gpioctl.c revision 1.22
1 /* $NetBSD: gpioctl.c,v 1.22 2015/12/06 07:31:28 mlelstv Exp $ */ 2 3 /* 4 * Copyright (c) 2008, 2010, 2011, 2013 Marc Balmer <mbalmer (at) NetBSD.org> 5 * Copyright (c) 2004 Alexander Yurchenko <grange (at) openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * Program to control GPIO devices. 22 */ 23 24 #include <sys/types.h> 25 #include <sys/gpio.h> 26 #include <sys/ioctl.h> 27 28 #include <err.h> 29 #include <errno.h> 30 #include <fcntl.h> 31 #include <limits.h> 32 #include <paths.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <time.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 static char *dev; 40 static int devfd = -1; 41 static int quiet = 0; 42 static int state = 0; 43 44 static void getinfo(void); 45 static void gpioread(int, char *); 46 static void gpiowrite(int, char *, int); 47 static void gpioset(int pin, char *name, int flags, char *alias); 48 static void gpiounset(int pin, char *name); 49 static void devattach(char *, int, uint32_t, uint32_t); 50 __dead static void usage(void); 51 52 static const struct bitstr { 53 unsigned int mask; 54 const char *string; 55 } pinflags[] = { 56 { GPIO_PIN_INPUT, "in" }, 57 { GPIO_PIN_OUTPUT, "out" }, 58 { GPIO_PIN_INOUT, "inout" }, 59 { GPIO_PIN_OPENDRAIN, "od" }, 60 { GPIO_PIN_PUSHPULL, "pp" }, 61 { GPIO_PIN_TRISTATE, "tri" }, 62 { GPIO_PIN_PULLUP, "pu" }, 63 { GPIO_PIN_PULLDOWN, "pd" }, 64 { GPIO_PIN_INVIN, "iin" }, 65 { GPIO_PIN_INVOUT, "iout" }, 66 { GPIO_PIN_PULSATE, "pulsate" }, 67 { GPIO_PIN_ALT0, "alt0" }, 68 { GPIO_PIN_ALT1, "alt1" }, 69 { GPIO_PIN_ALT2, "alt2" }, 70 { GPIO_PIN_ALT3, "alt3" }, 71 { GPIO_PIN_ALT4, "alt4" }, 72 { GPIO_PIN_ALT5, "alt5" }, 73 { GPIO_PIN_ALT6, "alt6" }, 74 { GPIO_PIN_ALT7, "alt7" }, 75 { GPIO_PIN_ALT7, "events" }, 76 { GPIO_PIN_ALT7, "level" }, 77 { GPIO_PIN_ALT7, "falling" }, 78 { GPIO_PIN_USER, "user" }, 79 { 0, NULL }, 80 }; 81 82 int 83 main(int argc, char *argv[]) 84 { 85 const struct bitstr *bs; 86 int pin, ch, n, fl = 0, value = 0; 87 const char *errstr; 88 char *ep; 89 int ga_offset = -1; 90 uint32_t ga_mask = 0; 91 uint32_t ga_flags = 0; 92 long lval; 93 char *nam = NULL; 94 char *flags; 95 char devn[32]; 96 97 while ((ch = getopt(argc, argv, "qs")) != -1) 98 switch (ch) { 99 case 'q': 100 quiet = 1; 101 break; 102 case 's': 103 quiet = state = 1; 104 break; 105 default: 106 usage(); 107 /* NOTREACHED */ 108 } 109 argc -= optind; 110 argv += optind; 111 112 if (argc < 1) 113 usage(); 114 dev = argv[0]; 115 116 if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) { 117 (void)snprintf(devn, sizeof(devn), "%s%s", _PATH_DEV, dev); 118 dev = devn; 119 } 120 121 if ((devfd = open(dev, O_RDWR)) == -1) 122 err(EXIT_FAILURE, "%s", dev); 123 124 if (argc == 1) { 125 getinfo(); 126 return EXIT_SUCCESS; 127 } 128 129 if (!strcmp(argv[1], "attach")) { 130 char *driver, *offset, *mask; 131 132 if (argc != 5 && argc != 6) 133 usage(); 134 135 driver = argv[2]; 136 offset = argv[3]; 137 mask = argv[4]; 138 flags = argc == 6 ? argv[5] : NULL; 139 140 ga_offset = strtonum(offset, 0, INT_MAX, &errstr); 141 if (errstr) 142 errx(EXIT_FAILURE, "offset is %s: %s", errstr, offset); 143 lval = strtol(mask, &ep, 0); 144 if (*mask == '\0' || *ep != '\0') 145 errx(EXIT_FAILURE, "invalid mask (not a number)"); 146 if ((errno == ERANGE && (lval == LONG_MAX 147 || lval == LONG_MIN)) || (unsigned long)lval > UINT_MAX) 148 errx(EXIT_FAILURE, "mask out of range"); 149 ga_mask = lval; 150 if (flags != NULL) { 151 lval = strtol(flags, &ep, 0); 152 if (*flags == '\0' || *ep != '\0') 153 errx(EXIT_FAILURE, 154 "invalid flag locator (not a number)"); 155 if ((errno == ERANGE && (lval == LONG_MAX 156 || lval == LONG_MIN)) 157 || (unsigned long)lval > UINT_MAX) 158 errx(EXIT_FAILURE, "flag locator out of range"); 159 160 ga_flags = lval; 161 } 162 devattach(driver, ga_offset, ga_mask, ga_flags); 163 return EXIT_SUCCESS; 164 } else { 165 char *nm = NULL; 166 167 /* expecting a pin number or name */ 168 pin = strtonum(argv[1], 0, INT_MAX, &errstr); 169 if (errstr) 170 nm = argv[1]; /* try named pin */ 171 if (argc > 2) { 172 if (!strcmp(argv[2], "set")) { 173 for (n = 3; n < argc; n++) { 174 for (bs = pinflags; bs->string != NULL; 175 bs++) { 176 if (!strcmp(argv[n], 177 bs->string)) { 178 fl |= bs->mask; 179 break; 180 } 181 } 182 if (bs->string == NULL) 183 nam = argv[n]; 184 } 185 gpioset(pin, nm, fl, nam); 186 } else if (!strcmp(argv[2], "unset")) 187 gpiounset(pin, nm); 188 else { 189 value = strtonum(argv[2], INT_MIN, INT_MAX, 190 &errstr); 191 if (errstr) { 192 if (!strcmp(argv[2], "on")) 193 value = GPIO_PIN_HIGH; 194 else if (!strcmp(argv[2], "off")) 195 value = GPIO_PIN_LOW; 196 else if (!strcmp(argv[2], "toggle")) 197 value = 2; 198 else 199 errx(EXIT_FAILURE, 200 "%s: invalid value", 201 argv[2]); 202 } 203 gpiowrite(pin, nm, value); 204 } 205 } else 206 gpioread(pin, nm); 207 } 208 return EXIT_SUCCESS; 209 } 210 211 static void 212 getinfo(void) 213 { 214 struct gpio_info info; 215 216 if (ioctl(devfd, GPIOINFO, &info) == -1) 217 err(EXIT_FAILURE, "GPIOINFO"); 218 219 if (state) 220 printf("%d\n", info.gpio_npins); 221 222 if (quiet) 223 return; 224 225 printf("%s: %d pins\n", dev, info.gpio_npins); 226 } 227 228 static void 229 gpioread(int pin, char *gp_name) 230 { 231 struct gpio_req req; 232 233 memset(&req, 0, sizeof(req)); 234 if (gp_name != NULL) 235 strlcpy(req.gp_name, gp_name, sizeof(req.gp_name)); 236 else 237 req.gp_pin = pin; 238 239 if (ioctl(devfd, GPIOREAD, &req) == -1) 240 err(EXIT_FAILURE, "GPIOREAD"); 241 242 if (state) 243 printf("%d\n", req.gp_value); 244 245 if (quiet) 246 return; 247 248 if (gp_name) 249 printf("pin %s: state %d\n", gp_name, req.gp_value); 250 else 251 printf("pin %d: state %d\n", pin, req.gp_value); 252 } 253 254 static void 255 gpiowrite(int pin, char *gp_name, int value) 256 { 257 struct gpio_req req; 258 259 if (value < 0 || value > 2) 260 errx(EXIT_FAILURE, "%d: invalid value", value); 261 262 memset(&req, 0, sizeof(req)); 263 if (gp_name != NULL) 264 strlcpy(req.gp_name, gp_name, sizeof(req.gp_name)); 265 else 266 req.gp_pin = pin; 267 268 if (value == GPIO_PIN_HIGH || value == GPIO_PIN_LOW) { 269 req.gp_value = value; 270 if (ioctl(devfd, GPIOWRITE, &req) == -1) 271 err(EXIT_FAILURE, "GPIOWRITE"); 272 } else { 273 if (ioctl(devfd, GPIOTOGGLE, &req) == -1) 274 err(EXIT_FAILURE, "GPIOTOGGLE"); 275 } 276 277 if (state) 278 printf("%d\n", value < 2 ? value : 1 - req.gp_value); 279 280 if (quiet) 281 return; 282 283 if (gp_name) 284 printf("pin %s: state %d -> %d\n", gp_name, req.gp_value, 285 (value < 2 ? value : 1 - req.gp_value)); 286 else 287 printf("pin %d: state %d -> %d\n", pin, req.gp_value, 288 (value < 2 ? value : 1 - req.gp_value)); 289 } 290 291 static void 292 gpioset(int pin, char *name, int fl, char *alias) 293 { 294 struct gpio_set set; 295 const struct bitstr *bs; 296 297 memset(&set, 0, sizeof(set)); 298 if (name != NULL) 299 strlcpy(set.gp_name, name, sizeof(set.gp_name)); 300 else 301 set.gp_pin = pin; 302 set.gp_flags = fl; 303 304 if (alias != NULL) 305 strlcpy(set.gp_name2, alias, sizeof(set.gp_name2)); 306 307 if (ioctl(devfd, GPIOSET, &set) == -1) 308 err(EXIT_FAILURE, "GPIOSET"); 309 310 if (quiet) 311 return; 312 313 if (name != NULL) 314 printf("pin %s: caps:", name); 315 else 316 printf("pin %d: caps:", pin); 317 for (bs = pinflags; bs->string != NULL; bs++) 318 if (set.gp_caps & bs->mask) 319 printf(" %s", bs->string); 320 printf(", flags:"); 321 for (bs = pinflags; bs->string != NULL; bs++) 322 if (set.gp_flags & bs->mask) 323 printf(" %s", bs->string); 324 if (fl > 0) { 325 printf(" ->"); 326 for (bs = pinflags; bs->string != NULL; bs++) 327 if (fl & bs->mask) 328 printf(" %s", bs->string); 329 } 330 printf("\n"); 331 } 332 333 static void 334 gpiounset(int pin, char *name) 335 { 336 struct gpio_set set; 337 338 memset(&set, 0, sizeof(set)); 339 if (name != NULL) 340 strlcpy(set.gp_name, name, sizeof(set.gp_name)); 341 else 342 set.gp_pin = pin; 343 344 if (ioctl(devfd, GPIOUNSET, &set) == -1) 345 err(EXIT_FAILURE, "GPIOUNSET"); 346 } 347 348 static void 349 devattach(char *dvname, int offset, uint32_t mask, uint32_t flags) 350 { 351 struct gpio_attach attach; 352 353 memset(&attach, 0, sizeof(attach)); 354 strlcpy(attach.ga_dvname, dvname, sizeof(attach.ga_dvname)); 355 attach.ga_offset = offset; 356 attach.ga_mask = mask; 357 attach.ga_flags = flags; 358 if (ioctl(devfd, GPIOATTACH, &attach) == -1) 359 err(EXIT_FAILURE, "GPIOATTACH"); 360 } 361 362 static void 363 usage(void) 364 { 365 const char *progname; 366 367 progname = getprogname(); 368 fprintf(stderr, "usage: %s [-qs] device [pin] [0 | 1 | 2 | " 369 "on | off | toggle]\n", progname); 370 fprintf(stderr, " %s [-q] device pin set [flags] [name]\n", 371 progname); 372 fprintf(stderr, " %s [-q] device pin unset\n", progname); 373 fprintf(stderr, " %s [-q] device attach device offset mask " 374 "[flag]\n", 375 progname); 376 377 exit(EXIT_FAILURE); 378 } 379
Indexes created Sat Sep 27 14:09:57 GMT 2025