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, {
248 static const struct comedi_lrange range_das1x01_unip = { 4, {
256 static const struct comedi_lrange range_das1x02_bip = { 4, {
264 static const struct comedi_lrange range_das1x02_unip = { 4, {
272 static const struct comedi_lrange range_das16jr = { 9, {
273 /* also used by 16/330 */
286 static const struct comedi_lrange range_das16jr_16 = { 8, {
298 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
299 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
300 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
309 static const int *const das16_gainlists[] = {
317 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
325 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
335 unsigned have_byte:1;
338 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
339 struct comedi_insn *insn, unsigned int *data);
340 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
341 struct comedi_insn *insn, unsigned int *data);
342 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
343 struct comedi_insn *insn, unsigned int *data);
344 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
345 struct comedi_insn *insn, unsigned int *data);
347 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
348 struct comedi_cmd *cmd);
349 static int das16_cmd_exec(struct comedi_device *dev,
350 struct comedi_subdevice *s);
351 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
352 static void das16_ai_munge(struct comedi_device *dev,
353 struct comedi_subdevice *s, void *array,
354 unsigned int num_bytes,
355 unsigned int start_chan_index);
357 static void das16_reset(struct comedi_device *dev);
358 static irqreturn_t das16_dma_interrupt(int irq, void *d);
359 static void das16_timer_interrupt(unsigned long arg);
360 static void das16_interrupt(struct comedi_device *dev);
362 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
364 static int das1600_mode_detect(struct comedi_device *dev);
365 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
366 struct comedi_cmd cmd);
368 static void reg_dump(struct comedi_device *dev);
373 unsigned int ai_nbits;
374 unsigned int ai_speed; /* max conversion speed in nanosec */
377 unsigned int ao_nbits;
381 unsigned int i8255_offset;
382 unsigned int i8254_offset;
388 static const struct das16_board das16_boards[] = {
391 .ai = das16_ai_rinsn,
394 .ai_pg = das16_pg_none,
395 .ao = das16_ao_winsn,
397 .di = das16_di_rbits,
398 .do_ = das16_do_wbits,
399 .i8255_offset = 0x10,
400 .i8254_offset = 0x0c,
406 .ai = das16_ai_rinsn,
409 .ai_pg = das16_pg_none,
410 .ao = das16_ao_winsn,
412 .di = das16_di_rbits,
413 .do_ = das16_do_wbits,
414 .i8255_offset = 0x10,
415 .i8254_offset = 0x0c,
421 .ai = das16_ai_rinsn,
424 .ai_pg = das16_pg_none,
425 .ao = das16_ao_winsn,
427 .di = das16_di_rbits,
428 .do_ = das16_do_wbits,
429 .i8255_offset = 0x10,
430 .i8254_offset = 0x0c,
435 .name = "cio-das16", /* cio-das16.pdf */
436 .ai = das16_ai_rinsn,
439 .ai_pg = das16_pg_none,
440 .ao = das16_ao_winsn,
442 .di = das16_di_rbits,
443 .do_ = das16_do_wbits,
444 .i8255_offset = 0x10,
445 .i8254_offset = 0x0c,
450 .name = "cio-das16/f", /* das16.pdf */
451 .ai = das16_ai_rinsn,
454 .ai_pg = das16_pg_none,
455 .ao = das16_ao_winsn,
457 .di = das16_di_rbits,
458 .do_ = das16_do_wbits,
459 .i8255_offset = 0x10,
460 .i8254_offset = 0x0c,
465 .name = "cio-das16/jr", /* cio-das16jr.pdf */
466 .ai = das16_ai_rinsn,
469 .ai_pg = das16_pg_16jr,
471 .di = das16_di_rbits,
472 .do_ = das16_do_wbits,
474 .i8254_offset = 0x0c,
479 .name = "pc104-das16jr", /* pc104-das16jr_xx.pdf */
480 .ai = das16_ai_rinsn,
483 .ai_pg = das16_pg_16jr,
485 .di = das16_di_rbits,
486 .do_ = das16_do_wbits,
488 .i8254_offset = 0x0c,
493 .name = "cio-das16jr/16", /* cio-das16jr_16.pdf */
494 .ai = das16_ai_rinsn,
497 .ai_pg = das16_pg_16jr_16,
499 .di = das16_di_rbits,
500 .do_ = das16_do_wbits,
502 .i8254_offset = 0x0c,
507 .name = "pc104-das16jr/16", /* pc104-das16jr_xx.pdf */
508 .ai = das16_ai_rinsn,
511 .ai_pg = das16_pg_16jr_16,
513 .di = das16_di_rbits,
514 .do_ = das16_do_wbits,
516 .i8254_offset = 0x0c,
521 .name = "das-1201", /* 4924.pdf (keithley user's manual) */
