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 /* Useful for shorthand access to the particular board structure ----------- */
63 #define thisboard ((const struct dnp_board *)dev->board_ptr)
65 /* This structure is for data unique to the DNP driver --------------------- */
66 struct dnp_private_data {
70 /* Shorthand macro for faster access to the private data ------------------- */
71 #define devpriv ((dnp_private *)dev->private)
73 /* ------------------------------------------------------------------------- */
74 /* The insn_bits interface allows packed reading/writing of DIO channels. */
75 /* The comedi core can convert between insn_bits and insn_read/write, so you */
76 /* are able to use these instructions as well. */
77 /* ------------------------------------------------------------------------- */
79 static int dnp_dio_insn_bits(struct comedi_device *dev,
80 struct comedi_subdevice *s,
81 struct comedi_insn *insn, unsigned int *data)
85 return -EINVAL; /* insn uses data[0] and data[1] */
87 /* The insn data is a mask in data[0] and the new data in data[1], */
88 /* each channel cooresponding to a bit. */
90 /* Ports A and B are straight forward: each bit corresponds to an */
91 /* output pin with the same order. Port C is different: bits 0...3 */
92 /* correspond to bits 4...7 of the output register (PCDR). */
98 & ~(u8) (data[0] & 0x0000FF))
99 | (u8) (data[1] & 0x0000FF), CSCDR);
103 & ~(u8) ((data[0] & 0x00FF00) >> 8))
104 | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
108 & ~(u8) ((data[0] & 0x0F0000) >> 12))
109 | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
112 /* on return, data[1] contains the value of the digital input lines. */
114 data[0] = inb(CSCDR);
116 data[0] += inb(CSCDR) << 8;
118 data[0] += ((inb(CSCDR) & 0xF0) << 12);
124 /* ------------------------------------------------------------------------- */
125 /* Configure the direction of the bidirectional digital i/o pins. chanspec */
126 /* contains the channel to be changed and data[0] contains either */
127 /* COMEDI_INPUT or COMEDI_OUTPUT. */
128 /* ------------------------------------------------------------------------- */
130 static int dnp_dio_insn_config(struct comedi_device *dev,
131 struct comedi_subdevice *s,
132 struct comedi_insn *insn, unsigned int *data)
137 /* reduces chanspec to lower 16 bits */
138 int chan = CR_CHAN(insn->chanspec);
141 case INSN_CONFIG_DIO_OUTPUT:
142 case INSN_CONFIG_DIO_INPUT:
144 case INSN_CONFIG_DIO_QUERY:
146 (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
153 /* Test: which port does the channel belong to? */
155 /* We have to pay attention with port C: this is the meaning of PCMR: */
156 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */
157 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */
159 if ((chan >= 0) && (chan <= 7)) {
162 } else if ((chan >= 8) && (chan <= 15)) {
166 } else if ((chan >= 16) && (chan <= 19)) {
167 /* this is port C; multiplication with 2 brings bits into */
168 /* correct position for PCMR! */
176 /* read 'old' direction of the port and set bits (out=1, in=0) */
177 register_buffer = inb(CSCDR);
178 if (data[0] == COMEDI_OUTPUT)
179 register_buffer |= (1 << chan);
181 register_buffer &= ~(1 << chan);
183 outb(register_buffer, CSCDR);
189 static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
191 struct comedi_subdevice *s;
193 printk(KERN_INFO "comedi%d: dnp: ", dev->minor);
195 /* Autoprobing: this should find out which board we have. Currently */
196 /* only the 1486 board is supported and autoprobing is not */
197 /* implemented :-) */
198 /* dev->board_ptr = dnp_probe(dev); */
200 /* Initialize the name of the board. */
201 /* We can use the "thisboard" macro now. */
202 dev->board_name = thisboard->name;
204 /* Allocate the private structure area. alloc_private() is a */
205 /* convenient macro defined in comedidev.h. */
206 if (alloc_private(dev, sizeof(struct dnp_private_data)) < 0)
209 /* Allocate the subdevice structures. alloc_subdevice() is a */
210 /* convenient macro defined in comedidev.h. */
212 if (alloc_subdevices(dev, 1) < 0)
215 s = dev->subdevices + 0;
216 /* digital i/o subdevice */
217 s->type = COMEDI_SUBD_DIO;
218 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
221 s->range_table = &range_digital;
222 s->insn_bits = dnp_dio_insn_bits;
223 s->insn_config = dnp_dio_insn_config;
225 printk("attached\n");
227 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
228 * allocated for the primary 8259, so we don't need to allocate them
231 /* configure all ports as input (default) */
237 outb((inb(CSCDR) & 0xAA), CSCDR);
242 static void dnp_detach(struct comedi_device *dev)
249 outb((inb(CSCDR) & 0xAA), CSCDR);
252 static const struct dnp_board dnp_boards[] = {
261 static struct comedi_driver dnp_driver = {
262 .driver_name = "ssv_dnp",
263 .module = THIS_MODULE,
264 .attach = dnp_attach,
265 .detach = dnp_detach,
266 .board_name = &dnp_boards[0].name,
267 .offset = sizeof(struct dnp_board),
268 .num_names = ARRAY_SIZE(dnp_boards),
270 module_comedi_driver(dnp_driver);
272 MODULE_AUTHOR("Comedi http://www.comedi.org");
273 MODULE_DESCRIPTION("Comedi low-level driver");
274 MODULE_LICENSE("GPL");