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Add gpioctl(8). Utility for configuring/accessing GPIO pins

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Oleksandr Tymoshenko 2010-09-28 03:28:20 +00:00
parent 6b34b16ea5
commit 968ec6a63e
4 changed files with 454 additions and 0 deletions
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1
usr.sbin/Makefile
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@ -27,6 +27,7 @@ SUBDIR= adduser \
fwcontrol \
getfmac \
getpmac \
gpioctl \
gstat \
i2c \
ifmcstat \

6
usr.sbin/gpioctl/Makefile Normal file
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@ -0,0 +1,6 @@
# $FreeBSD$
PROG= gpioctl
MAN= gpioctl.8
.include <bsd.prog.mk>

124
usr.sbin/gpioctl/gpioctl.8 Normal file
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@ -0,0 +1,124 @@
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. 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.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
.\"
.\" $FreeBSD$
.\"
.Dd September 27, 2010
.Dt GPIOCTL 1
.Os
.Sh NAME
.Nm gpioctl
.Nd GPIO control utility
.Sh SYNOPSIS
.Nm
.Cm -l
.Fl f Ar ctldev
.Op Fl v
.Nm
.Cm -t
.Fl f Ar ctldev
.Ar pin
.Nm
.Cm -c
.Fl f Ar ctldev
.Ar pin
.Ar flag
.Op flag ...
.Nm
.Cm -f Ar ctldev
.Ar pin
.Ar [0|1]
.Sh DESCRIPTION
The
.Nm
utility could be used to manage GPIO pins from userland and list available pins.
.Pp
The options are as follows:
.Bl -tag -width ".Fl f Ar ctldev"
.It Fl c Ar pin Ar flag Op flag ...
Configure pin by setting provided flags. The following flags are currently defined:
.Bl -tag -offset indent -width ".Cm PULSE"
.It Cm IN
Input pin
.It Cm OUT
Output pin
.It Cm OD
Open drain pin
.It Cm PP
Push pull pin
.It Cm TS
Tristate pin
.It Cm PU
Pull-up pin
.It Cm PD
Pull-down pin
.It Cm II
Inverted input pin
.It Cm IO
Inverted output pin
.El
.It Fl f Ar ctldev
GPIO controller device to use
.It Fl l
list available pins
.It Fl t Ar pin
toggle value of provided pin number
.It Fl v
be verbose: for each listed pin print current configuration
.El
.Sh EXAMPLES
.Pp
.Bl -bullet
.It
List pins available on GPIO controller defined by device /dev/gpioctl0
.Pp
gpioctl -f /dev/gpioctl0 -l
.It
Set the value of pin 12 to 1
.Pp
gpioctl -f /dev/gpioctl0 12 1
.It
Configure pin 12 to be input pin
.Pp
gpioctl -f /dev/gpioctl0 -c 12 IN
.El
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 9.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
utility and this manual page were written by
.An Oleksandr Tymoshenko
.Aq gonzo@freebsd.org

