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Linux 4.16.11
[linux/fpc-iii.git] / sound / drivers / serial-u16550.c
blob0a67b8b9f176e3f9b7908e62f66c0720d6c642e1
1 /*
2 * serial.c
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
4 * Isaku Yamahata <yamahata@private.email.ne.jp>,
5 * George Hansper <ghansper@apana.org.au>,
6 * Hannu Savolainen
7 *
8 * This code is based on the code from ALSA 0.5.9, but heavily rewritten.
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 * Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com
25 * Added support for the Midiator MS-124T and for the MS-124W in
26 * Single Addressed (S/A) or Multiple Burst (M/B) mode, with
27 * power derived either parasitically from the serial port or
28 * from a separate power supply.
29 *
30 * More documentation can be found in serial-u16550.txt.
31 */
32
33 #include <linux/init.h>
34 #include <linux/interrupt.h>
35 #include <linux/err.h>
36 #include <linux/platform_device.h>
37 #include <linux/slab.h>
38 #include <linux/ioport.h>
39 #include <linux/module.h>
40 #include <linux/io.h>
41 #include <sound/core.h>
42 #include <sound/rawmidi.h>
43 #include <sound/initval.h>
44
45 #include <linux/serial_reg.h>
46 #include <linux/jiffies.h>
47
48 MODULE_DESCRIPTION("MIDI serial u16550");
49 MODULE_LICENSE("GPL");
50 MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
51
52 #define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
53 #define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
54 #define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
55 #define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
56 #define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
57 #define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
58 static char *adaptor_names[] = {
59 "Soundcanvas",
60 "MS-124T",
61 "MS-124W S/A",
62 "MS-124W M/B",
63 "Generic"
64 };
65
66 #define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
67 #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
68
69 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
70 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
71 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
72 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
73 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
74 static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
75 static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
76 static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
77 static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
78 static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
79 static bool droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
80
81 module_param_array(index, int, NULL, 0444);
82 MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
83 module_param_array(id, charp, NULL, 0444);
84 MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
85 module_param_array(enable, bool, NULL, 0444);
86 MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
87 module_param_hw_array(port, long, ioport, NULL, 0444);
88 MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
89 module_param_hw_array(irq, int, irq, NULL, 0444);
90 MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
91 module_param_array(speed, int, NULL, 0444);
92 MODULE_PARM_DESC(speed, "Speed in bauds.");
93 module_param_array(base, int, NULL, 0444);
94 MODULE_PARM_DESC(base, "Base for divisor in bauds.");
95 module_param_array(outs, int, NULL, 0444);
96 MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
97 module_param_array(ins, int, NULL, 0444);
98 MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
99 module_param_array(droponfull, bool, NULL, 0444);
100 MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
101
102 module_param_array(adaptor, int, NULL, 0444);
103 MODULE_PARM_DESC(adaptor, "Type of adaptor.");
104
105 /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
106
107 #define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
108 #define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
109
110 #define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
111 #define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
112
113 #define SERIAL_MODE_NOT_OPENED (0)
114 #define SERIAL_MODE_INPUT_OPEN (1 << 0)
115 #define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
116 #define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
117 #define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
118
119 struct snd_uart16550 {
120 struct snd_card *card;
121 struct snd_rawmidi *rmidi;
