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1 From 77dce745cd500cbe65e4cbb613c27c23e26f5bbb Mon Sep 17 00:00:00 2001
2 From: BabuSubashChandar <babuenir@gmail.com>
3 Date: Tue, 28 Mar 2017 20:04:42 +0530
4 Subject: [PATCH] Add support for Allo Boss DAC add-on board for
5 Raspberry Pi. (#1924)
6
7 Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net>
8 Reviewed-by: Deepak <deepak@zilogic.com>
9 Reviewed-by: BabuSubashChandar <babusubashchandar@zilogic.com>
10
11 Add support for new clock rate and mute gpios.
12
13 Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net>
14 Reviewed-by: Deepak <deepak@zilogic.com>
15 Reviewed-by: BabuSubashChandar <babusubashchandar@zilogic.com>
16
17 ASoC: allo-boss-dac: fix S24_LE format
18
19 Remove set_bclk_ratio call so 24-bit data is transmitted in
20 24 bclk cycles.
21
22 Signed-off-by: Matthias Reichl <hias@horus.com>
23
24 ASoC: allo-boss-dac: transmit S24_LE with 64 BCLK cycles
25
26 Signed-off-by: Matthias Reichl <hias@horus.com>
27 ---
28 drivers/clk/Makefile | 1 +
29 drivers/clk/clk-allo-dac.c | 161 ++++++++++++
30 sound/soc/bcm/allo-boss-dac.c | 456 ++++++++++++++++++++++++++++++++++
31 3 files changed, 618 insertions(+)
32 create mode 100644 drivers/clk/clk-allo-dac.c
33 create mode 100644 sound/soc/bcm/allo-boss-dac.c
34
35 --- a/drivers/clk/Makefile
36 +++ b/drivers/clk/Makefile
37 @@ -18,6 +18,7 @@ endif
38
39 # hardware specific clock types
40 # please keep this section sorted lexicographically by file path name
41 +obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC) += clk-allo-dac.o
42 obj-$(CONFIG_MACH_ASM9260) += clk-asm9260.o
43 obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o
44 obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o
45 --- /dev/null
46 +++ b/drivers/clk/clk-allo-dac.c
47 @@ -0,0 +1,161 @@
48 +/*
49 + * Clock Driver for Allo DAC
50 + *
51 + * Author: Baswaraj K <jaikumar@cem-solutions.net>
52 + * Copyright 2016
53 + * based on code by Stuart MacLean
54 + *
55 + * This program is free software; you can redistribute it and/or
56 + * modify it under the terms of the GNU General Public License
57 + * version 2 as published by the Free Software Foundation.
58 + *
59 + * This program is distributed in the hope that it will be useful, but
60 + * WITHOUT ANY WARRANTY; without even the implied warranty of
61 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
62 + * General Public License for more details.
63 + */
64 +
65 +#include <linux/clk-provider.h>
66 +#include <linux/clkdev.h>
67 +#include <linux/kernel.h>
68 +#include <linux/module.h>
69 +#include <linux/of.h>
70 +#include <linux/slab.h>
71 +#include <linux/platform_device.h>
72 +
73 +/* Clock rate of CLK44EN attached to GPIO6 pin */
74 +#define CLK_44EN_RATE 45158400UL
75 +/* Clock rate of CLK48EN attached to GPIO3 pin */
76 +#define CLK_48EN_RATE 49152000UL
77 +
78 +/**
79 + * struct allo_dac_clk - Common struct to the Allo DAC
80 + * @hw: clk_hw for the common clk framework
81 + * @mode: 0 => CLK44EN, 1 => CLK48EN
82 + */
83 +struct clk_allo_hw {
84 + struct clk_hw hw;
85 + uint8_t mode;
86 +};
87 +
88 +#define to_allo_clk(_hw) container_of(_hw, struct clk_allo_hw, hw)
89 +
90 +static const struct of_device_id clk_allo_dac_dt_ids[] = {
91 + { .compatible = "allo,dac-clk",},
92 + { }
93 +};
94 +MODULE_DEVICE_TABLE(of, clk_allo_dac_dt_ids);
95 +
96 +static unsigned long clk_allo_dac_recalc_rate(struct clk_hw *hw,
97 + unsigned long parent_rate)
98 +{
99 + return (to_allo_clk(hw)->mode == 0) ? CLK_44EN_RATE :
100 + CLK_48EN_RATE;
