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.
20 * Description: Data Translation DT2814
23 * Devices: [Data Translation] DT2814 (dt2814)
25 * Configuration options:
26 * [0] - I/O port base address
29 * This card has 16 analog inputs multiplexed onto a 12 bit ADC. There
30 * is a minimally useful onboard clock. The base frequency for the
31 * clock is selected by jumpers, and the clock divider can be selected
32 * via programmed I/O. Unfortunately, the clock divider can only be
33 * a power of 10, from 1 to 10^7, of which only 3 or 4 are useful. In
34 * addition, the clock does not seem to be very accurate.
37 #include <linux/module.h>
38 #include <linux/interrupt.h>
39 #include "../comedidev.h"
41 #include <linux/delay.h>
50 #define DT2814_FINISH 0x80
51 #define DT2814_ERR 0x40
52 #define DT2814_BUSY 0x20
53 #define DT2814_ENB 0x10
54 #define DT2814_CHANMASK 0x0f
56 struct dt2814_private {
61 #define DT2814_TIMEOUT 10
62 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
64 static int dt2814_ai_eoc(struct comedi_device *dev,
65 struct comedi_subdevice *s,
66 struct comedi_insn *insn,
67 unsigned long context)
71 status = inb(dev->iobase + DT2814_CSR);
72 if (status & DT2814_FINISH)
77 static int dt2814_ai_insn_read(struct comedi_device *dev,
78 struct comedi_subdevice *s,
79 struct comedi_insn *insn, unsigned int *data)
85 for (n = 0; n < insn->n; n++) {
86 chan = CR_CHAN(insn->chanspec);
88 outb(chan, dev->iobase + DT2814_CSR);
90 ret = comedi_timeout(dev, s, insn, dt2814_ai_eoc, 0);
94 hi = inb(dev->iobase + DT2814_DATA);
95 lo = inb(dev->iobase + DT2814_DATA);
97 data[n] = (hi << 4) | (lo >> 4);
103 static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
108 /* XXX ignores flags */
111 for (i = 0; i < 8; i++) {
112 if ((2 * (*ns)) < (f * 11))
122 static int dt2814_ai_cmdtest(struct comedi_device *dev,
123 struct comedi_subdevice *s, struct comedi_cmd *cmd)
128 /* Step 1 : check if triggers are trivially valid */
130 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
131 err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
132 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
133 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
134 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
139 /* Step 2a : make sure trigger sources are unique */
141 err |= comedi_check_trigger_is_unique(cmd->stop_src);
143 /* Step 2b : and mutually compatible */
148 /* Step 3: check if arguments are trivially valid */
150 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
152 err |= comedi_check_trigger_arg_max(&cmd->scan_begin_arg, 1000000000);
153 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
156 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
159 if (cmd->stop_src == TRIG_COUNT)
160 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 2);
162 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
167 /* step 4: fix up any arguments */
169 arg = cmd->scan_begin_arg;
170 dt2814_ns_to_timer(&arg, cmd->flags);
171 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
179 static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
181 struct dt2814_private *devpriv = dev->private;
182 struct comedi_cmd *cmd = &s->async->cmd;
186 trigvar = dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags);
188 chan = CR_CHAN(cmd->chanlist[0]);
190 devpriv->ntrig = cmd->stop_arg;
191 outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
196 static irqreturn_t dt2814_interrupt(int irq, void *d)
199 struct comedi_device *dev = d;
200 struct dt2814_private *devpriv = dev->private;
201 struct comedi_subdevice *s = dev->read_subdev;
204 if (!dev->attached) {
205 dev_err(dev->class_dev, "spurious interrupt\n");
209 hi = inb(dev->iobase + DT2814_DATA);
210 lo = inb(dev->iobase + DT2814_DATA);
212 data = (hi << 4) | (lo >> 4);
214 if (!(--devpriv->ntrig)) {
217 outb(0, dev->iobase + DT2814_CSR);
219 * note: turning off timed mode triggers another
223 for (i = 0; i < DT2814_TIMEOUT; i++) {
224 if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
227 inb(dev->iobase + DT2814_DATA);
228 inb(dev->iobase + DT2814_DATA);
230 s->async->events |= COMEDI_CB_EOA;
232 comedi_handle_events(dev, s);
236 static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
238 struct dt2814_private *devpriv;
239 struct comedi_subdevice *s;
243 ret = comedi_request_region(dev, it->options[0], 0x2);
247 outb(0, dev->iobase + DT2814_CSR);
249 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
250 dev_err(dev->class_dev, "reset error (fatal)\n");
253 i = inb(dev->iobase + DT2814_DATA);
254 i = inb(dev->iobase + DT2814_DATA);
256 if (it->options[1]) {
257 ret = request_irq(it->options[1], dt2814_interrupt, 0,
258 dev->board_name, dev);
260 dev->irq = it->options[1];
263 ret = comedi_alloc_subdevices(dev, 1);
267 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
271 s = &dev->subdevices[0];
272 s->type = COMEDI_SUBD_AI;
273 s->subdev_flags = SDF_READABLE | SDF_GROUND;
274 s->n_chan = 16; /* XXX */
275 s->insn_read = dt2814_ai_insn_read;
277 s->range_table = &range_unknown; /* XXX */
279 dev->read_subdev = s;
280 s->subdev_flags |= SDF_CMD_READ;
282 s->do_cmd = dt2814_ai_cmd;
283 s->do_cmdtest = dt2814_ai_cmdtest;
289 static struct comedi_driver dt2814_driver = {
290 .driver_name = "dt2814",
291 .module = THIS_MODULE,
292 .attach = dt2814_attach,
293 .detach = comedi_legacy_detach,
295 module_comedi_driver(dt2814_driver);
297 MODULE_AUTHOR("Comedi http://www.comedi.org");
298 MODULE_DESCRIPTION("Comedi low-level driver");
299 MODULE_LICENSE("GPL");