linux-kernel - Re: [PATCH v1 2/7] HID: playstation: DS4: Don't fail on MAC address request

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Message-ID: <CAEc3jaD9qXp=F6Xfg8bdeC1Hv5pHiKA16SBd=-ac74ibE1ELyw@mail.gmail.com>
Date: Wed, 24 Jan 2024 16:39:56 -0800
From: Roderick Colenbrander <thunderbird2k@...il.com>
To: Max Staudt <max@...as.org>
Cc: Roderick Colenbrander <roderick.colenbrander@...y.com>, Jiri Kosina <jikos@...nel.org>, 
	Benjamin Tissoires <benjamin.tissoires@...hat.com>, linux-input@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/7] HID: playstation: DS4: Don't fail on MAC address request

On Mon, Jan 15, 2024 at 6:58 AM Max Staudt <max@...as.org> wrote:
>
> Some third-party controllers can't report their MAC address.
>
> Since a unique ID is needed for ps_devices_list_add() and
> ps_device_register_battery(), let's use hdev->id for this when we don't
> have a MAC address.
>
> Signed-off-by: Max Staudt <max@...as.org>
> ---
>  drivers/hid/hid-playstation.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c
> index 7f50e13601f0..0a3c442af305 100644
> --- a/drivers/hid/hid-playstation.c
> +++ b/drivers/hid/hid-playstation.c
> @@ -1966,7 +1966,10 @@ static int dualshock4_get_mac_address(struct dualshock4 *ds4)
>                                 DS4_FEATURE_REPORT_PAIRING_INFO_SIZE, false);
>                 if (ret) {
>                         hid_err(hdev, "Failed to retrieve DualShock4 pairing info: %d\n", ret);
> -                       goto err_free;
> +                       hid_err(hdev, "Generating fake MAC address for this device.\n");
> +                       buf[1] = (hdev->id >>  0) & 0xff;
> +                       buf[2] = (hdev->id >>  8) & 0xff;
> +                       buf[3] = (hdev->id >> 16) & 0xff;
>                 }
>
>                 memcpy(ds4->base.mac_address, &buf[1], sizeof(ds4->base.mac_address));
> @@ -1986,7 +1989,6 @@ static int dualshock4_get_mac_address(struct dualshock4 *ds4)
>                 return 0;
>         }
>
> -err_free:
>         kfree(buf);
>         return ret;
>  }
> @@ -2552,7 +2554,7 @@ static struct ps_device *dualshock4_create(struct hid_device *hdev)
>         ret = dualshock4_get_mac_address(ds4);
>         if (ret) {
>                 hid_err(hdev, "Failed to get MAC address from DualShock4\n");
> -               return ERR_PTR(ret);
> +               hid_err(hdev, "Can't detect simultaneous USB/BT connections from this device.\n");
>         }
>         snprintf(hdev->uniq, sizeof(hdev->uniq), "%pMR", ds4->base.mac_address);
>
> --
> 2.39.2
>
>

Hi Max,

For what type of devices is this not working? This one example of this
request which is very foundational for a controller working on even
the game console. Are this perhaps USB-only devices? If the case maybe
some kind of error is only needed for USB connections.

Thanks,
Roderick