ALSA: oxfw: add support for capturing PCM samples

In previous commit, a support for transmitted packets is added. This commit
add a support for capturing PCM samples.

When any streams are already started, this driver should not change sampling
rate of the device, thus this commit also adds a restriction of sampling rate
in this situation.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 180 insertions, 20 deletions

diff --git a/sound/firewire/oxfw/oxfw-pcm.c b/sound/firewire/oxfw/oxfw-pcm.c
index a78339c81de8..e84fc9c4bfd1 100644
--- a/sound/firewire/oxfw/oxfw-pcm.c
+++ b/sound/firewire/oxfw/oxfw-pcm.c
@@ -118,21 +118,31 @@ static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
         hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
 }
 
-static int pcm_open(struct snd_pcm_substream *substream)
+static int init_hw_params(struct snd_oxfw *oxfw,
+                          struct snd_pcm_substream *substream)
 {
-        struct snd_oxfw *oxfw = substream->private_data;
         struct snd_pcm_runtime *runtime = substream->runtime;
         u8 **formats;
+        struct amdtp_stream *stream;
         int err;
 
-        formats = oxfw->rx_stream_formats;
-
         runtime->hw.info = SNDRV_PCM_INFO_BATCH |
                            SNDRV_PCM_INFO_BLOCK_TRANSFER |
                            SNDRV_PCM_INFO_INTERLEAVED |
+                           SNDRV_PCM_INFO_JOINT_DUPLEX |
                            SNDRV_PCM_INFO_MMAP |
                            SNDRV_PCM_INFO_MMAP_VALID;
 
+        if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+                runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
+                stream = &oxfw->tx_stream;
+                formats = oxfw->tx_stream_formats;
+        } else {
+                runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
+                stream = &oxfw->rx_stream;
+                formats = oxfw->rx_stream_formats;
+        }
+
         limit_channels_and_rates(&runtime->hw, formats);
         limit_period_and_buffer(&runtime->hw);
 
@@ -148,10 +158,55 @@ static int pcm_open(struct snd_pcm_substream *substream)
         if (err < 0)
                 goto end;
 
-        err = amdtp_stream_add_pcm_hw_constraints(&oxfw->rx_stream, runtime);
+        err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
+end:
+        return err;
+}
+
+static int limit_to_current_params(struct snd_pcm_substream *substream)
+{
+        struct snd_oxfw *oxfw = substream->private_data;
+        struct snd_oxfw_stream_formation formation;
+        enum avc_general_plug_dir dir;
+        int err;
+
+        if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+                dir = AVC_GENERAL_PLUG_DIR_OUT;
+        else
+                dir = AVC_GENERAL_PLUG_DIR_IN;
+
+        err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
+        if (err < 0)
+                goto end;
+
+        substream->runtime->hw.channels_min = formation.pcm;
+        substream->runtime->hw.channels_max = formation.pcm;
+        substream->runtime->hw.rate_min = formation.rate;
+        substream->runtime->hw.rate_max = formation.rate;
+end:
+        return err;
+}
+
+static int pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_oxfw *oxfw = substream->private_data;
+        int err;
+
+        err = init_hw_params(oxfw, substream);
         if (err < 0)
                 goto end;
 
+        /*
+         * When any PCM streams are already running, the available sampling
+         * rate is limited at current value.
+         */
+        if (amdtp_stream_pcm_running(&oxfw->tx_stream) ||
+            amdtp_stream_pcm_running(&oxfw->rx_stream)) {
+                err = limit_to_current_params(substream);
+                if (err < 0)
+                        goto end;
+        }
+
         snd_pcm_set_sync(substream);
 end:
         return err;
@@ -162,28 +217,89 @@ static int pcm_close(struct snd_pcm_substream *substream)
         return 0;
 }
 
-static int pcm_hw_params(struct snd_pcm_substream *substream,
-                         struct snd_pcm_hw_params *hw_params)
+static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
+                                 struct snd_pcm_hw_params *hw_params)
 {
         struct snd_oxfw *oxfw = substream->private_data;
 
+
+        if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+                mutex_lock(&oxfw->mutex);
+                oxfw->capture_substreams++;
+                mutex_unlock(&oxfw->mutex);
+        }
+
+        amdtp_stream_set_pcm_format(&oxfw->tx_stream, params_format(hw_params));
+
+        return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+                                                params_buffer_bytes(hw_params));
+}
+static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
+                                  struct snd_pcm_hw_params *hw_params)
+{
+        struct snd_oxfw *oxfw = substream->private_data;
+
+        if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+                mutex_lock(&oxfw->mutex);
+                oxfw->playback_substreams++;
+                mutex_unlock(&oxfw->mutex);
+        }
+
         amdtp_stream_set_pcm_format(&oxfw->rx_stream, params_format(hw_params));
+
         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
                                                 params_buffer_bytes(hw_params));
 }
 
