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/slab.h>
83 #include <linux/interrupt.h>
85 #include "../comedidev.h"
89 #include "comedi_fc.h"
95 #define DEBUG_PRINT(format, args...) printk("das16: " format, ## args)
97 #define DEBUG_PRINT(format, args...)
100 #define DAS16_SIZE 20 /* number of ioports */
101 #define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */
109 0 a/d bits 0-3 start 12 bit
110 1 a/d bits 4-11 unused
117 8 status eoc uni/bip interrupt reset
118 9 dma, int, trig ctrl set dma, int
119 a pacer control unused
131 0 a/d bits 0-3 start 12 bit
132 1 a/d bits 4-11 unused
136 8 status eoc uni/bip interrupt reset
137 9 dma, int, trig ctrl set dma, int
138 a pacer control unused
139 b gain status gain control
149 0 a/d bits 0-7 start 16 bit
150 1 a/d bits 8-15 unused
154 8 status eoc uni/bip interrupt reset
155 9 dma, int, trig ctrl set dma, int
156 a pacer control unused
157 b gain status gain control
168 0 a/d bits 0-3 start 12 bit
169 1 a/d bits 4-11 unused
176 8 status eoc uni/bip interrupt reset
177 9 dma, int, trig ctrl set dma, int
178 a pacer control unused
179 b gain status gain control
182 404 unused conversion enable
183 405 unused burst enable
184 406 unused das1600 enable
189 static const int sample_size = 2; /* size in bytes of a sample from board */
192 #define DAS16_AI_LSB 0
193 #define DAS16_AI_MSB 1
196 #define DAS16_AO_LSB(x) ((x)?6:4)
197 #define DAS16_AO_MSB(x) ((x)?7:5)
198 #define DAS16_STATUS 8
200 #define UNIPOLAR (1<<6)
201 #define DAS16_MUXBIT (1<<5)
202 #define DAS16_INT (1<<4)
203 #define DAS16_CONTROL 9
204 #define DAS16_INTE (1<<7)
205 #define DAS16_IRQ(x) (((x) & 0x7) << 4)
206 #define DMA_ENABLE (1<<2)
207 #define PACING_MASK 0x3
208 #define INT_PACER 0x03
209 #define EXT_PACER 0x02
210 #define DAS16_SOFT 0x00
211 #define DAS16_PACER 0x0A
212 #define DAS16_CTR0 (1<<1)
213 #define DAS16_TRIG0 (1<<0)
214 #define BURST_LEN_BITS(x) (((x) & 0xf) << 4)
215 #define DAS16_GAIN 0x0B
216 #define DAS16_CNTR0_DATA 0x0C
217 #define DAS16_CNTR1_DATA 0x0D
218 #define DAS16_CNTR2_DATA 0x0E
219 #define DAS16_CNTR_CONTROL 0x0F
220 #define DAS16_TERM_CNT 0x00
221 #define DAS16_ONE_SHOT 0x02
222 #define DAS16_RATE_GEN 0x04
223 #define DAS16_CNTR_LSB_MSB 0x30
224 #define DAS16_CNTR0 0x00
225 #define DAS16_CNTR1 0x40
226 #define DAS16_CNTR2 0x80
228 #define DAS1600_CONV 0x404
229 #define DAS1600_CONV_DISABLE 0x40
230 #define DAS1600_BURST 0x405
231 #define DAS1600_BURST_VAL 0x40
232 #define DAS1600_ENABLE 0x406
233 #define DAS1600_ENABLE_VAL 0x40
234 #define DAS1600_STATUS_B 0x407
235 #define DAS1600_BME 0x40
236 #define DAS1600_ME 0x20
237 #define DAS1600_CD 0x10
238 #define DAS1600_WS 0x02
239 #define DAS1600_CLK_10MHZ 0x01
241 static const struct comedi_lrange range_das1x01_bip = { 4, {
249 static const struct comedi_lrange range_das1x01_unip = { 4, {
257 static const struct comedi_lrange range_das1x02_bip = { 4, {
265 static const struct comedi_lrange range_das1x02_unip = { 4, {
273 static const struct comedi_lrange range_das16jr = { 9, {
274 /* also used by 16/330 */
287 static const struct comedi_lrange range_das16jr_16 = { 8, {
299 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
300 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
301 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
310 static const int *const das16_gainlists[] = {
318 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
326 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
336 unsigned have_byte:1;
339 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
340 struct comedi_insn *insn, unsigned int *data);
341 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
342 struct comedi_insn *insn, unsigned int *data);
343 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
344 struct comedi_insn *insn, unsigned int *data);
345 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
346 struct comedi_insn *insn, unsigned int *data);
348 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
349 struct comedi_cmd *cmd);
350 static int das16_cmd_exec(struct comedi_device *dev,
351 struct comedi_subdevice *s);
352 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
353 static void das16_ai_munge(struct comedi_device *dev,
354 struct comedi_subdevice *s, void *array,
355 unsigned int num_bytes,
356 unsigned int start_chan_index);
358 static void das16_reset(struct comedi_device *dev);
359 static irqreturn_t das16_dma_interrupt(int irq, void *d);
360 static void das16_timer_interrupt(unsigned long arg);
