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1da177e4 LT |
1 | /* |
2 | * serial.c | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.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 <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> | |
42 | ||
43 | #include <linux/serial_reg.h> | |
44 | ||
45 | #include <asm/io.h> | |
46 | ||
47 | MODULE_DESCRIPTION("MIDI serial u16550"); | |
48 | MODULE_LICENSE("GPL"); | |
49 | MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}"); | |
50 | ||
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[] = { | |
58 | "Soundcanvas", | |
59 | "MS-124T", | |
60 | "MS-124W S/A", | |
61 | "MS-124W M/B", | |
62 | "Generic" | |
63 | }; | |
64 | ||
65 | #define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */ | |
66 | #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */ | |
67 | ||
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 }; | |
79 | ||
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"); | |
100 | ||
101 | module_param_array(adaptor, int, NULL, 0444); | |
102 | MODULE_PARM_DESC(adaptor, "Type of adaptor."); | |
103 | ||
104 | /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */ | |
105 | ||
106 | #define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */ | |
107 | #define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */ | |
108 | ||
109 | #define TX_BUFF_SIZE (1<<15) /* Must be 2^n */ | |
110 | #define TX_BUFF_MASK (TX_BUFF_SIZE - 1) | |
111 | ||
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) | |
117 | ||
118 | typedef struct _snd_uart16550 { | |
119 | snd_card_t *card; | |
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]; | |
123 | ||
124 | int filemode; //open status of file | |
125 | ||
126 | spinlock_t open_lock; | |
127 | ||
128 | int irq; | |
129 | ||
130 | unsigned long base; | |
131 | struct resource *res_base; | |
132 | ||
133 | unsigned int speed; | |
134 | unsigned int speed_base; | |
135 | unsigned char divisor; | |
136 | ||
137 | unsigned char old_divisor_lsb; | |
138 | unsigned char old_divisor_msb; | |
139 | unsigned char old_line_ctrl_reg; | |
140 | ||
141 | // parameter for using of write loop | |
142 | short int fifo_limit; //used in uart16550 | |
143 | short int fifo_count; //used in uart16550 | |
144 | ||
145 | // type of adaptor | |
146 | int adaptor; | |
147 | ||
148 | // inputs | |
149 | int prev_in; | |
150 | unsigned char rstatus; | |
151 | ||
152 | // outputs | |
153 | int prev_out; | |
154 | unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS]; | |
155 | ||
156 | // write buffer and its writing/reading position | |
157 | unsigned char tx_buff[TX_BUFF_SIZE]; | |
158 | int buff_in_count; | |
159 | int buff_in; | |
160 | int buff_out; | |
161 | int drop_on_full; | |
162 | ||
163 | // wait timer | |
164 | unsigned int timer_running:1; | |
165 | struct timer_list buffer_timer; | |
166 | ||
167 | } snd_uart16550_t; | |
168 | ||
169 | static snd_card_t *snd_serial_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR; | |
170 | ||
77933d72 | 171 | static inline void snd_uart16550_add_timer(snd_uart16550_t *uart) |
1da177e4 LT |
172 | { |
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); | |
178 | } | |
179 | } | |
180 | ||
77933d72 | 181 | static inline void snd_uart16550_del_timer(snd_uart16550_t *uart) |
1da177e4 LT |
182 | { |
183 | if (uart->timer_running) { | |
184 | del_timer(&uart->buffer_timer); | |
185 | uart->timer_running = 0; | |
186 | } | |
187 | } | |
188 | ||
189 | /* This macro is only used in snd_uart16550_io_loop */ | |
77933d72 | 190 | static inline void snd_uart16550_buffer_output(snd_uart16550_t *uart) |
1da177e4 LT |
191 | { |
192 | unsigned short buff_out = uart->buff_out; | |
193 | if( uart->buff_in_count > 0 ) { | |
194 | outb(uart->tx_buff[buff_out], uart->base + UART_TX); | |
195 | uart->fifo_count++; | |
196 | buff_out++; | |
197 | buff_out &= TX_BUFF_MASK; | |
198 | uart->buff_out = buff_out; | |
199 | uart->buff_in_count--; | |
200 | } | |
201 | } | |
