LXR linux/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
  11struct device;
  12
  13/*
  14 * C2 port basic structs
  15 */
  16
  17/* Main struct */
  18struct c2port_ops;
  19struct 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 */
  34struct 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
  57extern struct c2port_device *c2port_device_register(char *name,
  58                                        struct c2port_ops *ops, void *devdata);
  59extern void c2port_device_unregister(struct c2port_device *dev);
  60