5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
7 Copyright (C) 2000 Chris R. Baugher <baugher@enteract.com>
8 Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 ************************************************************************
28 Description: DAS16 compatible boards
29 Author: Sam Moore, Warren Jasper, ds, Chris Baugher, Frank Hess, Roman Fietze
30 Devices: [Keithley Metrabyte] DAS-16 (das-16), DAS-16G (das-16g),
31 DAS-16F (das-16f), DAS-1201 (das-1201), DAS-1202 (das-1202),
32 DAS-1401 (das-1401), DAS-1402 (das-1402), DAS-1601 (das-1601),
34 [ComputerBoards] PC104-DAS16/JR (pc104-das16jr),
35 PC104-DAS16JR/16 (pc104-das16jr/16),
36 CIO-DAS16JR/16 (cio-das16jr/16),
37 CIO-DAS16/JR (cio-das16/jr), CIO-DAS1401/12 (cio-das1401/12),
38 CIO-DAS1402/12 (cio-das1402/12), CIO-DAS1402/16 (cio-das1402/16),
39 CIO-DAS1601/12 (cio-das1601/12), CIO-DAS1602/12 (cio-das1602/12),
40 CIO-DAS1602/16 (cio-das1602/16), CIO-DAS16/330 (cio-das16/330)
44 A rewrite of the das16 and das1600 drivers.
47 [1] - irq (does nothing, irq is not used anymore)
48 [2] - dma (optional, required for comedi_command support)
49 [3] - master clock speed in MHz (optional, 1 or 10, ignored if
50 board can probe clock, defaults to 1)
51 [4] - analog input range lowest voltage in microvolts (optional,
52 only useful if your board does not have software
54 [5] - analog input range highest voltage in microvolts (optional,
55 only useful if board does not have software programmable
57 [6] - analog output range lowest voltage in microvolts (optional)
58 [7] - analog output range highest voltage in microvolts (optional)
59 [8] - use timer mode for DMA. Timer mode is needed e.g. for
60 buggy DMA controllers in NS CS5530A (Geode Companion), and for
61 'jr' cards that lack a hardware fifo. This option is no
62 longer needed, since timer mode is _always_ used.
64 Passing a zero for an option is the same as leaving it unspecified.
69 Testing and debugging help provided by Daniel Koch.
73 4919.PDF (das1400, 1600)
75 4923.PDF (das1200, 1400, 1600)
77 Computer boards manuals also available from their website www.measurementcomputing.com
81 #include <linux/pci.h>
82 #include <linux/interrupt.h>
84 #include "../comedidev.h"
88 #include "comedi_fc.h"
94 #define DEBUG_PRINT(format, args...) printk("das16: " format, ## args)
96 #define DEBUG_PRINT(format, args...)
99 #define DAS16_SIZE 20 /* number of ioports */
100 #define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */
108 0 a/d bits 0-3 start 12 bit
109 1 a/d bits 4-11 unused
116 8 status eoc uni/bip interrupt reset
117 9 dma, int, trig ctrl set dma, int
118 a pacer control unused
130 0 a/d bits 0-3 start 12 bit
131 1 a/d bits 4-11 unused
135 8 status eoc uni/bip interrupt reset
136 9 dma, int, trig ctrl set dma, int
137 a pacer control unused
138 b gain status gain control
148 0 a/d bits 0-7 start 16 bit
149 1 a/d bits 8-15 unused
153 8 status eoc uni/bip interrupt reset
154 9 dma, int, trig ctrl set dma, int
155 a pacer control unused
156 b gain status gain control
167 0 a/d bits 0-3 start 12 bit
168 1 a/d bits 4-11 unused
175 8 status eoc uni/bip interrupt reset
176 9 dma, int, trig ctrl set dma, int
177 a pacer control unused
178 b gain status gain control
181 404 unused conversion enable
182 405 unused burst enable
183 406 unused das1600 enable
188 static const int sample_size = 2; /* size in bytes of a sample from board */
191 #define DAS16_AI_LSB 0
192 #define DAS16_AI_MSB 1
195 #define DAS16_AO_LSB(x) ((x)?6:4)
196 #define DAS16_AO_MSB(x) ((x)?7:5)
197 #define DAS16_STATUS 8
199 #define UNIPOLAR (1<<6)
200 #define DAS16_MUXBIT (1<<5)
201 #define DAS16_INT (1<<4)
202 #define DAS16_CONTROL 9
203 #define DAS16_INTE (1<<7)
204 #define DAS16_IRQ(x) (((x) & 0x7) << 4)
205 #define DMA_ENABLE (1<<2)
206 #define PACING_MASK 0x3
207 #define INT_PACER 0x03
208 #define EXT_PACER 0x02
209 #define DAS16_SOFT 0x00
210 #define DAS16_PACER 0x0A
211 #define DAS16_CTR0 (1<<1)
212 #define DAS16_TRIG0 (1<<0)
213 #define BURST_LEN_BITS(x) (((x) & 0xf) << 4)
214 #define DAS16_GAIN 0x0B
215 #define DAS16_CNTR0_DATA 0x0C
216 #define DAS16_CNTR1_DATA 0x0D
217 #define DAS16_CNTR2_DATA 0x0E
218 #define DAS16_CNTR_CONTROL 0x0F
219 #define DAS16_TERM_CNT 0x00
220 #define DAS16_ONE_SHOT 0x02
221 #define DAS16_RATE_GEN 0x04
222 #define DAS16_CNTR_LSB_MSB 0x30
223 #define DAS16_CNTR0 0x00
224 #define DAS16_CNTR1 0x40
225 #define DAS16_CNTR2 0x80
227 #define DAS1600_CONV 0x404
228 #define DAS1600_CONV_DISABLE 0x40
229 #define DAS1600_BURST 0x405
230 #define DAS1600_BURST_VAL 0x40
231 #define DAS1600_ENABLE 0x406
232 #define DAS1600_ENABLE_VAL 0x40
233 #define DAS1600_STATUS_B 0x407
234 #define DAS1600_BME 0x40
235 #define DAS1600_ME 0x20
236 #define DAS1600_CD 0x10
237 #define DAS1600_WS 0x02
