diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/cb_pcidio.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/cb_pcidio.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/cb_pcidio.c b/drivers/staging/comedi/drivers/cb_pcidio.c new file mode 100644 index 000000000000..71a4b1482e36 --- /dev/null +++ b/drivers/staging/comedi/drivers/cb_pcidio.c @@ -0,0 +1,294 @@ +/* + comedi/drivers/cb_pcidio.c + A Comedi driver for PCI-DIO24H & PCI-DIO48H of ComputerBoards (currently MeasurementComputing) + + 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. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ +/* +Driver: cb_pcidio +Description: ComputerBoards' DIO boards with PCI interface +Devices: [Measurement Computing] PCI-DIO24 (cb_pcidio), PCI-DIO24H, PCI-DIO48H +Author: Yoshiya Matsuzaka +Updated: Mon, 29 Oct 2007 15:40:47 +0000 +Status: experimental + +This driver has been modified from skel.c of comedi-0.7.70. + +Configuration Options: + [0] - PCI bus of device (optional) + [1] - PCI slot of device (optional) + If bus/slot is not specified, the first available PCI device will + be used. + +Passing a zero for an option is the same as leaving it unspecified. +*/ + +/*------------------------------ HEADER FILES ---------------------------------*/ +#include "../comedidev.h" +#include "comedi_pci.h" +#include "8255.h" + +/*-------------------------- MACROS and DATATYPES -----------------------------*/ +#define PCI_VENDOR_ID_CB 0x1307 + +/* + * Board descriptions for two imaginary boards. Describing the + * boards in this way is optional, and completely driver-dependent. + * Some drivers use arrays such as this, other do not. + */ +struct pcidio_board { + const char *name; // anme of the board + int n_8255; // number of 8255 chips on board + + // indices of base address regions + int pcicontroler_badrindex; + int dioregs_badrindex; +}; + +static const struct pcidio_board pcidio_boards[] = { + { + name: "pci-dio24", + n_8255: 1, + pcicontroler_badrindex:1, + dioregs_badrindex:2, + }, + { + name: "pci-dio24h", + n_8255: 1, + pcicontroler_badrindex:1, + dioregs_badrindex:2, + }, + { + name: "pci-dio48h", + n_8255: 2, + pcicontroler_badrindex:0, + dioregs_badrindex:1, + }, +}; + +/* This is used by modprobe to translate PCI IDs to drivers. Should + * only be used for PCI and ISA-PnP devices */ +/* Please add your PCI vendor ID to comedidev.h, and it will be forwarded + * upstream. */ +static DEFINE_PCI_DEVICE_TABLE(pcidio_pci_table) = { + {PCI_VENDOR_ID_CB, 0x0028, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, + {PCI_VENDOR_ID_CB, 0x0014, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, + {PCI_VENDOR_ID_CB, 0x000b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, + {0} +}; + +MODULE_DEVICE_TABLE(pci, pcidio_pci_table); + +/* + * Useful for shorthand access to the particular board structure + */ +#define thisboard ((const struct pcidio_board *)dev->board_ptr) + +/* this structure is for data unique to this hardware driver. If + several hardware drivers keep similar information in this structure, + feel free to suggest moving the variable to the struct comedi_device struct. */ +struct pcidio_private { + int data; // curently unused + + /* would be useful for a PCI device */ + struct pci_dev *pci_dev; + + /* used for DO readback, curently unused */ + unsigned int do_readback[4]; /* up to 4 unsigned int suffice to hold 96 bits for PCI-DIO96 */ + + unsigned long dio_reg_base; // address of port A of the first 8255 chip on board +}; + +/* + * most drivers define the following macro to make it easy to + * access the private structure. + */ +#define devpriv ((struct pcidio_private *)dev->private) + +/* + * The struct comedi_driver structure tells the Comedi core module + * which functions to call to configure/deconfigure (attach/detach) + * the board, and also about the kernel module that contains + * the device code. + */ +static int pcidio_attach(struct comedi_device * dev, struct comedi_devconfig * it); +static int pcidio_detach(struct comedi_device * dev); +static struct comedi_driver driver_cb_pcidio = { + driver_name:"cb_pcidio", + module:THIS_MODULE, + attach:pcidio_attach, + detach:pcidio_detach, +/* It is not necessary to implement the following members if you are + * writing a driver for a ISA PnP or PCI card */ + /* Most drivers will support multiple types of boards by + * having an array of board structures. These were defined + * in pcidio_boards[] above. Note that the element 'name' + * was first in the structure -- Comedi uses this fact to + * extract