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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