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// SPDX-License-Identifier: GPL-2.0-only
/*
* HID driver for some ITE "special" devices
* Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"
#define QUIRK_TOUCHPAD_ON_OFF_REPORT BIT(0)
static __u8 *ite_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
if (quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) {
if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
hid_info(hdev, "Fixing up ITE keyboard report descriptor\n");
rdesc[163] = HID_MAIN_ITEM_RELATIVE;
}
}
return rdesc;
}
static int ite_input_mapping(struct hid_device *hdev,
struct hid_input *hi, struct hid_field *field,
struct hid_usage *usage, unsigned long **bit,
int *max)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
(usage->hid & HID_USAGE_PAGE) == 0x00880000) {
if (usage->hid == 0x00880078) {
/* Touchpad on, userspace expects F22 for this */
hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
return 1;
}
if (usage->hid == 0x00880079) {
/* Touchpad off, userspace expects F23 for this */
hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
return 1;
}
return -1;
}
return 0;
}
static int ite_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct input_dev *input;
if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
return 0;
input = field->hidinput->input;
/*
* The ITE8595 always reports 0 as value for the rfkill button. Luckily
* it is the only button in its report, and it sends a report on
* release only, so receiving a report means the button was pressed.
*/
if (usage->hid == HID_GD_RFKILL_BTN) {
input_event(input, EV_KEY, KEY_RFKILL, 1);
input_sync(input);
input_event(input, EV_KEY, KEY_RFKILL, 0);
input_sync(input);
return 1;
}
return 0;
}
static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
hid_set_drvdata(hdev, (void *)id->driver_data);
ret = hid_open_report(hdev);
if (ret)
return ret;
return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
}
static const struct hid_device_id ite_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
{ HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
/* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
USB_VENDOR_ID_SYNAPTICS,
USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
.driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
USB_VENDOR_ID_SYNAPTICS,
USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003) },
{ }
};
MODULE_DEVICE_TABLE(hid, ite_devices);
static struct hid_driver ite_driver = {
.name = "itetech",
.id_table = ite_devices,
.probe = ite_probe,
.report_fixup = ite_report_fixup,
.input_mapping = ite_input_mapping,
.event = ite_event,
};
module_hid_driver(ite_driver);
MODULE_LICENSE("GPL");
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