// SPDX-License-Identifier: GPL-2.0+
/*
* Comedi driver for Data Translation DT2811
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) David A. Schleef <[email protected]>
*/
/*
* Driver: dt2811
* Description: Data Translation DT2811
* Author: ds
* Devices: [Data Translation] DT2811-PGL (dt2811-pgl), DT2811-PGH (dt2811-pgh)
* Status: works
*
* Configuration options:
* [0] - I/O port base address
* [1] - IRQ (optional, needed for async command support)
* [2] - A/D reference (# of analog inputs)
* 0 = single-ended (16 channels)
* 1 = differential (8 channels)
* 2 = pseudo-differential (16 channels)
* [3] - A/D range (deprecated, see below)
* [4] - D/A 0 range (deprecated, see below)
* [5] - D/A 1 range (deprecated, see below)
*
* Notes:
* - A/D ranges are not programmable but the gain is. The AI subdevice has
* a range_table containing all the possible analog input range/gain
* options for the dt2811-pgh or dt2811-pgl. Use the range that matches
* your board configuration and the desired gain to correctly convert
* between data values and physical units and to set the correct output
* gain.
* - D/A ranges are not programmable. The AO subdevice has a range_table
* containing all the possible analog output ranges. Use the range
* that matches your board configuration to convert between data
* values and physical units.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/comedi/comedidev.h>
/*
* Register I/O map
*/
#define DT2811_ADCSR_REG 0x00 /* r/w A/D Control/Status */
#define DT2811_ADCSR_ADDONE BIT(7) /* r 1=A/D conv done */
#define DT2811_ADCSR_ADERROR BIT(6) /* r 1=A/D error */
#define DT2811_ADCSR_ADBUSY BIT(5) /* r 1=A/D busy */
#define DT2811_ADCSR_CLRERROR BIT(4)
#define DT2811_ADCSR_DMAENB BIT(3) /* r/w 1=dma ena */
#define DT2811_ADCSR_INTENB BIT(2) /* r/w 1=interrupts ena */
#define DT2811_ADCSR_ADMODE(x) (((x) & 0x3) << 0)
#define DT2811_ADGCR_REG 0x01 /* r/w A/D Gain/Channel */
#define DT2811_ADGCR_GAIN(x) (((x) & 0x3) << 6)
#define DT2811_ADGCR_CHAN(x) (((x) & 0xf) << 0)
#define DT2811_ADDATA_LO_REG 0x02 /* r A/D Data low byte */
#define DT2811_ADDATA_HI_REG 0x03 /* r A/D Data high byte */
#define DT2811_DADATA_LO_REG(x) (0x02 + ((x) * 2)) /* w D/A Data low */
#define DT2811_DADATA_HI_REG(x) (0x03 + ((x) * 2)) /* w D/A Data high */
#define DT2811_DI_REG 0x06 /* r Digital Input Port 0 */
#define DT2811_DO_REG 0x06 /* w Digital Output Port 1 */
#define DT2811_TMRCTR_REG 0x07 /* r/w Timer/Counter */
#define DT2811_TMRCTR_MANTISSA(x) (((x) & 0x7) << 3)
#define DT2811_TMRCTR_EXPONENT(x) (((x) & 0x7) << 0)
#define DT2811_OSC_BASE 1666 /* 600 kHz = 1666.6667ns */
/*
* Timer frequency control:
* DT2811_TMRCTR_MANTISSA DT2811_TMRCTR_EXPONENT
* val divisor frequency val multiply divisor/divide frequency by
* 0 1 600 kHz 0 1
* 1 10 60 kHz 1 10
* 2 2 300 kHz 2 100
* 3 3 200 kHz 3 1000
* 4 4 150 kHz 4 10000
* 5 5 120 kHz 5 100000
* 6 6 100 kHz 6 1000000
* 7 12 50 kHz 7 10000000
*/
static const unsigned int dt2811_clk_dividers[] = {
1, 10, 2, 3, 4, 5, 6, 12
};
static const unsigned int dt2811_clk_multipliers[] = {
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
};
/*
* The Analog Input range is set using jumpers on the board.
*
* Input Range W9 W10
* -5V to +5V In Out
* -2.5V to +2.5V In In
* 0V to +5V Out In
*
* The gain may be set to 1, 2, 4, or 8 (on the dt2811-pgh) or to
* 1, 10, 100, 500 (on the dt2811-pgl).
