1b42ae6d43
This patch (as865) fixes a race in the HCD removal code discovered by Milan Plzik. Arrival of an interrupt after the root hub was unregistered could cause the root-hub status timer to start up, even after it was supposed to have been shut down. The problem is fixed by moving the del_timer_sync() call to after the HCD's stop() method, at which time IRQ generation should be disabled. Cc: Milan Plzik <milan.plzik@gmail.com> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1737 lines
49 KiB
C
1737 lines
49 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 <asm/scatterlist.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 <linux/platform_device.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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/* 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 hcd data */
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static DEFINE_SPINLOCK(hcd_data_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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/*-------------------------------------------------------------------------*/
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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 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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0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
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0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
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0x00, 0x00, /* __le16 idVendor; */
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0x00, 0x00, /* __le16 idProduct; */
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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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0x00, 0x00, /* __le16 idVendor; */
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0x00, 0x00, /* __le16 idProduct; */
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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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/*-------------------------------------------------------------------------*/
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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 int ascii2utf (char *s, u8 *utf, int utfmax)
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{
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int 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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* @type: string describing our driver
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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 int rh_string (
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int id,
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struct usb_hcd *hcd,
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u8 *data,
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int 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 (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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// unsupported IDs --> "protocol stall"
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} else
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return -EPIPE;
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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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/* 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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int len = 0;
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int patch_wakeup = 0;
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unsigned long flags;
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int status = 0;
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int n;
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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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/* DEVICE REQUESTS */
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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
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* through USB, userspace may change the default "allow wakeup"
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* policy through sysfs or these calls.
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*
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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
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* 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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*/
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case DeviceRequest | USB_REQ_GET_STATUS:
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tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
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<< USB_DEVICE_REMOTE_WAKEUP)
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| (1 << USB_DEVICE_SELF_POWERED);
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tbuf [1] = 0;
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len = 2;
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break;
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case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
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if (wValue == USB_DEVICE_REMOTE_WAKEUP)
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device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
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else
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goto error;
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break;
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case DeviceOutRequest | USB_REQ_SET_FEATURE:
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if (device_can_wakeup(&hcd->self.root_hub->dev)