122 struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS];
123 struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS];
124
125 int filemode; /* open status of file */
126
127 spinlock_t open_lock;
128
129 int irq;
130
131 unsigned long base;
132 struct resource *res_base;
133
134 unsigned int speed;
135 unsigned int speed_base;
136 unsigned char divisor;
137
138 unsigned char old_divisor_lsb;
139 unsigned char old_divisor_msb;
140 unsigned char old_line_ctrl_reg;
141
142 /* parameter for using of write loop */
143 short int fifo_limit; /* used in uart16550 */
144 short int fifo_count; /* used in uart16550 */
145
146 /* type of adaptor */
147 int adaptor;
148
149 /* inputs */
150 int prev_in;
151 unsigned char rstatus;
152
153 /* outputs */
154 int prev_out;
155 unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
156
157 /* write buffer and its writing/reading position */
158 unsigned char tx_buff[TX_BUFF_SIZE];
159 int buff_in_count;
160 int buff_in;
161 int buff_out;
162 int drop_on_full;
163
164 /* wait timer */
165 unsigned int timer_running:1;
166 struct timer_list buffer_timer;
167
168 };
169
170 static struct platform_device *devices[SNDRV_CARDS];
171
172 static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart)
173 {
174 if (!uart->timer_running) {
175 /* timer 38600bps * 10bit * 16byte */
176 mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256);
177 uart->timer_running = 1;
178 }
179 }
180
181 static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart)
182 {
183 if (uart->timer_running) {
184 del_timer(&uart->buffer_timer);
185 uart->timer_running = 0;
186 }
187 }
188
189 /* This macro is only used in snd_uart16550_io_loop */
190 static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart)
191 {
192 unsigned short buff_out = uart->buff_out;
193 if (uart->buff_in_count > 0) {
194 outb(uart->tx_buff[buff_out], uart->base + UART_TX);
195 uart->fifo_count++;
196 buff_out++;
197 buff_out &= TX_BUFF_MASK;
198 uart->buff_out = buff_out;
199 uart->buff_in_count--;
200 }
201 }
202
203 /* This loop should be called with interrupts disabled
204 * We don't want to interrupt this,
205 * as we're already handling an interrupt
206 */
207 static void snd_uart16550_io_loop(struct snd_uart16550 * uart)
208 {
209 unsigned char c, status;
210 int substream;
211
212 /* recall previous stream */
213 substream = uart->prev_in;
214
215 /* Read Loop */
216 while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
217 /* while receive data ready */
218 c = inb(uart->base + UART_RX);
219
220 /* keep track of last status byte */
221 if (c & 0x80)
222 uart->rstatus = c;
223
224 /* handle stream switch */
225 if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
226 if (uart->rstatus == 0xf5) {
227 if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
228 substream = c - 1;
229 if (c != 0xf5)
230 /* prevent future bytes from being
231 interpreted as streams */
232 uart->rstatus = 0;
233 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
234 && uart->midi_input[substream])
235 snd_rawmidi_receive(uart->midi_input[substream],
236 &c, 1);
237 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
238 uart->midi_input[substream])
239 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
240
241 if (status & UART_LSR_OE)
242 snd_printk(KERN_WARNING
243 "%s: Overrun on device at 0x%lx\n",
244 uart->rmidi->name, uart->base);
245 }
246
247 /* remember the last stream */
248 uart->prev_in = substream;
249
250 /* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
251 buffer is never filled. */
252 /* Check write status */
253 if (status & UART_LSR_THRE)
254 uart->fifo_count = 0;
255 if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
256 || uart->adaptor == SNDRV_SERIAL_GENERIC) {
257 /* Can't use FIFO, must send only when CTS is true */
258 status = inb(uart->base + UART_MSR);
259 while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
260 uart->buff_in_count > 0) {
261 snd_uart16550_buffer_output(uart);
262 status = inb(uart->base + UART_MSR);
263 }
264 } else {
265 /* Write loop */
266 while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
267 && uart->buff_in_count > 0) /* Do we want to? */
268 snd_uart16550_buffer_output(uart);
269 }
270 if (uart->irq < 0 && uart->buff_in_count > 0)
271 snd_uart16550_add_timer(uart);
272 }
273
274 /* NOTES ON SERVICING INTERUPTS
275 * ---------------------------
276 * After receiving a interrupt, it is important to indicate to the UART that
277 * this has been done.
278 * For a Rx interrupt, this is done by reading the received byte.
