linux-kernel - Re: [PATCH 10/11] hda: cs35l41: Add support for CS35L41 in HDA systems

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Date:   Tue, 23 Nov 2021 17:52:34 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Lucas Tanure <tanureal@...nsource.cirrus.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        "Liam Girdwood" <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Kailang Yang <kailang@...ltek.com>,
        Shuming Fan <shumingf@...ltek.com>,
        "Pierre-Louis Bossart" <pierre-louis.bossart@...ux.intel.com>,
        David Rhodes <david.rhodes@...rus.com>,
        Vitaly Rodionov <vitalyr@...nsource.cirrus.com>,
        Jeremy Szu <jeremy.szu@...onical.com>,
        Hui Wang <hui.wang@...onical.com>,
        Werner Sembach <wse@...edocomputers.com>,
        Chris Chiu <chris.chiu@...onical.com>,
        Cameron Berkenpas <cam@...-zeon.de>,
        Sami Loone <sami@...ne.fi>, Elia Devito <eliadevito@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Jack Yu <jack.yu@...ltek.com>, "Arnd Bergmann" <arnd@...db.de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        <alsa-devel@...a-project.org>, <linux-acpi@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        <platform-driver-x86@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/11] hda: cs35l41: Add support for CS35L41 in HDA systems

On Tue, 23 Nov 2021 17:31:48 +0100,
Lucas Tanure wrote:
> 
> --- a/sound/pci/hda/Makefile
> +++ b/sound/pci/hda/Makefile
> @@ -13,25 +13,27 @@ snd-hda-codec-$(CONFIG_SND_HDA_INPUT_BEEP) += hda_beep.o
>  CFLAGS_hda_controller.o := -I$(src)
>  CFLAGS_hda_intel.o := -I$(src)
>  
> -snd-hda-codec-generic-objs :=	hda_generic.o
> -snd-hda-codec-realtek-objs :=	patch_realtek.o
> -snd-hda-codec-cmedia-objs :=	patch_cmedia.o
> -snd-hda-codec-analog-objs :=	patch_analog.o
> -snd-hda-codec-idt-objs :=	patch_sigmatel.o
> -snd-hda-codec-si3054-objs :=	patch_si3054.o
> -snd-hda-codec-cirrus-objs :=	patch_cirrus.o
> -snd-hda-codec-cs8409-objs :=	patch_cs8409.o patch_cs8409-tables.o
> -snd-hda-codec-ca0110-objs :=	patch_ca0110.o
> -snd-hda-codec-ca0132-objs :=	patch_ca0132.o
> -snd-hda-codec-conexant-objs :=	patch_conexant.o
> -snd-hda-codec-via-objs :=	patch_via.o
> -snd-hda-codec-hdmi-objs :=	patch_hdmi.o hda_eld.o
> +snd-hda-codec-generic-objs :=		hda_generic.o

You don't need to change other lines because of the newly added driver
below...

> +snd-hda-codec-cs35l41-i2c-objs :=	cs35l41_hda_i2c.o cs35l41_hda.o ../../soc/codecs/cs35l41-lib.o

Linking the object in a different level of directory is too ugly and
would be problematic if multiple drivers want the cs35l41-lib stuff.
IMO, it's better to make symbols in cs35l41-lib exported and select
the corresponding Kconfig from HD-audio driver.

And, snd-hda-codec-cs35l41-i2c is not really a codec driver.  It's
rather some bridge for i2c over HD-audio.  So, better to avoid
snd-hda-codec-* but have some different name.  Otherwise people may
misunderstand.

> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
(snip)
> @@ -6497,6 +6502,98 @@ static void alc287_fixup_legion_15imhg05_speakers(struct hda_codec *codec,
>  	}
>  }
>  
> +static int comp_match_dev_name(struct device *dev, void *data)
> +{
> +	if (strcmp(dev_name(dev), data) == 0)
> +		return 1;
> +
> +	return 0;
> +}
> +
> +static int find_comp_by_dev_name(struct alc_spec *spec, const char *name)
> +{
> +	int i;
> +
> +	for (i = 0; i < HDA_MAX_COMPONENTS; i++) {
> +		if (strcmp(spec->comps[i].name, name) == 0)
> +			return i;
> +	}
> +
> +	return -ENODEV;
> +}
> +
> +static int comp_bind(struct device *dev)
> +{
> +	struct hda_codec *codec = dev_to_hda_codec(dev);
> +	struct alc_spec *spec = codec->spec;
> +
> +	return component_bind_all(dev, spec->comps);
> +}
> +
> +static void comp_unbind(struct device *dev)
> +{
> +	struct hda_codec *codec = dev_to_hda_codec(dev);
> +	struct alc_spec *spec = codec->spec;
> +
> +	component_unbind_all(dev, spec->comps);
> +}
> +
> +static const struct component_master_ops comp_master_ops = {
> +	.bind = comp_bind,
> +	.unbind = comp_unbind,
> +};
> +
> +void alc287_legion_16achg6_playback_hook(struct hda_pcm_stream *hinfo, struct hda_codec *codec,
> +					 struct snd_pcm_substream *sub, int action)
> +{
> +	struct alc_spec *spec = codec->spec;
> +	unsigned int rx_slot;
> +	int i = 0;
> +
> +	switch (action) {
> +	case HDA_GEN_PCM_ACT_PREPARE:
> +		rx_slot = 0;
> +		i = find_comp_by_dev_name(spec, "i2c-CLSA0100:00-cs35l41-hda.0");
> +		if (i >= 0)
> +			spec->comps[i].set_channel_map(spec->comps[i].dev, 0, NULL, 1, &rx_slot);
> +
> +		rx_slot = 1;
> +		i = find_comp_by_dev_name(spec, "i2c-CLSA0100:00-cs35l41-hda.1");
> +		if (i >= 0)
> +			spec->comps[i].set_channel_map(spec->comps[i].dev, 0, NULL, 1, &rx_slot);
> +		break;
> +	}
> +
> +	for (i = 0; i < HDA_MAX_COMPONENTS; i++) {
> +		if (spec->comps[i].dev)
> +			spec->comps[i].playback_hook(spec->comps[i].dev, action);
> +	}
> +
> +
> +}
> +
> +static void alc287_fixup_legion_16achg6_speakers(struct hda_codec *codec,
> +						 const struct hda_fixup *fix, int action)
> +{
> +	struct device *dev = hda_codec_dev(codec);
> +	struct alc_spec *spec = codec->spec;
> +	int ret;
> +
> +	switch (action) {
> +	case HDA_FIXUP_ACT_PRE_PROBE:
> +		component_match_add(dev, &spec->match, comp_match_dev_name,
> +				    "i2c-CLSA0100:00-cs35l41-hda.0");
> +		component_match_add(dev, &spec->match, comp_match_dev_name,
> +				    "i2c-CLSA0100:00-cs35l41-hda.1");
> +		ret = component_master_add_with_match(dev, &comp_master_ops, spec->match);
> +		if (ret)
> +			codec_err(codec, "Fail to register component aggregator %d\n", ret);
> +		else
> +			spec->gen.pcm_playback_hook = alc287_legion_16achg6_playback_hook;
> +		break;
> +	}
> +}
> +

Those are needed only if the new cs35l41 stuff is enabled, so they can
be wrapped with #if IS_REACHABLE(xxx).


thanks,

Takashi