210 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3* HID driver for zydacron remote control4*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 const __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_DESCRIPTION("HID driver for zydacron remote control");209MODULE_LICENSE("GPL");210