![Alan Stern](/assets/img/avatar_default.png)
Currently the USB stack assumes that all host controller drivers are capable of receiving wakeup requests from downstream devices. However, this isn't true for the isp1760-hcd driver, which means that it isn't safe to do a runtime suspend of any device attached to a root-hub port if the device requires wakeup. This patch adds a "cant_recv_wakeups" flag to the usb_hcd structure and sets the flag in isp1760-hcd. The core is modified to prevent a direct child of the root hub from being put into runtime suspend with wakeup enabled if the flag is set. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Nicolas Pitre <nico@linaro.org> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
1877 lines
54 KiB
C
1877 lines
54 KiB
C
/*
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* drivers/usb/driver.c - most of the driver model stuff for usb
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*
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* (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* based on drivers/usb/usb.c which had the following copyrights:
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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 (new USB architecture)
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* (C) Copyright Randy Dunlap 2000
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* (C) Copyright David Brownell 2000-2004
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* (C) Copyright Yggdrasil Computing, Inc. 2000
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* (usb_device_id matching changes by Adam J. Richter)
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* (C) Copyright Greg Kroah-Hartman 2002-2003
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*
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* NOTE! This is not actually a driver at all, rather this is
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* just a collection of helper routines that implement the
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* matching, probing, releasing, suspending and resuming for
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* real drivers.
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*
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*/
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/usb.h>
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#include <linux/usb/quirks.h>
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#include <linux/usb/hcd.h>
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#include "usb.h"
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/*
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* Adds a new dynamic USBdevice ID to this driver,
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* and cause the driver to probe for all devices again.
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*/
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ssize_t usb_store_new_id(struct usb_dynids *dynids,
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const struct usb_device_id *id_table,
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struct device_driver *driver,
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const char *buf, size_t count)
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{
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struct usb_dynid *dynid;
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u32 idVendor = 0;
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u32 idProduct = 0;
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unsigned int bInterfaceClass = 0;
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u32 refVendor, refProduct;
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int fields = 0;
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int retval = 0;
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fields = sscanf(buf, "%x %x %x %x %x", &idVendor, &idProduct,
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&bInterfaceClass, &refVendor, &refProduct);
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if (fields < 2)
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return -EINVAL;
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dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
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if (!dynid)
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return -ENOMEM;
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INIT_LIST_HEAD(&dynid->node);
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dynid->id.idVendor = idVendor;
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dynid->id.idProduct = idProduct;
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dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
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if (fields > 2 && bInterfaceClass) {
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if (bInterfaceClass > 255) {
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retval = -EINVAL;
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goto fail;
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}
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dynid->id.bInterfaceClass = (u8)bInterfaceClass;
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dynid->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
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}
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if (fields > 4) {
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const struct usb_device_id *id = id_table;
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if (!id) {
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retval = -ENODEV;
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goto fail;
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}
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for (; id->match_flags; id++)
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if (id->idVendor == refVendor && id->idProduct == refProduct)
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break;
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if (id->match_flags) {
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dynid->id.driver_info = id->driver_info;
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} else {
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retval = -ENODEV;
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goto fail;
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}
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}
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spin_lock(&dynids->lock);
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list_add_tail(&dynid->node, &dynids->list);
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spin_unlock(&dynids->lock);
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retval = driver_attach(driver);
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if (retval)
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return retval;
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return count;
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fail:
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kfree(dynid);
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return retval;
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}
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EXPORT_SYMBOL_GPL(usb_store_new_id);
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ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf)
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{
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struct usb_dynid *dynid;
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size_t count = 0;
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list_for_each_entry(dynid, &dynids->list, node)
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if (dynid->id.bInterfaceClass != 0)
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%04x %04x %02x\n",
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dynid->id.idVendor, dynid->id.idProduct,
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dynid->id.bInterfaceClass);
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else
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%04x %04x\n",
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dynid->id.idVendor, dynid->id.idProduct);
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return count;
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}
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EXPORT_SYMBOL_GPL(usb_show_dynids);
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static ssize_t new_id_show(struct device_driver *driver, char *buf)
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{
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struct usb_driver *usb_drv = to_usb_driver(driver);
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return usb_show_dynids(&usb_drv->dynids, buf);
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}
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static ssize_t new_id_store(struct device_driver *driver,
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const char *buf, size_t count)
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{
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struct usb_driver *usb_drv = to_usb_driver(driver);
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return usb_store_new_id(&usb_drv->dynids, usb_drv->id_table, driver, buf, count);
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}
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static DRIVER_ATTR_RW(new_id);
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/*
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* Remove a USB device ID from this driver
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*/
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static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
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size_t count)
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{
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struct usb_dynid *dynid, *n;
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struct usb_driver *usb_driver = to_usb_driver(driver);
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u32 idVendor;
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u32 idProduct;
