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Linux/sound/soc/codecs/cx20442.c

  1 /*
  2  * cx20442.c  --  CX20442 ALSA Soc Audio driver
  3  *
  4  * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
  5  *
  6  * Initially based on sound/soc/codecs/wm8400.c
  7  * Copyright 2008, 2009 Wolfson Microelectronics PLC.
  8  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  9  *
 10  *  This program is free software; you can redistribute  it and/or modify it
 11  *  under  the terms of  the GNU General  Public License as published by the
 12  *  Free Software Foundation;  either version 2 of the  License, or (at your
 13  *  option) any later version.
 14  */
 15 
 16 #include <linux/tty.h>
 17 #include <linux/slab.h>
 18 #include <linux/module.h>
 19 #include <linux/regulator/consumer.h>
 20 
 21 #include <sound/core.h>
 22 #include <sound/initval.h>
 23 #include <sound/soc.h>
 24 
 25 #include "cx20442.h"
 26 
 27 
 28 struct cx20442_priv {
 29         void *control_data;
 30         struct regulator *por;
 31 };
 32 
 33 #define CX20442_PM              0x0
 34 
 35 #define CX20442_TELIN           0
 36 #define CX20442_TELOUT          1
 37 #define CX20442_MIC             2
 38 #define CX20442_SPKOUT          3
 39 #define CX20442_AGC             4
 40 
 41 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
 42         SND_SOC_DAPM_OUTPUT("TELOUT"),
 43         SND_SOC_DAPM_OUTPUT("SPKOUT"),
 44         SND_SOC_DAPM_OUTPUT("AGCOUT"),
 45 
 46         SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
 47 
 48         SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
 49         SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
 50         SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
 51 
 52         SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
 53         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
 54 
 55         SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
 56 
 57         SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
 58         SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
 59 
 60         SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
 61 
 62         SND_SOC_DAPM_INPUT("TELIN"),
 63         SND_SOC_DAPM_INPUT("MIC"),
 64         SND_SOC_DAPM_INPUT("AGCIN"),
 65 };
 66 
 67 static const struct snd_soc_dapm_route cx20442_audio_map[] = {
 68         {"TELOUT", NULL, "TELOUT Amp"},
 69 
 70         {"SPKOUT", NULL, "SPKOUT Mixer"},
 71         {"SPKOUT Mixer", NULL, "SPKOUT Amp"},
 72 
 73         {"TELOUT Amp", NULL, "DAC"},
 74         {"SPKOUT Amp", NULL, "DAC"},
 75 
 76         {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
 77         {"SPKOUT AGC", NULL, "AGCIN"},
 78 
 79         {"AGCOUT", NULL, "MIC AGC"},
 80         {"MIC AGC", NULL, "MIC"},
 81 
 82         {"MIC Bias", NULL, "MIC"},
 83         {"Input Mixer", NULL, "MIC Bias"},
 84 
 85         {"TELIN Bias", NULL, "TELIN"},
 86         {"Input Mixer", NULL, "TELIN Bias"},
 87 
 88         {"ADC", NULL, "Input Mixer"},
 89 };
 90 
 91 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
 92                                                         unsigned int reg)
 93 {
 94         u8 *reg_cache = codec->reg_cache;
 95 
 96         if (reg >= codec->driver->reg_cache_size)
 97                 return -EINVAL;
 98 
 99         return reg_cache[reg];
100 }
101 
102 enum v253_vls {
103         V253_VLS_NONE = 0,
104         V253_VLS_T,
105         V253_VLS_L,
106         V253_VLS_LT,
107         V253_VLS_S,
108         V253_VLS_ST,
109         V253_VLS_M,
110         V253_VLS_MST,
111         V253_VLS_S1,
112         V253_VLS_S1T,
113         V253_VLS_MS1T,
114         V253_VLS_M1,
115         V253_VLS_M1ST,
116         V253_VLS_M1S1T,
117         V253_VLS_H,
118         V253_VLS_HT,
119         V253_VLS_MS,
120         V253_VLS_MS1,
121         V253_VLS_M1S,
122         V253_VLS_M1S1,
123         V253_VLS_TEST,
124 };
125 
126 static int cx20442_pm_to_v253_vls(u8 value)
127 {
128         switch (value & ~(1 << CX20442_AGC)) {
129         case 0:
130                 return V253_VLS_T;
131         case (1 << CX20442_SPKOUT):
132         case (1 << CX20442_MIC):
133         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
134                 return V253_VLS_M1S1;
135         case (1 << CX20442_TELOUT):
136         case (1 << CX20442_TELIN):
137         case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
138                 return V253_VLS_L;
139         case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
140                 return V253_VLS_NONE;
141         }
142         return -EINVAL;
143 }
144 static int cx20442_pm_to_v253_vsp(u8 value)
145 {
146         switch (value & ~(1 << CX20442_AGC)) {
147         case (1 << CX20442_SPKOUT):
148         case (1 << CX20442_MIC):
149         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
150                 return (bool)(value & (1 << CX20442_AGC));
