release/src-rt-6.x.4708/linux/linux-2.6.36/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,
  24                          struct comedi_devconfig *it);
  25 static int pcl725_detach(struct comedi_device *dev);
  26 static struct comedi_driver driver_pcl725 = {
  27         .driver_name = "pcl725",
  28         .module = THIS_MODULE,
  29         .attach = pcl725_attach,
  30         .detach = pcl725_detach,
  31 };
  32
  33 static int __init driver_pcl725_init_module(void)
  34 {
  35         return comedi_driver_register(&driver_pcl725);
  36 }
  37
  38 static void __exit driver_pcl725_cleanup_module(void)
  39 {
  40         comedi_driver_unregister(&driver_pcl725);
  41 }
  42
  43 module_init(driver_pcl725_init_module);
  44 module_exit(driver_pcl725_cleanup_module);
  45
  46 static int pcl725_do_insn(struct comedi_device *dev, struct comedi_subdevice *s,
  47                           struct comedi_insn *insn, unsigned int *data)
  48 {
  49         if (insn->n != 2)
  50                 return -EINVAL;
  51
  52         if (data[0]) {
  53                 s->state &= ~data[0];
  54                 s->state |= (data[0] & data[1]);
  55                 outb(s->state, dev->iobase + PCL725_DO);
  56         }
  57
  58         data[1] = s->state;
  59
  60         return 2;
  61 }
  62
  63 static int pcl725_di_insn(struct comedi_device *dev, struct comedi_subdevice *s,
  64                           struct comedi_insn *insn, unsigned int *data)
  65 {
  66         if (insn->n != 2)
  67                 return -EINVAL;
  68
  69         data[1] = inb(dev->iobase + PCL725_DI);
  70
  71         return 2;
  72 }
  73
  74 static int pcl725_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  75 {
  76         struct comedi_subdevice *s;
  77         unsigned long iobase;
  78
  79         iobase = it->options[0];
  80         printk(KERN_INFO "comedi%d: pcl725: 0x%04lx ", dev->minor, iobase);
  81         if (!request_region(iobase, PCL725_SIZE, "pcl725")) {
  82                 printk("I/O port conflict\n");
  83                 return -EIO;
  84         }
  85         dev->board_name = "pcl725";
  86         dev->iobase = iobase;
  87         dev->irq = 0;
  88
  89         if (alloc_subdevices(dev, 2) < 0)
  90                 return -ENOMEM;
  91
  92         s = dev->subdevices + 0;
  93         /* do */
  94         s->type = COMEDI_SUBD_DO;
  95         s->subdev_flags = SDF_WRITABLE;
  96         s->maxdata = 1;
  97         s->n_chan = 8;
  98         s->insn_bits = pcl725_do_insn;
  99         s->range_table = &range_digital;
 100
 101         s = dev->subdevices + 1;
 102         /* di */
 103         s->type = COMEDI_SUBD_DI;
 104         s->subdev_flags = SDF_READABLE;
 105         s->maxdata = 1;
 106         s->n_chan = 8;
 107         s->insn_bits = pcl725_di_insn;
 108         s->range_table = &range_digital;
 109
 110         printk(KERN_INFO "\n");
 111
 112         return 0;
 113 }
 114
 115 static int pcl725_detach(struct comedi_device *dev)
 116 {
 117         printk(KERN_INFO "comedi%d: pcl725: remove\n", dev->minor);
 118
 119         if (dev->iobase)
 120                 release_region(dev->iobase, PCL725_SIZE);
 121
 122         return 0;
 123 }
 124
 125 MODULE_AUTHOR("Comedi http://www.comedi.org");
 126 MODULE_DESCRIPTION("Comedi low-level driver");
 127 MODULE_LICENSE("GPL");