Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 45bb4bf0 authored by Marcel Holtmann's avatar Marcel Holtmann Committed by David S. Miller
Browse files

[Bluetooth]: Workaround for inquiry results with RSSI and page scan mode 



This patch implements a workaround for buggy Bluetooth 1.2 devices from
Silicon Wave. Their inquiry results with RSSI contain the page scan mode
field. This field was removed in the final Bluetooth 1.2 specification.

Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4aa769b9

include/net/bluetooth/hci.h

+9 −0
Original line number Diff line number Diff line
@@ -453,6 +453,15 @@ struct inquiry_info_with_rssi { 
	__u16    clock_offset;

	__s8     rssi;

} __attribute__ ((packed));

struct inquiry_info_with_rssi_and_pscan_mode {

	bdaddr_t bdaddr;

	__u8     pscan_rep_mode;

	__u8     pscan_period_mode;

	__u8     pscan_mode;

	__u8     dev_class[3];

	__u16    clock_offset;

	__s8     rssi;

} __attribute__ ((packed));



#define HCI_EV_CONN_COMPLETE 	0x03

struct hci_ev_conn_complete {

net/bluetooth/hci_event.c

+42 −13
Original line number Diff line number Diff line
@@ -484,14 +484,18 @@ static inline void hci_inquiry_complete_evt(struct hci_dev *hdev, struct sk_buff 
/* Inquiry Result */

static inline void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb)

{

	struct inquiry_data data;

	struct inquiry_info *info = (struct inquiry_info *) (skb->data + 1);

	int num_rsp = *((__u8 *) skb->data);



	BT_DBG("%s num_rsp %d", hdev->name, num_rsp);



	if (!num_rsp)

		return;



	hci_dev_lock(hdev);



	for (; num_rsp; num_rsp--) {

		struct inquiry_data data;

		bacpy(&data.bdaddr, &info->bdaddr);

		data.pscan_rep_mode	= info->pscan_rep_mode;

		data.pscan_period_mode	= info->pscan_period_mode;
@@ -502,20 +506,43 @@ static inline void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff * 
		info++;

		hci_inquiry_cache_update(hdev, &data);

	}



	hci_dev_unlock(hdev);

}



/* Inquiry Result With RSSI */

static inline void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev, struct sk_buff *skb)

{

	struct inquiry_info_with_rssi *info = (struct inquiry_info_with_rssi *) (skb->data + 1);

	struct inquiry_data data;

	int num_rsp = *((__u8 *) skb->data);



	BT_DBG("%s num_rsp %d", hdev->name, num_rsp);



	if (!num_rsp)

		return;



	hci_dev_lock(hdev);



	if ((skb->len - 1) / num_rsp != sizeof(struct inquiry_info_with_rssi)) {

		struct inquiry_info_with_rssi_and_pscan_mode *info =

			(struct inquiry_info_with_rssi_and_pscan_mode *) (skb->data + 1);



		for (; num_rsp; num_rsp--) {

			bacpy(&data.bdaddr, &info->bdaddr);

			data.pscan_rep_mode	= info->pscan_rep_mode;

			data.pscan_period_mode	= info->pscan_period_mode;

			data.pscan_mode		= info->pscan_mode;

			memcpy(data.dev_class, info->dev_class, 3);

			data.clock_offset	= info->clock_offset;

			data.rssi		= info->rssi;

			info++;

			hci_inquiry_cache_update(hdev, &data);

		}

	} else {

		struct inquiry_info_with_rssi *info =

			(struct inquiry_info_with_rssi *) (skb->data + 1);



		for (; num_rsp; num_rsp--) {

		struct inquiry_data data;

			bacpy(&data.bdaddr, &info->bdaddr);

			data.pscan_rep_mode	= info->pscan_rep_mode;

			data.pscan_period_mode	= info->pscan_period_mode;
@@ -526,6 +553,8 @@ static inline void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev, struct 
			info++;

			hci_inquiry_cache_update(hdev, &data);

		}

	}



	hci_dev_unlock(hdev);

}