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| author |   Okash Khawaja <okash.khawaja@gmail.com> | 2017-05-15 18:45:37 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-16 14:19:41 +0200 |
| commit | 1c5973675cee92d5e8ad3a8a6e53a3e822bae271 (patch) | |
| tree | 2ef5bad2d418ac675b709e600b8bf6975e565fda /drivers/staging/speakup/serialio.c | |
| parent | staging: speakup: migrate apollo, ltlk, audptr, decext, dectlk and spkout (diff) | |
| download | linux-dev-1c5973675cee92d5e8ad3a8a6e53a3e822bae271.tar.xz linux-dev-1c5973675cee92d5e8ad3a8a6e53a3e822bae271.zip | |
staging: speakup: flush tty buffers and ensure hardware flow control
This patch fixes the issue where TTY-migrated synths would take a while
to shut up after hitting numpad enter key. When calling synth_flush,
even though XOFF character is sent as high priority, data buffered in
TTY layer is still sent to the synth. This patch flushes that buffered
data when synth_flush is called.
It also tries to ensure that hardware flow control is enabled, by
setting CRTSCTS using tty's termios.
Reported-by: John Covici <covici@ccs.covici.com>
Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/speakup/serialio.c')
| -rw-r--r-- | drivers/staging/speakup/serialio.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/staging/speakup/serialio.c b/drivers/staging/speakup/serialio.c index 5f96b5ba7acb..969373201356 100644 --- a/drivers/staging/speakup/serialio.c +++ b/drivers/staging/speakup/serialio.c @@ -30,6 +30,7 @@ static void spk_serial_send_xchar(char ch); static void spk_serial_tiocmset(unsigned int set, unsigned int clear); static unsigned char spk_serial_in(void); static unsigned char spk_serial_in_nowait(void); +static void spk_serial_flush_buffer(void); struct spk_io_ops spk_serial_io_ops = { .synth_out = spk_serial_out, @@ -37,6 +38,7 @@ struct spk_io_ops spk_serial_io_ops = { .tiocmset = spk_serial_tiocmset, .synth_in = spk_serial_in, .synth_in_nowait = spk_serial_in_nowait, + .flush_buffer = spk_serial_flush_buffer, }; EXPORT_SYMBOL_GPL(spk_serial_io_ops); @@ -268,6 +270,11 @@ static unsigned char spk_serial_in_nowait(void) return inb_p(speakup_info.port_tts + UART_RX); } +static void spk_serial_flush_buffer(void) +{ + /* TODO: flush the UART 16550 buffer */ +} + static int spk_serial_out(struct spk_synth *in_synth, const char ch) { if (in_synth->alive && spk_wait_for_xmitr(in_synth)) { |