On Wed, 16 Dec 2009, Oliver Neukum wrote:
> From 98235db3d1a4eae545aad6efb116600feac8e373 Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <oliver@xxxxxxxxxx>
> Date: Wed, 16 Dec 2009 18:43:01 +0100
> Subject: [PATCH 2/2] usb:Export USB_QUIRK_RESET_MORPHS through sysfs
>
> Some devices which use mode switching revert to their
> primary mode as they are reset. They must not be reset for
> error handling. As user spaces makes the switch it also
> has to tell the kernel that a device is quirky.
>
> Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
> ---
> drivers/usb/core/sysfs.c | 30 ++++++++++++++++++++++++++++++
> 1 files changed, 30 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
> index 1547700..ae5095d 100644
> --- a/drivers/usb/core/sysfs.c
> +++ b/drivers/usb/core/sysfs.c
> @@ -181,6 +181,36 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
> static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
>
> static ssize_t
> +show_reset_quirk(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct usb_device *udev;
> +
> + udev = to_usb_device(dev);
> + return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET_MORPHS));
> +}
> +
> +static ssize_t
> +set_reset_quirk(struct device *dev, struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct usb_device *udev = to_usb_device(dev);
> + int config, value;
> +
> + if (sscanf(buf, "%d", &config) != 1 || config < 0 || config > 1)
> + return -EINVAL;
> + usb_lock_device(udev);
> + if (config)
> + udev->quirks |= USB_QUIRK_RESET_MORPHS;
> + else
> + udev->quirks &= ~USB_QUIRK_RESET_MORPHS;
> + usb_unlock_device(udev);
> + return count;
> +}
> +
> +static DEVICE_ATTR(breset_quirk, S_IRUGO | S_IWUSR,
> + show_reset_quirk, set_reset_quirk);
> +
> +static ssize_t
> show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
> {
> struct usb_device *udev;
Why do I get the feeling that something is missing here? :-)
Alan Stern
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