[RFCv4 11/30] Bluetooth: A2MP: Build and Send msg helpers

Andrei Emeltchenko
2012-03-15T12:30:02Z

Helper function to build and send A2MP messages.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
---
include/net/bluetooth/a2mp.h | 7 ++++++
net/bluetooth/a2mp.c | 49 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+), 0 deletions(-)

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 63970b5..19a8ac3 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -16,6 +16,54 @@
#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 inline int __a2mp_send(struct amp_mgr *mgr, u8 *data, int len)
+{
+ struct l2cap_chan *chan = mgr->a2mp_chan;
+ struct kvec iv = { data, len };
+ struct msghdr msg;
+
+ memset(&msg, 0, sizeof(msg));
+
+ msg.msg_iov = (struct iovec *) &iv;
+ msg.msg_iovlen = 1;
+
+ return chan->ops->send(chan, &msg, len, 0);
+}
+
+static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len,
+ void *data)
+{
+ struct a2mp_cmd *cmd;
+
+ cmd = __a2mp_build(code, ident, len, data);
+ if (!cmd)
+ return;
+
+ __a2mp_send(mgr, (u8 *)cmd, len + sizeof(*cmd));
+
+ kfree(cmd);
+}
+
static void a2mp_chan_state_change_cb(void *data, int state, int err)
{
struct l2cap_chan *chan = data;
@@ -44,6 +92,7 @@ static void a2mp_chan_close_cb(void *data)
static struct l2cap_ops a2mp_chan_ops = {
.name = "L2CAP A2MP channel",
.close = a2mp_chan_close_cb,
+ .send = l2cap_chan_send,
.state_change = a2mp_chan_state_change_cb,
};

--
1.7.9.1