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.h>
39 #include <linux/module.h>
40 #include <linux/of.h>
41 #include <linux/of_gpio.h>
42 #include <linux/regulator/consumer.h>
43
44 #include <sound/soc.h>
45 #include <sound/pcm_params.h>
46
47 struct tse850_priv {
48 struct gpio_desc *add;
49 struct gpio_desc *loop1;
50 struct gpio_desc *loop2;
51
52 struct regulator *ana;
53
54 int add_cache;
55 int loop1_cache;
56 int loop2_cache;
57 };
58
tse850_get_mux1(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)59 static int tse850_get_mux1(struct snd_kcontrol *kctrl,
60 struct snd_ctl_elem_value *ucontrol)
61 {
62 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
63 struct snd_soc_card *card = dapm->card;
64 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
65
66 ucontrol->value.enumerated.item[0] = tse850->loop1_cache;
67
68 return 0;
69 }
70
tse850_put_mux1(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)71 static int tse850_put_mux1(struct snd_kcontrol *kctrl,
72 struct snd_ctl_elem_value *ucontrol)
73 {
74 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
75 struct snd_soc_card *card = dapm->card;
76 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
77 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
78 unsigned int val = ucontrol->value.enumerated.item[0];
79
80 if (val >= e->items)
81 return -EINVAL;
82
83 gpiod_set_value_cansleep(tse850->loop1, val);
84 tse850->loop1_cache = val;
85
86 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
87 }
88
tse850_get_mux2(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)89 static int tse850_get_mux2(struct snd_kcontrol *kctrl,
90 struct snd_ctl_elem_value *ucontrol)
91 {
92 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
93 struct snd_soc_card *card = dapm->card;
94 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
95
96 ucontrol->value.enumerated.item[0] = tse850->loop2_cache;
97
98 return 0;
99 }
100
tse850_put_mux2(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)101 static int tse850_put_mux2(struct snd_kcontrol *kctrl,
102 struct snd_ctl_elem_value *ucontrol)
103 {
104 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
105 struct snd_soc_card *card = dapm->card;
106 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
107 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
108 unsigned int val = ucontrol->value.enumerated.item[0];
109
110 if (val >= e->items)
111 return -EINVAL;
112
113 gpiod_set_value_cansleep(tse850->loop2, val);
114 tse850->loop2_cache = val;
115
116 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
117 }
118
tse850_get_mix(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)119 static int tse850_get_mix(struct snd_kcontrol *kctrl,
120 struct snd_ctl_elem_value *ucontrol)
121 {
122 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
123 struct snd_soc_card *card = dapm->card;
124 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
125
126 ucontrol->value.enumerated.item[0] = tse850->add_cache;
127
128 return 0;
129 }
130
tse850_put_mix(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)131 static int tse850_put_mix(struct snd_kcontrol *kctrl,
132 struct snd_ctl_elem_value *ucontrol)
133 {
134 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
135 struct snd_soc_card *card = dapm->card;
136 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
137 int connect = !!ucontrol->value.integer.value[0];
138
139 if (tse850->add_cache == connect)
140 return 0;
141
142 /*
143 * Hmmm, this gpiod_set_value_cansleep call should probably happen
144 * inside snd_soc_dapm_mixer_update_power in the loop.
145 */
146 gpiod_set_value_cansleep(tse850->add, connect);
147 tse850->add_cache = connect;
148
149 snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
150 return 1;
151 }
152
tse850_get_ana(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)153 static int tse850_get_ana(struct snd_kcontrol *kctrl,
154 struct snd_ctl_elem_value *ucontrol)
155 {
156 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
157 struct snd_soc_card *card = dapm->card;
158 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
159 int ret;
160
161 ret = regulator_get_voltage(tse850->ana);
162 if (ret < 0)
163 return ret;
164
165 /*
166 * Map regulator output values like so:
167 * -11.5V to "Low" (enum 0)
168 * 11.5V-12.5V to "12V" (enum 1)
169 * 12.5V-13.5V to "13V" (enum 2)
170 * ...