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int fields;
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fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
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if (fields < 2)
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return -EINVAL;
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spin_lock(&usb_driver->dynids.lock);
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list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) {
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struct usb_device_id *id = &dynid->id;
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if ((id->idVendor == idVendor) &&
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(id->idProduct == idProduct)) {
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list_del(&dynid->node);
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kfree(dynid);
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break;
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}
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}
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spin_unlock(&usb_driver->dynids.lock);
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return count;
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}
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static ssize_t remove_id_show(struct device_driver *driver, char *buf)
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{
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return new_id_show(driver, buf);
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}
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static DRIVER_ATTR_RW(remove_id);
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static int usb_create_newid_files(struct usb_driver *usb_drv)
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{
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int error = 0;
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if (usb_drv->no_dynamic_id)
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goto exit;
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if (usb_drv->probe != NULL) {
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error = driver_create_file(&usb_drv->drvwrap.driver,
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&driver_attr_new_id);
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if (error == 0) {
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error = driver_create_file(&usb_drv->drvwrap.driver,
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&driver_attr_remove_id);
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if (error)
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driver_remove_file(&usb_drv->drvwrap.driver,
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&driver_attr_new_id);
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}
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}
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exit:
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return error;
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}
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static void usb_remove_newid_files(struct usb_driver *usb_drv)
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{
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if (usb_drv->no_dynamic_id)
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return;
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if (usb_drv->probe != NULL) {
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driver_remove_file(&usb_drv->drvwrap.driver,
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&driver_attr_remove_id);
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driver_remove_file(&usb_drv->drvwrap.driver,
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&driver_attr_new_id);
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}
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}
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static void usb_free_dynids(struct usb_driver *usb_drv)
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{
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struct usb_dynid *dynid, *n;
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spin_lock(&usb_drv->dynids.lock);
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list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
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list_del(&dynid->node);
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kfree(dynid);
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}
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spin_unlock(&usb_drv->dynids.lock);
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}
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static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
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struct usb_driver *drv)
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{
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struct usb_dynid *dynid;
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spin_lock(&drv->dynids.lock);
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list_for_each_entry(dynid, &drv->dynids.list, node) {
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if (usb_match_one_id(intf, &dynid->id)) {
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spin_unlock(&drv->dynids.lock);
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return &dynid->id;
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}
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}
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spin_unlock(&drv->dynids.lock);
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return NULL;
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}
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/* called from driver core with dev locked */
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static int usb_probe_device(struct device *dev)
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{
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struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
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struct usb_device *udev = to_usb_device(dev);
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int error = 0;
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dev_dbg(dev, "%s\n", __func__);
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/* TODO: Add real matching code */
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/* The device should always appear to be in use
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* unless the driver supports autosuspend.
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*/
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if (!udriver->supports_autosuspend)
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error = usb_autoresume_device(udev);
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if (!error)
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error = udriver->probe(udev);
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return error;
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}
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/* called from driver core with dev locked */
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static int usb_unbind_device(struct device *dev)
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{
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struct usb_device *udev = to_usb_device(dev);
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struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
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udriver->disconnect(udev);
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if (!udriver->supports_autosuspend)
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usb_autosuspend_device(udev);
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return 0;
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}
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/* called from driver core with dev locked */
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static int usb_probe_interface(struct device *dev)
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{
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struct usb_driver *driver = to_usb_driver(dev->driver);
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *udev = interface_to_usbdev(intf);
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const struct usb_device_id *id;
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int error = -ENODEV;
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int lpm_disable_error;
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dev_dbg(dev, "%s\n", __func__);
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intf->needs_binding = 0;
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if (usb_device_is_owned(udev))
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return error;
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if (udev->authorized == 0) {
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dev_err(&intf->dev, "Device is not authorized for usage\n");
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return error;
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}
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id = usb_match_dynamic_id(intf, driver);
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if (!id)
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id = usb_match_id(intf, driver->id_table);
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if (!id)
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return error;
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dev_dbg(dev, "%s - got id\n", __func__);
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error = usb_autoresume_device(udev);
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if (error)
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return error;
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intf->condition = USB_INTERFACE_BINDING;
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/* Probed interfaces are initially active. They are
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* runtime-PM-enabled only if the driver has autosuspend support.