522 .ai = das16_ai_rinsn,
525 .ai_pg = das16_pg_none,
527 .di = das16_di_rbits,
528 .do_ = das16_do_wbits,
529 .i8255_offset = 0x400,
530 .i8254_offset = 0x0c,
535 .name = "das-1202", /* 4924.pdf (keithley user's manual) */
536 .ai = das16_ai_rinsn,
539 .ai_pg = das16_pg_none,
541 .di = das16_di_rbits,
542 .do_ = das16_do_wbits,
543 .i8255_offset = 0x400,
544 .i8254_offset = 0x0c,
549 .name = "das-1401", /* 4919.pdf and 4922.pdf (keithley user's manual) */
550 .ai = das16_ai_rinsn,
553 .ai_pg = das16_pg_1601,
555 .di = das16_di_rbits,
556 .do_ = das16_do_wbits,
558 .i8254_offset = 0x0c,
560 .id = 0xc0 /* 4919.pdf says id bits are 0xe0, 4922.pdf says 0xc0 */
563 .name = "das-1402", /* 4919.pdf and 4922.pdf (keithley user's manual) */
564 .ai = das16_ai_rinsn,
567 .ai_pg = das16_pg_1602,
569 .di = das16_di_rbits,
570 .do_ = das16_do_wbits,
572 .i8254_offset = 0x0c,
574 .id = 0xc0 /* 4919.pdf says id bits are 0xe0, 4922.pdf says 0xc0 */
577 .name = "das-1601", /* 4919.pdf */
578 .ai = das16_ai_rinsn,
581 .ai_pg = das16_pg_1601,
582 .ao = das16_ao_winsn,
584 .di = das16_di_rbits,
585 .do_ = das16_do_wbits,
586 .i8255_offset = 0x400,
587 .i8254_offset = 0x0c,
591 .name = "das-1602", /* 4919.pdf */
592 .ai = das16_ai_rinsn,
595 .ai_pg = das16_pg_1602,
596 .ao = das16_ao_winsn,
598 .di = das16_di_rbits,
599 .do_ = das16_do_wbits,
600 .i8255_offset = 0x400,
601 .i8254_offset = 0x0c,
605 .name = "cio-das1401/12", /* cio-das1400_series.pdf */
606 .ai = das16_ai_rinsn,
609 .ai_pg = das16_pg_1601,
611 .di = das16_di_rbits,
612 .do_ = das16_do_wbits,
614 .i8254_offset = 0x0c,
618 .name = "cio-das1402/12", /* cio-das1400_series.pdf */
619 .ai = das16_ai_rinsn,
622 .ai_pg = das16_pg_1602,
624 .di = das16_di_rbits,
625 .do_ = das16_do_wbits,
627 .i8254_offset = 0x0c,
631 .name = "cio-das1402/16", /* cio-das1400_series.pdf */
632 .ai = das16_ai_rinsn,
635 .ai_pg = das16_pg_1602,
637 .di = das16_di_rbits,
638 .do_ = das16_do_wbits,
640 .i8254_offset = 0x0c,
644 .name = "cio-das1601/12", /* cio-das160x-1x.pdf */
645 .ai = das16_ai_rinsn,
648 .ai_pg = das16_pg_1601,
649 .ao = das16_ao_winsn,
651 .di = das16_di_rbits,
652 .do_ = das16_do_wbits,
653 .i8255_offset = 0x400,
654 .i8254_offset = 0x0c,
658 .name = "cio-das1602/12", /* cio-das160x-1x.pdf */
659 .ai = das16_ai_rinsn,
662 .ai_pg = das16_pg_1602,
663 .ao = das16_ao_winsn,
665 .di = das16_di_rbits,
666 .do_ = das16_do_wbits,
667 .i8255_offset = 0x400,
668 .i8254_offset = 0x0c,
672 .name = "cio-das1602/16", /* cio-das160x-1x.pdf */
673 .ai = das16_ai_rinsn,
676 .ai_pg = das16_pg_1602,
677 .ao = das16_ao_winsn,
679 .di = das16_di_rbits,
680 .do_ = das16_do_wbits,
681 .i8255_offset = 0x400,
682 .i8254_offset = 0x0c,
686 .name = "cio-das16/330", /* ? */
687 .ai = das16_ai_rinsn,
690 .ai_pg = das16_pg_16jr,
692 .di = das16_di_rbits,
693 .do_ = das16_do_wbits,
695 .i8254_offset = 0x0c,
700 .name = "das16/330i", /* ? */
703 .name = "das16/jr/ctr5", /* ? */
706 .name = "cio-das16/m1/16", /* cio-das16_m1_16.pdf, this board is a bit quirky, no dma */
711 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it);
712 static int das16_detach(struct comedi_device *dev);
713 static struct comedi_driver driver_das16 = {
714 .driver_name = "das16",
715 .module = THIS_MODULE,
716 .attach = das16_attach,
717 .detach = das16_detach,
718 .board_name = &das16_boards[0].name,
719 .num_names = ARRAY_SIZE(das16_boards),
720 .offset = sizeof(das16_boards[0]),
723 #define DAS16_TIMEOUT 1000
725 /* Period for timer interrupt in jiffies. It's a function
726 * to deal with possibility of dynamic HZ patches */
727 static inline int timer_period(void)
732 struct das16_private_struct {
733 unsigned int ai_unipolar; /* unipolar flag */
734 unsigned int ai_singleended; /* single ended flag */
735 unsigned int clockbase; /* master clock speed in ns */
736 volatile unsigned int control_state; /* dma, interrupt and trigger control bits */
737 volatile unsigned long adc_byte_count; /* number of bytes remaining */
738 unsigned int divisor1; /* divisor dividing master clock to get conversion frequency */
739 unsigned int divisor2; /* divisor dividing master clock to get conversion frequency */
