This function allows to send a HCI command without expecting any
controller event/response in return. This is allowed for vendor-
specific commands only.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
---
v2: Only allow vendor-specific command to be unresponded
Rename function to __hci_cmd_send
v3: no change
include/net/bluetooth/hci_core.h | 2 ++
net/bluetooth/hci_core.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index b619a19..893bbbb 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1393,6 +1393,8 @@ struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param, u32 timeout);
struct sk_buff *__hci_cmd_sync_ev(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param, u8 event, u32 timeout);
+int __hci_cmd_send(struct hci_dev *hdev, u16 opcode, u32 plen,
+ const void *param);
int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen,
const void *param);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 40d260f..b0ee9ed 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3422,6 +3422,37 @@ int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen,
return 0;
}
+int __hci_cmd_send(struct hci_dev *hdev, u16 opcode, u32 plen,
+ const void *param)
+{
+ struct sk_buff *skb;
+
+ if (hci_opcode_ogf(opcode) != 0x3f) {
+ /* A controller receiving a command shall respond with either
+ * a Command Status Event or a Command Complete Event.
+ * Therefore, all standard HCI commands must be sent via the
+ * standard API, using hci_send_cmd or hci_cmd_sync helpers.
+ * Some vendors do not comply with this rule for vendor-specific
+ * commands and do not return any event. We want to support
+ * unresponded commands for such cases only.
+ */
+ bt_dev_err(hdev, "unresponded command not supported");
+ return -EINVAL;
+ }
+
+ skb = hci_prepare_cmd(hdev, opcode, plen, param);
+ if (!skb) {
+ bt_dev_err(hdev, "no memory for command (opcode 0x%4.4x)",
+ opcode);
+ return -ENOMEM;
+ }
+
+ hci_send_frame(hdev, skb);
+
+ return 0;
+}
+EXPORT_SYMBOL(__hci_cmd_send);
+
/* Get data from the previously sent command */
void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
{
--
2.7.4
--
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