linux-kernel - Re: [PATCH 2/2] Bluetooth: btqcomsmd: BD address setup

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Date:   Fri, 1 Sep 2017 22:47:23 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     "Gustavo F. Padovan" <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        Loic Poulain <loic.poulain@...aro.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 2/2] Bluetooth: btqcomsmd: BD address setup

Hi Bjorn,

> Bluetooth BD address can be retrieved in the same way as
> for wcnss-wlan MAC address. This patch mainly stores the
> local-mac-address property and sets the BD address during
> hci device setup.
> 
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> drivers/bluetooth/btqcomsmd.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c
> index d00c4fdae924..443bb2099329 100644
> --- a/drivers/bluetooth/btqcomsmd.c
> +++ b/drivers/bluetooth/btqcomsmd.c
> @@ -26,6 +26,7 @@
> struct btqcomsmd {
> 	struct hci_dev *hdev;
> 
> +	const bdaddr_t *addr;
> 	struct rpmsg_endpoint *acl_channel;
> 	struct rpmsg_endpoint *cmd_channel;
> };
> @@ -100,6 +101,27 @@ static int btqcomsmd_close(struct hci_dev *hdev)
> 	return 0;
> }
> 
> +static int btqcomsmd_setup(struct hci_dev *hdev)
> +{
> +	struct btqcomsmd *btq = hci_get_drvdata(hdev);
> +	struct sk_buff *skb;
> +
> +	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
> +	if (IS_ERR(skb))
> +		return PTR_ERR(skb);
> +	kfree_skb(skb);
> +
> +	if (btq->addr) {
> +		bdaddr_t bdaddr;
> +
> +		/* btq->addr stored with most significant byte first */
> +		baswap(&bdaddr, btq->addr);
> +		return qca_set_bdaddr_rome(hdev, &bdaddr);
> +	}
> +
> +	return 0;
> +}
> +
> static int btqcomsmd_probe(struct platform_device *pdev)
> {
> 	struct btqcomsmd *btq;
> @@ -123,6 +145,11 @@ static int btqcomsmd_probe(struct platform_device *pdev)
> 	if (IS_ERR(btq->cmd_channel))
> 		return PTR_ERR(btq->cmd_channel);
> 
> +	btq->addr = of_get_property(pdev->dev.of_node, "local-mac-address",
> +				    &ret);
> +	if (ret != sizeof(bdaddr_t))
> +		btq->addr = NULL;
> +
> 	hdev = hci_alloc_dev();
> 	if (!hdev)
> 		return -ENOMEM;
> @@ -135,6 +162,7 @@ static int btqcomsmd_probe(struct platform_device *pdev)
> 	hdev->open = btqcomsmd_open;
> 	hdev->close = btqcomsmd_close;
> 	hdev->send = btqcomsmd_send;
> +	hdev->setup = btqcomsmd_setup;
> 	hdev->set_bdaddr = qca_set_bdaddr_rome;

I do not like this patch. Why not just set HCI_QUIRK_INVALID_BDADDR and let a userspace tool deal with reading the BD_ADDR from some storage.

Frankly I do not get this WiFI MAC address or BD_ADDR stored in DT. I assumed the DT is suppose to describe hardware and not some value that is normally retrieved for OTP or alike.

Regards

Marcel