From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/usb/core/usb-acpi.c | 228 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 228 insertions(+) create mode 100644 drivers/usb/core/usb-acpi.c (limited to 'drivers/usb/core/usb-acpi.c') diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c new file mode 100644 index 000000000..2776cfe64 --- /dev/null +++ b/drivers/usb/core/usb-acpi.c @@ -0,0 +1,228 @@ +/* + * USB-ACPI glue code + * + * Copyright 2012 Red Hat + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation, version 2. + * + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include "hub.h" + +/** + * usb_acpi_power_manageable - check whether usb port has + * acpi power resource. + * @hdev: USB device belonging to the usb hub + * @index: port index based zero + * + * Return true if the port has acpi power resource and false if no. + */ +bool usb_acpi_power_manageable(struct usb_device *hdev, int index) +{ + acpi_handle port_handle; + int port1 = index + 1; + + port_handle = usb_get_hub_port_acpi_handle(hdev, + port1); + if (port_handle) + return acpi_bus_power_manageable(port_handle); + else + return false; +} +EXPORT_SYMBOL_GPL(usb_acpi_power_manageable); + +/** + * usb_acpi_set_power_state - control usb port's power via acpi power + * resource + * @hdev: USB device belonging to the usb hub + * @index: port index based zero + * @enable: power state expected to be set + * + * Notice to use usb_acpi_power_manageable() to check whether the usb port + * has acpi power resource before invoking this function. + * + * Returns 0 on success, else negative errno. + */ +int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable) +{ + struct usb_hub *hub = usb_hub_to_struct_hub(hdev); + struct usb_port *port_dev; + acpi_handle port_handle; + unsigned char state; + int port1 = index + 1; + int error = -EINVAL; + + if (!hub) + return -ENODEV; + port_dev = hub->ports[port1 - 1]; + + port_handle = (acpi_handle) usb_get_hub_port_acpi_handle(hdev, port1); + if (!port_handle) + return error; + + if (enable) + state = ACPI_STATE_D0; + else + state = ACPI_STATE_D3_COLD; + + error = acpi_bus_set_power(port_handle, state); + if (!error) + dev_dbg(&port_dev->dev, "acpi: power was set to %d\n", enable); + else + dev_dbg(&port_dev->dev, "acpi: power failed to be set\n"); + + return error; +} +EXPORT_SYMBOL_GPL(usb_acpi_set_power_state); + +static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle, + struct acpi_pld_info *pld) +{ + enum usb_port_connect_type connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *upc; + acpi_status status; + + /* + * According to ACPI Spec 9.13. PLD indicates whether usb port is + * user visible and _UPC indicates whether it is connectable. If + * the port was visible and connectable, it could be freely connected + * and disconnected with USB devices. If no visible and connectable, + * a usb device is directly hard-wired to the port. If no visible and + * no connectable, the port would be not used. + */ + status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer); + upc = buffer.pointer; + if (!upc || (upc->type != ACPI_TYPE_PACKAGE) + || upc->package.count != 4) { + goto out; + } + + if (upc->package.elements[0].integer.value) + if (pld->user_visible) + connect_type = USB_PORT_CONNECT_TYPE_HOT_PLUG; + else + connect_type = USB_PORT_CONNECT_TYPE_HARD_WIRED; + else if (!pld->user_visible) + connect_type = USB_PORT_NOT_USED; +out: + kfree(upc); + return connect_type; +} + + +/* + * Private to usb-acpi, all the core needs to know is that + * port_dev->location is non-zero when it has been set by the firmware. + */ +#define USB_ACPI_LOCATION_VALID (1 << 31) + +static struct acpi_device *usb_acpi_find_companion(struct device *dev) +{ + struct usb_device *udev; + struct acpi_device *adev; + acpi_handle *parent_handle; + + /* + * In the ACPI DSDT table, only usb root hub and usb ports are + * acpi device nodes. The hierarchy like following. + * Device (EHC1) + * Device (HUBN) + * Device (PR01) + * Device (PR11) + * Device (PR12) + * Device (PR13) + * ... + * So all binding process is divided into two parts. binding + * root hub and usb ports. + */ + if (is_usb_device(dev)) { + udev = to_usb_device(dev); + if (udev->parent) + return NULL; + + /* root hub is only child (_ADR=0) under its parent, the HC */ + adev = ACPI_COMPANION(dev->parent); + return acpi_find_child_device(adev, 0, false); + } else if (is_usb_port(dev)) { + struct usb_port *port_dev = to_usb_port(dev); + int port1 = port_dev->portnum; + struct acpi_pld_info *pld; + acpi_handle *handle; + acpi_status status; + + /* Get the struct usb_device point of port's hub */ + udev = to_usb_device(dev->parent->parent); + + /* + * The root hub ports' parent is the root hub. The non-root-hub + * ports' parent is the parent hub port which the hub is + * connected to. + */ + if (!udev->parent) { + struct usb_hcd *hcd = bus_to_hcd(udev->bus); + int raw; + + raw = usb_hcd_find_raw_port_number(hcd, port1); + adev = acpi_find_child_device(ACPI_COMPANION(&udev->dev), + raw, false); + if (!adev) + return NULL; + } else { + parent_handle = + usb_get_hub_port_acpi_handle(udev->parent, + udev->portnum); + if (!parent_handle) + return NULL; + + acpi_bus_get_device(parent_handle, &adev); + adev = acpi_find_child_device(adev, port1, false); + if (!adev) + return NULL; + } + handle = adev->handle; + status = acpi_get_physical_device_location(handle, &pld); + if (ACPI_FAILURE(status) || !pld) + return adev; + + port_dev->location = USB_ACPI_LOCATION_VALID + | pld->group_token << 8 | pld->group_position; + port_dev->connect_type = usb_acpi_get_connect_type(handle, pld); + ACPI_FREE(pld); + + return adev; + } + + return NULL; +} + +static bool usb_acpi_bus_match(struct device *dev) +{ + return is_usb_device(dev) || is_usb_port(dev); +} + +static struct acpi_bus_type usb_acpi_bus = { + .name = "USB", + .match = usb_acpi_bus_match, + .find_companion = usb_acpi_find_companion, +}; + +int usb_acpi_register(void) +{ + return register_acpi_bus_type(&usb_acpi_bus); +} + +void usb_acpi_unregister(void) +{ + unregister_acpi_bus_type(&usb_acpi_bus); +} -- cgit v1.2.3