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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>
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
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* Driver for Zarlink DVB-T MT352 demodulator
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*
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* Written by Holger Waechtler <holger@qanu.de>
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* and Daniel Mack <daniel@qanu.de>
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*
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* AVerMedia AVerTV DVB-T 771 support by
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* Wolfram Joost <dbox2@frokaschwei.de>
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*
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* Support for Samsung TDTC9251DH01C(M) tuner
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* Copyright (C) 2004 Antonio Mancuso <antonio.mancuso@digitaltelevision.it>
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* Amauri Celani <acelani@essegi.net>
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*
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* DVICO FusionHDTV DVB-T1 and DVICO FusionHDTV DVB-T Lite support by
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* Christopher Pascoe <c.pascoe@itee.uq.edu.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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*
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
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*/
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#ifndef MT352_H
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#define MT352_H
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#include <linux/dvb/frontend.h>
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struct mt352_config
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{
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/* the demodulator's i2c address */
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u8 demod_address;
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/* frequencies in kHz */
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int adc_clock; // default: 20480
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int if2; // default: 36166
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/* set if no pll is connected to the secondary i2c bus */
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int no_tuner;
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/* Initialise the demodulator and PLL. Cannot be NULL */
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int (*demod_init)(struct dvb_frontend* fe);
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};
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#if IS_REACHABLE(CONFIG_DVB_MT352)
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extern struct dvb_frontend* mt352_attach(const struct mt352_config* config,
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struct i2c_adapter* i2c);
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#else
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static inline struct dvb_frontend* mt352_attach(const struct mt352_config* config,
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struct i2c_adapter* i2c)
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{
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printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
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return NULL;
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}
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#endif // CONFIG_DVB_MT352
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static inline int mt352_write(struct dvb_frontend *fe, const u8 buf[], int len) {
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int r = 0;
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if (fe->ops.write)
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r = fe->ops.write(fe, buf, len);
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return r;
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}
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#endif // MT352_H
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