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/*
* comedi/drivers/amplc_pc236_common.c
* Common support code for "amplc_pc236" and "amplc_pci236".
*
* Copyright (C) 2002-2014 MEV Ltd. <http://www.mev.co.uk/>
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include "../comedidev.h"
#include "amplc_pc236.h"
#include "8255.h"
static void pc236_intr_update(struct comedi_device *dev, bool enable)
{
const struct pc236_board *thisboard = dev->board_ptr;
struct pc236_private *devpriv = dev->private;
unsigned long flags;
spin_lock_irqsave(&dev->spinlock, flags);
devpriv->enable_irq = enable;
if (thisboard->intr_update_cb)
thisboard->intr_update_cb(dev, enable);
spin_unlock_irqrestore(&dev->spinlock, flags);
}
/*
* This function is called when an interrupt occurs to check whether
* the interrupt has been marked as enabled and was generated by the
* board. If so, the function prepares the hardware for the next
* interrupt.
* Returns false if the interrupt should be ignored.
*/
static bool pc236_intr_check(struct comedi_device *dev)
{
const struct pc236_board *thisboard = dev->board_ptr;
struct pc236_private *devpriv = dev->private;
bool retval = false;
unsigned long flags;
spin_lock_irqsave(&dev->spinlock, flags);
if (devpriv->enable_irq) {
if (thisboard->intr_chk_clr_cb)
retval = thisboard->intr_chk_clr_cb(dev);
else
retval = true;
}
spin_unlock_irqrestore(&dev->spinlock, flags);
return retval;
}
static int pc236_intr_insn(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_insn *insn,
unsigned int *data)
{
data[1] = 0;
return insn->n;
}
static int pc236_intr_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
int err = 0;
/* Step 1 : check if triggers are trivially valid */
err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_NONE);
if (err)
return 1;
/* Step 2a : make sure trigger sources are unique */
/* Step 2b : and mutually compatible */
/* Step 3: check it 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);
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
cmd->chanlist_len);
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* Step 4: fix up any arguments */
/* Step 5: check channel list if it exists */
return 0;
}
static int pc236_intr_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
pc236_intr_update(dev, true);
return 0;
}
static int pc236_intr_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
pc236_intr_update(dev, false);
return 0;
}
static irqreturn_t pc236_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct comedi_subdevice *s = dev->read_subdev;
bool handled;
handled = pc236_intr_check(dev);
if (dev->attached && handled) {
comedi_buf_write_samples(s, &s->state, 1);
comedi_handle_events(dev, s);
}
return IRQ_RETVAL(handled);
}
int amplc_pc236_common_attach(struct comedi_device *dev, unsigned long iobase,
unsigned int irq, unsigned long req_irq_flags)
{
struct comedi_subdevice *s;
int ret;
dev->iobase = iobase;
ret = comedi_alloc_subdevices(dev, 2);
if (ret)
return ret;
s = &dev->subdevices[0];
/* digital i/o subdevice (8255) */
ret = subdev_8255_init(dev, s, NULL, 0x00);
if (ret)
return ret;
s = &dev->subdevices[1];
dev->read_subdev = s;
s->type = COMEDI_SUBD_UNUSED;
pc236_intr_update(dev, false);
if (irq) {
if (request_irq(irq, pc236_interrupt, req_irq_flags,
dev->board_name, dev) >= 0) {
dev->irq = irq;
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
s->n_chan = 1;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = pc236_intr_insn;
s->len_chanlist = 1;
s->do_cmdtest = pc236_intr_cmdtest;
s->do_cmd = pc236_intr_cmd;
s->cancel = pc236_intr_cancel;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(amplc_pc236_common_attach);
static int __init amplc_pc236_common_init(void)
{
return 0;
}
module_init(amplc_pc236_common_init);
static void __exit amplc_pc236_common_exit(void)
{
}
module_exit(amplc_pc236_common_exit);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi helper for amplc_pc236 and amplc_pci236");
MODULE_LICENSE("GPL");
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