238 #define DAS1600_CLK_10MHZ 0x01
240 static const struct comedi_lrange range_das1x01_bip = { 4, {
247 static const struct comedi_lrange range_das1x01_unip = { 4, {
254 static const struct comedi_lrange range_das1x02_bip = { 4, {
261 static const struct comedi_lrange range_das1x02_unip = { 4, {
268 static const struct comedi_lrange range_das16jr = { 9, {
269 /* also used by 16/330 */
281 static const struct comedi_lrange range_das16jr_16 = { 8, {
293 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
294 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
295 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
303 static const int *const das16_gainlists[] = {
310 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
317 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
327 unsigned have_byte:1;
330 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
331 struct comedi_insn *insn, unsigned int *data);
332 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
333 struct comedi_insn *insn, unsigned int *data);
334 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
335 struct comedi_insn *insn, unsigned int *data);
336 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
337 struct comedi_insn *insn, unsigned int *data);
339 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
340 struct comedi_cmd *cmd);
341 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s);
342 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
343 static void das16_ai_munge(struct comedi_device *dev, struct comedi_subdevice *s,
344 void *array, unsigned int num_bytes, unsigned int start_chan_index);
346 static void das16_reset(struct comedi_device *dev);
347 static irqreturn_t das16_dma_interrupt(int irq, void *d);
348 static void das16_timer_interrupt(unsigned long arg);
349 static void das16_interrupt(struct comedi_device *dev);
351 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
353 static int das1600_mode_detect(struct comedi_device *dev);
354 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
355 struct comedi_cmd cmd);
357 static void reg_dump(struct comedi_device *dev);
362 unsigned int ai_nbits;
363 unsigned int ai_speed; /* max conversion speed in nanosec */
366 unsigned int ao_nbits;
370 unsigned int i8255_offset;
371 unsigned int i8254_offset;
377 static const struct das16_board das16_boards[] = {
380 .ai = das16_ai_rinsn,
383 .ai_pg = das16_pg_none,
384 .ao = das16_ao_winsn,
386 .di = das16_di_rbits,
387 .do_ = das16_do_wbits,
388 .i8255_offset = 0x10,
389 .i8254_offset = 0x0c,
395 .ai = das16_ai_rinsn,
398 .ai_pg = das16_pg_none,
399 .ao = das16_ao_winsn,
401 .di = das16_di_rbits,
402 .do_ = das16_do_wbits,
403 .i8255_offset = 0x10,
404 .i8254_offset = 0x0c,
410 .ai = das16_ai_rinsn,
413 .ai_pg = das16_pg_none,
414 .ao = das16_ao_winsn,
416 .di = das16_di_rbits,
417 .do_ = das16_do_wbits,
418 .i8255_offset = 0x10,
419 .i8254_offset = 0x0c,
424 .name = "cio-das16", /* cio-das16.pdf */
425 .ai = das16_ai_rinsn,
428 .ai_pg = das16_pg_none,
429 .ao = das16_ao_winsn,
431 .di = das16_di_rbits,
432 .do_ = das16_do_wbits,
433 .i8255_offset = 0x10,
434 .i8254_offset = 0x0c,
439 .name = "cio-das16/f", /* das16.pdf */
440 .ai = das16_ai_rinsn,
443 .ai_pg = das16_pg_none,
444 .ao = das16_ao_winsn,
446 .di = das16_di_rbits,
447 .do_ = das16_do_wbits,
448 .i8255_offset = 0x10,
449 .i8254_offset = 0x0c,
454 .name = "cio-das16/jr", /* cio-das16jr.pdf */
455 .ai = das16_ai_rinsn,
458 .ai_pg = das16_pg_16jr,
460 .di = das16_di_rbits,
461 .do_ = das16_do_wbits,
463 .i8254_offset = 0x0c,
468 .name = "pc104-das16jr", /* pc104-das16jr_xx.pdf */
469 .ai = das16_ai_rinsn,
472 .ai_pg = das16_pg_16jr,
474 .di = das16_di_rbits,
475 .do_ = das16_do_wbits,
477 .i8254_offset = 0x0c,
482 .name = "cio-das16jr/16", /* cio-das16jr_16.pdf */
483 .ai = das16_ai_rinsn,
486 .ai_pg = das16_pg_16jr_16,
488 .di = das16_di_rbits,
489 .do_ = das16_do_wbits,
491 .i8254_offset = 0x0c,
496 .name = "pc104-das16jr/16", /* pc104-das16jr_xx.pdf */
497 .ai = das16_ai_rinsn,
500 .ai_pg = das16_pg_16jr_16,
502 .di = das16_di_rbits,
503 .do_ = das16_do_wbits,
505 .i8254_offset = 0x0c,
510 .name = "das-1201", /* 4924.pdf (keithley user's manual) */
511 .ai = das16_ai_rinsn,
514 .ai_pg = das16_pg_none,
516 .di = das16_di_rbits,
517 .do_ = das16_do_wbits,
518 .i8255_offset = 0x400,
519 .i8254_offset = 0x0c,
524 .name = "das-1202", /* 4924.pdf (keithley user's manual) */
525 .ai = das16_ai_rinsn,
528 .ai_pg = das16_pg_none,
530 .di = das16_di_rbits,
531 .do_ = das16_do_wbits,
532 .i8255_offset = 0x400,
533 .i8254_offset = 0x0c,
538 .name = "das-1401", /* 4919.pdf and 4922.pdf (keithley user's manual) */
539 .ai = das16_ai_rinsn,
542 .ai_pg = das16_pg_1601,
544 .di = das16_di_rbits,
545 .do_ = das16_do_wbits,
