--- /dev/null
+/* $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 {
+ 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(&n->list);
+ spin_lock_bh(&mp->ackqlock);
+ list_add_tail(&n->list, &mp->ackqueue);
+ mp->nack++;
+ spin_unlock_bh(&mp->ackqlock);
+ return 0;
+}
+
+static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
+{
+ struct ackqueue_entry *p, *tmp;
+
+ spin_lock_bh(&mp->ackqlock);
+ list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
+ if (p->datahandle == datahandle) {
+ list_del(&p->list);
+ mp->nack--;
+ spin_unlock_bh(&mp->ackqlock);
+ kfree(p);
+ return 0;
+ }
+ }
+ spin_unlock_bh(&mp->ackqlock);
+ return -1;
+}
+
+static void capiminor_del_all_ack(struct capiminor *mp)
+{
+ struct ackqueue_entry *p, *tmp;
+
+ list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
+ list_del(&p->list);
+ kfree(p);
+ mp->nack--;
+ }
+}
+
+
+/* -------- struct capiminor ---------------------------------------- */
+
+static void capiminor_destroy(struct tty_port *port)
+{
+ struct capiminor *mp = container_of(port, struct capiminor, port);
+
+ kfree_skb(mp->outskb);
+ skb_queue_purge(&mp->inqueue);
+ skb_queue_purge(&mp->outqueue);
+ capiminor_del_all_ack(mp);
+ kfree(mp);
+}
+
+static const struct tty_port_operations capiminor_port_ops = {
+ .destruct = capiminor_destroy,
+};
+
+static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
+{
+ struct capiminor *mp;
+ struct device *dev;
+ unsigned int minor;
+
+ mp = kzalloc(sizeof(*mp), GFP_KERNEL);
+ if (!mp) {
+ printk(KERN_ERR "capi: can't alloc capiminor\n");
+ return NULL;
+ }
+
+ mp->ap = ap;
+ mp->ncci = ncci;
+ INIT_LIST_HEAD(&mp->ackqueue);
+ spin_lock_init(&mp->ackqlock);
+
+ skb_queue_head_init(&mp->inqueue);
+ skb_queue_head_init(&mp->outqueue);
+ spin_lock_init(&mp->outlock);
+
+ tty_port_init(&mp->port);
+ mp->port.ops = &capiminor_port_ops;
+
+ /* Allocate the least unused minor number. */
+ spin_lock(&capiminors_lock);
+ for (minor = 0; minor < capi_ttyminors; minor++)
+ if (!capiminors[minor]) {
+ capiminors[minor] = mp;
+ break;
+ }
+ spin_unlock(&capiminors_lock);
+
+ if (minor == capi_ttyminors) {
+ printk(KERN_NOTICE "capi: out of minors\n");
+ goto err_out1;
+ }
+
+ mp->minor = minor;
+
+ dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
+ NULL);
+ if (IS_ERR(dev))
+ goto err_out2;
+
+ return mp;
+
+err_out2:
+ spin_lock(&capiminors_lock);
+ capiminors[minor] = NULL;
+ spin_unlock(&capiminors_lock);
+
+err_out1:
+ tty_port_put(&mp->port);
+ return NULL;
+}
+
+static struct capiminor *capiminor_get(unsigned int minor)
+{
+ struct capiminor *mp;
+
+ spin_lock(&capiminors_lock);
+ mp = capiminors[minor];
+ if (mp)
+ tty_port_get(&mp->port);
+ spin_unlock(&capiminors_lock);
+
+ return mp;
+}
+
+static inline void capiminor_put(struct capiminor *mp)
+{
+ tty_port_put(&mp->port);
+}
+
+static void capiminor_free(struct capiminor *mp)
+{
+ tty_unregister_device(capinc_tty_driver, mp->minor);
+
+ spin_lock(&capiminors_lock);
+ capiminors[mp->minor] = NULL;
+ spin_unlock(&capiminors_lock);
+
+ capiminor_put(mp);
+}
+
+/* -------- struct capincci ----------------------------------------- */
+
+static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
+{
+ if (cdev->userflags & CAPIFLAG_HIGHJACKING)
+ np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
+}
+
+static void capincci_free_minor(struct capincci *np)
+{
+ struct capiminor *mp = np->minorp;
+ struct tty_struct *tty;
+
+ if (mp) {
+ 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;
+ unsigned int count = 0;
+ struct tty_struct *tty;
+
+ if (mp) {
+ tty = tty_port_tty_get(&mp->port);
+ if (tty) {
+ count = tty->count;
+ tty_kref_put(tty);
+ }
+ }
+ return count;
+}
+
+#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) { }
+
+#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);
+ }
+}
+
+#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
+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;
+}
+
+/* -------- 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_KERNEL);
+ 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, atomic_inc_return(&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)
+{
+ unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
+ struct tty_struct *tty;
+ struct sk_buff *nskb;
+ u16 errcode, datahandle;
+ struct tty_ldisc *ld;
+ int ret = -1;
+
+ tty = tty_port_tty_get(&mp->port);
+ if (!tty) {
+ pr_debug("capi: currently no receiver\n");
+ return -1;
+ }
+
+ ld = tty_ldisc_ref(tty);
+ if (!ld) {
+ /* fatal error, do not requeue */
