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// SPDX-License-Identifier: GPL-2.0+
/*
* comedi/drivers/amplc_pci236.c
* Driver for Amplicon PCI236 DIO boards.
*
* 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>
*/
/*
* Driver: amplc_pci236
* Description: Amplicon PCI236
* Author: Ian Abbott <abbotti@mev.co.uk>
* Devices: [Amplicon] PCI236 (amplc_pci236)
* Updated: Fri, 25 Jul 2014 15:32:40 +0000
* Status: works
*
* Configuration options:
* none
*
* Manual configuration of PCI board (PCI236) is not supported; it is
* configured automatically.
*
* The PCI236 board has a single 8255 appearing as subdevice 0.
*
* Subdevice 1 pretends to be a digital input device, but it always
* returns 0 when read. However, if you run a command with
* scan_begin_src=TRIG_EXT, a rising edge on port C bit 3 acts as an
* external trigger, which can be used to wake up tasks. This is like
* the comedi_parport device. If no interrupt is connected, then
* subdevice 1 is unused.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include "../comedi_pci.h"
#include "amplc_pc236.h"
#include "plx9052.h"
/* Disable, and clear, interrupts */
#define PCI236_INTR_DISABLE (PLX9052_INTCSR_LI1POL | \
PLX9052_INTCSR_LI2POL | \
PLX9052_INTCSR_LI1SEL | \
PLX9052_INTCSR_LI1CLRINT)
/* Enable, and clear, interrupts */
#define PCI236_INTR_ENABLE (PLX9052_INTCSR_LI1ENAB | \
PLX9052_INTCSR_LI1POL | \
PLX9052_INTCSR_LI2POL | \
PLX9052_INTCSR_PCIENAB | \
PLX9052_INTCSR_LI1SEL | \
PLX9052_INTCSR_LI1CLRINT)
static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
{
struct pc236_private *devpriv = dev->private;
/* this will also clear the "local interrupt 1" latch */
outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
devpriv->lcr_iobase + PLX9052_INTCSR);
}
static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
{
struct pc236_private *devpriv = dev->private;
/* check if interrupt occurred */
if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
PLX9052_INTCSR_LI1STAT))
return false;
/* clear the interrupt */
pci236_intr_update_cb(dev, devpriv->enable_irq);
return true;
}
static const struct pc236_board pc236_pci_board = {
.name = "pci236",
.intr_update_cb = pci236_intr_update_cb,
.intr_chk_clr_cb = pci236_intr_chk_clr_cb,
};
static int pci236_auto_attach(struct comedi_device *dev,
unsigned long context_unused)
{
struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
struct pc236_private *devpriv;
unsigned long iobase;
int ret;
dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
pci_name(pci_dev));
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
dev->board_ptr = &pc236_pci_board;
dev->board_name = pc236_pci_board.name;
ret = comedi_pci_enable(dev);
if (ret)
return ret;
devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
iobase = pci_resource_start(pci_dev, 2);
return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
IRQF_SHARED);
}
static struct comedi_driver amplc_pci236_driver = {
.driver_name = "amplc_pci236",
.module = THIS_MODULE,
.auto_attach = pci236_auto_attach,
.detach = comedi_pci_detach,
};
static const struct pci_device_id pci236_pci_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, pci236_pci_table);
static int amplc_pci236_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
return comedi_pci_auto_config(dev, &lc_pci236_driver,
id->driver_data);
}
static struct pci_driver amplc_pci236_pci_driver = {
.name = "amplc_pci236",
.id_table = pci236_pci_table,
.probe = &lc_pci236_pci_probe,
.remove = comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
MODULE_LICENSE("GPL");
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