1 /*
2 * TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
3 *
4 * Copyright (C) 2016 Axentia Technologies AB
5 *
6 * Author: Peter Rosin <peda@axentia.se>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 /*
14 * loop1 relays
15 * IN1 +---o +------------+ o---+ OUT1
16 * \ /
17 * + +
18 * | / |
19 * +--o +--. |
20 * | add | |
21 * | V |
22 * | .---. |
23 * DAC +----------->|Sum|---+
24 * | '---' |
25 * | |
26 * + +
27 *
28 * IN2 +---o--+------------+--o---+ OUT2
29 * loop2 relays
30 *
31 * The 'loop1' gpio pin controlls two relays, which are either in loop
32 * position, meaning that input and output are directly connected, or
33 * they are in mixer position, meaning that the signal is passed through
34 * the 'Sum' mixer. Similarly for 'loop2'.
35 *
36 * In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
37 * mixer (if 'add' is active) and feeding the mixer output to OUT1. The
38 * 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
39 * IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
40 * of the (filtered) output from the PCM5142 codec.
41 */
42
43 #include <linux/clk.h>
44 #include <linux/gpio.h>
45 #include <linux/module.h>
46 #include <linux/of.h>
47 #include <linux/of_device.h>
48 #include <linux/of_gpio.h>
49 #include <linux/regulator/consumer.h>
50
51 #include <sound/soc.h>
52 #include <sound/pcm_params.h>
53
54 struct tse850_priv {
55 struct gpio_desc *add;
56 struct gpio_desc *loop1;
57 struct gpio_desc *loop2;
58
59 struct regulator *ana;
60
61 int add_cache;
62 int loop1_cache;
63 int loop2_cache;
64 };
65
tse850_get_mux1(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)66 static int tse850_get_mux1(struct snd_kcontrol *kctrl,
67 struct snd_ctl_elem_value *ucontrol)
68 {
69 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
70 struct snd_soc_card *card = dapm->card;
71 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
72
73 ucontrol->value.enumerated.item[0] = tse850->loop1_cache;
74
75 return 0;
76 }
77
tse850_put_mux1(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)78 static int tse850_put_mux1(struct snd_kcontrol *kctrl,
79 struct snd_ctl_elem_value *ucontrol)
80 {
81 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
82 struct snd_soc_card *card = dapm->card;
83 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
84 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
85 unsigned int val = ucontrol->value.enumerated.item[0];
86
87 if (val >= e->items)
88 return -EINVAL;
89
90 gpiod_set_value_cansleep(tse850->loop1, val);
91 tse850->loop1_cache = val;
92
93 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
94 }
95
tse850_get_mux2(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)96 static int tse850_get_mux2(struct snd_kcontrol *kctrl,
97 struct snd_ctl_elem_value *ucontrol)
98 {
99 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
100 struct snd_soc_card *card = dapm->card;
101 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
102
103 ucontrol->value.enumerated.item[0] = tse850->loop2_cache;
104
105 return 0;
106 }
107
tse850_put_mux2(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)108 static int tse850_put_mux2(struct snd_kcontrol *kctrl,
109 struct snd_ctl_elem_value *ucontrol)
110 {
111 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
112 struct snd_soc_card *card = dapm->card;
113 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
114 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
115 unsigned int val = ucontrol->value.enumerated.item[0];
116
117 if (val >= e->items)
118 return -EINVAL;
119
120 gpiod_set_value_cansleep(tse850->loop2, val);
121 tse850->loop2_cache = val;
122
123 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
124 }
125
tse850_get_mix(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)126 int tse850_get_mix(struct snd_kcontrol *kctrl,
127 struct snd_ctl_elem_value *ucontrol)
128 {
129 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
130 struct snd_soc_card *card = dapm->card;
131 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
132
133 ucontrol->value.enumerated.item[0] = tse850->add_cache;
134
135 return 0;
136 }
137
tse850_put_mix(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)138 int tse850_put_mix(struct snd_kcontrol *kctrl,
139 struct snd_ctl_elem_value *ucontrol)
140 {
141 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
142 struct snd_soc_card *card = dapm->card;
143 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
144 int connect = !!ucontrol->value.integer.value[0];
145
146 if (tse850->add_cache == connect)
147 return 0;
148
149 /*
150 * Hmmm, this gpiod_set_value_cansleep call should probably happen
151 * inside snd_soc_dapm_mixer_update_power in the loop.
152 */
153 gpiod_set_value_cansleep(tse850->add, connect);
154 tse850->add_cache = connect;
155
156 snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
157 return 1;
158 }
159
tse850_get_ana(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)160 int tse850_get_ana(struct snd_kcontrol *kctrl,
161 struct snd_ctl_elem_value *ucontrol)
162 {
163 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
164 struct snd_soc_card *card = dapm->card;
165 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
166 int ret;
167
168 ret = regulator_get_voltage(tse850->ana);
169 if (ret < 0)
170 return ret;
171
172 /*
173 * Map regulator output values like so:
174 * -11.5V to "Low" (enum 0)
175 * 11.5V-12.5V to "12V" (enum 1)
176 * 12.5V-13.5V to "13V" (enum 2)
177 * ...
