mirror of
https://github.com/lm-sensors/lm-sensors
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d9927a5a5e
Only use PEC on the register write, not the readback, as it has proven to cause trouble on some chips. Reads with PEC can be tested using i2cget. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3109 7894878c-1315-0410-8ee3-d5d059ff63e0
295 lines
7.5 KiB
C
295 lines
7.5 KiB
C
/*
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i2cset.c - A user-space program to write an I2C register.
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Copyright (C) 2001-2003 Frodo Looijaard <frodol@dds.nl>, and
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Copyright (C) 2004-2005 Jean Delvare <khali@linux-fr.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "i2cbusses.h"
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#include "i2c-dev.h"
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#include "version.h"
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void help(void) __attribute__ ((noreturn));
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void help(void)
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{
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fprintf(stderr, "Syntax: i2cset [-y] I2CBUS CHIP-ADDRESS DATA-ADDRESS "
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"VALUE [MODE] [MASK]\n"
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" i2cset -V\n"
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" MODE is 'b[yte]' or 'w[ord]' (default b)\n"
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" Append 'p' to MODE for PEC checking\n"
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" I2CBUS is an integer\n");
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print_i2c_busses(0);
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exit(1);
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}
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int main(int argc, char *argv[])
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{
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char *end;
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int res, i2cbus, address, size, file;
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int value, daddress, vmask = 0;
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int e1;
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char filename[20];
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long funcs;
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int pec = 0;
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int flags = 0;
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int yes = 0, version = 0;
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/* handle (optional) flags first */
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while (1+flags < argc && argv[1+flags][0] == '-') {
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switch (argv[1+flags][1]) {
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case 'V': version = 1; break;
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case 'y': yes = 1; break;
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default:
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fprintf(stderr, "Warning: Unsupported flag "
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"\"-%c\"!\n", argv[1+flags][1]);
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help();
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exit(1);
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}
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flags++;
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}
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if (version) {
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fprintf(stderr, "i2cset version %s\n", LM_VERSION);
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exit(0);
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}
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if (argc < flags + 5)
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help();
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i2cbus = strtol(argv[flags+1], &end, 0);
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if (*end || i2cbus < 0 || i2cbus > 0x3f) {
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fprintf(stderr, "Error: I2CBUS argument invalid!\n");
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help();
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}
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address = strtol(argv[flags+2], &end, 0);
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if (*end || address < 0 || address > 0x7f) {
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fprintf(stderr, "Error: Chip address invalid!\n");
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help();
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}
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daddress = strtol(argv[flags+3], &end, 0);
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if (*end || daddress < 0 || daddress > 0xff) {
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fprintf(stderr, "Error: Data address invalid!\n");
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help();
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}
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value = strtol(argv[flags+4], &end, 0);
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if (*end) {
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fprintf(stderr, "Error: Data value invalid!\n");
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help();
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}
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if (argc < flags + 6) {
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fprintf(stderr, "No size specified (using byte-data access)\n");
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size = I2C_SMBUS_BYTE_DATA;
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} else if (argv[flags+5][0] == 'b') {
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size = I2C_SMBUS_BYTE_DATA;
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pec = argv[flags+5][1] == 'p';
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} else if (argv[flags+5][0] == 'w') {
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size = I2C_SMBUS_WORD_DATA;
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pec = argv[flags+5][1] == 'p';
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} else {
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fprintf(stderr, "Error: Invalid mode!\n");
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help();
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}
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if (argc >= flags + 7) {
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vmask = strtol(argv[flags+6], &end, 0);
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if (*end || vmask == 0) {
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fprintf(stderr, "Error: Data value mask invalid!\n");
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help();
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}
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}
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if (value < 0
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|| (size == I2C_SMBUS_BYTE_DATA && value > 0xff)
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|| (size == I2C_SMBUS_WORD_DATA && value > 0xffff)) {
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fprintf(stderr, "Error: Data value out of range!\n");
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help();
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}
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file = open_i2c_dev(i2cbus, filename, 0);
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if (file < 0) {
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exit(1);
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}
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/* check adapter functionality */
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if (ioctl(file, I2C_FUNCS, &funcs) < 0) {
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fprintf(stderr, "Error: Could not get the adapter "
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"functionality matrix: %s\n", strerror(errno));
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exit(1);
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}
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switch (size) {
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case I2C_SMBUS_BYTE_DATA:
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if (!(funcs & I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
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fprintf(stderr, "Error: Adapter for i2c bus %d does "
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"not have byte write capability\n", i2cbus);
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exit(1);
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}
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break;
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case I2C_SMBUS_WORD_DATA:
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if (!(funcs & I2C_FUNC_SMBUS_WRITE_WORD_DATA)) {
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fprintf(stderr, "Error: Adapter for i2c bus %d does "
