1 /*======================================================================
3 comedi/drivers/quatech_daqp_cs.c
5 Quatech DAQP PCMCIA data capture cards COMEDI client driver
6 Copyright (C) 2000, 2003 Brent Baccala <baccala@freesoft.org>
7 The DAQP interface code in this file is released into the public domain.
9 COMEDI - Linux Control and Measurement Device Interface
10 Copyright (C) 1998 David A. Schleef <ds@schleef.org>
11 http://www.comedi.org/
13 quatech_daqp_cs.c 1.10
15 Documentation for the DAQP PCMCIA cards can be found on Quatech's site:
17 ftp://ftp.quatech.com/Manuals/daqp-208.pdf
19 This manual is for both the DAQP-208 and the DAQP-308.
26 - ground ref or differential
27 - single-shot and timed both supported
28 - D/A conversion, single-shot
33 - any kind of triggering - external or D/A channel 1
34 - the card's optional expansion board
35 - the card's timer (for anything other than A/D conversion)
36 - D/A update modes other than immediate (i.e, timed)
37 - fancier timing modes
38 - setting card's FIFO buffer thresholds to anything but default
40 ======================================================================*/
43 Driver: quatech_daqp_cs
44 Description: Quatech DAQP PCMCIA data capture cards
45 Author: Brent Baccala <baccala@freesoft.org>
47 Devices: [Quatech] DAQP-208 (daqp), DAQP-308
50 #include "../comedidev.h"
51 #include <linux/semaphore.h>
53 #include <pcmcia/cistpl.h>
54 #include <pcmcia/cisreg.h>
55 #include <pcmcia/ds.h>
57 #include <linux/completion.h>
59 /* Maximum number of separate DAQP devices we'll allow */
63 struct pcmcia_device
*link
;
68 enum { semaphore
, buffer
} interrupt_mode
;
70 struct completion eos
;
72 struct comedi_device
*dev
;
73 struct comedi_subdevice
*s
;
77 /* A list of "instances" of the device. */
79 static struct local_info_t
*dev_table
[MAX_DEV
] = { NULL
, /* ... */ };
81 /* The DAQP communicates with the system through a 16 byte I/O window. */
83 #define DAQP_FIFO_SIZE 4096
86 #define DAQP_SCANLIST 1
87 #define DAQP_CONTROL 2
89 #define DAQP_DIGITAL_IO 3
90 #define DAQP_PACER_LOW 4
91 #define DAQP_PACER_MID 5
92 #define DAQP_PACER_HIGH 6
93 #define DAQP_COMMAND 7
98 #define DAQP_SCANLIST_DIFFERENTIAL 0x4000
99 #define DAQP_SCANLIST_GAIN(x) ((x)<<12)
100 #define DAQP_SCANLIST_CHANNEL(x) ((x)<<8)
101 #define DAQP_SCANLIST_START 0x0080
102 #define DAQP_SCANLIST_EXT_GAIN(x) ((x)<<4)
103 #define DAQP_SCANLIST_EXT_CHANNEL(x) (x)
105 #define DAQP_CONTROL_PACER_100kHz 0xc0
106 #define DAQP_CONTROL_PACER_1MHz 0x80
107 #define DAQP_CONTROL_PACER_5MHz 0x40
108 #define DAQP_CONTROL_PACER_EXTERNAL 0x00
109 #define DAQP_CONTORL_EXPANSION 0x20
110 #define DAQP_CONTROL_EOS_INT_ENABLE 0x10
111 #define DAQP_CONTROL_FIFO_INT_ENABLE 0x08
112 #define DAQP_CONTROL_TRIGGER_ONESHOT 0x00
113 #define DAQP_CONTROL_TRIGGER_CONTINUOUS 0x04
114 #define DAQP_CONTROL_TRIGGER_INTERNAL 0x00
115 #define DAQP_CONTROL_TRIGGER_EXTERNAL 0x02
116 #define DAQP_CONTROL_TRIGGER_RISING 0x00
117 #define DAQP_CONTROL_TRIGGER_FALLING 0x01
119 #define DAQP_STATUS_IDLE 0x80
120 #define DAQP_STATUS_RUNNING 0x40
121 #define DAQP_STATUS_EVENTS 0x38
122 #define DAQP_STATUS_DATA_LOST 0x20
123 #define DAQP_STATUS_END_OF_SCAN 0x10
124 #define DAQP_STATUS_FIFO_THRESHOLD 0x08
