1PARPORT_READ(9) Parallel Port Devices PARPORT_READ(9)
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6 parport_read - read a block of data from a parallel port
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9 ssize_t parport_read(struct parport * port, void * buffer, size_t len);
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12 port
13 port to read from
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15 buffer
16 data buffer (in kernel space)
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18 len
19 number of bytes of data to transfer
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22 This will read up to len bytes of buffer to the port specified, using
23 the IEEE 1284 transfer mode most recently negotiated to (using
24 parport_negotiate), as long as that mode supports reverse transfers
25 (peripheral to host).
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27 It is the callerĀ“s responsibility to ensure that the first len bytes of
28 buffer are available to write to.
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30 This function returns the number of bytes transferred (if zero or
31 positive), or else an error code.
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34Kernel Hackers Manual 2.6. June 2019 PARPORT_READ(9)