sound/soc/intel/boards/sof_cs42l42.c

Source file repositories/reference/linux-study-clean/sound/soc/intel/boards/sof_cs42l42.c

File Facts

System
Linux kernel
Corpus path
sound/soc/intel/boards/sof_cs42l42.c
Extension
.c
Size
8071 bytes
Lines
308
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
// Copyright(c) 2021 Intel Corporation.

/*
 * Intel SOF Machine Driver with Cirrus Logic CS42L42 Codec
 * and speaker codec MAX98357A
 */
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/dmi.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/sof.h>
#include <sound/soc-acpi.h>
#include <dt-bindings/sound/cs42l42.h>
#include "../common/soc-intel-quirks.h"
#include "sof_board_helpers.h"
#include "sof_maxim_common.h"

static struct snd_soc_jack_pin jack_pins[] = {
	{
		.pin    = "Headphone Jack",
		.mask   = SND_JACK_HEADPHONE,
	},
	{
		.pin    = "Headset Mic",
		.mask   = SND_JACK_MICROPHONE,
	},
};

/* Default: SSP2 */
static unsigned long sof_cs42l42_quirk = SOF_SSP_PORT_CODEC(2);

static int sof_cs42l42_init(struct snd_soc_pcm_runtime *rtd)
{
	struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_component *component = snd_soc_rtd_to_codec(rtd, 0)->component;
	struct snd_soc_jack *jack = &ctx->headset_jack;
	int ret;

	/*
	 * Headset buttons map to the google Reference headset.
	 * These can be configured by userspace.
	 */
	ret = snd_soc_card_jack_new_pins(rtd->card, "Headset Jack",
					 SND_JACK_HEADSET | SND_JACK_BTN_0 |
					 SND_JACK_BTN_1 | SND_JACK_BTN_2 |
					 SND_JACK_BTN_3,
					 jack,
					 jack_pins,
					 ARRAY_SIZE(jack_pins));
	if (ret) {
		dev_err(rtd->dev, "Headset Jack creation failed: %d\n", ret);
		return ret;
	}

	snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
	snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOLUMEUP);
	snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEDOWN);
	snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOICECOMMAND);

	ret = snd_soc_component_set_jack(component, jack, NULL);
	if (ret) {
		dev_err(rtd->dev, "Headset Jack call-back failed: %d\n", ret);
		return ret;
	}

	return ret;
};

static void sof_cs42l42_exit(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_component *component = snd_soc_rtd_to_codec(rtd, 0)->component;

	snd_soc_component_set_jack(component, NULL, NULL);
}

static int sof_cs42l42_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
	int clk_freq, ret;

Annotation

Implementation Notes