Change DbC TTY driver to use the new modular interface exposed by the DbC
core. This will allow other function drivers with a different interface
also to use DbC.
[no need to add running number to tty driver name, remove it. -Mathias]
Signed-off-by: Rajaram Regupathy <rajaram.regupathy@xxxxxxxxx>
Signed-off-by: Abhilash K V <abhilash.k.v@xxxxxxxxx>
Signed-off-by: Prabhat Chand Pandey <prabhat.chand.pandey@xxxxxxxxx>
Acked-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
---
drivers/usb/host/Kconfig | 15 ++++++-
drivers/usb/host/Makefile | 4 +-
drivers/usb/host/xhci-dbgcap.h | 4 --
drivers/usb/host/xhci-dbgtty.c | 81 ++++++++++++++++++++++++++++++----
4 files changed, 90 insertions(+), 14 deletions(-)
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index d809671c5fea..c29ed8a61dcb 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -30,13 +30,26 @@ config USB_XHCI_HCD
if USB_XHCI_HCD
config USB_XHCI_DBGCAP
bool "xHCI support for debug capability"
- depends on TTY
---help---
Say 'Y' to enable the support for the xHCI debug capability. Make
sure that your xHCI host supports the extended debug capability and
you want a TTY serial device based on the xHCI debug capability
before enabling this option. If unsure, say 'N'.
+choice
+ prompt "Select function for debug capability"
+ depends on USB_XHCI_DBGCAP
+
+config USB_XHCI_DBGCAP_TTY
+ tristate "xHCI DbC tty driver support"
+ depends on USB_XHCI_HCD && USB_XHCI_DBGCAP && TTY
+ help
+ Say 'Y' to enable the support for the tty driver interface to xHCI
+ debug capability. This will expose a /dev/ttyDBC* device node on device
+ which may be used by the usb-debug driver on the debug host.
+ If unsure, say 'N'.
+endchoice
+
config USB_XHCI_PCI
tristate
depends on USB_PCI
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 84514f71ae44..b21b0ea9e966 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -16,9 +16,11 @@ xhci-hcd-y += xhci-ring.o xhci-hub.o xhci-dbg.o
xhci-hcd-y += xhci-trace.o
ifneq ($(CONFIG_USB_XHCI_DBGCAP), )
- xhci-hcd-y += xhci-dbgcap.o xhci-dbgtty.o
+ xhci-hcd-y += xhci-dbgcap.o
endif
+obj-$(CONFIG_USB_XHCI_DBGCAP_TTY) += xhci-dbgtty.o
+
ifneq ($(CONFIG_USB_XHCI_MTK), )
xhci-hcd-y += xhci-mtk-sch.o
endif
diff --git a/drivers/usb/host/xhci-dbgcap.h b/drivers/usb/host/xhci-dbgcap.h
index b4d5622a9030..302e6ca72370 100644
--- a/drivers/usb/host/xhci-dbgcap.h
+++ b/drivers/usb/host/xhci-dbgcap.h
@@ -218,10 +218,6 @@ static inline struct dbc_ep *get_out_ep(struct xhci_hcd *xhci)
#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_register_device(struct xhci_hcd *xhci);
-void xhci_dbc_tty_unregister_device(struct xhci_hcd *xhci);
struct dbc_request *dbc_alloc_request(struct dbc_ep *dep, gfp_t gfp_flags);
void xhci_dbc_flush_reqests(struct xhci_dbc *dbc);
void dbc_free_request(struct dbc_ep *dep, struct dbc_request *req);
diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c
index aff79ff5aba4..f75a95006c51 100644
--- a/drivers/usb/host/xhci-dbgtty.c
+++ b/drivers/usb/host/xhci-dbgtty.c
@@ -7,13 +7,15 @@
* Author: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
*/
+#include <linux/module.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
-
#include "xhci.h"
#include "xhci-dbgcap.h"
+#define DBC_STR_FUNC_TTY "TTY"
+
static unsigned int
