Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Virtual Raw MIDI client on Sequencer |
| 3 | * |
| 4 | * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>, |
| 5 | * Jaroslav Kysela <perex@perex.cz> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * Virtual Raw MIDI client |
| 25 | * |
| 26 | * The virtual rawmidi client is a sequencer client which associate |
| 27 | * a rawmidi device file. The created rawmidi device file can be |
| 28 | * accessed as a normal raw midi, but its MIDI source and destination |
| 29 | * are arbitrary. For example, a user-client software synth connected |
| 30 | * to this port can be used as a normal midi device as well. |
| 31 | * |
| 32 | * The virtual rawmidi device accepts also multiple opens. Each file |
| 33 | * has its own input buffer, so that no conflict would occur. The drain |
| 34 | * of input/output buffer acts only to the local buffer. |
| 35 | * |
| 36 | */ |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/init.h> |
| 39 | #include <linux/wait.h> |
Paul Gortmaker | da155d5 | 2011-07-15 12:38:28 -0400 | [diff] [blame] | 40 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/slab.h> |
| 42 | #include <sound/core.h> |
| 43 | #include <sound/rawmidi.h> |
| 44 | #include <sound/info.h> |
| 45 | #include <sound/control.h> |
| 46 | #include <sound/minors.h> |
| 47 | #include <sound/seq_kernel.h> |
| 48 | #include <sound/seq_midi_event.h> |
| 49 | #include <sound/seq_virmidi.h> |
| 50 | |
| 51 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); |
| 52 | MODULE_DESCRIPTION("Virtual Raw MIDI client on Sequencer"); |
| 53 | MODULE_LICENSE("GPL"); |
| 54 | |
| 55 | /* |
| 56 | * initialize an event record |
| 57 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 58 | static void snd_virmidi_init_event(struct snd_virmidi *vmidi, |
| 59 | struct snd_seq_event *ev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
| 61 | memset(ev, 0, sizeof(*ev)); |
| 62 | ev->source.port = vmidi->port; |
| 63 | switch (vmidi->seq_mode) { |
| 64 | case SNDRV_VIRMIDI_SEQ_DISPATCH: |
| 65 | ev->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; |
| 66 | break; |
| 67 | case SNDRV_VIRMIDI_SEQ_ATTACH: |
| 68 | /* FIXME: source and destination are same - not good.. */ |
| 69 | ev->dest.client = vmidi->client; |
| 70 | ev->dest.port = vmidi->port; |
| 71 | break; |
| 72 | } |
| 73 | ev->type = SNDRV_SEQ_EVENT_NONE; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * decode input event and put to read buffer of each opened file |
| 78 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 79 | static int snd_virmidi_dev_receive_event(struct snd_virmidi_dev *rdev, |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 80 | struct snd_seq_event *ev, |
| 81 | bool atomic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 83 | struct snd_virmidi *vmidi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | unsigned char msg[4]; |
| 85 | int len; |
| 86 | |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 87 | if (atomic) |
| 88 | read_lock(&rdev->filelist_lock); |
| 89 | else |
| 90 | down_read(&rdev->filelist_sem); |
Johannes Berg | 9244b2c | 2006-10-05 16:02:22 +0200 | [diff] [blame] | 91 | list_for_each_entry(vmidi, &rdev->filelist, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | if (!vmidi->trigger) |
| 93 | continue; |
| 94 | if (ev->type == SNDRV_SEQ_EVENT_SYSEX) { |
| 95 | if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) |
| 96 | continue; |
| 97 | snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)snd_rawmidi_receive, vmidi->substream); |
| 98 | } else { |
| 99 | len = snd_midi_event_decode(vmidi->parser, msg, sizeof(msg), ev); |
| 100 | if (len > 0) |
| 101 | snd_rawmidi_receive(vmidi->substream, msg, len); |
| 102 | } |
| 103 | } |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 104 | if (atomic) |
| 105 | read_unlock(&rdev->filelist_lock); |
| 106 | else |
| 107 | up_read(&rdev->filelist_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * receive an event from the remote virmidi port |
| 114 | * |
| 115 | * for rawmidi inputs, you can call this function from the event |
