1 /* 2 * serial.c 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>, 4 * Isaku Yamahata <yamahata@private.email.ne.jp>, 5 * George Hansper <ghansper@apana.org.au>, 6 * Hannu Savolainen 7 * 8 * This code is based on the code from ALSA 0.5.9, but heavily rewritten. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 * Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com 25 * Added support for the Midiator MS-124T and for the MS-124W in 26 * Single Addressed (S/A) or Multiple Burst (M/B) mode, with 27 * power derived either parasitically from the serial port or 28 * from a separate power supply. 29 * 30 * More documentation can be found in serial-u16550.txt. 31 */ 32 33 #include <linux/init.h> 34 #include <linux/interrupt.h> 35 #include <linux/err.h> 36 #include <linux/platform_device.h> 37 #include <linux/slab.h> 38 #include <linux/ioport.h> 39 #include <linux/module.h> 40 #include <sound/core.h> 41 #include <sound/rawmidi.h> 42 #include <sound/initval.h> 43 44 #include <linux/serial_reg.h> 45 #include <linux/jiffies.h> 46 47 #include <asm/io.h> 48 49 MODULE_DESCRIPTION("MIDI serial u16550"); 50 MODULE_LICENSE("GPL"); 51 MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}"); 52 53 #define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */ 54 #define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */ 55 #define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */ 56 #define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */ 57 #define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */ 58 #define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC 59 static char *adaptor_names[] = { 60 "Soundcanvas", 61 "MS-124T", 62 "MS-124W S/A", 63 "MS-124W M/B", 64 "Generic" 65 }; 66 67 #define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */ 68 #define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */ 69 70 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 71 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 72 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */ 73 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */ 74 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */ 75 static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */ 76 static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */ 77 static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */ 78 static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */ 79 static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS}; 80 static bool droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF }; 81 82 module_param_array(index, int, NULL, 0444); 83 MODULE_PARM_DESC(index, "Index value for Serial MIDI."); 84 module_param_array(id, charp, NULL, 0444); 85 MODULE_PARM_DESC(id, "ID string for Serial MIDI."); 86 module_param_array(enable, bool, NULL, 0444); 87 MODULE_PARM_DESC(enable, "Enable UART16550A chip."); 88 module_param_array(port, long, NULL, 0444); 89 MODULE_PARM_DESC(port, "Port # for UART16550A chip."); 90 module_param_array(irq, int, NULL, 0444); 91 MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip."); 92 module_param_array(speed, int, NULL, 0444); 93 MODULE_PARM_DESC(speed, "Speed in bauds."); 94 module_param_array(base, int, NULL, 0444); 95 MODULE_PARM_DESC(base, "Base for divisor in bauds."); 96 module_param_array(outs, int, NULL, 0444); 97 MODULE_PARM_DESC(outs, "Number of MIDI outputs."); 98 module_param_array(ins, int, NULL, 0444); 99 MODULE_PARM_DESC(ins, "Number of MIDI inputs."); 100 module_param_array(droponfull, bool, NULL, 0444); 101 MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode"); 102 103 module_param_array(adaptor, int, NULL, 0444); 104 MODULE_PARM_DESC(adaptor, "Type of adaptor."); 105 106 /*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */ 107 108 #define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */ 109 #define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */ 110 111 #define TX_BUFF_SIZE (1<<15) /* Must be 2^n */ 112 #define TX_BUFF_MASK (TX_BUFF_SIZE - 1) 113 114 #define SERIAL_MODE_NOT_OPENED (0) 115 #define SERIAL_MODE_INPUT_OPEN (1 << 0) 116 #define