2 Some comments on the code..
4 - it shouldn't be necessary to use outb_p().
6 - ignoreirq creates a race condition. It needs to be fixed.
11 comedi/drivers/das6402.c
12 An experimental driver for Computerboards' DAS6402 I/O card
14 Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.org>
16 This program is free software; you can redistribute it and/or modify
17 it under the terms of the GNU General Public License as published by
18 the Free Software Foundation; either version 2 of the License, or
19 (at your option) any later version.
21 This program is distributed in the hope that it will be useful,
22 but WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 GNU General Public License for more details.
26 You should have received a copy of the GNU General Public License
27 along with this program; if not, write to the Free Software
28 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33 Description: Keithley Metrabyte DAS6402 (& compatibles)
34 Author: Oystein Svendsen <svendsen@pvv.org>
36 Devices: [Keithley Metrabyte] DAS6402 (das6402)
38 This driver has suffered bitrot.
41 #include <linux/interrupt.h>
42 #include "../comedidev.h"
44 #include <linux/ioport.h>
46 #define DAS6402_SIZE 16
48 #define N_WORDS (3000*64)
54 #define BYTE unsigned char
55 #define WORD unsigned short
57 /*----- register 8 ----*/
62 #define ARMED 0x20 /* enable conting of post sample conv */
64 #define MHZ 0x80 /* 10 MHz clock */
65 /*---------------------*/
67 /*----- register 9 ----*/
68 #define IRQ (0x04 << 4) /* these two are */
69 #define IRQV 10 /* dependent on each other */
71 #define CONVSRC 0x03 /* trig src is Intarnal pacer */
72 #define BURSTEN 0x04 /* enable burst */
73 #define XINTE 0x08 /* use external int. trig */
74 #define INTE 0x80 /* enable analog interrupts */
75 /*---------------------*/
77 /*----- register 10 ---*/
78 #define TGEN 0x01 /* Use pin DI1 for externl trigging? */
79 #define TGSEL 0x02 /* Use edge triggering */
80 #define TGPOL 0x04 /* active edge is falling */
81 #define PRETRIG 0x08 /* pretrig */
82 /*---------------------*/
84 /*----- register 11 ---*/
86 #define FIFOHFULL 0x08
88 #define FIFONEPTY 0x04
92 /*---------------------*/
102 struct das6402_private {
103 int ai_bytes_to_read;
105 int das6402_ignoreirq;
107 #define devpriv ((struct das6402_private *)dev->private)
109 static void das6402_ai_fifo_dregs(struct comedi_device *dev,
110 struct comedi_subdevice *s)
113 if (!(inb(dev->iobase + 8) & 0x01))
115 comedi_buf_put(s->async, inw(dev->iobase));
119 static void das6402_setcounter(struct comedi_device *dev)
122 unsigned short ctrlwrd;
124 /* set up counter0 first, mode 0 */
126 outb_p(p, dev->iobase + 15);
128 p = (BYTE) (0xff & ctrlwrd);
129 outb_p(p, dev->iobase + 12);
130 p = (BYTE) (0xff & (ctrlwrd >> 8));
131 outb_p(p, dev->iobase + 12);
133 /* set up counter1, mode 2 */
135 outb_p(p, dev->iobase + 15);
137 p = (BYTE) (0xff & ctrlwrd);
138 outb_p(p, dev->iobase + 13);
139 p = (BYTE) (0xff & (ctrlwrd >> 8));
140 outb_p(p, dev->iobase + 13);
142 /* set up counter1, mode 2 */
144 outb_p(p, dev->iobase + 15);
146 p = (BYTE) (0xff & ctrlwrd);
147 outb_p(p, dev->iobase + 14);
148 p = (BYTE) (0xff & (ctrlwrd >> 8));
149 outb_p(p, dev->iobase + 14);
152 static irqreturn_t intr_handler(int irq, void *d)
154 struct comedi_device *dev = d;
155 struct comedi_subdevice *s = dev->subdevices;
157 if (!dev->attached || devpriv->das6402_ignoreirq) {
158 dev_warn(dev->class_dev, "BUG: spurious interrupt\n");
162 printk("das6402: interrupt! das6402_irqcount=%i\n",
163 devpriv->das6402_irqcount);
164 printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
167 das6402_ai_fifo_dregs(dev, s);
169 if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
170 outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
171 outb(0x07, dev->iobase + 8); /* clears all flip-flops */
173 printk("das6402: Got %i samples\n\n",
174 devpriv->das6402_wordsread - diff);
176 s->async->events |= COMEDI_CB_EOA;
177 comedi_event(dev, s);
180 outb(0x01, dev->iobase + 8); /* clear only the interrupt flip-flop */
182 comedi_event(dev, s);
187 static void das6402_ai_fifo_read(struct comedi_device *dev, short *data, int n)
191 for (i = 0; i < n; i++)
192 data[i] = inw(dev->iobase);
196 static int das6402_ai_cancel(struct comedi_device *dev,
197 struct comedi_subdevice *s)
200 * This function should reset the board from whatever condition it
201 * is in (i.e., acquiring data), to a non-active state.
