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/drivers/staging/comedi/drivers/das1800.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
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   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 <linux/interrupt.h>
 104#include <linux/slab.h>
 105#include <linux/io.h>
 106#include "../comedidev.h"
 107
 108#include <linux/ioport.h>
 109#include <asm/dma.h>
 110
 111#include "8253.h"
 112#include "comedi_fc.h"
 113
 114/* misc. defines */
 115#define DAS1800_SIZE           16	/* uses 16 io addresses */
 116#define FIFO_SIZE              1024	/*  1024 sample fifo */
 117#define TIMER_BASE             200	/*  5 Mhz master clock */
 118#define UNIPOLAR               0x4	/*  bit that determines whether input range is uni/bipolar */
 119#define DMA_BUF_SIZE           0x1ff00	/*  size in bytes of dma buffers */
 120
 121/* Registers for the das1800 */
 122#define DAS1800_FIFO            0x0
 123#define DAS1800_QRAM            0x0
 124#define DAS1800_DAC             0x0
 125#define DAS1800_SELECT          0x2
 126#define   ADC                     0x0
 127#define   QRAM                    0x1
 128#define   DAC(a)                  (0x2 + a)
 129#define DAS1800_DIGITAL         0x3
 130#define DAS1800_CONTROL_A       0x4
 131#define   FFEN                    0x1
 132#define   CGEN                    0x4
 133#define   CGSL                    0x8
 134#define   TGEN                    0x10
 135#define   TGSL                    0x20
 136#define   ATEN                    0x80
 137#define DAS1800_CONTROL_B       0x5
 138#define   DMA_CH5                 0x1
 139#define   DMA_CH6                 0x2
 140#define   DMA_CH7                 0x3
 141#define   DMA_CH5_CH6             0x5
 142#define   DMA_CH6_CH7             0x6
 143#define   DMA_CH7_CH5             0x7
 144#define   DMA_ENABLED             0x3	/* mask used to determine if dma is enabled */
 145#define   DMA_DUAL                0x4
 146#define   IRQ3                    0x8
 147#define   IRQ5                    0x10
 148#define   IRQ7                    0x18
 149#define   IRQ10                   0x28
 150#define   IRQ11                   0x30
 151#define   IRQ15                   0x38
 152#define   FIMD                    0x40
 153#define DAS1800_CONTROL_C       0X6
 154#define   IPCLK                   0x1
 155#define   XPCLK                   0x3
 156#define   BMDE                    0x4
 157#define   CMEN                    0x8
 158#define   UQEN                    0x10
 159#define   SD                      0x40
 160#define   UB                      0x80
 161#define DAS1800_STATUS          0x7
 162/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
 163#define   CLEAR_INTR_MASK         (CVEN_MASK | 0x1f)
 164#define   INT                     0x1
 165#define   DMATC                   0x2
 166#define   CT0TC                   0x8
 167#define   OVF                     0x10
 168#define   FHF                     0x20
 169#define   FNE                     0x40
 170#define   CVEN_MASK               0x40	/*  masks CVEN on write */
 171#define   CVEN                    0x80
 172#define DAS1800_BURST_LENGTH    0x8
 173#define DAS1800_BURST_RATE      0x9
 174#define DAS1800_QRAM_ADDRESS    0xa
 175#define DAS1800_COUNTER         0xc
 176
 177#define IOBASE2                   0x400	/* offset of additional ioports used on 'ao' cards */
 178
 179enum {
 180	das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
 181	das1702hr_da,
 182	das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
 183	das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
 184};
 185
 186static int das1800_attach(struct comedi_device *dev,
 187			  struct comedi_devconfig *it);
 188static int das1800_detach(struct comedi_device *dev);
 189static int das1800_probe(struct comedi_device *dev);
 190static int das1800_cancel(struct comedi_device *dev,
 191			  struct comedi_subdevice *s);
 192static irqreturn_t das1800_interrupt(int irq, void *d);
 193static int das1800_ai_poll(struct comedi_device *dev,
 194			   struct comedi_subdevice *s);
 195static void das1800_ai_handler(struct comedi_device *dev);
 196static void das1800_handle_dma(struct comedi_device *dev,
 197			       struct comedi_subdevice *s, unsigned int status);
 198static void das1800_flush_dma(struct comedi_device *dev,
 199			      struct comedi_subdevice *s);
 200static void das1800_flush_dma_channel(struct comedi_device *dev,
 201				      struct comedi_subdevice *s,
 202				      unsigned int channel, uint16_t *buffer);
 203static void das1800_handle_fifo_half_full(struct comedi_device *dev,
 204					  struct comedi_subdevice *s);
 205static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
 206					  struct comedi_subdevice *s);
 207static int das1800_ai_do_cmdtest(struct comedi_device *dev,
 208				 struct comedi_subdevice *s,
 209				 struct comedi_cmd *cmd);
 210static int das1800_ai_do_cmd(struct comedi_device *dev,
 211			     struct comedi_subdevice *s);
 212static int das1800_ai_rinsn(struct comedi_device *dev,
 213			    struct comedi_subdevice *s,
 214			    struct comedi_insn *insn, unsigned int *data);
 215static int das1800_ao_winsn(struct comedi_device *dev,
 216			    struct comedi_subdevice *s,
 217			    struct comedi_insn *insn, unsigned int *data);
 218static int das1800_di_rbits(struct comedi_device *dev,
 219			    struct comedi_subdevice *s,
 220			    struct comedi_insn *insn, unsigned int *data);
 221static int das1800_do_wbits(struct comedi_device *dev,
 222			    struct comedi_subdevice *s,
 223			    struct comedi_insn *insn, unsigned int *data);
 224
 225static int das1800_set_frequency(struct comedi_device *dev);
 226static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
 227static unsigned int suggest_transfer_size(struct comedi_cmd *cmd);
 228
 229/* analog input ranges */
 230static const struct comedi_lrange range_ai_das1801 = {
 231	8,
 232	{
 233	 RANGE(-5, 5),
 234	 RANGE(-1, 1),
 235	 RANGE(-0.1, 0.1),
 236	 RANGE(-0.02, 0.02),
 237	 RANGE(0, 5),
 238	 RANGE(0, 1),
 239	 RANGE(0, 0.1),
 240	 RANGE(0, 0.02),
 241	 }
 242};
 243
 244static const struct comedi_lrange range_ai_das1802 = {
 245	8,
 246	{
 247	 RANGE(-10, 10),
 248	 RANGE(-5, 5),
 249	 RANGE(-2.5, 2.5),
 250	 RANGE(-1.25, 1.25),
 251	 RANGE(0, 10),
 252	 RANGE(0, 5),
 253	 RANGE(0, 2.5),
 254	 RANGE(0, 1.25),
 255	 }
 256};
 257
 258struct das1800_board {
 259	const char *name;
 260	int ai_speed;		/* max conversion period in nanoseconds */
 261	int resolution;		/* bits of ai resolution */
 262	int qram_len;		/* length of card's channel / gain queue */
 263	int common;		/* supports AREF_COMMON flag */
 264	int do_n_chan;		/* number of digital output channels */
 265	int ao_ability;		/* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
 266	int ao_n_chan;		/* number of analog out channels */
 267	const struct comedi_lrange *range_ai;	/* available input ranges */
 268};
 269
 270/* Warning: the maximum conversion speeds listed below are
 271 * not always achievable depending on board setup (see
 272 * user manual.)
