Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/sound/drivers/portman2x4.c

  1 /*
  2  *   Driver for Midiman Portman2x4 parallel port midi interface
  3  *
  4  *   Copyright (c) by Levent Guendogdu <levon@feature-it.com>
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 19  *
 20  * ChangeLog
 21  * Jan 24 2007 Matthias Koenig <mkoenig@suse.de>
 22  *      - cleanup and rewrite
 23  * Sep 30 2004 Tobias Gehrig <tobias@gehrig.tk>
 24  *      - source code cleanup
 25  * Sep 03 2004 Tobias Gehrig <tobias@gehrig.tk>
 26  *      - fixed compilation problem with alsa 1.0.6a (removed MODULE_CLASSES,
 27  *        MODULE_PARM_SYNTAX and changed MODULE_DEVICES to
 28  *        MODULE_SUPPORTED_DEVICE)
 29  * Mar 24 2004 Tobias Gehrig <tobias@gehrig.tk>
 30  *      - added 2.6 kernel support
 31  * Mar 18 2004 Tobias Gehrig <tobias@gehrig.tk>
 32  *      - added parport_unregister_driver to the startup routine if the driver fails to detect a portman
 33  *      - added support for all 4 output ports in portman_putmidi
 34  * Mar 17 2004 Tobias Gehrig <tobias@gehrig.tk>
 35  *      - added checks for opened input device in interrupt handler
 36  * Feb 20 2004 Tobias Gehrig <tobias@gehrig.tk>
 37  *      - ported from alsa 0.5 to 1.0
 38  */
 39 
 40 #include <linux/init.h>
 41 #include <linux/platform_device.h>
 42 #include <linux/parport.h>
 43 #include <linux/spinlock.h>
 44 #include <linux/delay.h>
 45 #include <linux/slab.h>
 46 #include <linux/module.h>
 47 #include <sound/core.h>
 48 #include <sound/initval.h>
 49 #include <sound/rawmidi.h>
 50 #include <sound/control.h>
 51 
 52 #define CARD_NAME "Portman 2x4"
 53 #define DRIVER_NAME "portman"
 54 #define PLATFORM_DRIVER "snd_portman2x4"
 55 
 56 static int index[SNDRV_CARDS]  = SNDRV_DEFAULT_IDX;
 57 static char *id[SNDRV_CARDS]   = SNDRV_DEFAULT_STR;
 58 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 59 
 60 static struct platform_device *platform_devices[SNDRV_CARDS]; 
 61 static int device_count;
 62 
 63 module_param_array(index, int, NULL, S_IRUGO);
 64 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
 65 module_param_array(id, charp, NULL, S_IRUGO);
 66 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
 67 module_param_array(enable, bool, NULL, S_IRUGO);
 68 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
 69 
 70 MODULE_AUTHOR("Levent Guendogdu, Tobias Gehrig, Matthias Koenig");
 71 MODULE_DESCRIPTION("Midiman Portman2x4");
 72 MODULE_LICENSE("GPL");
 73 MODULE_SUPPORTED_DEVICE("{{Midiman,Portman2x4}}");
 74 
 75 /*********************************************************************
 76  * Chip specific
 77  *********************************************************************/
 78 #define PORTMAN_NUM_INPUT_PORTS 2
 79 #define PORTMAN_NUM_OUTPUT_PORTS 4
 80 
 81 struct portman {
 82         spinlock_t reg_lock;
 83         struct snd_card *card;
 84         struct snd_rawmidi *rmidi;
 85         struct pardevice *pardev;
 86         int pardev_claimed;
 87 
 88         int open_count;
 89         int mode[PORTMAN_NUM_INPUT_PORTS];
 90         struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS];
 91 };
 92 
 93 static int portman_free(struct portman *pm)
 94 {
 95         kfree(pm);
 96         return 0;
 97 }
 98 
 99 static int portman_create(struct snd_card *card,
100                           struct pardevice *pardev,
101                           struct portman **rchip)
102 {
103         struct portman *pm;
104 
105         *rchip = NULL;
106 
107         pm = kzalloc(sizeof(struct portman), GFP_KERNEL);
108         if (pm == NULL) 
109                 return -ENOMEM;
110 
111         /* Init chip specific data */
112         spin_lock_init(&pm->reg_lock);
113         pm->card = card;
114         pm->pardev = pardev;
115 
116         *rchip = pm;
117 
118         return 0;
119 }
120 
121 /*********************************************************************
122  * HW related constants
123  *********************************************************************/
124 
125 /* Standard PC parallel port status register equates. */
126 #define PP_STAT_BSY     0x80    /* Busy status.  Inverted. */
127 #define PP_STAT_ACK     0x40    /* Acknowledge.  Non-Inverted. */
