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authorKarsten Keil <keil@b1-systems.de>2009-04-23 02:24:21 (GMT)
committerDavid S. Miller <davem@davemloft.net>2009-04-27 12:37:39 (GMT)
commit2296e5a0136f7ba64c99f3a48a55a687aa9abcc8 (patch)
treee3eae50d49456ec8f269bbd0a4ed67a6d0d94978 /Documentation/isdn
parent554f200e22a13e19bd407d0037e41be0ec8a0a2e (diff)
Add reference to CAPI 2.0 standard
Move the entry about CAPI 2.0 to the beginning and add a URL. Incorporate changes suggested by Randy Dunlap, thanks for proofreading. Signed-off-by: Karsten Keil <keil@b1-systems.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/isdn')
-rw-r--r--Documentation/isdn/INTERFACE.CAPI20
1 files changed, 13 insertions, 7 deletions
diff --git a/Documentation/isdn/INTERFACE.CAPI b/Documentation/isdn/INTERFACE.CAPI
index 8947ffc..786d619 100644
--- a/Documentation/isdn/INTERFACE.CAPI
+++ b/Documentation/isdn/INTERFACE.CAPI
@@ -3,6 +3,11 @@ Kernel CAPI Interface to Hardware Drivers
1. Overview
+From the CAPI 2.0 specification:
+COMMON-ISDN-API (CAPI) is an application programming interface standard used
+to access ISDN equipment connected to basic rate interfaces (BRI) and primary
+rate interfaces (PRI).
+
Kernel CAPI operates as a dispatching layer between CAPI applications and CAPI
hardware drivers. Hardware drivers register ISDN devices (controllers, in CAPI
lingo) with Kernel CAPI to indicate their readiness to provide their service
@@ -12,6 +17,9 @@ application registration to an available device, forwarding it to the
corresponding hardware driver. Kernel CAPI then forwards CAPI messages in both
directions between the application and the hardware driver.
+Format and semantics of CAPI messages are specified in the CAPI 2.0 standard.
+This standard is freely available from http://www.capi.org.
+
2. Driver and Device Registration
@@ -53,12 +61,10 @@ open() operation on regular files or character devices.
After a successful return from register_appl(), CAPI messages from the
application may be passed to the driver for the device via calls to the
send_message() callback function. The CAPI message to send is stored in the
-data portion of a skb. Conversely, the driver may call Kernel CAPI's
+data portion of an skb. Conversely, the driver may call Kernel CAPI's
capi_ctr_handle_message() function to pass a received CAPI message to Kernel
CAPI for forwarding to an application, specifying its ApplID.
-Format and semantics of CAPI messages are specified in the CAPI 2.0 standard.
-
Deregistration requests (CAPI operation CAPI_RELEASE) from applications are
forwarded as calls to the release_appl() callback function, passing the same
ApplID as with register_appl(). After return from release_appl(), no CAPI
@@ -75,9 +81,9 @@ the following non-private fields, all to be set by the driver before calling
register_capi_driver():
char name[32]
- the name of the driver, as a zero terminated ASCII string
+ the name of the driver, as a zero-terminated ASCII string
char revision[32]
- the revision number of the driver, as a zero terminated ASCII string
+ the revision number of the driver, as a zero-terminated ASCII string
int (*add_card)(struct capi_driver *driver, capicardparams *data)
a callback function pointer (may be NULL)
@@ -100,10 +106,10 @@ void *driverdata
an opaque pointer to driver specific data, not touched by Kernel CAPI
char name[32]
- the name of the controller, as a zero terminated ASCII string
+ the name of the controller, as a zero-terminated ASCII string
char *driver_name
- the name of the driver, as a zero terminated ASCII string
+ the name of the driver, as a zero-terminated ASCII string
int (*load_firmware)(struct capi_ctr *ctrlr, capiloaddata *ldata)
(optional) pointer to a callback function for sending firmware and

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