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"not have word write capability\n", i2cbus);
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exit(1);
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}
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break;
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}
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/* use FORCE so that we can write registers even when
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a driver is also running */
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if (ioctl(file, I2C_SLAVE_FORCE, address) < 0) {
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fprintf(stderr, "Error: Could not set address to %d: %s\n",
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address, strerror(errno));
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exit(1);
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}
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if (!yes) {
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char s[2];
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int dont = 0;
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fprintf(stderr, "WARNING! This program can confuse your I2C "
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"bus, cause data loss and worse!\n");
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if (address >= 0x50 && address <= 0x57) {
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fprintf(stderr, "DANGEROUS! Writing to a serial "
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"EEPROM on a memory DIMM\nmay render your "
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"memory USELESS and make your system "
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"UNBOOTABLE!\n");
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dont = 1;
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}
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fprintf(stderr, "I will write to device file %s, chip address "
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"0x%02x, data address\n0x%02x, data 0x%02x%s, mode "
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"%s.\n", filename, address, daddress, value,
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vmask ? " (masked)" : "",
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size == I2C_SMBUS_BYTE_DATA ? "byte" : "word");
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if (pec)
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fprintf(stderr, "PEC checking enabled.\n");
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fprintf(stderr, "Continue? [%s] ", dont ? "y/N" : "Y/n");
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fflush(stderr);
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fgets(s, 2, stdin);
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if ((s[0] != '\n' || dont) && s[0] != 'y' && s[0] != 'Y') {
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fprintf(stderr, "Aborting on user request.\n");
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exit(0);
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}
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}
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if (vmask) {
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int oldvalue;
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if (size == I2C_SMBUS_WORD_DATA) {
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oldvalue = i2c_smbus_read_word_data(file, daddress);
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} else {
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oldvalue = i2c_smbus_read_byte_data(file, daddress);
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}
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if (oldvalue < 0) {
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fprintf(stderr, "Error: Failed to read old value\n");
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exit(1);
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}
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value = (value & vmask) | (oldvalue & ~vmask);
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if (!yes) {
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char s[2];
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fprintf(stderr, "Old value 0x%0*x, write mask "
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"0x%0*x: Will write 0x%0*x to register "
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"0x%02x\n",
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size == I2C_SMBUS_WORD_DATA ? 4 : 2, oldvalue,
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size == I2C_SMBUS_WORD_DATA ? 4 : 2, vmask,
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size == I2C_SMBUS_WORD_DATA ? 4 : 2, value,
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daddress);
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fprintf(stderr, "Continue? [Y/n] ");
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fflush(stderr);
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fgets(s, 2, stdin);
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if (s[0] != '\n' && s[0] != 'y' && s[0] != 'Y') {
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fprintf(stderr, "Aborting on user request.\n");
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exit(0);
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}
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}
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}
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if (pec) {
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if (ioctl(file, I2C_PEC, 1) < 0) {
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fprintf(stderr, "Error: Could not set PEC: %s\n",
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strerror(errno));
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exit(1);
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}
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if (!(funcs & (I2C_FUNC_SMBUS_HWPEC_CALC | I2C_FUNC_I2C))) {
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fprintf(stderr, "Warning: Adapter for i2c bus %d does "
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"not seem to actually support PEC\n", i2cbus);
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}
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}
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e1 = 0;
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if (size == I2C_SMBUS_WORD_DATA) {
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res = i2c_smbus_write_word_data(file, daddress, value);
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} else {
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res = i2c_smbus_write_byte_data(file, daddress, value);
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}
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if (res < 0) {
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fprintf(stderr, "Warning - write failed\n");
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e1++;
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}
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if (pec) {
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if (ioctl(file, I2C_PEC, 0) < 0) {
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fprintf(stderr, "Error: Could not clear PEC: %s\n",
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strerror(errno));
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close(file);
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exit(e1);
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}
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}
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if (size == I2C_SMBUS_WORD_DATA) {
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res = i2c_smbus_read_word_data(file, daddress);
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} else {
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res = i2c_smbus_read_byte_data(file, daddress);
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}
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close(file);
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if (res < 0) {
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fprintf(stderr, "Warning - readback failed\n");
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e1++;
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} else
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if (res != value) {
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e1++;
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fprintf(stderr, "Warning - data mismatch - wrote "
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"0x%0*x, read back 0x%0*x\n",
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size == I2C_SMBUS_WORD_DATA ? 4 : 2, value,
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size == I2C_SMBUS_WORD_DATA ? 4 : 2, res);
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} else {
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fprintf(stderr, "Value 0x%0*x written, readback matched\n",
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size == I2C_SMBUS_WORD_DATA ? 4 : 2, value);
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}
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exit(e1);
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}
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