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 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 /*
  56  * This isn't defined in older kernel headers and there is no way of
  57  * detecting it.
  58  */
  59 struct _input_id {
  60     __u16 bustype;
  61     __u16 vendor;
  62     __u16 product;
  63     __u16 version;
  64 };
  65
  66 static const char* const valid_modargs[] = {
  67     "device",
  68     "sink",
  69     NULL,
  70 };
  71
  72 struct userdata {
  73     int fd, fd_type;
  74     pa_io_event *io;
  75     char *sink_name;
  76     pa_module *module;
  77 };
  78
  79 static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event_flags_t events, void*userdata) {
  80     struct userdata *u = userdata;
  81
  82     pa_assert(io);
  83     pa_assert(u);
  84
  85     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  86         pa_log("Lost connection to evdev device.");
  87         goto fail;
  88     }
  89
  90     if (events & PA_IO_EVENT_INPUT) {
  91         struct input_event ev;
  92
  93         if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
  94             pa_log("Failed to read from event device: %s", pa_cstrerror(errno));
  95             goto fail;
  96         }
  97
  98         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
  99             enum { INVALID, UP, DOWN, MUTE_TOGGLE } volchange = INVALID;
 100
 101             pa_log_debug("Key code=%u, value=%u", ev.code, ev.value);
 102
 103             switch (ev.code) {
 104                 case KEY_VOLUMEDOWN:  volchange = DOWN; break;
 105                 case KEY_VOLUMEUP:    volchange = UP; break;
 106                 case KEY_MUTE:        volchange = MUTE_TOGGLE; break;
 107             }
 108
 109             if (volchange != INVALID) {
 110                 pa_sink *s;
 111
 112                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK)))
 113                     pa_log("Failed to get sink '%s'", u->sink_name);
 114                 else {
 115                     int i;
 116                     pa_cvolume cv = *pa_sink_get_volume(s, FALSE);
 117
 118 #define DELTA (PA_VOLUME_NORM/20)
 119
 120                     switch (volchange) {
 121                         case UP:
 122                             for (i = 0; i < cv.channels; i++) {
 123                                 cv.values[i] += DELTA;
 124
 125                                 if (cv.values[i] > PA_VOLUME_NORM)
 126                                     cv.values[i] = PA_VOLUME_NORM;
 127                             }
 128
 129                             pa_sink_set_volume(s, &cv);
 130                             break;
 131
 132                         case DOWN:
 133                             for (i = 0; i < cv.channels; i++) {
 134                                 if (cv.values[i] >= DELTA)
 135                                     cv.values[i] -= DELTA;
 136                                 else
 137                                     cv.values[i] = PA_VOLUME_MUTED;
 138                             }
 139
 140                             pa_sink_set_volume(s, &cv);
 141                             break;
 142
 143                         case MUTE_TOGGLE:
 144
 145                             pa_sink_set_mute(s, !pa_sink_get_mute(s, FALSE));
 146                             break;
 147
 148                         case INVALID:
 149                             ;
 150                     }
 151                 }
 152             }
 153         }
 154     }
 155
 156     return;
 157
 158 fail:
 159     u->module->core->mainloop->io_free(u->io);
 160     u->io = NULL;
 161
 162     pa_module_unload_request(u->module, TRUE);
 163 }
 164
 165 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 166
 167 int pa__init(pa_module*m) {
 168
 169     pa_modargs *ma = NULL;
 170     struct userdata *u;
 171     int version;
 172     struct _input_id input_id;
 173     char name[256];
 174     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 175
 176     pa_assert(m);
 177
 178     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 179         pa_log("Failed to parse module arguments");
 180         goto fail;
 181     }
 182
 183     m->userdata = u = pa_xnew(struct userdata,1);
 184     u->module = m;
 185     u->io = NULL;
 186     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 187     u->fd = -1;
 188     u->fd_type = 0;
 189
 190     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY)) < 0) {
 191         pa_log("failed to open evdev device: %s", pa_cstrerror(errno));
 192         goto fail;
 193     }
 194
 195     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 196         pa_log("EVIOCGVERSION failed: %s", pa_cstrerror(errno));
 197         goto fail;
 198     }
 199
 200     pa_log_info("evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 201
 202     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 203         pa_log("EVIOCGID failed: %s", pa_cstrerror(errno));
 204         goto fail;
 205     }
 206
 207     pa_log_info("evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 208                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 209
 210     memset(name, 0, sizeof(name));
 211     if(ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 212         pa_log("EVIOCGNAME failed: %s", pa_cstrerror(errno));
 213         goto fail;
 214     }
 215
 216     pa_log_info("evdev device name: %s", name);
 217
 218     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 219     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 220         pa_log("EVIOCGBIT failed: %s", pa_cstrerror(errno));
 221         goto fail;
 222     }
 223
 224     if (!test_bit(EV_KEY, evtype_bitmask)) {
 225         pa_log("Device has no keys.");
 226         goto fail;
 227     }
 228
 229     u->io = m->core->mainloop->io_new(m->core->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 230
 231     pa_modargs_free(ma);
 232
 233     return 0;
 234
 235 fail:
 236
 237     if (ma)
 238         pa_modargs_free(ma);
 239
 240     pa__done(m);
 241     return -1;
 242 }
 243
 244 void pa__done(pa_module*m) {
 245     struct userdata *u;
 246
 247     pa_assert(m);
 248
 249     if (!(u = m->userdata))
 250         return;
 251
 252     if (u->io)
 253         m->core->mainloop->io_free(u->io);
 254
 255     if (u->fd >= 0)
 256         pa_assert_se(pa_close(u->fd) == 0);
 257
 258     pa_xfree(u->sink_name);
 259     pa_xfree(u);
 260 }