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ALSA: usb-audio: Fix missing autopm for MIDI input
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The commit [88a8516: ALSA: usbaudio: implement USB autosuspend] added
the support of autopm for USB MIDI output, but it didn't take the MIDI
input into account.

This patch adds the following for fixing the autopm:
- Manage the URB start at the first MIDI input stream open, instead of
  the time of instance creation
- Move autopm code to the common substream_open()
- Make snd_usbmidi_input_start/_stop() more robust and add the running
  state check

Reviewd-by: Clemens Ladisch <clemens@ladisch.de>
Tested-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@tiwai
tiwai committed Dec 4, 2012
1 parent 59866da commit f5f1654
Showing 1 changed file with 46 additions and 42 deletions.
88 changes: 46 additions & 42 deletions sound/usb/midi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -126,8 +126,10 @@ struct snd_usb_midi {
struct snd_usb_midi_in_endpoint *in;
} endpoints[MIDI_MAX_ENDPOINTS];
unsigned long input_triggered;
unsigned int opened;
bool autopm_reference;
unsigned int opened[2];
unsigned char disconnected;
unsigned char input_running;

struct snd_kcontrol *roland_load_ctl;
};
Expand All @@ -149,7 +151,6 @@ struct snd_usb_midi_out_endpoint {
struct snd_usb_midi_out_endpoint* ep;
struct snd_rawmidi_substream *substream;
int active;
bool autopm_reference;
uint8_t cable; /* cable number << 4 */
uint8_t state;
#define STATE_UNKNOWN 0
Expand Down Expand Up @@ -1034,44 +1035,65 @@ static void update_roland_altsetting(struct snd_usb_midi* umidi)
snd_usbmidi_input_start(&umidi->list);
}

static void substream_open(struct snd_rawmidi_substream *substream, int open)
static int substream_open(struct snd_rawmidi_substream *substream, int dir,
int open)
{
struct snd_usb_midi* umidi = substream->rmidi->private_data;
struct snd_kcontrol *ctl;
int err;

down_read(&umidi->disc_rwsem);
if (umidi->disconnected) {
up_read(&umidi->disc_rwsem);
return;
return open ? -ENODEV : 0;
}

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->card,
if (!umidi->opened[0] && !umidi->opened[1]) {
err = usb_autopm_get_interface(umidi->iface);
umidi->autopm_reference = err >= 0;
if (err < 0 && err != -EACCES) {
mutex_unlock(&umidi->mutex);
up_read(&umidi->disc_rwsem);
return -EIO;
}
if (umidi->roland_load_ctl) {
ctl = umidi->roland_load_ctl;
ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
snd_ctl_notify(umidi->card,
SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
update_roland_altsetting(umidi);
update_roland_altsetting(umidi);
}
}
umidi->opened[dir]++;
if (umidi->opened[1])
snd_usbmidi_input_start(&umidi->list);
} 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->card,
umidi->opened[dir]--;
if (!umidi->opened[1])
snd_usbmidi_input_stop(&umidi->list);
if (!umidi->opened[0] && !umidi->opened[1]) {
if (umidi->roland_load_ctl) {
ctl = umidi->roland_load_ctl;
ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
snd_ctl_notify(umidi->card,
SNDRV_CTL_EVENT_MASK_INFO, &ctl->id);
}
if (umidi->autopm_reference)
usb_autopm_put_interface(umidi->iface);
}
}
mutex_unlock(&umidi->mutex);
up_read(&umidi->disc_rwsem);
return 0;
}

static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
{
struct snd_usb_midi* umidi = substream->rmidi->private_data;
struct usbmidi_out_port* port = NULL;
int i, j;
int err;

for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
if (umidi->endpoints[i].out)
Expand All @@ -1085,33 +1107,14 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
return -ENXIO;
}

down_read(&umidi->disc_rwsem);
if (umidi->disconnected) {
up_read(&umidi->disc_rwsem);
return -ENODEV;
}
err = usb_autopm_get_interface(umidi->iface);
port->autopm_reference = err >= 0;
up_read(&umidi->disc_rwsem);
if (err < 0 && err != -EACCES)
return -EIO;
substream->runtime->private_data = port;
port->state = STATE_UNKNOWN;
substream_open(substream, 1);
return 0;
return substream_open(substream, 0, 1);
}

static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
{
struct snd_usb_midi* umidi = substream->rmidi->private_data;
struct usbmidi_out_port *port = substream->runtime->private_data;

substream_open(substream, 0);
down_read(&umidi->disc_rwsem);
if (!umidi->disconnected && port->autopm_reference)
usb_autopm_put_interface(umidi->iface);
up_read(&umidi->disc_rwsem);
return 0;
return substream_open(substream, 0, 0);
}

static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
Expand Down Expand Up @@ -1164,14 +1167,12 @@ 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;
return substream_open(substream, 1, 1);
}

static int snd_usbmidi_input_close(struct snd_rawmidi_substream *substream)
{
substream_open(substream, 0);
return 0;
return substream_open(substream, 1, 0);
}

static void snd_usbmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
Expand Down Expand Up @@ -2080,12 +2081,15 @@ void snd_usbmidi_input_stop(struct list_head* p)
unsigned int i, j;

umidi = list_entry(p, struct snd_usb_midi, list);
if (!umidi->input_running)
return;
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
struct snd_usb_midi_endpoint* ep = &umidi->endpoints[i];
if (ep->in)
for (j = 0; j < INPUT_URBS; ++j)
usb_kill_urb(ep->in->urbs[j]);
}
umidi->input_running = 0;
}

static void snd_usbmidi_input_start_ep(struct snd_usb_midi_in_endpoint* ep)
Expand All @@ -2110,8 +2114,11 @@ void snd_usbmidi_input_start(struct list_head* p)
int i;

umidi = list_entry(p, struct snd_usb_midi, list);
if (umidi->input_running || !umidi->opened[1])
return;
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
umidi->input_running = 1;
}

/*
Expand Down Expand Up @@ -2250,9 +2257,6 @@ int snd_usbmidi_create(struct snd_card *card,
}

list_add_tail(&umidi->list, midi_list);

for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
snd_usbmidi_input_start_ep(umidi->endpoints[i].in);
return 0;
}

Expand Down

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