2 comedi/drivers/dt282x.c
3 Hardware driver for Data Translation DT2821 series
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-8 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 DT2821 series (including DT-EZ)
27 Devices: [Data Translation] DT2821 (dt2821),
28 DT2821-F-16SE (dt2821-f), DT2821-F-8DI (dt2821-f),
29 DT2821-G-16SE (dt2821-f), DT2821-G-8DI (dt2821-g),
31 DT2824-PGH (dt2824-pgh), DT2824-PGL (dt2824-pgl), DT2825 (dt2825),
32 DT2827 (dt2827), DT2828 (dt2828), DT21-EZ (dt21-ez), DT23-EZ (dt23-ez),
33 DT24-EZ (dt24-ez), DT24-EZ-PGL (dt24-ez-pgl)
35 Updated: Wed, 22 Aug 2001 17:11:34 -0700
37 Configuration options:
38 [0] - I/O port base address
42 [4] - AI jumpered for 0=single ended, 1=differential
43 [5] - AI jumpered for 0=straight binary, 1=2's complement
44 [6] - AO 0 jumpered for 0=straight binary, 1=2's complement
45 [7] - AO 1 jumpered for 0=straight binary, 1=2's complement
46 [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5]
47 [9] - AO 0 jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5],
49 [10]- A0 1 jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5],
53 - AO commands might be broken.
54 - If you try to run a command on both the AI and AO subdevices
55 simultaneously, bad things will happen. The driver needs to
56 be fixed to check for this situation and return an error.
59 #include "../comedidev.h"
61 #include <linux/gfp.h>
62 #include <linux/ioport.h>
63 #include <linux/interrupt.h>
66 #include "comedi_fc.h"
70 #define DT2821_TIMEOUT 100 /* 500 us */
71 #define DT2821_SIZE 0x10
74 * Registers in the DT282x
77 #define DT2821_ADCSR 0x00 /* A/D Control/Status */
78 #define DT2821_CHANCSR 0x02 /* Channel Control/Status */
79 #define DT2821_ADDAT 0x04 /* A/D data */
80 #define DT2821_DACSR 0x06 /* D/A Control/Status */
81 #define DT2821_DADAT 0x08 /* D/A data */
82 #define DT2821_DIODAT 0x0a /* digital data */
83 #define DT2821_SUPCSR 0x0c /* Supervisor Control/Status */
84 #define DT2821_TMRCTR 0x0e /* Timer/Counter */
87 * At power up, some registers are in a well-known state. The
88 * masks and values are as follows:
91 #define DT2821_ADCSR_MASK 0xfff0
92 #define DT2821_ADCSR_VAL 0x7c00
94 #define DT2821_CHANCSR_MASK 0xf0f0
95 #define DT2821_CHANCSR_VAL 0x70f0
97 #define DT2821_DACSR_MASK 0x7c93
98 #define DT2821_DACSR_VAL 0x7c90
100 #define DT2821_SUPCSR_MASK 0xf8ff
101 #define DT2821_SUPCSR_VAL 0x0000
103 #define DT2821_TMRCTR_MASK 0xff00
104 #define DT2821_TMRCTR_VAL 0xf000
107 * Bit fields of each register
112 #define DT2821_ADERR 0x8000 /* (R) 1 for A/D error */
113 #define DT2821_ADCLK 0x0200 /* (R/W) A/D clock enable */
114 /* 0x7c00 read as 1's */
115 #define DT2821_MUXBUSY 0x0100 /* (R) multiplexer busy */
116 #define DT2821_ADDONE 0x0080 /* (R) A/D done */
117 #define DT2821_IADDONE 0x0040 /* (R/W) interrupt on A/D done */
118 /* 0x0030 gain select */
119 /* 0x000f channel select */
123 #define DT2821_LLE 0x8000 /* (R/W) Load List Enable */
124 /* 0x7000 read as 1's */
125 /* 0x0f00 (R) present address */
126 /* 0x00f0 read as 1's */
127 /* 0x000f (R) number of entries - 1 */
131 #define DT2821_DAERR 0x8000 /* (R) D/A error */
132 #define DT2821_YSEL 0x0200 /* (R/W) DAC 1 select */
133 #define DT2821_SSEL 0x0100 /* (R/W) single channel select */
134 #define DT2821_DACRDY 0x0080 /* (R) DAC ready */
135 #define DT2821_IDARDY 0x0040 /* (R/W) interrupt on DAC ready */
136 #define DT2821_DACLK 0x0020 /* (R/W) D/A clock enable */
137 #define DT2821_HBOE 0x0002 /* (R/W) DIO high byte output enable */
138 #define DT2821_LBOE 0x0001 /* (R/W) DIO low byte output enable */
