3 * Comedi 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.
21 * Description: Data Translation DT2821 series (including DT-EZ)
23 * Devices: [Data Translation] DT2821 (dt2821), DT2821-F-16SE (dt2821-f),
24 * DT2821-F-8DI (dt2821-f), DT2821-G-16SE (dt2821-g),
25 * DT2821-G-8DI (dt2821-g), DT2823 (dt2823), DT2824-PGH (dt2824-pgh),
26 * DT2824-PGL (dt2824-pgl), DT2825 (dt2825), DT2827 (dt2827),
27 * DT2828 (dt2828), DT2928 (dt2829), DT21-EZ (dt21-ez), DT23-EZ (dt23-ez),
28 * DT24-EZ (dt24-ez), DT24-EZ-PGL (dt24-ez-pgl)
30 * Updated: Wed, 22 Aug 2001 17:11:34 -0700
32 * Configuration options:
33 * [0] - I/O port base address
34 * [1] - IRQ (optional, required for async command support)
35 * [2] - DMA 1 (optional, required for async command support)
36 * [3] - DMA 2 (optional, required for async command support)
37 * [4] - AI jumpered for 0=single ended, 1=differential
38 * [5] - AI jumpered for 0=straight binary, 1=2's complement
39 * [6] - AO 0 data format (deprecated, see below)
40 * [7] - AO 1 data format (deprecated, see below)
41 * [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5]
42 * [9] - AO channel 0 range (deprecated, see below)
43 * [10]- AO channel 1 range (deprecated, see below)
46 * - AO commands might be broken.
47 * - If you try to run a command on both the AI and AO subdevices
48 * simultaneously, bad things will happen. The driver needs to
49 * be fixed to check for this situation and return an error.
50 * - AO range is not programmable. The AO subdevice has a range_table
51 * containing all the possible analog output ranges. Use the range
52 * that matches your board configuration to convert between data
53 * values and physical units. The format of the data written to the
54 * board is handled automatically based on the unipolar/bipolar
55 * range that is selected.
58 #include <linux/module.h>
59 #include <linux/delay.h>
60 #include <linux/gfp.h>
61 #include <linux/interrupt.h>
64 #include "../comedidev.h"
66 #include "comedi_isadma.h"
71 #define DT2821_ADCSR_REG 0x00
72 #define DT2821_ADCSR_ADERR BIT(15)
73 #define DT2821_ADCSR_ADCLK BIT(9)
74 #define DT2821_ADCSR_MUXBUSY BIT(8)
75 #define DT2821_ADCSR_ADDONE BIT(7)
76 #define DT2821_ADCSR_IADDONE BIT(6)
77 #define DT2821_ADCSR_GS(x) (((x) & 0x3) << 4)
78 #define DT2821_ADCSR_CHAN(x) (((x) & 0xf) << 0)
79 #define DT2821_CHANCSR_REG 0x02
80 #define DT2821_CHANCSR_LLE BIT(15)
81 #define DT2821_CHANCSR_TO_PRESLA(x) (((x) >> 8) & 0xf)
82 #define DT2821_CHANCSR_NUMB(x) ((((x) - 1) & 0xf) << 0)
83 #define DT2821_ADDAT_REG 0x04
84 #define DT2821_DACSR_REG 0x06
85 #define DT2821_DACSR_DAERR BIT(15)
86 #define DT2821_DACSR_YSEL(x) ((x) << 9)
87 #define DT2821_DACSR_SSEL BIT(8)
88 #define DT2821_DACSR_DACRDY BIT(7)
89 #define DT2821_DACSR_IDARDY BIT(6)
90 #define DT2821_DACSR_DACLK BIT(5)
91 #define DT2821_DACSR_HBOE BIT(1)
92 #define DT2821_DACSR_LBOE BIT(0)
93 #define DT2821_DADAT_REG 0x08
94 #define DT2821_DIODAT_REG 0x0a
95 #define DT2821_SUPCSR_REG 0x0c
