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");
60 MODULE_SUPPORTED_DEVICE("{{Midiman,Portman2x4}}");
62 /*********************************************************************
64 *********************************************************************/
65 #define PORTMAN_NUM_INPUT_PORTS 2
66 #define PORTMAN_NUM_OUTPUT_PORTS 4
70 struct snd_card *card;
71 struct snd_rawmidi *rmidi;
72 struct pardevice *pardev;
74 int mode[PORTMAN_NUM_INPUT_PORTS];
75 struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS];
78 static int portman_free(struct portman *pm)
84 static int portman_create(struct snd_card *card,
85 struct pardevice *pardev,
86 struct portman **rchip)
92 pm = kzalloc(sizeof(struct portman), GFP_KERNEL);
96 /* Init chip specific data */
97 spin_lock_init(&pm->reg_lock);
106 /*********************************************************************
107 * HW related constants
108 *********************************************************************/
110 /* Standard PC parallel port status register equates. */
111 #define PP_STAT_BSY 0x80 /* Busy status. Inverted. */
112 #define PP_STAT_ACK 0x40 /* Acknowledge. Non-Inverted. */
113 #define PP_STAT_POUT 0x20 /* Paper Out. Non-Inverted. */
114 #define PP_STAT_SEL 0x10 /* Select. Non-Inverted. */
115 #define PP_STAT_ERR 0x08 /* Error. Non-Inverted. */
117 /* Standard PC parallel port command register equates. */
118 #define PP_CMD_IEN 0x10 /* IRQ Enable. Non-Inverted. */
119 #define PP_CMD_SELI 0x08 /* Select Input. Inverted. */
120 #define PP_CMD_INIT 0x04 /* Init Printer. Non-Inverted. */
121 #define PP_CMD_FEED 0x02 /* Auto Feed. Inverted. */
122 #define PP_CMD_STB 0x01 /* Strobe. Inverted. */
124 /* Parallel Port Command Register as implemented by PCP2x4. */
125 #define INT_EN PP_CMD_IEN /* Interrupt enable. */
126 #define STROBE PP_CMD_STB /* Command strobe. */
128 /* The parallel port command register field (b1..b3) selects the
129 * various "registers" within the PC/P 2x4. These are the internal
130 * address of these "registers" that must be written to the parallel
131 * port command register.
133 #define RXDATA0 (0 << 1) /* PCP RxData channel 0. */
134 #define RXDATA1 (1 << 1) /* PCP RxData channel 1. */
135 #define GEN_CTL (2 << 1) /* PCP General Control Register. */
136 #define SYNC_CTL (3 << 1) /* PCP Sync Control Register. */
137 #define TXDATA0 (4 << 1) /* PCP TxData channel 0. */
138 #define TXDATA1 (5 << 1) /* PCP TxData channel 1. */
139 #define TXDATA2 (6 << 1) /* PCP TxData channel 2. */
140 #define TXDATA3 (7 << 1) /* PCP TxData channel 3. */
142 /* Parallel Port Status Register as implemented by PCP2x4. */
143 #define ESTB PP_STAT_POUT /* Echoed strobe. */
144 #define INT_REQ PP_STAT_ACK /* Input data int request. */
145 #define BUSY PP_STAT_ERR /* Interface Busy. */
147 /* Parallel Port Status Register BUSY and SELECT lines are multiplexed
148 * between several functions. Depending on which 2x4 "register" is
149 * currently selected (b1..b3), the BUSY and SELECT lines are
150 * assigned as follows:
152 * SELECT LINE: A3 A2 A1
155 #define RXAVAIL PP_STAT_SEL /* Rx Available, channel 0. 0 0 0 */
156 // RXAVAIL1 PP_STAT_SEL /* Rx Available, channel 1. 0 0 1 */
157 #define SYNC_STAT PP_STAT_SEL /* Reserved - Sync Status. 0 1 0 */
158 // /* Reserved. 0 1 1 */
159 #define TXEMPTY PP_STAT_SEL /* Tx Empty, channel 0. 1 0 0 */
160 // TXEMPTY1 PP_STAT_SEL /* Tx Empty, channel 1. 1 0 1 */
161 // TXEMPTY2 PP_STAT_SEL /* Tx Empty, channel 2. 1 1 0 */
162 // TXEMPTY3 PP_STAT_SEL /* Tx Empty, channel 3. 1 1 1 */
164 /* BUSY LINE: A3 A2 A1
167 #define RXDATA PP_STAT_BSY /* Rx Input Data, channel 0. 0 0 0 */
168 // RXDATA1 PP_STAT_BSY /* Rx Input Data, channel 1. 0 0 1 */
