1 /*- 2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bio.h> 33 #include <sys/bus.h> 34 #include <sys/conf.h> 35 #include <sys/kernel.h> 36 #include <sys/kthread.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/mutex.h> 41 42 #include <dev/led/led.h> 43 #include <sys/gpio.h> 44 #include "gpiobus_if.h" 45 46 /* 47 * Only one pin for led 48 */ 49 #define GPIOLED_PIN 0 50 51 #define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 52 #define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 53 #define GPIOLED_LOCK_INIT(_sc) \ 54 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 55 "gpioled", MTX_DEF) 56 #define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 57 58 struct gpioled_softc 59 { 60 device_t sc_dev; 61 device_t sc_busdev; 62 struct mtx sc_mtx; 63 struct cdev *sc_leddev; 64 }; 65 66 static void gpioled_control(void *, int); 67 static int gpioled_probe(device_t); 68 static int gpioled_attach(device_t); 69 static int gpioled_detach(device_t); 70 71 static void 72 gpioled_control(void *priv, int onoff) 73 { 74 struct gpioled_softc *sc = priv; 75 GPIOLED_LOCK(sc); 76 GPIOBUS_LOCK_BUS(sc->sc_busdev); 77 GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev); 78 GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 79 GPIO_PIN_OUTPUT); 80 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 81 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 82 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev); 83 GPIOBUS_UNLOCK_BUS(sc->sc_busdev); 84 GPIOLED_UNLOCK(sc); 85 } 86 87 static int 88 gpioled_probe(device_t dev) 89 { 90 device_set_desc(dev, "GPIO led"); 91 return (0); 92 } 93 94 static int 95 gpioled_attach(device_t dev) 96 { 97 struct gpioled_softc *sc; 98 const char *name; 99 100 sc = device_get_softc(dev); 101 sc->sc_dev = dev; 102 sc->sc_busdev = device_get_parent(dev); 103 GPIOLED_LOCK_INIT(sc); 104 if (resource_string_value(device_get_name(dev), 105 device_get_unit(dev), "name", &name)) 106 name = NULL; 107 108 sc->sc_leddev = led_create(gpioled_control, sc, name ? name : 109 device_get_nameunit(dev)); 110 111 return (0); 112 } 113 114 static int 115 gpioled_detach(device_t dev) 116 { 117 struct gpioled_softc *sc; 118 119 sc = device_get_softc(dev); 120 if (sc->sc_leddev) { 121 led_destroy(sc->sc_leddev); 122 sc->sc_leddev = NULL; 123 } 124 GPIOLED_LOCK_DESTROY(sc); 125 return (0); 126 } 127 128 static devclass_t gpioled_devclass; 129 130 static device_method_t gpioled_methods[] = { 131 /* Device interface */ 132 DEVMETHOD(device_probe, gpioled_probe), 133 DEVMETHOD(device_attach, gpioled_attach), 134 DEVMETHOD(device_detach, gpioled_detach), 135 136 { 0, 0 } 137 }; 138 139 static driver_t gpioled_driver = { 140 "gpioled", 141 gpioled_methods, 142 sizeof(struct gpioled_softc), 143 }; 144 145 DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 146