 273 */
 274static const struct das1800_board das1800_boards[] = {
 275	{
 276	 .name = "das-1701st",
 277	 .ai_speed = 6250,
 278	 .resolution = 12,
 279	 .qram_len = 256,
 280	 .common = 1,
 281	 .do_n_chan = 4,
 282	 .ao_ability = 0,
 283	 .ao_n_chan = 0,
 284	 .range_ai = &range_ai_das1801,
 285	 },
 286	{
 287	 .name = "das-1701st-da",
 288	 .ai_speed = 6250,
 289	 .resolution = 12,
 290	 .qram_len = 256,
 291	 .common = 1,
 292	 .do_n_chan = 4,
 293	 .ao_ability = 1,
 294	 .ao_n_chan = 4,
 295	 .range_ai = &range_ai_das1801,
 296	 },
 297	{
 298	 .name = "das-1702st",
 299	 .ai_speed = 6250,
 300	 .resolution = 12,
 301	 .qram_len = 256,
 302	 .common = 1,
 303	 .do_n_chan = 4,
 304	 .ao_ability = 0,
 305	 .ao_n_chan = 0,
 306	 .range_ai = &range_ai_das1802,
 307	 },
 308	{
 309	 .name = "das-1702st-da",
 310	 .ai_speed = 6250,
 311	 .resolution = 12,
 312	 .qram_len = 256,
 313	 .common = 1,
 314	 .do_n_chan = 4,
 315	 .ao_ability = 1,
 316	 .ao_n_chan = 4,
 317	 .range_ai = &range_ai_das1802,
 318	 },
 319	{
 320	 .name = "das-1702hr",
 321	 .ai_speed = 20000,
 322	 .resolution = 16,
 323	 .qram_len = 256,
 324	 .common = 1,
 325	 .do_n_chan = 4,
 326	 .ao_ability = 0,
 327	 .ao_n_chan = 0,
 328	 .range_ai = &range_ai_das1802,
 329	 },
 330	{
 331	 .name = "das-1702hr-da",
 332	 .ai_speed = 20000,
 333	 .resolution = 16,
 334	 .qram_len = 256,
 335	 .common = 1,
 336	 .do_n_chan = 4,
 337	 .ao_ability = 1,
 338	 .ao_n_chan = 2,
 339	 .range_ai = &range_ai_das1802,
 340	 },
 341	{
 342	 .name = "das-1701ao",
 343	 .ai_speed = 6250,
 344	 .resolution = 12,
 345	 .qram_len = 256,
 346	 .common = 1,
 347	 .do_n_chan = 4,
 348	 .ao_ability = 2,
 349	 .ao_n_chan = 2,
 350	 .range_ai = &range_ai_das1801,
 351	 },
 352	{
 353	 .name = "das-1702ao",
 354	 .ai_speed = 6250,
 355	 .resolution = 12,
 356	 .qram_len = 256,
 357	 .common = 1,
 358	 .do_n_chan = 4,
 359	 .ao_ability = 2,
 360	 .ao_n_chan = 2,
 361	 .range_ai = &range_ai_das1802,
 362	 },
 363	{
 364	 .name = "das-1801st",
 365	 .ai_speed = 3000,
 366	 .resolution = 12,
 367	 .qram_len = 256,
 368	 .common = 1,
 369	 .do_n_chan = 4,
 370	 .ao_ability = 0,
 371	 .ao_n_chan = 0,
 372	 .range_ai = &range_ai_das1801,
 373	 },
 374	{
 375	 .name = "das-1801st-da",
 376	 .ai_speed = 3000,
 377	 .resolution = 12,
 378	 .qram_len = 256,
 379	 .common = 1,
 380	 .do_n_chan = 4,
 381	 .ao_ability = 0,
 382	 .ao_n_chan = 4,
 383	 .range_ai = &range_ai_das1801,
 384	 },
 385	{
 386	 .name = "das-1802st",
 387	 .ai_speed = 3000,
 388	 .resolution = 12,
 389	 .qram_len = 256,
 390	 .common = 1,
 391	 .do_n_chan = 4,
 392	 .ao_ability = 0,
 393	 .ao_n_chan = 0,
 394	 .range_ai = &range_ai_das1802,
 395	 },
 396	{
 397	 .name = "das-1802st-da",
 398	 .ai_speed = 3000,
 399	 .resolution = 12,
 400	 .qram_len = 256,
 401	 .common = 1,
 402	 .do_n_chan = 4,
 403	 .ao_ability = 1,
 404	 .ao_n_chan = 4,
 405	 .range_ai = &range_ai_das1802,
 406	 },
 407	{
 408	 .name = "das-1802hr",
 409	 .ai_speed = 10000,
 410	 .resolution = 16,
 411	 .qram_len = 256,
 412	 .common = 1,
 413	 .do_n_chan = 4,
 414	 .ao_ability = 0,
 415	 .ao_n_chan = 0,
 416	 .range_ai = &range_ai_das1802,
 417	 },
 418	{
 419	 .name = "das-1802hr-da",
 420	 .ai_speed = 10000,
 421	 .resolution = 16,
 422	 .qram_len = 256,
 423	 .common = 1,
 424	 .do_n_chan = 4,
 425	 .ao_ability = 1,
 426	 .ao_n_chan = 2,
 427	 .range_ai = &range_ai_das1802,
 428	 },
 429	{
 430	 .name = "das-1801hc",
 431	 .ai_speed = 3000,
 432	 .resolution = 12,
 433	 .qram_len = 64,
 434	 .common = 0,
 435	 .do_n_chan = 8,
 436	 .ao_ability = 1,
 437	 .ao_n_chan = 2,
 438	 .range_ai = &range_ai_das1801,
 439	 },
 440	{
 441	 .name = "das-1802hc",
 442	 .ai_speed = 3000,
 443	 .resolution = 12,
 444	 .qram_len = 64,
 445	 .common = 0,
 446	 .do_n_chan = 8,
 447	 .ao_ability = 1,
 448	 .ao_n_chan = 2,
 449	 .range_ai = &range_ai_das1802,
 450	 },
 451	{
 452	 .name = "das-1801ao",
 453	 .ai_speed = 3000,
 454	 .resolution = 12,
 455	 .qram_len = 256,
 456	 .common = 1,
 457	 .do_n_chan = 4,
 458	 .ao_ability = 2,
 459	 .ao_n_chan = 2,
 460	 .range_ai = &range_ai_das1801,
 461	 },
 462	{
 463	 .name = "das-1802ao",
 464	 .ai_speed = 3000,
 465	 .resolution = 12,
 466	 .qram_len = 256,
 467	 .common = 1,
 468	 .do_n_chan = 4,
 469	 .ao_ability = 2,
 470	 .ao_n_chan = 2,
 471	 .range_ai = &range_ai_das1802,
 472	 },
 473};
 474
 475/*
 476 * Useful for shorthand access to the particular board structure
 477 */
 478#define thisboard ((const struct das1800_board *)dev->board_ptr)
 479
 480struct das1800_private {
 481	volatile unsigned int count;	/* number of data points left to be taken */
 482	unsigned int divisor1;	/* value to load into board's counter 1 for timed conversions */
 483	unsigned int divisor2;	/* value to load into board's counter 2 for timed conversions */
 484	int do_bits;		/* digital output bits */
 485	int irq_dma_bits;	/* bits for control register b */
 486	/* dma bits for control register b, stored so that dma can be
 487	 * turned on and off */
 488	int dma_bits;
 489	unsigned int dma0;	/* dma channels used */
 490	unsigned int dma1;
 491	volatile unsigned int dma_current;	/* dma channel currently in use */
 492	uint16_t *ai_buf0;	/* pointers to dma buffers */
 493	uint16_t *ai_buf1;
 494	uint16_t *dma_current_buf;	/* pointer to dma buffer currently being used */
 495	unsigned int dma_transfer_size;	/* size of transfer currently used, in bytes */
 496	unsigned long iobase2;	/* secondary io address used for analog out on 'ao' boards */
 497	short ao_update_bits;	/* remembers the last write to the 'update' dac */
 498};
 499
 500#define devpriv ((struct das1800_private *)dev->private)
 501
 502/* analog out range for boards with basic analog out */
 503static const struct comedi_lrange range_ao_1 = {
 504	1,
 505	{
 506	 RANGE(-10, 10),
 507	 }
 508};
 509
 510/* analog out range for 'ao' boards */
 511/*
 512static const struct comedi_lrange range_ao_2 = {
 513	2,
 514	{
 515		RANGE(-10, 10),
 516		RANGE(-5, 5),
 517	}
 518};
 519*/
 520
 521static struct comedi_driver driver_das1800 = {
 522	.driver_name = "das1800",
 523	.module = THIS_MODULE,
 524	.attach = das1800_attach,
 525	.detach = das1800_detach,
 526	.num_names = ARRAY_SIZE(das1800_boards),
 527	.board_name = &das1800_boards[0].name,
 528	.offset = sizeof(struct das1800_board),
 529};
 530
 531/*
 532 * A convenient macro that defines init_module() and cleanup_module(),
 533 * as necessary.
