7dd19e69d1
Replace if-elseif-else with switch-case to keep the code consistent which is semantically same Switch-case is used here, http://www.spinics.net/lists/linux-usb/msg17201.html Making consistent at other places in usb/core Also easier to read and maintain when USB4.0, 5.0, ... comes Signed-off-by: Viral Mehta <viral.mehta@einfochips.com> Tested-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2236 lines
64 KiB
C
2236 lines
64 KiB
C
/*
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* (C) Copyright Linus Torvalds 1999
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* (C) Copyright Johannes Erdfelt 1999-2001
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* (C) Copyright Andreas Gal 1999
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* (C) Copyright Gregory P. Smith 1999
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* (C) Copyright Deti Fliegl 1999
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* (C) Copyright Randy Dunlap 2000
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* (C) Copyright David Brownell 2000-2002
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include <linux/utsname.h>
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#include <linux/mm.h>
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#include <asm/io.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/mutex.h>
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#include <asm/irq.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/usb.h>
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#include "usb.h"
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#include "hcd.h"
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#include "hub.h"
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/*-------------------------------------------------------------------------*/
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/*
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* USB Host Controller Driver framework
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*
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* Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
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* HCD-specific behaviors/bugs.
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*
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* This does error checks, tracks devices and urbs, and delegates to a
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* "hc_driver" only for code (and data) that really needs to know about
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* hardware differences. That includes root hub registers, i/o queues,
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* and so on ... but as little else as possible.
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*
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* Shared code includes most of the "root hub" code (these are emulated,
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* though each HC's hardware works differently) and PCI glue, plus request
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* tracking overhead. The HCD code should only block on spinlocks or on
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* hardware handshaking; blocking on software events (such as other kernel
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* threads releasing resources, or completing actions) is all generic.
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*
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* Happens the USB 2.0 spec says this would be invisible inside the "USBD",
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* and includes mostly a "HCDI" (HCD Interface) along with some APIs used
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* only by the hub driver ... and that neither should be seen or used by
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* usb client device drivers.
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*
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* Contributors of ideas or unattributed patches include: David Brownell,
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* Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
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*
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* HISTORY:
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* 2002-02-21 Pull in most of the usb_bus support from usb.c; some
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* associated cleanup. "usb_hcd" still != "usb_bus".
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* 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
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*/
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/*-------------------------------------------------------------------------*/
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/* Keep track of which host controller drivers are loaded */
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unsigned long usb_hcds_loaded;
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EXPORT_SYMBOL_GPL(usb_hcds_loaded);
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/* host controllers we manage */
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LIST_HEAD (usb_bus_list);
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EXPORT_SYMBOL_GPL (usb_bus_list);
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/* used when allocating bus numbers */
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#define USB_MAXBUS 64
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struct usb_busmap {
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unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
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};
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static struct usb_busmap busmap;
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/* used when updating list of hcds */
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DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
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EXPORT_SYMBOL_GPL (usb_bus_list_lock);
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/* used for controlling access to virtual root hubs */
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static DEFINE_SPINLOCK(hcd_root_hub_lock);
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/* used when updating an endpoint's URB list */
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static DEFINE_SPINLOCK(hcd_urb_list_lock);
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/* used to protect against unlinking URBs after the device is gone */
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static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
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/* wait queue for synchronous unlinks */
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DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
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static inline int is_root_hub(struct usb_device *udev)
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{
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return (udev->parent == NULL);
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}
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/*-------------------------------------------------------------------------*/
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/*
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* Sharable chunks of root hub code.
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*/
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/*-------------------------------------------------------------------------*/
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#define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
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#define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
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/* usb 3.0 root hub device descriptor */
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static const u8 usb3_rh_dev_descriptor[18] = {
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0x12, /* __u8 bLength; */
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0x01, /* __u8 bDescriptorType; Device */
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0x00, 0x03, /* __le16 bcdUSB; v3.0 */
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0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
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0x00, /* __u8 bDeviceSubClass; */
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0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
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0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
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0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
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0x02, 0x00, /* __le16 idProduct; device 0x0002 */
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KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
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0x03, /* __u8 iManufacturer; */
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0x02, /* __u8 iProduct; */
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0x01, /* __u8 iSerialNumber; */
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0x01 /* __u8 bNumConfigurations; */
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};
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/* usb 2.0 root hub device descriptor */
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static const u8 usb2_rh_dev_descriptor [18] = {
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0x12, /* __u8 bLength; */
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0x01, /* __u8 bDescriptorType; Device */
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0x00, 0x02, /* __le16 bcdUSB; v2.0 */
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0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
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0x00, /* __u8 bDeviceSubClass; */
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0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
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0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
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0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
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0x02, 0x00, /* __le16 idProduct; device 0x0002 */
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KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
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0x03, /* __u8 iManufacturer; */
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0x02, /* __u8 iProduct; */
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0x01, /* __u8 iSerialNumber; */
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0x01 /* __u8 bNumConfigurations; */
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};
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/* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
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/* usb 1.1 root hub device descriptor */
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static const u8 usb11_rh_dev_descriptor [18] = {
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0x12, /* __u8 bLength; */
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0x01, /* __u8 bDescriptorType; Device */
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0x10, 0x01, /* __le16 bcdUSB; v1.1 */
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0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
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0x00, /* __u8 bDeviceSubClass; */
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0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
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0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
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0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
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0x01, 0x00, /* __le16 idProduct; device 0x0001 */
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KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
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0x03, /* __u8 iManufacturer; */
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0x02, /* __u8 iProduct; */
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0x01, /* __u8 iSerialNumber; */
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0x01 /* __u8 bNumConfigurations; */
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};
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/*-------------------------------------------------------------------------*/
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/* Configuration descriptors for our root hubs */
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static const u8 fs_rh_config_descriptor [] = {
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/* one configuration */
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0x09, /* __u8 bLength; */
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0x02, /* __u8 bDescriptorType; Configuration */
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0x19, 0x00, /* __le16 wTotalLength; */
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0x01, /* __u8 bNumInterfaces; (1) */
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0x01, /* __u8 bConfigurationValue; */
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0x00, /* __u8 iConfiguration; */
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0xc0, /* __u8 bmAttributes;
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Bit 7: must be set,
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6: Self-powered,
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5: Remote wakeup,
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4..0: resvd */
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0x00, /* __u8 MaxPower; */
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/* USB 1.1:
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* USB 2.0, single TT organization (mandatory):
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* one interface, protocol 0
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*
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* USB 2.0, multiple TT organization (optional):
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* two interfaces, protocols 1 (like single TT)
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* and 2 (multiple TT mode) ... config is
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* sometimes settable
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* NOT IMPLEMENTED
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*/
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/* one interface */
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0x09, /* __u8 if_bLength; */
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0x04, /* __u8 if_bDescriptorType; Interface */
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0x00, /* __u8 if_bInterfaceNumber; */
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0x00, /* __u8 if_bAlternateSetting; */
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0x01, /* __u8 if_bNumEndpoints; */
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0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
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0x00, /* __u8 if_bInterfaceSubClass; */
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0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
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0x00, /* __u8 if_iInterface; */
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/* one endpoint (status change endpoint) */
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0x07, /* __u8 ep_bLength; */
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0x05, /* __u8 ep_bDescriptorType; Endpoint */
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0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
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0x03, /* __u8 ep_bmAttributes; Interrupt */
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0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
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0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
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};
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static const u8 hs_rh_config_descriptor [] = {
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/* one configuration */
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0x09, /* __u8 bLength; */
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0x02, /* __u8 bDescriptorType; Configuration */
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0x19, 0x00, /* __le16 wTotalLength; */
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0x01, /* __u8 bNumInterfaces; (1) */
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0x01, /* __u8 bConfigurationValue; */
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0x00, /* __u8 iConfiguration; */
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0xc0, /* __u8 bmAttributes;
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Bit 7: must be set,
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6: Self-powered,
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5: Remote wakeup,
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4..0: resvd */
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0x00, /* __u8 MaxPower; */
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/* USB 1.1:
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* USB 2.0, single TT organization (mandatory):
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* one interface, protocol 0
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*
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* USB 2.0, multiple TT organization (optional):
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* two interfaces, protocols 1 (like single TT)
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* and 2 (multiple TT mode) ... config is
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* sometimes settable
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* NOT IMPLEMENTED
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*/
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/* one interface */
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0x09, /* __u8 if_bLength; */
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0x04, /* __u8 if_bDescriptorType; Interface */
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0x00, /* __u8 if_bInterfaceNumber; */
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0x00, /* __u8 if_bAlternateSetting; */
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0x01, /* __u8 if_bNumEndpoints; */
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0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
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0x00, /* __u8 if_bInterfaceSubClass; */
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0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
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0x00, /* __u8 if_iInterface; */
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/* one endpoint (status change endpoint) */
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0x07, /* __u8 ep_bLength; */
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0x05, /* __u8 ep_bDescriptorType; Endpoint */
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0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
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0x03, /* __u8 ep_bmAttributes; Interrupt */
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/* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
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* see hub.c:hub_configure() for details. */
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(USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
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0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
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};
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static const u8 ss_rh_config_descriptor[] = {
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/* one configuration */
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0x09, /* __u8 bLength; */
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0x02, /* __u8 bDescriptorType; Configuration */
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0x19, 0x00, /* __le16 wTotalLength; FIXME */
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0x01, /* __u8 bNumInterfaces; (1) */
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0x01, /* __u8 bConfigurationValue; */
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0x00, /* __u8 iConfiguration; */
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0xc0, /* __u8 bmAttributes;
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Bit 7: must be set,
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6: Self-powered,
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5: Remote wakeup,
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4..0: resvd */
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0x00, /* __u8 MaxPower; */
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/* one interface */
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0x09, /* __u8 if_bLength; */
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0x04, /* __u8 if_bDescriptorType; Interface */
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0x00, /* __u8 if_bInterfaceNumber; */
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0x00, /* __u8 if_bAlternateSetting; */
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0x01, /* __u8 if_bNumEndpoints; */
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0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
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0x00, /* __u8 if_bInterfaceSubClass; */
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0x00, /* __u8 if_bInterfaceProtocol; */
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0x00, /* __u8 if_iInterface; */
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/* one endpoint (status change endpoint) */
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0x07, /* __u8 ep_bLength; */
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0x05, /* __u8 ep_bDescriptorType; Endpoint */
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0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
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0x03, /* __u8 ep_bmAttributes; Interrupt */
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/* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
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* see hub.c:hub_configure() for details. */
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(USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
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0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
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/*
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* All 3.0 hubs should have an endpoint companion descriptor,
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* but we're ignoring that for now. FIXME?