| 116 | * handler of a remote port which is attached to the virmidi via |
| 117 | * SNDRV_VIRMIDI_SEQ_ATTACH. |
| 118 | */ |
Adrian Bunk | 123992f | 2005-05-18 18:02:04 +0200 | [diff] [blame] | 119 | #if 0 |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 120 | int snd_virmidi_receive(struct snd_rawmidi *rmidi, struct snd_seq_event *ev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 122 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | rdev = rmidi->private_data; |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 125 | return snd_virmidi_dev_receive_event(rdev, ev, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
Adrian Bunk | 123992f | 2005-05-18 18:02:04 +0200 | [diff] [blame] | 127 | #endif /* 0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * event handler of virmidi port |
| 131 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 132 | static int snd_virmidi_event_input(struct snd_seq_event *ev, int direct, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | void *private_data, int atomic, int hop) |
| 134 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 135 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | rdev = private_data; |
| 138 | if (!(rdev->flags & SNDRV_VIRMIDI_USE)) |
| 139 | return 0; /* ignored */ |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 140 | return snd_virmidi_dev_receive_event(rdev, ev, atomic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | /* |
| 144 | * trigger rawmidi stream for input |
| 145 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 146 | static void snd_virmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 148 | struct snd_virmidi *vmidi = substream->runtime->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if (up) { |
| 151 | vmidi->trigger = 1; |
| 152 | } else { |
| 153 | vmidi->trigger = 0; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * trigger rawmidi stream for output |
| 159 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 160 | static void snd_virmidi_output_trigger(struct snd_rawmidi_substream *substream, int up) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 162 | struct snd_virmidi *vmidi = substream->runtime->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | int count, res; |
| 164 | unsigned char buf[32], *pbuf; |
Takashi Iwai | 06ab300 | 2016-01-31 11:57:41 +0100 | [diff] [blame] | 165 | unsigned long flags; |
Takashi Iwai | b1e4b1c | 2018-07-26 14:27:59 +0200 | [diff] [blame] | 166 | bool check_resched = !in_atomic(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | if (up) { |
| 169 | vmidi->trigger = 1; |
| 170 | if (vmidi->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH && |
| 171 | !(vmidi->rdev->flags & SNDRV_VIRMIDI_SUBSCRIBE)) { |
Takashi Iwai | 06ab300 | 2016-01-31 11:57:41 +0100 | [diff] [blame] | 172 | while (snd_rawmidi_transmit(substream, buf, |
| 173 | sizeof(buf)) > 0) { |
| 174 | /* ignored */ |
| 175 | } |
| 176 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
Takashi Iwai | 9551857 | 2018-04-26 09:17:45 +0200 | [diff] [blame] | 178 | spin_lock_irqsave(&substream->runtime->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | if (vmidi->event.type != SNDRV_SEQ_EVENT_NONE) { |
Takashi Iwai | 62c5549e | 2006-02-22 17:14:34 +0100 | [diff] [blame] | 180 | if (snd_seq_kernel_client_dispatch(vmidi->client, &vmidi->event, in_atomic(), 0) < 0) |
Takashi Iwai | 9551857 | 2018-04-26 09:17:45 +0200 | [diff] [blame] | 181 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | vmidi->event.type = SNDRV_SEQ_EVENT_NONE; |
| 183 | } |
| 184 | while (1) { |
Takashi Iwai | 06ab300 | 2016-01-31 11:57:41 +0100 | [diff] [blame] | 185 | count = __snd_rawmidi_transmit_peek(substream, buf, sizeof(buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (count <= 0) |
| 187 | break; |
| 188 | pbuf = buf; |
| 189 | while (count > 0) { |
| 190 | res = snd_midi_event_encode(vmidi->parser, pbuf, count, &vmidi->event); |
| 191 | if (res < 0) { |
| 192 | snd_midi_event_reset_encode(vmidi->parser); |
| 193 | continue; |
| 194 | } |
