drivers/staging/comedi/drivers/ni_labpc.c

   1 /*
   2     comedi/drivers/ni_labpc.c
   3     Driver for National Instruments Lab-PC series boards and compatibles
   4     Copyright (C) 2001, 2002, 2003 Frank Mori Hess <fmhess@users.sourceforge.net>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 ************************************************************************
  21 */
  22 /*
  23 Driver: ni_labpc
  24 Description: National Instruments Lab-PC (& compatibles)
  25 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
  26 Devices: [National Instruments] Lab-PC-1200 (labpc-1200),
  27   Lab-PC-1200AI (labpc-1200ai), Lab-PC+ (lab-pc+), PCI-1200 (ni_labpc)
  28 Status: works
  29
  30 Tested with lab-pc-1200.  For the older Lab-PC+, not all input ranges
  31 and analog references will work, the available ranges/arefs will
  32 depend on how you have configured the jumpers on your board
  33 (see your owner's manual).
  34
  35 Kernel-level ISA plug-and-play support for the lab-pc-1200
  36 boards has not
  37 yet been added to the driver, mainly due to the fact that
  38 I don't know the device id numbers.  If you have one
  39 of these boards,
  40 please file a bug report at http://comedi.org/
  41 so I can get the necessary information from you.
  42
  43 The 1200 series boards have onboard calibration dacs for correcting
  44 analog input/output offsets and gains.  The proper settings for these
  45 caldacs are stored on the board's eeprom.  To read the caldac values
  46 from the eeprom and store them into a file that can be then be used by
  47 comedilib, use the comedi_calibrate program.
  48
  49 Configuration options - ISA boards:
  50   [0] - I/O port base address
  51   [1] - IRQ (optional, required for timed or externally triggered conversions)
  52   [2] - DMA channel (optional)
  53
  54 Configuration options - PCI boards:
  55   [0] - bus (optional)
  56   [1] - slot (optional)
  57
  58 The Lab-pc+ has quirky chanlist requirements
  59 when scanning multiple channels.  Multiple channel scan
  60 sequence must start at highest channel, then decrement down to
  61 channel 0.  The rest of the cards can scan down like lab-pc+ or scan
  62 up from channel zero.  Chanlists consisting of all one channel
  63 are also legal, and allow you to pace conversions in bursts.
  64
  65 */
  66
  67 /*
  68
  69 NI manuals:
  70 341309a (labpc-1200 register manual)
  71 340914a (pci-1200)
  72 320502b (lab-pc+)
  73
  74 */
  75
  76 #undef LABPC_DEBUG
  77 /* #define LABPC_DEBUG    enable debugging messages */
  78
  79 #include <linux/interrupt.h>
  80 #include <linux/slab.h>
  81 #include <linux/io.h>
  82 #include "../comedidev.h"
  83
  84 #include <linux/delay.h>
  85 #include <asm/dma.h>
  86
  87 #include "8253.h"
  88 #include "8255.h"
  89 #include "mite.h"
  90 #include "comedi_fc.h"
  91 #include "ni_labpc.h"
  92
  93 #define DRV_NAME "ni_labpc"
  94
  95 /* size of io region used by board */
  96 #define LABPC_SIZE           32
  97 /* 2 MHz master clock */
  98 #define LABPC_TIMER_BASE            500
  99
 100 /* Registers for the lab-pc+ */
 101
 102 /* write-only registers */
 103 #define COMMAND1_REG    0x0
 104 #define   ADC_GAIN_MASK (0x7 << 4)
 105 #define   ADC_CHAN_BITS(x)      ((x) & 0x7)
 106 /* enables multi channel scans */
 107 #define   ADC_SCAN_EN_BIT       0x80
 108 #define COMMAND2_REG    0x1
 109 /* enable pretriggering (used in conjunction with SWTRIG) */
 110 #define   PRETRIG_BIT   0x1
 111 /* enable paced conversions on external trigger */
 112 #define   HWTRIG_BIT    0x2
 113 /* enable paced conversions */
 114 #define   SWTRIG_BIT    0x4
 115 /* use two cascaded counters for pacing */
 116 #define   CASCADE_BIT   0x8
 117 #define   DAC_PACED_BIT(channel)        (0x40 << ((channel) & 0x1))
 118 #define COMMAND3_REG    0x2
 119 /* enable dma transfers */
 120 #define   DMA_EN_BIT    0x1
 121 /* enable interrupts for 8255 */
 122 #define   DIO_INTR_EN_BIT       0x2
 123 /* enable dma terminal count interrupt */
 124 #define   DMATC_INTR_EN_BIT     0x4
 125 /* enable timer interrupt */
 126 #define   TIMER_INTR_EN_BIT     0x8
 127 /* enable error interrupt */
 128 #define   ERR_INTR_EN_BIT       0x10
 129 /* enable fifo not empty interrupt */
 130 #define   ADC_FNE_INTR_EN_BIT   0x20
 131 #define ADC_CONVERT_REG 0x3
 132 #define DAC_LSB_REG(channel)    (0x4 + 2 * ((channel) & 0x1))
 133 #define DAC_MSB_REG(channel)    (0x5 + 2 * ((channel) & 0x1))
 134 #define ADC_CLEAR_REG   0x8
 135 #define DMATC_CLEAR_REG 0xa
 136 #define TIMER_CLEAR_REG 0xc
 137 /* 1200 boards only */
 138 #define COMMAND6_REG    0xe
 139 /* select ground or common-mode reference */
 140 #define   ADC_COMMON_BIT        0x1
 141 /*  adc unipolar */
 142 #define   ADC_UNIP_BIT  0x2
 143 /*  dac unipolar */
 144 #define   DAC_UNIP_BIT(channel) (0x4 << ((channel) & 0x1))
 145 /* enable fifo half full interrupt */
 146 #define   ADC_FHF_INTR_EN_BIT   0x20
 147 /* enable interrupt on end of hardware count */
 148 #define   A1_INTR_EN_BIT        0x40
 149 /* scan up from channel zero instead of down to zero */
 150 #define   ADC_SCAN_UP_BIT 0x80
 151 #define COMMAND4_REG    0xf
 152 /* enables 'interval' scanning */
 153 #define   INTERVAL_SCAN_EN_BIT  0x1
 154 /* enables external signal on counter b1 output to trigger scan */
 155 #define   EXT_SCAN_EN_BIT       0x2
 156 /* chooses direction (output or input) for EXTCONV* line */
 157 #define   EXT_CONVERT_OUT_BIT   0x4
 158 /* chooses differential inputs for adc (in conjunction with board jumper) */
 159 #define   ADC_DIFF_BIT  0x8
 160 #define   EXT_CONVERT_DISABLE_BIT       0x10
 161 /* 1200 boards only, calibration stuff */
 162 #define COMMAND5_REG    0x1c
 163 /* enable eeprom for write */
 164 #define   EEPROM_WRITE_UNPROTECT_BIT    0x4
 165 /* enable dithering */
 166 #define   DITHER_EN_BIT 0x8
 167 /* load calibration dac */
 168 #define   CALDAC_LOAD_BIT       0x10
 169 /* serial clock - rising edge writes, falling edge reads */
 170 #define   SCLOCK_BIT    0x20
 171 /* serial data bit for writing to eeprom or calibration dacs */
 172 #define   SDATA_BIT     0x40
 173 /* enable eeprom for read/write */
 174 #define   EEPROM_EN_BIT 0x80
 175 #define INTERVAL_COUNT_REG      0x1e
 176 #define INTERVAL_LOAD_REG       0x1f
 177 #define   INTERVAL_LOAD_BITS    0x1
 178
 179 /* read-only registers */
 180 #define STATUS1_REG     0x0
 181 /* data is available in fifo */
 182 #define   DATA_AVAIL_BIT        0x1
 183 /* overrun has occurred */
 184 #define   OVERRUN_BIT   0x2
 185 /* fifo overflow */
 186 #define   OVERFLOW_BIT  0x4
 187 /* timer interrupt has occurred */
 188 #define   TIMER_BIT     0x8
 189 /* dma terminal count has occurred */
 190 #define   DMATC_BIT     0x10
 191 /* external trigger has occurred */
 192 #define   EXT_TRIG_BIT  0x40
 193 /* 1200 boards only */
 194 #define STATUS2_REG     0x1d
 195 /* programmable eeprom serial output */
 196 #define   EEPROM_OUT_BIT        0x1
 197 /* counter A1 terminal count */
 198 #define   A1_TC_BIT     0x2
 199 /* fifo not half full */
 200 #define   FNHF_BIT      0x4
 201 #define ADC_FIFO_REG    0xa
 202
 203 #define DIO_BASE_REG    0x10
 204 #define COUNTER_A_BASE_REG      0x14
 205 #define COUNTER_A_CONTROL_REG   (COUNTER_A_BASE_REG + 0x3)
 206 /* check modes put conversion pacer output in harmless state (a0 mode 2) */
 207 #define   INIT_A0_BITS  0x14
 208 /* put hardware conversion counter output in harmless state (a1 mode 0) */
 209 #define   INIT_A1_BITS  0x70
 210 #define COUNTER_B_BASE_REG      0x18
 211
 212 static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it);
 213 static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
 214 static irqreturn_t labpc_interrupt(int irq, void *d);
 215 static int labpc_drain_fifo(struct comedi_device *dev);
 216 #ifdef CONFIG_ISA_DMA_API
 217 static void labpc_drain_dma(struct comedi_device *dev);
 218 static void handle_isa_dma(struct comedi_device *dev);
 219 #endif
 220 static void labpc_drain_dregs(struct comedi_device *dev);
 221 static int labpc_ai_cmdtest(struct comedi_device *dev,
 222                             struct comedi_subdevice *s, struct comedi_cmd *cmd);
 223 static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
 224 static int labpc_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 225                           struct comedi_insn *insn, unsigned int *data);
 226 static int labpc_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
 227                           struct comedi_insn *insn, unsigned int *data);
 228 static int labpc_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
 229                           struct comedi_insn *insn, unsigned int *data);
 230 static int labpc_calib_read_insn(struct comedi_device *dev,
 231                                  struct comedi_subdevice *s,
 232                                  struct comedi_insn *insn, unsigned int *data);
 233 static int labpc_calib_write_insn(struct comedi_device *dev,
 234                                   struct comedi_subdevice *s,
 235                                   struct comedi_insn *insn, unsigned int *data);
 236 static int labpc_eeprom_read_insn(struct comedi_device *dev,
 237                                   struct comedi_subdevice *s,
 238                                   struct comedi_insn *insn, unsigned int *data);
 239 static int labpc_eeprom_write_insn(struct comedi_device *dev,
 240                                    struct comedi_subdevice *s,
 241                                    struct comedi_insn *insn,
 242                                    unsigned int *data);
 243 static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd);
 244 #ifdef CONFIG_COMEDI_PCI
 245 static unsigned int labpc_suggest_transfer_size(struct comedi_cmd cmd);
 246 static int labpc_find_device(struct comedi_device *dev, int bus, int slot);
 247 #endif
 248 static int labpc_dio_mem_callback(int dir, int port, int data,
 249                                   unsigned long arg);
 250 static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
 251                              unsigned int num_bits);
 252 static unsigned int labpc_serial_in(struct comedi_device *dev);
 253 static unsigned int labpc_eeprom_read(struct comedi_device *dev,
 254                                       unsigned int address);
 255 static unsigned int labpc_eeprom_read_status(struct comedi_device *dev);
