include/linux/wimax.h

   1 /*
   2  * Linux WiMax
   3  * API for user space
   4  *
   5  *
   6  * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  *   * Redistributions of source code must retain the above copyright
  13  *     notice, this list of conditions and the following disclaimer.
  14  *   * Redistributions in binary form must reproduce the above copyright
  15  *     notice, this list of conditions and the following disclaimer in
  16  *     the documentation and/or other materials provided with the
  17  *     distribution.
  18  *   * Neither the name of Intel Corporation nor the names of its
  19  *     contributors may be used to endorse or promote products derived
  20  *     from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  *
  35  * Intel Corporation <linux-wimax@intel.com>
  36  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  37  *  - Initial implementation
  38  *
  39  *
  40  * This file declares the user/kernel protocol that is spoken over
  41  * Generic Netlink, as well as any type declaration that is to be used
  42  * by kernel and user space.
  43  *
  44  * It is intended for user space to clone it verbatim to use it as a
  45  * primary reference for definitions.
  46  *
  47  * Stuff intended for kernel usage as well as full protocol and stack
  48  * documentation is rooted in include/net/wimax.h.
  49  */
  50
  51 #ifndef __LINUX__WIMAX_H__
  52 #define __LINUX__WIMAX_H__
  53
  54 #include <linux/types.h>
  55
  56 enum {
  57         /**
  58          * Version of the interface (unsigned decimal, MMm, max 25.5)
  59          * M - Major: change if removing or modifying an existing call.
  60          * m - minor: change when adding a new call
  61          */
  62         WIMAX_GNL_VERSION = 01,
  63         /* Generic NetLink attributes */
  64         WIMAX_GNL_ATTR_INVALID = 0x00,
  65         WIMAX_GNL_ATTR_MAX = 10,
  66 };
  67
  68
  69 /*
  70  * Generic NetLink operations
  71  *
  72  * Most of these map to an API call; _OP_ stands for operation, _RP_
  73  * for reply and _RE_ for report (aka: signal).
  74  */
  75 enum {
  76         WIMAX_GNL_OP_MSG_FROM_USER,     /* User to kernel message */
  77         WIMAX_GNL_OP_MSG_TO_USER,       /* Kernel to user message */
  78         WIMAX_GNL_OP_RFKILL,    /* Run wimax_rfkill() */
  79         WIMAX_GNL_OP_RESET,     /* Run wimax_rfkill() */
  80         WIMAX_GNL_RE_STATE_CHANGE,      /* Report: status change */
  81         WIMAX_GNL_OP_STATE_GET,         /* Request for current state */
  82 };
  83
  84
  85 /* Message from user / to user */
  86 enum {
  87         WIMAX_GNL_MSG_IFIDX = 1,
  88         WIMAX_GNL_MSG_PIPE_NAME,
  89         WIMAX_GNL_MSG_DATA,
  90 };
  91
  92
  93 /*
  94  * wimax_rfkill()
  95  *
  96  * The state of the radio (ON/OFF) is mapped to the rfkill subsystem's
  97  * switch state (DISABLED/ENABLED).
  98  */
  99 enum wimax_rf_state {
 100         WIMAX_RF_OFF = 0,       /* Radio is off, rfkill on/enabled */
 101         WIMAX_RF_ON = 1,        /* Radio is on, rfkill off/disabled */
 102         WIMAX_RF_QUERY = 2,
 103 };
 104
 105 /* Attributes */
 106 enum {
 107         WIMAX_GNL_RFKILL_IFIDX = 1,
 108         WIMAX_GNL_RFKILL_STATE,
 109 };
 110
 111
 112 /* Attributes for wimax_reset() */
 113 enum {
 114         WIMAX_GNL_RESET_IFIDX = 1,
 115 };
 116
 117 /* Atributes for wimax_state_get() */
 118 enum {
 119         WIMAX_GNL_STGET_IFIDX = 1,
 120 };
 121
 122 /*
 123  * Attributes for the Report State Change
 124  *
 125  * For now we just have the old and new states; new attributes might
 126  * be added later on.
 127  */
 128 enum {
 129         WIMAX_GNL_STCH_IFIDX = 1,
 130         WIMAX_GNL_STCH_STATE_OLD,
 131         WIMAX_GNL_STCH_STATE_NEW,
 132 };
 133
 134
 135 /**
 136  * enum wimax_st - The different states of a WiMAX device
 137  * @__WIMAX_ST_NULL: The device structure has been allocated and zeroed,
 138  *     but still wimax_dev_add() hasn't been called. There is no state.
 139  *
 140  * @WIMAX_ST_DOWN: The device has been registered with the WiMAX and
 141  *     networking stacks, but it is not initialized (normally that is
 142  *     done with 'ifconfig DEV up' [or equivalent], which can upload
 143  *     firmware and enable communications with the device).
