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Linux/sound/usb/caiaq/midi.c

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  1 /*
  2  *   Copyright (c) 2006,2007 Daniel Mack
  3  *
  4  *   This program is free software; you can redistribute it and/or modify
  5  *   it under the terms of the GNU General Public License as published by
  6  *   the Free Software Foundation; either version 2 of the License, or
  7  *   (at your option) any later version.
  8  *
  9  *   This program is distributed in the hope that it will be useful,
 10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  *   GNU General Public License for more details.
 13  *
 14  *   You should have received a copy of the GNU General Public License
 15  *   along with this program; if not, write to the Free Software
 16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 17 */
 18 
 19 #include <linux/device.h>
 20 #include <linux/usb.h>
 21 #include <linux/gfp.h>
 22 #include <sound/rawmidi.h>
 23 #include <sound/core.h>
 24 #include <sound/pcm.h>
 25 
 26 #include "device.h"
 27 #include "midi.h"
 28 
 29 static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
 30 {
 31         return 0;
 32 }
 33 
 34 static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
 35 {
 36         return 0;
 37 }
 38 
 39 static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 40 {
 41         struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data;
 42 
 43         if (!cdev)
 44                 return;
 45 
 46         cdev->midi_receive_substream = up ? substream : NULL;
 47 }
 48 
 49 
 50 static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
 51 {
 52         return 0;
 53 }
 54 
 55 static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
 56 {
 57         struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data;
 58         if (cdev->midi_out_active) {
 59                 usb_kill_urb(&cdev->midi_out_urb);
 60                 cdev->midi_out_active = 0;
 61         }
 62         return 0;
 63 }
 64 
 65 static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *cdev,
 66                                     struct snd_rawmidi_substream *substream)
 67 {
 68         int len, ret;
 69         struct device *dev = caiaqdev_to_dev(cdev);
 70 
 71         cdev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
 72         cdev->midi_out_buf[1] = 0; /* port */
 73         len = snd_rawmidi_transmit(substream, cdev->midi_out_buf + 3,
 74                                    EP1_BUFSIZE - 3);
 75 
 76         if (len <= 0)
 77                 return;
 78 
 79         cdev->midi_out_buf[2] = len;
 80         cdev->midi_out_urb.transfer_buffer_length = len+3;
 81 
 82         ret = usb_submit_urb(&cdev->midi_out_urb, GFP_ATOMIC);
 83         if (ret < 0)
 84                 dev_err(dev,
 85                         "snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed,"
 86                         "ret=%d, len=%d\n", substream, ret, len);
 87         else
 88                 cdev->midi_out_active = 1;
 89 }
 90 
 91 static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 92 {
 93         struct snd_usb_caiaqdev *cdev = substream->rmidi->private_data;
 94 
 95         if (up) {
 96                 cdev->midi_out_substream = substream;
 97                 if (!cdev->midi_out_active)
 98                         snd_usb_caiaq_midi_send(cdev, substream);
 99         } else {
100                 cdev->midi_out_substream = NULL;
101         }
102 }
103 
104 
105 static const struct snd_rawmidi_ops snd_usb_caiaq_midi_output =
106 {
107         .open =         snd_usb_caiaq_midi_output_open,
108         .close =        snd_usb_caiaq_midi_output_close,
109         .trigger =      snd_usb_caiaq_midi_output_trigger,
110 };
111 
112 static const struct snd_rawmidi_ops snd_usb_caiaq_midi_input =
113 {
114         .open =         snd_usb_caiaq_midi_input_open,
115         .close =        snd_usb_caiaq_midi_input_close,
116         .trigger =      snd_usb_caiaq_midi_input_trigger,
117 };
118 
119 void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *cdev,
120                                      int port, const char *buf, int len)
121 {
122         if (!cdev->midi_receive_substream)
123                 return;
124 
125         snd_rawmidi_receive(cdev->midi_receive_substream, buf, len);
126 }
127 
128 int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
129 {
130         int ret;
131         struct snd_rawmidi *rmidi;
132 
133         ret = snd_rawmidi_new(device->chip.card, device->product_name, 0,
134                                         device->spec.num_midi_out,
135                                         device->spec.num_midi_in,
136                                         &rmidi);
137 
138         if (ret < 0)
139                 return ret;
140 
141         strlcpy(rmidi->name, device->product_name, sizeof(rmidi->name));
142 
143         rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
144         rmidi->private_data = device;
145 
146         if (device->spec.num_midi_out > 0) {
147                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
148                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
149                                     &snd_usb_caiaq_midi_output);
150         }
151 
152         if (device->spec.num_midi_in > 0) {
153                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
154                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
155                                     &snd_usb_caiaq_midi_input);
156         }
157 
158         device->rmidi = rmidi;
159 
160         return 0;
161 }
162 
163 void snd_usb_caiaq_midi_output_done(struct urb* urb)
164 {
165         struct snd_usb_caiaqdev *cdev = urb->context;
166 
167         cdev->midi_out_active = 0;
168         if (urb->status != 0)
169                 return;
170 
171         if (!cdev->midi_out_substream)
172                 return;
173 
174         snd_usb_caiaq_midi_send(cdev, cdev->midi_out_substream);
175 }
176 

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