NetBSD/sys/dev/i2c/pic16lc.c

/* $NetBSD: pic16lc.c,v 1.15 2008/06/08 03:56:09 tsutsui Exp $ */

/*-
 * Copyright (c) 2007, 2008 Jared D. McNeill <jmcneill@invisible.ca>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Microsoft XBOX System Management Controller
 *
 * Documentation lives here:
 *  http://www.xbox-linux.org/wiki/PIC
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pic16lc.c,v 1.15 2008/06/08 03:56:09 tsutsui Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>

#include <machine/xbox.h>

#include <dev/sysmon/sysmonvar.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/pic16lcreg.h>

static int	pic16lc_match(device_t, cfdata_t, void *);
static void	pic16lc_attach(device_t, device_t, void *);

static int	pic16lc_intr(void *);

void		pic16lc_reboot(void);
void		pic16lc_poweroff(void);
void		pic16lc_setled(uint8_t);

struct pic16lc_softc {
	device_t	sc_dev;

	i2c_tag_t	sc_tag;
	i2c_addr_t	sc_addr;
	void *		sc_ih;

	envsys_data_t sc_sensor[1];
	struct sysmon_envsys *sc_sme;
};

static struct pic16lc_softc *pic16lc = NULL;

#define XBOX_SENSOR_CPU		0
#define XBOX_SENSOR_BOARD	1
#define XBOX_NSENSORS		2

static void	pic16lc_update(struct pic16lc_softc *, envsys_data_t *);
static void	pic16lc_refresh(struct sysmon_envsys *, envsys_data_t *);

static void	pic16lc_write_1(struct pic16lc_softc *, uint8_t, uint8_t);
static void	pic16lc_read_1(struct pic16lc_softc *, uint8_t, uint8_t *);

CFATTACH_DECL_NEW(pic16lc, sizeof(struct pic16lc_softc),
    pic16lc_match, pic16lc_attach, NULL, NULL);

static int
pic16lc_match(device_t parent, cfdata_t cf, void *opaque)
{
	struct i2c_attach_args *ia = opaque;

	if (pic16lc != NULL) /* we can only have one... */
		return 0;
	if (ia->ia_addr != 0x10) /* must live at 0x10 on xbox */
		return 0;

	return 1;
}

static void
pic16lc_attach(device_t parent, device_t self, void *opaque)
{
	struct pic16lc_softc *sc = device_private(self);
	struct i2c_attach_args *ia = opaque;
	u_char ver[4];
	int i;

	sc->sc_dev = self;
	sc->sc_tag = ia->ia_tag;
	sc->sc_addr = ia->ia_addr;

	pic16lc = sc;

	sc->sc_sme = sysmon_envsys_create();

	/* initialize CPU sensor */
	sc->sc_sensor[XBOX_SENSOR_CPU].units = ENVSYS_STEMP;
	(void)strlcpy(sc->sc_sensor[XBOX_SENSOR_CPU].desc, "Xbox CPU Temp",
	    sizeof(sc->sc_sensor[XBOX_SENSOR_CPU]));
	/* initialize board sensor */
	sc->sc_sensor[XBOX_SENSOR_BOARD].units = ENVSYS_STEMP;
	(void)strlcpy(sc->sc_sensor[XBOX_SENSOR_BOARD].desc, "Xbox Board Temp",
	    sizeof(sc->sc_sensor[XBOX_SENSOR_BOARD]));

	for (i = 0; i < XBOX_NSENSORS; i++) {
		if (sysmon_envsys_sensor_attach(sc->sc_sme,
						&sc->sc_sensor[i])) {
			sysmon_envsys_destroy(sc->sc_sme);
			return;
		}
	}

	/* hook into sysmon */
	sc->sc_sme->sme_name = device_xname(sc->sc_dev);
	sc->sc_sme->sme_cookie = sc;
	sc->sc_sme->sme_refresh = pic16lc_refresh;

	if (sysmon_envsys_register(sc->sc_sme)) {
		aprint_error_dev(self, "unable to register with sysmon\n");
		sysmon_envsys_destroy(sc->sc_sme);
		return;
	}

	if (iic_acquire_bus(sc->sc_tag, 0) != 0) {
		aprint_error(": unable to acquire i2c bus\n");
		return;
	}

	aprint_normal(": Xbox System Management Controller");

	/* find the PIC version */
	pic16lc_write_1(sc, PIC16LC_REG_VER, 0x00);
	pic16lc_read_1(sc, PIC16LC_REG_VER, &ver[0]);
	pic16lc_read_1(sc, PIC16LC_REG_VER, &ver[1]);
	pic16lc_read_1(sc, PIC16LC_REG_VER, &ver[2]);
	ver[3] = '\0';

	aprint_normal(" (rev. %s)\n", ver);

	pic16lc_setled(0xff);	/* orange */

	iic_release_bus(sc->sc_tag, 0);