202 | ||
203 | /* This loop should be called with interrupts disabled | |
204 | * We don't want to interrupt this, | |
205 | * as we're already handling an interrupt | |
206 | */ | |
207 | static void snd_uart16550_io_loop(snd_uart16550_t * uart) | |
208 | { | |
209 | unsigned char c, status; | |
210 | int substream; | |
211 | ||
212 | /* recall previous stream */ | |
213 | substream = uart->prev_in; | |
214 | ||
215 | /* Read Loop */ | |
216 | while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) { | |
217 | /* while receive data ready */ | |
218 | c = inb(uart->base + UART_RX); | |
219 | ||
220 | /* keep track of last status byte */ | |
221 | if (c & 0x80) { | |
222 | uart->rstatus = c; | |
223 | } | |
224 | ||
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) | |
229 | substream = c - 1; | |
230 | if (c != 0xf5) | |
231 | uart->rstatus = 0; /* prevent future bytes from being interpreted as streams */ | |
232 | } | |
233 | else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) { | |
234 | snd_rawmidi_receive(uart->midi_input[substream], &c, 1); | |
235 | } | |
236 | } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) { | |
237 | snd_rawmidi_receive(uart->midi_input[substream], &c, 1); | |
238 | } | |
239 | ||
240 | if (status & UART_LSR_OE) | |
241 | snd_printk("%s: Overrun on device at 0x%lx\n", | |
242 | uart->rmidi->name, uart->base); | |
243 | } | |
244 | ||
245 | /* remember the last stream */ | |
246 | uart->prev_in = substream; | |
247 | ||
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; | |
253 | } | |
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 ); | |
262 | } | |
263 | } else { | |
264 | /* Write loop */ | |
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); | |
268 | } | |
269 | if (uart->irq < 0 && uart->buff_in_count > 0) | |
270 | snd_uart16550_add_timer(uart); | |
271 | } | |
272 | ||
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: | |
279 | * a) Writing a byte | |
280 | * b) Reading the IIR | |
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 | |
287 | * opened/closed. | |
288 | * | |
289 | * | |
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?) | |
292 | */ | |
293 | static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
294 | { | |
295 | snd_uart16550_t *uart; | |
296 | ||
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); | |
301 | return IRQ_NONE; | |
302 | } | |
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); | |
306 | return IRQ_HANDLED; | |
307 | } | |
308 | ||
309 | /* When the polling mode, this function calls snd_uart16550_io_loop. */ | |
310 | static void snd_uart16550_buffer_timer(unsigned long data) | |
311 | { | |
312 | unsigned long flags; | |
313 | snd_uart16550_t *uart; | |
314 | ||
315 | uart = (snd_uart16550_t *)data; | |
316 | spin_lock_irqsave(&uart->open_lock, flags); | |
317 | snd_uart16550_del_timer(uart); | |
318 | snd_uart16550_io_loop(uart); | |
319 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
320 | } | |
321 | ||
322 | /* | |
323 | * this method probes, if an uart sits on given port | |
324 | * return 0 if found | |
325 | * return negative error if not found | |
326 | */ | |
327 | static int __init snd_uart16550_detect(snd_uart16550_t *uart) | |
328 | { | |
329 | unsigned long io_base = uart->base; | |
330 | int ok; | |
331 | unsigned char c; | |
332 | ||
333 | /* Do some vague tests for the presence of the uart */ | |
334 | if (io_base == 0 || io_base == SNDRV_AUTO_PORT) { | |
335 | return -ENODEV; /* Not configured */ | |
336 | } | |
337 | ||
338 | uart->res_base = request_region(io_base, 8, "Serial MIDI"); | |
339 | if (uart->res_base == NULL) { | |
340 | snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base); | |
341 | return -EBUSY; | |
342 | } | |
343 | ||
344 | ok = 1; /* uart detected unless one of the following tests should fail */ | |
345 | /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */ | |
346 | outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */ | |
347 | c = inb(io_base + UART_IER); | |
348 | /* The top four bits of the IER should always == 0 */ | |
349 | if ((c & 0xf0) != 0) | |
350 | ok = 0; /* failed */ | |
351 | ||
352 | outb(0xaa, io_base + UART_SCR); | |
353 | /* Write arbitrary data into the scratch reg */ | |
354 | c = inb(io_base + UART_SCR); | |
355 | /* If it comes back, it's OK */ | |
356 | if (c != 0xaa) | |
357 | ok = 0; /* failed */ | |
358 | ||
359 | outb(0x55, io_base + UART_SCR); | |
360 | /* Write arbitrary data into the scratch reg */ | |
361 | c = inb(io_base + UART_SCR); | |
362 | /* If it comes back, it's OK */ | |
363 | if (c != 0x55) | |
364 | ok = 0; /* failed */ | |
365 | ||
366 | return ok; | |
367 | } | |
368 | ||
369 | static void snd_uart16550_do_open(snd_uart16550_t * uart) | |
370 | { | |
371 | char byte; | |
372 | ||
373 | /* Initialize basic variables */ | |
374 | uart->buff_in_count = 0; | |
375 | uart->buff_in = 0; | |
376 | uart->buff_out = 0; | |
377 | uart->fifo_limit = 1; | |
378 | uart->fifo_count = 0; | |
379 | uart->timer_running = 0; | |
380 | ||
381 | outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */ | |
382 | | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */ | |
383 | | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */ | |
384 | | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */ | |
385 | /* NOTE: interrupt generated after T=(time)4-bytes | |
386 | * if less than UART_FCR_TRIGGER bytes received | |
387 | */ | |
388 | ,uart->base + UART_FCR); /* FIFO Control Register */ | |
389 | ||
390 | if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0) | |
391 | uart->fifo_limit = 16; | |
392 | if (uart->divisor != 0) { | |
393 | uart->old_line_ctrl_reg = inb(uart->base + UART_LCR); | |
394 | outb(UART_LCR_DLAB /* Divisor latch access bit */ | |
395 | ,uart->base + UART_LCR); /* Line Control Register */ | |
396 | uart->old_divisor_lsb = inb(uart->base + UART_DLL); | |
397 | uart->old_divisor_msb = inb(uart->base + UART_DLM); | |
398 | ||
399 | outb(uart->divisor | |
400 | ,uart->base + UART_DLL); /* Divisor Latch Low */ | |
401 | outb(0 | |
402 | ,uart->base + UART_DLM); /* Divisor Latch High */ | |
403 | /* DLAB is reset to 0 in next outb() */ | |
404 | } | |
405 | /* Set serial parameters (parity off, etc) */ | |
406 | outb(UART_LCR_WLEN8 /* 8 data-bits */ | |
407 | | 0 /* 1 stop-bit */ | |
408 | | 0 /* parity off */ | |
409 | | 0 /* DLAB = 0 */ | |
410 | ,uart->base + UART_LCR); /* Line Control Register */ | |
411 | ||
412 | switch (uart->adaptor) { | |
413 | default: | |
414 | outb(UART_MCR_RTS /* Set Request-To-Send line active */ | |
415 | | UART_MCR_DTR /* Set Data-Terminal-Ready line active */ | |
416 | | UART_MCR_OUT2 /* Set OUT2 - not always required, but when | |
417 | * it is, it is ESSENTIAL for enabling interrupts | |
418 | */ | |
419 | ,uart->base + UART_MCR); /* Modem Control Register */ | |
420 | break; | |
421 | case SNDRV_SERIAL_MS124W_SA: | |
422 | case SNDRV_SERIAL_MS124W_MB: | |
423 | /* MS-124W can draw power from RTS and DTR if they | |
424 | are in opposite states. */ | |
425 | outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2, | |
426 | uart->base + UART_MCR); | |
427 | break; | |
428 | case SNDRV_SERIAL_MS124T: | |
429 | /* MS-124T can draw power from RTS and/or DTR (preferably | |
430 | both) if they are both asserted. */ | |
431 | outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2, | |
432 | uart->base + UART_MCR); | |
433 | break; | |
434 | } | |
435 | ||
436 | if (uart->irq < 0) { | |
437 | byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */ | |
438 | |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */ | |
439 | ; | |
440 | } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) { | |
441 | byte = UART_IER_RDI /* Enable Receiver data interrupt */ | |
442 | | UART_IER_MSI /* Enable Modem status interrupt */ | |
443 | ; | |
444 | } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) { | |
445 | byte = UART_IER_RDI /* Enable Receiver data interrupt */ | |
