This commit adds hwdep interface so as the other drivers for audio and music units on IEEE 1394 have.
This interface is designed for mixer/control applications. By using this interface, an 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 | 2 +- sound/firewire/Kconfig | 1 + sound/firewire/fireface/Makefile | 2 +- sound/firewire/fireface/ff-hwdep.c | 191 ++++++++++++++++++++++++++++++++++++ sound/firewire/fireface/ff-pcm.c | 20 +++- sound/firewire/fireface/ff-stream.c | 39 ++++++++ sound/firewire/fireface/ff.c | 5 + sound/firewire/fireface/ff.h | 13 +++ 9 files changed, 270 insertions(+), 6 deletions(-) create mode 100644 sound/firewire/fireface/ff-hwdep.c
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index fd7b561..fd41697 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -108,9 +108,10 @@ enum { SNDRV_HWDEP_IFACE_FW_TASCAM, /* TASCAM FireWire series */ SNDRV_HWDEP_IFACE_LINE6, /* Line6 USB processors */ SNDRV_HWDEP_IFACE_FW_MOTU, /* MOTU FireWire series */ + SNDRV_HWDEP_IFACE_FW_FIREFACE, /* RME Fireface series */
/* Don't forget to change the following: */ - SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_MOTU + SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_FIREFACE };
struct snd_hwdep_info { diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h index 29afc5e..6229004 100644 --- a/include/uapi/sound/firewire.h +++ b/include/uapi/sound/firewire.h @@ -73,7 +73,7 @@ union snd_firewire_event { #define SNDRV_FIREWIRE_TYPE_DIGI00X 5 #define SNDRV_FIREWIRE_TYPE_TASCAM 6 #define SNDRV_FIREWIRE_TYPE_MOTU 7 -/* RME... */ +#define SNDRV_FIREWIRE_TYPE_FIREFACE 8
struct snd_firewire_get_info { unsigned int type; /* SNDRV_FIREWIRE_TYPE_xxx */ diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig index b75a822..70f02ee 100644 --- a/sound/firewire/Kconfig +++ b/sound/firewire/Kconfig @@ -155,6 +155,7 @@ config SND_FIREWIRE_MOTU config SND_FIREFACE tristate "RME Fireface series support" select SND_FIREWIRE_LIB + select SND_HWDEP help Say Y here to include support for RME fireface series.
diff --git a/sound/firewire/fireface/Makefile b/sound/firewire/fireface/Makefile index e626938..8d6c612 100644 --- a/sound/firewire/fireface/Makefile +++ b/sound/firewire/fireface/Makefile @@ -1,3 +1,3 @@ snd-fireface-objs := ff.o ff-transaction.o ff-midi.o ff-proc.o amdtp-ff.o \ - ff-stream.o ff-pcm.o + ff-stream.o ff-pcm.o ff-hwdep.o obj-$(CONFIG_SND_FIREFACE) += snd-fireface.o diff --git a/sound/firewire/fireface/ff-hwdep.c b/sound/firewire/fireface/ff-hwdep.c new file mode 100644 index 0000000..3ee04b0 --- /dev/null +++ b/sound/firewire/fireface/ff-hwdep.c @@ -0,0 +1,191 @@ +/* + * ff-hwdep.c - a part of driver for RME Fireface series + * + * Copyright (c) 2015-2017 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +/* + * This codes give three functionality. + * + * 1.get firewire node information + * 2.get notification about starting/stopping stream + * 3.lock/unlock stream + */ + +#include "ff.h" + +static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, + loff_t *offset) +{ + struct snd_ff *ff = hwdep->private_data; + DEFINE_WAIT(wait); + union snd_firewire_event event; + + spin_lock_irq(&ff->lock); + + while (!ff->dev_lock_changed) { + prepare_to_wait(&ff->hwdep_wait, &wait, TASK_INTERRUPTIBLE); + spin_unlock_irq(&ff->lock); + schedule(); + finish_wait(&ff->hwdep_wait, &wait); + if (signal_pending(current)) + return -ERESTARTSYS; + spin_lock_irq(&ff->lock); + } + + memset(&event, 0, sizeof(event)); + if (ff->dev_lock_changed) { + event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; + event.lock_status.status = (ff->dev_lock_count > 0); + ff->dev_lock_changed = false; + + count = min_t(long, count, sizeof(event.lock_status)); + } + + spin_unlock_irq(&ff->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_ff *ff = hwdep->private_data; + unsigned int events; + + poll_wait(file, &ff->hwdep_wait, wait); + + spin_lock_irq(&ff->lock); + if (ff->dev_lock_changed) + events = POLLIN | POLLRDNORM; + else + events = 0; + spin_unlock_irq(&ff->lock); + + return events; +} + +static int hwdep_get_info(struct snd_ff *ff, void __user *arg) +{ + struct fw_device *dev = fw_parent_device(ff->unit); + struct snd_firewire_get_info info; + + memset(&info, 0, sizeof(info)); + info.type = SNDRV_FIREWIRE_TYPE_FIREFACE; + 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_ff *ff) +{ + int err; + + spin_lock_irq(&ff->lock); + + if (ff->dev_lock_count == 0) { + ff->dev_lock_count = -1; + err = 0; + } else { + err = -EBUSY; + } + + spin_unlock_irq(&ff->lock); + + return err; +} + +static int hwdep_unlock(struct snd_ff *ff) +{ + int err; + + spin_lock_irq(&ff->lock); + + if (ff->dev_lock_count == -1) { + ff->dev_lock_count = 0; + err = 0; + } else { + err = -EBADFD; + } + + spin_unlock_irq(&ff->lock); + + return err; +} + +static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) +{ + struct snd_ff *ff = hwdep->private_data; + + spin_lock_irq(&ff->lock); + if (ff->dev_lock_count == -1) + ff->dev_lock_count = 0; + spin_unlock_irq(&ff->lock); + + return 0; +} + +static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct snd_ff *ff = hwdep->private_data; + + switch (cmd) { + case SNDRV_FIREWIRE_IOCTL_GET_INFO: + return hwdep_get_info(ff, (void __user *)arg); + case SNDRV_FIREWIRE_IOCTL_LOCK: + return hwdep_lock(ff); + case SNDRV_FIREWIRE_IOCTL_UNLOCK: + return hwdep_unlock(ff); + 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 + +int snd_ff_create_hwdep_devices(struct snd_ff *ff) +{ + 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, + }; + struct snd_hwdep *hwdep; + int err; + + err = snd_hwdep_new(ff->card, ff->card->driver, 0, &hwdep); + if (err < 0) + return err; + + strcpy(hwdep->name, ff->card->driver); + hwdep->iface = SNDRV_HWDEP_IFACE_FW_FIREFACE; + hwdep->ops = hwdep_ops; + hwdep->private_data = ff; + hwdep->exclusive = true; + + return 0; +} diff --git a/sound/firewire/fireface/ff-pcm.c b/sound/firewire/fireface/ff-pcm.c index d282467..93cee19 100644 --- a/sound/firewire/fireface/ff-pcm.c +++ b/sound/firewire/fireface/ff-pcm.c @@ -154,13 +154,21 @@ static int pcm_open(struct snd_pcm_substream *substream) enum snd_ff_clock_src src; int i, err;
- err = pcm_init_hw_params(ff, substream); + err = snd_ff_stream_lock_try(ff); if (err < 0) return err;
+ err = pcm_init_hw_params(ff, substream); + if (err < 0) { + snd_ff_stream_lock_release(ff); + return err; + } + err = ff->spec->protocol->get_clock(ff, &rate, &src); - if (err < 0) + if (err < 0) { + snd_ff_stream_lock_release(ff); return err; + }
if (src != SND_FF_CLOCK_SRC_INTERNAL) { for (i = 0; i < CIP_SFC_COUNT; ++i) { @@ -171,8 +179,10 @@ static int pcm_open(struct snd_pcm_substream *substream) * The unit is configured at sampling frequency which packet * streaming engine can't support. */ - if (i >= CIP_SFC_COUNT) + if (i >= CIP_SFC_COUNT) { + snd_ff_stream_lock_release(ff); return -EIO; + }