96 #define DT2821_SUPCSR_DMAD BIT(15)
97 #define DT2821_SUPCSR_ERRINTEN BIT(14)
98 #define DT2821_SUPCSR_CLRDMADNE BIT(13)
99 #define DT2821_SUPCSR_DDMA BIT(12)
100 #define DT2821_SUPCSR_DS(x) (((x) & 0x3) << 10)
101 #define DT2821_SUPCSR_DS_PIO DT2821_SUPCSR_DS(0)
102 #define DT2821_SUPCSR_DS_AD_CLK DT2821_SUPCSR_DS(1)
103 #define DT2821_SUPCSR_DS_DA_CLK DT2821_SUPCSR_DS(2)
104 #define DT2821_SUPCSR_DS_AD_TRIG DT2821_SUPCSR_DS(3)
105 #define DT2821_SUPCSR_BUFFB BIT(9)
106 #define DT2821_SUPCSR_SCDN BIT(8)
107 #define DT2821_SUPCSR_DACON BIT(7)
108 #define DT2821_SUPCSR_ADCINIT BIT(6)
109 #define DT2821_SUPCSR_DACINIT BIT(5)
110 #define DT2821_SUPCSR_PRLD BIT(4)
111 #define DT2821_SUPCSR_STRIG BIT(3)
112 #define DT2821_SUPCSR_XTRIG BIT(2)
113 #define DT2821_SUPCSR_XCLK BIT(1)
114 #define DT2821_SUPCSR_BDINIT BIT(0)
115 #define DT2821_TMRCTR_REG 0x0e
117 static const struct comedi_lrange range_dt282x_ai_lo_bipolar = {
126 static const struct comedi_lrange range_dt282x_ai_lo_unipolar = {
135 static const struct comedi_lrange range_dt282x_ai_5_bipolar = {
144 static const struct comedi_lrange range_dt282x_ai_5_unipolar = {
153 static const struct comedi_lrange range_dt282x_ai_hi_bipolar = {
162 static const struct comedi_lrange range_dt282x_ai_hi_unipolar = {
172 * The Analog Output range is set per-channel using jumpers on the board.
173 * All of these ranges may not be available on some DT2821 series boards.
174 * The default jumper setting has both channels set for +/-10V output.
176 static const struct comedi_lrange dt282x_ao_range = {
186 struct dt282x_board {
188 unsigned int ai_maxdata;
194 unsigned int ao_maxdata;
197 static const struct dt282x_board boardtypes[] = {
200 .ai_maxdata = 0x0fff,
205 .ao_maxdata = 0x0fff,
208 .ai_maxdata = 0x0fff,
213 .ao_maxdata = 0x0fff,
216 .ai_maxdata = 0x0fff,
221 .ao_maxdata = 0x0fff,
224 .ai_maxdata = 0xffff,
228 .ao_maxdata = 0xffff,
230 .name = "dt2824-pgh",
231 .ai_maxdata = 0x0fff,
236 .name = "dt2824-pgl",
237 .ai_maxdata = 0x0fff,
244 .ai_maxdata = 0x0fff,
250 .ao_maxdata = 0x0fff,
253 .ai_maxdata = 0xffff,
257 .ao_maxdata = 0x0fff,
260 .ai_maxdata = 0x0fff,
264 .ao_maxdata = 0x0fff,
267 .ai_maxdata = 0xffff,
271 .ao_maxdata = 0xffff,
274 .ai_maxdata = 0x0fff,
279 .ao_maxdata = 0x0fff,
282 .ai_maxdata = 0xffff,
288 .ai_maxdata = 0x0fff,
293 .name = "dt24-ez-pgl",
294 .ai_maxdata = 0x0fff,
302 struct dt282x_private {
303 struct comedi_isadma *dma;
304 unsigned int ad_2scomp:1;
305 unsigned int divisor;
306 int dacsr; /* software copies of registers */
314 static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
316 struct dt282x_private *devpriv = dev->private;
317 struct comedi_isadma *dma = devpriv->dma;
318 struct comedi_isadma_desc *desc = &dma->desc[dma_index];
325 if (n > devpriv->ntrig * 2)
326 n = devpriv->ntrig * 2;
327 devpriv->ntrig -= n / 2;
330 comedi_isadma_set_mode(desc, devpriv->dma_dir);
332 comedi_isadma_program(desc);
337 static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
