/* comedi/drivers/dmm32at.c Diamond Systems mm32at code for a Comedi driver COMEDI - Linux Control and Measurement Device Interface Copyright (C) 2000 David A. Schleef This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* Driver: dmm32at Description: Diamond Systems mm32at driver. Devices: Author: Perry J. Piplani Updated: Fri Jun 4 09:13:24 CDT 2004 Status: experimental This driver is for the Diamond Systems MM-32-AT board http://www.diamondsystems.com/products/diamondmm32at It is being used on serveral projects inside NASA, without problems so far. For analog input commands, TRIG_EXT is not yet supported at all.. Configuration Options: comedi_config /dev/comedi0 dmm32at baseaddr,irq */ /* * The previous block comment is used to automatically generate * documentation in Comedi and Comedilib. The fields: * * Driver: the name of the driver * Description: a short phrase describing the driver. Don't list boards. * Devices: a full list of the boards that attempt to be supported by * the driver. Format is "(manufacturer) board name [comedi name]", * where comedi_name is the name that is used to configure the board. * See the comment near board_name: in the struct comedi_driver structure * below. If (manufacturer) or [comedi name] is missing, the previous * value is used. * Author: you * Updated: date when the _documentation_ was last updated. Use 'date -R' * to get a value for this. * Status: a one-word description of the status. Valid values are: * works - driver works correctly on most boards supported, and * passes comedi_test. * unknown - unknown. Usually put there by ds. * experimental - may not work in any particular release. Author * probably wants assistance testing it. * bitrotten - driver has not been update in a long time, probably * doesn't work, and probably is missing support for significant * Comedi interface features. * untested - author probably wrote it "blind", and is believed to * work, but no confirmation. * * These headers should be followed by a blank line, and any comments * you wish to say about the driver. The comment area is the place * to put any known bugs, limitations, unsupported features, supported * command triggers, whether or not commands are supported on particular * subdevices, etc. * * Somewhere in the comment should be information about configuration * options that are used with comedi_config. */ #include "../comedidev.h" #include /* Board register addresses */ #define DMM32AT_MEMSIZE 0x10 #define DMM32AT_CONV 0x00 #define DMM32AT_AILSB 0x00 #define DMM32AT_AUXDOUT 0x01 #define DMM32AT_AIMSB 0x01 #define DMM32AT_AILOW 0x02 #define DMM32AT_AIHIGH 0x03 #define DMM32AT_DACLSB 0x04 #define DMM32AT_DACSTAT 0x04 #define DMM32AT_DACMSB 0x05 #define DMM32AT_FIFOCNTRL 0x07 #define DMM32AT_FIFOSTAT 0x07 #define DMM32AT_CNTRL 0x08 #define DMM32AT_AISTAT 0x08 #define DMM32AT_INTCLOCK 0x09 #define DMM32AT_CNTRDIO 0x0a #define DMM32AT_AICONF 0x0b #define DMM32AT_AIRBACK 0x0b #define DMM32AT_CLK1 0x0d #define DMM32AT_CLK2 0x0e #define DMM32AT_CLKCT 0x0f #define DMM32AT_DIOA 0x0c #define DMM32AT_DIOB 0x0d #define DMM32AT_DIOC 0x0e #define DMM32AT_DIOCONF 0x0f #define dmm_inb(cdev,reg) inb((cdev->iobase)+reg) #define dmm_outb(cdev,reg,valu) outb(valu,(cdev->iobase)+reg) /* Board register values. */ /* DMM32AT_DACSTAT 0x04 */ #define DMM32AT_DACBUSY 0x80 /* DMM32AT_FIFOCNTRL 0x07 */ #define DMM32AT_FIFORESET 0x02 #define DMM32AT_SCANENABLE 0x04 /* DMM32AT_CNTRL 0x08 */ #define DMM32AT_RESET 0x20 #define DMM32AT_INTRESET 0x08 #define