Merge remote-tracking branch 'sound-current/for-linus'

[karo-tx-linux.git] / sound / firewire / lib.c

diff --git a/sound/firewire/lib.c b/sound/firewire/lib.c
index 7409edba9f06761b11d8582bd60fb43bcc8a0ff6..f80aafa44c89499ff92b0b3af0bc761ca49c0567 100644 (file)
--- a/sound/firewire/lib.c
+++ b/sound/firewire/lib.c
@@ -9,6 +9,7 @@
 #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
@@ -66,6 +67,147 @@ int snd_fw_transaction(struct fw_unit *unit, int tcode,
 }
 EXPORT_SYMBOL(snd_fw_transaction);
 
+static void async_midi_port_callback(struct fw_card *card, int rcode,
+                                    void *data, size_t length,
+                                    void *callback_data)
+{
+       struct snd_fw_async_midi_port *port = callback_data;
+       struct snd_rawmidi_substream *substream = ACCESS_ONCE(port->substream);
+
+       /* This port is closed. */
+       if (substream == NULL)
+               return;
+
+       if (rcode == RCODE_COMPLETE)
+               snd_rawmidi_transmit_ack(substream, port->consume_bytes);
+       else if (!rcode_is_permanent_error(rcode))
+               /* To start next transaction immediately for recovery. */
+               port->next_ktime = ktime_set(0, 0);
+       else
+               /* Don't continue processing. */
+               port->error = true;
+
+       port->idling = true;
+
+       if (!snd_rawmidi_transmit_empty(substream))
+               schedule_work(&port->work);
+}
+
+static void midi_port_work(struct work_struct *work)
+{
+       struct snd_fw_async_midi_port *port =
+                       container_of(work, struct snd_fw_async_midi_port, work);
+       struct snd_rawmidi_substream *substream = ACCESS_ONCE(port->substream);
+       int generation;
+       int type;
+
+       /* Under transacting or error state. */
+       if (!port->idling || port->error)
+               return;
+
+       /* Nothing to do. */
+       if (substream == NULL || snd_rawmidi_transmit_empty(substream))
+               return;
+
+       /* Do it in next chance. */
+       if (ktime_after(port->next_ktime, ktime_get())) {
+               schedule_work(&port->work);
+               return;
+       }
+
+       /*
+        * Fill the buffer. The callee must use snd_rawmidi_transmit_peek().
+        * Later, snd_rawmidi_transmit_ack() is called.
+        */
+       memset(port->buf, 0, port->len);
+       port->consume_bytes = port->fill(substream, port->buf);
+       if (port->consume_bytes <= 0) {
+               /* Do it in next chance, immediately. */
+               if (port->consume_bytes == 0) {
+                       port->next_ktime = ktime_set(0, 0);
+                       schedule_work(&port->work);
+               } else {
+                       /* Fatal error. */
+                       port->error = true;
+               }
+               return;
+       }
+
+       /* Calculate type of transaction. */
+       if (port->len == 4)
+               type = TCODE_WRITE_QUADLET_REQUEST;
+       else
+               type = TCODE_WRITE_BLOCK_REQUEST;
+
+       /* Set interval to next transaction. */
+       port->next_ktime = ktime_add_ns(ktime_get(),
+                               port->consume_bytes * 8 * NSEC_PER_SEC / 31250);
+
+       /* Start this transaction. */
+       port->idling = false;
+
+       /*
+        * In Linux FireWire core, when generation is updated with memory
+        * barrier, node id has already been updated. In this module, After
+        * this smp_rmb(), load/store instructions to memory are completed.
+        * Thus, both of generation and node id are available with recent
+        * values. This is a light-serialization solution to handle bus reset
+        * events on IEEE 1394 bus.
+        */
+       generation = port->parent->generation;
+       smp_rmb();
+
+       fw_send_request(port->parent->card, &port->transaction, type,
+                       port->parent->node_id, generation,
+                       port->parent->max_speed, port->addr,
+                       port->buf, port->len, async_midi_port_callback,
+                       port);
+}
+
+/**
+ * snd_fw_async_midi_port_init - initialize asynchronous MIDI port structure
+ * @port: the asynchronous MIDI port to initialize
+ * @unit: the target of the asynchronous transaction
+ * @addr: the address to which transactions are transferred
+ * @len: the length of transaction
+ * @fill: the callback function to fill given buffer, and returns the
+ *            number of consumed bytes for MIDI message.
+ *
+ */
+int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
+               struct fw_unit *unit, u64 addr, unsigned int len,
+               snd_fw_async_midi_port_fill fill)
+{
+       port->len = DIV_ROUND_UP(len, 4) * 4;
+       port->buf = kzalloc(port->len, GFP_KERNEL);
+       if (port->buf == NULL)
+               return -ENOMEM;
+
+       port->parent = fw_parent_device(unit);
+       port->addr = addr;
+       port->fill = fill;
+       port->idling = true;
+       port->next_ktime = ktime_set(0, 0);
+       port->error = false;
+
+       INIT_WORK(&port->work, midi_port_work);
+
+       return 0;
+}
+EXPORT_SYMBOL(snd_fw_async_midi_port_init);
+
+/**
+ * snd_fw_async_midi_port_destroy - free asynchronous MIDI port structure
+ * @port: the asynchronous MIDI port structure
+ */
+void snd_fw_async_midi_port_destroy(struct snd_fw_async_midi_port *port)
+{
+       snd_fw_async_midi_port_finish(port);
+       cancel_work_sync(&port->work);
+       kfree(port->buf);
+}
+EXPORT_SYMBOL(snd_fw_async_midi_port_destroy);
+
 MODULE_DESCRIPTION("FireWire audio helper functions");
 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
 MODULE_LICENSE("GPL v2");