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path: root/drivers/usb/core/port.c
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Diffstat (limited to 'drivers/usb/core/port.c')
-rw-r--r--drivers/usb/core/port.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
new file mode 100644
index 000000000000..797f9d514732
--- /dev/null
+++ b/drivers/usb/core/port.c
@@ -0,0 +1,202 @@
+/*
+ * usb port device code
+ *
+ * Copyright (C) 2012 Intel Corp
+ *
+ * Author: Lan Tianyu <tianyu.lan@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/pm_qos.h>
+
+#include "hub.h"
+
+static const struct attribute_group *port_dev_group[];
+
+static ssize_t show_port_connect_type(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ char *result;
+
+ switch (port_dev->connect_type) {
+ case USB_PORT_CONNECT_TYPE_HOT_PLUG:
+ result = "hotplug";
+ break;
+ case USB_PORT_CONNECT_TYPE_HARD_WIRED:
+ result = "hardwired";
+ break;
+ case USB_PORT_NOT_USED:
+ result = "not used";
+ break;
+ default:
+ result = "unknown";
+ break;
+ }
+
+ return sprintf(buf, "%s\n", result);
+}
+static DEVICE_ATTR(connect_type, S_IRUGO, show_port_connect_type,
+ NULL);
+
+static struct attribute *port_dev_attrs[] = {
+ &dev_attr_connect_type.attr,
+ NULL,
+};
+
+static struct attribute_group port_dev_attr_grp = {
+ .attrs = port_dev_attrs,
+};
+
+static const struct attribute_group *port_dev_group[] = {
+ &port_dev_attr_grp,
+ NULL,
+};
+
+static void usb_port_device_release(struct device *dev)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+
+ dev_pm_qos_hide_flags(dev);
+ kfree(port_dev);
+}
+
+#ifdef CONFIG_USB_SUSPEND
+static int usb_port_runtime_resume(struct device *dev)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ struct usb_device *hdev = to_usb_device(dev->parent->parent);
+ struct usb_interface *intf = to_usb_interface(dev->parent);
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+ int port1 = port_dev->portnum;
+ int retval;
+
+ if (!hub)
+ return -EINVAL;
+
+ usb_autopm_get_interface(intf);
+ set_bit(port1, hub->busy_bits);
+
+ retval = usb_hub_set_port_power(hdev, port1, true);
+ if (port_dev->child && !retval) {
+ /*
+ * Wait for usb hub port to be reconnected in order to make
+ * the resume procedure successful.
+ */
+ retval = hub_port_debounce_be_connected(hub, port1);
+ if (retval < 0) {
+ dev_dbg(&port_dev->dev, "can't get reconnection after setting port power on, status %d\n",
+ retval);
+ goto out;
+ }
+ usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
+
+ /* Set return value to 0 if debounce successful */
+ retval = 0;
+ }
+
+out:
+ clear_bit(port1, hub->busy_bits);
+ usb_autopm_put_interface(intf);
+ return retval;
+}
+
+static int usb_port_runtime_suspend(struct device *dev)
+{
+ struct usb_port *port_dev = to_usb_port(dev);
+ struct usb_device *hdev = to_usb_device(dev->parent->parent);
+ struct usb_interface *intf = to_usb_interface(dev->parent);
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+ int port1 = port_dev->portnum;
+ int retval;
+
+ if (!hub)
+ return -EINVAL;
+
+ if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
+ == PM_QOS_FLAGS_ALL)
+ return -EAGAIN;
+
+ usb_autopm_get_interface(intf);
+ set_bit(port1, hub->busy_bits);
+ retval = usb_hub_set_port_power(hdev, port1, false);
+ usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
+ usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
+ clear_bit(port1, hub->busy_bits);
+ usb_autopm_put_interface(intf);
+ return retval;
+}
+#endif
+
+static const struct dev_pm_ops usb_port_pm_ops = {
+#ifdef CONFIG_USB_SUSPEND
+ .runtime_suspend = usb_port_runtime_suspend,
+ .runtime_resume = usb_port_runtime_resume,
+ .runtime_idle = pm_generic_runtime_idle,
+#endif
+};
+
+struct device_type usb_port_device_type = {
+ .name = "usb_port",
+ .release = usb_port_device_release,
+ .pm = &usb_port_pm_ops,
+};
+
+int usb_hub_create_port_device(struct usb_hub *hub, int port1)
+{
+ struct usb_port *port_dev = NULL;
+ int retval;
+
+ port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
+ if (!port_dev) {
+ retval = -ENOMEM;
+ goto exit;
+ }
+
+ hub->ports[port1 - 1] = port_dev;
+ port_dev->portnum = port1;
+ port_dev->power_is_on = true;
+ port_dev->dev.parent = hub->intfdev;
+ port_dev->dev.groups = port_dev_group;
+ port_dev->dev.type = &usb_port_device_type;
+ dev_set_name(&port_dev->dev, "port%d", port1);
+
+ retval = device_register(&port_dev->dev);
+ if (retval)
+ goto error_register;
+
+ pm_runtime_set_active(&port_dev->dev);
+
+ /* It would be dangerous if user space couldn't
+ * prevent usb device from being powered off. So don't
+ * enable port runtime pm if failed to expose port's pm qos.
+ */
+ if (!dev_pm_qos_expose_flags(&port_dev->dev,
+ PM_QOS_FLAG_NO_POWER_OFF))
+ pm_runtime_enable(&port_dev->dev);
+
+ device_enable_async_suspend(&port_dev->dev);
+ return 0;
+
+error_register:
+ put_device(&port_dev->dev);
+exit:
+ return retval;
+}
+
+void usb_hub_remove_port_device(struct usb_hub *hub,
+ int port1)
+{
+ device_unregister(&hub->ports[port1 - 1]->dev);
+}
+
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