125 #define DAQP_STATUS_FIFO_FULL 0x04
126 #define DAQP_STATUS_FIFO_NEARFULL 0x02
127 #define DAQP_STATUS_FIFO_EMPTY 0x01
129 #define DAQP_COMMAND_ARM 0x80
130 #define DAQP_COMMAND_RSTF 0x40
131 #define DAQP_COMMAND_RSTQ 0x20
132 #define DAQP_COMMAND_STOP 0x10
133 #define DAQP_COMMAND_LATCH 0x08
134 #define DAQP_COMMAND_100kHz 0x00
135 #define DAQP_COMMAND_50kHz 0x02
136 #define DAQP_COMMAND_25kHz 0x04
137 #define DAQP_COMMAND_FIFO_DATA 0x01
138 #define DAQP_COMMAND_FIFO_PROGRAM 0x00
140 #define DAQP_AUX_TRIGGER_TTL 0x00
141 #define DAQP_AUX_TRIGGER_ANALOG 0x80
142 #define DAQP_AUX_TRIGGER_PRETRIGGER 0x40
143 #define DAQP_AUX_TIMER_INT_ENABLE 0x20
144 #define DAQP_AUX_TIMER_RELOAD 0x00
145 #define DAQP_AUX_TIMER_PAUSE 0x08
146 #define DAQP_AUX_TIMER_GO 0x10
147 #define DAQP_AUX_TIMER_GO_EXTERNAL 0x18
148 #define DAQP_AUX_TIMER_EXTERNAL_SRC 0x04
149 #define DAQP_AUX_TIMER_INTERNAL_SRC 0x00
150 #define DAQP_AUX_DA_DIRECT 0x00
151 #define DAQP_AUX_DA_OVERFLOW 0x01
152 #define DAQP_AUX_DA_EXTERNAL 0x02
153 #define DAQP_AUX_DA_PACER 0x03
155 #define DAQP_AUX_RUNNING 0x80
156 #define DAQP_AUX_TRIGGERED 0x40
157 #define DAQP_AUX_DA_BUFFER 0x20
158 #define DAQP_AUX_TIMER_OVERFLOW 0x10
159 #define DAQP_AUX_CONVERSION 0x08
160 #define DAQP_AUX_DATA_LOST 0x04
161 #define DAQP_AUX_FIFO_NEARFULL 0x02
162 #define DAQP_AUX_FIFO_EMPTY 0x01
164 /* These range structures tell COMEDI how the sample values map to
165 * voltages. The A/D converter has four .ranges = +/- 10V through
166 * +/- 1.25V, and the D/A converter has only .one = +/- 5V.
169 static const struct comedi_lrange range_daqp_ai
= { 4, {
177 static const struct comedi_lrange range_daqp_ao
= { 1, {BIP_RANGE(5)} };
179 /*====================================================================*/
181 /* comedi interface code */
183 static int daqp_attach(struct comedi_device
*dev
, struct comedi_devconfig
*it
);
184 static int daqp_detach(struct comedi_device
*dev
);
185 static struct comedi_driver driver_daqp
= {
186 .driver_name
= "quatech_daqp_cs",
187 .module
= THIS_MODULE
,
188 .attach
= daqp_attach
,
189 .detach
= daqp_detach
,
194 static void daqp_dump(struct comedi_device
*dev
)
196 printk(KERN_INFO
"DAQP: status %02x; aux status %02x\n",
197 inb(dev
->iobase
+ DAQP_STATUS
), inb(dev
->iobase
+ DAQP_AUX
));
200 static void hex_dump(char *str
, void *ptr
, int len
)
202 unsigned char *cptr
= ptr
;
207 for (i
= 0; i
< len
; i
++) {
209 printk("\n%p:", cptr
);
211 printk(" %02x", *(cptr
++));
218 /* Cancel a running acquisition */
220 static int daqp_ai_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
222 struct local_info_t
*local
= (struct local_info_t
*)s
->private;
228 outb(DAQP_COMMAND_STOP
, dev
->iobase
+ DAQP_COMMAND
);
230 /* flush any linguring data in FIFO - superfluous here */
231 /* outb(DAQP_COMMAND_RSTF, dev->iobase+DAQP_COMMAND); */
233 local
->interrupt_mode
= semaphore
;
240 * Operates in one of two modes. If local->interrupt_mode is
241 * 'semaphore', just signal the local->eos completion and return
242 * (one-shot mode). Otherwise (continuous mode), read data in from
243 * the card, transfer it to the buffer provided by the higher-level
244 * comedi kernel module, and signal various comedi callback routines,
245 * which run pretty quick.
