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|
/* $NetBSD: gpio.c,v 1.72 2022/12/13 21:50:43 jakllsch Exp $ */
/* $OpenBSD: gpio.c,v 1.6 2006/01/14 12:33:49 grange Exp $ */
/*
* Copyright (c) 2008, 2009, 2010, 2011 Marc Balmer <marc@msys.ch>
* Copyright (c) 2004, 2006 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef _KERNEL_OPT
#include "opt_fdt.h"
#endif
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: gpio.c,v 1.72 2022/12/13 21:50:43 jakllsch Exp $");
/*
* General Purpose Input/Output framework.
*/
#include <sys/param.h>
#include <sys/callout.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/kmem.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/queue.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <dev/gpio/gpiovar.h>
#ifdef FDT
#include <dev/fdt/fdtvar.h>
#endif
#include "ioconf.h"
#include "locators.h"
#ifdef GPIO_DEBUG
#define DPRINTFN(n, x) do { if (gpiodebug > (n)) printf x; } while (0)
int gpiodebug = 0;
#else
#define DPRINTFN(n, x)
#endif
#define DPRINTF(x) DPRINTFN(0, x)
struct gpio_softc {
device_t sc_dev;
gpio_chipset_tag_t sc_gc; /* GPIO controller */
gpio_pin_t *sc_pins; /* pins array */
int sc_npins; /* number of pins */
kmutex_t sc_mtx;
kcondvar_t sc_ioctl; /* ioctl in progress */
int sc_ioctl_busy; /* ioctl is busy */
kcondvar_t sc_attach; /* attach/detach in progress */
int sc_attach_busy;/* busy in attach/detach */
#ifdef COMPAT_50
LIST_HEAD(, gpio_dev) sc_devs; /* devices */
#endif
LIST_HEAD(, gpio_name) sc_names; /* named pins */
};
static int gpio_match(device_t, cfdata_t, void *);
int gpio_submatch(device_t, cfdata_t, const int *, void *);
static void gpio_attach(device_t, device_t, void *);
static int gpio_rescan(device_t, const char *, const int *);
static void gpio_childdetached(device_t, device_t);
static bool gpio_resume(device_t, const pmf_qual_t *);
static int gpio_detach(device_t, int);
static int gpio_search(device_t, cfdata_t, const int *, void *);
static int gpio_print(void *, const char *);
static int gpio_pinbyname(struct gpio_softc *, char *);
static int gpio_ioctl(struct gpio_softc *, u_long, void *, int,
struct lwp *);
#ifdef COMPAT_50
/* Old API */
static int gpio_ioctl_oapi(struct gpio_softc *, u_long, void *, int,
struct lwp *);
#endif
CFATTACH_DECL3_NEW(gpio, sizeof(struct gpio_softc),
gpio_match, gpio_attach, gpio_detach, NULL, gpio_rescan,
gpio_childdetached, DVF_DETACH_SHUTDOWN);
dev_type_open(gpioopen);
dev_type_close(gpioclose);
dev_type_ioctl(gpioioctl);
dev_type_ioctl(gpioioctl_locked);
const struct cdevsw gpio_cdevsw = {
.d_open = gpioopen,
.d_close = gpioclose,
.d_read = noread,
.d_write = nowrite,
.d_ioctl = gpioioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_flag = D_OTHER | D_MPSAFE
};
static int
gpio_match(device_t parent, cfdata_t cf, void *aux)
{
return 1;
}
int
gpio_submatch(device_t parent, cfdata_t cf, const int *ip, void *aux)
{
struct gpio_attach_args *ga = aux;
if (ga->ga_offset == -1)
return 0;
return strcmp(ga->ga_dvname, cf->cf_name) == 0;
}
static bool
gpio_resume(device_t self, const pmf_qual_t *qual)
{
struct gpio_softc *sc = device_private(self);
int pin;
for (pin = 0; pin < sc->sc_npins; pin++) {
gpiobus_pin_ctl(sc->sc_gc, pin, sc->sc_pins[pin].pin_flags);
gpiobus_pin_write(sc->sc_gc, pin, sc->sc_pins[pin].pin_state);
}
return true;
}
static void
gpio_childdetached(device_t self, device_t child)
{
#ifdef COMPAT_50
struct gpio_dev *gdev;
struct gpio_softc *sc;
int error;
/*
* gpio_childetached is serialized because it can be entered in
* different ways concurrently, e.g. via the GPIODETACH ioctl and
* drvctl(8) or modunload(8).