 144  *     In this state, the device is powered down and using as less
 145  *     power as possible.
 146  *     This state is the default after a call to wimax_dev_add(). It
 147  *     is ok to have drivers move directly to %WIMAX_ST_UNINITIALIZED
 148  *     or %WIMAX_ST_RADIO_OFF in _probe() after the call to
 149  *     wimax_dev_add().
 150  *     It is recommended that the driver leaves this state when
 151  *     calling 'ifconfig DEV up' and enters it back on 'ifconfig DEV
 152  *     down'.
 153  *
 154  * @__WIMAX_ST_QUIESCING: The device is being torn down, so no API
 155  *     operations are allowed to proceed except the ones needed to
 156  *     complete the device clean up process.
 157  *
 158  * @WIMAX_ST_UNINITIALIZED: [optional] Communication with the device
 159  *     is setup, but the device still requires some configuration
 160  *     before being operational.
 161  *     Some WiMAX API calls might work.
 162  *
 163  * @WIMAX_ST_RADIO_OFF: The device is fully up; radio is off (wether
 164  *     by hardware or software switches).
 165  *     It is recommended to always leave the device in this state
 166  *     after initialization.
 167  *
 168  * @WIMAX_ST_READY: The device is fully up and radio is on.
 169  *
 170  * @WIMAX_ST_SCANNING: [optional] The device has been instructed to
 171  *     scan. In this state, the device cannot be actively connected to
 172  *     a network.
 173  *
 174  * @WIMAX_ST_CONNECTING: The device is connecting to a network. This
 175  *     state exists because in some devices, the connect process can
 176  *     include a number of negotiations between user space, kernel
 177  *     space and the device. User space needs to know what the device
 178  *     is doing. If the connect sequence in a device is atomic and
 179  *     fast, the device can transition directly to CONNECTED
 180  *
 181  * @WIMAX_ST_CONNECTED: The device is connected to a network.
 182  *
 183  * @__WIMAX_ST_INVALID: This is an invalid state used to mark the
 184  *     maximum numeric value of states.
 185  *
 186  * Description:
 187  *
 188  * Transitions from one state to another one are atomic and can only
 189  * be caused in kernel space with wimax_state_change(). To read the
 190  * state, use wimax_state_get().
 191  *
 192  * States starting with __ are internal and shall not be used or
 193  * referred to by drivers or userspace. They look ugly, but that's the
 194  * point -- if any use is made non-internal to the stack, it is easier
 195  * to catch on review.
 196  *
 197  * All API operations [with well defined exceptions] will take the
 198  * device mutex before starting and then check the state. If the state
 199  * is %__WIMAX_ST_NULL, %WIMAX_ST_DOWN, %WIMAX_ST_UNINITIALIZED or
 200  * %__WIMAX_ST_QUIESCING, it will drop the lock and quit with
 201  * -%EINVAL, -%ENOMEDIUM, -%ENOTCONN or -%ESHUTDOWN.
 202  *
 203  * The order of the definitions is important, so we can do numerical
 204  * comparisons (eg: < %WIMAX_ST_RADIO_OFF means the device is not ready
 205  * to operate).
 206  */
 207 /*
 208  * The allowed state transitions are described in the table below
 209  * (states in rows can go to states in columns where there is an X):
 210  *
 211  *                                  UNINI   RADIO READY SCAN CONNEC CONNEC
 212  *             NULL DOWN QUIESCING TIALIZED  OFF        NING  TING   TED
 213  * NULL         -    x
 214  * DOWN              -      x        x       x
 215  * QUIESCING         x      -
 216  * UNINITIALIZED            x        -       x
 217  * RADIO_OFF                x                -     x
 218  * READY                    x                x     -     x     x      x
 219  * SCANNING                 x                x     x     -     x      x
 220  * CONNECTING               x                x     x     x     -      x
 221  * CONNECTED                x                x     x                  -
 222  *
 223  * This table not available in kernel-doc because the formatting messes it up.
 224  */
 225  enum wimax_st {
 226         __WIMAX_ST_NULL = 0,
 227         WIMAX_ST_DOWN,
 228         __WIMAX_ST_QUIESCING,
 229         WIMAX_ST_UNINITIALIZED,
 230         WIMAX_ST_RADIO_OFF,
 231         WIMAX_ST_READY,
 232         WIMAX_ST_SCANNING,
 233         WIMAX_ST_CONNECTING,
 234         WIMAX_ST_CONNECTED,
 235         __WIMAX_ST_INVALID                      /* Always keep last */
 236 };
 237
 238
 239 #endif /* #ifndef __LINUX__WIMAX_H__ */