1 // SPDX-License-Identifier: GPL-2.0+
4 * Comedi driver for Data Translation DT2821 series
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
12 * Description: Data Translation DT2821 series (including DT-EZ)
14 * Devices: [Data Translation] DT2821 (dt2821), DT2821-F-16SE (dt2821-f),
15 * DT2821-F-8DI (dt2821-f), DT2821-G-16SE (dt2821-g),
16 * DT2821-G-8DI (dt2821-g), DT2823 (dt2823), DT2824-PGH (dt2824-pgh),
17 * DT2824-PGL (dt2824-pgl), DT2825 (dt2825), DT2827 (dt2827),
18 * DT2828 (dt2828), DT2928 (dt2829), DT21-EZ (dt21-ez), DT23-EZ (dt23-ez),
19 * DT24-EZ (dt24-ez), DT24-EZ-PGL (dt24-ez-pgl)
21 * Updated: Wed, 22 Aug 2001 17:11:34 -0700
23 * Configuration options:
24 * [0] - I/O port base address
25 * [1] - IRQ (optional, required for async command support)
26 * [2] - DMA 1 (optional, required for async command support)
27 * [3] - DMA 2 (optional, required for async command support)
28 * [4] - AI jumpered for 0=single ended, 1=differential
29 * [5] - AI jumpered for 0=straight binary, 1=2's complement
30 * [6] - AO 0 data format (deprecated, see below)
31 * [7] - AO 1 data format (deprecated, see below)
32 * [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5]
33 * [9] - AO channel 0 range (deprecated, see below)
34 * [10]- AO channel 1 range (deprecated, see below)
37 * - AO commands might be broken.
38 * - If you try to run a command on both the AI and AO subdevices
39 * simultaneously, bad things will happen. The driver needs to
40 * be fixed to check for this situation and return an error.
41 * - AO range is not programmable. The AO subdevice has a range_table
42 * containing all the possible analog output ranges. Use the range
43 * that matches your board configuration to convert between data
44 * values and physical units. The format of the data written to the
45 * board is handled automatically based on the unipolar/bipolar
46 * range that is selected.
49 #include <linux/module.h>
50 #include <linux/delay.h>
51 #include <linux/gfp.h>
52 #include <linux/interrupt.h>
54 #include <linux/comedi/comedidev.h>
55 #include <linux/comedi/comedi_isadma.h>
60 #define DT2821_ADCSR_REG 0x00
61 #define DT2821_ADCSR_ADERR BIT(15)
62 #define DT2821_ADCSR_ADCLK BIT(9)
63 #define DT2821_ADCSR_MUXBUSY BIT(8)
64 #define DT2821_ADCSR_ADDONE BIT(7)
65 #define DT2821_ADCSR_IADDONE BIT(6)
66 #define DT2821_ADCSR_GS(x) (((x) & 0x3) << 4)
67 #define DT2821_ADCSR_CHAN(x) (((x) & 0xf) << 0)
68 #define DT2821_CHANCSR_REG 0x02
69 #define DT2821_CHANCSR_LLE BIT(15)
70 #define DT2821_CHANCSR_TO_PRESLA(x) (((x) >> 8) & 0xf)
71 #define DT2821_CHANCSR_NUMB(x) ((((x) - 1) & 0xf) << 0)
72 #define DT2821_ADDAT_REG 0x04
73 #define DT2821_DACSR_REG 0x06
74 #define DT2821_DACSR_DAERR BIT(15)
75 #define DT2821_DACSR_YSEL(x) ((x) << 9)
76 #define DT2821_DACSR_SSEL BIT(8)
77 #define DT2821_DACSR_DACRDY BIT(7)
78 #define DT2821_DACSR_IDARDY BIT(6)
79 #define DT2821_DACSR_DACLK BIT(5)
80 #define DT2821_DACSR_HBOE BIT(1)
81 #define DT2821_DACSR_LBOE BIT(0)
82 #define DT2821_DADAT_REG 0x08
83 #define DT2821_DIODAT_REG 0x0a
84 #define DT2821_SUPCSR_REG 0x0c
