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 000000000000..b8cbaa8d7aff
--- /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;
+}