740 unsigned int dma_chan; /* dma channel */
741 uint16_t *dma_buffer[2];
742 dma_addr_t dma_buffer_addr[2];
743 unsigned int current_buffer;
744 volatile unsigned int dma_transfer_size; /* target number of bytes to transfer per dma shot */
745 /* user-defined analog input and output ranges defined from config options */
746 struct comedi_lrange *user_ai_range_table;
747 struct comedi_lrange *user_ao_range_table;
749 struct timer_list timer; /* for timed interrupt */
750 volatile short timer_running;
751 volatile short timer_mode; /* true if using timer mode */
753 #define devpriv ((struct das16_private_struct *)(dev->private))
754 #define thisboard ((struct das16_board *)(dev->board_ptr))
756 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
757 struct comedi_cmd *cmd)
760 int gain, start_chan, i;
763 /* make sure triggers are valid */
764 tmp = cmd->start_src;
765 cmd->start_src &= TRIG_NOW;
766 if (!cmd->start_src || tmp != cmd->start_src)
769 tmp = cmd->scan_begin_src;
771 /* if board supports burst mode */
772 if (thisboard->size > 0x400)
773 mask |= TRIG_TIMER | TRIG_EXT;
774 cmd->scan_begin_src &= mask;
775 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
778 tmp = cmd->convert_src;
779 mask = TRIG_TIMER | TRIG_EXT;
780 /* if board supports burst mode */
781 if (thisboard->size > 0x400)
783 cmd->convert_src &= mask;
784 if (!cmd->convert_src || tmp != cmd->convert_src)
787 tmp = cmd->scan_end_src;
788 cmd->scan_end_src &= TRIG_COUNT;
789 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
793 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
794 if (!cmd->stop_src || tmp != cmd->stop_src)
800 /* step 2: make sure trigger sources are unique and mutually compatible */
801 if (cmd->scan_begin_src != TRIG_TIMER &&
802 cmd->scan_begin_src != TRIG_EXT &&
803 cmd->scan_begin_src != TRIG_FOLLOW)
805 if (cmd->convert_src != TRIG_TIMER &&
806 cmd->convert_src != TRIG_EXT && cmd->convert_src != TRIG_NOW)
808 if (cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_COUNT)
811 /* make sure scan_begin_src and convert_src dont conflict */
812 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
814 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
820 /* step 3: make sure arguments are trivially compatible */
821 if (cmd->start_arg != 0) {
826 if (cmd->scan_begin_src == TRIG_FOLLOW) {
827 /* internal trigger */
828 if (cmd->scan_begin_arg != 0) {
829 cmd->scan_begin_arg = 0;
834 if (cmd->scan_end_arg != cmd->chanlist_len) {
835 cmd->scan_end_arg = cmd->chanlist_len;
838 /* check against maximum frequency */
839 if (cmd->scan_begin_src == TRIG_TIMER) {
840 if (cmd->scan_begin_arg <
841 thisboard->ai_speed * cmd->chanlist_len) {
842 cmd->scan_begin_arg =
843 thisboard->ai_speed * cmd->chanlist_len;
847 if (cmd->convert_src == TRIG_TIMER) {
848 if (cmd->convert_arg < thisboard->ai_speed) {
849 cmd->convert_arg = thisboard->ai_speed;
854 if (cmd->stop_src == TRIG_NONE) {
855 if (cmd->stop_arg != 0) {
863 /* step 4: fix up arguments */
864 if (cmd->scan_begin_src == TRIG_TIMER) {
865 unsigned int tmp = cmd->scan_begin_arg;
866 /* set divisors, correct timing arguments */
867 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
868 &(devpriv->divisor1),
869 &(devpriv->divisor2),
870 &(cmd->scan_begin_arg),
871 cmd->flags & TRIG_ROUND_MASK);
872 err += (tmp != cmd->scan_begin_arg);
874 if (cmd->convert_src == TRIG_TIMER) {
875 unsigned int tmp = cmd->convert_arg;
876 /* set divisors, correct timing arguments */
877 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
878 &(devpriv->divisor1),
879 &(devpriv->divisor2),
881 cmd->flags & TRIG_ROUND_MASK);
882 err += (tmp != cmd->convert_arg);
887 /* check channel/gain list against card's limitations */
889 gain = CR_RANGE(cmd->chanlist[0]);
890 start_chan = CR_CHAN(cmd->chanlist[0]);
891 for (i = 1; i < cmd->chanlist_len; i++) {
892 if (CR_CHAN(cmd->chanlist[i]) !=
893 (start_chan + i) % s->n_chan) {
895 "entries in chanlist must be consecutive channels, counting upwards\n");
898 if (CR_RANGE(cmd->chanlist[i]) != gain) {
900 "entries in chanlist must all have the same gain\n");
911 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
