#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
+#include <linux/export.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
+#include <sound/soc-dpcm.h>
#include <sound/initval.h>
+#define DPCM_MAX_BE_USERS 8
+
+/* DPCM stream event, send event to FE and all active BEs. */
+static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
+ int event)
+{
+ struct snd_soc_dpcm *dpcm;
+
+ list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+
+ dev_dbg(be->dev, "pm: BE %s event %d dir %d\n",
+ be->dai_link->name, event, dir);
+
+ snd_soc_dapm_stream_event(be, dir, event);
+ }
+
+ snd_soc_dapm_stream_event(fe, dir, event);
+
+ return 0;
+}
+
static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
struct snd_soc_dai *soc_dai)
{
}
}
+ /* Dynamic PCM DAI links compat checks use dynamic capabilities */
+ if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
+ goto dynamic;
+
/* Check that the codec and cpu DAIs are compatible */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
runtime->hw.rate_min =
pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
runtime->hw.rate_max);
+dynamic:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
cpu_dai->playback_active++;
codec_dai->playback_active++;
return offset;
}
+/* connect a FE and BE */
+static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+
+ /* only add new dpcms */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+ if (dpcm->be == be && dpcm->fe == fe)
+ return 0;
+ }
+
+ dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
+ if (!dpcm)
+ return -ENOMEM;
+
+ dpcm->be = be;
+ dpcm->fe = fe;
+ be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
+ dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
+ list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
+ list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
+
+ dev_dbg(fe->dev, " connected new DPCM %s path %s %s %s\n",
+ stream ? "capture" : "playback", fe->dai_link->name,
+ stream ? "<-" : "->", be->dai_link->name);
+
+ return 1;
+}
+
+/* reparent a BE onto another FE */
+static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+ struct snd_pcm_substream *fe_substream, *be_substream;
+
+ /* reparent if BE is connected to other FEs */
+ if (!be->dpcm[stream].users)
+ return;
+
+ be_substream = snd_soc_dpcm_get_substream(be, stream);
+
+ list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
+ if (dpcm->fe == fe)
+ continue;
+
+ dev_dbg(fe->dev, " reparent %s path %s %s %s\n",
+ stream ? "capture" : "playback",
+ dpcm->fe->dai_link->name,
+ stream ? "<-" : "->", dpcm->be->dai_link->name);
+
+ fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
+ be_substream->runtime = fe_substream->runtime;
+ break;
+ }
+}
+
+/* disconnect a BE and FE */
+static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm, *d;
+
+ list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
+ dev_dbg(fe->dev, "BE %s disconnect check for %s\n",
+ stream ? "capture" : "playback",
+ dpcm->be->dai_link->name);
+
+ if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
+ continue;
+
+ dev_dbg(fe->dev, " freed DSP %s path %s %s %s\n",
+ stream ? "capture" : "playback", fe->dai_link->name,
+ stream ? "<-" : "->", dpcm->be->dai_link->name);
+
+ /* BEs still alive need new FE */
+ dpcm_be_reparent(fe, dpcm->be, stream);
+
+ list_del(&dpcm->list_be);
+ list_del(&dpcm->list_fe);
+ kfree(dpcm);
+ }
+}
+
+/* get BE for DAI widget and stream */
+static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
+ struct snd_soc_dapm_widget *widget, int stream)
+{
+ struct snd_soc_pcm_runtime *be;
+ int i;
+
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ for (i = 0; i < card->num_links; i++) {
+ be = &card->rtd[i];
+
+ if (be->cpu_dai->playback_widget == widget ||
+ be->codec_dai->playback_widget == widget)
+ return be;
+ }
+ } else {
+
+ for (i = 0; i < card->num_links; i++) {
+ be = &card->rtd[i];
+
+ if (be->cpu_dai->capture_widget == widget ||
+ be->codec_dai->capture_widget == widget)
+ return be;
