transport.c.htm

光驱cdrom读写源代码,scsi命令解析

<a class="l" name="163">    163 </a>			 * long write operation in progress, ms_delay is
<a class="l" name="164">    164 </a>			 * used for some fast drives with a short drive
<a class="l" name="165">    165 </a>			 * buffer. Such as Pioneer DVD-RW drives. They will
<a class="l" name="166">    166 </a>			 * begin to generate TOC when the buffer is initially
<a class="l" name="167">    167 </a>			 * full, then resume operation a few minutes later
<a class="l" name="168">    168 </a>			 * with the buffer emptying quickly.
<a class="l" name="169">    169 </a>			 */</span>
<a class="hl" name="170">    170 </a>			<b>if</b> ((<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">2</span>) &amp;&amp; (<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">4</span>) &amp;&amp;
<a class="l" name="171">    171 </a>			    (<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">8</span>)) {
<a class="l" name="172">    172 </a>				<a href="/source/s?defs=total_retries">total_retries</a>++;
<a class="l" name="173">    173 </a>				<span class="c">/*
<a class="l" name="174">    174 </a>				 * In Simulation write mode, we use the
<a class="l" name="175">    175 </a>				 * READ_INFO_CMD to check if all the previous
<a class="l" name="176">    176 </a>				 * writes completed. Sleeping 500 ms will not
<a class="l" name="177">    177 </a>				 * be sufficient in all cases for DVDs.
<a class="l" name="178">    178 </a>				 */</span>
<a class="l" name="179">    179 </a>				<b>if</b> ((<a href="/source/s?defs=device_type">device_type</a> != <a href="/source/s?defs=CD_RW">CD_RW</a>) &amp;&amp;
<a class="hl" name="180">    180 </a>				    ((<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=CLOSE_TRACK_CMD">CLOSE_TRACK_CMD</a>) ||
<a class="l" name="181">    181 </a>				    ((<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=READ_INFO_CMD">READ_INFO_CMD</a>) &amp;&amp;
<a class="l" name="182">    182 </a>				    <a href="/source/s?defs=simulation">simulation</a>)))
<a class="l" name="183">    183 </a>					(<b>void</b>) <a href="/source/s?defs=sleep">sleep</a>(<span class="n">3</span>);
<a class="l" name="184">    184 </a>				<b>else</b>
<a class="l" name="185">    185 </a>					<a href="/source/s?defs=ms_delay">ms_delay</a>(<span class="n">500</span>);
<a class="l" name="186">    186 </a>				<b>continue</b>;
<a class="l" name="187">    187 </a>			}
<a class="l" name="188">    188 </a>			<span class="c">/*
<a class="l" name="189">    189 </a>			 * Device is not ready to transmit or a device reset
<a class="hl" name="190">    190 </a>			 * has occurred. wait for a short period of time then
<a class="l" name="191">    191 </a>			 * retry the command.
<a class="l" name="192">    192 </a>			 */</span>
<a class="l" name="193">    193 </a>			<b>if</b> ((<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">6</span>) &amp;&amp; ((<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0x28</span>) ||
<a class="l" name="194">    194 </a>			    (<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0x29</span>))) {
<a class="l" name="195">    195 </a>				(<b>void</b>) <a href="/source/s?defs=sleep">sleep</a>(<span class="n">3</span>);
<a class="l" name="196">    196 </a>				<a href="/source/s?defs=total_retries">total_retries</a>++;
<a class="l" name="197">    197 </a>				<b>continue</b>;
<a class="l" name="198">    198 </a>			}
<a class="l" name="199">    199 </a>
<a class="hl" name="200">    200 </a>			<b>if</b> ((<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">5</span>) &amp;&amp;
<a class="l" name="201">    201 </a>			    (<a href="/source/s?defs=device_type">device_type</a> == <a href="/source/s?defs=DVD_PLUS">DVD_PLUS</a> ||
<a class="l" name="202">    202 </a>			    <a href="/source/s?defs=device_type">device_type</a> == <a href="/source/s?defs=DVD_PLUS_W">DVD_PLUS_W</a>)) {
<a class="l" name="203">    203 </a>				<b>if</b> (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=MODE_SELECT_10_CMD">MODE_SELECT_10_CMD</a> &amp;&amp;
<a class="l" name="204">    204 </a>				    <a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0x26</span>) {
<a class="l" name="205">    205 </a>					<a href="/source/s?defs=ret">ret</a> = <span class="n">1</span>;
<a class="l" name="206">    206 </a>					<b>break</b>;
<a class="l" name="207">    207 </a>				}
<a class="l" name="208">    208 </a>
<a class="l" name="209">    209 </a>				<b>if</b> (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=REZERO_UNIT_CMD">REZERO_UNIT_CMD</a> &amp;&amp;
<a class="hl" name="210">    210 </a>				    <a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0x20</span>) {
<a class="l" name="211">    211 </a>					<a href="/source/s?defs=ret">ret</a> = <span class="n">1</span>;
<a class="l" name="212">    212 </a>					<b>break</b>;
<a class="l" name="213">    213 </a>				}
<a class="l" name="214">    214 </a>
<a class="l" name="215">    215 </a>			}
<a class="l" name="216">    216 </a>			<span class="c">/*
<a class="l" name="217">    217 </a>			 * Blank Sense, we don't know what the error is or if
<a class="l" name="218">    218 </a>			 * the command succeeded, Hope for the best. Some
<a class="l" name="219">    219 </a>			 * drives return blank sense periodically and will
<a class="hl" name="220">    220 </a>			 * fail if this is removed.
