freebsd-dev/sys/dev/gpio/gpiobus.c
Andriy Gapon 061b38cdcc gpiobus: provide a new hint, pin_list
"pin_list" allows to specify child pins as a list of pin numbers.
Existing hint "pins" serves the same purpose but with a 32-bit wide bit
mask.  One problem with that is that a controller can have more than 32
pins.  One example is amdgpio.  Also, a list of numbers is a little bit
more human friendly than a matching bit mask.  As a side note, it seems
that in FDT pins are typically specified by their numbers as well.

This commit also adds accessors for instance variables (IVARs) that
define the child pins.  My primary goal is to allow a child to be
configured programmatically rather than via hints (assuming that FDT is
not supported on a platform).  Also, while a child should not care about
specific pin numbers that are allocated to it, it could be interested in
how many were actually assigned to it.

While there, I removed "flags" instance variable.  It was unused.

Reviewed by:	mizhka
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D20459
2019-06-27 15:46:06 +00:00

998 lines
24 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
* 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#ifdef INTRNG
#include <sys/intr.h>
#endif
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <dev/gpio/gpiobusvar.h>
#include "gpiobus_if.h"
#undef GPIOBUS_DEBUG
#ifdef GPIOBUS_DEBUG
#define dprintf printf
#else
#define dprintf(x, arg...)
#endif
static void gpiobus_print_pins(struct gpiobus_ivar *, char *, size_t);
static int gpiobus_parse_pins(struct gpiobus_softc *, device_t, int);
static int gpiobus_probe(device_t);
static int gpiobus_attach(device_t);
static int gpiobus_detach(device_t);
static int gpiobus_suspend(device_t);
static int gpiobus_resume(device_t);
static void gpiobus_probe_nomatch(device_t, device_t);
static int gpiobus_print_child(device_t, device_t);
static int gpiobus_child_location_str(device_t, device_t, char *, size_t);
static int gpiobus_child_pnpinfo_str(device_t, device_t, char *, size_t);
static device_t gpiobus_add_child(device_t, u_int, const char *, int);
static void gpiobus_hinted_child(device_t, const char *, int);
/*
* GPIOBUS interface
*/
static int gpiobus_acquire_bus(device_t, device_t, int);
static void gpiobus_release_bus(device_t, device_t);
static int gpiobus_pin_setflags(device_t, device_t, uint32_t, uint32_t);
static int gpiobus_pin_getflags(device_t, device_t, uint32_t, uint32_t*);
static int gpiobus_pin_getcaps(device_t, device_t, uint32_t, uint32_t*);
static int gpiobus_pin_set(device_t, device_t, uint32_t, unsigned int);
static int gpiobus_pin_get(device_t, device_t, uint32_t, unsigned int*);
static int gpiobus_pin_toggle(device_t, device_t, uint32_t);
/*
* XXX -> Move me to better place - gpio_subr.c?
* Also, this function must be changed when interrupt configuration
* data will be moved into struct resource.
