audio: MMAP NOIRQ mode shareable file descriptor
Derive a shareable file descriptor for the DMA buffer
used for MMAP NOIRQ
Change-Id: Ibdd633fad35ed397f6de746e5755a02522e39777
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index 2bdcf62..7778b2b 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -40,6 +40,10 @@
#include <dirent.h>
#include <linux/msm_audio.h>
+#if defined(PLATFORM_MSMFALCON)
+#include <sound/devdep_params.h>
+#endif
+
#ifdef DYNAMIC_LOG_ENABLED
#include <log_xml_parser.h>
#define LOG_MASK HAL_MOD_FILE_PLATFORM
@@ -7229,3 +7233,40 @@
return MAX_CODEC_BACKENDS;
}
+
+#if defined(PLATFORM_MSMFALCON)
+int platform_get_mmap_data_fd(void *platform, int fe_dev, int dir, int *fd,
+ uint32_t *size)
+{
+ struct platform_data *my_data = (struct platform_data *)platform;
+ struct audio_device *adev = my_data->adev;
+ int hw_fd = -1;
+ char dev_name[128];
+ struct snd_pcm_mmap_fd mmap_fd;
+ memset(&mmap_fd, 0, sizeof(mmap_fd));
+ mmap_fd.dir = dir;
+ snprintf(dev_name, sizeof(dev_name), "/dev/snd/hwC%uD%u",
+ adev->snd_card, HWDEP_FE_BASE+fe_dev);
+ hw_fd = open(dev_name, O_RDONLY);
+ if (hw_fd < 0) {
+ ALOGE("fe hw dep node open %d/%d failed", adev->snd_card, fe_dev);
+ return -1;
+ }
+ if (ioctl(hw_fd, SNDRV_PCM_IOCTL_MMAP_DATA_FD, &mmap_fd) < 0) {
+ ALOGE("fe hw dep node ioctl failed");
+ close(hw_fd);
+ return -1;
+ }
+ *fd = mmap_fd.fd;
+ *size = mmap_fd.size;
+ close(hw_fd); // mmap_fd should still be valid
+ return 0;
+}
+#else
+int platform_get_mmap_data_fd(void *platform __unused, int fe_dev __unused,
+ int dir __unused, int *fd __unused,
+ uint32_t *size __unused)
+{
+ return -1;
+}
+#endif