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*/
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};
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/*-------------------------------------------------------------------------*/
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/*
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* helper routine for returning string descriptors in UTF-16LE
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* input can actually be ISO-8859-1; ASCII is its 7-bit subset
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*/
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static unsigned ascii2utf(char *s, u8 *utf, int utfmax)
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{
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unsigned retval;
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for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) {
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*utf++ = *s++;
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*utf++ = 0;
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}
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if (utfmax > 0) {
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*utf = *s;
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++retval;
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}
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return retval;
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}
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/*
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* rh_string - provides manufacturer, product and serial strings for root hub
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* @id: the string ID number (1: serial number, 2: product, 3: vendor)
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* @hcd: the host controller for this root hub
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* @data: return packet in UTF-16 LE
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* @len: length of the return packet
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*
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* Produces either a manufacturer, product or serial number string for the
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* virtual root hub device.
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*/
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static unsigned rh_string(int id, struct usb_hcd *hcd, u8 *data, unsigned len)
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{
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char buf [100];
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// language ids
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if (id == 0) {
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buf[0] = 4; buf[1] = 3; /* 4 bytes string data */
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buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */
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len = min_t(unsigned, len, 4);
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memcpy (data, buf, len);
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return len;
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// serial number
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} else if (id == 1) {
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strlcpy (buf, hcd->self.bus_name, sizeof buf);
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// product description
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} else if (id == 2) {
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strlcpy (buf, hcd->product_desc, sizeof buf);
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// id 3 == vendor description
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} else if (id == 3) {
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snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
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init_utsname()->release, hcd->driver->description);
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}
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switch (len) { /* All cases fall through */
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default:
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len = 2 + ascii2utf (buf, data + 2, len - 2);
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case 2:
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data [1] = 3; /* type == string */
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case 1:
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data [0] = 2 * (strlen (buf) + 1);
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case 0:
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; /* Compiler wants a statement here */
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}
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return len;
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}
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|
|
|
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/* Root hub control transfers execute synchronously */
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static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
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{
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struct usb_ctrlrequest *cmd;
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u16 typeReq, wValue, wIndex, wLength;
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u8 *ubuf = urb->transfer_buffer;
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u8 tbuf [sizeof (struct usb_hub_descriptor)]
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__attribute__((aligned(4)));
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const u8 *bufp = tbuf;
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unsigned len = 0;
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int status;
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u8 patch_wakeup = 0;
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u8 patch_protocol = 0;
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might_sleep();
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spin_lock_irq(&hcd_root_hub_lock);
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status = usb_hcd_link_urb_to_ep(hcd, urb);
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spin_unlock_irq(&hcd_root_hub_lock);
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if (status)
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return status;
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urb->hcpriv = hcd; /* Indicate it's queued */
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cmd = (struct usb_ctrlrequest *) urb->setup_packet;
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typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
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wValue = le16_to_cpu (cmd->wValue);
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wIndex = le16_to_cpu (cmd->wIndex);
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wLength = le16_to_cpu (cmd->wLength);
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if (wLength > urb->transfer_buffer_length)
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goto error;
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urb->actual_length = 0;
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switch (typeReq) {
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|
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/* DEVICE REQUESTS */
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|
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/* The root hub's remote wakeup enable bit is implemented using
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* driver model wakeup flags. If this system supports wakeup
|
|
* through USB, userspace may change the default "allow wakeup"
|
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* policy through sysfs or these calls.
|
|
*
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* Most root hubs support wakeup from downstream devices, for
|
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* runtime power management (disabling USB clocks and reducing
|
|
* VBUS power usage). However, not all of them do so; silicon,
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* board, and BIOS bugs here are not uncommon, so these can't
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* be treated quite like external hubs.
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*
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* Likewise, not all root hubs will pass wakeup events upstream,
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* to wake up the whole system. So don't assume root hub and
|
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* controller capabilities are identical.
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|
*/
|
|
|
|
case DeviceRequest | USB_REQ_GET_STATUS:
|
|
tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
|
|
<< USB_DEVICE_REMOTE_WAKEUP)
|
|
| (1 << USB_DEVICE_SELF_POWERED);
|
|
tbuf [1] = 0;
|
|
len = 2;
|
|
break;
|
|
case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
|
|
if (wValue == USB_DEVICE_REMOTE_WAKEUP)
|
|
device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
|
|
else
|
|
goto error;
|
|
break;
|
|
case DeviceOutRequest | USB_REQ_SET_FEATURE:
|
|
if (device_can_wakeup(&hcd->self.root_hub->dev)
|
|
&& wValue == USB_DEVICE_REMOTE_WAKEUP)
|
|
device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
|
|
else
|
|
goto error;
|
|
break;
|
|
case DeviceRequest | USB_REQ_GET_CONFIGURATION:
|
|
tbuf [0] = 1;
|
|
len = 1;
|
|
/* FALLTHROUGH */
|
|
case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
|
|
break;
|
|
case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
|
|
switch (wValue & 0xff00) {
|
|
case USB_DT_DEVICE << 8:
|
|
switch (hcd->driver->flags & HCD_MASK) {
|
|
case HCD_USB3:
|
|
bufp = usb3_rh_dev_descriptor;
|
|
break;
|
|
case HCD_USB2:
|
|
bufp = usb2_rh_dev_descriptor;
|
|
break;
|
|
case HCD_USB11:
|
|
bufp = usb11_rh_dev_descriptor;
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
len = 18;
|
|
if (hcd->has_tt)
|
|
patch_protocol = 1;
|
|
break;
|
|
case USB_DT_CONFIG << 8:
|
|
switch (hcd->driver->flags & HCD_MASK) {
|
|
case HCD_USB3:
|
|
bufp = ss_rh_config_descriptor;
|
|
len = sizeof ss_rh_config_descriptor;
|
|
break;
|
|
case HCD_USB2:
|
|
bufp = hs_rh_config_descriptor;
|
|
len = sizeof hs_rh_config_descriptor;
|
|
break;
|
|
case HCD_USB11:
|
|
bufp = fs_rh_config_descriptor;
|
|
len = sizeof fs_rh_config_descriptor;
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
if (device_can_wakeup(&hcd->self.root_hub->dev))
|
|
patch_wakeup = 1;
|
|
break;
|
|
case USB_DT_STRING << 8:
|
|
if ((wValue & 0xff) < 4)
|
|
urb->actual_length = rh_string(wValue & 0xff,
|
|
hcd, ubuf, wLength);
|
|
else /* unsupported IDs --> "protocol stall" */
|
|
goto error;
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
break;
|
|
case DeviceRequest | USB_REQ_GET_INTERFACE:
|
|
tbuf [0] = 0;
|
|
len = 1;
|
|
/* FALLTHROUGH */
|
|
case DeviceOutRequest | USB_REQ_SET_INTERFACE:
|
|
break;
|
|
case DeviceOutRequest | USB_REQ_SET_ADDRESS:
|
|
// wValue == urb->dev->devaddr
|
|
dev_dbg (hcd->self.controller, "root hub device address %d\n",
|
|
wValue);
|
|
break;
|
|
|
|
/* INTERFACE REQUESTS (no defined feature/status flags) */
|
|
|
|
/* ENDPOINT REQUESTS */
|
|
|
|
case EndpointRequest | USB_REQ_GET_STATUS:
|
|
// ENDPOINT_HALT flag
|
|
tbuf [0] = 0;
|
|
tbuf [1] = 0;
|
|
len = 2;
|
|
/* FALLTHROUGH */
|
|
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
|
|
case EndpointOutRequest | USB_REQ_SET_FEATURE:
|
|
dev_dbg (hcd->self.controller, "no endpoint features yet\n");
|
|
break;
|
|
|
|
/* CLASS REQUESTS (and errors) */
|
|
|
|
default:
|
|
/* non-generic request */
|
|
switch (typeReq) {
|
|
case GetHubStatus:
|
|
case GetPortStatus:
|
|
len = 4;
|
|
break;
|
|
case GetHubDescriptor:
|
|
len = sizeof (struct usb_hub_descriptor);
|
|
break;
|
|
}
|
|
status = hcd->driver->hub_control (hcd,
|
|
typeReq, wValue, wIndex,
|
|
tbuf, wLength);
|
|
break;
|
|
error:
|
|
/* "protocol stall" on error */
|
|
status = -EPIPE;
|
|
}
|
|
|
|
if (status) {
|
|
len = 0;
|
|
if (status != -EPIPE) {
|
|
dev_dbg (hcd->self.controller,
|
|
"CTRL: TypeReq=0x%x val=0x%x "
|
|
"idx=0x%x len=%d ==> %d\n",
|
|
typeReq, wValue, wIndex,
|
|
wLength, status);
|
|
}
|
|
}
|
|
if (len) {
|
|
if (urb->transfer_buffer_length < len)
|
|
len = urb->transfer_buffer_length;
|
|
urb->actual_length = len;
|
|
// always USB_DIR_IN, toward host
|
|
memcpy (ubuf, bufp, len);
|
|
|
|
/* report whether RH hardware supports remote wakeup */
|
|
if (patch_wakeup &&
|
|
len > offsetof (struct usb_config_descriptor,
|
|
bmAttributes))
|
|
((struct usb_config_descriptor *)ubuf)->bmAttributes
|
|
|= USB_CONFIG_ATT_WAKEUP;
|
|
|
|
/* report whether RH hardware has an integrated TT */
|
|
if (patch_protocol &&
|
|
len > offsetof(struct usb_device_descriptor,
|
|
bDeviceProtocol))
|
|
((struct usb_device_descriptor *) ubuf)->
|
|
bDeviceProtocol = 1;
|
|
}
|
|
|
|
/* any errors get returned through the urb completion */
|
|
spin_lock_irq(&hcd_root_hub_lock);
|
|
usb_hcd_unlink_urb_from_ep(hcd, urb);
|
|
|
|
/* This peculiar use of spinlocks echoes what real HC drivers do.