the name of the board without knowing any details + * about the structure except for its length. + * When a device is attached (by comedi_config), the name + * of the device is given to Comedi, and Comedi tries to + * match it by going through the list of board names. If + * there is a match, the address of the pointer is put + * into dev->board_ptr and driver->attach() is called. + * + * Note that these are not necessary if you can determine + * the type of board in software. ISA PnP, PCI, and PCMCIA + * devices are such boards. + */ +// The following fields should NOT be initialized if you are dealing with PCI devices +// board_name: pcidio_boards, +// offset: sizeof(struct pcidio_board), +// num_names: sizeof(pcidio_boards) / sizeof(struct pcidio_board), +}; + +/*------------------------------- FUNCTIONS -----------------------------------*/ + +/* + * Attach is called by the Comedi core to configure the driver + * for a particular board. If you specified a board_name array + * in the driver structure, dev->board_ptr contains that + * address. + */ +static int pcidio_attach(struct comedi_device * dev, struct comedi_devconfig * it) +{ + struct pci_dev *pcidev = NULL; + int index; + int i; + + printk("comedi%d: cb_pcidio: \n", dev->minor); + +/* + * Allocate the private structure area. alloc_private() is a + * convenient macro defined in comedidev.h. + */ + if (alloc_private(dev, sizeof(struct pcidio_private)) < 0) + return -ENOMEM; +/* + * If you can probe the device to determine what device in a series + * it is, this is the place to do it. Otherwise, dev->board_ptr + * should already be initialized. + */ +/* + * Probe the device to determine what device in the series it is. + */ + + for (pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); + pcidev != NULL; + pcidev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pcidev)) { + // is it not a computer boards card? + if (pcidev->vendor != PCI_VENDOR_ID_CB) + continue; + // loop through cards supported by this driver + for (index = 0; + index < sizeof pcidio_boards / sizeof(struct pcidio_board); + index++) { + if (pcidio_pci_table[index].device != pcidev->device) + continue; + + // was a particular bus/slot requested? + if (it->options[0] || it->options[1]) { + // are we on the wrong bus/slot? + if (pcidev->bus->number != it->options[0] || + PCI_SLOT(pcidev->devfn) != + it->options[1]) { + continue; + } + } + dev->board_ptr = pcidio_boards + index; + goto found; + } + } + + printk("No supported ComputerBoards/MeasurementComputing card found on " + "requested position\n"); + return -EIO; + + found: + +/* + * Initialize dev->board_name. Note that we can use the "thisboard" + * macro now, since we just initialized it in the last line. + */ + dev->board_name = thisboard->name; + + devpriv->pci_dev = pcidev; + printk("Found %s on bus %i, slot %i\n", thisboard->name, + devpriv->pci_dev->bus->number, + PCI_SLOT(devpriv->pci_dev->devfn)); + if (comedi_pci_enable(pcidev, thisboard->name)) { + printk("cb_pcidio: failed to enable PCI device and request regions\n"); + return -EIO; + } + devpriv->dio_reg_base + = + pci_resource_start(devpriv->pci_dev, + pcidio_boards[index].dioregs_badrindex); + +/* + * Allocate the subdevice structures. alloc_subdevice() is a + * convenient macro defined in comedidev.h. + */ + if (alloc_subdevices(dev, thisboard->n_8255) < 0) + return -ENOMEM; + + for (i = 0; i < thisboard->n_8255; i++) { + subdev_8255_init(dev, dev->subdevices + i, + NULL, devpriv->dio_reg_base + i * 4); + printk(" subdev %d: base = 0x%lx\n", i, + devpriv->dio_reg_base + i * 4); + } + + printk("attached\n"); + return 1; +} + +/* + * _detach is called to deconfigure a device. It should deallocate + * resources. + * This function is also called when _attach() fails, so it should be + * careful not to release resources that were not necessarily + * allocated by _attach(). dev->private and dev->subdevices are + * deallocated automatically by the core. + */ +static int pcidio_detach(struct comedi_device * dev) +{ + printk("comedi%d: cb_pcidio: remove\n", dev->minor); + if (devpriv) { + if (devpriv->pci_dev) { + if (devpriv->dio_reg_base) { + comedi_pci_disable(devpriv->pci_dev); + } + pci_dev_put(devpriv->pci_dev); + } + } + if (dev->subdevices) { + int i; + for (i = 0; i < thisboard->n_8255; i++) { + subdev_8255_cleanup(dev, dev->subdevices + i); + } + } + return 0; +} + +/* + * A convenient macro that defines init_module() and cleanup_module(), + * as necessary. + */ +COMEDI_PCI_INITCLEANUP(driver_cb_pcidio, pcidio_pci_table); |