// SPDX-License-Identifier: GPL-2.0
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/*
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* cxd2880_devio_spi.c
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* Sony CXD2880 DVB-T2/T tuner + demodulator driver
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* I/O interface via SPI
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*
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* Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
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*/
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#include "cxd2880_devio_spi.h"
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#define BURST_WRITE_MAX 128
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static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
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enum cxd2880_io_tgt tgt,
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u8 sub_address, u8 *data,
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u32 size)
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{
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int ret = 0;
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struct cxd2880_spi *spi = NULL;
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u8 send_data[6];
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u8 *read_data_top = data;
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if (!io || !io->if_object || !data)
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return -EINVAL;
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if (sub_address + size > 0x100)
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return -EINVAL;
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spi = io->if_object;
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if (tgt == CXD2880_IO_TGT_SYS)
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send_data[0] = 0x0b;
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else
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send_data[0] = 0x0a;
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send_data[3] = 0;
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send_data[4] = 0;
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send_data[5] = 0;
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while (size > 0) {
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send_data[1] = sub_address;
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if (size > 255)
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send_data[2] = 255;
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else
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send_data[2] = size;
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ret =
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spi->write_read(spi, send_data, sizeof(send_data),
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read_data_top, send_data[2]);
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if (ret)
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return ret;
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sub_address += send_data[2];
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read_data_top += send_data[2];
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size -= send_data[2];
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}
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return ret;
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}
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static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
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enum cxd2880_io_tgt tgt,
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u8 sub_address,
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const u8 *data, u32 size)
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{
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int ret = 0;
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struct cxd2880_spi *spi = NULL;
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u8 send_data[BURST_WRITE_MAX + 4];
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const u8 *write_data_top = data;
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if (!io || !io->if_object || !data)
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return -EINVAL;
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if (size > BURST_WRITE_MAX)
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return -EINVAL;
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if (sub_address + size > 0x100)
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return -EINVAL;
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spi = io->if_object;
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if (tgt == CXD2880_IO_TGT_SYS)
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send_data[0] = 0x0f;
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else
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send_data[0] = 0x0e;
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while (size > 0) {
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send_data[1] = sub_address;
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if (size > 255)
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send_data[2] = 255;
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else
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send_data[2] = size;
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memcpy(&send_data[3], write_data_top, send_data[2]);
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if (tgt == CXD2880_IO_TGT_SYS) {
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send_data[3 + send_data[2]] = 0x00;
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ret = spi->write(spi, send_data, send_data[2] + 4);
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} else {
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ret = spi->write(spi, send_data, send_data[2] + 3);
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}
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if (ret)
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return ret;
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sub_address += send_data[2];
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write_data_top += send_data[2];
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size -= send_data[2];
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}
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return ret;
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}
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int cxd2880_io_spi_create(struct cxd2880_io *io,
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struct cxd2880_spi *spi, u8 slave_select)
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{
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if (!io || !spi)
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return -EINVAL;
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io->read_regs = cxd2880_io_spi_read_reg;
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io->write_regs = cxd2880_io_spi_write_reg;
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io->write_reg = cxd2880_io_common_write_one_reg;
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io->if_object = spi;
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io->i2c_address_sys = 0;
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io->i2c_address_demod = 0;
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io->slave_select = slave_select;
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return 0;
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}
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