128 #define PP_STAT_POUT    0x20    /* Paper Out.    Non-Inverted. */
129 #define PP_STAT_SEL     0x10    /* Select.       Non-Inverted. */
130 #define PP_STAT_ERR     0x08    /* Error.        Non-Inverted. */
131 
132 /* Standard PC parallel port command register equates. */
133 #define PP_CMD_IEN      0x10    /* IRQ Enable.   Non-Inverted. */
134 #define PP_CMD_SELI     0x08    /* Select Input. Inverted. */
135 #define PP_CMD_INIT     0x04    /* Init Printer. Non-Inverted. */
136 #define PP_CMD_FEED     0x02    /* Auto Feed.    Inverted. */
137 #define PP_CMD_STB      0x01    /* Strobe.       Inverted. */
138 
139 /* Parallel Port Command Register as implemented by PCP2x4. */
140 #define INT_EN          PP_CMD_IEN      /* Interrupt enable. */
141 #define STROBE          PP_CMD_STB      /* Command strobe. */
142 
143 /* The parallel port command register field (b1..b3) selects the 
144  * various "registers" within the PC/P 2x4.  These are the internal
145  * address of these "registers" that must be written to the parallel
146  * port command register.
147  */
148 #define RXDATA0         (0 << 1)        /* PCP RxData channel 0. */
149 #define RXDATA1         (1 << 1)        /* PCP RxData channel 1. */
150 #define GEN_CTL         (2 << 1)        /* PCP General Control Register. */
151 #define SYNC_CTL        (3 << 1)        /* PCP Sync Control Register. */
152 #define TXDATA0         (4 << 1)        /* PCP TxData channel 0. */
153 #define TXDATA1         (5 << 1)        /* PCP TxData channel 1. */
154 #define TXDATA2         (6 << 1)        /* PCP TxData channel 2. */
155 #define TXDATA3         (7 << 1)        /* PCP TxData channel 3. */
156 
157 /* Parallel Port Status Register as implemented by PCP2x4. */
158 #define ESTB            PP_STAT_POUT    /* Echoed strobe. */
159 #define INT_REQ         PP_STAT_ACK     /* Input data int request. */
160 #define BUSY            PP_STAT_ERR     /* Interface Busy. */
161 
162 /* Parallel Port Status Register BUSY and SELECT lines are multiplexed
163  * between several functions.  Depending on which 2x4 "register" is
164  * currently selected (b1..b3), the BUSY and SELECT lines are
165  * assigned as follows:
166  *
167  *   SELECT LINE:                                                    A3 A2 A1
168  *                                                                   --------
169  */
170 #define RXAVAIL         PP_STAT_SEL     /* Rx Available, channel 0.   0 0 0 */
171 //  RXAVAIL1    PP_STAT_SEL             /* Rx Available, channel 1.   0 0 1 */
172 #define SYNC_STAT       PP_STAT_SEL     /* Reserved - Sync Status.    0 1 0 */
173 //                                      /* Reserved.                  0 1 1 */
174 #define TXEMPTY         PP_STAT_SEL     /* Tx Empty, channel 0.       1 0 0 */
175 //      TXEMPTY1        PP_STAT_SEL     /* Tx Empty, channel 1.       1 0 1 */
176 //  TXEMPTY2    PP_STAT_SEL             /* Tx Empty, channel 2.       1 1 0 */
177 //  TXEMPTY3    PP_STAT_SEL             /* Tx Empty, channel 3.       1 1 1 */
178 
179 /*   BUSY LINE:                                                      A3 A2 A1
180  *                                                                   --------
181  */
182 #define RXDATA          PP_STAT_BSY     /* Rx Input Data, channel 0.  0 0 0 */
183 //      RXDATA1         PP_STAT_BSY     /* Rx Input Data, channel 1.  0 0 1 */
184 #define SYNC_DATA       PP_STAT_BSY     /* Reserved - Sync Data.      0 1 0 */
185                                         /* Reserved.                  0 1 1 */
186 #define DATA_ECHO       PP_STAT_BSY     /* Parallel Port Data Echo.   1 0 0 */
187 #define A0_ECHO         PP_STAT_BSY     /* Address 0 Echo.            1 0 1 */
188 #define A1_ECHO         PP_STAT_BSY     /* Address 1 Echo.            1 1 0 */
189 #define A2_ECHO         PP_STAT_BSY     /* Address 2 Echo.            1 1 1 */
190 
191 #define PORTMAN2X4_MODE_INPUT_TRIGGERED  0x01
192 
193 /*********************************************************************
194  * Hardware specific functions
195  *********************************************************************/
196 static inline void portman_write_command(struct portman *pm, u8 value)
