[alsa-devel] [PATCH 03/44] firewire-lib: Split some codes into functions to reuse for both streams
Takashi Sakamoto
o-takashi at sakamocchi.jp
Fri Mar 21 12:09:48 CET 2014
Some codes can be reused to handle in stream. This commit adds new functions.
This commit also renames some functions to keep naming consistency.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/amdtp.c | 154 ++++++++++++++++++++++++++-----------------------
1 file changed, 81 insertions(+), 73 deletions(-)
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 95c5a15..74b1045 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -47,6 +47,8 @@
#define INTERRUPT_INTERVAL 16
#define QUEUE_LENGTH 48
+#define OUT_PACKET_HEADER_SIZE 0
+
static void pcm_period_tasklet(unsigned long data);
/**
@@ -440,13 +442,73 @@ static void amdtp_fill_midi(struct amdtp_stream *s,
cpu_to_be32(0x80000000);
}
-static void queue_out_packet(struct amdtp_stream *s, unsigned int cycle)
+static void update_pcm_pointers(struct amdtp_stream *s,
+ struct snd_pcm_substream *pcm,
+ unsigned int frames)
+{ unsigned int ptr;
+
+ if (s->dual_wire)
+ frames *= 2;
+
+ ptr = s->pcm_buffer_pointer + frames;
+ if (ptr >= pcm->runtime->buffer_size)
+ ptr -= pcm->runtime->buffer_size;
+ ACCESS_ONCE(s->pcm_buffer_pointer) = ptr;
+
+ s->pcm_period_pointer += frames;
+ if (s->pcm_period_pointer >= pcm->runtime->period_size) {
+ s->pcm_period_pointer -= pcm->runtime->period_size;
+ s->pointer_flush = false;
+ tasklet_hi_schedule(&s->period_tasklet);
+ }
+}
+
+static void pcm_period_tasklet(unsigned long data)
+{
+ struct amdtp_stream *s = (void *)data;
+ struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
+
+ if (pcm)
+ snd_pcm_period_elapsed(pcm);
+}
+
+static int queue_packet(struct amdtp_stream *s,
+ unsigned int header_length,
+ unsigned int payload_length, bool skip)
+{
+ struct fw_iso_packet p = {0};
+ int err;
+
+ p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL);
+ p.tag = TAG_CIP;
+ p.header_length = header_length;
+ p.payload_length = (!skip) ? payload_length : 0;
+ p.skip = skip;
+ err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer,
+ s->buffer.packets[s->packet_index].offset);
+ if (err < 0) {
+ dev_err(&s->unit->device, "queueing error: %d\n", err);
+ goto end;
+ }
+
+ if (++s->packet_index >= QUEUE_LENGTH)
+ s->packet_index = 0;
+end:
+ return err;
+}
+
+static inline int queue_out_packet(struct amdtp_stream *s,
+ unsigned int payload_length, bool skip)
+{
+ return queue_packet(s, OUT_PACKET_HEADER_SIZE,
+ payload_length, skip);
+}
+
+static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle)
{
__be32 *buffer;
- unsigned int index, data_blocks, syt, ptr;
+ unsigned int index, data_blocks, syt, payload_length;
struct snd_pcm_substream *pcm;
- struct fw_iso_packet packet;
- int err;
if (s->packet_index < 0)
return;
@@ -479,55 +541,20 @@ static void queue_out_packet(struct amdtp_stream *s, unsigned int cycle)
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
- packet.payload_length = 8 + data_blocks * 4 * s->data_block_quadlets;
- packet.interrupt = IS_ALIGNED(index + 1, INTERRUPT_INTERVAL);
- packet.skip = 0;
- packet.tag = TAG_CIP;
- packet.sy = 0;
- packet.header_length = 0;
-
- err = fw_iso_context_queue(s->context, &packet, &s->buffer.iso_buffer,
