diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/dt2817.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/dt2817.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/dt2817.c b/drivers/staging/comedi/drivers/dt2817.c new file mode 100644 index 000000000000..2dc396a44e6f --- /dev/null +++ b/drivers/staging/comedi/drivers/dt2817.c @@ -0,0 +1,178 @@ +/* + comedi/drivers/dt2817.c + Hardware driver for Data Translation DT2817 + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 1998 David A. Schleef <ds@schleef.org> + + 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. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ +/* +Driver: dt2817 +Description: Data Translation DT2817 +Author: ds +Status: complete +Devices: [Data Translation] DT2817 (dt2817) + +A very simple digital I/O card. Four banks of 8 lines, each bank +is configurable for input or output. One wonders why it takes a +50 page manual to describe this thing. + +The driver (which, btw, is much less than 50 pages) has 1 subdevice +with 32 channels, configurable in groups of 8. + +Configuration options: + [0] - I/O port base base address +*/ + +#include "../comedidev.h" + +#include <linux/ioport.h> + +#define DT2817_SIZE 5 + +#define DT2817_CR 0 +#define DT2817_DATA 1 + +static int dt2817_attach(struct comedi_device * dev, struct comedi_devconfig * it); +static int dt2817_detach(struct comedi_device * dev); +static struct comedi_driver driver_dt2817 = { + driver_name:"dt2817", + module:THIS_MODULE, + attach:dt2817_attach, + detach:dt2817_detach, +}; + +COMEDI_INITCLEANUP(driver_dt2817); + +static int dt2817_dio_insn_config(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + int mask; + int chan; + int oe = 0; + + if (insn->n != 1) + return -EINVAL; + + chan = CR_CHAN(insn->chanspec); + if (chan < 8) { + mask = 0xff; + } else if (chan < 16) { + mask = 0xff00; + } else if (chan < 24) { + mask = 0xff0000; + } else + mask = 0xff000000; + if (data[0]) + s->io_bits |= mask; + else + s->io_bits &= ~mask; + + if (s->io_bits & 0x000000ff) + oe |= 0x1; + if (s->io_bits & 0x0000ff00) + oe |= 0x2; + if (s->io_bits & 0x00ff0000) + oe |= 0x4; + if (s->io_bits & 0xff000000) + oe |= 0x8; + + outb(oe, dev->iobase + DT2817_CR); + + return 1; +} + +static int dt2817_dio_insn_bits(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + unsigned int changed; + + /* It's questionable whether it is more important in + * a driver like this to be deterministic or fast. + * We choose fast. */ + + if (data[0]) { + changed = s->state; + s->state &= ~data[0]; + s->state |= (data[0] & data[1]); + changed ^= s->state; + changed &= s->io_bits; + if (changed & 0x000000ff) + outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0); + if (changed & 0x0000ff00) + outb((s->state >> 8) & 0xff, + dev->iobase + DT2817_DATA + 1); + if (changed & 0x00ff0000) + outb((s->state >> 16) & 0xff, + dev->iobase + DT2817_DATA + 2); + if (changed & 0xff000000) + outb((s->state >> 24) & 0xff, + dev->iobase + DT2817_DATA + 3); + } + data[1] = inb(dev->iobase + DT2817_DATA + 0); + data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8); + data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16); + data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24); + + return 2; +} + +static int dt2817_attach(struct comedi_device * dev, struct comedi_devconfig * it) +{ + int ret; + struct comedi_subdevice *s; + unsigned long iobase; + + iobase = it->options[0]; + printk("comedi%d: dt2817: 0x%04lx ", dev->minor, iobase); + if (!request_region(iobase, DT2817_SIZE, "dt2817")) { + printk("I/O port conflict\n"); + return -EIO; + } + dev->iobase = iobase; + dev->board_name = "dt2817"; + + if ((ret = alloc_subdevices(dev, 1)) < 0) + return ret; + + s = dev->subdevices + 0; + + s->n_chan = 32; + s->type = COMEDI_SUBD_DIO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->range_table = &range_digital; + s->maxdata = 1; + s->insn_bits = dt2817_dio_insn_bits; + s->insn_config = dt2817_dio_insn_config; + + s->state = 0; + outb(0, dev->iobase + DT2817_CR); + + printk("\n"); + + return 0; +} + +static int dt2817_detach(struct comedi_device * dev) +{ + printk("comedi%d: dt2817: remove\n", dev->minor); + + if (dev->iobase) + release_region(dev->iobase, DT2817_SIZE); + + return 0; +} |