339 struct dt282x_private *devpriv = dev->private;
340 struct comedi_isadma *dma = devpriv->dma;
341 struct comedi_isadma_desc *desc = &dma->desc[dma_index];
344 comedi_isadma_set_mode(desc, devpriv->dma_dir);
346 comedi_isadma_program(desc);
351 static void dt282x_disable_dma(struct comedi_device *dev)
353 struct dt282x_private *devpriv = dev->private;
354 struct comedi_isadma *dma = devpriv->dma;
355 struct comedi_isadma_desc *desc;
358 for (i = 0; i < 2; i++) {
359 desc = &dma->desc[i];
360 comedi_isadma_disable(desc->chan);
364 static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags)
366 unsigned int prescale, base, divider;
368 for (prescale = 0; prescale < 16; prescale++) {
371 base = 250 * (1 << prescale);
372 switch (flags & CMDF_ROUND_MASK) {
373 case CMDF_ROUND_NEAREST:
375 divider = (*ns + base / 2) / base;
377 case CMDF_ROUND_DOWN:
378 divider = (*ns) / base;
381 divider = (*ns + base - 1) / base;
385 *ns = divider * base;
386 return (prescale << 8) | (255 - divider);
389 base = 250 * (1 << 15);
391 *ns = divider * base;
392 return (15 << 8) | (255 - divider);
395 static void dt282x_munge(struct comedi_device *dev,
396 struct comedi_subdevice *s,
400 struct dt282x_private *devpriv = dev->private;
405 dev_err(dev->class_dev,
406 "bug! odd number of bytes from dma xfer\n");
408 for (i = 0; i < nbytes / 2; i++) {
411 if (devpriv->ad_2scomp)
412 val = comedi_offset_munge(s, val);
418 static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev,
419 struct comedi_subdevice *s,
422 struct dt282x_private *devpriv = dev->private;
423 struct comedi_isadma *dma = devpriv->dma;
424 struct comedi_isadma_desc *desc = &dma->desc[cur_dma];
425 unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize);
428 nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples);
430 dt282x_prep_ao_dma(dev, cur_dma, nbytes);
432 dev_err(dev->class_dev, "AO underrun\n");
437 static void dt282x_ao_dma_interrupt(struct comedi_device *dev,
438 struct comedi_subdevice *s)
440 struct dt282x_private *devpriv = dev->private;
441 struct comedi_isadma *dma = devpriv->dma;
442 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
444 outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
445 dev->iobase + DT2821_SUPCSR_REG);
447 comedi_isadma_disable(desc->chan);
449 if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma))
450 s->async->events |= COMEDI_CB_OVERFLOW;
452 dma->cur_dma = 1 - dma->cur_dma;
455 static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
456 struct comedi_subdevice *s)
458 struct dt282x_private *devpriv = dev->private;
459 struct comedi_isadma *dma = devpriv->dma;
460 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
461 unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
464 outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
465 dev->iobase + DT2821_SUPCSR_REG);
467 comedi_isadma_disable(desc->chan);
469 dt282x_munge(dev, s, desc->virt_addr, desc->size);
