3
* Copyright (c) by Jaroslav Kysela <perex@perex.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.
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* More documentation can be found in serial-u16550.txt.
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 <sound/core.h>
41
#include <sound/rawmidi.h>
42
#include <sound/initval.h>
44
#include <linux/serial_reg.h>
45
#include <linux/jiffies.h>
49
MODULE_DESCRIPTION("MIDI serial u16550");
50
MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
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
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static char *adaptor_names[] = {
67
#define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
68
#define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
71
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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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 */
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static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
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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};
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static int droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
82
module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
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module_param_array(id, charp, NULL, 0444);
85
MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
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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.");
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module_param_array(irq, int, NULL, 0444);
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MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
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module_param_array(speed, int, NULL, 0444);
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MODULE_PARM_DESC(speed, "Speed in bauds.");
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module_param_array(base, int, NULL, 0444);
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MODULE_PARM_DESC(base, "Base for divisor in bauds.");
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module_param_array(outs, int, NULL, 0444);
97
MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
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module_param_array(ins, int, NULL, 0444);
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MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
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module_param_array(droponfull, bool, NULL, 0444);
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MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
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module_param_array(adaptor, int, NULL, 0444);
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MODULE_PARM_DESC(adaptor, "Type of adaptor.");
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/*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
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#define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
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#define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
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#define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
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#define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
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#define SERIAL_MODE_NOT_OPENED (0)
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#define SERIAL_MODE_INPUT_OPEN (1 << 0)
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#define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
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#define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
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#define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
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struct snd_uart16550 {
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struct snd_card *card;
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struct snd_rawmidi *rmidi;
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struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS];
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struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS];
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int filemode; /* open status of file */
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spinlock_t open_lock;
133
struct resource *res_base;
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unsigned int speed_base;
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unsigned char divisor;
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unsigned char old_divisor_lsb;
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unsigned char old_divisor_msb;
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unsigned char old_line_ctrl_reg;
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/* parameter for using of write loop */
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short int fifo_limit; /* used in uart16550 */
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short int fifo_count; /* used in uart16550 */
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/* type of adaptor */
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unsigned char rstatus;
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unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
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/* write buffer and its writing/reading position */
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unsigned char tx_buff[TX_BUFF_SIZE];
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unsigned int timer_running:1;
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struct timer_list buffer_timer;
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static struct platform_device *devices[SNDRV_CARDS];
173
static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart)
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);
183
static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart)
185
if (uart->timer_running) {
186
del_timer(&uart->buffer_timer);
187
uart->timer_running = 0;
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/* This macro is only used in snd_uart16550_io_loop */
192
static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart)
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);
199
buff_out &= TX_BUFF_MASK;
200
uart->buff_out = buff_out;
201
uart->buff_in_count--;
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
209
static void snd_uart16550_io_loop(struct snd_uart16550 * uart)
211
unsigned char c, status;
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/* recall previous stream */
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substream = uart->prev_in;
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while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
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/* while receive data ready */
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c = inb(uart->base + UART_RX);
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/* keep track of last status byte */
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/* handle stream switch */
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if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
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if (uart->rstatus == 0xf5) {
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if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
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/* prevent future bytes from being
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interpreted as streams */
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} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
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&& uart->midi_input[substream])
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snd_rawmidi_receive(uart->midi_input[substream],
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} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
240
uart->midi_input[substream])
241
snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
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if (status & UART_LSR_OE)
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snd_printk(KERN_WARNING
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"%s: Overrun on device at 0x%lx\n",
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uart->rmidi->name, uart->base);
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/* remember the last stream */
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uart->prev_in = substream;
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/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
253
buffer is never filled. */
254
/* Check write status */
255
if (status & UART_LSR_THRE)
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uart->fifo_count = 0;
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if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
258
|| uart->adaptor == SNDRV_SERIAL_GENERIC) {
259
/* Can't use FIFO, must send only when CTS is true */
260
status = inb(uart->base + UART_MSR);
261
while (uart->fifo_count == 0 && (status & UART_MSR_CTS) &&
262
uart->buff_in_count > 0) {
263
snd_uart16550_buffer_output(uart);
264
status = inb(uart->base + UART_MSR);
268
while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
269
&& uart->buff_in_count > 0) /* Do we want to? */
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snd_uart16550_buffer_output(uart);
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if (uart->irq < 0 && uart->buff_in_count > 0)
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snd_uart16550_add_timer(uart);
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/* NOTES ON SERVICING INTERUPTS
277
* ---------------------------
278
* After receiving a interrupt, it is important to indicate to the UART that
279
* this has been done.
