USB: add a blacklist for devices that can't handle some things we throw at them.

This adds a blacklist to the USB core to handle some autosuspend and
string issues that devices have.

Originally written by Oliver, but hacked up a lot by Greg.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
new file mode 100644
index 000000000000..ea0e48e9f611
--- /dev/null
+++ b/drivers/usb/core/quirks.c
@@ -0,0 +1,75 @@
+/*
+ * USB device quirk handling logic and table
+ *
+ * Copyright (c) 2007 Oliver Neukum
+ * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 2.
+ *
+ *
+ */
+
+#include <linux/usb.h>
+#include <linux/usb/quirks.h>
+#include "usb.h"
+
+/* List of quirky USB devices.  Please keep this list ordered by:
+ * 	1) Vendor ID
+ * 	2) Product ID
+ * 	3) Class ID
+ *
+ * as we want specific devices to be overridden first, and only after that, any
+ * class specific quirks.
+ *
+ * Right now the logic aborts if it finds a valid device in the table, we might
+ * want to change that in the future if it turns out that a whole class of
+ * devices is broken...
+ */
+static const struct usb_device_id usb_quirk_list[] = {
+	/* HP 5300/5370C scanner */
+	{ USB_DEVICE(0x03f0, 0x0701), .driver_info = USB_QUIRK_STRING_FETCH_255 },
+
+	/* Elsa MicroLink 56k (V.250) */
+	{ USB_DEVICE(0x05cc, 0x2267), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
+
+	{ }  /* terminating entry must be last */
+};
+
+static void usb_autosuspend_quirk(struct usb_device *udev)
+{
+	/* unbalanced resume to prevent autosuspends */
+	usb_autoresume_device(udev);
+}
+
+static const struct usb_device_id *find_id(struct usb_device *udev)
+{
+	const struct usb_device_id *id = usb_quirk_list;
+
+	for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
+			id->driver_info; id++) {
+		if (usb_match_device(udev, id))
+			return id;
+	}
+	return NULL;
+}
+
+/*
+ * Detect any quirks the device has, and do any housekeeping for it if needed.
+ */
+void usb_detect_quirks(struct usb_device *udev)
+{
+	const struct usb_device_id *id = usb_quirk_list;
+
+	id = find_id(udev);
+	if (id)
+		udev->quirks = (u32)(id->driver_info);
+	if (udev->quirks)
+		dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
+				udev->quirks);
+
+	/* do any special quirk handling here if needed */
+	if (udev->quirks & USB_QUIRK_NO_AUTOSUSPEND)
+		usb_autosuspend_quirk(udev);
+}