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1da177e4 LT |
1 | /* |
2 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
3 | * Routines for control of MPU-401 in UART mode | |
4 | * | |
5 | * MPU-401 supports UART mode which is not capable generate transmit | |
6 | * interrupts thus output is done via polling. Also, if irq < 0, then | |
7 | * input is done also via polling. Do not expect good performance. | |
8 | * | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * 13-03-2003: | |
25 | * Added support for different kind of hardware I/O. Build in choices | |
26 | * are port and mmio. For other kind of I/O, set mpu->read and | |
27 | * mpu->write to your own I/O functions. | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <sound/driver.h> | |
32 | #include <asm/io.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <linux/errno.h> | |
39 | #include <sound/core.h> | |
40 | #include <sound/mpu401.h> | |
41 | ||
42 | MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>"); | |
43 | MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode"); | |
44 | MODULE_LICENSE("GPL"); | |
45 | ||
46 | static void snd_mpu401_uart_input_read(mpu401_t * mpu); | |
47 | static void snd_mpu401_uart_output_write(mpu401_t * mpu); | |
48 | ||
49 | /* | |
50 | ||
51 | */ | |
52 | ||
53 | #define snd_mpu401_input_avail(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x80)) | |
54 | #define snd_mpu401_output_ready(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x40)) | |
55 | ||
56 | #define MPU401_RESET 0xff | |
57 | #define MPU401_ENTER_UART 0x3f | |
58 | #define MPU401_ACK 0xfe | |
59 | ||
60 | /* Build in lowlevel io */ | |
61 | static void mpu401_write_port(mpu401_t *mpu, unsigned char data, unsigned long addr) | |
62 | { | |
63 | outb(data, addr); | |
64 | } | |
65 | ||
66 | static unsigned char mpu401_read_port(mpu401_t *mpu, unsigned long addr) | |
67 | { | |
68 | return inb(addr); | |
69 | } | |
70 | ||
71 | static void mpu401_write_mmio(mpu401_t *mpu, unsigned char data, unsigned long addr) | |
72 | { | |
73 | writeb(data, (void __iomem *)addr); | |
74 | } | |
75 | ||
76 | static unsigned char mpu401_read_mmio(mpu401_t *mpu, unsigned long addr) | |
77 | { | |
78 | return readb((void __iomem *)addr); | |
79 | } | |
80 | /* */ | |
81 | ||
82 | static void snd_mpu401_uart_clear_rx(mpu401_t *mpu) | |
83 | { | |
84 | int timeout = 100000; | |
85 | for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--) | |
86 | mpu->read(mpu, MPU401D(mpu)); | |
87 | #ifdef CONFIG_SND_DEBUG | |
88 | if (timeout <= 0) | |
89 | snd_printk("cmd: clear rx timeout (status = 0x%x)\n", mpu->read(mpu, MPU401C(mpu))); | |
90 | #endif | |
91 | } | |
92 | ||
93 | static void _snd_mpu401_uart_interrupt(mpu401_t *mpu) | |
94 | { | |
95 | spin_lock(&mpu->input_lock); | |
96 | if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) { | |
97 | snd_mpu401_uart_input_read(mpu); | |
98 | } else { | |
99 | snd_mpu401_uart_clear_rx(mpu); | |
100 | } | |
101 | spin_unlock(&mpu->input_lock); | |
102 | /* ok. for better Tx performance try do some output when input is done */ | |
103 | if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) && | |
104 | test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) { | |
105 | spin_lock(&mpu->output_lock); | |
106 | snd_mpu401_uart_output_write(mpu); | |
107 | spin_unlock(&mpu->output_lock); | |
108 | } | |
109 | } | |
110 | ||
111 | /** | |
112 | * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler | |
113 | * @irq: the irq number | |
114 | * @dev_id: mpu401 instance | |
115 | * @regs: the reigster | |
116 | * | |
117 | * Processes the interrupt for MPU401-UART i/o. | |
118 | */ | |