142 #define DT2821_DMAD 0x8000 /* (R) DMA done */
143 #define DT2821_ERRINTEN 0x4000 /* (R/W) interrupt on error */
144 #define DT2821_CLRDMADNE 0x2000 /* (W) clear DMA done */
145 #define DT2821_DDMA 0x1000 /* (R/W) dual DMA */
146 #define DT2821_DS1 0x0800 /* (R/W) DMA select 1 */
147 #define DT2821_DS0 0x0400 /* (R/W) DMA select 0 */
148 #define DT2821_BUFFB 0x0200 /* (R/W) buffer B selected */
149 #define DT2821_SCDN 0x0100 /* (R) scan done */
150 #define DT2821_DACON 0x0080 /* (W) DAC single conversion */
151 #define DT2821_ADCINIT 0x0040 /* (W) A/D initialize */
152 #define DT2821_DACINIT 0x0020 /* (W) D/A initialize */
153 #define DT2821_PRLD 0x0010 /* (W) preload multiplexer */
154 #define DT2821_STRIG 0x0008 /* (W) software trigger */
155 #define DT2821_XTRIG 0x0004 /* (R/W) external trigger enable */
156 #define DT2821_XCLK 0x0002 /* (R/W) external clock enable */
157 #define DT2821_BDINIT 0x0001 /* (W) initialize board */
159 static const struct comedi_lrange range_dt282x_ai_lo_bipolar = {
168 static const struct comedi_lrange range_dt282x_ai_lo_unipolar = {
177 static const struct comedi_lrange range_dt282x_ai_5_bipolar = {
186 static const struct comedi_lrange range_dt282x_ai_5_unipolar = {
195 static const struct comedi_lrange range_dt282x_ai_hi_bipolar = {
204 static const struct comedi_lrange range_dt282x_ai_hi_unipolar = {
213 struct dt282x_board {
224 struct dt282x_private {
225 int ad_2scomp; /* we have 2's comp jumper set */
226 int da0_2scomp; /* same, for DAC0 */
227 int da1_2scomp; /* same, for DAC1 */
229 const struct comedi_lrange *darangelist[2];
233 volatile int dacsr; /* software copies of registers */
242 short *buf; /* DMA buffer */
243 volatile int size; /* size of current transfer */
245 int dma_maxsize; /* max size of DMA transfer (in bytes) */
246 int usedma; /* driver uses DMA */
247 volatile int current_dma_index;
252 * Some useless abstractions
254 #define chan_to_DAC(a) ((a)&1)
255 #define mux_busy() (inw(dev->iobase+DT2821_ADCSR)&DT2821_MUXBUSY)
256 #define ad_done() (inw(dev->iobase+DT2821_ADCSR)&DT2821_ADDONE)
259 * danger! macro abuse... a is the expression to wait on, and b is
260 * the statement(s) to execute if it doesn't happen.
262 #define wait_for(a, b) \
265 for (_i = 0; _i < DT2821_TIMEOUT; _i++) { \
277 static int prep_ai_dma(struct comedi_device *dev, int chan, int size);
278 static int prep_ao_dma(struct comedi_device *dev, int chan, int size);
279 static int dt282x_ai_cancel(struct comedi_device *dev,
280 struct comedi_subdevice *s);
281 static int dt282x_ao_cancel(struct comedi_device *dev,
282 struct comedi_subdevice *s);
283 static int dt282x_ns_to_timer(int *nanosec, int round_mode);
284 static void dt282x_disable_dma(struct comedi_device *dev);
286 static int dt282x_grab_dma(struct comedi_device *dev, int dma1, int dma2);
288 static void dt282x_munge(struct comedi_device *dev, short *buf,
291 const struct dt282x_board *board = comedi_board(dev);
292 struct dt282x_private *devpriv = dev->private;
294 unsigned short mask = (1 << board->adbits) - 1;
295 unsigned short sign = 1 << (board->adbits - 1);
298 if (devpriv->ad_2scomp)
299 sign = 1 << (board->adbits - 1);
304 comedi_error(dev, "bug! odd number of bytes from dma xfer");
306 for (i = 0; i < n; i++)
307 buf[i] = (buf[i] & mask) ^ sign;
310 static void dt282x_ao_dma_interrupt(struct comedi_device *dev)
312 struct dt282x_private *devpriv = dev->private;
316 struct comedi_subdevice *s = &dev->subdevices[1];
318 outw(devpriv->supcsr | DT2821_CLRDMADNE, dev->iobase + DT2821_SUPCSR);
320 if (!s->async->prealloc_buf) {
