There is only one member in the subdevice private data, an unsigned value
that is the 'base_port' that the subdevice uses to access the port registers.
Just cast the appropriate value into s->private instead of allocating the
private data for each subdevice. The casts are a bit of a nusance but it
removes the unnecessary allocations.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gr...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_65xx.c | 39 ++++++++++++--------------------
1 file changed, 14 insertions(+), 25 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_65xx.c
b/drivers/staging/comedi/drivers/ni_65xx.c
index 4b3f504..7e562f1 100644
--- a/drivers/staging/comedi/drivers/ni_65xx.c
+++ b/drivers/staging/comedi/drivers/ni_65xx.c
@@ -274,25 +274,16 @@ struct ni_65xx_private {
unsigned short output_bits[NI_65XX_MAX_NUM_PORTS];
};
-struct ni_65xx_subdevice_private {
- unsigned base_port;
-};
-
-static inline struct ni_65xx_subdevice_private *sprivate(struct
comedi_subdevice
- *subdev)
-{
- return subdev->private;
-}
-
static int ni_65xx_dio_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct ni_65xx_private *devpriv = dev->private;
+ unsigned long base_port = (unsigned long)s->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int chan_mask = 1 << (chan % ni_65xx_channels_per_port);
- unsigned port = sprivate(s)->base_port + ni_65xx_port_by_channel(chan);
+ unsigned port = base_port + ni_65xx_port_by_channel(chan);
unsigned int interval;
unsigned int val;
@@ -357,6 +348,7 @@ static int ni_65xx_dio_insn_bits(struct comedi_device *dev,
struct comedi_insn *insn, unsigned int *data)
{
const struct ni_65xx_board *board = comedi_board(dev);
+ unsigned long base_port = (unsigned long)s->private;
struct ni_65xx_private *devpriv = dev->private;
int base_bitfield_channel;
unsigned read_bits = 0;
@@ -366,7 +358,7 @@ static int ni_65xx_dio_insn_bits(struct comedi_device *dev,
base_bitfield_channel = CR_CHAN(insn->chanspec);
for (port_offset = ni_65xx_port_by_channel(base_bitfield_channel);
port_offset <= last_port_offset; port_offset++) {
- unsigned port = sprivate(s)->base_port + port_offset;
+ unsigned port = base_port + port_offset;
int base_port_channel = port_offset * ni_65xx_channels_per_port;
unsigned port_mask, port_data, port_read_bits;
int bitshift = base_port_channel - base_bitfield_channel;
@@ -563,7 +555,6 @@ static int ni_65xx_auto_attach(struct comedi_device *dev,
struct pci_dev *pcidev = comedi_to_pci_dev(dev);
const struct ni_65xx_board *board = NULL;
struct ni_65xx_private *devpriv;
- struct ni_65xx_subdevice_private *spriv;
struct comedi_subdevice *s;
unsigned i;
int ret;
@@ -609,10 +600,9 @@ static int ni_65xx_auto_attach(struct comedi_device *dev,
s->maxdata = 1;
s->insn_config = ni_65xx_dio_insn_config;
s->insn_bits = ni_65xx_dio_insn_bits;
- spriv = comedi_alloc_spriv(s, sizeof(*spriv));
- if (!spriv)
- return -ENOMEM;
- spriv->base_port = 0;
+
+ /* the input ports always start at port 0 */
+ s->private = (void *)0;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
@@ -626,10 +616,9 @@ static int ni_65xx_auto_attach(struct comedi_device *dev,
s->range_table = &range_digital;
s->maxdata = 1;
s->insn_bits = ni_65xx_dio_insn_bits;
- spriv = comedi_alloc_spriv(s, sizeof(*spriv));
- if (!spriv)
- return -ENOMEM;
- spriv->base_port = board->num_di_ports;
+
+ /* the output ports always start after the input ports */
+ s->private = (void *)(unsigned long)board->num_di_ports;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
@@ -644,10 +633,10 @@ static int ni_65xx_auto_attach(struct comedi_device *dev,
s->maxdata = 1;
s->insn_config = ni_65xx_dio_insn_config;
s->insn_bits = ni_65xx_dio_insn_bits;
- spriv = comedi_alloc_spriv(s, sizeof(*spriv));
- if (!spriv)
- return -ENOMEM;
- spriv->base_port = 0;
+
+ /* the input/output ports always start at port 0 */
+ s->private = (void *)0;
+
/* configure all ports for input */
for (i = 0; i < board->num_dio_ports; ++i) {
writeb(NI_65XX_IO_SEL_INPUT,
--
1.9.3
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