SERIAL_MODE_OUTPUT_OPEN (1 << 1) 117 #define SERIAL_MODE_INPUT_TRIGGERED (1 << 2) 118 #define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3) 119 120 struct snd_uart16550 { 121 struct snd_card *card; 122 struct snd_rawmidi *rmidi; 123 struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS]; 124 struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS]; 125 126 int filemode; /* open status of file */ 127 128 spinlock_t open_lock; 129 130 int irq; 131 132 unsigned long base; 133 struct resource *res_base; 134 135 unsigned int speed; 136 unsigned int speed_base; 137 unsigned char divisor; 138 139 unsigned char old_divisor_lsb; 140 unsigned char old_divisor_msb; 141 unsigned char old_line_ctrl_reg; 142 143 /* parameter for using of write loop */ 144 short int fifo_limit; /* used in uart16550 */ 145 short int fifo_count; /* used in uart16550 */ 146 147 /* type of adaptor */ 148 int adaptor; 149 150 /* inputs */ 151 int prev_in; 152 unsigned char rstatus; 153 154 /* outputs */ 155 int prev_out; 156 unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS]; 157 158 /* write buffer and its writing/reading position */ 159 unsigned char tx_buff[TX_BUFF_SIZE]; 160 int buff_in_count; 161 int buff_in; 162 int buff_out; 163 int drop_on_full; 164 165 /* wait timer */ 166 unsigned int timer_running:1; 167 struct timer_list buffer_timer; 168 169 }; 170 171 static struct platform_device *devices[SNDRV_CARDS]; 172 173 static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart) 174 { 175 if (!uart->timer_running) { 176 /* timer 38600bps * 10bit * 16byte */ 177 uart->buffer_timer.expires = jiffies + (HZ+255)/256; 178 uart->timer_running = 1; 179 add_timer(&uart->buffer_timer); 180 } 181 } 182 183 static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart) 184 { 185 if (uart->timer_running) { 186 del_timer(&uart->buffer_timer); 187 uart->timer_running = 0; 188 } 189 } 190 191 /* This macro is only used in snd_uart16550_io_loop */ 192 static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart) 193 { 194 unsigned short buff_out = uart->buff_out; 195 if (uart->buff_in_count > 0) { 196 outb(uart->tx_buff[buff_out], uart->base + UART_TX); 197 uart->fifo_count++; 198 buff_out++; 199 buff_out &= TX_BUFF_MASK; 200 uart->buff_out = buff_out; 201 uart->buff_in_count--; 202 } 203 } 204 205 /* This loop should be called with interrupts disabled 206 * We don't want to interrupt this, 207 * as we're already handling an interrupt 208 */ 209 static void snd_uart16550_io_loop(struct snd_uart16550 * uart) 210 { 211 unsigned char c, status; 212 int substream; 213 214 /* recall previous stream */ 215 substream = uart->prev_in; 216 217 /* Read Loop */ 218 while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) { 219 /* while receive data ready */ 220 c = inb(uart->base + UART_RX); 221 222 /* keep track of last status byte */ 223 if (c & 0x80) 224 uart->rstatus = c; 225 226 /* handle stream switch */ 227 if (uart->adaptor == SNDRV_SERIAL_GENERIC) { 228 if (uart->rstatus == 0xf5) { 229 if (c <= SNDRV_SERIAL_MAX_INS && c > 0) 230 substream = c - 1; 231 if (c != 0xf5) 232 /* prevent future bytes from being 233 interpreted as streams */ 234 uart->rstatus = 0; 235 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) 236 && uart->midi_input[substream]) 237 snd_rawmidi_receive(uart->midi_input[substream], 238 &c, 1); 239 } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && 240 uart->midi_input[substream]) 241 snd_rawmidi_receive(uart->midi_input[substream], &c, 1); 242 243 if (status & UART_LSR_OE) 244 snd_printk(KERN_WARNING 245 "%s: Overrun on device at 0x%lx\n", 246 uart->rmidi->name, uart->base); 247 } 248 249 /* remember the last stream */ 250 uart->prev_in = substream; 251 252 /* 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) 256 uart->fifo_count = 0; 257 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); 265 } 266 } else { 267 /* Write loop */ 268 while (uart->fifo_count < uart->fifo_limit /* Can we write ? */ 269 && uart->buff_in_count > 0) /* Do we want to? */ 270 snd_uart16550_buffer_output(uart); 271 } 272 if (uart->irq < 0 && uart->buff_in_count > 0) 273 snd_uart16550_add_timer(uart); 274 } 275 276 /* 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: 282 * a) Writing a byte 283 * b) Reading the IIR 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 290 * opened/closed. 