1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
4 * Creative Audio MIDI, for the CA0106 Driver
5 * Version: 0.0.1
6 *
7 * Changelog:
8 * Implementation is based on mpu401 and emu10k1x and
9 * tested with ca0106.
10 * mpu401: Copyright (c) by Jaroslav Kysela <perex@perex.cz>
11 * emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
12 */
13
14 #include <linux/spinlock.h>
15 #include <sound/core.h>
16 #include <sound/rawmidi.h>
17
18 #include "ca_midi.h"
19
20 #define ca_midi_write_data(midi, data) midi->write(midi, data, 0)
21 #define ca_midi_write_cmd(midi, data) midi->write(midi, data, 1)
22 #define ca_midi_read_data(midi) midi->read(midi, 0)
23 #define ca_midi_read_stat(midi) midi->read(midi, 1)
24 #define ca_midi_input_avail(midi) (!(ca_midi_read_stat(midi) & midi->input_avail))
25 #define ca_midi_output_ready(midi) (!(ca_midi_read_stat(midi) & midi->output_ready))
26
ca_midi_clear_rx(struct snd_ca_midi * midi)27 static void ca_midi_clear_rx(struct snd_ca_midi *midi)
28 {
29 int timeout = 100000;
30 for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
31 ca_midi_read_data(midi);
32 #ifdef CONFIG_SND_DEBUG
33 if (timeout <= 0)
34 pr_err("ca_midi_clear_rx: timeout (status = 0x%x)\n",
35 ca_midi_read_stat(midi));
36 #endif
37 }
38
ca_midi_interrupt(struct snd_ca_midi * midi,unsigned int status)39 static void ca_midi_interrupt(struct snd_ca_midi *midi, unsigned int status)
40 {
41 unsigned char byte;
42
43 if (midi->rmidi == NULL) {
44 midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable);
45 return;
46 }
47
48 spin_lock(&midi->input_lock);
49 if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
50 if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
51 ca_midi_clear_rx(midi);
52 } else {
53 byte = ca_midi_read_data(midi);
54 if(midi->substream_input)
55 snd_rawmidi_receive(midi->substream_input, &byte, 1);
56
57
58 }
59 }
60 spin_unlock(&midi->input_lock);
61
62 spin_lock(&midi->output_lock);
63 if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
64 if (midi->substream_output &&
65 snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
66 ca_midi_write_data(midi, byte);
67 } else {
68 midi->interrupt_disable(midi,midi->tx_enable);
69 }
70 }
71 spin_unlock(&midi->output_lock);
72
73 }
74
ca_midi_cmd(struct snd_ca_midi * midi,unsigned char cmd,int ack)75 static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack)
76 {
77 unsigned long flags;
78 int timeout, ok;
79
80 spin_lock_irqsave(&midi->input_lock, flags);
81 ca_midi_write_data(midi, 0x00);
82 /* ca_midi_clear_rx(midi); */
83
84 ca_midi_write_cmd(midi, cmd);
85 if (ack) {
86 ok = 0;
87 timeout = 10000;
88 while (!ok && timeout-- > 0) {
89 if (ca_midi_input_avail(midi)) {
90 if (ca_midi_read_data(midi) == midi->ack)
91 ok = 1;
92 }
93 }
94 if (!ok && ca_midi_read_data(midi) == midi->ack)
95 ok = 1;
96 } else {
97 ok = 1;
98 }
99 spin_unlock_irqrestore(&midi->input_lock, flags);
100 if (!ok)
101 pr_err("ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
102 cmd,
103 midi->get_dev_id_port(midi->dev_id),
104 ca_midi_read_stat(midi),
105 ca_midi_read_data(midi));
106 }
107
ca_midi_input_open(struct snd_rawmidi_substream * substream)108 static int ca_midi_input_open(struct snd_rawmidi_substream *substream)
109 {
110 struct snd_ca_midi *midi = substream->rmidi->private_data;
111 unsigned long flags;
112
113 if (snd_BUG_ON(!midi->dev_id))
114 return -ENXIO;
115 spin_lock_irqsave(&midi->open_lock, flags);
116 midi->midi_mode |= CA_MIDI_MODE_INPUT;
117 midi->substream_input = substream;
118 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
119 spin_unlock_irqrestore(&midi->open_lock, flags);
120 ca_midi_cmd(midi, midi->reset, 1);
121 ca_midi_cmd(midi, midi->enter_uart, 1);
122 } else {
123 spin_unlock_irqrestore(&midi->open_lock, flags);
124 }
125 return 0;
126 }
127
ca_midi_output_open(struct snd_rawmidi_substream * substream)128 static int ca_midi_output_open(struct snd_rawmidi_substream *substream)
129 {
130 struct snd_ca_midi *midi = substream->rmidi->private_data;
131 unsigned long flags;
132
133 if (snd_BUG_ON(!midi->dev_id))
134 return -ENXIO;
135 spin_lock_irqsave(&midi->open_lock, flags);
136 midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
137 midi->substream_output = substream;
138 if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
139 spin_unlock_irqrestore(&midi->open_lock, flags);
140 ca_midi_cmd(midi, midi->reset, 1);
141 ca_midi_cmd(midi, midi->enter_uart, 1);
142 } else {
143 spin_unlock_irqrestore(&midi->open_lock, flags);
144 }
145 return 0;
146 }
147
