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
116 #define DT2821_TMRCTR_PRESCALE(x) (((x) & 0xf) << 8)
117 #define DT2821_TMRCTR_DIVIDER(x) ((255 - ((x) & 0xff)) << 0)
120 #define DT2821_OSC_BASE 250 /* 4 MHz (in nanoseconds) */
121 #define DT2821_PRESCALE(x) BIT(x)
122 #define DT2821_PRESCALE_MAX 15
123 #define DT2821_DIVIDER_MAX 255
124 #define DT2821_OSC_MAX (DT2821_OSC_BASE * \
125 DT2821_PRESCALE(DT2821_PRESCALE_MAX) * \
128 static const struct comedi_lrange range_dt282x_ai_lo_bipolar = {
137 static const struct comedi_lrange range_dt282x_ai_lo_unipolar = {
146 static const struct comedi_lrange range_dt282x_ai_5_bipolar = {
155 static const struct comedi_lrange range_dt282x_ai_5_unipolar = {
164 static const struct comedi_lrange range_dt282x_ai_hi_bipolar = {
173 static const struct comedi_lrange range_dt282x_ai_hi_unipolar = {
183 * The Analog Output range is set per-channel using jumpers on the board.
184 * All of these ranges may not be available on some DT2821 series boards.
185 * The default jumper setting has both channels set for +/-10V output.
187 static const struct comedi_lrange dt282x_ao_range = {
197 struct dt282x_board {
199 unsigned int ai_maxdata;
205 unsigned int ao_maxdata;
208 static const struct dt282x_board boardtypes[] = {
211 .ai_maxdata = 0x0fff,
216 .ao_maxdata = 0x0fff,
219 .ai_maxdata = 0x0fff,
224 .ao_maxdata = 0x0fff,
227 .ai_maxdata = 0x0fff,
232 .ao_maxdata = 0x0fff,
235 .ai_maxdata = 0xffff,
239 .ao_maxdata = 0xffff,
241 .name = "dt2824-pgh",
242 .ai_maxdata = 0x0fff,
247 .name = "dt2824-pgl",
248 .ai_maxdata = 0x0fff,
255 .ai_maxdata = 0x0fff,
261 .ao_maxdata = 0x0fff,
264 .ai_maxdata = 0xffff,
268 .ao_maxdata = 0x0fff,
271 .ai_maxdata = 0x0fff,
275 .ao_maxdata = 0x0fff,
278 .ai_maxdata = 0xffff,
282 .ao_maxdata = 0xffff,
285 .ai_maxdata = 0x0fff,
290 .ao_maxdata = 0x0fff,
293 .ai_maxdata = 0xffff,
299 .ai_maxdata = 0x0fff,
304 .name = "dt24-ez-pgl",
305 .ai_maxdata = 0x0fff,
313 struct dt282x_private {
314 struct comedi_isadma *dma;
315 unsigned int ad_2scomp:1;
316 unsigned int divisor;
317 int dacsr; /* software copies of registers */
325 static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
327 struct dt282x_private *devpriv = dev->private;
328 struct comedi_isadma *dma = devpriv->dma;
329 struct comedi_isadma_desc *desc = &dma->desc[dma_index];
336 if (n > devpriv->ntrig * 2)
337 n = devpriv->ntrig * 2;
338 devpriv->ntrig -= n / 2;
341 comedi_isadma_set_mode(desc, devpriv->dma_dir);
343 comedi_isadma_program(desc);
348 static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
350 struct dt282x_private *devpriv = dev->private;
351 struct comedi_isadma *dma = devpriv->dma;
352 struct comedi_isadma_desc *desc = &dma->desc[dma_index];
355 comedi_isadma_set_mode(desc, devpriv->dma_dir);
357 comedi_isadma_program(desc);
362 static void dt282x_disable_dma(struct comedi_device *dev)
364 struct dt282x_private *devpriv = dev->private;
365 struct comedi_isadma *dma = devpriv->dma;
366 struct comedi_isadma_desc *desc;
369 for (i = 0; i < 2; i++) {
370 desc = &dma->desc[i];
371 comedi_isadma_disable(desc->chan);
375 static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags)
377 unsigned int prescale, base, divider;
379 for (prescale = 0; prescale <= DT2821_PRESCALE_MAX; prescale++) {
380 if (prescale == 1) /* 0 and 1 are both divide by 1 */
382 base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale);
383 switch (flags & CMDF_ROUND_MASK) {
384 case CMDF_ROUND_NEAREST:
386 divider = DIV_ROUND_CLOSEST(*ns, base);
388 case CMDF_ROUND_DOWN:
389 divider = (*ns) / base;
392 divider = DIV_ROUND_UP(*ns, base);
395 if (divider <= DT2821_DIVIDER_MAX)
398 if (divider > DT2821_DIVIDER_MAX) {
399 prescale = DT2821_PRESCALE_MAX;
400 divider = DT2821_DIVIDER_MAX;
401 base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale);
403 *ns = divider * base;
404 return DT2821_TMRCTR_PRESCALE(prescale) |
405 DT2821_TMRCTR_DIVIDER(divider);