361 static void das16_interrupt(struct comedi_device *dev);
363 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
365 static int das1600_mode_detect(struct comedi_device *dev);
366 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
367 struct comedi_cmd cmd);
369 static void reg_dump(struct comedi_device *dev);
374 unsigned int ai_nbits;
375 unsigned int ai_speed; /* max conversion speed in nanosec */
378 unsigned int ao_nbits;
382 unsigned int i8255_offset;
383 unsigned int i8254_offset;
389 static const struct das16_board das16_boards[] = {
392 .ai = das16_ai_rinsn,
395 .ai_pg = das16_pg_none,
396 .ao = das16_ao_winsn,
398 .di = das16_di_rbits,
399 .do_ = das16_do_wbits,
400 .i8255_offset = 0x10,
401 .i8254_offset = 0x0c,
407 .ai = das16_ai_rinsn,
410 .ai_pg = das16_pg_none,
411 .ao = das16_ao_winsn,
413 .di = das16_di_rbits,
414 .do_ = das16_do_wbits,
415 .i8255_offset = 0x10,
416 .i8254_offset = 0x0c,
422 .ai = das16_ai_rinsn,
425 .ai_pg = das16_pg_none,
426 .ao = das16_ao_winsn,
428 .di = das16_di_rbits,
429 .do_ = das16_do_wbits,
430 .i8255_offset = 0x10,
431 .i8254_offset = 0x0c,
436 .name = "cio-das16", /* cio-das16.pdf */
437 .ai = das16_ai_rinsn,
440 .ai_pg = das16_pg_none,
441 .ao = das16_ao_winsn,
443 .di = das16_di_rbits,
444 .do_ = das16_do_wbits,
445 .i8255_offset = 0x10,
446 .i8254_offset = 0x0c,
451 .name = "cio-das16/f", /* das16.pdf */
452 .ai = das16_ai_rinsn,
455 .ai_pg = das16_pg_none,
456 .ao = das16_ao_winsn,
458 .di = das16_di_rbits,
459 .do_ = das16_do_wbits,
460 .i8255_offset = 0x10,
461 .i8254_offset = 0x0c,
466 .name = "cio-das16/jr", /* cio-das16jr.pdf */
467 .ai = das16_ai_rinsn,
470 .ai_pg = das16_pg_16jr,
472 .di = das16_di_rbits,
473 .do_ = das16_do_wbits,
475 .i8254_offset = 0x0c,
480 .name = "pc104-das16jr", /* pc104-das16jr_xx.pdf */
481 .ai = das16_ai_rinsn,
484 .ai_pg = das16_pg_16jr,
486 .di = das16_di_rbits,
487 .do_ = das16_do_wbits,
489 .i8254_offset = 0x0c,
494 .name = "cio-das16jr/16", /* cio-das16jr_16.pdf */
495 .ai = das16_ai_rinsn,
498 .ai_pg = das16_pg_16jr_16,
500 .di = das16_di_rbits,
501 .do_ = das16_do_wbits,
503 .i8254_offset = 0x0c,
508 .name = "pc104-das16jr/16", /* pc104-das16jr_xx.pdf */
509 .ai = das16_ai_rinsn,
512 .ai_pg = das16_pg_16jr_16,
514 .di = das16_di_rbits,
515 .do_ = das16_do_wbits,
517 .i8254_offset = 0x0c,
522 .name = "das-1201", /* 4924.pdf (keithley user's manual) */
523 .ai = das16_ai_rinsn,
526 .ai_pg = das16_pg_none,
528 .di = das16_di_rbits,
529 .do_ = das16_do_wbits,
530 .i8255_offset = 0x400,
531 .i8254_offset = 0x0c,
536 .name = "das-1202", /* 4924.pdf (keithley user's manual) */
537 .ai = das16_ai_rinsn,
540 .ai_pg = das16_pg_none,
542 .di = das16_di_rbits,
543 .do_ = das16_do_wbits,
544 .i8255_offset = 0x400,
545 .i8254_offset = 0x0c,
550 .name = "das-1401", /* 4919.pdf and 4922.pdf (keithley user's manual) */
551 .ai = das16_ai_rinsn,
554 .ai_pg = das16_pg_1601,
556 .di = das16_di_rbits,
557 .do_ = das16_do_wbits,
559 .i8254_offset = 0x0c,
561 .id = 0xc0 /* 4919.pdf says id bits are 0xe0, 4922.pdf says 0xc0 */
564 .name = "das-1402", /* 4919.pdf and 4922.pdf (keithley user's manual) */
565 .ai = das16_ai_rinsn,
568 .ai_pg = das16_pg_1602,
570 .di = das16_di_rbits,
571 .do_ = das16_do_wbits,
573 .i8254_offset = 0x0c,
575 .id = 0xc0 /* 4919.pdf says id bits are 0xe0, 4922.pdf says 0xc0 */
578 .name = "das-1601", /* 4919.pdf */
579 .ai = das16_ai_rinsn,
582 .ai_pg = das16_pg_1601,
583 .ao = das16_ao_winsn,
585 .di = das16_di_rbits,
586 .do_ = das16_do_wbits,
587 .i8255_offset = 0x400,
588 .i8254_offset = 0x0c,
592 .name = "das-1602", /* 4919.pdf */
593 .ai = das16_ai_rinsn,
596 .ai_pg = das16_pg_1602,
597 .ao = das16_ao_winsn,
599 .di = das16_di_rbits,
600 .do_ = das16_do_wbits,
601 .i8255_offset = 0x400,
602 .i8254_offset = 0x0c,
606 .name = "cio-das1401/12", /* cio-das1400_series.pdf */
607 .ai = das16_ai_rinsn,
610 .ai_pg = das16_pg_1601,
612 .di = das16_di_rbits,
613 .do_ = das16_do_wbits,
615 .i8254_offset = 0x0c,
619 .name = "cio-das1402/12", /* cio-das1400_series.pdf */
620 .ai = das16_ai_rinsn,
623 .ai_pg = das16_pg_1602,
625 .di = das16_di_rbits,
626 .do_ = das16_do_wbits,
628 .i8254_offset = 0x0c,
632 .name = "cio-das1402/16", /* cio-das1400_series.pdf */
633 .ai = das16_ai_rinsn,
636 .ai_pg = das16_pg_1602,
638 .di = das16_di_rbits,
639 .do_ = das16_do_wbits,
641 .i8254_offset = 0x0c,
645 .name = "cio-das1601/12", /* cio-das160x-1x.pdf */
646 .ai = das16_ai_rinsn,
649 .ai_pg = das16_pg_1601,
650 .ao = das16_ao_winsn,
652 .di = das16_di_rbits,