321 printk(KERN_ERR "async->data disappeared. dang!\n");
325 i = devpriv->current_dma_index;
326 ptr = devpriv->dma[i].buf;
328 disable_dma(devpriv->dma[i].chan);
330 devpriv->current_dma_index = 1 - i;
332 size = cfc_read_array_from_buffer(s, ptr, devpriv->dma_maxsize);
334 printk(KERN_ERR "dt282x: AO underrun\n");
335 dt282x_ao_cancel(dev, s);
336 s->async->events |= COMEDI_CB_OVERFLOW;
339 prep_ao_dma(dev, i, size);
343 static void dt282x_ai_dma_interrupt(struct comedi_device *dev)
345 struct dt282x_private *devpriv = dev->private;
350 struct comedi_subdevice *s = &dev->subdevices[0];
352 outw(devpriv->supcsr | DT2821_CLRDMADNE, dev->iobase + DT2821_SUPCSR);
354 if (!s->async->prealloc_buf) {
355 printk(KERN_ERR "async->data disappeared. dang!\n");
359 i = devpriv->current_dma_index;
360 ptr = devpriv->dma[i].buf;
361 size = devpriv->dma[i].size;
363 disable_dma(devpriv->dma[i].chan);
365 devpriv->current_dma_index = 1 - i;
367 dt282x_munge(dev, ptr, size);
368 ret = cfc_write_array_to_buffer(s, ptr, size);
370 dt282x_ai_cancel(dev, s);
373 devpriv->nread -= size / 2;
375 if (devpriv->nread < 0) {
376 printk(KERN_INFO "dt282x: off by one\n");
379 if (!devpriv->nread) {
380 dt282x_ai_cancel(dev, s);
381 s->async->events |= COMEDI_CB_EOA;
385 /* clear the dual dma flag, making this the last dma segment */
386 /* XXX probably wrong */
387 if (!devpriv->ntrig) {
388 devpriv->supcsr &= ~(DT2821_DDMA);
389 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR);
392 /* restart the channel */
393 prep_ai_dma(dev, i, 0);
396 static int prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
398 struct dt282x_private *devpriv = dev->private;
400 unsigned long dma_ptr;
407 n = devpriv->dma_maxsize;
408 if (n > devpriv->ntrig * 2)
409 n = devpriv->ntrig * 2;
410 devpriv->ntrig -= n / 2;
412 devpriv->dma[dma_index].size = n;
413 dma_chan = devpriv->dma[dma_index].chan;
414 dma_ptr = virt_to_bus(devpriv->dma[dma_index].buf);
416 set_dma_mode(dma_chan, DMA_MODE_READ);
417 flags = claim_dma_lock();
418 clear_dma_ff(dma_chan);
419 set_dma_addr(dma_chan, dma_ptr);
420 set_dma_count(dma_chan, n);
421 release_dma_lock(flags);
423 enable_dma(dma_chan);
428 static int prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
430 struct dt282x_private *devpriv = dev->private;
432 unsigned long dma_ptr;
435 devpriv->dma[dma_index].size = n;
436 dma_chan = devpriv->dma[dma_index].chan;
437 dma_ptr = virt_to_bus(devpriv->dma[dma_index].buf);
439 set_dma_mode(dma_chan, DMA_MODE_WRITE);
440 flags = claim_dma_lock();
441 clear_dma_ff(dma_chan);
442 set_dma_addr(dma_chan, dma_ptr);
443 set_dma_count(dma_chan, n);
444 release_dma_lock(flags);
446 enable_dma(dma_chan);
451 static irqreturn_t dt282x_interrupt(int irq, void *d)
453 struct comedi_device *dev = d;
454 struct dt282x_private *devpriv = dev->private;
455 struct comedi_subdevice *s;
456 struct comedi_subdevice *s_ao;
457 unsigned int supcsr, adcsr, dacsr;
460 if (!dev->attached) {
461 comedi_error(dev, "spurious interrupt");
465 s = &dev->subdevices[0];
466 s_ao = &dev->subdevices[1];
467 adcsr = inw(dev->iobase + DT2821_ADCSR);
468 dacsr = inw(dev->iobase + DT2821_DACSR);
469 supcsr = inw(dev->iobase + DT2821_SUPCSR);
470 if (supcsr & DT2821_DMAD) {
471 if (devpriv->dma_dir == DMA_MODE_READ)
472 dt282x_ai_dma_interrupt(dev);
474 dt282x_ao_dma_interrupt(dev);
477 if (adcsr & DT2821_ADERR) {
478 if (devpriv->nread != 0) {
479 comedi_error(dev, "A/D error");
480 dt282x_ai_cancel(dev, s);
481 s->async->events |= COMEDI_CB_ERROR;
485 if (dacsr & DT2821_DAERR) {
489 disable_irq(dev->irq);
