142 lines
2.8 KiB
C
142 lines
2.8 KiB
C
|
// 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[0];
|
||
|
|
} __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);
|
||
|
|
}
|