1 /*
2 * Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
3 * Creative Audio MIDI, for the CA0106 Driver
4 * Version: 0.0.1
5 *
6 * Changelog:
7 * Implementation is based on mpu401 and emu10k1x and
8 * tested with ca0106.
9 * mpu401: Copyright (c) by Jaroslav Kysela <perex@perex.cz>
10 * emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 *
27 */
28
29 #include <linux/spinlock.h>
30 #include <sound/core.h>
31 #include <sound/rawmidi.h>
32
33 #include "ca_midi.h"
34
35 #define ca_midi_write_data(midi, data) midi->write(midi, data, 0)
36 #define ca_midi_write_cmd(midi, data) midi->write(midi, data, 1)
37 #define ca_midi_read_data(midi) midi->read(midi, 0)
38 #define ca_midi_read_stat(midi) midi->read(midi, 1)
39 #define ca_midi_input_avail(midi) (!(ca_midi_read_stat(midi) & midi->input_avail))
40 #define ca_midi_output_ready(midi) (!(ca_midi_read_stat(midi) & midi->output_ready))
41
42 static void ca_midi_clear_rx(struct snd_ca_midi *midi)
43 {
44 int timeout = 100000;
45 for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
46 ca_midi_read_data(midi);
47 #ifdef CONFIG_SND_DEBUG
48 if (timeout <= 0)
49 snd_printk(KERN_ERR "ca_midi_clear_rx: timeout (status = 0x%x)\n",
50 ca_midi_read_stat(midi));
51 #endif
52 }
53
54 static void ca_midi_interrupt(struct snd_ca_midi *midi, unsigned int status)
55 {
56 unsigned char byte;
57
58 if (midi->rmidi == NULL) {
59 midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable);
60 return;
61 }
62
63 spin_lock(&midi->input_lock);
64 if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
65 if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
66 ca_midi_clear_rx(midi);
67 } else {
68 byte = ca_midi_read_data(midi);
69 if(midi->substream_input)
70 snd_rawmidi_receive(midi->substream_input, &byte, 1);
71
72
73 }
74 }
75 spin_unlock(&midi->input_lock);
76
77 spin_lock(&midi->output_lock);
78 if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
79 if (midi->substream_output &&
80 snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
81 ca_midi_write_data(midi, byte);
82 } else {
83 midi->interrupt_disable(midi,midi->tx_enable);
84 }
85 }
86 spin_unlock(&midi->output_lock);
87
88 }
89
90 static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack)
91 {
92 unsigned long flags;
93 int timeout, ok;
94
95 spin_lock_irqsave(&midi->input_lock, flags);
96 ca_midi_write_data(midi, 0x00);
97 /* ca_midi_clear_rx(midi); */
98
99 ca_midi_write_cmd(midi, cmd);
100 if (ack) {
101 ok = 0;
102 timeout = 10000;
103 while (!ok && timeout-- > 0) {
104 if (ca_midi_input_avail(midi)) {
105 if (ca_midi_read_data(midi) == midi->ack)
106 ok = 1;
107 }
108 }
109 if (!ok && ca_midi_read_data(midi) == midi->ack)
110 ok = 1;
111 } else {
112 ok = 1;
113 }
114 spin_unlock_irqrestore(&midi->input_lock, flags);
115 if (!ok)
116 snd_printk(KERN_ERR "ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
117 cmd,
118 midi->get_dev_id_port(midi->dev_id),
119 ca_midi_read_stat(midi),
120 ca_midi_read_data(midi));
121 }
122
123 static int ca_midi_input_open(struct snd_rawmidi_substream *substream)
124 {
125 struct snd_ca_midi *midi = substream->rmidi->private_data;
126 unsigned long flags;
127
128 snd_assert(midi->dev_id, return -ENXIO);
129 spin_lock_irqsave(&midi->open_lock, flags);
130 midi->midi_mode |= CA_MIDI_MODE_INPUT;
131 midi->substream_input = substream;
132 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
133 spin_unlock_irqrestore(&midi->open_lock, flags);
134 ca_midi_cmd(midi, midi->reset, 1);
135 ca_midi_cmd(midi, midi->enter_uart, 1);
136 } else {
137 spin_unlock_irqrestore(&midi->open_lock, flags);
138 }
139 return 0;
140 }
141
142 static int ca_midi_output_open(struct snd_rawmidi_substream *substream)
143 {
144 struct snd_ca_midi *midi = substream->rmidi->private_data;
145 unsigned long flags;
146
147 snd_assert(midi->dev_id, return -ENXIO);
148 spin_lock_irqsave(&midi->open_lock, flags);
149 midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
150 midi->substream_output = substream;
151 if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
152 spin_unlock_irqrestore(&midi->open_lock, flags);
153 ca_midi_cmd(midi, midi->reset, 1);
154 ca_midi_cmd(midi, midi->enter_uart, 1);
155 } else {
156 spin_unlock_irqrestore(&midi->open_lock, flags);
