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/soc/omap/ams-delta.c

  1 /*
  2  * ams-delta.c  --  SoC audio for Amstrad E3 (Delta) videophone
  3  *
  4  * Copyright (C) 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
  5  *
  6  * Initially based on sound/soc/omap/osk5912.x
  7  * Copyright (C) 2008 Mistral Solutions
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License
 11  * version 2 as published by the Free Software Foundation.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16  * General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 21  * 02110-1301 USA
 22  *
 23  */
 24 
 25 #include <linux/gpio.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/tty.h>
 28 #include <linux/module.h>
 29 
 30 #include <sound/soc.h>
 31 #include <sound/jack.h>
 32 
 33 #include <asm/mach-types.h>
 34 
 35 #include <mach/board-ams-delta.h>
 36 #include <linux/platform_data/asoc-ti-mcbsp.h>
 37 
 38 #include "omap-mcbsp.h"
 39 #include "../codecs/cx20442.h"
 40 
 41 /* Board specific DAPM widgets */
 42 static const struct snd_soc_dapm_widget ams_delta_dapm_widgets[] = {
 43         /* Handset */
 44         SND_SOC_DAPM_MIC("Mouthpiece", NULL),
 45         SND_SOC_DAPM_HP("Earpiece", NULL),
 46         /* Handsfree/Speakerphone */
 47         SND_SOC_DAPM_MIC("Microphone", NULL),
 48         SND_SOC_DAPM_SPK("Speaker", NULL),
 49 };
 50 
 51 /* How they are connected to codec pins */
 52 static const struct snd_soc_dapm_route ams_delta_audio_map[] = {
 53         {"TELIN", NULL, "Mouthpiece"},
 54         {"Earpiece", NULL, "TELOUT"},
 55 
 56         {"MIC", NULL, "Microphone"},
 57         {"Speaker", NULL, "SPKOUT"},
 58 };
 59 
 60 /*
 61  * Controls, functional after the modem line discipline is activated.
 62  */
 63 
 64 /* Virtual switch: audio input/output constellations */
 65 static const char *ams_delta_audio_mode[] =
 66         {"Mixed", "Handset", "Handsfree", "Speakerphone"};
 67 
 68 /* Selection <-> pin translation */
 69 #define AMS_DELTA_MOUTHPIECE    0
 70 #define AMS_DELTA_EARPIECE      1
 71 #define AMS_DELTA_MICROPHONE    2
 72 #define AMS_DELTA_SPEAKER       3
 73 #define AMS_DELTA_AGC           4
 74 
 75 #define AMS_DELTA_MIXED         ((1 << AMS_DELTA_EARPIECE) | \
 76                                                 (1 << AMS_DELTA_MICROPHONE))
 77 #define AMS_DELTA_HANDSET       ((1 << AMS_DELTA_MOUTHPIECE) | \
 78                                                 (1 << AMS_DELTA_EARPIECE))
 79 #define AMS_DELTA_HANDSFREE     ((1 << AMS_DELTA_MICROPHONE) | \
 80                                                 (1 << AMS_DELTA_SPEAKER))
 81 #define AMS_DELTA_SPEAKERPHONE  (AMS_DELTA_HANDSFREE | (1 << AMS_DELTA_AGC))
 82 
 83 static const unsigned short ams_delta_audio_mode_pins[] = {
 84         AMS_DELTA_MIXED,
 85         AMS_DELTA_HANDSET,
 86         AMS_DELTA_HANDSFREE,
 87         AMS_DELTA_SPEAKERPHONE,
 88 };
 89 
 90 static unsigned short ams_delta_audio_agc;
 91 
 92 /*
 93  * Used for passing a codec structure pointer
 94  * from the board initialization code to the tty line discipline.