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* They are sensitive to their children's power states.
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*/
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pm_runtime_set_active(dev);
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pm_suspend_ignore_children(dev, false);
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if (driver->supports_autosuspend)
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pm_runtime_enable(dev);
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/* If the new driver doesn't allow hub-initiated LPM, and we can't
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* disable hub-initiated LPM, then fail the probe.
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*
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* Otherwise, leaving LPM enabled should be harmless, because the
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* endpoint intervals should remain the same, and the U1/U2 timeouts
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* should remain the same.
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*
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* If we need to install alt setting 0 before probe, or another alt
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* setting during probe, that should also be fine. usb_set_interface()
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* will attempt to disable LPM, and fail if it can't disable it.
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*/
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lpm_disable_error = usb_unlocked_disable_lpm(udev);
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if (lpm_disable_error && driver->disable_hub_initiated_lpm) {
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dev_err(&intf->dev, "%s Failed to disable LPM for driver %s\n.",
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__func__, driver->name);
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error = lpm_disable_error;
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goto err;
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}
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/* Carry out a deferred switch to altsetting 0 */
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if (intf->needs_altsetting0) {
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error = usb_set_interface(udev, intf->altsetting[0].
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desc.bInterfaceNumber, 0);
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if (error < 0)
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goto err;
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intf->needs_altsetting0 = 0;
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}
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error = driver->probe(intf, id);
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if (error)
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goto err;
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intf->condition = USB_INTERFACE_BOUND;
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/* If the LPM disable succeeded, balance the ref counts. */
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if (!lpm_disable_error)
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usb_unlocked_enable_lpm(udev);
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usb_autosuspend_device(udev);
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return error;
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err:
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usb_set_intfdata(intf, NULL);
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intf->needs_remote_wakeup = 0;
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intf->condition = USB_INTERFACE_UNBOUND;
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/* If the LPM disable succeeded, balance the ref counts. */
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if (!lpm_disable_error)
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usb_unlocked_enable_lpm(udev);
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/* Unbound interfaces are always runtime-PM-disabled and -suspended */
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if (driver->supports_autosuspend)
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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usb_autosuspend_device(udev);
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return error;
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}
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/* called from driver core with dev locked */
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static int usb_unbind_interface(struct device *dev)
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{
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struct usb_driver *driver = to_usb_driver(dev->driver);
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_host_endpoint *ep, **eps = NULL;
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struct usb_device *udev;
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int i, j, error, r, lpm_disable_error;
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intf->condition = USB_INTERFACE_UNBINDING;
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/* Autoresume for set_interface call below */
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udev = interface_to_usbdev(intf);
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error = usb_autoresume_device(udev);
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/* Hub-initiated LPM policy may change, so attempt to disable LPM until
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* the driver is unbound. If LPM isn't disabled, that's fine because it
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* wouldn't be enabled unless all the bound interfaces supported
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* hub-initiated LPM.
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*/
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lpm_disable_error = usb_unlocked_disable_lpm(udev);
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/*
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* Terminate all URBs for this interface unless the driver
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* supports "soft" unbinding and the device is still present.
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*/
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if (!driver->soft_unbind || udev->state == USB_STATE_NOTATTACHED)
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usb_disable_interface(udev, intf, false);
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driver->disconnect(intf);
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/* Free streams */
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for (i = 0, j = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
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ep = &intf->cur_altsetting->endpoint[i];
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if (ep->streams == 0)
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continue;
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if (j == 0) {
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eps = kmalloc(USB_MAXENDPOINTS * sizeof(void *),
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GFP_KERNEL);
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if (!eps) {
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dev_warn(dev, "oom, leaking streams\n");
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break;
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}
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}
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eps[j++] = ep;
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}
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if (j) {
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usb_free_streams(intf, eps, j, GFP_KERNEL);
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kfree(eps);
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}
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|
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/* Reset other interface state.
|
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* We cannot do a Set-Interface if the device is suspended or
|
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* if it is prepared for a system sleep (since installing a new
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* altsetting means creating new endpoint device entries).
|
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* When either of these happens, defer the Set-Interface.
