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///////////////////////////////////////////////////////////////////////////////////////
// File I2C.xs
// Description: XS module for HiPi::Device::I2C
// Copyright: Copyright (c) 2013-2017 Mark Dootson
// License: This is free software; you can redistribute it and/or modify it under
// the same terms as the Perl 5 programming language system itself.
///////////////////////////////////////////////////////////////////////////////////////
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "mylib/include/ppport.h"
#include <sys/ioctl.h>
#include <i2c/smbus.h>
#include <linux/swab.h>
#define SCAN_MODE_AUTO 0
#define SCAN_MODE_QUICK 1
#define SCAN_MODE_READ 2
/* this is for i2c-dev.c */
#define I2C_SLAVE 0x0703 /* Change slave address */
/* Attn.: Slave address is 7 or 10 bits */
#define I2C_SLAVE_FORCE 0x0706 /* Change slave address */
/* Attn.: Slave address is 7 or 10 bits */
/* This changes the address, even if it */
/* is already taken! */
#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
#define I2C_FUNCS 0x0705 /* Get the adapter functionality */
#define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/
#define I2C_PEC 0x0708 /* != 0 for SMBus PEC */
#define I2C_SMBUS 0x0720 /* SMBus-level access */
/* This is the structure as used in the I2C_RDWR ioctl call */
struct i2c_rdwr_ioctl_data {
struct i2c_msg *msgs; /* pointers to i2c_msgs */
int nmsgs; /* number of i2c_msgs */
};
MODULE = HiPi::Device::I2C PACKAGE = HiPi::Device::I2C
__s32
i2c_smbus_write_quick(file, value)
int file
__u8 value
CODE:
RETVAL = i2c_smbus_write_quick(file, value);
OUTPUT: RETVAL
__s32
i2c_smbus_read_byte( file )
int file
CODE:
RETVAL = i2c_smbus_read_byte( file );
OUTPUT: RETVAL
__s32
i2c_smbus_write_byte(file, value)
int file
__u8 value
CODE:
RETVAL = i2c_smbus_write_byte( file, value );
OUTPUT: RETVAL
__s32
i2c_smbus_read_byte_data(file, command )
int file
__u8 command
CODE:
RETVAL = i2c_smbus_read_byte_data(file, command );
OUTPUT: RETVAL
__s32
i2c_smbus_write_byte_data( file, command, value)
int file
__u8 command
__u8 value
CODE:
RETVAL = i2c_smbus_write_byte_data(file, command, value );
OUTPUT: RETVAL
__s32
i2c_smbus_read_word_data(file, command)
int file
__u8 command
CODE:
RETVAL = i2c_smbus_read_word_data(file, command );
OUTPUT: RETVAL
__s32
i2c_smbus_write_word_data( file, command, value)
int file
__u8 command
__u16 value
CODE:
RETVAL = i2c_smbus_write_word_data(file, command, value );
OUTPUT: RETVAL
__s32
i2c_smbus_read_word_swapped(file, command)
int file
__u8 command
CODE:
__s32 rval = i2c_smbus_read_word_data(file, command );
RETVAL = (rval < 0) ? rval : __swab16(rval);
OUTPUT: RETVAL
__s32
i2c_smbus_write_word_swapped( file, command, value)
int file
__u8 command
__u16 value
CODE:
RETVAL = i2c_smbus_write_word_data(file, command, __swab16(value) );
OUTPUT: RETVAL
__s32
i2c_smbus_process_call( file, command, value )
int file
__u8 command
__u16 value
CODE:
RETVAL = i2c_smbus_process_call(file, command, value );
OUTPUT: RETVAL
void
i2c_smbus_read_block_data( file, command )
int file
__u8 command
PPCODE:
int i;
__u8 buf[32];
int result = i2c_smbus_read_block_data(file, command, buf);
if (result < 0) {
EXTEND( SP, 1 );
PUSHs( &PL_sv_undef );
} else {
EXTEND( SP, (IV)result );
for( i = 0; i < result; ++i )
{
SV* var = sv_newmortal();
sv_setuv( var, (UV)buf[i] );
PUSHs( var );
}
}
void
i2c_smbus_read_i2c_block_data( file, command, len )
int file
__u8 command
__u8 len
PPCODE:
int i;
__u8 *buffer;
buffer = malloc(len * sizeof(__u8));
int result = i2c_smbus_read_i2c_block_data(file, command, len, buffer);
if (result < 0) {
EXTEND( SP, 1 );