|
|
* Avoiding calls to local_irq_disable/enable makes the code
|
|
* RT-friendly.
|
|
*/
|
|
spin_unlock(&hcd_root_hub_lock);
|
|
usb_hcd_giveback_urb(hcd, urb, status);
|
|
spin_lock(&hcd_root_hub_lock);
|
|
|
|
spin_unlock_irq(&hcd_root_hub_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Root Hub interrupt transfers are polled using a timer if the
|
|
* driver requests it; otherwise the driver is responsible for
|
|
* calling usb_hcd_poll_rh_status() when an event occurs.
|
|
*
|
|
* Completions are called in_interrupt(), but they may or may not
|
|
* be in_irq().
|
|
*/
|
|
void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
|
|
{
|
|
struct urb *urb;
|
|
int length;
|
|
unsigned long flags;
|
|
char buffer[4]; /* Any root hubs with > 31 ports? */
|
|
|
|
if (unlikely(!hcd->rh_registered))
|
|
return;
|
|
if (!hcd->uses_new_polling && !hcd->status_urb)
|
|
return;
|
|
|
|
length = hcd->driver->hub_status_data(hcd, buffer);
|
|
if (length > 0) {
|
|
|
|
/* try to complete the status urb */
|
|
spin_lock_irqsave(&hcd_root_hub_lock, flags);
|
|
urb = hcd->status_urb;
|
|
if (urb) {
|
|
hcd->poll_pending = 0;
|
|
hcd->status_urb = NULL;
|
|
urb->actual_length = length;
|
|
memcpy(urb->transfer_buffer, buffer, length);
|
|
|
|
usb_hcd_unlink_urb_from_ep(hcd, urb);
|
|
spin_unlock(&hcd_root_hub_lock);
|
|
usb_hcd_giveback_urb(hcd, urb, 0);
|
|
spin_lock(&hcd_root_hub_lock);
|
|
} else {
|
|
length = 0;
|
|
hcd->poll_pending = 1;
|
|
}
|
|
spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
|
|
}
|
|
|
|
/* The USB 2.0 spec says 256 ms. This is close enough and won't
|
|
* exceed that limit if HZ is 100. The math is more clunky than
|
|
* maybe expected, this is to make sure that all timers for USB devices
|
|
* fire at the same time to give the CPU a break inbetween */
|
|
if (hcd->uses_new_polling ? hcd->poll_rh :
|
|
(length == 0 && hcd->status_urb != NULL))
|
|
mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
|
|
|
|
/* timer callback */
|
|
static void rh_timer_func (unsigned long _hcd)
|
|
{
|
|
usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
int retval;
|
|
unsigned long flags;
|
|
unsigned len = 1 + (urb->dev->maxchild / 8);
|
|
|
|
spin_lock_irqsave (&hcd_root_hub_lock, flags);
|
|
if (hcd->status_urb || urb->transfer_buffer_length < len) {
|
|
dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
retval = usb_hcd_link_urb_to_ep(hcd, urb);
|
|
if (retval)
|
|
goto done;
|
|
|
|
hcd->status_urb = urb;
|
|
urb->hcpriv = hcd; /* indicate it's queued */
|
|
if (!hcd->uses_new_polling)
|
|
mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
|
|
|
|
/* If a status change has already occurred, report it ASAP */
|
|
else if (hcd->poll_pending)
|
|
mod_timer(&hcd->rh_timer, jiffies);
|
|
retval = 0;
|
|
done:
|
|
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
if (usb_endpoint_xfer_int(&urb->ep->desc))
|
|
return rh_queue_status (hcd, urb);
|
|
if (usb_endpoint_xfer_control(&urb->ep->desc))
|
|
return rh_call_control (hcd, urb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* Unlinks of root-hub control URBs are legal, but they don't do anything
|
|
* since these URBs always execute synchronously.
|
|
*/
|
|
static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&hcd_root_hub_lock, flags);
|
|
rc = usb_hcd_check_unlink_urb(hcd, urb, status);
|
|
if (rc)
|
|
goto done;
|
|
|
|
if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
|
|
; /* Do nothing */
|
|
|
|
} else { /* Status URB */
|
|
if (!hcd->uses_new_polling)
|
|
del_timer (&hcd->rh_timer);
|
|
if (urb == hcd->status_urb) {
|
|
hcd->status_urb = NULL;
|
|
usb_hcd_unlink_urb_from_ep(hcd, urb);
|
|
|
|
spin_unlock(&hcd_root_hub_lock);
|
|
usb_hcd_giveback_urb(hcd, urb, status);
|
|
spin_lock(&hcd_root_hub_lock);
|
|
}
|
|
}
|
|
done:
|
|
spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Show & store the current value of authorized_default
|
|
*/
|
|
static ssize_t usb_host_authorized_default_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct usb_device *rh_usb_dev = to_usb_device(dev);
|
|
struct usb_bus *usb_bus = rh_usb_dev->bus;
|
|
struct usb_hcd *usb_hcd;
|
|
|
|
if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
|
|
return -ENODEV;
|
|
usb_hcd = bus_to_hcd(usb_bus);
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default);
|
|
}
|
|
|
|
static ssize_t usb_host_authorized_default_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t size)
|
|
{
|
|
ssize_t result;
|
|
unsigned val;
|
|
struct usb_device *rh_usb_dev = to_usb_device(dev);
|
|
struct usb_bus *usb_bus = rh_usb_dev->bus;
|
|
struct usb_hcd *usb_hcd;
|
|
|
|
if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
|
|
return -ENODEV;
|
|
usb_hcd = bus_to_hcd(usb_bus);
|
|
result = sscanf(buf, "%u\n", &val);
|
|
if (result == 1) {
|
|
usb_hcd->authorized_default = val? 1 : 0;
|
|
result = size;
|
|
}
|
|
else
|
|
result = -EINVAL;
|
|
return result;
|
|
}
|
|
|
|
static DEVICE_ATTR(authorized_default, 0644,
|
|
usb_host_authorized_default_show,
|
|
usb_host_authorized_default_store);
|
|
|
|
|
|
/* Group all the USB bus attributes */
|
|
static struct attribute *usb_bus_attrs[] = {
|
|
&dev_attr_authorized_default.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group usb_bus_attr_group = {
|
|
.name = NULL, /* we want them in the same directory */
|
|
.attrs = usb_bus_attrs,
|
|
};
|
|
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_bus_init - shared initialization code
|
|
* @bus: the bus structure being initialized
|
|
*
|
|
* This code is used to initialize a usb_bus structure, memory for which is
|
|
* separately managed.
|
|
*/
|
|
static void usb_bus_init (struct usb_bus *bus)
|
|
{
|
|
memset (&bus->devmap, 0, sizeof(struct usb_devmap));
|
|
|
|
bus->devnum_next = 1;
|
|
|
|
bus->root_hub = NULL;
|
|
bus->busnum = -1;
|
|
bus->bandwidth_allocated = 0;
|
|
bus->bandwidth_int_reqs = 0;
|
|
bus->bandwidth_isoc_reqs = 0;
|
|
|
|
INIT_LIST_HEAD (&bus->bus_list);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_register_bus - registers the USB host controller with the usb core
|
|
* @bus: pointer to the bus to register
|
|
* Context: !in_interrupt()
|
|
*
|
|
* Assigns a bus number, and links the controller into usbcore data
|
|
* structures so that it can be seen by scanning the bus list.
