2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
39 #include <sys/limits.h>
40 #include <sys/malloc.h>
41 #include <sys/ctype.h>
43 #include <sys/queue.h>
44 #include <dev/misc/gpio/gpio.h>
47 #include <sys/devfs.h>
50 LIST_ENTRY(ledsc) list;
57 struct gpio_mapping *gp_map;
60 DEVFS_DEFINE_CLONE_BITMAP(nled);
61 static struct lock led_lock;
62 static LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(&led_list);
63 static MALLOC_DEFINE(M_LED, "LED", "LED driver");
67 led_open(struct dev_open_args *ap)
72 dev = ap->a_head.a_dev;
75 lockmgr(&led_lock, LK_EXCLUSIVE);
77 lockmgr(&led_lock, LK_RELEASE);
81 lockmgr(&led_lock, LK_RELEASE);
87 led_close(struct dev_close_args *ap)
92 dev = ap->a_head.a_dev;
95 lockmgr(&led_lock, LK_EXCLUSIVE);
98 lockmgr(&led_lock, LK_RELEASE);
104 led_write(struct dev_write_args *ap)
112 dev = ap->a_head.a_dev;
115 if (ap->a_uio->uio_resid > sizeof(int))
118 len = ap->a_uio->uio_resid;
120 error = uiomove((void *)&data, ap->a_uio->uio_resid, ap->a_uio);
125 data = ((char *)&data)[0];
130 lockmgr(&led_lock, LK_EXCLUSIVE);
131 gpio_pin_write(sc->gp, sc->gp_map, 0, data);
132 lockmgr(&led_lock, LK_RELEASE);
138 led_read(struct dev_read_args *ap)
145 dev = ap->a_head.a_dev;
148 if (ap->a_uio->uio_resid < sizeof(int))
151 lockmgr(&led_lock, LK_EXCLUSIVE);
152 data = gpio_pin_read(sc->gp, sc->gp_map, 0);
153 lockmgr(&led_lock, LK_RELEASE);
155 error = uiomove((void *)&data,
156 (ap->a_uio->uio_resid > sizeof(int))?(sizeof(int)):(ap->a_uio->uio_resid),
163 led_ioctl(struct dev_ioctl_args *ap)
165 /* XXX: set a name */
166 lockmgr(&led_lock, LK_EXCLUSIVE);
167 lockmgr(&led_lock, LK_RELEASE);
171 static struct dev_ops nled_ops = {
172 { "gpio", 0, D_MPSAFE },
174 .d_close = led_close,
175 .d_write = led_write,
177 .d_ioctl = led_ioctl,
182 led_attach(struct gpio *gp, void *arg, int pin, u_int32_t mask)
189 lockmgr(&led_lock, LK_EXCLUSIVE);
190 sc = kmalloc(sizeof(struct ledsc), M_LED, M_WAITOK);
192 /* XXX: check for name collisions */
193 sc->name = kstrdup((char *)arg, M_LED);
197 sc->gp_map = gpio_map(gp, NULL, pin, 1);
198 if (sc->gp_map == NULL) {
199 lockmgr(&led_lock, LK_RELEASE);
203 sc->unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(nled), 0);
205 LIST_INSERT_HEAD(&led_list, sc, list);
206 sc->dev = make_dev(&nled_ops, sc->unit,
207 UID_ROOT, GID_WHEEL, 0600, "led/%s", sc->name);
208 sc->dev->si_drv1 = sc;
209 lockmgr(&led_lock, LK_RELEASE);
211 kprintf("gpio_led: Attached led '%s' to gpio %s, pin %d\n",
212 sc->name, sc->gp->driver_name, pin);
218 led_detach(struct gpio *gp, void *arg, int pin)
225 led_switch(const char *name, int on_off)
232 lockmgr(&led_lock, LK_EXCLUSIVE);
233 LIST_FOREACH(sc, &led_list, list) {
234 if (strcmp(name, sc->name) != 0)
237 gpio_pin_write(sc->gp, sc->gp_map, 0, on_off);
241 lockmgr(&led_lock, LK_RELEASE);
244 struct gpio_consumer led_gpio_cons = {
245 .consumer_name = "led",
246 .consumer_attach = led_attach,
247 .consumer_detach = led_detach,
251 led_drvinit(void *unused)
253 lockinit(&led_lock, "led_lock", 0, 0);
254 devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(nled));
255 gpio_consumer_register(&led_gpio_cons);
258 SYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL);