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