1 /* 2 * HID driver for Google Fiber TV Box remote controls 3 * 4 * Copyright (c) 2014-2015 Google Inc. 5 * 6 * Author: Petri Gynther <pgynther@google.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 */ 13 #include <linux/device.h> 14 #include <linux/hid.h> 15 #include <linux/input.h> 16 #include <linux/module.h> 17 18 #include "hid-ids.h" 19 20 #define GFRM100 1 /* Google Fiber GFRM100 (Bluetooth classic) */ 21 #define GFRM200 2 /* Google Fiber GFRM200 (Bluetooth LE) */ 22 23 #define GFRM100_SEARCH_KEY_REPORT_ID 0xF7 24 #define GFRM100_SEARCH_KEY_DOWN 0x0 25 #define GFRM100_SEARCH_KEY_AUDIO_DATA 0x1 26 #define GFRM100_SEARCH_KEY_UP 0x2 27 28 static u8 search_key_dn[3] = {0x40, 0x21, 0x02}; 29 static u8 search_key_up[3] = {0x40, 0x00, 0x00}; 30 31 static int gfrm_input_mapping(struct hid_device *hdev, struct hid_input *hi, 32 struct hid_field *field, struct hid_usage *usage, 33 unsigned long **bit, int *max) 34 { 35 unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev); 36 37 if (hdev_type == GFRM100) { 38 if (usage->hid == (HID_UP_CONSUMER | 0x4)) { 39 /* Consumer.0004 -> KEY_INFO */ 40 hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_INFO); 41 return 1; 42 } 43 44 if (usage->hid == (HID_UP_CONSUMER | 0x41)) { 45 /* Consumer.0041 -> KEY_OK */ 46 hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_OK); 47 return 1; 48 } 49 } 50 51 return 0; 52 } 53 54 static int gfrm_raw_event(struct hid_device *hdev, struct hid_report *report, 55 u8 *data, int size) 56 { 57 unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev); 58 int ret = 0; 59 60 if (hdev_type != GFRM100) 61 return 0; 62 63 if (size < 2 || data[0] != GFRM100_SEARCH_KEY_REPORT_ID) 64 return 0; 65 66 /* 67 * Convert GFRM100 Search key reports into Consumer.0221 (Key.Search) 68 * reports. Ignore audio data. 69 */ 70 switch (data[1]) { 71 case GFRM100_SEARCH_KEY_DOWN: 72 ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_dn, 73 sizeof(search_key_dn), 1); 74 break; 75 76 case GFRM100_SEARCH_KEY_AUDIO_DATA: 77 break; 78 79 case GFRM100_SEARCH_KEY_UP: 80 ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_up, 81 sizeof(search_key_up), 1); 82 break; 83 84 default: 85 break; 86 } 87 88 return (ret < 0) ? ret : -1; 89 } 90 91 static int gfrm_input_configured(struct hid_device *hid, struct hid_input *hidinput) 92 { 93 /* 94 * Enable software autorepeat with: 95 * - repeat delay: 400 msec 96 * - repeat period: 100 msec 97 */ 98 input_enable_softrepeat(hidinput->input, 400, 100); 99 return 0; 100 } 101 102 static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id) 103 { 104 int ret; 105 106 hid_set_drvdata(hdev, (void *) id->driver_data); 107 108 ret = hid_parse(hdev); 109 if (ret) 110 goto done; 111 112 if (id->driver_data == GFRM100) { 113 /* 114 * GFRM100 HID Report Descriptor does not describe the Search 115 * key reports. Thus, we need to add it manually here, so that 116 * those reports reach gfrm_raw_event() from hid_input_report(). 117 */ 118 if (!hid_register_report(hdev, HID_INPUT_REPORT, 119 GFRM100_SEARCH_KEY_REPORT_ID, 0)) { 120 ret = -ENOMEM; 121 goto done; 122 } 123 } 124 125 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 126 done: 127 return ret; 128 } 129 130 static void gfrm_remove(struct hid_device *hdev) 131 { 132 hid_hw_stop(hdev); 133 hid_set_drvdata(hdev, NULL); 134 } 135 136 static const struct hid_device_id gfrm_devices[] = { 137 { HID_BLUETOOTH_DEVICE(0x58, 0x2000), 138 .driver_data = GFRM100 }, 139 { HID_BLUETOOTH_DEVICE(0x471, 0x2210), 140 .driver_data = GFRM200 }, 141 { } 142 }; 143 MODULE_DEVICE_TABLE(hid, gfrm_devices); 144 145 static struct hid_driver gfrm_driver = { 146 .name = "gfrm", 147 .id_table = gfrm_devices, 148 .probe = gfrm_probe, 149 .remove = gfrm_remove, 150 .input_mapping = gfrm_input_mapping, 151 .raw_event = gfrm_raw_event, 152 .input_configured = gfrm_input_configured, 153 }; 154 155 module_hid_driver(gfrm_driver); 156 157 MODULE_AUTHOR("Petri Gynther <pgynther@google.com>"); 158 MODULE_DESCRIPTION("Google Fiber TV Box remote control driver"); 159 MODULE_LICENSE("GPL"); 160