1PARPORT_READ(9)              Parallel Port Devices             PARPORT_READ(9)
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NAME

6       parport_read - read a block of data from a parallel port
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SYNOPSIS

9       ssize_t parport_read(struct parport * port, void * buffer, size_t len);
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ARGUMENTS

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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DESCRIPTION

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 caller´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)
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