/*
    comedi/drivers/cb_pcidas.c

    Developed by Ivan Martinez and Frank Mori Hess, with valuable help from
    David Schleef and the rest of the Comedi developers comunity.

    Copyright (C) 2001-2003 Ivan Martinez <imr@oersted.dtu.dk>
    Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>

    COMEDI - Linux Control and Measurement Device Interface
    Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

************************************************************************
*/
/*
Driver: cb_pcidas
Description: MeasurementComputing PCI-DAS series
  with the AMCC S5933 PCI controller
Author: Ivan Martinez <imr@oersted.dtu.dk>,
  Frank Mori Hess <fmhess@users.sourceforge.net>
Updated: 2003-3-11
Devices: [Measurement Computing] PCI-DAS1602/16 (cb_pcidas),
  PCI-DAS1602/16jr, PCI-DAS1602/12, PCI-DAS1200, PCI-DAS1200jr,
  PCI-DAS1000, PCI-DAS1001, PCI_DAS1002

Status:
  There are many reports of the driver being used with most of the
  supported cards. Despite no detailed log is maintained, it can
  be said that the driver is quite tested and stable.

  The boards may be autocalibrated using the comedi_calibrate
  utility.

Configuration options:
  [0] - PCI bus of device (optional)
  [1] - PCI slot of device (optional)
  If bus/slot is not specified, the first supported
  PCI device found will be used.

For commands, the scanned channels must be consecutive
(i.e. 4-5-6-7, 2-3-4,...), and must all have the same
range and aref.

AI Triggering:
   For start_src == TRIG_EXT, the A/D EXTERNAL TRIGGER IN (pin 45) is used.
   For 1602 series, the start_arg is interpreted as follows:
     start_arg == 0                   => gated trigger (level high)
     start_arg == CR_INVERT           => gated trigger (level low)
     start_arg == CR_EDGE             => Rising edge
     start_arg == CR_EDGE | CR_INVERT => Falling edge
   For the other boards the trigger will be done on rising edge
*/
/*

TODO:

analog triggering on 1602 series
*/

#include "../comedidev.h"
#include <linux/delay.h>
#include <linux/interrupt.h>

#include "8253.h"
#include "8255.h"
#include "amcc_s5933.h"
#include "comedi_fc.h"

/* PCI vendor number of ComputerBoards/MeasurementComputing */
#define PCI_VENDOR_ID_CB        0x1307

#define TIMER_BASE              100     /* 10MHz master clock */
#define AI_BUFFER_SIZE          1024    /* max ai fifo size */
#define AO_BUFFER_SIZE          1024    /* max ao fifo size */
#define NUM_CHANNELS_8800       8
#define NUM_CHANNELS_7376       1
#define NUM_CHANNELS_8402       2
#define NUM_CHANNELS_DAC08      1

/* Control/Status registers */
#define INT_ADCFIFO             0       /* INTERRUPT / ADC FIFO register */
#define   INT_EOS               0x1     /* int end of scan */
#define   INT_FHF               0x2     /* int fifo half full */
#define   INT_FNE               0x3     /* int fifo not empty */
#define   INT_MASK              0x3     /* mask of int select bits */
#define   INTE                  0x4     /* int enable */
#define   DAHFIE                0x8     /* dac half full int enable */
#define   EOAIE                 0x10    /* end of acq. int enable */
#define   DAHFI                 0x20    /* dac half full status / clear */
#define   EOAI                  0x40    /* end of acq. int status / clear */
#define   INT                   0x80    /* int status / clear */
#define   EOBI                  0x200   /* end of burst int status */
#define   ADHFI                 0x400   /* half-full int status */
#define   ADNEI                 0x800   /* fifo not empty int status (latch) */
#define   ADNE                  0x1000  /* fifo not empty status (realtime) */
#define   DAEMIE                0x1000  /* dac empty int enable */
#define   LADFUL                0x2000  /* fifo overflow / clear */
#define   DAEMI                 0x4000  /* dac fifo empty int status / clear */

#define ADCMUX_CONT             2       /* ADC CHANNEL MUX AND CONTROL reg */
#define   BEGIN_SCAN(x)         ((x) & 0xf)
#define   END_SCAN(x)           (((x) & 0xf) << 4)
#define   GAIN_BITS(x)          (((x) & 0x3) << 8)
#define   UNIP                  0x800   /* Analog front-end unipolar mode */
#define   SE                    0x400   /* Inputs in single-ended mode */
#define   PACER_MASK            0x3000  /* pacer source bits */
#define   PACER_INT             0x1000  /* int. pacer */
#define   PACER_EXT_FALL        0x2000  /* ext. falling edge */
#define   PACER_EXT_RISE        0x3000  /* ext. rising edge */
#define   EOC                   0x4000  /* adc not busy */

#define TRIG_CONTSTAT            4      /* TRIGGER CONTROL/STATUS register */
#define   SW_TRIGGER            0x1     /* software start trigger */
#define   EXT_TRIGGER           0x2     /* ext. start trigger */
#define   ANALOG_TRIGGER        0x3     /* ext. analog trigger */
#define   TRIGGER_MASK          0x3     /* start trigger mask */
#define   TGPOL                 0x04    /* invert trigger (1602 only) */
#define   TGSEL                 0x08    /* edge/level trigerred (1602 only) */
#define   TGEN                  0x10    /* enable external start trigger */
#define   BURSTE                0x20    /* burst mode enable */
#define   XTRCL                 0x80    /* clear external trigger */

#define CALIBRATION_REG         6       /* CALIBRATION register */
#define   SELECT_8800_BIT       0x100   /* select 8800 caldac */
#define   SELECT_TRIMPOT_BIT    0x200   /* select ad7376 trim pot */
#define   SELECT_DAC08_BIT      0x400   /* select dac08 caldac */
#define   CAL_SRC_BITS(x)       (((x) & 0x7) << 11)
#define   CAL_EN_BIT            0x4000  /* calibration source enable */
#define   SERIAL_DATA_IN_BIT    0x8000  /* serial data bit going to caldac */

#define DAC_CSR                 0x8     /* dac control and status register */
#define   DACEN                 0x02    /* dac enable */
#define   DAC_MODE_UPDATE_BOTH  0x80    /* update both dacs */

static inline unsigned int DAC_RANGE(unsigned int channel, unsigned int range)
{
        return (range & 0x3) << (8 + 2 * (channel & 0x1));
}

static inline unsigned int DAC_RANGE_MASK(unsigned int channel)
{
        return 0x3 << (8 + 2 * (channel & 0x1));
};

/* bits for 1602 series only */
#define   DAC_EMPTY             0x1     /* fifo empty, read, write clear */
#define   DAC_START             0x4     /* start/arm fifo operations */
#define   DAC_PACER_MASK        0x18    /* bits that set pacer source */
#define   DAC_PACER_INT         0x8     /* int. pacing */
#define   DAC_PACER_EXT_FALL    0x10    /* ext. pacing, falling edge */
#define   DAC_PACER_EXT_RISE    0x18    /* ext. pacing, rising edge */

static inline unsigned int DAC_CHAN_EN(unsigned int channel)
{
        return 1 << (5 + (channel & 0x1));      /*  enable channel 0 or 1 */
};

/* analog input fifo */
#define ADCDATA                 0       /* ADC DATA register */
#define ADCFIFOCLR              2       /* ADC FIFO CLEAR */

/* pacer, counter, dio registers */
#define ADC8254                 0
#define DIO_8255                4
#define DAC8254                 8

/* analog output registers for 100x, 1200 series */
static inline unsigned int DAC_DATA_REG(unsigned int channel)
{
        return 2 * (channel & 0x1);
}