169 #define SYNC_DATA PP_STAT_BSY /* Reserved - Sync Data. 0 1 0 */
170 /* Reserved. 0 1 1 */
171 #define DATA_ECHO PP_STAT_BSY /* Parallel Port Data Echo. 1 0 0 */
172 #define A0_ECHO PP_STAT_BSY /* Address 0 Echo. 1 0 1 */
173 #define A1_ECHO PP_STAT_BSY /* Address 1 Echo. 1 1 0 */
174 #define A2_ECHO PP_STAT_BSY /* Address 2 Echo. 1 1 1 */
176 #define PORTMAN2X4_MODE_INPUT_TRIGGERED 0x01
178 /*********************************************************************
179 * Hardware specific functions
180 *********************************************************************/
181 static inline void portman_write_command(struct portman *pm, u8 value)
183 parport_write_control(pm->pardev->port, value);
186 static inline u8 portman_read_command(struct portman *pm)
188 return parport_read_control(pm->pardev->port);
191 static inline u8 portman_read_status(struct portman *pm)
193 return parport_read_status(pm->pardev->port);
196 static inline u8 portman_read_data(struct portman *pm)
198 return parport_read_data(pm->pardev->port);
201 static inline void portman_write_data(struct portman *pm, u8 value)
203 parport_write_data(pm->pardev->port, value);
206 static void portman_write_midi(struct portman *pm,
207 int port, u8 mididata)
209 int command = ((port + 4) << 1);
211 /* Get entering data byte and port number in BL and BH respectively.
212 * Set up Tx Channel address field for use with PP Cmd Register.
213 * Store address field in BH register.
214 * Inputs: AH = Output port number (0..3).
216 * command = TXDATA0 | INT_EN;
217 * Align port num with address field (b1...b3),
218 * set address for TXDatax, Strobe=0
222 /* Disable interrupts so that the process is not interrupted, then
223 * write the address associated with the current Tx channel to the
224 * PP Command Reg. Do not set the Strobe signal yet.
228 portman_write_command(pm, command);
230 /* While the address lines settle, write parallel output data to
231 * PP Data Reg. This has no effect until Strobe signal is asserted.
234 portman_write_data(pm, mididata);
236 /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
237 * Status Register), then go write data. Else go back and wait.
239 } while ((portman_read_status(pm) & TXEMPTY) != TXEMPTY);
241 /* TxEmpty is set. Maintain PC/P destination address and assert
242 * Strobe through the PP Command Reg. This will Strobe data into
243 * the PC/P transmitter and set the PC/P BUSY signal.
246 portman_write_command(pm, command | STROBE);
248 /* Wait for strobe line to settle and echo back through hardware.
249 * Once it has echoed back, assume that the address and data lines
253 while ((portman_read_status(pm) & ESTB) == 0)
256 /* Release strobe and immediately re-allow interrupts. */
257 portman_write_command(pm, command);
259 while ((portman_read_status(pm) & ESTB) == ESTB)
262 /* PC/P BUSY is now set. We must wait until BUSY resets itself.
263 * We'll reenable ints while we're waiting.
266 while ((portman_read_status(pm) & BUSY) == BUSY)
274 * Read MIDI byte from port
275 * Attempt to read input byte from specified hardware input port (0..).
276 * Return -1 if no data
278 static int portman_read_midi(struct portman *pm, int port)
280 unsigned char midi_data = 0;
281 unsigned char cmdout; /* Saved address+IE bit. */
283 /* Make sure clocking edge is down before starting... */
284 portman_write_data(pm, 0); /* Make sure edge is down. */
286 /* Set destination address to PCP. */
287 cmdout = (port << 1) | INT_EN; /* Address + IE + No Strobe. */
288 portman_write_command(pm, cmdout);
290 while ((portman_read_status(pm) & ESTB) == ESTB)
291 cpu_relax(); /* Wait for strobe echo. */
293 /* After the address lines settle, check multiplexed RxAvail signal.
