drivers/usb/core/quirks.c

   1 /*
   2  * USB device quirk handling logic and table
   3  *
   4  * Copyright (c) 2007 Oliver Neukum
   5  * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation, version 2.
  10  *
  11  *
  12  */
  13
  14 #include <linux/usb.h>
  15 #include <linux/usb/quirks.h>
  16 #include "usb.h"
  17
  18 /* List of quirky USB devices.  Please keep this list ordered by:
  19  *      1) Vendor ID
  20  *      2) Product ID
  21  *      3) Class ID
  22  *
  23  * as we want specific devices to be overridden first, and only after that, any
  24  * class specific quirks.
  25  *
  26  * Right now the logic aborts if it finds a valid device in the table, we might
  27  * want to change that in the future if it turns out that a whole class of
  28  * devices is broken...
  29  */
  30 static const struct usb_device_id usb_quirk_list[] = {
  31         /* HP 5300/5370C scanner */
  32         { USB_DEVICE(0x03f0, 0x0701), .driver_info = USB_QUIRK_STRING_FETCH_255 },
  33         /* Seiko Epson Corp - Perfection 1670 */
  34         { USB_DEVICE(0x04b8, 0x011f), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
  35         /* Elsa MicroLink 56k (V.250) */
  36         { USB_DEVICE(0x05cc, 0x2267), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
  37
  38         { }  /* terminating entry must be last */
  39 };
  40
  41 static void usb_autosuspend_quirk(struct usb_device *udev)
  42 {
  43 #ifdef  CONFIG_USB_SUSPEND
  44         /* disable autosuspend, but allow the user to re-enable it via sysfs */
  45         udev->autosuspend_delay = 0;
  46 #endif
  47 }
  48
  49 static const struct usb_device_id *find_id(struct usb_device *udev)
  50 {
  51         const struct usb_device_id *id = usb_quirk_list;
  52
  53         for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
  54                         id->driver_info; id++) {
  55                 if (usb_match_device(udev, id))
  56                         return id;
  57         }
  58         return NULL;
  59 }
  60
  61 /*
  62  * Detect any quirks the device has, and do any housekeeping for it if needed.
  63  */
  64 void usb_detect_quirks(struct usb_device *udev)
  65 {
  66         const struct usb_device_id *id = usb_quirk_list;
  67
  68         id = find_id(udev);
  69         if (id)
  70                 udev->quirks = (u32)(id->driver_info);
  71         if (udev->quirks)
  72                 dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
  73                                 udev->quirks);
  74
  75         /* do any special quirk handling here if needed */
  76         if (udev->quirks & USB_QUIRK_NO_AUTOSUSPEND)
  77                 usb_autosuspend_quirk(udev);
  78 }