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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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   polypaudio 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 polypaudio; 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 <assert.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <fcntl.h>
  33
  34 #include <linux/input.h>
  35
  36 #include <polyp/xmalloc.h>
  37
  38 #include <polypcore/module.h>
  39 #include <polypcore/log.h>
  40 #include <polypcore/namereg.h>
  41 #include <polypcore/sink.h>
  42 #include <polypcore/modargs.h>
  43 #include <polypcore/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_USAGE("device=<evdev device> sink=<sink name>")
  51
  52 #define DEFAULT_DEVICE "/dev/input/event0"
  53
  54 /*
  55  * This isn't defined in older kernel headers and there is no way of
  56  * detecting it.
  57  */
  58 struct _input_id {
  59     __u16 bustype;
  60     __u16 vendor;
  61     __u16 product;
  62     __u16 version;
  63 };
  64
  65 static const char* const valid_modargs[] = {
  66     "device",
  67     "sink",
  68     NULL,
  69 };
  70
  71 struct userdata {
  72     int fd;
  73     pa_io_event *io;
  74     char *sink_name;
  75     pa_module *module;
  76 };
  77
  78 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) {
  79     struct userdata *u = userdata;
  80     assert(io);
  81     assert(u);
  82
  83     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  84         pa_log(__FILE__": lost connection to evdev device.");
  85         goto fail;
  86     }
  87
  88     if (events & PA_IO_EVENT_INPUT) {
  89         struct input_event ev;
  90
  91         if (pa_loop_read(u->fd, &ev, sizeof(ev)) <= 0) {
  92             pa_log(__FILE__": failed to read from event device: %s", strerror(errno));
  93             goto fail;
  94         }
  95
  96         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
  97             enum { INVALID, UP, DOWN, MUTE_TOGGLE } volchange = INVALID;
  98
  99             pa_log_debug(__FILE__": key code=%u, value=%u", ev.code, ev.value);
 100
 101             switch (ev.code) {
 102                 case KEY_VOLUMEDOWN:  volchange = DOWN; break;
 103                 case KEY_VOLUMEUP:    volchange = UP; break;
 104                 case KEY_MUTE:        volchange = MUTE_TOGGLE; break;
 105             }
 106
 107             if (volchange != INVALID) {
 108                 pa_sink *s;
 109
 110                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK, 1)))
 111                     pa_log(__FILE__": failed to get sink '%s'", u->sink_name);
 112                 else {
 113                     int i;
 114                     pa_cvolume cv = *pa_sink_get_volume(s, PA_MIXER_HARDWARE);
 115
 116 #define DELTA (PA_VOLUME_NORM/20)
 117
 118                     switch (volchange) {
 119                         case UP:
 120                             for (i = 0; i < cv.channels; i++) {
 121                                 cv.values[i] += DELTA;
 122
 123                                 if (cv.values[i] > PA_VOLUME_NORM)
 124                                     cv.values[i] = PA_VOLUME_NORM;
 125                             }
 126
 127                             pa_sink_set_volume(s, PA_MIXER_HARDWARE, &cv);
 128                             break;
 129
 130                         case DOWN:
 131                             for (i = 0; i < cv.channels; i++) {
 132                                 if (cv.values[i] >= DELTA)
 133                                     cv.values[i] -= DELTA;
 134                                 else
 135                                     cv.values[i] = PA_VOLUME_MUTED;
 136                             }
 137
 138                             pa_sink_set_volume(s, PA_MIXER_HARDWARE, &cv);
 139                             break;
 140
 141                         case MUTE_TOGGLE:
 142
 143                             pa_sink_set_mute(s, PA_MIXER_HARDWARE, !pa_sink_get_mute(s, PA_MIXER_HARDWARE));
 144                             break;
 145
 146                         case INVALID:
 147                             ;
 148                     }
 149                 }
 150             }
 151         }
 152     }
 153
 154     return;
 155
 156 fail:
 157     u->module->core->mainloop->io_free(u->io);
 158     u->io = NULL;
 159
 160     pa_module_unload_request(u->module);
 161 }
 162
 163 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 164
 165 int pa__init(pa_core *c, pa_module*m) {
 166     pa_modargs *ma = NULL;
 167     struct userdata *u;
 168     int version;
 169     struct _input_id input_id;
 170     char name[256];
 171     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 172     assert(c && m);
 173
 174     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 175         pa_log(__FILE__": Failed to parse module arguments");
 176         goto fail;
 177     }
 178
 179     m->userdata = u = pa_xmalloc(sizeof(struct userdata));
 180     u->module = m;
 181     u->io = NULL;
 182     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 183     u->fd = -1;
 184
 185     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY)) < 0) {
 186         pa_log(__FILE__": failed to open evdev device: %s", strerror(errno));
 187         goto fail;
 188     }
 189
 190     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 191         pa_log(__FILE__": EVIOCGVERSION failed: %s", strerror(errno));
 192         goto fail;
 193     }
 194
 195     pa_log_info(__FILE__": evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 196
 197     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 198         pa_log(__FILE__": EVIOCGID failed: %s", strerror(errno));
 199         goto fail;
 200     }
 201
 202     pa_log_info(__FILE__": evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 203                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 204
 205     memset(name, 0, sizeof(name));
 206     if(ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 207         pa_log(__FILE__": EVIOCGNAME failed: %s", strerror(errno));
 208         goto fail;
 209     }
 210
 211     pa_log_info(__FILE__": evdev device name: %s", name);
 212
 213     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 214     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 215         pa_log(__FILE__": EVIOCGBIT failed: %s", strerror(errno));
 216         goto fail;
 217     }
 218
 219     if (!test_bit(EV_KEY, evtype_bitmask)) {
 220         pa_log(__FILE__": device has no keys.");
 221         goto fail;
 222     }
 223
 224     u->io = c->mainloop->io_new(c->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 225
 226     pa_modargs_free(ma);
 227
 228     return 0;
 229
 230 fail:
 231
 232     if (ma)
 233         pa_modargs_free(ma);
 234
 235     pa__done(c, m);
 236     return -1;
 237 }
 238
 239 void pa__done(pa_core *c, pa_module*m) {
 240     struct userdata *u;
 241     assert(c);
 242     assert(m);
 243
 244     if (!(u = m->userdata))
 245         return;
 246
 247     if (u->io)
 248         m->core->mainloop->io_free(u->io);
 249
 250     if (u->fd >= 0)
 251         close(u->fd);
 252
 253     pa_xfree(u->sink_name);
 254     pa_xfree(u);
 255 }