*/
sc = device_private(self);
error = 0;
mutex_enter(&sc->sc_mtx);
while (sc->sc_attach_busy) {
error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx);
if (error)
break;
}
if (!error)
sc->sc_attach_busy = 1;
mutex_exit(&sc->sc_mtx);
if (error)
return;
KERNEL_LOCK(1, NULL);
LIST_FOREACH(gdev, &sc->sc_devs, sc_next)
if (gdev->sc_dev == child) {
LIST_REMOVE(gdev, sc_next);
kmem_free(gdev, sizeof(struct gpio_dev));
break;
}
KERNEL_UNLOCK_ONE(NULL);
mutex_enter(&sc->sc_mtx);
sc->sc_attach_busy = 0;
cv_signal(&sc->sc_attach);
mutex_exit(&sc->sc_mtx);
#endif
}
static int
gpio_rescan(device_t self, const char *ifattr, const int *locators)
{
KERNEL_LOCK(1, NULL);
config_search(self, NULL,
CFARGS(.search = gpio_search));
KERNEL_UNLOCK_ONE(NULL);
return 0;
}
static const char *
gpio_pin_defname(struct gpio_softc *sc, int pin)
{
KASSERT(pin >= 0);
#ifdef FDT
devhandle_t devhandle = device_handle(sc->sc_dev);
if (devhandle_type(devhandle) == DEVHANDLE_TYPE_OF) {
return fdtbus_get_string_index(devhandle_to_of(devhandle),
"gpio-line-names", pin);
}
#endif /* FDT */
return NULL;
}
static void
gpio_attach(device_t parent, device_t self, void *aux)
{
struct gpio_softc *sc = device_private(self);
struct gpiobus_attach_args *gba = aux;
struct gpio_name *nm;
int pin;
sc->sc_dev = self;
sc->sc_gc = gba->gba_gc;
sc->sc_pins = gba->gba_pins;
sc->sc_npins = gba->gba_npins;
aprint_normal(": %d pins\n", sc->sc_npins);
aprint_naive("\n");
/* Configure default pin names */
for (pin = 0; pin < sc->sc_npins; pin++) {
const char *defname;
defname = gpio_pin_defname(sc, pin);
if (defname == NULL &&
sc->sc_pins[pin].pin_defname[0] != '\0') {
defname = sc->sc_pins[pin].pin_defname;
}
if (defname == NULL) {
continue;
}
nm = kmem_alloc(sizeof(*nm), KM_SLEEP);
strlcpy(nm->gp_name, defname, sizeof(nm->gp_name));
nm->gp_pin = pin;
LIST_INSERT_HEAD(&sc->sc_names, nm, gp_next);
}
if (!pmf_device_register(self, NULL, gpio_resume))
aprint_error_dev(self, "couldn't establish power handler\n");
mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_VM);
cv_init(&sc->sc_ioctl, "gpioctl");
cv_init(&sc->sc_attach, "gpioatch");
/*
* Attach all devices that can be connected to the GPIO pins
* described in the kernel configuration file.
*/
gpio_rescan(self, "gpio", NULL);
}
static int
gpio_detach(device_t self, int flags)
{
struct gpio_softc *sc;
int rc;
sc = device_private(self);
if ((rc = config_detach_children(self, flags)) != 0)
return rc;
mutex_destroy(&sc->sc_mtx);
cv_destroy(&sc->sc_ioctl);
#if 0
int maj, mn;
/* Locate the major number */
for (maj = 0; maj < nchrdev; maj++)
if (cdevsw[maj].d_open == gpioopen)
break;
/* Nuke the vnodes for any open instances (calls close) */
mn = device_unit(self);
vdevgone(maj, mn, mn, VCHR);
#endif
return 0;
}
static int
gpio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
struct gpio_attach_args ga;
size_t namlen;
ga.ga_gpio = device_private(parent);
ga.ga_offset = cf->cf_loc[GPIOCF_OFFSET];
ga.ga_mask = cf->cf_loc[GPIOCF_MASK];
ga.ga_flags = cf->cf_loc[GPIOCF_FLAG];
namlen = strlen(cf->cf_name) + 1;
ga.ga_dvname = kmem_alloc(namlen, KM_SLEEP);
strcpy(ga.ga_dvname, cf->cf_name);
if (config_probe(parent, cf, &ga))
config_attach(parent, cf, &ga, gpio_print, CFARGS_NONE);
kmem_free(ga.ga_dvname, namlen);
return 0;
}
int
gpio_print(void *aux, const char *pnp)
{
struct gpio_attach_args *ga = aux;
int i;
aprint_normal(" pins");
for (i = 0; i < 32; i++)
if (ga->ga_mask & (1 << i))
aprint_normal(" %d", ga->ga_offset + i);
return UNCONF;
}
int
gpiobus_print(void *aux, const char *pnp)
{
#if 0
struct gpiobus_attach_args *gba = aux;
#endif
if (pnp != NULL)
aprint_normal("gpiobus at %s", pnp);
return UNCONF;
}
void *
gpio_find_device(const char *name)
{
device_t gpio_dev;
gpio_dev = device_find_by_xname(name);
if (gpio_dev == NULL)
return NULL;
return device_private(gpio_dev);
}
const char *
gpio_get_name(void *gpio)
{
struct gpio_softc *sc = gpio;
return device_xname(sc->sc_dev);
}
/* return 1 if all pins can be mapped, 0 if not */
int
gpio_pin_can_map(void *gpio, int offset, uint32_t mask)
{
struct gpio_softc *sc = gpio;
int npins, pin, i;
npins = gpio_npins(mask);
if (npins > sc->sc_npins)
return 0;
for (npins = 0, i = 0; i < 32; i++)
if (mask & (1 << i)) {
pin = offset + i;
if (pin < 0 || pin >= sc->sc_npins)
return 0;
if (sc->sc_pins[pin].pin_mapped)
return 0;
}
return 1;
}
int
gpio_pin_map(void *gpio, int offset, uint32_t mask, struct gpio_pinmap *map)
{
struct gpio_softc *sc = gpio;
int npins, pin, i;
npins = gpio_npins(mask);
if (npins > sc->sc_npins)
return 1;
for (npins = 0, i = 0; i < 32; i++)
if (mask & (1 << i)) {
pin = offset + i;
if (pin < 0 || pin >= sc->sc_npins)
return 1;
if (sc->sc_pins[pin].pin_mapped)
return 1;
sc->sc_pins[pin].pin_mapped = 1;
map->pm_map[npins++] = pin;
}
map->pm_size = npins;
return 0;
}
void
gpio_pin_unmap(void *gpio, struct gpio_pinmap *map)
{
struct gpio_softc *sc = gpio;
int pin, i;
for (i = 0; i < map->pm_size; i++) {
pin = map->pm_map[i];
sc->sc_pins[pin].pin_mapped = 0;
}
}
int
gpio_pin_read(void *gpio, struct gpio_pinmap *map, int pin)
{
struct gpio_softc *sc = gpio;
return gpiobus_pin_read(sc->sc_gc, map->pm_map[pin]);
}
void
gpio_pin_write(void *gpio, struct gpio_pinmap *map, int pin, int value)
{
