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1 From 846864bceccdafbed86c1b1766500861547b0da9 Mon Sep 17 00:00:00 2001
2 From: Matt Flax <flatmax@flatmax.org>
3 Date: Wed, 8 Mar 2017 20:04:13 +1100
4 Subject: [PATCH] Add support for the AudioInjector.net Octo sound card
5
6 AudioInjector Octo: sample rates, regulators, reset
7
8 This patch adds new sample rates to the Audioinjector Octo sound card. The
9 new supported rates are (in kHz) :
10 96, 48, 32, 24, 16, 8, 88.2, 44.1, 29.4, 22.05, 14.7
11
12 Reference the bcm270x DT regulators in the overlay.
13
14 This patch adds a reset GPIO for the AudioInjector.net octo sound card.
15
16 Audioinjector octo : Make the playback and capture symmetric
17
18 This patch ensures that the sample rate and channel count of the audioinjector
19 octo sound card are symmetric.
20
21 audioinjector-octo: Add continuous clock feature
22
23 By user request, add a switch to prevent the clocks being stopped when
24 the stream is paused, stopped or shutdown. Provide access to the switch
25 by adding a 'non-stop-clocks' parameter to the audioinjector-addons
26 overlay.
27
28 See: https://github.com/raspberrypi/linux/issues/2409
29
30 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
31 ---
32 sound/soc/bcm/audioinjector-octo-soundcard.c | 336 +++++++++++++++++++
33 1 file changed, 336 insertions(+)
34 create mode 100644 sound/soc/bcm/audioinjector-octo-soundcard.c
35
36 --- /dev/null
37 +++ b/sound/soc/bcm/audioinjector-octo-soundcard.c
38 @@ -0,0 +1,336 @@
39 +/*
40 + * ASoC Driver for AudioInjector Pi octo channel soundcard (hat)
41 + *
42 + * Created on: 27-October-2016
43 + * Author: flatmax@flatmax.org
44 + * based on audioinjector-pi-soundcard.c
45 + *
46 + * Copyright (C) 2016 Flatmax Pty. Ltd.
47 + *
48 + * This program is free software; you can redistribute it and/or
49 + * modify it under the terms of the GNU General Public License
50 + * version 2 as published by the Free Software Foundation.
51 + *
52 + * This program is distributed in the hope that it will be useful, but
53 + * WITHOUT ANY WARRANTY; without even the implied warranty of
54 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
55 + * General Public License for more details.
56 + */
57 +
58 +#include <linux/module.h>
59 +#include <linux/types.h>
60 +#include <linux/gpio/consumer.h>
61 +
62 +#include <sound/core.h>
63 +#include <sound/soc.h>
64 +#include <sound/pcm_params.h>
65 +#include <sound/control.h>
66 +
67 +static struct gpio_descs *mult_gpios;
68 +static struct gpio_desc *codec_rst_gpio;
69 +static unsigned int audioinjector_octo_rate;
70 +static bool non_stop_clocks;
71 +
72 +static const unsigned int audioinjector_octo_rates[] = {
73 + 96000, 48000, 32000, 24000, 16000, 8000, 88200, 44100, 29400, 22050, 14700,
74 +};
75 +
76 +static struct snd_pcm_hw_constraint_list audioinjector_octo_constraints = {
77 + .list = audioinjector_octo_rates,
78 + .count = ARRAY_SIZE(audioinjector_octo_rates),
79 +};
80 +
81 +static int audioinjector_octo_dai_init(struct snd_soc_pcm_runtime *rtd)
82 +{
83 + return snd_soc_dai_set_bclk_ratio(rtd->cpu_dai, 64);
84 +}
85 +
86 +static int audioinjector_octo_startup(struct snd_pcm_substream *substream)
87 +{
88 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
89 + rtd->cpu_dai->driver->playback.channels_min = 8;
90 + rtd->cpu_dai->driver->playback.channels_max = 8;
91 + rtd->cpu_dai->driver->capture.channels_min = 8;
92 + rtd->cpu_dai->driver->capture.channels_max = 8;
93 + rtd->codec_dai->driver->capture.channels_max = 8;
94 +
95 + snd_pcm_hw_constraint_list(substream->runtime, 0,
96 + SNDRV_PCM_HW_PARAM_RATE,
97 + &audioinjector_octo_constraints);
98 +
99 + return 0;
100 +}
101 +
102 +static void audioinjector_octo_shutdown(struct snd_pcm_substream *substream)
103 +{
104 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
105 + rtd->cpu_dai->driver->playback.channels_min = 2;
106 + rtd->cpu_dai->driver->playback.channels_max = 2;
