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

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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: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Antti Palosaari <crope@iki.fi>
This commit is contained in:
Mauro Carvalho Chehab 2013-04-05 14:35:18 -03:00
parent 098af4bde0
commit a80abc58fe
4 changed files with 1549 additions and 0 deletions
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7
drivers/media/tuners/Kconfig
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@ -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

1
drivers/media/tuners/Makefile
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@ -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

1486
drivers/media/tuners/r820t.c Normal file
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File diff suppressed because it is too large Load diff

55
drivers/media/tuners/r820t.h Normal file
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@ -0,0 +1,55 @@
/*
* 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