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Linux/sound/drivers/mts64.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*     
  3  *   ALSA Driver for Ego Systems Inc. (ESI) Miditerminal 4140
  4  *   Copyright (c) 2006 by Matthias K├Ânig <mk@phasorlab.de>
  5  */
  6 
  7 #include <linux/init.h>
  8 #include <linux/platform_device.h>
  9 #include <linux/parport.h>
 10 #include <linux/spinlock.h>
 11 #include <linux/module.h>
 12 #include <linux/delay.h>
 13 #include <linux/slab.h>
 14 #include <sound/core.h>
 15 #include <sound/initval.h>
 16 #include <sound/rawmidi.h>
 17 #include <sound/control.h>
 18 
 19 #define CARD_NAME "Miditerminal 4140"
 20 #define DRIVER_NAME "MTS64"
 21 #define PLATFORM_DRIVER "snd_mts64"
 22 
 23 static int index[SNDRV_CARDS]  = SNDRV_DEFAULT_IDX;
 24 static char *id[SNDRV_CARDS]   = SNDRV_DEFAULT_STR;
 25 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 26 
 27 static struct platform_device *platform_devices[SNDRV_CARDS]; 
 28 static int device_count;
 29 
 30 module_param_array(index, int, NULL, 0444);
 31 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
 32 module_param_array(id, charp, NULL, 0444);
 33 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
 34 module_param_array(enable, bool, NULL, 0444);
 35 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
 36 
 37 MODULE_AUTHOR("Matthias Koenig <mk@phasorlab.de>");
 38 MODULE_DESCRIPTION("ESI Miditerminal 4140");
 39 MODULE_LICENSE("GPL");
 40 MODULE_SUPPORTED_DEVICE("{{ESI,Miditerminal 4140}}");
 41 
 42 /*********************************************************************
 43  * Chip specific
 44  *********************************************************************/
 45 #define MTS64_NUM_INPUT_PORTS 5
 46 #define MTS64_NUM_OUTPUT_PORTS 4
 47 #define MTS64_SMPTE_SUBSTREAM 4
 48 
 49 struct mts64 {
 50         spinlock_t lock;
 51         struct snd_card *card;
 52         struct snd_rawmidi *rmidi;
 53         struct pardevice *pardev;
 54         int open_count;
 55         int current_midi_output_port;
 56         int current_midi_input_port;
 57         u8 mode[MTS64_NUM_INPUT_PORTS];
 58         struct snd_rawmidi_substream *midi_input_substream[MTS64_NUM_INPUT_PORTS];
 59         int smpte_switch;
 60         u8 time[4]; /* [0]=hh, [1]=mm, [2]=ss, [3]=ff */
 61         u8 fps;
 62 };
 63 
 64 static int snd_mts64_free(struct mts64 *mts)
 65 {
 66         kfree(mts);
 67         return 0;
 68 }
 69 
 70 static int snd_mts64_create(struct snd_card *card,
 71                             struct pardevice *pardev,
 72                             struct mts64 **rchip)
 73 {
 74         struct mts64 *mts;
 75 
 76         *rchip = NULL;
 77 
 78         mts = kzalloc(sizeof(struct mts64), GFP_KERNEL);
 79         if (mts == NULL) 
 80                 return -ENOMEM;
 81 
 82         /* Init chip specific data */
 83         spin_lock_init(&mts->lock);
 84         mts->card = card;
 85         mts->pardev = pardev;
 86         mts->current_midi_output_port = -1;
 87         mts->current_midi_input_port = -1;
 88 
 89         *rchip = mts;
 90 
 91         return 0;
 92 }
 93 
 94 /*********************************************************************
 95  * HW register related constants
 96  *********************************************************************/
 97 
 98 /* Status Bits */
 99 #define MTS64_STAT_BSY             0x80
100 #define MTS64_STAT_BIT_SET         0x20  /* readout process, bit is set */
101 #define MTS64_STAT_PORT            0x10  /* read byte is a port number */
102 
103 /* Control Bits */
104 #define MTS64_CTL_READOUT          0x08  /* enable readout */
105 #define MTS64_CTL_WRITE_CMD        0x06  
106 #define MTS64_CTL_WRITE_DATA       0x02  
107 #define MTS64_CTL_STROBE           0x01  
108 
109 /* Command */
110 #define MTS64_CMD_RESET            0xfe
111 #define MTS64_CMD_PROBE            0x8f  /* Used in probing procedure */
112 #define MTS64_CMD_SMPTE_SET_TIME   0xe8
113 #define MTS64_CMD_SMPTE_SET_FPS    0xee
114 #define MTS64_CMD_SMPTE_STOP       0xef
115 #define MTS64_CMD_SMPTE_FPS_24     0xe3
116 #define MTS64_CMD_SMPTE_FPS_25     0xe2
117 #define MTS64_CMD_SMPTE_FPS_2997   0xe4 
118 #define MTS64_CMD_SMPTE_FPS_30D    0xe1