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&& wValue == USB_DEVICE_REMOTE_WAKEUP)
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device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
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else
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goto error;
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break;
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case DeviceRequest | USB_REQ_GET_CONFIGURATION:
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tbuf [0] = 1;
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len = 1;
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/* FALLTHROUGH */
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case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
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break;
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case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
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switch (wValue & 0xff00) {
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case USB_DT_DEVICE << 8:
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if (hcd->driver->flags & HCD_USB2)
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bufp = usb2_rh_dev_descriptor;
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else if (hcd->driver->flags & HCD_USB11)
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bufp = usb11_rh_dev_descriptor;
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else
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goto error;
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len = 18;
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break;
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case USB_DT_CONFIG << 8:
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if (hcd->driver->flags & HCD_USB2) {
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bufp = hs_rh_config_descriptor;
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len = sizeof hs_rh_config_descriptor;
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} else {
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bufp = fs_rh_config_descriptor;
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len = sizeof fs_rh_config_descriptor;
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}
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if (device_can_wakeup(&hcd->self.root_hub->dev))
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patch_wakeup = 1;
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break;
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case USB_DT_STRING << 8:
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n = rh_string (wValue & 0xff, hcd, ubuf, wLength);
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if (n < 0)
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goto error;
|
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urb->actual_length = n;
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break;
|
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default:
|
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goto error;
|
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}
|
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break;
|
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case DeviceRequest | USB_REQ_GET_INTERFACE:
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tbuf [0] = 0;
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len = 1;
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/* FALLTHROUGH */
|
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case DeviceOutRequest | USB_REQ_SET_INTERFACE:
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break;
|
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case DeviceOutRequest | USB_REQ_SET_ADDRESS:
|
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// wValue == urb->dev->devaddr
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dev_dbg (hcd->self.controller, "root hub device address %d\n",
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wValue);
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break;
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|
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/* INTERFACE REQUESTS (no defined feature/status flags) */
|
|
|
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/* ENDPOINT REQUESTS */
|
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|
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case EndpointRequest | USB_REQ_GET_STATUS:
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// ENDPOINT_HALT flag
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tbuf [0] = 0;
|
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tbuf [1] = 0;
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len = 2;
|
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/* FALLTHROUGH */
|
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case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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case EndpointOutRequest | USB_REQ_SET_FEATURE:
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dev_dbg (hcd->self.controller, "no endpoint features yet\n");
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break;
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|
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/* CLASS REQUESTS (and errors) */
|
|
|
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default:
|
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/* non-generic request */
|
|
switch (typeReq) {
|
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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;
|
|
}
|
|
|
|
/* any errors get returned through the urb completion */
|
|
local_irq_save (flags);
|
|
spin_lock (&urb->lock);
|
|
if (urb->status == -EINPROGRESS)
|
|
urb->status = status;
|
|
spin_unlock (&urb->lock);
|
|
usb_hcd_giveback_urb (hcd, urb);
|
|
