1// SPDX-License-Identifier: GPL-2.0
2/*
3 * pcm3724.c
4 * Comedi driver for Advantech PCM-3724 Digital I/O board
5 *
6 * Drew Csillag <drew_csillag@yahoo.com>
7 */
8
9/*
10 * Driver: pcm3724
11 * Description: Advantech PCM-3724
12 * Devices: [Advantech] PCM-3724 (pcm3724)
13 * Author: Drew Csillag <drew_csillag@yahoo.com>
14 * Status: tested
15 *
16 * This is driver for digital I/O boards PCM-3724 with 48 DIO.
17 * It needs 8255.o for operations and only immediate mode is supported.
18 * See the source for configuration details.
19 *
20 * Copy/pasted/hacked from pcm724.c
21 *
22 * Configuration Options:
23 * [0] - I/O port base address
24 */
25
26#include <linux/module.h>
27#include <linux/comedi/comedidev.h>
28#include <linux/comedi/comedi_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 */
57struct priv_pcm3724 {
58 int dio_1;
59 int dio_2;
60};
61
62static 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
86static 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
97 /* 1 in io_bits indicates output, 1 in config indicates input */
98 if (!(s->io_bits & 0x0000ff))
99 config |= I8255_CTRL_A_IO;
100
101 if (!(s->io_bits & 0x00ff00))
102 config |= I8255_CTRL_B_IO;
103
104 if (!(s->io_bits & 0xff0000))
105 config |= I8255_CTRL_C_HI_IO | I8255_CTRL_C_LO_IO;
106
107 buffer_config = compute_buffer(config: 0, devno: 0, s: s_dio1);
108 buffer_config = compute_buffer(config: buffer_config, devno: 1, s: s_dio2);
109
110 if (s == s_dio1)
111 port_8255_cfg = dev->iobase + I8255_CTRL_REG;
112 else
113 port_8255_cfg = dev->iobase + I8255_SIZE + I8255_CTRL_REG;
114
115 outb(value: buffer_config, port: dev->iobase + PCM3724_DIO_DIR_REG);
116
117 outb(value: config, port: port_8255_cfg);
118}
119
120static void enable_chan(struct comedi_device *dev, struct comedi_subdevice *s,
121 int chanspec)
122{
123 struct priv_pcm3724 *priv = dev->private;
124 struct comedi_subdevice *s_dio1 = &dev->subdevices[0];
125 unsigned int mask;
126 int gatecfg;
127
128 gatecfg = 0;
129
130 mask = 1 << CR_CHAN(chanspec);
131 if (s == s_dio1)
132 priv->dio_1 |= mask;
133 else
134 priv->dio_2 |= mask;
135
136 if (priv->dio_1 & 0xff0000)
137 gatecfg |= PCM3724_GATE_CTRL_C0_ENA;
138
139 if (priv->dio_1 & 0xff00)
140 gatecfg |= PCM3724_GATE_CTRL_B0_ENA;
141
142 if (priv->dio_1 & 0xff)
143 gatecfg |= PCM3724_GATE_CTRL_A0_ENA;
144
145 if (priv->dio_2 & 0xff0000)
146 gatecfg |= PCM3724_GATE_CTRL_C1_ENA;
147
148 if (priv->dio_2 & 0xff00)
149 gatecfg |= PCM3724_GATE_CTRL_B1_ENA;
150
151 if (priv->dio_2 & 0xff)
152 gatecfg |= PCM3724_GATE_CTRL_A1_ENA;
153
154 outb(value: gatecfg, port: dev->iobase + PCM3724_GATE_CTRL_REG);
155}
156
157/* overriding the 8255 insn config */
158static int subdev_3724_insn_config(struct comedi_device *dev,
159 struct comedi_subdevice *s,
160 struct comedi_insn *insn,
161 unsigned int *data)
162{
163 unsigned int chan = CR_CHAN(insn->chanspec);
164 unsigned int mask;
165 int ret;
166
167 if (chan < 8)
168 mask = 0x0000ff;
169 else if (chan < 16)
170 mask = 0x00ff00;
171 else if (chan < 20)
172 mask = 0x0f0000;
173 else
174 mask = 0xf00000;
175
176 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
177 if (ret)
178 return ret;
179
180 do_3724_config(dev, s, chanspec: insn->chanspec);
181 enable_chan(dev, s, chanspec: insn->chanspec);
182
183 return insn->n;
184}
185
186static int pcm3724_attach(struct comedi_device *dev,
187 struct comedi_devconfig *it)
188{
189 struct priv_pcm3724 *priv;
190 struct comedi_subdevice *s;
191 int ret, i;
192
193 priv = comedi_alloc_devpriv(dev, size: sizeof(*priv));
194 if (!priv)
195 return -ENOMEM;
196
197 ret = comedi_request_region(dev, start: it->options[0], len: 0x10);
198 if (ret)
199 return ret;
200
201 ret = comedi_alloc_subdevices(dev, num_subdevices: 2);
202 if (ret)
203 return ret;
204
205 for (i = 0; i < dev->n_subdevices; i++) {
206 s = &dev->subdevices[i];
207 ret = subdev_8255_io_init(dev, s, regbase: i * I8255_SIZE);
208 if (ret)
209 return ret;
210 s->insn_config = subdev_3724_insn_config;
211 }
212 return 0;
213}
214
215static struct comedi_driver pcm3724_driver = {
216 .driver_name = "pcm3724",
217 .module = THIS_MODULE,
218 .attach = pcm3724_attach,
219 .detach = comedi_legacy_detach,
220};
221module_comedi_driver(pcm3724_driver);
222
223MODULE_AUTHOR("Comedi https://www.comedi.org");
224MODULE_DESCRIPTION("Comedi driver for Advantech PCM-3724 Digital I/O board");
225MODULE_LICENSE("GPL");
226

source code of linux/drivers/comedi/drivers/pcm3724.c