diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/amplc_pci236.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/amplc_pci236.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/amplc_pci236.c b/drivers/staging/comedi/drivers/amplc_pci236.c new file mode 100644 index 000000000000..436aebaf7621 --- /dev/null +++ b/drivers/staging/comedi/drivers/amplc_pci236.c @@ -0,0 +1,161 @@ +/* + * 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> + * + * 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. + */ +/* + * 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/pci.h> +#include <linux/interrupt.h> + +#include "../comedidev.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 void pci236_detach(struct comedi_device *dev) +{ + if (dev->irq) + free_irq(dev->irq, dev); + comedi_pci_disable(dev); +} + +static struct comedi_driver amplc_pci236_driver = { + .driver_name = "amplc_pci236", + .module = THIS_MODULE, + .auto_attach = pci236_auto_attach, + .detach = pci236_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"); |