178 * 18.5V-19.5V to "19V" (enum 8)
179 * 19.5V- to "20V" (enum 9)
180 */
181 if (ret < 11000000)
182 ret = 11000000;
183 else if (ret > 20000000)
184 ret = 20000000;
185 ret -= 11000000;
186 ret = (ret + 500000) / 1000000;
187
188 ucontrol->value.enumerated.item[0] = ret;
189
190 return 0;
191 }
192
tse850_put_ana(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)193 int tse850_put_ana(struct snd_kcontrol *kctrl,
194 struct snd_ctl_elem_value *ucontrol)
195 {
196 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
197 struct snd_soc_card *card = dapm->card;
198 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
199 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
200 unsigned int uV = ucontrol->value.enumerated.item[0];
201 int ret;
202
203 if (uV >= e->items)
204 return -EINVAL;
205
206 /*
207 * Map enum zero (Low) to 2 volts on the regulator, do this since
208 * the ana regulator is supplied by the system 12V voltage and
209 * requesting anything below the system voltage causes the system
210 * voltage to be passed through the regulator. Also, the ana
211 * regulator induces noise when requesting voltages near the
212 * system voltage. So, by mapping Low to 2V, that noise is
213 * eliminated when all that is needed is 12V (the system voltage).
214 */
215 if (uV)
216 uV = 11000000 + (1000000 * uV);
217 else
218 uV = 2000000;
219
220 ret = regulator_set_voltage(tse850->ana, uV, uV);
221 if (ret < 0)
222 return ret;
223
224 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
225 }
226
227 static const char * const mux_text[] = { "Mixer", "Loop" };
228
229 static const struct soc_enum mux_enum =
230 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);
231
232 static const struct snd_kcontrol_new mux1 =
233 SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);
234
235 static const struct snd_kcontrol_new mux2 =
236 SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);
237
238 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
239 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
240 .info = snd_soc_info_volsw, \
241 .get = xget, \
242 .put = xput, \
243 .private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
244
245 static const struct snd_kcontrol_new mix[] = {
246 TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
247 tse850_get_mix, tse850_put_mix),
248 };
249
250 static const char * const ana_text[] = {
251 "Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
252 };
253
254 static const struct soc_enum ana_enum =
255 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);
256
257 static const struct snd_kcontrol_new out =
258 SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);
259
260 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
261 SND_SOC_DAPM_LINE("OUT1", NULL),
262 SND_SOC_DAPM_LINE("OUT2", NULL),
263 SND_SOC_DAPM_LINE("IN1", NULL),
264 SND_SOC_DAPM_LINE("IN2", NULL),
265 SND_SOC_DAPM_INPUT("DAC"),
266 SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
267 SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
268 SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
269 SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
270 SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
271 SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
272 };
273
274 /*
275 * These connections are not entirely correct, since both IN1 and IN2
276 * are always fed to MIX (if the "IN switch" is set so), i.e. without
277 * regard to the loop1 and loop2 relays that according to this only
278 * control MUX1 and MUX2 but in fact also control how the input signals
279 * are routed.
280 * But, 1) I don't know how to do it right, and 2) it doesn't seem to
281 * matter in practice since nothing is powered in those sections anyway.