*/
static const struct comedi_lrange dt2811_pgh_ai_ranges = {
12, {
BIP_RANGE(5), /* range 0: gain=1 */
BIP_RANGE(2.5), /* range 1: gain=2 */
BIP_RANGE(1.25), /* range 2: gain=4 */
BIP_RANGE(0.625), /* range 3: gain=8 */
BIP_RANGE(2.5), /* range 0+4: gain=1 */
BIP_RANGE(1.25), /* range 1+4: gain=2 */
BIP_RANGE(0.625), /* range 2+4: gain=4 */
BIP_RANGE(0.3125), /* range 3+4: gain=8 */
UNI_RANGE(5), /* range 0+8: gain=1 */
UNI_RANGE(2.5), /* range 1+8: gain=2 */
UNI_RANGE(1.25), /* range 2+8: gain=4 */
UNI_RANGE(0.625) /* range 3+8: gain=8 */
}
};
static const struct comedi_lrange dt2811_pgl_ai_ranges = {
12, {
BIP_RANGE(5), /* range 0: gain=1 */
BIP_RANGE(0.5), /* range 1: gain=10 */
BIP_RANGE(0.05), /* range 2: gain=100 */
BIP_RANGE(0.01), /* range 3: gain=500 */
BIP_RANGE(2.5), /* range 0+4: gain=1 */
BIP_RANGE(0.25), /* range 1+4: gain=10 */
BIP_RANGE(0.025), /* range 2+4: gain=100 */
BIP_RANGE(0.005), /* range 3+4: gain=500 */
UNI_RANGE(5), /* range 0+8: gain=1 */
UNI_RANGE(0.5), /* range 1+8: gain=10 */
UNI_RANGE(0.05), /* range 2+8: gain=100 */
UNI_RANGE(0.01) /* range 3+8: gain=500 */
}
};
/*
* The Analog Output range is set per-channel using jumpers on the board.
*
* DAC0 Jumpers DAC1 Jumpers
* Output Range W5 W6 W7 W8 W1 W2 W3 W4
* -5V to +5V In Out In Out In Out In Out
* -2.5V to +2.5V In Out Out In In Out Out In
* 0 to +5V Out In Out In Out In Out In
*/
static const struct comedi_lrange dt2811_ao_ranges = {
3, {
BIP_RANGE(5), /* default setting from factory */
BIP_RANGE(2.5),
UNI_RANGE(5)
}
};
struct dt2811_board {
const char *name;
unsigned int is_pgh:1;
};
static const struct dt2811_board dt2811_boards[] = {
{
.name = "dt2811-pgh",
.is_pgh = 1,
}, {
.name = "dt2811-pgl",
},
};
struct dt2811_private {
unsigned int ai_divisor;
};
static unsigned int dt2811_ai_read_sample(struct comedi_device *dev,
struct comedi_subdevice *s)
{
unsigned int val;
val = inb(dev->iobase + DT2811_ADDATA_LO_REG) |
(inb(dev->iobase + DT2811_ADDATA_HI_REG) << 8);
return val & s->maxdata;
}
static irqreturn_t dt2811_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
unsigned int status;
if (!dev->attached)
return IRQ_NONE;
status = inb(dev->iobase + DT2811_ADCSR_REG);
if (status & DT2811_ADCSR_ADERROR) {
async->events |= COMEDI_CB_OVERFLOW;
outb(status | DT2811_ADCSR_CLRERROR,
dev->iobase + DT2811_ADCSR_REG);
}
if (status & DT2811_ADCSR_ADDONE) {
unsigned short val;
val = dt2811_ai_read_sample(dev, s);
comedi_buf_write_samples(s, &val, 1);
}
if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg)
async->events |= COMEDI_CB_EOA;
comedi_handle_events(dev, s);
return IRQ_HANDLED;
}
static int dt2811_ai_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
/*
* Mode 0
* Single conversion
*
* Loading a chanspec will trigger a conversion.
*/
outb(DT2811_ADCSR_ADMODE(0), dev->iobase + DT2811_ADCSR_REG);
return 0;
}
static void dt2811_ai_set_chanspec(struct comedi_device *dev,
unsigned int chanspec)
{
unsigned int chan = CR_CHAN(chanspec);
unsigned int range = CR_RANGE(chanspec);
outb(DT2811_ADGCR_CHAN(chan) | DT2811_ADGCR_GAIN(range),
dev->iobase + DT2811_ADGCR_REG);
}
static int dt2811_ai_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct dt2811_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int mode;
if (cmd->start_src == TRIG_NOW) {
/*
* Mode 1
* Continuous conversion, internal trigger and clock
*
* This resets the trigger flip-flop, disabling A/D strobes.
* The timer/counter register is loaded with the division
* ratio which will give the required sample rate.
*
* Loading the first chanspec sets the trigger flip-flop,
* enabling the timer/counter. A/D strobes are then generated
* at the rate set by the internal clock/divider.
