>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;
--
1.6.4.2
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