291 * 292 * 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?) 295 */ 296 static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id) 297 { 298 struct snd_uart16550 *uart; 299 300 uart = dev_id; 301 spin_lock(&uart->open_lock); 302 if (uart->filemode == SERIAL_MODE_NOT_OPENED) { 303 spin_unlock(&uart->open_lock); 304 return IRQ_NONE; 305 } 306 /* indicate to the UART that the interrupt has been serviced */ 307 inb(uart->base + UART_IIR); 308 snd_uart16550_io_loop(uart); 309 spin_unlock(&uart->open_lock); 310 return IRQ_HANDLED; 311 } 312 313 /* When the polling mode, this function calls snd_uart16550_io_loop. */ 314 static void snd_uart16550_buffer_timer(unsigned long data) 315 { 316 unsigned long flags; 317 struct snd_uart16550 *uart; 318 319 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); 324 } 325 326 /* 327 * this method probes, if an uart sits on given port 328 * return 0 if found 329 * return negative error if not found 330 */ 331 static int snd_uart16550_detect(struct snd_uart16550 *uart) 332 { 333 unsigned long io_base = uart->base; 334 int ok; 335 unsigned char c; 336 337 /* 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 */ 340 } 341 342 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); 345 return -EBUSY; 346 } 347 348 /* uart detected unless one of the following tests should fail */ 349 ok = 1; 350 /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */ 351 outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */ 352 c = inb(io_base + UART_IER); 353 /* The top four bits of the IER should always == 0 */ 354 if ((c & 0xf0) != 0) 355 ok = 0; /* failed */ 356 357 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 */ 361 if (c != 0xaa) 362 ok = 0; /* failed */ 363 364 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 */ 368 if (c != 0x55) 369 ok = 0; /* failed */ 370 371 return ok; 372 } 373 374 static void snd_uart16550_do_open(struct snd_uart16550 * uart) 375 { 376 char byte; 377 378 /* Initialize basic variables */ 379 uart->buff_in_count = 0; 380 uart->buff_in = 0; 381 uart->buff_out = 0; 382 uart->fifo_limit = 1; 383 uart->fifo_count = 0; 384 uart->timer_running = 0; 385 386 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 392 */ 393 ,uart->base + UART_FCR); /* FIFO Control Register */ 394 395 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); 403 404 outb(uart->divisor 405 ,uart->base + UART_DLL); /* Divisor Latch Low */ 406 outb(0 407 ,uart->base + UART_DLM); /* Divisor Latch High */ 408 /* DLAB is reset to 0 in next outb() */ 409 } 410 /* Set serial parameters (parity off, etc) */ 411 outb(UART_LCR_WLEN8 /* 8 data-bits */ 412 | 0 /* 1 stop-bit */ 413 | 0 /* parity off */ 414 | 0 /* DLAB = 0 */ 415 ,uart->base + UART_LCR); /* Line Control Register */ 416 417 switch (uart->adaptor) { 418 default: 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 423 */ 424 ,uart->base + UART_MCR); /* Modem Control Register */ 425 break; 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); 432 break; 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); 438 break; 439 } 440 441 if (uart->irq < 0) { 442 byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */ 443 |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */ 444 ; 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 */ 448 ; 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 */ 453 ; 454 } else { 455 byte = UART_IER_RDI /* Enable Receiver data interrupt */ 456 | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */ 457 ; 458 } 459 outb(byte, uart->base + UART_IER); /* Interrupt enable Register */ 460 461 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 */ 464 } 465 466 static void snd_uart16550_do_close(struct snd_uart16550 * uart) 467 { 468 if (uart->irq < 0) 469 snd_uart16550_del_timer(uart); 470 471 /* NOTE: may need to disable interrupts before de-registering out handler. 