ALSA: usb-audio - Added functionality for E-mu 0404USB/0202USB/TrackerPre

Added functionality:
1) Extension Units support (all XU settings now available at alsamixer,
   kmix, etc):
- "AnalogueIn soft limiter" switch;
- "Sample rate" selector (values 0,1,2,3,4,5 corresponds to 44.1 48 ...
  192 kHz);
- "DigitalIn CLK source" selector (internal/external) (**);
- "DigitalOut format SPDIF/AC3" switch (**);
(**)E-mu-0404usb only.

2) Automatic device sample rate adjustment depending on substream
   samplerate for both capture and playback substream.

[minor coding-style fixes by tiwai]

Signed-off-by: Sergiy Kovalchuk <cnb_zerg@yahoo.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 71 insertions, 4 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index c998220b99c6..f5596cfdbde1 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -186,6 +186,21 @@ enum {
         USB_PROC_DCR_RELEASE = 6,
 };
 
+/*E-mu 0202(0404) eXtension Unit(XU) control*/
+enum {
+        USB_XU_CLOCK_RATE               = 0xe301,
+        USB_XU_CLOCK_SOURCE             = 0xe302,
+        USB_XU_DIGITAL_IO_STATUS        = 0xe303,
+        USB_XU_DEVICE_OPTIONS           = 0xe304,
+        USB_XU_DIRECT_MONITORING        = 0xe305,
+        USB_XU_METERING                 = 0xe306
+};
+enum {
+        USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
+        USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
+        USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
+        USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
+};
 
 /*
  * manual mapping of mixer names
@@ -1330,7 +1345,32 @@ static struct procunit_info procunits[] = {
         { USB_PROC_DCR, "DCR", dcr_proc_info },
         { 0 },
 };
-
+/*
+ * predefined data for extension units
+ */
+static struct procunit_value_info clock_rate_xu_info[] = {
+       { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
+       { 0 }
+};
+static struct procunit_value_info clock_source_xu_info[] = {
+        { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
+        { 0 }
+};
+static struct procunit_value_info spdif_format_xu_info[] = {
+        { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
+        { 0 }
+};
+static struct procunit_value_info soft_limit_xu_info[] = {
+        { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
+        { 0 }
+};
+static struct procunit_info extunits[] = {
+        { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
+        { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
+        { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
+        { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
+        { 0 }
+};
 /*
  * build a processing/extension unit
  */
@@ -1391,8 +1431,18 @@ static int build_audio_procunit(struct mixer_build *state, int unitid, unsigned
                         cval->max = dsc[15];
                         cval->res = 1;
                         cval->initialized = 1;
-                } else
-                        get_min_max(cval, valinfo->min_value);
+                } else {
+                        if (type == USB_XU_CLOCK_RATE) {
+                                /* E-Mu USB 0404/0202/TrackerPre
+                                 * samplerate control quirk
+                                 */
+                                cval->min = 0;
+                                cval->max = 5;
+                                cval->res = 1;
+                                cval->initialized = 1;
+                        } else
+                                get_min_max(cval, valinfo->min_value);
+                }
 
                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
                 if (! kctl) {
@@ -1433,7 +1483,7 @@ static int parse_audio_processing_unit(struct mixer_build *state, int unitid, un
 
 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, unsigned char *desc)
 {
-        return build_audio_procunit(state, unitid, desc, NULL, "Extension Unit");
+        return build_audio_procunit(state, unitid, desc, extunits, "Extension Unit");
 }
 
 
@@ -2109,6 +2159,23 @@ static int snd_xonar_u1_controls_create(struct usb_mixer_interface *mixer)
         return 0;
 }
 
+void snd_emuusb_set_samplerate(struct snd_usb_audio *chip,
+                unsigned char samplerate_id)
+{
+         struct usb_mixer_interface *mixer;
+         struct usb_mixer_elem_info *cval;
+         int unitid = 12; /* SamleRate ExtensionUnit ID */
+
+         list_for_each_entry(mixer, &chip->mixer_list, list) {
+                 cval = mixer->id_elems[unitid];
+                 if (cval) {
+                        set_cur_ctl_value(cval, cval->control << 8, samplerate_id);
+                        snd_usb_mixer_notify_id(mixer, unitid);
+                 }
+                 break;
+         }
+}
+
 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
                          int ignore_error)
 {