struct gpio_softc *sc = gpio;
gpiobus_pin_write(sc->sc_gc, map->pm_map[pin], value);
sc->sc_pins[map->pm_map[pin]].pin_state = value;
}
int
gpio_pin_get_conf(void *gpio, struct gpio_pinmap *map, int pin)
{
struct gpio_softc *sc = gpio;
int rv;
mutex_enter(&sc->sc_mtx);
rv = sc->sc_pins[map->pm_map[pin]].pin_flags;
mutex_exit(&sc->sc_mtx);
return (rv);
}
bool
gpio_pin_set_conf(void *gpio, struct gpio_pinmap *map, int pin, int flags)
{
struct gpio_softc *sc = gpio;
int checkflags = flags & GPIO_PIN_HWCAPS;
if ((sc->sc_pins[map->pm_map[pin]].pin_caps & checkflags) != checkflags)
return (false);
gpio_pin_ctl(gpio, map, pin, flags);
return (true);
}
void
gpio_pin_ctl(void *gpio, struct gpio_pinmap *map, int pin, int flags)
{
struct gpio_softc *sc = gpio;
/* loosey-goosey version of gpio_pin_set_conf(). */
mutex_enter(&sc->sc_mtx);
gpiobus_pin_ctl(sc->sc_gc, map->pm_map[pin], flags);
sc->sc_pins[map->pm_map[pin]].pin_flags = flags;
mutex_exit(&sc->sc_mtx);
}
int
gpio_pin_caps(void *gpio, struct gpio_pinmap *map, int pin)
{
struct gpio_softc *sc = gpio;
return sc->sc_pins[map->pm_map[pin]].pin_caps;
}
int
gpio_pin_intrcaps(void *gpio, struct gpio_pinmap *map, int pin)
{
struct gpio_softc *sc = gpio;
return sc->sc_pins[map->pm_map[pin]].pin_intrcaps;
}
static int
gpio_irqmode_sanitize(int irqmode)
{
int has_edge, has_level;
has_edge = irqmode & GPIO_INTR_EDGE_MASK;
has_level = irqmode & GPIO_INTR_LEVEL_MASK;
/* Must specify an interrupt mode. */
if ((irqmode & GPIO_INTR_MODE_MASK) == 0)
return (0);
/* Can't specify edge and level together */
if (has_level && has_edge)
return (0);
/* "Be liberal in what you accept..." */
if (has_edge) {
if (irqmode & GPIO_INTR_DOUBLE_EDGE) {
/* if DOUBLE is set, just pass through DOUBLE */
irqmode = (irqmode & ~GPIO_INTR_EDGE_MASK) |
GPIO_INTR_DOUBLE_EDGE;
} else if ((irqmode ^
(GPIO_INTR_POS_EDGE | GPIO_INTR_NEG_EDGE)) == 0) {
/* both POS and NEG set; treat as DOUBLE */
irqmode = (irqmode & ~GPIO_INTR_EDGE_MASK) |
GPIO_INTR_DOUBLE_EDGE;
}
} else {
/* Can't specify both levels together. */
if (has_level == GPIO_INTR_LEVEL_MASK)
return (0);
}
return (irqmode);
}
bool
gpio_pin_irqmode_issupported(void *gpio, struct gpio_pinmap *map,
int pin, int irqmode)
{
struct gpio_softc *sc = gpio;
int match;
irqmode = gpio_irqmode_sanitize(irqmode) & GPIO_INTR_MODE_MASK;
/* Make sure the pin can do what is being asked. */
match = sc->sc_pins[map->pm_map[pin]].pin_intrcaps & irqmode;
return (irqmode && irqmode == match);
}
void *
gpio_intr_establish(void *gpio, struct gpio_pinmap *map, int pin, int ipl,
int irqmode, int (*func)(void *), void *arg)
{
struct gpio_softc *sc = gpio;
if (sc->sc_gc->gp_intr_establish == NULL)
return (NULL);
irqmode = gpio_irqmode_sanitize(irqmode);
if (irqmode == 0)
return (NULL);
if (! gpio_pin_irqmode_issupported(gpio, map, pin, irqmode))
return (NULL);
/* XXX Right now, everything has to be at IPL_VM. */
if (ipl != IPL_VM)
return (NULL);
return ((*sc->sc_gc->gp_intr_establish)(sc->sc_gc->gp_cookie,
