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/* ======================================================================= *//**
* @Component OMAPCONF
* @Filename i2cset.c
* @Description A user-space program to write an I2C register.
* @Copyright GPL
*//*======================================================================== */
/*
i2cset.c - A user-space program to write an I2C register.
Copyright (C) 2001-2003 Frodo Looijaard <frodol@dds.nl>, and
Mark D. Studebaker <mdsxyz123@yahoo.com>
Copyright (C) 2004-2008 Jean Delvare <khali@linux-fr.org>

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; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA.
*/

#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <i2c-dev.h>
#include <i2cbusses.h>
#include <util.h>
#include <version.h>

static void help(void) __attribute__ ((noreturn));

static void help(void)
{
fprintf(stderr,
"Usage: i2cset [-f] [-y] [-m MASK] "\
"I2CBUS CHIP-ADDRESS DATA-ADDRESS [VALUE [MODE]]\n"
" I2CBUS is an integer or an I2C bus name\n"
" ADDRESS is an integer (0x03 - 0x77)\n"
" MODE is one of:\n"
" b (byte, default)\n"
" w (word)\n"
" Append p for SMBus PEC\n");
exit(1);
}

static int check_funcs(int file, int size, int pec)
{
unsigned long funcs;

/* check adapter functionality */
if (ioctl(file, I2C_FUNCS, &funcs) < 0) {
fprintf(stderr, "Error: Could not get the adapter "
"functionality matrix: %s\n", strerror(errno));
return -1;
}

switch (size) {
case I2C_SMBUS_BYTE:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus send byte");
return -1;
}
break;

case I2C_SMBUS_BYTE_DATA:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus write byte");
return -1;
}
break;

case I2C_SMBUS_WORD_DATA:
if (!(funcs & I2C_FUNC_SMBUS_WRITE_WORD_DATA)) {
fprintf(stderr, MISSING_FUNC_FMT, "SMBus write word");
return -1;
}
break;
}

if (pec
&& !(funcs & (I2C_FUNC_SMBUS_PEC | I2C_FUNC_I2C))) {
fprintf(stderr, "Warning: Adapter does "
"not seem to support PEC\n");
}

return 0;
}

static int confirm(const char *filename, int address, int size, int daddress,
int value, int vmask, int pec)
{
int dont = 0;

fprintf(stderr, "WARNING! This program can confuse your I2C "
"bus, cause data loss and worse!\n");

if (address >= 0x50 && address <= 0x57) {
fprintf(stderr, "DANGEROUS! Writing to a serial "
"EEPROM on a memory DIMM\nmay render your "
"memory USELESS and make your system "
"UNBOOTABLE!\n");
dont++;
}

fprintf(stderr, "I will write to device file %s, chip address "
"0x%02x, data address\n0x%02x, ", filename, address, daddress);
if (size == I2C_SMBUS_BYTE)
fprintf(stderr, "no data.\n");
else
fprintf(stderr, "data 0x%02x%s, mode %s.\n", value,
vmask ? " (masked)" : "",
size == I2C_SMBUS_BYTE_DATA ? "byte" : "word");
if (pec)
fprintf(stderr, "PEC checking enabled.\n");

fprintf(stderr, "Continue? [%s] ", dont ? "y/N" : "Y/n");
fflush(stderr);
if (!user_ack(!dont)) {
fprintf(stderr, "Aborting on user request.\n");
return 0;
}

return 1;
}

int main_i2cset(int argc, char *argv[])
{
char *end;
const char *maskp = NULL;
int res, i2cbus, address, size, file;
int value, daddress, vmask = 0;
char filename[20];
int pec = 0;
int flags = 0;
int force = 0, yes = 0, version = 0, readback = 0;
int index, loopcount = 1;

