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serial: Consolidate BOTH_EMPTY use

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Per file BOTH_EMPTY defines are littering our source code here and
there. Define once in serial.h and create helper for the check
too.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220624205424.12686-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen
2022-06-24 23:54:24 +03:00
committed by Greg Kroah-Hartman
parent eb47b59afb
commit 34619de1b8
10 changed files with 31 additions and 33 deletions
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9
include/linux/serial.h
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@@ -10,10 +10,19 @@
#define _LINUX_SERIAL_H
#include <uapi/linux/serial.h>
#include <uapi/linux/serial_reg.h>
/* Helper for dealing with UART_LCR_WLEN* defines */
#define UART_LCR_WLEN(x) ((x) - 5)
/* FIFO and shifting register empty */
#define UART_LSR_BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
static inline bool uart_lsr_tx_empty(u16 lsr)
{
return (lsr & UART_LSR_BOTH_EMPTY) == UART_LSR_BOTH_EMPTY;
}
/*
* Counters of the input lines (CTS, DSR, RI, CD) interrupts
*/