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a7dc662c6a
Work is guaranteed to be initialized on exit. Drop the unnecessary
if statement and always call flush_work.
This fixes a warning seen with clang:
sound/soc/codecs/pcm1789.c:265:13: warning: address of 'priv->work' will
always evaluate to 'true' [-Wpointer-bool-conversion]
if (&priv->work)
~~ ~~~~~~^~~~
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Mark Brown <broonie@kernel.org>
274 lines
6.7 KiB
C
274 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Audio driver for PCM1789
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// Copyright (C) 2018 Bootlin
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// Mylène Josserand <mylene.josserand@bootlin.com>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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#include "pcm1789.h"
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#define PCM1789_MUTE_CONTROL 0x10
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#define PCM1789_FMT_CONTROL 0x11
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#define PCM1789_SOFT_MUTE 0x14
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#define PCM1789_DAC_VOL_LEFT 0x18
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#define PCM1789_DAC_VOL_RIGHT 0x19
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#define PCM1789_FMT_MASK 0x07
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#define PCM1789_MUTE_MASK 0x03
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#define PCM1789_MUTE_SRET 0x06
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struct pcm1789_private {
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struct regmap *regmap;
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unsigned int format;
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unsigned int rate;
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struct gpio_desc *reset;
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struct work_struct work;
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struct device *dev;
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};
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static const struct reg_default pcm1789_reg_defaults[] = {
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{ PCM1789_FMT_CONTROL, 0x00 },
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{ PCM1789_SOFT_MUTE, 0x00 },
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{ PCM1789_DAC_VOL_LEFT, 0xff },
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{ PCM1789_DAC_VOL_RIGHT, 0xff },
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};
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static bool pcm1789_accessible_reg(struct device *dev, unsigned int reg)
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{
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return reg >= PCM1789_MUTE_CONTROL && reg <= PCM1789_DAC_VOL_RIGHT;
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}
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static bool pcm1789_writeable_reg(struct device *dev, unsigned int reg)
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{
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return pcm1789_accessible_reg(dev, reg);
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}
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static int pcm1789_set_dai_fmt(struct snd_soc_dai *codec_dai,
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unsigned int format)
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{
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struct snd_soc_component *component = codec_dai->component;
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struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
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priv->format = format;
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return 0;
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}
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static int pcm1789_digital_mute(struct snd_soc_dai *codec_dai, int mute)
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{
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struct snd_soc_component *component = codec_dai->component;
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struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
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return regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
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PCM1789_MUTE_MASK,
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mute ? 0 : PCM1789_MUTE_MASK);
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}
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static int pcm1789_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *codec_dai)
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{
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struct snd_soc_component *component = codec_dai->component;
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struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
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int val = 0, ret;
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priv->rate = params_rate(params);
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switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_RIGHT_J:
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switch (params_width(params)) {
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case 24:
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val = 2;
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break;
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case 16:
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val = 3;
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break;
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default:
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return -EINVAL;
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}
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break;
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case SND_SOC_DAIFMT_I2S:
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switch (params_width(params)) {
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case 16:
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case 24:
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case 32:
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val = 0;
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break;
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default:
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return -EINVAL;
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}
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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switch (params_width(params)) {
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case 16:
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case 24:
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case 32:
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val = 1;
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break;
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default:
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return -EINVAL;
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}
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break;
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default:
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dev_err(component->dev, "Invalid DAI format\n");
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return -EINVAL;
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}
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ret = regmap_update_bits(priv->regmap, PCM1789_FMT_CONTROL,
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PCM1789_FMT_MASK, val);
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if (ret < 0)
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return ret;
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return 0;
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}
