/*	$OpenBSD: safte.c,v 1.9 2005/08/13 01:38:19 dlg Exp $ */

/*
 * Copyright (c) 2005 David Gwynne <dlg@openbsd.org>
 *
 * 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.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/scsiio.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/sensors.h>

#include <scsi/scsi_all.h>
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>

#include <scsi/safte.h>

#ifdef SAFTE_DEBUG
#define DPRINTF(x)	do { if (safte_debug) printf x ; } while (0)
int	safte_debug = 1;
#else
#define DPRINTF(x)	/* x */
#endif


int	safte_match(struct device *, void *, void *);
void	safte_attach(struct device *, struct device *, void *);
int	safte_detach(struct device *, int);

struct safte_sensor {
	struct sensor		se_sensor;
	enum {
		SAFTE_T_FAN,
		SAFTE_T_PWRSUP,
		SAFTE_T_DOORLOCK,
		SAFTE_T_ALARM,
		SAFTE_T_TEMP
	}			se_type;
	u_int8_t		*se_field;
};

struct safte_thread;

struct safte_softc {
	struct device		sc_dev;
	struct scsi_link	 *sc_link;

	u_int			sc_encbuflen;
	u_char			*sc_encbuf;

	int			sc_nsensors;
	struct safte_sensor	*sc_sensors;

	int			sc_celsius;
	int			sc_ntemps;
	struct safte_sensor	*sc_temps;
	u_int16_t		*sc_temperrs;

	struct safte_thread	*sc_thread;
};

struct cfattach safte_ca = {
	sizeof(struct safte_softc), safte_match, safte_attach, safte_detach
};

struct cfdriver safte_cd = {
	NULL, "safte", DV_DULL
};

#define DEVNAME(s)	((s)->sc_dev.dv_xname)

struct safte_thread {
	struct safte_softc	*sc;
	volatile int		running;
};

void	safte_create_thread(void *);
void	safte_refresh(void *);
int	safte_read_config(struct safte_softc *);
int	safte_read_encstat(struct safte_softc *);

int64_t	safte_temp2uK(u_int8_t, int);

int
safte_match(struct device *parent, void *match, void *aux)
{
	struct scsibus_attach_args	*sa = aux;
	struct scsi_inquiry_data	*inq = sa->sa_inqbuf;
	struct scsi_inquiry_data	inqbuf;
	struct scsi_inquiry		cmd;
	struct safte_inq		*si = (struct safte_inq *)&inqbuf.extra;

	if (inq == NULL)
		return (0);

	/* match on dell enclosures */
	if ((inq->device & SID_TYPE) == T_PROCESSOR &&
	    (inq->version & SID_ANSII) == SID_ANSII_SCSI3)
		return (2);

	if ((inq->device & SID_TYPE) != T_PROCESSOR ||
	    (inq->version & SID_ANSII) != SID_ANSII_SCSI2 ||
	    (inq->response_format & SID_ANSII) != SID_ANSII_SCSI2)
		return (0);

	memset(&cmd, 0, sizeof(cmd));
	cmd.opcode = INQUIRY;
	cmd.length = inq->additional_length + SAFTE_EXTRA_OFFSET;
	if (cmd.length > sizeof(inqbuf) || cmd.length < SAFTE_INQ_LEN)
		return(0);

	memset(&inqbuf, 0, sizeof(inqbuf));
	memset(&inqbuf.extra, ' ', sizeof(inqbuf.extra));

	if (scsi_scsi_cmd(sa->sa_sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), (u_char *)&inqbuf, cmd.length, 2, 10000, NULL,
	    SCSI_DATA_IN|SCSI_AUTOCONF) != 0)
		return (0);

	if (memcmp(si->ident, SAFTE_IDENT, sizeof(si->ident)) == 0)
		return (2);

	return (0);
}

void
safte_attach(struct device *parent, struct device *self, void *aux)
{
	struct safte_softc		*sc = (struct safte_softc *)self;
	struct scsibus_attach_args	*sa = aux;

