2 * cx20442.c -- CX20442 ALSA Soc Audio driver
4 * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
6 * Initially based on sound/soc/codecs/wm8400.c
7 * Copyright 2008, 2009 Wolfson Microelectronics PLC.
8 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
16 #include <linux/tty.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/regulator/consumer.h>
21 #include <sound/core.h>
22 #include <sound/initval.h>
23 #include <sound/soc.h>
29 struct tty_struct *tty;
30 struct regulator *por;
33 #define CX20442_PM 0x0
35 #define CX20442_TELIN 0
36 #define CX20442_TELOUT 1
38 #define CX20442_SPKOUT 3
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"),
46 SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
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),
52 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
53 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
55 SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
57 SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
58 SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
60 SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
62 SND_SOC_DAPM_INPUT("TELIN"),
63 SND_SOC_DAPM_INPUT("MIC"),
64 SND_SOC_DAPM_INPUT("AGCIN"),
67 static const struct snd_soc_dapm_route cx20442_audio_map[] = {
68 {"TELOUT", NULL, "TELOUT Amp"},
70 {"SPKOUT", NULL, "SPKOUT Mixer"},
71 {"SPKOUT Mixer", NULL, "SPKOUT Amp"},
73 {"TELOUT Amp", NULL, "DAC"},
74 {"SPKOUT Amp", NULL, "DAC"},
76 {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
77 {"SPKOUT AGC", NULL, "AGCIN"},
79 {"AGCOUT", NULL, "MIC AGC"},
80 {"MIC AGC", NULL, "MIC"},
82 {"MIC Bias", NULL, "MIC"},
83 {"Input Mixer", NULL, "MIC Bias"},
85 {"TELIN Bias", NULL, "TELIN"},
86 {"Input Mixer", NULL, "TELIN Bias"},
88 {"ADC", NULL, "Input Mixer"},
116 /* FIXME : these function will be re-used */
117 static int cx20442_pm_to_v253_vls(u8 value)
119 switch (value & ~(1 << CX20442_AGC)) {
122 case (1 << CX20442_SPKOUT):
123 case (1 << CX20442_MIC):
124 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
125 return V253_VLS_M1S1;
126 case (1 << CX20442_TELOUT):
127 case (1 << CX20442_TELIN):
128 case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
130 case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
131 return V253_VLS_NONE;
135 static int cx20442_pm_to_v253_vsp(u8 value)
137 switch (value & ~(1 << CX20442_AGC)) {
138 case (1 << CX20442_SPKOUT):
139 case (1 << CX20442_MIC):
140 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
141 return (bool)(value & (1 << CX20442_AGC));
143 return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
146 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
149 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
150 u8 *reg_cache = codec->reg_cache;
151 int vls, vsp, old, len;
154 if (reg >= codec->driver->reg_cache_size)
157 /* tty and write pointers required for talking to the modem
158 * are expected to be set by the line discipline initialization code */
159 if (!cx20442->tty || !cx20442->tty->ops->write)
162 old = reg_cache[reg];
163 reg_cache[reg] = value;
165 vls = cx20442_pm_to_v253_vls(value);
169 vsp = cx20442_pm_to_v253_vsp(value);
173 if ((vls == V253_VLS_T) ||
174 (vls == cx20442_pm_to_v253_vls(old))) {
175 if (vsp == cx20442_pm_to_v253_vsp(old))
177 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
178 } else if (vsp == cx20442_pm_to_v253_vsp(old))
179 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
181 len = snprintf(buf, ARRAY_SIZE(buf),
182 "at+vls=%d;+vsp=%d\r", vls, vsp);
184 if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
187 dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
188 if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
196 * Line discpline related code
198 * Any of the callback functions below can be used in two ways:
199 * 1) registerd by a machine driver as one of line discipline operations,
200 * 2) called from a machine's provided line discipline callback function
201 * in case when extra machine specific code must be run as well.
