staging: comedi: das1800: sample types are unsigned

Sample values in comedi are generally represented by unsigned values.
Change the type of the `ao_update_bits` member of `struct
das1800_private` and the types of various local variables used to hold
sample values from `short` to `unsigned short` for consistency.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c
index f753a10..1880038 100644 (file)
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -438,7 +438,8 @@ struct das1800_private {
        uint16_t *dma_current_buf;      /* pointer to dma buffer currently being used */
        unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
        unsigned long iobase2;  /* secondary io address used for analog out on 'ao' boards */
-       short ao_update_bits;   /* remembers the last write to the 'update' dac */
+       unsigned short ao_update_bits;  /* remembers the last write to the
+                                        * 'update' dac */
 };
 
 /* analog out range for 'ao' boards */
@@ -501,7 +502,7 @@ static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
                                          struct comedi_subdevice *s)
 {
        struct das1800_private *devpriv = dev->private;
-       short dpnt;
+       unsigned short dpnt;
        int unipolar;
        struct comedi_cmd *cmd = &s->async->cmd;
 
@@ -1211,7 +1212,7 @@ static int das1800_ai_rinsn(struct comedi_device *dev,
        int i, n;
        int chan, range, aref, chan_range;
        int timeout = 1000;
-       short dpnt;
+       unsigned short dpnt;
        int conv_flags = 0;
        unsigned long irq_flags;
 
@@ -1276,7 +1277,7 @@ static int das1800_ao_winsn(struct comedi_device *dev,
        int chan = CR_CHAN(insn->chanspec);
 /* int range = CR_RANGE(insn->chanspec); */
        int update_chan = thisboard->ao_n_chan - 1;
-       short output;
+       unsigned short output;
        unsigned long irq_flags;
 
        /*   card expects two's complement data */