From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- .../dvb-frontends/cxd2880/cxd2880_spi_device.c | 113 +++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c (limited to 'drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c') diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c new file mode 100644 index 000000000..b8cbaa8d7 --- /dev/null +++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c @@ -0,0 +1,113 @@ +// 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 + +#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; +} -- cgit v1.2.3