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serial: Allow more than one serial device to be registered

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This commit is contained in:
Aaron Lindsay 2012-10-07 10:28:33 -04:00
parent 828beb45bd
commit 0b7e14c69b
2 changed files with 13 additions and 5 deletions
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15
drivers/serial.c
View File

@ -21,16 +21,21 @@
#include <init.h> #include <init.h>
#include <drivers/serial.h> #include <drivers/serial.h>
struct serial_dev *first_serial_dev; struct dlist_node serial_dev_list;
int serial_register_device(struct serial_dev *sdev) { int serial_register_device(struct serial_dev *sdev) {
if (!first_serial_dev) if (!sdev)
first_serial_dev = sdev; return -1;
insert_before(&serial_dev_list, &sdev->list);
return 0; return 0;
} }
struct serial_dev *serial_first_device() { struct serial_dev *serial_first_device() {
return first_serial_dev; if (list_empty(&serial_dev_list))
return 0;
return container(serial_dev_list.next, struct serial_dev, list);
} }
/* /*
@ -40,5 +45,5 @@ struct serial_dev *serial_first_device() {
* initialized in earlyinitcalls. * initialized in earlyinitcalls.
*/ */
void serial_init() { void serial_init() {
first_serial_dev = 0; init_list(&serial_dev_list);
} }

3
include/drivers/serial.h
View File

@ -18,9 +18,12 @@
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/ */
#include <list.h>
struct serial_dev { struct serial_dev {
//TODO add more functions and attributes here //TODO add more functions and attributes here
int (*putc)(char); int (*putc)(char);
struct dlist_node list;
}; };
int serial_register_device(struct serial_dev *sdev); int serial_register_device(struct serial_dev *sdev);