diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/das800.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/das800.c | 894 |
1 files changed, 894 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c new file mode 100644 index 000000000000..7a6656bf809c --- /dev/null +++ b/drivers/staging/comedi/drivers/das800.c @@ -0,0 +1,894 @@ +/* + comedi/drivers/das800.c + Driver for Keitley das800 series boards and compatibles + Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net> + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 2000 David A. Schleef <ds@schleef.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +************************************************************************ +*/ +/* +Driver: das800 +Description: Keithley Metrabyte DAS800 (& compatibles) +Author: Frank Mori Hess <fmhess@users.sourceforge.net> +Devices: [Keithley Metrabyte] DAS-800 (das-800), DAS-801 (das-801), + DAS-802 (das-802), + [Measurement Computing] CIO-DAS800 (cio-das800), + CIO-DAS801 (cio-das801), CIO-DAS802 (cio-das802), + CIO-DAS802/16 (cio-das802/16) +Status: works, cio-das802/16 untested - email me if you have tested it + +Configuration options: + [0] - I/O port base address + [1] - IRQ (optional, required for timed or externally triggered conversions) + +Notes: + IRQ can be omitted, although the cmd interface will not work without it. + + All entries in the channel/gain list must use the same gain and be + consecutive channels counting upwards in channel number (these are + hardware limitations.) + + I've never tested the gain setting stuff since I only have a + DAS-800 board with fixed gain. + + The cio-das802/16 does not have a fifo-empty status bit! Therefore + only fifo-half-full transfers are possible with this card. +*/ +/* + +cmd triggers supported: + start_src: TRIG_NOW | TRIG_EXT + scan_begin_src: TRIG_FOLLOW + scan_end_src: TRIG_COUNT + convert_src: TRIG_TIMER | TRIG_EXT + stop_src: TRIG_NONE | TRIG_COUNT + + +*/ + +#include "../comedidev.h" + +#include <linux/ioport.h> +#include <linux/delay.h> + +#include "8253.h" +#include "comedi_fc.h" + +#define DAS800_SIZE 8 +#define TIMER_BASE 1000 +#define N_CHAN_AI 8 // number of analog input channels + +/* Registers for the das800 */ + +#define DAS800_LSB 0 +#define FIFO_EMPTY 0x1 +#define FIFO_OVF 0x2 +#define DAS800_MSB 1 +#define DAS800_CONTROL1 2 +#define CONTROL1_INTE 0x8 +#define DAS800_CONV_CONTROL 2 +#define ITE 0x1 +#define CASC 0x2 +#define DTEN 0x4 +#define IEOC 0x8 +#define EACS 0x10 +#define CONV_HCEN 0x80 +#define DAS800_SCAN_LIMITS 2 +#define DAS800_STATUS 2 +#define IRQ 0x8 +#define BUSY 0x80 +#define DAS800_GAIN 3 +#define CIO_FFOV 0x8 // fifo overflow for cio-das802/16 +#define CIO_ENHF 0x90 // interrupt fifo half full for cio-das802/16 +#define CONTROL1 0x80 +#define CONV_CONTROL 0xa0 +#define SCAN_LIMITS 0xc0 +#define ID 0xe0 +#define DAS800_8254 4 +#define DAS800_STATUS2 7 +#define STATUS2_HCEN 0x80 +#define STATUS2_INTE 0X20 +#define DAS800_ID 7 + +struct das800_board { + const char *name; + int ai_speed; + const struct comedi_lrange *ai_range; + int resolution; +}; + +//analog input ranges +static const struct comedi_lrange range_das800_ai = { + 1, + { + RANGE(-5, 5), + } +}; + +static const struct comedi_lrange range_das801_ai = { + 9, + { + RANGE(-5, 5), + RANGE(-10, 10), + RANGE(0, 10), + RANGE(-0.5, 0.5), + RANGE(0, 1), + RANGE(-0.05, 0.05), + RANGE(0, 0.1), + RANGE(-0.01, 0.01), + RANGE(0, 0.02), + } +}; + +static const struct comedi_lrange range_cio_das801_ai = { + 9, + { + RANGE(-5, 5), + RANGE(-10, 10), + RANGE(0, 10), + RANGE(-0.5, 0.5), + RANGE(0, 1), + RANGE(-0.05, 0.05), + RANGE(0, 0.1), + RANGE(-0.005, 0.005), + RANGE(0, 0.01), + } +}; + +static const struct comedi_lrange range_das802_ai = { + 9, + { + RANGE(-5, 5), + RANGE(-10, 10), + RANGE(0, 10), + RANGE(-2.5, 2.5), + RANGE(0, 5), + RANGE(-1.25, 1.25), + RANGE(0, 2.5), + RANGE(-0.625, 0.625), + RANGE(0, 1.25), + } +}; + +static const struct comedi_lrange range_das80216_ai = { + 8, + { + RANGE(-10, 10), + RANGE(0, 10), + RANGE(-5, 5), + RANGE(0, 5), + RANGE(-2.5, 2.5), + RANGE(0, 2.5), + RANGE(-1.25, 1.25), + RANGE(0, 1.25), + } +}; + +enum { das800, ciodas800, das801, ciodas801, das802, ciodas802, ciodas80216 }; + +static const struct das800_board das800_boards[] = { + { + name: "das-800", + ai_speed:25000, + ai_range:&range_das800_ai, + resolution:12, + }, + { + name: "cio-das800", + ai_speed:20000, + ai_range:&range_das800_ai, + resolution:12, + }, + { + name: "das-801", + ai_speed:25000, + ai_range:&range_das801_ai, + resolution:12, + }, + { + name: "cio-das801", + ai_speed:20000, + ai_range:&range_cio_das801_ai, + resolution:12, + }, + { + name: "das-802", + ai_speed:25000, + ai_range:&range_das802_ai, + resolution:12, + }, + { + name: "cio-das802", + ai_speed:20000, + ai_range:&range_das802_ai, + resolution:12, + }, + { + name: "cio-das802/16", + ai_speed:10000, + ai_range:&range_das80216_ai, + resolution:16, + }, +}; + +/* + * Useful for shorthand access to the particular board structure + */ +#define thisboard ((const struct das800_board *)dev->board_ptr) + +struct das800_private { + volatile unsigned int count; /* number of data points left to be taken */ + volatile int forever; /* flag indicating whether we should take data forever */ + unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */ + unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */ + volatile int do_bits; /* digital output bits */ +}; + +#define devpriv ((struct das800_private *)dev->private) + +static int das800_attach(struct comedi_device * dev, struct comedi_devconfig * it); +static int das800_detach(struct comedi_device * dev); +static int das800_cancel(struct comedi_device * dev, struct comedi_subdevice * s); + +static struct comedi_driver driver_das800 = { + driver_name:"das800", + module:THIS_MODULE, + attach:das800_attach, + detach:das800_detach, + num_names:sizeof(das800_boards) / sizeof(struct das800_board), + board_name:&das800_boards[0].name, + offset:sizeof(struct das800_board), +}; + +static irqreturn_t das800_interrupt(int irq, void *d PT_REGS_ARG); +static void enable_das800(struct comedi_device * dev); +static void disable_das800(struct comedi_device * dev); +static int das800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_cmd * cmd); +static int das800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s); +static int das800_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); +static int das800_di_rbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); +static int das800_do_wbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data); +static int das800_probe(struct comedi_device * dev); +static int das800_set_frequency(struct comedi_device * dev); + +/* checks and probes das-800 series board type */ +static int das800_probe(struct comedi_device * dev) +{ + int id_bits; + unsigned long irq_flags; + int board; + + // 'comedi spin lock irqsave' disables even rt interrupts, we use them to protect indirect addressing + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(ID, dev->iobase + DAS800_GAIN); /* select base address + 7 to be ID register */ + id_bits = inb(dev->iobase + DAS800_ID) & 0x3; /* get id bits */ + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + board = thisboard - das800_boards; + + switch (id_bits) { + case 0x0: + if (board == das800) { + printk(" Board model: DAS-800\n"); + return board; + } + if (board == ciodas800) { + printk(" Board model: CIO-DAS800\n"); + return board; + } + printk(" Board model (probed): DAS-800\n"); + return das800; + break; + case 0x2: + if (board == das801) { + printk(" Board model: DAS-801\n"); + return board; + } + if (board == ciodas801) { + printk(" Board model: CIO-DAS801\n"); + return board; + } + printk(" Board model (probed): DAS-801\n"); + return das801; + break; + case 0x3: + if (board == das802) { + printk(" Board model: DAS-802\n"); + return board; + } + if (board == ciodas802) { + printk(" Board model: CIO-DAS802\n"); + return board; + } + if (board == ciodas80216) { + printk(" Board model: CIO-DAS802/16\n"); + return board; + } + printk(" Board model (probed): DAS-802\n"); + return das802; + break; + default: + printk(" Board model: probe returned 0x%x (unknown)\n", + id_bits); + return board; + break; + } + return -1; +} + +/* + * A convenient macro that defines init_module() and cleanup_module(), + * as necessary. + */ +COMEDI_INITCLEANUP(driver_das800); + +/* interrupt service routine */ +static irqreturn_t das800_interrupt(int irq, void *d PT_REGS_ARG) +{ + short i; /* loop index */ + short dataPoint = 0; + struct comedi_device *dev = d; + struct comedi_subdevice *s = dev->read_subdev; /* analog input subdevice */ + struct comedi_async *async; + int status; + unsigned long irq_flags; + static const int max_loops = 128; // half-fifo size for cio-das802/16 + // flags + int fifo_empty = 0; + int fifo_overflow = 0; + + status = inb(dev->iobase + DAS800_STATUS); + /* if interrupt was not generated by board or driver not attached, quit */ + if (!