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ASoC: Intel: common: add translation from HID to codec-name

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BIOS vendors sometimes declare multiple devices in the DSDT
table that all refer to the same HID. This is not very smart
but not illegal as long as only one device reports present with
the _STA method. The ACPI subsystem tracks each device with an
extension, e.g. 10EC5640:00 and 10EC5640:01

In the ASoC machine driver, the DAI codec name needs to refer to the
ACPI device that reported present, e.g. "i2c-10EC5640:01". The
extension will vary depending on how the BIOS is written and which
ACPI device is activated.

This patch adds a translation function that provides the codec
name from the ACPI HID to avoid any hard-coded values in the
machine driver.

Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2016-03-03 21:36:36 -06:00 committed by Mark Brown
parent cab4738502
commit 1fdb7c14a2
2 changed files with 36 additions and 0 deletions
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3
sound/soc/intel/common/sst-acpi.h
View file

@ -14,6 +14,9 @@
#include <linux/acpi.h>
/* translation fron HID to I2C name, needed for DAI codec_name */
const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN]);
/* acpi match */
struct sst_acpi_mach *sst_acpi_find_machine(struct sst_acpi_mach *machines);

33
sound/soc/intel/common/sst-match-acpi.c
View file

@ -16,6 +16,39 @@
#include "sst-acpi.h"
static acpi_status sst_acpi_find_name(acpi_handle handle, u32 level,
void *context, void **ret)
{
struct acpi_device *adev;
const char *name = NULL;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (adev->status.present && adev->status.functional) {
name = acpi_dev_name(adev);
*(const char **)ret = name;
return AE_CTRL_TERMINATE;
}
return AE_OK;
}
const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
{
const char *name = NULL;
acpi_status status;
status = acpi_get_devices(hid, sst_acpi_find_name, NULL,
(void **)&name);
if (ACPI_FAILURE(status) || name[0] == '\0')
return NULL;
return name;
}
EXPORT_SYMBOL_GPL(sst_acpi_find_name_from_hid);
static acpi_status sst_acpi_mach_match(acpi_handle handle, u32 level,
void *context, void **ret)
{