added comedi_buf_put_array()

writes array to buffer

diff --git a/include/linux/comedidev.h b/include/linux/comedidev.h
index 15266e1c0fe0aa5046d3974b4db8b523a4d9c2b7..cf73eccdd965ca9080bb5bb79c51d24d52a4f37b 100644 (file)
--- a/include/linux/comedidev.h
+++ b/include/linux/comedidev.h
@@ -307,7 +307,6 @@ static inline int alloc_private(comedi_device *dev,int size)
 // writes a data point to comedi's buffer, used for input
 static inline void comedi_buf_put(comedi_async *async, sampl_t x)
 {
-
        *(sampl_t *)(async->data + async->buf_int_ptr) = x;
        async->buf_int_ptr += sizeof(sampl_t);
        if(async->buf_int_ptr >= async->data_len){
@@ -321,6 +320,37 @@ static inline void comedi_buf_put(comedi_async *async, sampl_t x)
        async->buf_int_count += sizeof(sampl_t);
 }
 
+/* Writes an array of data points to comedi's buffer, used for input.
+ * Can be more efficient than comedi_buf_put() */
+static inline void comedi_buf_put_array(comedi_async *async, sampl_t* array, unsigned int length)
+{
+       unsigned int num_bytes;
+       unsigned int xfer_count = 0;
+
+       while((num_bytes = length * sizeof(sampl_t) - xfer_count))
+       {
+               if( async->buf_int_ptr + num_bytes > async->data_len)
+                       num_bytes = async->data_len - async->buf_int_ptr;
+
+               memcpy(async->data + async->buf_int_ptr + xfer_count, array, num_bytes);
+
+               async->buf_int_ptr += num_bytes;
+               if(async->buf_int_ptr >= async->data_len)
+               {
+                       async->buf_int_ptr %= async->data_len;
+                       async->events |= COMEDI_CB_EOBUF;
+               }
+               async->cur_chan += num_bytes / sizeof(sampl_t);
+               if(async->cur_chan >= async->cmd.chanlist_len)
+               {
+                       async->cur_chan %= async->cmd.chanlist_len;
+                       async->events |= COMEDI_CB_EOS;
+               }
+               async->buf_int_count += num_bytes;
+               xfer_count += num_bytes;
+       }
+}
+
 /* Reads a data point from comedi's buffer, used for output.
  * returns negative value on error. */
 static inline int comedi_buf_get(comedi_async *async, sampl_t *x)