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authorRob Herring <robh@kernel.org>2017-02-02 13:48:05 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-03 10:17:02 +0100
commitc3485ee0d560b182e1e0f67d67246718739f0782 (patch)
treedb88cef8a824e3de3d40950e84bd816534719704 /include/linux/tty.h
parenta380ed461f66d1b843cf13380a43a5fe790b8430 (diff)
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tty_port: Add port client functions
Introduce a client (upward direction) operations struct for tty_port clients. Initially supported operations are for receiving data and write wake-up. This will allow for having clients other than an ldisc. Convert the calls to the ldisc to use the client ops as the default operations. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-By: Sebastian Reichel <sre@kernel.org> Tested-By: Sebastian Reichel <sre@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/tty.h')
-rw-r--r--include/linux/tty.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 21c0fab..1017e904 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -217,12 +217,18 @@ struct tty_port_operations {
/* Called on the final put of a port */
void (*destruct)(struct tty_port *port);
};
-
+
+struct tty_port_client_operations {
+ int (*receive_buf)(struct tty_port *port, const unsigned char *, const unsigned char *, size_t);
+ void (*write_wakeup)(struct tty_port *port);
+};
+
struct tty_port {
struct tty_bufhead buf; /* Locked internally */
struct tty_struct *tty; /* Back pointer */
struct tty_struct *itty; /* internal back ptr */
const struct tty_port_operations *ops; /* Port operations */
+ const struct tty_port_client_operations *client_ops; /* Port client operations */
spinlock_t lock; /* Lock protecting tty field */
int blocked_open; /* Waiting to open */
int count; /* Usage count */
@@ -241,6 +247,7 @@ struct tty_port {
based drain is needed else
set to size of fifo */
struct kref kref; /* Ref counter */
+ void *client_data;
};
/* tty_port::iflags bits -- use atomic bit ops */
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