diff options
Diffstat (limited to 'sound/core/compress_offload.c')
-rw-r--r-- | sound/core/compress_offload.c | 128 |
1 files changed, 87 insertions, 41 deletions
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c index c84abc8..99db892 100644 --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -28,11 +28,13 @@ #include <linux/file.h> #include <linux/fs.h> #include <linux/list.h> +#include <linux/math64.h> #include <linux/mm.h> #include <linux/mutex.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/sched.h> +#include <linux/types.h> #include <linux/uio.h> #include <linux/uaccess.h> #include <linux/module.h> @@ -152,26 +154,23 @@ static int snd_compr_update_tstamp(struct snd_compr_stream *stream, stream->ops->pointer(stream, tstamp); pr_debug("dsp consumed till %d total %d bytes\n", tstamp->byte_offset, tstamp->copied_total); - stream->runtime->hw_pointer = tstamp->byte_offset; - stream->runtime->total_bytes_transferred = tstamp->copied_total; + if (stream->direction == SND_COMPRESS_PLAYBACK) + stream->runtime->total_bytes_transferred = tstamp->copied_total; + else + stream->runtime->total_bytes_available = tstamp->copied_total; return 0; } static size_t snd_compr_calc_avail(struct snd_compr_stream *stream, struct snd_compr_avail *avail) { - long avail_calc; /*this needs to be signed variable */ - memset(avail, 0, sizeof(*avail)); snd_compr_update_tstamp(stream, &avail->tstamp); /* Still need to return avail even if tstamp can't be filled in */ - /* FIXME: This needs to be different for capture stream, - available is # of compressed data, for playback it's - remainder of buffer */ - if (stream->runtime->total_bytes_available == 0 && - stream->runtime->state == SNDRV_PCM_STATE_SETUP) { + stream->runtime->state == SNDRV_PCM_STATE_SETUP && + stream->direction == SND_COMPRESS_PLAYBACK) { pr_debug("detected init and someone forgot to do a write\n"); return stream->runtime->buffer_size; } @@ -180,26 +179,22 @@ static size_t snd_compr_calc_avail(struct snd_compr_stream *stream, stream->runtime->total_bytes_transferred); if (stream->runtime->total_bytes_available == stream->runtime->total_bytes_transferred) { - pr_debug("both pointers are same, returning full avail\n"); - return stream->runtime->buffer_size; + if (stream->direction == SND_COMPRESS_PLAYBACK) { + pr_debug("both pointers are same, returning full avail\n"); + return stream->runtime->buffer_size; + } else { + pr_debug("both pointers are same, returning no avail\n"); + return 0; + } } - /* FIXME: this routine isn't consistent, in one test we use - * cumulative values and in the other byte offsets. Do we - * really need the byte offsets if the cumulative values have - * been updated? In the PCM interface app_ptr and hw_ptr are - * already cumulative */ + avail->avail = stream->runtime->total_bytes_available - + stream->runtime->total_bytes_transferred; + if (stream->direction == SND_COMPRESS_PLAYBACK) + avail->avail = stream->runtime->buffer_size - avail->avail; - avail_calc = stream->runtime->buffer_size - - (stream->runtime->app_pointer - stream->runtime->hw_pointer); - pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc, - stream->runtime->app_pointer, - stream->runtime->hw_pointer); - if (avail_calc >= stream->runtime->buffer_size) - avail_calc -= stream->runtime->buffer_size; - pr_debug("ret avail as %ld\n", avail_calc); - avail->avail = avail_calc; - return avail_calc; + pr_debug("ret avail as %lld\n", avail->avail); + return avail->avail; } static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) @@ -230,21 +225,24 @@ static int snd_compr_write_data(struct snd_compr_stream *stream, void *dstn; size_t copy; struct snd_compr_runtime *runtime = stream->runtime; + /* 64-bit Modulus */ + u64 app_pointer = div64_u64(runtime->total_bytes_available, + runtime->buffer_size); + app_pointer = runtime->total_bytes_available - + (app_pointer * runtime->buffer_size); - dstn = runtime->buffer + runtime->app_pointer; + dstn = runtime->buffer + app_pointer; pr_debug("copying %ld at %lld\n", - (unsigned long)count, runtime->app_pointer); - if (count < runtime->buffer_size - runtime->app_pointer) { + (unsigned long)count, app_pointer); + if (count < runtime->buffer_size - app_pointer) { if (copy_from_user(dstn, buf, count)) return -EFAULT; - runtime->app_pointer += count; } else { - copy = runtime->buffer_size - runtime->app_pointer; + copy = runtime->buffer_size - app_pointer; if (copy_from_user(dstn, buf, copy)) return -EFAULT; if (copy_from_user(runtime->buffer, buf + copy, count - copy)) return -EFAULT; - runtime->app_pointer = count - copy; } /* if DSP cares, let it know data has been written */ if (stream->ops->ack) @@ -278,10 +276,12 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf, if (avail > count) avail = count; - if (stream->ops->copy) - retval = stream->ops->copy(stream, buf, avail); - else + if (stream->ops->copy) { + char __user* cbuf = (char __user*)buf; + retval = stream->ops->copy(stream, cbuf, avail); + } else { retval = snd_compr_write_data(stream, buf, avail); + } if (retval > 0) stream->runtime->total_bytes_available += retval; @@ -300,7 +300,49 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf, static ssize_t snd_compr_read(struct file *f, char __user *buf, size_t count, loff_t *offset) { - return -ENXIO; + struct snd_compr_file *data = f->private_data; + struct snd_compr_stream *stream; + size_t avail; + int retval; + + if (snd_BUG_ON(!data)) + return -EFAULT; + + stream = &data->stream; + mutex_lock(&stream->device->lock); + + /* read is allowed when stream is running, paused, draining and setup + * (yes setup is state which we transition to after stop, so if user + * wants to read data after stop we allow that) + */ + switch (stream->runtime->state) { + case SNDRV_PCM_STATE_OPEN: + case SNDRV_PCM_STATE_PREPARED: + case SNDRV_PCM_STATE_XRUN: + case SNDRV_PCM_STATE_SUSPENDED: + case SNDRV_PCM_STATE_DISCONNECTED: + retval = -EBADFD; + goto out; + } + + avail = snd_compr_get_avail(stream); + pr_debug("avail returned %ld\n", (unsigned long)avail); + /* calculate how much we can read from buffer */ + if (avail > count) + avail = count; + + if (stream->ops->copy) { + retval = stream->ops->copy(stream, buf, avail); + } else { + retval = -ENXIO; + goto out; + } + if (retval > 0) + stream->runtime->total_bytes_transferred += retval; + +out: + mutex_unlock(&stream->device->lock); + return retval; } static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) @@ -375,6 +417,7 @@ snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg) if (!stream->ops->get_caps) return -ENXIO; + memset(&caps, 0, sizeof(caps)); retval = stream->ops->get_caps(stream, &caps); if (retval) goto out; @@ -393,7 +436,7 @@ snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg) if (!stream->ops->get_codec_caps) return -ENXIO; - caps = kmalloc(sizeof(*caps), GFP_KERNEL); + caps = kzalloc(sizeof(*caps), GFP_KERNEL); if (!caps) return -ENOMEM; @@ -485,9 +528,14 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) retval = stream->ops->set_params(stream, params); if (retval) goto out; - stream->runtime->state = SNDRV_PCM_STATE_SETUP; + stream->metadata_set = false; stream->next_track = false; + + if (stream->direction == SND_COMPRESS_PLAYBACK) + stream->runtime->state = SNDRV_PCM_STATE_SETUP; + else + stream->runtime->state = SNDRV_PCM_STATE_PREPARED; } else { return -EPERM; } @@ -505,7 +553,7 @@ snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg) if (!stream->ops->get_params) return -EBADFD; - params = kmalloc(sizeof(*params), GFP_KERNEL); + params = kzalloc(sizeof(*params), GFP_KERNEL); if (!params) return -ENOMEM; retval = stream->ops->get_params(stream, params); @@ -622,8 +670,6 @@ static int snd_compr_stop(struct snd_compr_stream *stream) if (!retval) { stream->runtime->state = SNDRV_PCM_STATE_SETUP; wake_up(&stream->runtime->sleep); - stream->runtime->hw_pointer = 0; - stream->runtime->app_pointer = 0; stream->runtime->total_bytes_available = 0; stream->runtime->total_bytes_transferred = 0; } |