serial.c

linux字符驱动源码

<a name=L283 href="source/kernel/chr_drv/serial.c?v=0.97#L283">283</a> }
<a name=L284 href="source/kernel/chr_drv/serial.c?v=0.97#L284">284</a> 
<a name=L285 href="source/kernel/chr_drv/serial.c?v=0.97#L285">285</a> void <a href="ident?v=0.97;i=serial_close">serial_close</a>(unsigned line, struct <a href="ident?v=0.97;i=file">file</a> * filp)
<a name=L286 href="source/kernel/chr_drv/serial.c?v=0.97#L286">286</a> {
<a name=L287 href="source/kernel/chr_drv/serial.c?v=0.97#L287">287</a>         struct <a href="ident?v=0.97;i=serial_struct">serial_struct</a> * <a href="ident?v=0.97;i=info">info</a>;
<a name=L288 href="source/kernel/chr_drv/serial.c?v=0.97#L288">288</a>         int irq;
<a name=L289 href="source/kernel/chr_drv/serial.c?v=0.97#L289">289</a> 
<a name=L290 href="source/kernel/chr_drv/serial.c?v=0.97#L290">290</a>         if (line &gt;= <a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>)
<a name=L291 href="source/kernel/chr_drv/serial.c?v=0.97#L291">291</a>                 return;
<a name=L292 href="source/kernel/chr_drv/serial.c?v=0.97#L292">292</a>         <a href="ident?v=0.97;i=info">info</a> = <a href="ident?v=0.97;i=serial_table">serial_table</a> + line;
<a name=L293 href="source/kernel/chr_drv/serial.c?v=0.97#L293">293</a>         if (!<a href="ident?v=0.97;i=info">info</a>-&gt;port)
<a name=L294 href="source/kernel/chr_drv/serial.c?v=0.97#L294">294</a>                 return;
<a name=L295 href="source/kernel/chr_drv/serial.c?v=0.97#L295">295</a>         <a href="ident?v=0.97;i=outb">outb</a>(0x00,<a href="ident?v=0.97;i=info">info</a>-&gt;port+4);        <b><i>/* reset DTR, RTS, */</i></b>
<a name=L296 href="source/kernel/chr_drv/serial.c?v=0.97#L296">296</a>         irq = <a href="ident?v=0.97;i=info">info</a>-&gt;irq;
<a name=L297 href="source/kernel/chr_drv/serial.c?v=0.97#L297">297</a>         if (irq == 2)
<a name=L298 href="source/kernel/chr_drv/serial.c?v=0.97#L298">298</a>                 irq = 9;
<a name=L299 href="source/kernel/chr_drv/serial.c?v=0.97#L299">299</a>         <a href="ident?v=0.97;i=free_irq">free_irq</a>(irq);
<a name=L300 href="source/kernel/chr_drv/serial.c?v=0.97#L300">300</a> }
<a name=L301 href="source/kernel/chr_drv/serial.c?v=0.97#L301">301</a> 
<a name=L302 href="source/kernel/chr_drv/serial.c?v=0.97#L302">302</a> static void <a href="ident?v=0.97;i=startup">startup</a>(unsigned short port)
<a name=L303 href="source/kernel/chr_drv/serial.c?v=0.97#L303">303</a> {
<a name=L304 href="source/kernel/chr_drv/serial.c?v=0.97#L304">304</a>         int i;
<a name=L305 href="source/kernel/chr_drv/serial.c?v=0.97#L305">305</a> 
<a name=L306 href="source/kernel/chr_drv/serial.c?v=0.97#L306">306</a>         <a href="ident?v=0.97;i=outb_p">outb_p</a>(0x03,port+3);    <b><i>/* reset DLAB */</i></b>
<a name=L307 href="source/kernel/chr_drv/serial.c?v=0.97#L307">307</a>         <a href="ident?v=0.97;i=outb_p">outb_p</a>(0x0b,port+4);    <b><i>/* set DTR,RTS, OUT_2 */</i></b>
<a name=L308 href="source/kernel/chr_drv/serial.c?v=0.97#L308">308</a>         <a href="ident?v=0.97;i=outb_p">outb_p</a>(0x0f,port+1);    <b><i>/* enable all intrs */</i></b>
<a name=L309 href="source/kernel/chr_drv/serial.c?v=0.97#L309">309</a>         <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+2);
