/*
 *  comedi/drivers/adl_pci9118.c
 *
 *  hardware driver for ADLink cards:
 *   card:   PCI-9118DG, PCI-9118HG, PCI-9118HR
 *   driver: pci9118dg,  pci9118hg,  pci9118hr
 *
 * Author: Michal Dobes <dobes@tesnet.cz>
 *
*/
/*
Driver: adl_pci9118
Description: Adlink PCI-9118DG, PCI-9118HG, PCI-9118HR
Author: Michal Dobes <dobes@tesnet.cz>
Devices: [ADLink] PCI-9118DG (pci9118dg), PCI-9118HG (pci9118hg),
  PCI-9118HR (pci9118hr)
Status: works

This driver supports AI, AO, DI and DO subdevices.
AI subdevice supports cmd and insn interface,
other subdevices support only insn interface.
For AI:
- If cmd->scan_begin_src=TRIG_EXT then trigger input is TGIN (pin 46).
- If cmd->convert_src=TRIG_EXT then trigger input is EXTTRG (pin 44).
- If cmd->start_src/stop_src=TRIG_EXT then trigger input is TGIN (pin 46).
- It is not necessary to have cmd.scan_end_arg=cmd.chanlist_len but
  cmd.scan_end_arg modulo cmd.chanlist_len must by 0.
- If return value of cmdtest is 5 then you've bad channel list
  (it isn't possible mixture S.E. and DIFF inputs or bipolar and unipolar
  ranges).

There are some hardware limitations:
a) You cann't use mixture of unipolar/bipoar ranges or differencial/single
   ended inputs.
b) DMA transfers must have the length aligned to two samples (32 bit),
   so there is some problems if cmd->chanlist_len is odd. This driver tries
   bypass this with adding one sample to the end of the every scan and discard
   it on output but this cann't be used if cmd->scan_begin_src=TRIG_FOLLOW
   and is used flag TRIG_WAKE_EOS, then driver switch to interrupt driven mode
   with interrupt after every sample.
c) If isn't used DMA then you can use only mode where
   cmd->scan_begin_src=TRIG_FOLLOW.

Configuration options:
  [0] - PCI bus of device (optional)
  [1] - PCI slot of device (optional)
        If bus/slot is not specified, then first available PCI
        card will be used.
  [2] - 0= standard 8 DIFF/16 SE channels configuration
        n = external multiplexer connected, 1 <= n <= 256
  [3] - 0=autoselect DMA or EOC interrupts operation
        1 = disable DMA mode
        3 = disable DMA and INT, only insn interface will work
  [4] - sample&hold signal - card can generate signal for external S&H board
        0 = use SSHO(pin 45) signal is generated in onboard hardware S&H logic
        0 != use ADCHN7(pin 23) signal is generated from driver, number say how
                long delay is requested in ns and sign polarity of the hold
                (in this case external multiplexor can serve only 128 channels)
  [5] - 0=stop measure on all hardware errors
        2 | = ignore ADOR - A/D Overrun status
        8|=ignore Bover - A/D Burst Mode Overrun status
        256|=ignore nFull - A/D FIFO Full status

*/

/*
 * FIXME
 *
 * All the supported boards have the same PCI vendor and device IDs, so
 * auto-attachment of PCI devices will always find the first board type.
 *
 * Perhaps the boards have different subdevice IDs that we could use to
 * distinguish them?
 *
 * Need some device attributes so the board type can be corrected after
 * attachment if necessary, and possibly to set other options supported by
 * manual attachment.
 */

#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/interrupt.h>
#include <linux/io.h>

#include "../comedidev.h"

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

/* paranoid checks are broken */
#undef PCI9118_PARANOIDCHECK    /*
                                 * if defined, then is used code which control
                                 * correct channel number on every 12 bit sample
                                 */

#define IORANGE_9118    64      /* I hope */
#define PCI9118_CHANLEN 255     /*
                                 * len of chanlist, some source say 256,
                                 * but reality looks like 255 :-(
                                 */

#define PCI9118_CNT0    0x00    /* R/W: 8254 counter 0 */
#define PCI9118_CNT1    0x04    /* R/W: 8254 counter 0 */
#define PCI9118_CNT2    0x08    /* R/W: 8254 counter 0 */
#define PCI9118_CNTCTRL 0x0c    /* W:   8254 counter control */
#define PCI9118_AD_DATA 0x10    /* R:   A/D data */
#define PCI9118_DA1     0x10    /* W:   D/A registers */
#define PCI9118_DA2     0x14
#define PCI9118_ADSTAT  0x18    /* R:   A/D status register */
#define PCI9118_ADCNTRL 0x18    /* W:   A/D control register */
#define PCI9118_DI      0x1c    /* R:   digi input register */
#define PCI9118_DO      0x1c    /* W:   digi output register */
#define PCI9118_SOFTTRG 0x20    /* W:   soft trigger for A/D */
#define PCI9118_GAIN    0x24    /* W:   A/D gain/channel register */
#define PCI9118_BURST   0x28    /* W:   A/D burst number register */
#define PCI9118_SCANMOD 0x2c    /* W:   A/D auto scan mode */
#define PCI9118_ADFUNC  0x30    /* W:   A/D function register */
#define PCI9118_DELFIFO 0x34    /* W:   A/D data FIFO reset */
#define PCI9118_INTSRC  0x38    /* R:   interrupt reason register */
#define PCI9118_INTCTRL 0x38    /* W:   interrupt control register */

/* bits from A/D control register (PCI9118_ADCNTRL) */
#define AdControl_UniP  0x80    /* 1=bipolar, 0=unipolar */
#define AdControl_Diff  0x40    /* 1=differential, 0= single end inputs */
#define AdControl_SoftG 0x20    /* 1=8254 counter works, 0=counter stops */
#define AdControl_ExtG  0x10    /*
                                 * 1=8254 countrol controlled by TGIN(pin 46),
                                 * 0=controlled by SoftG
                                 */
#define AdControl_ExtM  0x08    /*
                                 * 1=external hardware trigger (pin 44),
                                 * 0=internal trigger
                                 */
#define AdControl_TmrTr 0x04    /*
                                 * 1=8254 is iternal trigger source,
                                 * 0=software trigger is source
                                 * (register PCI9118_SOFTTRG)
                                 */
#define AdControl_Int   0x02    /* 1=enable INT, 0=disable */
#define AdControl_Dma   0x01    /* 1=enable DMA, 0=disable */

/* bits from A/D function register (PCI9118_ADFUNC) */
#define AdFunction_PDTrg        0x80    /*
                                         * 1=positive,
                                         * 0=negative digital trigger
                                         * (only positive is correct)
                                         */
#define AdFunction_PETrg        0x40    /*
                                         * 1=positive,
                                         * 0=negative external trigger
                                         * (only positive is correct)
                                         */
#define AdFunction_BSSH         0x20    /* 1=with sample&hold, 0=without */
#define AdFunction_BM           0x10    /* 1=burst mode, 0=normal mode */
#define AdFunction_BS           0x08    /*
                                         * 1=burst mode start,
                                         * 0=burst mode stop
                                         */
#define AdFunction_PM           0x04    /*
                                         * 1=post trigger mode,
                                         * 0=not post trigger
                                         */
#define AdFunction_AM           0x02    /*
                                         * 1=about trigger mode,
                                         * 0=not about trigger
                                         */
#define AdFunction_Start        0x01    /* 1=trigger start, 0=trigger stop */

/* bits from A/D status register (PCI9118_ADSTAT) */
#define AdStatus_nFull  0x100   /* 0=FIFO full (fatal), 1=not full */
#define AdStatus_nHfull 0x080   /* 0=FIFO half full, 1=FIFO not half full */
#define AdStatus_nEpty  0x040   /* 0=FIFO empty, 1=FIFO not empty */
#define AdStatus_Acmp   0x020   /*  */
#define AdStatus_DTH    0x010   /* 1=external digital trigger */
#define AdStatus_Bover  0x008   /* 1=burst mode overrun (fatal) */
#define AdStatus_ADOS   0x004   /* 1=A/D over speed (warning) */
#define AdStatus_ADOR   0x002   /* 1=A/D overrun (fatal) */
#define AdStatus_ADrdy  0x001   /* 1=A/D already ready, 0=not ready */

/* bits for interrupt reason and control (PCI9118_INTSRC, PCI9118_INTCTRL) */
/* 1=interrupt occur, enable source,  0=interrupt not occur, disable source */
#define Int_Timer       0x08    /* timer interrupt */
#define Int_About       0x04    /* about trigger complete */
#define Int_Hfull       0x02    /* A/D FIFO hlaf full */
#define Int_DTrg        0x01    /* external digital trigger */

#define START_AI_EXT    0x01    /* start measure on external trigger */
#define STOP_AI_EXT     0x02    /* stop measure on external trigger */
#define START_AI_INT    0x04    /* start measure on internal trigger */
#define STOP_AI_INT     0x08    /* stop measure on internal trigger */

#define EXTTRG_AI       0       /* ext trg is used by AI */

static const struct comedi_lrange range_pci9118dg_hr = { 8, {
                                                             BIP_RANGE(5),
                                                             BIP_RANGE(2.5),
                                                             BIP_RANGE(1.25),
                                                             BIP_RANGE(0.625),
                                                             UNI_RANGE(10),
                                                             UNI_RANGE(5),
                                                             UNI_RANGE(2.5),
                                                             UNI_RANGE(1.25)
                                                             }
};

static const struct comedi_lrange range_pci9118hg = { 8, {
                                                          BIP_RANGE(5),
                                                          BIP_RANGE(0.5),
                                                          BIP_RANGE(0.05),
                                                          BIP_RANGE(0.005),
                                                          UNI_RANGE(10),
                                                          UNI_RANGE(1),
                                                          UNI_RANGE(0.1),
                                                          UNI_RANGE(0.01)
                                                          }
};

#define PCI9118_BIPOLAR_RANGES  4       /*
                                         * used for test on mixture
                                         * of BIP/UNI ranges
                                         */

struct boardtype {
        const char *name;               /* board name */
        int device_id;                  /* PCI device ID of card */
        int iorange_amcc;               /* iorange for own S5933 region */
        int iorange_9118;               /* pass thru card region size */
        int n_aichan;                   /* num of A/D chans */
        int n_aichand;                  /* num of A/D chans in diff mode */
        int mux_aichan;                 /*
                                         * num of A/D chans with
                                         * external multiplexor
                                         */
        int n_aichanlist;               /* len of chanlist */
        int n_aochan;                   /* num of D/A chans */
        int ai_maxdata;                 /* resolution of A/D */
        int ao_maxdata;                 /* resolution of D/A */
        const struct comedi_lrange *rangelist_ai;       /* rangelist for A/D */
        const struct comedi_lrange *rangelist_ao;       /* rangelist for D/A */
        unsigned int ai_ns_min;         /* max sample speed of card v ns */
        unsigned int ai_pacer_min;      /*
                                         * minimal pacer value
                                         * (c1*c2 or c1 in burst)
                                         */
        int half_fifo_size;             /* size of FIFO/2 */

