From 2e0deecb1e303b2808c9c84486d20039741b773b Mon Sep 17 00:00:00 2001
From: escalator2015 <jmtasende@gmail.com>
Date: Tue, 24 May 2016 16:20:09 +0100
Subject: [PATCH] New driver for RRA DigiDAC1 soundcard using WM8741 +
 WM8804

ASoC: digidac1-soundcard: use modern dai_link style

Signed-off-by: Hui Wang <hui.wang@canonical.com>
---
 sound/soc/bcm/digidac1-soundcard.c | 421 +++++++++++++++++++++++++++++
 1 file changed, 421 insertions(+)
 create mode 100644 sound/soc/bcm/digidac1-soundcard.c

--- /dev/null
+++ b/sound/soc/bcm/digidac1-soundcard.c
@@ -0,0 +1,421 @@
+/*
+ * ASoC Driver for RRA DigiDAC1
+ * Copyright 2016
+ * Author: José M. Tasende <vintage@redrocksaudio.es>
+ * based on the HifiBerry DAC driver by Florian Meier <florian.meier@koalo.de>
+ * and the Wolfson card driver by Nikesh Oswal, <Nikesh.Oswal@wolfsonmicro.com>
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+#include <sound/soc-dapm.h>
+#include <sound/tlv.h>
+#include <linux/regulator/consumer.h>
+
+#include "../codecs/wm8804.h"
+#include "../codecs/wm8741.h"
+
+#define WM8741_NUM_SUPPLIES 2
+
+/* codec private data */
+struct wm8741_priv {
+	struct wm8741_platform_data pdata;
+	struct regmap *regmap;
+	struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
+	unsigned int sysclk;
+	const struct snd_pcm_hw_constraint_list *sysclk_constraints;
+};
+
+static int samplerate = 44100;
+
+/* New Alsa Controls not exposed by original wm8741 codec driver	*/
+/* in actual driver the att. adjustment is wrong because		*/
+/* this DAC has a coarse attenuation register with 4dB steps		*/
+/* and a fine level register with 0.125dB steps				*/
+/* each register has 32 steps so combining both we have	1024 steps	*/
+/* of 0.125 dB.								*/
+/* The original level controls from driver are removed at startup	*/
+/* and replaced by the corrected ones.					*/
+/* The same wm8741 driver can be used for wm8741 and wm8742 devices	*/
+
+static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, 0, 13, 0);
+static const DECLARE_TLV_DB_SCALE(dac_tlv_coarse, -12700, 400, 1);
+static const char *w8741_dither[4] = {"Off", "RPDF", "TPDF", "HPDF"};
+static const char *w8741_filter[5] = {
+		"Type 1", "Type 2", "Type 3", "Type 4", "Type 5"};
+static const char *w8741_switch[2] = {"Off", "On"};
+static const struct soc_enum w8741_enum[] = {
+SOC_ENUM_SINGLE(WM8741_MODE_CONTROL_2, 0, 4, w8741_dither),/* dithering type */
+SOC_ENUM_SINGLE(WM8741_FILTER_CONTROL, 0, 5, w8741_filter),/* filter type */
+SOC_ENUM_SINGLE(WM8741_FORMAT_CONTROL, 6, 2, w8741_switch),/* phase invert */
+SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 0, 2, w8741_switch),/* volume ramp */
+SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 3, 2, w8741_switch),/* soft mute */
+};
+
+static const struct snd_kcontrol_new w8741_snd_controls_stereo[] = {
+SOC_DOUBLE_R_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
+		WM8741_DACRLSB_ATTENUATION, 0, 31, 1, dac_tlv_fine),
+SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
+		WM8741_DACRMSB_ATTENUATION, 0, 31, 1, dac_tlv_coarse),
+SOC_ENUM("DAC Dither", w8741_enum[0]),
+SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
+SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
+SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
+SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
+};
+
+static const struct snd_kcontrol_new w8741_snd_controls_mono_left[] = {
+SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
+		0, 31, 0, dac_tlv_fine),
+SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
+		0, 31, 1, dac_tlv_coarse),
+SOC_ENUM("DAC Dither", w8741_enum[0]),
+SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
+SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
+SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
+SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
+};
+
+static const struct snd_kcontrol_new w8741_snd_controls_mono_right[] = {
+SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACRLSB_ATTENUATION,
+	0, 31, 0, dac_tlv_fine),
+SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACRMSB_ATTENUATION,
+	0, 31, 1, dac_tlv_coarse),
+SOC_ENUM("DAC Dither", w8741_enum[0]),
+SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
+SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
+SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
+SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
+};
+
+static int w8741_add_controls(struct snd_soc_component *component)
+{