	sc->sc_link = sa->sa_sc_link;
	sa->sa_sc_link->device_softc = sc;

	printf("\n");

	sc->sc_thread = malloc(sizeof(struct safte_thread), M_DEVBUF, M_NOWAIT);
	if (sc->sc_thread == NULL) {
		printf("%s: unable to allocate thread information\n",
		    DEVNAME(sc));
		return;
	}

	sc->sc_thread->sc = sc;
	sc->sc_thread->running = 1;

	if (safte_read_config(sc) != 0) {
		free(sc->sc_thread, M_DEVBUF);
		sc->sc_thread = NULL;
		printf("%s: unable to read enclosure configuration\n",
		    DEVNAME(sc));
		return;
	}


	kthread_create_deferred(safte_create_thread, sc);
}

int
safte_detach(struct device *self, int flags)
{
	struct safte_softc		*sc = (struct safte_softc *)self;
	int				i;

	if (sc->sc_thread != NULL) {
		sc->sc_thread->running = 0;
		wakeup(sc->sc_thread);
		sc->sc_thread = NULL;

		/*
		 * we can't free the sensors since there is no mechanism to
		 * take them out of the sensor list. mark them invalid instead.
		 */
		for (i = 0; i < sc->sc_nsensors; i++)
			sc->sc_sensors[i].se_sensor.flags |= SENSOR_FINVALID;

		free(sc->sc_encbuf, M_DEVBUF);
	}

	return (0);
}

void
safte_create_thread(void *arg)
{
	struct safte_softc		*sc = arg;

	if (kthread_create(safte_refresh, sc->sc_thread, NULL,
	    DEVNAME(sc)) != 0)
		panic("safte thread");
}

void
safte_refresh(void *arg)
{
	struct safte_thread		*thread = arg;
	struct safte_softc		*sc = thread->sc;
	int				ok = 1;

	while (thread->running) {
		if (safte_read_encstat(sc) != 0) {
			if (ok)
				printf("%s: error getting enclosure status\n",
				    DEVNAME(sc));
			ok = 0;
		} else {
			if (!ok)
				printf("%s: enclosure back online\n",
				    DEVNAME(sc));
			ok = 1;
		}
		tsleep(thread, PWAIT, "timeout", 10 * hz);
	}

	free(thread, M_DEVBUF);

	kthread_exit(0);
}

int
safte_read_config(struct safte_softc *sc)
{
	struct safte_readbuf_cmd	cmd;
	struct safte_config		config;
	struct safte_sensor		*s;
	int				flags, i, j;

	memset(&cmd, 0, sizeof(cmd));
	cmd.opcode = READ_BUFFER;
	cmd.flags |= SAFTE_RD_MODE;
	cmd.bufferid = SAFTE_RD_CONFIG;
	cmd.length = htobe16(sizeof(config));
	flags = SCSI_DATA_IN | SCSI_AUTOCONF;
#ifndef SCSIDEBUG
	flags |= SCSI_SILENT;
#endif

	if (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), (u_char *)&config, sizeof(config), 2, 30000, NULL,
	    flags) != 0)
		return (1);

	DPRINTF(("%s: nfans: %d npwrsup: %d nslots: %d doorlock: %d ntemps: %d"
	    " alarm: %d celsius: %d ntherm: %d\n", DEVNAME(sc), config.nfans,
	    config.npwrsup, config.nslots, config.doorlock, config.ntemps,
	    config.alarm, SAFTE_CFG_CELSIUS(config.therm),
	    SAFTE_CFG_NTHERM(config.therm)));

	sc->sc_encbuflen = config.nfans * sizeof(u_int8_t) + /* fan status */
	    config.npwrsup * sizeof(u_int8_t) + /* power supply status */
	    config.nslots * sizeof(u_int8_t) + /* device scsi id (lun) */
	    sizeof(u_int8_t) + /* door lock status */
	    sizeof(u_int8_t) + /* speaker status */
	    config.ntemps * sizeof(u_int8_t) + /* temp sensors */
	    sizeof(u_int16_t); /* temp out of range sensors */

