Re: New I2C and machine probing method
On Sun, 16 Jul 2006 15:45:57 +0200
Matthias Grimm <matthiasgrimm@users.sourceforge.net> wrote:
Thanks a lot for your support so far. I put the new knowledge into a
revised program and attached it again. Changes are:
- There are two known locations for the lmu-controller in the
device-tree so far. Both are supported now.
- adding I/O error support. To communicate with the LMU the program
must be run as root. If there was any problem with the device, an
I/O error message would occur on terminal.
- removing all the silly warnings
- detailed machine identification by name added
I hope you give it another try :-)
Best Regards
Matthias
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#define OFBASE "./device-tree"
#define SYSI2CDEV "/sys/class/i2c-dev"
#define I2CCHIP "uni-n"
#define I2C_SLAVE 0x0703
#define OHARE_PMU 9
static char *machines[7][10] = {
{ "unknown",
"PowerBook 3400", /* 0,1 */
"PowerBook 3500", /* 0,2 */
"PowerBook Wallstreet (Apr 1998)", /* 0,3 */
NULL, NULL, NULL, NULL, NULL, NULL },
{ NULL,
"PowerBook 101 Lombard (Apr 1999)", /* 1,1 */
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ NULL,
"iBook (Feb 2000)", /* 2,1 */
"iBook FireWire (Sep 2000)", /* 2,2 */
NULL, NULL, NULL, NULL, NULL, NULL, NULL },
{ NULL,
"PowerBook G3 Pismo (Feb 2000)", /* 3,1 */
"PowerBook G4 Titanium (Dec 2000)", /* 3,2 */
"PowerBook G4 Titanium II (Oct 2001)", /* 3,3 */
"PowerBook G4 Titanium III (Apr 2002)", /* 3,4 */
"PowerBook G4 Titanium IV (Nov 2002)", /* 3,5 */
NULL, NULL, NULL, NULL },
{ NULL,
"iBook 2 (May 2001)", /* 4,1 */
"iBook 2 (May 2002)", /* 4,2 */
"iBook 2 rev. 2 (Nov 2002)", /* 4,3 */
NULL, NULL, NULL, NULL, NULL, NULL },
{ NULL,
"PowerBook G4 17\" (Mar 2003)", /* 5,1 */
"PowerBook G4 15\" (Sep 2003)", /* 5,2 */
"PowerBook G4 17\" (Sep 2003)", /* 5,3 */
"PowerBook G4 15\" (Apr 2004)", /* 5,4 */
"PowerBook G4 17\" (Apr 2004)", /* 5,5 */
"PowerBook G4 15\" (Feb 2005)", /* 5,6 */
"PowerBook G4 17\" (Feb 2005)", /* 5,7 */
"PowerBook G4 15\" (Oct 2005)", /* 5,8 */
"PowerBook G4 17\" (Oct 2005)" }, /* 5,9 */
{ NULL,
"PowerBook G4 12\" (Jan 2003)", /* 6,1 */
"PowerBook G4 12\" (Sep 2003)", /* 6,2 */
"iBook G4 (Oct 2003)", /* 6,3 */
"PowerBook G4 12\" (Apr 2004)", /* 6,4 */
"iBook G4 (Apr 2004)", /* 6,5 */
NULL,
"iBook G4 (Jul 2005)", /* 6,7 */
"PowerBook G4 12\" (Oct 2005)", /* 6,8 */
NULL }
};
int
probeLMU(char *device, int addr)
{
char buffer[4];
int fd, rc = 0;
if ((fd = open(device, O_RDWR)) >= 0) {
if (ioctl(fd, I2C_SLAVE, addr) >= 0) {
if (read (fd, buffer, 4) == 4)
rc = 1;
}
close(fd);
} else
printf (" %s!", strerror(errno));
return rc;
}
int
addPath(char *path, int maxlen, char *pattern)
{
DIR *dh;
struct dirent *dir;
int rc = 1;
if ((dh = opendir(path))) {
while ((dir = readdir(dh))) {