};

static const struct boardtype boardtypes[] = {
        {
                .name           = "pci9118dg",
                .device_id      = 0x80d9,
                .iorange_amcc   = AMCC_OP_REG_SIZE,
                .iorange_9118   = IORANGE_9118,
                .n_aichan       = 16,
                .n_aichand      = 8,
                .mux_aichan     = 256,
                .n_aichanlist   = PCI9118_CHANLEN,
                .n_aochan       = 2,
                .ai_maxdata     = 0x0fff,
                .ao_maxdata     = 0x0fff,
                .rangelist_ai   = &range_pci9118dg_hr,
                .rangelist_ao   = &range_bipolar10,
                .ai_ns_min      = 3000,
                .ai_pacer_min   = 12,
                .half_fifo_size = 512,
        }, {
                .name           = "pci9118hg",
                .device_id      = 0x80d9,
                .iorange_amcc   = AMCC_OP_REG_SIZE,
                .iorange_9118   = IORANGE_9118,
                .n_aichan       = 16,
                .n_aichand      = 8,
                .mux_aichan     = 256,
                .n_aichanlist   = PCI9118_CHANLEN,
                .n_aochan       = 2,
                .ai_maxdata     = 0x0fff,
                .ao_maxdata     = 0x0fff,
                .rangelist_ai   = &range_pci9118hg,
                .rangelist_ao   = &range_bipolar10,
                .ai_ns_min      = 3000,
                .ai_pacer_min   = 12,
                .half_fifo_size = 512,
        }, {
                .name           = "pci9118hr",
                .device_id      = 0x80d9,
                .iorange_amcc   = AMCC_OP_REG_SIZE,
                .iorange_9118   = IORANGE_9118,
                .n_aichan       = 16,
                .n_aichand      = 8,
                .mux_aichan     = 256,
                .n_aichanlist   = PCI9118_CHANLEN,
                .n_aochan       = 2,
                .ai_maxdata     = 0xffff,
                .ao_maxdata     = 0x0fff,
                .rangelist_ai   = &range_pci9118dg_hr,
                .rangelist_ao   = &range_bipolar10,
                .ai_ns_min      = 10000,
                .ai_pacer_min   = 40,
                .half_fifo_size = 512,
        },
};

struct pci9118_private {
        unsigned long iobase_a; /* base+size for AMCC chip */
        unsigned int master;    /* master capable */
        unsigned int usemux;    /* we want to use external multiplexor! */
#ifdef PCI9118_PARANOIDCHECK
        unsigned short chanlist[PCI9118_CHANLEN + 1];   /*
                                                         * list of
                                                         * scanned channel
                                                         */
        unsigned char chanlistlen;      /* number of scanlist */
#endif
        unsigned char AdControlReg;     /* A/D control register */
        unsigned char IntControlReg;    /* Interrupt control register */
        unsigned char AdFunctionReg;    /* A/D function register */
        char valid;                     /* driver is ok */
        char ai_neverending;            /* we do unlimited AI */
        unsigned int i8254_osc_base;    /* frequence of onboard oscilator */
        unsigned int ai_do;             /* what do AI? 0=nothing, 1 to 4 mode */
        unsigned int ai_act_scan;       /* how many scans we finished */
        unsigned int ai_buf_ptr;        /* data buffer ptr in samples */
        unsigned int ai_n_chan;         /* how many channels is measured */
        unsigned int ai_n_scanlen;      /* len of actual scanlist */
        unsigned int ai_n_realscanlen;  /*
                                         * what we must transfer for one
                                         * outgoing scan include front/back adds
                                         */
        unsigned int ai_act_dmapos;     /* position in actual real stream */
        unsigned int ai_add_front;      /*
                                         * how many channels we must add
                                         * before scan to satisfy S&H?
                                         */
        unsigned int ai_add_back;       /*
                                         * how many channels we must add
                                         * before scan to satisfy DMA?
                                         */
        unsigned int *ai_chanlist;      /* actual chanlist */
        unsigned int ai_timer1;
        unsigned int ai_timer2;
        unsigned int ai_flags;
        char ai12_startstop;            /*
                                         * measure can start/stop
                                         * on external trigger
                                         */
        unsigned int ai_divisor1, ai_divisor2;  /*
                                                 * divisors for start of measure
                                                 * on external start
                                                 */
        unsigned int ai_data_len;
        short *ai_data;
        short ao_data[2];                       /* data output buffer */
        unsigned int ai_scans;                  /* number of scans to do */
        char dma_doublebuf;                     /* we can use double buffering */
        unsigned int dma_actbuf;                /* which buffer is used now */
        short *dmabuf_virt[2];                  /*
                                                 * pointers to begin of
                                                 * DMA buffer
                                                 */
        unsigned long dmabuf_hw[2];             /* hw address of DMA buff */
        unsigned int dmabuf_size[2];            /*
                                                 * size of dma buffer in bytes
                                                 */
        unsigned int dmabuf_use_size[2];        /*
                                                 * which size we may now use
                                                 * for transfer
                                                 */
        unsigned int dmabuf_used_size[2];       /* which size was truly used */
        unsigned int dmabuf_panic_size[2];
        unsigned int dmabuf_samples[2];         /* size in samples */
        int dmabuf_pages[2];                    /* number of pages in buffer */
        unsigned char cnt0_users;               /*
                                                 * bit field of 8254 CNT0 users
                                                 * (0-unused, 1-AO, 2-DI, 3-DO)
                                                 */
        unsigned char exttrg_users;             /*
                                                 * bit field of external trigger
                                                 * users(0-AI, 1-AO, 2-DI, 3-DO)
                                                 */
        unsigned int cnt0_divisor;              /* actual CNT0 divisor */
        void (*int_ai_func) (struct comedi_device *, struct comedi_subdevice *,
                unsigned short,
                unsigned int,
                unsigned short);        /*
                                         * ptr to actual interrupt
                                         * AI function
                                         */
        unsigned char ai16bits;         /* =1 16 bit card */
        unsigned char usedma;           /* =1 use DMA transfer and not INT */
        unsigned char useeoshandle;     /*
                                         * =1 change WAKE_EOS DMA transfer
                                         * to fit on every second
                                         */
        unsigned char usessh;           /* =1 turn on S&H support */
        int softsshdelay;               /*
                                         * >0 use software S&H,
                                         * numer is requested delay in ns
                                         */
        unsigned char softsshsample;    /*
                                         * polarity of S&H signal
                                         * in sample state
                                         */
        unsigned char softsshhold;      /*
                                         * polarity of S&H signal
                                         * in hold state
                                         */
        unsigned int ai_maskerr;        /* which warning was printed */
        unsigned int ai_maskharderr;    /* on which error bits stops */
        unsigned int ai_inttrig_start;  /* TRIG_INT for start */
};

static int check_channel_list(struct comedi_device *dev,
                              struct comedi_subdevice *s, int n_chan,
                              unsigned int *chanlist, int frontadd, int backadd)
{
        const struct boardtype *this_board = comedi_board(dev);
        struct pci9118_private *devpriv = dev->private;
        unsigned int i, differencial = 0, bipolar = 0;

        /* correct channel and range number check itself comedi/range.c */
        if (n_chan < 1) {
                comedi_error(dev, "range/channel list is empty!");
                return 0;
        }
        if ((frontadd + n_chan + backadd) > s->len_chanlist) {
                comedi_error(dev,
                            "range/channel list is too long for actual configuration!\n");
                return 0;
        }

        if (CR_AREF(chanlist[0]) == AREF_DIFF)
                differencial = 1;       /* all input must be diff */
        if (CR_RANGE(chanlist[0]) < PCI9118_BIPOLAR_RANGES)
                bipolar = 1;    /* all input must be bipolar */
        if (n_chan > 1)
                for (i = 1; i < n_chan; i++) {  /* check S.E/diff */
                        if ((CR_AREF(chanlist[i]) == AREF_DIFF) !=
                            (differencial)) {
                                comedi_error(dev,
                                             "Differencial and single ended "
                                                "inputs can't be mixtured!");
                                return 0;
                        }
                        if ((CR_RANGE(chanlist[i]) < PCI9118_BIPOLAR_RANGES) !=
                            (bipolar)) {
                                comedi_error(dev,
                                             "Bipolar and unipolar ranges "
                                                        "can't be mixtured!");
                                return 0;
                        }
                        if (!devpriv->usemux && differencial &&
                            (CR_CHAN(chanlist[i]) >= this_board->n_aichand)) {
                                comedi_error(dev,
                                             "If AREF_DIFF is used then is "
                                        "available only first 8 channels!");
                                return 0;
                        }
                }

        return 1;
}

static int setup_channel_list(struct comedi_device *dev,
                              struct comedi_subdevice *s, int n_chan,
                              unsigned int *chanlist, int rot, int frontadd,
                              int backadd, int usedma, char useeos)
{
        struct pci9118_private *devpriv = dev->private;
        unsigned int i, differencial = 0, bipolar = 0;
        unsigned int scanquad, gain, ssh = 0x00;

        if (usedma == 1) {
                rot = 8;
                usedma = 0;
        }

        if (CR_AREF(chanlist[0]) == AREF_DIFF)
                differencial = 1;       /* all input must be diff */
        if (CR_RANGE(chanlist[0]) < PCI9118_BIPOLAR_RANGES)
                bipolar = 1;    /* all input must be bipolar */

        /* All is ok, so we can setup channel/range list */

        if (!bipolar) {
                devpriv->AdControlReg |= AdControl_UniP;
                                                        /* set unibipolar */
        } else {
                devpriv->AdControlReg &= ((~AdControl_UniP) & 0xff);
                                                        /* enable bipolar */
        }

        if (differencial) {
                devpriv->AdControlReg |= AdControl_Diff;
                                                        /* enable diff inputs */
        } else {
                devpriv->AdControlReg &= ((~AdControl_Diff) & 0xff);
                                                /* set single ended inputs */
        }

        outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);
                                                                /* setup mode */

        outl(2, dev->iobase + PCI9118_SCANMOD);
                                        /* gods know why this sequence! */
        outl(0, dev->iobase + PCI9118_SCANMOD);
        outl(1, dev->iobase + PCI9118_SCANMOD);

