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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | // SPDX-License-Identifier: GPL-2.0 /* * GPIO mockup cdev test helper * * Copyright (C) 2020 Kent Gibson */ #include <errno.h> #include <fcntl.h> #include <signal.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/gpio.h> #define CONSUMER "gpio-mockup-cdev" static int request_line_v2(int cfd, unsigned int offset, uint64_t flags, unsigned int val) { struct gpio_v2_line_request req; int ret; memset(&req, 0, sizeof(req)); req.num_lines = 1; req.offsets[0] = offset; req.config.flags = flags; strcpy(req.consumer, CONSUMER); if (flags & GPIO_V2_LINE_FLAG_OUTPUT) { req.config.num_attrs = 1; req.config.attrs[0].mask = 1; req.config.attrs[0].attr.id = GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES; if (val) req.config.attrs[0].attr.values = 1; } ret = ioctl(cfd, GPIO_V2_GET_LINE_IOCTL, &req); if (ret == -1) return -errno; return req.fd; } static int get_value_v2(int lfd) { struct gpio_v2_line_values vals; int ret; memset(&vals, 0, sizeof(vals)); vals.mask = 1; ret = ioctl(lfd, GPIO_V2_LINE_GET_VALUES_IOCTL, &vals); if (ret == -1) return -errno; return vals.bits & 0x1; } static int request_line_v1(int cfd, unsigned int offset, uint32_t flags, unsigned int val) { struct gpiohandle_request req; int ret; memset(&req, 0, sizeof(req)); req.lines = 1; req.lineoffsets[0] = offset; req.flags = flags; strcpy(req.consumer_label, CONSUMER); if (flags & GPIOHANDLE_REQUEST_OUTPUT) req.default_values[0] = val; ret = ioctl(cfd, GPIO_GET_LINEHANDLE_IOCTL, &req); if (ret == -1) return -errno; return req.fd; } static int get_value_v1(int lfd) { struct gpiohandle_data vals; int ret; memset(&vals, 0, sizeof(vals)); ret = ioctl(lfd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, &vals); if (ret == -1) return -errno; return vals.values[0]; } static void usage(char *prog) { printf("Usage: %s [-l] [-b <bias>] [-s <value>] [-u <uAPI>] <gpiochip> <offset>\n", prog); printf(" -b: set line bias to one of pull-down, pull-up, disabled\n"); printf(" (default is to leave bias unchanged):\n"); printf(" -l: set line active low (default is active high)\n"); printf(" -s: set line value (default is to get line value)\n"); printf(" -u: uAPI version to use (default is 2)\n"); exit(-1); } static int wait_signal(void) { int sig; sigset_t wset; sigemptyset(&wset); sigaddset(&wset, SIGHUP); sigaddset(&wset, SIGINT); sigaddset(&wset, SIGTERM); sigwait(&wset, &sig); return sig; } int main(int argc, char *argv[]) { char *chip; int opt, ret, cfd, lfd; unsigned int offset, val = 0, abiv; uint32_t flags_v1; uint64_t flags_v2; abiv = 2; ret = 0; flags_v1 = GPIOHANDLE_REQUEST_INPUT; flags_v2 = GPIO_V2_LINE_FLAG_INPUT; while ((opt = getopt(argc, argv, "lb:s:u:")) != -1) { switch (opt) { case 'l': flags_v1 |= GPIOHANDLE_REQUEST_ACTIVE_LOW; flags_v2 |= GPIO_V2_LINE_FLAG_ACTIVE_LOW; break; case 'b': if (strcmp("pull-up", optarg) == 0) { flags_v1 |= GPIOHANDLE_REQUEST_BIAS_PULL_UP; flags_v2 |= GPIO_V2_LINE_FLAG_BIAS_PULL_UP; } else if (strcmp("pull-down", optarg) == 0) { flags_v1 |= GPIOHANDLE_REQUEST_BIAS_PULL_DOWN; flags_v2 |= GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN; } else if (strcmp("disabled", optarg) == 0) { flags_v1 |= GPIOHANDLE_REQUEST_BIAS_DISABLE; flags_v2 |= GPIO_V2_LINE_FLAG_BIAS_DISABLED; } break; case 's': val = atoi(optarg); flags_v1 &= ~GPIOHANDLE_REQUEST_INPUT; flags_v1 |= GPIOHANDLE_REQUEST_OUTPUT; flags_v2 &= ~GPIO_V2_LINE_FLAG_INPUT; flags_v2 |= GPIO_V2_LINE_FLAG_OUTPUT; break; case 'u': abiv = atoi(optarg); break; default: usage(argv[0]); } } if (argc < optind + 2) usage(argv[0]); chip = argv[optind]; offset = atoi(argv[optind + 1]); cfd = open(chip, 0); if (cfd == -1) { fprintf(stderr, "Failed to open %s: %s\n", chip, strerror(errno)); return -errno; } if (abiv == 1) lfd = request_line_v1(cfd, offset, flags_v1, val); else lfd = request_line_v2(cfd, offset, flags_v2, val); close(cfd); if (lfd < 0) { fprintf(stderr, "Failed to request %s:%d: %s\n", chip, offset, strerror(-lfd)); return lfd; } if (flags_v2 & GPIO_V2_LINE_FLAG_OUTPUT) { wait_signal(); } else { if (abiv == 1) ret = get_value_v1(lfd); else ret = get_value_v2(lfd); } close(lfd); return ret; } |