gpiosim.c revision 1.20.4.1
1 /* $NetBSD: gpiosim.c,v 1.20.4.1 2017/05/17 01:44:17 pgoyette 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 #include "ioconf.h" 35 36 #define GPIOSIM_NPINS 64 37 38 struct gpiosim_softc { 39 device_t sc_dev; 40 device_t sc_gdev; /* gpio that attaches here */ 41 uint64_t sc_state; 42 struct gpio_chipset_tag sc_gpio_gc; 43 gpio_pin_t sc_gpio_pins[GPIOSIM_NPINS]; 44 45 struct sysctllog *sc_log; 46 }; 47 48 static int gpiosim_match(device_t, cfdata_t, void *); 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 device_t dev; 72 cfdata_t cf; 73 int n, err; 74 75 err = config_cfattach_attach(gpiosim_cd.cd_name, &gpiosim_ca); 76 if (err) 77 printf("%s: unable to register cfattach\n", gpiosim_cd.cd_name); 78 79 for (n = 0; n < NGPIOSIM; n++) { 80 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 81 cf->cf_name = "gpiosim"; 82 cf->cf_atname = "gpiosim"; 83 cf->cf_unit = n; 84 cf->cf_fstate = FSTATE_NOTFOUND; 85 dev = config_attach_pseudo(cf); 86 device_release(dev); 87 } 88 } 89 90 static void 91 gpiosim_attach(device_t parent, device_t self, void *aux) 92 { 93 struct gpiosim_softc *sc = device_private(self); 94 struct gpiobus_attach_args gba; 95 const struct sysctlnode *node; 96 int i; 97 98 sc->sc_dev = self; 99 100 printf("%s", device_xname(sc->sc_dev)); 101 102 /* initialize pin array */ 103 for (i = 0; i < GPIOSIM_NPINS; i++) { 104 sc->sc_gpio_pins[i].pin_num = i; 105 sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | 106 GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN | 107 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN | 108 GPIO_PIN_INVIN | GPIO_PIN_INVOUT; 109 110 /* read initial state */ 111 sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_INPUT; 112 } 113 sc->sc_state = 0; 114 115 /* create controller tag */ 116 sc->sc_gpio_gc.gp_cookie = sc; 117 sc->sc_gpio_gc.gp_pin_read = gpiosim_pin_read; 118 sc->sc_gpio_gc.gp_pin_write = gpiosim_pin_write; 119 sc->sc_gpio_gc.gp_pin_ctl = gpiosim_pin_ctl; 120 121 /* gba.gba_name = "gpio"; */ 122 gba.gba_gc = &sc->sc_gpio_gc; 123 gba.gba_pins = sc->sc_gpio_pins; 124 gba.gba_npins = GPIOSIM_NPINS; 125 126 if (!pmf_device_register(self, NULL, NULL)) 127 aprint_error_dev(self, "couldn't establish power handler\n"); 128 129 sysctl_createv(&sc->sc_log, 0, NULL, &node, 130 0, 131 CTLTYPE_NODE, device_xname(sc->sc_dev), 132 SYSCTL_DESCR("GPIO simulator"), 133 NULL, 0, NULL, 0, 134 CTL_HW, CTL_CREATE, CTL_EOL); 135 136 if (node == NULL) { 137 aprint_error(": can't create sysctl node\n"); 138 return; 139 } 140 141 sysctl_createv(&sc->sc_log, 0, &node, NULL, 142 CTLFLAG_READWRITE, 143 CTLTYPE_QUAD, "value", 144 SYSCTL_DESCR("Current GPIO simulator value"), 145 gpiosim_sysctl, 0, (void *)sc, 0, 146 CTL_CREATE, CTL_EOL); 147 148 aprint_normal(": simulating %d pins\n", GPIOSIM_NPINS); 149 sc->sc_gdev = config_found_ia(self, "gpiobus", &gba, gpiobus_print); 150 } 151 152 static int 153 gpiosim_detach(device_t self, int flags) 154 { 155 struct gpiosim_softc *sc = device_private(self); 156 157 /* Detach the gpio driver that attached here */ 158 if (sc->sc_gdev != NULL) 159 config_detach(sc->sc_gdev, 0); 160 161 pmf_device_deregister(self); 