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console: add console unregistering 

Some console are transient, like the USB connected serial
console which should be removed when the USB connection is
severed.

Enable console removal for such devices.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Robert Jarzmik 2011-11-24 04:01:26 +01:00 committed by Sascha Hauer
parent 2504dcd332
commit ea8314d19f
3 changed files with 23 additions and 6 deletions
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24
common/console.c
View File

@ -154,13 +154,9 @@ int console_register(struct console_device *newcdev)
list_add_tail(&newcdev->list, &console_list);
if (console_output_buffer) {
while (kfifo_getc(console_output_buffer, &ch) == 0)
console_putc(CONSOLE_STDOUT, ch);
kfifo_free(console_output_buffer);
console_output_buffer = NULL;
}
while (kfifo_getc(console_output_buffer, &ch) == 0)
console_putc(CONSOLE_STDOUT, ch);
if (first)
barebox_banner();
@ -168,6 +164,22 @@ int console_register(struct console_device *newcdev)
}
EXPORT_SYMBOL(console_register);
int console_unregister(struct console_device *cdev)
{
struct device_d *dev = &cdev->class_dev;
int status;
list_del(&cdev->list);
if (list_empty(&console_list))
initialized = CONSOLE_UNINITIALIZED;
status = unregister_device(dev);
if (!status)
memset(cdev, 0, sizeof(*cdev));
return status;
}
EXPORT_SYMBOL(console_unregister);
static int getc_raw(void)
{
struct console_device *cdev;

4
common/console_simple.c
View File

@ -157,3 +157,7 @@ int console_register(struct console_device *newcdev)
}
return 0;
}
int console_unregister(struct console_device *cdev)
{
}

1
include/console.h
View File

@ -49,6 +49,7 @@ struct console_device {
};
int console_register(struct console_device *cdev);
int console_unregister(struct console_device *cdev);
extern struct list_head console_list;
#define for_each_console(console) list_for_each_entry(console, &console_list, list)