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>
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"},
91 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
94 u8 *reg_cache = codec->reg_cache;
96 if (reg >= codec->driver->reg_cache_size)
99 return reg_cache[reg];
126 static int cx20442_pm_to_v253_vls(u8 value)
128 switch (value & ~(1 << CX20442_AGC)) {
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):
139 case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
140 return V253_VLS_NONE;
144 static int cx20442_pm_to_v253_vsp(u8 value)
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));
152 return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
155 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
158 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
159 u8 *reg_cache = codec->reg_cache;
160 int vls, vsp, old, len;
163 if (reg >= codec->driver->reg_cache_size)
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)
171 old = reg_cache[reg];
172 reg_cache[reg] = value;
174 vls = cx20442_pm_to_v253_vls(value);
178 vsp = cx20442_pm_to_v253_vsp(value);
182 if ((vls == V253_VLS_T) ||
183 (vls == cx20442_pm_to_v253_vls(old))) {
184 if (vsp == cx20442_pm_to_v253_vsp(old))
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);
190 len = snprintf(buf, ARRAY_SIZE(buf),
191 "at+vls=%d;+vsp=%d\r", vls, vsp);
193 if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
196 dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
197 if (codec->hw_write(cx20442->control_data, buf, len) != len)
205 * Line discpline related code
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.
213 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
214 static const char *v253_init = "ate0m0q0+fclass=8\r";
216 /* Line discipline .open() */
217 static int v253_open(struct tty_struct *tty)
219 int ret, len = strlen(v253_init);
221 /* Doesn't make sense without write callback */
222 if (!tty->ops->write)
225 /* Won't work if no codec pointer has been passed by a card driver */
229 if (tty->ops->write(tty, v253_init, len) != len) {
233 /* Actual setup will be performed after the modem responds. */
236 tty->disc_data = NULL;
240 /* Line discipline .close() */
241 static void v253_close(struct tty_struct *tty)
243 struct snd_soc_codec *codec = tty->disc_data;
244 struct cx20442_priv *cx20442;
246 tty->disc_data = NULL;
251 cx20442 = snd_soc_codec_get_drvdata(codec);
253 /* Prevent the codec driver from further accessing the modem */
254 codec->hw_write = NULL;
255 cx20442->control_data = NULL;
256 codec->component.card->pop_time = 0;
259 /* Line discipline .hangup() */
260 static int v253_hangup(struct tty_struct *tty)
266 /* Line discipline .receive_buf() */
267 static void v253_receive(struct tty_struct *tty,
268 const unsigned char *cp, char *fp, int count)
270 struct snd_soc_codec *codec = tty->disc_data;
271 struct cx20442_priv *cx20442;
276 cx20442 = snd_soc_codec_get_drvdata(codec);
278 if (!cx20442->control_data) {
279 /* First modem response, complete setup procedure */
281 /* Set up codec driver access to modem controls */
282 cx20442->control_data = tty;
283 codec->hw_write = (hw_write_t)tty->ops->write;
284 codec->component.card->pop_time = 1;
288 /* Line discipline .write_wakeup() */
289 static void v253_wakeup(struct tty_struct *tty)
293 struct tty_ldisc_ops v253_ops = {
294 .magic = TTY_LDISC_MAGIC,
296 .owner = THIS_MODULE,
299 .hangup = v253_hangup,
300 .receive_buf = v253_receive,
301 .write_wakeup = v253_wakeup,
303 EXPORT_SYMBOL_GPL(v253_ops);
310 static struct snd_soc_dai_driver cx20442_dai = {
311 .name = "cx20442-voice",
313 .stream_name = "Playback",
316 .rates = SNDRV_PCM_RATE_8000,
317 .formats = SNDRV_PCM_FMTBIT_S16_LE,
320 .stream_name = "Capture",
323 .rates = SNDRV_PCM_RATE_8000,
324 .formats = SNDRV_PCM_FMTBIT_S16_LE,
328 static int cx20442_set_bias_level(struct snd_soc_codec *codec,
329 enum snd_soc_bias_level level)
331 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
335 case SND_SOC_BIAS_PREPARE:
336 if (codec->dapm.bias_level != SND_SOC_BIAS_STANDBY)
338 if (IS_ERR(cx20442->por))
339 err = PTR_ERR(cx20442->por);
341 err = regulator_enable(cx20442->por);
343 case SND_SOC_BIAS_STANDBY:
344 if (codec->dapm.bias_level != SND_SOC_BIAS_PREPARE)
346 if (IS_ERR(cx20442->por))
347 err = PTR_ERR(cx20442->por);
349 err = regulator_disable(cx20442->por);
355 codec->dapm.bias_level = level;
360 static int cx20442_codec_probe(struct snd_soc_codec *codec)
362 struct cx20442_priv *cx20442;
364 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
368 cx20442->por = regulator_get(codec->dev, "POR");
369 if (IS_ERR(cx20442->por))
370 dev_warn(codec->dev, "failed to get the regulator");
371 cx20442->control_data = NULL;
373 snd_soc_codec_set_drvdata(codec, cx20442);
374 codec->hw_write = NULL;
375 codec->component.card->pop_time = 0;
380 /* power down chip */
381 static int cx20442_codec_remove(struct snd_soc_codec *codec)
383 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
385 if (cx20442->control_data) {
386 struct tty_struct *tty = cx20442->control_data;
390 if (!IS_ERR(cx20442->por)) {
391 /* should be already in STANDBY, hence disabled */
392 regulator_put(cx20442->por);
395 snd_soc_codec_set_drvdata(codec, NULL);
400 static const u8 cx20442_reg;
402 static struct snd_soc_codec_driver cx20442_codec_dev = {
403 .probe = cx20442_codec_probe,
404 .remove = cx20442_codec_remove,
405 .set_bias_level = cx20442_set_bias_level,
406 .reg_cache_default = &cx20442_reg,
408 .reg_word_size = sizeof(u8),
409 .read = cx20442_read_reg_cache,
410 .write = cx20442_write,
411 .dapm_widgets = cx20442_dapm_widgets,
412 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
413 .dapm_routes = cx20442_audio_map,
414 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
417 static int cx20442_platform_probe(struct platform_device *pdev)
419 return snd_soc_register_codec(&pdev->dev,
420 &cx20442_codec_dev, &cx20442_dai, 1);
423 static int __exit cx20442_platform_remove(struct platform_device *pdev)
425 snd_soc_unregister_codec(&pdev->dev);
429 static struct platform_driver cx20442_platform_driver = {
431 .name = "cx20442-codec",
432 .owner = THIS_MODULE,
434 .probe = cx20442_platform_probe,
435 .remove = __exit_p(cx20442_platform_remove),
438 module_platform_driver(cx20442_platform_driver);
440 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
441 MODULE_AUTHOR("Janusz Krzysztofik");
442 MODULE_LICENSE("GPL");
443 MODULE_ALIAS("platform:cx20442-codec");