197 {
198         parport_write_control(pm->pardev->port, value);
199 }
200 
201 static inline u8 portman_read_command(struct portman *pm)
202 {
203         return parport_read_control(pm->pardev->port);
204 }
205 
206 static inline u8 portman_read_status(struct portman *pm)
207 {
208         return parport_read_status(pm->pardev->port);
209 }
210 
211 static inline u8 portman_read_data(struct portman *pm)
212 {
213         return parport_read_data(pm->pardev->port);
214 }
215 
216 static inline void portman_write_data(struct portman *pm, u8 value)
217 {
218         parport_write_data(pm->pardev->port, value);
219 }
220 
221 static void portman_write_midi(struct portman *pm, 
222                                int port, u8 mididata)
223 {
224         int command = ((port + 4) << 1);
225 
226         /* Get entering data byte and port number in BL and BH respectively.
227          * Set up Tx Channel address field for use with PP Cmd Register.
228          * Store address field in BH register.
229          * Inputs:      AH = Output port number (0..3).
230          *              AL = Data byte.
231          *    command = TXDATA0 | INT_EN;
232          * Align port num with address field (b1...b3),
233          * set address for TXDatax, Strobe=0
234          */
235         command |= INT_EN;
236 
237         /* Disable interrupts so that the process is not interrupted, then 
238          * write the address associated with the current Tx channel to the 
239          * PP Command Reg.  Do not set the Strobe signal yet.
240          */
241 
242         do {
243                 portman_write_command(pm, command);
244 
245                 /* While the address lines settle, write parallel output data to 
246                  * PP Data Reg.  This has no effect until Strobe signal is asserted.
247                  */
248 
249                 portman_write_data(pm, mididata);
250                 
251                 /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
252                  * Status Register), then go write data.  Else go back and wait.
253                  */
254         } while ((portman_read_status(pm) & TXEMPTY) != TXEMPTY);
255 
256         /* TxEmpty is set.  Maintain PC/P destination address and assert
257          * Strobe through the PP Command Reg.  This will Strobe data into
258          * the PC/P transmitter and set the PC/P BUSY signal.
259          */
260 
261         portman_write_command(pm, command | STROBE);
262 
263         /* Wait for strobe line to settle and echo back through hardware.
264          * Once it has echoed back, assume that the address and data lines
265          * have settled!
266          */
267 
268         while ((portman_read_status(pm) & ESTB) == 0)
269                 cpu_relax();
270 
271         /* Release strobe and immediately re-allow interrupts. */
272         portman_write_command(pm, command);
273 
274         while ((portman_read_status(pm) & ESTB) == ESTB)
275                 cpu_relax();
276 
277         /* PC/P BUSY is now set.  We must wait until BUSY resets itself.
278          * We'll reenable ints while we're waiting.
279          */
280 
281         while ((portman_read_status(pm) & BUSY) == BUSY)
282                 cpu_relax();
283 
284         /* Data sent. */
285 }
286 
287 
288 /*
289  *  Read MIDI byte from port
290  *  Attempt to read input byte from specified hardware input port (0..).
291  *  Return -1 if no data
292  */
293 static int portman_read_midi(struct portman *pm, int port)
294 {
295         unsigned char midi_data = 0;
296         unsigned char cmdout;   /* Saved address+IE bit. */
297 
298         /* Make sure clocking edge is down before starting... */
299         portman_write_data(pm, 0);      /* Make sure edge is down. */
300 
301         /* Set destination address to PCP. */
302         cmdout = (port << 1) | INT_EN;  /* Address + IE + No Strobe. */
303         portman_write_command(pm, cmdout);
304 
305         while ((portman_read_status(pm) & ESTB) == ESTB)
306                 cpu_relax();    /* Wait for strobe echo. */
307 
308         /* After the address lines settle, check multiplexed RxAvail signal.
