// SPDX-License-Identifier: GPL-2.0+
/*
* comedi/drivers/das08.c
* comedi module for common DAS08 support (used by ISA/PCI/PCMCIA drivers)
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2000 David A. Schleef <[email protected]>
* Copyright (C) 2001,2002,2003 Frank Mori Hess <[email protected]>
* Copyright (C) 2004 Salvador E. Tropea <[email protected]> <[email protected]>
*/
#include <linux/module.h>
#include <linux/comedi/comedidev.h>
#include <linux/comedi/comedi_8255.h>
#include <linux/comedi/comedi_8254.h>
#include "das08.h"
/*
* Data format of DAS08_AI_LSB_REG and DAS08_AI_MSB_REG depends on
* 'ai_encoding' member of board structure:
*
* das08_encode12 : DATA[11..4] = MSB[7..0], DATA[3..0] = LSB[7..4].
* das08_pcm_encode12 : DATA[11..8] = MSB[3..0], DATA[7..9] = LSB[7..0].
* das08_encode16 : SIGN = MSB[7], MAGNITUDE[14..8] = MSB[6..0],
* MAGNITUDE[7..0] = LSB[7..0].
* SIGN==0 for negative input, SIGN==1 for positive input.
* Note: when read a second time after conversion
* complete, MSB[7] is an "over-range" bit.
*/
#define DAS08_AI_LSB_REG 0x00 /* (R) AI least significant bits */
#define DAS08_AI_MSB_REG 0x01 /* (R) AI most significant bits */
#define DAS08_AI_TRIG_REG 0x01 /* (W) AI software trigger */
#define DAS08_STATUS_REG 0x02 /* (R) status */
#define DAS08_STATUS_AI_BUSY BIT(7) /* AI conversion in progress */
/*
* The IRQ status bit is set to 1 by a rising edge on the external interrupt
* input (which may be jumpered to the pacer output). It is cleared by
* setting the INTE control bit to 0. Not present on "JR" boards.
*/
#define DAS08_STATUS_IRQ BIT(3) /* latched interrupt input */
/* digital inputs (not "JR" boards) */
#define DAS08_STATUS_DI(x) (((x) & 0x70) >> 4)
#define DAS08_CONTROL_REG 0x02 /* (W) control */
/*
* Note: The AI multiplexor channel can also be read from status register using
* the same mask.
*/
#define DAS08_CONTROL_MUX_MASK 0x7 /* multiplexor channel mask */
#define DAS08_CONTROL_MUX(x) ((x) & DAS08_CONTROL_MUX_MASK) /* mux channel */
#define DAS08_CONTROL_INTE BIT(3) /* interrupt enable (not "JR" boards) */
#define DAS08_CONTROL_DO_MASK 0xf0 /* digital outputs mask (not "JR") */
/* digital outputs (not "JR" boards) */
#define DAS08_CONTROL_DO(x) (((x) << 4) & DAS08_CONTROL_DO_MASK)
/*
* (R/W) programmable AI gain ("PGx" and "AOx" boards):
* + bits 3..0 (R/W) show/set the gain for the current AI mux channel
* + bits 6..4 (R) show the current AI mux channel
* + bit 7 (R) not unused
*/
#define DAS08_GAIN_REG 0x03
#define DAS08JR_DI_REG 0x03 /* (R) digital inputs ("JR" boards) */
#define DAS08JR_DO_REG 0x03 /* (W) digital outputs ("JR" boards) */
/* (W) analog output l.s.b. registers for 2 channels ("JR" boards) */
#define DAS08JR_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
/* (W) analog output m.s.b. registers for 2 channels ("JR" boards) */
#define DAS08JR_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
/*
* (R) update analog outputs ("JR" boards set for simultaneous output)
* (same register as digital inputs)
*/
#define DAS08JR_AO_UPDATE_REG 0x03
/* (W) analog output l.s.b. registers for 2 channels ("AOx" boards) */
#define DAS08AOX_AO_LSB_REG(x) ((x) ? 0x0a : 0x08)
/* (W) analog output m.s.b. registers for 2 channels ("AOx" boards) */
#define DAS08AOX_AO_MSB_REG(x) ((x) ? 0x0b : 0x09)
/*
* (R) update analog outputs ("AOx" boards set for simultaneous output)
* (any of the analog output registers could be used for this)
*/
#define DAS08AOX_AO_UPDATE_REG 0x08
/* gainlist same as _pgx_ below */
