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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for EVision devices
* For now, only ignore bogus consumer reports
* sent after the keyboard has been configured
*
* Copyright (c) 2022 Philippe Valembois
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"
static int evision_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
/* mapping only applies to USB_DEVICE_ID_EVISION_ICL01 */
if (hdev->product != USB_DEVICE_ID_EVISION_ICL01)
return 0;
if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
return 0;
/* Ignore key down event */
if ((usage->hid & HID_USAGE) >> 8 == 0x05)
return -1;
/* Ignore key up event */
if ((usage->hid & HID_USAGE) >> 8 == 0x06)
return -1;
switch (usage->hid & HID_USAGE) {
/* Ignore configuration saved event */
case 0x0401: return -1;
/* Ignore reset event */
case 0x0402: return -1;
}
return 0;
}
#define REP_DSC_SIZE 236
#define USAGE_MAX_INDEX 59
static const __u8 *evision_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
if (hdev->product == USB_DEVICE_ID_EV_TELINK_RECEIVER &&
*rsize == REP_DSC_SIZE && rdesc[USAGE_MAX_INDEX] == 0x29 &&
rdesc[USAGE_MAX_INDEX + 1] == 3) {
hid_info(hdev, "fixing EVision:TeLink Receiver report descriptor\n");
rdesc[USAGE_MAX_INDEX + 1] = 5; // change usage max from 3 to 5
}
return rdesc;
}
static const struct hid_device_id evision_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_EVISION, USB_DEVICE_ID_EVISION_ICL01) },
{ HID_USB_DEVICE(USB_VENDOR_ID_EVISION, USB_DEVICE_ID_EV_TELINK_RECEIVER) },
{ }
};
MODULE_DEVICE_TABLE(hid, evision_devices);
static struct hid_driver evision_driver = {
.name = "evision",
.id_table = evision_devices,
.input_mapping = evision_input_mapping,
.report_fixup = evision_report_fixup,
};
module_hid_driver(evision_driver);
MODULE_DESCRIPTION("HID driver for EVision devices");
MODULE_LICENSE("GPL");
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