294 * If data is available, read it.
296 if ((portman_read_status(pm) & RXAVAIL) == 0)
297 return -1; /* No data. */
299 /* Set the Strobe signal to enable the Rx clocking circuitry. */
300 portman_write_command(pm, cmdout | STROBE); /* Write address+IE+Strobe. */
302 while ((portman_read_status(pm) & ESTB) == 0)
303 cpu_relax(); /* Wait for strobe echo. */
305 /* The first data bit (msb) is already sitting on the input line. */
306 midi_data = (portman_read_status(pm) & 128);
307 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
310 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
311 midi_data |= (portman_read_status(pm) >> 1) & 64;
312 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
315 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
316 midi_data |= (portman_read_status(pm) >> 2) & 32;
317 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
320 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
321 midi_data |= (portman_read_status(pm) >> 3) & 16;
322 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
325 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
326 midi_data |= (portman_read_status(pm) >> 4) & 8;
327 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
330 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
331 midi_data |= (portman_read_status(pm) >> 5) & 4;
332 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
335 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
336 midi_data |= (portman_read_status(pm) >> 6) & 2;
337 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
340 portman_write_data(pm, 0); /* Cause falling edge while data settles. */
341 midi_data |= (portman_read_status(pm) >> 7) & 1;
342 portman_write_data(pm, 1); /* Cause rising edge, which shifts data. */
343 portman_write_data(pm, 0); /* Return data clock low. */
346 /* De-assert Strobe and return data. */
347 portman_write_command(pm, cmdout); /* Output saved address+IE. */
349 /* Wait for strobe echo. */
350 while ((portman_read_status(pm) & ESTB) == ESTB)
353 return (midi_data & 255); /* Shift back and return value. */
357 * Checks if any input data on the given channel is available
360 static int portman_data_avail(struct portman *pm, int channel)
362 int command = INT_EN;
371 /* Write hardware (assumme STROBE=0) */
372 portman_write_command(pm, command);
373 /* Check multiplexed RxAvail signal */
374 if ((portman_read_status(pm) & RXAVAIL) == RXAVAIL)
375 return 1; /* Data available */
377 /* No Data available */
385 static void portman_flush_input(struct portman *pm, unsigned char port)
387 /* Local variable for counting things */
389 unsigned char command = 0;
399 snd_printk(KERN_WARNING
400 "portman_flush_input() Won't flush port %i\n",
405 /* Set address for specified channel in port and allow to settle. */
406 portman_write_command(pm, command);
408 /* Assert the Strobe and wait for echo back. */
409 portman_write_command(pm, command | STROBE);
412 while ((portman_read_status(pm) & ESTB) == 0)
415 /* Output clock cycles to the Rx circuitry. */
416 portman_write_data(pm, 0);
418 /* Flush 250 bits... */
419 for (i = 0; i < 250; i++) {
420 portman_write_data(pm, 1);
421 portman_write_data(pm, 0);
424 /* Deassert the Strobe signal of the port and wait for it to settle. */
425 portman_write_command(pm, command | INT_EN);
427 /* Wait for settling */
428 while ((portman_read_status(pm) & ESTB) == ESTB)
432 static int portman_probe(struct parport *p)
434 /* Initialize the parallel port data register. Will set Rx clocks
435 * low in case we happen to be addressing the Rx ports at this time.
438 parport_write_data(p, 0);
440 /* Initialize the parallel port command register, thus initializing
441 * hardware handshake lines to midi box:
444 * Interrupt Enable = 0
447 parport_write_control(p, 0);
449 /* Check if Portman PC/P 2x4 is out there. */
451 parport_write_control(p, RXDATA0); /* Write Strobe=0 to command reg. */
453 /* Check for ESTB to be clear */
455 if ((parport_read_status(p) & ESTB) == ESTB)
456 return 1; /* CODE 1 - Strobe Failure. */
458 /* Set for RXDATA0 where no damage will be done. */
460 parport_write_control(p, RXDATA0 | STROBE); /* Write Strobe=1 to command reg. */
463 if ((parport_read_status(p) & ESTB) != ESTB)
464 return 1; /* CODE 1 - Strobe Failure. */
467 parport_write_control(p, 0); /* Reset Strobe=0. */
469 /* Check if Tx circuitry is functioning properly. If initialized
470 * unit TxEmpty is false, send out char and see if it goes true.