/* analog output registers for 1602 series*/
#define DACDATA                 0       /* DAC DATA register */
#define DACFIFOCLR              2       /* DAC FIFO CLEAR */

#define IS_UNIPOLAR             0x4     /* unipolar range mask */

/* analog input ranges for most boards */
static const struct comedi_lrange cb_pcidas_ranges = {
        8,
        {
         BIP_RANGE(10),
         BIP_RANGE(5),
         BIP_RANGE(2.5),
         BIP_RANGE(1.25),
         UNI_RANGE(10),
         UNI_RANGE(5),
         UNI_RANGE(2.5),
         UNI_RANGE(1.25)
         }
};

/* pci-das1001 input ranges */
static const struct comedi_lrange cb_pcidas_alt_ranges = {
        8,
        {
         BIP_RANGE(10),
         BIP_RANGE(1),
         BIP_RANGE(0.1),
         BIP_RANGE(0.01),
         UNI_RANGE(10),
         UNI_RANGE(1),
         UNI_RANGE(0.1),
         UNI_RANGE(0.01)
         }
};

/* analog output ranges */
static const struct comedi_lrange cb_pcidas_ao_ranges = {
        4,
        {
         BIP_RANGE(5),
         BIP_RANGE(10),
         UNI_RANGE(5),
         UNI_RANGE(10),
         }
};

enum trimpot_model {
        AD7376,
        AD8402,
};

struct cb_pcidas_board {
        const char *name;
        unsigned short device_id;
        int ai_nchan;           /*  Inputs in single-ended mode */
        int ai_bits;            /*  analog input resolution */
        int ai_speed;           /*  fastest conversion period in ns */
        int ao_nchan;           /*  number of analog out channels */
        int has_ao_fifo;        /*  analog output has fifo */
        int ao_scan_speed;      /*  analog output scan speed for 1602 series */
        int fifo_size;          /*  number of samples fifo can hold */
        const struct comedi_lrange *ranges;
        enum trimpot_model trimpot;
        unsigned has_dac08:1;
        unsigned is_1602:1;
};

static const struct cb_pcidas_board cb_pcidas_boards[] = {
        {
                .name           = "pci-das1602/16",
                .device_id      = 0x1,
                .ai_nchan       = 16,
                .ai_bits        = 16,
                .ai_speed       = 5000,
                .ao_nchan       = 2,
                .has_ao_fifo    = 1,
                .ao_scan_speed  = 10000,
                .fifo_size      = 512,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD8402,
                .has_dac08      = 1,
                .is_1602        = 1,
        }, {
                .name           = "pci-das1200",
                .device_id      = 0xF,
                .ai_nchan       = 16,
                .ai_bits        = 12,
                .ai_speed       = 3200,
                .ao_nchan       = 2,
                .fifo_size      = 1024,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD7376,
        }, {
                .name           = "pci-das1602/12",
                .device_id      = 0x10,
                .ai_nchan       = 16,
                .ai_bits        = 12,
                .ai_speed       = 3200,
                .ao_nchan       = 2,
                .has_ao_fifo    = 1,
                .ao_scan_speed  = 4000,
                .fifo_size      = 1024,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD7376,
                .is_1602        = 1,
        }, {
                .name           = "pci-das1200/jr",
                .device_id      = 0x19,
                .ai_nchan       = 16,
                .ai_bits        = 12,
                .ai_speed       = 3200,
                .fifo_size      = 1024,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD7376,
        }, {
                .name           = "pci-das1602/16/jr",
                .device_id      = 0x1C,
                .ai_nchan       = 16,
                .ai_bits        = 16,
                .ai_speed       = 5000,
                .fifo_size      = 512,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD8402,
                .has_dac08      = 1,
                .is_1602        = 1,
        }, {
                .name           = "pci-das1000",
                .device_id      = 0x4C,
                .ai_nchan       = 16,
                .ai_bits        = 12,
                .ai_speed       = 4000,
                .fifo_size      = 1024,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD7376,
        }, {
                .name           = "pci-das1001",
                .device_id      = 0x1a,
                .ai_nchan       = 16,
                .ai_bits        = 12,
                .ai_speed       = 6800,
                .ao_nchan       = 2,
                .fifo_size      = 1024,
                .ranges         = &cb_pcidas_alt_ranges,
                .trimpot        = AD7376,
        }, {
                .name           = "pci-das1002",
                .device_id      = 0x1b,
                .ai_nchan       = 16,
                .ai_bits        = 12,
                .ai_speed       = 6800,
                .ao_nchan       = 2,
                .fifo_size      = 1024,
                .ranges         = &cb_pcidas_ranges,
                .trimpot        = AD7376,
        },
};

struct cb_pcidas_private {
        /* base addresses */
        unsigned long s5933_config;
        unsigned long control_status;
        unsigned long adc_fifo;
        unsigned long pacer_counter_dio;
        unsigned long ao_registers;
        /* divisors of master clock for analog input pacing */
        unsigned int divisor1;
        unsigned int divisor2;
        /* number of analog input samples remaining */
        unsigned int count;
        /* bits to write to registers */
        unsigned int adc_fifo_bits;
        unsigned int s5933_intcsr_bits;
        unsigned int ao_control_bits;
        /* fifo buffers */
        short ai_buffer[AI_BUFFER_SIZE];
        short ao_buffer[AO_BUFFER_SIZE];
        /* divisors of master clock for analog output pacing */
        unsigned int ao_divisor1;
        unsigned int ao_divisor2;
        /* number of analog output samples remaining */
        unsigned int ao_count;
        /* cached values for readback */
        int ao_value[2];
        unsigned int caldac_value[NUM_CHANNELS_8800];
        unsigned int trimpot_value[NUM_CHANNELS_8402];
        unsigned int dac08_value;
        unsigned int calibration_source;
};

static inline unsigned int cal_enable_bits(struct comedi_device *dev)
{
        struct cb_pcidas_private *devpriv = dev->private;

        return CAL_EN_BIT | CAL_SRC_BITS(devpriv->calibration_source);
}

static int cb_pcidas_ai_rinsn(struct comedi_device *dev,
                              struct comedi_subdevice *s,
                              struct comedi_insn *insn, unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned int chan = CR_CHAN(insn->chanspec);
        unsigned int range = CR_RANGE(insn->chanspec);
        unsigned int aref = CR_AREF(insn->chanspec);
        unsigned int bits;
        int n, i;

        /* enable calibration input if appropriate */
        if (insn->chanspec & CR_ALT_SOURCE) {
                outw(cal_enable_bits(dev),
                     devpriv->control_status + CALIBRATION_REG);
                chan = 0;
        } else {
                outw(0, devpriv->control_status + CALIBRATION_REG);
        }

        /* set mux limits and gain */
        bits = BEGIN_SCAN(chan) | END_SCAN(chan) | GAIN_BITS(range);
        /* set unipolar/bipolar */
        if (range & IS_UNIPOLAR)
                bits |= UNIP;
        /* set single-ended/differential */
        if (aref != AREF_DIFF)
                bits |= SE;
        outw(bits, devpriv->control_status + ADCMUX_CONT);

        /* clear fifo */
        outw(0, devpriv->adc_fifo + ADCFIFOCLR);

        /* convert n samples */
        for (n = 0; n < insn->n; n++) {
                /* trigger conversion */
                outw(0, devpriv->adc_fifo + ADCDATA);

                /* wait for conversion to end */
                /* return -ETIMEDOUT if there is a timeout */
                for (i = 0; i < 10000; i++) {
                        if (inw(devpriv->control_status + ADCMUX_CONT) & EOC)
                                break;
                }
                if (i == 10000)
                        return -ETIMEDOUT;

