NetBSD/usr.sbin/gpioctl/gpioctl.c

379 lines
8.7 KiB
C

/* $NetBSD: gpioctl.c,v 1.23 2016/04/05 10:58:04 bouyer Exp $ */
/*
* Copyright (c) 2008, 2010, 2011, 2013 Marc Balmer <mbalmer@NetBSD.org>
* Copyright (c) 2004 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.
*/
/*
* Program to control GPIO devices.
*/
#include <sys/types.h>
#include <sys/gpio.h>
#include <sys/ioctl.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
static char *dev;
static int devfd = -1;
static int quiet = 0;
static int state = 0;
static void getinfo(void);
static void gpioread(int, char *);
static void gpiowrite(int, char *, int);
static void gpioset(int pin, char *name, int flags, char *alias);
static void gpiounset(int pin, char *name);
static void devattach(char *, int, uint32_t, uint32_t);
__dead static void usage(void);
static const struct bitstr {
unsigned int mask;
const char *string;
} pinflags[] = {
{ GPIO_PIN_INPUT, "in" },
{ GPIO_PIN_OUTPUT, "out" },
{ GPIO_PIN_INOUT, "inout" },
{ GPIO_PIN_OPENDRAIN, "od" },
{ GPIO_PIN_PUSHPULL, "pp" },
{ GPIO_PIN_TRISTATE, "tri" },
{ GPIO_PIN_PULLUP, "pu" },
{ GPIO_PIN_PULLDOWN, "pd" },
{ GPIO_PIN_INVIN, "iin" },
{ GPIO_PIN_INVOUT, "iout" },
{ GPIO_PIN_PULSATE, "pulsate" },
{ GPIO_PIN_ALT0, "alt0" },
{ GPIO_PIN_ALT1, "alt1" },
{ GPIO_PIN_ALT2, "alt2" },
{ GPIO_PIN_ALT3, "alt3" },
{ GPIO_PIN_ALT4, "alt4" },
{ GPIO_PIN_ALT5, "alt5" },
{ GPIO_PIN_ALT6, "alt6" },
{ GPIO_PIN_ALT7, "alt7" },
{ GPIO_PIN_EVENTS, "events" },
{ GPIO_PIN_LEVEL, "level" },
{ GPIO_PIN_FALLING, "falling" },
{ GPIO_PIN_USER, "user" },
{ 0, NULL },
};
int
main(int argc, char *argv[])
{
const struct bitstr *bs;
int pin, ch, n, fl = 0, value = 0;
const char *errstr;
char *ep;
int ga_offset = -1;
uint32_t ga_mask = 0;
uint32_t ga_flags = 0;
long lval;
char *nam = NULL;
char *flags;
char devn[32];
while ((ch = getopt(argc, argv, "qs")) != -1)
switch (ch) {
case 'q':
quiet = 1;
break;
case 's':
quiet = state = 1;
break;
default:
usage();
/* NOTREACHED */
}
argc -= optind;
argv += optind;
if (argc < 1)
usage();
dev = argv[0];
if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) {
(void)snprintf(devn, sizeof(devn), "%s%s", _PATH_DEV, dev);
dev = devn;
}
if ((devfd = open(dev, O_RDWR)) == -1)
err(EXIT_FAILURE, "%s", dev);
if (argc == 1) {
getinfo();
return EXIT_SUCCESS;
}
if (!strcmp(argv[1], "attach")) {
char *driver, *offset, *mask;
if (argc != 5 && argc != 6)
usage();
driver = argv[2];
offset = argv[3];
mask = argv[4];
flags = argc == 6 ? argv[5] : NULL;
ga_offset = strtonum(offset, 0, INT_MAX, &errstr);
if (errstr)
errx(EXIT_FAILURE, "offset is %s: %s", errstr, offset);
lval = strtol(mask, &ep, 0);
if (*mask == '\0' || *ep != '\0')
errx(EXIT_FAILURE, "invalid mask (not a number)");
if ((errno == ERANGE && (lval == LONG_MAX
|| lval == LONG_MIN)) || (unsigned long)lval > UINT_MAX)
errx(EXIT_FAILURE, "mask out of range");
ga_mask = lval;
if (flags != NULL) {
lval = strtol(flags, &ep, 0);
if (*flags == '\0' || *ep != '\0')
errx(EXIT_FAILURE,
"invalid flag locator (not a number)");
if ((errno == ERANGE && (lval == LONG_MAX
|| lval == LONG_MIN))
|| (unsigned long)lval > UINT_MAX)
errx(EXIT_FAILURE, "flag locator out of range");
ga_flags = lval;
}
devattach(driver, ga_offset, ga_mask, ga_flags);
return EXIT_SUCCESS;
} else {
char *nm = NULL;
/* expecting a pin number or name */
pin = strtonum(argv[1], 0, INT_MAX, &errstr);
if (errstr)
nm = argv[1]; /* try named pin */
if (argc > 2) {
if (!strcmp(argv[2], "set")) {
for (n = 3; n < argc; n++) {
for (bs = pinflags; bs->string != NULL;
bs++) {
if (!strcmp(argv[n],
bs->string)) {
fl |= bs->mask;
break;
}
}
if (bs->string == NULL)
nam = argv[n];
}
gpioset(pin, nm, fl, nam);
} else if (!strcmp(argv[2], "unset"))
gpiounset(pin, nm);
else {
