linux/drivers/staging/comedi/drivers/amplc_pci224.c
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   1/*
   2 * comedi/drivers/amplc_pci224.c
   3 * Driver for Amplicon PCI224 and PCI234 AO boards.
   4 *
   5 * Copyright (C) 2005 MEV Ltd. <http://www.mev.co.uk/>
   6 *
   7 * COMEDI - Linux Control and Measurement Device Interface
   8 * Copyright (C) 1998,2000 David A. Schleef <ds@schleef.org>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 */
  20
  21/*
  22 * Driver: amplc_pci224
  23 * Description: Amplicon PCI224, PCI234
  24 * Author: Ian Abbott <abbotti@mev.co.uk>
  25 * Devices: [Amplicon] PCI224 (amplc_pci224), PCI234
  26 * Updated: Thu, 31 Jul 2014 11:08:03 +0000
  27 * Status: works, but see caveats
  28 *
  29 * Supports:
  30 *
  31 *   - ao_insn read/write
  32 *   - ao_do_cmd mode with the following sources:
  33 *
  34 *     - start_src         TRIG_INT        TRIG_EXT
  35 *     - scan_begin_src    TRIG_TIMER      TRIG_EXT
  36 *     - convert_src       TRIG_NOW
  37 *     - scan_end_src      TRIG_COUNT
  38 *     - stop_src          TRIG_COUNT      TRIG_EXT        TRIG_NONE
  39 *
  40 *     The channel list must contain at least one channel with no repeated
  41 *     channels.  The scan end count must equal the number of channels in
  42 *     the channel list.
  43 *
  44 *     There is only one external trigger source so only one of start_src,
  45 *     scan_begin_src or stop_src may use TRIG_EXT.
  46 *
  47 * Configuration options:
  48 *   none
  49 *
  50 * Manual configuration of PCI cards is not supported; they are configured
  51 * automatically.
  52 *
  53 * Output range selection - PCI224:
  54 *
  55 *   Output ranges on PCI224 are partly software-selectable and partly
  56 *   hardware-selectable according to jumper LK1.  All channels are set
  57 *   to the same range:
  58 *
  59 *   - LK1 position 1-2 (factory default) corresponds to the following
  60 *     comedi ranges:
  61 *
  62 *       0: [-10V,+10V]; 1: [-5V,+5V]; 2: [-2.5V,+2.5V], 3: [-1.25V,+1.25V],
  63 *       4: [0,+10V],    5: [0,+5V],   6: [0,+2.5V],     7: [0,+1.25V]
  64 *
  65 *   - LK1 position 2-3 corresponds to the following Comedi ranges, using
  66 *     an external voltage reference:
  67 *
  68 *       0: [-Vext,+Vext],
  69 *       1: [0,+Vext]
  70 *
  71 * Output range selection - PCI234:
  72 *
  73 *   Output ranges on PCI234 are hardware-selectable according to jumper
  74 *   LK1 which affects all channels, and jumpers LK2, LK3, LK4 and LK5
  75 *   which affect channels 0, 1, 2 and 3 individually.  LK1 chooses between
  76 *   an internal 5V reference and an external voltage reference (Vext).
  77 *   LK2/3/4/5 choose (per channel) to double the reference or not according
  78 *   to the following table:
  79 *
  80 *     LK1 position   LK2/3/4/5 pos  Comedi range
  81 *     -------------  -------------  --------------
  82 *     2-3 (factory)  1-2 (factory)  0: [-10V,+10V]
  83 *     2-3 (factory)  2-3            1: [-5V,+5V]
  84 *     1-2            1-2 (factory)  2: [-2*Vext,+2*Vext]
  85 *     1-2            2-3            3: [-Vext,+Vext]
  86 *
  87 * Caveats:
  88 *
  89 *   1) All channels on the PCI224 share the same range.  Any change to the
  90 *      range as a result of insn_write or a streaming command will affect
  91 *      the output voltages of all channels, including those not specified
  92 *      by the instruction or command.
  93 *
  94 *   2) For the analog output command,  the first scan may be triggered
  95 *      falsely at the start of acquisition.  This occurs when the DAC scan
  96 *      trigger source is switched from 'none' to 'timer' (scan_begin_src =
  97 *      TRIG_TIMER) or 'external' (scan_begin_src == TRIG_EXT) at the start
  98 *      of acquisition and the trigger source is at logic level 1 at the
  99 *      time of the switch.  This is very likely for TRIG_TIMER.  For
 100 *      TRIG_EXT, it depends on the state of the external line and whether
 101 *      the CR_INVERT flag has been set.  The remaining scans are triggered
 102 *      correctly.
 103 */
 104
 105#include <linux/module.h>
 106#include <linux/interrupt.h>
 107#include <linux/slab.h>
 108
 109#include "../comedi_pci.h"
 110
 111#include "comedi_8254.h"
 112
 113/*
 114 * PCI224/234 i/o space 1 (PCIBAR2) registers.
 115 */
 116#define PCI224_Z2_BASE  0x14    /* 82C54 counter/timer */
 117#define PCI224_ZCLK_SCE 0x1A    /* Group Z Clock Configuration Register */
 118#define PCI224_ZGAT_SCE 0x1D    /* Group Z Gate Configuration Register */
 119#define PCI224_INT_SCE  0x1E    /* ISR Interrupt source mask register */
 120                                /* /Interrupt status */
 121
 122/*
 123 * PCI224/234 i/o space 2 (PCIBAR3) 16-bit registers.
 124 */
 125#define PCI224_DACDATA  0x00    /* (w-o) DAC FIFO data. */
 126#define PCI224_SOFTTRIG 0x00    /* (r-o) DAC software scan trigger. */
 127#define PCI224_DACCON   0x02    /* (r/w) DAC status/configuration. */
 128#define PCI224_FIFOSIZ  0x04    /* (w-o) FIFO size for wraparound mode. */
 129#define PCI224_DACCEN   0x06    /* (w-o) DAC channel enable register. */
 130
 131/*
 132 * DACCON values.