279 * For a Tx interrupt this is done by either:
280 * a) Writing a byte
281 * b) Reading the IIR
282 * It is particularly important to read the IIR if a Tx interrupt is received
283 * when there is no data in tx_buff[], as in this case there no other
284 * indication that the interrupt has been serviced, and it remains outstanding
285 * indefinitely. This has the curious side effect that and no further interrupts
286 * will be generated from this device AT ALL!!.
287 * It is also desirable to clear outstanding interrupts when the device is
288 * opened/closed.
289 *
290 *
291 * Note that some devices need OUT2 to be set before they will generate
292 * interrupts at all. (Possibly tied to an internal pull-up on CTS?)
293 */
294 static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id)
295 {
296 struct snd_uart16550 *uart;
297
298 uart = dev_id;
299 spin_lock(&uart->open_lock);
300 if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
301 spin_unlock(&uart->open_lock);
302 return IRQ_NONE;
303 }
304 /* indicate to the UART that the interrupt has been serviced */
305 inb(uart->base + UART_IIR);
306 snd_uart16550_io_loop(uart);
307 spin_unlock(&uart->open_lock);
308 return IRQ_HANDLED;
309 }
310
311 /* When the polling mode, this function calls snd_uart16550_io_loop. */
312 static void snd_uart16550_buffer_timer(struct timer_list *t)
313 {
314 unsigned long flags;
315 struct snd_uart16550 *uart;
316
317 uart = from_timer(uart, t, buffer_timer);
318 spin_lock_irqsave(&uart->open_lock, flags);
319 snd_uart16550_del_timer(uart);
320 snd_uart16550_io_loop(uart);
321 spin_unlock_irqrestore(&uart->open_lock, flags);
322 }
323
324 /*
325 * this method probes, if an uart sits on given port
326 * return 0 if found
327 * return negative error if not found
328 */
329 static int snd_uart16550_detect(struct snd_uart16550 *uart)
330 {
331 unsigned long io_base = uart->base;
332 int ok;
333 unsigned char c;
334
335 /* Do some vague tests for the presence of the uart */
336 if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
337 return -ENODEV; /* Not configured */
338 }
339
340 uart->res_base = request_region(io_base, 8, "Serial MIDI");
341 if (uart->res_base == NULL) {
342 snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
343 return -EBUSY;
344 }
345
346 /* uart detected unless one of the following tests should fail */
347 ok = 1;
348 /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
349 outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
350 c = inb(io_base + UART_IER);
351 /* The top four bits of the IER should always == 0 */
352 if ((c & 0xf0) != 0)
353 ok = 0; /* failed */
354
355 outb(0xaa, io_base + UART_SCR);
356 /* Write arbitrary data into the scratch reg */
357 c = inb(io_base + UART_SCR);
358 /* If it comes back, it's OK */
359 if (c != 0xaa)
360 ok = 0; /* failed */
361
362 outb(0x55, io_base + UART_SCR);
363 /* Write arbitrary data into the scratch reg */
364 c = inb(io_base + UART_SCR);
365 /* If it comes back, it's OK */
366 if (c != 0x55)
367 ok = 0; /* failed */
368
369 return ok;
370 }
371
372 static void snd_uart16550_do_open(struct snd_uart16550 * uart)
373 {
374 char byte;
375
376 /* Initialize basic variables */
377 uart->buff_in_count = 0;
378 uart->buff_in = 0;
379 uart->buff_out = 0;
380 uart->fifo_limit = 1;
381 uart->fifo_count = 0;
382 uart->timer_running = 0;
383
384 outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
385 | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
386 | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
387 | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
388 /* NOTE: interrupt generated after T=(time)4-bytes
389 * if less than UART_FCR_TRIGGER bytes received
390 */
391 ,uart->base + UART_FCR); /* FIFO Control Register */
392
393 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
394 uart->fifo_limit = 16;
395 if (uart->divisor != 0) {
