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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2015-09-19 11:21:53 +0900
committerTakashi Iwai <tiwai@suse.de>2015-09-29 12:35:48 +0200
commit414ba022a5287e9473c7fa2b4aa1b1025e9ca8be (patch)
treea92a9e5406537a12bd6296abdd62efeb4e76d94e
parent20e445771ea109bc0ce9e717cbf2475e56a141a8 (diff)
ALSA: firewire-lib: add support arbitrary value for fmt/fdf fields in CIP header
Some vendor specific protocol uses its own value for fmt/fdf fields in CIP header. This commit support to set arbitrary values for the fields. In IEC 61883-6, NO-DATA code is defined for FDF field. A packet with this code includes no data even if it includes some data blocks. This commit still leaves a condition to handle this special packet. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/firewire/amdtp.c31
-rw-r--r--sound/firewire/amdtp.h2
2 files changed, 25 insertions, 8 deletions
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 5a3a4529194a..b251f4b2b51c 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -59,8 +59,8 @@
* Audio and Music transfer protocol specific parameters
* only "Clock-based rate control mode" is supported
*/
-#define CIP_FMT_AM (0x10 << CIP_FMT_SHIFT)
-#define AMDTP_FDF_AM824 (0 << (CIP_FDF_SHIFT + 3))
+#define CIP_FMT_AM 0x10
+#define AMDTP_FDF_AM824 0x00
#define AMDTP_FDF_NO_DATA 0xff
/* TODO: make these configurable */
@@ -94,6 +94,8 @@ int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
s->callbacked = false;
s->sync_slave = NULL;
+ s->fmt = CIP_FMT_AM;
+
return 0;
}
EXPORT_SYMBOL(amdtp_stream_init);
@@ -225,6 +227,8 @@ int amdtp_stream_set_parameters(struct amdtp_stream *s,
s->data_block_quadlets = s->pcm_channels + midi_channels;
s->midi_ports = midi_ports;
+ s->fdf = AMDTP_FDF_AM824 | s->sfc;
+
/*
* In IEC 61883-6, one data block represents one event. In ALSA, one
* event equals to one PCM frame. But Dice has a quirk at higher
@@ -691,8 +695,10 @@ static int handle_out_packet(struct amdtp_stream *s, unsigned int data_blocks,
buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
(s->data_block_quadlets << CIP_DBS_SHIFT) |
s->data_block_counter);
- buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 |
- (s->sfc << CIP_FDF_SHIFT) | syt);
+ buffer[1] = cpu_to_be32(CIP_EOH |
+ ((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) |
+ ((s->fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) |
+ (syt & CIP_SYT_MASK));
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
@@ -732,6 +738,7 @@ static int handle_in_packet(struct amdtp_stream *s,
unsigned int *data_blocks, unsigned int syt)
{
u32 cip_header[2];
+ unsigned int fmt, fdf;
unsigned int data_block_quadlets, data_block_counter, dbc_interval;
struct snd_pcm_substream *pcm;
unsigned int pcm_frames;
@@ -745,8 +752,7 @@ static int handle_in_packet(struct amdtp_stream *s,
* For convenience, also check FMT field is AM824 or not.
*/
if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
- ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) ||
- ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) {
+ ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) {
dev_info_ratelimited(&s->unit->device,
"Invalid CIP header for AMDTP: %08X:%08X\n",
cip_header[0], cip_header[1]);
@@ -755,10 +761,19 @@ static int handle_in_packet(struct amdtp_stream *s,
goto end;
}
+ /* Check valid protocol or not. */
+ fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT;
+ if (fmt != s->fmt) {
+ dev_err(&s->unit->device,
+ "Detect unexpected protocol: %08x %08x\n",
+ cip_header[0], cip_header[1]);
+ return -EIO;
+ }
+
/* Calculate data blocks */
+ fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT;
if (payload_quadlets < 3 ||
- ((cip_header[1] & CIP_FDF_MASK) ==
- (AMDTP_FDF_NO_DATA << CIP_FDF_SHIFT))) {
+ (fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) {
*data_blocks = 0;
} else {
data_block_quadlets =
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index 65229258bd24..883bb1a7e25f 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -128,6 +128,8 @@ struct amdtp_stream {
unsigned int source_node_id_field;
unsigned int data_block_quadlets;
unsigned int data_block_counter;
+ unsigned int fmt;
+ unsigned int fdf;
/* quirk: fixed interval of dbc between previos/current packets. */
unsigned int tx_dbc_interval;
/* quirk: indicate the value of dbc field in a first packet. */