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From:   Kiran K <kiran.k@intel.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     Kiran K <kiran.k@intel.com>,
        Chethan T N <chethan.tumkur.narayan@intel.com>,
        Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
Subject: [PATCH v7 2/2] Bluetooth: Add support for Read Local Supported Codecs V2
Date:   Fri,  7 May 2021 17:12:30 +0530
Message-Id: <20210507114230.22919-2-kiran.k@intel.com>
In-Reply-To: <20210507114230.22919-1-kiran.k@intel.com>
References: <20210507114230.22919-1-kiran.k@intel.com>
Precedence: bulk

Use V2 version of read local supported command is controller
supports

snoop:
> HCI Event: Command Complete (0x0e) plen 20
      Read Local Supported Codecs V2 (0x04|0x000d) ncmd 1
        Status: Success (0x00)
        Number of supported codecs: 7
          Codec: u-law log (0x00)
          Logical Transport Type: 0x02
            Codec supported over BR/EDR SCO and eSCO
          Codec: A-law log (0x01)
          Logical Transport Type: 0x02
            Codec supported over BR/EDR SCO and eSCO
          Codec: CVSD (0x02)
          Logical Transport Type: 0x02
            Codec supported over BR/EDR SCO and eSCO
          Codec: Transparent (0x03)
          Logical Transport Type: 0x02
            Codec supported over BR/EDR SCO and eSCO
          Codec: Linear PCM (0x04)
          Logical Transport Type: 0x02
            Codec supported over BR/EDR SCO and eSCO
          Codec: Reserved (0x08)
          Logical Transport Type: 0x03
            Codec supported over BR/EDR ACL
            Codec supported over BR/EDR SCO and eSCO
          Codec: mSBC (0x05)
          Logical Transport Type: 0x03
            Codec supported over BR/EDR ACL
            Codec supported over BR/EDR SCO and eSCO
        Number of vendor codecs: 0
......
< HCI Command: Read Local Suppor.. (0x04|0x000e) plen 7
        Codec: mSBC (0x05)
        Logical Transport Type: 0x00
        Direction: Input (Host to Controller) (0x00)
> HCI Event: Command Complete (0x0e) plen 12
      Read Local Supported Codec Capabilities (0x04|0x000e) ncmd 1
        Status: Success (0x00)
        Number of codec capabilities: 1
         Capabilities #0:
        00 00 11 15 02 33

Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
---
* changes in v7:
  call codec enumeration code in hci_init instead of having it in a separate
  function

* changes in v6
  no changes

* changes in v5:
  fix review comments

* changes in v4:
  converts codec read capabilities calls from async to sync

* changes in v3:
  No changes

* changes in v2:
  add length check for event data before accessing

 include/net/bluetooth/hci.h | 28 ++++++++++++++
 net/bluetooth/hci_core.c    | 76 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 103 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 901603e8b4ed..b36ac8512a11 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1335,6 +1335,34 @@ struct hci_rp_read_local_pairing_opts {
 	__u8     max_key_size;
 } __packed;
 
+#define HCI_OP_READ_LOCAL_CODECS_V2	0x100d
+struct hci_standard_codec_v2 {
+	__u8	codec_id;
+	__u8	transport;
+} __packed;
+
+struct hci_standard_codecs_v2 {
+	__u8	num;
+	struct hci_standard_codec_v2 codec[];
+} __packed;
+
+struct hci_vendor_codec_v2 {
+	__le16	company_id;
+	__le16	vendor_id;
+	__u8	transport;
+} __packed;
+
+struct hci_vendor_codecs_v2 {
+	__u8	num;
+	struct hci_vendor_codec_v2 codec[];
+} __packed;
+
+struct hci_rp_read_local_supported_codecs_v2 {
+	__u8	status;
+	struct hci_standard_codecs_v2 std_codecs;
+	struct hci_vendor_codecs_v2 vendor_codecs;
+} __packed;
+
 #define HCI_OP_READ_LOCAL_CODEC_CAPS	0x100e
 struct hci_op_read_local_codec_caps {
 	__u8	codec_id[5];
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 50947a1ed6a9..debb9f871479 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1006,6 +1006,28 @@ static void hci_codec_list_parse(struct hci_dev *hdev, __u8 num_codecs,
 	}
 }
 
+static void hci_codec_list_parse_v2(struct hci_dev *hdev, __u8 num_codecs,
+				    void *codec_list, bool is_vendor_codec)
+{
+	__u8 i;
+
+	for (i = 0; i < num_codecs; i++) {
+		if (!is_vendor_codec) {
+			struct hci_standard_codecs_v2 *codecs = codec_list;
+
+			hci_read_codec_capabilities(hdev, &codecs->codec[i],
+						    codecs->codec[i].transport,
+						    is_vendor_codec);
+		} else {
+			struct hci_vendor_codecs_v2 *codecs = codec_list;
+
+			hci_read_codec_capabilities(hdev, &codecs->codec[i],
+						    codecs->codec[i].transport,
+						    is_vendor_codec);
+		}
+	}
+}
+
 static void hci_read_supported_codecs(struct hci_dev *hdev)
 {
 	struct sk_buff *skb;
@@ -1056,6 +1078,56 @@ static void hci_read_supported_codecs(struct hci_dev *hdev)
 	kfree_skb(skb);
 }
 
+static void hci_read_supported_codecs_v2(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	struct hci_rp_read_local_supported_codecs_v2 *rp;
+	struct hci_standard_codecs_v2 *std_codecs;
+	struct hci_vendor_codecs_v2 *vendor_codecs;
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS_V2, 0, NULL,
+			     HCI_CMD_TIMEOUT);
+
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
+			   PTR_ERR(skb));
+		return;
+	}
+
+	if (skb->len < sizeof(*rp))
+		goto error;
+
+	rp = (void *)skb->data;
+
+	if (rp->status)
+		goto error;
+
+	skb_pull(skb, sizeof(rp->status));
+
+	std_codecs = (void *)skb->data;
+
+	if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
+	    + sizeof(std_codecs->num))
+		goto error;
+
+	hci_codec_list_parse_v2(hdev, std_codecs->num, std_codecs, false);
+
+	skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
+		 + sizeof(std_codecs->num));
+
+	vendor_codecs = (void *)skb->data;
+
+	if (skb->len <
+	    flex_array_size(vendor_codecs, codec, vendor_codecs->num)
+	    + sizeof(vendor_codecs->num))
+		goto error;
+
+	hci_codec_list_parse_v2(hdev, vendor_codecs->num, vendor_codecs, true);
+
+error:
+	kfree_skb(skb);
+}
+
 static int __hci_init(struct hci_dev *hdev)
 {
 	int err;
@@ -1087,7 +1159,9 @@ static int __hci_init(struct hci_dev *hdev)
 		return err;
 
 	/* Read local codec list if the HCI command is supported */
-	if (hdev->commands[29] & 0x20)
+	if (hdev->commands[45] & 0x04)
+		hci_read_supported_codecs_v2(hdev);
+	else if (hdev->commands[29] & 0x20)
 		hci_read_supported_codecs(hdev);
 
 	/* This function is only called when the controller is actually in
-- 
2.17.1