119 #define MTS64_CMD_SMPTE_FPS_30     0xe0
120 #define MTS64_CMD_COM_OPEN         0xf8  /* setting the communication mode */
121 #define MTS64_CMD_COM_CLOSE1       0xff  /* clearing communication mode */
122 #define MTS64_CMD_COM_CLOSE2       0xf5
123 
124 /*********************************************************************
125  * Hardware specific functions
126  *********************************************************************/
127 static void mts64_enable_readout(struct parport *p);
128 static void mts64_disable_readout(struct parport *p);
129 static int mts64_device_ready(struct parport *p);
130 static int mts64_device_init(struct parport *p);
131 static int mts64_device_open(struct mts64 *mts);
132 static int mts64_device_close(struct mts64 *mts);
133 static u8 mts64_map_midi_input(u8 c);
134 static int mts64_probe(struct parport *p);
135 static u16 mts64_read(struct parport *p);
136 static u8 mts64_read_char(struct parport *p);
137 static void mts64_smpte_start(struct parport *p,
138                               u8 hours, u8 minutes,
139                               u8 seconds, u8 frames,
140                               u8 idx);
141 static void mts64_smpte_stop(struct parport *p);
142 static void mts64_write_command(struct parport *p, u8 c);
143 static void mts64_write_data(struct parport *p, u8 c);
144 static void mts64_write_midi(struct mts64 *mts, u8 c, int midiport);
145 
146 
147 /*  Enables the readout procedure
148  *
149  *  Before we can read a midi byte from the device, we have to set
150  *  bit 3 of control port.
151  */
152 static void mts64_enable_readout(struct parport *p)
153 {
154         u8 c;
155 
156         c = parport_read_control(p);
157         c |= MTS64_CTL_READOUT;
158         parport_write_control(p, c); 
159 }
160 
161 /*  Disables readout 
162  *
163  *  Readout is disabled by clearing bit 3 of control
164  */
165 static void mts64_disable_readout(struct parport *p)
166 {
167         u8 c;
168 
169         c = parport_read_control(p);
170         c &= ~MTS64_CTL_READOUT;
171         parport_write_control(p, c);
172 }
173 
174 /*  waits for device ready
175  *
176  *  Checks if BUSY (Bit 7 of status) is clear
177  *  1 device ready
178  *  0 failure
179  */
180 static int mts64_device_ready(struct parport *p)
181 {
182         int i;
183         u8 c;
184 
185         for (i = 0; i < 0xffff; ++i) {
186                 c = parport_read_status(p);
187                 c &= MTS64_STAT_BSY;
188                 if (c != 0) 
189                         return 1;
190         } 
191 
192         return 0;
193 }
194 
195 /*  Init device (LED blinking startup magic)
196  *
197  *  Returns:
198  *  0 init ok
199  *  -EIO failure
200  */
201 static int mts64_device_init(struct parport *p)
202 {
203         int i;
204 
205         mts64_write_command(p, MTS64_CMD_RESET);
206 
207         for (i = 0; i < 64; ++i) {
208                 msleep(100);
209 
210                 if (mts64_probe(p) == 0) {
211                         /* success */
212                         mts64_disable_readout(p);
213                         return 0;
214                 }
215         }
216         mts64_disable_readout(p);
217 
218         return -EIO;
219 }
220 
221 /* 
222  *  Opens the device (set communication mode)
223  */
224 static int mts64_device_open(struct mts64 *mts)
225 {
226         int i;
227         struct parport *p = mts->pardev->port;
228 
229         for (i = 0; i < 5; ++i)
230                 mts64_write_command(p, MTS64_CMD_COM_OPEN);
231 
232         return 0;
233 }
234 
235 /*  
236  *  Close device (clear communication mode)
237  */
238 static int mts64_device_close(struct mts64 *mts)
239 {
240         int i;
241         struct parport *p = mts->pardev->port;
242 
243         for (i = 0; i < 5; ++i) {
244                 mts64_write_command(p, MTS64_CMD_COM_CLOSE1);
245                 mts64_write_command(p, MTS64_CMD_COM_CLOSE2);
246         }
247 
248         return 0;
249 }
250 
251 /*  map hardware port to substream number
252  * 
253  *  When reading a byte from the device, the device tells us
254  *  on what port the byte is. This HW port has to be mapped to
255  *  the midiport (substream number).