#ifdef PCI9118_PARANOIDCHECK
        devpriv->chanlistlen = n_chan;
        for (i = 0; i < (PCI9118_CHANLEN + 1); i++)
                devpriv->chanlist[i] = 0x55aa;
#endif

        if (frontadd) {         /* insert channels for S&H */
                ssh = devpriv->softsshsample;
                for (i = 0; i < frontadd; i++) {
                                                /* store range list to card */
                        scanquad = CR_CHAN(chanlist[0]);
                                                /* get channel number; */
                        gain = CR_RANGE(chanlist[0]);
                                                /* get gain number */
                        scanquad |= ((gain & 0x03) << 8);
                        outl(scanquad | ssh, dev->iobase + PCI9118_GAIN);
                        ssh = devpriv->softsshhold;
                }
        }

        for (i = 0; i < n_chan; i++) {  /* store range list to card */
                scanquad = CR_CHAN(chanlist[i]);        /* get channel number */
#ifdef PCI9118_PARANOIDCHECK
                devpriv->chanlist[i ^ usedma] = (scanquad & 0xf) << rot;
#endif
                gain = CR_RANGE(chanlist[i]);           /* get gain number */
                scanquad |= ((gain & 0x03) << 8);
                outl(scanquad | ssh, dev->iobase + PCI9118_GAIN);
        }

        if (backadd) {          /* insert channels for fit onto 32bit DMA */
                for (i = 0; i < backadd; i++) { /* store range list to card */
                        scanquad = CR_CHAN(chanlist[0]);
                                                        /* get channel number */
                        gain = CR_RANGE(chanlist[0]);   /* get gain number */
                        scanquad |= ((gain & 0x03) << 8);
                        outl(scanquad | ssh, dev->iobase + PCI9118_GAIN);
                }
        }
#ifdef PCI9118_PARANOIDCHECK
        devpriv->chanlist[n_chan ^ usedma] = devpriv->chanlist[0 ^ usedma];
                                                /* for 32bit operations */
        if (useeos) {
                for (i = 1; i < n_chan; i++) {  /* store range list to card */
                        devpriv->chanlist[(n_chan + i) ^ usedma] =
                            (CR_CHAN(chanlist[i]) & 0xf) << rot;
                }
                devpriv->chanlist[(2 * n_chan) ^ usedma] =
                                                devpriv->chanlist[0 ^ usedma];
                                                /* for 32bit operations */
                useeos = 2;
        } else {
                useeos = 1;
        }
#endif
        outl(0, dev->iobase + PCI9118_SCANMOD); /* close scan queue */
        /* udelay(100); important delay, or first sample will be crippled */

        return 1;               /* we can serve this with scan logic */
}

static int pci9118_insn_read_ai(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_insn *insn, unsigned int *data)
{
        struct pci9118_private *devpriv = dev->private;
        int n, timeout;

        devpriv->AdControlReg = AdControl_Int & 0xff;
        devpriv->AdFunctionReg = AdFunction_PDTrg | AdFunction_PETrg;
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
                                                /*
                                                 * positive triggers, no S&H,
                                                 * no burst, burst stop,
                                                 * no post trigger,
                                                 * no about trigger,
                                                 * trigger stop
                                                 */

        if (!setup_channel_list(dev, s, 1, &insn->chanspec, 0, 0, 0, 0, 0))
                return -EINVAL;

        outl(0, dev->iobase + PCI9118_DELFIFO); /* flush FIFO */

        for (n = 0; n < insn->n; n++) {
                outw(0, dev->iobase + PCI9118_SOFTTRG); /* start conversion */
                udelay(2);
                timeout = 100;
                while (timeout--) {
                        if (inl(dev->iobase + PCI9118_ADSTAT) & AdStatus_ADrdy)
                                goto conv_finish;
                        udelay(1);
                }

                comedi_error(dev, "A/D insn timeout");
                data[n] = 0;
                outl(0, dev->iobase + PCI9118_DELFIFO); /* flush FIFO */
                return -ETIME;

conv_finish:
                if (devpriv->ai16bits) {
                        data[n] =
                            (inl(dev->iobase +
                                 PCI9118_AD_DATA) & 0xffff) ^ 0x8000;
                } else {
                        data[n] =
                            (inw(dev->iobase + PCI9118_AD_DATA) >> 4) & 0xfff;
                }
        }

        outl(0, dev->iobase + PCI9118_DELFIFO); /* flush FIFO */
        return n;

}

static int pci9118_insn_write_ao(struct comedi_device *dev,
                                 struct comedi_subdevice *s,
                                 struct comedi_insn *insn, unsigned int *data)
{
        struct pci9118_private *devpriv = dev->private;
        int n, chanreg, ch;

        ch = CR_CHAN(insn->chanspec);
        if (ch)
                chanreg = PCI9118_DA2;
        else
                chanreg = PCI9118_DA1;


        for (n = 0; n < insn->n; n++) {
                outl(data[n], dev->iobase + chanreg);
                devpriv->ao_data[ch] = data[n];
        }

        return n;
}

static int pci9118_insn_read_ao(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_insn *insn, unsigned int *data)
{
        struct pci9118_private *devpriv = dev->private;
        int n, chan;

        chan = CR_CHAN(insn->chanspec);
        for (n = 0; n < insn->n; n++)
                data[n] = devpriv->ao_data[chan];

        return n;
}

static int pci9118_insn_bits_di(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_insn *insn, unsigned int *data)
{
        data[1] = inl(dev->iobase + PCI9118_DI) & 0xf;

        return insn->n;
}

static int pci9118_insn_bits_do(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_insn *insn, unsigned int *data)
{
        if (data[0]) {
                s->state &= ~data[0];
                s->state |= (data[0] & data[1]);
                outl(s->state & 0x0f, dev->iobase + PCI9118_DO);
        }
        data[1] = s->state;

        return insn->n;
}

static void interrupt_pci9118_ai_mode4_switch(struct comedi_device *dev)
{
        struct pci9118_private *devpriv = dev->private;

        devpriv->AdFunctionReg =
            AdFunction_PDTrg | AdFunction_PETrg | AdFunction_AM;
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
        outl(0x30, dev->iobase + PCI9118_CNTCTRL);
        outl((devpriv->dmabuf_hw[1 - devpriv->dma_actbuf] >> 1) & 0xff,
             dev->iobase + PCI9118_CNT0);
        outl((devpriv->dmabuf_hw[1 - devpriv->dma_actbuf] >> 9) & 0xff,
             dev->iobase + PCI9118_CNT0);
        devpriv->AdFunctionReg |= AdFunction_Start;
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
}

static unsigned int defragment_dma_buffer(struct comedi_device *dev,
                                          struct comedi_subdevice *s,
                                          short *dma_buffer,
                                          unsigned int num_samples)
{
        struct pci9118_private *devpriv = dev->private;
        unsigned int i = 0, j = 0;
        unsigned int start_pos = devpriv->ai_add_front,
            stop_pos = devpriv->ai_add_front + devpriv->ai_n_chan;
        unsigned int raw_scanlen = devpriv->ai_add_front + devpriv->ai_n_chan +
            devpriv->ai_add_back;

        for (i = 0; i < num_samples; i++) {
                if (devpriv->ai_act_dmapos >= start_pos &&
                    devpriv->ai_act_dmapos < stop_pos) {
                        dma_buffer[j++] = dma_buffer[i];
                }
                devpriv->ai_act_dmapos++;
                devpriv->ai_act_dmapos %= raw_scanlen;
        }

        return j;
}

static int move_block_from_dma(struct comedi_device *dev,
                                        struct comedi_subdevice *s,
                                        short *dma_buffer,
                                        unsigned int num_samples)
{
        struct pci9118_private *devpriv = dev->private;
        unsigned int num_bytes;

        num_samples = defragment_dma_buffer(dev, s, dma_buffer, num_samples);
        devpriv->ai_act_scan +=
            (s->async->cur_chan + num_samples) / devpriv->ai_n_scanlen;
        s->async->cur_chan += num_samples;
        s->async->cur_chan %= devpriv->ai_n_scanlen;
        num_bytes =
            cfc_write_array_to_buffer(s, dma_buffer,
                                      num_samples * sizeof(short));
        if (num_bytes < num_samples * sizeof(short))
                return -1;
        return 0;
}

static int pci9118_exttrg_add(struct comedi_device *dev, unsigned char source)
{
        struct pci9118_private *devpriv = dev->private;

        if (source > 3)
                return -1;                              /* incorrect source */
        devpriv->exttrg_users |= (1 << source);
        devpriv->IntControlReg |= Int_DTrg;
        outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
        outl(inl(devpriv->iobase_a + AMCC_OP_REG_INTCSR) | 0x1f00,
                                        devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                                        /* allow INT in AMCC */
        return 0;
}

static int pci9118_exttrg_del(struct comedi_device *dev, unsigned char source)
{
        struct pci9118_private *devpriv = dev->private;

        if (source > 3)
                return -1;                      /* incorrect source */
        devpriv->exttrg_users &= ~(1 << source);
        if (!devpriv->exttrg_users) {   /* shutdown ext trg intterrupts */
                devpriv->IntControlReg &= ~Int_DTrg;
                if (!devpriv->IntControlReg)    /* all IRQ disabled */
                        outl(inl(devpriv->iobase_a + AMCC_OP_REG_INTCSR) &
                                        (~0x00001f00),
                                        devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                                /* disable int in AMCC */
                outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
        }
        return 0;
}

static void pci9118_calc_divisors(char mode, struct comedi_device *dev,
                                  struct comedi_subdevice *s,
                                  unsigned int *tim1, unsigned int *tim2,
                                  unsigned int flags, int chans,
                                  unsigned int *div1, unsigned int *div2,
                                  char usessh, unsigned int chnsshfront)
{
        const struct boardtype *this_board = comedi_board(dev);
        struct pci9118_private *devpriv = dev->private;

        switch (mode) {
        case 1:
        case 4:
                if (*tim2 < this_board->ai_ns_min)
                        *tim2 = this_board->ai_ns_min;
                i8253_cascade_ns_to_timer(devpriv->i8254_osc_base, div1, div2,
                                          tim2, flags & TRIG_ROUND_NEAREST);
                break;
        case 2:
                if (*tim2 < this_board->ai_ns_min)
                        *tim2 = this_board->ai_ns_min;
                *div1 = *tim2 / devpriv->i8254_osc_base;
                                                /* convert timer (burst) */
                if (*div1 < this_board->ai_pacer_min)
                        *div1 = this_board->ai_pacer_min;
                *div2 = *tim1 / devpriv->i8254_osc_base;        /* scan timer */
                *div2 = *div2 / *div1;          /* major timer is c1*c2 */
                if (*div2 < chans)
                        *div2 = chans;

