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 struct tty_struct *tty;
30 struct regulator *por;
31 u8 reg_cache;
32 };
33
34 #define CX20442_PM 0x0
35
36 #define CX20442_TELIN 0
37 #define CX20442_TELOUT 1
38 #define CX20442_MIC 2
39 #define CX20442_SPKOUT 3
40 #define CX20442_AGC 4
41
42 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
43 SND_SOC_DAPM_OUTPUT("TELOUT"),
44 SND_SOC_DAPM_OUTPUT("SPKOUT"),
45 SND_SOC_DAPM_OUTPUT("AGCOUT"),
46
47 SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
48
49 SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
50 SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
51 SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
52
53 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
54 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
55
56 SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
57
58 SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
59 SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
60
61 SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
62
63 SND_SOC_DAPM_INPUT("TELIN"),
64 SND_SOC_DAPM_INPUT("MIC"),
65 SND_SOC_DAPM_INPUT("AGCIN"),
66 };
67
68 static const struct snd_soc_dapm_route cx20442_audio_map[] = {
69 {"TELOUT", NULL, "TELOUT Amp"},
70
71 {"SPKOUT", NULL, "SPKOUT Mixer"},
72 {"SPKOUT Mixer", NULL, "SPKOUT Amp"},
73
74 {"TELOUT Amp", NULL, "DAC"},
75 {"SPKOUT Amp", NULL, "DAC"},
76
77 {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
78 {"SPKOUT AGC", NULL, "AGCIN"},
79
80 {"AGCOUT", NULL, "MIC AGC"},
81 {"MIC AGC", NULL, "MIC"},
82
83 {"MIC Bias", NULL, "MIC"},
84 {"Input Mixer", NULL, "MIC Bias"},
85
86 {"TELIN Bias", NULL, "TELIN"},
87 {"Input Mixer", NULL, "TELIN Bias"},
88
89 {"ADC", NULL, "Input Mixer"},
90 };
91
cx20442_read_reg_cache(struct snd_soc_component * component,unsigned int reg)92 static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component,
93 unsigned int reg)
94 {
95 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
96
97 if (reg >= 1)
98 return -EINVAL;
99
100 return cx20442->reg_cache;
101 }
102
103 enum v253_vls {
104 V253_VLS_NONE = 0,
105 V253_VLS_T,
106 V253_VLS_L,
107 V253_VLS_LT,
108 V253_VLS_S,
109 V253_VLS_ST,
110 V253_VLS_M,
111 V253_VLS_MST,
112 V253_VLS_S1,
113 V253_VLS_S1T,
114 V253_VLS_MS1T,
115 V253_VLS_M1,
116 V253_VLS_M1ST,
117 V253_VLS_M1S1T,
118 V253_VLS_H,
119 V253_VLS_HT,
120 V253_VLS_MS,
121 V253_VLS_MS1,
122 V253_VLS_M1S,
123 V253_VLS_M1S1,
124 V253_VLS_TEST,
125 };
126
cx20442_pm_to_v253_vls(u8 value)127 static int cx20442_pm_to_v253_vls(u8 value)
128 {
129 switch (value & ~(1 << CX20442_AGC)) {
130 case 0:
131 return V253_VLS_T;
132 case (1 << CX20442_SPKOUT):
133 case (1 << CX20442_MIC):
134 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
135 return V253_VLS_M1S1;
136 case (1 << CX20442_TELOUT):
137 case (1 << CX20442_TELIN):
138 case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
139 return V253_VLS_L;
140 case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
141 return V253_VLS_NONE;
142 }
143 return -EINVAL;
144 }
cx20442_pm_to_v253_vsp(u8 value)145 static int cx20442_pm_to_v253_vsp(u8 value)
146 {
147 switch (value & ~(1 << CX20442_AGC)) {
148 case (1 << CX20442_SPKOUT):
149 case (1 << CX20442_MIC):
150 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
151 return (bool)(value & (1 << CX20442_AGC));
152 }
153 return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
154 }
155
cx20442_write(struct snd_soc_component * component,unsigned int reg,unsigned int value)156 static int cx20442_write(struct snd_soc_component *component, unsigned int reg,
157 unsigned int value)
158 {
159 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
160 int vls, vsp, old, len;
161 char buf[18];
162
163 if (reg >= 1)
164 return -EINVAL;
165
166 /* tty and write pointers required for talking to the modem
167 * are expected to be set by the line discipline initialization code */
168 if (!cx20442->tty || !cx20442->tty->ops->write)
169 return -EIO;
170
171 old = cx20442->reg_cache;
172 cx20442->reg_cache = 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(component->dev, "%s: %s\n", __func__, buf);
197 if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
198 return -EIO;
199
200 return 0;
201 }
202
203 /*
204 * Line discpline related code
205 *
206 * Any of the callback functions below can be used in two ways:
207 * 1) registerd by a machine driver as one of line discipline operations,
208 * 2) called from a machine's provided line discipline callback function
209 * in case when extra machine specific code must be run as well.
