[alsa-devel] [PATCH] ASoC: bytcr_rt5640: Allow quirk set via module option

[Takashi Iwai]

The bytcr-rt5640 driver has a few quirk setups depending on the board,
where the quirk value is set by DMI matching.  When you have a new
device to add the support, you often experience to try the different
quirk by trial-and-error.  Or, you may have a development model that
still has no proper DMI string.  In either case, you'd need to compile
the driver at each time.

This patch introduces a module option to override the quirk value on
the fly.  User can boot like snd-soc-sst-bytcr-rt5640.quirk=0x4004 to
override the default value without recompilation.  It's a raw value,
so user needs to check the source code for the meaning of each bit.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/soc/intel/boards/bytcr_rt5640.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c
index 5c7219fb3aa8..b848cbf575a1 100644
--- a/sound/soc/intel/boards/bytcr_rt5640.c
+++ b/sound/soc/intel/boards/bytcr_rt5640.c
@@ -19,6 +19,7 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
 #include <linux/device.h>
@@ -57,7 +58,9 @@ struct byt_rt5640_private {
 	struct clk *mclk;
 };
 
-static unsigned long byt_rt5640_quirk = BYT_RT5640_MCLK_EN;
+static unsigned int byt_rt5640_quirk = BYT_RT5640_MCLK_EN;
+module_param_named(quirk, byt_rt5640_quirk, int, 0444);
+MODULE_PARM_DESC(quirk, "Board-specific quirk override");
 
 static void log_quirks(struct device *dev)
 {
-- 
2.11.1