dt2814.c revision 68c3dbff9fc9f25872408d0e95980d41733d48d0 
1/*
2    comedi/drivers/dt2814.c
3    Hardware driver for Data Translation DT2814
4
5    COMEDI - Linux Control and Measurement Device Interface
6    Copyright (C) 1998 David A. Schleef <ds@schleef.org>
7
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.
12
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.
17
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.
21
22*/
23/*
24Driver: dt2814
25Description: Data Translation DT2814
26Author: ds
27Status: complete
28Devices: [Data Translation] DT2814 (dt2814)
29
30Configuration options:
31  [0] - I/O port base address
32  [1] - IRQ
33
34This card has 16 analog inputs multiplexed onto a 12 bit ADC.  There
35is a minimally useful onboard clock.  The base frequency for the
36clock is selected by jumpers, and the clock divider can be selected
37via programmed I/O.  Unfortunately, the clock divider can only be
38a power of 10, from 1 to 10^7, of which only 3 or 4 are useful.  In
39addition, the clock does not seem to be very accurate.
40*/
41
42#include "../comedidev.h"
43
44#include <linux/ioport.h>
45#include <linux/delay.h>
46
47#define DT2814_SIZE 2
48
49#define DT2814_CSR 0
50#define DT2814_DATA 1
51
52/*
53 * flags
54 */
55
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
61
62static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it);
63static int dt2814_detach(struct comedi_device *dev);
64static struct comedi_driver driver_dt2814 = {
65	.driver_name = "dt2814",
66	.module = THIS_MODULE,
67	.attach = dt2814_attach,
68	.detach = dt2814_detach,
69};
70
71COMEDI_INITCLEANUP(driver_dt2814);
72
73static irqreturn_t dt2814_interrupt(int irq, void *dev);
74
75struct dt2814_private {
76
77	int ntrig;
78	int curadchan;
79};
80
81#define devpriv ((struct dt2814_private *)dev->private)
82
83#define DT2814_TIMEOUT 10
84#define DT2814_MAX_SPEED 100000	/* Arbitrary 10 khz limit */
85
86static int dt2814_ai_insn_read(struct comedi_device *dev, struct comedi_subdevice *s,
87	struct comedi_insn *insn, unsigned int *data)
88{
89	int n, i, hi, lo;
90	int chan;
91	int status = 0;
92
93	for (n = 0; n < insn->n; n++) {
94		chan = CR_CHAN(insn->chanspec);
95
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);
100			comedi_udelay(10);
101			if (status & DT2814_FINISH)
102				break;
103		}
104		if (i >= DT2814_TIMEOUT) {
105			printk("dt2814: status: %02x\n", status);
106			return -ETIMEDOUT;
107		}
108
109		hi = inb(dev->iobase + DT2814_DATA);
110		lo = inb(dev->iobase + DT2814_DATA);
111
112		data[n] = (hi << 4) | (lo >> 4);
113	}
114
115	return n;
116}
117
118static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
119{
120	int i;
121	unsigned int f;
122
123	/* XXX ignores flags */
124
125	f = 10000;		/* ns */
126	for (i = 0; i < 8; i++) {
127		if ((2 * (*ns)) < (f * 11))
128			break;
129		f *= 10;
130	}
131
132	*ns = f;
133
134	return i;
135}
136
137static int dt2814_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
138	struct comedi_cmd *cmd)
139{
140	int err = 0;
141	int tmp;
142
143	/* step 1: make sure trigger sources are trivially valid */
144
145	tmp = cmd->start_src;
146	cmd->start_src &= TRIG_NOW;
147	if (!cmd->start_src || tmp != cmd->start_src)
148		err++;
149
150	tmp = cmd->scan_begin_src;
151	cmd->scan_begin_src &= TRIG_TIMER;
152	if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
153		err++;
154
155	tmp = cmd->convert_src;
156	cmd->convert_src &= TRIG_NOW;
157	if (!cmd->convert_src || tmp != cmd->convert_src)
158		err++;
159
160	tmp = cmd->scan_end_src;
161	cmd->scan_end_src &= TRIG_COUNT;
162	if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
163		err++;
164
165	tmp = cmd->stop_src;
166	cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
167	if (!cmd->stop_src || tmp != cmd->stop_src)
168		err++;
169
170	if (err)
171		return 1;
172
173	/* step 2: make sure trigger sources are unique and mutually compatible */
174
175	/* note that mutual compatiblity is not an issue here */
176	if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
177		err++;
178
179	if (err)
180		return 2;
181
182	/* step 3: make sure arguments are trivially compatible */
183
184	if (cmd->start_arg != 0) {
185		cmd->start_arg = 0;
186		err++;
187	}
188	if (cmd->scan_begin_arg > 1000000000) {
