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Subject: media: cxd2880: Add common files for the driver
Author:  Yasunari Takiguchi <yasunari.takigu...@sony.com>
Date:    Thu Jan 18 03:47:38 2018 -0500

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.takigu...@sony.com>
Signed-off-by: Masayuki Yamamoto <masayuki.yamam...@sony.com>
Signed-off-by: Hideki Nozawa <hideki.noz...@sony.com>
Signed-off-by: Kota Yonezawa <kota.yonez...@sony.com>
Signed-off-by: Toshihiko Matsumoto <toshihiko.matsum...@sony.com>
Signed-off-by: Satoshi Watanabe <satoshi.c.watan...@sony.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/dvb-frontends/cxd2880/cxd2880.h      | 29 ++++++++++
 .../media/dvb-frontends/cxd2880/cxd2880_common.c   | 21 +++++++
 .../media/dvb-frontends/cxd2880/cxd2880_common.h   | 19 +++++++
 drivers/media/dvb-frontends/cxd2880/cxd2880_io.c   | 66 ++++++++++++++++++++++
 drivers/media/dvb-frontends/cxd2880/cxd2880_io.h   | 54 ++++++++++++++++++
 5 files changed, 189 insertions(+)

---

diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880.h 
b/drivers/media/dvb-frontends/cxd2880/cxd2880.h
new file mode 100644
index 000000000000..4ea3510aab66
--- /dev/null
+++ b/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 */
diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_common.c 
b/drivers/media/dvb-frontends/cxd2880/cxd2880_common.c
new file mode 100644
index 000000000000..d6f5af6609c1
--- /dev/null
+++ b/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);
+}
diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_common.h 
b/drivers/media/dvb-frontends/cxd2880/cxd2880_common.h
new file mode 100644
index 000000000000..b05bce71ab35
--- /dev/null
+++ b/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
diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_io.c 
b/drivers/media/dvb-frontends/cxd2880/cxd2880_io.c
new file mode 100644
index 000000000000..9d932bccfa6c
--- /dev/null
+++ b/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;
+}
diff --git a/drivers/media/dvb-frontends/cxd2880/cxd2880_io.h 
b/drivers/media/dvb-frontends/cxd2880/cxd2880_io.h
new file mode 100644
index 000000000000..ba550278881d
--- /dev/null
+++ b/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

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