cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hid-gfrm.c (3669B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * HID driver for Google Fiber TV Box remote controls
      4 *
      5 * Copyright (c) 2014-2015 Google Inc.
      6 *
      7 * Author: Petri Gynther <pgynther@google.com>
      8 */
      9#include <linux/device.h>
     10#include <linux/hid.h>
     11#include <linux/input.h>
     12#include <linux/module.h>
     13
     14#include "hid-ids.h"
     15
     16#define GFRM100  1  /* Google Fiber GFRM100 (Bluetooth classic) */
     17#define GFRM200  2  /* Google Fiber GFRM200 (Bluetooth LE) */
     18
     19#define GFRM100_SEARCH_KEY_REPORT_ID   0xF7
     20#define GFRM100_SEARCH_KEY_DOWN        0x0
     21#define GFRM100_SEARCH_KEY_AUDIO_DATA  0x1
     22#define GFRM100_SEARCH_KEY_UP          0x2
     23
     24static u8 search_key_dn[3] = {0x40, 0x21, 0x02};
     25static u8 search_key_up[3] = {0x40, 0x00, 0x00};
     26
     27static int gfrm_input_mapping(struct hid_device *hdev, struct hid_input *hi,
     28		struct hid_field *field, struct hid_usage *usage,
     29		unsigned long **bit, int *max)
     30{
     31	unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev);
     32
     33	if (hdev_type == GFRM100) {
     34		if (usage->hid == (HID_UP_CONSUMER | 0x4)) {
     35			/* Consumer.0004 -> KEY_INFO */
     36			hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_INFO);
     37			return 1;
     38		}
     39
     40		if (usage->hid == (HID_UP_CONSUMER | 0x41)) {
     41			/* Consumer.0041 -> KEY_OK */
     42			hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_OK);
     43			return 1;
     44		}
     45	}
     46
     47	return 0;
     48}
     49
     50static int gfrm_raw_event(struct hid_device *hdev, struct hid_report *report,
     51		u8 *data, int size)
     52{
     53	unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev);
     54	int ret = 0;
     55
     56	if (hdev_type != GFRM100)
     57		return 0;
     58
     59	if (size < 2 || data[0] != GFRM100_SEARCH_KEY_REPORT_ID)
     60		return 0;
     61
     62	/*
     63	 * Convert GFRM100 Search key reports into Consumer.0221 (Key.Search)
     64	 * reports. Ignore audio data.
     65	 */
     66	switch (data[1]) {
     67	case GFRM100_SEARCH_KEY_DOWN:
     68		ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_dn,
     69					   sizeof(search_key_dn), 1);
     70		break;
     71
     72	case GFRM100_SEARCH_KEY_AUDIO_DATA:
     73		break;
     74
     75	case GFRM100_SEARCH_KEY_UP:
     76		ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_up,
     77					   sizeof(search_key_up), 1);
     78		break;
     79
     80	default:
     81		break;
     82	}
     83
     84	return (ret < 0) ? ret : -1;
     85}
     86
     87static int gfrm_input_configured(struct hid_device *hid, struct hid_input *hidinput)
     88{
     89	/*
     90	 * Enable software autorepeat with:
     91	 * - repeat delay: 400 msec
     92	 * - repeat period: 100 msec
     93	 */
     94	input_enable_softrepeat(hidinput->input, 400, 100);
     95	return 0;
     96}
     97
     98static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id)
     99{
    100	int ret;
    101
    102	hid_set_drvdata(hdev, (void *) id->driver_data);
    103
    104	ret = hid_parse(hdev);
    105	if (ret)
    106		goto done;
    107
    108	if (id->driver_data == GFRM100) {
    109		/*
    110		 * GFRM100 HID Report Descriptor does not describe the Search
    111		 * key reports. Thus, we need to add it manually here, so that
    112		 * those reports reach gfrm_raw_event() from hid_input_report().
    113		 */
    114		if (!hid_register_report(hdev, HID_INPUT_REPORT,
    115					 GFRM100_SEARCH_KEY_REPORT_ID, 0)) {
    116			ret = -ENOMEM;
    117			goto done;
    118		}
    119	}
    120
    121	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
    122done:
    123	return ret;
    124}
    125
    126static const struct hid_device_id gfrm_devices[] = {
    127	{ HID_BLUETOOTH_DEVICE(0x58, 0x2000),
    128		.driver_data = GFRM100 },
    129	{ HID_BLUETOOTH_DEVICE(0x471, 0x2210),
    130		.driver_data = GFRM200 },
    131	{ }
    132};
    133MODULE_DEVICE_TABLE(hid, gfrm_devices);
    134
    135static struct hid_driver gfrm_driver = {
    136	.name = "gfrm",
    137	.id_table = gfrm_devices,
    138	.probe = gfrm_probe,
    139	.input_mapping = gfrm_input_mapping,
    140	.raw_event = gfrm_raw_event,
    141	.input_configured = gfrm_input_configured,
    142};
    143
    144module_hid_driver(gfrm_driver);
    145
    146MODULE_AUTHOR("Petri Gynther <pgynther@google.com>");
    147MODULE_DESCRIPTION("Google Fiber TV Box remote control driver");
    148MODULE_LICENSE("GPL");