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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c')
-rw-r--r--drivers/media/dvb-frontends/cxd2880/cxd2880_spi_device.c113
1 files changed, 113 insertions, 0 deletions
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 <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;
+}