85 #define DT2821_SUPCSR_DMAD BIT(15)
86 #define DT2821_SUPCSR_ERRINTEN BIT(14)
87 #define DT2821_SUPCSR_CLRDMADNE BIT(13)
88 #define DT2821_SUPCSR_DDMA BIT(12)
89 #define DT2821_SUPCSR_DS(x) (((x) & 0x3) << 10)
90 #define DT2821_SUPCSR_DS_PIO DT2821_SUPCSR_DS(0)
91 #define DT2821_SUPCSR_DS_AD_CLK DT2821_SUPCSR_DS(1)
92 #define DT2821_SUPCSR_DS_DA_CLK DT2821_SUPCSR_DS(2)
93 #define DT2821_SUPCSR_DS_AD_TRIG DT2821_SUPCSR_DS(3)
94 #define DT2821_SUPCSR_BUFFB BIT(9)
95 #define DT2821_SUPCSR_SCDN BIT(8)
96 #define DT2821_SUPCSR_DACON BIT(7)
97 #define DT2821_SUPCSR_ADCINIT BIT(6)
98 #define DT2821_SUPCSR_DACINIT BIT(5)
99 #define DT2821_SUPCSR_PRLD BIT(4)
100 #define DT2821_SUPCSR_STRIG BIT(3)
101 #define DT2821_SUPCSR_XTRIG BIT(2)
102 #define DT2821_SUPCSR_XCLK BIT(1)
103 #define DT2821_SUPCSR_BDINIT BIT(0)
104 #define DT2821_TMRCTR_REG 0x0e
105 #define DT2821_TMRCTR_PRESCALE(x) (((x) & 0xf) << 8)
106 #define DT2821_TMRCTR_DIVIDER(x) ((255 - ((x) & 0xff)) << 0)
109 #define DT2821_OSC_BASE 250 /* 4 MHz (in nanoseconds) */
110 #define DT2821_PRESCALE(x) BIT(x)
111 #define DT2821_PRESCALE_MAX 15
112 #define DT2821_DIVIDER_MAX 255
113 #define DT2821_OSC_MAX (DT2821_OSC_BASE * \
114 DT2821_PRESCALE(DT2821_PRESCALE_MAX) * \
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 <= DT2821_PRESCALE_MAX; prescale++) {
369 if (prescale == 1) /* 0 and 1 are both divide by 1 */
371 base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale);
372 switch (flags & CMDF_ROUND_MASK) {
373 case CMDF_ROUND_NEAREST:
375 divider = DIV_ROUND_CLOSEST(*ns, base);
377 case CMDF_ROUND_DOWN:
378 divider = (*ns) / base;
381 divider = DIV_ROUND_UP(*ns, base);
384 if (divider <= DT2821_DIVIDER_MAX)
387 if (divider > DT2821_DIVIDER_MAX) {
388 prescale = DT2821_PRESCALE_MAX;
389 divider = DT2821_DIVIDER_MAX;
390 base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale);
392 *ns = divider * base;
393 return DT2821_TMRCTR_PRESCALE(prescale) |
394 DT2821_TMRCTR_DIVIDER(divider);
397 static void dt282x_munge(struct comedi_device *dev,
398 struct comedi_subdevice *s,
402 struct dt282x_private *devpriv = dev->private;
407 dev_err(dev->class_dev,
408 "bug! odd number of bytes from dma xfer\n");
410 for (i = 0; i < nbytes / 2; i++) {
413 if (devpriv->ad_2scomp)
414 val = comedi_offset_munge(s, val);
420 static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev,
421 struct comedi_subdevice *s,
424 struct dt282x_private *devpriv = dev->private;
425 struct comedi_isadma *dma = devpriv->dma;
426 struct comedi_isadma_desc *desc = &dma->desc[cur_dma];
427 unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize);
430 nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples);
432 dt282x_prep_ao_dma(dev, cur_dma, nbytes);
434 dev_err(dev->class_dev, "AO underrun\n");
439 static void dt282x_ao_dma_interrupt(struct comedi_device *dev,
440 struct comedi_subdevice *s)
442 struct dt282x_private *devpriv = dev->private;
443 struct comedi_isadma *dma = devpriv->dma;
444 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
446 outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