 133 */
 134/* (r/w) Scan trigger. */
 135#define PCI224_DACCON_TRIG(x)           (((x) & 0x7) << 0)
 136#define PCI224_DACCON_TRIG_MASK         PCI224_DACCON_TRIG(7)
 137#define PCI224_DACCON_TRIG_NONE         PCI224_DACCON_TRIG(0)   /* none */
 138#define PCI224_DACCON_TRIG_SW           PCI224_DACCON_TRIG(1)   /* soft trig */
 139#define PCI224_DACCON_TRIG_EXTP         PCI224_DACCON_TRIG(2)   /* ext + edge */
 140#define PCI224_DACCON_TRIG_EXTN         PCI224_DACCON_TRIG(3)   /* ext - edge */
 141#define PCI224_DACCON_TRIG_Z2CT0        PCI224_DACCON_TRIG(4)   /* Z2 CT0 out */
 142#define PCI224_DACCON_TRIG_Z2CT1        PCI224_DACCON_TRIG(5)   /* Z2 CT1 out */
 143#define PCI224_DACCON_TRIG_Z2CT2        PCI224_DACCON_TRIG(6)   /* Z2 CT2 out */
 144/* (r/w) Polarity (PCI224 only, PCI234 always bipolar!). */
 145#define PCI224_DACCON_POLAR(x)          (((x) & 0x1) << 3)
 146#define PCI224_DACCON_POLAR_MASK        PCI224_DACCON_POLAR(1)
 147#define PCI224_DACCON_POLAR_UNI         PCI224_DACCON_POLAR(0)  /* [0,+V] */
 148#define PCI224_DACCON_POLAR_BI          PCI224_DACCON_POLAR(1)  /* [-V,+V] */
 149/* (r/w) Internal Vref (PCI224 only, when LK1 in position 1-2). */
 150#define PCI224_DACCON_VREF(x)           (((x) & 0x3) << 4)
 151#define PCI224_DACCON_VREF_MASK         PCI224_DACCON_VREF(3)
 152#define PCI224_DACCON_VREF_1_25         PCI224_DACCON_VREF(0)   /* 1.25V */
 153#define PCI224_DACCON_VREF_2_5          PCI224_DACCON_VREF(1)   /* 2.5V */
 154#define PCI224_DACCON_VREF_5            PCI224_DACCON_VREF(2)   /* 5V */
 155#define PCI224_DACCON_VREF_10           PCI224_DACCON_VREF(3)   /* 10V */
 156/* (r/w) Wraparound mode enable (to play back stored waveform). */
 157#define PCI224_DACCON_FIFOWRAP          BIT(7)
 158/* (r/w) FIFO enable.  It MUST be set! */
 159#define PCI224_DACCON_FIFOENAB          BIT(8)
 160/* (r/w) FIFO interrupt trigger level (most values are not very useful). */
 161#define PCI224_DACCON_FIFOINTR(x)       (((x) & 0x7) << 9)
 162#define PCI224_DACCON_FIFOINTR_MASK     PCI224_DACCON_FIFOINTR(7)
 163#define PCI224_DACCON_FIFOINTR_EMPTY    PCI224_DACCON_FIFOINTR(0) /* empty */
 164#define PCI224_DACCON_FIFOINTR_NEMPTY   PCI224_DACCON_FIFOINTR(1) /* !empty */
 165#define PCI224_DACCON_FIFOINTR_NHALF    PCI224_DACCON_FIFOINTR(2) /* !half */
 166#define PCI224_DACCON_FIFOINTR_HALF     PCI224_DACCON_FIFOINTR(3) /* half */
 167#define PCI224_DACCON_FIFOINTR_NFULL    PCI224_DACCON_FIFOINTR(4) /* !full */
 168#define PCI224_DACCON_FIFOINTR_FULL     PCI224_DACCON_FIFOINTR(5) /* full */
 169/* (r-o) FIFO fill level. */
 170#define PCI224_DACCON_FIFOFL(x)         (((x) & 0x7) << 12)
 171#define PCI224_DACCON_FIFOFL_MASK       PCI224_DACCON_FIFOFL(7)
 172#define PCI224_DACCON_FIFOFL_EMPTY      PCI224_DACCON_FIFOFL(1) /* 0 */
 173#define PCI224_DACCON_FIFOFL_ONETOHALF  PCI224_DACCON_FIFOFL(0) /* 1-2048 */
 174#define PCI224_DACCON_FIFOFL_HALFTOFULL PCI224_DACCON_FIFOFL(4) /* 2049-4095 */
 175#define PCI224_DACCON_FIFOFL_FULL       PCI224_DACCON_FIFOFL(6) /* 4096 */
 176/* (r-o) DAC busy flag. */
 177#define PCI224_DACCON_BUSY              BIT(15)
 178/* (w-o) FIFO reset. */
 179#define PCI224_DACCON_FIFORESET         BIT(12)
 180/* (w-o) Global reset (not sure what it does). */
 181#define PCI224_DACCON_GLOBALRESET       BIT(13)
 182
 183/*
 184 * DAC FIFO size.
 185 */
 186#define PCI224_FIFO_SIZE        4096
 187
 188/*
 189 * DAC FIFO guaranteed minimum room available, depending on reported fill level.
 190 * The maximum room available depends on the reported fill level and how much
 191 * has been written!
 192 */
 193#define PCI224_FIFO_ROOM_EMPTY          PCI224_FIFO_SIZE
 194#define PCI224_FIFO_ROOM_ONETOHALF      (PCI224_FIFO_SIZE / 2)
 195#define PCI224_FIFO_ROOM_HALFTOFULL     1
 196#define PCI224_FIFO_ROOM_FULL           0
 197
 198/*
 199 * Counter/timer clock input configuration sources.
 200 */
 201#define CLK_CLK         0       /* reserved (channel-specific clock) */
 202#define CLK_10MHZ       1       /* internal 10 MHz clock */
 203#define CLK_1MHZ        2       /* internal 1 MHz clock */
 204#define CLK_100KHZ      3       /* internal 100 kHz clock */
 205#define CLK_10KHZ       4       /* internal 10 kHz clock */
 206#define CLK_1KHZ        5       /* internal 1 kHz clock */
 207#define CLK_OUTNM1      6       /* output of channel-1 modulo total */
 208#define CLK_EXT         7       /* external clock */
 209/* Macro to construct clock input configuration register value. */
 210#define CLK_CONFIG(chan, src)   ((((chan) & 3) << 3) | ((src) & 7))
 211
 212/*
 213 * Counter/timer gate input configuration sources.