256  *  substream 0-3 are Midiports 1-4
257  *  substream 4 is SMPTE Timecode
258  *  The mapping is done by the table:
259  *  HW | 0 | 1 | 2 | 3 | 4 
260  *  SW | 0 | 1 | 4 | 2 | 3
261  */
262 static u8 mts64_map_midi_input(u8 c)
263 {
264         static u8 map[] = { 0, 1, 4, 2, 3 };
265 
266         return map[c];
267 }
268 
269 
270 /*  Probe parport for device
271  *
272  *  Do we have a Miditerminal 4140 on parport? 
273  *  Returns:
274  *  0       device found
275  *  -ENODEV no device
276  */
277 static int mts64_probe(struct parport *p)
278 {
279         u8 c;
280 
281         mts64_smpte_stop(p);
282         mts64_write_command(p, MTS64_CMD_PROBE);
283 
284         msleep(50);
285         
286         c = mts64_read(p);
287 
288         c &= 0x00ff;
289         if (c != MTS64_CMD_PROBE) 
290                 return -ENODEV;
291         else 
292                 return 0;
293 
294 }
295 
296 /*  Read byte incl. status from device
297  *
298  *  Returns:
299  *  data in lower 8 bits and status in upper 8 bits
300  */
301 static u16 mts64_read(struct parport *p)
302 {
303         u8 data, status;
304 
305         mts64_device_ready(p);
306         mts64_enable_readout(p);
307         status = parport_read_status(p);
308         data = mts64_read_char(p);
309         mts64_disable_readout(p);
310 
311         return (status << 8) | data;
312 }
313 
314 /*  Read a byte from device
315  *
316  *  Note, that readout mode has to be enabled.
317  *  readout procedure is as follows: 
318  *  - Write number of the Bit to read to DATA
319  *  - Read STATUS
320  *  - Bit 5 of STATUS indicates if Bit is set
321  *
322  *  Returns:
323  *  Byte read from device
324  */
325 static u8 mts64_read_char(struct parport *p)
326 {
327         u8 c = 0;
328         u8 status;
329         u8 i;
330 
331         for (i = 0; i < 8; ++i) {
332                 parport_write_data(p, i);
333                 c >>= 1;
334                 status = parport_read_status(p);
335                 if (status & MTS64_STAT_BIT_SET) 
336                         c |= 0x80;
337         }
338         
339         return c;
340 }
341 
342 /*  Starts SMPTE Timecode generation
343  *
344  *  The device creates SMPTE Timecode by hardware.
345  *  0 24 fps
346  *  1 25 fps
347  *  2 29.97 fps
348  *  3 30 fps (Drop-frame)
349  *  4 30 fps
350  */
351 static void mts64_smpte_start(struct parport *p,
352                               u8 hours, u8 minutes,
353                               u8 seconds, u8 frames,
354                               u8 idx)
355 {
356         static u8 fps[5] = { MTS64_CMD_SMPTE_FPS_24, 
357                              MTS64_CMD_SMPTE_FPS_25,
358                              MTS64_CMD_SMPTE_FPS_2997, 
359                              MTS64_CMD_SMPTE_FPS_30D,
360                              MTS64_CMD_SMPTE_FPS_30    };
361 
362         mts64_write_command(p, MTS64_CMD_SMPTE_SET_TIME);
363         mts64_write_command(p, frames);
364         mts64_write_command(p, seconds);
365         mts64_write_command(p, minutes);
366         mts64_write_command(p, hours);
367 
368         mts64_write_command(p, MTS64_CMD_SMPTE_SET_FPS);
369         mts64_write_command(p, fps[idx]);
370 }
371 
372 /*  Stops SMPTE Timecode generation
373  */
374 static void mts64_smpte_stop(struct parport *p)
375 {
376         mts64_write_command(p, MTS64_CMD_SMPTE_STOP);
377 }
378 
379 /*  Write a command byte to device
380  */
381 static void mts64_write_command(struct parport *p, u8 c)
382 {
383         mts64_device_ready(p);
384 
385         parport_write_data(p, c);
386 
387         parport_write_control(p, MTS64_CTL_WRITE_CMD);
388         parport_write_control(p, MTS64_CTL_WRITE_CMD | MTS64_CTL_STROBE);
389         parport_write_control(p, MTS64_CTL_WRITE_CMD);
390 }
391 
392 /*  Write a data byte to device 
393  */
394 static void mts64_write_data(struct parport *p, u8 c)
395 {
396         mts64_device_ready(p);
397 
398         parport_write_data(p, c);
399 
400         parport_write_control(p, MTS64_CTL_WRITE_DATA);
401         parport_write_control(p, MTS64_CTL_WRITE_DATA | MTS64_CTL_STROBE);
402         parport_write_control(p, MTS64_CTL_WRITE_DATA);
403 }
404 
405 /*  Write a MIDI byte to midiport
406  *
407  *  midiport ranges from 0-3 and maps to Ports 1-4
408  *  assumptions: communication mode is on
409  */
410 static void mts64_write_midi(struct mts64 *mts, u8 c,
411                              int midiport)
412 {
413         struct parport *p = mts->pardev->port;
414 
415         /* check current midiport */
416         if (mts->current_midi_output_port != midiport)
417                 mts64_write_command(p, midiport);
418 
419         /* write midi byte */
420         mts64_write_data(p, c);
421 }
422 