247 static enum irqreturn
daqp_interrupt(int irq
, void *dev_id
)
249 struct local_info_t
*local
= (struct local_info_t
*)dev_id
;
250 struct comedi_device
*dev
;
251 struct comedi_subdevice
*s
;
252 int loop_limit
= 10000;
257 "daqp_interrupt(): irq %d for unknown device.\n", irq
);
263 printk(KERN_WARNING
"daqp_interrupt(): NULL comedi_device.\n");
267 if (!dev
->attached
) {
269 "daqp_interrupt(): struct comedi_device not yet attached.\n");
276 "daqp_interrupt(): NULL comedi_subdevice.\n");
280 if ((struct local_info_t
*)s
->private != local
) {
282 "daqp_interrupt(): invalid comedi_subdevice.\n");
286 switch (local
->interrupt_mode
) {
290 complete(&local
->eos
);
295 while (!((status
= inb(dev
->iobase
+ DAQP_STATUS
))
296 & DAQP_STATUS_FIFO_EMPTY
)) {
300 if (status
& DAQP_STATUS_DATA_LOST
) {
302 COMEDI_CB_EOA
| COMEDI_CB_OVERFLOW
;
303 printk("daqp: data lost\n");
304 daqp_ai_cancel(dev
, s
);
308 data
= inb(dev
->iobase
+ DAQP_FIFO
);
309 data
|= inb(dev
->iobase
+ DAQP_FIFO
) << 8;
312 comedi_buf_put(s
->async
, data
);
314 /* If there's a limit, decrement it
315 * and stop conversion if zero
318 if (local
->count
> 0) {
320 if (local
->count
== 0) {
321 daqp_ai_cancel(dev
, s
);
322 s
->async
->events
|= COMEDI_CB_EOA
;
327 if ((loop_limit
--) <= 0)
331 if (loop_limit
<= 0) {
333 "loop_limit reached in daqp_interrupt()\n");
334 daqp_ai_cancel(dev
, s
);
335 s
->async
->events
|= COMEDI_CB_EOA
| COMEDI_CB_ERROR
;
338 s
->async
->events
|= COMEDI_CB_BLOCK
;
340 comedi_event(dev
, s
);
345 /* One-shot analog data acquisition routine */
347 static int daqp_ai_insn_read(struct comedi_device
*dev
,
348 struct comedi_subdevice
*s
,
349 struct comedi_insn
*insn
, unsigned int *data
)
351 struct local_info_t
*local
= (struct local_info_t
*)s
->private;
360 /* Stop any running conversion */
361 daqp_ai_cancel(dev
, s
);
363 outb(0, dev
->iobase
+ DAQP_AUX
);
365 /* Reset scan list queue */
366 outb(DAQP_COMMAND_RSTQ
, dev
->iobase
+ DAQP_COMMAND
);
368 /* Program one scan list entry */
370 v
= DAQP_SCANLIST_CHANNEL(CR_CHAN(insn
->chanspec
))
371 | DAQP_SCANLIST_GAIN(CR_RANGE(insn
->chanspec
));
373 if (CR_AREF(insn
->chanspec
) == AREF_DIFF
)
374 v
|= DAQP_SCANLIST_DIFFERENTIAL
;
377 v
|= DAQP_SCANLIST_START
;
379 outb(v
& 0xff, dev
->iobase
+ DAQP_SCANLIST
);
380 outb(v
>> 8, dev
->iobase
+ DAQP_SCANLIST
);
382 /* Reset data FIFO (see page 28 of DAQP User's Manual) */
384 outb(DAQP_COMMAND_RSTF
, dev
->iobase
+ DAQP_COMMAND
);
388 v
= DAQP_CONTROL_TRIGGER_ONESHOT
| DAQP_CONTROL_TRIGGER_INTERNAL
389 | DAQP_CONTROL_PACER_100kHz
| DAQP_CONTROL_EOS_INT_ENABLE
;
391 outb(v
, dev
->iobase
+ DAQP_CONTROL
);
393 /* Reset any pending interrupts (my card has a tendancy to require
394 * require multiple reads on the status register to achieve this)
398 && (inb(dev
->iobase
+ DAQP_STATUS
) & DAQP_STATUS_EVENTS
)) ;
400 printk("daqp: couldn't clear interrupts in status register\n");
404 init_completion(&local
->eos
);
405 local
->interrupt_mode
= semaphore
;
409 for (i
= 0; i
< insn
->n
; i
++) {
411 /* Start conversion */
412 outb(DAQP_COMMAND_ARM
| DAQP_COMMAND_FIFO_DATA
,
413 dev
->iobase
+ DAQP_COMMAND
);
415 /* Wait for interrupt service routine to unblock completion */
416 /* Maybe could use a timeout here, but it's interruptible */
417 if (wait_for_completion_interruptible(&local
->eos
))
420 data
[i
] = inb(dev
->iobase
+ DAQP_FIFO
);
421 data
[i
] |= inb(dev
->iobase
+ DAQP_FIFO
) << 8;
428 /* This function converts ns nanoseconds to a counter value suitable
429 * for programming the device. We always use the DAQP's 5 MHz clock,
430 * which with its 24-bit counter, allows values up to 84 seconds.
431 * Also, the function adjusts ns so that it cooresponds to the actual
432 * time that the device will use.
435 static int daqp_ns_to_timer(unsigned int *ns
, int round
)
445 /* cmdtest tests a particular command to see if it is valid.
446 * Using the cmdtest ioctl, a user can create a valid cmd
447 * and then have it executed by the cmd ioctl.
449 * cmdtest returns 1,2,3,4 or 0, depending on which tests
450 * the command passes.
