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a69cc3a9
FMH		 1/*
2 comedi/drivers/das1800.c
3 Driver for Keitley das1700/das1800 series boards
4 Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
5
6 COMEDI - Linux Control and Measurement Device Interface
7 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23************************************************************************
24*/
25/*
26Driver: das1800
27Description: Keithley Metrabyte DAS1800 (& compatibles)
28Author: Frank Mori Hess <fmhess@users.sourceforge.net>
29Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st),
30 DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao),
31 DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da),
32 DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da),
33 DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st),
34 DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc),
35 DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st),
36 DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr),
37 DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc),
38 DAS-1802AO (das-1802ao)
39Status: works
40
41The waveform analog output on the 'ao' cards is not supported.
42If you need it, send me (Frank Hess) an email.
43
44Configuration options:
45 [0] - I/O port base address
46 [1] - IRQ (optional, required for timed or externally triggered conversions)
47 [2] - DMA0 (optional, requires irq)
48 [3] - DMA1 (optional, requires irq and dma0)
49*/
50/*
51
52This driver supports the following Keithley boards:
53
54das-1701st
55das-1701st-da
56das-1701ao
57das-1702st
58das-1702st-da
59das-1702hr
60das-1702hr-da
61das-1702ao
62das-1801st
63das-1801st-da
64das-1801hc
65das-1801ao
66das-1802st
67das-1802st-da
68das-1802hr
69das-1802hr-da
70das-1802hc
71das-1802ao
72
73Options:
74 [0] - base io address
75 [1] - irq (optional, required for timed or externally triggered conversions)
76 [2] - dma0 (optional, requires irq)
77 [3] - dma1 (optional, requires irq and dma0)
78
79irq can be omitted, although the cmd interface will not work without it.
80
81analog input cmd triggers supported:
82 start_src: TRIG_NOW | TRIG_EXT
83 scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT
84 scan_end_src: TRIG_COUNT
85 convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW)
86 stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE
87
88scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's
89'burst mode' which limits the valid conversion time to 64 microseconds
90(convert_arg <= 64000). This limitation does not apply if scan_begin_src
91is TRIG_FOLLOW.
92
93NOTES:
94Only the DAS-1801ST has been tested by me.
95Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
96
97TODO:
98 Make it automatically allocate irq and dma channels if they are not specified
99 Add support for analog out on 'ao' cards
100 read insn for analog out
101*/
102
103#include "../comedidev.h"
104
105#include <linux/ioport.h>
106#include <asm/dma.h>
107
108#include "8253.h"
109#include "comedi_fc.h"
110
a351ecf3
BP		 111/* misc. defines */
112#define DAS1800_SIZE 16 /* uses 16 io addresses */
113#define FIFO_SIZE 1024 /* 1024 sample fifo */
114#define TIMER_BASE 200 /* 5 Mhz master clock */
115#define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */
116#define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */
a69cc3a9
FMH		 117
118/* Registers for the das1800 */
119#define DAS1800_FIFO 0x0
120#define DAS1800_QRAM 0x0
121#define DAS1800_DAC 0x0
122#define DAS1800_SELECT 0x2
123#define ADC 0x0
124#define QRAM 0x1
125#define DAC(a) (0x2 + a)
126#define DAS1800_DIGITAL 0x3
127#define DAS1800_CONTROL_A 0x4
128#define FFEN 0x1
129#define CGEN 0x4
130#define CGSL 0x8
131#define TGEN 0x10
132#define TGSL 0x20
133#define ATEN 0x80
134#define DAS1800_CONTROL_B 0x5
135#define DMA_CH5 0x1
136#define DMA_CH6 0x2
137#define DMA_CH7 0x3
138#define DMA_CH5_CH6 0x5
139#define DMA_CH6_CH7 0x6
140#define DMA_CH7_CH5 0x7
a351ecf3 141#define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */
a69cc3a9
FMH		 142#define DMA_DUAL 0x4
143#define IRQ3 0x8
144#define IRQ5 0x10
145#define IRQ7 0x18
146#define IRQ10 0x28
147#define IRQ11 0x30
148#define IRQ15 0x38
149#define FIMD 0x40
150#define DAS1800_CONTROL_C 0X6
151#define IPCLK 0x1
152#define XPCLK 0x3
153#define BMDE 0x4
154#define CMEN 0x8
155#define UQEN 0x10
156#define SD 0x40
157#define UB 0x80
158#define DAS1800_STATUS 0x7
a351ecf3 159/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
a69cc3a9
FMH		 160#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
161#define INT 0x1
162#define DMATC 0x2
163#define CT0TC 0x8
164#define OVF 0x10
165#define FHF 0x20
166#define FNE 0x40
a351ecf3 167#define CVEN_MASK 0x40 /* masks CVEN on write */
a69cc3a9
FMH		 168#define CVEN 0x80
169#define DAS1800_BURST_LENGTH 0x8
170#define DAS1800_BURST_RATE 0x9
171#define DAS1800_QRAM_ADDRESS 0xa
172#define DAS1800_COUNTER 0xc
173
a351ecf3 174#define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */
a69cc3a9
FMH		 175
176enum {
177 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
178 das1702hr_da,
179 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
180 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
181};
182
0707bb04 183static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig * it);
71b5f4f1
BP		 184static int das1800_detach(struct comedi_device * dev);
185static int das1800_probe(struct comedi_device * dev);
34c43922 186static int das1800_cancel(struct comedi_device * dev, struct comedi_subdevice * s);
70265d24 187static irqreturn_t das1800_interrupt(int irq, void *d);
34c43922 188static int das1800_ai_poll(struct comedi_device * dev, struct comedi_subdevice * s);
71b5f4f1 189static void das1800_ai_handler(struct comedi_device * dev);
34c43922 190static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevice * s,
a69cc3a9 191 unsigned int status);
34c43922
BP		 192static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevice * s);
193static void das1800_flush_dma_channel(struct comedi_device * dev, struct comedi_subdevice * s,
a69cc3a9 194 unsigned int channel, uint16_t * buffer);
71b5f4f1 195static void das1800_handle_fifo_half_full(struct comedi_device * dev,
34c43922 196 struct comedi_subdevice * s);
71b5f4f1 197static void das1800_handle_fifo_not_empty(struct comedi_device * dev,
34c43922
BP		 198 struct comedi_subdevice * s);
199static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
ea6d0d4c 200 struct comedi_cmd * cmd);
34c43922
BP		 201static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s);
202static int das1800_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s,
90035c08 203 struct comedi_insn * insn, unsigned int * data);
34c43922 204static int das1800_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s,
90035c08 205 struct comedi_insn * insn, unsigned int * data);
34c43922 206static int das1800_di_rbits(struct comedi_device * dev, struct comedi_subdevice * s,
90035c08 207 struct comedi_insn * insn, unsigned int * data);
34c43922 208static int das1800_do_wbits(struct comedi_device * dev, struct comedi_subdevice * s,
90035c08 209 struct comedi_insn * insn, unsigned int * data);
a69cc3a9 210
71b5f4f1 211static int das1800_set_frequency(struct comedi_device * dev);
a69cc3a9 212static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
ea6d0d4c 213static unsigned int suggest_transfer_size(struct comedi_cmd * cmd);
a69cc3a9 214
a351ecf3 215/* analog input ranges */
9ced1de6 216static const struct comedi_lrange range_ai_das1801 = {
a69cc3a9
FMH		 217 8,
218 {
219 RANGE(-5, 5),
220 RANGE(-1, 1),
221 RANGE(-0.1, 0.1),
222 RANGE(-0.02, 0.02),
223 RANGE(0, 5),
224 RANGE(0, 1),
225 RANGE(0, 0.1),
226 RANGE(0, 0.02),
227 }
228};
229
9ced1de6 230static const struct comedi_lrange range_ai_das1802 = {
a69cc3a9
FMH		 231 8,
232 {
233 RANGE(-10, 10),
234 RANGE(-5, 5),
235 RANGE(-2.5, 2.5),
236 RANGE(-1.25, 1.25),
237 RANGE(0, 10),
238 RANGE(0, 5),
239 RANGE(0, 2.5),
240 RANGE(0, 1.25),
241 }
242};
243
ce422cf3 244struct das1800_board {
a69cc3a9
FMH		 245 const char *name;
246 int ai_speed; /* max conversion period in nanoseconds */
247 int resolution; /* bits of ai resolution */
248 int qram_len; /* length of card's channel / gain queue */
249 int common; /* supports AREF_COMMON flag */
250 int do_n_chan; /* number of digital output channels */
251 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
252 int ao_n_chan; /* number of analog out channels */
9ced1de6 253 const struct comedi_lrange *range_ai; /* available input ranges */
ce422cf3 254};
a69cc3a9
FMH		 255
256/* Warning: the maximum conversion speeds listed below are
257 * not always achievable depending on board setup (see
258 * user manual.)
