media: dvb-frontends: add ST STV6111 DVB-S/S2 tuner frontend driver

This adds a frontend driver for the ST STV6111 DVB-S/S2 tuners. Like the
stv0910 demod frontend driver, this driver originates from the Digital
Devices' dddvb vendor driver package as of version 0.9.29, and was cleaned
up aswell. No functionality had to be removed though. Any camel case has
been converted to kernel_case, fixup patch has been proposed upstream.

Permission to reuse and mainline the driver code was formally granted by
Ralph Metzler <rjkm@metzlerbros.de>.
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Tested-by: Richard Scobie <r.scobie@clear.net.nz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/Kconfig

@@ -44,6 +44,15 @@ config DVB_STV6110x
 	help
 	  A Silicon tuner that supports DVB-S and DVB-S2 modes
 
+config DVB_STV6111
+	tristate "STV6111 based tuners"
+	depends on DVB_CORE && I2C
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  A Silicon tuner that supports DVB-S and DVB-S2 modes
+
+	  Say Y when you want to support these frontends.
+
 config DVB_M88DS3103
 	tristate "Montage Technology M88DS3103"
 	depends on DVB_CORE && I2C && I2C_MUX

drivers/media/dvb-frontends/Makefile

@@ -111,6 +111,7 @@ obj-$(CONFIG_DVB_CXD2841ER) += cxd2841er.o
 obj-$(CONFIG_DVB_DRXK) += drxk.o
 obj-$(CONFIG_DVB_TDA18271C2DD) += tda18271c2dd.o
 obj-$(CONFIG_DVB_STV0910) += stv0910.o
+obj-$(CONFIG_DVB_STV6111) += stv6111.o
 obj-$(CONFIG_DVB_SI2165) += si2165.o
 obj-$(CONFIG_DVB_A8293) += a8293.o
 obj-$(CONFIG_DVB_SP2) += sp2.o

drivers/media/dvb-frontends/stv6111.h

+#ifndef _STV6111_H_
+#define _STV6111_H_
+
+#if IS_REACHABLE(CONFIG_DVB_STV6111)
+
+extern struct dvb_frontend *stv6111_attach(struct dvb_frontend *fe,
+				struct i2c_adapter *i2c, u8 adr);
+
+#else
+
+static inline struct dvb_frontend *stv6111_attach(struct dvb_frontend *fe,
+				struct i2c_adapter *i2c, u8 adr)
+{
+	pr_warn("%s: Driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+
+#endif /* CONFIG_DVB_STV6111 */
+
+#endif /* _STV6111_H_ */