1 /*
2 comedi/drivers/pcm724.c
3
4 Drew Csillag <drew_csillag@yahoo.com>
5
6 hardware driver for Advantech card:
7 card: PCM-3724
8 driver: pcm3724
9
10 Options for PCM-3724
11 [0] - IO Base
12 */
13 /*
14 Driver: pcm3724
15 Description: Advantech PCM-3724
16 Author: Drew Csillag <drew_csillag@yahoo.com>
17 Devices: [Advantech] PCM-3724 (pcm724)
18 Status: tested
19
20 This is driver for digital I/O boards PCM-3724 with 48 DIO.
21 It needs 8255.o for operations and only immediate mode is supported.
22 See the source for configuration details.
23
24 Copy/pasted/hacked from pcm724.c
25 */
26 /*
27 * check_driver overrides:
28 * struct comedi_insn
29 */
30
31 #include <linux/module.h>
32 #include "../comedidev.h"
33
34 #include "8255.h"
35
36 #define BUF_C0 0x1
37 #define BUF_B0 0x2
38 #define BUF_A0 0x4
39 #define BUF_C1 0x8
40 #define BUF_B1 0x10
41 #define BUF_A1 0x20
42
43 #define GATE_A0 0x4
44 #define GATE_B0 0x2
45 #define GATE_C0 0x1
46 #define GATE_A1 0x20
47 #define GATE_B1 0x10
48 #define GATE_C1 0x8
49
50 /* used to track configured dios */
51 struct priv_pcm3724 {
52 int dio_1;
53 int dio_2;
54 };
55
compute_buffer(int config,int devno,struct comedi_subdevice * s)56 static int compute_buffer(int config, int devno, struct comedi_subdevice *s)
57 {
58 /* 1 in io_bits indicates output */
59 if (s->io_bits & 0x0000ff) {
60 if (devno == 0)
61 config |= BUF_A0;
62 else
63 config |= BUF_A1;
64 }
65 if (s->io_bits & 0x00ff00) {
66 if (devno == 0)
67 config |= BUF_B0;
68 else
69 config |= BUF_B1;
70 }
71 if (s->io_bits & 0xff0000) {
72 if (devno == 0)
73 config |= BUF_C0;
74 else
75 config |= BUF_C1;
76 }
77 return config;
78 }
79
do_3724_config(struct comedi_device * dev,struct comedi_subdevice * s,int chanspec)80 static void do_3724_config(struct comedi_device *dev,
81 struct comedi_subdevice *s, int chanspec)
82 {
83 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
84 struct comedi_subdevice *s_dio2 = &dev->subdevices[1];
85 int config;
86 int buffer_config;
87 unsigned long port_8255_cfg;
88
89 config = I8255_CTRL_CW;
90 buffer_config = 0;
91
92 /* 1 in io_bits indicates output, 1 in config indicates input */
93 if (!(s->io_bits & 0x0000ff))
94 config |= I8255_CTRL_A_IO;
95
96 if (!(s->io_bits & 0x00ff00))
97 config |= I8255_CTRL_B_IO;
98
99 if (!(s->io_bits & 0xff0000))
100 config |= I8255_CTRL_C_HI_IO | I8255_CTRL_C_LO_IO;
101
102 buffer_config = compute_buffer(0, 0, s_dio1);
103 buffer_config = compute_buffer(buffer_config, 1, s_dio2);
104
105 if (s == s_dio1)
106 port_8255_cfg = dev->iobase + I8255_CTRL_REG;
107 else
108 port_8255_cfg = dev->iobase + I8255_SIZE + I8255_CTRL_REG;
109
110 outb(buffer_config, dev->iobase + 8); /* update buffer register */
111
112 outb(config, port_8255_cfg);
113 }
114
enable_chan(struct comedi_device * dev,struct comedi_subdevice * s,int chanspec)115 static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s,
116 int chanspec)
117 {
118 struct priv_pcm3724 *priv = dev->private;
119 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
120 unsigned int mask;
121 int gatecfg;
122
123 gatecfg = 0;
124
125 mask = 1 << CR_CHAN(chanspec);
126 if (s == s_dio1)
127 priv->dio_1 |= mask;
128 else
129 priv->dio_2 |= mask;
130
131 if (priv->dio_1 & 0xff0000)
132 gatecfg |= GATE_C0;
133
134 if (priv->dio_1 & 0xff00)
135 gatecfg |= GATE_B0;
136
137 if (priv->dio_1 & 0xff)
138 gatecfg |= GATE_A0;
139
140 if (priv->dio_2 & 0xff0000)
141 gatecfg |= GATE_C1;
142
143 if (priv->dio_2 & 0xff00)
144 gatecfg |= GATE_B1;
145
146 if (priv->dio_2 & 0xff)
147 gatecfg |= GATE_A1;
148
149 outb(gatecfg, dev->iobase + 9);
150 }
151
152 /* overriding the 8255 insn config */
subdev_3724_insn_config(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)153 static int subdev_3724_insn_config(struct comedi_device *dev,
154 struct comedi_subdevice *s,
155 struct comedi_insn *insn,
156 unsigned int *data)
157 {
158 unsigned int chan = CR_CHAN(insn->chanspec);
159 unsigned int mask;
160 int ret;
161
162 if (chan < 8)
163 mask = 0x0000ff;
164 else if (chan < 16)
165 mask = 0x00ff00;
166 else if (chan < 20)
167 mask = 0x0f0000;
168 else
169 mask = 0xf00000;
170
171 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
172 if (ret)
173 return ret;
174
175 do_3724_config(dev, s, insn->chanspec);
176 enable_chan(dev, s, insn->chanspec);
177
178 return insn->n;
179 }
180
pcm3724_attach(struct comedi_device * dev,struct comedi_devconfig * it)181 static int pcm3724_attach(struct comedi_device *dev,
182 struct comedi_devconfig *it)
183 {
184 struct priv_pcm3724 *priv;
185 struct comedi_subdevice *s;
186 int ret, i;
187
188 priv = comedi_alloc_devpriv(dev, sizeof(*priv));
189 if (!priv)
190 return -ENOMEM;
191
192 ret = comedi_request_region(dev, it->options[0], 0x10);
193 if (ret)
194 return ret;
195
196 ret = comedi_alloc_subdevices(dev, 2);
197 if (ret)
198 return ret;
199
200 for (i = 0; i < dev->n_subdevices; i++) {
201 s = &dev->subdevices[i];
202 ret = subdev_8255_init(dev, s, NULL, i * I8255_SIZE);
203 if (ret)
204 return ret;
205 s->insn_config = subdev_3724_insn_config;
206 }
207 return 0;
208 }
209
210 static struct comedi_driver pcm3724_driver = {
211 .driver_name = "pcm3724",
212 .module = THIS_MODULE,
213 .attach = pcm3724_attach,
214 .detach = comedi_legacy_detach,
215 };
216 module_comedi_driver(pcm3724_driver);
217
218 MODULE_AUTHOR("Comedi http://www.comedi.org");
219 MODULE_DESCRIPTION("Comedi low-level driver");
220 MODULE_LICENSE("GPL");
221