2 comedi/drivers/dt2814.c
3 Hardware driver for Data Translation DT2814
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1998 David A. Schleef <ds@schleef.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 Description: Data Translation DT2814
28 Devices: [Data Translation] DT2814 (dt2814)
30 Configuration options:
31 [0] - I/O port base address
34 This card has 16 analog inputs multiplexed onto a 12 bit ADC. There
35 is a minimally useful onboard clock. The base frequency for the
36 clock is selected by jumpers, and the clock divider can be selected
37 via programmed I/O. Unfortunately, the clock divider can only be
38 a power of 10, from 1 to 10^7, of which only 3 or 4 are useful. In
39 addition, the clock does not seem to be very accurate.
42 #include <linux/interrupt.h>
43 #include "../comedidev.h"
45 #include <linux/ioport.h>
46 #include <linux/delay.h>
48 #include "comedi_fc.h"
59 #define DT2814_FINISH 0x80
60 #define DT2814_ERR 0x40
61 #define DT2814_BUSY 0x20
62 #define DT2814_ENB 0x10
63 #define DT2814_CHANMASK 0x0f
65 struct dt2814_private
{
71 #define devpriv ((struct dt2814_private *)dev->private)
73 #define DT2814_TIMEOUT 10
74 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
76 static int dt2814_ai_insn_read(struct comedi_device
*dev
,
77 struct comedi_subdevice
*s
,
78 struct comedi_insn
*insn
, unsigned int *data
)
84 for (n
= 0; n
< insn
->n
; n
++) {
85 chan
= CR_CHAN(insn
->chanspec
);
87 outb(chan
, dev
->iobase
+ DT2814_CSR
);
88 for (i
= 0; i
< DT2814_TIMEOUT
; i
++) {
89 status
= inb(dev
->iobase
+ DT2814_CSR
);
90 printk(KERN_INFO
"dt2814: status: %02x\n", status
);
92 if (status
& DT2814_FINISH
)
95 if (i
>= DT2814_TIMEOUT
) {
96 printk(KERN_INFO
"dt2814: status: %02x\n", status
);
100 hi
= inb(dev
->iobase
+ DT2814_DATA
);
101 lo
= inb(dev
->iobase
+ DT2814_DATA
);
103 data
[n
] = (hi
<< 4) | (lo
>> 4);
109 static int dt2814_ns_to_timer(unsigned int *ns
, unsigned int flags
)
114 /* XXX ignores flags */
117 for (i
= 0; i
< 8; i
++) {
118 if ((2 * (*ns
)) < (f
* 11))
128 static int dt2814_ai_cmdtest(struct comedi_device
*dev
,
129 struct comedi_subdevice
*s
, struct comedi_cmd
*cmd
)
134 /* Step 1 : check if triggers are trivially valid */
136 err
|= cfc_check_trigger_src(&cmd
->start_src
, TRIG_NOW
);
137 err
|= cfc_check_trigger_src(&cmd
->scan_begin_src
, TRIG_TIMER
);
138 err
|= cfc_check_trigger_src(&cmd
->convert_src
, TRIG_NOW
);
139 err
|= cfc_check_trigger_src(&cmd
->scan_end_src
, TRIG_COUNT
);
140 err
|= cfc_check_trigger_src(&cmd
->stop_src
, TRIG_COUNT
| TRIG_NONE
);
145 /* Step 2a : make sure trigger sources are unique */
147 err
|= cfc_check_trigger_is_unique(cmd
->stop_src
);
149 /* Step 2b : and mutually compatible */
154 /* step 3: make sure arguments are trivially compatible */
156 if (cmd
->start_arg
!= 0) {
160 if (cmd
->scan_begin_arg
> 1000000000) {
161 cmd
->scan_begin_arg
= 1000000000;
164 if (cmd
->scan_begin_arg
< DT2814_MAX_SPEED
) {
165 cmd
->scan_begin_arg
= DT2814_MAX_SPEED
;
168 if (cmd
->scan_end_arg
!= cmd
->chanlist_len
) {
169 cmd
->scan_end_arg
= cmd
->chanlist_len
;
172 if (cmd
->stop_src
== TRIG_COUNT
) {
173 if (cmd
->stop_arg
< 2) {
179 if (cmd
->stop_arg
!= 0) {
188 /* step 4: fix up any arguments */
190 tmp
= cmd
->scan_begin_arg
;
191 dt2814_ns_to_timer(&cmd
->scan_begin_arg
, cmd
->flags
& TRIG_ROUND_MASK
);
192 if (tmp
!= cmd
->scan_begin_arg