157 }
158 return 0;
159 }
160
161 static int ca_midi_input_close(struct snd_rawmidi_substream *substream)
162 {
163 struct snd_ca_midi *midi = substream->rmidi->private_data;
164 unsigned long flags;
165
166 snd_assert(midi->dev_id, return -ENXIO);
167 spin_lock_irqsave(&midi->open_lock, flags);
168 midi->interrupt_disable(midi,midi->rx_enable);
169 midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
170 midi->substream_input = NULL;
171 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
172 spin_unlock_irqrestore(&midi->open_lock, flags);
173 ca_midi_cmd(midi, midi->reset, 0);
174 } else {
175 spin_unlock_irqrestore(&midi->open_lock, flags);
176 }
177 return 0;
178 }
179
180 static int ca_midi_output_close(struct snd_rawmidi_substream *substream)
181 {
182 struct snd_ca_midi *midi = substream->rmidi->private_data;
183 unsigned long flags;
184 snd_assert(midi->dev_id, return -ENXIO);
185
186 spin_lock_irqsave(&midi->open_lock, flags);
187
188 midi->interrupt_disable(midi,midi->tx_enable);
189 midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
190 midi->substream_output = NULL;
191
192 if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
193 spin_unlock_irqrestore(&midi->open_lock, flags);
194 ca_midi_cmd(midi, midi->reset, 0);
195 } else {
196 spin_unlock_irqrestore(&midi->open_lock, flags);
197 }
198 return 0;
199 }
200
201 static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
202 {
203 struct snd_ca_midi *midi = substream->rmidi->private_data;
204 snd_assert(midi->dev_id, return);
205
206 if (up) {
207 midi->interrupt_enable(midi,midi->rx_enable);
208 } else {
209 midi->interrupt_disable(midi, midi->rx_enable);
210 }
211 }
212
213 static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
214 {
215 struct snd_ca_midi *midi = substream->rmidi->private_data;
216 unsigned long flags;
217
218 snd_assert(midi->dev_id, return);
219
220 if (up) {
221 int max = 4;
222 unsigned char byte;
223
224 spin_lock_irqsave(&midi->output_lock, flags);
225
226 /* try to send some amount of bytes here before interrupts */
227 while (max > 0) {
228 if (ca_midi_output_ready(midi)) {
229 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
230 snd_rawmidi_transmit(substream, &byte, 1) != 1) {
231 /* no more data */
232 spin_unlock_irqrestore(&midi->output_lock, flags);
233 return;
234 }
235 ca_midi_write_data(midi, byte);
236 max--;
237 } else {
238 break;
239 }
240 }
241
242 spin_unlock_irqrestore(&midi->output_lock, flags);
243 midi->interrupt_enable(midi,midi->tx_enable);
244
245 } else {
246 midi->interrupt_disable(midi,midi->tx_enable);
247 }
248 }
249
250 static struct snd_rawmidi_ops ca_midi_output =
251 {
252 .open = ca_midi_output_open,
253 .close = ca_midi_output_close,
254 .trigger = ca_midi_output_trigger,
255 };
256
257 static struct snd_rawmidi_ops ca_midi_input =
258 {
259 .open = ca_midi_input_open,
260 .close = ca_midi_input_close,
261 .trigger = ca_midi_input_trigger,
262 };
263
264 static void ca_midi_free(struct snd_ca_midi *midi)
265 {
266 midi->interrupt = NULL;
267 midi->interrupt_enable = NULL;
268 midi->interrupt_disable = NULL;
269 midi->read = NULL;
270 midi->write = NULL;
271 midi->get_dev_id_card = NULL;
272 midi->get_dev_id_port = NULL;
273 midi->rmidi = NULL;
274 }
275
276 static void ca_rmidi_free(struct snd_rawmidi *rmidi)
277 {
278 ca_midi_free(rmidi->private_data);
279 }
280
281 int __devinit ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
282 {
283 struct snd_rawmidi *rmidi;
284 int err;
285
286 if ((err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi)) < 0)
287 return err;
288
289 midi->dev_id = dev_id;
290 midi->interrupt = ca_midi_interrupt;
291
292 spin_lock_init(&midi->open_lock);
293 spin_lock_init(&midi->input_lock);
294 spin_lock_init(&midi->output_lock);
295
296 strcpy(rmidi->name, name);
297 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
298 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
299 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
300 SNDRV_RAWMIDI_INFO_INPUT |
301 SNDRV_RAWMIDI_INFO_DUPLEX;
302 rmidi->private_data = midi;
303 rmidi->private_free = ca_rmidi_free;
304
305 midi->rmidi = rmidi;
306 return 0;
307 }
308
309
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