Move reading of supported local codecs into a separate init function,
query codecs capabilities and cache the data
Signed-off-by: Kiran K <kiran.k@xxxxxxxxx>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
Signed-off-by: Srivatsa Ravishankar <ravishankar.srivatsa@xxxxxxxxx>
---
* changes in v10:
- define Kconfig to control offload feature at build time
- fix review comments
* changes in v9:
- use shortname vnd instead of ven
* changes in v8:
- add comments
- split __u8 codec_id[5] into {__u8 id; __le16 cid, vid }
- address review comment related codec caps structure
* changes in v7:
- keep codec enumeration call in hci_init instead of having a separate
function
- Remove unused bitmasks defined for LE transports
* changes in v6:
- fix compiler warning reported for ARCH=arc
* changes in v5:
- fix review comments
- move code used to read standard/vendor codecs caps into single function
* changes in v4:
- convert reading of codecs and codecs caps calls from async to sync
* changes in v3
move codec enumeration into a new init function
* changes in v2
add skb length check before accessing data
include/net/bluetooth/hci.h | 41 ++++++
include/net/bluetooth/hci_core.h | 23 ++++
net/bluetooth/Kconfig | 11 ++
net/bluetooth/hci_core.c | 207 ++++++++++++++++++++++++++++++-
4 files changed, 278 insertions(+), 4 deletions(-)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index b80415011dcd..f76849c8eafd 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -1307,6 +1307,28 @@ struct hci_rp_read_data_block_size {
} __packed;
#define HCI_OP_READ_LOCAL_CODECS 0x100b
+struct hci_std_codecs {
+ __u8 num;
+ __u8 codec[];
+} __packed;
+
+struct hci_vnd_codec {
+ /* company id */
+ __le16 cid;
+ /* vendor codec id */
+ __le16 vid;
+} __packed;
+
+struct hci_vnd_codecs {
+ __u8 num;
+ struct hci_vnd_codec codec[];
+} __packed;
+
+struct hci_rp_read_local_supported_codecs {
+ __u8 status;
+ struct hci_std_codecs std_codecs;
+ struct hci_vnd_codecs vnd_codecs;
+} __packed;
#define HCI_OP_READ_LOCAL_PAIRING_OPTS 0x100c
struct hci_rp_read_local_pairing_opts {
@@ -1315,6 +1337,25 @@ struct hci_rp_read_local_pairing_opts {
__u8 max_key_size;
} __packed;
+#define HCI_OP_READ_LOCAL_CODEC_CAPS 0x100e
+struct hci_op_read_local_codec_caps {
+ __u8 id;
+ __le16 cid;
+ __le16 vid;
+ __u8 transport;
+ __u8 direction;
+} __packed;
+
+struct hci_codec_caps {
+ __u8 len;
+ __u8 data[];
+} __packed;
+
+struct hci_rp_read_local_codec_caps {
+ __u8 status;
+ __u8 num_caps;
+} __packed;
+
#define HCI_OP_READ_PAGE_SCAN_ACTIVITY 0x0c1b
struct hci_rp_read_page_scan_activity {
__u8 status;
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index a53e94459ecd..7b8d603358b9 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -131,6 +131,19 @@ struct bdaddr_list {
u8 bdaddr_type;
};
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+struct codec_list {
+ struct list_head list;
+ u8 id;
+ __le16 cid;
+ __le16 vid;
+ u8 transport;
+ u8 num_caps;
+ u32 len;
+ struct hci_codec_caps caps[];
+};
+#endif
+
struct bdaddr_list_with_irk {
struct list_head list;
bdaddr_t bdaddr;
@@ -535,6 +548,9 @@ struct hci_dev {
struct list_head pend_le_conns;
struct list_head pend_le_reports;
struct list_head blocked_keys;
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ struct list_head local_codecs;
+#endif
struct hci_dev_stats stat;
@@ -1849,4 +1865,11 @@ void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr,
#define SCO_AIRMODE_CVSD 0x0000
#define SCO_AIRMODE_TRANSP 0x0003
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+#define LOCAL_CODEC_ACL_MASK BIT(0)
+#define LOCAL_CODEC_SCO_MASK BIT(1)
+
+#define TRANSPORT_TYPE_MAX 0x04
+#endif
+
#endif /* __HCI_CORE_H */
diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig
index e0ab4cd7afc3..1069623f36c4 100644
--- a/net/bluetooth/Kconfig
+++ b/net/bluetooth/Kconfig
@@ -92,6 +92,17 @@ config BT_LEDS
This option selects a few LED triggers for different
Bluetooth events.
