/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Tetsuya Uemura <t_uemura@macome.co.jp>
*
* 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>
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/callout.h>
#include <sys/eventhandler.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/queue.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/watchdog.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/aclocal.h>
#include <contrib/dev/acpica/include/actables.h>
#include <dev/acpica/acpivar.h>
/*
* Resource entry. Every instruction has the corresponding ACPI GAS but two or
* more instructions may access the same or adjacent register region(s). So we
* need to merge all the specified resources.
*
* res Resource when allocated.
* start Region start address.
* end Region end address + 1.
* rid Resource rid assigned when allocated.
* type ACPI resource type, SYS_RES_IOPORT or SYS_RES_MEMORY.
* link Next/previous resource entry.
*/
struct wdat_res {
struct resource *res;
uint64_t start;
uint64_t end;
int rid;
int type;
TAILQ_ENTRY(wdat_res) link;
};
/*
* Instruction entry. Every instruction itself is actually a single register
* read or write (and subsequent bit operation(s)).
* 0 or more instructions are tied to every watchdog action and once an action
* is kicked, the corresponding entries run sequentially.
*
* entry Permanent copy of ACPI_WDAT_ENTRY entry (sub-table).
* next Next instruction entry.
*/
struct wdat_instr {
ACPI_WDAT_ENTRY entry;
STAILQ_ENTRY(wdat_instr) next;
};
/*
* dev Watchdog device.
* wdat ACPI WDAT table, can be accessed until AcpiPutTable().
* default_timeout BIOS configured watchdog ticks to fire.
* timeout User configured timeout in millisecond or 0 if isn't set.
* max Max. supported watchdog ticks to be set.
* min Min. supported watchdog ticks to be set.
* period Milliseconds per watchdog tick.
* running True if this watchdog is running or false if stopped.
* stop_in_sleep False if this watchdog keeps counting down during sleep.
* ev_tag Tag for EVENTHANDLER_*().
* action Array of watchdog instruction sets, each indexed by action.
*/
struct wdatwd_softc {
device_t dev;
ACPI_TABLE_WDAT *wdat;
uint64_t default_timeout;
uint64_t timeout;
u_int max;
u_int min;
u_int period;
bool running;
bool stop_in_sleep;
eventhandler_tag ev_tag;
STAILQ_HEAD(, wdat_instr) action[ACPI_WDAT_ACTION_RESERVED];
TAILQ_HEAD(res_head, wdat_res) res;
};
#define WDATWD_VERBOSE_PRINTF(dev, ...) \
do { \
if (bootverbose) \
device_printf(dev, __VA_ARGS__); \
} while (0)
/*
* Do requested action.
*/
static int
wdatwd_action(const struct wdatwd_softc *sc, const u_int action, const uint64_t val, uint64_t *ret)
{
struct wdat_instr *wdat;
const char *rw = NULL;
ACPI_STATUS status;
if (STAILQ_EMPTY(&sc->action[action])) {
WDATWD_VERBOSE_PRINTF(sc->dev,
"action not supported: 0x%02x\n", action);
return (EOPNOTSUPP);
}
STAILQ_FOREACH(wdat, &sc->action[action], next) {
ACPI_GENERIC_ADDRESS *gas = &wdat->entry.RegisterRegion;
uint64_t x, y;
switch (wdat->entry.Instruction
& ~ACPI_WDAT_PRESERVE_REGISTER) {
case ACPI_WDAT_READ_VALUE:
status = AcpiRead(&x, gas);
if (ACPI_FAILURE(status)) {
rw = "AcpiRead";
goto fail;
}
x >>= gas->BitOffset;
x &= wdat->entry.Mask;
*ret = (x == wdat->entry.Value) ? 1 : 0;
break;
case ACPI_WDAT_READ_COUNTDOWN:
status = AcpiRead(&x, gas);
if (ACPI_FAILURE(status)) {
rw = "AcpiRead";
goto fail;
}
x >>= gas->BitOffset;
x &= wdat->entry.Mask;
*ret = x;
break;
case ACPI_WDAT_WRITE_VALUE:
x = wdat->entry.Value & wdat->entry.Mask;
x <<= gas->BitOffset;
if (wdat->entry.Instruction
& ACPI_WDAT_PRESERVE_REGISTER) {
status = AcpiRead(&y, gas);
if (ACPI_FAILURE(status)) {
rw = "AcpiRead";
goto fail;
}
y &= ~(wdat->entry.Mask << gas->BitOffset);
x |= y;
}
status = AcpiWrite(x, gas);
if (ACPI_FAILURE(status)) {
rw = "AcpiWrite";
goto fail;
}
break;
case ACPI_WDAT_WRITE_COUNTDOWN:
x = val & wdat->entry.Mask;
x <<= gas->BitOffset;
if (wdat->entry.Instruction
& ACPI_WDAT_PRESERVE_REGISTER) {
status = AcpiRead(&y, gas);
if (ACPI_FAILURE(status)) {
rw = "AcpiRead";
goto fail;
}
y &= ~(wdat->entry.Mask << gas->BitOffset);
x |= y;
}
status = AcpiWrite(x, gas);
if (ACPI_FAILURE(status)) {
rw = "AcpiWrite";
goto fail;
}
break;
default:
return (EINVAL);
}
}
return (0);
fail:
device_printf(sc->dev, "action: 0x%02x, %s() returned: %d\n",
action, rw, status);
return (ENXIO);
}
/*
* Reset the watchdog countdown.
