root/drivers/staging/comedi/drivers/amplc_pc263.c

DEFINITIONS

1. pc263_do_insn_bits
2. pc263_attach

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for Amplicon PC263 relay board.
   4  *
   5  * Copyright (C) 2002 MEV Ltd. <http://www.mev.co.uk/>
   6  *
   7  * COMEDI - Linux Control and Measurement Device Interface
   8  * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   9  */
  10 
  11 /*
  12  * Driver: amplc_pc263
  13  * Description: Amplicon PC263
  14  * Author: Ian Abbott <abbotti@mev.co.uk>
  15  * Devices: [Amplicon] PC263 (pc263)
  16  * Updated: Fri, 12 Apr 2013 15:19:36 +0100
  17  * Status: works
  18  *
  19  * Configuration options:
  20  *   [0] - I/O port base address
  21  *
  22  * The board appears as one subdevice, with 16 digital outputs, each
  23  * connected to a reed-relay. Relay contacts are closed when output is 1.
  24  * The state of the outputs can be read.
  25  */
  26 
  27 #include <linux/module.h>
  28 #include "../comedidev.h"
  29 
  30 /* PC263 registers */
  31 #define PC263_DO_0_7_REG        0x00
  32 #define PC263_DO_8_15_REG       0x01
  33 
  34 struct pc263_board {
  35         const char *name;
  36 };
  37 
  38 static const struct pc263_board pc263_boards[] = {
  39         {
  40                 .name = "pc263",
  41         },
  42 };
  43 
  44 static int pc263_do_insn_bits(struct comedi_device *dev,
  45                               struct comedi_subdevice *s,
  46                               struct comedi_insn *insn,
  47                               unsigned int *data)
  48 {
  49         if (comedi_dio_update_state(s, data)) {
  50                 outb(s->state & 0xff, dev->iobase + PC263_DO_0_7_REG);
  51                 outb((s->state >> 8) & 0xff, dev->iobase + PC263_DO_8_15_REG);
  52         }
  53 
  54         data[1] = s->state;
  55 
  56         return insn->n;
  57 }
  58 
  59 static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  60 {
  61         struct comedi_subdevice *s;
  62         int ret;
  63 
  64         ret = comedi_request_region(dev, it->options[0], 0x2);
  65         if (ret)
  66                 return ret;
  67 
  68         ret = comedi_alloc_subdevices(dev, 1);
  69         if (ret)
  70                 return ret;
  71 
  72         /* Digital Output subdevice */
  73         s = &dev->subdevices[0];
  74         s->type         = COMEDI_SUBD_DO;
  75         s->subdev_flags = SDF_WRITABLE;
  76         s->n_chan       = 16;
  77         s->maxdata      = 1;
  78         s->range_table  = &range_digital;
  79         s->insn_bits    = pc263_do_insn_bits;
  80 
  81         /* read initial relay state */
  82         s->state = inb(dev->iobase + PC263_DO_0_7_REG) |
  83                    (inb(dev->iobase + PC263_DO_8_15_REG) << 8);
  84 
  85         return 0;
  86 }
  87 
  88 static struct comedi_driver amplc_pc263_driver = {
  89         .driver_name    = "amplc_pc263",
  90         .module         = THIS_MODULE,
  91         .attach         = pc263_attach,
  92         .detach         = comedi_legacy_detach,
  93         .board_name     = &pc263_boards[0].name,
  94         .offset         = sizeof(struct pc263_board),
  95         .num_names      = ARRAY_SIZE(pc263_boards),
  96 };
  97 
  98 module_comedi_driver(amplc_pc263_driver);
  99 
 100 MODULE_AUTHOR("Comedi http://www.comedi.org");
 101 MODULE_DESCRIPTION("Comedi driver for Amplicon PC263 relay board");
 102 MODULE_LICENSE("GPL");