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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2020 Google Corporation
- */
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/hci_core.h>
- #include "msft.h"
- #define MSFT_OP_READ_SUPPORTED_FEATURES 0x00
- struct msft_cp_read_supported_features {
- __u8 sub_opcode;
- } __packed;
- struct msft_rp_read_supported_features {
- __u8 status;
- __u8 sub_opcode;
- __le64 features;
- __u8 evt_prefix_len;
- __u8 evt_prefix[];
- } __packed;
- struct msft_data {
- __u64 features;
- __u8 evt_prefix_len;
- __u8 *evt_prefix;
- };
- static bool read_supported_features(struct hci_dev *hdev,
- struct msft_data *msft)
- {
- struct msft_cp_read_supported_features cp;
- struct msft_rp_read_supported_features *rp;
- struct sk_buff *skb;
- cp.sub_opcode = MSFT_OP_READ_SUPPORTED_FEATURES;
- skb = __hci_cmd_sync(hdev, hdev->msft_opcode, sizeof(cp), &cp,
- HCI_CMD_TIMEOUT);
- if (IS_ERR(skb)) {
- bt_dev_err(hdev, "Failed to read MSFT supported features (%ld)",
- PTR_ERR(skb));
- return false;
- }
- if (skb->len < sizeof(*rp)) {
- bt_dev_err(hdev, "MSFT supported features length mismatch");
- goto failed;
- }
- rp = (struct msft_rp_read_supported_features *)skb->data;
- if (rp->sub_opcode != MSFT_OP_READ_SUPPORTED_FEATURES)
- goto failed;
- if (rp->evt_prefix_len > 0) {
- msft->evt_prefix = kmemdup(rp->evt_prefix, rp->evt_prefix_len,
- GFP_KERNEL);
- if (!msft->evt_prefix)
- goto failed;
- }
- msft->evt_prefix_len = rp->evt_prefix_len;
- msft->features = __le64_to_cpu(rp->features);
- kfree_skb(skb);
- return true;
- failed:
- kfree_skb(skb);
- return false;
- }
- void msft_do_open(struct hci_dev *hdev)
- {
- struct msft_data *msft;
- if (hdev->msft_opcode == HCI_OP_NOP)
- return;
- bt_dev_dbg(hdev, "Initialize MSFT extension");
- msft = kzalloc(sizeof(*msft), GFP_KERNEL);
- if (!msft)
- return;
- if (!read_supported_features(hdev, msft)) {
- kfree(msft);
- return;
- }
- hdev->msft_data = msft;
- }
- void msft_do_close(struct hci_dev *hdev)
- {
- struct msft_data *msft = hdev->msft_data;
- if (!msft)
- return;
- bt_dev_dbg(hdev, "Cleanup of MSFT extension");
- hdev->msft_data = NULL;
- kfree(msft->evt_prefix);
- kfree(msft);
- }
- void msft_vendor_evt(struct hci_dev *hdev, struct sk_buff *skb)
- {
- struct msft_data *msft = hdev->msft_data;
- u8 event;
- if (!msft)
- return;
- /* When the extension has defined an event prefix, check that it
- * matches, and otherwise just return.
- */
- if (msft->evt_prefix_len > 0) {
- if (skb->len < msft->evt_prefix_len)
- return;
- if (memcmp(skb->data, msft->evt_prefix, msft->evt_prefix_len))
- return;
- skb_pull(skb, msft->evt_prefix_len);
- }
- /* Every event starts at least with an event code and the rest of
- * the data is variable and depends on the event code.
- */
- if (skb->len < 1)
- return;
- event = *skb->data;
- skb_pull(skb, 1);
- bt_dev_dbg(hdev, "MSFT vendor event %u", event);
- }
- __u64 msft_get_features(struct hci_dev *hdev)
- {
- struct msft_data *msft = hdev->msft_data;
- return msft ? msft->features : 0;
- }
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