<a class="l" name="221">    221 </a>			 */</span>
<a class="l" name="222">    222 </a>			<b>if</b> ((<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0</span>) &amp;&amp; (<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0</span>) &amp;&amp;
<a class="l" name="223">    223 </a>			    (<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0</span>)) {
<a class="l" name="224">    224 </a>				<a href="/source/s?defs=ret">ret</a> = <span class="n">0</span>;
<a class="l" name="225">    225 </a>				<b>break</b>;
<a class="l" name="226">    226 </a>			}
<a class="l" name="227">    227 </a>
<a class="l" name="228">    228 </a>			<b>if</b> (<a href="/source/s?defs=debug">debug</a>) {
<a class="l" name="229">    229 </a>				(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<span class="s">"cmd: 0x%02x ret:%i status:%02x "</span>
<a class="hl" name="230">    230 </a>				    <span class="s">" sense: %02x ASC: %02x ASCQ:%02x\n"</span>,
<a class="l" name="231">    231 </a>				    (<a href="/source/s?defs=uchar_t">uchar_t</a>)<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>], <a href="/source/s?defs=ret">ret</a>,
<a class="l" name="232">    232 </a>				    <a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_status">uscsi_status</a>,
<a class="l" name="233">    233 </a>				    (<a href="/source/s?defs=uchar_t">uchar_t</a>)<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>),
<a class="l" name="234">    234 </a>				    (<a href="/source/s?defs=uchar_t">uchar_t</a>)<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>), (<a href="/source/s?defs=uchar_t">uchar_t</a>)<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>));
<a class="l" name="235">    235 </a>			}
<a class="l" name="236">    236 </a>		}
<a class="l" name="237">    237 </a>
<a class="l" name="238">    238 </a>		<span class="c">/* no errors we'll return */</span>
<a class="l" name="239">    239 </a>		<b>break</b>;
<a class="hl" name="240">    240 </a>	}
<a class="l" name="241">    241 </a>
<a class="l" name="242">    242 </a>	<span class="c">/* store the error status for later debug printing */</span>
<a class="l" name="243">    243 </a>	<b>if</b> ((<a href="/source/s?defs=ret">ret</a> &lt; <span class="n">0</span>) &amp;&amp; (<a href="/source/s?defs=global_rqsense">global_rqsense</a>)) {
<a class="l" name="244">    244 </a>		<a href="/source/s?defs=uscsi_status">uscsi_status</a> = <a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_status">uscsi_status</a>;
<a class="l" name="245">    245 </a>		<a href="/source/s?defs=rqstatus">rqstatus</a> = <a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_rqstatus">uscsi_rqstatus</a>;
<a class="l" name="246">    246 </a>		<a href="/source/s?defs=rqresid">rqresid</a> = <a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_rqresid">uscsi_rqresid</a>;
<a class="l" name="247">    247 </a>
<a class="l" name="248">    248 </a>	}
<a class="l" name="249">    249 </a>
<a class="hl" name="250">    250 </a>	<b>if</b> (<a href="/source/s?defs=debug">debug</a> &amp;&amp; <a href="/source/s?defs=retries">retries</a>) {
<a class="l" name="251">    251 </a>		(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<span class="s">"total retries: %d\n"</span>, <a href="/source/s?defs=total_retries">total_retries</a>);
<a class="l" name="252">    252 </a>	}
<a class="l" name="253">    253 </a>
<a class="l" name="254">    254 </a>	<b>return</b> (<a href="/source/s?defs=ret">ret</a>);
<a class="l" name="255">    255 </a>}
<a class="l" name="256">    256 </a></pre></div>
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