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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.
*/
/*
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 <linux/interrupt.h>
#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 /* cio-das802/16 fifo overflow */
#define CIO_ENHF 0x90 /* cio-das802/16 fifo half full int ena */
#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
#define DAS802_16_HALF_FIFO_SZ 128
struct das800_board {
const char *name;
int ai_speed;
const struct comedi_lrange *ai_range;
int resolution;
};
static const struct comedi_lrange range_das801_ai = {
9, {
BIP_RANGE(5),
BIP_RANGE(10),
UNI_RANGE(10),
BIP_RANGE(0.5),
UNI_RANGE(1),
BIP_RANGE(0.05),
UNI_RANGE(0.1),
BIP_RANGE(0.01),
UNI_RANGE(0.02)
}
};
static const struct comedi_lrange range_cio_das801_ai = {
9, {
BIP_RANGE(5),
BIP_RANGE(10),
UNI_RANGE(10),
BIP_RANGE(0.5),
UNI_RANGE(1),
BIP_RANGE(0.05),
UNI_RANGE(0.1),
BIP_RANGE(0.005),
UNI_RANGE(0.01)
}
};
static const struct comedi_lrange range_das802_ai = {
9, {
BIP_RANGE(5),
BIP_RANGE(10),
UNI_RANGE(10),
BIP_RANGE(2.5),
UNI_RANGE(5),
BIP_RANGE(1.25),
UNI_RANGE(2.5),
BIP_RANGE(0.625),
UNI_RANGE(1.25)
}
};
static const struct comedi_lrange range_das80216_ai = {
8, {
BIP_RANGE(10),
UNI_RANGE(10),
BIP_RANGE(5),
UNI_RANGE(5),
BIP_RANGE(2.5),
UNI_RANGE(2.5),
BIP_RANGE(1.25),
UNI_RANGE(1.25)
}
};
enum das800_boardinfo {
BOARD_DAS800,
BOARD_CIODAS800,
BOARD_DAS801,
BOARD_CIODAS801,
BOARD_DAS802,
BOARD_CIODAS802,
BOARD_CIODAS80216,
};
static const struct das800_board das800_boards[] = {
[BOARD_DAS800] = {
.name = "das-800",
.ai_speed = 25000,
.ai_range = &range_bipolar5,
.resolution = 12,
},
[BOARD_CIODAS800] = {
.name = "cio-das800",
.ai_speed = 20000,
.ai_range = &range_bipolar5,
.resolution = 12,
},
[BOARD_DAS801] = {
.name = "das-801",
.ai_speed = 25000,
.ai_range = &range_das801_ai,
.resolution = 12,
},
[BOARD_CIODAS801] = {
.name = "cio-das801",
.ai_speed = 20000,
.ai_range = &range_cio_das801_ai,
.resolution = 12,
},
[BOARD_DAS802] = {
.name = "das-802",
.ai_speed = 25000,
.ai_range = &range_das802_ai,
.resolution = 12,
},
[BOARD_CIODAS802] = {
.name = "cio-das802",
.ai_speed = 20000,
.ai_range = &range_das802_ai,
.resolution = 12,
},
[BOARD_CIODAS80216] = {
.name = "cio-das802/16",
.ai_speed = 10000,
.ai_range = &range_das80216_ai,
.resolution = 16,
},
};
struct das800_private {
unsigned int count; /* number of data points left to be taken */
unsigned int divisor1; /* counter 1 value for timed conversions */
unsigned int divisor2; /* counter 2 value for timed conversions */
unsigned int do_bits; /* digital output bits */
bool forever; /* flag that we should take data forever */
};
static void das800_ind_write(struct comedi_device *dev,
unsigned val, unsigned reg)
{
/*
* Select dev->iobase + 2 to be desired register
* then write to that register.
*/
outb(reg, dev->iobase + DAS800_GAIN);
outb(val, dev->iobase + 2);
}
static unsigned das800_ind_read(struct comedi_device *dev, unsigned reg)
{
/*
* Select dev->iobase + 7 to be desired register
* then read from that register.
