4e67e6cb06
Add functions for initializing, reading and writing to the SPI device for the Sony CXD2880 DVB-T2/T tuner + demodulator. Signed-off-by: Yasunari Takiguchi <Yasunari.Takiguchi@sony.com> Signed-off-by: Masayuki Yamamoto <Masayuki.Yamamoto@sony.com> Signed-off-by: Hideki Nozawa <Hideki.Nozawa@sony.com> Signed-off-by: Kota Yonezawa <Kota.Yonezawa@sony.com> Signed-off-by: Toshihiko Matsumoto <Toshihiko.Matsumoto@sony.com> Signed-off-by: Satoshi Watanabe <Satoshi.C.Watanabe@sony.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
// 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;
|
|
}
|