189		cmd->scan_begin_arg = 1000000000;
190		err++;
191	}
192	if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
193		cmd->scan_begin_arg = DT2814_MAX_SPEED;
194		err++;
195	}
196	if (cmd->scan_end_arg != cmd->chanlist_len) {
197		cmd->scan_end_arg = cmd->chanlist_len;
198		err++;
199	}
200	if (cmd->stop_src == TRIG_COUNT) {
201		if (cmd->stop_arg < 2) {
202			cmd->stop_arg = 2;
203			err++;
204		}
205	} else {
206		/* TRIG_NONE */
207		if (cmd->stop_arg != 0) {
208			cmd->stop_arg = 0;
209			err++;
210		}
211	}
212
213	if (err)
214		return 3;
215
216	/* step 4: fix up any arguments */
217
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)
221		err++;
222
223	if (err)
224		return 4;
225
226	return 0;
227}
228
229static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
230{
231	struct comedi_cmd *cmd = &s->async->cmd;
232	int chan;
233	int trigvar;
234
235	trigvar =
236		dt2814_ns_to_timer(&cmd->scan_begin_arg,
237		cmd->flags & TRIG_ROUND_MASK);
238
239	chan = CR_CHAN(cmd->chanlist[0]);
240
241	devpriv->ntrig = cmd->stop_arg;
242	outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
243
244	return 0;
245
246}
247
248static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
249{
250	int i, irq;
251	int ret;
252	struct comedi_subdevice *s;
253	unsigned long iobase;
254
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");
259		return -EIO;
260	}
261	dev->iobase = iobase;
262	dev->board_name = "dt2814";
263
264	outb(0, dev->iobase + DT2814_CSR);
265	comedi_udelay(100);
266	if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
267		printk("reset error (fatal)\n");
268		return -EIO;
269	}
270	i = inb(dev->iobase + DT2814_DATA);
271	i = inb(dev->iobase + DT2814_DATA);
272
273	irq = it->options[1];
274#if 0
275	if (irq < 0) {
276		save_flags(flags);
277		sti();
278		irqs = probe_irq_on();
279
280		outb(0, dev->iobase + DT2814_CSR);
281
282		comedi_udelay(100);
283
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");
288		}
289
290		i = inb(dev->iobase + DT2814_DATA);
291		i = inb(dev->iobase + DT2814_DATA);
292	}
293#endif
294	dev->irq = 0;
295	if (irq > 0) {
296		if (comedi_request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
297			printk("(irq %d unavailable)\n", irq);
298		} else {
299			printk("( irq = %d )\n", irq);
300			dev->irq = irq;
301		}
302	} else if (irq == 0) {
303		printk("(no irq)\n");
304	} else {
305#if 0
306		printk("(probe returned multiple irqs--bad)\n");
307#else
308		printk("(irq probe not implemented)\n");
309#endif
310	}
311
312	ret = alloc_subdevices(dev, 1);
313	if (ret < 0)
314		return ret;
315
316	ret = alloc_private(dev, sizeof(struct dt2814_private));
317	if (ret < 0)
318		return ret;
319
320	s = dev->subdevices + 0;
321	dev->read_subdev = s;
322	s->type = COMEDI_SUBD_AI;
323	s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
324	s->n_chan = 16;		/* XXX */
325	s->len_chanlist = 1;
326	s->insn_read = dt2814_ai_insn_read;
327	s->do_cmd = dt2814_ai_cmd;
328	s->do_cmdtest = dt2814_ai_cmdtest;
329	s->maxdata = 0xfff;
330	s->range_table = &range_unknown;	/* XXX */
331
332	return 0;
333}
334
335static int dt2814_detach(struct comedi_device *dev)
336{
337	printk("comedi%d: dt2814: remove\n", dev->minor);
338
339	if (dev->irq) {
340		comedi_free_irq(dev->irq, dev);
341	}
342	if (dev->iobase) {
343		release_region(dev->iobase, DT2814_SIZE);
344	}
345
346	return 0;
347}
348
349static irqreturn_t dt2814_interrupt(int irq, void *d)
350{
351	int lo, hi;
352	struct comedi_device *dev = d;
353	struct comedi_subdevice *s;
354	int data;
355
356	if (!dev->attached) {
357		comedi_error(dev, "spurious interrupt");
358		return IRQ_HANDLED;
359	}
360
361	s = dev->subdevices + 0;
362
363	hi = inb(dev->iobase + DT2814_DATA);
364	lo = inb(dev->iobase + DT2814_DATA);
365
366	data = (hi << 4) | (lo >> 4);
367
368	if (!(--devpriv->ntrig)) {
369		int i;
370
371		outb(0, dev->iobase + DT2814_CSR);
372		/* note: turning off timed mode triggers another
373		   sample. */
374
375		for (i = 0; i < DT2814_TIMEOUT; i++) {
376			if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
377				break;
378		}
379		inb(dev->iobase + DT2814_DATA);
380		inb(dev->iobase + DT2814_DATA);
381
382		s->async->events |= COMEDI_CB_EOA;
383	}
384	comedi_event(dev, s);
385	return IRQ_HANDLED;
386}
387