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/* $OpenBSD: owserial.c,v 1.1 2008/04/07 22:55:57 miod Exp $ */
/*
* Copyright (c) 2008 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* DS2505 1-Wire Add-only memory driver, for SGI machines.
*
* SGI seems to use DS2505 (or compatibles) to store serial numbers.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <dev/onewire/onewiredevs.h>
#include <dev/onewire/onewirereg.h>
#include <dev/onewire/onewirevar.h>
#include <sgi/dev/owmem_subr.h>
#include <sgi/dev/owserialvar.h>
int owserial_match(struct device *, void *, void *);
void owserial_attach(struct device *, struct device *, void *);
struct cfattach owserial_ca = {
sizeof(struct owserial_softc), owserial_match, owserial_attach,
};
struct cfdriver owserial_cd = {
NULL, "owserial", DV_DULL
};
#define EEPROM_PAGE_SIZE (256 / NBBY) /* 256 bits per page */
static const struct onewire_matchfam owserial_fams[] = {
{ ONEWIRE_FAMILY_DS2505 },
{ ONEWIRE_FAMILY_DS2506 }
};
int owserial_read_page(struct owserial_softc *, int, uint8_t *);
int owserial_read_redirect(struct owserial_softc *);
void owserial_read_serial(struct owserial_softc *);
int
owserial_match(struct device *parent, void *match, void *aux)
{
return (onewire_matchbyfam(aux, owserial_fams,
sizeof(owserial_fams) /sizeof(owserial_fams[0])));
}
void
owserial_attach(struct device *parent, struct device *self, void *aux)
{
struct owserial_softc *sc = (struct owserial_softc *)self;
struct onewire_attach_args *oa = aux;
sc->sc_onewire = oa->oa_onewire;
sc->sc_rom = oa->oa_rom;
/*
* Decide how many pages of 256 bits we have.
*/
if (ONEWIRE_ROM_FAMILY_TYPE(sc->sc_rom) == ONEWIRE_FAMILY_DS2506)
sc->sc_npages = 256;
else
sc->sc_npages = 64;
/*
* Read the redirection table.
*/
if (owserial_read_redirect(sc) != 0) {
printf(": unable to read redirection data\n");
return;
}
printf("\n");
/*
* Read the data.
*/
owserial_read_serial(sc);
}
int
owserial_read_redirect(struct owserial_softc *sc)
{
int rc = 0;
int status_offset, pos;
status_offset = 0x0100; /* 100..13f or 100..1ff */
pos = 0;
onewire_lock(sc->sc_onewire, 0);
if ((rc = onewire_reset(sc->sc_onewire)) != 0)
goto unlock;
onewire_matchrom(sc->sc_onewire, sc->sc_rom);
/*
* Start reading the EEPROM status block, at the page redirection
* offset.
*/
onewire_write_byte(sc->sc_onewire, ONEWIRE_CMD_READ_STATUS);
onewire_write_byte(sc->sc_onewire, status_offset & 0xff);
onewire_write_byte(sc->sc_onewire, status_offset >> 8);
for (pos = 0; pos < sc->sc_npages; pos += 8) {
onewire_read_block(sc->sc_onewire, sc->sc_redir + pos, 8);
/* XXX check crc */
(void)onewire_read_byte(sc->sc_onewire);
(void)onewire_read_byte(sc->sc_onewire);
}
onewire_reset(sc->sc_onewire);
unlock:
onewire_unlock(sc->sc_onewire);
return rc;
}
int
owserial_read_page(struct owserial_softc *sc, int page, uint8_t *buf)
{
int rc = 0;
int pg;
/*
* Follow the redirection information.
*/
if ((pg = owmem_redirect(sc->sc_redir, sc->sc_npages, page)) < 0)
return EINVAL;
pg = page * EEPROM_PAGE_SIZE;
onewire_lock(sc->sc_onewire, 0);
if ((rc = onewire_reset(sc->sc_onewire)) != 0)
goto unlock;
onewire_matchrom(sc->sc_onewire, sc->sc_rom);
/*
* Start reading the EEPROM data.
*/
onewire_write_byte(sc->sc_onewire, ONEWIRE_CMD_READ_MEMORY);
onewire_write_byte(sc->sc_onewire, pg & 0xff);
onewire_write_byte(sc->sc_onewire, pg >> 8);
onewire_read_block(sc->sc_onewire, buf, EEPROM_PAGE_SIZE);
onewire_reset(sc->sc_onewire);
unlock:
onewire_unlock(sc->sc_onewire);
return rc;
}
void
owserial_read_serial(struct owserial_softc *sc)
{
uint8_t buf[EEPROM_PAGE_SIZE * 2];
char serial[1 + OWSERIAL_NAME_LEN];
char descr[1 + OWSERIAL_SERIAL_LEN], *dptr;
int pg;
int i;
pg = owmem_redirect(sc->sc_redir, sc->sc_npages, 0);
if (pg < 0 || owserial_read_page(sc, pg, buf) != 0)
return;
pg = owmem_redirect(sc->sc_redir, sc->sc_npages, 1);
if (pg < 0 || owserial_read_page(sc, pg, buf + EEPROM_PAGE_SIZE) != 0)
return;
/* minimal sanity check */
if (buf[0] != 0x01)
return;
for (i = EEPROM_PAGE_SIZE + 10; i < EEPROM_PAGE_SIZE + 16; i++)
if (buf[i] != 0xff)
return;
bcopy(buf + 21, serial, 9);
bcopy(buf + EEPROM_PAGE_SIZE + 3, serial + 9, 3);
serial[OWSERIAL_NAME_LEN] = '\0';
for (i = 0; i < OWSERIAL_NAME_LEN; i++)
if (serial[i] != '-' && (serial[i] < '0' || serial[i] > '9'))
return;
bcopy(buf + EEPROM_PAGE_SIZE + 16, descr, OWSERIAL_SERIAL_LEN);
descr[OWSERIAL_SERIAL_LEN] = '\0';
for (i = 0; i < OWSERIAL_SERIAL_LEN; i++)
if (descr[i] < ' ' || descr[i] > '~')
return;
for (dptr = descr; *dptr == ' '; dptr++);
strlcpy(sc->sc_name, dptr, sizeof sc->sc_name);
strlcpy(sc->sc_serial, serial, sizeof sc->sc_serial);
printf("%s: \"%s\" serial %s\n", sc->sc_dev.dv_xname, dptr, serial);
}
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