local_irq_restore (flags);
|
|
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 */
|
|
local_irq_save (flags);
|
|
spin_lock(&hcd_root_hub_lock);
|
|
urb = hcd->status_urb;
|
|
if (urb) {
|
|
spin_lock(&urb->lock);
|
|
if (urb->status == -EINPROGRESS) {
|
|
hcd->poll_pending = 0;
|
|
hcd->status_urb = NULL;
|
|
urb->status = 0;
|
|
urb->hcpriv = NULL;
|
|
urb->actual_length = length;
|
|
memcpy(urb->transfer_buffer, buffer, length);
|
|
} else /* urb has been unlinked */
|
|
length = 0;
|
|
spin_unlock(&urb->lock);
|
|
} else
|
|
length = 0;
|
|
spin_unlock(&hcd_root_hub_lock);
|
|
|
|
/* local irqs are always blocked in completions */
|
|
if (length > 0)
|
|
usb_hcd_giveback_urb (hcd, urb);
|
|
else
|
|
hcd->poll_pending = 1;
|
|
local_irq_restore (flags);
|
|
}
|
|
|
|
/* The USB 2.0 spec says 256 ms. This is close enough and won't
|
|
* exceed that limit if HZ is 100. */
|
|
if (hcd->uses_new_polling ? hcd->poll_rh :
|
|
(length == 0 && hcd->status_urb != NULL))
|
|
mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250));
|
|
}
|
|
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;
|
|
int len = 1 + (urb->dev->maxchild / 8);
|
|
|
|
spin_lock_irqsave (&hcd_root_hub_lock, flags);
|
|
if (urb->status != -EINPROGRESS) /* already unlinked */
|
|
retval = urb->status;
|
|
else if (hcd->status_urb || urb->transfer_buffer_length < len) {
|
|
dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
|
|
retval = -EINVAL;
|
|
} else {
|
|
hcd->status_urb = urb;
|
|
urb->hcpriv = hcd; /* indicate it's queued */
|
|
|
|
if (!hcd->uses_new_polling)
|
|
mod_timer (&hcd->rh_timer, jiffies +
|
|
msecs_to_jiffies(250));
|
|
|
|
/* If a status change has already occurred, report it ASAP */
|
|
else if (hcd->poll_pending)
|
|
mod_timer (&hcd->rh_timer, jiffies);
|
|
retval = 0;
|
|
}
|
|
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
if (usb_pipeint (urb->pipe))
|
|
return rh_queue_status (hcd, urb);
|
|
if (usb_pipecontrol (urb->pipe))
|
|
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)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
|
|
; /* Do nothing */
|
|
|
|
} else { /* Status URB */
|
|
if (!hcd->uses_new_polling)
|
|
del_timer (&hcd->rh_timer);
|
|
local_irq_save (flags);
|
|
spin_lock (&hcd_root_hub_lock);
|
|
if (urb == hcd->status_urb) {
|
|
hcd->status_urb = NULL;
|
|
urb->hcpriv = NULL;
|
|
} else
|
|
urb = NULL; /* wasn't fully queued */
|
|
spin_unlock (&hcd_root_hub_lock);
|
|
if (urb)
|
|
usb_hcd_giveback_urb (hcd, urb);
|
|
local_irq_restore (flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static struct class *usb_host_class;
|
|
|
|
int usb_host_init(void)
|
|
{
|
|
int retval = 0;
|
|
|
|
usb_host_class = class_create(THIS_MODULE, "usb_host");
|
|
if (IS_ERR(usb_host_class))
|
|
retval = PTR_ERR(usb_host_class);
|
|
return retval;
|
|
}
|
|
|
|
void usb_host_cleanup(void)
|
|
{
|
|
class_destroy(usb_host_class);
|
|
}
|
|
|
|
/**
|
|
* 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 busnum;
|
|
|
|
mutex_lock(&usb_bus_list_lock);
|
|
busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
|
|
if (busnum < USB_MAXBUS) {
|
|
set_bit (busnum, busmap.busmap);
|
|
bus->busnum = busnum;
|
|
} else {
|
|
printk (KERN_ERR "%s: too many buses\n", usbcore_name);
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
return -E2BIG;
|
|
}
|
|
|
|
bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
|
|
bus->controller, "usb_host%d", busnum);
|
|
if (IS_ERR(bus->class_dev)) {
|
|
clear_bit(busnum, busmap.busmap);
|
|
mutex_unlock(&usb_bus_list_lock);
|
|
return PTR_ERR(bus->class_dev);
|
|
}
|
|
|
|
class_set_devdata(bus->class_dev, bus);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
class_device_unregister(bus->class_dev);
|
|
}
|
|
|
|
/**
|
|
* 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 = __constant_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",
|
|
usb_dev->dev.bus_id, 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",
|
|
usb_dev->dev.bus_id, 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;
|
|
}
|
|
|
|
void usb_enable_root_hub_irq (struct usb_bus *bus)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
|
|
hcd = container_of (bus, struct usb_hcd, self);
|
|
if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT)
|
|
hcd->driver->hub_irq_enable (hcd);
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* 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 (usb_calc_bus_time);
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Generic HC operations.
|
|
*/
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void urb_unlink (struct urb *urb)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* clear all state linking urb to this dev (and hcd) */
|
|
|
|
spin_lock_irqsave (&hcd_data_lock, flags);
|
|
list_del_init (&urb->urb_list);
|
|
spin_unlock_irqrestore (&hcd_data_lock, flags);
|
|
}
|
|
|
|
|
|
/* 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);
|
|
struct usb_host_endpoint *ep;
|
|
unsigned long flags;
|
|
|
|
if (!hcd)
|
|
return -ENODEV;
|
|
|
|
usbmon_urb_submit(&hcd->self, urb);
|
|
|
|
/*
|
|
* Atomically queue the urb, first to our records, then to the HCD.
|
|
* Access to urb->status is controlled by urb->lock ... changes on
|
|
* i/o completion (normal or fault) or unlinking.
|
|
*/
|
|
|
|
// FIXME: verify that quiescing hc works right (RH cleans up)
|
|
|
|
spin_lock_irqsave (&hcd_data_lock, flags);
|
|
ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
|
|
[usb_pipeendpoint(urb->pipe)];
|
|
if (unlikely (!ep))
|
|
status = -ENOENT;
|
|
else if (unlikely (urb->reject))
|
|
status = -EPERM;
|
|
else switch (hcd->state) {
|
|
case HC_STATE_RUNNING:
|
|
case HC_STATE_RESUMING:
|
|
doit:
|
|
list_add_tail (&urb->urb_list, &ep->urb_list);
|
|
status = 0;
|
|
break;
|
|
case HC_STATE_SUSPENDED:
|
|
/* HC upstream links (register access, wakeup signaling) can work
|
|
* even when the downstream links (and DMA etc) are quiesced; let
|
|
* usbcore talk to the root hub.