408 static void dt282x_munge(struct comedi_device *dev,
409 struct comedi_subdevice *s,
413 struct dt282x_private *devpriv = dev->private;
418 dev_err(dev->class_dev,
419 "bug! odd number of bytes from dma xfer\n");
421 for (i = 0; i < nbytes / 2; i++) {
424 if (devpriv->ad_2scomp)
425 val = comedi_offset_munge(s, val);
431 static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev,
432 struct comedi_subdevice *s,
435 struct dt282x_private *devpriv = dev->private;
436 struct comedi_isadma *dma = devpriv->dma;
437 struct comedi_isadma_desc *desc = &dma->desc[cur_dma];
438 unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize);
441 nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples);
443 dt282x_prep_ao_dma(dev, cur_dma, nbytes);
445 dev_err(dev->class_dev, "AO underrun\n");
450 static void dt282x_ao_dma_interrupt(struct comedi_device *dev,
451 struct comedi_subdevice *s)
453 struct dt282x_private *devpriv = dev->private;
454 struct comedi_isadma *dma = devpriv->dma;
455 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
457 outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
458 dev->iobase + DT2821_SUPCSR_REG);
460 comedi_isadma_disable(desc->chan);
462 if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma))
463 s->async->events |= COMEDI_CB_OVERFLOW;
465 dma->cur_dma = 1 - dma->cur_dma;
468 static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
469 struct comedi_subdevice *s)
471 struct dt282x_private *devpriv = dev->private;
472 struct comedi_isadma *dma = devpriv->dma;
473 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
474 unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
477 outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
478 dev->iobase + DT2821_SUPCSR_REG);
480 comedi_isadma_disable(desc->chan);
482 dt282x_munge(dev, s, desc->virt_addr, desc->size);
483 ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples);
484 if (ret != desc->size)
487 devpriv->nread -= nsamples;
488 if (devpriv->nread < 0) {
489 dev_info(dev->class_dev, "nread off by one\n");
492 if (!devpriv->nread) {
493 s->async->events |= COMEDI_CB_EOA;
497 /* clear the dual dma flag, making this the last dma segment */
498 /* XXX probably wrong */
499 if (!devpriv->ntrig) {
500 devpriv->supcsr &= ~DT2821_SUPCSR_DDMA;
501 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
504 /* restart the channel */
505 dt282x_prep_ai_dma(dev, dma->cur_dma, 0);
507 dma->cur_dma = 1 - dma->cur_dma;
510 static irqreturn_t dt282x_interrupt(int irq, void *d)
512 struct comedi_device *dev = d;
513 struct dt282x_private *devpriv = dev->private;
514 struct comedi_subdevice *s = dev->read_subdev;
515 struct comedi_subdevice *s_ao = dev->write_subdev;
516 unsigned int supcsr, adcsr, dacsr;
519 if (!dev->attached) {
520 dev_err(dev->class_dev, "spurious interrupt\n");
524 adcsr = inw(dev->iobase + DT2821_ADCSR_REG);
525 dacsr = inw(dev->iobase + DT2821_DACSR_REG);
526 supcsr = inw(dev->iobase + DT2821_SUPCSR_REG);
527 if (supcsr & DT2821_SUPCSR_DMAD) {
528 if (devpriv->dma_dir == COMEDI_ISADMA_READ)
529 dt282x_ai_dma_interrupt(dev, s);
531 dt282x_ao_dma_interrupt(dev, s_ao);
534 if (adcsr & DT2821_ADCSR_ADERR) {
535 if (devpriv->nread != 0) {
536 dev_err(dev->class_dev, "A/D error\n");
537 s->async->events |= COMEDI_CB_ERROR;
541 if (dacsr & DT2821_DACSR_DAERR) {
542 dev_err(dev->class_dev, "D/A error\n");
543 s_ao->async->events |= COMEDI_CB_ERROR;
547 if (adcsr & DT2821_ADCSR_ADDONE) {
550 data = inw(dev->iobase + DT2821_ADDAT_REG);
552 if (devpriv->ad_2scomp)
553 data = comedi_offset_munge(s, data);
555 comedi_buf_write_samples(s, &data, 1);
558 if (!devpriv->nread) {
559 s->async->events |= COMEDI_CB_EOA;
561 if (supcsr & DT2821_SUPCSR_SCDN)
562 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
563 dev->iobase + DT2821_SUPCSR_REG);
568 comedi_handle_events(dev, s);
570 comedi_handle_events(dev, s_ao);
572 return IRQ_RETVAL(handled);
575 static void dt282x_load_changain(struct comedi_device *dev, int n,
