diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/Makefile | 8 | ||||
| -rw-r--r-- | tools/gpio/Makefile | 12 | ||||
| -rw-r--r-- | tools/gpio/gpio-utils.c | 11 | ||||
| -rw-r--r-- | tools/gpio/gpio-utils.h | 25 | ||||
| -rw-r--r-- | tools/gpio/lsgpio.c | 128 |
5 files changed, 181 insertions, 3 deletions
diff --git a/tools/Makefile b/tools/Makefile index 6339f6ac3ccb..f41e7c6ea23e 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -13,6 +13,7 @@ help: @echo ' cpupower - a tool for all things x86 CPU power' @echo ' firewire - the userspace part of nosy, an IEEE-1394 traffic sniffer' @echo ' freefall - laptop accelerometer program for disk protection' + @echo ' gpio - GPIO tools' @echo ' hv - tools used when in Hyper-V clients' @echo ' iio - IIO tools' @echo ' lguest - a minimal 32-bit x86 hypervisor' @@ -53,7 +54,7 @@ acpi: FORCE cpupower: FORCE $(call descend,power/$@) -cgroup firewire hv guest spi usb virtio vm net iio: FORCE +cgroup firewire hv guest spi usb virtio vm net iio gpio: FORCE $(call descend,$@) liblockdep: FORCE @@ -119,7 +120,7 @@ acpi_clean: cpupower_clean: $(call descend,power/cpupower,clean) -cgroup_clean hv_clean firewire_clean lguest_clean spi_clean usb_clean virtio_clean vm_clean net_clean iio_clean: +cgroup_clean hv_clean firewire_clean lguest_clean spi_clean usb_clean virtio_clean vm_clean net_clean iio_clean gpio_clean: $(call descend,$(@:_clean=),clean) liblockdep_clean: @@ -155,6 +156,7 @@ build_clean: clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean lguest_clean \ perf_clean selftests_clean turbostat_clean spi_clean usb_clean virtio_clean \ vm_clean net_clean iio_clean x86_energy_perf_policy_clean tmon_clean \ - freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean + freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean \ + gpio_clean .PHONY: FORCE diff --git a/tools/gpio/Makefile b/tools/gpio/Makefile new file mode 100644 index 000000000000..4d198d5c4203 --- /dev/null +++ b/tools/gpio/Makefile @@ -0,0 +1,12 @@ +CC = $(CROSS_COMPILE)gcc +CFLAGS += -Wall -g -D_GNU_SOURCE + +all: lsgpio + +lsgpio: lsgpio.o gpio-utils.o + +%.o: %.c gpio-utils.h + +.PHONY: clean +clean: + rm -f *.o lsgpio diff --git a/tools/gpio/gpio-utils.c b/tools/gpio/gpio-utils.c new file mode 100644 index 000000000000..8208718f2c99 --- /dev/null +++ b/tools/gpio/gpio-utils.c @@ -0,0 +1,11 @@ +/* + * GPIO tools - helpers library for the GPIO tools + * + * Copyright (C) 2015 Linus Walleij + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include "gpio-utils.h" diff --git a/tools/gpio/gpio-utils.h b/tools/gpio/gpio-utils.h new file mode 100644 index 000000000000..b18209a45ad3 --- /dev/null +++ b/tools/gpio/gpio-utils.h @@ -0,0 +1,25 @@ +/* + * GPIO tools - utility helpers library for the GPIO tools + * + * Copyright (C) 2015 Linus Walleij + * + * Portions copied from iio_utils and lssio: + * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de> + * Copyright (c) 2008 Jonathan Cameron + * * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ +#ifndef _GPIO_UTILS_H_ +#define _GPIO_UTILS_H_ + +#include <string.h> + +static inline int check_prefix(const char *str, const char *prefix) +{ + return strlen(str) > strlen(prefix) && + strncmp(str, prefix, strlen(prefix)) == 0; +} + +#endif /* _GPIO_UTILS_H_ */ diff --git a/tools/gpio/lsgpio.c b/tools/gpio/lsgpio.c new file mode 100644 index 000000000000..4cfe29da279b --- /dev/null +++ b/tools/gpio/lsgpio.c @@ -0,0 +1,128 @@ +/* + * lsgpio - example on how to list the GPIO lines on a system + * + * Copyright (C) 2015 Linus Walleij + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * Usage: + * lsgpio <-n device-name> + */ + +#include <unistd.h> +#include <stdlib.h> +#include <stdbool.h> +#include <stdio.h> +#include <dirent.h> +#include <errno.h> +#include <string.h> +#include <poll.h> +#include <fcntl.h> +#include <getopt.h> +#include <sys/ioctl.h> +#include <linux/gpio.h> + +#include "gpio-utils.h" + +int list_device(const char *device_name) +{ + struct gpiochip_info cinfo; + char *chrdev_name; + int fd; + int ret; + + ret = asprintf(&chrdev_name, "/dev/%s", device_name); + if (ret < 0) + return -ENOMEM; + + fd = open(chrdev_name, 0); + if (fd == -1) { + ret = -errno; + fprintf(stderr, "Failed to open %s\n", chrdev_name); + goto free_chrdev_name; + } + + /* Inspect this GPIO chip */ + ret = ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &cinfo); + if (ret == -1) { + ret = -errno; + fprintf(stderr, "Failed to retrieve GPIO fd\n"); + if (close(fd) == -1) + perror("Failed to close GPIO character device file"); + + goto free_chrdev_name; + } + fprintf(stdout, "GPIO chip: %s, %u GPIO lines\n", + cinfo.name, cinfo.lines); + + if (close(fd) == -1) { + ret = -errno; + goto free_chrdev_name; + } + +free_chrdev_name: + free(chrdev_name); + + return ret; + +} + +void print_usage(void) +{ + fprintf(stderr, "Usage: lsgpio [options]...\n" + "List GPIO chips, lines and states\n" + " -n <name> List GPIOs on a named device\n" + " -? This helptext\n" + ); +} + +int main(int argc, char **argv) +{ + const char *device_name; + int ret; + int c; + + while ((c = getopt(argc, argv, "n:")) != -1) { + switch (c) { + case 'n': + device_name = optarg; + break; + case '?': + print_usage(); + return -1; + } + } + + if (device_name) + ret = list_device(device_name); + else { + const struct dirent *ent; + DIR *dp; + + /* List all GPIO devices one at a time */ + dp = opendir("/dev"); + if (!dp) { + ret = -errno; + goto error_out; + } + + ret = -ENOENT; + while (ent = readdir(dp), ent) { + if (check_prefix(ent->d_name, "gpiochip")) { + ret = list_device(ent->d_name); + if (ret) + break; + } + } + + ret = 0; + if (closedir(dp) == -1) { + perror("scanning devices: Failed to close directory"); + ret = -errno; + } + } +error_out: + return ret; +} |