473 parport_write_control(p, TXDATA0); /* Tx channel 0, strobe off. */
475 /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
476 * Status Register), then go write data. Else go back and wait.
479 if ((parport_read_status(p) & TXEMPTY) == 0)
482 /* Return OK status. */
486 static int portman_device_init(struct portman *pm)
488 portman_flush_input(pm, 0);
489 portman_flush_input(pm, 1);
494 /*********************************************************************
496 *********************************************************************/
497 static int snd_portman_midi_open(struct snd_rawmidi_substream *substream)
502 static int snd_portman_midi_close(struct snd_rawmidi_substream *substream)
507 static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream,
510 struct portman *pm = substream->rmidi->private_data;
513 spin_lock_irqsave(&pm->reg_lock, flags);
515 pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED;
517 pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED;
518 spin_unlock_irqrestore(&pm->reg_lock, flags);
521 static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream,
524 struct portman *pm = substream->rmidi->private_data;
528 spin_lock_irqsave(&pm->reg_lock, flags);
530 while ((snd_rawmidi_transmit(substream, &byte, 1) == 1))
531 portman_write_midi(pm, substream->number, byte);
533 spin_unlock_irqrestore(&pm->reg_lock, flags);
536 static const struct snd_rawmidi_ops snd_portman_midi_output = {
537 .open = snd_portman_midi_open,
538 .close = snd_portman_midi_close,
539 .trigger = snd_portman_midi_output_trigger,
542 static const struct snd_rawmidi_ops snd_portman_midi_input = {
543 .open = snd_portman_midi_open,
544 .close = snd_portman_midi_close,
545 .trigger = snd_portman_midi_input_trigger,
548 /* Create and initialize the rawmidi component */
549 static int snd_portman_rawmidi_create(struct snd_card *card)
551 struct portman *pm = card->private_data;
552 struct snd_rawmidi *rmidi;
553 struct snd_rawmidi_substream *substream;
556 err = snd_rawmidi_new(card, CARD_NAME, 0,
557 PORTMAN_NUM_OUTPUT_PORTS,
558 PORTMAN_NUM_INPUT_PORTS,
563 rmidi->private_data = pm;
564 strcpy(rmidi->name, CARD_NAME);
565 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
566 SNDRV_RAWMIDI_INFO_INPUT |
567 SNDRV_RAWMIDI_INFO_DUPLEX;
571 /* register rawmidi ops */
572 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
573 &snd_portman_midi_output);
574 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
575 &snd_portman_midi_input);
577 /* name substreams */
579 list_for_each_entry(substream,
580 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
582 sprintf(substream->name,
583 "Portman2x4 %d", substream->number+1);
586 list_for_each_entry(substream,
587 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
589 pm->midi_input[substream->number] = substream;
590 sprintf(substream->name,
591 "Portman2x4 %d", substream->number+1);
597 /*********************************************************************
599 *********************************************************************/
600 static void snd_portman_interrupt(void *userdata)
602 unsigned char midivalue = 0;
603 struct portman *pm = ((struct snd_card*)userdata)->private_data;
605 spin_lock(&pm->reg_lock);
607 /* While any input data is waiting */
608 while ((portman_read_status(pm) & INT_REQ) == INT_REQ) {
609 /* If data available on channel 0,
610 read it and stuff it into the queue. */
611 if (portman_data_avail(pm, 0)) {
613 midivalue = portman_read_midi(pm, 0);
614 /* put midi into queue... */
615 if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
616 snd_rawmidi_receive(pm->midi_input[0],
620 /* If data available on channel 1,
621 read it and stuff it into the queue. */
622 if (portman_data_avail(pm, 1)) {
624 midivalue = portman_read_midi(pm, 1);
625 /* put midi into queue... */
626 if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
627 snd_rawmidi_receive(pm->midi_input[1],
633 spin_unlock(&pm->reg_lock);
636 static void snd_portman_attach(struct parport *p)
638 struct platform_device *device;
640 device = platform_device_alloc(PLATFORM_DRIVER, device_count);
