// SPDX-License-Identifier: GPL-2.0+ /* * comedi/drivers/cb_pcimdda.c * Computer Boards PCIM-DDA06-16 Comedi driver * Author: Calin Culianu <[email protected]> * * COMEDI - Linux Control and Measurement Device Interface * Copyright (C) 2000 David A. Schleef <[email protected]> */ /* * Driver: cb_pcimdda * Description: Measurement Computing PCIM-DDA06-16 * Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda) * Author: Calin Culianu <[email protected]> * 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 <[email protected]> * for lending me a board so that I could write this driver. * * -Calin Culianu <[email protected]> */ #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 … /* * Register map, 8-bit access only */ #define PCIMDDA_DA_CHAN(x) … #define PCIMDDA_8255_BASE_REG … static int cb_pcimdda_ao_insn_write(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } static int cb_pcimdda_ao_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } static int cb_pcimdda_auto_attach(struct comedi_device *dev, unsigned long context_unused) { … } static struct comedi_driver cb_pcimdda_driver = …; static int cb_pcimdda_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) { … } static const struct pci_device_id cb_pcimdda_pci_table[] = …; MODULE_DEVICE_TABLE(pci, cb_pcimdda_pci_table); static struct pci_driver cb_pcimdda_driver_pci_driver = …; module_comedi_pci_driver(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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