309          * If data is available, read it.
310          */
311         if ((portman_read_status(pm) & RXAVAIL) == 0)
312                 return -1;      /* No data. */
313 
314         /* Set the Strobe signal to enable the Rx clocking circuitry. */
315         portman_write_command(pm, cmdout | STROBE);     /* Write address+IE+Strobe. */
316 
317         while ((portman_read_status(pm) & ESTB) == 0)
318                 cpu_relax(); /* Wait for strobe echo. */
319 
320         /* The first data bit (msb) is already sitting on the input line. */
321         midi_data = (portman_read_status(pm) & 128);
322         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
323 
324         /* Data bit 6. */
325         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
326         midi_data |= (portman_read_status(pm) >> 1) & 64;
327         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
328 
329         /* Data bit 5. */
330         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
331         midi_data |= (portman_read_status(pm) >> 2) & 32;
332         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
333 
334         /* Data bit 4. */
335         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
336         midi_data |= (portman_read_status(pm) >> 3) & 16;
337         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
338 
339         /* Data bit 3. */
340         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
341         midi_data |= (portman_read_status(pm) >> 4) & 8;
342         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
343 
344         /* Data bit 2. */
345         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
346         midi_data |= (portman_read_status(pm) >> 5) & 4;
347         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
348 
349         /* Data bit 1. */
350         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
351         midi_data |= (portman_read_status(pm) >> 6) & 2;
352         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
353 
354         /* Data bit 0. */
355         portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
356         midi_data |= (portman_read_status(pm) >> 7) & 1;
357         portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
358         portman_write_data(pm, 0);      /* Return data clock low. */
359 
360 
361         /* De-assert Strobe and return data. */
362         portman_write_command(pm, cmdout);      /* Output saved address+IE. */
363 
364         /* Wait for strobe echo. */
365         while ((portman_read_status(pm) & ESTB) == ESTB)
366                 cpu_relax();
367 
368         return (midi_data & 255);       /* Shift back and return value. */
369 }
370 
371 /*
372  *  Checks if any input data on the given channel is available
373  *  Checks RxAvail 
374  */
375 static int portman_data_avail(struct portman *pm, int channel)
376 {
377         int command = INT_EN;
378         switch (channel) {
379         case 0:
380                 command |= RXDATA0;
381                 break;
382         case 1:
383                 command |= RXDATA1;
384                 break;
385         }
386         /* Write hardware (assumme STROBE=0) */
387         portman_write_command(pm, command);
388         /* Check multiplexed RxAvail signal */
389         if ((portman_read_status(pm) & RXAVAIL) == RXAVAIL)
390                 return 1;       /* Data available */
391 
392         /* No Data available */
393         return 0;
394 }
395 
396 
397 /*
398  *  Flushes any input
399  */
400 static void portman_flush_input(struct portman *pm, unsigned char port)
401 {
402         /* Local variable for counting things */
403         unsigned int i = 0;
404         unsigned char command = 0;
405 
406         switch (port) {
407         case 0:
408                 command = RXDATA0;
409                 break;
410         case 1:
411                 command = RXDATA1;
412                 break;
413         default:
414                 snd_printk(KERN_WARNING
415                            "portman_flush_input() Won't flush port %i\n",
416                            port);
417                 return;
418         }
419 
420         /* Set address for specified channel in port and allow to settle. */
421         portman_write_command(pm, command);
422 
423         /* Assert the Strobe and wait for echo back. */
424         portman_write_command(pm, command | STROBE);
425 
426         /* Wait for ESTB */
427         while ((portman_read_status(pm) & ESTB) == 0)
428                 cpu_relax();
429 
430         /* Output clock cycles to the Rx circuitry. */
431         portman_write_data(pm, 0);
432 
433         /* Flush 250 bits... */
434         for (i = 0; i < 250; i++) {
435                 portman_write_data(pm, 1);
436                 portman_write_data(pm, 0);
437         }
438 
439         /* Deassert the Strobe signal of the port and wait for it to settle. */
440         portman_write_command(pm, command | INT_EN);
441 
442         /* Wait for settling */
443         while ((portman_read_status(pm) & ESTB) == ESTB)
444                 cpu_relax();
445 }
446 
447 static int portman_probe(struct parport *p)
448 {
449         /* Initialize the parallel port data register.  Will set Rx clocks
450          * low in case we happen to be addressing the Rx ports at this time.
