bitbash.h File Reference

Bit-bashing interfaces. More...

Go to the source code of this file.

Data Structures
struct	bit_basher_operations
	Bit-bashing operations. More...
struct	bit_basher
	A bit-bashing interface. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
static void	open_bit (struct bit_basher *basher)
	Open bit-bashing interface.
static void	close_bit (struct bit_basher *basher)
	Close bit-bashing interface.
void	write_bit (struct bit_basher *basher, unsigned int bit_id, unsigned long data)
	Set/clear output bit.
int	read_bit (struct bit_basher *basher, unsigned int bit_id)
	Read input bit.

Detailed Description

Bit-bashing interfaces.

Definition in file bitbash.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

open_bit()

void open_bit ( struct bit_basher * basher )

inlinestatic

Open bit-bashing interface.

Parameters

basher

Bit-bashing interface

Definition at line 66 of file bitbash.h.

                                                          {
        if ( basher->op->open )
                basher->op->open ( basher );
}

References bit_basher::op, and bit_basher_operations::open.

Referenced by i2c_bit_read(), i2c_bit_write(), i2c_reset(), and spi_bit_rw().

close_bit()

void close_bit ( struct bit_basher * basher )

inlinestatic

Close bit-bashing interface.

Parameters

basher

Bit-bashing interface

Definition at line 76 of file bitbash.h.

                                                           {
        if ( basher->op->close )
                basher->op->close ( basher );
}

References bit_basher_operations::close, and bit_basher::op.

Referenced by i2c_bit_read(), i2c_bit_write(), i2c_reset(), and spi_bit_rw().

write_bit()

void write_bit ( struct bit_basher * basher, unsigned int bit_id, unsigned long data )

extern

Set/clear output bit.

Parameters

basher	Bit-bashing interface
bit_id	Bit number
data	Value to write

If data is 0, a logic 0 will be written. If data is non-zero, a logic 1 will be written.

Definition at line 45 of file bitbash.c.

                                      {
        basher->op->write ( basher, bit_id, ( data ? -1UL : 0 ) );
}

References data, bit_basher::op, and bit_basher_operations::write.

Referenced by mii_bit_rw(), mii_bit_xfer(), setscl(), setsda(), spi_bit_rw(), spi_bit_set_slave_select(), and spi_bit_transfer().

read_bit()

int read_bit ( struct bit_basher * basher, unsigned int bit_id )

extern

Read input bit.

Parameters

basher	Bit-bashing interface
bit_id	Bit number

Return values

data	Value read

data will always be either 0 or -1UL. The idea is that the caller can simply binary-AND the returned value with whatever mask it needs to apply.

Definition at line 61 of file bitbash.c.

                                                                {
        return ( basher->op->read ( basher, bit_id ) ? -1UL : 0 );
}

References bit_basher::op, and bit_basher_operations::read.

Referenced by getsda(), mii_bit_xfer(), and spi_bit_transfer().