substream->runtime->hw.rate_min = rate; substream->runtime->hw.rate_max = rate; @@ -192,6 +202,10 @@ static int pcm_open(struct snd_pcm_substream *substream)
static int pcm_close(struct snd_pcm_substream *substream) { + struct snd_ff *ff = substream->private_data; + + snd_ff_stream_lock_release(ff); + return 0; }
diff --git a/sound/firewire/fireface/ff-stream.c b/sound/firewire/fireface/ff-stream.c index 0ef6177..7888092 100644 --- a/sound/firewire/fireface/ff-stream.c +++ b/sound/firewire/fireface/ff-stream.c @@ -241,3 +241,42 @@ void snd_ff_stream_update_duplex(struct snd_ff *ff) fw_iso_resources_update(&ff->tx_resources); fw_iso_resources_update(&ff->rx_resources); } + +void snd_ff_stream_lock_changed(struct snd_ff *ff) +{ + ff->dev_lock_changed = true; + wake_up(&ff->hwdep_wait); +} + +int snd_ff_stream_lock_try(struct snd_ff *ff) +{ + int err; + + spin_lock_irq(&ff->lock); + + /* user land lock this */ + if (ff->dev_lock_count < 0) { + err = -EBUSY; + goto end; + } + + /* this is the first time */ + if (ff->dev_lock_count++ == 0) + snd_ff_stream_lock_changed(ff); + err = 0; +end: + spin_unlock_irq(&ff->lock); + return err; +} + +void snd_ff_stream_lock_release(struct snd_ff *ff) +{ + spin_lock_irq(&ff->lock); + + if (WARN_ON(ff->dev_lock_count <= 0)) + goto end; + if (--ff->dev_lock_count == 0) + snd_ff_stream_lock_changed(ff); +end: + spin_unlock_irq(&ff->lock); +} diff --git a/sound/firewire/fireface/ff.c b/sound/firewire/fireface/ff.c index ff62d16..f57b434 100644 --- a/sound/firewire/fireface/ff.c +++ b/sound/firewire/fireface/ff.c @@ -76,6 +76,10 @@ static void do_registration(struct work_struct *work) if (err < 0) goto error;
+ err = snd_ff_create_hwdep_devices(ff); + if (err < 0) + goto error; + err = snd_card_register(ff->card); if (err < 0) goto error; @@ -108,6 +112,7 @@ static int snd_ff_probe(struct fw_unit *unit,
mutex_init(&ff->mutex); spin_lock_init(&ff->lock); + init_waitqueue_head(&ff->hwdep_wait);
ff->spec = (const struct snd_ff_spec *)entry->driver_data;
diff --git a/sound/firewire/fireface/ff.h b/sound/firewire/fireface/ff.h index 0d5228c..a143b5a 100644 --- a/sound/firewire/fireface/ff.h +++ b/sound/firewire/fireface/ff.h @@ -17,12 +17,15 @@ #include <linux/mutex.h> #include <linux/slab.h> #include <linux/compat.h> +#include <linux/sched/signal.h>
#include <sound/core.h> #include <sound/info.h> #include <sound/rawmidi.h> #include <sound/pcm.h> #include <sound/pcm_params.h> +#include <sound/hwdep.h> +#include <sound/firewire.h>
#include "../lib.h" #include "../amdtp-stream.h" @@ -77,6 +80,10 @@ struct snd_ff { struct amdtp_stream rx_stream; struct fw_iso_resources tx_resources; struct fw_iso_resources rx_resources; + + int dev_lock_count; + bool dev_lock_changed; + wait_queue_head_t hwdep_wait; };
enum snd_ff_clock_src { @@ -122,10 +129,16 @@ int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate); void snd_ff_stream_stop_duplex(struct snd_ff *ff); void snd_ff_stream_update_duplex(struct snd_ff *ff);
+void snd_ff_stream_lock_changed(struct snd_ff *ff); +int snd_ff_stream_lock_try(struct snd_ff *ff); +void snd_ff_stream_lock_release(struct snd_ff *ff); + void snd_ff_proc_init(struct snd_ff *ff);
int snd_ff_create_midi_devices(struct snd_ff *ff);
int snd_ff_create_pcm_devices(struct snd_ff *ff);
+int snd_ff_create_hwdep_devices(struct snd_ff *ff); + #endif