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>
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*
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* Support for LG Electronics LGDT3304 and LGDT3305 - VSB/QAM
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*
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* Copyright (C) 2008, 2009, 2010 Michael Krufky <mkrufky@linuxtv.org>
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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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* 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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*/
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#ifndef _LGDT3305_H_
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#define _LGDT3305_H_
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#include <linux/kconfig.h>
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#include <linux/i2c.h>
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#include "dvb_frontend.h"
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enum lgdt3305_mpeg_mode {
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LGDT3305_MPEG_PARALLEL = 0,
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LGDT3305_MPEG_SERIAL = 1,
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};
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enum lgdt3305_tp_clock_edge {
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LGDT3305_TPCLK_RISING_EDGE = 0,
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LGDT3305_TPCLK_FALLING_EDGE = 1,
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};
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enum lgdt3305_tp_clock_mode {
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LGDT3305_TPCLK_GATED = 0,
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LGDT3305_TPCLK_FIXED = 1,
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};
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enum lgdt3305_tp_valid_polarity {
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LGDT3305_TP_VALID_LOW = 0,
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LGDT3305_TP_VALID_HIGH = 1,
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};
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enum lgdt_demod_chip_type {
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LGDT3305 = 0,
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LGDT3304 = 1,
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};
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struct lgdt3305_config {
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u8 i2c_addr;
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/* user defined IF frequency in KHz */
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u16 qam_if_khz;
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u16 vsb_if_khz;
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/* AGC Power reference - defaults are used if left unset */
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u16 usref_8vsb; /* default: 0x32c4 */
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u16 usref_qam64; /* default: 0x5400 */
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u16 usref_qam256; /* default: 0x2a80 */
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/* disable i2c repeater - 0:repeater enabled 1:repeater disabled */
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unsigned int deny_i2c_rptr:1;
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/* spectral inversion - 0:disabled 1:enabled */
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unsigned int spectral_inversion:1;
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/* use RF AGC loop - 0:disabled 1:enabled */
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unsigned int rf_agc_loop:1;
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enum lgdt3305_mpeg_mode mpeg_mode;
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enum lgdt3305_tp_clock_edge tpclk_edge;
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enum lgdt3305_tp_clock_mode tpclk_mode;
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enum lgdt3305_tp_valid_polarity tpvalid_polarity;
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enum lgdt_demod_chip_type demod_chip;
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};
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#if IS_REACHABLE(CONFIG_DVB_LGDT3305)
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extern
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struct dvb_frontend *lgdt3305_attach(const struct lgdt3305_config *config,
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struct i2c_adapter *i2c_adap);
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#else
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static inline
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struct dvb_frontend *lgdt3305_attach(const struct lgdt3305_config *config,
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struct i2c_adapter *i2c_adap)
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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_LGDT3305 */
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#endif /* _LGDT3305_H_ */
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