446 | | UART_IER_MSI /* Enable Modem status interrupt */ | |
447 | | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */ | |
448 | ; | |
449 | } else { | |
450 | byte = UART_IER_RDI /* Enable Receiver data interrupt */ | |
451 | | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */ | |
452 | ; | |
453 | } | |
454 | outb(byte, uart->base + UART_IER); /* Interupt enable Register */ | |
455 | ||
456 | inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */ | |
457 | inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */ | |
458 | inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */ | |
459 | } | |
460 | ||
461 | static void snd_uart16550_do_close(snd_uart16550_t * uart) | |
462 | { | |
463 | if (uart->irq < 0) | |
464 | snd_uart16550_del_timer(uart); | |
465 | ||
466 | /* NOTE: may need to disable interrupts before de-registering out handler. | |
467 | * For now, the consequences are harmless. | |
468 | */ | |
469 | ||
470 | outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */ | |
471 | |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */ | |
472 | ,uart->base + UART_IER); /* Interupt enable Register */ | |
473 | ||
474 | switch (uart->adaptor) { | |
475 | default: | |
476 | outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */ | |
477 | |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */ | |
478 | |(0 & UART_MCR_OUT2) /* Deactivate OUT2 */ | |
479 | ,uart->base + UART_MCR); /* Modem Control Register */ | |
480 | break; | |
481 | case SNDRV_SERIAL_MS124W_SA: | |
482 | case SNDRV_SERIAL_MS124W_MB: | |
483 | /* MS-124W can draw power from RTS and DTR if they | |
484 | are in opposite states; leave it powered. */ | |
485 | outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2), | |
486 | uart->base + UART_MCR); | |
487 | break; | |
488 | case SNDRV_SERIAL_MS124T: | |
489 | /* MS-124T can draw power from RTS and/or DTR (preferably | |
490 | both) if they are both asserted; leave it powered. */ | |
491 | outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2), | |
492 | uart->base + UART_MCR); | |
493 | break; | |
494 | } | |
495 | ||
496 | inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */ | |
497 | ||
498 | /* Restore old divisor */ | |
499 | if (uart->divisor != 0) { | |
500 | outb(UART_LCR_DLAB /* Divisor latch access bit */ | |
501 | ,uart->base + UART_LCR); /* Line Control Register */ | |
502 | outb(uart->old_divisor_lsb | |
503 | ,uart->base + UART_DLL); /* Divisor Latch Low */ | |
504 | outb(uart->old_divisor_msb | |
505 | ,uart->base + UART_DLM); /* Divisor Latch High */ | |
506 | /* Restore old LCR (data bits, stop bits, parity, DLAB) */ | |
507 | outb(uart->old_line_ctrl_reg | |
508 | ,uart->base + UART_LCR); /* Line Control Register */ | |
509 | } | |
510 | } | |
511 | ||
512 | static int snd_uart16550_input_open(snd_rawmidi_substream_t * substream) | |
513 | { | |
514 | unsigned long flags; | |
515 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
516 | ||
517 | spin_lock_irqsave(&uart->open_lock, flags); | |
518 | if (uart->filemode == SERIAL_MODE_NOT_OPENED) | |
519 | snd_uart16550_do_open(uart); | |
520 | uart->filemode |= SERIAL_MODE_INPUT_OPEN; | |
521 | uart->midi_input[substream->number] = substream; | |
522 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static int snd_uart16550_input_close(snd_rawmidi_substream_t * substream) | |
527 | { | |
528 | unsigned long flags; | |
529 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
530 | ||
531 | spin_lock_irqsave(&uart->open_lock, flags); | |
532 | uart->filemode &= ~SERIAL_MODE_INPUT_OPEN; | |
533 | uart->midi_input[substream->number] = NULL; | |
534 | if (uart->filemode == SERIAL_MODE_NOT_OPENED) | |
535 | snd_uart16550_do_close(uart); | |
536 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
537 | return 0; | |
538 | } | |
539 | ||
540 | static void snd_uart16550_input_trigger(snd_rawmidi_substream_t * substream, int up) | |
541 | { | |
542 | unsigned long flags; | |
