// SPDX-License-Identifier: GPL-2.0
// cx231xx IR glue driver
//
// Copyright (c) 2010 Mauro Carvalho Chehab <mchehab@kernel.org>
//
// Polaris (cx231xx) has its support for IR's with a design close to MCE.
// however, a few designs are using an external I2C chip for IR, instead
// of using the one provided by the chip.
// This driver provides support for those extra devices

#include "cx231xx.h"
#include <linux/slab.h>
#include <linux/bitrev.h>

#define MODULE_NAME "cx231xx-input"

static int get_key_isdbt(struct IR_i2c *ir, enum rc_proto *protocol,
                         u32 *pscancode, u8 *toggle)
{
        int     rc;
        u8      cmd, scancode;

        dev_dbg(&ir->rc->dev, "%s\n", __func__);

                /* poll IR chip */
        rc = i2c_master_recv(ir->c, &cmd, 1);
        if (rc < 0)
                return rc;
        if (rc != 1)
                return -EIO;

        /* it seems that 0xFE indicates that a button is still hold
           down, while 0xff indicates that no button is hold
           down. 0xfe sequences are sometimes interrupted by 0xFF */

        if (cmd == 0xff)
                return 0;

        scancode = bitrev8(cmd);

        dev_dbg(&ir->rc->dev, "cmd %02x, scan = %02x\n", cmd, scancode);

        *protocol = RC_PROTO_OTHER;
        *pscancode = scancode;
        *toggle = 0;
        return 1;
}

int cx231xx_ir_init(struct cx231xx *dev)
{
        struct i2c_board_info info;
        u8 ir_i2c_bus;

        dev_dbg(dev->dev, "%s\n", __func__);

        /* Only initialize if a rc keycode map is defined */
        if (!cx231xx_boards[dev->model].rc_map_name)
                return -ENODEV;

        request_module("ir-kbd-i2c");

        memset(&info, 0, sizeof(struct i2c_board_info));
        memset(&dev->init_data, 0, sizeof(dev->init_data));
        dev->init_data.rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
        if (!dev->init_data.rc_dev)
                return -ENOMEM;

        dev->init_data.name = cx231xx_boards[dev->model].name;

        strscpy(info.type, "ir_video", I2C_NAME_SIZE);
        info.platform_data = &dev->init_data;

        /*
         * Board-dependent values
         *
         * For now, there's just one type of hardware design using
         * an i2c device.
         */
        dev->init_data.get_key = get_key_isdbt;
        dev->init_data.ir_codes = cx231xx_boards[dev->model].rc_map_name;
        /* The i2c micro-controller only outputs the cmd part of NEC protocol */
        dev->init_data.rc_dev->scancode_mask = 0xff;
        dev->init_data.rc_dev->driver_name = "cx231xx";
        dev->init_data.type = RC_PROTO_BIT_NEC;
        info.addr = 0x30;

        /* Load and bind ir-kbd-i2c */
        ir_i2c_bus = cx231xx_boards[dev->model].ir_i2c_master;
        dev_dbg(dev->dev, "Trying to bind ir at bus %d, addr 0x%02x\n",
                ir_i2c_bus, info.addr);
        dev->ir_i2c_client = i2c_new_client_device(
                cx231xx_get_i2c_adap(dev, ir_i2c_bus), &info);

        return 0;
}

void cx231xx_ir_exit(struct cx231xx *dev)
{
        i2c_unregister_device(dev->ir_i2c_client);
        dev->ir_i2c_client = NULL;
}