)
201 static int dt2814_ai_cmd(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
203 struct comedi_cmd
*cmd
= &s
->async
->cmd
;
208 dt2814_ns_to_timer(&cmd
->scan_begin_arg
,
209 cmd
->flags
& TRIG_ROUND_MASK
);
211 chan
= CR_CHAN(cmd
->chanlist
[0]);
213 devpriv
->ntrig
= cmd
->stop_arg
;
214 outb(chan
| DT2814_ENB
| (trigvar
<< 5), dev
->iobase
+ DT2814_CSR
);
220 static irqreturn_t
dt2814_interrupt(int irq
, void *d
)
223 struct comedi_device
*dev
= d
;
224 struct comedi_subdevice
*s
;
227 if (!dev
->attached
) {
228 comedi_error(dev
, "spurious interrupt");
232 s
= &dev
->subdevices
[0];
234 hi
= inb(dev
->iobase
+ DT2814_DATA
);
235 lo
= inb(dev
->iobase
+ DT2814_DATA
);
237 data
= (hi
<< 4) | (lo
>> 4);
239 if (!(--devpriv
->ntrig
)) {
242 outb(0, dev
->iobase
+ DT2814_CSR
);
243 /* note: turning off timed mode triggers another
246 for (i
= 0; i
< DT2814_TIMEOUT
; i
++) {
247 if (inb(dev
->iobase
+ DT2814_CSR
) & DT2814_FINISH
)
250 inb(dev
->iobase
+ DT2814_DATA
);
251 inb(dev
->iobase
+ DT2814_DATA
);
253 s
->async
->events
|= COMEDI_CB_EOA
;
255 comedi_event(dev
, s
);
259 static int dt2814_attach(struct comedi_device
*dev
, struct comedi_devconfig
*it
)
263 struct comedi_subdevice
*s
;
264 unsigned long iobase
;
266 iobase
= it
->options
[0];
267 printk(KERN_INFO
"comedi%d: dt2814: 0x%04lx ", dev
->minor
, iobase
);
268 if (!request_region(iobase
, DT2814_SIZE
, "dt2814")) {
269 printk(KERN_ERR
"I/O port conflict\n");
272 dev
->iobase
= iobase
;
273 dev
->board_name
= "dt2814";
275 outb(0, dev
->iobase
+ DT2814_CSR
);
277 if (inb(dev
->iobase
+ DT2814_CSR
) & DT2814_ERR
) {
278 printk(KERN_ERR
"reset error (fatal)\n");
281 i
= inb(dev
->iobase
+ DT2814_DATA
);
282 i
= inb(dev
->iobase
+ DT2814_DATA
);
284 irq
= it
->options
[1];
289 irqs
= probe_irq_on();
291 outb(0, dev
->iobase
+ DT2814_CSR
);
295 irq
= probe_irq_off(irqs
);
296 restore_flags(flags
);
297 if (inb(dev
->iobase
+ DT2814_CSR
) & DT2814_ERR
)
298 printk(KERN_DEBUG
"error probing irq (bad)\n");
301 i
= inb(dev
->iobase
+ DT2814_DATA
);
302 i
= inb(dev
->iobase
+ DT2814_DATA
);
307 if (request_irq(irq
, dt2814_interrupt
, 0, "dt2814", dev
)) {
308 printk(KERN_WARNING
"(irq %d unavailable)\n", irq
);
310 printk(KERN_INFO
"( irq = %d )\n", irq
);
313 } else if (irq
== 0) {
314 printk(KERN_WARNING
"(no irq)\n");
317 printk(KERN_DEBUG
"(probe returned multiple irqs--bad)\n");
319 printk(KERN_WARNING
"(irq probe not implemented)\n");
323 ret
= comedi_alloc_subdevices(dev
, 1);
327 ret
= alloc_private(dev
, sizeof(struct dt2814_private
));
331 s
= &dev
->subdevices
[0];
332 dev
->read_subdev
= s
;
333 s
->type
= COMEDI_SUBD_AI
;
334 s
->subdev_flags
= SDF_READABLE
| SDF_GROUND
| SDF_CMD_READ
;
335 s
->n_chan
= 16; /* XXX */
337 s
->insn_read
= dt2814_ai_insn_read
;
338 s
->do_cmd
= dt2814_ai_cmd
;
339 s
->do_cmdtest
= dt2814_ai_cmdtest
;
341 s
->range_table
= &range_unknown
; /* XXX */
346 static void dt2814_detach(struct comedi_device
*dev
)
349 free_irq(dev
->irq
, dev
);
351 release_region(dev
->iobase
, DT2814_SIZE
);
354 static struct comedi_driver dt2814_driver
= {
355 .driver_name
= "dt2814",
356 .module
= THIS_MODULE
,
357 .attach
= dt2814_attach
,
358 .detach
= dt2814_detach
,
360 module_comedi_driver(dt2814_driver
);
362 MODULE_AUTHOR("Comedi http://www.comedi.org");
363 MODULE_DESCRIPTION("Comedi low-level driver");
364 MODULE_LICENSE("GPL");