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"); 72