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Subject: Re: [PATCH v3 1/2] Bluetooth: btusb: Indicate Microsoft vendor
 extension for Intel 9460/9560 and 9160/9260
From:   Marcel Holtmann <marcel@holtmann.org>
In-Reply-To: <20200326005931.v3.1.I0e975833a6789e8acc74be7756cd54afde6ba98c@changeid>
Date:   Thu, 26 Mar 2020 10:01:56 +0100
Cc:     Bluetooth Kernel Mailing List <linux-bluetooth@vger.kernel.org>,
        Alain Michaud <alainm@chromium.org>,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>, netdev@vger.kernel.org
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Message-Id: <ADF19483-721C-4263-8CA8-CF4587E79BA4@holtmann.org>
References: <20200326075938.65053-1-mcchou@chromium.org>
 <20200326005931.v3.1.I0e975833a6789e8acc74be7756cd54afde6ba98c@changeid>
To:     Miao-chen Chou <mcchou@chromium.org>
Sender: linux-kernel-owner@vger.kernel.org
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Hi Miao-chen,

> This adds a bit mask of driver_info for Microsoft vendor extension and
> indicates the support for Intel 9460/9560 and 9160/9260. See
> https://docs.microsoft.com/en-us/windows-hardware/drivers/bluetooth/
> microsoft-defined-bluetooth-hci-commands-and-events for more information
> about the extension. This was verified with Intel ThunderPeak BT controller
> where msft_vnd_ext_opcode is 0xFC1E.
> 
> Signed-off-by: Miao-chen Chou <mcchou@chromium.org>
> ---
> 
> Changes in v3:
> - Create net/bluetooth/msft.c with struct msft_vnd_ext defined internally
> and change the hdev->msft_ext field to void*.
> - Define and expose msft_vnd_ext_set_opcode() for btusb use.
> - Init hdev->msft_ext in hci_alloc_dev() and deinit it in hci_free_dev().

so I spent some cycles on thinking about on how we can have this nice and cleanly without putting too much into the core stack or hci_dev. I took your patches and converted them a little bit into how I would do it. Please have a look.

Regards

Marcel