451          */
452         /* 1 */
453         parport_write_data(p, 0);
454 
455         /* Initialize the parallel port command register, thus initializing
456          * hardware handshake lines to midi box:
457          *
458          *                                  Strobe = 0
459          *                                  Interrupt Enable = 0            
460          */
461         /* 2 */
462         parport_write_control(p, 0);
463 
464         /* Check if Portman PC/P 2x4 is out there. */
465         /* 3 */
466         parport_write_control(p, RXDATA0);      /* Write Strobe=0 to command reg. */
467 
468         /* Check for ESTB to be clear */
469         /* 4 */
470         if ((parport_read_status(p) & ESTB) == ESTB)
471                 return 1;       /* CODE 1 - Strobe Failure. */
472 
473         /* Set for RXDATA0 where no damage will be done. */
474         /* 5 */
475         parport_write_control(p, RXDATA0 + STROBE);     /* Write Strobe=1 to command reg. */
476 
477         /* 6 */
478         if ((parport_read_status(p) & ESTB) != ESTB)
479                 return 1;       /* CODE 1 - Strobe Failure. */
480 
481         /* 7 */
482         parport_write_control(p, 0);    /* Reset Strobe=0. */
483 
484         /* Check if Tx circuitry is functioning properly.  If initialized 
485          * unit TxEmpty is false, send out char and see if if goes true.
486          */
487         /* 8 */
488         parport_write_control(p, TXDATA0);      /* Tx channel 0, strobe off. */
489 
490         /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
491          * Status Register), then go write data.  Else go back and wait.
492          */
493         /* 9 */
494         if ((parport_read_status(p) & TXEMPTY) == 0)
495                 return 2;
496 
497         /* Return OK status. */
498         return 0;
499 }
500 
501 static int portman_device_init(struct portman *pm)
502 {
503         portman_flush_input(pm, 0);
504         portman_flush_input(pm, 1);
505 
506         return 0;
507 }
508 
509 /*********************************************************************
510  * Rawmidi
511  *********************************************************************/
512 static int snd_portman_midi_open(struct snd_rawmidi_substream *substream)
513 {
514         return 0;
515 }
516 
517 static int snd_portman_midi_close(struct snd_rawmidi_substream *substream)
518 {
519         return 0;
520 }
521 
522 static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream,
523                                            int up)
524 {
525         struct portman *pm = substream->rmidi->private_data;
526         unsigned long flags;
527 
528         spin_lock_irqsave(&pm->reg_lock, flags);
529         if (up)
530                 pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED;
531         else
532                 pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED;
533         spin_unlock_irqrestore(&pm->reg_lock, flags);
534 }
535 
536 static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream,
537                                             int up)
538 {
539         struct portman *pm = substream->rmidi->private_data;
540         unsigned long flags;
541         unsigned char byte;
542 
543         spin_lock_irqsave(&pm->reg_lock, flags);
544         if (up) {
545                 while ((snd_rawmidi_transmit(substream, &byte, 1) == 1))
546                         portman_write_midi(pm, substream->number, byte);
547         }
548         spin_unlock_irqrestore(&pm->reg_lock, flags);
549 }
550 
551 static struct snd_rawmidi_ops snd_portman_midi_output = {
552         .open =         snd_portman_midi_open,
553         .close =        snd_portman_midi_close,
554         .trigger =      snd_portman_midi_output_trigger,
555 };
556 
557 static struct snd_rawmidi_ops snd_portman_midi_input = {
558         .open =         snd_portman_midi_open,
559         .close =        snd_portman_midi_close,
560         .trigger =      snd_portman_midi_input_trigger,
561 };
562 
563 /* Create and initialize the rawmidi component */
564 static int snd_portman_rawmidi_create(struct snd_card *card)
565 {
566         struct portman *pm = card->private_data;
567         struct snd_rawmidi *rmidi;
568         struct snd_rawmidi_substream *substream;
569         int err;
570         
571         err = snd_rawmidi_new(card, CARD_NAME, 0, 
572                               PORTMAN_NUM_OUTPUT_PORTS, 
573                               PORTMAN_NUM_INPUT_PORTS, 
574                               &rmidi);
575         if (err < 0) 
576                 return err;
577 
578         rmidi->private_data = pm;
579         strcpy(rmidi->name, CARD_NAME);
580         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
581                             SNDRV_RAWMIDI_INFO_INPUT |
582                             SNDRV_RAWMIDI_INFO_DUPLEX;
583 
584         pm->rmidi = rmidi;
585 
586         /* register rawmidi ops */
587         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 
588                             &snd_portman_midi_output);
589         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 
