| 1 | /* $NetBSD: gpioow.c,v 1.14 2011/09/07 07:43:05 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@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 1.14 2011/09/07 07:43:05 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 | #include <sys/module.h> |
| 32 | |
| 33 | #include <dev/gpio/gpiovar.h> |
| 34 | |
| 35 | #include <dev/onewire/onewirevar.h> |
| 36 | |
| 37 | #define GPIOOW_NPINS 1 |
| 38 | #define GPIOOW_PIN_DATA 0 |
| 39 | |
| 40 | struct gpioow_softc { |
| 41 | void * sc_gpio; |
| 42 | struct gpio_pinmap sc_map; |
| 43 | int _map[GPIOOW_NPINS]; |
| 44 | |
| 45 | struct onewire_bus sc_ow_bus; |
| 46 | device_t sc_ow_dev; |
| 47 | |
| 48 | int sc_data; |
| 49 | int sc_dying; |
| 50 | }; |
| 51 | |
| 52 | int gpioow_match(device_t, cfdata_t, void *); |
| 53 | void gpioow_attach(device_t, device_t, void *); |
| 54 | int gpioow_detach(device_t, int); |
| 55 | int gpioow_activate(device_t, enum devact); |
| 56 | |
| 57 | int gpioow_ow_reset(void *); |
| 58 | int gpioow_ow_bit(void *, int); |
| 59 | |
| 60 | void gpioow_bb_rx(void *); |
| 61 | void gpioow_bb_tx(void *); |
| 62 | int gpioow_bb_get(void *); |
| 63 | void gpioow_bb_set(void *, int); |
| 64 | |
| 65 | CFATTACH_DECL_NEW(gpioow, sizeof(struct gpioow_softc), |
| 66 | gpioow_match, gpioow_attach, gpioow_detach, gpioow_activate); |
| 67 | |
| 68 | extern struct cfdriver gpioow_cd; |
| 69 | |
| 70 | static const struct onewire_bbops gpioow_bbops = { |
| 71 | gpioow_bb_rx, |
| 72 | gpioow_bb_tx, |
| 73 | gpioow_bb_get, |
| 74 | gpioow_bb_set |
| 75 | }; |
| 76 | |
| 77 | int |
| 78 | gpioow_match(device_t parent, cfdata_t cf, void *aux) |
| 79 | { |
| 80 | struct gpio_attach_args *ga = aux; |
| 81 | |
| 82 | if (strcmp(ga->ga_dvname, cf->cf_name)) |
| 83 | return 0; |
| 84 | |
| 85 | if (ga->ga_offset == -1) |
| 86 | return 0; |
| 87 | |
| 88 | /* Check that we have enough pins */ |
| 89 | if (gpio_npins(ga->ga_mask) != GPIOOW_NPINS) { |
| 90 | aprint_debug("%s: invalid pin mask 0x%02x\n" , cf->cf_name, |
| 91 | ga->ga_mask); |
| 92 | return 0; |
| 93 | } |
| 94 | return 1; |
| 95 | } |
| 96 | |
| 97 | void |
| 98 | gpioow_attach(device_t parent, device_t self, void *aux) |
| 99 | { |
| 100 | struct gpioow_softc *sc = device_private(self); |
| 101 | struct gpio_attach_args *ga = aux; |
| 102 | struct onewirebus_attach_args oba; |
| 103 | int caps; |
| 104 | |
| 105 | /* Map pins */ |
| 106 | sc->sc_gpio = ga->ga_gpio; |
| 107 | sc->sc_map.pm_map = sc->_map; |
| 108 | if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask, |
| 109 | &sc->sc_map)) { |
| 110 | aprint_error(": can't map pins\n" ); |
| 111 | goto finish; |
| 112 | } |
| 113 | |
| 114 | /* Configure data pin */ |
| 115 | caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA); |
| 116 | if (!(caps & GPIO_PIN_OUTPUT)) { |
| 117 | aprint_error(": data pin is unable to drive output\n" ); |
| 118 | gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); |
| 119 | goto finish; |
| 120 | } |
| 121 | if (!(caps & GPIO_PIN_INPUT)) { |
| 122 | aprint_error(": data pin is unable to read input\n" ); |
| 123 | gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); |
| 124 | goto finish; |
| 125 | } |
| 126 | aprint_normal(": DATA[%d]" , sc->sc_map.pm_map[GPIOOW_PIN_DATA]); |
| 127 | sc->sc_data = GPIO_PIN_OUTPUT; |
| 128 | if (caps & GPIO_PIN_OPENDRAIN) { |
| 129 | aprint_normal(" open-drain" ); |
| 130 | sc->sc_data |= GPIO_PIN_OPENDRAIN; |
| 131 | } else if ((caps & GPIO_PIN_PUSHPULL) && (caps & GPIO_PIN_TRISTATE)) { |
| 132 | aprint_normal(" push-pull tri-state" ); |
| 133 | sc->sc_data |= GPIO_PIN_PUSHPULL; |
| 134 | } |
| 135 | if (caps & GPIO_PIN_PULLUP) { |
| 136 | aprint_normal(" pull-up" ); |
| 137 | sc->sc_data |= GPIO_PIN_PULLUP; |
| 138 | } |
| 139 | gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, sc->sc_data); |
| 140 | |
| 141 | aprint_normal("\n" ); |
| 142 | |
| 143 | /* Attach 1-Wire bus */ |
| 144 | sc->sc_ow_bus.bus_cookie = sc; |
| 145 | sc->sc_ow_bus.bus_reset = gpioow_ow_reset; |