423 /*********************************************************************
424  * Control elements
425  *********************************************************************/
426 
427 /* SMPTE Switch */
428 #define snd_mts64_ctl_smpte_switch_info         snd_ctl_boolean_mono_info
429 
430 static int snd_mts64_ctl_smpte_switch_get(struct snd_kcontrol* kctl,
431                                           struct snd_ctl_elem_value *uctl)
432 {
433         struct mts64 *mts = snd_kcontrol_chip(kctl);
434 
435         spin_lock_irq(&mts->lock);
436         uctl->value.integer.value[0] = mts->smpte_switch;
437         spin_unlock_irq(&mts->lock);
438 
439         return 0;
440 }
441 
442 /* smpte_switch is not accessed from IRQ handler, so we just need
443    to protect the HW access */
444 static int snd_mts64_ctl_smpte_switch_put(struct snd_kcontrol* kctl,
445                                           struct snd_ctl_elem_value *uctl)
446 {
447         struct mts64 *mts = snd_kcontrol_chip(kctl);
448         int changed = 0;
449         int val = !!uctl->value.integer.value[0];
450 
451         spin_lock_irq(&mts->lock);
452         if (mts->smpte_switch == val)
453                 goto __out;
454 
455         changed = 1;
456         mts->smpte_switch = val;
457         if (mts->smpte_switch) {
458                 mts64_smpte_start(mts->pardev->port,
459                                   mts->time[0], mts->time[1],
460                                   mts->time[2], mts->time[3],
461                                   mts->fps);
462         } else {
463                 mts64_smpte_stop(mts->pardev->port);
464         }
465 __out:
466         spin_unlock_irq(&mts->lock);
467         return changed;
468 }
469 
470 static struct snd_kcontrol_new mts64_ctl_smpte_switch = {
471         .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
472         .name  = "SMPTE Playback Switch",
473         .index = 0,
474         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
475         .private_value = 0,
476         .info = snd_mts64_ctl_smpte_switch_info,
477         .get  = snd_mts64_ctl_smpte_switch_get,
478         .put  = snd_mts64_ctl_smpte_switch_put
479 };
480 
481 /* Time */
482 static int snd_mts64_ctl_smpte_time_h_info(struct snd_kcontrol *kctl,
483                                            struct snd_ctl_elem_info *uinfo)
484 {
485         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
486         uinfo->count = 1;
487         uinfo->value.integer.min = 0;
488         uinfo->value.integer.max = 23;
489         return 0;
490 }
491 
492 static int snd_mts64_ctl_smpte_time_f_info(struct snd_kcontrol *kctl,
493                                            struct snd_ctl_elem_info *uinfo)
494 {
495         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
496         uinfo->count = 1;
497         uinfo->value.integer.min = 0;
498         uinfo->value.integer.max = 99;
499         return 0;
500 }
501 
502 static int snd_mts64_ctl_smpte_time_info(struct snd_kcontrol *kctl,
503                                          struct snd_ctl_elem_info *uinfo)
504 {
505         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
506         uinfo->count = 1;
507         uinfo->value.integer.min = 0;
508         uinfo->value.integer.max = 59;
509         return 0;
510 }
511 
512 static int snd_mts64_ctl_smpte_time_get(struct snd_kcontrol *kctl,
513                                         struct snd_ctl_elem_value *uctl)
514 {
515         struct mts64 *mts = snd_kcontrol_chip(kctl);
516         int idx = kctl->private_value;
517 
518         spin_lock_irq(&mts->lock);
519         uctl->value.integer.value[0] = mts->time[idx];
520         spin_unlock_irq(&mts->lock);
521 
522         return 0;
523 }
524 
525 static int snd_mts64_ctl_smpte_time_put(struct snd_kcontrol *kctl,
526                                         struct snd_ctl_elem_value *uctl)
527 {
528         struct mts64 *mts = snd_kcontrol_chip(kctl);
529         int idx = kctl->private_value;
530         unsigned int time = uctl->value.integer.value[0] % 60;
531         int changed = 0;
532 
533         spin_lock_irq(&mts->lock);
534         if (mts->time[idx] != time) {
535                 changed = 1;
536                 mts->time[idx] = time;
537         }
538         spin_unlock_irq(&mts->lock);
539 
540         return changed;
541 }
542 
543 static struct snd_kcontrol_new mts64_ctl_smpte_time_hours = {
544         .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
545         .name  = "SMPTE Time Hours",
546         .index = 0,
547         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
548         .private_value = 0,
549         .info = snd_mts64_ctl_smpte_time_h_info,
550         .get  = snd_mts64_ctl_smpte_time_get,
