1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Driver for Midiman Portman2x4 parallel port midi interface
5 * Copyright (c) by Levent Guendogdu <levon@feature-it.com>
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
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>
39 #define CARD_NAME "Portman 2x4"
40 #define DRIVER_NAME "portman"
41 #define PLATFORM_DRIVER "snd_portman2x4"
43 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
44 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
45 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
47 static struct platform_device *platform_devices[SNDRV_CARDS];
48 static int device_count;
50 module_param_array(index, int, NULL, 0444);
51 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
52 module_param_array(id, charp, NULL, 0444);
53 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
54 module_param_array(enable, bool, NULL, 0444);
55 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
57 MODULE_AUTHOR("Levent Guendogdu, Tobias Gehrig, Matthias Koenig");
58 MODULE_DESCRIPTION("Midiman Portman2x4");
59 MODULE_LICENSE("GPL");
61 /*********************************************************************
63 *********************************************************************/
64 #define PORTMAN_NUM_INPUT_PORTS 2
65 #define PORTMAN_NUM_OUTPUT_PORTS 4
69 struct snd_card *card;
70 struct snd_rawmidi *rmidi;
71 struct pardevice *pardev;
73 int mode[PORTMAN_NUM_INPUT_PORTS];
74 struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS];
77 static int portman_free(struct portman *pm)
83 static int portman_create(struct snd_card *card,
84 struct pardevice *pardev,
85 struct portman **rchip)
91 pm = kzalloc(sizeof(struct portman), GFP_KERNEL);
95 /* Init chip specific data */
96 spin_lock_init(&pm->reg_lock);
105 /*********************************************************************
106 * HW related constants
107 *********************************************************************/
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. */
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. */
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. */
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.
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. */
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. */
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:
151 * SELECT LINE: A3 A2 A1
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 */
163 /* BUSY LINE: A3 A2 A1
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 */
175 #define PORTMAN2X4_MODE_INPUT_TRIGGERED 0x01
177 /*********************************************************************
178 * Hardware specific functions
179 *********************************************************************/
180 static inline void portman_write_command(struct portman *pm, u8 value)
182 parport_write_control(pm->pardev->port, value);
185 static inline u8 portman_read_status(struct portman *pm)
187 return parport_read_status(pm->pardev->port);
190 static inline void portman_write_data(struct portman *pm, u8 value)
192 parport_write_data(pm->pardev->port, value);
195 static void portman_write_midi(struct portman *pm,
196 int port, u8 mididata)
198 int command = ((port + 4) << 1);
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).
205 * command = TXDATA0 | INT_EN;
206 * Align port num with address field (b1...b3),
207 * set address for TXDatax, Strobe=0
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.
217 portman_write_command(pm, command);
219 /* While the address lines settle, write parallel output data to
220 * PP Data Reg. This has no effect until Strobe signal is asserted.
223 portman_write_data(pm, mididata);
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.
228 } while ((portman_read_status(pm) & TXEMPTY) != TXEMPTY);
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.
235 portman_write_command(pm, command | STROBE);
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
242 while ((portman_read_status(pm) & ESTB) == 0)
245 /* Release strobe and immediately re-allow interrupts. */
246 portman_write_command(pm, command);
248 while ((portman_read_status(pm) & ESTB) == ESTB)
251 /* PC/P BUSY is now set. We must wait until BUSY resets itself.
252 * We'll reenable ints while we're waiting.
255 while ((portman_read_status(pm) & BUSY) == BUSY)
263 * Read MIDI byte from port
264 * Attempt to read input byte from specified hardware input port (0..).
265 * Return -1 if no data
267 static int portman_read_midi(struct portman *pm, int port)
269 unsigned char midi_data = 0;
270 unsigned char cmdout; /* Saved address+IE bit. */
272 /* Make sure clocking edge is down before starting... */
273 portman_write_data(pm, 0); /* Make sure edge is down. */
275 /* Set destination address to PCP. */
276 cmdout = (port << 1) | INT_EN; /* Address + IE + No Strobe. */
277 portman_write_command(pm, cmdout);
279 while ((portman_read_status(pm) & ESTB) == ESTB)
280 cpu_relax(); /* Wait for strobe echo. */
282 /* After the address lines settle, check multiplexed RxAvail signal.
