staging: comedi: usbduxsigma: tidy up usbduxsigma_pwm_config()

Rename the function so it has namespace associated with the driver.
Rename the local variable used for the private data pointer.

Remove some unnecessary comments and tidy up the comment about the
parameters for the INSN_CONFIG_PWM_SET_H_BRIDGE instruction.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/usbduxsigma.c

@@ -1394,15 +1394,15 @@ static int usbdux_pwm_read(struct comedi_device *x1,
 	return -EINVAL;
 };
 
-/* switches on/off PWM */
-static int usbdux_pwm_config(struct comedi_device *dev,
-			     struct comedi_subdevice *s,
-			     struct comedi_insn *insn, unsigned int *data)
+static int usbduxsigma_pwm_config(struct comedi_device *dev,
+				  struct comedi_subdevice *s,
+				  struct comedi_insn *insn,
+				  unsigned int *data)
 {
-	struct usbduxsigma_private *this_usbduxsub = dev->private;
+	struct usbduxsigma_private *devpriv = dev->private;
+
 	switch (data[0]) {
 	case INSN_CONFIG_ARM:
-		/* switch it on */
 		/*
 		 * if not zero the PWM is limited to a certain time which is
 		 * not supported here
@@ -1413,27 +1413,20 @@ static int usbdux_pwm_config(struct comedi_device *dev,
 	case INSN_CONFIG_DISARM:
 		return usbdux_pwm_cancel(dev, s);
 	case INSN_CONFIG_GET_PWM_STATUS:
-		/*
-		 * to check if the USB transmission has failed or in case PWM
-		 * was limited to n cycles to check if it has terminated
-		 */
-		data[1] = this_usbduxsub->pwm_cmd_running;
+		data[1] = devpriv->pwm_cmd_running;
 		return 0;
 	case INSN_CONFIG_PWM_SET_PERIOD:
 		return usbdux_pwm_period(dev, s, data[1]);
 	case INSN_CONFIG_PWM_GET_PERIOD:
-		data[1] = this_usbduxsub->pwmPeriod;
+		data[1] = devpriv->pwmPeriod;
 		return 0;
 	case INSN_CONFIG_PWM_SET_H_BRIDGE:
-		/* value in the first byte and the sign in the second for a
-		   relay */
-		return usbdux_pwm_pattern(dev, s,
-					  /* the channel number */
-					  CR_CHAN(insn->chanspec),
-					  /* actual PWM data */
-					  data[1],
-					  /* just a sign */
-					  (data[2] != 0));
+		/*
+		 * data[1] = value
+		 * data[2] = sign (for a relay)
+		 */
+		return usbdux_pwm_pattern(dev, s, CR_CHAN(insn->chanspec),
+					  data[1], (data[2] != 0));
 	case INSN_CONFIG_PWM_GET_H_BRIDGE:
 		/* values are not kept in this driver, nothing to return */
 		return -EINVAL;
@@ -1560,7 +1553,7 @@ static int usbduxsigma_attach_common(struct comedi_device *dev)
 		s->maxdata	= devpriv->sizePwmBuf;
 		s->insn_write	= usbdux_pwm_write;
 		s->insn_read	= usbdux_pwm_read;
-		s->insn_config	= usbdux_pwm_config;
+		s->insn_config	= usbduxsigma_pwm_config;
 
 		usbdux_pwm_period(dev, s, PWM_DEFAULT_PERIOD);
 	}