+config BT_OFFLOAD_CODECS
+ bool "Enable offload codecs"
+ depends on BT && BT_BREDR
+ default n
+ help
+ This option enables offload codecs if controller supports.
+ When this option is enabled, user space audio modules can
+ query offload codecs and can set the codec to be used for
+ specific use case.
+
+
config BT_MSFTEXT
bool "Enable Microsoft extensions"
depends on BT
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2560ed2f144d..2657d84e8240 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -838,10 +838,6 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt)
if (hdev->commands[22] & 0x04)
hci_set_event_mask_page_2(req);
- /* Read local codec list if the HCI command is supported */
- if (hdev->commands[29] & 0x20)
- hci_req_add(req, HCI_OP_READ_LOCAL_CODECS, 0, NULL);
-
/* Read local pairing options if the HCI command is supported */
if (hdev->commands[41] & 0x08)
hci_req_add(req, HCI_OP_READ_LOCAL_PAIRING_OPTS, 0, NULL);
@@ -907,6 +903,197 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt)
return 0;
}
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+static int hci_codec_list_add(struct list_head *list,
+ struct hci_op_read_local_codec_caps *sent,
+ struct hci_rp_read_local_codec_caps *rp,
+ void *caps,
+ __u32 len)
+{
+ struct codec_list *entry;
+
+ entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ entry->id = sent->id;
+ if (sent->id == 0xFF) {
+ entry->cid = __le16_to_cpu(sent->cid);
+ entry->vid = __le16_to_cpu(sent->vid);
+ }
+ entry->transport = sent->transport;
+ entry->len = len;
+ entry->num_caps = rp->num_caps;
+ if (rp->num_caps)
+ memcpy(entry->caps, caps, len);
+ list_add(&entry->list, list);
+
+ return 0;
+}
+
+static void hci_codec_list_clear(struct list_head *codec_list)
+{
+ struct codec_list *c, *n;
+
+ list_for_each_entry_safe(c, n, codec_list, list) {
+ list_del(&c->list);
+ kfree(c);
+ }
+}
+
+static void hci_read_codec_capabilities(struct hci_dev *hdev, void *codec_id,
+ __u8 transport, bool is_vnd_codec)
+{
+ struct hci_op_read_local_codec_caps cmd;
+ __u8 i;
+
+ memset(&cmd, 0, sizeof(cmd));
+
+ if (is_vnd_codec) {
+ struct hci_vnd_codec *vnd_codec;
+
+ vnd_codec = codec_id;
+ cmd.id = 0xFF;
+ cmd.cid = vnd_codec->cid;
+ cmd.vid = vnd_codec->vid;
+ } else {
+ cmd.id = *(__u8 *)codec_id;
+ }
+
+ cmd.direction = 0x00;
+
+ for (i = 0; i < TRANSPORT_TYPE_MAX; i++) {
+ if (transport & BIT(i)) {
+ struct hci_rp_read_local_codec_caps *rp;
+ struct hci_codec_caps *caps;
+ struct sk_buff *skb;
+ __u8 j;
+ __u32 len;
+
+ cmd.transport = i;
+ skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS,
+ sizeof(cmd), &cmd,
+ HCI_CMD_TIMEOUT);
+ if (IS_ERR(skb)) {
+ bt_dev_err(hdev, "Failed to read codec capabilities (%ld)",
+ PTR_ERR(skb));
+ continue;
+ }
+
+ if (skb->len < sizeof(*rp))
+ goto error;
+
+ rp = (void *)skb->data;
+
+ if (rp->status)
+ goto error;
+
+ if (!rp->num_caps) {
+ len = 0;
+ /* this codec doesn't have capabilities */
+ goto skip_caps_parse;
+ }
+
+ skb_pull(skb, sizeof(*rp));
+
+ for (j = 0, len = 0; j < rp->num_caps; j++) {
+ caps = (void *)skb->data;
+ if (skb->len < sizeof(*caps))