913 struct comedi_async *async = s->async;
914 struct comedi_cmd *cmd = &async->cmd;
919 if (devpriv->dma_chan == 0 || (dev->irq == 0
920 && devpriv->timer_mode == 0)) {
922 "irq (or use of 'timer mode') dma required to execute comedi_cmd");
925 if (cmd->flags & TRIG_RT) {
927 "isa dma transfers cannot be performed with TRIG_RT, aborting");
931 devpriv->adc_byte_count =
932 cmd->stop_arg * cmd->chanlist_len * sizeof(uint16_t);
934 /* disable conversions for das1600 mode */
935 if (thisboard->size > 0x400) {
936 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV);
938 /* set scan limits */
939 byte = CR_CHAN(cmd->chanlist[0]);
940 byte |= CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]) << 4;
941 outb(byte, dev->iobase + DAS16_MUX);
943 /* set gain (this is also burst rate register but according to
944 * computer boards manual, burst rate does nothing, even on keithley cards) */
945 if (thisboard->ai_pg != das16_pg_none) {
946 range = CR_RANGE(cmd->chanlist[0]);
947 outb((das16_gainlists[thisboard->ai_pg])[range],
948 dev->iobase + DAS16_GAIN);
951 /* set counter mode and counts */
953 das16_set_pacer(dev, cmd->convert_arg,
954 cmd->flags & TRIG_ROUND_MASK);
955 DEBUG_PRINT("pacer period: %d ns\n", cmd->convert_arg);
957 /* enable counters */
959 /* Enable burst mode if appropriate. */
960 if (thisboard->size > 0x400) {
961 if (cmd->convert_src == TRIG_NOW) {
962 outb(DAS1600_BURST_VAL, dev->iobase + DAS1600_BURST);
963 /* set burst length */
964 byte |= BURST_LEN_BITS(cmd->chanlist_len - 1);
966 outb(0, dev->iobase + DAS1600_BURST);
969 outb(byte, dev->iobase + DAS16_PACER);
971 /* set up dma transfer */
972 flags = claim_dma_lock();
973 disable_dma(devpriv->dma_chan);
974 /* clear flip-flop to make sure 2-byte registers for
975 * count and address get set correctly */
976 clear_dma_ff(devpriv->dma_chan);
977 devpriv->current_buffer = 0;
978 set_dma_addr(devpriv->dma_chan,
979 devpriv->dma_buffer_addr[devpriv->current_buffer]);
980 /* set appropriate size of transfer */
981 devpriv->dma_transfer_size = das16_suggest_transfer_size(dev, *cmd);
982 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
983 enable_dma(devpriv->dma_chan);
984 release_dma_lock(flags);
986 /* set up interrupt */
987 if (devpriv->timer_mode) {
988 devpriv->timer_running = 1;
989 devpriv->timer.expires = jiffies + timer_period();
990 add_timer(&devpriv->timer);
991 devpriv->control_state &= ~DAS16_INTE;
993 /* clear interrupt bit */
994 outb(0x00, dev->iobase + DAS16_STATUS);
995 /* enable interrupts */
996 devpriv->control_state |= DAS16_INTE;
998 devpriv->control_state |= DMA_ENABLE;
999 devpriv->control_state &= ~PACING_MASK;
1000 if (cmd->convert_src == TRIG_EXT)
1001 devpriv->control_state |= EXT_PACER;
1003 devpriv->control_state |= INT_PACER;
1004 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1006 /* Enable conversions if using das1600 mode */
1007 if (thisboard->size > 0x400) {
1008 outb(0, dev->iobase + DAS1600_CONV);
1014 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1016 unsigned long flags;
1018 spin_lock_irqsave(&dev->spinlock, flags);
1019 /* disable interrupts, dma and pacer clocked conversions */
1020 devpriv->control_state &= ~DAS16_INTE & ~PACING_MASK & ~DMA_ENABLE;
1021 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1022 if (devpriv->dma_chan)
1023 disable_dma(devpriv->dma_chan);
1025 /* disable SW timer */
1026 if (devpriv->timer_mode && devpriv->timer_running) {
1027 devpriv->timer_running = 0;
1028 del_timer(&devpriv->timer);
1031 /* disable burst mode */
1032 if (thisboard->size > 0x400) {
1033 outb(0, dev->iobase + DAS1600_BURST);
1036 spin_unlock_irqrestore(&dev->spinlock, flags);
1041 static void das16_reset(struct comedi_device *dev)
1043 outb(0, dev->iobase + DAS16_STATUS);
1044 outb(0, dev->iobase + DAS16_CONTROL);
1045 outb(0, dev->iobase + DAS16_PACER);
1046 outb(0, dev->iobase + DAS16_CNTR_CONTROL);
1049 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1050 struct comedi_insn *insn, unsigned int *data)
1057 /* disable interrupts and pacing */
1058 devpriv->control_state &= ~DAS16_INTE & ~DMA_ENABLE & ~PACING_MASK;