653 .do_ = das16_do_wbits,
654 .i8255_offset = 0x400,
655 .i8254_offset = 0x0c,
659 .name = "cio-das1602/12", /* cio-das160x-1x.pdf */
660 .ai = das16_ai_rinsn,
663 .ai_pg = das16_pg_1602,
664 .ao = das16_ao_winsn,
666 .di = das16_di_rbits,
667 .do_ = das16_do_wbits,
668 .i8255_offset = 0x400,
669 .i8254_offset = 0x0c,
673 .name = "cio-das1602/16", /* cio-das160x-1x.pdf */
674 .ai = das16_ai_rinsn,
677 .ai_pg = das16_pg_1602,
678 .ao = das16_ao_winsn,
680 .di = das16_di_rbits,
681 .do_ = das16_do_wbits,
682 .i8255_offset = 0x400,
683 .i8254_offset = 0x0c,
687 .name = "cio-das16/330", /* ? */
688 .ai = das16_ai_rinsn,
691 .ai_pg = das16_pg_16jr,
693 .di = das16_di_rbits,
694 .do_ = das16_do_wbits,
696 .i8254_offset = 0x0c,
701 .name = "das16/330i", /* ? */
704 .name = "das16/jr/ctr5", /* ? */
707 .name = "cio-das16/m1/16", /* cio-das16_m1_16.pdf, this board is a bit quirky, no dma */
712 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it);
713 static int das16_detach(struct comedi_device *dev);
714 static struct comedi_driver driver_das16 = {
715 .driver_name = "das16",
716 .module = THIS_MODULE,
717 .attach = das16_attach,
718 .detach = das16_detach,
719 .board_name = &das16_boards[0].name,
720 .num_names = ARRAY_SIZE(das16_boards),
721 .offset = sizeof(das16_boards[0]),
724 #define DAS16_TIMEOUT 1000
726 /* Period for timer interrupt in jiffies. It's a function
727 * to deal with possibility of dynamic HZ patches */
728 static inline int timer_period(void)
733 struct das16_private_struct {
734 unsigned int ai_unipolar; /* unipolar flag */
735 unsigned int ai_singleended; /* single ended flag */
736 unsigned int clockbase; /* master clock speed in ns */
737 volatile unsigned int control_state; /* dma, interrupt and trigger control bits */
738 volatile unsigned long adc_byte_count; /* number of bytes remaining */
739 unsigned int divisor1; /* divisor dividing master clock to get conversion frequency */
740 unsigned int divisor2; /* divisor dividing master clock to get conversion frequency */
741 unsigned int dma_chan; /* dma channel */
742 uint16_t *dma_buffer[2];
743 dma_addr_t dma_buffer_addr[2];
744 unsigned int current_buffer;
745 volatile unsigned int dma_transfer_size; /* target number of bytes to transfer per dma shot */
746 /* user-defined analog input and output ranges defined from config options */
747 struct comedi_lrange *user_ai_range_table;
748 struct comedi_lrange *user_ao_range_table;
750 struct timer_list timer; /* for timed interrupt */
751 volatile short timer_running;
752 volatile short timer_mode; /* true if using timer mode */
754 #define devpriv ((struct das16_private_struct *)(dev->private))
755 #define thisboard ((struct das16_board *)(dev->board_ptr))
757 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
758 struct comedi_cmd *cmd)
761 int gain, start_chan, i;
764 /* make sure triggers are valid */
765 tmp = cmd->start_src;
766 cmd->start_src &= TRIG_NOW;
767 if (!cmd->start_src || tmp != cmd->start_src)
770 tmp = cmd->scan_begin_src;
772 /* if board supports burst mode */
773 if (thisboard->size > 0x400)
774 mask |= TRIG_TIMER | TRIG_EXT;
775 cmd->scan_begin_src &= mask;
776 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
779 tmp = cmd->convert_src;
780 mask = TRIG_TIMER | TRIG_EXT;
781 /* if board supports burst mode */
782 if (thisboard->size > 0x400)
784 cmd->convert_src &= mask;
785 if (!cmd->convert_src || tmp != cmd->convert_src)
788 tmp = cmd->scan_end_src;
789 cmd->scan_end_src &= TRIG_COUNT;
790 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
794 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
795 if (!cmd->stop_src || tmp != cmd->stop_src)
801 /* step 2: make sure trigger sources are unique and mutually compatible */
802 if (cmd->scan_begin_src != TRIG_TIMER &&
803 cmd->scan_begin_src != TRIG_EXT &&
804 cmd->scan_begin_src != TRIG_FOLLOW)
806 if (cmd->convert_src != TRIG_TIMER &&
807 cmd->convert_src != TRIG_EXT && cmd->convert_src != TRIG_NOW)
809 if (cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_COUNT)
812 /* make sure scan_begin_src and convert_src dont conflict */
813 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
815 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
821 /* step 3: make sure arguments are trivially compatible */
822 if (cmd->start_arg != 0) {
827 if (cmd->scan_begin_src == TRIG_FOLLOW) {
828 /* internal trigger */
829 if (cmd->scan_begin_arg != 0) {
830 cmd->scan_begin_arg = 0;
835 if (cmd->scan_end_arg != cmd->chanlist_len) {