547 .i8254_offset = 0x0c,
549 .id = 0xc0 /* 4919.pdf says id bits are 0xe0, 4922.pdf says 0xc0 */
552 .name = "das-1402", /* 4919.pdf and 4922.pdf (keithley user's manual) */
553 .ai = das16_ai_rinsn,
556 .ai_pg = das16_pg_1602,
558 .di = das16_di_rbits,
559 .do_ = das16_do_wbits,
561 .i8254_offset = 0x0c,
563 .id = 0xc0 /* 4919.pdf says id bits are 0xe0, 4922.pdf says 0xc0 */
566 .name = "das-1601", /* 4919.pdf */
567 .ai = das16_ai_rinsn,
570 .ai_pg = das16_pg_1601,
571 .ao = das16_ao_winsn,
573 .di = das16_di_rbits,
574 .do_ = das16_do_wbits,
575 .i8255_offset = 0x400,
576 .i8254_offset = 0x0c,
580 .name = "das-1602", /* 4919.pdf */
581 .ai = das16_ai_rinsn,
584 .ai_pg = das16_pg_1602,
585 .ao = das16_ao_winsn,
587 .di = das16_di_rbits,
588 .do_ = das16_do_wbits,
589 .i8255_offset = 0x400,
590 .i8254_offset = 0x0c,
594 .name = "cio-das1401/12", /* cio-das1400_series.pdf */
595 .ai = das16_ai_rinsn,
598 .ai_pg = das16_pg_1601,
600 .di = das16_di_rbits,
601 .do_ = das16_do_wbits,
603 .i8254_offset = 0x0c,
607 .name = "cio-das1402/12", /* cio-das1400_series.pdf */
608 .ai = das16_ai_rinsn,
611 .ai_pg = das16_pg_1602,
613 .di = das16_di_rbits,
614 .do_ = das16_do_wbits,
616 .i8254_offset = 0x0c,
620 .name = "cio-das1402/16", /* cio-das1400_series.pdf */
621 .ai = das16_ai_rinsn,
624 .ai_pg = das16_pg_1602,
626 .di = das16_di_rbits,
627 .do_ = das16_do_wbits,
629 .i8254_offset = 0x0c,
633 .name = "cio-das1601/12", /* cio-das160x-1x.pdf */
634 .ai = das16_ai_rinsn,
637 .ai_pg = das16_pg_1601,
638 .ao = das16_ao_winsn,
640 .di = das16_di_rbits,
641 .do_ = das16_do_wbits,
642 .i8255_offset = 0x400,
643 .i8254_offset = 0x0c,
647 .name = "cio-das1602/12", /* cio-das160x-1x.pdf */
648 .ai = das16_ai_rinsn,
651 .ai_pg = das16_pg_1602,
652 .ao = das16_ao_winsn,
654 .di = das16_di_rbits,
655 .do_ = das16_do_wbits,
656 .i8255_offset = 0x400,
657 .i8254_offset = 0x0c,
661 .name = "cio-das1602/16", /* cio-das160x-1x.pdf */
662 .ai = das16_ai_rinsn,
665 .ai_pg = das16_pg_1602,
666 .ao = das16_ao_winsn,
668 .di = das16_di_rbits,
669 .do_ = das16_do_wbits,
670 .i8255_offset = 0x400,
671 .i8254_offset = 0x0c,
675 .name = "cio-das16/330", /* ? */
676 .ai = das16_ai_rinsn,
679 .ai_pg = das16_pg_16jr,
681 .di = das16_di_rbits,
682 .do_ = das16_do_wbits,
684 .i8254_offset = 0x0c,
689 .name = "das16/330i", /* ? */
692 .name = "das16/jr/ctr5", /* ? */
695 .name = "cio-das16/m1/16", /* cio-das16_m1_16.pdf, this board is a bit quirky, no dma */
700 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it);
701 static int das16_detach(struct comedi_device *dev);
702 static struct comedi_driver driver_das16 = {
703 .driver_name = "das16",
704 .module = THIS_MODULE,
705 .attach = das16_attach,
706 .detach = das16_detach,
707 .board_name = &das16_boards[0].name,
708 .num_names = ARRAY_SIZE(das16_boards),
709 .offset = sizeof(das16_boards[0]),
712 #define DAS16_TIMEOUT 1000
714 /* Period for timer interrupt in jiffies. It's a function
715 * to deal with possibility of dynamic HZ patches */
716 static inline int timer_period(void)
720 struct das16_private_struct {
721 unsigned int ai_unipolar; /* unipolar flag */
722 unsigned int ai_singleended; /* single ended flag */
723 unsigned int clockbase; /* master clock speed in ns */
724 volatile unsigned int control_state; /* dma, interrupt and trigger control bits */
725 volatile unsigned long adc_byte_count; /* number of bytes remaining */
726 unsigned int divisor1; /* divisor dividing master clock to get conversion frequency */
727 unsigned int divisor2; /* divisor dividing master clock to get conversion frequency */
728 unsigned int dma_chan; /* dma channel */
729 uint16_t *dma_buffer[2];
730 dma_addr_t dma_buffer_addr[2];
731 unsigned int current_buffer;
732 volatile unsigned int dma_transfer_size; /* target number of bytes to transfer per dma shot */
733 /* user-defined analog input and output ranges defined from config options */
734 struct comedi_lrange *user_ai_range_table;
735 struct comedi_lrange *user_ao_range_table;
737 struct timer_list timer; /* for timed interrupt */
738 volatile short timer_running;
739 volatile short timer_mode; /* true if using timer mode */
741 #define devpriv ((struct das16_private_struct *)(dev->private))
742 #define thisboard ((struct das16_board *)(dev->board_ptr))
744 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
745 struct comedi_cmd *cmd)
748 int gain, start_chan, i;
751 /* make sure triggers are valid */
752 tmp = cmd->start_src;
753 cmd->start_src &= TRIG_NOW;
754 if (!cmd->start_src || tmp != cmd->start_src)
757 tmp = cmd->scan_begin_src;
759 /* if board supports burst mode */
760 if (thisboard->size > 0x400)
761 mask |= TRIG_TIMER | TRIG_EXT;
762 cmd->scan_begin_src &= mask;
763 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
