include/linux/c2port.h

   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
  16 struct device;
  17
  18 /*
  19  * C2 port basic structs
  20  */
  21
  22 /* Main struct */
  23 struct c2port_ops;
  24 struct 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 */
  41 struct 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
  64 extern struct c2port_device *c2port_device_register(char *name,
  65                                         struct c2port_ops *ops, void *devdata);
  66 extern void c2port_device_unregister(struct c2port_device *dev);