diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/pcmad.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcmad.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/pcmad.c b/drivers/staging/comedi/drivers/pcmad.c new file mode 100644 index 000000000000..fc2a73d97c24 --- /dev/null +++ b/drivers/staging/comedi/drivers/pcmad.c @@ -0,0 +1,173 @@ +/* + comedi/drivers/pcmad.c + Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16 + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 2000,2001 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: pcmad +Description: Winsystems PCM-A/D12, PCM-A/D16 +Author: ds +Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16) +Status: untested + +This driver was written on a bet that I couldn't write a driver +in less than 2 hours. I won the bet, but never got paid. =( + +Configuration options: + [0] - I/O port base + [1] - unused + [2] - Analog input reference + 0 = single ended + 1 = differential + [3] - Analog input encoding (must match jumpers) + 0 = straight binary + 1 = two's complement +*/ + +#include "../comedidev.h" + +#include <linux/ioport.h> + +#define PCMAD_SIZE 4 + +#define PCMAD_STATUS 0 +#define PCMAD_LSB 1 +#define PCMAD_MSB 2 +#define PCMAD_CONVERT 1 + +struct pcmad_board_struct { + const char *name; + int n_ai_bits; +}; +static const struct pcmad_board_struct pcmad_boards[] = { + { + name: "pcmad12", + n_ai_bits:12, + }, + { + name: "pcmad16", + n_ai_bits:16, + }, +}; + +#define this_board ((const struct pcmad_board_struct *)(dev->board_ptr)) +#define n_pcmad_boards (sizeof(pcmad_boards)/sizeof(pcmad_boards[0])) + +struct pcmad_priv_struct { + int differential; + int twos_comp; +}; +#define devpriv ((struct pcmad_priv_struct *)dev->private) + +static int pcmad_attach(struct comedi_device * dev, struct comedi_devconfig * it); +static int pcmad_detach(struct comedi_device * dev); +static struct comedi_driver driver_pcmad = { + driver_name:"pcmad", + module:THIS_MODULE, + attach:pcmad_attach, + detach:pcmad_detach, + board_name:&pcmad_boards[0].name, + num_names:n_pcmad_boards, + offset:sizeof(pcmad_boards[0]), +}; + +COMEDI_INITCLEANUP(driver_pcmad); + +#define TIMEOUT 100 + +static int pcmad_ai_insn_read(struct comedi_device * dev, struct comedi_subdevice * s, + struct comedi_insn * insn, unsigned int * data) +{ + int i; + int chan; + int n; + + chan = CR_CHAN(insn->chanspec); + + for (n = 0; n < insn->n; n++) { + outb(chan, dev->iobase + PCMAD_CONVERT); + + for (i = 0; i < TIMEOUT; i++) { + if ((inb(dev->iobase + PCMAD_STATUS) & 0x3) == 0x3) + break; + } + data[n] = inb(dev->iobase + PCMAD_LSB); + data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8); + + if (devpriv->twos_comp) { + data[n] ^= (1 << (this_board->n_ai_bits - 1)); + } + } + + return n; +} + +/* + * options: + * 0 i/o base + * 1 unused + * 2 0=single ended 1=differential + * 3 0=straight binary 1=two's comp + */ +static int pcmad_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: pcmad: 0x%04lx ", dev->minor, iobase); + if (!request_region(iobase, PCMAD_SIZE, "pcmad")) { + printk("I/O port conflict\n"); + return -EIO; + } + dev->iobase = iobase; + + if ((ret = alloc_subdevices(dev, 1)) < 0) + return ret; + if ((ret = alloc_private(dev, sizeof(struct pcmad_priv_struct))) < 0) + return ret; + + dev->board_name = this_board->name; + + s = dev->subdevices + 0; + s->type = COMEDI_SUBD_AI; + s->subdev_flags = SDF_READABLE | AREF_GROUND; + s->n_chan = 16; /* XXX */ + s->len_chanlist = 1; + s->insn_read = pcmad_ai_insn_read; + s->maxdata = (1 << this_board->n_ai_bits) - 1; + s->range_table = &range_unknown; + + return 0; +} + +static int pcmad_detach(struct comedi_device * dev) +{ + printk("comedi%d: pcmad: remove\n", dev->minor); + + if (dev->irq) { + free_irq(dev->irq, dev); + } + if (dev->iobase) + release_region(dev->iobase, PCMAD_SIZE); + + return 0; +} |