447 dev->iobase + DT2821_SUPCSR_REG);
449 comedi_isadma_disable(desc->chan);
451 if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma))
452 s->async->events |= COMEDI_CB_OVERFLOW;
454 dma->cur_dma = 1 - dma->cur_dma;
457 static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
458 struct comedi_subdevice *s)
460 struct dt282x_private *devpriv = dev->private;
461 struct comedi_isadma *dma = devpriv->dma;
462 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
463 unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
466 outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
467 dev->iobase + DT2821_SUPCSR_REG);
469 comedi_isadma_disable(desc->chan);
471 dt282x_munge(dev, s, desc->virt_addr, desc->size);
472 ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples);
473 if (ret != desc->size)
476 devpriv->nread -= nsamples;
477 if (devpriv->nread < 0) {
478 dev_info(dev->class_dev, "nread off by one\n");
481 if (!devpriv->nread) {
482 s->async->events |= COMEDI_CB_EOA;
486 /* restart the channel */
487 dt282x_prep_ai_dma(dev, dma->cur_dma, 0);
489 dma->cur_dma = 1 - dma->cur_dma;
492 static irqreturn_t dt282x_interrupt(int irq, void *d)
494 struct comedi_device *dev = d;
495 struct dt282x_private *devpriv = dev->private;
496 struct comedi_subdevice *s = dev->read_subdev;
497 struct comedi_subdevice *s_ao = dev->write_subdev;
498 unsigned int supcsr, adcsr, dacsr;
501 if (!dev->attached) {
502 dev_err(dev->class_dev, "spurious interrupt\n");
506 adcsr = inw(dev->iobase + DT2821_ADCSR_REG);
507 dacsr = inw(dev->iobase + DT2821_DACSR_REG);
508 supcsr = inw(dev->iobase + DT2821_SUPCSR_REG);
509 if (supcsr & DT2821_SUPCSR_DMAD) {
510 if (devpriv->dma_dir == COMEDI_ISADMA_READ)
511 dt282x_ai_dma_interrupt(dev, s);
513 dt282x_ao_dma_interrupt(dev, s_ao);
516 if (adcsr & DT2821_ADCSR_ADERR) {
517 if (devpriv->nread != 0) {
518 dev_err(dev->class_dev, "A/D error\n");
519 s->async->events |= COMEDI_CB_ERROR;
523 if (dacsr & DT2821_DACSR_DAERR) {
524 dev_err(dev->class_dev, "D/A error\n");
525 s_ao->async->events |= COMEDI_CB_ERROR;
529 comedi_handle_events(dev, s);
531 comedi_handle_events(dev, s_ao);
533 return IRQ_RETVAL(handled);
536 static void dt282x_load_changain(struct comedi_device *dev, int n,
537 unsigned int *chanlist)
539 struct dt282x_private *devpriv = dev->private;
542 outw(DT2821_CHANCSR_LLE | DT2821_CHANCSR_NUMB(n),
543 dev->iobase + DT2821_CHANCSR_REG);
544 for (i = 0; i < n; i++) {
545 unsigned int chan = CR_CHAN(chanlist[i]);
546 unsigned int range = CR_RANGE(chanlist[i]);
548 outw(devpriv->adcsr |
549 DT2821_ADCSR_GS(range) |
550 DT2821_ADCSR_CHAN(chan),
551 dev->iobase + DT2821_ADCSR_REG);
553 outw(DT2821_CHANCSR_NUMB(n), dev->iobase + DT2821_CHANCSR_REG);
556 static int dt282x_ai_timeout(struct comedi_device *dev,
557 struct comedi_subdevice *s,
558 struct comedi_insn *insn,
559 unsigned long context)
563 status = inw(dev->iobase + DT2821_ADCSR_REG);
565 case DT2821_ADCSR_MUXBUSY:
566 if ((status & DT2821_ADCSR_MUXBUSY) == 0)
569 case DT2821_ADCSR_ADDONE:
570 if (status & DT2821_ADCSR_ADDONE)
580 * Performs a single A/D conversion.
