/* $NetBSD: gpiokeys.c,v 1.11 2021/08/07 16:19:10 thorpej Exp $ */

/*-
* Copyright (c) 2015 Jared D. McNeill <[email protected]>
* 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 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: gpiokeys.c,v 1.11 2021/08/07 16:19:10 thorpej Exp $");

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

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

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wskbdvar.h>
#include <dev/wscons/wsksymdef.h>
#include <dev/wscons/wsksymvar.h>
#include <dev/wscons/linux_keymap.h>

#include <dev/fdt/fdtvar.h>

#define GPIOKEYS_POLL_INTERVAL  mstohz(200)

/* Event types */
#define EV_KEY          1
#define EV_SW           5

/* Key and button events */
#define KEY_POWER       116
#define KEY_SLEEP       142

/* Switch events */
#define SW_LID          0

static int      gpiokeys_match(device_t, cfdata_t, void *);
static void     gpiokeys_attach(device_t, device_t, void *);

static void     gpiokeys_tick(void *);
static void     gpiokeys_task(void *);

extern const struct wscons_keydesc hidkbd_keydesctab[];
static const struct wskbd_mapdata gpiokeys_keymapdata = {
       hidkbd_keydesctab,
       KB_US,
};

struct gpiokeys_softc;

struct gpiokeys_key {
       struct gpiokeys_softc   *key_sc;
       int                     key_phandle;
       char                    *key_label;
       struct fdtbus_gpio_pin  *key_pin;
       u_int                   key_debounce;
       u_int                   key_code;
       struct sysmon_pswitch   key_pswitch;
       uint8_t                 key_usbcode;
       int                     key_state;

       struct gpiokeys_key     *key_next;
};

struct gpiokeys_softc {
       device_t        sc_dev;
       int             sc_phandle;

       struct fdtbus_gpio_pin *sc_pin;
       bool            sc_always_on;
       bool            sc_enable_val;

       struct gpiokeys_key *sc_keys;
       callout_t       sc_tick;

       device_t        sc_wskbddev;
       int             sc_enabled;
};

CFATTACH_DECL_NEW(gpiokeys, sizeof(struct gpiokeys_softc),
   gpiokeys_match, gpiokeys_attach, NULL, NULL);

static int
gpiokeys_enable(void *v, int on)
{
       struct gpiokeys_softc * const sc = v;

       sc->sc_enabled = on;

       return 0;
}

static void
gpiokeys_set_leds(void *v, int leds)
{
}

static int
gpiokeys_ioctl(void *v, u_long cmd, void *data, int flag, lwp_t *l)
{
       switch (cmd) {
       case WSKBDIO_GTYPE:
               *(int *)data = WSKBD_TYPE_USB;
               return 0;
       }

       return EPASSTHROUGH;
}

static const struct wskbd_accessops gpiokeys_accessops = {
       .enable = gpiokeys_enable,
       .set_leds = gpiokeys_set_leds,
       .ioctl = gpiokeys_ioctl
};

static const struct device_compatible_entry compat_data[] = {
       { .compat = "gpio-keys" },
       DEVICE_COMPAT_EOL
};

static int
gpiokeys_match(device_t parent, cfdata_t cf, void *aux)
{
       const struct fdt_attach_args *faa = aux;

       return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
gpiokeys_attach(device_t parent, device_t self, void *aux)
{
       struct gpiokeys_softc * const sc = device_private(self);
       const struct fdt_attach_args *faa = aux;
       const int phandle = faa->faa_phandle;
       struct gpiokeys_key *key;
       u_int debounce, input_type, code;
       int use_wskbddev = 0;
       int child, len;

       sc->sc_dev = self;
       sc->sc_phandle = phandle;

       aprint_naive("\n");
       aprint_normal(":");

       for (child = OF_child(phandle); child; child = OF_peer(child)) {
               if (of_getprop_uint32(child, "linux,input-type", &input_type))
                       input_type = EV_KEY;    /* default */
               if (of_getprop_uint32(child, "linux,code", &code))
                       continue;
               if (of_getprop_uint32(child, "debounce-interval", &debounce))
                       debounce = 5;   /* default */
               len = OF_getproplen(child, "label");
               if (len <= 0) {
                       continue;
               }
               key = kmem_zalloc(sizeof(*key), KM_SLEEP);
               key->key_sc = sc;
               key->key_phandle = child;
               key->key_code = code;
               key->key_label = kmem_zalloc(len, KM_SLEEP);
               if (OF_getprop(child, "label", key->key_label, len) != len) {
                       kmem_free(key->key_label, len);
                       kmem_free(key, sizeof(*key));
                       continue;
               }
               key->key_debounce = debounce;
               key->key_pin = fdtbus_gpio_acquire(child, "gpios",
                   GPIO_PIN_INPUT);
               if (key->key_pin)
                       key->key_state = fdtbus_gpio_read(key->key_pin);