280
* For a Rx interrupt, this is done by reading the received byte.
281
* For a Tx interrupt this is done by either:
284
* It is particularly important to read the IIR if a Tx interrupt is received
285
* when there is no data in tx_buff[], as in this case there no other
286
* indication that the interrupt has been serviced, and it remains outstanding
287
* indefinitely. This has the curious side effect that and no further interrupts
288
* will be generated from this device AT ALL!!.
289
* It is also desirable to clear outstanding interrupts when the device is
293
* Note that some devices need OUT2 to be set before they will generate
294
* interrupts at all. (Possibly tied to an internal pull-up on CTS?)
296
static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id)
298
struct snd_uart16550 *uart;
301
spin_lock(&uart->open_lock);
302
if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
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spin_unlock(&uart->open_lock);
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/* indicate to the UART that the interrupt has been serviced */
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inb(uart->base + UART_IIR);
308
snd_uart16550_io_loop(uart);
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spin_unlock(&uart->open_lock);
313
/* When the polling mode, this function calls snd_uart16550_io_loop. */
314
static void snd_uart16550_buffer_timer(unsigned long data)
317
struct snd_uart16550 *uart;
319
uart = (struct snd_uart16550 *)data;
320
spin_lock_irqsave(&uart->open_lock, flags);
321
snd_uart16550_del_timer(uart);
322
snd_uart16550_io_loop(uart);
323
spin_unlock_irqrestore(&uart->open_lock, flags);
327
* this method probes, if an uart sits on given port
329
* return negative error if not found
331
static int __devinit snd_uart16550_detect(struct snd_uart16550 *uart)
333
unsigned long io_base = uart->base;
337
/* Do some vague tests for the presence of the uart */
338
if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
339
return -ENODEV; /* Not configured */
342
uart->res_base = request_region(io_base, 8, "Serial MIDI");
343
if (uart->res_base == NULL) {
344
snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
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/* uart detected unless one of the following tests should fail */
350
/* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
351
outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
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c = inb(io_base + UART_IER);
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/* The top four bits of the IER should always == 0 */
357
outb(0xaa, io_base + UART_SCR);
358
/* Write arbitrary data into the scratch reg */
359
c = inb(io_base + UART_SCR);
360
/* If it comes back, it's OK */
364
outb(0x55, io_base + UART_SCR);
365
/* Write arbitrary data into the scratch reg */
366
c = inb(io_base + UART_SCR);
367
/* If it comes back, it's OK */
374
static void snd_uart16550_do_open(struct snd_uart16550 * uart)
378
/* Initialize basic variables */
379
uart->buff_in_count = 0;
382
uart->fifo_limit = 1;
383
uart->fifo_count = 0;
384
uart->timer_running = 0;
386
outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
387
| UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
388
| UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
389
| UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
390
/* NOTE: interrupt generated after T=(time)4-bytes
391
* if less than UART_FCR_TRIGGER bytes received
393
,uart->base + UART_FCR); /* FIFO Control Register */
395
if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
396
uart->fifo_limit = 16;
397
if (uart->divisor != 0) {
398
uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
399
outb(UART_LCR_DLAB /* Divisor latch access bit */
400
,uart->base + UART_LCR); /* Line Control Register */
401
uart->old_divisor_lsb = inb(uart->base + UART_DLL);
402
uart->old_divisor_msb = inb(uart->base + UART_DLM);