543 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
544 | ||
545 | spin_lock_irqsave(&uart->open_lock, flags); | |
546 | if (up) { | |
547 | uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED; | |
548 | } else { | |
549 | uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED; | |
550 | } | |
551 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
552 | } | |
553 | ||
554 | static int snd_uart16550_output_open(snd_rawmidi_substream_t * substream) | |
555 | { | |
556 | unsigned long flags; | |
557 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
558 | ||
559 | spin_lock_irqsave(&uart->open_lock, flags); | |
560 | if (uart->filemode == SERIAL_MODE_NOT_OPENED) | |
561 | snd_uart16550_do_open(uart); | |
562 | uart->filemode |= SERIAL_MODE_OUTPUT_OPEN; | |
563 | uart->midi_output[substream->number] = substream; | |
564 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
565 | return 0; | |
566 | }; | |
567 | ||
568 | static int snd_uart16550_output_close(snd_rawmidi_substream_t * substream) | |
569 | { | |
570 | unsigned long flags; | |
571 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
572 | ||
573 | spin_lock_irqsave(&uart->open_lock, flags); | |
574 | uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN; | |
575 | uart->midi_output[substream->number] = NULL; | |
576 | if (uart->filemode == SERIAL_MODE_NOT_OPENED) | |
577 | snd_uart16550_do_close(uart); | |
578 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
579 | return 0; | |
580 | }; | |
581 | ||
77933d72 | 582 | static inline int snd_uart16550_buffer_can_write( snd_uart16550_t *uart, int Num ) |
1da177e4 LT |
583 | { |
584 | if( uart->buff_in_count + Num < TX_BUFF_SIZE ) | |
585 | return 1; | |
586 | else | |
587 | return 0; | |
588 | } | |
589 | ||
77933d72 | 590 | static inline int snd_uart16550_write_buffer(snd_uart16550_t *uart, unsigned char byte) |
1da177e4 LT |
591 | { |
592 | unsigned short buff_in = uart->buff_in; | |
593 | if( uart->buff_in_count < TX_BUFF_SIZE ) { | |
594 | uart->tx_buff[buff_in] = byte; | |
595 | buff_in++; | |
596 | buff_in &= TX_BUFF_MASK; | |
597 | uart->buff_in = buff_in; | |
598 | uart->buff_in_count++; | |
599 | if (uart->irq < 0) /* polling mode */ | |
600 | snd_uart16550_add_timer(uart); | |
601 | return 1; | |
602 | } else | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static int snd_uart16550_output_byte(snd_uart16550_t *uart, snd_rawmidi_substream_t * substream, unsigned char midi_byte) | |
607 | { | |
608 | if (uart->buff_in_count == 0 /* Buffer empty? */ | |
609 | && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA && | |
610 | uart->adaptor != SNDRV_SERIAL_GENERIC) || | |
611 | (uart->fifo_count == 0 /* FIFO empty? */ | |
612 | && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */ | |
613 | ||
614 | /* Tx Buffer Empty - try to write immediately */ | |
615 | if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) { | |
616 | /* Transmitter holding register (and Tx FIFO) empty */ | |
617 | uart->fifo_count = 1; | |
618 | outb(midi_byte, uart->base + UART_TX); | |
619 | } else { | |
620 | if (uart->fifo_count < uart->fifo_limit) { | |
621 | uart->fifo_count++; | |
622 | outb(midi_byte, uart->base + UART_TX); | |
623 | } else { | |
624 | /* Cannot write (buffer empty) - put char in buffer */ | |
625 | snd_uart16550_write_buffer(uart, midi_byte); | |
626 | } | |
627 | } | |
628 | } else { | |
629 | if( !snd_uart16550_write_buffer(uart, midi_byte) ) { | |
630 | snd_printk("%s: Buffer overrun on device at 0x%lx\n", | |
631 | uart->rmidi->name, uart->base); | |
632 | return 0; | |
633 | } | |
634 | } | |
635 | ||
636 | return 1; | |
637 | } | |
638 | ||
639 | static void snd_uart16550_output_write(snd_rawmidi_substream_t * substream) | |
640 | { | |
641 | unsigned long flags; | |
642 | unsigned char midi_byte, addr_byte; | |
643 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
644 | char first; | |
645 | static unsigned long lasttime=0; | |
646 | ||
647 | /* Interupts are disabled during the updating of the tx_buff, | |