 214 */
 215#define GAT_VCC         0       /* VCC (i.e. enabled) */
 216#define GAT_GND         1       /* GND (i.e. disabled) */
 217#define GAT_EXT         2       /* reserved (external gate input) */
 218#define GAT_NOUTNM2     3       /* inverted output of channel-2 modulo total */
 219/* Macro to construct gate input configuration register value. */
 220#define GAT_CONFIG(chan, src)   ((((chan) & 3) << 3) | ((src) & 7))
 221
 222/*
 223 * Summary of CLK_OUTNM1 and GAT_NOUTNM2 connections for PCI224 and PCI234:
 224 *
 225 *              Channel's       Channel's
 226 *              clock input     gate input
 227 * Channel      CLK_OUTNM1      GAT_NOUTNM2
 228 * -------      ----------      -----------
 229 * Z2-CT0       Z2-CT2-OUT      /Z2-CT1-OUT
 230 * Z2-CT1       Z2-CT0-OUT      /Z2-CT2-OUT
 231 * Z2-CT2       Z2-CT1-OUT      /Z2-CT0-OUT
 232 */
 233
 234/*
 235 * Interrupt enable/status bits
 236 */
 237#define PCI224_INTR_EXT         0x01    /* rising edge on external input */
 238#define PCI224_INTR_DAC         0x04    /* DAC (FIFO) interrupt */
 239#define PCI224_INTR_Z2CT1       0x20    /* rising edge on Z2-CT1 output */
 240
 241#define PCI224_INTR_EDGE_BITS   (PCI224_INTR_EXT | PCI224_INTR_Z2CT1)
 242#define PCI224_INTR_LEVEL_BITS  PCI224_INTR_DACFIFO
 243
 244/*
 245 * Handy macros.
 246 */
 247
 248/* Combine old and new bits. */
 249#define COMBINE(old, new, mask) (((old) & ~(mask)) | ((new) & (mask)))
 250
 251/* Current CPU.  XXX should this be hard_smp_processor_id()? */
 252#define THISCPU         smp_processor_id()
 253
 254/* State bits for use with atomic bit operations. */
 255#define AO_CMD_STARTED  0
 256
 257/*
 258 * Range tables.
 259 */
 260
 261/*
 262 * The ranges for PCI224.
 263 *
 264 * These are partly hardware-selectable by jumper LK1 and partly
 265 * software-selectable.
 266 *
 267 * All channels share the same hardware range.
 268 */
 269static const struct comedi_lrange range_pci224 = {
 270        10, {
 271                /* jumper LK1 in position 1-2 (factory default) */
 272                BIP_RANGE(10),
 273                BIP_RANGE(5),
 274                BIP_RANGE(2.5),
 275                BIP_RANGE(1.25),
 276                UNI_RANGE(10),
 277                UNI_RANGE(5),
 278                UNI_RANGE(2.5),
 279                UNI_RANGE(1.25),
 280                /* jumper LK1 in position 2-3 */
 281                RANGE_ext(-1, 1),       /* bipolar [-Vext,+Vext] */
 282                RANGE_ext(0, 1),        /* unipolar [0,+Vext] */
 283        }
 284};
 285
 286static const unsigned short hwrange_pci224[10] = {
 287        /* jumper LK1 in position 1-2 (factory default) */
 288        PCI224_DACCON_POLAR_BI | PCI224_DACCON_VREF_10,
 289        PCI224_DACCON_POLAR_BI | PCI224_DACCON_VREF_5,
 290        PCI224_DACCON_POLAR_BI | PCI224_DACCON_VREF_2_5,
 291        PCI224_DACCON_POLAR_BI | PCI224_DACCON_VREF_1_25,
 292        PCI224_DACCON_POLAR_UNI | PCI224_DACCON_VREF_10,
 293        PCI224_DACCON_POLAR_UNI | PCI224_DACCON_VREF_5,
 294        PCI224_DACCON_POLAR_UNI | PCI224_DACCON_VREF_2_5,
 295        PCI224_DACCON_POLAR_UNI | PCI224_DACCON_VREF_1_25,
 296        /* jumper LK1 in position 2-3 */
 297        PCI224_DACCON_POLAR_BI,
 298        PCI224_DACCON_POLAR_UNI,
 299};
 300
 301/* Used to check all channels set to the same range on PCI224. */
 302static const unsigned char range_check_pci224[10] = {
 303        0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
 304};
 305
 306/*
 307 * The ranges for PCI234.
 308 *
 309 * These are all hardware-selectable by jumper LK1 affecting all channels,
 310 * and jumpers LK2, LK3, LK4 and LK5 affecting channels 0, 1, 2 and 3
 311 * individually.
 312 */
 313static const struct comedi_lrange range_pci234 = {
 314        4, {
 315                /* LK1: 1-2 (fact def), LK2/3/4/5: 2-3 (fac def) */
 316                BIP_RANGE(10),
 317                /* LK1: 1-2 (fact def), LK2/3/4/5: 1-2 */
 318                BIP_RANGE(5),
 319                /* LK1: 2-3, LK2/3/4/5: 2-3 (fac def) */
 320                RANGE_ext(-2, 2),       /* bipolar [-2*Vext,+2*Vext] */
 321                /* LK1: 2-3, LK2/3/4/5: 1-2 */
 322                RANGE_ext(-1, 1),       /* bipolar [-Vext,+Vext] */
 323        }
 324};
 325
 326/* N.B. PCI234 ignores the polarity bit, but software uses it. */
 327static const unsigned short hwrange_pci234[4] = {
 328        PCI224_DACCON_POLAR_BI,
 329        PCI224_DACCON_POLAR_BI,
 330        PCI224_DACCON_POLAR_BI,
 331        PCI224_DACCON_POLAR_BI,
 332};
 333
 334/* Used to check all channels use same LK1 setting on PCI234. */
 335static const unsigned char range_check_pci234[4] = {
 336        0, 0, 1, 1,
 337};
 338
 339/*
 340 * Board descriptions.
 341 */
 342
 343enum pci224_model { pci224_model, pci234_model };
 344
 345struct pci224_board {
 346        const char *name;
 347        unsigned int ao_chans;
 348        unsigned int ao_bits;
 349        const struct comedi_lrange *ao_range;
 350        const unsigned short *ao_hwrange;
 351        const unsigned char *ao_range_check;
 352};
 353
 354static const struct pci224_board pci224_boards[] = {
 355        [pci224_model] = {
 356                .name           = "pci224",
 357                .ao_chans       = 16,
 358                .ao_bits        = 12,
 359                .ao_range       = &range_pci224,
 360                .ao_hwrange     = &hwrange_pci224[0],
 361                .ao_range_check = &range_check_pci224[0],
 362        },
 363        [pci234_model] = {
 364                .name           = "pci234",
 365                .ao_chans       = 4,
 366                .ao_bits        = 16,
 367                .ao_range       = &range_pci234,
 368                .ao_hwrange     = &hwrange_pci234[0],
 369                .ao_range_check = &range_check_pci234[0],
 370        },
 371};
 372
 373struct pci224_private {
 374        unsigned long iobase1;
 375        unsigned long state;
 376        spinlock_t ao_spinlock; /* spinlock for AO command handling */
 377        unsigned short *ao_scan_vals;
 378        unsigned char *ao_scan_order;
 379        int intr_cpuid;
 380        short intr_running;
 381        unsigned short daccon;
 382        unsigned short ao_enab; /* max 16 channels so 'short' will do */
 383        unsigned char intsce;
 384};
 385
 386/*
 387 * Called from the 'insn_write' function to perform a single write.