101 +}
102 +
103 +static long clk_allo_dac_round_rate(struct clk_hw *hw,
104 + unsigned long rate, unsigned long *parent_rate)
105 +{
106 + long actual_rate;
107 +
108 + if (rate <= CLK_44EN_RATE) {
109 + actual_rate = (long)CLK_44EN_RATE;
110 + } else if (rate >= CLK_48EN_RATE) {
111 + actual_rate = (long)CLK_48EN_RATE;
112 + } else {
113 + long diff44Rate = (long)(rate - CLK_44EN_RATE);
114 + long diff48Rate = (long)(CLK_48EN_RATE - rate);
115 +
116 + if (diff44Rate < diff48Rate)
117 + actual_rate = (long)CLK_44EN_RATE;
118 + else
119 + actual_rate = (long)CLK_48EN_RATE;
120 + }
121 + return actual_rate;
122 +}
123 +
124 +
125 +static int clk_allo_dac_set_rate(struct clk_hw *hw,
126 + unsigned long rate, unsigned long parent_rate)
127 +{
128 + unsigned long actual_rate;
129 + struct clk_allo_hw *clk = to_allo_clk(hw);
130 +
131 + actual_rate = (unsigned long)clk_allo_dac_round_rate(hw, rate,
132 + &parent_rate);
133 + clk->mode = (actual_rate == CLK_44EN_RATE) ? 0 : 1;
134 + return 0;
135 +}
136 +
137 +
138 +const struct clk_ops clk_allo_dac_rate_ops = {
139 + .recalc_rate = clk_allo_dac_recalc_rate,
140 + .round_rate = clk_allo_dac_round_rate,
141 + .set_rate = clk_allo_dac_set_rate,
142 +};
143 +
144 +static int clk_allo_dac_probe(struct platform_device *pdev)
145 +{
146 + int ret;
147 + struct clk_allo_hw *proclk;
148 + struct clk *clk;
149 + struct device *dev;
150 + struct clk_init_data init;
151 +
152 + dev = &pdev->dev;
153 +
154 + proclk = kzalloc(sizeof(struct clk_allo_hw), GFP_KERNEL);
155 + if (!proclk)
156 + return -ENOMEM;
157 +
158 + init.name = "clk-allo-dac";
159 + init.ops = &clk_allo_dac_rate_ops;
160 + init.flags = CLK_IS_BASIC;
161 + init.parent_names = NULL;
162 + init.num_parents = 0;
163 +
164 + proclk->mode = 0;
165 + proclk->hw.init = &init;
166 +
167 + clk = devm_clk_register(dev, &proclk->hw);
168 + if (!IS_ERR(clk)) {
169 + ret = of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
170 + clk);
171 + } else {
172 + dev_err(dev, "Fail to register clock driver\n");
173 + kfree(proclk);
174 + ret = PTR_ERR(clk);
175 + }
176 + return ret;
177 +}
178 +
179 +static int clk_allo_dac_remove(struct platform_device *pdev)
180 +{
181 + of_clk_del_provider(pdev->dev.of_node);
182 + return 0;
183 +}
184 +
185 +static struct platform_driver clk_allo_dac_driver = {
186 + .probe = clk_allo_dac_probe,
187 + .remove = clk_allo_dac_remove,
188 + .driver = {
189 + .name = "clk-allo-dac",
190 + .of_match_table = clk_allo_dac_dt_ids,
191 + },
192 +};
193 +
194 +static int __init clk_allo_dac_init(void)
195 +{
196 + return platform_driver_register(&clk_allo_dac_driver);
197 +}
198 +core_initcall(clk_allo_dac_init);
199 +
200 +static void __exit clk_allo_dac_exit(void)
201 +{
202 + platform_driver_unregister(&clk_allo_dac_driver);
203 +}
204 +module_exit(clk_allo_dac_exit);
205 +
206 +MODULE_DESCRIPTION("Allo DAC clock driver");
207 +MODULE_LICENSE("GPL v2");
208 +MODULE_ALIAS("platform:clk-allo-dac");
209 --- /dev/null
210 +++ b/sound/soc/bcm/allo-boss-dac.c
211 @@ -0,0 +1,456 @@
212 +/*
213 + * ALSA ASoC Machine Driver for Allo Boss DAC
214 + *
215 + * Author: Baswaraj K <jaikumar@cem-solutions.net>
216 + * Copyright 2017
217 + * based on code by Daniel Matuschek,
218 + * Stuart MacLean <stuart@hifiberry.com>
219 + * based on code by Florian Meier <florian.meier@koalo.de>
220 + *
221 + * This program is free software; you can redistribute it and/or
222 + * modify it under the terms of the GNU General Public License
223 + * version 2 as published by the Free Software Foundation.