836 cmd->scan_end_arg = cmd->chanlist_len;
839 /* check against maximum frequency */
840 if (cmd->scan_begin_src == TRIG_TIMER) {
841 if (cmd->scan_begin_arg <
842 thisboard->ai_speed * cmd->chanlist_len) {
843 cmd->scan_begin_arg =
844 thisboard->ai_speed * cmd->chanlist_len;
848 if (cmd->convert_src == TRIG_TIMER) {
849 if (cmd->convert_arg < thisboard->ai_speed) {
850 cmd->convert_arg = thisboard->ai_speed;
855 if (cmd->stop_src == TRIG_NONE) {
856 if (cmd->stop_arg != 0) {
864 /* step 4: fix up arguments */
865 if (cmd->scan_begin_src == TRIG_TIMER) {
866 unsigned int tmp = cmd->scan_begin_arg;
867 /* set divisors, correct timing arguments */
868 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
869 &(devpriv->divisor1),
870 &(devpriv->divisor2),
871 &(cmd->scan_begin_arg),
872 cmd->flags & TRIG_ROUND_MASK);
873 err += (tmp != cmd->scan_begin_arg);
875 if (cmd->convert_src == TRIG_TIMER) {
876 unsigned int tmp = cmd->convert_arg;
877 /* set divisors, correct timing arguments */
878 i8253_cascade_ns_to_timer_2div(devpriv->clockbase,
879 &(devpriv->divisor1),
880 &(devpriv->divisor2),
882 cmd->flags & TRIG_ROUND_MASK);
883 err += (tmp != cmd->convert_arg);
888 /* check channel/gain list against card's limitations */
890 gain = CR_RANGE(cmd->chanlist[0]);
891 start_chan = CR_CHAN(cmd->chanlist[0]);
892 for (i = 1; i < cmd->chanlist_len; i++) {
893 if (CR_CHAN(cmd->chanlist[i]) !=
894 (start_chan + i) % s->n_chan) {
896 "entries in chanlist must be consecutive channels, counting upwards\n");
899 if (CR_RANGE(cmd->chanlist[i]) != gain) {
901 "entries in chanlist must all have the same gain\n");
912 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
914 struct comedi_async *async = s->async;
915 struct comedi_cmd *cmd = &async->cmd;
920 if (devpriv->dma_chan == 0 || (dev->irq == 0
921 && devpriv->timer_mode == 0)) {
923 "irq (or use of 'timer mode') dma required to execute comedi_cmd");
926 if (cmd->flags & TRIG_RT) {
928 "isa dma transfers cannot be performed with TRIG_RT, aborting");
932 devpriv->adc_byte_count =
933 cmd->stop_arg * cmd->chanlist_len * sizeof(uint16_t);
935 /* disable conversions for das1600 mode */
936 if (thisboard->size > 0x400) {
937 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV);
939 /* set scan limits */
940 byte = CR_CHAN(cmd->chanlist[0]);
941 byte |= CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]) << 4;
942 outb(byte, dev->iobase + DAS16_MUX);
944 /* set gain (this is also burst rate register but according to
945 * computer boards manual, burst rate does nothing, even on keithley cards) */
946 if (thisboard->ai_pg != das16_pg_none) {
947 range = CR_RANGE(cmd->chanlist[0]);
948 outb((das16_gainlists[thisboard->ai_pg])[range],
949 dev->iobase + DAS16_GAIN);
952 /* set counter mode and counts */
954 das16_set_pacer(dev, cmd->convert_arg,
955 cmd->flags & TRIG_ROUND_MASK);
956 DEBUG_PRINT("pacer period: %d ns\n", cmd->convert_arg);
958 /* enable counters */
960 /* Enable burst mode if appropriate. */
961 if (thisboard->size > 0x400) {
962 if (cmd->convert_src == TRIG_NOW) {
963 outb(DAS1600_BURST_VAL, dev->iobase + DAS1600_BURST);
964 /* set burst length */
965 byte |= BURST_LEN_BITS(cmd->chanlist_len - 1);
967 outb(0, dev->iobase + DAS1600_BURST);
970 outb(byte, dev->iobase + DAS16_PACER);
972 /* set up dma transfer */
973 flags = claim_dma_lock();
974 disable_dma(devpriv->dma_chan);
975 /* clear flip-flop to make sure 2-byte registers for
976 * count and address get set correctly */
977 clear_dma_ff(devpriv->dma_chan);
978 devpriv->current_buffer = 0;
979 set_dma_addr(devpriv->dma_chan,
980 devpriv->dma_buffer_addr[devpriv->current_buffer]);
981 /* set appropriate size of transfer */
982 devpriv->dma_transfer_size = das16_suggest_transfer_size(dev, *cmd);
983 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
984 enable_dma(devpriv->dma_chan);
985 release_dma_lock(flags);
987 /* set up interrupt */
988 if (devpriv->timer_mode) {
989 devpriv->timer_running = 1;
990 devpriv->timer.expires = jiffies + timer_period();
991 add_timer(&devpriv->timer);
992 devpriv->control_state &= ~DAS16_INTE;
994 /* clear interrupt bit */
995 outb(0x00, dev->iobase + DAS16_STATUS);
996 /* enable interrupts */
997 devpriv->control_state |= DAS16_INTE;
999 devpriv->control_state |= DMA_ENABLE;
1000 devpriv->control_state &= ~PACING_MASK;
1001 if (cmd->convert_src == TRIG_EXT)
1002 devpriv->control_state |= EXT_PACER;
1004 devpriv->control_state |= INT_PACER;
1005 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1007 /* Enable conversions if using das1600 mode */