 388 */
 389static void
 390pci224_ao_set_data(struct comedi_device *dev, int chan, int range,
 391                   unsigned int data)
 392{
 393        const struct pci224_board *board = dev->board_ptr;
 394        struct pci224_private *devpriv = dev->private;
 395        unsigned short mangled;
 396
 397        /* Enable the channel. */
 398        outw(1 << chan, dev->iobase + PCI224_DACCEN);
 399        /* Set range and reset FIFO. */
 400        devpriv->daccon = COMBINE(devpriv->daccon, board->ao_hwrange[range],
 401                                  PCI224_DACCON_POLAR_MASK |
 402                                  PCI224_DACCON_VREF_MASK);
 403        outw(devpriv->daccon | PCI224_DACCON_FIFORESET,
 404             dev->iobase + PCI224_DACCON);
 405        /*
 406         * Mangle the data.  The hardware expects:
 407         * - bipolar: 16-bit 2's complement
 408         * - unipolar: 16-bit unsigned
 409         */
 410        mangled = (unsigned short)data << (16 - board->ao_bits);
 411        if ((devpriv->daccon & PCI224_DACCON_POLAR_MASK) ==
 412            PCI224_DACCON_POLAR_BI) {
 413                mangled ^= 0x8000;
 414        }
 415        /* Write mangled data to the FIFO. */
 416        outw(mangled, dev->iobase + PCI224_DACDATA);
 417        /* Trigger the conversion. */
 418        inw(dev->iobase + PCI224_SOFTTRIG);
 419}
 420
 421static int pci224_ao_insn_write(struct comedi_device *dev,
 422                                struct comedi_subdevice *s,
 423                                struct comedi_insn *insn,
 424                                unsigned int *data)
 425{
 426        unsigned int chan = CR_CHAN(insn->chanspec);
 427        unsigned int range = CR_RANGE(insn->chanspec);
 428        unsigned int val = s->readback[chan];
 429        int i;
 430
 431        for (i = 0; i < insn->n; i++) {
 432                val = data[i];
 433                pci224_ao_set_data(dev, chan, range, val);
 434        }
 435        s->readback[chan] = val;
 436
 437        return insn->n;
 438}
 439
 440/*
 441 * Kills a command running on the AO subdevice.
 442 */
 443static void pci224_ao_stop(struct comedi_device *dev,
 444                           struct comedi_subdevice *s)
 445{
 446        struct pci224_private *devpriv = dev->private;
 447        unsigned long flags;
 448
 449        if (!test_and_clear_bit(AO_CMD_STARTED, &devpriv->state))
 450                return;
 451
 452        spin_lock_irqsave(&devpriv->ao_spinlock, flags);
 453        /* Kill the interrupts. */
 454        devpriv->intsce = 0;
 455        outb(0, devpriv->iobase1 + PCI224_INT_SCE);
 456        /*
 457         * Interrupt routine may or may not be running.  We may or may not
 458         * have been called from the interrupt routine (directly or
 459         * indirectly via a comedi_events() callback routine).  It's highly
 460         * unlikely that we've been called from some other interrupt routine
 461         * but who knows what strange things coders get up to!
 462         *
 463         * If the interrupt routine is currently running, wait for it to
 464         * finish, unless we appear to have been called via the interrupt
 465         * routine.
 466         */
 467        while (devpriv->intr_running && devpriv->intr_cpuid != THISCPU) {
 468                spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
 469                spin_lock_irqsave(&devpriv->ao_spinlock, flags);
 470        }
 471        spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
 472        /* Reconfigure DAC for insn_write usage. */
 473        outw(0, dev->iobase + PCI224_DACCEN);   /* Disable channels. */
 474        devpriv->daccon =
 475             COMBINE(devpriv->daccon,
 476                     PCI224_DACCON_TRIG_SW | PCI224_DACCON_FIFOINTR_EMPTY,
 477                     PCI224_DACCON_TRIG_MASK | PCI224_DACCON_FIFOINTR_MASK);
 478        outw(devpriv->daccon | PCI224_DACCON_FIFORESET,
 479             dev->iobase + PCI224_DACCON);
 480}
 481
 482/*
 483 * Handles start of acquisition for the AO subdevice.
 484 */
 485static void pci224_ao_start(struct comedi_device *dev,
 486                            struct comedi_subdevice *s)
 487{
 488        struct pci224_private *devpriv = dev->private;
 489        struct comedi_cmd *cmd = &s->async->cmd;
 490        unsigned long flags;
 491
 492        set_bit(AO_CMD_STARTED, &devpriv->state);
 493
 494        /* Enable interrupts. */
 495        spin_lock_irqsave(&devpriv->ao_spinlock, flags);
 496        if (cmd->stop_src == TRIG_EXT)
 497                devpriv->intsce = PCI224_INTR_EXT | PCI224_INTR_DAC;
 498        else
 499                devpriv->intsce = PCI224_INTR_DAC;
 500
 501        outb(devpriv->intsce, devpriv->iobase1 + PCI224_INT_SCE);
 502        spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
 503}
 504
 505/*
 506 * Handles interrupts from the DAC FIFO.
