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 /* We only support one DNP 'board' variant at the moment */
63 static const struct dnp_board dnp_boards[] = {
72 /* Useful for shorthand access to the particular board structure ----------- */
73 #define thisboard ((const struct dnp_board *)dev->board_ptr)
75 /* This structure is for data unique to the DNP driver --------------------- */
76 struct dnp_private_data {
80 /* Shorthand macro for faster access to the private data ------------------- */
81 #define devpriv ((dnp_private *)dev->private)
83 /* ------------------------------------------------------------------------- */
84 /* The struct comedi_driver structure tells the Comedi core module which */
85 /* functions to call to configure/deconfigure (attach/detach) the board, and */
86 /* also about the kernel module that contains the device code. */
88 /* In the following section we define the API of this driver. */
89 /* ------------------------------------------------------------------------- */
91 static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it);
92 static int dnp_detach(struct comedi_device *dev);
94 static struct comedi_driver driver_dnp = {
95 .driver_name = "ssv_dnp",
96 .module = THIS_MODULE,
99 .board_name = &dnp_boards[0].name,
100 /* only necessary for non-PnP devs */
101 .offset = sizeof(struct dnp_board), /* like ISA-PnP, PCI or PCMCIA */
102 .num_names = ARRAY_SIZE(dnp_boards),
105 COMEDI_INITCLEANUP(driver_dnp);
107 static int dnp_dio_insn_bits(struct comedi_device *dev,
108 struct comedi_subdevice *s,
109 struct comedi_insn *insn, unsigned int *data);
111 static int dnp_dio_insn_config(struct comedi_device *dev,
112 struct comedi_subdevice *s,
113 struct comedi_insn *insn, unsigned int *data);
115 /* ------------------------------------------------------------------------- */
116 /* Attach is called by comedi core to configure the driver for a particular */
117 /* board. If you specified a board_name array in the driver structure, */
118 /* dev->board_ptr contains that address. */
119 /* ------------------------------------------------------------------------- */
121 static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
124 struct comedi_subdevice *s;
126 printk(KERN_INFO "comedi%d: dnp: ", dev->minor);
128 /* Autoprobing: this should find out which board we have. Currently */
129 /* only the 1486 board is supported and autoprobing is not */
130 /* implemented :-) */
131 /* dev->board_ptr = dnp_probe(dev); */
133 /* Initialize the name of the board. */
134 /* We can use the "thisboard" macro now. */
135 dev->board_name = thisboard->name;
137 /* Allocate the private structure area. alloc_private() is a */
138 /* convenient macro defined in comedidev.h. */
139 if (alloc_private(dev, sizeof(struct dnp_private_data)) < 0)
142 /* Allocate the subdevice structures. alloc_subdevice() is a */
143 /* convenient macro defined in comedidev.h. */
145 if (alloc_subdevices(dev, 1) < 0)
148 s = dev->subdevices + 0;
149 /* digital i/o subdevice */
150 s->type = COMEDI_SUBD_DIO;
151 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
154 s->range_table = &range_digital;
155 s->insn_bits = dnp_dio_insn_bits;
156 s->insn_config = dnp_dio_insn_config;
158 printk("attached\n");
160 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
161 * allocated for the primary 8259, so we don't need to allocate them
164 /* configure all ports as input (default) */
170 outb((inb(CSCDR) & 0xAA), CSCDR);
176 /* ------------------------------------------------------------------------- */
177 /* detach is called to deconfigure a device. It should deallocate the */
178 /* resources. This function is also called when _attach() fails, so it */
179 /* should be careful not to release resources that were not necessarily */
180 /* allocated by _attach(). dev->private and dev->subdevices are */
181 /* deallocated automatically by the core. */
182 /* ------------------------------------------------------------------------- */
184 static int dnp_detach(struct comedi_device *dev)
187 /* configure all ports as input (default) */
193 outb((inb(CSCDR) & 0xAA), CSCDR);
195 /* announce that we are finished */
196 printk(KERN_INFO "comedi%d: dnp: remove\n", dev->minor);
202 /* ------------------------------------------------------------------------- */
203 /* The insn_bits interface allows packed reading/writing of DIO channels. */
204 /* The comedi core can convert between insn_bits and insn_read/write, so you */
205 /* are able to use these instructions as well. */
206 /* ------------------------------------------------------------------------- */
208 static int dnp_dio_insn_bits(struct comedi_device *dev,
209 struct comedi_subdevice *s,
210 struct comedi_insn *insn, unsigned int *data)
214 return -EINVAL; /* insn uses data[0] and data[1] */
216 /* The insn data is a mask in data[0] and the new data in data[1], */
217 /* each channel cooresponding to a bit. */
219 /* Ports A and B are straight forward: each bit corresponds to an */
220 /* output pin with the same order. Port C is different: bits 0...3 */
221 /* correspond to bits 4...7 of the output register (PCDR). */
227 & ~(u8) (data[0] & 0x0000FF))
228 | (u8) (data[1] & 0x0000FF), CSCDR);
232 & ~(u8) ((data[0] & 0x00FF00) >> 8))
233 | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
237 & ~(u8) ((data[0] & 0x0F0000) >> 12))
238 | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
241 /* on return, data[1] contains the value of the digital input lines. */
243 data[0] = inb(CSCDR);
245 data[0] += inb(CSCDR) << 8;
247 data[0] += ((inb(CSCDR) & 0xF0) << 12);
253 /* ------------------------------------------------------------------------- */
254 /* Configure the direction of the bidirectional digital i/o pins. chanspec */
255 /* contains the channel to be changed and data[0] contains either */
256 /* COMEDI_INPUT or COMEDI_OUTPUT. */
257 /* ------------------------------------------------------------------------- */
259 static int dnp_dio_insn_config(struct comedi_device *dev,
260 struct comedi_subdevice *s,
261 struct comedi_insn *insn, unsigned int *data)
266 /* reduces chanspec to lower 16 bits */
267 int chan = CR_CHAN(insn->chanspec);
270 case INSN_CONFIG_DIO_OUTPUT:
271 case INSN_CONFIG_DIO_INPUT:
273 case INSN_CONFIG_DIO_QUERY:
275 (inb(CSCDR) & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
282 /* Test: which port does the channel belong to? */
284 /* We have to pay attention with port C: this is the meaning of PCMR: */
285 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */
286 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */
288 if ((chan >= 0) && (chan <= 7)) {
291 } else if ((chan >= 8) && (chan <= 15)) {
295 } else if ((chan >= 16) && (chan <= 19)) {
296 /* this is port C; multiplication with 2 brings bits into */
297 /* correct position for PCMR! */
305 /* read 'old' direction of the port and set bits (out=1, in=0) */
306 register_buffer = inb(CSCDR);
307 if (data[0] == COMEDI_OUTPUT)
308 register_buffer |= (1 << chan);
310 register_buffer &= ~(1 << chan);
312 outb(register_buffer, CSCDR);