linux-stable/drivers/media/dvb-frontends/zd1301_demod.h
Arnd Bergmann 0d1270df83 [media] zd1301: fix building interface driver without demodulator
If the USB driver is enabled but the demodulator is not, we get a link error:

ERROR: "zd1301_demod_get_dvb_frontend" [drivers/media/usb/dvb-usb-v2/zd1301.ko] undefined!
ERROR: "zd1301_demod_get_i2c_adapter" [drivers/media/usb/dvb-usb-v2/zd1301.ko] undefined!

Such a configuration obviously makes no sense, but we should not fail
the build.  This tries to mimic what we have for other drivers by turning
the build failure into a runtime failure.

Alternatively we could use an unconditional 'select' or 'depends on' to enforce
a sane configuration.

Fixes: 47d65372b3 ("[media] zd1301_demod: ZyDAS ZD1301 DVB-T demodulator driver")
Fixes: 992b39872b ("[media] zd1301: ZyDAS ZD1301 DVB USB interface driver")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-02-08 11:59:39 -02:00

73 lines
2 KiB
C

/*
* ZyDAS ZD1301 driver (demodulator)
*
* Copyright (C) 2015 Antti Palosaari <crope@iki.fi>
*
* 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.
*/
#ifndef ZD1301_DEMOD_H
#define ZD1301_DEMOD_H
#include <linux/platform_device.h>
#include <linux/dvb/frontend.h>
#include "dvb_frontend.h"
/**
* struct zd1301_demod_platform_data - Platform data for the zd1301_demod driver
* @reg_priv: First argument of reg_read and reg_write callbacks.
* @reg_read: Register read callback.
* @reg_write: Register write callback.
*/
struct zd1301_demod_platform_data {
void *reg_priv;
int (*reg_read)(void *, u16, u8 *);
int (*reg_write)(void *, u16, u8);
};
#if IS_REACHABLE(CONFIG_DVB_ZD1301_DEMOD)
/**
* zd1301_demod_get_dvb_frontend() - Get pointer to DVB frontend
* @pdev: Pointer to platform device
*
* Return: Pointer to DVB frontend which given platform device owns.
*/
struct dvb_frontend *zd1301_demod_get_dvb_frontend(struct platform_device *);
/**
* zd1301_demod_get_i2c_adapter() - Get pointer to I2C adapter
* @pdev: Pointer to platform device
*
* Return: Pointer to I2C adapter which given platform device owns.
*/
struct i2c_adapter *zd1301_demod_get_i2c_adapter(struct platform_device *);
#else
static inline struct dvb_frontend *zd1301_demod_get_dvb_frontend(struct platform_device *dev)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
static inline struct i2c_adapter *zd1301_demod_get_i2c_adapter(struct platform_device *dev)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif
#endif /* ZD1301_DEMOD_H */