576 unsigned int *chanlist)
578 struct dt282x_private *devpriv = dev->private;
581 outw(DT2821_CHANCSR_LLE | DT2821_CHANCSR_NUMB(n),
582 dev->iobase + DT2821_CHANCSR_REG);
583 for (i = 0; i < n; i++) {
584 unsigned int chan = CR_CHAN(chanlist[i]);
585 unsigned int range = CR_RANGE(chanlist[i]);
587 outw(devpriv->adcsr |
588 DT2821_ADCSR_GS(range) |
589 DT2821_ADCSR_CHAN(chan),
590 dev->iobase + DT2821_ADCSR_REG);
592 outw(DT2821_CHANCSR_NUMB(n), dev->iobase + DT2821_CHANCSR_REG);
595 static int dt282x_ai_timeout(struct comedi_device *dev,
596 struct comedi_subdevice *s,
597 struct comedi_insn *insn,
598 unsigned long context)
602 status = inw(dev->iobase + DT2821_ADCSR_REG);
604 case DT2821_ADCSR_MUXBUSY:
605 if ((status & DT2821_ADCSR_MUXBUSY) == 0)
608 case DT2821_ADCSR_ADDONE:
609 if (status & DT2821_ADCSR_ADDONE)
619 * Performs a single A/D conversion.
620 * - Put channel/gain into channel-gain list
621 * - preload multiplexer
622 * - trigger conversion and wait for it to finish
624 static int dt282x_ai_insn_read(struct comedi_device *dev,
625 struct comedi_subdevice *s,
626 struct comedi_insn *insn,
629 struct dt282x_private *devpriv = dev->private;
634 /* XXX should we really be enabling the ad clock here? */
635 devpriv->adcsr = DT2821_ADCSR_ADCLK;
636 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
638 dt282x_load_changain(dev, 1, &insn->chanspec);
640 outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
641 dev->iobase + DT2821_SUPCSR_REG);
642 ret = comedi_timeout(dev, s, insn,
643 dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
647 for (i = 0; i < insn->n; i++) {
648 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
649 dev->iobase + DT2821_SUPCSR_REG);
651 ret = comedi_timeout(dev, s, insn,
652 dt282x_ai_timeout, DT2821_ADCSR_ADDONE);
656 val = inw(dev->iobase + DT2821_ADDAT_REG);
658 if (devpriv->ad_2scomp)
659 val = comedi_offset_munge(s, val);
667 static int dt282x_ai_cmdtest(struct comedi_device *dev,
668 struct comedi_subdevice *s,
669 struct comedi_cmd *cmd)
671 const struct dt282x_board *board = dev->board_ptr;
672 struct dt282x_private *devpriv = dev->private;
676 /* Step 1 : check if triggers are trivially valid */
678 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
679 err |= comedi_check_trigger_src(&cmd->scan_begin_src,
680 TRIG_FOLLOW | TRIG_EXT);
681 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
682 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
683 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
688 /* Step 2a : make sure trigger sources are unique */
690 err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
691 err |= comedi_check_trigger_is_unique(cmd->stop_src);
693 /* Step 2b : and mutually compatible */
698 /* Step 3: check if arguments are trivially valid */
700 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
701 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
702 err |= comedi_check_trigger_arg_max(&cmd->convert_arg, DT2821_OSC_MAX);
703 err |= comedi_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed);
704 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
707 if (cmd->stop_src == TRIG_COUNT)
708 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
709 else /* TRIG_EXT | TRIG_NONE */
710 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
715 /* step 4: fix up any arguments */
717 arg = cmd->convert_arg;
718 devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
719 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
727 static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
729 struct dt282x_private *devpriv = dev->private;
730 struct comedi_isadma *dma = devpriv->dma;
731 struct comedi_cmd *cmd = &s->async->cmd;
734 dt282x_disable_dma(dev);
736 outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
738 devpriv->supcsr = DT2821_SUPCSR_ERRINTEN;
739 if (cmd->scan_begin_src == TRIG_FOLLOW)
740 devpriv->supcsr = DT2821_SUPCSR_DS_AD_CLK;
