMSG_LEN(skb->data);
if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
kfree_skb(skb);
return -EINVAL;
}
} else {
if (mlen != count) {
kfree_skb(skb);
return -EINVAL;
}
}
CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
mutex_lock(&cdev->lock);
capincci_free(cdev, CAPIMSG_NCCI(skb->data));
mutex_unlock(&cdev->lock);
}
cdev->errcode = capi20_put_message(&cdev->ap, skb);
if (cdev->errcode) {
kfree_skb(skb);
return -EIO;
}
return count;
}
static unsigned int
capi_poll(struct file *file, poll_table * wait)
{
struct capidev *cdev = (struct capidev *)file->private_data;
unsigned int mask = 0;
if (!cdev->ap.applid)
return POLLERR;
poll_wait(file, &(cdev->recvwait), wait);
mask = POLLOUT | POLLWRNORM;
if (!skb_queue_empty(&cdev->recvqueue))
mask |= POLLIN | POLLRDNORM;
return mask;
}
static int
capi_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct capidev *cdev = file->private_data;
capi_ioctl_struct data;
int retval = -EINVAL;
void __user *argp = (void __user *)arg;
switch (cmd) {
case CAPI_REGISTER:
mutex_lock(&cdev->lock);
if (cdev->ap.applid) {
retval = -EEXIST;
goto register_out;
}
if (copy_from_user(&cdev->ap.rparam, argp,
sizeof(struct capi_register_params))) {
retval = -EFAULT;
goto register_out;
}
cdev->ap.private = cdev;
cdev->ap.recv_message = capi_recv_message;
cdev->errcode = capi20_register(&cdev->ap);
retval = (int)cdev->ap.applid;
if (cdev->errcode) {
cdev->ap.applid = 0;
retval = -EIO;
}
register_out:
mutex_unlock(&cdev->lock);
return retval;
case CAPI_GET_VERSION:
{
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
cdev->errcode = capi20_get_version(data.contr, &data.version);
if (cdev->errcode)
return -EIO;
if (copy_to_user(argp, &data.version,
sizeof(data.version)))
return -EFAULT;
}
return 0;
case CAPI_GET_SERIAL:
{
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
cdev->errcode = capi20_get_serial (data.contr, data.serial);
if (cdev->errcode)
return -EIO;
if (copy_to_user(argp, data.serial,
sizeof(data.serial)))
return -EFAULT;
}
return 0;
case CAPI_GET_PROFILE:
{
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
if (data.contr == 0) {
cdev->errcode = capi20_get_profile(data.contr, &data.profile);
if (cdev->errcode)
return -EIO;
retval = copy_to_user(argp,
&data.profile.ncontroller,
sizeof(data.profile.ncontroller));
} else {
cdev->errcode = capi20_get_profile(data.contr, &data.profile);
if (cdev->errcode)
return -EIO;
retval = copy_to_user(argp, &data.profile,
sizeof(data.profile));
}
if (retval)
return -EFAULT;
}
return 0;
case CAPI_GET_MANUFACTURER:
{
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
if (cdev->errcode)
return -EIO;
if (copy_to_user(argp, data.manufacturer,
sizeof(data.manufacturer)))
return -EFAULT;
}
return 0;
case CAPI_GET_ERRCODE:
data.errcode = cdev->errcode;
cdev->errcode = CAPI_NOERROR;
if (arg) {
if (copy_to_user(argp, &data.errcode,
sizeof(data.errcode)))
return -EFAULT;
}
return data.errcode;
case CAPI_INSTALLED:
if (capi20_isinstalled() == CAPI_NOERROR)
return 0;
return -ENXIO;
case CAPI_MANUFACTURER_CMD:
{
struct capi_manufacturer_cmd mcmd;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
return -EFAULT;
return capi20_manufacturer(mcmd.cmd, mcmd.data);
}
return 0;
case CAPI_SET_FLAGS:
case CAPI_CLR_FLAGS: {
unsigned userflags;
if (copy_from_user(&userflags, argp, sizeof(userflags)))
return -EFAULT;
mutex_lock(&cdev->lock);
if (cmd == CAPI_SET_FLAGS)
cdev->userflags |= userflags;
else
cdev->userflags &= ~userflags;
mutex_unlock(&cdev->lock);
return 0;
}
case CAPI_GET_FLAGS:
if (copy_to_user(argp, &cdev->userflags,
sizeof(cdev->userflags)))
return -EFAULT;
return 0;
case CAPI_NCCI_OPENCOUNT: {
struct capincci *nccip;
unsigned ncci;
int count = 0;
if (copy_from_user(&ncci, argp, sizeof(ncci)))
return -EFAULT;
mutex_lock(&cdev->lock);
nccip = capincci_find(cdev, (u32)ncci);
if (nccip)
count = capincci_minor_opencount(nccip);
mutex_unlock(&cdev->lock);
return count;
}
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
case CAPI_NCCI_GETUNIT: {
struct capincci *nccip;
struct capiminor *mp;
unsigned ncci;
int unit = -ESRCH;
if (copy_from_user(&ncci, argp, sizeof(ncci)))