648 | * since it is 'bad' to have two processes updating the same | |
649 | * variables (ie buff_in & buff_out) | |
650 | */ | |
651 | ||
652 | spin_lock_irqsave(&uart->open_lock, flags); | |
653 | ||
654 | if (uart->irq < 0) //polling | |
655 | snd_uart16550_io_loop(uart); | |
656 | ||
657 | if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) { | |
658 | while (1) { | |
659 | /* buffer full? */ | |
660 | /* in this mode we need two bytes of space */ | |
661 | if (uart->buff_in_count > TX_BUFF_SIZE - 2) | |
662 | break; | |
663 | if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1) | |
664 | break; | |
665 | #ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO | |
666 | /* select exactly one of the four ports */ | |
667 | addr_byte = (1 << (substream->number + 4)) | 0x08; | |
668 | #else | |
669 | /* select any combination of the four ports */ | |
670 | addr_byte = (substream->number << 4) | 0x08; | |
671 | /* ...except none */ | |
672 | if (addr_byte == 0x08) addr_byte = 0xf8; | |
673 | #endif | |
674 | snd_uart16550_output_byte(uart, substream, addr_byte); | |
675 | /* send midi byte */ | |
676 | snd_uart16550_output_byte(uart, substream, midi_byte); | |
677 | } | |
678 | } else { | |
679 | first = 0; | |
680 | while( 1 == snd_rawmidi_transmit_peek(substream, &midi_byte, 1) ) { | |
681 | /* Also send F5 after 3 seconds with no data to handle device disconnect */ | |
682 | if (first == 0 && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS || | |
683 | uart->adaptor == SNDRV_SERIAL_GENERIC) && | |
684 | (uart->prev_out != substream->number || jiffies-lasttime > 3*HZ)) { | |
685 | ||
686 | if( snd_uart16550_buffer_can_write( uart, 3 ) ) { | |
687 | /* Roland Soundcanvas part selection */ | |
688 | /* If this substream of the data is different previous | |
689 | substream in this uart, send the change part event */ | |
690 | uart->prev_out = substream->number; | |
691 | /* change part */ | |
692 | snd_uart16550_output_byte(uart, substream, 0xf5); | |
693 | /* data */ | |
694 | snd_uart16550_output_byte(uart, substream, uart->prev_out + 1); | |
695 | /* If midi_byte is a data byte, send the previous status byte */ | |
696 | if ((midi_byte < 0x80) && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS)) | |
697 | snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]); | |
698 | } else if( !uart->drop_on_full ) | |
699 | break; | |
700 | ||
701 | } | |
702 | ||
703 | /* send midi byte */ | |
704 | if( !snd_uart16550_output_byte(uart, substream, midi_byte) && !uart->drop_on_full ) | |
705 | break; | |
706 | ||
707 | if (midi_byte >= 0x80 && midi_byte < 0xf0) | |
708 | uart->prev_status[uart->prev_out] = midi_byte; | |
709 | first = 1; | |
710 | ||
711 | snd_rawmidi_transmit_ack( substream, 1 ); | |
712 | } | |
713 | lasttime = jiffies; | |
714 | } | |
715 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
716 | } | |
717 | ||
718 | static void snd_uart16550_output_trigger(snd_rawmidi_substream_t * substream, int up) | |
719 | { | |
720 | unsigned long flags; | |
721 | snd_uart16550_t *uart = substream->rmidi->private_data; | |
722 | ||
723 | spin_lock_irqsave(&uart->open_lock, flags); | |
724 | if (up) { | |
725 | uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED; | |
726 | } else { | |
727 | uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED; | |
728 | } | |
729 | spin_unlock_irqrestore(&uart->open_lock, flags); | |
730 | if (up) | |
731 | snd_uart16550_output_write(substream); | |
732 | } | |
733 | ||
734 | static snd_rawmidi_ops_t snd_uart16550_output = | |
735 | { | |
736 | .open = snd_uart16550_output_open, | |
737 | .close = snd_uart16550_output_close, | |
738 | .trigger = snd_uart16550_output_trigger, | |
739 | }; | |
740 | ||
741 | static snd_rawmidi_ops_t snd_uart16550_input = | |
742 | { | |
743 | .open = snd_uart16550_input_open, | |
744 | .close = snd_uart16550_input_close, | |
745 | .trigger = snd_uart16550_input_trigger, | |
746 | }; | |
747 | ||