1059 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1061 /* set multiplexer */
1062 chan = CR_CHAN(insn->chanspec);
1063 chan |= CR_CHAN(insn->chanspec) << 4;
1064 outb(chan, dev->iobase + DAS16_MUX);
1067 if (thisboard->ai_pg != das16_pg_none) {
1068 range = CR_RANGE(insn->chanspec);
1069 outb((das16_gainlists[thisboard->ai_pg])[range],
1070 dev->iobase + DAS16_GAIN);
1073 for (n = 0; n < insn->n; n++) {
1074 /* trigger conversion */
1075 outb_p(0, dev->iobase + DAS16_TRIG);
1077 for (i = 0; i < DAS16_TIMEOUT; i++) {
1078 if (!(inb(dev->iobase + DAS16_STATUS) & BUSY))
1081 if (i == DAS16_TIMEOUT) {
1082 printk("das16: timeout\n");
1085 msb = inb(dev->iobase + DAS16_AI_MSB);
1086 lsb = inb(dev->iobase + DAS16_AI_LSB);
1087 if (thisboard->ai_nbits == 12) {
1088 data[n] = ((lsb >> 4) & 0xf) | (msb << 4);
1090 data[n] = lsb | (msb << 8);
1097 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
1098 struct comedi_insn *insn, unsigned int *data)
1102 bits = inb(dev->iobase + DAS16_DIO) & 0xf;
1109 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
1110 struct comedi_insn *insn, unsigned int *data)
1114 /* only set bits that have been masked */
1117 /* zero bits that have been masked */
1119 /* set masked bits */
1120 wbits |= data[0] & data[1];
1124 outb(s->state, dev->iobase + DAS16_DIO);
1129 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1130 struct comedi_insn *insn, unsigned int *data)
1136 chan = CR_CHAN(insn->chanspec);
1138 for (i = 0; i < insn->n; i++) {
1139 if (thisboard->ao_nbits == 12) {
1140 lsb = (data[i] << 4) & 0xff;
1141 msb = (data[i] >> 4) & 0xff;
1143 lsb = data[i] & 0xff;
1144 msb = (data[i] >> 8) & 0xff;
1146 outb(lsb, dev->iobase + DAS16_AO_LSB(chan));
1147 outb(msb, dev->iobase + DAS16_AO_MSB(chan));
1153 static irqreturn_t das16_dma_interrupt(int irq, void *d)
1156 struct comedi_device *dev = d;
1158 status = inb(dev->iobase + DAS16_STATUS);
1160 if ((status & DAS16_INT) == 0) {
1161 DEBUG_PRINT("spurious interrupt\n");
1165 /* clear interrupt */
1166 outb(0x00, dev->iobase + DAS16_STATUS);
1167 das16_interrupt(dev);
1171 static void das16_timer_interrupt(unsigned long arg)
1173 struct comedi_device *dev = (struct comedi_device *)arg;
1175 das16_interrupt(dev);
1177 if (devpriv->timer_running)
1178 mod_timer(&devpriv->timer, jiffies + timer_period());
1181 /* the pc104-das16jr (at least) has problems if the dma
1182 transfer is interrupted in the middle of transferring
1183 a 16 bit sample, so this function takes care to get
1184 an even transfer count after disabling dma
1187 static int disable_dma_on_even(struct comedi_device *dev)
1191 static const int disable_limit = 100;
1192 static const int enable_timeout = 100;
1193 disable_dma(devpriv->dma_chan);
1194 residue = get_dma_residue(devpriv->dma_chan);
1195 for (i = 0; i < disable_limit && (residue % 2); ++i) {
1197 enable_dma(devpriv->dma_chan);
1198 for (j = 0; j < enable_timeout; ++j) {
1201 new_residue = get_dma_residue(devpriv->dma_chan);
1202 if (new_residue != residue)
1205 disable_dma(devpriv->dma_chan);
1206 residue = get_dma_residue(devpriv->dma_chan);
1208 if (i == disable_limit) {
1210 "failed to get an even dma transfer, could be trouble.");
1215 static void das16_interrupt(struct comedi_device *dev)
1217 unsigned long dma_flags, spin_flags;
1218 struct comedi_subdevice *s = dev->read_subdev;
1219 struct comedi_async *async;
1220 struct comedi_cmd *cmd;
1221 int num_bytes, residue;
1224 if (dev->attached == 0) {
1225 comedi_error(dev, "premature interrupt");
1228 /* initialize async here to make sure it is not NULL */
1232 if (devpriv->dma_chan == 0) {
1233 comedi_error(dev, "interrupt with no dma channel?");
1237 spin_lock_irqsave(&dev->spinlock, spin_flags);
1238 if ((devpriv->control_state & DMA_ENABLE) == 0) {
1239 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
1240 DEBUG_PRINT("interrupt while dma disabled?\n");
1244 dma_flags = claim_dma_lock();
1245 clear_dma_ff(devpriv->dma_chan);
1246 residue = disable_dma_on_even(dev);
1248 /* figure out how many points to read */
1249 if (residue > devpriv->dma_transfer_size) {
1250 comedi_error(dev, "residue > transfer size!\n");
