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 "../comedidev.h"
44 #include <linux/ioport.h>
45 #include <linux/delay.h>
56 #define DT2814_FINISH 0x80
57 #define DT2814_ERR 0x40
58 #define DT2814_BUSY 0x20
59 #define DT2814_ENB 0x10
60 #define DT2814_CHANMASK 0x0f
62 static int dt2814_attach(struct comedi_device * dev, struct comedi_devconfig * it);
63 static int dt2814_detach(struct comedi_device * dev);
64 static struct comedi_driver driver_dt2814 = {
71 COMEDI_INITCLEANUP(driver_dt2814);
73 static irqreturn_t dt2814_interrupt(int irq, void *dev PT_REGS_ARG);
75 struct dt2814_private {
81 #define devpriv ((struct dt2814_private *)dev->private)
83 #define DT2814_TIMEOUT 10
84 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
86 static int dt2814_ai_insn_read(struct comedi_device * dev, struct comedi_subdevice * s,
87 struct comedi_insn * insn, unsigned int * data)
93 for (n = 0; n < insn->n; n++) {
94 chan = CR_CHAN(insn->chanspec);
96 outb(chan, dev->iobase + DT2814_CSR);
97 for (i = 0; i < DT2814_TIMEOUT; i++) {
98 status = inb(dev->iobase + DT2814_CSR);
99 printk("dt2814: status: %02x\n", status);
101 if (status & DT2814_FINISH)
104 if (i >= DT2814_TIMEOUT) {
105 printk("dt2814: status: %02x\n", status);
109 hi = inb(dev->iobase + DT2814_DATA);
110 lo = inb(dev->iobase + DT2814_DATA);
112 data[n] = (hi << 4) | (lo >> 4);
118 static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
123 /* XXX ignores flags */
126 for (i = 0; i < 8; i++) {
127 if ((2 * (*ns)) < (f * 11))
137 static int dt2814_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
138 struct comedi_cmd * cmd)
143 /* step 1: make sure trigger sources are trivially valid */
145 tmp = cmd->start_src;
146 cmd->start_src &= TRIG_NOW;
147 if (!cmd->start_src || tmp != cmd->start_src)
150 tmp = cmd->scan_begin_src;
151 cmd->scan_begin_src &= TRIG_TIMER;
152 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
155 tmp = cmd->convert_src;
156 cmd->convert_src &= TRIG_NOW;
157 if (!cmd->convert_src || tmp != cmd->convert_src)
160 tmp = cmd->scan_end_src;
161 cmd->scan_end_src &= TRIG_COUNT;
162 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
166 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
167 if (!cmd->stop_src || tmp != cmd->stop_src)
173 /* step 2: make sure trigger sources are unique and mutually compatible */
175 /* note that mutual compatiblity is not an issue here */
176 if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
182 /* step 3: make sure arguments are trivially compatible */
184 if (cmd->start_arg != 0) {
188 if (cmd->scan_begin_arg > 1000000000) {
189 cmd->scan_begin_arg = 1000000000;
192 if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
193 cmd->scan_begin_arg = DT2814_MAX_SPEED;
196 if (cmd->scan_end_arg != cmd->chanlist_len) {
197 cmd->scan_end_arg = cmd->chanlist_len;
200 if (cmd->stop_src == TRIG_COUNT) {
201 if (cmd->stop_arg < 2) {
207 if (cmd->stop_arg != 0) {
216 /* step 4: fix up any arguments */
218 tmp = cmd->scan_begin_arg;
219 dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
220 if (tmp != cmd->scan_begin_arg)
229 static int dt2814_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
231 struct comedi_cmd *cmd = &s->async->cmd;
236 dt2814_ns_to_timer(&cmd->scan_begin_arg,
237 cmd->flags & TRIG_ROUND_MASK);
239 chan = CR_CHAN(cmd->chanlist[0]);
241 devpriv->ntrig = cmd->stop_arg;
242 outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
248 static int dt2814_attach(struct comedi_device * dev, struct comedi_devconfig * it)
252 struct comedi_subdevice *s;
253 unsigned long iobase;
255 iobase = it->options[0];
256 printk("comedi%d: dt2814: 0x%04lx ", dev->minor, iobase);
257 if (!request_region(iobase, DT2814_SIZE, "dt2814")) {
258 printk("I/O port conflict\n");
261 dev->iobase = iobase;
262 dev->board_name = "dt2814";
264 outb(0, dev->iobase + DT2814_CSR);
266 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
267 printk("reset error (fatal)\n");
270 i = inb(dev->iobase + DT2814_DATA);
271 i = inb(dev->iobase + DT2814_DATA);
273 irq = it->options[1];
278 irqs = probe_irq_on();
280 outb(0, dev->iobase + DT2814_CSR);
284 irq = probe_irq_off(irqs);
285 restore_flags(flags);
286 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
287 printk("error probing irq (bad) \n");
290 i = inb(dev->iobase + DT2814_DATA);
291 i = inb(dev->iobase + DT2814_DATA);
296 if (comedi_request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
297 printk("(irq %d unavailable)\n", irq);
299 printk("( irq = %d )\n", irq);
302 } else if (irq == 0) {
303 printk("(no irq)\n");
306 printk("(probe returned multiple irqs--bad)\n");
308 printk("(irq probe not implemented)\n");
312 if ((ret = alloc_subdevices(dev, 1)) < 0)
314 if ((ret = alloc_private(dev, sizeof(struct dt2814_private))) < 0)
317 s = dev->subdevices + 0;
318 dev->read_subdev = s;
319 s->type = COMEDI_SUBD_AI;
320 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
321 s->n_chan = 16; /* XXX */
323 s->insn_read = dt2814_ai_insn_read;
324 s->do_cmd = dt2814_ai_cmd;
325 s->do_cmdtest = dt2814_ai_cmdtest;
327 s->range_table = &range_unknown; /* XXX */
332 static int dt2814_detach(struct comedi_device * dev)
334 printk("comedi%d: dt2814: remove\n", dev->minor);
337 comedi_free_irq(dev->irq, dev);
340 release_region(dev->iobase, DT2814_SIZE);
346 static irqreturn_t dt2814_interrupt(int irq, void *d PT_REGS_ARG)
349 struct comedi_device *dev = d;
350 struct comedi_subdevice *s;
353 if (!dev->attached) {
354 comedi_error(dev, "spurious interrupt");
358 s = dev->subdevices + 0;
360 hi = inb(dev->iobase + DT2814_DATA);
361 lo = inb(dev->iobase + DT2814_DATA);
363 data = (hi << 4) | (lo >> 4);
365 if (!(--devpriv->ntrig)) {
368 outb(0, dev->iobase + DT2814_CSR);
369 /* note: turning off timed mode triggers another
372 for (i = 0; i < DT2814_TIMEOUT; i++) {
373 if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
376 inb(dev->iobase + DT2814_DATA);
377 inb(dev->iobase + DT2814_DATA);
379 s->async->events |= COMEDI_CB_EOA;
381 comedi_event(dev, s);