                *tim2 = *div1 * devpriv->i8254_osc_base;
                                                        /* real convert timer */

                if (usessh && (chnsshfront == 0))       /* use BSSH signal */
                        if (*div2 < (chans + 2))
                                *div2 = chans + 2;

                *tim1 = *div1 * *div2 * devpriv->i8254_osc_base;
                break;
        }
}

static void start_pacer(struct comedi_device *dev, int mode,
                        unsigned int divisor1, unsigned int divisor2)
{
        outl(0x74, dev->iobase + PCI9118_CNTCTRL);
        outl(0xb4, dev->iobase + PCI9118_CNTCTRL);
/* outl(0x30, dev->iobase + PCI9118_CNTCTRL); */
        udelay(1);

        if ((mode == 1) || (mode == 2) || (mode == 4)) {
                outl(divisor2 & 0xff, dev->iobase + PCI9118_CNT2);
                outl((divisor2 >> 8) & 0xff, dev->iobase + PCI9118_CNT2);
                outl(divisor1 & 0xff, dev->iobase + PCI9118_CNT1);
                outl((divisor1 >> 8) & 0xff, dev->iobase + PCI9118_CNT1);
        }
}

static int pci9118_ai_cancel(struct comedi_device *dev,
                             struct comedi_subdevice *s)
{
        struct pci9118_private *devpriv = dev->private;

        if (devpriv->usedma)
                outl(inl(devpriv->iobase_a + AMCC_OP_REG_MCSR) &
                        (~EN_A2P_TRANSFERS),
                        devpriv->iobase_a + AMCC_OP_REG_MCSR);  /* stop DMA */
        pci9118_exttrg_del(dev, EXTTRG_AI);
        start_pacer(dev, 0, 0, 0);      /* stop 8254 counters */
        devpriv->AdFunctionReg = AdFunction_PDTrg | AdFunction_PETrg;
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
                                        /*
                                         * positive triggers, no S&H, no burst,
                                         * burst stop, no post trigger,
                                         * no about trigger, trigger stop
                                         */
        devpriv->AdControlReg = 0x00;
        outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);
                                        /*
                                         * bipolar, S.E., use 8254, stop 8354,
                                         * internal trigger, soft trigger,
                                         * disable INT and DMA
                                         */
        outl(0, dev->iobase + PCI9118_BURST);
        outl(1, dev->iobase + PCI9118_SCANMOD);
        outl(2, dev->iobase + PCI9118_SCANMOD); /* reset scan queue */
        outl(0, dev->iobase + PCI9118_DELFIFO); /* flush FIFO */

        devpriv->ai_do = 0;
        devpriv->usedma = 0;

        devpriv->ai_act_scan = 0;
        devpriv->ai_act_dmapos = 0;
        s->async->cur_chan = 0;
        s->async->inttrig = NULL;
        devpriv->ai_buf_ptr = 0;
        devpriv->ai_neverending = 0;
        devpriv->dma_actbuf = 0;

        if (!devpriv->IntControlReg)
                outl(inl(devpriv->iobase_a + AMCC_OP_REG_INTCSR) | 0x1f00,
                                        devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                                        /* allow INT in AMCC */

        return 0;
}

static char pci9118_decode_error_status(struct comedi_device *dev,
                                        struct comedi_subdevice *s,
                                        unsigned char m)
{
        struct pci9118_private *devpriv = dev->private;

        if (m & 0x100) {
                comedi_error(dev, "A/D FIFO Full status (Fatal Error!)");
                devpriv->ai_maskerr &= ~0x100L;
        }
        if (m & 0x008) {
                comedi_error(dev,
                             "A/D Burst Mode Overrun Status (Fatal Error!)");
                devpriv->ai_maskerr &= ~0x008L;
        }
        if (m & 0x004) {
                comedi_error(dev, "A/D Over Speed Status (Warning!)");
                devpriv->ai_maskerr &= ~0x004L;
        }
        if (m & 0x002) {
                comedi_error(dev, "A/D Overrun Status (Fatal Error!)");
                devpriv->ai_maskerr &= ~0x002L;
        }
        if (m & devpriv->ai_maskharderr) {
                s->async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
                pci9118_ai_cancel(dev, s);
                comedi_event(dev, s);
                return 1;
        }

        return 0;
}

static void pci9118_ai_munge(struct comedi_device *dev,
                             struct comedi_subdevice *s, void *data,
                             unsigned int num_bytes,
                             unsigned int start_chan_index)
{
        struct pci9118_private *devpriv = dev->private;
        unsigned int i, num_samples = num_bytes / sizeof(short);
        short *array = data;

        for (i = 0; i < num_samples; i++) {
                if (devpriv->usedma)
                        array[i] = be16_to_cpu(array[i]);
                if (devpriv->ai16bits)
                        array[i] ^= 0x8000;
                else
                        array[i] = (array[i] >> 4) & 0x0fff;

        }
}

static void interrupt_pci9118_ai_onesample(struct comedi_device *dev,
                                           struct comedi_subdevice *s,
                                           unsigned short int_adstat,
                                           unsigned int int_amcc,
                                           unsigned short int_daq)
{
        struct pci9118_private *devpriv = dev->private;
        register short sampl;

        s->async->events = 0;

        if (int_adstat & devpriv->ai_maskerr)
                if (pci9118_decode_error_status(dev, s, int_adstat))
                        return;

        sampl = inw(dev->iobase + PCI9118_AD_DATA);

#ifdef PCI9118_PARANOIDCHECK
        if (devpriv->ai16bits == 0) {
                if ((sampl & 0x000f) != devpriv->chanlist[s->async->cur_chan]) {
                                                        /* data dropout! */
                        dev_info(dev->class_dev,
                                 "A/D  SAMPL - data dropout: received channel %d, expected %d!\n",
                                 sampl & 0x000f,
                                 devpriv->chanlist[s->async->cur_chan]);
                        s->async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
                        pci9118_ai_cancel(dev, s);
                        comedi_event(dev, s);
                        return;
                }
        }
#endif
        cfc_write_to_buffer(s, sampl);
        s->async->cur_chan++;
        if (s->async->cur_chan >= devpriv->ai_n_scanlen) {
                                                        /* one scan done */
                s->async->cur_chan %= devpriv->ai_n_scanlen;
                devpriv->ai_act_scan++;
                if (!(devpriv->ai_neverending))
                        if (devpriv->ai_act_scan >= devpriv->ai_scans) {
                                                        /* all data sampled */
                                pci9118_ai_cancel(dev, s);
                                s->async->events |= COMEDI_CB_EOA;
                        }
        }

        if (s->async->events)
                comedi_event(dev, s);
}

static void interrupt_pci9118_ai_dma(struct comedi_device *dev,
                                     struct comedi_subdevice *s,
                                     unsigned short int_adstat,
                                     unsigned int int_amcc,
                                     unsigned short int_daq)
{
        struct pci9118_private *devpriv = dev->private;
        unsigned int next_dma_buf, samplesinbuf, sampls, m;

        if (int_amcc & MASTER_ABORT_INT) {
                comedi_error(dev, "AMCC IRQ - MASTER DMA ABORT!");

                s->async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
                pci9118_ai_cancel(dev, s);
                comedi_event(dev, s);
                return;
        }

        if (int_amcc & TARGET_ABORT_INT) {
                comedi_error(dev, "AMCC IRQ - TARGET DMA ABORT!");
                s->async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
                pci9118_ai_cancel(dev, s);
                comedi_event(dev, s);
                return;
        }
        if (int_adstat & devpriv->ai_maskerr)
                                        /* if (int_adstat & 0x106) */
                if (pci9118_decode_error_status(dev, s, int_adstat))
                        return;

        samplesinbuf = devpriv->dmabuf_use_size[devpriv->dma_actbuf] >> 1;
                                        /* number of received real samples */

        if (devpriv->dma_doublebuf) {   /*
                                         * switch DMA buffers if is used
                                         * double buffering
                                         */
                next_dma_buf = 1 - devpriv->dma_actbuf;
                outl(devpriv->dmabuf_hw[next_dma_buf],
                     devpriv->iobase_a + AMCC_OP_REG_MWAR);
                outl(devpriv->dmabuf_use_size[next_dma_buf],
                     devpriv->iobase_a + AMCC_OP_REG_MWTC);
                devpriv->dmabuf_used_size[next_dma_buf] =
                    devpriv->dmabuf_use_size[next_dma_buf];
                if (devpriv->ai_do == 4)
                        interrupt_pci9118_ai_mode4_switch(dev);
        }

        if (samplesinbuf) {
                m = devpriv->ai_data_len >> 1;  /*
                                                 * how many samples is to
                                                 * end of buffer
                                                 */
                sampls = m;
                move_block_from_dma(dev, s,
                                    devpriv->dmabuf_virt[devpriv->dma_actbuf],
                                    samplesinbuf);
                m = m - sampls;         /* m= how many samples was transferred */
        }

        if (!devpriv->ai_neverending)
                if (devpriv->ai_act_scan >= devpriv->ai_scans) {
                                                        /* all data sampled */
                        pci9118_ai_cancel(dev, s);
                        s->async->events |= COMEDI_CB_EOA;
                }

        if (devpriv->dma_doublebuf) {   /* switch dma buffers */
                devpriv->dma_actbuf = 1 - devpriv->dma_actbuf;
        } else {        /* restart DMA if is not used double buffering */
                outl(devpriv->dmabuf_hw[0],
                     devpriv->iobase_a + AMCC_OP_REG_MWAR);
                outl(devpriv->dmabuf_use_size[0],
                     devpriv->iobase_a + AMCC_OP_REG_MWTC);
                if (devpriv->ai_do == 4)
                        interrupt_pci9118_ai_mode4_switch(dev);
        }

        comedi_event(dev, s);
}

static irqreturn_t interrupt_pci9118(int irq, void *d)
{
        struct comedi_device *dev = d;
        struct pci9118_private *devpriv = dev->private;
        unsigned int int_daq = 0, int_amcc, int_adstat;

        if (!dev->attached)
                return IRQ_NONE;        /* not fully initialized */

        int_daq = inl(dev->iobase + PCI9118_INTSRC) & 0xf;
                                        /* get IRQ reasons from card */
        int_amcc = inl(devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                        /* get INT register from AMCC chip */

        if ((!int_daq) && (!(int_amcc & ANY_S593X_INT)))
                return IRQ_NONE;        /* interrupt from other source */

        outl(int_amcc | 0x00ff0000, devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                        /* shutdown IRQ reasons in AMCC */

        int_adstat = inw(dev->iobase + PCI9118_ADSTAT) & 0x1ff;
                                        /* get STATUS register */

        if (devpriv->ai_do) {
                if (devpriv->ai12_startstop)
                        if ((int_adstat & AdStatus_DTH) &&
                                                        (int_daq & Int_DTrg)) {
                                                /* start stop of measure */
                                if (devpriv->ai12_startstop & START_AI_EXT) {
                                        devpriv->ai12_startstop &=
                                            ~START_AI_EXT;
                                        if (!(devpriv->ai12_startstop &
                                                        STOP_AI_EXT))
                                                        pci9118_exttrg_del
                                                        (dev, EXTTRG_AI);
                                                /* deactivate EXT trigger */
                                        start_pacer(dev, devpriv->ai_do,
                                                devpriv->ai_divisor1,
                                                devpriv->ai_divisor2);
                                                /* start pacer */
                                        outl(devpriv->AdControlReg,
                                                dev->iobase + PCI9118_ADCNTRL);
                                } else {
                                        if (devpriv->ai12_startstop &
                                                STOP_AI_EXT) {
                                                devpriv->ai12_startstop &=
                                                        ~STOP_AI_EXT;
                                                pci9118_exttrg_del
                                                        (dev, EXTTRG_AI);
                                                /* deactivate EXT trigger */
                                                devpriv->ai_neverending = 0;
                                                /*
                                                 * well, on next interrupt from
                                                 * DMA/EOC measure will stop
                                                 */
                                        }
                                }
                        }

