Bluetooth: btintel: Add Device Configuration support

btintel_load_ddc_config retrieves the ddc file and sends its content
via DDC commands (opcode 0xfc8b).

The ddc file should contain one or more DDC structures.
A DDC structure is composed of the folowing fields:
field: | DDC LEN |    DDC ID    |   DDC VALUE   |
size:  | 1 byte  |    2 bytes   |  DDC LEN - 2  |

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index 048423fd83bf8cc5b17df1bff18d90dea826b877..9e18988375eb36b39ec9d9a762a381346aff5316 100644 (file)
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -22,6 +22,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/firmware.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -169,6 +170,51 @@ int btintel_secure_send(struct hci_dev *hdev, u8 fragment_type, u32 plen,
 }
 EXPORT_SYMBOL_GPL(btintel_secure_send);
 
+int btintel_load_ddc_config(struct hci_dev *hdev, const char *ddc_name)
+{
+       const struct firmware *fw;
+       struct sk_buff *skb;
+       const u8 *fw_ptr;
+       int err;
+
+       err = request_firmware_direct(&fw, ddc_name, &hdev->dev);
+       if (err < 0) {
+               bt_dev_err(hdev, "Failed to load Intel DDC file %s (%d)",
+                          ddc_name, err);
+               return err;
+       }
+
+       bt_dev_info(hdev, "Found Intel DDC parameters: %s", ddc_name);
+
+       fw_ptr = fw->data;
+
+       /* DDC file contains one or more DDC structure which has
+        * Length (1 byte), DDC ID (2 bytes), and DDC value (Length - 2).
+        */
+       while (fw->size > fw_ptr - fw->data) {
+               u8 cmd_plen = fw_ptr[0] + sizeof(u8);
+
+               skb = __hci_cmd_sync(hdev, 0xfc8b, cmd_plen, fw_ptr,
+                                    HCI_INIT_TIMEOUT);
+               if (IS_ERR(skb)) {
+                       bt_dev_err(hdev, "Failed to send Intel_Write_DDC (%ld)",
+                                  PTR_ERR(skb));
+                       release_firmware(fw);
+                       return PTR_ERR(skb);
+               }
+
+               fw_ptr += cmd_plen;
+               kfree_skb(skb);
+       }
+
+       release_firmware(fw);
+
+       bt_dev_info(hdev, "Applying Intel DDC parameters completed");
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(btintel_load_ddc_config);
+
 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 MODULE_DESCRIPTION("Bluetooth support for Intel devices ver " VERSION);
 MODULE_VERSION(VERSION);

diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h
index a49c8dbbb4b75c18e309d5ee2bd100bfc8469582..52deaf2817cf1564da92e8dde268f3fa7c303ae4 100644 (file)
--- a/drivers/bluetooth/btintel.h
+++ b/drivers/bluetooth/btintel.h
@@ -78,6 +78,7 @@ void btintel_hw_error(struct hci_dev *hdev, u8 code);
 void btintel_version_info(struct hci_dev *hdev, struct intel_version *ver);
 int btintel_secure_send(struct hci_dev *hdev, u8 fragment_type, u32 plen,
                        const void *param);
+int btintel_load_ddc_config(struct hci_dev *hdev, const char *ddc_name);
 
 #else
 
@@ -106,4 +107,10 @@ static inline int btintel_secure_send(struct hci_dev *hdev, u8 fragment_type,
        return -EOPNOTSUPP;
 }
 
+static inline int btintel_load_ddc_config(struct hci_dev *hdev,
+                                         const char *ddc_name)
+{
+       return -EOPNOTSUPP;
+}
+
 #endif