204 devpriv->das6402_ignoreirq = 1;
205 dev_dbg(dev->class_dev, "Stopping acquisition\n");
206 devpriv->das6402_ignoreirq = 1;
207 outb_p(0x02, dev->iobase + 10); /* disable external trigging */
208 outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
209 outb_p(0, dev->iobase + 9); /* disables interrupts */
211 outw_p(SCANL, dev->iobase + 2);
217 static int das6402_ai_mode2(struct comedi_device *dev,
218 struct comedi_subdevice *s, comedi_trig * it)
220 devpriv->das6402_ignoreirq = 1;
221 dev_dbg(dev->class_dev, "Starting acquisition\n");
222 outb_p(0x03, dev->iobase + 10); /* enable external trigging */
223 outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
224 outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
226 devpriv->ai_bytes_to_read = it->n * sizeof(short);
228 /* um... ignoreirq is a nasty race condition */
229 devpriv->das6402_ignoreirq = 0;
231 outw_p(SCANL, dev->iobase + 2);
237 static int board_init(struct comedi_device *dev)
241 devpriv->das6402_ignoreirq = 1;
243 outb(0x07, dev->iobase + 8);
246 outb_p(MODE, dev->iobase + 11);
247 b = BIP | SEM | MODE | GAIN | FIFOHFULL;
248 outb_p(b, dev->iobase + 11);
251 outb_p(EXTEND, dev->iobase + 8);
253 outb_p(b, dev->iobase + 8);
254 b = MHZ | CLRINT | CLRXTR | CLRXIN;
255 outb_p(b, dev->iobase + 8);
258 b = IRQ | CONVSRC | BURSTEN | INTE;
259 outb_p(b, dev->iobase + 9);
263 outb_p(b, dev->iobase + 10);
266 outb_p(b, dev->iobase + 8);
268 das6402_setcounter(dev);
270 outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
272 devpriv->das6402_ignoreirq = 0;
277 static int das6402_attach(struct comedi_device *dev,
278 struct comedi_devconfig *it)
281 unsigned long iobase;
283 struct comedi_subdevice *s;
285 dev->board_name = "das6402";
287 iobase = it->options[0];
291 if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
292 dev_err(dev->class_dev, "I/O port conflict\n");
295 dev->iobase = iobase;
297 /* should do a probe here */
299 irq = it->options[0];
300 dev_dbg(dev->class_dev, "( irq = %u )\n", irq);
301 ret = request_irq(irq, intr_handler, 0, "das6402", dev);
306 ret = alloc_private(dev, sizeof(struct das6402_private));
310 ret = comedi_alloc_subdevices(dev, 1);
315 s = dev->subdevices + 0;
316 s->type = COMEDI_SUBD_AI;
317 s->subdev_flags = SDF_READABLE | SDF_GROUND;
319 /* s->trig[2]=das6402_ai_mode2; */
320 s->cancel = das6402_ai_cancel;
321 s->maxdata = (1 << 12) - 1;
322 s->len_chanlist = 16; /* ? */
323 s->range_table = &range_unknown;
330 static void das6402_detach(struct comedi_device *dev)
333 free_irq(dev->irq, dev);
335 release_region(dev->iobase, DAS6402_SIZE);
338 static struct comedi_driver das6402_driver = {
339 .driver_name = "das6402",
340 .module = THIS_MODULE,
341 .attach = das6402_attach,
342 .detach = das6402_detach,
344 module_comedi_driver(das6402_driver)
346 MODULE_AUTHOR("Comedi http://www.comedi.org");
347 MODULE_DESCRIPTION("Comedi low-level driver");
348 MODULE_LICENSE("GPL");