2 comedi/drivers/ssv_dnp.c
3 generic comedi driver for SSV Embedded Systems' DIL/Net-PCs
4 Copyright (C) 2001 Robert Schwebel <robert@schwebel.de>
6 COMEDI - Linux Control and Measurement Device Interface
7 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 Description: SSV Embedded Systems DIL/Net-PC
27 Author: Robert Schwebel <robert@schwebel.de>
28 Devices: [SSV Embedded Systems] DIL/Net-PC 1486 (dnp-1486)
32 /* include files ----------------------------------------------------------- */
34 #include "../comedidev.h"
36 /* Some global definitions: the registers of the DNP ----------------------- */
38 /* For port A and B the mode register has bits corresponding to the output */
39 /* pins, where Bit-N = 0 -> input, Bit-N = 1 -> output. Note that bits */
40 /* 4 to 7 correspond to pin 0..3 for port C data register. Ensure that bits */
41 /* 0..3 remain unchanged! For details about Port C Mode Register see */
42 /* the remarks in dnp_insn_config() below. */
44 #define CSCIR 0x22 /* Chip Setup and Control Index Register */
45 #define CSCDR 0x23 /* Chip Setup and Control Data Register */
46 #define PAMR 0xa5 /* Port A Mode Register */
47 #define PADR 0xa9 /* Port A Data Register */
48 #define PBMR 0xa4 /* Port B Mode Register */
49 #define PBDR 0xa8 /* Port B Data Register */
50 #define PCMR 0xa3 /* Port C Mode Register */
51 #define PCDR 0xa7 /* Port C Data Register */
53 /* ------------------------------------------------------------------------- */
54 /* The insn_bits interface allows packed reading/writing of DIO channels. */
55 /* The comedi core can convert between insn_bits and insn_read/write, so you */
56 /* are able to use these instructions as well. */
57 /* ------------------------------------------------------------------------- */
59 static int dnp_dio_insn_bits(struct comedi_device *dev,
60 struct comedi_subdevice *s,
61 struct comedi_insn *insn, unsigned int *data)
63 /* The insn data is a mask in data[0] and the new data in data[1], */
64 /* each channel cooresponding to a bit. */
66 /* Ports A and B are straight forward: each bit corresponds to an */
67 /* output pin with the same order. Port C is different: bits 0...3 */
68 /* correspond to bits 4...7 of the output register (PCDR). */
74 & ~(u8) (data[0] & 0x0000FF))
75 | (u8) (data[1] & 0x0000FF), CSCDR);
79 & ~(u8) ((data[0] & 0x00FF00) >> 8))
80 | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
84 & ~(u8) ((data[0] & 0x0F0000) >> 12))
85 | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
88 /* on return, data[1] contains the value of the digital input lines. */
92 data[0] += inb(CSCDR) << 8;
94 data[0] += ((inb(CSCDR) & 0xF0) << 12);
100 /* ------------------------------------------------------------------------- */
101 /* Configure the direction of the bidirectional digital i/o pins. chanspec */
102 /* contains the channel to be changed and data[0] contains either */
103 /* COMEDI_INPUT or COMEDI_OUTPUT. */
104 /* ------------------------------------------------------------------------- */
106 static int dnp_dio_insn_config(struct comedi_device *dev,
107 struct comedi_subdevice *s,
108 struct comedi_insn *insn, unsigned int *data)
113 /* reduces chanspec to lower 16 bits */
114 int chan = CR_CHAN(insn->chanspec);
117 case INSN_CONFIG_DIO_OUTPUT:
118 case INSN_CONFIG_DIO_INPUT:
120 case INSN_CONFIG_DIO_QUERY:
122 (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
129 /* Test: which port does the channel belong to? */
131 /* We have to pay attention with port C: this is the meaning of PCMR: */
132 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */
133 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */
135 if ((chan >= 0) && (chan <= 7)) {
138 } else if ((chan >= 8) && (chan <= 15)) {
142 } else if ((chan >= 16) && (chan <= 19)) {
143 /* this is port C; multiplication with 2 brings bits into */
144 /* correct position for PCMR! */
152 /* read 'old' direction of the port and set bits (out=1, in=0) */
153 register_buffer = inb(CSCDR);
154 if (data[0] == COMEDI_OUTPUT)
155 register_buffer |= (1 << chan);
157 register_buffer &= ~(1 << chan);
159 outb(register_buffer, CSCDR);
165 static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
167 struct comedi_subdevice *s;
170 ret = comedi_alloc_subdevices(dev, 1);
174 s = &dev->subdevices[0];
175 /* digital i/o subdevice */
176 s->type = COMEDI_SUBD_DIO;
177 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
180 s->range_table = &range_digital;
181 s->insn_bits = dnp_dio_insn_bits;
182 s->insn_config = dnp_dio_insn_config;
184 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
185 * allocated for the primary 8259, so we don't need to allocate them
188 /* configure all ports as input (default) */
194 outb((inb(CSCDR) & 0xAA), CSCDR);
196 dev_info(dev->class_dev, "%s: attached\n", dev->board_name);
200 static void dnp_detach(struct comedi_device *dev)
207 outb((inb(CSCDR) & 0xAA), CSCDR);
210 static struct comedi_driver dnp_driver = {
211 .driver_name = "dnp-1486",
212 .module = THIS_MODULE,
213 .attach = dnp_attach,
214 .detach = dnp_detach,
216 module_comedi_driver(dnp_driver);
218 MODULE_AUTHOR("Comedi http://www.comedi.org");
219 MODULE_DESCRIPTION("Comedi low-level driver");
220 MODULE_LICENSE("GPL");