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r: 141396
b: refs/heads/master
c: 90a5038
h: refs/heads/master
v: v3
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Stanislaw Raczynski authored and Greg Kroah-Hartman committed Apr 3, 2009
1 parent d58089c commit 49d987a
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---
refs/heads/master: 2f82613d3a7ef447be4ce656f757fc1ea101a4f1
refs/heads/master: 90a5038d91db44a8a224936651fc33325989ad43
384 changes: 384 additions & 0 deletions trunk/drivers/staging/comedi/drivers/mpc624.c
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/*
comedi/drivers/mpc624.c
Hardware driver for a Micro/sys inc. MPC-624 PC/104 board
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: mpc624
Description: Micro/sys MPC-624 PC/104 board
Devices: [Micro/sys] MPC-624 (mpc624)
Author: Stanislaw Raczynski <sraczynski@op.pl>
Updated: Thu, 15 Sep 2005 12:01:18 +0200
Status: working
The Micro/sys MPC-624 board is based on the LTC2440 24-bit sigma-delta
ADC chip.
Subdevices supported by the driver:
- Analog In: supported
- Digital I/O: not supported
- LEDs: not supported
- EEPROM: not supported
Configuration Options:
[0] - I/O base address
[1] - convertion rate
Convertion rate RMS noise Effective Number Of Bits
0 3.52kHz 23uV 17
1 1.76kHz 3.5uV 20
2 880Hz 2uV 21.3
3 440Hz 1.4uV 21.8
4 220Hz 1uV 22.4
5 110Hz 750uV 22.9
6 55Hz 510nV 23.4
7 27.5Hz 375nV 24
8 13.75Hz 250nV 24.4
9 6.875Hz 200nV 24.6
[2] - voltage range
0 -1.01V .. +1.01V
1 -10.1V .. +10.1V
*/

#include "../comedidev.h"

#include <linux/ioport.h>
#include <linux/delay.h>

// Consecutive I/O port addresses
#define MPC624_SIZE 16

// Offsets of different ports
#define MPC624_MASTER_CONTROL 0 // not used
#define MPC624_GNMUXCH 1 // Gain, Mux, Channel of ADC
#define MPC624_ADC 2 // read/write to/from ADC
#define MPC624_EE 3 // read/write to/from serial EEPROM via I2C
#define MPC624_LEDS 4 // write to LEDs
#define MPC624_DIO 5 // read/write to/from digital I/O ports
#define MPC624_IRQ_MASK 6 // IRQ masking enable/disable

// Register bits' names
#define MPC624_ADBUSY (1<<5)
#define MPC624_ADSDO (1<<4)
#define MPC624_ADFO (1<<3)
#define MPC624_ADCS (1<<2)
#define MPC624_ADSCK (1<<1)
#define MPC624_ADSDI (1<<0)

// SDI Speed/Resolution Programming bits
#define MPC624_OSR4 (1<<31)
#define MPC624_OSR3 (1<<30)
#define MPC624_OSR2 (1<<29)
#define MPC624_OSR1 (1<<28)
#define MPC624_OSR0 (1<<27)

// 32-bit output value bits' names
#define MPC624_EOC_BIT (1<<31)
#define MPC624_DMY_BIT (1<<30)
#define MPC624_SGN_BIT (1<<29)

// Convertion speeds
/* OSR4 OSR3 OSR2 OSR1 OSR0 Convertion rate RMS noise ENOB^
* X 0 0 0 1 3.52kHz 23uV 17
* X 0 0 1 0 1.76kHz 3.5uV 20
* X 0 0 1 1 880Hz 2uV 21.3
* X 0 1 0 0 440Hz 1.4uV 21.8
* X 0 1 0 1 220Hz 1uV 22.4
* X 0 1 1 0 110Hz 750uV 22.9
* X 0 1 1 1 55Hz 510nV 23.4
* X 1 0 0 0 27.5Hz 375nV 24
* X 1 0 0 1 13.75Hz 250nV 24.4
* X 1 1 1 1 6.875Hz 200nV 24.6
*
* ^ - Effective Number Of Bits
*/

