WSL2-Linux-Kernel/drivers/media/dvb-frontends/lgdt330x.h

68 строки
2.0 KiB
C
Исходник Обычный вид История

/*
* Support for LGDT3302 and LGDT3303 - VSB/QAM
*
* Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.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 LGDT330X_H
#define LGDT330X_H
#include <linux/dvb/frontend.h>
typedef enum lg_chip_t {
UNDEFINED,
LGDT3302,
LGDT3303
}lg_chip_type;
struct lgdt330x_config
{
/* The demodulator's i2c address */
u8 demod_address;
/* LG demodulator chip LGDT3302 or LGDT3303 */
lg_chip_type demod_chip;
/* MPEG hardware interface - 0:parallel 1:serial */
int serial_mpeg;
/* PLL interface */
int (*pll_rf_set) (struct dvb_frontend* fe, int index);
/* Need to set device param for start_dma */
int (*set_ts_params)(struct dvb_frontend* fe, int is_punctured);
/* Flip the polarity of the mpeg data transfer clock using alternate init data
* This option applies ONLY to LGDT3303 - 0:disabled (default) 1:enabled */
int clock_polarity_flip;
};
[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: 7b34be71db53 ("[media] use IS_ENABLED() macro") See-also: c5dec9fb248e ("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>
2015-02-18 20:12:42 +03:00
#if IS_REACHABLE(CONFIG_DVB_LGDT330X)
extern struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config,
struct i2c_adapter* i2c);
#else
static inline struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config,
struct i2c_adapter* i2c)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif // CONFIG_DVB_LGDT330X
#endif /* LGDT330X_H */