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 static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event_flags_t events, void*userdata) {
  69     struct userdata *u = userdata;
  70
  71     pa_assert(io);
  72     pa_assert(u);
  73
  74     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  75         pa_log("Lost connection to evdev device.");
  76         goto fail;
  77     }
  78
  79     if (events & PA_IO_EVENT_INPUT) {
  80         struct input_event ev;
  81
  82         if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
  83             pa_log("Failed to read from event device: %s", pa_cstrerror(errno));
  84             goto fail;
  85         }
  86
  87         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
  88             enum { INVALID, UP, DOWN, MUTE_TOGGLE } volchange = INVALID;
  89
  90             pa_log_debug("Key code=%u, value=%u", ev.code, ev.value);
  91
  92             switch (ev.code) {
  93                 case KEY_VOLUMEDOWN:  volchange = DOWN; break;
  94                 case KEY_VOLUMEUP:    volchange = UP; break;
  95                 case KEY_MUTE:        volchange = MUTE_TOGGLE; break;
  96             }
  97
  98             if (volchange != INVALID) {
  99                 pa_sink *s;
 100
 101                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK)))
 102                     pa_log("Failed to get sink '%s'", u->sink_name);
 103                 else {
 104                     int i;
 105                     pa_cvolume cv = *pa_sink_get_volume(s, FALSE, FALSE);
 106
 107 #define DELTA (PA_VOLUME_NORM/20)
 108
 109                     switch (volchange) {
 110                         case UP:
 111                             for (i = 0; i < cv.channels; i++) {
 112                                 if (cv.values[i] < PA_VOLUME_MAX - DELTA)
 113                                     cv.values[i] += DELTA;
 114                                 else
 115                                     cv.values[i] = PA_VOLUME_MAX;
 116                             }
 117
 118                             pa_sink_set_volume(s, &cv, TRUE, TRUE, TRUE, TRUE);
 119                             break;
 120
 121                         case DOWN:
 122                             for (i = 0; i < cv.channels; i++) {
 123                                 if (cv.values[i] > DELTA)
 124                                     cv.values[i] -= DELTA;
 125                                 else
 126                                     cv.values[i] = PA_VOLUME_MUTED;
 127                             }
 128
 129                             pa_sink_set_volume(s, &cv, TRUE, TRUE, TRUE, TRUE);
 130                             break;
 131
 132                         case MUTE_TOGGLE:
 133
 134                             pa_sink_set_mute(s, !pa_sink_get_mute(s, FALSE), TRUE);
 135                             break;
 136
 137                         case INVALID:
 138                             pa_assert_not_reached();
 139                     }
 140                 }
 141             }
 142         }
 143     }
 144
 145     return;
 146
 147 fail:
 148     u->module->core->mainloop->io_free(u->io);
 149     u->io = NULL;
 150
 151     pa_module_unload_request(u->module, TRUE);
 152 }
 153
 154 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 155
 156 int pa__init(pa_module*m) {
 157
 158     pa_modargs *ma = NULL;
 159     struct userdata *u;
 160     int version;
 161     struct input_id input_id;
 162     char name[256];
 163     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 164
 165     pa_assert(m);
 166
 167     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 168         pa_log("Failed to parse module arguments");
 169         goto fail;
 170     }
 171
 172     m->userdata = u = pa_xnew(struct userdata, 1);
 173     u->module = m;
 174     u->io = NULL;
 175     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 176     u->fd = -1;
 177     u->fd_type = 0;
 178
 179     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY|O_NOCTTY)) < 0) {
 180         pa_log("Failed to open evdev device: %s", pa_cstrerror(errno));
 181         goto fail;
 182     }
 183
 184     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 185         pa_log("EVIOCGVERSION failed: %s", pa_cstrerror(errno));
 186         goto fail;
 187     }
 188
 189     pa_log_info("evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 190
 191     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 192         pa_log("EVIOCGID failed: %s", pa_cstrerror(errno));
 193         goto fail;
 194     }
 195
 196     pa_log_info("evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 197                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 198
 199     memset(name, 0, sizeof(name));
 200     if (ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 201         pa_log("EVIOCGNAME failed: %s", pa_cstrerror(errno));
 202         goto fail;
 203     }
 204
 205     pa_log_info("evdev device name: %s", name);
 206
 207     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 208     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 209         pa_log("EVIOCGBIT failed: %s", pa_cstrerror(errno));
 210         goto fail;
 211     }
 212
 213     if (!test_bit(EV_KEY, evtype_bitmask)) {
 214         pa_log("Device has no keys.");
 215         goto fail;
 216     }
 217
 218     u->io = m->core->mainloop->io_new(m->core->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 219
 220     pa_modargs_free(ma);
 221
 222     return 0;
 223
 224 fail:
 225
 226     if (ma)
 227         pa_modargs_free(ma);
 228
 229     pa__done(m);
 230     return -1;
 231 }
 232
 233 void pa__done(pa_module*m) {
 234     struct userdata *u;
 235
 236     pa_assert(m);
 237
 238     if (!(u = m->userdata))
 239         return;
 240
 241     if (u->io)
 242         m->core->mainloop->io_free(u->io);
 243
 244     if (u->fd >= 0)
 245         pa_assert_se(pa_close(u->fd) == 0);
 246
 247     pa_xfree(u->sink_name);
 248     pa_xfree(u);
 249 }