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Diffstat (limited to '')
| -rw-r--r-- | drivers/comedi/drivers/cb_pcimdda.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/cb_pcimdda.c b/drivers/comedi/drivers/cb_pcimdda.c new file mode 100644 index 000000000..bf8093a10 --- /dev/null +++ b/drivers/comedi/drivers/cb_pcimdda.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * comedi/drivers/cb_pcimdda.c + * Computer Boards PCIM-DDA06-16 Comedi driver + * Author: Calin Culianu <calin@ajvar.org> + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 2000 David A. Schleef <ds@schleef.org> + */ +/* + * Driver: cb_pcimdda + * Description: Measurement Computing PCIM-DDA06-16 + * Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda) + * Author: Calin Culianu <calin@ajvar.org> + * Updated: Mon, 14 Apr 2008 15:15:51 +0100 + * Status: works + * + * All features of the PCIM-DDA06-16 board are supported. + * This board has 6 16-bit AO channels, and the usual 8255 DIO setup. + * (24 channels, configurable in banks of 8 and 4, etc.). + * This board does not support commands. + * + * The board has a peculiar way of specifying AO gain/range settings -- You have + * 1 jumper bank on the card, which either makes all 6 AO channels either + * 5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar. + * + * Since there is absolutely _no_ way to tell in software how this jumper is set + * (well, at least according to the rather thin spec. from Measurement Computing + * that comes with the board), the driver assumes the jumper is at its factory + * default setting of +/-5V. + * + * Also of note is the fact that this board features another jumper, whose + * state is also completely invisible to software. It toggles two possible AO + * output modes on the board: + * + * - Update Mode: Writing to an AO channel instantaneously updates the actual + * signal output by the DAC on the board (this is the factory default). + * - Simultaneous XFER Mode: Writing to an AO channel has no effect until + * you read from any one of the AO channels. This is useful for loading + * all 6 AO values, and then reading from any one of the AO channels on the + * device to instantly update all 6 AO values in unison. Useful for some + * control apps, I would assume? If your jumper is in this setting, then you + * need to issue your comedi_data_write()s to load all the values you want, + * then issue one comedi_data_read() on any channel on the AO subdevice + * to initiate the simultaneous XFER. + * + * Configuration Options: not applicable, uses PCI auto config + */ + +/* + * This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output + * card. This board has a unique register layout and as such probably + * deserves its own driver file. + * + * It is theoretically possible to integrate this board into the cb_pcidda + * file, but since that isn't my code, I didn't want to significantly + * modify that file to support this board (I thought it impolite to do so). + * + * At any rate, if you feel ambitious, please feel free to take + * the code out of this file and combine it with a more unified driver + * file. + * + * I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil> + * for lending me a board so that I could write this driver. + * + * -Calin Culianu <calin@ajvar.org> + */ + +#include <linux/module.h> +#include <linux/comedi/comedi_pci.h> +#include <linux/comedi/comedi_8255.h> + +/* device ids of the cards we support -- currently only 1 card supported */ +#define PCI_ID_PCIM_DDA06_16 0x0053 + +/* + * Register map, 8-bit access only + */ +#define PCIMDDA_DA_CHAN(x) (0x00 + (x) * 2) +#define PCIMDDA_8255_BASE_REG 0x0c + +static int cb_pcimdda_ao_insn_write(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned long offset = dev->iobase + PCIMDDA_DA_CHAN(chan); + unsigned int val = s->readback[chan]; + int i; + + for (i = 0; i < insn->n; i++) { + val = data[i]; + + /* + * Write the LSB then MSB. + * + * If the simultaneous xfer mode is selected by the + * jumper on the card, a read instruction is needed + * in order to initiate the simultaneous transfer. + * Otherwise, the DAC will be updated when the MSB + * is written. + */ + outb(val & 0x00ff, offset); + outb((val >> 8) & 0x00ff, offset + 1); + } + s->readback[chan] = val; + + return insn->n; +} + +static int cb_pcimdda_ao_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned int chan = CR_CHAN(insn->chanspec); + + /* Initiate the simultaneous transfer */ + inw(dev->iobase + PCIMDDA_DA_CHAN(chan)); + + return comedi_readback_insn_read(dev, s, insn, data); +} + +static int cb_pcimdda_auto_attach(struct comedi_device *dev, + unsigned long context_unused) +{ + struct pci_dev *pcidev = comedi_to_pci_dev(dev); + struct comedi_subdevice *s; + int ret; + + ret = comedi_pci_enable(dev); + if (ret) + return ret; + dev->iobase = pci_resource_start(pcidev, 3); + + ret = comedi_alloc_subdevices(dev, 2); + if (ret) + return ret; + + s = &dev->subdevices[0]; + /* analog output subdevice */ + s->type = COMEDI_SUBD_AO; + s->subdev_flags = SDF_WRITABLE | SDF_READABLE; + s->n_chan = 6; + s->maxdata = 0xffff; + s->range_table = &range_bipolar5; + s->insn_write = cb_pcimdda_ao_insn_write; + s->insn_read = cb_pcimdda_ao_insn_read; + + ret = comedi_alloc_subdev_readback(s); + if (ret) + return ret; + + s = &dev->subdevices[1]; + /* digital i/o subdevice */ + return subdev_8255_init(dev, s, NULL, PCIMDDA_8255_BASE_REG); +} + +static struct comedi_driver cb_pcimdda_driver = { + .driver_name = "cb_pcimdda", + .module = THIS_MODULE, + .auto_attach = cb_pcimdda_auto_attach, + .detach = comedi_pci_detach, +}; + +static int cb_pcimdda_pci_probe(struct pci_dev *dev, + const struct pci_device_id *id) +{ + return comedi_pci_auto_config(dev, &cb_pcimdda_driver, + id->driver_data); +} + +static const struct pci_device_id cb_pcimdda_pci_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_ID_PCIM_DDA06_16) }, + { 0 } +}; +MODULE_DEVICE_TABLE(pci, cb_pcimdda_pci_table); + +static struct pci_driver cb_pcimdda_driver_pci_driver = { + .name = "cb_pcimdda", + .id_table = cb_pcimdda_pci_table, + .probe = cb_pcimdda_pci_probe, + .remove = comedi_pci_auto_unconfig, +}; +module_comedi_pci_driver(cb_pcimdda_driver, cb_pcimdda_driver_pci_driver); + +MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>"); +MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA series. Currently only supports PCIM-DDA06-16 (which also happens to be the only board in this series. :) ) "); +MODULE_LICENSE("GPL"); |