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// SPDX-License-Identifier: GPL-2.0
/*
* cxd2880_spi_device.c
* Sony CXD2880 DVB-T2/T tuner + demodulator driver
* SPI access functions
*
* Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
*/
#include <linux/spi/spi.h>
#include "cxd2880_spi_device.h"
static int cxd2880_spi_device_write(struct cxd2880_spi *spi,
const u8 *data, u32 size)
{
struct cxd2880_spi_device *spi_device = NULL;
struct spi_message msg;
struct spi_transfer tx;
int result = 0;
if (!spi || !spi->user || !data || size == 0)
return -EINVAL;
spi_device = spi->user;
memset(&tx, 0, sizeof(tx));
tx.tx_buf = data;
tx.len = size;
spi_message_init(&msg);
spi_message_add_tail(&tx, &msg);
result = spi_sync(spi_device->spi, &msg);
if (result < 0)
return -EIO;
return 0;
}
static int cxd2880_spi_device_write_read(struct cxd2880_spi *spi,
const u8 *tx_data,
u32 tx_size,
u8 *rx_data,
u32 rx_size)
{
struct cxd2880_spi_device *spi_device = NULL;
int result = 0;
if (!spi || !spi->user || !tx_data ||
!tx_size || !rx_data || !rx_size)
return -EINVAL;
spi_device = spi->user;
result = spi_write_then_read(spi_device->spi, tx_data,
tx_size, rx_data, rx_size);
if (result < 0)
return -EIO;
return 0;
}
int
cxd2880_spi_device_initialize(struct cxd2880_spi_device *spi_device,
enum cxd2880_spi_mode mode,
u32 speed_hz)
{
int result = 0;
struct spi_device *spi = spi_device->spi;
switch (mode) {
case CXD2880_SPI_MODE_0:
spi->mode = SPI_MODE_0;
break;
case CXD2880_SPI_MODE_1:
spi->mode = SPI_MODE_1;
break;
case CXD2880_SPI_MODE_2:
spi->mode = SPI_MODE_2;
break;
case CXD2880_SPI_MODE_3:
spi->mode = SPI_MODE_3;
break;
default:
return -EINVAL;
}
spi->max_speed_hz = speed_hz;
spi->bits_per_word = 8;
result = spi_setup(spi);
if (result != 0) {
pr_err("spi_setup failed %d\n", result);
return -EINVAL;
}
return 0;
}
int cxd2880_spi_device_create_spi(struct cxd2880_spi *spi,
struct cxd2880_spi_device *spi_device)
{
if (!spi || !spi_device)
return -EINVAL;
spi->read = NULL;
spi->write = cxd2880_spi_device_write;
spi->write_read = cxd2880_spi_device_write_read;
spi->flags = 0;
spi->user = spi_device;
return 0;
}
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