3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>,
4 * Isaku Yamahata <yamahata@private.email.ne.jp>,
5 * George Hansper <ghansper@apana.org.au>,
8 * This code is based on the code from ALSA 0.5.9, but heavily rewritten.
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.
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.
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
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.
30 * More documentation can be found in serial-u16550.txt.
33 #include <sound/driver.h>
34 #include <linux/init.h>
35 #include <linux/interrupt.h>
36 #include <linux/slab.h>
37 #include <linux/ioport.h>
38 #include <linux/moduleparam.h>
39 #include <sound/core.h>
40 #include <sound/rawmidi.h>
41 #include <sound/initval.h>
43 #include <linux/serial_reg.h>
47 MODULE_DESCRIPTION("MIDI serial u16550");
48 MODULE_LICENSE("GPL");
49 MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
51 #define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
52 #define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
53 #define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
54 #define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
55 #define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
56 #define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
57 static char *adaptor_names[] = {
65 #define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
66 #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
68 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
69 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
70 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
71 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
72 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
73 static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
74 static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
75 static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
76 static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
77 static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
78 static int droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
80 module_param_array(index, int, NULL, 0444);
81 MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
82 module_param_array(id, charp, NULL, 0444);
83 MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
84 module_param_array(enable, bool, NULL, 0444);
85 MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
86 module_param_array(port, long, NULL, 0444);
87 MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
88 module_param_array(irq, int, NULL, 0444);
89 MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
90 module_param_array(speed, int, NULL, 0444);
91 MODULE_PARM_DESC(speed, "Speed in bauds.");
92 module_param_array(base, int, NULL, 0444);
93 MODULE_PARM_DESC(base, "Base for divisor in bauds.");
94 module_param_array(outs, int, NULL, 0444);
95 MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
96 module_param_array(ins, int, NULL, 0444);
97 MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
98 module_param_array(droponfull, bool, NULL, 0444);
99 MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
101 module_param_array(adaptor, int, NULL, 0444);
102 MODULE_PARM_DESC(adaptor, "Type of adaptor.");
104 /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
106 #define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
107 #define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
109 #define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
110 #define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
112 #define SERIAL_MODE_NOT_OPENED (0)
113 #define SERIAL_MODE_INPUT_OPEN (1 << 0)
114 #define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
115 #define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
116 #define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
118 typedef struct _snd_uart16550 {
120 snd_rawmidi_t *rmidi;
121 snd_rawmidi_substream_t *midi_output[SNDRV_SERIAL_MAX_OUTS];
122 snd_rawmidi_substream_t *midi_input[SNDRV_SERIAL_MAX_INS];
124 int filemode; //open status of file
126 spinlock_t open_lock;
131 struct resource *res_base;
134 unsigned int speed_base;
135 unsigned char divisor;
137 unsigned char old_divisor_lsb;
138 unsigned char old_divisor_msb;
139 unsigned char old_line_ctrl_reg;
141 // parameter for using of write loop
142 short int fifo_limit; //used in uart16550
143 short int fifo_count; //used in uart16550