 95  */
 96 static struct snd_soc_codec *cx20442_codec;
 97 
 98 static int ams_delta_set_audio_mode(struct snd_kcontrol *kcontrol,
 99                                         struct snd_ctl_elem_value *ucontrol)
100 {
101         struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
102         struct snd_soc_dapm_context *dapm = &card->dapm;
103         struct soc_enum *control = (struct soc_enum *)kcontrol->private_value;
104         unsigned short pins;
105         int pin, changed = 0;
106 
107         /* Refuse any mode changes if we are not able to control the codec. */
108         if (!cx20442_codec->hw_write)
109                 return -EUNATCH;
110 
111         if (ucontrol->value.enumerated.item[0] >= control->items)
112                 return -EINVAL;
113 
114         snd_soc_dapm_mutex_lock(dapm);
115 
116         /* Translate selection to bitmap */
117         pins = ams_delta_audio_mode_pins[ucontrol->value.enumerated.item[0]];
118 
119         /* Setup pins after corresponding bits if changed */
120         pin = !!(pins & (1 << AMS_DELTA_MOUTHPIECE));
121 
122         if (pin != snd_soc_dapm_get_pin_status(dapm, "Mouthpiece")) {
123                 changed = 1;
124                 if (pin)
125                         snd_soc_dapm_enable_pin_unlocked(dapm, "Mouthpiece");
126                 else
127                         snd_soc_dapm_disable_pin_unlocked(dapm, "Mouthpiece");
128         }
129         pin = !!(pins & (1 << AMS_DELTA_EARPIECE));
130         if (pin != snd_soc_dapm_get_pin_status(dapm, "Earpiece")) {
131                 changed = 1;
132                 if (pin)
133                         snd_soc_dapm_enable_pin_unlocked(dapm, "Earpiece");
134                 else
135                         snd_soc_dapm_disable_pin_unlocked(dapm, "Earpiece");
136         }
137         pin = !!(pins & (1 << AMS_DELTA_MICROPHONE));
138         if (pin != snd_soc_dapm_get_pin_status(dapm, "Microphone")) {
139                 changed = 1;
140                 if (pin)
141                         snd_soc_dapm_enable_pin_unlocked(dapm, "Microphone");
142                 else
143                         snd_soc_dapm_disable_pin_unlocked(dapm, "Microphone");
144         }
145         pin = !!(pins & (1 << AMS_DELTA_SPEAKER));
146         if (pin != snd_soc_dapm_get_pin_status(dapm, "Speaker")) {
147                 changed = 1;
148                 if (pin)
149                         snd_soc_dapm_enable_pin_unlocked(dapm, "Speaker");
150                 else
151                         snd_soc_dapm_disable_pin_unlocked(dapm, "Speaker");
152         }
153         pin = !!(pins & (1 << AMS_DELTA_AGC));
154         if (pin != ams_delta_audio_agc) {
155                 ams_delta_audio_agc = pin;
156                 changed = 1;
157                 if (pin)
158                         snd_soc_dapm_enable_pin_unlocked(dapm, "AGCIN");
159                 else
160                         snd_soc_dapm_disable_pin_unlocked(dapm, "AGCIN");
161         }
162 
163         if (changed)
164                 snd_soc_dapm_sync_unlocked(dapm);
165 
166         snd_soc_dapm_mutex_unlock(dapm);
167 
168         return changed;
169 }
170 
171 static int ams_delta_get_audio_mode(struct snd_kcontrol *kcontrol,
172                                         struct snd_ctl_elem_value *ucontrol)
173 {
174         struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
175         struct snd_soc_dapm_context *dapm = &card->dapm;
176         unsigned short pins, mode;
177 
178         pins = ((snd_soc_dapm_get_pin_status(dapm, "Mouthpiece") <<
179                                                         AMS_DELTA_MOUTHPIECE) |
180                         (snd_soc_dapm_get_pin_status(dapm, "Earpiece") <<
181                                                         AMS_DELTA_EARPIECE));
182         if (pins)