224 + *
225 + * This program is distributed in the hope that it will be useful, but
226 + * WITHOUT ANY WARRANTY; without even the implied warranty of
227 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
228 + * General Public License for more details.
229 + */
230 +
231 +#include <linux/module.h>
232 +#include <linux/gpio/consumer.h>
233 +#include <linux/platform_device.h>
234 +#include <linux/clk.h>
235 +#include <linux/delay.h>
236 +
237 +#include <sound/core.h>
238 +#include <sound/pcm.h>
239 +#include <sound/pcm_params.h>
240 +#include <sound/soc.h>
241 +#include "../codecs/pcm512x.h"
242 +
243 +#define ALLO_BOSS_NOCLOCK 0
244 +#define ALLO_BOSS_CLK44EN 1
245 +#define ALLO_BOSS_CLK48EN 2
246 +
247 +struct pcm512x_priv {
248 + struct regmap *regmap;
249 + struct clk *sclk;
250 +};
251 +
252 +static struct gpio_desc *mute_gpio;
253 +
254 +/* Clock rate of CLK44EN attached to GPIO6 pin */
255 +#define CLK_44EN_RATE 45158400UL
256 +/* Clock rate of CLK48EN attached to GPIO3 pin */
257 +#define CLK_48EN_RATE 49152000UL
258 +
259 +static bool slave;
260 +static bool snd_soc_allo_boss_master;
261 +static bool digital_gain_0db_limit = true;
262 +
263 +static void snd_allo_boss_select_clk(struct snd_soc_component *component,
264 + int clk_id)
265 +{
266 + switch (clk_id) {
267 + case ALLO_BOSS_NOCLOCK:
268 + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x00);
269 + break;
270 + case ALLO_BOSS_CLK44EN:
271 + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x20);
272 + break;
273 + case ALLO_BOSS_CLK48EN:
274 + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
275 + break;
276 + }
277 +}
278 +
279 +static void snd_allo_boss_clk_gpio(struct snd_soc_component *component)
280 +{
281 + snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x24, 0x24);
282 + snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02);
283 + snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02);
284 +}
285 +
286 +static bool snd_allo_boss_is_sclk(struct snd_soc_component *component)
287 +{
288 + unsigned int sck;
289 +
290 + snd_soc_component_read(component, PCM512x_RATE_DET_4, &sck);
291 + return (!(sck & 0x40));
292 +}
293 +
294 +static bool snd_allo_boss_is_sclk_sleep(
295 + struct snd_soc_component *component)
296 +{
297 + msleep(2);
298 + return snd_allo_boss_is_sclk(component);
299 +}
300 +
301 +static bool snd_allo_boss_is_master_card(struct snd_soc_component *component)
302 +{
303 + bool isClk44EN, isClk48En, isNoClk;
304 +
305 + snd_allo_boss_clk_gpio(component);
306 +
307 + snd_allo_boss_select_clk(component, ALLO_BOSS_CLK44EN);
308 + isClk44EN = snd_allo_boss_is_sclk_sleep(component);
309 +
310 + snd_allo_boss_select_clk(component, ALLO_BOSS_NOCLOCK);
311 + isNoClk = snd_allo_boss_is_sclk_sleep(component);
312 +
313 + snd_allo_boss_select_clk(component, ALLO_BOSS_CLK48EN);
314 + isClk48En = snd_allo_boss_is_sclk_sleep(component);
315 +
316 + return (isClk44EN && isClk48En && !isNoClk);
317 +}
318 +
319 +static int snd_allo_boss_clk_for_rate(int sample_rate)
320 +{
321 + int type;
322 +
323 + switch (sample_rate) {
324 + case 11025:
325 + case 22050:
