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44#include <linux/interrupt.h>
45#include "../comedidev.h"
46
47#include <linux/ioport.h>
48
49#define PCMAD_SIZE 4
50
51#define PCMAD_STATUS 0
52#define PCMAD_LSB 1
53#define PCMAD_MSB 2
54#define PCMAD_CONVERT 1
55
56struct pcmad_board_struct {
57 const char *name;
58 int n_ai_bits;
59};
60static const struct pcmad_board_struct pcmad_boards[] = {
61 {
62 .name = "pcmad12",
63 .n_ai_bits = 12,
64 },
65 {
66 .name = "pcmad16",
67 .n_ai_bits = 16,
68 },
69};
70
71#define this_board ((const struct pcmad_board_struct *)(dev->board_ptr))
72#define n_pcmad_boards ARRAY_SIZE(pcmad_boards)
73
74struct pcmad_priv_struct {
75 int differential;
76 int twos_comp;
77};
78#define devpriv ((struct pcmad_priv_struct *)dev->private)
79
80static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it);
81static int pcmad_detach(struct comedi_device *dev);
82static struct comedi_driver driver_pcmad = {
83 .driver_name = "pcmad",
84 .module = THIS_MODULE,
85 .attach = pcmad_attach,
86 .detach = pcmad_detach,
87 .board_name = &pcmad_boards[0].name,
88 .num_names = n_pcmad_boards,
89 .offset = sizeof(pcmad_boards[0]),
90};
91
92static int __init driver_pcmad_init_module(void)
93{
94 return comedi_driver_register(&driver_pcmad);
95}
96
97static void __exit driver_pcmad_cleanup_module(void)
98{
99 comedi_driver_unregister(&driver_pcmad);
100}
101
102module_init(driver_pcmad_init_module);
103module_exit(driver_pcmad_cleanup_module);
104
105#define TIMEOUT 100
106
107static int pcmad_ai_insn_read(struct comedi_device *dev,
108 struct comedi_subdevice *s,
109 struct comedi_insn *insn, unsigned int *data)
110{
111 int i;
112 int chan;
113 int n;
114
115 chan = CR_CHAN(insn->chanspec);
116
117 for (n = 0; n < insn->n; n++) {
118 outb(chan, dev->iobase + PCMAD_CONVERT);
119
120 for (i = 0; i < TIMEOUT; i++) {
121 if ((inb(dev->iobase + PCMAD_STATUS) & 0x3) == 0x3)
122 break;
123 }
124 data[n] = inb(dev->iobase + PCMAD_LSB);
125 data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8);
126
127 if (devpriv->twos_comp)
128 data[n] ^= (1 << (this_board->n_ai_bits - 1));
129 }
130
131 return n;
132}
133
134
135
136
137
138
139
140
141static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
142{
143 int ret;
144 struct comedi_subdevice *s;
145 unsigned long iobase;
146
147 iobase = it->options[0];
148 printk(KERN_INFO "comedi%d: pcmad: 0x%04lx ", dev->minor, iobase);
149 if (!request_region(iobase, PCMAD_SIZE, "pcmad")) {
150 printk(KERN_CONT "I/O port conflict\n");
151 return -EIO;
152 }
153 printk(KERN_CONT "\n");
154 dev->iobase = iobase;
155
156 ret = alloc_subdevices(dev, 1);
157 if (ret < 0)
158 return ret;
159
160 ret = alloc_private(dev, sizeof(struct pcmad_priv_struct));
161 if (ret < 0)
162 return ret;
163
164 dev->board_name = this_board->name;
165
166 s = dev->subdevices + 0;
167 s->type = COMEDI_SUBD_AI;
168 s->subdev_flags = SDF_READABLE | AREF_GROUND;
169 s->n_chan = 16;
170 s->len_chanlist = 1;
171 s->insn_read = pcmad_ai_insn_read;
172 s->maxdata = (1 << this_board->n_ai_bits) - 1;
173 s->range_table = &range_unknown;
174
175 return 0;
176}
177
178static int pcmad_detach(struct comedi_device *dev)
179{
180 printk(KERN_INFO "comedi%d: pcmad: remove\n", dev->minor);
181
182 if (dev->irq)
183 free_irq(dev->irq, dev);
184
185 if (dev->iobase)
186 release_region(dev->iobase, PCMAD_SIZE);
187
188 return 0;
189}
190
191MODULE_AUTHOR("Comedi http://www.comedi.org");
192MODULE_DESCRIPTION("Comedi low-level driver");
193MODULE_LICENSE("GPL");
194