 256 static int labpc_eeprom_write(struct comedi_device *dev,
 257                                        unsigned int address,
 258                                        unsigned int value);
 259 static void write_caldac(struct comedi_device *dev, unsigned int channel,
 260                          unsigned int value);
 261
 262 enum scan_mode {
 263         MODE_SINGLE_CHAN,
 264         MODE_SINGLE_CHAN_INTERVAL,
 265         MODE_MULT_CHAN_UP,
 266         MODE_MULT_CHAN_DOWN,
 267 };
 268
 269 /* analog input ranges */
 270 #define NUM_LABPC_PLUS_AI_RANGES 16
 271 /* indicates unipolar ranges */
 272 static const int labpc_plus_is_unipolar[NUM_LABPC_PLUS_AI_RANGES] = {
 273         0,
 274         0,
 275         0,
 276         0,
 277         0,
 278         0,
 279         0,
 280         0,
 281         1,
 282         1,
 283         1,
 284         1,
 285         1,
 286         1,
 287         1,
 288         1,
 289 };
 290
 291 /* map range index to gain bits */
 292 static const int labpc_plus_ai_gain_bits[NUM_LABPC_PLUS_AI_RANGES] = {
 293         0x00,
 294         0x10,
 295         0x20,
 296         0x30,
 297         0x40,
 298         0x50,
 299         0x60,
 300         0x70,
 301         0x00,
 302         0x10,
 303         0x20,
 304         0x30,
 305         0x40,
 306         0x50,
 307         0x60,
 308         0x70,
 309 };
 310
 311 static const struct comedi_lrange range_labpc_plus_ai = {
 312         NUM_LABPC_PLUS_AI_RANGES,
 313         {
 314          BIP_RANGE(5),
 315          BIP_RANGE(4),
 316          BIP_RANGE(2.5),
 317          BIP_RANGE(1),
 318          BIP_RANGE(0.5),
 319          BIP_RANGE(0.25),
 320          BIP_RANGE(0.1),
 321          BIP_RANGE(0.05),
 322          UNI_RANGE(10),
 323          UNI_RANGE(8),
 324          UNI_RANGE(5),
 325          UNI_RANGE(2),
 326          UNI_RANGE(1),
 327          UNI_RANGE(0.5),
 328          UNI_RANGE(0.2),
 329          UNI_RANGE(0.1),
 330          }
 331 };
 332
 333 #define NUM_LABPC_1200_AI_RANGES 14
 334 /* indicates unipolar ranges */
 335 const int labpc_1200_is_unipolar[NUM_LABPC_1200_AI_RANGES] = {
 336         0,
 337         0,
 338         0,
 339         0,
 340         0,
 341         0,
 342         0,
 343         1,
 344         1,
 345         1,
 346         1,
 347         1,
 348         1,
 349         1,
 350 };
 351 EXPORT_SYMBOL_GPL(labpc_1200_is_unipolar);
 352
 353 /* map range index to gain bits */
 354 const int labpc_1200_ai_gain_bits[NUM_LABPC_1200_AI_RANGES] = {
 355         0x00,
 356         0x20,
 357         0x30,
 358         0x40,
 359         0x50,
 360         0x60,
 361         0x70,
 362         0x00,
 363         0x20,
 364         0x30,
 365         0x40,
 366         0x50,
 367         0x60,
 368         0x70,
 369 };
 370 EXPORT_SYMBOL_GPL(labpc_1200_ai_gain_bits);
 371
 372 const struct comedi_lrange range_labpc_1200_ai = {
 373         NUM_LABPC_1200_AI_RANGES,
 374         {
 375          BIP_RANGE(5),
 376          BIP_RANGE(2.5),
 377          BIP_RANGE(1),
 378          BIP_RANGE(0.5),
 379          BIP_RANGE(0.25),
 380          BIP_RANGE(0.1),
 381          BIP_RANGE(0.05),
 382          UNI_RANGE(10),
 383          UNI_RANGE(5),
 384          UNI_RANGE(2),
 385          UNI_RANGE(1),
 386          UNI_RANGE(0.5),
 387          UNI_RANGE(0.2),
 388          UNI_RANGE(0.1),
 389          }
 390 };
 391 EXPORT_SYMBOL_GPL(range_labpc_1200_ai);
 392
 393 /* analog output ranges */
 394 #define AO_RANGE_IS_UNIPOLAR 0x1
 395 static const struct comedi_lrange range_labpc_ao = {
 396         2,
 397         {
 398          BIP_RANGE(5),
 399          UNI_RANGE(10),
 400          }
 401 };
 402
 403 /* functions that do inb/outb and readb/writeb so we can use
 404  * function pointers to decide which to use */
 405 static inline unsigned int labpc_inb(unsigned long address)
 406 {
 407         return inb(address);
 408 }
 409
 410 static inline void labpc_outb(unsigned int byte, unsigned long address)
 411 {
 412         outb(byte, address);
 413 }
 414
 415 static inline unsigned int labpc_readb(unsigned long address)
 416 {
 417         return readb((void *)address);
 418 }
 419
 420 static inline void labpc_writeb(unsigned int byte, unsigned long address)
 421 {
 422         writeb(byte, (void *)address);
 423 }
 424
 425 static const struct labpc_board_struct labpc_boards[] = {
 426         {
 427          .name = "lab-pc-1200",
 428          .ai_speed = 10000,
 429          .bustype = isa_bustype,
 430          .register_layout = labpc_1200_layout,
 431          .has_ao = 1,
 432          .ai_range_table = &range_labpc_1200_ai,
 433          .ai_range_code = labpc_1200_ai_gain_bits,
 434          .ai_range_is_unipolar = labpc_1200_is_unipolar,
 435          .ai_scan_up = 1,
 436          .memory_mapped_io = 0,
 437          },
 438         {
 439          .name = "lab-pc-1200ai",
 440          .ai_speed = 10000,
 441          .bustype = isa_bustype,
 442          .register_layout = labpc_1200_layout,
 443          .has_ao = 0,
 444          .ai_range_table = &range_labpc_1200_ai,
 445          .ai_range_code = labpc_1200_ai_gain_bits,
 446          .ai_range_is_unipolar = labpc_1200_is_unipolar,
 447          .ai_scan_up = 1,
 448          .memory_mapped_io = 0,
 449          },
 450         {
 451          .name = "lab-pc+",
 452          .ai_speed = 12000,
 453          .bustype = isa_bustype,
 454          .register_layout = labpc_plus_layout,
 455          .has_ao = 1,
 456          .ai_range_table = &range_labpc_plus_ai,
 457          .ai_range_code = labpc_plus_ai_gain_bits,
 458          .ai_range_is_unipolar = labpc_plus_is_unipolar,
 459          .ai_scan_up = 0,
 460          .memory_mapped_io = 0,
 461          },
 462 #ifdef CONFIG_COMEDI_PCI
 463         {
 464          .name = "pci-1200",
 465          .device_id = 0x161,
 466          .ai_speed = 10000,
 467          .bustype = pci_bustype,
 468          .register_layout = labpc_1200_layout,
 469          .has_ao = 1,
 470          .ai_range_table = &range_labpc_1200_ai,
 471          .ai_range_code = labpc_1200_ai_gain_bits,
 472          .ai_range_is_unipolar = labpc_1200_is_unipolar,
 473          .ai_scan_up = 1,
 474          .memory_mapped_io = 1,
 475          },
 476 /* dummy entry so pci board works when comedi_config is passed driver name */
 477         {
 478          .name = DRV_NAME,
 479          .bustype = pci_bustype,
 480          },
 481 #endif
 482 };
 483
 484 /*
 485  * Useful for shorthand access to the particular board structure
 486  */
 487 #define thisboard ((struct labpc_board_struct *)dev->board_ptr)
 488
 489 /* size in bytes of dma buffer */
 490 static const int dma_buffer_size = 0xff00;
 491 /* 2 bytes per sample */
 492 static const int sample_size = 2;
 493
 494 #define devpriv ((struct labpc_private *)dev->private)
 495
 496 static struct comedi_driver driver_labpc = {
 497         .driver_name = DRV_NAME,
 498         .module = THIS_MODULE,
 499         .attach = labpc_attach,
 500         .detach = labpc_common_detach,
 501         .num_names = ARRAY_SIZE(labpc_boards),
 502         .board_name = &labpc_boards[0].name,
 503         .offset = sizeof(struct labpc_board_struct),
 504 };
 505
 506 #ifdef CONFIG_COMEDI_PCI
 507 static DEFINE_PCI_DEVICE_TABLE(labpc_pci_table) = {
 508         {PCI_DEVICE(PCI_VENDOR_ID_NI, 0x161)},
 509         {0}
 510 };
 511
 512 MODULE_DEVICE_TABLE(pci, labpc_pci_table);
 513 #endif /* CONFIG_COMEDI_PCI */
 514
 515 static inline int labpc_counter_load(struct comedi_device *dev,
 516                                      unsigned long base_address,
 517                                      unsigned int counter_number,
 518                                      unsigned int count, unsigned int mode)
 519 {
 520         if (thisboard->memory_mapped_io)
 521                 return i8254_mm_load((void *)base_address, 0, counter_number,
 522                                      count, mode);
 523         else
 524                 return i8254_load(base_address, 0, counter_number, count, mode);
 525 }
 526
 527 int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
 528                         unsigned int irq, unsigned int dma_chan)
 529 {
 530         struct comedi_subdevice *s;
 531         int i;
 532         unsigned long isr_flags;
 533 #ifdef CONFIG_ISA_DMA_API
 534         unsigned long dma_flags;
 535 #endif
 536         short lsb, msb;
 537
 538         printk(KERN_ERR "comedi%d: ni_labpc: %s, io 0x%lx", dev->minor,
 539                                                                 thisboard->name,
 540                iobase);
 541         if (irq)
 542                 printk(", irq %u", irq);
 543         if (dma_chan)
 544                 printk(", dma %u", dma_chan);
 545         printk("\n");
 546
 547         if (iobase == 0) {
 548                 printk(KERN_ERR "io base address is zero!\n");
 549                 return -EINVAL;
 550         }
 551         /*  request io regions for isa boards */
 552         if (thisboard->bustype == isa_bustype) {
 553                 /* check if io addresses are available */
 554                 if (!request_region(iobase, LABPC_SIZE,
 555                                     driver_labpc.driver_name)) {
 556                         printk(KERN_ERR "I/O port conflict\n");
 557                         return -EIO;
 558                 }
 559         }
 560         dev->iobase = iobase;
 561
 562         if (thisboard->memory_mapped_io) {
 563                 devpriv->read_byte = labpc_readb;
 564                 devpriv->write_byte = labpc_writeb;
 565         } else {
 566                 devpriv->read_byte = labpc_inb;
 567                 devpriv->write_byte = labpc_outb;
 568         }
 569         /* initialize board's command registers */
 570         devpriv->write_byte(devpriv->command1_bits, dev->iobase + COMMAND1_REG);
 571         devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
 572         devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
 573         devpriv->write_byte(devpriv->command4_bits, dev->iobase + COMMAND4_REG);
 574         if (thisboard->register_layout == labpc_1200_layout) {
 575                 devpriv->write_byte(devpriv->command5_bits,
 576                                     dev->iobase + COMMAND5_REG);
