/* * HID driver for Google Fiber TV Box remote controls * * Copyright (c) 2014-2015 Google Inc. * * Author: Petri Gynther <pgynther@google.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. */ #include <linux/device.h> #include <linux/hid.h> #include <linux/input.h> #include <linux/module.h> #include "hid-ids.h" #define GFRM100 1 /* Google Fiber GFRM100 (Bluetooth classic) */ #define GFRM200 2 /* Google Fiber GFRM200 (Bluetooth LE) */ #define GFRM100_SEARCH_KEY_REPORT_ID 0xF7 #define GFRM100_SEARCH_KEY_DOWN 0x0 #define GFRM100_SEARCH_KEY_AUDIO_DATA 0x1 #define GFRM100_SEARCH_KEY_UP 0x2 static u8 search_key_dn[3] = {0x40, 0x21, 0x02}; static u8 search_key_up[3] = {0x40, 0x00, 0x00}; static int gfrm_input_mapping(struct hid_device *hdev, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max) { unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev); if (hdev_type == GFRM100) { if (usage->hid == (HID_UP_CONSUMER | 0x4)) { /* Consumer.0004 -> KEY_INFO */ hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_INFO); return 1; } if (usage->hid == (HID_UP_CONSUMER | 0x41)) { /* Consumer.0041 -> KEY_OK */ hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_OK); return 1; } } return 0; } static int gfrm_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data, int size) { unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev); int ret = 0; if (hdev_type != GFRM100) return 0; if (size < 2 || data[0] != GFRM100_SEARCH_KEY_REPORT_ID) return 0; /* * Convert GFRM100 Search key reports into Consumer.0221 (Key.Search) * reports. Ignore audio data. */ switch (data[1]) { case GFRM100_SEARCH_KEY_DOWN: ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_dn, sizeof(search_key_dn), 1); break; case GFRM100_SEARCH_KEY_AUDIO_DATA: break; case GFRM100_SEARCH_KEY_UP: ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_up, sizeof(search_key_up), 1); break; default: break; } return (ret < 0) ? ret : -1; } static int gfrm_input_configured(struct hid_device *hid, struct hid_input *hidinput) { /* * Enable software autorepeat with: * - repeat delay: 400 msec * - repeat period: 100 msec */ input_enable_softrepeat(hidinput->input, 400, 100); return 0; } static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret; hid_set_drvdata(hdev, (void *) id->driver_data); ret = hid_parse(hdev); if (ret) goto done; if (id->driver_data == GFRM100) { /* * GFRM100 HID Report Descriptor does not describe the Search * key reports. Thus, we need to add it manually here, so that * those reports reach gfrm_raw_event() from hid_input_report(). */ if (!hid_register_report(hdev, HID_INPUT_REPORT, GFRM100_SEARCH_KEY_REPORT_ID, 0)) { ret = -ENOMEM; goto done; } } ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); done: return ret; } static void gfrm_remove(struct hid_device *hdev) { hid_hw_stop(hdev); hid_set_drvdata(hdev, NULL); } static const struct hid_device_id gfrm_devices[] = { { HID_BLUETOOTH_DEVICE(0x58, 0x2000), .driver_data = GFRM100 }, { HID_BLUETOOTH_DEVICE(0x471, 0x2210), .driver_data = GFRM200 }, { } }; MODULE_DEVICE_TABLE(hid, gfrm_devices); static struct hid_driver gfrm_driver = { .name = "gfrm", .id_table = gfrm_devices, .probe = gfrm_probe, .remove = gfrm_remove, .input_mapping = gfrm_input_mapping, .raw_event = gfrm_raw_event, .input_configured = gfrm_input_configured, }; module_hid_driver(gfrm_driver); MODULE_AUTHOR("Petri Gynther <pgynther@google.com>"); MODULE_DESCRIPTION("Google Fiber TV Box remote control driver"); MODULE_LICENSE("GPL");