	sc->sc_encbuf = malloc(sc->sc_encbuflen, M_DEVBUF, M_NOWAIT);
	if (sc->sc_encbuf == NULL)
		return (1);

	sc->sc_nsensors = config.nfans + config.npwrsup + config.ntemps + 
		(config.doorlock ? 1 : 0) + (config.alarm ? 1 : 0);

	sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct safte_sensor),
	    M_DEVBUF, M_NOWAIT);
	if (sc->sc_sensors == NULL) {
		free(sc->sc_sensors, M_DEVBUF);
		return (1);
	}

	memset(sc->sc_sensors, 0,
	    sc->sc_nsensors * sizeof(struct safte_sensor));
	s = sc->sc_sensors;

	for (i = 0; i < config.nfans; i++) {
		s->se_type = SAFTE_T_FAN;
		s->se_field = (u_int8_t *)(sc->sc_encbuf + i);
		s->se_sensor.type = SENSOR_INDICATOR;
		snprintf(s->se_sensor.desc, sizeof(s->se_sensor.desc),
		    "fan%d", i);

		s++;
	}
	j = config.nfans;

	for (i = 0; i < config.npwrsup; i++) {
		s->se_type = SAFTE_T_PWRSUP;
		s->se_field = (u_int8_t *)(sc->sc_encbuf + j++ + i);
		s->se_sensor.type = SENSOR_INDICATOR;
		snprintf(s->se_sensor.desc, sizeof(s->se_sensor.desc),
		    "psu%d", i);

		s++;
	}
	j += config.npwrsup + config.nslots; /* skip the slots for now */

	if (config.doorlock) {
		s->se_type = SAFTE_T_DOORLOCK;
		s->se_field = (u_int8_t *)(sc->sc_encbuf + j);
		s->se_sensor.type = SENSOR_INDICATOR;
		strlcpy(s->se_sensor.desc, "doorlock",
		    sizeof(s->se_sensor.desc));

		s++;
	}
	j++;

	if (config.alarm) {
		s->se_type = SAFTE_T_ALARM;
		s->se_field = (u_int8_t *)(sc->sc_encbuf + j);
		s->se_sensor.type = SENSOR_INDICATOR;
		strlcpy(s->se_sensor.desc, "alarm", sizeof(s->se_sensor.desc));

		s++;
	}
	j++;

	/*
	 * stash the temp info so we can get out of range status. limit the
	 * number so the out of temp checks cant go into memory it doesnt own
	 */
	sc->sc_ntemps = (config.ntemps > 15) ? 15 : config.ntemps;
	sc->sc_temps = s;
	sc->sc_celsius = SAFTE_CFG_CELSIUS(config.therm);
	for (i = 0; i < config.ntemps; i++) {
		s->se_type = SAFTE_T_TEMP;
		s->se_field = (u_int8_t *)(sc->sc_encbuf + j + i);
		s->se_sensor.type = SENSOR_TEMP;
		snprintf(s->se_sensor.desc, sizeof(s->se_sensor.desc),
		    "temp%d", i);

		s++;
	}
	j += config.ntemps;

	sc->sc_temperrs = (u_int16_t *)(sc->sc_encbuf + j);

	for (i = 0; i < sc->sc_nsensors; i++) {
		strlcpy(sc->sc_sensors[i].se_sensor.device, DEVNAME(sc),
		    sizeof(sc->sc_sensors[i].se_sensor.device));
		SENSOR_ADD(&sc->sc_sensors[i].se_sensor);
	}

	return (0);
}

int
safte_read_encstat(struct safte_softc *sc)
{
	struct safte_readbuf_cmd	cmd;
	int				flags, i;
	struct safte_sensor		*s;
	u_int16_t			oot;