150 unsigned char rstatus;
154 unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
156 // write buffer and its writing/reading position
157 unsigned char tx_buff[TX_BUFF_SIZE];
164 unsigned int timer_running:1;
165 struct timer_list buffer_timer;
169 static snd_card_t *snd_serial_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
171 inline static void snd_uart16550_add_timer(snd_uart16550_t *uart)
173 if (! uart->timer_running) {
174 /* timer 38600bps * 10bit * 16byte */
175 uart->buffer_timer.expires = jiffies + (HZ+255)/256;
176 uart->timer_running = 1;
177 add_timer(&uart->buffer_timer);
181 inline static void snd_uart16550_del_timer(snd_uart16550_t *uart)
183 if (uart->timer_running) {
184 del_timer(&uart->buffer_timer);
185 uart->timer_running = 0;
189 /* This macro is only used in snd_uart16550_io_loop */
190 inline static void snd_uart16550_buffer_output(snd_uart16550_t *uart)
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);
197 buff_out &= TX_BUFF_MASK;
198 uart->buff_out = buff_out;
199 uart->buff_in_count--;
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
207 static void snd_uart16550_io_loop(snd_uart16550_t * uart)
209 unsigned char c, status;
212 /* recall previous stream */
213 substream = uart->prev_in;
216 while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
217 /* while receive data ready */
218 c = inb(uart->base + UART_RX);
220 /* keep track of last status byte */
225 /* handle stream switch */
226 if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
227 if (uart->rstatus == 0xf5) {
228 if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
231 uart->rstatus = 0; /* prevent future bytes from being interpreted as streams */
233 else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
234 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
236 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
237 snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
240 if (status & UART_LSR_OE)
241 snd_printk("%s: Overrun on device at 0x%lx\n",
242 uart->rmidi->name, uart->base);
245 /* remember the last stream */
246 uart->prev_in = substream;
248 /* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
249 buffer is never filled. */
250 /* Check write status */
251 if (status & UART_LSR_THRE) {
252 uart->fifo_count = 0;
254 if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
255 || uart->adaptor == SNDRV_SERIAL_GENERIC) {
256 /* Can't use FIFO, must send only when CTS is true */
257 status = inb(uart->base + UART_MSR);
258 while( (uart->fifo_count == 0) && (status & UART_MSR_CTS) &&
259 (uart->buff_in_count > 0) ) {
260 snd_uart16550_buffer_output(uart);
261 status = inb( uart->base + UART_MSR );
265 while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
266 && uart->buff_in_count > 0) /* Do we want to? */
267 snd_uart16550_buffer_output(uart);
269 if (uart->irq < 0 && uart->buff_in_count > 0)
270 snd_uart16550_add_timer(uart);
273 /* NOTES ON SERVICING INTERUPTS
274 * ---------------------------
275 * After receiving a interrupt, it is important to indicate to the UART that
276 * this has been done.
277 * For a Rx interrupt, this is done by reading the received byte.
278 * For a Tx interrupt this is done by either:
281 * It is particularly important to read the IIR if a Tx interrupt is received
282 * when there is no data in tx_buff[], as in this case there no other
283 * indication that the interrupt has been serviced, and it remains outstanding
284 * indefinitely. This has the curious side effect that and no further interrupts
285 * will be generated from this device AT ALL!!.
286 * It is also desirable to clear outstanding interrupts when the device is
290 * Note that some devices need OUT2 to be set before they will generate
291 * interrupts at all. (Possibly tied to an internal pull-up on CTS?)
293 static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id, struct pt_regs *regs)
295 snd_uart16550_t *uart;
297 uart = (snd_uart16550_t *) dev_id;
298 spin_lock(&uart->open_lock);
299 if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
300 spin_unlock(&uart->open_lock);
303 inb(uart->base + UART_IIR); /* indicate to the UART that the interrupt has been serviced */
304 snd_uart16550_io_loop(uart);
305 spin_unlock(&uart->open_lock);
309 /* When the polling mode, this function calls snd_uart16550_io_loop. */
310 static void snd_uart16550_buffer_timer(unsigned long data)
312 snd_uart16550_t *uart;
314 uart = (snd_uart16550_t *)data;
