[PATCH] libertas: prioritize usb8388_v5.bin firmware on OLPC machines

[Andres Salomon]

Note: I've not tested this out yet on an XO-1.  I'll do that after some
feedback regarding the matching linux-firmware pull request.  This
should address dsd's concern about changing the loading order of the
firmware.

On Sun, 31 Jul 2011
00:03:00 -0700 Andres Salomon <dilinger at queued.net> wrote:

> Normally, the v9 firmware will be loaded if it's available.  However,
> on OLPC XO-1 machines, the v5 firmware supports extra functionality.
> This makes the libertas driver attempt to load the v5 firmware first
> if the machine is an OLPC machine; if that fails (or it's not an OLPC
> machine), fall back to attempting to load the other firmwares.
> 
> Signed-off-by: Andres Salomon <dilinger at queued.net>
> ---
>  drivers/net/wireless/libertas/if_usb.c |   24
> ++++++++++++++++++++++++ 1 files changed, 24 insertions(+), 0
> deletions(-)
> 
> diff --git a/drivers/net/wireless/libertas/if_usb.c
> b/drivers/net/wireless/libertas/if_usb.c index b5acc39..6a2e70e 100644
> --- a/drivers/net/wireless/libertas/if_usb.c
> +++ b/drivers/net/wireless/libertas/if_usb.c
> @@ -973,6 +973,26 @@ static const struct {
>  	{ MODEL_8682, "libertas/usb8682.bin" }
>  };
>  
> +#ifdef CONFIG_OLPC
> +
> +/* default OLPC firmware to try; index into fw_table above */
> +#define OLPC_FW 1
> +
> +static int try_olpc_fw(struct if_usb_card *cardp)
> +{
> +	int retval = -ENOENT;
> +
> +	/* try the OLPC firmware first; fall back to any others */
> +	if (machine_is_olpc())
> +		retval = request_firmware(&cardp->fw,
> +				fw_table[OLPC_FW].fwname,
> &cardp->udev->dev);
> +	return retval;
> +}
> +
> +#else
> +static int try_olpc_fw(struct if_usb_card *cardp) { return -ENOENT; }
> +#endif /* !CONFIG_OLPC */
> +
>  static int get_fw(struct if_usb_card *cardp, const char *fwname)
>  {
>  	int i;
> @@ -981,6 +1001,10 @@ static int get_fw(struct if_usb_card *cardp,
> const char *fwname) if (fwname)
>  		return request_firmware(&cardp->fw, fwname,
> &cardp->udev->dev); 
> +	/* Handle OLPC firmware */
> +	if (try_olpc_fw(cardp) == 0)
> +		return 0;
> +
>  	/* Otherwise search for firmware to use */
>  	for (i = 0; i < ARRAY_SIZE(fw_table); i++) {
>  		if (fw_table[i].model != cardp->model)