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tty: Update serial core API documentation

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Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kevin Cernekee 2012-12-26 20:43:42 -08:00 committed by Greg Kroah-Hartman
parent ef4f527c48
commit e759d7c53b
2 changed files with 43 additions and 4 deletions
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39
Documentation/serial/driver
View File

@ -133,6 +133,16 @@ hardware.
Interrupts: locally disabled.
This call must not sleep
send_xchar(port,ch)
Transmit a high priority character, even if the port is stopped.
This is used to implement XON/XOFF flow control and tcflow(). If
the serial driver does not implement this function, the tty core
will append the character to the circular buffer and then call
start_tx() / stop_tx() to flush the data out.
Locking: none.
Interrupts: caller dependent.
stop_rx(port)
Stop receiving characters; the port is in the process of
being closed.
@ -254,6 +264,10 @@ hardware.
Locking: none.
Interrupts: caller dependent.
set_wake(port,state)
Enable/disable power management wakeup on serial activity. Not
currently implemented.
type(port)
Return a pointer to a string constant describing the specified
port, or return NULL, in which case the string 'unknown' is
@ -306,6 +320,31 @@ hardware.
Locking: none.
Interrupts: caller dependent.
poll_init(port)
Called by kgdb to perform the minimal hardware initialization needed
to support poll_put_char() and poll_get_char(). Unlike ->startup()
this should not request interrupts.
Locking: tty_mutex and tty_port->mutex taken.
Interrupts: n/a.
poll_put_char(port,ch)
Called by kgdb to write a single character directly to the serial
port. It can and should block until there is space in the TX FIFO.
Locking: none.
Interrupts: caller dependent.
This call must not sleep
poll_get_char(port)
Called by kgdb to read a single character directly from the serial
port. If data is available, it should be returned; otherwise
the function should return NO_POLL_CHAR immediately.
Locking: none.
Interrupts: caller dependent.
This call must not sleep
Other functions
---------------

8
include/linux/serial_core.h
View File

@ -37,8 +37,8 @@ struct serial_struct;
struct device;
/*
* This structure describes all the operations that can be
* done on the physical hardware.
* This structure describes all the operations that can be done on the
* physical hardware. See Documentation/serial/driver for details.
*/
struct uart_ops {
unsigned int (*tx_empty)(struct uart_port *);
@ -65,7 +65,7 @@ struct uart_ops {
/*
* Return a string describing the type of the port
*/
const char *(*type)(struct uart_port *);
const char *(*type)(struct uart_port *);
/*
* Release IO and memory resources used by the port.
@ -83,7 +83,7 @@ struct uart_ops {
int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
#ifdef CONFIG_CONSOLE_POLL
int (*poll_init)(struct uart_port *);
void (*poll_put_char)(struct uart_port *, unsigned char);
void (*poll_put_char)(struct uart_port *, unsigned char);
int (*poll_get_char)(struct uart_port *);
#endif
};