1/* 2 comedi/drivers/dt2817.c 3 Hardware driver for Data Translation DT2817 4 5 COMEDI - Linux Control and Measurement Device Interface 6 Copyright (C) 1998 David A. Schleef <ds@schleef.org> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17*/ 18/* 19Driver: dt2817 20Description: Data Translation DT2817 21Author: ds 22Status: complete 23Devices: [Data Translation] DT2817 (dt2817) 24 25A very simple digital I/O card. Four banks of 8 lines, each bank 26is configurable for input or output. One wonders why it takes a 2750 page manual to describe this thing. 28 29The driver (which, btw, is much less than 50 pages) has 1 subdevice 30with 32 channels, configurable in groups of 8. 31 32Configuration options: 33 [0] - I/O port base base address 34*/ 35 36#include <linux/module.h> 37#include "../comedidev.h" 38 39#define DT2817_CR 0 40#define DT2817_DATA 1 41 42static int dt2817_dio_insn_config(struct comedi_device *dev, 43 struct comedi_subdevice *s, 44 struct comedi_insn *insn, 45 unsigned int *data) 46{ 47 unsigned int chan = CR_CHAN(insn->chanspec); 48 unsigned int oe = 0; 49 unsigned int mask; 50 int ret; 51 52 if (chan < 8) 53 mask = 0x000000ff; 54 else if (chan < 16) 55 mask = 0x0000ff00; 56 else if (chan < 24) 57 mask = 0x00ff0000; 58 else 59 mask = 0xff000000; 60 61 ret = comedi_dio_insn_config(dev, s, insn, data, mask); 62 if (ret) 63 return ret; 64 65 if (s->io_bits & 0x000000ff) 66 oe |= 0x1; 67 if (s->io_bits & 0x0000ff00) 68 oe |= 0x2; 69 if (s->io_bits & 0x00ff0000) 70 oe |= 0x4; 71 if (s->io_bits & 0xff000000) 72 oe |= 0x8; 73 74 outb(oe, dev->iobase + DT2817_CR); 75 76 return insn->n; 77} 78 79static int dt2817_dio_insn_bits(struct comedi_device *dev, 80 struct comedi_subdevice *s, 81 struct comedi_insn *insn, 82 unsigned int *data) 83{ 84 unsigned long iobase = dev->iobase + DT2817_DATA; 85 unsigned int mask; 86 unsigned int val; 87 88 mask = comedi_dio_update_state(s, data); 89 if (mask) { 90 if (mask & 0x000000ff) 91 outb(s->state & 0xff, iobase + 0); 92 if (mask & 0x0000ff00) 93 outb((s->state >> 8) & 0xff, iobase + 1); 94 if (mask & 0x00ff0000) 95 outb((s->state >> 16) & 0xff, iobase + 2); 96 if (mask & 0xff000000) 97 outb((s->state >> 24) & 0xff, iobase + 3); 98 } 99 100 val = inb(iobase + 0); 101 val |= (inb(iobase + 1) << 8); 102 val |= (inb(iobase + 2) << 16); 103 val |= (inb(iobase + 3) << 24); 104 105 data[1] = val; 106 107 return insn->n; 108} 109 110static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it) 111{ 112 int ret; 113 struct comedi_subdevice *s; 114 115 ret = comedi_request_region(dev, it->options[0], 0x5); 116 if (ret) 117 return ret; 118 119 ret = comedi_alloc_subdevices(dev, 1); 120 if (ret) 121 return ret; 122 123 s = &dev->subdevices[0]; 124 125 s->n_chan = 32; 126 s->type = COMEDI_SUBD_DIO; 127 s->subdev_flags = SDF_READABLE | SDF_WRITABLE; 128 s->range_table = &range_digital; 129 s->maxdata = 1; 130 s->insn_bits = dt2817_dio_insn_bits; 131 s->insn_config = dt2817_dio_insn_config; 132 133 s->state = 0; 134 outb(0, dev->iobase + DT2817_CR); 135 136 return 0; 137} 138 139static struct comedi_driver dt2817_driver = { 140 .driver_name = "dt2817", 141 .module = THIS_MODULE, 142 .attach = dt2817_attach, 143 .detach = comedi_legacy_detach, 144}; 145module_comedi_driver(dt2817_driver); 146 147MODULE_AUTHOR("Comedi http://www.comedi.org"); 148MODULE_DESCRIPTION("Comedi low-level driver"); 149MODULE_LICENSE("GPL"); 150