root/drivers/hid/hid-cherry.c

DEFINITIONS

1. ch_report_fixup
2. ch_input_mapping

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for some cherry "special" devices
   4  *
   5  *  Copyright (c) 1999 Andreas Gal
   6  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8  *  Copyright (c) 2006-2007 Jiri Kosina
   9  *  Copyright (c) 2008 Jiri Slaby
  10  */
  11 
  12 /*
  13  */
  14 
  15 #include <linux/device.h>
  16 #include <linux/hid.h>
  17 #include <linux/module.h>
  18 
  19 #include "hid-ids.h"
  20 
  21 /*
  22  * Cherry Cymotion keyboard have an invalid HID report descriptor,
  23  * that needs fixing before we can parse it.
  24  */
  25 static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  26                 unsigned int *rsize)
  27 {
  28         if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
  29                 hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
  30                 rdesc[11] = rdesc[16] = 0xff;
  31                 rdesc[12] = rdesc[17] = 0x03;
  32         }
  33         return rdesc;
  34 }
  35 
  36 #define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
  37                                         EV_KEY, (c))
  38 static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  39                 struct hid_field *field, struct hid_usage *usage,
  40                 unsigned long **bit, int *max)
  41 {
  42         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  43                 return 0;
  44 
  45         switch (usage->hid & HID_USAGE) {
  46         case 0x301: ch_map_key_clear(KEY_PROG1);        break;
  47         case 0x302: ch_map_key_clear(KEY_PROG2);        break;
  48         case 0x303: ch_map_key_clear(KEY_PROG3);        break;
  49         default:
  50                 return 0;
  51         }
  52 
  53         return 1;
  54 }
  55 
  56 static const struct hid_device_id ch_devices[] = {
  57         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
  58         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
  59         { }
  60 };
  61 MODULE_DEVICE_TABLE(hid, ch_devices);
  62 
  63 static struct hid_driver ch_driver = {
  64         .name = "cherry",
  65         .id_table = ch_devices,
  66         .report_fixup = ch_report_fixup,
  67         .input_mapping = ch_input_mapping,
  68 };
  69 module_hid_driver(ch_driver);
  70 
  71 MODULE_LICENSE("GPL");