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Linux 6.14-rc1
[linux-stable.git] / sound / drivers / portman2x4.c
blob5e4ef25a83a49fad582fd8545876ade9d01da1a4
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
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;
46
47 static struct platform_device *platform_devices[SNDRV_CARDS];
48 static int device_count;
49
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.");
56
57 MODULE_AUTHOR("Levent Guendogdu, Tobias Gehrig, Matthias Koenig");
58 MODULE_DESCRIPTION("Midiman Portman2x4");
59 MODULE_LICENSE("GPL");
60
61 /*********************************************************************
62 * Chip specific
63 *********************************************************************/
64 #define PORTMAN_NUM_INPUT_PORTS 2
65 #define PORTMAN_NUM_OUTPUT_PORTS 4
66
67 struct 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
77 static int portman_free(struct portman *pm)
78 {
79 kfree(pm);
80 return 0;
81 }
82
83 static 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 *********************************************************************/
180 static inline void portman_write_command(struct portman *pm, u8 value)
181 {
182 parport_write_control(pm->pardev->port, value);
183 }
184
185 static inline u8 portman_read_status(struct portman *pm)
186 {
187 return parport_read_status(pm->pardev->port);
188 }
189
190 static inline void portman_write_data(struct portman *pm, u8 value)
191 {
192 parport_write_data(pm->pardev->port, value);
193 }
194
195 static 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 */
267 static 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 */
349 static 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 */
374 static 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
420 static 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
474 static 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 *********************************************************************/
485 static int snd_portman_midi_open(struct snd_rawmidi_substream *substream)
486 {
487 return 0;
488 }
489
490 static int snd_portman_midi_close(struct snd_rawmidi_substream *substream)
491 {
492 return 0;
493 }
494
495 static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream,
496 int up)
497 {
498 struct portman *pm = substream->rmidi->private_data;
499 unsigned long flags;
500
501 spin_lock_irqsave(&pm->reg_lock, flags);
502 if (up)
503 pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED;
504 else
505 pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED;
506 spin_unlock_irqrestore(&pm->reg_lock, flags);
507 }
508
509 static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream,
510 int up)
511 {
512 struct portman *pm = substream->rmidi->private_data;
513 unsigned long flags;
514 unsigned char byte;
515
516 spin_lock_irqsave(&pm->reg_lock, flags);
517 if (up) {
518 while ((snd_rawmidi_transmit(substream, &byte, 1) == 1))
519 portman_write_midi(pm, substream->number, byte);
520 }
521 spin_unlock_irqrestore(&pm->reg_lock, flags);
522 }
523
524 static const struct snd_rawmidi_ops snd_portman_midi_output = {
525 .open = snd_portman_midi_open,
526 .close = snd_portman_midi_close,
527 .trigger = snd_portman_midi_output_trigger,
528 };
529
530 static const struct snd_rawmidi_ops snd_portman_midi_input = {
531 .open = snd_portman_midi_open,
532 .close = snd_portman_midi_close,
533 .trigger = snd_portman_midi_input_trigger,
534 };
535
536 /* Create and initialize the rawmidi component */
537 static int snd_portman_rawmidi_create(struct snd_card *card)
538 {
539 struct portman *pm = card->private_data;
540 struct snd_rawmidi *rmidi;
541 struct snd_rawmidi_substream *substream;
542 int err;
543
544 err = snd_rawmidi_new(card, CARD_NAME, 0,
545 PORTMAN_NUM_OUTPUT_PORTS,
546 PORTMAN_NUM_INPUT_PORTS,
547 &rmidi);
548 if (err < 0)
549 return err;
550
551 rmidi->private_data = pm;