472 * For now, the consequences are harmless. 473 */ 474 475 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 */ 478 479 switch (uart->adaptor) { 480 default: 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 */ 485 break; 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); 492 break; 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); 498 break; 499 } 500 501 inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */ 502 503 /* 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 */ 514 } 515 } 516 517 static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream) 518 { 519 unsigned long flags; 520 struct snd_uart16550 *uart = substream->rmidi->private_data; 521 522 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); 528 return 0; 529 } 530 531 static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream) 532 { 533 unsigned long flags; 534 struct snd_uart16550 *uart = substream->rmidi->private_data; 535 536 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); 542 return 0; 543 } 544 545 static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream, 546 int up) 547 { 548 unsigned long flags; 549 struct snd_uart16550 *uart = substream->rmidi->private_data; 550 551 spin_lock_irqsave(&uart->open_lock, flags); 552 if (up) 553 uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED; 554 else 555 uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED; 556 spin_unlock_irqrestore(&uart->open_lock, flags); 557 } 558 559 static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream) 560 { 561 unsigned long flags; 562 struct snd_uart16550 *uart = substream->rmidi->private_data; 563 564 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); 570 return 0; 571 }; 572 573 static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream) 574 { 575 unsigned long flags; 576 struct snd_uart16550 *uart = substream->rmidi->private_data; 577 578 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); 584 return 0; 585 }; 586 587 static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart, 588 int Num) 589 { 590 if (uart->buff_in_count + Num < TX_BUFF_SIZE) 591 return 1; 592 else 593 return 0; 594 } 595 596 static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart, 597 unsigned char byte) 598 { 599 unsigned short buff_in = uart->buff_in; 600 if (uart->buff_in_count < TX_BUFF_SIZE) { 601 uart->tx_buff[buff_in] = byte; 602 buff_in++; 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); 608 return 1; 609 } else 610 return 0; 611 } 612 613 static int snd_uart16550_output_byte(struct snd_uart16550 *uart, 614 struct snd_rawmidi_substream *substream, 615 unsigned char midi_byte) 616 { 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? */ 622 623 /* 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); 628 } else { 629 if (uart->fifo_count < uart->fifo_limit) { 630 uart->fifo_count++; 631 outb(midi_byte, uart->base + UART_TX); 632 } else { 633 /* Cannot write (buffer empty) - 634 * put char in buffer */ 635 snd_uart16550_write_buffer(uart, midi_byte); 636 } 637 } 638 } else { 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); 643 return 0; 644 } 645 } 646 647 return 1; 648 } 649 650 static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream) 651 { 652 unsigned long flags; 653 unsigned char midi_byte, addr_byte; 654 struct snd_uart16550 *uart = substream->rmidi->private_data; 655 char first; 656 static unsigned long lasttime = 0; 657 658 /* 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) 661 */ 662 663 spin_lock_irqsave(&uart->open_lock, flags); 664 665 if (uart->irq < 0) /* polling */ 666 snd_uart16550_io_loop(uart); 667 668 if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) { 669 while (1) { 670 /* buffer full? */ 671 /* in this mode we need two bytes of space */ 672 if (uart->buff_in_count > TX_BUFF_SIZE - 2) 673 break; 674 if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1) 675 break; 676 #ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO 677 /* select exactly one of the four ports */ 678 addr_byte = (1 << (substream->number + 4)) | 0x08; 679 #else 680 /* select any combination of