// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * FireDTV driver (formerly known as FireSAT)
 *
 * Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
 */

#include <linux/bitops.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/workqueue.h>

#include "firedtv.h"

/* fixed table with older keycodes, geared towards MythTV */
static const u16 oldtable[] = {

        /* code from device: 0x4501...0x451f */

        KEY_ESC,
        KEY_F9,
        KEY_1,
        KEY_2,
        KEY_3,
        KEY_4,
        KEY_5,
        KEY_6,
        KEY_7,
        KEY_8,
        KEY_9,
        KEY_I,
        KEY_0,
        KEY_ENTER,
        KEY_RED,
        KEY_UP,
        KEY_GREEN,
        KEY_F10,
        KEY_SPACE,
        KEY_F11,
        KEY_YELLOW,
        KEY_DOWN,
        KEY_BLUE,
        KEY_Z,
        KEY_P,
        KEY_PAGEDOWN,
        KEY_LEFT,
        KEY_W,
        KEY_RIGHT,
        KEY_P,
        KEY_M,

        /* code from device: 0x4540...0x4542 */

        KEY_R,
        KEY_V,
        KEY_C,
};

/* user-modifiable table for a remote as sold in 2008 */
static const u16 keytable[] = {

        /* code from device: 0x0300...0x031f */

        [0x00] = KEY_POWER,
        [0x01] = KEY_SLEEP,
        [0x02] = KEY_STOP,
        [0x03] = KEY_OK,
        [0x04] = KEY_RIGHT,
        [0x05] = KEY_1,
        [0x06] = KEY_2,
        [0x07] = KEY_3,
        [0x08] = KEY_LEFT,
        [0x09] = KEY_4,
        [0x0a] = KEY_5,
        [0x0b] = KEY_6,
        [0x0c] = KEY_UP,
        [0x0d] = KEY_7,
        [0x0e] = KEY_8,
        [0x0f] = KEY_9,
        [0x10] = KEY_DOWN,
        [0x11] = KEY_TITLE,     /* "OSD" - fixme */
        [0x12] = KEY_0,
        [0x13] = KEY_F20,       /* "16:9" - fixme */
        [0x14] = KEY_SCREEN,    /* "FULL" - fixme */
        [0x15] = KEY_MUTE,
        [0x16] = KEY_SUBTITLE,
        [0x17] = KEY_RECORD,
        [0x18] = KEY_TEXT,
        [0x19] = KEY_AUDIO,
        [0x1a] = KEY_RED,
        [0x1b] = KEY_PREVIOUS,
        [0x1c] = KEY_REWIND,
        [0x1d] = KEY_PLAYPAUSE,
        [0x1e] = KEY_NEXT,
        [0x1f] = KEY_VOLUMEUP,

        /* code from device: 0x0340...0x0354 */

        [0x20] = KEY_CHANNELUP,
        [0x21] = KEY_F21,       /* "4:3" - fixme */
        [0x22] = KEY_TV,
        [0x23] = KEY_DVD,
        [0x24] = KEY_VCR,
        [0x25] = KEY_AUX,
        [0x26] = KEY_GREEN,
        [0x27] = KEY_YELLOW,
        [0x28] = KEY_BLUE,
        [0x29] = KEY_CHANNEL,   /* "CH.LIST" */
        [0x2a] = KEY_VENDOR,    /* "CI" - fixme */
        [0x2b] = KEY_VOLUMEDOWN,
        [0x2c] = KEY_CHANNELDOWN,
        [0x2d] = KEY_LAST,
        [0x2e] = KEY_INFO,
        [0x2f] = KEY_FORWARD,
        [0x30] = KEY_LIST,
        [0x31] = KEY_FAVORITES,
        [0x32] = KEY_MENU,
        [0x33] = KEY_EPG,
        [0x34] = KEY_EXIT,
};

int fdtv_register_rc(struct firedtv *fdtv, struct device *dev)
{
        struct input_dev *idev;
        int i, err;

        idev = input_allocate_device();
        if (!idev)
                return -ENOMEM;

        fdtv->remote_ctrl_dev = idev;
        idev->name = "FireDTV remote control";
        idev->dev.parent = dev;
        idev->evbit[0] = BIT_MASK(EV_KEY);
        idev->keycode = kmemdup(keytable, sizeof(keytable), GFP_KERNEL);
        if (!idev->keycode) {
                err = -ENOMEM;
                goto fail;
        }
        idev->keycodesize = sizeof(keytable[0]);
        idev->keycodemax = ARRAY_SIZE(keytable);

        for (i = 0; i < ARRAY_SIZE(keytable); i++)
                set_bit(keytable[i], idev->keybit);

        err = input_register_device(idev);
        if (err)
                goto fail_free_keymap;

        return 0;

fail_free_keymap:
        kfree(idev->keycode);
fail:
        input_free_device(idev);
        return err;
}

void fdtv_unregister_rc(struct firedtv *fdtv)
{
        cancel_work_sync(&fdtv->remote_ctrl_work);
        kfree(fdtv->remote_ctrl_dev->keycode);
        input_unregister_device(fdtv->remote_ctrl_dev);
}

void fdtv_handle_rc(struct firedtv *fdtv, unsigned int code)
{
        struct input_dev *idev = fdtv->remote_ctrl_dev;
        u16 *keycode = idev->keycode;

        if (code >= 0x0300 && code <= 0x031f)
                code = keycode[code - 0x0300];
        else if (code >= 0x0340 && code <= 0x0354)
                code = keycode[code - 0x0320];
        else if (code >= 0x4501 && code <= 0x451f)
                code = oldtable[code - 0x4501];
        else if (code >= 0x4540 && code <= 0x4542)
                code = oldtable[code - 0x4521];
        else {
                dev_dbg(fdtv->device,
                        "invalid key code 0x%04x from remote control\n",
                        code);
                return;
        }

        input_report_key(idev, code, 1);
        input_sync(idev);
        input_report_key(idev, code, 0);
        input_sync(idev);
}