1 /* $NetBSD: gpioctl.c,v 1.20 2013/05/19 15:31:23 mbalmer Exp $ */ 2 3 /* 4 * Copyright (c) 2008, 2010, 2011, 2013 Marc Balmer <mbalmer@NetBSD.org> 5 * Copyright (c) 2004 Alexander Yurchenko <grange@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 extern long long strtonum(const char *numstr, long long minval, 53 long long maxval, const char **errstrp); 54 55 static const struct bitstr { 56 unsigned int mask; 57 const char *string; 58 } pinflags[] = { 59 { GPIO_PIN_INPUT, "in" }, 60 { GPIO_PIN_OUTPUT, "out" }, 61 { GPIO_PIN_INOUT, "inout" }, 62 { GPIO_PIN_OPENDRAIN, "od" }, 63 { GPIO_PIN_PUSHPULL, "pp" }, 64 { GPIO_PIN_TRISTATE, "tri" }, 65 { GPIO_PIN_PULLUP, "pu" }, 66 { GPIO_PIN_PULLDOWN, "pd" }, 67 { GPIO_PIN_INVIN, "iin" }, 68 { GPIO_PIN_INVOUT, "iout" }, 69 { GPIO_PIN_PULSATE, "pulsate" }, 70 { 0, NULL }, 71 }; 72 73 int 74 main(int argc, char *argv[]) 75 { 76 const struct bitstr *bs; 77 int pin, ch, n, fl = 0, value = 0; 78 const char *errstr; 79 char *ep; 80 int ga_offset = -1; 81 uint32_t ga_mask = 0; 82 uint32_t ga_flags = 0; 83 long lval; 84 char *nam = NULL; 85 char *flags; 86 char devn[32]; 87 88 while ((ch = getopt(argc, argv, "qs")) != -1) 89 switch (ch) { 90 case 'q': 91 quiet = 1; 92 break; 93 case 's': 94 quiet = state = 1; 95 break; 96 default: 97 usage(); 98 /* NOTREACHED */ 99 } 100 argc -= optind; 101 argv += optind; 102 103 if (argc < 1) 104 usage(); 105 dev = argv[0]; 106 107 if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) { 108 (void)snprintf(devn, sizeof(devn), "%s%s", _PATH_DEV, dev); 109 dev = devn; 110 } 111 112 if ((devfd = open(dev, O_RDWR)) == -1) 113 err(EXIT_FAILURE, "%s", dev); 114 115 if (argc == 1) { 116 getinfo(); 117 return EXIT_SUCCESS; 118 } 119 120 if (!strcmp(argv[1], "attach")) { 121 char *driver, *offset, *mask; 122 123 if (argc != 5 && argc != 6) 124 usage(); 125 126 driver = argv[2]; 127 offset = argv[3]; 128 mask = argv[4]; 129 flags = argc == 6 ? argv[5] : NULL; 130 131 ga_offset = strtonum(offset, 0, INT_MAX, &errstr); 132 if (errstr) 133 errx(EXIT_FAILURE, "offset is %s: %s", errstr, offset); 134 lval = strtol(mask, &ep, 0); 135 if (*mask == '\0' || *ep != '\0') 136 errx(EXIT_FAILURE, "invalid mask (not a number)"); 137 if ((errno == ERANGE && (lval == LONG_MAX 138 || lval == LONG_MIN)) || (unsigned long)lval > UINT_MAX) 139 errx(EXIT_FAILURE, "mask out of range"); 140 ga_mask = lval; 141 if (flags != NULL) { 142 lval = strtol(flags, &ep, 0); 143 if (*flags == '\0' || *ep != '\0') 144 errx(EXIT_FAILURE, 145 "invalid flag locator (not a number)"); 146 if ((errno == ERANGE && (lval == LONG_MAX 147 || lval == LONG_MIN)) 148 || (unsigned long)lval > UINT_MAX) 149 errx(EXIT_FAILURE, "flag locator out of range"); 150 151 ga_flags = lval; 152 } 153 devattach(driver, ga_offset, ga_mask, ga_flags); 154 return EXIT_SUCCESS; 155 } else { 156 char *nm = NULL; 157 158 /* expecting a pin number or name */ 159 pin = strtonum(argv[1], 0, INT_MAX, &errstr); 160 if (errstr) 161 nm = argv[1]; /* try named pin */ 162 if (argc > 2) { 163 if (!strcmp(argv[2], "set")) { 164 for (n = 3; n < argc; n++) { 165 for (bs = pinflags; bs->string != NULL; 166 bs++) { 167 if (!strcmp(argv[n], 168 bs->string)) { 169 fl |= bs->mask; 170 break; 171 } 172 } 173 if (bs->string == NULL) 174 nam = argv[n]; 175 } 176 gpioset(pin, nm, fl, nam); 177 } else if (!strcmp(argv[2], "unset")) 178 gpiounset(pin, nm); 179 else { 180 value = strtonum(argv[2], INT_MIN, INT_MAX, 181 &errstr); 182 if (errstr) { 183 if (!strcmp(argv[2], "on")) 184 value = GPIO_PIN_HIGH; 185 else if (!strcmp(argv[2], "off")) 186 value = GPIO_PIN_LOW; 187 else if (!strcmp(argv[2], "toggle")) 188 value = 2; 189 else 190 errx(EXIT_FAILURE, 191 "%s: invalid value", 192 argv[2]); 193 } 194 gpiowrite(pin, nm, value); 195 } 196 } else 197 gpioread(pin, nm); 198 } 199 return EXIT_SUCCESS; 200 } 201 202 static void 203 getinfo(void) 204 { 205 struct gpio_info info; 206 207 if (ioctl(devfd, GPIOINFO, &info) == -1) 