/*      $NetBSD: j720pwr.c,v 1.7 2021/08/07 16:18:53 thorpej Exp $      */

/*-
* Copyright (c) 2002, 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Emmanuel Dreyfus and Peter Postma.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/* Jornada 720 power management. */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: j720pwr.c,v 1.7 2021/08/07 16:18:53 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/device.h>

#include <dev/apm/apmbios.h>

#include <machine/config_hook.h>
#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <arm/sa11x0/sa11x0_var.h>
#include <arm/sa11x0/sa11x0_gpioreg.h>
#include <arm/sa11x0/sa11x0_ppcreg.h>
#include <arm/sa11x0/sa11x0_sspreg.h>

#include <hpcarm/dev/j720sspvar.h>

#ifdef DEBUG
#define DPRINTF(arg)    aprint_normal arg
#else
#define DPRINTF(arg)    /* nothing */
#endif

#define arraysize(ary)  (sizeof(ary) / sizeof(ary[0]))

struct j720pwr_softc {
       device_t                sc_dev;

       struct j720ssp_softc    *sc_ssp;

       volatile int            sc_state;
#define J720PWR_POWEROFF        0x01
#define J720PWR_SLEEPING        0x02
};

static int      j720pwr_match(device_t, cfdata_t, void *);
static void     j720pwr_attach(device_t, device_t, void *);

static void     j720pwr_sleep(void *);
static int      j720pwr_suspend_hook(void *, int, long, void *);
static int      j720pwr_event_hook(void *, int, long, void *);
static int      j720pwr_apm_getpower_hook(void *, int, long, void *);
static int      j720pwr_get_battery(struct j720pwr_softc *);
static int      j720pwr_get_ac_status(struct j720pwr_softc *);
static int      j720pwr_get_charge_status(struct j720pwr_softc *);

static const struct {
       int     percent;
       int     value;
       int     state;
} battery_table[] = {
       { 100,  670,    APM_BATT_FLAG_HIGH      },
       {  90,  660,    APM_BATT_FLAG_HIGH      },
       {  80,  650,    APM_BATT_FLAG_HIGH      },
       {  70,  640,    APM_BATT_FLAG_HIGH      },
       {  60,  630,    APM_BATT_FLAG_HIGH      },
       {  50,  620,    APM_BATT_FLAG_HIGH      },
       {  40,  605,    APM_BATT_FLAG_LOW       },
       {  30,  580,    APM_BATT_FLAG_LOW       },
       {  20,  545,    APM_BATT_FLAG_LOW       },
       {  10,  500,    APM_BATT_FLAG_CRITICAL  },
       {   0,  430,    APM_BATT_FLAG_CRITICAL  },
};

CFATTACH_DECL_NEW(j720pwr, sizeof(struct j720pwr_softc),
   j720pwr_match, j720pwr_attach, NULL, NULL);


static int
j720pwr_match(device_t parent, cfdata_t cf, void *aux)
{

       if (!platid_match(&platid, &platid_mask_MACH_HP_JORNADA_7XX))
               return 0;
       if (strcmp(cf->cf_name, "j720pwr") != 0)
               return 0;

       return 1;
}

static void
j720pwr_attach(device_t parent, device_t self, void *aux)
{
       struct j720pwr_softc *sc = device_private(self);
       extern void (*__sleep_func)(void *);
       extern void *__sleep_ctx;

       aprint_normal("\n");

       sc->sc_dev = self;
       sc->sc_ssp = device_private(parent);
       sc->sc_state = 0;

       /* Register apm sleep function. */
       __sleep_func = j720pwr_sleep;
       __sleep_ctx = sc;

       /* Battery status query hook. */
       config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_BATTERYVAL,
                   CONFIG_HOOK_EXCLUSIVE, j720pwr_apm_getpower_hook, sc);

       /* Battery charge status query hook. */
       config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_CHARGE,
                   CONFIG_HOOK_EXCLUSIVE, j720pwr_apm_getpower_hook, sc);

       /* AC status query hook. */
       config_hook(CONFIG_HOOK_GET, CONFIG_HOOK_ACADAPTER,
                   CONFIG_HOOK_EXCLUSIVE, j720pwr_apm_getpower_hook, sc);

       /* Suspend/resume button hook. */
       config_hook(CONFIG_HOOK_BUTTONEVENT,
                   CONFIG_HOOK_BUTTONEVENT_POWER,
                   CONFIG_HOOK_SHARE, j720pwr_suspend_hook, sc);

       /* Receive suspend/resume events. */
       config_hook(CONFIG_HOOK_PMEVENT,
                   CONFIG_HOOK_PMEVENT_HARDPOWER,
                   CONFIG_HOOK_SHARE, j720pwr_event_hook, sc);

       /* Attach hpcapm. */
       config_found(self, NULL, NULL, CFARGS_NONE);
}

static void
j720pwr_sleep(void *ctx)
{
       struct j720pwr_softc *sc = ctx;
       struct j720ssp_softc *ssp = sc->sc_ssp;
       uint32_t oldfer;

       /* Disable falling-edge detect on all GPIO ports, except keyboard. */
       oldfer = bus_space_read_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_FER);
       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_FER, 1 << 0);

       while (sc->sc_state & J720PWR_POWEROFF) {
               /*
                * Just sleep here until the poweroff bit gets unset.
                * We need to wait here because when machine_sleep() returns
                * hpcapm(4) assumes that we are "resuming".
                */
               (void)tsleep(&sc->sc_state, PWAIT, "j720slp", 0);
       }