1251 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1254 num_bytes = devpriv->dma_transfer_size - residue;
1256 if (cmd->stop_src == TRIG_COUNT && num_bytes >= devpriv->adc_byte_count) {
1257 num_bytes = devpriv->adc_byte_count;
1258 async->events |= COMEDI_CB_EOA;
1261 buffer_index = devpriv->current_buffer;
1262 devpriv->current_buffer = (devpriv->current_buffer + 1) % 2;
1263 devpriv->adc_byte_count -= num_bytes;
1265 /* figure out how many bytes for next transfer */
1266 if (cmd->stop_src == TRIG_COUNT && devpriv->timer_mode == 0 &&
1267 devpriv->dma_transfer_size > devpriv->adc_byte_count)
1268 devpriv->dma_transfer_size = devpriv->adc_byte_count;
1271 if ((async->events & COMEDI_CB_EOA) == 0) {
1272 set_dma_addr(devpriv->dma_chan,
1273 devpriv->dma_buffer_addr[devpriv->current_buffer]);
1274 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
1275 enable_dma(devpriv->dma_chan);
1276 /* reenable conversions for das1600 mode, (stupid hardware) */
1277 if (thisboard->size > 0x400 && devpriv->timer_mode == 0) {
1278 outb(0x00, dev->iobase + DAS1600_CONV);
1281 release_dma_lock(dma_flags);
1283 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
1285 cfc_write_array_to_buffer(s,
1286 devpriv->dma_buffer[buffer_index], num_bytes);
1288 cfc_handle_events(dev, s);
1291 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
1294 i8253_cascade_ns_to_timer_2div(devpriv->clockbase, &(devpriv->divisor1),
1295 &(devpriv->divisor2), &ns,
1296 rounding_flags & TRIG_ROUND_MASK);
1298 /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
1299 i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 1, devpriv->divisor1, 2);
1300 i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 2, devpriv->divisor2, 2);
1305 static void reg_dump(struct comedi_device *dev)
1307 DEBUG_PRINT("********DAS1600 REGISTER DUMP********\n");
1308 DEBUG_PRINT("DAS16_MUX: %x\n", inb(dev->iobase + DAS16_MUX));
1309 DEBUG_PRINT("DAS16_DIO: %x\n", inb(dev->iobase + DAS16_DIO));
1310 DEBUG_PRINT("DAS16_STATUS: %x\n", inb(dev->iobase + DAS16_STATUS));
1311 DEBUG_PRINT("DAS16_CONTROL: %x\n", inb(dev->iobase + DAS16_CONTROL));
1312 DEBUG_PRINT("DAS16_PACER: %x\n", inb(dev->iobase + DAS16_PACER));
1313 DEBUG_PRINT("DAS16_GAIN: %x\n", inb(dev->iobase + DAS16_GAIN));
1314 DEBUG_PRINT("DAS16_CNTR_CONTROL: %x\n",
1315 inb(dev->iobase + DAS16_CNTR_CONTROL));
1316 DEBUG_PRINT("DAS1600_CONV: %x\n", inb(dev->iobase + DAS1600_CONV));
1317 DEBUG_PRINT("DAS1600_BURST: %x\n", inb(dev->iobase + DAS1600_BURST));
1318 DEBUG_PRINT("DAS1600_ENABLE: %x\n", inb(dev->iobase + DAS1600_ENABLE));
1319 DEBUG_PRINT("DAS1600_STATUS_B: %x\n",
1320 inb(dev->iobase + DAS1600_STATUS_B));
1323 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
1328 /* status is available on all boards */
1330 status = inb(dev->iobase + DAS16_STATUS);
1332 if ((status & UNIPOLAR)) {
1333 devpriv->ai_unipolar = 1;
1335 devpriv->ai_unipolar = 0;
1338 if ((status & DAS16_MUXBIT)) {
1339 devpriv->ai_singleended = 1;
1341 devpriv->ai_singleended = 0;
1344 /* diobits indicates boards */
1346 diobits = inb(dev->iobase + DAS16_DIO) & 0xf0;
1348 printk(" id bits are 0x%02x\n", diobits);
1349 if (thisboard->id != diobits) {
1350 printk(" requested board's id bits are 0x%x (ignore)\n",
1357 static int das1600_mode_detect(struct comedi_device *dev)
1361 status = inb(dev->iobase + DAS1600_STATUS_B);
1363 if (status & DAS1600_CLK_10MHZ) {
1364 devpriv->clockbase = 100;
1365 printk(" 10MHz pacer clock\n");
1367 devpriv->clockbase = 1000;
1368 printk(" 1MHz pacer clock\n");
1382 * 3 Clock speed (in MHz)
1385 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1387 struct comedi_subdevice *s;
1390 unsigned long iobase;
1391 unsigned int dma_chan;
1393 unsigned long flags;
1394 struct comedi_krange *user_ai_range, *user_ao_range;
1396 iobase = it->options[0];
1398 irq = it->options[1];
1399 timer_mode = it->options[8];
1401 /* always use time_mode since using irq can drop samples while
1402 * waiting for dma done interrupt (due to hardware limitations) */
1408 printk("comedi%d: das16:", dev->minor);
1410 /* check that clock setting is valid */
1411 if (it->options[3]) {
1412 if (it->options[3] != 0 &&
1413 it->options[3] != 1 && it->options[3] != 10) {