sc->sc_pins[map->pm_map[pin]].pin_num, ipl, irqmode, func, arg));
}
void
gpio_intr_disestablish(void *gpio, void *ih)
{
struct gpio_softc *sc = gpio;
if (sc->sc_gc->gp_intr_disestablish != NULL && ih != NULL)
(*sc->sc_gc->gp_intr_disestablish)(sc->sc_gc->gp_cookie, ih);
}
bool
gpio_intr_str(void *gpio, struct gpio_pinmap *map, int pin, int irqmode,
char *intrstr, size_t intrstrlen)
{
struct gpio_softc *sc = gpio;
const char *mode;
char hwstr[64];
if (sc->sc_gc->gp_intr_str == NULL)
return (false);
irqmode = gpio_irqmode_sanitize(irqmode);
if (irqmode == 0)
return (false);
if (irqmode & GPIO_INTR_DOUBLE_EDGE)
mode = "double edge";
else if (irqmode & GPIO_INTR_POS_EDGE)
mode = "positive edge";
else if (irqmode & GPIO_INTR_NEG_EDGE)
mode = "negative edge";
else if (irqmode & GPIO_INTR_HIGH_LEVEL)
mode = "high level";
else if (irqmode & GPIO_INTR_LOW_LEVEL)
mode = "low level";
else
return (false);
if (! (*sc->sc_gc->gp_intr_str)(sc->sc_gc->gp_cookie,
sc->sc_pins[map->pm_map[pin]].pin_num,
irqmode, hwstr, sizeof(hwstr)))
return (false);
(void) snprintf(intrstr, intrstrlen, "%s (%s)", hwstr, mode);
return (true);
}
int
gpio_npins(uint32_t mask)
{
int npins, i;
for (npins = 0, i = 0; i < 32; i++)
if (mask & (1 << i))
npins++;
return npins;
}
int
gpio_lock(void *data)
{
struct gpio_softc *sc;
int error;
error = 0;
sc = data;
mutex_enter(&sc->sc_mtx);
while (sc->sc_ioctl_busy) {
error = cv_wait_sig(&sc->sc_ioctl, &sc->sc_mtx);
if (error)
break;
}
if (!error)
sc->sc_ioctl_busy = 1;
mutex_exit(&sc->sc_mtx);
return error;
}
void
gpio_unlock(void *data)
{
struct gpio_softc *sc;
sc = data;
mutex_enter(&sc->sc_mtx);
sc->sc_ioctl_busy = 0;
cv_signal(&sc->sc_ioctl);
mutex_exit(&sc->sc_mtx);
}
int
gpioopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct gpio_softc *sc;
sc = device_lookup_private(&gpio_cd, minor(dev));
if (sc == NULL)
return ENXIO;
return gpiobus_open(sc->sc_gc, sc->sc_dev);
}
int
gpioclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct gpio_softc *sc;
sc = device_lookup_private(&gpio_cd, minor(dev));
return gpiobus_close(sc->sc_gc, sc->sc_dev);
}
static int
gpio_pinbyname(struct gpio_softc *sc, char *gp_name)
{
struct gpio_name *nm;
LIST_FOREACH(nm, &sc->sc_names, gp_next)
if (!strcmp(nm->gp_name, gp_name))
return nm->gp_pin;
return -1;
}
int
gpioioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
int error;
struct gpio_softc *sc;
sc = device_lookup_private(&gpio_cd, minor(dev));
error = gpio_lock(sc);
if (error)
return error;
error = gpio_ioctl(sc, cmd, data, flag, l);
gpio_unlock(sc);
return error;
}
static int
gpio_ioctl(struct gpio_softc *sc, u_long cmd, void *data, int flag,
struct lwp *l)
{
gpio_chipset_tag_t gc;
struct gpio_info *info;
struct gpio_attach *attach;
struct gpio_attach_args ga;
struct gpio_req *req;
struct gpio_name *nm;
struct gpio_set *set;
#ifdef COMPAT_50
struct gpio_dev *gdev;
#endif
device_t dv;
cfdata_t cf;
int locs[GPIOCF_NLOCS];
int error, pin, value, flags;
gc = sc->sc_gc;
ga.ga_flags = 0;
if (cmd != GPIOINFO && !device_is_active(sc->sc_dev)) {