                /* read data */
                data[n] = inw(devpriv->adc_fifo + ADCDATA);
        }

        /* return the number of samples read/written */
        return n;
}

static int ai_config_insn(struct comedi_device *dev, struct comedi_subdevice *s,
                          struct comedi_insn *insn, unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;
        int id = data[0];
        unsigned int source = data[1];

        switch (id) {
        case INSN_CONFIG_ALT_SOURCE:
                if (source >= 8) {
                        dev_err(dev->class_dev,
                                "invalid calibration source: %i\n",
                                source);
                        return -EINVAL;
                }
                devpriv->calibration_source = source;
                break;
        default:
                return -EINVAL;
                break;
        }
        return insn->n;
}

/* analog output insn for pcidas-1000 and 1200 series */
static int cb_pcidas_ao_nofifo_winsn(struct comedi_device *dev,
                                     struct comedi_subdevice *s,
                                     struct comedi_insn *insn,
                                     unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned int chan = CR_CHAN(insn->chanspec);
        unsigned int range = CR_RANGE(insn->chanspec);
        unsigned long flags;

        /* set channel and range */
        spin_lock_irqsave(&dev->spinlock, flags);
        devpriv->ao_control_bits &= (~DAC_MODE_UPDATE_BOTH &
                                     ~DAC_RANGE_MASK(chan));
        devpriv->ao_control_bits |= (DACEN | DAC_RANGE(chan, range));
        outw(devpriv->ao_control_bits, devpriv->control_status + DAC_CSR);
        spin_unlock_irqrestore(&dev->spinlock, flags);

        /* remember value for readback */
        devpriv->ao_value[chan] = data[0];

        /* send data */
        outw(data[0], devpriv->ao_registers + DAC_DATA_REG(chan));

        return insn->n;
}

/* analog output insn for pcidas-1602 series */
static int cb_pcidas_ao_fifo_winsn(struct comedi_device *dev,
                                   struct comedi_subdevice *s,
                                   struct comedi_insn *insn, unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned int chan = CR_CHAN(insn->chanspec);
        unsigned int range = CR_RANGE(insn->chanspec);
        unsigned long flags;

        /* clear dac fifo */
        outw(0, devpriv->ao_registers + DACFIFOCLR);

        /* set channel and range */
        spin_lock_irqsave(&dev->spinlock, flags);
        devpriv->ao_control_bits &= (~DAC_CHAN_EN(0) & ~DAC_CHAN_EN(1) &
                                     ~DAC_RANGE_MASK(chan) & ~DAC_PACER_MASK);
        devpriv->ao_control_bits |= (DACEN | DAC_RANGE(chan, range) |
                                     DAC_CHAN_EN(chan) | DAC_START);
        outw(devpriv->ao_control_bits, devpriv->control_status + DAC_CSR);
        spin_unlock_irqrestore(&dev->spinlock, flags);

        /* remember value for readback */
        devpriv->ao_value[chan] = data[0];

        /* send data */
        outw(data[0], devpriv->ao_registers + DACDATA);

        return insn->n;
}

static int cb_pcidas_ao_readback_insn(struct comedi_device *dev,
                                      struct comedi_subdevice *s,
                                      struct comedi_insn *insn,
                                      unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;

        data[0] = devpriv->ao_value[CR_CHAN(insn->chanspec)];

        return 1;
}

static int wait_for_nvram_ready(unsigned long s5933_base_addr)
{
        static const int timeout = 1000;
        unsigned int i;

        for (i = 0; i < timeout; i++) {
                if ((inb(s5933_base_addr +
                         AMCC_OP_REG_MCSR_NVCMD) & MCSR_NV_BUSY)
                    == 0)
                        return 0;
                udelay(1);
        }
        return -1;
}

static int nvram_read(struct comedi_device *dev, unsigned int address,
                        uint8_t *data)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned long iobase = devpriv->s5933_config;

        if (wait_for_nvram_ready(iobase) < 0)
                return -ETIMEDOUT;

        outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_LOW_ADDR,
             iobase + AMCC_OP_REG_MCSR_NVCMD);
        outb(address & 0xff, iobase + AMCC_OP_REG_MCSR_NVDATA);
        outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_HIGH_ADDR,
             iobase + AMCC_OP_REG_MCSR_NVCMD);
        outb((address >> 8) & 0xff, iobase + AMCC_OP_REG_MCSR_NVDATA);
        outb(MCSR_NV_ENABLE | MCSR_NV_READ, iobase + AMCC_OP_REG_MCSR_NVCMD);

        if (wait_for_nvram_ready(iobase) < 0)
                return -ETIMEDOUT;

        *data = inb(iobase + AMCC_OP_REG_MCSR_NVDATA);

        return 0;
}

static int eeprom_read_insn(struct comedi_device *dev,
                            struct comedi_subdevice *s,
                            struct comedi_insn *insn, unsigned int *data)
{
        uint8_t nvram_data;
        int retval;

        retval = nvram_read(dev, CR_CHAN(insn->chanspec), &nvram_data);
        if (retval < 0)
                return retval;

        data[0] = nvram_data;

        return 1;
}

static void write_calibration_bitstream(struct comedi_device *dev,
                                        unsigned int register_bits,
                                        unsigned int bitstream,
                                        unsigned int bitstream_length)
{
        struct cb_pcidas_private *devpriv = dev->private;
        static const int write_delay = 1;
        unsigned int bit;

        for (bit = 1 << (bitstream_length - 1); bit; bit >>= 1) {
                if (bitstream & bit)
                        register_bits |= SERIAL_DATA_IN_BIT;
                else
                        register_bits &= ~SERIAL_DATA_IN_BIT;
                udelay(write_delay);
                outw(register_bits, devpriv->control_status + CALIBRATION_REG);
        }
}

static int caldac_8800_write(struct comedi_device *dev, unsigned int address,
                             uint8_t value)
{
        struct cb_pcidas_private *devpriv = dev->private;
        static const int num_caldac_channels = 8;
        static const int bitstream_length = 11;
        unsigned int bitstream = ((address & 0x7) << 8) | value;
        static const int caldac_8800_udelay = 1;

        if (address >= num_caldac_channels) {
                comedi_error(dev, "illegal caldac channel");
                return -1;
        }

        if (value == devpriv->caldac_value[address])
                return 1;

        devpriv->caldac_value[address] = value;

        write_calibration_bitstream(dev, cal_enable_bits(dev), bitstream,
                                    bitstream_length);

        udelay(caldac_8800_udelay);
        outw(cal_enable_bits(dev) | SELECT_8800_BIT,
             devpriv->control_status + CALIBRATION_REG);
        udelay(caldac_8800_udelay);
        outw(cal_enable_bits(dev), devpriv->control_status + CALIBRATION_REG);

        return 1;
}

static int caldac_write_insn(struct comedi_device *dev,
                             struct comedi_subdevice *s,
                             struct comedi_insn *insn, unsigned int *data)
{
        const unsigned int channel = CR_CHAN(insn->chanspec);

        return caldac_8800_write(dev, channel, data[0]);
}

static int caldac_read_insn(struct comedi_device *dev,
                            struct comedi_subdevice *s,
                            struct comedi_insn *insn, unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;

        data[0] = devpriv->caldac_value[CR_CHAN(insn->chanspec)];

        return 1;
}

/* 1602/16 pregain offset */
static void dac08_write(struct comedi_device *dev, unsigned int value)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned long cal_reg;

        if (devpriv->dac08_value != value) {
                devpriv->dac08_value = value;

                cal_reg = devpriv->control_status + CALIBRATION_REG;

                value &= 0xff;
                value |= cal_enable_bits(dev);