581 * - Put channel/gain into channel-gain list
582 * - preload multiplexer
583 * - trigger conversion and wait for it to finish
585 static int dt282x_ai_insn_read(struct comedi_device *dev,
586 struct comedi_subdevice *s,
587 struct comedi_insn *insn,
590 struct dt282x_private *devpriv = dev->private;
595 /* XXX should we really be enabling the ad clock here? */
596 devpriv->adcsr = DT2821_ADCSR_ADCLK;
597 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
599 dt282x_load_changain(dev, 1, &insn->chanspec);
601 outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
602 dev->iobase + DT2821_SUPCSR_REG);
603 ret = comedi_timeout(dev, s, insn,
604 dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
608 for (i = 0; i < insn->n; i++) {
609 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
610 dev->iobase + DT2821_SUPCSR_REG);
612 ret = comedi_timeout(dev, s, insn,
613 dt282x_ai_timeout, DT2821_ADCSR_ADDONE);
617 val = inw(dev->iobase + DT2821_ADDAT_REG);
619 if (devpriv->ad_2scomp)
620 val = comedi_offset_munge(s, val);
628 static int dt282x_ai_cmdtest(struct comedi_device *dev,
629 struct comedi_subdevice *s,
630 struct comedi_cmd *cmd)
632 const struct dt282x_board *board = dev->board_ptr;
633 struct dt282x_private *devpriv = dev->private;
637 /* Step 1 : check if triggers are trivially valid */
639 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
640 err |= comedi_check_trigger_src(&cmd->scan_begin_src,
641 TRIG_FOLLOW | TRIG_EXT);
642 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
643 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
644 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
649 /* Step 2a : make sure trigger sources are unique */
651 err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
652 err |= comedi_check_trigger_is_unique(cmd->stop_src);
654 /* Step 2b : and mutually compatible */
659 /* Step 3: check if arguments are trivially valid */
661 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
662 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
663 err |= comedi_check_trigger_arg_max(&cmd->convert_arg, DT2821_OSC_MAX);
664 err |= comedi_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed);
665 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
668 if (cmd->stop_src == TRIG_COUNT)
669 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
670 else /* TRIG_EXT | TRIG_NONE */
671 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
676 /* step 4: fix up any arguments */
678 arg = cmd->convert_arg;
679 devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
680 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
688 static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
690 struct dt282x_private *devpriv = dev->private;
691 struct comedi_isadma *dma = devpriv->dma;
692 struct comedi_cmd *cmd = &s->async->cmd;
695 dt282x_disable_dma(dev);
697 outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
699 devpriv->supcsr = DT2821_SUPCSR_ERRINTEN;
700 if (cmd->scan_begin_src == TRIG_FOLLOW)
701 devpriv->supcsr = DT2821_SUPCSR_DS_AD_CLK;
703 devpriv->supcsr = DT2821_SUPCSR_DS_AD_TRIG;
704 outw(devpriv->supcsr |
705 DT2821_SUPCSR_CLRDMADNE |
706 DT2821_SUPCSR_BUFFB |
707 DT2821_SUPCSR_ADCINIT,
708 dev->iobase + DT2821_SUPCSR_REG);
710 devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
711 devpriv->nread = devpriv->ntrig;
713 devpriv->dma_dir = COMEDI_ISADMA_READ;
715 dt282x_prep_ai_dma(dev, 0, 0);
716 if (devpriv->ntrig) {
717 dt282x_prep_ai_dma(dev, 1, 0);
718 devpriv->supcsr |= DT2821_SUPCSR_DDMA;
719 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
724 dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