Takashi Iwai | 06ab300 | 2016-01-31 11:57:41 +0100 | [diff] [blame] | 195 | __snd_rawmidi_transmit_ack(substream, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | pbuf += res; |
| 197 | count -= res; |
| 198 | if (vmidi->event.type != SNDRV_SEQ_EVENT_NONE) { |
Takashi Iwai | 62c5549e | 2006-02-22 17:14:34 +0100 | [diff] [blame] | 199 | if (snd_seq_kernel_client_dispatch(vmidi->client, &vmidi->event, in_atomic(), 0) < 0) |
Takashi Iwai | 06ab300 | 2016-01-31 11:57:41 +0100 | [diff] [blame] | 200 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | vmidi->event.type = SNDRV_SEQ_EVENT_NONE; |
| 202 | } |
| 203 | } |
Takashi Iwai | b1e4b1c | 2018-07-26 14:27:59 +0200 | [diff] [blame] | 204 | if (!check_resched) |
| 205 | continue; |
| 206 | /* do temporary unlock & cond_resched() for avoiding |
| 207 | * CPU soft lockup, which may happen via a write from |
| 208 | * a huge rawmidi buffer |
| 209 | */ |
| 210 | spin_unlock_irqrestore(&substream->runtime->lock, flags); |
| 211 | cond_resched(); |
| 212 | spin_lock_irqsave(&substream->runtime->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
Takashi Iwai | 06ab300 | 2016-01-31 11:57:41 +0100 | [diff] [blame] | 214 | out: |
| 215 | spin_unlock_irqrestore(&substream->runtime->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } else { |
| 217 | vmidi->trigger = 0; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * open rawmidi handle for input |
| 223 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 224 | static int snd_virmidi_input_open(struct snd_rawmidi_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 226 | struct snd_virmidi_dev *rdev = substream->rmidi->private_data; |
| 227 | struct snd_rawmidi_runtime *runtime = substream->runtime; |
| 228 | struct snd_virmidi *vmidi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
Takashi Iwai | ecca82b | 2005-09-09 14:20:49 +0200 | [diff] [blame] | 230 | vmidi = kzalloc(sizeof(*vmidi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | if (vmidi == NULL) |
| 232 | return -ENOMEM; |
| 233 | vmidi->substream = substream; |
| 234 | if (snd_midi_event_new(0, &vmidi->parser) < 0) { |
| 235 | kfree(vmidi); |
| 236 | return -ENOMEM; |
| 237 | } |
| 238 | vmidi->seq_mode = rdev->seq_mode; |
| 239 | vmidi->client = rdev->client; |
| 240 | vmidi->port = rdev->port; |
| 241 | runtime->private_data = vmidi; |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 242 | down_write(&rdev->filelist_sem); |
| 243 | write_lock_irq(&rdev->filelist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | list_add_tail(&vmidi->list, &rdev->filelist); |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 245 | write_unlock_irq(&rdev->filelist_lock); |
| 246 | up_write(&rdev->filelist_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | vmidi->rdev = rdev; |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * open rawmidi handle for output |
| 253 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 254 | static int snd_virmidi_output_open(struct snd_rawmidi_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 256 | struct snd_virmidi_dev *rdev = substream->rmidi->private_data; |
| 257 | struct snd_rawmidi_runtime *runtime = substream->runtime; |
| 258 | struct snd_virmidi *vmidi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Takashi Iwai | ecca82b | 2005-09-09 14:20:49 +0200 | [diff] [blame] | 260 | vmidi = kzalloc(sizeof(*vmidi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (vmidi == NULL) |
| 262 | return -ENOMEM; |
| 263 | vmidi->substream = substream; |
| 264 | if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &vmidi->parser) < 0) { |
| 265 | kfree(vmidi); |
| 266 | return -ENOMEM; |
| 267 | } |
| 268 | vmidi->seq_mode = rdev->seq_mode; |
| 269 | vmidi->client = rdev->client; |
| 270 | vmidi->port = rdev->port; |
| 271 | snd_virmidi_init_event(vmidi, &vmidi->event); |
| 272 | vmidi->rdev = rdev; |
| 273 | runtime->private_data = vmidi; |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * close rawmidi handle for input |
| 279 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 280 | static int snd_virmidi_input_close(struct snd_rawmidi_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
