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security: avoid calling a NULL function pointer in drivers/video/tvaudio.c
[linux/fpc-iii.git] / sound / drivers / serial-u16550.c
blobd8aab9da97c29ad8058f5be9751537b25b043500
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/moduleparam.h>
40 #include <sound/core.h>
41 #include <sound/rawmidi.h>
42 #include <sound/initval.h>
43
44 #include <linux/serial_reg.h>
45 #include <linux/jiffies.h>
46
47 #include <asm/io.h>
48
49 MODULE_DESCRIPTION("MIDI serial u16550");
50 MODULE_LICENSE("GPL");
51 MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
52
53 #define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
54 #define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
55 #define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
56 #define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
57 #define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
58 #define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
59 static char *adaptor_names[] = {
60 "Soundcanvas",
61 "MS-124T",
62 "MS-124W S/A",
63 "MS-124W M/B",
64 "Generic"
65 };
66
67 #define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
68 #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
69
70 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
71 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
72 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
73 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
74 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
75 static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
76 static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
77 static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
78 static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
79 static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
80 static int droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
81
82 module_param_array(index, int, NULL, 0444);
83 MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
84 module_param_array(id, charp, NULL, 0444);
85 MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
86 module_param_array(enable, bool, NULL, 0444);
87 MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
88 module_param_array(port, long, NULL, 0444);
89 MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
90 module_param_array(irq, int, NULL, 0444);
91 MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
92 module_param_array(speed, int, NULL, 0444);
93 MODULE_PARM_DESC(speed, "Speed in bauds.");
94 module_param_array(base, int, NULL, 0444);
95 MODULE_PARM_DESC(base, "Base for divisor in bauds.");
96 module_param_array(outs, int, NULL, 0444);
97 MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
98 module_param_array(ins, int, NULL, 0444);
99 MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
100 module_param_array(droponfull, bool, NULL, 0444);
101 MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
102
103 module_param_array(adaptor, int, NULL, 0444);
104 MODULE_PARM_DESC(adaptor, "Type of adaptor.");
105
106 /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
107
108 #define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
109 #define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
110
111 #define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
112 #define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
113
114 #define SERIAL_MODE_NOT_OPENED (0)
115 #define SERIAL_MODE_INPUT_OPEN (1 << 0)
116 #define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
117 #define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
118 #define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
119
120 struct snd_uart16550 {
121 struct snd_card *card;
122 struct snd_rawmidi *rmidi;
123 struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS];
124 struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS];
125
126 int filemode; /* open status of file */
127
128 spinlock_t open_lock;
129
130 int irq;
131
132 unsigned long base;
133 struct resource *res_base;
134
135 unsigned int speed;
136 unsigned int speed_base;
137 unsigned char divisor;
138
139 unsigned char old_divisor_lsb;
140 unsigned char old_divisor_msb;
141 unsigned char old_line_ctrl_reg;
142
143 /* parameter for using of write loop */
144 short int fifo_limit; /* used in uart16550 */
145 short int fifo_count; /* used in uart16550 */
146
147 /* type of adaptor */
148 int adaptor;
149
150 /* inputs */
151 int prev_in;
152 unsigned char rstatus;
153
154 /* outputs */
155 int prev_out;