183                 pins |= (snd_soc_dapm_get_pin_status(dapm, "Microphone") <<
184                                                         AMS_DELTA_MICROPHONE);
185         else
186                 pins = ((snd_soc_dapm_get_pin_status(dapm, "Microphone") <<
187                                                         AMS_DELTA_MICROPHONE) |
188                         (snd_soc_dapm_get_pin_status(dapm, "Speaker") <<
189                                                         AMS_DELTA_SPEAKER) |
190                         (ams_delta_audio_agc << AMS_DELTA_AGC));
191 
192         for (mode = 0; mode < ARRAY_SIZE(ams_delta_audio_mode); mode++)
193                 if (pins == ams_delta_audio_mode_pins[mode])
194                         break;
195 
196         if (mode >= ARRAY_SIZE(ams_delta_audio_mode))
197                 return -EINVAL;
198 
199         ucontrol->value.enumerated.item[0] = mode;
200 
201         return 0;
202 }
203 
204 static const SOC_ENUM_SINGLE_EXT_DECL(ams_delta_audio_enum,
205                                       ams_delta_audio_mode);
206 
207 static const struct snd_kcontrol_new ams_delta_audio_controls[] = {
208         SOC_ENUM_EXT("Audio Mode", ams_delta_audio_enum,
209                         ams_delta_get_audio_mode, ams_delta_set_audio_mode),
210 };
211 
212 /* Hook switch */
213 static struct snd_soc_jack ams_delta_hook_switch;
214 static struct snd_soc_jack_gpio ams_delta_hook_switch_gpios[] = {
215         {
216                 .gpio = 4,
217                 .name = "hook_switch",
218                 .report = SND_JACK_HEADSET,
219                 .invert = 1,
220                 .debounce_time = 150,
221         }
222 };
223 
224 /* After we are able to control the codec over the modem,
225  * the hook switch can be used for dynamic DAPM reconfiguration. */
226 static struct snd_soc_jack_pin ams_delta_hook_switch_pins[] = {
227         /* Handset */
228         {
229                 .pin = "Mouthpiece",
230                 .mask = SND_JACK_MICROPHONE,
231         },
232         {
233                 .pin = "Earpiece",
234                 .mask = SND_JACK_HEADPHONE,
235         },
236         /* Handsfree */
237         {
238                 .pin = "Microphone",
239                 .mask = SND_JACK_MICROPHONE,
240                 .invert = 1,
241         },
242         {
243                 .pin = "Speaker",
244                 .mask = SND_JACK_HEADPHONE,
245                 .invert = 1,
246         },
247 };
248 
249 
250 /*
251  * Modem line discipline, required for making above controls functional.
252  * Activated from userspace with ldattach, possibly invoked from udev rule.
253  */
254 
255 /* To actually apply any modem controlled configuration changes to the codec,
256  * we must connect codec DAI pins to the modem for a moment.  Be careful not
257  * to interfere with our digital mute function that shares the same hardware. */
258 static struct timer_list cx81801_timer;
259 static bool cx81801_cmd_pending;
260 static bool ams_delta_muted;
261 static DEFINE_SPINLOCK(ams_delta_lock);
262 
263 static void cx81801_timeout(unsigned long data)
264 {
265         int muted;
266 
267         spin_lock(&ams_delta_lock);
268         cx81801_cmd_pending = 0;
269         muted = ams_delta_muted;
270         spin_unlock(&ams_delta_lock);
271 
272         /* Reconnect the codec DAI back from the modem to the CPU DAI
273          * only if digital mute still off */
274         if (!muted)
275                 ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC, 0);
276 }
277 
278 /* Line discipline .open() */
279 static int cx81801_open(struct tty_struct *tty)
280 {
281         int ret;
282 
283         if (!cx20442_codec)
284                 return -ENODEV;
285 
286         /*
287          * Pass the codec structure pointer for use by other ldisc callbacks,
288          * both the card and the codec specific parts.