*/
#ifdef INTRNG
struct resource *
gpio_alloc_intr_resource(device_t consumer_dev, int *rid, u_int alloc_flags,
gpio_pin_t pin, uint32_t intr_mode)
{
u_int irq;
struct intr_map_data_gpio *gpio_data;
struct resource *res;
gpio_data = (struct intr_map_data_gpio *)intr_alloc_map_data(
INTR_MAP_DATA_GPIO, sizeof(*gpio_data), M_WAITOK | M_ZERO);
gpio_data->gpio_pin_num = pin->pin;
gpio_data->gpio_pin_flags = pin->flags;
gpio_data->gpio_intr_mode = intr_mode;
irq = intr_map_irq(pin->dev, 0, (struct intr_map_data *)gpio_data);
res = bus_alloc_resource(consumer_dev, SYS_RES_IRQ, rid, irq, irq, 1,
alloc_flags);
if (res == NULL) {
intr_free_intr_map_data((struct intr_map_data *)gpio_data);
return (NULL);
}
rman_set_virtual(res, gpio_data);
return (res);
}
#else
struct resource *
gpio_alloc_intr_resource(device_t consumer_dev, int *rid, u_int alloc_flags,
gpio_pin_t pin, uint32_t intr_mode)
{
return (NULL);
}
#endif
int
gpio_check_flags(uint32_t caps, uint32_t flags)
{
/* Filter unwanted flags. */
flags &= caps;
/* Cannot mix input/output together. */
if (flags & GPIO_PIN_INPUT && flags & GPIO_PIN_OUTPUT)
return (EINVAL);
/* Cannot mix pull-up/pull-down together. */
if (flags & GPIO_PIN_PULLUP && flags & GPIO_PIN_PULLDOWN)
return (EINVAL);
return (0);
}
static void
gpiobus_print_pins(struct gpiobus_ivar *devi, char *buf, size_t buflen)
{
char tmp[128];
int i, range_start, range_stop, need_coma;
if (devi->npins == 0)
return;
need_coma = 0;
range_start = range_stop = devi->pins[0];
for (i = 1; i < devi->npins; i++) {
if (devi->pins[i] != (range_stop + 1)) {
if (need_coma)
strlcat(buf, ",", buflen);
memset(tmp, 0, sizeof(tmp));
if (range_start != range_stop)
snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
range_start, range_stop);
else
snprintf(tmp, sizeof(tmp) - 1, "%d",
range_start);
strlcat(buf, tmp, buflen);
range_start = range_stop = devi->pins[i];
need_coma = 1;
}
else
range_stop++;
}
if (need_coma)
strlcat(buf, ",", buflen);
memset(tmp, 0, sizeof(tmp));
if (range_start != range_stop)
snprintf(tmp, sizeof(tmp) - 1, "%d-%d",
range_start, range_stop);
else
snprintf(tmp, sizeof(tmp) - 1, "%d",
range_start);
strlcat(buf, tmp, buflen);
}
device_t
gpiobus_attach_bus(device_t dev)
{
device_t busdev;
busdev = device_add_child(dev, "gpiobus", -1);
if (busdev == NULL)
return (NULL);
if (device_add_child(dev, "gpioc", -1) == NULL) {
device_delete_child(dev, busdev);
return (NULL);
}
#ifdef FDT
ofw_gpiobus_register_provider(dev);
#endif
bus_generic_attach(dev);
return (busdev);
}
int
gpiobus_detach_bus(device_t dev)
{
int err;
#ifdef FDT
ofw_gpiobus_unregister_provider(dev);
#endif
err = bus_generic_detach(dev);
if (err != 0)
return (err);
return (device_delete_children(dev));
}
int
gpiobus_init_softc(device_t dev)
{
struct gpiobus_softc *sc;
sc = GPIOBUS_SOFTC(dev);
sc->sc_busdev = dev;
sc->sc_dev = device_get_parent(dev);
sc->sc_intr_rman.rm_type = RMAN_ARRAY;
sc->sc_intr_rman.rm_descr = "GPIO Interrupts";
if (rman_init(&sc->sc_intr_rman) != 0 ||
rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0)
panic("%s: failed to set up rman.", __func__);
if (GPIO_PIN_MAX(sc->sc_dev, &sc->sc_npins) != 0)
return (ENXIO);
KASSERT(sc->sc_npins >= 0, ("GPIO device with no pins"));
/* Pins = GPIO_PIN_MAX() + 1 */
sc->sc_npins++;
sc->sc_pins = malloc(sizeof(*sc->sc_pins) * sc->sc_npins, M_DEVBUF,
M_NOWAIT | M_ZERO);
if (sc->sc_pins == NULL)
return (ENOMEM);
/* Initialize the bus lock. */
GPIOBUS_LOCK_INIT(sc);
return (0);
}
int
gpiobus_alloc_ivars(struct gpiobus_ivar *devi)
{
/* Allocate pins and flags memory. */
devi->pins = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF,
M_NOWAIT | M_ZERO);
if (devi->pins == NULL)