453 static int daqp_ai_cmdtest(struct comedi_device
*dev
,
454 struct comedi_subdevice
*s
, struct comedi_cmd
*cmd
)
459 /* step 1: make sure trigger sources are trivially valid */
461 tmp
= cmd
->start_src
;
462 cmd
->start_src
&= TRIG_NOW
;
463 if (!cmd
->start_src
|| tmp
!= cmd
->start_src
)
466 tmp
= cmd
->scan_begin_src
;
467 cmd
->scan_begin_src
&= TRIG_TIMER
| TRIG_FOLLOW
;
468 if (!cmd
->scan_begin_src
|| tmp
!= cmd
->scan_begin_src
)
471 tmp
= cmd
->convert_src
;
472 cmd
->convert_src
&= TRIG_TIMER
| TRIG_NOW
;
473 if (!cmd
->convert_src
|| tmp
!= cmd
->convert_src
)
476 tmp
= cmd
->scan_end_src
;
477 cmd
->scan_end_src
&= TRIG_COUNT
;
478 if (!cmd
->scan_end_src
|| tmp
!= cmd
->scan_end_src
)
482 cmd
->stop_src
&= TRIG_COUNT
| TRIG_NONE
;
483 if (!cmd
->stop_src
|| tmp
!= cmd
->stop_src
)
490 * step 2: make sure trigger sources
491 * are unique and mutually compatible
494 /* note that mutual compatibility is not an issue here */
495 if (cmd
->scan_begin_src
!= TRIG_TIMER
&&
496 cmd
->scan_begin_src
!= TRIG_FOLLOW
)
498 if (cmd
->convert_src
!= TRIG_NOW
&& cmd
->convert_src
!= TRIG_TIMER
)
500 if (cmd
->scan_begin_src
== TRIG_FOLLOW
&& cmd
->convert_src
== TRIG_NOW
)
502 if (cmd
->stop_src
!= TRIG_COUNT
&& cmd
->stop_src
!= TRIG_NONE
)
508 /* step 3: make sure arguments are trivially compatible */
510 if (cmd
->start_arg
!= 0) {
514 #define MAX_SPEED 10000 /* 100 kHz - in nanoseconds */
516 if (cmd
->scan_begin_src
== TRIG_TIMER
517 && cmd
->scan_begin_arg
< MAX_SPEED
) {
518 cmd
->scan_begin_arg
= MAX_SPEED
;
522 /* If both scan_begin and convert are both timer values, the only
523 * way that can make sense is if the scan time is the number of
524 * conversions times the convert time
527 if (cmd
->scan_begin_src
== TRIG_TIMER
&& cmd
->convert_src
== TRIG_TIMER
528 && cmd
->scan_begin_arg
!= cmd
->convert_arg
* cmd
->scan_end_arg
) {
532 if (cmd
->convert_src
== TRIG_TIMER
&& cmd
->convert_arg
< MAX_SPEED
) {
533 cmd
->convert_arg
= MAX_SPEED
;
537 if (cmd
->scan_end_arg
!= cmd
->chanlist_len
) {
538 cmd
->scan_end_arg
= cmd
->chanlist_len
;
541 if (cmd
->stop_src
== TRIG_COUNT
) {
542 if (cmd
->stop_arg
> 0x00ffffff) {
543 cmd
->stop_arg
= 0x00ffffff;
548 if (cmd
->stop_arg
!= 0) {
557 /* step 4: fix up any arguments */
559 if (cmd
->scan_begin_src
== TRIG_TIMER
) {
560 tmp
= cmd
->scan_begin_arg
;
561 daqp_ns_to_timer(&cmd
->scan_begin_arg
,
562 cmd
->flags
& TRIG_ROUND_MASK
);
563 if (tmp
!= cmd
->scan_begin_arg
)
567 if (cmd
->convert_src
== TRIG_TIMER
) {
568 tmp
= cmd
->convert_arg
;
569 daqp_ns_to_timer(&cmd
->convert_arg
,
570 cmd
->flags
& TRIG_ROUND_MASK
);
571 if (tmp
!= cmd
->convert_arg
)
581 static int daqp_ai_cmd(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
583 struct local_info_t
*local
= (struct local_info_t
*)s
->private;
584 struct comedi_cmd
*cmd
= &s
->async
->cmd
;
586 int scanlist_start_on_every_entry
;
596 /* Stop any running conversion */
597 daqp_ai_cancel(dev
, s
);
599 outb(0, dev
->iobase
+ DAQP_AUX
);
601 /* Reset scan list queue */
602 outb(DAQP_COMMAND_RSTQ
, dev
->iobase
+ DAQP_COMMAND
);
604 /* Program pacer clock
606 * There's two modes we can operate in. If convert_src is
607 * TRIG_TIMER, then convert_arg specifies the time between
608 * each conversion, so we program the pacer clock to that
609 * frequency and set the SCANLIST_START bit on every scanlist
610 * entry. Otherwise, convert_src is TRIG_NOW, which means
611 * we want the fastest possible conversions, scan_begin_src
612 * is TRIG_TIMER, and scan_begin_arg specifies the time between
613 * each scan, so we program the pacer clock to this frequency
614 * and only set the SCANLIST_START bit on the first entry.