289          */
290         tty->disc_data = cx20442_codec;
291 
292         ret = v253_ops.open(tty);
293 
294         if (ret < 0)
295                 tty->disc_data = NULL;
296 
297         return ret;
298 }
299 
300 /* Line discipline .close() */
301 static void cx81801_close(struct tty_struct *tty)
302 {
303         struct snd_soc_codec *codec = tty->disc_data;
304         struct snd_soc_dapm_context *dapm = &codec->component.card->dapm;
305 
306         del_timer_sync(&cx81801_timer);
307 
308         /* Prevent the hook switch from further changing the DAPM pins */
309         INIT_LIST_HEAD(&ams_delta_hook_switch.pins);
310 
311         if (!codec)
312                 return;
313 
314         v253_ops.close(tty);
315 
316         /* Revert back to default audio input/output constellation */
317         snd_soc_dapm_mutex_lock(dapm);
318 
319         snd_soc_dapm_disable_pin_unlocked(dapm, "Mouthpiece");
320         snd_soc_dapm_enable_pin_unlocked(dapm, "Earpiece");
321         snd_soc_dapm_enable_pin_unlocked(dapm, "Microphone");
322         snd_soc_dapm_disable_pin_unlocked(dapm, "Speaker");
323         snd_soc_dapm_disable_pin_unlocked(dapm, "AGCIN");
324 
325         snd_soc_dapm_sync_unlocked(dapm);
326 
327         snd_soc_dapm_mutex_unlock(dapm);
328 }
329 
330 /* Line discipline .hangup() */
331 static int cx81801_hangup(struct tty_struct *tty)
332 {
333         cx81801_close(tty);
334         return 0;
335 }
336 
337 /* Line discipline .receive_buf() */
338 static void cx81801_receive(struct tty_struct *tty,
339                                 const unsigned char *cp, char *fp, int count)
340 {
341         struct snd_soc_codec *codec = tty->disc_data;
342         const unsigned char *c;
343         int apply, ret;
344 
345         if (!codec)
346                 return;
347 
348         if (!codec->hw_write) {
349                 /* First modem response, complete setup procedure */
350 
351                 /* Initialize timer used for config pulse generation */
352                 setup_timer(&cx81801_timer, cx81801_timeout, 0);
353 
354                 v253_ops.receive_buf(tty, cp, fp, count);
355 
356                 /* Link hook switch to DAPM pins */
357                 ret = snd_soc_jack_add_pins(&ams_delta_hook_switch,
358                                         ARRAY_SIZE(ams_delta_hook_switch_pins),
359                                         ams_delta_hook_switch_pins);
360                 if (ret)
361                         dev_warn(codec->dev,
362                                 "Failed to link hook switch to DAPM pins, "
363                                 "will continue with hook switch unlinked.\n");
364 
365                 return;
366         }
367 
368         v253_ops.receive_buf(tty, cp, fp, count);
369 
370         for (c = &cp[count - 1]; c >= cp; c--) {
371                 if (*c != '\r')
372                         continue;
373                 /* Complete modem response received, apply config to codec */
374 
375                 spin_lock_bh(&ams_delta_lock);
376                 mod_timer(&cx81801_timer, jiffies + msecs_to_jiffies(150));
377                 apply = !ams_delta_muted && !cx81801_cmd_pending;
378                 cx81801_cmd_pending = 1;
379                 spin_unlock_bh(&ams_delta_lock);
380 
381                 /* Apply config pulse by connecting the codec to the modem
382                  * if not already done */
383                 if (apply)
384                         ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC,
385                                                 AMS_DELTA_LATCH2_MODEM_CODEC);
386                 break;
387         }
388 }
389 
390 /* Line discipline .write_wakeup() */
391 static void cx81801_wakeup(struct tty_struct *tty)
392 {
393         v253_ops.write_wakeup(tty);
394 }
395 
396 static struct tty_ldisc_ops cx81801_ops = {
397         .magic = TTY_LDISC_MAGIC,
398         .name = "cx81801",
399         .owner = THIS_MODULE,
400         .open = cx81801_open,
401         .close = cx81801_close,
402         .hangup = cx81801_hangup,
403         .receive_buf = cx81801_receive,
404         .write_wakeup = cx81801_wakeup,
405 };
406 
407 
408 /*
409  * Even if not very useful, the sound card can still work without any of the
410  * above functonality activated.  You can still control its audio input/output
411  * constellation and speakerphone gain from userspace by issuing AT commands
412  * over the modem port.
