1 files changed, 64 insertions, 2 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index c0ddb7e69c28..0cb7f3f5df7b 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -60,6 +60,9 @@ struct snd_pcm_hardware {
 
 struct snd_pcm_substream;
 
+struct snd_pcm_audio_tstamp_config; /* definitions further down */
+struct snd_pcm_audio_tstamp_report;
+
 struct snd_pcm_ops {
         int (*open)(struct snd_pcm_substream *substream);
         int (*close)(struct snd_pcm_substream *substream);
@@ -71,8 +74,10 @@ struct snd_pcm_ops {
         int (*prepare)(struct snd_pcm_substream *substream);
         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
-        int (*wall_clock)(struct snd_pcm_substream *substream,
-                          struct timespec *audio_ts);
+        int (*get_time_info)(struct snd_pcm_substream *substream,
+                        struct timespec *system_ts, struct timespec *audio_ts,
+                        struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
+                        struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
         int (*copy)(struct snd_pcm_substream *substream, int channel,
                     snd_pcm_uframes_t pos,
                     void __user *buf, snd_pcm_uframes_t count);
@@ -281,6 +286,58 @@ struct snd_pcm_hw_constraint_ranges {
 
 struct snd_pcm_hwptr_log;
 
+/*
+ * userspace-provided audio timestamp config to kernel,
+ * structure is for internal use only and filled with dedicated unpack routine
+ */
+struct snd_pcm_audio_tstamp_config {
+        /* 5 of max 16 bits used */
+        u32 type_requested:4;
+        u32 report_delay:1; /* add total delay to A/D or D/A */
+};
+
+static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
+                                                struct snd_pcm_audio_tstamp_config *config)
+{
+        config->type_requested = data & 0xF;
+        config->report_delay = (data >> 4) & 1;
+}
+
+/*
+ * kernel-provided audio timestamp report to user-space
+ * structure is for internal use only and read by dedicated pack routine
+ */
+struct snd_pcm_audio_tstamp_report {
+        /* 6 of max 16 bits used for bit-fields */
+
+        /* for backwards compatibility */
+        u32 valid:1;
+
+        /* actual type if hardware could not support requested timestamp */
+        u32 actual_type:4;
+
+        /* accuracy represented in ns units */
+        u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
+        u32 accuracy; /* up to 4.29s, will be packed in separate field  */
+};
+
+static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
+                                                const struct snd_pcm_audio_tstamp_report *report)
+{
+        u32 tmp;
+
+        tmp = report->accuracy_report;
+        tmp <<= 4;
+        tmp |= report->actual_type;
+        tmp <<= 1;
+        tmp |= report->valid;
+
+        *data &= 0xffff; /* zero-clear MSBs */
+        *data |= (tmp << 16);
+        *accuracy = report->accuracy;
+}
+
+
 struct snd_pcm_runtime {
         /* -- Status -- */
         struct snd_pcm_substream *trigger_master;
@@ -361,6 +418,11 @@ struct snd_pcm_runtime {
 
         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 
+        /* -- audio timestamp config -- */
+        struct snd_pcm_audio_tstamp_config audio_tstamp_config;
+        struct snd_pcm_audio_tstamp_report audio_tstamp_report;
+        struct timespec driver_tstamp;
+
 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
         /* -- OSS things -- */
         struct snd_pcm_oss_runtime oss;