value = strtonum(argv[2], INT_MIN, INT_MAX,
&errstr);
if (errstr) {
if (!strcmp(argv[2], "on"))
value = GPIO_PIN_HIGH;
else if (!strcmp(argv[2], "off"))
value = GPIO_PIN_LOW;
else if (!strcmp(argv[2], "toggle"))
value = 2;
else
errx(EXIT_FAILURE,
"%s: invalid value",
argv[2]);
}
gpiowrite(pin, nm, value);
}
} else
gpioread(pin, nm);
}
return EXIT_SUCCESS;
}
static void
getinfo(void)
{
struct gpio_info info;
if (ioctl(devfd, GPIOINFO, &info) == -1)
err(EXIT_FAILURE, "GPIOINFO");
if (state)
printf("%d\n", info.gpio_npins);
if (quiet)
return;
printf("%s: %d pins\n", dev, info.gpio_npins);
}
static void
gpioread(int pin, char *gp_name)
{
struct gpio_req req;
memset(&req, 0, sizeof(req));
if (gp_name != NULL)
strlcpy(req.gp_name, gp_name, sizeof(req.gp_name));
else
req.gp_pin = pin;
if (ioctl(devfd, GPIOREAD, &req) == -1)
err(EXIT_FAILURE, "GPIOREAD");
if (state)
printf("%d\n", req.gp_value);
if (quiet)
return;
if (gp_name)
printf("pin %s: state %d\n", gp_name, req.gp_value);
else
printf("pin %d: state %d\n", pin, req.gp_value);
}
static void
gpiowrite(int pin, char *gp_name, int value)
{
struct gpio_req req;
if (value < 0 || value > 2)
errx(EXIT_FAILURE, "%d: invalid value", value);
memset(&req, 0, sizeof(req));
if (gp_name != NULL)
strlcpy(req.gp_name, gp_name, sizeof(req.gp_name));
else
req.gp_pin = pin;
if (value == GPIO_PIN_HIGH || value == GPIO_PIN_LOW) {
req.gp_value = value;
if (ioctl(devfd, GPIOWRITE, &req) == -1)
err(EXIT_FAILURE, "GPIOWRITE");
} else {
if (ioctl(devfd, GPIOTOGGLE, &req) == -1)
err(EXIT_FAILURE, "GPIOTOGGLE");
}
if (state)
printf("%d\n", value < 2 ? value : 1 - req.gp_value);
if (quiet)
return;
if (gp_name)
printf("pin %s: state %d -> %d\n", gp_name, req.gp_value,
(value < 2 ? value : 1 - req.gp_value));
else
printf("pin %d: state %d -> %d\n", pin, req.gp_value,
(value < 2 ? value : 1 - req.gp_value));
}
static void
gpioset(int pin, char *name, int fl, char *alias)
{
struct gpio_set set;
const struct bitstr *bs;
memset(&set, 0, sizeof(set));
if (name != NULL)
strlcpy(set.gp_name, name, sizeof(set.gp_name));
else
set.gp_pin = pin;
set.gp_flags = fl;
if (alias != NULL)
strlcpy(set.gp_name2, alias, sizeof(set.gp_name2));
if (ioctl(devfd, GPIOSET, &set) == -1)
err(EXIT_FAILURE, "GPIOSET");
if (quiet)
return;
if (name != NULL)
printf("pin %s: caps:", name);
else
printf("pin %d: caps:", pin);
for (bs = pinflags; bs->string != NULL; bs++)
if (set.gp_caps & bs->mask)
printf(" %s", bs->string);
printf(", flags:");
for (bs = pinflags; bs->string != NULL; bs++)
if (set.gp_flags & bs->mask)
printf(" %s", bs->string);
if (fl > 0) {
printf(" ->");
for (bs = pinflags; bs->string != NULL; bs++)
if (fl & bs->mask)
printf(" %s", bs->string);
}
printf("\n");
}
static void
gpiounset(int pin, char *name)
{
struct gpio_set set;
memset(&set, 0, sizeof(set));
if (name != NULL)
strlcpy(set.gp_name, name, sizeof(set.gp_name));
else
set.gp_pin = pin;
if (ioctl(devfd, GPIOUNSET, &set) == -1)
err(EXIT_FAILURE, "GPIOUNSET");
}
static void
devattach(char *dvname, int offset, uint32_t mask, uint32_t flags)
{
struct gpio_attach attach;
memset(&attach, 0, sizeof(attach));
strlcpy(attach.ga_dvname, dvname, sizeof(attach.ga_dvname));
attach.ga_offset = offset;
attach.ga_mask = mask;
attach.ga_flags = flags;
if (ioctl(devfd, GPIOATTACH, &attach) == -1)
err(EXIT_FAILURE, "GPIOATTACH");
}
static void
usage(void)
{
const char *progname;
progname = getprogname();
fprintf(stderr, "usage: %s [-qs] device [pin] [0 | 1 | 2 | "
"on | off | toggle]\n", progname);
fprintf(stderr, " %s [-q] device pin set [flags] [name]\n",
progname);
fprintf(stderr, " %s [-q] device pin unset\n", progname);
fprintf(stderr, " %s [-q] device attach device offset mask "
"[flag]\n",
progname);
exit(EXIT_FAILURE);
}