*/
static int
wdatwd_reset_countdown(const struct wdatwd_softc *sc)
{
return wdatwd_action(sc, ACPI_WDAT_RESET, 0, NULL);
}
/*
* Set the watchdog countdown value. In WDAT specification, this is optional.
*/
static int
wdatwd_set_countdown(struct wdatwd_softc *sc, u_int cmd)
{
uint64_t timeout;
int e;
cmd &= WD_INTERVAL;
timeout = ((uint64_t) 1 << cmd) / 1000000 / sc->period;
if (timeout > sc->max)
timeout = sc->max;
else if (timeout < sc->min)
timeout = sc->min;
e = wdatwd_action(sc, ACPI_WDAT_SET_COUNTDOWN, timeout, NULL);
if (e == 0)
sc->timeout = timeout * sc->period;
return (e);
}
/*
* Get the watchdog current countdown value.
*/
static int
wdatwd_get_current_countdown(const struct wdatwd_softc *sc, uint64_t *timeout)
{
return wdatwd_action(sc, ACPI_WDAT_GET_CURRENT_COUNTDOWN, 0, timeout);
}
/*
* Get the watchdog countdown value the watchdog is configured to fire.
*/
static int
wdatwd_get_countdown(const struct wdatwd_softc *sc, uint64_t *timeout)
{
return wdatwd_action(sc, ACPI_WDAT_GET_COUNTDOWN, 0, timeout);
}
/*
* Set the watchdog to running state.
*/
static int
wdatwd_set_running(struct wdatwd_softc *sc)
{
int e;
e = wdatwd_action(sc, ACPI_WDAT_SET_RUNNING_STATE, 0, NULL);
if (e == 0)
sc->running = true;
return (e);
}
/*
* Set the watchdog to stopped state.
*/
static int
wdatwd_set_stop(struct wdatwd_softc *sc)
{
int e;
e = wdatwd_action(sc, ACPI_WDAT_SET_STOPPED_STATE, 0, NULL);
if (e == 0)
sc->running = false;
return (e);
}
/*
* Clear the watchdog's boot status if the current boot was caused by the
* watchdog firing.
*/
static int
wdatwd_clear_status(const struct wdatwd_softc *sc)
{
return wdatwd_action(sc, ACPI_WDAT_SET_STATUS, 0, NULL);
}
/*
* Set the watchdog to reboot when it is fired.
*/
static int
wdatwd_set_reboot(const struct wdatwd_softc *sc)
{
return wdatwd_action(sc, ACPI_WDAT_SET_REBOOT, 0, NULL);
}
/*
* Watchdog event handler.
