gpiosim.c revision 1.6.2.2
1 /* $NetBSD: gpiosim.c,v 1.6.2.2 2009/08/19 18:47:06 yamt Exp $ */ 2 /* $OpenBSD: gpiosim.c,v 1.1 2008/11/23 18:46:49 mbalmer Exp $ */ 3 4 /* 5 * Copyright (c) 2007, 2008, 2009 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 /* 32 bit wide GPIO simulator */ 22 #include <sys/param.h> 23 #include <sys/systm.h> 24 #include <sys/device.h> 25 #include <sys/gpio.h> 26 #include <sys/malloc.h> 27 #include <sys/sysctl.h> 28 #include <sys/ioccom.h> 29 30 #include <dev/gpio/gpiovar.h> 31 32 #define GPIOSIM_NPINS 32 33 34 struct gpiosim_softc { 35 device_t sc_dev; 36 device_t sc_gdev; /* gpio that attaches here */ 37 u_int32_t sc_state; 38 struct gpio_chipset_tag sc_gpio_gc; 39 gpio_pin_t sc_gpio_pins[GPIOSIM_NPINS]; 40 41 struct sysctllog *sc_log; 42 }; 43 44 int gpiosim_match(device_t, cfdata_t, void *); 45 void gpiosimattach(int); 46 void gpiosim_attach(device_t, device_t, void *); 47 int gpiosim_detach(device_t, int); 48 int gpiosim_activate(device_t, enum devact); 49 int gpiosim_sysctl(SYSCTLFN_PROTO); 50 51 int gpiosim_pin_read(void *, int); 52 void gpiosim_pin_write(void *, int, int); 53 void gpiosim_pin_ctl(void *, int, int); 54 55 CFATTACH_DECL_NEW(gpiosim, sizeof(struct gpiosim_softc), gpiosim_match, 56 gpiosim_attach, gpiosim_detach, gpiosim_activate); 57 58 extern struct cfdriver gpiosim_cd; 59 60 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 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, 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 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 int 170 gpiosim_activate(device_t self, enum devact act) 171 { 172 switch (act) { 173 case DVACT_ACTIVATE: 174 return EOPNOTSUPP; 175 case DVACT_DEACTIVATE: 176 break; 177 } 178 return 0; 179 } 180 181 int 182 gpiosim_sysctl(SYSCTLFN_ARGS) 183 { 184 struct sysctlnode node; 185 struct gpiosim_softc *sc; 186 int val, error; 187 188 node = *rnode; 189 sc = node.sysctl_data; 190 191 node.sysctl_data = &val; 192 193 val = sc->sc_state; 194 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 195 if (error || newp == NULL) 196 return error; 197 198 sc->sc_state = val; 199 return 0; 200 } 201 202 int 203 gpiosim_pin_read(void *arg, int pin) 204 { 205 struct gpiosim_softc *sc = arg; 206 207 if (sc->sc_state & (1 << pin)) 208 return GPIO_PIN_HIGH; 209 else 210 return GPIO_PIN_LOW; 211 } 212 213 void 214 gpiosim_pin_write(void *arg, int pin, int value) 215 { 216 struct gpiosim_softc *sc = arg; 217 218 if (value == 0) 219 sc->sc_state &= ~(1 << pin); 220 else 221 sc->sc_state |= (1 << pin); 222 } 223 224 void 225 gpiosim_pin_ctl(void *arg, int pin, int flags) 226 { 227 struct gpiosim_softc *sc = arg; 228 229 sc->sc_gpio_pins[pin].pin_flags = flags; 230 } 231
Indexes created Sun Sep 28 16:09:52 GMT 2025