if ((strncmp(dir->d_name, pattern, strlen(pattern)) == 0)) {
strncat(path, "/", maxlen-1);
strncat(path, dir->d_name, maxlen-1);
rc = 0;
break;
}
}
closedir(dh);
}
return rc;
}
int
getLMUAddress()
{
char path[200];
long reg;
int fd, n, rc = 0, err = 0;
path[0] = 0; /* terminate path buffer */
strncat(path, OFBASE, sizeof(path)-1);
if ((err = addPath(path, sizeof(path), "uni-n")) == 0)
if ((err = addPath(path, sizeof(path), "i2c")) == 0)
if ((err = addPath(path, sizeof(path), "lmu-controller")) != 0)
if ((err = addPath(path, sizeof(path), "i2c-bus")) == 0)
err = addPath(path, sizeof(path), "lmu-micro");
strncat(path, "/reg", sizeof(path)-1);
printf(" OF: '%s'\n", path);
if (err > 0)
printf(" Path incomplete! One or more elements not found.\n");
else if ((fd = open(path, O_RDONLY)) >= 0) {
n = read(fd, ®, sizeof(long));
if (n == sizeof(long))
rc = (int) (reg >> 1);
close(fd);
}
return rc;
}
int
findI2CDevice(int addr)
{
char buffer[40];
DIR *dh;
struct dirent *dir;
unsigned int n;
int fd;
if ((dh = opendir(SYSI2CDEV))) {
while ((dir = readdir(dh))) {
if (dir->d_name[0] == '.') continue;
snprintf(buffer, sizeof(buffer), SYSI2CDEV"/%s/name", dir->d_name);
if ((fd = open(buffer, O_RDONLY)) >= 0) {
n = read(fd, buffer, sizeof(buffer));
if (n > 0 && n < sizeof(buffer)) {
buffer[n-1] = 0;
printf(" I2C: '%s', '%s'", dir->d_name, buffer);
if ((strncmp(I2CCHIP" ", buffer, 6) == 0)) {
snprintf(buffer, sizeof(buffer), "/dev/%s", dir->d_name);
printf(" probing %s ...", buffer);
if ((probeLMU(buffer, addr)))
printf(" gotcha, this is the LMU device");
}
printf("\n");
}
close(fd);
}
}
closedir(dh);
}
return 0;
}
int
getMachineID(int pmu)
{
char buffer[32];
int fd, n, machine = 0;
if ((fd = open(OFBASE"/model", O_RDONLY))) {
if ((n = read(fd, buffer, sizeof(buffer) - 1)) != -1) {
buffer[n] = 0; /* terminate buffer, only to be sure */
if (strncmp("PowerBook", buffer, 9) == 0) {
if (buffer[9] == 0)
/* Dummy codes for pre-Lombard PowerBooks */
machine = pmu - OHARE_PMU + 1;
else {
machine = (atoi(&buffer[9]) & 0xf) << 4;
for (n = 9; buffer[n] != ',' && buffer[n] != '\0'; ++n);
if (buffer[n] == ',')
machine |= atoi(&buffer[n+1]) & 0xf;
}
}
}
close(fd);
}
return machine;
}
const char*
getMachineName(int mid)
{
unsigned int x, y;
x = mid >> 4 & 0x0f;
y = mid & 0xf;
if (x < 7 && y < 10 && machines[x][y] != NULL)
return machines[x][y];
else
return machines[0][0];
}
int
main (void)
{
int addr, mid;
printf("\nProbing machine...\n");
mid = getMachineID(11);
if (mid != 0) {
printf (" Machine: ID = %x -> %s\n", mid, getMachineName(mid));
addr = getLMUAddress();
if (addr) {
printf(" LMU: I2C address = %x \n", addr);
findI2CDevice(addr);
} else
printf(" LMU: No LMU found!\n");
} else
printf (" Machine: This is not a PowerBook\n");
return 0;
}
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