|
|
*/
|
|
static int usb_register_bus(struct usb_bus *bus)
|
|
{
|
|
int result = -E2BIG;
|
|
int busnum;
|
|
|
|
mutex_lock(&usb_bus_list_lock);
|
|
busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
|
|
if (busnum >= USB_MAXBUS) {
|
|
printk (KERN_ERR "%s: too many buses\n", usbcore_name);
|
|
goto error_find_busnum;
|
|
}
|
|
set_bit (busnum, busmap.busmap);
|
|
bus->busnum = busnum;
|
|
|
|
/* Add it to the local list of buses */
|
|
list_add (&bus->bus_list, &usb_bus_list);
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
|
|
usb_notify_add_bus(bus);
|
|
|
|
dev_info (bus->controller, "new USB bus registered, assigned bus "
|
|
"number %d\n", bus->busnum);
|
|
return 0;
|
|
|
|
error_find_busnum:
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* usb_deregister_bus - deregisters the USB host controller
|
|
* @bus: pointer to the bus to deregister
|
|
* Context: !in_interrupt()
|
|
*
|
|
* Recycles the bus number, and unlinks the controller from usbcore data
|
|
* structures so that it won't be seen by scanning the bus list.
|
|
*/
|
|
static void usb_deregister_bus (struct usb_bus *bus)
|
|
{
|
|
dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
|
|
|
|
/*
|
|
* NOTE: make sure that all the devices are removed by the
|
|
* controller code, as well as having it call this when cleaning
|
|
* itself up
|
|
*/
|
|
mutex_lock(&usb_bus_list_lock);
|
|
list_del (&bus->bus_list);
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
|
|
usb_notify_remove_bus(bus);
|
|
|
|
clear_bit (bus->busnum, busmap.busmap);
|
|
}
|
|
|
|
/**
|
|
* register_root_hub - called by usb_add_hcd() to register a root hub
|
|
* @hcd: host controller for this root hub
|
|
*
|
|
* This function registers the root hub with the USB subsystem. It sets up
|
|
* the device properly in the device tree and then calls usb_new_device()
|
|
* to register the usb device. It also assigns the root hub's USB address
|
|
* (always 1).
|
|
*/
|
|
static int register_root_hub(struct usb_hcd *hcd)
|
|
{
|
|
struct device *parent_dev = hcd->self.controller;
|
|
struct usb_device *usb_dev = hcd->self.root_hub;
|
|
const int devnum = 1;
|
|
int retval;
|
|
|
|
usb_dev->devnum = devnum;
|
|
usb_dev->bus->devnum_next = devnum + 1;
|
|
memset (&usb_dev->bus->devmap.devicemap, 0,
|
|
sizeof usb_dev->bus->devmap.devicemap);
|
|
set_bit (devnum, usb_dev->bus->devmap.devicemap);
|
|
usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
|
|
|
|
mutex_lock(&usb_bus_list_lock);
|
|
|
|
usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
|
|
retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
|
|
if (retval != sizeof usb_dev->descriptor) {
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
|
|
dev_name(&usb_dev->dev), retval);
|
|
return (retval < 0) ? retval : -EMSGSIZE;
|
|
}
|
|
|
|
retval = usb_new_device (usb_dev);
|
|
if (retval) {
|
|
dev_err (parent_dev, "can't register root hub for %s, %d\n",
|
|
dev_name(&usb_dev->dev), retval);
|
|
}
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
|
|
if (retval == 0) {
|
|
spin_lock_irq (&hcd_root_hub_lock);
|
|
hcd->rh_registered = 1;
|
|
spin_unlock_irq (&hcd_root_hub_lock);
|
|
|
|
/* Did the HC die before the root hub was registered? */
|
|
if (hcd->state == HC_STATE_HALT)
|
|
usb_hc_died (hcd); /* This time clean up */
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_calc_bus_time - approximate periodic transaction time in nanoseconds
|
|
* @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
|
|
* @is_input: true iff the transaction sends data to the host
|
|
* @isoc: true for isochronous transactions, false for interrupt ones
|
|
* @bytecount: how many bytes in the transaction.
|
|
*
|
|
* Returns approximate bus time in nanoseconds for a periodic transaction.
|
|
* See USB 2.0 spec section 5.11.3; only periodic transfers need to be
|
|
* scheduled in software, this function is only used for such scheduling.
|
|
*/
|
|
long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
switch (speed) {
|
|
case USB_SPEED_LOW: /* INTR only */
|
|
if (is_input) {
|
|
tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
|
|
return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
|
|
} else {
|
|
tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
|
|
return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
|
|
}
|
|
case USB_SPEED_FULL: /* ISOC or INTR */
|
|
if (isoc) {
|
|
tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
|
|
return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
|
|
} else {
|
|
tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
|
|
return (9107L + BW_HOST_DELAY + tmp);
|
|
}
|
|
case USB_SPEED_HIGH: /* ISOC or INTR */
|
|
// FIXME adjust for input vs output
|
|
if (isoc)
|
|
tmp = HS_NSECS_ISO (bytecount);
|
|
else
|
|
tmp = HS_NSECS (bytecount);
|
|
return tmp;
|
|
default:
|
|
pr_debug ("%s: bogus device speed!\n", usbcore_name);
|
|
return -1;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_calc_bus_time);
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Generic HC operations.
|
|
*/
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
|
|
* @hcd: host controller to which @urb was submitted
|
|
* @urb: URB being submitted
|
|
*
|
|
* Host controller drivers should call this routine in their enqueue()
|
|
* method. The HCD's private spinlock must be held and interrupts must
|
|
* be disabled. The actions carried out here are required for URB
|
|
* submission, as well as for endpoint shutdown and for usb_kill_urb.
|
|
*
|
|
* Returns 0 for no error, otherwise a negative error code (in which case
|
|
* the enqueue() method must fail). If no error occurs but enqueue() fails
|
|
* anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
|
|
* the private spinlock and returning.
|
|
*/
|
|
int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
int rc = 0;
|
|
|
|
spin_lock(&hcd_urb_list_lock);
|
|
|
|
/* Check that the URB isn't being killed */
|
|
if (unlikely(atomic_read(&urb->reject))) {
|
|
rc = -EPERM;
|
|
goto done;
|
|
}
|
|
|
|
if (unlikely(!urb->ep->enabled)) {
|
|
rc = -ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
if (unlikely(!urb->dev->can_submit)) {
|
|
rc = -EHOSTUNREACH;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Check the host controller's state and add the URB to the
|
|
* endpoint's queue.
|
|
*/
|
|
switch (hcd->state) {
|
|
case HC_STATE_RUNNING:
|
|
case HC_STATE_RESUMING:
|
|
urb->unlinked = 0;
|
|
list_add_tail(&urb->urb_list, &urb->ep->urb_list);
|
|
break;
|
|
default:
|
|
rc = -ESHUTDOWN;
|
|
goto done;
|
|
}
|
|
done:
|
|
spin_unlock(&hcd_urb_list_lock);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
|
|
|
|
/**
|
|
* usb_hcd_check_unlink_urb - check whether an URB may be unlinked
|
|
* @hcd: host controller to which @urb was submitted
|
|
* @urb: URB being checked for unlinkability
|
|
* @status: error code to store in @urb if the unlink succeeds
|
|
*
|
|
* Host controller drivers should call this routine in their dequeue()
|
|
* method. The HCD's private spinlock must be held and interrupts must
|
|
* be disabled. The actions carried out here are required for making
|
|
* sure than an unlink is valid.
|
|
*
|
|
* Returns 0 for no error, otherwise a negative error code (in which case
|
|
* the dequeue() method must fail). The possible error codes are:
|
|
*
|
|
* -EIDRM: @urb was not submitted or has already completed.
|
|
* The completion function may not have been called yet.
|
|
*
|
|
* -EBUSY: @urb has already been unlinked.
|
|
*/
|
|
int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
|
|
int status)
|
|
{
|
|
struct list_head *tmp;
|
|
|
|
/* insist the urb is still queued */
|
|
list_for_each(tmp, &urb->ep->urb_list) {
|
|
if (tmp == &urb->urb_list)
|
|
break;
|
|
}
|
|
if (tmp != &urb->urb_list)
|
|
return -EIDRM;
|
|
|
|
/* Any status except -EINPROGRESS means something already started to
|
|
* unlink this URB from the hardware. So there's no more work to do.
|
|
*/
|
|
if (urb->unlinked)
|
|
return -EBUSY;
|
|
urb->unlinked = status;
|
|
|
|
/* IRQ setup can easily be broken so that USB controllers
|
|
* never get completion IRQs ... maybe even the ones we need to
|
|
* finish unlinking the initial failed usb_set_address()
|
|
* or device descriptor fetch.
|
|
*/
|
|
if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags) &&
|
|
!is_root_hub(urb->dev)) {
|
|
dev_warn(hcd->self.controller, "Unlink after no-IRQ? "
|
|
"Controller is probably using the wrong IRQ.\n");
|
|
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
|
|
|
|
/**
|
|
* usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
|
|
* @hcd: host controller to which @urb was submitted
|
|
* @urb: URB being unlinked
|
|
*
|
|
* Host controller drivers should call this routine before calling
|
|
* usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
|
|
* interrupts must be disabled. The actions carried out here are required
|
|
* for URB completion.
