1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
4 //
5 // Copyright (C) 2016 Axentia Technologies AB
6 //
7 // Author: Peter Rosin <peda@axentia.se>
8 //
9 // loop1 relays
10 // IN1 +---o +------------+ o---+ OUT1
11 // \ /
12 // + +
13 // | / |
14 // +--o +--. |
15 // | add | |
16 // | V |
17 // | .---. |
18 // DAC +----------->|Sum|---+
19 // | '---' |
20 // | |
21 // + +
22 //
23 // IN2 +---o--+------------+--o---+ OUT2
24 // loop2 relays
25 //
26 // The 'loop1' gpio pin controls two relays, which are either in loop
27 // position, meaning that input and output are directly connected, or
28 // they are in mixer position, meaning that the signal is passed through
29 // the 'Sum' mixer. Similarly for 'loop2'.
30 //
31 // In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
32 // mixer (if 'add' is active) and feeding the mixer output to OUT1. The
33 // 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
34 // IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
35 // of the (filtered) output from the PCM5142 codec.
36
37 #include <linux/clk.h>
38 #include <linux/gpio/consumer.h>
39 #include <linux/module.h>
40 #include <linux/of.h>
41 #include <linux/regulator/consumer.h>
42
43 #include <sound/soc.h>
44 #include <sound/pcm_params.h>
45
46 struct tse850_priv {
47 struct gpio_desc *add;
48 struct gpio_desc *loop1;
49 struct gpio_desc *loop2;
50
51 struct regulator *ana;
52
53 int add_cache;
54 int loop1_cache;
55 int loop2_cache;
56 };
57
tse850_get_mux1(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)58 static int tse850_get_mux1(struct snd_kcontrol *kctrl,
59 struct snd_ctl_elem_value *ucontrol)
60 {
61 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
62 struct snd_soc_card *card = dapm->card;
63 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
64
65 ucontrol->value.enumerated.item[0] = tse850->loop1_cache;
66
67 return 0;
68 }
69
tse850_put_mux1(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)70 static int tse850_put_mux1(struct snd_kcontrol *kctrl,
71 struct snd_ctl_elem_value *ucontrol)
72 {
73 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
74 struct snd_soc_card *card = dapm->card;
75 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
76 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
77 unsigned int val = ucontrol->value.enumerated.item[0];
78
79 if (val >= e->items)
80 return -EINVAL;
81
82 gpiod_set_value_cansleep(tse850->loop1, val);
83 tse850->loop1_cache = val;
84
85 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
86 }
87
tse850_get_mux2(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)88 static int tse850_get_mux2(struct snd_kcontrol *kctrl,
89 struct snd_ctl_elem_value *ucontrol)
90 {
91 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
92 struct snd_soc_card *card = dapm->card;
93 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
94
95 ucontrol->value.enumerated.item[0] = tse850->loop2_cache;
96
97 return 0;
98 }
99
tse850_put_mux2(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)100 static int tse850_put_mux2(struct snd_kcontrol *kctrl,
101 struct snd_ctl_elem_value *ucontrol)
102 {
103 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
104 struct snd_soc_card *card = dapm->card;
105 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
106 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
107 unsigned int val = ucontrol->value.enumerated.item[0];
108
109 if (val >= e->items)
110 return -EINVAL;
111
112 gpiod_set_value_cansleep(tse850->loop2, val);
113 tse850->loop2_cache = val;
114
115 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
116 }
117
tse850_get_mix(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)118 static int tse850_get_mix(struct snd_kcontrol *kctrl,
119 struct snd_ctl_elem_value *ucontrol)
120 {
121 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
122 struct snd_soc_card *card = dapm->card;
123 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
124
125 ucontrol->value.enumerated.item[0] = tse850->add_cache;
126
127 return 0;
128 }
129
tse850_put_mix(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)130 static int tse850_put_mix(struct snd_kcontrol *kctrl,
131 struct snd_ctl_elem_value *ucontrol)
132 {
133 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
134 struct snd_soc_card *card = dapm->card;
135 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
136 int connect = !!ucontrol->value.integer.value[0];
137
138 if (tse850->add_cache == connect)
139 return 0;
140
141 /*
142 * Hmmm, this gpiod_set_value_cansleep call should probably happen
143 * inside snd_soc_dapm_mixer_update_power in the loop.
144 */
145 gpiod_set_value_cansleep(tse850->add, connect);
146 tse850->add_cache = connect;
147
148 snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
149 return 1;
150 }
151
tse850_get_ana(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)152 static int tse850_get_ana(struct snd_kcontrol *kctrl,
153 struct snd_ctl_elem_value *ucontrol)
154 {
155 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
156 struct snd_soc_card *card = dapm->card;
157 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
158 int ret;
159
160 ret = regulator_get_voltage(tse850->ana);
161 if (ret < 0)
162 return ret;
163
164 /*
165 * Map regulator output values like so:
166 * -11.5V to "Low" (enum 0)
167 * 11.5V-12.5V to "12V" (enum 1)
168 * 12.5V-13.5V to "13V" (enum 2)
169 * ...