766 tmp = cmd->convert_src;
767 mask = TRIG_TIMER | TRIG_EXT;
768 /* if board supports burst mode */
769 if (thisboard->size > 0x400)
771 cmd->convert_src &= mask;
772 if (!cmd->convert_src || tmp != cmd->convert_src)
775 tmp = cmd->scan_end_src;
776 cmd->scan_end_src &= TRIG_COUNT;
777 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
781 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
782 if (!cmd->stop_src || tmp != cmd->stop_src)
788 /* step 2: make sure trigger sources are unique and mutually compatible */
789 if (cmd->scan_begin_src != TRIG_TIMER &&
790 cmd->scan_begin_src != TRIG_EXT &&
791 cmd->scan_begin_src != TRIG_FOLLOW)
793 if (cmd->convert_src != TRIG_TIMER &&
794 cmd->convert_src != TRIG_EXT && cmd->convert_src != TRIG_NOW)
796 if (cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_COUNT)
799 /* make sure scan_begin_src and convert_src dont conflict */
800 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
802 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
808 /* step 3: make sure arguments are trivially compatible */
809 if (cmd->start_arg != 0) {
814 if (cmd->scan_begin_src == TRIG_FOLLOW) {
815 /* internal trigger */
816 if (cmd->scan_begin_arg != 0) {
817 cmd->scan_begin_arg = 0;
822 if (cmd->scan_end_arg != cmd->chanlist_len) {
823 cmd->scan_end_arg = cmd->chanlist_len;
826 /* check against maximum frequency */
827 if (cmd->scan_begin_src == TRIG_TIMER) {
828 if (cmd->scan_begin_arg <
829 thisboard->ai_speed * cmd->chanlist_len) {
830 cmd->scan_begin_arg =
831 thisboard->ai_speed * cmd->chanlist_len;
835 if (cmd->convert_src == TRIG_TIMER) {
836 if (cmd->convert_arg < thisboard->ai_speed) {
837 cmd->convert_arg = thisboard->ai_speed;
842 if (cmd->stop_src == TRIG_NONE) {
843 if (cmd->stop_arg != 0) {
851 /* step 4: fix up arguments */
852 if (cmd->scan_begin_src == TRIG_TIMER) {
853 unsigned int tmp = cmd->scan_begin_arg;
854 /* set divisors, correct timing arguments */
855 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
856 &(devpriv->divisor1), &(devpriv->divisor2),
857 &(cmd->scan_begin_arg), cmd->flags & TRIG_ROUND_MASK);
858 err += (tmp != cmd->scan_begin_arg);
860 if (cmd->convert_src == TRIG_TIMER) {
861 unsigned int tmp = cmd->convert_arg;
862 /* set divisors, correct timing arguments */
863 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
864 &(devpriv->divisor1), &(devpriv->divisor2),
865 &(cmd->convert_arg), cmd->flags & TRIG_ROUND_MASK);
866 err += (tmp != cmd->convert_arg);
871 /* check channel/gain list against card's limitations */
873 gain = CR_RANGE(cmd->chanlist[0]);
874 start_chan = CR_CHAN(cmd->chanlist[0]);
875 for (i = 1; i < cmd->chanlist_len; i++) {
876 if (CR_CHAN(cmd->chanlist[i]) !=
877 (start_chan + i) % s->n_chan) {
879 "entries in chanlist must be consecutive channels, counting upwards\n");
882 if (CR_RANGE(cmd->chanlist[i]) != gain) {
884 "entries in chanlist must all have the same gain\n");
895 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
897 struct comedi_async *async = s->async;
898 struct comedi_cmd *cmd = &async->cmd;
903 if (devpriv->dma_chan == 0 || (dev->irq == 0
904 && devpriv->timer_mode == 0)) {
906 "irq (or use of 'timer mode') dma required to execute comedi_cmd");
909 if (cmd->flags & TRIG_RT) {
911 "isa dma transfers cannot be performed with TRIG_RT, aborting");
915 devpriv->adc_byte_count =
916 cmd->stop_arg * cmd->chanlist_len * sizeof(uint16_t);
918 /* disable conversions for das1600 mode */
919 if (thisboard->size > 0x400) {
920 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV);
922 /* set scan limits */
923 byte = CR_CHAN(cmd->chanlist[0]);
924 byte |= CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]) << 4;
925 outb(byte, dev->iobase + DAS16_MUX);
927 /* set gain (this is also burst rate register but according to
928 * computer boards manual, burst rate does nothing, even on keithley cards) */
929 if (thisboard->ai_pg != das16_pg_none) {
930 range = CR_RANGE(cmd->chanlist[0]);
931 outb((das16_gainlists[thisboard->ai_pg])[range],
932 dev->iobase + DAS16_GAIN);
935 /* set counter mode and counts */
937 das16_set_pacer(dev, cmd->convert_arg,
938 cmd->flags & TRIG_ROUND_MASK);
939 DEBUG_PRINT("pacer period: %d ns\n", cmd->convert_arg);
941 /* enable counters */
943 /* Enable burst mode if appropriate. */
944 if (thisboard->size > 0x400) {
945 if (cmd->convert_src == TRIG_NOW) {
946 outb(DAS1600_BURST_VAL, dev->iobase + DAS1600_BURST);
947 /* set burst length */
948 byte |= BURST_LEN_BITS(cmd->chanlist_len - 1);
950 outb(0, dev->iobase + DAS1600_BURST);
953 outb(byte, dev->iobase + DAS16_PACER);
955 /* set up dma transfer */
956 flags = claim_dma_lock();
957 disable_dma(devpriv->dma_chan);
958 /* clear flip-flop to make sure 2-byte registers for