                /* latch the new value into the caldac */
                outw(value, cal_reg);
                udelay(1);
                outw(value | SELECT_DAC08_BIT, cal_reg);
                udelay(1);
                outw(value, cal_reg);
                udelay(1);
        }
}

static int dac08_write_insn(struct comedi_device *dev,
                            struct comedi_subdevice *s,
                            struct comedi_insn *insn, unsigned int *data)
{
        int i;

        for (i = 0; i < insn->n; i++)
                dac08_write(dev, data[i]);

        return insn->n;
}

static int dac08_read_insn(struct comedi_device *dev,
                           struct comedi_subdevice *s, struct comedi_insn *insn,
                           unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;

        data[0] = devpriv->dac08_value;

        return 1;
}

static int trimpot_7376_write(struct comedi_device *dev, uint8_t value)
{
        struct cb_pcidas_private *devpriv = dev->private;
        static const int bitstream_length = 7;
        unsigned int bitstream = value & 0x7f;
        unsigned int register_bits;
        static const int ad7376_udelay = 1;

        register_bits = cal_enable_bits(dev) | SELECT_TRIMPOT_BIT;
        udelay(ad7376_udelay);
        outw(register_bits, devpriv->control_status + CALIBRATION_REG);

        write_calibration_bitstream(dev, register_bits, bitstream,
                                    bitstream_length);

        udelay(ad7376_udelay);
        outw(cal_enable_bits(dev), devpriv->control_status + CALIBRATION_REG);

        return 0;
}

/* For 1602/16 only
 * ch 0 : adc gain
 * ch 1 : adc postgain offset */
static int trimpot_8402_write(struct comedi_device *dev, unsigned int channel,
                              uint8_t value)
{
        struct cb_pcidas_private *devpriv = dev->private;
        static const int bitstream_length = 10;
        unsigned int bitstream = ((channel & 0x3) << 8) | (value & 0xff);
        unsigned int register_bits;
        static const int ad8402_udelay = 1;

        register_bits = cal_enable_bits(dev) | SELECT_TRIMPOT_BIT;
        udelay(ad8402_udelay);
        outw(register_bits, devpriv->control_status + CALIBRATION_REG);

        write_calibration_bitstream(dev, register_bits, bitstream,
                                    bitstream_length);

        udelay(ad8402_udelay);
        outw(cal_enable_bits(dev), devpriv->control_status + CALIBRATION_REG);

        return 0;
}

static int cb_pcidas_trimpot_write(struct comedi_device *dev,
                                   unsigned int channel, unsigned int value)
{
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;

        if (devpriv->trimpot_value[channel] == value)
                return 1;

        devpriv->trimpot_value[channel] = value;
        switch (thisboard->trimpot) {
        case AD7376:
                trimpot_7376_write(dev, value);
                break;
        case AD8402:
                trimpot_8402_write(dev, channel, value);
                break;
        default:
                comedi_error(dev, "driver bug?");
                return -1;
                break;
        }

        return 1;
}

static int trimpot_write_insn(struct comedi_device *dev,
                              struct comedi_subdevice *s,
                              struct comedi_insn *insn, unsigned int *data)
{
        unsigned int channel = CR_CHAN(insn->chanspec);

        return cb_pcidas_trimpot_write(dev, channel, data[0]);
}

static int trimpot_read_insn(struct comedi_device *dev,
                             struct comedi_subdevice *s,
                             struct comedi_insn *insn, unsigned int *data)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned int channel = CR_CHAN(insn->chanspec);

        data[0] = devpriv->trimpot_value[channel];

        return 1;
}

static int cb_pcidas_ai_cmdtest(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_cmd *cmd)
{
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;
        int err = 0;
        int tmp;
        int i, gain, start_chan;

        /* step 1: trigger sources are trivially valid */

        tmp = cmd->start_src;
        cmd->start_src &= TRIG_NOW | TRIG_EXT;
        if (!cmd->start_src || tmp != cmd->start_src)
                err++;

        tmp = cmd->scan_begin_src;
        cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
        if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
                err++;

        tmp = cmd->convert_src;
        cmd->convert_src &= TRIG_TIMER | TRIG_NOW | TRIG_EXT;
        if (!cmd->convert_src || tmp != cmd->convert_src)
                err++;

        tmp = cmd->scan_end_src;
        cmd->scan_end_src &= TRIG_COUNT;
        if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
                err++;

        tmp = cmd->stop_src;
        cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
        if (!cmd->stop_src || tmp != cmd->stop_src)
                err++;

        if (err)
                return 1;

        /* step 2: trigger sources are unique and mutually compatible */

        if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
                err++;
        if (cmd->scan_begin_src != TRIG_FOLLOW &&
            cmd->scan_begin_src != TRIG_TIMER &&
            cmd->scan_begin_src != TRIG_EXT)
                err++;
        if (cmd->convert_src != TRIG_TIMER &&
            cmd->convert_src != TRIG_EXT && cmd->convert_src != TRIG_NOW)
                err++;
        if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
                err++;

        /*  make sure trigger sources are compatible with each other */
        if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
                err++;
        if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
                err++;
        if (cmd->start_src == TRIG_EXT &&
            (cmd->convert_src == TRIG_EXT || cmd->scan_begin_src == TRIG_EXT))
                err++;

        if (err)
                return 2;

        /* step 3: arguments are trivially compatible */

        switch (cmd->start_src) {
        case TRIG_EXT:
                /* External trigger, only CR_EDGE and CR_INVERT flags allowed */
                if ((cmd->start_arg
                     & (CR_FLAGS_MASK & ~(CR_EDGE | CR_INVERT))) != 0) {
                        cmd->start_arg &=
                            ~(CR_FLAGS_MASK & ~(CR_EDGE | CR_INVERT));
                        err++;
                }
                if (!thisboard->is_1602 && (cmd->start_arg & CR_INVERT)) {
                        cmd->start_arg &= (CR_FLAGS_MASK & ~CR_INVERT);
                        err++;
                }
                break;
        default:
                if (cmd->start_arg != 0) {
                        cmd->start_arg = 0;
                        err++;
                }
                break;
        }

        if (cmd->scan_begin_src == TRIG_TIMER) {
                if (cmd->scan_begin_arg <
                    thisboard->ai_speed * cmd->chanlist_len) {
                        cmd->scan_begin_arg =
                            thisboard->ai_speed * cmd->chanlist_len;
                        err++;
                }
        }
        if (cmd->convert_src == TRIG_TIMER) {
                if (cmd->convert_arg < thisboard->ai_speed) {
                        cmd->convert_arg = thisboard->ai_speed;
                        err++;
                }
        }

        if (cmd->scan_end_arg != cmd->chanlist_len) {
                cmd->scan_end_arg = cmd->chanlist_len;
                err++;
        }
        if (cmd->stop_src == TRIG_NONE) {
                /* TRIG_NONE */
                if (cmd->stop_arg != 0) {
                        cmd->stop_arg = 0;
                        err++;
                }
        }

        if (err)
                return 3;

        /* step 4: fix up any arguments */

        if (cmd->scan_begin_src == TRIG_TIMER) {
                tmp = cmd->scan_begin_arg;
                i8253_cascade_ns_to_timer_2div(TIMER_BASE,
                                               &(devpriv->divisor1),
                                               &(devpriv->divisor2),
                                               &(cmd->scan_begin_arg),
                                               cmd->flags & TRIG_ROUND_MASK);
                if (tmp != cmd->scan_begin_arg)
                        err++;
        }
        if (cmd->convert_src == TRIG_TIMER) {
                tmp = cmd->convert_arg;
                i8253_cascade_ns_to_timer_2div(TIMER_BASE,
                                               &(devpriv->divisor1),
                                               &(devpriv->divisor2),
                                               &(cmd->convert_arg),
                                               cmd->flags & TRIG_ROUND_MASK);
                if (tmp != cmd->convert_arg)
                        err++;
        }

        if (err)
                return 4;