|
|
*/
|
|
if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
|
|
&& urb->dev->parent == NULL)
|
|
goto doit;
|
|
/* FALL THROUGH */
|
|
default:
|
|
status = -ESHUTDOWN;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore (&hcd_data_lock, flags);
|
|
if (status) {
|
|
INIT_LIST_HEAD (&urb->urb_list);
|
|
usbmon_urb_submit_error(&hcd->self, urb, status);
|
|
return status;
|
|
}
|
|
|
|
/* increment urb's reference count as part of giving it to the HCD
|
|
* (which now controls it). HCD guarantees that it either returns
|
|
* an error or calls giveback(), but not both.
|
|
*/
|
|
urb = usb_get_urb (urb);
|
|
atomic_inc (&urb->use_count);
|
|
|
|
if (urb->dev == hcd->self.root_hub) {
|
|
/* NOTE: requirement on hub callers (usbfs and the hub
|
|
* driver, for now) that URBs' urb->transfer_buffer be
|
|
* valid and usb_buffer_{sync,unmap}() not be needed, since
|
|
* they could clobber root hub response data.
|
|
*/
|
|
status = rh_urb_enqueue (hcd, urb);
|
|
goto done;
|
|
}
|
|
|
|
/* lower level hcd code should use *_dma exclusively,
|
|
* unless it uses pio or talks to another transport.
|
|
*/
|
|
if (hcd->self.uses_dma) {
|
|
if (usb_pipecontrol (urb->pipe)
|
|
&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
|
|
urb->setup_dma = dma_map_single (
|
|
hcd->self.controller,
|
|
urb->setup_packet,
|
|
sizeof (struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
if (urb->transfer_buffer_length != 0
|
|
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
|
|
urb->transfer_dma = dma_map_single (
|
|
hcd->self.controller,
|
|
urb->transfer_buffer,
|
|
urb->transfer_buffer_length,
|
|
usb_pipein (urb->pipe)
|
|
? DMA_FROM_DEVICE
|
|
: DMA_TO_DEVICE);
|
|
}
|
|
|
|
status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
|
|
done:
|
|
if (unlikely (status)) {
|
|
urb_unlink (urb);
|
|
atomic_dec (&urb->use_count);
|
|
if (urb->reject)
|
|
wake_up (&usb_kill_urb_queue);
|
|
usb_put_urb (urb);
|
|
usbmon_urb_submit_error(&hcd->self, urb, status);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* 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 value;
|
|
|
|
if (urb->dev == hcd->self.root_hub)
|
|
value = usb_rh_urb_dequeue (hcd, urb);
|
|
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);
|
|
}
|
|
|
|
if (value != 0)
|
|
dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
|
|
urb, value);
|
|
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_host_endpoint *ep;
|
|
struct usb_hcd *hcd = NULL;
|
|
struct device *sys = NULL;
|
|
unsigned long flags;
|
|
struct list_head *tmp;
|
|
int retval;
|
|
|
|
if (!urb)
|
|
return -EINVAL;
|
|
if (!urb->dev || !urb->dev->bus)
|
|
return -ENODEV;
|
|
ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
|
|
[usb_pipeendpoint(urb->pipe)];
|
|
if (!ep)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* we contend for urb->status with the hcd core,
|
|
* which changes it while returning the urb.
|
|
*
|
|
* Caller guaranteed that the urb pointer hasn't been freed, and
|
|
* that it was submitted. But as a rule it can't know whether or
|
|
* not it's already been unlinked ... so we respect the reversed
|
|
* lock sequence needed for the usb_hcd_giveback_urb() code paths
|
|
* (urb lock, then hcd_data_lock) in case some other CPU is now
|
|
* unlinking it.