DMM32AT_CLKACC 0x00 #define DMM32AT_DIOACC 0x01 /* DMM32AT_AISTAT 0x08 */ #define DMM32AT_STATUS 0x80 /* DMM32AT_INTCLOCK 0x09 */ #define DMM32AT_ADINT 0x80 #define DMM32AT_CLKSEL 0x03 /* DMM32AT_CNTRDIO 0x0a */ #define DMM32AT_FREQ12 0x80 /* DMM32AT_AICONF 0x0b */ #define DMM32AT_RANGE_U10 0x0c #define DMM32AT_RANGE_U5 0x0d #define DMM32AT_RANGE_B10 0x08 #define DMM32AT_RANGE_B5 0x00 #define DMM32AT_SCINT_20 0x00 #define DMM32AT_SCINT_15 0x10 #define DMM32AT_SCINT_10 0x20 #define DMM32AT_SCINT_5 0x30 /* DMM32AT_CLKCT 0x0f */ #define DMM32AT_CLKCT1 0x56 /* mode3 counter 1 - write low byte only */ #define DMM32AT_CLKCT2 0xb6 /* mode3 counter 2 - write high and low byte */ /* DMM32AT_DIOCONF 0x0f */ #define DMM32AT_DIENABLE 0x80 #define DMM32AT_DIRA 0x10 #define DMM32AT_DIRB 0x02 #define DMM32AT_DIRCL 0x01 #define DMM32AT_DIRCH 0x08 /* board AI ranges in comedi structure */ static const struct comedi_lrange dmm32at_airanges = { 4, { UNI_RANGE(10), UNI_RANGE(5), BIP_RANGE(10), BIP_RANGE(5), } }; /* register values for above ranges */ static const unsigned char dmm32at_rangebits[] = { DMM32AT_RANGE_U10, DMM32AT_RANGE_U5, DMM32AT_RANGE_B10, DMM32AT_RANGE_B5, }; /* only one of these ranges is valid, as set by a jumper on the * board. The application should only use the range set by the jumper */ static const struct comedi_lrange dmm32at_aoranges = { 4, { UNI_RANGE(10), UNI_RANGE(5), BIP_RANGE(10), BIP_RANGE(5), } }; /* * Board descriptions for two imaginary boards. Describing the * boards in this way is optional, and completely driver-dependent. * Some drivers use arrays such as this, other do not. */ struct dmm32at_board { const char *name; int ai_chans; int ai_bits; const struct comedi_lrange *ai_ranges; int ao_chans; int ao_bits; const struct comedi_lrange *ao_ranges; int have_dio; int dio_chans; }; static const struct dmm32at_board dmm32at_boards[] = { { name: "dmm32at", ai_chans:32, ai_bits: 16, ai_ranges:&dmm32at_airanges, ao_chans:4, ao_bits: 12, ao_ranges:&dmm32at_aoranges, have_dio:1, dio_chans:24, }, }; /* * Useful for shorthand access to the particular board structure */ #define thisboard ((const struct dmm32at_board *)dev->board_ptr) /* this structure is for data unique to this hardware driver. If * several hardware drivers keep similar information in this structure, * feel free to suggest moving the variable to the struct comedi_device struct. */ struct dmm32at_private { int data; int ai_inuse; unsigned int ai_scans_left; /* Used for AO readback */ unsigned int ao_readback[4]; unsigned char dio_config; }; /* * most drivers define the following macro to make it easy to * access the private structure. */ #define devpriv ((struct dmm32at_private *)dev->private) /* * The struct comedi_driver structure tells the Comedi core module * which functions to call to configure/deconfigure (attach/detach) * the board, and also about the kernel module that contains * the device code. */ static int dmm32at_attach(struct comedi_device * dev, struct comedi_devconfig * it); static int dmm32at_detach(struct comedi_device * dev); static struct comedi_driver driver_dmm32at = { driver_name:"dmm32at", module:THIS_MODULE, attach:dmm32at_attach, detach:dmm32at_detach, /* It is not necessary to implement the following members if you are * writing a driver for a ISA PnP or PCI card */ /* Most drivers will support multiple types of boards by * having an array of board structures. These were defined * in dmm32at_boards[] above. Note that the element 'name' * was first in the structure -- Comedi uses this fact to * extract the name of the board without knowing any details * about the structure except for its length. * When a device is attached (by comedi_config), the name * of the device is given to Comedi, and Comedi tries to * match it by going through the list of board names. If * there is a match, the address of the pointer is put * into dev->board_ptr and driver->attach() is called. * * Note that these are not necessary if you can determine * the type of board in software. ISA PnP, PCI, and PCMCIA * devices are such boards. */ board_name:&dmm32at_boards[0].name, offset:sizeof(struct dmm32at_board), num_names:sizeof(dmm32at_boards) / sizeof(struct dmm32at_board), }; /* prototypes for driver functions below */ static int dmm32at_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data); static int dmm32at_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data); static int dmm32at_ao_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data); static int dmm32at_dio_insn_bits(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data); static int dmm32at_dio_insn_config(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data); static int dmm32at_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_cmd * cmd); static int dmm32at_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s); static int dmm32at_ai_cancel(struct comedi_device * dev, struct comedi_subdevice * s); static int dmm32at_ns_to_timer(unsigned int *ns, int round); static irqreturn_t dmm32at_isr(int irq, void *d PT_REGS_ARG); void dmm32at_setaitimer(struct comedi_device * dev, unsigned int nansec); /* * Attach is called by the Comedi core to configure the driver * for a particular board. If you specified a board_name array * in the driver structure, dev->board_ptr contains that * address. */ static int dmm32at_attach(struct comedi_device * dev, struct comedi_devconfig * it) { int ret; struct comedi_subdevice *s; unsigned char aihi, ailo, fifostat, aistat, intstat, airback; unsigned long iobase; unsigned int irq; iobase = it->options[0]; irq = it->options[1]; printk("comedi%d: dmm32at: attaching\n", dev->minor); printk("dmm32at: probing at address 0x%04lx, irq %u\n", iobase, irq); /* register address space */ if (!request_region(iobase, DMM32AT_MEMSIZE, thisboard->name)) { printk("I/O port conflict\n"); return -EIO; } dev->iobase = iobase; /* the following just makes sure the board is there and gets it to a known state */ /* reset the board */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_RESET); /* allow a millisecond to reset */ udelay(1000); /* zero scan and fifo control */ dmm_outb(dev, DMM32AT_FIFOCNTRL, 0x0); /* zero interrupt and clock control */ dmm_outb(dev, DMM32AT_INTCLOCK, 0x0); /* write a test channel range, the high 3 bits should drop */ dmm_outb(dev, DMM32AT_AILOW, 0x80); dmm_outb(dev, DMM32AT_AIHIGH, 0xff); /* set the range at 10v unipolar */ dmm_outb(dev, DMM32AT_AICONF, DMM32AT_RANGE_U10); /* should take 10 us to settle, here's a hundred */ udelay(100); /* read back the values */ ailo = dmm_inb(dev, DMM32AT_AILOW); aihi = dmm_inb(dev, DMM32AT_AIHIGH); fifostat = dmm_inb(dev, DMM32AT_FIFOSTAT); aistat = dmm_inb(dev, DMM32AT_AISTAT); intstat = dmm_inb(dev, DMM32AT_INTCLOCK); airback = dmm_inb(dev, DMM32AT_AIRBACK); printk("dmm32at: lo=0x%02x hi=0x%02x fifostat=0x%02x\n", ailo, aihi, fifostat); printk("dmm32at: aistat=0x%02x intstat=0x%02x airback=0x%02x\n", aistat, intstat, airback); if ((ailo != 0x00) || (aihi != 0x1f) || (fifostat != 0x80) || (aistat != 0x60 || (intstat != 0x00) || airback != 0x0c)) { printk("dmmat32: board detection failed\n"); return -EIO; } /* board is there, register interrupt */ if (irq) { ret = comedi_request_irq(irq, dmm32at_isr, 0, thisboard->name, dev); if (ret < 0) { printk("irq conflict\n"); return ret; } dev->irq = irq; } /* * If you can probe the device to determine what device in a series * it is, this is the place to do it. Otherwise, dev->board_ptr * should already be initialized. */ //dev->board_ptr = dmm32at_probe(dev); /* * Initialize dev->board_name. Note that we can use the "thisboard" * macro now, since we just initialized it in the last line. */ dev->board_name = thisboard->name; /* * Allocate the private structure area. alloc_private() is a * convenient macro defined in comedidev.h. */ if (alloc_private(dev, sizeof(struct dmm32at_private)) < 0) return -ENOMEM; /* * Allocate the subdevice structures. alloc_subdevice() is a * convenient macro defined in comedidev.h. */ if (alloc_subdevices(dev, 3) < 0) return -ENOMEM; s = dev->subdevices + 0; dev->read_subdev = s; /* analog input subdevice */ s->type = COMEDI_SUBD_AI; /* we support single-ended (ground) and differential */ s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF | SDF_CMD_READ; s->n_chan = thisboard->ai_chans; s->maxdata = (1 << thisboard->ai_bits) - 1; s->range_table = thisboard->ai_ranges; s->len_chanlist = 32; /* This is the maximum chanlist length that the board can handle */ s->insn_read = dmm32at_ai_rinsn; s->do_cmd = dmm32at_ai_cmd; s->do_cmdtest = dmm32at_ai_cmdtest; s->cancel = dmm32at_ai_cancel; s = dev->subdevices + 1; /* analog output subdevice */ s->type = COMEDI_SUBD_AO; s->subdev_flags = SDF_WRITABLE; s->n_chan = thisboard->ao_chans; s->maxdata = (1 << thisboard->ao_bits) - 1; s->range_table = thisboard->ao_ranges; s->insn_write = dmm32at_ao_winsn; s->insn_read = dmm32at_ao_rinsn; s = dev->subdevices + 2; /* digital i/o subdevice */ if (thisboard->have_dio) { /* get access to the DIO regs */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC); /* set the DIO's to the defualt input setting */ devpriv->dio_config = DMM32AT_DIRA | DMM32AT_DIRB | DMM32AT_DIRCL | DMM32AT_DIRCH | DMM32AT_DIENABLE; dmm_outb(dev, DMM32AT_DIOCONF, devpriv->dio_config); /* set up the subdevice */ s->type = COMEDI_SUBD_DIO; s->subdev_flags = SDF_READABLE | SDF_WRITABLE; s->n_chan = thisboard->dio_chans; s->maxdata = 1; s->state = 0; s->range_table = &range_digital; s->insn_bits = dmm32at_dio_insn_bits; s->insn_config = dmm32at_dio_insn_config; } else { s->type = COMEDI_SUBD_UNUSED; } /* success */ printk("comedi%d: dmm32at: attached\n", dev->minor); return 1; } /* * _detach is called to deconfigure a device. It should deallocate * resources. * This function is also called when _attach() fails, so it should be * careful not to release resources that were not necessarily * allocated by _attach(). dev->private and dev->subdevices are * deallocated automatically by the core. */ static int dmm32at_detach(struct comedi_device * dev) { printk("comedi%d: dmm32at: remove\n", dev->minor); if (dev->irq) comedi_free_irq(dev->irq, dev); if (dev->iobase) release_region(dev->iobase, DMM32AT_MEMSIZE); return 0; } /* * "instructions" read/write data in "one-shot" or "software-triggered" * mode. */ static int dmm32at_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data) { int n, i; unsigned int d; unsigned char status; unsigned short msb, lsb; unsigned char chan; int range; /* get the channel and range number */ chan = CR_CHAN(insn->chanspec) & (s->n_chan - 1); range = CR_RANGE(insn->chanspec); //printk("channel=0x%02x, range=%d\n",chan,range); /* zero scan and fifo control and reset fifo */ dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_FIFORESET); /* write the ai channel range regs */ dmm_outb(dev, DMM32AT_AILOW, chan); dmm_outb(dev, DMM32AT_AIHIGH, chan); /* set the range bits */ dmm_outb(dev, DMM32AT_AICONF, dmm32at_rangebits[range]); /* wait for circuit to settle */ for (i = 0; i < 40000; i++) { status = dmm_inb(dev, DMM32AT_AIRBACK); if ((status & DMM32AT_STATUS) == 0) break; } if (i == 40000) { printk("timeout\n"); return -ETIMEDOUT; } /* convert n samples */ for (n = 0; n < insn->n; n++) { /* trigger conversion */ dmm_outb(dev, DMM32AT_CONV, 0xff); /* wait for conversion to end */ for (i = 0; i < 40000; i++) { status = dmm_inb(dev, DMM32AT_AISTAT); if ((status & DMM32AT_STATUS) == 0) break; } if (i == 40000) { printk("timeout\n"); return -ETIMEDOUT; } /* read data */ lsb = dmm_inb(dev, DMM32AT_AILSB); msb = dmm_inb(dev, DMM32AT_AIMSB); /* invert sign bit to make range unsigned, this is an idiosyncracy of the diamond board, it return conversions as a signed value, i.e. -32768 to 32767, flipping the bit and interpreting it as signed gives you a range of 0 to 65535 which is used by comedi */ d = ((msb ^ 0x0080) << 8) + lsb; data[n] = d; } /* return the number of samples read/written */ return n; } static int dmm32at_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_cmd * cmd) { int err = 0; int tmp; int start_chan, gain, i; //printk("dmmat32 in command test\n"); /* cmdtest tests a particular command to see if it is valid. * Using the cmdtest ioctl, a user can create a valid cmd * and then have it executes by the cmd ioctl. * * cmdtest returns 1,2,3,4 or 0, depending on which tests * the command passes. */ /* step 1: make sure trigger sources are trivially valid */ tmp = cmd->start_src; cmd->start_src &= TRIG_NOW; if (!cmd->start_src || tmp != cmd->start_src) err++; tmp = cmd->scan_begin_src; cmd->scan_begin_src &= TRIG_TIMER /*| TRIG_EXT */ ; if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) err++; tmp = cmd->convert_src; cmd->convert_src &= TRIG_TIMER /*| TRIG_EXT */ ; if (!cmd->convert_src || tmp != cmd->convert_src) err++; tmp = cmd->scan_end_src; cmd->scan_end_src &= TRIG_COUNT; if (!cmd->scan_end_src || tmp != cmd->scan_end_src) err++; tmp = cmd->stop_src; cmd->stop_src &= TRIG_COUNT | TRIG_NONE; if (!cmd->stop_src || tmp != cmd->stop_src) err++; if (err) return 1; /* step 2: make sure trigger sources are unique and mutually compatible */ /* note that mutual compatiblity is not an issue here */ if (cmd->scan_begin_src != TRIG_TIMER && cmd->scan_begin_src != TRIG_EXT) err++; if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) err++; if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE) err++; if (err) return 2; /* step 3: make sure arguments are trivially compatible */ if (cmd->start_arg != 0) { cmd->start_arg = 0; err++; } #define MAX_SCAN_SPEED 1000000 /* in nanoseconds */ #define MIN_SCAN_SPEED 1000000000 /* in nanoseconds */ if (cmd->scan_begin_src == TRIG_TIMER) { if (cmd->scan_begin_arg < MAX_SCAN_SPEED) { cmd->scan_begin_arg = MAX_SCAN_SPEED; err++; } if (cmd->scan_begin_arg > MIN_SCAN_SPEED) { cmd->scan_begin_arg = MIN_SCAN_SPEED; err++; } } else { /* external trigger */ /* should be level/edge, hi/lo specification here */ /* should specify multiple external triggers */ if (cmd->scan_begin_arg > 9) { cmd->scan_begin_arg = 