151         }
152         return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
153 }
154 
155 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
156                                                         unsigned int value)
157 {
158         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
159         u8 *reg_cache = codec->reg_cache;
160         int vls, vsp, old, len;
161         char buf[18];
162 
163         if (reg >= codec->driver->reg_cache_size)
164                 return -EINVAL;
165 
166         /* hw_write and control_data pointers required for talking to the modem
167          * are expected to be set by the line discipline initialization code */
168         if (!codec->hw_write || !cx20442->control_data)
169                 return -EIO;
170 
171         old = reg_cache[reg];
172         reg_cache[reg] = value;
173 
174         vls = cx20442_pm_to_v253_vls(value);
175         if (vls < 0)
176                 return vls;
177 
178         vsp = cx20442_pm_to_v253_vsp(value);
179         if (vsp < 0)
180                 return vsp;
181 
182         if ((vls == V253_VLS_T) ||
183                         (vls == cx20442_pm_to_v253_vls(old))) {
184                 if (vsp == cx20442_pm_to_v253_vsp(old))
185                         return 0;
186                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
187         } else if (vsp == cx20442_pm_to_v253_vsp(old))
188                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
189         else
190                 len = snprintf(buf, ARRAY_SIZE(buf),
191                                         "at+vls=%d;+vsp=%d\r", vls, vsp);
192 
193         if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
194                 return -ENOMEM;
195 
196         dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
197         if (codec->hw_write(cx20442->control_data, buf, len) != len)
198                 return -EIO;
199 
200         return 0;
201 }
202 
203 
204 /*
205  * Line discpline related code
206  *
207  * Any of the callback functions below can be used in two ways:
208  * 1) registerd by a machine driver as one of line discipline operations,
209  * 2) called from a machine's provided line discipline callback function
210  *    in case when extra machine specific code must be run as well.
211  */
212 
213 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
214 static const char *v253_init = "ate0m0q0+fclass=8\r";
215 
216 /* Line discipline .open() */
217 static int v253_open(struct tty_struct *tty)
218 {
219         int ret, len = strlen(v253_init);
220 
221         /* Doesn't make sense without write callback */
222         if (!tty->ops->write)
223                 return -EINVAL;
224 
225         /* Won't work if no codec pointer has been passed by a card driver */
226         if (!tty->disc_data)
227                 return -ENODEV;
228 
229         tty->receive_room = 16;
230         if (tty->ops->write(tty, v253_init, len) != len) {
231                 ret = -EIO;
232                 goto err;
233         }
234         /* Actual setup will be performed after the modem responds. */
235         return 0;
236 err:
237         tty->disc_data = NULL;
238         return ret;
239 }
240 
241 /* Line discipline .close() */
242 static void v253_close(struct tty_struct *tty)
243 {
244         struct snd_soc_codec *codec = tty->disc_data;
245         struct cx20442_priv *cx20442;
246 
247         tty->disc_data = NULL;
248 
249         if (!codec)
250                 return;
251 
252         cx20442 = snd_soc_codec_get_drvdata(codec);
253 
254         /* Prevent the codec driver from further accessing the modem */
255         codec->hw_write = NULL;
256         cx20442->control_data = NULL;
257         codec->component.card->pop_time = 0;
258 }
259 
260 /* Line discipline .hangup() */
261 static int v253_hangup(struct tty_struct *tty)
262 {
263         v253_close(tty);
264         return 0;
265 }
266 
267 /* Line discipline .receive_buf() */
268 static void v253_receive(struct tty_struct *tty,
269                                 const unsigned char *cp, char *fp, int count)
270 {
271         struct snd_soc_codec *codec = tty->disc_data;
272         struct cx20442_priv *cx20442;
273 
274         if (!codec)
275                 return;
276 
277         cx20442 = snd_soc_codec_get_drvdata(codec);
278 
279         if (!cx20442->control_data) {
280                 /* First modem response, complete setup procedure */
281 
282                 /* Set up codec driver access to modem controls */
283                 cx20442->control_data = tty;
284                 codec->hw_write = (hw_write_t)tty->ops->write;
285                 codec->component.card->pop_time = 1;
286         }
287 }
288 
289 /* Line discipline .write_wakeup() */
290 static void v253_wakeup(struct tty_struct *tty)
291 {
292 }
293 
294 struct tty_ldisc_ops v253_ops = {
295         .magic = TTY_LDISC_MAGIC,
296         .name = "cx20442",
