This source file includes following definitions.
- line6_midi_receive
- line6_midi_transmit
- midi_sent
- send_midi_async
- line6_midi_output_open
- line6_midi_output_close
- line6_midi_output_trigger
- line6_midi_output_drain
- line6_midi_input_open
- line6_midi_input_close
- line6_midi_input_trigger
- snd_line6_new_midi
- snd_line6_midi_free
- line6_init_midi
1
2
3
4
5
6
7
8 #include <linux/slab.h>
9 #include <linux/usb.h>
10 #include <linux/export.h>
11 #include <sound/core.h>
12 #include <sound/rawmidi.h>
13
14 #include "driver.h"
15 #include "midi.h"
16
17 #define line6_rawmidi_substream_midi(substream) \
18 ((struct snd_line6_midi *)((substream)->rmidi->private_data))
19
20 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
21 int length);
22
23
24
25
26 void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
27 int length)
28 {
29 if (line6->line6midi->substream_receive)
30 snd_rawmidi_receive(line6->line6midi->substream_receive,
31 data, length);
32 }
33
34
35
36
37 static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
38 {
39 struct usb_line6 *line6 =
40 line6_rawmidi_substream_midi(substream)->line6;
41 struct snd_line6_midi *line6midi = line6->line6midi;
42 struct midi_buffer *mb = &line6midi->midibuf_out;
43 unsigned char chunk[LINE6_FALLBACK_MAXPACKETSIZE];
44 int req, done;
45
46 for (;;) {
47 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
48 done = snd_rawmidi_transmit_peek(substream, chunk, req);
49
50 if (done == 0)
51 break;
52
53 line6_midibuf_write(mb, chunk, done);
54 snd_rawmidi_transmit_ack(substream, done);
55 }
56
57 for (;;) {
58 done = line6_midibuf_read(mb, chunk,
59 LINE6_FALLBACK_MAXPACKETSIZE);
60
61 if (done == 0)
62 break;
63
64 send_midi_async(line6, chunk, done);
65 }
66 }
67
68
69
70
71 static void midi_sent(struct urb *urb)
72 {
73 unsigned long flags;
74 int status;
75 int num;
76 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
77
78 status = urb->status;
79 kfree(urb->transfer_buffer);
80 usb_free_urb(urb);
81
82 if (status == -ESHUTDOWN)
83 return;
84
85 spin_lock_irqsave(&line6->line6midi->lock, flags);
86 num = --line6->line6midi->num_active_send_urbs;
87
88 if (num == 0) {
89 line6_midi_transmit(line6->line6midi->substream_transmit);
90 num = line6->line6midi->num_active_send_urbs;
91 }
92
93 if (num == 0)
94 wake_up(&line6->line6midi->send_wait);
95
96 spin_unlock_irqrestore(&line6->line6midi->lock, flags);
97 }
98
99
100
101
102
103
104 static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
105 int length)
106 {
107 struct urb *urb;
108 int retval;
109 unsigned char *transfer_buffer;
110
111 urb = usb_alloc_urb(0, GFP_ATOMIC);
112
113 if (urb == NULL)
114 return -ENOMEM;
115
116 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
117
118 if (transfer_buffer == NULL) {
119 usb_free_urb(urb);
120 return -ENOMEM;
121 }
122
123 usb_fill_int_urb(urb, line6->usbdev,
124 usb_sndintpipe(line6->usbdev,
125 line6->properties->ep_ctrl_w),
126 transfer_buffer, length, midi_sent, line6,
127 line6->interval);
128 urb->actual_length = 0;
129 retval = usb_urb_ep_type_check(urb);
130 if (retval < 0)
131 goto error;
132
133 retval = usb_submit_urb(urb, GFP_ATOMIC);
134 if (retval < 0)
135 goto error;
136
137 ++line6->line6midi->num_active_send_urbs;
138 return 0;
139
140 error:
141 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
142 usb_free_urb(urb);
143 return retval;
144 }
145
146 static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
147 {
148 return 0;
149 }
150
151 static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
152 {
153 return 0;
154 }