	memset(&cmd, 0, sizeof(cmd));
	cmd.opcode = READ_BUFFER;
	cmd.flags |= SAFTE_RD_MODE;
	cmd.bufferid = SAFTE_RD_ENCSTAT;
	cmd.length = htobe16(sc->sc_encbuflen);
	flags = SCSI_DATA_IN;
#ifndef SCSIDEBUG
	flags |= SCSI_SILENT;
#endif

	if (scsi_scsi_cmd(sc->sc_link, (struct scsi_generic *)&cmd,
	    sizeof(cmd), sc->sc_encbuf, sc->sc_encbuflen, 2, 30000, NULL,
	    flags) != 0)
		return (1);

	for (i = 0; i < sc->sc_nsensors; i++) {
		s = &sc->sc_sensors[i];
		s->se_sensor.flags &= ~SENSOR_FUNKNOWN;

		DPRINTF(("%s: %d type: %d field: 0x%02x\n", DEVNAME(sc), i,
		    s->se_type, *s->se_field));

		switch (s->se_type) {
		case SAFTE_T_FAN:
			switch (*s->se_field) {
			case SAFTE_FAN_OP:
				s->se_sensor.value = 1;
				s->se_sensor.status = SENSOR_S_OK;
				break;
			case SAFTE_FAN_MF:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_CRIT;
				break;
			case SAFTE_FAN_NOTINST:
			case SAFTE_FAN_UNKNOWN:
			default:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_UNKNOWN;
				s->se_sensor.flags |= SENSOR_FUNKNOWN;
				break;
			}
			break;

		case SAFTE_T_PWRSUP:
			switch (*s->se_field) {
			case SAFTE_PWR_OP_ON:
				s->se_sensor.value = 1;
				s->se_sensor.status = SENSOR_S_OK;
				break;
			case SAFTE_PWR_OP_OFF:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_OK;
				break;
			case SAFTE_PWR_MF_ON:
				s->se_sensor.value = 1;
				s->se_sensor.status = SENSOR_S_CRIT;
				break;
			case SAFTE_PWR_MF_OFF:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_CRIT;
				break;
			case SAFTE_PWR_NOTINST:
			case SAFTE_PWR_PRESENT:
			case SAFTE_PWR_UNKNOWN:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_UNKNOWN;
				s->se_sensor.flags |= SENSOR_FUNKNOWN;
				break;
			}
			break;

		case SAFTE_T_DOORLOCK:
			switch (*s->se_field) {
			case SAFTE_DOOR_LOCKED:
				s->se_sensor.value = 1;
				s->se_sensor.status = SENSOR_S_OK;
				break;
			case SAFTE_DOOR_UNLOCKED:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_CRIT;
				break;
			case SAFTE_DOOR_UNKNOWN:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_CRIT;
				s->se_sensor.flags |= SENSOR_FUNKNOWN;
				break;
			}
			break;

		case SAFTE_T_ALARM:
			switch (*s->se_field) {
			case SAFTE_SPKR_OFF:
				s->se_sensor.value = 0;
				s->se_sensor.status = SENSOR_S_OK;
				break;
			case SAFTE_SPKR_ON:
				s->se_sensor.value = 1;
				s->se_sensor.status = SENSOR_S_CRIT;
				break;
			}

		case SAFTE_T_TEMP:
			s->se_sensor.value = safte_temp2uK(*s->se_field,
			    sc->sc_celsius);
			break;
		}
	}

	oot = betoh16(*sc->sc_temperrs);
	for (i = 0; i < sc->sc_ntemps; i++)
		sc->sc_temps[i].se_sensor.status = 
		    (oot & (1 << i)) ? SENSOR_S_CRIT : SENSOR_S_OK;

	return(0);
}

int64_t
safte_temp2uK(u_int8_t measured, int celsius)
{
	int64_t				temp;

	temp = (int64_t)measured;
	temp += SAFTE_TEMP_OFFSET;
	temp *= 1000000; /* convert to micro (mu) degrees */
	if (!celsius)
		temp = ((temp - 32000000) * 5) / 9; /* convert to Celsius */

	temp += 273150000; /* convert to kelvin */

	return (temp);
}