1 /*
2 * pcm3724.c
3 * Comedi driver for Advantech PCM-3724 Digital I/O board
4 *
5 * Drew Csillag <drew_csillag@yahoo.com>
6 */
7
8 /*
9 * Driver: pcm3724
10 * Description: Advantech PCM-3724
11 * Devices: [Advantech] PCM-3724 (pcm3724)
12 * Author: Drew Csillag <drew_csillag@yahoo.com>
13 * Status: tested
14 *
15 * This is driver for digital I/O boards PCM-3724 with 48 DIO.
16 * It needs 8255.o for operations and only immediate mode is supported.
17 * See the source for configuration details.
18 *
19 * Copy/pasted/hacked from pcm724.c
20 *
21 * Configuration Options:
22 * [0] - I/O port base address
23 */
24
25 #include <linux/module.h>
26 #include "../comedidev.h"
27
28 #include "8255.h"
29
30 /*
31 * Register I/O Map
32 *
33 * This board has two standard 8255 devices that provide six 8-bit DIO ports
34 * (48 channels total). Six 74HCT245 chips (one for each port) buffer the
35 * I/O lines to increase driving capability. Because the 74HCT245 is a
36 * bidirectional, tri-state line buffer, two additional I/O ports are used
37 * to control the direction of data and the enable of each port.
38 */
39 #define PCM3724_8255_0_BASE 0x00
40 #define PCM3724_8255_1_BASE 0x04
41 #define PCM3724_DIO_DIR_REG 0x08
42 #define PCM3724_DIO_DIR_C0_OUT BIT(0)
43 #define PCM3724_DIO_DIR_B0_OUT BIT(1)
44 #define PCM3724_DIO_DIR_A0_OUT BIT(2)
45 #define PCM3724_DIO_DIR_C1_OUT BIT(3)
46 #define PCM3724_DIO_DIR_B1_OUT BIT(4)
47 #define PCM3724_DIO_DIR_A1_OUT BIT(5)
48 #define PCM3724_GATE_CTRL_REG 0x09
49 #define PCM3724_GATE_CTRL_C0_ENA BIT(0)
50 #define PCM3724_GATE_CTRL_B0_ENA BIT(1)
51 #define PCM3724_GATE_CTRL_A0_ENA BIT(2)
52 #define PCM3724_GATE_CTRL_C1_ENA BIT(3)
53 #define PCM3724_GATE_CTRL_B1_ENA BIT(4)
54 #define PCM3724_GATE_CTRL_A1_ENA BIT(5)
55
56 /* used to track configured dios */
57 struct priv_pcm3724 {
58 int dio_1;
59 int dio_2;
60 };
61
compute_buffer(int config,int devno,struct comedi_subdevice * s)62 static int compute_buffer(int config, int devno, struct comedi_subdevice *s)
63 {
64 /* 1 in io_bits indicates output */
65 if (s->io_bits & 0x0000ff) {
66 if (devno == 0)
67 config |= PCM3724_DIO_DIR_A0_OUT;
68 else
69 config |= PCM3724_DIO_DIR_A1_OUT;
70 }
71 if (s->io_bits & 0x00ff00) {
72 if (devno == 0)
73 config |= PCM3724_DIO_DIR_B0_OUT;
74 else
75 config |= PCM3724_DIO_DIR_B1_OUT;
76 }
77 if (s->io_bits & 0xff0000) {
78 if (devno == 0)
79 config |= PCM3724_DIO_DIR_C0_OUT;
80 else
81 config |= PCM3724_DIO_DIR_C1_OUT;
82 }
83 return config;
84 }
85
do_3724_config(struct comedi_device * dev,struct comedi_subdevice * s,int chanspec)86 static void do_3724_config(struct comedi_device *dev,
87 struct comedi_subdevice *s, int chanspec)
88 {
89 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
90 struct comedi_subdevice *s_dio2 = &dev->subdevices[1];
91 int config;
92 int buffer_config;
93 unsigned long port_8255_cfg;
94
95 config = I8255_CTRL_CW;
96 buffer_config = 0;
97
98 /* 1 in io_bits indicates output, 1 in config indicates input */
99 if (!(s->io_bits & 0x0000ff))
100 config |= I8255_CTRL_A_IO;
101
102 if (!(s->io_bits & 0x00ff00))
103 config |= I8255_CTRL_B_IO;
104
105 if (!(s->io_bits & 0xff0000))
106 config |= I8255_CTRL_C_HI_IO | I8255_CTRL_C_LO_IO;
107