170 * 18.5V-19.5V to "19V" (enum 8)
171 * 19.5V- to "20V" (enum 9)
172 */
173 if (ret < 11000000)
174 ret = 11000000;
175 else if (ret > 20000000)
176 ret = 20000000;
177 ret -= 11000000;
178 ret = (ret + 500000) / 1000000;
179
180 ucontrol->value.enumerated.item[0] = ret;
181
182 return 0;
183 }
184
tse850_put_ana(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)185 static int tse850_put_ana(struct snd_kcontrol *kctrl,
186 struct snd_ctl_elem_value *ucontrol)
187 {
188 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
189 struct snd_soc_card *card = dapm->card;
190 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
191 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
192 unsigned int uV = ucontrol->value.enumerated.item[0];
193 int ret;
194
195 if (uV >= e->items)
196 return -EINVAL;
197
198 /*
199 * Map enum zero (Low) to 2 volts on the regulator, do this since
200 * the ana regulator is supplied by the system 12V voltage and
201 * requesting anything below the system voltage causes the system
202 * voltage to be passed through the regulator. Also, the ana
203 * regulator induces noise when requesting voltages near the
204 * system voltage. So, by mapping Low to 2V, that noise is
205 * eliminated when all that is needed is 12V (the system voltage).
206 */
207 if (uV)
208 uV = 11000000 + (1000000 * uV);
209 else
210 uV = 2000000;
211
212 ret = regulator_set_voltage(tse850->ana, uV, uV);
213 if (ret < 0)
214 return ret;
215
216 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
217 }
218
219 static const char * const mux_text[] = { "Mixer", "Loop" };
220
221 static const struct soc_enum mux_enum =
222 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);
223
224 static const struct snd_kcontrol_new mux1 =
225 SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);
226
227 static const struct snd_kcontrol_new mux2 =
228 SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);
229
230 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
231 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
232 .info = snd_soc_info_volsw, \
233 .get = xget, \
234 .put = xput, \
235 .private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
236
237 static const struct snd_kcontrol_new mix[] = {
238 TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
239 tse850_get_mix, tse850_put_mix),
240 };
241
242 static const char * const ana_text[] = {
243 "Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
244 };
245
246 static const struct soc_enum ana_enum =
247 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);
248
249 static const struct snd_kcontrol_new out =
250 SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);
251
252 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
253 SND_SOC_DAPM_LINE("OUT1", NULL),
254 SND_SOC_DAPM_LINE("OUT2", NULL),
255 SND_SOC_DAPM_LINE("IN1", NULL),
256 SND_SOC_DAPM_LINE("IN2", NULL),
257 SND_SOC_DAPM_INPUT("DAC"),
258 SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
259 SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
260 SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
261 SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
262 SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
263 SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
264 };
265
266 /*
267 * These connections are not entirely correct, since both IN1 and IN2
268 * are always fed to MIX (if the "IN switch" is set so), i.e. without
269 * regard to the loop1 and loop2 relays that according to this only
270 * control MUX1 and MUX2 but in fact also control how the input signals
271 * are routed.
272 * But, 1) I don't know how to do it right, and 2) it doesn't seem to
273 * matter in practice since nothing is powered in those sections anyway.