#define MPC624_SPEED_3_52_kHz (MPC624_OSR4 | MPC624_OSR0)
#define MPC624_SPEED_1_76_kHz (MPC624_OSR4 | MPC624_OSR1 )
#define MPC624_SPEED_880_Hz (MPC624_OSR4 | MPC624_OSR1 | MPC624_OSR0)
#define MPC624_SPEED_440_Hz (MPC624_OSR4 | MPC624_OSR2 )
#define MPC624_SPEED_220_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR0)
#define MPC624_SPEED_110_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1 )
#define MPC624_SPEED_55_Hz (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
#define MPC624_SPEED_27_5_Hz (MPC624_OSR4 | MPC624_OSR3 )
#define MPC624_SPEED_13_75_Hz (MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR0)
#define MPC624_SPEED_6_875_Hz (MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
//----------------------------------------------------------------------------
typedef struct {
unsigned long int ulConvertionRate; // set by mpc624_attach() from driver's parameters
} skel_private;

#define devpriv ((skel_private *)dev->private)
//----------------------------------------------------------------------------
static const comedi_lrange range_mpc624_bipolar1 = {
1,
{
// BIP_RANGE(1.01) // this is correct,
// but my MPC-624 actually seems to have a range of 2.02
BIP_RANGE(2.02)
}
};
static const comedi_lrange range_mpc624_bipolar10 = {
1,
{
// BIP_RANGE(10.1) // this is correct,
// but my MPC-624 actually seems to have a range of 20.2
BIP_RANGE(20.2)
}
};

//----------------------------------------------------------------------------
static int mpc624_attach(comedi_device * dev, comedi_devconfig * it);
static int mpc624_detach(comedi_device * dev);
//----------------------------------------------------------------------------
static comedi_driver driver_mpc624 = {
driver_name:"mpc624",
module:THIS_MODULE,
attach:mpc624_attach,
detach:mpc624_detach
};

//----------------------------------------------------------------------------
static int mpc624_ai_rinsn(comedi_device * dev, comedi_subdevice * s,
comedi_insn * insn, lsampl_t * data);
//----------------------------------------------------------------------------
static int mpc624_attach(comedi_device * dev, comedi_devconfig * it)
{
comedi_subdevice *s;
unsigned long iobase;

iobase = it->options[0];
rt_printk("comedi%d: mpc624 [0x%04lx, ", dev->minor, iobase);
if (request_region(iobase, MPC624_SIZE, "mpc624") == NULL) {
rt_printk("I/O port(s) in use\n");
return -EIO;
}

dev->iobase = iobase;
dev->board_name = "mpc624";

// Private structure initialization
if (alloc_private(dev, sizeof(skel_private)) < 0)
return -ENOMEM;

switch (it->options[1]) {
case 0:
devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
rt_printk("3.52 kHz, ");
break;
case 1:
devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz;
rt_printk("1.76 kHz, ");
break;
case 2:
devpriv->ulConvertionRate = MPC624_SPEED_880_Hz;
rt_printk("880 Hz, ");
break;
case 3:
devpriv->ulConvertionRate = MPC624_SPEED_440_Hz;
rt_printk("440 Hz, ");
break;
case 4:
devpriv->ulConvertionRate = MPC624_SPEED_220_Hz;
rt_printk("220 Hz, ");
break;
case 5:
devpriv->ulConvertionRate = MPC624_SPEED_110_Hz;
rt_printk("110 Hz, ");
break;
case 6:
devpriv->ulConvertionRate = MPC624_SPEED_55_Hz;
rt_printk("55 Hz, ");
break;
case 7:
devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz;
rt_printk("27.5 Hz, ");
break;
case 8:
devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz;
rt_printk("13.75 Hz, ");
break;
case 9:
devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz;
rt_printk("6.875 Hz, ");
break;
default:
rt_printk
("illegal convertion rate setting! Valid numbers are 0..9. Using 9 => 6.875 Hz, ");
devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
}

// Subdevices structures
if (alloc_subdevices(dev, 1) < 0)
return -ENOMEM;

s = dev->subdevices + 0;
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_DIFF;
s->n_chan = 8;
switch (it->options[1]) {
default:
s->maxdata = 0x3FFFFFFF;
rt_printk("30 bit, ");
}

switch (it->options[1]) {
case 0:
s->range_table = &range_mpc624_bipolar1;
rt_printk("1.01V]: ");
break;
default:
s->range_table = &range_mpc624_bipolar10;
rt_printk("10.1V]: ");
}
s->len_chanlist = 1;
s->insn_read = mpc624_ai_rinsn;

rt_printk("attached\n");

return 1;
}

static int mpc624_detach(comedi_device * dev)
{
rt_printk("comedi%d: mpc624: remove\n", dev->minor);

if (dev->iobase)
release_region(dev->iobase, MPC624_SIZE);

return 0;
}

// Timeout 200ms
#define TIMEOUT 200

static int mpc624_ai_rinsn(comedi_device * dev, comedi_subdevice * s,
comedi_insn * insn, lsampl_t * data)
{
int n, i;
unsigned long int data_in, data_out;
unsigned char ucPort;