551         .put  = snd_mts64_ctl_smpte_time_put
552 };
553 
554 static struct snd_kcontrol_new mts64_ctl_smpte_time_minutes = {
555         .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
556         .name  = "SMPTE Time Minutes",
557         .index = 0,
558         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
559         .private_value = 1,
560         .info = snd_mts64_ctl_smpte_time_info,
561         .get  = snd_mts64_ctl_smpte_time_get,
562         .put  = snd_mts64_ctl_smpte_time_put
563 };
564 
565 static struct snd_kcontrol_new mts64_ctl_smpte_time_seconds = {
566         .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
567         .name  = "SMPTE Time Seconds",
568         .index = 0,
569         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
570         .private_value = 2,
571         .info = snd_mts64_ctl_smpte_time_info,
572         .get  = snd_mts64_ctl_smpte_time_get,
573         .put  = snd_mts64_ctl_smpte_time_put
574 };
575 
576 static struct snd_kcontrol_new mts64_ctl_smpte_time_frames = {
577         .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
578         .name  = "SMPTE Time Frames",
579         .index = 0,
580         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
581         .private_value = 3,
582         .info = snd_mts64_ctl_smpte_time_f_info,
583         .get  = snd_mts64_ctl_smpte_time_get,
584         .put  = snd_mts64_ctl_smpte_time_put
585 };
586 
587 /* FPS */
588 static int snd_mts64_ctl_smpte_fps_info(struct snd_kcontrol *kctl,
589                                         struct snd_ctl_elem_info *uinfo)
590 {
591         static const char * const texts[5] = {
592                 "24", "25", "29.97", "30D", "30"
593         };
594 
595         return snd_ctl_enum_info(uinfo, 1, 5, texts);
596 }
597 
598 static int snd_mts64_ctl_smpte_fps_get(struct snd_kcontrol *kctl,
599                                        struct snd_ctl_elem_value *uctl)
600 {
601         struct mts64 *mts = snd_kcontrol_chip(kctl);
602 
603         spin_lock_irq(&mts->lock);
604         uctl->value.enumerated.item[0] = mts->fps;
605         spin_unlock_irq(&mts->lock);
606 
607         return 0;
608 }
609 
610 static int snd_mts64_ctl_smpte_fps_put(struct snd_kcontrol *kctl,
611                                        struct snd_ctl_elem_value *uctl)
612 {
613         struct mts64 *mts = snd_kcontrol_chip(kctl);
614         int changed = 0;
615 
616         if (uctl->value.enumerated.item[0] >= 5)
617                 return -EINVAL;
618         spin_lock_irq(&mts->lock);
619         if (mts->fps != uctl->value.enumerated.item[0]) {
620                 changed = 1;
621                 mts->fps = uctl->value.enumerated.item[0];
622         }
623         spin_unlock_irq(&mts->lock);
624 
625         return changed;
626 }
627 
628 static struct snd_kcontrol_new mts64_ctl_smpte_fps = {
629         .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
630         .name  = "SMPTE Fps",
631         .index = 0,
632         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
633         .private_value = 0,
634         .info  = snd_mts64_ctl_smpte_fps_info,
635         .get   = snd_mts64_ctl_smpte_fps_get,
636         .put   = snd_mts64_ctl_smpte_fps_put
637 };
638 
639 
640 static int snd_mts64_ctl_create(struct snd_card *card,
641                                 struct mts64 *mts)
642 {
643         int err, i;
644         static struct snd_kcontrol_new *control[] = {
645                 &mts64_ctl_smpte_switch,
646                 &mts64_ctl_smpte_time_hours,
647                 &mts64_ctl_smpte_time_minutes,
648                 &mts64_ctl_smpte_time_seconds,
649                 &mts64_ctl_smpte_time_frames,
650                 &mts64_ctl_smpte_fps,
651                 NULL  };
652 
653         for (i = 0; control[i]; ++i) {
654                 err = snd_ctl_add(card, snd_ctl_new1(control[i], mts));
655                 if (err < 0) {
656                         snd_printd("Cannot create control: %s\n", 
657                                    control[i]->name);
658                         return err;
659                 }
660         }
661 
662         return 0;
663 }
664 
665 /*********************************************************************
666  * Rawmidi
667  *********************************************************************/
668 #define MTS64_MODE_INPUT_TRIGGERED 0x01
669 
670 static int snd_mts64_rawmidi_open(struct snd_rawmidi_substream *substream)
671 {
672         struct mts64 *mts = substream->rmidi->private_data;
673 
674         if (mts->open_count == 0) {
675                 /* We don't need a spinlock here, because this is just called 
676                    if the device has not been opened before. 
