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SubjectRe: [PATCH 1/2] Bluetooth: Add LED triggers for HCI frames tx and rx
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Hi Guodong,

>>> Two LED triggers are defined: tx_led and rx_led. Upon frames
>>> available in HCI core layer, for tx or for rx, the combined LED
>>> can blink.
>>>
>>> Verified on HiKey, 96boards. It uses hi6220 SoC and TI WL1835 combo
>>> chip.
>>>
>>> Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
>>> ---
>>> include/net/bluetooth/hci_core.h | 1 +
>>> net/bluetooth/hci_core.c | 3 +++
>>> net/bluetooth/leds.c | 15 +++++++++++++++
>>> net/bluetooth/leds.h | 2 ++
>>> 4 files changed, 21 insertions(+)
>>>
>>> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
>>> index dc71473..37b8dd9 100644
>>> --- a/include/net/bluetooth/hci_core.h
>>> +++ b/include/net/bluetooth/hci_core.h
>>> @@ -398,6 +398,7 @@ struct hci_dev {
>>> bdaddr_t rpa;
>>>
>>> struct led_trigger *power_led;
>>> + struct led_trigger *tx_led, *rx_led;
>>>
>>> int (*open)(struct hci_dev *hdev);
>>> int (*close)(struct hci_dev *hdev);
>>> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
>>> index 45a9fc6..c6e1210 100644
>>> --- a/net/bluetooth/hci_core.c
>>> +++ b/net/bluetooth/hci_core.c
>>> @@ -3248,6 +3248,7 @@ int hci_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
>>> skb_queue_tail(&hdev->rx_q, skb);
>>> queue_work(hdev->workqueue, &hdev->rx_work);
>>>
>>> + hci_leds_blink_oneshot(hdev->rx_led);
>>> return 0;
>>> }
>>> EXPORT_SYMBOL(hci_recv_frame);
>>> @@ -3325,6 +3326,8 @@ static void hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
>>> BT_ERR("%s sending frame failed (%d)", hdev->name, err);
>>> kfree_skb(skb);
>>> }
>>> +
>>> + hci_leds_blink_oneshot(hdev->tx_led);
>>> }
>>
>> so I am not convinced that this is the right way of doing TX/RX activity leds. This would have them purely based on HCI traffic and this would include control frames.
>>
>
> Hi, Marcel
>
> + if (hci_skb_pkt_type(skb) == HCI_ACLDATA_PKT ||
> + hci_skb_pkt_type(skb) == HCI_SCODATA_PKT)
> + hci_leds_blink_oneshot(hdev->rx_led);
> +
>
> By adding pkt_type checks, we can limit LED blinks only at ACL/SCO
> DATA_PKT. Similar checks can be added for tx_led too.
>
> Does this look good to you? If you agree, I can send v2 to include this change.

we are not going to keep comparing packet types over and over again. The code is already doing that. So functions like hci_sched_acl and hci_acldata_packet are already present in the code.

>> I think that we want activity leds for actual radio activity. Meaning that when we have an active connection and ACL packets are exchanged or when we are scanning.
>>
>
> Radio is controlled in Bluetooth module side, not Host. So I'm afraid
> actual radio activity cannot be captured in its exact form in Host
> side. The purpose of this patch is not for radio, it is for
> incoming/outgoing data. For example, it can give user a blinking
> indicator on RX frames after a Bluetooth mouse is connected. Another
> example, it can blink at bluetooth streamed audio (TX).

So radio activity is caused by RX/TX meaning ACL/SCO packets for sure. There is also other radio activity caused by scanning, inquiry, create connection etc. And the question is if this should be there as well.

Regards

Marcel

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