return (ENOMEM);
return (0);
}
void
gpiobus_free_ivars(struct gpiobus_ivar *devi)
{
if (devi->pins) {
free(devi->pins, M_DEVBUF);
devi->pins = NULL;
}
devi->npins = 0;
}
int
gpiobus_acquire_pin(device_t bus, uint32_t pin)
{
struct gpiobus_softc *sc;
sc = device_get_softc(bus);
/* Consistency check. */
if (pin >= sc->sc_npins) {
device_printf(bus,
"invalid pin %d, max: %d\n", pin, sc->sc_npins - 1);
return (-1);
}
/* Mark pin as mapped and give warning if it's already mapped. */
if (sc->sc_pins[pin].mapped) {
device_printf(bus, "warning: pin %d is already mapped\n", pin);
return (-1);
}
sc->sc_pins[pin].mapped = 1;
return (0);
}
/* Release mapped pin */
int
gpiobus_release_pin(device_t bus, uint32_t pin)
{
struct gpiobus_softc *sc;
sc = device_get_softc(bus);
/* Consistency check. */
if (pin >= sc->sc_npins) {
device_printf(bus,
"gpiobus_acquire_pin: invalid pin %d, max=%d\n",
pin, sc->sc_npins - 1);
return (-1);
}
if (!sc->sc_pins[pin].mapped) {
device_printf(bus, "gpiobus_acquire_pin: pin %d is not mapped\n", pin);
return (-1);
}
sc->sc_pins[pin].mapped = 0;
return (0);
}
static int
gpiobus_acquire_child_pins(device_t dev, device_t child)
{
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
int i;
for (i = 0; i < devi->npins; i++) {
/* Reserve the GPIO pin. */
if (gpiobus_acquire_pin(dev, devi->pins[i]) != 0) {
device_printf(child, "cannot acquire pin %d\n",
devi->pins[i]);
while (--i >= 0) {
(void)gpiobus_release_pin(dev,
devi->pins[i]);
}
gpiobus_free_ivars(devi);
return (EBUSY);
}
}
for (i = 0; i < devi->npins; i++) {
/* Use the child name as pin name. */
GPIOBUS_PIN_SETNAME(dev, devi->pins[i],
device_get_nameunit(child));
}
return (0);
}
static int
gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask)
{
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
int i, npins;
npins = 0;
for (i = 0; i < 32; i++) {
if (mask & (1 << i))
npins++;
}
if (npins == 0) {
device_printf(child, "empty pin mask\n");
return (EINVAL);
}
devi->npins = npins;
if (gpiobus_alloc_ivars(devi) != 0) {
device_printf(child, "cannot allocate device ivars\n");
return (EINVAL);
}
npins = 0;
for (i = 0; i < 32; i++) {
if ((mask & (1 << i)) == 0)
continue;
devi->pins[npins++] = i;
}
if (gpiobus_acquire_child_pins(sc->sc_busdev, child) != 0)
return (EINVAL);
return (0);
}
static int
gpiobus_parse_pin_list(struct gpiobus_softc *sc, device_t child,
const char *pins)
{
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
const char *p;
char *endp;
unsigned long pin;
int i, npins;
npins = 0;
p = pins;
for (;;) {
pin = strtoul(p, &endp, 0);
if (endp == p)
break;
npins++;
if (*endp == '\0')
break;
p = endp + 1;
}
if (*endp != '\0') {
device_printf(child, "garbage in the pin list: %s\n", endp);
return (EINVAL);
}
if (npins == 0) {
device_printf(child, "empty pin list\n");
return (EINVAL);
}
devi->npins = npins;
if (gpiobus_alloc_ivars(devi) != 0) {
device_printf(child, "cannot allocate device ivars\n");
return (EINVAL);
}
i = 0;
p = pins;
for (;;) {
pin = strtoul(p, &endp, 0);
devi->pins[i] = pin;
if (*endp == '\0')
break;
i++;
p = endp + 1;
}
if (gpiobus_acquire_child_pins(sc->sc_busdev, child) != 0)
return (EINVAL);
return (0);
}
static int
gpiobus_probe(device_t dev)
{
device_set_desc(dev, "GPIO bus");
return (BUS_PROBE_GENERIC);
}
static int
gpiobus_attach(device_t dev)
{
int err;
err = gpiobus_init_softc(dev);
if (err != 0)
return (err);
/*
* Get parent's pins and mark them as unmapped
*/
bus_generic_probe(dev);
bus_enumerate_hinted_children(dev);
return (bus_generic_attach(dev));
}
/*
* Since this is not a self-enumerating bus, and since we always add
* children in attach, we have to always delete children here.