        /*  check channel/gain list against card's limitations */
        if (cmd->chanlist) {
                gain = CR_RANGE(cmd->chanlist[0]);
                start_chan = CR_CHAN(cmd->chanlist[0]);
                for (i = 1; i < cmd->chanlist_len; i++) {
                        if (CR_CHAN(cmd->chanlist[i]) !=
                            (start_chan + i) % s->n_chan) {
                                comedi_error(dev,
                                             "entries in chanlist must be consecutive channels, counting upwards\n");
                                err++;
                        }
                        if (CR_RANGE(cmd->chanlist[i]) != gain) {
                                comedi_error(dev,
                                             "entries in chanlist must all have the same gain\n");
                                err++;
                        }
                }
        }

        if (err)
                return 5;

        return 0;
}

static void cb_pcidas_load_counters(struct comedi_device *dev, unsigned int *ns,
                                    int rounding_flags)
{
        struct cb_pcidas_private *devpriv = dev->private;

        i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
                                       &(devpriv->divisor2), ns,
                                       rounding_flags & TRIG_ROUND_MASK);

        /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
        i8254_load(devpriv->pacer_counter_dio + ADC8254, 0, 1,
                   devpriv->divisor1, 2);
        i8254_load(devpriv->pacer_counter_dio + ADC8254, 0, 2,
                   devpriv->divisor2, 2);
}

static int cb_pcidas_ai_cmd(struct comedi_device *dev,
                            struct comedi_subdevice *s)
{
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;
        struct comedi_async *async = s->async;
        struct comedi_cmd *cmd = &async->cmd;
        unsigned int bits;
        unsigned long flags;

        /*  make sure CAL_EN_BIT is disabled */
        outw(0, devpriv->control_status + CALIBRATION_REG);
        /*  initialize before settings pacer source and count values */
        outw(0, devpriv->control_status + TRIG_CONTSTAT);

        /*  clear fifo */
        outw(0, devpriv->adc_fifo + ADCFIFOCLR);

        /*  set mux limits, gain and pacer source */
        bits = BEGIN_SCAN(CR_CHAN(cmd->chanlist[0])) |
            END_SCAN(CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1])) |
            GAIN_BITS(CR_RANGE(cmd->chanlist[0]));
        /*  set unipolar/bipolar */
        if (CR_RANGE(cmd->chanlist[0]) & IS_UNIPOLAR)
                bits |= UNIP;
        /*  set singleended/differential */
        if (CR_AREF(cmd->chanlist[0]) != AREF_DIFF)
                bits |= SE;
        /*  set pacer source */
        if (cmd->convert_src == TRIG_EXT || cmd->scan_begin_src == TRIG_EXT)
                bits |= PACER_EXT_RISE;
        else
                bits |= PACER_INT;
        outw(bits, devpriv->control_status + ADCMUX_CONT);

        /*  load counters */
        if (cmd->convert_src == TRIG_TIMER)
                cb_pcidas_load_counters(dev, &cmd->convert_arg,
                                        cmd->flags & TRIG_ROUND_MASK);
        else if (cmd->scan_begin_src == TRIG_TIMER)
                cb_pcidas_load_counters(dev, &cmd->scan_begin_arg,
                                        cmd->flags & TRIG_ROUND_MASK);

        /*  set number of conversions */
        if (cmd->stop_src == TRIG_COUNT)
                devpriv->count = cmd->chanlist_len * cmd->stop_arg;
        /*  enable interrupts */
        spin_lock_irqsave(&dev->spinlock, flags);
        devpriv->adc_fifo_bits |= INTE;
        devpriv->adc_fifo_bits &= ~INT_MASK;
        if (cmd->flags & TRIG_WAKE_EOS) {
                if (cmd->convert_src == TRIG_NOW && cmd->chanlist_len > 1) {
                        /* interrupt end of burst */
                        devpriv->adc_fifo_bits |= INT_EOS;
                } else {
                        /* interrupt fifo not empty */
                        devpriv->adc_fifo_bits |= INT_FNE;
                }
        } else {
                /* interrupt fifo half full */
                devpriv->adc_fifo_bits |= INT_FHF;
        }

        /*  enable (and clear) interrupts */
        outw(devpriv->adc_fifo_bits | EOAI | INT | LADFUL,
             devpriv->control_status + INT_ADCFIFO);
        spin_unlock_irqrestore(&dev->spinlock, flags);

        /*  set start trigger and burst mode */
        bits = 0;
        if (cmd->start_src == TRIG_NOW)
                bits |= SW_TRIGGER;
        else if (cmd->start_src == TRIG_EXT) {
                bits |= EXT_TRIGGER | TGEN | XTRCL;
                if (thisboard->is_1602) {
                        if (cmd->start_arg & CR_INVERT)
                                bits |= TGPOL;
                        if (cmd->start_arg & CR_EDGE)
                                bits |= TGSEL;
                }
        } else {
                comedi_error(dev, "bug!");
                return -1;
        }
        if (cmd->convert_src == TRIG_NOW && cmd->chanlist_len > 1)
                bits |= BURSTE;
        outw(bits, devpriv->control_status + TRIG_CONTSTAT);

        return 0;
}

static int cb_pcidas_ao_cmdtest(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_cmd *cmd)
{
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;
        int err = 0;
        int tmp;

        /* step 1: trigger sources are trivially valid */

        tmp = cmd->start_src;
        cmd->start_src &= TRIG_INT;
        if (!cmd->start_src || tmp != cmd->start_src)
                err++;

        tmp = cmd->scan_begin_src;
        cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
        if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
                err++;

        tmp = cmd->convert_src;
        cmd->convert_src &= TRIG_NOW;
        if (!cmd->convert_src || tmp != cmd->convert_src)
                err++;

        tmp = cmd->scan_end_src;
        cmd->scan_end_src &= TRIG_COUNT;
        if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
                err++;

        tmp = cmd->stop_src;
        cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
        if (!cmd->stop_src || tmp != cmd->stop_src)
                err++;

        if (err)
                return 1;

        /* step 2: trigger sources are unique and mutually compatible */

        if (cmd->scan_begin_src != TRIG_TIMER &&
            cmd->scan_begin_src != TRIG_EXT)
                err++;
        if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
                err++;

        if (err)
                return 2;

        /* step 3: arguments are trivially compatible */

        if (cmd->start_arg != 0) {
                cmd->start_arg = 0;
                err++;
        }

        if (cmd->scan_begin_src == TRIG_TIMER) {
                if (cmd->scan_begin_arg < thisboard->ao_scan_speed) {
                        cmd->scan_begin_arg = thisboard->ao_scan_speed;
                        err++;
                }
        }

        if (cmd->scan_end_arg != cmd->chanlist_len) {
                cmd->scan_end_arg = cmd->chanlist_len;
                err++;
        }
        if (cmd->stop_src == TRIG_NONE) {
                /* TRIG_NONE */
                if (cmd->stop_arg != 0) {
                        cmd->stop_arg = 0;
                        err++;
                }
        }

        if (err)
                return 3;

        /* step 4: fix up any arguments */

        if (cmd->scan_begin_src == TRIG_TIMER) {
                tmp = cmd->scan_begin_arg;
                i8253_cascade_ns_to_timer_2div(TIMER_BASE,
                                               &(devpriv->ao_divisor1),
                                               &(devpriv->ao_divisor2),
                                               &(cmd->scan_begin_arg),
                                               cmd->flags & TRIG_ROUND_MASK);
                if (tmp != cmd->scan_begin_arg)
                        err++;
        }

        if (err)
                return 4;