323
usr.sbin/gpioctl/gpioctl.c Normal file
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/*-
* 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 unmodified, 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 <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/gpio.h>
struct flag_desc {
const char *name;
uint32_t flag;
};
struct flag_desc gpio_flags[] = {
{ "IN", GPIO_PIN_INPUT },
{ "OUT", GPIO_PIN_OUTPUT },
{ "OD", GPIO_PIN_OPENDRAIN },
{ "PP", GPIO_PIN_PUSHPULL },
{ "TS", GPIO_PIN_TRISTATE },
{ "PU", GPIO_PIN_PULLUP },
{ "PD", GPIO_PIN_PULLDOWN },
{ "II", GPIO_PIN_INVIN },
{ "IO", GPIO_PIN_INVOUT },
{ "PULSE", GPIO_PIN_PULSATE },
{ NULL, 0 },
};
int str2cap(const char *str);
static void
usage(void)
{
fprintf(stderr, "Usage:\n");
fprintf(stderr, "\tgpioctl -f ctldev -l [-v]\n");
fprintf(stderr, "\tgpioctl -f ctldev -t pin\n");
fprintf(stderr, "\tgpioctl -f ctldev -c pin flag ...\n");
fprintf(stderr, "\tgpioctl -f ctldev pin [0|1]\n");
exit(1);
}
static const char *
cap2str(uint32_t cap)
{
struct flag_desc * pdesc = gpio_flags;
while (pdesc->name) {
if (pdesc->flag == cap)
return pdesc->name;
pdesc++;
}
return "UNKNOWN";
}
int
str2cap(const char *str)
{
struct flag_desc * pdesc = gpio_flags;
while (pdesc->name) {
if (strcasecmp(str, pdesc->name) == 0)
return pdesc->flag;
pdesc++;
}
return (-1);
}
/*
* Our handmade function for converting string to number
*/
static int
str2int(const char *s, int *ok)
{
char *endptr;
int res = strtod(s, &endptr);
if (endptr != s + strlen(s) )
*ok = 0;
else
*ok = 1;
return res;
}
static void
print_caps(int caps)
{
int i, need_coma;
need_coma = 0;
printf("<");
for (i = 0; i < 32; i++) {
if (caps & (1 << i)) {
if (need_coma)
printf(",");
printf("%s", cap2str(1 << i));
need_coma = 1;
}
}
printf(">");
}
static void
dump_pins(int fd, int verbose)
{
int i, maxpin;
struct gpio_pin pin;
struct gpio_req req;
if (ioctl(fd, GPIOMAXPIN, &maxpin) < 0) {
perror("ioctl(GPIOMAXPIN)");
exit(1);
}
for (i = 0; i <= maxpin; i++) {
pin.gp_pin = i;
if (ioctl(fd, GPIOGETCONFIG, &pin) < 0)
/* For some reason this pin is inaccessible */
continue;
req.gp_pin = i;
if (ioctl(fd, GPIOGET, &req) < 0) {
/* Now, that's wrong */
perror("ioctl(GPIOGET)");
exit(1);
}
printf("pin %02d:\t%d\t%s", pin.gp_pin, req.gp_value,
pin.gp_name);
print_caps(pin.gp_flags);
if (verbose) {
printf(", caps:");
print_caps(pin.gp_caps);
}
printf("\n");
}
}
static void
fail(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
int
main(int argc, char **argv)
{
int i;
struct gpio_pin pin;
struct gpio_req req;
char *ctlfile = NULL;
int pinn, pinv, fd, ch;
int flags, flag, ok;
int config, toggle, verbose, list;
config = toggle = verbose = list = pinn = 0;
while ((ch = getopt(argc, argv, "c:f:lt:v")) != -1) {
switch (ch) {
case 'c':
config = 1;
pinn = str2int(optarg, &ok);
if (!ok)
fail("Invalid pin number: %s\n", optarg);
break;
case 'f':
ctlfile = optarg;
break;
case 'l':
list = 1;
break;
case 't':
toggle = 1;
pinn = str2int(optarg, &ok);
if (!ok)
fail("Invalid pin number: %s\n", optarg);
break;
case 'v':
verbose = 1;
break;
default:
usage();
break;
}
}
argv += optind;
argc -= optind;
for (i = 0; i < argc; i++)
printf("%d/%s\n", i, argv[i]);
if (ctlfile == NULL)
fail("No gpioctl device provided\n");
fd = open(ctlfile, O_RDONLY);
if (fd < 0) {
perror("open");
exit(1);
}
if (list) {
dump_pins(fd, verbose);
close(fd);
exit(0);
}
if (toggle) {
/*
* -t pin assumes no additional arguments
*/
if(argc > 0) {
usage();
exit(1);
}
req.gp_pin = pinn;
if (ioctl(fd, GPIOTOGGLE, &req) < 0) {
perror("ioctl(GPIOTOGGLE)");
exit(1);
}
close(fd);
exit (0);
}
if (config) {
flags = 0;
for (i = 0; i < argc; i++) {
flag = str2cap(argv[i]);
if (flag < 0)
fail("Invalid flag: %s\n", argv[i]);
flags |= flag;
}
pin.gp_pin = pinn;
pin.gp_flags = flags;
if (ioctl(fd, GPIOSETCONFIG, &pin) < 0) {
perror("ioctl(GPIOSETCONFIG)");
exit(1);
}
exit(0);
}
/*
* Last two cases - set value or print value
*/
if ((argc == 0) || (argc > 2)) {
usage();
exit(1);
}
pinn = str2int(argv[0], &ok);
if (!ok)
fail("Invalid pin number: %s\n", argv[0]);
/*
* Read pin value
*/
if (argc == 1) {
req.gp_pin = pinn;
if (ioctl(fd, GPIOGET, &req) < 0) {
perror("ioctl(GPIOGET)");
exit(1);
}
printf("%d\n", req.gp_value);
exit (0);
}
/* Is it valid number (0 or 1) ? */
pinv = str2int(argv[1], &ok);
if (!ok || ((pinv != 0) && (pinv != 1)))
fail("Invalid pin value: %s\n", argv[1]);
/*
* Set pin value
*/
req.gp_pin = pinn;
req.gp_value = pinv;
if (ioctl(fd, GPIOSET, &req) < 0) {
perror("ioctl(GPIOSET)");
exit(1);
}
close(fd);
exit(0);
}