644 /* Temporary assignment to forward the parport */
645 platform_set_drvdata(device, p);
647 if (platform_device_add(device) < 0) {
648 platform_device_put(device);
652 /* Since we dont get the return value of probe
653 * We need to check if device probing succeeded or not */
654 if (!platform_get_drvdata(device)) {
655 platform_device_unregister(device);
659 /* register device in global table */
660 platform_devices[device_count] = device;
664 static void snd_portman_detach(struct parport *p)
666 /* nothing to do here */
669 static int snd_portman_dev_probe(struct pardevice *pardev)
671 if (strcmp(pardev->name, DRIVER_NAME))
677 static struct parport_driver portman_parport_driver = {
678 .name = "portman2x4",
679 .probe = snd_portman_dev_probe,
680 .match_port = snd_portman_attach,
681 .detach = snd_portman_detach,
685 /*********************************************************************
687 *********************************************************************/
688 static void snd_portman_card_private_free(struct snd_card *card)
690 struct portman *pm = card->private_data;
691 struct pardevice *pardev = pm->pardev;
694 parport_release(pardev);
695 parport_unregister_device(pardev);
701 static int snd_portman_probe(struct platform_device *pdev)
703 struct pardevice *pardev;
706 struct snd_card *card = NULL;
707 struct portman *pm = NULL;
709 struct pardev_cb portman_cb = {
712 .irq_func = snd_portman_interrupt, /* ISR */
713 .flags = PARPORT_DEV_EXCL, /* flags */
716 p = platform_get_drvdata(pdev);
717 platform_set_drvdata(pdev, NULL);
719 if (dev >= SNDRV_CARDS)
724 err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
727 snd_printd("Cannot create card\n");
730 strcpy(card->driver, DRIVER_NAME);
731 strcpy(card->shortname, CARD_NAME);
732 sprintf(card->longname, "%s at 0x%lx, irq %i",
733 card->shortname, p->base, p->irq);
735 portman_cb.private = card; /* private */
736 pardev = parport_register_dev_model(p, /* port */
737 DRIVER_NAME, /* name */
738 &portman_cb, /* callbacks */
739 pdev->id); /* device number */
740 if (pardev == NULL) {
741 snd_printd("Cannot register pardevice\n");
747 if (parport_claim(pardev)) {
748 snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
753 if ((err = portman_create(card, pardev, &pm)) < 0) {
754 snd_printd("Cannot create main component\n");
757 card->private_data = pm;
758 card->private_free = snd_portman_card_private_free;
760 err = portman_probe(p);
766 if ((err = snd_portman_rawmidi_create(card)) < 0) {
767 snd_printd("Creating Rawmidi component failed\n");
772 if ((err = portman_device_init(pm)) < 0)
775 platform_set_drvdata(pdev, card);
777 /* At this point card will be usable */
778 if ((err = snd_card_register(card)) < 0) {
779 snd_printd("Cannot register card\n");
783 snd_printk(KERN_INFO "Portman 2x4 on 0x%lx\n", p->base);
787 parport_release(pardev);
789 parport_unregister_device(pardev);
795 static int snd_portman_remove(struct platform_device *pdev)
797 struct snd_card *card = platform_get_drvdata(pdev);
806 static struct platform_driver snd_portman_driver = {
807 .probe = snd_portman_probe,
808 .remove = snd_portman_remove,
810 .name = PLATFORM_DRIVER,
814 /*********************************************************************
816 *********************************************************************/
817 static void snd_portman_unregister_all(void)
821 for (i = 0; i < SNDRV_CARDS; ++i) {
822 if (platform_devices[i]) {
823 platform_device_unregister(platform_devices[i]);
824 platform_devices[i] = NULL;
827 platform_driver_unregister(&snd_portman_driver);
828 parport_unregister_driver(&portman_parport_driver);
831 static int __init snd_portman_module_init(void)
835 if ((err = platform_driver_register(&snd_portman_driver)) < 0)
838 if (parport_register_driver(&portman_parport_driver) != 0) {
839 platform_driver_unregister(&snd_portman_driver);
843 if (device_count == 0) {
844 snd_portman_unregister_all();
851 static void __exit snd_portman_module_exit(void)
853 snd_portman_unregister_all();
856 module_init(snd_portman_module_init);
857 module_exit(snd_portman_module_exit);