259 */
ce422cf3 260static const struct das1800_board das1800_boards[] = {
a69cc3a9 261 {
68c3dbff
BP		 262 .name = "das-1701st",
263 .ai_speed = 6250,
264 .resolution = 12,
265 .qram_len = 256,
266 .common = 1,
267 .do_n_chan = 4,
268 .ao_ability = 0,
269 .ao_n_chan = 0,
270 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 271 },
272 {
68c3dbff
BP		 273 .name = "das-1701st-da",
274 .ai_speed = 6250,
275 .resolution = 12,
276 .qram_len = 256,
277 .common = 1,
278 .do_n_chan = 4,
279 .ao_ability = 1,
280 .ao_n_chan = 4,
281 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 282 },
283 {
68c3dbff
BP		 284 .name = "das-1702st",
285 .ai_speed = 6250,
286 .resolution = 12,
287 .qram_len = 256,
288 .common = 1,
289 .do_n_chan = 4,
290 .ao_ability = 0,
291 .ao_n_chan = 0,
292 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 293 },
294 {
68c3dbff
BP		 295 .name = "das-1702st-da",
296 .ai_speed = 6250,
297 .resolution = 12,
298 .qram_len = 256,
299 .common = 1,
300 .do_n_chan = 4,
301 .ao_ability = 1,
302 .ao_n_chan = 4,
303 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 304 },
305 {
68c3dbff
BP		 306 .name = "das-1702hr",
307 .ai_speed = 20000,
308 .resolution = 16,
309 .qram_len = 256,
310 .common = 1,
311 .do_n_chan = 4,
312 .ao_ability = 0,
313 .ao_n_chan = 0,
314 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 315 },
316 {
68c3dbff
BP		 317 .name = "das-1702hr-da",
318 .ai_speed = 20000,
319 .resolution = 16,
320 .qram_len = 256,
321 .common = 1,
322 .do_n_chan = 4,
323 .ao_ability = 1,
324 .ao_n_chan = 2,
325 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 326 },
327 {
68c3dbff
BP		 328 .name = "das-1701ao",
329 .ai_speed = 6250,
330 .resolution = 12,
331 .qram_len = 256,
332 .common = 1,
333 .do_n_chan = 4,
334 .ao_ability = 2,
335 .ao_n_chan = 2,
336 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 337 },
338 {
68c3dbff
BP		 339 .name = "das-1702ao",
340 .ai_speed = 6250,
341 .resolution = 12,
342 .qram_len = 256,
343 .common = 1,
344 .do_n_chan = 4,
345 .ao_ability = 2,
346 .ao_n_chan = 2,
347 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 348 },
349 {
68c3dbff
BP		 350 .name = "das-1801st",
351 .ai_speed = 3000,
352 .resolution = 12,
353 .qram_len = 256,
354 .common = 1,
355 .do_n_chan = 4,
356 .ao_ability = 0,
357 .ao_n_chan = 0,
358 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 359 },
360 {
68c3dbff
BP		 361 .name = "das-1801st-da",
362 .ai_speed = 3000,
363 .resolution = 12,
364 .qram_len = 256,
365 .common = 1,
366 .do_n_chan = 4,
367 .ao_ability = 0,
368 .ao_n_chan = 4,
369 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 370 },
371 {
68c3dbff
BP		 372 .name = "das-1802st",
373 .ai_speed = 3000,
374 .resolution = 12,
375 .qram_len = 256,
376 .common = 1,
377 .do_n_chan = 4,
378 .ao_ability = 0,
379 .ao_n_chan = 0,
380 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 381 },
382 {
68c3dbff
BP		 383 .name = "das-1802st-da",
384 .ai_speed = 3000,
385 .resolution = 12,
386 .qram_len = 256,
387 .common = 1,
388 .do_n_chan = 4,
389 .ao_ability = 1,
390 .ao_n_chan = 4,
391 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 392 },
393 {
68c3dbff
BP		 394 .name = "das-1802hr",
395 .ai_speed = 10000,
396 .resolution = 16,
397 .qram_len = 256,
398 .common = 1,
399 .do_n_chan = 4,
400 .ao_ability = 0,
401 .ao_n_chan = 0,
402 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 403 },
404 {
68c3dbff
BP		 405 .name = "das-1802hr-da",
406 .ai_speed = 10000,
407 .resolution = 16,
408 .qram_len = 256,
409 .common = 1,
410 .do_n_chan = 4,
411 .ao_ability = 1,
412 .ao_n_chan = 2,
413 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 414 },
415 {
68c3dbff
BP		 416 .name = "das-1801hc",
417 .ai_speed = 3000,
418 .resolution = 12,
419 .qram_len = 64,
420 .common = 0,
421 .do_n_chan = 8,
422 .ao_ability = 1,
423 .ao_n_chan = 2,
424 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 425 },
426 {
68c3dbff
BP		 427 .name = "das-1802hc",
428 .ai_speed = 3000,
429 .resolution = 12,
430 .qram_len = 64,
431 .common = 0,
432 .do_n_chan = 8,
433 .ao_ability = 1,
434 .ao_n_chan = 2,
435 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 436 },
437 {
68c3dbff
BP		 438 .name = "das-1801ao",
439 .ai_speed = 3000,
440 .resolution = 12,
441 .qram_len = 256,
442 .common = 1,
443 .do_n_chan = 4,
444 .ao_ability = 2,
445 .ao_n_chan = 2,
446 .range_ai = &range_ai_das1801,
a69cc3a9
FMH		 447 },
448 {
68c3dbff
BP		 449 .name = "das-1802ao",
450 .ai_speed = 3000,
451 .resolution = 12,
452 .qram_len = 256,
453 .common = 1,
454 .do_n_chan = 4,
455 .ao_ability = 2,
456 .ao_n_chan = 2,
457 .range_ai = &range_ai_das1802,
a69cc3a9
FMH		 458 },
459};
460
461/*
462 * Useful for shorthand access to the particular board structure
463 */
ce422cf3 464#define thisboard ((const struct das1800_board *)dev->board_ptr)
a69cc3a9 465
0c5a144d 466struct das1800_private {
a69cc3a9
FMH		 467 volatile unsigned int count; /* number of data points left to be taken */
468 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
469 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
470 int do_bits; /* digital output bits */
471 int irq_dma_bits; /* bits for control register b */
472 /* dma bits for control register b, stored so that dma can be
473 * turned on and off */
474 int dma_bits;
475 unsigned int dma0; /* dma channels used */
476 unsigned int dma1;
477 volatile unsigned int dma_current; /* dma channel currently in use */
478 uint16_t *ai_buf0; /* pointers to dma buffers */
479 uint16_t *ai_buf1;
480 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
481 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
482 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
483 short ao_update_bits; /* remembers the last write to the 'update' dac */
0c5a144d 484};
a69cc3a9 485
0c5a144d 486#define devpriv ((struct das1800_private *)dev->private)
a69cc3a9 487
a351ecf3 488/* analog out range for boards with basic analog out */
9ced1de6 489static const struct comedi_lrange range_ao_1 = {
a69cc3a9
FMH		 490 1,
491 {
492 RANGE(-10, 10),
493 }
494};
495
a351ecf3 496/* analog out range for 'ao' boards */
a69cc3a9 497/*
9ced1de6 498static const struct comedi_lrange range_ao_2 = {
a69cc3a9
FMH		 499 2,
500 {
501 RANGE(-10, 10),
502 RANGE(-5, 5),
503 }
504};
505*/
506
139dfbdf 507static struct comedi_driver driver_das1800 = {
68c3dbff
BP		 508 .driver_name = "das1800",
509 .module = THIS_MODULE,
510 .attach = das1800_attach,
511 .detach = das1800_detach,
512 .num_names = sizeof(das1800_boards) / sizeof(struct das1800_board),
513 .board_name = &das1800_boards[0].name,
514 .offset = sizeof(struct das1800_board),
a69cc3a9
FMH		 515};
516
517/*
518 * A convenient macro that defines init_module() and cleanup_module(),
519 * as necessary.
