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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>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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Auvitek AU8522 QAM/8VSB demodulator driver
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Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
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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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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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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 __AU8522_H__
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#define __AU8522_H__
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#include <linux/kconfig.h>
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#include <linux/dvb/frontend.h>
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enum au8522_if_freq {
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AU8522_IF_6MHZ = 0,
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AU8522_IF_4MHZ,
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AU8522_IF_3_25MHZ,
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};
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struct au8522_led_config {
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u16 vsb8_strong;
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u16 qam64_strong;
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u16 qam256_strong;
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u16 gpio_output;
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/* unset hi bits, set low bits */
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u16 gpio_output_enable;
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u16 gpio_output_disable;
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u16 gpio_leds;
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u8 *led_states;
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unsigned int num_led_states;
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};
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struct au8522_config {
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/* the demodulator's i2c address */
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u8 demod_address;
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/* Return lock status based on tuner lock, or demod lock */
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#define AU8522_TUNERLOCKING 0
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#define AU8522_DEMODLOCKING 1
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u8 status_mode;
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struct au8522_led_config *led_cfg;
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enum au8522_if_freq vsb_if;
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enum au8522_if_freq qam_if;
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};
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#if IS_REACHABLE(CONFIG_DVB_AU8522_DTV)
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extern struct dvb_frontend *au8522_attach(const struct au8522_config *config,
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struct i2c_adapter *i2c);
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#else
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static inline
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struct dvb_frontend *au8522_attach(const struct au8522_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_AU8522 */
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/* Other modes may need to be added later */
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enum au8522_video_input {
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AU8522_COMPOSITE_CH1 = 1,
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AU8522_COMPOSITE_CH2,
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AU8522_COMPOSITE_CH3,
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AU8522_COMPOSITE_CH4,
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AU8522_COMPOSITE_CH4_SIF,
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AU8522_SVIDEO_CH13,
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AU8522_SVIDEO_CH24,
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};
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enum au8522_audio_input {
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AU8522_AUDIO_NONE,
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AU8522_AUDIO_SIF,
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};
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#endif /* __AU8522_H__ */
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