<a name=L310 href="source/kernel/chr_drv/serial.c?v=0.97#L310">310</a>         <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+6);
<a name=L311 href="source/kernel/chr_drv/serial.c?v=0.97#L311">311</a>         <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+2);
<a name=L312 href="source/kernel/chr_drv/serial.c?v=0.97#L312">312</a>         <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+5);
<a name=L313 href="source/kernel/chr_drv/serial.c?v=0.97#L313">313</a>         for (i = 0; i &lt; 16 ; i++) {
<a name=L314 href="source/kernel/chr_drv/serial.c?v=0.97#L314">314</a>                 <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+0);
<a name=L315 href="source/kernel/chr_drv/serial.c?v=0.97#L315">315</a>                 if (!(<a href="ident?v=0.97;i=inb_p">inb_p</a>(port+5) &amp; 1))
<a name=L316 href="source/kernel/chr_drv/serial.c?v=0.97#L316">316</a>                         break;
<a name=L317 href="source/kernel/chr_drv/serial.c?v=0.97#L317">317</a>         }
<a name=L318 href="source/kernel/chr_drv/serial.c?v=0.97#L318">318</a>         <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+2);
<a name=L319 href="source/kernel/chr_drv/serial.c?v=0.97#L319">319</a>         <a href="ident?v=0.97;i=inb_p">inb_p</a>(port+5);
<a name=L320 href="source/kernel/chr_drv/serial.c?v=0.97#L320">320</a> }
<a name=L321 href="source/kernel/chr_drv/serial.c?v=0.97#L321">321</a> 
<a name=L322 href="source/kernel/chr_drv/serial.c?v=0.97#L322">322</a> void <a href="ident?v=0.97;i=change_speed">change_speed</a>(unsigned int line)
<a name=L323 href="source/kernel/chr_drv/serial.c?v=0.97#L323">323</a> {
<a name=L324 href="source/kernel/chr_drv/serial.c?v=0.97#L324">324</a>         struct <a href="ident?v=0.97;i=serial_struct">serial_struct</a> * <a href="ident?v=0.97;i=info">info</a>;
<a name=L325 href="source/kernel/chr_drv/serial.c?v=0.97#L325">325</a>         unsigned short port,quot;
<a name=L326 href="source/kernel/chr_drv/serial.c?v=0.97#L326">326</a>         unsigned cflag,cval;
<a name=L327 href="source/kernel/chr_drv/serial.c?v=0.97#L327">327</a>         static unsigned short quotient[] = {
<a name=L328 href="source/kernel/chr_drv/serial.c?v=0.97#L328">328</a>                 0, 2304, 1536, 1047, 857,
<a name=L329 href="source/kernel/chr_drv/serial.c?v=0.97#L329">329</a>                 768, 576, 384, 192, 96,
<a name=L330 href="source/kernel/chr_drv/serial.c?v=0.97#L330">330</a>                 64, 48, 24, 12, 6, 3
<a name=L331 href="source/kernel/chr_drv/serial.c?v=0.97#L331">331</a>         };
<a name=L332 href="source/kernel/chr_drv/serial.c?v=0.97#L332">332</a> 
<a name=L333 href="source/kernel/chr_drv/serial.c?v=0.97#L333">333</a>         if (line &gt;= <a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>)
<a name=L334 href="source/kernel/chr_drv/serial.c?v=0.97#L334">334</a>                 return;
<a name=L335 href="source/kernel/chr_drv/serial.c?v=0.97#L335">335</a>         <a href="ident?v=0.97;i=info">info</a> = <a href="ident?v=0.97;i=serial_table">serial_table</a> + line;
<a name=L336 href="source/kernel/chr_drv/serial.c?v=0.97#L336">336</a>         cflag = <a href="ident?v=0.97;i=info">info</a>-&gt;tty-&gt;<a href="ident?v=0.97;i=termios">termios</a>.c_cflag;
