<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>enum wimax_st</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs" /><link rel="up" href="ch01s06.html" title="WiMAX" /><link rel="prev" href="re194.html" title="struct wimax_dev" /><link rel="next" href="ch02.html" title="Chapter 2. Network device support" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>enum wimax_st</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re194.html">Prev</a> </td><th width="60%" align="center">WiMAX</th><td width="20%" align="right"> <a accesskey="n" href="ch02.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="enum wimax_st"><a id="API-enum-wimax-st"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>enum wimax_st — The different states of a WiMAX device </p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting"> enum wimax_st { __WIMAX_ST_NULL, WIMAX_ST_DOWN, __WIMAX_ST_QUIESCING, WIMAX_ST_UNINITIALIZED, WIMAX_ST_RADIO_OFF, WIMAX_ST_READY, WIMAX_ST_SCANNING, WIMAX_ST_CONNECTING, WIMAX_ST_CONNECTED, __WIMAX_ST_INVALID }; </pre></div><div class="refsect1" title="Constants"><a id="id2748598"></a><h2>Constants</h2><div class="variablelist"><dl><dt><span class="term">__WIMAX_ST_NULL</span></dt><dd><p> The device structure has been allocated and zeroed, but still <code class="function">wimax_dev_add</code> hasn't been called. There is no state. </p></dd><dt><span class="term">WIMAX_ST_DOWN</span></dt><dd><p> The device has been registered with the WiMAX and networking stacks, but it is not initialized (normally that is done with 'ifconfig DEV up' [or equivalent], which can upload firmware and enable communications with the device). In this state, the device is powered down and using as less power as possible. This state is the default after a call to <code class="function">wimax_dev_add</code>. It is ok to have drivers move directly to <code class="constant">WIMAX_ST_UNINITIALIZED</code> or <code class="constant">WIMAX_ST_RADIO_OFF</code> in <code class="function">_probe</code> after the call to <code class="function">wimax_dev_add</code>. It is recommended that the driver leaves this state when calling 'ifconfig DEV up' and enters it back on 'ifconfig DEV down'. </p></dd><dt><span class="term">__WIMAX_ST_QUIESCING</span></dt><dd><p> The device is being torn down, so no API operations are allowed to proceed except the ones needed to complete the device clean up process. </p></dd><dt><span class="term">WIMAX_ST_UNINITIALIZED</span></dt><dd><p> [optional] Communication with the device is setup, but the device still requires some configuration before being operational. Some WiMAX API calls might work. </p></dd><dt><span class="term">WIMAX_ST_RADIO_OFF</span></dt><dd><p> The device is fully up; radio is off (wether by hardware or software switches). It is recommended to always leave the device in this state after initialization. </p></dd><dt><span class="term">WIMAX_ST_READY</span></dt><dd><p> The device is fully up and radio is on. </p></dd><dt><span class="term">WIMAX_ST_SCANNING</span></dt><dd><p> [optional] The device has been instructed to scan. In this state, the device cannot be actively connected to a network. </p></dd><dt><span class="term">WIMAX_ST_CONNECTING</span></dt><dd><p> The device is connecting to a network. This state exists because in some devices, the connect process can include a number of negotiations between user space, kernel space and the device. User space needs to know what the device is doing. If the connect sequence in a device is atomic and fast, the device can transition directly to CONNECTED </p></dd><dt><span class="term">WIMAX_ST_CONNECTED</span></dt><dd><p> The device is connected to a network. </p></dd><dt><span class="term">__WIMAX_ST_INVALID</span></dt><dd><p> This is an invalid state used to mark the maximum numeric value of states. </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2748787"></a><h2>Description</h2><p> </p><p> Transitions from one state to another one are atomic and can only be caused in kernel space with <code class="function">wimax_state_change</code>. To read the state, use <code class="function">wimax_state_get</code>. </p><p> States starting with __ are internal and shall not be used or referred to by drivers or userspace. They look ugly, but that's the point -- if any use is made non-internal to the stack, it is easier to catch on review. </p><p> All API operations [with well defined exceptions] will take the device mutex before starting and then check the state. If the state is <code class="constant">__WIMAX_ST_NULL</code>, <code class="constant">WIMAX_ST_DOWN</code>, <code class="constant">WIMAX_ST_UNINITIALIZED</code> or <code class="constant">__WIMAX_ST_QUIESCING</code>, it will drop the lock and quit with -<code class="constant">EINVAL</code>, -<code class="constant">ENOMEDIUM</code>, -<code class="constant">ENOTCONN</code> or -<code class="constant">ESHUTDOWN</code>. </p><p> The order of the definitions is important, so we can do numerical comparisons (eg: < <code class="constant">WIMAX_ST_RADIO_OFF</code> means the device is not ready to operate). </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re194.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch01s06.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch02.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>struct wimax_dev</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 2. Network device support</td></tr></table></div></body></html>