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*/
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if (intf->cur_altsetting->desc.bAlternateSetting == 0) {
|
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/* Already in altsetting 0 so skip Set-Interface.
|
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* Just re-enable it without affecting the endpoint toggles.
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*/
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usb_enable_interface(udev, intf, false);
|
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} else if (!error && !intf->dev.power.is_prepared) {
|
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r = usb_set_interface(udev, intf->altsetting[0].
|
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desc.bInterfaceNumber, 0);
|
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if (r < 0)
|
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intf->needs_altsetting0 = 1;
|
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} else {
|
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intf->needs_altsetting0 = 1;
|
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}
|
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usb_set_intfdata(intf, NULL);
|
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|
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intf->condition = USB_INTERFACE_UNBOUND;
|
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intf->needs_remote_wakeup = 0;
|
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|
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/* Attempt to re-enable USB3 LPM, if the disable succeeded. */
|
|
if (!lpm_disable_error)
|
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usb_unlocked_enable_lpm(udev);
|
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|
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/* Unbound interfaces are always runtime-PM-disabled and -suspended */
|
|
if (driver->supports_autosuspend)
|
|
pm_runtime_disable(dev);
|
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pm_runtime_set_suspended(dev);
|
|
|
|
/* Undo any residual pm_autopm_get_interface_* calls */
|
|
for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r)
|
|
usb_autopm_put_interface_no_suspend(intf);
|
|
atomic_set(&intf->pm_usage_cnt, 0);
|
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|
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if (!error)
|
|
usb_autosuspend_device(udev);
|
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|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb_driver_claim_interface - bind a driver to an interface
|
|
* @driver: the driver to be bound
|
|
* @iface: the interface to which it will be bound; must be in the
|
|
* usb device's active configuration
|
|
* @priv: driver data associated with that interface
|
|
*
|
|
* This is used by usb device drivers that need to claim more than one
|
|
* interface on a device when probing (audio and acm are current examples).
|
|
* No device driver should directly modify internal usb_interface or
|
|
* usb_device structure members.
|
|
*
|
|
* Few drivers should need to use this routine, since the most natural
|
|
* way to bind to an interface is to return the private data from
|
|
* the driver's probe() method.
|
|
*
|
|
* Callers must own the device lock, so driver probe() entries don't need
|
|
* extra locking, but other call contexts may need to explicitly claim that
|
|
* lock.
|
|
*
|
|
* Return: 0 on success.
|
|
*/
|
|
int usb_driver_claim_interface(struct usb_driver *driver,
|
|
struct usb_interface *iface, void *priv)
|
|
{
|
|
struct device *dev = &iface->dev;
|
|
struct usb_device *udev;
|
|
int retval = 0;
|
|
int lpm_disable_error;
|
|
|
|
if (dev->driver)
|
|
return -EBUSY;
|
|
|
|
udev = interface_to_usbdev(iface);
|
|
|
|
dev->driver = &driver->drvwrap.driver;
|
|
usb_set_intfdata(iface, priv);
|
|
iface->needs_binding = 0;
|
|
|
|
iface->condition = USB_INTERFACE_BOUND;
|
|
|
|
/* Disable LPM until this driver is bound. */
|
|
lpm_disable_error = usb_unlocked_disable_lpm(udev);
|
|
if (lpm_disable_error && driver->disable_hub_initiated_lpm) {
|
|
dev_err(&iface->dev, "%s Failed to disable LPM for driver %s\n.",
|
|
__func__, driver->name);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Claimed interfaces are initially inactive (suspended) and
|
|
* runtime-PM-enabled, but only if the driver has autosuspend
|
|
* support. Otherwise they are marked active, to prevent the
|
|
* device from being autosuspended, but left disabled. In either
|
|
* case they are sensitive to their children's power states.
