1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * rti802.c
4 * Comedi driver for Analog Devices RTI-802 board
5 *
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
8 */
9
10 /*
11 * Driver: rti802
12 * Description: Analog Devices RTI-802
13 * Author: Anders Blomdell <anders.blomdell@control.lth.se>
14 * Devices: [Analog Devices] RTI-802 (rti802)
15 * Status: works
16 *
17 * Configuration Options:
18 * [0] - i/o base
19 * [1] - unused
20 * [2,4,6,8,10,12,14,16] - dac#[0-7] 0=two's comp, 1=straight
21 * [3,5,7,9,11,13,15,17] - dac#[0-7] 0=bipolar, 1=unipolar
22 */
23
24 #include <linux/module.h>
25 #include <linux/comedi/comedidev.h>
26
27 /*
28 * Register I/O map
29 */
30 #define RTI802_SELECT 0x00
31 #define RTI802_DATALOW 0x01
32 #define RTI802_DATAHIGH 0x02
33
34 struct rti802_private {
35 enum {
36 dac_2comp, dac_straight
37 } dac_coding[8];
38 const struct comedi_lrange *range_type_list[8];
39 };
40
rti802_ao_insn_write(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)41 static int rti802_ao_insn_write(struct comedi_device *dev,
42 struct comedi_subdevice *s,
43 struct comedi_insn *insn,
44 unsigned int *data)
45 {
46 struct rti802_private *devpriv = dev->private;
47 unsigned int chan = CR_CHAN(insn->chanspec);
48 int i;
49
50 outb(chan, dev->iobase + RTI802_SELECT);
51
52 for (i = 0; i < insn->n; i++) {
53 unsigned int val = data[i];
54
55 s->readback[chan] = val;
56
57 /* munge offset binary to two's complement if needed */
58 if (devpriv->dac_coding[chan] == dac_2comp)
59 val = comedi_offset_munge(s, val);
60
61 outb(val & 0xff, dev->iobase + RTI802_DATALOW);
62 outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH);
63 }
64
65 return insn->n;
66 }
67
rti802_attach(struct comedi_device * dev,struct comedi_devconfig * it)68 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
69 {
70 struct rti802_private *devpriv;
71 struct comedi_subdevice *s;
72 int i;
73 int ret;
74
75 ret = comedi_request_region(dev, it->options[0], 0x04);
76 if (ret)
77 return ret;
78
79 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
80 if (!devpriv)
81 return -ENOMEM;
82
83 ret = comedi_alloc_subdevices(dev, 1);
84 if (ret)
85 return ret;
86
87 /* Analog Output subdevice */
88 s = &dev->subdevices[0];
89 s->type = COMEDI_SUBD_AO;
90 s->subdev_flags = SDF_WRITABLE;
91 s->maxdata = 0xfff;
92 s->n_chan = 8;
93 s->insn_write = rti802_ao_insn_write;
94
95 ret = comedi_alloc_subdev_readback(s);
96 if (ret)
97 return ret;
98
99 s->range_table_list = devpriv->range_type_list;
100 for (i = 0; i < 8; i++) {
101 devpriv->dac_coding[i] = (it->options[3 + 2 * i])
102 ? (dac_straight) : (dac_2comp);
103 devpriv->range_type_list[i] = (it->options[2 + 2 * i])
104 ? &range_unipolar10 : &range_bipolar10;
105 }
106
107 return 0;
108 }
109
110 static struct comedi_driver rti802_driver = {
111 .driver_name = "rti802",
112 .module = THIS_MODULE,
113 .attach = rti802_attach,
114 .detach = comedi_legacy_detach,
115 };
116 module_comedi_driver(rti802_driver);
117
118 MODULE_AUTHOR("Comedi https://www.comedi.org");
119 MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board");
120 MODULE_LICENSE("GPL");
121