               switch (input_type) {
               case EV_KEY:
                       switch (code) {
                       case KEY_POWER:
                               key->key_pswitch.smpsw_name = key->key_label;
                               key->key_pswitch.smpsw_type = PSWITCH_TYPE_POWER;
                               break;
                       case KEY_SLEEP:
                               key->key_pswitch.smpsw_name = key->key_label;
                               key->key_pswitch.smpsw_type = PSWITCH_TYPE_SLEEP;
                               break;
                       default:
                               key->key_usbcode = linux_key_to_usb(code);
                               if (key->key_usbcode != 0) {
                                       use_wskbddev++;
                               } else {
                                       key->key_pswitch.smpsw_name = key->key_label;
                                       key->key_pswitch.smpsw_type = PSWITCH_TYPE_HOTKEY;
                               }
                               break;
                       }
                       break;
               case EV_SW:
                       key->key_pswitch.smpsw_name = key->key_label;
                       switch (code) {
                       case SW_LID:
                               key->key_state = -1;    /* Send notification on attach */
                               key->key_pswitch.smpsw_type = PSWITCH_TYPE_LID;
                               break;
                       default:
                               key->key_pswitch.smpsw_type = PSWITCH_TYPE_HOTKEY;
                               break;
                       }
                       break;
               }

               if (key->key_pswitch.smpsw_name != NULL &&
                   sysmon_pswitch_register(&key->key_pswitch) != 0) {
                       aprint_error(" %s:ERROR", key->key_label);
                       kmem_free(key->key_label, len);
                       kmem_free(key, sizeof(*key));
                       continue;
               }

               if (sc->sc_keys) {
                       aprint_normal(", %s", key->key_label);
               } else {
                       aprint_normal(" %s", key->key_label);
               }

               key->key_next = sc->sc_keys;
               sc->sc_keys = key;
       }

       if (sc->sc_keys == NULL) {
               aprint_normal(" no keys configured\n");
               return;
       }

       aprint_normal("\n");

       if (use_wskbddev > 0) {
               struct wskbddev_attach_args a;
               memset(&a, 0, sizeof(a));
               a.console = false;
               a.keymap = &gpiokeys_keymapdata;
               a.accessops = &gpiokeys_accessops;
               a.accesscookie = sc;
               sc->sc_wskbddev =
                   config_found(self, &a, wskbddevprint, CFARGS_NONE);
       }

       callout_init(&sc->sc_tick, CALLOUT_MPSAFE);
       callout_setfunc(&sc->sc_tick, gpiokeys_tick, sc);

       gpiokeys_tick(sc);
}

static void
gpiokeys_tick(void *priv)
{
       struct gpiokeys_softc * const sc = priv;
       struct gpiokeys_key *key;

       for (key = sc->sc_keys; key; key = key->key_next) {
               if (key->key_pin == NULL) {
                       continue;
               }
               const int new_state = fdtbus_gpio_read(key->key_pin);
               if (new_state != key->key_state) {
                       key->key_state = new_state;
                       sysmon_task_queue_sched(0, gpiokeys_task, key);
               }
       }
       callout_schedule(&sc->sc_tick, GPIOKEYS_POLL_INTERVAL);
}

static void
gpiokeys_task(void *priv)
{
       struct gpiokeys_key *key = priv;
       struct gpiokeys_softc *sc = key->key_sc;

       if (key->key_pswitch.smpsw_name) {
               sysmon_pswitch_event(&key->key_pswitch,
                   key->key_state ? PSWITCH_EVENT_PRESSED : PSWITCH_EVENT_RELEASED);
       } else if (sc->sc_enabled && sc->sc_wskbddev != NULL && key->key_usbcode != 0) {
               wskbd_input(sc->sc_wskbddev,
                   key->key_state ? WSCONS_EVENT_KEY_DOWN : WSCONS_EVENT_KEY_UP,
                   key->key_usbcode);
       }
}

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