                (devpriv->int_ai_func) (dev, &dev->subdevices[0], int_adstat,
                                        int_amcc, int_daq);

        }
        return IRQ_HANDLED;
}

static int pci9118_ai_inttrig(struct comedi_device *dev,
                              struct comedi_subdevice *s, unsigned int trignum)
{
        struct pci9118_private *devpriv = dev->private;

        if (trignum != devpriv->ai_inttrig_start)
                return -EINVAL;

        devpriv->ai12_startstop &= ~START_AI_INT;
        s->async->inttrig = NULL;

        outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
        if (devpriv->ai_do != 3) {
                start_pacer(dev, devpriv->ai_do, devpriv->ai_divisor1,
                            devpriv->ai_divisor2);
                devpriv->AdControlReg |= AdControl_SoftG;
        }
        outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);

        return 1;
}

static int pci9118_ai_cmdtest(struct comedi_device *dev,
                              struct comedi_subdevice *s,
                              struct comedi_cmd *cmd)
{
        const struct boardtype *this_board = comedi_board(dev);
        struct pci9118_private *devpriv = dev->private;
        int err = 0;
        unsigned int flags;
        int tmp;
        unsigned int divisor1 = 0, divisor2 = 0;

        /* Step 1 : check if triggers are trivially valid */

        err |= cfc_check_trigger_src(&cmd->start_src,
                                        TRIG_NOW | TRIG_EXT | TRIG_INT);

        flags = TRIG_FOLLOW;
        if (devpriv->master)
                flags |= TRIG_TIMER | TRIG_EXT;
        err |= cfc_check_trigger_src(&cmd->scan_begin_src, flags);

        flags = TRIG_TIMER | TRIG_EXT;
        if (devpriv->master)
                flags |= TRIG_NOW;
        err |= cfc_check_trigger_src(&cmd->convert_src, flags);

        err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
        err |= cfc_check_trigger_src(&cmd->stop_src,
                                        TRIG_COUNT | TRIG_NONE | TRIG_EXT);

        if (err)
                return 1;

        /* Step 2a : make sure trigger sources are unique */

        err |= cfc_check_trigger_is_unique(cmd->start_src);
        err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
        err |= cfc_check_trigger_is_unique(cmd->convert_src);
        err |= cfc_check_trigger_is_unique(cmd->stop_src);

        /* Step 2b : and mutually compatible */

        if (cmd->start_src == TRIG_EXT && cmd->scan_begin_src == TRIG_EXT)
                err |= -EINVAL;

        if (cmd->start_src == TRIG_INT && cmd->scan_begin_src == TRIG_INT)
                err |= -EINVAL;

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

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

        if (cmd->stop_src == TRIG_EXT && cmd->scan_begin_src == TRIG_EXT)
                err |= -EINVAL;

        if (err)
                return 2;

        /* Step 3: check if arguments are trivially valid */

        if (cmd->start_src & (TRIG_NOW | TRIG_EXT))
                err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);

        if (cmd->scan_begin_src & (TRIG_FOLLOW | TRIG_EXT))
                err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);

        if ((cmd->scan_begin_src == TRIG_TIMER) &&
            (cmd->convert_src == TRIG_TIMER) && (cmd->scan_end_arg == 1)) {
                cmd->scan_begin_src = TRIG_FOLLOW;
                cmd->convert_arg = cmd->scan_begin_arg;
                cmd->scan_begin_arg = 0;
        }

        if (cmd->scan_begin_src == TRIG_TIMER)
                err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
                                                 this_board->ai_ns_min);

        if (cmd->scan_begin_src == TRIG_EXT)
                if (cmd->scan_begin_arg) {
                        cmd->scan_begin_arg = 0;
                        err |= -EINVAL;
                        err |= cfc_check_trigger_arg_max(&cmd->scan_end_arg,
                                                         65535);
                }

        if (cmd->convert_src & (TRIG_TIMER | TRIG_NOW))
                err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
                                                 this_board->ai_ns_min);

        if (cmd->convert_src == TRIG_EXT)
                err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);

        if (cmd->stop_src == TRIG_COUNT)
                err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
        else    /* TRIG_NONE */
                err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);

        err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
        err |= cfc_check_trigger_arg_max(&cmd->chanlist_len,
                                         this_board->n_aichanlist);

        err |= cfc_check_trigger_arg_min(&cmd->scan_end_arg,
                                         cmd->chanlist_len);

        if ((cmd->scan_end_arg % cmd->chanlist_len)) {
                cmd->scan_end_arg =
                    cmd->chanlist_len * (cmd->scan_end_arg / cmd->chanlist_len);
                err |= -EINVAL;
        }

        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(devpriv->i8254_osc_base, &divisor1,
                                          &divisor2, &cmd->scan_begin_arg,
                                          cmd->flags & TRIG_ROUND_MASK);
                if (cmd->scan_begin_arg < this_board->ai_ns_min)
                        cmd->scan_begin_arg = this_board->ai_ns_min;
                if (tmp != cmd->scan_begin_arg)
                        err++;
        }

        if (cmd->convert_src & (TRIG_TIMER | TRIG_NOW)) {
                tmp = cmd->convert_arg;
                i8253_cascade_ns_to_timer(devpriv->i8254_osc_base, &divisor1,
                                          &divisor2, &cmd->convert_arg,
                                          cmd->flags & TRIG_ROUND_MASK);
                if (cmd->convert_arg < this_board->ai_ns_min)
                        cmd->convert_arg = this_board->ai_ns_min;
                if (tmp != cmd->convert_arg)
                        err++;
                if (cmd->scan_begin_src == TRIG_TIMER
                    && cmd->convert_src == TRIG_NOW) {
                        if (cmd->convert_arg == 0) {
                                if (cmd->scan_begin_arg <
                                    this_board->ai_ns_min *
                                    (cmd->scan_end_arg + 2)) {
                                        cmd->scan_begin_arg =
                                            this_board->ai_ns_min *
                                            (cmd->scan_end_arg + 2);
                                        err++;
                                }
                        } else {
                                if (cmd->scan_begin_arg <
                                    cmd->convert_arg * cmd->chanlist_len) {
                                        cmd->scan_begin_arg =
                                            cmd->convert_arg *
                                            cmd->chanlist_len;
                                        err++;
                                }
                        }
                }
        }

        if (err)
                return 4;

        if (cmd->chanlist)
                if (!check_channel_list(dev, s, cmd->chanlist_len,
                                        cmd->chanlist, 0, 0))
                        return 5;       /* incorrect channels list */

        return 0;
}

static int Compute_and_setup_dma(struct comedi_device *dev)
{
        struct pci9118_private *devpriv = dev->private;
        unsigned int dmalen0, dmalen1, i;

        dmalen0 = devpriv->dmabuf_size[0];
        dmalen1 = devpriv->dmabuf_size[1];
        /* isn't output buff smaller that our DMA buff? */
        if (dmalen0 > (devpriv->ai_data_len)) {
                dmalen0 = devpriv->ai_data_len & ~3L;   /*
                                                         * align to 32bit down
                                                         */
        }
        if (dmalen1 > (devpriv->ai_data_len)) {
                dmalen1 = devpriv->ai_data_len & ~3L;   /*
                                                         * align to 32bit down
                                                         */
        }

        /* we want wake up every scan? */
        if (devpriv->ai_flags & TRIG_WAKE_EOS) {
                if (dmalen0 < (devpriv->ai_n_realscanlen << 1)) {
                        /* uff, too short DMA buffer, disable EOS support! */
                        devpriv->ai_flags &= (~TRIG_WAKE_EOS);
                        dev_info(dev->class_dev,
                                 "WAR: DMA0 buf too short, can't support TRIG_WAKE_EOS (%d<%d)\n",
                                  dmalen0, devpriv->ai_n_realscanlen << 1);
                } else {
                        /* short first DMA buffer to one scan */
                        dmalen0 = devpriv->ai_n_realscanlen << 1;
                        if (devpriv->useeoshandle)
                                dmalen0 += 2;
                        if (dmalen0 < 4) {
                                dev_info(dev->class_dev,
                                         "ERR: DMA0 buf len bug? (%d<4)\n",
                                         dmalen0);
                                dmalen0 = 4;
                        }
                }
        }
        if (devpriv->ai_flags & TRIG_WAKE_EOS) {
                if (dmalen1 < (devpriv->ai_n_realscanlen << 1)) {
                        /* uff, too short DMA buffer, disable EOS support! */
                        devpriv->ai_flags &= (~TRIG_WAKE_EOS);
                        dev_info(dev->class_dev,
                                 "WAR: DMA1 buf too short, can't support TRIG_WAKE_EOS (%d<%d)\n",
                                 dmalen1, devpriv->ai_n_realscanlen << 1);
                } else {
                        /* short second DMA buffer to one scan */
                        dmalen1 = devpriv->ai_n_realscanlen << 1;
                        if (devpriv->useeoshandle)
                                dmalen1 -= 2;
                        if (dmalen1 < 4) {
                                dev_info(dev->class_dev,
                                         "ERR: DMA1 buf len bug? (%d<4)\n",
                                         dmalen1);
                                dmalen1 = 4;
                        }
                }
        }