677                    So there aren't any IRQs from the device */
678                 mts64_device_open(mts);
679 
680                 msleep(50);
681         }
682         ++(mts->open_count);
683 
684         return 0;
685 }
686 
687 static int snd_mts64_rawmidi_close(struct snd_rawmidi_substream *substream)
688 {
689         struct mts64 *mts = substream->rmidi->private_data;
690         unsigned long flags;
691 
692         --(mts->open_count);
693         if (mts->open_count == 0) {
694                 /* We need the spinlock_irqsave here because we can still
695                    have IRQs at this point */
696                 spin_lock_irqsave(&mts->lock, flags);
697                 mts64_device_close(mts);
698                 spin_unlock_irqrestore(&mts->lock, flags);
699 
700                 msleep(500);
701 
702         } else if (mts->open_count < 0)
703                 mts->open_count = 0;
704 
705         return 0;
706 }
707 
708 static void snd_mts64_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,
709                                              int up)
710 {
711         struct mts64 *mts = substream->rmidi->private_data;
712         u8 data;
713         unsigned long flags;
714 
715         spin_lock_irqsave(&mts->lock, flags);
716         while (snd_rawmidi_transmit_peek(substream, &data, 1) == 1) {
717                 mts64_write_midi(mts, data, substream->number+1);
718                 snd_rawmidi_transmit_ack(substream, 1);
719         }
720         spin_unlock_irqrestore(&mts->lock, flags);
721 }
722 
723 static void snd_mts64_rawmidi_input_trigger(struct snd_rawmidi_substream *substream,
724                                             int up)
725 {
726         struct mts64 *mts = substream->rmidi->private_data;
727         unsigned long flags;
728 
729         spin_lock_irqsave(&mts->lock, flags);
730         if (up)
731                 mts->mode[substream->number] |= MTS64_MODE_INPUT_TRIGGERED;
732         else
733                 mts->mode[substream->number] &= ~MTS64_MODE_INPUT_TRIGGERED;
734         
735         spin_unlock_irqrestore(&mts->lock, flags);
736 }
737 
738 static const struct snd_rawmidi_ops snd_mts64_rawmidi_output_ops = {
739         .open    = snd_mts64_rawmidi_open,
740         .close   = snd_mts64_rawmidi_close,
741         .trigger = snd_mts64_rawmidi_output_trigger
742 };
743 
744 static const struct snd_rawmidi_ops snd_mts64_rawmidi_input_ops = {
745         .open    = snd_mts64_rawmidi_open,
746         .close   = snd_mts64_rawmidi_close,
747         .trigger = snd_mts64_rawmidi_input_trigger
748 };
749 
750 /* Create and initialize the rawmidi component */
751 static int snd_mts64_rawmidi_create(struct snd_card *card)
752 {
753         struct mts64 *mts = card->private_data;
754         struct snd_rawmidi *rmidi;
755         struct snd_rawmidi_substream *substream;
756         struct list_head *list;
757         int err;
758         
759         err = snd_rawmidi_new(card, CARD_NAME, 0, 
760                               MTS64_NUM_OUTPUT_PORTS, 
761                               MTS64_NUM_INPUT_PORTS, 
762                               &rmidi);
763         if (err < 0) 
764                 return err;
765 
766         rmidi->private_data = mts;
767         strcpy(rmidi->name, CARD_NAME);
768         rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
769                             SNDRV_RAWMIDI_INFO_INPUT |
770                             SNDRV_RAWMIDI_INFO_DUPLEX;
771 
772         mts->rmidi = rmidi;
773 
774         /* register rawmidi ops */
775         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 
776                             &snd_mts64_rawmidi_output_ops);
777         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 
778                             &snd_mts64_rawmidi_input_ops);
779 
780         /* name substreams */
781         /* output */
782         list_for_each(list, 
783                       &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
784                 substream = list_entry(list, struct snd_rawmidi_substream, list);
785                 sprintf(substream->name,
786                         "Miditerminal %d", substream->number+1);
787         }
788         /* input */
789         list_for_each(list, 
790                       &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
791                 substream = list_entry(list, struct snd_rawmidi_substream, list);
792                 mts->midi_input_substream[substream->number] = substream;