413  */
414 
415 static int ams_delta_hw_params(struct snd_pcm_substream *substream,
416                          struct snd_pcm_hw_params *params)
417 {
418         struct snd_soc_pcm_runtime *rtd = substream->private_data;
419 
420         /* Set cpu DAI configuration */
421         return snd_soc_dai_set_fmt(rtd->cpu_dai,
422                                    SND_SOC_DAIFMT_DSP_A |
423                                    SND_SOC_DAIFMT_NB_NF |
424                                    SND_SOC_DAIFMT_CBM_CFM);
425 }
426 
427 static struct snd_soc_ops ams_delta_ops = {
428         .hw_params = ams_delta_hw_params,
429 };
430 
431 
432 /* Digital mute implemented using modem/CPU multiplexer.
433  * Shares hardware with codec config pulse generation */
434 static bool ams_delta_muted = 1;
435 
436 static int ams_delta_digital_mute(struct snd_soc_dai *dai, int mute)
437 {
438         int apply;
439 
440         if (ams_delta_muted == mute)
441                 return 0;
442 
443         spin_lock_bh(&ams_delta_lock);
444         ams_delta_muted = mute;
445         apply = !cx81801_cmd_pending;
446         spin_unlock_bh(&ams_delta_lock);
447 
448         if (apply)
449                 ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC,
450                                 mute ? AMS_DELTA_LATCH2_MODEM_CODEC : 0);
451         return 0;
452 }
453 
454 /* Our codec DAI probably doesn't have its own .ops structure */
455 static const struct snd_soc_dai_ops ams_delta_dai_ops = {
456         .digital_mute = ams_delta_digital_mute,
457 };
458 
459 /* Will be used if the codec ever has its own digital_mute function */
460 static int ams_delta_startup(struct snd_pcm_substream *substream)
461 {
462         return ams_delta_digital_mute(NULL, 0);
463 }
464 
465 static void ams_delta_shutdown(struct snd_pcm_substream *substream)
466 {
467         ams_delta_digital_mute(NULL, 1);
468 }
469 
470 
471 /*
472  * Card initialization
473  */
474 
475 static int ams_delta_cx20442_init(struct snd_soc_pcm_runtime *rtd)
476 {
477         struct snd_soc_dai *codec_dai = rtd->codec_dai;
478         struct snd_soc_card *card = rtd->card;
479         struct snd_soc_dapm_context *dapm = &card->dapm;
480         int ret;
481         /* Codec is ready, now add/activate board specific controls */
482 
483         /* Store a pointer to the codec structure for tty ldisc use */
484         cx20442_codec = rtd->codec;
485 
486         /* Set up digital mute if not provided by the codec */
487         if (!codec_dai->driver->ops) {
488                 codec_dai->driver->ops = &ams_delta_dai_ops;
489         } else {
490                 ams_delta_ops.startup = ams_delta_startup;
491                 ams_delta_ops.shutdown = ams_delta_shutdown;
492         }
493 
494         /* Add hook switch - can be used to control the codec from userspace
495          * even if line discipline fails */
496         ret = snd_soc_jack_new(rtd->codec, "hook_switch",
497                                 SND_JACK_HEADSET, &ams_delta_hook_switch);
498         if (ret)
499                 dev_warn(card->dev,
500                                 "Failed to allocate resources for hook switch, "
501                                 "will continue without one.\n");
502         else {
503                 ret = snd_soc_jack_add_gpios(&ams_delta_hook_switch,
504                                         ARRAY_SIZE(ams_delta_hook_switch_gpios),
505                                         ams_delta_hook_switch_gpios);
506                 if (ret)
507                         dev_warn(card->dev,
508                                 "Failed to set up hook switch GPIO line, "
