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36#include <linux/module.h>
37
38#include "../comedidev.h"
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60static const struct comedi_lrange das02_ao_ranges = {
61 6, {
62 UNI_RANGE(5),
63 UNI_RANGE(10),
64 BIP_RANGE(5),
65 BIP_RANGE(10),
66 RANGE_mA(4, 20),
67 RANGE_ext(0, 1)
68 }
69};
70
71
72
73
74#define DAC02_AO_LSB(x) (0x00 + ((x) * 2))
75#define DAC02_AO_MSB(x) (0x01 + ((x) * 2))
76
77static int dac02_ao_insn_write(struct comedi_device *dev,
78 struct comedi_subdevice *s,
79 struct comedi_insn *insn,
80 unsigned int *data)
81{
82 unsigned int chan = CR_CHAN(insn->chanspec);
83 unsigned int range = CR_RANGE(insn->chanspec);
84 unsigned int val;
85 int i;
86
87 for (i = 0; i < insn->n; i++) {
88 val = data[i];
89
90 s->readback[chan] = val;
91
92
93
94
95
96
97 if (comedi_range_is_bipolar(s, range))
98 val = s->maxdata - val;
99
100
101
102
103
104 outb((val << 4) & 0xf0, dev->iobase + DAC02_AO_LSB(chan));
105 outb((val >> 4) & 0xff, dev->iobase + DAC02_AO_MSB(chan));
106 }
107
108 return insn->n;
109}
110
111static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it)
112{
113 struct comedi_subdevice *s;
114 int ret;
115
116 ret = comedi_request_region(dev, it->options[0], 0x08);
117 if (ret)
118 return ret;
119
120 ret = comedi_alloc_subdevices(dev, 1);
121 if (ret)
122 return ret;
123
124
125 s = &dev->subdevices[0];
126 s->type = COMEDI_SUBD_AO;
127 s->subdev_flags = SDF_WRITABLE;
128 s->n_chan = 2;
129 s->maxdata = 0x0fff;
130 s->range_table = &das02_ao_ranges;
131 s->insn_write = dac02_ao_insn_write;
132
133 return comedi_alloc_subdev_readback(s);
134}
135
136static struct comedi_driver dac02_driver = {
137 .driver_name = "dac02",
138 .module = THIS_MODULE,
139 .attach = dac02_attach,
140 .detach = comedi_legacy_detach,
141};
142module_comedi_driver(dac02_driver);
143
144MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
145MODULE_DESCRIPTION("Comedi driver for DAC02 compatible boards");
146MODULE_LICENSE("GPL");
147