// SPDX-License-Identifier: GPL-2.0
/*
 * cxd2880_devio_spi.c
 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
 * I/O interface via SPI
 *
 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
 */

#include "cxd2880_devio_spi.h"

#define BURST_WRITE_MAX 128

static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
                                   enum cxd2880_io_tgt tgt,
                                   u8 sub_address, u8 *data,
                                   u32 size)
{
        int ret = 0;
        struct cxd2880_spi *spi = NULL;
        u8 send_data[6];
        u8 *read_data_top = data;

        if (!io || !io->if_object || !data)
                return -EINVAL;

        if (sub_address + size > 0x100)
                return -EINVAL;

        spi = io->if_object;

        if (tgt == CXD2880_IO_TGT_SYS)
                send_data[0] = 0x0b;
        else
                send_data[0] = 0x0a;

        send_data[3] = 0;
        send_data[4] = 0;
        send_data[5] = 0;

        while (size > 0) {
                send_data[1] = sub_address;
                if (size > 255)
                        send_data[2] = 255;
                else
                        send_data[2] = size;

                ret =
                    spi->write_read(spi, send_data, sizeof(send_data),
                                    read_data_top, send_data[2]);
                if (ret)
                        return ret;

                sub_address += send_data[2];
                read_data_top += send_data[2];
                size -= send_data[2];
        }

        return ret;
}

static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
                                    enum cxd2880_io_tgt tgt,
                                    u8 sub_address,
                                    const u8 *data, u32 size)
{
        int ret = 0;
        struct cxd2880_spi *spi = NULL;
        u8 send_data[BURST_WRITE_MAX + 4];
        const u8 *write_data_top = data;

        if (!io || !io->if_object || !data)
                return -EINVAL;

        if (size > BURST_WRITE_MAX)
                return -EINVAL;

        if (sub_address + size > 0x100)
                return -EINVAL;

        spi = io->if_object;

        if (tgt == CXD2880_IO_TGT_SYS)
                send_data[0] = 0x0f;
        else
                send_data[0] = 0x0e;

        while (size > 0) {
                send_data[1] = sub_address;
                if (size > 255)
                        send_data[2] = 255;
                else
                        send_data[2] = size;

                memcpy(&send_data[3], write_data_top, send_data[2]);

                if (tgt == CXD2880_IO_TGT_SYS) {
                        send_data[3 + send_data[2]] = 0x00;
                        ret = spi->write(spi, send_data, send_data[2] + 4);
                } else {
                        ret = spi->write(spi, send_data, send_data[2] + 3);
                }
                if (ret)
                        return ret;

                sub_address += send_data[2];
                write_data_top += send_data[2];
                size -= send_data[2];
        }

        return ret;
}

int cxd2880_io_spi_create(struct cxd2880_io *io,
                          struct cxd2880_spi *spi, u8 slave_select)
{
        if (!io || !spi)
                return -EINVAL;

        io->read_regs = cxd2880_io_spi_read_reg;
        io->write_regs = cxd2880_io_spi_write_reg;
        io->write_reg = cxd2880_io_common_write_one_reg;
        io->if_object = spi;
        io->i2c_address_sys = 0;
        io->i2c_address_demod = 0;
        io->slave_select = slave_select;

        return 0;
}