204 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
205 static const char *v253_init = "ate0m0q0+fclass=8\r";
207 /* Line discipline .open() */
208 static int v253_open(struct tty_struct *tty)
210 int ret, len = strlen(v253_init);
212 /* Doesn't make sense without write callback */
213 if (!tty->ops->write)
216 /* Won't work if no codec pointer has been passed by a card driver */
220 tty->receive_room = 16;
221 if (tty->ops->write(tty, v253_init, len) != len) {
225 /* Actual setup will be performed after the modem responds. */
228 tty->disc_data = NULL;
232 /* Line discipline .close() */
233 static void v253_close(struct tty_struct *tty)
235 struct snd_soc_codec *codec = tty->disc_data;
236 struct cx20442_priv *cx20442;
238 tty->disc_data = NULL;
243 cx20442 = snd_soc_codec_get_drvdata(codec);
245 /* Prevent the codec driver from further accessing the modem */
247 codec->component.card->pop_time = 0;
250 /* Line discipline .hangup() */
251 static int v253_hangup(struct tty_struct *tty)
257 /* Line discipline .receive_buf() */
258 static void v253_receive(struct tty_struct *tty,
259 const unsigned char *cp, char *fp, int count)
261 struct snd_soc_codec *codec = tty->disc_data;
262 struct cx20442_priv *cx20442;
267 cx20442 = snd_soc_codec_get_drvdata(codec);
270 /* First modem response, complete setup procedure */
272 /* Set up codec driver access to modem controls */
274 codec->component.card->pop_time = 1;
278 /* Line discipline .write_wakeup() */
279 static void v253_wakeup(struct tty_struct *tty)
283 struct tty_ldisc_ops v253_ops = {
284 .magic = TTY_LDISC_MAGIC,
286 .owner = THIS_MODULE,
289 .hangup = v253_hangup,
290 .receive_buf = v253_receive,
291 .write_wakeup = v253_wakeup,
293 EXPORT_SYMBOL_GPL(v253_ops);
300 static struct snd_soc_dai_driver cx20442_dai = {
301 .name = "cx20442-voice",
303 .stream_name = "Playback",
306 .rates = SNDRV_PCM_RATE_8000,
307 .formats = SNDRV_PCM_FMTBIT_S16_LE,
310 .stream_name = "Capture",
313 .rates = SNDRV_PCM_RATE_8000,
314 .formats = SNDRV_PCM_FMTBIT_S16_LE,
318 static int cx20442_set_bias_level(struct snd_soc_codec *codec,
319 enum snd_soc_bias_level level)
321 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
325 case SND_SOC_BIAS_PREPARE:
326 if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_STANDBY)
328 if (IS_ERR(cx20442->por))
329 err = PTR_ERR(cx20442->por);
331 err = regulator_enable(cx20442->por);
333 case SND_SOC_BIAS_STANDBY:
334 if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_PREPARE)
336 if (IS_ERR(cx20442->por))
337 err = PTR_ERR(cx20442->por);
339 err = regulator_disable(cx20442->por);
348 static int cx20442_codec_probe(struct snd_soc_codec *codec)
350 struct cx20442_priv *cx20442;
352 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
356 cx20442->por = regulator_get(codec->dev, "POR");
357 if (IS_ERR(cx20442->por))
358 dev_warn(codec->dev, "failed to get the regulator");
361 snd_soc_codec_set_drvdata(codec, cx20442);
362 codec->component.card->pop_time = 0;
367 /* power down chip */
368 static int cx20442_codec_remove(struct snd_soc_codec *codec)
370 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
373 struct tty_struct *tty = cx20442->tty;
377 if (!IS_ERR(cx20442->por)) {
378 /* should be already in STANDBY, hence disabled */
379 regulator_put(cx20442->por);
382 snd_soc_codec_set_drvdata(codec, NULL);
387 static const u8 cx20442_reg;
389 static const struct snd_soc_codec_driver cx20442_codec_dev = {
390 .probe = cx20442_codec_probe,
391 .remove = cx20442_codec_remove,
392 .set_bias_level = cx20442_set_bias_level,
394 .component_driver = {
395 .dapm_widgets = cx20442_dapm_widgets,
396 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
397 .dapm_routes = cx20442_audio_map,
398 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
402 static int cx20442_platform_probe(struct platform_device *pdev)
404 return snd_soc_register_codec(&pdev->dev,
405 &cx20442_codec_dev, &cx20442_dai, 1);
408 static int cx20442_platform_remove(struct platform_device *pdev)
410 snd_soc_unregister_codec(&pdev->dev);
414 static struct platform_driver cx20442_platform_driver = {
416 .name = "cx20442-codec",
418 .probe = cx20442_platform_probe,
419 .remove = cx20442_platform_remove,
422 module_platform_driver(cx20442_platform_driver);
424 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
425 MODULE_AUTHOR("Janusz Krzysztofik");
426 MODULE_LICENSE("GPL");
427 MODULE_ALIAS("platform:cx20442-codec");