1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_devio_spi.c b/drivers/media/dvb-frontends/cxd2880/cxd2880_devio_spi.c
new file mode 100644
index 000000000000..aba59400859e
--- /dev/null
+++ b/drivers/media/dvb-frontends/cxd2880/cxd2880_devio_spi.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cxd2880_devio_spi.c
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver
+ * I/O interface via SPI
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#include "cxd2880_devio_spi.h"
+
+#define BURST_WRITE_MAX 128
+
+static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
+				   enum cxd2880_io_tgt tgt,
+				   u8 sub_address, u8 *data,
+				   u32 size)
+{
+	int ret = 0;
+	struct cxd2880_spi *spi = NULL;
+	u8 send_data[6];
+	u8 *read_data_top = data;
+
+	if (!io || !io->if_object || !data)
+		return -EINVAL;
+
+	if (sub_address + size > 0x100)
+		return -EINVAL;
+
+	spi = io->if_object;
+
+	if (tgt == CXD2880_IO_TGT_SYS)
+		send_data[0] = 0x0b;
+	else
+		send_data[0] = 0x0a;
+
+	send_data[3] = 0;
+	send_data[4] = 0;
+	send_data[5] = 0;
+
+	while (size > 0) {
+		send_data[1] = sub_address;
+		if (size > 255)
+			send_data[2] = 255;
+		else
+			send_data[2] = size;
+
+		ret =
+		    spi->write_read(spi, send_data, sizeof(send_data),
+				    read_data_top, send_data[2]);
+		if (ret)
+			return ret;
+
+		sub_address += send_data[2];
+		read_data_top += send_data[2];
+		size -= send_data[2];
+	}
+
+	return ret;
+}
+
+static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
+				    enum cxd2880_io_tgt tgt,
+				    u8 sub_address,
+				    const u8 *data, u32 size)
+{
+	int ret = 0;
+	struct cxd2880_spi *spi = NULL;
+	u8 send_data[BURST_WRITE_MAX + 4];
+	const u8 *write_data_top = data;
+
+	if (!io || !io->if_object || !data)
+		return -EINVAL;
+
+	if (size > BURST_WRITE_MAX)
+		return -EINVAL;
+
+	if (sub_address + size > 0x100)
+		return -EINVAL;
+
+	spi = io->if_object;
+
+	if (tgt == CXD2880_IO_TGT_SYS)
+		send_data[0] = 0x0f;
+	else
+		send_data[0] = 0x0e;
+
+	while (size > 0) {
+		send_data[1] = sub_address;
+		if (size > 255)
+			send_data[2] = 255;
+		else
+			send_data[2] = size;
+
+		memcpy(&send_data[3], write_data_top, send_data[2]);
+
+		if (tgt == CXD2880_IO_TGT_SYS) {
+			send_data[3 + send_data[2]] = 0x00;
+			ret = spi->write(spi, send_data, send_data[2] + 4);
+		} else {
+			ret = spi->write(spi, send_data, send_data[2] + 3);
+		}
+		if (ret)
+			return ret;
+
+		sub_address += send_data[2];
+		write_data_top += send_data[2];
+		size -= send_data[2];
+	}
+
+	return ret;
+}
+
+int cxd2880_io_spi_create(struct cxd2880_io *io,
+			  struct cxd2880_spi *spi, u8 slave_select)
+{
+	if (!io || !spi)
+		return -EINVAL;
+
+	io->read_regs = cxd2880_io_spi_read_reg;
+	io->write_regs = cxd2880_io_spi_write_reg;
+	io->write_reg = cxd2880_io_common_write_one_reg;
+	io->if_object = spi;
+	io->i2c_address_sys = 0;
+	io->i2c_address_demod = 0;
+	io->slave_select = slave_select;
+
+	return 0;
+}