staging: comedi: ni_tiocmd: pass subdevice to command setup functions

The `ni_tio_input_cmd()`, `ni_tio_output_cmd()` and `ni_tio_cmd_setup()`
functions are called from `ni_tio_cmd()` to set up a comedi command.
They currently get passed two parameters, a pointer to a `struct
ni_gpct` and a pointer to a `struct comedi_async`, but both of those
come from members of a `struct comedi_subdevice` (the former from the
`private` member).  Replace the parameters with a pointer to the `struct
comedi_subdevice`.

The main motive is to make the comedi subdevice more easily available to
the functions for the use of subsequent patches to remove the `struct
comedi_async *` parameters from the comedi buffer handling functions.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/ni_tiocmd.c b/drivers/staging/comedi/drivers/ni_tiocmd.c
index b9d23db..7a163fc 100644 (file)
--- a/drivers/staging/comedi/drivers/ni_tiocmd.c
+++ b/drivers/staging/comedi/drivers/ni_tiocmd.c
@@ -115,10 +115,12 @@ static int ni_tio_input_inttrig(struct comedi_device *dev,
        return retval;
 }
 
-static int ni_tio_input_cmd(struct ni_gpct *counter, struct comedi_async *async)
+static int ni_tio_input_cmd(struct comedi_subdevice *s)
 {
+       struct ni_gpct *counter = s->private;
        struct ni_gpct_device *counter_dev = counter->counter_dev;
        unsigned cidx = counter->counter_index;
+       struct comedi_async *async = s->async;
        struct comedi_cmd *cmd = &async->cmd;
        int retval = 0;
 
@@ -164,9 +166,10 @@ static int ni_tio_input_cmd(struct ni_gpct *counter, struct comedi_async *async)
        return retval;
 }
 
-static int ni_tio_output_cmd(struct ni_gpct *counter,
-                            struct comedi_async *async)
+static int ni_tio_output_cmd(struct comedi_subdevice *s)
 {
+       struct ni_gpct *counter = s->private;
+
        dev_err(counter->counter_dev->dev->class_dev,
                "output commands not yet implemented.\n");
        return -ENOTSUPP;
@@ -178,9 +181,10 @@ static int ni_tio_output_cmd(struct ni_gpct *counter,
        return ni_tio_arm(counter, 1, NI_GPCT_ARM_IMMEDIATE);
 }
 
-static int ni_tio_cmd_setup(struct ni_gpct *counter, struct comedi_async *async)
+static int ni_tio_cmd_setup(struct comedi_subdevice *s)
 {
-       struct comedi_cmd *cmd = &async->cmd;
+       struct comedi_cmd *cmd = &s->async->cmd;
+       struct ni_gpct *counter = s->private;
        unsigned cidx = counter->counter_index;
        int set_gate_source = 0;
        unsigned gate_source;
@@ -219,12 +223,12 @@ int ni_tio_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
                        "Interrupt-driven commands not yet implemented.\n");
                retval = -EIO;
        } else {
-               retval = ni_tio_cmd_setup(counter, async);
+               retval = ni_tio_cmd_setup(s);
                if (retval == 0) {
                        if (cmd->flags & CMDF_WRITE)
-                               retval = ni_tio_output_cmd(counter, async);
+                               retval = ni_tio_output_cmd(s);
                        else
-                               retval = ni_tio_input_cmd(counter, async);
+                               retval = ni_tio_input_cmd(s);
                }
        }
        spin_unlock_irqrestore(&counter->lock, flags);