PUSHs( &PL_sv_undef );
} else {
EXTEND( SP, (IV)result );
for( i = 0; i < result; ++i )
{
SV* var = sv_newmortal();
sv_setuv( var, (UV)buffer[i] );
PUSHs( var );
}
}
free( buffer );
__s32
i2c_smbus_write_block_data( file, command, dataarray )
int file
__u8 command
SV* dataarray
CODE:
STRLEN len;
AV* av;
__u8 *buffer;
int i;
if( !SvROK( dataarray ) || ( SvTYPE( (SV*) ( av = (AV*) SvRV( dataarray ) ) ) != SVt_PVAV ) )
{
croak( "the data array is not an array reference" );
return;
}
len = av_len( av ) + 1;
buffer = malloc(len * sizeof(__u8));
for( i = 0; i < (int)len; ++i )
buffer[i] = (__u8)SvUV(*av_fetch( av, i, 0 ));
RETVAL = i2c_smbus_write_block_data(file, command, len, buffer);
free( buffer);
OUTPUT: RETVAL
__s32
i2c_smbus_write_i2c_block_data( file, command, dataarray )
int file
__u8 command
SV* dataarray
CODE:
STRLEN len;
AV* av;
__u8 *buffer;
int i;
if( !SvROK( dataarray ) || ( SvTYPE( (SV*) ( av = (AV*) SvRV( dataarray ) ) ) != SVt_PVAV ) )
{
croak( "the data array is not an array reference" );
return;
}
len = av_len( av ) + 1;
buffer = malloc(len * sizeof(__u8));
for( i = 0; i < (int)len; ++i )
buffer[i] = (__u8)SvUV(*av_fetch( av, i, 0 ));
RETVAL = i2c_smbus_write_i2c_block_data(file, command, len, buffer);
free( buffer );
OUTPUT: RETVAL
int
_i2c_write( int file, __u16 address, unsigned char *wbuf, __u16 wlen )
CODE:
int ret;
struct i2c_rdwr_ioctl_data i2c_data;
struct i2c_msg msg[1];
i2c_data.msgs = msg;
i2c_data.nmsgs = 1; // use one message structure
i2c_data.msgs[0].addr = address;
i2c_data.msgs[0].flags = 0; // don't need flags
i2c_data.msgs[0].len = wlen;
i2c_data.msgs[0].buf = (__u8 *)wbuf;
ret = ioctl(file, I2C_RDWR, &i2c_data);
if (ret < 0) {
RETVAL = ret;
} else {
RETVAL = 0;
}
OUTPUT: RETVAL
int
_i2c_read( int file, __u16 address, unsigned char *rbuf, __u16 rlen)
CODE:
int ret;
struct i2c_rdwr_ioctl_data i2c_data;
struct i2c_msg msg[1];
i2c_data.msgs = msg;
i2c_data.nmsgs = 1;
i2c_data.msgs[0].addr = address;
i2c_data.msgs[0].flags = I2C_M_RD;
i2c_data.msgs[0].len = rlen;
i2c_data.msgs[0].buf = (__u8 *)rbuf;
ret = ioctl(file, I2C_RDWR, &i2c_data);
if (ret < 0) {
RETVAL = ret;
} else {
RETVAL = 0;
}
OUTPUT: RETVAL
int
_i2c_read_register( int file, __u16 address, unsigned char *wbuf, unsigned char *rbuf, __u16 rlen)
CODE:
int ret;
struct i2c_rdwr_ioctl_data i2c_data;
struct i2c_msg msg[2];
i2c_data.msgs = msg;
i2c_data.nmsgs = 2;
i2c_data.msgs[0].addr = address;
i2c_data.msgs[0].flags = 0;
i2c_data.msgs[0].len = 1;
i2c_data.msgs[0].buf = (__u8 *)wbuf;
i2c_data.msgs[1].addr = address;
i2c_data.msgs[1].flags = I2C_M_RD;
i2c_data.msgs[1].len = rlen;
i2c_data.msgs[1].buf = (__u8 *)rbuf;
ret = ioctl(file, I2C_RDWR, &i2c_data);
if (ret < 0) {
RETVAL = ret;
} else {
RETVAL = 0;
}
OUTPUT: RETVAL
void
i2c_scan_bus( file, mode = SCAN_MODE_AUTO, first = 0x03, last = 0x77 )
int file
int mode
int first
int last
PPCODE:
int i;
int j;
int res;
for (i = 0; i < 128; i += 16) {
for(j = 0; j < 16; j++) {
res = -1;
/* Skip unwanted addresses */
if (i+j < first || i+j > last) {
continue;
}
/* Set slave address */
if (ioctl(file, I2C_SLAVE, i+j) < 0) {
continue;
}
/* Probe this address */
switch (mode) {
case SCAN_MODE_QUICK:
res = i2c_smbus_write_quick(file, I2C_SMBUS_WRITE);
break;
case SCAN_MODE_READ:
res = i2c_smbus_read_byte(file);
break;
default:
if ((i+j >= 0x30 && i+j <= 0x37) || (i+j >= 0x50 && i+j <= 0x5F)) {
res = i2c_smbus_read_byte(file);
} else {
res = i2c_smbus_write_quick(file, I2C_SMBUS_WRITE );
}
}
if (res >= 0) {
EXTEND( SP, 1 );
SV* var = sv_newmortal();
sv_setuv( var, (UV)(i + j) );
PUSHs( var );
}
}
}
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