+ }
+ }
+
+ dev_err(card->dev, "can't get %s BE for %s\n",
+ stream ? "capture" : "playback", widget->name);
+ return NULL;
+}
+
+static inline struct snd_soc_dapm_widget *
+ rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
+{
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ return rtd->cpu_dai->playback_widget;
+ else
+ return rtd->cpu_dai->capture_widget;
+}
+
+static inline struct snd_soc_dapm_widget *
+ rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
+{
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ return rtd->codec_dai->playback_widget;
+ else
+ return rtd->codec_dai->capture_widget;
+}
+
+static int widget_in_list(struct snd_soc_dapm_widget_list *list,
+ struct snd_soc_dapm_widget *widget)
+{
+ int i;
+
+ for (i = 0; i < list->num_widgets; i++) {
+ if (widget == list->widgets[i])
+ return 1;
+ }
+
+ return 0;
+}
+
+static int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
+ int stream, struct snd_soc_dapm_widget_list **list_)
+{
+ struct snd_soc_dai *cpu_dai = fe->cpu_dai;
+ struct snd_soc_dapm_widget_list *list;
+ int paths;
+
+ list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
+ sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
+ if (list == NULL)
+ return -ENOMEM;
+
+ /* get number of valid DAI paths and their widgets */
+ paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
+
+ dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
+ stream ? "capture" : "playback");
+
+ *list_ = list;
+ return paths;
+}
+
+static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
+{
+ kfree(*list);
+}
+
+static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
+ struct snd_soc_dapm_widget_list **list_)
+{
+ struct snd_soc_dpcm *dpcm;
+ struct snd_soc_dapm_widget_list *list = *list_;
+ struct snd_soc_dapm_widget *widget;
+ int prune = 0;
+
+ /* Destroy any old FE <--> BE connections */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ /* is there a valid CPU DAI widget for this BE */
+ widget = rtd_get_cpu_widget(dpcm->be, stream);
+
+ /* prune the BE if it's no longer in our active list */
+ if (widget && widget_in_list(list, widget))
+ continue;
+
+ /* is there a valid CODEC DAI widget for this BE */
+ widget = rtd_get_codec_widget(dpcm->be, stream);
+
+ /* prune the BE if it's no longer in our active list */
+ if (widget && widget_in_list(list, widget))
+ continue;
+
+ dev_dbg(fe->dev, "pruning %s BE %s for %s\n",
+ stream ? "capture" : "playback",
+ dpcm->be->dai_link->name, fe->dai_link->name);
+ dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+ dpcm->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
+ prune++;
+ }
+
+ dev_dbg(fe->dev, "found %d old BE paths for pruning\n", prune);
+ return prune;
+}
+
+static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
+ struct snd_soc_dapm_widget_list **list_)
+{
+ struct snd_soc_card *card = fe->card;
+ struct snd_soc_dapm_widget_list *list = *list_;
+ struct snd_soc_pcm_runtime *be;
+ int i, new = 0, err;
+
+ /* Create any new FE <--> BE connections */
+ for (i = 0; i < list->num_widgets; i++) {
+
+ if (list->widgets[i]->id != snd_soc_dapm_dai)
+ continue;
+
+ /* is there a valid BE rtd for this widget */
+ be = dpcm_get_be(card, list->widgets[i], stream);
+ if (!be) {
+ dev_err(fe->dev, "no BE found for %s\n",
+ list->widgets[i]->name);
+ continue;
+ }
+
+ /* make sure BE is a real BE */
+ if (!be->dai_link->no_pcm)
+ continue;
+
+ /* don't connect if FE is not running */
+ if (!fe->dpcm[stream].runtime)
+ continue;
+
+ /* newly connected FE and BE */
+ err = dpcm_be_connect(fe, be, stream);
+ if (err < 0) {
+ dev_err(fe->dev, "can't connect %s\n",
+ list->widgets[i]->name);
+ break;
+ } else if (err == 0) /* already connected */
+ continue;
+
+ /* new */
+ be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
+ new++;
+ }
+
+ dev_dbg(fe->dev, "found %d new BE paths\n", new);
+ return new;
+}
+
+/*
+ * Find the corresponding BE DAIs that source or sink audio to this
+ * FE substream.