// WARNING: We always write 0 to GNSWA bit, so the channel range is +-/10.1Vdc
outb(insn->chanspec, dev->iobase + MPC624_GNMUXCH);
// rt_printk("Channel %d: \n", insn->chanspec);
if (!insn->n) {
rt_printk("MPC624: Warning, no data to aquire\n");
return 0;
}

for (n = 0; n < insn->n; n++) {
// Trigger the convertion
outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
comedi_udelay(1);
outb(MPC624_ADCS | MPC624_ADSCK, dev->iobase + MPC624_ADC);
comedi_udelay(1);
outb(0, dev->iobase + MPC624_ADC);
comedi_udelay(1);

// Wait for the convertion to end
for (i = 0; i < TIMEOUT; i++) {
ucPort = inb(dev->iobase + MPC624_ADC);
if (ucPort & MPC624_ADBUSY)
comedi_udelay(1000);
else
break;
}
if (i == TIMEOUT) {
rt_printk("MPC624: timeout (%dms)\n", TIMEOUT);
data[n] = 0;
return -ETIMEDOUT;
}
// Start reading data
data_in = 0;
data_out = devpriv->ulConvertionRate;
comedi_udelay(1);
for (i = 0; i < 32; i++) {
// Set the clock low
outb(0, dev->iobase + MPC624_ADC);
comedi_udelay(1);

if (data_out & (1 << 31)) // the next bit is a 1
{
// Set the ADSDI line (send to MPC624)
outb(MPC624_ADSDI, dev->iobase + MPC624_ADC);
comedi_udelay(1);
// Set the clock high
outb(MPC624_ADSCK | MPC624_ADSDI,
dev->iobase + MPC624_ADC);
} else // the next bit is a 0
{
// Set the ADSDI line (send to MPC624)
outb(0, dev->iobase + MPC624_ADC);
comedi_udelay(1);
// Set the clock high
outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
}
// Read ADSDO on high clock (receive from MPC624)
comedi_udelay(1);
data_in <<= 1;
data_in |=
(inb(dev->iobase +
MPC624_ADC) & MPC624_ADSDO) >> 4;
comedi_udelay(1);

data_out <<= 1;
}

// Received 32-bit long value consist of:
// 31: EOC (End Of Transmission) bit - should be 0
// 30: DMY (Dummy) bit - should be 0
// 29: SIG (Sign) bit - 1 if the voltage is positive, 0 if negative
// 28: MSB (Most Significant Bit) - the first bit of convertion result
// ....
// 05: LSB (Least Significant Bit) - the last bit of convertion result
// 04: sub-LSB - sub-LSBs are basically noise, but when
// 03: sub-LSB averaged properly, they can increase convertion
// 02: sub-LSB precision up to 29 bits; they can be discarded
// 01: sub-LSB without loss of resolution.
// 00: sub-LSB

if (data_in & MPC624_EOC_BIT)
rt_printk("MPC624: EOC bit is set (data_in=%lu)!",
data_in);
if (data_in & MPC624_DMY_BIT)
rt_printk("MPC624: DMY bit is set (data_in=%lu)!",
data_in);
if (data_in & MPC624_SGN_BIT) // check the sign bit
{ // The voltage is positive
data_in &= 0x3FFFFFFF; // EOC and DMY should be 0, but we will mask them out just to be sure
data[n] = data_in; // comedi operates on unsigned numbers, so we don't clear the SGN bit
// SGN bit is still set! It's correct, since we're converting to unsigned.
} else { // The voltage is negative
// data_in contains a number in 30-bit two's complement code and we must deal with it
data_in |= MPC624_SGN_BIT;
data_in = ~data_in;
data_in += 1;
data_in &= ~(MPC624_EOC_BIT | MPC624_DMY_BIT);
// clear EOC and DMY bits
data_in = 0x20000000 - data_in;
data[n] = data_in;
}
}

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

COMEDI_INITCLEANUP(driver_mpc624);

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