520 */
521COMEDI_INITCLEANUP(driver_das1800);
522
da91b269 523static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
a69cc3a9
FMH		 524 unsigned int dma1)
525{
526 unsigned long flags;
527
a351ecf3 528 /* need an irq to do dma */
a69cc3a9 529 if (dev->irq && dma0) {
a351ecf3 530 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
a69cc3a9 531 switch ((dma0 & 0x7) | (dma1 << 4)) {
a351ecf3 532 case 0x5: /* dma0 == 5 */
a69cc3a9
FMH		 533 devpriv->dma_bits |= DMA_CH5;
534 break;
a351ecf3 535 case 0x6: /* dma0 == 6 */
a69cc3a9
FMH		 536 devpriv->dma_bits |= DMA_CH6;
537 break;
a351ecf3 538 case 0x7: /* dma0 == 7 */
a69cc3a9
FMH		 539 devpriv->dma_bits |= DMA_CH7;
540 break;
a351ecf3 541 case 0x65: /* dma0 == 5, dma1 == 6 */
a69cc3a9
FMH		 542 devpriv->dma_bits |= DMA_CH5_CH6;
543 break;
a351ecf3 544 case 0x76: /* dma0 == 6, dma1 == 7 */
a69cc3a9
FMH		 545 devpriv->dma_bits |= DMA_CH6_CH7;
546 break;
a351ecf3 547 case 0x57: /* dma0 == 7, dma1 == 5 */
a69cc3a9
FMH		 548 devpriv->dma_bits |= DMA_CH7_CH5;
549 break;
550 default:
551 printk(" only supports dma channels 5 through 7\n"
552 " Dual dma only allows the following combinations:\n"
553 " dma 5,6 / 6,7 / or 7,5\n");
554 return -EINVAL;
555 break;
556 }
557 if (request_dma(dma0, driver_das1800.driver_name)) {
558 printk(" failed to allocate dma channel %i\n", dma0);
559 return -EINVAL;
560 }
561 devpriv->dma0 = dma0;
562 devpriv->dma_current = dma0;
563 if (dma1) {
564 if (request_dma(dma1, driver_das1800.driver_name)) {
565 printk(" failed to allocate dma channel %i\n",
566 dma1);
567 return -EINVAL;
568 }
569 devpriv->dma1 = dma1;
570 }
571 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
572 if (devpriv->ai_buf0 == NULL)
573 return -ENOMEM;
574 devpriv->dma_current_buf = devpriv->ai_buf0;
575 if (dma1) {
576 devpriv->ai_buf1 =
577 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
578 if (devpriv->ai_buf1 == NULL)
579 return -ENOMEM;
580 }
581 flags = claim_dma_lock();
582 disable_dma(devpriv->dma0);
583 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
584 if (dma1) {
585 disable_dma(devpriv->dma1);
586 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
587 }
588 release_dma_lock(flags);
589 }
590 return 0;
591}
592
da91b269 593static int das1800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
a69cc3a9 594{
34c43922 595 struct comedi_subdevice *s;
a69cc3a9
FMH		 596 unsigned long iobase = it->options[0];
597 unsigned int irq = it->options[1];
598 unsigned int dma0 = it->options[2];
599 unsigned int dma1 = it->options[3];
600 unsigned long iobase2;
601 int board;
602 int retval;
603
604 /* allocate and initialize dev->private */
0c5a144d 605 if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
a69cc3a9
FMH		 606 return -ENOMEM;
607
608 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
609 iobase);
610 if (irq) {
611 printk(", irq %u", irq);
612 if (dma0) {
613 printk(", dma %u", dma0);
614 if (dma1)
615 printk(" and %u", dma1);
616 }
617 }
618 printk("\n");
619
620 if (iobase == 0) {
621 printk(" io base address required\n");
622 return -EINVAL;
623 }
624
625 /* check if io addresses are available */
626 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
627 printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase, iobase + DAS1800_SIZE - 1);
628 return -EIO;
629 }
630 dev->iobase = iobase;
631
632 board = das1800_probe(dev);
633 if (board < 0) {
634 printk(" unable to determine board type\n");
635 return -ENODEV;
636 }
637
638 dev->board_ptr = das1800_boards + board;
639 dev->board_name = thisboard->name;
640
a351ecf3 641 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
a69cc3a9
FMH		 642 if (thisboard->ao_ability == 2) {
643 iobase2 = iobase + IOBASE2;
644 if (!request_region(iobase2, DAS1800_SIZE,
645 driver_das1800.driver_name)) {
646 printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase2, iobase2 + DAS1800_SIZE - 1);
647 return -EIO;
648 }
649 devpriv->iobase2 = iobase2;
650 }
651
652 /* grab our IRQ */
653 if (irq) {
654 if (comedi_request_irq(irq, das1800_interrupt, 0,
655 driver_das1800.driver_name, dev)) {
656 printk(" unable to allocate irq %u\n", irq);
657 return -EINVAL;
658 }
659 }
660 dev->irq = irq;
661
a351ecf3 662 /* set bits that tell card which irq to use */
a69cc3a9
FMH		 663 switch (irq) {
664 case 0:
665 break;
666 case 3:
667 devpriv->irq_dma_bits |= 0x8;
668 break;
669 case 5:
670 devpriv->irq_dma_bits |= 0x10;
671 break;
672 case 7:
673 devpriv->irq_dma_bits |= 0x18;
674 break;
675 case 10:
676 devpriv->irq_dma_bits |= 0x28;
677 break;
678 case 11:
679 devpriv->irq_dma_bits |= 0x30;
680 break;
681 case 15:
682 devpriv->irq_dma_bits |= 0x38;
683 break;
684 default:
685 printk(" irq out of range\n");
686 return -EINVAL;
687 break;
688 }
689
690 retval = das1800_init_dma(dev, dma0, dma1);
691 if (retval < 0)
692 return retval;
693
694 if (devpriv->ai_buf0 == NULL) {
695 devpriv->ai_buf0 =
696 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
697 if (devpriv->ai_buf0 == NULL)
698 return -ENOMEM;
699 }
700
701 if (alloc_subdevices(dev, 4) < 0)
702 return -ENOMEM;
703
704 /* analog input subdevice */
705 s = dev->subdevices + 0;
706 dev->read_subdev = s;
707 s->type = COMEDI_SUBD_AI;
708 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
709 if (thisboard->common)
710 s->subdev_flags |= SDF_COMMON;
711 s->n_chan = thisboard->qram_len;
712 s->len_chanlist = thisboard->qram_len;