<a name=L337 href="source/kernel/chr_drv/serial.c?v=0.97#L337">337</a>         if (!(port = <a href="ident?v=0.97;i=info">info</a>-&gt;port))
<a name=L338 href="source/kernel/chr_drv/serial.c?v=0.97#L338">338</a>                 return;
<a name=L339 href="source/kernel/chr_drv/serial.c?v=0.97#L339">339</a>         quot = quotient[cflag &amp; <a href="ident?v=0.97;i=CBAUD">CBAUD</a>];
<a name=L340 href="source/kernel/chr_drv/serial.c?v=0.97#L340">340</a>         if (!quot)
<a name=L341 href="source/kernel/chr_drv/serial.c?v=0.97#L341">341</a>                 <a href="ident?v=0.97;i=outb">outb</a>(0x00,port+4);
<a name=L342 href="source/kernel/chr_drv/serial.c?v=0.97#L342">342</a>         else if (!<a href="ident?v=0.97;i=inb">inb</a>(port+4))
<a name=L343 href="source/kernel/chr_drv/serial.c?v=0.97#L343">343</a>                 <a href="ident?v=0.97;i=startup">startup</a>(port);
<a name=L344 href="source/kernel/chr_drv/serial.c?v=0.97#L344">344</a> <b><i>/* byte size and parity */</i></b>
<a name=L345 href="source/kernel/chr_drv/serial.c?v=0.97#L345">345</a>         cval = cflag &amp; (<a href="ident?v=0.97;i=CSIZE">CSIZE</a> | <a href="ident?v=0.97;i=CSTOPB">CSTOPB</a>);
<a name=L346 href="source/kernel/chr_drv/serial.c?v=0.97#L346">346</a>         cval &gt;&gt;= 4;
<a name=L347 href="source/kernel/chr_drv/serial.c?v=0.97#L347">347</a>         if (cflag &amp; <a href="ident?v=0.97;i=PARENB">PARENB</a>)
<a name=L348 href="source/kernel/chr_drv/serial.c?v=0.97#L348">348</a>                 cval |= 8;
<a name=L349 href="source/kernel/chr_drv/serial.c?v=0.97#L349">349</a>         if (!(cflag &amp; <a href="ident?v=0.97;i=PARODD">PARODD</a>))
<a name=L350 href="source/kernel/chr_drv/serial.c?v=0.97#L350">350</a>                 cval |= 16;
<a name=L351 href="source/kernel/chr_drv/serial.c?v=0.97#L351">351</a>         <a href="ident?v=0.97;i=cli">cli</a>();
<a name=L352 href="source/kernel/chr_drv/serial.c?v=0.97#L352">352</a>         <a href="ident?v=0.97;i=outb_p">outb_p</a>(cval | 0x80,port+3);     <b><i>/* set DLAB */</i></b>
<a name=L353 href="source/kernel/chr_drv/serial.c?v=0.97#L353">353</a>         <a href="ident?v=0.97;i=outb_p">outb_p</a>(quot &amp; 0xff,port);       <b><i>/* LS of divisor */</i></b>
<a name=L354 href="source/kernel/chr_drv/serial.c?v=0.97#L354">354</a>         <a href="ident?v=0.97;i=outb_p">outb_p</a>(quot &gt;&gt; 8,port+1);       <b><i>/* MS of divisor */</i></b>
<a name=L355 href="source/kernel/chr_drv/serial.c?v=0.97#L355">355</a>         <a href="ident?v=0.97;i=outb">outb</a>(cval,port+3);              <b><i>/* reset DLAB */</i></b>
<a name=L356 href="source/kernel/chr_drv/serial.c?v=0.97#L356">356</a>         <a href="ident?v=0.97;i=sti">sti</a>();
<a name=L357 href="source/kernel/chr_drv/serial.c?v=0.97#L357">357</a> }
<a name=L358 href="source/kernel/chr_drv/serial.c?v=0.97#L358">358</a> 
<a name=L359 href="source/kernel/chr_drv/serial.c?v=0.97#L359">359</a> static void (*<a href="ident?v=0.97;i=serial_handler">serial_handler</a>[<a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>])(int) = {
<a name=L360 href="source/kernel/chr_drv/serial.c?v=0.97#L360">360</a>         <a href="ident?v=0.97;i=com1_IRQ">com1_IRQ</a>,<a href="ident?v=0.97;i=com2_IRQ">com2_IRQ</a>,<a href="ident?v=0.97;i=com3_IRQ">com3_IRQ</a>,<a href="ident?v=0.97;i=com4_IRQ">com4_IRQ</a>
