/*	$NetBSD: netwalker_pwr.c,v 1.1 2014/05/06 11:08:51 hkenken Exp $	*/

/*
 * Copyright (c) 2014  Genetec Corporation.  All rights reserved.
 * Written by Hashimoto Kenichi for Genetec Corporation.
 *
 * 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 GENETEC CORPORATION ``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 GENETEC CORPORATION
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netwalker_pwr.c,v 1.1 2014/05/06 11:08:51 hkenken Exp $");

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

#include <dev/gpio/gpiovar.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

#include <dev/gpio/gpiovar.h>

#include <evbarm/netwalker/netwalker.h>

#define PWR_PIN_INPUT	0
#define PWR_NPINS	1


struct netwalker_pwr_softc {
	device_t sc_dev;
	void *sc_gpio;
	void *sc_intr;

	struct gpio_pinmap sc_map;
	int sc_map_pins[PWR_NPINS];

	struct sysmon_pswitch sc_smpsw;
	int sc_state;
};

static int netwalker_pwr_match(device_t, cfdata_t, void *);
static void netwalker_pwr_attach(device_t, device_t, void *);
static int netwalker_pwr_detach(device_t, int);

CFATTACH_DECL_NEW(netwalker_pwr, sizeof(struct netwalker_pwr_softc),
    netwalker_pwr_match, netwalker_pwr_attach, netwalker_pwr_detach, NULL);

static void netwalker_pwr_refresh(void *);
static int netwalker_pwr_intr(void *);


static int
netwalker_pwr_match(device_t parent, cfdata_t cf, void * aux)
{
	struct gpio_attach_args *ga = aux;

	if (strcmp(ga->ga_dvname, cf->cf_name))
		return 0;
	if (ga->ga_offset == -1)
		return 0;
	/* check that we have enough pins */
	if (gpio_npins(ga->ga_mask) != PWR_NPINS) {
		aprint_debug("%s: invalid pin mask 0x%02x\n", cf->cf_name,
		    ga->ga_mask);
		return 0;
	}

	return 1;
}

static void
netwalker_pwr_attach(device_t parent, device_t self, void *aux)
{
	struct netwalker_pwr_softc *sc = device_private(self);
	struct gpio_attach_args *ga = aux;
	int caps;

	sc->sc_dev = self;
	sc->sc_gpio = ga->ga_gpio;

	/* map pins */
	sc->sc_map.pm_map = sc->sc_map_pins;
	if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask, &sc->sc_map)) {
		aprint_error(": couldn't map the pins\n");
		return;
	}

	/* configure the input pin */
	caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, PWR_PIN_INPUT);
	if (!(caps & GPIO_PIN_INPUT)) {
		aprint_error(": pin is unable to read input\n");
		gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
		return;
	}
	gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, PWR_PIN_INPUT,
	    GPIO_PIN_INPUT);

	sc->sc_intr = intr_establish(GPIO1_IRQBASE + ga->ga_offset,
	    IPL_VM, IST_EDGE_BOTH, netwalker_pwr_intr, sc);
	if (sc->sc_intr == NULL) {
		aprint_error(": couldn't establish interrupt\n");
		gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
		return;
	}

	aprint_normal(": NETWALKER power button\n");
	aprint_naive(": NETWALKER power button\n");

	if (!pmf_device_register(sc->sc_dev, NULL, NULL)) {
		aprint_error_dev(sc->sc_dev,
		    "couldn't establish power handler\n");
	}

	sysmon_task_queue_init();
	sc->sc_smpsw.smpsw_name = device_xname(self);
	sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_POWER;
	sc->sc_state = PSWITCH_EVENT_RELEASED;
	sysmon_pswitch_register(&sc->sc_smpsw);
}

static int
netwalker_pwr_detach(device_t self, int flags)
{
	struct netwalker_pwr_softc *sc = device_private(self);

	if (sc->sc_intr != NULL)
		intr_disestablish(sc->sc_intr);

	gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
	pmf_device_deregister(self);
	sysmon_task_queue_fini();

	return 0;
}

static int
netwalker_pwr_intr(void *v)
{
	struct netwalker_pwr_softc *sc = v;

	sysmon_task_queue_sched(0, netwalker_pwr_refresh, sc);
	return 1;
}

static void
netwalker_pwr_refresh(void *v)
{
	struct netwalker_pwr_softc *sc = v;
	int pwr;
	int event;

	pwr = gpio_pin_read(sc->sc_gpio, &sc->sc_map, PWR_PIN_INPUT);
	event = (pwr == GPIO_PIN_HIGH) ?
	    PSWITCH_EVENT_RELEASED : PSWITCH_EVENT_PRESSED;

	/* crude way to avoid duplicate events */
	if(event == sc->sc_state)
		return;

	sc->sc_state = event;
	/* report the event */
	sysmon_pswitch_event(&sc->sc_smpsw, event);
}