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/* $OpenBSD: owctr.c,v 1.4 2010/07/19 23:44:09 deraadt Exp $ */
/*
* Copyright (c) 2010 John L. Scarfone <john@scarfone.net>
*
* 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.
*/
/*
* DS2423 1-Wire 4kbit SRAM with Counter family type device driver.
* Provides 4096 bits of SRAM and four 32-bit, read-only counters.
* This driver provides access to the two externally triggered
* counters.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/rwlock.h>
#include <sys/sensors.h>
#include <dev/onewire/onewiredevs.h>
#include <dev/onewire/onewirereg.h>
#include <dev/onewire/onewirevar.h>
/* Commands */
#define DSCTR_CMD_READ_MEMCOUNTER 0xa5
/* External counter banks */
#define DS2423_COUNTER_BANK_A 0x1c0
#define DS2423_COUNTER_BANK_B 0x1e0
/* Buffer offsets */
#define DS2423_COUNTER_BUF_COUNTER 35
#define DS2423_COUNTER_BUF_CRC 43
#define DS2423_COUNTER_BUFSZ 45
struct owctr_softc {
struct device sc_dev;
void * sc_onewire;
u_int64_t sc_rom;
struct ksensordev sc_sensordev;
struct ksensor sc_counterA;
struct ksensor sc_counterB;
struct sensor_task *sc_sensortask;
struct rwlock sc_lock;
};
int owctr_match(struct device *, void *, void *);
void owctr_attach(struct device *, struct device *, void *);
int owctr_detach(struct device *, int);
int owctr_activate(struct device *, int);
void owctr_update(void *);
void owctr_update_counter(void *, int);
struct cfattach owctr_ca = {
sizeof(struct owctr_softc),
owctr_match,
owctr_attach,
owctr_detach,
owctr_activate
};
struct cfdriver owctr_cd = {
NULL, "owctr", DV_DULL
};
static const struct onewire_matchfam owctr_fams[] = {
{ ONEWIRE_FAMILY_DS2423 }
};
int
owctr_match(struct device *parent, void *match, void *aux)
{
return (onewire_matchbyfam(aux, owctr_fams, nitems(owctr_fams)));
}
void
owctr_attach(struct device *parent, struct device *self, void *aux)
{
struct owctr_softc *sc = (struct owctr_softc *)self;
struct onewire_attach_args *oa = aux;
sc->sc_onewire = oa->oa_onewire;
sc->sc_rom = oa->oa_rom;
/* Initialize counter sensors */
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_counterA.type = SENSOR_INTEGER;
snprintf(sc->sc_counterA.desc, sizeof(sc->sc_counterA.desc),
"Counter A sn %012llx", ONEWIRE_ROM_SN(oa->oa_rom));
sensor_attach(&sc->sc_sensordev, &sc->sc_counterA);
sc->sc_counterB.type = SENSOR_INTEGER;
snprintf(sc->sc_counterB.desc, sizeof(sc->sc_counterB.desc),
"Counter B sn %012llx", ONEWIRE_ROM_SN(oa->oa_rom));
sensor_attach(&sc->sc_sensordev, &sc->sc_counterB);
sc->sc_sensortask = sensor_task_register(sc, owctr_update, 10);
if (sc->sc_sensortask == NULL) {
printf(": unable to register update task\n");
return;
}
sensordev_install(&sc->sc_sensordev);
rw_init(&sc->sc_lock, sc->sc_dev.dv_xname);
printf("\n");
}
int
owctr_detach(struct device *self, int flags)
{
struct owctr_softc *sc = (struct owctr_softc *)self;
rw_enter_write(&sc->sc_lock);
sensordev_deinstall(&sc->sc_sensordev);
if (sc->sc_sensortask != NULL)
sensor_task_unregister(sc->sc_sensortask);
rw_exit_write(&sc->sc_lock);
return (0);
}
int
owctr_activate(struct device *self, int act)
{
return (0);
}
void
owctr_update(void *arg)
{
owctr_update_counter(arg, DS2423_COUNTER_BANK_A);
owctr_update_counter(arg, DS2423_COUNTER_BANK_B);
}
void
owctr_update_counter(void *arg, int bank)
{
struct owctr_softc *sc = arg;
u_int32_t counter;
u_int16_t crc;
u_int8_t *buf;
rw_enter_write(&sc->sc_lock);
onewire_lock(sc->sc_onewire, 0);
if (onewire_reset(sc->sc_onewire) != 0)
goto done;
buf = malloc(DS2423_COUNTER_BUFSZ, M_DEVBUF, M_NOWAIT);
if (buf == NULL) {
printf("%s: malloc() failed\n", sc->sc_dev.dv_xname);
goto done;
}
onewire_matchrom(sc->sc_onewire, sc->sc_rom);
buf[0] = DSCTR_CMD_READ_MEMCOUNTER;
buf[1] = bank;
buf[2] = bank >> 8;
onewire_write_byte(sc->sc_onewire, buf[0]);
onewire_write_byte(sc->sc_onewire, buf[1]);
onewire_write_byte(sc->sc_onewire, buf[2]);
onewire_read_block(sc->sc_onewire, &buf[3], DS2423_COUNTER_BUFSZ-3);
crc = onewire_crc16(buf, DS2423_COUNTER_BUFSZ-2);
crc ^= buf[DS2423_COUNTER_BUF_CRC]
| (buf[DS2423_COUNTER_BUF_CRC+1] << 8);
if ( crc != 0xffff) {
printf("%s: invalid CRC\n", sc->sc_dev.dv_xname);
if (bank == DS2423_COUNTER_BANK_A) {
sc->sc_counterA.value = 0;
sc->sc_counterA.status = SENSOR_S_UNKNOWN;
sc->sc_counterA.flags |= SENSOR_FUNKNOWN;
} else {
sc->sc_counterB.value = 0;
sc->sc_counterB.status = SENSOR_S_UNKNOWN;
sc->sc_counterB.flags |= SENSOR_FUNKNOWN;
}
} else {
counter = buf[DS2423_COUNTER_BUF_COUNTER]
| (buf[DS2423_COUNTER_BUF_COUNTER+1] << 8)
| (buf[DS2423_COUNTER_BUF_COUNTER+2] << 16)
| (buf[DS2423_COUNTER_BUF_COUNTER+3] << 24);
if (bank == DS2423_COUNTER_BANK_A) {
sc->sc_counterA.value = counter;
sc->sc_counterA.status = SENSOR_S_UNSPEC;
sc->sc_counterA.flags &= ~SENSOR_FUNKNOWN;
} else {
sc->sc_counterB.value = counter;
sc->sc_counterB.status = SENSOR_S_UNSPEC;
sc->sc_counterB.flags &= ~SENSOR_FUNKNOWN;
}
}
onewire_reset(sc->sc_onewire);
free(buf, M_DEVBUF);
done:
onewire_unlock(sc->sc_onewire);
rw_exit_write(&sc->sc_lock);
}
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