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采用ark 3116芯片组的usb转rs232接口线的linux下驱动程序

ark3116 usb2serial linux driver
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first of all thanks to krisfx for his code!

this driver is _very_ experimental !

ioctl calls are IGNORED !

tested:
- all baudrates work (150-230400baud), 75 & 460800 should now work, too
- 8N1,7N1 & 6N1 seem to work (tested with an atmel atmega8 microcontroller)

-> stopbit & parity untested !




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SOME OBSERVATIONS:
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ark3116 protocol:
(abaud = 3000000/baudrate)

--- set baudrate:
 reg(0x0003) <= 0x0083 (sometimes 82 ?!)
 reg(0x0000) <= lo(abaud)
 reg(0x0001) <= hi(abaud)
 reg(0x0003) <= 0x0003

--- read modem control signals:
 val <= reg(0x0006) -> bit4+bit6 change if pulling controls low

--- maybe write modem control signals:
 reg(0x0004) <= ?!? just an idea... not tested yet

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registers:
0x0000 - baud lo byte
0x0001 - baud hi byte
0x0002 - <seems like not used...>
0x0003 - some kind of bank switch or write enable (0x83) ? or maybe this is control line setting ?!
0x0004 - ?? maybe set control signals ?
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i dont understand why the init does something like this:
 ARK3116_SND(41,0xFE,0x40,0x0001,0x0004);
 ARK3116_RCV(42,0xFE,0xC0,0x0000,0x0004, 0x01);
 ARK3116_SND(43,0xFE,0x40,0x0003,0x0004);
 ARK3116_RCV(45,0xFE,0xC0,0x0000,0x0004, 0x03);
 ARK3116_SND(46,0xFE,0x40,0x0002,0x0004);
 ARK3116_RCV(47,0xFE,0xC0,0x0000,0x0004, 0x02);
 ARK3116_SND(48,0xFE,0x40,0x0000,0x0004);
 ARK3116_RCV(50,0xFE,0xC0,0x0000,0x0004, 0x00);
 ...

 this is what the original driver does... i have no idea
 what this does ?! maybe the driver is setting/clearing rts/dtr
 or something ?! i dont know... but write to 0x0004 might
 be setting of control signals... -> need to check this ;)
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contact me: [e-mail]

LICENSE: GPL