|
|
*/
|
|
void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
/* clear all state linking urb to this dev (and hcd) */
|
|
spin_lock(&hcd_urb_list_lock);
|
|
list_del_init(&urb->urb_list);
|
|
spin_unlock(&hcd_urb_list_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
|
|
|
|
/*
|
|
* Some usb host controllers can only perform dma using a small SRAM area.
|
|
* The usb core itself is however optimized for host controllers that can dma
|
|
* using regular system memory - like pci devices doing bus mastering.
|
|
*
|
|
* To support host controllers with limited dma capabilites we provide dma
|
|
* bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
|
|
* For this to work properly the host controller code must first use the
|
|
* function dma_declare_coherent_memory() to point out which memory area
|
|
* that should be used for dma allocations.
|
|
*
|
|
* The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
|
|
* dma using dma_alloc_coherent() which in turn allocates from the memory
|
|
* area pointed out with dma_declare_coherent_memory().
|
|
*
|
|
* So, to summarize...
|
|
*
|
|
* - We need "local" memory, canonical example being
|
|
* a small SRAM on a discrete controller being the
|
|
* only memory that the controller can read ...
|
|
* (a) "normal" kernel memory is no good, and
|
|
* (b) there's not enough to share
|
|
*
|
|
* - The only *portable* hook for such stuff in the
|
|
* DMA framework is dma_declare_coherent_memory()
|
|
*
|
|
* - So we use that, even though the primary requirement
|
|
* is that the memory be "local" (hence addressible
|
|
* by that device), not "coherent".
|
|
*
|
|
*/
|
|
|
|
static int hcd_alloc_coherent(struct usb_bus *bus,
|
|
gfp_t mem_flags, dma_addr_t *dma_handle,
|
|
void **vaddr_handle, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
unsigned char *vaddr;
|
|
|
|
vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
|
|
mem_flags, dma_handle);
|
|
if (!vaddr)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Store the virtual address of the buffer at the end
|
|
* of the allocated dma buffer. The size of the buffer
|
|
* may be uneven so use unaligned functions instead
|
|
* of just rounding up. It makes sense to optimize for
|
|
* memory footprint over access speed since the amount
|
|
* of memory available for dma may be limited.
|
|
*/
|
|
put_unaligned((unsigned long)*vaddr_handle,
|
|
(unsigned long *)(vaddr + size));
|
|
|
|
if (dir == DMA_TO_DEVICE)
|
|
memcpy(vaddr, *vaddr_handle, size);
|
|
|
|
*vaddr_handle = vaddr;
|
|
return 0;
|
|
}
|
|
|
|
static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
|
|
void **vaddr_handle, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
unsigned char *vaddr = *vaddr_handle;
|
|
|
|
vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
|
|
|
|
if (dir == DMA_FROM_DEVICE)
|
|
memcpy(vaddr, *vaddr_handle, size);
|
|
|
|
hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
|
|
|
|
*vaddr_handle = vaddr;
|
|
*dma_handle = 0;
|
|
}
|
|
|
|
static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
|
|
gfp_t mem_flags)
|
|
{
|
|
enum dma_data_direction dir;
|
|
int ret = 0;
|
|
|
|
/* Map the URB's buffers for DMA access.
|
|
* Lower level HCD code should use *_dma exclusively,
|
|
* unless it uses pio or talks to another transport,
|
|
* or uses the provided scatter gather list for bulk.
|
|
*/
|
|
if (is_root_hub(urb->dev))
|
|
return 0;
|
|
|
|
if (usb_endpoint_xfer_control(&urb->ep->desc)
|
|
&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) {
|
|
if (hcd->self.uses_dma)
|
|
urb->setup_dma = dma_map_single(
|
|
hcd->self.controller,
|
|
urb->setup_packet,
|
|
sizeof(struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
else if (hcd->driver->flags & HCD_LOCAL_MEM)
|
|
ret = hcd_alloc_coherent(
|
|
urb->dev->bus, mem_flags,
|
|
&urb->setup_dma,
|
|
(void **)&urb->setup_packet,
|
|
sizeof(struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
}
|
|
|
|
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
|
|
if (ret == 0 && urb->transfer_buffer_length != 0
|
|
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
|
|
if (hcd->self.uses_dma)
|
|
urb->transfer_dma = dma_map_single (
|
|
hcd->self.controller,
|
|
urb->transfer_buffer,
|
|
urb->transfer_buffer_length,
|
|
dir);
|
|
else if (hcd->driver->flags & HCD_LOCAL_MEM) {
|
|
ret = hcd_alloc_coherent(
|
|
urb->dev->bus, mem_flags,
|
|
&urb->transfer_dma,
|
|
&urb->transfer_buffer,
|
|
urb->transfer_buffer_length,
|
|
dir);
|
|
|
|
if (ret && usb_endpoint_xfer_control(&urb->ep->desc)
|
|
&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
|
|
hcd_free_coherent(urb->dev->bus,
|
|
&urb->setup_dma,
|
|
(void **)&urb->setup_packet,
|
|
sizeof(struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
enum dma_data_direction dir;
|
|
|
|
if (is_root_hub(urb->dev))
|
|
return;
|
|
|
|
if (usb_endpoint_xfer_control(&urb->ep->desc)
|
|
&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) {
|
|
if (hcd->self.uses_dma)
|
|
dma_unmap_single(hcd->self.controller, urb->setup_dma,
|
|
sizeof(struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
else if (hcd->driver->flags & HCD_LOCAL_MEM)
|
|
hcd_free_coherent(urb->dev->bus, &urb->setup_dma,
|
|
(void **)&urb->setup_packet,
|
|
sizeof(struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
}
|
|
|
|
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
|
|
if (urb->transfer_buffer_length != 0
|
|
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
|
|
if (hcd->self.uses_dma)
|
|
dma_unmap_single(hcd->self.controller,
|
|
urb->transfer_dma,
|
|
urb->transfer_buffer_length,
|
|
dir);
|
|
else if (hcd->driver->flags & HCD_LOCAL_MEM)
|
|
hcd_free_coherent(urb->dev->bus, &urb->transfer_dma,
|
|
&urb->transfer_buffer,
|
|
urb->transfer_buffer_length,
|
|
dir);
|
|
}
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* may be called in any context with a valid urb->dev usecount
|
|
* caller surrenders "ownership" of urb
|
|
* expects usb_submit_urb() to have sanity checked and conditioned all
|
|
* inputs in the urb
|
|
*/
|
|
int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
|
|
{
|
|
int status;
|
|
struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
|
|
|
|
/* increment urb's reference count as part of giving it to the HCD
|
|
* (which will control it). HCD guarantees that it either returns
|
|
* an error or calls giveback(), but not both.
|
|
*/
|
|
usb_get_urb(urb);
|
|
atomic_inc(&urb->use_count);
|
|
atomic_inc(&urb->dev->urbnum);
|
|
usbmon_urb_submit(&hcd->self, urb);
|
|
|
|
/* NOTE requirements on root-hub callers (usbfs and the hub
|
|
* driver, for now): URBs' urb->transfer_buffer must be
|
|
* valid and usb_buffer_{sync,unmap}() not be needed, since
|
|
* they could clobber root hub response data. Also, control
|
|
* URBs must be submitted in process context with interrupts
|
|
* enabled.
|
|
*/
|
|
status = map_urb_for_dma(hcd, urb, mem_flags);
|
|
if (unlikely(status)) {
|
|
usbmon_urb_submit_error(&hcd->self, urb, status);
|
|
goto error;
|
|
}
|
|
|
|
if (is_root_hub(urb->dev))
|
|
status = rh_urb_enqueue(hcd, urb);
|
|
else
|
|
status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
|
|
|
|
if (unlikely(status)) {
|
|
usbmon_urb_submit_error(&hcd->self, urb, status);
|
|
unmap_urb_for_dma(hcd, urb);
|
|
error:
|
|
urb->hcpriv = NULL;
|
|
INIT_LIST_HEAD(&urb->urb_list);
|
|
atomic_dec(&urb->use_count);
|
|
atomic_dec(&urb->dev->urbnum);
|
|
if (atomic_read(&urb->reject))
|
|
wake_up(&usb_kill_urb_queue);
|
|
usb_put_urb(urb);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* this makes the hcd giveback() the urb more quickly, by kicking it
|
|
* off hardware queues (which may take a while) and returning it as
|
|
* soon as practical. we've already set up the urb's return status,
|
|
* but we can't know if the callback completed already.
|
|
*/
|
|
static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
|
|
{
|
|
int value;
|
|
|
|
if (is_root_hub(urb->dev))
|
|
value = usb_rh_urb_dequeue(hcd, urb, status);
|
|
else {
|
|
|
|
/* The only reason an HCD might fail this call is if
|
|
* it has not yet fully queued the urb to begin with.
|
|
* Such failures should be harmless. */
|
|
value = hcd->driver->urb_dequeue(hcd, urb, status);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
/*
|
|
* called in any context
|
|
*
|
|
* caller guarantees urb won't be recycled till both unlink()
|
|
* and the urb's completion function return
|
|
*/
|
|
int usb_hcd_unlink_urb (struct urb *urb, int status)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
int retval = -EIDRM;
|
|
unsigned long flags;
|
|
|
|
/* Prevent the device and bus from going away while
|
|
* the unlink is carried out. If they are already gone
|
|
* then urb->use_count must be 0, since disconnected
|
|
* devices can't have any active URBs.
