This is for mixer/control application in user land. The application can lock/unlock kernel streaming or get notification at starting kernel streaming to use hwdep interface.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- include/uapi/sound/asound.h | 3 +- include/uapi/sound/firewire.h | 1 + sound/firewire/Kconfig | 1 + sound/firewire/bebob/Makefile | 2 +- sound/firewire/bebob/bebob.c | 5 + sound/firewire/bebob/bebob.h | 13 +++ sound/firewire/bebob/bebob_hwdep.c | 207 ++++++++++++++++++++++++++++++++++++ sound/firewire/bebob/bebob_midi.c | 10 ++ sound/firewire/bebob/bebob_pcm.c | 14 ++- sound/firewire/bebob/bebob_stream.c | 39 +++++++ 10 files changed, 290 insertions(+), 5 deletions(-) create mode 100644 sound/firewire/bebob/bebob_hwdep.c
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 9fc6219..d8bc723 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -94,9 +94,10 @@ enum { SNDRV_HWDEP_IFACE_HDA, /* HD-audio */ SNDRV_HWDEP_IFACE_USB_STREAM, /* direct access to usb stream */ SNDRV_HWDEP_IFACE_FW_DICE, /* TC DICE FireWire device */ + SNDRV_HWDEP_IFACE_FW_BEBOB, /* BridgeCo BeBoB based Device */
/* Don't forget to change the following: */ - SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_DICE + SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_BEBOB };
struct snd_hwdep_info { diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h index 59f5961..c600b143 100644 --- a/include/uapi/sound/firewire.h +++ b/include/uapi/sound/firewire.h @@ -34,6 +34,7 @@ union snd_firewire_event { #define SNDRV_FIREWIRE_IOCTL_UNLOCK _IO('H', 0xfa)
#define SNDRV_FIREWIRE_TYPE_DICE 1 +#define SNDRV_FIREWIRE_TYPE_BEBOB 2 /* Fireworks, AV/C, RME, MOTU, ... */
struct snd_firewire_get_info { diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig index 7641772..c46578e 100644 --- a/sound/firewire/Kconfig +++ b/sound/firewire/Kconfig @@ -65,6 +65,7 @@ config SND_BEBOB tristate "BridgeCo BeBoB chipset support" select SND_RAWMIDI select SND_PCM + select SND_HWDEP select SND_FIREWIRE_LIB help Say Y here to include support for FireWire devices based diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile index 30e79e6..81e14fa 100644 --- a/sound/firewire/bebob/Makefile +++ b/sound/firewire/bebob/Makefile @@ -1,4 +1,4 @@ snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_control.o \ - bebob_midi.o bebob_pcm.o \ + bebob_midi.o bebob_pcm.o bebob_hwdep.o \ bebob.o obj-m += snd-bebob.o diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c index 2fdd14b..219eac7 100644 --- a/sound/firewire/bebob/bebob.c +++ b/sound/firewire/bebob/bebob.c @@ -171,12 +171,17 @@ snd_bebob_probe(struct fw_unit *unit, bebob->card_index = -1; mutex_init(&bebob->mutex); spin_lock_init(&bebob->lock); + init_waitqueue_head(&bebob->hwdep_wait);
/* name device with communication */ err = name_device(bebob, entry->vendor_id); if (err < 0) goto error;
+ err = snd_bebob_create_hwdep_device(bebob); + if (err < 0) + goto error; + err = snd_bebob_create_pcm_devices(bebob); if (err < 0) goto error; diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h index 04842b2..3950b02 100644 --- a/sound/firewire/bebob/bebob.h +++ b/sound/firewire/bebob/bebob.h @@ -34,6 +34,8 @@ #include <sound/rawmidi.h> #include <sound/pcm.h> #include <sound/pcm_params.h> +#include <sound/firewire.h> +#include <sound/hwdep.h>
#include "../packets-buffer.h" #include "../iso-resources.h" @@ -79,6 +81,11 @@ struct snd_bebob { rx_stream_formations[SND_BEBOB_STRM_FMT_ENTRIES];
struct snd_ctl_elem_id *ctl_id_freq; + + /* for uapi */ + int dev_lock_count; + bool dev_lock_changed; + wait_queue_head_t hwdep_wait; };
static inline int @@ -152,6 +159,10 @@ int snd_bebob_stream_stop_duplex(struct snd_bebob *bebob); void snd_bebob_stream_update_duplex(struct snd_bebob *bebob); void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob);
+void snd_bebob_stream_lock_changed(struct snd_bebob *bebob); +int snd_bebob_stream_lock_try(struct snd_bebob *bebob); +void snd_bebob_stream_lock_release(struct snd_bebob *bebob); + void snd_bebob_proc_init(struct snd_bebob *bebob);