726 devpriv->adcsr = DT2821_ADCSR_ADCLK | DT2821_ADCSR_IADDONE;
727 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
729 outw(devpriv->supcsr | DT2821_SUPCSR_PRLD,
730 dev->iobase + DT2821_SUPCSR_REG);
731 ret = comedi_timeout(dev, s, NULL,
732 dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY);
736 if (cmd->scan_begin_src == TRIG_FOLLOW) {
737 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
738 dev->iobase + DT2821_SUPCSR_REG);
740 devpriv->supcsr |= DT2821_SUPCSR_XTRIG;
741 outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG);
747 static int dt282x_ai_cancel(struct comedi_device *dev,
748 struct comedi_subdevice *s)
750 struct dt282x_private *devpriv = dev->private;
752 dt282x_disable_dma(dev);
755 outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG);
758 outw(devpriv->supcsr | DT2821_SUPCSR_ADCINIT,
759 dev->iobase + DT2821_SUPCSR_REG);
764 static int dt282x_ao_insn_write(struct comedi_device *dev,
765 struct comedi_subdevice *s,
766 struct comedi_insn *insn,
769 struct dt282x_private *devpriv = dev->private;
770 unsigned int chan = CR_CHAN(insn->chanspec);
771 unsigned int range = CR_RANGE(insn->chanspec);
774 devpriv->dacsr |= DT2821_DACSR_SSEL | DT2821_DACSR_YSEL(chan);
776 for (i = 0; i < insn->n; i++) {
777 unsigned int val = data[i];
779 s->readback[chan] = val;
781 if (comedi_range_is_bipolar(s, range))
782 val = comedi_offset_munge(s, val);
784 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
786 outw(val, dev->iobase + DT2821_DADAT_REG);
788 outw(devpriv->supcsr | DT2821_SUPCSR_DACON,
789 dev->iobase + DT2821_SUPCSR_REG);
795 static int dt282x_ao_cmdtest(struct comedi_device *dev,
796 struct comedi_subdevice *s,
797 struct comedi_cmd *cmd)
799 struct dt282x_private *devpriv = dev->private;
803 /* Step 1 : check if triggers are trivially valid */
805 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
806 err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
807 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
808 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
809 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
814 /* Step 2a : make sure trigger sources are unique */
816 err |= comedi_check_trigger_is_unique(cmd->stop_src);
818 /* Step 2b : and mutually compatible */
823 /* Step 3: check if arguments are trivially valid */
825 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
826 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 5000);
827 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
828 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
831 if (cmd->stop_src == TRIG_COUNT)
832 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
833 else /* TRIG_EXT | TRIG_NONE */
834 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
839 /* step 4: fix up any arguments */
841 arg = cmd->scan_begin_arg;
842 devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags);
843 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
851 static int dt282x_ao_inttrig(struct comedi_device *dev,
852 struct comedi_subdevice *s,
853 unsigned int trig_num)
855 struct dt282x_private *devpriv = dev->private;
856 struct comedi_cmd *cmd = &s->async->cmd;
858 if (trig_num != cmd->start_src)
861 if (!dt282x_ao_setup_dma(dev, s, 0))
864 if (!dt282x_ao_setup_dma(dev, s, 1))
867 outw(devpriv->supcsr | DT2821_SUPCSR_STRIG,
868 dev->iobase + DT2821_SUPCSR_REG);
869 s->async->inttrig = NULL;
874 static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
876 struct dt282x_private *devpriv = dev->private;
877 struct comedi_isadma *dma = devpriv->dma;
878 struct comedi_cmd *cmd = &s->async->cmd;
880 dt282x_disable_dma(dev);