*/
mode = DT2811_ADCSR_ADMODE(1);
} else { /* TRIG_EXT */
if (cmd->convert_src == TRIG_TIMER) {
/*
* Mode 2
* Continuous conversion, external trigger
*
* Similar to Mode 1, with the exception that the
* trigger flip-flop must be set by a negative edge
* on the external trigger input.
*/
mode = DT2811_ADCSR_ADMODE(2);
} else { /* TRIG_EXT */
/*
* Mode 3
* Continuous conversion, external trigger, clock
*
* Similar to Mode 2, with the exception that the
* conversion rate is set by the frequency on the
* external clock/divider.
*/
mode = DT2811_ADCSR_ADMODE(3);
}
}
outb(mode | DT2811_ADCSR_INTENB, dev->iobase + DT2811_ADCSR_REG);
/* load timer */
outb(devpriv->ai_divisor, dev->iobase + DT2811_TMRCTR_REG);
/* load chanspec - enables timer */
dt2811_ai_set_chanspec(dev, cmd->chanlist[0]);
return 0;
}
static unsigned int dt2811_ns_to_timer(unsigned int *nanosec,
unsigned int flags)
{
unsigned long long ns;
unsigned int ns_lo = COMEDI_MIN_SPEED;
unsigned int ns_hi = 0;
unsigned int divisor_hi = 0;
unsigned int divisor_lo = 0;
unsigned int _div;
unsigned int _mult;
/*
* Work through all the divider/multiplier values to find the two
* closest divisors to generate the requested nanosecond timing.
*/
for (_div = 0; _div <= 7; _div++) {
for (_mult = 0; _mult <= 7; _mult++) {
unsigned int div = dt2811_clk_dividers[_div];
unsigned int mult = dt2811_clk_multipliers[_mult];
unsigned long long divider = div * mult;
unsigned int divisor = DT2811_TMRCTR_MANTISSA(_div) |
DT2811_TMRCTR_EXPONENT(_mult);
/*
* The timer can be configured to run at a slowest
* speed of 0.005hz (600 Khz/120000000), which requires
* 37-bits to represent the nanosecond value. Limit the
* slowest timing to what comedi handles (32-bits).
*/
ns = divider * DT2811_OSC_BASE;
if (ns > COMEDI_MIN_SPEED)
continue;
/* Check for fastest found timing */
if (ns <= *nanosec && ns > ns_hi) {
ns_hi = ns;
divisor_hi = divisor;
}
/* Check for slowest found timing */
if (ns >= *nanosec && ns < ns_lo) {
ns_lo = ns;
divisor_lo = divisor;
}
}
}
/*
* The slowest found timing will be invalid if the requested timing
* is faster than what can be generated by the timer. Fix it so that
* CMDF_ROUND_UP returns valid timing.
*/
if (ns_lo == COMEDI_MIN_SPEED) {
ns_lo = ns_hi;
divisor_lo = divisor_hi;
}
/*
* The fastest found timing will be invalid if the requested timing
* is less than what can be generated by the timer. Fix it so that
* CMDF_ROUND_NEAREST and CMDF_ROUND_DOWN return valid timing.
*/
if (ns_hi == 0) {
ns_hi = ns_lo;
divisor_hi = divisor_lo;
}
switch (flags & CMDF_ROUND_MASK) {
case CMDF_ROUND_NEAREST:
default:
if (ns_hi - *nanosec < *nanosec - ns_lo) {
*nanosec = ns_lo;
return divisor_lo;
}
*nanosec = ns_hi;
return divisor_hi;
case CMDF_ROUND_UP:
*nanosec = ns_lo;
return divisor_lo;
case CMDF_ROUND_DOWN:
*nanosec = ns_hi;
return divisor_hi;
}
}
static int dt2811_ai_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
struct dt2811_private *devpriv = dev->private;
unsigned int arg;
int err = 0;
/* Step 1 : check if triggers are trivially valid */
err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_FOLLOW);
err |= comedi_check_trigger_src(&cmd->convert_src,
TRIG_TIMER | TRIG_EXT);
err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
if (err)
return 1;
/* Step 2a : make sure trigger sources are unique */
err |= comedi_check_trigger_is_unique(cmd->start_src);
err |= comedi_check_trigger_is_unique(cmd->convert_src);
err |= comedi_check_trigger_is_unique(cmd->stop_src);
/* Step 2b : and mutually compatible */
if (cmd->convert_src == TRIG_EXT && cmd->start_src != TRIG_EXT)
err |= -EINVAL;
if (err)
return 2;
/* Step 3: check if arguments are trivially valid */
err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
if (cmd->convert_src == TRIG_TIMER)
err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 12500);
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
cmd->chanlist_len);
if (cmd->stop_src == TRIG_COUNT)
err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
else /* TRIG_NONE */
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* Step 4: fix up any arguments */
