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staging: comedi: ni_mio_common: clarify the cmd->start_arg validation and use

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Clarify the cmd->start_arg validation in Step 3 of the (*do_cmdtest)
functions.

For a TRIG_INT source, the cmd->start_arg is actually the valid
trig_num that is used by the async (*inttrig) callbacks.

Refactor the (*inttrig) functions so that the cmd->start_arg is used
to check the trig_num instead of the open coded values.

For aesthetics, refactor the (*do_cmd) functions to use if/else instead
of the switch to handle the cmd->start_src.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-04-17 10:08:11 -07:00 committed by Greg Kroah-Hartman
parent 7d8b7b4d92
commit ebb657babf
1 changed files with 42 additions and 32 deletions
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74
drivers/staging/comedi/drivers/ni_mio_common.c
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@ -2080,7 +2080,7 @@ static int ni_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
const struct ni_board_struct *board = comedi_board(dev);
struct ni_private *devpriv = dev->private;
int err = 0;
int tmp;
unsigned int tmp;
unsigned int sources;
/* Step 1 : check if triggers are trivially valid */
@ -2119,17 +2119,19 @@ static int ni_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
/* Step 3: check if arguments are trivially valid */
if (cmd->start_src == TRIG_EXT) {
/* external trigger */
unsigned int tmp = CR_CHAN(cmd->start_arg);
switch (cmd->start_src) {
case TRIG_NOW:
case TRIG_INT:
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
break;
case TRIG_EXT:
tmp = CR_CHAN(cmd->start_arg);
if (tmp > 16)
tmp = 16;
tmp |= (cmd->start_arg & (CR_INVERT | CR_EDGE));
err |= cfc_check_trigger_arg_is(&cmd->start_arg, tmp);
} else {
/* true for both TRIG_NOW and TRIG_INT */
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
break;
}
if (cmd->scan_begin_src == TRIG_TIMER) {
@ -2510,30 +2512,28 @@ static int ni_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
}
#endif
switch (cmd->start_src) {
case TRIG_NOW:
if (cmd->start_src == TRIG_NOW) {
/* AI_START1_Pulse */
devpriv->stc_writew(dev, AI_START1_Pulse | devpriv->ai_cmd2,
AI_Command_2_Register);
s->async->inttrig = NULL;
break;
case TRIG_EXT:
} else if (cmd->start_src == TRIG_EXT) {
s->async->inttrig = NULL;
break;
case TRIG_INT:
s->async->inttrig = &ni_ai_inttrig;
break;
} else { /* TRIG_INT */
s->async->inttrig = ni_ai_inttrig;
}
return 0;
}
static int ni_ai_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
unsigned int trignum)
static int ni_ai_inttrig(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int trig_num)
{
struct ni_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
if (trignum != 0)
if (trig_num != cmd->start_arg)
return -EINVAL;
devpriv->stc_writew(dev, AI_START1_Pulse | devpriv->ai_cmd2,
@ -2946,17 +2946,19 @@ static int ni_ao_insn_config(struct comedi_device *dev,
return -EINVAL;
}
static int ni_ao_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
unsigned int trignum)
static int ni_ao_inttrig(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int trig_num)
{
const struct ni_board_struct *board __maybe_unused = comedi_board(dev);
struct ni_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
int ret;
int interrupt_b_bits;
int i;
static const int timeout = 1000;
if (trignum != 0)
if (trig_num != cmd->start_arg)
return -EINVAL;
/* Null trig at beginning prevent ao start trigger from executing more than
@ -3217,7 +3219,7 @@ static int ni_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
AO_BC_TC_Interrupt_Enable, 1);
}
s->async->inttrig = &ni_ao_inttrig;
s->async->inttrig = ni_ao_inttrig;
return 0;
}
@ -3228,7 +3230,7 @@ static int ni_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
const struct ni_board_struct *board = comedi_board(dev);
struct ni_private *devpriv = dev->private;
int err = 0;
int tmp;
unsigned int tmp;
/* Step 1 : check if triggers are trivially valid */
@ -3258,17 +3260,18 @@ static int ni_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
/* Step 3: check if arguments are trivially valid */
if (cmd->start_src == TRIG_EXT) {
/* external trigger */
unsigned int tmp = CR_CHAN(cmd->start_arg);
switch (cmd->start_src) {
case TRIG_INT:
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
break;
case TRIG_EXT:
tmp = CR_CHAN(cmd->start_arg);
if (tmp > 18)
tmp = 18;
tmp |= (cmd->start_arg & (CR_INVERT | CR_EDGE));
err |= cfc_check_trigger_arg_is(&cmd->start_arg, tmp);
} else {
/* true for both TRIG_NOW and TRIG_INT */
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
break;
}
if (cmd->scan_begin_src == TRIG_TIMER) {
@ -3537,21 +3540,28 @@ static int ni_cdio_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
retval = ni_request_cdo_mite_channel(dev);
if (retval < 0)
return retval;
s->async->inttrig = &ni_cdo_inttrig;
s->async->inttrig = ni_cdo_inttrig;
return 0;
}
static int ni_cdo_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
unsigned int trignum)
static int ni_cdo_inttrig(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int trig_num)
{
#ifdef PCIDMA
struct ni_private *devpriv = dev->private;
unsigned long flags;
#endif
struct comedi_cmd *cmd = &s->async->cmd;
int retval = 0;
unsigned i;
const unsigned timeout = 1000;
if (trig_num != cmd->start_arg)
return -EINVAL;
s->async->inttrig = NULL;
/* read alloc the entire buffer */