        /* transfer without TRIG_WAKE_EOS */
        if (!(devpriv->ai_flags & TRIG_WAKE_EOS)) {
                /* if it's possible then align DMA buffers to length of scan */
                i = dmalen0;
                dmalen0 =
                    (dmalen0 / (devpriv->ai_n_realscanlen << 1)) *
                    (devpriv->ai_n_realscanlen << 1);
                dmalen0 &= ~3L;
                if (!dmalen0)
                        dmalen0 = i;    /* uff. very long scan? */
                i = dmalen1;
                dmalen1 =
                    (dmalen1 / (devpriv->ai_n_realscanlen << 1)) *
                    (devpriv->ai_n_realscanlen << 1);
                dmalen1 &= ~3L;
                if (!dmalen1)
                        dmalen1 = i;    /* uff. very long scan? */
                /*
                 * if measure isn't neverending then test, if it fits whole
                 * into one or two DMA buffers
                 */
                if (!devpriv->ai_neverending) {
                        /* fits whole measure into one DMA buffer? */
                        if (dmalen0 >
                            ((devpriv->ai_n_realscanlen << 1) *
                             devpriv->ai_scans)) {
                                dmalen0 =
                                    (devpriv->ai_n_realscanlen << 1) *
                                    devpriv->ai_scans;
                                dmalen0 &= ~3L;
                        } else {        /*
                                         * fits whole measure into
                                         * two DMA buffer?
                                         */
                                if (dmalen1 >
                                    ((devpriv->ai_n_realscanlen << 1) *
                                     devpriv->ai_scans - dmalen0))
                                        dmalen1 =
                                            (devpriv->ai_n_realscanlen << 1) *
                                            devpriv->ai_scans - dmalen0;
                                dmalen1 &= ~3L;
                        }
                }
        }

        /* these DMA buffer size will be used */
        devpriv->dma_actbuf = 0;
        devpriv->dmabuf_use_size[0] = dmalen0;
        devpriv->dmabuf_use_size[1] = dmalen1;

#if 0
        if (devpriv->ai_n_scanlen < this_board->half_fifo_size) {
                devpriv->dmabuf_panic_size[0] =
                    (this_board->half_fifo_size / devpriv->ai_n_scanlen +
                     1) * devpriv->ai_n_scanlen * sizeof(short);
                devpriv->dmabuf_panic_size[1] =
                    (this_board->half_fifo_size / devpriv->ai_n_scanlen +
                     1) * devpriv->ai_n_scanlen * sizeof(short);
        } else {
                devpriv->dmabuf_panic_size[0] =
                    (devpriv->ai_n_scanlen << 1) % devpriv->dmabuf_size[0];
                devpriv->dmabuf_panic_size[1] =
                    (devpriv->ai_n_scanlen << 1) % devpriv->dmabuf_size[1];
        }
#endif

        outl(inl(devpriv->iobase_a + AMCC_OP_REG_MCSR) & (~EN_A2P_TRANSFERS),
                        devpriv->iobase_a + AMCC_OP_REG_MCSR);  /* stop DMA */
        outl(devpriv->dmabuf_hw[0], devpriv->iobase_a + AMCC_OP_REG_MWAR);
        outl(devpriv->dmabuf_use_size[0], devpriv->iobase_a + AMCC_OP_REG_MWTC);
        /* init DMA transfer */
        outl(0x00000000 | AINT_WRITE_COMPL,
             devpriv->iobase_a + AMCC_OP_REG_INTCSR);
/* outl(0x02000000|AINT_WRITE_COMPL, devpriv->iobase_a+AMCC_OP_REG_INTCSR); */

        outl(inl(devpriv->iobase_a +
                 AMCC_OP_REG_MCSR) | RESET_A2P_FLAGS | A2P_HI_PRIORITY |
             EN_A2P_TRANSFERS, devpriv->iobase_a + AMCC_OP_REG_MCSR);
        outl(inl(devpriv->iobase_a + AMCC_OP_REG_INTCSR) | EN_A2P_TRANSFERS,
                        devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                                /* allow bus mastering */

        return 0;
}

static int pci9118_ai_docmd_sampl(struct comedi_device *dev,
                                  struct comedi_subdevice *s)
{
        struct pci9118_private *devpriv = dev->private;

        switch (devpriv->ai_do) {
        case 1:
                devpriv->AdControlReg |= AdControl_TmrTr;
                break;
        case 2:
                comedi_error(dev, "pci9118_ai_docmd_sampl() mode 2 bug!\n");
                return -EIO;
        case 3:
                devpriv->AdControlReg |= AdControl_ExtM;
                break;
        case 4:
                comedi_error(dev, "pci9118_ai_docmd_sampl() mode 4 bug!\n");
                return -EIO;
        default:
                comedi_error(dev,
                             "pci9118_ai_docmd_sampl() mode number bug!\n");
                return -EIO;
        }

        devpriv->int_ai_func = interrupt_pci9118_ai_onesample;
                                                /* transfer function */

        if (devpriv->ai12_startstop)
                pci9118_exttrg_add(dev, EXTTRG_AI);
                                                /* activate EXT trigger */

        if ((devpriv->ai_do == 1) || (devpriv->ai_do == 2))
                devpriv->IntControlReg |= Int_Timer;

        devpriv->AdControlReg |= AdControl_Int;

        outl(inl(devpriv->iobase_a + AMCC_OP_REG_INTCSR) | 0x1f00,
                        devpriv->iobase_a + AMCC_OP_REG_INTCSR);
                                                        /* allow INT in AMCC */

        if (!(devpriv->ai12_startstop & (START_AI_EXT | START_AI_INT))) {
                outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
                outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
                if (devpriv->ai_do != 3) {
                        start_pacer(dev, devpriv->ai_do, devpriv->ai_divisor1,
                                    devpriv->ai_divisor2);
                        devpriv->AdControlReg |= AdControl_SoftG;
                }
                outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
        }

        return 0;
}

static int pci9118_ai_docmd_dma(struct comedi_device *dev,
                                struct comedi_subdevice *s)
{
        struct pci9118_private *devpriv = dev->private;

        Compute_and_setup_dma(dev);

        switch (devpriv->ai_do) {
        case 1:
                devpriv->AdControlReg |=
                    ((AdControl_TmrTr | AdControl_Dma) & 0xff);
                break;
        case 2:
                devpriv->AdControlReg |=
                    ((AdControl_TmrTr | AdControl_Dma) & 0xff);
                devpriv->AdFunctionReg =
                    AdFunction_PDTrg | AdFunction_PETrg | AdFunction_BM |
                    AdFunction_BS;
                if (devpriv->usessh && (!devpriv->softsshdelay))
                        devpriv->AdFunctionReg |= AdFunction_BSSH;
                outl(devpriv->ai_n_realscanlen, dev->iobase + PCI9118_BURST);
                break;
        case 3:
                devpriv->AdControlReg |=
                    ((AdControl_ExtM | AdControl_Dma) & 0xff);
                devpriv->AdFunctionReg = AdFunction_PDTrg | AdFunction_PETrg;
                break;
        case 4:
                devpriv->AdControlReg |=
                    ((AdControl_TmrTr | AdControl_Dma) & 0xff);
                devpriv->AdFunctionReg =
                    AdFunction_PDTrg | AdFunction_PETrg | AdFunction_AM;
                outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
                outl(0x30, dev->iobase + PCI9118_CNTCTRL);
                outl((devpriv->dmabuf_hw[0] >> 1) & 0xff,
                     dev->iobase + PCI9118_CNT0);
                outl((devpriv->dmabuf_hw[0] >> 9) & 0xff,
                     dev->iobase + PCI9118_CNT0);
                devpriv->AdFunctionReg |= AdFunction_Start;
                break;
        default:
                comedi_error(dev, "pci9118_ai_docmd_dma() mode number bug!\n");
                return -EIO;
        }

        if (devpriv->ai12_startstop) {
                pci9118_exttrg_add(dev, EXTTRG_AI);
                                                /* activate EXT trigger */
        }

        devpriv->int_ai_func = interrupt_pci9118_ai_dma;
                                                /* transfer function */

        outl(0x02000000 | AINT_WRITE_COMPL,
             devpriv->iobase_a + AMCC_OP_REG_INTCSR);

        if (!(devpriv->ai12_startstop & (START_AI_EXT | START_AI_INT))) {
                outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
                outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
                if (devpriv->ai_do != 3) {
                        start_pacer(dev, devpriv->ai_do, devpriv->ai_divisor1,
                                    devpriv->ai_divisor2);
                        devpriv->AdControlReg |= AdControl_SoftG;
                }
                outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);
        }

        return 0;
}

static int pci9118_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
        const struct boardtype *this_board = comedi_board(dev);
        struct pci9118_private *devpriv = dev->private;
        struct comedi_cmd *cmd = &s->async->cmd;
        unsigned int addchans = 0;
        int ret = 0;

        devpriv->ai12_startstop = 0;
        devpriv->ai_flags = cmd->flags;
        devpriv->ai_n_chan = cmd->chanlist_len;
        devpriv->ai_n_scanlen = cmd->scan_end_arg;
        devpriv->ai_chanlist = cmd->chanlist;
        devpriv->ai_data = s->async->prealloc_buf;
        devpriv->ai_data_len = s->async->prealloc_bufsz;
        devpriv->ai_timer1 = 0;
        devpriv->ai_timer2 = 0;
        devpriv->ai_add_front = 0;
        devpriv->ai_add_back = 0;
        devpriv->ai_maskerr = 0x10e;

        /* prepare for start/stop conditions */
        if (cmd->start_src == TRIG_EXT)
                devpriv->ai12_startstop |= START_AI_EXT;
        if (cmd->stop_src == TRIG_EXT) {
                devpriv->ai_neverending = 1;
                devpriv->ai12_startstop |= STOP_AI_EXT;
        }
        if (cmd->start_src == TRIG_INT) {
                devpriv->ai12_startstop |= START_AI_INT;
                devpriv->ai_inttrig_start = cmd->start_arg;
                s->async->inttrig = pci9118_ai_inttrig;
        }
#if 0
        if (cmd->stop_src == TRIG_INT) {
                devpriv->ai_neverending = 1;
                devpriv->ai12_startstop |= STOP_AI_INT;
        }
#endif
        if (cmd->stop_src == TRIG_NONE)
                devpriv->ai_neverending = 1;
        if (cmd->stop_src == TRIG_COUNT) {
                devpriv->ai_scans = cmd->stop_arg;
                devpriv->ai_neverending = 0;
        } else {
                devpriv->ai_scans = 0;
        }

        /* use sample&hold signal? */
        if (cmd->convert_src == TRIG_NOW)
                devpriv->usessh = 1;
        /* yes */
        else
                devpriv->usessh = 0;
                                /*  no */

