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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/driver.h> | |
31 | #include <sound/core.h> | |
32 | #include <sound/rawmidi.h> | |
33 | ||
34 | #include "ca_midi.h" | |
35 | ||
36 | #define ca_midi_write_data(midi, data) midi->write(midi, data, 0) | |
37 | #define ca_midi_write_cmd(midi, data) midi->write(midi, data, 1) | |
38 | #define ca_midi_read_data(midi) midi->read(midi, 0) | |
39 | #define ca_midi_read_stat(midi) midi->read(midi, 1) | |
40 | #define ca_midi_input_avail(midi) (!(ca_midi_read_stat(midi) & midi->input_avail)) | |
41 | #define ca_midi_output_ready(midi) (!(ca_midi_read_stat(midi) & midi->output_ready)) | |
42 | ||
43 | static void ca_midi_clear_rx(struct snd_ca_midi *midi) | |
44 | { | |
45 | int timeout = 100000; | |
46 | for (; timeout > 0 && ca_midi_input_avail(midi); timeout--) | |
47 | ca_midi_read_data(midi); | |
48 | #ifdef CONFIG_SND_DEBUG | |
49 | if (timeout <= 0) | |
50 | snd_printk(KERN_ERR "ca_midi_clear_rx: timeout (status = 0x%x)\n", | |
51 | ca_midi_read_stat(midi)); | |
52 | #endif | |
53 | } | |
54 | ||
55 | static void ca_midi_interrupt(struct snd_ca_midi *midi, unsigned int status) | |
56 | { | |
57 | unsigned char byte; | |
58 | ||
59 | if (midi->rmidi == NULL) { | |
60 | midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable); | |
61 | return; | |
62 | } | |
63 | ||
64 | spin_lock(&midi->input_lock); | |
65 | if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) { | |
66 | if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) { | |
67 | ca_midi_clear_rx(midi); | |
68 | } else { | |
69 | byte = ca_midi_read_data(midi); | |
70 | if(midi->substream_input) | |
71 | snd_rawmidi_receive(midi->substream_input, &byte, 1); | |
72 | ||
73 | ||
74 | } | |
75 | } | |
76 | spin_unlock(&midi->input_lock); | |
77 | ||
78 | spin_lock(&midi->output_lock); | |
79 | if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) { | |
80 | if (midi->substream_output && | |
81 | snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) { | |
82 | ca_midi_write_data(midi, byte); | |
83 | } else { | |
84 | midi->interrupt_disable(midi,midi->tx_enable); | |
85 | } | |
86 | } | |
87 | spin_unlock(&midi->output_lock); | |
88 | ||
89 | } | |
90 | ||
91 | static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack) | |
92 | { | |
93 | unsigned long flags; | |
94 | int timeout, ok; | |
95 | ||
96 | spin_lock_irqsave(&midi->input_lock, flags); | |
97 | ca_midi_write_data(midi, 0x00); | |
98 | /* ca_midi_clear_rx(midi); */ | |
99 | ||
100 | ca_midi_write_cmd(midi, cmd); | |
101 | if (ack) { | |
102 | ok = 0; | |
103 | timeout = 10000; | |
104 | while (!ok && timeout-- > 0) { | |
105 | if (ca_midi_input_avail(midi)) { | |
106 | if (ca_midi_read_data(midi) == midi->ack) | |
107 | ok = 1; | |
108 | } | |
109 | } | |
110 | if (!ok && ca_midi_read_data(midi) == midi->ack) | |
111 | ok = 1; | |
112 | } else { | |
113 | ok = 1; | |
114 | } | |
115 | spin_unlock_irqrestore(&midi->input_lock, flags); | |
116 | if (!ok) | |
117 | snd_printk(KERN_ERR "ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n", | |
118 | cmd, | |
119 | midi->get_dev_id_port(midi->dev_id), | |
120 | ca_midi_read_stat(midi), | |
121 | ca_midi_read_data(midi)); | |
122 | } | |
123 | ||
124 | static int ca_midi_input_open(struct snd_rawmidi_substream *substream) | |
125 | { | |
126 | struct snd_ca_midi *midi = substream->rmidi->private_data; | |
127 | unsigned long flags; | |
128 | ||
129 | snd_assert(midi->dev_id, return -ENXIO); | |
130 | spin_lock_irqsave(&midi->open_lock, flags); | |
131 | midi->midi_mode |= CA_MIDI_MODE_INPUT; | |
132 | midi->substream_input = substream; | |
133 | if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) { | |
134 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
135 | ca_midi_cmd(midi, midi->reset, 1); | |
136 | ca_midi_cmd(midi, midi->enter_uart, 1); | |
137 | } else { | |
138 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int ca_midi_output_open(struct snd_rawmidi_substream *substream) | |
144 | { | |
145 | struct snd_ca_midi *midi = substream->rmidi->private_data; | |
146 | unsigned long flags; | |
147 | ||
148 | snd_assert(midi->dev_id, return -ENXIO); | |
149 | spin_lock_irqsave(&midi->open_lock, flags); | |
150 | midi->midi_mode |= CA_MIDI_MODE_OUTPUT; | |
151 | midi->substream_output = substream; | |
152 | if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) { | |
153 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
154 | ca_midi_cmd(midi, midi->reset, 1); | |
155 | ca_midi_cmd(midi, midi->enter_uart, 1); | |
156 | } else { | |
157 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
158 | } | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int ca_midi_input_close(struct snd_rawmidi_substream *substream) | |