959 * count and address get set correctly */
960 clear_dma_ff(devpriv->dma_chan);
961 devpriv->current_buffer = 0;
962 set_dma_addr(devpriv->dma_chan,
963 devpriv->dma_buffer_addr[devpriv->current_buffer]);
964 /* set appropriate size of transfer */
965 devpriv->dma_transfer_size = das16_suggest_transfer_size(dev, *cmd);
966 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
967 enable_dma(devpriv->dma_chan);
968 release_dma_lock(flags);
970 /* set up interrupt */
971 if (devpriv->timer_mode) {
972 devpriv->timer_running = 1;
973 devpriv->timer.expires = jiffies + timer_period();
974 add_timer(&devpriv->timer);
975 devpriv->control_state &= ~DAS16_INTE;
977 /* clear interrupt bit */
978 outb(0x00, dev->iobase + DAS16_STATUS);
979 /* enable interrupts */
980 devpriv->control_state |= DAS16_INTE;
982 devpriv->control_state |= DMA_ENABLE;
983 devpriv->control_state &= ~PACING_MASK;
984 if (cmd->convert_src == TRIG_EXT)
985 devpriv->control_state |= EXT_PACER;
987 devpriv->control_state |= INT_PACER;
988 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
990 /* Enable conversions if using das1600 mode */
991 if (thisboard->size > 0x400) {
992 outb(0, dev->iobase + DAS1600_CONV);
998 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1000 unsigned long flags;
1002 spin_lock_irqsave(&dev->spinlock, flags);
1003 /* disable interrupts, dma and pacer clocked conversions */
1004 devpriv->control_state &= ~DAS16_INTE & ~PACING_MASK & ~DMA_ENABLE;
1005 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1006 if (devpriv->dma_chan)
1007 disable_dma(devpriv->dma_chan);
1009 /* disable SW timer */
1010 if (devpriv->timer_mode && devpriv->timer_running) {
1011 devpriv->timer_running = 0;
1012 del_timer(&devpriv->timer);
1015 /* disable burst mode */
1016 if (thisboard->size > 0x400) {
1017 outb(0, dev->iobase + DAS1600_BURST);
1020 spin_unlock_irqrestore(&dev->spinlock, flags);
1025 static void das16_reset(struct comedi_device *dev)
1027 outb(0, dev->iobase + DAS16_STATUS);
1028 outb(0, dev->iobase + DAS16_CONTROL);
1029 outb(0, dev->iobase + DAS16_PACER);
1030 outb(0, dev->iobase + DAS16_CNTR_CONTROL);
1033 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1034 struct comedi_insn *insn, unsigned int *data)
1041 /* disable interrupts and pacing */
1042 devpriv->control_state &= ~DAS16_INTE & ~DMA_ENABLE & ~PACING_MASK;
1043 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1045 /* set multiplexer */
1046 chan = CR_CHAN(insn->chanspec);
1047 chan |= CR_CHAN(insn->chanspec) << 4;
1048 outb(chan, dev->iobase + DAS16_MUX);
1051 if (thisboard->ai_pg != das16_pg_none) {
1052 range = CR_RANGE(insn->chanspec);
1053 outb((das16_gainlists[thisboard->ai_pg])[range],
1054 dev->iobase + DAS16_GAIN);
1057 for (n = 0; n < insn->n; n++) {
1058 /* trigger conversion */
1059 outb_p(0, dev->iobase + DAS16_TRIG);
1061 for (i = 0; i < DAS16_TIMEOUT; i++) {
1062 if (!(inb(dev->iobase + DAS16_STATUS) & BUSY))
1065 if (i == DAS16_TIMEOUT) {
1066 printk("das16: timeout\n");
1069 msb = inb(dev->iobase + DAS16_AI_MSB);
1070 lsb = inb(dev->iobase + DAS16_AI_LSB);
1071 if (thisboard->ai_nbits == 12) {
1072 data[n] = ((lsb >> 4) & 0xf) | (msb << 4);
1074 data[n] = lsb | (msb << 8);
1081 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
1082 struct comedi_insn *insn, unsigned int *data)
1086 bits = inb(dev->iobase + DAS16_DIO) & 0xf;
1093 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
1094 struct comedi_insn *insn, unsigned int *data)
1098 /* only set bits that have been masked */
1101 /* zero bits that have been masked */
1103 /* set masked bits */
1104 wbits |= data[0] & data[1];
1108 outb(s->state, dev->iobase + DAS16_DIO);
1113 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1114 struct comedi_insn *insn, unsigned int *data)
1120 chan = CR_CHAN(insn->chanspec);
1122 for (i = 0; i < insn->n; i++) {
1123 if (thisboard->ao_nbits == 12) {
1124 lsb = (data[i] << 4) & 0xff;
1125 msb = (data[i] >> 4) & 0xff;
1127 lsb = data[i] & 0xff;
1128 msb = (data[i] >> 8) & 0xff;
1130 outb(lsb, dev->iobase + DAS16_AO_LSB(chan));
1131 outb(msb, dev->iobase + DAS16_AO_MSB(chan));
1137 static irqreturn_t das16_dma_interrupt(int irq, void *d)
1140 struct comedi_device *dev = d;
1142 status = inb(dev->iobase + DAS16_STATUS);
1144 if ((status & DAS16_INT) == 0) {
1145 DEBUG_PRINT("spurious interrupt\n");
1149 /* clear interrupt */
1150 outb(0x00, dev->iobase + DAS16_STATUS);
1151 das16_interrupt(dev);
1155 static void das16_timer_interrupt(unsigned long arg)
1157 struct comedi_device *dev = (struct comedi_device *) arg;
1159 das16_interrupt(dev);
1161 if (devpriv->timer_running)
1162 mod_timer(&devpriv->timer, jiffies + timer_period());
1165 /* the pc104-das16jr (at least) has problems if the dma
