Add power management function to tty driver interface
and add implementation for serial core.
Signed-off-by: Rickard Andersson <rickard.andersson@xxxxxxxxxxxxxx>
---
ChangeLog v1->v2
- add mutex handling
---
drivers/tty/serial/serial_core.c | 13 +++++++++++++
include/linux/tty_driver.h | 8 ++++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b2fc8d7..ec501f5 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1114,6 +1114,18 @@ static int uart_get_icount(struct tty_struct *tty,
return 0;
}
+static int uart_pm(struct tty_struct *tty, enum tty_pm_state state)
+{
+ struct uart_state *ustate = tty->driver_data;
+ struct tty_port *port = &ustate->port;
+
+ mutex_lock(&port->mutex);
+ uart_change_pm(ustate, state);
+ mutex_unlock(&port->mutex);
+
+ return 0;
+}
+
/*
* Called via sys_ioctl. We can use spin_lock_irq() here.
*/
@@ -2217,6 +2229,7 @@ static const struct tty_operations uart_ops = {
.tiocmget = uart_tiocmget,
.tiocmset = uart_tiocmset,
.get_icount = uart_get_icount,
+ .pm = uart_pm,
#ifdef CONFIG_CONSOLE_POLL
.poll_init = uart_poll_init,
.poll_get_char = uart_poll_get_char,
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index d150a6f..ba34b7f 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -229,6 +229,12 @@
* Called when the device receives a TIOCGICOUNT ioctl. Passed a kernel
* structure to complete. This method is optional and will only be called
* if provided (otherwise EINVAL will be returned).
+ *
+ * int (*pm)(struct tty_struct * tty, enum tty_pm_state state);
+ *
+ * Perform any power management related activities on the specified
+ * tty. State indicates the new state.
+ *
*/
#include <linux/export.h>
@@ -249,6 +255,7 @@ struct serial_icounter_struct;
*/
enum tty_pm_state {
TTY_PM_STATE_ON = 0,
+ TTY_PM_STATE_SLEEP,
TTY_PM_STATE_OFF = 3, /* number taken from ACPI */
TTY_PM_STATE_UNDEFINED,
};
@@ -290,6 +297,7 @@ struct tty_operations {
int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);
int (*get_icount)(struct tty_struct *tty,
struct serial_icounter_struct *icount);
+ int (*pm)(struct tty_struct *tty, enum tty_pm_state state);
#ifdef CONFIG_CONSOLE_POLL
int (*poll_init)(struct tty_driver *driver, int line, char *options);
int (*poll_get_char)(struct tty_driver *driver, int line);
--
1.8.0
--
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