713 s->maxdata = (1 << thisboard->resolution) - 1;
714 s->range_table = thisboard->range_ai;
715 s->do_cmd = das1800_ai_do_cmd;
716 s->do_cmdtest = das1800_ai_do_cmdtest;
717 s->insn_read = das1800_ai_rinsn;
718 s->poll = das1800_ai_poll;
719 s->cancel = das1800_cancel;
720
721 /* analog out */
722 s = dev->subdevices + 1;
723 if (thisboard->ao_ability == 1) {
724 s->type = COMEDI_SUBD_AO;
725 s->subdev_flags = SDF_WRITABLE;
726 s->n_chan = thisboard->ao_n_chan;
727 s->maxdata = (1 << thisboard->resolution) - 1;
728 s->range_table = &range_ao_1;
729 s->insn_write = das1800_ao_winsn;
730 } else {
731 s->type = COMEDI_SUBD_UNUSED;
732 }
733
734 /* di */
735 s = dev->subdevices + 2;
736 s->type = COMEDI_SUBD_DI;
737 s->subdev_flags = SDF_READABLE;
738 s->n_chan = 4;
739 s->maxdata = 1;
740 s->range_table = &range_digital;
741 s->insn_bits = das1800_di_rbits;
742
743 /* do */
744 s = dev->subdevices + 3;
745 s->type = COMEDI_SUBD_DO;
746 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
747 s->n_chan = thisboard->do_n_chan;
748 s->maxdata = 1;
749 s->range_table = &range_digital;
750 s->insn_bits = das1800_do_wbits;
751
752 das1800_cancel(dev, dev->read_subdev);
753
a351ecf3 754 /* initialize digital out channels */
a69cc3a9
FMH		 755 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
756
a351ecf3 757 /* initialize analog out channels */
a69cc3a9 758 if (thisboard->ao_ability == 1) {
a351ecf3 759 /* select 'update' dac channel for baseAddress + 0x0 */
a69cc3a9
FMH		 760 outb(DAC(thisboard->ao_n_chan - 1),
761 dev->iobase + DAS1800_SELECT);
762 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
763 }
764
765 return 0;
766};
767
da91b269 768static int das1800_detach(struct comedi_device *dev)
a69cc3a9
FMH		 769{
770 /* only free stuff if it has been allocated by _attach */
771 if (dev->iobase)
772 release_region(dev->iobase, DAS1800_SIZE);
773 if (dev->irq)
774 comedi_free_irq(dev->irq, dev);
775 if (dev->private) {
776 if (devpriv->iobase2)
777 release_region(devpriv->iobase2, DAS1800_SIZE);
778 if (devpriv->dma0)
779 free_dma(devpriv->dma0);
780 if (devpriv->dma1)
781 free_dma(devpriv->dma1);
782 if (devpriv->ai_buf0)
783 kfree(devpriv->ai_buf0);
784 if (devpriv->ai_buf1)
785 kfree(devpriv->ai_buf1);
786 }
787
788 printk("comedi%d: %s: remove\n", dev->minor,
789 driver_das1800.driver_name);
790
791 return 0;
792};
793
794/* probes and checks das-1800 series board type
795 */
da91b269 796static int das1800_probe(struct comedi_device *dev)
a69cc3a9
FMH		 797{
798 int id;
799 int board;
800
801 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
ce422cf3 802 board = ((struct das1800_board *) dev->board_ptr) - das1800_boards;
a69cc3a9
FMH		 803
804 switch (id) {
805 case 0x3:
806 if (board == das1801st_da || board == das1802st_da ||
807 board == das1701st_da || board == das1702st_da) {
808 printk(" Board model: %s\n",
809 das1800_boards[board].name);
810 return board;
811 }
812 printk(" Board model (probed, not recommended): das-1800st-da series\n");
813 return das1801st;
814 break;
815 case 0x4:
816 if (board == das1802hr_da || board == das1702hr_da) {
817 printk(" Board model: %s\n",
818 das1800_boards[board].name);
819 return board;
820 }
821 printk(" Board model (probed, not recommended): das-1802hr-da\n");
822 return das1802hr;
823 break;
824 case 0x5:
825 if (board == das1801ao || board == das1802ao ||
826 board == das1701ao || board == das1702ao) {
827 printk(" Board model: %s\n",
828 das1800_boards[board].name);
829 return board;
830 }
831 printk(" Board model (probed, not recommended): das-1800ao series\n");
832 return das1801ao;
833 break;
834 case 0x6:
835 if (board == das1802hr || board == das1702hr) {
836 printk(" Board model: %s\n",
837 das1800_boards[board].name);
838 return board;
839 }
840 printk(" Board model (probed, not recommended): das-1802hr\n");
841 return das1802hr;
842 break;
843 case 0x7:
844 if (board == das1801st || board == das1802st ||
845 board == das1701st || board == das1702st) {
846 printk(" Board model: %s\n",
847 das1800_boards[board].name);
848 return board;
849 }
850 printk(" Board model (probed, not recommended): das-1800st series\n");
851 return das1801st;
852 break;
853 case 0x8:
854 if (board == das1801hc || board == das1802hc) {
855 printk(" Board model: %s\n",
856 das1800_boards[board].name);
857 return board;
858 }
859 printk(" Board model (probed, not recommended): das-1800hc series\n");
860 return das1801hc;
861 break;
862 default:
863 printk(" Board model: probe returned 0x%x (unknown, please report)\n", id);
864 return board;
865 break;
866 }
867 return -1;
868}
869
da91b269 870static int das1800_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s)
a69cc3a9
FMH		 871{
872 unsigned long flags;
873
a351ecf3 874 /* prevent race with interrupt handler */
a69cc3a9
FMH		 875 comedi_spin_lock_irqsave(&dev->spinlock, flags);
876 das1800_ai_handler(dev);
877 comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
878
879 return s->async->buf_write_count - s->async->buf_read_count;
880}
881
70265d24 882static irqreturn_t das1800_interrupt(int irq, void *d)
a69cc3a9 883{
71b5f4f1 884 struct comedi_device *dev = d;
a69cc3a9
FMH		 885 unsigned int status;
886
887 if (dev->attached == 0) {
888 comedi_error(dev, "premature interrupt");
889 return IRQ_HANDLED;
890 }
891
892 /* Prevent race with das1800_ai_poll() on multi processor systems.
