/drivers/staging/line6/midi.c
C | 429 lines | 307 code | 77 blank | 45 comment | 36 complexity | 91e971171a76dbc297fd4cd5bc4caa99 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
1/* 2 * Line6 Linux USB driver - 0.9.1beta 3 * 4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation, version 2. 9 * 10 */ 11 12#include <linux/slab.h> 13#include <linux/usb.h> 14#include <sound/core.h> 15#include <sound/rawmidi.h> 16 17#include "audio.h" 18#include "driver.h" 19#include "midi.h" 20#include "pod.h" 21#include "usbdefs.h" 22 23#define line6_rawmidi_substream_midi(substream) \ 24 ((struct snd_line6_midi *)((substream)->rmidi->private_data)) 25 26static int send_midi_async(struct usb_line6 *line6, unsigned char *data, 27 int length); 28 29/* 30 Pass data received via USB to MIDI. 31*/ 32void line6_midi_receive(struct usb_line6 *line6, unsigned char *data, 33 int length) 34{ 35 if (line6->line6midi->substream_receive) 36 snd_rawmidi_receive(line6->line6midi->substream_receive, 37 data, length); 38} 39 40/* 41 Read data from MIDI buffer and transmit them via USB. 42*/ 43static void line6_midi_transmit(struct snd_rawmidi_substream *substream) 44{ 45 struct usb_line6 *line6 = 46 line6_rawmidi_substream_midi(substream)->line6; 47 struct snd_line6_midi *line6midi = line6->line6midi; 48 struct MidiBuffer *mb = &line6midi->midibuf_out; 49 unsigned long flags; 50 unsigned char chunk[line6->max_packet_size]; 51 int req, done; 52 53 spin_lock_irqsave(&line6->line6midi->midi_transmit_lock, flags); 54 55 for (;;) { 56 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size); 57 done = snd_rawmidi_transmit_peek(substream, chunk, req); 58 59 if (done == 0) 60 break; 61 62#ifdef CONFIG_LINE6_USB_DUMP_MIDI 63 line6_write_hexdump(line6, 's', chunk, done); 64#endif 65 line6_midibuf_write(mb, chunk, done); 66 snd_rawmidi_transmit_ack(substream, done); 67 } 68 69 for (;;) { 70 done = line6_midibuf_read(mb, chunk, line6->max_packet_size); 71 72 if (done == 0) 73 break; 74 75 if (line6_midibuf_skip_message 76 (mb, line6midi->midi_mask_transmit)) 77 continue; 78 79 send_midi_async(line6, chunk, done); 80 } 81 82 spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags); 83} 84 85/* 86 Notification of completion of MIDI transmission. 87*/ 88static void midi_sent(struct urb *urb) 89{ 90 unsigned long flags; 91 int status; 92 int num; 93 struct usb_line6 *line6 = (struct usb_line6 *)urb->context; 94 95 status = urb->status; 96 kfree(urb->transfer_buffer); 97 usb_free_urb(urb); 98 99 if (status == -ESHUTDOWN) 100 return; 101 102 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags); 103 num = --line6->line6midi->num_active_send_urbs; 104 105 if (num == 0) { 106 line6_midi_transmit(line6->line6midi->substream_transmit); 107 num = line6->line6midi->num_active_send_urbs; 108 } 109 110 if (num == 0) 111 wake_up(&line6->line6midi->send_wait); 112 113 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags); 114} 115 116/* 117 Send an asynchronous MIDI message. 118 Assumes that line6->line6midi->send_urb_lock is held 119 (i.e., this function is serialized). 120*/ 121static int send_midi_async(struct usb_line6 *line6, unsigned char *data, 122 int length) 123{ 124 struct urb *urb; 125 int retval; 126 unsigned char *transfer_buffer; 127 128 urb = usb_alloc_urb(0, GFP_ATOMIC); 129 130 if (urb == NULL) { 131 dev_err(line6->ifcdev, "Out of memory\n"); 132 return -ENOMEM; 133 } 134#ifdef CONFIG_LINE6_USB_DUMP_CTRL 135 line6_write_hexdump(line6, 'S', data, length); 136#endif 137 138 transfer_buffer = kmalloc(length, GFP_ATOMIC); 139 140 if (transfer_buffer == NULL) { 141 usb_free_urb(urb); 142 dev_err(line6->ifcdev, "Out of memory\n"); 143 return -ENOMEM; 144 } 145 146 memcpy(transfer_buffer, data, length); 147 usb_fill_int_urb(urb, line6->usbdev, 148 usb_sndbulkpipe(line6->usbdev, 149 