 577                 devpriv->write_byte(devpriv->command6_bits,
 578                                     dev->iobase + COMMAND6_REG);
 579         }
 580
 581         /* grab our IRQ */
 582         if (irq) {
 583                 isr_flags = 0;
 584                 if (thisboard->bustype == pci_bustype
 585                     || thisboard->bustype == pcmcia_bustype)
 586                         isr_flags |= IRQF_SHARED;
 587                 if (request_irq(irq, labpc_interrupt, isr_flags,
 588                                 driver_labpc.driver_name, dev)) {
 589                         printk(KERN_ERR "unable to allocate irq %u\n", irq);
 590                         return -EINVAL;
 591                 }
 592         }
 593         dev->irq = irq;
 594
 595 #ifdef CONFIG_ISA_DMA_API
 596         /* grab dma channel */
 597         if (dma_chan > 3) {
 598                 printk(KERN_ERR " invalid dma channel %u\n", dma_chan);
 599                 return -EINVAL;
 600         } else if (dma_chan) {
 601                 /* allocate dma buffer */
 602                 devpriv->dma_buffer =
 603                     kmalloc(dma_buffer_size, GFP_KERNEL | GFP_DMA);
 604                 if (devpriv->dma_buffer == NULL) {
 605                         printk(KERN_ERR " failed to allocate dma buffer\n");
 606                         return -ENOMEM;
 607                 }
 608                 if (request_dma(dma_chan, driver_labpc.driver_name)) {
 609                         printk(KERN_ERR " failed to allocate dma channel %u\n",
 610                                dma_chan);
 611                         return -EINVAL;
 612                 }
 613                 devpriv->dma_chan = dma_chan;
 614                 dma_flags = claim_dma_lock();
 615                 disable_dma(devpriv->dma_chan);
 616                 set_dma_mode(devpriv->dma_chan, DMA_MODE_READ);
 617                 release_dma_lock(dma_flags);
 618         }
 619 #endif
 620
 621         dev->board_name = thisboard->name;
 622
 623         if (alloc_subdevices(dev, 5) < 0)
 624                 return -ENOMEM;
 625
 626         /* analog input subdevice */
 627         s = dev->subdevices + 0;
 628         dev->read_subdev = s;
 629         s->type = COMEDI_SUBD_AI;
 630         s->subdev_flags =
 631             SDF_READABLE | SDF_GROUND | SDF_COMMON | SDF_DIFF | SDF_CMD_READ;
 632         s->n_chan = 8;
 633         s->len_chanlist = 8;
 634         s->maxdata = (1 << 12) - 1;     /* 12 bit resolution */
 635         s->range_table = thisboard->ai_range_table;
 636         s->do_cmd = labpc_ai_cmd;
 637         s->do_cmdtest = labpc_ai_cmdtest;
 638         s->insn_read = labpc_ai_rinsn;
 639         s->cancel = labpc_cancel;
 640
 641         /* analog output */
 642         s = dev->subdevices + 1;
 643         if (thisboard->has_ao) {
 644                 /*
 645                  * Could provide command support, except it only has a
 646                  * one sample hardware buffer for analog output and no
 647                  * underrun flag.
 648                  */
 649                 s->type = COMEDI_SUBD_AO;
 650                 s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_GROUND;
 651                 s->n_chan = NUM_AO_CHAN;
 652                 s->maxdata = (1 << 12) - 1;     /*  12 bit resolution */
 653                 s->range_table = &range_labpc_ao;
 654                 s->insn_read = labpc_ao_rinsn;
 655                 s->insn_write = labpc_ao_winsn;
 656                 /* initialize analog outputs to a known value */
 657                 for (i = 0; i < s->n_chan; i++) {
 658                         devpriv->ao_value[i] = s->maxdata / 2;
 659                         lsb = devpriv->ao_value[i] & 0xff;
 660                         msb = (devpriv->ao_value[i] >> 8) & 0xff;
 661                         devpriv->write_byte(lsb, dev->iobase + DAC_LSB_REG(i));
 662                         devpriv->write_byte(msb, dev->iobase + DAC_MSB_REG(i));
 663                 }
 664         } else {
 665                 s->type = COMEDI_SUBD_UNUSED;
 666         }
 667
 668         /* 8255 dio */
 669         s = dev->subdevices + 2;
 670         /*  if board uses io memory we have to give a custom callback
 671          * function to the 8255 driver */
 672         if (thisboard->memory_mapped_io)
 673                 subdev_8255_init(dev, s, labpc_dio_mem_callback,
 674                                  (unsigned long)(dev->iobase + DIO_BASE_REG));
 675         else
 676                 subdev_8255_init(dev, s, NULL, dev->iobase + DIO_BASE_REG);
 677
 678         /*  calibration subdevices for boards that have one */
 679         s = dev->subdevices + 3;
 680         if (thisboard->register_layout == labpc_1200_layout) {
 681                 s->type = COMEDI_SUBD_CALIB;
 682                 s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
 683                 s->n_chan = 16;
 684                 s->maxdata = 0xff;
 685                 s->insn_read = labpc_calib_read_insn;
 686                 s->insn_write = labpc_calib_write_insn;
 687
 688                 for (i = 0; i < s->n_chan; i++)
 689                         write_caldac(dev, i, s->maxdata / 2);
 690         } else
 691                 s->type = COMEDI_SUBD_UNUSED;
 692
 693         /* EEPROM */
 694         s = dev->subdevices + 4;
 695         if (thisboard->register_layout == labpc_1200_layout) {
 696                 s->type = COMEDI_SUBD_MEMORY;
 697                 s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
 698                 s->n_chan = EEPROM_SIZE;
 699                 s->maxdata = 0xff;
 700                 s->insn_read = labpc_eeprom_read_insn;
 701                 s->insn_write = labpc_eeprom_write_insn;
 702
 703                 for (i = 0; i < EEPROM_SIZE; i++)
 704                         devpriv->eeprom_data[i] = labpc_eeprom_read(dev, i);
 705 #ifdef LABPC_DEBUG
 706                 printk(KERN_ERR " eeprom:");
 707                 for (i = 0; i < EEPROM_SIZE; i++)
 708                         printk(" %i:0x%x ", i, devpriv->eeprom_data[i]);
 709                 printk("\n");
 710 #endif
 711         } else
 712                 s->type = COMEDI_SUBD_UNUSED;
 713
 714         return 0;
 715 }
 716 EXPORT_SYMBOL_GPL(labpc_common_attach);
 717
 718 static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 719 {
 720         unsigned long iobase = 0;
 721         unsigned int irq = 0;
 722         unsigned int dma_chan = 0;
 723 #ifdef CONFIG_COMEDI_PCI
 724         int retval;
 725 #endif
 726
 727         /* allocate and initialize dev->private */
 728         if (alloc_private(dev, sizeof(struct labpc_private)) < 0)
 729                 return -ENOMEM;
 730
 731         /* get base address, irq etc. based on bustype */
 732         switch (thisboard->bustype) {
 733         case isa_bustype:
 734 #ifdef CONFIG_ISA_DMA_API
 735                 iobase = it->options[0];
 736                 irq = it->options[1];
 737                 dma_chan = it->options[2];
 738 #else
 739                 printk(KERN_ERR " this driver has not been built with ISA DMA "
 740                                                                 "support.\n");
 741                 return -EINVAL;
 742 #endif
 743                 break;
 744         case pci_bustype:
 745 #ifdef CONFIG_COMEDI_PCI
 746                 retval = labpc_find_device(dev, it->options[0], it->options[1]);
 747                 if (retval < 0)
 748                         return retval;
 749                 retval = mite_setup(devpriv->mite);
 750                 if (retval < 0)
 751                         return retval;
 752                 iobase = (unsigned long)devpriv->mite->daq_io_addr;
 753                 irq = mite_irq(devpriv->mite);
 754 #else
 755                 printk(KERN_ERR " this driver has not been built with PCI "
 756                                                                 "support.\n");
 757                 return -EINVAL;
 758 #endif
 759                 break;
 760         case pcmcia_bustype:
 761                 printk
 762                     (" this driver does not support pcmcia cards, use ni_labpc_cs.o\n");
 763                 return -EINVAL;
 764                 break;
 765         default:
 766                 printk(KERN_ERR "bug! couldn't determine board type\n");
 767                 return -EINVAL;
 768                 break;
 769         }
 770
 771         return labpc_common_attach(dev, iobase, irq, dma_chan);
 772 }
 773
 774 /* adapted from ni_pcimio for finding mite based boards (pc-1200) */
 775 #ifdef CONFIG_COMEDI_PCI
 776 static int labpc_find_device(struct comedi_device *dev, int bus, int slot)
 777 {
 778         struct mite_struct *mite;
 779         int i;
 780         for (mite = mite_devices; mite; mite = mite->next) {
 781                 if (mite->used)
 782                         continue;
 783 /* if bus/slot are specified then make sure we have the right bus/slot */
 784                 if (bus || slot) {
 785                         if (bus != mite->pcidev->bus->number
 786                             || slot != PCI_SLOT(mite->pcidev->devfn))
 787                                 continue;
 788                 }
 789                 for (i = 0; i < driver_labpc.num_names; i++) {
 790                         if (labpc_boards[i].bustype != pci_bustype)
 791                                 continue;
 792                         if (mite_device_id(mite) == labpc_boards[i].device_id) {
 793                                 devpriv->mite = mite;
 794 /* fixup board pointer, in case we were using the dummy "ni_labpc" entry */
 795                                 dev->board_ptr = &labpc_boards[i];
 796                                 return 0;
 797                         }
 798                 }
 799         }
 800         printk(KERN_ERR "no device found\n");
 801         mite_list_devices();
 802         return -EIO;
 803 }
 804 #endif
 805
 806 int labpc_common_detach(struct comedi_device *dev)
 807 {
 808         printk(KERN_ERR "comedi%d: ni_labpc: detach\n", dev->minor);
 809
 810         if (dev->subdevices)
 811                 subdev_8255_cleanup(dev, dev->subdevices + 2);
 812
 813 #ifdef CONFIG_ISA_DMA_API
 814         /* only free stuff if it has been allocated by _attach */
 815         kfree(devpriv->dma_buffer);
 816         if (devpriv->dma_chan)