| 146 | sc->sc_ow_bus.bus_bit = gpioow_ow_bit; |
| 147 | |
| 148 | memset(&oba, 0, sizeof(oba)); |
| 149 | oba.oba_bus = &sc->sc_ow_bus; |
| 150 | sc->sc_ow_dev = config_found(self, &oba, onewirebus_print); |
| 151 | |
| 152 | if (!pmf_device_register(self, NULL, NULL)) |
| 153 | aprint_error("%s: could not establish power handler\n" , |
| 154 | device_xname(self)); |
| 155 | finish: |
| 156 | return; |
| 157 | } |
| 158 | |
| 159 | int |
| 160 | gpioow_detach(device_t self, int flags) |
| 161 | { |
| 162 | struct gpioow_softc *sc = device_private(self); |
| 163 | int rv = 0; |
| 164 | |
| 165 | if (sc->sc_ow_dev != NULL) |
| 166 | rv = config_detach(sc->sc_ow_dev, flags); |
| 167 | |
| 168 | if (!rv) { |
| 169 | gpio_pin_unmap(sc->sc_gpio, &sc->sc_map); |
| 170 | pmf_device_deregister(self); |
| 171 | } |
| 172 | return rv; |
| 173 | } |
| 174 | |
| 175 | int |
| 176 | gpioow_activate(device_t self, enum devact act) |
| 177 | { |
| 178 | struct gpioow_softc *sc = device_private(self); |
| 179 | |
| 180 | switch (act) { |
| 181 | case DVACT_DEACTIVATE: |
| 182 | sc->sc_dying = 1; |
| 183 | return 0; |
| 184 | default: |
| 185 | return EOPNOTSUPP; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | int |
| 190 | gpioow_ow_reset(void *arg) |
| 191 | { |
| 192 | return (onewire_bb_reset(&gpioow_bbops, arg)); |
| 193 | } |
| 194 | |
| 195 | int |
| 196 | gpioow_ow_bit(void *arg, int value) |
| 197 | { |
| 198 | return (onewire_bb_bit(&gpioow_bbops, arg, value)); |
| 199 | } |
| 200 | |
| 201 | void |
| 202 | gpioow_bb_rx(void *arg) |
| 203 | { |
| 204 | struct gpioow_softc *sc = arg; |
| 205 | int data = sc->sc_data; |
| 206 | |
| 207 | data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); |
| 208 | data |= GPIO_PIN_INPUT; |
| 209 | if (data & GPIO_PIN_PUSHPULL) |
| 210 | data |= GPIO_PIN_TRISTATE; |
| 211 | if (sc->sc_data != data) { |
| 212 | sc->sc_data = data; |
| 213 | gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, |
| 214 | sc->sc_data); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | void |
| 219 | gpioow_bb_tx(void *arg) |
| 220 | { |
| 221 | struct gpioow_softc *sc = arg; |
| 222 | int data = sc->sc_data; |
| 223 | |
| 224 | data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE); |
| 225 | data |= GPIO_PIN_OUTPUT; |
| 226 | if (sc->sc_data != data) { |
| 227 | sc->sc_data = data; |
| 228 | gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, |
| 229 | sc->sc_data); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | int |
| 234 | gpioow_bb_get(void *arg) |
| 235 | { |
| 236 | struct gpioow_softc *sc = arg; |
| 237 | |
| 238 | return (gpio_pin_read(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA) == |
| 239 | GPIO_PIN_HIGH ? 1 : 0); |
| 240 | } |
| 241 | |
| 242 | void |
| 243 | gpioow_bb_set(void *arg, int value) |
| 244 | { |
| 245 | struct gpioow_softc *sc = arg; |
| 246 | |
| 247 | gpio_pin_write(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, |
| 248 | value ? GPIO_PIN_HIGH : GPIO_PIN_LOW); |
| 249 | } |
| 250 | |
| 251 | MODULE(MODULE_CLASS_DRIVER, gpioow, "gpio,onewire" ); |
| 252 | |
| 253 | #ifdef _MODULE |
| 254 | #include "ioconf.c" |
| 255 | #endif |
| 256 | |
| 257 | static int |
| 258 | gpioow_modcmd(modcmd_t cmd, void *opaque) |
| 259 | { |
| 260 | int error; |
| 261 | |
| 262 | error = 0; |
| 263 | switch (cmd) { |
| 264 | case MODULE_CMD_INIT: |
| 265 | #ifdef _MODULE |
| 266 | error = config_init_component(cfdriver_ioconf_gpioow, |
| 267 | cfattach_ioconf_gpioow, cfdata_ioconf_gpioow); |
| 268 | if (error) |
| 269 | aprint_error("%s: unable to init component\n" , |
| 270 | gpioow_cd.cd_name); |
| 271 | #endif |
| 272 | break; |
| 273 | case MODULE_CMD_FINI: |
| 274 | #ifdef _MODULE |
| 275 | config_fini_component(cfdriver_ioconf_gpioow, |
| 276 | cfattach_ioconf_gpioow, cfdata_ioconf_gpioow); |
| 277 | #endif |
| 278 | break; |
| 279 | default: |
| 280 | error = ENOTTY; |
| 281 | } |
| 282 | return error; |
| 283 | } |
| 284 | |