2  * gpio-hammer - example swiss army knife to shake GPIO lines on a system
11  *	gpio-hammer -n <device-name> -o <offset1> -o <offset2>
26 #include "gpio-utils.h"
28 int hammer_device(const char *device_name, unsigned int *lines, int nlines,  in hammer_device()  argument
31 	struct gpiohandle_data data;  in hammer_device()  local
32 	char swirr[] = "-\\|/";  in hammer_device()
38 	memset(&data.values, 0, sizeof(data.values));  in hammer_device()
39 	ret = gpiotools_request_linehandle(device_name, lines, nlines,  in hammer_device()
40 					   GPIOHANDLE_REQUEST_OUTPUT, &data,  in hammer_device()
41 					   "gpio-hammer");  in hammer_device()
47 	ret = gpiotools_get_values(fd, &data);  in hammer_device()
51 	fprintf(stdout, "Hammer lines [");  in hammer_device()
53 		fprintf(stdout, "%d", lines[i]);  in hammer_device()
54 		if (i != (nlines - 1))  in hammer_device()
59 		fprintf(stdout, "%d", data.values[i]);  in hammer_device()
60 		if (i != (nlines - 1))  in hammer_device()
68 		/* Invert all lines so we blink */  in hammer_device()
70 			data.values[i] = !data.values[i];  in hammer_device()
72 		ret = gpiotools_set_values(fd, &data);  in hammer_device()
76 		/* Re-read values to get status */  in hammer_device()
77 		ret = gpiotools_get_values(fd, &data);  in hammer_device()
83 		if (j == sizeof(swirr)-1)  in hammer_device()
88 			fprintf(stdout, "%d: %d", lines[i], data.values[i]);  in hammer_device()
89 			if (i != (nlines - 1))  in hammer_device()
110 	fprintf(stderr, "Usage: gpio-hammer [options]...\n"  in print_usage()
111 		"Hammer GPIO lines, 0->1->0->1...\n"  in print_usage()
112 		"  -n <name>  Hammer GPIOs on a named device (must be stated)\n"  in print_usage()
113 		"  -o <n>     Offset[s] to hammer, at least one, several can be stated\n"  in print_usage()
114 		" [-c <n>]    Do <n> loops (optional, infinite loop if not stated)\n"  in print_usage()
115 		"  -?         This helptext\n"  in print_usage()
118 		"gpio-hammer -n gpiochip0 -o 4\n"  in print_usage()
125 	unsigned int lines[GPIOHANDLES_MAX];  in main()  local
132 	while ((c = getopt(argc, argv, "c:n:o:?")) != -1) {  in main()
144 			 * '-o' was given to give an accurate error message  in main()
147 				lines[i] = strtoul(optarg, NULL, 10);  in main()
153 			return -1;  in main()
159 			"Only %d occurences of '-o' are allowed, %d were found\n",  in main()
161 		return -1;  in main()
168 		return -1;  in main()
170 	return hammer_device(device_name, lines, nlines, loops);  in main()