|
|
*/
|
|
spin_lock_irqsave (&urb->lock, flags);
|
|
spin_lock (&hcd_data_lock);
|
|
|
|
sys = &urb->dev->dev;
|
|
hcd = bus_to_hcd(urb->dev->bus);
|
|
if (hcd == NULL) {
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
/* insist the urb is still queued */
|
|
list_for_each(tmp, &ep->urb_list) {
|
|
if (tmp == &urb->urb_list)
|
|
break;
|
|
}
|
|
if (tmp != &urb->urb_list) {
|
|
retval = -EIDRM;
|
|
goto done;
|
|
}
|
|
|
|
/* 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->status != -EINPROGRESS) {
|
|
retval = -EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
/* 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)
|
|
&& hcd->self.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);
|
|
}
|
|
|
|
urb->status = status;
|
|
|
|
spin_unlock (&hcd_data_lock);
|
|
spin_unlock_irqrestore (&urb->lock, flags);
|
|
|
|
retval = unlink1 (hcd, urb);
|
|
if (retval == 0)
|
|
retval = -EINPROGRESS;
|
|
return retval;
|
|
|
|
done:
|
|
spin_unlock (&hcd_data_lock);
|
|
spin_unlock_irqrestore (&urb->lock, flags);
|
|
if (retval != -EIDRM && sys && sys->driver)
|
|
dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
|
|
return retval;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* disables the endpoint: cancels any pending urbs, then synchronizes with
|
|
* the hcd to make sure all endpoint state is gone from hardware, and then
|
|
* waits until the endpoint's queue is completely drained. 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_endpoint_disable (struct usb_device *udev,
|
|
struct usb_host_endpoint *ep)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
struct urb *urb;
|
|
|
|
hcd = bus_to_hcd(udev->bus);
|
|
|
|
WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
|
|
udev->state != USB_STATE_NOTATTACHED);
|
|
|
|
local_irq_disable ();
|
|
|
|
/* ep is already gone from udev->ep_{in,out}[]; no more submits */
|
|
rescan:
|
|
spin_lock (&hcd_data_lock);
|
|
list_for_each_entry (urb, &ep->urb_list, urb_list) {
|
|
int tmp;
|
|
|
|
/* the urb may already have been unlinked */
|
|
if (urb->status != -EINPROGRESS)
|
|
continue;
|
|
usb_get_urb (urb);
|
|
spin_unlock (&hcd_data_lock);
|
|
|
|
spin_lock (&urb->lock);
|
|
tmp = urb->status;
|
|
if (tmp == -EINPROGRESS)
|
|
urb->status = -ESHUTDOWN;
|
|
spin_unlock (&urb->lock);
|
|
|
|
/* kick hcd unless it's already returning this */
|
|
if (tmp == -EINPROGRESS) {
|
|
tmp = urb->pipe;
|
|
unlink1 (hcd, urb);
|
|
dev_dbg (hcd->self.controller,
|
|
"shutdown urb %p pipe %08x ep%d%s%s\n",
|
|
urb, tmp, usb_pipeendpoint (tmp),
|
|
(tmp & USB_DIR_IN) ? "in" : "out",
|
|
({ char *s; \
|
|
switch (usb_pipetype (tmp)) { \
|
|
case PIPE_CONTROL: s = ""; break; \
|
|
case PIPE_BULK: s = "-bulk"; break; \
|
|
case PIPE_INTERRUPT: s = "-intr"; break; \
|
|
default: s = "-iso"; break; \
|
|
}; s;}));
|
|
}
|
|
usb_put_urb (urb);
|
|
|
|
/* list contents may have changed */
|
|
goto rescan;
|
|
}
|
|
spin_unlock (&hcd_data_lock);
|
|
local_irq_enable ();
|
|
|
|
/* synchronize with the hardware, so old configuration state
|
|
* clears out immediately (and will be freed).
|
|
*/
|
|
might_sleep ();
|
|
if (hcd->driver->endpoint_disable)
|
|
hcd->driver->endpoint_disable (hcd, ep);
|
|
|
|
/* Wait until the endpoint queue is completely empty. Most HCDs
|
|
* will have done this already in their endpoint_disable method,
|
|
* but some might not. And there could be root-hub control URBs
|
|
* still pending since they aren't affected by the HCDs'
|
|
* endpoint_disable methods.