283 * If data is available, read it.
285 if ((portman_read_status(pm) & RXAVAIL) == 0)
286 return -1; /* No data. */
288 /* Set the Strobe signal to enable the Rx clocking circuitry. */
289 portman_write_command(pm, cmdout | STROBE); /* Write address+IE+Strobe. */
291 while ((portman_read_status(pm) & ESTB) == 0)
292 cpu_relax(); /* Wait for strobe echo. */
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. */
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. */
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. */
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. */
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. */
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. */
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. */
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. */
335 /* De-assert Strobe and return data. */
336 portman_write_command(pm, cmdout); /* Output saved address+IE. */
338 /* Wait for strobe echo. */
339 while ((portman_read_status(pm) & ESTB) == ESTB)
342 return (midi_data & 255); /* Shift back and return value. */
346 * Checks if any input data on the given channel is available
349 static int portman_data_avail(struct portman *pm, int channel)
351 int command = INT_EN;
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 */
366 /* No Data available */
374 static void portman_flush_input(struct portman *pm, unsigned char port)
376 /* Local variable for counting things */
378 unsigned char command = 0;
388 snd_printk(KERN_WARNING
389 "portman_flush_input() Won't flush port %i\n",
394 /* Set address for specified channel in port and allow to settle. */
395 portman_write_command(pm, command);
397 /* Assert the Strobe and wait for echo back. */
398 portman_write_command(pm, command | STROBE);
401 while ((portman_read_status(pm) & ESTB) == 0)
404 /* Output clock cycles to the Rx circuitry. */
405 portman_write_data(pm, 0);
407 /* Flush 250 bits... */
408 for (i = 0; i < 250; i++) {
409 portman_write_data(pm, 1);
410 portman_write_data(pm, 0);
413 /* Deassert the Strobe signal of the port and wait for it to settle. */
414 portman_write_command(pm, command | INT_EN);
416 /* Wait for settling */
417 while ((portman_read_status(pm) & ESTB) == ESTB)
421 static int portman_probe(struct parport *p)
423 /* Initialize the parallel port data register. Will set Rx clocks
424 * low in case we happen to be addressing the Rx ports at this time.
427 parport_write_data(p, 0);
429 /* Initialize the parallel port command register, thus initializing
430 * hardware handshake lines to midi box:
433 * Interrupt Enable = 0
436 parport_write_control(p, 0);
438 /* Check if Portman PC/P 2x4 is out there. */
440 parport_write_control(p, RXDATA0); /* Write Strobe=0 to command reg. */
442 /* Check for ESTB to be clear */
444 if ((parport_read_status(p) & ESTB) == ESTB)
445 return 1; /* CODE 1 - Strobe Failure. */
447 /* Set for RXDATA0 where no damage will be done. */
449 parport_write_control(p, RXDATA0 | STROBE); /* Write Strobe=1 to command reg. */
452 if ((parport_read_status(p) & ESTB) != ESTB)
453 return 1; /* CODE 1 - Strobe Failure. */
456 parport_write_control(p, 0); /* Reset Strobe=0. */
458 /* Check if Tx circuitry is functioning properly. If initialized
459 * unit TxEmpty is false, send out char and see if it goes true.
462 parport_write_control(p, TXDATA0); /* Tx channel 0, strobe off. */
464 /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
465 * Status Register), then go write data. Else go back and wait.
