openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

staging: comedi: s526: remove struct s526GPCTConfig 

The enum in this struct is used by the driver to know how the
gpct channels have been configured. Instead of using the private
enum S526_GPCT_APP_CLASS, we can just use the INSN_CONFIG_* value
that was passed in data[0] to the s526_gpct_insn_config().

The data array in this struct in never used. It actually could
cause a BUG since it assumes that the data pointer passed to
s526_gpct_insn_config() always has 6 values but the comments
indicate that there are really only 4 or 5.

Remove the s526GPCTConfig struct and associated S526_GPCT_APP_CLASS
enum and just use and unsigned int array in the private data to
hold the gpct configuration.

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>
This commit is contained in:
H Hartley Sweeten 2012-09-19 15:12:54 -07:00 committed by Greg Kroah-Hartman
parent 5c813bb100
commit 675f98f101
1 changed files with 9 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/staging/comedi/drivers/s526.c
View File

@ -118,29 +118,9 @@ union cmReg {
unsigned short value;
};
#define MAX_GPCT_CONFIG_DATA 6
/* Different Application Classes for GPCT Subdevices */
/* The list is not exhaustive and needs discussion! */
enum S526_GPCT_APP_CLASS {
CountingAndTimeMeasurement,
SinglePulseGeneration,
PulseTrainGeneration,
PositionMeasurement,
Miscellaneous
};
/* Config struct for different GPCT subdevice Application Classes and
their options
*/
struct s526GPCTConfig {
enum S526_GPCT_APP_CLASS app;
int data[MAX_GPCT_CONFIG_DATA];
};
struct s526_private {
unsigned int ao_readback[2];
struct s526GPCTConfig s526_gpct_config[4];
unsigned int gpct_config[4];
unsigned short s526_ai_config;
};
@ -175,12 +155,8 @@ static int s526_gpct_insn_config(struct comedi_device *dev,
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned long chan_iobase = dev->iobase + chan * 8;
unsigned int val;
int i;
union cmReg cmReg;
for (i = 0; i < MAX_GPCT_CONFIG_DATA; i++)
devpriv->s526_gpct_config[chan].data[i] = data[i];
/* Check what type of Counter the user requested, data[0] contains */
/* the Application type */
switch (data[0]) {
@ -191,7 +167,7 @@ static int s526_gpct_insn_config(struct comedi_device *dev,
data[2]: Pre-load Register Value
data[3]: Conter Control Register
*/
devpriv->s526_gpct_config[chan].app = PositionMeasurement;
devpriv->gpct_config[chan] = data[0];
#if 0
/* Example of Counter Application */
@ -294,7 +270,7 @@ static int s526_gpct_insn_config(struct comedi_device *dev,
data[3]: Pre-load Register 1 Value
data[4]: Conter Control Register
*/
devpriv->s526_gpct_config[chan].app = SinglePulseGeneration;
devpriv->gpct_config[chan] = data[0];
/* Set Counter Mode Register */
cmReg.value = data[1] & 0xffff;
@ -337,7 +313,7 @@ static int s526_gpct_insn_config(struct comedi_device *dev,
data[3]: Pre-load Register 1 Value
data[4]: Conter Control Register
*/
devpriv->s526_gpct_config[chan].app = PulseTrainGeneration;
devpriv->gpct_config[chan] = data[0];
/* Set Counter Mode Register */
cmReg.value = data[1] & 0xffff;
@ -392,25 +368,21 @@ static int s526_gpct_winsn(struct comedi_device *dev,
inw(chan_iobase + REG_C0M); /* Is this read required? */
/* Check what Application of Counter this channel is configured for */
switch (devpriv->s526_gpct_config[chan].app) {
case PulseTrainGeneration:
switch (devpriv->gpct_config[chan]) {
case INSN_CONFIG_GPCT_PULSE_TRAIN_GENERATOR:
/* data[0] contains the PULSE_WIDTH
data[1] contains the PULSE_PERIOD
@pre PULSE_PERIOD > PULSE_WIDTH > 0
The above periods must be expressed as a multiple of the
pulse frequency on the selected source
*/
if ((data[1] > data[0]) && (data[0] > 0)) {
devpriv->s526_gpct_config[chan].data[0] = data[0];
devpriv->s526_gpct_config[chan].data[1] = data[1];
} else {
if ((data[1] < data[0]) || !data[0])
return -EINVAL;
}
/* Fall thru to write the PULSE_WIDTH */
case PositionMeasurement:
case SinglePulseGeneration:
case INSN_CONFIG_GPCT_QUADRATURE_ENCODER:
case INSN_CONFIG_GPCT_SINGLE_PULSE_GENERATOR:
outw((data[0] >> 16) & 0xffff, chan_iobase + REG_C0H);
outw(data[0] & 0xffff, chan_iobase + REG_C0L);
break;