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Diffstat (limited to 'sound/firewire/dice/dice.c')
-rw-r--r--sound/firewire/dice/dice.c227
1 files changed, 120 insertions, 107 deletions
diff --git a/sound/firewire/dice/dice.c b/sound/firewire/dice/dice.c
index 0cda05c72f50..b91b3739c810 100644
--- a/sound/firewire/dice/dice.c
+++ b/sound/firewire/dice/dice.c
@@ -18,27 +18,14 @@ MODULE_LICENSE("GPL v2");
#define WEISS_CATEGORY_ID 0x00
#define LOUD_CATEGORY_ID 0x10
-static int dice_interface_check(struct fw_unit *unit)
+#define PROBE_DELAY_MS (2 * MSEC_PER_SEC)
+
+static int check_dice_category(struct fw_unit *unit)
{
- static const int min_values[10] = {
- 10, 0x64 / 4,
- 10, 0x18 / 4,
- 10, 0x18 / 4,
- 0, 0,
- 0, 0,
- };
struct fw_device *device = fw_parent_device(unit);
struct fw_csr_iterator it;
- int key, val, vendor = -1, model = -1, err;
- unsigned int category, i;
- __be32 *pointers;
- u32 value;
- __be32 version;
-
- pointers = kmalloc_array(ARRAY_SIZE(min_values), sizeof(__be32),
- GFP_KERNEL);
- if (pointers == NULL)
- return -ENOMEM;
+ int key, val, vendor = -1, model = -1;
+ unsigned int category;
/*
* Check that GUID and unit directory are constructed according to DICE
@@ -64,51 +51,10 @@ static int dice_interface_check(struct fw_unit *unit)
else
category = DICE_CATEGORY_ID;
if (device->config_rom[3] != ((vendor << 8) | category) ||
- device->config_rom[4] >> 22 != model) {
- err = -ENODEV;
- goto end;
- }
-
- /*
- * Check that the sub address spaces exist and are located inside the
- * private address space. The minimum values are chosen so that all
- * minimally required registers are included.
- */
- err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,
- DICE_PRIVATE_SPACE, pointers,
- sizeof(__be32) * ARRAY_SIZE(min_values), 0);
- if (err < 0) {
- err = -ENODEV;
- goto end;
- }
- for (i = 0; i < ARRAY_SIZE(min_values); ++i) {
- value = be32_to_cpu(pointers[i]);
- if (value < min_values[i] || value >= 0x40000) {
- err = -ENODEV;
- goto end;
- }
- }
+ device->config_rom[4] >> 22 != model)
+ return -ENODEV;
- /*
- * Check that the implemented DICE driver specification major version
- * number matches.
- */
- err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
- DICE_PRIVATE_SPACE +
- be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
- &version, 4, 0);
- if (err < 0) {
- err = -ENODEV;
- goto end;
- }
- if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
- dev_err(&unit->device,
- "unknown DICE version: 0x%08x\n", be32_to_cpu(version));
- err = -ENODEV;
- goto end;
- }
-end:
- return err;
+ return 0;
}
static int highest_supported_mode_rate(struct snd_dice *dice,
@@ -231,6 +177,16 @@ static void dice_card_strings(struct snd_dice *dice)
strcpy(card->mixername, "DICE");
}
+static void dice_free(struct snd_dice *dice)
+{
+ snd_dice_stream_destroy_duplex(dice);
+ snd_dice_transaction_destroy(dice);
+ fw_unit_put(dice->unit);
+
+ mutex_destroy(&dice->mutex);
+ kfree(dice);
+}
+
/*
* This module releases the FireWire unit data after all ALSA character devices
* are released by applications. This is for releasing stream data or finishing
@@ -239,39 +195,21 @@ static void dice_card_strings(struct snd_dice *dice)
*/
static void dice_card_free(struct snd_card *card)
{
- struct snd_dice *dice = card->private_data;
-
- snd_dice_stream_destroy_duplex(dice);
- snd_dice_transaction_destroy(dice);
- fw_unit_put(dice->unit);
-
- mutex_destroy(&dice->mutex);
+ dice_free(card->private_data);
}
-static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
+static void do_registration(struct work_struct *work)
{
- struct snd_card *card;
- struct snd_dice *dice;
+ struct snd_dice *dice = container_of(work, struct snd_dice, dwork.work);
int err;
- err = dice_interface_check(unit);
- if (err < 0)
- goto end;
+ if (dice->registered)
+ return;
- err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
- sizeof(*dice), &card);
+ err = snd_card_new(&dice->unit->device, -1, NULL, THIS_MODULE, 0,
+ &dice->card);
if (err < 0)
- goto end;
-
- dice = card->private_data;
- dice->card = card;
- dice->unit = fw_unit_get(unit);
- card->private_free = dice_card_free;
-
- spin_lock_init(&dice->lock);
- mutex_init(&dice->mutex);
- init_completion(&dice->clock_accepted);
- init_waitqueue_head(&dice->hwdep_wait);
+ return;
err = snd_dice_transaction_init(dice);
if (err < 0)
@@ -283,56 +221,131 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
dice_card_strings(dice);
+ snd_dice_create_proc(dice);
+
err = snd_dice_create_pcm(dice);
if (err < 0)
goto error;
- err = snd_dice_create_hwdep(dice);
+ err = snd_dice_create_midi(dice);
if (err < 0)
goto error;
- snd_dice_create_proc(dice);
-
- err = snd_dice_create_midi(dice);
+ err = snd_dice_create_hwdep(dice);
if (err < 0)
goto error;
- err = snd_dice_stream_init_duplex(dice);
+ err = snd_card_register(dice->card);
if (err < 0)
goto error;
- err = snd_card_register(card);
+ /*
+ * After registered, dice instance can be released corresponding to
+ * releasing the sound card instance.