326 + case 44100:
327 + case 88200:
328 + case 176400:
329 + case 352800:
330 + type = ALLO_BOSS_CLK44EN;
331 + break;
332 + default:
333 + type = ALLO_BOSS_CLK48EN;
334 + break;
335 + }
336 + return type;
337 +}
338 +
339 +static void snd_allo_boss_set_sclk(struct snd_soc_component *component,
340 + int sample_rate)
341 +{
342 + struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
343 +
344 + if (!IS_ERR(pcm512x->sclk)) {
345 + int ctype;
346 +
347 + ctype = snd_allo_boss_clk_for_rate(sample_rate);
348 + clk_set_rate(pcm512x->sclk, (ctype == ALLO_BOSS_CLK44EN)
349 + ? CLK_44EN_RATE : CLK_48EN_RATE);
350 + snd_allo_boss_select_clk(component, ctype);
351 + }
352 +}
353 +
354 +static int snd_allo_boss_init(struct snd_soc_pcm_runtime *rtd)
355 +{
356 + struct snd_soc_component *component = rtd->codec_dai->component;
357 + struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component);
358 +
359 + if (slave)
360 + snd_soc_allo_boss_master = false;
361 + else
362 + snd_soc_allo_boss_master =
363 + snd_allo_boss_is_master_card(component);
364 +
365 + if (snd_soc_allo_boss_master) {
366 + struct snd_soc_dai_link *dai = rtd->dai_link;
367 +
368 + dai->name = "BossDAC";
369 + dai->stream_name = "Boss DAC HiFi [Master]";
370 + dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
371 + | SND_SOC_DAIFMT_CBM_CFM;
372 +
373 + snd_soc_component_update_bits(component, PCM512x_BCLK_LRCLK_CFG, 0x31, 0x11);
374 + snd_soc_component_update_bits(component, PCM512x_MASTER_MODE, 0x03, 0x03);
375 + snd_soc_component_update_bits(component, PCM512x_MASTER_CLKDIV_2, 0x7f, 63);
376 + /*
377 + * Default sclk to CLK_48EN_RATE, otherwise codec
378 + * pcm512x_dai_startup_master method could call
379 + * snd_pcm_hw_constraint_ratnums using CLK_44EN/64
380 + * which will mask 384k sample rate.
381 + */
382 + if (!IS_ERR(priv->sclk))
383 + clk_set_rate(priv->sclk, CLK_48EN_RATE);
384 + } else {
385 + priv->sclk = ERR_PTR(-ENOENT);
386 + }
387 +
388 + snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x08, 0x08);
389 + snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
390 + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
391 +
392 + if (digital_gain_0db_limit) {
393 + int ret;
394 + struct snd_soc_card *card = rtd->card;
395 +
396 + ret = snd_soc_limit_volume(card, "Digital Playback Volume",
397 + 207);
398 + if (ret < 0)
399 + dev_warn(card->dev, "Failed to set volume limit: %d\n",
400 + ret);
401 + }
402 +
403 + return 0;
404 +}
405 +
406 +static int snd_allo_boss_update_rate_den(
407 + struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
408 +{
409 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
410 + struct snd_soc_component *component = rtd->codec_dai->component;
411 + struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
412 + struct snd_ratnum *rats_no_pll;
413 + unsigned int num = 0, den = 0;
414 + int err;
415 +
416 + rats_no_pll = devm_kzalloc(rtd->dev, sizeof(*rats_no_pll), GFP_KERNEL);
417 + if (!rats_no_pll)
418 + return -ENOMEM;
419 +
420 + rats_no_pll->num = clk_get_rate(pcm512x->sclk) / 64;
421 + rats_no_pll->den_min = 1;
