ALSA: usb-audio: Tascam US-16x08 DSP mixer quirk

Add mixer quirk for Tascam US-16x08 usb interface.
Even that this is an usb compliant device,
the input channels and DSP functions (EQ/Compressor) aren't accessible
by default.
Signed-off-by: Detlef Urban <onkel@paraair.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/Makefile

@@ -10,6 +10,7 @@ snd-usb-audio-objs := 	card.o \
 			mixer.o \
 			mixer_quirks.o \
 			mixer_scarlett.o \
+			mixer_us16x08.o \
 			pcm.o \
 			proc.o \
 			quirks.o \

sound/usb/mixer_quirks.c

@@ -43,6 +43,7 @@
 #include "mixer.h"
 #include "mixer_quirks.h"
 #include "mixer_scarlett.h"
+#include "mixer_us16x08.h"
 #include "helper.h"
 
 extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
@@ -1729,6 +1730,10 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 		return err;
 
 	switch (mixer->chip->usb_id) {
+	/* Tascam US-16x08 */
+	case USB_ID(0x0644, 0x8047):
+		err = snd_us16x08_controls_create(mixer);
+		break;
 	case USB_ID(0x041e, 0x3020):
 	case USB_ID(0x041e, 0x3040):
 	case USB_ID(0x041e, 0x3042):

sound/usb/mixer_us16x08.h

+#ifndef __USB_MIXER_US16X08_H
+#define __USB_MIXER_US16X08_H
+
+#define SND_US16X08_MAX_CHANNELS 16
+
+/* define some bias, cause some alsa-mixers wont work with
+ * negative ranges or if mixer-min != 0
+ */
+#define SND_US16X08_NO_BIAS 0
+#define SND_US16X08_FADER_BIAS 127
+#define SND_US16X08_EQ_HIGHFREQ_BIAS 0x20
+#define SND_US16X08_COMP_THRESHOLD_BIAS 0x20
+#define SND_US16X08_COMP_ATTACK_BIAS 2
+#define SND_US16X08_COMP_RELEASE_BIAS 1
+
+/* get macro for components of kcontrol private_value */
+#define SND_US16X08_KCBIAS(x) (((x)->private_value >> 24) & 0xff)
+#define SND_US16X08_KCSTEP(x) (((x)->private_value >> 16) & 0xff)
+#define SND_US16X08_KCMIN(x) (((x)->private_value >> 8) & 0xff)
+#define SND_US16X08_KCMAX(x) (((x)->private_value >> 0) & 0xff)
+/* set macro for kcontrol private_value */
+#define SND_US16X08_KCSET(bias, step, min, max)  \
+	(((bias) << 24) | ((step) << 16) | ((min) << 8) | (max))
+
+/* the URB request/type to control Tascam mixers */
+#define SND_US16X08_URB_REQUEST 0x1D
+#define SND_US16X08_URB_REQUESTTYPE 0x40
+
+/* the URB params to retrieve meter ranges */
+#define SND_US16X08_URB_METER_REQUEST       0x1e
+#define SND_US16X08_URB_METER_REQUESTTYPE   0xc0
+
+#define MUA0(x, y) ((x)[(y) * 10 + 4])
+#define MUA1(x, y) ((x)[(y) * 10 + 5])
+#define MUA2(x, y) ((x)[(y) * 10 + 6])
+#define MUB0(x, y) ((x)[(y) * 10 + 7])
+#define MUB1(x, y) ((x)[(y) * 10 + 8])
+#define MUB2(x, y) ((x)[(y) * 10 + 9])
+#define MUC0(x, y) ((x)[(y) * 10 + 10])
+#define MUC1(x, y) ((x)[(y) * 10 + 11])
+#define MUC2(x, y) ((x)[(y) * 10 + 12])
+#define MUC3(x, y) ((x)[(y) * 10 + 13])
+
+/* Common Channel control IDs */
+#define SND_US16X08_ID_BYPASS 0x45
+#define SND_US16X08_ID_BUSS_OUT 0x44
+#define SND_US16X08_ID_PHASE 0x85
+#define SND_US16X08_ID_MUTE 0x83
+#define SND_US16X08_ID_FADER 0x81
+#define SND_US16X08_ID_PAN 0x82
+#define SND_US16X08_ID_METER 0xB1
+
+#define SND_US16X08_ID_EQ_BAND_COUNT 4
+#define SND_US16X08_ID_EQ_PARAM_COUNT 4
+
+/* EQ level IDs */
+#define SND_US16X08_ID_EQLOWLEVEL 0x01
+#define SND_US16X08_ID_EQLOWMIDLEVEL 0x02
+#define SND_US16X08_ID_EQHIGHMIDLEVEL 0x03
+#define SND_US16X08_ID_EQHIGHLEVEL 0x04
+
+/* EQ frequence IDs */
+#define SND_US16X08_ID_EQLOWFREQ 0x11
+#define SND_US16X08_ID_EQLOWMIDFREQ 0x12
+#define SND_US16X08_ID_EQHIGHMIDFREQ 0x13
+#define SND_US16X08_ID_EQHIGHFREQ 0x14
+
+/* EQ width IDs */
+#define SND_US16X08_ID_EQLOWMIDWIDTH 0x22
+#define SND_US16X08_ID_EQHIGHMIDWIDTH 0x23
+
+#define SND_US16X08_ID_EQENABLE 0x30
+
+#define EQ_STORE_BAND_IDX(x) ((x) & 0xf)
+#define EQ_STORE_PARAM_IDX(x) (((x) & 0xf0) >> 4)
+
+#define SND_US16X08_ID_ROUTE 0x00
+
+/* Compressor Ids */
+#define SND_US16X08_ID_COMP_BASE	0x32
+#define SND_US16X08_ID_COMP_THRESHOLD	SND_US16X08_ID_COMP_BASE
+#define SND_US16X08_ID_COMP_RATIO	(SND_US16X08_ID_COMP_BASE + 1)
+#define SND_US16X08_ID_COMP_ATTACK	(SND_US16X08_ID_COMP_BASE + 2)
+#define SND_US16X08_ID_COMP_RELEASE	(SND_US16X08_ID_COMP_BASE + 3)
+#define SND_US16X08_ID_COMP_GAIN	(SND_US16X08_ID_COMP_BASE + 4)
+#define SND_US16X08_ID_COMP_SWITCH	(SND_US16X08_ID_COMP_BASE + 5)
+#define SND_US16X08_ID_COMP_COUNT	6
+
+#define COMP_STORE_IDX(x) ((x) - SND_US16X08_ID_COMP_BASE)
+
+struct snd_us16x08_eq_store {
+	u8 val[SND_US16X08_ID_EQ_BAND_COUNT][SND_US16X08_ID_EQ_PARAM_COUNT]
+		[SND_US16X08_MAX_CHANNELS];
+};
+
+struct snd_us16x08_comp_store {
+	u8 val[SND_US16X08_ID_COMP_COUNT][SND_US16X08_MAX_CHANNELS];
+};
+
+struct snd_us16x08_meter_store {
+	int meter_level[SND_US16X08_MAX_CHANNELS];
+	int master_level[2]; /* level of meter for master output */
+	int comp_index; /* round trip channel selector */
+	int comp_active_index; /* channel select from user space mixer */
+	int comp_level[16]; /* compressor reduction level */
+	struct snd_us16x08_comp_store *comp_store;
+};
+
+struct snd_us16x08_control_params {
+	struct snd_kcontrol_new *kcontrol_new;
+	int control_id;
+	int type;
+	int num_channels;
+	const char *name;
+	void (*freeer)(struct snd_kcontrol *kctl);
+	int default_val;
+};
+
+#define snd_us16x08_switch_info snd_ctl_boolean_mono_info
+
+int snd_us16x08_controls_create(struct usb_mixer_interface *mixer);
+#endif /* __USB_MIXER_US16X08_H */