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31#include <linux/module.h>
32#include "../comedidev.h"
33
34#include "8255.h"
35
36#define PCM3724_SIZE 16
37#define SIZE_8255 4
38
39#define BUF_C0 0x1
40#define BUF_B0 0x2
41#define BUF_A0 0x4
42#define BUF_C1 0x8
43#define BUF_B1 0x10
44#define BUF_A1 0x20
45
46#define GATE_A0 0x4
47#define GATE_B0 0x2
48#define GATE_C0 0x1
49#define GATE_A1 0x20
50#define GATE_B1 0x10
51#define GATE_C1 0x8
52
53
54#define CR_CW 0x80
55#define _8255_CR 3
56#define CR_B_IO 0x02
57#define CR_B_MODE 0x04
58#define CR_C_IO 0x09
59#define CR_A_IO 0x10
60#define CR_A_MODE(a) ((a)<<5)
61#define CR_CW 0x80
62
63
64struct priv_pcm3724 {
65 int dio_1;
66 int dio_2;
67};
68
69static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
70{
71 unsigned long iobase = arg;
72 unsigned char inbres;
73 if (dir) {
74 outb(data, iobase + port);
75 return 0;
76 } else {
77 inbres = inb(iobase + port);
78 return inbres;
79 }
80}
81
82static int compute_buffer(int config, int devno, struct comedi_subdevice *s)
83{
84
85 if (s->io_bits & 0x0000ff) {
86 if (devno == 0)
87 config |= BUF_A0;
88 else
89 config |= BUF_A1;
90 }
91 if (s->io_bits & 0x00ff00) {
92 if (devno == 0)
93 config |= BUF_B0;
94 else
95 config |= BUF_B1;
96 }
97 if (s->io_bits & 0xff0000) {
98 if (devno == 0)
99 config |= BUF_C0;
100 else
101 config |= BUF_C1;
102 }
103 return config;
104}
105
106static void do_3724_config(struct comedi_device *dev,
107 struct comedi_subdevice *s, int chanspec)
108{
109 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
110 struct comedi_subdevice *s_dio2 = &dev->subdevices[1];
111 int config;
112 int buffer_config;
113 unsigned long port_8255_cfg;
114
115 config = CR_CW;
116 buffer_config = 0;
117
118
119 if (!(s->io_bits & 0x0000ff))
120 config |= CR_A_IO;
121
122 if (!(s->io_bits & 0x00ff00))
123 config |= CR_B_IO;
124
125 if (!(s->io_bits & 0xff0000))
126 config |= CR_C_IO;
127
128 buffer_config = compute_buffer(0, 0, s_dio1);
129 buffer_config = compute_buffer(buffer_config, 1, s_dio2);
130
131 if (s == s_dio1)
132 port_8255_cfg = dev->iobase + _8255_CR;
133 else
134 port_8255_cfg = dev->iobase + SIZE_8255 + _8255_CR;
135
136 outb(buffer_config, dev->iobase + 8);
137
138 outb(config, port_8255_cfg);
139}
140
141static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s,
142 int chanspec)
143{
144 struct priv_pcm3724 *priv = dev->private;
145 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
146 unsigned int mask;
147 int gatecfg;
148
149 gatecfg = 0;
150
151 mask = 1 << CR_CHAN(chanspec);
152 if (s == s_dio1)
153 priv->dio_1 |= mask;
154 else
155 priv->dio_2 |= mask;
156
157 if (priv->dio_1 & 0xff0000)
158 gatecfg |= GATE_C0;
159
160 if (priv->dio_1 & 0xff00)
161 gatecfg |= GATE_B0;
162
163 if (priv->dio_1 & 0xff)
164 gatecfg |= GATE_A0;
165
166 if (priv->dio_2 & 0xff0000)
167 gatecfg |= GATE_C1;
168
169 if (priv->dio_2 & 0xff00)
170 gatecfg |= GATE_B1;
171
172 if (priv->dio_2 & 0xff)
173 gatecfg |= GATE_A1;
174
175 outb(gatecfg, dev->iobase + 9);
176}
177
178
179static int subdev_3724_insn_config(struct comedi_device *dev,
180 struct comedi_subdevice *s,
181 struct comedi_insn *insn,
182 unsigned int *data)
183{
184 unsigned int chan = CR_CHAN(insn->chanspec);
185 unsigned int mask;
186 int ret;
187
188 if (chan < 8)
189 mask = 0x0000ff;
190 else if (chan < 16)
191 mask = 0x00ff00;
192 else if (chan < 20)
193 mask = 0x0f0000;
194 else
195 mask = 0xf00000;
196
197 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
198 if (ret)
199 return ret;
200
201 do_3724_config(dev, s, insn->chanspec);
202 enable_chan(dev, s, insn->chanspec);
203
204 return insn->n;
205}
206
207static int pcm3724_attach(struct comedi_device *dev,
208 struct comedi_devconfig *it)
209{
210 struct priv_pcm3724 *priv;
211 struct comedi_subdevice *s;
212 int ret, i;
213
214 priv = comedi_alloc_devpriv(dev, sizeof(*priv));
215 if (!priv)
216 return -ENOMEM;
217
218 ret = comedi_request_region(dev, it->options[0], PCM3724_SIZE);
219 if (ret)
220 return ret;
221
222 ret = comedi_alloc_subdevices(dev, 2);
223 if (ret)
224 return ret;
225
226 for (i = 0; i < dev->n_subdevices; i++) {
227 s = &dev->subdevices[i];
228 subdev_8255_init(dev, s, subdev_8255_cb,
229 (unsigned long)(dev->iobase + SIZE_8255 * i));
230 s->insn_config = subdev_3724_insn_config;
231 }
232 return 0;
233}
234
235static struct comedi_driver pcm3724_driver = {
236 .driver_name = "pcm3724",
237 .module = THIS_MODULE,
238 .attach = pcm3724_attach,
239 .detach = comedi_legacy_detach,
240};
241module_comedi_driver(pcm3724_driver);
242
243MODULE_AUTHOR("Comedi http://www.comedi.org");
244MODULE_DESCRIPTION("Comedi low-level driver");
245MODULE_LICENSE("GPL");
246