dbc_send_packet(struct dbc_port *port, char *packet, unsigned int size)
{
@@ -279,12 +281,11 @@ 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)
+static int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci)
{
int status;
struct xhci_dbc *dbc = xhci->dbc;
+ struct tty_driver *dbc_tty_driver;
dbc_tty_driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV);
@@ -296,7 +297,6 @@ int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci)
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;
@@ -315,16 +315,19 @@ int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci)
put_tty_driver(dbc_tty_driver);
dbc_tty_driver = NULL;
}
+ dbc->func_priv = dbc_tty_driver;
return status;
}
-void xhci_dbc_tty_unregister_driver(void)
+static void xhci_dbc_tty_unregister_driver(struct xhci_dbc *dbc)
{
+ struct tty_driver *dbc_tty_driver =
+ (struct tty_driver *) dbc->func_priv;
if (dbc_tty_driver) {
tty_unregister_driver(dbc_tty_driver);
put_tty_driver(dbc_tty_driver);
- dbc_tty_driver = NULL;
+ dbc->func_priv = NULL;
}
}
@@ -440,12 +443,14 @@ xhci_dbc_tty_exit_port(struct dbc_port *port)
tty_port_destroy(&port->port);
}
-int xhci_dbc_tty_register_device(struct xhci_hcd *xhci)
+static int xhci_dbc_tty_register_device(struct xhci_hcd *xhci)
{
int ret;
struct device *tty_dev;
struct xhci_dbc *dbc = xhci->dbc;
struct dbc_port *port = &dbc->port;
+ struct tty_driver *dbc_tty_driver =
+ (struct tty_driver *) dbc->func_priv;
xhci_dbc_tty_init_port(xhci, port);
tty_dev = tty_port_register_device(&port->port,
@@ -493,6 +498,8 @@ void xhci_dbc_tty_unregister_device(struct xhci_hcd *xhci)
{
struct xhci_dbc *dbc = xhci->dbc;
struct dbc_port *port = &dbc->port;
+ struct tty_driver *dbc_tty_driver =
+ (struct tty_driver *) dbc->func_priv;
tty_unregister_device(dbc_tty_driver, 0);
xhci_dbc_tty_exit_port(port);
@@ -503,3 +510,61 @@ void xhci_dbc_tty_unregister_device(struct xhci_hcd *xhci)
xhci_dbc_free_requests(get_out_ep(xhci), &port->read_queue);
xhci_dbc_free_requests(get_in_ep(xhci), &port->write_pool);
}
+
+static int dbc_tty_post_config(struct xhci_dbc *dbc)
+{
+ return xhci_dbc_tty_register_device(dbc->xhci);
+}
+
+static int dbc_tty_post_disconnect(struct xhci_dbc *dbc)
+{
+ xhci_dbc_tty_unregister_device(dbc->xhci);
+ return 0;
+}
+
+static int dbc_tty_run(struct xhci_dbc *dbc)
+{
+ return xhci_dbc_tty_register_driver(dbc->xhci);
+}
+
+static int dbc_tty_stop(struct xhci_dbc *dbc)
+{
+ xhci_dbc_tty_unregister_driver(dbc);
+ return 0;
+}
+
+static struct dbc_function tty_func = {
+ .owner = THIS_MODULE,
+ .string = {
+ .manufacturer = DBC_STR_MANUFACTURER,
+ .product = DBC_STR_PRODUCT,
+ .serial = DBC_STR_SERIAL,
+ },
+ .protocol = DBC_PROTOCOL,
+ .vid = DBC_VENDOR_ID,
+ .pid = DBC_PRODUCT_ID,
+ .device_rev = DBC_DEVICE_REV,
+ .func_name = DBC_STR_FUNC_TTY,
+
+ .post_config = dbc_tty_post_config,
+ .post_disconnect = dbc_tty_post_disconnect,
+ .run = dbc_tty_run,
+ .stop = dbc_tty_stop,
+};
+
+static int __init xhci_dbc_tty_init(void)
+{
+ return xhci_dbc_register_function(&tty_func);
+}
+
+static void __exit xhci_dbc_tty_fini(void)
+{
+ xhci_dbc_unregister_function();
+}
+
+late_initcall(xhci_dbc_tty_init);
+module_exit(xhci_dbc_tty_fini);
+
+MODULE_DESCRIPTION("xHCI DbC tty driver");
+MODULE_AUTHOR("Baoulu Lu");
+MODULE_LICENSE("GPL");
--
2.21.0