1415 ("\n Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
1420 ret = alloc_private(dev, sizeof(struct das16_private_struct));
1424 if (thisboard->size < 0x400) {
1425 printk(" 0x%04lx-0x%04lx\n", iobase, iobase + thisboard->size);
1426 if (!request_region(iobase, thisboard->size, "das16")) {
1427 printk(" I/O port conflict\n");
1431 printk(" 0x%04lx-0x%04lx 0x%04lx-0x%04lx\n",
1432 iobase, iobase + 0x0f,
1434 iobase + 0x400 + (thisboard->size & 0x3ff));
1435 if (!request_region(iobase, 0x10, "das16")) {
1436 printk(" I/O port conflict: 0x%04lx-0x%04lx\n",
1437 iobase, iobase + 0x0f);
1440 if (!request_region(iobase + 0x400, thisboard->size & 0x3ff,
1442 release_region(iobase, 0x10);
1443 printk(" I/O port conflict: 0x%04lx-0x%04lx\n",
1445 iobase + 0x400 + (thisboard->size & 0x3ff));
1450 dev->iobase = iobase;
1452 /* probe id bits to make sure they are consistent */
1453 if (das16_probe(dev, it)) {
1454 printk(" id bits do not match selected board, aborting\n");
1457 dev->board_name = thisboard->name;
1459 /* get master clock speed */
1460 if (thisboard->size < 0x400) {
1462 devpriv->clockbase = 1000 / it->options[3];
1464 devpriv->clockbase = 1000; /* 1 MHz default */
1466 das1600_mode_detect(dev);
1469 /* now for the irq */
1470 if (irq > 1 && irq < 8) {
1471 ret = request_irq(irq, das16_dma_interrupt, 0, "das16", dev);
1476 printk(" ( irq = %u )", irq);
1477 } else if (irq == 0) {
1478 printk(" ( no irq )");
1480 printk(" invalid irq\n");
1484 /* initialize dma */
1485 dma_chan = it->options[2];
1486 if (dma_chan == 1 || dma_chan == 3) {
1487 /* allocate dma buffers */
1489 for (i = 0; i < 2; i++) {
1490 devpriv->dma_buffer[i] = pci_alloc_consistent(NULL,
1495 if (devpriv->dma_buffer[i] == NULL)
1498 if (request_dma(dma_chan, "das16")) {
1499 printk(" failed to allocate dma channel %i\n",
1503 devpriv->dma_chan = dma_chan;
1504 flags = claim_dma_lock();
1505 disable_dma(devpriv->dma_chan);
1506 set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
1507 release_dma_lock(flags);
1508 printk(" ( dma = %u)\n", dma_chan);
1509 } else if (dma_chan == 0) {
1510 printk(" ( no dma )\n");
1512 printk(" invalid dma channel\n");
1516 /* get any user-defined input range */
1517 if (thisboard->ai_pg == das16_pg_none &&
1518 (it->options[4] || it->options[5])) {
1519 /* allocate single-range range table */
1520 devpriv->user_ai_range_table =
1521 kmalloc(sizeof(struct comedi_lrange) +
1522 sizeof(struct comedi_krange), GFP_KERNEL);
1523 /* initialize ai range */
1524 devpriv->user_ai_range_table->length = 1;
1525 user_ai_range = devpriv->user_ai_range_table->range;
1526 user_ai_range->min = it->options[4];
1527 user_ai_range->max = it->options[5];
1528 user_ai_range->flags = UNIT_volt;
1530 /* get any user-defined output range */
1531 if (it->options[6] || it->options[7]) {
1532 /* allocate single-range range table */
1533 devpriv->user_ao_range_table =
1534 kmalloc(sizeof(struct comedi_lrange) +
1535 sizeof(struct comedi_krange), GFP_KERNEL);
1536 /* initialize ao range */
1537 devpriv->user_ao_range_table->length = 1;
1538 user_ao_range = devpriv->user_ao_range_table->range;
1539 user_ao_range->min = it->options[6];
1540 user_ao_range->max = it->options[7];
1541 user_ao_range->flags = UNIT_volt;
1545 init_timer(&(devpriv->timer));
1546 devpriv->timer.function = das16_timer_interrupt;
1547 devpriv->timer.data = (unsigned long)dev;
1549 devpriv->timer_mode = timer_mode ? 1 : 0;
1551 ret = alloc_subdevices(dev, 5);
1555 s = dev->subdevices + 0;
1556 dev->read_subdev = s;
1558 if (thisboard->ai) {
1559 s->type = COMEDI_SUBD_AI;
1560 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
1561 if (devpriv->ai_singleended) {
1563 s->len_chanlist = 16;
1564 s->subdev_flags |= SDF_GROUND;
1567 s->len_chanlist = 8;
1568 s->subdev_flags |= SDF_DIFF;
1570 s->maxdata = (1 << thisboard->ai_nbits) - 1;
1571 if (devpriv->user_ai_range_table) { /* user defined ai range */
1572 s->range_table = devpriv->user_ai_range_table;
1573 } else if (devpriv->ai_unipolar) {
1574 s->range_table = das16_ai_uni_lranges[thisboard->ai_pg];
1576 s->range_table = das16_ai_bip_lranges[thisboard->ai_pg];
