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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>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* tuner-xc2028
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*
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* Copyright (c) 2007-2008 Mauro Carvalho Chehab (mchehab@infradead.org)
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* This code is placed under the terms of the GNU General Public License v2
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*/
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#ifndef __TUNER_XC2028_H__
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#define __TUNER_XC2028_H__
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#include "dvb_frontend.h"
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#define XC2028_DEFAULT_FIRMWARE "xc3028-v27.fw"
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#define XC3028L_DEFAULT_FIRMWARE "xc3028L-v36.fw"
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/* Dmoduler IF (kHz) */
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#define XC3028_FE_DEFAULT 0 /* Don't load SCODE */
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#define XC3028_FE_LG60 6000
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#define XC3028_FE_ATI638 6380
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#define XC3028_FE_OREN538 5380
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#define XC3028_FE_OREN36 3600
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#define XC3028_FE_TOYOTA388 3880
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#define XC3028_FE_TOYOTA794 7940
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#define XC3028_FE_DIBCOM52 5200
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#define XC3028_FE_ZARLINK456 4560
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#define XC3028_FE_CHINA 5200
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enum firmware_type {
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XC2028_AUTO = 0, /* By default, auto-detects */
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XC2028_D2633,
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XC2028_D2620,
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};
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struct xc2028_ctrl {
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char *fname;
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int max_len;
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int msleep;
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unsigned int scode_table;
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unsigned int mts :1;
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unsigned int input1:1;
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unsigned int vhfbw7:1;
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unsigned int uhfbw8:1;
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unsigned int disable_power_mgmt:1;
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unsigned int read_not_reliable:1;
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unsigned int demod;
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enum firmware_type type:2;
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};
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struct xc2028_config {
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struct i2c_adapter *i2c_adap;
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u8 i2c_addr;
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struct xc2028_ctrl *ctrl;
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};
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/* xc2028 commands for callback */
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#define XC2028_TUNER_RESET 0
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#define XC2028_RESET_CLK 1
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#define XC2028_I2C_FLUSH 2
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#if IS_REACHABLE(CONFIG_MEDIA_TUNER_XC2028)
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extern struct dvb_frontend *xc2028_attach(struct dvb_frontend *fe,
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struct xc2028_config *cfg);
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#else
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static inline struct dvb_frontend *xc2028_attach(struct dvb_frontend *fe,
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struct xc2028_config *cfg)
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{
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printk(KERN_INFO "%s: not probed - driver disabled by Kconfig\n",
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__func__);
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return NULL;
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}
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#endif
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#endif /* __TUNER_XC2028_H__ */
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