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
  14 #define C2PORT_NAME_LEN                 32
  15
  16 /*
  17  * C2 port basic structs
  18  */
  19
  20 /* Main struct */
  21 struct c2port_ops;
  22 struct c2port_device {
  23         unsigned int access:1;
  24         unsigned int flash_access:1;
  25
  26         int id;
  27         char name[C2PORT_NAME_LEN];
  28         struct c2port_ops *ops;
  29         struct mutex mutex;             /* prevent races during read/write */
  30
  31         struct device *dev;
  32
  33         void *private_data;
  34 };
  35
  36 /* Basic operations */
  37 struct c2port_ops {
  38         /* Flash layout */
  39         unsigned short block_size;      /* flash block size in bytes */
  40         unsigned short blocks_num;      /* flash blocks number */
  41
  42         /* Enable or disable the access to C2 port */
  43         void (*access)(struct c2port_device *dev, int status);
  44
  45         /* Set C2D data line as input/output */
  46         void (*c2d_dir)(struct c2port_device *dev, int dir);
  47
  48         /* Read/write C2D data line */
  49         int (*c2d_get)(struct c2port_device *dev);
  50         void (*c2d_set)(struct c2port_device *dev, int status);
  51
  52         /* Write C2CK clock line */
  53         void (*c2ck_set)(struct c2port_device *dev, int status);
  54 };
  55
  56 /*
  57  * Exported functions
  58  */
  59
  60 #define to_class_dev(obj) container_of((obj), struct class_device, kobj)
  61 #define to_c2port_device(obj) container_of((obj), struct c2port_device, class)
  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);