SOLVED: Ticket #1409

[bjorn@mork.no (Bjørn Mork)]

I didn't find any way of updating the ticket, so I'm sending this via
mail.  After writing the original ticket I downloaded and read the
IT8712F data sheet, which I of course should have done first...  This
enabled me to write a small program to retrieve the non-default
address of the IT8712F on the Asus A7N8X-VM:


#include <stdio.h>
#include <unistd.h>
#include <sys/io.h> 
#include <string.h>

int main(int argc, char **argv) {
        if (ioperm(0x0, 0x3ff, 1)) {
                perror("Set i/o permission");
                exit(0);
        }

        /* enter MB PnP mode */
        outb(0x87, 0x2e);
        outb(0x01, 0x2e);
        outb(0x55, 0x2e);
        outb(0x55, 0x2e);

        /* get chip ID */
        outb(0x20, 0x2e);
        printf("chip id = 0x%02x", inb(0x2f));
        outb(0x21, 0x2e);
        printf("%02x\n", inb(0x2f));

        /* select GPIO */
        outb(0x07, 0x2e);
        outb(0x04, 0x2f);

        outb(0x60, 0x2e); /* address MSB */
        printf("LDN 4, reg 0x60 = 0x%02x\n", inb(0x2f));  /* default 0x02 */
        outb(0x61, 0x2e); /* address LSB */
        printf("LDN 4, reg 0x61 = 0x%02x\n", inb(0x2f));  /* default 0x90 */
        outb(0x30, 0x2e); /* enable */
        printf("LDN 4, reg 0x30 = 0x%02x\n", inb(0x2f));  /* default 0x00, should be >0 */

        /* exit from MB PnP mode */
        outb(0x02, 0x2e);
        outb(0x02, 0x2f);
        return 0;
}


Which gave the following output right after a reboot:

chip id = 0x8712
LDN 4, reg 0x60 = 0x0d
LDN 4, reg 0x61 = 0x00
LDN 4, reg 0x30 = 0x01

I.e. Asus have changed the base address from 0x290 to 0xd00.  Using
this address with it87 worked perfectly:

  modprobe it87 probe‘91,0x0d00


I wonder however, would it be possible to include a refined version of
the address detection code in the module?  I am willing to try to
write it myself, but I won't do it unless I know it has some remote
possibility of being included.


Bj?rn