code.delx.au - pulseaudio/blob - src/modules/module-mmkbd-evdev.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2005-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #include <fcntl.h>
  32
  33 #include <linux/input.h>
  34
  35 #include <pulse/xmalloc.h>
  36
  37 #include <pulsecore/core-error.h>
  38 #include <pulsecore/module.h>
  39 #include <pulsecore/log.h>
  40 #include <pulsecore/namereg.h>
  41 #include <pulsecore/sink.h>
  42 #include <pulsecore/modargs.h>
  43 #include <pulsecore/core-util.h>
  44
  45 #include "module-mmkbd-evdev-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering");
  48 PA_MODULE_DESCRIPTION("Multimedia keyboard support via Linux evdev");
  49 PA_MODULE_VERSION(PACKAGE_VERSION);
  50 PA_MODULE_LOAD_ONCE(FALSE);
  51 PA_MODULE_USAGE("device=<evdev device> sink=<sink name>");
  52
  53 #define DEFAULT_DEVICE "/dev/input/event0"
  54
  55 static const char* const valid_modargs[] = {
  56     "device",
  57     "sink",
  58     NULL,
  59 };
  60
  61 struct userdata {
  62     int fd, fd_type;
  63     pa_io_event *io;
  64     char *sink_name;
  65     pa_module *module;
  66 };
  67
  68 #define DELTA (PA_VOLUME_NORM/20)
  69
  70 static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event_flags_t events, void*userdata) {
  71     struct userdata *u = userdata;
  72
  73     pa_assert(io);
  74     pa_assert(u);
  75
  76     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  77         pa_log("Lost connection to evdev device.");
  78         goto fail;
  79     }
  80
  81     if (events & PA_IO_EVENT_INPUT) {
  82         struct input_event ev;
  83
  84         if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
  85             pa_log("Failed to read from event device: %s", pa_cstrerror(errno));
  86             goto fail;
  87         }
  88
  89         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
  90             enum {
  91                 INVALID,
  92                 UP,
  93                 DOWN,
  94                 MUTE_TOGGLE
  95             } volchange = INVALID;
  96
  97             pa_log_debug("Key code=%u, value=%u", ev.code, ev.value);
  98
  99             switch (ev.code) {
 100                 case KEY_VOLUMEDOWN:
 101                     volchange = DOWN;
 102                     break;
 103
 104                 case KEY_VOLUMEUP:
 105                     volchange = UP;
 106                     break;
 107
 108                 case KEY_MUTE:
 109                     volchange = MUTE_TOGGLE;
 110                     break;
 111             }
 112
 113             if (volchange != INVALID) {
 114                 pa_sink *s;
 115
 116                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK)))
 117                     pa_log("Failed to get sink '%s'", u->sink_name);
 118                 else {
 119                     pa_cvolume cv = *pa_sink_get_volume(s, FALSE);
 120
 121                     switch (volchange) {
 122                         case UP:
 123                             pa_cvolume_inc(&cv, DELTA);
 124                             pa_sink_set_volume(s, &cv, TRUE, TRUE);
 125                             break;
 126
 127                         case DOWN:
 128                             pa_cvolume_dec(&cv, DELTA);
 129                             pa_sink_set_volume(s, &cv, TRUE, TRUE);
 130                             break;
 131
 132                         case MUTE_TOGGLE:
 133                             pa_sink_set_mute(s, !pa_sink_get_mute(s, FALSE), TRUE);
 134                             break;
 135
 136                         case INVALID:
 137                             pa_assert_not_reached();
 138                     }
 139                 }
 140             }
 141         }
 142     }
 143
 144     return;
 145
 146 fail:
 147     u->module->core->mainloop->io_free(u->io);
 148     u->io = NULL;
 149
 150     pa_module_unload_request(u->module, TRUE);
 151 }
 152
 153 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 154
 155 int pa__init(pa_module*m) {
 156
 157     pa_modargs *ma = NULL;
 158     struct userdata *u;
 159     int version;
 160     struct input_id input_id;
 161     char name[256];
 162     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 163
 164     pa_assert(m);
 165
 166     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 167         pa_log("Failed to parse module arguments");
 168         goto fail;
 169     }
 170
 171     m->userdata = u = pa_xnew(struct userdata, 1);
 172     u->module = m;
 173     u->io = NULL;
 174     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 175     u->fd = -1;
 176     u->fd_type = 0;
 177
 178     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY|O_NOCTTY)) < 0) {
 179         pa_log("Failed to open evdev device: %s", pa_cstrerror(errno));
 180         goto fail;
 181     }
 182
 183     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 184         pa_log("EVIOCGVERSION failed: %s", pa_cstrerror(errno));
 185         goto fail;
 186     }
 187
 188     pa_log_info("evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 189
 190     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 191         pa_log("EVIOCGID failed: %s", pa_cstrerror(errno));
 192         goto fail;
 193     }
 194
 195     pa_log_info("evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 196                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 197
 198     memset(name, 0, sizeof(name));
 199     if (ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 200         pa_log("EVIOCGNAME failed: %s", pa_cstrerror(errno));
 201         goto fail;
 202     }
 203
 204     pa_log_info("evdev device name: %s", name);
 205
 206     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 207     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 208         pa_log("EVIOCGBIT failed: %s", pa_cstrerror(errno));
 209         goto fail;
 210     }
 211
 212     if (!test_bit(EV_KEY, evtype_bitmask)) {
 213         pa_log("Device has no keys.");
 214         goto fail;
 215     }
 216
 217     u->io = m->core->mainloop->io_new(m->core->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 218
 219     pa_modargs_free(ma);
 220
 221     return 0;
 222
 223 fail:
 224
 225     if (ma)
 226         pa_modargs_free(ma);
 227
 228     pa__done(m);
 229     return -1;
 230 }
 231
 232 void pa__done(pa_module*m) {
 233     struct userdata *u;
 234
 235     pa_assert(m);
 236
 237     if (!(u = m->userdata))
 238         return;
 239
 240     if (u->io)
 241         m->core->mainloop->io_free(u->io);
 242
 243     if (u->fd >= 0)
 244         pa_assert_se(pa_close(u->fd) == 0);
 245
 246     pa_xfree(u->sink_name);
 247     pa_xfree(u);
 248 }