+ goto error;
+ if (skb->len < caps->len)
+ goto error;
+ len += sizeof(caps->len) + caps->len;
+ skb_pull(skb, sizeof(caps->len) + caps->len);
+ }
+
+skip_caps_parse:
+ hci_dev_lock(hdev);
+ hci_codec_list_add(&hdev->local_codecs, &cmd, rp,
+ (__u8 *)rp + sizeof(*rp), len);
+ hci_dev_unlock(hdev);
+error:
+ kfree_skb(skb);
+ }
+ }
+}
+
+static void hci_codec_list_parse(struct hci_dev *hdev, __u8 num_codecs,
+ void *codec_list, bool is_vnd_codec)
+{
+ __u8 i;
+
+ for (i = 0; i < num_codecs; i++) {
+ if (!is_vnd_codec) {
+ struct hci_std_codecs *codecs = codec_list;
+
+ hci_read_codec_capabilities(hdev, &codecs->codec[i],
+ LOCAL_CODEC_ACL_MASK,
+ is_vnd_codec);
+ } else {
+ struct hci_vnd_codecs *codecs = codec_list;
+
+ hci_read_codec_capabilities(hdev, &codecs->codec[i],
+ LOCAL_CODEC_ACL_MASK,
+ is_vnd_codec);
+ }
+ }
+}
+
+static void hci_read_supported_codecs(struct hci_dev *hdev)
+{
+ struct sk_buff *skb;
+ struct hci_rp_read_local_supported_codecs *rp;
+ struct hci_std_codecs *std_codecs;
+ struct hci_vnd_codecs *vnd_codecs;
+
+ skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS, 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;
+
+ /* validate codecs length before accessing */
+ if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
+ + sizeof(std_codecs->num))
+ goto error;
+
+ /* enumerate codec capabilities of standard codecs */
+ hci_codec_list_parse(hdev, std_codecs->num, std_codecs, false);
+
+ skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
+ + sizeof(std_codecs->num));
+
+ vnd_codecs = (void *)skb->data;
+
+ /* validate vendor codecs length before accessing */
+ if (skb->len <
+ flex_array_size(vnd_codecs, codec, vnd_codecs->num)
+ + sizeof(vnd_codecs->num))
+ goto error;
+
+ /* enumerate vendor codec capabilities */
+ hci_codec_list_parse(hdev, vnd_codecs->num, vnd_codecs, true);
+
+error:
+ kfree_skb(skb);
+}
+#endif
+
static int __hci_init(struct hci_dev *hdev)
{
int err;
@@ -937,6 +1124,12 @@ static int __hci_init(struct hci_dev *hdev)
if (err < 0)
return err;
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ /* Read local codec list if the HCI command is supported */
+ if (hdev->commands[29] & 0x20)
+ hci_read_supported_codecs(hdev);
+#endif
+
/* This function is only called when the controller is actually in
* configured state. When the controller is marked as unconfigured,
* this initialization procedure is not run.
@@ -1841,6 +2034,9 @@ int hci_dev_do_close(struct hci_dev *hdev)
memset(hdev->eir, 0, sizeof(hdev->eir));
memset(hdev->dev_class, 0, sizeof(hdev->dev_class));
bacpy(&hdev->random_addr, BDADDR_ANY);
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ hci_codec_list_clear(&hdev->local_codecs);
+#endif
hci_req_sync_unlock(hdev);
@@ -3843,6 +4039,9 @@ struct hci_dev *hci_alloc_dev(void)
INIT_LIST_HEAD(&hdev->adv_instances);
INIT_LIST_HEAD(&hdev->blocked_keys);
+#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS)
+ INIT_LIST_HEAD(&hdev->local_codecs);
+#endif
INIT_WORK(&hdev->rx_work, hci_rx_work);
INIT_WORK(&hdev->cmd_work, hci_cmd_work);
INIT_WORK(&hdev->tx_work, hci_tx_work);
--
2.17.1