552 strcpy(rmidi->name, CARD_NAME);
553 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
554 SNDRV_RAWMIDI_INFO_INPUT |
555 SNDRV_RAWMIDI_INFO_DUPLEX;
556
557 pm->rmidi = rmidi;
558
559 /* register rawmidi ops */
560 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
561 &snd_portman_midi_output);
562 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
563 &snd_portman_midi_input);
564
565 /* name substreams */
566 /* output */
567 list_for_each_entry(substream,
568 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
569 list) {
570 sprintf(substream->name,
571 "Portman2x4 %d", substream->number+1);
572 }
573 /* input */
574 list_for_each_entry(substream,
575 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
576 list) {
577 pm->midi_input[substream->number] = substream;
578 sprintf(substream->name,
579 "Portman2x4 %d", substream->number+1);
580 }
581
582 return err;
583 }
584
585 /*********************************************************************
586 * parport stuff
587 *********************************************************************/
588 static void snd_portman_interrupt(void *userdata)
589 {
590 unsigned char midivalue = 0;
591 struct portman *pm = ((struct snd_card*)userdata)->private_data;
592
593 spin_lock(&pm->reg_lock);
594
595 /* While any input data is waiting */
596 while ((portman_read_status(pm) & INT_REQ) == INT_REQ) {
597 /* If data available on channel 0,
598 read it and stuff it into the queue. */
599 if (portman_data_avail(pm, 0)) {
600 /* Read Midi */
601 midivalue = portman_read_midi(pm, 0);
602 /* put midi into queue... */
603 if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
604 snd_rawmidi_receive(pm->midi_input[0],
605 &midivalue, 1);
606
607 }
608 /* If data available on channel 1,
609 read it and stuff it into the queue. */
610 if (portman_data_avail(pm, 1)) {
611 /* Read Midi */
612 midivalue = portman_read_midi(pm, 1);
613 /* put midi into queue... */
614 if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
615 snd_rawmidi_receive(pm->midi_input[1],
616 &midivalue, 1);
617 }
618
619 }
620
621 spin_unlock(&pm->reg_lock);
622 }
623
624 static void snd_portman_attach(struct parport *p)
625 {
626 struct platform_device *device;
627
628 device = platform_device_alloc(PLATFORM_DRIVER, device_count);
629 if (!device)
630 return;
631
632 /* Temporary assignment to forward the parport */
633 platform_set_drvdata(device, p);
634
635 if (platform_device_add(device) < 0) {
636 platform_device_put(device);
637 return;
638 }
639
640 /* Since we dont get the return value of probe
641 * We need to check if device probing succeeded or not */
642 if (!platform_get_drvdata(device)) {
643 platform_device_unregister(device);
644 return;
645 }
646
647 /* register device in global table */
648 platform_devices[device_count] = device;
649 device_count++;
650 }
651
652 static void snd_portman_detach(struct parport *p)
653 {
654 /* nothing to do here */
655 }
656
657 static int snd_portman_dev_probe(struct pardevice *pardev)
658 {
659 if (strcmp(pardev->name, DRIVER_NAME))
660 return -ENODEV;
661
662 return 0;
663 }
664
665 static struct parport_driver portman_parport_driver = {
666 .name = "portman2x4",
667 .probe = snd_portman_dev_probe,
668 .match_port = snd_portman_attach,
669 .detach = snd_portman_detach,
670 };
671
672 /*********************************************************************
673 * platform stuff
674 *********************************************************************/
675 static void snd_portman_card_private_free(struct snd_card *card)
676 {
677 struct portman *pm = card->private_data;
678 struct pardevice *pardev = pm->pardev;
679
680 if (pardev) {
681 parport_release(pardev);
682 parport_unregister_device(pardev);
683 }
684
685 portman_free(pm);
686 }
687
688 static int snd_portman_probe(struct platform_device *pdev)
689 {
690 struct pardevice *pardev;
691 struct parport *p;