        /*  check channel/gain list against card's limitations */
        if (cmd->chanlist && cmd->chanlist_len > 1) {
                if (CR_CHAN(cmd->chanlist[0]) != 0 ||
                    CR_CHAN(cmd->chanlist[1]) != 1) {
                        comedi_error(dev,
                                     "channels must be ordered channel 0, channel 1 in chanlist\n");
                        err++;
                }
        }

        if (err)
                return 5;

        return 0;
}

/* cancel analog input command */
static int cb_pcidas_cancel(struct comedi_device *dev,
                            struct comedi_subdevice *s)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned long flags;

        spin_lock_irqsave(&dev->spinlock, flags);
        /*  disable interrupts */
        devpriv->adc_fifo_bits &= ~INTE & ~EOAIE;
        outw(devpriv->adc_fifo_bits, devpriv->control_status + INT_ADCFIFO);
        spin_unlock_irqrestore(&dev->spinlock, flags);

        /*  disable start trigger source and burst mode */
        outw(0, devpriv->control_status + TRIG_CONTSTAT);
        /*  software pacer source */
        outw(0, devpriv->control_status + ADCMUX_CONT);

        return 0;
}

static int cb_pcidas_ao_inttrig(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                unsigned int trig_num)
{
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned int num_bytes, num_points = thisboard->fifo_size;
        struct comedi_async *async = s->async;
        struct comedi_cmd *cmd = &s->async->cmd;
        unsigned long flags;

        if (trig_num != 0)
                return -EINVAL;

        /*  load up fifo */
        if (cmd->stop_src == TRIG_COUNT && devpriv->ao_count < num_points)
                num_points = devpriv->ao_count;

        num_bytes = cfc_read_array_from_buffer(s, devpriv->ao_buffer,
                                               num_points * sizeof(short));
        num_points = num_bytes / sizeof(short);

        if (cmd->stop_src == TRIG_COUNT)
                devpriv->ao_count -= num_points;
        /*  write data to board's fifo */
        outsw(devpriv->ao_registers + DACDATA, devpriv->ao_buffer, num_bytes);

        /*  enable dac half-full and empty interrupts */
        spin_lock_irqsave(&dev->spinlock, flags);
        devpriv->adc_fifo_bits |= DAEMIE | DAHFIE;

        /*  enable and clear interrupts */
        outw(devpriv->adc_fifo_bits | DAEMI | DAHFI,
             devpriv->control_status + INT_ADCFIFO);

        /*  start dac */
        devpriv->ao_control_bits |= DAC_START | DACEN | DAC_EMPTY;
        outw(devpriv->ao_control_bits, devpriv->control_status + DAC_CSR);

        spin_unlock_irqrestore(&dev->spinlock, flags);

        async->inttrig = NULL;

        return 0;
}

static int cb_pcidas_ao_cmd(struct comedi_device *dev,
                            struct comedi_subdevice *s)
{
        struct cb_pcidas_private *devpriv = dev->private;
        struct comedi_async *async = s->async;
        struct comedi_cmd *cmd = &async->cmd;
        unsigned int i;
        unsigned long flags;

        /*  set channel limits, gain */
        spin_lock_irqsave(&dev->spinlock, flags);
        for (i = 0; i < cmd->chanlist_len; i++) {
                /*  enable channel */
                devpriv->ao_control_bits |=
                    DAC_CHAN_EN(CR_CHAN(cmd->chanlist[i]));
                /*  set range */
                devpriv->ao_control_bits |= DAC_RANGE(CR_CHAN(cmd->chanlist[i]),
                                                      CR_RANGE(cmd->
                                                               chanlist[i]));
        }

        /*  disable analog out before settings pacer source and count values */
        outw(devpriv->ao_control_bits, devpriv->control_status + DAC_CSR);
        spin_unlock_irqrestore(&dev->spinlock, flags);

        /*  clear fifo */
        outw(0, devpriv->ao_registers + DACFIFOCLR);

        /*  load counters */
        if (cmd->scan_begin_src == TRIG_TIMER) {
                i8253_cascade_ns_to_timer_2div(TIMER_BASE,
                                               &(devpriv->ao_divisor1),
                                               &(devpriv->ao_divisor2),
                                               &(cmd->scan_begin_arg),
                                               cmd->flags);

                /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
                i8254_load(devpriv->pacer_counter_dio + DAC8254, 0, 1,
                           devpriv->ao_divisor1, 2);
                i8254_load(devpriv->pacer_counter_dio + DAC8254, 0, 2,
                           devpriv->ao_divisor2, 2);
        }
        /*  set number of conversions */
        if (cmd->stop_src == TRIG_COUNT)
                devpriv->ao_count = cmd->chanlist_len * cmd->stop_arg;
        /*  set pacer source */
        spin_lock_irqsave(&dev->spinlock, flags);
        switch (cmd->scan_begin_src) {
        case TRIG_TIMER:
                devpriv->ao_control_bits |= DAC_PACER_INT;
                break;
        case TRIG_EXT:
                devpriv->ao_control_bits |= DAC_PACER_EXT_RISE;
                break;
        default:
                spin_unlock_irqrestore(&dev->spinlock, flags);
                comedi_error(dev, "error setting dac pacer source");
                return -1;
                break;
        }
        spin_unlock_irqrestore(&dev->spinlock, flags);

        async->inttrig = cb_pcidas_ao_inttrig;

        return 0;
}

/* cancel analog output command */
static int cb_pcidas_ao_cancel(struct comedi_device *dev,
                               struct comedi_subdevice *s)
{
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned long flags;

        spin_lock_irqsave(&dev->spinlock, flags);
        /*  disable interrupts */
        devpriv->adc_fifo_bits &= ~DAHFIE & ~DAEMIE;
        outw(devpriv->adc_fifo_bits, devpriv->control_status + INT_ADCFIFO);

        /*  disable output */
        devpriv->ao_control_bits &= ~DACEN & ~DAC_PACER_MASK;
        outw(devpriv->ao_control_bits, devpriv->control_status + DAC_CSR);
        spin_unlock_irqrestore(&dev->spinlock, flags);

        return 0;
}

static void handle_ao_interrupt(struct comedi_device *dev, unsigned int status)
{
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;
        struct comedi_subdevice *s = dev->write_subdev;
        struct comedi_async *async = s->async;
        struct comedi_cmd *cmd = &async->cmd;
        unsigned int half_fifo = thisboard->fifo_size / 2;
        unsigned int num_points;
        unsigned long flags;

        async->events = 0;

        if (status & DAEMI) {
                /*  clear dac empty interrupt latch */
                spin_lock_irqsave(&dev->spinlock, flags);
                outw(devpriv->adc_fifo_bits | DAEMI,
                     devpriv->control_status + INT_ADCFIFO);
                spin_unlock_irqrestore(&dev->spinlock, flags);
                if (inw(devpriv->ao_registers + DAC_CSR) & DAC_EMPTY) {
                        if (cmd->stop_src == TRIG_NONE ||
                            (cmd->stop_src == TRIG_COUNT
                             && devpriv->ao_count)) {
                                comedi_error(dev, "dac fifo underflow");
                                cb_pcidas_ao_cancel(dev, s);
                                async->events |= COMEDI_CB_ERROR;
                        }
                        async->events |= COMEDI_CB_EOA;
                }
        } else if (status & DAHFI) {
                unsigned int num_bytes;