119 | irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
120 | { | |
121 | mpu401_t *mpu = dev_id; | |
122 | ||
123 | if (mpu == NULL) | |
124 | return IRQ_NONE; | |
125 | _snd_mpu401_uart_interrupt(mpu); | |
126 | return IRQ_HANDLED; | |
127 | } | |
128 | ||
129 | /* | |
130 | * timer callback | |
131 | * reprogram the timer and call the interrupt job | |
132 | */ | |
133 | static void snd_mpu401_uart_timer(unsigned long data) | |
134 | { | |
135 | mpu401_t *mpu = (mpu401_t *)data; | |
136 | ||
137 | spin_lock(&mpu->timer_lock); | |
138 | /*mpu->mode |= MPU401_MODE_TIMER;*/ | |
139 | mpu->timer.expires = 1 + jiffies; | |
140 | add_timer(&mpu->timer); | |
141 | spin_unlock(&mpu->timer_lock); | |
142 | if (mpu->rmidi) | |
143 | _snd_mpu401_uart_interrupt(mpu); | |
144 | } | |
145 | ||
146 | /* | |
147 | * initialize the timer callback if not programmed yet | |
148 | */ | |
149 | static void snd_mpu401_uart_add_timer (mpu401_t *mpu, int input) | |
150 | { | |
151 | unsigned long flags; | |
152 | ||
153 | spin_lock_irqsave (&mpu->timer_lock, flags); | |
154 | if (mpu->timer_invoked == 0) { | |
155 | init_timer(&mpu->timer); | |
156 | mpu->timer.data = (unsigned long)mpu; | |
157 | mpu->timer.function = snd_mpu401_uart_timer; | |
158 | mpu->timer.expires = 1 + jiffies; | |
159 | add_timer(&mpu->timer); | |
160 | } | |
161 | mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER : MPU401_MODE_OUTPUT_TIMER; | |
162 | spin_unlock_irqrestore (&mpu->timer_lock, flags); | |
163 | } | |
164 | ||
165 | /* | |
166 | * remove the timer callback if still active | |
167 | */ | |
168 | static void snd_mpu401_uart_remove_timer (mpu401_t *mpu, int input) | |
169 | { | |
170 | unsigned long flags; | |
171 | ||
172 | spin_lock_irqsave (&mpu->timer_lock, flags); | |
173 | if (mpu->timer_invoked) { | |
174 | mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER : ~MPU401_MODE_OUTPUT_TIMER; | |
175 | if (! mpu->timer_invoked) | |
176 | del_timer(&mpu->timer); | |
177 | } | |
178 | spin_unlock_irqrestore (&mpu->timer_lock, flags); | |
179 | } | |
180 | ||
181 | /* | |
182 | ||
183 | */ | |
184 | ||
185 | static void snd_mpu401_uart_cmd(mpu401_t * mpu, unsigned char cmd, int ack) | |
186 | { | |
187 | unsigned long flags; | |
188 | int timeout, ok; | |
189 | ||
190 | spin_lock_irqsave(&mpu->input_lock, flags); | |
191 | if (mpu->hardware != MPU401_HW_TRID4DWAVE) { | |
192 | mpu->write(mpu, 0x00, MPU401D(mpu)); | |
193 | /*snd_mpu401_uart_clear_rx(mpu);*/ | |
194 | } | |
195 | /* ok. standard MPU-401 initialization */ | |
196 | if (mpu->hardware != MPU401_HW_SB) { | |
197 | for (timeout = 1000; timeout > 0 && !snd_mpu401_output_ready(mpu); timeout--) | |
198 | udelay(10); | |
199 | #ifdef CONFIG_SND_DEBUG | |
200 | if (!timeout) | |
201 | snd_printk("cmd: tx timeout (status = 0x%x)\n", mpu->read(mpu, MPU401C(mpu))); | |
202 | #endif | |
203 | } | |
204 | mpu->write(mpu, cmd, MPU401C(mpu)); | |
205 | if (ack) { | |
206 | ok = 0; | |
207 | timeout = 10000; | |
208 | while (!ok && timeout-- > 0) { | |
209 | if (snd_mpu401_input_avail(mpu)) { | |
210 | if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) | |
211 | ok = 1; | |
212 | } | |
213 | } | |
214 | if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) | |
215 | ok = 1; | |
216 | } else { | |
217 | ok = 1; | |
218 | } | |
219 | spin_unlock_irqrestore(&mpu->input_lock, flags); | |
220 | if (! ok) | |
221 | snd_printk("cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)\n", cmd, mpu->port, mpu->read(mpu, MPU401C(mpu)), mpu->read(mpu, MPU401D(mpu))); | |
222 | // snd_printk("cmd: 0x%x at 0x%lx (status = 0x%x, data = 0x%x)\n", cmd, mpu->port, mpu->read(mpu, MPU401C(mpu)), mpu->read(mpu, MPU401D(mpu))); | |
