1 /* $NetBSD: gpiosim.c,v 1.14 2012/06/02 21:36:44 dsl Exp $ */ 2 /* $OpenBSD: gpiosim.c,v 1.1 2008/11/23 18:46:49 mbalmer Exp $ */ 3 4 /* 5 * Copyright (c) 2007, 2008, 2009, 2010, 2011 Marc Balmer <marc@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 /* 32 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 #define GPIOSIM_NPINS 32 34 35 struct gpiosim_softc { 36 device_t sc_dev; 37 device_t sc_gdev; /* gpio that attaches here */ 38 uint32_t sc_state; 39 struct gpio_chipset_tag sc_gpio_gc; 40 gpio_pin_t sc_gpio_pins[GPIOSIM_NPINS]; 41 42 struct sysctllog *sc_log; 43 }; 44 45 static int gpiosim_match(device_t, cfdata_t, void *); 46 void gpiosimattach(int); 47 static void gpiosim_attach(device_t, device_t, void *); 48 static int gpiosim_detach(device_t, int); 49 static int gpiosim_sysctl(SYSCTLFN_PROTO); 50 51 static int gpiosim_pin_read(void *, int); 52 static void gpiosim_pin_write(void *, int, int); 53 static void gpiosim_pin_ctl(void *, int, int); 54 55 CFATTACH_DECL_NEW(gpiosim, sizeof(struct gpiosim_softc), gpiosim_match, 56 gpiosim_attach, gpiosim_detach, NULL); 57 58 extern struct cfdriver gpiosim_cd; 59 60 static int 61 gpiosim_match(device_t parent, cfdata_t match, void *aux) 62 { 63 return 1; 64 } 65 66 void 67 gpiosimattach(int num) 68 { 69 cfdata_t cf; 70 int n, err; 71 72 err = config_cfattach_attach(gpiosim_cd.cd_name, &gpiosim_ca); 73 if (err) 74 printf("%s: unable to register cfattach\n", gpiosim_cd.cd_name); 75 76 for (n = 0; n < num; n++) { 77 cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); 78 cf->cf_name = "gpiosim"; 79 cf->cf_atname = "gpiosim"; 80 cf->cf_unit = n; 81 cf->cf_fstate = FSTATE_NOTFOUND; 82 config_attach_pseudo(cf); 83 } 84 } 85 86 static void 87 gpiosim_attach(device_t parent, device_t self, void *aux) 88 { 89 struct gpiosim_softc *sc = device_private(self); 90 struct gpiobus_attach_args gba; 91 const struct sysctlnode *node; 92 int i; 93 94 sc->sc_dev = self; 95 96 printf("%s", device_xname(sc->sc_dev)); 97 98 /* initialize pin array */ 99 for (i = 0; i < GPIOSIM_NPINS; i++) { 100 sc->sc_gpio_pins[i].pin_num = i; 101 sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | 102 GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN | 103 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN | 104 GPIO_PIN_INVIN | GPIO_PIN_INVOUT; 105 106 /* read initial state */ 107 sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_INPUT; 108 sc->sc_state = 0; 109 110 /* create controller tag */ 111 sc->sc_gpio_gc.gp_cookie = sc; 112 sc->sc_gpio_gc.gp_pin_read = gpiosim_pin_read; 113 sc->sc_gpio_gc.gp_pin_write = gpiosim_pin_write; 114 sc->sc_gpio_gc.gp_pin_ctl = gpiosim_pin_ctl; 115 116 /* gba.gba_name = "gpio"; */ 117 gba.gba_gc = &sc->sc_gpio_gc; 118 gba.gba_pins = sc->sc_gpio_pins; 119 gba.gba_npins = GPIOSIM_NPINS; 120 } 121 122 pmf_device_register(self, NULL, NULL); 123 124 sysctl_createv(NULL, 0, NULL, NULL, 125 CTLFLAG_PERMANENT, 126 CTLTYPE_NODE, "hw", NULL, 127 NULL, 0, NULL, 0, 128 CTL_HW, CTL_EOL); 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 printf(": can't create sysctl node\n"); 138 return; 139 } 140 141 sysctl_createv(&sc->sc_log, 0, &node, NULL, 142 CTLFLAG_READWRITE, 143 CTLTYPE_INT, "value", 144 SYSCTL_DESCR("Current GPIO simulator value"), 145 gpiosim_sysctl, 0, (void *)sc, 0, 146 CTL_CREATE, CTL_EOL); 147 148 printf(": 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 int 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 & (1 << 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 &= ~(1 << pin); 208 else 209 sc->sc_state |= (1 << 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 int error = 0; 255 #endif 256 switch (cmd) { 257 case MODULE_CMD_INIT: 258 #ifdef _MODULE 259 error = config_cfdriver_attach(&gpiosim_cd); 260 if (error) 261 return error; 262 263 error = config_cfattach_attach(gpiosim_cd.cd_name, 264 &gpiosim_ca); 265 if (error) { 266 config_cfdriver_detach(&gpiosim_cd); 267 aprint_error("%s: unable to register cfattach\n", 268 gpiosim_cd.cd_name); 269 return error; 270 } 271 error = config_cfdata_attach(gpiosim_cfdata, 1); 272 if (error) { 273 config_cfattach_detach(gpiosim_cd.cd_name, 274 &gpiosim_ca); 275 config_cfdriver_detach(&gpiosim_cd); 276 aprint_error("%s: unable to register cfdata\n", 277 gpiosim_cd.cd_name); 278 return error; 279 } 280 config_attach_pseudo(gpiosim_cfdata); 281 #endif 282 return 0; 283 case MODULE_CMD_FINI: 284 #ifdef _MODULE 285 error = config_cfdata_detach(gpiosim_cfdata); 286 if (error) 287 return error; 288 289 config_cfattach_detach(gpiosim_cd.cd_name, &gpiosim_ca); 290 config_cfdriver_detach(&gpiosim_cd); 291 #endif 292 return 0; 293 case MODULE_CMD_AUTOUNLOAD: 294 /* no auto-unload */ 295 return EBUSY; 296 default: 297 return ENOTTY; 298 } 299 } 300