// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HID driver for some chicony "special" devices
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 *  Copyright (c) 2007 Paul Walmsley
 *  Copyright (c) 2008 Jiri Slaby
 */

/*
 */

#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "hid-ids.h"

#define CH_WIRELESS_CTL_REPORT_ID       0x11

static int ch_report_wireless(struct hid_report *report, u8 *data, int size)
{
        struct hid_device *hdev = report->device;
        struct input_dev *input;

        if (report->id != CH_WIRELESS_CTL_REPORT_ID || report->maxfield != 1)
                return 0;

        input = report->field[0]->hidinput->input;
        if (!input) {
                hid_warn(hdev, "can't find wireless radio control's input");
                return 0;
        }

        input_report_key(input, KEY_RFKILL, 1);
        input_sync(input);
        input_report_key(input, KEY_RFKILL, 0);
        input_sync(input);

        return 1;
}

static int ch_raw_event(struct hid_device *hdev,
                struct hid_report *report, u8 *data, int size)
{
        if (report->application == HID_GD_WIRELESS_RADIO_CTLS)
                return ch_report_wireless(report, data, size);

        return 0;
}

#define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
                                        EV_KEY, (c))
static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
                struct hid_field *field, struct hid_usage *usage,
                unsigned long **bit, int *max)
{
        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
                return 0;

        set_bit(EV_REP, hi->input->evbit);
        switch (usage->hid & HID_USAGE) {
        case 0xff01: ch_map_key_clear(BTN_1);   break;
        case 0xff02: ch_map_key_clear(BTN_2);   break;
        case 0xff03: ch_map_key_clear(BTN_3);   break;
        case 0xff04: ch_map_key_clear(BTN_4);   break;
        case 0xff05: ch_map_key_clear(BTN_5);   break;
        case 0xff06: ch_map_key_clear(BTN_6);   break;
        case 0xff07: ch_map_key_clear(BTN_7);   break;
        case 0xff08: ch_map_key_clear(BTN_8);   break;
        case 0xff09: ch_map_key_clear(BTN_9);   break;
        case 0xff0a: ch_map_key_clear(BTN_A);   break;
        case 0xff0b: ch_map_key_clear(BTN_B);   break;
        case 0x00f1: ch_map_key_clear(KEY_WLAN);        break;
        case 0x00f2: ch_map_key_clear(KEY_BRIGHTNESSDOWN);      break;
        case 0x00f3: ch_map_key_clear(KEY_BRIGHTNESSUP);        break;
        case 0x00f4: ch_map_key_clear(KEY_DISPLAY_OFF); break;
        case 0x00f7: ch_map_key_clear(KEY_CAMERA);      break;
        case 0x00f8: ch_map_key_clear(KEY_PROG1);       break;
        default:
                return 0;
        }
        return 1;
}

static const __u8 *ch_switch12_report_fixup(struct hid_device *hdev,
                __u8 *rdesc, unsigned int *rsize)
{
        struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
        
        if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
                /* Change usage maximum and logical maximum from 0x7fff to
                 * 0x2fff, so they don't exceed HID_MAX_USAGES */
                switch (hdev->product) {
                case USB_DEVICE_ID_CHICONY_ACER_SWITCH12:
                        if (*rsize >= 128 && rdesc[64] == 0xff && rdesc[65] == 0x7f
                                        && rdesc[69] == 0xff && rdesc[70] == 0x7f) {
                                hid_info(hdev, "Fixing up report descriptor\n");
                                rdesc[65] = rdesc[70] = 0x2f;
                        }
                        break;
                }

        }
        return rdesc;
}

static int ch_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
        int ret;

        if (!hid_is_usb(hdev))
                return -EINVAL;

        hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
        ret = hid_parse(hdev);
        if (ret) {
                hid_err(hdev, "Chicony hid parse failed: %d\n", ret);
                return ret;
        }

        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
        if (ret) {
                hid_err(hdev, "Chicony hw start failed: %d\n", ret);
                return ret;
        }

        return 0;
}

static const struct hid_device_id ch_devices[] = {
        { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
        { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
        { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS3) },
        { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
        { }
};
MODULE_DEVICE_TABLE(hid, ch_devices);

static struct hid_driver ch_driver = {
        .name = "chicony",
        .id_table = ch_devices,
        .report_fixup = ch_switch12_report_fixup,
        .input_mapping = ch_input_mapping,
        .probe = ch_probe,
        .raw_event = ch_raw_event,
};
module_hid_driver(ch_driver);

MODULE_DESCRIPTION("HID driver for some chicony \"special\" devices");
MODULE_LICENSE("GPL");