 817                 free_dma(devpriv->dma_chan);
 818 #endif
 819         if (dev->irq)
 820                 free_irq(dev->irq, dev);
 821         if (thisboard->bustype == isa_bustype && dev->iobase)
 822                 release_region(dev->iobase, LABPC_SIZE);
 823 #ifdef CONFIG_COMEDI_PCI
 824         if (devpriv->mite)
 825                 mite_unsetup(devpriv->mite);
 826 #endif
 827
 828         return 0;
 829 };
 830 EXPORT_SYMBOL_GPL(labpc_common_detach);
 831
 832 static void labpc_clear_adc_fifo(const struct comedi_device *dev)
 833 {
 834         devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG);
 835         devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
 836         devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
 837 }
 838
 839 static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 840 {
 841         unsigned long flags;
 842
 843         spin_lock_irqsave(&dev->spinlock, flags);
 844         devpriv->command2_bits &= ~SWTRIG_BIT & ~HWTRIG_BIT & ~PRETRIG_BIT;
 845         devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
 846         spin_unlock_irqrestore(&dev->spinlock, flags);
 847
 848         devpriv->command3_bits = 0;
 849         devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
 850
 851         return 0;
 852 }
 853
 854 static enum scan_mode labpc_ai_scan_mode(const struct comedi_cmd *cmd)
 855 {
 856         if (cmd->chanlist_len == 1)
 857                 return MODE_SINGLE_CHAN;
 858
 859         /* chanlist may be NULL during cmdtest. */
 860         if (cmd->chanlist == NULL)
 861                 return MODE_MULT_CHAN_UP;
 862
 863         if (CR_CHAN(cmd->chanlist[0]) == CR_CHAN(cmd->chanlist[1]))
 864                 return MODE_SINGLE_CHAN_INTERVAL;
 865
 866         if (CR_CHAN(cmd->chanlist[0]) < CR_CHAN(cmd->chanlist[1]))
 867                 return MODE_MULT_CHAN_UP;
 868
 869         if (CR_CHAN(cmd->chanlist[0]) > CR_CHAN(cmd->chanlist[1]))
 870                 return MODE_MULT_CHAN_DOWN;
 871
 872         printk(KERN_ERR "ni_labpc: bug! this should never happen\n");
 873
 874         return 0;
 875 }
 876
 877 static int labpc_ai_chanlist_invalid(const struct comedi_device *dev,
 878                                      const struct comedi_cmd *cmd)
 879 {
 880         int mode, channel, range, aref, i;
 881
 882         if (cmd->chanlist == NULL)
 883                 return 0;
 884
 885         mode = labpc_ai_scan_mode(cmd);
 886
 887         if (mode == MODE_SINGLE_CHAN)
 888                 return 0;
 889
 890         if (mode == MODE_SINGLE_CHAN_INTERVAL) {
 891                 if (cmd->chanlist_len > 0xff) {
 892                         comedi_error(dev,
 893                                      "ni_labpc: chanlist too long for single channel interval mode\n");
 894                         return 1;
 895                 }
 896         }
 897
 898         channel = CR_CHAN(cmd->chanlist[0]);
 899         range = CR_RANGE(cmd->chanlist[0]);
 900         aref = CR_AREF(cmd->chanlist[0]);
 901
 902         for (i = 0; i < cmd->chanlist_len; i++) {
 903
 904                 switch (mode) {
 905                 case MODE_SINGLE_CHAN_INTERVAL:
 906                         if (CR_CHAN(cmd->chanlist[i]) != channel) {
 907                                 comedi_error(dev,
 908                                              "channel scanning order specified in chanlist is not supported by hardware.\n");
 909                                 return 1;
 910                         }
 911                         break;
 912                 case MODE_MULT_CHAN_UP:
 913                         if (CR_CHAN(cmd->chanlist[i]) != i) {
 914                                 comedi_error(dev,
 915                                              "channel scanning order specified in chanlist is not supported by hardware.\n");
 916                                 return 1;
 917                         }
 918                         break;
 919                 case MODE_MULT_CHAN_DOWN:
 920                         if (CR_CHAN(cmd->chanlist[i]) !=
 921                             cmd->chanlist_len - i - 1) {
 922                                 comedi_error(dev,
 923                                              "channel scanning order specified in chanlist is not supported by hardware.\n");
 924                                 return 1;
 925                         }
 926                         break;
 927                 default:
 928                         printk(KERN_ERR "ni_labpc: bug! in chanlist check\n");
 929                         return 1;
 930                         break;
 931                 }
 932
 933                 if (CR_RANGE(cmd->chanlist[i]) != range) {
 934                         comedi_error(dev,
 935                                      "entries in chanlist must all have the same range\n");
 936                         return 1;
 937                 }
 938
 939                 if (CR_AREF(cmd->chanlist[i]) != aref) {
 940                         comedi_error(dev,
 941                                      "entries in chanlist must all have the same reference\n");
 942                         return 1;
 943                 }
 944         }
 945
 946         return 0;
 947 }
 948
 949 static int labpc_use_continuous_mode(const struct comedi_cmd *cmd)
 950 {
 951         if (labpc_ai_scan_mode(cmd) == MODE_SINGLE_CHAN)
 952                 return 1;
 953
 954         if (cmd->scan_begin_src == TRIG_FOLLOW)
 955                 return 1;
 956
 957         return 0;
 958 }
 959
 960 static unsigned int labpc_ai_convert_period(const struct comedi_cmd *cmd)
 961 {
 962         if (cmd->convert_src != TRIG_TIMER)
 963                 return 0;
 964
 965         if (labpc_ai_scan_mode(cmd) == MODE_SINGLE_CHAN &&
 966             cmd->scan_begin_src == TRIG_TIMER)
 967                 return cmd->scan_begin_arg;
 968
 969         return cmd->convert_arg;
 970 }
 971
 972 static void labpc_set_ai_convert_period(struct comedi_cmd *cmd, unsigned int ns)
 973 {
 974         if (cmd->convert_src != TRIG_TIMER)
 975                 return;
 976
 977         if (labpc_ai_scan_mode(cmd) == MODE_SINGLE_CHAN &&
 978             cmd->scan_begin_src == TRIG_TIMER) {
 979                 cmd->scan_begin_arg = ns;
 980                 if (cmd->convert_arg > cmd->scan_begin_arg)
 981                         cmd->convert_arg = cmd->scan_begin_arg;
 982         } else
 983                 cmd->convert_arg = ns;
 984 }
 985
 986 static unsigned int labpc_ai_scan_period(const struct comedi_cmd *cmd)
 987 {
 988         if (cmd->scan_begin_src != TRIG_TIMER)
 989                 return 0;
 990
 991         if (labpc_ai_scan_mode(cmd) == MODE_SINGLE_CHAN &&
 992             cmd->convert_src == TRIG_TIMER)
 993                 return 0;
 994
 995         return cmd->scan_begin_arg;
 996 }
 997
 998 static void labpc_set_ai_scan_period(struct comedi_cmd *cmd, unsigned int ns)
 999 {
1000         if (cmd->scan_begin_src != TRIG_TIMER)
1001                 return;
1002
1003         if (labpc_ai_scan_mode(cmd) == MODE_SINGLE_CHAN &&
1004             cmd->convert_src == TRIG_TIMER)
1005                 return;
1006
1007         cmd->scan_begin_arg = ns;
1008 }
1009
1010 static int labpc_ai_cmdtest(struct comedi_device *dev,
1011                             struct comedi_subdevice *s, struct comedi_cmd *cmd)
1012 {
1013         int err = 0;
1014         int tmp, tmp2;
1015         int stop_mask;
1016
1017         /* step 1: make sure trigger sources are trivially valid */
1018
1019         tmp = cmd->start_src;
1020         cmd->start_src &= TRIG_NOW | TRIG_EXT;
1021         if (!cmd->start_src || tmp != cmd->start_src)
1022                 err++;
1023
1024         tmp = cmd->scan_begin_src;
1025         cmd->scan_begin_src &= TRIG_TIMER | TRIG_FOLLOW | TRIG_EXT;
1026         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1027                 err++;
1028
1029         tmp = cmd->convert_src;
1030         cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1031         if (!cmd->convert_src || tmp != cmd->convert_src)
1032                 err++;
1033
1034         tmp = cmd->scan_end_src;
1035         cmd->scan_end_src &= TRIG_COUNT;
1036         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1037                 err++;
1038
1039         tmp = cmd->stop_src;
1040         stop_mask = TRIG_COUNT | TRIG_NONE;
1041         if (thisboard->register_layout == labpc_1200_layout)
1042                 stop_mask |= TRIG_EXT;
1043         cmd->stop_src &= stop_mask;
1044         if (!cmd->stop_src || tmp != cmd->stop_src)
1045                 err++;
1046
1047         if (err)
1048                 return 1;
1049
1050         /* step 2: make sure trigger sources are unique and mutually compatible */
1051
1052         if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1053                 err++;
1054         if (cmd->scan_begin_src != TRIG_TIMER &&
1055             cmd->scan_begin_src != TRIG_FOLLOW &&
1056             cmd->scan_begin_src != TRIG_EXT)
1057                 err++;
1058         if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1059                 err++;
1060         if (cmd->stop_src != TRIG_COUNT &&
1061             cmd->stop_src != TRIG_EXT && cmd->stop_src != TRIG_NONE)
1062                 err++;
1063
1064         /* can't have external stop and start triggers at once */
1065         if (cmd->start_src == TRIG_EXT && cmd->stop_src == TRIG_EXT)
1066                 err++;
1067
1068         if (err)
1069                 return 2;
1070
1071         /* step 3: make sure arguments are trivially compatible */
1072
1073         if (cmd->start_arg == TRIG_NOW && cmd->start_arg != 0) {
1074                 cmd->start_arg = 0;
1075                 err++;
1076         }
1077
1078         if (!cmd->chanlist_len)
1079                 err++;
1080
1081         if (cmd->scan_end_arg != cmd->chanlist_len) {
1082                 cmd->scan_end_arg = cmd->chanlist_len;
1083                 err++;
1084         }
1085
1086         if (cmd->convert_src == TRIG_TIMER) {
1087                 if (cmd->convert_arg < thisboard->ai_speed) {
1088                         cmd->convert_arg = thisboard->ai_speed;
1089                         err++;
1090                 }
1091         }
1092         /* make sure scan timing is not too fast */
1093         if (cmd->scan_begin_src == TRIG_TIMER) {