405
,uart->base + UART_DLL); /* Divisor Latch Low */
407
,uart->base + UART_DLM); /* Divisor Latch High */
408
/* DLAB is reset to 0 in next outb() */
410
/* Set serial parameters (parity off, etc) */
411
outb(UART_LCR_WLEN8 /* 8 data-bits */
415
,uart->base + UART_LCR); /* Line Control Register */
417
switch (uart->adaptor) {
419
outb(UART_MCR_RTS /* Set Request-To-Send line active */
420
| UART_MCR_DTR /* Set Data-Terminal-Ready line active */
421
| UART_MCR_OUT2 /* Set OUT2 - not always required, but when
422
* it is, it is ESSENTIAL for enabling interrupts
424
,uart->base + UART_MCR); /* Modem Control Register */
426
case SNDRV_SERIAL_MS124W_SA:
427
case SNDRV_SERIAL_MS124W_MB:
428
/* MS-124W can draw power from RTS and DTR if they
429
are in opposite states. */
430
outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
431
uart->base + UART_MCR);
433
case SNDRV_SERIAL_MS124T:
434
/* MS-124T can draw power from RTS and/or DTR (preferably
435
both) if they are both asserted. */
436
outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
437
uart->base + UART_MCR);
442
byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
443
|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
445
} else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
446
byte = UART_IER_RDI /* Enable Receiver data interrupt */
447
| UART_IER_MSI /* Enable Modem status interrupt */
449
} else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
450
byte = UART_IER_RDI /* Enable Receiver data interrupt */
451
| UART_IER_MSI /* Enable Modem status interrupt */
452
| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
455
byte = UART_IER_RDI /* Enable Receiver data interrupt */
456
| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
459
outb(byte, uart->base + UART_IER); /* Interrupt enable Register */
461
inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */
462
inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */
463
inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */
466
static void snd_uart16550_do_close(struct snd_uart16550 * uart)
469
snd_uart16550_del_timer(uart);
471
/* NOTE: may need to disable interrupts before de-registering out handler.
472
* For now, the consequences are harmless.
475
outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */
476
|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
477
,uart->base + UART_IER); /* Interrupt enable Register */
479
switch (uart->adaptor) {
481
outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */
482
|(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */
483
|(0 & UART_MCR_OUT2) /* Deactivate OUT2 */
484
,uart->base + UART_MCR); /* Modem Control Register */
486
case SNDRV_SERIAL_MS124W_SA:
487
case SNDRV_SERIAL_MS124W_MB:
488
/* MS-124W can draw power from RTS and DTR if they
489
are in opposite states; leave it powered. */
490
outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2),
491
uart->base + UART_MCR);
493
case SNDRV_SERIAL_MS124T:
494
/* MS-124T can draw power from RTS and/or DTR (preferably
495
both) if they are both asserted; leave it powered. */
496
outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2),
497
uart->base + UART_MCR);
501
inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */
503
/* Restore old divisor */
504
if (uart->divisor != 0) {
505
outb(UART_LCR_DLAB /* Divisor latch access bit */
506
,uart->base + UART_LCR); /* Line Control Register */
507
outb(uart->old_divisor_lsb
508
,uart->base + UART_DLL); /* Divisor Latch Low */
509
outb(uart->old_divisor_msb
510
,uart->base + UART_DLM); /* Divisor Latch High */
511
/* Restore old LCR (data bits, stop bits, parity, DLAB) */
512
outb(uart->old_line_ctrl_reg
513
,uart->base + UART_LCR); /* Line Control Register */
517
static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream)
520
struct snd_uart16550 *uart = substream->rmidi->private_data;
522
spin_lock_irqsave(&uart->open_lock, flags);
523
