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xhci: dbc: Add a operations structure to access driver functions

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Don't call dbctty driver functions directly from dbc core code.
Introduce a new dbc_driver structure that contains function pointers
for disconnect and configure operations.

The driver (ttydbc) must provide these opeations when creating a dbc.

Name the structure dbc_driver instead of dbc_ops as we plan to
add more driver configureable values here, such as vid and pid.

Decouples dbc and dbctty.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200723144530.9992-26-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2020-07-23 17:45:28 +03:00 committed by Greg Kroah-Hartman
parent 4521f16139
commit 6ae6470bfa
3 changed files with 21 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/usb/host/xhci-dbgcap.c
View File

@ -636,8 +636,8 @@ static void xhci_dbc_stop(struct xhci_dbc *dbc)
cancel_delayed_work_sync(&dbc->event_work);
if (port->registered)
xhci_dbc_tty_unregister_device(dbc);
if (port->registered && dbc->driver->disconnect)
dbc->driver->disconnect(dbc);
spin_lock_irqsave(&dbc->lock, flags);
ret = xhci_do_dbc_stop(dbc);
@ -877,7 +877,6 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
static void xhci_dbc_handle_events(struct work_struct *work)
{
int ret;
enum evtreturn evtr;
struct xhci_dbc *dbc;
unsigned long flags;
@ -890,16 +889,12 @@ static void xhci_dbc_handle_events(struct work_struct *work)
switch (evtr) {
case EVT_GSER:
ret = xhci_dbc_tty_register_device(dbc);
if (ret) {
dev_err(dbc->dev, "failed to alloc tty device\n");
break;
}
dev_info(dbc->dev, "DbC now attached to /dev/ttyDBC0\n");
if (dbc->driver->configure)
dbc->driver->configure(dbc);
break;
case EVT_DISC:
xhci_dbc_tty_unregister_device(dbc);
if (dbc->driver->disconnect)
dbc->driver->disconnect(dbc);
break;
case EVT_DONE:
break;

8
drivers/usb/host/xhci-dbgcap.h
View File

@ -112,6 +112,11 @@ struct dbc_port {
bool registered;
};
struct dbc_driver {
int (*configure)(struct xhci_dbc *dbc);
void (*disconnect)(struct xhci_dbc *dbc);
};
struct xhci_dbc {
spinlock_t lock; /* device access */
struct device *dev;
@ -133,6 +138,7 @@ struct xhci_dbc {
struct dbc_ep eps[2];
struct dbc_port port;
const struct dbc_driver *driver;
};
struct dbc_request {
@ -192,8 +198,6 @@ int xhci_dbc_init(struct xhci_hcd *xhci);
void xhci_dbc_exit(struct xhci_hcd *xhci);
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,
unsigned int direction,
gfp_t flags);

11
drivers/usb/host/xhci-dbgtty.c
View File

@ -455,6 +455,11 @@ void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
xhci_dbc_free_requests(&port->write_pool);
}
static const struct dbc_driver dbc_driver = {
.configure = xhci_dbc_tty_register_device,
.disconnect = xhci_dbc_tty_unregister_device,
};
int xhci_dbc_tty_probe(struct xhci_hcd *xhci)
{
struct xhci_dbc *dbc = xhci->dbc;
@ -465,6 +470,8 @@ int xhci_dbc_tty_probe(struct xhci_hcd *xhci)
if (status)
return status;
dbc->driver = &dbc_driver;
dbc_tty_driver->driver_state = &dbc->port;
return 0;
@ -481,6 +488,8 @@ out:
*/
void xhci_dbc_tty_remove(struct xhci_dbc *dbc)
{
dbc->driver = NULL;
/* dbc_tty_exit will be called by module_exit() in the future */
dbc_tty_exit();
}
@ -523,5 +532,3 @@ static void dbc_tty_exit(void)
dbc_tty_driver = NULL;
}
}