ALSA: hda/tegra: compatible string as shortname (c94800a3) · Commits · 戴 / test

By default HDA sound card is registered with shortname "tegra-hda". Same driver is used across tegra platforms and it is necessary to distinguish between platforms to use platform specific settings from userspace. One such example is, hdmi port on different platforms use different alsa pcm device ID. For hdmi playback to work it should open correct pcm device depending on the platform. This patch applies shortname from first compatible string provided in root node of device tree. Userspace then can use this card name to apply specific settings. Signed-off-by:

Sameer Pujar <spujar@nvidia.com> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_tegra.c

+19 −1

Original line number	Diff line number	Diff line
		@@ -31,6 +31,7 @@
		#include <linux/of_device.h>
		#include <linux/slab.h>
		#include <linux/time.h>
		#include <linux/string.h>

		#include <sound/core.h>
		#include <sound/initval.h>
		@@ -344,6 +345,8 @@ static int hda_tegra_first_init(struct azx chip, struct platform_device pdev)
		int err;
		unsigned short gcap;
		int irq_id = platform_get_irq(pdev, 0);
		const char *sname;
		struct device_node *root;

		err = hda_tegra_init_chip(chip, pdev);
		if (err)
		@@ -401,8 +404,23 @@ static int hda_tegra_first_init(struct azx chip, struct platform_device pdev)
		return -ENODEV;
		}

		/* driver name */
		strcpy(card->driver, "tegra-hda");
		strcpy(card->shortname, "tegra-hda");

		root = of_find_node_by_path("/");
		sname = of_get_property(root, "compatible", NULL);
		of_node_put(root);
		if (!sname) {
		dev_err(card->dev,
		"failed to get compatible property from root node\n");
		return -ENODEV;
		}
		/* shortname for card */
		if (strlen(sname) > sizeof(card->shortname))
		dev_info(card->dev, "truncating shortname for card\n");
		strncpy(card->shortname, sname, sizeof(card->shortname));

		/* longname for card */
		snprintf(card->longname, sizeof(card->longname),
		"%s at 0x%lx irq %i",
		card->shortname, bus->addr, bus->irq);

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