cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hid-ite.c (4181B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * HID driver for some ITE "special" devices
      4 * Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
      5 */
      6
      7#include <linux/device.h>
      8#include <linux/input.h>
      9#include <linux/hid.h>
     10#include <linux/module.h>
     11
     12#include "hid-ids.h"
     13
     14#define QUIRK_TOUCHPAD_ON_OFF_REPORT		BIT(0)
     15
     16static __u8 *ite_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize)
     17{
     18	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
     19
     20	if (quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) {
     21		/* For Acer Aspire Switch 10 SW5-012 keyboard-dock */
     22		if (*rsize == 188 && rdesc[162] == 0x81 && rdesc[163] == 0x02) {
     23			hid_info(hdev, "Fixing up Acer Sw5-012 ITE keyboard report descriptor\n");
     24			rdesc[163] = HID_MAIN_ITEM_RELATIVE;
     25		}
     26		/* For Acer One S1002/S1003 keyboard-dock */
     27		if (*rsize == 188 && rdesc[185] == 0x81 && rdesc[186] == 0x02) {
     28			hid_info(hdev, "Fixing up Acer S1002/S1003 ITE keyboard report descriptor\n");
     29			rdesc[186] = HID_MAIN_ITEM_RELATIVE;
     30		}
     31		/* For Acer Aspire Switch 10E (SW3-016) keyboard-dock */
     32		if (*rsize == 210 && rdesc[184] == 0x81 && rdesc[185] == 0x02) {
     33			hid_info(hdev, "Fixing up Acer Aspire Switch 10E (SW3-016) ITE keyboard report descriptor\n");
     34			rdesc[185] = HID_MAIN_ITEM_RELATIVE;
     35		}
     36	}
     37
     38	return rdesc;
     39}
     40
     41static int ite_input_mapping(struct hid_device *hdev,
     42		struct hid_input *hi, struct hid_field *field,
     43		struct hid_usage *usage, unsigned long **bit,
     44		int *max)
     45{
     46
     47	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
     48
     49	if ((quirks & QUIRK_TOUCHPAD_ON_OFF_REPORT) &&
     50	    (usage->hid & HID_USAGE_PAGE) == 0x00880000) {
     51		if (usage->hid == 0x00880078) {
     52			/* Touchpad on, userspace expects F22 for this */
     53			hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F22);
     54			return 1;
     55		}
     56		if (usage->hid == 0x00880079) {
     57			/* Touchpad off, userspace expects F23 for this */
     58			hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_F23);
     59			return 1;
     60		}
     61		return -1;
     62	}
     63
     64	return 0;
     65}
     66
     67static int ite_event(struct hid_device *hdev, struct hid_field *field,
     68		     struct hid_usage *usage, __s32 value)
     69{
     70	struct input_dev *input;
     71
     72	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
     73		return 0;
     74
     75	input = field->hidinput->input;
     76
     77	/*
     78	 * The ITE8595 always reports 0 as value for the rfkill button. Luckily
     79	 * it is the only button in its report, and it sends a report on
     80	 * release only, so receiving a report means the button was pressed.
     81	 */
     82	if (usage->hid == HID_GD_RFKILL_BTN) {
     83		input_event(input, EV_KEY, KEY_RFKILL, 1);
     84		input_sync(input);
     85		input_event(input, EV_KEY, KEY_RFKILL, 0);
     86		input_sync(input);
     87		return 1;
     88	}
     89
     90	return 0;
     91}
     92
     93static int ite_probe(struct hid_device *hdev, const struct hid_device_id *id)
     94{
     95	int ret;
     96
     97	hid_set_drvdata(hdev, (void *)id->driver_data);
     98
     99	ret = hid_open_report(hdev);
    100	if (ret)
    101		return ret;
    102
    103	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
    104}
    105
    106static const struct hid_device_id ite_devices[] = {
    107	{ HID_USB_DEVICE(USB_VENDOR_ID_ITE, USB_DEVICE_ID_ITE8595) },
    108	{ HID_USB_DEVICE(USB_VENDOR_ID_258A, USB_DEVICE_ID_258A_6A88) },
    109	/* ITE8595 USB kbd ctlr, with Synaptics touchpad connected to it. */
    110	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
    111		     USB_VENDOR_ID_SYNAPTICS,
    112		     USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012),
    113	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
    114	/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
    115	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
    116		     USB_VENDOR_ID_SYNAPTICS,
    117		     USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1002),
    118	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
    119	/* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */
    120	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
    121		     USB_VENDOR_ID_SYNAPTICS,
    122		     USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003),
    123	  .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT },
    124	{ }
    125};
    126MODULE_DEVICE_TABLE(hid, ite_devices);
    127
    128static struct hid_driver ite_driver = {
    129	.name = "itetech",
    130	.id_table = ite_devices,
    131	.probe = ite_probe,
    132	.report_fixup = ite_report_fixup,
    133	.input_mapping = ite_input_mapping,
    134	.event = ite_event,
    135};
    136module_hid_driver(ite_driver);
    137
    138MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
    139MODULE_LICENSE("GPL");