ALSA: hda: cs35l41: Save Subsystem ID inside CS35L41 Driver

The Subsystem ID is read from the HDA driver, and will
be used by the CS35L41 driver to be able to uniquely
identify the laptop, which is required to be able to
define firmware to be used by specific models.

Signed-off-by: Stefan Binding <[e-mail]>
Signed-off-by: Vitaly Rodionov <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/pci/hda/cs35l41_hda.c

···
 		return -EBUSY;
 
 	comps->dev = dev;
+	if (!cs35l41->acpi_subsystem_id)
+		cs35l41->acpi_subsystem_id = devm_kasprintf(dev, GFP_KERNEL, "%.8x",
+							    comps->codec->core.subsystem_id);
 	cs35l41->codec = comps->codec;
 	strscpy(comps->name, dev_name(dev), sizeof(comps->name));
 	comps->playback_hook = cs35l41_hda_playback_hook;

sound/pci/hda/cs35l41_hda.h

···
 	int channel_index;
 	unsigned volatile long irq_errors;
 	const char *amp_name;
+	const char *acpi_subsystem_id;
 	struct mutex fw_mutex;
 	struct regmap_irq_chip_data *irq_data;
 	bool firmware_running;