return -EFAULT;
mutex_lock(&cdev->lock);
nccip = capincci_find(cdev, (u32)ncci);
if (nccip) {
mp = nccip->minorp;
if (mp)
unit = mp->minor;
}
mutex_unlock(&cdev->lock);
return unit;
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
default:
return -EINVAL;
}
}
static int capi_open(struct inode *inode, struct file *file)
{
struct capidev *cdev;
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
if (!cdev)
return -ENOMEM;
mutex_init(&cdev->lock);
skb_queue_head_init(&cdev->recvqueue);
init_waitqueue_head(&cdev->recvwait);
INIT_LIST_HEAD(&cdev->nccis);
file->private_data = cdev;
mutex_lock(&capidev_list_lock);
list_add_tail(&cdev->list, &capidev_list);
mutex_unlock(&capidev_list_lock);
return nonseekable_open(inode, file);
}
static int capi_release(struct inode *inode, struct file *file)
{
struct capidev *cdev = file->private_data;
mutex_lock(&capidev_list_lock);
list_del(&cdev->list);
mutex_unlock(&capidev_list_lock);
if (cdev->ap.applid)
capi20_release(&cdev->ap);
skb_queue_purge(&cdev->recvqueue);
capincci_free(cdev, 0xffffffff);
kfree(cdev);
return 0;
}
static const struct file_operations capi_fops =
{
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = capi_read,
.write = capi_write,
.poll = capi_poll,
.ioctl = capi_ioctl,
.open = capi_open,
.release = capi_release,
};
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
/* -------- tty_operations for capincci ----------------------------- */
static int
capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
int idx = tty->index;
struct capiminor *mp = capiminor_get(idx);
int ret = tty_init_termios(tty);
if (ret == 0) {
tty_driver_kref_get(driver);
tty->count++;
tty->driver_data = mp;
driver->ttys[idx] = tty;
} else
capiminor_put(mp);
return ret;
}
static void capinc_tty_cleanup(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
tty->driver_data = NULL;
capiminor_put(mp);
}
static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
{
struct capiminor *mp = tty->driver_data;
unsigned long flags;
int err;
err = tty_port_open(&mp->port, tty, filp);
if (err)
return err;
spin_lock_irqsave(&workaround_lock, flags);
atomic_inc(&mp->ttyopencount);
#ifdef _DEBUG_REFCOUNT
printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
#endif
handle_minor_recv(mp);
spin_unlock_irqrestore(&workaround_lock, flags);
return 0;
}
static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
{
struct capiminor *mp = tty->driver_data;
if (atomic_dec_and_test(&mp->ttyopencount)) {
#ifdef _DEBUG_REFCOUNT
printk(KERN_DEBUG "capinc_tty_close lastclose\n");
#endif
}
#ifdef _DEBUG_REFCOUNT
printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
#endif
#ifdef _DEBUG_REFCOUNT
printk(KERN_DEBUG "capinc_tty_close\n");
#endif
tty_port_close(&mp->port, tty, filp);
}
static int capinc_tty_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct capiminor *mp = tty->driver_data;
struct sk_buff *skb;
unsigned long flags;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
#endif
spin_lock_irqsave(&workaround_lock, flags);
skb = mp->ttyskb;
if (skb) {
mp->ttyskb = NULL;
skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
}
skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
if (!skb) {
printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
spin_unlock_irqrestore(&workaround_lock, flags);
return -ENOMEM;
}
skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
memcpy(skb_put(skb, count), buf, count);
skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
(void)handle_minor_send(mp);
(void)handle_minor_recv(mp);
spin_unlock_irqrestore(&workaround_lock, flags);
return count;
}
static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
{
struct capiminor *mp = tty->driver_data;
struct sk_buff *skb;
unsigned long flags;
int ret = 1;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
#endif
spin_lock_irqsave(&workaround_lock, flags);
skb = mp->ttyskb;
if (skb) {
if (skb_tailroom(skb) > 0) {
*(skb_put(skb, 1)) = ch;
spin_unlock_irqrestore(&workaround_lock, flags);
return 1;
}
mp->ttyskb = NULL;
skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
(void)handle_minor_send(mp);
}
skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
if (skb) {
skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
*(skb_put(skb, 1)) = ch;
mp->ttyskb = skb;
} else {
printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
ret = 0;
}
spin_unlock_irqrestore(&workaround_lock, flags);
return ret;
}
static void capinc_tty_flush_chars(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
struct sk_buff *skb;
unsigned long flags;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_flush_chars\n");
#endif
spin_lock_irqsave(&workaround_lock, flags);
skb = mp->ttyskb;
if (skb) {
mp->ttyskb = NULL;
skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
(void)handle_minor_send(mp);
}
(void)handle_minor_recv(mp);
spin_unlock_irqrestore(&workaround_lock, flags);
}
static int capinc_tty_write_room(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
int room;
room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
room *= CAPI_MAX_BLKSIZE;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
#endif
return room;
}
static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
mp->outbytes, mp->nack,
skb_queue_len(&mp->outqueue),
skb_queue_len(&mp->inqueue));
#endif
return mp->outbytes;
}
static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
int error = 0;
switch (cmd) {
default:
error = n_tty_ioctl_helper(tty, file, cmd, arg);
break;
}
return error;
}
static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
{
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_set_termios\n");
#endif
}
static void capinc_tty_throttle(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_throttle\n");
#endif
mp->ttyinstop = 1;
}
static void capinc_tty_unthrottle(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
unsigned long flags;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_unthrottle\n");
#endif
spin_lock_irqsave(&workaround_lock, flags);
mp->ttyinstop = 0;
handle_minor_recv(mp);
spin_unlock_irqrestore(&workaround_lock, flags);
}
static void capinc_tty_stop(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_stop\n");
#endif
mp->ttyoutstop = 1;
}
static void capinc_tty_start(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
unsigned long flags;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_start\n");
#endif
spin_lock_irqsave(&workaround_lock, flags);
mp->ttyoutstop = 0;
(void)handle_minor_send(mp);
spin_unlock_irqrestore(&workaround_lock, flags);
}
static void capinc_tty_hangup(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_hangup\n");
#endif
tty_port_hangup(&mp->port);
}
static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
{
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
#endif
return 0;
}
static void capinc_tty_flush_buffer(struct tty_struct *tty)
{
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
#endif
}
static void capinc_tty_set_ldisc(struct tty_struct *tty)
{
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
#endif
}
static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
{
#ifdef _DEBUG_TTYFUNCS
printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
#endif
}
static const struct tty_operations capinc_ops = {
.open = capinc_tty_open,
.close = capinc_tty_close,
.write = capinc_tty_write,
.put_char = capinc_tty_put_char,
.flush_chars = capinc_tty_flush_chars,
.write_room = capinc_tty_write_room,
.chars_in_buffer = capinc_tty_chars_in_buffer,
.ioctl = capinc_tty_ioctl,
.set_termios = capinc_tty_set_termios,
.throttle = capinc_tty_throttle,
.unthrottle = capinc_tty_unthrottle,
.stop = capinc_tty_stop,
.start = capinc_tty_start,
.hangup = capinc_tty_hangup,
.break_ctl = capinc_tty_break_ctl,
.flush_buffer = capinc_tty_flush_buffer,
.set_ldisc = capinc_tty_set_ldisc,
.send_xchar = capinc_tty_send_xchar,
.install = capinc_tty_install,
.cleanup = capinc_tty_cleanup,
};
static int __init capinc_tty_init(void)
{
struct tty_driver *drv;
int err;
if (capi_ttyminors > CAPINC_MAX_PORTS)
capi_ttyminors = CAPINC_MAX_PORTS;
if (capi_ttyminors <= 0)
capi_ttyminors = CAPINC_NR_PORTS;
capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
GFP_KERNEL);
if (!capiminors)
return -ENOMEM;
drv = alloc_tty_driver(capi_ttyminors);
if (!drv) {