- s->buffer.packets[index].offset);
- if (err < 0) {
- dev_err(&s->unit->device, "queueing error: %d\n", err);
+ payload_length = 8 + data_blocks * 4 * s->data_block_quadlets;
+ if (queue_out_packet(s, payload_length, false) < 0) {
s->packet_index = -1;
amdtp_stream_pcm_abort(s);
return;
}
- if (++index >= QUEUE_LENGTH)
- index = 0;
- s->packet_index = index;
-
- if (pcm) {
- if (s->dual_wire)
- data_blocks *= 2;
-
- ptr = s->pcm_buffer_pointer + data_blocks;
- if (ptr >= pcm->runtime->buffer_size)
- ptr -= pcm->runtime->buffer_size;
- ACCESS_ONCE(s->pcm_buffer_pointer) = ptr;
-
- s->pcm_period_pointer += data_blocks;
- if (s->pcm_period_pointer >= pcm->runtime->period_size) {
- s->pcm_period_pointer -= pcm->runtime->period_size;
- s->pointer_flush = false;
- tasklet_hi_schedule(&s->period_tasklet);
- }
- }
-}
-
-static void pcm_period_tasklet(unsigned long data)
-{
- struct amdtp_stream *s = (void *)data;
- struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
-
if (pcm)
- snd_pcm_period_elapsed(pcm);
+ update_pcm_pointers(s, pcm, data_blocks);
}
-static void out_packet_callback(struct fw_iso_context *context, u32 cycle,
- size_t header_length, void *header, void *private_data)
+static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
+ size_t header_length, void *header,
+ void *private_data)
{
struct amdtp_stream *s = private_data;
unsigned int i, packets = header_length / 4;
@@ -540,31 +567,10 @@ static void out_packet_callback(struct fw_iso_context *context, u32 cycle,
cycle += QUEUE_LENGTH - packets;
for (i = 0; i < packets; ++i)
- queue_out_packet(s, ++cycle);
+ handle_out_packet(s, ++cycle);
fw_iso_context_queue_flush(s->context);
}
-static int queue_initial_skip_packets(struct amdtp_stream *s)
-{
- struct fw_iso_packet skip_packet = {
- .skip = 1,
- };
- unsigned int i;
- int err;
-
- for (i = 0; i < QUEUE_LENGTH; ++i) {
- skip_packet.interrupt = IS_ALIGNED(s->packet_index + 1,
- INTERRUPT_INTERVAL);
- err = fw_iso_context_queue(s->context, &skip_packet, NULL, 0);
- if (err < 0)
- return err;
- if (++s->packet_index >= QUEUE_LENGTH)
- s->packet_index = 0;
- }
-
- return 0;
-}
-
/**
* amdtp_stream_start - start transferring packets
* @s: the AMDTP stream to start
@@ -594,7 +600,7 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
mutex_lock(&s->mutex);
if (WARN_ON(amdtp_stream_running(s) ||
- (!s->pcm_channels && !s->midi_ports))) {
+ (s->data_block_quadlets < 1))) {
err = -EBADFD;
goto err_unlock;
}
@@ -612,7 +618,7 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
FW_ISO_CONTEXT_TRANSMIT,
channel, speed, 0,
- out_packet_callback, s);
+ out_stream_callback, s);
if (IS_ERR(s->context)) {
err = PTR_ERR(s->context);
if (err == -EBUSY)
@@ -624,11 +630,13 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
amdtp_stream_update(s);
s->packet_index = 0;
- s->data_block_counter = 0;
- err = queue_initial_skip_packets(s);
- if (err < 0)
- goto err_context;
+ do {
+ err = queue_out_packet(s, 0, true);
+ if (err < 0)
+ goto err_context;
+ } while (s->packet_index > 0);
+ s->data_block_counter = 0;
err = fw_iso_context_start(s->context, -1, 0, 0);
if (err < 0)
goto err_context;
--
1.8.3.2
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