 534 */
 535static int __init driver_das1800_init_module(void)
 536{
 537	return comedi_driver_register(&driver_das1800);
 538}
 539
 540static void __exit driver_das1800_cleanup_module(void)
 541{
 542	comedi_driver_unregister(&driver_das1800);
 543}
 544
 545module_init(driver_das1800_init_module);
 546module_exit(driver_das1800_cleanup_module);
 547
 548static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
 549			    unsigned int dma1)
 550{
 551	unsigned long flags;
 552
 553	/*  need an irq to do dma */
 554	if (dev->irq && dma0) {
 555		/* encode dma0 and dma1 into 2 digit hexadecimal for switch */
 556		switch ((dma0 & 0x7) | (dma1 << 4)) {
 557		case 0x5:	/*  dma0 == 5 */
 558			devpriv->dma_bits |= DMA_CH5;
 559			break;
 560		case 0x6:	/*  dma0 == 6 */
 561			devpriv->dma_bits |= DMA_CH6;
 562			break;
 563		case 0x7:	/*  dma0 == 7 */
 564			devpriv->dma_bits |= DMA_CH7;
 565			break;
 566		case 0x65:	/*  dma0 == 5, dma1 == 6 */
 567			devpriv->dma_bits |= DMA_CH5_CH6;
 568			break;
 569		case 0x76:	/*  dma0 == 6, dma1 == 7 */
 570			devpriv->dma_bits |= DMA_CH6_CH7;
 571			break;
 572		case 0x57:	/*  dma0 == 7, dma1 == 5 */
 573			devpriv->dma_bits |= DMA_CH7_CH5;
 574			break;
 575		default:
 576			printk(" only supports dma channels 5 through 7\n"
 577			       " Dual dma only allows the following combinations:\n"
 578			       " dma 5,6 / 6,7 / or 7,5\n");
 579			return -EINVAL;
 580			break;
 581		}
 582		if (request_dma(dma0, driver_das1800.driver_name)) {
 583			printk(" failed to allocate dma channel %i\n", dma0);
 584			return -EINVAL;
 585		}
 586		devpriv->dma0 = dma0;
 587		devpriv->dma_current = dma0;
 588		if (dma1) {
 589			if (request_dma(dma1, driver_das1800.driver_name)) {
 590				printk(" failed to allocate dma channel %i\n",
 591				       dma1);
 592				return -EINVAL;
 593			}
 594			devpriv->dma1 = dma1;
 595		}
 596		devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
 597		if (devpriv->ai_buf0 == NULL)
 598			return -ENOMEM;
 599		devpriv->dma_current_buf = devpriv->ai_buf0;
 600		if (dma1) {
 601			devpriv->ai_buf1 =
 602			    kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
 603			if (devpriv->ai_buf1 == NULL)
 604				return -ENOMEM;
 605		}
 606		flags = claim_dma_lock();
 607		disable_dma(devpriv->dma0);
 608		set_dma_mode(devpriv->dma0, DMA_MODE_READ);
 609		if (dma1) {
 610			disable_dma(devpriv->dma1);
 611			set_dma_mode(devpriv->dma1, DMA_MODE_READ);
 612		}
 613		release_dma_lock(flags);
 614	}
 615	return 0;
 616}
 617
 618static int das1800_attach(struct comedi_device *dev,
 619			  struct comedi_devconfig *it)
 620{
 621	struct comedi_subdevice *s;
 622	unsigned long iobase = it->options[0];
 623	unsigned int irq = it->options[1];
 624	unsigned int dma0 = it->options[2];
 625	unsigned int dma1 = it->options[3];
 626	unsigned long iobase2;
 627	int board;
 628	int retval;
 629
 630	/* allocate and initialize dev->private */
 631	if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
 632		return -ENOMEM;
 633
 634	printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
 635	       iobase);
 636	if (irq) {
 637		printk(", irq %u", irq);
 638		if (dma0) {
 639			printk(", dma %u", dma0);
 640			if (dma1)
 641				printk(" and %u", dma1);
 642		}
 643	}
 644	printk("\n");
 645
 646	if (iobase == 0) {
 647		printk(" io base address required\n");
 648		return -EINVAL;
 649	}
 650
 651	/* check if io addresses are available */
 652	if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
 653		printk
 654		    (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
 655		     iobase, iobase + DAS1800_SIZE - 1);
 656		return -EIO;
 657	}
 658	dev->iobase = iobase;
 659
 660	board = das1800_probe(dev);
 661	if (board < 0) {
 662		printk(" unable to determine board type\n");
 663		return -ENODEV;
 664	}
 665
 666	dev->board_ptr = das1800_boards + board;
 667	dev->board_name = thisboard->name;
 668
 669	/*  if it is an 'ao' board with fancy analog out then we need extra io ports */
 670	if (thisboard->ao_ability == 2) {
 671		iobase2 = iobase + IOBASE2;
 672		if (!request_region(iobase2, DAS1800_SIZE,
 673				    driver_das1800.driver_name)) {
 674			printk
 675			    (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
 676			     iobase2, iobase2 + DAS1800_SIZE - 1);
 677			return -EIO;
 678		}
 679		devpriv->iobase2 = iobase2;
 680	}
 681
 682	/* grab our IRQ */
 683	if (irq) {
 684		if (request_irq(irq, das1800_interrupt, 0,
 685				driver_das1800.driver_name, dev)) {
 686			printk(" unable to allocate irq %u\n", irq);
 687			return -EINVAL;
 688		}
 689	}
 690	dev->irq = irq;
 691
 692	/*  set bits that tell card which irq to use */
 693	switch (irq) {
 694	case 0:
 695		break;
 696	case 3:
 697		devpriv->irq_dma_bits |= 0x8;
 698		break;
 699	case 5:
 700		devpriv->irq_dma_bits |= 0x10;
 701		break;
 702	case 7:
 703		devpriv->irq_dma_bits |= 0x18;
 704		break;
 705	case 10:
 706		devpriv->irq_dma_bits |= 0x28;
 707		break;
 708	case 11:
 709		devpriv->irq_dma_bits |= 0x30;
 710		break;
 711	case 15:
 712		devpriv->irq_dma_bits |= 0x38;
 713		break;
 714	default:
 715		printk(" irq out of range\n");
 716		return -EINVAL;
 717		break;
 718	}
 719
 720	retval = das1800_init_dma(dev, dma0, dma1);
 721	if (retval < 0)
 722		return retval;
 723
 724	if (devpriv->ai_buf0 == NULL) {
 725		devpriv->ai_buf0 =
 726		    kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
 727		if (devpriv->ai_buf0 == NULL)
 728			return -ENOMEM;
 729	}
 730
 731	if (alloc_subdevices(dev, 4) < 0)
 732		return -ENOMEM;
 733
 734	/* analog input subdevice */
 735	s = dev->subdevices + 0;
 736	dev->read_subdev = s;
 737	s->type = COMEDI_SUBD_AI;