590                             &snd_portman_midi_input);
591 
592         /* name substreams */
593         /* output */
594         list_for_each_entry(substream,
595                             &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
596                             list) {
597                 sprintf(substream->name,
598                         "Portman2x4 %d", substream->number+1);
599         }
600         /* input */
601         list_for_each_entry(substream,
602                             &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
603                             list) {
604                 pm->midi_input[substream->number] = substream;
605                 sprintf(substream->name,
606                         "Portman2x4 %d", substream->number+1);
607         }
608 
609         return err;
610 }
611 
612 /*********************************************************************
613  * parport stuff
614  *********************************************************************/
615 static void snd_portman_interrupt(void *userdata)
616 {
617         unsigned char midivalue = 0;
618         struct portman *pm = ((struct snd_card*)userdata)->private_data;
619 
620         spin_lock(&pm->reg_lock);
621 
622         /* While any input data is waiting */
623         while ((portman_read_status(pm) & INT_REQ) == INT_REQ) {
624                 /* If data available on channel 0, 
625                    read it and stuff it into the queue. */
626                 if (portman_data_avail(pm, 0)) {
627                         /* Read Midi */
628                         midivalue = portman_read_midi(pm, 0);
629                         /* put midi into queue... */
630                         if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
631                                 snd_rawmidi_receive(pm->midi_input[0],
632                                                     &midivalue, 1);
633 
634                 }
635                 /* If data available on channel 1, 
636                    read it and stuff it into the queue. */
637                 if (portman_data_avail(pm, 1)) {
638                         /* Read Midi */
639                         midivalue = portman_read_midi(pm, 1);
640                         /* put midi into queue... */
641                         if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
642                                 snd_rawmidi_receive(pm->midi_input[1],
643                                                     &midivalue, 1);
644                 }
645 
646         }
647 
648         spin_unlock(&pm->reg_lock);
649 }
650 
651 static int snd_portman_probe_port(struct parport *p)
652 {
653         struct pardevice *pardev;
654         int res;
655 
656         pardev = parport_register_device(p, DRIVER_NAME,
657                                          NULL, NULL, NULL,
658                                          0, NULL);
659         if (!pardev)
660                 return -EIO;
661         
662         if (parport_claim(pardev)) {
663                 parport_unregister_device(pardev);
664                 return -EIO;
665         }
666 
667         res = portman_probe(p);
668 
669         parport_release(pardev);
670         parport_unregister_device(pardev);
671 
672         return res ? -EIO : 0;
673 }
674 
675 static void snd_portman_attach(struct parport *p)
676 {
677         struct platform_device *device;
678 
679         device = platform_device_alloc(PLATFORM_DRIVER, device_count);
680         if (!device)
681                 return;
682 
683         /* Temporary assignment to forward the parport */
684         platform_set_drvdata(device, p);
685 
686         if (platform_device_add(device) < 0) {
687                 platform_device_put(device);
688                 return;
689         }
690 
691         /* Since we dont get the return value of probe
692          * We need to check if device probing succeeded or not */
693         if (!platform_get_drvdata(device)) {
694                 platform_device_unregister(device);
695                 return;
696         }
697 
698         /* register device in global table */
699         platform_devices[device_count] = device;
700         device_count++;
701 }
702 
703 static void snd_portman_detach(struct parport *p)
704 {
705         /* nothing to do here */
706 }
707 
708 static struct parport_driver portman_parport_driver = {
709         .name   = "portman2x4",
710         .attach = snd_portman_attach,
711         .detach = snd_portman_detach
712 };
713 
714 /*********************************************************************
715  * platform stuff
716  *********************************************************************/
717 static void snd_portman_card_private_free(struct snd_card *card)
718 {
719         struct portman *pm = card->private_data;
720         struct pardevice *pardev = pm->pardev;
721 
722         if (pardev) {
723                 if (pm->pardev_claimed)
724                         parport_release(pardev);
725                 parport_unregister_device(pardev);
726         }
727 
728         portman_free(pm);
729 }
730 
