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/device.h>
  13 #include <linux/kmemcheck.h>
  14
  15 #define C2PORT_NAME_LEN                 32
  16
  17 /*
  18  * C2 port basic structs
  19  */
  20
  21 /* Main struct */
  22 struct c2port_ops;
  23 struct c2port_device {
  24         kmemcheck_bitfield_begin(flags);
  25         unsigned int access:1;
  26         unsigned int flash_access:1;
  27         kmemcheck_bitfield_end(flags);
  28
  29         int id;
  30         char name[C2PORT_NAME_LEN];
  31         struct c2port_ops *ops;
  32         struct mutex mutex;             /* prevent races during read/write */
  33
  34         struct device *dev;
  35
  36         void *private_data;
  37 };
  38
  39 /* Basic operations */
  40 struct c2port_ops {
  41         /* Flash layout */
  42         unsigned short block_size;      /* flash block size in bytes */
  43         unsigned short blocks_num;      /* flash blocks number */
  44
  45         /* Enable or disable the access to C2 port */
  46         void (*access)(struct c2port_device *dev, int status);
  47
  48         /* Set C2D data line as input/output */
  49         void (*c2d_dir)(struct c2port_device *dev, int dir);
  50
  51         /* Read/write C2D data line */
  52         int (*c2d_get)(struct c2port_device *dev);
  53         void (*c2d_set)(struct c2port_device *dev, int status);
  54
  55         /* Write C2CK clock line */
  56         void (*c2ck_set)(struct c2port_device *dev, int status);
  57 };
  58
  59 /*
  60  * Exported functions
  61  */
  62
  63 extern struct c2port_device *c2port_device_register(char *name,
  64                                         struct c2port_ops *ops, void *devdata);
  65 extern void c2port_device_unregister(struct c2port_device *dev);