470 ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples);
471 if (ret != desc->size)
474 devpriv->nread -= nsamples;
475 if (devpriv->nread < 0) {
476 dev_info(dev->class_dev, "nread off by one\n");
479 if (!devpriv->nread) {
480 s->async->events |= COMEDI_CB_EOA;
484 /* clear the dual dma flag, making this the last dma segment */
485 /* XXX probably wrong */
486 if (!devpriv->ntrig) {
487 devpriv->supcsr &= ~DT2821_SUPCSR_DDMA;
488 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
491 /* restart the channel */
492 dt282x_prep_ai_dma(dev, dma->cur_dma, 0);
494 dma->cur_dma = 1 - dma->cur_dma;
497 static irqreturn_t dt282x_interrupt(int irq, void *d)
499 struct comedi_device *dev = d;
500 struct dt282x_private *devpriv = dev->private;
501 struct comedi_subdevice *s = dev->read_subdev;
502 struct comedi_subdevice *s_ao = dev->write_subdev;
503 unsigned int supcsr, adcsr, dacsr;
506 if (!dev->attached) {
507 dev_err(dev->class_dev, "spurious interrupt\n");
511 adcsr = inw(dev->iobase + DT2821_ADCSR_REG);
512 dacsr = inw(dev->iobase + DT2821_DACSR_REG);
513 supcsr = inw(dev->iobase + DT2821_SUPCSR_REG);
514 if (supcsr & DT2821_SUPCSR_DMAD) {
515 if (devpriv->dma_dir == COMEDI_ISADMA_READ)
516 dt282x_ai_dma_interrupt(dev, s);
518 dt282x_ao_dma_interrupt(dev, s_ao);
521 if (adcsr & DT2821_ADCSR_ADERR) {
522 if (devpriv->nread != 0) {
523 dev_err(dev->class_dev, "A/D error\n");
524 s->async->events |= COMEDI_CB_ERROR;
528 if (dacsr & DT2821_DACSR_DAERR) {
529 dev_err(dev->class_dev, "D/A error\n");
530 s_ao->async->events |= COMEDI_CB_ERROR;
534 if (adcsr & DT2821_ADCSR_ADDONE) {
537 data = inw(dev->iobase + DT2821_ADDAT_REG);
539 if (devpriv->ad_2scomp)
540 data = comedi_offset_munge(s, data);
542 comedi_buf_write_samples(s, &data, 1);
545 if (!devpriv->nread) {
546 s->async->events |= COMEDI_CB_EOA;
548 if (supcsr & DT2821_SUPCSR_SCDN)
549 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
550 dev->iobase + DT2821_SUPCSR_REG);
555 comedi_handle_events(dev, s);
557 comedi_handle_events(dev, s_ao);
559 return IRQ_RETVAL(handled);
562 static void dt282x_load_changain(struct comedi_device *dev, int n,
563 unsigned int *chanlist)
565 struct dt282x_private *devpriv = dev->private;
568 outw(DT2821_CHANCSR_LLE | DT2821_CHANCSR_NUMB(n),
569 dev->iobase + DT2821_CHANCSR_REG);
570 for (i = 0; i < n; i++) {
571 unsigned int chan = CR_CHAN(chanlist[i]);
572 unsigned int range = CR_RANGE(chanlist[i]);
574 outw(devpriv->adcsr |
575 DT2821_ADCSR_GS(range) |
576 DT2821_ADCSR_CHAN(chan),
577 dev->iobase + DT2821_ADCSR_REG);
579 outw(DT2821_CHANCSR_NUMB(n), dev->iobase + DT2821_CHANCSR_REG);
582 static int dt282x_ai_timeout(struct comedi_device *dev,
583 struct comedi_subdevice *s,
584 struct comedi_insn *insn,
585 unsigned long context)
589 status = inw(dev->iobase + DT2821_ADCSR_REG);
591 case DT2821_ADCSR_MUXBUSY:
592 if ((status & DT2821_ADCSR_MUXBUSY) == 0)
595 case DT2821_ADCSR_ADDONE:
596 if (status & DT2821_ADCSR_ADDONE)
606 * Performs a single A/D conversion.