1094                 if (cmd->convert_src == TRIG_TIMER &&
1095                     cmd->scan_begin_arg <
1096                     cmd->convert_arg * cmd->chanlist_len) {
1097                         cmd->scan_begin_arg =
1098                             cmd->convert_arg * cmd->chanlist_len;
1099                         err++;
1100                 }
1101                 if (cmd->scan_begin_arg <
1102                     thisboard->ai_speed * cmd->chanlist_len) {
1103                         cmd->scan_begin_arg =
1104                             thisboard->ai_speed * cmd->chanlist_len;
1105                         err++;
1106                 }
1107         }
1108         /* stop source */
1109         switch (cmd->stop_src) {
1110         case TRIG_COUNT:
1111                 if (!cmd->stop_arg) {
1112                         cmd->stop_arg = 1;
1113                         err++;
1114                 }
1115                 break;
1116         case TRIG_NONE:
1117                 if (cmd->stop_arg != 0) {
1118                         cmd->stop_arg = 0;
1119                         err++;
1120                 }
1121                 break;
1122                 /*
1123                  * TRIG_EXT doesn't care since it doesn't
1124                  * trigger off a numbered channel
1125                  */
1126         default:
1127                 break;
1128         }
1129
1130         if (err)
1131                 return 3;
1132
1133         /* step 4: fix up any arguments */
1134
1135         tmp = cmd->convert_arg;
1136         tmp2 = cmd->scan_begin_arg;
1137         labpc_adc_timing(dev, cmd);
1138         if (tmp != cmd->convert_arg || tmp2 != cmd->scan_begin_arg)
1139                 err++;
1140
1141         if (err)
1142                 return 4;
1143
1144         if (labpc_ai_chanlist_invalid(dev, cmd))
1145                 return 5;
1146
1147         return 0;
1148 }
1149
1150 static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
1151 {
1152         int channel, range, aref;
1153 #ifdef CONFIG_ISA_DMA_API
1154         unsigned long irq_flags;
1155 #endif
1156         int ret;
1157         struct comedi_async *async = s->async;
1158         struct comedi_cmd *cmd = &async->cmd;
1159         enum transfer_type xfer;
1160         unsigned long flags;
1161
1162         if (!dev->irq) {
1163                 comedi_error(dev, "no irq assigned, cannot perform command");
1164                 return -1;
1165         }
1166
1167         range = CR_RANGE(cmd->chanlist[0]);
1168         aref = CR_AREF(cmd->chanlist[0]);
1169
1170         /* make sure board is disabled before setting up acquisition */
1171         spin_lock_irqsave(&dev->spinlock, flags);
1172         devpriv->command2_bits &= ~SWTRIG_BIT & ~HWTRIG_BIT & ~PRETRIG_BIT;
1173         devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1174         spin_unlock_irqrestore(&dev->spinlock, flags);
1175
1176         devpriv->command3_bits = 0;
1177         devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
1178
1179         /*  initialize software conversion count */
1180         if (cmd->stop_src == TRIG_COUNT)
1181                 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1182
1183         /*  setup hardware conversion counter */
1184         if (cmd->stop_src == TRIG_EXT) {
1185                 /*
1186                  * load counter a1 with count of 3
1187                  * (pc+ manual says this is minimum allowed) using mode 0
1188                  */
1189                 ret = labpc_counter_load(dev, dev->iobase + COUNTER_A_BASE_REG,
1190                                          1, 3, 0);
1191                 if (ret < 0) {
1192                         comedi_error(dev, "error loading counter a1");
1193                         return -1;
1194                 }
1195         } else                  /*
1196                                  * otherwise, just put a1 in mode 0
1197                                  * with no count to set its output low
1198                                  */
1199                 devpriv->write_byte(INIT_A1_BITS,
1200                                     dev->iobase + COUNTER_A_CONTROL_REG);
1201
1202 #ifdef CONFIG_ISA_DMA_API
1203         /*  figure out what method we will use to transfer data */
1204         if (devpriv->dma_chan &&        /*  need a dma channel allocated */
1205                 /*
1206                  * dma unsafe at RT priority,
1207                  * and too much setup time for TRIG_WAKE_EOS for
1208                  */
1209             (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT)) == 0 &&
1210             /*  only available on the isa boards */
1211             thisboard->bustype == isa_bustype) {
1212                 xfer = isa_dma_transfer;
1213                 /* pc-plus has no fifo-half full interrupt */
1214         } else
1215 #endif
1216         if (thisboard->register_layout == labpc_1200_layout &&
1217                    /*  wake-end-of-scan should interrupt on fifo not empty */
1218                    (cmd->flags & TRIG_WAKE_EOS) == 0 &&
1219                    /*  make sure we are taking more than just a few points */
1220                    (cmd->stop_src != TRIG_COUNT || devpriv->count > 256)) {
1221                 xfer = fifo_half_full_transfer;
1222         } else
1223                 xfer = fifo_not_empty_transfer;
1224         devpriv->current_transfer = xfer;
1225
1226         /*  setup command6 register for 1200 boards */
1227         if (thisboard->register_layout == labpc_1200_layout) {
1228                 /*  reference inputs to ground or common? */
1229                 if (aref != AREF_GROUND)
1230                         devpriv->command6_bits |= ADC_COMMON_BIT;
1231                 else
1232                         devpriv->command6_bits &= ~ADC_COMMON_BIT;
1233                 /*  bipolar or unipolar range? */
1234                 if (thisboard->ai_range_is_unipolar[range])
1235                         devpriv->command6_bits |= ADC_UNIP_BIT;
1236                 else
1237                         devpriv->command6_bits &= ~ADC_UNIP_BIT;
1238                 /*  interrupt on fifo half full? */
1239                 if (xfer == fifo_half_full_transfer)
1240                         devpriv->command6_bits |= ADC_FHF_INTR_EN_BIT;
1241                 else
1242                         devpriv->command6_bits &= ~ADC_FHF_INTR_EN_BIT;
1243                 /*  enable interrupt on counter a1 terminal count? */
1244                 if (cmd->stop_src == TRIG_EXT)
1245                         devpriv->command6_bits |= A1_INTR_EN_BIT;
1246                 else
1247                         devpriv->command6_bits &= ~A1_INTR_EN_BIT;
1248                 /*  are we scanning up or down through channels? */
1249                 if (labpc_ai_scan_mode(cmd) == MODE_MULT_CHAN_UP)
1250                         devpriv->command6_bits |= ADC_SCAN_UP_BIT;
1251                 else
1252                         devpriv->command6_bits &= ~ADC_SCAN_UP_BIT;
1253                 /*  write to register */
1254                 devpriv->write_byte(devpriv->command6_bits,
1255                                     dev->iobase + COMMAND6_REG);
1256         }
1257
1258         /* setup channel list, etc (command1 register) */
1259         devpriv->command1_bits = 0;
1260         if (labpc_ai_scan_mode(cmd) == MODE_MULT_CHAN_UP)
1261                 channel = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
1262         else
1263                 channel = CR_CHAN(cmd->chanlist[0]);
1264         /* munge channel bits for differential / scan disabled mode */
1265         if (labpc_ai_scan_mode(cmd) != MODE_SINGLE_CHAN && aref == AREF_DIFF)
1266                 channel *= 2;
1267         devpriv->command1_bits |= ADC_CHAN_BITS(channel);
1268         devpriv->command1_bits |= thisboard->ai_range_code[range];
1269         devpriv->write_byte(devpriv->command1_bits, dev->iobase + COMMAND1_REG);
1270         /* manual says to set scan enable bit on second pass */
1271         if (labpc_ai_scan_mode(cmd) == MODE_MULT_CHAN_UP ||
1272             labpc_ai_scan_mode(cmd) == MODE_MULT_CHAN_DOWN) {
1273                 devpriv->command1_bits |= ADC_SCAN_EN_BIT;
1274                 /* need a brief delay before enabling scan, or scan
1275                  * list will get screwed when you switch
1276                  * between scan up to scan down mode - dunno why */
1277                 udelay(1);
1278                 devpriv->write_byte(devpriv->command1_bits,
1279                                     dev->iobase + COMMAND1_REG);
1280         }
1281         /*  setup any external triggering/pacing (command4 register) */
1282         devpriv->command4_bits = 0;
1283         if (cmd->convert_src != TRIG_EXT)
1284                 devpriv->command4_bits |= EXT_CONVERT_DISABLE_BIT;
1285         /* XXX should discard first scan when using interval scanning
1286          * since manual says it is not synced with scan clock */
1287         if (labpc_use_continuous_mode(cmd) == 0) {
1288                 devpriv->command4_bits |= INTERVAL_SCAN_EN_BIT;
1289                 if (cmd->scan_begin_src == TRIG_EXT)
1290                         devpriv->command4_bits |= EXT_SCAN_EN_BIT;
1291         }
1292         /*  single-ended/differential */
1293         if (aref == AREF_DIFF)
1294                 devpriv->command4_bits |= ADC_DIFF_BIT;
1295         devpriv->write_byte(devpriv->command4_bits, dev->iobase + COMMAND4_REG);
1296
1297         devpriv->write_byte(cmd->chanlist_len,
1298                             dev->iobase + INTERVAL_COUNT_REG);
1299         /*  load count */
1300         devpriv->write_byte(INTERVAL_LOAD_BITS,
1301                             dev->iobase + INTERVAL_LOAD_REG);
1302
1303         if (cmd->convert_src == TRIG_TIMER || cmd->scan_begin_src == TRIG_TIMER) {
1304                 /*  set up pacing */
1305                 labpc_adc_timing(dev, cmd);
1306                 /*  load counter b0 in mode 3 */
1307                 ret = labpc_counter_load(dev, dev->iobase + COUNTER_B_BASE_REG,
1308                                          0, devpriv->divisor_b0, 3);
1309                 if (ret < 0) {
1310                         comedi_error(dev, "error loading counter b0");
1311                         return -1;
1312                 }
1313         }
1314         /*  set up conversion pacing */
