| /* |
| |
| comedi/drivers/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. |
| |
| 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. |
| */ |
| |
| /* |
| |
| Driver: aio_aio12_8 |
| Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board |
| Author: Pablo Mejia <pablo.mejia@cctechnol.com> |
| 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 AO12-8 (aio_ao12_8) |
| Status: experimental |
| |
| Configuration Options: |
| [0] - I/O port base address |
| |
| Notes: |
| |
| Only synchronous operations are supported. |
| |
| */ |
| |
| #include "../comedidev.h" |
| #include <linux/ioport.h> |
| #include "8255.h" |
| |
| /* |
| * Register map |
| */ |
| #define AIO12_8_STATUS_REG 0x00 |
| #define AIO12_8_STATUS_ADC_EOC (1 << 7) |
| #define AIO12_8_STATUS_PORT_C_COS (1 << 6) |
| #define AIO12_8_STATUS_IRQ_ENA (1 << 2) |
| #define AIO12_8_INTERRUPT_REG 0x01 |
| #define AIO12_8_INTERRUPT_ADC (1 << 7) |
| #define AIO12_8_INTERRUPT_COS (1 << 6) |
| #define AIO12_8_INTERRUPT_COUNTER1 (1 << 5) |
| #define AIO12_8_INTERRUPT_PORT_C3 (1 << 4) |
| #define AIO12_8_INTERRUPT_PORT_C0 (1 << 3) |
| #define AIO12_8_INTERRUPT_ENA (1 << 2) |
| #define AIO12_8_ADC_REG 0x02 |
| #define AIO12_8_ADC_MODE_NORMAL (0 << 6) |
| #define AIO12_8_ADC_MODE_INT_CLK (1 << 6) |
| #define AIO12_8_ADC_MODE_STANDBY (2 << 6) |
| #define AIO12_8_ADC_MODE_POWERDOWN (3 << 6) |
| #define AIO12_8_ADC_ACQ_3USEC (0 << 5) |
| #define AIO12_8_ADC_ACQ_PROGRAM (1 << 5) |
| #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 (1 << 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 (1 << 1) |
| #define AIO12_8_TRIGGER_DACTRIG (1 << 0) |
| #define AIO12_8_COS_REG 0x17 |
| #define AIO12_8_DAC_ENABLE_REG 0x18 |
| #define AIO12_8_DAC_ENABLE_REF_ENA (1 << 0) |
| |
| struct aio12_8_boardtype { |
| const char *name; |
| int ai_nchan; |
| int ao_nchan; |
| }; |
| |
| static const struct aio12_8_boardtype board_types[] = { |
| { |
| .name = "aio_aio12_8", |
| .ai_nchan = 8, |
| .ao_nchan = 4, |
| }, { |
| .name = "aio_ai12_8", |
| .ai_nchan = 8, |
| }, { |
| .name = "aio_ao12_8", |
| .ao_nchan = 4, |
| }, |
| }; |
| |
| struct aio12_8_private { |
| unsigned int ao_readback[4]; |
| }; |
| |
| 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 n; |
| |
| /* |
| * 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 (n = 0; n < insn->n; n++) { |
| int timeout = 5; |
| |
| /* Setup and start conversion */ |
| outb(control, dev->iobase + AIO12_8_ADC_REG); |
| |
| /* Wait for conversion to complete */ |
| do { |
| val = inb(dev->iobase + AIO12_8_STATUS_REG); |
| timeout--; |
| if (timeout == 0) { |
| dev_err(dev->class_dev, "ADC timeout\n"); |
| return -ETIMEDOUT; |
| } |
| } while (!(val & AIO12_8_STATUS_ADC_EOC)); |
| |
| data[n] = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata; |
| } |
| |
| return insn->n; |
| } |
| |
| static int aio_aio12_8_ao_read(struct comedi_device *dev, |
| struct comedi_subdevice *s, |
| struct comedi_insn *insn, unsigned int *data) |
| { |
| struct aio12_8_private *devpriv = dev->private; |
| unsigned int chan = CR_CHAN(insn->chanspec); |
| int val = devpriv->ao_readback[chan]; |
| int i; |
| |
| for (i = 0; i < insn->n; i++) |
| data[i] = val; |
| return insn->n; |
| } |
| |
| static int aio_aio12_8_ao_write(struct comedi_device *dev, |
| struct comedi_subdevice *s, |
| struct comedi_insn *insn, unsigned int *data) |
| { |
| struct aio12_8_private *devpriv = dev->private; |
| unsigned int chan = CR_CHAN(insn->chanspec); |
| unsigned long port = dev->iobase + AIO12_8_DAC_REG(chan); |
| unsigned int val = 0; |
| 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, port); |
| } |
| |
| devpriv->ao_readback[chan] = val; |
| |
| return insn->n; |
| } |
| |
| static const struct comedi_lrange range_aio_aio12_8 = { |
| 4, |
| { |
| UNI_RANGE(5), |
| BIP_RANGE(5), |
| UNI_RANGE(10), |
| BIP_RANGE(10), |
| } |
| }; |
| |
| static int aio_aio12_8_attach(struct comedi_device *dev, |
| struct comedi_devconfig *it) |
| { |
| const struct aio12_8_boardtype *board = comedi_board(dev); |
| struct aio12_8_private *devpriv; |
| struct comedi_subdevice *s; |
| int ret; |
| |
| ret = comedi_request_region(dev, it->options[0], 32); |
| if (ret) |
| return ret; |
| |
| devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL); |
| if (!devpriv) |
| return -ENOMEM; |
| dev->private = devpriv; |
| |
| ret = comedi_alloc_subdevices(dev, 4); |
| if (ret) |
| return ret; |
| |
| s = &dev->subdevices[0]; |
| if (board->ai_nchan) { |
| /* Analog input subdevice */ |
| s->type = COMEDI_SUBD_AI; |
| s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF; |
| s->n_chan = board->ai_nchan; |
| s->maxdata = 0x0fff; |
| s->range_table = &range_aio_aio12_8; |
| s->insn_read = aio_aio12_8_ai_read; |
| } else { |
| s->type = COMEDI_SUBD_UNUSED; |
| } |
| |
| s = &dev->subdevices[1]; |
| if (board->ao_nchan) { |
| /* Analog output subdevice */ |
| s->type = COMEDI_SUBD_AO; |
| s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF; |
| s->n_chan = 4; |
| s->maxdata = 0x0fff; |
| s->range_table = &range_aio_aio12_8; |
| s->insn_read = aio_aio12_8_ao_read; |
| s->insn_write = aio_aio12_8_ao_write; |
| } else { |
| s->type = COMEDI_SUBD_UNUSED; |
| } |
| |
| s = &dev->subdevices[2]; |
| /* 8255 Digital i/o subdevice */ |
| ret = subdev_8255_init(dev, s, NULL, |
| dev->iobase + AIO12_8_8255_BASE_REG); |
| if (ret) |
| return ret; |
| |
| s = &dev->subdevices[3]; |
| /* 8254 counter/timer subdevice */ |
| s->type = COMEDI_SUBD_UNUSED; |
| |
| dev_info(dev->class_dev, "%s: %s attached\n", |
| dev->driver->driver_name, dev->board_name); |
| |
| 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 http://www.comedi.org"); |
| MODULE_DESCRIPTION("Comedi low-level driver"); |
| MODULE_LICENSE("GPL"); |