748 | static int snd_uart16550_free(snd_uart16550_t *uart) | |
749 | { | |
750 | if (uart->irq >= 0) | |
751 | free_irq(uart->irq, (void *)uart); | |
752 | if (uart->res_base) { | |
753 | release_resource(uart->res_base); | |
754 | kfree_nocheck(uart->res_base); | |
755 | } | |
756 | kfree(uart); | |
757 | return 0; | |
758 | }; | |
759 | ||
760 | static int snd_uart16550_dev_free(snd_device_t *device) | |
761 | { | |
762 | snd_uart16550_t *uart = device->device_data; | |
763 | return snd_uart16550_free(uart); | |
764 | } | |
765 | ||
766 | static int __init snd_uart16550_create(snd_card_t * card, | |
767 | unsigned long iobase, | |
768 | int irq, | |
769 | unsigned int speed, | |
770 | unsigned int base, | |
771 | int adaptor, | |
772 | int droponfull, | |
773 | snd_uart16550_t **ruart) | |
774 | { | |
775 | static snd_device_ops_t ops = { | |
776 | .dev_free = snd_uart16550_dev_free, | |
777 | }; | |
778 | snd_uart16550_t *uart; | |
779 | int err; | |
780 | ||
781 | ||
561b220a | 782 | if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL) |
1da177e4 LT |
783 | return -ENOMEM; |
784 | uart->adaptor = adaptor; | |
785 | uart->card = card; | |
786 | spin_lock_init(&uart->open_lock); | |
787 | uart->irq = -1; | |
788 | uart->base = iobase; | |
789 | uart->drop_on_full = droponfull; | |
790 | ||
791 | if ((err = snd_uart16550_detect(uart)) <= 0) { | |
792 | printk(KERN_ERR "no UART detected at 0x%lx\n", iobase); | |
793 | return err; | |
794 | } | |
795 | ||
796 | if (irq >= 0 && irq != SNDRV_AUTO_IRQ) { | |
797 | if (request_irq(irq, snd_uart16550_interrupt, | |
798 | SA_INTERRUPT, "Serial MIDI", (void *) uart)) { | |
799 | snd_printk("irq %d busy. Using Polling.\n", irq); | |
800 | } else { | |
801 | uart->irq = irq; | |
802 | } | |
803 | } | |
804 | uart->divisor = base / speed; | |
805 | uart->speed = base / (unsigned int)uart->divisor; | |
806 | uart->speed_base = base; | |
807 | uart->prev_out = -1; | |
808 | uart->prev_in = 0; | |
809 | uart->rstatus = 0; | |
810 | memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS); | |
811 | init_timer(&uart->buffer_timer); | |
812 | uart->buffer_timer.function = snd_uart16550_buffer_timer; | |
813 | uart->buffer_timer.data = (unsigned long)uart; | |
814 | uart->timer_running = 0; | |
815 | ||
816 | /* Register device */ | |
817 | if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) { | |
818 | snd_uart16550_free(uart); | |
819 | return err; | |
820 | } | |
821 | ||
822 | switch (uart->adaptor) { | |
823 | case SNDRV_SERIAL_MS124W_SA: | |
824 | case SNDRV_SERIAL_MS124W_MB: | |
825 | /* MS-124W can draw power from RTS and DTR if they | |
826 | are in opposite states. */ | |
827 | outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR); | |
828 | break; | |
829 | case SNDRV_SERIAL_MS124T: | |
830 | /* MS-124T can draw power from RTS and/or DTR (preferably | |
831 | both) if they are asserted. */ | |
832 | outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR); | |
833 | break; | |
834 | default: | |
835 | break; | |
836 | } | |
837 | ||
838 | if (ruart) | |
839 | *ruart = uart; | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static void __init snd_uart16550_substreams(snd_rawmidi_str_t *stream) | |
845 | { | |
846 | struct list_head *list; | |
847 | ||
848 | list_for_each(list, &stream->substreams) { | |
849 | snd_rawmidi_substream_t *substream = list_entry(list, snd_rawmidi_substream_t, list); | |
850 | sprintf(substream->name, "Serial MIDI %d", substream->number + 1); | |
851 | } | |
852 | } | |
853 | ||
854 | static int __init snd_uart16550_rmidi(snd_uart16550_t *uart, int device, int outs, int ins, snd_rawmidi_t **rmidi) | |
855 | { | |
856 | snd_rawmidi_t *rrawmidi; | |
857 | int err; | |
858 | ||
859 | if ((err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, outs, ins, &rrawmidi)) < 0) | |
860 | return err; | |
861 | snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_uart16550_input); | |
862 | snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_uart16550_output); | |
