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Bluetooth: Add hci_do_le_scan()

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This patch adds to hci_core the hci_do_le_scan function which
should be used to scan LE devices.

In order to enable LE scan, hci_do_le_scan() sends commands (Set
LE Scan Parameters and Set LE Scan Enable) to the controller and
waits for its results. If commands were executed successfully a
delayed work is scheduled to disable the ongoing scanning after
some amount of time. This function blocks.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Andre Guedes 2012-02-03 17:47:59 -03:00 committed by Johan Hedberg
parent 6fbe195dc4
commit 7ba8b4be38
3 changed files with 92 additions and 3 deletions
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8
include/net/bluetooth/hci_core.h
View File

@ -122,6 +122,12 @@ struct adv_entry {
u8 bdaddr_type;
};
struct le_scan_params {
u8 type;
u16 interval;
u16 window;
};
#define NUM_REASSEMBLY 4
struct hci_dev {
struct list_head list;
@ -261,6 +267,8 @@ struct hci_dev {
unsigned long dev_flags;
struct delayed_work le_scan_disable;
int (*open)(struct hci_dev *hdev);
int (*close)(struct hci_dev *hdev);
int (*flush)(struct hci_dev *hdev);

74
net/bluetooth/hci_core.c
View File

@ -759,6 +759,8 @@ static int hci_dev_do_close(struct hci_dev *hdev)
if (test_and_clear_bit(HCI_SERVICE_CACHE, &hdev->dev_flags))
cancel_delayed_work(&hdev->service_cache);
cancel_delayed_work_sync(&hdev->le_scan_disable);
hci_dev_lock(hdev);
inquiry_cache_flush(hdev);
hci_conn_hash_flush(hdev);
@ -1596,6 +1598,76 @@ int hci_add_adv_entry(struct hci_dev *hdev,
return 0;
}
static void le_scan_param_req(struct hci_dev *hdev, unsigned long opt)
{
struct le_scan_params *param = (struct le_scan_params *) opt;
struct hci_cp_le_set_scan_param cp;
memset(&cp, 0, sizeof(cp));
cp.type = param->type;
cp.interval = cpu_to_le16(param->interval);
cp.window = cpu_to_le16(param->window);
hci_send_cmd(hdev, HCI_OP_LE_SET_SCAN_PARAM, sizeof(cp), &cp);
}
static void le_scan_enable_req(struct hci_dev *hdev, unsigned long opt)
{
struct hci_cp_le_set_scan_enable cp;
memset(&cp, 0, sizeof(cp));
cp.enable = 1;
hci_send_cmd(hdev, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
}
static int hci_do_le_scan(struct hci_dev *hdev, u8 type, u16 interval,
u16 window, int timeout)
{
long timeo = msecs_to_jiffies(3000);
struct le_scan_params param;
int err;
BT_DBG("%s", hdev->name);
if (test_bit(HCI_LE_SCAN, &hdev->dev_flags))
return -EINPROGRESS;
param.type = type;
param.interval = interval;
param.window = window;
hci_req_lock(hdev);
err = __hci_request(hdev, le_scan_param_req, (unsigned long) &param,
timeo);
if (!err)
err = __hci_request(hdev, le_scan_enable_req, 0, timeo);
hci_req_unlock(hdev);
if (err < 0)
return err;
schedule_delayed_work(&hdev->le_scan_disable,
msecs_to_jiffies(timeout));
return 0;
}
static void le_scan_disable_work(struct work_struct *work)
{
struct hci_dev *hdev = container_of(work, struct hci_dev,
le_scan_disable.work);
struct hci_cp_le_set_scan_enable cp;
BT_DBG("%s", hdev->name);
memset(&cp, 0, sizeof(cp));
hci_send_cmd(hdev, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
}
/* Register HCI device */
int hci_register_dev(struct hci_dev *hdev)
{
@ -1682,6 +1754,8 @@ int hci_register_dev(struct hci_dev *hdev)
atomic_set(&hdev->promisc, 0);
INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work);
write_unlock(&hci_dev_list_lock);
hdev->workqueue = alloc_workqueue(hdev->name, WQ_HIGHPRI | WQ_UNBOUND |

13
net/bluetooth/hci_event.c
View File

@ -1031,6 +1031,8 @@ static void hci_cc_le_set_scan_param(struct hci_dev *hdev, struct sk_buff *skb)
__u8 status = *((__u8 *) skb->data);
BT_DBG("%s status 0x%x", hdev->name, status);
hci_req_complete(hdev, HCI_OP_LE_SET_SCAN_PARAM, status);
}
static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
@ -1041,15 +1043,17 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
BT_DBG("%s status 0x%x", hdev->name, status);
if (status)
return;
cp = hci_sent_cmd_data(hdev, HCI_OP_LE_SET_SCAN_ENABLE);
if (!cp)
return;
switch (cp->enable) {
case LE_SCANNING_ENABLED:
hci_req_complete(hdev, HCI_OP_LE_SET_SCAN_ENABLE, status);
if (status)
return;
set_bit(HCI_LE_SCAN, &hdev->dev_flags);
cancel_delayed_work_sync(&hdev->adv_work);
@ -1061,6 +1065,9 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
break;
case LE_SCANNING_DISABLED:
if (status)
return;
clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
hci_dev_lock(hdev);