617 if (cmd
->convert_src
== TRIG_TIMER
) {
618 counter
= daqp_ns_to_timer(&cmd
->convert_arg
,
619 cmd
->flags
& TRIG_ROUND_MASK
);
620 outb(counter
& 0xff, dev
->iobase
+ DAQP_PACER_LOW
);
621 outb((counter
>> 8) & 0xff, dev
->iobase
+ DAQP_PACER_MID
);
622 outb((counter
>> 16) & 0xff, dev
->iobase
+ DAQP_PACER_HIGH
);
623 scanlist_start_on_every_entry
= 1;
625 counter
= daqp_ns_to_timer(&cmd
->scan_begin_arg
,
626 cmd
->flags
& TRIG_ROUND_MASK
);
627 outb(counter
& 0xff, dev
->iobase
+ DAQP_PACER_LOW
);
628 outb((counter
>> 8) & 0xff, dev
->iobase
+ DAQP_PACER_MID
);
629 outb((counter
>> 16) & 0xff, dev
->iobase
+ DAQP_PACER_HIGH
);
630 scanlist_start_on_every_entry
= 0;
633 /* Program scan list */
635 for (i
= 0; i
< cmd
->chanlist_len
; i
++) {
637 int chanspec
= cmd
->chanlist
[i
];
639 /* Program one scan list entry */
641 v
= DAQP_SCANLIST_CHANNEL(CR_CHAN(chanspec
))
642 | DAQP_SCANLIST_GAIN(CR_RANGE(chanspec
));
644 if (CR_AREF(chanspec
) == AREF_DIFF
)
645 v
|= DAQP_SCANLIST_DIFFERENTIAL
;
647 if (i
== 0 || scanlist_start_on_every_entry
)
648 v
|= DAQP_SCANLIST_START
;
650 outb(v
& 0xff, dev
->iobase
+ DAQP_SCANLIST
);
651 outb(v
>> 8, dev
->iobase
+ DAQP_SCANLIST
);
654 /* Now it's time to program the FIFO threshold, basically the
655 * number of samples the card will buffer before it interrupts
658 * If we don't have a stop count, then use half the size of
659 * the FIFO (the manufacturer's recommendation). Consider
660 * that the FIFO can hold 2K samples (4K bytes). With the
661 * threshold set at half the FIFO size, we have a margin of
662 * error of 1024 samples. At the chip's maximum sample rate
663 * of 100,000 Hz, the CPU would have to delay interrupt
664 * service for a full 10 milliseconds in order to lose data
665 * here (as opposed to higher up in the kernel). I've never
666 * seen it happen. However, for slow sample rates it may
667 * buffer too much data and introduce too much delay for the
670 * If we have a stop count, then things get more interesting.
671 * If the stop count is less than the FIFO size (actually
672 * three-quarters of the FIFO size - see below), we just use
673 * the stop count itself as the threshold, the card interrupts
674 * us when that many samples have been taken, and we kill the
675 * acquisition at that point and are done. If the stop count
676 * is larger than that, then we divide it by 2 until it's less
677 * than three quarters of the FIFO size (we always leave the
678 * top quarter of the FIFO as protection against sluggish CPU
679 * interrupt response) and use that as the threshold. So, if
680 * the stop count is 4000 samples, we divide by two twice to
681 * get 1000 samples, use that as the threshold, take four
682 * interrupts to get our 4000 samples and are done.
684 * The algorithm could be more clever. For example, if 81000
685 * samples are requested, we could set the threshold to 1500
686 * samples and take 54 interrupts to get 81000. But 54 isn't
687 * a power of two, so this algorithm won't find that option.
688 * Instead, it'll set the threshold at 1266 and take 64
689 * interrupts to get 81024 samples, of which the last 24 will
690 * be discarded... but we won't get the last interrupt until
691 * they've been collected. To find the first option, the
692 * computer could look at the prime decomposition of the
693 * sample count (81000 = 3^4 * 5^3 * 2^3) and factor it into a
694 * threshold (1500 = 3 * 5^3 * 2^2) and an interrupt count (54
695 * = 3^3 * 2). Hmmm... a one-line while loop or prime
696 * decomposition of integers... I'll leave it the way it is.
698 * I'll also note a mini-race condition before ignoring it in
699 * the code. Let's say we're taking 4000 samples, as before.
700 * After 1000 samples, we get an interrupt. But before that
701 * interrupt is completely serviced, another sample is taken
702 * and loaded into the FIFO. Since the interrupt handler
703 * empties the FIFO before returning, it will read 1001 samples.
704 * If that happens four times, we'll end up taking 4004 samples,
705 * not 4000. The interrupt handler will discard the extra four
706 * samples (by halting the acquisition with four samples still
707 * in the FIFO), but we will have to wait for them.
