/*      $NetBSD: netwalker_lid.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_lid.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 LID_PIN_INPUT   0
#define LID_NPINS       1

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

       struct gpio_pinmap sc_map;
       int sc_map_pins[LID_NPINS];

       struct sysmon_pswitch sc_smpsw;
       int sc_state;
};

static int netwalker_lid_match(device_t, cfdata_t, void *);
static void netwalker_lid_attach(device_t, device_t, void *);
static int netwalker_lid_detach(device_t, int);

CFATTACH_DECL_NEW(netwalker_lid, sizeof(struct netwalker_lid_softc),
   netwalker_lid_match, netwalker_lid_attach, netwalker_lid_detach, NULL);

static void netwalker_lid_refresh(void *);
static int netwalker_lid_intr(void *);


static int
netwalker_lid_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) != LID_NPINS) {
               aprint_debug("%s: invalid pin mask 0x%02x\n", cf->cf_name,
                   ga->ga_mask);
               return 0;
       }

       return 1;
}

static void
netwalker_lid_attach(device_t parent, device_t self, void *aux)
{
       struct netwalker_lid_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, LID_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, LID_PIN_INPUT,
           GPIO_PIN_INPUT);

       sc->sc_intr = intr_establish(GPIO3_IRQBASE + ga->ga_offset,
           IPL_VM, IST_EDGE_BOTH, netwalker_lid_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 lid switch\n");
       aprint_naive(": NETWALKER lid switch\n");

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

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

static int
netwalker_lid_detach(device_t self, int flags)
{
       struct netwalker_lid_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_lid_intr(void *v)
{
       struct netwalker_lid_softc *sc = v;

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

static void
netwalker_lid_refresh(void *v)
{
       struct netwalker_lid_softc *sc = v;
       int lid;
       int event;

       lid = gpio_pin_read(sc->sc_gpio, &sc->sc_map, LID_PIN_INPUT);
       event = (lid == 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);
}