if (cmd->convert_src == TRIG_TIMER) {
arg = cmd->convert_arg;
devpriv->ai_divisor = dt2811_ns_to_timer(&arg, cmd->flags);
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
} else { /* TRIG_EXT */
/* The convert_arg is used to set the divisor. */
devpriv->ai_divisor = cmd->convert_arg;
}
if (err)
return 4;
/* Step 5: check channel list if it exists */
return 0;
}
static int dt2811_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + DT2811_ADCSR_REG);
if ((status & DT2811_ADCSR_ADBUSY) == 0)
return 0;
return -EBUSY;
}
static int dt2811_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
int ret;
int i;
/* We will already be in Mode 0 */
for (i = 0; i < insn->n; i++) {
/* load chanspec and trigger conversion */
dt2811_ai_set_chanspec(dev, insn->chanspec);
ret = comedi_timeout(dev, s, insn, dt2811_ai_eoc, 0);
if (ret)
return ret;
data[i] = dt2811_ai_read_sample(dev, s);
}
return insn->n;
}
static int dt2811_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];
outb(val & 0xff, dev->iobase + DT2811_DADATA_LO_REG(chan));
outb((val >> 8) & 0xff,
dev->iobase + DT2811_DADATA_HI_REG(chan));
}
s->readback[chan] = val;
return insn->n;
}
static int dt2811_di_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
data[1] = inb(dev->iobase + DT2811_DI_REG);
return insn->n;
}
static int dt2811_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 + DT2811_DO_REG);
data[1] = s->state;
return insn->n;
}
static void dt2811_reset(struct comedi_device *dev)
{
/* This is the initialization sequence from the users manual */
outb(DT2811_ADCSR_ADMODE(0), dev->iobase + DT2811_ADCSR_REG);
usleep_range(100, 1000);
inb(dev->iobase + DT2811_ADDATA_LO_REG);
inb(dev->iobase + DT2811_ADDATA_HI_REG);
outb(DT2811_ADCSR_ADMODE(0) | DT2811_ADCSR_CLRERROR,
dev->iobase + DT2811_ADCSR_REG);
}
static int dt2811_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct dt2811_board *board = dev->board_ptr;
struct dt2811_private *devpriv;
struct comedi_subdevice *s;
int ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
ret = comedi_request_region(dev, it->options[0], 0x8);
if (ret)
return ret;
dt2811_reset(dev);
/* IRQ's 2,3,5,7 are valid for async command support */
if (it->options[1] <= 7 && (BIT(it->options[1]) & 0xac)) {
ret = request_irq(it->options[1], dt2811_interrupt, 0,
dev->board_name, dev);
if (ret == 0)
dev->irq = it->options[1];
}
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;
/* Analog Input subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE |
((it->options[2] == 1) ? SDF_DIFF :
(it->options[2] == 2) ? SDF_COMMON : SDF_GROUND);
s->n_chan = (it->options[2] == 1) ? 8 : 16;
s->maxdata = 0x0fff;
s->range_table = board->is_pgh ? &dt2811_pgh_ai_ranges
: &dt2811_pgl_ai_ranges;
s->insn_read = dt2811_ai_insn_read;
if (dev->irq) {
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ;
s->len_chanlist = 1;
s->do_cmdtest = dt2811_ai_cmdtest;
s->do_cmd = dt2811_ai_cmd;
s->cancel = dt2811_ai_cancel;
}
/* Analog Output subdevice */
s = &dev->subdevices[1];
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 2;
s->maxdata = 0x0fff;
s->range_table = &dt2811_ao_ranges;
s->insn_write = dt2811_ao_insn_write;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
/* Digital Input subdevice */
s = &dev->subdevices[2];
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE;
s->n_chan = 8;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = dt2811_di_insn_bits;
/* Digital Output subdevice */
s = &dev->subdevices[3];
s->type = COMEDI_SUBD_DO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 8;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = dt2811_do_insn_bits;
return 0;
}
static struct comedi_driver dt2811_driver = {
.driver_name = "dt2811",
.module = THIS_MODULE,
.attach = dt2811_attach,
.detach = comedi_legacy_detach,
.board_name = &dt2811_boards[0].name,
.num_names = ARRAY_SIZE(dt2811_boards),
.offset = sizeof(struct dt2811_board),
};
module_comedi_driver(dt2811_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Data Translation DT2811 series boards");
MODULE_LICENSE("GPL");
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