static const struct comedi_lrange das08_pgl_ai_range = {
9, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(2.5),
BIP_RANGE(1.25),
BIP_RANGE(0.625),
UNI_RANGE(10),
UNI_RANGE(5),
UNI_RANGE(2.5),
UNI_RANGE(1.25)
}
};
static const struct comedi_lrange das08_pgh_ai_range = {
12, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(1),
BIP_RANGE(0.5),
BIP_RANGE(0.1),
BIP_RANGE(0.05),
BIP_RANGE(0.01),
BIP_RANGE(0.005),
UNI_RANGE(10),
UNI_RANGE(1),
UNI_RANGE(0.1),
UNI_RANGE(0.01)
}
};
static const struct comedi_lrange das08_pgm_ai_range = {
9, {
BIP_RANGE(10),
BIP_RANGE(5),
BIP_RANGE(0.5),
BIP_RANGE(0.05),
BIP_RANGE(0.01),
UNI_RANGE(10),
UNI_RANGE(1),
UNI_RANGE(0.1),
UNI_RANGE(0.01)
}
};
static const struct comedi_lrange *const das08_ai_lranges[] = {
[das08_pg_none] = &range_unknown,
[das08_bipolar5] = &range_bipolar5,
[das08_pgh] = &das08_pgh_ai_range,
[das08_pgl] = &das08_pgl_ai_range,
[das08_pgm] = &das08_pgm_ai_range,
};
static const int das08_pgh_ai_gainlist[] = {
8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
};
static const int das08_pgl_ai_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
static const int das08_pgm_ai_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
static const int *const das08_ai_gainlists[] = {
[das08_pg_none] = NULL,
[das08_bipolar5] = NULL,
[das08_pgh] = das08_pgh_ai_gainlist,
[das08_pgl] = das08_pgl_ai_gainlist,
[das08_pgm] = das08_pgm_ai_gainlist,
};
static int das08_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + DAS08_STATUS_REG);
if ((status & DAS08_STATUS_AI_BUSY) == 0)
return 0;
return -EBUSY;
}
static int das08_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
const struct das08_board_struct *board = dev->board_ptr;
struct das08_private_struct *devpriv = dev->private;
int n;
int chan;
int range;
int lsb, msb;
int ret;
chan = CR_CHAN(insn->chanspec);
/* clear crap */
inb(dev->iobase + DAS08_AI_LSB_REG);
inb(dev->iobase + DAS08_AI_MSB_REG);
/* set multiplexer */
/* lock to prevent race with digital output */
spin_lock(&dev->spinlock);
devpriv->do_mux_bits &= ~DAS08_CONTROL_MUX_MASK;
devpriv->do_mux_bits |= DAS08_CONTROL_MUX(chan);
outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
spin_unlock(&dev->spinlock);
if (devpriv->pg_gainlist) {
/* set gain/range */
range = CR_RANGE(insn->chanspec);
outb(devpriv->pg_gainlist[range],
dev->iobase + DAS08_GAIN_REG);
}
for (n = 0; n < insn->n; n++) {
/* clear over-range bits for 16-bit boards */
if (board->ai_nbits == 16)
if (inb(dev->iobase + DAS08_AI_MSB_REG) & 0x80)
dev_info(dev->class_dev, "over-range\n");
/* trigger conversion */
outb_p(0, dev->iobase + DAS08_AI_TRIG_REG);
ret = comedi_timeout(dev, s, insn, das08_ai_eoc, 0);
if (ret)
return ret;
msb = inb(dev->iobase + DAS08_AI_MSB_REG);
lsb = inb(dev->iobase + DAS08_AI_LSB_REG);
if (board->ai_encoding == das08_encode12) {
data[n] = (lsb >> 4) | (msb << 4);
} else if (board->ai_encoding == das08_pcm_encode12) {
data[n] = (msb << 8) + lsb;
} else if (board->ai_encoding == das08_encode16) {
/*
* "JR" 16-bit boards are sign-magnitude.
*
* XXX The manual seems to imply that 0 is full-scale
* negative and 65535 is full-scale positive, but the
* original COMEDI patch to add support for the
* DAS08/JR/16 and DAS08/JR/16-AO boards have it
* encoded as sign-magnitude. Assume the original
* COMEDI code is correct for now.
*/
unsigned int magnitude = lsb | ((msb & 0x7f) << 8);
/*
* MSB bit 7 is 0 for negative, 1 for positive voltage.
* COMEDI 16-bit bipolar data value for 0V is 0x8000.
