/*      $NetBSD: obsled.c,v 1.12 2024/09/07 06:17:38 andvar Exp $       */

/*
 * Copyright (c) 2004 Shigeyuki Fukushima.
 * 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.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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: obsled.c,v 1.12 2024/09/07 06:17:38 andvar Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/systm.h>

#include <machine/obs266.h>

#include <powerpc/ibm4xx/dev/gpiovar.h>

struct obsled_softc {
        device_t sc_dev;
        gpio_tag_t sc_tag;
        int sc_addr;
        int sc_led_state;       /* LED status (ON=1/OFF=0) */
        int sc_led_state_mib;
};

static void     obsled_attach(device_t, device_t, void *);
static int      obsled_match(device_t, cfdata_t, void *);
static int      obsled_sysctl_verify(SYSCTLFN_PROTO);
static void     obsled_set_state(struct obsled_softc *);

CFATTACH_DECL_NEW(obsled, sizeof(struct obsled_softc),
        obsled_match, obsled_attach, NULL, NULL);

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

        /* XXX: support only OpenBlockS266 LED */
        if (ga->ga_addr == OBS266_GPIO_LED1)
                return (1);
        else if (ga->ga_addr == OBS266_GPIO_LED2)
                return (1);
        else if (ga->ga_addr == OBS266_GPIO_LED4)
                return (1);

        return (0);
}

static void
obsled_attach(device_t parent, device_t self, void *aux)
{
        struct obsled_softc *sc = device_private(self);
        struct gpio_attach_args *ga = aux;
        struct sysctlnode *node;
        int err, node_mib;
        char led_name[5];
        /* int led = (1 << device_unit(sc->sc_dev)); */

        snprintf(led_name, sizeof(led_name),
                "led%d", (1 << device_unit(sc->sc_dev)) & 0x7);
        aprint_naive(": OpenBlockS %s\n", led_name);
        aprint_normal(": OpenBlockS %s\n", led_name);

        sc->sc_dev = self;
        sc->sc_tag = ga->ga_tag;
        sc->sc_addr = ga->ga_addr;
        sc->sc_led_state = 0;

        obs266_led_set(OBS266_LED_OFF);

        /* add sysctl interface */
        err = sysctl_createv(NULL, 0,
                        NULL, (const struct sysctlnode **)&node,
                        0, CTLTYPE_NODE,
                        "obsled",
                        NULL,
                        NULL, 0, NULL, 0,
                        CTL_HW, CTL_CREATE, CTL_EOL);
        if (err  != 0)
                return;
        node_mib = node->sysctl_num;
        err = sysctl_createv(NULL, 0,
                        NULL, (const struct sysctlnode **)&node,
                        CTLFLAG_READWRITE, CTLTYPE_INT,
                        led_name,
                        SYSCTL_DESCR("OpenBlockS LED state (0=off, 1=on)"),
                        obsled_sysctl_verify, 0, (void *)sc, 0,
                        CTL_HW, node_mib, CTL_CREATE, CTL_EOL);
        if (err  != 0)
                return;

        sc->sc_led_state_mib = node->sysctl_num;
#if 0
        {
                gpio_tag_t tag = sc->sc_tag;
                (*(tag)->io_or_write)((tag)->cookie, sc->sc_addr, 0);
        }
#endif
}

static int
obsled_sysctl_verify(SYSCTLFN_ARGS)
{
        struct obsled_softc *sc = rnode->sysctl_data;
        struct sysctlnode node;
        int err, state;

        node = *rnode;
        state = sc->sc_led_state;
        node.sysctl_data = &state;

        err = sysctl_lookup(SYSCTLFN_CALL(&node));
        if (err != 0 || newp == NULL)
                return err;

        if (node.sysctl_num == sc->sc_led_state_mib) {
                if (state < 0 || state > 1)
                        return EINVAL;
                sc->sc_led_state = state;
                obsled_set_state(sc);
        }

        return 0;
}

static void
obsled_set_state(struct obsled_softc *sc)
{
        gpio_tag_t tag = sc->sc_tag;

        (*(tag)->io_or_write)((tag)->cookie,
                                sc->sc_addr, 
                                (~(sc->sc_led_state) & 1));
        /* GPIO LED input ON=0/OFF=1 */
}

/*
 * Setting LED interface for inside kernel.
 * Argument `led' is 3-bit LED state (led=0-7/ON=1/OFF=0).
 */
void
obs266_led_set(int led)
{
        device_t dv;
        deviter_t di;

        /*
         * Searching "obsled" devices from device tree.
         * Do you have a better idea?
         */
        for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL;
             dv = deviter_next(&di)) {
                if (device_is_a(dv, "obsles")) {
                        struct obsled_softc *sc = device_private(dv);
                        sc->sc_led_state =
                            (led & (1 << device_unit(dv))) >> device_unit(dv);
                        obsled_set_state(sc);
                }
        }
        deviter_release(&di);
}