|
|
*/
|
|
pm_suspend_ignore_children(dev, false);
|
|
if (driver->supports_autosuspend)
|
|
pm_runtime_enable(dev);
|
|
else
|
|
pm_runtime_set_active(dev);
|
|
|
|
/* if interface was already added, bind now; else let
|
|
* the future device_add() bind it, bypassing probe()
|
|
*/
|
|
if (device_is_registered(dev))
|
|
retval = device_bind_driver(dev);
|
|
|
|
/* Attempt to re-enable USB3 LPM, if the disable was successful. */
|
|
if (!lpm_disable_error)
|
|
usb_unlocked_enable_lpm(udev);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_driver_claim_interface);
|
|
|
|
/**
|
|
* usb_driver_release_interface - unbind a driver from an interface
|
|
* @driver: the driver to be unbound
|
|
* @iface: the interface from which it will be unbound
|
|
*
|
|
* This can be used by drivers to release an interface without waiting
|
|
* for their disconnect() methods to be called. In typical cases this
|
|
* also causes the driver disconnect() method to be called.
|
|
*
|
|
* This call is synchronous, and may not be used in an interrupt context.
|
|
* Callers must own the device lock, so driver disconnect() entries don't
|
|
* need extra locking, but other call contexts may need to explicitly claim
|
|
* that lock.
|
|
*/
|
|
void usb_driver_release_interface(struct usb_driver *driver,
|
|
struct usb_interface *iface)
|
|
{
|
|
struct device *dev = &iface->dev;
|
|
|
|
/* this should never happen, don't release something that's not ours */
|
|
if (!dev->driver || dev->driver != &driver->drvwrap.driver)
|
|
return;
|
|
|
|
/* don't release from within disconnect() */
|
|
if (iface->condition != USB_INTERFACE_BOUND)
|
|
return;
|
|
iface->condition = USB_INTERFACE_UNBINDING;
|
|
|
|
/* Release via the driver core only if the interface
|
|
* has already been registered
|
|
*/
|
|
if (device_is_registered(dev)) {
|
|
device_release_driver(dev);
|
|
} else {
|
|
device_lock(dev);
|
|
usb_unbind_interface(dev);
|
|
dev->driver = NULL;
|
|
device_unlock(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_driver_release_interface);
|
|
|
|
/* returns 0 if no match, 1 if match */
|
|
int usb_match_device(struct usb_device *dev, const struct usb_device_id *id)
|
|
{
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
|
|
id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
|
|
id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
|
|
return 0;
|
|
|
|
/* No need to test id->bcdDevice_lo != 0, since 0 is never
|
|
greater than any unsigned number. */
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
|
|
(id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
|
|
(id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
|
|
(id->bDeviceClass != dev->descriptor.bDeviceClass))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
|
|
(id->bDeviceSubClass != dev->descriptor.bDeviceSubClass))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
|
|
(id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* returns 0 if no match, 1 if match */
|
|
int usb_match_one_id_intf(struct usb_device *dev,
|
|
struct usb_host_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
/* The interface class, subclass, protocol and number should never be
|
|
* checked for a match if the device class is Vendor Specific,
|
|
* unless the match record specifies the Vendor ID. */
|
|
if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC &&
|
|
!(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
|
|
(id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
|
|
USB_DEVICE_ID_MATCH_INT_SUBCLASS |
|
|
USB_DEVICE_ID_MATCH_INT_PROTOCOL |
|
|
USB_DEVICE_ID_MATCH_INT_NUMBER)))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
|
|
(id->bInterfaceClass != intf->desc.bInterfaceClass))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
|
|
(id->bInterfaceSubClass != intf->desc.bInterfaceSubClass))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
|
|
(id->bInterfaceProtocol != intf->desc.bInterfaceProtocol))
|
|
return 0;
|
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
|
|
(id->bInterfaceNumber != intf->desc.bInterfaceNumber))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* returns 0 if no match, 1 if match */
|
|
int usb_match_one_id(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_host_interface *intf;
|
|
struct usb_device *dev;
|
|
|
|
/* proc_connectinfo in devio.c may call us with id == NULL. */
|
|
if (id == NULL)
|
|
return 0;
|
|
|
|
intf = interface->cur_altsetting;
|
|
dev = interface_to_usbdev(interface);
|
|
|
|
if (!usb_match_device(dev, id))
|
|
return 0;
|
|
|
|
return usb_match_one_id_intf(dev, intf, id);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_match_one_id);
|
|
|
|
/**
|
|
* usb_match_id - find first usb_device_id matching device or interface
|
|
* @interface: the interface of interest
|
|
* @id: array of usb_device_id structures, terminated by zero entry
|
|
*
|
|
* usb_match_id searches an array of usb_device_id's and returns
|
|
* the first one matching the device or interface, or null.
