// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * HID driver for Google Fiber TV Box remote controls
 *
 * Copyright (c) 2014-2015 Google Inc.
 *
 * Author: Petri Gynther <pgynther@google.com>
 */
#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 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,
        .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");