1008 if (thisboard->size > 0x400) {
1009 outb(0, dev->iobase + DAS1600_CONV);
1015 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1017 unsigned long flags;
1019 spin_lock_irqsave(&dev->spinlock, flags);
1020 /* disable interrupts, dma and pacer clocked conversions */
1021 devpriv->control_state &= ~DAS16_INTE & ~PACING_MASK & ~DMA_ENABLE;
1022 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1023 if (devpriv->dma_chan)
1024 disable_dma(devpriv->dma_chan);
1026 /* disable SW timer */
1027 if (devpriv->timer_mode && devpriv->timer_running) {
1028 devpriv->timer_running = 0;
1029 del_timer(&devpriv->timer);
1032 /* disable burst mode */
1033 if (thisboard->size > 0x400) {
1034 outb(0, dev->iobase + DAS1600_BURST);
1037 spin_unlock_irqrestore(&dev->spinlock, flags);
1042 static void das16_reset(struct comedi_device *dev)
1044 outb(0, dev->iobase + DAS16_STATUS);
1045 outb(0, dev->iobase + DAS16_CONTROL);
1046 outb(0, dev->iobase + DAS16_PACER);
1047 outb(0, dev->iobase + DAS16_CNTR_CONTROL);
1050 static int das16_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1051 struct comedi_insn *insn, unsigned int *data)
1058 /* disable interrupts and pacing */
1059 devpriv->control_state &= ~DAS16_INTE & ~DMA_ENABLE & ~PACING_MASK;
1060 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1062 /* set multiplexer */
1063 chan = CR_CHAN(insn->chanspec);
1064 chan |= CR_CHAN(insn->chanspec) << 4;
1065 outb(chan, dev->iobase + DAS16_MUX);
1068 if (thisboard->ai_pg != das16_pg_none) {
1069 range = CR_RANGE(insn->chanspec);
1070 outb((das16_gainlists[thisboard->ai_pg])[range],
1071 dev->iobase + DAS16_GAIN);
1074 for (n = 0; n < insn->n; n++) {
1075 /* trigger conversion */
1076 outb_p(0, dev->iobase + DAS16_TRIG);
1078 for (i = 0; i < DAS16_TIMEOUT; i++) {
1079 if (!(inb(dev->iobase + DAS16_STATUS) & BUSY))
1082 if (i == DAS16_TIMEOUT) {
1083 printk("das16: timeout\n");
1086 msb = inb(dev->iobase + DAS16_AI_MSB);
1087 lsb = inb(dev->iobase + DAS16_AI_LSB);
1088 if (thisboard->ai_nbits == 12) {
1089 data[n] = ((lsb >> 4) & 0xf) | (msb << 4);
1091 data[n] = lsb | (msb << 8);
1098 static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
1099 struct comedi_insn *insn, unsigned int *data)
1103 bits = inb(dev->iobase + DAS16_DIO) & 0xf;
1110 static int das16_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
1111 struct comedi_insn *insn, unsigned int *data)
1115 /* only set bits that have been masked */
1118 /* zero bits that have been masked */
1120 /* set masked bits */
1121 wbits |= data[0] & data[1];
1125 outb(s->state, dev->iobase + DAS16_DIO);
1130 static int das16_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1131 struct comedi_insn *insn, unsigned int *data)
1137 chan = CR_CHAN(insn->chanspec);
1139 for (i = 0; i < insn->n; i++) {
1140 if (thisboard->ao_nbits == 12) {
1141 lsb = (data[i] << 4) & 0xff;
1142 msb = (data[i] >> 4) & 0xff;
1144 lsb = data[i] & 0xff;
1145 msb = (data[i] >> 8) & 0xff;
1147 outb(lsb, dev->iobase + DAS16_AO_LSB(chan));
1148 outb(msb, dev->iobase + DAS16_AO_MSB(chan));
1154 static irqreturn_t das16_dma_interrupt(int irq, void *d)
1157 struct comedi_device *dev = d;
1159 status = inb(dev->iobase + DAS16_STATUS);
1161 if ((status & DAS16_INT) == 0) {
1162 DEBUG_PRINT("spurious interrupt\n");
1166 /* clear interrupt */
1167 outb(0x00, dev->iobase + DAS16_STATUS);
1168 das16_interrupt(dev);
1172 static void das16_timer_interrupt(unsigned long arg)
1174 struct comedi_device *dev = (struct comedi_device *)arg;
1176 das16_interrupt(dev);
1178 if (devpriv->timer_running)
1179 mod_timer(&devpriv->timer, jiffies + timer_period());
1182 /* the pc104-das16jr (at least) has problems if the dma
1183 transfer is interrupted in the middle of transferring
1184 a 16 bit sample, so this function takes care to get
1185 an even transfer count after disabling dma
1188 static int disable_dma_on_even(struct comedi_device *dev)
1192 static const int disable_limit = 100;
1193 static const int enable_timeout = 100;
1194 disable_dma(devpriv->dma_chan);
1195 residue = get_dma_residue(devpriv->dma_chan);
1196 for (i = 0; i < disable_limit && (residue % 2); ++i) {
1198 enable_dma(devpriv->dma_chan);
1199 for (j = 0; j < enable_timeout; ++j) {
1202 new_residue = get_dma_residue(devpriv->dma_chan);
1203 if (new_residue != residue)
1206 disable_dma(devpriv->dma_chan);
1207 residue = get_dma_residue(devpriv->dma_chan);
1209 if (i == disable_limit) {
1211 "failed to get an even dma transfer, could be trouble.");