274 */
275 static const struct snd_soc_dapm_route tse850_intercon[] = {
276 { "OUT1", NULL, "MUX1" },
277 { "OUT2", NULL, "MUX2" },
278
279 { "MUX1", "Loop", "IN1" },
280 { "MUX1", "Mixer", "OUT" },
281
282 { "MUX2", "Loop", "IN2" },
283 { "MUX2", "Mixer", "OUT" },
284
285 { "OUT", NULL, "MIX" },
286
287 { "MIX", NULL, "DAC" },
288 { "MIX", "IN Switch", "IN1" },
289 { "MIX", "IN Switch", "IN2" },
290
291 /* connect board input to the codec left channel output pin */
292 { "DAC", NULL, "OUTL" },
293 };
294
295 SND_SOC_DAILINK_DEFS(pcm,
296 DAILINK_COMP_ARRAY(COMP_EMPTY()),
297 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")),
298 DAILINK_COMP_ARRAY(COMP_EMPTY()));
299
300 static struct snd_soc_dai_link tse850_dailink = {
301 .name = "TSE-850",
302 .stream_name = "TSE-850-PCM",
303 .dai_fmt = SND_SOC_DAIFMT_I2S
304 | SND_SOC_DAIFMT_NB_NF
305 | SND_SOC_DAIFMT_CBP_CFC,
306 SND_SOC_DAILINK_REG(pcm),
307 };
308
309 static struct snd_soc_card tse850_card = {
310 .name = "TSE-850-ASoC",
311 .owner = THIS_MODULE,
312 .dai_link = &tse850_dailink,
313 .num_links = 1,
314 .dapm_widgets = tse850_dapm_widgets,
315 .num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
316 .dapm_routes = tse850_intercon,
317 .num_dapm_routes = ARRAY_SIZE(tse850_intercon),
318 .fully_routed = true,
319 };
320
tse850_dt_init(struct platform_device * pdev)321 static int tse850_dt_init(struct platform_device *pdev)
322 {
323 struct device_node *np = pdev->dev.of_node;
324 struct device_node *codec_np, *cpu_np;
325 struct snd_soc_dai_link *dailink = &tse850_dailink;
326
327 if (!np) {
328 dev_err(&pdev->dev, "only device tree supported\n");
329 return -EINVAL;
330 }
331
332 cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
333 if (!cpu_np) {
334 dev_err(&pdev->dev, "failed to get cpu dai\n");
335 return -EINVAL;
336 }
337 dailink->cpus->of_node = cpu_np;
338 dailink->platforms->of_node = cpu_np;
339 of_node_put(cpu_np);
340
341 codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
342 if (!codec_np) {
343 dev_err(&pdev->dev, "failed to get codec info\n");
344 return -EINVAL;
345 }
346 dailink->codecs->of_node = codec_np;
347 of_node_put(codec_np);
348
349 return 0;
350 }
351
tse850_probe(struct platform_device * pdev)352 static int tse850_probe(struct platform_device *pdev)
353 {
354 struct snd_soc_card *card = &tse850_card;
355 struct device *dev = card->dev = &pdev->dev;
356 struct tse850_priv *tse850;
357 int ret;
358
359 tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
360 if (!tse850)
361 return -ENOMEM;
362
363 snd_soc_card_set_drvdata(card, tse850);
364
365 ret = tse850_dt_init(pdev);
366 if (ret) {
367 dev_err(dev, "failed to init dt info\n");
368 return ret;
369 }
370
371 tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
372 if (IS_ERR(tse850->add))
373 return dev_err_probe(dev, PTR_ERR(tse850->add),
374 "failed to get 'add' gpio\n");
375 tse850->add_cache = 1;
376
377 tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
378 if (IS_ERR(tse850->loop1))
379 return dev_err_probe(dev, PTR_ERR(tse850->loop1),
380 "failed to get 'loop1' gpio\n");
381 tse850->loop1_cache = 1;
382
383 tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
384 if (IS_ERR(tse850->loop2))
385 return dev_err_probe(dev, PTR_ERR(tse850->loop2),
386 "failed to get 'loop2' gpio\n");
387 tse850->loop2_cache = 1;
388
389 tse850->ana = devm_regulator_get(dev, "axentia,ana");
390 if (IS_ERR(tse850->ana))
391 return dev_err_probe(dev, PTR_ERR(tse850->ana),
392 "failed to get 'ana' regulator\n");
393
394 ret = regulator_enable(tse850->ana);
395 if (ret < 0) {
396 dev_err(dev, "failed to enable the 'ana' regulator\n");
397 return ret;
398 }
399
400 ret = snd_soc_register_card(card);
401 if (ret) {
402 dev_err(dev, "snd_soc_register_card failed\n");
403 goto err_disable_ana;
404 }
405
406 return 0;
407
408 err_disable_ana:
409 regulator_disable(tse850->ana);
410 return ret;
411 }
412
tse850_remove(struct platform_device * pdev)413 static void tse850_remove(struct platform_device *pdev)
414 {
415 struct snd_soc_card *card = platform_get_drvdata(pdev);
416 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
417
418 snd_soc_unregister_card(card);
419 regulator_disable(tse850->ana);
420 }
421
422 static const struct of_device_id tse850_dt_ids[] = {
423 { .compatible = "axentia,tse850-pcm5142", },
424 { /* sentinel */ }
425 };
426 MODULE_DEVICE_TABLE(of, tse850_dt_ids);
427
428 static struct platform_driver tse850_driver = {
429 .driver = {
430 .name = "axentia-tse850-pcm5142",
431 .of_match_table = tse850_dt_ids,
432 },
433 .probe = tse850_probe,
434 .remove = tse850_remove,
435 };
436
437 module_platform_driver(tse850_driver);
438
439 /* Module information */
440 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
441 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
442 MODULE_LICENSE("GPL v2");
443