gpioled.c revision 266105
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: stable/10/sys/dev/gpio/gpioled.c 266105 2014-05-15 01:27:53Z loos $"); 29 30#include "opt_platform.h" 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/bio.h> 35#include <sys/bus.h> 36#include <sys/conf.h> 37#include <sys/kernel.h> 38#include <sys/kthread.h> 39#include <sys/lock.h> 40#include <sys/malloc.h> 41#include <sys/module.h> 42#include <sys/mutex.h> 43 44#ifdef FDT 45#include <dev/fdt/fdt_common.h> 46#include <dev/gpio/gpiobusvar.h> 47#include <dev/ofw/ofw_bus.h> 48#endif 49 50#include <dev/led/led.h> 51#include <sys/gpio.h> 52#include "gpiobus_if.h" 53 54/* 55 * Only one pin for led 56 */ 57#define GPIOLED_PIN 0 58 59#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 60#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 61#define GPIOLED_LOCK_INIT(_sc) \ 62 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 63 "gpioled", MTX_DEF) 64#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 65 66struct gpioled_softc 67{ 68 device_t sc_dev; 69 device_t sc_busdev; 70 struct mtx sc_mtx; 71 struct cdev *sc_leddev; 72}; 73 74static void gpioled_control(void *, int); 75static int gpioled_probe(device_t); 76static int gpioled_attach(device_t); 77static int gpioled_detach(device_t); 78 79static void 80gpioled_control(void *priv, int onoff) 81{ 82 struct gpioled_softc *sc = priv; 83 GPIOLED_LOCK(sc); 84 GPIOBUS_LOCK_BUS(sc->sc_busdev); 85 GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev); 86 GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 87 GPIO_PIN_OUTPUT); 88 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN, 89 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW); 90 GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev); 91 GPIOBUS_UNLOCK_BUS(sc->sc_busdev); 92 GPIOLED_UNLOCK(sc); 93} 94 95#ifdef FDT 96static void 97gpioled_identify(driver_t *driver, device_t bus) 98{ 99 phandle_t child, leds, root; 100 101 root = OF_finddevice("/"); 102 if (root == 0) 103 return; 104 leds = fdt_find_compatible(root, "gpio-leds", 1); 105 if (leds == 0) 106 return; 107 108 /* Traverse the 'gpio-leds' node and add its children. */ 109 for (child = OF_child(leds); child != 0; child = OF_peer(child)) 110 if (ofw_gpiobus_add_fdt_child(bus, child) == NULL) 111 continue; 112} 113#endif 114 115static int 116gpioled_probe(device_t dev) 117{ 118#ifdef FDT 119 int match; 120 phandle_t node; 121 char *compat; 122 123 /* 124 * We can match against our own node compatible string and also against 125 * our parent node compatible string. The first is normally used to 126 * describe leds on a gpiobus and the later when there is a common node 127 * compatible with 'gpio-leds' which is used to concentrate all the 128 * leds nodes on the dts. 129 */ 130 match = 0; 131 if (ofw_bus_is_compatible(dev, "gpioled")) 132 match = 1; 133 134 if (match == 0) { 135 if ((node = ofw_bus_get_node(dev)) == -1) 136 return (ENXIO); 137 if ((node = OF_parent(node)) == -1) 138 return (ENXIO); 139 if (OF_getprop_alloc(node, "compatible", 1, 140 (void **)&compat) == -1) 141 return (ENXIO); 142 143 if (strcasecmp(compat, "gpio-leds") == 0) 144 match = 1; 145 146 free(compat, M_OFWPROP); 147 } 148 149 if (match == 0) 150 return (ENXIO); 151#endif 152 device_set_desc(dev, "GPIO led"); 153 154 return (0); 155} 156 157static int 158gpioled_attach(device_t dev) 159{ 160 struct gpioled_softc *sc; 161#ifdef FDT 162 phandle_t node; 163 char *name; 164#else 165 const char *name; 166#endif 167 168 sc = device_get_softc(dev); 169 sc->sc_dev = dev; 170 sc->sc_busdev = device_get_parent(dev); 171 GPIOLED_LOCK_INIT(sc); 172#ifdef FDT 173 name = NULL; 174 if ((node = ofw_bus_get_node(dev)) == -1) 175 return (ENXIO); 176 if (OF_getprop_alloc(node, "label", 1, (void **)&name) == -1) 177 OF_getprop_alloc(node, "name", 1, (void **)&name); 178#else 179 if (resource_string_value(device_get_name(dev), 180 device_get_unit(dev), "name", &name)) 181 name = NULL; 182#endif 183 184 sc->sc_leddev = led_create(gpioled_control, sc, name ? name : 185 device_get_nameunit(dev)); 186#ifdef FDT 187 if (name != NULL) 188 free(name, M_OFWPROP); 189#endif 190 191 return (0); 192} 193 194static int 195gpioled_detach(device_t dev) 196{ 197 struct gpioled_softc *sc; 198 199 sc = device_get_softc(dev); 200 if (sc->sc_leddev) { 201 led_destroy(sc->sc_leddev); 202 sc->sc_leddev = NULL; 203 } 204 GPIOLED_LOCK_DESTROY(sc); 205 return (0); 206} 207 208static devclass_t gpioled_devclass; 209 210static device_method_t gpioled_methods[] = { 211 /* Device interface */ 212#ifdef FDT 213 DEVMETHOD(device_identify, gpioled_identify), 214#endif 215 DEVMETHOD(device_probe, gpioled_probe), 216 DEVMETHOD(device_attach, gpioled_attach), 217 DEVMETHOD(device_detach, gpioled_detach), 218 219 { 0, 0 } 220}; 221 222static driver_t gpioled_driver = { 223 "gpioled", 224 gpioled_methods, 225 sizeof(struct gpioled_softc), 226}; 227 228DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0); 229