gpiosim.c revision 1.17
1 /* $NetBSD: gpiosim.c,v 1.17 2015/08/20 12:09:22 uebayasi Exp $ */ 2 /* $OpenBSD: gpiosim.c,v 1.1 2008/11/23 18:46:49 mbalmer Exp $ */ 3 4 /* 5 * Copyright (c) 2007 - 2011, 2013 Marc Balmer <marc (at) msys.ch> 6 * All rights reserved. 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN 17 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 18 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 /* 64 bit wide GPIO simulator */ 22 23 #include <sys/param.h> 24 #include <sys/systm.h> 25 #include <sys/device.h> 26 #include <sys/gpio.h> 27 #include <sys/malloc.h> 28 #include <sys/module.h> 29 #include <sys/sysctl.h> 30 #include <sys/ioccom.h> 31 #include <dev/gpio/gpiovar.h> 32 33 #include "gpiosim.h" 34 35 #define GPIOSIM_NPINS 64 36 37 struct gpiosim_softc { 38 device_t sc_dev; 39 device_t sc_gdev; /* gpio that attaches here */ 40 uint64_t sc_state; 41 struct gpio_chipset_tag sc_gpio_gc; 42 gpio_pin_t sc_gpio_pins[GPIOSIM_NPINS]; 43 44 struct sysctllog *sc_log; 45 }; 46 47 static int gpiosim_match(device_t, cfdata_t, void *); 48 void gpiosimattach(int); 49 static void gpiosim_attach(device_t, device_t, void *); 50 static int gpiosim_detach(device_t, int); 51 static int gpiosim_sysctl(SYSCTLFN_PROTO); 52 53 static int gpiosim_pin_read(void *, int); 54 static void gpiosim_pin_write(void *, int, int); 55 static void gpiosim_pin_ctl(void *, int, int); 56 57 CFATTACH_DECL_NEW(gpiosim, sizeof(struct gpiosim_softc), gpiosim_match, 58 gpiosim_attach, gpiosim_detach, NULL); 59 60 extern struct cfdriver gpiosim_cd; 61 62 static int 63 gpiosim_match(device_t parent, cfdata_t match, void *aux) 64 { 65 return 1; 66 } 67 68 void 69 gpiosimattach(int num __unused) 70 { 71 cfdata_t cf; 72 int n, err; 73 74 err = config_cfattach_attach(gpiosim_cd.cd_name, &gpiosim_ca); 75 if (err) 76 printf("%s: unable to register cfattach\n", gpiosim_cd.cd_name); 77 78 for (n = 0; n < NGPIOSIM; n++) { 79 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 80 cf->cf_name = "gpiosim"; 81 cf->cf_atname = "gpiosim"; 82 cf->cf_unit = n; 83 cf->cf_fstate = FSTATE_NOTFOUND; 84 config_attach_pseudo(cf); 85 } 86 } 87 88 static void 89 gpiosim_attach(device_t parent, device_t self, void *aux) 90 { 91 struct gpiosim_softc *sc = device_private(self); 92 struct gpiobus_attach_args gba; 93 const struct sysctlnode *node; 94 int i; 95 96 sc->sc_dev = self; 97 98 printf("%s", device_xname(sc->sc_dev)); 99 100 /* initialize pin array */ 101 for (i = 0; i < GPIOSIM_NPINS; i++) { 102 sc->sc_gpio_pins[i].pin_num = i; 103 sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | 104 GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN | 105 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN | 106 GPIO_PIN_INVIN | GPIO_PIN_INVOUT; 107 108 /* read initial state */ 109 sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_INPUT; 110 } 111 sc->sc_state = 0; 112 113 /* create controller tag */ 114 sc->sc_gpio_gc.gp_cookie = sc; 115 sc->sc_gpio_gc.gp_pin_read = gpiosim_pin_read; 116 sc->sc_gpio_gc.gp_pin_write = gpiosim_pin_write; 117 sc->sc_gpio_gc.gp_pin_ctl = gpiosim_pin_ctl; 118 119 /* gba.gba_name = "gpio"; */ 120 gba.gba_gc = &sc->sc_gpio_gc; 121 gba.gba_pins = sc->sc_gpio_pins; 122 gba.gba_npins = GPIOSIM_NPINS; 123 124 pmf_device_register(self, NULL, NULL); 125 126 sysctl_createv(&sc->sc_log, 0, NULL, &node, 127 0, 128 CTLTYPE_NODE, device_xname(sc->sc_dev), 129 SYSCTL_DESCR("GPIO simulator"), 130 NULL, 0, NULL, 0, 131 CTL_HW, CTL_CREATE, CTL_EOL); 132 133 if (node == NULL) { 134 printf(": can't create sysctl node\n"); 135 return; 136 } 137 138 sysctl_createv(&sc->sc_log, 0, &node, NULL, 139 CTLFLAG_READWRITE, 140 