(status & IRQ)) + return IRQ_NONE; + if (!(dev->attached)) + return IRQ_HANDLED; + + /* wait until here to initialize async, since we will get null dereference + * if interrupt occurs before driver is fully attached! + */ + async = s->async; + + // if hardware conversions are not enabled, then quit + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select base address + 7 to be STATUS2 register */ + status = inb(dev->iobase + DAS800_STATUS2) & STATUS2_HCEN; + /* don't release spinlock yet since we want to make sure noone else disables hardware conversions */ + if (status == 0) { + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + return IRQ_HANDLED; + } + + /* loop while card's fifo is not empty (and limit to half fifo for cio-das802/16) */ + for (i = 0; i < max_loops; i++) { + /* read 16 bits from dev->iobase and dev->iobase + 1 */ + dataPoint = inb(dev->iobase + DAS800_LSB); + dataPoint += inb(dev->iobase + DAS800_MSB) << 8; + if (thisboard->resolution == 12) { + fifo_empty = dataPoint & FIFO_EMPTY; + fifo_overflow = dataPoint & FIFO_OVF; + if (fifo_overflow) + break; + } else { + fifo_empty = 0; // cio-das802/16 has no fifo empty status bit + } + if (fifo_empty) { + break; + } + /* strip off extraneous bits for 12 bit cards */ + if (thisboard->resolution == 12) + dataPoint = (dataPoint >> 4) & 0xfff; + /* if there are more data points to collect */ + if (devpriv->count > 0 || devpriv->forever == 1) { + /* write data point to buffer */ + cfc_write_to_buffer(s, dataPoint); + if (devpriv->count > 0) + devpriv->count--; + } + } + async->events |= COMEDI_CB_BLOCK; + /* check for fifo overflow */ + if (thisboard->resolution == 12) { + fifo_overflow = dataPoint & FIFO_OVF; + // else cio-das802/16 + } else { + fifo_overflow = inb(dev->iobase + DAS800_GAIN) & CIO_FFOV; + } + if (fifo_overflow) { + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + comedi_error(dev, "DAS800 FIFO overflow"); + das800_cancel(dev, dev->subdevices + 0); + async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; + comedi_event(dev, s); + async->events = 0; + return IRQ_HANDLED; + } + if (devpriv->count > 0 || devpriv->forever == 1) { + /* Re-enable card's interrupt. + * We already have spinlock, so indirect addressing is safe */ + outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ + outb(CONTROL1_INTE | devpriv->do_bits, + dev->iobase + DAS800_CONTROL1); + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + /* otherwise, stop taking data */ + } else { + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + disable_das800(dev); /* diable hardware triggered conversions */ + async->events |= COMEDI_CB_EOA; + } + comedi_event(dev, s); + async->events = 0; + return IRQ_HANDLED; +} + +static int das800_attach(struct comedi_device * dev, struct comedi_devconfig * it) +{ + struct comedi_subdevice *s; + unsigned long iobase = it->options[0]; + unsigned int irq = it->options[1]; + unsigned long irq_flags; + int board; + + printk("comedi%d: das800: io 0x%lx", dev->minor, iobase); + if (irq) { + printk(", irq %u", irq); + } + printk("\n"); + + /* allocate and initialize dev->private */ + if (alloc_private(dev, sizeof(struct das800_private)) < 0) + return -ENOMEM; + + if (iobase == 0) { + printk("io base address required for das800\n"); + return -EINVAL; + } + + /* check if io addresses are available */ + if (!request_region(iobase, DAS800_SIZE, "das800")) { + printk("I/O port conflict\n"); + return -EIO; + } + dev->iobase = iobase; + + board = das800_probe(dev); + if (board < 0) { + printk("unable to determine board type\n"); + return -ENODEV; + } + dev->board_ptr = das800_boards + board; + + /* grab our IRQ */ + if (irq == 1 || irq > 7) { + printk("irq out of range\n"); + return -EINVAL; + } + if (irq) { + if (comedi_request_irq(irq, das800_interrupt, 0, "das800", dev)) { + printk("unable to allocate irq %u\n", irq); + return -EINVAL; + } + } + dev->irq = irq; + + dev->board_name = thisboard->name; + + if (alloc_subdevices(dev, 3) < 0) + return -ENOMEM; + + /* analog input subdevice */ + s = dev->subdevices + 0; + dev->read_subdev = s; + s->type = COMEDI_SUBD_AI; + s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ; + s->n_chan = 8; + s->len_chanlist = 8; + s->maxdata = (1 << thisboard->resolution) - 1; + s->range_table = thisboard->ai_range; + s->do_cmd = das800_ai_do_cmd; + s->do_cmdtest = das800_ai_do_cmdtest; + s->insn_read = das800_ai_rinsn; + s->cancel = das800_cancel; + + /* di */ + s = dev->subdevices + 1; + s->type = COMEDI_SUBD_DI; + s->subdev_flags = SDF_READABLE; + s->n_chan = 3; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = das800_di_rbits; + + /* do */ + s = dev->subdevices + 2; + s->type = COMEDI_SUBD_DO; + s->subdev_flags = SDF_WRITABLE | SDF_READABLE; + s->n_chan = 4; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = das800_do_wbits; + + disable_das800(dev); + + /* initialize digital out channels */ + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ + outb(CONTROL1_INTE | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + return 0; +}; + +static int das800_detach(struct comedi_device * dev) +{ + printk("comedi%d: das800: remove\n", dev->minor); + + /* only free stuff if it has been allocated by _attach */ + if (dev->iobase) + release_region(dev->iobase, DAS800_SIZE); + if (dev->irq) + comedi_free_irq(dev->irq, dev); + return 0; +}; + +static int das800_cancel(struct comedi_device * dev, struct comedi_subdevice * s) +{ + devpriv->forever = 0; + devpriv->count = 0; + disable_das800(dev); + return 0; +} + +/* enable_das800 makes the card start taking hardware triggered conversions */ +static void enable_das800(struct comedi_device * dev) +{ + unsigned long irq_flags; + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + // enable fifo-half full interrupts for cio-das802/16 + if (thisboard->resolution == 16) + outb(CIO_ENHF, dev->iobase + DAS800_GAIN); + outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ + outb(CONV_HCEN, dev->iobase + DAS800_CONV_CONTROL); /* enable hardware triggering */ + outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ + outb(CONTROL1_INTE | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); /* enable card's interrupt */ + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); +} + +/* disable_das800 stops hardware triggered conversions */ +static void disable_das800(struct comedi_device * dev) +{ + unsigned long irq_flags; + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ + outb(0x0, dev->iobase + DAS800_CONV_CONTROL); /* disable hardware triggering of conversions */ + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); +} + +static int das800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_cmd * cmd) +{ + int err = 0; + int tmp; + int gain, startChan; + int i; + + /* step 1: make sure trigger sources are trivially valid */ + + tmp = cmd->start_src; + cmd->start_src &= TRIG_NOW | TRIG_EXT; + if (!cmd->start_src || tmp != cmd->start_src) + err++; + + tmp = cmd->scan_begin_src; + cmd->scan_begin_src &= TRIG_FOLLOW; + 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 */ + + if (cmd->start_src != TRIG_NOW && cmd->start_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++; + } + if (cmd->convert_src == TRIG_TIMER) { + if (cmd->convert_arg < thisboard->ai_speed) { + cmd->convert_arg = thisboard->ai_speed; + err++; + } + } + if (!cmd->chanlist_len) { + cmd->chanlist_len = 1; + 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) { + 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->convert_src == TRIG_TIMER) { + tmp = cmd->convert_arg; + /* calculate counter values that give desired timing */ + i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), + &(devpriv->divisor2), &(cmd->convert_arg), + cmd->flags & TRIG_ROUND_MASK); + if (tmp != cmd->convert_arg) + err++; + } + + if (err) + return 4; + + // check channel/gain list against card's limitations + if (cmd->chanlist) { + gain = CR_RANGE(cmd->chanlist[0]); + startChan = CR_CHAN(cmd->chanlist[0]); + for (i = 1; i < cmd->chanlist_len; i++) { + if (CR_CHAN(cmd->chanlist[i]) != + (startChan + i) % N_CHAN_AI) { + 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 das800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s) +{ + int startChan, endChan, scan, gain; + int