[alsa-devel] [PATCH 04/11] ALSA: bebob: use normalized representation for the type of clock source
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sun Jun 14 05:49:30 CEST 2015
This commit changes function prototype and its processing. As a result,
function caller can execute additional processing according to detected
clock source.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/bebob/bebob.h | 4 ++--
sound/firewire/bebob/bebob_pcm.c | 11 ++++++++---
sound/firewire/bebob/bebob_proc.c | 22 ++++++++++++----------
sound/firewire/bebob/bebob_stream.c | 27 +++++++++++----------------
4 files changed, 33 insertions(+), 31 deletions(-)
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index 368b62d..73317d8 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -212,8 +212,8 @@ int avc_bridgeco_get_plug_strm_fmt(struct fw_unit *unit,
/* for AMDTP streaming */
int snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *rate);
int snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate);
-int snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob,
- bool *internal);
+int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
+ enum snd_bebob_clock_type *src);
int snd_bebob_stream_discover(struct snd_bebob *bebob);
int snd_bebob_stream_init_duplex(struct snd_bebob *bebob);
int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate);
diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
index 4a55561..e3f65a0 100644
--- a/sound/firewire/bebob/bebob_pcm.c
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -157,7 +157,7 @@ pcm_open(struct snd_pcm_substream *substream)
struct snd_bebob *bebob = substream->private_data;
struct snd_bebob_rate_spec *spec = bebob->spec->rate;
unsigned int sampling_rate;
- bool internal;
+ enum snd_bebob_clock_type src;
int err;
err = snd_bebob_stream_lock_try(bebob);
@@ -168,15 +168,20 @@ pcm_open(struct snd_pcm_substream *substream)
if (err < 0)
goto err_locked;
- err = snd_bebob_stream_check_internal_clock(bebob, &internal);
+ err = snd_bebob_stream_get_clock_src(bebob, &src);
if (err < 0)
goto err_locked;
+ /* SYT-Match is not supported. */
+ if (src == SND_BEBOB_CLOCK_TYPE_SYT) {
+ err = -EBUSY;
+ goto err_locked;
+ }
/*
* When source of clock is internal or any PCM stream are running,
* the available sampling rate is limited at current sampling rate.
*/
- if (!internal ||
+ if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
amdtp_stream_pcm_running(&bebob->tx_stream) ||
amdtp_stream_pcm_running(&bebob->rx_stream)) {
err = spec->get(bebob, &sampling_rate);
diff --git a/sound/firewire/bebob/bebob_proc.c b/sound/firewire/bebob/bebob_proc.c
index 335da64..301cc6a 100644
--- a/sound/firewire/bebob/bebob_proc.c
+++ b/sound/firewire/bebob/bebob_proc.c
@@ -132,25 +132,27 @@ static void
proc_read_clock(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
+ static const char *const clk_labels[] = {
+ "Internal",
+ "External",
+ "SYT-Match",
+ };
struct snd_bebob *bebob = entry->private_data;
struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
- unsigned int rate, id;
- bool internal;
+ enum snd_bebob_clock_type src;
+ unsigned int rate;
if (rate_spec->get(bebob, &rate) >= 0)
snd_iprintf(buffer, "Sampling rate: %d\n", rate);
- if (clk_spec) {
- if (clk_spec->get(bebob, &id) >= 0)
+ if (snd_bebob_stream_get_clock_src(bebob, &src) >= 0) {
+ if (clk_spec)
snd_iprintf(buffer, "Clock Source: %s\n",
- clk_spec->labels[id]);
- } else {
- if (snd_bebob_stream_check_internal_clock(bebob,
- &internal) >= 0)
+ clk_labels[src]);
+ else
snd_iprintf(buffer, "Clock Source: %s (MSU-dest: %d)\n",
- (internal) ? "Internal" : "External",
- bebob->sync_input_plug);
+ clk_labels[src], bebob->sync_input_plug);
}
}
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index 2ccef4ce..c8af8ff 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -116,8 +116,8 @@ end:
return err;
}
-int
-snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
+int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
+ enum snd_bebob_clock_type *src)
{
struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
@@ -125,8 +125,6 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
enum avc_bridgeco_plug_type type;
int err = 0;
- *internal = false;
-
/* 1.The device has its own operation to switch source of clock */
if (clk_spec) {
err = clk_spec->get(bebob, &id);
@@ -144,10 +142,7 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
goto end;
}
- if (strncmp(clk_spec->labels[id], SND_BEBOB_CLOCK_INTERNAL,
- strlen(SND_BEBOB_CLOCK_INTERNAL)) == 0)
- *internal = true;
-
+ *src = clk_spec->types[id];
goto end;
}
@@ -156,7 +151,7 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
* to use internal clock always
*/
if (bebob->sync_input_plug < 0) {
- *internal = true;
+ *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
@@ -179,7 +174,7 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
* Here check the first field. This field is used for direction.
*/
if (input[0] == 0xff) {
- *internal = true;
+ *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
@@ -192,7 +187,7 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
*/
if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&
input[2] == 0x0c) {
- *internal = true;
+ *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
/* The source from any input units is for several purposes. */
@@ -206,7 +201,7 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
* short, this driver is the master of
* synchronization.
*/
- err = -EIO;
+ *src = SND_BEBOB_CLOCK_TYPE_SYT;
goto end;
} else {
/*
@@ -214,7 +209,7 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
* means that the synchronization stream is not
* the Audio/MIDI compound stream.
*/
- *internal = false;
+ *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
goto end;
}
} else if (input[2] == AVC_BRIDGECO_PLUG_UNIT_EXT) {
@@ -233,18 +228,18 @@ snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
* SPDIF/ADAT or sometimes (not always) word
* clock.
*/
- *internal = false;
+ *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
goto end;
} else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
/* Often word clock. */
- *internal = false;
+ *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
goto end;
} else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {
/*
* Not standard.
* Mostly, additional internal clock.
*/
- *internal = true;
+ *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
goto end;
}
}
--
2.1.4
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