if (uart->filemode == SERIAL_MODE_NOT_OPENED)
524
snd_uart16550_do_open(uart);
525
uart->filemode |= SERIAL_MODE_INPUT_OPEN;
526
uart->midi_input[substream->number] = substream;
527
spin_unlock_irqrestore(&uart->open_lock, flags);
531
static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream)
534
struct snd_uart16550 *uart = substream->rmidi->private_data;
536
spin_lock_irqsave(&uart->open_lock, flags);
537
uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
538
uart->midi_input[substream->number] = NULL;
539
if (uart->filemode == SERIAL_MODE_NOT_OPENED)
540
snd_uart16550_do_close(uart);
541
spin_unlock_irqrestore(&uart->open_lock, flags);
545
static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream,
549
struct snd_uart16550 *uart = substream->rmidi->private_data;
551
spin_lock_irqsave(&uart->open_lock, flags);
553
uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
555
uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
556
spin_unlock_irqrestore(&uart->open_lock, flags);
559
static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream)
562
struct snd_uart16550 *uart = substream->rmidi->private_data;
564
spin_lock_irqsave(&uart->open_lock, flags);
565
if (uart->filemode == SERIAL_MODE_NOT_OPENED)
566
snd_uart16550_do_open(uart);
567
uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
568
uart->midi_output[substream->number] = substream;
569
spin_unlock_irqrestore(&uart->open_lock, flags);
573
static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream)
576
struct snd_uart16550 *uart = substream->rmidi->private_data;
578
spin_lock_irqsave(&uart->open_lock, flags);
579
uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
580
uart->midi_output[substream->number] = NULL;
581
if (uart->filemode == SERIAL_MODE_NOT_OPENED)
582
snd_uart16550_do_close(uart);
583
spin_unlock_irqrestore(&uart->open_lock, flags);
587
static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart,
590
if (uart->buff_in_count + Num < TX_BUFF_SIZE)
596
static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart,
599
unsigned short buff_in = uart->buff_in;
600
if (uart->buff_in_count < TX_BUFF_SIZE) {
601
uart->tx_buff[buff_in] = byte;
603
buff_in &= TX_BUFF_MASK;
604
uart->buff_in = buff_in;
605
uart->buff_in_count++;
606
if (uart->irq < 0) /* polling mode */
607
snd_uart16550_add_timer(uart);
613
static int snd_uart16550_output_byte(struct snd_uart16550 *uart,
614
struct snd_rawmidi_substream *substream,
615
unsigned char midi_byte)
617
if (uart->buff_in_count == 0 /* Buffer empty? */
618
&& ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
619
uart->adaptor != SNDRV_SERIAL_GENERIC) ||
620
(uart->fifo_count == 0 /* FIFO empty? */
621
&& (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */
623
/* Tx Buffer Empty - try to write immediately */
624
if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
625
/* Transmitter holding register (and Tx FIFO) empty */
626
uart->fifo_count = 1;
627
outb(midi_byte, uart->base + UART_TX);
629
if (uart->fifo_count < uart->fifo_limit) {
631
outb(midi_byte, uart->base + UART_TX);
633
/* Cannot write (buffer empty) -
634
* put char in buffer */
635
snd_uart16550_write_buffer(uart, midi_byte);
639
if (!snd_uart16550_write_buffer(uart, midi_byte)) {
640
snd_printk(KERN_WARNING
641
"%s: Buffer overrun on device at 0x%lx\n",
642
uart->rmidi->name, uart->base);
650
static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream)
653
unsigned char midi_byte, addr_byte;
654
struct snd_uart16550 *uart = substream->rmidi->private_data;
656
static unsigned long lasttime = 0;
658
/* Interrupts are disabled during the updating of the tx_buff,
659
* since it is 'bad' to have two processes updating the same
660
* variables (ie buff_in & buff_out)
663
spin_lock_irqsave(&uart->open_lock, flags);
665
if (uart->irq < 0) /* polling */
666
snd_uart16550_io_loop(uart);
668
if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
671
/* in this mode we need two bytes of space */