ca_midi_input_close(struct snd_rawmidi_substream * substream)148 static int ca_midi_input_close(struct snd_rawmidi_substream *substream)
149 {
150 struct snd_ca_midi *midi = substream->rmidi->private_data;
151 unsigned long flags;
152
153 if (snd_BUG_ON(!midi->dev_id))
154 return -ENXIO;
155 spin_lock_irqsave(&midi->open_lock, flags);
156 midi->interrupt_disable(midi,midi->rx_enable);
157 midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
158 midi->substream_input = NULL;
159 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
160 spin_unlock_irqrestore(&midi->open_lock, flags);
161 ca_midi_cmd(midi, midi->reset, 0);
162 } else {
163 spin_unlock_irqrestore(&midi->open_lock, flags);
164 }
165 return 0;
166 }
167
ca_midi_output_close(struct snd_rawmidi_substream * substream)168 static int ca_midi_output_close(struct snd_rawmidi_substream *substream)
169 {
170 struct snd_ca_midi *midi = substream->rmidi->private_data;
171 unsigned long flags;
172
173 if (snd_BUG_ON(!midi->dev_id))
174 return -ENXIO;
175
176 spin_lock_irqsave(&midi->open_lock, flags);
177
178 midi->interrupt_disable(midi,midi->tx_enable);
179 midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
180 midi->substream_output = NULL;
181
182 if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
183 spin_unlock_irqrestore(&midi->open_lock, flags);
184 ca_midi_cmd(midi, midi->reset, 0);
185 } else {
186 spin_unlock_irqrestore(&midi->open_lock, flags);
187 }
188 return 0;
189 }
190
ca_midi_input_trigger(struct snd_rawmidi_substream * substream,int up)191 static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
192 {
193 struct snd_ca_midi *midi = substream->rmidi->private_data;
194
195 if (snd_BUG_ON(!midi->dev_id))
196 return;
197
198 if (up) {
199 midi->interrupt_enable(midi,midi->rx_enable);
200 } else {
201 midi->interrupt_disable(midi, midi->rx_enable);
202 }
203 }
204
ca_midi_output_trigger(struct snd_rawmidi_substream * substream,int up)205 static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
206 {
207 struct snd_ca_midi *midi = substream->rmidi->private_data;
208 unsigned long flags;
209
210 if (snd_BUG_ON(!midi->dev_id))
211 return;
212
213 if (up) {
214 int max = 4;
215 unsigned char byte;
216
217 spin_lock_irqsave(&midi->output_lock, flags);
218
219 /* try to send some amount of bytes here before interrupts */
220 while (max > 0) {
221 if (ca_midi_output_ready(midi)) {
222 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
223 snd_rawmidi_transmit(substream, &byte, 1) != 1) {
224 /* no more data */
225 spin_unlock_irqrestore(&midi->output_lock, flags);
226 return;
227 }
228 ca_midi_write_data(midi, byte);
229 max--;
230 } else {
231 break;
232 }
233 }
234
235 spin_unlock_irqrestore(&midi->output_lock, flags);
236 midi->interrupt_enable(midi,midi->tx_enable);
237
238 } else {
239 midi->interrupt_disable(midi,midi->tx_enable);
240 }
241 }
242
243 static const struct snd_rawmidi_ops ca_midi_output =
244 {
245 .open = ca_midi_output_open,
246 .close = ca_midi_output_close,
247 .trigger = ca_midi_output_trigger,
248 };
249
250 static const struct snd_rawmidi_ops ca_midi_input =
251 {
252 .open = ca_midi_input_open,
253 .close = ca_midi_input_close,
254 .trigger = ca_midi_input_trigger,
255 };
256
ca_midi_free(struct snd_ca_midi * midi)257 static void ca_midi_free(struct snd_ca_midi *midi)
258 {
259 midi->interrupt = NULL;
260 midi->interrupt_enable = NULL;
261 midi->interrupt_disable = NULL;
262 midi->read = NULL;
263 midi->write = NULL;
264 midi->get_dev_id_card = NULL;
265 midi->get_dev_id_port = NULL;
266 midi->rmidi = NULL;
267 }
268
ca_rmidi_free(struct snd_rawmidi * rmidi)269 static void ca_rmidi_free(struct snd_rawmidi *rmidi)
270 {
271 ca_midi_free(rmidi->private_data);
272 }
273
ca_midi_init(void * dev_id,struct snd_ca_midi * midi,int device,char * name)274 int ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
275 {
276 struct snd_rawmidi *rmidi;
277 int err;
278
279 err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi);
280 if (err < 0)
281 return err;
282
283 midi->dev_id = dev_id;
284 midi->interrupt = ca_midi_interrupt;
285
286 spin_lock_init(&midi->open_lock);
287 spin_lock_init(&midi->input_lock);
288 spin_lock_init(&midi->output_lock);
289
290 strcpy(rmidi->name, name);
291 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
292 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
293 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
294 SNDRV_RAWMIDI_INFO_INPUT |
295 SNDRV_RAWMIDI_INFO_DUPLEX;
296 rmidi->private_data = midi;
297 rmidi->private_free = ca_rmidi_free;
298
299 midi->rmidi = rmidi;
300 return 0;
301 }
302
303