       /* Restore previous FER value. */
       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_FER, oldfer);
}

static int
j720pwr_suspend_hook(void *ctx, int type, long id, void *msg)
{
       struct j720pwr_softc *sc = ctx;

       if (type != CONFIG_HOOK_BUTTONEVENT ||
           id != CONFIG_HOOK_BUTTONEVENT_POWER)
               return EINVAL;

       if ((sc->sc_state & (J720PWR_POWEROFF | J720PWR_SLEEPING)) == 0) {
               sc->sc_state |= J720PWR_POWEROFF;
       } else if ((sc->sc_state & (J720PWR_POWEROFF | J720PWR_SLEEPING)) ==
           (J720PWR_POWEROFF | J720PWR_SLEEPING)) {
               sc->sc_state &= ~J720PWR_POWEROFF;
               wakeup(&sc->sc_state);
       } else {
               DPRINTF(("j720pwr_suspend_hook: busy\n"));
               return EBUSY;
       }

       config_hook_call(CONFIG_HOOK_PMEVENT,
                        CONFIG_HOOK_PMEVENT_SUSPENDREQ, NULL);

       return 0;
}

static int
j720pwr_event_hook(void *ctx, int type, long id, void *msg)
{
       struct j720pwr_softc *sc = ctx;
       int event = (int)msg;

       if (type != CONFIG_HOOK_PMEVENT ||
           id != CONFIG_HOOK_PMEVENT_HARDPOWER)
               return EINVAL;

       switch (event) {
       case PWR_SUSPEND:
               sc->sc_state |= (J720PWR_SLEEPING | J720PWR_POWEROFF);
               break;
       case PWR_RESUME:
               sc->sc_state &= ~(J720PWR_SLEEPING | J720PWR_POWEROFF);
               break;
       default:
               return EINVAL;
       }

       return 0;
}

static int
j720pwr_apm_getpower_hook(void *ctx, int type, long id, void *msg)
{
       int * const pval = msg;
       int val, tmp, i, state = 0;

       if (type != CONFIG_HOOK_GET)
               return EINVAL;

       switch (id) {
       case CONFIG_HOOK_BATTERYVAL:
               val = j720pwr_get_battery(ctx);

               if (val != -1) {
                       for (i = 0; i < arraysize(battery_table); i++)
                               if (val > battery_table[i].value)
                                       break;
                       if (i == 0) {
                               /* Battery charge status is at maximum. */
                               *pval = 100;
                       } else {
                               /*
                                * Use linear interpolation to calculate
                                * the estimated charge status.
                                */
                               tmp = ((val - battery_table[i].value) * 100) /
                                   (battery_table[i - 1].value -
                                    battery_table[i].value);
                               *pval = battery_table[i].percent +
                                   ((battery_table[i - 1].percent -
                                     battery_table[i].percent) * tmp) / 100;
                       }
               } else {
                       /* Battery is absent. */
                       *pval = 0;
               }

               return 0;

       case CONFIG_HOOK_CHARGE:
               val = j720pwr_get_battery(ctx);

               if (val != -1) {
                       for (i = 1; i < arraysize(battery_table); i++) {
                               if (val > battery_table[i].value) {
                                       state = battery_table[i - 1].state;
                                       break;
                               }
                       }

                       if (j720pwr_get_charge_status(ctx) == 0)
                               state |= APM_BATT_FLAG_CHARGING;
               } else {
                       state = APM_BATT_FLAG_NO_SYSTEM_BATTERY;
               }

               *pval = state;
               return 0;

       case CONFIG_HOOK_ACADAPTER:
               *pval = j720pwr_get_ac_status(ctx) ? APM_AC_OFF : APM_AC_ON;

               return 0;
       }

       return EINVAL;
}

static int
j720pwr_get_battery(struct j720pwr_softc *sc)
{
       struct j720ssp_softc *ssp = sc->sc_ssp;
       int data, i, pmdata[3];

       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PCR, 0x2000000);

       if (j720ssp_readwrite(ssp, 1, 0xc0, &data, 500) < 0 || data != 0x11) {
               DPRINTF(("j720pwr_get_battery: no dummy received\n"));
               goto out;
       }

       for (i = 0; i < 3; i++) {
               if (j720ssp_readwrite(ssp, 0, 0x11, &pmdata[i], 100) < 0)
                       goto out;
       }

       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PSR, 0x2000000);

       pmdata[0] |= (pmdata[2] & 0x3) << 8;    /* Main battery. */
       pmdata[1] |= (pmdata[2] & 0xc) << 6;    /* Backup battery (unused). */

       DPRINTF(("j720pwr_get_battery: data[0]=%d data[1]=%d data[2]=%d\n",
           pmdata[0], pmdata[1], pmdata[2]));

       /* If bit 0 and 1 are both set, the main battery is absent. */
       if ((pmdata[2] & 3) == 3)
               return -1;

       return pmdata[0];

out:
       bus_space_write_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PSR, 0x2000000);

       /* reset SSP */
       bus_space_write_4(ssp->sc_iot, ssp->sc_ssph, SASSP_CR0, 0x307);
       delay(100);
       bus_space_write_4(ssp->sc_iot, ssp->sc_ssph, SASSP_CR0, 0x387);

       DPRINTF(("j720pwr_get_battery: error %x\n", data));
       return 0;
}

static int
j720pwr_get_ac_status(struct j720pwr_softc *sc)
{
       struct j720ssp_softc *ssp = sc->sc_ssp;
       uint32_t status;

       status = bus_space_read_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PLR);

       return status & (1 << 4);
}

static int
j720pwr_get_charge_status(struct j720pwr_softc *sc)
{
       struct j720ssp_softc *ssp = sc->sc_ssp;
       uint32_t status;

       status = bus_space_read_4(ssp->sc_iot, ssp->sc_gpioh, SAGPIO_PLR);

       return status & (1 << 26);
}

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