156 unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
157
158 /* write buffer and its writing/reading position */
159 unsigned char tx_buff[TX_BUFF_SIZE];
160 int buff_in_count;
161 int buff_in;
162 int buff_out;
163 int drop_on_full;
164
165 /* wait timer */
166 unsigned int timer_running:1;
167 struct timer_list buffer_timer;
168
169 };
170
171 static struct platform_device *devices[SNDRV_CARDS];
172
173 static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart)
174 {
175 if (!uart->timer_running) {
176 /* timer 38600bps * 10bit * 16byte */
177 uart->buffer_timer.expires = jiffies + (HZ+255)/256;
178 uart->timer_running = 1;
179 add_timer(&uart->buffer_timer);
180 }
181 }
182
183 static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart)
184 {
185 if (uart->timer_running) {
186 del_timer(&uart->buffer_timer);
187 uart->timer_running = 0;
188 }
189 }
190
191 /* This macro is only used in snd_uart16550_io_loop */
192 static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart)
193 {
194 unsigned short buff_out = uart->buff_out;
195 if (uart->buff_in_count > 0) {
196 outb(uart->tx_buff[buff_out], uart->base + UART_TX);
197 uart->fifo_count++;
198 buff_out++;
199 buff_out &= TX_BUFF_MASK;
200 uart->buff_out = buff_out;
201 uart->buff_in_count--;
202 }
203 }
204
205 /* This loop should be called with interrupts disabled
206 * We don't want to interrupt this,
207 * as we're already handling an interrupt
208 */
209 static void snd_uart16550_io_loop(struct snd_uart16550 * uart)
210 {
211 unsigned char c, status;
212 int substream;
213
214 /* recall previous stream */
215 substream = uart->prev_in;
216
217 /* Read Loop */
218 while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
219 /* while receive data ready */
220 c = inb(uart->base + UART_RX);
221
222 /* keep track of last status byte */
223 if (c & 0x80)
224 uart->rstatus = c;
225
226 /* handle stream switch */
227 if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
228 if (uart->rstatus == 0xf5) {
229 if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
230 substream = c - 1;
231 if (c != 0xf5)
232 /* prevent future bytes from being
233 interpreted as streams */
234 uart->rstatus = 0;
235 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
236 && uart->midi_input[substream])
237 snd_rawmidi_receive(uart->midi_input[substream],
238 &c, 1);
239 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
240 uart->midi_input[substream])
241 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
242
243 if (status & UART_LSR_OE)
244 snd_printk("%s: Overrun on device at 0x%lx\n",
245 uart->rmidi->name, uart->base);
246 }
247
248 /* remember the last stream */
249 uart->prev_in = substream;
250
251 /* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
252 buffer is never filled. */
253 /* Check write status */
254 if (status & UART_LSR_THRE)
255 uart->fifo_count = 0;
256 if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
257 || uart->adaptor == SNDRV_SERIAL_GENERIC) {
258 /* Can't use FIFO, must send only when CTS is true */
259 status = inb(uart->base + UART_MSR);
260 while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
261 uart->buff_in_count > 0) {
262 snd_uart16550_buffer_output(uart);
263 status = inb(uart->base + UART_MSR);
264 }
265 } else {
266 /* Write loop */
267 while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
268 && uart->buff_in_count > 0) /* Do we want to? */
269 snd_uart16550_buffer_output(uart);
270 }
271 if (uart->irq < 0 && uart->buff_in_count > 0)
272 snd_uart16550_add_timer(uart);
273 }
274
275 /* NOTES ON SERVICING INTERUPTS
276 * ---------------------------
277 * After receiving a interrupt, it is important to indicate to the UART that
278 * this has been done.
279 * For a Rx interrupt, this is done by reading the received byte.
280 * For a Tx interrupt this is done by either:
281 * a) Writing a byte
282 * b) Reading the IIR
283 * It is particularly important to read the IIR if a Tx interrupt is received
284 * when there is no data in tx_buff[], as in this case there no other
285 * indication that the interrupt has been serviced, and it remains outstanding
286 * indefinitely. This has the curious side effect that and no further interrupts
287 * will be generated from this device AT ALL!!.
288 * It is also desirable to clear outstanding interrupts when the device is
289 * opened/closed.
290 *
291 *
292 * Note that some devices need OUT2 to be set before they will generate
293 * interrupts at all. (Possibly tied to an internal pull-up on CTS?)
