// SPDX-License-Identifier: GPL-2.0+
/*
* aio_aio12_8.c
* Driver for Access I/O Products PC-104 AIO12-8 Analog I/O Board
* Copyright (C) 2006 C&C Technologies, Inc.
*/
/*
* Driver: aio_aio12_8
* Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board
* Author: Pablo Mejia <[email protected]>
* Devices: [Access I/O] PC-104 AIO12-8 (aio_aio12_8),
* [Access I/O] PC-104 AI12-8 (aio_ai12_8),
* [Access I/O] PC-104 AO12-4 (aio_ao12_4)
* Status: experimental
*
* Configuration Options:
* [0] - I/O port base address
*
* Notes:
* Only synchronous operations are supported.
*/
#include <linux/module.h>
#include <linux/comedi/comedidev.h>
#include <linux/comedi/comedi_8255.h>
#include <linux/comedi/comedi_8254.h>
/*
* Register map
*/
#define AIO12_8_STATUS_REG 0x00
#define AIO12_8_STATUS_ADC_EOC BIT(7)
#define AIO12_8_STATUS_PORT_C_COS BIT(6)
#define AIO12_8_STATUS_IRQ_ENA BIT(2)
#define AIO12_8_INTERRUPT_REG 0x01
#define AIO12_8_INTERRUPT_ADC BIT(7)
#define AIO12_8_INTERRUPT_COS BIT(6)
#define AIO12_8_INTERRUPT_COUNTER1 BIT(5)
#define AIO12_8_INTERRUPT_PORT_C3 BIT(4)
#define AIO12_8_INTERRUPT_PORT_C0 BIT(3)
#define AIO12_8_INTERRUPT_ENA BIT(2)
#define AIO12_8_ADC_REG 0x02
#define AIO12_8_ADC_MODE(x) (((x) & 0x3) << 6)
#define AIO12_8_ADC_MODE_NORMAL AIO12_8_ADC_MODE(0)
#define AIO12_8_ADC_MODE_INT_CLK AIO12_8_ADC_MODE(1)
#define AIO12_8_ADC_MODE_STANDBY AIO12_8_ADC_MODE(2)
#define AIO12_8_ADC_MODE_POWERDOWN AIO12_8_ADC_MODE(3)
#define AIO12_8_ADC_ACQ(x) (((x) & 0x1) << 5)
#define AIO12_8_ADC_ACQ_3USEC AIO12_8_ADC_ACQ(0)
#define AIO12_8_ADC_ACQ_PROGRAM AIO12_8_ADC_ACQ(1)
#define AIO12_8_ADC_RANGE(x) ((x) << 3)
#define AIO12_8_ADC_CHAN(x) ((x) << 0)
#define AIO12_8_DAC_REG(x) (0x04 + (x) * 2)
#define AIO12_8_8254_BASE_REG 0x0c
#define AIO12_8_8255_BASE_REG 0x10
#define AIO12_8_DIO_CONTROL_REG 0x14
#define AIO12_8_DIO_CONTROL_TST BIT(0)
#define AIO12_8_ADC_TRIGGER_REG 0x15
#define AIO12_8_ADC_TRIGGER_RANGE(x) ((x) << 3)
#define AIO12_8_ADC_TRIGGER_CHAN(x) ((x) << 0)
#define AIO12_8_TRIGGER_REG 0x16
#define AIO12_8_TRIGGER_ADTRIG BIT(1)
#define AIO12_8_TRIGGER_DACTRIG BIT(0)
#define AIO12_8_COS_REG 0x17
#define AIO12_8_DAC_ENABLE_REG 0x18
#define AIO12_8_DAC_ENABLE_REF_ENA BIT(0)
static const struct comedi_lrange aio_aio12_8_range = {
4, {
UNI_RANGE(5),
BIP_RANGE(5),
UNI_RANGE(10),
BIP_RANGE(10)
}
};
struct aio12_8_boardtype {
const char *name;
unsigned int has_ai:1;
unsigned int has_ao:1;
};
static const struct aio12_8_boardtype board_types[] = {
{
.name = "aio_aio12_8",
.has_ai = 1,
.has_ao = 1,
}, {
.name = "aio_ai12_8",
.has_ai = 1,
}, {
.name = "aio_ao12_4",
.has_ao = 1,
},
};
static int aio_aio12_8_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + AIO12_8_STATUS_REG);
if (status & AIO12_8_STATUS_ADC_EOC)
return 0;
return -EBUSY;
}
static int aio_aio12_8_ai_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
unsigned int val;
unsigned char control;
int ret;
int i;
/*
* Setup the control byte for internal 2MHz clock, 3uS conversion,
* at the desired range of the requested channel.