882 devpriv->supcsr = DT2821_SUPCSR_ERRINTEN |
883 DT2821_SUPCSR_DS_DA_CLK |
885 outw(devpriv->supcsr |
886 DT2821_SUPCSR_CLRDMADNE |
887 DT2821_SUPCSR_BUFFB |
888 DT2821_SUPCSR_DACINIT,
889 dev->iobase + DT2821_SUPCSR_REG);
891 devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
892 devpriv->nread = devpriv->ntrig;
894 devpriv->dma_dir = COMEDI_ISADMA_WRITE;
897 outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
899 /* clear all bits but the DIO direction bits */
900 devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
902 devpriv->dacsr |= (DT2821_DACSR_SSEL |
904 DT2821_DACSR_IDARDY);
905 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
907 s->async->inttrig = dt282x_ao_inttrig;
912 static int dt282x_ao_cancel(struct comedi_device *dev,
913 struct comedi_subdevice *s)
915 struct dt282x_private *devpriv = dev->private;
917 dt282x_disable_dma(dev);
919 /* clear all bits but the DIO direction bits */
920 devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
922 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
925 outw(devpriv->supcsr | DT2821_SUPCSR_DACINIT,
926 dev->iobase + DT2821_SUPCSR_REG);
931 static int dt282x_dio_insn_bits(struct comedi_device *dev,
932 struct comedi_subdevice *s,
933 struct comedi_insn *insn,
936 if (comedi_dio_update_state(s, data))
937 outw(s->state, dev->iobase + DT2821_DIODAT_REG);
939 data[1] = inw(dev->iobase + DT2821_DIODAT_REG);
944 static int dt282x_dio_insn_config(struct comedi_device *dev,
945 struct comedi_subdevice *s,
946 struct comedi_insn *insn,
949 struct dt282x_private *devpriv = dev->private;
950 unsigned int chan = CR_CHAN(insn->chanspec);
959 ret = comedi_dio_insn_config(dev, s, insn, data, mask);
963 devpriv->dacsr &= ~(DT2821_DACSR_LBOE | DT2821_DACSR_HBOE);
964 if (s->io_bits & 0x00ff)
965 devpriv->dacsr |= DT2821_DACSR_LBOE;
966 if (s->io_bits & 0xff00)
967 devpriv->dacsr |= DT2821_DACSR_HBOE;
969 outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG);
974 static const struct comedi_lrange *const ai_range_table[] = {
975 &range_dt282x_ai_lo_bipolar,
976 &range_dt282x_ai_lo_unipolar,
977 &range_dt282x_ai_5_bipolar,
978 &range_dt282x_ai_5_unipolar
981 static const struct comedi_lrange *const ai_range_pgl_table[] = {
982 &range_dt282x_ai_hi_bipolar,
983 &range_dt282x_ai_hi_unipolar
986 static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
991 return ai_range_pgl_table[x];
996 return ai_range_table[x];
999 static void dt282x_alloc_dma(struct comedi_device *dev,
1000 struct comedi_devconfig *it)
1002 struct dt282x_private *devpriv = dev->private;
1003 unsigned int irq_num = it->options[1];
1004 unsigned int dma_chan[2];
1006 if (it->options[2] < it->options[3]) {
1007 dma_chan[0] = it->options[2];
1008 dma_chan[1] = it->options[3];
1010 dma_chan[0] = it->options[3];
1011 dma_chan[1] = it->options[2];
1014 if (!irq_num || dma_chan[0] == dma_chan[1] ||
1015 dma_chan[0] < 5 || dma_chan[0] > 7 ||
1016 dma_chan[1] < 5 || dma_chan[1] > 7)
1019 if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev))
1022 /* DMA uses two 4K buffers with separate DMA channels */
1023 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1],
1026 free_irq(irq_num, dev);
1031 static void dt282x_free_dma(struct comedi_device *dev)
1033 struct dt282x_private *devpriv = dev->private;
1036 comedi_isadma_free(devpriv->dma);
1039 static int dt282x_initialize(struct comedi_device *dev)
1041 /* Initialize board */
1042 outw(DT2821_SUPCSR_BDINIT, dev->iobase + DT2821_SUPCSR_REG);
1043 inw(dev->iobase + DT2821_ADCSR_REG);
1046 * At power up, some registers are in a well-known state.
1047 * Check them to see if a DT2821 series board is present.