742 devpriv->supcsr = DT2821_SUPCSR_DS_AD_TRIG;
743 outw(devpriv->supcsr |
744 DT2821_SUPCSR_CLRDMADNE |
745 DT2821_SUPCSR_BUFFB |
746 DT2821_SUPCSR_ADCINIT,
747 dev->iobase + DT2821_SUPCSR_REG);
749 devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
750 devpriv->nread = devpriv->ntrig;
752 devpriv->dma_dir = COMEDI_ISADMA_READ;
754 dt282x_prep_ai_dma(dev, 0, 0);
755 if (devpriv->ntrig) {
756 dt282x_prep_ai_dma(dev, 1, 0);
757 devpriv->supcsr |= DT2821_SUPCSR_DDMA;
758 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
763 dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
765 devpriv->adcsr = DT2821_ADCSR_ADCLK | DT2821_ADCSR_IADDONE;
766 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
768 outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
769 dev->iobase + DT2821_SUPCSR_REG);
770 ret = comedi_timeout(dev, s, NULL,
771 dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
775 if (cmd->scan_begin_src == TRIG_FOLLOW) {
776 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
777 dev->iobase + DT2821_SUPCSR_REG);
779 devpriv->supcsr |= DT2821_SUPCSR_XTRIG;
780 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
786 static int dt282x_ai_cancel(struct comedi_device *dev,
787 struct comedi_subdevice *s)
789 struct dt282x_private *devpriv = dev->private;
791 dt282x_disable_dma(dev);
794 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
797 outw(devpriv->supcsr | DT2821_SUPCSR_ADCINIT,
798 dev->iobase + DT2821_SUPCSR_REG);
803 static int dt282x_ao_insn_write(struct comedi_device *dev,
804 struct comedi_subdevice *s,
805 struct comedi_insn *insn,
808 struct dt282x_private *devpriv = dev->private;
809 unsigned int chan = CR_CHAN(insn->chanspec);
810 unsigned int range = CR_RANGE(insn->chanspec);
813 devpriv->dacsr |= DT2821_DACSR_SSEL | DT2821_DACSR_YSEL(chan);
815 for (i = 0; i < insn->n; i++) {
816 unsigned int val = data[i];
818 s->readback[chan] = val;
820 if (comedi_range_is_bipolar(s, range))
821 val = comedi_offset_munge(s, val);
823 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
825 outw(val, dev->iobase + DT2821_DADAT_REG);
827 outw(devpriv->supcsr | DT2821_SUPCSR_DACON,
828 dev->iobase + DT2821_SUPCSR_REG);
834 static int dt282x_ao_cmdtest(struct comedi_device *dev,
835 struct comedi_subdevice *s,
836 struct comedi_cmd *cmd)
838 struct dt282x_private *devpriv = dev->private;
842 /* Step 1 : check if triggers are trivially valid */
844 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
845 err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
846 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
847 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
848 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
853 /* Step 2a : make sure trigger sources are unique */
855 err |= comedi_check_trigger_is_unique(cmd->stop_src);
857 /* Step 2b : and mutually compatible */
862 /* Step 3: check if arguments are trivially valid */
864 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
865 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 5000);
866 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
867 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
870 if (cmd->stop_src == TRIG_COUNT)
871 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
872 else /* TRIG_EXT | TRIG_NONE */
873 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
878 /* step 4: fix up any arguments */
880 arg = cmd->scan_begin_arg;
881 devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
882 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
890 static int dt282x_ao_inttrig(struct comedi_device *dev,
891 struct comedi_subdevice *s,
892 unsigned int trig_num)
894 struct dt282x_private *devpriv = dev->private;
895 struct comedi_cmd *cmd = &s->async->cmd;
897 if (trig_num != cmd->start_src)
900 if (!dt282x_ao_setup_dma(dev, s, 0))
903 if (!dt282x_ao_setup_dma(dev, s, 1))
906 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
907 dev->iobase + DT2821_SUPCSR_REG);