672
if (uart->buff_in_count > TX_BUFF_SIZE - 2)
674
if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
676
#ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
677
/* select exactly one of the four ports */
678
addr_byte = (1 << (substream->number + 4)) | 0x08;
680
/* select any combination of the four ports */
681
addr_byte = (substream->number << 4) | 0x08;
683
if (addr_byte == 0x08)
686
snd_uart16550_output_byte(uart, substream, addr_byte);
688
snd_uart16550_output_byte(uart, substream, midi_byte);
692
while (snd_rawmidi_transmit_peek(substream, &midi_byte, 1) == 1) {
693
/* Also send F5 after 3 seconds with no data
694
* to handle device disconnect */
696
(uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
697
uart->adaptor == SNDRV_SERIAL_GENERIC) &&
698
(uart->prev_out != substream->number ||
699
time_after(jiffies, lasttime + 3*HZ))) {
701
if (snd_uart16550_buffer_can_write(uart, 3)) {
702
/* Roland Soundcanvas part selection */
703
/* If this substream of the data is
704
* different previous substream
705
* in this uart, send the change part
708
uart->prev_out = substream->number;
710
snd_uart16550_output_byte(uart, substream,
713
snd_uart16550_output_byte(uart, substream,
715
/* If midi_byte is a data byte,
716
* send the previous status byte */
717
if (midi_byte < 0x80 &&
718
uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)
719
snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
720
} else if (!uart->drop_on_full)
726
if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&
727
!uart->drop_on_full )
730
if (midi_byte >= 0x80 && midi_byte < 0xf0)
731
uart->prev_status[uart->prev_out] = midi_byte;
734
snd_rawmidi_transmit_ack( substream, 1 );
738
spin_unlock_irqrestore(&uart->open_lock, flags);
741
static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream,
745
struct snd_uart16550 *uart = substream->rmidi->private_data;
747
spin_lock_irqsave(&uart->open_lock, flags);
749
uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
751
uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
752
spin_unlock_irqrestore(&uart->open_lock, flags);
754
snd_uart16550_output_write(substream);
757
static struct snd_rawmidi_ops snd_uart16550_output =
759
.open = snd_uart16550_output_open,
760
.close = snd_uart16550_output_close,
761
.trigger = snd_uart16550_output_trigger,
764
static struct snd_rawmidi_ops snd_uart16550_input =
766
.open = snd_uart16550_input_open,
767
.close = snd_uart16550_input_close,
768
.trigger = snd_uart16550_input_trigger,
771
static int snd_uart16550_free(struct snd_uart16550 *uart)
774
free_irq(uart->irq, uart);
775
release_and_free_resource(uart->res_base);
780
static int snd_uart16550_dev_free(struct snd_device *device)
782
struct snd_uart16550 *uart = device->device_data;
783
return snd_uart16550_free(uart);
786
static int __devinit snd_uart16550_create(struct snd_card *card,
787
unsigned long iobase,
793
struct snd_uart16550 **ruart)
795
static struct snd_device_ops ops = {
796
.dev_free = snd_uart16550_dev_free,
798
struct snd_uart16550 *uart;
802
if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL)
804
uart->adaptor = adaptor;
806
spin_lock_init(&uart->open_lock);
809
uart->drop_on_full = droponfull;
811
if ((err = snd_uart16550_detect(uart)) <= 0) {
812
printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
813
snd_uart16550_free(uart);
817
if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
818
if (request_irq(irq, snd_uart16550_interrupt,
819
0, "Serial MIDI", uart)) {
820
snd_printk(KERN_WARNING
821
"irq %d busy. Using Polling.\n", irq);
826
uart->divisor = base / speed;
827
uart->speed = base / (unsigned int)uart->divisor;
828
uart->speed_base = base;
832
memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
833
init_timer(&uart->buffer_timer);
834
uart->buffer_timer.function = snd_uart16550_buffer_timer;
835
uart->buffer_timer.data = (unsigned long)uart;
836
uart->timer_running = 0;
838
/* Register device */
839
