1 files changed, 325 insertions, 0 deletions
diff --git a/sound/firewire/fireworks/fireworks_transaction.c b/sound/firewire/fireworks/fireworks_transaction.c
new file mode 100644
index 000000000..58674a711
--- /dev/null
+++ b/sound/firewire/fireworks/fireworks_transaction.c
@@ -0,0 +1,325 @@
+/*
+ * fireworks_transaction.c - a part of driver for Fireworks based devices
+ *
+ * Copyright (c) 2013-2014 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+/*
+ * Fireworks have its own transaction. The transaction can be delivered by AV/C
+ * Vendor Specific command frame or usual asynchronous transaction. At least,
+ * Windows driver and firmware version 5.5 or later don't use AV/C command.
+ *
+ * Transaction substance:
+ *  At first, 6 data exist. Following to the data, parameters for each command
+ *  exist. All of the parameters are 32 bit aligned to big endian.
+ *   data[0]:	Length of transaction substance
+ *   data[1]:	Transaction version
+ *   data[2]:	Sequence number. This is incremented by the device
+ *   data[3]:	Transaction category
+ *   data[4]:	Transaction command
+ *   data[5]:	Return value in response.
+ *   data[6-]:	Parameters
+ *
+ * Transaction address:
+ *  command:	0xecc000000000
+ *  response:	0xecc080000000 (default)
+ *
+ * I note that the address for response can be changed by command. But this
+ * module uses the default address.
+ */
+#include "./fireworks.h"
+
+#define MEMORY_SPACE_EFW_COMMAND	0xecc000000000ULL
+#define MEMORY_SPACE_EFW_RESPONSE	0xecc080000000ULL
+
+#define ERROR_RETRIES 3
+#define ERROR_DELAY_MS 5
+#define EFC_TIMEOUT_MS 125
+
+static DEFINE_SPINLOCK(instances_lock);
+static struct snd_efw *instances[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
+
+static DEFINE_SPINLOCK(transaction_queues_lock);
+static LIST_HEAD(transaction_queues);
+
+enum transaction_queue_state {
+	STATE_PENDING,
+	STATE_BUS_RESET,
+	STATE_COMPLETE
+};
+
+struct transaction_queue {
+	struct list_head list;
+	struct fw_unit *unit;
+	void *buf;
+	unsigned int size;
+	u32 seqnum;
+	enum transaction_queue_state state;
+	wait_queue_head_t wait;
+};
+
+int snd_efw_transaction_cmd(struct fw_unit *unit,
+			    const void *cmd, unsigned int size)
+{
+	return snd_fw_transaction(unit, TCODE_WRITE_BLOCK_REQUEST,
+				  MEMORY_SPACE_EFW_COMMAND,
+				  (void *)cmd, size, 0);
+}
+
+int snd_efw_transaction_run(struct fw_unit *unit,
+			    const void *cmd, unsigned int cmd_size,
+			    void *resp, unsigned int resp_size)
+{
+	struct transaction_queue t;
+	unsigned int tries;
+	int ret;
+
+	t.unit = unit;
+	t.buf = resp;
+	t.size = resp_size;
+	t.seqnum = be32_to_cpu(((struct snd_efw_transaction *)cmd)->seqnum) + 1;
+	t.state = STATE_PENDING;
+	init_waitqueue_head(&t.wait);
+
+	spin_lock_irq(&transaction_queues_lock);
+	list_add_tail(&t.list, &transaction_queues);
+	spin_unlock_irq(&transaction_queues_lock);
+
+	tries = 0;
+	do {
+		ret = snd_efw_transaction_cmd(t.unit, (void *)cmd, cmd_size);
+		if (ret < 0)
+			break;
+
+		wait_event_timeout(t.wait, t.state != STATE_PENDING,
+				   msecs_to_jiffies(EFC_TIMEOUT_MS));
+
+		if (t.state == STATE_COMPLETE) {
+			ret = t.size;
+			break;
+		} else if (t.state == STATE_BUS_RESET) {
+			msleep(ERROR_DELAY_MS);
+		} else if (++tries >= ERROR_RETRIES) {
+			dev_err(&t.unit->device, "EFW transaction timed out\n");
+			ret = -EIO;
+			break;
+		}
+	} while (1);
+
+	spin_lock_irq(&transaction_queues_lock);
+	list_del(&t.list);
+	spin_unlock_irq(&transaction_queues_lock);
+
+	return ret;
+}
+
+static void
+copy_resp_to_buf(struct snd_efw *efw, void *data, size_t length, int *rcode)
+{
+	size_t capacity, till_end;
+	struct snd_efw_transaction *t;
+
+	t = (struct snd_efw_transaction *)data;
+	length = min_t(size_t, be32_to_cpu(t->length) * sizeof(u32), length);
+
+	spin_lock(&efw->lock);
+
+	if (efw->push_ptr < efw->pull_ptr)
+		capacity = (unsigned int)(efw->pull_ptr - efw->push_ptr);
+	else
+		capacity = snd_efw_resp_buf_size -
+			   (unsigned int)(efw->push_ptr - efw->pull_ptr);
+
+	/* confirm enough space for this response */
+	if (capacity < length) {
+		*rcode = RCODE_CONFLICT_ERROR;
+		goto end;
+	}
+
+	/* copy to ring buffer */
+	while (length > 0) {
+		till_end = snd_efw_resp_buf_size -
+			   (unsigned int)(efw->push_ptr - efw->resp_buf);
+		till_end = min_t(unsigned int, length, till_end);
+
+		memcpy(efw->push_ptr, data, till_end);
+
+		efw->push_ptr += till_end;
