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, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #include <stdio.h>
25 #include <unistd.h>
26 #include <string.h>
27 #include <stdlib.h>
28 #include <errno.h>
29 #include <fcntl.h>
30
31 #include <linux/input.h>
32
33 #include <pulse/xmalloc.h>
34
35 #include <pulsecore/core-error.h>
36 #include <pulsecore/module.h>
37 #include <pulsecore/log.h>
38 #include <pulsecore/namereg.h>
39 #include <pulsecore/sink.h>
40 #include <pulsecore/modargs.h>
41 #include <pulsecore/core-util.h>
42
43 PA_MODULE_AUTHOR("Lennart Poettering");
44 PA_MODULE_DESCRIPTION("Multimedia keyboard support via Linux evdev");
45 PA_MODULE_VERSION(PACKAGE_VERSION);
46 PA_MODULE_LOAD_ONCE(false);
47 PA_MODULE_USAGE("device=<evdev device> sink=<sink name> volume_limit=<volume limit> volume_step=<volume change step>");
48
49 #define DEFAULT_DEVICE "/dev/input/event0"
50
51 static const char* const valid_modargs[] = {
52 "device",
53 "sink",
54 "volume_limit",
55 "volume_step",
56 NULL,
57 };
58
59 struct userdata {
60 int fd, fd_type;
61 pa_io_event *io;
62 char *sink_name;
63 pa_module *module;
64 pa_volume_t volume_limit;
65 pa_volume_t volume_step;
66 };
67
io_callback(pa_mainloop_api * io,pa_io_event * e,int fd,pa_io_event_flags_t events,void * userdata)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 {
89 INVALID,
90 UP,
91 DOWN,
92 MUTE_TOGGLE
93 } volchange = INVALID;
94
95 pa_log_debug("Key code=%u, value=%u", ev.code, ev.value);
96
97 switch (ev.code) {
98 case KEY_VOLUMEDOWN:
99 volchange = DOWN;
100 break;
101
102 case KEY_VOLUMEUP:
103 volchange = UP;
104 break;
105
106 case KEY_MUTE:
107 volchange = MUTE_TOGGLE;
108 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)))
115 pa_log("Failed to get sink '%s'", u->sink_name);
116 else {
117 pa_cvolume cv = *pa_sink_get_volume(s, false);
118
119 switch (volchange) {
120 case UP:
121 pa_cvolume_inc_clamp(&cv, u->volume_step, u->volume_limit);
122 pa_sink_set_volume(s, &cv, true, true);
123 break;
124
125 case DOWN:
126 pa_cvolume_dec(&cv, u->volume_step);
127 pa_sink_set_volume(s, &cv, true, true);
128 break;
129
130 case MUTE_TOGGLE:
131 pa_sink_set_mute(s, !pa_sink_get_mute(s, false), true);
132 break;
133
134 case INVALID:
135 pa_assert_not_reached();
136 }
137 }
138 }
139 }
140 }
141
142 return;
143
144 fail:
145 u->module->core->mainloop->io_free(u->io);
146 u->io = NULL;
147
148 pa_module_unload_request(u->module, true);
149 }
150
151 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
152
pa__init(pa_module * m)153 int pa__init(pa_module*m) {
154
155 pa_modargs *ma = NULL;
156 struct userdata *u;
157 int version;
158 struct input_id input_id;
159 char name[256];
160 uint8_t evtype_bitmask[EV_MAX/8 + 1];
161 pa_volume_t volume_limit = PA_VOLUME_NORM*3/2;
162 pa_volume_t volume_step = PA_VOLUME_NORM/20;
163
164 pa_assert(m);
165
166 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
167 pa_log("Failed to parse module arguments");
168 goto fail;
169 }
170
171 if (pa_modargs_get_value_u32(ma, "volume_limit", &volume_limit) < 0) {
172 pa_log("Failed to parse volume limit");
173 goto fail;
174 }
175
176 if (pa_modargs_get_value_u32(ma, "volume_step", &volume_step) < 0) {
177 pa_log("Failed to parse volume step");
178 goto fail;
179 }
180
181 m->userdata = u = pa_xnew(struct userdata, 1);
182 u->module = m;
183 u->io = NULL;
184 u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
185 u->fd = -1;
186 u->fd_type = 0;
187 u->volume_limit = PA_CLAMP_VOLUME(volume_limit);
188 u->volume_step = PA_CLAMP_VOLUME(volume_step);
189
190 if ((u->fd = pa_open_cloexec(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY, 0)) < 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
pa__done(pa_module * m)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 int r = pa_close(u->fd);
257 if (r < 0) /* https://bugs.freedesktop.org/show_bug.cgi?id=80867 */
258 pa_log("Closing fd failed: %s", pa_cstrerror(errno));
259 }
260
261 pa_xfree(u->sink_name);
262 pa_xfree(u);
263 }
264