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r: 141378
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c: 27b3f92
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v: v3
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Jeremy Theler authored and Greg Kroah-Hartman committed Apr 3, 2009
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refs/heads/master: 8cb9b9fb975476b6b3128f2d192d4e2ddf94c5a0
refs/heads/master: 27b3f921f1ede6e4b1d18a2e25898e7aa2fe4db6
394 changes: 394 additions & 0 deletions trunk/drivers/staging/comedi/drivers/adq12b.c
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/*
comedi/drivers/adq12b.c
driver for MicroAxial ADQ12-B data acquisition and control card
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: adq12b
Description: driver for MicroAxial ADQ12-B data acquisition and control card
Devices: [MicroAxial] ADQ12-B (adq12b)
Author: jeremy theler <thelerg@ib.cnea.gov.ar>
Updated: Thu, 21 Feb 2008 02:56:27 -0300
Status: works
Driver for the acquisition card ADQ12-B (without any add-on).
- Analog input is subdevice 0 (16 channels single-ended or 8 differential)
- Digital input is subdevice 1 (5 channels)
- Digital output is subdevice 1 (8 channels)
- The PACER is not supported in this version
If you do not specify any options, they will default to
# comedi_config /dev/comedi0 adq12b 0x300,0,0
option 1: I/O base address. The following table is provided as a help
of the hardware jumpers.
address jumper JADR
0x300 1 (factory default)
0x320 2
0x340 3
0x360 4
0x380 5
0x3A0 6
option 2: unipolar/bipolar ADC selection: 0 -> bipolar, 1 -> unipolar
selection comedi_config option JUB
bipolar 0 2-3 (factory default)
unipolar 1 1-2
option 3: single-ended/differential AI selection: 0 -> SE, 1 -> differential
selection comedi_config option JCHA JCHB
single-ended 0 1-2 1-2 (factory default)
differential 1 2-3 2-3
written by jeremy theler <thelerg@ib.cnea.gov.ar>
instituto balseiro
comision nacional de energia atomica
universidad nacional de cuyo
argentina
21-feb-2008
+ changed supported devices string (missused the [] and ())
13-oct-2007
+ first try
*/

#include "../comedidev.h"

// address scheme (page 2.17 of the manual)
#define ADQ12B_SIZE 16

#define ADQ12B_CTREG 0x00
#define ADQ12B_STINR 0x00
#define ADQ12B_OUTBR 0x04
#define ADQ12B_ADLOW 0x08
#define ADQ12B_ADHIG 0x09
#define ADQ12B_CONT0 0x0c
#define ADQ12B_CONT1 0x0d
#define ADQ12B_CONT2 0x0e
#define ADQ12B_COWORD 0x0f

// mask of the bit at STINR to check end of conversion
#define ADQ12B_EOC 0x20

#define TIMEOUT 20

// available ranges through the PGA gains
static const comedi_lrange range_adq12b_ai_bipolar = { 4, {
BIP_RANGE( 5 ),
BIP_RANGE( 2 ),
BIP_RANGE( 1 ),
BIP_RANGE( 0.5 )
}};

static const comedi_lrange range_adq12b_ai_unipolar = { 4, {
UNI_RANGE( 5 ),
UNI_RANGE( 2 ),
UNI_RANGE( 1 ),
UNI_RANGE( 0.5 )
}};



typedef struct adq12b_board_struct{
const char *name;
int ai_se_chans;
int ai_diff_chans;
int ai_bits;
int di_chans;
int do_chans;
}adq12b_board;

static const adq12b_board adq12b_boards[] = {
{
name: "adq12b",
ai_se_chans: 16,
ai_diff_chans: 8,
ai_bits: 12,
di_chans: 5,
do_chans: 8
}
// potentially, more adq-based deviced will be added
/*,
name: "adq12b",
ai_chans: 16, // this is just for reference, hardcoded again later
ai_bits: 12,
di_chans: 8,
do_chans: 5
}*/
};

#define thisboard ((const adq12b_board *)dev->board_ptr)

typedef struct{
int unipolar; /* option 2 of comedi_config (1 is iobase) */
int differential; /* option 3 of comedi_config */
int last_channel;
int last_range;
lsampl_t digital_state;
}adq12b_private;

#define devpriv ((adq12b_private *)dev->private)

/*
* The 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 adq12b_attach(comedi_device *dev,comedi_devconfig *it);
static int adq12b_detach(comedi_device *dev);
static comedi_driver driver_adq12b={
driver_name: "adq12b",
module: THIS_MODULE,
attach: adq12b_attach,
detach: adq12b_detach,
board_name: &adq12b_boards[0].name,
offset: sizeof(adq12b_board),
num_names: sizeof(adq12b_boards) / sizeof(adq12b_board),
};

static int adq12b_ai_rinsn(comedi_device *dev,comedi_subdevice *s,comedi_insn *insn,lsampl_t *data);
static int adq12b_di_insn_bits(comedi_device *dev,comedi_subdevice *s, comedi_insn *insn,lsampl_t *data);
static int adq12b_do_insn_bits(comedi_device *dev,comedi_subdevice *s, comedi_insn *insn,lsampl_t *data);

