LXR linux/drivers/hid/hid-cherry.c

   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 */
  25static __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))
  38static 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
  56static 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};
  61MODULE_DEVICE_TABLE(hid, ch_devices);
  62
  63static 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};
  69module_hid_driver(ch_driver);
  70
  71MODULE_LICENSE("GPL");
  72