linux/include/linux/c2port.h
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   1/*
   2 *  Silicon Labs C2 port Linux support
   3 *
   4 *  Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it>
   5 *  Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License version 2 as published by
   9 * the Free Software Foundation
  10 */
  11
  12#include <linux/kmemcheck.h>
  13
  14#define C2PORT_NAME_LEN                 32
  15
  16struct device;
  17
  18/*
  19 * C2 port basic structs
  20 */
  21
  22/* Main struct */
  23struct c2port_ops;
  24struct c2port_device {
  25        kmemcheck_bitfield_begin(flags);
  26        unsigned int access:1;
  27        unsigned int flash_access:1;
  28        kmemcheck_bitfield_end(flags);
  29
  30        int id;
  31        char name[C2PORT_NAME_LEN];
  32        struct c2port_ops *ops;
  33        struct mutex mutex;             /* prevent races during read/write */
  34
  35        struct device *dev;
  36
  37        void *private_data;
  38};
  39
  40/* Basic operations */
  41struct c2port_ops {
  42        /* Flash layout */
  43        unsigned short block_size;      /* flash block size in bytes */
  44        unsigned short blocks_num;      /* flash blocks number */
  45
  46        /* Enable or disable the access to C2 port */
  47        void (*access)(struct c2port_device *dev, int status);
  48
  49        /* Set C2D data line as input/output */
  50        void (*c2d_dir)(struct c2port_device *dev, int dir);
  51
  52        /* Read/write C2D data line */
  53        int (*c2d_get)(struct c2port_device *dev);
  54        void (*c2d_set)(struct c2port_device *dev, int status);
  55
  56        /* Write C2CK clock line */
  57        void (*c2ck_set)(struct c2port_device *dev, int status);
  58};
  59
  60/*
  61 * Exported functions
  62 */
  63
  64extern struct c2port_device *c2port_device_register(char *name,
  65                                        struct c2port_ops *ops, void *devdata);
  66extern void c2port_device_unregister(struct c2port_device *dev);
  67
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