162 if (sc->sc_log != NULL) { 163 sysctl_teardown(&sc->sc_log); 164 sc->sc_log = NULL; 165 } 166 return 0; 167 } 168 169 static int 170 gpiosim_sysctl(SYSCTLFN_ARGS) 171 { 172 struct sysctlnode node; 173 struct gpiosim_softc *sc; 174 uint64_t val, error; 175 176 node = *rnode; 177 sc = node.sysctl_data; 178 179 node.sysctl_data = &val; 180 181 val = sc->sc_state; 182 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 183 if (error || newp == NULL) 184 return error; 185 186 sc->sc_state = val; 187 return 0; 188 } 189 190 static int 191 gpiosim_pin_read(void *arg, int pin) 192 { 193 struct gpiosim_softc *sc = arg; 194 195 if (sc->sc_state & (1LL << pin)) 196 return GPIO_PIN_HIGH; 197 else 198 return GPIO_PIN_LOW; 199 } 200 201 static void 202 gpiosim_pin_write(void *arg, int pin, int value) 203 { 204 struct gpiosim_softc *sc = arg; 205 206 if (value == 0) 207 sc->sc_state &= ~(1LL << pin); 208 else 209 sc->sc_state |= (1LL << pin); 210 } 211 212 static void 213 gpiosim_pin_ctl(void *arg, int pin, int flags) 214 { 215 struct gpiosim_softc *sc = arg; 216 217 sc->sc_gpio_pins[pin].pin_flags = flags; 218 } 219 220 MODULE(MODULE_CLASS_DRIVER, gpiosim, "gpio"); 221 222 #ifdef _MODULE 223 static const struct cfiattrdata gpiobus_iattrdata = { 224 "gpiobus", 0, { { NULL, NULL, 0 },} 225 }; 226 static const struct cfiattrdata *const gpiosim_attrs[] = { 227 &gpiobus_iattrdata, NULL 228 }; 229 CFDRIVER_DECL(gpiosim, DV_DULL, gpiosim_attrs); 230 extern struct cfattach gpiosim_ca; 231 static int gpiosimloc[] = { 232 -1, 233 -1, 234 -1 235 }; 236 static struct cfdata gpiosim_cfdata[] = { 237 { 238 .cf_name = "gpiosim", 239 .cf_atname = "gpiosim", 240 .cf_unit = 0, 241 .cf_fstate = FSTATE_STAR, 242 .cf_loc = gpiosimloc, 243 .cf_flags = 0, 244 .cf_pspec = NULL, 245 }, 246 { NULL, NULL, 0, FSTATE_NOTFOUND, NULL, 0, NULL } 247 }; 248 #endif 249 250 static int 251 gpiosim_modcmd(modcmd_t cmd, void *opaque) 252 { 253 #ifdef _MODULE 254 device_t dev; 255 int error = 0; 256 #endif 257 switch (cmd) { 258 case MODULE_CMD_INIT: 259 #ifdef _MODULE 260 error = config_cfdriver_attach(&gpiosim_cd); 261 if (error) 262 return error; 263 264 error = config_cfattach_attach(gpiosim_cd.cd_name, 265 &gpiosim_ca); 266 if (error) { 267 config_cfdriver_detach(&gpiosim_cd); 268 aprint_error("%s: unable to register cfattach\n", 269 gpiosim_cd.cd_name); 270 return error; 271 } 272 error = config_cfdata_attach(gpiosim_cfdata, 1); 273 if (error) { 274 config_cfattach_detach(gpiosim_cd.cd_name, 275 &gpiosim_ca); 276 config_cfdriver_detach(&gpiosim_cd); 277 aprint_error("%s: unable to register cfdata\n", 278 gpiosim_cd.cd_name); 279 return error; 280 } 281 dev = config_attach_pseudo(gpiosim_cfdata); 282 device_release(dev); 283 #endif 284 return 0; 285 case MODULE_CMD_FINI: 286 #ifdef _MODULE 287 error = config_cfdata_detach(gpiosim_cfdata); 288 if (error) 289 return error; 290 291 config_cfattach_detach(gpiosim_cd.cd_name, &gpiosim_ca); 292 config_cfdriver_detach(&gpiosim_cd); 293 #endif 294 return 0; 295 case MODULE_CMD_AUTOUNLOAD: 296 /* no auto-unload */ 297 return EBUSY; 298 default: 299 return ENOTTY; 300 } 301 } 302
Indexes created Mon Sep 29 21:09:56 GMT 2025