1315         if (labpc_ai_convert_period(cmd)) {
1316                 /*  load counter a0 in mode 2 */
1317                 ret = labpc_counter_load(dev, dev->iobase + COUNTER_A_BASE_REG,
1318                                          0, devpriv->divisor_a0, 2);
1319                 if (ret < 0) {
1320                         comedi_error(dev, "error loading counter a0");
1321                         return -1;
1322                 }
1323         } else
1324                 devpriv->write_byte(INIT_A0_BITS,
1325                                     dev->iobase + COUNTER_A_CONTROL_REG);
1326
1327         /*  set up scan pacing */
1328         if (labpc_ai_scan_period(cmd)) {
1329                 /*  load counter b1 in mode 2 */
1330                 ret = labpc_counter_load(dev, dev->iobase + COUNTER_B_BASE_REG,
1331                                          1, devpriv->divisor_b1, 2);
1332                 if (ret < 0) {
1333                         comedi_error(dev, "error loading counter b1");
1334                         return -1;
1335                 }
1336         }
1337
1338         labpc_clear_adc_fifo(dev);
1339
1340 #ifdef CONFIG_ISA_DMA_API
1341         /*  set up dma transfer */
1342         if (xfer == isa_dma_transfer) {
1343                 irq_flags = claim_dma_lock();
1344                 disable_dma(devpriv->dma_chan);
1345                 /* clear flip-flop to make sure 2-byte registers for
1346                  * count and address get set correctly */
1347                 clear_dma_ff(devpriv->dma_chan);
1348                 set_dma_addr(devpriv->dma_chan,
1349                              virt_to_bus(devpriv->dma_buffer));
1350                 /*  set appropriate size of transfer */
1351                 devpriv->dma_transfer_size = labpc_suggest_transfer_size(*cmd);
1352                 if (cmd->stop_src == TRIG_COUNT &&
1353                     devpriv->count * sample_size < devpriv->dma_transfer_size) {
1354                         devpriv->dma_transfer_size =
1355                             devpriv->count * sample_size;
1356                 }
1357                 set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
1358                 enable_dma(devpriv->dma_chan);
1359                 release_dma_lock(irq_flags);
1360                 /*  enable board's dma */
1361                 devpriv->command3_bits |= DMA_EN_BIT | DMATC_INTR_EN_BIT;
1362         } else
1363                 devpriv->command3_bits &= ~DMA_EN_BIT & ~DMATC_INTR_EN_BIT;
1364 #endif
1365
1366         /*  enable error interrupts */
1367         devpriv->command3_bits |= ERR_INTR_EN_BIT;
1368         /*  enable fifo not empty interrupt? */
1369         if (xfer == fifo_not_empty_transfer)
1370                 devpriv->command3_bits |= ADC_FNE_INTR_EN_BIT;
1371         else
1372                 devpriv->command3_bits &= ~ADC_FNE_INTR_EN_BIT;
1373         devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
1374
1375         /*  startup acquisition */
1376
1377         /*  command2 reg */
1378         /*  use 2 cascaded counters for pacing */
1379         spin_lock_irqsave(&dev->spinlock, flags);
1380         devpriv->command2_bits |= CASCADE_BIT;
1381         switch (cmd->start_src) {
1382         case TRIG_EXT:
1383                 devpriv->command2_bits |= HWTRIG_BIT;
1384                 devpriv->command2_bits &= ~PRETRIG_BIT & ~SWTRIG_BIT;
1385                 break;
1386         case TRIG_NOW:
1387                 devpriv->command2_bits |= SWTRIG_BIT;
1388                 devpriv->command2_bits &= ~PRETRIG_BIT & ~HWTRIG_BIT;
1389                 break;
1390         default:
1391                 comedi_error(dev, "bug with start_src");
1392                 return -1;
1393                 break;
1394         }
1395         switch (cmd->stop_src) {
1396         case TRIG_EXT:
1397                 devpriv->command2_bits |= HWTRIG_BIT | PRETRIG_BIT;
1398                 break;
1399         case TRIG_COUNT:
1400         case TRIG_NONE:
1401                 break;
1402         default:
1403                 comedi_error(dev, "bug with stop_src");
1404                 return -1;
1405         }
1406         devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1407         spin_unlock_irqrestore(&dev->spinlock, flags);
1408
1409         return 0;
1410 }
1411
1412 /* interrupt service routine */
1413 static irqreturn_t labpc_interrupt(int irq, void *d)
1414 {
1415         struct comedi_device *dev = d;
1416         struct comedi_subdevice *s = dev->read_subdev;
1417         struct comedi_async *async;
1418         struct comedi_cmd *cmd;
1419
1420         if (dev->attached == 0) {
1421                 comedi_error(dev, "premature interrupt");
1422                 return IRQ_HANDLED;
1423         }
1424
1425         async = s->async;
1426         cmd = &async->cmd;
1427         async->events = 0;
1428
1429         /* read board status */
1430         devpriv->status1_bits = devpriv->read_byte(dev->iobase + STATUS1_REG);
1431         if (thisboard->register_layout == labpc_1200_layout)
1432                 devpriv->status2_bits =
1433                     devpriv->read_byte(dev->iobase + STATUS2_REG);
1434
1435         if ((devpriv->status1_bits & (DMATC_BIT | TIMER_BIT | OVERFLOW_BIT |
1436                                       OVERRUN_BIT | DATA_AVAIL_BIT)) == 0
1437             && (devpriv->status2_bits & A1_TC_BIT) == 0
1438             && (devpriv->status2_bits & FNHF_BIT)) {
1439                 return IRQ_NONE;
1440         }
1441
1442         if (devpriv->status1_bits & OVERRUN_BIT) {
1443                 /* clear error interrupt */
1444                 devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG);
1445                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1446                 comedi_event(dev, s);
1447                 comedi_error(dev, "overrun");
1448                 return IRQ_HANDLED;
1449         }
1450
1451 #ifdef CONFIG_ISA_DMA_API
1452         if (devpriv->current_transfer == isa_dma_transfer) {
1453                 /*
1454                  * if a dma terminal count of external stop trigger
1455                  * has occurred
1456                  */
1457                 if (devpriv->status1_bits & DMATC_BIT ||
1458                     (thisboard->register_layout == labpc_1200_layout
1459                      && devpriv->status2_bits & A1_TC_BIT)) {
1460                         handle_isa_dma(dev);
1461                 }
1462         } else
1463 #endif
1464                 labpc_drain_fifo(dev);
1465
1466         if (devpriv->status1_bits & TIMER_BIT) {
1467                 comedi_error(dev, "handled timer interrupt?");
1468                 /*  clear it */
1469                 devpriv->write_byte(0x1, dev->iobase + TIMER_CLEAR_REG);
1470         }
1471
1472         if (devpriv->status1_bits & OVERFLOW_BIT) {
1473                 /*  clear error interrupt */
1474                 devpriv->write_byte(0x1, dev->iobase + ADC_CLEAR_REG);
1475                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1476                 comedi_event(dev, s);
1477                 comedi_error(dev, "overflow");
1478                 return IRQ_HANDLED;
1479         }
1480         /*  handle external stop trigger */
1481         if (cmd->stop_src == TRIG_EXT) {
1482                 if (devpriv->status2_bits & A1_TC_BIT) {
1483                         labpc_drain_dregs(dev);
1484                         labpc_cancel(dev, s);
1485                         async->events |= COMEDI_CB_EOA;
1486                 }
1487         }
1488
1489         /* TRIG_COUNT end of acquisition */
1490         if (cmd->stop_src == TRIG_COUNT) {
1491                 if (devpriv->count == 0) {
1492                         labpc_cancel(dev, s);
1493                         async->events |= COMEDI_CB_EOA;
1494                 }
1495         }
1496
1497         comedi_event(dev, s);
1498         return IRQ_HANDLED;
1499 }
1500
1501 /* read all available samples from ai fifo */
1502 static int labpc_drain_fifo(struct comedi_device *dev)
1503 {
1504         unsigned int lsb, msb;
1505         short data;
1506         struct comedi_async *async = dev->read_subdev->async;
1507         const int timeout = 10000;
1508         unsigned int i;
1509
1510         devpriv->status1_bits = devpriv->read_byte(dev->iobase + STATUS1_REG);
1511
1512         for (i = 0; (devpriv->status1_bits & DATA_AVAIL_BIT) && i < timeout;
1513              i++) {
1514                 /*  quit if we have all the data we want */
1515                 if (async->cmd.stop_src == TRIG_COUNT) {
1516                         if (devpriv->count == 0)
1517                                 break;
1518                         devpriv->count--;
1519                 }
1520                 lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1521                 msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1522                 data = (msb << 8) | lsb;
1523                 cfc_write_to_buffer(dev->read_subdev, data);
1524                 devpriv->status1_bits =
1525                     devpriv->read_byte(dev->iobase + STATUS1_REG);
1526         }
1527         if (i == timeout) {
1528                 comedi_error(dev, "ai timeout, fifo never empties");
1529                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
1530                 return -1;
1531         }
1532
1533         return 0;
1534 }
1535
1536 #ifdef CONFIG_ISA_DMA_API
1537 static void labpc_drain_dma(struct comedi_device *dev)
1538 {
1539         struct comedi_subdevice *s = dev->read_subdev;
1540         struct comedi_async *async = s->async;
1541         int status;
1542         unsigned long flags;
1543         unsigned int max_points, num_points, residue, leftover;
1544         int i;
1545
1546         status = devpriv->status1_bits;
1547
1548         flags = claim_dma_lock();
1549         disable_dma(devpriv->dma_chan);
1550         /* clear flip-flop to make sure 2-byte registers for
1551          * count and address get set correctly */
1552         clear_dma_ff(devpriv->dma_chan);
1553
1554         /*  figure out how many points to read */
1555         max_points = devpriv->dma_transfer_size / sample_size;
1556         /* residue is the number of points left to be done on the dma
1557          * transfer.  It should always be zero at this point unless
1558          * the stop_src is set to external triggering.
