Add BT_CODEC option for getsockopt systemcall to get the details
of offload codecs supported over SCO socket
Signed-off-by: Kiran K <kiran.k@xxxxxxxxx>
Reviewed-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
Reviewed-by: Srivatsa Ravishankar <ravishankar.srivatsa@xxxxxxxxx>
---
* changes in v10:
- In getsockopt, prepare data in advance and call copy_to_user
istead of calling put_user on each field of struct bt_codec
include/net/bluetooth/bluetooth.h | 20 +++++++
include/net/bluetooth/hci.h | 6 ++
include/net/bluetooth/hci_core.h | 3 +
net/bluetooth/sco.c | 95 +++++++++++++++++++++++++++++++
4 files changed, 124 insertions(+)
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 9125effbf448..1840756958ce 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -153,6 +153,26 @@ struct bt_voice {
#define BT_SCM_PKT_STATUS 0x03
+#define BT_CODEC 19
+
+struct bt_codec_caps {
+ __u8 len;
+ __u8 data[];
+} __packed;
+
+struct bt_codec {
+ __u8 id;
+ __le16 cid;
+ __le16 vid;
+ __u8 data_path;
+ __u8 num_caps;
+} __packed;
+
+struct bt_codecs {
+ __u8 num_codecs;
+ struct bt_codec codecs[];
+} __packed;
+
__printf(1, 2)
void bt_info(const char *fmt, ...);
__printf(1, 2)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index b4e35cf5f4b1..5e4306a46324 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -2621,6 +2621,12 @@ static inline struct hci_sco_hdr *hci_sco_hdr(const struct sk_buff *skb)
#define hci_iso_data_len(h) ((h) & 0x3fff)
#define hci_iso_data_flags(h) ((h) >> 14)
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+/* codec transport types */
+#define TRANSPORT_ACL 0x00
+#define TRANSPORT_SCO_ESCO 0x01
+#endif
+
/* le24 support */
static inline void hci_cpu_to_le24(__u32 val, __u8 dst[3])
{
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 7b8d603358b9..00c97e2ce1fd 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -621,6 +621,9 @@ struct hci_dev {
int (*set_bdaddr)(struct hci_dev *hdev, const bdaddr_t *bdaddr);
void (*cmd_timeout)(struct hci_dev *hdev);
bool (*prevent_wake)(struct hci_dev *hdev);
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ int (*get_data_path_id)(struct hci_dev *hdev, __u8 *data_path);
+#endif
};
#define HCI_PHY_HANDLE(handle) (handle & 0xff)
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index d9a4e88dacbb..ddf9b6bd9ca3 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -948,6 +948,14 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
struct bt_voice voice;
u32 phys;
int pkt_status;
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ int buf_len;
+ struct codec_list *c;
+ u8 num_codecs, i, __user *ptr;
+ struct hci_dev *hdev;
+ struct hci_codec_caps *caps;
+ struct bt_codec codec;
+#endif
BT_DBG("sk %p", sk);
@@ -1012,6 +1020,93 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
err = -EFAULT;
break;
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ case BT_CODEC:
+ num_codecs = 0;
+ buf_len = 0;
+
+ hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
+ if (!hdev) {
+ err = -EBADFD;
+ break;
+ }
+
+ if (!hdev->get_data_path_id) {
+ err = -EOPNOTSUPP;
+ break;
+ }
+
+ /* find total buffer size required to copy codec + caps */
+ hci_dev_lock(hdev);
+ list_for_each_entry(c, &hdev->local_codecs, list) {
+ if (c->transport != TRANSPORT_SCO_ESCO)
+ continue;
+ num_codecs++;
+ for (i = 0, caps = c->caps; i < c->num_caps; i++) {
+ buf_len += 1 + caps->len;
+ caps = (void *)&caps->data[caps->len];
+ }
+ buf_len += sizeof(struct bt_codec);
+ }
+ hci_dev_unlock(hdev);
+
+ buf_len += sizeof(struct bt_codecs);
+ if (buf_len > len) {
+ err = -ENOBUFS;
+ break;
+ }
+ ptr = optval;
+
+ if (put_user(num_codecs, ptr)) {
+ err = -EFAULT;
+ break;
+ }
+ ptr += sizeof(num_codecs);
+
+ /* Iterate all the codecs supported over SCO and populate
+ * codec data
+ */
+ hci_dev_lock(hdev);
+ list_for_each_entry(c, &hdev->local_codecs, list) {
+ if (c->transport != TRANSPORT_SCO_ESCO)
+ continue;
+
+ codec.id = c->id;
+ codec.cid = c->cid;
+ codec.vid = c->vid;
+ err = hdev->get_data_path_id(hdev, &codec.data_path);
+ if (err < 0)
+ break;
+ codec.num_caps = c->num_caps;
+ if (copy_to_user(ptr, &codec, sizeof(codec))) {
+ err = -EFAULT;
+ break;
+ }
+ ptr += sizeof(codec);
+
+ /* find codec capabilities data length */
+ len = 0;
+ for (i = 0, caps = c->caps; i < c->num_caps; i++) {
+ len += 1 + caps->len;
+ caps = (void *)&caps->data[caps->len];
+ }
+
+ /* copy codec capabilities data */
+ if (len && copy_to_user(ptr, c->caps, len)) {
+ err = -EFAULT;
+ break;
+ }
+ ptr += len;
+ }
+
+ if (!err && put_user(buf_len, optlen))
+ err = -EFAULT;
+
+ hci_dev_unlock(hdev);
+
+ break;
+#endif
+
default:
err = -ENOPROTOOPT;
break;
--
2.17.1