 738	s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
 739	if (thisboard->common)
 740		s->subdev_flags |= SDF_COMMON;
 741	s->n_chan = thisboard->qram_len;
 742	s->len_chanlist = thisboard->qram_len;
 743	s->maxdata = (1 << thisboard->resolution) - 1;
 744	s->range_table = thisboard->range_ai;
 745	s->do_cmd = das1800_ai_do_cmd;
 746	s->do_cmdtest = das1800_ai_do_cmdtest;
 747	s->insn_read = das1800_ai_rinsn;
 748	s->poll = das1800_ai_poll;
 749	s->cancel = das1800_cancel;
 750
 751	/* analog out */
 752	s = dev->subdevices + 1;
 753	if (thisboard->ao_ability == 1) {
 754		s->type = COMEDI_SUBD_AO;
 755		s->subdev_flags = SDF_WRITABLE;
 756		s->n_chan = thisboard->ao_n_chan;
 757		s->maxdata = (1 << thisboard->resolution) - 1;
 758		s->range_table = &range_ao_1;
 759		s->insn_write = das1800_ao_winsn;
 760	} else {
 761		s->type = COMEDI_SUBD_UNUSED;
 762	}
 763
 764	/* di */
 765	s = dev->subdevices + 2;
 766	s->type = COMEDI_SUBD_DI;
 767	s->subdev_flags = SDF_READABLE;
 768	s->n_chan = 4;
 769	s->maxdata = 1;
 770	s->range_table = &range_digital;
 771	s->insn_bits = das1800_di_rbits;
 772
 773	/* do */
 774	s = dev->subdevices + 3;
 775	s->type = COMEDI_SUBD_DO;
 776	s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
 777	s->n_chan = thisboard->do_n_chan;
 778	s->maxdata = 1;
 779	s->range_table = &range_digital;
 780	s->insn_bits = das1800_do_wbits;
 781
 782	das1800_cancel(dev, dev->read_subdev);
 783
 784	/*  initialize digital out channels */
 785	outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
 786
 787	/*  initialize analog out channels */
 788	if (thisboard->ao_ability == 1) {
 789		/*  select 'update' dac channel for baseAddress + 0x0 */
 790		outb(DAC(thisboard->ao_n_chan - 1),
 791		     dev->iobase + DAS1800_SELECT);
 792		outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
 793	}
 794
 795	return 0;
 796};
 797
 798static int das1800_detach(struct comedi_device *dev)
 799{
 800	/* only free stuff if it has been allocated by _attach */
 801	if (dev->iobase)
 802		release_region(dev->iobase, DAS1800_SIZE);
 803	if (dev->irq)
 804		free_irq(dev->irq, dev);
 805	if (dev->private) {
 806		if (devpriv->iobase2)
 807			release_region(devpriv->iobase2, DAS1800_SIZE);
 808		if (devpriv->dma0)
 809			free_dma(devpriv->dma0);
 810		if (devpriv->dma1)
 811			free_dma(devpriv->dma1);
 812		kfree(devpriv->ai_buf0);
 813		kfree(devpriv->ai_buf1);
 814	}
 815
 816	printk("comedi%d: %s: remove\n", dev->minor,
 817	       driver_das1800.driver_name);
 818
 819	return 0;
 820};
 821
 822/* probes and checks das-1800 series board type
 823 */
 824static int das1800_probe(struct comedi_device *dev)
 825{
 826	int id;
 827	int board;
 828
 829	id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf;	/* get id bits */
 830	board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
 831
 832	switch (id) {
 833	case 0x3:
 834		if (board == das1801st_da || board == das1802st_da ||
 835		    board == das1701st_da || board == das1702st_da) {
 836			printk(" Board model: %s\n",
 837			       das1800_boards[board].name);
 838			return board;
 839		}
 840		printk
 841		    (" Board model (probed, not recommended): das-1800st-da series\n");
 842		return das1801st;
 843		break;
 844	case 0x4:
 845		if (board == das1802hr_da || board == das1702hr_da) {
 846			printk(" Board model: %s\n",
 847			       das1800_boards[board].name);
 848			return board;
 849		}
 850		printk
 851		    (" Board model (probed, not recommended): das-1802hr-da\n");
 852		return das1802hr;
 853		break;
 854	case 0x5:
 855		if (board == das1801ao || board == das1802ao ||
 856		    board == das1701ao || board == das1702ao) {
 857			printk(" Board model: %s\n",
 858			       das1800_boards[board].name);
 859			return board;
 860		}
 861		printk
 862		    (" Board model (probed, not recommended): das-1800ao series\n");
 863		return das1801ao;
 864		break;
 865	case 0x6:
 866		if (board == das1802hr || board == das1702hr) {
 867			printk(" Board model: %s\n",
 868			       das1800_boards[board].name);
 869			return board;
 870		}
 871		printk(" Board model (probed, not recommended): das-1802hr\n");
 872		return das1802hr;
 873		break;
 874	case 0x7:
 875		if (board == das1801st || board == das1802st ||
 876		    board == das1701st || board == das1702st) {
 877			printk(" Board model: %s\n",
 878			       das1800_boards[board].name);
 879			return board;
 880		}
 881		printk
 882		    (" Board model (probed, not recommended): das-1800st series\n");
 883		return das1801st;
 884		break;
 885	case 0x8:
 886		if (board == das1801hc || board == das1802hc) {
 887			printk(" Board model: %s\n",
 888			       das1800_boards[board].name);
 889			return board;
 890		}
 891		printk
 892		    (" Board model (probed, not recommended): das-1800hc series\n");
 893		return das1801hc;
 894		break;
 895	default:
 896		printk
 897		    (" Board model: probe returned 0x%x (unknown, please report)\n",
 898		     id);
 899		return board;
 900		break;
 901	}
 902	return -1;
 903}
 904
 905static int das1800_ai_poll(struct comedi_device *dev,
 906			   struct comedi_subdevice *s)
 907{
 908	unsigned long flags;
 909
 910	/*  prevent race with interrupt handler */
 911	spin_lock_irqsave(&dev->spinlock, flags);
 912	das1800_ai_handler(dev);
 913	spin_unlock_irqrestore(&dev->spinlock, flags);
 914
 915	return s->async->buf_write_count - s->async->buf_read_count;
 916}
 917
 918static irqreturn_t das1800_interrupt(int irq, void *d)
 919{
 920	struct comedi_device *dev = d;
 921	unsigned int status;
 922
 923	if (dev->attached == 0) {
 924		comedi_error(dev, "premature interrupt");
 925		return IRQ_HANDLED;
 926	}
 927
 928	/* Prevent race with das1800_ai_poll() on multi processor systems.
 929	 * Also protects indirect addressing in das1800_ai_handler */
 930	spin_lock(&dev->spinlock);
 931	status = inb(dev->iobase + DAS1800_STATUS);
 932
 933	/* if interrupt was not caused by das-1800 */
 934	if (!(status & INT)) {
 935		spin_unlock(&dev->spinlock);
 936		return IRQ_NONE;
 937	}
 938	/* clear the interrupt status bit INT */
 939	outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
 940	/*  handle interrupt */
 941	das1800_ai_handler(dev);
 942
 943	spin_unlock(&dev->spinlock);
 944	return IRQ_HANDLED;
 945}
 946
 947/* the guts of the interrupt handler, that is shared with das1800_ai_poll */
 948static void das1800_ai_handler(struct comedi_device *dev)
 949{
 950	struct comedi_subdevice *s = dev->subdevices + 0;	/* analog input subdevice */
 951	struct comedi_async *async = s->async;
 952	struct comedi_cmd *cmd = &async->cmd;
 953	unsigned int status = inb(dev->iobase + DAS1800_STATUS);
 954
 955	async->events = 0;
 956	/*  select adc for base address + 0 */
 957	outb(ADC, dev->iobase + DAS1800_SELECT);
 958	/*  dma buffer full */
 959	if (devpriv->irq_dma_bits & DMA_ENABLED) {
 960		/*  look for data from dma transfer even if dma terminal count hasn't happened yet */
 961		das1800_handle_dma(dev, s, status);
 962	} else if (status & FHF) {	/*  if fifo half full */
 963		das1800_handle_fifo_half_full(dev, s);
 964	} else if (status & FNE) {	/*  if fifo not empty */
 965		das1800_handle_fifo_not_empty(dev, s);
 966	}
 967
 968	async->events |= COMEDI_CB_BLOCK;
 969	/* if the card's fifo has overflowed */
 970	if (status & OVF) {
 971		/*  clear OVF interrupt bit */
 972		outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
 973		comedi_error(dev, "DAS1800 FIFO overflow");
 974		das1800_cancel(dev, s);
 975		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 976		comedi_event(dev, s);
 977		return;
 978	}
 979	/*  stop taking data if appropriate */
 980	/* stop_src TRIG_EXT */
 981	if (status & CT0TC) {
 982		/*  clear CT0TC interrupt bit */
 983		outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
 984		/*  make sure we get all remaining data from board before quitting */
 985		if (devpriv->irq_dma_bits & DMA_ENABLED)
 986			das1800_flush_dma(dev, s);
 987		else
 988			das1800_handle_fifo_not_empty(dev, s);
 989		das1800_cancel(dev, s);	/* disable hardware conversions */
 990		async->events |= COMEDI_CB_EOA;
 991	} else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) {	/*  stop_src TRIG_COUNT */
 992		das1800_cancel(dev, s);	/* disable hardware conversions */
 993		async->events |= COMEDI_CB_EOA;
 994	}
 995
 996	comedi_event(dev, s);
 997
 998	return;
 999}
1000
1001static void das1800_handle_dma(struct comedi_device *dev,
1002			       struct comedi_subdevice *s, unsigned int status)
1003{
1004	unsigned long flags;
1005	const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1006
1007	flags = claim_dma_lock();
1008	das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1009				  devpriv->dma_current_buf);
1010	/*  re-enable  dma channel */
1011	set_dma_addr(devpriv->dma_current,
1012		     virt_to_bus(devpriv->dma_current_buf));
1013	set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
1014	enable_dma(devpriv->dma_current);
1015	release_dma_lock(flags);
1016
1017	if (status & DMATC) {
1018		/*  clear DMATC interrupt bit */
1019		outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
1020		/*  switch dma channels for next time, if appropriate */
1021		if (dual_dma) {
1022			/*  read data from the other channel next time */
1023			if (devpriv->dma_current == devpriv->dma0) {
1024				devpriv->dma_current = devpriv->dma1;
1025				devpriv->dma_current_buf = devpriv->ai_buf1;
1026			} else {
1027				devpriv->dma_current = devpriv->dma0;
1028				devpriv->dma_current_buf = devpriv->ai_buf0;
1029			}
1030		}
1031	}
1032
1033	return;
1034}
1035
1036static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
1037					    uint16_t sample)
1038{
1039	sample += 1 << (thisboard->resolution - 1);
1040	return sample;
1041}
1042
1043static void munge_data(struct comedi_device *dev, uint16_t * array,
1044		       unsigned int num_elements)
1045{
1046	unsigned int i;
1047	int unipolar;
1048
1049	/* see if card is using a unipolar or bipolar range so we can munge data correctly */
1050	unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1051
1052	/* convert to unsigned type if we are in a bipolar mode */
1053	if (!unipolar) {
1054		for (i = 0; i < num_elements; i++)
1055			array[i] = munge_bipolar_sample(dev, array[i]);
1056	}
1057}
1058
1059/* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1060 * Assumes dma lock is held */
1061static void das1800_flush_dma_channel(struct comedi_device *dev,
1062				      struct comedi_subdevice *s,
1063				      unsigned int channel, uint16_t *buffer)
1064{
1065	unsigned int num_bytes, num_samples;
1066	struct comedi_cmd *cmd = &s->async->cmd;
1067
1068	disable_dma(channel);
1069
1070	/* clear flip-flop to make sure 2-byte registers
1071	 * get set correctly */
1072	clear_dma_ff(channel);
1073
1074	/*  figure out how many points to read */
1075	num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
1076	num_samples = num_bytes / sizeof(short);
1077
1078	/* if we only need some of the points */
1079	if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1080		num_samples = devpriv->count;
1081
1082	munge_data(dev, buffer, num_samples);
1083	cfc_write_array_to_buffer(s, buffer, num_bytes);
1084	if (s->async->cmd.stop_src == TRIG_COUNT)
1085		devpriv->count -= num_samples;
1086
1087	return;
1088}
1089
1090/* flushes remaining data from board when external trigger has stopped acquisition
1091 * and we are using dma transfers */
1092static void das1800_flush_dma(struct comedi_device *dev,
1093			      struct comedi_subdevice *s)
1094{
1095	unsigned long flags;
1096	const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1097
1098	flags = claim_dma_lock();
1099	das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1100				  devpriv->dma_current_buf);
1101
1102	if (dual_dma) {
1103		/*  switch to other channel and flush it */
1104		if (devpriv->dma_current == devpriv->dma0) {
1105			devpriv->dma_current = devpriv->dma1;
1106			devpriv->dma_current_buf = devpriv->ai_buf1;
1107		} else {
1108			devpriv->dma_current = devpriv->dma0;
1109			devpriv->dma_current_buf = devpriv->ai_buf0;
1110		}
1111		das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1112					  devpriv->dma_current_buf);
1113	}
1114
1115	release_dma_lock(flags);
1116
1117	/*  get any remaining samples in fifo */
1118	das1800_handle_fifo_not_empty(dev, s);
1119
1120	return;
1121}
1122
1123static void das1800_handle_fifo_half_full(struct comedi_device *dev,
1124					  struct comedi_subdevice *s)
1125{
1126	int numPoints = 0;	/* number of points to read */
1127	struct comedi_cmd *cmd = &s->async->cmd;
1128
1129	numPoints = FIFO_SIZE / 2;
1130	/* if we only need some of the points */
1131	if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1132		numPoints = devpriv->count;
1133	insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1134	munge_data(dev, devpriv->ai_buf0, numPoints);
1135	cfc_write_array_to_buffer(s, devpriv->ai_buf0,
1136				  numPoints * sizeof(devpriv->ai_buf0[0]));
1137	if (cmd->stop_src == TRIG_COUNT)
1138		devpriv->count -= numPoints;
1139	return;
1140}
1141
1142static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
1143					  struct comedi_subdevice *s)
1144{
1145	short dpnt;
1146	int unipolar;
1147	struct comedi_cmd *cmd = &s->async->cmd;
1148
1149	unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1150
1151	while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1152		if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1153			break;
1154		dpnt = inw(dev->iobase + DAS1800_FIFO);
1155		/* convert to unsigned type if we are in a bipolar mode */
1156		if (!unipolar)
1157			;
1158		dpnt = munge_bipolar_sample(dev, dpnt);
1159		cfc_write_to_buffer(s, dpnt);