*/
control = AIO12_8_ADC_MODE_NORMAL | AIO12_8_ADC_ACQ_3USEC |
AIO12_8_ADC_RANGE(range) | AIO12_8_ADC_CHAN(chan);
/* Read status to clear EOC latch */
inb(dev->iobase + AIO12_8_STATUS_REG);
for (i = 0; i < insn->n; i++) {
/* Setup and start conversion */
outb(control, dev->iobase + AIO12_8_ADC_REG);
/* Wait for conversion to complete */
ret = comedi_timeout(dev, s, insn, aio_aio12_8_ai_eoc, 0);
if (ret)
return ret;
val = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata;
/* munge bipolar 2's complement data to offset binary */
if (comedi_range_is_bipolar(s, range))
val = comedi_offset_munge(s, val);
data[i] = val;
}
return insn->n;
}
static int aio_aio12_8_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;
/* enable DACs */
outb(AIO12_8_DAC_ENABLE_REF_ENA, dev->iobase + AIO12_8_DAC_ENABLE_REG);
for (i = 0; i < insn->n; i++) {
val = data[i];
outw(val, dev->iobase + AIO12_8_DAC_REG(chan));
}
s->readback[chan] = val;
return insn->n;
}
static int aio_aio12_8_counter_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
switch (data[0]) {
case INSN_CONFIG_GET_CLOCK_SRC:
/*
* Channels 0 and 2 have external clock sources.
* Channel 1 has a fixed 1 MHz clock source.
*/
data[0] = 0;
data[1] = (chan == 1) ? I8254_OSC_BASE_1MHZ : 0;
break;
default:
return -EINVAL;
}
return insn->n;
}
static int aio_aio12_8_attach(struct comedi_device *dev,
struct comedi_devconfig *it)
{
const struct aio12_8_boardtype *board = dev->board_ptr;
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 32);
if (ret)
return ret;
dev->pacer = comedi_8254_io_alloc(dev->iobase + AIO12_8_8254_BASE_REG,
0, I8254_IO8, 0);
if (IS_ERR(dev->pacer))
return PTR_ERR(dev->pacer);
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;
/* Analog Input subdevice */
s = &dev->subdevices[0];
if (board->has_ai) {
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
s->n_chan = 8;
s->maxdata = 0x0fff;
s->range_table = &aio_aio12_8_range;
s->insn_read = aio_aio12_8_ai_read;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
/* Analog Output subdevice */
s = &dev->subdevices[1];
if (board->has_ao) {
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
s->n_chan = 4;
s->maxdata = 0x0fff;
s->range_table = &aio_aio12_8_range;
s->insn_write = aio_aio12_8_ao_insn_write;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
/* Digital I/O subdevice (8255) */
s = &dev->subdevices[2];
ret = subdev_8255_io_init(dev, s, AIO12_8_8255_BASE_REG);
if (ret)
return ret;
/* Counter subdevice (8254) */
s = &dev->subdevices[3];
comedi_8254_subdevice_init(s, dev->pacer);
dev->pacer->insn_config = aio_aio12_8_counter_insn_config;
return 0;
}
static struct comedi_driver aio_aio12_8_driver = {
.driver_name = "aio_aio12_8",
.module = THIS_MODULE,
.attach = aio_aio12_8_attach,
.detach = comedi_legacy_detach,
.board_name = &board_types[0].name,
.num_names = ARRAY_SIZE(board_types),
.offset = sizeof(struct aio12_8_boardtype),
};
module_comedi_driver(aio_aio12_8_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Access I/O AIO12-8 Analog I/O Board");
MODULE_LICENSE("GPL");
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