the four ports */ 681 addr_byte = (substream->number << 4) | 0x08; 682 /* ...except none */ 683 if (addr_byte == 0x08) 684 addr_byte = 0xf8; 685 #endif 686 snd_uart16550_output_byte(uart, substream, addr_byte); 687 /* send midi byte */ 688 snd_uart16550_output_byte(uart, substream, midi_byte); 689 } 690 } else { 691 first = 0; 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 */ 695 if (first == 0 && 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))) { 700 701 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 706 * event 707 */ 708 uart->prev_out = substream->number; 709 /* change part */ 710 snd_uart16550_output_byte(uart, substream, 711 0xf5); 712 /* data */ 713 snd_uart16550_output_byte(uart, substream, 714 uart->prev_out + 1); 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) 721 break; 722 723 } 724 725 /* send midi byte */ 726 if (!snd_uart16550_output_byte(uart, substream, midi_byte) && 727 !uart->drop_on_full ) 728 break; 729 730 if (midi_byte >= 0x80 && midi_byte < 0xf0) 731 uart->prev_status[uart->prev_out] = midi_byte; 732 first = 1; 733 734 snd_rawmidi_transmit_ack( substream, 1 ); 735 } 736 lasttime = jiffies; 737 } 738 spin_unlock_irqrestore(&uart->open_lock, flags); 739 } 740 741 static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream, 742 int up) 743 { 744 unsigned long flags; 745 struct snd_uart16550 *uart = substream->rmidi->private_data; 746 747 spin_lock_irqsave(&uart->open_lock, flags); 748 if (up) 749 uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED; 750 else 751 uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED; 752 spin_unlock_irqrestore(&uart->open_lock, flags); 753 if (up) 754 snd_uart16550_output_write(substream); 755 } 756 757 static struct snd_rawmidi_ops snd_uart16550_output = 758 { 759 .open = snd_uart16550_output_open, 760 .close = snd_uart16550_output_close, 761 .trigger = snd_uart16550_output_trigger, 762 }; 763 764 static struct snd_rawmidi_ops snd_uart16550_input = 765 { 766 .open = snd_uart16550_input_open, 767 .close = snd_uart16550_input_close, 768 .trigger = snd_uart16550_input_trigger, 769 }; 770 771 static int snd_uart16550_free(struct snd_uart16550 *uart) 772 { 773 if (uart->irq >= 0) 774 free_irq(uart->irq, uart); 775 release_and_free_resource(uart->res_base); 776 kfree(uart); 777 return 0; 778 }; 779 780 static int snd_uart16550_dev_free(struct snd_device *device) 781 { 782 struct snd_uart16550 *uart = device->device_data; 783 return snd_uart16550_free(uart); 784 } 785 786 static int snd_uart16550_create(struct snd_card *card, 787 unsigned long iobase, 788 int irq, 789 unsigned int speed, 790 unsigned int base, 791 int adaptor, 792 int droponfull, 793 struct snd_uart16550 **ruart) 794 { 795 static struct snd_device_ops ops = { 796 .dev_free = snd_uart16550_dev_free, 797 }; 798 struct snd_uart16550 *uart; 799 int err; 800 801 802 if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL) 803 return -ENOMEM; 804 uart->adaptor = adaptor; 805 uart->card = card; 806 spin_lock_init(&uart->open_lock); 807 uart->irq = -1; 808 uart->base = iobase; 809 uart->drop_on_full = droponfull; 810 811 if ((err = snd_uart16550_detect(uart)) <= 0) { 812 printk(KERN_ERR "no UART detected at 0x%lx\n", iobase); 813 snd_uart16550_free(uart); 814 return -ENODEV; 815 } 816 817 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); 822 } else { 823 uart->irq = irq; 824 } 825 } 826 uart->divisor = base / speed; 827 uart->speed = base / (unsigned int)uart->divisor; 828 uart->speed_base = base; 829 uart->prev_out = -1; 830 uart->prev_in = 0; 831 uart->rstatus = 0; 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; 837 838 /* Register device */ 839 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) { 840 snd_uart16550_free(uart); 841 return err; 842 } 843 844 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); 850 break; 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); 855 break; 856 default: 857 break; 858 } 859 860 if (ruart) 861 *ruart = uart; 862 863 return 0; 864 } 865 866 static void snd_uart16550_substreams(struct snd_rawmidi_str *stream) 867 { 868 struct