media: mxl692: MaxLinear 692 ATSC demod/tuner driver

MaxLinear 692 is a combo demod/tuner which has ATSC and QAM
capabilities. Only ATSC is currently advertised via DVB
properties. QAM still has issues.

Confirmed working on both big and little endian. Big
endian verified on PowerPC Mac mini.
Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/dvb-frontends/Kconfig

@@ -708,6 +708,15 @@ config DVB_S5H1411
 	  An ATSC 8VSB and QAM64/256 tuner module. Say Y when you want
 	  to support this frontend.
 
+config DVB_MXL692
+	tristate "MaxLinear MXL692 based"
+	depends on DVB_CORE && I2C
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  MaxLinear MxL692 is a combo tuner-demodulator that
+	  supports ATSC 8VSB and QAM modes. Say Y when you want to
+	  support this frontend.
+
 comment "ISDB-T (terrestrial) frontends"
 	depends on DVB_CORE
 

drivers/media/dvb-frontends/Makefile

@@ -55,6 +55,7 @@ obj-$(CONFIG_DVB_S5H1420) += s5h1420.o
 obj-$(CONFIG_DVB_LGDT330X) += lgdt330x.o
 obj-$(CONFIG_DVB_LGDT3305) += lgdt3305.o
 obj-$(CONFIG_DVB_LGDT3306A) += lgdt3306a.o
+obj-$(CONFIG_DVB_MXL692) += mxl692.o
 obj-$(CONFIG_DVB_LG2160) += lg2160.o
 obj-$(CONFIG_DVB_CX24123) += cx24123.o
 obj-$(CONFIG_DVB_LNBH25) += lnbh25.o

drivers/media/dvb-frontends/mxl692.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Driver for the MaxLinear MxL69x family of tuners/demods
+ *
+ * Copyright (C) 2020 Brad Love <brad@nextdimension.cc>
+ *
+ * based on code:
+ * Copyright (c) 2016 MaxLinear, Inc. All rights reserved
+ * which was released under GPL V2
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _MXL692_H_
+#define _MXL692_H_
+
+#include <media/dvb_frontend.h>
+
+#define MXL692_FIRMWARE "dvb-demod-mxl692.fw"
+
+struct mxl692_config {
+	unsigned char  id;
+	u8 i2c_addr;
+	/*
+	 * frontend
+	 * returned by driver
+	 */
+	struct dvb_frontend **fe;
+};
+
+#endif /* _MXL692_H_ */