[PATCH] ASoC: intel: add function stub when ACPI is not enabled

From: Randy Dunlap
Date: Tue Mar 29 2016 - 12:45:42 EST

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Add function stub for "sst_acpi_find_name_from_hid()"
when CONFIG_ACPI is not enabled so that the driver will build
successfully. This fixes the following build errors:

(loadable module)
ERROR: "sst_acpi_find_name_from_hid" [sound/soc/intel/boards/snd-soc-sst-bytcr-rt5640.ko] undefined!
(or built-in)
bytcr_rt5640.c:(.text+0x26fc52): undefined reference to `sst_acpi_find_name_from_hid'

Reported-by: Borislav Petkov <bp@xxxxxxxxx>
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Subhransu S. Prusty <subhransu.s.prusty@xxxxxxxxx>
Cc: Jie Yang <yang.jie@xxxxxxxxxxxxxxx>
Cc: alsa-devel@xxxxxxxxxxxxxxxx
sound/soc/intel/common/sst-acpi.h | 9 +++++++++
1 file changed, 9 insertions(+)

--- linux-next-20160308.orig/sound/soc/intel/common/sst-acpi.h
+++ linux-next-20160308/sound/soc/intel/common/sst-acpi.h
@@ -12,10 +12,19 @@

+#include <linux/kconfig.h>
+#include <linux/stddef.h>
#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]);
+inline const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
+ return NULL;

/* acpi match */
struct sst_acpi_mach *sst_acpi_find_machine(struct sst_acpi_mach *machines);