include/linux/c2port.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Silicon Labs C2 port Linux support
   4  *
   5  *  Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it>
   6  *  Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it>
   7  */
   8
   9 #define C2PORT_NAME_LEN                 32
  10
  11 struct device;
  12
  13 /*
  14  * C2 port basic structs
  15  */
  16
  17 /* Main struct */
  18 struct c2port_ops;
  19 struct c2port_device {
  20         unsigned int access:1;
  21         unsigned int flash_access:1;
  22
  23         int id;
  24         char name[C2PORT_NAME_LEN];
  25         struct c2port_ops *ops;
  26         struct mutex mutex;             /* prevent races during read/write */
  27
  28         struct device *dev;
  29
  30         void *private_data;
  31 };
  32
  33 /* Basic operations */
  34 struct c2port_ops {
  35         /* Flash layout */
  36         unsigned short block_size;      /* flash block size in bytes */
  37         unsigned short blocks_num;      /* flash blocks number */
  38
  39         /* Enable or disable the access to C2 port */
  40         void (*access)(struct c2port_device *dev, int status);
  41
  42         /* Set C2D data line as input/output */
  43         void (*c2d_dir)(struct c2port_device *dev, int dir);
  44
  45         /* Read/write C2D data line */
  46         int (*c2d_get)(struct c2port_device *dev);
  47         void (*c2d_set)(struct c2port_device *dev, int status);
  48
  49         /* Write C2CK clock line */
  50         void (*c2ck_set)(struct c2port_device *dev, int status);
  51 };
  52
  53 /*
  54  * Exported functions
  55  */
  56
  57 extern struct c2port_device *c2port_device_register(char *name,
  58                                         struct c2port_ops *ops, void *devdata);
  59 extern void c2port_device_unregister(struct c2port_device *dev);