        /*
         * use additional sample at end of every scan
         * to satisty DMA 32 bit transfer?
         */
        devpriv->ai_add_front = 0;
        devpriv->ai_add_back = 0;
        devpriv->useeoshandle = 0;
        if (devpriv->master) {
                devpriv->usedma = 1;
                if ((cmd->flags & TRIG_WAKE_EOS) &&
                    (devpriv->ai_n_scanlen == 1)) {
                        if (cmd->convert_src == TRIG_NOW)
                                devpriv->ai_add_back = 1;
                        if (cmd->convert_src == TRIG_TIMER) {
                                devpriv->usedma = 0;
                                        /*
                                         * use INT transfer if scanlist
                                         * have only one channel
                                         */
                        }
                }
                if ((cmd->flags & TRIG_WAKE_EOS) &&
                    (devpriv->ai_n_scanlen & 1) &&
                    (devpriv->ai_n_scanlen > 1)) {
                        if (cmd->scan_begin_src == TRIG_FOLLOW) {
                                /*
                                 * vpriv->useeoshandle=1; // change DMA transfer
                                 * block to fit EOS on every second call
                                 */
                                devpriv->usedma = 0;
                                /*
                                 * XXX maybe can be corrected to use 16 bit DMA
                                 */
                        } else {        /*
                                         * well, we must insert one sample
                                         * to end of EOS to meet 32 bit transfer
                                         */
                                devpriv->ai_add_back = 1;
                        }
                }
        } else {        /* interrupt transfer don't need any correction */
                devpriv->usedma = 0;
        }

        /*
         * we need software S&H signal?
         * It adds two samples before every scan as minimum
         */
        if (devpriv->usessh && devpriv->softsshdelay) {
                devpriv->ai_add_front = 2;
                if ((devpriv->usedma == 1) && (devpriv->ai_add_back == 1)) {
                                                        /* move it to front */
                        devpriv->ai_add_front++;
                        devpriv->ai_add_back = 0;
                }
                if (cmd->convert_arg < this_board->ai_ns_min)
                        cmd->convert_arg = this_board->ai_ns_min;
                addchans = devpriv->softsshdelay / cmd->convert_arg;
                if (devpriv->softsshdelay % cmd->convert_arg)
                        addchans++;
                if (addchans > (devpriv->ai_add_front - 1)) {
                                                        /* uff, still short */
                        devpriv->ai_add_front = addchans + 1;
                        if (devpriv->usedma == 1)
                                if ((devpriv->ai_add_front +
                                     devpriv->ai_n_chan +
                                     devpriv->ai_add_back) & 1)
                                        devpriv->ai_add_front++;
                                                        /* round up to 32 bit */
                }
        }
        /* well, we now know what must be all added */
        devpriv->ai_n_realscanlen =     /*
                                         * what we must take from card in real
                                         * to have ai_n_scanlen on output?
                                         */
            (devpriv->ai_add_front + devpriv->ai_n_chan +
             devpriv->ai_add_back) * (devpriv->ai_n_scanlen /
                                      devpriv->ai_n_chan);

        /* check and setup channel list */
        if (!check_channel_list(dev, s, devpriv->ai_n_chan,
                                devpriv->ai_chanlist, devpriv->ai_add_front,
                                devpriv->ai_add_back))
                return -EINVAL;
        if (!setup_channel_list(dev, s, devpriv->ai_n_chan,
                                devpriv->ai_chanlist, 0, devpriv->ai_add_front,
                                devpriv->ai_add_back, devpriv->usedma,
                                devpriv->useeoshandle))
                return -EINVAL;

        /* compute timers settings */
        /*
         * simplest way, fr=4Mhz/(tim1*tim2),
         * channel manipulation without timers effect
         */
        if (((cmd->scan_begin_src == TRIG_FOLLOW) ||
                (cmd->scan_begin_src == TRIG_EXT) ||
                (cmd->scan_begin_src == TRIG_INT)) &&
                (cmd->convert_src == TRIG_TIMER)) {
                                        /* both timer is used for one time */
                if (cmd->scan_begin_src == TRIG_EXT)
                        devpriv->ai_do = 4;
                else
                        devpriv->ai_do = 1;
                pci9118_calc_divisors(devpriv->ai_do, dev, s,
                                      &cmd->scan_begin_arg, &cmd->convert_arg,
                                      devpriv->ai_flags,
                                      devpriv->ai_n_realscanlen,
                                      &devpriv->ai_divisor1,
                                      &devpriv->ai_divisor2, devpriv->usessh,
                                      devpriv->ai_add_front);
                devpriv->ai_timer2 = cmd->convert_arg;
        }

        if ((cmd->scan_begin_src == TRIG_TIMER) &&
                ((cmd->convert_src == TRIG_TIMER) ||
                (cmd->convert_src == TRIG_NOW))) {
                                                /* double timed action */
                if (!devpriv->usedma) {
                        comedi_error(dev,
                                     "cmd->scan_begin_src=TRIG_TIMER works "
                                                "only with bus mastering!");
                        return -EIO;
                }

                devpriv->ai_do = 2;
                pci9118_calc_divisors(devpriv->ai_do, dev, s,
                                      &cmd->scan_begin_arg, &cmd->convert_arg,
                                      devpriv->ai_flags,
                                      devpriv->ai_n_realscanlen,
                                      &devpriv->ai_divisor1,
                                      &devpriv->ai_divisor2, devpriv->usessh,
                                      devpriv->ai_add_front);
                devpriv->ai_timer1 = cmd->scan_begin_arg;
                devpriv->ai_timer2 = cmd->convert_arg;
        }

        if ((cmd->scan_begin_src == TRIG_FOLLOW)
            && (cmd->convert_src == TRIG_EXT)) {
                devpriv->ai_do = 3;
        }

        start_pacer(dev, -1, 0, 0);     /* stop pacer */

        devpriv->AdControlReg = 0;      /*
                                         * bipolar, S.E., use 8254, stop 8354,
                                         * internal trigger, soft trigger,
                                         * disable DMA
                                         */
        outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);
        devpriv->AdFunctionReg = AdFunction_PDTrg | AdFunction_PETrg;
                                        /*
                                         * positive triggers, no S&H, no burst,
                                         * burst stop, no post trigger,
                                         * no about trigger, trigger stop
                                         */
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
        udelay(1);
        outl(0, dev->iobase + PCI9118_DELFIFO); /* flush FIFO */
        inl(dev->iobase + PCI9118_ADSTAT);      /*
                                                 * flush A/D and INT
                                                 * status register
                                                 */
        inl(dev->iobase + PCI9118_INTSRC);

        devpriv->ai_act_scan = 0;
        devpriv->ai_act_dmapos = 0;
        s->async->cur_chan = 0;
        devpriv->ai_buf_ptr = 0;

        if (devpriv->usedma)
                ret = pci9118_ai_docmd_dma(dev, s);
        else
                ret = pci9118_ai_docmd_sampl(dev, s);

        return ret;
}

static int pci9118_reset(struct comedi_device *dev)
{
        struct pci9118_private *devpriv = dev->private;

        devpriv->IntControlReg = 0;
        devpriv->exttrg_users = 0;
        inl(dev->iobase + PCI9118_INTCTRL);
        outl(devpriv->IntControlReg, dev->iobase + PCI9118_INTCTRL);
                                                /* disable interrupts source */
        outl(0x30, dev->iobase + PCI9118_CNTCTRL);
/* outl(0xb4, dev->iobase + PCI9118_CNTCTRL); */
        start_pacer(dev, 0, 0, 0);              /* stop 8254 counters */
        devpriv->AdControlReg = 0;
        outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);
                                                /*
                                                 * bipolar, S.E., use 8254,
                                                 * stop 8354, internal trigger,
                                                 * soft trigger,
                                                 * disable INT and DMA
                                                 */
        outl(0, dev->iobase + PCI9118_BURST);
        outl(1, dev->iobase + PCI9118_SCANMOD);
        outl(2, dev->iobase + PCI9118_SCANMOD); /* reset scan queue */
        devpriv->AdFunctionReg = AdFunction_PDTrg | AdFunction_PETrg;
        outl(devpriv->AdFunctionReg, dev->iobase + PCI9118_ADFUNC);
                                                /*
                                                 * positive triggers, no S&H,
                                                 * no burst, burst stop,
                                                 * no post trigger,
                                                 * no about trigger,
                                                 * trigger stop
                                                 */

        devpriv->ao_data[0] = 2047;
        devpriv->ao_data[1] = 2047;
        outl(devpriv->ao_data[0], dev->iobase + PCI9118_DA1);
                                                /* reset A/D outs to 0V */
        outl(devpriv->ao_data[1], dev->iobase + PCI9118_DA2);
        outl(0, dev->iobase + PCI9118_DO);      /* reset digi outs to L */
        udelay(10);
        inl(dev->iobase + PCI9118_AD_DATA);
        outl(0, dev->iobase + PCI9118_DELFIFO); /* flush FIFO */
        outl(0, dev->iobase + PCI9118_INTSRC);  /* remove INT requests */
        inl(dev->iobase + PCI9118_ADSTAT);      /* flush A/D status register */
        inl(dev->iobase + PCI9118_INTSRC);      /* flush INT requests */
        devpriv->AdControlReg = 0;
        outl(devpriv->AdControlReg, dev->iobase + PCI9118_ADCNTRL);
                                                /*
                                                 * bipolar, S.E., use 8254,
                                                 * stop 8354, internal trigger,
                                                 * soft trigger,
                                                 * disable INT and DMA
                                                 */

        devpriv->cnt0_users = 0;
        devpriv->exttrg_users = 0;

        return 0;
}

/*
 * FIXME - this is pretty ineffective because all the supported board types
 * have the same device ID!
 */
static const struct boardtype *pci9118_find_boardinfo(struct pci_dev *pcidev)
{
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(boardtypes); i++)
                if (pcidev->device == boardtypes[i].device_id)
                        return &boardtypes[i];
        return NULL;
}

static struct pci_dev *pci9118_find_pci(struct comedi_device *dev,
                                        struct comedi_devconfig *it)
{
        const struct boardtype *this_board = comedi_board(dev);
        struct pci_dev *pcidev = NULL;
        int bus = it->options[0];
        int slot = it->options[1];

        for_each_pci_dev(pcidev) {
                if (pcidev->vendor != PCI_VENDOR_ID_AMCC)
                        continue;
                if (pcidev->device != this_board->device_id)
                        continue;
                if (bus || slot) {
                        /* requested particular bus/slot */
                        if (pcidev->bus->number != bus ||
                            PCI_SLOT(pcidev->devfn) != slot)
                                continue;
                }
                return pcidev;
        }
        dev_err(dev->class_dev,
                "no supported board found! (req. bus/slot : %d/%d)\n",
                bus, slot);
        return NULL;
}

