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#include <minix/i2c.h>
#include <minix/com.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "eepromread.h"
static int __eeprom_read128(int fd, i2c_addr_t addr, uint16_t memaddr,
void *buf, size_t buflen, int flags, enum device_types device_type);
static int eeprom_dump(int fd, i2c_addr_t addr, int flags,
enum device_types device_type);
#define DEFAULT_I2C_DEVICE "/dev/i2c-1"
#define DEFAULT_I2C_ADDRESS 0x50
/*
* The /dev interface only supports 128 byte reads/writes and the EEPROM is
* larger, so to read the whole EEPROM, the task is broken down into 128 byte
* chunks in eeprom_read(). __eeprom_read128() does the actual ioctl() to do
* the read.
*/
static int
__eeprom_read128(int fd, i2c_addr_t addr, uint16_t memaddr, void *buf,
size_t buflen, int flags, enum device_types device_type)
{
int r;
minix_i2c_ioctl_exec_t ioctl_exec;
if (buflen > I2C_EXEC_MAX_BUFLEN || buf == NULL
|| ((memaddr + buflen) < memaddr)) {
errno = EINVAL;
return -1;
}
/* if /dev/eeprom, then use read() */
if (device_type == EEPROM_DEVICE) {
off_t offset;
offset = lseek(fd, memaddr, SEEK_SET);
if (offset != memaddr) {
return -1;
}
return read(fd, buf, buflen);
}
/* else /dev/i2c, use i2c_ioctl_exec_t interface */
memset(&ioctl_exec, '\0', sizeof(minix_i2c_ioctl_exec_t));
ioctl_exec.iie_op = I2C_OP_READ_WITH_STOP;
ioctl_exec.iie_addr = addr;
/* set the address to read from */
if ((BDEV_NOPAGE & flags) == BDEV_NOPAGE) {
/* reading within the current page */
ioctl_exec.iie_cmd[0] = (memaddr & 0xff);
ioctl_exec.iie_cmdlen = 1;
} else {
/* reading from device with multiple pages */
ioctl_exec.iie_cmd[0] = ((memaddr >> 8) & 0xff);
ioctl_exec.iie_cmd[1] = (memaddr & 0xff);
ioctl_exec.iie_cmdlen = 2;
}
ioctl_exec.iie_buflen = buflen;
r = ioctl(fd, MINIX_I2C_IOCTL_EXEC, &ioctl_exec);
if (r == -1) {
return -1;
}
/* call was good, copy results to caller's buffer */
memcpy(buf, ioctl_exec.iie_buf, buflen);
return 0;
}
int
eeprom_read(int fd, i2c_addr_t addr, uint16_t memaddr, void *buf,
size_t buflen, int flags, enum device_types device_type)
{
int r;
uint16_t i;
if (buf == NULL || ((memaddr + buflen) < memaddr)) {
errno = EINVAL;
return -1;
}
for (i = 0; i < buflen; i += 128) {
r = __eeprom_read128(fd, addr, memaddr + i, buf + i,
((buflen - i) < 128) ? (buflen - i) : 128, flags,
device_type);
if (r == -1) {
return -1;
}
}
return 0;
}
/*
* Read 256 bytes and print it to the screen in HEX and ASCII.
*/
static int
eeprom_dump(int fd, i2c_addr_t addr, int flags, enum device_types device_type)
{
int i, j, r;
uint8_t buf[256];
memset(buf, '\0', 256);
r = eeprom_read(fd, addr, 0x0000, buf, 256, flags, device_type);
if (r == -1) {
return r;
}
/* print table header */
for (i = 0; i < 2; i++) {
printf(" ");
for (j = 0x0; j <= 0xf; j++) {
if (i == 0) {
printf(" ");
}
printf("%x", j);
}
}
printf("\n");
/* print table data */
for (i = 0x00; i < 0xff; i += 0x10) {
/* row label */
printf("%02x:", i);
/* row data (in hex) */
for (j = 0x0; j <= 0xf; j++) {
printf(" %02x", buf[i + j]);
}
printf(" ");
/* row data (in ASCII) */
for (j = 0x0; j <= 0xf; j++) {
if (isprint(buf[i + j])) {
printf("%c", buf[i + j]);
} else {
printf(".");
}
}
printf("\n");
}
return 0;
}
int
main(int argc, char *argv[])
{
int r, fd;
int ch, iflag = 0, read_flags = 0;
char *device = DEFAULT_I2C_DEVICE;
i2c_addr_t address = DEFAULT_I2C_ADDRESS;
enum device_types device_type = DEFAULT_DEVICE;
setprogname(*argv);
while ((ch = getopt(argc, argv, "a:f:in")) != -1) {
switch (ch) {
case 'a':
address = strtol(optarg, NULL, 0x10);
break;
case 'f':
device = optarg;
break;
case 'i':
iflag = 1;
break;
case 'n':
read_flags |= BDEV_NOPAGE;
break;
default:
break;
}
}
/* determine whether to use /dev/i2c or /dev/eeprom interface */
device_type =
strstr(device, "i2c") == NULL ? EEPROM_DEVICE : I2C_DEVICE;
fd = open(device, O_RDWR);
if (fd == -1) {
fprintf(stderr, "open(): %s\n", strerror(errno));
return 1;
}
if (iflag == 1) {
r = board_info(fd, address, read_flags, device_type);
if (r == -1) {
fprintf(stderr, "board_info(): %s\n", strerror(errno));
return 1;
}
} else {
r = eeprom_dump(fd, address, read_flags, device_type);
if (r == -1) {
fprintf(stderr, "eeprom_dump(): %s\n",
strerror(errno));
return 1;
}
}
r = close(fd);
if (r == -1) {
fprintf(stderr, "close(): %s\n", strerror(errno));
return 1;
}
return 0;
}
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