diff options
Diffstat (limited to 'drivers/isdn/capi/capi.c')
| -rw-r--r-- | drivers/isdn/capi/capi.c | 1437 |
1 files changed, 1437 insertions, 0 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c new file mode 100644 index 000000000..c67fd2fb3 --- /dev/null +++ b/drivers/isdn/capi/capi.c @@ -0,0 +1,1437 @@ +/* $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/compiler.h> +#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; + + if (count < CAPIMSG_BASELEN) + return -EINVAL; + + 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 (count < CAPI_DATA_B3_REQ_LEN || + (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) { + if (count < CAPI_DISCONNECT_B3_RESP_LEN) { + kfree_skb(skb); + return -EINVAL; + } + 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_lockless(&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 __maybe_unused 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 __maybe_unused 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); |