315 spin_lock(&uart->open_lock);
316 snd_uart16550_del_timer(uart);
317 snd_uart16550_io_loop(uart);
318 spin_unlock(&uart->open_lock);
322 * this method probes, if an uart sits on given port
324 * return negative error if not found
326 static int __init snd_uart16550_detect(snd_uart16550_t *uart)
328 unsigned long io_base = uart->base;
332 /* Do some vague tests for the presence of the uart */
333 if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
334 return -ENODEV; /* Not configured */
337 uart->res_base = request_region(io_base, 8, "Serial MIDI");
338 if (uart->res_base == NULL) {
339 snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
343 ok = 1; /* uart detected unless one of the following tests should fail */
344 /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
345 outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
346 c = inb(io_base + UART_IER);
347 /* The top four bits of the IER should always == 0 */
351 outb(0xaa, io_base + UART_SCR);
352 /* Write arbitrary data into the scratch reg */
353 c = inb(io_base + UART_SCR);
354 /* If it comes back, it's OK */
358 outb(0x55, io_base + UART_SCR);
359 /* Write arbitrary data into the scratch reg */
360 c = inb(io_base + UART_SCR);
361 /* If it comes back, it's OK */
368 static void snd_uart16550_do_open(snd_uart16550_t * uart)
372 /* Initialize basic variables */
373 uart->buff_in_count = 0;
376 uart->fifo_limit = 1;
377 uart->fifo_count = 0;
378 uart->timer_running = 0;
380 outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
381 | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
382 | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
383 | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
384 /* NOTE: interrupt generated after T=(time)4-bytes
385 * if less than UART_FCR_TRIGGER bytes received
387 ,uart->base + UART_FCR); /* FIFO Control Register */
389 if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
390 uart->fifo_limit = 16;
391 if (uart->divisor != 0) {
392 uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
393 outb(UART_LCR_DLAB /* Divisor latch access bit */
394 ,uart->base + UART_LCR); /* Line Control Register */
395 uart->old_divisor_lsb = inb(uart->base + UART_DLL);
396 uart->old_divisor_msb = inb(uart->base + UART_DLM);
399 ,uart->base + UART_DLL); /* Divisor Latch Low */
401 ,uart->base + UART_DLM); /* Divisor Latch High */
402 /* DLAB is reset to 0 in next outb() */
404 /* Set serial parameters (parity off, etc) */
405 outb(UART_LCR_WLEN8 /* 8 data-bits */
409 ,uart->base + UART_LCR); /* Line Control Register */
411 switch (uart->adaptor) {
413 outb(UART_MCR_RTS /* Set Request-To-Send line active */
414 | UART_MCR_DTR /* Set Data-Terminal-Ready line active */
415 | UART_MCR_OUT2 /* Set OUT2 - not always required, but when
416 * it is, it is ESSENTIAL for enabling interrupts
418 ,uart->base + UART_MCR); /* Modem Control Register */
420 case SNDRV_SERIAL_MS124W_SA:
421 case SNDRV_SERIAL_MS124W_MB:
422 /* MS-124W can draw power from RTS and DTR if they
423 are in opposite states. */
424 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
425 uart->base + UART_MCR);
427 case SNDRV_SERIAL_MS124T:
428 /* MS-124T can draw power from RTS and/or DTR (preferably
429 both) if they are both asserted. */
430 outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
431 uart->base + UART_MCR);
436 byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
437 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
439 } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
440 byte = UART_IER_RDI /* Enable Receiver data interrupt */
441 | UART_IER_MSI /* Enable Modem status interrupt */
443 } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
444 byte = UART_IER_RDI /* Enable Receiver data interrupt */
445 | UART_IER_MSI /* Enable Modem status interrupt */
446 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
449 byte = UART_IER_RDI /* Enable Receiver data interrupt */
450 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
453 outb(byte, uart->base + UART_IER); /* Interupt enable Register */
455 inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
456 inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
457 inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
460 static void snd_uart16550_do_close(snd_uart16550_t * uart)
463 snd_uart16550_del_timer(uart);
465 /* NOTE: may need to disable interrupts before de-registering out handler.
466 * For now, the consequences are harmless.
