gpioled.c revision 213237
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 ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: head/sys/dev/gpio/gpioled.c 213237 2010-09-28 03:24:53Z gonzo $"); 28 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/bio.h> 32#include <sys/bus.h> 33#include <sys/conf.h> 34#include <sys/kernel.h> 35#include <sys/kthread.h> 36#include <sys/lock.h> 37#include <sys/malloc.h> 38#include <sys/module.h> 39#include <sys/mutex.h> 40 41#include <dev/led/led.h> 42#include <sys/gpio.h> 43#include "gpiobus_if.h" 44 45/* 46 * Only one pin for led 47 */ 48#define GPIOLED_PIN 0 49 50#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 51#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 52#define GPIOLED_LOCK_INIT(_sc) \ 53 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 54 "gpioled", MTX_DEF) 55#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 56 57struct gpioled_softc 58{ 59 device_t sc_dev; 60 device_t sc_busdev; 61 struct mtx sc_mtx; 62 struct cdev *sc_leddev; 63}; 64 65static void gpioled_control(void *, int); 66static int gpioled_probe(device_t); 67static int gpioled_attach(device_t); 68static int gpioled_detach(device_t); 69 70static void 71gpioled_control(void *priv, int onoff) 72{ 73 struct gpioled_softc *sc = priv; 74 GPIOLED_LOCK(sc); 75 GPIOBUS_LOCK_BUS(sc->sc_busdev); 76 GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev); 77 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 78 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 79 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev); 80 GPIOBUS_UNLOCK_BUS(sc->sc_busdev); 81 GPIOLED_UNLOCK(sc); 82} 83 84static int 85gpioled_probe(device_t dev) 86{ 87 device_set_desc(dev, "GPIO led"); 88 return (0); 89} 90 91static int 92gpioled_attach(device_t dev) 93{ 94 struct gpioled_softc *sc; 95 const char *name; 96 97 sc = device_get_softc(dev); 98 sc->sc_dev = dev; 99 sc->sc_busdev = device_get_parent(dev); 100 GPIOLED_LOCK_INIT(sc); 101 if (resource_string_value(device_get_name(dev), 102 device_get_unit(dev), "name", &name)) 103 name = NULL; 104 105 sc->sc_leddev = led_create(gpioled_control, sc, name ? name : 106 device_get_nameunit(dev)); 107 108 return (0); 109} 110 111static int 112gpioled_detach(device_t dev) 113{ 114 struct gpioled_softc *sc; 115 116 sc = device_get_softc(dev); 117 if (sc->sc_leddev) { 118 led_destroy(sc->sc_leddev); 119 sc->sc_leddev = NULL; 120 } 121 GPIOLED_LOCK_DESTROY(sc); 122 return (0); 123} 124 125static devclass_t gpioled_devclass; 126 127static device_method_t gpioled_methods[] = { 128 /* Device interface */ 129 DEVMETHOD(device_probe, gpioled_probe), 130 DEVMETHOD(device_attach, gpioled_attach), 131 DEVMETHOD(device_detach, gpioled_detach), 132 133 { 0, 0 } 134}; 135 136static driver_t gpioled_driver = { 137 "gpioled", 138 gpioled_methods, 139 sizeof(struct gpioled_softc), 140}; 141 142DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 143