607 * - Put channel/gain into channel-gain list
608 * - preload multiplexer
609 * - trigger conversion and wait for it to finish
611 static int dt282x_ai_insn_read(struct comedi_device *dev,
612 struct comedi_subdevice *s,
613 struct comedi_insn *insn,
616 struct dt282x_private *devpriv = dev->private;
621 /* XXX should we really be enabling the ad clock here? */
622 devpriv->adcsr = DT2821_ADCSR_ADCLK;
623 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
625 dt282x_load_changain(dev, 1, &insn->chanspec);
627 outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
628 dev->iobase + DT2821_SUPCSR_REG);
629 ret = comedi_timeout(dev, s, insn,
630 dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
634 for (i = 0; i < insn->n; i++) {
635 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
636 dev->iobase + DT2821_SUPCSR_REG);
638 ret = comedi_timeout(dev, s, insn,
639 dt282x_ai_timeout, DT2821_ADCSR_ADDONE);
643 val = inw(dev->iobase + DT2821_ADDAT_REG);
645 if (devpriv->ad_2scomp)
646 val = comedi_offset_munge(s, val);
654 static int dt282x_ai_cmdtest(struct comedi_device *dev,
655 struct comedi_subdevice *s,
656 struct comedi_cmd *cmd)
658 const struct dt282x_board *board = dev->board_ptr;
659 struct dt282x_private *devpriv = dev->private;
663 /* Step 1 : check if triggers are trivially valid */
665 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
666 err |= comedi_check_trigger_src(&cmd->scan_begin_src,
667 TRIG_FOLLOW | TRIG_EXT);
668 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
669 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
670 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
675 /* Step 2a : make sure trigger sources are unique */
677 err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
678 err |= comedi_check_trigger_is_unique(cmd->stop_src);
680 /* Step 2b : and mutually compatible */
685 /* Step 3: check if arguments are trivially valid */
687 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
689 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
691 err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 4000);
693 #define SLOWEST_TIMER (250*(1<<15)*255)
694 err |= comedi_check_trigger_arg_max(&cmd->convert_arg, SLOWEST_TIMER);
695 err |= comedi_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed);
696 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
699 if (cmd->stop_src == TRIG_COUNT)
700 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
701 else /* TRIG_EXT | TRIG_NONE */
702 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
707 /* step 4: fix up any arguments */
709 arg = cmd->convert_arg;
710 devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
711 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
719 static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
721 struct dt282x_private *devpriv = dev->private;
722 struct comedi_isadma *dma = devpriv->dma;
723 struct comedi_cmd *cmd = &s->async->cmd;
726 dt282x_disable_dma(dev);
728 outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
730 devpriv->supcsr = DT2821_SUPCSR_ERRINTEN;
731 if (cmd->scan_begin_src == TRIG_FOLLOW)
732 devpriv->supcsr = DT2821_SUPCSR_DS_AD_CLK;
734 devpriv->supcsr = DT2821_SUPCSR_DS_AD_TRIG;
735 outw(devpriv->supcsr |
736 DT2821_SUPCSR_CLRDMADNE |
737 DT2821_SUPCSR_BUFFB |
738 DT2821_SUPCSR_ADCINIT,
739 dev->iobase + DT2821_SUPCSR_REG);
741 devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
742 devpriv->nread = devpriv->ntrig;
744 devpriv->dma_dir = COMEDI_ISADMA_READ;
746 dt282x_prep_ai_dma(dev, 0, 0);
747 if (devpriv->ntrig) {
748 dt282x_prep_ai_dma(dev, 1, 0);
749 devpriv->supcsr |= DT2821_SUPCSR_DDMA;
750 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