107 + rtd->cpu_dai->driver->capture.channels_min = 2;
108 + rtd->cpu_dai->driver->capture.channels_max = 2;
109 + rtd->codec_dai->driver->capture.channels_max = 6;
110 +}
111 +
112 +static int audioinjector_octo_hw_params(struct snd_pcm_substream *substream,
113 + struct snd_pcm_hw_params *params)
114 +{
115 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
116 +
117 + // set codec DAI configuration
118 + int ret = snd_soc_dai_set_fmt(rtd->codec_dai,
119 + SND_SOC_DAIFMT_CBS_CFS|SND_SOC_DAIFMT_DSP_A|
120 + SND_SOC_DAIFMT_NB_NF);
121 + if (ret < 0)
122 + return ret;
123 +
124 + // set cpu DAI configuration
125 + ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
126 + SND_SOC_DAIFMT_CBM_CFM|SND_SOC_DAIFMT_I2S|
127 + SND_SOC_DAIFMT_NB_NF);
128 + if (ret < 0)
129 + return ret;
130 +
131 + audioinjector_octo_rate = params_rate(params);
132 +
133 + // Set the correct sysclock for the codec
134 + switch (audioinjector_octo_rate) {
135 + case 96000:
136 + case 48000:
137 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000,
138 + 0);
139 + break;
140 + case 24000:
141 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000/2,
142 + 0);
143 + break;
144 + case 32000:
145 + case 16000:
146 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000/3,
147 + 0);
148 + break;
149 + case 8000:
150 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 49152000/6,
151 + 0);
152 + break;
153 + case 88200:
154 + case 44100:
155 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400,
156 + 0);
157 + break;
158 + case 22050:
159 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400/2,
160 + 0);
161 + break;
162 + case 29400:
163 + case 14700:
164 + return snd_soc_dai_set_sysclk(rtd->codec_dai, 0, 45185400/3,
165 + 0);
166 + break;
167 + default:
168 + return -EINVAL;
169 + }
170 +}
171 +
172 +static int audioinjector_octo_trigger(struct snd_pcm_substream *substream,
173 + int cmd){
174 + int mult[4];
175 +
176 + memset(mult, 0, sizeof(mult));
177 +
178 + switch (cmd) {
179 + case SNDRV_PCM_TRIGGER_STOP:
180 + case SNDRV_PCM_TRIGGER_SUSPEND:
181 + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
182 + if (!non_stop_clocks)
183 + break;
184 + /* Drop through... */
185 + case SNDRV_PCM_TRIGGER_START:
186 + case SNDRV_PCM_TRIGGER_RESUME:
187 + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
188 + switch (audioinjector_octo_rate) {
189 + case 96000:
190 + mult[3] = 1;
191 + case 88200:
192 + mult[1] = 1;
193 + mult[2] = 1;
194 + break;
195 + case 48000:
196 + mult[3] = 1;
197 + case 44100:
198 + mult[2] = 1;
199 + break;
200 + case 32000:
201 + mult[3] = 1;
202 + case 29400:
203 + mult[0] = 1;
204 + mult[1] = 1;
205 + break;
206 + case 24000:
207 + mult[3] = 1;
208 + case 22050:
209 + mult[1] = 1;
210 + break;
211 + case 16000:
212 + mult[3] = 1;
213 + case 14700:
214 + mult[0] = 1;
215 + break;
216 + case 8000:
217 + mult[3] = 1;
218 + break;
219 + default:
220 + return -EINVAL;
221 + }
222 + break;
223 + default:
224 + return -EINVAL;
225 + }
226 + gpiod_set_array_value_cansleep(mult_gpios->ndescs, mult_gpios->desc,
227 + mult);
228 +
229 + return 0;
230 +}
231 +
232 +static struct snd_soc_ops audioinjector_octo_ops = {
233 + .startup = audioinjector_octo_startup,
234 + .shutdown = audioinjector_octo_shutdown,
235 + .hw_params = audioinjector_octo_hw_params,
236 + .trigger = audioinjector_octo_trigger,
237 +};
238 +
239 +static struct snd_soc_dai_link audioinjector_octo_dai[] = {
240 + {
241 + .name = "AudioInjector Octo",
242 + .stream_name = "AudioInject-HIFI",
243 + .codec_dai_name = "cs42448",
244 + .ops = &audioinjector_octo_ops,
245 + .init = audioinjector_octo_dai_init,
246 + .symmetric_rates = 1,
247 + .symmetric_channels = 1,
248 + },
249 +};
250 +
251 +static const struct snd_soc_dapm_widget audioinjector_octo_widgets[] = {
252 + SND_SOC_DAPM_OUTPUT("OUTPUTS0"),
253 + SND_SOC_DAPM_OUTPUT("OUTPUTS1"),
254 + SND_SOC_DAPM_OUTPUT("OUTPUTS2"),