1166 transfer is interrupted in the middle of transferring
1167 a 16 bit sample, so this function takes care to get
1168 an even transfer count after disabling dma
1171 static int disable_dma_on_even(struct comedi_device *dev)
1175 static const int disable_limit = 100;
1176 static const int enable_timeout = 100;
1177 disable_dma(devpriv->dma_chan);
1178 residue = get_dma_residue(devpriv->dma_chan);
1179 for (i = 0; i < disable_limit && (residue % 2); ++i) {
1181 enable_dma(devpriv->dma_chan);
1182 for (j = 0; j < enable_timeout; ++j) {
1185 new_residue = get_dma_residue(devpriv->dma_chan);
1186 if (new_residue != residue)
1189 disable_dma(devpriv->dma_chan);
1190 residue = get_dma_residue(devpriv->dma_chan);
1192 if (i == disable_limit) {
1194 "failed to get an even dma transfer, could be trouble.");
1199 static void das16_interrupt(struct comedi_device *dev)
1201 unsigned long dma_flags, spin_flags;
1202 struct comedi_subdevice *s = dev->read_subdev;
1203 struct comedi_async *async;
1204 struct comedi_cmd *cmd;
1205 int num_bytes, residue;
1208 if (dev->attached == 0) {
1209 comedi_error(dev, "premature interrupt");
1212 /* initialize async here to make sure it is not NULL */
1216 if (devpriv->dma_chan == 0) {
1217 comedi_error(dev, "interrupt with no dma channel?");
1221 spin_lock_irqsave(&dev->spinlock, spin_flags);
1222 if ((devpriv->control_state & DMA_ENABLE) == 0) {
1223 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
1224 DEBUG_PRINT("interrupt while dma disabled?\n");
1228 dma_flags = claim_dma_lock();
1229 clear_dma_ff(devpriv->dma_chan);
1230 residue = disable_dma_on_even(dev);
1232 /* figure out how many points to read */
1233 if (residue > devpriv->dma_transfer_size) {
1234 comedi_error(dev, "residue > transfer size!\n");
1235 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1238 num_bytes = devpriv->dma_transfer_size - residue;
1240 if (cmd->stop_src == TRIG_COUNT && num_bytes >= devpriv->adc_byte_count) {
1241 num_bytes = devpriv->adc_byte_count;
1242 async->events |= COMEDI_CB_EOA;
1245 buffer_index = devpriv->current_buffer;
1246 devpriv->current_buffer = (devpriv->current_buffer + 1) % 2;
1247 devpriv->adc_byte_count -= num_bytes;
1249 /* figure out how many bytes for next transfer */
1250 if (cmd->stop_src == TRIG_COUNT && devpriv->timer_mode == 0 &&
1251 devpriv->dma_transfer_size > devpriv->adc_byte_count)
1252 devpriv->dma_transfer_size = devpriv->adc_byte_count;
1255 if ((async->events & COMEDI_CB_EOA) == 0) {
1256 set_dma_addr(devpriv->dma_chan,
1257 devpriv->dma_buffer_addr[devpriv->current_buffer]);
1258 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
1259 enable_dma(devpriv->dma_chan);
1260 /* reenable conversions for das1600 mode, (stupid hardware) */
1261 if (thisboard->size > 0x400 && devpriv->timer_mode == 0) {
1262 outb(0x00, dev->iobase + DAS1600_CONV);
1265 release_dma_lock(dma_flags);
1267 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
1269 cfc_write_array_to_buffer(s,
1270 devpriv->dma_buffer[buffer_index], num_bytes);
1272 cfc_handle_events(dev, s);
1275 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
1278 i8253_cascade_ns_to_timer_2div(devpriv->clockbase, &(devpriv->divisor1),
1279 &(devpriv->divisor2), &ns, rounding_flags & TRIG_ROUND_MASK);
1281 /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
1282 i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 1, devpriv->divisor1, 2);
1283 i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 2, devpriv->divisor2, 2);
1288 static void reg_dump(struct comedi_device *dev)
1290 DEBUG_PRINT("********DAS1600 REGISTER DUMP********\n");
1291 DEBUG_PRINT("DAS16_MUX: %x\n", inb(dev->iobase + DAS16_MUX));
1292 DEBUG_PRINT("DAS16_DIO: %x\n", inb(dev->iobase + DAS16_DIO));
1293 DEBUG_PRINT("DAS16_STATUS: %x\n", inb(dev->iobase + DAS16_STATUS));
1294 DEBUG_PRINT("DAS16_CONTROL: %x\n", inb(dev->iobase + DAS16_CONTROL));
1295 DEBUG_PRINT("DAS16_PACER: %x\n", inb(dev->iobase + DAS16_PACER));
1296 DEBUG_PRINT("DAS16_GAIN: %x\n", inb(dev->iobase + DAS16_GAIN));
1297 DEBUG_PRINT("DAS16_CNTR_CONTROL: %x\n",
1298 inb(dev->iobase + DAS16_CNTR_CONTROL));
1299 DEBUG_PRINT("DAS1600_CONV: %x\n", inb(dev->iobase + DAS1600_CONV));
1300 DEBUG_PRINT("DAS1600_BURST: %x\n", inb(dev->iobase + DAS1600_BURST));
1301 DEBUG_PRINT("DAS1600_ENABLE: %x\n", inb(dev->iobase + DAS1600_ENABLE));
1302 DEBUG_PRINT("DAS1600_STATUS_B: %x\n",
1303 inb(dev->iobase + DAS1600_STATUS_B));
1306 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
1311 /* status is available on all boards */
1313 status = inb(dev->iobase + DAS16_STATUS);
1315 if ((status & UNIPOLAR)) {
1316 devpriv->ai_unipolar = 1;
1318 devpriv->ai_unipolar = 0;
1321 if ((status & DAS16_MUXBIT)) {
1322 devpriv->ai_singleended = 1;
1324 devpriv->ai_singleended = 0;
