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linux-next/drivers/media/dvb-frontends/stv0299.h
Arnd Bergmann 9b174527e7 [media] Add and use IS_REACHABLE macro
In the media drivers, the v4l2 core knows about all submodules
and calls into them from a common function. However this cannot
work if the modules that get called are loadable and the
core is built-in. In that case we get

drivers/built-in.o: In function `set_type':
drivers/media/v4l2-core/tuner-core.c:301: undefined reference to `tea5767_attach'
drivers/media/v4l2-core/tuner-core.c:307: undefined reference to `tea5761_attach'
drivers/media/v4l2-core/tuner-core.c:349: undefined reference to `tda9887_attach'
drivers/media/v4l2-core/tuner-core.c:405: undefined reference to `xc4000_attach'

This was working previously, until the IS_ENABLED() macro was used
to replace the construct like

 #if defined(CONFIG_DVB_CX24110) || (defined(CONFIG_DVB_CX24110_MODULE) && defined(MODULE))

with the difference that the new code no longer checks whether it is being
built as a loadable module itself.

To fix this, this new patch adds an 'IS_REACHABLE' macro, which evaluates
true in exactly the condition that was used previously. The downside
of this is that this trades an obvious link error for a more subtle
runtime failure, but it is clear that the change that introduced the
link error was unintentional and it seems better to revert it for
now. Also, a similar change was originally created by Trent Piepho
and then reverted by teh change to the IS_ENABLED macro.

Ideally Kconfig would be used to avoid the case of a broken dependency,
or the code restructured in a way to turn around the dependency, but either
way would require much larger changes here.

Fixes: 7b34be71db ("[media] use IS_ENABLED() macro")
See-also: c5dec9fb24 ("V4L/DVB (4751): Fix DBV_FE_CUSTOMISE for card drivers compiled into kernel")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2015-04-08 15:02:07 -03:00

119 lines
3.0 KiB
C

/*
Driver for ST STV0299 demodulator
Copyright (C) 2001-2002 Convergence Integrated Media GmbH
<ralph@convergence.de>,
<holger@convergence.de>,
<js@convergence.de>
Philips SU1278/SH
Copyright (C) 2002 by Peter Schildmann <peter.schildmann@web.de>
LG TDQF-S001F
Copyright (C) 2002 Felix Domke <tmbinc@elitedvb.net>
& Andreas Oberritter <obi@linuxtv.org>
Support for Samsung TBMU24112IMB used on Technisat SkyStar2 rev. 2.6B
Copyright (C) 2003 Vadim Catana <skystar@moldova.cc>:
Support for Philips SU1278 on Technotrend hardware
Copyright (C) 2004 Andrew de Quincey <adq_dvb@lidskialf.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef STV0299_H
#define STV0299_H
#include <linux/dvb/frontend.h>
#include "dvb_frontend.h"
#define STV0299_LOCKOUTPUT_0 0
#define STV0299_LOCKOUTPUT_1 1
#define STV0299_LOCKOUTPUT_CF 2
#define STV0299_LOCKOUTPUT_LK 3
#define STV0299_VOLT13_OP0 0
#define STV0299_VOLT13_OP1 1
struct stv0299_config
{
/* the demodulator's i2c address */
u8 demod_address;
/* inittab - array of pairs of values.
* First of each pair is the register, second is the value.
* List should be terminated with an 0xff, 0xff pair.
*/
const u8* inittab;
/* master clock to use */
u32 mclk;
/* does the inversion require inversion? */
u8 invert:1;
/* Skip reinitialisation? */
u8 skip_reinit:1;
/* LOCK OUTPUT setting */
u8 lock_output:2;
/* Is 13v controlled by OP0 or OP1? */
u8 volt13_op0_op1:1;
/* Turn-off OP0? */
u8 op0_off:1;
/* minimum delay before retuning */
int min_delay_ms;
/* Set the symbol rate */
int (*set_symbol_rate)(struct dvb_frontend *fe, u32 srate, u32 ratio);
/* Set device param to start dma */
int (*set_ts_params)(struct dvb_frontend *fe, int is_punctured);
};
#if IS_REACHABLE(CONFIG_DVB_STV0299)
extern struct dvb_frontend *stv0299_attach(const struct stv0299_config *config,
struct i2c_adapter *i2c);
#else
static inline struct dvb_frontend *stv0299_attach(const struct stv0299_config *config,
struct i2c_adapter *i2c)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif // CONFIG_DVB_STV0299
static inline int stv0299_writereg(struct dvb_frontend *fe, u8 reg, u8 val) {
int r = 0;
u8 buf[] = {reg, val};
if (fe->ops.write)
r = fe->ops.write(fe, buf, 2);
return r;
}
#endif // STV0299_H