1049 if (((inw(dev->iobase + DT2821_ADCSR_REG) & 0xfff0) != 0x7c00) ||
1050 ((inw(dev->iobase + DT2821_CHANCSR_REG) & 0xf0f0) != 0x70f0) ||
1051 ((inw(dev->iobase + DT2821_DACSR_REG) & 0x7c93) != 0x7c90) ||
1052 ((inw(dev->iobase + DT2821_SUPCSR_REG) & 0xf8ff) != 0x0000) ||
1053 ((inw(dev->iobase + DT2821_TMRCTR_REG) & 0xff00) != 0xf000)) {
1054 dev_err(dev->class_dev, "board not found\n");
1060 static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1062 const struct dt282x_board *board = dev->board_ptr;
1063 struct dt282x_private *devpriv;
1064 struct comedi_subdevice *s;
1067 ret = comedi_request_region(dev, it->options[0], 0x10);
1071 ret = dt282x_initialize(dev);
1075 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1079 /* an IRQ and 2 DMA channels are required for async command support */
1080 dt282x_alloc_dma(dev, it);
1082 ret = comedi_alloc_subdevices(dev, 3);
1086 /* Analog Input subdevice */
1087 s = &dev->subdevices[0];
1088 s->type = COMEDI_SUBD_AI;
1089 s->subdev_flags = SDF_READABLE;
1090 if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) {
1091 s->subdev_flags |= SDF_DIFF;
1092 s->n_chan = board->adchan_di;
1094 s->subdev_flags |= SDF_COMMON;
1095 s->n_chan = board->adchan_se;
1097 s->maxdata = board->ai_maxdata;
1099 s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]);
1100 devpriv->ad_2scomp = it->options[5] ? 1 : 0;
1102 s->insn_read = dt282x_ai_insn_read;
1104 dev->read_subdev = s;
1105 s->subdev_flags |= SDF_CMD_READ;
1106 s->len_chanlist = s->n_chan;
1107 s->do_cmdtest = dt282x_ai_cmdtest;
1108 s->do_cmd = dt282x_ai_cmd;
1109 s->cancel = dt282x_ai_cancel;
1112 /* Analog Output subdevice */
1113 s = &dev->subdevices[1];
1114 if (board->dachan) {
1115 s->type = COMEDI_SUBD_AO;
1116 s->subdev_flags = SDF_WRITABLE;
1117 s->n_chan = board->dachan;
1118 s->maxdata = board->ao_maxdata;
1119 /* ranges are per-channel, set by jumpers on the board */
1120 s->range_table = &dt282x_ao_range;
1121 s->insn_write = dt282x_ao_insn_write;
1123 dev->write_subdev = s;
1124 s->subdev_flags |= SDF_CMD_WRITE;
1125 s->len_chanlist = s->n_chan;
1126 s->do_cmdtest = dt282x_ao_cmdtest;
1127 s->do_cmd = dt282x_ao_cmd;
1128 s->cancel = dt282x_ao_cancel;
1131 ret = comedi_alloc_subdev_readback(s);
1135 s->type = COMEDI_SUBD_UNUSED;
1138 /* Digital I/O subdevice */
1139 s = &dev->subdevices[2];
1140 s->type = COMEDI_SUBD_DIO;
1141 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
1144 s->range_table = &range_digital;
1145 s->insn_bits = dt282x_dio_insn_bits;
1146 s->insn_config = dt282x_dio_insn_config;
1151 static void dt282x_detach(struct comedi_device *dev)
1153 dt282x_free_dma(dev);
1154 comedi_legacy_detach(dev);
1157 static struct comedi_driver dt282x_driver = {
1158 .driver_name = "dt282x",
1159 .module = THIS_MODULE,
1160 .attach = dt282x_attach,
1161 .detach = dt282x_detach,
1162 .board_name = &boardtypes[0].name,
1163 .num_names = ARRAY_SIZE(boardtypes),
1164 .offset = sizeof(struct dt282x_board),
1166 module_comedi_driver(dt282x_driver);
1168 MODULE_AUTHOR("Comedi https://www.comedi.org");
1169 MODULE_DESCRIPTION("Comedi driver for Data Translation DT2821 series");
1170 MODULE_LICENSE("GPL");