/* $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 * * This software may be used and distributed according to the terms * of the GNU General Public License, incorporated herein by reference. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 __poll_t capi_poll(struct file *file, poll_table *wait) { struct capidev *cdev = file->private_data; __poll_t mask = 0; if (!cdev->ap.applid) return EPOLLERR; poll_wait(file, &(cdev->recvwait), wait); mask = EPOLLOUT | EPOLLWRNORM; if (!skb_queue_empty(&cdev->recvqueue)) mask |= EPOLLIN | EPOLLRDNORM; 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); skb_put_data(skb, 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_u8(skb, 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_u8(skb, 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 = kcalloc(capi_ttyminors, sizeof(struct capiminor *), 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; } /* * /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 void __init proc_init(void) { proc_create_single("capi/capi20", 0, NULL, capi20_proc_show); proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show); } 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);