static void pci9118_report_attach(struct comedi_device *dev, unsigned int irq)
{
        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
        struct pci9118_private *devpriv = dev->private;
        char irqbuf[30];
        char muxbuf[30];

        if (irq)
                snprintf(irqbuf, sizeof(irqbuf), "irq %u%s", irq,
                         (dev->irq ? "" : " UNAVAILABLE"));
        else
                snprintf(irqbuf, sizeof(irqbuf), "irq DISABLED");
        if (devpriv->usemux)
                snprintf(muxbuf, sizeof(muxbuf), "ext mux %u chans",
                         devpriv->usemux);
        else
                snprintf(muxbuf, sizeof(muxbuf), "no ext mux");
        dev_info(dev->class_dev, "%s (pci %s, %s, %sbus master, %s) attached\n",
                 dev->board_name, pci_name(pcidev), irqbuf,
                 (devpriv->master ? "" : "no "), muxbuf);
}

static int pci9118_common_attach(struct comedi_device *dev, int disable_irq,
                                 int master, int ext_mux, int softsshdelay,
                                 int hw_err_mask)
{
        const struct boardtype *this_board = comedi_board(dev);
        struct pci9118_private *devpriv = dev->private;
        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
        struct comedi_subdevice *s;
        int ret, pages, i;
        unsigned int irq;
        u16 u16w;

        dev->board_name = this_board->name;
        ret = comedi_pci_enable(pcidev, dev->board_name);
        if (ret) {
                dev_err(dev->class_dev,
                        "cannot enable PCI device %s\n", pci_name(pcidev));
                return ret;
        }
        if (master)
                pci_set_master(pcidev);

        devpriv->iobase_a = pci_resource_start(pcidev, 0);
        dev->iobase = pci_resource_start(pcidev, 2);

        pci9118_reset(dev);

        if (master) {           /* alloc DMA buffers */
                devpriv->dma_doublebuf = 0;
                for (i = 0; i < 2; i++) {
                        for (pages = 4; pages >= 0; pages--) {
                                devpriv->dmabuf_virt[i] =
                                    (short *)__get_free_pages(GFP_KERNEL,
                                                              pages);
                                if (devpriv->dmabuf_virt[i])
                                        break;
                        }
                        if (devpriv->dmabuf_virt[i]) {
                                devpriv->dmabuf_pages[i] = pages;
                                devpriv->dmabuf_size[i] = PAGE_SIZE * pages;
                                devpriv->dmabuf_samples[i] =

                                    devpriv->dmabuf_size[i] >> 1;
                                devpriv->dmabuf_hw[i] =
                                    virt_to_bus((void *)
                                                devpriv->dmabuf_virt[i]);
                        }
                }
                if (!devpriv->dmabuf_virt[0]) {
                        dev_warn(dev->class_dev,
                                 "Can't allocate DMA buffer, DMA disabled!\n");
                        master = 0;
                }
                if (devpriv->dmabuf_virt[1])
                        devpriv->dma_doublebuf = 1;
        }
        devpriv->master = master;

        if (ext_mux > 0) {
                if (ext_mux > 256)
                        ext_mux = 256;  /* max 256 channels! */
                if (softsshdelay > 0)
                        if (ext_mux > 128)
                                ext_mux = 128;
                devpriv->usemux = ext_mux;
        } else {
                devpriv->usemux = 0;
        }

        if (softsshdelay < 0) {
                /* select sample&hold signal polarity */
                devpriv->softsshdelay = -softsshdelay;
                devpriv->softsshsample = 0x80;
                devpriv->softsshhold = 0x00;
        } else {
                devpriv->softsshdelay = softsshdelay;
                devpriv->softsshsample = 0x00;
                devpriv->softsshhold = 0x80;
        }

        pci_read_config_word(pcidev, PCI_COMMAND, &u16w);
        pci_write_config_word(pcidev, PCI_COMMAND, u16w | 64);
                                /* Enable parity check for parity error */

        ret = comedi_alloc_subdevices(dev, 4);
        if (ret)
                return ret;

        s = &dev->subdevices[0];
        dev->read_subdev = s;
        s->type = COMEDI_SUBD_AI;
        s->subdev_flags = SDF_READABLE | SDF_COMMON | SDF_GROUND | SDF_DIFF;
        if (devpriv->usemux)
                s->n_chan = devpriv->usemux;
        else
                s->n_chan = this_board->n_aichan;

        s->maxdata = this_board->ai_maxdata;
        s->len_chanlist = this_board->n_aichanlist;
        s->range_table = this_board->rangelist_ai;
        s->cancel = pci9118_ai_cancel;
        s->insn_read = pci9118_insn_read_ai;
        s->munge = pci9118_ai_munge;

        s = &dev->subdevices[1];
        s->type = COMEDI_SUBD_AO;
        s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
        s->n_chan = this_board->n_aochan;
        s->maxdata = this_board->ao_maxdata;
        s->len_chanlist = this_board->n_aochan;
        s->range_table = this_board->rangelist_ao;
        s->insn_write = pci9118_insn_write_ao;
        s->insn_read = pci9118_insn_read_ao;

        s = &dev->subdevices[2];
        s->type = COMEDI_SUBD_DI;
        s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_COMMON;
        s->n_chan = 4;
        s->maxdata = 1;
        s->len_chanlist = 4;
        s->range_table = &range_digital;
        s->io_bits = 0;         /* all bits input */
        s->insn_bits = pci9118_insn_bits_di;

        s = &dev->subdevices[3];
        s->type = COMEDI_SUBD_DO;
        s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
        s->n_chan = 4;
        s->maxdata = 1;
        s->len_chanlist = 4;
        s->range_table = &range_digital;
        s->io_bits = 0xf;       /* all bits output */
        s->insn_bits = pci9118_insn_bits_do;

        devpriv->valid = 1;
        devpriv->i8254_osc_base = 250;  /* 250ns=4MHz */
        devpriv->ai_maskharderr = 0x10a;
                                        /* default measure crash condition */
        if (hw_err_mask)                /* disable some requested */
                devpriv->ai_maskharderr &= ~hw_err_mask;

        switch (this_board->ai_maxdata) {
        case 0xffff:
                devpriv->ai16bits = 1;
                break;
        default:
                devpriv->ai16bits = 0;
                break;
        }

        if (disable_irq)
                irq = 0;
        else
                irq = pcidev->irq;
        if (irq > 0) {
                if (request_irq(irq, interrupt_pci9118, IRQF_SHARED,
                                dev->board_name, dev)) {
                        dev_warn(dev->class_dev,
                                 "unable to allocate IRQ %u, DISABLING IT\n",
                                 irq);
                } else {
                        dev->irq = irq;
                        /* Enable AI commands */
                        s = &dev->subdevices[0];
                        s->subdev_flags |= SDF_CMD_READ;
                        s->do_cmdtest = pci9118_ai_cmdtest;
                        s->do_cmd = pci9118_ai_cmd;
                }
        }

        pci9118_report_attach(dev, irq);
        return 0;
}

static int pci9118_attach(struct comedi_device *dev,
                          struct comedi_devconfig *it)
{
        struct pci9118_private *devpriv;
        struct pci_dev *pcidev;
        int ext_mux, disable_irq, master, softsshdelay, hw_err_mask;

        ext_mux = it->options[2];
        master = ((it->options[3] & 1) == 0);
        disable_irq = ((it->options[3] & 2) != 0);
        softsshdelay = it->options[4];
        hw_err_mask = it->options[5];

        devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
        if (!devpriv)
                return -ENOMEM;
        dev->private = devpriv;

        pcidev = pci9118_find_pci(dev, it);
        if (!pcidev)
                return -EIO;
        comedi_set_hw_dev(dev, &pcidev->dev);

        return pci9118_common_attach(dev, disable_irq, master, ext_mux,
                                     softsshdelay, hw_err_mask);
}

static int pci9118_auto_attach(struct comedi_device *dev,
                                         unsigned long context_unused)
{
        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
        struct pci9118_private *devpriv;

        devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
        if (!devpriv)
                return -ENOMEM;
        dev->private = devpriv;

        dev->board_ptr = pci9118_find_boardinfo(pcidev);
        if (dev->board_ptr == NULL) {
                dev_err(dev->class_dev,
                        "adl_pci9118: cannot determine board type for pci %s\n",
                        pci_name(pcidev));
                return -EINVAL;
        }
        /*
         * Need to 'get' the PCI device to match the 'put' in pci9118_detach().
         * (The 'put' also matches the implicit 'get' by pci9118_find_pci().)
         */
        pci_dev_get(pcidev);
        /* Don't disable irq, use bus master, no external mux,
         * no sample-hold delay, no error mask. */
        return pci9118_common_attach(dev, 0, 1, 0, 0, 0);
}

static void pci9118_detach(struct comedi_device *dev)
{
        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
        struct pci9118_private *devpriv = dev->private;

        if (devpriv) {
                if (devpriv->valid)
                        pci9118_reset(dev);
                if (dev->irq)
                        free_irq(dev->irq, dev);
                if (devpriv->dmabuf_virt[0])
                        free_pages((unsigned long)devpriv->dmabuf_virt[0],
                                   devpriv->dmabuf_pages[0]);
                if (devpriv->dmabuf_virt[1])
                        free_pages((unsigned long)devpriv->dmabuf_virt[1],
                                   devpriv->dmabuf_pages[1]);
        }
        if (pcidev) {
                if (dev->iobase)
                        comedi_pci_disable(pcidev);

                pci_dev_put(pcidev);
        }
}

static struct comedi_driver adl_pci9118_driver = {
        .driver_name    = "adl_pci9118",
        .module         = THIS_MODULE,
        .attach         = pci9118_attach,
        .auto_attach    = pci9118_auto_attach,
        .detach         = pci9118_detach,
        .num_names      = ARRAY_SIZE(boardtypes),
        .board_name     = &boardtypes[0].name,
        .offset         = sizeof(struct boardtype),
};

static int adl_pci9118_pci_probe(struct pci_dev *dev,
                                           const struct pci_device_id *ent)
{
        return comedi_pci_auto_config(dev, &adl_pci9118_driver);
}

static DEFINE_PCI_DEVICE_TABLE(adl_pci9118_pci_table) = {
        { PCI_DEVICE(PCI_VENDOR_ID_AMCC, 0x80d9) },
        { 0 }
};
MODULE_DEVICE_TABLE(pci, adl_pci9118_pci_table);

static struct pci_driver adl_pci9118_pci_driver = {
        .name           = "adl_pci9118",
        .id_table       = adl_pci9118_pci_table,
        .probe          = adl_pci9118_pci_probe,
        .remove         = comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(adl_pci9118_driver, adl_pci9118_pci_driver);

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