1160		if (cmd->stop_src == TRIG_COUNT)
1161			devpriv->count--;
1162	}
1163
1164	return;
1165}
1166
1167static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1168{
1169	outb(0x0, dev->iobase + DAS1800_STATUS);	/* disable conversions */
1170	outb(0x0, dev->iobase + DAS1800_CONTROL_B);	/* disable interrupts and dma */
1171	outb(0x0, dev->iobase + DAS1800_CONTROL_A);	/* disable and clear fifo and stop triggering */
1172	if (devpriv->dma0)
1173		disable_dma(devpriv->dma0);
1174	if (devpriv->dma1)
1175		disable_dma(devpriv->dma1);
1176	return 0;
1177}
1178
1179/* test analog input cmd */
1180static int das1800_ai_do_cmdtest(struct comedi_device *dev,
1181				 struct comedi_subdevice *s,
1182				 struct comedi_cmd *cmd)
1183{
1184	int err = 0;
1185	int tmp;
1186	unsigned int tmp_arg;
1187	int i;
1188	int unipolar;
1189
1190	/* step 1: make sure trigger sources are trivially valid */
1191
1192	tmp = cmd->start_src;
1193	cmd->start_src &= TRIG_NOW | TRIG_EXT;
1194	if (!cmd->start_src || tmp != cmd->start_src)
1195		err++;
1196
1197	tmp = cmd->scan_begin_src;
1198	cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1199	if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1200		err++;
1201
1202	tmp = cmd->convert_src;
1203	cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1204	if (!cmd->convert_src || tmp != cmd->convert_src)
1205		err++;
1206
1207	tmp = cmd->scan_end_src;
1208	cmd->scan_end_src &= TRIG_COUNT;
1209	if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1210		err++;
1211
1212	tmp = cmd->stop_src;
1213	cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1214	if (!cmd->stop_src || tmp != cmd->stop_src)
1215		err++;
1216
1217	if (err)
1218		return 1;
1219
1220	/* step 2: make sure trigger sources are unique and mutually compatible */
1221
1222	/*  uniqueness check */
1223	if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1224		err++;
1225	if (cmd->scan_begin_src != TRIG_FOLLOW &&
1226	    cmd->scan_begin_src != TRIG_TIMER &&
1227	    cmd->scan_begin_src != TRIG_EXT)
1228		err++;
1229	if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1230		err++;
1231	if (cmd->stop_src != TRIG_COUNT &&
1232	    cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
1233		err++;
1234	/* compatibility check */
1235	if (cmd->scan_begin_src != TRIG_FOLLOW &&
1236	    cmd->convert_src != TRIG_TIMER)
1237		err++;
1238
1239	if (err)
1240		return 2;
1241
1242	/* step 3: make sure arguments are trivially compatible */
1243
1244	if (cmd->start_arg != 0) {
1245		cmd->start_arg = 0;
1246		err++;
1247	}
1248	if (cmd->convert_src == TRIG_TIMER) {
1249		if (cmd->convert_arg < thisboard->ai_speed) {
1250			cmd->convert_arg = thisboard->ai_speed;
1251			err++;
1252		}
1253	}
1254	if (!cmd->chanlist_len) {
1255		cmd->chanlist_len = 1;
1256		err++;
1257	}
1258	if (cmd->scan_end_arg != cmd->chanlist_len) {
1259		cmd->scan_end_arg = cmd->chanlist_len;
1260		err++;
1261	}
1262
1263	switch (cmd->stop_src) {
1264	case TRIG_COUNT:
1265		if (!cmd->stop_arg) {
1266			cmd->stop_arg = 1;
1267			err++;
1268		}
1269		break;
1270	case TRIG_NONE:
1271		if (cmd->stop_arg != 0) {
1272			cmd->stop_arg = 0;
1273			err++;
1274		}
1275		break;
1276	default:
1277		break;
1278	}
1279
1280	if (err)
1281		return 3;
1282
1283	/* step 4: fix up any arguments */
1284
1285	if (cmd->convert_src == TRIG_TIMER) {
1286		/*  if we are not in burst mode */
1287		if (cmd->scan_begin_src == TRIG_FOLLOW) {
1288			tmp_arg = cmd->convert_arg;
1289			/* calculate counter values that give desired timing */
1290			i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1291						       &(devpriv->divisor1),
1292						       &(devpriv->divisor2),
1293						       &(cmd->convert_arg),
1294						       cmd->
1295						       flags & TRIG_ROUND_MASK);
1296			if (tmp_arg != cmd->convert_arg)
1297				err++;
1298		}
1299		/*  if we are in burst mode */
1300		else {
1301			/*  check that convert_arg is compatible */
1302			tmp_arg = cmd->convert_arg;
1303			cmd->convert_arg =
1304			    burst_convert_arg(cmd->convert_arg,
1305					      cmd->flags & TRIG_ROUND_MASK);
1306			if (tmp_arg != cmd->convert_arg)
1307				err++;
1308
1309			if (cmd->scan_begin_src == TRIG_TIMER) {
1310				/*  if scans are timed faster than conversion rate allows */
1311				if (cmd->convert_arg * cmd->chanlist_len >
1312				    cmd->scan_begin_arg) {
1313					cmd->scan_begin_arg =
1314					    cmd->convert_arg *
1315					    cmd->chanlist_len;
1316					err++;
1317				}
1318				tmp_arg = cmd->scan_begin_arg;
1319				/* calculate counter values that give desired timing */
1320				i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1321							       &(devpriv->
1322								 divisor1),
1323							       &(devpriv->
1324								 divisor2),
1325							       &(cmd->
1326								 scan_begin_arg),
1327							       cmd->
1328							       flags &
1329							       TRIG_ROUND_MASK);
1330				if (tmp_arg != cmd->scan_begin_arg)
1331					err++;
1332			}
1333		}
1334	}
1335
1336	if (err)
1337		return 4;
1338
1339	/*  make sure user is not trying to mix unipolar and bipolar ranges */
1340	if (cmd->chanlist) {
1341		unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1342		for (i = 1; i < cmd->chanlist_len; i++) {
1343			if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1344				comedi_error(dev,
1345					     "unipolar and bipolar ranges cannot be mixed in the chanlist");
1346				err++;
1347				break;
1348			}
1349		}
1350	}
1351
1352	if (err)
1353		return 5;
1354
1355	return 0;
1356}
1357
1358/* analog input cmd interface */
1359
1360/* first, some utility functions used in the main ai_do_cmd() */
1361
1362/* returns appropriate bits for control register a, depending on command */
1363static int control_a_bits(struct comedi_cmd cmd)
1364{
1365	int control_a;
1366
1367	control_a = FFEN;	/* enable fifo */
1368	if (cmd.stop_src == TRIG_EXT)
1369		control_a |= ATEN;
1370	switch (cmd.start_src) {
1371	case TRIG_EXT:
1372		control_a |= TGEN | CGSL;
1373		break;
1374	case TRIG_NOW:
1375		control_a |= CGEN;
1376		break;
1377	default:
1378		break;
1379	}
1380
1381	return control_a;
1382}
1383
1384/* returns appropriate bits for control register c, depending on command */
1385static int control_c_bits(struct comedi_cmd cmd)
1386{
1387	int control_c;
1388	int aref;
1389
1390	/* set clock source to internal or external, select analog reference,
1391	 * select unipolar / bipolar
1392	 */
1393	aref = CR_AREF(cmd.chanlist[0]);
1394	control_c = UQEN;	/* enable upper qram addresses */
1395	if (aref != AREF_DIFF)
1396		control_c |= SD;
1397	if (aref == AREF_COMMON)
1398		control_c |= CMEN;
1399	/* if a unipolar range was selected */
1400	if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1401		control_c |= UB;
1402	switch (cmd.scan_begin_src) {
1403	case TRIG_FOLLOW:	/*  not in burst mode */
1404		switch (cmd.convert_src) {
1405		case TRIG_TIMER:
1406			/* trig on cascaded counters */
1407			control_c |= IPCLK;
1408			break;
1409		case TRIG_EXT:
1410			/* trig on falling edge of external trigger */
1411			control_c |= XPCLK;
1412			break;
1413		default:
1414			break;
1415		}
1416		break;
1417	case TRIG_TIMER:
1418		/*  burst mode with internal pacer clock */
1419		control_c |= BMDE | IPCLK;
1420		break;
1421	case TRIG_EXT:
1422		/*  burst mode with external trigger */
1423		control_c |= BMDE | XPCLK;
1424		break;
1425	default:
1426		break;
1427	}
1428
1429	return control_c;
1430}
1431
1432/* sets up counters */
1433static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
1434{
1435	/*  setup cascaded counters for conversion/scan frequency */
1436	switch (cmd.scan_begin_src) {
1437	case TRIG_FOLLOW:	/*  not in burst mode */
1438		if (cmd.convert_src == TRIG_TIMER) {
1439			/* set conversion frequency */
1440			i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1441						       &(devpriv->divisor1),
1442						       &(devpriv->divisor2),
1443						       &(cmd.convert_arg),
1444						       cmd.