893 * Also protects indirect addressing in das1800_ai_handler */
894 spin_lock(&dev->spinlock);
895 status = inb(dev->iobase + DAS1800_STATUS);
896
897 /* if interrupt was not caused by das-1800 */
898 if (!(status & INT)) {
899 spin_unlock(&dev->spinlock);
900 return IRQ_NONE;
901 }
902 /* clear the interrupt status bit INT */
903 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
a351ecf3 904 /* handle interrupt */
a69cc3a9
FMH		 905 das1800_ai_handler(dev);
906
907 spin_unlock(&dev->spinlock);
908 return IRQ_HANDLED;
909}
910
a351ecf3 911/* the guts of the interrupt handler, that is shared with das1800_ai_poll */
da91b269 912static void das1800_ai_handler(struct comedi_device *dev)
a69cc3a9 913{
34c43922 914 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
d163679c 915 struct comedi_async *async = s->async;
ea6d0d4c 916 struct comedi_cmd *cmd = &async->cmd;
a69cc3a9
FMH		 917 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
918
919 async->events = 0;
a351ecf3 920 /* select adc for base address + 0 */
a69cc3a9 921 outb(ADC, dev->iobase + DAS1800_SELECT);
a351ecf3 922 /* dma buffer full */
a69cc3a9 923 if (devpriv->irq_dma_bits & DMA_ENABLED) {
a351ecf3 924 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
a69cc3a9 925 das1800_handle_dma(dev, s, status);
a351ecf3 926 } else if (status & FHF) { /* if fifo half full */
a69cc3a9 927 das1800_handle_fifo_half_full(dev, s);
a351ecf3 928 } else if (status & FNE) { /* if fifo not empty */
a69cc3a9
FMH		 929 das1800_handle_fifo_not_empty(dev, s);
930 }
931
932 async->events |= COMEDI_CB_BLOCK;
933 /* if the card's fifo has overflowed */
934 if (status & OVF) {
a351ecf3 935 /* clear OVF interrupt bit */
a69cc3a9
FMH		 936 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
937 comedi_error(dev, "DAS1800 FIFO overflow");
938 das1800_cancel(dev, s);
939 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
940 comedi_event(dev, s);
941 return;
942 }
a351ecf3 943 /* stop taking data if appropriate */
a69cc3a9
FMH		 944 /* stop_src TRIG_EXT */
945 if (status & CT0TC) {
a351ecf3 946 /* clear CT0TC interrupt bit */
a69cc3a9 947 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
a351ecf3 948 /* make sure we get all remaining data from board before quitting */
a69cc3a9
FMH		 949 if (devpriv->irq_dma_bits & DMA_ENABLED)
950 das1800_flush_dma(dev, s);
951 else
952 das1800_handle_fifo_not_empty(dev, s);
953 das1800_cancel(dev, s); /* disable hardware conversions */
954 async->events |= COMEDI_CB_EOA;
a351ecf3 955 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
a69cc3a9
FMH		 956 das1800_cancel(dev, s); /* disable hardware conversions */
957 async->events |= COMEDI_CB_EOA;
958 }
959
960 comedi_event(dev, s);
961
962 return;
963}
964
da91b269 965static void das1800_handle_dma(struct comedi_device *dev, struct comedi_subdevice *s,
a69cc3a9
FMH		 966 unsigned int status)
967{
968 unsigned long flags;
969 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
970
971 flags = claim_dma_lock();
972 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
973 devpriv->dma_current_buf);
a351ecf3 974 /* re-enable dma channel */
a69cc3a9
FMH		 975 set_dma_addr(devpriv->dma_current,
976 virt_to_bus(devpriv->dma_current_buf));
977 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
978 enable_dma(devpriv->dma_current);
979 release_dma_lock(flags);
980
981 if (status & DMATC) {
a351ecf3 982 /* clear DMATC interrupt bit */
a69cc3a9 983 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
a351ecf3 984 /* switch dma channels for next time, if appropriate */
a69cc3a9 985 if (dual_dma) {
a351ecf3 986 /* read data from the other channel next time */
a69cc3a9
FMH		 987 if (devpriv->dma_current == devpriv->dma0) {
988 devpriv->dma_current = devpriv->dma1;
989 devpriv->dma_current_buf = devpriv->ai_buf1;
990 } else {
991 devpriv->dma_current = devpriv->dma0;
992 devpriv->dma_current_buf = devpriv->ai_buf0;
993 }
994 }
995 }
996
997 return;
998}
999
da91b269 1000static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
a69cc3a9
FMH		 1001 uint16_t sample)
1002{
1003 sample += 1 << (thisboard->resolution - 1);
1004 return sample;
1005}
1006
da91b269 1007static void munge_data(struct comedi_device *dev, uint16_t *array,
a69cc3a9
FMH		 1008 unsigned int num_elements)
1009{
1010 unsigned int i;
1011 int unipolar;
1012
1013 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
1014 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1015
1016 /* convert to unsigned type if we are in a bipolar mode */
1017 if (!unipolar) {
1018 for (i = 0; i < num_elements; i++) {
1019 array[i] = munge_bipolar_sample(dev, array[i]);
1020 }
1021 }
1022}
1023
1024/* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1025 * Assumes dma lock is held */
da91b269
BP		 1026static void das1800_flush_dma_channel(struct comedi_device *dev, struct comedi_subdevice *s,
1027 unsigned int channel, uint16_t *buffer)
a69cc3a9
FMH		 1028{
1029 unsigned int num_bytes, num_samples;
ea6d0d4c 1030 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1031
1032 disable_dma(channel);
1033
1034 /* clear flip-flop to make sure 2-byte registers
1035 * get set correctly */
1036 clear_dma_ff(channel);
1037
a351ecf3 1038 /* figure out how many points to read */
a69cc3a9 1039 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
790c5541 1040 num_samples = num_bytes / sizeof(short);
a69cc3a9
FMH		 1041
1042 /* if we only need some of the points */
1043 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1044 num_samples = devpriv->count;
1045
1046 munge_data(dev, buffer, num_samples);
1047 cfc_write_array_to_buffer(s, buffer, num_bytes);
1048 if (s->async->cmd.stop_src == TRIG_COUNT)
1049 devpriv->count -= num_samples;
1050
1051 return;
1052}
1053
1054/* flushes remaining data from board when external trigger has stopped aquisition
1055 * and we are using dma transfers */
da91b269 1056static void das1800_flush_dma(struct comedi_device *dev, struct comedi_subdevice *s)
a69cc3a9
FMH		 1057{
1058 unsigned long flags;
1059 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1060
1061 flags = claim_dma_lock();
1062 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1063 devpriv->dma_current_buf);
1064
1065 if (dual_dma) {
a351ecf3 1066 /* switch to other channel and flush it */
a69cc3a9
