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 scoped_guard(spinlock, &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 scoped_guard(spinlock, &midi->output_lock) {
61 if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
62 if (midi->substream_output &&
63 snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
64 ca_midi_write_data(midi, byte);
65 } else {
66 midi->interrupt_disable(midi, midi->tx_enable);
67 }
68 }
69 }
70 }
71
ca_midi_cmd(struct snd_ca_midi * midi,unsigned char cmd,int ack)72 static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack)
73 {
74 int timeout, ok;
75
76 scoped_guard(spinlock_irqsave, &midi->input_lock) {
77 ca_midi_write_data(midi, 0x00);
78 /* ca_midi_clear_rx(midi); */
79
80 ca_midi_write_cmd(midi, cmd);
81 if (ack) {
82 ok = 0;
83 timeout = 10000;
84 while (!ok && timeout-- > 0) {
85 if (ca_midi_input_avail(midi)) {
86 if (ca_midi_read_data(midi) == midi->ack)
87 ok = 1;
88 }
89 }
90 if (!ok && ca_midi_read_data(midi) == midi->ack)
91 ok = 1;
92 } else {
93 ok = 1;
94 }
95 }
96 if (!ok)
97 pr_err("ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
98 cmd,
99 midi->get_dev_id_port(midi->dev_id),
100 ca_midi_read_stat(midi),
101 ca_midi_read_data(midi));
102 }
103
ca_midi_input_open(struct snd_rawmidi_substream * substream)104 static int ca_midi_input_open(struct snd_rawmidi_substream *substream)
105 {
106 struct snd_ca_midi *midi = substream->rmidi->private_data;
107
108 if (snd_BUG_ON(!midi->dev_id))
109 return -ENXIO;
110 scoped_guard(spinlock_irqsave, &midi->open_lock) {
111 midi->midi_mode |= CA_MIDI_MODE_INPUT;
112 midi->substream_input = substream;
113 if (midi->midi_mode & CA_MIDI_MODE_OUTPUT)
114 return 0;
115 }
116 ca_midi_cmd(midi, midi->reset, 1);
117 ca_midi_cmd(midi, midi->enter_uart, 1);
118 return 0;
119 }
120
ca_midi_output_open(struct snd_rawmidi_substream * substream)121 static int ca_midi_output_open(struct snd_rawmidi_substream *substream)
122 {
123 struct snd_ca_midi *midi = substream->rmidi->private_data;
124
125 if (snd_BUG_ON(!midi->dev_id))
126 return -ENXIO;
127 scoped_guard(spinlock_irqsave, &midi->open_lock) {
128 midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
129 midi->substream_output = substream;
130 if (midi->midi_mode & CA_MIDI_MODE_INPUT)
131 return 0;
132 }
133 ca_midi_cmd(midi, midi->reset, 1);
134 ca_midi_cmd(midi, midi->enter_uart, 1);
135 return 0;
136 }
137
ca_midi_input_close(struct snd_rawmidi_substream * substream)138 static int ca_midi_input_close(struct snd_rawmidi_substream *substream)
139 {
140 struct snd_ca_midi *midi = substream->rmidi->private_data;
141
142 if (snd_BUG_ON(!midi->dev_id))
143 return -ENXIO;
144 scoped_guard(spinlock_irqsave, &midi->open_lock) {
145 midi->interrupt_disable(midi, midi->rx_enable);
146 midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
147 midi->substream_input = NULL;
148 if (midi->midi_mode & CA_MIDI_MODE_OUTPUT)
149 return 0;
150 }
151 ca_midi_cmd(midi, midi->reset, 0);
152 return 0;
153 }
154
ca_midi_output_close(struct snd_rawmidi_substream * substream)155 static int ca_midi_output_close(struct snd_rawmidi_substream *substream)
156 {
157 struct snd_ca_midi *midi = substream->rmidi->private_data;
158
159 if (snd_BUG_ON(!midi->dev_id))
160 return -ENXIO;
161
162 scoped_guard(spinlock_irqsave, &midi->open_lock) {
