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         /* Philips PSC805 audio device */
  39         { USB_DEVICE(0x0471, 0x0155), .driver_info = USB_QUIRK_RESET_RESUME },
  40
  41         { }  /* terminating entry must be last */
  42 };
  43
  44 static void usb_autosuspend_quirk(struct usb_device *udev)
  45 {
  46 #ifdef  CONFIG_USB_SUSPEND
  47         /* disable autosuspend, but allow the user to re-enable it via sysfs */
  48         udev->autosuspend_disabled = 1;
  49 #endif
  50 }
  51
  52 static const struct usb_device_id *find_id(struct usb_device *udev)
  53 {
  54         const struct usb_device_id *id = usb_quirk_list;
  55
  56         for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
  57                         id->driver_info; id++) {
  58                 if (usb_match_device(udev, id))
  59                         return id;
  60         }
  61         return NULL;
  62 }
  63
  64 /*
  65  * Detect any quirks the device has, and do any housekeeping for it if needed.
  66  */
  67 void usb_detect_quirks(struct usb_device *udev)
  68 {
  69         const struct usb_device_id *id = usb_quirk_list;
  70
  71         id = find_id(udev);
  72         if (id)
  73                 udev->quirks = (u32)(id->driver_info);
  74         if (udev->quirks)
  75                 dev_dbg(&udev->dev, "USB quirks for this device: %x\n",
  76                                 udev->quirks);
  77
  78         /* do any special quirk handling here if needed */
  79         if (udev->quirks & USB_QUIRK_NO_AUTOSUSPEND)
  80                 usb_autosuspend_quirk(udev);
  81 }