422 + rats_no_pll->den_max = 128;
423 + rats_no_pll->den_step = 1;
424 +
425 + err = snd_interval_ratnum(hw_param_interval(params,
426 + SNDRV_PCM_HW_PARAM_RATE), 1, rats_no_pll, &num, &den);
427 + if (err >= 0 && den) {
428 + params->rate_num = num;
429 + params->rate_den = den;
430 + }
431 +
432 + devm_kfree(rtd->dev, rats_no_pll);
433 + return 0;
434 +}
435 +
436 +static void snd_allo_boss_gpio_mute(struct snd_soc_card *card)
437 +{
438 + if (mute_gpio)
439 + gpiod_set_value_cansleep(mute_gpio, 1);
440 +}
441 +
442 +static void snd_allo_boss_gpio_unmute(struct snd_soc_card *card)
443 +{
444 + if (mute_gpio)
445 + gpiod_set_value_cansleep(mute_gpio, 0);
446 +}
447 +
448 +static int snd_allo_boss_set_bias_level(struct snd_soc_card *card,
449 + struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
450 +{
451 + struct snd_soc_pcm_runtime *rtd;
452 + struct snd_soc_dai *codec_dai;
453 +
454 + rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
455 + codec_dai = rtd->codec_dai;
456 +
457 + if (dapm->dev != codec_dai->dev)
458 + return 0;
459 +
460 + switch (level) {
461 + case SND_SOC_BIAS_PREPARE:
462 + if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
463 + break;
464 + /* UNMUTE DAC */
465 + snd_allo_boss_gpio_unmute(card);
466 + break;
467 +
468 + case SND_SOC_BIAS_STANDBY:
469 + if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
470 + break;
471 + /* MUTE DAC */
472 + snd_allo_boss_gpio_mute(card);
473 + break;
474 +
475 + default:
476 + break;
477 + }
478 +
479 + return 0;
480 +}
481 +
482 +static int snd_allo_boss_hw_params(
483 + struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
484 +{
485 + int ret = 0;
486 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
487 + int channels = params_channels(params);
488 + int width = snd_pcm_format_physical_width(params_format(params));
489 +
490 + if (snd_soc_allo_boss_master) {
491 + struct snd_soc_component *component = rtd->codec_dai->component;
492 +
493 + snd_allo_boss_set_sclk(component,
494 + params_rate(params));
495 +
496 + ret = snd_allo_boss_update_rate_den(
497 + substream, params);
498 + if (ret)
499 + return ret;
500 + }
501 +
502 + ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x03, 0x03,
503 + channels, width);
504 + if (ret)
505 + return ret;
506 + ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x03, 0x03,
507 + channels, width);
508 + return ret;
509 +}
510 +
511 +static int snd_allo_boss_startup(
512 + struct snd_pcm_substream *substream)
513 +{
514 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
515 + struct snd_soc_component *component = rtd->codec_dai->component;
516 + struct snd_soc_card *card = rtd->card;
517 +
518 + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
519 + snd_allo_boss_gpio_mute(card);
520 +
521 + if (snd_soc_allo_boss_master) {
522 + struct pcm512x_priv *priv = snd_soc_component_get_drvdata(component);
523 + /*
524 + * Default sclk to CLK_48EN_RATE, otherwise codec
525 + * pcm512x_dai_startup_master method could call
526 + * snd_pcm_hw_constraint_ratnums using CLK_44EN/64
527 + * which will mask 384k sample rate.