                /*  figure out how many points we are writing to fifo */
                num_points = half_fifo;
                if (cmd->stop_src == TRIG_COUNT &&
                    devpriv->ao_count < num_points)
                        num_points = devpriv->ao_count;
                num_bytes =
                    cfc_read_array_from_buffer(s, devpriv->ao_buffer,
                                               num_points * sizeof(short));
                num_points = num_bytes / sizeof(short);

                if (async->cmd.stop_src == TRIG_COUNT)
                        devpriv->ao_count -= num_points;
                /*  write data to board's fifo */
                outsw(devpriv->ao_registers + DACDATA, devpriv->ao_buffer,
                      num_points);
                /*  clear half-full interrupt latch */
                spin_lock_irqsave(&dev->spinlock, flags);
                outw(devpriv->adc_fifo_bits | DAHFI,
                     devpriv->control_status + INT_ADCFIFO);
                spin_unlock_irqrestore(&dev->spinlock, flags);
        }

        comedi_event(dev, s);
}

static irqreturn_t cb_pcidas_interrupt(int irq, void *d)
{
        struct comedi_device *dev = (struct comedi_device *)d;
        const struct cb_pcidas_board *thisboard = comedi_board(dev);
        struct cb_pcidas_private *devpriv = dev->private;
        struct comedi_subdevice *s = dev->read_subdev;
        struct comedi_async *async;
        int status, s5933_status;
        int half_fifo = thisboard->fifo_size / 2;
        unsigned int num_samples, i;
        static const int timeout = 10000;
        unsigned long flags;

        if (dev->attached == 0)
                return IRQ_NONE;

        async = s->async;
        async->events = 0;

        s5933_status = inl(devpriv->s5933_config + AMCC_OP_REG_INTCSR);

        if ((INTCSR_INTR_ASSERTED & s5933_status) == 0)
                return IRQ_NONE;

        /*  make sure mailbox 4 is empty */
        inl_p(devpriv->s5933_config + AMCC_OP_REG_IMB4);
        /*  clear interrupt on amcc s5933 */
        outl(devpriv->s5933_intcsr_bits | INTCSR_INBOX_INTR_STATUS,
             devpriv->s5933_config + AMCC_OP_REG_INTCSR);

        status = inw(devpriv->control_status + INT_ADCFIFO);

        /*  check for analog output interrupt */
        if (status & (DAHFI | DAEMI))
                handle_ao_interrupt(dev, status);
        /*  check for analog input interrupts */
        /*  if fifo half-full */
        if (status & ADHFI) {
                /*  read data */
                num_samples = half_fifo;
                if (async->cmd.stop_src == TRIG_COUNT &&
                    num_samples > devpriv->count) {
                        num_samples = devpriv->count;
                }
                insw(devpriv->adc_fifo + ADCDATA, devpriv->ai_buffer,
                     num_samples);
                cfc_write_array_to_buffer(s, devpriv->ai_buffer,
                                          num_samples * sizeof(short));
                devpriv->count -= num_samples;
                if (async->cmd.stop_src == TRIG_COUNT && devpriv->count == 0) {
                        async->events |= COMEDI_CB_EOA;
                        cb_pcidas_cancel(dev, s);
                }
                /*  clear half-full interrupt latch */
                spin_lock_irqsave(&dev->spinlock, flags);
                outw(devpriv->adc_fifo_bits | INT,
                     devpriv->control_status + INT_ADCFIFO);
                spin_unlock_irqrestore(&dev->spinlock, flags);
                /*  else if fifo not empty */
        } else if (status & (ADNEI | EOBI)) {
                for (i = 0; i < timeout; i++) {
                        /*  break if fifo is empty */
                        if ((ADNE & inw(devpriv->control_status +
                                        INT_ADCFIFO)) == 0)
                                break;
                        cfc_write_to_buffer(s, inw(devpriv->adc_fifo));
                        if (async->cmd.stop_src == TRIG_COUNT &&
                            --devpriv->count == 0) {
                                /* end of acquisition */
                                cb_pcidas_cancel(dev, s);
                                async->events |= COMEDI_CB_EOA;
                                break;
                        }
                }
                /*  clear not-empty interrupt latch */
                spin_lock_irqsave(&dev->spinlock, flags);
                outw(devpriv->adc_fifo_bits | INT,
                     devpriv->control_status + INT_ADCFIFO);
                spin_unlock_irqrestore(&dev->spinlock, flags);
        } else if (status & EOAI) {
                comedi_error(dev,
                             "bug! encountered end of acquisition interrupt?");
                /*  clear EOA interrupt latch */
                spin_lock_irqsave(&dev->spinlock, flags);
                outw(devpriv->adc_fifo_bits | EOAI,
                     devpriv->control_status + INT_ADCFIFO);
                spin_unlock_irqrestore(&dev->spinlock, flags);
        }
        /* check for fifo overflow */
        if (status & LADFUL) {
                comedi_error(dev, "fifo overflow");
                /*  clear overflow interrupt latch */
                spin_lock_irqsave(&dev->spinlock, flags);
                outw(devpriv->adc_fifo_bits | LADFUL,
                     devpriv->control_status + INT_ADCFIFO);
                spin_unlock_irqrestore(&dev->spinlock, flags);
                cb_pcidas_cancel(dev, s);
                async->events |= COMEDI_CB_EOA | COMEDI_CB_ERROR;
        }

        comedi_event(dev, s);

        return IRQ_HANDLED;
}

static struct pci_dev *cb_pcidas_find_pci_device(struct comedi_device *dev,
                                                 struct comedi_devconfig *it)
{
        const struct cb_pcidas_board *thisboard;
        struct pci_dev *pcidev = NULL;
        int bus = it->options[0];
        int slot = it->options[1];
        int i;

        for_each_pci_dev(pcidev) {
                /*  is it not a computer boards card? */
                if (pcidev->vendor != PCI_VENDOR_ID_CB)
                        continue;
                /*  loop through cards supported by this driver */
                for (i = 0; i < ARRAY_SIZE(cb_pcidas_boards); i++) {
                        thisboard = &cb_pcidas_boards[i];
                        if (thisboard->device_id != pcidev->device)
                                continue;
                        /*  was a particular bus/slot requested? */
                        if (bus || slot) {
                                /*  are we on the wrong bus/slot? */
                                if (pcidev->bus->number != bus ||
                                    PCI_SLOT(pcidev->devfn) != slot) {
                                        continue;
                                }
                        }
                        dev_dbg(dev->class_dev,
                                "Found %s on bus %i, slot %i\n",
                                thisboard->name,
                                pcidev->bus->number, PCI_SLOT(pcidev->devfn));
                        dev->board_ptr = thisboard;
                        return pcidev;
                }
        }
        dev_err(dev->class_dev, "No supported card found\n");
        return NULL;
}

static int cb_pcidas_attach(struct comedi_device *dev,
                            struct comedi_devconfig *it)
{
        const struct cb_pcidas_board *thisboard;
        struct cb_pcidas_private *devpriv;
        struct pci_dev *pcidev;
        struct comedi_subdevice *s;
        int i;
        int ret;

        if (alloc_private(dev, sizeof(struct cb_pcidas_private)) < 0)
                return -ENOMEM;
        devpriv = dev->private;

        pcidev = cb_pcidas_find_pci_device(dev, it);
        if (!pcidev)
                return -EIO;
        comedi_set_hw_dev(dev, &pcidev->dev);
        thisboard = comedi_board(dev);

        if (comedi_pci_enable(pcidev, dev->driver->driver_name)) {
                dev_err(dev->class_dev,
                        "Failed to enable PCI device and request regions\n");
                return -EIO;
        }

        devpriv->s5933_config = pci_resource_start(pcidev, 0);
        devpriv->control_status = pci_resource_start(pcidev, 1);
        devpriv->adc_fifo = pci_resource_start(pcidev, 2);
        devpriv->pacer_counter_dio = pci_resource_start(pcidev, 3);
        if (thisboard->ao_nchan)
                devpriv->ao_registers = pci_resource_start(pcidev, 4);