int snd_bebob_create_control_devices(struct snd_bebob *bebob); @@ -160,6 +171,8 @@ int snd_bebob_create_midi_devices(struct snd_bebob *bebob);
int snd_bebob_create_pcm_devices(struct snd_bebob *bebob);
+int snd_bebob_create_hwdep_device(struct snd_bebob *bebob); + #define SND_BEBOB_DEV_ENTRY(vendor, model) \ { \ .match_flags = IEEE1394_MATCH_VENDOR_ID | \ diff --git a/sound/firewire/bebob/bebob_hwdep.c b/sound/firewire/bebob/bebob_hwdep.c new file mode 100644 index 0000000..be423b7 --- /dev/null +++ b/sound/firewire/bebob/bebob_hwdep.c @@ -0,0 +1,207 @@ +/* + * fireworks_hwdep.c - a part of driver for Fireworks based devices + * + * Copyright (c) 2013 Takashi Sakamoto + * + * + * This driver is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2. + * + * This driver is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this driver; if not, see http://www.gnu.org/licenses/. + */ + +/* + * This codes give three functionality. + * + * 1.get firewire node reference + * 2.lock/unlock stream + * dice driver implements the same functionality. + */ + +#include "bebob.h" + +static long +hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, + loff_t *offset) +{ + struct snd_bebob *bebob = hwdep->private_data; + DEFINE_WAIT(wait); + union snd_firewire_event event; + + spin_lock_irq(&bebob->lock); + + while (!bebob->dev_lock_changed) { + prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE); + spin_unlock_irq(&bebob->lock); + schedule(); + finish_wait(&bebob->hwdep_wait, &wait); + if (signal_pending(current)) + return -ERESTARTSYS; + spin_lock_irq(&bebob->lock); + } + + memset(&event, 0, sizeof(event)); + if (bebob->dev_lock_changed) { + event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; + event.lock_status.status = (bebob->dev_lock_count > 0); + bebob->dev_lock_changed = false; + + count = min(count, (long)sizeof(event.lock_status)); + } + + spin_unlock_irq(&bebob->lock); + + if (copy_to_user(buf, &event, count)) + return -EFAULT; + + return count; +} + +static unsigned int +hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait) +{ + struct snd_bebob *bebob = hwdep->private_data; + unsigned int events; + + poll_wait(file, &bebob->hwdep_wait, wait); + + spin_lock_irq(&bebob->lock); + if (bebob->dev_lock_changed) + events = POLLIN | POLLRDNORM; + else + events = 0; + spin_unlock_irq(&bebob->lock); + + return events; +} + +static int +hwdep_get_info(struct snd_bebob *bebob, void __user *arg) +{ + struct fw_device *dev = fw_parent_device(bebob->unit); + struct snd_firewire_get_info info; + + memset(&info, 0, sizeof(info)); + info.type = SNDRV_FIREWIRE_TYPE_BEBOB; + info.card = dev->card->index; + *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); + *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); + strlcpy(info.device_name, dev_name(&dev->device), + sizeof(info.device_name)); + + if (copy_to_user(arg, &info, sizeof(info))) + return -EFAULT; + + return 0; +} + +static int +hwdep_lock(struct snd_bebob *bebob) +{ + int err; + + spin_lock_irq(&bebob->lock); + + if (bebob->dev_lock_count == 0) { + bebob->dev_lock_count = -1; + err = 0; + } else + err = -EBUSY; + + spin_unlock_irq(&bebob->lock); + + return err; +} + +static int +hwdep_unlock(struct snd_bebob *bebob) +{ + int err; + + spin_lock_irq(&bebob->lock); + + if (bebob->dev_lock_count == -1) { + bebob->dev_lock_count = 0; + err = 0; + } else + err = -EBADFD; + + spin_unlock_irq(&bebob->lock); + + return err; +} + +static int +hwdep_release(struct snd_hwdep *hwdep, struct file *file) +{ + struct snd_bebob *bebob = hwdep->private_data; + + spin_lock_irq(&bebob->lock); + if (bebob->dev_lock_count == -1) + bebob->dev_lock_count = 0; + spin_unlock_irq(&bebob->lock); + + return 0; +} + +static int +hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct snd_bebob *bebob = hwdep->private_data; + + switch (cmd) { + case SNDRV_FIREWIRE_IOCTL_GET_INFO: + return hwdep_get_info(bebob, (void __user *)arg); + case SNDRV_FIREWIRE_IOCTL_LOCK: + return hwdep_lock(bebob); + case SNDRV_FIREWIRE_IOCTL_UNLOCK: + return hwdep_unlock(bebob); + default: + return -ENOIOCTLCMD; + } +} + +#ifdef