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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2005-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34
  35 #include <linux/input.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/log.h>
  42 #include <pulsecore/namereg.h>
  43 #include <pulsecore/sink.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/core-util.h>
  46
  47 #include "module-mmkbd-evdev-symdef.h"
  48
  49 PA_MODULE_AUTHOR("Lennart Poettering");
  50 PA_MODULE_DESCRIPTION("Multimedia keyboard support via Linux evdev");
  51 PA_MODULE_VERSION(PACKAGE_VERSION);
  52 PA_MODULE_LOAD_ONCE(FALSE);
  53 PA_MODULE_USAGE("device=<evdev device> sink=<sink name>");
  54
  55 #define DEFAULT_DEVICE "/dev/input/event0"
  56
  57 /*
  58  * This isn't defined in older kernel headers and there is no way of
  59  * detecting it.
  60  */
  61 struct _input_id {
  62     __u16 bustype;
  63     __u16 vendor;
  64     __u16 product;
  65     __u16 version;
  66 };
  67
  68 static const char* const valid_modargs[] = {
  69     "device",
  70     "sink",
  71     NULL,
  72 };
  73
  74 struct userdata {
  75     int fd, fd_type;
  76     pa_io_event *io;
  77     char *sink_name;
  78     pa_module *module;
  79 };
  80
  81 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) {
  82     struct userdata *u = userdata;
  83
  84     pa_assert(io);
  85     pa_assert(u);
  86
  87     if (events & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) {
  88         pa_log("Lost connection to evdev device.");
  89         goto fail;
  90     }
  91
  92     if (events & PA_IO_EVENT_INPUT) {
  93         struct input_event ev;
  94
  95         if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
  96             pa_log("Failed to read from event device: %s", pa_cstrerror(errno));
  97             goto fail;
  98         }
  99
 100         if (ev.type == EV_KEY && (ev.value == 1 || ev.value == 2)) {
 101             enum { INVALID, UP, DOWN, MUTE_TOGGLE } volchange = INVALID;
 102
 103             pa_log_debug("Key code=%u, value=%u", ev.code, ev.value);
 104
 105             switch (ev.code) {
 106                 case KEY_VOLUMEDOWN:  volchange = DOWN; break;
 107                 case KEY_VOLUMEUP:    volchange = UP; break;
 108                 case KEY_MUTE:        volchange = MUTE_TOGGLE; break;
 109             }
 110
 111             if (volchange != INVALID) {
 112                 pa_sink *s;
 113
 114                 if (!(s = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK, 1)))
 115                     pa_log("Failed to get sink '%s'", u->sink_name);
 116                 else {
 117                     int i;
 118                     pa_cvolume cv = *pa_sink_get_volume(s);
 119
 120 #define DELTA (PA_VOLUME_NORM/20)
 121
 122                     switch (volchange) {
 123                         case UP:
 124                             for (i = 0; i < cv.channels; i++) {
 125                                 cv.values[i] += DELTA;
 126
 127                                 if (cv.values[i] > PA_VOLUME_NORM)
 128                                     cv.values[i] = PA_VOLUME_NORM;
 129                             }
 130
 131                             pa_sink_set_volume(s, &cv);
 132                             break;
 133
 134                         case DOWN:
 135                             for (i = 0; i < cv.channels; i++) {
 136                                 if (cv.values[i] >= DELTA)
 137                                     cv.values[i] -= DELTA;
 138                                 else
 139                                     cv.values[i] = PA_VOLUME_MUTED;
 140                             }
 141
 142                             pa_sink_set_volume(s, &cv);
 143                             break;
 144
 145                         case MUTE_TOGGLE:
 146
 147                             pa_sink_set_mute(s, !pa_sink_get_mute(s));
 148                             break;
 149
 150                         case INVALID:
 151                             ;
 152                     }
 153                 }
 154             }
 155         }
 156     }
 157
 158     return;
 159
 160 fail:
 161     u->module->core->mainloop->io_free(u->io);
 162     u->io = NULL;
 163
 164     pa_module_unload_request(u->module);
 165 }
 166
 167 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
 168
 169 int pa__init(pa_module*m) {
 170
 171     pa_modargs *ma = NULL;
 172     struct userdata *u;
 173     int version;
 174     struct _input_id input_id;
 175     char name[256];
 176     uint8_t evtype_bitmask[EV_MAX/8 + 1];
 177
 178     pa_assert(m);
 179
 180     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 181         pa_log("Failed to parse module arguments");
 182         goto fail;
 183     }
 184
 185     m->userdata = u = pa_xnew(struct userdata,1);
 186     u->module = m;
 187     u->io = NULL;
 188     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 189     u->fd = -1;
 190     u->fd_type = 0;
 191
 192     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY)) < 0) {
 193         pa_log("failed to open evdev device: %s", pa_cstrerror(errno));
 194         goto fail;
 195     }
 196
 197     if (ioctl(u->fd, EVIOCGVERSION, &version) < 0) {
 198         pa_log("EVIOCGVERSION failed: %s", pa_cstrerror(errno));
 199         goto fail;
 200     }
 201
 202     pa_log_info("evdev driver version %i.%i.%i", version >> 16, (version >> 8) & 0xff, version & 0xff);
 203
 204     if(ioctl(u->fd, EVIOCGID, &input_id)) {
 205         pa_log("EVIOCGID failed: %s", pa_cstrerror(errno));
 206         goto fail;
 207     }
 208
 209     pa_log_info("evdev vendor 0x%04hx product 0x%04hx version 0x%04hx bustype %u",
 210                 input_id.vendor, input_id.product, input_id.version, input_id.bustype);
 211
 212     memset(name, 0, sizeof(name));
 213     if(ioctl(u->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 214         pa_log("EVIOCGNAME failed: %s", pa_cstrerror(errno));
 215         goto fail;
 216     }
 217
 218     pa_log_info("evdev device name: %s", name);
 219
 220     memset(evtype_bitmask, 0, sizeof(evtype_bitmask));
 221     if (ioctl(u->fd, EVIOCGBIT(0, EV_MAX), evtype_bitmask) < 0) {
 222         pa_log("EVIOCGBIT failed: %s", pa_cstrerror(errno));
 223         goto fail;
 224     }
 225
 226     if (!test_bit(EV_KEY, evtype_bitmask)) {
 227         pa_log("Device has no keys.");
 228         goto fail;
 229     }
 230
 231     u->io = m->core->mainloop->io_new(m->core->mainloop, u->fd, PA_IO_EVENT_INPUT|PA_IO_EVENT_HANGUP, io_callback, u);
 232
 233     pa_modargs_free(ma);
 234
 235     return 0;
 236
 237 fail:
 238
 239     if (ma)
 240         pa_modargs_free(ma);
 241
 242     pa__done(m);
 243     return -1;
 244 }
 245
 246 void pa__done(pa_module*m) {
 247     struct userdata *u;
 248
 249     pa_assert(m);
 250
 251     if (!(u = m->userdata))
 252         return;
 253
 254     if (u->io)
 255         m->core->mainloop->io_free(u->io);
 256
 257     if (u->fd >= 0)
 258         pa_assert_se(pa_close(u->fd) == 0);
 259
 260     pa_xfree(u->sink_name);
 261     pa_xfree(u);
 262 }