1 // SPDX-License-Identifier: GPL-2.0-only
3  * lsgpio - example on how to list the GPIO lines on a system
8  *	lsgpio <-n device-name>
24 #include "gpio-utils.h"
45 		.name = "active-low",
49 		.name = "open-drain",
53 		.name = "open-source",
57 		.name = "pull-up",
61 		.name = "pull-down",
65 		.name = "bias-disabled",
76 		if (info->flags & flagnames[i].mask) {  in print_attributes()
82 	if ((info->flags & GPIO_V2_LINE_FLAG_EDGE_RISING) &&  in print_attributes()
83 	    (info->flags & GPIO_V2_LINE_FLAG_EDGE_FALLING))  in print_attributes()
84 		fprintf(stdout, field_format, "both-edges");  in print_attributes()
85 	else if (info->flags & GPIO_V2_LINE_FLAG_EDGE_RISING)  in print_attributes()
86 		fprintf(stdout, field_format, "rising-edge");  in print_attributes()
87 	else if (info->flags & GPIO_V2_LINE_FLAG_EDGE_FALLING)  in print_attributes()
88 		fprintf(stdout, field_format, "falling-edge");  in print_attributes()
90 	for (i = 0; i < info->num_attrs; i++) {  in print_attributes()
91 		if (info->attrs[i].id == GPIO_V2_LINE_ATTR_ID_DEBOUNCE)  in print_attributes()
93 				info->attrs[i].debounce_period_us);  in print_attributes()
107 		return -ENOMEM;  in list_device()
110 	if (fd == -1) {  in list_device()
111 		ret = -errno;  in list_device()
118 	if (ret == -1) {  in list_device()
119 		ret = -errno;  in list_device()
134 		if (ret == -1) {  in list_device()
135 			ret = -errno;  in list_device()
158 	if (close(fd) == -1)  in list_device()
169 		"  -n <name>  List GPIOs on a named device\n"  in print_usage()
170 		"  -?         This helptext\n"  in print_usage()
180 	while ((c = getopt(argc, argv, "n:")) != -1) {  in main()
187 			return -1;  in main()
194 		const struct dirent *ent;  in main()  local
200 			ret = -errno;  in main()
204 		ret = -ENOENT;  in main()
205 		while (ent = readdir(dp), ent) {  in main()
206 			if (check_prefix(ent->d_name, "gpiochip")) {  in main()
207 				ret = list_device(ent->d_name);  in main()
214 		if (closedir(dp) == -1) {  in main()
216 			ret = -errno;  in main()