469 outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
470 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
471 ,uart->base + UART_IER); /* Interupt enable Register */
473 switch (uart->adaptor) {
475 outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
476 |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
477 |(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
478 ,uart->base + UART_MCR); /* Modem Control Register */
480 case SNDRV_SERIAL_MS124W_SA:
481 case SNDRV_SERIAL_MS124W_MB:
482 /* MS-124W can draw power from RTS and DTR if they
483 are in opposite states; leave it powered. */
484 outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2),
485 uart->base + UART_MCR);
487 case SNDRV_SERIAL_MS124T:
488 /* MS-124T can draw power from RTS and/or DTR (preferably
489 both) if they are both asserted; leave it powered. */
490 outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2),
491 uart->base + UART_MCR);
495 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
497 /* Restore old divisor */
498 if (uart->divisor != 0) {
499 outb(UART_LCR_DLAB /* Divisor latch access bit */
500 ,uart->base + UART_LCR); /* Line Control Register */
501 outb(uart->old_divisor_lsb
502 ,uart->base + UART_DLL); /* Divisor Latch Low */
503 outb(uart->old_divisor_msb
504 ,uart->base + UART_DLM); /* Divisor Latch High */
505 /* Restore old LCR (data bits, stop bits, parity, DLAB) */
506 outb(uart->old_line_ctrl_reg
507 ,uart->base + UART_LCR); /* Line Control Register */
511 static int snd_uart16550_input_open(snd_rawmidi_substream_t * substream)
514 snd_uart16550_t *uart = substream->rmidi->private_data;
516 spin_lock_irqsave(&uart->open_lock, flags);
517 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
518 snd_uart16550_do_open(uart);
519 uart->filemode |= SERIAL_MODE_INPUT_OPEN;
520 uart->midi_input[substream->number] = substream;
521 spin_unlock_irqrestore(&uart->open_lock, flags);
525 static int snd_uart16550_input_close(snd_rawmidi_substream_t * substream)
528 snd_uart16550_t *uart = substream->rmidi->private_data;
530 spin_lock_irqsave(&uart->open_lock, flags);
531 uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
532 uart->midi_input[substream->number] = NULL;
533 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
534 snd_uart16550_do_close(uart);
535 spin_unlock_irqrestore(&uart->open_lock, flags);
539 static void snd_uart16550_input_trigger(snd_rawmidi_substream_t * substream, int up)
542 snd_uart16550_t *uart = substream->rmidi->private_data;
544 spin_lock_irqsave(&uart->open_lock, flags);
546 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
548 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
550 spin_unlock_irqrestore(&uart->open_lock, flags);
553 static int snd_uart16550_output_open(snd_rawmidi_substream_t * substream)
556 snd_uart16550_t *uart = substream->rmidi->private_data;
558 spin_lock_irqsave(&uart->open_lock, flags);
559 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
560 snd_uart16550_do_open(uart);
561 uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
562 uart->midi_output[substream->number] = substream;
563 spin_unlock_irqrestore(&uart->open_lock, flags);
567 static int snd_uart16550_output_close(snd_rawmidi_substream_t * substream)
570 snd_uart16550_t *uart = substream->rmidi->private_data;
572 spin_lock_irqsave(&uart->open_lock, flags);
573 uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
574 uart->midi_output[substream->number] = NULL;
575 if (uart->filemode == SERIAL_MODE_NOT_OPENED)
576 snd_uart16550_do_close(uart);
577 spin_unlock_irqrestore(&uart->open_lock, flags);
581 inline static int snd_uart16550_buffer_can_write( snd_uart16550_t *uart, int Num )
583 if( uart->buff_in_count + Num < TX_BUFF_SIZE )
589 inline static int snd_uart16550_write_buffer(snd_uart16550_t *uart, unsigned char byte)
591 unsigned short buff_in = uart->buff_in;
592 if( uart->buff_in_count < TX_BUFF_SIZE ) {
593 uart->tx_buff[buff_in] = byte;
595 buff_in &= TX_BUFF_MASK;
596 uart->buff_in = buff_in;
597 uart->buff_in_count++;
598 if (uart->irq < 0) /* polling mode */
599 snd_uart16550_add_timer(uart);