*/
static int
gpiobus_detach(device_t dev)
{
struct gpiobus_softc *sc;
struct gpiobus_ivar *devi;
device_t *devlist;
int i, err, ndevs;
sc = GPIOBUS_SOFTC(dev);
KASSERT(mtx_initialized(&sc->sc_mtx),
("gpiobus mutex not initialized"));
GPIOBUS_LOCK_DESTROY(sc);
if ((err = bus_generic_detach(dev)) != 0)
return (err);
if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
return (err);
for (i = 0; i < ndevs; i++) {
devi = GPIOBUS_IVAR(devlist[i]);
gpiobus_free_ivars(devi);
resource_list_free(&devi->rl);
free(devi, M_DEVBUF);
device_delete_child(dev, devlist[i]);
}
free(devlist, M_TEMP);
rman_fini(&sc->sc_intr_rman);
if (sc->sc_pins) {
for (i = 0; i < sc->sc_npins; i++) {
if (sc->sc_pins[i].name != NULL)
free(sc->sc_pins[i].name, M_DEVBUF);
sc->sc_pins[i].name = NULL;
}
free(sc->sc_pins, M_DEVBUF);
sc->sc_pins = NULL;
}
return (0);
}
static int
gpiobus_suspend(device_t dev)
{
return (bus_generic_suspend(dev));
}
static int
gpiobus_resume(device_t dev)
{
return (bus_generic_resume(dev));
}
static void
gpiobus_probe_nomatch(device_t dev, device_t child)
{
char pins[128];
struct gpiobus_ivar *devi;
devi = GPIOBUS_IVAR(child);
memset(pins, 0, sizeof(pins));
gpiobus_print_pins(devi, pins, sizeof(pins));
if (devi->npins > 1)
device_printf(dev, "<unknown device> at pins %s", pins);
else
device_printf(dev, "<unknown device> at pin %s", pins);
resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd");
printf("\n");
}
static int
gpiobus_print_child(device_t dev, device_t child)
{
char pins[128];
int retval = 0;
struct gpiobus_ivar *devi;
devi = GPIOBUS_IVAR(child);
memset(pins, 0, sizeof(pins));
retval += bus_print_child_header(dev, child);
if (devi->npins > 0) {
if (devi->npins > 1)
retval += printf(" at pins ");
else
retval += printf(" at pin ");
gpiobus_print_pins(devi, pins, sizeof(pins));
retval += printf("%s", pins);
}
resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd");
retval += bus_print_child_footer(dev, child);
return (retval);
}
static int
gpiobus_child_location_str(device_t bus, device_t child, char *buf,
size_t buflen)
{
struct gpiobus_ivar *devi;
devi = GPIOBUS_IVAR(child);
if (devi->npins > 1)
strlcpy(buf, "pins=", buflen);
else
strlcpy(buf, "pin=", buflen);
gpiobus_print_pins(devi, buf, buflen);
return (0);
}
static int
gpiobus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
size_t buflen)
{
*buf = '\0';
return (0);
}
static device_t
gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
{
device_t child;
struct gpiobus_ivar *devi;
child = device_add_child_ordered(dev, order, name, unit);
if (child == NULL)
return (child);
devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
if (devi == NULL) {
device_delete_child(dev, child);
return (NULL);
}
resource_list_init(&devi->rl);
device_set_ivars(child, devi);
return (child);
}
static void
gpiobus_hinted_child(device_t bus, const char *dname, int dunit)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus);
struct gpiobus_ivar *devi;
device_t child;
const char *pins;
