mirror of
https://github.com/torvalds/linux.git
synced 2024-12-17 08:31:39 +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>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
|
|
* isl6405.h - driver for dual lnb supply and control ic ISL6405
|
|
*
|
|
* Copyright (C) 2008 Hartmut Hackmann
|
|
* Copyright (C) 2006 Oliver Endriss
|
|
*
|
|
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
|
|
*
|
|
*
|
|
* the project's page is at http://www.linuxtv.org
|
|
*/
|
|
|
|
#ifndef _ISL6405_H
|
|
#define _ISL6405_H
|
|
|
|
#include <linux/dvb/frontend.h>
|
|
|
|
/* system register bits */
|
|
|
|
/* this bit selects register (control) 1 or 2
|
|
note that the bit maps are different */
|
|
|
|
#define ISL6405_SR 0x80
|
|
|
|
/* SR = 0 */
|
|
#define ISL6405_OLF1 0x01
|
|
#define ISL6405_EN1 0x02
|
|
#define ISL6405_VSEL1 0x04
|
|
#define ISL6405_LLC1 0x08
|
|
#define ISL6405_ENT1 0x10
|
|
#define ISL6405_ISEL1 0x20
|
|
#define ISL6405_DCL 0x40
|
|
|
|
/* SR = 1 */
|
|
#define ISL6405_OLF2 0x01
|
|
#define ISL6405_OTF 0x02
|
|
#define ISL6405_EN2 0x04
|
|
#define ISL6405_VSEL2 0x08
|
|
#define ISL6405_LLC2 0x10
|
|
#define ISL6405_ENT2 0x20
|
|
#define ISL6405_ISEL2 0x40
|
|
|
|
#if IS_REACHABLE(CONFIG_DVB_ISL6405)
|
|
/* override_set and override_clear control which system register bits (above)
|
|
* to always set & clear
|
|
*/
|
|
extern struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
|
|
u8 i2c_addr, u8 override_set, u8 override_clear);
|
|
#else
|
|
static inline struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe,
|
|
struct i2c_adapter *i2c, u8 i2c_addr,
|
|
u8 override_set, u8 override_clear)
|
|
{
|
|
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_DVB_ISL6405 */
|
|
|
|
#endif
|