1327 /* diobits indicates boards */
1329 diobits = inb(dev->iobase + DAS16_DIO) & 0xf0;
1331 printk(" id bits are 0x%02x\n", diobits);
1332 if (thisboard->id != diobits) {
1333 printk(" requested board's id bits are 0x%x (ignore)\n",
1340 static int das1600_mode_detect(struct comedi_device *dev)
1344 status = inb(dev->iobase + DAS1600_STATUS_B);
1346 if (status & DAS1600_CLK_10MHZ) {
1347 devpriv->clockbase = 100;
1348 printk(" 10MHz pacer clock\n");
1350 devpriv->clockbase = 1000;
1351 printk(" 1MHz pacer clock\n");
1365 * 3 Clock speed (in MHz)
1368 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1370 struct comedi_subdevice *s;
1373 unsigned long iobase;
1374 unsigned int dma_chan;
1376 unsigned long flags;
1377 struct comedi_krange *user_ai_range, *user_ao_range;
1379 iobase = it->options[0];
1381 irq = it->options[1];
1382 timer_mode = it->options[8];
1384 /* always use time_mode since using irq can drop samples while
1385 * waiting for dma done interrupt (due to hardware limitations) */
1391 printk("comedi%d: das16:", dev->minor);
1393 /* check that clock setting is valid */
1394 if (it->options[3]) {
1395 if (it->options[3] != 0 &&
1396 it->options[3] != 1 && it->options[3] != 10) {
1397 printk("\n Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
1402 ret = alloc_private(dev, sizeof(struct das16_private_struct));
1406 if (thisboard->size < 0x400) {
1407 printk(" 0x%04lx-0x%04lx\n", iobase, iobase + thisboard->size);
1408 if (!request_region(iobase, thisboard->size, "das16")) {
1409 printk(" I/O port conflict\n");
1413 printk(" 0x%04lx-0x%04lx 0x%04lx-0x%04lx\n",
1414 iobase, iobase + 0x0f,
1416 iobase + 0x400 + (thisboard->size & 0x3ff));
1417 if (!request_region(iobase, 0x10, "das16")) {
1418 printk(" I/O port conflict: 0x%04lx-0x%04lx\n",
1419 iobase, iobase + 0x0f);
1422 if (!request_region(iobase + 0x400, thisboard->size & 0x3ff,
1424 release_region(iobase, 0x10);
1425 printk(" I/O port conflict: 0x%04lx-0x%04lx\n",
1427 iobase + 0x400 + (thisboard->size & 0x3ff));
1432 dev->iobase = iobase;
1434 /* probe id bits to make sure they are consistent */
1435 if (das16_probe(dev, it)) {
1436 printk(" id bits do not match selected board, aborting\n");
1439 dev->board_name = thisboard->name;
1441 /* get master clock speed */
1442 if (thisboard->size < 0x400) {
1444 devpriv->clockbase = 1000 / it->options[3];
1446 devpriv->clockbase = 1000; /* 1 MHz default */
1448 das1600_mode_detect(dev);
1451 /* now for the irq */
1452 if (irq > 1 && irq < 8) {
1453 ret = request_irq(irq, das16_dma_interrupt, 0, "das16", dev);
1458 printk(" ( irq = %u )", irq);
1459 } else if (irq == 0) {
1460 printk(" ( no irq )");
1462 printk(" invalid irq\n");
1466 /* initialize dma */
1467 dma_chan = it->options[2];
1468 if (dma_chan == 1 || dma_chan == 3) {
1469 /* allocate dma buffers */
1471 for (i = 0; i < 2; i++) {
1472 devpriv->dma_buffer[i] = pci_alloc_consistent(NULL,
1473 DAS16_DMA_SIZE, &devpriv->dma_buffer_addr[i]);
1474 if (devpriv->dma_buffer[i] == NULL)
1477 if (request_dma(dma_chan, "das16")) {
1478 printk(" failed to allocate dma channel %i\n",
1482 devpriv->dma_chan = dma_chan;
1483 flags = claim_dma_lock();
1484 disable_dma(devpriv->dma_chan);
1485 set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
1486 release_dma_lock(flags);
1487 printk(" ( dma = %u)\n", dma_chan);
1488 } else if (dma_chan == 0) {
1489 printk(" ( no dma )\n");
1491 printk(" invalid dma channel\n");
1495 /* get any user-defined input range */
1496 if (thisboard->ai_pg == das16_pg_none &&
1497 (it->options[4] || it->options[5])) {
1498 /* allocate single-range range table */
1499 devpriv->user_ai_range_table =
1500 kmalloc(sizeof(struct comedi_lrange) + sizeof(struct comedi_krange),
1502 /* initialize ai range */
1503 devpriv->user_ai_range_table->length = 1;
1504 user_ai_range = devpriv->user_ai_range_table->range;
1505 user_ai_range->min = it->options[4];
1506 user_ai_range->max = it->options[5];
1507 user_ai_range->flags = UNIT_volt;
1509 /* get any user-defined output range */
1510 if (it->options[6] || it->options[7]) {
1511 /* allocate single-range range table */
1512 devpriv->user_ao_range_table =
1513 kmalloc(sizeof(struct comedi_lrange) + sizeof(struct comedi_krange),
1515 /* initialize ao range */
1516 devpriv->user_ao_range_table->length = 1;
1517 user_ao_range = devpriv->user_ao_range_table->range;
1518 user_ao_range->min = it->options[6];
1519 user_ao_range->max = it->options[7];
1520 user_ao_range->flags = UNIT_volt;
1524 init_timer(&(devpriv->timer));
1525 devpriv->timer.function = das16_timer_interrupt;
1526 devpriv->timer.data = (unsigned long)dev;
1528 devpriv->timer_mode = timer_mode ? 1 : 0;
1530 ret = alloc_subdevices(dev, 5);
1534 s = dev->subdevices + 0;
1535 dev->read_subdev = s;
1537 if (thisboard->ai) {