223 | } | |
224 | ||
225 | /* | |
226 | * input/output open/close - protected by open_mutex in rawmidi.c | |
227 | */ | |
228 | static int snd_mpu401_uart_input_open(snd_rawmidi_substream_t * substream) | |
229 | { | |
230 | mpu401_t *mpu; | |
231 | int err; | |
232 | ||
233 | mpu = substream->rmidi->private_data; | |
234 | if (mpu->open_input && (err = mpu->open_input(mpu)) < 0) | |
235 | return err; | |
236 | if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) { | |
237 | snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1); | |
238 | snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1); | |
239 | } | |
240 | mpu->substream_input = substream; | |
241 | set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int snd_mpu401_uart_output_open(snd_rawmidi_substream_t * substream) | |
246 | { | |
247 | mpu401_t *mpu; | |
248 | int err; | |
249 | ||
250 | mpu = substream->rmidi->private_data; | |
251 | if (mpu->open_output && (err = mpu->open_output(mpu)) < 0) | |
252 | return err; | |
253 | if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) { | |
254 | snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1); | |
255 | snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1); | |
256 | } | |
257 | mpu->substream_output = substream; | |
258 | set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int snd_mpu401_uart_input_close(snd_rawmidi_substream_t * substream) | |
263 | { | |
264 | mpu401_t *mpu; | |
265 | ||
266 | mpu = substream->rmidi->private_data; | |
267 | clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); | |
268 | mpu->substream_input = NULL; | |
269 | if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) | |
270 | snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); | |
271 | if (mpu->close_input) | |
272 | mpu->close_input(mpu); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static int snd_mpu401_uart_output_close(snd_rawmidi_substream_t * substream) | |
277 | { | |
278 | mpu401_t *mpu; | |
279 | ||
280 | mpu = substream->rmidi->private_data; | |
281 | clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); | |
282 | mpu->substream_output = NULL; | |
283 | if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) | |
284 | snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); | |
285 | if (mpu->close_output) | |
286 | mpu->close_output(mpu); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | /* | |
291 | * trigger input callback | |
292 | */ | |
293 | static void snd_mpu401_uart_input_trigger(snd_rawmidi_substream_t * substream, int up) | |
294 | { | |
295 | unsigned long flags; | |
296 | mpu401_t *mpu; | |
297 | int max = 64; | |
298 | ||
299 | mpu = substream->rmidi->private_data; | |
300 | if (up) { | |
301 | if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) { | |
302 | /* first time - flush FIFO */ | |
303 | while (max-- > 0) | |
304 | mpu->read(mpu, MPU401D(mpu)); | |
305 | if (mpu->irq < 0) | |
306 | snd_mpu401_uart_add_timer(mpu, 1); | |
307 | } | |
308 | ||
309 | /* read data in advance */ | |
310 | spin_lock_irqsave(&mpu->input_lock, flags); | |
311 | snd_mpu401_uart_input_read(mpu); | |
312 | spin_unlock_irqrestore(&mpu->input_lock, flags); | |
313 | } else { | |
314 | if (mpu->irq < 0) | |
315 | snd_mpu401_uart_remove_timer(mpu, 1); | |
316 | clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode); | |
317 | } | |
318 | } | |
319 | ||
320 | /* | |
321 | * transfer input pending data | |
322 | * call with input_lock spinlock held | |
323 | */ | |
324 | static void snd_mpu401_uart_input_read(mpu401_t * mpu) | |
325 | { | |
326 | int max = 128; | |
327 | unsigned char byte; | |
328 | ||
329 | while (max-- > 0) { | |