9; err++; } } if (cmd->convert_src == TRIG_TIMER) { if (cmd->convert_arg >= 17500) cmd->convert_arg = 20000; else if (cmd->convert_arg >= 12500) cmd->convert_arg = 15000; else if (cmd->convert_arg >= 7500) cmd->convert_arg = 10000; else cmd->convert_arg = 5000; } else { /* external trigger */ /* see above */ if (cmd->convert_arg > 9) { cmd->convert_arg = 9; err++; } } if (cmd->scan_end_arg != cmd->chanlist_len) { cmd->scan_end_arg = cmd->chanlist_len; err++; } if (cmd->stop_src == TRIG_COUNT) { if (cmd->stop_arg > 0xfffffff0) { cmd->stop_arg = 0xfffffff0; err++; } if (cmd->stop_arg == 0) { cmd->stop_arg = 1; err++; } } else { /* TRIG_NONE */ if (cmd->stop_arg != 0) { cmd->stop_arg = 0; err++; } } if (err) return 3; /* step 4: fix up any arguments */ if (cmd->scan_begin_src == TRIG_TIMER) { tmp = cmd->scan_begin_arg; dmm32at_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK); if (tmp != cmd->scan_begin_arg) err++; } if (cmd->convert_src == TRIG_TIMER) { tmp = cmd->convert_arg; dmm32at_ns_to_timer(&cmd->convert_arg, cmd->flags & TRIG_ROUND_MASK); if (tmp != cmd->convert_arg) err++; if (cmd->scan_begin_src == TRIG_TIMER && cmd->scan_begin_arg < cmd->convert_arg * cmd->scan_end_arg) { cmd->scan_begin_arg = cmd->convert_arg * cmd->scan_end_arg; err++; } } if (err) return 4; /* step 5 check the channel list, the channel list for this board must be consecutive and gains must be the same */ if (cmd->chanlist) { gain = CR_RANGE(cmd->chanlist[0]); start_chan = CR_CHAN(cmd->chanlist[0]); for (i = 1; i < cmd->chanlist_len; i++) { if (CR_CHAN(cmd->chanlist[i]) != (start_chan + i) % s->n_chan) { comedi_error(dev, "entries in chanlist must be consecutive channels, counting upwards\n"); err++; } if (CR_RANGE(cmd->chanlist[i]) != gain) { comedi_error(dev, "entries in chanlist must all have the same gain\n"); err++; } } } if (err) return 5; return 0; } static int dmm32at_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s) { struct comedi_cmd *cmd = &s->async->cmd; int i, range; unsigned char chanlo, chanhi, status; if (!cmd->chanlist) return -EINVAL; /* get the channel list and range */ chanlo = CR_CHAN(cmd->chanlist[0]) & (s->n_chan - 1); chanhi = chanlo + cmd->chanlist_len - 1; if (chanhi >= s->n_chan) return -EINVAL; range = CR_RANGE(cmd->chanlist[0]); /* reset fifo */ dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_FIFORESET); /* set scan enable */ dmm_outb(dev, DMM32AT_FIFOCNTRL, DMM32AT_SCANENABLE); /* write the ai channel range regs */ dmm_outb(dev, DMM32AT_AILOW, chanlo); dmm_outb(dev, DMM32AT_AIHIGH, chanhi); /* set the range bits */ dmm_outb(dev, DMM32AT_AICONF, dmm32at_rangebits[range]); /* reset the interrupt just in case */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_INTRESET); if (cmd->stop_src == TRIG_COUNT) devpriv->ai_scans_left = cmd->stop_arg; else { /* TRIG_NONE */ devpriv->ai_scans_left = 0xffffffff; /* indicates TRIG_NONE to isr */ } /* wait for circuit to settle */ for (i = 0; i < 40000; i++) { status = dmm_inb(dev, DMM32AT_AIRBACK); if ((status & DMM32AT_STATUS) == 0) break; } if (i == 40000) { printk("timeout\n"); return -ETIMEDOUT; } if (devpriv->ai_scans_left > 1) { /* start the clock and enable the interrupts */ dmm32at_setaitimer(dev, cmd->scan_begin_arg); } else { /* start the interrups and initiate a single scan */ dmm_outb(dev, DMM32AT_INTCLOCK, DMM32AT_ADINT); dmm_outb(dev, DMM32AT_CONV, 0xff); } /* printk("dmmat32 in command\n"); */ /* for(i=0;ichanlist_len;i++) */ /* comedi_buf_put(s->async,i*100); */ /* s->async->events |= COMEDI_CB_EOA; */ /* comedi_event(dev, s); */ return 0; } static int dmm32at_ai_cancel(struct comedi_device * dev, struct comedi_subdevice * s) { devpriv->ai_scans_left = 1; return 0; } static irqreturn_t dmm32at_isr(int irq, void *d PT_REGS_ARG) { unsigned char intstat; unsigned int samp; unsigned short msb, lsb; int i; struct comedi_device *dev = d; if (!dev->attached) { comedi_error(dev, "spurious interrupt"); return IRQ_HANDLED; } intstat = dmm_inb(dev, DMM32AT_INTCLOCK); if (intstat & DMM32AT_ADINT) { struct comedi_subdevice *s = dev->read_subdev; struct comedi_cmd *cmd = &s->async->cmd; for (i = 0; i < cmd->chanlist_len; i++) { /* read data */ lsb = dmm_inb(dev, DMM32AT_AILSB); msb = dmm_inb(dev, DMM32AT_AIMSB); /* invert sign bit to make range unsigned */ samp = ((msb ^ 0x0080) << 8) + lsb; comedi_buf_put(s->async, samp); } if (devpriv->ai_scans_left != 0xffffffff) { /* TRIG_COUNT */ devpriv->ai_scans_left--; if (devpriv->ai_scans_left == 0) { /* disable further interrupts and clocks */ dmm_outb(dev, DMM32AT_INTCLOCK, 0x0); /* set the buffer to be flushed with an EOF */ s->async->events |= COMEDI_CB_EOA; } } /* flush the buffer */ comedi_event(dev, s); } /* reset the interrupt */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_INTRESET); return IRQ_HANDLED; } /* This function doesn't require a particular form, this is just * what happens to be used in some of the drivers. It should * convert ns nanoseconds to a counter value suitable for programming * the device. Also, it should adjust ns so that it cooresponds to * the actual time that the device will use. */ static int dmm32at_ns_to_timer(unsigned int *ns, int round) { /* trivial timer */ /* if your timing is done through two cascaded timers, the * i8253_cascade_ns_to_timer() function in 8253.h can be * very helpful. There are also i8254_load() and i8254_mm_load() * which can be used to load values into the ubiquitous 8254 counters */ return *ns; } static int dmm32at_ao_winsn(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data) { int i; int chan = CR_CHAN(insn->chanspec); unsigned char hi, lo, status; /* Writing a list of values to an AO channel is probably not * very useful, but that's how the interface is defined. */ for (i = 0; i < insn->n; i++) { devpriv->ao_readback[chan] = data[i]; /* get the low byte */ lo = data[i] & 0x00ff; /* high byte also contains channel number */ hi = (data[i] >> 8) + chan * (1 << 6); //printk("writing 0x%02x 0x%02x\n",hi,lo); /* write the low and high values to the board */ dmm_outb(dev, DMM32AT_DACLSB, lo); dmm_outb(dev, DMM32AT_DACMSB, hi); /* wait for circuit to settle */ for (i = 0; i < 40000; i++) { status = dmm_inb(dev, DMM32AT_DACSTAT); if ((status & DMM32AT_DACBUSY) == 0) break; } if (i == 40000) { printk("timeout\n"); return -ETIMEDOUT; } /* dummy read to update trigger the output */ status = dmm_inb(dev, DMM32AT_DACMSB); } /* return the number of samples read/written */ return i; } /* AO subdevices should have a read insn as well as a write insn. * Usually this means copying a value stored in devpriv. */ static int dmm32at_ao_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data) { int i; int chan = CR_CHAN(insn->chanspec); for (i = 0; i < insn->n; i++) data[i] = devpriv->ao_readback[chan]; return i; } /* DIO devices are slightly special. Although it is possible to * implement the insn_read/insn_write interface, it is much more * useful to applications if you implement the insn_bits interface. * This allows packed reading/writing of the