Commit a80abc58 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[media] r820t: Add a tuner driver for Rafael Micro R820T silicon tuner 

This driver was written from scratch, based on an existing driver
that it is part of rtl-sdr git tree, released under GPLv2:
	https://groups.google.com/forum/#!topic/ultra-cheap-sdr/Y3rBEOFtHug
	https://github.com/n1gp/gr-baz
	http://cgit.osmocom.org/rtl-sdr/plain/src/tuner_r820t.c


	(there are also other variants of it out there)
>From what I understood from the threads, the original driver was converted
to userspace from a Realtek tree. I couldn't find the original tree.
However, the original driver look awkward on my eyes. So, I decided to
write a new version from it from the scratch, while trying to reproduce
everything found there.
TODO:
- After locking, the original driver seems to have some routines to
  improve reception. This was not implemented here yet.
- RF Gain set/get is not implemented.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: default avatarAntti Palosaari <crope@iki.fi>
parent 098af4bd

drivers/media/tuners/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -248,4 +248,11 @@ config MEDIA_TUNER_IT913X 
	default m if !MEDIA_SUBDRV_AUTOSELECT

	help

	  ITE Tech IT913x silicon tuner driver.



config MEDIA_TUNER_R820T

	tristate "Rafael Micro R820T silicon tuner"

	depends on MEDIA_SUPPORT && I2C

	default m if !MEDIA_SUBDRV_AUTOSELECT

	help

	  Rafael Micro R820T silicon tuner driver.

endmenu

drivers/media/tuners/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ obj-$(CONFIG_MEDIA_TUNER_FC0011) += fc0011.o 
obj-$(CONFIG_MEDIA_TUNER_FC0012) += fc0012.o

obj-$(CONFIG_MEDIA_TUNER_FC0013) += fc0013.o

obj-$(CONFIG_MEDIA_TUNER_IT913X) += tuner_it913x.o

obj-$(CONFIG_MEDIA_TUNER_R820T) += r820t.o



ccflags-y += -I$(srctree)/drivers/media/dvb-core

ccflags-y += -I$(srctree)/drivers/media/dvb-frontends

drivers/media/tuners/r820t.c

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+1486 −0

File added.

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drivers/media/tuners/r820t.h

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/*

 * Elonics R820T silicon tuner driver

 *

 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>

 *

 *    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.

 *

 *    You should have received a copy of the GNU General Public License along

 *    with this program; if not, write to the Free Software Foundation, Inc.,

 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */



#ifndef R820T_H

#define R820T_H



#include <linux/kconfig.h>

#include "dvb_frontend.h"



enum r820t_chip {

	CHIP_R820T,

	CHIP_R828S,

	CHIP_R820C,

};



struct r820t_config {

	u8 i2c_addr;		/* 0x34 */



	u32 xtal;

	enum r820t_chip rafael_chip;

	unsigned max_i2c_msg_len;

};



#if IS_ENABLED(CONFIG_MEDIA_TUNER_R820T)

struct dvb_frontend *r820t_attach(struct dvb_frontend *fe,

				  struct i2c_adapter *i2c,

				  const struct r820t_config *cfg);

#else

static inline struct dvb_frontend *r820t_attach(struct dvb_frontend *fe,

						struct i2c_adapter *i2c,

						const struct r820t_config *cfg)

{

	pr_warn("%s: driver disabled by Kconfig\n", __func__);

	return NULL;

}

#endif



#endif

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