Takashi Iwai | 2d1b5c0 | 2016-02-01 12:06:42 +0100 | [diff] [blame] | 282 | struct snd_virmidi_dev *rdev = substream->rmidi->private_data; |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 283 | struct snd_virmidi *vmidi = substream->runtime->private_data; |
Takashi Iwai | 2d1b5c0 | 2016-02-01 12:06:42 +0100 | [diff] [blame] | 284 | |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 285 | down_write(&rdev->filelist_sem); |
Takashi Iwai | 2d1b5c0 | 2016-02-01 12:06:42 +0100 | [diff] [blame] | 286 | write_lock_irq(&rdev->filelist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | list_del(&vmidi->list); |
Takashi Iwai | 2d1b5c0 | 2016-02-01 12:06:42 +0100 | [diff] [blame] | 288 | write_unlock_irq(&rdev->filelist_lock); |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 289 | up_write(&rdev->filelist_sem); |
Takashi Iwai | 2d1b5c0 | 2016-02-01 12:06:42 +0100 | [diff] [blame] | 290 | snd_midi_event_free(vmidi->parser); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | substream->runtime->private_data = NULL; |
| 292 | kfree(vmidi); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * close rawmidi handle for output |
| 298 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 299 | static int snd_virmidi_output_close(struct snd_rawmidi_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 301 | struct snd_virmidi *vmidi = substream->runtime->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | snd_midi_event_free(vmidi->parser); |
| 303 | substream->runtime->private_data = NULL; |
| 304 | kfree(vmidi); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * subscribe callback - allow output to rawmidi device |
| 310 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 311 | static int snd_virmidi_subscribe(void *private_data, |
| 312 | struct snd_seq_port_subscribe *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 314 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | rdev = private_data; |
| 317 | if (!try_module_get(rdev->card->module)) |
| 318 | return -EFAULT; |
| 319 | rdev->flags |= SNDRV_VIRMIDI_SUBSCRIBE; |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * unsubscribe callback - disallow output to rawmidi device |
| 325 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 326 | static int snd_virmidi_unsubscribe(void *private_data, |
| 327 | struct snd_seq_port_subscribe *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 329 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | rdev = private_data; |
| 332 | rdev->flags &= ~SNDRV_VIRMIDI_SUBSCRIBE; |
| 333 | module_put(rdev->card->module); |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | |
| 338 | /* |
| 339 | * use callback - allow input to rawmidi device |
| 340 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 341 | static int snd_virmidi_use(void *private_data, |
| 342 | struct snd_seq_port_subscribe *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 344 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | rdev = private_data; |
| 347 | if (!try_module_get(rdev->card->module)) |
| 348 | return -EFAULT; |
| 349 | rdev->flags |= SNDRV_VIRMIDI_USE; |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * unuse callback - disallow input to rawmidi device |
| 355 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 356 | static int snd_virmidi_unuse(void *private_data, |
| 357 | struct snd_seq_port_subscribe *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 359 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | rdev = private_data; |
| 362 | rdev->flags &= ~SNDRV_VIRMIDI_USE; |
| 363 | module_put(rdev->card->module); |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | |
| 368 | /* |
| 369 | * Register functions |
| 370 | */ |
| 371 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 372 | static struct snd_rawmidi_ops snd_virmidi_input_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | .open = snd_virmidi_input_open, |
| 374 | .close = snd_virmidi_input_close, |
| 375 | .trigger = snd_virmidi_input_trigger, |
| 376 | }; |
