ALSA: dice: implement hwdep device
Implement the hwdep locking and notification mechanisms. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch
parent
4ed31f20bb
commit
0c29c9180f
@ -5,6 +5,7 @@
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include <linux/compat.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/firewire.h>
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@ -13,8 +14,11 @@
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#include <linux/mod_devicetable.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <sound/control.h>
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#include <sound/core.h>
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#include <sound/firewire.h>
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#include <sound/hwdep.h>
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#include <sound/initval.h>
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#include <sound/pcm.h>
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@ -233,13 +237,18 @@
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struct dice {
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struct snd_card *card;
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struct fw_unit *unit;
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spinlock_t lock;
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struct mutex mutex;
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unsigned int global_offset;
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unsigned int rx_offset;
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struct fw_address_handler notification_handler;
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int owner_generation;
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int dev_lock_count; /* > 0 driver, < 0 userspace */
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bool dev_lock_changed;
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bool global_enabled;
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bool stream_running;
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wait_queue_head_t hwdep_wait;
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u32 notification_bits;
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struct snd_pcm_substream *pcm;
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struct fw_iso_resources resources;
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struct amdtp_out_stream stream;
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@ -259,6 +268,47 @@ static const unsigned int dice_rates[] = {
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[6] = 192000,
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};
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static void dice_lock_changed(struct dice *dice)
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{
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dice->dev_lock_changed = true;
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wake_up(&dice->hwdep_wait);
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}
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static int dice_try_lock(struct dice *dice)
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{
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int err;
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spin_lock_irq(&dice->lock);
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if (dice->dev_lock_count < 0) {
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err = -EBUSY;
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goto out;
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}
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if (dice->dev_lock_count++ == 0)
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dice_lock_changed(dice);
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err = 0;
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out:
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spin_unlock_irq(&dice->lock);
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return err;
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}
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static void dice_unlock(struct dice *dice)
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{
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spin_lock_irq(&dice->lock);
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if (WARN_ON(dice->dev_lock_count <= 0))
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goto out;
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if (--dice->dev_lock_count == 0)
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dice_lock_changed(dice);
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out:
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spin_unlock_irq(&dice->lock);
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}
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static inline u64 global_address(struct dice *dice, unsigned int offset)
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{
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return DICE_PRIVATE_SPACE + dice->global_offset + offset;
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@ -496,6 +546,7 @@ static void dice_notification(struct fw_card *card, struct fw_request *request,
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void *data, size_t length, void *callback_data)
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{
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struct dice *dice = callback_data;
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unsigned long flags;
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if (tcode != TCODE_WRITE_QUADLET_REQUEST) {
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fw_send_response(card, request, RCODE_TYPE_ERROR);
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@ -505,9 +556,11 @@ static void dice_notification(struct fw_card *card, struct fw_request *request,
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fw_send_response(card, request, RCODE_ADDRESS_ERROR);
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return;
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}
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dev_dbg(&dice->unit->device,
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"notification: %08x\n", be32_to_cpup(data));
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spin_lock_irqsave(&dice->lock, flags);
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dice->notification_bits |= be32_to_cpup(data);
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spin_unlock_irqrestore(&dice->lock, flags);
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fw_send_response(card, request, RCODE_COMPLETE);
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wake_up(&dice->hwdep_wait);
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}
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static int dice_open(struct snd_pcm_substream *substream)
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@ -531,26 +584,32 @@ static int dice_open(struct snd_pcm_substream *substream)
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unsigned int rate;
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int err;
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err = dice_try_lock(dice);
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if (err < 0)
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goto error;
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err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
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global_address(dice, GLOBAL_CLOCK_SELECT),
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&clock_sel, 4);
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if (err < 0)
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return err;
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goto err_lock;
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rate = (be32_to_cpu(clock_sel) & CLOCK_RATE_MASK) >> CLOCK_RATE_SHIFT;
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if (rate >= ARRAY_SIZE(dice_rates))
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return -ENXIO;
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if (rate >= ARRAY_SIZE(dice_rates)) {
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err = -ENXIO;
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goto err_lock;
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}
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rate = dice_rates[rate];
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err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
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rx_address(dice, RX_NUMBER_AUDIO),
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&number_audio, 4);
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if (err < 0)
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return err;
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goto err_lock;
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err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
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rx_address(dice, RX_NUMBER_MIDI),
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&number_midi, 4);
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if (err < 0)
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return err;
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goto err_lock;
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runtime->hw = hardware;
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@ -568,17 +627,26 @@ static int dice_open(struct snd_pcm_substream *substream)
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SNDRV_PCM_HW_PARAM_PERIOD_TIME,
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5000, 8192000);
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if (err < 0)
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return err;
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goto err_lock;
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err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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if (err < 0)
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return err;
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goto err_lock;
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return 0;
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err_lock:
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dice_unlock(dice);
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error:
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return err;
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}
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static int dice_close(struct snd_pcm_substream *substream)
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{
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struct dice *dice = substream->private_data;
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dice_unlock(dice);
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return 0;
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}
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@ -783,45 +851,156 @@ static int dice_create_pcm(struct dice *dice)