+		if (efw->push_ptr >= efw->resp_buf + snd_efw_resp_buf_size)
+			efw->push_ptr -= snd_efw_resp_buf_size;
+
+		length -= till_end;
+		data += till_end;
+	}
+
+	/* for hwdep */
+	wake_up(&efw->hwdep_wait);
+
+	*rcode = RCODE_COMPLETE;
+end:
+	spin_unlock_irq(&efw->lock);
+}
+
+static void
+handle_resp_for_user(struct fw_card *card, int generation, int source,
+		     void *data, size_t length, int *rcode)
+{
+	struct fw_device *device;
+	struct snd_efw *efw;
+	unsigned int i;
+
+	spin_lock_irq(&instances_lock);
+
+	for (i = 0; i < SNDRV_CARDS; i++) {
+		efw = instances[i];
+		if (efw == NULL)
+			continue;
+		device = fw_parent_device(efw->unit);
+		if ((device->card != card) ||
+		    (device->generation != generation))
+			continue;
+		smp_rmb();	/* node id vs. generation */
+		if (device->node_id != source)
+			continue;
+
+		break;
+	}
+	if (i == SNDRV_CARDS)
+		goto end;
+
+	copy_resp_to_buf(efw, data, length, rcode);
+end:
+	spin_unlock(&instances_lock);
+}
+
+static void
+handle_resp_for_kernel(struct fw_card *card, int generation, int source,
+		       void *data, size_t length, int *rcode, u32 seqnum)
+{
+	struct fw_device *device;
+	struct transaction_queue *t;
+	unsigned long flags;
+
+	spin_lock_irqsave(&transaction_queues_lock, flags);
+	list_for_each_entry(t, &transaction_queues, list) {
+		device = fw_parent_device(t->unit);
+		if ((device->card != card) ||
+		    (device->generation != generation))
+			continue;
+		smp_rmb();	/* node_id vs. generation */
+		if (device->node_id != source)
+			continue;
+
+		if ((t->state == STATE_PENDING) && (t->seqnum == seqnum)) {
+			t->state = STATE_COMPLETE;
+			t->size = min_t(unsigned int, length, t->size);
+			memcpy(t->buf, data, t->size);
+			wake_up(&t->wait);
+			*rcode = RCODE_COMPLETE;
+		}
+	}
+	spin_unlock_irqrestore(&transaction_queues_lock, flags);
+}
+
+static void
+efw_response(struct fw_card *card, struct fw_request *request,
+	     int tcode, int destination, int source,
+	     int generation, unsigned long long offset,
+	     void *data, size_t length, void *callback_data)
+{
+	int rcode, dummy;
+	u32 seqnum;
+
+	rcode = RCODE_TYPE_ERROR;
+	if (length < sizeof(struct snd_efw_transaction)) {
+		rcode = RCODE_DATA_ERROR;
+		goto end;
+	} else if (offset != MEMORY_SPACE_EFW_RESPONSE) {
+		rcode = RCODE_ADDRESS_ERROR;
+		goto end;
+	}
+
+	seqnum = be32_to_cpu(((struct snd_efw_transaction *)data)->seqnum);
+	if (seqnum > SND_EFW_TRANSACTION_USER_SEQNUM_MAX + 1) {
+		handle_resp_for_kernel(card, generation, source,
+				       data, length, &rcode, seqnum);
+		if (snd_efw_resp_buf_debug)
+			handle_resp_for_user(card, generation, source,
+					     data, length, &dummy);
+	} else {
+		handle_resp_for_user(card, generation, source,
+				     data, length, &rcode);
+	}
+end:
+	fw_send_response(card, request, rcode);
+}
+
+void snd_efw_transaction_add_instance(struct snd_efw *efw)
+{
+	unsigned int i;
+
+	spin_lock_irq(&instances_lock);
+
+	for (i = 0; i < SNDRV_CARDS; i++) {
+		if (instances[i] != NULL)
+			continue;
+		instances[i] = efw;
+		break;
+	}
+
+	spin_unlock_irq(&instances_lock);
+}
+
+void snd_efw_transaction_remove_instance(struct snd_efw *efw)
+{
+	unsigned int i;
+
+	spin_lock_irq(&instances_lock);
+
+	for (i = 0; i < SNDRV_CARDS; i++) {
+		if (instances[i] != efw)
+			continue;
+		instances[i] = NULL;
+	}
+
+	spin_unlock_irq(&instances_lock);
+}
+
+void snd_efw_transaction_bus_reset(struct fw_unit *unit)
+{
+	struct transaction_queue *t;
+
+	spin_lock_irq(&transaction_queues_lock);
+	list_for_each_entry(t, &transaction_queues, list) {
+		if ((t->unit == unit) &&
+		    (t->state == STATE_PENDING)) {
+			t->state = STATE_BUS_RESET;
+			wake_up(&t->wait);
+		}
+	}
+	spin_unlock_irq(&transaction_queues_lock);
+}
+
+static struct fw_address_handler resp_register_handler = {
+	.length = SND_EFW_RESPONSE_MAXIMUM_BYTES,
+	.address_callback = efw_response
+};
+
+int snd_efw_transaction_register(void)
+{
+	static const struct fw_address_region resp_register_region = {
+		.start	= MEMORY_SPACE_EFW_RESPONSE,
+		.end	= MEMORY_SPACE_EFW_RESPONSE +
+			  SND_EFW_RESPONSE_MAXIMUM_BYTES
+	};
+	return fw_core_add_address_handler(&resp_register_handler,
+					   &resp_register_region);
+}
+
+void snd_efw_transaction_unregister(void)
+{
+	WARN_ON(!list_empty(&transaction_queues));
+	fw_core_remove_address_handler(&resp_register_handler);
+}