297         .owner = THIS_MODULE,
298         .open = v253_open,
299         .close = v253_close,
300         .hangup = v253_hangup,
301         .receive_buf = v253_receive,
302         .write_wakeup = v253_wakeup,
303 };
304 EXPORT_SYMBOL_GPL(v253_ops);
305 
306 
307 /*
308  * Codec DAI
309  */
310 
311 static struct snd_soc_dai_driver cx20442_dai = {
312         .name = "cx20442-voice",
313         .playback = {
314                 .stream_name = "Playback",
315                 .channels_min = 1,
316                 .channels_max = 1,
317                 .rates = SNDRV_PCM_RATE_8000,
318                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
319         },
320         .capture = {
321                 .stream_name = "Capture",
322                 .channels_min = 1,
323                 .channels_max = 1,
324                 .rates = SNDRV_PCM_RATE_8000,
325                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
326         },
327 };
328 
329 static int cx20442_set_bias_level(struct snd_soc_codec *codec,
330                 enum snd_soc_bias_level level)
331 {
332         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
333         int err = 0;
334 
335         switch (level) {
336         case SND_SOC_BIAS_PREPARE:
337                 if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_STANDBY)
338                         break;
339                 if (IS_ERR(cx20442->por))
340                         err = PTR_ERR(cx20442->por);
341                 else
342                         err = regulator_enable(cx20442->por);
343                 break;
344         case SND_SOC_BIAS_STANDBY:
345                 if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_PREPARE)
346                         break;
347                 if (IS_ERR(cx20442->por))
348                         err = PTR_ERR(cx20442->por);
349                 else
350                         err = regulator_disable(cx20442->por);
351                 break;
352         default:
353                 break;
354         }
355 
356         return err;
357 }
358 
359 static int cx20442_codec_probe(struct snd_soc_codec *codec)
360 {
361         struct cx20442_priv *cx20442;
362 
363         cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
364         if (cx20442 == NULL)
365                 return -ENOMEM;
366 
367         cx20442->por = regulator_get(codec->dev, "POR");
368         if (IS_ERR(cx20442->por))
369                 dev_warn(codec->dev, "failed to get the regulator");
370         cx20442->control_data = NULL;
371 
372         snd_soc_codec_set_drvdata(codec, cx20442);
373         codec->hw_write = NULL;
374         codec->component.card->pop_time = 0;
375 
376         return 0;
377 }
378 
379 /* power down chip */
380 static int cx20442_codec_remove(struct snd_soc_codec *codec)
381 {
382         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
383 
384         if (cx20442->control_data) {
385                 struct tty_struct *tty = cx20442->control_data;
386                 tty_hangup(tty);
387         }
388 
389         if (!IS_ERR(cx20442->por)) {
390                 /* should be already in STANDBY, hence disabled */
391                 regulator_put(cx20442->por);
392         }
393 
394         snd_soc_codec_set_drvdata(codec, NULL);
395         kfree(cx20442);
396         return 0;
397 }
398 
399 static const u8 cx20442_reg;
400 
401 static struct snd_soc_codec_driver cx20442_codec_dev = {
402         .probe =        cx20442_codec_probe,
403         .remove =       cx20442_codec_remove,
404         .set_bias_level = cx20442_set_bias_level,
405         .reg_cache_default = &cx20442_reg,
406         .reg_cache_size = 1,
407         .reg_word_size = sizeof(u8),
408         .read = cx20442_read_reg_cache,
409         .write = cx20442_write,
410         .dapm_widgets = cx20442_dapm_widgets,
411         .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
412         .dapm_routes = cx20442_audio_map,
413         .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
414 };
415 
416 static int cx20442_platform_probe(struct platform_device *pdev)
417 {
418         return snd_soc_register_codec(&pdev->dev,
419                         &cx20442_codec_dev, &cx20442_dai, 1);
420 }
421 
422 static int cx20442_platform_remove(struct platform_device *pdev)
423 {
424         snd_soc_unregister_codec(&pdev->dev);
425         return 0;
426 }
427 
428 static struct platform_driver cx20442_platform_driver = {
429         .driver = {
430                 .name = "cx20442-codec",
431                 },
432         .probe = cx20442_platform_probe,
433         .remove = cx20442_platform_remove,
434 };
435 
436 module_platform_driver(cx20442_platform_driver);
437 
438 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
439 MODULE_AUTHOR("Janusz Krzysztofik");
440 MODULE_LICENSE("GPL");
441 MODULE_ALIAS("platform:cx20442-codec");
442 

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