|
|
* This is used when binding (or rebinding) a driver to an interface.
|
|
* Most USB device drivers will use this indirectly, through the usb core,
|
|
* but some layered driver frameworks use it directly.
|
|
* These device tables are exported with MODULE_DEVICE_TABLE, through
|
|
* modutils, to support the driver loading functionality of USB hotplugging.
|
|
*
|
|
* Return: The first matching usb_device_id, or %NULL.
|
|
*
|
|
* What Matches:
|
|
*
|
|
* The "match_flags" element in a usb_device_id controls which
|
|
* members are used. If the corresponding bit is set, the
|
|
* value in the device_id must match its corresponding member
|
|
* in the device or interface descriptor, or else the device_id
|
|
* does not match.
|
|
*
|
|
* "driver_info" is normally used only by device drivers,
|
|
* but you can create a wildcard "matches anything" usb_device_id
|
|
* as a driver's "modules.usbmap" entry if you provide an id with
|
|
* only a nonzero "driver_info" field. If you do this, the USB device
|
|
* driver's probe() routine should use additional intelligence to
|
|
* decide whether to bind to the specified interface.
|
|
*
|
|
* What Makes Good usb_device_id Tables:
|
|
*
|
|
* The match algorithm is very simple, so that intelligence in
|
|
* driver selection must come from smart driver id records.
|
|
* Unless you have good reasons to use another selection policy,
|
|
* provide match elements only in related groups, and order match
|
|
* specifiers from specific to general. Use the macros provided
|
|
* for that purpose if you can.
|
|
*
|
|
* The most specific match specifiers use device descriptor
|
|
* data. These are commonly used with product-specific matches;
|
|
* the USB_DEVICE macro lets you provide vendor and product IDs,
|
|
* and you can also match against ranges of product revisions.
|
|
* These are widely used for devices with application or vendor
|
|
* specific bDeviceClass values.
|
|
*
|
|
* Matches based on device class/subclass/protocol specifications
|
|
* are slightly more general; use the USB_DEVICE_INFO macro, or
|
|
* its siblings. These are used with single-function devices
|
|
* where bDeviceClass doesn't specify that each interface has
|
|
* its own class.
|
|
*
|
|
* Matches based on interface class/subclass/protocol are the
|
|
* most general; they let drivers bind to any interface on a
|
|
* multiple-function device. Use the USB_INTERFACE_INFO
|
|
* macro, or its siblings, to match class-per-interface style
|
|
* devices (as recorded in bInterfaceClass).
|
|
*
|
|
* Note that an entry created by USB_INTERFACE_INFO won't match
|
|
* any interface if the device class is set to Vendor-Specific.
|
|
* This is deliberate; according to the USB spec the meanings of
|
|
* the interface class/subclass/protocol for these devices are also
|
|
* vendor-specific, and hence matching against a standard product
|
|
* class wouldn't work anyway. If you really want to use an
|
|
* interface-based match for such a device, create a match record
|
|
* that also specifies the vendor ID. (Unforunately there isn't a
|
|
* standard macro for creating records like this.)
|
|
*
|
|
* Within those groups, remember that not all combinations are
|
|
* meaningful. For example, don't give a product version range
|
|
* without vendor and product IDs; or specify a protocol without
|
|
* its associated class and subclass.