*/
static void
wdatwd_event(void *private, u_int cmd, int *error)
{
struct wdatwd_softc *sc = private;
uint64_t cur[2], cnt[2];
bool run[2];
if (bootverbose) {
run[0] = sc->running;
if (wdatwd_get_countdown(sc, &cnt[0]) != 0)
cnt[0] = 0;
if (wdatwd_get_current_countdown(sc, &cur[0]) != 0)
cur[0] = 0;
}
if ((cmd & WD_INTERVAL) == 0)
wdatwd_set_stop(sc);
else {
if (!sc->running) {
/* ACPI_WDAT_SET_COUNTDOWN may not be implemented. */
wdatwd_set_countdown(sc, cmd);
wdatwd_set_running(sc);
/*
* In the first wdatwd_event() call, it sets the
* watchdog timeout to a considerably larger value such
* as 137 seconds, then kicks the watchdog to start
* counting down. Weirdly though, on a Dell R210 BIOS
* 1.12.0, a supplemental reset action must be
* triggered for the newly set timeout value to take
* effect. Without it, the watchdog fires 2.4 seconds
* after starting, where 2.4 seconds is its initially
* set timeout. This failure scenario is seen by first
* starting watchdogd(8) without wdatwd registered then
* kldload it. In steady state, watchdogd pats the
* watchdog every 10 or so seconds which is much longer
* than 2.4 seconds timeout.
*/
}
wdatwd_reset_countdown(sc);
}
if (bootverbose) {
run[1] = sc->running;
if (wdatwd_get_countdown(sc, &cnt[1]) != 0)
cnt[1] = 0;
if (wdatwd_get_current_countdown(sc, &cur[1]) != 0)
cur[1] = 0;
WDATWD_VERBOSE_PRINTF(sc->dev, "cmd: %u, sc->running: "
"%d -> %d, cnt: %llu -> %llu, cur: %llu -> %llu\n", cmd,
run[0], run[1],
(unsigned long long) cnt[0],
(unsigned long long) cnt[1],
(unsigned long long)cur[0],
(unsigned long long)cur[1]);
}
return;
}
static ssize_t
wdat_set_action(struct wdatwd_softc *sc, ACPI_WDAT_ENTRY *addr, ssize_t remaining)
{
ACPI_WDAT_ENTRY *entry = addr;
struct wdat_instr *wdat;
if (remaining < sizeof(ACPI_WDAT_ENTRY))
return (-EINVAL);
/* Skip actions beyond specification. */
if (entry->Action < nitems(sc->action)) {
wdat = malloc(sizeof(*wdat), M_DEVBUF, M_WAITOK | M_ZERO);
wdat->entry = *entry;
STAILQ_INSERT_TAIL(&sc->action[entry->Action], wdat, next);
}
return sizeof(ACPI_WDAT_ENTRY);
}
/*
* Transform every ACPI_WDAT_ENTRY to wdat_instr by calling wdat_set_action().
*/
static void
wdat_parse_action_table(struct wdatwd_softc *sc)
{
ACPI_TABLE_WDAT *wdat = sc->wdat;
ssize_t remaining, consumed;
char *cp;
remaining = wdat->Header.Length - sizeof(ACPI_TABLE_WDAT);
while (remaining > 0) {
cp = (char *)wdat + wdat->Header.Length - remaining;
consumed = wdat_set_action(sc, (ACPI_WDAT_ENTRY *)cp,
remaining);
if (consumed < 0) {
device_printf(sc->dev, "inconsistent WDAT table.\n");
break;
}
remaining -= consumed;
}
}
/*
* Decode the given GAS rr and set its type, start and end (actually end + 1)
* in the newly malloc()'ed res.
*/
static struct wdat_res *
wdat_alloc_region(ACPI_GENERIC_ADDRESS *rr)
{
struct wdat_res *res;
if (rr->AccessWidth < 1 || rr->AccessWidth > 4)
return (NULL);
res = malloc(sizeof(*res),
M_DEVBUF, M_WAITOK | M_ZERO);
if (res != NULL) {
res->start = rr->Address;
res->end = res->start + (1 << (rr->AccessWidth - 1));
res->type = rr->SpaceId;
}
return (res);
}
#define OVERLAP_NONE 0x0 // no overlap.
#define OVERLAP_SUBSET 0x1 // res2 is fully covered by res1.
#define OVERLAP_START 0x2 // the start of res2 is overlaped.
#define OVERLAP_END 0x4 // the end of res2 is overlapped.
/*
* Compare the given res1 and res2, and one of the above OVERLAP_* constant, or
* in case res2 is larger than res1 at both the start and the end,
* OVERLAP_START | OVERLAP_END, is returned.
