linux/drivers/media/dvb-frontends/drxk.h

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#ifndef _DRXK_H_
#define _DRXK_H_
#include <linux/types.h>
#include <linux/i2c.h>
/**
* struct drxk_config - Configure the initial parameters for DRX-K
*
* @adr: I2C address of the DRX-K
* @parallel_ts: True means that the device uses parallel TS,
* Serial otherwise.
* @dynamic_clk: True means that the clock will be dynamically
* adjusted. Static clock otherwise.
* @enable_merr_cfg: Enable SIO_PDR_PERR_CFG/SIO_PDR_MVAL_CFG.
* @single_master: Device is on the single master mode
* @no_i2c_bridge: Don't switch the I2C bridge to talk with tuner
* @antenna_gpio: GPIO bit used to control the antenna
* @antenna_dvbt: GPIO bit for changing antenna to DVB-C. A value of 1
* means that 1=DVBC, 0 = DVBT. Zero means the opposite.
* @mpeg_out_clk_strength: DRXK Mpeg output clock drive strength.
* @microcode_name: Name of the firmware file with the microcode
* @qam_demod_parameter_count: The number of parameters used for the command
* to set the demodulator parameters. All
* firmwares are using the 2-parameter commmand.
* An exception is the "drxk_a3.mc" firmware,
* which uses the 4-parameter command.
* A value of 0 (default) or lower indicates that
* the correct number of parameters will be
* automatically detected.
*
* On the *_gpio vars, bit 0 is UIO-1, bit 1 is UIO-2 and bit 2 is
* UIO-3.
*/
struct drxk_config {
u8 adr;
bool single_master;
bool no_i2c_bridge;
bool parallel_ts;
bool dynamic_clk;
bool enable_merr_cfg;
bool antenna_dvbt;
u16 antenna_gpio;
u8 mpeg_out_clk_strength;
int chunk_size;
const char *microcode_name;
int qam_demod_parameter_count;
};
[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: 7b34be71db53 ("[media] use IS_ENABLED() macro") See-also: c5dec9fb248e ("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>
2015-02-19 01:12:42 +08:00
#if IS_REACHABLE(CONFIG_DVB_DRXK)
extern struct dvb_frontend *drxk_attach(const struct drxk_config *config,
struct i2c_adapter *i2c);
#else
static inline struct dvb_frontend *drxk_attach(const struct drxk_config *config,
struct i2c_adapter *i2c)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif
#endif