208 err(EXIT_FAILURE, "GPIOINFO"); 209 210 if (state) 211 printf("%d\n", info.gpio_npins); 212 213 if (quiet) 214 return; 215 216 printf("%s: %d pins\n", dev, info.gpio_npins); 217 } 218 219 static void 220 gpioread(int pin, char *gp_name) 221 { 222 struct gpio_req req; 223 224 memset(&req, 0, sizeof(req)); 225 if (gp_name != NULL) 226 strlcpy(req.gp_name, gp_name, sizeof(req.gp_name)); 227 else 228 req.gp_pin = pin; 229 230 if (ioctl(devfd, GPIOREAD, &req) == -1) 231 err(EXIT_FAILURE, "GPIOREAD"); 232 233 if (state) 234 printf("%d\n", req.gp_value); 235 236 if (quiet) 237 return; 238 239 if (gp_name) 240 printf("pin %s: state %d\n", gp_name, req.gp_value); 241 else 242 printf("pin %d: state %d\n", pin, req.gp_value); 243 } 244 245 static void 246 gpiowrite(int pin, char *gp_name, int value) 247 { 248 struct gpio_req req; 249 250 if (value < 0 || value > 2) 251 errx(EXIT_FAILURE, "%d: invalid value", value); 252 253 memset(&req, 0, sizeof(req)); 254 if (gp_name != NULL) 255 strlcpy(req.gp_name, gp_name, sizeof(req.gp_name)); 256 else 257 req.gp_pin = pin; 258 259 if (value == GPIO_PIN_HIGH || value == GPIO_PIN_LOW) { 260 req.gp_value = value; 261 if (ioctl(devfd, GPIOWRITE, &req) == -1) 262 err(EXIT_FAILURE, "GPIOWRITE"); 263 } else { 264 if (ioctl(devfd, GPIOTOGGLE, &req) == -1) 265 err(EXIT_FAILURE, "GPIOTOGGLE"); 266 } 267 268 if (state) 269 printf("%d\n", value < 2 ? value : 1 - req.gp_value); 270 271 if (quiet) 272 return; 273 274 if (gp_name) 275 printf("pin %s: state %d -> %d\n", gp_name, req.gp_value, 276 (value < 2 ? value : 1 - req.gp_value)); 277 else 278 printf("pin %d: state %d -> %d\n", pin, req.gp_value, 279 (value < 2 ? value : 1 - req.gp_value)); 280 } 281 282 static void 283 gpioset(int pin, char *name, int fl, char *alias) 284 { 285 struct gpio_set set; 286 const struct bitstr *bs; 287 288 memset(&set, 0, sizeof(set)); 289 if (name != NULL) 290 strlcpy(set.gp_name, name, sizeof(set.gp_name)); 291 else 292 set.gp_pin = pin; 293 set.gp_flags = fl; 294 295 if (alias != NULL) 296 strlcpy(set.gp_name2, alias, sizeof(set.gp_name2)); 297 298 if (ioctl(devfd, GPIOSET, &set) == -1) 299 err(EXIT_FAILURE, "GPIOSET"); 300 301 if (quiet) 302 return; 303 304 if (name != NULL) 305 printf("pin %s: caps:", name); 306 else 307 printf("pin %d: caps:", pin); 308 for (bs = pinflags; bs->string != NULL; bs++) 309 if (set.gp_caps & bs->mask) 310 printf(" %s", bs->string); 311 printf(", flags:"); 312 for (bs = pinflags; bs->string != NULL; bs++) 313 if (set.gp_flags & bs->mask) 314 printf(" %s", bs->string); 315 if (fl > 0) { 316 printf(" ->"); 317 for (bs = pinflags; bs->string != NULL; bs++) 318 if (fl & bs->mask) 319 printf(" %s", bs->string); 320 } 321 printf("\n"); 322 } 323 324 static void 325 gpiounset(int pin, char *name) 326 { 327 struct gpio_set set; 328 329 memset(&set, 0, sizeof(set)); 330 if (name != NULL) 331 strlcpy(set.gp_name, name, sizeof(set.gp_name)); 332 else 333 set.gp_pin = pin; 334 335 if (ioctl(devfd, GPIOUNSET, &set) == -1) 336 err(EXIT_FAILURE, "GPIOUNSET"); 337 } 338 339 static void 340 devattach(char *dvname, int offset, uint32_t mask, uint32_t flags) 341 { 342 struct gpio_attach attach; 343 344 memset(&attach, 0, sizeof(attach)); 345 strlcpy(attach.ga_dvname, dvname, sizeof(attach.ga_dvname)); 346 attach.ga_offset = offset; 347 attach.ga_mask = mask; 348 attach.ga_flags = flags; 349 if (ioctl(devfd, GPIOATTACH, &attach) == -1) 350 err(EXIT_FAILURE, "GPIOATTACH"); 351 } 352 353 static void 354 usage(void) 355 { 356 const char *progname; 357 358 progname = getprogname(); 359 fprintf(stderr, "usage: %s [-qs] device [pin] [0 | 1 | 2 | " 360 "on | off | toggle]\n", progname); 361 fprintf(stderr, " %s [-q] device pin set [flags] [name]\n", 362 progname); 363 fprintf(stderr, " %s [-q] device pin unset\n", progname); 364 fprintf(stderr, " %s [-q] device attach device offset mask " 365 "[flag]\n", 366 progname); 367 368 exit(EXIT_FAILURE); 369 } 370