[media] tc90522: add driver for Toshiba TC90522 quad demodulator

This patch adds driver for tc90522 demodulator chips.
The chip contains 4 demod modules that run in parallel and are independently
controllable via separate I2C addresses.
Two of the modules are for ISDB-T and the rest for ISDB-S.
It is used in earthsoft pt3 cards.

Note that this driver does not init the chip,
because the initilization sequence / register setting is not disclosed.
Thus, the driver assumes that the chips are initilized externally
by its parent board driver before fe->ops->init() are called.
Earthsoft PT3 PCIe card, for example, contains the init sequence
in its private memory and provides a command to trigger the sequence.

Signed-off-by: Akihiro Tsukada <tskd08@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/Kconfig

@@ -648,6 +648,14 @@ config DVB_MB86A20S
 	  A driver for Fujitsu mb86a20s ISDB-T/ISDB-Tsb demodulator.
 	  Say Y when you want to support this frontend.
 
+config DVB_TC90522
+	tristate "Toshiba TC90522"
+	depends on DVB_CORE && I2C
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  A Toshiba TC90522 2xISDB-T + 2xISDB-S demodulator.
+	  Say Y when you want to support this frontend.
+
 comment "Digital terrestrial only tuners/PLL"
 	depends on DVB_CORE
 

drivers/media/dvb-frontends/Makefile

@@ -115,3 +115,4 @@ obj-$(CONFIG_DVB_RTL2832_SDR) += rtl2832_sdr.o
 obj-$(CONFIG_DVB_M88RS2000) += m88rs2000.o
 obj-$(CONFIG_DVB_AF9033) += af9033.o
 obj-$(CONFIG_DVB_AS102_FE) += as102_fe.o
+obj-$(CONFIG_DVB_TC90522) += tc90522.o

drivers/media/dvb-frontends/tc90522.h

@@ -0,0 +1,42 @@
+/*
+ * Toshiba TC90522 Demodulator
+ *
+ * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
+ *
+ * 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 version 2.
+ *
+ *
+ * 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.
+ */
+
+/*
+ * The demod has 4 input (2xISDB-T and 2xISDB-S),
+ * and provides independent sub modules for each input.
+ * As the sub modules work in parallel and have the separate i2c addr's,
+ * this driver treats each sub module as one demod device.
+ */
+
+#ifndef TC90522_H
+#define TC90522_H
+
+#include <linux/i2c.h>
+#include "dvb_frontend.h"
+
+/* I2C device types */
+#define TC90522_I2C_DEV_SAT "tc90522sat"
+#define TC90522_I2C_DEV_TER "tc90522ter"
+
+struct tc90522_config {
+	/* [OUT] frontend returned by driver */
+	struct dvb_frontend *fe;
+
+	/* [OUT] tuner I2C adapter returned by driver */
+	struct i2c_adapter *tuner_i2c;
+};
+
+#endif /* TC90522_H */