From patchwork Fri Jun 29 06:19:56 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "lan,Tianyu" X-Patchwork-Id: 1130661 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id EE684DFF34 for ; Fri, 29 Jun 2012 06:28:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751258Ab2F2G23 (ORCPT ); Fri, 29 Jun 2012 02:28:29 -0400 Received: from mga11.intel.com ([192.55.52.93]:64347 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751162Ab2F2G23 (ORCPT ); Fri, 29 Jun 2012 02:28:29 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP; 28 Jun 2012 23:28:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="171510487" Received: from lantianyu-ws.sh.intel.com (HELO localhost) ([10.239.13.17]) by fmsmga001.fm.intel.com with ESMTP; 28 Jun 2012 23:28:27 -0700 From: Lan Tianyu To: gregkh@linuxfoundation.org, lenb@kernel.org Cc: Lan Tianyu , linux-usb@vger.kernel.org, linux-acpi@vger.kernel.org, stern@rowland.harvard.edu, sarah.a.sharp@linux.intel.com Subject: [PATCH V5 5/8] usb/acpi: add check for the connect type of usb port Date: Fri, 29 Jun 2012 14:19:56 +0800 Message-Id: <1340950799-3321-5-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.7.6.rc2.8.g28eb In-Reply-To: <1340950799-3321-1-git-send-email-tianyu.lan@intel.com> References: <1340950799-3321-1-git-send-email-tianyu.lan@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Change since v4: Remove some redundant kerneldocs and fix typo. Change since v3: Rebase on the patch "make usb port a real device" Check the connect type of usb port when getting the usb port's acpi_handle and store result into connect_type in the struct usb_port. Accoding 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. When a device was found on the port, if the connect_type was hot-plug, then the device would be removable. If the connect_type was hard-wired, the device would be non-removable. Signed-off-by: Lan Tianyu --- drivers/usb/core/hub.c | 32 +++++++++++++++++ drivers/usb/core/usb-acpi.c | 80 ++++++++++++++++++++++++------------------- drivers/usb/core/usb.h | 4 ++ include/linux/usb.h | 7 ++++ 4 files changed, 88 insertions(+), 35 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 16a1282..9012c73 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -41,6 +41,7 @@ struct usb_port { struct usb_device *child; struct device dev; struct dev_state *port_owner; + enum usb_port_connect_type connect_type; }; struct usb_hub { @@ -4989,6 +4990,37 @@ struct usb_device *usb_hub_get_child(struct usb_device *hdev, } EXPORT_SYMBOL_GPL(usb_hub_get_child); +/** + * usb_set_hub_port_connect_type - set hub port connect type. + * @hdev: USB device belonging to the usb hub + * @port1: port num of the port + * @type: connect type of the port + */ +void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, + enum usb_port_connect_type type) +{ + struct usb_hub *hub = hdev_to_hub(hdev); + + hub->ports[port1 - 1]->connect_type = type; +} + +/** + * usb_get_hub_port_connect_type - Get the port's connect + * type + * @hdev: USB device belonging to the usb hub + * @port1: port num of the port + * + * Return connect type of the port and if input params are + * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN. + */ +enum usb_port_connect_type +usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) +{ + struct usb_hub *hub = hdev_to_hub(hdev); + + return hub->ports[port1 - 1]->connect_type; +} + #ifdef CONFIG_ACPI /** * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c index 47197bf..404d86a 100644 --- a/drivers/usb/core/usb-acpi.c +++ b/drivers/usb/core/usb-acpi.c @@ -19,20 +19,29 @@ #include "usb.h" -static int usb_acpi_check_upc(struct usb_device *udev, acpi_handle handle) +static int usb_acpi_check_port_connect_type(struct usb_device *hdev, + acpi_handle handle, int port1) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *upc; + struct acpi_pld pld; int ret = 0; - status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer); - + /* + * Accoding 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_get_physical_device_location(handle, &pld); if (ACPI_FAILURE(status)) return -ENODEV; + status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer); upc = buffer.pointer; - if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4) { ret = -EINVAL; @@ -40,33 +49,20 @@ static int usb_acpi_check_upc(struct usb_device *udev, acpi_handle handle) } if (upc->package.elements[0].integer.value) - udev->removable = USB_DEVICE_REMOVABLE; - else - udev->removable = USB_DEVICE_FIXED; + if (pld.user_visible) + usb_set_hub_port_connect_type(hdev, port1, + USB_PORT_CONNECT_TYPE_HOT_PLUG); + else + usb_set_hub_port_connect_type(hdev, port1, + USB_PORT_CONNECT_TYPE_HARD_WIRED); + else if (!pld.user_visible) + usb_set_hub_port_connect_type(hdev, port1, USB_PORT_NOT_USED); out: kfree(upc); return ret; } -static int usb_acpi_check_pld(struct usb_device *udev, acpi_handle handle) -{ - acpi_status status; - struct acpi_pld pld; - - status = acpi_get_physical_device_location(handle, &pld); - - if (ACPI_FAILURE(status)) - return -ENODEV; - - if (pld.user_visible) - udev->removable = USB_DEVICE_REMOVABLE; - else - udev->removable = USB_DEVICE_FIXED; - - return 0; -} - static int usb_acpi_find_device(struct device *dev, acpi_handle *handle) { struct usb_device *udev; @@ -88,8 +84,30 @@ static int usb_acpi_find_device(struct device *dev, acpi_handle *handle) */ if (is_usb_device(dev)) { udev = to_usb_device(dev); - if (udev->parent) + if (udev->parent) { + enum usb_port_connect_type type; + + /* + * According usb port's connect type to set usb device's + * removability. + */ + type = usb_get_hub_port_connect_type(udev->parent, + udev->portnum); + switch (type) { + case USB_PORT_CONNECT_TYPE_HOT_PLUG: + udev->removable = USB_DEVICE_REMOVABLE; + break; + case USB_PORT_CONNECT_TYPE_HARD_WIRED: + udev->removable = USB_DEVICE_FIXED; + break; + default: + udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN; + break; + } + return -ENODEV; + } + /* root hub's parent is the usb hcd. */ parent_handle = DEVICE_ACPI_HANDLE(dev->parent); *handle = acpi_get_child(parent_handle, udev->portnum); @@ -122,18 +140,10 @@ static int usb_acpi_find_device(struct device *dev, acpi_handle *handle) if (!*handle) return -ENODEV; } + usb_acpi_check_port_connect_type(udev, *handle, port_num); } else return -ENODEV; - /* - * PLD will tell us whether a port is removable to the user or - * not. If we don't get an answer from PLD (it's not present - * or it's malformed) then try to infer it from UPC. If a - * device isn't connectable then it's probably not removable. - */ - if (usb_acpi_check_pld(udev, *handle) != 0) - usb_acpi_check_upc(udev, *handle); - return 0; } diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 4aa20f4..bbd7df4 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -168,6 +168,10 @@ extern void usb_notify_add_device(struct usb_device *udev); extern void usb_notify_remove_device(struct usb_device *udev); extern void usb_notify_add_bus(struct usb_bus *ubus); extern void usb_notify_remove_bus(struct usb_bus *ubus); +extern enum usb_port_connect_type + usb_get_hub_port_connect_type(struct usb_device *hdev, int port1); +extern void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, + enum usb_port_connect_type type); #ifdef CONFIG_ACPI extern int usb_acpi_register(void); diff --git a/include/linux/usb.h b/include/linux/usb.h index 84ac047..016fa98 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -378,6 +378,13 @@ enum usb_device_removable { USB_DEVICE_FIXED, }; +enum usb_port_connect_type { + USB_PORT_CONNECT_TYPE_UNKNOWN = 0, + USB_PORT_CONNECT_TYPE_HOT_PLUG, + USB_PORT_CONNECT_TYPE_HARD_WIRED, + USB_PORT_NOT_USED, +}; + /* * USB 3.0 Link Power Management (LPM) parameters. *