|
|
*/
|
|
spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
|
|
if (atomic_read(&urb->use_count) > 0) {
|
|
retval = 0;
|
|
usb_get_dev(urb->dev);
|
|
}
|
|
spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
|
|
if (retval == 0) {
|
|
hcd = bus_to_hcd(urb->dev->bus);
|
|
retval = unlink1(hcd, urb, status);
|
|
usb_put_dev(urb->dev);
|
|
}
|
|
|
|
if (retval == 0)
|
|
retval = -EINPROGRESS;
|
|
else if (retval != -EIDRM && retval != -EBUSY)
|
|
dev_dbg(&urb->dev->dev, "hcd_unlink_urb %p fail %d\n",
|
|
urb, retval);
|
|
return retval;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_hcd_giveback_urb - return URB from HCD to device driver
|
|
* @hcd: host controller returning the URB
|
|
* @urb: urb being returned to the USB device driver.
|
|
* @status: completion status code for the URB.
|
|
* Context: in_interrupt()
|
|
*
|
|
* This hands the URB from HCD to its USB device driver, using its
|
|
* completion function. The HCD has freed all per-urb resources
|
|
* (and is done using urb->hcpriv). It also released all HCD locks;
|
|
* the device driver won't cause problems if it frees, modifies,
|
|
* or resubmits this URB.
|
|
*
|
|
* If @urb was unlinked, the value of @status will be overridden by
|
|
* @urb->unlinked. Erroneous short transfers are detected in case
|
|
* the HCD hasn't checked for them.
|
|
*/
|
|
void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
|
|
{
|
|
urb->hcpriv = NULL;
|
|
if (unlikely(urb->unlinked))
|
|
status = urb->unlinked;
|
|
else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
|
|
urb->actual_length < urb->transfer_buffer_length &&
|
|
!status))
|
|
status = -EREMOTEIO;
|
|
|
|
unmap_urb_for_dma(hcd, urb);
|
|
usbmon_urb_complete(&hcd->self, urb, status);
|
|
usb_unanchor_urb(urb);
|
|
|
|
/* pass ownership to the completion handler */
|
|
urb->status = status;
|
|
urb->complete (urb);
|
|
atomic_dec (&urb->use_count);
|
|
if (unlikely(atomic_read(&urb->reject)))
|
|
wake_up (&usb_kill_urb_queue);
|
|
usb_put_urb (urb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* Cancel all URBs pending on this endpoint and wait for the endpoint's
|
|
* queue to drain completely. The caller must first insure that no more
|
|
* URBs can be submitted for this endpoint.
|
|
*/
|
|
void usb_hcd_flush_endpoint(struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
struct urb *urb;
|
|
|
|
if (!ep)
|
|
return;
|
|
might_sleep();
|
|
hcd = bus_to_hcd(udev->bus);
|
|
|
|
/* No more submits can occur */
|
|
spin_lock_irq(&hcd_urb_list_lock);
|
|
rescan:
|
|
list_for_each_entry (urb, &ep->urb_list, urb_list) {
|
|
int is_in;
|
|
|
|
if (urb->unlinked)
|
|
continue;
|
|
usb_get_urb (urb);
|
|
is_in = usb_urb_dir_in(urb);
|
|
spin_unlock(&hcd_urb_list_lock);
|
|
|
|
/* kick hcd */
|
|
unlink1(hcd, urb, -ESHUTDOWN);
|
|
dev_dbg (hcd->self.controller,
|
|
"shutdown urb %p ep%d%s%s\n",
|
|
urb, usb_endpoint_num(&ep->desc),
|
|
is_in ? "in" : "out",
|
|
({ char *s;
|
|
|
|
switch (usb_endpoint_type(&ep->desc)) {
|
|
case USB_ENDPOINT_XFER_CONTROL:
|
|
s = ""; break;
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
s = "-bulk"; break;
|
|
case USB_ENDPOINT_XFER_INT:
|
|
s = "-intr"; break;
|
|
default:
|
|
s = "-iso"; break;
|
|
};
|
|
s;
|
|
}));
|
|
usb_put_urb (urb);
|
|
|
|
/* list contents may have changed */
|
|
spin_lock(&hcd_urb_list_lock);
|
|
goto rescan;
|
|
}
|
|
spin_unlock_irq(&hcd_urb_list_lock);
|
|
|
|
/* Wait until the endpoint queue is completely empty */
|
|
while (!list_empty (&ep->urb_list)) {
|
|
spin_lock_irq(&hcd_urb_list_lock);
|
|
|
|
/* The list may have changed while we acquired the spinlock */
|
|
urb = NULL;
|
|
if (!list_empty (&ep->urb_list)) {
|
|
urb = list_entry (ep->urb_list.prev, struct urb,
|
|
urb_list);
|
|
usb_get_urb (urb);
|
|
}
|
|
spin_unlock_irq(&hcd_urb_list_lock);
|
|
|
|
if (urb) {
|
|
usb_kill_urb (urb);
|
|
usb_put_urb (urb);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check whether a new configuration or alt setting for an interface
|
|
* will exceed the bandwidth for the bus (or the host controller resources).
|
|
* Only pass in a non-NULL config or interface, not both!
|
|
* Passing NULL for both new_config and new_intf means the device will be
|
|
* de-configured by issuing a set configuration 0 command.
|
|
*/
|
|
int usb_hcd_check_bandwidth(struct usb_device *udev,
|
|
struct usb_host_config *new_config,
|
|
struct usb_interface *new_intf)
|
|
{
|
|
int num_intfs, i, j;
|
|
struct usb_interface_cache *intf_cache;
|
|
struct usb_host_interface *alt = 0;
|
|
int ret = 0;
|
|
struct usb_hcd *hcd;
|
|
struct usb_host_endpoint *ep;
|
|
|
|
hcd = bus_to_hcd(udev->bus);
|
|
if (!hcd->driver->check_bandwidth)
|
|
return 0;
|
|
|
|
/* Configuration is being removed - set configuration 0 */
|
|
if (!new_config && !new_intf) {
|
|
for (i = 1; i < 16; ++i) {
|
|
ep = udev->ep_out[i];
|
|
if (ep)
|
|
hcd->driver->drop_endpoint(hcd, udev, ep);
|
|
ep = udev->ep_in[i];
|
|
if (ep)
|
|
hcd->driver->drop_endpoint(hcd, udev, ep);
|
|
}
|
|
hcd->driver->check_bandwidth(hcd, udev);
|
|
return 0;
|
|
}
|
|
/* Check if the HCD says there's enough bandwidth. Enable all endpoints
|
|
* each interface's alt setting 0 and ask the HCD to check the bandwidth
|
|
* of the bus. There will always be bandwidth for endpoint 0, so it's
|
|
* ok to exclude it.
|
|
*/
|
|
if (new_config) {
|
|
num_intfs = new_config->desc.bNumInterfaces;
|
|
/* Remove endpoints (except endpoint 0, which is always on the
|
|
* schedule) from the old config from the schedule
|
|
*/
|
|
for (i = 1; i < 16; ++i) {
|
|
ep = udev->ep_out[i];
|
|
if (ep) {
|
|
ret = hcd->driver->drop_endpoint(hcd, udev, ep);
|
|
if (ret < 0)
|
|
goto reset;
|
|
}
|
|
ep = udev->ep_in[i];
|
|
if (ep) {
|
|
ret = hcd->driver->drop_endpoint(hcd, udev, ep);
|
|
if (ret < 0)
|
|
goto reset;
|
|
}
|
|
}
|
|
for (i = 0; i < num_intfs; ++i) {
|
|
|
|
/* Dig the endpoints for alt setting 0 out of the
|
|
* interface cache for this interface
|
|
*/
|
|
intf_cache = new_config->intf_cache[i];
|
|
for (j = 0; j < intf_cache->num_altsetting; j++) {
|
|
if (intf_cache->altsetting[j].desc.bAlternateSetting == 0)
|
|
alt = &intf_cache->altsetting[j];
|
|
}
|
|
if (!alt) {
|
|
printk(KERN_DEBUG "Did not find alt setting 0 for intf %d\n", i);
|
|
continue;
|
|
}
|
|
for (j = 0; j < alt->desc.bNumEndpoints; j++) {
|
|
ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
|
|
if (ret < 0)
|
|
goto reset;
|
|
}
|
|
}
|
|
}
|
|
ret = hcd->driver->check_bandwidth(hcd, udev);
|
|
reset:
|
|
if (ret < 0)
|
|
hcd->driver->reset_bandwidth(hcd, udev);
|
|
return ret;
|
|
}
|
|
|
|
/* Disables the endpoint: synchronizes with the hcd to make sure all
|
|
* endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
|
|
* have been called previously. Use for set_configuration, set_interface,
|
|
* driver removal, physical disconnect.
|
|
*
|
|
* example: a qh stored in ep->hcpriv, holding state related to endpoint
|
|
* type, maxpacket size, toggle, halt status, and scheduling.
|
|
*/
|
|
void usb_hcd_disable_endpoint(struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
|
|
might_sleep();
|
|
hcd = bus_to_hcd(udev->bus);
|
|
if (hcd->driver->endpoint_disable)
|
|
hcd->driver->endpoint_disable(hcd, ep);
|
|
}
|
|
|
|
/**
|
|
* usb_hcd_reset_endpoint - reset host endpoint state
|
|
* @udev: USB device.