snd_rawmidi_substream *substream; 869 870 list_for_each_entry(substream, &stream->substreams, list) { 871 sprintf(substream->name, "Serial MIDI %d", substream->number + 1); 872 } 873 } 874 875 static int snd_uart16550_rmidi(struct snd_uart16550 *uart, int device, 876 int outs, int ins, 877 struct snd_rawmidi **rmidi) 878 { 879 struct snd_rawmidi *rrawmidi; 880 int err; 881 882 err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, 883 outs, ins, &rrawmidi); 884 if (err < 0) 885 return err; 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; 897 if (rmidi) 898 *rmidi = rrawmidi; 899 return 0; 900 } 901 902 static int snd_serial_probe(struct platform_device *devptr) 903 { 904 struct snd_card *card; 905 struct snd_uart16550 *uart; 906 int err; 907 int dev = devptr->id; 908 909 switch (adaptor[dev]) { 910 case SNDRV_SERIAL_SOUNDCANVAS: 911 ins[dev] = 1; 912 break; 913 case SNDRV_SERIAL_MS124T: 914 case SNDRV_SERIAL_MS124W_SA: 915 outs[dev] = 1; 916 ins[dev] = 1; 917 break; 918 case SNDRV_SERIAL_MS124W_MB: 919 outs[dev] = 16; 920 ins[dev] = 1; 921 break; 922 case SNDRV_SERIAL_GENERIC: 923 break; 924 default: 925 snd_printk(KERN_ERR 926 "Adaptor type is out of range 0-%d (%d)\n", 927 SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]); 928 return -ENODEV; 929 } 930 931 if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) { 932 snd_printk(KERN_ERR 933 "Count of outputs is out of range 1-%d (%d)\n", 934 SNDRV_SERIAL_MAX_OUTS, outs[dev]); 935 return -ENODEV; 936 } 937 938 if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) { 939 snd_printk(KERN_ERR 940 "Count of inputs is out of range 1-%d (%d)\n", 941 SNDRV_SERIAL_MAX_INS, ins[dev]); 942 return -ENODEV; 943 } 944 945 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, 946 0, &card); 947 if (err < 0) 948 return err; 949 950 strcpy(card->driver, "Serial"); 951 strcpy(card->shortname, "Serial MIDI (UART16550A)"); 952 953 if ((err = snd_uart16550_create(card, 954 port[dev], 955 irq[dev], 956 speed[dev], 957 base[dev], 958 adaptor[dev], 959 droponfull[dev], 960 &uart)) < 0) 961 goto _err; 962 963 err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi); 964 if (err < 0) 965 goto _err; 966 967 sprintf(card->longname, "%s [%s] at %#lx, irq %d", 968 card->shortname, 969 adaptor_names[uart->adaptor], 970 uart->base, 971 uart->irq); 972 973 if ((err = snd_card_register(card)) < 0) 974 goto _err; 975 976 platform_set_drvdata(devptr, card); 977 return 0; 978 979 _err: 980 snd_card_free(card); 981 return err; 982 } 983 984 static int snd_serial_remove(struct platform_device *devptr) 985 { 986 snd_card_free(platform_get_drvdata(devptr)); 987 return 0; 988 } 989 990 #define SND_SERIAL_DRIVER "snd_serial_u16550" 991 992 static struct platform_driver snd_serial_driver = { 993 .probe = snd_serial_probe, 994 .remove = snd_serial_remove, 995 .driver = { 996 .name = SND_SERIAL_DRIVER, 997 }, 998 }; 999 1000 static void snd_serial_unregister_all(void) 1001 { 1002 int i; 1003 1004 for (i = 0; i < ARRAY_SIZE(devices); ++i) 1005 platform_device_unregister(devices[i]); 1006 platform_driver_unregister(&snd_serial_driver); 1007 } 1008 1009 static int __init alsa_card_serial_init(void) 1010 { 1011 int i, cards, err; 1012 1013 if ((err = platform_driver_register(&snd_serial_driver)) < 0) 1014 return err; 1015 1016 cards = 0; 1017 for (i = 0; i < SNDRV_CARDS; i++) { 1018 struct platform_device *device; 1019 if (! enable[i]) 1020 continue; 1021 device = platform_device_register_simple(SND_SERIAL_DRIVER, 1022 i, NULL, 0); 1023 if (IS_ERR(device)) 1024 continue; 1025 if (!platform_get_drvdata(device)) { 1026 platform_device_unregister(device); 1027 continue; 1028 } 1029 devices[i] = device; 1030 cards++; 1031 } 1032 if (! cards) { 1033 #ifdef MODULE 1034 printk(KERN_ERR "serial midi soundcard not found or device busy\n"); 1035 #endif 1036 snd_serial_unregister_all(); 1037 return -ENODEV; 1038 } 1039 return 0; 1040 } 1041 1042 static void __exit alsa_card_serial_exit(void) 1043 { 1044 snd_serial_unregister_all(); 1045 } 1046 1047 module_init(alsa_card_serial_init) 1048 module_exit(alsa_card_serial_exit) 1049