709 * In short, this code works pretty well, but for either of
710 * the two reasons noted, might end up waiting for a few more
711 * samples than actually requested. Shouldn't make too much
715 /* Save away the number of conversions we should perform, and
716 * compute the FIFO threshold (in bytes, not samples - that's
717 * why we multiple local->count by 2 = sizeof(sample))
720 if (cmd
->stop_src
== TRIG_COUNT
) {
721 local
->count
= cmd
->stop_arg
* cmd
->scan_end_arg
;
722 threshold
= 2 * local
->count
;
723 while (threshold
> DAQP_FIFO_SIZE
* 3 / 4)
727 threshold
= DAQP_FIFO_SIZE
/ 2;
730 /* Reset data FIFO (see page 28 of DAQP User's Manual) */
732 outb(DAQP_COMMAND_RSTF
, dev
->iobase
+ DAQP_COMMAND
);
734 /* Set FIFO threshold. First two bytes are near-empty
735 * threshold, which is unused; next two bytes are near-full
736 * threshold. We computed the number of bytes we want in the
737 * FIFO when the interrupt is generated, what the card wants
738 * is actually the number of available bytes left in the FIFO
739 * when the interrupt is to happen.
742 outb(0x00, dev
->iobase
+ DAQP_FIFO
);
743 outb(0x00, dev
->iobase
+ DAQP_FIFO
);
745 outb((DAQP_FIFO_SIZE
- threshold
) & 0xff, dev
->iobase
+ DAQP_FIFO
);
746 outb((DAQP_FIFO_SIZE
- threshold
) >> 8, dev
->iobase
+ DAQP_FIFO
);
750 v
= DAQP_CONTROL_TRIGGER_CONTINUOUS
| DAQP_CONTROL_TRIGGER_INTERNAL
751 | DAQP_CONTROL_PACER_5MHz
| DAQP_CONTROL_FIFO_INT_ENABLE
;
753 outb(v
, dev
->iobase
+ DAQP_CONTROL
);
755 /* Reset any pending interrupts (my card has a tendancy to require
756 * require multiple reads on the status register to achieve this)
760 && (inb(dev
->iobase
+ DAQP_STATUS
) & DAQP_STATUS_EVENTS
)) ;
763 "daqp: couldn't clear interrupts in status register\n");
767 local
->interrupt_mode
= buffer
;
771 /* Start conversion */
772 outb(DAQP_COMMAND_ARM
| DAQP_COMMAND_FIFO_DATA
,
773 dev
->iobase
+ DAQP_COMMAND
);
778 /* Single-shot analog output routine */
780 static int daqp_ao_insn_write(struct comedi_device
*dev
,
781 struct comedi_subdevice
*s
,
782 struct comedi_insn
*insn
, unsigned int *data
)
784 struct local_info_t
*local
= (struct local_info_t
*)s
->private;
791 chan
= CR_CHAN(insn
->chanspec
);
794 d
^= 0x0800; /* Flip the sign */
797 /* Make sure D/A update mode is direct update */
798 outb(0, dev
->iobase
+ DAQP_AUX
);
800 outw(d
, dev
->iobase
+ DAQP_DA
);
805 /* Digital input routine */
807 static int daqp_di_insn_read(struct comedi_device
*dev
,
808 struct comedi_subdevice
*s
,
809 struct comedi_insn
*insn
, unsigned int *data
)
811 struct local_info_t
*local
= (struct local_info_t
*)s
->private;
816 data
[0] = inb(dev
->iobase
+ DAQP_DIGITAL_IO
);
821 /* Digital output routine */
823 static int daqp_do_insn_write(struct comedi_device
*dev
,
824 struct comedi_subdevice
*s
,
825 struct comedi_insn
*insn
, unsigned int *data
)
827 struct local_info_t
*local
= (struct local_info_t
*)s
->private;
832 outw(data
[0] & 0xf, dev
->iobase
+ DAQP_DIGITAL_IO
);
837 /* daqp_attach is called via comedi_config to attach a comedi device
838 * to a /dev/comedi*. Note that this is different from daqp_cs_attach()
839 * which is called by the pcmcia subsystem to attach the PCMCIA card
840 * when it is inserted.
843 static int daqp_attach(struct comedi_device
*dev
, struct comedi_devconfig
*it
)
846 struct local_info_t
*local
= dev_table
[it
->options
[0]];
847 struct comedi_subdevice
*s
;
849 if (it
->options
[0] < 0 || it
->options
[0] >= MAX_DEV
|| !local
) {
850 printk("comedi%d: No such daqp device %d\n",
851 dev
->minor
, it
->options
[0]);
855 /* Typically brittle code that I don't completely understand,
856 * but "it works on my card". The intent is to pull the model
857 * number of the card out the PCMCIA CIS and stash it away as
858 * the COMEDI board_name. Looks like the third field in
859 * CISTPL_VERS_1 (offset 2) holds what we're looking for. If
860 * it doesn't work, who cares, just leave it as "DAQP".