*/
outb(reg, dev->iobase + DAS800_GAIN);
return inb(dev->iobase + 7);
}
static void das800_enable(struct comedi_device *dev)
{
const struct das800_board *thisboard = comedi_board(dev);
struct das800_private *devpriv = dev->private;
unsigned long irq_flags;
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);
/* enable hardware triggering */
das800_ind_write(dev, CONV_HCEN, CONV_CONTROL);
/* enable card's interrupt */
das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits, CONTROL1);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
}
static void das800_disable(struct comedi_device *dev)
{
unsigned long irq_flags;
spin_lock_irqsave(&dev->spinlock, irq_flags);
/* disable hardware triggering of conversions */
das800_ind_write(dev, 0x0, CONV_CONTROL);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
}
static int das800_set_frequency(struct comedi_device *dev)
{
struct das800_private *devpriv = dev->private;
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;
}
static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct das800_private *devpriv = dev->private;
devpriv->forever = false;
devpriv->count = 0;
das800_disable(dev);
return 0;
}
static int das800_ai_do_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
const struct das800_board *thisboard = comedi_board(dev);
struct das800_private *devpriv = dev->private;
int err = 0;
/* Step 1 : check if triggers are trivially valid */
err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_FOLLOW);
err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
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->convert_src);
err |= cfc_check_trigger_is_unique(cmd->stop_src);
/* Step 2b : and mutually compatible */
if (err)
return 2;
/* Step 3: check if arguments are trivially valid */
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
if (cmd->convert_src == TRIG_TIMER)
err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
thisboard->ai_speed);
err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
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);
if (err)
return 3;
/* step 4: fix up any arguments */
if (cmd->convert_src == TRIG_TIMER) {
int 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) {
unsigned int chan = CR_CHAN(cmd->chanlist[0]);
unsigned int range = CR_RANGE(cmd->chanlist[0]);
unsigned int next;
int i;
for (i = 1; i < cmd->chanlist_len; i++) {
next = cmd->chanlist[i];
if (CR_CHAN(next) != (chan + i) % N_CHAN_AI) {
dev_err(dev->class_dev,
"chanlist must be consecutive, counting upwards\n");
err++;
}
if (CR_RANGE(next) != range) {
dev_err(dev->class_dev,
"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)
{
const struct das800_board *thisboard = comedi_board(dev);
struct das800_private *devpriv = dev->private;
struct comedi_async *async = s->async;
unsigned int gain = CR_RANGE(async->cmd.chanlist[0]);
unsigned int start_chan = CR_CHAN(async->cmd.chanlist[0]);
unsigned int end_chan = (start_chan + async->cmd.chanlist_len - 1) % 8;
unsigned int scan_chans = (end_chan << 3) | start_chan;
int conv_bits;
unsigned long irq_flags;
das800_disable(dev);
spin_lock_irqsave(&dev->spinlock, irq_flags);
/* set scan limits */
das800_ind_write(dev, scan_chans, SCAN_LIMITS);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
/* set gain */
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 = false;
break;
case TRIG_NONE:
devpriv->forever = true;
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 */
if (das800_set_frequency(dev) < 0) {
comedi_error(dev, "Error setting up counters");
return -1;
}
break;
case TRIG_EXT:
break;
default:
break;
}
spin_lock_irqsave(&dev->spinlock, irq_flags);
das800_ind_write(dev, conv_bits, CONV_CONTROL);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
async->events = 0;
das800_enable(dev);
return 0;
}
static unsigned int das800_ai_get_sample(struct comedi_device *dev)
{
unsigned int lsb = inb(dev->iobase + DAS800_LSB);
unsigned int msb = inb(dev->iobase + DAS800_MSB);
return (msb << 8) | lsb;
}
static irqreturn_t das800_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct das800_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_async *async = s ? s->async : NULL;
unsigned long irq_flags;
unsigned int status;
unsigned int val;
bool fifo_empty;
bool fifo_overflow;
int i;
status = inb(dev->iobase + DAS800_STATUS);
if (!(status & IRQ))
return IRQ_NONE;
if (!dev->attached)
return IRQ_HANDLED;
spin_lock_irqsave(&dev->spinlock, irq_flags);
status = das800_ind_read(dev, CONTROL1) & STATUS2_HCEN;
/*
* Don't release spinlock yet since we want to make sure
* no one else disables hardware conversions.
*/
/* if hardware conversions are not enabled, then quit */
if (status == 0) {
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
return IRQ_HANDLED;
}
for (i = 0; i < DAS802_16_HALF_FIFO_SZ; i++) {
val = das800_ai_get_sample(dev);
if (s->maxdata == 0x0fff) {
fifo_empty = !!(val & FIFO_EMPTY);
fifo_overflow = !!(val & FIFO_OVF);
} else {
/* cio-das802/16 has no fifo empty status bit */
fifo_empty = false;
fifo_overflow = !!(inb(dev->iobase + DAS800_GAIN) &
CIO_FFOV);
}
if (fifo_empty || fifo_overflow)
break;
if (s->maxdata == 0x0fff)
val >>= 4; /* 12-bit sample */
/* if there are more data points to collect */
if (devpriv->count > 0 || devpriv->forever) {
/* write data point to buffer */
cfc_write_to_buffer(s, val & s->maxdata);
devpriv->count--;
}
}
async->events |= COMEDI_CB_BLOCK;
if (fifo_overflow) {
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
das800_cancel(dev, s);
async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
comedi_event(dev, s);
async->events = 0;
return IRQ_HANDLED;
}
if (devpriv->count > 0 || devpriv->forever) {
/* Re-enable card's interrupt.