490 printk(KERN_INFO "disabling irq\n");
493 comedi_error(dev, "D/A error");
494 dt282x_ao_cancel(dev, s_ao);
495 s->async->events |= COMEDI_CB_ERROR;
499 if (adcsr & DT2821_ADDONE) {
503 data = (short)inw(dev->iobase + DT2821_ADDAT);
504 data &= (1 << board->adbits) - 1;
506 if (devpriv->ad_2scomp)
507 data ^= 1 << (board->adbits - 1);
508 ret = comedi_buf_put(s->async, data);
511 s->async->events |= COMEDI_CB_OVERFLOW;
514 if (!devpriv->nread) {
515 s->async->events |= COMEDI_CB_EOA;
517 if (supcsr & DT2821_SCDN)
518 outw(devpriv->supcsr | DT2821_STRIG,
519 dev->iobase + DT2821_SUPCSR);
524 comedi_event(dev, s);
525 /* printk("adcsr=0x%02x dacsr-0x%02x supcsr=0x%02x\n",
526 adcsr, dacsr, supcsr); */
527 return IRQ_RETVAL(handled);
530 static void dt282x_load_changain(struct comedi_device *dev, int n,
531 unsigned int *chanlist)
533 struct dt282x_private *devpriv = dev->private;
535 unsigned int chan, range;
537 outw(DT2821_LLE | (n - 1), dev->iobase + DT2821_CHANCSR);
538 for (i = 0; i < n; i++) {
539 chan = CR_CHAN(chanlist[i]);
540 range = CR_RANGE(chanlist[i]);
541 outw(devpriv->adcsr | (range << 4) | chan,
542 dev->iobase + DT2821_ADCSR);
544 outw(n - 1, dev->iobase + DT2821_CHANCSR);
548 * Performs a single A/D conversion.
549 * - Put channel/gain into channel-gain list
550 * - preload multiplexer
551 * - trigger conversion and wait for it to finish
553 static int dt282x_ai_insn_read(struct comedi_device *dev,
554 struct comedi_subdevice *s,
555 struct comedi_insn *insn, unsigned int *data)
557 const struct dt282x_board *board = comedi_board(dev);
558 struct dt282x_private *devpriv = dev->private;
561 /* XXX should we really be enabling the ad clock here? */
562 devpriv->adcsr = DT2821_ADCLK;
563 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR);
565 dt282x_load_changain(dev, 1, &insn->chanspec);
567 outw(devpriv->supcsr | DT2821_PRLD, dev->iobase + DT2821_SUPCSR);
568 wait_for(!mux_busy(), comedi_error(dev, "timeout\n"); return -ETIME;);
570 for (i = 0; i < insn->n; i++) {
571 outw(devpriv->supcsr | DT2821_STRIG,
572 dev->iobase + DT2821_SUPCSR);
573 wait_for(ad_done(), comedi_error(dev, "timeout\n");
578 DT2821_ADDAT) & ((1 << board->adbits) - 1);
579 if (devpriv->ad_2scomp)
580 data[i] ^= (1 << (board->adbits - 1));
586 static int dt282x_ai_cmdtest(struct comedi_device *dev,
587 struct comedi_subdevice *s, struct comedi_cmd *cmd)
589 const struct dt282x_board *board = comedi_board(dev);
593 /* Step 1 : check if triggers are trivially valid */
595 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
596 err |= cfc_check_trigger_src(&cmd->scan_begin_src,
597 TRIG_FOLLOW | TRIG_EXT);
598 err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
599 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
600 err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
605 /* Step 2a : make sure trigger sources are unique */
607 err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
608 err |= cfc_check_trigger_is_unique(cmd->stop_src);
610 /* Step 2b : and mutually compatible */
615 /* Step 3: check if arguments are trivially valid */
617 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
619 if (cmd->scan_begin_src == TRIG_FOLLOW) {
620 /* internal trigger */
621 err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
623 /* external trigger */
624 /* should be level/edge, hi/lo specification here */
625 err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
628 err |= cfc_check_trigger_arg_min(&cmd->convert_arg, 4000);
630 #define SLOWEST_TIMER (250*(1<<15)*255)
