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-rw-r--r--sound/firewire/lib.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/sound/firewire/lib.c b/sound/firewire/lib.c
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--- /dev/null
+++ b/sound/firewire/lib.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * miscellaneous helper functions
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/firewire.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "lib.h"
+
+#define ERROR_RETRY_DELAY_MS 20
+
+/**
+ * snd_fw_transaction - send a request and wait for its completion
+ * @unit: the driver's unit on the target device
+ * @tcode: the transaction code
+ * @offset: the address in the target's address space
+ * @buffer: input/output data
+ * @length: length of @buffer
+ * @flags: use %FW_FIXED_GENERATION and add the generation value to attempt the
+ * request only in that generation; use %FW_QUIET to suppress error
+ * messages
+ *
+ * Submits an asynchronous request to the target device, and waits for the
+ * response. The node ID and the current generation are derived from @unit.
+ * On a bus reset or an error, the transaction is retried a few times.
+ * Returns zero on success, or a negative error code.
+ */
+int snd_fw_transaction(struct fw_unit *unit, int tcode,
+ u64 offset, void *buffer, size_t length,
+ unsigned int flags)
+{
+ struct fw_device *device = fw_parent_device(unit);
+ int generation, rcode, tries = 0;
+
+ generation = flags & FW_GENERATION_MASK;
+ for (;;) {
+ if (!(flags & FW_FIXED_GENERATION)) {
+ generation = device->generation;
+ smp_rmb(); /* node_id vs. generation */
+ }
+ rcode = fw_run_transaction(device->card, tcode,
+ device->node_id, generation,
+ device->max_speed, offset,
+ buffer, length);
+
+ if (rcode == RCODE_COMPLETE)
+ return 0;
+
+ if (rcode == RCODE_GENERATION && (flags & FW_FIXED_GENERATION))
+ return -EAGAIN;
+
+ if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
+ if (!(flags & FW_QUIET))
+ dev_err(&unit->device,
+ "transaction failed: %s\n",
+ fw_rcode_string(rcode));
+ return -EIO;
+ }
+
+ msleep(ERROR_RETRY_DELAY_MS);
+ }
+}
+EXPORT_SYMBOL(snd_fw_transaction);
+
+MODULE_DESCRIPTION("FireWire audio helper functions");
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_LICENSE("GPL v2");