509                                 "will continue with hook switch inactive.\n");
510         }
511 
512         /* Register optional line discipline for over the modem control */
513         ret = tty_register_ldisc(N_V253, &cx81801_ops);
514         if (ret) {
515                 dev_warn(card->dev,
516                                 "Failed to register line discipline, "
517                                 "will continue without any controls.\n");
518                 return 0;
519         }
520 
521         /* Set up initial pin constellation */
522         snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
523         snd_soc_dapm_disable_pin(dapm, "Speaker");
524         snd_soc_dapm_disable_pin(dapm, "AGCIN");
525         snd_soc_dapm_disable_pin(dapm, "AGCOUT");
526 
527         return 0;
528 }
529 
530 static int ams_delta_card_remove(struct snd_soc_card *card)
531 {
532         snd_soc_jack_free_gpios(&ams_delta_hook_switch,
533                         ARRAY_SIZE(ams_delta_hook_switch_gpios),
534                         ams_delta_hook_switch_gpios);
535 
536         return 0;
537 }
538 
539 /* DAI glue - connects codec <--> CPU */
540 static struct snd_soc_dai_link ams_delta_dai_link = {
541         .name = "CX20442",
542         .stream_name = "CX20442",
543         .cpu_dai_name = "omap-mcbsp.1",
544         .codec_dai_name = "cx20442-voice",
545         .init = ams_delta_cx20442_init,
546         .platform_name = "omap-mcbsp.1",
547         .codec_name = "cx20442-codec",
548         .ops = &ams_delta_ops,
549 };
550 
551 /* Audio card driver */
552 static struct snd_soc_card ams_delta_audio_card = {
553         .name = "AMS_DELTA",
554         .owner = THIS_MODULE,
555         .remove = ams_delta_card_remove,
556         .dai_link = &ams_delta_dai_link,
557         .num_links = 1,
558 
559         .controls = ams_delta_audio_controls,
560         .num_controls = ARRAY_SIZE(ams_delta_audio_controls),
561         .dapm_widgets = ams_delta_dapm_widgets,
562         .num_dapm_widgets = ARRAY_SIZE(ams_delta_dapm_widgets),
563         .dapm_routes = ams_delta_audio_map,
564         .num_dapm_routes = ARRAY_SIZE(ams_delta_audio_map),
565 };
566 
567 /* Module init/exit */
568 static int ams_delta_probe(struct platform_device *pdev)
569 {
570         struct snd_soc_card *card = &ams_delta_audio_card;
571         int ret;
572 
573         card->dev = &pdev->dev;
574 
575         ret = snd_soc_register_card(card);
576         if (ret) {
577                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
578                 card->dev = NULL;
579                 return ret;
580         }
581         return 0;
582 }
583 
584 static int ams_delta_remove(struct platform_device *pdev)
585 {
586         struct snd_soc_card *card = platform_get_drvdata(pdev);
587 
588         if (tty_unregister_ldisc(N_V253) != 0)
589                 dev_warn(&pdev->dev,
590                         "failed to unregister V253 line discipline\n");
591 
592         snd_soc_unregister_card(card);
593         card->dev = NULL;
594         return 0;
595 }
596 
597 #define DRV_NAME "ams-delta-audio"
598 
599 static struct platform_driver ams_delta_driver = {
600         .driver = {
601                 .name = DRV_NAME,
602                 .owner = THIS_MODULE,
603         },
604         .probe = ams_delta_probe,
605         .remove = ams_delta_remove,
606 };
607 
608 module_platform_driver(ams_delta_driver);
609 
610 MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
611 MODULE_DESCRIPTION("ALSA SoC driver for Amstrad E3 (Delta) videophone");
612 MODULE_LICENSE("GPL");
613 MODULE_ALIAS("platform:" DRV_NAME);
614 

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