755 dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
757 devpriv->adcsr = DT2821_ADCSR_ADCLK | DT2821_ADCSR_IADDONE;
758 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
760 outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
761 dev->iobase + DT2821_SUPCSR_REG);
762 ret = comedi_timeout(dev, s, NULL,
763 dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
767 if (cmd->scan_begin_src == TRIG_FOLLOW) {
768 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
769 dev->iobase + DT2821_SUPCSR_REG);
771 devpriv->supcsr |= DT2821_SUPCSR_XTRIG;
772 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
778 static int dt282x_ai_cancel(struct comedi_device *dev,
779 struct comedi_subdevice *s)
781 struct dt282x_private *devpriv = dev->private;
783 dt282x_disable_dma(dev);
786 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
789 outw(devpriv->supcsr | DT2821_SUPCSR_ADCINIT,
790 dev->iobase + DT2821_SUPCSR_REG);
795 static int dt282x_ao_insn_write(struct comedi_device *dev,
796 struct comedi_subdevice *s,
797 struct comedi_insn *insn,
800 struct dt282x_private *devpriv = dev->private;
801 unsigned int chan = CR_CHAN(insn->chanspec);
802 unsigned int range = CR_RANGE(insn->chanspec);
805 devpriv->dacsr |= DT2821_DACSR_SSEL | DT2821_DACSR_YSEL(chan);
807 for (i = 0; i < insn->n; i++) {
808 unsigned int val = data[i];
810 s->readback[chan] = val;
812 if (comedi_range_is_bipolar(s, range))
813 val = comedi_offset_munge(s, val);
815 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
817 outw(val, dev->iobase + DT2821_DADAT_REG);
819 outw(devpriv->supcsr | DT2821_SUPCSR_DACON,
820 dev->iobase + DT2821_SUPCSR_REG);
826 static int dt282x_ao_cmdtest(struct comedi_device *dev,
827 struct comedi_subdevice *s,
828 struct comedi_cmd *cmd)
830 struct dt282x_private *devpriv = dev->private;
834 /* Step 1 : check if triggers are trivially valid */
836 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
837 err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
838 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
839 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
840 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
845 /* Step 2a : make sure trigger sources are unique */
847 err |= comedi_check_trigger_is_unique(cmd->stop_src);
849 /* Step 2b : and mutually compatible */
854 /* Step 3: check if arguments are trivially valid */
856 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
857 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 5000);
858 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
859 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
862 if (cmd->stop_src == TRIG_COUNT)
863 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
864 else /* TRIG_EXT | TRIG_NONE */
865 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
870 /* step 4: fix up any arguments */
872 arg = cmd->scan_begin_arg;
873 devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
874 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
882 static int dt282x_ao_inttrig(struct comedi_device *dev,
883 struct comedi_subdevice *s,
884 unsigned int trig_num)
886 struct dt282x_private *devpriv = dev->private;
887 struct comedi_cmd *cmd = &s->async->cmd;
889 if (trig_num != cmd->start_src)
892 if (!dt282x_ao_setup_dma(dev, s, 0))
895 if (!dt282x_ao_setup_dma(dev, s, 1))
898 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
899 dev->iobase + DT2821_SUPCSR_REG);
900 s->async->inttrig = NULL;
905 static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
907 struct dt282x_private *devpriv = dev->private;
908 struct comedi_isadma *dma = devpriv->dma;
909 struct comedi_cmd *cmd = &s->async->cmd;
911 dt282x_disable_dma(dev);