* We already have spinlock, so indirect addressing is safe */
das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits,
CONTROL1);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
} else {
/* otherwise, stop taking data */
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
das800_disable(dev);
async->events |= COMEDI_CB_EOA;
}
comedi_event(dev, s);
async->events = 0;
return IRQ_HANDLED;
}
static int das800_wait_for_conv(struct comedi_device *dev, int timeout)
{
int i;
for (i = 0; i < timeout; i++) {
if (!(inb(dev->iobase + DAS800_STATUS) & BUSY))
return 0;
}
return -ETIME;
}
static int das800_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct das800_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
unsigned long irq_flags;
unsigned int val;
int ret;
int i;
das800_disable(dev);
/* set multiplexer */
spin_lock_irqsave(&dev->spinlock, irq_flags);
das800_ind_write(dev, chan | devpriv->do_bits, CONTROL1);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
/* set gain / range */
if (s->maxdata == 0x0fff && range)
range += 0x7;
range &= 0xf;
outb(range, dev->iobase + DAS800_GAIN);
udelay(5);
for (i = 0; i < insn->n; i++) {
/* trigger conversion */
outb_p(0, dev->iobase + DAS800_MSB);
ret = das800_wait_for_conv(dev, 1000);
if (ret)
return ret;
val = das800_ai_get_sample(dev);
if (s->maxdata == 0x0fff)
val >>= 4; /* 12-bit sample */
data[i] = val & s->maxdata;
}
return insn->n;
}
static int das800_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
data[1] = (inb(dev->iobase + DAS800_STATUS) >> 4) & 0x7;
return insn->n;
}
static int das800_do_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct das800_private *devpriv = dev->private;
unsigned int mask = data[0];
unsigned int bits = data[1];
unsigned long irq_flags;
if (mask) {
s->state &= ~mask;
s->state |= (bits & mask);
devpriv->do_bits = s->state << 4;
spin_lock_irqsave(&dev->spinlock, irq_flags);
das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits,
CONTROL1);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
}
data[1] = s->state;
return insn->n;
}
static int das800_probe(struct comedi_device *dev)
{
const struct das800_board *thisboard = comedi_board(dev);
int board = thisboard ? thisboard - das800_boards : -EINVAL;
int id_bits;
unsigned long irq_flags;
spin_lock_irqsave(&dev->spinlock, irq_flags);
id_bits = das800_ind_read(dev, ID) & 0x3;
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
switch (id_bits) {
case 0x0:
if (board == BOARD_DAS800 || board == BOARD_CIODAS800)
break;
dev_dbg(dev->class_dev, "Board model (probed): DAS-800\n");
board = BOARD_DAS800;
break;
case 0x2:
if (board == BOARD_DAS801 || board == BOARD_CIODAS801)
break;
dev_dbg(dev->class_dev, "Board model (probed): DAS-801\n");
board = BOARD_DAS801;
break;
case 0x3:
if (board == BOARD_DAS802 || board == BOARD_CIODAS802 ||
board == BOARD_CIODAS80216)
break;
dev_dbg(dev->class_dev, "Board model (probed): DAS-802\n");
board = BOARD_DAS802;
break;
default:
dev_dbg(dev->class_dev, "Board model: 0x%x (unknown)\n",
id_bits);
board = -EINVAL;
break;
}
return board;
}
static int das800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct das800_board *thisboard = comedi_board(dev);
struct das800_private *devpriv;
struct comedi_subdevice *s;
unsigned int irq = it->options[1];
unsigned long irq_flags;
int board;
int ret;
devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
if (!devpriv)
return -ENOMEM;
dev->private = devpriv;
ret = comedi_request_region(dev, it->options[0], DAS800_SIZE);
if (ret)
return ret;
board = das800_probe(dev);
if (board < 0) {
dev_dbg(dev->class_dev, "unable to determine board type\n");
return -ENODEV;
}
dev->board_ptr = das800_boards + board;
thisboard = comedi_board(dev);
dev->board_name = thisboard->name;
if (irq > 1 && irq <= 7) {
ret = request_irq(irq, das800_interrupt, 0, dev->board_name,
dev);
if (ret == 0)
dev->irq = irq;
}
ret = comedi_alloc_subdevices(dev, 3);
if (ret)
return ret;
/* Analog Input subdevice */
s = &dev->subdevices[0];
dev->read_subdev = s;
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_GROUND;
s->n_chan = 8;
s->maxdata = (1 << thisboard->resolution) - 1;
s->range_table = thisboard->ai_range;
s->insn_read = das800_ai_insn_read;
if (dev->irq) {
s->subdev_flags |= SDF_CMD_READ;
s->len_chanlist = 8;
s->do_cmdtest = das800_ai_do_cmdtest;
s->do_cmd = das800_ai_do_cmd;
s->cancel = das800_cancel;
}
/* Digital Input subdevice */
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_insn_bits;
/* Digital Output subdevice */
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_insn_bits;
das800_disable(dev);
/* initialize digital out channels */
spin_lock_irqsave(&dev->spinlock, irq_flags);
das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits, CONTROL1);
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
return 0;
};
static struct comedi_driver driver_das800 = {
.driver_name = "das800",
.module = THIS_MODULE,
.attach = das800_attach,
.detach = comedi_legacy_detach,
.num_names = ARRAY_SIZE(das800_boards),
.board_name = &das800_boards[0].name,
.offset = sizeof(struct das800_board),
};
module_comedi_driver(driver_das800);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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