FMH		 1067 if (devpriv->dma_current == devpriv->dma0) {
1068 devpriv->dma_current = devpriv->dma1;
1069 devpriv->dma_current_buf = devpriv->ai_buf1;
1070 } else {
1071 devpriv->dma_current = devpriv->dma0;
1072 devpriv->dma_current_buf = devpriv->ai_buf0;
1073 }
1074 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1075 devpriv->dma_current_buf);
1076 }
1077
1078 release_dma_lock(flags);
1079
a351ecf3 1080 /* get any remaining samples in fifo */
a69cc3a9
FMH		 1081 das1800_handle_fifo_not_empty(dev, s);
1082
1083 return;
1084}
1085
da91b269
BP		 1086static void das1800_handle_fifo_half_full(struct comedi_device *dev,
1087 struct comedi_subdevice *s)
a69cc3a9
FMH		 1088{
1089 int numPoints = 0; /* number of points to read */
ea6d0d4c 1090 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1091
1092 numPoints = FIFO_SIZE / 2;
1093 /* if we only need some of the points */
1094 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1095 numPoints = devpriv->count;
1096 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1097 munge_data(dev, devpriv->ai_buf0, numPoints);
1098 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
1099 numPoints * sizeof(devpriv->ai_buf0[0]));
1100 if (cmd->stop_src == TRIG_COUNT)
1101 devpriv->count -= numPoints;
1102 return;
1103}
1104
da91b269
BP		 1105static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
1106 struct comedi_subdevice *s)
a69cc3a9 1107{
790c5541 1108 short dpnt;
a69cc3a9 1109 int unipolar;
ea6d0d4c 1110 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1111
1112 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1113
1114 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1115 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1116 break;
1117 dpnt = inw(dev->iobase + DAS1800_FIFO);
1118 /* convert to unsigned type if we are in a bipolar mode */
1119 if (!unipolar) ;
1120 dpnt = munge_bipolar_sample(dev, dpnt);
1121 cfc_write_to_buffer(s, dpnt);
1122 if (cmd->stop_src == TRIG_COUNT)
1123 devpriv->count--;
1124 }
1125
1126 return;
1127}
1128
da91b269 1129static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
a69cc3a9
FMH		 1130{
1131 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
1132 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
1133 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
1134 if (devpriv->dma0)
1135 disable_dma(devpriv->dma0);
1136 if (devpriv->dma1)
1137 disable_dma(devpriv->dma1);
1138 return 0;
1139}
1140
1141/* test analog input cmd */
da91b269
BP		 1142static int das1800_ai_do_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
1143 struct comedi_cmd *cmd)
a69cc3a9
FMH		 1144{
1145 int err = 0;
1146 int tmp;
1147 unsigned int tmp_arg;
1148 int i;
1149 int unipolar;
1150
1151 /* step 1: make sure trigger sources are trivially valid */
1152
1153 tmp = cmd->start_src;
1154 cmd->start_src &= TRIG_NOW | TRIG_EXT;
1155 if (!cmd->start_src || tmp != cmd->start_src)
1156 err++;
1157
1158 tmp = cmd->scan_begin_src;
1159 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1160 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1161 err++;
1162
1163 tmp = cmd->convert_src;
1164 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1165 if (!cmd->convert_src || tmp != cmd->convert_src)
1166 err++;
1167
1168 tmp = cmd->scan_end_src;
1169 cmd->scan_end_src &= TRIG_COUNT;
1170 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1171 err++;
1172
1173 tmp = cmd->stop_src;
1174 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1175 if (!cmd->stop_src || tmp != cmd->stop_src)
1176 err++;
1177
1178 if (err)
1179 return 1;
1180
1181 /* step 2: make sure trigger sources are unique and mutually compatible */
1182
a351ecf3 1183 /* uniqueness check */
a69cc3a9
FMH		 1184 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1185 err++;
1186 if (cmd->scan_begin_src != TRIG_FOLLOW &&
1187 cmd->scan_begin_src != TRIG_TIMER &&
1188 cmd->scan_begin_src != TRIG_EXT)
1189 err++;
1190 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1191 err++;
1192 if (cmd->stop_src != TRIG_COUNT &&
1193 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
1194 err++;
a351ecf3 1195 /* compatibility check */
a69cc3a9
FMH		 1196 if (cmd->scan_begin_src != TRIG_FOLLOW &&
1197 cmd->convert_src != TRIG_TIMER)
1198 err++;
1199
1200 if (err)
1201 return 2;
1202
1203 /* step 3: make sure arguments are trivially compatible */
1204
1205 if (cmd->start_arg != 0) {
1206 cmd->start_arg = 0;
1207 err++;
1208 }
1209 if (cmd->convert_src == TRIG_TIMER) {
1210 if (cmd->convert_arg < thisboard->ai_speed) {
1211 cmd->convert_arg = thisboard->ai_speed;
1212 err++;
1213 }
1214 }
1215 if (!cmd->chanlist_len) {
1216 cmd->chanlist_len = 1;
1217 err++;
1218 }
1219 if (cmd->scan_end_arg != cmd->chanlist_len) {
1220 cmd->scan_end_arg = cmd->chanlist_len;
1221 err++;
1222 }
1223
1224 switch (cmd->stop_src) {
1225 case TRIG_COUNT:
1226 if (!cmd->stop_arg) {
1227 cmd->stop_arg = 1;
1228 err++;
1229 }
1230 break;
1231 case TRIG_NONE:
1232 if (cmd->stop_arg != 0) {
1233 cmd->stop_arg = 0;
1234 err++;
1235 }
1236 break;
1237 default:
1238 break;
1239 }
1240
1241 if (err)
1242 return 3;
1243
1244 /* step 4: fix up any arguments */
1245
1246 if (cmd->convert_src == TRIG_TIMER) {
a351ecf3 1247 /* if we are not in burst mode */
a69cc3a9
FMH		 1248 if (cmd->scan_begin_src == TRIG_FOLLOW) {
1249 tmp_arg = cmd->convert_arg;
1250 /* calculate counter values that give desired timing */
1251 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1252 &(devpriv->divisor1), &(devpriv->divisor2),
1253 &(cmd->convert_arg),
1254 cmd->flags & TRIG_ROUND_MASK);
1255 if (tmp_arg != cmd->convert_arg)
1256 err++;
1257 }
a351ecf3 1258 /* if we are in burst mode */
a69cc3a9 1259 else {
a351ecf3 1260 /* check that convert_arg is compatible */
a69cc3a9
FMH		 1261 tmp_arg = cmd->convert_arg;
1262 cmd->convert_arg =
1263 burst_convert_arg(cmd->convert_arg,
1264 cmd->flags & TRIG_ROUND_MASK);
1265 if (tmp_arg != cmd->convert_arg)
1266 err++;
1267
1268 if (cmd->scan_begin_src == TRIG_TIMER) {
a351ecf3 1269 /* if scans are timed faster than conversion rate allows */
a69cc3a9
FMH		 1270 if (cmd->convert_arg * cmd->chanlist_len >
1271 cmd->scan_begin_arg) {
1272 cmd->scan_begin_arg =
1273 cmd->convert_arg *
1274 cmd->chanlist_len;
1275 err++;
1276 }
1277 tmp_arg = cmd->scan_begin_arg;