CONFIG_COMPAT +static int +hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return hwdep_ioctl(hwdep, file, cmd, + (unsigned long)compat_ptr(arg)); +} +#else +#define hwdep_compat_ioctl NULL +#endif + +static const struct snd_hwdep_ops hwdep_ops = { + .read = hwdep_read, + .release = hwdep_release, + .poll = hwdep_poll, + .ioctl = hwdep_ioctl, + .ioctl_compat = hwdep_compat_ioctl, +}; + +int snd_bebob_create_hwdep_device(struct snd_bebob *bebob) +{ + struct snd_hwdep *hwdep; + int err; + + err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep); + if (err < 0) + goto end; + strcpy(hwdep->name, "BeBoB"); + hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB; + hwdep->ops = hwdep_ops; + hwdep->private_data = bebob; + hwdep->exclusive = true; +end: + return err; +} + diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c index 56c7115..a5a4028 100644 --- a/sound/firewire/bebob/bebob_midi.c +++ b/sound/firewire/bebob/bebob_midi.c @@ -26,6 +26,10 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream) struct snd_bebob *bebob = substream->rmidi->private_data; int err;
+ err = snd_bebob_stream_lock_try(bebob); + if (err < 0) + goto end; + err = snd_bebob_stream_start_duplex(bebob, &bebob->tx_stream, 0); if (err < 0) goto end; @@ -40,6 +44,10 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream) struct snd_bebob *bebob = substream->rmidi->private_data; int err;
+ err = snd_bebob_stream_lock_try(bebob); + if (err < 0) + goto end; + err = snd_bebob_stream_start_duplex(bebob, &bebob->rx_stream, 0); if (err < 0) goto end; @@ -55,6 +63,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
amdtp_stream_midi_remove(&bebob->tx_stream, substream); snd_bebob_stream_stop_duplex(bebob); + snd_bebob_stream_lock_release(bebob);
return 0; } @@ -65,6 +74,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
amdtp_stream_midi_remove(&bebob->rx_stream, substream); snd_bebob_stream_stop_duplex(bebob); + snd_bebob_stream_lock_release(bebob);
return 0; } diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c index 04913b2..c7cca80 100644 --- a/sound/firewire/bebob/bebob_pcm.c +++ b/sound/firewire/bebob/bebob_pcm.c @@ -239,29 +239,37 @@ pcm_open(struct snd_pcm_substream *substream) unsigned int sampling_rate; int err;
- err = pcm_init_hw_params(bebob, substream); + err = snd_bebob_stream_lock_try(bebob); if (err < 0) goto end;
+ err = pcm_init_hw_params(bebob, substream); + if (err < 0) + goto err_locked; + if (amdtp_stream_pcm_running(&bebob->tx_stream) || amdtp_stream_pcm_running(&bebob->rx_stream)) { err = snd_bebob_stream_get_rate(bebob, &sampling_rate); if (err < 0) - goto end; + goto err_locked;
substream->runtime->hw.rate_min = sampling_rate; substream->runtime->hw.rate_max = sampling_rate; }
snd_pcm_set_sync(substream); - end: return err; +err_locked: + snd_bebob_stream_lock_release(bebob); + return err; }
static int pcm_close(struct snd_pcm_substream *substream) { + struct snd_bebob *bebob = substream->private_data; + snd_bebob_stream_lock_release(bebob); return 0; }
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c index 773dffb..f2527bf 100644 --- a/sound/firewire/bebob/bebob_stream.c +++ b/sound/firewire/bebob/bebob_stream.c @@ -666,3 +666,42 @@ int snd_bebob_stream_discover(struct snd_bebob *bebob) end: return err; } + +void snd_bebob_stream_lock_changed(struct snd_bebob *bebob) +{ + bebob->dev_lock_changed = true; + wake_up(&bebob->hwdep_wait); +} + +int snd_bebob_stream_lock_try(struct snd_bebob *bebob) +{ + int err; + + spin_lock_irq(&bebob->lock); + + /* user land lock this */ + if (bebob->dev_lock_count < 0) { + err = -EBUSY; + goto end; + } + + /* this is the first time */ + if (bebob->dev_lock_count++ == 0) + snd_bebob_stream_lock_changed(bebob); + err = 0; +end: + spin_unlock_irq(&bebob->lock); + return err; +} + +void snd_bebob_stream_lock_release(struct snd_bebob *bebob) +{ + spin_lock_irq(&bebob->lock); + + if (WARN_ON(bebob->dev_lock_count <= 0)) + goto end; + if (--bebob->dev_lock_count == 0) + snd_bebob_stream_lock_changed(bebob); +end: + spin_unlock_irq(&bebob->lock); +}