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 "opt_platform.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/gpio.h> 36 #include <sys/kernel.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/gpio/gpiobusvar.h> 43 #include <dev/led/led.h> 44 45 #include "gpiobus_if.h" 46 47 /* 48 * Only one pin for led 49 */ 50 #define GPIOLED_PIN 0 51 52 #define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 53 #define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 54 #define GPIOLED_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \ 55 device_get_nameunit((_sc)->sc_dev), "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 int sc_invert; 65 }; 66 67 static void gpioled_control(void *, int); 68 static int gpioled_probe(device_t); 69 static int gpioled_attach(device_t); 70 static int gpioled_detach(device_t); 71 72 static void 73 gpioled_control(void *priv, int onoff) 74 { 75 struct gpioled_softc *sc; 76 77 sc = (struct gpioled_softc *)priv; 78 GPIOLED_LOCK(sc); 79 if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 80 GPIO_PIN_OUTPUT) == 0) { 81 if (sc->sc_invert) 82 onoff = !onoff; 83 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 84 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 85 } 86 GPIOLED_UNLOCK(sc); 87 } 88 89 static int 90 gpioled_probe(device_t dev) 91 { 92 device_set_desc(dev, "GPIO led"); 93 94 return (BUS_PROBE_DEFAULT); 95 } 96 97 static int 98 gpioled_attach(device_t dev) 99 { 100 struct gpioled_softc *sc; 101 int state; 102 const char *name; 103 104 sc = device_get_softc(dev); 105 sc->sc_dev = dev; 106 sc->sc_busdev = device_get_parent(dev); 107 GPIOLED_LOCK_INIT(sc); 108 109 state = 0; 110 111 if (resource_string_value(device_get_name(dev), 112 device_get_unit(dev), "name", &name)) 113 name = NULL; 114 resource_int_value(device_get_name(dev), 115 device_get_unit(dev), "invert", &sc->sc_invert); 116 117 sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name : 118 device_get_nameunit(dev), state); 119 120 return (0); 121 } 122 123 static int 124 gpioled_detach(device_t dev) 125 { 126 struct gpioled_softc *sc; 127 128 sc = device_get_softc(dev); 129 if (sc->sc_leddev) { 130 led_destroy(sc->sc_leddev); 131 sc->sc_leddev = NULL; 132 } 133 GPIOLED_LOCK_DESTROY(sc); 134 return (0); 135 } 136 137 static devclass_t gpioled_devclass; 138 139 static device_method_t gpioled_methods[] = { 140 /* Device interface */ 141 DEVMETHOD(device_probe, gpioled_probe), 142 DEVMETHOD(device_attach, gpioled_attach), 143 DEVMETHOD(device_detach, gpioled_detach), 144 145 DEVMETHOD_END 146 }; 147 148 static driver_t gpioled_driver = { 149 "gpioled", 150 gpioled_methods, 151 sizeof(struct gpioled_softc), 152 }; 153 154 DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 155 MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1); 156