1278 /* calculate counter values that give desired timing */
1279 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1280 &(devpriv->divisor1),
1281 &(devpriv->divisor2),
1282 &(cmd->scan_begin_arg),
1283 cmd->flags & TRIG_ROUND_MASK);
1284 if (tmp_arg != cmd->scan_begin_arg)
1285 err++;
1286 }
1287 }
1288 }
1289
1290 if (err)
1291 return 4;
1292
a351ecf3 1293 /* make sure user is not trying to mix unipolar and bipolar ranges */
a69cc3a9
FMH		 1294 if (cmd->chanlist) {
1295 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1296 for (i = 1; i < cmd->chanlist_len; i++) {
1297 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1298 comedi_error(dev,
1299 "unipolar and bipolar ranges cannot be mixed in the chanlist");
1300 err++;
1301 break;
1302 }
1303 }
1304 }
1305
1306 if (err)
1307 return 5;
1308
1309 return 0;
1310}
1311
1312/* analog input cmd interface */
1313
a351ecf3 1314/* first, some utility functions used in the main ai_do_cmd() */
a69cc3a9 1315
a351ecf3 1316/* returns appropriate bits for control register a, depending on command */
ea6d0d4c 1317static int control_a_bits(struct comedi_cmd cmd)
a69cc3a9
FMH		 1318{
1319 int control_a;
1320
a351ecf3 1321 control_a = FFEN; /* enable fifo */
a69cc3a9
FMH		 1322 if (cmd.stop_src == TRIG_EXT) {
1323 control_a |= ATEN;
1324 }
1325 switch (cmd.start_src) {
1326 case TRIG_EXT:
1327 control_a |= TGEN | CGSL;
1328 break;
1329 case TRIG_NOW:
1330 control_a |= CGEN;
1331 break;
1332 default:
1333 break;
1334 }
1335
1336 return control_a;
1337}
1338
a351ecf3 1339/* returns appropriate bits for control register c, depending on command */
ea6d0d4c 1340static int control_c_bits(struct comedi_cmd cmd)
a69cc3a9
FMH		 1341{
1342 int control_c;
1343 int aref;
1344
1345 /* set clock source to internal or external, select analog reference,
1346 * select unipolar / bipolar
1347 */
1348 aref = CR_AREF(cmd.chanlist[0]);
a351ecf3 1349 control_c = UQEN; /* enable upper qram addresses */
a69cc3a9
FMH		 1350 if (aref != AREF_DIFF)
1351 control_c |= SD;
1352 if (aref == AREF_COMMON)
1353 control_c |= CMEN;
1354 /* if a unipolar range was selected */
1355 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1356 control_c |= UB;
1357 switch (cmd.scan_begin_src) {
a351ecf3 1358 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1359 switch (cmd.convert_src) {
1360 case TRIG_TIMER:
1361 /* trig on cascaded counters */
1362 control_c |= IPCLK;
1363 break;
1364 case TRIG_EXT:
1365 /* trig on falling edge of external trigger */
1366 control_c |= XPCLK;
1367 break;
1368 default:
1369 break;
1370 }
1371 break;
1372 case TRIG_TIMER:
a351ecf3 1373 /* burst mode with internal pacer clock */
a69cc3a9
FMH		 1374 control_c |= BMDE | IPCLK;
1375 break;
1376 case TRIG_EXT:
a351ecf3 1377 /* burst mode with external trigger */
a69cc3a9
FMH		 1378 control_c |= BMDE | XPCLK;
1379 break;
1380 default:
1381 break;
1382 }
1383
1384 return control_c;
1385}
1386
a351ecf3 1387/* sets up counters */
da91b269 1388static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9 1389{
a351ecf3 1390 /* setup cascaded counters for conversion/scan frequency */
a69cc3a9 1391 switch (cmd.scan_begin_src) {
a351ecf3 1392 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1393 if (cmd.convert_src == TRIG_TIMER) {
1394 /* set conversion frequency */
1395 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1396 &(devpriv->divisor1), &(devpriv->divisor2),
1397 &(cmd.convert_arg),
1398 cmd.flags & TRIG_ROUND_MASK);
1399 if (das1800_set_frequency(dev) < 0) {
1400 return -1;
1401 }
1402 }
1403 break;
a351ecf3 1404 case TRIG_TIMER: /* in burst mode */
a69cc3a9
FMH		 1405 /* set scan frequency */
1406 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
1407 &(devpriv->divisor2), &(cmd.scan_begin_arg),
1408 cmd.flags & TRIG_ROUND_MASK);
1409 if (das1800_set_frequency(dev) < 0) {
1410 return -1;
1411 }
1412 break;
1413 default:
1414 break;
1415 }
1416
a351ecf3 1417 /* setup counter 0 for 'about triggering' */
a69cc3a9 1418 if (cmd.stop_src == TRIG_EXT) {
a351ecf3 1419 /* load counter 0 in mode 0 */
a69cc3a9
FMH		 1420 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1421 }
1422
1423 return 0;
1424}
1425
a351ecf3 1426/* sets up dma */
da91b269 1427static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9
FMH		 1428{
1429 unsigned long lock_flags;
1430 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1431
1432 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1433 return;
1434
1435 /* determine a reasonable dma transfer size */
1436 devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1437 lock_flags = claim_dma_lock();
1438 disable_dma(devpriv->dma0);
1439 /* clear flip-flop to make sure 2-byte registers for
1440 * count and address get set correctly */
1441 clear_dma_ff(devpriv->dma0);
1442 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
a351ecf3 1443 /* set appropriate size of transfer */
a69cc3a9
FMH		 1444 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1445 devpriv->dma_current = devpriv->dma0;
1446 devpriv->dma_current_buf = devpriv->ai_buf0;
1447 enable_dma(devpriv->dma0);
a351ecf3 1448 /* set up dual dma if appropriate */
a69cc3a9
FMH		 1449 if (dual_dma) {
1450 disable_dma(devpriv->dma1);
1451 /* clear flip-flop to make sure 2-byte registers for
1452 * count and address get set correctly */
1453 clear_dma_ff(devpriv->dma1);
1454 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
a351ecf3 1455 /* set appropriate size of transfer */
a69cc3a9
FMH		 1456 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1457 enable_dma(devpriv->dma1);
1458 }
1459 release_dma_lock(lock_flags);
1460
1461 return;
1462}
1463
a351ecf3 1464/* programs channel/gain list into card */
da91b269 1465static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9
FMH		 1466{
1467 int i, n, chan_range;
1468 unsigned long irq_flags;
a351ecf3 1469 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
a69cc3a9
FMH		 1470 const int range_bitshift = 8;
1471
1472 n = cmd.chanlist_len;
a351ecf3 1473 /* spinlock protects indirect addressing */
a69cc3a9
FMH		 1474 comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
1475 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1476 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1477 /* make channel / gain list */