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return 0;
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}
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// TODO: implement these
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static long dice_hwdep_read(struct snd_hwdep *hwdep, char __user *buf,
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long count, loff_t *offset)
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{
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return -EIO;
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}
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struct dice *dice = hwdep->private_data;
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DEFINE_WAIT(wait);
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union snd_firewire_event event;
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static int dice_hwdep_open(struct snd_hwdep *hwdep, struct file *file)
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{
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return -EIO;
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}
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spin_lock_irq(&dice->lock);
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static int dice_hwdep_release(struct snd_hwdep *hwdep, struct file *file)
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{
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return 0;
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while (!dice->dev_lock_changed && dice->notification_bits == 0) {
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prepare_to_wait(&dice->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
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spin_unlock_irq(&dice->lock);
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schedule();
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finish_wait(&dice->hwdep_wait, &wait);
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if (signal_pending(current))
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return -ERESTARTSYS;
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spin_lock_irq(&dice->lock);
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}
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memset(&event, 0, sizeof(event));
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if (dice->dev_lock_changed) {
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event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
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event.lock_status.status = dice->dev_lock_count > 0;
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dice->dev_lock_changed = false;
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count = min(count, (long)sizeof(event.lock_status));
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} else {
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event.dice_notification.type = SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION;
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event.dice_notification.notification = dice->notification_bits;
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dice->notification_bits = 0;
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count = min(count, (long)sizeof(event.dice_notification));
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}
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spin_unlock_irq(&dice->lock);
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if (copy_to_user(buf, &event, count))
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return -EFAULT;
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return count;
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}
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static unsigned int dice_hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
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poll_table *wait)
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{
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return POLLERR | POLLHUP;
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struct dice *dice = hwdep->private_data;
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unsigned int events;
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poll_wait(file, &dice->hwdep_wait, wait);
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spin_lock_irq(&dice->lock);
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if (dice->dev_lock_changed || dice->notification_bits != 0)
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events = POLLIN | POLLRDNORM;
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else
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events = 0;
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spin_unlock_irq(&dice->lock);
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return events;
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}
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static int dice_hwdep_get_info(struct dice *dice, void __user *arg)
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{
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struct fw_device *dev = fw_parent_device(dice->unit);
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struct snd_firewire_get_info info;
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memset(&info, 0, sizeof(info));
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info.type = SNDRV_FIREWIRE_TYPE_DICE;
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info.card = dev->card->index;
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*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
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*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
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strlcpy(info.device_name, dev_name(&dev->device),
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sizeof(info.device_name));
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if (copy_to_user(arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int dice_hwdep_lock(struct dice *dice)
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{
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int err;
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spin_lock_irq(&dice->lock);
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if (dice->dev_lock_count == 0) {
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dice->dev_lock_count = -1;
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err = 0;
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} else {
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err = -EBUSY;
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}
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spin_unlock_irq(&dice->lock);
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return err;
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}
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static int dice_hwdep_unlock(struct dice *dice)
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{
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int err;
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spin_lock_irq(&dice->lock);
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if (dice->dev_lock_count == -1) {
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dice->dev_lock_count = 0;
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err = 0;
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} else {
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err = -EBADFD;
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}
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spin_unlock_irq(&dice->lock);
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return err;
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}
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static int dice_hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return -EIO;
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struct dice *dice = hwdep->private_data;
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switch (cmd) {
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case SNDRV_FIREWIRE_IOCTL_GET_INFO:
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return dice_hwdep_get_info(dice, (void __user *)arg);
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case SNDRV_FIREWIRE_IOCTL_LOCK:
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return dice_hwdep_lock(dice);
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case SNDRV_FIREWIRE_IOCTL_UNLOCK:
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return dice_hwdep_unlock(dice);
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default:
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return -ENOIOCTLCMD;
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}
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}
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#ifdef CONFIG_COMPAT
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static int dice_hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return dice_hwdep_ioctl(hwdep, file, cmd,
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(unsigned long)compat_ptr(arg));
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}
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#else
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#define dice_hwdep_compat_ioctl NULL
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#endif
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static int dice_create_hwdep(struct dice *dice)
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{
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static const struct snd_hwdep_ops ops = {
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.read = dice_hwdep_read,
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.open = dice_hwdep_open,
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.release = dice_hwdep_release,
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.poll = dice_hwdep_poll,
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.ioctl = dice_hwdep_ioctl,
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.ioctl_compat = dice_hwdep_ioctl,
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.ioctl_compat = dice_hwdep_compat_ioctl,
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};
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struct snd_hwdep *hwdep;
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int err;
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@ -922,8 +1101,10 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
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dice = card->private_data;
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dice->card = card;
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spin_lock_init(&dice->lock);
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mutex_init(&dice->mutex);
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dice->unit = unit;
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init_waitqueue_head(&dice->hwdep_wait);
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err = dice_init_offsets(dice);
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if (err < 0)
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