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staging: comedi: adv_pci_dio: Support falling edge triggers

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The interrupt support for Advantech PCI-1730 currrently supports only
rising edge inputs for the trigger sources.  Each of four interrupt
sources (each with its own Comedi subdevice) can be set to trigger on
either a rising edge or a falling edge.  Add support for choosing the
edge during set-up of the asynchronous command for the subdevice, using
the `CR_INVERT` bit of `scan_begin_arg` to indicate falling edge when
set, or rising edge when clear.  Also allow the `CR_EDGE` bit to be set,
but ignore it.  All other bits of `scan_begin_arg` must be zero.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20210118144359.378730-3-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2021-01-18 14:43:59 +00:00 committed by Greg Kroah-Hartman
parent 2e0e629d0f
commit b4783da2c1
1 changed files with 18 additions and 2 deletions
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20
drivers/staging/comedi/drivers/adv_pci_dio.c
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@ -227,6 +227,7 @@ struct pci_dio_dev_private_data {
int boardtype;
int irq_subd;
unsigned short int_ctrl;
unsigned short int_rf;
};
struct pci_dio_sd_private_data {
@ -313,7 +314,15 @@ static int pci_dio_asy_cmdtest(struct comedi_device *dev,
/* Step 3: check if arguments are trivially valid */
err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
/*
* For scan_begin_arg, the trigger number must be 0 and the only
* allowed flags are CR_EDGE and CR_INVERT. CR_EDGE is ignored,
* CR_INVERT sets the trigger to falling edge.
*/
if (cmd->scan_begin_arg & ~(CR_EDGE | CR_INVERT)) {
cmd->scan_begin_arg &= (CR_EDGE | CR_INVERT);
err |= -EINVAL;
}
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
cmd->chanlist_len);
@ -335,12 +344,18 @@ static int pci_dio_asy_cmd(struct comedi_device *dev,
struct pci_dio_dev_private_data *dev_private = dev->private;
struct pci_dio_sd_private_data *sd_priv = s->private;
const struct dio_boardtype *board = dev->board_ptr;
struct comedi_cmd *cmd = &s->async->cmd;
unsigned long cpu_flags;
unsigned short int_en;
int_en = board->sdirq[s->index - dev_private->irq_subd].int_en;
spin_lock_irqsave(&dev->spinlock, cpu_flags);
if (cmd->scan_begin_arg & CR_INVERT)
dev_private->int_rf |= int_en; /* falling edge */
else
dev_private->int_rf &= ~int_en; /* rising edge */
outb(dev_private->int_rf, dev->iobase + PCI173X_INT_RF_REG);
dev_private->int_ctrl |= int_en; /* enable interrupt source */
outb(dev_private->int_ctrl, dev->iobase + PCI173X_INT_EN_REG);
spin_unlock_irqrestore(&dev->spinlock, cpu_flags);
@ -483,7 +498,8 @@ static int pci_dio_reset(struct comedi_device *dev, unsigned long cardtype)
/* Reset all 4 Int Flags */
outb(0x0f, dev->iobase + PCI173X_INT_CLR_REG);
/* Rising Edge => IRQ . On all 4 Pins */
outb(0x00, dev->iobase + PCI173X_INT_RF_REG);
dev_private->int_rf = 0x00;
outb(dev_private->int_rf, dev->iobase + PCI173X_INT_RF_REG);
break;
case TYPE_PCI1739:
case TYPE_PCI1750: