Changeset 50206e9 in mainline

Timestamp:

2018-01-31T17:02:48Z (6 years ago)

Author:

Ondřej Hlavatý <aearsis@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

4e17d54

Parents:

98893ede

Message:

libusb: add buffer allocation routines

Location:

uspace/lib/usbdev

Files:

• include/usb/dev/pipes.h (modified) (1 diff)
• src/pipes.c (modified) (2 diffs)

uspace/lib/usbdev/include/usb/dev/pipes.h

@@ -115 +115 @@
     const void *, size_t);
 
+void *usb_pipe_alloc_buffer(usb_pipe_t *, size_t);
+void usb_pipe_free_buffer(usb_pipe_t *, void *);
 #endif
 /**

uspace/lib/usbdev/src/pipes.c

@@ -36 +36 @@
 #include <usb/dev/request.h>
 #include <usb/usb.h>
+#include <usb/dma_buffer.h>
 
 #include <assert.h>
@@ -161 +162 @@
 }
 
+/**
+ * Allocate a buffer for data transmission, that satisfies the constraints
+ * imposed by the host controller.
+ *
+ * @param[in] pipe Pipe for which the buffer is allocated
+ * @param[in] size Size of the required buffer
+ */
+void *usb_pipe_alloc_buffer(usb_pipe_t *pipe, size_t size)
+{
+        // FIXME: Do not use the default policy, but the one required by HC.
+
+        dma_buffer_t buf;
+        if (dma_buffer_alloc(&buf, size))
+                return NULL;
+
+        return buf.virt;
+}
+
+void usb_pipe_free_buffer(usb_pipe_t *pipe, void *buffer)
+{
+        dma_buffer_t buf;
+        buf.virt = buffer;
+        dma_buffer_free(&buf);
+}
+
 /** Request a read (in) transfer on an endpoint pipe.
  *