396 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
397 outb(UART_LCR_DLAB /* Divisor latch access bit */
398 ,uart->base + UART_LCR); /* Line Control Register */
399 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
400 uart->old_divisor_msb = inb(uart->base + UART_DLM);
401
402 outb(uart->divisor
403 ,uart->base + UART_DLL); /* Divisor Latch Low */
404 outb(0
405 ,uart->base + UART_DLM); /* Divisor Latch High */
406 /* DLAB is reset to 0 in next outb() */
407 }
408 /* Set serial parameters (parity off, etc) */
409 outb(UART_LCR_WLEN8 /* 8 data-bits */
410 | 0 /* 1 stop-bit */
411 | 0 /* parity off */
412 | 0 /* DLAB = 0 */
413 ,uart->base + UART_LCR); /* Line Control Register */
414
415 switch (uart->adaptor) {
416 default:
417 outb(UART_MCR_RTS /* Set Request-To-Send line active */
418 | UART_MCR_DTR /* Set Data-Terminal-Ready line active */
419 | UART_MCR_OUT2 /* Set OUT2 - not always required, but when
420 * it is, it is ESSENTIAL for enabling interrupts
421 */
422 ,uart->base + UART_MCR); /* Modem Control Register */
423 break;
424 case SNDRV_SERIAL_MS124W_SA:
425 case SNDRV_SERIAL_MS124W_MB:
426 /* MS-124W can draw power from RTS and DTR if they
427 are in opposite states. */
428 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
429 uart->base + UART_MCR);
430 break;
431 case SNDRV_SERIAL_MS124T:
432 /* MS-124T can draw power from RTS and/or DTR (preferably
433 both) if they are both asserted. */
434 outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
435 uart->base + UART_MCR);
436 break;
437 }
438
439 if (uart->irq < 0) {
440 byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
441 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
442 ;
443 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
444 byte = UART_IER_RDI /* Enable Receiver data interrupt */
445 | UART_IER_MSI /* Enable Modem status interrupt */
446 ;
447 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
448 byte = UART_IER_RDI /* Enable Receiver data interrupt */
449 | UART_IER_MSI /* Enable Modem status interrupt */
450 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
451 ;
452 } else {
453 byte = UART_IER_RDI /* Enable Receiver data interrupt */
454 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
455 ;
456 }
457 outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
458
459 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
460 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
461 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
462 }
463
464 static void snd_uart16550_do_close(struct snd_uart16550 * uart)
465 {
466 if (uart->irq < 0)
467 snd_uart16550_del_timer(uart);
468
469 /* NOTE: may need to disable interrupts before de-registering out handler.
470 * For now, the consequences are harmless.
471 */
472
473 outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
474 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
475 ,uart->base + UART_IER); /* Interrupt enable Register */
476
477 switch (uart->adaptor) {
478 default:
479 outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
480 |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
481 |(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
482 ,uart->base + UART_MCR); /* Modem Control Register */
483 break;
484 case SNDRV_SERIAL_MS124W_SA:
485 case SNDRV_SERIAL_MS124W_MB:
486 /* MS-124W can draw power from RTS and DTR if they
487 are in opposite states; leave it powered. */
488 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2),
489 uart->base + UART_MCR);
490 break;
491 case SNDRV_SERIAL_MS124T:
492 /* MS-124T can draw power from RTS and/or DTR (preferably
493 both) if they are both asserted; leave it powered. */
494 outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2),
495 uart->base + UART_MCR);
496 break;
497 }
498
499 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
500
501 /* Restore old divisor */
