1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * cx20442.c -- CX20442 ALSA Soc Audio driver
4 *
5 * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
6 *
7 * Initially based on sound/soc/codecs/wm8400.c
8 * Copyright 2008, 2009 Wolfson Microelectronics PLC.
9 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
10 */
11
12 #include <linux/tty.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/regulator/consumer.h>
16
17 #include <sound/core.h>
18 #include <sound/initval.h>
19 #include <sound/soc.h>
20
21 #include "cx20442.h"
22
23
24 struct cx20442_priv {
25 struct tty_struct *tty;
26 struct regulator *por;
27 u8 reg_cache;
28 };
29
30 #define CX20442_PM 0x0
31
32 #define CX20442_TELIN 0
33 #define CX20442_TELOUT 1
34 #define CX20442_MIC 2
35 #define CX20442_SPKOUT 3
36 #define CX20442_AGC 4
37
38 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
39 SND_SOC_DAPM_OUTPUT("TELOUT"),
40 SND_SOC_DAPM_OUTPUT("SPKOUT"),
41 SND_SOC_DAPM_OUTPUT("AGCOUT"),
42
43 SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
44
45 SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
46 SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
47 SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
48
49 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
50 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
51
52 SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
53
54 SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
55 SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
56
57 SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
58
59 SND_SOC_DAPM_INPUT("TELIN"),
60 SND_SOC_DAPM_INPUT("MIC"),
61 SND_SOC_DAPM_INPUT("AGCIN"),
62 };
63
64 static const struct snd_soc_dapm_route cx20442_audio_map[] = {
65 {"TELOUT", NULL, "TELOUT Amp"},
66
67 {"SPKOUT", NULL, "SPKOUT Mixer"},
68 {"SPKOUT Mixer", NULL, "SPKOUT Amp"},
69
70 {"TELOUT Amp", NULL, "DAC"},
71 {"SPKOUT Amp", NULL, "DAC"},
72
73 {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
74 {"SPKOUT AGC", NULL, "AGCIN"},
75
76 {"AGCOUT", NULL, "MIC AGC"},
77 {"MIC AGC", NULL, "MIC"},
78
79 {"MIC Bias", NULL, "MIC"},
80 {"Input Mixer", NULL, "MIC Bias"},
81
82 {"TELIN Bias", NULL, "TELIN"},
83 {"Input Mixer", NULL, "TELIN Bias"},
84
85 {"ADC", NULL, "Input Mixer"},
86 };
87
cx20442_read_reg_cache(struct snd_soc_component * component,unsigned int reg)88 static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component,
89 unsigned int reg)
90 {
91 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
92
93 if (reg >= 1)
94 return -EINVAL;
95
96 return cx20442->reg_cache;
97 }
98
99 enum v253_vls {
100 V253_VLS_NONE = 0,
101 V253_VLS_T,
102 V253_VLS_L,
103 V253_VLS_LT,
104 V253_VLS_S,
105 V253_VLS_ST,
106 V253_VLS_M,
107 V253_VLS_MST,
108 V253_VLS_S1,
109 V253_VLS_S1T,
110 V253_VLS_MS1T,
111 V253_VLS_M1,
112 V253_VLS_M1ST,
113 V253_VLS_M1S1T,
114 V253_VLS_H,
115 V253_VLS_HT,
116 V253_VLS_MS,
117 V253_VLS_MS1,
118 V253_VLS_M1S,
119 V253_VLS_M1S1,
120 V253_VLS_TEST,
121 };
122
cx20442_pm_to_v253_vls(u8 value)123 static int cx20442_pm_to_v253_vls(u8 value)
124 {
125 switch (value & ~(1 << CX20442_AGC)) {
126 case 0:
127 return V253_VLS_T;
128 case (1 << CX20442_SPKOUT):
129 case (1 << CX20442_MIC):
130 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
131 return V253_VLS_M1S1;
132 case (1 << CX20442_TELOUT):
133 case (1 << CX20442_TELIN):
134 case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
135 return V253_VLS_L;
136 case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
137 return V253_VLS_NONE;
138 }
139 return -EINVAL;
140 }
cx20442_pm_to_v253_vsp(u8 value)141 static int cx20442_pm_to_v253_vsp(u8 value)
142 {
143 switch (value & ~(1 << CX20442_AGC)) {
144 case (1 << CX20442_SPKOUT):
145 case (1 << CX20442_MIC):
146 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
147 return (bool)(value & (1 << CX20442_AGC));
148 }
149 return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
150 }
151
cx20442_write(struct snd_soc_component * component,unsigned int reg,unsigned int value)152 static int cx20442_write(struct snd_soc_component *component, unsigned int reg,