*/
static int
wdat_compare_region(const struct wdat_res *res1, const struct wdat_res *res2)
{
int overlap;
/*
* a) both have different resource type. == OVERLAP_NONE
* b) res2 and res1 have no overlap. == OVERLAP_NONE
* c) res2 is fully covered by res1. == OVERLAP_SUBSET
* d) res2 and res1 overlap partially. == OVERLAP_START or
* OVERLAP_END
* e) res2 fully covers res1. == OVERLAP_START | OVERLAP_END
*/
overlap = 0;
if (res1->type != res2->type || res1->start > res2->end
|| res1->end < res2->start)
overlap |= OVERLAP_NONE;
else {
if (res1->start <= res2->start && res1->end >= res2->end)
overlap |= OVERLAP_SUBSET;
if (res1->start > res2->start)
overlap |= OVERLAP_START;
if (res1->end < res2->end)
overlap |= OVERLAP_END;
}
return (overlap);
}
/*
* Try to merge the given newres with the existing sc->res.
*/
static void
wdat_merge_region(struct wdatwd_softc *sc, struct wdat_res *newres)
{
struct wdat_res *res1, *res2, *res_safe, *res_itr;
int overlap;
if (TAILQ_EMPTY(&sc->res)) {
TAILQ_INSERT_HEAD(&sc->res, newres, link);
return;
}
overlap = OVERLAP_NONE;
TAILQ_FOREACH_SAFE(res1, &sc->res, link, res_safe) {
overlap = wdat_compare_region(res1, newres);
/* Try next res if newres isn't mergeable. */
if (overlap == OVERLAP_NONE)
continue;
/* This res fully covers newres. */
if (overlap == OVERLAP_SUBSET)
break;
/* Newres extends the existing res res1 to lower. */
if ((overlap & OVERLAP_START)) {
res1->start = newres->start;
res_itr = res1;
/* Try to merge more res if possible. */
while ((res2 = TAILQ_PREV(res_itr, res_head, link))) {
if (res1->type != res2->type) {
res_itr = res2;
continue;
} else if (res1->start <= res2->end) {
res1->start = res2->start;
TAILQ_REMOVE(&sc->res, res2, link);
free(res2, M_DEVBUF);
} else
break;
}
}
/* Newres extends the existing res res1 to upper. */
if ((overlap & OVERLAP_END)) {
res1->end = newres->end;
res_itr = res1;
/* Try to merge more res if possible. */
while ((res2 = TAILQ_NEXT(res_itr, link))) {
if (res1->type != res2->type) {
res_itr = res2;
continue;
} else if (res1->end >= res2->start) {
res1->end = res2->end;
TAILQ_REMOVE(&sc->res, res2, link);
free(res2, M_DEVBUF);
} else
break;
}
}
break;
}
/*
* If newres extends the existing res, newres must be free()'ed.
* Otherwise insert newres into sc->res at appropriate position
* (the lowest address region appears first).
*/
if (overlap > OVERLAP_NONE)
free(newres, M_DEVBUF);
else {
TAILQ_FOREACH(res1, &sc->res, link) {
if (newres->type != res1->type)
continue;
if (newres->start < res1->start) {
TAILQ_INSERT_BEFORE(res1, newres, link);
break;
}
}
if (res1 == NULL)
TAILQ_INSERT_TAIL(&sc->res, newres, link);
}
}
/*
* Release the already allocated resource.
*/
static void
wdat_release_resource(device_t dev)
{
struct wdatwd_softc *sc;
struct wdat_instr *wdat;
struct wdat_res *res;
int i;
sc = device_get_softc(dev);
TAILQ_FOREACH(res, &sc->res, link)
if (res->res != NULL) {
bus_release_resource(dev, res->type,
res->rid, res->res);
bus_delete_resource(dev, res->type, res->rid);
res->res = NULL;
}
for (i = 0; i < nitems(sc->action); ++i)
while (!STAILQ_EMPTY(&sc->action[i])) {
wdat = STAILQ_FIRST(&sc->action[i]);
STAILQ_REMOVE_HEAD(&sc->action[i], next);
free(wdat, M_DEVBUF);
}
while (!TAILQ_EMPTY(&sc->res)) {