502 if (uart->divisor != 0) {
503 outb(UART_LCR_DLAB /* Divisor latch access bit */
504 ,uart->base + UART_LCR); /* Line Control Register */
505 outb(uart->old_divisor_lsb
506 ,uart->base + UART_DLL); /* Divisor Latch Low */
507 outb(uart->old_divisor_msb
508 ,uart->base + UART_DLM); /* Divisor Latch High */
509 /* Restore old LCR (data bits, stop bits, parity, DLAB) */
510 outb(uart->old_line_ctrl_reg
511 ,uart->base + UART_LCR); /* Line Control Register */
512 }
513 }
514
515 static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream)
516 {
517 unsigned long flags;
518 struct snd_uart16550 *uart = substream->rmidi->private_data;
519
520 spin_lock_irqsave(&uart->open_lock, flags);
521 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
522 snd_uart16550_do_open(uart);
523 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
524 uart->midi_input[substream->number] = substream;
525 spin_unlock_irqrestore(&uart->open_lock, flags);
526 return 0;
527 }
528
529 static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream)
530 {
531 unsigned long flags;
532 struct snd_uart16550 *uart = substream->rmidi->private_data;
533
534 spin_lock_irqsave(&uart->open_lock, flags);
535 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
536 uart->midi_input[substream->number] = NULL;
537 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
538 snd_uart16550_do_close(uart);
539 spin_unlock_irqrestore(&uart->open_lock, flags);
540 return 0;
541 }
542
543 static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream,
544 int up)
545 {
546 unsigned long flags;
547 struct snd_uart16550 *uart = substream->rmidi->private_data;
548
549 spin_lock_irqsave(&uart->open_lock, flags);
550 if (up)
551 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
552 else
553 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
554 spin_unlock_irqrestore(&uart->open_lock, flags);
555 }
556
557 static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream)
558 {
559 unsigned long flags;
560 struct snd_uart16550 *uart = substream->rmidi->private_data;
561
562 spin_lock_irqsave(&uart->open_lock, flags);
563 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
564 snd_uart16550_do_open(uart);
565 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
566 uart->midi_output[substream->number] = substream;
567 spin_unlock_irqrestore(&uart->open_lock, flags);
568 return 0;
569 };
570
571 static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream)
572 {
573 unsigned long flags;
574 struct snd_uart16550 *uart = substream->rmidi->private_data;
575
576 spin_lock_irqsave(&uart->open_lock, flags);
577 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
578 uart->midi_output[substream->number] = NULL;
579 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
580 snd_uart16550_do_close(uart);
581 spin_unlock_irqrestore(&uart->open_lock, flags);
582 return 0;
583 };
584
585 static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
586 int Num)
587 {
588 if (uart->buff_in_count + Num < TX_BUFF_SIZE)
589 return 1;
590 else
591 return 0;
592 }
593
594 static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
595 unsigned char byte)
596 {
597 unsigned short buff_in = uart->buff_in;
598 if (uart->buff_in_count < TX_BUFF_SIZE) {
599 uart->tx_buff[buff_in] = byte;
600 buff_in++;
601 buff_in &= TX_BUFF_MASK;
602 uart->buff_in = buff_in;
603 uart->buff_in_count++;
604 if (uart->irq < 0) /* polling mode */
605 snd_uart16550_add_timer(uart);
606 return 1;
607 } else
608 return 0;
609 }
610
611 static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
612 struct snd_rawmidi_substream *substream,
613 unsigned char midi_byte)
614 {
615 if (uart->buff_in_count == 0 /* Buffer empty? */
616 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
617 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
618 (uart->fifo_count == 0 /* FIFO empty? */
