3 Mini-drivers for POC (Piece of Crap) boards
4 Copyright (C) 2000 Frank Mori Hess <fmhess@uiuc.edu>
5 Copyright (C) 2001 David A. Schleef <ds@schleef.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 Description: Generic driver for very simple devices
26 Devices: [Keithley Metrabyte] DAC-02 (dac02)
28 This driver is indended to support very simple ISA-based devices,
30 dac02 - Keithley DAC-02 analog output board
32 Configuration options:
36 dac02 - Keithley DAC-02 analog output board driver
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/sched.h>
44 #include <linux/slab.h>
45 #include <linux/errno.h>
46 #include <linux/ioport.h>
47 #include <linux/delay.h>
48 #include <linux/interrupt.h>
49 #include <linux/timex.h>
50 #include <linux/timer.h>
52 #include <linux/comedidev.h>
54 /* DAC-02 registers */
55 #define DAC02_LSB(a) (2 * a)
56 #define DAC02_MSB(a) (2 * a + 1)
58 static int poc_attach(comedi_device *dev,comedi_devconfig *it);
59 static int poc_detach(comedi_device *dev);
60 static int dac02_ao_winsn(comedi_device *dev,comedi_subdevice *s,comedi_insn *insn,lsampl_t *data);
61 static int readback_insn(comedi_device *dev,comedi_subdevice *s,comedi_insn *insn,lsampl_t *data);
63 struct boarddef_struct{
66 int (*setup)(comedi_device *);
70 int (*winsn)(comedi_device *,comedi_subdevice *,comedi_insn *,lsampl_t *);
71 int (*rinsn)(comedi_device *,comedi_subdevice *,comedi_insn *,lsampl_t *);
74 static struct boarddef_struct boards[]={
82 winsn: dac02_ao_winsn,
84 range: &range_unknown,
87 #define n_boards (sizeof(boards)/sizeof(boards[0]))
88 #define this_board ((struct boarddef_struct *)dev->board_ptr)
90 static comedi_driver driver_poc=
98 offset: sizeof(boards[0]),
101 static int poc_attach(comedi_device *dev, comedi_devconfig *it)
106 iobase = it->options[0];
107 printk("comedi%d: poc: using %s iobase 0x%x\n", dev->minor,
108 this_board->name, iobase);
110 dev->board_name = this_board->name;
114 printk("io base address required\n");
118 iosize = this_board->iosize;
119 /* check if io addresses are available */
120 if(check_region(iobase, iosize) < 0)
122 printk("I/O port conflict: failed to allocate ports 0x%x to 0x%x\n",
123 iobase, iobase + iosize - 1);
126 request_region(iobase, iosize, "dac02");
127 dev->iobase = iobase;
129 dev->n_subdevices = 1;
130 if(alloc_subdevices(dev) < 0)
132 if(alloc_private(dev,sizeof(lsampl_t)*this_board->n_chan) < 0)
135 /* analog output subdevice */
136 s=dev->subdevices + 0;
137 s->type = this_board->type;
138 s->n_chan = this_board->n_chan;
139 s->maxdata = (1<<this_board->n_bits)-1;
140 s->range_table = this_board->range;
141 s->insn_write = this_board->winsn;
142 s->insn_read = this_board->rinsn;
143 if(s->type==COMEDI_SUBD_AO || s->type==COMEDI_SUBD_DO){
144 s->subdev_flags = SDF_WRITEABLE;
150 static int poc_detach(comedi_device *dev)
152 /* only free stuff if it has been allocated by _attach */
154 release_region(dev->iobase, this_board->iosize);
156 printk("comedi%d: dac02: remove\n", dev->minor);
161 static int readback_insn(comedi_device *dev,comedi_subdevice *s,comedi_insn *insn,lsampl_t *data)
165 chan = CR_CHAN(insn->chanspec);
166 data[0]=((lsampl_t *)dev->private)[chan];
171 static int dac02_ao_winsn(comedi_device *dev,comedi_subdevice *s,comedi_insn *insn,lsampl_t *data)
177 chan = CR_CHAN(insn->chanspec);
178 ((lsampl_t *)dev->private)[chan] = data[0];
181 // convert to complementary binary if range is bipolar
182 if((CR_RANGE(insn->chanspec) & 0x2) == 0)
185 temp = (output << 4) & 0xf0;
186 outb(temp, dev->iobase + DAC02_LSB(chan));
187 temp = (output >> 4) & 0xff;
188 outb(temp, dev->iobase + DAC02_MSB(chan));
193 COMEDI_INITCLEANUP(driver_poc);