ALSA: usb-audio - Add ignore_ctl_error parameter
Added the ignore_ctl_error parameter to enable/disable the control-error
handling for mixer interfaces. It was a hard-coded ifdef, and now you
can change it more easily.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 68bbc25..b33e030 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1983,6 +1983,8 @@
device_setup - Device specific magic number (optional)
- Influence depends on the device
- Default: 0x0000
+ ignore_ctl_error - Ignore any USB-controller regarding mixer
+ interface (default: no)
This module supports multiple devices, autoprobe and hotplugging.
@@ -1991,6 +1993,9 @@
check.
NB: async_unlink=0 would cause Oops. It remains just for
debugging purpose (if any).
+ NB: ignore_ctl_error=1 may help when you get an error at accessing
+ the mixer element such as URB error -22. This happens on some
+ buggy USB device or the controller.
Module snd-usb-caiaq
--------------------
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index c91f18c..c5cf682 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -71,6 +71,7 @@
static int nrpacks = 8; /* max. number of packets per urb */
static int async_unlink = 1;
static int device_setup[SNDRV_CARDS]; /* device parameter for this card*/
+static int ignore_ctl_error;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
@@ -88,7 +89,9 @@
MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
module_param_array(device_setup, int, NULL, 0444);
MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
-
+module_param(ignore_ctl_error, bool, 0444);
+MODULE_PARM_DESC(ignore_ctl_error,
+ "Ignore errors from USB controller for mixer interfaces.");
/*
* debug the h/w constraints
@@ -3633,7 +3636,7 @@
if (err > 0) {
/* create normal USB audio interfaces */
if (snd_usb_create_streams(chip, ifnum) < 0 ||
- snd_usb_create_mixer(chip, ifnum) < 0) {
+ snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
goto __error;
}
}
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 140ba36..f3ca77f 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -223,7 +223,8 @@
__u8 request, __u8 requesttype, __u16 value, __u16 index,
void *data, __u16 size, int timeout);
-int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif);
+int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
+ int ignore_error);
void snd_usb_mixer_disconnect(struct list_head *p);
int snd_usb_create_midi_interface(struct snd_usb_audio *chip, struct usb_interface *iface,
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 6621fad..a492461 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -2014,7 +2014,8 @@
}
}
-int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif)
+int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
+ int ignore_error)
{
static struct snd_device_ops dev_ops = {
.dev_free = snd_usb_mixer_dev_free
@@ -2029,9 +2030,7 @@
return -ENOMEM;
mixer->chip = chip;
mixer->ctrlif = ctrlif;
-#ifdef IGNORE_CTL_ERROR
- mixer->ignore_ctl_error = 1;
-#endif
+ mixer->ignore_ctl_error = ignore_error;
mixer->id_elems = kcalloc(256, sizeof(*mixer->id_elems), GFP_KERNEL);
if (!mixer->id_elems) {
kfree(mixer);