619 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
620
621 /* Tx Buffer Empty - try to write immediately */
622 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
623 /* Transmitter holding register (and Tx FIFO) empty */
624 uart->fifo_count = 1;
625 outb(midi_byte, uart->base + UART_TX);
626 } else {
627 if (uart->fifo_count < uart->fifo_limit) {
628 uart->fifo_count++;
629 outb(midi_byte, uart->base + UART_TX);
630 } else {
631 /* Cannot write (buffer empty) -
632 * put char in buffer */
633 snd_uart16550_write_buffer(uart, midi_byte);
634 }
635 }
636 } else {
637 if (!snd_uart16550_write_buffer(uart, midi_byte)) {
638 snd_printk(KERN_WARNING
639 "%s: Buffer overrun on device at 0x%lx\n",
640 uart->rmidi->name, uart->base);
641 return 0;
642 }
643 }
644
645 return 1;
646 }
647
648 static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream)
649 {
650 unsigned long flags;
651 unsigned char midi_byte, addr_byte;
652 struct snd_uart16550 *uart = substream->rmidi->private_data;
653 char first;
654 static unsigned long lasttime = 0;
655
656 /* Interrupts are disabled during the updating of the tx_buff,
657 * since it is 'bad' to have two processes updating the same
658 * variables (ie buff_in & buff_out)
659 */
660
661 spin_lock_irqsave(&uart->open_lock, flags);
662
663 if (uart->irq < 0) /* polling */
664 snd_uart16550_io_loop(uart);
665
666 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
667 while (1) {
668 /* buffer full? */
669 /* in this mode we need two bytes of space */
670 if (uart->buff_in_count > TX_BUFF_SIZE - 2)
671 break;
672 if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
673 break;
674 #ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
675 /* select exactly one of the four ports */
676 addr_byte = (1 << (substream->number + 4)) | 0x08;
677 #else
678 /* select any combination of the four ports */
679 addr_byte = (substream->number << 4) | 0x08;
680 /* ...except none */
681 if (addr_byte == 0x08)
682 addr_byte = 0xf8;
683 #endif
684 snd_uart16550_output_byte(uart, substream, addr_byte);
685 /* send midi byte */
686 snd_uart16550_output_byte(uart, substream, midi_byte);
687 }
688 } else {
689 first = 0;
690 while (snd_rawmidi_transmit_peek(substream, &midi_byte, 1) == 1) {
691 /* Also send F5 after 3 seconds with no data
692 * to handle device disconnect */
693 if (first == 0 &&
694 (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
695 uart->adaptor == SNDRV_SERIAL_GENERIC) &&
696 (uart->prev_out != substream->number ||
697 time_after(jiffies, lasttime + 3*HZ))) {
698
699 if (snd_uart16550_buffer_can_write(uart, 3)) {
700 /* Roland Soundcanvas part selection */
701 /* If this substream of the data is
702 * different previous substream
703 * in this uart, send the change part
704 * event
705 */
706 uart->prev_out = substream->number;
707 /* change part */
708 snd_uart16550_output_byte(uart, substream,
709 0xf5);
710 /* data */
711 snd_uart16550_output_byte(uart, substream,
712 uart->prev_out + 1);
713 /* If midi_byte is a data byte,
714 * send the previous status byte */
715 if (midi_byte < 0x80 &&
716 uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
717 snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
718 } else if (!uart->drop_on_full)
719 break;
720
721 }
722
723 /* send midi byte */
724 if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&
725 !uart->drop_on_full )
726 break;
727
728 if (midi_byte >= 0x80 && midi_byte < 0xf0)
729 uart->prev_status[uart->prev_out] = midi_byte;
730 first = 1;
731
732 snd_rawmidi_transmit_ack( substream, 1 );
733 }
734 lasttime = jiffies;
735 }
736 spin_unlock_irqrestore(&uart->open_lock, flags);
737 }
738
739 static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream,
740 int up)
741 {
742 unsigned long flags;
743 struct snd_uart16550 *uart = substream->rmidi->private_data;
744
745 spin_lock_irqsave(&uart->open_lock, flags);