108 buffer_config = compute_buffer(0, 0, s_dio1);
109 buffer_config = compute_buffer(buffer_config, 1, s_dio2);
110
111 if (s == s_dio1)
112 port_8255_cfg = dev->iobase + I8255_CTRL_REG;
113 else
114 port_8255_cfg = dev->iobase + I8255_SIZE + I8255_CTRL_REG;
115
116 outb(buffer_config, dev->iobase + PCM3724_DIO_DIR_REG);
117
118 outb(config, port_8255_cfg);
119 }
120
enable_chan(struct comedi_device * dev,struct comedi_subdevice * s,int chanspec)121 static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s,
122 int chanspec)
123 {
124 struct priv_pcm3724 *priv = dev->private;
125 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
126 unsigned int mask;
127 int gatecfg;
128
129 gatecfg = 0;
130
131 mask = 1 << CR_CHAN(chanspec);
132 if (s == s_dio1)
133 priv->dio_1 |= mask;
134 else
135 priv->dio_2 |= mask;
136
137 if (priv->dio_1 & 0xff0000)
138 gatecfg |= PCM3724_GATE_CTRL_C0_ENA;
139
140 if (priv->dio_1 & 0xff00)
141 gatecfg |= PCM3724_GATE_CTRL_B0_ENA;
142
143 if (priv->dio_1 & 0xff)
144 gatecfg |= PCM3724_GATE_CTRL_A0_ENA;
145
146 if (priv->dio_2 & 0xff0000)
147 gatecfg |= PCM3724_GATE_CTRL_C1_ENA;
148
149 if (priv->dio_2 & 0xff00)
150 gatecfg |= PCM3724_GATE_CTRL_B1_ENA;
151
152 if (priv->dio_2 & 0xff)
153 gatecfg |= PCM3724_GATE_CTRL_A1_ENA;
154
155 outb(gatecfg, dev->iobase + PCM3724_GATE_CTRL_REG);
156 }
157
158 /* overriding the 8255 insn config */
subdev_3724_insn_config(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)159 static int subdev_3724_insn_config(struct comedi_device *dev,
160 struct comedi_subdevice *s,
161 struct comedi_insn *insn,
162 unsigned int *data)
163 {
164 unsigned int chan = CR_CHAN(insn->chanspec);
165 unsigned int mask;
166 int ret;
167
168 if (chan < 8)
169 mask = 0x0000ff;
170 else if (chan < 16)
171 mask = 0x00ff00;
172 else if (chan < 20)
173 mask = 0x0f0000;
174 else
175 mask = 0xf00000;
176
177 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
178 if (ret)
179 return ret;
180
181 do_3724_config(dev, s, insn->chanspec);
182 enable_chan(dev, s, insn->chanspec);
183
184 return insn->n;
185 }
186
pcm3724_attach(struct comedi_device * dev,struct comedi_devconfig * it)187 static int pcm3724_attach(struct comedi_device *dev,
188 struct comedi_devconfig *it)
189 {
190 struct priv_pcm3724 *priv;
191 struct comedi_subdevice *s;
192 int ret, i;
193
194 priv = comedi_alloc_devpriv(dev, sizeof(*priv));
195 if (!priv)
196 return -ENOMEM;
197
198 ret = comedi_request_region(dev, it->options[0], 0x10);
199 if (ret)
200 return ret;
201
202 ret = comedi_alloc_subdevices(dev, 2);
203 if (ret)
204 return ret;
205
206 for (i = 0; i < dev->n_subdevices; i++) {
207 s = &dev->subdevices[i];
208 ret = subdev_8255_init(dev, s, NULL, i * I8255_SIZE);
209 if (ret)
210 return ret;
211 s->insn_config = subdev_3724_insn_config;
212 }
213 return 0;
214 }
215
216 static struct comedi_driver pcm3724_driver = {
217 .driver_name = "pcm3724",
218 .module = THIS_MODULE,
219 .attach = pcm3724_attach,
220 .detach = comedi_legacy_detach,
221 };
222 module_comedi_driver(pcm3724_driver);
223
224 MODULE_AUTHOR("Comedi http://www.comedi.org");
225 MODULE_DESCRIPTION("Comedi driver for Advantech PCM-3724 Digital I/O board");
226 MODULE_LICENSE("GPL");
227