+	struct wm8741_priv *wm8741 = snd_soc_component_get_drvdata(component);
+
+	switch (wm8741->pdata.diff_mode) {
+	case WM8741_DIFF_MODE_STEREO:
+	case WM8741_DIFF_MODE_STEREO_REVERSED:
+		snd_soc_add_component_controls(component,
+				w8741_snd_controls_stereo,
+				ARRAY_SIZE(w8741_snd_controls_stereo));
+		break;
+	case WM8741_DIFF_MODE_MONO_LEFT:
+		snd_soc_add_component_controls(component,
+				w8741_snd_controls_mono_left,
+				ARRAY_SIZE(w8741_snd_controls_mono_left));
+		break;
+	case WM8741_DIFF_MODE_MONO_RIGHT:
+		snd_soc_add_component_controls(component,
+				w8741_snd_controls_mono_right,
+				ARRAY_SIZE(w8741_snd_controls_mono_right));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int digidac1_soundcard_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *component = rtd->codec_dai->component;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_pcm_runtime *wm8741_rtd;
+	struct snd_soc_component *wm8741_component;
+	struct snd_card *sound_card = card->snd_card;
+	struct snd_kcontrol *kctl;
+	int ret;
+
+	wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
+	if (!wm8741_rtd) {
+		dev_warn(card->dev, "digidac1_soundcard_init: couldn't get wm8741 rtd\n");
+		return -EFAULT;
+	}
+	wm8741_component = wm8741_rtd->codec_dai->component;
+	ret = w8741_add_controls(wm8741_component);
+	if (ret < 0)
+		dev_warn(card->dev, "Failed to add new wm8741 controls: %d\n",
+		ret);
+
+	/* enable TX output */
+	snd_soc_component_update_bits(component, WM8804_PWRDN, 0x4, 0x0);
+
+	kctl = snd_soc_card_get_kcontrol(card,
+		"Playback Volume");
+	if (kctl) {
+		kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
+		snd_ctl_remove(sound_card, kctl);
+		}
+	kctl = snd_soc_card_get_kcontrol(card,
+		"Fine Playback Volume");
+	if (kctl) {
+		kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
+		snd_ctl_remove(sound_card, kctl);
+		}
+	return 0;
+}
+
+static int digidac1_soundcard_startup(struct snd_pcm_substream *substream)
+{
+	/* turn on wm8804 digital output */
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component = rtd->codec_dai->component;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_pcm_runtime *wm8741_rtd;
+	struct snd_soc_component *wm8741_component;
+
+	snd_soc_component_update_bits(component, WM8804_PWRDN, 0x3c, 0x00);
+	wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
+	if (!wm8741_rtd) {
+		dev_warn(card->dev, "digidac1_soundcard_startup: couldn't get WM8741 rtd\n");
+		return -EFAULT;
+	}
+	wm8741_component = wm8741_rtd->codec_dai->component;
+
+	/* latch wm8741 level */
+	snd_soc_component_update_bits(wm8741_component, WM8741_DACLLSB_ATTENUATION,
+		WM8741_UPDATELL, WM8741_UPDATELL);
+	snd_soc_component_update_bits(wm8741_component, WM8741_DACLMSB_ATTENUATION,
+		WM8741_UPDATELM, WM8741_UPDATELM);
+	snd_soc_component_update_bits(wm8741_component, WM8741_DACRLSB_ATTENUATION,
+		WM8741_UPDATERL, WM8741_UPDATERL);
+	snd_soc_component_update_bits(wm8741_component, WM8741_DACRMSB_ATTENUATION,
+		WM8741_UPDATERM, WM8741_UPDATERM);
+
+	return 0;
+}
+
+static void digidac1_soundcard_shutdown(struct snd_pcm_substream *substream)
+{
+	/* turn off wm8804 digital output */
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component = rtd->codec_dai->component;
+
+	snd_soc_component_update_bits(component, WM8804_PWRDN, 0x3c, 0x3c);
+}
+
+static int digidac1_soundcard_hw_params(struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_component *component = rtd->codec_dai->component;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_pcm_runtime *wm8741_rtd;
+	struct snd_soc_component *wm8741_component;
+
+	int sysclk = 27000000;
+	long mclk_freq = 0;
+	int mclk_div = 1;
+	int sampling_freq = 1;
+	int ret;
+
+	wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
+	if (!wm8741_rtd) {
+		dev_warn(card->dev, "digidac1_soundcard_hw_params: couldn't get WM8741 rtd\n");
+		return -EFAULT;
+	}
+	wm8741_component = wm8741_rtd->codec_dai->component;
+	samplerate = params_rate(params);
+
+	if (samplerate <= 96000) {
+		mclk_freq = samplerate*256;
+		mclk_div = WM8804_MCLKDIV_256FS;
+	} else {
+		mclk_freq = samplerate*128;
+		mclk_div = WM8804_MCLKDIV_128FS;
+		}
+
+	switch (samplerate) {
+	case 32000:
+		sampling_freq = 0x03;
+		break;
+	case 44100:
+		sampling_freq = 0x00;
+		break;
+	case 48000:
+		sampling_freq = 0x02;
+		break;
+	case 88200:
+		sampling_freq = 0x08;
+		break;
+	case 96000:
+		sampling_freq = 0x0a;
+		break;
+	case 176400:
+		sampling_freq = 0x0c;
+		break;
+	case 192000:
+		sampling_freq = 0x0e;
+		break;
+	default:
+		dev_err(card->dev,
+		"Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
+		samplerate);
+	}
+
+	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
+	snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
+		sysclk, SND_SOC_CLOCK_OUT);
+	if (ret < 0) {
+		dev_err(card->dev,
+		"Failed to set WM8804 SYSCLK: %d\n", ret);
+		return ret;
+	}
+	/* Enable wm8804 TX output */
+	snd_soc_component_update_bits(component, WM8804_PWRDN, 0x4, 0x0);
+
+	/* wm8804 Power on */
+	snd_soc_component_update_bits(component, WM8804_PWRDN, 0x9, 0);
+
+	/* wm8804 set sampling frequency status bits */
+	snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f, sampling_freq);
+
+	/* Now update wm8741 registers for the correct oversampling */
+	if (samplerate <= 48000)
+		snd_soc_component_update_bits(wm8741_component, WM8741_MODE_CONTROL_1,
+		 WM8741_OSR_MASK, 0x00);
+	else if (samplerate <= 96000)
+		snd_soc_component_update_bits(wm8741_component, WM8741_MODE_CONTROL_1,
+		 WM8741_OSR_MASK, 0x20);
+	else
+		snd_soc_component_update_bits(wm8741_component, WM8741_MODE_CONTROL_1,
+		 WM8741_OSR_MASK, 0x40);
+
+	/* wm8741 bit size */
+	switch (params_width(params)) {
+	case 16:
+		snd_soc_component_update_bits(wm8741_component, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x00);
+		break;
+	case 20:
+		snd_soc_component_update_bits(wm8741_component, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x01);
+		break;
+	case 24:
+		snd_soc_component_update_bits(wm8741_component, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x02);
+		break;
+	case 32:
+		snd_soc_component_update_bits(wm8741_component, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x03);
+		break;
+	default:
+		dev_dbg(card->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
+			params_width(params));
+		return -EINVAL;
+	}
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+/* machine stream operations */
+static struct snd_soc_ops digidac1_soundcard_ops = {
+	.hw_params	= digidac1_soundcard_hw_params,
+	.startup	= digidac1_soundcard_startup,
+	.shutdown	= digidac1_soundcard_shutdown,
+};
+
+SND_SOC_DAILINK_DEFS(digidac1,
+	DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
+	DAILINK_COMP_ARRAY(COMP_CODEC("wm8804.1-003b", "wm8804-spdif")),
+	DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2835-i2s.0")));
+
+SND_SOC_DAILINK_DEFS(digidac11,
+	DAILINK_COMP_ARRAY(COMP_CPU("wm8804-spdif")),
+	DAILINK_COMP_ARRAY(COMP_CODEC("wm8741.1-001a", "wm8741")),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link digidac1_soundcard_dai[] = {
+	{
+	.name		= "RRA DigiDAC1",
+	.stream_name	= "RRA DigiDAC1 HiFi",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBM_CFM,
+	.ops		= &digidac1_soundcard_ops,
+	.init		= digidac1_soundcard_init,
+	SND_SOC_DAILINK_REG(digidac1),
+	},
+	{
+	.name		= "RRA DigiDAC11",
+	.stream_name	= "RRA DigiDAC11 HiFi",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S
+			| SND_SOC_DAIFMT_NB_NF
+			| SND_SOC_DAIFMT_CBS_CFS,
+	SND_SOC_DAILINK_REG(digidac11),
+	},
+};
+
+/* audio machine driver */
+static struct snd_soc_card digidac1_soundcard = {
+	.name		= "digidac1-soundcard",
+	.owner		= THIS_MODULE,
+	.dai_link	= digidac1_soundcard_dai,
+	.num_links	= ARRAY_SIZE(digidac1_soundcard_dai),
+};
+
+static int digidac1_soundcard_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	digidac1_soundcard.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai = &digidac1_soundcard_dai[0];
+
+		i2s_node = of_parse_phandle(pdev->dev.of_node,
+					"i2s-controller", 0);
+
+		if (i2s_node) {
+			dai->cpus->dai_name = NULL;
+			dai->cpus->of_node = i2s_node;
+			dai->platforms->name = NULL;
+			dai->platforms->of_node = i2s_node;
+		}
+	}
+
+	ret = devm_snd_soc_register_card(&pdev->dev, &digidac1_soundcard);
+	if (ret && ret != -EPROBE_DEFER)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+			ret);
+
+	return ret;
+}
+
+static const struct of_device_id digidac1_soundcard_of_match[] = {
+	{ .compatible = "rra,digidac1-soundcard", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, digidac1_soundcard_of_match);
+
+static struct platform_driver digidac1_soundcard_driver = {
+	.driver = {
+			.name		= "digidac1-audio",
+			.owner		= THIS_MODULE,
+			.of_match_table	= digidac1_soundcard_of_match,
+	},
+	.probe		= digidac1_soundcard_probe,
+};
+
+module_platform_driver(digidac1_soundcard_driver);
+
+MODULE_AUTHOR("José M. Tasende <vintage@redrocksaudio.es>");
+MODULE_DESCRIPTION("ASoC Driver for RRA DigiDAC1");
+MODULE_LICENSE("GPL v2");