	/* disable reset on eject */
	pic16lc_write_1(sc, PIC16LC_REG_RESETONEJECT, 0x01);

	sc->sc_ih = iic_smbus_intr_establish_proc(sc->sc_tag, pic16lc_intr, sc);
	if (sc->sc_ih == NULL)
		aprint_error_dev(self, "couldn't establish interrupt\n");

	return;
}

static void
pic16lc_write_1(struct pic16lc_softc *sc, uint8_t cmd, uint8_t val)
{
	iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
	    sc->sc_addr, &cmd, 1, &val, 1, 0);
}

static void
pic16lc_read_1(struct pic16lc_softc *sc, uint8_t cmd, uint8_t *valp)
{
	iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
	    sc->sc_addr, &cmd, 1, valp, 1, 0);
}

static void
pic16lc_update(struct pic16lc_softc *sc, envsys_data_t *edata)
{
	uint8_t cputemp, boardtemp;

	if (iic_acquire_bus(sc->sc_tag, 0) != 0) {
		aprint_error(": unable to acquire i2c bus\n");
		return;
	}

	if (edata->sensor == XBOX_SENSOR_CPU) {
		pic16lc_read_1(sc, PIC16LC_REG_CPUTEMP, &cputemp);
		edata->state = ENVSYS_SVALID;
		edata->value_cur = (int)cputemp * 1000000 + 273150000;
	} else {
		pic16lc_read_1(sc, PIC16LC_REG_BOARDTEMP, &boardtemp);
		edata->state = ENVSYS_SVALID;
		edata->value_cur = (int)boardtemp * 1000000 + 273150000;
	}

	iic_release_bus(sc->sc_tag, 0);

	return;
}

static void
pic16lc_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
	struct pic16lc_softc *sc = sme->sme_cookie;

	pic16lc_update(sc, edata);
}

static int
pic16lc_intr(void *opaque)
{
	struct pic16lc_softc *sc = opaque;
	uint8_t val;
	int rv = 0;

	pic16lc_read_1(sc, PIC16LC_REG_INTSTATUS, &val);
	if (val == 0)
		return rv;

	if (val & PIC16LC_REG_INTSTATUS_POWER)
		aprint_normal_dev(sc->sc_dev, "power button pressed\n");
	if (val & PIC16LC_REG_INTSTATUS_TRAYCLOSED)
		aprint_normal_dev(sc->sc_dev, "tray closed\n");
	if (val & PIC16LC_REG_INTSTATUS_TRAYOPENING) {
		aprint_normal_dev(sc->sc_dev, "tray opening\n");
		pic16lc_write_1(sc, PIC16LC_REG_INTACK, 0x02);
	}
	if (val & PIC16LC_REG_INTSTATUS_AVPACK_UNPLUG)
		aprint_normal_dev(sc->sc_dev, "A/V pack removed\n");
	if (val & PIC16LC_REG_INTSTATUS_AVPACK_PLUG)
		aprint_normal_dev(sc->sc_dev, "A/V pack inserted\n");
	if (val & PIC16LC_REG_INTSTATUS_EJECT_BUTTON) {
		pic16lc_write_1(sc, PIC16LC_REG_INTACK, 0x04);
		pic16lc_write_1(sc, PIC16LC_REG_TRAYEJECT, 0x00);
		++rv;
	}
	if (val & PIC16LC_REG_INTSTATUS_TRAYCLOSING)
		aprint_normal_dev(sc->sc_dev, "tray closing\n");

	return rv;
}

void
pic16lc_reboot(void)
{
	if (pic16lc == NULL) {
		printf("pic16lc_reboot: driver not attached!\n");
		return;
	}
	pic16lc_write_1(pic16lc, PIC16LC_REG_POWER, PIC16LC_REG_POWER_RESET);
}

void
pic16lc_poweroff(void)
{
	if (pic16lc == NULL) {
		printf("pic16lc_poweroff: driver not attached!\n");
		return;
	}
	pic16lc_write_1(pic16lc, PIC16LC_REG_POWER, PIC16LC_REG_POWER_SHUTDOWN);
}

void
pic16lc_setled(uint8_t val)
{
	if (pic16lc == NULL) {
		printf("pic16lc_setled: driver not attached!\n");
		return;
	}
	pic16lc_write_1(pic16lc, PIC16LC_REG_LEDSEQ, val);
	pic16lc_write_1(pic16lc, PIC16LC_REG_LEDMODE, 0x01);
}