DPRINTF(("%s: device is not active\n",
device_xname(sc->sc_dev)));
return EBUSY;
}
switch (cmd) {
case GPIOINFO:
info = data;
info->gpio_npins = sc->sc_npins;
break;
case GPIOREAD:
req = data;
if (req->gp_name[0] != '\0')
req->gp_pin = gpio_pinbyname(sc, req->gp_name);
pin = req->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
/* return read value */
req->gp_value = gpiobus_pin_read(gc, pin);
LIST_FOREACH(nm, &sc->sc_names, gp_next)
if (nm->gp_pin == pin) {
strlcpy(req->gp_name, nm->gp_name, GPIOMAXNAME);
break;
}
break;
case GPIOWRITE:
if ((flag & FWRITE) == 0)
return EBADF;
req = data;
if (req->gp_name[0] != '\0')
pin = gpio_pinbyname(sc, req->gp_name);
else
pin = req->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
value = req->gp_value;
if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH)
return EINVAL;
/* return old value */
req->gp_value = gpiobus_pin_read(gc, pin);
gpiobus_pin_write(gc, pin, value);
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOTOGGLE:
if ((flag & FWRITE) == 0)
return EBADF;
req = data;
if (req->gp_name[0] != '\0')
pin = gpio_pinbyname(sc, req->gp_name);
else
pin = req->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ?
GPIO_PIN_HIGH : GPIO_PIN_LOW);
gpiobus_pin_write(gc, pin, value);
/* return old value */
req->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOATTACH:
attach = data;
ga.ga_flags = attach->ga_flags;
#ifdef COMPAT_50
/* FALLTHROUGH */
case GPIOATTACH50:
/*
* The double assignment to 'attach' in case of GPIOATTACH
* and COMPAT_50 is on purpose. It ensures backward
* compatibility in case we are called through the old
* GPIOATTACH50 ioctl(2), which had not the ga_flags field
* in struct gpio_attach.
*/
attach = data;
#endif
if (kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
/* do not try to attach if the pins are already mapped */
if (!gpio_pin_can_map(sc, attach->ga_offset, attach->ga_mask))
return EBUSY;
error = 0;
mutex_enter(&sc->sc_mtx);
while (sc->sc_attach_busy) {
error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx);
if (error)
break;
}
if (!error)
sc->sc_attach_busy = 1;
mutex_exit(&sc->sc_mtx);
if (error)
return EBUSY;
ga.ga_gpio = sc;
/* Don't access attach->ga_flags here. */
ga.ga_dvname = attach->ga_dvname;
ga.ga_offset = attach->ga_offset;
ga.ga_mask = attach->ga_mask;
DPRINTF(("%s: attach %s with offset %d, mask "
"0x%02x, and flags 0x%02x\n", device_xname(sc->sc_dev),
ga.ga_dvname, ga.ga_offset, ga.ga_mask, ga.ga_flags));
locs[GPIOCF_OFFSET] = ga.ga_offset;
locs[GPIOCF_MASK] = ga.ga_mask;
locs[GPIOCF_FLAG] = ga.ga_flags;
KERNEL_LOCK(1, NULL);
cf = config_search(sc->sc_dev, &ga,
CFARGS(.locators = locs));
if (cf != NULL) {
dv = config_attach(sc->sc_dev, cf, &ga,
gpiobus_print,
CFARGS(.locators = locs));
#ifdef COMPAT_50
if (dv != NULL) {
gdev = kmem_alloc(sizeof(struct gpio_dev),
KM_SLEEP);
gdev->sc_dev = dv;
LIST_INSERT_HEAD(&sc->sc_devs, gdev, sc_next);
} else
error = EINVAL;
#else
if (dv == NULL)
error = EINVAL;
#endif
} else