kfree(capiminors);
return -ENOMEM;
}
drv->owner = THIS_MODULE;
drv->driver_name = "capi_nc";
drv->name = "capi";
drv->major = 0;
drv->minor_start = 0;
drv->type = TTY_DRIVER_TYPE_SERIAL;
drv->subtype = SERIAL_TYPE_NORMAL;
drv->init_termios = tty_std_termios;
drv->init_termios.c_iflag = ICRNL;
drv->init_termios.c_oflag = OPOST | ONLCR;
drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
drv->init_termios.c_lflag = 0;
drv->flags =
TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
TTY_DRIVER_DYNAMIC_DEV;
tty_set_operations(drv, &capinc_ops);
err = tty_register_driver(drv);
if (err) {
put_tty_driver(drv);
kfree(capiminors);
printk(KERN_ERR "Couldn't register capi_nc driver\n");
return err;
}
capinc_tty_driver = drv;
return 0;
}
static void __exit capinc_tty_exit(void)
{
tty_unregister_driver(capinc_tty_driver);
put_tty_driver(capinc_tty_driver);
kfree(capiminors);
}
#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
static inline int capinc_tty_init(void)
{
return 0;
}
static inline void capinc_tty_exit(void) { }
#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
/* -------- /proc functions ----------------------------------------- */
/*
* /proc/capi/capi20:
* minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
*/
static int capi20_proc_show(struct seq_file *m, void *v)
{
struct capidev *cdev;
struct list_head *l;
mutex_lock(&capidev_list_lock);
list_for_each(l, &capidev_list) {
cdev = list_entry(l, struct capidev, list);
seq_printf(m, "0 %d %lu %lu %lu %lu\n",
cdev->ap.applid,
cdev->ap.nrecvctlpkt,
cdev->ap.nrecvdatapkt,
cdev->ap.nsentctlpkt,
cdev->ap.nsentdatapkt);
}
mutex_unlock(&capidev_list_lock);
return 0;
}
static int capi20_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, capi20_proc_show, NULL);
}
static const struct file_operations capi20_proc_fops = {
.owner = THIS_MODULE,
.open = capi20_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/*
* /proc/capi/capi20ncci:
* applid ncci
*/
static int capi20ncci_proc_show(struct seq_file *m, void *v)
{
struct capidev *cdev;
struct capincci *np;
mutex_lock(&capidev_list_lock);
list_for_each_entry(cdev, &capidev_list, list) {
mutex_lock(&cdev->lock);
list_for_each_entry(np, &cdev->nccis, list)
seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
mutex_unlock(&cdev->lock);
}
mutex_unlock(&capidev_list_lock);
return 0;
}
static int capi20ncci_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, capi20ncci_proc_show, NULL);
}
static const struct file_operations capi20ncci_proc_fops = {
.owner = THIS_MODULE,
.open = capi20ncci_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void __init proc_init(void)
{
proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
}
static void __exit proc_exit(void)
{
remove_proc_entry("capi/capi20", NULL);
remove_proc_entry("capi/capi20ncci", NULL);
}
/* -------- init function and module interface ---------------------- */
static int __init capi_init(void)
{
const char *compileinfo;
int major_ret;
major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
if (major_ret < 0) {
printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
return major_ret;
}
capi_class = class_create(THIS_MODULE, "capi");
if (IS_ERR(capi_class)) {
unregister_chrdev(capi_major, "capi20");
return PTR_ERR(capi_class);
}
device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
if (capinc_tty_init() < 0) {
device_destroy(capi_class, MKDEV(capi_major, 0));
class_destroy(capi_class);
unregister_chrdev(capi_major, "capi20");
return -ENOMEM;
}
proc_init();
#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
compileinfo = " (middleware+capifs)";
#elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
compileinfo = " (no capifs)";
#else
compileinfo = " (no middleware)";
#endif
printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
capi_major, compileinfo);
return 0;
}
static void __exit capi_exit(void)
{
proc_exit();
device_destroy(capi_class, MKDEV(capi_major, 0));
class_destroy(capi_class);
unregister_chrdev(capi_major, "capi20");
capinc_tty_exit();
}
module_init(capi_init);
module_exit(capi_exit);
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