/* handle (optional) flags first */
while (1+flags < argc && argv[1+flags][0] == '-') {
switch (argv[1+flags][1]) {
case 'V': version = 1; break;
case 'f': force = 1; break;
case 'y': yes = 1; break;
case 'm':
if (2+flags < argc)
maskp = argv[2+flags];
flags++;
break;
case 'r': readback = 1; break;
default:
fprintf(stderr, "Error: Unsupported option "
"\"%s\"!\n", argv[1+flags]);
help();
exit(1);
}
flags++;
}

if (version) {
fprintf(stderr, "i2cset version %s\n", VERSION);
exit(0);
}

if (argc < flags + 4)
help();

i2cbus = lookup_i2c_bus(argv[flags+1]);
if (i2cbus < 0)
help();

address = parse_i2c_address(argv[flags+2]);
if (address < 0)
help();

daddress = strtol(argv[flags+3], &end, 0);
if (*end || daddress < 0 || daddress > 0xff) {
fprintf(stderr, "Error: Data address invalid!\n");
help();
}

if (argc > flags + 4) {
size = I2C_SMBUS_BYTE_DATA;
value = strtol(argv[flags+4], &end, 0);
if (*end || value < 0) {
fprintf(stderr, "Error: Data value invalid!\n");
help();
}
} else {
size = I2C_SMBUS_BYTE;
value = -1;
}

if (argc > flags + 5) {
switch (argv[flags+5][0]) {
case 'b': size = I2C_SMBUS_BYTE_DATA; break;
case 'w': size = I2C_SMBUS_WORD_DATA; break;
default:
fprintf(stderr, "Error: Invalid mode!\n");
help();
}
pec = argv[flags+5][1] == 'p';
}

/* Old method to provide the value mask, deprecated and no longer
documented but still supported for compatibility */
if (argc > flags + 6) {
if (maskp) {
fprintf(stderr, "Error: Data value mask provided twice!\n");
help();
}
fprintf(stderr, "Warning: Using deprecated way to set the data value mask!\n");
fprintf(stderr, " Please switch to using -m.\n");
maskp = argv[flags+6];
}
if (argc > flags + 7)
loopcount = strtol(argv[flags+7], &end, 0);
if (*end || loopcount < 1) {
fprintf(stderr, "Error: Loop Count invalid!\n");
help();
}

if (maskp) {
vmask = strtol(maskp, &end, 0);
if (*end || vmask == 0) {
fprintf(stderr, "Error: Data value mask invalid!\n");
help();
}
}

if ((size == I2C_SMBUS_BYTE_DATA && value > 0xff)
|| (size == I2C_SMBUS_WORD_DATA && value > 0xffff)) {
fprintf(stderr, "Error: Data value out of range!\n");
help();
}

file = open_i2c_dev(i2cbus, filename, 0);
if (file < 0
|| check_funcs(file, size, pec)
|| set_slave_addr(file, address, force))
exit(1);

if (!yes && !confirm(filename, address, size, daddress,
value, vmask, pec))
exit(0);

if (vmask) {
int oldvalue;

switch (size) {
case I2C_SMBUS_BYTE:
oldvalue = i2c_smbus_read_byte(file);
break;
case I2C_SMBUS_WORD_DATA:
oldvalue = i2c_smbus_read_word_data(file, daddress);
break;
default:
oldvalue = i2c_smbus_read_byte_data(file, daddress);
}

if (oldvalue < 0) {
fprintf(stderr, "Error: Failed to read old value\n");
exit(1);
}

value = (value & vmask) | (oldvalue & ~vmask);

if (!yes) {
fprintf(stderr, "Old value 0x%0*x, write mask "
"0x%0*x: Will write 0x%0*x to register "
"0x%02x\n",
size == I2C_SMBUS_WORD_DATA ? 4 : 2, oldvalue,
size == I2C_SMBUS_WORD_DATA ? 4 : 2, vmask,
size == I2C_SMBUS_WORD_DATA ? 4 : 2, value,
daddress);

fprintf(stderr, "Continue? [Y/n] ");
fflush(stderr);
if (!user_ack(1)) {
fprintf(stderr, "Aborting on user request.\n");
exit(0);
}
}
}

if (pec && ioctl(file, I2C_PEC, 1) < 0) {
fprintf(stderr, "Error: Could not set PEC: %s\n",
strerror(errno));
close(file);
exit(1);
}
for (index = 0; index < loopcount; index++) {
switch (size) {
case I2C_SMBUS_BYTE:
res = i2c_smbus_write_byte(file, daddress);
break;
case I2C_SMBUS_WORD_DATA:
res = i2c_smbus_write_word_data(file, daddress, value);
break;
default: /* I2C_SMBUS_BYTE_DATA */
res = i2c_smbus_write_byte_data(file, daddress, value);
}
if (res < 0) {
fprintf(stderr, "Error: Write failed\n");
close(file);
exit(1);
}