 507 */
 508static void pci224_ao_handle_fifo(struct comedi_device *dev,
 509                                  struct comedi_subdevice *s)
 510{
 511        struct pci224_private *devpriv = dev->private;
 512        struct comedi_cmd *cmd = &s->async->cmd;
 513        unsigned int num_scans = comedi_nscans_left(s, 0);
 514        unsigned int room;
 515        unsigned short dacstat;
 516        unsigned int i, n;
 517
 518        /* Determine how much room is in the FIFO (in samples). */
 519        dacstat = inw(dev->iobase + PCI224_DACCON);
 520        switch (dacstat & PCI224_DACCON_FIFOFL_MASK) {
 521        case PCI224_DACCON_FIFOFL_EMPTY:
 522                room = PCI224_FIFO_ROOM_EMPTY;
 523                if (cmd->stop_src == TRIG_COUNT &&
 524                    s->async->scans_done >= cmd->stop_arg) {
 525                        /* FIFO empty at end of counted acquisition. */
 526                        s->async->events |= COMEDI_CB_EOA;
 527                        comedi_handle_events(dev, s);
 528                        return;
 529                }
 530                break;
 531        case PCI224_DACCON_FIFOFL_ONETOHALF:
 532                room = PCI224_FIFO_ROOM_ONETOHALF;
 533                break;
 534        case PCI224_DACCON_FIFOFL_HALFTOFULL:
 535                room = PCI224_FIFO_ROOM_HALFTOFULL;
 536                break;
 537        default:
 538                room = PCI224_FIFO_ROOM_FULL;
 539                break;
 540        }
 541        if (room >= PCI224_FIFO_ROOM_ONETOHALF) {
 542                /* FIFO is less than half-full. */
 543                if (num_scans == 0) {
 544                        /* Nothing left to put in the FIFO. */
 545                        dev_err(dev->class_dev, "AO buffer underrun\n");
 546                        s->async->events |= COMEDI_CB_OVERFLOW;
 547                }
 548        }
 549        /* Determine how many new scans can be put in the FIFO. */
 550        room /= cmd->chanlist_len;
 551
 552        /* Determine how many scans to process. */
 553        if (num_scans > room)
 554                num_scans = room;
 555
 556        /* Process scans. */
 557        for (n = 0; n < num_scans; n++) {
 558                comedi_buf_read_samples(s, &devpriv->ao_scan_vals[0],
 559                                        cmd->chanlist_len);
 560                for (i = 0; i < cmd->chanlist_len; i++) {
 561                        outw(devpriv->ao_scan_vals[devpriv->ao_scan_order[i]],
 562                             dev->iobase + PCI224_DACDATA);
 563                }
 564        }
 565        if (cmd->stop_src == TRIG_COUNT &&
 566            s->async->scans_done >= cmd->stop_arg) {
 567                /*
 568                 * Change FIFO interrupt trigger level to wait
 569                 * until FIFO is empty.
 570                 */
 571                devpriv->daccon = COMBINE(devpriv->daccon,
 572                                          PCI224_DACCON_FIFOINTR_EMPTY,
 573                                          PCI224_DACCON_FIFOINTR_MASK);
 574                outw(devpriv->daccon, dev->iobase + PCI224_DACCON);
 575        }
 576        if ((devpriv->daccon & PCI224_DACCON_TRIG_MASK) ==
 577            PCI224_DACCON_TRIG_NONE) {
 578                unsigned short trig;
 579
 580                /*
 581                 * This is the initial DAC FIFO interrupt at the
 582                 * start of the acquisition.  The DAC's scan trigger
 583                 * has been set to 'none' up until now.
 584                 *
 585                 * Now that data has been written to the FIFO, the
 586                 * DAC's scan trigger source can be set to the
 587                 * correct value.
 588                 *
 589                 * BUG: The first scan will be triggered immediately
 590                 * if the scan trigger source is at logic level 1.
 591                 */
 592                if (cmd->scan_begin_src == TRIG_TIMER) {
 593                        trig = PCI224_DACCON_TRIG_Z2CT0;
 594                } else {
 595                        /* cmd->scan_begin_src == TRIG_EXT */
 596                        if (cmd->scan_begin_arg & CR_INVERT)
 597                                trig = PCI224_DACCON_TRIG_EXTN;
 598                        else
 599                                trig = PCI224_DACCON_TRIG_EXTP;
 600                }
 601                devpriv->daccon =
 602                    COMBINE(devpriv->daccon, trig, PCI224_DACCON_TRIG_MASK);
 603                outw(devpriv->daccon, dev->iobase + PCI224_DACCON);
 604        }
 605
 606        comedi_handle_events(dev, s);
 607}
 608
 609static int pci224_ao_inttrig_start(struct comedi_device *dev,
 610                                   struct comedi_subdevice *s,
 611                                   unsigned int trig_num)
 612{
 613        struct comedi_cmd *cmd = &s->async->cmd;
 614
 615        if (trig_num != cmd->start_arg)
 616                return -EINVAL;
 617
 618        s->async->inttrig = NULL;
 619        pci224_ao_start(dev, s);
 620
 621        return 1;
 622}
 623
 624static int pci224_ao_check_chanlist(struct comedi_device *dev,
 625                                    struct comedi_subdevice *s,
 626                                    struct comedi_cmd *cmd)
 627{
 628        const struct pci224_board *board = dev->board_ptr;
 629        unsigned int range_check_0;
 630        unsigned int chan_mask = 0;
 631        int i;
 632
 633        range_check_0 = board->ao_range_check[CR_RANGE(cmd->chanlist[0])];
 634        for (i = 0; i < cmd->chanlist_len; i++) {
 635                unsigned int chan = CR_CHAN(cmd->chanlist[i]);
 636
 637                if (chan_mask & (1 << chan)) {
 638                        dev_dbg(dev->class_dev,
 639                                "%s: entries in chanlist must contain no duplicate channels\n",
 640                                __func__);
 641                        return -EINVAL;
 642                }
 643                chan_mask |= 1 << chan;
 644
 645                if (board->ao_range_check[CR_RANGE(cmd->chanlist[i])] !=
 646                    range_check_0) {
 647                        dev_dbg(dev->class_dev,
 648                                "%s: entries in chanlist have incompatible ranges\n",
 649                                __func__);
 650                        return -EINVAL;
 651                }
 652        }
 653
 654        return 0;
 655}
 656
 657#define MAX_SCAN_PERIOD         0xFFFFFFFFU
 658#define MIN_SCAN_PERIOD         2500
 659#define CONVERT_PERIOD          625
 660
 661/*
 662 * 'do_cmdtest' function for AO subdevice.