294 */
295 static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id)
296 {
297 struct snd_uart16550 *uart;
298
299 uart = dev_id;
300 spin_lock(&uart->open_lock);
301 if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
302 spin_unlock(&uart->open_lock);
303 return IRQ_NONE;
304 }
305 /* indicate to the UART that the interrupt has been serviced */
306 inb(uart->base + UART_IIR);
307 snd_uart16550_io_loop(uart);
308 spin_unlock(&uart->open_lock);
309 return IRQ_HANDLED;
310 }
311
312 /* When the polling mode, this function calls snd_uart16550_io_loop. */
313 static void snd_uart16550_buffer_timer(unsigned long data)
314 {
315 unsigned long flags;
316 struct snd_uart16550 *uart;
317
318 uart = (struct snd_uart16550 *)data;
319 spin_lock_irqsave(&uart->open_lock, flags);
320 snd_uart16550_del_timer(uart);
321 snd_uart16550_io_loop(uart);
322 spin_unlock_irqrestore(&uart->open_lock, flags);
323 }
324
325 /*
326 * this method probes, if an uart sits on given port
327 * return 0 if found
328 * return negative error if not found
329 */
330 static int __devinit snd_uart16550_detect(struct snd_uart16550 *uart)
331 {
332 unsigned long io_base = uart->base;
333 int ok;
334 unsigned char c;
335
336 /* Do some vague tests for the presence of the uart */
337 if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
338 return -ENODEV; /* Not configured */
339 }
340
341 uart->res_base = request_region(io_base, 8, "Serial MIDI");
342 if (uart->res_base == NULL) {
343 snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
344 return -EBUSY;
345 }
346
347 /* uart detected unless one of the following tests should fail */
348 ok = 1;
349 /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
350 outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
351 c = inb(io_base + UART_IER);
352 /* The top four bits of the IER should always == 0 */
353 if ((c & 0xf0) != 0)
354 ok = 0; /* failed */
355
356 outb(0xaa, io_base + UART_SCR);
357 /* Write arbitrary data into the scratch reg */
358 c = inb(io_base + UART_SCR);
359 /* If it comes back, it's OK */
360 if (c != 0xaa)
361 ok = 0; /* failed */
362
363 outb(0x55, io_base + UART_SCR);
364 /* Write arbitrary data into the scratch reg */
365 c = inb(io_base + UART_SCR);
366 /* If it comes back, it's OK */
367 if (c != 0x55)
368 ok = 0; /* failed */
369
370 return ok;
371 }
372
373 static void snd_uart16550_do_open(struct snd_uart16550 * uart)
374 {
375 char byte;
376
377 /* Initialize basic variables */
378 uart->buff_in_count = 0;
379 uart->buff_in = 0;
380 uart->buff_out = 0;
381 uart->fifo_limit = 1;
382 uart->fifo_count = 0;
383 uart->timer_running = 0;
384
385 outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
386 | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
387 | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
388 | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
389 /* NOTE: interrupt generated after T=(time)4-bytes
390 * if less than UART_FCR_TRIGGER bytes received
391 */
392 ,uart->base + UART_FCR); /* FIFO Control Register */
393
394 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
395 uart->fifo_limit = 16;
396 if (uart->divisor != 0) {
397 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
398 outb(UART_LCR_DLAB /* Divisor latch access bit */
399 ,uart->base + UART_LCR); /* Line Control Register */
400 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
401 uart->old_divisor_msb = inb(uart->base + UART_DLM);
402
403 outb(uart->divisor
404 ,uart->base + UART_DLL); /* Divisor Latch Low */
405 outb(0
406 ,uart->base + UART_DLM); /* Divisor Latch High */
407 /* DLAB is reset to 0 in next outb() */
408 }
409 /* Set serial parameters (parity off, etc) */
410 outb(UART_LCR_WLEN8 /* 8 data-bits */
411 | 0 /* 1 stop-bit */
412 | 0 /* parity off */
413 | 0 /* DLAB = 0 */
414 ,uart->base + UART_LCR); /* Line Control Register */
415
416 switch (uart->adaptor) {
417 default:
418 outb(UART_MCR_RTS /* Set Request-To-Send line active */
419 | UART_MCR_DTR /* Set Data-Terminal-Ready line active */
420 | UART_MCR_OUT2 /* Set OUT2 - not always required, but when
421 * it is, it is ESSENTIAL for enabling interrupts
422 */
423 ,uart->base + UART_MCR); /* Modem Control Register */
424 break;
425 case SNDRV_SERIAL_MS124W_SA:
426 case SNDRV_SERIAL_MS124W_MB:
427 /* MS-124W can draw power from RTS and DTR if they
428 are in opposite states. */
429 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
430 uart->base + UART_MCR);
431 break;
432 case SNDRV_SERIAL_MS124T:
433 /* MS-124T can draw power from RTS and/or DTR (preferably
434 both) if they are both asserted. */
435 outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
436 uart->base + UART_MCR);
437 break;
438 }
439
440 if (uart->irq < 0) {
441 byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
442 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
443 ;
444 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
445 byte = UART_IER_RDI /* Enable Receiver data interrupt */
446 | UART_IER_MSI /* Enable Modem status interrupt */
447 ;
448 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
449 byte = UART_IER_RDI /* Enable Receiver data interrupt */
450 | UART_IER_MSI /* Enable Modem status interrupt */
451 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
452 ;
453 } else {
454 byte = UART_IER_RDI /* Enable Receiver data interrupt */
455 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
456 ;
457 }
458 outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
459
460 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
461 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
462 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
463 }
464
465 static void snd_uart16550_do_close(struct snd_uart16550 * uart)
466 {
467 if (uart->irq < 0)
468 snd_uart16550_del_timer(uart);
469
470 /* NOTE: may need to disable interrupts before de-registering out handler.
