Split the dbc tty driver registrations function into separate
init and probe parts.
The init part will register the tty driver, and should in the future be
called from module_init().
The probe part will become the normal probe function, but for now it is
called from the init part.
The unregister function is s likewise split into remove and exit parts.
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-dbgcap.c | 6 +-
drivers/usb/host/xhci-dbgcap.h | 4 +-
drivers/usb/host/xhci-dbgtty.c | 125 ++++++++++++++++++++-------------
3 files changed, 81 insertions(+), 54 deletions(-)
diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index e3eec628edb5..99f0b425274a 100644
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -1032,7 +1032,7 @@ int xhci_dbc_init(struct xhci_hcd *xhci)
if (ret)
goto init_err3;
- ret = xhci_dbc_tty_register_driver(xhci);
+ ret = xhci_dbc_tty_probe(xhci);
if (ret)
goto init_err2;
@@ -1043,7 +1043,7 @@ int xhci_dbc_init(struct xhci_hcd *xhci)
return 0;
init_err1:
- xhci_dbc_tty_unregister_driver();
+ xhci_dbc_tty_remove(xhci->dbc);
init_err2:
xhci_do_dbc_exit(xhci);
init_err3:
@@ -1058,7 +1058,7 @@ void xhci_dbc_exit(struct xhci_hcd *xhci)
return;
device_remove_file(dev, &dev_attr_dbc);
- xhci_dbc_tty_unregister_driver();
+ xhci_dbc_tty_remove(xhci->dbc);
xhci_dbc_stop(xhci->dbc);
xhci_do_dbc_exit(xhci);
}
diff --git a/drivers/usb/host/xhci-dbgcap.h b/drivers/usb/host/xhci-dbgcap.h
index 796cf2808be8..e4c7c9279ea8 100644
--- a/drivers/usb/host/xhci-dbgcap.h
+++ b/drivers/usb/host/xhci-dbgcap.h
@@ -190,8 +190,8 @@ static inline struct dbc_ep *get_out_ep(struct xhci_dbc *dbc)
#ifdef CONFIG_USB_XHCI_DBGCAP
int xhci_dbc_init(struct xhci_hcd *xhci);
void xhci_dbc_exit(struct xhci_hcd *xhci);
-int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci);
-void xhci_dbc_tty_unregister_driver(void);
+int xhci_dbc_tty_probe(struct xhci_hcd *xhci);
+void xhci_dbc_tty_remove(struct xhci_dbc *dbc);
int xhci_dbc_tty_register_device(struct xhci_dbc *dbc);
void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc);
struct dbc_request *dbc_alloc_request(struct xhci_dbc *dbc,
diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c
index ab2b82aa04be..9acf1efba36c 100644
--- a/drivers/usb/host/xhci-dbgtty.c
+++ b/drivers/usb/host/xhci-dbgtty.c
@@ -14,6 +14,11 @@
#include "xhci.h"
#include "xhci-dbgcap.h"
+static int dbc_tty_init(void);
+static void dbc_tty_exit(void);
+
+static struct tty_driver *dbc_tty_driver;
+
static unsigned int
dbc_send_packet(struct dbc_port *port, char *packet, unsigned int size)
{
@@ -278,55 +283,6 @@ static const struct tty_operations dbc_tty_ops = {
.unthrottle = dbc_tty_unthrottle,
};
-static struct tty_driver *dbc_tty_driver;
-
-int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci)
-{
- int status;
- struct xhci_dbc *dbc = xhci->dbc;
-
- dbc_tty_driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW |
- TTY_DRIVER_DYNAMIC_DEV);
- if (IS_ERR(dbc_tty_driver)) {
- status = PTR_ERR(dbc_tty_driver);
- dbc_tty_driver = NULL;
- return status;
- }
-
- dbc_tty_driver->driver_name = "dbc_serial";
- dbc_tty_driver->name = "ttyDBC";
-
- dbc_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
- dbc_tty_driver->subtype = SERIAL_TYPE_NORMAL;
- dbc_tty_driver->init_termios = tty_std_termios;
- dbc_tty_driver->init_termios.c_cflag =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- dbc_tty_driver->init_termios.c_ispeed = 9600;
- dbc_tty_driver->init_termios.c_ospeed = 9600;
- dbc_tty_driver->driver_state = &dbc->port;
-
- tty_set_operations(dbc_tty_driver, &dbc_tty_ops);
-
- status = tty_register_driver(dbc_tty_driver);
- if (status) {
- xhci_err(xhci,
- "can't register dbc tty driver, err %d\n", status);
- put_tty_driver(dbc_tty_driver);
- dbc_tty_driver = NULL;
- }
-
- return status;
-}
-
-void xhci_dbc_tty_unregister_driver(void)
-{
- if (dbc_tty_driver) {
- tty_unregister_driver(dbc_tty_driver);
- put_tty_driver(dbc_tty_driver);
- dbc_tty_driver = NULL;
- }
-}
-
static void dbc_rx_push(unsigned long _port)
{
struct dbc_request *req;
@@ -498,3 +454,74 @@ void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
xhci_dbc_free_requests(&port->read_queue);
xhci_dbc_free_requests(&port->write_pool);
}
+
+int xhci_dbc_tty_probe(struct xhci_hcd *xhci)
+{
+ struct xhci_dbc *dbc = xhci->dbc;
+ int status;
+
+ /* dbc_tty_init will be called by module init() in the future */
+ status = dbc_tty_init();
+ if (status)
+ return status;
+
+ dbc_tty_driver->driver_state = &dbc->port;
+
+ return 0;
+out:
+
+ /* dbc_tty_exit will be called by module_exit() in the future */
+ dbc_tty_exit();
+ return status;
+}
+
+/*
+ * undo what probe did, assume dbc is stopped already.
+ * we also assume tty_unregister_device() is called before this
+ */
+void xhci_dbc_tty_remove(struct xhci_dbc *dbc)
+{
+ /* dbc_tty_exit will be called by module_exit() in the future */
+ dbc_tty_exit();
+}
+
+static int dbc_tty_init(void)
+{
+ int ret;
+
+ dbc_tty_driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV);
+ if (IS_ERR(dbc_tty_driver))
+ return PTR_ERR(dbc_tty_driver);
+
+ dbc_tty_driver->driver_name = "dbc_serial";
+ dbc_tty_driver->name = "ttyDBC";
+
+ dbc_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ dbc_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+ dbc_tty_driver->init_termios = tty_std_termios;
+ dbc_tty_driver->init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ dbc_tty_driver->init_termios.c_ispeed = 9600;
+ dbc_tty_driver->init_termios.c_ospeed = 9600;
+
+ tty_set_operations(dbc_tty_driver, &dbc_tty_ops);
+
+ ret = tty_register_driver(dbc_tty_driver);
+ if (ret) {
+ pr_err("Can't register dbc tty driver\n");
+ put_tty_driver(dbc_tty_driver);
+ }
+ return ret;
+}
+
+static void dbc_tty_exit(void)
+{
+ if (dbc_tty_driver) {
+ tty_unregister_driver(dbc_tty_driver);
+ put_tty_driver(dbc_tty_driver);
+ dbc_tty_driver = NULL;
+ }
+}
+
+
--
2.17.1