631 err |= cfc_check_trigger_arg_max(&cmd->convert_arg, SLOWEST_TIMER);
632 err |= cfc_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed);
633 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
635 if (cmd->stop_src == TRIG_COUNT) {
636 /* any count is allowed */
637 } else { /* TRIG_NONE */
638 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
644 /* step 4: fix up any arguments */
646 tmp = cmd->convert_arg;
647 dt282x_ns_to_timer(&cmd->convert_arg, cmd->flags & TRIG_ROUND_MASK);
648 if (tmp != cmd->convert_arg)
657 static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
659 const struct dt282x_board *board = comedi_board(dev);
660 struct dt282x_private *devpriv = dev->private;
661 struct comedi_cmd *cmd = &s->async->cmd;
664 if (devpriv->usedma == 0) {
666 "driver requires 2 dma channels"
667 " to execute command");
671 dt282x_disable_dma(dev);
673 if (cmd->convert_arg < board->ai_speed)
674 cmd->convert_arg = board->ai_speed;
675 timer = dt282x_ns_to_timer(&cmd->convert_arg, TRIG_ROUND_NEAREST);
676 outw(timer, dev->iobase + DT2821_TMRCTR);
678 if (cmd->scan_begin_src == TRIG_FOLLOW) {
679 /* internal trigger */
680 devpriv->supcsr = DT2821_ERRINTEN | DT2821_DS0;
682 /* external trigger */
683 devpriv->supcsr = DT2821_ERRINTEN | DT2821_DS0 | DT2821_DS1;
685 outw(devpriv->supcsr | DT2821_CLRDMADNE | DT2821_BUFFB | DT2821_ADCINIT,
686 dev->iobase + DT2821_SUPCSR);
688 devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
689 devpriv->nread = devpriv->ntrig;
691 devpriv->dma_dir = DMA_MODE_READ;
692 devpriv->current_dma_index = 0;
693 prep_ai_dma(dev, 0, 0);
694 if (devpriv->ntrig) {
695 prep_ai_dma(dev, 1, 0);
696 devpriv->supcsr |= DT2821_DDMA;
697 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR);
702 dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
704 devpriv->adcsr = DT2821_ADCLK | DT2821_IADDONE;
705 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR);
707 outw(devpriv->supcsr | DT2821_PRLD, dev->iobase + DT2821_SUPCSR);
708 wait_for(!mux_busy(), comedi_error(dev, "timeout\n"); return -ETIME;);
710 if (cmd->scan_begin_src == TRIG_FOLLOW) {
711 outw(devpriv->supcsr | DT2821_STRIG,
712 dev->iobase + DT2821_SUPCSR);
714 devpriv->supcsr |= DT2821_XTRIG;
715 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR);
721 static void dt282x_disable_dma(struct comedi_device *dev)
723 struct dt282x_private *devpriv = dev->private;
725 if (devpriv->usedma) {
726 disable_dma(devpriv->dma[0].chan);
727 disable_dma(devpriv->dma[1].chan);
731 static int dt282x_ai_cancel(struct comedi_device *dev,
732 struct comedi_subdevice *s)
734 struct dt282x_private *devpriv = dev->private;
736 dt282x_disable_dma(dev);
739 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR);
742 outw(devpriv->supcsr | DT2821_ADCINIT, dev->iobase + DT2821_SUPCSR);
747 static int dt282x_ns_to_timer(int *nanosec, int round_mode)
749 int prescale, base, divider;
751 for (prescale = 0; prescale < 16; prescale++) {
754 base = 250 * (1 << prescale);
755 switch (round_mode) {
756 case TRIG_ROUND_NEAREST:
758 divider = (*nanosec + base / 2) / base;
760 case TRIG_ROUND_DOWN:
761 divider = (*nanosec) / base;
764 divider = (*nanosec + base - 1) / base;
768 *nanosec = divider * base;
769 return (prescale << 8) | (255 - divider);
772 base = 250 * (1 << 15);
774 *nanosec = divider * base;
775 return (15 << 8) | (255 - divider);
779 * Analog output routine. Selects single channel conversion,
780 * selects correct channel, converts from 2's compliment to
781 * offset binary if necessary, loads the data into the DAC
782 * data register, and performs the conversion.