1445						       flags & TRIG_ROUND_MASK);
1446			if (das1800_set_frequency(dev) < 0)
1447				return -1;
1448		}
1449		break;
1450	case TRIG_TIMER:	/*  in burst mode */
1451		/* set scan frequency */
1452		i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
1453					       &(devpriv->divisor2),
1454					       &(cmd.scan_begin_arg),
1455					       cmd.flags & TRIG_ROUND_MASK);
1456		if (das1800_set_frequency(dev) < 0)
1457			return -1;
1458		break;
1459	default:
1460		break;
1461	}
1462
1463	/*  setup counter 0 for 'about triggering' */
1464	if (cmd.stop_src == TRIG_EXT) {
1465		/*  load counter 0 in mode 0 */
1466		i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1467	}
1468
1469	return 0;
1470}
1471
1472/* sets up dma */
1473static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
1474{
1475	unsigned long lock_flags;
1476	const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1477
1478	if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1479		return;
1480
1481	/* determine a reasonable dma transfer size */
1482	devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1483	lock_flags = claim_dma_lock();
1484	disable_dma(devpriv->dma0);
1485	/* clear flip-flop to make sure 2-byte registers for
1486	 * count and address get set correctly */
1487	clear_dma_ff(devpriv->dma0);
1488	set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1489	/*  set appropriate size of transfer */
1490	set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1491	devpriv->dma_current = devpriv->dma0;
1492	devpriv->dma_current_buf = devpriv->ai_buf0;
1493	enable_dma(devpriv->dma0);
1494	/*  set up dual dma if appropriate */
1495	if (dual_dma) {
1496		disable_dma(devpriv->dma1);
1497		/* clear flip-flop to make sure 2-byte registers for
1498		 * count and address get set correctly */
1499		clear_dma_ff(devpriv->dma1);
1500		set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1501		/*  set appropriate size of transfer */
1502		set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1503		enable_dma(devpriv->dma1);
1504	}
1505	release_dma_lock(lock_flags);
1506
1507	return;
1508}
1509
1510/* programs channel/gain list into card */
1511static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
1512{
1513	int i, n, chan_range;
1514	unsigned long irq_flags;
1515	const int range_mask = 0x3;	/* masks unipolar/bipolar bit off range */
1516	const int range_bitshift = 8;
1517
1518	n = cmd.chanlist_len;
1519	/*  spinlock protects indirect addressing */
1520	spin_lock_irqsave(&dev->spinlock, irq_flags);
1521	outb(QRAM, dev->iobase + DAS1800_SELECT);	/* select QRAM for baseAddress + 0x0 */
1522	outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);	/*set QRAM address start */
1523	/* make channel / gain list */
1524	for (i = 0; i < n; i++) {
1525		chan_range =
1526		    CR_CHAN(cmd.
1527			    chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) &
1528					     range_mask) << range_bitshift);
1529		outw(chan_range, dev->iobase + DAS1800_QRAM);
1530	}
1531	outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);	/*finish write to QRAM */
1532	spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1533
1534	return;
1535}
1536
1537/* analog input do_cmd */
1538static int das1800_ai_do_cmd(struct comedi_device *dev,
1539			     struct comedi_subdevice *s)
1540{
1541	int ret;
1542	int control_a, control_c;
1543	struct comedi_async *async = s->async;
1544	struct comedi_cmd cmd = async->cmd;
1545
1546	if (!dev->irq) {
1547		comedi_error(dev,
1548			     "no irq assigned for das-1800, cannot do hardware conversions");
1549		return -1;
1550	}
1551
1552	/* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1553	 * (because dma in handler is unsafe at hard real-time priority) */
1554	if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT))
1555		devpriv->irq_dma_bits &= ~DMA_ENABLED;
1556	else
1557		devpriv->irq_dma_bits |= devpriv->dma_bits;
1558	/*  interrupt on end of conversion for TRIG_WAKE_EOS */
1559	if (cmd.flags & TRIG_WAKE_EOS) {
1560		/*  interrupt fifo not empty */
1561		devpriv->irq_dma_bits &= ~FIMD;
1562	} else {
1563		/*  interrupt fifo half full */
1564		devpriv->irq_dma_bits |= FIMD;
1565	}
1566	/*  determine how many conversions we need */
1567	if (cmd.stop_src == TRIG_COUNT)
1568		devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1569
1570	das1800_cancel(dev, s);
1571
1572	/*  determine proper bits for control registers */
1573	control_a = control_a_bits(cmd);
1574	control_c = control_c_bits(cmd);
1575
1576	/* setup card and start */
1577	program_chanlist(dev, cmd);
1578	ret = setup_counters(dev, cmd);
1579	if (ret < 0) {
1580		comedi_error(dev, "Error setting up counters");
1581		return ret;
1582	}
1583	setup_dma(dev, cmd);
1584	outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1585	/*  set conversion rate and length for burst mode */
1586	if (control_c & BMDE) {
1587		/*  program conversion period with number of microseconds minus 1 */
1588		outb(cmd.convert_arg / 1000 - 1,
1589		     dev->iobase + DAS1800_BURST_RATE);
1590		outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1591	}
1592	outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B);	/*  enable irq/dma */
1593	outb(control_a, dev->iobase + DAS1800_CONTROL_A);	/* enable fifo and triggering */
1594	outb(CVEN, dev->iobase + DAS1800_STATUS);	/* enable conversions */
1595
1596	return 0;
1597}
1598
1599/* read analog input */
1600static int das1800_ai_rinsn(struct comedi_device *dev,
1601			    struct comedi_subdevice *s,
1602			    struct comedi_insn *insn, unsigned int *data)
1603{
1604	int i, n;
1605	int chan, range, aref, chan_range;
1606	int timeout = 1000;
1607	short dpnt;
1608	int conv_flags = 0;
1609	unsigned long irq_flags;
1610
1611	/* set up analog reference and unipolar / bipolar mode */
1612	aref = CR_AREF(insn->chanspec);
1613	conv_flags |= UQEN;
1614	if (aref != AREF_DIFF)
1615		conv_flags |= SD;
1616	if (aref == AREF_COMMON)
1617		conv_flags |= CMEN;
1618	/* if a unipolar range was selected */
1619	if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1620		conv_flags |= UB;
1621
1622	outb(conv_flags, dev->iobase + DAS1800_CONTROL_C);	/* software conversion enabled */
1623	outb(CVEN, dev->iobase + DAS1800_STATUS);	/* enable conversions */
