/*      $Id: mpcsa_leds.c,v 1.10 2023/12/20 13:55:18 thorpej Exp $      */
/*      $NetBSD: mpcsa_leds.c,v 1.10 2023/12/20 13:55:18 thorpej Exp $  */

/*
* Copyright (c) 2007 Embedtronics Oy. All rights reserved.
*
* Based on arch/arm/ep93xx/epgpio.c,
* Copyright (c) 2005 HAMAJIMA Katsuomi. 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 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 AUTHOR 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mpcsa_leds.c,v 1.10 2023/12/20 13:55:18 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/lock.h>
#include <sys/gpio.h>
#include <dev/spi/spivar.h>
#include <dev/gpio/gpiovar.h>
#include <evbarm/mpcsa/mpcsa_leds_var.h>
#include <evbarm/mpcsa/mpcsa_io.h>
#include "gpio.h"
#if NGPIO > 0
#include <sys/gpio.h>
#endif
#include "locators.h"

#ifdef MPCSA_LEDS_DEBUG
int mpcsa_leds_debug = MPCSA_LEDS_DEBUG;
#define DPRINTFN(n,x)           if (mpcsa_leds_debug>(n)) printf x;
#else
#define DPRINTFN(n,x)
#endif

#define MPCSA_LEDS_NPINS                16
#define LEDS_UPDATE_INTERVAL            100     /* update interval in milliseconds */

enum {
 LMODE_NORMAL,                                 /* normal mode */
 LMODE_COMM,                                   /* communication mode */
 LMODE_BLINK                                   /* blink mode */
};

typedef struct led_state {
       int                     l_mode;         /* current command */
       union {
               struct {
                       int     l_conn_cnt;     /* connection count */
                       int     l_comm_cnt;     /* comm/pkt count */
               };
               struct {
                       int     l_blink_int;    /* blink interval */
                       int     l_blink_cnt;    /* blink counter */
               };
       };
} led_state_t;

struct mpcsa_leds_softc {
       struct spi_handle       *sc_sh;

#if NGPIO > 0
       struct gpio_chipset_tag sc_gpio_chipset;
       gpio_pin_t              sc_pins[MPCSA_LEDS_NPINS];
#endif

       callout_t               sc_c;
       led_state_t             sc_leds[MPCSA_LEDS_NPINS];
       uint16_t                sc_pinstate;

       struct spi_chunk        sc_spi_chunk;
       struct spi_transfer     sc_spi_transfer;
};

static int mpcsa_leds_match(device_t , cfdata_t , void *);
static void mpcsa_leds_attach(device_t , device_t , void *);
static void mpcsa_leds_timer(void *aux);

#if NGPIO > 0
static int mpcsa_ledsbus_print(void *, const char *);
static int mpcsa_leds_pin_read(void *, int);
static void mpcsa_leds_pin_write(void *, int, int);
static void mpcsa_leds_pin_ctl(void *, int, int);
#endif

#if 0
static int mpcsa_leds_search(device_t , cfdata_t , const int *, void *);
static int mpcsa_leds_print(void *, const char *);
#endif

CFATTACH_DECL_NEW(mpcsa_leds, sizeof(struct mpcsa_leds_softc),
             mpcsa_leds_match, mpcsa_leds_attach, NULL, NULL);

static struct mpcsa_leds_softc *mpcsa_leds_sc;

static int
mpcsa_leds_match(device_t parent, cfdata_t match, void *aux)
{

       if (strcmp(match->cf_name, "mpcsa_leds"))
               return 0;

       return 2;
}

static void
mpcsa_leds_attach(device_t parent, device_t self, void *aux)
{
       struct mpcsa_leds_softc *sc = device_private(self);
       struct spi_attach_args *sa = aux;
#if NGPIO > 0
       struct gpiobus_attach_args gba;
#endif
       int n;
       int error;

       aprint_naive(": output buffer\n");
       aprint_normal(": 74HC595 or compatible shift register(s)\n");

       error = spi_configure(self, sa->sa_handle, SPI_MODE_0,
           SPI_FREQ_MHz(10));
       if (error) {
               return;
       }

       sc->sc_sh = sa->sa_handle;
       sc->sc_pinstate = 0xffff;
       callout_init(&sc->sc_c, 0);

#if NGPIO > 0
       /* initialize and attach gpio(4) */
       for (n = 0; n < MPCSA_LEDS_NPINS; n++) {
               sc->sc_pins[n].pin_num = n;
               sc->sc_pins[n].pin_caps = (GPIO_PIN_OUTPUT
                                          | GPIO_PIN_PUSHPULL);
               sc->sc_pins[n].pin_flags = GPIO_PIN_OUTPUT | GPIO_PIN_LOW;
       }

       sc->sc_gpio_chipset.gp_cookie = sc;
       sc->sc_gpio_chipset.gp_pin_read = mpcsa_leds_pin_read;
       sc->sc_gpio_chipset.gp_pin_write = mpcsa_leds_pin_write;
       sc->sc_gpio_chipset.gp_pin_ctl = mpcsa_leds_pin_ctl;
       gba.gba_gc = &sc->sc_gpio_chipset;
       gba.gba_pins = sc->sc_pins;
       gba.gba_npins = MPCSA_LEDS_NPINS;
       config_found(self, &gba, mpcsa_ledsbus_print, CFARGS_NONE);
#endif

       /* attach device */
//      config_search_ia(mpcsa_leds_search, self, "mpcsa_leds", mpcsa_leds_print);

