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-zydacron.c (4030B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3*  HID driver for zydacron remote control
      4*
      5*  Copyright (c) 2010 Don Prince <dhprince.devel@yahoo.co.uk>
      6*/
      7
      8/*
      9*/
     10
     11#include <linux/device.h>
     12#include <linux/hid.h>
     13#include <linux/module.h>
     14
     15#include "hid-ids.h"
     16
     17struct zc_device {
     18	struct input_dev	*input_ep81;
     19	unsigned short		last_key[4];
     20};
     21
     22
     23/*
     24* Zydacron remote control has an invalid HID report descriptor,
     25* that needs fixing before we can parse it.
     26*/
     27static __u8 *zc_report_fixup(struct hid_device *hdev, __u8 *rdesc,
     28	unsigned int *rsize)
     29{
     30	if (*rsize >= 253 &&
     31		rdesc[0x96] == 0xbc && rdesc[0x97] == 0xff &&
     32		rdesc[0xca] == 0xbc && rdesc[0xcb] == 0xff &&
     33		rdesc[0xe1] == 0xbc && rdesc[0xe2] == 0xff) {
     34			hid_info(hdev,
     35				"fixing up zydacron remote control report descriptor\n");
     36			rdesc[0x96] = rdesc[0xca] = rdesc[0xe1] = 0x0c;
     37			rdesc[0x97] = rdesc[0xcb] = rdesc[0xe2] = 0x00;
     38		}
     39	return rdesc;
     40}
     41
     42#define zc_map_key_clear(c) \
     43	hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
     44
     45static int zc_input_mapping(struct hid_device *hdev, struct hid_input *hi,
     46	struct hid_field *field, struct hid_usage *usage,
     47	unsigned long **bit, int *max)
     48{
     49	int i;
     50	struct zc_device *zc = hid_get_drvdata(hdev);
     51	zc->input_ep81 = hi->input;
     52
     53	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
     54		return 0;
     55
     56	dbg_hid("zynacron input mapping event [0x%x]\n",
     57		usage->hid & HID_USAGE);
     58
     59	switch (usage->hid & HID_USAGE) {
     60	/* report 2 */
     61	case 0x10:
     62		zc_map_key_clear(KEY_MODE);
     63		break;
     64	case 0x30:
     65		zc_map_key_clear(KEY_SCREEN);
     66		break;
     67	case 0x70:
     68		zc_map_key_clear(KEY_INFO);
     69		break;
     70	/* report 3 */
     71	case 0x04:
     72		zc_map_key_clear(KEY_RADIO);
     73		break;
     74	/* report 4 */
     75	case 0x0d:
     76		zc_map_key_clear(KEY_PVR);
     77		break;
     78	case 0x25:
     79		zc_map_key_clear(KEY_TV);
     80		break;
     81	case 0x47:
     82		zc_map_key_clear(KEY_AUDIO);
     83		break;
     84	case 0x49:
     85		zc_map_key_clear(KEY_AUX);
     86		break;
     87	case 0x4a:
     88		zc_map_key_clear(KEY_VIDEO);
     89		break;
     90	case 0x48:
     91		zc_map_key_clear(KEY_DVD);
     92		break;
     93	case 0x24:
     94		zc_map_key_clear(KEY_MENU);
     95		break;
     96	case 0x32:
     97		zc_map_key_clear(KEY_TEXT);
     98		break;
     99	default:
    100		return 0;
    101	}
    102
    103	for (i = 0; i < 4; i++)
    104		zc->last_key[i] = 0;
    105
    106	return 1;
    107}
    108
    109static int zc_raw_event(struct hid_device *hdev, struct hid_report *report,
    110	 u8 *data, int size)
    111{
    112	struct zc_device *zc = hid_get_drvdata(hdev);
    113	int ret = 0;
    114	unsigned key;
    115	unsigned short index;
    116
    117	if (report->id == data[0]) {
    118
    119		/* break keys */
    120		for (index = 0; index < 4; index++) {
    121			key = zc->last_key[index];
    122			if (key) {
    123				input_event(zc->input_ep81, EV_KEY, key, 0);
    124				zc->last_key[index] = 0;
    125			}
    126		}
    127
    128		key = 0;
    129		switch (report->id) {
    130		case 0x02:
    131		case 0x03:
    132			switch (data[1]) {
    133			case 0x10:
    134				key = KEY_MODE;
    135				index = 0;
    136				break;
    137			case 0x30:
    138				key = KEY_SCREEN;
    139				index = 1;
    140				break;
    141			case 0x70:
    142				key = KEY_INFO;
    143				index = 2;
    144				break;
    145			case 0x04:
    146				key = KEY_RADIO;
    147				index = 3;
    148				break;
    149			}
    150
    151			if (key) {
    152				input_event(zc->input_ep81, EV_KEY, key, 1);
    153				zc->last_key[index] = key;
    154			}
    155
    156			ret = 1;
    157			break;
    158		}
    159	}
    160
    161	return ret;
    162}
    163
    164static int zc_probe(struct hid_device *hdev, const struct hid_device_id *id)
    165{
    166	int ret;
    167	struct zc_device *zc;
    168
    169	zc = devm_kzalloc(&hdev->dev, sizeof(*zc), GFP_KERNEL);
    170	if (zc == NULL) {
    171		hid_err(hdev, "can't alloc descriptor\n");
    172		return -ENOMEM;
    173	}
    174
    175	hid_set_drvdata(hdev, zc);
    176
    177	ret = hid_parse(hdev);
    178	if (ret) {
    179		hid_err(hdev, "parse failed\n");
    180		return ret;
    181	}
    182
    183	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
    184	if (ret) {
    185		hid_err(hdev, "hw start failed\n");
    186		return ret;
    187	}
    188
    189	return 0;
    190}
    191
    192static const struct hid_device_id zc_devices[] = {
    193	{ HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
    194	{ }
    195};
    196MODULE_DEVICE_TABLE(hid, zc_devices);
    197
    198static struct hid_driver zc_driver = {
    199	.name = "zydacron",
    200	.id_table = zc_devices,
    201	.report_fixup = zc_report_fixup,
    202	.input_mapping = zc_input_mapping,
    203	.raw_event = zc_raw_event,
    204	.probe = zc_probe,
    205};
    206module_hid_driver(zc_driver);
    207
    208MODULE_LICENSE("GPL");