163 | { | |
164 | struct snd_ca_midi *midi = substream->rmidi->private_data; | |
165 | unsigned long flags; | |
166 | ||
167 | snd_assert(midi->dev_id, return -ENXIO); | |
168 | spin_lock_irqsave(&midi->open_lock, flags); | |
169 | midi->interrupt_disable(midi,midi->rx_enable); | |
170 | midi->midi_mode &= ~CA_MIDI_MODE_INPUT; | |
171 | midi->substream_input = NULL; | |
172 | if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) { | |
173 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
174 | ca_midi_cmd(midi, midi->reset, 0); | |
175 | } else { | |
176 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int ca_midi_output_close(struct snd_rawmidi_substream *substream) | |
182 | { | |
183 | struct snd_ca_midi *midi = substream->rmidi->private_data; | |
184 | unsigned long flags; | |
185 | snd_assert(midi->dev_id, return -ENXIO); | |
186 | ||
187 | spin_lock_irqsave(&midi->open_lock, flags); | |
188 | ||
189 | midi->interrupt_disable(midi,midi->tx_enable); | |
190 | midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT; | |
191 | midi->substream_output = NULL; | |
192 | ||
193 | if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) { | |
194 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
195 | ca_midi_cmd(midi, midi->reset, 0); | |
196 | } else { | |
197 | spin_unlock_irqrestore(&midi->open_lock, flags); | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) | |
203 | { | |
204 | struct snd_ca_midi *midi = substream->rmidi->private_data; | |
205 | snd_assert(midi->dev_id, return); | |
206 | ||
207 | if (up) { | |
208 | midi->interrupt_enable(midi,midi->rx_enable); | |
209 | } else { | |
210 | midi->interrupt_disable(midi, midi->rx_enable); | |
211 | } | |
212 | } | |
213 | ||
214 | static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up) | |
215 | { | |
216 | struct snd_ca_midi *midi = substream->rmidi->private_data; | |
217 | unsigned long flags; | |
218 | ||
219 | snd_assert(midi->dev_id, return); | |
220 | ||
221 | if (up) { | |
222 | int max = 4; | |
223 | unsigned char byte; | |
224 | ||
225 | spin_lock_irqsave(&midi->output_lock, flags); | |
226 | ||
227 | /* try to send some amount of bytes here before interrupts */ | |
228 | while (max > 0) { | |
229 | if (ca_midi_output_ready(midi)) { | |
230 | if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) || | |
231 | snd_rawmidi_transmit(substream, &byte, 1) != 1) { | |
232 | /* no more data */ | |
233 | spin_unlock_irqrestore(&midi->output_lock, flags); | |
234 | return; | |
235 | } | |
236 | ca_midi_write_data(midi, byte); | |
237 | max--; | |
238 | } else { | |
239 | break; | |
240 | } | |
241 | } | |
242 | ||
243 | spin_unlock_irqrestore(&midi->output_lock, flags); | |
244 | midi->interrupt_enable(midi,midi->tx_enable); | |
245 | ||
246 | } else { | |
247 | midi->interrupt_disable(midi,midi->tx_enable); | |
248 | } | |
249 | } | |
250 | ||
251 | static struct snd_rawmidi_ops ca_midi_output = | |
252 | { | |
253 | .open = ca_midi_output_open, | |
254 | .close = ca_midi_output_close, | |
255 | .trigger = ca_midi_output_trigger, | |
256 | }; | |
257 | ||
258 | static struct snd_rawmidi_ops ca_midi_input = | |
259 | { | |
260 | .open = ca_midi_input_open, | |
261 | .close = ca_midi_input_close, | |
262 | .trigger = ca_midi_input_trigger, | |
263 | }; | |
264 | ||
265 | static void ca_midi_free(struct snd_ca_midi *midi) | |
266 | { | |
267 | midi->interrupt = NULL; | |
268 | midi->interrupt_enable = NULL; | |
269 | midi->interrupt_disable = NULL; | |
270 | midi->read = NULL; | |
271 | midi->write = NULL; | |
272 | midi->get_dev_id_card = NULL; | |
273 | midi->get_dev_id_port = NULL; | |
274 | midi->rmidi = NULL; | |
275 | } | |
276 | ||
277 | static void ca_rmidi_free(struct snd_rawmidi *rmidi) | |
278 | { | |
279 | ca_midi_free(rmidi->private_data); | |
280 | } | |
281 | ||
282 | int __devinit ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name) | |
283 | { | |
284 | struct snd_rawmidi *rmidi; | |
285 | int err; | |
286 | ||
287 | if ((err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi)) < 0) | |
288 | return err; | |
289 | ||
290 | midi->dev_id = dev_id; | |
291 | midi->interrupt = ca_midi_interrupt; | |
292 | ||
293 | spin_lock_init(&midi->open_lock); | |
294 | spin_lock_init(&midi->input_lock); | |
295 | spin_lock_init(&midi->output_lock); | |
296 | ||
297 | strcpy(rmidi->name, name); | |
298 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output); | |
299 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input); | |
300 | rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | | |
301 | SNDRV_RAWMIDI_INFO_INPUT | | |
302 | SNDRV_RAWMIDI_INFO_DUPLEX; | |
303 | rmidi->private_data = midi; | |
304 | rmidi->private_free = ca_rmidi_free; | |
305 | ||
306 | midi->rmidi = rmidi; | |
307 | return 0; | |
308 | } | |
309 |