linux-kernel - [PATCH v3 1/6] ASoC: soc-acpi: add comp_ids field for machine driver matching

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Date:   Tue, 19 Oct 2021 15:59:36 +0800
From:   Brent Lu <brent.lu@...el.com>
To:     alsa-devel@...a-project.org
Cc:     Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Rander Wang <rander.wang@...el.com>,
        Paul Olaru <paul.olaru@....nxp.com>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Brent Lu <brent.lu@...el.com>,
        Mac Chiang <mac.chiang@...el.com>,
        Curtis Malainey <cujomalainey@...omium.org>,
        linux-kernel@...r.kernel.org, Yong Zhi <yong.zhi@...el.com>,
        Vamshi Krishna Gopal <vamshi.krishna.gopal@...el.com>,
        Bard Liao <bard.liao@...el.com>,
        Libin Yang <libin.yang@...el.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Gongjun Song <gongjun.song@...el.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH v3 1/6] ASoC: soc-acpi: add comp_ids field for machine driver matching

A machine driver needs to be enumerated by more than one ACPI HID if
it supports second headphone driver (i.e. rt5682 and rt5682s).
However, the id field in snd_soc_acpi_mach structure could contain
only one HID. By adding a 'comp_ids' field which can contain several
HIDs, we can enumerate a machine driver by multiple ACPI HIDs.

Signed-off-by: Brent Lu <brent.lu@...el.com>
---
 include/sound/soc-acpi.h |  3 +++
 sound/soc/soc-acpi.c     | 24 ++++++++++++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/include/sound/soc-acpi.h b/include/sound/soc-acpi.h
index 2f3fa385c092..31f4c4f9aeea 100644
--- a/include/sound/soc-acpi.h
+++ b/include/sound/soc-acpi.h
@@ -129,6 +129,8 @@ struct snd_soc_acpi_link_adr {
  * all firmware/topology related fields.
  *
  * @id: ACPI ID (usually the codec's) used to find a matching machine driver.
+ * @comp_ids: list of compatible audio codecs using the same machine driver,
+ * firmware and topology
  * @link_mask: describes required board layout, e.g. for SoundWire.
  * @links: array of link _ADR descriptors, null terminated.
  * @drv_name: machine driver name
@@ -146,6 +148,7 @@ struct snd_soc_acpi_link_adr {
 /* Descriptor for SST ASoC machine driver */
 struct snd_soc_acpi_mach {
 	const u8 id[ACPI_ID_LEN];
+	const struct snd_soc_acpi_codecs *comp_ids;
 	const u32 link_mask;
 	const struct snd_soc_acpi_link_adr *links;
 	const char *drv_name;
diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
index 395229bf5c51..2ae99b49d3f5 100644
--- a/sound/soc/soc-acpi.c
+++ b/sound/soc/soc-acpi.c
@@ -8,14 +8,34 @@
 #include <linux/module.h>
 #include <sound/soc-acpi.h>
 
+static bool snd_soc_acpi_id_present(struct snd_soc_acpi_mach *machine)
+{
+	const struct snd_soc_acpi_codecs *comp_ids = machine->comp_ids;
+	int i;
+
+	if (machine->id[0]) {
+		if (acpi_dev_present(machine->id, NULL, -1))
+			return true;
+	}
+
+	if (comp_ids) {
+		for (i = 0; i < comp_ids->num_codecs; i++) {
+			if (acpi_dev_present(comp_ids->codecs[i], NULL, -1))
+				return true;
+		}
+	}
+
+	return false;
+}
+
 struct snd_soc_acpi_mach *
 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
 {
 	struct snd_soc_acpi_mach *mach;
 	struct snd_soc_acpi_mach *mach_alt;
 
-	for (mach = machines; mach->id[0]; mach++) {
-		if (acpi_dev_present(mach->id, NULL, -1)) {
+	for (mach = machines; mach->id[0] || mach->comp_ids; mach++) {
+		if (snd_soc_acpi_id_present(mach)) {
 			if (mach->machine_quirk) {
 				mach_alt = mach->machine_quirk(mach);
 				if (!mach_alt)
-- 
2.25.1