 663 */
 664static int
 665pci224_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
 666                  struct comedi_cmd *cmd)
 667{
 668        int err = 0;
 669        unsigned int arg;
 670
 671        /* Step 1 : check if triggers are trivially valid */
 672
 673        err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT | TRIG_EXT);
 674        err |= comedi_check_trigger_src(&cmd->scan_begin_src,
 675                                        TRIG_EXT | TRIG_TIMER);
 676        err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
 677        err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 678        err |= comedi_check_trigger_src(&cmd->stop_src,
 679                                        TRIG_COUNT | TRIG_EXT | TRIG_NONE);
 680
 681        if (err)
 682                return 1;
 683
 684        /* Step 2a : make sure trigger sources are unique */
 685
 686        err |= comedi_check_trigger_is_unique(cmd->start_src);
 687        err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
 688        err |= comedi_check_trigger_is_unique(cmd->stop_src);
 689
 690        /* Step 2b : and mutually compatible */
 691
 692        /*
 693         * There's only one external trigger signal (which makes these
 694         * tests easier).  Only one thing can use it.
 695         */
 696        arg = 0;
 697        if (cmd->start_src & TRIG_EXT)
 698                arg++;
 699        if (cmd->scan_begin_src & TRIG_EXT)
 700                arg++;
 701        if (cmd->stop_src & TRIG_EXT)
 702                arg++;
 703        if (arg > 1)
 704                err |= -EINVAL;
 705
 706        if (err)
 707                return 2;
 708
 709        /* Step 3: check if arguments are trivially valid */
 710
 711        switch (cmd->start_src) {
 712        case TRIG_INT:
 713                err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
 714                break;
 715        case TRIG_EXT:
 716                /* Force to external trigger 0. */
 717                if (cmd->start_arg & ~CR_FLAGS_MASK) {
 718                        cmd->start_arg =
 719                            COMBINE(cmd->start_arg, 0, ~CR_FLAGS_MASK);
 720                        err |= -EINVAL;
 721                }
 722                /* The only flag allowed is CR_EDGE, which is ignored. */
 723                if (cmd->start_arg & CR_FLAGS_MASK & ~CR_EDGE) {
 724                        cmd->start_arg = COMBINE(cmd->start_arg, 0,
 725                                                 CR_FLAGS_MASK & ~CR_EDGE);
 726                        err |= -EINVAL;
 727                }
 728                break;
 729        }
 730
 731        switch (cmd->scan_begin_src) {
 732        case TRIG_TIMER:
 733                err |= comedi_check_trigger_arg_max(&cmd->scan_begin_arg,
 734                                                    MAX_SCAN_PERIOD);
 735
 736                arg = cmd->chanlist_len * CONVERT_PERIOD;
 737                if (arg < MIN_SCAN_PERIOD)
 738                        arg = MIN_SCAN_PERIOD;
 739                err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, arg);
 740                break;
 741        case TRIG_EXT:
 742                /* Force to external trigger 0. */
 743                if (cmd->scan_begin_arg & ~CR_FLAGS_MASK) {
 744                        cmd->scan_begin_arg =
 745                            COMBINE(cmd->scan_begin_arg, 0, ~CR_FLAGS_MASK);
 746                        err |= -EINVAL;
 747                }
 748                /* Only allow flags CR_EDGE and CR_INVERT.  Ignore CR_EDGE. */
 749                if (cmd->scan_begin_arg & CR_FLAGS_MASK &
 750                    ~(CR_EDGE | CR_INVERT)) {
 751                        cmd->scan_begin_arg =
 752                            COMBINE(cmd->scan_begin_arg, 0,
 753                                    CR_FLAGS_MASK & ~(CR_EDGE | CR_INVERT));
 754                        err |= -EINVAL;
 755                }
 756                break;
 757        }
 758
 759        err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
 760        err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
 761                                           cmd->chanlist_len);
 762
 763        switch (cmd->stop_src) {
 764        case TRIG_COUNT:
 765                err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
 766                break;
 767        case TRIG_EXT:
 768                /* Force to external trigger 0. */
 769                if (cmd->stop_arg & ~CR_FLAGS_MASK) {
 770                        cmd->stop_arg =
 771                            COMBINE(cmd->stop_arg, 0, ~CR_FLAGS_MASK);
 772                        err |= -EINVAL;
 773                }
 774                /* The only flag allowed is CR_EDGE, which is ignored. */
 775                if (cmd->stop_arg & CR_FLAGS_MASK & ~CR_EDGE) {
 776                        cmd->stop_arg =
 777                            COMBINE(cmd->stop_arg, 0, CR_FLAGS_MASK & ~CR_EDGE);
 778                }
 779                break;
 780        case TRIG_NONE:
 781                err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
 782                break;
 783        }
 784
 785        if (err)
 786                return 3;
 787
 788        /* Step 4: fix up any arguments. */
 789
 790        if (cmd->scan_begin_src == TRIG_TIMER) {
 791                arg = cmd->scan_begin_arg;
 792                /* Use two timers. */
 793                comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
 794                err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
 795        }
 796
 797        if (err)
 798                return 4;
 799
 800        /* Step 5: check channel list if it exists */
 801        if (cmd->chanlist && cmd->chanlist_len > 0)
 802                err |= pci224_ao_check_chanlist(dev, s, cmd);
 803
 804        if (err)
 805                return 5;
 806
 807        return 0;
 808}
 809
 810static void pci224_ao_start_pacer(struct comedi_device *dev,
 811                                  struct comedi_subdevice *s)
 812{
 813        struct pci224_private *devpriv = dev->private;
 814
 815        /*
 816         * The output of timer Z2-0 will be used as the scan trigger
 817         * source.
 818         */
 819        /* Make sure Z2-0 is gated on.  */
 820        outb(GAT_CONFIG(0, GAT_VCC), devpriv->iobase1 + PCI224_ZGAT_SCE);
 821        /* Cascading with Z2-2. */
 822        /* Make sure Z2-2 is gated on.  */
 823        outb(GAT_CONFIG(2, GAT_VCC), devpriv->iobase1 + PCI224_ZGAT_SCE);
 824        /* Z2-2 needs 10 MHz clock. */
 825        outb(CLK_CONFIG(2, CLK_10MHZ), devpriv->iobase1 + PCI224_ZCLK_SCE);
 826        /* Z2-0 is clocked from Z2-2's output. */
 827        outb(CLK_CONFIG(0, CLK_OUTNM1), devpriv->iobase1 + PCI224_ZCLK_SCE);
 828
 829        comedi_8254_pacer_enable(dev->pacer, 2, 0, false);
 830}
 831
 832static int pci224_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 833{
 834        const struct pci224_board *board = dev->board_ptr;
 835        struct pci224_private *devpriv = dev->private;
 836        struct comedi_cmd *cmd = &s->async->cmd;
 837        int range;
 838        unsigned int i, j;
 839        unsigned int ch;
 840        unsigned int rank;
 841        unsigned long flags;
 842
 843        /* Cannot handle null/empty chanlist. */
 844        if (!cmd->chanlist || cmd->chanlist_len == 0)
 845                return -EINVAL;
 846
 847        /* Determine which channels are enabled and their load order.  */
 848        devpriv->ao_enab = 0;
 849
 850        for (i = 0; i < cmd->chanlist_len; i++) {
 851                ch = CR_CHAN(cmd->chanlist[i]);
 852                devpriv->ao_enab |= 1U << ch;
 853                rank = 0;
 854                for (j = 0; j < cmd->chanlist_len; j++) {
 855                        if (CR_CHAN(cmd->chanlist[j]) < ch)
 856                                rank++;
 857                }
 858                devpriv->ao_scan_order[rank] = i;
 859        }
 860
 861        /* Set enabled channels. */
 862        outw(devpriv->ao_enab, dev->iobase + PCI224_DACCEN);
 863
 864        /* Determine range and polarity.  All channels the same.  */
 865        range = CR_RANGE(cmd->chanlist[0]);
 866
 867        /*
 868         * Set DAC range and polarity.