793                 switch(substream->number) {
794                 case MTS64_SMPTE_SUBSTREAM:
795                         strcpy(substream->name, "Miditerminal SMPTE");
796                         break;
797                 default:
798                         sprintf(substream->name,
799                                 "Miditerminal %d", substream->number+1);
800                 }
801         }
802 
803         /* controls */
804         err = snd_mts64_ctl_create(card, mts);
805 
806         return err;
807 }
808 
809 /*********************************************************************
810  * parport stuff
811  *********************************************************************/
812 static void snd_mts64_interrupt(void *private)
813 {
814         struct mts64 *mts = ((struct snd_card*)private)->private_data;
815         u16 ret;
816         u8 status, data;
817         struct snd_rawmidi_substream *substream;
818 
819         spin_lock(&mts->lock);
820         ret = mts64_read(mts->pardev->port);
821         data = ret & 0x00ff;
822         status = ret >> 8;
823 
824         if (status & MTS64_STAT_PORT) {
825                 mts->current_midi_input_port = mts64_map_midi_input(data);
826         } else {
827                 if (mts->current_midi_input_port == -1) 
828                         goto __out;
829                 substream = mts->midi_input_substream[mts->current_midi_input_port];
830                 if (mts->mode[substream->number] & MTS64_MODE_INPUT_TRIGGERED)
831                         snd_rawmidi_receive(substream, &data, 1);
832         }
833 __out:
834         spin_unlock(&mts->lock);
835 }
836 
837 static void snd_mts64_attach(struct parport *p)
838 {
839         struct platform_device *device;
840 
841         device = platform_device_alloc(PLATFORM_DRIVER, device_count);
842         if (!device)
843                 return;
844 
845         /* Temporary assignment to forward the parport */
846         platform_set_drvdata(device, p);
847 
848         if (platform_device_add(device) < 0) {
849                 platform_device_put(device);
850                 return;
851         }
852 
853         /* Since we dont get the return value of probe
854          * We need to check if device probing succeeded or not */
855         if (!platform_get_drvdata(device)) {
856                 platform_device_unregister(device);
857                 return;
858         }
859 
860         /* register device in global table */
861         platform_devices[device_count] = device;
862         device_count++;
863 }
864 
865 static void snd_mts64_detach(struct parport *p)
866 {
867         /* nothing to do here */
868 }
869 
870 static int snd_mts64_dev_probe(struct pardevice *pardev)
871 {
872         if (strcmp(pardev->name, DRIVER_NAME))
873                 return -ENODEV;
874 
875         return 0;
876 }
877 
878 static struct parport_driver mts64_parport_driver = {
879         .name           = "mts64",
880         .probe          = snd_mts64_dev_probe,
881         .match_port     = snd_mts64_attach,
882         .detach         = snd_mts64_detach,
883         .devmodel       = true,
884 };
885 
886 /*********************************************************************
887  * platform stuff
888  *********************************************************************/
889 static void snd_mts64_card_private_free(struct snd_card *card)
890 {
891         struct mts64 *mts = card->private_data;
892         struct pardevice *pardev = mts->pardev;
893 
894         if (pardev) {
895                 parport_release(pardev);
896                 parport_unregister_device(pardev);
897         }
898 
899         snd_mts64_free(mts);
900 }
901 
902 static int snd_mts64_probe(struct platform_device *pdev)
903 {
904         struct pardevice *pardev;
905         struct parport *p;
906         int dev = pdev->id;
907         struct snd_card *card = NULL;
908         struct mts64 *mts = NULL;
909         int err;
910         struct pardev_cb mts64_cb = {
911                 .preempt = NULL,
912                 .wakeup = NULL,
913                 .irq_func = snd_mts64_interrupt,        /* ISR */
914                 .flags = PARPORT_DEV_EXCL,              /* flags */
915         };
916 
917         p = platform_get_drvdata(pdev);
918         platform_set_drvdata(pdev, NULL);
919 
920         if (dev >= SNDRV_CARDS)
921                 return -ENODEV;
922         if (!enable[dev]) 
923                 return -ENOENT;
924 
925         err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