468 if ((parport_read_status(p) & TXEMPTY) == 0)
471 /* Return OK status. */
475 static int portman_device_init(struct portman *pm)
477 portman_flush_input(pm, 0);
478 portman_flush_input(pm, 1);
483 /*********************************************************************
485 *********************************************************************/
486 static int snd_portman_midi_open(struct snd_rawmidi_substream *substream)
491 static int snd_portman_midi_close(struct snd_rawmidi_substream *substream)
496 static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream,
499 struct portman *pm = substream->rmidi->private_data;
502 spin_lock_irqsave(&pm->reg_lock, flags);
504 pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED;
506 pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED;
507 spin_unlock_irqrestore(&pm->reg_lock, flags);
510 static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream,
513 struct portman *pm = substream->rmidi->private_data;
517 spin_lock_irqsave(&pm->reg_lock, flags);
519 while ((snd_rawmidi_transmit(substream, &byte, 1) == 1))
520 portman_write_midi(pm, substream->number, byte);
522 spin_unlock_irqrestore(&pm->reg_lock, flags);
525 static const struct snd_rawmidi_ops snd_portman_midi_output = {
526 .open = snd_portman_midi_open,
527 .close = snd_portman_midi_close,
528 .trigger = snd_portman_midi_output_trigger,
531 static const struct snd_rawmidi_ops snd_portman_midi_input = {
532 .open = snd_portman_midi_open,
533 .close = snd_portman_midi_close,
534 .trigger = snd_portman_midi_input_trigger,
537 /* Create and initialize the rawmidi component */
538 static int snd_portman_rawmidi_create(struct snd_card *card)
540 struct portman *pm = card->private_data;
541 struct snd_rawmidi *rmidi;
542 struct snd_rawmidi_substream *substream;
545 err = snd_rawmidi_new(card, CARD_NAME, 0,
546 PORTMAN_NUM_OUTPUT_PORTS,
547 PORTMAN_NUM_INPUT_PORTS,
552 rmidi->private_data = pm;
553 strcpy(rmidi->name, CARD_NAME);
554 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
555 SNDRV_RAWMIDI_INFO_INPUT |
556 SNDRV_RAWMIDI_INFO_DUPLEX;
560 /* register rawmidi ops */
561 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
562 &snd_portman_midi_output);
563 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
564 &snd_portman_midi_input);
566 /* name substreams */
568 list_for_each_entry(substream,
569 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
571 sprintf(substream->name,
572 "Portman2x4 %d", substream->number+1);
575 list_for_each_entry(substream,
576 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
578 pm->midi_input[substream->number] = substream;
579 sprintf(substream->name,
580 "Portman2x4 %d", substream->number+1);
586 /*********************************************************************
588 *********************************************************************/
589 static void snd_portman_interrupt(void *userdata)
591 unsigned char midivalue = 0;
592 struct portman *pm = ((struct snd_card*)userdata)->private_data;
594 spin_lock(&pm->reg_lock);
596 /* While any input data is waiting */
597 while ((portman_read_status(pm) & INT_REQ) == INT_REQ) {
598 /* If data available on channel 0,
599 read it and stuff it into the queue. */
600 if (portman_data_avail(pm, 0)) {
602 midivalue = portman_read_midi(pm, 0);
603 /* put midi into queue... */
604 if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
605 snd_rawmidi_receive(pm->midi_input[0],
609 /* If data available on channel 1,
610 read it and stuff it into the queue. */
611 if (portman_data_avail(pm, 1)) {
613 midivalue = portman_read_midi(pm, 1);
614 /* put midi into queue... */
615 if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
616 snd_rawmidi_receive(pm->midi_input[1],
622 spin_unlock(&pm->reg_lock);
625 static void snd_portman_attach(struct parport *p)
627 struct platform_device *device;
629 device = platform_device_alloc(PLATFORM_DRIVER, device_count);
633 /* Temporary assignment to forward the parport */