863 | strcpy(rrawmidi->name, "Serial MIDI"); | |
864 | snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); | |
865 | snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); | |
866 | rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | | |
867 | SNDRV_RAWMIDI_INFO_INPUT | | |
868 | SNDRV_RAWMIDI_INFO_DUPLEX; | |
869 | rrawmidi->private_data = uart; | |
870 | if (rmidi) | |
871 | *rmidi = rrawmidi; | |
872 | return 0; | |
873 | } | |
874 | ||
875 | static int __init snd_serial_probe(int dev) | |
876 | { | |
877 | snd_card_t *card; | |
878 | snd_uart16550_t *uart; | |
879 | int err; | |
880 | ||
881 | if (!enable[dev]) | |
882 | return -ENOENT; | |
883 | ||
884 | switch (adaptor[dev]) { | |
885 | case SNDRV_SERIAL_SOUNDCANVAS: | |
886 | ins[dev] = 1; | |
887 | break; | |
888 | case SNDRV_SERIAL_MS124T: | |
889 | case SNDRV_SERIAL_MS124W_SA: | |
890 | outs[dev] = 1; | |
891 | ins[dev] = 1; | |
892 | break; | |
893 | case SNDRV_SERIAL_MS124W_MB: | |
894 | outs[dev] = 16; | |
895 | ins[dev] = 1; | |
896 | break; | |
897 | case SNDRV_SERIAL_GENERIC: | |
898 | break; | |
899 | default: | |
900 | snd_printk("Adaptor type is out of range 0-%d (%d)\n", | |
901 | SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]); | |
902 | return -ENODEV; | |
903 | } | |
904 | ||
905 | if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) { | |
906 | snd_printk("Count of outputs is out of range 1-%d (%d)\n", | |
907 | SNDRV_SERIAL_MAX_OUTS, outs[dev]); | |
908 | return -ENODEV; | |
909 | } | |
910 | ||
911 | if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) { | |
912 | snd_printk("Count of inputs is out of range 1-%d (%d)\n", | |
913 | SNDRV_SERIAL_MAX_INS, ins[dev]); | |
914 | return -ENODEV; | |
915 | } | |
916 | ||
917 | card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0); | |
918 | if (card == NULL) | |
919 | return -ENOMEM; | |
920 | ||
921 | strcpy(card->driver, "Serial"); | |
922 | strcpy(card->shortname, "Serial MIDI (UART16550A)"); | |
923 | ||
924 | if ((err = snd_uart16550_create(card, | |
925 | port[dev], | |
926 | irq[dev], | |
927 | speed[dev], | |
928 | base[dev], | |
929 | adaptor[dev], | |
930 | droponfull[dev], | |
16dab54b TI |
931 | &uart)) < 0) |
932 | goto _err; | |
1da177e4 | 933 | |
16dab54b TI |
934 | if ((err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi)) < 0) |
935 | goto _err; | |
1da177e4 LT |
936 | |
937 | sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d ins %d adaptor %s droponfull %d", | |
938 | card->shortname, | |
939 | uart->base, | |
940 | uart->irq, | |
941 | uart->speed, | |
942 | (int)uart->divisor, | |
943 | outs[dev], | |
944 | ins[dev], | |
945 | adaptor_names[uart->adaptor], | |
946 | uart->drop_on_full); | |
947 | ||
16dab54b TI |
948 | if ((err = snd_card_set_generic_dev(card)) < 0) |
949 | goto _err; | |
950 | ||
951 | if ((err = snd_card_register(card)) < 0) | |
952 | goto _err; | |
953 | ||
1da177e4 LT |
954 | snd_serial_cards[dev] = card; |
955 | return 0; | |
16dab54b TI |
956 | |
957 | _err: | |
958 | snd_card_free(card); | |
959 | return err; | |
1da177e4 LT |
960 | } |
961 | ||
962 | static int __init alsa_card_serial_init(void) | |
963 | { | |
964 | int dev = 0; | |
965 | int cards = 0; | |
966 | ||
967 | for (dev = 0; dev < SNDRV_CARDS; dev++) { | |
968 | if (snd_serial_probe(dev) == 0) | |
969 | cards++; | |
970 | } | |
971 | ||
972 | if (cards == 0) { | |
973 | #ifdef MODULE | |
974 | printk(KERN_ERR "serial midi soundcard not found or device busy\n"); | |
975 | #endif | |
976 | return -ENODEV; | |
977 | } | |
978 | return 0; | |
979 | } | |
980 | ||
981 | static void __exit alsa_card_serial_exit(void) | |
982 | { | |
983 | int dev; | |
984 | ||
985 | for (dev = 0; dev < SNDRV_CARDS; dev++) { | |
986 | if (snd_serial_cards[dev] != NULL) | |
987 | snd_card_free(snd_serial_cards[dev]); | |
988 | } | |
989 | } | |
990 | ||
991 | module_init(alsa_card_serial_init) | |
992 | module_exit(alsa_card_serial_exit) |