171 * 18.5V-19.5V to "19V" (enum 8)
172 * 19.5V- to "20V" (enum 9)
173 */
174 if (ret < 11000000)
175 ret = 11000000;
176 else if (ret > 20000000)
177 ret = 20000000;
178 ret -= 11000000;
179 ret = (ret + 500000) / 1000000;
180
181 ucontrol->value.enumerated.item[0] = ret;
182
183 return 0;
184 }
185
tse850_put_ana(struct snd_kcontrol * kctrl,struct snd_ctl_elem_value * ucontrol)186 static int tse850_put_ana(struct snd_kcontrol *kctrl,
187 struct snd_ctl_elem_value *ucontrol)
188 {
189 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
190 struct snd_soc_card *card = dapm->card;
191 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
192 struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
193 unsigned int uV = ucontrol->value.enumerated.item[0];
194 int ret;
195
196 if (uV >= e->items)
197 return -EINVAL;
198
199 /*
200 * Map enum zero (Low) to 2 volts on the regulator, do this since
201 * the ana regulator is supplied by the system 12V voltage and
202 * requesting anything below the system voltage causes the system
203 * voltage to be passed through the regulator. Also, the ana
204 * regulator induces noise when requesting voltages near the
205 * system voltage. So, by mapping Low to 2V, that noise is
206 * eliminated when all that is needed is 12V (the system voltage).
207 */
208 if (uV)
209 uV = 11000000 + (1000000 * uV);
210 else
211 uV = 2000000;
212
213 ret = regulator_set_voltage(tse850->ana, uV, uV);
214 if (ret < 0)
215 return ret;
216
217 return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
218 }
219
220 static const char * const mux_text[] = { "Mixer", "Loop" };
221
222 static const struct soc_enum mux_enum =
223 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);
224
225 static const struct snd_kcontrol_new mux1 =
226 SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);
227
228 static const struct snd_kcontrol_new mux2 =
229 SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);
230
231 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
232 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
233 .info = snd_soc_info_volsw, \
234 .get = xget, \
235 .put = xput, \
236 .private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
237
238 static const struct snd_kcontrol_new mix[] = {
239 TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
240 tse850_get_mix, tse850_put_mix),
241 };
242
243 static const char * const ana_text[] = {
244 "Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
245 };
246
247 static const struct soc_enum ana_enum =
248 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);
249
250 static const struct snd_kcontrol_new out =
251 SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);
252
253 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
254 SND_SOC_DAPM_LINE("OUT1", NULL),
255 SND_SOC_DAPM_LINE("OUT2", NULL),
256 SND_SOC_DAPM_LINE("IN1", NULL),
257 SND_SOC_DAPM_LINE("IN2", NULL),
258 SND_SOC_DAPM_INPUT("DAC"),
259 SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
260 SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
261 SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
262 SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
263 SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
264 SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
265 };
266
267 /*
268 * These connections are not entirely correct, since both IN1 and IN2
269 * are always fed to MIX (if the "IN switch" is set so), i.e. without
270 * regard to the loop1 and loop2 relays that according to this only
271 * control MUX1 and MUX2 but in fact also control how the input signals
272 * are routed.
273 * But, 1) I don't know how to do it right, and 2) it doesn't seem to
274 * matter in practice since nothing is powered in those sections anyway.
275 */
276 static const struct snd_soc_dapm_route tse850_intercon[] = {
277 { "OUT1", NULL, "MUX1" },
278 { "OUT2", NULL, "MUX2" },
279
280 { "MUX1", "Loop", "IN1" },
281 { "MUX1", "Mixer", "OUT" },
282
283 { "MUX2", "Loop", "IN2" },
284 { "MUX2", "Mixer", "OUT" },
285
286 { "OUT", NULL, "MIX" },
287
288 { "MIX", NULL, "DAC" },
289 { "MIX", "IN Switch", "IN1" },
290 { "MIX", "IN Switch", "IN2" },
291
292 /* connect board input to the codec left channel output pin */
293 { "DAC", NULL, "OUTL" },
294 };
295
296 SND_SOC_DAILINK_DEFS(pcm,
297 DAILINK_COMP_ARRAY(COMP_EMPTY()),
298 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")),
299 DAILINK_COMP_ARRAY(COMP_EMPTY()));
300
301 static struct snd_soc_dai_link tse850_dailink = {
302 .name = "TSE-850",
303 .stream_name = "TSE-850-PCM",
304 .dai_fmt = SND_SOC_DAIFMT_I2S
305 | SND_SOC_DAIFMT_NB_NF
306 | SND_SOC_DAIFMT_CBP_CFC,
307 SND_SOC_DAILINK_REG(pcm),
308 };
309
310 static struct snd_soc_card tse850_card = {
311 .name = "TSE-850-ASoC",
312 .owner = THIS_MODULE,
313 .dai_link = &tse850_dailink,
314 .num_links = 1,
315 .dapm_widgets = tse850_dapm_widgets,
316 .num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
317 .dapm_routes = tse850_intercon,
318 .num_dapm_routes = ARRAY_SIZE(tse850_intercon),
319 .fully_routed = true,
320 };
321
tse850_dt_init(struct platform_device * pdev)322 static int tse850_dt_init(struct platform_device *pdev)
323 {
324 struct device_node *np = pdev->dev.of_node;
325 struct device_node *codec_np, *cpu_np;
326 struct snd_soc_dai_link *dailink = &tse850_dailink;
327
328 if (!np) {
329 dev_err(&pdev->dev, "only device tree supported\n");
330 return -EINVAL;
331 }
332
333 cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
334 if (!cpu_np) {
335 dev_err(&pdev->dev, "failed to get cpu dai\n");
336 return -EINVAL;
337 }
338 dailink->cpus->of_node = cpu_np;
339 dailink->platforms->of_node = cpu_np;
340 of_node_put(cpu_np);
341
342 codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
343 if (!codec_np) {
344 dev_err(&pdev->dev, "failed to get codec info\n");
345 return -EINVAL;
346 }
347 dailink->codecs->of_node = codec_np;
348 of_node_put(codec_np);
349
350 return 0;
351 }
352
tse850_probe(struct platform_device * pdev)353 static int tse850_probe(struct platform_device *pdev)
354 {
355 struct snd_soc_card *card = &tse850_card;
356 struct device *dev = card->dev = &pdev->dev;
357 struct tse850_priv *tse850;
358 int ret;
359
360 tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
361 if (!tse850)
362 return -ENOMEM;
363
364 snd_soc_card_set_drvdata(card, tse850);
365
366 ret = tse850_dt_init(pdev);
367 if (ret) {
368 dev_err(dev, "failed to init dt info\n");
369 return ret;
370 }
371
372 tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
373 if (IS_ERR(tse850->add))
374 return dev_err_probe(dev, PTR_ERR(tse850->add),
375 "failed to get 'add' gpio\n");
376 tse850->add_cache = 1;
377
378 tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
379 if (IS_ERR(tse850->loop1))
380 return dev_err_probe(dev, PTR_ERR(tse850->loop1),
381 "failed to get 'loop1' gpio\n");
382 tse850->loop1_cache = 1;
383
384 tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
385 if (IS_ERR(tse850->loop2))
386 return dev_err_probe(dev, PTR_ERR(tse850->loop2),
387 "failed to get 'loop2' gpio\n");
388 tse850->loop2_cache = 1;
389
390 tse850->ana = devm_regulator_get(dev, "axentia,ana");
391 if (IS_ERR(tse850->ana))
392 return dev_err_probe(dev, PTR_ERR(tse850->ana),
393 "failed to get 'ana' regulator\n");
394
395 ret = regulator_enable(tse850->ana);
396 if (ret < 0) {
397 dev_err(dev, "failed to enable the 'ana' regulator\n");
398 return ret;
399 }
400
401 ret = snd_soc_register_card(card);
402 if (ret) {
403 dev_err(dev, "snd_soc_register_card failed\n");
404 goto err_disable_ana;
405 }
406
407 return 0;
408
409 err_disable_ana:
410 regulator_disable(tse850->ana);
411 return ret;
412 }
413
tse850_remove(struct platform_device * pdev)414 static void tse850_remove(struct platform_device *pdev)
415 {
416 struct snd_soc_card *card = platform_get_drvdata(pdev);
417 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
418
419 snd_soc_unregister_card(card);
420 regulator_disable(tse850->ana);
421 }
422
423 static const struct of_device_id tse850_dt_ids[] = {
424 { .compatible = "axentia,tse850-pcm5142", },
425 { /* sentinel */ }
426 };
427 MODULE_DEVICE_TABLE(of, tse850_dt_ids);
428
429 static struct platform_driver tse850_driver = {
430 .driver = {
431 .name = "axentia-tse850-pcm5142",
432 .of_match_table = tse850_dt_ids,
433 },
434 .probe = tse850_probe,
435 .remove_new = tse850_remove,
436 };
437
438 module_platform_driver(tse850_driver);
439
440 /* Module information */
441 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
442 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
443 MODULE_LICENSE("GPL v2");
444