| 1 | /* |
| 2 | |
| 3 | comedi/drivers/aio_aio12_8.c |
| 4 | |
| 5 | Driver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board |
| 6 | Copyright (C) 2006 C&C Technologies, Inc. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | |
| 25 | Driver: aio_aio12_8 |
| 26 | Description: Acces I/O Products PC-104 AIO12-8 Analog I/O Board |
| 27 | Author: Pablo Mejia <pablo.mejia@cctechnol.com> |
| 28 | Devices: |
| 29 | [Acces I/O] PC-104 AIO12-8 |
| 30 | Status: experimental |
| 31 | |
| 32 | Configuration Options: |
| 33 | [0] - I/O port base address |
| 34 | |
| 35 | Notes: |
| 36 | |
| 37 | Only synchronous operations are supported. |
| 38 | |
| 39 | */ |
| 40 | |
| 41 | #include "../comedidev.h" |
| 42 | #include <linux/ioport.h> |
| 43 | #include "8255.h" |
| 44 | |
| 45 | #define AIO12_8_STATUS 0x00 |
| 46 | #define AIO12_8_INTERRUPT 0x01 |
| 47 | #define AIO12_8_ADC 0x02 |
| 48 | #define AIO12_8_DAC_0 0x04 |
| 49 | #define AIO12_8_DAC_1 0x06 |
| 50 | #define AIO12_8_DAC_2 0x08 |
| 51 | #define AIO12_8_DAC_3 0x0A |
| 52 | #define AIO12_8_COUNTER_0 0x0C |
| 53 | #define AIO12_8_COUNTER_1 0x0D |
| 54 | #define AIO12_8_COUNTER_2 0x0E |
| 55 | #define AIO12_8_COUNTER_CONTROL 0x0F |
| 56 | #define AIO12_8_DIO_0 0x10 |
| 57 | #define AIO12_8_DIO_1 0x11 |
| 58 | #define AIO12_8_DIO_2 0x12 |
| 59 | #define AIO12_8_DIO_STATUS 0x13 |
| 60 | #define AIO12_8_DIO_CONTROL 0x14 |
| 61 | #define AIO12_8_ADC_TRIGGER_CONTROL 0x15 |
| 62 | #define AIO12_8_TRIGGER 0x16 |
| 63 | #define AIO12_8_POWER 0x17 |
| 64 | |
| 65 | #define STATUS_ADC_EOC 0x80 |
| 66 | |
| 67 | #define ADC_MODE_NORMAL 0x00 |
| 68 | #define ADC_MODE_INTERNAL_CLOCK 0x40 |
| 69 | #define ADC_MODE_STANDBY 0x80 |
| 70 | #define ADC_MODE_POWERDOWN 0xC0 |
| 71 | |
| 72 | #define DAC_ENABLE 0x18 |
| 73 | |
| 74 | struct aio12_8_boardtype { |
| 75 | const char *name; |
| 76 | }; |
| 77 | |
| 78 | static const struct aio12_8_boardtype board_types[] = { |
| 79 | { |
| 80 | .name = "aio_aio12_8"}, |
| 81 | }; |
| 82 | |
| 83 | #define thisboard ((const struct aio12_8_boardtype *) dev->board_ptr) |
| 84 | |
| 85 | struct aio12_8_private { |
| 86 | unsigned int ao_readback[4]; |
| 87 | }; |
| 88 | |
| 89 | #define devpriv ((struct aio12_8_private *) dev->private) |
| 90 | |
| 91 | static int aio_aio12_8_ai_read(struct comedi_device *dev, |
| 92 | struct comedi_subdevice *s, |
| 93 | struct comedi_insn *insn, unsigned int *data) |
| 94 | { |
| 95 | int n; |
| 96 | unsigned char control = |
| 97 | ADC_MODE_NORMAL | |
| 98 | (CR_RANGE(insn->chanspec) << 3) | CR_CHAN(insn->chanspec); |
| 99 | |
| 100 | /* read status to clear EOC latch */ |
| 101 | inb(dev->iobase + AIO12_8_STATUS); |
| 102 | |
| 103 | for (n = 0; n < insn->n; n++) { |
| 104 | int timeout = 5; |
| 105 | |
| 106 | /* Setup and start conversion */ |
| 107 | outb(control, dev->iobase + AIO12_8_ADC); |
| 108 | |
| 109 | /* Wait for conversion to complete */ |
| 110 | while (timeout && |
| 111 | !(inb(dev->iobase + AIO12_8_STATUS) & STATUS_ADC_EOC)) { |
| 112 | timeout--; |
| 113 | printk(KERN_ERR "timeout %d\n", timeout); |
| 114 | udelay(1); |
| 115 | } |
| 116 | if (timeout == 0) { |
| 117 | comedi_error(dev, "ADC timeout"); |
| 118 | return -EIO; |
| 119 | } |
| 120 | |
| 121 | data[n] = inw(dev->iobase + AIO12_8_ADC) & 0x0FFF; |
| 122 | } |
| 123 | return n; |
| 124 | } |
| 125 | |
| 126 | static int aio_aio12_8_ao_read(struct comedi_device *dev, |
| 127 | struct comedi_subdevice *s, |
| 128 | struct comedi_insn *insn, unsigned int *data) |
| 129 | { |
| 130 | int i; |
| 131 | int val = devpriv->ao_readback[CR_CHAN(insn->chanspec)]; |
| 132 | |
| 133 | for (i = 0; i < insn->n; i++) |