res = TAILQ_FIRST(&sc->res);
TAILQ_REMOVE(&sc->res, res, link);
free(res, M_DEVBUF);
}
}
static int
wdatwd_probe(device_t dev)
{
ACPI_TABLE_WDAT *wdat;
ACPI_STATUS status;
/* Without WDAT table we have nothing to do. */
status = AcpiGetTable(ACPI_SIG_WDAT, 0, (ACPI_TABLE_HEADER **)&wdat);
if (ACPI_FAILURE(status))
return (ENXIO);
/* Try to allocate one resource and assume wdatwd is already attached
* if it fails. */
{
int type, rid = 0;
struct resource *res;
if (acpi_bus_alloc_gas(dev, &type, &rid,
&((ACPI_WDAT_ENTRY *)(wdat + 1))->RegisterRegion,
&res, 0))
return (ENXIO);
bus_release_resource(dev, type, rid, res);
bus_delete_resource(dev, type, rid);
}
WDATWD_VERBOSE_PRINTF(dev, "Flags: 0x%x, TimerPeriod: %d ms/cnt, "
"MaxCount: %d cnt (%d ms), MinCount: %d cnt (%d ms)\n",
(int)wdat->Flags, (int)wdat->TimerPeriod,
(int)wdat->MaxCount, (int)(wdat->MaxCount * wdat->TimerPeriod),
(int)wdat->MinCount, (int)(wdat->MinCount * wdat->TimerPeriod));
/* WDAT timer consistency. */
if ((wdat->TimerPeriod < 1) || (wdat->MinCount > wdat->MaxCount)) {
device_printf(dev, "inconsistent timer variables.\n");
return (EINVAL);
}
AcpiPutTable((ACPI_TABLE_HEADER *)wdat);
device_set_desc(dev, "ACPI WDAT Watchdog Interface");
return (BUS_PROBE_DEFAULT);
}
static int
wdatwd_attach(device_t dev)
{
struct wdatwd_softc *sc;
struct wdat_instr *wdat;
struct wdat_res *res;
struct sysctl_ctx_list *sctx;
struct sysctl_oid *soid;
ACPI_STATUS status;
int e, i, rid;
sc = device_get_softc(dev);
sc->dev = dev;
for (i = 0; i < nitems(sc->action); ++i)
STAILQ_INIT(&sc->action[i]);
/* Search and parse WDAT table. */
status = AcpiGetTable(ACPI_SIG_WDAT, 0,
(ACPI_TABLE_HEADER **)&sc->wdat);
if (ACPI_FAILURE(status))
return (ENXIO);
/* Parse watchdog variables. */
sc->period = sc->wdat->TimerPeriod;
sc->max = sc->wdat->MaxCount;
sc->min = sc->wdat->MinCount;
sc->stop_in_sleep = (sc->wdat->Flags & ACPI_WDAT_STOPPED)
? true : false;
/* Parse defined watchdog actions. */
wdat_parse_action_table(sc);
AcpiPutTable((ACPI_TABLE_HEADER *)sc->wdat);
/* Verbose logging. */
if (bootverbose) {
for (i = 0; i < nitems(sc->action); ++i)
STAILQ_FOREACH(wdat, &sc->action[i], next) {
WDATWD_VERBOSE_PRINTF(dev, "action: 0x%02x, "
"%s %s at 0x%llx (%d bit(s), offset %d bit(s))\n",
i,
wdat->entry.RegisterRegion.SpaceId
== ACPI_ADR_SPACE_SYSTEM_MEMORY
? "mem"
: wdat->entry.RegisterRegion.SpaceId
== ACPI_ADR_SPACE_SYSTEM_IO
? "io "
: "???",
wdat->entry.RegisterRegion.AccessWidth == 1
? "byte "
: wdat->entry.RegisterRegion.AccessWidth == 2
? "word "
: wdat->entry.RegisterRegion.AccessWidth == 3
? "dword"
: wdat->entry.RegisterRegion.AccessWidth == 4
? "qword"
: "undef",
(unsigned long long )
wdat->entry.RegisterRegion.Address,
wdat->entry.RegisterRegion.BitWidth,
wdat->entry.RegisterRegion.BitOffset);
}
}
/* Canonicalize the requested resources. */
TAILQ_INIT(&sc->res);
for (i = 0; i < nitems(sc->action); ++i)
STAILQ_FOREACH(wdat, &sc->action[i], next) {
res = wdat_alloc_region(&wdat->entry.RegisterRegion);
if (res == NULL)
goto fail;
wdat_merge_region(sc, res);
}
/* Resource allocation. */
rid = 0;
TAILQ_FOREACH(res, &sc->res, link) {
switch (res->type) {
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
res->type = SYS_RES_MEMORY;
break;
case ACPI_ADR_SPACE_SYSTEM_IO:
res->type = SYS_RES_IOPORT;
break;
default:
goto fail;
}
res->rid = rid++;
bus_set_resource(dev, res->type, res->rid,
res->start, res->end - res->start);
res->res = bus_alloc_resource_any(
dev, res->type, &res->rid, RF_ACTIVE);
if (res->res == NULL) {
bus_delete_resource(dev, res->type, res->rid);
device_printf(dev, "%s at 0x%llx (%lld byte(s)): "
"alloc' failed\n",
res->type == SYS_RES_MEMORY ? "mem" : "io ",
(unsigned long long )res->start,
(unsigned long long )(res->end - res->start));
goto fail;
}
WDATWD_VERBOSE_PRINTF(dev, "%s at 0x%llx (%lld byte(s)): "
"alloc'ed\n",
res->type == SYS_RES_MEMORY ? "mem" : "io ",
(unsigned long long )res->start,
(unsigned long long) (res->end - res->start));
}
/* Initialize the watchdog hardware. */
if (wdatwd_set_stop(sc) != 0)
goto fail;
if ((e = wdatwd_clear_status(sc)) && e != EOPNOTSUPP)
goto fail;
if ((e = wdatwd_set_reboot(sc)) && e != EOPNOTSUPP)
goto fail;
if ((e = wdatwd_get_countdown(sc, &sc->default_timeout))
&& e != EOPNOTSUPP)
goto fail;
WDATWD_VERBOSE_PRINTF(dev, "initialized.\n");
/* Some sysctls. Most of them should go to WDATWD_VERBOSE_PRINTF(). */
sctx = device_get_sysctl_ctx(dev);
soid = device_get_sysctl_tree(dev);
SYSCTL_ADD_U64(sctx, SYSCTL_CHILDREN(soid), OID_AUTO,
"timeout_default", CTLFLAG_RD, SYSCTL_NULL_U64_PTR,
sc->default_timeout * sc->period,
"The default watchdog timeout in millisecond.");
SYSCTL_ADD_BOOL(sctx, SYSCTL_CHILDREN(soid), OID_AUTO,
"timeout_configurable", CTLFLAG_RD, SYSCTL_NULL_BOOL_PTR,
STAILQ_EMPTY(&sc->action[ACPI_WDAT_SET_COUNTDOWN]) ? false : true,
"Whether the watchdog timeout is configurable or not.");
SYSCTL_ADD_U64(sctx, SYSCTL_CHILDREN(soid), OID_AUTO,
"timeout", CTLFLAG_RD, &sc->timeout, 0,
"The current watchdog timeout in millisecond. "
"If 0, the default timeout is used.");
SYSCTL_ADD_BOOL(sctx, SYSCTL_CHILDREN(soid), OID_AUTO,
"running", CTLFLAG_RD, &sc->running, 0,
"Whether the watchdog timer is running or not.");
sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, wdatwd_event, sc,
EVENTHANDLER_PRI_ANY);
WDATWD_VERBOSE_PRINTF(dev, "watchdog registered.\n");
return (0);
fail:
wdat_release_resource(dev);
return (ENXIO);
}
static int
wdatwd_detach(device_t dev)
{
struct wdatwd_softc *sc;
int e;
sc = device_get_softc(dev);
EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
e = wdatwd_set_stop(sc);
wdat_release_resource(dev);
return (e);
}
static int
wdatwd_suspend(device_t dev)
{
struct wdatwd_softc *sc;
sc = device_get_softc(dev);
if (!sc->stop_in_sleep)
return (0);
return wdatwd_set_stop(sc);
}
static int
wdatwd_resume(device_t dev)
{
struct wdatwd_softc *sc;
sc = device_get_softc(dev);
if (!sc->stop_in_sleep)
return (0);
return (wdatwd_reset_countdown(sc) || wdatwd_set_running(sc));
}
static device_method_t wdatwd_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, wdatwd_probe),
DEVMETHOD(device_attach, wdatwd_attach),
DEVMETHOD(device_detach, wdatwd_detach),
DEVMETHOD(device_shutdown, wdatwd_detach),
DEVMETHOD(device_suspend, wdatwd_suspend),
DEVMETHOD(device_resume, wdatwd_resume),
DEVMETHOD_END
};
static driver_t wdatwd_driver = {
"wdatwd",
wdatwd_methods,
sizeof(struct wdatwd_softc),
};
DRIVER_MODULE(wdatwd, acpi, wdatwd_driver, 0, 0);
MODULE_DEPEND(wdatwd, acpi, 1, 1, 1);