| 377 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 378 | static struct snd_rawmidi_ops snd_virmidi_output_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | .open = snd_virmidi_output_open, |
| 380 | .close = snd_virmidi_output_close, |
| 381 | .trigger = snd_virmidi_output_trigger, |
| 382 | }; |
| 383 | |
| 384 | /* |
| 385 | * create a sequencer client and a port |
| 386 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 387 | static int snd_virmidi_dev_attach_seq(struct snd_virmidi_dev *rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | { |
| 389 | int client; |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 390 | struct snd_seq_port_callback pcallbacks; |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 391 | struct snd_seq_port_info *pinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | int err; |
| 393 | |
| 394 | if (rdev->client >= 0) |
| 395 | return 0; |
| 396 | |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 397 | pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL); |
Clemens Ladisch | 7b6d924 | 2005-12-12 09:33:37 +0100 | [diff] [blame] | 398 | if (!pinfo) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | err = -ENOMEM; |
| 400 | goto __error; |
| 401 | } |
| 402 | |
Clemens Ladisch | 7b6d924 | 2005-12-12 09:33:37 +0100 | [diff] [blame] | 403 | client = snd_seq_create_kernel_client(rdev->card, rdev->device, |
| 404 | "%s %d-%d", rdev->rmidi->name, |
| 405 | rdev->card->number, |
| 406 | rdev->device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (client < 0) { |
| 408 | err = client; |
| 409 | goto __error; |
| 410 | } |
| 411 | rdev->client = client; |
| 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | /* create a port */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | pinfo->addr.client = client; |
| 415 | sprintf(pinfo->name, "VirMIDI %d-%d", rdev->card->number, rdev->device); |
| 416 | /* set all capabilities */ |
| 417 | pinfo->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE; |
| 418 | pinfo->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ; |
| 419 | pinfo->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX; |
Clemens Ladisch | 450047a | 2006-05-02 16:08:41 +0200 | [diff] [blame] | 420 | pinfo->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
| 421 | | SNDRV_SEQ_PORT_TYPE_SOFTWARE |
| 422 | | SNDRV_SEQ_PORT_TYPE_PORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | pinfo->midi_channels = 16; |
| 424 | memset(&pcallbacks, 0, sizeof(pcallbacks)); |
| 425 | pcallbacks.owner = THIS_MODULE; |
| 426 | pcallbacks.private_data = rdev; |
| 427 | pcallbacks.subscribe = snd_virmidi_subscribe; |
| 428 | pcallbacks.unsubscribe = snd_virmidi_unsubscribe; |
| 429 | pcallbacks.use = snd_virmidi_use; |
| 430 | pcallbacks.unuse = snd_virmidi_unuse; |
| 431 | pcallbacks.event_input = snd_virmidi_event_input; |
| 432 | pinfo->kernel = &pcallbacks; |
Clemens Ladisch | 0aa0d38 | 2005-04-06 09:43:59 +0200 | [diff] [blame] | 433 | err = snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, pinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | if (err < 0) { |
| 435 | snd_seq_delete_kernel_client(client); |
| 436 | rdev->client = -1; |
| 437 | goto __error; |
| 438 | } |
| 439 | |
| 440 | rdev->port = pinfo->addr.port; |
| 441 | err = 0; /* success */ |
| 442 | |
| 443 | __error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | kfree(pinfo); |
| 445 | return err; |
| 446 | } |
| 447 | |
| 448 | |
| 449 | /* |
| 450 | * release the sequencer client |
| 451 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 452 | static void snd_virmidi_dev_detach_seq(struct snd_virmidi_dev *rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | { |
| 454 | if (rdev->client >= 0) { |
| 455 | snd_seq_delete_kernel_client(rdev->client); |
| 456 | rdev->client = -1; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * register the device |
| 462 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 463 | static int snd_virmidi_dev_register(struct snd_rawmidi *rmidi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 465 | struct snd_virmidi_dev *rdev = rmidi->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | int err; |
