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Date: Tue, 2 Nov 2021 15:19:28 +0800
From: Joseph Hwang <josephsih@...omium.org>
To: linux-bluetooth@...r.kernel.org, marcel@...tmann.org,
luiz.dentz@...il.com, pali@...nel.org
Cc: chromeos-bluetooth-upstreaming@...omium.org, josephsih@...gle.com,
Joseph Hwang <josephsih@...omium.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Johan Hedberg <johan.hedberg@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v7 1/2] Bluetooth: Add struct of reading AOSP vendor capabilities
This patch adds the struct of reading AOSP vendor capabilities.
New capabilities are added incrementally. Note that the
version_supported octets will be used to determine whether a
capability has been defined for the version.
Signed-off-by: Joseph Hwang <josephsih@...omium.org>
---
Changes in v7:
- Use the full struct aosp_rp_le_get_vendor_capa. If the
version_supported is >= 98, check bluetooth_quality_report_support.
- Use __le16 and __le32.
- Use proper bt_dev_err and bt_dev_warn per review comments.
- Skip unnecessary bt_dev_dbg.
- Remove unnecessary rp->status check.
- Skip unnecessary check about version_supported on versions that we
do not care about. For now, we only care about quality report support.
- Add the define for the length of the struct.
- Mediatek will submit a separate patch to enable aosp.
Changes in v6:
- Add historical versions of struct aosp_rp_le_get_vendor_capabilities.
- Perform the basic check about the struct length.
- Through the version, bluetooth_quality_report_support can be checked.
Changes in v5:
- This is a new patch.
- Add struct aosp_rp_le_get_vendor_capabilities so that next patch
can determine whether a particular capability is supported or not.
include/net/bluetooth/hci_core.h | 1 +
net/bluetooth/aosp.c | 83 +++++++++++++++++++++++++++++++-
2 files changed, 83 insertions(+), 1 deletion(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 53a8c7d3a4bf..b5f061882c10 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -603,6 +603,7 @@ struct hci_dev {
#if IS_ENABLED(CONFIG_BT_AOSPEXT)
bool aosp_capable;
+ bool aosp_quality_report;
#endif
int (*open)(struct hci_dev *hdev);
diff --git a/net/bluetooth/aosp.c b/net/bluetooth/aosp.c
index a1b7762335a5..0d4f1702ce35 100644
--- a/net/bluetooth/aosp.c
+++ b/net/bluetooth/aosp.c
@@ -8,9 +8,43 @@
#include "aosp.h"
+/* Command complete parameters of LE_Get_Vendor_Capabilities_Command
+ * The parameters grow over time. The base version that declares the
+ * version_supported field is v0.95. Refer to
+ * https://cs.android.com/android/platform/superproject/+/master:system/
+ * bt/gd/hci/controller.cc;l=452?q=le_get_vendor_capabilities_handler
+ */
+struct aosp_rp_le_get_vendor_capa {
+ /* v0.95: 15 octets */
+ __u8 status;
+ __u8 max_advt_instances;
+ __u8 offloaded_resolution_of_private_address;
+ __le16 total_scan_results_storage;
+ __u8 max_irk_list_sz;
+ __u8 filtering_support;
+ __u8 max_filter;
+ __u8 activity_energy_info_support;
+ __le16 version_supported;
+ __le16 total_num_of_advt_tracked;
+ __u8 extended_scan_support;
+ __u8 debug_logging_supported;
+ /* v0.96: 16 octets */
+ __u8 le_address_generation_offloading_support;
+ /* v0.98: 21 octets */
+ __le32 a2dp_source_offload_capability_mask;
+ __u8 bluetooth_quality_report_support;
+ /* v1.00: 25 octets */
+ __le32 dynamic_audio_buffer_support;
+} __packed;
+
+#define VENDOR_CAPA_BASE_SIZE 15
+#define VENDOR_CAPA_0_98_SIZE 21
+
void aosp_do_open(struct hci_dev *hdev)
{
struct sk_buff *skb;
+ struct aosp_rp_le_get_vendor_capa *rp;
+ u16 version_supported;
if (!hdev->aosp_capable)
return;
@@ -20,9 +54,56 @@ void aosp_do_open(struct hci_dev *hdev)
/* LE Get Vendor Capabilities Command */
skb = __hci_cmd_sync(hdev, hci_opcode_pack(0x3f, 0x153), 0, NULL,
HCI_CMD_TIMEOUT);
- if (IS_ERR(skb))
+ if (IS_ERR(skb)) {
+ bt_dev_err(hdev, "AOSP get vendor capabilities (%ld)",
+ PTR_ERR(skb));
return;
+ }
+
+ /* A basic length check */
+ if (skb->len < VENDOR_CAPA_BASE_SIZE)
+ goto length_error;
+
+ rp = (struct aosp_rp_le_get_vendor_capa *)skb->data;
+
+ version_supported = le16_to_cpu(rp->version_supported);
+ /* AOSP displays the verion number like v0.98, v1.00, etc. */
+ bt_dev_info(hdev, "AOSP version v%u.%02u",
+ version_supported >> 8, version_supported & 0xff);
+
+ /* Do not support very old versions. */
+ if (version_supported < 95) {
+ bt_dev_warn(hdev, "AOSP capabilities version %u too old",
+ version_supported);
+ goto done;
+ }
+
+ if (version_supported >= 95 && version_supported < 98) {
+ bt_dev_warn(hdev, "AOSP quality report is not supported");
+ goto done;
+ }
+
+ if (version_supported >= 98) {
+ if (skb->len < VENDOR_CAPA_0_98_SIZE)
+ goto length_error;
+
+ /* The bluetooth_quality_report_support is defined at version
+ * v0.98. Refer to
+ * https://cs.android.com/android/platform/superproject/+/
+ * master:system/bt/gd/hci/controller.cc;l=477
+ */
+ if (rp->bluetooth_quality_report_support) {
+ hdev->aosp_quality_report = true;
+ bt_dev_info(hdev, "AOSP quality report is supported");
+ }
+ }
+
+ goto done;
+
+length_error:
+ bt_dev_err(hdev, "AOSP capabilities length %d too short", skb->len);
+done:
kfree_skb(skb);
}
--
2.33.1.1089.g2158813163f-goog
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