+ */
+static int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
+ int stream, struct snd_soc_dapm_widget_list **list, int new)
+{
+ if (new)
+ return dpcm_add_paths(fe, stream, list);
+ else
+ return dpcm_prune_paths(fe, stream, list);
+}
+
+static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
+ dpcm->be->dpcm[stream].runtime_update =
+ SND_SOC_DPCM_UPDATE_NO;
+}
+
+static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
+ int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+
+ /* disable any enabled and non active backends */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ if (be->dpcm[stream].users == 0)
+ dev_err(be->dev, "no users %s at close - state %d\n",
+ stream ? "capture" : "playback",
+ be->dpcm[stream].state);
+
+ if (--be->dpcm[stream].users != 0)
+ continue;
+
+ if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
+ continue;
+
+ soc_pcm_close(be_substream);
+ be_substream->runtime = NULL;
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+ }
+}
+
+static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+ int err, count = 0;
+
+ /* only startup BE DAIs that are either sinks or sources to this FE DAI */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ /* is this op for this BE ? */
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ /* first time the dpcm is open ? */
+ if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
+ dev_err(be->dev, "too many users %s at open %d\n",
+ stream ? "capture" : "playback",
+ be->dpcm[stream].state);
+
+ if (be->dpcm[stream].users++ != 0)
+ continue;
+
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
+ continue;
+
+ dev_dbg(be->dev, "dpcm: open BE %s\n", be->dai_link->name);
+
+ be_substream->runtime = be->dpcm[stream].runtime;
+ err = soc_pcm_open(be_substream);
+ if (err < 0) {
+ dev_err(be->dev, "BE open failed %d\n", err);
+ be->dpcm[stream].users--;
+ if (be->dpcm[stream].users < 0)
+ dev_err(be->dev, "no users %s at unwind %d\n",
+ stream ? "capture" : "playback",
+ be->dpcm[stream].state);
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+ goto unwind;
+ }
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
+ count++;
+ }
+
+ return count;
+
+unwind:
+ /* disable any enabled and non active backends */
+ list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ if (be->dpcm[stream].users == 0)
+ dev_err(be->dev, "no users %s at close %d\n",
+ stream ? "capture" : "playback",
+ be->dpcm[stream].state);
+
+ if (--be->dpcm[stream].users != 0)
+ continue;
+
+ if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
+ continue;
+
+ soc_pcm_close(be_substream);
+ be_substream->runtime = NULL;
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+ }
+
+ return err;
+}
+
+void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
+ runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
+ runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
+ runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
+ runtime->hw.formats &= cpu_dai_drv->playback.formats;
+ runtime->hw.rates = cpu_dai_drv->playback.rates;
+ } else {
+ runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
+ runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
+ runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
+ runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
+ runtime->hw.formats &= cpu_dai_drv->capture.formats;
+ runtime->hw.rates = cpu_dai_drv->capture.rates;
+ }
+}
+
+static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
+{
+ struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
+ struct snd_pcm_runtime *runtime = fe_substream->runtime;
+ int stream = fe_substream->stream, ret = 0;
+
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+ ret = dpcm_be_dai_startup(fe, fe_substream->stream);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
+ goto be_err;
+ }
+
+ dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);
+
+ /* start the DAI frontend */
+ ret = soc_pcm_open(fe_substream);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
+ goto unwind;
+ }
+
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
+
+ dpcm_set_fe_runtime(fe_substream);
+ snd_pcm_limit_hw_rates(runtime);
+
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ return 0;
+
+unwind:
+ dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
+be_err:
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ return ret;
+}
+
+static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+
+ /* only shutdown BEs that are either sinks or sources to this FE DAI */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ /* is this op for this BE ? */