int irq, pinmask;
child = BUS_ADD_CHILD(bus, 0, dname, dunit);
devi = GPIOBUS_IVAR(child);
if (resource_int_value(dname, dunit, "pins", &pinmask) == 0) {
if (gpiobus_parse_pins(sc, child, pinmask)) {
resource_list_free(&devi->rl);
free(devi, M_DEVBUF);
device_delete_child(bus, child);
return;
}
}
else if (resource_string_value(dname, dunit, "pin_list", &pins) == 0) {
if (gpiobus_parse_pin_list(sc, child, pins)) {
resource_list_free(&devi->rl);
free(devi, M_DEVBUF);
device_delete_child(bus, child);
return;
}
}
if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0)
device_printf(bus,
"warning: bus_set_resource() failed\n");
}
}
static int
gpiobus_set_resource(device_t dev, device_t child, int type, int rid,
rman_res_t start, rman_res_t count)
{
struct gpiobus_ivar *devi;
struct resource_list_entry *rle;
dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n",
__func__, dev, child, type, rid, (void *)(intptr_t)start, count);
devi = GPIOBUS_IVAR(child);
rle = resource_list_add(&devi->rl, type, rid, start,
start + count - 1, count);
if (rle == NULL)
return (ENXIO);
return (0);
}
static int
gpiobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct gpiobus_ivar *devi;
devi = GPIOBUS_IVAR(child);
switch (which) {
case GPIOBUS_IVAR_NPINS:
*result = devi->npins;
break;
case GPIOBUS_IVAR_PINS:
/* Children do not ever need to directly examine this. */
return (ENOTSUP);
default:
return (ENOENT);
}
return (0);
}
static int
gpiobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
struct gpiobus_ivar *devi;
const uint32_t *ptr;
int i;
devi = GPIOBUS_IVAR(child);
switch (which) {
case GPIOBUS_IVAR_NPINS:
/* GPIO ivars are set once. */
if (devi->npins != 0) {
return (EBUSY);
}
devi->npins = value;
if (gpiobus_alloc_ivars(devi) != 0) {
device_printf(child, "cannot allocate device ivars\n");
devi->npins = 0;
return (ENOMEM);
}
break;
case GPIOBUS_IVAR_PINS:
ptr = (const uint32_t *)value;
for (i = 0; i < devi->npins; i++)
devi->pins[i] = ptr[i];
if (gpiobus_acquire_child_pins(dev, child) != 0)
return (EBUSY);
break;
default:
return (ENOENT);
}
return (0);
}
static struct resource *
gpiobus_alloc_resource(device_t bus, device_t child, int type, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct gpiobus_softc *sc;
struct resource *rv;
struct resource_list *rl;
struct resource_list_entry *rle;
int isdefault;
if (type != SYS_RES_IRQ)
return (NULL);
isdefault = (RMAN_IS_DEFAULT_RANGE(start, end) && count == 1);
rle = NULL;
if (isdefault) {
rl = BUS_GET_RESOURCE_LIST(bus, child);
if (rl == NULL)
return (NULL);
rle = resource_list_find(rl, type, *rid);
if (rle == NULL)
return (NULL);
if (rle->res != NULL)
panic("%s: resource entry is busy", __func__);
start = rle->start;
count = rle->count;
end = rle->end;
}
sc = device_get_softc(bus);
rv = rman_reserve_resource(&sc->sc_intr_rman, start, end, count, flags,
child);
if (rv == NULL)
return (NULL);
rman_set_rid(rv, *rid);
if ((flags & RF_ACTIVE) != 0 &&
bus_activate_resource(child, type, *rid, rv) != 0) {
