gpioled.c revision 213277
1213237Sgonzo/*- 2213237Sgonzo * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org> 3213237Sgonzo * All rights reserved. 4213237Sgonzo * 5213237Sgonzo * Redistribution and use in source and binary forms, with or without 6213237Sgonzo * modification, are permitted provided that the following conditions 7213237Sgonzo * are met: 8213237Sgonzo * 1. Redistributions of source code must retain the above copyright 9213237Sgonzo * notice, this list of conditions and the following disclaimer. 10213237Sgonzo * 2. Redistributions in binary form must reproduce the above copyright 11213237Sgonzo * notice, this list of conditions and the following disclaimer in the 12213237Sgonzo * documentation and/or other materials provided with the distribution. 13213237Sgonzo * 14213277Sgonzo * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15213277Sgonzo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16213277Sgonzo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17213277Sgonzo * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18213277Sgonzo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19213277Sgonzo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20213277Sgonzo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21213277Sgonzo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22213277Sgonzo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23213277Sgonzo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24213277Sgonzo * SUCH DAMAGE. 25213237Sgonzo */ 26213237Sgonzo 27213237Sgonzo#include <sys/cdefs.h> 28213237Sgonzo__FBSDID("$FreeBSD: head/sys/dev/gpio/gpioled.c 213277 2010-09-29 20:53:33Z gonzo $"); 29213237Sgonzo 30213237Sgonzo#include <sys/param.h> 31213237Sgonzo#include <sys/systm.h> 32213237Sgonzo#include <sys/bio.h> 33213237Sgonzo#include <sys/bus.h> 34213237Sgonzo#include <sys/conf.h> 35213237Sgonzo#include <sys/kernel.h> 36213237Sgonzo#include <sys/kthread.h> 37213237Sgonzo#include <sys/lock.h> 38213237Sgonzo#include <sys/malloc.h> 39213237Sgonzo#include <sys/module.h> 40213237Sgonzo#include <sys/mutex.h> 41213237Sgonzo 42213237Sgonzo#include <dev/led/led.h> 43213237Sgonzo#include <sys/gpio.h> 44213237Sgonzo#include "gpiobus_if.h" 45213237Sgonzo 46213237Sgonzo/* 47213237Sgonzo * Only one pin for led 48213237Sgonzo */ 49213237Sgonzo#define GPIOLED_PIN 0 50213237Sgonzo 51213237Sgonzo#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 52213237Sgonzo#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 53213237Sgonzo#define GPIOLED_LOCK_INIT(_sc) \ 54213237Sgonzo mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 55213237Sgonzo "gpioled", MTX_DEF) 56213237Sgonzo#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 57213237Sgonzo 58213237Sgonzostruct gpioled_softc 59213237Sgonzo{ 60213237Sgonzo device_t sc_dev; 61213237Sgonzo device_t sc_busdev; 62213237Sgonzo struct mtx sc_mtx; 63213237Sgonzo struct cdev *sc_leddev; 64213237Sgonzo}; 65213237Sgonzo 66213237Sgonzostatic void gpioled_control(void *, int); 67213237Sgonzostatic int gpioled_probe(device_t); 68213237Sgonzostatic int gpioled_attach(device_t); 69213237Sgonzostatic int gpioled_detach(device_t); 70213237Sgonzo 71213237Sgonzostatic void 72213237Sgonzogpioled_control(void *priv, int onoff) 73213237Sgonzo{ 74213237Sgonzo struct gpioled_softc *sc = priv; 75213237Sgonzo GPIOLED_LOCK(sc); 76213237Sgonzo GPIOBUS_LOCK_BUS(sc->sc_busdev); 77213237Sgonzo GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev); 78213237Sgonzo GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 79213237Sgonzo onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 80213237Sgonzo GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev); 81213237Sgonzo GPIOBUS_UNLOCK_BUS(sc->sc_busdev); 82213237Sgonzo GPIOLED_UNLOCK(sc); 83213237Sgonzo} 84213237Sgonzo 85213237Sgonzostatic int 86213237Sgonzogpioled_probe(device_t dev) 87213237Sgonzo{ 88213237Sgonzo device_set_desc(dev, "GPIO led"); 89213237Sgonzo return (0); 90213237Sgonzo} 91213237Sgonzo 92213237Sgonzostatic int 93213237Sgonzogpioled_attach(device_t dev) 94213237Sgonzo{ 95213237Sgonzo struct gpioled_softc *sc; 96213237Sgonzo const char *name; 97213237Sgonzo 98213237Sgonzo sc = device_get_softc(dev); 99213237Sgonzo sc->sc_dev = dev; 100213237Sgonzo sc->sc_busdev = device_get_parent(dev); 101213237Sgonzo GPIOLED_LOCK_INIT(sc); 102213237Sgonzo if (resource_string_value(device_get_name(dev), 103213237Sgonzo device_get_unit(dev), "name", &name)) 104213237Sgonzo name = NULL; 105213237Sgonzo 106213237Sgonzo sc->sc_leddev = led_create(gpioled_control, sc, name ? name : 107213237Sgonzo device_get_nameunit(dev)); 108213237Sgonzo 109213237Sgonzo return (0); 110213237Sgonzo} 111213237Sgonzo 112213237Sgonzostatic int 113213237Sgonzogpioled_detach(device_t dev) 114213237Sgonzo{ 115213237Sgonzo struct gpioled_softc *sc; 116213237Sgonzo 117213237Sgonzo sc = device_get_softc(dev); 118213237Sgonzo if (sc->sc_leddev) { 119213237Sgonzo led_destroy(sc->sc_leddev); 120213237Sgonzo sc->sc_leddev = NULL; 121213237Sgonzo } 122213237Sgonzo GPIOLED_LOCK_DESTROY(sc); 123213237Sgonzo return (0); 124213237Sgonzo} 125213237Sgonzo 126213237Sgonzostatic devclass_t gpioled_devclass; 127213237Sgonzo 128213237Sgonzostatic device_method_t gpioled_methods[] = { 129213237Sgonzo /* Device interface */ 130213237Sgonzo DEVMETHOD(device_probe, gpioled_probe), 131213237Sgonzo DEVMETHOD(device_attach, gpioled_attach), 132213237Sgonzo DEVMETHOD(device_detach, gpioled_detach), 133213237Sgonzo 134213237Sgonzo { 0, 0 } 135213237Sgonzo}; 136213237Sgonzo 137213237Sgonzostatic driver_t gpioled_driver = { 138213237Sgonzo "gpioled", 139213237Sgonzo gpioled_methods, 140213237Sgonzo sizeof(struct gpioled_softc), 141213237Sgonzo}; 142213237Sgonzo 143213237SgonzoDRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 144