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 -------- */
55 typedef struct dnp_board_struct {
62 static const dnp_board dnp_boards[] = { /* we only support one DNP 'board' */
63 { /* variant at the moment */
71 /* Useful for shorthand access to the particular board structure ----------- */
72 #define thisboard ((const dnp_board *)dev->board_ptr)
74 /* This structure is for data unique to the DNP driver --------------------- */
79 /* Shorthand macro for faster access to the private data ------------------- */
80 #define devpriv ((dnp_private *)dev->private)
82 /* ------------------------------------------------------------------------- */
83 /* The struct comedi_driver structure tells the Comedi core module which functions */
84 /* to call to configure/deconfigure (attach/detach) the board, and also */
85 /* about the kernel module that contains the device code. */
87 /* In the following section we define the API of this driver. */
88 /* ------------------------------------------------------------------------- */
90 static int dnp_attach(struct comedi_device * dev, comedi_devconfig * it);
91 static int dnp_detach(struct comedi_device * dev);
93 static struct comedi_driver driver_dnp = {
94 driver_name:"ssv_dnp",
98 board_name:&dnp_boards[0].name,
99 /* only necessary for non-PnP devs */
100 offset:sizeof(dnp_board),/* like ISA-PnP, PCI or PCMCIA. */
101 num_names:sizeof(dnp_boards) / sizeof(dnp_board),
104 COMEDI_INITCLEANUP(driver_dnp);
106 static int dnp_dio_insn_bits(struct comedi_device * dev,
107 struct comedi_subdevice * s, comedi_insn * insn, unsigned int * data);
109 static int dnp_dio_insn_config(struct comedi_device * dev,
110 struct comedi_subdevice * s, comedi_insn * insn, unsigned int * data);
112 /* ------------------------------------------------------------------------- */
113 /* Attach is called by comedi core to configure the driver for a particular */
114 /* board. If you specified a board_name array in the driver structure, */
115 /* dev->board_ptr contains that address. */
116 /* ------------------------------------------------------------------------- */
118 static int dnp_attach(struct comedi_device * dev, comedi_devconfig * it)
121 struct comedi_subdevice *s;
123 printk("comedi%d: dnp: ", dev->minor);
125 /* Autoprobing: this should find out which board we have. Currently only */
126 /* the 1486 board is supported and autoprobing is not implemented :-) */
127 //dev->board_ptr = dnp_probe(dev);
129 /* Initialize the name of the board. We can use the "thisboard" macro now. */
130 dev->board_name = thisboard->name;
132 /* Allocate the private structure area. alloc_private() is a convenient */
133 /* macro defined in comedidev.h. */
134 if (alloc_private(dev, sizeof(dnp_private_data)) < 0)
137 /* Allocate the subdevice structures. alloc_subdevice() is a convenient */
138 /* macro defined in comedidev.h. */
140 if (alloc_subdevices(dev, 1) < 0)
143 s = dev->subdevices + 0;
144 /* digital i/o subdevice */
145 s->type = COMEDI_SUBD_DIO;
146 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
149 s->range_table = &range_digital;
150 s->insn_bits = dnp_dio_insn_bits;
151 s->insn_config = dnp_dio_insn_config;
153 printk("attached\n");
155 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
156 * allocated for the primary 8259, so we don't need to allocate them
159 /* configure all ports as input (default) */
165 outb((inb(CSCDR) & 0xAA), CSCDR);
171 /* ------------------------------------------------------------------------- */
172 /* detach is called to deconfigure a device. It should deallocate the */
173 /* resources. This function is also called when _attach() fails, so it */
174 /* should be careful not to release resources that were not necessarily */
175 /* allocated by _attach(). dev->private and dev->subdevices are */
176 /* deallocated automatically by the core. */
177 /* ------------------------------------------------------------------------- */
179 static int dnp_detach(struct comedi_device * dev)
182 /* configure all ports as input (default) */
188 outb((inb(CSCDR) & 0xAA), CSCDR);
190 /* announce that we are finished */
191 printk("comedi%d: dnp: remove\n", dev->minor);
197 /* ------------------------------------------------------------------------- */
198 /* The insn_bits interface allows packed reading/writing of DIO channels. */
199 /* The comedi core can convert between insn_bits and insn_read/write, so you */
200 /* are able to use these instructions as well. */
201 /* ------------------------------------------------------------------------- */
203 static int dnp_dio_insn_bits(struct comedi_device * dev,
204 struct comedi_subdevice * s, comedi_insn * insn, unsigned int * data)
208 return -EINVAL; /* insn uses data[0] and data[1] */
210 /* The insn data is a mask in data[0] and the new data in data[1], each */
211 /* channel cooresponding to a bit. */
213 /* Ports A and B are straight forward: each bit corresponds to an output */
214 /* pin with the same order. Port C is different: bits 0...3 correspond to */
215 /* bits 4...7 of the output register (PCDR). */
221 & ~(u8) (data[0] & 0x0000FF))
222 | (u8) (data[1] & 0x0000FF), CSCDR);
226 & ~(u8) ((data[0] & 0x00FF00) >> 8))
227 | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
231 & ~(u8) ((data[0] & 0x0F0000) >> 12))
232 | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
235 /* on return, data[1] contains the value of the digital input lines. */
237 data[0] = inb(CSCDR);
239 data[0] += inb(CSCDR) << 8;
241 data[0] += ((inb(CSCDR) & 0xF0) << 12);
247 /* ------------------------------------------------------------------------- */
248 /* Configure the direction of the bidirectional digital i/o pins. chanspec */
249 /* contains the channel to be changed and data[0] contains either */
250 /* COMEDI_INPUT or COMEDI_OUTPUT. */
251 /* ------------------------------------------------------------------------- */
253 static int dnp_dio_insn_config(struct comedi_device * dev,
254 struct comedi_subdevice * s, comedi_insn * insn, unsigned int * data)
259 int chan = CR_CHAN(insn->chanspec); /* reduces chanspec to lower 16 bits */
262 case INSN_CONFIG_DIO_OUTPUT:
263 case INSN_CONFIG_DIO_INPUT:
265 case INSN_CONFIG_DIO_QUERY:
267 (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT :
275 /* Test: which port does the channel belong to? */
277 /* We have to pay attention with port C: this is the meaning of PCMR: */
278 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */
279 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */
281 if ((chan >= 0) && (chan <= 7)) {
284 } else if ((chan >= 8) && (chan <= 15)) {
288 } else if ((chan >= 16) && (chan <= 19)) {
289 /* this is port C; multiplication with 2 brings bits into correct */
290 /* position for PCMR! */
298 /* read 'old' direction of the port and set bits (out=1, in=0) */
299 register_buffer = inb(CSCDR);
300 if (data[0] == COMEDI_OUTPUT) {
301 register_buffer |= (1 << chan);
303 register_buffer &= ~(1 << chan);
305 outb(register_buffer, CSCDR);