746 if (up)
747 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
748 else
749 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
750 spin_unlock_irqrestore(&uart->open_lock, flags);
751 if (up)
752 snd_uart16550_output_write(substream);
753 }
754
755 static const struct snd_rawmidi_ops snd_uart16550_output =
756 {
757 .open = snd_uart16550_output_open,
758 .close = snd_uart16550_output_close,
759 .trigger = snd_uart16550_output_trigger,
760 };
761
762 static const struct snd_rawmidi_ops snd_uart16550_input =
763 {
764 .open = snd_uart16550_input_open,
765 .close = snd_uart16550_input_close,
766 .trigger = snd_uart16550_input_trigger,
767 };
768
769 static int snd_uart16550_free(struct snd_uart16550 *uart)
770 {
771 if (uart->irq >= 0)
772 free_irq(uart->irq, uart);
773 release_and_free_resource(uart->res_base);
774 kfree(uart);
775 return 0;
776 };
777
778 static int snd_uart16550_dev_free(struct snd_device *device)
779 {
780 struct snd_uart16550 *uart = device->device_data;
781 return snd_uart16550_free(uart);
782 }
783
784 static int snd_uart16550_create(struct snd_card *card,
785 unsigned long iobase,
786 int irq,
787 unsigned int speed,
788 unsigned int base,
789 int adaptor,
790 int droponfull,
791 struct snd_uart16550 **ruart)
792 {
793 static struct snd_device_ops ops = {
794 .dev_free = snd_uart16550_dev_free,
795 };
796 struct snd_uart16550 *uart;
797 int err;
798
799
800 if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL)
801 return -ENOMEM;
802 uart->adaptor = adaptor;
803 uart->card = card;
804 spin_lock_init(&uart->open_lock);
805 uart->irq = -1;
806 uart->base = iobase;
807 uart->drop_on_full = droponfull;
808
809 if ((err = snd_uart16550_detect(uart)) <= 0) {
810 printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
811 snd_uart16550_free(uart);
812 return -ENODEV;
813 }
814
815 if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
816 if (request_irq(irq, snd_uart16550_interrupt,
817 0, "Serial MIDI", uart)) {
818 snd_printk(KERN_WARNING
819 "irq %d busy. Using Polling.\n", irq);
820 } else {
821 uart->irq = irq;
822 }
823 }
824 uart->divisor = base / speed;
825 uart->speed = base / (unsigned int)uart->divisor;
826 uart->speed_base = base;
827 uart->prev_out = -1;
828 uart->prev_in = 0;
829 uart->rstatus = 0;
830 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
831 timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0);
832 uart->timer_running = 0;
833
834 /* Register device */
835 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
836 snd_uart16550_free(uart);
837 return err;
838 }
839
840 switch (uart->adaptor) {
841 case SNDRV_SERIAL_MS124W_SA:
842 case SNDRV_SERIAL_MS124W_MB:
843 /* MS-124W can draw power from RTS and DTR if they
844 are in opposite states. */
845 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
846 break;
847 case SNDRV_SERIAL_MS124T:
848 /* MS-124T can draw power from RTS and/or DTR (preferably
849 both) if they are asserted. */
850 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
851 break;
852 default:
853 break;
854 }
855
856 if (ruart)
857 *ruart = uart;
858
859 return 0;
860 }
861
862 static void snd_uart16550_substreams(struct snd_rawmidi_str *stream)
863 {
864 struct snd_rawmidi_substream *substream;
865
866 list_for_each_entry(substream, &stream->substreams, list) {
867 sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
868 }
869 }
870
871 static int snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
872 int outs, int ins,
873 struct snd_rawmidi **rmidi)
874 {
875 struct snd_rawmidi *rrawmidi;
876 int err;
877
878 err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
879 outs, ins, &rrawmidi);
880 if (err < 0)
881 return err;
882 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT,
883 &snd_uart16550_input);
884 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
885 &snd_uart16550_output);