210 */
211
212 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
213 static const char *v253_init = "ate0m0q0+fclass=8\r";
214
215 /* Line discipline .open() */
v253_open(struct tty_struct * tty)216 static int v253_open(struct tty_struct *tty)
217 {
218 int ret, len = strlen(v253_init);
219
220 /* Doesn't make sense without write callback */
221 if (!tty->ops->write)
222 return -EINVAL;
223
224 /* Won't work if no codec pointer has been passed by a card driver */
225 if (!tty->disc_data)
226 return -ENODEV;
227
228 tty->receive_room = 16;
229 if (tty->ops->write(tty, v253_init, len) != len) {
230 ret = -EIO;
231 goto err;
232 }
233 /* Actual setup will be performed after the modem responds. */
234 return 0;
235 err:
236 tty->disc_data = NULL;
237 return ret;
238 }
239
240 /* Line discipline .close() */
v253_close(struct tty_struct * tty)241 static void v253_close(struct tty_struct *tty)
242 {
243 struct snd_soc_component *component = tty->disc_data;
244 struct cx20442_priv *cx20442;
245
246 tty->disc_data = NULL;
247
248 if (!component)
249 return;
250
251 cx20442 = snd_soc_component_get_drvdata(component);
252
253 /* Prevent the codec driver from further accessing the modem */
254 cx20442->tty = NULL;
255 component->card->pop_time = 0;
256 }
257
258 /* Line discipline .hangup() */
v253_hangup(struct tty_struct * tty)259 static int v253_hangup(struct tty_struct *tty)
260 {
261 v253_close(tty);
262 return 0;
263 }
264
265 /* Line discipline .receive_buf() */
v253_receive(struct tty_struct * tty,const unsigned char * cp,char * fp,int count)266 static void v253_receive(struct tty_struct *tty,
267 const unsigned char *cp, char *fp, int count)
268 {
269 struct snd_soc_component *component = tty->disc_data;
270 struct cx20442_priv *cx20442;
271
272 if (!component)
273 return;
274
275 cx20442 = snd_soc_component_get_drvdata(component);
276
277 if (!cx20442->tty) {
278 /* First modem response, complete setup procedure */
279
280 /* Set up codec driver access to modem controls */
281 cx20442->tty = tty;
282 component->card->pop_time = 1;
283 }
284 }
285
286 /* Line discipline .write_wakeup() */
v253_wakeup(struct tty_struct * tty)287 static void v253_wakeup(struct tty_struct *tty)
288 {
289 }
290
291 struct tty_ldisc_ops v253_ops = {
292 .magic = TTY_LDISC_MAGIC,
293 .name = "cx20442",
294 .owner = THIS_MODULE,
295 .open = v253_open,
296 .close = v253_close,
297 .hangup = v253_hangup,
298 .receive_buf = v253_receive,
299 .write_wakeup = v253_wakeup,
300 };
301 EXPORT_SYMBOL_GPL(v253_ops);
302
303
304 /*
305 * Codec DAI
306 */
307
308 static struct snd_soc_dai_driver cx20442_dai = {
309 .name = "cx20442-voice",
310 .playback = {
311 .stream_name = "Playback",
312 .channels_min = 1,
313 .channels_max = 1,
314 .rates = SNDRV_PCM_RATE_8000,
315 .formats = SNDRV_PCM_FMTBIT_S16_LE,
316 },
317 .capture = {
318 .stream_name = "Capture",
319 .channels_min = 1,
320 .channels_max = 1,
321 .rates = SNDRV_PCM_RATE_8000,
322 .formats = SNDRV_PCM_FMTBIT_S16_LE,
323 },
324 };
325
cx20442_set_bias_level(struct snd_soc_component * component,enum snd_soc_bias_level level)326 static int cx20442_set_bias_level(struct snd_soc_component *component,
327 enum snd_soc_bias_level level)
328 {
329 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
330 int err = 0;
331
332 switch (level) {
333 case SND_SOC_BIAS_PREPARE:
334 if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY)
335 break;
336 if (IS_ERR(cx20442->por))