|
|
*/
|
|
const struct usb_device_id *usb_match_id(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
/* proc_connectinfo in devio.c may call us with id == NULL. */
|
|
if (id == NULL)
|
|
return NULL;
|
|
|
|
/* It is important to check that id->driver_info is nonzero,
|
|
since an entry that is all zeroes except for a nonzero
|
|
id->driver_info is the way to create an entry that
|
|
indicates that the driver want to examine every
|
|
device and interface. */
|
|
for (; id->idVendor || id->idProduct || id->bDeviceClass ||
|
|
id->bInterfaceClass || id->driver_info; id++) {
|
|
if (usb_match_one_id(interface, id))
|
|
return id;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_match_id);
|
|
|
|
static int usb_device_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
/* devices and interfaces are handled separately */
|
|
if (is_usb_device(dev)) {
|
|
|
|
/* interface drivers never match devices */
|
|
if (!is_usb_device_driver(drv))
|
|
return 0;
|
|
|
|
/* TODO: Add real matching code */
|
|
return 1;
|
|
|
|
} else if (is_usb_interface(dev)) {
|
|
struct usb_interface *intf;
|
|
struct usb_driver *usb_drv;
|
|
const struct usb_device_id *id;
|
|
|
|
/* device drivers never match interfaces */
|
|
if (is_usb_device_driver(drv))
|
|
return 0;
|
|
|
|
intf = to_usb_interface(dev);
|
|
usb_drv = to_usb_driver(drv);
|
|
|
|
id = usb_match_id(intf, usb_drv->id_table);
|
|
if (id)
|
|
return 1;
|
|
|
|
id = usb_match_dynamic_id(intf, usb_drv);
|
|
if (id)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct usb_device *usb_dev;
|
|
|
|
if (is_usb_device(dev)) {
|
|
usb_dev = to_usb_device(dev);
|
|
} else if (is_usb_interface(dev)) {
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
|
|
usb_dev = interface_to_usbdev(intf);
|
|
} else {
|
|
return 0;
|
|
}
|
|
|
|
if (usb_dev->devnum < 0) {
|
|
/* driver is often null here; dev_dbg() would oops */
|
|
pr_debug("usb %s: already deleted?\n", dev_name(dev));
|
|
return -ENODEV;
|
|
}
|
|
if (!usb_dev->bus) {
|
|
pr_debug("usb %s: bus removed?\n", dev_name(dev));
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* per-device configurations are common */
|
|
if (add_uevent_var(env, "PRODUCT=%x/%x/%x",
|
|
le16_to_cpu(usb_dev->descriptor.idVendor),
|
|
le16_to_cpu(usb_dev->descriptor.idProduct),
|
|
le16_to_cpu(usb_dev->descriptor.bcdDevice)))
|
|
return -ENOMEM;
|
|
|
|
/* class-based driver binding models */
|
|
if (add_uevent_var(env, "TYPE=%d/%d/%d",
|
|
usb_dev->descriptor.bDeviceClass,
|
|
usb_dev->descriptor.bDeviceSubClass,
|
|
usb_dev->descriptor.bDeviceProtocol))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb_register_device_driver - register a USB device (not interface) driver
|
|
* @new_udriver: USB operations for the device driver
|
|
* @owner: module owner of this driver.
|
|
*
|
|
* Registers a USB device driver with the USB core. The list of
|
|
* unattached devices will be rescanned whenever a new driver is
|
|
* added, allowing the new driver to attach to any recognized devices.
|
|
*
|
|
* Return: A negative error code on failure and 0 on success.
|
|
*/
|
|
int usb_register_device_driver(struct usb_device_driver *new_udriver,
|
|
struct module *owner)
|
|
{
|
|
int retval = 0;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
new_udriver->drvwrap.for_devices = 1;
|
|
new_udriver->drvwrap.driver.name = new_udriver->name;
|
|
new_udriver->drvwrap.driver.bus = &usb_bus_type;
|
|
new_udriver->drvwrap.driver.probe = usb_probe_device;
|
|
new_udriver->drvwrap.driver.remove = usb_unbind_device;
|
|
new_udriver->drvwrap.driver.owner = owner;
|
|
|
|
retval = driver_register(&new_udriver->drvwrap.driver);
|
|
|
|
if (!retval)
|
|
pr_info("%s: registered new device driver %s\n",
|
|
usbcore_name, new_udriver->name);
|
|
else
|
|
printk(KERN_ERR "%s: error %d registering device "
|
|
" driver %s\n",
|
|
usbcore_name, retval, new_udriver->name);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_register_device_driver);
|
|
|
|
/**
|
|
* usb_deregister_device_driver - unregister a USB device (not interface) driver
|
|
* @udriver: USB operations of the device driver to unregister
|
|
* Context: must be able to sleep
|
|
*
|
|
* Unlinks the specified driver from the internal USB driver list.
