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From:   Kiran K <kiran.k@intel.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     Kiran K <kiran.k@intel.com>
Subject: [PATCH v13 09/12] Bluetooth: btintel: Define a callback to fetch codec config data
Date:   Tue, 31 Aug 2021 17:26:34 +0530
Message-Id: <20210831115637.6713-9-kiran.k@intel.com>
In-Reply-To: <20210831115637.6713-1-kiran.k@intel.com>
References: <20210831115637.6713-1-kiran.k@intel.com>
Precedence: bulk

Define callback function to get codec config data. In HFP offload
usecase, controllers need to be set codec details before opening SCO.
This callback function is used to fetch vendor specific codec config
data.

Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Reviewed-by: Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
---

Notes:
    * changes in v13:
     - No changes
    
    * changes in v12:
     - No changes
    
    * changes in v11:
     - Remove changes related to Kconfig
    
    * changes in v10:
      - new patch due to refactoring

 drivers/bluetooth/btintel.c | 53 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index 65a3adae8a50..6091b691ddc2 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -2163,6 +2163,55 @@ static int btintel_prepare_fw_download_tlv(struct hci_dev *hdev,
 	return err;
 }
 
+static int btintel_get_codec_config_data(struct hci_dev *hdev,
+					 __u8 link, struct bt_codec *codec,
+					 __u8 *ven_len, __u8 **ven_data)
+{
+	int err = 0;
+
+	if (!ven_data || !ven_len)
+		return -EINVAL;
+
+	*ven_len = 0;
+	*ven_data = NULL;
+
+	if (link != ESCO_LINK) {
+		bt_dev_err(hdev, "Invalid link type(%u)", link);
+		return -EINVAL;
+	}
+
+	*ven_data = kmalloc(sizeof(__u8), GFP_KERNEL);
+	if (!ven_data) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	/* supports only CVSD and mSBC offload codecs */
+	switch (codec->id) {
+	case 0x02:
+		**ven_data = 0x00;
+		break;
+	case 0x05:
+		**ven_data = 0x01;
+		break;
+	default:
+		err = -EINVAL;
+		bt_dev_err(hdev, "Invalid codec id(%u)", codec->id);
+		goto error;
+	}
+	/* codec and its capabilities are pre-defined to ids
+	 * preset id = 0x00 represents CVSD codec with sampling rate 8K
+	 * preset id = 0x01 represents mSBC codec with sampling rate 16K
+	 */
+	*ven_len = sizeof(__u8);
+	return err;
+
+error:
+	kfree(*ven_data);
+	*ven_data = NULL;
+	return err;
+}
+
 static int btintel_get_data_path_id(struct hci_dev *hdev, __u8 *data_path_id)
 {
 	/* Intel uses 1 as data path id for all the usecases */
@@ -2195,8 +2244,10 @@ static int btintel_configure_offload(struct hci_dev *hdev)
 		goto error;
 	}
 
-	if (use_cases->preset[0] & 0x03)
+	if (use_cases->preset[0] & 0x03) {
 		hdev->get_data_path_id = btintel_get_data_path_id;
+		hdev->get_codec_config_data = btintel_get_codec_config_data;
+	}
 error:
 	kfree_skb(skb);
 	return err;
-- 
2.17.1