337 err = PTR_ERR(cx20442->por);
338 else
339 err = regulator_enable(cx20442->por);
340 break;
341 case SND_SOC_BIAS_STANDBY:
342 if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
343 break;
344 if (IS_ERR(cx20442->por))
345 err = PTR_ERR(cx20442->por);
346 else
347 err = regulator_disable(cx20442->por);
348 break;
349 default:
350 break;
351 }
352
353 return err;
354 }
355
cx20442_component_probe(struct snd_soc_component * component)356 static int cx20442_component_probe(struct snd_soc_component *component)
357 {
358 struct cx20442_priv *cx20442;
359
360 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
361 if (cx20442 == NULL)
362 return -ENOMEM;
363
364 cx20442->por = regulator_get(component->dev, "POR");
365 if (IS_ERR(cx20442->por)) {
366 int err = PTR_ERR(cx20442->por);
367
368 dev_warn(component->dev, "failed to get POR supply (%d)", err);
369 /*
370 * When running on a non-dt platform and requested regulator
371 * is not available, regulator_get() never returns
372 * -EPROBE_DEFER as it is not able to justify if the regulator
373 * may still appear later. On the other hand, the board can
374 * still set full constraints flag at late_initcall in order
375 * to instruct regulator_get() to return a dummy one if
376 * sufficient. Hence, if we get -ENODEV here, let's convert
377 * it to -EPROBE_DEFER and wait for the board to decide or
378 * let Deferred Probe infrastructure handle this error.
379 */
380 if (err == -ENODEV)
381 err = -EPROBE_DEFER;
382 kfree(cx20442);
383 return err;
384 }
385
386 cx20442->tty = NULL;
387
388 snd_soc_component_set_drvdata(component, cx20442);
389 component->card->pop_time = 0;
390
391 return 0;
392 }
393
394 /* power down chip */
cx20442_component_remove(struct snd_soc_component * component)395 static void cx20442_component_remove(struct snd_soc_component *component)
396 {
397 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
398
399 if (cx20442->tty) {
400 struct tty_struct *tty = cx20442->tty;
401 tty_hangup(tty);
402 }
403
404 if (!IS_ERR(cx20442->por)) {
405 /* should be already in STANDBY, hence disabled */
406 regulator_put(cx20442->por);
407 }
408
409 snd_soc_component_set_drvdata(component, NULL);
410 kfree(cx20442);
411 }
412
413 static const struct snd_soc_component_driver cx20442_component_dev = {
414 .probe = cx20442_component_probe,
415 .remove = cx20442_component_remove,
416 .set_bias_level = cx20442_set_bias_level,
417 .read = cx20442_read_reg_cache,
418 .write = cx20442_write,
419 .dapm_widgets = cx20442_dapm_widgets,
420 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
421 .dapm_routes = cx20442_audio_map,
422 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
423 .idle_bias_on = 1,
424 .use_pmdown_time = 1,
425 .endianness = 1,
426 .non_legacy_dai_naming = 1,
427 };
428
cx20442_platform_probe(struct platform_device * pdev)429 static int cx20442_platform_probe(struct platform_device *pdev)
430 {
431 return devm_snd_soc_register_component(&pdev->dev,
432 &cx20442_component_dev, &cx20442_dai, 1);
433 }
434
435 static struct platform_driver cx20442_platform_driver = {
436 .driver = {
437 .name = "cx20442-codec",
438 },
439 .probe = cx20442_platform_probe,
440 };
441
442 module_platform_driver(cx20442_platform_driver);
443
444 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
445 MODULE_AUTHOR("Janusz Krzysztofik");
446 MODULE_LICENSE("GPL");
447 MODULE_ALIAS("platform:cx20442-codec");
448