634 platform_set_drvdata(device, p);
636 if (platform_device_add(device) < 0) {
637 platform_device_put(device);
641 /* Since we dont get the return value of probe
642 * We need to check if device probing succeeded or not */
643 if (!platform_get_drvdata(device)) {
644 platform_device_unregister(device);
648 /* register device in global table */
649 platform_devices[device_count] = device;
653 static void snd_portman_detach(struct parport *p)
655 /* nothing to do here */
658 static int snd_portman_dev_probe(struct pardevice *pardev)
660 if (strcmp(pardev->name, DRIVER_NAME))
666 static struct parport_driver portman_parport_driver = {
667 .name = "portman2x4",
668 .probe = snd_portman_dev_probe,
669 .match_port = snd_portman_attach,
670 .detach = snd_portman_detach,
674 /*********************************************************************
676 *********************************************************************/
677 static void snd_portman_card_private_free(struct snd_card *card)
679 struct portman *pm = card->private_data;
680 struct pardevice *pardev = pm->pardev;
683 parport_release(pardev);
684 parport_unregister_device(pardev);
690 static int snd_portman_probe(struct platform_device *pdev)
692 struct pardevice *pardev;
695 struct snd_card *card = NULL;
696 struct portman *pm = NULL;
698 struct pardev_cb portman_cb = {
701 .irq_func = snd_portman_interrupt, /* ISR */
702 .flags = PARPORT_DEV_EXCL, /* flags */
705 p = platform_get_drvdata(pdev);
706 platform_set_drvdata(pdev, NULL);
708 if (dev >= SNDRV_CARDS)
713 err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
716 snd_printd("Cannot create card\n");
719 strcpy(card->driver, DRIVER_NAME);
720 strcpy(card->shortname, CARD_NAME);
721 sprintf(card->longname, "%s at 0x%lx, irq %i",
722 card->shortname, p->base, p->irq);
724 portman_cb.private = card; /* private */
725 pardev = parport_register_dev_model(p, /* port */
726 DRIVER_NAME, /* name */
727 &portman_cb, /* callbacks */
728 pdev->id); /* device number */
729 if (pardev == NULL) {
730 snd_printd("Cannot register pardevice\n");
736 if (parport_claim(pardev)) {
737 snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
742 err = portman_create(card, pardev, &pm);
744 snd_printd("Cannot create main component\n");
747 card->private_data = pm;
748 card->private_free = snd_portman_card_private_free;
750 err = portman_probe(p);
756 err = snd_portman_rawmidi_create(card);
758 snd_printd("Creating Rawmidi component failed\n");
763 err = portman_device_init(pm);
767 platform_set_drvdata(pdev, card);
769 /* At this point card will be usable */
770 err = snd_card_register(card);
772 snd_printd("Cannot register card\n");
776 snd_printk(KERN_INFO "Portman 2x4 on 0x%lx\n", p->base);
780 parport_release(pardev);
782 parport_unregister_device(pardev);
788 static void snd_portman_remove(struct platform_device *pdev)
790 struct snd_card *card = platform_get_drvdata(pdev);
797 static struct platform_driver snd_portman_driver = {
798 .probe = snd_portman_probe,
799 .remove_new = snd_portman_remove,
801 .name = PLATFORM_DRIVER,
805 /*********************************************************************
807 *********************************************************************/
808 static void snd_portman_unregister_all(void)
812 for (i = 0; i < SNDRV_CARDS; ++i) {
813 if (platform_devices[i]) {
814 platform_device_unregister(platform_devices[i]);
815 platform_devices[i] = NULL;
818 platform_driver_unregister(&snd_portman_driver);
819 parport_unregister_driver(&portman_parport_driver);
822 static int __init snd_portman_module_init(void)
826 err = platform_driver_register(&snd_portman_driver);
830 if (parport_register_driver(&portman_parport_driver) != 0) {
831 platform_driver_unregister(&snd_portman_driver);
835 if (device_count == 0) {
836 snd_portman_unregister_all();
843 static void __exit snd_portman_module_exit(void)
845 snd_portman_unregister_all();
848 module_init(snd_portman_module_init);
849 module_exit(snd_portman_module_exit);