863 strcpy(local
->board_name
, "DAQP");
864 dev
->board_name
= local
->board_name
;
865 if (local
->link
->prod_id
[2]) {
866 if (strncmp(local
->link
->prod_id
[2], "DAQP", 4) == 0) {
867 strncpy(local
->board_name
, local
->link
->prod_id
[2],
868 sizeof(local
->board_name
));
872 dev
->iobase
= local
->link
->resource
[0]->start
;
874 ret
= alloc_subdevices(dev
, 4);
878 printk(KERN_INFO
"comedi%d: attaching daqp%d (io 0x%04lx)\n",
879 dev
->minor
, it
->options
[0], dev
->iobase
);
881 s
= dev
->subdevices
+ 0;
882 dev
->read_subdev
= s
;
884 s
->type
= COMEDI_SUBD_AI
;
885 s
->subdev_flags
= SDF_READABLE
| SDF_GROUND
| SDF_DIFF
| SDF_CMD_READ
;
887 s
->len_chanlist
= 2048;
889 s
->range_table
= &range_daqp_ai
;
890 s
->insn_read
= daqp_ai_insn_read
;
891 s
->do_cmdtest
= daqp_ai_cmdtest
;
892 s
->do_cmd
= daqp_ai_cmd
;
893 s
->cancel
= daqp_ai_cancel
;
895 s
= dev
->subdevices
+ 1;
896 dev
->write_subdev
= s
;
898 s
->type
= COMEDI_SUBD_AO
;
899 s
->subdev_flags
= SDF_WRITEABLE
;
903 s
->range_table
= &range_daqp_ao
;
904 s
->insn_write
= daqp_ao_insn_write
;
906 s
= dev
->subdevices
+ 2;
908 s
->type
= COMEDI_SUBD_DI
;
909 s
->subdev_flags
= SDF_READABLE
;
912 s
->insn_read
= daqp_di_insn_read
;
914 s
= dev
->subdevices
+ 3;
916 s
->type
= COMEDI_SUBD_DO
;
917 s
->subdev_flags
= SDF_WRITEABLE
;
920 s
->insn_write
= daqp_do_insn_write
;
925 /* daqp_detach (called from comedi_comdig) does nothing. If the PCMCIA
926 * card is removed, daqp_cs_detach() is called by the pcmcia subsystem.
929 static int daqp_detach(struct comedi_device
*dev
)
931 printk(KERN_INFO
"comedi%d: detaching daqp\n", dev
->minor
);
936 /*====================================================================
938 PCMCIA interface code
940 The rest of the code in this file is based on dummy_cs.c v1.24
941 from the Linux pcmcia_cs distribution v3.1.8 and is subject
942 to the following license agreement.
944 The remaining contents of this file are subject to the Mozilla Public
945 License Version 1.1 (the "License"); you may not use this file
946 except in compliance with the License. You may obtain a copy of
947 the License at http://www.mozilla.org/MPL/
949 Software distributed under the License is distributed on an "AS
950 IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
951 implied. See the License for the specific language governing
952 rights and limitations under the License.
954 The initial developer of the original code is David A. Hinds
955 <dhinds@pcmcia.sourceforge.org>. Portions created by David A. Hinds
956 are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
958 Alternatively, the contents of this file may be used under the
959 terms of the GNU Public License version 2 (the "GPL"), in which
960 case the provisions of the GPL are applicable instead of the
961 above. If you wish to allow the use of your version of this file
962 only under the terms of the GPL and not to allow others to use
963 your version of this file under the MPL, indicate your decision
964 by deleting the provisions above and replace them with the notice
965 and other provisions required by the GPL. If you do not delete
966 the provisions above, a recipient may use your version of this
967 file under either the MPL or the GPL.
969 ======================================================================*/
972 The event() function is this driver's Card Services event handler.
973 It will be called by Card Services when an appropriate card status
974 event is received. The config() and release() entry points are
975 used to configure or release a socket, in response to card
976 insertion and ejection events.
978 Kernel version 2.6.16 upwards uses suspend() and resume() functions
979 instead of an event() function.
982 static void daqp_cs_config(struct pcmcia_device
*link
);
983 static void daqp_cs_release(struct pcmcia_device
*link
);
984 static int daqp_cs_suspend(struct pcmcia_device
*p_dev
);
985 static int daqp_cs_resume(struct pcmcia_device
*p_dev
);
988 The attach() and detach() entry points are used to create and destroy
989 "instances" of the driver, where each instance represents everything
990 needed to manage one actual PCMCIA card.
993 static int daqp_cs_attach(struct pcmcia_device
*);
994 static void daqp_cs_detach(struct pcmcia_device
*);
996 /*======================================================================
998 daqp_cs_attach() creates an "instance" of the driver, allocating
999 local data structures for one device. The device is registered
1002 The dev_link structure is initialized, but we don't actually
1003 configure the card at this point -- we wait until we receive a
1004 card insertion event.