153 unsigned int value)
154 {
155 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
156 int vls, vsp, old, len;
157 char buf[18];
158
159 if (reg >= 1)
160 return -EINVAL;
161
162 /* tty and write pointers required for talking to the modem
163 * are expected to be set by the line discipline initialization code */
164 if (!cx20442->tty || !cx20442->tty->ops->write)
165 return -EIO;
166
167 old = cx20442->reg_cache;
168 cx20442->reg_cache = value;
169
170 vls = cx20442_pm_to_v253_vls(value);
171 if (vls < 0)
172 return vls;
173
174 vsp = cx20442_pm_to_v253_vsp(value);
175 if (vsp < 0)
176 return vsp;
177
178 if ((vls == V253_VLS_T) ||
179 (vls == cx20442_pm_to_v253_vls(old))) {
180 if (vsp == cx20442_pm_to_v253_vsp(old))
181 return 0;
182 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
183 } else if (vsp == cx20442_pm_to_v253_vsp(old))
184 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
185 else
186 len = snprintf(buf, ARRAY_SIZE(buf),
187 "at+vls=%d;+vsp=%d\r", vls, vsp);
188
189 if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
190 return -ENOMEM;
191
192 dev_dbg(component->dev, "%s: %s\n", __func__, buf);
193 if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
194 return -EIO;
195
196 return 0;
197 }
198
199 /*
200 * Line discpline related code
201 *
202 * Any of the callback functions below can be used in two ways:
203 * 1) registerd by a machine driver as one of line discipline operations,
204 * 2) called from a machine's provided line discipline callback function
205 * in case when extra machine specific code must be run as well.
206 */
207
208 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
209 static const char v253_init[] = "ate0m0q0+fclass=8\r";
210
211 /* Line discipline .open() */
v253_open(struct tty_struct * tty)212 static int v253_open(struct tty_struct *tty)
213 {
214 int ret, len = strlen(v253_init);
215
216 /* Doesn't make sense without write callback */
217 if (!tty->ops->write)
218 return -EINVAL;
219
220 /* Won't work if no codec pointer has been passed by a card driver */
221 if (!tty->disc_data)
222 return -ENODEV;
223
224 tty->receive_room = 16;
225 if (tty->ops->write(tty, v253_init, len) != len) {
226 ret = -EIO;
227 goto err;
228 }
229 /* Actual setup will be performed after the modem responds. */
230 return 0;
231 err:
232 tty->disc_data = NULL;
233 return ret;
234 }
235
236 /* Line discipline .close() */
v253_close(struct tty_struct * tty)237 static void v253_close(struct tty_struct *tty)
238 {
239 struct snd_soc_component *component = tty->disc_data;
240 struct cx20442_priv *cx20442;
241
242 tty->disc_data = NULL;
243
244 if (!component)
245 return;
246
247 cx20442 = snd_soc_component_get_drvdata(component);
248
249 /* Prevent the codec driver from further accessing the modem */
250 cx20442->tty = NULL;
251 component->card->pop_time = 0;
252 }
253
254 /* Line discipline .hangup() */
v253_hangup(struct tty_struct * tty)255 static void v253_hangup(struct tty_struct *tty)
256 {
257 v253_close(tty);
258 }
259
260 /* Line discipline .receive_buf() */
v253_receive(struct tty_struct * tty,const unsigned char * cp,const char * fp,int count)261 static void v253_receive(struct tty_struct *tty, const unsigned char *cp,
262 const char *fp, int count)
263 {
264 struct snd_soc_component *component = tty->disc_data;
265 struct cx20442_priv *cx20442;
266
267 if (!component)
268 return;
269
270 cx20442 = snd_soc_component_get_drvdata(component);
271
272 if (!cx20442->tty) {
273 /* First modem response, complete setup procedure */
274
275 /* Set up codec driver access to modem controls */
276 cx20442->tty = tty;
277 component->card->pop_time = 1;
278 }
279 }
280
281 struct tty_ldisc_ops v253_ops = {
282 .name = "cx20442",
283 .owner = THIS_MODULE,
284 .open = v253_open,
285 .close = v253_close,
286 .hangup = v253_hangup,
287 .receive_buf = v253_receive,
288 };
289 EXPORT_SYMBOL_GPL(v253_ops);
290
291
292 /*
293 * Codec DAI
294 */
295
296 static struct snd_soc_dai_driver cx20442_dai = {
297 .name = "cx20442-voice",
298 .playback = {
299 .stream_name = "Playback",
300 .channels_min = 1,