913 devpriv->supcsr = DT2821_SUPCSR_ERRINTEN |
914 DT2821_SUPCSR_DS_DA_CLK |
916 outw(devpriv->supcsr |
917 DT2821_SUPCSR_CLRDMADNE |
918 DT2821_SUPCSR_BUFFB |
919 DT2821_SUPCSR_DACINIT,
920 dev->iobase + DT2821_SUPCSR_REG);
922 devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
923 devpriv->nread = devpriv->ntrig;
925 devpriv->dma_dir = COMEDI_ISADMA_WRITE;
928 outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
930 /* clear all bits but the DIO direction bits */
931 devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
933 devpriv->dacsr |= (DT2821_DACSR_SSEL |
935 DT2821_DACSR_IDARDY);
936 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
938 s->async->inttrig = dt282x_ao_inttrig;
943 static int dt282x_ao_cancel(struct comedi_device *dev,
944 struct comedi_subdevice *s)
946 struct dt282x_private *devpriv = dev->private;
948 dt282x_disable_dma(dev);
950 /* clear all bits but the DIO direction bits */
951 devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
953 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
956 outw(devpriv->supcsr | DT2821_SUPCSR_DACINIT,
957 dev->iobase + DT2821_SUPCSR_REG);
962 static int dt282x_dio_insn_bits(struct comedi_device *dev,
963 struct comedi_subdevice *s,
964 struct comedi_insn *insn,
967 if (comedi_dio_update_state(s, data))
968 outw(s->state, dev->iobase + DT2821_DIODAT_REG);
970 data[1] = inw(dev->iobase + DT2821_DIODAT_REG);
975 static int dt282x_dio_insn_config(struct comedi_device *dev,
976 struct comedi_subdevice *s,
977 struct comedi_insn *insn,
980 struct dt282x_private *devpriv = dev->private;
981 unsigned int chan = CR_CHAN(insn->chanspec);
990 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
994 devpriv->dacsr &= ~(DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
995 if (s->io_bits & 0x00ff)
996 devpriv->dacsr |= DT2821_DACSR_LBOE;
997 if (s->io_bits & 0xff00)
998 devpriv->dacsr |= DT2821_DACSR_HBOE;
1000 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
1005 static const struct comedi_lrange *const ai_range_table[] = {
1006 &range_dt282x_ai_lo_bipolar,
1007 &range_dt282x_ai_lo_unipolar,
1008 &range_dt282x_ai_5_bipolar,
1009 &range_dt282x_ai_5_unipolar
1012 static const struct comedi_lrange *const ai_range_pgl_table[] = {
1013 &range_dt282x_ai_hi_bipolar,
1014 &range_dt282x_ai_hi_unipolar
1017 static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
1020 if (x < 0 || x >= 2)
1022 return ai_range_pgl_table[x];
1025 if (x < 0 || x >= 4)
1027 return ai_range_table[x];
1030 static void dt282x_alloc_dma(struct comedi_device *dev,
1031 struct comedi_devconfig *it)
1033 struct dt282x_private *devpriv = dev->private;
1034 unsigned int irq_num = it->options[1];
1035 unsigned int dma_chan[2];
1037 if (it->options[2] < it->options[3]) {
1038 dma_chan[0] = it->options[2];
1039 dma_chan[1] = it->options[3];
1041 dma_chan[0] = it->options[3];
1042 dma_chan[1] = it->options[2];
1045 if (!irq_num || dma_chan[0] == dma_chan[1] ||
1046 dma_chan[0] < 5 || dma_chan[0] > 7 ||
1047 dma_chan[1] < 5 || dma_chan[1] > 7)
1050 if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev))
1053 /* DMA uses two 4K buffers with separate DMA channels */
1054 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1],
1057 free_irq(irq_num, dev);
1060 static void dt282x_free_dma(struct comedi_device *dev)
1062 struct dt282x_private *devpriv = dev->private;
1065 comedi_isadma_free(devpriv->dma);
1068 static int dt282x_initialize(struct comedi_device *dev)
1070 /* Initialize board */
1071 outw(DT2821_SUPCSR_BDINIT, dev->iobase + DT2821_SUPCSR_REG);
1072 inw(dev->iobase + DT2821_ADCSR_REG);
1075 * At power up, some registers are in a well-known state.
1076 * Check them to see if a DT2821 series board is present.
