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 static int __init
driver_dnp_init_module(void)
107 return comedi_driver_register(&driver_dnp
);
110 static void __exit
driver_dnp_cleanup_module(void)
112 comedi_driver_unregister(&driver_dnp
);
115 module_init(driver_dnp_init_module
);
116 module_exit(driver_dnp_cleanup_module
);
118 static int dnp_dio_insn_bits(struct comedi_device
*dev
,
119 struct comedi_subdevice
*s
,
120 struct comedi_insn
*insn
, unsigned int *data
);
122 static int dnp_dio_insn_config(struct comedi_device
*dev
,
123 struct comedi_subdevice
*s
,
124 struct comedi_insn
*insn
, unsigned int *data
);
126 /* ------------------------------------------------------------------------- */
127 /* Attach is called by comedi core to configure the driver for a particular */
128 /* board. If you specified a board_name array in the driver structure, */
129 /* dev->board_ptr contains that address. */
130 /* ------------------------------------------------------------------------- */
132 static int dnp_attach(struct comedi_device
*dev
, struct comedi_devconfig
*it
)
135 struct comedi_subdevice
*s
;
137 printk(KERN_INFO
"comedi%d: dnp: ", dev
->minor
);
139 /* Autoprobing: this should find out which board we have. Currently */
140 /* only the 1486 board is supported and autoprobing is not */
141 /* implemented :-) */
142 /* dev->board_ptr = dnp_probe(dev); */
144 /* Initialize the name of the board. */
145 /* We can use the "thisboard" macro now. */
146 dev
->board_name
= thisboard
->name
;
148 /* Allocate the private structure area. alloc_private() is a */
149 /* convenient macro defined in comedidev.h. */
150 if (alloc_private(dev
, sizeof(struct dnp_private_data
)) < 0)
153 /* Allocate the subdevice structures. alloc_subdevice() is a */
154 /* convenient macro defined in comedidev.h. */
156 if (alloc_subdevices(dev
, 1) < 0)
159 s
= dev
->subdevices
+ 0;
160 /* digital i/o subdevice */
161 s
->type
= COMEDI_SUBD_DIO
;
162 s
->subdev_flags
= SDF_READABLE
| SDF_WRITABLE
;
165 s
->range_table
= &range_digital
;
166 s
->insn_bits
= dnp_dio_insn_bits
;
167 s
->insn_config
= dnp_dio_insn_config
;
169 printk("attached\n");
171 /* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
172 * allocated for the primary 8259, so we don't need to allocate them
175 /* configure all ports as input (default) */
181 outb((inb(CSCDR
) & 0xAA), CSCDR
);
187 /* ------------------------------------------------------------------------- */
188 /* detach is called to deconfigure a device. It should deallocate the */
189 /* resources. This function is also called when _attach() fails, so it */
190 /* should be careful not to release resources that were not necessarily */
191 /* allocated by _attach(). dev->private and dev->subdevices are */
192 /* deallocated automatically by the core. */
193 /* ------------------------------------------------------------------------- */
195 static int dnp_detach(struct comedi_device
*dev
)
198 /* configure all ports as input (default) */
204 outb((inb(CSCDR
) & 0xAA), CSCDR
);
206 /* announce that we are finished */
207 printk(KERN_INFO
"comedi%d: dnp: remove\n", dev
->minor
);
213 /* ------------------------------------------------------------------------- */
214 /* The insn_bits interface allows packed reading/writing of DIO channels. */
215 /* The comedi core can convert between insn_bits and insn_read/write, so you */
216 /* are able to use these instructions as well. */
217 /* ------------------------------------------------------------------------- */
219 static int dnp_dio_insn_bits(struct comedi_device
*dev
,
220 struct comedi_subdevice
*s
,
221 struct comedi_insn
*insn
, unsigned int *data
)
225 return -EINVAL
; /* insn uses data[0] and data[1] */
227 /* The insn data is a mask in data[0] and the new data in data[1], */
228 /* each channel cooresponding to a bit. */
230 /* Ports A and B are straight forward: each bit corresponds to an */
231 /* output pin with the same order. Port C is different: bits 0...3 */
232 /* correspond to bits 4...7 of the output register (PCDR). */
238 & ~(u8
) (data
[0] & 0x0000FF))
239 | (u8
) (data
[1] & 0x0000FF), CSCDR
);
243 & ~(u8
) ((data
[0] & 0x00FF00) >> 8))
244 | (u8
) ((data
[1] & 0x00FF00) >> 8), CSCDR
);
248 & ~(u8
) ((data
[0] & 0x0F0000) >> 12))
249 | (u8
) ((data
[1] & 0x0F0000) >> 12), CSCDR
);
252 /* on return, data[1] contains the value of the digital input lines. */
254 data
[0] = inb(CSCDR
);
256 data
[0] += inb(CSCDR
) << 8;
258 data
[0] += ((inb(CSCDR
) & 0xF0) << 12);
264 /* ------------------------------------------------------------------------- */
265 /* Configure the direction of the bidirectional digital i/o pins. chanspec */
266 /* contains the channel to be changed and data[0] contains either */
267 /* COMEDI_INPUT or COMEDI_OUTPUT. */
268 /* ------------------------------------------------------------------------- */
270 static int dnp_dio_insn_config(struct comedi_device
*dev
,
271 struct comedi_subdevice
*s
,
272 struct comedi_insn
*insn
, unsigned int *data
)
277 /* reduces chanspec to lower 16 bits */
278 int chan
= CR_CHAN(insn
->chanspec
);
281 case INSN_CONFIG_DIO_OUTPUT
:
282 case INSN_CONFIG_DIO_INPUT
:
284 case INSN_CONFIG_DIO_QUERY
:
286 (inb(CSCDR
) & (1 << chan
)) ? COMEDI_OUTPUT
: COMEDI_INPUT
;
293 /* Test: which port does the channel belong to? */
295 /* We have to pay attention with port C: this is the meaning of PCMR: */
296 /* Bit in PCMR: 7 6 5 4 3 2 1 0 */
297 /* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch */
299 if ((chan
>= 0) && (chan
<= 7)) {
302 } else if ((chan
>= 8) && (chan
<= 15)) {
306 } else if ((chan
>= 16) && (chan
<= 19)) {
307 /* this is port C; multiplication with 2 brings bits into */
308 /* correct position for PCMR! */
316 /* read 'old' direction of the port and set bits (out=1, in=0) */
317 register_buffer
= inb(CSCDR
);
318 if (data
[0] == COMEDI_OUTPUT
)
319 register_buffer
|= (1 << chan
);
321 register_buffer
&= ~(1 << chan
);
323 outb(register_buffer
, CSCDR
);
329 MODULE_AUTHOR("Comedi http://www.comedi.org");
330 MODULE_DESCRIPTION("Comedi low-level driver");
331 MODULE_LICENSE("GPL");