src/modules/module-mmkbd-evdev.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2005-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34
  35 #include <linux/input.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/log.h>
  42 #include <pulsecore/namereg.h>
  43 #include <pulsecore/sink.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/core-util.h>
  46
  47 #include "module-mmkbd-evdev-symdef.h"
  48
  49 PA_MODULE_AUTHOR("Lennart Poettering")
  50 PA_MODULE_DESCRIPTION("Multimedia keyboard support via Linux evdev")
  51 PA_MODULE_VERSION(PACKAGE_VERSION)
  52 PA_MODULE_USAGE("device=<evdev device> sink=<sink name>")
  53
  54 #define DEFAULT_DEVICE "/dev/input/event0"
  55
  56 /*
  57  * This isn't defined in older kernel headers and there is no way of
  58  * detecting it.
  59  */
  60 struct _input_id {
  61     __u16 bustype;
  62     __u16 vendor;
  63     __u16 product;
  64     __u16 version;
  65 };
  66
  67 static const char* const valid_modargs[] = {
  68     "device",
  69     "sink",
  70     NULL,
  71 };
  72
  73 struct userdata {
  74     int fd, fd_type;
  75     pa_io_event *io;
  76     char *sink_name;
  77     pa_module *module;
  78 };
  79
  80 static void io_callback(pa_mainloop_api *io, PA_GCC_UNUSED pa_io_event *e, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void*userdata) {
  81     struct userdata *u = userdata;
  82
  83     pa_assert(io);
  84     pa_assert(u);
  85
  86     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  87         pa_log("Lost connection to evdev device.");
  88         goto fail;
  89     }
  90
  91     if (events & PA_IO_EVENT_INPUT) {
  92         struct input_event ev;
  93
  94         if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
  95             pa_log("Failed to read from event device: %s", pa_cstrerror(errno));
  96             goto fail;
  97         }
  98
  99         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
 100             enum { INVALID, UP, DOWN, MUTE_TOGGLE } volchange = INVALID;
 101
 102             pa_log_debug("Key code=%u, value=%u", ev.code, ev.value);
 103
 104             switch (ev.code) {
 105                 case KEY_VOLUMEDOWN:  volchange = DOWN; break;
 106                 case KEY_VOLUMEUP:    volchange = UP; break;
 107                 case KEY_MUTE:        volchange = MUTE_TOGGLE; break;
 108             }
 109
 110             if (volchange != INVALID) {
 111                 pa_sink *s;
 112
 113                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK, 1)))
 114                     pa_log("Failed to get sink '%s'", u->sink_name);
 115                 else {
 116                     int i;
 117                     pa_cvolume cv = *pa_sink_get_volume(s);
 118
 119 #define DELTA (PA_VOLUME_NORM/20)
 120
 121                     switch (volchange) {
 122                         case UP:
 123                             for (i = 0; i < cv.channels; i++) {
 124                                 cv.values[i] += DELTA;
 125
 126                                 if (cv.values[i] > PA_VOLUME_NORM)
 127                                     cv.values[i] = PA_VOLUME_NORM;
 128                             }
 129
 130                             pa_sink_set_volume(s, &cv);
 131                             break;
 132
 133                         case DOWN:
 134                             for (i = 0; i < cv.channels; i++) {
 135                                 if (cv.values[i] >= DELTA)
 136                                     cv.values[i] -= DELTA;
 137                                 else
 138                                     cv.values[i] = PA_VOLUME_MUTED;
 139                             }
 140
 141                             pa_sink_set_volume(s, &cv);
 142                             break;
 143
 144                         case MUTE_TOGGLE:
 145
 146                             pa_sink_set_mute(s, !pa_sink_get_mute(s));
 147                             break;
 148
 149                         case INVALID:
 150                             ;
 151                     }
 152                 }
 153             }
 154         }
 155     }
 156
 157     return;
 158
 159 fail:
 160     u->module->core->mainloop->io_free(u->io);
 161     u->io = NULL;
 162
 163     pa_module_unload_request(u->module);
 164 }
 165
 166 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 167
 168 int pa__init(pa_module*m) {
 169
 170     pa_modargs *ma = NULL;
 171     struct userdata *u;
 172     int version;
 173     struct _input_id input_id;
 174     char name[256];
 175     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 176
 177     pa_assert(m);
 178
 179     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 180         pa_log("Failed to parse module arguments");
 181         goto fail;
 182     }
 183
 184     m->userdata = u = pa_xnew(struct userdata,1);
 185     u->module = m;
 186     u->io = NULL;
 187     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 188     u->fd = -1;
 189     u->fd_type = 0;
 190
 191     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY)) < 0) {
 192         pa_log("failed to open evdev device: %s", pa_cstrerror(errno));
 193         goto fail;
 194     }
 195
 196     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 197         pa_log("EVIOCGVERSION failed: %s", pa_cstrerror(errno));
 198         goto fail;
 199     }
 200
 201     pa_log_info("evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 202
 203     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 204         pa_log("EVIOCGID failed: %s", pa_cstrerror(errno));
 205         goto fail;
 206     }
 207
 208     pa_log_info("evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 209                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 210
 211     memset(name, 0, sizeof(name));
 212     if(ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 213         pa_log("EVIOCGNAME failed: %s", pa_cstrerror(errno));
 214         goto fail;
 215     }
 216
 217     pa_log_info("evdev device name: %s", name);
 218
 219     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 220     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 221         pa_log("EVIOCGBIT failed: %s", pa_cstrerror(errno));
 222         goto fail;
 223     }
 224
 225     if (!test_bit(EV_KEY, evtype_bitmask)) {
 226         pa_log("Device has no keys.");
 227         goto fail;
 228     }
 229
 230     u->io = m->core->mainloop->io_new(m->core->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 231
 232     pa_modargs_free(ma);
 233
 234     return 0;
 235
 236 fail:
 237
 238     if (ma)
 239         pa_modargs_free(ma);
 240
 241     pa__done(m);
 242     return -1;
 243 }
 244
 245 void pa__done(pa_module*m) {
 246     struct userdata *u;
 247
 248     pa_assert(m);
 249
 250     if (!(u = m->userdata))
 251         return;
 252
 253     if (u->io)
 254         m->core->mainloop->io_free(u->io);
 255
 256     if (u->fd >= 0)
 257         pa_assert_se(pa_close(u->fd) == 0);
 258
 259     pa_xfree(u->sink_name);
 260     pa_xfree(u);
 261 }