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authorClemens Ladisch <clemens@ladisch.de>2009-10-22 09:06:19 +0200
committerTakashi Iwai <tiwai@suse.de>2009-11-24 10:19:49 +0100
commit96f61d9ade82f3e9503df36809175325e8f5eaca (patch)
treef66c2359f060be40f91dab32a49c2f4320f3edad /sound/usb
parent88cdca9c7376f2220171d09dfc2f9e41b4834435 (diff)
sound: usb-audio: allow switching altsetting on Roland USB MIDI devices
Add a mixer control to select between the two altsettings on Roland USB MIDI devices where the input endpoint is either bulk or interrupt. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/usbmidi.c107
1 files changed, 106 insertions, 1 deletions
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index e5b06899637..80b2845bc48 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1,7 +1,7 @@
/*
* usbmidi.c - ALSA USB MIDI driver
*
- * Copyright (c) 2002-2007 Clemens Ladisch
+ * Copyright (c) 2002-2009 Clemens Ladisch
* All rights reserved.
*
* Based on the OSS usb-midi driver by NAGANO Daisuke,
@@ -47,6 +47,7 @@
#include <linux/usb.h>
#include <linux/wait.h>
#include <sound/core.h>
+#include <sound/control.h>
#include <sound/rawmidi.h>
#include <sound/asequencer.h>
#include "usbaudio.h"
@@ -109,13 +110,17 @@ struct snd_usb_midi {
struct list_head list;
struct timer_list error_timer;
spinlock_t disc_lock;
+ struct mutex mutex;
struct snd_usb_midi_endpoint {
struct snd_usb_midi_out_endpoint *out;
struct snd_usb_midi_in_endpoint *in;
} endpoints[MIDI_MAX_ENDPOINTS];
unsigned long input_triggered;
+ unsigned int opened;
unsigned char disconnected;
+
+ struct snd_kcontrol *roland_load_ctl;
};
struct snd_usb_midi_out_endpoint {
@@ -879,6 +884,50 @@ static struct usb_protocol_ops snd_usbmidi_emagic_ops = {
};
+static void update_roland_altsetting(struct snd_usb_midi* umidi)
+{
+ struct usb_interface *intf;
+ struct usb_host_interface *hostif;
+ struct usb_interface_descriptor *intfd;
+ int is_light_load;
+
+ intf = umidi->iface;
+ is_light_load = intf->cur_altsetting != intf->altsetting;
+ if (umidi->roland_load_ctl->private_value == is_light_load)
+ return;
+ hostif = &intf->altsetting[umidi->roland_load_ctl->private_value];
+ intfd = get_iface_desc(hostif);
+ snd_usbmidi_input_stop(&umidi->list);
+ usb_set_interface(umidi->chip->dev, intfd->bInterfaceNumber,
+ intfd->bAlternateSetting);
+ snd_usbmidi_input_start(&umidi->list);
+}
+
+static void substream_open(struct snd_rawmidi_substream *substream, int open)
+{
+ struct snd_usb_midi* umidi = substream->rmidi->private_data;
+ struct snd_kcontrol *ctl;
+
+ mutex_lock(&umidi->mutex);
+ if (open) {
+ if (umidi->opened++ == 0 && umidi->roland_load_ctl) {
+ ctl = umidi->roland_load_ctl;
+ ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+ snd_ctl_notify(umidi->chip->card,
+ SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
+ update_roland_altsetting(umidi);
+ }
+ } else {
+ if (--umidi->opened == 0 && umidi->roland_load_ctl) {
+ ctl = umidi->roland_load_ctl;
+ ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
+ snd_ctl_notify(umidi->chip->card,
+ SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
+ }
+ }
+ mutex_unlock(&umidi->mutex);
+}
+
static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
{
struct snd_usb_midi* umidi = substream->rmidi->private_data;
@@ -898,11 +947,13 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
}
substream->runtime->private_data = port;
port->state = STATE_UNKNOWN;
+ substream_open(substream, 1);
return 0;
}
static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
{
+ substream_open(substream, 0);
return 0;
}
@@ -954,11 +1005,13 @@ static void snd_usbmidi_output_drain(struct snd_rawmidi_substream *substream)
static int snd_usbmidi_input_open(struct snd_rawmidi_substream *substream)
{
+ substream_open(substream, 1);
return 0;
}
static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
{
+ substream_open(substream, 0);
return 0;
}
@@ -1163,6 +1216,7 @@ static void snd_usbmidi_free(struct snd_usb_midi* umidi)
if (ep->in)
snd_usbmidi_in_endpoint_delete(ep->in);
}
+ mutex_destroy(&umidi->mutex);
kfree(umidi);
}
@@ -1524,6 +1578,52 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi,
return 0;
}
+static int roland_load_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *info)
+{
+ static const char *const names[] = { "High Load", "Light Load" };
+
+ info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+ info->count = 1;
+ info->value.enumerated.items = 2;
+ if (info->value.enumerated.item > 1)
+ info->value.enumerated.item = 1;
+ strcpy(info->value.enumerated.name, names[info->value.enumerated.item]);
+ return 0;
+}
+
+static int roland_load_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *value)
+{
+ value->value.enumerated.item[0] = kcontrol->private_value;
+ return 0;
+}
+
+static int roland_load_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *value)
+{
+ struct snd_usb_midi* umidi = kcontrol->private_data;
+ int changed;
+
+ if (value->value.enumerated.item[0] > 1)
+ return -EINVAL;
+ mutex_lock(&umidi->mutex);
+ changed = value->value.enumerated.item[0] != kcontrol->private_value;
+ if (changed)
+ kcontrol->private_value = value->value.enumerated.item[0];
+ mutex_unlock(&umidi->mutex);
+ return changed;
+}
+
+static struct snd_kcontrol_new roland_load_ctl = {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "MIDI Input Mode",
+ .info = roland_load_info,
+ .get = roland_load_get,
+ .put = roland_load_put,
+ .private_value = 1,
+};
+
/*
* On Roland devices, use the second alternate setting to be able to use
* the interrupt input endpoint.
@@ -1549,6 +1649,10 @@ static void snd_usbmidi_switch_roland_altsetting(struct snd_usb_midi* umidi)
intfd->bAlternateSetting);
usb_set_interface(umidi->chip->dev, intfd->bInterfaceNumber,
intfd->bAlternateSetting);
+
+ umidi->roland_load_ctl = snd_ctl_new1(&roland_load_ctl, umidi);
+ if (snd_ctl_add(umidi->chip->card, umidi->roland_load_ctl) < 0)
+ umidi->roland_load_ctl = NULL;
}
/*
@@ -1834,6 +1938,7 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
umidi->usb_protocol_ops = &snd_usbmidi_standard_ops;
init_timer(&umidi->error_timer);
spin_lock_init(&umidi->disc_lock);
+ mutex_init(&umidi->mutex);
umidi->error_timer.function = snd_usbmidi_error_timer;
umidi->error_timer.data = (unsigned long)umidi;