605 static int snd_uart16550_output_byte(snd_uart16550_t *uart, snd_rawmidi_substream_t * substream, unsigned char midi_byte)
607 if (uart->buff_in_count == 0 /* Buffer empty? */
608 && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
609 uart->adaptor != SNDRV_SERIAL_GENERIC) ||
610 (uart->fifo_count == 0 /* FIFO empty? */
611 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
613 /* Tx Buffer Empty - try to write immediately */
614 if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
615 /* Transmitter holding register (and Tx FIFO) empty */
616 uart->fifo_count = 1;
617 outb(midi_byte, uart->base + UART_TX);
619 if (uart->fifo_count < uart->fifo_limit) {
621 outb(midi_byte, uart->base + UART_TX);
623 /* Cannot write (buffer empty) - put char in buffer */
624 snd_uart16550_write_buffer(uart, midi_byte);
628 if( !snd_uart16550_write_buffer(uart, midi_byte) ) {
629 snd_printk("%s: Buffer overrun on device at 0x%lx\n",
630 uart->rmidi->name, uart->base);
638 static void snd_uart16550_output_write(snd_rawmidi_substream_t * substream)
641 unsigned char midi_byte, addr_byte;
642 snd_uart16550_t *uart = substream->rmidi->private_data;
644 static unsigned long lasttime=0;
646 /* Interupts are disabled during the updating of the tx_buff,
647 * since it is 'bad' to have two processes updating the same
648 * variables (ie buff_in & buff_out)
651 spin_lock_irqsave(&uart->open_lock, flags);
653 if (uart->irq < 0) //polling
654 snd_uart16550_io_loop(uart);
656 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
659 /* in this mode we need two bytes of space */
660 if (uart->buff_in_count > TX_BUFF_SIZE - 2)
662 if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
664 #ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
665 /* select exactly one of the four ports */
666 addr_byte = (1 << (substream->number + 4)) | 0x08;
668 /* select any combination of the four ports */
669 addr_byte = (substream->number << 4) | 0x08;
671 if (addr_byte == 0x08) addr_byte = 0xf8;
673 snd_uart16550_output_byte(uart, substream, addr_byte);
675 snd_uart16550_output_byte(uart, substream, midi_byte);
679 while( 1 == snd_rawmidi_transmit_peek(substream, &midi_byte, 1) ) {
680 /* Also send F5 after 3 seconds with no data to handle device disconnect */
681 if (first == 0 && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
682 uart->adaptor == SNDRV_SERIAL_GENERIC) &&
683 (uart->prev_out != substream->number || jiffies-lasttime > 3*HZ)) {
685 if( snd_uart16550_buffer_can_write( uart, 3 ) ) {
686 /* Roland Soundcanvas part selection */
687 /* If this substream of the data is different previous
688 substream in this uart, send the change part event */
689 uart->prev_out = substream->number;
691 snd_uart16550_output_byte(uart, substream, 0xf5);
693 snd_uart16550_output_byte(uart, substream, uart->prev_out + 1);
694 /* If midi_byte is a data byte, send the previous status byte */
695 if ((midi_byte < 0x80) && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS))
696 snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
697 } else if( !uart->drop_on_full )
703 if( !snd_uart16550_output_byte(uart, substream, midi_byte) && !uart->drop_on_full )
706 if (midi_byte >= 0x80 && midi_byte < 0xf0)
707 uart->prev_status[uart->prev_out] = midi_byte;
710 snd_rawmidi_transmit_ack( substream, 1 );
714 spin_unlock_irqrestore(&uart->open_lock, flags);
717 static void snd_uart16550_output_trigger(snd_rawmidi_substream_t * substream, int up)
720 snd_uart16550_t *uart = substream->rmidi->private_data;
722 spin_lock_irqsave(&uart->open_lock, flags);
724 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
726 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
728 spin_unlock_irqrestore(&uart->open_lock, flags);
730 snd_uart16550_output_write(substream);
733 static snd_rawmidi_ops_t snd_uart16550_output =
735 .open = snd_uart16550_output_open,
736 .close = snd_uart16550_output_close,
737 .trigger = snd_uart16550_output_trigger,
740 static snd_rawmidi_ops_t snd_uart16550_input =
742 .open = snd_uart16550_input_open,
743 .close = snd_uart16550_input_close,
744 .trigger = snd_uart16550_input_trigger,
747 static int snd_uart16550_free(snd_uart16550_t *uart)