if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
840
snd_uart16550_free(uart);
844
switch (uart->adaptor) {
845
case SNDRV_SERIAL_MS124W_SA:
846
case SNDRV_SERIAL_MS124W_MB:
847
/* MS-124W can draw power from RTS and DTR if they
848
are in opposite states. */
849
outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
851
case SNDRV_SERIAL_MS124T:
852
/* MS-124T can draw power from RTS and/or DTR (preferably
853
both) if they are asserted. */
854
outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
866
static void __devinit snd_uart16550_substreams(struct snd_rawmidi_str *stream)
868
struct snd_rawmidi_substream *substream;
870
list_for_each_entry(substream, &stream->substreams, list) {
871
sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
875
static int __devinit snd_uart16550_rmidi(struct snd_uart16550 *uart, int device,
877
struct snd_rawmidi **rmidi)
879
struct snd_rawmidi *rrawmidi;
882
err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device,
883
outs, ins, &rrawmidi);
886
snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT,
887
&snd_uart16550_input);
888
snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
889
&snd_uart16550_output);
890
strcpy(rrawmidi->name, "Serial MIDI");
891
snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
892
snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
893
rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
894
SNDRV_RAWMIDI_INFO_INPUT |
895
SNDRV_RAWMIDI_INFO_DUPLEX;
896
rrawmidi->private_data = uart;
902
static int __devinit snd_serial_probe(struct platform_device *devptr)
904
struct snd_card *card;
905
struct snd_uart16550 *uart;
907
int dev = devptr->id;
909
switch (adaptor[dev]) {
910
case SNDRV_SERIAL_SOUNDCANVAS:
913
case SNDRV_SERIAL_MS124T:
914
case SNDRV_SERIAL_MS124W_SA:
918
case SNDRV_SERIAL_MS124W_MB:
922
case SNDRV_SERIAL_GENERIC:
926
"Adaptor type is out of range 0-%d (%d)\n",
927
SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
931
if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
933
"Count of outputs is out of range 1-%d (%d)\n",
934
SNDRV_SERIAL_MAX_OUTS, outs[dev]);
938
if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) {
940
"Count of inputs is out of range 1-%d (%d)\n",
941
SNDRV_SERIAL_MAX_INS, ins[dev]);
945
err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
949
strcpy(card->driver, "Serial");
950
strcpy(card->shortname, "Serial MIDI (UART16550A)");
952
if ((err = snd_uart16550_create(card,
962
err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi);
966
sprintf(card->longname, "%s [%s] at %#lx, irq %d",
968
adaptor_names[uart->adaptor],
972
snd_card_set_dev(card, &devptr->dev);
974
if ((err = snd_card_register(card)) < 0)
977
platform_set_drvdata(devptr, card);
985
static int __devexit snd_serial_remove(struct platform_device *devptr)
987
snd_card_free(platform_get_drvdata(devptr));
988
platform_set_drvdata(devptr, NULL);
992
#define SND_SERIAL_DRIVER "snd_serial_u16550"
994
static struct platform_driver snd_serial_driver = {
995
.probe = snd_serial_probe,
996
.remove = __devexit_p( snd_serial_remove),
998
.name = SND_SERIAL_DRIVER
1002
static void snd_serial_unregister_all(void)
1006
for (i = 0; i < ARRAY_SIZE(devices); ++i)
1007
platform_device_unregister(devices[i]);
1008
platform_driver_unregister(&snd_serial_driver);
1011
static int __init alsa_card_serial_init(void)
1015
if ((err = platform_driver_register(&snd_serial_driver)) < 0)
1019
for (i = 0; i < SNDRV_CARDS; i++) {
1020
struct platform_device *device;
1023
device = platform_device_register_simple(SND_SERIAL_DRIVER,
1027
if (!platform_get_drvdata(device)) {
1028
platform_device_unregister(device);
1031
devices[i] = device;
1036
printk(KERN_ERR "serial midi soundcard not found or device busy\n");
1038
snd_serial_unregister_all();
1044
static void __exit alsa_card_serial_exit(void)
1046
snd_serial_unregister_all();
1049
module_init(alsa_card_serial_init)
1050
module_exit(alsa_card_serial_exit)