784 static int dt282x_ao_insn_read(struct comedi_device *dev,
785 struct comedi_subdevice *s,
786 struct comedi_insn *insn, unsigned int *data)
788 struct dt282x_private *devpriv = dev->private;
790 data[0] = devpriv->ao[CR_CHAN(insn->chanspec)];
795 static int dt282x_ao_insn_write(struct comedi_device *dev,
796 struct comedi_subdevice *s,
797 struct comedi_insn *insn, unsigned int *data)
799 const struct dt282x_board *board = comedi_board(dev);
800 struct dt282x_private *devpriv = dev->private;
804 chan = CR_CHAN(insn->chanspec);
806 d &= (1 << board->dabits) - 1;
807 devpriv->ao[chan] = d;
809 devpriv->dacsr |= DT2821_SSEL;
813 devpriv->dacsr |= DT2821_YSEL;
814 if (devpriv->da0_2scomp)
815 d ^= (1 << (board->dabits - 1));
817 devpriv->dacsr &= ~DT2821_YSEL;
818 if (devpriv->da1_2scomp)
819 d ^= (1 << (board->dabits - 1));
822 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR);
824 outw(d, dev->iobase + DT2821_DADAT);
826 outw(devpriv->supcsr | DT2821_DACON, dev->iobase + DT2821_SUPCSR);
831 static int dt282x_ao_cmdtest(struct comedi_device *dev,
832 struct comedi_subdevice *s, struct comedi_cmd *cmd)
837 /* Step 1 : check if triggers are trivially valid */
839 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_INT);
840 err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
841 err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
842 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
843 err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
848 /* Step 2a : make sure trigger sources are unique */
850 err |= cfc_check_trigger_is_unique(cmd->stop_src);
852 /* Step 2b : and mutually compatible */
857 /* Step 3: check if arguments are trivially valid */
859 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
860 err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg, 5000);
861 err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
862 err |= cfc_check_trigger_arg_max(&cmd->scan_end_arg, 2);
864 if (cmd->stop_src == TRIG_COUNT) {
865 /* any count is allowed */
866 } else { /* TRIG_NONE */
867 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
873 /* step 4: fix up any arguments */
875 tmp = cmd->scan_begin_arg;
876 dt282x_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
877 if (tmp != cmd->scan_begin_arg)
887 static int dt282x_ao_inttrig(struct comedi_device *dev,
888 struct comedi_subdevice *s, unsigned int x)
890 struct dt282x_private *devpriv = dev->private;
896 size = cfc_read_array_from_buffer(s, devpriv->dma[0].buf,
897 devpriv->dma_maxsize);
899 printk(KERN_ERR "dt282x: AO underrun\n");
902 prep_ao_dma(dev, 0, size);
904 size = cfc_read_array_from_buffer(s, devpriv->dma[1].buf,
905 devpriv->dma_maxsize);
907 printk(KERN_ERR "dt282x: AO underrun\n");
910 prep_ao_dma(dev, 1, size);
912 outw(devpriv->supcsr | DT2821_STRIG, dev->iobase + DT2821_SUPCSR);
913 s->async->inttrig = NULL;
918 static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
920 struct dt282x_private *devpriv = dev->private;
922 struct comedi_cmd *cmd = &s->async->cmd;
924 if (devpriv->usedma == 0) {
926 "driver requires 2 dma channels"
927 " to execute command");
931 dt282x_disable_dma(dev);
933 devpriv->supcsr = DT2821_ERRINTEN | DT2821_DS1 | DT2821_DDMA;
934 outw(devpriv->supcsr | DT2821_CLRDMADNE | DT2821_BUFFB | DT2821_DACINIT,
935 dev->iobase + DT2821_SUPCSR);
937 devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
938 devpriv->nread = devpriv->ntrig;
940 devpriv->dma_dir = DMA_MODE_WRITE;
941 devpriv->current_dma_index = 0;
943 timer = dt282x_ns_to_timer(&cmd->scan_begin_arg, TRIG_ROUND_NEAREST);
944 outw(timer, dev->iobase + DT2821_TMRCTR);
946 devpriv->dacsr = DT2821_SSEL | DT2821_DACLK | DT2821_IDARDY;
947 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR);
949 s->async->inttrig = dt282x_ao_inttrig;
954 static int dt282x_ao_cancel(struct comedi_device *dev,
955 struct comedi_subdevice *s)