471 * For now, the consequences are harmless.
472 */
473
474 outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
475 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
476 ,uart->base + UART_IER); /* Interrupt enable Register */
477
478 switch (uart->adaptor) {
479 default:
480 outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
481 |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
482 |(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
483 ,uart->base + UART_MCR); /* Modem Control Register */
484 break;
485 case SNDRV_SERIAL_MS124W_SA:
486 case SNDRV_SERIAL_MS124W_MB:
487 /* MS-124W can draw power from RTS and DTR if they
488 are in opposite states; leave it powered. */
489 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2),
490 uart->base + UART_MCR);
491 break;
492 case SNDRV_SERIAL_MS124T:
493 /* MS-124T can draw power from RTS and/or DTR (preferably
494 both) if they are both asserted; leave it powered. */
495 outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2),
496 uart->base + UART_MCR);
497 break;
498 }
499
500 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
501
502 /* Restore old divisor */
503 if (uart->divisor != 0) {
504 outb(UART_LCR_DLAB /* Divisor latch access bit */
505 ,uart->base + UART_LCR); /* Line Control Register */
506 outb(uart->old_divisor_lsb
507 ,uart->base + UART_DLL); /* Divisor Latch Low */
508 outb(uart->old_divisor_msb
509 ,uart->base + UART_DLM); /* Divisor Latch High */
510 /* Restore old LCR (data bits, stop bits, parity, DLAB) */
511 outb(uart->old_line_ctrl_reg
512 ,uart->base + UART_LCR); /* Line Control Register */
513 }
514 }
515
516 static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream)
517 {
518 unsigned long flags;
519 struct snd_uart16550 *uart = substream->rmidi->private_data;
520
521 spin_lock_irqsave(&uart->open_lock, flags);
522 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
523 snd_uart16550_do_open(uart);
524 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
525 uart->midi_input[substream->number] = substream;
526 spin_unlock_irqrestore(&uart->open_lock, flags);
527 return 0;
528 }
529
530 static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream)
531 {
532 unsigned long flags;
533 struct snd_uart16550 *uart = substream->rmidi->private_data;
534
535 spin_lock_irqsave(&uart->open_lock, flags);
536 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
537 uart->midi_input[substream->number] = NULL;
538 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
539 snd_uart16550_do_close(uart);
540 spin_unlock_irqrestore(&uart->open_lock, flags);
541 return 0;
542 }
543
544 static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream,
545 int up)
546 {
547 unsigned long flags;
548 struct snd_uart16550 *uart = substream->rmidi->private_data;
549
550 spin_lock_irqsave(&uart->open_lock, flags);
551 if (up)
552 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
553 else
554 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
555 spin_unlock_irqrestore(&uart->open_lock, flags);
556 }
557
558 static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream)
559 {
560 unsigned long flags;
561 struct snd_uart16550 *uart = substream->rmidi->private_data;
562
563 spin_lock_irqsave(&uart->open_lock, flags);
564 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
565 snd_uart16550_do_open(uart);
566 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
567 uart->midi_output[substream->number] = substream;
568 spin_unlock_irqrestore(&uart->open_lock, flags);
569 return 0;
570 };
571
572 static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream)
573 {
574 unsigned long flags;
575 struct snd_uart16550 *uart = substream->rmidi->private_data;
576
577 spin_lock_irqsave(&uart->open_lock, flags);
578 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
579 uart->midi_output[substream->number] = NULL;
580 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
581 snd_uart16550_do_close(uart);
