Hi Marcel,
On Fri, Feb 3, 2012 at 2:39 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
> Hi Andre,
>
>> 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@xxxxxxxxxxxxx>
>> ---
>> include/net/bluetooth/hci_core.h | 8 ++++
>> net/bluetooth/hci_core.c | 79 ++++++++++++++++++++++++++++++++++++++
>> net/bluetooth/hci_event.c | 13 +++++-
>> 3 files changed, 97 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
>> index eab98d3..47111df 100644
>> --- a/include/net/bluetooth/hci_core.h
>> +++ b/include/net/bluetooth/hci_core.h
>> @@ -126,6 +126,12 @@ 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;
>> @@ -263,6 +269,8 @@ 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);
>> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
>> index 35843f1..2f5d1ae 100644
>> --- a/net/bluetooth/hci_core.c
>> +++ b/net/bluetooth/hci_core.c
>> @@ -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);
>> @@ -1573,6 +1575,81 @@ 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) ¶m,
>> + timeo);
>> + if (err < 0)
>> + goto failed;
>> +
>> + err = __hci_request(hdev, le_scan_enable_req, 0, timeo);
>> + if (err < 0)
>> + goto failed;
>> +
>> + hci_req_unlock(hdev);
>
> in this specific case, it might be better to do it like this:
>
> hci_req_lock();
>
> err = __hci_request(hdev, ...)
> if (!err)
> err = __hci_request(hdev, ...)
>
> hci_req_unlock()
>
> if (err < 0)
> return err;
Ok, I'm gonna change this and send a new version of this series.
>> +
>> + schedule_delayed_work(&hdev->le_scan_disable,
>> + msecs_to_jiffies(timeout));
>> +
>> + return 0;
>> +
>> +failed:
>> + hci_req_unlock(hdev);
>> + return err;
>> +}
>> +
>> +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)
>> {
>> @@ -1658,6 +1735,8 @@ 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 |
>> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
>> index dd8056c..0bcfeca 100644
>> --- a/net/bluetooth/hci_event.c
>> +++ b/net/bluetooth/hci_event.c
>> @@ -1030,6 +1030,8 @@ 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,
>> @@ -1040,15 +1042,17 @@ 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);
>> @@ -1060,6 +1064,9 @@ 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);
>
> Long term we can not spread hci_req_complete around. We need a more
> general solution. Please start working on that one and send a proposal.
Sure, I talked with Claudio and as soon as we finish pushing discovery
patches upstream I can work on a general solution for that.
BR,
Andre
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