301 .channels_max = 1,
302 .rates = SNDRV_PCM_RATE_8000,
303 .formats = SNDRV_PCM_FMTBIT_S16_LE,
304 },
305 .capture = {
306 .stream_name = "Capture",
307 .channels_min = 1,
308 .channels_max = 1,
309 .rates = SNDRV_PCM_RATE_8000,
310 .formats = SNDRV_PCM_FMTBIT_S16_LE,
311 },
312 };
313
cx20442_set_bias_level(struct snd_soc_component * component,enum snd_soc_bias_level level)314 static int cx20442_set_bias_level(struct snd_soc_component *component,
315 enum snd_soc_bias_level level)
316 {
317 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
318 int err = 0;
319
320 switch (level) {
321 case SND_SOC_BIAS_PREPARE:
322 if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY)
323 break;
324 if (IS_ERR(cx20442->por))
325 err = PTR_ERR(cx20442->por);
326 else
327 err = regulator_enable(cx20442->por);
328 break;
329 case SND_SOC_BIAS_STANDBY:
330 if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
331 break;
332 if (IS_ERR(cx20442->por))
333 err = PTR_ERR(cx20442->por);
334 else
335 err = regulator_disable(cx20442->por);
336 break;
337 default:
338 break;
339 }
340
341 return err;
342 }
343
cx20442_component_probe(struct snd_soc_component * component)344 static int cx20442_component_probe(struct snd_soc_component *component)
345 {
346 struct cx20442_priv *cx20442;
347
348 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
349 if (cx20442 == NULL)
350 return -ENOMEM;
351
352 cx20442->por = regulator_get(component->dev, "POR");
353 if (IS_ERR(cx20442->por)) {
354 int err = PTR_ERR(cx20442->por);
355
356 dev_warn(component->dev, "failed to get POR supply (%d)", err);
357 /*
358 * When running on a non-dt platform and requested regulator
359 * is not available, regulator_get() never returns
360 * -EPROBE_DEFER as it is not able to justify if the regulator
361 * may still appear later. On the other hand, the board can
362 * still set full constraints flag at late_initcall in order
363 * to instruct regulator_get() to return a dummy one if
364 * sufficient. Hence, if we get -ENODEV here, let's convert
365 * it to -EPROBE_DEFER and wait for the board to decide or
366 * let Deferred Probe infrastructure handle this error.
367 */
368 if (err == -ENODEV)
369 err = -EPROBE_DEFER;
370 kfree(cx20442);
371 return err;
372 }
373
374 cx20442->tty = NULL;
375
376 snd_soc_component_set_drvdata(component, cx20442);
377 component->card->pop_time = 0;
378
379 return 0;
380 }
381
382 /* power down chip */
cx20442_component_remove(struct snd_soc_component * component)383 static void cx20442_component_remove(struct snd_soc_component *component)
384 {
385 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
386
387 if (cx20442->tty) {
388 struct tty_struct *tty = cx20442->tty;
389 tty_hangup(tty);
390 }
391
392 if (!IS_ERR(cx20442->por)) {
393 /* should be already in STANDBY, hence disabled */
394 regulator_put(cx20442->por);
395 }
396
397 snd_soc_component_set_drvdata(component, NULL);
398 kfree(cx20442);
399 }
400
401 static const struct snd_soc_component_driver cx20442_component_dev = {
402 .probe = cx20442_component_probe,
403 .remove = cx20442_component_remove,
404 .set_bias_level = cx20442_set_bias_level,
405 .read = cx20442_read_reg_cache,
406 .write = cx20442_write,
407 .dapm_widgets = cx20442_dapm_widgets,
408 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
409 .dapm_routes = cx20442_audio_map,
410 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
411 .idle_bias_on = 1,
412 .use_pmdown_time = 1,
413 .endianness = 1,
414 };
415
cx20442_platform_probe(struct platform_device * pdev)416 static int cx20442_platform_probe(struct platform_device *pdev)
417 {
418 return devm_snd_soc_register_component(&pdev->dev,
419 &cx20442_component_dev, &cx20442_dai, 1);
420 }
421
422 static struct platform_driver cx20442_platform_driver = {
423 .driver = {
424 .name = "cx20442-codec",
425 },
426 .probe = cx20442_platform_probe,
427 };
428
429 module_platform_driver(cx20442_platform_driver);
430
431 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
432 MODULE_AUTHOR("Janusz Krzysztofik");
433 MODULE_LICENSE("GPL");
434 MODULE_ALIAS("platform:cx20442-codec");
435