886 strcpy(rrawmidi->name, "Serial MIDI");
887 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
888 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
889 rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
890 SNDRV_RAWMIDI_INFO_INPUT |
891 SNDRV_RAWMIDI_INFO_DUPLEX;
892 rrawmidi->private_data = uart;
893 if (rmidi)
894 *rmidi = rrawmidi;
895 return 0;
896 }
897
898 static int snd_serial_probe(struct platform_device *devptr)
899 {
900 struct snd_card *card;
901 struct snd_uart16550 *uart;
902 int err;
903 int dev = devptr->id;
904
905 switch (adaptor[dev]) {
906 case SNDRV_SERIAL_SOUNDCANVAS:
907 ins[dev] = 1;
908 break;
909 case SNDRV_SERIAL_MS124T:
910 case SNDRV_SERIAL_MS124W_SA:
911 outs[dev] = 1;
912 ins[dev] = 1;
913 break;
914 case SNDRV_SERIAL_MS124W_MB:
915 outs[dev] = 16;
916 ins[dev] = 1;
917 break;
918 case SNDRV_SERIAL_GENERIC:
919 break;
920 default:
921 snd_printk(KERN_ERR
922 "Adaptor type is out of range 0-%d (%d)\n",
923 SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
924 return -ENODEV;
925 }
926
927 if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
928 snd_printk(KERN_ERR
929 "Count of outputs is out of range 1-%d (%d)\n",
930 SNDRV_SERIAL_MAX_OUTS, outs[dev]);
931 return -ENODEV;
932 }
933
934 if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) {
935 snd_printk(KERN_ERR
936 "Count of inputs is out of range 1-%d (%d)\n",
937 SNDRV_SERIAL_MAX_INS, ins[dev]);
938 return -ENODEV;
939 }
940
941 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
942 0, &card);
943 if (err < 0)
944 return err;
945
946 strcpy(card->driver, "Serial");
947 strcpy(card->shortname, "Serial MIDI (UART16550A)");
948
949 if ((err = snd_uart16550_create(card,
950 port[dev],
951 irq[dev],
952 speed[dev],
953 base[dev],
954 adaptor[dev],
955 droponfull[dev],
956 &uart)) < 0)
957 goto _err;
958
959 err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
960 if (err < 0)
961 goto _err;
962
963 sprintf(card->longname, "%s [%s] at %#lx, irq %d",
964 card->shortname,
965 adaptor_names[uart->adaptor],
966 uart->base,
967 uart->irq);
968
969 if ((err = snd_card_register(card)) < 0)
970 goto _err;
971
972 platform_set_drvdata(devptr, card);
973 return 0;
974
975 _err:
976 snd_card_free(card);
977 return err;
978 }
979
980 static int snd_serial_remove(struct platform_device *devptr)
981 {
982 snd_card_free(platform_get_drvdata(devptr));
983 return 0;
984 }
985
986 #define SND_SERIAL_DRIVER "snd_serial_u16550"
987
988 static struct platform_driver snd_serial_driver = {
989 .probe = snd_serial_probe,
990 .remove = snd_serial_remove,
991 .driver = {
992 .name = SND_SERIAL_DRIVER,
993 },
994 };
995
996 static void snd_serial_unregister_all(void)
997 {
998 int i;
999
1000 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1001 platform_device_unregister(devices[i]);
1002 platform_driver_unregister(&snd_serial_driver);
1003 }
1004
1005 static int __init alsa_card_serial_init(void)
1006 {
1007 int i, cards, err;
1008
1009 if ((err = platform_driver_register(&snd_serial_driver)) < 0)
1010 return err;
1011
1012 cards = 0;
1013 for (i = 0; i < SNDRV_CARDS; i++) {
1014 struct platform_device *device;
1015 if (! enable[i])
1016 continue;
1017 device = platform_device_register_simple(SND_SERIAL_DRIVER,
1018 i, NULL, 0);
1019 if (IS_ERR(device))
1020 continue;
1021 if (!platform_get_drvdata(device)) {
1022 platform_device_unregister(device);
1023 continue;
1024 }
1025 devices[i] = device;
1026 cards++;
1027 }
1028 if (! cards) {
1029 #ifdef MODULE
1030 printk(KERN_ERR "serial midi soundcard not found or device busy\n");
1031 #endif
1032 snd_serial_unregister_all();
1033 return -ENODEV;
1034 }
1035 return 0;
1036 }
1037
1038 static void __exit alsa_card_serial_exit(void)
1039 {
1040 snd_serial_unregister_all();
1041 }
1042
1043 module_init(alsa_card_serial_init)
1044 module_exit(alsa_card_serial_exit)
Linux with added FPC-III support