forked from Minki/linux
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>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
#ifndef _DRXK_H_
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#define _DRXK_H_
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#include <linux/kconfig.h>
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#include <linux/types.h>
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#include <linux/i2c.h>
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/**
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* struct drxk_config - Configure the initial parameters for DRX-K
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*
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* @adr: I2C address of the DRX-K
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* @parallel_ts: True means that the device uses parallel TS,
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* Serial otherwise.
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* @dynamic_clk: True means that the clock will be dynamically
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* adjusted. Static clock otherwise.
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* @enable_merr_cfg: Enable SIO_PDR_PERR_CFG/SIO_PDR_MVAL_CFG.
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* @single_master: Device is on the single master mode
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* @no_i2c_bridge: Don't switch the I2C bridge to talk with tuner
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* @antenna_gpio: GPIO bit used to control the antenna
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* @antenna_dvbt: GPIO bit for changing antenna to DVB-C. A value of 1
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* means that 1=DVBC, 0 = DVBT. Zero means the opposite.
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* @mpeg_out_clk_strength: DRXK Mpeg output clock drive strength.
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* @microcode_name: Name of the firmware file with the microcode
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* @qam_demod_parameter_count: The number of parameters used for the command
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* to set the demodulator parameters. All
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* firmwares are using the 2-parameter commmand.
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* An exception is the "drxk_a3.mc" firmware,
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* which uses the 4-parameter command.
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* A value of 0 (default) or lower indicates that
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* the correct number of parameters will be
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* automatically detected.
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*
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* On the *_gpio vars, bit 0 is UIO-1, bit 1 is UIO-2 and bit 2 is
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* UIO-3.
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*/
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struct drxk_config {
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u8 adr;
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bool single_master;
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bool no_i2c_bridge;
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bool parallel_ts;
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bool dynamic_clk;
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bool enable_merr_cfg;
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bool antenna_dvbt;
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u16 antenna_gpio;
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u8 mpeg_out_clk_strength;
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int chunk_size;
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const char *microcode_name;
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int qam_demod_parameter_count;
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};
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#if IS_REACHABLE(CONFIG_DVB_DRXK)
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extern struct dvb_frontend *drxk_attach(const struct drxk_config *config,
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struct i2c_adapter *i2c);
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#else
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static inline struct dvb_frontend *drxk_attach(const struct drxk_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", __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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