1216 static void das16_interrupt(struct comedi_device *dev)
1218 unsigned long dma_flags, spin_flags;
1219 struct comedi_subdevice *s = dev->read_subdev;
1220 struct comedi_async *async;
1221 struct comedi_cmd *cmd;
1222 int num_bytes, residue;
1225 if (dev->attached == 0) {
1226 comedi_error(dev, "premature interrupt");
1229 /* initialize async here to make sure it is not NULL */
1233 if (devpriv->dma_chan == 0) {
1234 comedi_error(dev, "interrupt with no dma channel?");
1238 spin_lock_irqsave(&dev->spinlock, spin_flags);
1239 if ((devpriv->control_state & DMA_ENABLE) == 0) {
1240 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
1241 DEBUG_PRINT("interrupt while dma disabled?\n");
1245 dma_flags = claim_dma_lock();
1246 clear_dma_ff(devpriv->dma_chan);
1247 residue = disable_dma_on_even(dev);
1249 /* figure out how many points to read */
1250 if (residue > devpriv->dma_transfer_size) {
1251 comedi_error(dev, "residue > transfer size!\n");
1252 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1255 num_bytes = devpriv->dma_transfer_size - residue;
1257 if (cmd->stop_src == TRIG_COUNT && num_bytes >= devpriv->adc_byte_count) {
1258 num_bytes = devpriv->adc_byte_count;
1259 async->events |= COMEDI_CB_EOA;
1262 buffer_index = devpriv->current_buffer;
1263 devpriv->current_buffer = (devpriv->current_buffer + 1) % 2;
1264 devpriv->adc_byte_count -= num_bytes;
1266 /* figure out how many bytes for next transfer */
1267 if (cmd->stop_src == TRIG_COUNT && devpriv->timer_mode == 0 &&
1268 devpriv->dma_transfer_size > devpriv->adc_byte_count)
1269 devpriv->dma_transfer_size = devpriv->adc_byte_count;
1272 if ((async->events & COMEDI_CB_EOA) == 0) {
1273 set_dma_addr(devpriv->dma_chan,
1274 devpriv->dma_buffer_addr[devpriv->current_buffer]);
1275 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
1276 enable_dma(devpriv->dma_chan);
1277 /* reenable conversions for das1600 mode, (stupid hardware) */
1278 if (thisboard->size > 0x400 && devpriv->timer_mode == 0) {
1279 outb(0x00, dev->iobase + DAS1600_CONV);
1282 release_dma_lock(dma_flags);
1284 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
1286 cfc_write_array_to_buffer(s,
1287 devpriv->dma_buffer[buffer_index], num_bytes);
1289 cfc_handle_events(dev, s);
1292 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
1295 i8253_cascade_ns_to_timer_2div(devpriv->clockbase, &(devpriv->divisor1),
1296 &(devpriv->divisor2), &ns,
1297 rounding_flags & TRIG_ROUND_MASK);
1299 /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
1300 i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 1, devpriv->divisor1, 2);
1301 i8254_load(dev->iobase + DAS16_CNTR0_DATA, 0, 2, devpriv->divisor2, 2);
1306 static void reg_dump(struct comedi_device *dev)
1308 DEBUG_PRINT("********DAS1600 REGISTER DUMP********\n");
1309 DEBUG_PRINT("DAS16_MUX: %x\n", inb(dev->iobase + DAS16_MUX));
1310 DEBUG_PRINT("DAS16_DIO: %x\n", inb(dev->iobase + DAS16_DIO));
1311 DEBUG_PRINT("DAS16_STATUS: %x\n", inb(dev->iobase + DAS16_STATUS));
1312 DEBUG_PRINT("DAS16_CONTROL: %x\n", inb(dev->iobase + DAS16_CONTROL));
1313 DEBUG_PRINT("DAS16_PACER: %x\n", inb(dev->iobase + DAS16_PACER));
1314 DEBUG_PRINT("DAS16_GAIN: %x\n", inb(dev->iobase + DAS16_GAIN));
1315 DEBUG_PRINT("DAS16_CNTR_CONTROL: %x\n",
1316 inb(dev->iobase + DAS16_CNTR_CONTROL));
1317 DEBUG_PRINT("DAS1600_CONV: %x\n", inb(dev->iobase + DAS1600_CONV));
1318 DEBUG_PRINT("DAS1600_BURST: %x\n", inb(dev->iobase + DAS1600_BURST));
1319 DEBUG_PRINT("DAS1600_ENABLE: %x\n", inb(dev->iobase + DAS1600_ENABLE));
1320 DEBUG_PRINT("DAS1600_STATUS_B: %x\n",
1321 inb(dev->iobase + DAS1600_STATUS_B));
1324 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
1329 /* status is available on all boards */
1331 status = inb(dev->iobase + DAS16_STATUS);
1333 if ((status & UNIPOLAR)) {
1334 devpriv->ai_unipolar = 1;
1336 devpriv->ai_unipolar = 0;
1339 if ((status & DAS16_MUXBIT)) {
1340 devpriv->ai_singleended = 1;
1342 devpriv->ai_singleended = 0;
1345 /* diobits indicates boards */
1347 diobits = inb(dev->iobase + DAS16_DIO) & 0xf0;
1349 printk(" id bits are 0x%02x\n", diobits);
1350 if (thisboard->id != diobits) {
1351 printk(" requested board's id bits are 0x%x (ignore)\n",
1358 static int das1600_mode_detect(struct comedi_device *dev)
1362 status = inb(dev->iobase + DAS1600_STATUS_B);
1364 if (status & DAS1600_CLK_10MHZ) {
1365 devpriv->clockbase = 100;
1366 printk(" 10MHz pacer clock\n");
1368 devpriv->clockbase = 1000;
1369 printk(" 1MHz pacer clock\n");
