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Linux/drivers/hid/hid-cherry.c

  1 /*
  2  *  HID driver for some cherry "special" devices
  3  *
  4  *  Copyright (c) 1999 Andreas Gal
  5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  7  *  Copyright (c) 2006-2007 Jiri Kosina
  8  *  Copyright (c) 2008 Jiri Slaby
  9  */
 10 
 11 /*
 12  * This program is free software; you can redistribute it and/or modify it
 13  * under the terms of the GNU General Public License as published by the Free
 14  * Software Foundation; either version 2 of the License, or (at your option)
 15  * any later version.
 16  */
 17 
 18 #include <linux/device.h>
 19 #include <linux/hid.h>
 20 #include <linux/module.h>
 21 
 22 #include "hid-ids.h"
 23 
 24 /*
 25  * Cherry Cymotion keyboard have an invalid HID report descriptor,
 26  * that needs fixing before we can parse it.
 27  */
 28 static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 29                 unsigned int *rsize)
 30 {
 31         if (*rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
 32                 hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
 33                 rdesc[11] = rdesc[16] = 0xff;
 34                 rdesc[12] = rdesc[17] = 0x03;
 35         }
 36         return rdesc;
 37 }
 38 
 39 #define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
 40                                         EV_KEY, (c))
 41 static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 42                 struct hid_field *field, struct hid_usage *usage,
 43                 unsigned long **bit, int *max)
 44 {
 45         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
 46                 return 0;
 47 
 48         switch (usage->hid & HID_USAGE) {
 49         case 0x301: ch_map_key_clear(KEY_PROG1);        break;
 50         case 0x302: ch_map_key_clear(KEY_PROG2);        break;
 51         case 0x303: ch_map_key_clear(KEY_PROG3);        break;
 52         default:
 53                 return 0;
 54         }
 55 
 56         return 1;
 57 }
 58 
 59 static const struct hid_device_id ch_devices[] = {
 60         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
 61         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
 62         { }
 63 };
 64 MODULE_DEVICE_TABLE(hid, ch_devices);
 65 
 66 static struct hid_driver ch_driver = {
 67         .name = "cherry",
 68         .id_table = ch_devices,
 69         .report_fixup = ch_report_fixup,
 70         .input_mapping = ch_input_mapping,
 71 };
 72 module_hid_driver(ch_driver);
 73 
 74 MODULE_LICENSE("GPL");
 75 

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