908 s->async->inttrig = NULL;
913 static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
915 struct dt282x_private *devpriv = dev->private;
916 struct comedi_isadma *dma = devpriv->dma;
917 struct comedi_cmd *cmd = &s->async->cmd;
919 dt282x_disable_dma(dev);
921 devpriv->supcsr = DT2821_SUPCSR_ERRINTEN |
922 DT2821_SUPCSR_DS_DA_CLK |
924 outw(devpriv->supcsr |
925 DT2821_SUPCSR_CLRDMADNE |
926 DT2821_SUPCSR_BUFFB |
927 DT2821_SUPCSR_DACINIT,
928 dev->iobase + DT2821_SUPCSR_REG);
930 devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
931 devpriv->nread = devpriv->ntrig;
933 devpriv->dma_dir = COMEDI_ISADMA_WRITE;
936 outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
938 /* clear all bits but the DIO direction bits */
939 devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
941 devpriv->dacsr |= (DT2821_DACSR_SSEL |
943 DT2821_DACSR_IDARDY);
944 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
946 s->async->inttrig = dt282x_ao_inttrig;
951 static int dt282x_ao_cancel(struct comedi_device *dev,
952 struct comedi_subdevice *s)
954 struct dt282x_private *devpriv = dev->private;
956 dt282x_disable_dma(dev);
958 /* clear all bits but the DIO direction bits */
959 devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
961 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
964 outw(devpriv->supcsr | DT2821_SUPCSR_DACINIT,
965 dev->iobase + DT2821_SUPCSR_REG);
970 static int dt282x_dio_insn_bits(struct comedi_device *dev,
971 struct comedi_subdevice *s,
972 struct comedi_insn *insn,
975 if (comedi_dio_update_state(s, data))
976 outw(s->state, dev->iobase + DT2821_DIODAT_REG);
978 data[1] = inw(dev->iobase + DT2821_DIODAT_REG);
983 static int dt282x_dio_insn_config(struct comedi_device *dev,
984 struct comedi_subdevice *s,
985 struct comedi_insn *insn,
988 struct dt282x_private *devpriv = dev->private;
989 unsigned int chan = CR_CHAN(insn->chanspec);
998 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
1002 devpriv->dacsr &= ~(DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
1003 if (s->io_bits & 0x00ff)
1004 devpriv->dacsr |= DT2821_DACSR_LBOE;
1005 if (s->io_bits & 0xff00)
1006 devpriv->dacsr |= DT2821_DACSR_HBOE;
1008 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
1013 static const struct comedi_lrange *const ai_range_table[] = {
1014 &range_dt282x_ai_lo_bipolar,
1015 &range_dt282x_ai_lo_unipolar,
1016 &range_dt282x_ai_5_bipolar,
1017 &range_dt282x_ai_5_unipolar
1020 static const struct comedi_lrange *const ai_range_pgl_table[] = {
1021 &range_dt282x_ai_hi_bipolar,
1022 &range_dt282x_ai_hi_unipolar
1025 static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
1028 if (x < 0 || x >= 2)
1030 return ai_range_pgl_table[x];
1033 if (x < 0 || x >= 4)
1035 return ai_range_table[x];
1038 static void dt282x_alloc_dma(struct comedi_device *dev,
1039 struct comedi_devconfig *it)
1041 struct dt282x_private *devpriv = dev->private;
1042 unsigned int irq_num = it->options[1];
1043 unsigned int dma_chan[2];
1045 if (it->options[2] < it->options[3]) {
1046 dma_chan[0] = it->options[2];
1047 dma_chan[1] = it->options[3];
1049 dma_chan[0] = it->options[3];
1050 dma_chan[1] = it->options[2];
1053 if (!irq_num || dma_chan[0] == dma_chan[1] ||
1054 dma_chan[0] < 5 || dma_chan[0] > 7 ||
1055 dma_chan[1] < 5 || dma_chan[1] > 7)
1058 if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev))
1061 /* DMA uses two 4K buffers with separate DMA channels */
1062 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1],
1065 free_irq(irq_num, dev);
1068 static void dt282x_free_dma(struct comedi_device *dev)
1070 struct dt282x_private *devpriv = dev->private;
1073 comedi_isadma_free(devpriv->dma);
1076 static int dt282x_initialize(struct comedi_device *dev)
1078 /* Initialize board */
1079 outw(DT2821_SUPCSR_BDINIT, dev->iobase + DT2821_SUPCSR_REG);
1080 inw(dev->iobase + DT2821_ADCSR_REG);
1083 * At power up, some registers are in a well-known state.