1383 * 3 Clock speed (in MHz)
1386 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1388 struct comedi_subdevice *s;
1391 unsigned long iobase;
1392 unsigned int dma_chan;
1394 unsigned long flags;
1395 struct comedi_krange *user_ai_range, *user_ao_range;
1397 iobase = it->options[0];
1399 irq = it->options[1];
1400 timer_mode = it->options[8];
1402 /* always use time_mode since using irq can drop samples while
1403 * waiting for dma done interrupt (due to hardware limitations) */
1409 printk("comedi%d: das16:", dev->minor);
1411 /* check that clock setting is valid */
1412 if (it->options[3]) {
1413 if (it->options[3] != 0 &&
1414 it->options[3] != 1 && it->options[3] != 10) {
1416 ("\n Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
1421 ret = alloc_private(dev, sizeof(struct das16_private_struct));
1425 if (thisboard->size < 0x400) {
1426 printk(" 0x%04lx-0x%04lx\n", iobase, iobase + thisboard->size);
1427 if (!request_region(iobase, thisboard->size, "das16")) {
1428 printk(" I/O port conflict\n");
1432 printk(" 0x%04lx-0x%04lx 0x%04lx-0x%04lx\n",
1433 iobase, iobase + 0x0f,
1435 iobase + 0x400 + (thisboard->size & 0x3ff));
1436 if (!request_region(iobase, 0x10, "das16")) {
1437 printk(" I/O port conflict: 0x%04lx-0x%04lx\n",
1438 iobase, iobase + 0x0f);
1441 if (!request_region(iobase + 0x400, thisboard->size & 0x3ff,
1443 release_region(iobase, 0x10);
1444 printk(" I/O port conflict: 0x%04lx-0x%04lx\n",
1446 iobase + 0x400 + (thisboard->size & 0x3ff));
1451 dev->iobase = iobase;
1453 /* probe id bits to make sure they are consistent */
1454 if (das16_probe(dev, it)) {
1455 printk(" id bits do not match selected board, aborting\n");
1458 dev->board_name = thisboard->name;
1460 /* get master clock speed */
1461 if (thisboard->size < 0x400) {
1463 devpriv->clockbase = 1000 / it->options[3];
1465 devpriv->clockbase = 1000; /* 1 MHz default */
1467 das1600_mode_detect(dev);
1470 /* now for the irq */
1471 if (irq > 1 && irq < 8) {
1472 ret = request_irq(irq, das16_dma_interrupt, 0, "das16", dev);
1477 printk(" ( irq = %u )", irq);
1478 } else if (irq == 0) {
1479 printk(" ( no irq )");
1481 printk(" invalid irq\n");
1485 /* initialize dma */
1486 dma_chan = it->options[2];
1487 if (dma_chan == 1 || dma_chan == 3) {
1488 /* allocate dma buffers */
1490 for (i = 0; i < 2; i++) {
1491 devpriv->dma_buffer[i] = pci_alloc_consistent(NULL,
1496 if (devpriv->dma_buffer[i] == NULL)
1499 if (request_dma(dma_chan, "das16")) {
1500 printk(" failed to allocate dma channel %i\n",
1504 devpriv->dma_chan = dma_chan;
1505 flags = claim_dma_lock();
1506 disable_dma(devpriv->dma_chan);
1507 set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
1508 release_dma_lock(flags);
1509 printk(" ( dma = %u)\n", dma_chan);
1510 } else if (dma_chan == 0) {
1511 printk(" ( no dma )\n");
1513 printk(" invalid dma channel\n");
1517 /* get any user-defined input range */
1518 if (thisboard->ai_pg == das16_pg_none &&
1519 (it->options[4] || it->options[5])) {
1520 /* allocate single-range range table */
1521 devpriv->user_ai_range_table =
1522 kmalloc(sizeof(struct comedi_lrange) +
1523 sizeof(struct comedi_krange), GFP_KERNEL);
1524 /* initialize ai range */
1525 devpriv->user_ai_range_table->length = 1;
1526 user_ai_range = devpriv->user_ai_range_table->range;
1527 user_ai_range->min = it->options[4];
1528 user_ai_range->max = it->options[5];
1529 user_ai_range->flags = UNIT_volt;
1531 /* get any user-defined output range */
1532 if (it->options[6] || it->options[7]) {
1533 /* allocate single-range range table */
1534 devpriv->user_ao_range_table =
1535 kmalloc(sizeof(struct comedi_lrange) +
1536 sizeof(struct comedi_krange), GFP_KERNEL);
1537 /* initialize ao range */
1538 devpriv->user_ao_range_table->length = 1;
1539 user_ao_range = devpriv->user_ao_range_table->range;
1540 user_ao_range->min = it->options[6];
1541 user_ao_range->max = it->options[7];
1542 user_ao_range->flags = UNIT_volt;
1546 init_timer(&(devpriv->timer));
1547 devpriv->timer.function = das16_timer_interrupt;
1548 devpriv->timer.data = (unsigned long)dev;
1550 devpriv->timer_mode = timer_mode ? 1 : 0;
1552 ret = alloc_subdevices(dev, 5);
1556 s = dev->subdevices + 0;
1557 dev->read_subdev = s;
1559 if (thisboard->ai) {
1560 s->type = COMEDI_SUBD_AI;
1561 s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
1562 if (devpriv->ai_singleended) {
1564 s->len_chanlist = 16;
1565 s->subdev_flags |= SDF_GROUND;
1568 s->len_chanlist = 8;
1569 s->subdev_flags |= SDF_DIFF;
