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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
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
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->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 line6_midibuf_write(mb, chunk, done);
63 snd_rawmidi_transmit_ack(substream, done);
64 }
65
66 for (;;) {
67 done = line6_midibuf_read(mb, chunk, line6->max_packet_size);
68
69 if (done == 0)
70 break;
71
72 send_midi_async(line6, chunk, done);
73 }
74
75 spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
76}
77
78
79
80
81static void midi_sent(struct urb *urb)
82{
83 unsigned long flags;
84 int status;
85 int num;
86 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
87
88 status = urb->status;
89 kfree(urb->transfer_buffer);
90 usb_free_urb(urb);
91
92 if (status == -ESHUTDOWN)
93 return;
94
95 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
96 num = --line6->line6midi->num_active_send_urbs;
97
98 if (num == 0) {
99 line6_midi_transmit(line6->line6midi->substream_transmit);
100 num = line6->line6midi->num_active_send_urbs;
101 }
102
103 if (num == 0)
104 wake_up(&line6->line6midi->send_wait);
105
106 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
107}
108
109
110
111
112
113
114static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
115 int length)
116{
117 struct urb *urb;
118 int retval;
119 unsigned char *transfer_buffer;
120
121 urb = usb_alloc_urb(0, GFP_ATOMIC);
122
123 if (urb == NULL) {
124 dev_err(line6->ifcdev, "Out of memory\n");
125 return -ENOMEM;
126 }
127
128 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
129
130 if (transfer_buffer == NULL) {
131 usb_free_urb(urb);
132 dev_err(line6->ifcdev, "Out of memory\n");
133 return -ENOMEM;
134 }
135
136 usb_fill_int_urb(urb, line6->usbdev,
137 usb_sndbulkpipe(line6->usbdev,
138 line6->ep_control_write),
139 transfer_buffer, length, midi_sent, line6,
140 line6->interval);
141 urb->actual_length = 0;
142 retval = usb_submit_urb(urb, GFP_ATOMIC);
143
144 if (retval < 0) {
145 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
146 usb_free_urb(urb);
147 return -EINVAL;
148 }
149
150 ++line6->line6midi->num_active_send_urbs;
151 return 0;
152}
153
154static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
155{
156 return 0;
157}
158
159static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
160{
161 return 0;
162}
163
164static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
165 int up)
166{
167 unsigned long flags;
168 struct usb_line6 *line6 =
169 line6_rawmidi_substream_midi(substream)->line6;
170
171 line6->line6midi->substream_transmit = substream;
172 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
173
174 if (line6->line6midi->num_active_send_urbs == 0)
175 line6_midi_transmit(substream);
176
177 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
178}
179
180static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
181{
182 struct usb_line6 *line6 =
183 line6_rawmidi_substream_midi(substream)->line6;
184 struct snd_line6_midi *midi = line6->line6midi;
185 wait_event_interruptible(midi->send_wait,
186 midi->num_active_send_urbs == 0);
187}
188
189static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
190{
191 return 0;
192}
193
194static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
195{
196 return 0;
197}
198
199static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
200 int up)
201{
202 struct usb_line6 *line6 =
203 line6_rawmidi_substream_midi(substream)->line6;
204
205 if (up)
206 line6->line6midi->substream_receive = substream;
207 else
208 line6->line6midi->substream_receive = 0;
209}
210
211static struct snd_rawmidi_ops line6_midi_output_ops = {
212 .open = line6_midi_output_open,
213 .close = line6_midi_output_close,
214 .trigger = line6_midi_output_trigger,
215 .drain = line6_midi_output_drain,
216};
217
218static struct snd_rawmidi_ops line6_midi_input_ops = {
219 .open = line6_midi_input_open,
220 .close = line6_midi_input_close,
221 .trigger = line6_midi_input_trigger,
222};
223
224
225
226
227static void line6_cleanup_midi(struct snd_rawmidi *rmidi)
228{
229}
230
231
232static int snd_line6_new_midi(struct snd_line6_midi *line6midi)
233{
234 struct snd_rawmidi *rmidi;
235 int err;
236
237 err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1,
238 &rmidi);
239 if (err < 0)
240 return err;
241
242 rmidi->private_data = line6midi;
243 rmidi->private_free = line6_cleanup_midi;
244 strcpy(rmidi->id, line6midi->line6->properties->id);
245 strcpy(rmidi->name, line6midi->line6->properties->name);
246
247 rmidi->info_flags =
248 SNDRV_RAWMIDI_INFO_OUTPUT |
249 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
250
251 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
252 &line6_midi_output_ops);
253 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
254 &line6_midi_input_ops);
255 return 0;
256}
257
258
259static int snd_line6_midi_free(struct snd_device *device)
260{
261 struct snd_line6_midi *line6midi = device->device_data;
262 line6_midibuf_destroy(&line6midi->midibuf_in);
263 line6_midibuf_destroy(&line6midi->midibuf_out);
264 return 0;
265}
266
267
268
269
270int line6_init_midi(struct usb_line6 *line6)
271{
272 static struct snd_device_ops midi_ops = {
273 .dev_free = snd_line6_midi_free,
274 };
275
276 int err;
277 struct snd_line6_midi *line6midi;
278
279 if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) {
280
281 return 0;
282 }
283
284 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
285
286 if (line6midi == NULL)
287 return -ENOMEM;
288
289 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
290 if (err < 0) {
291 kfree(line6midi);
292 return err;
293 }
294
295 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
296 if (err < 0) {
297 kfree(line6midi->midibuf_in.buf);
298 kfree(line6midi);
299 return err;
300 }
301
302 line6midi->line6 = line6;
303 line6->line6midi = line6midi;
304
305 err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi,
306 &midi_ops);
307 if (err < 0)
308 return err;
309
310 snd_card_set_dev(line6->card, line6->ifcdev);
311
312 err = snd_line6_new_midi(line6midi);
313 if (err < 0)
314 return err;
315
316 init_waitqueue_head(&line6midi->send_wait);
317 spin_lock_init(&line6midi->send_urb_lock);
318 spin_lock_init(&line6midi->midi_transmit_lock);
319 return 0;
320}
321
