media: cxd2880: Add common files for the driver

These are common files for the driver for the
Sony CXD2880 DVB-T2/T tuner + demodulator.
These contains helper functions for the driver.

Signed-off-by: Yasunari Takiguchi <Yasunari.Takiguchi@sony.com>
Signed-off-by: Masayuki Yamamoto <Masayuki.Yamamoto@sony.com>
Signed-off-by: Hideki Nozawa <Hideki.Nozawa@sony.com>
Signed-off-by: Kota Yonezawa <Kota.Yonezawa@sony.com>
Signed-off-by: Toshihiko Matsumoto <Toshihiko.Matsumoto@sony.com>
Signed-off-by: Satoshi Watanabe <Satoshi.C.Watanabe@sony.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/cxd2880/cxd2880.h

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * cxd2880.h
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver public definitions
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#ifndef CXD2880_H
+#define CXD2880_H
+
+struct cxd2880_config {
+	struct spi_device *spi;
+	struct mutex *spi_mutex; /* For SPI access exclusive control */
+};
+
+#if IS_REACHABLE(CONFIG_DVB_CXD2880)
+extern struct dvb_frontend *cxd2880_attach(struct dvb_frontend *fe,
+					struct cxd2880_config *cfg);
+#else
+static inline struct dvb_frontend *cxd2880_attach(struct dvb_frontend *fe,
+					struct cxd2880_config *cfg)
+{
+	pr_warn("%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif /* CONFIG_DVB_CXD2880 */
+
+#endif /* CXD2880_H */

drivers/media/dvb-frontends/cxd2880/cxd2880_common.c

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cxd2880_common.c
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver
+ * common functions
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#include "cxd2880_common.h"
+
+int cxd2880_convert2s_complement(u32 value, u32 bitlen)
+{
+	if (!bitlen || bitlen >= 32)
+		return (int)value;
+
+	if (value & (u32)(1 << (bitlen - 1)))
+		return (int)(GENMASK(31, bitlen) | value);
+	else
+		return (int)(GENMASK(bitlen - 1, 0) & value);
+}

drivers/media/dvb-frontends/cxd2880/cxd2880_common.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * cxd2880_common.h
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver common definitions
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#ifndef CXD2880_COMMON_H
+#define CXD2880_COMMON_H
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+
+int cxd2880_convert2s_complement(u32 value, u32 bitlen);
+
+#endif

drivers/media/dvb-frontends/cxd2880/cxd2880_io.c

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cxd2880_io.c
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver
+ * register I/O interface functions
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#include "cxd2880_io.h"
+
+int cxd2880_io_common_write_one_reg(struct cxd2880_io *io,
+				    enum cxd2880_io_tgt tgt,
+				    u8 sub_address, u8 data)
+{
+	if (!io)
+		return -EINVAL;
+
+	return io->write_regs(io, tgt, sub_address, &data, 1);
+}
+
+int cxd2880_io_set_reg_bits(struct cxd2880_io *io,
+			    enum cxd2880_io_tgt tgt,
+			    u8 sub_address, u8 data, u8 mask)
+{
+	int ret;
+
+	if (!io)
+		return -EINVAL;
+
+	if (mask == 0x00)
+		return 0;
+
+	if (mask != 0xff) {
+		u8 rdata = 0x00;
+
+		ret = io->read_regs(io, tgt, sub_address, &rdata, 1);
+		if (ret)
+			return ret;
+
+		data = (data & mask) | (rdata & (mask ^ 0xff));
+	}
+
+	return io->write_reg(io, tgt, sub_address, data);
+}
+
+int cxd2880_io_write_multi_regs(struct cxd2880_io *io,
+			     enum cxd2880_io_tgt tgt,
+			     const struct cxd2880_reg_value reg_value[],
+			     u8 size)
+{
+	int ret;
+	int i;
+
+	if (!io)
+		return -EINVAL;
+
+	for (i = 0; i < size ; i++) {
+		ret = io->write_reg(io, tgt, reg_value[i].addr,
+				    reg_value[i].value);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}

drivers/media/dvb-frontends/cxd2880/cxd2880_io.h

@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * cxd2880_io.h
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver
+ * register I/O interface definitions
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#ifndef CXD2880_IO_H
+#define CXD2880_IO_H
+
+#include "cxd2880_common.h"
+
+enum cxd2880_io_tgt {
+	CXD2880_IO_TGT_SYS,
+	CXD2880_IO_TGT_DMD
+};
+
+struct cxd2880_reg_value {
+	u8 addr;
+	u8 value;
+};
+
+struct cxd2880_io {
+	int (*read_regs)(struct cxd2880_io *io,
+			 enum cxd2880_io_tgt tgt, u8 sub_address,
+			 u8 *data, u32 size);
+	int (*write_regs)(struct cxd2880_io *io,
+			  enum cxd2880_io_tgt tgt, u8 sub_address,
+			  const u8 *data, u32 size);
+	int (*write_reg)(struct cxd2880_io *io,
+			 enum cxd2880_io_tgt tgt, u8 sub_address,
+			 u8 data);
+	void *if_object;
+	u8 i2c_address_sys;
+	u8 i2c_address_demod;
+	u8 slave_select;
+	void *user;
+};
+
+int cxd2880_io_common_write_one_reg(struct cxd2880_io *io,
+				    enum cxd2880_io_tgt tgt,
+				    u8 sub_address, u8 data);
+
+int cxd2880_io_set_reg_bits(struct cxd2880_io *io,
+			    enum cxd2880_io_tgt tgt,
+			    u8 sub_address, u8 data, u8 mask);
+
+int cxd2880_io_write_multi_regs(struct cxd2880_io *io,
+				enum cxd2880_io_tgt tgt,
+				const struct cxd2880_reg_value reg_value[],
+				u8 size);
+#endif