ALSA: emu10k1: allow high-resolution mixer controls
Add a module option to allow the GPR mixer controls to have the full
resolution of the hardware, i.e., 0...2^31-1 instead of 0...100.
Because of bugs in userspace tools like alsactl and alsamixer, this is
not yet enabled by default.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c
index 4b302d8..7a94014 100644
--- a/sound/pci/emu10k1/emufx.c
+++ b/sound/pci/emu10k1/emufx.c
@@ -35,6 +35,7 @@
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/mutex.h>
+#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/tlv.h>
@@ -50,6 +51,10 @@
#define EMU10K1_CENTER_LFE_FROM_FRONT
#endif
+static bool high_res_gpr_volume;
+module_param(high_res_gpr_volume, bool, 0444);
+MODULE_PARM_DESC(high_res_gpr_volume, "GPR mixer controls use 31-bit range.");
+
/*
* Tables
*/
@@ -296,6 +301,7 @@
/* EMU10k1/EMU10k2 DSP control db gain */
static const DECLARE_TLV_DB_SCALE(snd_emu10k1_db_scale1, -4000, 40, 1);
+static const DECLARE_TLV_DB_LINEAR(snd_emu10k1_db_linear, TLV_DB_GAIN_MUTE, 0);
static const u32 onoff_table[2] = {
0x00000000, 0x00000001
@@ -1072,10 +1078,17 @@
strcpy(ctl->id.name, name);
ctl->vcount = ctl->count = 1;
ctl->gpr[0] = gpr + 0; ctl->value[0] = defval;
- ctl->min = 0;
- ctl->max = 100;
- ctl->tlv = snd_emu10k1_db_scale1;
- ctl->translation = EMU10K1_GPR_TRANSLATION_TABLE100;
+ if (high_res_gpr_volume) {
+ ctl->min = 0;
+ ctl->max = 0x7fffffff;
+ ctl->tlv = snd_emu10k1_db_linear;
+ ctl->translation = EMU10K1_GPR_TRANSLATION_NONE;
+ } else {
+ ctl->min = 0;
+ ctl->max = 100;
+ ctl->tlv = snd_emu10k1_db_scale1;
+ ctl->translation = EMU10K1_GPR_TRANSLATION_TABLE100;
+ }
}
static void __devinit
@@ -1087,10 +1100,17 @@
ctl->vcount = ctl->count = 2;
ctl->gpr[0] = gpr + 0; ctl->value[0] = defval;
ctl->gpr[1] = gpr + 1; ctl->value[1] = defval;
- ctl->min = 0;
- ctl->max = 100;
- ctl->tlv = snd_emu10k1_db_scale1;
- ctl->translation = EMU10K1_GPR_TRANSLATION_TABLE100;
+ if (high_res_gpr_volume) {
+ ctl->min = 0;
+ ctl->max = 0x7fffffff;
+ ctl->tlv = snd_emu10k1_db_linear;
+ ctl->translation = EMU10K1_GPR_TRANSLATION_NONE;
+ } else {
+ ctl->min = 0;
+ ctl->max = 100;
+ ctl->tlv = snd_emu10k1_db_scale1;
+ ctl->translation = EMU10K1_GPR_TRANSLATION_TABLE100;
+ }
}
static void __devinit