1559          */
1560         residue = get_dma_residue(devpriv->dma_chan) / sample_size;
1561         num_points = max_points - residue;
1562         if (devpriv->count < num_points && async->cmd.stop_src == TRIG_COUNT)
1563                 num_points = devpriv->count;
1564
1565         /*  figure out how many points will be stored next time */
1566         leftover = 0;
1567         if (async->cmd.stop_src != TRIG_COUNT) {
1568                 leftover = devpriv->dma_transfer_size / sample_size;
1569         } else if (devpriv->count > num_points) {
1570                 leftover = devpriv->count - num_points;
1571                 if (leftover > max_points)
1572                         leftover = max_points;
1573         }
1574
1575         /* write data to comedi buffer */
1576         for (i = 0; i < num_points; i++)
1577                 cfc_write_to_buffer(s, devpriv->dma_buffer[i]);
1578
1579         if (async->cmd.stop_src == TRIG_COUNT)
1580                 devpriv->count -= num_points;
1581
1582         /*  set address and count for next transfer */
1583         set_dma_addr(devpriv->dma_chan, virt_to_bus(devpriv->dma_buffer));
1584         set_dma_count(devpriv->dma_chan, leftover * sample_size);
1585         release_dma_lock(flags);
1586
1587         async->events |= COMEDI_CB_BLOCK;
1588 }
1589
1590 static void handle_isa_dma(struct comedi_device *dev)
1591 {
1592         labpc_drain_dma(dev);
1593
1594         enable_dma(devpriv->dma_chan);
1595
1596         /*  clear dma tc interrupt */
1597         devpriv->write_byte(0x1, dev->iobase + DMATC_CLEAR_REG);
1598 }
1599 #endif
1600
1601 /* makes sure all data acquired by board is transferred to comedi (used
1602  * when acquisition is terminated by stop_src == TRIG_EXT). */
1603 static void labpc_drain_dregs(struct comedi_device *dev)
1604 {
1605 #ifdef CONFIG_ISA_DMA_API
1606         if (devpriv->current_transfer == isa_dma_transfer)
1607                 labpc_drain_dma(dev);
1608 #endif
1609
1610         labpc_drain_fifo(dev);
1611 }
1612
1613 static int labpc_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1614                           struct comedi_insn *insn, unsigned int *data)
1615 {
1616         int i, n;
1617         int chan, range;
1618         int lsb, msb;
1619         int timeout = 1000;
1620         unsigned long flags;
1621
1622         /*  disable timed conversions */
1623         spin_lock_irqsave(&dev->spinlock, flags);
1624         devpriv->command2_bits &= ~SWTRIG_BIT & ~HWTRIG_BIT & ~PRETRIG_BIT;
1625         devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1626         spin_unlock_irqrestore(&dev->spinlock, flags);
1627
1628         /*  disable interrupt generation and dma */
1629         devpriv->command3_bits = 0;
1630         devpriv->write_byte(devpriv->command3_bits, dev->iobase + COMMAND3_REG);
1631
1632         /* set gain and channel */
1633         devpriv->command1_bits = 0;
1634         chan = CR_CHAN(insn->chanspec);
1635         range = CR_RANGE(insn->chanspec);
1636         devpriv->command1_bits |= thisboard->ai_range_code[range];
1637         /* munge channel bits for differential/scan disabled mode */
1638         if (CR_AREF(insn->chanspec) == AREF_DIFF)
1639                 chan *= 2;
1640         devpriv->command1_bits |= ADC_CHAN_BITS(chan);
1641         devpriv->write_byte(devpriv->command1_bits, dev->iobase + COMMAND1_REG);
1642
1643         /* setup command6 register for 1200 boards */
1644         if (thisboard->register_layout == labpc_1200_layout) {
1645                 /*  reference inputs to ground or common? */
1646                 if (CR_AREF(insn->chanspec) != AREF_GROUND)
1647                         devpriv->command6_bits |= ADC_COMMON_BIT;
1648                 else
1649                         devpriv->command6_bits &= ~ADC_COMMON_BIT;
1650                 /* bipolar or unipolar range? */
1651                 if (thisboard->ai_range_is_unipolar[range])
1652                         devpriv->command6_bits |= ADC_UNIP_BIT;
1653                 else
1654                         devpriv->command6_bits &= ~ADC_UNIP_BIT;
1655                 /* don't interrupt on fifo half full */
1656                 devpriv->command6_bits &= ~ADC_FHF_INTR_EN_BIT;
1657                 /* don't enable interrupt on counter a1 terminal count? */
1658                 devpriv->command6_bits &= ~A1_INTR_EN_BIT;
1659                 /* write to register */
1660                 devpriv->write_byte(devpriv->command6_bits,
1661                                     dev->iobase + COMMAND6_REG);
1662         }
1663         /* setup command4 register */
1664         devpriv->command4_bits = 0;
1665         devpriv->command4_bits |= EXT_CONVERT_DISABLE_BIT;
1666         /* single-ended/differential */
1667         if (CR_AREF(insn->chanspec) == AREF_DIFF)
1668                 devpriv->command4_bits |= ADC_DIFF_BIT;
1669         devpriv->write_byte(devpriv->command4_bits, dev->iobase + COMMAND4_REG);
1670
1671         /*
1672          * initialize pacer counter output to make sure it doesn't
1673          * cause any problems
1674          */
1675         devpriv->write_byte(INIT_A0_BITS, dev->iobase + COUNTER_A_CONTROL_REG);
1676
1677         labpc_clear_adc_fifo(dev);
1678
1679         for (n = 0; n < insn->n; n++) {
1680                 /* trigger conversion */
1681                 devpriv->write_byte(0x1, dev->iobase + ADC_CONVERT_REG);
1682
1683                 for (i = 0; i < timeout; i++) {
1684                         if (devpriv->read_byte(dev->iobase +
1685                                                STATUS1_REG) & DATA_AVAIL_BIT)
1686                                 break;
1687                         udelay(1);
1688                 }
1689                 if (i == timeout) {
1690                         comedi_error(dev, "timeout");
1691                         return -ETIME;
1692                 }
1693                 lsb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1694                 msb = devpriv->read_byte(dev->iobase + ADC_FIFO_REG);
1695                 data[n] = (msb << 8) | lsb;
1696         }
1697
1698         return n;
1699 }
1700
1701 /* analog output insn */
1702 static int labpc_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1703                           struct comedi_insn *insn, unsigned int *data)
1704 {
1705         int channel, range;
1706         unsigned long flags;
1707         int lsb, msb;
1708
1709         channel = CR_CHAN(insn->chanspec);
1710
1711         /* turn off pacing of analog output channel */
1712         /* note: hardware bug in daqcard-1200 means pacing cannot
1713          * be independently enabled/disabled for its the two channels */
1714         spin_lock_irqsave(&dev->spinlock, flags);
1715         devpriv->command2_bits &= ~DAC_PACED_BIT(channel);
1716         devpriv->write_byte(devpriv->command2_bits, dev->iobase + COMMAND2_REG);
1717         spin_unlock_irqrestore(&dev->spinlock, flags);
1718
1719         /* set range */
1720         if (thisboard->register_layout == labpc_1200_layout) {
1721                 range = CR_RANGE(insn->chanspec);
1722                 if (range & AO_RANGE_IS_UNIPOLAR)
1723                         devpriv->command6_bits |= DAC_UNIP_BIT(channel);
1724                 else
1725                         devpriv->command6_bits &= ~DAC_UNIP_BIT(channel);
1726                 /*  write to register */
1727                 devpriv->write_byte(devpriv->command6_bits,
1728                                     dev->iobase + COMMAND6_REG);
1729         }
1730         /* send data */
1731         lsb = data[0] & 0xff;
1732         msb = (data[0] >> 8) & 0xff;
1733         devpriv->write_byte(lsb, dev->iobase + DAC_LSB_REG(channel));
1734         devpriv->write_byte(msb, dev->iobase + DAC_MSB_REG(channel));
1735
1736         /* remember value for readback */
1737         devpriv->ao_value[channel] = data[0];
1738
1739         return 1;
1740 }
1741
1742 /* analog output readback insn */
1743 static int labpc_ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1744                           struct comedi_insn *insn, unsigned int *data)
1745 {
1746         data[0] = devpriv->ao_value[CR_CHAN(insn->chanspec)];
1747
1748         return 1;
1749 }
1750
1751 static int labpc_calib_read_insn(struct comedi_device *dev,
1752                                  struct comedi_subdevice *s,
1753                                  struct comedi_insn *insn, unsigned int *data)
1754 {
1755         data[0] = devpriv->caldac[CR_CHAN(insn->chanspec)];
1756
1757         return 1;
1758 }
1759
1760 static int labpc_calib_write_insn(struct comedi_device *dev,
1761                                   struct comedi_subdevice *s,
1762                                   struct comedi_insn *insn, unsigned int *data)
1763 {
1764         int channel = CR_CHAN(insn->chanspec);
1765
1766         write_caldac(dev, channel, data[0]);
1767         return 1;
1768 }
1769
1770 static int labpc_eeprom_read_insn(struct comedi_device *dev,
1771                                   struct comedi_subdevice *s,
1772                                   struct comedi_insn *insn, unsigned int *data)
1773 {
1774         data[0] = devpriv->eeprom_data[CR_CHAN(insn->chanspec)];
1775
1776         return 1;
1777 }
1778
1779 static int labpc_eeprom_write_insn(struct comedi_device *dev,
1780                                    struct comedi_subdevice *s,
1781                                    struct comedi_insn *insn, unsigned int *data)
1782 {
1783         int channel = CR_CHAN(insn->chanspec);
1784         int ret;
1785
1786         /*  only allow writes to user area of eeprom */
1787         if (channel < 16 || channel > 127) {
1788                 printk
1789                     ("eeprom writes are only allowed to channels 16 through 127 (the pointer and user areas)");
1790                 return -EINVAL;
1791         }
1792
1793         ret = labpc_eeprom_write(dev, channel, data[0]);
1794         if (ret < 0)
1795                 return ret;
1796
1797         return 1;
1798 }
1799
1800 #ifdef CONFIG_ISA_DMA_API
1801 /* utility function that suggests a dma transfer size in bytes */
1802 static unsigned int labpc_suggest_transfer_size(struct comedi_cmd cmd)
1803 {
1804         unsigned int size;
1805         unsigned int freq;
1806
1807         if (cmd.convert_src == TRIG_TIMER)
1808                 freq = 1000000000 / cmd.convert_arg;
1809         /* return some default value */
1810         else
1811                 freq = 0xffffffff;
1812
1813         /* make buffer fill in no more than 1/3 second */
1814         size = (freq / 3) * sample_size;
1815
1816         /* set a minimum and maximum size allowed */
1817         if (size > dma_buffer_size)
1818                 size = dma_buffer_size - dma_buffer_size % sample_size;
1819         else if (size < sample_size)
1820                 size = sample_size;
1821
1822         return size;
1823 }
1824 #endif
1825
1826 /* figures out what counter values to use based on command */
1827 static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd)
1828 {
1829         /* max value for 16 bit counter in mode 2 */
1830         const int max_counter_value = 0x10000;
1831         /* min value for 16 bit counter in mode 2 */
1832         const int min_counter_value = 2;
1833         unsigned int base_period;
1834
1835         /*
1836          * if both convert and scan triggers are TRIG_TIMER, then they
1837          * both rely on counter b0
1838          */
1839         if (labpc_ai_convert_period(cmd) && labpc_ai_scan_period(cmd)) {
1840                 /*
1841                  * pick the lowest b0 divisor value we can (for maximum input
1842                  * clock speed on convert and scan counters)
1843                  */
1844                 devpriv->divisor_b0 = (labpc_ai_scan_period(cmd) - 1) /
1845                     (LABPC_TIMER_BASE * max_counter_value) + 1;
1846                 if (devpriv->divisor_b0 < min_counter_value)
1847                         devpriv->divisor_b0 = min_counter_value;
1848                 if (devpriv->divisor_b0 > max_counter_value)
1849                         devpriv->divisor_b0 = max_counter_value;
1850
1851                 base_period = LABPC_TIMER_BASE * devpriv->divisor_b0;
1852
1853                 /*  set a0 for conversion frequency and b1 for scan frequency */
1854                 switch (cmd->flags & TRIG_ROUND_MASK) {
1855                 default:
1856                 case TRIG_ROUND_NEAREST:
1857                         devpriv->divisor_a0 =
1858                             (labpc_ai_convert_period(cmd) +
1859                              (base_period / 2)) / base_period;
1860                         devpriv->divisor_b1 =
1861                             (labpc_ai_scan_period(cmd) +
1862                              (base_period / 2)) / base_period;
1863                         break;
1864                 case TRIG_ROUND_UP:
1865                         devpriv->divisor_a0 =
1866                             (labpc_ai_convert_period(cmd) + (base_period -
1867                                                              1)) / base_period;
1868                         devpriv->divisor_b1 =
1869                             (labpc_ai_scan_period(cmd) + (base_period -
1870                                                           1)) / base_period;
1871                         break;
1872                 case TRIG_ROUND_DOWN:
1873                         devpriv->divisor_a0 =
1874                             labpc_ai_convert_period(cmd) / base_period;