926                            0, &card);
927         if (err < 0) {
928                 snd_printd("Cannot create card\n");
929                 return err;
930         }
931         strcpy(card->driver, DRIVER_NAME);
932         strcpy(card->shortname, "ESI " CARD_NAME);
933         sprintf(card->longname,  "%s at 0x%lx, irq %i", 
934                 card->shortname, p->base, p->irq);
935 
936         mts64_cb.private = card;                         /* private */
937         pardev = parport_register_dev_model(p,           /* port */
938                                             DRIVER_NAME, /* name */
939                                             &mts64_cb,   /* callbacks */
940                                             pdev->id);   /* device number */
941         if (!pardev) {
942                 snd_printd("Cannot register pardevice\n");
943                 err = -EIO;
944                 goto __err;
945         }
946 
947         /* claim parport */
948         if (parport_claim(pardev)) {
949                 snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
950                 err = -EIO;
951                 goto free_pardev;
952         }
953 
954         if ((err = snd_mts64_create(card, pardev, &mts)) < 0) {
955                 snd_printd("Cannot create main component\n");
956                 goto release_pardev;
957         }
958         card->private_data = mts;
959         card->private_free = snd_mts64_card_private_free;
960 
961         err = mts64_probe(p);
962         if (err) {
963                 err = -EIO;
964                 goto __err;
965         }
966         
967         if ((err = snd_mts64_rawmidi_create(card)) < 0) {
968                 snd_printd("Creating Rawmidi component failed\n");
969                 goto __err;
970         }
971 
972         /* init device */
973         if ((err = mts64_device_init(p)) < 0)
974                 goto __err;
975 
976         platform_set_drvdata(pdev, card);
977 
978         /* At this point card will be usable */
979         if ((err = snd_card_register(card)) < 0) {
980                 snd_printd("Cannot register card\n");
981                 goto __err;
982         }
983 
984         snd_printk(KERN_INFO "ESI Miditerminal 4140 on 0x%lx\n", p->base);
985         return 0;
986 
987 release_pardev:
988         parport_release(pardev);
989 free_pardev:
990         parport_unregister_device(pardev);
991 __err:
992         snd_card_free(card);
993         return err;
994 }
995 
996 static int snd_mts64_remove(struct platform_device *pdev)
997 {
998         struct snd_card *card = platform_get_drvdata(pdev);
999 
1000         if (card)
1001                 snd_card_free(card);
1002 
1003         return 0;
1004 }
1005 
1006 static struct platform_driver snd_mts64_driver = {
1007         .probe  = snd_mts64_probe,
1008         .remove = snd_mts64_remove,
1009         .driver = {
1010                 .name = PLATFORM_DRIVER,
1011         }
1012 };
1013 
1014 /*********************************************************************
1015  * module init stuff
1016  *********************************************************************/
1017 static void snd_mts64_unregister_all(void)
1018 {
1019         int i;
1020 
1021         for (i = 0; i < SNDRV_CARDS; ++i) {
1022                 if (platform_devices[i]) {
1023                         platform_device_unregister(platform_devices[i]);
1024                         platform_devices[i] = NULL;
1025                 }
1026         }               
1027         platform_driver_unregister(&snd_mts64_driver);
1028         parport_unregister_driver(&mts64_parport_driver);
1029 }
1030 
1031 static int __init snd_mts64_module_init(void)
1032 {
1033         int err;
1034 
1035         if ((err = platform_driver_register(&snd_mts64_driver)) < 0)
1036                 return err;
1037 
1038         if (parport_register_driver(&mts64_parport_driver) != 0) {
1039                 platform_driver_unregister(&snd_mts64_driver);
1040                 return -EIO;
1041         }
1042 
1043         if (device_count == 0) {
1044                 snd_mts64_unregister_all();
1045                 return -ENODEV;
1046         }
1047 
1048         return 0;
1049 }
1050 
1051 static void __exit snd_mts64_module_exit(void)
1052 {
1053         snd_mts64_unregister_all();
1054 }
1055 
1056 module_init(snd_mts64_module_init);
1057 module_exit(snd_mts64_module_exit);
1058 

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