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145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi/drivers/amplc_pci236.c
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* Driver for Amplicon PCI236 DIO boards.
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*
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* Copyright (C) 2002-2014 MEV Ltd. <https://www.mev.co.uk/>
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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*/
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/*
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* Driver: amplc_pci236
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* Description: Amplicon PCI236
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* Author: Ian Abbott <abbotti@mev.co.uk>
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* Devices: [Amplicon] PCI236 (amplc_pci236)
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* Updated: Fri, 25 Jul 2014 15:32:40 +0000
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* Status: works
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*
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* Configuration options:
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* none
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*
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* Manual configuration of PCI board (PCI236) is not supported; it is
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* configured automatically.
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*
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* The PCI236 board has a single 8255 appearing as subdevice 0.
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*
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* Subdevice 1 pretends to be a digital input device, but it always
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* returns 0 when read. However, if you run a command with
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* scan_begin_src=TRIG_EXT, a rising edge on port C bit 3 acts as an
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* external trigger, which can be used to wake up tasks. This is like
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* the comedi_parport device. If no interrupt is connected, then
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* subdevice 1 is unused.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include "../comedi_pci.h"
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#include "amplc_pc236.h"
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#include "plx9052.h"
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/* Disable, and clear, interrupts */
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#define PCI236_INTR_DISABLE (PLX9052_INTCSR_LI1POL | \
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PLX9052_INTCSR_LI2POL | \
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PLX9052_INTCSR_LI1SEL | \
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PLX9052_INTCSR_LI1CLRINT)
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/* Enable, and clear, interrupts */
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#define PCI236_INTR_ENABLE (PLX9052_INTCSR_LI1ENAB | \
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PLX9052_INTCSR_LI1POL | \
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PLX9052_INTCSR_LI2POL | \
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PLX9052_INTCSR_PCIENAB | \
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PLX9052_INTCSR_LI1SEL | \
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PLX9052_INTCSR_LI1CLRINT)
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static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
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{
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struct pc236_private *devpriv = dev->private;
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/* this will also clear the "local interrupt 1" latch */
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outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
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devpriv->lcr_iobase + PLX9052_INTCSR);
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}
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static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
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{
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struct pc236_private *devpriv = dev->private;
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/* check if interrupt occurred */
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if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
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PLX9052_INTCSR_LI1STAT))
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return false;
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/* clear the interrupt */
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pci236_intr_update_cb(dev, devpriv->enable_irq);
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return true;
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}
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static const struct pc236_board pc236_pci_board = {
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.name = "pci236",
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.intr_update_cb = pci236_intr_update_cb,
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.intr_chk_clr_cb = pci236_intr_chk_clr_cb,
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};
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static int pci236_auto_attach(struct comedi_device *dev,
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unsigned long context_unused)
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{
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struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
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struct pc236_private *devpriv;
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unsigned long iobase;
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int ret;
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dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
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pci_name(pci_dev));
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devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
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if (!devpriv)
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return -ENOMEM;
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dev->board_ptr = &pc236_pci_board;
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dev->board_name = pc236_pci_board.name;
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ret = comedi_pci_enable(dev);
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if (ret)
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return ret;
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devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
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iobase = pci_resource_start(pci_dev, 2);
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return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
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IRQF_SHARED);
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}
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static struct comedi_driver amplc_pci236_driver = {
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.driver_name = "amplc_pci236",
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.module = THIS_MODULE,
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.auto_attach = pci236_auto_attach,
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.detach = comedi_pci_detach,
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};
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static const struct pci_device_id pci236_pci_table[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(pci, pci236_pci_table);
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static int amplc_pci236_pci_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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return comedi_pci_auto_config(dev, &lc_pci236_driver,
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id->driver_data);
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}
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static struct pci_driver amplc_pci236_pci_driver = {
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.name = "amplc_pci236",
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.id_table = pci236_pci_table,
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.probe = &lc_pci236_pci_probe,
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.remove = comedi_pci_auto_unconfig,
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};
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module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
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MODULE_AUTHOR("Comedi https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
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MODULE_LICENSE("GPL");
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