+ ret = 0;
+ kfree_skb(skb);
+ goto deref_tty;
+ }
+
+ if (ld->ops->receive_buf == NULL) {
+ pr_debug("capi: ldisc has no receive_buf function\n");
+ /* fatal error, do not requeue */
+ goto free_skb;
+ }
+ if (mp->ttyinstop) {
+ pr_debug("capi: recv tty throttled\n");
+ goto deref_ldisc;
+ }
+
+ if (tty->receive_room < datalen) {
+ pr_debug("capi: no room in tty\n");
+ goto deref_ldisc;
+ }
+
+ nskb = gen_data_b3_resp_for(mp, skb);
+ if (!nskb) {
+ printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
+ goto deref_ldisc;
+ }
+
+ datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
+
+ errcode = capi20_put_message(mp->ap, nskb);
+
+ if (errcode == CAPI_NOERROR) {
+ skb_pull(skb, CAPIMSG_LEN(skb->data));
+ pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
+ datahandle, skb->len);
+ ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
+ } else {
+ printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
+ errcode);
+ kfree_skb(nskb);
+
+ if (errcode == CAPI_SENDQUEUEFULL)
+ goto deref_ldisc;
+ }
+
+free_skb:
+ ret = 0;
+ kfree_skb(skb);
+
+deref_ldisc:
+ tty_ldisc_deref(ld);
+
+deref_tty:
+ 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)
+ if (handle_recv_skb(mp, skb) < 0) {
+ skb_queue_head(&mp->inqueue, skb);
+ return;
+ }
+}
+
+static void handle_minor_send(struct capiminor *mp)
+{
+ struct tty_struct *tty;
+ struct sk_buff *skb;
+ u16 len;
+ u16 errcode;
+ u16 datahandle;
+
+ tty = tty_port_tty_get(&mp->port);
+ if (!tty)
+ return;
+
+ if (mp->ttyoutstop) {
+ pr_debug("capi: send: tty stopped\n");
+ tty_kref_put(tty);
+ return;
+ }
+
+ while (1) {
+ spin_lock_bh(&mp->outlock);
+ skb = __skb_dequeue(&mp->outqueue);
+ if (!skb) {
+ spin_unlock_bh(&mp->outlock);
+ break;
+ }
+ len = (u16)skb->len;
+ mp->outbytes -= len;
+ spin_unlock_bh(&mp->outlock);
+
+ datahandle = atomic_inc_return(&mp->datahandle);
+ 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, atomic_inc_return(&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);
+
+ spin_lock_bh(&mp->outlock);
+ __skb_queue_head(&mp->outqueue, skb);
+ mp->outbytes += len;
+ spin_unlock_bh(&mp->outlock);
+
+ break;
+ }
+ errcode = capi20_put_message(mp->ap, skb);
+ if (errcode == CAPI_NOERROR) {
+ pr_debug("capi: DATA_B3_REQ %u len=%u\n",
+ datahandle, len);
+ continue;
+ }
+ capiminor_del_ack(mp, datahandle);
+
+ if (errcode == CAPI_SENDQUEUEFULL) {
+ skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
+
+ spin_lock_bh(&mp->outlock);
+ __skb_queue_head(&mp->outqueue, skb);
+ mp->outbytes += len;
+ spin_unlock_bh(&mp->outlock);
+
+ break;
+ }
+
+ /* ups, drop packet */
+ printk(KERN_ERR "capi: put_message = %x\n", errcode);
+ kfree_skb(skb);
+ }
+ tty_kref_put(tty);
+}
+
+#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 capiminor *mp;
+ u16 datahandle;
+ struct capincci *np;
+#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
+
+ 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));
+
+ if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
+ 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 */
+
+ 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;
+ }
+
+ 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);
+ pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
+ datahandle, skb->len-CAPIMSG_LEN(skb->data));
+ skb_queue_tail(&mp->inqueue, skb);
+
+ handle_minor_recv(mp);
+
+ } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
+
+ datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
+ pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
+ datahandle,
+ CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
+ kfree_skb(skb);
+ capiminor_del_ack(mp, datahandle);
+ tty_port_tty_wakeup(&mp->port);
+ 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:
+ 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 = 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 = 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 = 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 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);
+ }
+ 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;
+
+#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
+ case CAPI_NCCI_OPENCOUNT:
+ return 0;
+
+#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
+ 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;
+ }
+
+ 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 long
+capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int ret;
+
+ mutex_lock(&capi_mutex);
+ ret = capi_ioctl(file, cmd, arg);
+ mutex_unlock(&capi_mutex);
