diff options
Diffstat (limited to 'drivers/usb/core/port.c')
| -rw-r--r-- | drivers/usb/core/port.c | 202 |
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); +} + |