/* * 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); } ix the opcode in arch_decode_instruction(). The previous value (0xc5) seems to correspond to LDS. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170118132921.19319-1-jslaby@suse.cz Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/core/net-sysfs.c')