rman_release_resource(rv);
return (NULL);
}
return (rv);
}
static int
gpiobus_release_resource(device_t bus __unused, device_t child, int type,
int rid, struct resource *r)
{
int error;
if (rman_get_flags(r) & RF_ACTIVE) {
error = bus_deactivate_resource(child, type, rid, r);
if (error)
return (error);
}
return (rman_release_resource(r));
}
static struct resource_list *
gpiobus_get_resource_list(device_t bus __unused, device_t child)
{
struct gpiobus_ivar *ivar;
ivar = GPIOBUS_IVAR(child);
return (&ivar->rl);
}
static int
gpiobus_acquire_bus(device_t busdev, device_t child, int how)
{
struct gpiobus_softc *sc;
sc = device_get_softc(busdev);
GPIOBUS_ASSERT_UNLOCKED(sc);
GPIOBUS_LOCK(sc);
if (sc->sc_owner != NULL) {
if (sc->sc_owner == child)
panic("%s: %s still owns the bus.",
device_get_nameunit(busdev),
device_get_nameunit(child));
if (how == GPIOBUS_DONTWAIT) {
GPIOBUS_UNLOCK(sc);
return (EWOULDBLOCK);
}
while (sc->sc_owner != NULL)
mtx_sleep(sc, &sc->sc_mtx, 0, "gpiobuswait", 0);
}
sc->sc_owner = child;
GPIOBUS_UNLOCK(sc);
return (0);
}
static void
gpiobus_release_bus(device_t busdev, device_t child)
{
struct gpiobus_softc *sc;
sc = device_get_softc(busdev);
GPIOBUS_ASSERT_UNLOCKED(sc);
GPIOBUS_LOCK(sc);
if (sc->sc_owner == NULL)
panic("%s: %s releasing unowned bus.",
device_get_nameunit(busdev),
device_get_nameunit(child));
if (sc->sc_owner != child)
panic("%s: %s trying to release bus owned by %s",
device_get_nameunit(busdev),
device_get_nameunit(child),
device_get_nameunit(sc->sc_owner));
sc->sc_owner = NULL;
wakeup(sc);
GPIOBUS_UNLOCK(sc);
}
static int
gpiobus_pin_setflags(device_t dev, device_t child, uint32_t pin,
uint32_t flags)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
uint32_t caps;
if (pin >= devi->npins)
return (EINVAL);
if (GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], &caps) != 0)
return (EINVAL);
if (gpio_check_flags(caps, flags) != 0)
return (EINVAL);
return (GPIO_PIN_SETFLAGS(sc->sc_dev, devi->pins[pin], flags));
}
static int
gpiobus_pin_getflags(device_t dev, device_t child, uint32_t pin,
uint32_t *flags)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
if (pin >= devi->npins)
return (EINVAL);
return GPIO_PIN_GETFLAGS(sc->sc_dev, devi->pins[pin], flags);
}
static int
gpiobus_pin_getcaps(device_t dev, device_t child, uint32_t pin,
uint32_t *caps)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
if (pin >= devi->npins)
return (EINVAL);
return GPIO_PIN_GETCAPS(sc->sc_dev, devi->pins[pin], caps);
}
static int
gpiobus_pin_set(device_t dev, device_t child, uint32_t pin,
unsigned int value)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
if (pin >= devi->npins)
return (EINVAL);
return GPIO_PIN_SET(sc->sc_dev, devi->pins[pin], value);
}
static int
gpiobus_pin_get(device_t dev, device_t child, uint32_t pin,
unsigned int *value)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
if (pin >= devi->npins)
return (EINVAL);
return GPIO_PIN_GET(sc->sc_dev, devi->pins[pin], value);
}
