include/linux/siox.h

   1 /*
   2  * Copyright (C) 2015 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it under
   5  * the terms of the GNU General Public License version 2 as published by the
   6  * Free Software Foundation.
   7  */
   8
   9 #include <linux/device.h>
  10
  11 #define to_siox_device(_dev)    container_of((_dev), struct siox_device, dev)
  12 struct siox_device {
  13         struct list_head node; /* node in smaster->devices */
  14         struct siox_master *smaster;
  15         struct device dev;
  16
  17         const char *type;
  18         size_t inbytes;
  19         size_t outbytes;
  20         u8 statustype;
  21
  22         u8 status_read_clean;
  23         u8 status_written;
  24         u8 status_written_lastcycle;
  25         bool connected;
  26
  27         /* statistics */
  28         unsigned int watchdog_errors;
  29         unsigned int status_errors;
  30
  31         struct kernfs_node *status_errors_kn;
  32         struct kernfs_node *watchdog_kn;
  33         struct kernfs_node *watchdog_errors_kn;
  34         struct kernfs_node *connected_kn;
  35 };
  36
  37 bool siox_device_synced(struct siox_device *sdevice);
  38 bool siox_device_connected(struct siox_device *sdevice);
  39
  40 struct siox_driver {
  41         int (*probe)(struct siox_device *sdevice);
  42         int (*remove)(struct siox_device *sdevice);
  43         void (*shutdown)(struct siox_device *sdevice);
  44
  45         /*
  46          * buf is big enough to hold sdev->inbytes - 1 bytes, the status byte
  47          * is in the scope of the framework.
  48          */
  49         int (*set_data)(struct siox_device *sdevice, u8 status, u8 buf[]);
  50         /*
  51          * buf is big enough to hold sdev->outbytes - 1 bytes, the status byte
  52          * is in the scope of the framework
  53          */
  54         int (*get_data)(struct siox_device *sdevice, const u8 buf[]);
  55
  56         struct device_driver driver;
  57 };
  58
  59 static inline struct siox_driver *to_siox_driver(struct device_driver *driver)
  60 {
  61         if (driver)
  62                 return container_of(driver, struct siox_driver, driver);
  63         else
  64                 return NULL;
  65 }
  66
  67 int __siox_driver_register(struct siox_driver *sdriver, struct module *owner);
  68
  69 static inline int siox_driver_register(struct siox_driver *sdriver)
  70 {
  71         return __siox_driver_register(sdriver, THIS_MODULE);
  72 }
  73
  74 static inline void siox_driver_unregister(struct siox_driver *sdriver)
  75 {
  76         return driver_unregister(&sdriver->driver);
  77 }