1006 ======================================================================*/
1008 static int daqp_cs_attach(struct pcmcia_device
*link
)
1010 struct local_info_t
*local
;
1013 dev_dbg(&link
->dev
, "daqp_cs_attach()\n");
1015 for (i
= 0; i
< MAX_DEV
; i
++)
1016 if (dev_table
[i
] == NULL
)
1019 printk(KERN_NOTICE
"daqp_cs: no devices available\n");
1023 /* Allocate space for private device-specific data */
1024 local
= kzalloc(sizeof(struct local_info_t
), GFP_KERNEL
);
1028 local
->table_index
= i
;
1029 dev_table
[i
] = local
;
1033 daqp_cs_config(link
);
1036 } /* daqp_cs_attach */
1038 /*======================================================================
1040 This deletes a driver "instance". The device is de-registered
1041 with Card Services. If it has been released, all local data
1042 structures are freed. Otherwise, the structures will be freed
1043 when the device is released.
1045 ======================================================================*/
1047 static void daqp_cs_detach(struct pcmcia_device
*link
)
1049 struct local_info_t
*dev
= link
->priv
;
1051 dev_dbg(&link
->dev
, "daqp_cs_detach\n");
1054 daqp_cs_release(link
);
1056 /* Unlink device structure, and free it */
1057 dev_table
[dev
->table_index
] = NULL
;
1060 } /* daqp_cs_detach */
1062 /*======================================================================
1064 daqp_cs_config() is scheduled to run after a CARD_INSERTION event
1065 is received, to configure the PCMCIA socket, and to make the
1066 device available to the system.
1068 ======================================================================*/
1071 static int daqp_pcmcia_config_loop(struct pcmcia_device
*p_dev
, void *priv_data
)
1073 if (p_dev
->config_index
== 0)
1076 return pcmcia_request_io(p_dev
);
1079 static void daqp_cs_config(struct pcmcia_device
*link
)
1083 dev_dbg(&link
->dev
, "daqp_cs_config\n");
1085 link
->config_flags
|= CONF_ENABLE_IRQ
| CONF_AUTO_SET_IO
;
1087 ret
= pcmcia_loop_config(link
, daqp_pcmcia_config_loop
, NULL
);
1089 dev_warn(&link
->dev
, "no configuration found\n");
1093 ret
= pcmcia_request_irq(link
, daqp_interrupt
);
1098 This actually configures the PCMCIA socket -- setting up
1099 the I/O windows and the interrupt mapping, and putting the
1100 card and host interface into "Memory and IO" mode.
1102 ret
= pcmcia_enable_device(link
);
1106 /* Finally, report what we've done */
1107 dev_info(&link
->dev
, "index 0x%02x", link
->config_index
);
1108 printk(", irq %u", link
->irq
);
1109 if (link
->resource
[0])
1110 printk(" & %pR", link
->resource
[0]);
1111 if (link
->resource
[1])
1112 printk(" & %pR", link
->resource
[1]);
1118 daqp_cs_release(link
);
1120 } /* daqp_cs_config */
1122 static void daqp_cs_release(struct pcmcia_device
*link
)
1124 dev_dbg(&link
->dev
, "daqp_cs_release\n");
1126 pcmcia_disable_device(link
);
1127 } /* daqp_cs_release */
1129 /*======================================================================
1131 The card status event handler. Mostly, this schedules other
1132 stuff to run after an event is received.
1134 When a CARD_REMOVAL event is received, we immediately set a
1135 private flag to block future accesses to this device. All the
1136 functions that actually access the device should check this flag
1137 to make sure the card is still present.
1139 ======================================================================*/
1141 static int daqp_cs_suspend(struct pcmcia_device
*link
)
1143 struct local_info_t
*local
= link
->priv
;
1145 /* Mark the device as stopped, to block IO until later */
1150 static int daqp_cs_resume(struct pcmcia_device
*link
)
1152 struct local_info_t
*local
= link
->priv
;
1159 /*====================================================================*/
1163 static struct pcmcia_device_id daqp_cs_id_table
[] = {
1164 PCMCIA_DEVICE_MANF_CARD(0x0137, 0x0027),
1168 MODULE_DEVICE_TABLE(pcmcia
, daqp_cs_id_table
);
1169 MODULE_AUTHOR("Brent Baccala <baccala@freesoft.org>");
1170 MODULE_DESCRIPTION("Comedi driver for Quatech DAQP PCMCIA data capture cards");
1171 MODULE_LICENSE("GPL");
1173 static struct pcmcia_driver daqp_cs_driver
= {
1174 .probe
= daqp_cs_attach
,
1175 .remove
= daqp_cs_detach
,
1176 .suspend
= daqp_cs_suspend
,
1177 .resume
= daqp_cs_resume
,
1178 .id_table
= daqp_cs_id_table
,
1179 .owner
= THIS_MODULE
,
1181 .name
= "quatech_daqp_cs",
1185 int __init
init_module(void)
1187 pcmcia_register_driver(&daqp_cs_driver
);
1188 comedi_driver_register(&driver_daqp
);
1192 void __exit
cleanup_module(void)
1194 comedi_driver_unregister(&driver_daqp
);
1195 pcmcia_unregister_driver(&daqp_cs_driver
);