add infrastructure for zaptel transcoders

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@1162 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 42 insertions, 1 deletions

diff --git a/zaptel.c b/zaptel.c
index 58f723b..8e22356 100644
--- a/zaptel.c
+++ b/zaptel.c
@@ -150,6 +150,7 @@ static char *zt_txlevelnames[] = {
 "-22.5db (CSU)"
 } ;
 
+EXPORT_SYMBOL(zt_transcode_fops);
 EXPORT_SYMBOL(zt_init_tone_state);
 EXPORT_SYMBOL(zt_dtmf_tone);
 EXPORT_SYMBOL(zt_register);
@@ -190,6 +191,7 @@ static devfs_handle_t channel;
 static devfs_handle_t pseudo;
 static devfs_handle_t ctl;
 static devfs_handle_t timer;
+static devfs_handle_t transcode;
 #endif
 
 /* udev necessary data structures.  Yeah! */
@@ -283,6 +285,7 @@ static sumtype *conf_sums_prev;
 
 static struct zt_span *master;
 static struct file_operations zt_fops;
+struct file_operations *zt_transcode_fops = NULL;
 
 static struct
 {
@@ -2389,10 +2392,24 @@ static void zt_free_pseudo(struct zt_chan *pseudo)
 static int zt_open(struct inode *inode, struct file *file)
 {
 	int unit = UNIT(file);
+	int ret = -ENXIO;
 	struct zt_chan *chan;
 	/* Minor 0: Special "control" descriptor */
 	if (!unit) 
 		return zt_ctl_open(inode, file);
+	if (unit == 250) {
+		if (!zt_transcode_fops)
+			request_module("zttranscode");
+		if (zt_transcode_fops && zt_transcode_fops->open) {
+			if (try_module_get(zt_transcode_fops->owner)) {
+				ret = zt_transcode_fops->open(inode, file);
+				if (ret)
+					module_put(zt_transcode_fops->owner);
+			}
+			return ret;
+		}
+		return -ENXIO;
+	}
 	if (unit == 253) {
 		if (maxspans) {
 			return zt_timing_open(inode, file);
@@ -2715,6 +2732,11 @@ static int zt_release(struct inode *inode, struct file *file)
 	if (unit == 253) {
 		return zt_timer_release(inode, file);
 	}
+	if (unit == 250) {
+		res = zt_transcode_fops->release(inode, file);
+		module_put(zt_transcode_fops->owner);
+		return res;
+	}
 	if (unit == 254) {
 		chan = file->private_data;
 		if (!chan)
@@ -4492,6 +4514,10 @@ static int zt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, un
 
 	if (!unit)
 		return zt_ctl_ioctl(inode, file, cmd, data);
+
+	if (unit == 250)
+		return zt_transcode_fops->ioctl(inode, file, cmd, data);
+
 	if (unit == 253) {
 		timer = file->private_data;
 		if (timer)
@@ -6369,6 +6395,14 @@ zt_chan_poll(struct file *file, struct poll_table_struct *wait_table, int unit)
 	return(ret);  /* return what we found */
 }
 
+static int zt_mmap(struct file *file, struct vm_area_struct *vm)
+{
+	int unit = UNIT(file);
+	if (unit == 250)
+		return zt_transcode_fops->mmap(file, vm);
+	return -ENOSYS;
+}
+
 static unsigned int zt_poll(struct file *file, struct poll_table_struct *wait_table)
 {
 	int unit = UNIT(file);
@@ -6377,6 +6411,9 @@ static unsigned int zt_poll(struct file *file, struct poll_table_struct *wait_ta
 	if (!unit)
 		return -EINVAL;
 
+	if (unit == 250)
+		return zt_transcode_fops->poll(file, wait_table);
+
 	if (unit == 253)
 		return zt_timer_poll(file, wait_table);
 		
@@ -6758,7 +6795,7 @@ static struct file_operations zt_fops = {
 	read: zt_read,
 	write: zt_write,
 	poll: zt_poll,
-	mmap: NULL,
+	mmap: zt_mmap,
 	flush: NULL,
 	fsync: NULL,
 	fasync: NULL,
@@ -6833,6 +6870,7 @@ static int __init zt_init(void) {
 
 #ifdef CONFIG_ZAP_UDEV /* udev support functions */
 	zap_class = class_create(THIS_MODULE, "zaptel");
+	CLASS_DEV_CREATE(zap_class, MKDEV(ZT_MAJOR, 250), NULL, "zaptranscode");
 	CLASS_DEV_CREATE(zap_class, MKDEV(ZT_MAJOR, 253), NULL, "zaptimer");
 	CLASS_DEV_CREATE(zap_class, MKDEV(ZT_MAJOR, 254), NULL, "zapchannel");
 	CLASS_DEV_CREATE(zap_class, MKDEV(ZT_MAJOR, 255), NULL, "zappseudo");
@@ -6848,6 +6886,7 @@ static int __init zt_init(void) {
 	timer = devfs_register(zaptel_devfs_dir, "timer", DEVFS_FL_DEFAULT, ZT_MAJOR, 253, mode, &zt_fops, NULL);
 	channel = devfs_register(zaptel_devfs_dir, "channel", DEVFS_FL_DEFAULT, ZT_MAJOR, 254, mode, &zt_fops, NULL);
 	pseudo = devfs_register(zaptel_devfs_dir, "pseudo", DEVFS_FL_DEFAULT, ZT_MAJOR, 255, mode, &zt_fops, NULL);
+	transcode = devfs_register(zaptel_devfs_dir, "transcode", DEVFS_FL_DEFAULT, ZT_MAJOR, 250, mode, &zt_fops, NULL);
 	ctl = devfs_register(zaptel_devfs_dir, "ctl", DEVFS_FL_DEFAULT, ZT_MAJOR, 0, mode, &zt_fops, NULL);
 	}
 #else
@@ -6884,6 +6923,7 @@ static void __exit zt_cleanup(void) {
 			kfree(tone_zones[x]);
 #ifdef CONFIG_DEVFS_FS
 	devfs_unregister(timer);
+	devfs_unregister(transcode);
 	devfs_unregister(channel);
 	devfs_unregister(pseudo);
 	devfs_unregister(ctl);
@@ -6891,6 +6931,7 @@ static void __exit zt_cleanup(void) {
 	devfs_unregister_chrdev(ZT_MAJOR, "zaptel");
 #else
 #ifdef CONFIG_ZAP_UDEV
+	class_device_destroy(zap_class, MKDEV(ZT_MAJOR, 250)); /* transcode */
 	class_device_destroy(zap_class, MKDEV(ZT_MAJOR, 253)); /* timer */
 	class_device_destroy(zap_class, MKDEV(ZT_MAJOR, 254)); /* channel */
 	class_device_destroy(zap_class, MKDEV(ZT_MAJOR, 255)); /* pseudo */