linux/drivers/media/dvb-frontends/lgdt3305.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

98 lines
2.6 KiB
C

/*
* Support for LG Electronics LGDT3304 and LGDT3305 - VSB/QAM
*
* Copyright (C) 2008, 2009, 2010 Michael Krufky <mkrufky@linuxtv.org>
*
* 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 _LGDT3305_H_
#define _LGDT3305_H_
#include <linux/kconfig.h>
#include <linux/i2c.h>
#include "dvb_frontend.h"
enum lgdt3305_mpeg_mode {
LGDT3305_MPEG_PARALLEL = 0,
LGDT3305_MPEG_SERIAL = 1,
};
enum lgdt3305_tp_clock_edge {
LGDT3305_TPCLK_RISING_EDGE = 0,
LGDT3305_TPCLK_FALLING_EDGE = 1,
};
enum lgdt3305_tp_clock_mode {
LGDT3305_TPCLK_GATED = 0,
LGDT3305_TPCLK_FIXED = 1,
};
enum lgdt3305_tp_valid_polarity {
LGDT3305_TP_VALID_LOW = 0,
LGDT3305_TP_VALID_HIGH = 1,
};
enum lgdt_demod_chip_type {
LGDT3305 = 0,
LGDT3304 = 1,
};
struct lgdt3305_config {
u8 i2c_addr;
/* user defined IF frequency in KHz */
u16 qam_if_khz;
u16 vsb_if_khz;
/* AGC Power reference - defaults are used if left unset */
u16 usref_8vsb; /* default: 0x32c4 */
u16 usref_qam64; /* default: 0x5400 */
u16 usref_qam256; /* default: 0x2a80 */
/* disable i2c repeater - 0:repeater enabled 1:repeater disabled */
unsigned int deny_i2c_rptr:1;
/* spectral inversion - 0:disabled 1:enabled */
unsigned int spectral_inversion:1;
/* use RF AGC loop - 0:disabled 1:enabled */
unsigned int rf_agc_loop:1;
enum lgdt3305_mpeg_mode mpeg_mode;
enum lgdt3305_tp_clock_edge tpclk_edge;
enum lgdt3305_tp_clock_mode tpclk_mode;
enum lgdt3305_tp_valid_polarity tpvalid_polarity;
enum lgdt_demod_chip_type demod_chip;
};
#if IS_REACHABLE(CONFIG_DVB_LGDT3305)
extern
struct dvb_frontend *lgdt3305_attach(const struct lgdt3305_config *config,
struct i2c_adapter *i2c_adap);
#else
static inline
struct dvb_frontend *lgdt3305_attach(const struct lgdt3305_config *config,
struct i2c_adapter *i2c_adap)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif /* CONFIG_DVB_LGDT3305 */
#endif /* _LGDT3305_H_ */