hotplug ports maintain power awaiting hotplug events. Allow userspace to
override this disctinction on a per port basis.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/usb/core/port.c | 32 +++++++++++++++++++++++++++++-
drivers/usb/core/usb-platform.c | 42 +++++++++++++++++++++++++++++++++++++++
drivers/usb/core/usb-platform.h | 2 ++
3 files changed, 75 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index d609b25746d2..71fbedaf8a93 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -47,7 +47,37 @@ static ssize_t connect_type_show(struct device *dev,
return sprintf(buf, "%s\n", result);
}
-static DEVICE_ATTR_RO(connect_type);
+
+
+static ssize_t connect_type_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ ssize_t sz = len;
+ int i;
+ struct action { const char *str; enum usb_port_connect_type type; };
+ static const struct action action[] = {
+ { .str = "hotplug", .type = USB_PORT_CONNECT_TYPE_HOT_PLUG, },
+ { .str = "hardwired", .type = USB_PORT_CONNECT_TYPE_HARD_WIRED },
+ };
+
+ if (buf[len-1] == '\n' || buf[len-1] == '\0')
+ sz--;
+
+ for (i = 0; i < ARRAY_SIZE(action); i++) {
+ const struct action *act = &action[i];
+
+ if (sz == strlen(act->str)
+ && strncmp(buf, act->str, sz) == 0) {
+ usb_connector_set_connect_type(port_dev, act->type);
+ return len;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static DEVICE_ATTR_RW(connect_type);
static struct attribute *port_dev_attrs[] = {
&dev_attr_connect_type.attr,
diff --git a/drivers/usb/core/usb-platform.c b/drivers/usb/core/usb-platform.c
index 0e24110e8ba2..ce559994760e 100644
--- a/drivers/usb/core/usb-platform.c
+++ b/drivers/usb/core/usb-platform.c
@@ -91,6 +91,48 @@ bool usb_connector_notify_flags(struct usb_port *port_dev, s32 mask, bool set)
return true;
}
+void usb_connector_set_connect_type(struct usb_port *port_dev,
+ enum usb_port_connect_type type)
+{
+ LIST_HEAD(tmp);
+ struct usb_port *p;
+ struct usb_domain *udom;
+ int flag = PM_QOS_FLAG_NO_NOTIFY;
+ struct usb_connector *uconn = port_dev->connector;
+
+ /* if for some reason userspace does not want hotplug settings
+ * synced
+ */
+ if (dev_pm_qos_flags(&port_dev->dev, flag) == PM_QOS_FLAGS_ALL
+ || !uconn) {
+ pm_runtime_get_sync(&port_dev->dev);
+ port_dev->connect_type = type;
+ pm_runtime_put(&port_dev->dev);
+ }
+
+ udom = uconn->domain;
+ mutex_lock(&udom->lock);
+ uconn->connect_type = type;
+ list_for_each_entry(port_dev, &uconn->ports, node) {
+ pm_runtime_get_sync(&port_dev->dev);
+ port_dev->connect_type = type;
+ }
+
+ /* order the resulting suspensions disconnected ports first */
+ list_for_each_entry_safe(port_dev, p, &uconn->ports, node) {
+ if (port_dev->child)
+ list_move(&port_dev->node, &tmp);
+ else
+ pm_runtime_put(&port_dev->dev);
+ }
+
+ list_for_each_entry_safe(port_dev, p, &tmp, node) {
+ list_move(&port_dev->node, &uconn->ports);
+ pm_runtime_put(&port_dev->dev);
+ }
+ mutex_unlock(&udom->lock);
+}
+
static struct usb_connector *create_connector(struct usb_domain *udom,
struct usb_port *port_dev,
size_t pair_data)
diff --git a/drivers/usb/core/usb-platform.h b/drivers/usb/core/usb-platform.h
index 648dbe6d9e54..f73bc309eef3 100644
--- a/drivers/usb/core/usb-platform.h
+++ b/drivers/usb/core/usb-platform.h
@@ -52,3 +52,5 @@ bool usb_connector_notify_flags(struct usb_port *port_dev, s32 mask, bool set);
enum usb_connector_state usb_connector_state(struct usb_port *port_dev);
void usb_connector_connect(struct usb_port *port_dev);
void usb_connector_disconnect(struct usb_port *port_dev);
+void usb_connector_set_connect_type(struct usb_port *port_dev,
+ enum usb_port_connect_type type);
--
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