| 467 | |
| 468 | switch (rdev->seq_mode) { |
| 469 | case SNDRV_VIRMIDI_SEQ_DISPATCH: |
| 470 | err = snd_virmidi_dev_attach_seq(rdev); |
| 471 | if (err < 0) |
| 472 | return err; |
| 473 | break; |
| 474 | case SNDRV_VIRMIDI_SEQ_ATTACH: |
| 475 | if (rdev->client == 0) |
| 476 | return -EINVAL; |
| 477 | /* should check presence of port more strictly.. */ |
| 478 | break; |
| 479 | default: |
Takashi Iwai | 04cc79a | 2014-02-04 18:24:34 +0100 | [diff] [blame] | 480 | pr_err("ALSA: seq_virmidi: seq_mode is not set: %d\n", rdev->seq_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | return -EINVAL; |
| 482 | } |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | |
| 487 | /* |
| 488 | * unregister the device |
| 489 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 490 | static int snd_virmidi_dev_unregister(struct snd_rawmidi *rmidi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 492 | struct snd_virmidi_dev *rdev = rmidi->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | if (rdev->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH) |
| 495 | snd_virmidi_dev_detach_seq(rdev); |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * |
| 501 | */ |
Julia Lawall | efdbe3c | 2015-11-22 08:55:07 +0100 | [diff] [blame] | 502 | static const struct snd_rawmidi_global_ops snd_virmidi_global_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | .dev_register = snd_virmidi_dev_register, |
| 504 | .dev_unregister = snd_virmidi_dev_unregister, |
| 505 | }; |
| 506 | |
| 507 | /* |
| 508 | * free device |
| 509 | */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 510 | static void snd_virmidi_free(struct snd_rawmidi *rmidi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 512 | struct snd_virmidi_dev *rdev = rmidi->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | kfree(rdev); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * create a new device |
| 518 | * |
| 519 | */ |
| 520 | /* exported */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 521 | int snd_virmidi_new(struct snd_card *card, int device, struct snd_rawmidi **rrmidi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 523 | struct snd_rawmidi *rmidi; |
| 524 | struct snd_virmidi_dev *rdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | int err; |
| 526 | |
| 527 | *rrmidi = NULL; |
| 528 | if ((err = snd_rawmidi_new(card, "VirMidi", device, |
| 529 | 16, /* may be configurable */ |
| 530 | 16, /* may be configurable */ |
| 531 | &rmidi)) < 0) |
| 532 | return err; |
| 533 | strcpy(rmidi->name, rmidi->id); |
Takashi Iwai | ecca82b | 2005-09-09 14:20:49 +0200 | [diff] [blame] | 534 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | if (rdev == NULL) { |
| 536 | snd_device_free(card, rmidi); |
| 537 | return -ENOMEM; |
| 538 | } |
| 539 | rdev->card = card; |
| 540 | rdev->rmidi = rmidi; |
| 541 | rdev->device = device; |
| 542 | rdev->client = -1; |
Takashi Iwai | 6571ce8 | 2017-10-09 10:02:56 +0200 | [diff] [blame] | 543 | init_rwsem(&rdev->filelist_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | rwlock_init(&rdev->filelist_lock); |
| 545 | INIT_LIST_HEAD(&rdev->filelist); |
| 546 | rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH; |
| 547 | rmidi->private_data = rdev; |
| 548 | rmidi->private_free = snd_virmidi_free; |
| 549 | rmidi->ops = &snd_virmidi_global_ops; |
| 550 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_virmidi_input_ops); |
| 551 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_virmidi_output_ops); |
| 552 | rmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT | |
| 553 | SNDRV_RAWMIDI_INFO_OUTPUT | |
| 554 | SNDRV_RAWMIDI_INFO_DUPLEX; |
| 555 | *rrmidi = rmidi; |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * ENTRY functions |
| 561 | */ |
| 562 | |
| 563 | static int __init alsa_virmidi_init(void) |
| 564 | { |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | static void __exit alsa_virmidi_exit(void) |
| 569 | { |
| 570 | } |
| 571 | |
| 572 | module_init(alsa_virmidi_init) |
| 573 | module_exit(alsa_virmidi_exit) |
| 574 | |
| 575 | EXPORT_SYMBOL(snd_virmidi_new); |