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 /* This data structure holds information about the supported boards -------- */
62 /* ------------------------------------------------------------------------- */
63 /* The insn_bits interface allows packed reading/writing of DIO channels. */
64 /* The comedi core can convert between insn_bits and insn_read/write, so you */
65 /* are able to use these instructions as well. */
66 /* ------------------------------------------------------------------------- */
68 static int dnp_dio_insn_bits(struct comedi_device *dev,
69 struct comedi_subdevice *s,
70 struct comedi_insn *insn, unsigned int *data)
72 /* The insn data is a mask in data[0] and the new data in data[1], */
73 /* each channel cooresponding to a bit. */
75 /* Ports A and B are straight forward: each bit corresponds to an */
76 /* output pin with the same order. Port C is different: bits 0...3 */
77 /* correspond to bits 4...7 of the output register (PCDR). */
83 & ~(u8) (data[0] & 0x0000FF))
84 | (u8) (data[1] & 0x0000FF), CSCDR);
88 & ~(u8) ((data[0] & 0x00FF00) >> 8))
89 | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
93 & ~(u8) ((data[0] & 0x0F0000) >> 12))
94 | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
97 /* on return, data[1] contains the value of the digital input lines. */
101 data[0] += inb(CSCDR) << 8;
103 data[0] += ((inb(CSCDR) & 0xF0) << 12);
109 /* ------------------------------------------------------------------------- */
110 /* Configure the direction of the bidirectional digital i/o pins. chanspec */
111 /* contains the channel to be changed and data[0] contains either */
112 /* COMEDI_INPUT or COMEDI_OUTPUT. */
113 /* ------------------------------------------------------------------------- */
115 static int dnp_dio_insn_config(struct comedi_device *dev,
116 struct comedi_subdevice *s,
117 struct comedi_insn *insn, unsigned int *data)
122 /* reduces chanspec to lower 16 bits */
123 int chan = CR_CHAN(insn->chanspec);
126 case INSN_CONFIG_DIO_OUTPUT:
127 case INSN_CONFIG_DIO_INPUT:
129 case INSN_CONFIG_DIO_QUERY:
131 (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
138 /* Test: which port does the channel belong to? */
140 /* We have to pay attention with port C: this is the meaning of PCMR: */
141 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */
142 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */
144 if ((chan >= 0) && (chan <= 7)) {
147 } else if ((chan >= 8) && (chan <= 15)) {
151 } else if ((chan >= 16) && (chan <= 19)) {
152 /* this is port C; multiplication with 2 brings bits into */
153 /* correct position for PCMR! */
161 /* read 'old' direction of the port and set bits (out=1, in=0) */
162 register_buffer = inb(CSCDR);
163 if (data[0] == COMEDI_OUTPUT)
164 register_buffer |= (1 << chan);
166 register_buffer &= ~(1 << chan);
168 outb(register_buffer, CSCDR);
174 static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
176 const struct dnp_board *board = comedi_board(dev);
177 struct comedi_subdevice *s;
180 printk(KERN_INFO "comedi%d: dnp: ", dev->minor);
182 dev->board_name = board->name;
184 ret = comedi_alloc_subdevices(dev, 1);
188 s = dev->subdevices + 0;
189 /* digital i/o subdevice */
190 s->type = COMEDI_SUBD_DIO;
191 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
194 s->range_table = &range_digital;
195 s->insn_bits = dnp_dio_insn_bits;
196 s->insn_config = dnp_dio_insn_config;
198 printk("attached\n");
200 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
201 * allocated for the primary 8259, so we don't need to allocate them
204 /* configure all ports as input (default) */
210 outb((inb(CSCDR) & 0xAA), CSCDR);
215 static void dnp_detach(struct comedi_device *dev)
222 outb((inb(CSCDR) & 0xAA), CSCDR);
225 static const struct dnp_board dnp_boards[] = {
234 static struct comedi_driver dnp_driver = {
235 .driver_name = "ssv_dnp",
236 .module = THIS_MODULE,
237 .attach = dnp_attach,
238 .detach = dnp_detach,
239 .board_name = &dnp_boards[0].name,
240 .offset = sizeof(struct dnp_board),
241 .num_names = ARRAY_SIZE(dnp_boards),
243 module_comedi_driver(dnp_driver);
245 MODULE_AUTHOR("Comedi http://www.comedi.org");
246 MODULE_DESCRIPTION("Comedi low-level driver");
247 MODULE_LICENSE("GPL");