282 */
283 static const struct snd_soc_dapm_route tse850_intercon[] = {
284 { "OUT1", NULL, "MUX1" },
285 { "OUT2", NULL, "MUX2" },
286
287 { "MUX1", "Loop", "IN1" },
288 { "MUX1", "Mixer", "OUT" },
289
290 { "MUX2", "Loop", "IN2" },
291 { "MUX2", "Mixer", "OUT" },
292
293 { "OUT", NULL, "MIX" },
294
295 { "MIX", NULL, "DAC" },
296 { "MIX", "IN Switch", "IN1" },
297 { "MIX", "IN Switch", "IN2" },
298
299 /* connect board input to the codec left channel output pin */
300 { "DAC", NULL, "OUTL" },
301 };
302
303 static struct snd_soc_dai_link tse850_dailink = {
304 .name = "TSE-850",
305 .stream_name = "TSE-850-PCM",
306 .codec_dai_name = "pcm512x-hifi",
307 .dai_fmt = SND_SOC_DAIFMT_I2S
308 | SND_SOC_DAIFMT_NB_NF
309 | SND_SOC_DAIFMT_CBM_CFS,
310 };
311
312 static struct snd_soc_card tse850_card = {
313 .name = "TSE-850-ASoC",
314 .owner = THIS_MODULE,
315 .dai_link = &tse850_dailink,
316 .num_links = 1,
317 .dapm_widgets = tse850_dapm_widgets,
318 .num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
319 .dapm_routes = tse850_intercon,
320 .num_dapm_routes = ARRAY_SIZE(tse850_intercon),
321 .fully_routed = true,
322 };
323
tse850_dt_init(struct platform_device * pdev)324 static int tse850_dt_init(struct platform_device *pdev)
325 {
326 struct device_node *np = pdev->dev.of_node;
327 struct device_node *codec_np, *cpu_np;
328 struct snd_soc_dai_link *dailink = &tse850_dailink;
329
330 if (!np) {
331 dev_err(&pdev->dev, "only device tree supported\n");
332 return -EINVAL;
333 }
334
335 cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
336 if (!cpu_np) {
337 dev_err(&pdev->dev, "failed to get cpu dai\n");
338 return -EINVAL;
339 }
340 dailink->cpu_of_node = cpu_np;
341 dailink->platform_of_node = cpu_np;
342 of_node_put(cpu_np);
343
344 codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
345 if (!codec_np) {
346 dev_err(&pdev->dev, "failed to get codec info\n");
347 return -EINVAL;
348 }
349 dailink->codec_of_node = codec_np;
350 of_node_put(codec_np);
351
352 return 0;
353 }
354
tse850_probe(struct platform_device * pdev)355 static int tse850_probe(struct platform_device *pdev)
356 {
357 struct snd_soc_card *card = &tse850_card;
358 struct device *dev = card->dev = &pdev->dev;
359 struct tse850_priv *tse850;
360 int ret;
361
362 tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
363 if (!tse850)
364 return -ENOMEM;
365
366 snd_soc_card_set_drvdata(card, tse850);
367
368 ret = tse850_dt_init(pdev);
369 if (ret) {
370 dev_err(dev, "failed to init dt info\n");
371 return ret;
372 }
373
374 tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
375 if (IS_ERR(tse850->add)) {
376 if (PTR_ERR(tse850->add) != -EPROBE_DEFER)
377 dev_err(dev, "failed to get 'add' gpio\n");
378 return PTR_ERR(tse850->add);
379 }
380 tse850->add_cache = 1;
381
382 tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
383 if (IS_ERR(tse850->loop1)) {
384 if (PTR_ERR(tse850->loop1) != -EPROBE_DEFER)
385 dev_err(dev, "failed to get 'loop1' gpio\n");
386 return PTR_ERR(tse850->loop1);
387 }
388 tse850->loop1_cache = 1;
389
390 tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
391 if (IS_ERR(tse850->loop2)) {
392 if (PTR_ERR(tse850->loop2) != -EPROBE_DEFER)
393 dev_err(dev, "failed to get 'loop2' gpio\n");
394 return PTR_ERR(tse850->loop2);
395 }
396 tse850->loop2_cache = 1;
397
398 tse850->ana = devm_regulator_get(dev, "axentia,ana");
399 if (IS_ERR(tse850->ana)) {
400 if (PTR_ERR(tse850->ana) != -EPROBE_DEFER)
401 dev_err(dev, "failed to get 'ana' regulator\n");
402 return PTR_ERR(tse850->ana);
403 }
404
405 ret = regulator_enable(tse850->ana);
406 if (ret < 0) {
407 dev_err(dev, "failed to enable the 'ana' regulator\n");
408 return ret;
409 }
410
411 ret = snd_soc_register_card(card);
412 if (ret) {
413 dev_err(dev, "snd_soc_register_card failed\n");
414 goto err_disable_ana;
415 }
416
417 return 0;
418
419 err_disable_ana:
420 regulator_disable(tse850->ana);
421 return ret;
422 }
423
tse850_remove(struct platform_device * pdev)424 static int tse850_remove(struct platform_device *pdev)
425 {
426 struct snd_soc_card *card = platform_get_drvdata(pdev);
427 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
428
429 snd_soc_unregister_card(card);
430 regulator_disable(tse850->ana);
431
432 return 0;
433 }
434
435 static const struct of_device_id tse850_dt_ids[] = {
436 { .compatible = "axentia,tse850-pcm5142", },
437 { /* sentinel */ }
438 };
439 MODULE_DEVICE_TABLE(of, tse850_dt_ids);
440
441 static struct platform_driver tse850_driver = {
442 .driver = {
443 .name = "axentia-tse850-pcm5142",
444 .of_match_table = of_match_ptr(tse850_dt_ids),
445 },
446 .probe = tse850_probe,
447 .remove = tse850_remove,
448 };
449
450 module_platform_driver(tse850_driver);
451
452 /* Module information */
453 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
454 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
455 MODULE_LICENSE("GPL");
456