 869         * Set DAC scan trigger source to 'none'.
 870         * Set DAC FIFO interrupt trigger level to 'not half full'.
 871         * Reset DAC FIFO.
 872         *
 873         * N.B. DAC FIFO interrupts are currently disabled.
 874         */
 875        devpriv->daccon =
 876            COMBINE(devpriv->daccon,
 877                    board->ao_hwrange[range] | PCI224_DACCON_TRIG_NONE |
 878                    PCI224_DACCON_FIFOINTR_NHALF,
 879                    PCI224_DACCON_POLAR_MASK | PCI224_DACCON_VREF_MASK |
 880                    PCI224_DACCON_TRIG_MASK | PCI224_DACCON_FIFOINTR_MASK);
 881        outw(devpriv->daccon | PCI224_DACCON_FIFORESET,
 882             dev->iobase + PCI224_DACCON);
 883
 884        if (cmd->scan_begin_src == TRIG_TIMER) {
 885                comedi_8254_update_divisors(dev->pacer);
 886                pci224_ao_start_pacer(dev, s);
 887        }
 888
 889        spin_lock_irqsave(&devpriv->ao_spinlock, flags);
 890        if (cmd->start_src == TRIG_INT) {
 891                s->async->inttrig = pci224_ao_inttrig_start;
 892        } else {        /* TRIG_EXT */
 893                /* Enable external interrupt trigger to start acquisition. */
 894                devpriv->intsce |= PCI224_INTR_EXT;
 895                outb(devpriv->intsce, devpriv->iobase1 + PCI224_INT_SCE);
 896        }
 897        spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
 898
 899        return 0;
 900}
 901
 902/*
 903 * 'cancel' function for AO subdevice.
 904 */
 905static int pci224_ao_cancel(struct comedi_device *dev,
 906                            struct comedi_subdevice *s)
 907{
 908        pci224_ao_stop(dev, s);
 909        return 0;
 910}
 911
 912/*
 913 * 'munge' data for AO command.
 914 */
 915static void
 916pci224_ao_munge(struct comedi_device *dev, struct comedi_subdevice *s,
 917                void *data, unsigned int num_bytes, unsigned int chan_index)
 918{
 919        const struct pci224_board *board = dev->board_ptr;
 920        struct comedi_cmd *cmd = &s->async->cmd;
 921        unsigned short *array = data;
 922        unsigned int length = num_bytes / sizeof(*array);
 923        unsigned int offset;
 924        unsigned int shift;
 925        unsigned int i;
 926
 927        /* The hardware expects 16-bit numbers. */
 928        shift = 16 - board->ao_bits;
 929        /* Channels will be all bipolar or all unipolar. */
 930        if ((board->ao_hwrange[CR_RANGE(cmd->chanlist[0])] &
 931             PCI224_DACCON_POLAR_MASK) == PCI224_DACCON_POLAR_UNI) {
 932                /* Unipolar */
 933                offset = 0;
 934        } else {
 935                /* Bipolar */
 936                offset = 32768;
 937        }
 938        /* Munge the data. */
 939        for (i = 0; i < length; i++)
 940                array[i] = (array[i] << shift) - offset;
 941}
 942
 943/*
 944 * Interrupt handler.
 945 */
 946static irqreturn_t pci224_interrupt(int irq, void *d)
 947{
 948        struct comedi_device *dev = d;
 949        struct pci224_private *devpriv = dev->private;
 950        struct comedi_subdevice *s = dev->write_subdev;
 951        struct comedi_cmd *cmd;
 952        unsigned char intstat, valid_intstat;
 953        unsigned char curenab;
 954        int retval = 0;
 955        unsigned long flags;
 956
 957        intstat = inb(devpriv->iobase1 + PCI224_INT_SCE) & 0x3F;
 958        if (intstat) {
 959                retval = 1;
 960                spin_lock_irqsave(&devpriv->ao_spinlock, flags);
 961                valid_intstat = devpriv->intsce & intstat;
 962                /* Temporarily disable interrupt sources. */
 963                curenab = devpriv->intsce & ~intstat;
 964                outb(curenab, devpriv->iobase1 + PCI224_INT_SCE);
 965                devpriv->intr_running = 1;
 966                devpriv->intr_cpuid = THISCPU;
 967                spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
 968                if (valid_intstat) {
 969                        cmd = &s->async->cmd;
 970                        if (valid_intstat & PCI224_INTR_EXT) {
 971                                devpriv->intsce &= ~PCI224_INTR_EXT;
 972                                if (cmd->start_src == TRIG_EXT)
 973                                        pci224_ao_start(dev, s);
 974                                else if (cmd->stop_src == TRIG_EXT)
 975                                        pci224_ao_stop(dev, s);
 976                        }
 977                        if (valid_intstat & PCI224_INTR_DAC)
 978                                pci224_ao_handle_fifo(dev, s);
 979                }
 980                /* Reenable interrupt sources. */
 981                spin_lock_irqsave(&devpriv->ao_spinlock, flags);
 982                if (curenab != devpriv->intsce) {
 983                        outb(devpriv->intsce,
 984                             devpriv->iobase1 + PCI224_INT_SCE);
 985                }
 986                devpriv->intr_running = 0;
 987                spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
 988        }
 989        return IRQ_RETVAL(retval);
 990}
 991
 992static int
 993pci224_auto_attach(struct comedi_device *dev, unsigned long context_model)
 994{
 995        struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
 996        const struct pci224_board *board = NULL;
 997        struct pci224_private *devpriv;
 998        struct comedi_subdevice *s;
 999        unsigned int irq;
1000        int ret;
1001
1002        if (context_model < ARRAY_SIZE(pci224_boards))
1003                board = &pci224_boards[context_model];
1004        if (!board || !board->name) {
