forked from Minki/linux
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>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* Driver for DiBcom DiB3000MC/P-demodulator.
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*
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* Copyright (C) 2004-6 DiBcom (http://www.dibcom.fr/)
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* Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher\@desy.de)
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*
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* This code is partially based on the previous dib3000mc.c .
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*/
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#ifndef DIB3000MC_H
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#define DIB3000MC_H
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#include <linux/kconfig.h>
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#include "dibx000_common.h"
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struct dib3000mc_config {
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struct dibx000_agc_config *agc;
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u8 phase_noise_mode;
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u8 impulse_noise_mode;
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u8 pwm3_inversion;
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u8 use_pwm3;
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u16 pwm3_value;
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u16 max_time;
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u16 ln_adc_level;
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u8 agc_command1 :1;
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u8 agc_command2 :1;
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u8 mobile_mode;
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u8 output_mpeg2_in_188_bytes;
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};
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#define DEFAULT_DIB3000MC_I2C_ADDRESS 16
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#define DEFAULT_DIB3000P_I2C_ADDRESS 24
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#if IS_REACHABLE(CONFIG_DVB_DIB3000MC)
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extern struct dvb_frontend *dib3000mc_attach(struct i2c_adapter *i2c_adap,
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u8 i2c_addr,
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struct dib3000mc_config *cfg);
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extern int dib3000mc_i2c_enumeration(struct i2c_adapter *i2c,
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int no_of_demods, u8 default_addr,
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struct dib3000mc_config cfg[]);
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extern
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struct i2c_adapter *dib3000mc_get_tuner_i2c_master(struct dvb_frontend *demod,
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int gating);
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#else
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static inline
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struct dvb_frontend *dib3000mc_attach(struct i2c_adapter *i2c_adap, u8 i2c_addr,
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struct dib3000mc_config *cfg)
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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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static inline
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int dib3000mc_i2c_enumeration(struct i2c_adapter *i2c,
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int no_of_demods, u8 default_addr,
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struct dib3000mc_config cfg[])
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{
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printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
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return -ENODEV;
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}
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static inline
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struct i2c_adapter *dib3000mc_get_tuner_i2c_master(struct dvb_frontend *demod,
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int gating)
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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_DIB3000MC
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extern int dib3000mc_pid_control(struct dvb_frontend *fe, int index, int pid,int onoff);
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extern int dib3000mc_pid_parse(struct dvb_frontend *fe, int onoff);
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extern void dib3000mc_set_config(struct dvb_frontend *, struct dib3000mc_config *);
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#endif
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