255 + SND_SOC_DAPM_OUTPUT("OUTPUTS3"),
256 + SND_SOC_DAPM_INPUT("INPUTS0"),
257 + SND_SOC_DAPM_INPUT("INPUTS1"),
258 + SND_SOC_DAPM_INPUT("INPUTS2"),
259 +};
260 +
261 +static const struct snd_soc_dapm_route audioinjector_octo_route[] = {
262 + /* Balanced outputs */
263 + {"OUTPUTS0", NULL, "AOUT1L"},
264 + {"OUTPUTS0", NULL, "AOUT1R"},
265 + {"OUTPUTS1", NULL, "AOUT2L"},
266 + {"OUTPUTS1", NULL, "AOUT2R"},
267 + {"OUTPUTS2", NULL, "AOUT3L"},
268 + {"OUTPUTS2", NULL, "AOUT3R"},
269 + {"OUTPUTS3", NULL, "AOUT4L"},
270 + {"OUTPUTS3", NULL, "AOUT4R"},
271 +
272 + /* Balanced inputs */
273 + {"AIN1L", NULL, "INPUTS0"},
274 + {"AIN1R", NULL, "INPUTS0"},
275 + {"AIN2L", NULL, "INPUTS1"},
276 + {"AIN2R", NULL, "INPUTS1"},
277 + {"AIN3L", NULL, "INPUTS2"},
278 + {"AIN3R", NULL, "INPUTS2"},
279 +};
280 +
281 +static struct snd_soc_card snd_soc_audioinjector_octo = {
282 + .name = "audioinjector-octo-soundcard",
283 + .dai_link = audioinjector_octo_dai,
284 + .num_links = ARRAY_SIZE(audioinjector_octo_dai),
285 +
286 + .dapm_widgets = audioinjector_octo_widgets,
287 + .num_dapm_widgets = ARRAY_SIZE(audioinjector_octo_widgets),
288 + .dapm_routes = audioinjector_octo_route,
289 + .num_dapm_routes = ARRAY_SIZE(audioinjector_octo_route),
290 +};
291 +
292 +static int audioinjector_octo_probe(struct platform_device *pdev)
293 +{
294 + struct snd_soc_card *card = &snd_soc_audioinjector_octo;
295 + int ret;
296 +
297 + card->dev = &pdev->dev;
298 +
299 + if (pdev->dev.of_node) {
300 + struct snd_soc_dai_link *dai = &audioinjector_octo_dai[0];
301 + struct device_node *i2s_node =
302 + of_parse_phandle(pdev->dev.of_node,
303 + "i2s-controller", 0);
304 + struct device_node *codec_node =
305 + of_parse_phandle(pdev->dev.of_node,
306 + "codec", 0);
307 +
308 + mult_gpios = devm_gpiod_get_array_optional(&pdev->dev, "mult",
309 + GPIOD_OUT_LOW);
310 + if (IS_ERR(mult_gpios))
311 + return PTR_ERR(mult_gpios);
312 +
313 + codec_rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
314 + GPIOD_OUT_LOW);
315 + if (IS_ERR(codec_rst_gpio))
316 + return PTR_ERR(codec_rst_gpio);
317 +
318 + non_stop_clocks = of_property_read_bool(pdev->dev.of_node, "non-stop-clocks");
319 +
320 + if (codec_rst_gpio)
321 + gpiod_set_value(codec_rst_gpio, 1);
322 + msleep(500);
323 + if (codec_rst_gpio)
324 + gpiod_set_value(codec_rst_gpio, 0);
325 + msleep(500);
326 + if (codec_rst_gpio)
327 + gpiod_set_value(codec_rst_gpio, 1);
328 + msleep(500);
329 +
330 + if (i2s_node && codec_node) {
331 + dai->cpu_dai_name = NULL;
332 + dai->cpu_of_node = i2s_node;
333 + dai->platform_name = NULL;
334 + dai->platform_of_node = i2s_node;
335 + dai->codec_name = NULL;
336 + dai->codec_of_node = codec_node;
337 + } else
338 + if (!dai->cpu_of_node) {
339 + dev_err(&pdev->dev,
340 + "i2s-controller missing or invalid in DT\n");
341 + return -EINVAL;
342 + } else {
343 + dev_err(&pdev->dev,
344 + "Property 'codec' missing or invalid\n");
345 + return -EINVAL;
346 + }
347 + }
348 +
349 + ret = devm_snd_soc_register_card(&pdev->dev, card);
350 + if (ret != 0)
351 + dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
352 + return ret;
353 +}
354 +
355 +static const struct of_device_id audioinjector_octo_of_match[] = {
356 + { .compatible = "ai,audioinjector-octo-soundcard", },
357 + {},
358 +};
359 +MODULE_DEVICE_TABLE(of, audioinjector_octo_of_match);
360 +
361 +static struct platform_driver audioinjector_octo_driver = {
362 + .driver = {
363 + .name = "audioinjector-octo",
364 + .owner = THIS_MODULE,
365 + .of_match_table = audioinjector_octo_of_match,
366 + },
367 + .probe = audioinjector_octo_probe,
368 +};
369 +
370 +module_platform_driver(audioinjector_octo_driver);
371 +MODULE_AUTHOR("Matt Flax <flatmax@flatmax.org>");
372 +MODULE_DESCRIPTION("AudioInjector.net octo Soundcard");
373 +MODULE_LICENSE("GPL v2");
374 +MODULE_ALIAS("platform:audioinjector-octo-soundcard");
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