[media] si2165: Add demod driver for DVB-T only

DVB-T was tested  with 8MHz BW channels in germany
This driver is the simplest possible, it uses automatic mode for all
parameters (TPS).

Added spectrum inversion support.

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Tested-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/dvb-frontends/Kconfig

@@ -63,6 +63,15 @@ config DVB_TDA18271C2DD
 
 	  Say Y when you want to support this tuner.
 
+config DVB_SI2165
+	tristate "Silicon Labs si2165 based"
+	depends on DVB_CORE && I2C
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  A DVB-C/T demodulator.
+
+	  Say Y when you want to support this frontend.
+
 comment "DVB-S (satellite) frontends"
 	depends on DVB_CORE
 

drivers/media/dvb-frontends/Makefile

@@ -105,6 +105,7 @@ obj-$(CONFIG_DVB_STV0367) += stv0367.o
 obj-$(CONFIG_DVB_CXD2820R) += cxd2820r.o
 obj-$(CONFIG_DVB_DRXK) += drxk.o
 obj-$(CONFIG_DVB_TDA18271C2DD) += tda18271c2dd.o
+obj-$(CONFIG_DVB_SI2165) += si2165.o
 obj-$(CONFIG_DVB_A8293) += a8293.o
 obj-$(CONFIG_DVB_TDA10071) += tda10071.o
 obj-$(CONFIG_DVB_RTL2830) += rtl2830.o

drivers/media/dvb-frontends/si2165.h

@@ -0,0 +1,64 @@
+/*
+    Driver for Silicon Labs SI2165 DVB-C/-T Demodulator
+
+    Copyright (C) 2013-2014 Matthias Schwarzott <zzam@gentoo.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    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.
+
+    References:
+    http://www.silabs.com/Support%20Documents/TechnicalDocs/Si2165-short.pdf
+*/
+
+#ifndef _DVB_SI2165_H
+#define _DVB_SI2165_H
+
+#include <linux/dvb/frontend.h>
+
+#if IS_ENABLED(CONFIG_DVB_SI2165)
+
+enum {
+	SI2165_MODE_OFF = 0x00,
+	SI2165_MODE_PLL_EXT = 0x20,
+	SI2165_MODE_PLL_XTAL = 0x21
+};
+
+struct si2165_config {
+	/* i2c addr
+	 * possible values: 0x64,0x65,0x66,0x67 */
+	u8 i2c_addr;
+
+	/* external clock or XTAL */
+	u8 chip_mode;
+
+	/* frequency of external clock or xtal in Hz
+	 * possible values: 4000000, 16000000, 20000000, 240000000, 27000000
+	 */
+	u32 ref_freq_Hz;
+
+	/* invert the spectrum */
+	bool inversion;
+};
+
+/* Addresses: 0x64,0x65,0x66,0x67 */
+struct dvb_frontend *si2165_attach(
+	const struct si2165_config *config,
+	struct i2c_adapter *i2c);
+#else
+static inline struct dvb_frontend *si2165_attach(
+	const struct si2165_config *config,
+	struct i2c_adapter *i2c)
+{
+	pr_warn("%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif /* CONFIG_DVB_SI2165 */
+
+#endif /* _DVB_SI2165_H */

drivers/media/dvb-frontends/si2165_priv.h

@@ -0,0 +1,23 @@
+/*
+    Driver for Silicon Labs SI2165 DVB-C/-T Demodulator
+
+    Copyright (C) 2013-2014 Matthias Schwarzott <zzam@gentoo.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    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 _DVB_SI2165_PRIV
+#define _DVB_SI2165_PRIV
+
+#define SI2165_FIRMWARE "dvb-demod-si2165.fw"
+
+#endif /* _DVB_SI2165_PRIV */