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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * HID driver for Google Fiber TV Box remote controls4 *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 0xF720#define GFRM100_SEARCH_KEY_DOWN 0x021#define GFRM100_SEARCH_KEY_AUDIO_DATA 0x122#define GFRM100_SEARCH_KEY_UP 0x223 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 msec92 * - repeat period: 100 msec93 */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 Search111 * key reports. Thus, we need to add it manually here, so that112 * 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");149