-static int pcm_hw_free(struct snd_pcm_substream *substream)
+static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_oxfw *oxfw = substream->private_data;
+
+        mutex_lock(&oxfw->mutex);
+
+        if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+                oxfw->capture_substreams--;
+
+        snd_oxfw_stream_stop_simplex(oxfw, &oxfw->tx_stream);
+
+        mutex_unlock(&oxfw->mutex);
+
+        return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
 {
         struct snd_oxfw *oxfw = substream->private_data;
 
         mutex_lock(&oxfw->mutex);
+
+        if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+                oxfw->playback_substreams--;
+
         snd_oxfw_stream_stop_simplex(oxfw, &oxfw->rx_stream);
+
         mutex_unlock(&oxfw->mutex);
 
         return snd_pcm_lib_free_vmalloc_buffer(substream);
 }
 
-static int pcm_prepare(struct snd_pcm_substream *substream)
+static int pcm_capture_prepare(struct snd_pcm_substream *substream)
+{
+        struct snd_oxfw *oxfw = substream->private_data;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int err;
+
+        mutex_lock(&oxfw->mutex);
+        err = snd_oxfw_stream_start_simplex(oxfw, &oxfw->tx_stream,
+                                            runtime->rate, runtime->channels);
+        mutex_unlock(&oxfw->mutex);
+        if (err < 0)
+                goto end;
+
+        amdtp_stream_pcm_prepare(&oxfw->tx_stream);
+end:
+        return err;
+}
+static int pcm_playback_prepare(struct snd_pcm_substream *substream)
 {
         struct snd_oxfw *oxfw = substream->private_data;
         struct snd_pcm_runtime *runtime = substream->runtime;
@@ -201,7 +317,25 @@ end:
         return err;
 }
 
-static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct snd_oxfw *oxfw = substream->private_data;
+        struct snd_pcm_substream *pcm;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                pcm = substream;
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+                pcm = NULL;
+                break;
+        default:
+                return -EINVAL;
+        }
+        amdtp_stream_pcm_trigger(&oxfw->tx_stream, pcm);
+        return 0;
+}
+static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 {
         struct snd_oxfw *oxfw = substream->private_data;
         struct snd_pcm_substream *pcm;
@@ -220,35 +354,61 @@ static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
         return 0;
 }
 
-static snd_pcm_uframes_t pcm_pointer(struct snd_pcm_substream *substream)
+static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstm)
 {
-        struct snd_oxfw *oxfw = substream->private_data;
+        struct snd_oxfw *oxfw = sbstm->private_data;
+
+        return amdtp_stream_pcm_pointer(&oxfw->tx_stream);
+}
+static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstm)
+{
+        struct snd_oxfw *oxfw = sbstm->private_data;
 
         return amdtp_stream_pcm_pointer(&oxfw->rx_stream);
 }
 
 int snd_oxfw_create_pcm(struct snd_oxfw *oxfw)
 {
-        static struct snd_pcm_ops ops = {
+        static struct snd_pcm_ops capture_ops = {
+                .open      = pcm_open,
+                .close     = pcm_close,
+                .ioctl     = snd_pcm_lib_ioctl,
+                .hw_params = pcm_capture_hw_params,
+                .hw_free   = pcm_capture_hw_free,
+                .prepare   = pcm_capture_prepare,
+                .trigger   = pcm_capture_trigger,
+                .pointer   = pcm_capture_pointer,
+                .page      = snd_pcm_lib_get_vmalloc_page,
+                .mmap      = snd_pcm_lib_mmap_vmalloc,
+        };
+        static struct snd_pcm_ops playback_ops = {
                 .open      = pcm_open,
                 .close     = pcm_close,
                 .ioctl     = snd_pcm_lib_ioctl,
-                .hw_params = pcm_hw_params,
-                .hw_free   = pcm_hw_free,
-                .prepare   = pcm_prepare,
-                .trigger   = pcm_trigger,
-                .pointer   = pcm_pointer,
+                .hw_params = pcm_playback_hw_params,
+                .hw_free   = pcm_playback_hw_free,
+                .prepare   = pcm_playback_prepare,
+                .trigger   = pcm_playback_trigger,
+                .pointer   = pcm_playback_pointer,
                 .page      = snd_pcm_lib_get_vmalloc_page,
                 .mmap      = snd_pcm_lib_mmap_vmalloc,
         };
         struct snd_pcm *pcm;
+        unsigned int cap = 0;
         int err;
 
-        err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, 0, &pcm);
+        if (oxfw->has_output)
+                cap = 1;
+
+        err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, cap, &pcm);
         if (err < 0)
                 return err;
+
         pcm->private_data = oxfw;
         strcpy(pcm->name, oxfw->card->shortname);
-        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &ops);
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
+        if (cap > 0)
+                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
+
         return 0;
 }