692 int dev = pdev->id;
693 struct snd_card *card = NULL;
694 struct portman *pm = NULL;
695 int err;
696 struct pardev_cb portman_cb = {
697 .preempt = NULL,
698 .wakeup = NULL,
699 .irq_func = snd_portman_interrupt, /* ISR */
700 .flags = PARPORT_DEV_EXCL, /* flags */
701 };
702
703 p = platform_get_drvdata(pdev);
704 platform_set_drvdata(pdev, NULL);
705
706 if (dev >= SNDRV_CARDS)
707 return -ENODEV;
708 if (!enable[dev])
709 return -ENOENT;
710
711 err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
712 0, &card);
713 if (err < 0) {
714 dev_dbg(&pdev->dev, "Cannot create card\n");
715 return err;
716 }
717 strcpy(card->driver, DRIVER_NAME);
718 strcpy(card->shortname, CARD_NAME);
719 sprintf(card->longname, "%s at 0x%lx, irq %i",
720 card->shortname, p->base, p->irq);
721
722 portman_cb.private = card; /* private */
723 pardev = parport_register_dev_model(p, /* port */
724 DRIVER_NAME, /* name */
725 &portman_cb, /* callbacks */
726 pdev->id); /* device number */
727 if (pardev == NULL) {
728 dev_dbg(card->dev, "Cannot register pardevice\n");
729 err = -EIO;
730 goto __err;
731 }
732
733 /* claim parport */
734 if (parport_claim(pardev)) {
735 dev_dbg(card->dev, "Cannot claim parport 0x%lx\n", pardev->port->base);
736 err = -EIO;
737 goto free_pardev;
738 }
739
740 err = portman_create(card, pardev, &pm);
741 if (err < 0) {
742 dev_dbg(card->dev, "Cannot create main component\n");
743 goto release_pardev;
744 }
745 card->private_data = pm;
746 card->private_free = snd_portman_card_private_free;
747
748 err = portman_probe(p);
749 if (err) {
750 err = -EIO;
751 goto __err;
752 }
753
754 err = snd_portman_rawmidi_create(card);
755 if (err < 0) {
756 dev_dbg(card->dev, "Creating Rawmidi component failed\n");
757 goto __err;
758 }
759
760 /* init device */
761 err = portman_device_init(pm);
762 if (err < 0)
763 goto __err;
764
765 platform_set_drvdata(pdev, card);
766
767 /* At this point card will be usable */
768 err = snd_card_register(card);
769 if (err < 0) {
770 dev_dbg(card->dev, "Cannot register card\n");
771 goto __err;
772 }
773
774 dev_info(card->dev, "Portman 2x4 on 0x%lx\n", p->base);
775 return 0;
776
777 release_pardev:
778 parport_release(pardev);
779 free_pardev:
780 parport_unregister_device(pardev);
781 __err:
782 snd_card_free(card);
783 return err;
784 }
785
786 static void snd_portman_remove(struct platform_device *pdev)
787 {
788 struct snd_card *card = platform_get_drvdata(pdev);
789
790 if (card)
791 snd_card_free(card);
792 }
793
794
795 static struct platform_driver snd_portman_driver = {
796 .probe = snd_portman_probe,
797 .remove = snd_portman_remove,
798 .driver = {
799 .name = PLATFORM_DRIVER,
800 }
801 };
802
803 /*********************************************************************
804 * module init stuff
805 *********************************************************************/
806 static void snd_portman_unregister_all(void)
807 {
808 int i;
809
810 for (i = 0; i < SNDRV_CARDS; ++i) {
811 if (platform_devices[i]) {
812 platform_device_unregister(platform_devices[i]);
813 platform_devices[i] = NULL;
814 }
815 }
816 platform_driver_unregister(&snd_portman_driver);
817 parport_unregister_driver(&portman_parport_driver);
818 }
819
820 static int __init snd_portman_module_init(void)
821 {
822 int err;
823
824 err = platform_driver_register(&snd_portman_driver);
825 if (err < 0)
826 return err;
827
828 if (parport_register_driver(&portman_parport_driver) != 0) {
829 platform_driver_unregister(&snd_portman_driver);
830 return -EIO;
831 }
832
833 if (device_count == 0) {
834 snd_portman_unregister_all();
835 return -ENODEV;
836 }
837
838 return 0;
839 }
840
841 static void __exit snd_portman_module_exit(void)
842 {
843 snd_portman_unregister_all();
844 }
845
846 module_init(snd_portman_module_init);
847 module_exit(snd_portman_module_exit);
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