1578 s->insn_read = thisboard->ai;
1579 s->do_cmdtest = das16_cmd_test;
1580 s->do_cmd = das16_cmd_exec;
1581 s->cancel = das16_cancel;
1582 s->munge = das16_ai_munge;
1584 s->type = COMEDI_SUBD_UNUSED;
1587 s = dev->subdevices + 1;
1589 if (thisboard->ao) {
1590 s->type = COMEDI_SUBD_AO;
1591 s->subdev_flags = SDF_WRITABLE;
1593 s->maxdata = (1 << thisboard->ao_nbits) - 1;
1594 if (devpriv->user_ao_range_table) { /* user defined ao range */
1595 s->range_table = devpriv->user_ao_range_table;
1597 s->range_table = &range_unknown;
1599 s->insn_write = thisboard->ao;
1601 s->type = COMEDI_SUBD_UNUSED;
1604 s = dev->subdevices + 2;
1606 if (thisboard->di) {
1607 s->type = COMEDI_SUBD_DI;
1608 s->subdev_flags = SDF_READABLE;
1611 s->range_table = &range_digital;
1612 s->insn_bits = thisboard->di;
1614 s->type = COMEDI_SUBD_UNUSED;
1617 s = dev->subdevices + 3;
1619 if (thisboard->do_) {
1620 s->type = COMEDI_SUBD_DO;
1621 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1624 s->range_table = &range_digital;
1625 s->insn_bits = thisboard->do_;
1626 /* initialize digital output lines */
1627 outb(s->state, dev->iobase + DAS16_DIO);
1629 s->type = COMEDI_SUBD_UNUSED;
1632 s = dev->subdevices + 4;
1634 if (thisboard->i8255_offset != 0) {
1635 subdev_8255_init(dev, s, NULL, (dev->iobase +
1636 thisboard->i8255_offset));
1638 s->type = COMEDI_SUBD_UNUSED;
1642 /* set the interrupt level */
1643 devpriv->control_state = DAS16_IRQ(dev->irq);
1644 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1646 /* turn on das1600 mode if available */
1647 if (thisboard->size > 0x400) {
1648 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE);
1649 outb(0, dev->iobase + DAS1600_CONV);
1650 outb(0, dev->iobase + DAS1600_BURST);
1656 static int das16_detach(struct comedi_device *dev)
1658 printk("comedi%d: das16: remove\n", dev->minor);
1662 if (dev->subdevices)
1663 subdev_8255_cleanup(dev, dev->subdevices + 4);
1667 for (i = 0; i < 2; i++) {
1668 if (devpriv->dma_buffer[i])
1669 pci_free_consistent(NULL, DAS16_DMA_SIZE,
1670 devpriv->dma_buffer[i],
1672 dma_buffer_addr[i]);
1674 if (devpriv->dma_chan)
1675 free_dma(devpriv->dma_chan);
1676 if (devpriv->user_ai_range_table)
1677 kfree(devpriv->user_ai_range_table);
1678 if (devpriv->user_ao_range_table)
1679 kfree(devpriv->user_ao_range_table);
1683 free_irq(dev->irq, dev);
1686 if (thisboard->size < 0x400) {
1687 release_region(dev->iobase, thisboard->size);
1689 release_region(dev->iobase, 0x10);
1690 release_region(dev->iobase + 0x400,
1691 thisboard->size & 0x3ff);
1698 COMEDI_INITCLEANUP(driver_das16);
1700 /* utility function that suggests a dma transfer size in bytes */
1701 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
1702 struct comedi_cmd cmd)
1707 /* if we are using timer interrupt, we don't care how long it
1708 * will take to complete transfer since it will be interrupted
1709 * by timer interrupt */
1710 if (devpriv->timer_mode)
1711 return DAS16_DMA_SIZE;
1713 /* otherwise, we are relying on dma terminal count interrupt,
1714 * so pick a reasonable size */
1715 if (cmd.convert_src == TRIG_TIMER)
1716 freq = 1000000000 / cmd.convert_arg;
1717 else if (cmd.scan_begin_src == TRIG_TIMER)
1718 freq = (1000000000 / cmd.scan_begin_arg) * cmd.chanlist_len;
1719 /* return some default value */
1723 if (cmd.flags & TRIG_WAKE_EOS) {
1724 size = sample_size * cmd.chanlist_len;
1726 /* make buffer fill in no more than 1/3 second */
1727 size = (freq / 3) * sample_size;
1730 /* set a minimum and maximum size allowed */
1731 if (size > DAS16_DMA_SIZE)
1732 size = DAS16_DMA_SIZE - DAS16_DMA_SIZE % sample_size;
1733 else if (size < sample_size)
1736 if (cmd.stop_src == TRIG_COUNT && size > devpriv->adc_byte_count)
1737 size = devpriv->adc_byte_count;
1742 static void das16_ai_munge(struct comedi_device *dev,
1743 struct comedi_subdevice *s, void *array,
1744 unsigned int num_bytes,
1745 unsigned int start_chan_index)
1747 unsigned int i, num_samples = num_bytes / sizeof(short);
1748 short *data = array;
1750 for (i = 0; i < num_samples; i++) {
1751 data[i] = le16_to_cpu(data[i]);
1752 if (thisboard->ai_nbits == 12) {
1753 data[i] = (data[i] >> 4) & 0xfff;