163 midi->interrupt_disable(midi, midi->tx_enable);
164 midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
165 midi->substream_output = NULL;
166 if (midi->midi_mode & CA_MIDI_MODE_INPUT)
167 return 0;
168 }
169 ca_midi_cmd(midi, midi->reset, 0);
170 return 0;
171 }
172
ca_midi_input_trigger(struct snd_rawmidi_substream * substream,int up)173 static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
174 {
175 struct snd_ca_midi *midi = substream->rmidi->private_data;
176
177 if (snd_BUG_ON(!midi->dev_id))
178 return;
179
180 if (up) {
181 midi->interrupt_enable(midi,midi->rx_enable);
182 } else {
183 midi->interrupt_disable(midi, midi->rx_enable);
184 }
185 }
186
ca_midi_output_trigger(struct snd_rawmidi_substream * substream,int up)187 static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
188 {
189 struct snd_ca_midi *midi = substream->rmidi->private_data;
190
191 if (snd_BUG_ON(!midi->dev_id))
192 return;
193
194 if (up) {
195 int max = 4;
196 unsigned char byte;
197
198 scoped_guard(spinlock_irqsave, &midi->output_lock) {
199
200 /* try to send some amount of bytes here before interrupts */
201 while (max > 0) {
202 if (ca_midi_output_ready(midi)) {
203 if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
204 snd_rawmidi_transmit(substream, &byte, 1) != 1) {
205 /* no more data */
206 return;
207 }
208 ca_midi_write_data(midi, byte);
209 max--;
210 } else {
211 break;
212 }
213 }
214 }
215 midi->interrupt_enable(midi,midi->tx_enable);
216
217 } else {
218 midi->interrupt_disable(midi,midi->tx_enable);
219 }
220 }
221
222 static const struct snd_rawmidi_ops ca_midi_output =
223 {
224 .open = ca_midi_output_open,
225 .close = ca_midi_output_close,
226 .trigger = ca_midi_output_trigger,
227 };
228
229 static const struct snd_rawmidi_ops ca_midi_input =
230 {
231 .open = ca_midi_input_open,
232 .close = ca_midi_input_close,
233 .trigger = ca_midi_input_trigger,
234 };
235
ca_midi_free(struct snd_ca_midi * midi)236 static void ca_midi_free(struct snd_ca_midi *midi)
237 {
238 midi->interrupt = NULL;
239 midi->interrupt_enable = NULL;
240 midi->interrupt_disable = NULL;
241 midi->read = NULL;
242 midi->write = NULL;
243 midi->get_dev_id_card = NULL;
244 midi->get_dev_id_port = NULL;
245 midi->rmidi = NULL;
246 }
247
ca_rmidi_free(struct snd_rawmidi * rmidi)248 static void ca_rmidi_free(struct snd_rawmidi *rmidi)
249 {
250 ca_midi_free(rmidi->private_data);
251 }
252
ca_midi_init(void * dev_id,struct snd_ca_midi * midi,int device,char * name)253 int ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
254 {
255 struct snd_rawmidi *rmidi;
256 int err;
257
258 err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi);
259 if (err < 0)
260 return err;
261
262 midi->dev_id = dev_id;
263 midi->interrupt = ca_midi_interrupt;
264
265 spin_lock_init(&midi->open_lock);
266 spin_lock_init(&midi->input_lock);
267 spin_lock_init(&midi->output_lock);
268
269 strscpy(rmidi->name, name);
270 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
271 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
272 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
273 SNDRV_RAWMIDI_INFO_INPUT |
274 SNDRV_RAWMIDI_INFO_DUPLEX;
275 rmidi->private_data = midi;
276 rmidi->private_free = ca_rmidi_free;
277
278 midi->rmidi = rmidi;
279 return 0;
280 }
281
282