if (pec) {
if (ioctl(file, I2C_PEC, 0) < 0) {
fprintf(stderr, "Error: Could not clear PEC: %s\n",
strerror(errno));
close(file);
exit(1);
}
}

if (!readback) {
/* We're done */
close(file);
exit(0);
}

switch (size) {
case I2C_SMBUS_BYTE:
res = i2c_smbus_read_byte(file);
value = daddress;
break;
case I2C_SMBUS_WORD_DATA:
res = i2c_smbus_read_word_data(file, daddress);
break;
default: /* I2C_SMBUS_BYTE_DATA */
res = i2c_smbus_read_byte_data(file, daddress);
}

if (res < 0)
printf("Warning - readback failed\n");
else
if (res != value) {
printf("Warning - data mismatch - wrote "
"0x%0*x, read back 0x%0*x\n",
size == I2C_SMBUS_WORD_DATA ? 4 : 2, value,
size == I2C_SMBUS_WORD_DATA ? 4 : 2, res);
} else {
printf("Value 0x%0*x written, readback matched\n",
size == I2C_SMBUS_WORD_DATA ? 4 : 2, value);
}

}
close(file);
exit(0);
}


/**
* Function: i2cset
* Role: write given data at given address of given device of given I2C bus
* Parameters:
* i2cbus: I2C bus number
* address: I2C device address
* daddress: I2C device register address
* data: data to be written
* Return:
* 0 in case of success
* -1 in case of incorrect argument
* -8 in case of i2c dev cannot be opened
* -4 in case of I2C read error
*/
int i2cset(
unsigned int i2cbus, unsigned int address, unsigned int daddress,
unsigned int data)
{
int res, file;
char filename[20];

if (i2cbus > 0xFF) {
printf("Error: I2C bus out of range (0-255)!\n");
return -1;
}

if (address > 0xFF) {
printf("Error: Chip address invalid!\n");
return -1;
}

if (daddress > 0xFF) {
printf("Error: Data address invalid!\n");
return -1;
}

if (data > 0xFF) {
printf("Error: Data invalid!\n");
return -1;
}

file = open_i2c_dev(i2cbus, filename, 1);
if (file < 0
|| check_funcs(file, I2C_SMBUS_BYTE_DATA, 0)
|| set_slave_addr(file, address, 1))
return -8;

res = i2c_smbus_write_byte_data(file, daddress, data);
if (res < 0) {
fprintf(stderr, "Error: Write failed!\n");
close(file);
return -4;
}

res = i2c_smbus_read_byte_data(file, daddress);
close(file);
if (res < 0) {
printf("Warning - readback failed\n");
return -4;
} else {
if (res != (int) data) {
printf("Warning - data mismatch - wrote "
"0x%02x, read back 0x%02x\n", data, res);
return -4;
} else {
return 0;
}
}
}


/**
* Function: i2cset_word
* Role: write given data at given address of given device of given I2C bus
* Parameters:
* i2cbus: I2C bus number
* address: I2C device address
* daddress: I2C device register address
* data: data to be written
* Return:
* 0 in case of success
* -1 in case of incorrect argument
* -8 in case of i2c dev cannot be opened
* -4 in case of I2C read error
*/
int i2cset_word(
unsigned int i2cbus, unsigned int address, unsigned int daddress,
unsigned int data)
{
int res, file;
char filename[20];

if (i2cbus > 0xFF) {
printf("Error: I2C bus out of range (0-255)!\n");
return -1;
}

if (address > 0xFF) {
printf("Error: Chip address invalid!\n");
return -1;
}

if (daddress > 0xFF) {
printf("Error: Data address invalid!\n");
return -1;
}

if (data > 0xFFFF) {
printf("Error: Data invalid!\n");
return -1;
}

file = open_i2c_dev(i2cbus, filename, 1);
if (file < 0
|| check_funcs(file, I2C_SMBUS_WORD_DATA, 0)
|| set_slave_addr(file, address, 1))
return -8;

res = i2c_smbus_write_word_data(file, daddress, data);
if (res < 0) {
fprintf(stderr, "Error: Write failed!\n");
close(file);
return -4;
}

res = i2c_smbus_read_word_data(file, daddress);
close(file);
if (res < 0) {
printf("Warning - readback failed\n");
return -4;
} else {
if (res != (int) data) {
printf("Warning - data mismatch - wrote "
"0x%02x, read back 0x%02x\n", data, res);
return -4;
} else {
return 0;
}
}
}
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