Bluetooth: Add __hci_cmd_send function

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@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index b619a19..893bbbb 100644 (file)
--- 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 (file)
--- 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)
 {