CTLTYPE_QUAD, "value", 141 SYSCTL_DESCR("Current GPIO simulator value"), 142 gpiosim_sysctl, 0, (void *)sc, 0, 143 CTL_CREATE, CTL_EOL); 144 145 printf(": simulating %d pins\n", GPIOSIM_NPINS); 146 sc->sc_gdev = config_found_ia(self, "gpiobus", &gba, gpiobus_print); 147 } 148 149 static int 150 gpiosim_detach(device_t self, int flags) 151 { 152 struct gpiosim_softc *sc = device_private(self); 153 154 /* Detach the gpio driver that attached here */ 155 if (sc->sc_gdev != NULL) 156 config_detach(sc->sc_gdev, 0); 157 158 pmf_device_deregister(self); 159 if (sc->sc_log != NULL) { 160 sysctl_teardown(&sc->sc_log); 161 sc->sc_log = NULL; 162 } 163 return 0; 164 } 165 166 static int 167 gpiosim_sysctl(SYSCTLFN_ARGS) 168 { 169 struct sysctlnode node; 170 struct gpiosim_softc *sc; 171 uint64_t val, error; 172 173 node = *rnode; 174 sc = node.sysctl_data; 175 176 node.sysctl_data = &val; 177 178 val = sc->sc_state; 179 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 180 if (error || newp == NULL) 181 return error; 182 183 sc->sc_state = val; 184 return 0; 185 } 186 187 static int 188 gpiosim_pin_read(void *arg, int pin) 189 { 190 struct gpiosim_softc *sc = arg; 191 192 if (sc->sc_state & (1LL << pin)) 193 return GPIO_PIN_HIGH; 194 else 195 return GPIO_PIN_LOW; 196 } 197 198 static void 199 gpiosim_pin_write(void *arg, int pin, int value) 200 { 201 struct gpiosim_softc *sc = arg; 202 203 if (value == 0) 204 sc->sc_state &= ~(1LL << pin); 205 else 206 sc->sc_state |= (1LL << pin); 207 } 208 209 static void 210 gpiosim_pin_ctl(void *arg, int pin, int flags) 211 { 212 struct gpiosim_softc *sc = arg; 213 214 sc->sc_gpio_pins[pin].pin_flags = flags; 215 } 216 217 MODULE(MODULE_CLASS_DRIVER, gpiosim, "gpio"); 218 219 #ifdef _MODULE 220 static const struct cfiattrdata gpiobus_iattrdata = { 221 "gpiobus", 0, { { NULL, NULL, 0 },} 222 }; 223 static const struct cfiattrdata *const gpiosim_attrs[] = { 224 &gpiobus_iattrdata, NULL 225 }; 226 CFDRIVER_DECL(gpiosim, DV_DULL, gpiosim_attrs); 227 extern struct cfattach gpiosim_ca; 228 static int gpiosimloc[] = { 229 -1, 230 -1, 231 -1 232 }; 233 static struct cfdata gpiosim_cfdata[] = { 234 { 235 .cf_name = "gpiosim", 236 .cf_atname = "gpiosim", 237 .cf_unit = 0, 238 .cf_fstate = FSTATE_STAR, 239 .cf_loc = gpiosimloc, 240 .cf_flags = 0, 241 .cf_pspec = NULL, 242 }, 243 { NULL, NULL, 0, FSTATE_NOTFOUND, NULL, 0, NULL } 244 }; 245 #endif 246 247 static int 248 gpiosim_modcmd(modcmd_t cmd, void *opaque) 249 { 250 #ifdef _MODULE 251 int error = 0; 252 #endif 253 switch (cmd) { 254 case MODULE_CMD_INIT: 255 #ifdef _MODULE 256 error = config_cfdriver_attach(&gpiosim_cd); 257 if (error) 258 return error; 259 260 error = config_cfattach_attach(gpiosim_cd.cd_name, 261 &gpiosim_ca); 262 if (error) { 263 config_cfdriver_detach(&gpiosim_cd); 264 aprint_error("%s: unable to register cfattach\n", 265 gpiosim_cd.cd_name); 266 return error; 267 } 268 error = config_cfdata_attach(gpiosim_cfdata, 1); 269 if (error) { 270 config_cfattach_detach(gpiosim_cd.cd_name, 271 &gpiosim_ca); 272 config_cfdriver_detach(&gpiosim_cd); 273 aprint_error("%s: unable to register cfdata\n", 274 gpiosim_cd.cd_name); 275 return error; 276 } 277 config_attach_pseudo(gpiosim_cfdata); 278 #endif 279 return 0; 280 case MODULE_CMD_FINI: 281 #ifdef _MODULE 282 error = config_cfdata_detach(gpiosim_cfdata); 283 if (error) 284 return error; 285 286 config_cfattach_detach(gpiosim_cd.cd_name, &gpiosim_ca); 287 config_cfdriver_detach(&gpiosim_cd); 288 #endif 289 return 0; 290 case MODULE_CMD_AUTOUNLOAD: 291 /* no auto-unload */ 292 return EBUSY; 293 default: 294 return ENOTTY; 295 } 296 } 297
Indexes created Sat Sep 27 14:09:57 GMT 2025