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| author | Matwey V. Kornilov <matwey@sai.msu.ru> | 2016-02-01 21:09:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-07 09:23:26 +0300 |
| commit | e490c9144cfaa8e2242c1e5d5187230928f27417 (patch) | |
| tree | 183cac3bb0d61e0637045d9973e628bd98d9009f /drivers/tty/serial/8250/8250.h | |
| parent | a07a70bcb72e4a766c8d3173986a773cef842d30 (diff) | |
| download | linux-e490c9144cfaa8e2242c1e5d5187230928f27417.tar.xz | |
tty: Add software emulated RS485 support for 8250
Implementation of software emulation of RS485 direction handling is based
on omap_serial driver.
Before and after transmission RTS is set to the appropriate value.
Note that before calling serial8250_em485_init() the caller has to
ensure that UART will interrupt when shift register empty. Otherwise,
emultaion cannot be used.
Both serial8250_em485_init() and serial8250_em485_destroy() are
idempotent functions.
Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250.h')
| -rw-r--r-- | drivers/tty/serial/8250/8250.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index d54dcd87c67e..ce587c03efc3 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -117,6 +117,8 @@ static inline void serial_dl_write(struct uart_8250_port *up, int value) struct uart_8250_port *serial8250_get_port(int line); void serial8250_rpm_get(struct uart_8250_port *p); void serial8250_rpm_put(struct uart_8250_port *p); +int serial8250_em485_init(struct uart_8250_port *p); +void serial8250_em485_destroy(struct uart_8250_port *p); #if defined(__alpha__) && !defined(CONFIG_PCI) /* |