FILE
portman2x4.c
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linux-6.19.14/sound/drivers/portman2x4.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Driver for Midiman Portman2x4 parallel port midi interface 4 * 5 * Copyright (c) by Levent Guendogdu <levon@feature-it.com> 6 * 7 * ChangeLog 8 * Jan 24 2007 Matthias Koenig <mkoenig@suse.de> 9 * - cleanup and rewrite 10 * Sep 30 2004 Tobias Gehrig <tobias@gehrig.tk> 11 * - source code cleanup 12 * Sep 03 2004 Tobias Gehrig <tobias@gehrig.tk> 13 * - fixed compilation problem with alsa 1.0.6a (removed MODULE_CLASSES, 14 * MODULE_PARM_SYNTAX and changed MODULE_DEVICES to 15 * MODULE_SUPPORTED_DEVICE) 16 * Mar 24 2004 Tobias Gehrig <tobias@gehrig.tk> 17 * - added 2.6 kernel support 18 * Mar 18 2004 Tobias Gehrig <tobias@gehrig.tk> 19 * - added parport_unregister_driver to the startup routine if the driver fails to detect a portman 20 * - added support for all 4 output ports in portman_putmidi 21 * Mar 17 2004 Tobias Gehrig <tobias@gehrig.tk> 22 * - added checks for opened input device in interrupt handler 23 * Feb 20 2004 Tobias Gehrig <tobias@gehrig.tk> 24 * - ported from alsa 0.5 to 1.0 25 */ 26 27#include <linux/init.h> 28#include <linux/platform_device.h> 29#include <linux/parport.h> 30#include <linux/spinlock.h> 31#include <linux/delay.h> 32#include <linux/slab.h> 33#include <linux/module.h> 34#include <sound/core.h> 35#include <sound/initval.h> 36#include <sound/rawmidi.h> 37#include <sound/control.h> 38 39#define CARD_NAME "Portman 2x4" 40#define DRIVER_NAME "portman" 41#define PLATFORM_DRIVER "snd_portman2x4" 42 43static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 44static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; 45static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; 46 47static struct platform_device *platform_devices[SNDRV_CARDS]; 48static int device_count; 49 50module_param_array(index, int, NULL, 0444); 51MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard."); 52module_param_array(id, charp, NULL, 0444); 53MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard."); 54module_param_array(enable, bool, NULL, 0444); 55MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard."); 56 57MODULE_AUTHOR("Levent Guendogdu, Tobias Gehrig, Matthias Koenig"); 58MODULE_DESCRIPTION("Midiman Portman2x4"); 59MODULE_LICENSE("GPL"); 60 61/********************************************************************* 62 * Chip specific 63 *********************************************************************/ 64#define PORTMAN_NUM_INPUT_PORTS 2 65#define PORTMAN_NUM_OUTPUT_PORTS 4 66 67struct portman { 68 spinlock_t reg_lock; 69 struct snd_card *card; 70 struct snd_rawmidi *rmidi; 71 struct pardevice *pardev; 72 int open_count; 73 int mode[PORTMAN_NUM_INPUT_PORTS]; 74 struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS]; 75}; 76 77static int portman_free(struct portman *pm) 78{ 79 kfree(pm); 80 return 0; 81} 82 83static int portman_create(struct snd_card *card, 84 struct pardevice *pardev, 85 struct portman **rchip) 86{ 87 struct portman *pm; 88 89 *rchip = NULL; 90 91 pm = kzalloc(sizeof(struct portman), GFP_KERNEL); 92 if (pm == NULL) 93 return -ENOMEM; 94 95 /* Init chip specific data */ 96 spin_lock_init(&pm->reg_lock); 97 pm->card = card; 98 pm->pardev = pardev; 99 100 *rchip = pm; 101 102 return 0; 103} 104 105/********************************************************************* 106 * HW related constants 107 *********************************************************************/ 108 109/* Standard PC parallel port status register equates. */ 110#define PP_STAT_BSY 0x80 /* Busy status. Inverted. */ 111#define