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When a front-end is disabled, card drivers that use it are compiled with a stub version of the front-end's attach function. This way they have no references to the front-end's code and don't need it to be loaded. If a card driver is compiled into the kernel, and a front-end is a module, then that front-end is effectively disabled wrt the card driver. In this case, the card driver should get the stub version. This was not happening. The stub vs real attach function selection is changed so that when the front-end is a module the real attach function is only used if the card driver is a module as well. This means a module front-end will be supported by card drivers that are modules and not supported by card drivers compiled into the kernel. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/*
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driver for LSI L64781 COFDM demodulator
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Copyright (C) 2001 Holger Waechtler for Convergence Integrated Media GmbH
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Marko Kohtala <marko.kohtala@luukku.com>
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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 L64781_H
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#define L64781_H
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#include <linux/dvb/frontend.h>
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struct l64781_config
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{
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/* the demodulator's i2c address */
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u8 demod_address;
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};
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#if defined(CONFIG_DVB_L64781) || (defined(CONFIG_DVB_L64781_MODULE) && defined(MODULE))
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extern struct dvb_frontend* l64781_attach(const struct l64781_config* config,
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struct i2c_adapter* i2c);
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#else
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static inline struct dvb_frontend* l64781_attach(const struct l64781_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", __FUNCTION__);
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return NULL;
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}
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#endif // CONFIG_DVB_L64781
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#endif // L64781_H
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