330 | if (snd_mpu401_input_avail(mpu)) { | |
331 | byte = mpu->read(mpu, MPU401D(mpu)); | |
332 | if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) | |
333 | snd_rawmidi_receive(mpu->substream_input, &byte, 1); | |
334 | } else { | |
335 | break; /* input not available */ | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | * Tx FIFO sizes: | |
342 | * CS4237B - 16 bytes | |
343 | * AudioDrive ES1688 - 12 bytes | |
344 | * S3 SonicVibes - 8 bytes | |
345 | * SoundBlaster AWE 64 - 2 bytes (ugly hardware) | |
346 | */ | |
347 | ||
348 | /* | |
349 | * write output pending bytes | |
350 | * call with output_lock spinlock held | |
351 | */ | |
352 | static void snd_mpu401_uart_output_write(mpu401_t * mpu) | |
353 | { | |
354 | unsigned char byte; | |
355 | int max = 256, timeout; | |
356 | ||
357 | do { | |
358 | if (snd_rawmidi_transmit_peek(mpu->substream_output, &byte, 1) == 1) { | |
359 | for (timeout = 100; timeout > 0; timeout--) { | |
360 | if (snd_mpu401_output_ready(mpu)) { | |
361 | mpu->write(mpu, byte, MPU401D(mpu)); | |
362 | snd_rawmidi_transmit_ack(mpu->substream_output, 1); | |
363 | break; | |
364 | } | |
365 | } | |
366 | if (timeout == 0) | |
367 | break; /* Tx FIFO full - try again later */ | |
368 | } else { | |
369 | snd_mpu401_uart_remove_timer (mpu, 0); | |
370 | break; /* no other data - leave the tx loop */ | |
371 | } | |
372 | } while (--max > 0); | |
373 | } | |
374 | ||
375 | /* | |
376 | * output trigger callback | |
377 | */ | |
378 | static void snd_mpu401_uart_output_trigger(snd_rawmidi_substream_t * substream, int up) | |
379 | { | |
380 | unsigned long flags; | |
381 | mpu401_t *mpu; | |
382 | ||
383 | mpu = substream->rmidi->private_data; | |
384 | if (up) { | |
385 | set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); | |
386 | ||
387 | /* try to add the timer at each output trigger, | |
388 | * since the output timer might have been removed in | |
389 | * snd_mpu401_uart_output_write(). | |
390 | */ | |
391 | snd_mpu401_uart_add_timer(mpu, 0); | |
392 | ||
393 | /* output pending data */ | |
394 | spin_lock_irqsave(&mpu->output_lock, flags); | |
395 | snd_mpu401_uart_output_write(mpu); | |
396 | spin_unlock_irqrestore(&mpu->output_lock, flags); | |
397 | } else { | |
398 | snd_mpu401_uart_remove_timer(mpu, 0); | |
399 | clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); | |
400 | } | |
401 | } | |
402 | ||
403 | /* | |
404 | ||
405 | */ | |
406 | ||
407 | static snd_rawmidi_ops_t snd_mpu401_uart_output = | |
408 | { | |
409 | .open = snd_mpu401_uart_output_open, | |
410 | .close = snd_mpu401_uart_output_close, | |
411 | .trigger = snd_mpu401_uart_output_trigger, | |
412 | }; | |
413 | ||
414 | static snd_rawmidi_ops_t snd_mpu401_uart_input = | |
415 | { | |
416 | .open = snd_mpu401_uart_input_open, | |
417 | .close = snd_mpu401_uart_input_close, | |
418 | .trigger = snd_mpu401_uart_input_trigger, | |
419 | }; | |
420 | ||
421 | static void snd_mpu401_uart_free(snd_rawmidi_t *rmidi) | |
422 | { | |
423 | mpu401_t *mpu = rmidi->private_data; | |
424 | if (mpu->irq_flags && mpu->irq >= 0) | |
425 | free_irq(mpu->irq, (void *) mpu); | |
b1d5776d | 426 | release_and_free_resource(mpu->res); |
1da177e4 LT |
427 | kfree(mpu); |
428 | } | |
429 | ||
430 | /** | |
431 | * snd_mpu401_uart_new - create an MPU401-UART instance | |
432 | * @card: the card instance | |
433 | * @device: the device index, zero-based | |
434 | * @hardware: the hardware type, MPU401_HW_XXXX | |
435 | * @port: the base address of MPU401 port | |
436 | * @integrated: non-zero if the port was already reserved by the chip | |
437 | * @irq: the irq number, -1 if no interrupt for mpu | |
438 | * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved. | |