error = EINVAL;
KERNEL_UNLOCK_ONE(NULL);
mutex_enter(&sc->sc_mtx);
sc->sc_attach_busy = 0;
cv_signal(&sc->sc_attach);
mutex_exit(&sc->sc_mtx);
return error;
case GPIOSET:
if (kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
set = data;
if (set->gp_name[0] != '\0')
pin = gpio_pinbyname(sc, set->gp_name);
else
pin = set->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
flags = set->gp_flags;
/* check that the controller supports all requested flags */
if ((flags & sc->sc_pins[pin].pin_caps) != flags)
return ENODEV;
flags = set->gp_flags;
set->gp_caps = sc->sc_pins[pin].pin_caps;
/* return old value */
set->gp_flags = sc->sc_pins[pin].pin_flags;
if (flags > 0) {
flags |= GPIO_PIN_SET;
gpiobus_pin_ctl(gc, pin, flags);
/* update current value */
sc->sc_pins[pin].pin_flags = flags;
}
/* rename pin or new pin? */
if (set->gp_name2[0] != '\0') {
struct gpio_name *gnm;
gnm = NULL;
LIST_FOREACH(nm, &sc->sc_names, gp_next) {
if (!strcmp(nm->gp_name, set->gp_name2) &&
nm->gp_pin != pin)
return EINVAL; /* duplicate name */
if (nm->gp_pin == pin)
gnm = nm;
}
if (gnm != NULL)
strlcpy(gnm->gp_name, set->gp_name2,
sizeof(gnm->gp_name));
else {
nm = kmem_alloc(sizeof(struct gpio_name),
KM_SLEEP);
strlcpy(nm->gp_name, set->gp_name2,
sizeof(nm->gp_name));
nm->gp_pin = set->gp_pin;
LIST_INSERT_HEAD(&sc->sc_names, nm, gp_next);
}
}
break;
case GPIOUNSET:
if (kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
set = data;
if (set->gp_name[0] != '\0')
pin = gpio_pinbyname(sc, set->gp_name);
else
pin = set->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET))
return EINVAL;
LIST_FOREACH(nm, &sc->sc_names, gp_next) {
if (nm->gp_pin == pin) {
LIST_REMOVE(nm, gp_next);
kmem_free(nm, sizeof(struct gpio_name));
break;
}
}
sc->sc_pins[pin].pin_flags &= ~GPIO_PIN_SET;
break;
default:
#ifdef COMPAT_50
/* Try the old API */
DPRINTF(("%s: trying the old API\n", device_xname(sc->sc_dev)));
return gpio_ioctl_oapi(sc, cmd, data, flag, l);
#else
return ENOTTY;
#endif
}
return 0;
}
#ifdef COMPAT_50
static int
gpio_ioctl_oapi(struct gpio_softc *sc, u_long cmd, void *data, int flag,
struct lwp *l)
{
gpio_chipset_tag_t gc;
struct gpio_pin_op *op;
struct gpio_pin_ctl *ctl;
struct gpio_attach *attach;
struct gpio_dev *gdev;
int error, pin, value, flags;
gc = sc->sc_gc;
switch (cmd) {
case GPIOPINREAD:
op = data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
/* return read value */
op->gp_value = gpiobus_pin_read(gc, pin);
break;
case GPIOPINWRITE:
if ((flag & FWRITE) == 0)
return EBADF;
op = data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
value = op->gp_value;
if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH)
return EINVAL;
gpiobus_pin_write(gc, pin, value);
/* return old value */
op->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOPINTOGGLE:
if ((flag & FWRITE) == 0)
return EBADF;
op = data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
if (!(sc->sc_pins[pin].pin_flags & GPIO_PIN_SET) &&
kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ?
