drivers/staging/comedi/drivers/pcl725.c

   1 /*
   2  * comedi/drivers/pcl725.c
   3  * Driver for PCL725 and clones
   4  * David A. Schleef
   5  */
   6 /*
   7 Driver: pcl725
   8 Description: Advantech PCL-725 (& compatibles)
   9 Author: ds
  10 Status: unknown
  11 Devices: [Advantech] PCL-725 (pcl725)
  12 */
  13
  14 #include "../comedidev.h"
  15
  16 #include <linux/ioport.h>
  17
  18 #define PCL725_SIZE 2
  19
  20 #define PCL725_DO 0
  21 #define PCL725_DI 1
  22
  23 static int pcl725_attach(struct comedi_device * dev, comedi_devconfig * it);
  24 static int pcl725_detach(struct comedi_device * dev);
  25 static struct comedi_driver driver_pcl725 = {
  26       driver_name:"pcl725",
  27       module:THIS_MODULE,
  28       attach:pcl725_attach,
  29       detach:pcl725_detach,
  30 };
  31
  32 COMEDI_INITCLEANUP(driver_pcl725);
  33
  34 static int pcl725_do_insn(struct comedi_device * dev, struct comedi_subdevice * s,
  35         struct comedi_insn * insn, unsigned int * data)
  36 {
  37         if (insn->n != 2)
  38                 return -EINVAL;
  39
  40         if (data[0]) {
  41                 s->state &= ~data[0];
  42                 s->state |= (data[0] & data[1]);
  43                 outb(s->state, dev->iobase + PCL725_DO);
  44         }
  45
  46         data[1] = s->state;
  47
  48         return 2;
  49 }
  50
  51 static int pcl725_di_insn(struct comedi_device * dev, struct comedi_subdevice * s,
  52         struct comedi_insn * insn, unsigned int * data)
  53 {
  54         if (insn->n != 2)
  55                 return -EINVAL;
  56
  57         data[1] = inb(dev->iobase + PCL725_DI);
  58
  59         return 2;
  60 }
  61
  62 static int pcl725_attach(struct comedi_device * dev, comedi_devconfig * it)
  63 {
  64         struct comedi_subdevice *s;
  65         unsigned long iobase;
  66
  67         iobase = it->options[0];
  68         printk("comedi%d: pcl725: 0x%04lx ", dev->minor, iobase);
  69         if (!request_region(iobase, PCL725_SIZE, "pcl725")) {
  70                 printk("I/O port conflict\n");
  71                 return -EIO;
  72         }
  73         dev->board_name = "pcl725";
  74         dev->iobase = iobase;
  75         dev->irq = 0;
  76
  77         if (alloc_subdevices(dev, 2) < 0)
  78                 return -ENOMEM;
  79
  80         s = dev->subdevices + 0;
  81         /* do */
  82         s->type = COMEDI_SUBD_DO;
  83         s->subdev_flags = SDF_WRITABLE;
  84         s->maxdata = 1;
  85         s->n_chan = 8;
  86         s->insn_bits = pcl725_do_insn;
  87         s->range_table = &range_digital;
  88
  89         s = dev->subdevices + 1;
  90         /* di */
  91         s->type = COMEDI_SUBD_DI;
  92         s->subdev_flags = SDF_READABLE;
  93         s->maxdata = 1;
  94         s->n_chan = 8;
  95         s->insn_bits = pcl725_di_insn;
  96         s->range_table = &range_digital;
  97
  98         printk("\n");
  99
 100         return 0;
 101 }
 102
 103 static int pcl725_detach(struct comedi_device * dev)
 104 {
 105         printk("comedi%d: pcl725: remove\n", dev->minor);
 106
 107         if (dev->iobase)
 108                 release_region(dev->iobase, PCL725_SIZE);
 109
 110         return 0;
 111 }