731 static int snd_portman_probe(struct platform_device *pdev)
732 {
733         struct pardevice *pardev;
734         struct parport *p;
735         int dev = pdev->id;
736         struct snd_card *card = NULL;
737         struct portman *pm = NULL;
738         int err;
739 
740         p = platform_get_drvdata(pdev);
741         platform_set_drvdata(pdev, NULL);
742 
743         if (dev >= SNDRV_CARDS)
744                 return -ENODEV;
745         if (!enable[dev]) 
746                 return -ENOENT;
747 
748         if ((err = snd_portman_probe_port(p)) < 0)
749                 return err;
750 
751         err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
752                            0, &card);
753         if (err < 0) {
754                 snd_printd("Cannot create card\n");
755                 return err;
756         }
757         strcpy(card->driver, DRIVER_NAME);
758         strcpy(card->shortname, CARD_NAME);
759         sprintf(card->longname,  "%s at 0x%lx, irq %i", 
760                 card->shortname, p->base, p->irq);
761 
762         pardev = parport_register_device(p,                     /* port */
763                                          DRIVER_NAME,           /* name */
764                                          NULL,                  /* preempt */
765                                          NULL,                  /* wakeup */
766                                          snd_portman_interrupt, /* ISR */
767                                          PARPORT_DEV_EXCL,      /* flags */
768                                          (void *)card);         /* private */
769         if (pardev == NULL) {
770                 snd_printd("Cannot register pardevice\n");
771                 err = -EIO;
772                 goto __err;
773         }
774 
775         if ((err = portman_create(card, pardev, &pm)) < 0) {
776                 snd_printd("Cannot create main component\n");
777                 parport_unregister_device(pardev);
778                 goto __err;
779         }
780         card->private_data = pm;
781         card->private_free = snd_portman_card_private_free;
782         
783         if ((err = snd_portman_rawmidi_create(card)) < 0) {
784                 snd_printd("Creating Rawmidi component failed\n");
785                 goto __err;
786         }
787 
788         /* claim parport */
789         if (parport_claim(pardev)) {
790                 snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
791                 err = -EIO;
792                 goto __err;
793         }
794         pm->pardev_claimed = 1;
795 
796         /* init device */
797         if ((err = portman_device_init(pm)) < 0)
798                 goto __err;
799 
800         platform_set_drvdata(pdev, card);
801 
802         /* At this point card will be usable */
803         if ((err = snd_card_register(card)) < 0) {
804                 snd_printd("Cannot register card\n");
805                 goto __err;
806         }
807 
808         snd_printk(KERN_INFO "Portman 2x4 on 0x%lx\n", p->base);
809         return 0;
810 
811 __err:
812         snd_card_free(card);
813         return err;
814 }
815 
816 static int snd_portman_remove(struct platform_device *pdev)
817 {
818         struct snd_card *card = platform_get_drvdata(pdev);
819 
820         if (card)
821                 snd_card_free(card);
822 
823         return 0;
824 }
825 
826 
827 static struct platform_driver snd_portman_driver = {
828         .probe  = snd_portman_probe,
829         .remove = snd_portman_remove,
830         .driver = {
831                 .name = PLATFORM_DRIVER,
832                 .owner  = THIS_MODULE,
833         }
834 };
835 
836 /*********************************************************************
837  * module init stuff
838  *********************************************************************/
839 static void snd_portman_unregister_all(void)
840 {
841         int i;
842 
843         for (i = 0; i < SNDRV_CARDS; ++i) {
844                 if (platform_devices[i]) {
845                         platform_device_unregister(platform_devices[i]);
846                         platform_devices[i] = NULL;
847                 }
848         }               
849         platform_driver_unregister(&snd_portman_driver);
850         parport_unregister_driver(&portman_parport_driver);
851 }
852 
853 static int __init snd_portman_module_init(void)
854 {
855         int err;
856 
857         if ((err = platform_driver_register(&snd_portman_driver)) < 0)
858                 return err;
859 
860         if (parport_register_driver(&portman_parport_driver) != 0) {
861                 platform_driver_unregister(&snd_portman_driver);
862                 return -EIO;
863         }
864 
865         if (device_count == 0) {
866                 snd_portman_unregister_all();
867                 return -ENODEV;
868         }
869 
870         return 0;
871 }
872 
873 static void __exit snd_portman_module_exit(void)
874 {
875         snd_portman_unregister_all();
876 }
877 
878 module_init(snd_portman_module_init);
879 module_exit(snd_portman_module_exit);
880 

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