750 free_irq(uart->irq, (void *)uart);
751 if (uart->res_base) {
752 release_resource(uart->res_base);
753 kfree_nocheck(uart->res_base);
759 static int snd_uart16550_dev_free(snd_device_t *device)
761 snd_uart16550_t *uart = device->device_data;
762 return snd_uart16550_free(uart);
765 static int __init snd_uart16550_create(snd_card_t * card,
766 unsigned long iobase,
772 snd_uart16550_t **ruart)
774 static snd_device_ops_t ops = {
775 .dev_free = snd_uart16550_dev_free,
777 snd_uart16550_t *uart;
781 if ((uart = kcalloc(1, sizeof(*uart), GFP_KERNEL)) == NULL)
783 uart->adaptor = adaptor;
785 spin_lock_init(&uart->open_lock);
788 uart->drop_on_full = droponfull;
790 if ((err = snd_uart16550_detect(uart)) <= 0) {
791 printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
795 if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
796 if (request_irq(irq, snd_uart16550_interrupt,
797 SA_INTERRUPT, "Serial MIDI", (void *) uart)) {
798 snd_printk("irq %d busy. Using Polling.\n", irq);
803 uart->divisor = base / speed;
804 uart->speed = base / (unsigned int)uart->divisor;
805 uart->speed_base = base;
809 memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
810 init_timer(&uart->buffer_timer);
811 uart->buffer_timer.function = snd_uart16550_buffer_timer;
812 uart->buffer_timer.data = (unsigned long)uart;
813 uart->timer_running = 0;
815 /* Register device */
816 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
817 snd_uart16550_free(uart);
821 switch (uart->adaptor) {
822 case SNDRV_SERIAL_MS124W_SA:
823 case SNDRV_SERIAL_MS124W_MB:
824 /* MS-124W can draw power from RTS and DTR if they
825 are in opposite states. */
826 outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
828 case SNDRV_SERIAL_MS124T:
829 /* MS-124T can draw power from RTS and/or DTR (preferably
830 both) if they are asserted. */
831 outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
843 static int __init snd_uart16550_rmidi(snd_uart16550_t *uart, int device, int outs, int ins, snd_rawmidi_t **rmidi)
845 snd_rawmidi_t *rrawmidi;
848 if ((err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, outs, ins, &rrawmidi)) < 0)
850 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_uart16550_input);
851 snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_uart16550_output);
852 sprintf(rrawmidi->name, "uart16550 MIDI #%d", device);
853 rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
854 SNDRV_RAWMIDI_INFO_INPUT |
855 SNDRV_RAWMIDI_INFO_DUPLEX;
856 rrawmidi->private_data = uart;
862 static int __init snd_serial_probe(int dev)
865 snd_uart16550_t *uart;
871 switch (adaptor[dev]) {
872 case SNDRV_SERIAL_SOUNDCANVAS:
875 case SNDRV_SERIAL_MS124T:
876 case SNDRV_SERIAL_MS124W_SA:
880 case SNDRV_SERIAL_MS124W_MB:
884 case SNDRV_SERIAL_GENERIC:
887 snd_printk("Adaptor type is out of range 0-%d (%d)\n",
888 SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
892 if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
893 snd_printk("Count of outputs is out of range 1-%d (%d)\n",
894 SNDRV_SERIAL_MAX_OUTS, outs[dev]);
898 if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) {
899 snd_printk("Count of inputs is out of range 1-%d (%d)\n",
900 SNDRV_SERIAL_MAX_INS, ins[dev]);
904 card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
908 strcpy(card->driver, "Serial");
909 strcpy(card->shortname, "Serial midi (uart16550A)");
911 if ((err = snd_uart16550_create(card,
923 if ((err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi)) < 0) {
928 sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d ins %d adaptor %s droponfull %d",
936 adaptor_names[uart->adaptor],
939 if ((err = snd_card_register(card)) < 0) {
943 snd_serial_cards[dev] = card;
947 static int __init alsa_card_serial_init(void)
952 for (dev = 0; dev < SNDRV_CARDS; dev++) {
953 if (snd_serial_probe(dev) == 0)
959 printk(KERN_ERR "serial midi soundcard not found or device busy\n");
966 static void __exit alsa_card_serial_exit(void)
970 for (dev = 0; dev < SNDRV_CARDS; dev++) {
971 if (snd_serial_cards[dev] != NULL)
972 snd_card_free(snd_serial_cards[dev]);
976 module_init(alsa_card_serial_init)
977 module_exit(alsa_card_serial_exit)