*/
if (msb & 0x80)
data[n] = BIT(15) + magnitude;
else
data[n] = BIT(15) - magnitude;
} else {
dev_err(dev->class_dev, "bug! unknown ai encoding\n");
return -1;
}
}
return n;
}
static int das08_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
data[0] = 0;
data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
return insn->n;
}
static int das08_do_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct das08_private_struct *devpriv = dev->private;
if (comedi_dio_update_state(s, data)) {
/* prevent race with setting of analog input mux */
spin_lock(&dev->spinlock);
devpriv->do_mux_bits &= ~DAS08_CONTROL_DO_MASK;
devpriv->do_mux_bits |= DAS08_CONTROL_DO(s->state);
outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
spin_unlock(&dev->spinlock);
}
data[1] = s->state;
return insn->n;
}
static int das08jr_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
data[0] = 0;
data[1] = inb(dev->iobase + DAS08JR_DI_REG);
return insn->n;
}
static int das08jr_do_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
if (comedi_dio_update_state(s, data))
outb(s->state, dev->iobase + DAS08JR_DO_REG);
data[1] = s->state;
return insn->n;
}
static void das08_ao_set_data(struct comedi_device *dev,
unsigned int chan, unsigned int data)
{
const struct das08_board_struct *board = dev->board_ptr;
unsigned char lsb;
unsigned char msb;
lsb = data & 0xff;
msb = (data >> 8) & 0xff;
if (board->is_jr) {
outb(lsb, dev->iobase + DAS08JR_AO_LSB_REG(chan));
outb(msb, dev->iobase + DAS08JR_AO_MSB_REG(chan));
/* load DACs */
inb(dev->iobase + DAS08JR_AO_UPDATE_REG);
} else {
outb(lsb, dev->iobase + DAS08AOX_AO_LSB_REG(chan));
outb(msb, dev->iobase + DAS08AOX_AO_MSB_REG(chan));
/* load DACs */
inb(dev->iobase + DAS08AOX_AO_UPDATE_REG);
}
}
static int das08_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int val = s->readback[chan];
int i;
for (i = 0; i < insn->n; i++) {
val = data[i];
das08_ao_set_data(dev, chan, val);
}
s->readback[chan] = val;
return insn->n;
}
int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
{
const struct das08_board_struct *board = dev->board_ptr;
struct das08_private_struct *devpriv = dev->private;
struct comedi_subdevice *s;
int ret;
int i;
dev->iobase = iobase;
dev->board_name = board->name;
ret = comedi_alloc_subdevices(dev, 6);
if (ret)
return ret;
s = &dev->subdevices[0];
/* ai */
if (board->ai_nbits) {
s->type = COMEDI_SUBD_AI;
/*
* XXX some boards actually have differential
* inputs instead of single ended.
* The driver does nothing with arefs though,
* so it's no big deal.
*/
s->subdev_flags = SDF_READABLE | SDF_GROUND;
s->n_chan = 8;
s->maxdata = (1 << board->ai_nbits) - 1;
s->range_table = das08_ai_lranges[board->ai_pg];
s->insn_read = das08_ai_insn_read;
devpriv->pg_gainlist = das08_ai_gainlists[board->ai_pg];
} else {
s->type = COMEDI_SUBD_UNUSED;
}
s = &dev->subdevices[1];
/* ao */
if (board->ao_nbits) {
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 2;
s->maxdata = (1 << board->ao_nbits) - 1;
s->range_table = &range_bipolar5;
s->insn_write = das08_ao_insn_write;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
/* initialize all channels to 0V */
for (i = 0; i < s->n_chan; i++) {
s->readback[i] = s->maxdata / 2;
das08_ao_set_data(dev, i, s->readback[i]);
}
} else {
s->type = COMEDI_SUBD_UNUSED;
}
s = &dev->subdevices[2];
/* di */
if (board->di_nchan) {
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE;
s->n_chan = board->di_nchan;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = board->is_jr ? das08jr_di_insn_bits :
das08_di_insn_bits;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
s = &dev->subdevices[3];
/* do */
if (board->do_nchan) {
s->type = COMEDI_SUBD_DO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = board->do_nchan;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = board->is_jr ? das08jr_do_insn_bits :
das08_do_insn_bits;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
s = &dev->subdevices[4];
/* 8255 */
if (board->i8255_offset != 0) {
ret = subdev_8255_io_init(dev, s, board->i8255_offset);
if (ret)
return ret;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
/* Counter subdevice (8254) */
s = &dev->subdevices[5];
if (board->i8254_offset) {
dev->pacer =
comedi_8254_io_alloc(dev->iobase + board->i8254_offset,
0, I8254_IO8, 0);
if (IS_ERR(dev->pacer))
return PTR_ERR(dev->pacer);
comedi_8254_subdevice_init(s, dev->pacer);
} else {
s->type = COMEDI_SUBD_UNUSED;
}
return 0;
}
EXPORT_SYMBOL_GPL(das08_common_attach);
static int __init das08_init(void)
{
return 0;
}
module_init(das08_init);
static void __exit das08_exit(void)
{
}
module_exit(das08_exit);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi common DAS08 support module");
MODULE_LICENSE("GPL");
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