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linux-next/drivers/media/tuners/mxl5005s.h
Arnd Bergmann 9b174527e7 [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: 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>
2015-04-08 15:02:07 -03:00

137 lines
3.4 KiB
C

/*
MaxLinear MXL5005S VSB/QAM/DVBT tuner driver
Copyright (C) 2008 MaxLinear
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 __MXL5005S_H
#define __MXL5005S_H
#include <linux/kconfig.h>
#include <linux/i2c.h>
#include "dvb_frontend.h"
struct mxl5005s_config {
/* 7 bit i2c address */
u8 i2c_address;
#define IF_FREQ_4570000HZ 4570000
#define IF_FREQ_4571429HZ 4571429
#define IF_FREQ_5380000HZ 5380000
#define IF_FREQ_36000000HZ 36000000
#define IF_FREQ_36125000HZ 36125000
#define IF_FREQ_36166667HZ 36166667
#define IF_FREQ_44000000HZ 44000000
u32 if_freq;
#define CRYSTAL_FREQ_4000000HZ 4000000
#define CRYSTAL_FREQ_16000000HZ 16000000
#define CRYSTAL_FREQ_25000000HZ 25000000
#define CRYSTAL_FREQ_28800000HZ 28800000
u32 xtal_freq;
#define MXL_DUAL_AGC 0
#define MXL_SINGLE_AGC 1
u8 agc_mode;
#define MXL_TF_DEFAULT 0
#define MXL_TF_OFF 1
#define MXL_TF_C 2
#define MXL_TF_C_H 3
#define MXL_TF_D 4
#define MXL_TF_D_L 5
#define MXL_TF_E 6
#define MXL_TF_F 7
#define MXL_TF_E_2 8
#define MXL_TF_E_NA 9
#define MXL_TF_G 10
u8 tracking_filter;
#define MXL_RSSI_DISABLE 0
#define MXL_RSSI_ENABLE 1
u8 rssi_enable;
#define MXL_CAP_SEL_DISABLE 0
#define MXL_CAP_SEL_ENABLE 1
u8 cap_select;
#define MXL_DIV_OUT_1 0
#define MXL_DIV_OUT_4 1
u8 div_out;
#define MXL_CLOCK_OUT_DISABLE 0
#define MXL_CLOCK_OUT_ENABLE 1
u8 clock_out;
#define MXL5005S_IF_OUTPUT_LOAD_200_OHM 200
#define MXL5005S_IF_OUTPUT_LOAD_300_OHM 300
u32 output_load;
#define MXL5005S_TOP_5P5 55
#define MXL5005S_TOP_7P2 72
#define MXL5005S_TOP_9P2 92
#define MXL5005S_TOP_11P0 110
#define MXL5005S_TOP_12P9 129
#define MXL5005S_TOP_14P7 147
#define MXL5005S_TOP_16P8 168
#define MXL5005S_TOP_19P4 194
#define MXL5005S_TOP_21P2 212
#define MXL5005S_TOP_23P2 232
#define MXL5005S_TOP_25P2 252
#define MXL5005S_TOP_27P1 271
#define MXL5005S_TOP_29P2 292
#define MXL5005S_TOP_31P7 317
#define MXL5005S_TOP_34P9 349
u32 top;
#define MXL_ANALOG_MODE 0
#define MXL_DIGITAL_MODE 1
u8 mod_mode;
#define MXL_ZERO_IF 0
#define MXL_LOW_IF 1
u8 if_mode;
/* Some boards need to override the built-in logic for determining
the gain when in QAM mode (the HVR-1600 is one such case) */
u8 qam_gain;
/* Stuff I don't know what to do with */
u8 AgcMasterByte;
};
#if IS_REACHABLE(CONFIG_MEDIA_TUNER_MXL5005S)
extern struct dvb_frontend *mxl5005s_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c,
struct mxl5005s_config *config);
#else
static inline struct dvb_frontend *mxl5005s_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c,
struct mxl5005s_config *config)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif /* CONFIG_DVB_TUNER_MXL5005S */
#endif /* __MXL5005S_H */