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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 midi_buffer *mb = &line6midi->midibuf_out;
49 unsigned long flags;
50 unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE];
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 line6_midibuf_write(mb, chunk, done);
63 snd_rawmidi_transmit_ack(substream, done);
64 }
65
66 for (;;) {
67 done = line6_midibuf_read(mb, chunk,
68 LINE6_FALLBACK_MAXPACKETSIZE);
69
70 if (done == 0)
71 break;
72
73 send_midi_async(line6, chunk, done);
74 }
75
76 spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
77}
78
79/*
80 Notification of completion of MIDI transmission.
81*/
82static void midi_sent(struct urb *urb)
83{
84 unsigned long flags;
85 int status;
86 int num;
87 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
88
89 status = urb->status;
90 kfree(urb->transfer_buffer);
91 usb_free_urb(urb);
92
93 if (status == -ESHUTDOWN)
94 return;
95
96 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
97 num = --line6->line6midi->num_active_send_urbs;
98
99 if (num == 0) {
100 line6_midi_transmit(line6->line6midi->substream_transmit);
101 num = line6->line6midi->num_active_send_urbs;
102 }
103
104 if (num == 0)
105 wake_up(&line6->line6midi->send_wait);
106
107 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
108}
109
110/*
111 Send an asynchronous MIDI message.
112 Assumes that line6->line6midi->send_urb_lock is held
113 (i.e., this function is serialized).
114*/
115static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
116 int length)
117{
118 struct urb *urb;
119 int retval;
120 unsigned char *transfer_buffer;
121
122 urb = usb_alloc_urb(0, GFP_ATOMIC);
123
124 if (urb == NULL) {
125 dev_err(line6->ifcdev, "Out of memory\n");
126 return -ENOMEM;
127 }
128
129 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
130
131 if (transfer_buffer == NULL) {
132 usb_free_urb(urb);
133 dev_err(line6->ifcdev, "Out of memory\n");
134 return -ENOMEM;
135 }
136
137 usb_fill_int_urb(urb, line6->usbdev,
138 usb_sndbulkpipe(line6->usbdev,
139 line6->ep_control_write),
140 transfer_buffer, length, midi_sent, line6,
141 line6->interval);
142 urb->actual_length = 0;
143 retval = usb_submit_urb(urb, GFP_ATOMIC);
144
145 if (retval < 0) {
146 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
147 usb_free_urb(urb);
148 return retval;
149 }
150
151 ++line6->line6midi->num_active_send_urbs;
152 return 0;
153}
154
155static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
156{
157 return 0;
158}
159
160static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
161{
162 return 0;
163}
164
165static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
166 int up)
167{
168 unsigned long flags;
169 struct usb_line6 *line6 =
170 line6_rawmidi_substream_midi(substream)->line6;
171
172 line6->line6midi->substream_transmit = substream;
173 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
174
175 if (line6->line6midi->num_active_send_urbs == 0)
176 line6_midi_transmit(substream);
177
178 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
179}
180
181static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
182{
183 struct usb_line6 *line6 =
184 line6_rawmidi_substream_midi(substream)->line6;
185 struct snd_line6_midi *midi = line6->line6midi;
186 wait_event_interruptible(midi->send_wait,
187 midi->num_active_send_urbs == 0);
188}
189
190static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
191{
192 return 0;
193}
194
195static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
196{
197 return 0;
198}
199
200static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
201 int up)
202{
203 struct usb_line6 *line6 =
204 line6_rawmidi_substream_midi(substream)->line6;
205
206 if (up)
207 line6->line6midi->substream_receive = substream;
208 else
209 line6->line6midi->substream_receive = NULL;
210}
211
212static struct snd_rawmidi_ops line6_midi_output_ops = {
213 .open = line6_midi_output_open,
214 .close = line6_midi_output_close,
215 .trigger = line6_midi_output_trigger,
216 .drain = line6_midi_output_drain,
217};
218
219static struct snd_rawmidi_ops line6_midi_input_ops = {
220 .open = line6_midi_input_open,
221 .close = line6_midi_input_close,
222 .trigger = line6_midi_input_trigger,
223};
224
225/*
226 Cleanup the Line6 MIDI device.
227*/
228static void line6_cleanup_midi(struct snd_rawmidi *rmidi)
229{
230}
231
232/* Create a MIDI device */
233static int snd_line6_new_midi(struct snd_line6_midi *line6midi)
234{
235 struct snd_rawmidi *rmidi;
236 int err;
237
238 err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1,
239 &rmidi);
240 if (err < 0)
241 return err;
242
243 rmidi->private_data = line6midi;
244 rmidi->private_free = line6_cleanup_midi;
245 strcpy(rmidi->id, line6midi->line6->properties->id);
246 strcpy(rmidi->name, line6midi->line6->properties->name);
247
248 rmidi->info_flags =
249 SNDRV_RAWMIDI_INFO_OUTPUT |
250 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
251
252 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
253 &line6_midi_output_ops);
254 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
255 &line6_midi_input_ops);
256 return 0;
257}
258
259/* MIDI device destructor */
260static int snd_line6_midi_free(struct snd_device *device)
261{
262 struct snd_line6_midi *line6midi = device->device_data;
263 line6_midibuf_destroy(&line6midi->midibuf_in);
264 line6_midibuf_destroy(&line6midi->midibuf_out);
265 return 0;
266}
267
268/*
269 Initialize the Line6 MIDI subsystem.
270*/
271int line6_init_midi(struct usb_line6 *line6)
272{
273 static struct snd_device_ops midi_ops = {
274 .dev_free = snd_line6_midi_free,
275 };
276
277 int err;
278 struct snd_line6_midi *line6midi;
279
280 if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) {
281 /* skip MIDI initialization and report success */
282 return 0;
283 }
284
285 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
286
287 if (line6midi == NULL)
288 return -ENOMEM;
289
290 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
291 if (err < 0) {
292 kfree(line6midi);
293 return err;
294 }
295
296 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
297 if (err < 0) {
298 kfree(line6midi->midibuf_in.buf);
299 kfree(line6midi);
300 return err;
301 }
302
303 line6midi->line6 = line6;
304 line6->line6midi = line6midi;
305
306 err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi,
307 &midi_ops);
308 if (err < 0)
309 return err;
310
311 err = snd_line6_new_midi(line6midi);
312 if (err < 0)
313 return err;
314
315 init_waitqueue_head(&line6midi->send_wait);
316 spin_lock_init(&line6midi->send_urb_lock);
317 spin_lock_init(&line6midi->midi_transmit_lock);
318 return 0;
319}