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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 <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 <pulse/xmalloc.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/module.h>
  40 #include <pulsecore/log.h>
  41 #include <pulsecore/namereg.h>
  42 #include <pulsecore/sink.h>
  43 #include <pulsecore/modargs.h>
  44 #include <pulsecore/core-util.h>
  45
  46 #include "module-mmkbd-evdev-symdef.h"
  47
  48 PA_MODULE_AUTHOR("Lennart Poettering")
  49 PA_MODULE_DESCRIPTION("Multimedia keyboard support via Linux evdev")
  50 PA_MODULE_VERSION(PACKAGE_VERSION)
  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_GCC_UNUSED pa_io_event *e, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void*userdata) {
  80     struct userdata *u = userdata;
  81     assert(io);
  82     assert(u);
  83
  84     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  85         pa_log(__FILE__": lost connection to evdev device.");
  86         goto fail;
  87     }
  88
  89     if (events & PA_IO_EVENT_INPUT) {
  90         struct input_event ev;
  91
  92         if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
  93             pa_log(__FILE__": failed to read from event device: %s", pa_cstrerror(errno));
  94             goto fail;
  95         }
  96
  97         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
  98             enum { INVALID, UP, DOWN, MUTE_TOGGLE } volchange = INVALID;
  99
 100             pa_log_debug(__FILE__": key code=%u, value=%u", ev.code, ev.value);
 101
 102             switch (ev.code) {
 103                 case KEY_VOLUMEDOWN:  volchange = DOWN; break;
 104                 case KEY_VOLUMEUP:    volchange = UP; break;
 105                 case KEY_MUTE:        volchange = MUTE_TOGGLE; break;
 106             }
 107
 108             if (volchange != INVALID) {
 109                 pa_sink *s;
 110
 111                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK, 1)))
 112                     pa_log(__FILE__": failed to get sink '%s'", u->sink_name);
 113                 else {
 114                     int i;
 115                     pa_cvolume cv = *pa_sink_get_volume(s, PA_MIXER_HARDWARE);
 116
 117 #define DELTA (PA_VOLUME_NORM/20)
 118
 119                     switch (volchange) {
 120                         case UP:
 121                             for (i = 0; i < cv.channels; i++) {
 122                                 cv.values[i] += DELTA;
 123
 124                                 if (cv.values[i] > PA_VOLUME_NORM)
 125                                     cv.values[i] = PA_VOLUME_NORM;
 126                             }
 127
 128                             pa_sink_set_volume(s, PA_MIXER_HARDWARE, &cv);
 129                             break;
 130
 131                         case DOWN:
 132                             for (i = 0; i < cv.channels; i++) {
 133                                 if (cv.values[i] >= DELTA)
 134                                     cv.values[i] -= DELTA;
 135                                 else
 136                                     cv.values[i] = PA_VOLUME_MUTED;
 137                             }
 138
 139                             pa_sink_set_volume(s, PA_MIXER_HARDWARE, &cv);
 140                             break;
 141
 142                         case MUTE_TOGGLE:
 143
 144                             pa_sink_set_mute(s, PA_MIXER_HARDWARE, !pa_sink_get_mute(s, PA_MIXER_HARDWARE));
 145                             break;
 146
 147                         case INVALID:
 148                             ;
 149                     }
 150                 }
 151             }
 152         }
 153     }
 154
 155     return;
 156
 157 fail:
 158     u->module->core->mainloop->io_free(u->io);
 159     u->io = NULL;
 160
 161     pa_module_unload_request(u->module);
 162 }
 163
 164 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 165
 166 int pa__init(pa_core *c, pa_module*m) {
 167     pa_modargs *ma = NULL;
 168     struct userdata *u;
 169     int version;
 170     struct _input_id input_id;
 171     char name[256];
 172     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 173     assert(c && m);
 174
 175     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 176         pa_log(__FILE__": Failed to parse module arguments");
 177         goto fail;
 178     }
 179
 180     m->userdata = u = pa_xmalloc(sizeof(struct userdata));
 181     u->module = m;
 182     u->io = NULL;
 183     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 184     u->fd = -1;
 185     u->fd_type = 0;
 186
 187     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY)) < 0) {
 188         pa_log(__FILE__": failed to open evdev device: %s", pa_cstrerror(errno));
 189         goto fail;
 190     }
 191
 192     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 193         pa_log(__FILE__": EVIOCGVERSION failed: %s", pa_cstrerror(errno));
 194         goto fail;
 195     }
 196
 197     pa_log_info(__FILE__": evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 198
 199     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 200         pa_log(__FILE__": EVIOCGID failed: %s", pa_cstrerror(errno));
 201         goto fail;
 202     }
 203
 204     pa_log_info(__FILE__": evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 205                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 206
 207     memset(name, 0, sizeof(name));
 208     if(ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 209         pa_log(__FILE__": EVIOCGNAME failed: %s", pa_cstrerror(errno));
 210         goto fail;
 211     }
 212
 213     pa_log_info(__FILE__": evdev device name: %s", name);
 214
 215     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 216     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 217         pa_log(__FILE__": EVIOCGBIT failed: %s", pa_cstrerror(errno));
 218         goto fail;
 219     }
 220
 221     if (!test_bit(EV_KEY, evtype_bitmask)) {
 222         pa_log(__FILE__": device has no keys.");
 223         goto fail;
 224     }
 225
 226     u->io = c->mainloop->io_new(c->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 227
 228     pa_modargs_free(ma);
 229
 230     return 0;
 231
 232 fail:
 233
 234     if (ma)
 235         pa_modargs_free(ma);
 236
 237     pa__done(c, m);
 238     return -1;
 239 }
 240
 241 void pa__done(pa_core *c, pa_module*m) {
 242     struct userdata *u;
 243     assert(c);
 244     assert(m);
 245
 246     if (!(u = m->userdata))
 247         return;
 248
 249     if (u->io)
 250         m->core->mainloop->io_free(u->io);
 251
 252     if (u->fd >= 0)
 253         close(u->fd);
 254
 255     pa_xfree(u->sink_name);
 256     pa_xfree(u);
 257 }