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ if (be->dpcm[stream].users == 0)
+ dev_err(be->dev, "no users %s at close - state %d\n",
+ stream ? "capture" : "playback",
+ be->dpcm[stream].state);
+
+ if (--be->dpcm[stream].users != 0)
+ continue;
+
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
+ continue;
+
+ dev_dbg(be->dev, "dpcm: close BE %s\n",
+ dpcm->fe->dai_link->name);
+
+ soc_pcm_close(be_substream);
+ be_substream->runtime = NULL;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+ }
+ return 0;
+}
+
+static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ int stream = substream->stream;
+
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+ /* shutdown the BEs */
+ dpcm_be_dai_shutdown(fe, substream->stream);
+
+ dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);
+
+ /* now shutdown the frontend */
+ soc_pcm_close(substream);
+
+ /* run the stream event for each BE */
+ dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
+
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ return 0;
+}
+
+static int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+
+ /* only hw_params backends that are either sinks or sources
+ * to this frontend DAI */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ /* is this op for this BE ? */
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ /* only free hw when no longer used - check all FEs */
+ if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ continue;
+
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
+ continue;
+
+ dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
+ dpcm->fe->dai_link->name);
+
+ soc_pcm_hw_free(be_substream);
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
+ }
+
+ return 0;
+}
+
+int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ int err, stream = substream->stream;
+
+ mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+ dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);
+
+ /* call hw_free on the frontend */
+ err = soc_pcm_hw_free(substream);
+ if (err < 0)
+ dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
+ fe->dai_link->name);
+
+ /* only hw_params backends that are either sinks or sources
+ * to this frontend DAI */
+ err = dpcm_be_dai_hw_free(fe, stream);
+
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+
+ mutex_unlock(&fe->card->mutex);
+ return 0;
+}
+
+static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+ int ret;
+
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ /* is this op for this BE ? */
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ /* only allow hw_params() if no connected FEs are running */
+ if (!snd_soc_dpcm_can_be_params(fe, be, stream))
+ continue;
+
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
+ continue;
+
+ dev_dbg(be->dev, "dpcm: hw_params BE %s\n",
+ dpcm->fe->dai_link->name);
+
+ /* copy params for each dpcm */
+ memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
+ sizeof(struct snd_pcm_hw_params));
+
+ /* perform any hw_params fixups */
+ if (be->dai_link->be_hw_params_fixup) {
+ ret = be->dai_link->be_hw_params_fixup(be,
+ &dpcm->hw_params);
+ if (ret < 0) {
+ dev_err(be->dev,
+ "dpcm: hw_params BE fixup failed %d\n",
+ ret);
+ goto unwind;
+ }
+ }
+
+ ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
+ if (ret < 0) {
+ dev_err(dpcm->be->dev,
+ "dpcm: hw_params BE failed %d\n", ret);
+ goto unwind;
+ }
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
+ }
+ return 0;
+
+unwind:
+ /* disable any enabled and non active backends */
+ list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ /* only allow hw_free() if no connected FEs are running */
+ if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ continue;
+
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
+ continue;
+
+ soc_pcm_hw_free(be_substream);
+ }
+
+ return ret;
+}
+
+int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ int ret, stream = substream->stream;
+
+ mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+ memcpy(&fe->dpcm[substream->stream].hw_params, params,
+ sizeof(struct snd_pcm_hw_params));
+ ret = dpcm_be_dai_hw_params(fe, substream->stream);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
+ goto out;
+ }
+
+ dev_dbg(fe->dev, "dpcm: hw_params FE %s rate %d chan %x fmt %d\n",
+ fe->dai_link->name, params_rate(params),
+ params_channels(params), params_format(params));
+
+ /* call hw_params on the frontend */
+ ret = soc_pcm_hw_params(substream, params);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
+ dpcm_be_dai_hw_free(fe, stream);
+ } else
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