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static void pcm1789_work_queue(struct work_struct *work)
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{
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struct pcm1789_private *priv = container_of(work,
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struct pcm1789_private,
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work);
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/* Perform a software reset to remove codec from desynchronized state */
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if (regmap_update_bits(priv->regmap, PCM1789_MUTE_CONTROL,
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0x3 << PCM1789_MUTE_SRET, 0) < 0)
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dev_err(priv->dev, "Error while setting SRET");
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}
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static int pcm1789_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_component *component = dai->component;
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struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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schedule_work(&priv->work);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static const struct snd_soc_dai_ops pcm1789_dai_ops = {
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.set_fmt = pcm1789_set_dai_fmt,
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.hw_params = pcm1789_hw_params,
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.digital_mute = pcm1789_digital_mute,
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.trigger = pcm1789_trigger,
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};
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static const DECLARE_TLV_DB_SCALE(pcm1789_dac_tlv, -12000, 50, 1);
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static const struct snd_kcontrol_new pcm1789_controls[] = {
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SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1789_DAC_VOL_LEFT,
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PCM1789_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
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pcm1789_dac_tlv),
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};
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static const struct snd_soc_dapm_widget pcm1789_dapm_widgets[] = {
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SND_SOC_DAPM_OUTPUT("IOUTL+"),
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SND_SOC_DAPM_OUTPUT("IOUTL-"),
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SND_SOC_DAPM_OUTPUT("IOUTR+"),
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SND_SOC_DAPM_OUTPUT("IOUTR-"),
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};
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static const struct snd_soc_dapm_route pcm1789_dapm_routes[] = {
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{ "IOUTL+", NULL, "Playback" },
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{ "IOUTL-", NULL, "Playback" },
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{ "IOUTR+", NULL, "Playback" },
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{ "IOUTR-", NULL, "Playback" },
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};
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static struct snd_soc_dai_driver pcm1789_dai = {
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.name = "pcm1789-hifi",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 2,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_CONTINUOUS,
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.rate_min = 10000,
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.rate_max = 200000,
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.formats = PCM1789_FORMATS,
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},
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.ops = &pcm1789_dai_ops,
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};
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const struct regmap_config pcm1789_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = PCM1789_DAC_VOL_RIGHT,
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.reg_defaults = pcm1789_reg_defaults,
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.num_reg_defaults = ARRAY_SIZE(pcm1789_reg_defaults),
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.writeable_reg = pcm1789_writeable_reg,
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.readable_reg = pcm1789_accessible_reg,
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};
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EXPORT_SYMBOL_GPL(pcm1789_regmap_config);
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static const struct snd_soc_component_driver soc_component_dev_pcm1789 = {
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.controls = pcm1789_controls,
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.num_controls = ARRAY_SIZE(pcm1789_controls),
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.dapm_widgets = pcm1789_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(pcm1789_dapm_widgets),
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.dapm_routes = pcm1789_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(pcm1789_dapm_routes),
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.idle_bias_on = 1,
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.use_pmdown_time = 1,
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.endianness = 1,
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.non_legacy_dai_naming = 1,
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};
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int pcm1789_common_init(struct device *dev, struct regmap *regmap)
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{
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struct pcm1789_private *pcm1789;
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pcm1789 = devm_kzalloc(dev, sizeof(struct pcm1789_private),
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GFP_KERNEL);
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if (!pcm1789)
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return -ENOMEM;
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pcm1789->regmap = regmap;
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pcm1789->dev = dev;
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dev_set_drvdata(dev, pcm1789);
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pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(pcm1789->reset))
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return PTR_ERR(pcm1789->reset);
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gpiod_set_value_cansleep(pcm1789->reset, 0);
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msleep(300);
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INIT_WORK(&pcm1789->work, pcm1789_work_queue);
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return devm_snd_soc_register_component(dev, &soc_component_dev_pcm1789,
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&pcm1789_dai, 1);
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}
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EXPORT_SYMBOL_GPL(pcm1789_common_init);
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int pcm1789_common_exit(struct device *dev)
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{
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struct pcm1789_private *priv = dev_get_drvdata(dev);
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flush_work(&priv->work);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pcm1789_common_exit);
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MODULE_DESCRIPTION("ASoC PCM1789 driver");
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MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>");
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MODULE_LICENSE("GPL");
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