+ */
+ dice->card->private_free = dice_card_free;
+ dice->card->private_data = dice;
+ dice->registered = true;
+
+ return;
+error:
+ snd_dice_transaction_destroy(dice);
+ snd_card_free(dice->card);
+ dev_info(&dice->unit->device,
+ "Sound card registration failed: %d\n", err);
+}
+
+static void schedule_registration(struct snd_dice *dice)
+{
+ struct fw_card *fw_card = fw_parent_device(dice->unit)->card;
+ u64 now, delay;
+
+ now = get_jiffies_64();
+ delay = fw_card->reset_jiffies + msecs_to_jiffies(PROBE_DELAY_MS);
+
+ if (time_after64(delay, now))
+ delay -= now;
+ else
+ delay = 0;
+
+ mod_delayed_work(system_wq, &dice->dwork, delay);
+}
+
+static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
+{
+ struct snd_dice *dice;
+ int err;
+
+ err = check_dice_category(unit);
+ if (err < 0)
+ return -ENODEV;
+
+ /* Allocate this independent of sound card instance. */
+ dice = kzalloc(sizeof(struct snd_dice), GFP_KERNEL);
+ if (dice == NULL)
+ return -ENOMEM;
+
+ dice->unit = fw_unit_get(unit);
+ dev_set_drvdata(&unit->device, dice);
+
+ spin_lock_init(&dice->lock);
+ mutex_init(&dice->mutex);
+ init_completion(&dice->clock_accepted);
+ init_waitqueue_head(&dice->hwdep_wait);
+
+ err = snd_dice_stream_init_duplex(dice);
if (err < 0) {
- snd_dice_stream_destroy_duplex(dice);
- goto error;
+ dice_free(dice);
+ return err;
}
- dev_set_drvdata(&unit->device, dice);
-end:
- return err;
-error:
- snd_card_free(card);
- return err;
+ /* Allocate and register this sound card later. */
+ INIT_DEFERRABLE_WORK(&dice->dwork, do_registration);
+ schedule_registration(dice);
+
+ return 0;
}
static void dice_remove(struct fw_unit *unit)
{
struct snd_dice *dice = dev_get_drvdata(&unit->device);
- /* No need to wait for releasing card object in this context. */
- snd_card_free_when_closed(dice->card);
+ /*
+ * Confirm to stop the work for registration before the sound card is
+ * going to be released. The work is not scheduled again because bus
+ * reset handler is not called anymore.
+ */
+ cancel_delayed_work_sync(&dice->dwork);
+
+ if (dice->registered) {
+ /* No need to wait for releasing card object in this context. */
+ snd_card_free_when_closed(dice->card);
+ } else {
+ /* Don't forget this case. */
+ dice_free(dice);
+ }
}
static void dice_bus_reset(struct fw_unit *unit)
{
struct snd_dice *dice = dev_get_drvdata(&unit->device);
+ /* Postpone a workqueue for deferred registration. */
+ if (!dice->registered)
+ schedule_registration(dice);
+
/* The handler address register becomes initialized. */
snd_dice_transaction_reinit(dice);
- mutex_lock(&dice->mutex);
- snd_dice_stream_update_duplex(dice);
- mutex_unlock(&dice->mutex);
+ /*
+ * After registration, userspace can start packet streaming, then this
+ * code block works fine.
+ */
+ if (dice->registered) {
+ mutex_lock(&dice->mutex);
+ snd_dice_stream_update_duplex(dice);
+ mutex_unlock(&dice->mutex);
+ }
}
#define DICE_INTERFACE 0x000001