/*
* 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 adq12b_attach(comedi_device *dev,comedi_devconfig *it)
{
comedi_subdevice *s;
unsigned long iobase;
int unipolar, differential;

iobase = it->options[0];
unipolar = it->options[1];
differential = it->options[2];

printk("comedi%d: adq12b called with options base=0x%03lx, %s and %s\n",dev->minor, iobase, (unipolar==1)?"unipolar":"bipolar", (differential==1)?"differential":"single-ended");

/* if no address was specified, try the default 0x300 */
if (iobase == 0) {
printk("comedi%d: adq12b warning: I/O base address not specified. Trying the default 0x300.\n", dev->minor);
iobase = 0x300;
}

printk("comedi%d: adq12b: 0x%04lx ", dev->minor, iobase);
if (!request_region(iobase, ADQ12B_SIZE, "adq12b")) {
printk("I/O port conflict\n");
return -EIO;
}
dev->iobase = iobase;

/*
* 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(adq12b_private)) < 0)
return -ENOMEM;

/* fill in devpriv structure */
devpriv->unipolar = unipolar;
devpriv->differential = differential;
devpriv->digital_state = 0;
/* initialize channel and range to -1 so we make sure we always write
at least once to the CTREG in the instruction */
devpriv->last_channel = -1;
devpriv->last_range = -1;


/*
* 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;
/* analog input subdevice */
s->type = COMEDI_SUBD_AI;
if (differential) {
s->subdev_flags = SDF_READABLE|SDF_GROUND|SDF_DIFF;
s->n_chan = thisboard->ai_diff_chans;
} else {
s->subdev_flags = SDF_READABLE|SDF_GROUND;
s->n_chan = thisboard->ai_se_chans;
}

if (unipolar) {
s->range_table = &range_adq12b_ai_unipolar;
} else {
s->range_table = &range_adq12b_ai_bipolar;
}

s->maxdata = (1 << thisboard->ai_bits)-1;


s->len_chanlist = 4; /* This is the maximum chanlist length that
the board can handle */
s->insn_read = adq12b_ai_rinsn;


s = dev->subdevices+1;
/* digital input subdevice */
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE;
s->n_chan=thisboard->di_chans;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = adq12b_di_insn_bits;

s = dev->subdevices+2;
/* digital output subdevice */
s->type = COMEDI_SUBD_DO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = thisboard->do_chans;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = adq12b_do_insn_bits;


printk("attached\n");

return 0;
}


/*
* _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 adq12b_detach(comedi_device *dev)
{
if (dev->iobase)
release_region(dev->iobase, ADQ12B_SIZE);

kfree(devpriv);

printk("comedi%d: adq12b: removed\n",dev->minor);

return 0;
}

/*
* "instructions" read/write data in "one-shot" or "software-triggered"
* mode.
*/

static int adq12b_ai_rinsn(comedi_device *dev,comedi_subdevice *s,comedi_insn *insn,lsampl_t *data)
{
int n, i;
int range, channel;
unsigned char hi, lo, status;

/* change channel and range only if it is different from the previous */
range = CR_RANGE(insn->chanspec);
channel = CR_CHAN(insn->chanspec);
if (channel != devpriv->last_channel || range != devpriv->last_range) {
outb((range << 4) | channel, dev->iobase + ADQ12B_CTREG);
comedi_udelay(50); /* wait for the mux to settle */
}

/* trigger conversion */
status = inb(dev->iobase + ADQ12B_ADLOW);

/* convert n samples */
for(n=0; n < insn->n; n++){

/* wait for end of convertion */
i = 0;
do {
// comedi_udelay(1);
status = inb(dev->iobase + ADQ12B_STINR);
status = status & ADQ12B_EOC;
} while (status == 0 && ++i < TIMEOUT);
// } while (++i < 10);

/* read data */
hi = inb(dev->iobase + ADQ12B_ADHIG);
lo = inb(dev->iobase + ADQ12B_ADLOW);

//rt_printk("debug: chan=%d range=%d status=%d hi=%d lo=%d\n", channel, range, status, hi, lo);
data[n] = (hi << 8) | lo;

}

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


static int adq12b_di_insn_bits(comedi_device *dev,comedi_subdevice *s, comedi_insn *insn,lsampl_t *data)
{

/* only bits 0-4 have information about digital inputs */
data[1] = (inb(dev->iobase+ADQ12B_STINR) & (0x1f));

return 2;
}


static int adq12b_do_insn_bits(comedi_device *dev,comedi_subdevice *s, comedi_insn *insn,lsampl_t *data)
{
int channel;

for (channel = 0; channel < 8; channel++)
if (((data[0]>>channel) & 0x01) != 0)
outb((((data[1]>>channel)&0x01)<<3) | channel, dev->iobase + ADQ12B_OUTBR);

/* store information to retrieve when asked for reading */
if (data[0]) {
devpriv->digital_state &= ~data[0];
devpriv->digital_state |= (data[0]&data[1]);
}

data[1] = devpriv->digital_state;

return 2;
}


/*
* A convenient macro that defines init_module() and cleanup_module(),
* as necessary.
*/
COMEDI_INITCLEANUP(driver_adq12b);

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