linux-kernel - Re: [PATCH v3] HID: hid-google-stadiaff: add support for Stadia force feedback

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Message-ID: <878rbidwn5.fsf@nvidia.com>
Date:   Fri, 14 Jul 2023 14:13:34 -0700
From:   Rahul Rameshbabu <rrameshbabu@...dia.com>
To:     Fabio Baltieri <fabiobaltieri@...omium.org>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] HID: hid-google-stadiaff: add support for Stadia
 force feedback

On Sun, 09 Jul, 2023 21:44:10 +0000 Fabio Baltieri <fabiobaltieri@...omium.org> wrote:
> Add a hid-stadiaff module to support rumble based force feedback on the
> Google Stadia controller. This works using the HID output endpoint
> exposed on both the USB and BLE interface.
>
> Signed-off-by: Fabio Baltieri <fabiobaltieri@...omium.org>
> ---
> +static int stadia_probe(struct hid_device *hdev, const struct hid_device_id *id)
> +{
> +	int ret;
> +
> +	ret = hid_parse(hdev);
> +	if (ret) {
> +		hid_err(hdev, "parse failed\n");
> +		return ret;
> +	}
> +
> +	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
> +	if (ret) {
> +		hid_err(hdev, "hw start failed\n");
> +		return ret;
> +	}
> +
> +	ret = stadiaff_init(hdev);
> +	if (ret) {
> +		dev_err(&hdev->dev, "force feedback init failed\n");

Error handling looks good to me now. Is there any particular reason you
use dev_err here instead of hid_err here?

-- Rahul Rameshbabu