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