155
156 static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
157 int up)
158 {
159 unsigned long flags;
160 struct usb_line6 *line6 =
161 line6_rawmidi_substream_midi(substream)->line6;
162
163 line6->line6midi->substream_transmit = substream;
164 spin_lock_irqsave(&line6->line6midi->lock, flags);
165
166 if (line6->line6midi->num_active_send_urbs == 0)
167 line6_midi_transmit(substream);
168
169 spin_unlock_irqrestore(&line6->line6midi->lock, flags);
170 }
171
172 static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
173 {
174 struct usb_line6 *line6 =
175 line6_rawmidi_substream_midi(substream)->line6;
176 struct snd_line6_midi *midi = line6->line6midi;
177
178 wait_event_interruptible(midi->send_wait,
179 midi->num_active_send_urbs == 0);
180 }
181
182 static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
183 {
184 return 0;
185 }
186
187 static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
188 {
189 return 0;
190 }
191
192 static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
193 int up)
194 {
195 struct usb_line6 *line6 =
196 line6_rawmidi_substream_midi(substream)->line6;
197
198 if (up)
199 line6->line6midi->substream_receive = substream;
200 else
201 line6->line6midi->substream_receive = NULL;
202 }
203
204 static const struct snd_rawmidi_ops line6_midi_output_ops = {
205 .open = line6_midi_output_open,
206 .close = line6_midi_output_close,
207 .trigger = line6_midi_output_trigger,
208 .drain = line6_midi_output_drain,
209 };
210
211 static const struct snd_rawmidi_ops line6_midi_input_ops = {
212 .open = line6_midi_input_open,
213 .close = line6_midi_input_close,
214 .trigger = line6_midi_input_trigger,
215 };
216
217
218 static int snd_line6_new_midi(struct usb_line6 *line6,
219 struct snd_rawmidi **rmidi_ret)
220 {
221 struct snd_rawmidi *rmidi;
222 int err;
223
224 err = snd_rawmidi_new(line6->card, "Line 6 MIDI", 0, 1, 1, rmidi_ret);
225 if (err < 0)
226 return err;
227
228 rmidi = *rmidi_ret;
229 strcpy(rmidi->id, line6->properties->id);
230 strcpy(rmidi->name, line6->properties->name);
231
232 rmidi->info_flags =
233 SNDRV_RAWMIDI_INFO_OUTPUT |
234 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
235
236 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
237 &line6_midi_output_ops);
238 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
239 &line6_midi_input_ops);
240 return 0;
241 }
242
243
244 static void snd_line6_midi_free(struct snd_rawmidi *rmidi)
245 {
246 struct snd_line6_midi *line6midi = rmidi->private_data;
247
248 line6_midibuf_destroy(&line6midi->midibuf_in);
249 line6_midibuf_destroy(&line6midi->midibuf_out);
250 kfree(line6midi);
251 }
252
253
254
255
256 int line6_init_midi(struct usb_line6 *line6)
257 {
258 int err;
259 struct snd_rawmidi *rmidi;
260 struct snd_line6_midi *line6midi;
261
262 if (!(line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI)) {
263
264 return 0;
265 }
266
267 err = snd_line6_new_midi(line6, &rmidi);
268 if (err < 0)
269 return err;
270
271 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
272 if (!line6midi)
273 return -ENOMEM;
274
275 rmidi->private_data = line6midi;
276 rmidi->private_free = snd_line6_midi_free;
277
278 init_waitqueue_head(&line6midi->send_wait);
279 spin_lock_init(&line6midi->lock);
280 line6midi->line6 = line6;
281
282 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
283 if (err < 0)
284 return err;
285
286 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
287 if (err < 0)
288 return err;
289
290 line6->line6midi = line6midi;
291 return 0;
292 }
293 EXPORT_SYMBOL_GPL(line6_init_midi);