<a name=L361 href="source/kernel/chr_drv/serial.c?v=0.97#L361">361</a> };
<a name=L362 href="source/kernel/chr_drv/serial.c?v=0.97#L362">362</a> 
<a name=L363 href="source/kernel/chr_drv/serial.c?v=0.97#L363">363</a> <b><i>/*</i></b>
<a name=L364 href="source/kernel/chr_drv/serial.c?v=0.97#L364">364</a> <b><i> * this routine enables interrupts on 'line', and disables them for any</i></b>
<a name=L365 href="source/kernel/chr_drv/serial.c?v=0.97#L365">365</a> <b><i> * other serial line that shared the same IRQ. Braindamaged AT hardware.</i></b>
<a name=L366 href="source/kernel/chr_drv/serial.c?v=0.97#L366">366</a> <b><i> */</i></b>
<a name=L367 href="source/kernel/chr_drv/serial.c?v=0.97#L367">367</a> int <a href="ident?v=0.97;i=serial_open">serial_open</a>(unsigned line, struct <a href="ident?v=0.97;i=file">file</a> * filp)
<a name=L368 href="source/kernel/chr_drv/serial.c?v=0.97#L368">368</a> {
<a name=L369 href="source/kernel/chr_drv/serial.c?v=0.97#L369">369</a>         struct <a href="ident?v=0.97;i=serial_struct">serial_struct</a> * <a href="ident?v=0.97;i=info">info</a>;
<a name=L370 href="source/kernel/chr_drv/serial.c?v=0.97#L370">370</a>         int irq,retval;
<a name=L371 href="source/kernel/chr_drv/serial.c?v=0.97#L371">371</a>         unsigned short port;
<a name=L372 href="source/kernel/chr_drv/serial.c?v=0.97#L372">372</a>         struct <a href="ident?v=0.97;i=sigaction">sigaction</a> sa;
<a name=L373 href="source/kernel/chr_drv/serial.c?v=0.97#L373">373</a> 
<a name=L374 href="source/kernel/chr_drv/serial.c?v=0.97#L374">374</a>         sa.sa_handler = <a href="ident?v=0.97;i=serial_handler">serial_handler</a>[line];
<a name=L375 href="source/kernel/chr_drv/serial.c?v=0.97#L375">375</a>         sa.sa_flags = <a href="ident?v=0.97;i=SA_INTERRUPT">SA_INTERRUPT</a>;
<a name=L376 href="source/kernel/chr_drv/serial.c?v=0.97#L376">376</a>         sa.sa_mask = 0;
<a name=L377 href="source/kernel/chr_drv/serial.c?v=0.97#L377">377</a>         sa.sa_restorer = <a href="ident?v=0.97;i=NULL">NULL</a>;
<a name=L378 href="source/kernel/chr_drv/serial.c?v=0.97#L378">378</a>         if (line &gt;= <a href="ident?v=0.97;i=NR_SERIALS">NR_SERIALS</a>)
<a name=L379 href="source/kernel/chr_drv/serial.c?v=0.97#L379">379</a>                 return -<a href="ident?v=0.97;i=ENODEV">ENODEV</a>;
<a name=L380 href="source/kernel/chr_drv/serial.c?v=0.97#L380">380</a>         <a href="ident?v=0.97;i=info">info</a> = <a href="ident?v=0.97;i=serial_table">serial_table</a> + line;
<a name=L381 href="source/kernel/chr_drv/serial.c?v=0.97#L381">381</a>         if (!(port = <a href="ident?v=0.97;i=info">info</a>-&gt;port))
<a name=L382 href="source/kernel/chr_drv/serial.c?v=0.97#L382">382</a>                 return -<a href="ident?v=0.97;i=ENODEV">ENODEV</a>;
<a name=L383 href="source/kernel/chr_drv/serial.c?v=0.97#L383">383</a>         irq = <a href="ident?v=0.97;i=info">info</a>-&gt;irq;
<a name=L384 href="source/kernel/chr_drv/serial.c?v=0.97#L384">384</a>         if (irq == 2)
<a name=L385 href="source/kernel/chr_drv/serial.c?v=0.97#L385">385</a>                 irq = 9;
<a name=L386 href="source/kernel/chr_drv/serial.c?v=0.97#L386">386</a>         if (retval = <a href="ident?v=0.97;i=irqaction">irqaction</a>(irq,&amp;sa))