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linux/drivers/media/dvb-frontends/dib0090.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

188 lines
5.5 KiB
C
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/*
* Linux-DVB Driver for DiBcom's DiB0090 base-band RF Tuner.
*
* Copyright (C) 2005-7 DiBcom (http://www.dibcom.fr/)
*
* 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, version 2.
*/
#ifndef DIB0090_H
#define DIB0090_H
struct dvb_frontend;
struct i2c_adapter;
#define DEFAULT_DIB0090_I2C_ADDRESS 0x60
struct dib0090_io_config {
u32 clock_khz;
u8 pll_bypass:1;
u8 pll_range:1;
u8 pll_prediv:6;
u8 pll_loopdiv:6;
u8 adc_clock_ratio; /* valid is 8, 7 ,6 */
u16 pll_int_loop_filt;
};
struct dib0090_wbd_slope {
u16 max_freq; /* for every frequency less than or equal to that field: this information is correct */
u16 slope_cold;
u16 offset_cold;
u16 slope_hot;
u16 offset_hot;
u8 wbd_gain;
};
struct dib0090_low_if_offset_table {
int std;
u32 RF_freq;
s32 offset_khz;
};
struct dib0090_config {
struct dib0090_io_config io;
int (*reset) (struct dvb_frontend *, int);
int (*sleep) (struct dvb_frontend *, int);
/* offset in kHz */
int freq_offset_khz_uhf;
int freq_offset_khz_vhf;
int (*get_adc_power) (struct dvb_frontend *);
u8 clkouttobamse:1; /* activate or deactivate clock output */
u8 analog_output;
u8 i2c_address;
/* add drives and other things if necessary */
u16 wbd_vhf_offset;
u16 wbd_cband_offset;
u8 use_pwm_agc;
u8 clkoutdrive;
u8 ls_cfg_pad_drv;
u8 data_tx_drv;
u8 in_soc;
const struct dib0090_low_if_offset_table *low_if;
u8 fref_clock_ratio;
u16 force_cband_input;
struct dib0090_wbd_slope *wbd;
u8 is_dib7090e;
u8 force_crystal_mode;
};
#if IS_REACHABLE(CONFIG_DVB_TUNER_DIB0090)
extern struct dvb_frontend *dib0090_register(struct dvb_frontend *fe, struct i2c_adapter *i2c, const struct dib0090_config *config);
extern struct dvb_frontend *dib0090_fw_register(struct dvb_frontend *fe, struct i2c_adapter *i2c, const struct dib0090_config *config);
extern void dib0090_dcc_freq(struct dvb_frontend *fe, u8 fast);
extern void dib0090_pwm_gain_reset(struct dvb_frontend *fe);
extern u16 dib0090_get_wbd_target(struct dvb_frontend *tuner);
extern u16 dib0090_get_wbd_offset(struct dvb_frontend *fe);
extern int dib0090_gain_control(struct dvb_frontend *fe);
extern enum frontend_tune_state dib0090_get_tune_state(struct dvb_frontend *fe);
extern int dib0090_set_tune_state(struct dvb_frontend *fe, enum frontend_tune_state tune_state);
extern void dib0090_get_current_gain(struct dvb_frontend *fe, u16 * rf, u16 * bb, u16 * rf_gain_limit, u16 * rflt);
extern void dib0090_set_dc_servo(struct dvb_frontend *fe, u8 DC_servo_cutoff);
extern int dib0090_set_switch(struct dvb_frontend *fe, u8 sw1, u8 sw2, u8 sw3);
extern int dib0090_set_vga(struct dvb_frontend *fe, u8 onoff);
extern int dib0090_update_rframp_7090(struct dvb_frontend *fe,
u8 cfg_sensitivity);
extern int dib0090_update_tuning_table_7090(struct dvb_frontend *fe,
u8 cfg_sensitivity);
#else
static inline struct dvb_frontend *dib0090_register(struct dvb_frontend *fe, struct i2c_adapter *i2c, const struct dib0090_config *config)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
static inline struct dvb_frontend *dib0090_fw_register(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct dib0090_config *config)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
static inline void dib0090_dcc_freq(struct dvb_frontend *fe, u8 fast)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
}
static inline void dib0090_pwm_gain_reset(struct dvb_frontend *fe)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
}
static inline u16 dib0090_get_wbd_target(struct dvb_frontend *tuner)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return 0;
}
static inline u16 dib0090_get_wbd_offset(struct dvb_frontend *fe)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return 0;
}
static inline int dib0090_gain_control(struct dvb_frontend *fe)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return -ENODEV;
}
static inline enum frontend_tune_state dib0090_get_tune_state(struct dvb_frontend *fe)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return CT_DONE;
}
static inline int dib0090_set_tune_state(struct dvb_frontend *fe, enum frontend_tune_state tune_state)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return -ENODEV;
}
static inline void dib0090_get_current_gain(struct dvb_frontend *fe, u16 * rf, u16 * bb, u16 * rf_gain_limit, u16 * rflt)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
}
static inline void dib0090_set_dc_servo(struct dvb_frontend *fe, u8 DC_servo_cutoff)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
}
static inline int dib0090_set_switch(struct dvb_frontend *fe,
u8 sw1, u8 sw2, u8 sw3)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return -ENODEV;
}
static inline int dib0090_set_vga(struct dvb_frontend *fe, u8 onoff)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return -ENODEV;
}
static inline int dib0090_update_rframp_7090(struct dvb_frontend *fe,
u8 cfg_sensitivity)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return -ENODEV;
}
static inline int dib0090_update_tuning_table_7090(struct dvb_frontend *fe,
u8 cfg_sensitivity)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return -ENODEV;
}
#endif
#endif
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