1624	outb(0x0, dev->iobase + DAS1800_CONTROL_A);	/* reset fifo */
1625	outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1626
1627	chan = CR_CHAN(insn->chanspec);
1628	/* mask of unipolar/bipolar bit from range */
1629	range = CR_RANGE(insn->chanspec) & 0x3;
1630	chan_range = chan | (range << 8);
1631	spin_lock_irqsave(&dev->spinlock, irq_flags);
1632	outb(QRAM, dev->iobase + DAS1800_SELECT);	/* select QRAM for baseAddress + 0x0 */
1633	outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);	/* set QRAM address start */
1634	outw(chan_range, dev->iobase + DAS1800_QRAM);
1635	outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);	/*finish write to QRAM */
1636	outb(ADC, dev->iobase + DAS1800_SELECT);	/* select ADC for baseAddress + 0x0 */
1637
1638	for (n = 0; n < insn->n; n++) {
1639		/* trigger conversion */
1640		outb(0, dev->iobase + DAS1800_FIFO);
1641		for (i = 0; i < timeout; i++) {
1642			if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1643				break;
1644		}
1645		if (i == timeout) {
1646			comedi_error(dev, "timeout");
1647			n = -ETIME;
1648			goto exit;
1649		}
1650		dpnt = inw(dev->iobase + DAS1800_FIFO);
1651		/* shift data to offset binary for bipolar ranges */
1652		if ((conv_flags & UB) == 0)
1653			dpnt += 1 << (thisboard->resolution - 1);
1654		data[n] = dpnt;
1655	}
1656exit:
1657	spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1658
1659	return n;
1660}
1661
1662/* writes to an analog output channel */
1663static int das1800_ao_winsn(struct comedi_device *dev,
1664			    struct comedi_subdevice *s,
1665			    struct comedi_insn *insn, unsigned int *data)
1666{
1667	int chan = CR_CHAN(insn->chanspec);
1668/* int range = CR_RANGE(insn->chanspec); */
1669	int update_chan = thisboard->ao_n_chan - 1;
1670	short output;
1671	unsigned long irq_flags;
1672
1673	/*   card expects two's complement data */
1674	output = data[0] - (1 << (thisboard->resolution - 1));
1675	/*  if the write is to the 'update' channel, we need to remember its value */
1676	if (chan == update_chan)
1677		devpriv->ao_update_bits = output;
1678	/*  write to channel */
1679	spin_lock_irqsave(&dev->spinlock, irq_flags);
1680	outb(DAC(chan), dev->iobase + DAS1800_SELECT);	/* select dac channel for baseAddress + 0x0 */
1681	outw(output, dev->iobase + DAS1800_DAC);
1682	/*  now we need to write to 'update' channel to update all dac channels */
1683	if (chan != update_chan) {
1684		outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);	/* select 'update' channel for baseAddress + 0x0 */
1685		outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1686	}
1687	spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1688
1689	return 1;
1690}
1691
1692/* reads from digital input channels */
1693static int das1800_di_rbits(struct comedi_device *dev,
1694			    struct comedi_subdevice *s,
1695			    struct comedi_insn *insn, unsigned int *data)
1696{
1697
1698	data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1699	data[0] = 0;
1700
1701	return 2;
1702}
1703
1704/* writes to digital output channels */
1705static int das1800_do_wbits(struct comedi_device *dev,
1706			    struct comedi_subdevice *s,
1707			    struct comedi_insn *insn, unsigned int *data)
1708{
1709	unsigned int wbits;
1710
1711	/*  only set bits that have been masked */
1712	data[0] &= (1 << s->n_chan) - 1;
1713	wbits = devpriv->do_bits;
1714	wbits &= ~data[0];
1715	wbits |= data[0] & data[1];
1716	devpriv->do_bits = wbits;
1717
1718	outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1719
1720	data[1] = devpriv->do_bits;
1721
1722	return 2;
1723}
1724
1725/* loads counters with divisor1, divisor2 from private structure */
1726static int das1800_set_frequency(struct comedi_device *dev)
1727{
1728	int err = 0;
1729
1730	/*  counter 1, mode 2 */
1731	if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1732		       2))
1733		err++;
1734	/*  counter 2, mode 2 */
1735	if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1736		       2))
1737		err++;
1738	if (err)
1739		return -1;
1740
1741	return 0;
1742}
1743
1744/* converts requested conversion timing to timing compatible with
1745 * hardware, used only when card is in 'burst mode'
1746 */
1747static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1748{
1749	unsigned int micro_sec;
1750
1751	/*  in burst mode, the maximum conversion time is 64 microseconds */
1752	if (convert_arg > 64000)
1753		convert_arg = 64000;
1754
1755	/*  the conversion time must be an integral number of microseconds */
1756	switch (round_mode) {
1757	case TRIG_ROUND_NEAREST:
1758	default:
1759		micro_sec = (convert_arg + 500) / 1000;
1760		break;
1761	case TRIG_ROUND_DOWN:
1762		micro_sec = convert_arg / 1000;
1763		break;
1764	case TRIG_ROUND_UP:
1765		micro_sec = (convert_arg - 1) / 1000 + 1;
1766		break;
1767	}
1768
1769	/*  return number of nanoseconds */
1770	return micro_sec * 1000;
1771}
1772
1773/* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1774static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
1775{
1776	unsigned int size = DMA_BUF_SIZE;
1777	static const int sample_size = 2;	/*  size in bytes of one sample from board */
1778	unsigned int fill_time = 300000000;	/*  target time in nanoseconds for filling dma buffer */
1779	unsigned int max_size;	/*  maximum size we will allow for a transfer */
1780
1781	/*  make dma buffer fill in 0.3 seconds for timed modes */
1782	switch (cmd->scan_begin_src) {
1783	case TRIG_FOLLOW:	/*  not in burst mode */
1784		if (cmd->convert_src == TRIG_TIMER)
1785			size = (fill_time / cmd->convert_arg) * sample_size;
1786		break;
1787	case TRIG_TIMER:
1788		size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1789		    sample_size;
1790		break;
1791	default:
1792		size = DMA_BUF_SIZE;
1793		break;
1794	}
1795
1796	/*  set a minimum and maximum size allowed */
1797	max_size = DMA_BUF_SIZE;
1798	/*  if we are taking limited number of conversions, limit transfer size to that */
1799	if (cmd->stop_src == TRIG_COUNT &&
1800	    cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1801		max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1802
1803	if (size > max_size)
1804		size = max_size;
1805	if (s

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