528 + */
529 + if (!IS_ERR(priv->sclk))
530 + clk_set_rate(priv->sclk, CLK_48EN_RATE);
531 + }
532 +
533 + return 0;
534 +}
535 +
536 +static void snd_allo_boss_shutdown(
537 + struct snd_pcm_substream *substream)
538 +{
539 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
540 + struct snd_soc_component *component = rtd->codec_dai->component;
541 +
542 + snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x00);
543 +}
544 +
545 +static int snd_allo_boss_prepare(
546 + struct snd_pcm_substream *substream)
547 +{
548 + struct snd_soc_pcm_runtime *rtd = substream->private_data;
549 + struct snd_soc_card *card = rtd->card;
550 +
551 + snd_allo_boss_gpio_unmute(card);
552 + return 0;
553 +}
554 +/* machine stream operations */
555 +static struct snd_soc_ops snd_allo_boss_ops = {
556 + .hw_params = snd_allo_boss_hw_params,
557 + .startup = snd_allo_boss_startup,
558 + .shutdown = snd_allo_boss_shutdown,
559 + .prepare = snd_allo_boss_prepare,
560 +};
561 +
562 +static struct snd_soc_dai_link snd_allo_boss_dai[] = {
563 +{
564 + .name = "Boss DAC",
565 + .stream_name = "Boss DAC HiFi",
566 + .cpu_dai_name = "bcm2708-i2s.0",
567 + .codec_dai_name = "pcm512x-hifi",
568 + .platform_name = "bcm2708-i2s.0",
569 + .codec_name = "pcm512x.1-004d",
570 + .dai_fmt = SND_SOC_DAIFMT_I2S |
571 + SND_SOC_DAIFMT_NB_NF |
572 + SND_SOC_DAIFMT_CBS_CFS,
573 + .ops = &snd_allo_boss_ops,
574 + .init = snd_allo_boss_init,
575 +},
576 +};
577 +
578 +/* audio machine driver */
579 +static struct snd_soc_card snd_allo_boss = {
580 + .name = "BossDAC",
581 + .owner = THIS_MODULE,
582 + .dai_link = snd_allo_boss_dai,
583 + .num_links = ARRAY_SIZE(snd_allo_boss_dai),
584 +};
585 +
586 +static int snd_allo_boss_probe(struct platform_device *pdev)
587 +{
588 + int ret = 0;
589 +
590 + snd_allo_boss.dev = &pdev->dev;
591 +
592 + if (pdev->dev.of_node) {
593 + struct device_node *i2s_node;
594 + struct snd_soc_dai_link *dai;
595 +
596 + dai = &snd_allo_boss_dai[0];
597 + i2s_node = of_parse_phandle(pdev->dev.of_node,
598 + "i2s-controller", 0);
599 +
600 + if (i2s_node) {
601 + dai->cpu_dai_name = NULL;
602 + dai->cpu_of_node = i2s_node;
603 + dai->platform_name = NULL;
604 + dai->platform_of_node = i2s_node;
605 + }
606 +
607 + digital_gain_0db_limit = !of_property_read_bool(
608 + pdev->dev.of_node, "allo,24db_digital_gain");
609 + slave = of_property_read_bool(pdev->dev.of_node,
610 + "allo,slave");
611 +
612 + mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute",
613 + GPIOD_OUT_LOW);
614 + if (IS_ERR(mute_gpio)) {
615 + ret = PTR_ERR(mute_gpio);
616 + dev_err(&pdev->dev,
617 + "failed to get mute gpio: %d\n", ret);
618 + return ret;
619 + }
620 +
621 + if (mute_gpio)
622 + snd_allo_boss.set_bias_level =
623 + snd_allo_boss_set_bias_level;
624 +
625 + ret = snd_soc_register_card(&snd_allo_boss);
626 + if (ret) {
627 + dev_err(&pdev->dev,
628 + "snd_soc_register_card() failed: %d\n", ret);
629 + return ret;
630 + }
631 +
632 + if (mute_gpio)
633 + snd_allo_boss_gpio_mute(&snd_allo_boss);
634 +
635 + return 0;
636 + }
637 +
638 + return -EINVAL;
639 +}
640 +
641 +static int snd_allo_boss_remove(struct platform_device *pdev)
642 +{
643 + snd_allo_boss_gpio_mute(&snd_allo_boss);
644 + return snd_soc_unregister_card(&snd_allo_boss);
645 +}
646 +
647 +static const struct of_device_id snd_allo_boss_of_match[] = {
648 + { .compatible = "allo,boss-dac", },
649 + { /* sentinel */ },
650 +};
651 +MODULE_DEVICE_TABLE(of, snd_allo_boss_of_match);
652 +
653 +static struct platform_driver snd_allo_boss_driver = {
654 + .driver = {
655 + .name = "snd-allo-boss-dac",
656 + .owner = THIS_MODULE,
657 + .of_match_table = snd_allo_boss_of_match,
658 + },
659 + .probe = snd_allo_boss_probe,
660 + .remove = snd_allo_boss_remove,
661 +};
662 +
663 +module_platform_driver(snd_allo_boss_driver);
664 +
665 +MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
666 +MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Boss DAC");
667 +MODULE_LICENSE("GPL v2");
Staging tree of Linus Walleij