DIO channels. The * comedi core can convert between insn_bits and insn_read/write */ static int dmm32at_dio_insn_bits(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data) { unsigned char diobits; if (insn->n != 2) return -EINVAL; /* The insn data is a mask in data[0] and the new data * in data[1], each channel cooresponding to a bit. */ if (data[0]) { s->state &= ~data[0]; s->state |= data[0] & data[1]; /* Write out the new digital output lines */ //outw(s->state,dev->iobase + DMM32AT_DIO); } /* get access to the DIO regs */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC); /* if either part of dio is set for output */ if (((devpriv->dio_config & DMM32AT_DIRCL) == 0) || ((devpriv->dio_config & DMM32AT_DIRCH) == 0)) { diobits = (s->state & 0x00ff0000) >> 16; dmm_outb(dev, DMM32AT_DIOC, diobits); } if ((devpriv->dio_config & DMM32AT_DIRB) == 0) { diobits = (s->state & 0x0000ff00) >> 8; dmm_outb(dev, DMM32AT_DIOB, diobits); } if ((devpriv->dio_config & DMM32AT_DIRA) == 0) { diobits = (s->state & 0x000000ff); dmm_outb(dev, DMM32AT_DIOA, diobits); } /* now read the state back in */ s->state = dmm_inb(dev, DMM32AT_DIOC); s->state <<= 8; s->state |= dmm_inb(dev, DMM32AT_DIOB); s->state <<= 8; s->state |= dmm_inb(dev, DMM32AT_DIOA); data[1] = s->state; /* on return, data[1] contains the value of the digital * input and output lines. */ //data[1]=inw(dev->iobase + DMM32AT_DIO); /* or we could just return the software copy of the output values if * it was a purely digital output subdevice */ //data[1]=s->state; return 2; } static int dmm32at_dio_insn_config(struct comedi_device * dev, struct comedi_subdevice * s, struct comedi_insn * insn, unsigned int * data) { unsigned char chanbit; int chan = CR_CHAN(insn->chanspec); if (insn->n != 1) return -EINVAL; if (chan < 8) chanbit = DMM32AT_DIRA; else if (chan < 16) chanbit = DMM32AT_DIRB; else if (chan < 20) chanbit = DMM32AT_DIRCL; else chanbit = DMM32AT_DIRCH; /* The input or output configuration of each digital line is * configured by a special insn_config instruction. chanspec * contains the channel to be changed, and data[0] contains the * value COMEDI_INPUT or COMEDI_OUTPUT. */ /* if output clear the bit, otherwise set it */ if (data[0] == COMEDI_OUTPUT) { devpriv->dio_config &= ~chanbit; } else { devpriv->dio_config |= chanbit; } /* get access to the DIO regs */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_DIOACC); /* set the DIO's to the new configuration setting */ dmm_outb(dev, DMM32AT_DIOCONF, devpriv->dio_config); return 1; } void dmm32at_setaitimer(struct comedi_device * dev, unsigned int nansec) { unsigned char lo1, lo2, hi2; unsigned short both2; /* based on 10mhz clock */ lo1 = 200; both2 = nansec / 20000; hi2 = (both2 & 0xff00) >> 8; lo2 = both2 & 0x00ff; /* set the counter frequency to 10mhz */ dmm_outb(dev, DMM32AT_CNTRDIO, 0); /* get access to the clock regs */ dmm_outb(dev, DMM32AT_CNTRL, DMM32AT_CLKACC); /* write the counter 1 control word and low byte to counter */ dmm_outb(dev, DMM32AT_CLKCT, DMM32AT_CLKCT1); dmm_outb(dev, DMM32AT_CLK1, lo1); /* write the counter 2 control word and low byte then to counter */ dmm_outb(dev, DMM32AT_CLKCT, DMM32AT_CLKCT2); dmm_outb(dev, DMM32AT_CLK2, lo2); dmm_outb(dev, DMM32AT_CLK2, hi2); /* enable the ai conversion interrupt and the clock to start scans */ dmm_outb(dev, DMM32AT_INTCLOCK, DMM32AT_ADINT | DMM32AT_CLKSEL); } /* * A convenient macro that defines init_module() and cleanup_module(), * as necessary. */ COMEDI_INITCLEANUP(driver_dmm32at);