| 134 | data[i] = val; |
| 135 | return insn->n; |
| 136 | } |
| 137 | |
| 138 | static int aio_aio12_8_ao_write(struct comedi_device *dev, |
| 139 | struct comedi_subdevice *s, |
| 140 | struct comedi_insn *insn, unsigned int *data) |
| 141 | { |
| 142 | int i; |
| 143 | int chan = CR_CHAN(insn->chanspec); |
| 144 | unsigned long port = dev->iobase + AIO12_8_DAC_0 + (2 * chan); |
| 145 | |
| 146 | /* enable DACs */ |
| 147 | outb(0x01, dev->iobase + DAC_ENABLE); |
| 148 | |
| 149 | for (i = 0; i < insn->n; i++) { |
| 150 | outb(data[i] & 0xFF, port); /* LSB */ |
| 151 | outb((data[i] >> 8) & 0x0F, port + 1); /* MSB */ |
| 152 | devpriv->ao_readback[chan] = data[i]; |
| 153 | } |
| 154 | return insn->n; |
| 155 | } |
| 156 | |
| 157 | static const struct comedi_lrange range_aio_aio12_8 = { |
| 158 | 4, |
| 159 | { |
| 160 | UNI_RANGE(5), |
| 161 | BIP_RANGE(5), |
| 162 | UNI_RANGE(10), |
| 163 | BIP_RANGE(10), |
| 164 | } |
| 165 | }; |
| 166 | |
| 167 | static int aio_aio12_8_attach(struct comedi_device *dev, |
| 168 | struct comedi_devconfig *it) |
| 169 | { |
| 170 | int iobase; |
| 171 | struct comedi_subdevice *s; |
| 172 | |
| 173 | iobase = it->options[0]; |
| 174 | if (!request_region(iobase, 24, "aio_aio12_8")) { |
| 175 | printk(KERN_ERR "I/O port conflict"); |
| 176 | return -EIO; |
| 177 | } |
| 178 | |
| 179 | dev->board_name = thisboard->name; |
| 180 | |
| 181 | dev->iobase = iobase; |
| 182 | |
| 183 | if (alloc_private(dev, sizeof(struct aio12_8_private)) < 0) |
| 184 | return -ENOMEM; |
| 185 | |
| 186 | if (alloc_subdevices(dev, 3) < 0) |
| 187 | return -ENOMEM; |
| 188 | |
| 189 | s = &dev->subdevices[0]; |
| 190 | s->type = COMEDI_SUBD_AI; |
| 191 | s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF; |
| 192 | s->n_chan = 8; |
| 193 | s->maxdata = (1 << 12) - 1; |
| 194 | s->range_table = &range_aio_aio12_8; |
| 195 | s->insn_read = aio_aio12_8_ai_read; |
| 196 | |
| 197 | s = &dev->subdevices[1]; |
| 198 | s->type = COMEDI_SUBD_AO; |
| 199 | s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF; |
| 200 | s->n_chan = 4; |
| 201 | s->maxdata = (1 << 12) - 1; |
| 202 | s->range_table = &range_aio_aio12_8; |
| 203 | s->insn_read = aio_aio12_8_ao_read; |
| 204 | s->insn_write = aio_aio12_8_ao_write; |
| 205 | |
| 206 | s = &dev->subdevices[2]; |
| 207 | subdev_8255_init(dev, s, NULL, dev->iobase + AIO12_8_DIO_0); |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | static int aio_aio12_8_detach(struct comedi_device *dev) |
| 213 | { |
| 214 | subdev_8255_cleanup(dev, &dev->subdevices[2]); |
| 215 | if (dev->iobase) |
| 216 | release_region(dev->iobase, 24); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static struct comedi_driver driver_aio_aio12_8 = { |
| 221 | .driver_name = "aio_aio12_8", |
| 222 | .module = THIS_MODULE, |
| 223 | .attach = aio_aio12_8_attach, |
| 224 | .detach = aio_aio12_8_detach, |
| 225 | .board_name = &board_types[0].name, |
| 226 | .num_names = 1, |
| 227 | .offset = sizeof(struct aio12_8_boardtype), |
| 228 | }; |
| 229 | |
| 230 | static int __init driver_aio_aio12_8_init_module(void) |
| 231 | { |
| 232 | return comedi_driver_register(&driver_aio_aio12_8); |
| 233 | } |
| 234 | |
| 235 | static void __exit driver_aio_aio12_8_cleanup_module(void) |
| 236 | { |
| 237 | comedi_driver_unregister(&driver_aio_aio12_8); |
| 238 | } |
| 239 | |
| 240 | module_init(driver_aio_aio12_8_init_module); |
| 241 | module_exit(driver_aio_aio12_8_cleanup_module); |
| 242 | |
| 243 | MODULE_AUTHOR("Comedi http://www.comedi.org"); |
| 244 | MODULE_DESCRIPTION("Comedi low-level driver"); |
| 245 | MODULE_LICENSE("GPL"); |