1571 s->maxdata = (1 << thisboard->ai_nbits) - 1;
1572 if (devpriv->user_ai_range_table) { /* user defined ai range */
1573 s->range_table = devpriv->user_ai_range_table;
1574 } else if (devpriv->ai_unipolar) {
1575 s->range_table = das16_ai_uni_lranges[thisboard->ai_pg];
1577 s->range_table = das16_ai_bip_lranges[thisboard->ai_pg];
1579 s->insn_read = thisboard->ai;
1580 s->do_cmdtest = das16_cmd_test;
1581 s->do_cmd = das16_cmd_exec;
1582 s->cancel = das16_cancel;
1583 s->munge = das16_ai_munge;
1585 s->type = COMEDI_SUBD_UNUSED;
1588 s = dev->subdevices + 1;
1590 if (thisboard->ao) {
1591 s->type = COMEDI_SUBD_AO;
1592 s->subdev_flags = SDF_WRITABLE;
1594 s->maxdata = (1 << thisboard->ao_nbits) - 1;
1595 if (devpriv->user_ao_range_table) { /* user defined ao range */
1596 s->range_table = devpriv->user_ao_range_table;
1598 s->range_table = &range_unknown;
1600 s->insn_write = thisboard->ao;
1602 s->type = COMEDI_SUBD_UNUSED;
1605 s = dev->subdevices + 2;
1607 if (thisboard->di) {
1608 s->type = COMEDI_SUBD_DI;
1609 s->subdev_flags = SDF_READABLE;
1612 s->range_table = &range_digital;
1613 s->insn_bits = thisboard->di;
1615 s->type = COMEDI_SUBD_UNUSED;
1618 s = dev->subdevices + 3;
1620 if (thisboard->do_) {
1621 s->type = COMEDI_SUBD_DO;
1622 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1625 s->range_table = &range_digital;
1626 s->insn_bits = thisboard->do_;
1627 /* initialize digital output lines */
1628 outb(s->state, dev->iobase + DAS16_DIO);
1630 s->type = COMEDI_SUBD_UNUSED;
1633 s = dev->subdevices + 4;
1635 if (thisboard->i8255_offset != 0) {
1636 subdev_8255_init(dev, s, NULL, (dev->iobase +
1637 thisboard->i8255_offset));
1639 s->type = COMEDI_SUBD_UNUSED;
1643 /* set the interrupt level */
1644 devpriv->control_state = DAS16_IRQ(dev->irq);
1645 outb(devpriv->control_state, dev->iobase + DAS16_CONTROL);
1647 /* turn on das1600 mode if available */
1648 if (thisboard->size > 0x400) {
1649 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE);
1650 outb(0, dev->iobase + DAS1600_CONV);
1651 outb(0, dev->iobase + DAS1600_BURST);
1657 static int das16_detach(struct comedi_device *dev)
1659 printk("comedi%d: das16: remove\n", dev->minor);
1663 if (dev->subdevices)
1664 subdev_8255_cleanup(dev, dev->subdevices + 4);
1668 for (i = 0; i < 2; i++) {
1669 if (devpriv->dma_buffer[i])
1670 pci_free_consistent(NULL, DAS16_DMA_SIZE,
1671 devpriv->dma_buffer[i],
1673 dma_buffer_addr[i]);
1675 if (devpriv->dma_chan)
1676 free_dma(devpriv->dma_chan);
1677 if (devpriv->user_ai_range_table)
1678 kfree(devpriv->user_ai_range_table);
1679 if (devpriv->user_ao_range_table)
1680 kfree(devpriv->user_ao_range_table);
1684 free_irq(dev->irq, dev);
1687 if (thisboard->size < 0x400) {
1688 release_region(dev->iobase, thisboard->size);
1690 release_region(dev->iobase, 0x10);
1691 release_region(dev->iobase + 0x400,
1692 thisboard->size & 0x3ff);
1699 COMEDI_INITCLEANUP(driver_das16);
1701 /* utility function that suggests a dma transfer size in bytes */
1702 static unsigned int das16_suggest_transfer_size(struct comedi_device *dev,
1703 struct comedi_cmd cmd)
1708 /* if we are using timer interrupt, we don't care how long it
1709 * will take to complete transfer since it will be interrupted
1710 * by timer interrupt */
1711 if (devpriv->timer_mode)
1712 return DAS16_DMA_SIZE;
1714 /* otherwise, we are relying on dma terminal count interrupt,
1715 * so pick a reasonable size */
1716 if (cmd.convert_src == TRIG_TIMER)
1717 freq = 1000000000 / cmd.convert_arg;
1718 else if (cmd.scan_begin_src == TRIG_TIMER)
1719 freq = (1000000000 / cmd.scan_begin_arg) * cmd.chanlist_len;
1720 /* return some default value */
1724 if (cmd.flags & TRIG_WAKE_EOS) {
1725 size = sample_size * cmd.chanlist_len;
1727 /* make buffer fill in no more than 1/3 second */
1728 size = (freq / 3) * sample_size;
1731 /* set a minimum and maximum size allowed */
1732 if (size > DAS16_DMA_SIZE)
1733 size = DAS16_DMA_SIZE - DAS16_DMA_SIZE % sample_size;
1734 else if (size < sample_size)
1737 if (cmd.stop_src == TRIG_COUNT && size > devpriv->adc_byte_count)
1738 size = devpriv->adc_byte_count;
1743 static void das16_ai_munge(struct comedi_device *dev,
1744 struct comedi_subdevice *s, void *array,
1745 unsigned int num_bytes,
1746 unsigned int start_chan_index)
1748 unsigned int i, num_samples = num_bytes / sizeof(short);
1749 short *data = array;
1751 for (i = 0; i < num_samples; i++) {
1752 data[i] = le16_to_cpu(data[i]);
1753 if (thisboard->ai_nbits == 12) {
1754 data[i] = (data[i] >> 4) & 0xfff;