mirror of
https://github.com/torvalds/linux.git
synced 2024-12-17 16:43:08 +00:00
9b174527e7
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>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
|
|
* drxd.h: DRXD DVB-T demodulator driver
|
|
*
|
|
* Copyright (C) 2005-2007 Micronas
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 only, as published by the Free Software Foundation.
|
|
*
|
|
*
|
|
* 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
|
|
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
#ifndef _DRXD_H_
|
|
#define _DRXD_H_
|
|
|
|
#include <linux/kconfig.h>
|
|
#include <linux/types.h>
|
|
#include <linux/i2c.h>
|
|
|
|
struct drxd_config {
|
|
u8 index;
|
|
|
|
u8 pll_address;
|
|
u8 pll_type;
|
|
#define DRXD_PLL_NONE 0
|
|
#define DRXD_PLL_DTT7520X 1
|
|
#define DRXD_PLL_MT3X0823 2
|
|
|
|
u32 clock;
|
|
u8 insert_rs_byte;
|
|
|
|
u8 demod_address;
|
|
u8 demoda_address;
|
|
u8 demod_revision;
|
|
|
|
/* If the tuner is not behind an i2c gate, be sure to flip this bit
|
|
or else the i2c bus could get wedged */
|
|
u8 disable_i2c_gate_ctrl;
|
|
|
|
u32 IF;
|
|
s16(*osc_deviation) (void *priv, s16 dev, int flag);
|
|
};
|
|
|
|
#if IS_REACHABLE(CONFIG_DVB_DRXD)
|
|
extern
|
|
struct dvb_frontend *drxd_attach(const struct drxd_config *config,
|
|
void *priv, struct i2c_adapter *i2c,
|
|
struct device *dev);
|
|
#else
|
|
static inline
|
|
struct dvb_frontend *drxd_attach(const struct drxd_config *config,
|
|
void *priv, struct i2c_adapter *i2c,
|
|
struct device *dev)
|
|
{
|
|
printk(KERN_INFO "%s: not probed - driver disabled by Kconfig\n",
|
|
__func__);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif
|