439 | * @rrawmidi: the pointer to store the new rawmidi instance | |
440 | * | |
441 | * Creates a new MPU-401 instance. | |
442 | * | |
443 | * Note that the rawmidi instance is returned on the rrawmidi argument, | |
444 | * not the mpu401 instance itself. To access to the mpu401 instance, | |
445 | * cast from rawmidi->private_data (with mpu401_t magic-cast). | |
446 | * | |
447 | * Returns zero if successful, or a negative error code. | |
448 | */ | |
449 | int snd_mpu401_uart_new(snd_card_t * card, int device, | |
450 | unsigned short hardware, | |
451 | unsigned long port, int integrated, | |
452 | int irq, int irq_flags, | |
453 | snd_rawmidi_t ** rrawmidi) | |
454 | { | |
455 | mpu401_t *mpu; | |
456 | snd_rawmidi_t *rmidi; | |
457 | int err; | |
458 | ||
459 | if (rrawmidi) | |
460 | *rrawmidi = NULL; | |
461 | if ((err = snd_rawmidi_new(card, "MPU-401U", device, 1, 1, &rmidi)) < 0) | |
462 | return err; | |
561b220a | 463 | mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); |
1da177e4 LT |
464 | if (mpu == NULL) { |
465 | snd_device_free(card, rmidi); | |
466 | return -ENOMEM; | |
467 | } | |
468 | rmidi->private_data = mpu; | |
469 | rmidi->private_free = snd_mpu401_uart_free; | |
470 | spin_lock_init(&mpu->input_lock); | |
471 | spin_lock_init(&mpu->output_lock); | |
472 | spin_lock_init(&mpu->timer_lock); | |
473 | mpu->hardware = hardware; | |
474 | if (!integrated) { | |
475 | int res_size = hardware == MPU401_HW_PC98II ? 4 : 2; | |
476 | if ((mpu->res = request_region(port, res_size, "MPU401 UART")) == NULL) { | |
477 | snd_printk(KERN_ERR "mpu401_uart: unable to grab port 0x%lx size %d\n", port, res_size); | |
478 | snd_device_free(card, rmidi); | |
479 | return -EBUSY; | |
480 | } | |
481 | } | |
482 | switch (hardware) { | |
483 | case MPU401_HW_AUREAL: | |
484 | mpu->write = mpu401_write_mmio; | |
485 | mpu->read = mpu401_read_mmio; | |
486 | break; | |
487 | default: | |
488 | mpu->write = mpu401_write_port; | |
489 | mpu->read = mpu401_read_port; | |
490 | break; | |
491 | } | |
492 | mpu->port = port; | |
493 | if (hardware == MPU401_HW_PC98II) | |
494 | mpu->cport = port + 2; | |
495 | else | |
496 | mpu->cport = port + 1; | |
497 | if (irq >= 0 && irq_flags) { | |
498 | if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags, "MPU401 UART", (void *) mpu)) { | |
499 | snd_printk(KERN_ERR "mpu401_uart: unable to grab IRQ %d\n", irq); | |
500 | snd_device_free(card, rmidi); | |
501 | return -EBUSY; | |
502 | } | |
503 | } | |
504 | mpu->irq = irq; | |
505 | mpu->irq_flags = irq_flags; | |
506 | if (card->shortname[0]) | |
507 | snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI", card->shortname); | |
508 | else | |
509 | sprintf(rmidi->name, "MPU-401 MIDI %d-%d", card->number, device); | |
510 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_mpu401_uart_output); | |
511 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_mpu401_uart_input); | |
512 | rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | | |
513 | SNDRV_RAWMIDI_INFO_INPUT | | |
514 | SNDRV_RAWMIDI_INFO_DUPLEX; | |
515 | mpu->rmidi = rmidi; | |
516 | if (rrawmidi) | |
517 | *rrawmidi = rmidi; | |
518 | return 0; | |
519 | } | |
520 | ||
521 | EXPORT_SYMBOL(snd_mpu401_uart_interrupt); | |
522 | EXPORT_SYMBOL(snd_mpu401_uart_new); | |
523 | ||
524 | /* | |
525 | * INIT part | |
526 | */ | |
527 | ||
528 | static int __init alsa_mpu401_uart_init(void) | |
529 | { | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static void __exit alsa_mpu401_uart_exit(void) | |
534 | { | |
535 | } | |
536 | ||
537 | module_init(alsa_mpu401_uart_init) | |
538 | module_exit(alsa_mpu401_uart_exit) |