v4.19.13 snapshot.
diff --git a/sound/pci/asihpi/hpios.c b/sound/pci/asihpi/hpios.c
new file mode 100644
index 0000000..5ef4fe9
--- /dev/null
+++ b/sound/pci/asihpi/hpios.c
@@ -0,0 +1,83 @@
+/******************************************************************************
+
+ AudioScience HPI driver
+ Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of version 2 of the GNU General Public License as
+ published by the Free Software Foundation;
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+HPI Operating System function implementation for Linux
+
+(C) Copyright AudioScience Inc. 1997-2003
+******************************************************************************/
+#define SOURCEFILE_NAME "hpios.c"
+#include "hpi_internal.h"
+#include "hpidebug.h"
+#include <linux/delay.h>
+#include <linux/sched.h>
+
+void hpios_delay_micro_seconds(u32 num_micro_sec)
+{
+ if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
+ /* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
+ schedule_timeout_uninterruptible(usecs_to_jiffies
+ (num_micro_sec));
+ } else if (num_micro_sec <= 2000)
+ udelay(num_micro_sec);
+ else
+ mdelay(num_micro_sec / 1000);
+
+}
+
+/** Allocate an area of locked memory for bus master DMA operations.
+
+If allocation fails, return 1, and *pMemArea.size = 0
+*/
+u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
+ struct pci_dev *pdev)
+{
+ /*?? any benefit in using managed dmam_alloc_coherent? */
+ p_mem_area->vaddr =
+ dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
+ GFP_DMA32 | GFP_KERNEL);
+
+ if (p_mem_area->vaddr) {
+ HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
+ size, (unsigned int)p_mem_area->dma_handle,
+ p_mem_area->vaddr);
+ p_mem_area->pdev = &pdev->dev;
+ p_mem_area->size = size;
+ return 0;
+ } else {
+ HPI_DEBUG_LOG(WARNING,
+ "failed to allocate %d bytes locked memory\n", size);
+ p_mem_area->size = 0;
+ return 1;
+ }
+}
+
+u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
+{
+ if (p_mem_area->size) {
+ dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
+ p_mem_area->vaddr, p_mem_area->dma_handle);
+ HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
+ (unsigned long)p_mem_area->size,
+ (unsigned int)p_mem_area->dma_handle,
+ p_mem_area->vaddr);
+ p_mem_area->size = 0;
+ return 0;
+ } else {
+ return 1;
+ }
+}