1005                dev_err(dev->class_dev,
1006                        "amplc_pci224: BUG! cannot determine board type!\n");
1007                return -EINVAL;
1008        }
1009        dev->board_ptr = board;
1010        dev->board_name = board->name;
1011
1012        dev_info(dev->class_dev, "amplc_pci224: attach pci %s - %s\n",
1013                 pci_name(pci_dev), dev->board_name);
1014
1015        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1016        if (!devpriv)
1017                return -ENOMEM;
1018
1019        ret = comedi_pci_enable(dev);
1020        if (ret)
1021                return ret;
1022
1023        spin_lock_init(&devpriv->ao_spinlock);
1024
1025        devpriv->iobase1 = pci_resource_start(pci_dev, 2);
1026        dev->iobase = pci_resource_start(pci_dev, 3);
1027        irq = pci_dev->irq;
1028
1029        /* Allocate buffer to hold values for AO channel scan. */
1030        devpriv->ao_scan_vals = kmalloc_array(board->ao_chans,
1031                                              sizeof(devpriv->ao_scan_vals[0]),
1032                                              GFP_KERNEL);
1033        if (!devpriv->ao_scan_vals)
1034                return -ENOMEM;
1035
1036        /* Allocate buffer to hold AO channel scan order. */
1037        devpriv->ao_scan_order =
1038                                kmalloc_array(board->ao_chans,
1039                                              sizeof(devpriv->ao_scan_order[0]),
1040                                              GFP_KERNEL);
1041        if (!devpriv->ao_scan_order)
1042                return -ENOMEM;
1043
1044        /* Disable interrupt sources. */
1045        devpriv->intsce = 0;
1046        outb(0, devpriv->iobase1 + PCI224_INT_SCE);
1047
1048        /* Initialize the DAC hardware. */
1049        outw(PCI224_DACCON_GLOBALRESET, dev->iobase + PCI224_DACCON);
1050        outw(0, dev->iobase + PCI224_DACCEN);
1051        outw(0, dev->iobase + PCI224_FIFOSIZ);
1052        devpriv->daccon = PCI224_DACCON_TRIG_SW | PCI224_DACCON_POLAR_BI |
1053                          PCI224_DACCON_FIFOENAB | PCI224_DACCON_FIFOINTR_EMPTY;
1054        outw(devpriv->daccon | PCI224_DACCON_FIFORESET,
1055             dev->iobase + PCI224_DACCON);
1056
1057        dev->pacer = comedi_8254_init(devpriv->iobase1 + PCI224_Z2_BASE,
1058                                      I8254_OSC_BASE_10MHZ, I8254_IO8, 0);
1059        if (!dev->pacer)
1060                return -ENOMEM;
1061
1062        ret = comedi_alloc_subdevices(dev, 1);
1063        if (ret)
1064                return ret;
1065
1066        s = &dev->subdevices[0];
1067        /* Analog output subdevice. */
1068        s->type = COMEDI_SUBD_AO;
1069        s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE;
1070        s->n_chan = board->ao_chans;
1071        s->maxdata = (1 << board->ao_bits) - 1;
1072        s->range_table = board->ao_range;
1073        s->insn_write = pci224_ao_insn_write;
1074        s->len_chanlist = s->n_chan;
1075        dev->write_subdev = s;
1076        s->do_cmd = pci224_ao_cmd;
1077        s->do_cmdtest = pci224_ao_cmdtest;
1078        s->cancel = pci224_ao_cancel;
1079        s->munge = pci224_ao_munge;
1080
1081        ret = comedi_alloc_subdev_readback(s);
1082        if (ret)
1083                return ret;
1084
1085        if (irq) {
1086                ret = request_irq(irq, pci224_interrupt, IRQF_SHARED,
1087                                  dev->board_name, dev);
1088                if (ret < 0) {
1089                        dev_err(dev->class_dev,
1090                                "error! unable to allocate irq %u\n", irq);
1091                        return ret;
1092                }
1093                dev->irq = irq;
1094        }
1095
1096        return 0;
1097}
1098
1099static void pci224_detach(struct comedi_device *dev)
1100{
1101        struct pci224_private *devpriv = dev->private;
1102
1103        comedi_pci_detach(dev);
1104        if (devpriv) {
1105                kfree(devpriv->ao_scan_vals);
1106                kfree(devpriv->ao_scan_order);
1107        }
1108}
1109
1110static struct comedi_driver amplc_pci224_driver = {
1111        .driver_name    = "amplc_pci224",
1112        .module         = THIS_MODULE,
1113        .detach         = pci224_detach,
1114        .auto_attach    = pci224_auto_attach,
1115        .board_name     = &pci224_boards[0].name,
1116        .offset         = sizeof(struct pci224_board),
1117        .num_names      = ARRAY_SIZE(pci224_boards),
1118};
1119
1120static int amplc_pci224_pci_probe(struct pci_dev *dev,
1121                                  const struct pci_device_id *id)
1122{
1123        return comedi_pci_auto_config(dev, &amplc_pci224_driver,
1124                                      id->driver_data);
1125}
1126
1127static const struct pci_device_id amplc_pci224_pci_table[] = {
1128        { PCI_VDEVICE(AMPLICON, 0x0007), pci224_model },
1129        { PCI_VDEVICE(AMPLICON, 0x0008), pci234_model },
1130        { 0 }
1131};
1132MODULE_DEVICE_TABLE(pci, amplc_pci224_pci_table);
1133
1134static struct pci_driver amplc_pci224_pci_driver = {
1135        .name           = "amplc_pci224",
1136        .id_table       = amplc_pci224_pci_table,
1137        .probe          = amplc_pci224_pci_probe,
1138        .remove         = comedi_pci_auto_unconfig,
1139};
1140module_comedi_pci_driver(amplc_pci224_driver, amplc_pci224_pci_driver);
1141
1142MODULE_AUTHOR("Comedi http://www.comedi.org");
1143MODULE_DESCRIPTION("Comedi driver for Amplicon PCI224 and PCI234 AO boards");
1144MODULE_LICENSE("GPL");
1145
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