gpioow.c revision 1.9
1 /* $NetBSD: gpioow.c,v 1.9 2009/08/03 17:24:40 mbalmer Exp $ */ 2 /* $OpenBSD: gpioow.c,v 1.1 2006/03/04 16:27:03 grange Exp $ */ 3 4 /* 5 * Copyright (c) 2006 Alexander Yurchenko <grange (at) 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 #include <sys/cdefs.h> 21 __KERNEL_RCSID(0, "$NetBSD: gpioow.c,v 1.9 2009/08/03 17:24:40 mbalmer Exp $"); 22 23 /* 24 * 1-Wire bus bit-banging through GPIO pin. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/device.h> 30 #include <sys/gpio.h> 31 32 #include <dev/gpio/gpiovar.h> 33 34 #include <dev/onewire/onewirevar.h> 35 36 #define GPIOOW_NPINS 1 37 #define GPIOOW_PIN_DATA 0 38 39 struct gpioow_softc { 40 void * sc_gpio; 41 struct gpio_pinmap sc_map; 42 int __map[GPIOOW_NPINS]; 43 44 struct onewire_bus sc_ow_bus; 45 device_t sc_ow_dev; 46 47 int sc_data; 48 int sc_dying; 49 }; 50 51 int gpioow_match(device_t, cfdata_t, void *); 52 void gpioow_attach(device_t, device_t, void *); 53 int gpioow_detach(device_t, int); 54 int gpioow_activate(device_t, enum devact); 55 56 int gpioow_ow_reset(void *); 57 int gpioow_ow_bit(void *, int); 58 59 void gpioow_bb_rx(void *); 60 void gpioow_bb_tx(void *); 61 int gpioow_bb_get(void *); 62 void gpioow_bb_set(void *, int); 63 64 CFATTACH_DECL_NEW(gpioow, sizeof(struct gpioow_softc), 65 gpioow_match, gpioow_attach, gpioow_detach, gpioow_activate); 66 67 extern struct cfdriver gpioow_cd; 68 69 static const struct onewire_bbops gpioow_bbops = { 70 gpioow_bb_rx, 71 gpioow_bb_tx, 72 gpioow_bb_get, 73 gpioow_bb_set 74 }; 75 76 int 77 gpioow_match(device_t parent, cfdata_t cf, void *aux) 78 { 79 struct gpio_attach_args *ga = aux; 80 81 if (strcmp(ga->ga_dvname, cf->cf_name)) 82 return 0; 83 84 if (ga->ga_offset == -1) 85 return 0; 86 87 /* Check that we have enough pins */ 88 if (gpio_npins(ga->ga_mask) != GPIOOW_NPINS) { 89 aprint_debug("%s: invalid pin mask 0x%02x/n", cf->cf_name, 90 ga->ga_mask); 91 return 0; 92 } 93 return 1; 94 } 95 96 void 97 gpioow_attach(device_t parent, device_t self, void *aux) 98 { 99 struct gpioow_softc *sc = device_private(self); 100 struct gpio_attach_args *ga = aux; 101 struct onewirebus_attach_args oba; 102 int caps; 103 104 /* Map pins */ 105 sc->sc_gpio = ga->ga_gpio; 106 sc->sc_map.pm_map = sc->__map; 107 if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask, 108 &sc->sc_map)) { 109 aprint_error(": can't map pins\n"); 110 return; 111 } 112 113 /* Configure data pin */ 114 caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA); 115 if (!(caps & GPIO_PIN_OUTPUT)) { 116 aprint_error(": data pin is unable to drive output\n"); 117 goto fail; 118 } 119 if (!(caps & GPIO_PIN_INPUT)) { 120 aprint_error(": data pin is unable to read input\n"); 121 goto fail; 122 } 123 aprint_normal(": DATA[%d]", sc->sc_map.pm_map[GPIOOW_PIN_DATA]); 124 sc->sc_data = GPIO_PIN_OUTPUT; 125 if (caps & GPIO_PIN_OPENDRAIN) { 126 aprint_normal(" open-drain"); 127 sc->sc_data |= GPIO_PIN_OPENDRAIN; 128 } else if ((caps & GPIO_PIN_PUSHPULL) && (caps & GPIO_PIN_TRISTATE)) { 129 aprint_normal(" push-pull tri-state"); 130 sc->sc_data |= GPIO_PIN_PUSHPULL; 131 } 132 if (caps & GPIO_PIN_PULLUP) { 133 aprint_normal(" pull-up"); 134 sc->sc_data |= GPIO_PIN_PULLUP; 135 } 136 gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, sc->sc_data); 137 138 aprint_normal("\n"); 139 140 /* Attach 1-Wire bus */ 141 sc->sc_ow_bus.bus_cookie = sc; 142 sc->sc_ow_bus.bus_reset = gpioow_ow_reset; 143 sc->sc_ow_bus.bus_bit = gpioow_ow_bit; 144 145 memset(&oba, 0, sizeof(oba)); 146 oba.oba_bus = &sc->sc_ow_bus; 147 sc->sc_ow_dev = config_found(self, &oba, onewirebus_print); 148 149 return; 150 151 fail: 152 gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); 153 } 154 155 int 156 gpioow_detach(device_t self, int flags) 157 { 158 struct gpioow_softc *sc = device_private(self); 159 int rv = 0; 160 161 gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); 162 163 if (sc->sc_ow_dev != NULL) 164 rv = config_detach(sc->sc_ow_dev, flags); 165 166 return rv; 167 } 168 169 int 170 gpioow_activate(device_t self, enum devact act) 171 { 172 struct gpioow_softc *sc = device_private(self); 173 int rv = 0; 174 175 switch (act) { 176 case DVACT_ACTIVATE: 177 return EOPNOTSUPP; 178 case DVACT_DEACTIVATE: 179 sc->sc_dying = 1; 180 if (sc->sc_ow_dev != NULL) 181 rv = config_deactivate(sc->sc_ow_dev); 182 break; 183 } 184 return rv; 185 } 186 187 int 188 gpioow_ow_reset(void *arg) 189 { 190 return (onewire_bb_reset(&gpioow_bbops, arg)); 191 } 192 193 int 194 gpioow_ow_bit(void *arg, int value) 195 { 196 return (onewire_bb_bit(&gpioow_bbops, arg, value)); 197 } 198 199 void 200 gpioow_bb_rx(void *arg) 201 { 202 struct gpioow_softc *sc = arg; 203 int data = sc->sc_data; 204 205 data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); 206 data |= GPIO_PIN_INPUT; 207 if (data & GPIO_PIN_PUSHPULL) 208 data |= GPIO_PIN_TRISTATE; 209 if (sc->sc_data != data) { 210 sc->sc_data = data; 211 gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, 212 sc->sc_data); 213 } 214 } 215 216 void 217 gpioow_bb_tx(void *arg) 218 { 219 struct gpioow_softc *sc = arg; 220 int data = sc->sc_data; 221 222 data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); 223 data |= GPIO_PIN_OUTPUT; 224 if (sc->sc_data != data) { 225 sc->sc_data = data; 226 gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, 227 sc->sc_data); 228 } 229 } 230 231 int 232 gpioow_bb_get(void *arg) 233 { 234 struct gpioow_softc *sc = arg; 235 236 return (gpio_pin_read(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA) == 237 GPIO_PIN_HIGH ? 1 : 0); 238 } 239 240 void 241 gpioow_bb_set(void *arg, int value) 242 { 243 struct gpioow_softc *sc = arg; 244 245 gpio_pin_write(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, 246 value ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 247 } 248
Indexes created Wed Sep 24 02:09:48 GMT 2025