957 struct dt282x_private *devpriv = dev->private;
959 dt282x_disable_dma(dev);
962 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR);
965 outw(devpriv->supcsr | DT2821_DACINIT, dev->iobase + DT2821_SUPCSR);
970 static int dt282x_dio_insn_bits(struct comedi_device *dev,
971 struct comedi_subdevice *s,
972 struct comedi_insn *insn, unsigned int *data)
975 s->state &= ~data[0];
976 s->state |= (data[0] & data[1]);
978 outw(s->state, dev->iobase + DT2821_DIODAT);
980 data[1] = inw(dev->iobase + DT2821_DIODAT);
985 static int dt282x_dio_insn_config(struct comedi_device *dev,
986 struct comedi_subdevice *s,
987 struct comedi_insn *insn, unsigned int *data)
989 struct dt282x_private *devpriv = dev->private;
992 mask = (CR_CHAN(insn->chanspec) < 8) ? 0x00ff : 0xff00;
998 if (s->io_bits & 0x00ff)
999 devpriv->dacsr |= DT2821_LBOE;
1001 devpriv->dacsr &= ~DT2821_LBOE;
1002 if (s->io_bits & 0xff00)
1003 devpriv->dacsr |= DT2821_HBOE;
1005 devpriv->dacsr &= ~DT2821_HBOE;
1007 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR);
1012 static const struct comedi_lrange *const ai_range_table[] = {
1013 &range_dt282x_ai_lo_bipolar,
1014 &range_dt282x_ai_lo_unipolar,
1015 &range_dt282x_ai_5_bipolar,
1016 &range_dt282x_ai_5_unipolar
1019 static const struct comedi_lrange *const ai_range_pgl_table[] = {
1020 &range_dt282x_ai_hi_bipolar,
1021 &range_dt282x_ai_hi_unipolar
1024 static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
1027 if (x < 0 || x >= 2)
1029 return ai_range_pgl_table[x];
1031 if (x < 0 || x >= 4)
1033 return ai_range_table[x];
1037 static const struct comedi_lrange *const ao_range_table[] = {
1045 static const struct comedi_lrange *opt_ao_range_lkup(int x)
1047 if (x < 0 || x >= 5)
1049 return ao_range_table[x];
1052 enum { /* i/o base, irq, dma channels */
1053 opt_iobase = 0, opt_irq, opt_dma1, opt_dma2,
1054 opt_diff, /* differential */
1055 opt_ai_twos, opt_ao0_twos, opt_ao1_twos, /* twos comp */
1056 opt_ai_range, opt_ao0_range, opt_ao1_range, /* range */
1059 static int dt282x_grab_dma(struct comedi_device *dev, int dma1, int dma2)
1061 struct dt282x_private *devpriv = dev->private;
1064 devpriv->usedma = 0;
1066 if (!dma1 && !dma2) {
1067 printk(KERN_ERR " (no dma)");
1071 if (dma1 == dma2 || dma1 < 5 || dma2 < 5 || dma1 > 7 || dma2 > 7)
1081 ret = request_dma(dma1, "dt282x A");
1084 devpriv->dma[0].chan = dma1;
1086 ret = request_dma(dma2, "dt282x B");
1089 devpriv->dma[1].chan = dma2;
1091 devpriv->dma_maxsize = PAGE_SIZE;
1092 devpriv->dma[0].buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
1093 devpriv->dma[1].buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
1094 if (!devpriv->dma[0].buf || !devpriv->dma[1].buf) {
1095 printk(KERN_ERR " can't get DMA memory");
1099 printk(KERN_INFO " (dma=%d,%d)", dma1, dma2);
1101 devpriv->usedma = 1;
1112 4 0=single ended, 1=differential
1113 5 ai 0=straight binary, 1=2's comp
1114 6 ao0 0=straight binary, 1=2's comp
1115 7 ao1 0=straight binary, 1=2's comp
1116 8 ai 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V
1117 9 ao0 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
1118 10 ao1 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
1120 static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1122 const struct dt282x_board *board = comedi_board(dev);
1123 struct dt282x_private *devpriv;
1126 struct comedi_subdevice *s;
1128 ret = comedi_request_region(dev, it->options[0], DT2821_SIZE);
1132 outw(DT2821_BDINIT, dev->iobase + DT2821_SUPCSR);
1133 i = inw(dev->iobase + DT2821_ADCSR);
1135 printk(KERN_DEBUG " fingerprint=%x,%x,%x,%x,%x",
1136 inw(dev->iobase + DT2821_ADCSR),
1137 inw(dev->iobase + DT2821_CHANCSR),
1138 inw(dev->iobase + DT2821_DACSR),
1139 inw(dev->iobase + DT2821_SUPCSR),
1140 inw(dev->iobase + DT2821_TMRCTR));
1143 if (((inw(dev->iobase + DT2821_ADCSR) & DT2821_ADCSR_MASK)
1144 != DT2821_ADCSR_VAL) ||
1145 ((inw(dev->iobase + DT2821_CHANCSR) & DT2821_CHANCSR_MASK)
