1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * comedi/drivers/dt2817.c 4 * Hardware driver for Data Translation DT2817 5 * 6 * COMEDI - Linux Control and Measurement Device Interface 7 * Copyright (C) 1998 David A. Schleef <ds@schleef.org> 8 */ 9 /* 10 * Driver: dt2817 11 * Description: Data Translation DT2817 12 * Author: ds 13 * Status: complete 14 * Devices: [Data Translation] DT2817 (dt2817) 15 * 16 * A very simple digital I/O card. Four banks of 8 lines, each bank 17 * is configurable for input or output. One wonders why it takes a 18 * 50 page manual to describe this thing. 19 * 20 * The driver (which, btw, is much less than 50 pages) has 1 subdevice 21 * with 32 channels, configurable in groups of 8. 22 * 23 * Configuration options: 24 * [0] - I/O port base base address 25 */ 26 27 #include <linux/module.h> 28 #include <linux/comedi/comedidev.h> 29 30 #define DT2817_CR 0 31 #define DT2817_DATA 1 32 33 static int dt2817_dio_insn_config(struct comedi_device *dev, 34 struct comedi_subdevice *s, 35 struct comedi_insn *insn, 36 unsigned int *data) 37 { 38 unsigned int chan = CR_CHAN(insn->chanspec); 39 unsigned int oe = 0; 40 unsigned int mask; 41 int ret; 42 43 if (chan < 8) 44 mask = 0x000000ff; 45 else if (chan < 16) 46 mask = 0x0000ff00; 47 else if (chan < 24) 48 mask = 0x00ff0000; 49 else 50 mask = 0xff000000; 51 52 ret = comedi_dio_insn_config(dev, s, insn, data, mask); 53 if (ret) 54 return ret; 55 56 if (s->io_bits & 0x000000ff) 57 oe |= 0x1; 58 if (s->io_bits & 0x0000ff00) 59 oe |= 0x2; 60 if (s->io_bits & 0x00ff0000) 61 oe |= 0x4; 62 if (s->io_bits & 0xff000000) 63 oe |= 0x8; 64 65 outb(oe, dev->iobase + DT2817_CR); 66 67 return insn->n; 68 } 69 70 static int dt2817_dio_insn_bits(struct comedi_device *dev, 71 struct comedi_subdevice *s, 72 struct comedi_insn *insn, 73 unsigned int *data) 74 { 75 unsigned long iobase = dev->iobase + DT2817_DATA; 76 unsigned int mask; 77 unsigned int val; 78 79 mask = comedi_dio_update_state(s, data); 80 if (mask) { 81 if (mask & 0x000000ff) 82 outb(s->state & 0xff, iobase + 0); 83 if (mask & 0x0000ff00) 84 outb((s->state >> 8) & 0xff, iobase + 1); 85 if (mask & 0x00ff0000) 86 outb((s->state >> 16) & 0xff, iobase + 2); 87 if (mask & 0xff000000) 88 outb((s->state >> 24) & 0xff, iobase + 3); 89 } 90 91 val = inb(iobase + 0); 92 val |= (inb(iobase + 1) << 8); 93 val |= (inb(iobase + 2) << 16); 94 val |= (inb(iobase + 3) << 24); 95 96 data[1] = val; 97 98 return insn->n; 99 } 100 101 static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it) 102 { 103 int ret; 104 struct comedi_subdevice *s; 105 106 ret = comedi_request_region(dev, it->options[0], 0x5); 107 if (ret) 108 return ret; 109 110 ret = comedi_alloc_subdevices(dev, 1); 111 if (ret) 112 return ret; 113 114 s = &dev->subdevices[0]; 115 116 s->n_chan = 32; 117 s->type = COMEDI_SUBD_DIO; 118 s->subdev_flags = SDF_READABLE | SDF_WRITABLE; 119 s->range_table = &range_digital; 120 s->maxdata = 1; 121 s->insn_bits = dt2817_dio_insn_bits; 122 s->insn_config = dt2817_dio_insn_config; 123 124 s->state = 0; 125 outb(0, dev->iobase + DT2817_CR); 126 127 return 0; 128 } 129 130 static struct comedi_driver dt2817_driver = { 131 .driver_name = "dt2817", 132 .module = THIS_MODULE, 133 .attach = dt2817_attach, 134 .detach = comedi_legacy_detach, 135 }; 136 module_comedi_driver(dt2817_driver); 137 138 MODULE_AUTHOR("Comedi https://www.comedi.org"); 139 MODULE_DESCRIPTION("Comedi low-level driver"); 140 MODULE_LICENSE("GPL"); 141