+
+ return ret;
+}
+
+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,
+ .unlocked_ioctl = capi_unlocked_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)
+{
+ struct capiminor *mp = capiminor_get(tty->index);
+ int ret = tty_standard_install(driver, tty);
+
+ if (ret == 0)
+ tty->driver_data = mp;
+ 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;
+ int err;
+
+ err = tty_port_open(&mp->port, tty, filp);
+ if (err)
+ return err;
+
+ handle_minor_recv(mp);
+ return 0;
+}
+
+static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
+{
+ struct capiminor *mp = tty->driver_data;
+
+ 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;
+
+ pr_debug("capinc_tty_write(count=%d)\n", count);
+
+ spin_lock_bh(&mp->outlock);
+ skb = mp->outskb;
+ if (skb) {
+ mp->outskb = 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_bh(&mp->outlock);
+ 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;
+ spin_unlock_bh(&mp->outlock);
+
+ handle_minor_send(mp);
+
+ return count;
+}
+
+static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ struct capiminor *mp = tty->driver_data;
+ bool invoke_send = false;
+ struct sk_buff *skb;
+ int ret = 1;
+
+ pr_debug("capinc_put_char(%u)\n", ch);
+
+ spin_lock_bh(&mp->outlock);
+ skb = mp->outskb;
+ if (skb) {
+ if (skb_tailroom(skb) > 0) {
+ *(skb_put(skb, 1)) = ch;
+ goto unlock_out;
+ }
+ mp->outskb = NULL;
+ __skb_queue_tail(&mp->outqueue, skb);
+ mp->outbytes += skb->len;
+ invoke_send = true;
+ }
+
+ 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->outskb = skb;
+ } else {
+ printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
+ ret = 0;
+ }
+
+unlock_out:
+ spin_unlock_bh(&mp->outlock);
+
+ if (invoke_send)
+ handle_minor_send(mp);
+
+ return ret;
+}
+
+static void capinc_tty_flush_chars(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+ struct sk_buff *skb;
+
+ pr_debug("capinc_tty_flush_chars\n");
+
+ spin_lock_bh(&mp->outlock);
+ skb = mp->outskb;
+ if (skb) {
+ mp->outskb = NULL;
+ __skb_queue_tail(&mp->outqueue, skb);
+ mp->outbytes += skb->len;
+ spin_unlock_bh(&mp->outlock);
+
+ handle_minor_send(mp);
+ } else
+ spin_unlock_bh(&mp->outlock);
+
+ handle_minor_recv(mp);
+}
+
+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;
+ pr_debug("capinc_tty_write_room = %d\n", room);
+ return room;
+}
+
+static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+
+ pr_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));
+ return mp->outbytes;
+}
+
+static int capinc_tty_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ return -ENOIOCTLCMD;
+}
+
+static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+ pr_debug("capinc_tty_set_termios\n");
+}
+
+static void capinc_tty_throttle(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+ pr_debug("capinc_tty_throttle\n");
+ mp->ttyinstop = 1;
+}
+
+static void capinc_tty_unthrottle(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+
+ pr_debug("capinc_tty_unthrottle\n");
+ mp->ttyinstop = 0;
+ handle_minor_recv(mp);
+}
+
+static void capinc_tty_stop(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+
+ pr_debug("capinc_tty_stop\n");
+ mp->ttyoutstop = 1;
+}
+
+static void capinc_tty_start(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+
+ pr_debug("capinc_tty_start\n");
+ mp->ttyoutstop = 0;
+ handle_minor_send(mp);
+}
+
+static void capinc_tty_hangup(struct tty_struct *tty)
+{
+ struct capiminor *mp = tty->driver_data;
+
+ pr_debug("capinc_tty_hangup\n");
+ tty_port_hangup(&mp->port);
+}
+
+static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
+{
+ pr_debug("capinc_tty_break_ctl(%d)\n", state);
+ return 0;
+}
+
+static void capinc_tty_flush_buffer(struct tty_struct *tty)
+{
+ pr_debug("capinc_tty_flush_buffer\n");
+}
+
+static void capinc_tty_set_ldisc(struct tty_struct *tty)
+{
+ pr_debug("capinc_tty_set_ldisc\n");
+}
+
+static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
+{
+ pr_debug("capinc_tty_send_xchar(%d)\n", ch);
+}
+
+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 capiminor *) * capi_ttyminors,
+ GFP_KERNEL);
+ if (!capiminors)
+ return -ENOMEM;
+
+ drv = alloc_tty_driver(capi_ttyminors);
+ if (!drv) {
+ kfree(capiminors);
+ return -ENOMEM;
+ }
+ 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, "capi20");
+
+ 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();
+
+#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
+ compileinfo = " (middleware)";
+#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);
Code Review / kvmfornfv.git / blobdiff