This interface is designed for mixer/control application. To use hwdep interface, the application can get information about firewire node, can lock/unlock kernel streaming and can get notification at starting/stopping kernel streaming.
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 | 197 ++++++++++++++++++++++++++++++++++++ sound/firewire/bebob/bebob_midi.c | 28 ++++- sound/firewire/bebob/bebob_pcm.c | 16 ++- sound/firewire/bebob/bebob_stream.c | 39 +++++++ 10 files changed, 296 insertions(+), 9 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 5dfbfdf..2249483 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -95,9 +95,10 @@ enum { SNDRV_HWDEP_IFACE_USB_STREAM, /* direct access to usb stream */ SNDRV_HWDEP_IFACE_FW_DICE, /* TC DICE FireWire device */ SNDRV_HWDEP_IFACE_FW_FIREWORKS, /* Echo Audio Fireworks based 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_FIREWORKS + 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 910ed34..77a594d 100644 --- a/include/uapi/sound/firewire.h +++ b/include/uapi/sound/firewire.h @@ -53,6 +53,7 @@ union snd_firewire_event {
#define SNDRV_FIREWIRE_TYPE_DICE 1 #define SNDRV_FIREWIRE_TYPE_FIREWORKS 2 +#define SNDRV_FIREWIRE_TYPE_BEBOB 3 /* Fireworks, AV/C, RME, MOTU, ... */
struct snd_firewire_get_info { diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig index 3da4b60..304f49e 100644 --- a/sound/firewire/Kconfig +++ b/sound/firewire/Kconfig @@ -81,6 +81,7 @@ config SND_BEBOB select SND_FIREWIRE_LIB select SND_RAWMIDI select SND_PCM + select SND_HWDEP help Say Y here to include support for FireWire devices based on BridgeCo DM1000/1500 with BeBoB firmware: diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile index 533718a..7808777 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_midi.o \ - bebob_pcm.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 f7c8a73..881bd1d 100644 --- a/sound/firewire/bebob/bebob.c +++ b/sound/firewire/bebob/bebob.c @@ -155,6 +155,7 @@ 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);
err = name_device(bebob, entry->vendor_id); if (err < 0) @@ -181,6 +182,10 @@ bebob_probe(struct fw_unit *unit, if (err < 0) goto error;
+ err = snd_bebob_create_hwdep_device(bebob); + if (err < 0) + goto error; + snd_card_set_dev(card, &unit->device); err = snd_card_register(card); if (err < 0) { diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h index c16230e..d06f3f3 100644 --- a/sound/firewire/bebob/bebob.h +++ b/sound/firewire/bebob/bebob.h @@ -24,6 +24,8 @@ #include <sound/rawmidi.h> #include <sound/pcm.h> #include <sound/pcm_params.h> +#include <sound/firewire.h> +#include <sound/hwdep.h>
#include "../lib.h" #include "../fcp.h" @@ -69,6 +71,11 @@ struct snd_bebob { rx_stream_formations[SND_BEBOB_STRM_FMT_ENTRIES];
int sync_input_plug; + + /* for uapi */ + int dev_lock_count; + bool dev_lock_changed; + wait_queue_head_t hwdep_wait; };
static inline int @@ -178,12 +185,18 @@ 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_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..54937c0 --- /dev/null +++ b/sound/firewire/bebob/bebob_hwdep.c @@ -0,0 +1,197 @@ +/* + * bebob_hwdep.c - a part of driver for BeBoB based devices + * + * Copyright (c) 2013 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +/* + * This codes give three functionality. + * + * 1.get firewire node infomation + * 2.get notification about starting/stopping stream + * 3.lock/unlock stream + */ + +#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_t(long, count, 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 36ef88b..446c5c9 100644 --- a/sound/firewire/bebob/bebob_midi.c +++ b/sound/firewire/bebob/bebob_midi.c @@ -11,19 +11,41 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream) { struct snd_bebob *bebob = substream->rmidi->private_data; - return snd_bebob_stream_start_duplex(bebob, &bebob->tx_stream, 0); + 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) + snd_bebob_stream_lock_release(bebob); +end: + return err; }
static int midi_playback_open(struct snd_rawmidi_substream *substream) { struct snd_bebob *bebob = substream->rmidi->private_data; - return snd_bebob_stream_start_duplex(bebob, &bebob->rx_stream, 0); + 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) + snd_bebob_stream_lock_release(bebob); +end: + return err; }
static int midi_close(struct snd_rawmidi_substream *substream) { struct snd_bebob *bebob = substream->rmidi->private_data; - return snd_bebob_stream_stop_duplex(bebob); + snd_bebob_stream_stop_duplex(bebob); + snd_bebob_stream_lock_release(bebob); + return 0; }
static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c index f6a2b5b..525c4ac 100644 --- a/sound/firewire/bebob/bebob_pcm.c +++ b/sound/firewire/bebob/bebob_pcm.c @@ -239,13 +239,17 @@ pcm_open(struct snd_pcm_substream *substream) bool internal; 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; + err = snd_bebob_stream_check_internal_clock(bebob, &internal); if (err < 0) - goto end; + goto err_locked;
/* * When source of clock is internal or any PCM stream are running, @@ -256,21 +260,25 @@ pcm_open(struct snd_pcm_substream *substream) 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 7c604d8..533d49a 100644 --- a/sound/firewire/bebob/bebob_stream.c +++ b/sound/firewire/bebob/bebob_stream.c @@ -771,3 +771,42 @@ 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); +}