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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/hid/hid-cherry.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 *  HID driver for some cherry "special" devices

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 *

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 *  Copyright (c) 1999 Andreas Gal

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 *  Copyright (c) 2000-2005 Vojtech Pavlik <[email protected]>

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 *  Copyright (c) 2005 Michael Haboustak <[email protected]> for Concept2, Inc

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 *  Copyright (c) 2006-2007 Jiri Kosina

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 *  Copyright (c) 2008 Jiri Slaby

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 */

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/*

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 */

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#include <linux/device.h>

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#include <linux/hid.h>

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#include <linux/module.h>

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#include "hid-ids.h"

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/*

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 * Cherry Cymotion keyboard have an invalid HID report descriptor,

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 * that needs fixing before we can parse it.

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 */

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static const __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,

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		unsigned int *rsize)

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{

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	if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {

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		hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");

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		rdesc[11] = rdesc[16] = 0xff;

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		rdesc[12] = rdesc[17] = 0x03;

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	}

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	return rdesc;

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}

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#define ch_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \

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					EV_KEY, (c))

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static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,

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		struct hid_field *field, struct hid_usage *usage,

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		unsigned long **bit, int *max)

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{

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	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)

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		return 0;

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	switch (usage->hid & HID_USAGE) {

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	case 0x301: ch_map_key_clear(KEY_PROG1);	break;

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	case 0x302: ch_map_key_clear(KEY_PROG2);	break;

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	case 0x303: ch_map_key_clear(KEY_PROG3);	break;

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	default:

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		return 0;

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	}

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	return 1;

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}

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static const struct hid_device_id ch_devices[] = {

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	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },

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	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },

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	{ }

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};

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MODULE_DEVICE_TABLE(hid, ch_devices);

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static struct hid_driver ch_driver = {

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	.name = "cherry",

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	.id_table = ch_devices,

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	.report_fixup = ch_report_fixup,

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	.input_mapping = ch_input_mapping,

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};

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module_hid_driver(ch_driver);

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MODULE_DESCRIPTION("HID driver for some cherry \"special\" devices");

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MODULE_LICENSE("GPL");

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