1084 * Check them to see if a DT2821 series board is present.
1086 if (((inw(dev->iobase + DT2821_ADCSR_REG) & 0xfff0) != 0x7c00) ||
1087 ((inw(dev->iobase + DT2821_CHANCSR_REG) & 0xf0f0) != 0x70f0) ||
1088 ((inw(dev->iobase + DT2821_DACSR_REG) & 0x7c93) != 0x7c90) ||
1089 ((inw(dev->iobase + DT2821_SUPCSR_REG) & 0xf8ff) != 0x0000) ||
1090 ((inw(dev->iobase + DT2821_TMRCTR_REG) & 0xff00) != 0xf000)) {
1091 dev_err(dev->class_dev, "board not found\n");
1097 static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1099 const struct dt282x_board *board = dev->board_ptr;
1100 struct dt282x_private *devpriv;
1101 struct comedi_subdevice *s;
1104 ret = comedi_request_region(dev, it->options[0], 0x10);
1108 ret = dt282x_initialize(dev);
1112 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1116 /* an IRQ and 2 DMA channels are required for async command support */
1117 dt282x_alloc_dma(dev, it);
1119 ret = comedi_alloc_subdevices(dev, 3);
1123 /* Analog Input subdevice */
1124 s = &dev->subdevices[0];
1125 s->type = COMEDI_SUBD_AI;
1126 s->subdev_flags = SDF_READABLE;
1127 if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) {
1128 s->subdev_flags |= SDF_DIFF;
1129 s->n_chan = board->adchan_di;
1131 s->subdev_flags |= SDF_COMMON;
1132 s->n_chan = board->adchan_se;
1134 s->maxdata = board->ai_maxdata;
1136 s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]);
1137 devpriv->ad_2scomp = it->options[5] ? 1 : 0;
1139 s->insn_read = dt282x_ai_insn_read;
1141 dev->read_subdev = s;
1142 s->subdev_flags |= SDF_CMD_READ;
1143 s->len_chanlist = s->n_chan;
1144 s->do_cmdtest = dt282x_ai_cmdtest;
1145 s->do_cmd = dt282x_ai_cmd;
1146 s->cancel = dt282x_ai_cancel;
1149 /* Analog Output subdevice */
1150 s = &dev->subdevices[1];
1151 if (board->dachan) {
1152 s->type = COMEDI_SUBD_AO;
1153 s->subdev_flags = SDF_WRITABLE;
1154 s->n_chan = board->dachan;
1155 s->maxdata = board->ao_maxdata;
1156 /* ranges are per-channel, set by jumpers on the board */
1157 s->range_table = &dt282x_ao_range;
1158 s->insn_write = dt282x_ao_insn_write;
1160 dev->write_subdev = s;
1161 s->subdev_flags |= SDF_CMD_WRITE;
1162 s->len_chanlist = s->n_chan;
1163 s->do_cmdtest = dt282x_ao_cmdtest;
1164 s->do_cmd = dt282x_ao_cmd;
1165 s->cancel = dt282x_ao_cancel;
1168 ret = comedi_alloc_subdev_readback(s);
1172 s->type = COMEDI_SUBD_UNUSED;
1175 /* Digital I/O subdevice */
1176 s = &dev->subdevices[2];
1177 s->type = COMEDI_SUBD_DIO;
1178 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
1181 s->range_table = &range_digital;
1182 s->insn_bits = dt282x_dio_insn_bits;
1183 s->insn_config = dt282x_dio_insn_config;
1188 static void dt282x_detach(struct comedi_device *dev)
1190 dt282x_free_dma(dev);
1191 comedi_legacy_detach(dev);
1194 static struct comedi_driver dt282x_driver = {
1195 .driver_name = "dt282x",
1196 .module = THIS_MODULE,
1197 .attach = dt282x_attach,
1198 .detach = dt282x_detach,
1199 .board_name = &boardtypes[0].name,
1200 .num_names = ARRAY_SIZE(boardtypes),
1201 .offset = sizeof(struct dt282x_board),
1203 module_comedi_driver(dt282x_driver);
1205 MODULE_AUTHOR("Comedi http://www.comedi.org");
1206 MODULE_DESCRIPTION("Comedi driver for Data Translation DT2821 series");
1207 MODULE_LICENSE("GPL");