PP_STAT_ACK 0x40 /* Acknowledge. Non-Inverted. */ 112#define PP_STAT_POUT 0x20 /* Paper Out. Non-Inverted. */ 113#define PP_STAT_SEL 0x10 /* Select. Non-Inverted. */ 114#define PP_STAT_ERR 0x08 /* Error. Non-Inverted. */ 115 116/* Standard PC parallel port command register equates. */ 117#define PP_CMD_IEN 0x10 /* IRQ Enable. Non-Inverted. */ 118#define PP_CMD_SELI 0x08 /* Select Input. Inverted. */ 119#define PP_CMD_INIT 0x04 /* Init Printer. Non-Inverted. */ 120#define PP_CMD_FEED 0x02 /* Auto Feed. Inverted. */ 121#define PP_CMD_STB 0x01 /* Strobe. Inverted. */ 122 123/* Parallel Port Command Register as implemented by PCP2x4. */ 124#define INT_EN PP_CMD_IEN /* Interrupt enable. */ 125#define STROBE PP_CMD_STB /* Command strobe. */ 126 127/* The parallel port command register field (b1..b3) selects the 128 * various "registers" within the PC/P 2x4. These are the internal 129 * address of these "registers" that must be written to the parallel 130 * port command register. 131 */ 132#define RXDATA0 (0 << 1) /* PCP RxData channel 0. */ 133#define RXDATA1 (1 << 1) /* PCP RxData channel 1. */ 134#define GEN_CTL (2 << 1) /* PCP General Control Register. */ 135#define SYNC_CTL (3 << 1) /* PCP Sync Control Register. */ 136#define TXDATA0 (4 << 1) /* PCP TxData channel 0. */ 137#define TXDATA1 (5 << 1) /* PCP TxData channel 1. */ 138#define TXDATA2 (6 << 1) /* PCP TxData channel 2. */ 139#define TXDATA3 (7 << 1) /* PCP TxData channel 3. */ 140 141/* Parallel Port Status Register as implemented by PCP2x4. */ 142#define ESTB PP_STAT_POUT /* Echoed strobe. */ 143#define INT_REQ PP_STAT_ACK /* Input data int request. */ 144#define BUSY PP_STAT_ERR /* Interface Busy. */ 145 146/* Parallel Port Status Register BUSY and SELECT lines are multiplexed 147 * between several functions. Depending on which 2x4 "register" is 148 * currently selected (b1..b3), the BUSY and SELECT lines are 149 * assigned as follows: 150 * 151 * SELECT LINE: A3 A2 A1 152 * -------- 153 */ 154#define RXAVAIL PP_STAT_SEL /* Rx Available, channel 0. 0 0 0 */ 155// RXAVAIL1 PP_STAT_SEL /* Rx Available, channel 1. 0 0 1 */ 156#define SYNC_STAT PP_STAT_SEL /* Reserved - Sync Status. 0 1 0 */ 157// /* Reserved. 0 1 1 */ 158#define TXEMPTY PP_STAT_SEL /* Tx Empty, channel 0. 1 0 0 */ 159// TXEMPTY1 PP_STAT_SEL /* Tx Empty, channel 1. 1 0 1 */ 160// TXEMPTY2 PP_STAT_SEL /* Tx Empty, channel 2. 1 1 0 */ 161// TXEMPTY3 PP_STAT_SEL /* Tx Empty, channel 3. 1 1 1 */ 162 163/* BUSY LINE: A3 A2 A1 164 * -------- 165 */ 166#define RXDATA PP_STAT_BSY /* Rx Input Data, channel 0. 0 0 0 */ 167// RXDATA1 PP_STAT_BSY /* Rx Input Data, channel 1. 0 0 1 */ 168#define SYNC_DATA PP_STAT_BSY /* Reserved - Sync Data. 0 1 0 */ 169 /* Reserved. 0 1 1 */ 170#define DATA_ECHO PP_STAT_BSY /* Parallel Port Data Echo. 1 0 0 */ 171#define A0_ECHO PP_STAT_BSY /* Address 0 Echo. 1 0 1 */ 172#define A1_ECHO PP_STAT_BSY /* Address 1 Echo. 1 1 0 */ 173#define A2_ECHO PP_STAT_BSY /* Address 2 Echo. 1 1 1 */ 174 175#define PORTMAN2X4_MODE_INPUT_TRIGGERED 0x01 176 177/********************************************************************* 178 * Hardware specific functions 179 *********************************************************************/ 180static inline void portman_write_command(struct portman *pm, u8 value) 181{ 182 parport_write_control(pm->pardev->port, value); 183} 184 185static inline u8 portman_read_status(struct portman *pm) 186{ 187 return parport_read_status(pm->pardev->port); 188} 189 190static inline void portman_write_data(struct portman *pm, u8 value) 191{ 192 parport_write_data(pm->pardev->port, value); 193} 194 195static void portman_write_midi(struct portman *pm, 196 int port, u8 mididata) 197{ 198 int command = ((port + 4) << 1); 199 200 /* Get entering data byte and port number in BL and BH respectively. 