+
+out:
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ mutex_unlock(&fe->card->mutex);
+ return ret;
+}
+
+static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
+ struct snd_pcm_substream *substream, int cmd)
+{
+ int ret;
+
+ dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
+ dpcm->fe->dai_link->name, cmd);
+
+ ret = soc_pcm_trigger(substream, cmd);
+ if (ret < 0)
+ dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);
+
+ return ret;
+}
+
+int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd)
+{
+ struct snd_soc_dpcm *dpcm;
+ int ret = 0;
+
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ /* is this op for this BE ? */
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
+ continue;
+
+ ret = dpcm_do_trigger(dpcm, be_substream, cmd);
+ if (ret)
+ return ret;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+ break;
+ case SNDRV_PCM_TRIGGER_RESUME:
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
+ continue;
+
+ ret = dpcm_do_trigger(dpcm, be_substream, cmd);
+ if (ret)
+ return ret;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
+ continue;
+
+ ret = dpcm_do_trigger(dpcm, be_substream, cmd);
+ if (ret)
+ return ret;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
+ continue;
+
+ if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ continue;
+
+ ret = dpcm_do_trigger(dpcm, be_substream, cmd);
+ if (ret)
+ return ret;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
+ break;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
+ continue;
+
+ if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ continue;
+
+ ret = dpcm_do_trigger(dpcm, be_substream, cmd);
+ if (ret)
+ return ret;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
+ break;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
+ continue;
+
+ if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ continue;
+
+ ret = dpcm_do_trigger(dpcm, be_substream, cmd);
+ if (ret)
+ return ret;
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
+ break;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
+
+int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ int stream = substream->stream, ret;
+ enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
+
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+ switch (trigger) {
+ case SND_SOC_DPCM_TRIGGER_PRE:
+ /* call trigger on the frontend before the backend. */
+
+ dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
+ fe->dai_link->name, cmd);
+
+ ret = soc_pcm_trigger(substream, cmd);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
+ goto out;
+ }
+
+ ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
+ break;
+ case SND_SOC_DPCM_TRIGGER_POST:
+ /* call trigger on the frontend after the backend. */
+
+ ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
+ goto out;
+ }
+
+ dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
+ fe->dai_link->name, cmd);
+
+ ret = soc_pcm_trigger(substream, cmd);
+ break;
+ default:
+ dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
+ fe->dai_link->name);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
+ break;
+ }
+
+out:
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ return ret;
+}
+
+static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+ int ret = 0;
+
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_pcm_substream *be_substream =
+ snd_soc_dpcm_get_substream(be, stream);
+
+ /* is this op for this BE ? */
+ if (!snd_soc_dpcm_be_can_update(fe, be, stream))
+ continue;
+
+ if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
+ (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
+ continue;
+
+ dev_dbg(be->dev, "dpcm: prepare BE %s\n",
+ dpcm->fe->dai_link->name);
+
+ ret = soc_pcm_prepare(be_substream);
+ if (ret < 0) {
+ dev_err(be->dev, "dpcm: backend prepare failed %d\n",
+ ret);
+ break;
+ }
+
+ be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
+ }
+ return ret;
+}
+
+int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ int stream = substream->stream, ret = 0;
+
+ mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
+
+ dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);
+
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+
+ /* there is no point preparing this FE if there are no BEs */
+ if (list_empty(&fe->dpcm[stream].be_clients)) {
+ dev_err(fe->dev, "dpcm: no backend DAIs enabled for %s\n",
+ fe->dai_link->name);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = dpcm_be_dai_prepare(fe, substream->stream);
+ if (ret < 0)
+ goto out;
+
+ /* call prepare on the frontend */
+ ret = soc_pcm_prepare(substream);