582 spin_unlock_irqrestore(&uart->open_lock, flags);
583 return 0;
584 };
585
586 static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
587 int Num)
588 {
589 if (uart->buff_in_count + Num < TX_BUFF_SIZE)
590 return 1;
591 else
592 return 0;
593 }
594
595 static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
596 unsigned char byte)
597 {
598 unsigned short buff_in = uart->buff_in;
599 if (uart->buff_in_count < TX_BUFF_SIZE) {
600 uart->tx_buff[buff_in] = byte;
601 buff_in++;
602 buff_in &= TX_BUFF_MASK;
603 uart->buff_in = buff_in;
604 uart->buff_in_count++;
605 if (uart->irq < 0) /* polling mode */
606 snd_uart16550_add_timer(uart);
607 return 1;
608 } else
609 return 0;
610 }
611
612 static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
613 struct snd_rawmidi_substream *substream,
614 unsigned char midi_byte)
615 {
616 if (uart->buff_in_count == 0 /* Buffer empty? */
617 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
618 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
619 (uart->fifo_count == 0 /* FIFO empty? */
620 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
621
622 /* Tx Buffer Empty - try to write immediately */
623 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
624 /* Transmitter holding register (and Tx FIFO) empty */
625 uart->fifo_count = 1;
626 outb(midi_byte, uart->base + UART_TX);
627 } else {
628 if (uart->fifo_count < uart->fifo_limit) {
629 uart->fifo_count++;
630 outb(midi_byte, uart->base + UART_TX);
631 } else {
632 /* Cannot write (buffer empty) -
633 * put char in buffer */
634 snd_uart16550_write_buffer(uart, midi_byte);
635 }
636 }
637 } else {
638 if (!snd_uart16550_write_buffer(uart, midi_byte)) {
639 snd_printk("%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 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 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 __devinit 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 IRQF_DISABLED, "Serial MIDI", uart)) {
818 snd_printk("irq %d busy. Using Polling.\n", irq);
819 } else {
820 uart->irq = irq;
821 }
822 }
823 uart->divisor = base / speed;
824 uart->speed = base / (unsigned int)uart->divisor;
825 uart->speed_base = base;
826 uart->prev_out = -1;
827 uart->prev_in = 0;
828 uart->rstatus = 0;
829 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
830 init_timer(&uart->buffer_timer);
831 uart->buffer_timer.function = snd_uart16550_buffer_timer;
832 uart->buffer_timer.data = (unsigned long)uart;
833 uart->timer_running = 0;
834
835 /* Register device */
836 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
837 snd_uart16550_free(uart);
838 return err;
839 }
840
841 switch (uart->adaptor) {
842 case SNDRV_SERIAL_MS124W_SA:
843 case SNDRV_SERIAL_MS124W_MB:
844 /* MS-124W can draw power from RTS and DTR if they
845 are in opposite states. */
846 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
847 break;
848 case SNDRV_SERIAL_MS124T:
849 /* MS-124T can draw power from RTS and/or DTR (preferably
850 both) if they are asserted. */
851 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
852 break;
853 default:
854 break;
855 }
856
857 if (ruart)
858 *ruart = uart;
859
860 return 0;
861 }
862
863 static void __devinit snd_uart16550_substreams(struct snd_rawmidi_str *stream)
864 {
865 struct snd_rawmidi_substream *substream;
866
867 list_for_each_entry(substream, &stream->substreams, list) {
868 sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
869 }
870 }
871
872 static int __devinit snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
873 int outs, int ins,
874 struct snd_rawmidi **rmidi)
875 {
876 struct snd_rawmidi *rrawmidi;
877 int err;
878
879 err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
880 outs, ins, &rrawmidi);
881 if (err < 0)
882 return err;
883 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT,
884 &snd_uart16550_input);
885 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
886 &snd_uart16550_output);
