149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* pcmad.c
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* Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 2000,2001 David A. Schleef <ds@schleef.org>
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*/
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/*
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* Driver: pcmad
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* Description: Winsystems PCM-A/D12, PCM-A/D16
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* Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16)
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* Author: ds
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* Status: untested
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*
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* This driver was written on a bet that I couldn't write a driver
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* in less than 2 hours. I won the bet, but never got paid. =(
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*
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* Configuration options:
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* [0] - I/O port base
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* [1] - IRQ (unused)
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* [2] - Analog input reference (must match jumpers)
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* 0 = single-ended (16 channels)
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* 1 = differential (8 channels)
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* [3] - Analog input encoding (must match jumpers)
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* 0 = straight binary (0-5V input range)
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* 1 = two's complement (+-10V input range)
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*/
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#include <linux/module.h>
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#include <linux/comedi/comedidev.h>
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#define PCMAD_STATUS 0
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#define PCMAD_LSB 1
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#define PCMAD_MSB 2
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#define PCMAD_CONVERT 1
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struct pcmad_board_struct {
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const char *name;
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unsigned int ai_maxdata;
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};
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static const struct pcmad_board_struct pcmad_boards[] = {
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{
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.name = "pcmad12",
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.ai_maxdata = 0x0fff,
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}, {
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.name = "pcmad16",
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.ai_maxdata = 0xffff,
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},
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};
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static int pcmad_ai_eoc(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned long context)
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{
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unsigned int status;
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status = inb(dev->iobase + PCMAD_STATUS);
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if ((status & 0x3) == 0x3)
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return 0;
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return -EBUSY;
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}
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static int pcmad_ai_insn_read(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data)
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{
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unsigned int chan = CR_CHAN(insn->chanspec);
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unsigned int range = CR_RANGE(insn->chanspec);
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unsigned int val;
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int ret;
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int i;
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for (i = 0; i < insn->n; i++) {
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outb(chan, dev->iobase + PCMAD_CONVERT);
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ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
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if (ret)
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return ret;
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val = inb(dev->iobase + PCMAD_LSB) |
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(inb(dev->iobase + PCMAD_MSB) << 8);
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/* data is shifted on the pcmad12, fix it */
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if (s->maxdata == 0x0fff)
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val >>= 4;
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if (comedi_range_is_bipolar(s, range)) {
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/* munge the two's complement value */
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val ^= ((s->maxdata + 1) >> 1);
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}
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data[i] = val;
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}
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return insn->n;
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}
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static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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{
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const struct pcmad_board_struct *board = dev->board_ptr;
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struct comedi_subdevice *s;
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int ret;
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ret = comedi_request_region(dev, it->options[0], 0x04);
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if (ret)
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return ret;
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ret = comedi_alloc_subdevices(dev, 1);
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if (ret)
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return ret;
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s = &dev->subdevices[0];
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s->type = COMEDI_SUBD_AI;
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if (it->options[1]) {
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/* 8 differential channels */
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s->subdev_flags = SDF_READABLE | AREF_DIFF;
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s->n_chan = 8;
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} else {
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/* 16 single-ended channels */
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s->subdev_flags = SDF_READABLE | AREF_GROUND;
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s->n_chan = 16;
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}
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s->len_chanlist = 1;
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s->maxdata = board->ai_maxdata;
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s->range_table = it->options[2] ? &range_bipolar10 : &range_unipolar5;
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s->insn_read = pcmad_ai_insn_read;
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return 0;
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}
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static struct comedi_driver pcmad_driver = {
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.driver_name = "pcmad",
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.module = THIS_MODULE,
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.attach = pcmad_attach,
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.detach = comedi_legacy_detach,
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.board_name = &pcmad_boards[0].name,
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.num_names = ARRAY_SIZE(pcmad_boards),
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.offset = sizeof(pcmad_boards[0]),
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};
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module_comedi_driver(pcmad_driver);
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MODULE_AUTHOR("Comedi https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi low-level driver");
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MODULE_LICENSE("GPL");
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