conv_bits; + unsigned long irq_flags; + struct comedi_async *async = s->async; + + if (!dev->irq) { + comedi_error(dev, + "no irq assigned for das-800, cannot do hardware conversions"); + return -1; + } + + disable_das800(dev); + + /* set channel scan limits */ + startChan = CR_CHAN(async->cmd.chanlist[0]); + endChan = (startChan + async->cmd.chanlist_len - 1) % 8; + scan = (endChan << 3) | startChan; + + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(SCAN_LIMITS, dev->iobase + DAS800_GAIN); /* select base address + 2 to be scan limits register */ + outb(scan, dev->iobase + DAS800_SCAN_LIMITS); /* set scan limits */ + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + /* set gain */ + gain = CR_RANGE(async->cmd.chanlist[0]); + if (thisboard->resolution == 12 && gain > 0) + gain += 0x7; + gain &= 0xf; + outb(gain, dev->iobase + DAS800_GAIN); + + switch (async->cmd.stop_src) { + case TRIG_COUNT: + devpriv->count = async->cmd.stop_arg * async->cmd.chanlist_len; + devpriv->forever = 0; + break; + case TRIG_NONE: + devpriv->forever = 1; + devpriv->count = 0; + break; + default: + break; + } + + /* enable auto channel scan, send interrupts on end of conversion + * and set clock source to internal or external + */ + conv_bits = 0; + conv_bits |= EACS | IEOC; + if (async->cmd.start_src == TRIG_EXT) + conv_bits |= DTEN; + switch (async->cmd.convert_src) { + case TRIG_TIMER: + conv_bits |= CASC | ITE; + /* set conversion frequency */ + i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), + &(devpriv->divisor2), &(async->cmd.convert_arg), + async->cmd.flags & TRIG_ROUND_MASK); + if (das800_set_frequency(dev) < 0) { + comedi_error(dev, "Error setting up counters"); + return -1; + } + break; + case TRIG_EXT: + break; + default: + break; + } + + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ + outb(conv_bits, dev->iobase + DAS800_CONV_CONTROL); + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + async->events = 0; + enable_das800(dev); + return 0; +} + +static int das800_ai_rinsn(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + int i, n; + int chan; + int range; + int lsb, msb; + int timeout = 1000; + unsigned long irq_flags; + + disable_das800(dev); /* disable hardware conversions (enables software conversions) */ + + /* set multiplexer */ + chan = CR_CHAN(insn->chanspec); + + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ + outb(chan | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + /* set gain / range */ + range = CR_RANGE(insn->chanspec); + if (thisboard->resolution == 12 && range) + range += 0x7; + range &= 0xf; + outb(range, dev->iobase + DAS800_GAIN); + + comedi_udelay(5); + + for (n = 0; n < insn->n; n++) { + /* trigger conversion */ + outb_p(0, dev->iobase + DAS800_MSB); + + for (i = 0; i < timeout; i++) { + if (!(inb(dev->iobase + DAS800_STATUS) & BUSY)) + break; + } + if (i == timeout) { + comedi_error(dev, "timeout"); + return -ETIME; + } + lsb = inb(dev->iobase + DAS800_LSB); + msb = inb(dev->iobase + DAS800_MSB); + if (thisboard->resolution == 12) { + data[n] = (lsb >> 4) & 0xff; + data[n] |= (msb << 4); + } else { + data[n] = (msb << 8) | lsb; + } + } + + return n; +} + +static int das800_di_rbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + unsigned int bits; + + bits = inb(dev->iobase + DAS800_STATUS) >> 4; + bits &= 0x7; + data[1] = bits; + data[0] = 0; + + return 2; +} + +static int das800_do_wbits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + int wbits; + unsigned long irq_flags; + + // only set bits that have been masked + data[0] &= 0xf; + wbits = devpriv->do_bits >> 4; + wbits &= ~data[0]; + wbits |= data[0] & data[1]; + devpriv->do_bits = wbits << 4; + + comedi_spin_lock_irqsave(&dev->spinlock, irq_flags); + outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ + outb(devpriv->do_bits | CONTROL1_INTE, dev->iobase + DAS800_CONTROL1); + comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags); + + data[1] = wbits; + + return 2; +} + +/* loads counters with divisor1, divisor2 from private structure */ +static int das800_set_frequency(struct comedi_device * dev) +{ + int err = 0; + + if (i8254_load(dev->iobase + DAS800_8254, 0, 1, devpriv->divisor1, 2)) + err++; + if (i8254_load(dev->iobase + DAS800_8254, 0, 2, devpriv->divisor2, 2)) + err++; + if (err) + return -1; + + return 0; +} |