linux-kernel - Re: [PATCH 3/3] ideapad: Show negative when no camera

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Date:	Thu, 2 Jun 2011 11:43:25 +0200
From:	Corentin Chary <corentin.chary@...il.com>
To:	Ike Panhc <ike.pan@...onical.com>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 3/3] ideapad: Show negative when no camera

On Thu, Jun 2, 2011 at 11:24 AM, Ike Panhc <ike.pan@...onical.com> wrote:
> Signed-off-by: Ike Panhc <ike.pan@...onical.com>
> ---
>  drivers/platform/x86/ideapad-laptop.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index 9c09891..4a54ed1 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -38,6 +38,7 @@
>  #define CFG_BT_BIT     (16)
>  #define CFG_3G_BIT     (17)
>  #define CFG_WIFI_BIT   (18)
> +#define CFG_CAMERA_BIT (19)
>
>  struct ideapad_private {
>        struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
> @@ -199,6 +200,10 @@ static ssize_t show_ideapad_cam(struct device *dev,
>                                struct device_attribute *attr,
>                                char *buf)
>  {
> +       struct ideapad_private *priv = dev_get_drvdata(dev);
> +
> +       if (!test_bit(CFG_CAMERA_BIT, &(priv->cfg)))
> +               return sprintf(buf, "-1\n");
>        return show_ideapad_helper(dev, attr, buf, 0x1D);
>  }
>
> --
> 1.7.4.1
>
> --
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>

I think it would be better to not add the file when the camera is not
available. Another option is to return -ENODEV. But printing -1
doesn't seems right.

-- 
Corentin Chary
http://xf.iksaif.net
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