1875                         devpriv->divisor_b1 =
1876                             labpc_ai_scan_period(cmd) / base_period;
1877                         break;
1878                 }
1879                 /*  make sure a0 and b1 values are acceptable */
1880                 if (devpriv->divisor_a0 < min_counter_value)
1881                         devpriv->divisor_a0 = min_counter_value;
1882                 if (devpriv->divisor_a0 > max_counter_value)
1883                         devpriv->divisor_a0 = max_counter_value;
1884                 if (devpriv->divisor_b1 < min_counter_value)
1885                         devpriv->divisor_b1 = min_counter_value;
1886                 if (devpriv->divisor_b1 > max_counter_value)
1887                         devpriv->divisor_b1 = max_counter_value;
1888                 /*  write corrected timings to command */
1889                 labpc_set_ai_convert_period(cmd,
1890                                             base_period * devpriv->divisor_a0);
1891                 labpc_set_ai_scan_period(cmd,
1892                                          base_period * devpriv->divisor_b1);
1893                 /*
1894                  * if only one TRIG_TIMER is used, we can employ the generic
1895                  * cascaded timing functions
1896                  */
1897         } else if (labpc_ai_scan_period(cmd)) {
1898                 unsigned int scan_period;
1899
1900                 scan_period = labpc_ai_scan_period(cmd);
1901                 /*
1902                  * calculate cascaded counter values
1903                  * that give desired scan timing
1904                  */
1905                 i8253_cascade_ns_to_timer_2div(LABPC_TIMER_BASE,
1906                                                &(devpriv->divisor_b1),
1907                                                &(devpriv->divisor_b0),
1908                                                &scan_period,
1909                                                cmd->flags & TRIG_ROUND_MASK);
1910                 labpc_set_ai_scan_period(cmd, scan_period);
1911         } else if (labpc_ai_convert_period(cmd)) {
1912                 unsigned int convert_period;
1913
1914                 convert_period = labpc_ai_convert_period(cmd);
1915                 /*
1916                  * calculate cascaded counter values
1917                  * that give desired conversion timing
1918                  */
1919                 i8253_cascade_ns_to_timer_2div(LABPC_TIMER_BASE,
1920                                                &(devpriv->divisor_a0),
1921                                                &(devpriv->divisor_b0),
1922                                                &convert_period,
1923                                                cmd->flags & TRIG_ROUND_MASK);
1924                 labpc_set_ai_convert_period(cmd, convert_period);
1925         }
1926 }
1927
1928 static int labpc_dio_mem_callback(int dir, int port, int data,
1929                                   unsigned long iobase)
1930 {
1931         if (dir) {
1932                 writeb(data, (void *)(iobase + port));
1933                 return 0;
1934         } else {
1935                 return readb((void *)(iobase + port));
1936         }
1937 }
1938
1939 /* lowlevel write to eeprom/dac */
1940 static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
1941                              unsigned int value_width)
1942 {
1943         int i;
1944
1945         for (i = 1; i <= value_width; i++) {
1946                 /*  clear serial clock */
1947                 devpriv->command5_bits &= ~SCLOCK_BIT;
1948                 /*  send bits most significant bit first */
1949                 if (value & (1 << (value_width - i)))
1950                         devpriv->command5_bits |= SDATA_BIT;
1951                 else
1952                         devpriv->command5_bits &= ~SDATA_BIT;
1953                 udelay(1);
1954                 devpriv->write_byte(devpriv->command5_bits,
1955                                     dev->iobase + COMMAND5_REG);
1956                 /*  set clock to load bit */
1957                 devpriv->command5_bits |= SCLOCK_BIT;
1958                 udelay(1);
1959                 devpriv->write_byte(devpriv->command5_bits,
1960                                     dev->iobase + COMMAND5_REG);
1961         }
1962 }
1963
1964 /* lowlevel read from eeprom */
1965 static unsigned int labpc_serial_in(struct comedi_device *dev)
1966 {
1967         unsigned int value = 0;
1968         int i;
1969         const int value_width = 8;      /*  number of bits wide values are */
1970
1971         for (i = 1; i <= value_width; i++) {
1972                 /*  set serial clock */
1973                 devpriv->command5_bits |= SCLOCK_BIT;
1974                 udelay(1);
1975                 devpriv->write_byte(devpriv->command5_bits,
1976                                     dev->iobase + COMMAND5_REG);
1977                 /*  clear clock bit */
1978                 devpriv->command5_bits &= ~SCLOCK_BIT;
1979                 udelay(1);
1980                 devpriv->write_byte(devpriv->command5_bits,
1981                                     dev->iobase + COMMAND5_REG);
1982                 /*  read bits most significant bit first */
1983                 udelay(1);
1984                 devpriv->status2_bits =
1985                     devpriv->read_byte(dev->iobase + STATUS2_REG);
1986                 if (devpriv->status2_bits & EEPROM_OUT_BIT)
1987                         value |= 1 << (value_width - i);
1988         }
1989
1990         return value;
1991 }
1992
1993 static unsigned int labpc_eeprom_read(struct comedi_device *dev,
1994                                       unsigned int address)
1995 {
1996         unsigned int value;
1997         /*  bits to tell eeprom to expect a read */
1998         const int read_instruction = 0x3;
1999         /*  8 bit write lengths to eeprom */
2000         const int write_length = 8;
2001
2002         /*  enable read/write to eeprom */
2003         devpriv->command5_bits &= ~EEPROM_EN_BIT;
2004         udelay(1);
2005         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2006         devpriv->command5_bits |= EEPROM_EN_BIT | EEPROM_WRITE_UNPROTECT_BIT;
2007         udelay(1);
2008         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2009
2010         /*  send read instruction */
2011         labpc_serial_out(dev, read_instruction, write_length);
2012         /*  send 8 bit address to read from */
2013         labpc_serial_out(dev, address, write_length);
2014         /*  read result */
2015         value = labpc_serial_in(dev);
2016
2017         /*  disable read/write to eeprom */
2018         devpriv->command5_bits &= ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2019         udelay(1);
2020         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2021
2022         return value;
2023 }
2024
2025 static int labpc_eeprom_write(struct comedi_device *dev,
2026                                 unsigned int address, unsigned int value)
2027 {
2028         const int write_enable_instruction = 0x6;
2029         const int write_instruction = 0x2;
2030         const int write_length = 8;     /*  8 bit write lengths to eeprom */
2031         const int write_in_progress_bit = 0x1;
2032         const int timeout = 10000;
2033         int i;
2034
2035         /*  make sure there isn't already a write in progress */
2036         for (i = 0; i < timeout; i++) {
2037                 if ((labpc_eeprom_read_status(dev) & write_in_progress_bit) ==
2038                     0)
2039                         break;
2040         }
2041         if (i == timeout) {
2042                 comedi_error(dev, "eeprom write timed out");
2043                 return -ETIME;
2044         }
2045         /*  update software copy of eeprom */
2046         devpriv->eeprom_data[address] = value;
2047
2048         /*  enable read/write to eeprom */
2049         devpriv->command5_bits &= ~EEPROM_EN_BIT;
2050         udelay(1);
2051         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2052         devpriv->command5_bits |= EEPROM_EN_BIT | EEPROM_WRITE_UNPROTECT_BIT;
2053         udelay(1);
2054         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2055
2056         /*  send write_enable instruction */
2057         labpc_serial_out(dev, write_enable_instruction, write_length);
2058         devpriv->command5_bits &= ~EEPROM_EN_BIT;
2059         udelay(1);
2060         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2061
2062         /*  send write instruction */
2063         devpriv->command5_bits |= EEPROM_EN_BIT;
2064         udelay(1);
2065         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2066         labpc_serial_out(dev, write_instruction, write_length);
2067         /*  send 8 bit address to write to */
2068         labpc_serial_out(dev, address, write_length);
2069         /*  write value */
2070         labpc_serial_out(dev, value, write_length);
2071         devpriv->command5_bits &= ~EEPROM_EN_BIT;
2072         udelay(1);
2073         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2074
2075         /*  disable read/write to eeprom */
2076         devpriv->command5_bits &= ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2077         udelay(1);
2078         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2079
2080         return 0;
2081 }
2082
2083 static unsigned int labpc_eeprom_read_status(struct comedi_device *dev)
2084 {
2085         unsigned int value;
2086         const int read_status_instruction = 0x5;
2087         const int write_length = 8;     /*  8 bit write lengths to eeprom */
2088
2089         /*  enable read/write to eeprom */
2090         devpriv->command5_bits &= ~EEPROM_EN_BIT;
2091         udelay(1);
2092         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2093         devpriv->command5_bits |= EEPROM_EN_BIT | EEPROM_WRITE_UNPROTECT_BIT;
2094         udelay(1);
2095         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2096
2097         /*  send read status instruction */
2098         labpc_serial_out(dev, read_status_instruction, write_length);
2099         /*  read result */
2100         value = labpc_serial_in(dev);
2101
2102         /*  disable read/write to eeprom */
2103         devpriv->command5_bits &= ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2104         udelay(1);
2105         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2106
2107         return value;
2108 }
2109
2110 /* writes to 8 bit calibration dacs */
2111 static void write_caldac(struct comedi_device *dev, unsigned int channel,
2112                          unsigned int value)
2113 {
2114         if (value == devpriv->caldac[channel])
2115                 return;
2116         devpriv->caldac[channel] = value;
2117
2118         /*  clear caldac load bit and make sure we don't write to eeprom */
2119         devpriv->command5_bits &=
2120             ~CALDAC_LOAD_BIT & ~EEPROM_EN_BIT & ~EEPROM_WRITE_UNPROTECT_BIT;
2121         udelay(1);
2122         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2123
2124         /*  write 4 bit channel */
2125         labpc_serial_out(dev, channel, 4);
2126         /*  write 8 bit caldac value */
2127         labpc_serial_out(dev, value, 8);
2128
2129         /*  set and clear caldac bit to load caldac value */
2130         devpriv->command5_bits |= CALDAC_LOAD_BIT;
2131         udelay(1);
2132         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2133         devpriv->command5_bits &= ~CALDAC_LOAD_BIT;
2134         udelay(1);
2135         devpriv->write_byte(devpriv->command5_bits, dev->iobase + COMMAND5_REG);
2136 }
2137
2138 #ifdef CONFIG_COMEDI_PCI
2139 static int __devinit driver_labpc_pci_probe(struct pci_dev *dev,
2140                                             const struct pci_device_id *ent)
2141 {
2142         return comedi_pci_auto_config(dev, driver_labpc.driver_name);
2143 }
2144
2145 static void __devexit driver_labpc_pci_remove(struct pci_dev *dev)
2146 {
2147         comedi_pci_auto_unconfig(dev);
2148 }
2149
2150 static struct pci_driver driver_labpc_pci_driver = {
2151         .id_table = labpc_pci_table,
2152         .probe = &driver_labpc_pci_probe,
2153         .remove = __devexit_p(&driver_labpc_pci_remove)
2154 };
2155
2156 static int __init driver_labpc_init_module(void)
2157 {
2158         int retval;
2159
2160         retval = comedi_driver_register(&driver_labpc);
2161         if (retval < 0)
2162                 return retval;
2163
2164         driver_labpc_pci_driver.name = (char *)driver_labpc.driver_name;
2165         return pci_register_driver(&driver_labpc_pci_driver);
2166 }
2167
2168 static void __exit driver_labpc_cleanup_module(void)
2169 {
2170         pci_unregister_driver(&driver_labpc_pci_driver);
2171         comedi_driver_unregister(&driver_labpc);
2172 }
2173
2174 module_init(driver_labpc_init_module);
2175 module_exit(driver_labpc_cleanup_module);
2176 #else
2177 static int __init driver_labpc_init_module(void)
2178 {
2179         return comedi_driver_register(&driver_labpc);
2180 }
2181
2182 static void __exit driver_labpc_cleanup_module(void)
2183 {
2184         comedi_driver_unregister(&driver_labpc);
2185 }
2186
2187 module_init(driver_labpc_init_module);
2188 module_exit(driver_labpc_cleanup_module);
2189 #endif
2190
2191
2192 MODULE_AUTHOR("Comedi http://www.comedi.org");
2193 MODULE_DESCRIPTION("Comedi low-level driver");
2194 MODULE_LICENSE("GPL");