       /* update leds ten times a second or so */
       mpcsa_leds_sc = sc; // @@@@
       sc->sc_spi_transfer.st_flags = SPI_F_DONE;
       callout_reset(&sc->sc_c, mstohz(LEDS_UPDATE_INTERVAL), mpcsa_leds_timer, sc);

       mpcsa_blink_led(LED_HB, 500);
}




#if NGPIO > 0
static int
mpcsa_ledsbus_print(void *aux, const char *name)
{
       gpiobus_print(aux, name);
       return (UNCONF);
}


static int
mpcsa_leds_pin_read(void *arg, int pin)
{
       struct mpcsa_leds_softc *sc = arg;
       pin %= MPCSA_LEDS_NPINS;
       return (sc->sc_pinstate & htobe16(1U << pin)) ? 1 : 0;
}

static void
mpcsa_leds_pin_write(void *arg, int pin, int val)
{
       struct mpcsa_leds_softc *sc = arg;
       int s;

       pin %= MPCSA_LEDS_NPINS;
       if (!sc->sc_pins[pin].pin_caps)
               return;

       s = splserial();
       if (val)
               sc->sc_pinstate |= htobe16(1U << pin);
       else
               sc->sc_pinstate &= htobe16(~(1U << pin));
       splx(s);

       if (spi_send(sc->sc_sh, 2, (const void *)&sc->sc_pinstate) != 0) {
               // @@@ do what? @@@
       }
}


static void
mpcsa_leds_pin_ctl(void *arg, int pin, int flags)
{
       struct mpcsa_leds_softc *sc = arg;

       pin %= MPCSA_LEDS_NPINS;
       if (!sc->sc_pins[pin].pin_caps)
               return;

       // hmm, I think there's nothing to do
}
#endif

static void mpcsa_leds_timer(void *aux)
{
       int n, s;
       struct mpcsa_leds_softc *sc = aux;
       uint16_t pins;

       callout_schedule(&sc->sc_c, mstohz(LEDS_UPDATE_INTERVAL));

       s = splserial();
       if (!(sc->sc_spi_transfer.st_flags & SPI_F_DONE)) {
               splx(s);
               return;
       }


       pins = be16toh(sc->sc_pinstate);

       for (n = 0; n < MPCSA_LEDS_NPINS; n++) {
               switch (sc->sc_leds[n].l_mode) {
               default:
                       continue;

               case LMODE_COMM:
                       if (sc->sc_leds[n].l_comm_cnt > 0) {
                               if (sc->sc_leds[n].l_comm_cnt < INFINITE_BLINK)
                                       sc->sc_leds[n].l_comm_cnt--;
                               else
                                       sc->sc_leds[n].l_comm_cnt ^= 1;
                       }
                       if ((sc->sc_leds[n].l_conn_cnt > 0) ^ (sc->sc_leds[n].l_comm_cnt & 1))
                               pins &= ~(1U << n);
                       else
                               pins |= (1U << n);
                       break;

               case LMODE_BLINK:
                       if (--sc->sc_leds[n].l_blink_cnt <= 0) {
                               pins ^= (1U << n);
                               sc->sc_leds[n].l_blink_cnt = sc->sc_leds[n].l_blink_int;
                       }
                       break;
               }
       }

       HTOBE16(pins);
       sc->sc_pinstate = pins;
       splx(s);

       spi_transfer_init(&sc->sc_spi_transfer);
       spi_chunk_init(&sc->sc_spi_chunk, 2, (const void *)&sc->sc_pinstate, NULL);
       spi_transfer_add(&sc->sc_spi_transfer, &sc->sc_spi_chunk);
       if (spi_transfer(sc->sc_sh, &sc->sc_spi_transfer) != 0) {
               /* an error occurred! */
       }
}

void mpcsa_comm_led(int num, int count)
{
       struct mpcsa_leds_softc *sc = mpcsa_leds_sc;
       if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) {
               return;
       }
       num--;
       count *= 2;
       int s = splserial();
       if (sc->sc_leds[num].l_mode != LMODE_COMM) {
               sc->sc_leds[num].l_mode = LMODE_COMM;
               sc->sc_leds[num].l_conn_cnt = 0;
               sc->sc_leds[num].l_comm_cnt = 0;
       }
       if (sc->sc_leds[num].l_comm_cnt < (count * 2 - 1))
               sc->sc_leds[num].l_comm_cnt += count;
       else if ((count * 2) < sc->sc_leds[num].l_comm_cnt)
               sc->sc_leds[num].l_comm_cnt = count * 2 - 2 - (sc->sc_leds[num].l_comm_cnt % 2);
       splx(s);
}

void mpcsa_conn_led(int num, int ok)
{
       struct mpcsa_leds_softc *sc = mpcsa_leds_sc;
       if (!sc || num < 1 || num > MPCSA_LEDS_NPINS)
               return;
       num--;
       int s = splserial();
       if (sc->sc_leds[num].l_mode != LMODE_COMM) {
               sc->sc_leds[num].l_mode = LMODE_COMM;
               sc->sc_leds[num].l_conn_cnt = 0;
               sc->sc_leds[num].l_comm_cnt = 0;
       }
       if (ok)
               sc->sc_leds[num].l_conn_cnt++;
       else
               sc->sc_leds[num].l_conn_cnt--;
       splx(s);
}

void mpcsa_blink_led(int num, int interval)
{
       struct mpcsa_leds_softc *sc = mpcsa_leds_sc;
       if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) {
               return;
       }
       interval = (interval + LEDS_UPDATE_INTERVAL + 1) / LEDS_UPDATE_INTERVAL;
       num--;
       int s = splserial();
       if (sc->sc_leds[num].l_mode != LMODE_COMM) {
               sc->sc_leds[num].l_mode = LMODE_BLINK;
               sc->sc_leds[num].l_blink_cnt = interval;
       }
       sc->sc_leds[num].l_blink_int = interval;
       splx(s);
}

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