|
|
* @ep: the endpoint to reset.
|
|
*
|
|
* Resets any host endpoint state such as the toggle bit, sequence
|
|
* number and current window.
|
|
*/
|
|
void usb_hcd_reset_endpoint(struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
if (hcd->driver->endpoint_reset)
|
|
hcd->driver->endpoint_reset(hcd, ep);
|
|
else {
|
|
int epnum = usb_endpoint_num(&ep->desc);
|
|
int is_out = usb_endpoint_dir_out(&ep->desc);
|
|
int is_control = usb_endpoint_xfer_control(&ep->desc);
|
|
|
|
usb_settoggle(udev, epnum, is_out, 0);
|
|
if (is_control)
|
|
usb_settoggle(udev, epnum, !is_out, 0);
|
|
}
|
|
}
|
|
|
|
/* Protect against drivers that try to unlink URBs after the device
|
|
* is gone, by waiting until all unlinks for @udev are finished.
|
|
* Since we don't currently track URBs by device, simply wait until
|
|
* nothing is running in the locked region of usb_hcd_unlink_urb().
|
|
*/
|
|
void usb_hcd_synchronize_unlinks(struct usb_device *udev)
|
|
{
|
|
spin_lock_irq(&hcd_urb_unlink_lock);
|
|
spin_unlock_irq(&hcd_urb_unlink_lock);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* called in any context */
|
|
int usb_hcd_get_frame_number (struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
if (!HC_IS_RUNNING (hcd->state))
|
|
return -ESHUTDOWN;
|
|
return hcd->driver->get_frame_number (hcd);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
|
|
{
|
|
struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
|
|
int status;
|
|
int old_state = hcd->state;
|
|
|
|
dev_dbg(&rhdev->dev, "bus %s%s\n",
|
|
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
|
|
if (!hcd->driver->bus_suspend) {
|
|
status = -ENOENT;
|
|
} else {
|
|
hcd->state = HC_STATE_QUIESCING;
|
|
status = hcd->driver->bus_suspend(hcd);
|
|
}
|
|
if (status == 0) {
|
|
usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
|
|
hcd->state = HC_STATE_SUSPENDED;
|
|
} else {
|
|
hcd->state = old_state;
|
|
dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
|
|
"suspend", status);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
|
|
{
|
|
struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
|
|
int status;
|
|
int old_state = hcd->state;
|
|
|
|
dev_dbg(&rhdev->dev, "usb %s%s\n",
|
|
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
|
|
if (!hcd->driver->bus_resume)
|
|
return -ENOENT;
|
|
if (hcd->state == HC_STATE_RUNNING)
|
|
return 0;
|
|
|
|
hcd->state = HC_STATE_RESUMING;
|
|
status = hcd->driver->bus_resume(hcd);
|
|
if (status == 0) {
|
|
/* TRSMRCY = 10 msec */
|
|
msleep(10);
|
|
usb_set_device_state(rhdev, rhdev->actconfig
|
|
? USB_STATE_CONFIGURED
|
|
: USB_STATE_ADDRESS);
|
|
hcd->state = HC_STATE_RUNNING;
|
|
} else {
|
|
hcd->state = old_state;
|
|
dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
|
|
"resume", status);
|
|
if (status != -ESHUTDOWN)
|
|
usb_hc_died(hcd);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/* Workqueue routine for root-hub remote wakeup */
|
|
static void hcd_resume_work(struct work_struct *work)
|
|
{
|
|
struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
|
|
struct usb_device *udev = hcd->self.root_hub;
|
|
|
|
usb_lock_device(udev);
|
|
usb_mark_last_busy(udev);
|
|
usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
|
|
usb_unlock_device(udev);
|
|
}
|
|
|
|
/**
|
|
* usb_hcd_resume_root_hub - called by HCD to resume its root hub
|
|
* @hcd: host controller for this root hub
|
|
*
|
|
* The USB host controller calls this function when its root hub is
|
|
* suspended (with the remote wakeup feature enabled) and a remote
|
|
* wakeup request is received. The routine submits a workqueue request
|
|
* to resume the root hub (that is, manage its downstream ports again).
|
|
*/
|
|
void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave (&hcd_root_hub_lock, flags);
|
|
if (hcd->rh_registered)
|
|
queue_work(ksuspend_usb_wq, &hcd->wakeup_work);
|
|
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
|
|
|
|
#endif
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#ifdef CONFIG_USB_OTG
|
|
|
|
/**
|
|
* usb_bus_start_enum - start immediate enumeration (for OTG)
|
|
* @bus: the bus (must use hcd framework)
|
|
* @port_num: 1-based number of port; usually bus->otg_port
|
|
* Context: in_interrupt()
|
|
*
|
|
* Starts enumeration, with an immediate reset followed later by
|
|
* khubd identifying and possibly configuring the device.
|
|
* This is needed by OTG controller drivers, where it helps meet
|
|
* HNP protocol timing requirements for starting a port reset.
|
|
*/
|
|
int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
int status = -EOPNOTSUPP;
|
|
|
|
/* NOTE: since HNP can't start by grabbing the bus's address0_sem,
|
|
* boards with root hubs hooked up to internal devices (instead of
|
|
* just the OTG port) may need more attention to resetting...
|
|
*/
|
|
hcd = container_of (bus, struct usb_hcd, self);
|
|
if (port_num && hcd->driver->start_port_reset)
|
|
status = hcd->driver->start_port_reset(hcd, port_num);
|
|
|
|
/* run khubd shortly after (first) root port reset finishes;
|
|
* it may issue others, until at least 50 msecs have passed.
|
|
*/
|
|
if (status == 0)
|
|
mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_bus_start_enum);
|
|
|
|
#endif
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_hcd_irq - hook IRQs to HCD framework (bus glue)
|
|
* @irq: the IRQ being raised
|
|
* @__hcd: pointer to the HCD whose IRQ is being signaled
|
|
*
|
|
* If the controller isn't HALTed, calls the driver's irq handler.
|
|
* Checks whether the controller is now dead.
|
|
*/
|
|
irqreturn_t usb_hcd_irq (int irq, void *__hcd)
|
|
{
|
|
struct usb_hcd *hcd = __hcd;
|
|
unsigned long flags;
|
|
irqreturn_t rc;
|
|
|
|
/* IRQF_DISABLED doesn't work correctly with shared IRQs
|
|
* when the first handler doesn't use it. So let's just
|
|
* assume it's never used.
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
if (unlikely(hcd->state == HC_STATE_HALT ||
|
|
!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
|
|
rc = IRQ_NONE;
|
|
} else if (hcd->driver->irq(hcd) == IRQ_NONE) {
|
|
rc = IRQ_NONE;
|
|
} else {
|
|
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
|
|
|
|
if (unlikely(hcd->state == HC_STATE_HALT))
|
|
usb_hc_died(hcd);
|
|
rc = IRQ_HANDLED;
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
return rc;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_hc_died - report abnormal shutdown of a host controller (bus glue)
|
|
* @hcd: pointer to the HCD representing the controller
|
|
*
|
|
* This is called by bus glue to report a USB host controller that died
|
|
* while operations may still have been pending. It's called automatically
|
|
* by the PCI glue, so only glue for non-PCI busses should need to call it.
|
|
*/
|
|
void usb_hc_died (struct usb_hcd *hcd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
dev_err (hcd->self.controller, "HC died; cleaning up\n");
|
|
|
|
spin_lock_irqsave (&hcd_root_hub_lock, flags);
|
|
if (hcd->rh_registered) {
|
|
hcd->poll_rh = 0;
|
|
|
|
/* make khubd clean up old urbs and devices */
|
|
usb_set_device_state (hcd->self.root_hub,
|
|
USB_STATE_NOTATTACHED);
|
|
usb_kick_khubd (hcd->self.root_hub);
|
|
}
|
|
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL (usb_hc_died);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_create_hcd - create and initialize an HCD structure
|
|
* @driver: HC driver that will use this hcd
|
|
* @dev: device for this HC, stored in hcd->self.controller
|
|
* @bus_name: value to store in hcd->self.bus_name
|
|
* Context: !in_interrupt()
|
|
*
|
|
* Allocate a struct usb_hcd, with extra space at the end for the
|
|
* HC driver's private data. Initialize the generic members of the
|
|
* hcd structure.
|
|
*
|
|
* If memory is unavailable, returns NULL.