+ if (ret < 0) {
+ dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
+ fe->dai_link->name);
+ goto out;
+ }
+
+ /* run the stream event for each BE */
+ dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
+ fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
+
+out:
+ fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ mutex_unlock(&fe->card->mutex);
+
+ return ret;
+}
+
+
+int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
+{
+ struct snd_soc_dpcm *dpcm;
+ struct list_head *clients =
+ &fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
+
+ list_for_each_entry(dpcm, clients, list_be) {
+
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_soc_dai *dai = be->codec_dai;
+ struct snd_soc_dai_driver *drv = dai->driver;
+
+ if (be->dai_link->ignore_suspend)
+ continue;
+
+ dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);
+
+ if (drv->ops->digital_mute && dai->playback_active)
+ drv->ops->digital_mute(dai, mute);
+ }
+
+ return 0;
+}
+
+int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
+{
+ struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
+ struct snd_soc_dpcm *dpcm;
+ struct snd_soc_dapm_widget_list *list;
+ int ret;
+ int stream = fe_substream->stream;
+
+ mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
+ fe->dpcm[stream].runtime = fe_substream->runtime;
+
+ if (dpcm_path_get(fe, stream, &list) <= 0) {
+ dev_warn(fe->dev, "asoc: %s no valid %s route\n",
+ fe->dai_link->name, stream ? "capture" : "playback");
+ mutex_unlock(&fe->card->mutex);
+ return -EINVAL;
+ }
+
+ /* calculate valid and active FE <-> BE dpcms */
+ dpcm_process_paths(fe, stream, &list, 1);
+
+ ret = dpcm_fe_dai_startup(fe_substream);
+ if (ret < 0) {
+ /* clean up all links */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
+ dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+
+ dpcm_be_disconnect(fe, stream);
+ fe->dpcm[stream].runtime = NULL;
+ }
+
+ dpcm_clear_pending_state(fe, stream);
+ dpcm_path_put(&list);
+ mutex_unlock(&fe->card->mutex);
+ return ret;
+}
+
+int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
+{
+ struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
+ struct snd_soc_dpcm *dpcm;
+ int stream = fe_substream->stream, ret;
+
+ mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
+ ret = dpcm_fe_dai_shutdown(fe_substream);
+
+ /* mark FE's links ready to prune */
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
+ dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
+
+ dpcm_be_disconnect(fe, stream);
+
+ fe->dpcm[stream].runtime = NULL;
+ mutex_unlock(&fe->card->mutex);
+ return ret;
+}
+
/* create a new pcm */
int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
{
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
- struct snd_pcm_ops *soc_pcm_ops = &rtd->ops;
struct snd_pcm *pcm;
char new_name[64];
int ret = 0, playback = 0, capture = 0;
- soc_pcm_ops->open = soc_pcm_open;
- soc_pcm_ops->close = soc_pcm_close;
- soc_pcm_ops->hw_params = soc_pcm_hw_params;
- soc_pcm_ops->hw_free = soc_pcm_hw_free;
- soc_pcm_ops->prepare = soc_pcm_prepare;
- soc_pcm_ops->trigger = soc_pcm_trigger;
- soc_pcm_ops->pointer = soc_pcm_pointer;
-
- /* check client and interface hw capabilities */
- snprintf(new_name, sizeof(new_name), "%s %s-%d",
- rtd->dai_link->stream_name, codec_dai->name, num);
-
- if (codec_dai->driver->playback.channels_min)
- playback = 1;
- if (codec_dai->driver->capture.channels_min)
- capture = 1;
-
- dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
- ret = snd_pcm_new(rtd->card->snd_card, new_name,
- num, playback, capture, &pcm);
+ if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
+ if (cpu_dai->driver->playback.channels_min)
+ playback = 1;
+ if (cpu_dai->driver->capture.channels_min)
+ capture = 1;
+ } else {
+ if (codec_dai->driver->playback.channels_min)
+ playback = 1;
+ if (codec_dai->driver->capture.channels_min)
+ capture = 1;
+ }
+
+ /* create the PCM */
+ if (rtd->dai_link->no_pcm) {
+ snprintf(new_name, sizeof(new_name), "(%s)",
+ rtd->dai_link->stream_name);
+
+ ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
+ playback, capture, &pcm);
+ } else {
+ if (rtd->dai_link->dynamic)
+ snprintf(new_name, sizeof(new_name), "%s (*)",
+ rtd->dai_link->stream_name);
+ else
+ snprintf(new_name, sizeof(new_name), "%s %s-%d",
+ rtd->dai_link->stream_name, codec_dai->name, num);
+
+ ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
+ capture, &pcm);
+ }
if (ret < 0) {
printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
return ret;
}
+ dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
/* DAPM dai link stream work */
INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
rtd->pcm = pcm;
pcm->private_data = rtd;
+
+ if (rtd->dai_link->no_pcm) {
+ if (playback)
+ pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
+ if (capture)
+ pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
+ goto out;
+ }
+
+ /* ASoC PCM operations */
+ if (rtd->dai_link->dynamic) {
+ rtd->ops.open = dpcm_fe_dai_open;
+ rtd->ops.hw_params = dpcm_fe_dai_hw_params;
+ rtd->ops.prepare = dpcm_fe_dai_prepare;
+ rtd->ops.trigger = dpcm_fe_dai_trigger;
+ rtd->ops.hw_free = dpcm_fe_dai_hw_free;
+ rtd->ops.close = dpcm_fe_dai_close;
+ rtd->ops.pointer = soc_pcm_pointer;
+ } else {
+ rtd->ops.open = soc_pcm_open;
+ rtd->ops.hw_params = soc_pcm_hw_params;
+ rtd->ops.prepare = soc_pcm_prepare;
+ rtd->ops.trigger = soc_pcm_trigger;
+ rtd->ops.hw_free = soc_pcm_hw_free;
+ rtd->ops.close = soc_pcm_close;
+ rtd->ops.pointer = soc_pcm_pointer;
+ }
+
if (platform->driver->ops) {
- soc_pcm_ops->mmap = platform->driver->ops->mmap;
- soc_pcm_ops->pointer = platform->driver->ops->pointer;
- soc_pcm_ops->ioctl = platform->driver->ops->ioctl;
- soc_pcm_ops->copy = platform->driver->ops->copy;
- soc_pcm_ops->silence = platform->driver->ops->silence;
- soc_pcm_ops->ack = platform->driver->ops->ack;
- soc_pcm_ops->page = platform->driver->ops->page;
+ rtd->ops.ack = platform->driver->ops->ack;
+ rtd->ops.copy = platform->driver->ops->copy;
+ rtd->ops.silence = platform->driver->ops->silence;
+ rtd->ops.page = platform->driver->ops->page;
+ rtd->ops.mmap = platform->driver->ops->mmap;
}
if (playback)
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, soc_pcm_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
if (capture)
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, soc_pcm_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
if (platform->driver->pcm_new) {
ret = platform->driver->pcm_new(rtd);
}
pcm->private_free = platform->driver->pcm_free;
+out:
printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
cpu_dai->name);
return ret;
}
+
+/* is the current PCM operation for this FE ? */
+int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
+{
+ if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
+ return 1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
+
+/* is the current PCM operation for this BE ? */
+int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream)
+{
+ if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
+ ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
+ be->dpcm[stream].runtime_update))
+ return 1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
+
+/* get the substream for this BE */
+struct snd_pcm_substream *
+ snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
+{
+ return be->pcm->streams[stream].substream;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
+
+/* get the BE runtime state */
+enum snd_soc_dpcm_state
+ snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
+{
+ return be->dpcm[stream].state;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
+
+/* set the BE runtime state */
+void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
+ int stream, enum snd_soc_dpcm_state state)
+{
+ be->dpcm[stream].state = state;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
+
+/*
+ * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
+ * are not running, paused or suspended for the specified stream direction.
+ */
+int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+ int state;
+
+ list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
+
+ if (dpcm->fe == fe)
+ continue;
+
+ state = dpcm->fe->dpcm[stream].state;
+ if (state == SND_SOC_DPCM_STATE_START ||
+ state == SND_SOC_DPCM_STATE_PAUSED ||
+ state == SND_SOC_DPCM_STATE_SUSPEND)
+ return 0;
+ }
+
+ /* it's safe to free/stop this BE DAI */
+ return 1;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
+
+/*
+ * We can only change hw params a BE DAI if any of it's FE are not prepared,
+ * running, paused or suspended for the specified stream direction.
+ */
+int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream)
+{
+ struct snd_soc_dpcm *dpcm;
+ int state;
+
+ list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
+
+ if (dpcm->fe == fe)
+ continue;
+
+ state = dpcm->fe->dpcm[stream].state;
+ if (state == SND_SOC_DPCM_STATE_START ||
+ state == SND_SOC_DPCM_STATE_PAUSED ||
+ state == SND_SOC_DPCM_STATE_SUSPEND ||
+ state == SND_SOC_DPCM_STATE_PREPARE)
+ return 0;
+ }
+
+ /* it's safe to change hw_params */
+ return 1;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
projects / linux-beck.git / commitdiff