line6->ep_control_write), 150 transfer_buffer, length, midi_sent, line6, 151 line6->interval); 152 urb->actual_length = 0; 153 retval = usb_submit_urb(urb, GFP_ATOMIC); 154 155 if (retval < 0) { 156 dev_err(line6->ifcdev, "usb_submit_urb failed\n"); 157 usb_free_urb(urb); 158 return -EINVAL; 159 } 160 161 ++line6->line6midi->num_active_send_urbs; 162 163 switch (line6->usbdev->descriptor.idProduct) { 164 case LINE6_DEVID_BASSPODXT: 165 case LINE6_DEVID_BASSPODXTLIVE: 166 case LINE6_DEVID_BASSPODXTPRO: 167 case LINE6_DEVID_PODXT: 168 case LINE6_DEVID_PODXTLIVE: 169 case LINE6_DEVID_PODXTPRO: 170 case LINE6_DEVID_POCKETPOD: 171 line6_pod_midi_postprocess((struct usb_line6_pod *)line6, data, 172 length); 173 break; 174 175 case LINE6_DEVID_VARIAX: 176 break; 177 178 default: 179 MISSING_CASE; 180 } 181 182 return 0; 183} 184 185static int line6_midi_output_open(struct snd_rawmidi_substream *substream) 186{ 187 return 0; 188} 189 190static int line6_midi_output_close(struct snd_rawmidi_substream *substream) 191{ 192 return 0; 193} 194 195static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream, 196 int up) 197{ 198 unsigned long flags; 199 struct usb_line6 *line6 = 200 line6_rawmidi_substream_midi(substream)->line6; 201 202 line6->line6midi->substream_transmit = substream; 203 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags); 204 205 if (line6->line6midi->num_active_send_urbs == 0) 206 line6_midi_transmit(substream); 207 208 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags); 209} 210 211static void line6_midi_output_drain(struct snd_rawmidi_substream *substream) 212{ 213 struct usb_line6 *line6 = 214 line6_rawmidi_substream_midi(substream)->line6; 215 struct snd_line6_midi *midi = line6->line6midi; 216 wait_event_interruptible(midi->send_wait, 217 midi->num_active_send_urbs == 0); 218} 219 220static int line6_midi_input_open(struct snd_rawmidi_substream *substream) 221{ 222 return 0; 223} 224 225static int line6_midi_input_close(struct snd_rawmidi_substream *substream) 226{ 227 return 0; 228} 229 230static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream, 231 int up) 232{ 233 struct usb_line6 *line6 = 234 line6_rawmidi_substream_midi(substream)->line6; 235 236 if (up) 237 line6->line6midi->substream_receive = substream; 238 else 239 line6->line6midi->substream_receive = 0; 240} 241 242static struct snd_rawmidi_ops line6_midi_output_ops = { 243 .open = line6_midi_output_open, 244 .close = line6_midi_output_close, 245 .trigger = line6_midi_output_trigger, 246 .drain = line6_midi_output_drain, 247}; 248 249static struct snd_rawmidi_ops line6_midi_input_ops = { 250 .open = line6_midi_input_open, 251 .close = line6_midi_input_close, 252 .trigger = line6_midi_input_trigger, 253}; 254 255/* 256 Cleanup the Line6 MIDI device. 257*/ 258static void line6_cleanup_midi(struct snd_rawmidi *rmidi) 259{ 260} 261 262/* Create a MIDI device */ 263static int snd_line6_new_midi(struct snd_line6_midi *line6midi) 264{ 265 struct snd_rawmidi *rmidi; 266 int err; 267 268 err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1, 269 &rmidi); 270 if (err < 0) 271 return err; 272 273 rmidi->private_data = line6midi; 274 rmidi->private_free = line6_cleanup_midi; 275 strcpy(rmidi->id, line6midi->line6->properties->id); 276 strcpy(rmidi->name, line6midi->line6->properties->name); 277 278 rmidi->info_flags = 279 SNDRV_RAWMIDI_INFO_OUTPUT | 280 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX; 281 282 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 283 &line6_midi_output_ops); 284 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 285 &line6_midi_input_ops); 286 return 0; 287} 288 289/* 290 "read" request on "midi_mask_transmit" special file. 291*/ 292static ssize_t midi_get_midi_mask_transmit(struct device *dev, 293 struct device_attribute *attr, 294 char *buf) 295{ 296 struct usb_interface *interface = to_usb_interface(dev); 297 struct usb_line6 *line6 = usb_get_intfdata(interface); 298 return sprintf(buf, "%d\n", line6->line6midi->midi_mask_transmit); 299} 300 301/* 302 "write" request on "midi_mask" special file. 303*/ 304static ssize_t midi_set_midi_mask_transmit(struct device *dev, 305 struct device_attribute *attr, 306 const char *buf, size_t count) 307{ 308 struct usb_interface *interface = to_usb_interface(dev); 309 struct usb_line6 *line6 = usb_get_intfdata(interface); 310 unsigned long value; 311 int ret; 312 313 ret = strict_strtoul(buf, 10, &value); 314 if (ret) 315 return ret; 316 317 line6->line6midi->midi_mask_transmit = value; 318 return count; 319} 320 321/* 322 "read" request on "midi_mask_receive" special file. 323*/ 324static ssize_t midi_get_midi_mask_receive(struct device *dev, 325 struct device_attribute *attr, 326 char *buf) 327{ 328 struct usb_interface *interface = to_usb_interface(dev); 329 struct usb_line6 *line6 = usb_get_intfdata(interface); 330 return sprintf(buf, "%d\n", line6->line6midi->midi_mask_receive); 331} 332 333/* 334 "write" request on "midi_mask" special file. 335*/ 336static ssize_t midi_set_midi_mask_receive(struct device *dev, 337 struct device_attribute *attr, 338 const char *buf, size_t count) 339{ 340 struct usb_interface *interface = to_usb_interface(dev); 341 struct usb_line6 *line6 = usb_get_intfdata(interface); 342 unsigned long value; 343 int ret; 344 345 ret = strict_strtoul(buf, 10, &value); 346 if (ret) 347 return ret; 348 349 line6->line6midi->midi_mask_receive = value; 350 return count; 351} 352 353static DEVICE_ATTR(midi_mask_transmit, S_IWUSR | S_IRUGO, 354 midi_get_midi_mask_transmit, midi_set_midi_mask_transmit); 355static DEVICE_ATTR(midi_mask_receive, S_IWUSR | S_IRUGO, 356 midi_get_midi_mask_receive, midi_set_midi_mask_receive); 357 358/* MIDI device destructor */ 359static int snd_line6_midi_free(struct snd_device *device) 360{ 361 struct snd_line6_midi *line6midi = device->device_data; 362 device_remove_file(line6midi->line6->ifcdev, 363 &dev_attr_midi_mask_transmit); 364 device_remove_file(line6midi->line6->ifcdev, 365 &dev_attr_midi_mask_receive); 366 line6_midibuf_destroy(&line6midi->midibuf_in); 367 line6_midibuf_destroy(&line6midi->midibuf_out); 368 return 0; 369} 370 371/* 372 Initialize the Line6 MIDI subsystem. 373*/ 374int line6_init_midi(struct usb_line6 *line6) 375{ 376 static struct snd_device_ops midi_ops = { 377 .dev_free = snd_line6_midi_free, 378 }; 379 380 int err; 381 struct snd_line6_midi *line6midi; 382 383 if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) { 384 /* skip MIDI initialization and report success */ 385 return 0; 386 } 387 388 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL); 389 390 if (line6midi == NULL) 391 return -ENOMEM; 392 393 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0); 394 if (err < 0) 395 return err; 396 397 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1); 398 if (err < 0) 399 return err; 400 401 line6midi->line6 = line6; 402 line6midi->midi_mask_transmit = 1; 403 line6midi->midi_mask_receive = 4; 404 line6->line6midi = line6midi; 405 406 err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi, 407 &midi_ops); 408 if (err < 0) 409 return err; 410 411 snd_card_set_dev(line6->card, line6->ifcdev); 412 413 err = snd_line6_new_midi(line6midi); 414 if (err < 0) 415 return err; 416 417 err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_transmit); 418 if (err < 0) 419 return err; 420 421 err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_receive); 422 if (err < 0) 423 return err; 424 425 init_waitqueue_head(&line6midi->send_wait); 426 spin_lock_init(&line6midi->send_urb_lock); 427 spin_lock_init(&line6midi->midi_transmit_lock); 428 return 0; 429}