|
|
*/
|
|
struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
|
|
struct device *dev, const char *bus_name)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
|
|
hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
|
|
if (!hcd) {
|
|
dev_dbg (dev, "hcd alloc failed\n");
|
|
return NULL;
|
|
}
|
|
dev_set_drvdata(dev, hcd);
|
|
kref_init(&hcd->kref);
|
|
|
|
usb_bus_init(&hcd->self);
|
|
hcd->self.controller = dev;
|
|
hcd->self.bus_name = bus_name;
|
|
hcd->self.uses_dma = (dev->dma_mask != NULL);
|
|
|
|
init_timer(&hcd->rh_timer);
|
|
hcd->rh_timer.function = rh_timer_func;
|
|
hcd->rh_timer.data = (unsigned long) hcd;
|
|
#ifdef CONFIG_PM
|
|
INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
|
|
#endif
|
|
|
|
hcd->driver = driver;
|
|
hcd->product_desc = (driver->product_desc) ? driver->product_desc :
|
|
"USB Host Controller";
|
|
return hcd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_create_hcd);
|
|
|
|
static void hcd_release (struct kref *kref)
|
|
{
|
|
struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
|
|
|
|
kfree(hcd);
|
|
}
|
|
|
|
struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
|
|
{
|
|
if (hcd)
|
|
kref_get (&hcd->kref);
|
|
return hcd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_get_hcd);
|
|
|
|
void usb_put_hcd (struct usb_hcd *hcd)
|
|
{
|
|
if (hcd)
|
|
kref_put (&hcd->kref, hcd_release);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_put_hcd);
|
|
|
|
/**
|
|
* usb_add_hcd - finish generic HCD structure initialization and register
|
|
* @hcd: the usb_hcd structure to initialize
|
|
* @irqnum: Interrupt line to allocate
|
|
* @irqflags: Interrupt type flags
|
|
*
|
|
* Finish the remaining parts of generic HCD initialization: allocate the
|
|
* buffers of consistent memory, register the bus, request the IRQ line,
|
|
* and call the driver's reset() and start() routines.
|
|
*/
|
|
int usb_add_hcd(struct usb_hcd *hcd,
|
|
unsigned int irqnum, unsigned long irqflags)
|
|
{
|
|
int retval;
|
|
struct usb_device *rhdev;
|
|
|
|
dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
|
|
|
|
hcd->authorized_default = hcd->wireless? 0 : 1;
|
|
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
|
|
|
|
/* HC is in reset state, but accessible. Now do the one-time init,
|
|
* bottom up so that hcds can customize the root hubs before khubd
|
|
* starts talking to them. (Note, bus id is assigned early too.)
|
|
*/
|
|
if ((retval = hcd_buffer_create(hcd)) != 0) {
|
|
dev_dbg(hcd->self.controller, "pool alloc failed\n");
|
|
return retval;
|
|
}
|
|
|
|
if ((retval = usb_register_bus(&hcd->self)) < 0)
|
|
goto err_register_bus;
|
|
|
|
if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
|
|
dev_err(hcd->self.controller, "unable to allocate root hub\n");
|
|
retval = -ENOMEM;
|
|
goto err_allocate_root_hub;
|
|
}
|
|
|
|
switch (hcd->driver->flags & HCD_MASK) {
|
|
case HCD_USB11:
|
|
rhdev->speed = USB_SPEED_FULL;
|
|
break;
|
|
case HCD_USB2:
|
|
rhdev->speed = USB_SPEED_HIGH;
|
|
break;
|
|
case HCD_USB3:
|
|
rhdev->speed = USB_SPEED_SUPER;
|
|
break;
|
|
default:
|
|
goto err_allocate_root_hub;
|
|
}
|
|
hcd->self.root_hub = rhdev;
|
|
|
|
/* wakeup flag init defaults to "everything works" for root hubs,
|
|
* but drivers can override it in reset() if needed, along with
|
|
* recording the overall controller's system wakeup capability.
|
|
*/
|
|
device_init_wakeup(&rhdev->dev, 1);
|
|
|
|
/* "reset" is misnamed; its role is now one-time init. the controller
|
|
* should already have been reset (and boot firmware kicked off etc).
|
|
*/
|
|
if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
|
|
dev_err(hcd->self.controller, "can't setup\n");
|
|
goto err_hcd_driver_setup;
|
|
}
|
|
|
|
/* NOTE: root hub and controller capabilities may not be the same */
|
|
if (device_can_wakeup(hcd->self.controller)
|
|
&& device_can_wakeup(&hcd->self.root_hub->dev))
|
|
dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
|
|
|
|
/* enable irqs just before we start the controller */
|
|
if (hcd->driver->irq) {
|
|
|
|
/* IRQF_DISABLED doesn't work as advertised when used together
|
|
* with IRQF_SHARED. As usb_hcd_irq() will always disable
|
|
* interrupts we can remove it here.
|
|
*/
|
|
if (irqflags & IRQF_SHARED)
|
|
irqflags &= ~IRQF_DISABLED;
|
|
|
|
snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
|
|
hcd->driver->description, hcd->self.busnum);
|
|
if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
|
|
hcd->irq_descr, hcd)) != 0) {
|
|
dev_err(hcd->self.controller,
|
|
"request interrupt %d failed\n", irqnum);
|
|
goto err_request_irq;
|
|
}
|
|
hcd->irq = irqnum;
|
|
dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
|
|
(hcd->driver->flags & HCD_MEMORY) ?
|
|
"io mem" : "io base",
|
|
(unsigned long long)hcd->rsrc_start);
|
|
} else {
|
|
hcd->irq = -1;
|
|
if (hcd->rsrc_start)
|
|
dev_info(hcd->self.controller, "%s 0x%08llx\n",
|
|
(hcd->driver->flags & HCD_MEMORY) ?
|
|
"io mem" : "io base",
|
|
(unsigned long long)hcd->rsrc_start);
|
|
}
|
|
|
|
if ((retval = hcd->driver->start(hcd)) < 0) {
|
|
dev_err(hcd->self.controller, "startup error %d\n", retval);
|
|
goto err_hcd_driver_start;
|
|
}
|
|
|
|
/* starting here, usbcore will pay attention to this root hub */
|
|
rhdev->bus_mA = min(500u, hcd->power_budget);
|
|
if ((retval = register_root_hub(hcd)) != 0)
|
|
goto err_register_root_hub;
|
|
|
|
retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
|
|
if (retval < 0) {
|
|
printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
|
|
retval);
|
|
goto error_create_attr_group;
|
|
}
|
|
if (hcd->uses_new_polling && hcd->poll_rh)
|
|
usb_hcd_poll_rh_status(hcd);
|
|
return retval;
|
|
|
|
error_create_attr_group:
|
|
mutex_lock(&usb_bus_list_lock);
|
|
usb_disconnect(&hcd->self.root_hub);
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
err_register_root_hub:
|
|
hcd->driver->stop(hcd);
|
|
err_hcd_driver_start:
|
|
if (hcd->irq >= 0)
|
|
free_irq(irqnum, hcd);
|
|
err_request_irq:
|
|
err_hcd_driver_setup:
|
|
hcd->self.root_hub = NULL;
|
|
usb_put_dev(rhdev);
|
|
err_allocate_root_hub:
|
|
usb_deregister_bus(&hcd->self);
|
|
err_register_bus:
|
|
hcd_buffer_destroy(hcd);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_add_hcd);
|
|
|
|
/**
|
|
* usb_remove_hcd - shutdown processing for generic HCDs
|
|
* @hcd: the usb_hcd structure to remove
|
|
* Context: !in_interrupt()
|
|
*
|
|
* Disconnects the root hub, then reverses the effects of usb_add_hcd(),
|
|
* invoking the HCD's stop() method.
|
|
*/
|
|
void usb_remove_hcd(struct usb_hcd *hcd)
|
|
{
|
|
dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
|
|
|
|
if (HC_IS_RUNNING (hcd->state))
|
|
hcd->state = HC_STATE_QUIESCING;
|
|
|
|
dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
|
|
spin_lock_irq (&hcd_root_hub_lock);
|
|
hcd->rh_registered = 0;
|
|
spin_unlock_irq (&hcd_root_hub_lock);
|
|
|
|
#ifdef CONFIG_PM
|
|
cancel_work_sync(&hcd->wakeup_work);
|
|
#endif
|
|
|
|
sysfs_remove_group(&hcd->self.root_hub->dev.kobj, &usb_bus_attr_group);
|
|
mutex_lock(&usb_bus_list_lock);
|
|
usb_disconnect(&hcd->self.root_hub);
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
|
|
hcd->driver->stop(hcd);
|
|
hcd->state = HC_STATE_HALT;
|
|
|
|
hcd->poll_rh = 0;
|
|
del_timer_sync(&hcd->rh_timer);
|
|
|
|
if (hcd->irq >= 0)
|
|
free_irq(hcd->irq, hcd);
|
|
usb_deregister_bus(&hcd->self);
|
|
hcd_buffer_destroy(hcd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_remove_hcd);
|
|
|
|
void
|
|
usb_hcd_platform_shutdown(struct platform_device* dev)
|
|
{
|
|
struct usb_hcd *hcd = platform_get_drvdata(dev);
|
|
|
|
if (hcd->driver->shutdown)
|
|
hcd->driver->shutdown(hcd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
|
|
|
|
struct usb_mon_operations *mon_ops;
|
|
|
|
/*
|
|
* The registration is unlocked.
|
|
* We do it this way because we do not want to lock in hot paths.
|
|
*
|
|
* Notice that the code is minimally error-proof. Because usbmon needs
|
|
* symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
|
|
*/
|
|
|
|
int usb_mon_register (struct usb_mon_operations *ops)
|
|
{
|
|
|
|
if (mon_ops)
|
|
return -EBUSY;
|
|
|
|
mon_ops = ops;
|
|
mb();
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL (usb_mon_register);
|
|
|
|
void usb_mon_deregister (void)
|
|
{
|
|
|
|
if (mon_ops == NULL) {
|
|
printk(KERN_ERR "USB: monitor was not registered\n");
|
|
return;
|
|
}
|
|
mon_ops = NULL;
|
|
mb();
|
|
}
|
|
EXPORT_SYMBOL_GPL (usb_mon_deregister);
|
|
|
|
#endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
|