887 strcpy(rrawmidi->name, "Serial MIDI");
888 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
889 snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
890 rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
891 SNDRV_RAWMIDI_INFO_INPUT |
892 SNDRV_RAWMIDI_INFO_DUPLEX;
893 rrawmidi->private_data = uart;
894 if (rmidi)
895 *rmidi = rrawmidi;
896 return 0;
897 }
898
899 static int __devinit snd_serial_probe(struct platform_device *devptr)
900 {
901 struct snd_card *card;
902 struct snd_uart16550 *uart;
903 int err;
904 int dev = devptr->id;
905
906 switch (adaptor[dev]) {
907 case SNDRV_SERIAL_SOUNDCANVAS:
908 ins[dev] = 1;
909 break;
910 case SNDRV_SERIAL_MS124T:
911 case SNDRV_SERIAL_MS124W_SA:
912 outs[dev] = 1;
913 ins[dev] = 1;
914 break;
915 case SNDRV_SERIAL_MS124W_MB:
916 outs[dev] = 16;
917 ins[dev] = 1;
918 break;
919 case SNDRV_SERIAL_GENERIC:
920 break;
921 default:
922 snd_printk("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("Count of outputs is out of range 1-%d (%d)\n",
929 SNDRV_SERIAL_MAX_OUTS, outs[dev]);
930 return -ENODEV;
931 }
932
933 if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) {
934 snd_printk("Count of inputs is out of range 1-%d (%d)\n",
935 SNDRV_SERIAL_MAX_INS, ins[dev]);
936 return -ENODEV;
937 }
938
939 card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
940 if (card == NULL)
941 return -ENOMEM;
942
943 strcpy(card->driver, "Serial");
944 strcpy(card->shortname, "Serial MIDI (UART16550A)");
945
946 if ((err = snd_uart16550_create(card,
947 port[dev],
948 irq[dev],
949 speed[dev],
950 base[dev],
951 adaptor[dev],
952 droponfull[dev],
953 &uart)) < 0)
954 goto _err;
955
956 err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
957 if (err < 0)
958 goto _err;
959
960 sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d ins %d adaptor %s droponfull %d",
961 card->shortname,
962 uart->base,
963 uart->irq,
964 uart->speed,
965 (int)uart->divisor,
966 outs[dev],
967 ins[dev],
968 adaptor_names[uart->adaptor],
969 uart->drop_on_full);
970
971 snd_card_set_dev(card, &devptr->dev);
972
973 if ((err = snd_card_register(card)) < 0)
974 goto _err;
975
976 platform_set_drvdata(devptr, card);
977 return 0;
978
979 _err:
980 snd_card_free(card);
981 return err;
982 }
983
984 static int __devexit snd_serial_remove(struct platform_device *devptr)
985 {
986 snd_card_free(platform_get_drvdata(devptr));
987 platform_set_drvdata(devptr, NULL);
988 return 0;
989 }
990
991 #define SND_SERIAL_DRIVER "snd_serial_u16550"
992
993 static struct platform_driver snd_serial_driver = {
994 .probe = snd_serial_probe,
995 .remove = __devexit_p( snd_serial_remove),
996 .driver = {
997 .name = SND_SERIAL_DRIVER
998 },
999 };
1000
1001 static void snd_serial_unregister_all(void)
1002 {
1003 int i;
1004
1005 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1006 platform_device_unregister(devices[i]);
1007 platform_driver_unregister(&snd_serial_driver);
1008 }
1009
1010 static int __init alsa_card_serial_init(void)
1011 {
1012 int i, cards, err;
1013
1014 if ((err = platform_driver_register(&snd_serial_driver)) < 0)
1015 return err;
1016
1017 cards = 0;
1018 for (i = 0; i < SNDRV_CARDS; i++) {
1019 struct platform_device *device;
1020 if (! enable[i])
1021 continue;
1022 device = platform_device_register_simple(SND_SERIAL_DRIVER,
1023 i, NULL, 0);
1024 if (IS_ERR(device))
1025 continue;
1026 if (!platform_get_drvdata(device)) {
1027 platform_device_unregister(device);
1028 continue;
1029 }
1030 devices[i] = device;
1031 cards++;
1032 }
1033 if (! cards) {
1034 #ifdef MODULE
1035 printk(KERN_ERR "serial midi soundcard not found or device busy\n");
1036 #endif
1037 snd_serial_unregister_all();
1038 return -ENODEV;
1039 }
1040 return 0;
1041 }
1042
1043 static void __exit alsa_card_serial_exit(void)
1044 {
1045 snd_serial_unregister_all();
1046 }
1047
1048 module_init(alsa_card_serial_init)
1049 module_exit(alsa_card_serial_exit)
Linux with added FPC-III support