        /*  disable and clear interrupts on amcc s5933 */
        outl(INTCSR_INBOX_INTR_STATUS,
             devpriv->s5933_config + AMCC_OP_REG_INTCSR);

        if (request_irq(pcidev->irq, cb_pcidas_interrupt,
                        IRQF_SHARED, dev->driver->driver_name, dev)) {
                dev_dbg(dev->class_dev, "unable to allocate irq %d\n",
                        pcidev->irq);
                return -EINVAL;
        }
        dev->irq = pcidev->irq;

        dev->board_name = thisboard->name;

        ret = comedi_alloc_subdevices(dev, 7);
        if (ret)
                return ret;

        s = dev->subdevices + 0;
        /* analog input subdevice */
        dev->read_subdev = s;
        s->type = COMEDI_SUBD_AI;
        s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF | SDF_CMD_READ;
        /* WARNING: Number of inputs in differential mode is ignored */
        s->n_chan = thisboard->ai_nchan;
        s->len_chanlist = thisboard->ai_nchan;
        s->maxdata = (1 << thisboard->ai_bits) - 1;
        s->range_table = thisboard->ranges;
        s->insn_read = cb_pcidas_ai_rinsn;
        s->insn_config = ai_config_insn;
        s->do_cmd = cb_pcidas_ai_cmd;
        s->do_cmdtest = cb_pcidas_ai_cmdtest;
        s->cancel = cb_pcidas_cancel;

        /* analog output subdevice */
        s = dev->subdevices + 1;
        if (thisboard->ao_nchan) {
                s->type = COMEDI_SUBD_AO;
                s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_GROUND;
                s->n_chan = thisboard->ao_nchan;
                /*
                 * analog out resolution is the same as
                 * analog input resolution, so use ai_bits
                 */
                s->maxdata = (1 << thisboard->ai_bits) - 1;
                s->range_table = &cb_pcidas_ao_ranges;
                s->insn_read = cb_pcidas_ao_readback_insn;
                if (thisboard->has_ao_fifo) {
                        dev->write_subdev = s;
                        s->subdev_flags |= SDF_CMD_WRITE;
                        s->insn_write = cb_pcidas_ao_fifo_winsn;
                        s->do_cmdtest = cb_pcidas_ao_cmdtest;
                        s->do_cmd = cb_pcidas_ao_cmd;
                        s->cancel = cb_pcidas_ao_cancel;
                } else {
                        s->insn_write = cb_pcidas_ao_nofifo_winsn;
                }
        } else {
                s->type = COMEDI_SUBD_UNUSED;
        }

        /* 8255 */
        s = dev->subdevices + 2;
        ret = subdev_8255_init(dev, s, NULL,
                               devpriv->pacer_counter_dio + DIO_8255);
        if (ret)
                return ret;

        /*  serial EEPROM, */
        s = dev->subdevices + 3;
        s->type = COMEDI_SUBD_MEMORY;
        s->subdev_flags = SDF_READABLE | SDF_INTERNAL;
        s->n_chan = 256;
        s->maxdata = 0xff;
        s->insn_read = eeprom_read_insn;

        /*  8800 caldac */
        s = dev->subdevices + 4;
        s->type = COMEDI_SUBD_CALIB;
        s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
        s->n_chan = NUM_CHANNELS_8800;
        s->maxdata = 0xff;
        s->insn_read = caldac_read_insn;
        s->insn_write = caldac_write_insn;
        for (i = 0; i < s->n_chan; i++)
                caldac_8800_write(dev, i, s->maxdata / 2);

        /*  trim potentiometer */
        s = dev->subdevices + 5;
        s->type = COMEDI_SUBD_CALIB;
        s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
        if (thisboard->trimpot == AD7376) {
                s->n_chan = NUM_CHANNELS_7376;
                s->maxdata = 0x7f;
        } else {
                s->n_chan = NUM_CHANNELS_8402;
                s->maxdata = 0xff;
        }
        s->insn_read = trimpot_read_insn;
        s->insn_write = trimpot_write_insn;
        for (i = 0; i < s->n_chan; i++)
                cb_pcidas_trimpot_write(dev, i, s->maxdata / 2);

        /*  dac08 caldac */
        s = dev->subdevices + 6;
        if (thisboard->has_dac08) {
                s->type = COMEDI_SUBD_CALIB;
                s->subdev_flags = SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
                s->n_chan = NUM_CHANNELS_DAC08;
                s->insn_read = dac08_read_insn;
                s->insn_write = dac08_write_insn;
                s->maxdata = 0xff;
                dac08_write(dev, s->maxdata / 2);
        } else
                s->type = COMEDI_SUBD_UNUSED;

        /*  make sure mailbox 4 is empty */
        inl(devpriv->s5933_config + AMCC_OP_REG_IMB4);
        /* Set bits to enable incoming mailbox interrupts on amcc s5933. */
        devpriv->s5933_intcsr_bits =
            INTCSR_INBOX_BYTE(3) | INTCSR_INBOX_SELECT(3) |
            INTCSR_INBOX_FULL_INT;
        /*  clear and enable interrupt on amcc s5933 */
        outl(devpriv->s5933_intcsr_bits | INTCSR_INBOX_INTR_STATUS,
             devpriv->s5933_config + AMCC_OP_REG_INTCSR);

        return 1;
}

static void cb_pcidas_detach(struct comedi_device *dev)
{
        struct cb_pcidas_private *devpriv = dev->private;
        struct pci_dev *pcidev = comedi_to_pci_dev(dev);

        if (devpriv) {
                if (devpriv->s5933_config) {
                        outl(INTCSR_INBOX_INTR_STATUS,
                             devpriv->s5933_config + AMCC_OP_REG_INTCSR);
                }
        }
        if (dev->irq)
                free_irq(dev->irq, dev);
        if (dev->subdevices)
                subdev_8255_cleanup(dev, dev->subdevices + 2);
        if (pcidev) {
                if (devpriv->s5933_config)
                        comedi_pci_disable(pcidev);
                pci_dev_put(pcidev);
        }
}

static struct comedi_driver cb_pcidas_driver = {
        .driver_name    = "cb_pcidas",
        .module         = THIS_MODULE,
        .attach         = cb_pcidas_attach,
        .detach         = cb_pcidas_detach,
};

static int __devinit cb_pcidas_pci_probe(struct pci_dev *dev,
                                         const struct pci_device_id *ent)
{
        return comedi_pci_auto_config(dev, &cb_pcidas_driver);
}

static void __devexit cb_pcidas_pci_remove(struct pci_dev *dev)
{
        comedi_pci_auto_unconfig(dev);
}

static DEFINE_PCI_DEVICE_TABLE(cb_pcidas_pci_table) = {
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0001) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x000f) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0010) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0019) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x001c) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x004c) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x001a) },
        { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x001b) },
        { 0 }
};
MODULE_DEVICE_TABLE(pci, cb_pcidas_pci_table);

static struct pci_driver cb_pcidas_pci_driver = {
        .name           = "cb_pcidas",
        .id_table       = cb_pcidas_pci_table,
        .probe          = cb_pcidas_pci_probe,
        .remove         = __devexit_p(cb_pcidas_pci_remove)
};
module_comedi_pci_driver(cb_pcidas_driver, cb_pcidas_pci_driver);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");