USB: Export 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@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
5d3987796c
commit
ef955341f6
|
@ -159,3 +159,14 @@ Description:
|
|||
device. This is useful to ensure auto probing won't
|
||||
match the driver to the device. For example:
|
||||
# echo "046d c315" > /sys/bus/usb/drivers/foo/remove_id
|
||||
|
||||
What: /sys/bus/usb/device/.../avoid_reset
|
||||
Date: December 2009
|
||||
Contact: Oliver Neukum <oliver@neukum.org>
|
||||
Description:
|
||||
Writing 1 to this file tells the kernel that this
|
||||
device will morph into another mode when it is reset.
|
||||
Drivers will not use reset for error handling for
|
||||
such devices.
|
||||
Users:
|
||||
usb_modeswitch
|
||||
|
|
|
@ -190,6 +190,36 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf)
|
|||
}
|
||||
static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
|
||||
|
||||
static ssize_t
|
||||
show_avoid_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_avoid_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;
|
||||
|
||||
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(avoid_reset_quirk, S_IRUGO | S_IWUSR,
|
||||
show_avoid_reset_quirk, set_avoid_reset_quirk);
|
||||
|
||||
static ssize_t
|
||||
show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
|
||||
{
|
||||
|
@ -558,6 +588,7 @@ static struct attribute *dev_attrs[] = {
|
|||
&dev_attr_version.attr,
|
||||
&dev_attr_maxchild.attr,
|
||||
&dev_attr_quirks.attr,
|
||||
&dev_attr_avoid_reset_quirk.attr,
|
||||
&dev_attr_authorized.attr,
|
||||
&dev_attr_remove.attr,
|
||||
NULL,
|
||||
|
|
Loading…
Reference in a new issue