| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 3 | * HID driver for some cherry "special" devices |
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| 4 | * |
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| 5 | * Copyright (c) 1999 Andreas Gal |
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| 6 | * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> |
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| 7 | * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc |
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| 8 | * Copyright (c) 2006-2007 Jiri Kosina |
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| 9 | * Copyright (c) 2008 Jiri Slaby |
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| 10 | */ |
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| 11 | |
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| 12 | /* |
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| 13 | */ |
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| 14 | |
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| 15 | #include <linux/device.h> |
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| 16 | #include <linux/hid.h> |
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| 17 | #include <linux/module.h> |
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| 18 | |
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| 19 | #include "hid-ids.h" |
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| 20 | |
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| 21 | /* |
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| 22 | * Cherry Cymotion keyboard have an invalid HID report descriptor, |
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| 23 | * that needs fixing before we can parse it. |
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| 24 | */ |
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| 25 | static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
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| 26 | unsigned int *rsize) |
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| 27 | { |
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| 28 | if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) { |
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| 29 | hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n" ); |
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| 30 | rdesc[11] = rdesc[16] = 0xff; |
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| 31 | rdesc[12] = rdesc[17] = 0x03; |
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| 32 | } |
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| 33 | return rdesc; |
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| 34 | } |
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| 35 | |
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| 36 | #define ch_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \ |
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| 37 | EV_KEY, (c)) |
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| 38 | static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi, |
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| 39 | struct hid_field *field, struct hid_usage *usage, |
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| 40 | unsigned long **bit, int *max) |
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| 41 | { |
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| 42 | if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER) |
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| 43 | return 0; |
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| 44 | |
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| 45 | switch (usage->hid & HID_USAGE) { |
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| 46 | case 0x301: ch_map_key_clear(KEY_PROG1); break; |
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| 47 | case 0x302: ch_map_key_clear(KEY_PROG2); break; |
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| 48 | case 0x303: ch_map_key_clear(KEY_PROG3); break; |
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| 49 | default: |
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| 50 | return 0; |
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| 51 | } |
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| 52 | |
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| 53 | return 1; |
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| 54 | } |
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| 55 | |
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| 56 | static const struct hid_device_id ch_devices[] = { |
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| 57 | { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) }, |
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| 58 | { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) }, |
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| 59 | { } |
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| 60 | }; |
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| 61 | MODULE_DEVICE_TABLE(hid, ch_devices); |
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| 62 | |
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| 63 | static struct hid_driver ch_driver = { |
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| 64 | .name = "cherry" , |
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| 65 | .id_table = ch_devices, |
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| 66 | .report_fixup = ch_report_fixup, |
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| 67 | .input_mapping = ch_input_mapping, |
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| 68 | }; |
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| 69 | module_hid_driver(ch_driver); |
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| 70 | |
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| 71 | MODULE_LICENSE("GPL" ); |
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| 72 | |
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