1478 for (i = 0; i < n; i++) {
1479 chan_range =
1480 CR_CHAN(cmd.chanlist[i]) | ((CR_RANGE(cmd.
1481 chanlist[i]) & range_mask) <<
1482 range_bitshift);
1483 outw(chan_range, dev->iobase + DAS1800_QRAM);
1484 }
1485 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1486 comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1487
1488 return;
1489}
1490
a351ecf3 1491/* analog input do_cmd */
da91b269 1492static int das1800_ai_do_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
a69cc3a9
FMH		 1493{
1494 int ret;
1495 int control_a, control_c;
d163679c 1496 struct comedi_async *async = s->async;
ea6d0d4c 1497 struct comedi_cmd cmd = async->cmd;
a69cc3a9
FMH		 1498
1499 if (!dev->irq) {
1500 comedi_error(dev,
1501 "no irq assigned for das-1800, cannot do hardware conversions");
1502 return -1;
1503 }
1504
1505 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1506 * (because dma in handler is unsafe at hard real-time priority) */
1507 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
1508 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1509 } else {
1510 devpriv->irq_dma_bits |= devpriv->dma_bits;
1511 }
a351ecf3 1512 /* interrupt on end of conversion for TRIG_WAKE_EOS */
a69cc3a9 1513 if (cmd.flags & TRIG_WAKE_EOS) {
a351ecf3 1514 /* interrupt fifo not empty */
a69cc3a9
FMH		 1515 devpriv->irq_dma_bits &= ~FIMD;
1516 } else {
a351ecf3 1517 /* interrupt fifo half full */
a69cc3a9
FMH		 1518 devpriv->irq_dma_bits |= FIMD;
1519 }
a351ecf3 1520 /* determine how many conversions we need */
a69cc3a9
FMH		 1521 if (cmd.stop_src == TRIG_COUNT) {
1522 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1523 }
1524
1525 das1800_cancel(dev, s);
1526
a351ecf3 1527 /* determine proper bits for control registers */
a69cc3a9
FMH		 1528 control_a = control_a_bits(cmd);
1529 control_c = control_c_bits(cmd);
1530
1531 /* setup card and start */
1532 program_chanlist(dev, cmd);
1533 ret = setup_counters(dev, cmd);
1534 if (ret < 0) {
1535 comedi_error(dev, "Error setting up counters");
1536 return ret;
1537 }
1538 setup_dma(dev, cmd);
1539 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
a351ecf3 1540 /* set conversion rate and length for burst mode */
a69cc3a9 1541 if (control_c & BMDE) {
a351ecf3 1542 /* program conversion period with number of microseconds minus 1 */
a69cc3a9
FMH		 1543 outb(cmd.convert_arg / 1000 - 1,
1544 dev->iobase + DAS1800_BURST_RATE);
1545 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1546 }
a351ecf3 1547 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
a69cc3a9
FMH		 1548 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1549 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1550
1551 return 0;
1552}
1553
1554/* read analog input */
da91b269
BP		 1555static int das1800_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1556 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1557{
1558 int i, n;
1559 int chan, range, aref, chan_range;
1560 int timeout = 1000;
1561 short dpnt;
1562 int conv_flags = 0;
1563 unsigned long irq_flags;
1564
1565 /* set up analog reference and unipolar / bipolar mode */
1566 aref = CR_AREF(insn->chanspec);
1567 conv_flags |= UQEN;
1568 if (aref != AREF_DIFF)
1569 conv_flags |= SD;
1570 if (aref == AREF_COMMON)
1571 conv_flags |= CMEN;
1572 /* if a unipolar range was selected */
1573 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1574 conv_flags |= UB;
1575
1576 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1577 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1578 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1579 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1580
1581 chan = CR_CHAN(insn->chanspec);
1582 /* mask of unipolar/bipolar bit from range */
1583 range = CR_RANGE(insn->chanspec) & 0x3;
1584 chan_range = chan | (range << 8);
1585 comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
1586 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1587 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1588 outw(chan_range, dev->iobase + DAS1800_QRAM);
1589 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1590 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1591
1592 for (n = 0; n < insn->n; n++) {
1593 /* trigger conversion */
1594 outb(0, dev->iobase + DAS1800_FIFO);
1595 for (i = 0; i < timeout; i++) {
1596 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1597 break;
1598 }
1599 if (i == timeout) {
1600 comedi_error(dev, "timeout");
1601 return -ETIME;
1602 }
1603 dpnt = inw(dev->iobase + DAS1800_FIFO);
1604 /* shift data to offset binary for bipolar ranges */
1605 if ((conv_flags & UB) == 0)
1606 dpnt += 1 << (thisboard->resolution - 1);
1607 data[n] = dpnt;
1608 }
1609 comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1610
1611 return n;
1612}
1613
1614/* writes to an analog output channel */
da91b269
BP		 1615static int das1800_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1616 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1617{
1618 int chan = CR_CHAN(insn->chanspec);
a351ecf3 1619/* int range = CR_RANGE(insn->chanspec); */
a69cc3a9
FMH		 1620 int update_chan = thisboard->ao_n_chan - 1;
1621 short output;
1622 unsigned long irq_flags;
1623
a351ecf3 1624 /* card expects two's complement data */
a69cc3a9 1625 output = data[0] - (1 << (thisboard->resolution - 1));
a351ecf3 1626 /* if the write is to the 'update' channel, we need to remember its value */
a69cc3a9
FMH		 1627 if (chan == update_chan)
1628 devpriv->ao_update_bits = output;
a351ecf3 1629 /* write to channel */
a69cc3a9
FMH		 1630 comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
1631 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1632 outw(output, dev->iobase + DAS1800_DAC);
a351ecf3 1633 /* now we need to write to 'update' channel to update all dac channels */
a69cc3a9
FMH		 1634 if (chan != update_chan) {
1635 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1636 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1637 }
1638 comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1639
1640 return 1;
1641}
1642
1643/* reads from digital input channels */
da91b269
BP		 1644static int das1800_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
1645 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1646{
1647
1648 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1649 data[0] = 0;
1650
1651 return 2;
1652}
1653
1654/* writes to digital output channels */
da91b269
BP		 1655static int das1800_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
1656 struct comedi_insn *insn, unsigned int *data)
a69cc3a9 1657{
790c5541 1658 unsigned int wbits;
a69cc3a9 1659
a351ecf3 1660 /* only set bits that have been masked */
a69cc3a9
FMH		 1661 data[0] &= (1 << s->n_chan) - 1;
1662 wbits = devpriv->do_bits;
1663 wbits &= ~data[0];
1664 wbits |= data[0] & data[1];
1665 devpriv->do_bits = wbits;
1666
1667 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1668
1669 data[1] = devpriv->do_bits;
1670
1671 return 2;
1672}
1673
1674/* loads counters with divisor1, divisor2 from private structure */
da91b269 1675static int das1800_set_frequency(struct comedi_device *dev)
a69cc3a9
FMH		 1676{
1677 int err = 0;
1678
a351ecf3 1679 /* counter 1, mode 2 */
a69cc3a9
FMH		 1680 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1681 2))
1682 err++;
a351ecf3 1683 /* counter 2, mode 2 */
a69cc3a9
FMH		 1684 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1685 2))
1686 err++;
1687 if (err)
1688 return -1;
1689
1690 return 0;
1691}
1692
1693/* converts requested conversion timing to timing compatible with
1694 * hardware, used only when card is in 'burst mode'
1695 */
1696static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1697{
1698 unsigned int micro_sec;
1699
a351ecf3 1700 /* in burst mode, the maximum conversion time is 64 microseconds */
a69cc3a9
FMH		 1701 if (convert_arg > 64000)
1702 convert_arg = 64000;
1703
a351ecf3 1704 /* the conversion time must be an integral number of microseconds */
a69cc3a9
FMH		 1705 switch (round_mode) {
1706 case TRIG_ROUND_NEAREST:
1707 default:
1708 micro_sec = (convert_arg + 500) / 1000;
1709 break;
1710 case TRIG_ROUND_DOWN:
1711 micro_sec = convert_arg / 1000;
1712 break;
1713 case TRIG_ROUND_UP:
1714 micro_sec = (convert_arg - 1) / 1000 + 1;
1715 break;
1716 }
1717
a351ecf3 1718 /* return number of nanoseconds */
a69cc3a9
FMH		 1719 return micro_sec * 1000;
1720}
1721
a351ecf3 1722/* utility function that suggests a dma transfer size based on the conversion period 'ns' */
da91b269 1723static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
a69cc3a9
FMH		 1724{
1725 unsigned int size = DMA_BUF_SIZE;
a351ecf3
BP		 1726 static const int sample_size = 2; /* size in bytes of one sample from board */
1727 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1728 unsigned int max_size; /* maximum size we will allow for a transfer */
a69cc3a9 1729
a351ecf3 1730 /* make dma buffer fill in 0.3 seconds for timed modes */
a69cc3a9 1731 switch (cmd->scan_begin_src) {
a351ecf3 1732 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1733 if (cmd->convert_src == TRIG_TIMER)
1734 size = (fill_time / cmd->convert_arg) * sample_size;
1735 break;
1736 case TRIG_TIMER:
1737 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1738 sample_size;
1739 break;
1740 default:
1741 size = DMA_BUF_SIZE;
1742 break;
1743 }
1744
a351ecf3 1745 /* set a minimum and maximum size allowed */
a69cc3a9 1746 max_size = DMA_BUF_SIZE;
a351ecf3 1747 /* if we are taking limited number of conversions, limit transfer size to that */
a69cc3a9
FMH		 1748 if (cmd->stop_src == TRIG_COUNT &&
1749 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1750 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1751
1752 if (size > max_size)
1753 size = max_size;
1754 if (size < sample_size)
1755 size = sample_size;
1756
1757 return size;
1758}
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