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linux/drivers/media/dvb-frontends/au8522.h

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/*
Auvitek AU8522 QAM/8VSB demodulator driver
Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __AU8522_H__
#define __AU8522_H__
#include <linux/dvb/frontend.h>
enum au8522_if_freq {
AU8522_IF_6MHZ = 0,
AU8522_IF_4MHZ,
AU8522_IF_3_25MHZ,
};
struct au8522_led_config {
u16 vsb8_strong;
u16 qam64_strong;
u16 qam256_strong;
u16 gpio_output;
/* unset hi bits, set low bits */
u16 gpio_output_enable;
u16 gpio_output_disable;
u16 gpio_leds;
u8 *led_states;
unsigned int num_led_states;
};
struct au8522_config {
/* the demodulator's i2c address */
u8 demod_address;
/* Return lock status based on tuner lock, or demod lock */
#define AU8522_TUNERLOCKING 0
#define AU8522_DEMODLOCKING 1
u8 status_mode;
struct au8522_led_config *led_cfg;
enum au8522_if_freq vsb_if;
enum au8522_if_freq qam_if;
};
[media] Add and use IS_REACHABLE macro 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: 7b34be71db53 ("[media] use IS_ENABLED() macro") See-also: c5dec9fb248e ("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>
2015-02-18 17:12:42 +00:00
#if IS_REACHABLE(CONFIG_DVB_AU8522_DTV)
extern struct dvb_frontend *au8522_attach(const struct au8522_config *config,
struct i2c_adapter *i2c);
#else
static inline
struct dvb_frontend *au8522_attach(const struct au8522_config *config,
struct i2c_adapter *i2c)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif /* CONFIG_DVB_AU8522 */
/* Other modes may need to be added later */
enum au8522_video_input {
AU8522_COMPOSITE_CH1 = 1,
AU8522_COMPOSITE_CH2,
AU8522_COMPOSITE_CH3,
AU8522_COMPOSITE_CH4,
AU8522_COMPOSITE_CH4_SIF,
AU8522_SVIDEO_CH13,
AU8522_SVIDEO_CH24,
};
enum au8522_audio_input {
AU8522_AUDIO_NONE,
AU8522_AUDIO_SIF,
};
#endif /* __AU8522_H__ */