1146 != DT2821_CHANCSR_VAL) ||
1147 ((inw(dev->iobase + DT2821_DACSR) & DT2821_DACSR_MASK)
1148 != DT2821_DACSR_VAL) ||
1149 ((inw(dev->iobase + DT2821_SUPCSR) & DT2821_SUPCSR_MASK)
1150 != DT2821_SUPCSR_VAL) ||
1151 ((inw(dev->iobase + DT2821_TMRCTR) & DT2821_TMRCTR_MASK)
1152 != DT2821_TMRCTR_VAL)) {
1153 printk(KERN_ERR " board not found");
1156 /* should do board test */
1158 irq = it->options[opt_irq];
1161 unsigned long flags;
1166 irqs = probe_irq_on();
1168 /* trigger interrupt */
1172 irq = probe_irq_off(irqs);
1173 restore_flags(flags);
1175 printk(KERN_ERR " error probing irq (bad)");
1179 printk(KERN_INFO " ( irq = %d )", irq);
1180 ret = request_irq(irq, dt282x_interrupt, 0,
1181 dev->board_name, dev);
1183 printk(KERN_ERR " failed to get irq\n");
1187 } else if (irq == 0) {
1188 printk(KERN_INFO " (no irq)");
1191 printk(KERN_INFO " (probe returned multiple irqs--bad)");
1193 printk(KERN_INFO " (irq probe not implemented)");
1197 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
1200 dev->private = devpriv;
1202 ret = dt282x_grab_dma(dev, it->options[opt_dma1],
1203 it->options[opt_dma2]);
1207 ret = comedi_alloc_subdevices(dev, 3);
1211 s = &dev->subdevices[0];
1213 dev->read_subdev = s;
1215 s->type = COMEDI_SUBD_AI;
1216 s->subdev_flags = SDF_READABLE | SDF_CMD_READ |
1217 ((it->options[opt_diff]) ? SDF_DIFF : SDF_COMMON);
1219 (it->options[opt_diff]) ? board->adchan_di : board->adchan_se;
1220 s->insn_read = dt282x_ai_insn_read;
1221 s->do_cmdtest = dt282x_ai_cmdtest;
1222 s->do_cmd = dt282x_ai_cmd;
1223 s->cancel = dt282x_ai_cancel;
1224 s->maxdata = (1 << board->adbits) - 1;
1225 s->len_chanlist = 16;
1227 opt_ai_range_lkup(board->ispgl, it->options[opt_ai_range]);
1228 devpriv->ad_2scomp = it->options[opt_ai_twos];
1230 s = &dev->subdevices[1];
1232 s->n_chan = board->dachan;
1235 s->type = COMEDI_SUBD_AO;
1236 dev->write_subdev = s;
1237 s->subdev_flags = SDF_WRITABLE | SDF_CMD_WRITE;
1238 s->insn_read = dt282x_ao_insn_read;
1239 s->insn_write = dt282x_ao_insn_write;
1240 s->do_cmdtest = dt282x_ao_cmdtest;
1241 s->do_cmd = dt282x_ao_cmd;
1242 s->cancel = dt282x_ao_cancel;
1243 s->maxdata = (1 << board->dabits) - 1;
1244 s->len_chanlist = 2;
1245 s->range_table_list = devpriv->darangelist;
1246 devpriv->darangelist[0] =
1247 opt_ao_range_lkup(it->options[opt_ao0_range]);
1248 devpriv->darangelist[1] =
1249 opt_ao_range_lkup(it->options[opt_ao1_range]);
1250 devpriv->da0_2scomp = it->options[opt_ao0_twos];
1251 devpriv->da1_2scomp = it->options[opt_ao1_twos];
1253 s->type = COMEDI_SUBD_UNUSED;
1256 s = &dev->subdevices[2];
1258 s->type = COMEDI_SUBD_DIO;
1259 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
1261 s->insn_bits = dt282x_dio_insn_bits;
1262 s->insn_config = dt282x_dio_insn_config;
1264 s->range_table = &range_digital;
1266 printk(KERN_INFO "\n");
1271 static void dt282x_detach(struct comedi_device *dev)
1273 struct dt282x_private *devpriv = dev->private;
1276 if (devpriv->dma[0].chan)
1277 free_dma(devpriv->dma[0].chan);
1278 if (devpriv->dma[1].chan)
1279 free_dma(devpriv->dma[1].chan);
1280 if (devpriv->dma[0].buf)
1281 free_page((unsigned long)devpriv->dma[0].buf);
1282 if (devpriv->dma[1].buf)
1283 free_page((unsigned long)devpriv->dma[1].buf);
1285 comedi_legacy_detach(dev);
1288 static const struct dt282x_board boardtypes[] = {
1326 .name = "dt2824-pgh",
1335 .name = "dt2824-pgl",
1407 .name = "dt24-ez-pgl",
1418 static struct comedi_driver dt282x_driver = {
1419 .driver_name = "dt282x",
1420 .module = THIS_MODULE,
1421 .attach = dt282x_attach,
1422 .detach = dt282x_detach,
1423 .board_name = &boardtypes[0].name,
1424 .num_names = ARRAY_SIZE(boardtypes),
1425 .offset = sizeof(struct dt282x_board),
1427 module_comedi_driver(dt282x_driver);
1429 MODULE_AUTHOR("Comedi http://www.comedi.org");
1430 MODULE_DESCRIPTION("Comedi low-level driver");
1431 MODULE_LICENSE("GPL");