1538 s->type = COMEDI_SUBD_AI;
1539 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
1540 if (devpriv->ai_singleended) {
1542 s->len_chanlist = 16;
1543 s->subdev_flags |= SDF_GROUND;
1546 s->len_chanlist = 8;
1547 s->subdev_flags |= SDF_DIFF;
1549 s->maxdata = (1 << thisboard->ai_nbits) - 1;
1550 if (devpriv->user_ai_range_table) { /* user defined ai range */
1551 s->range_table = devpriv->user_ai_range_table;
1552 } else if (devpriv->ai_unipolar) {
1553 s->range_table = das16_ai_uni_lranges[thisboard->ai_pg];
1555 s->range_table = das16_ai_bip_lranges[thisboard->ai_pg];
1557 s->insn_read = thisboard->ai;
1558 s->do_cmdtest = das16_cmd_test;
1559 s->do_cmd = das16_cmd_exec;
1560 s->cancel = das16_cancel;
1561 s->munge = das16_ai_munge;
1563 s->type = COMEDI_SUBD_UNUSED;
1566 s = dev->subdevices + 1;
1568 if (thisboard->ao) {
1569 s->type = COMEDI_SUBD_AO;
1570 s->subdev_flags = SDF_WRITABLE;
1572 s->maxdata = (1 << thisboard->ao_nbits) - 1;
1573 if (devpriv->user_ao_range_table) { /* user defined ao range */
1574 s->range_table = devpriv->user_ao_range_table;
1576 s->range_table = &range_unknown;
1578 s->insn_write = thisboard->ao;
1580 s->type = COMEDI_SUBD_UNUSED;
1583 s = dev->subdevices + 2;
1585 if (thisboard->di) {
1586 s->type = COMEDI_SUBD_DI;
1587 s->subdev_flags = SDF_READABLE;
1590 s->range_table = &range_digital;
1591 s->insn_bits = thisboard->di;
1593 s->type = COMEDI_SUBD_UNUSED;
1596 s = dev->subdevices + 3;
1598 if (thisboard->do_) {
1599 s->type = COMEDI_SUBD_DO;
1600 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1603 s->range_table = &range_digital;
1604 s->insn_bits = thisboard->do_;
1605 /* initialize digital output lines */
1606 outb(s->state, dev->iobase + DAS16_DIO);
1608 s->type = COMEDI_SUBD_UNUSED;
1611 s = dev->subdevices + 4;
1613 if (thisboard->i8255_offset != 0) {
1614 subdev_8255_init(dev, s, NULL, (dev->iobase +
1615 thisboard->i8255_offset));
1617 s->type = COMEDI_SUBD_UNUSED;
1621 /* set the interrupt level */
1622 devpriv->control_state = DAS16_IRQ(dev->irq);
1623 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1625 /* turn on das1600 mode if available */
1626 if (thisboard->size > 0x400) {
1627 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE);
1628 outb(0, dev->iobase + DAS1600_CONV);
1629 outb(0, dev->iobase + DAS1600_BURST);
1635 static int das16_detach(struct comedi_device *dev)
1637 printk("comedi%d: das16: remove\n", dev->minor);
1641 if (dev->subdevices)
1642 subdev_8255_cleanup(dev, dev->subdevices + 4);
1646 for (i = 0; i < 2; i++) {
1647 if (devpriv->dma_buffer[i])
1648 pci_free_consistent(NULL, DAS16_DMA_SIZE,
1649 devpriv->dma_buffer[i],
1650 devpriv->dma_buffer_addr[i]);
1652 if (devpriv->dma_chan)
1653 free_dma(devpriv->dma_chan);
1654 if (devpriv->user_ai_range_table)
1655 kfree(devpriv->user_ai_range_table);
1656 if (devpriv->user_ao_range_table)
1657 kfree(devpriv->user_ao_range_table);
1661 free_irq(dev->irq, dev);
1664 if (thisboard->size < 0x400) {
1665 release_region(dev->iobase, thisboard->size);
1667 release_region(dev->iobase, 0x10);
1668 release_region(dev->iobase + 0x400,
1669 thisboard->size & 0x3ff);
1676 COMEDI_INITCLEANUP(driver_das16);
1678 /* utility function that suggests a dma transfer size in bytes */
1679 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
1680 struct comedi_cmd cmd)
1685 /* if we are using timer interrupt, we don't care how long it
1686 * will take to complete transfer since it will be interrupted
1687 * by timer interrupt */
1688 if (devpriv->timer_mode)
1689 return DAS16_DMA_SIZE;
1691 /* otherwise, we are relying on dma terminal count interrupt,
1692 * so pick a reasonable size */
1693 if (cmd.convert_src == TRIG_TIMER)
1694 freq = 1000000000 / cmd.convert_arg;
1695 else if (cmd.scan_begin_src == TRIG_TIMER)
1696 freq = (1000000000 / cmd.scan_begin_arg) * cmd.chanlist_len;
1697 /* return some default value */
1701 if (cmd.flags & TRIG_WAKE_EOS) {
1702 size = sample_size * cmd.chanlist_len;
1704 /* make buffer fill in no more than 1/3 second */
1705 size = (freq / 3) * sample_size;
1708 /* set a minimum and maximum size allowed */
1709 if (size > DAS16_DMA_SIZE)
1710 size = DAS16_DMA_SIZE - DAS16_DMA_SIZE % sample_size;
1711 else if (size < sample_size)
1714 if (cmd.stop_src == TRIG_COUNT && size > devpriv->adc_byte_count)
1715 size = devpriv->adc_byte_count;
1720 static void das16_ai_munge(struct comedi_device *dev, struct comedi_subdevice *s,
1721 void *array, unsigned int num_bytes, unsigned int start_chan_index)
1723 unsigned int i, num_samples = num_bytes / sizeof(short);
1724 short *data = array;
1726 for (i = 0; i < num_samples; i++) {
1727 data[i] = le16_to_cpu(data[i]);
1728 if (thisboard->ai_nbits == 12) {
1729 data[i] = (data[i] >> 4) & 0xfff;