static int
gpiobus_pin_toggle(device_t dev, device_t child, uint32_t pin)
{
struct gpiobus_softc *sc = GPIOBUS_SOFTC(dev);
struct gpiobus_ivar *devi = GPIOBUS_IVAR(child);
if (pin >= devi->npins)
return (EINVAL);
return GPIO_PIN_TOGGLE(sc->sc_dev, devi->pins[pin]);
}
static int
gpiobus_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct gpiobus_softc *sc;
sc = GPIOBUS_SOFTC(dev);
if (pin > sc->sc_npins)
return (EINVAL);
/* Did we have a name for this pin ? */
if (sc->sc_pins[pin].name != NULL) {
memcpy(name, sc->sc_pins[pin].name, GPIOMAXNAME);
return (0);
}
/* Return the default pin name. */
return (GPIO_PIN_GETNAME(device_get_parent(dev), pin, name));
}
static int
gpiobus_pin_setname(device_t dev, uint32_t pin, const char *name)
{
struct gpiobus_softc *sc;
sc = GPIOBUS_SOFTC(dev);
if (pin > sc->sc_npins)
return (EINVAL);
if (name == NULL)
return (EINVAL);
/* Save the pin name. */
if (sc->sc_pins[pin].name == NULL)
sc->sc_pins[pin].name = malloc(GPIOMAXNAME, M_DEVBUF,
M_WAITOK | M_ZERO);
strlcpy(sc->sc_pins[pin].name, name, GPIOMAXNAME);
return (0);
}
static device_method_t gpiobus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, gpiobus_probe),
DEVMETHOD(device_attach, gpiobus_attach),
DEVMETHOD(device_detach, gpiobus_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, gpiobus_suspend),
DEVMETHOD(device_resume, gpiobus_resume),
/* Bus interface */
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_config_intr, bus_generic_config_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_set_resource, gpiobus_set_resource),
DEVMETHOD(bus_alloc_resource, gpiobus_alloc_resource),
DEVMETHOD(bus_release_resource, gpiobus_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_get_resource_list, gpiobus_get_resource_list),
DEVMETHOD(bus_add_child, gpiobus_add_child),
DEVMETHOD(bus_probe_nomatch, gpiobus_probe_nomatch),
DEVMETHOD(bus_print_child, gpiobus_print_child),
DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str),
DEVMETHOD(bus_child_location_str, gpiobus_child_location_str),
DEVMETHOD(bus_hinted_child, gpiobus_hinted_child),
DEVMETHOD(bus_read_ivar, gpiobus_read_ivar),
DEVMETHOD(bus_write_ivar, gpiobus_write_ivar),
/* GPIO protocol */
DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus),
DEVMETHOD(gpiobus_release_bus, gpiobus_release_bus),
DEVMETHOD(gpiobus_pin_getflags, gpiobus_pin_getflags),
DEVMETHOD(gpiobus_pin_getcaps, gpiobus_pin_getcaps),
DEVMETHOD(gpiobus_pin_setflags, gpiobus_pin_setflags),
DEVMETHOD(gpiobus_pin_get, gpiobus_pin_get),
DEVMETHOD(gpiobus_pin_set, gpiobus_pin_set),
DEVMETHOD(gpiobus_pin_toggle, gpiobus_pin_toggle),
DEVMETHOD(gpiobus_pin_getname, gpiobus_pin_getname),
DEVMETHOD(gpiobus_pin_setname, gpiobus_pin_setname),
DEVMETHOD_END
};
driver_t gpiobus_driver = {
"gpiobus",
gpiobus_methods,
sizeof(struct gpiobus_softc)
};
devclass_t gpiobus_devclass;
EARLY_DRIVER_MODULE(gpiobus, gpio, gpiobus_driver, gpiobus_devclass, 0, 0,
BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(gpiobus, 1);