sys/dev/misc/gpio/gpio_led.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Alex Hornung <ahornung@gmail.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  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
  16  *    distribution.
  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.
  20  *
  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
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/conf.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>
  42 #include <sys/sbuf.h>
  43 #include <sys/queue.h>
  44 #include <dev/misc/gpio/gpio.h>
  45 #include <sys/uio.h>
  46 #include <sys/lock.h>
  47 #include <sys/devfs.h>
  48
  49 struct ledsc {
  50         LIST_ENTRY(ledsc)       list;
  51         struct gpio *gp;
  52         int             pin;
  53         cdev_t  dev;
  54         int             unit;
  55         int             opened;
  56         char    *name;
  57         struct gpio_mapping *gp_map;
  58 };
  59
  60 DEVFS_DECLARE_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");
  64
  65
  66 static int
  67 led_open(struct dev_open_args *ap)
  68 {
  69         struct ledsc *sc;
  70         cdev_t  dev;
  71
  72         dev = ap->a_head.a_dev;
  73         sc = dev->si_drv1;
  74
  75         if (sc->opened)
  76                 return EBUSY;
  77
  78         sc->opened = 1;
  79
  80         return 0;
  81 }
  82
  83 static int
  84 led_close(struct dev_close_args *ap)
  85 {
  86         struct ledsc *sc;
  87         cdev_t  dev;
  88
  89         dev = ap->a_head.a_dev;
  90         sc = dev->si_drv1;
  91
  92         if (sc->opened)
  93                 sc->opened = 0;
  94
  95         return 0;
  96 }
  97
  98 static int
  99 led_write(struct dev_write_args *ap)
 100 {
 101         struct ledsc *sc;
 102         cdev_t  dev;
 103         int             error;
 104         int             data = 0;
 105         int             len;
 106
 107         dev = ap->a_head.a_dev;
 108         sc = dev->si_drv1;
 109
 110         if (ap->a_uio->uio_resid > sizeof(int))
 111                 return EINVAL;
 112
 113         len = ap->a_uio->uio_resid;
 114
 115         error = uiomove((void *)&data, ap->a_uio->uio_resid, ap->a_uio);
 116         if (error)
 117                 return error;
 118
 119         if (len > 1)
 120                 data = ((char *)&data)[0];
 121
 122         if (data >= '0')
 123                 data -= '0';
 124
 125         gpio_pin_write(sc->gp, sc->gp_map, 0, data);
 126
 127         return 0;
 128 }
 129
 130 static int
 131 led_read(struct dev_read_args *ap)
 132 {
 133         struct ledsc *sc;
 134         cdev_t  dev;
 135         int             error;
 136         int             data = 0;
 137
 138         dev = ap->a_head.a_dev;
 139         sc = dev->si_drv1;
 140
 141         if (ap->a_uio->uio_resid < sizeof(int))
 142                 return EINVAL;
 143
 144         data = gpio_pin_read(sc->gp, sc->gp_map, 0);
 145
 146         error = uiomove((void *)&data,
 147             (ap->a_uio->uio_resid > sizeof(int))?(sizeof(int)):(ap->a_uio->uio_resid),
 148                 ap->a_uio);
 149
 150         return error;
 151 }
 152
 153 static int
 154 led_ioctl(struct dev_ioctl_args *ap)
 155 {
 156         /* XXX: set a name */
 157         return 0;
 158 }
 159
 160 static struct dev_ops nled_ops = {
 161         { "gpio", 0, 0 },
 162         .d_open  =      led_open,
 163         .d_close =      led_close,
 164         .d_write =      led_write,
 165         .d_read  =      led_read,
 166         .d_ioctl =      led_ioctl,
 167 };
 168
 169
 170 static int
 171 led_attach(struct gpio *gp, void *arg, int pin, u_int32_t mask)
 172 {
 173         struct ledsc *sc;
 174
 175         if (arg == NULL)
 176                 return 1;
 177
 178         lockmgr(&led_lock, LK_EXCLUSIVE);
 179         sc = kmalloc(sizeof(struct ledsc), M_LED, M_WAITOK);
 180
 181         /* XXX: check for name collisions */
 182         sc->name = kstrdup((char *)arg, M_LED);
 183         sc->pin = pin;
 184         sc->gp = gp;
 185
 186         sc->gp_map = gpio_map(gp, NULL, pin, 1);
 187         if (sc->gp_map == NULL) {
 188                 return 2;
 189         }
 190
 191         sc->unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(nled), 0);
 192
 193         LIST_INSERT_HEAD(&led_list, sc, list);
 194         sc->dev = make_dev(&nled_ops, sc->unit,
 195             UID_ROOT, GID_WHEEL, 0600, "led/%s", sc->name);
 196         sc->dev->si_drv1 = sc;
 197         lockmgr(&led_lock, LK_RELEASE);
 198
 199         kprintf("gpio_led: Attached led '%s' to gpio %s, pin %d\n",
 200             sc->name, sc->gp->driver_name, pin);
 201
 202         return 0;
 203 }
 204
 205 static void
 206 led_detach(struct gpio *gp, void *arg, int pin)
 207 {
 208         /* XXX: implement */
 209 }
 210
 211 void
 212 led_switch(const char *name, int on_off)
 213 {
 214         struct ledsc *sc;
 215
 216         if (name == NULL)
 217                 return;
 218
 219         lockmgr(&led_lock, LK_EXCLUSIVE);
 220         LIST_FOREACH(sc, &led_list, list) {
 221                 if (strcmp(name, sc->name) != 0)
 222                         continue;
 223
 224                 gpio_pin_write(sc->gp, sc->gp_map, 0, on_off);
 225                 break;
 226         }
 227
 228         lockmgr(&led_lock, LK_RELEASE);
 229 }
 230
 231 struct gpio_consumer led_gpio_cons = {
 232         .consumer_name = "led",
 233         .consumer_attach = led_attach,
 234         .consumer_detach = led_detach,
 235 };
 236
 237 static void
 238 led_drvinit(void *unused)
 239 {
 240         lockinit(&led_lock, "led_lock", 0, 0);
 241         devfs_clone_bitmap_init(&DEVFS_CLONE_BITMAP(nled));
 242         gpio_consumer_register(&led_gpio_cons);
 243 }
 244
 245 SYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL);