From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
Helper function to build and send A2MP messages.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
include/net/bluetooth/a2mp.h | 7 +++++++
net/bluetooth/a2mp.c | 46 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+)
diff --git a/include/net/bluetooth/a2mp.h b/include/net/bluetooth/a2mp.h
index 0fe8ddd..995f1c0 100644
--- a/include/net/bluetooth/a2mp.h
+++ b/include/net/bluetooth/a2mp.h
@@ -24,6 +24,13 @@ struct amp_mgr {
unsigned long flags;
};
+struct a2mp_cmd {
+ __u8 code;
+ __u8 ident;
+ __le16 len;
+ __u8 data[0];
+} __packed;
+
void amp_mgr_get(struct amp_mgr *mgr);
int amp_mgr_put(struct amp_mgr *mgr);
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 85cd29a..cb3bf74 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -17,6 +17,52 @@
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/a2mp.h>
+/* A2MP build & send command helper functions */
+static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
+{
+ struct a2mp_cmd *cmd;
+ int plen;
+
+ plen = sizeof(*cmd) + len;
+ cmd = kzalloc(plen, GFP_KERNEL);
+ if (!cmd)
+ return NULL;
+
+ cmd->code = code;
+ cmd->ident = ident;
+ cmd->len = cpu_to_le16(len);
+
+ memcpy(cmd->data, data, len);
+
+ return cmd;
+}
+
+static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len,
+ void *data)
+{
+ struct l2cap_chan *chan = mgr->a2mp_chan;
+ struct a2mp_cmd *cmd;
+ u16 total_len = len + sizeof(*cmd);
+ struct kvec iv;
+ struct msghdr msg;
+
+ cmd = __a2mp_build(code, ident, len, data);
+ if (!cmd)
+ return;
+
+ iv.iov_base = cmd;
+ iv.iov_len = total_len;
+
+ memset(&msg, 0, sizeof(msg));
+
+ msg.msg_iov = (struct iovec *) &iv;
+ msg.msg_iovlen = 1;
+
+ l2cap_chan_send(chan, &msg, total_len, 0);
+
+ kfree(cmd);
+}
+
static struct l2cap_ops a2mp_chan_ops = {
.name = "L2CAP A2MP channel",
};
--
1.7.9.5
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