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 DT2814_TIMEOUT 10
72 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
74 static int dt2814_ai_insn_read(struct comedi_device *dev,
75 struct comedi_subdevice *s,
76 struct comedi_insn *insn, unsigned int *data)
82 for (n = 0; n < insn->n; n++) {
83 chan = CR_CHAN(insn->chanspec);
85 outb(chan, dev->iobase + DT2814_CSR);
86 for (i = 0; i < DT2814_TIMEOUT; i++) {
87 status = inb(dev->iobase + DT2814_CSR);
88 printk(KERN_INFO "dt2814: status: %02x\n", status);
90 if (status & DT2814_FINISH)
93 if (i >= DT2814_TIMEOUT) {
94 printk(KERN_INFO "dt2814: status: %02x\n", status);
98 hi = inb(dev->iobase + DT2814_DATA);
99 lo = inb(dev->iobase + DT2814_DATA);
101 data[n] = (hi << 4) | (lo >> 4);
107 static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
112 /* XXX ignores flags */
115 for (i = 0; i < 8; i++) {
116 if ((2 * (*ns)) < (f * 11))
126 static int dt2814_ai_cmdtest(struct comedi_device *dev,
127 struct comedi_subdevice *s, struct comedi_cmd *cmd)
132 /* Step 1 : check if triggers are trivially valid */
134 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
135 err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
136 err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
137 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
138 err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
143 /* Step 2a : make sure trigger sources are unique */
145 err |= cfc_check_trigger_is_unique(cmd->stop_src);
147 /* Step 2b : and mutually compatible */
152 /* Step 3: check if arguments are trivially valid */
154 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
156 err |= cfc_check_trigger_arg_max(&cmd->scan_begin_arg, 1000000000);
157 err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
160 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
162 if (cmd->stop_src == TRIG_COUNT)
163 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 2);
165 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
170 /* step 4: fix up any arguments */
172 tmp = cmd->scan_begin_arg;
173 dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
174 if (tmp != cmd->scan_begin_arg)
183 static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
185 struct dt2814_private *devpriv = dev->private;
186 struct comedi_cmd *cmd = &s->async->cmd;
191 dt2814_ns_to_timer(&cmd->scan_begin_arg,
192 cmd->flags & TRIG_ROUND_MASK);
194 chan = CR_CHAN(cmd->chanlist[0]);
196 devpriv->ntrig = cmd->stop_arg;
197 outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
203 static irqreturn_t dt2814_interrupt(int irq, void *d)
206 struct comedi_device *dev = d;
207 struct dt2814_private *devpriv = dev->private;
208 struct comedi_subdevice *s;
211 if (!dev->attached) {
212 comedi_error(dev, "spurious interrupt");
216 s = &dev->subdevices[0];
218 hi = inb(dev->iobase + DT2814_DATA);
219 lo = inb(dev->iobase + DT2814_DATA);
221 data = (hi << 4) | (lo >> 4);
223 if (!(--devpriv->ntrig)) {
226 outb(0, dev->iobase + DT2814_CSR);
227 /* note: turning off timed mode triggers another
230 for (i = 0; i < DT2814_TIMEOUT; i++) {
231 if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
234 inb(dev->iobase + DT2814_DATA);
235 inb(dev->iobase + DT2814_DATA);
237 s->async->events |= COMEDI_CB_EOA;
239 comedi_event(dev, s);
243 static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
245 struct dt2814_private *devpriv;
248 struct comedi_subdevice *s;
250 ret = comedi_request_region(dev, it->options[0], DT2814_SIZE);
254 outb(0, dev->iobase + DT2814_CSR);
256 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
257 printk(KERN_ERR "reset error (fatal)\n");
260 i = inb(dev->iobase + DT2814_DATA);
261 i = inb(dev->iobase + DT2814_DATA);
263 irq = it->options[1];
268 irqs = probe_irq_on();
270 outb(0, dev->iobase + DT2814_CSR);
274 irq = probe_irq_off(irqs);
275 restore_flags(flags);
276 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR)
277 printk(KERN_DEBUG "error probing irq (bad)\n");
280 i = inb(dev->iobase + DT2814_DATA);
281 i = inb(dev->iobase + DT2814_DATA);
286 if (request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
287 printk(KERN_WARNING "(irq %d unavailable)\n", irq);
289 printk(KERN_INFO "( irq = %d )\n", irq);
292 } else if (irq == 0) {
293 printk(KERN_WARNING "(no irq)\n");
296 printk(KERN_DEBUG "(probe returned multiple irqs--bad)\n");
298 printk(KERN_WARNING "(irq probe not implemented)\n");
302 ret = comedi_alloc_subdevices(dev, 1);
306 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
309 dev->private = devpriv;
311 s = &dev->subdevices[0];
312 dev->read_subdev = s;
313 s->type = COMEDI_SUBD_AI;
314 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
315 s->n_chan = 16; /* XXX */
317 s->insn_read = dt2814_ai_insn_read;
318 s->do_cmd = dt2814_ai_cmd;
319 s->do_cmdtest = dt2814_ai_cmdtest;
321 s->range_table = &range_unknown; /* XXX */
326 static struct comedi_driver dt2814_driver = {
327 .driver_name = "dt2814",
328 .module = THIS_MODULE,
329 .attach = dt2814_attach,
330 .detach = comedi_legacy_detach,
332 module_comedi_driver(dt2814_driver);
334 MODULE_AUTHOR("Comedi http://www.comedi.org");
335 MODULE_DESCRIPTION("Comedi low-level driver");
336 MODULE_LICENSE("GPL");