drivers/hid/hid-cherry.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  HID driver for some cherry "special" devices
0004  *
0005  *  Copyright (c) 1999 Andreas Gal
0006  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
0007  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
0008  *  Copyright (c) 2006-2007 Jiri Kosina
0009  *  Copyright (c) 2008 Jiri Slaby
0010  */
0011
0012 /*
0013  */
0014
0015 #include <linux/device.h>
0016 #include <linux/hid.h>
0017 #include <linux/module.h>
0018
0019 #include "hid-ids.h"
0020
0021 /*
0022  * Cherry Cymotion keyboard have an invalid HID report descriptor,
0023  * that needs fixing before we can parse it.
0024  */
0025 static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
0026         unsigned int *rsize)
0027 {
0028     if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
0029         hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
0030         rdesc[11] = rdesc[16] = 0xff;
0031         rdesc[12] = rdesc[17] = 0x03;
0032     }
0033     return rdesc;
0034 }
0035
0036 #define ch_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
0037                     EV_KEY, (c))
0038 static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
0039         struct hid_field *field, struct hid_usage *usage,
0040         unsigned long **bit, int *max)
0041 {
0042     if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
0043         return 0;
0044
0045     switch (usage->hid & HID_USAGE) {
0046     case 0x301: ch_map_key_clear(KEY_PROG1);    break;
0047     case 0x302: ch_map_key_clear(KEY_PROG2);    break;
0048     case 0x303: ch_map_key_clear(KEY_PROG3);    break;
0049     default:
0050         return 0;
0051     }
0052
0053     return 1;
0054 }
0055
0056 static const struct hid_device_id ch_devices[] = {
0057     { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
0058     { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
0059     { }
0060 };
0061 MODULE_DEVICE_TABLE(hid, ch_devices);
0062
0063 static struct hid_driver ch_driver = {
0064     .name = "cherry",
0065     .id_table = ch_devices,
0066     .report_fixup = ch_report_fixup,
0067     .input_mapping = ch_input_mapping,
0068 };
0069 module_hid_driver(ch_driver);
0070
0071 MODULE_LICENSE("GPL");