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[patch 0/7] staging: speakup: introduce tty-based comms

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Hi,

This patchset introduces a TTY-based way for the synths to communicate
with devices as an alternate for direct serial comms used by the synths
at the moment. It then migrates some of the synths to the TTY-based
comms. Synths migrated in this patchset are dummy, acntsa, bns and
txprt.

As such, this series is meant to start a discussion on the changes in the
first patch: "tty_port: allow a port to be opened with a tty that has no
file handle". This allows speakup to access tty port early on during boot,
making it possible to start emiting messages as early as possible. This is
demonstrated in patch 6, where it calls tty_open_by_driver, passing in NULL
for inode and filp params.

To wrap up, here is a summary of the patches that follow. Patch 1 enables
kernel access to TTY device. Patches 2 - 5 prepare the code to accomodate
TTY-based comms as an alternate to raw serial I/O for outputting data to
external device. Patch 6 builds upon the changes made in patch 1 and utilises
TTY-subsystem to communicate with external device - currently just over ttyS*
but with plans to expand it to other TTY devices soon. Finally, patch 7 does
actual migration of some of the simple synths from raw serial comms to TTY.

Okash

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[patch 0/7] staging: speakup: introduce tty-based comms okash.khawaja@gmail.com - 2017-03-13 23:10 +0100
  Re: [patch 0/7] staging: speakup: introduce tty-based comms Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-13 23:20 +0100
    Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-13 23:30 +0100
      Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-14 00:50 +0100
      Re: [patch 0/7] staging: speakup: introduce tty-based comms Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-14 00:50 +0100
      Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-14 01:10 +0100
    Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-14 01:50 +0100
      Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-14 02:20 +0100
        Re: [patch 0/7] staging: speakup: introduce tty-based comms Rob Herring <robh@kernel.org> - 2017-03-15 15:50 +0100
          Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-15 16:10 +0100
            Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-22 01:10 +0100
      Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-16 10:30 +0100
  Re: [patch 1/7] tty_port: allow a port to be opened with a tty that  has no file handle Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-13 23:20 +0100
    Re: [patch 1/7] tty_port: allow a port to be opened with a tty that  has no file handle Okash Khawaja <okash.khawaja@gmail.com> - 2017-03-13 23:40 +0100
  [patch 6/7] staging: speakup: add tty-based comms functions okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
  [patch 3/7] staging: serial: add spk_io_ops struct to spk_synth okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
  [patch 4/7] staging: speakup: move spk_stop_serial_interrupt into synth-specific release function okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
  [patch 7/7] staging: speakup: migrate acntsa, bns, dummy and txprt to ttyio okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
  [patch 2/7] staging: speakup: spk_serial_out and spk_wait_for_xmitr to take synth arg okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
  [patch 1/7] tty_port: allow a port to be opened with a tty that has no file handle okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
    Re: [patch 1/7] tty_port: allow a port to be opened with a tty that  has no file handle Dan Carpenter <dan.carpenter@oracle.com> - 2017-03-14 10:20 +0100
  [patch 5/7] staging: speakup: move those functions which do outgoing serial comms, into serialio.c okash.khawaja@gmail.com - 2017-03-13 23:20 +0100
  Re: [patch 0/7] staging: speakup: introduce tty-based comms Samuel Thibault <samuel.thibault@ens-lyon.org> - 2017-03-14 01:30 +0100

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