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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>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* descriptions + helper functions for simple dvb plls.
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*/
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#ifndef __DVB_PLL_H__
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#define __DVB_PLL_H__
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#include <linux/i2c.h>
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#include "dvb_frontend.h"
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#define DVB_PLL_UNDEFINED 0
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#define DVB_PLL_THOMSON_DTT7579 1
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#define DVB_PLL_THOMSON_DTT759X 2
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#define DVB_PLL_LG_Z201 3
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#define DVB_PLL_UNKNOWN_1 4
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#define DVB_PLL_TUA6010XS 5
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#define DVB_PLL_ENV57H1XD5 6
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#define DVB_PLL_TUA6034 7
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#define DVB_PLL_TDA665X 8
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#define DVB_PLL_TDED4 9
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#define DVB_PLL_TDHU2 10
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#define DVB_PLL_SAMSUNG_TBMV 11
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#define DVB_PLL_PHILIPS_SD1878_TDA8261 12
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#define DVB_PLL_OPERA1 13
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#define DVB_PLL_SAMSUNG_DTOS403IH102A 14
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#define DVB_PLL_SAMSUNG_TDTC9251DH0 15
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#define DVB_PLL_SAMSUNG_TBDU18132 16
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#define DVB_PLL_SAMSUNG_TBMU24112 17
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#define DVB_PLL_TDEE4 18
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#define DVB_PLL_THOMSON_DTT7520X 19
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/**
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* Attach a dvb-pll to the supplied frontend structure.
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*
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* @param fe Frontend to attach to.
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* @param pll_addr i2c address of the PLL (if used).
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* @param i2c i2c adapter to use (set to NULL if not used).
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* @param pll_desc_id dvb_pll_desc to use.
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* @return Frontend pointer on success, NULL on failure
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*/
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#if IS_REACHABLE(CONFIG_DVB_PLL)
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extern struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe,
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int pll_addr,
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struct i2c_adapter *i2c,
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unsigned int pll_desc_id);
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#else
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static inline struct dvb_frontend *dvb_pll_attach(struct dvb_frontend *fe,
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int pll_addr,
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struct i2c_adapter *i2c,
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unsigned int pll_desc_id)
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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
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#endif
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