|
|
*/
|
|
while (!list_empty (&ep->urb_list)) {
|
|
spin_lock_irq (&hcd_data_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_data_lock);
|
|
|
|
if (urb) {
|
|
usb_kill_urb (urb);
|
|
usb_put_urb (urb);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
int hcd_bus_suspend (struct usb_bus *bus)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
int status;
|
|
|
|
hcd = container_of (bus, struct usb_hcd, self);
|
|
if (!hcd->driver->bus_suspend)
|
|
return -ENOENT;
|
|
hcd->state = HC_STATE_QUIESCING;
|
|
status = hcd->driver->bus_suspend (hcd);
|
|
if (status == 0)
|
|
hcd->state = HC_STATE_SUSPENDED;
|
|
else
|
|
dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
|
|
"suspend", status);
|
|
return status;
|
|
}
|
|
|
|
int hcd_bus_resume (struct usb_bus *bus)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
int status;
|
|
|
|
hcd = container_of (bus, struct usb_hcd, self);
|
|
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)
|
|
hcd->state = HC_STATE_RUNNING;
|
|
else {
|
|
dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
|
|
"resume", status);
|
|
usb_hc_died(hcd);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* 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. It queues a request for khubd 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)
|
|
usb_resume_root_hub (hcd->self.root_hub);
|
|
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 (usb_bus_start_enum);
|
|
|
|
#endif
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* 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.
|
|
* 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.
|
|
*/
|
|
void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb)
|
|
{
|
|
int at_root_hub;
|
|
|
|
at_root_hub = (urb->dev == hcd->self.root_hub);
|
|
urb_unlink (urb);
|
|
|
|
/* lower level hcd code should use *_dma exclusively if the
|
|
* host controller does DMA */
|
|
if (hcd->self.uses_dma && !at_root_hub) {
|
|
if (usb_pipecontrol (urb->pipe)
|
|
&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
|
|
dma_unmap_single (hcd->self.controller, urb->setup_dma,
|
|
sizeof (struct usb_ctrlrequest),
|
|
DMA_TO_DEVICE);
|
|
if (urb->transfer_buffer_length != 0
|
|
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
|
|
dma_unmap_single (hcd->self.controller,
|
|
urb->transfer_dma,
|
|
urb->transfer_buffer_length,
|
|
usb_pipein (urb->pipe)
|
|
? DMA_FROM_DEVICE
|
|
: DMA_TO_DEVICE);
|
|
}
|
|
|
|
usbmon_urb_complete (&hcd->self, urb);
|
|
/* pass ownership to the completion handler */
|
|
urb->complete (urb);
|
|
atomic_dec (&urb->use_count);
|
|
if (unlikely (urb->reject))
|
|
wake_up (&usb_kill_urb_queue);
|
|
usb_put_urb (urb);
|
|
}
|
|
EXPORT_SYMBOL (usb_hcd_giveback_urb);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* 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
|
|
* @r: saved hardware registers
|
|
*
|
|
* 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;
|
|
int start = hcd->state;
|
|
|
|
if (unlikely(start == HC_STATE_HALT ||
|
|
!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
|
|
return IRQ_NONE;
|
|
if (hcd->driver->irq (hcd) == IRQ_NONE)
|
|
return IRQ_NONE;
|
|
|
|
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
|
|
|
|
if (unlikely(hcd->state == HC_STATE_HALT))
|
|
usb_hc_died (hcd);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* 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, 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;
|
|
|
|
hcd->driver = driver;
|
|
hcd->product_desc = (driver->product_desc) ? driver->product_desc :
|
|
"USB Host Controller";
|
|
|
|
return hcd;
|
|
}
|
|
EXPORT_SYMBOL (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 (usb_get_hcd);
|
|
|
|
void usb_put_hcd (struct usb_hcd *hcd)
|
|
{
|
|
if (hcd)
|
|
kref_put (&hcd->kref, hcd_release);
|
|
}
|
|
EXPORT_SYMBOL (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);
|
|
|
|
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;
|
|
}
|
|
rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
|
|
USB_SPEED_FULL;
|
|
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) {
|
|
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;
|
|
|
|
if (hcd->uses_new_polling && hcd->poll_rh)
|
|
usb_hcd_poll_rh_status(hcd);
|
|
return retval;
|
|
|
|
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 (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);
|
|
|
|
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 (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 (usb_hcd_platform_shutdown);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#if defined(CONFIG_USB_MON)
|
|
|
|
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 */
|