201 * Set up Tx Channel address field for use with PP Cmd Register. 202 * Store address field in BH register. 203 * Inputs: AH = Output port number (0..3). 204 * AL = Data byte. 205 * command = TXDATA0 | INT_EN; 206 * Align port num with address field (b1...b3), 207 * set address for TXDatax, Strobe=0 208 */ 209 command |= INT_EN; 210 211 /* Disable interrupts so that the process is not interrupted, then 212 * write the address associated with the current Tx channel to the 213 * PP Command Reg. Do not set the Strobe signal yet. 214 */ 215 216 do { 217 portman_write_command(pm, command); 218 219 /* While the address lines settle, write parallel output data to 220 * PP Data Reg. This has no effect until Strobe signal is asserted. 221 */ 222 223 portman_write_data(pm, mididata); 224 225 /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP 226 * Status Register), then go write data. Else go back and wait. 227 */ 228 } while ((portman_read_status(pm) & TXEMPTY) != TXEMPTY); 229 230 /* TxEmpty is set. Maintain PC/P destination address and assert 231 * Strobe through the PP Command Reg. This will Strobe data into 232 * the PC/P transmitter and set the PC/P BUSY signal. 233 */ 234 235 portman_write_command(pm, command | STROBE); 236 237 /* Wait for strobe line to settle and echo back through hardware. 238 * Once it has echoed back, assume that the address and data lines 239 * have settled! 240 */ 241 242 while ((portman_read_status(pm) & ESTB) == 0) 243 cpu_relax(); 244 245 /* Release strobe and immediately re-allow interrupts. */ 246 portman_write_command(pm, command); 247 248 while ((portman_read_status(pm) & ESTB) == ESTB) 249 cpu_relax(); 250 251 /* PC/P BUSY is now set. We must wait until BUSY resets itself. 252 * We'll reenable ints while we're waiting. 253 */ 254 255 while ((portman_read_status(pm) & BUSY) == BUSY) 256 cpu_relax(); 257 258 /* Data sent. */ 259} 260 261 262/* 263 * Read MIDI byte from port 264 * Attempt to read input byte from specified hardware input port (0..). 265 * Return -1 if no data 266 */ 267static int portman_read_midi(struct portman *pm, int port) 268{ 269 unsigned char midi_data = 0; 270 unsigned char cmdout; /* Saved address+IE bit. */ 271 272 /* Make sure clocking edge is down before starting... */ 273 portman_write_data(pm, 0); /* Make sure edge is down. */ 274 275 /* Set destination address to PCP. */ 276 cmdout = (port << 1) | INT_EN; /* Address + IE + No Strobe. */ 277 portman_write_command(pm, cmdout); 278 279 while ((portman_read_status(pm) & ESTB) == ESTB) 280 cpu_relax(); /* Wait for strobe echo. */ 281 282 /* After the address lines settle, check multiplexed RxAvail signal. 283 * If data is available, read it. 284 */ 285 if ((portman_read_status(pm) & RXAVAIL) == 0) 286 return -1; /* No data. */ 287 288 /* Set the Strobe signal to enable the Rx clocking circuitry. */ 289 portman_write_command(pm, cmdout | STROBE); /* Write address+IE+Strobe. */ 290 291 while ((portman_read_status(pm) & ESTB) == 0) 292 cpu_relax(); /* Wait for strobe echo. */ 293 294 /* The first data bit (msb) is already sitting on the input line. */ 295 midi_data = (portman_read_status(pm) & 128); 296 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 297 298 /* Data bit 6. */ 299 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 300 midi_data |= (portman_read_status(pm) >> 1) & 64; 301 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 302 303 /* Data bit 5. */ 304 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 305 midi_data |= (portman_read_status(pm) >> 2) & 32; 306 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 307 308 /* Data bit 4. */ 309 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 310 midi_data |= (portman_read_status(pm) >> 3) & 16; 311 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 312 313 /* Data bit 3. */ 314 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 315 midi_data |= (portman_read_status(pm) >> 4) & 8; 316 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 317 318 /* Data bit 2. */ 319 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 320 midi_data |= (portman_read_status(pm) >> 5) & 4; 321 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 322 323 /* Data bit 1. */ 324 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 325 midi_data |= (portman_read_status(pm) >> 6) & 2; 326 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 327 328 /* Data bit 0. */ 329 portman_write_data(pm, 0); /* Cause falling edge while data settles. */ 330 midi_data |= (portman_read_status(pm) >> 7) & 1; 331 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */ 332 portman_write_data(pm, 0); /* Return data clock low. */ 333 334 335 /* De-assert Strobe and return data. */ 336 portman_write_command(pm, cmdout); /* Output saved address+IE. */ 337 338 /* Wait for strobe echo. */ 339 while ((portman_read_status(pm) & ESTB) == ESTB) 340 cpu_relax(); 341 342 return (midi_data & 255); /* Shift back and return value. */ 343} 344 345/* 346 * Checks if any input data on the given channel is available 347 * Checks RxAvail 348 */ 349static int portman_data_avail(struct portman *pm, int channel) 350{ 351 int command = INT_EN; 352 switch (channel) { 353 case 0: 354 command |= RXDATA0; 355 break; 356 case 1: 357 command |= RXDATA1; 358 break; 359 } 360 /* Write hardware (assumme STROBE=0) */ 361 portman_write_command(pm, command); 362 /* Check multiplexed RxAvail signal */ 363 if ((portman_read_status(pm) & RXAVAIL) == RXAVAIL) 364 return 1; /* Data available */ 365 366 /* No Data available */ 367 return 0; 368} 369 370 371/* 372 * Flushes any input 373 */ 374static void portman_flush_input(struct portman *pm, unsigned char port) 375{ 376 /* Local variable for counting things */ 377 unsigned int i = 0; 378 unsigned char command = 0; 379 380 switch (port) { 381 case 0: 382 command = RXDATA0; 383 break; 384 case 1: 385 command = RXDATA1; 386 break; 387 default: 388 dev_warn(pm->card->dev, "%s Won't flush port %i\n", 389 __func__, port); 390 return; 391 } 392 393 /* Set address for specified channel in port and allow to settle. */ 394 portman_write_command(pm, command); 395 396 /* Assert the Strobe and wait for echo back. */ 397 portman_write_command(pm, command | STROBE); 398 399 /* Wait for ESTB */ 400 while ((portman_read_status(pm) & ESTB) == 0) 401 cpu_relax(); 402 403 /* Output clock cycles to the Rx circuitry. */ 404 portman_write_data(pm, 0); 405 406 /* Flush 250 bits... */ 407 for (i = 0; i < 250; i++) { 408 portman_write_data(pm, 1); 409 portman_write_data(pm, 0); 410 } 411 412 /* Deassert the Strobe signal of the port and wait for it to settle. */ 413 portman_write_command(pm, command | INT_EN); 414 415 /* Wait for settling */ 416 while ((portman_read_status(pm) & ESTB) == ESTB) 417 cpu_relax(); 418} 419 420static int portman_probe(struct parport *p) 421{ 422 /* Initialize the parallel port data register. Will set Rx clocks 423 * low in case we happen to be addressing the Rx ports at this time. 424 */ 425 /* 1 */ 426 parport_write_data(p, 0); 427 428 /* Initialize the parallel port command register, thus initializing 429 * hardware handshake lines to midi box: 430 * 431 * Strobe = 0 432 * Interrupt Enable = 0 433 */ 434 /* 2 */ 435 parport_write_control(p, 0); 436 437 /* Check if Portman PC/P 2x4 is out there. */ 438 /* 3 */ 439 parport_write_control(p, RXDATA0); /* Write Strobe=0 to command reg. */ 440 441 /* Check for ESTB to be clear */ 442 /* 4 */ 443 if ((parport_read_status(p) & ESTB) == ESTB) 444 return 1; /* CODE 1 - Strobe Failure. */ 445 446 /* Set for RXDATA0 where no damage will be done. */ 447 /* 5 */ 448 parport_write_control(p, RXDATA0 | STROBE); /* Write Strobe=1 to command reg. */ 449 450 /* 6 */ 451 if ((parport_read_status(p) & ESTB) != ESTB) 452 return 1; /* CODE 1 - Strobe Failure. */ 453 454 /* 7 */ 455 parport_write_control(p, 0); /* Reset Strobe=0. */ 456 457 /* Check if Tx circuitry is functioning properly. If initialized 458 * unit TxEmpty is false, send out char and see if it goes true. 459 */ 460 /* 8 */ 461 parport_write_control(p, TXDATA0); /* Tx channel 0, strobe off. */ 462 463 /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP 464 * Status Register), then go write data. Else go back and wait. 465 */ 466 /* 9 */ 467 if ((parport_read_status(p) & TXEMPTY) == 0) 468 return 2; 469 470 /* Return OK status. */ 471 return 0; 472} 473 474static int portman_device_init(struct portman *pm) 475{ 476 portman_flush_input(pm, 0); 477 portman_flush_input(pm, 1); 478 479 return 0; 480} 481 482/********************************************************************* 483 * Rawmidi 484 *********************************************************************/ 485static int snd_portman_midi_open(struct snd_rawmidi_substream *substream) 486{ 487 return 0; 488} 489 490static int snd_portman_midi_close(struct snd_rawmidi_substream *substream) 491{ 492 return 0; 493} 494 495static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream, 496 int up) 497{ 498 struct portman *pm = substream->rmidi->private_data; 499 500 guard(spinlock_irqsave)(&pm->reg_lock); 501 if (up) 502 pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED; 503 else 504 pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED; 505} 506 507static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream, 508 int up) 509{ 510 struct portman *pm = substream->rmidi->private_data; 511 unsigned char byte; 512 513 guard(spinlock_irqsave)(&pm->reg_lock); 514 if (up) { 515 while ((snd_rawmidi_transmit(substream, &byte, 1) == 1)) 516 portman_write_midi(pm, substream->number, byte); 517 } 518} 519 520static const struct snd_rawmidi_ops snd_portman_midi_output = { 521 .open = snd_portman_midi_open, 522 .close = snd_portman_midi_close, 523 .trigger = snd_portman_midi_output_trigger, 524}; 525 526static const struct snd_rawmidi_ops snd_portman_midi_input = { 527 .open = snd_portman_midi_open, 528 .close = snd_portman_midi_close, 529 .trigger = snd_portman_midi_input_trigger, 530}; 531 532/* Create and initialize the rawmidi component */ 533static int snd_portman_rawmidi_create(struct snd_card *card) 534{ 535 struct portman *pm = card->private_data; 536 struct snd_rawmidi *rmidi; 537 struct snd_rawmidi_substream *substream; 538 int err; 539 540 err = snd_rawmidi_new(card, CARD_NAME, 0, 541 PORTMAN_NUM_OUTPUT_PORTS, 542 PORTMAN_NUM_INPUT_PORTS, 543 &rmidi); 544 if (err < 0) 545 return err; 546 547 rmidi->private_data = pm; 548 strscpy(rmidi->name, CARD_NAME); 549 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | 550 SNDRV_RAWMIDI_INFO_INPUT | 551 SNDRV_RAWMIDI_INFO_DUPLEX; 552 553 pm->rmidi = rmidi; 554 555 /* register rawmidi ops */ 556 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 557 &snd_portman_midi_output); 558 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 559 &snd_portman_midi_input); 560 561 /* name substreams */ 562 /* output */ 563 list_for_each_entry(substream, 564 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 565 list) { 566 sprintf(substream->name, 567 "Portman2x4 %d", substream->number+1); 568 } 569 /* input */ 570 list_for_each_entry(substream, 571 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 572 list) { 573 pm->midi_input[substream->number] = substream; 574 sprintf(substream->name, 575 "Portman2x4 %d", substream->number+1); 576 } 577 578 return err; 579} 580 581/********************************************************************* 582 * parport stuff 583 *********************************************************************/ 584static void snd_portman_interrupt(void *userdata) 585{ 586 unsigned char midivalue = 0; 587 struct portman *pm = ((struct snd_card*)userdata)->private_data; 588 589 guard(spinlock)(&pm->reg_lock); 590 591 /* While any input data is waiting */ 592 while ((portman_read_status(pm) & INT_REQ) == INT_REQ) { 593 /* If data available on channel 0, 594 read it and stuff it into the queue. */ 595 if (portman_data_avail(pm, 0)) { 596 /* Read Midi */ 597 midivalue = portman_read_midi(pm, 0); 598 /* put midi into queue... */ 599 if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED) 600 snd_rawmidi_receive(pm->midi_input[0], 601 &midivalue, 1); 602 603 } 604 /* If data available on channel 1, 605 read it and stuff it into the queue. */ 606 if (portman_data_avail(pm, 1)) { 607 /* Read Midi */ 608 midivalue = portman_read_midi(pm, 1); 609 /* put midi into queue... */ 610 if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED) 611 snd_rawmidi_receive(pm->midi_input[1], 612 &midivalue, 1); 613 } 614 615 } 616} 617 618static void snd_portman_attach(struct parport *p) 619{ 620 struct platform_device *device; 621 622 device = platform_device_alloc(PLATFORM_DRIVER, device_count); 623 if (!device) 624 return; 625 626 /* Temporary assignment to forward the parport */ 627 platform_set_drvdata(device, p); 628 629 if (platform_device_add(device) < 0) { 630 platform_device_put(device); 631 return; 632 } 633 634 /* Since we dont get the return value of probe 635 * We need to check if device probing succeeded or not */ 636 if (!platform_get_drvdata(device)) { 637 platform_device_unregister(device); 638 return; 639 } 640 641 /* register device in global table */ 642 platform_devices[device_count] = device; 643 device_count++; 644} 645 646static void snd_portman_detach(struct parport *p) 647{ 648 /* nothing to do here */ 649} 650 651static int snd_portman_dev_probe(struct pardevice *pardev) 652{ 653 if (strcmp(pardev->name, DRIVER_NAME)) 654 return -ENODEV; 655 656 return 0; 657} 658 659static struct parport_driver portman_parport_driver = { 660 .name = "portman2x4", 661 .probe = snd_portman_dev_probe, 662 .match_port = snd_portman_attach, 663 .detach = snd_portman_detach, 664}; 665 666/********************************************************************* 667 * platform stuff 668 *********************************************************************/ 669static void snd_portman_card_private_free(struct snd_card *card) 670{ 671 struct portman *pm = card->private_data; 672 struct pardevice *pardev = pm->pardev; 673 674 if (pardev) { 675 parport_release(pardev); 676 parport_unregister_device(pardev); 677 } 678 679 portman_free(pm); 680} 681 682static int snd_portman_probe(struct platform_device *pdev) 683{ 684 struct pardevice *pardev; 685 struct parport *p; 686 int dev = pdev->id; 687 struct snd_card *card = NULL; 688 struct portman *pm = NULL; 689 int err; 690 struct pardev_cb portman_cb = { 691 .preempt = NULL, 692 .wakeup = NULL, 693 .irq_func = snd_portman_interrupt, /* ISR */ 694 .flags = PARPORT_DEV_EXCL, /* flags */ 695 }; 696 697 p = platform_get_drvdata(pdev); 698 platform_set_drvdata(pdev, NULL); 699 700 if (dev >= SNDRV_CARDS) 701 return -ENODEV; 702 if (!enable[dev]) 703 return -ENOENT; 704 705 err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE, 706 0, &card); 707 if (err < 0) { 708 dev_dbg(&pdev->dev, "Cannot create card\n"); 709 return err; 710 } 711 strscpy(card->driver, DRIVER_NAME); 712 strscpy(card->shortname, CARD_NAME); 713 sprintf(card->longname, "%s at 0x%lx, irq %i", 714 card->shortname, p->base, p->irq); 715 716 portman_cb.private = card; /* private */ 717 pardev = parport_register_dev_model(p, /* port */ 718 DRIVER_NAME, /* name */ 719 &portman_cb, /* callbacks */ 720 pdev->id); /* device number */ 721 if (pardev == NULL) { 722 dev_dbg(card->dev, "Cannot register pardevice\n"); 723 err = -EIO; 724 goto __err; 725 } 726 727 /* claim parport */ 728 if (parport_claim(pardev)) { 729 dev_dbg(card->dev, "Cannot claim parport 0x%lx\n", pardev->port->base); 730 err = -EIO; 731 goto free_pardev; 732 } 733 734 err = portman_create(card, pardev, &pm); 735 if (err < 0) { 736 dev_dbg(card->dev, "Cannot create main component\n"); 737 goto release_pardev; 738 } 739 card->private_data = pm; 740 card->private_free = snd_portman_card_private_free; 741 742 err = portman_probe(p); 743 if (err) { 744 err = -EIO; 745 goto __err; 746 } 747 748 err = snd_portman_rawmidi_create(card); 749 if (err < 0) { 750 dev_dbg(card->dev, "Creating Rawmidi component failed\n"); 751 goto __err; 752 } 753 754 /* init device */ 755 err = portman_device_init(pm); 756 if (err < 0) 757 goto __err; 758 759 platform_set_drvdata(pdev, card); 760 761 /* At this point card will be usable */ 762 err = snd_card_register(card); 763 if (err < 0) { 764 dev_dbg(card->dev, "Cannot register card\n"); 765 goto __err; 766 } 767 768 dev_info(card->dev, "Portman 2x4 on 0x%lx\n", p->base); 769 return 0; 770 771release_pardev: 772 parport_release(pardev); 773free_pardev: 774 parport_unregister_device(pardev); 775__err: 776 snd_card_free(card); 777 return err; 778} 779 780static void snd_portman_remove(struct platform_device *pdev) 781{ 782 struct snd_card *card = platform_get_drvdata(pdev); 783 784 if (card) 785 snd_card_free(card); 786} 787 788 789static struct platform_driver snd_portman_driver = { 790 .probe = snd_portman_probe, 791 .remove = snd_portman_remove, 792 .driver = { 793 .name = PLATFORM_DRIVER, 794 } 795}; 796 797/********************************************************************* 798 * module init stuff 799 *********************************************************************/ 800static void snd_portman_unregister_all(void) 801{ 802 int i; 803 804 for (i = 0; i < SNDRV_CARDS; ++i) { 805 if (platform_devices[i]) { 806 platform_device_unregister(platform_devices[i]); 807 platform_devices[i] = NULL; 808 } 809 } 810 platform_driver_unregister(&snd_portman_driver); 811 parport_unregister_driver(&portman_parport_driver); 812} 813 814static int __init snd_portman_module_init(void) 815{ 816 int err; 817 818 err = platform_driver_register(&snd_portman_driver); 819 if (err < 0) 820 return err; 821 822 if (parport_register_driver(&portman_parport_driver) != 0) { 823 platform_driver_unregister(&snd_portman_driver); 824 return -EIO; 825 } 826 827 if (device_count == 0) { 828 snd_portman_unregister_all(); 829 return -ENODEV; 830 } 831 832 return 0; 833} 834 835static void __exit snd_portman_module_exit(void) 836{ 837 snd_portman_unregister_all(); 838} 839 840module_init(snd_portman_module_init); 841module_exit(snd_portman_module_exit);
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