1078 if (((inw(dev->iobase + DT2821_ADCSR_REG) & 0xfff0) != 0x7c00) ||
1079 ((inw(dev->iobase + DT2821_CHANCSR_REG) & 0xf0f0) != 0x70f0) ||
1080 ((inw(dev->iobase + DT2821_DACSR_REG) & 0x7c93) != 0x7c90) ||
1081 ((inw(dev->iobase + DT2821_SUPCSR_REG) & 0xf8ff) != 0x0000) ||
1082 ((inw(dev->iobase + DT2821_TMRCTR_REG) & 0xff00) != 0xf000)) {
1083 dev_err(dev->class_dev, "board not found\n");
1095 4 0=single ended, 1=differential
1096 5 ai 0=straight binary, 1=2's comp
1097 6 ao0 0=straight binary, 1=2's comp
1098 7 ao1 0=straight binary, 1=2's comp
1099 8 ai 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V
1100 9 ao0 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
1101 10 ao1 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
1103 static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1105 const struct dt282x_board *board = dev->board_ptr;
1106 struct dt282x_private *devpriv;
1107 struct comedi_subdevice *s;
1110 ret = comedi_request_region(dev, it->options[0], 0x10);
1114 ret = dt282x_initialize(dev);
1118 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1122 /* an IRQ and 2 DMA channels are required for async command support */
1123 dt282x_alloc_dma(dev, it);
1125 ret = comedi_alloc_subdevices(dev, 3);
1129 /* Analog Input subdevice */
1130 s = &dev->subdevices[0];
1131 s->type = COMEDI_SUBD_AI;
1132 s->subdev_flags = SDF_READABLE;
1133 if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) {
1134 s->subdev_flags |= SDF_DIFF;
1135 s->n_chan = board->adchan_di;
1137 s->subdev_flags |= SDF_COMMON;
1138 s->n_chan = board->adchan_se;
1140 s->maxdata = board->ai_maxdata;
1142 s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]);
1143 devpriv->ad_2scomp = it->options[5] ? 1 : 0;
1145 s->insn_read = dt282x_ai_insn_read;
1147 dev->read_subdev = s;
1148 s->subdev_flags |= SDF_CMD_READ;
1149 s->len_chanlist = s->n_chan;
1150 s->do_cmdtest = dt282x_ai_cmdtest;
1151 s->do_cmd = dt282x_ai_cmd;
1152 s->cancel = dt282x_ai_cancel;
1155 /* Analog Output subdevice */
1156 s = &dev->subdevices[1];
1157 if (board->dachan) {
1158 s->type = COMEDI_SUBD_AO;
1159 s->subdev_flags = SDF_WRITABLE;
1160 s->n_chan = board->dachan;
1161 s->maxdata = board->ao_maxdata;
1162 /* ranges are per-channel, set by jumpers on the board */
1163 s->range_table = &dt282x_ao_range;
1164 s->insn_write = dt282x_ao_insn_write;
1166 dev->write_subdev = s;
1167 s->subdev_flags |= SDF_CMD_WRITE;
1168 s->len_chanlist = s->n_chan;
1169 s->do_cmdtest = dt282x_ao_cmdtest;
1170 s->do_cmd = dt282x_ao_cmd;
1171 s->cancel = dt282x_ao_cancel;
1174 ret = comedi_alloc_subdev_readback(s);
1178 s->type = COMEDI_SUBD_UNUSED;
1181 /* Digital I/O subdevice */
1182 s = &dev->subdevices[2];
1183 s->type = COMEDI_SUBD_DIO;
1184 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
1187 s->range_table = &range_digital;
1188 s->insn_bits = dt282x_dio_insn_bits;
1189 s->insn_config = dt282x_dio_insn_config;
1194 static void dt282x_detach(struct comedi_device *dev)
1196 dt282x_free_dma(dev);
1197 comedi_legacy_detach(dev);
1200 static struct comedi_driver dt282x_driver = {
1201 .driver_name = "dt282x",
1202 .module = THIS_MODULE,
1203 .attach = dt282x_attach,
1204 .detach = dt282x_detach,
1205 .board_name = &boardtypes[0].name,
1206 .num_names = ARRAY_SIZE(boardtypes),
1207 .offset = sizeof(struct dt282x_board),
1209 module_comedi_driver(dt282x_driver);
1211 MODULE_AUTHOR("Comedi http://www.comedi.org");
1212 MODULE_DESCRIPTION("Comedi driver for Data Translation DT2821 series");
1213 MODULE_LICENSE("GPL");