Commit 14b49b9a authored by Marcel Holtmann's avatar Marcel Holtmann Committed by Johan Hedberg
Browse files

Bluetooth: Add management command for setting LE scan parameters 



The scan interval and window parameters are used for LE passive
background scanning and connection establishment. This allows
userspace to change the values.

These two values should be kept in sync with whatever is used for
the scan parameters service on remote devices. And it puts the
controlling daemon (for example bluetoothd) in charge of setting
the values.

Main use case would be to switch between two sets of values. One
for foreground applications and one for background applications.

At this moment, the values are only used for manual connection
establishment, but soon that should be extended to background
scanning and automatic connection establishment.

Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
parent bef64738

include/net/bluetooth/mgmt.h

+7 −0
Original line number Diff line number Diff line
@@ -362,6 +362,13 @@ struct mgmt_cp_set_static_address { 
} __packed;

#define MGMT_SET_STATIC_ADDRESS_SIZE	6



#define MGMT_OP_SET_SCAN_PARAMS		0x002C

struct mgmt_cp_set_scan_params {

	__le16	interval;

	__le16	window;

} __packed;

#define MGMT_SET_SCAN_PARAMS_SIZE	4



#define MGMT_EV_CMD_COMPLETE		0x0001

struct mgmt_ev_cmd_complete {

	__le16	opcode;

net/bluetooth/mgmt.c

+38 −0
Original line number Diff line number Diff line
@@ -3374,6 +3374,43 @@ static int set_static_address(struct sock *sk, struct hci_dev *hdev, 
	return err;

}



static int set_scan_params(struct sock *sk, struct hci_dev *hdev,

			   void *data, u16 len)

{

	struct mgmt_cp_set_scan_params *cp = data;

	__u16 interval, window;

	int err;



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



	if (!lmp_le_capable(hdev))

		return cmd_status(sk, hdev->id, MGMT_OP_SET_SCAN_PARAMS,

				  MGMT_STATUS_NOT_SUPPORTED);



	interval = __le16_to_cpu(cp->interval);



	if (interval < 0x0004 || interval > 0x4000)

		return cmd_status(sk, hdev->id, MGMT_OP_SET_SCAN_PARAMS,

				  MGMT_STATUS_INVALID_PARAMS);



	window = __le16_to_cpu(cp->window);



	if (window < 0x0004 || window > 0x4000)

		return cmd_status(sk, hdev->id, MGMT_OP_SET_SCAN_PARAMS,

				  MGMT_STATUS_INVALID_PARAMS);



	hci_dev_lock(hdev);



	hdev->le_scan_interval = interval;

	hdev->le_scan_window = window;



	err = cmd_complete(sk, hdev->id, MGMT_OP_SET_SCAN_PARAMS, 0, NULL, 0);



	hci_dev_unlock(hdev);



	return err;

}



static void fast_connectable_complete(struct hci_dev *hdev, u8 status)

{

	struct pending_cmd *cmd;
@@ -3710,6 +3747,7 @@ static const struct mgmt_handler { 
	{ set_advertising,        false, MGMT_SETTING_SIZE },

	{ set_bredr,              false, MGMT_SETTING_SIZE },

	{ set_static_address,     false, MGMT_SET_STATIC_ADDRESS_SIZE },

	{ set_scan_params,        false, MGMT_SET_SCAN_PARAMS_SIZE },

};

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