GPIO_PIN_HIGH : GPIO_PIN_LOW);
gpiobus_pin_write(gc, pin, value);
/* return old value */
op->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOPINCTL:
ctl = data;
if (kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
pin = ctl->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return EINVAL;
if (sc->sc_pins[pin].pin_mapped)
return EBUSY;
flags = ctl->gp_flags;
/* check that the controller supports all requested flags */
if ((flags & sc->sc_pins[pin].pin_caps) != flags)
return ENODEV;
ctl->gp_caps = sc->sc_pins[pin].pin_caps;
/* return old value */
ctl->gp_flags = sc->sc_pins[pin].pin_flags;
if (flags > 0) {
gpiobus_pin_ctl(gc, pin, flags);
/* update current value */
sc->sc_pins[pin].pin_flags = flags;
}
break;
case GPIODETACH50:
/* FALLTHOUGH */
case GPIODETACH:
if (kauth_authorize_device(l->l_cred,
KAUTH_DEVICE_GPIO_PINSET, NULL, NULL, NULL, NULL))
return EPERM;
error = 0;
mutex_enter(&sc->sc_mtx);
while (sc->sc_attach_busy) {
error = cv_wait_sig(&sc->sc_attach, &sc->sc_mtx);
if (error)
break;
}
if (!error)
sc->sc_attach_busy = 1;
mutex_exit(&sc->sc_mtx);
if (error)
return EBUSY;
KERNEL_LOCK(1, NULL);
attach = data;
LIST_FOREACH(gdev, &sc->sc_devs, sc_next) {
if (strcmp(device_xname(gdev->sc_dev),
attach->ga_dvname) == 0) {
mutex_enter(&sc->sc_mtx);
sc->sc_attach_busy = 0;
cv_signal(&sc->sc_attach);
mutex_exit(&sc->sc_mtx);
if (config_detach(gdev->sc_dev, 0) == 0) {
KERNEL_UNLOCK_ONE(NULL);
return 0;
}
break;
}
}
KERNEL_UNLOCK_ONE(NULL);
if (gdev == NULL) {
mutex_enter(&sc->sc_mtx);
sc->sc_attach_busy = 0;
cv_signal(&sc->sc_attach);
mutex_exit(&sc->sc_mtx);
}
return EINVAL;
default:
return ENOTTY;
}
return 0;
}
#endif /* COMPAT_50 */
MODULE(MODULE_CLASS_DRIVER, gpio, NULL);
#ifdef _MODULE
#include "ioconf.c"
#endif
static int
gpio_modcmd(modcmd_t cmd, void *opaque)
{
#ifdef _MODULE
devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR;
int error;
#endif
switch (cmd) {
case MODULE_CMD_INIT:
#ifdef _MODULE
error = devsw_attach(gpio_cd.cd_name, NULL, &bmajor,
&gpio_cdevsw, &cmajor);
if (error) {
aprint_error("%s: unable to register devsw\n",
gpio_cd.cd_name);
return error;
}
error = config_init_component(cfdriver_ioconf_gpio,
cfattach_ioconf_gpio, cfdata_ioconf_gpio);
if (error) {
aprint_error("%s: unable to init component\n",
gpio_cd.cd_name);
devsw_detach(NULL, &gpio_cdevsw);
return error;
}
#endif
return 0;
case MODULE_CMD_FINI:
#ifdef _MODULE
config_fini_component(cfdriver_ioconf_gpio,
cfattach_ioconf_gpio, cfdata_ioconf_gpio);
devsw_detach(NULL, &gpio_cdevsw);
#endif
return 0;
default:
return ENOTTY;
}
}
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