|
|
*/
|
|
void usb_deregister_device_driver(struct usb_device_driver *udriver)
|
|
{
|
|
pr_info("%s: deregistering device driver %s\n",
|
|
usbcore_name, udriver->name);
|
|
|
|
driver_unregister(&udriver->drvwrap.driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_deregister_device_driver);
|
|
|
|
/**
|
|
* usb_register_driver - register a USB interface driver
|
|
* @new_driver: USB operations for the interface driver
|
|
* @owner: module owner of this driver.
|
|
* @mod_name: module name string
|
|
*
|
|
* Registers a USB interface driver with the USB core. The list of
|
|
* unattached interfaces will be rescanned whenever a new driver is
|
|
* added, allowing the new driver to attach to any recognized interfaces.
|
|
*
|
|
* Return: A negative error code on failure and 0 on success.
|
|
*
|
|
* NOTE: if you want your driver to use the USB major number, you must call
|
|
* usb_register_dev() to enable that functionality. This function no longer
|
|
* takes care of that.
|
|
*/
|
|
int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
|
|
const char *mod_name)
|
|
{
|
|
int retval = 0;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
new_driver->drvwrap.for_devices = 0;
|
|
new_driver->drvwrap.driver.name = new_driver->name;
|
|
new_driver->drvwrap.driver.bus = &usb_bus_type;
|
|
new_driver->drvwrap.driver.probe = usb_probe_interface;
|
|
new_driver->drvwrap.driver.remove = usb_unbind_interface;
|
|
new_driver->drvwrap.driver.owner = owner;
|
|
new_driver->drvwrap.driver.mod_name = mod_name;
|
|
spin_lock_init(&new_driver->dynids.lock);
|
|
INIT_LIST_HEAD(&new_driver->dynids.list);
|
|
|
|
retval = driver_register(&new_driver->drvwrap.driver);
|
|
if (retval)
|
|
goto out;
|
|
|
|
retval = usb_create_newid_files(new_driver);
|
|
if (retval)
|
|
goto out_newid;
|
|
|
|
pr_info("%s: registered new interface driver %s\n",
|
|
usbcore_name, new_driver->name);
|
|
|
|
out:
|
|
return retval;
|
|
|
|
out_newid:
|
|
driver_unregister(&new_driver->drvwrap.driver);
|
|
|
|
printk(KERN_ERR "%s: error %d registering interface "
|
|
" driver %s\n",
|
|
usbcore_name, retval, new_driver->name);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_register_driver);
|
|
|
|
/**
|
|
* usb_deregister - unregister a USB interface driver
|
|
* @driver: USB operations of the interface driver to unregister
|
|
* Context: must be able to sleep
|
|
*
|
|
* Unlinks the specified driver from the internal USB driver list.
|
|
*
|
|
* NOTE: If you called usb_register_dev(), you still need to call
|
|
* usb_deregister_dev() to clean up your driver's allocated minor numbers,
|
|
* this * call will no longer do it for you.
|
|
*/
|
|
void usb_deregister(struct usb_driver *driver)
|
|
{
|
|
pr_info("%s: deregistering interface driver %s\n",
|
|
usbcore_name, driver->name);
|
|
|
|
usb_remove_newid_files(driver);
|
|
driver_unregister(&driver->drvwrap.driver);
|
|
usb_free_dynids(driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_deregister);
|
|
|
|
/* Forced unbinding of a USB interface driver, either because
|
|
* it doesn't support pre_reset/post_reset/reset_resume or
|
|
* because it doesn't support suspend/resume.
|
|
*
|
|
* The caller must hold @intf's device's lock, but not @intf's lock.
|
|
*/
|
|
void usb_forced_unbind_intf(struct usb_interface *intf)
|
|
{
|
|
struct usb_driver *driver = to_usb_driver(intf->dev.driver);
|
|
|
|
dev_dbg(&intf->dev, "forced unbind\n");
|
|
usb_driver_release_interface(driver, intf);
|
|
|
|
/* Mark the interface for later rebinding */
|
|
intf->needs_binding = 1;
|
|
}
|
|
|
|
/*
|
|
* Unbind drivers for @udev's marked interfaces. These interfaces have
|
|
* the needs_binding flag set, for example by usb_resume_interface().
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
static void unbind_marked_interfaces(struct usb_device *udev)
|
|
{
|
|
struct usb_host_config *config;
|
|
int i;
|
|
struct usb_interface *intf;
|
|
|
|
config = udev->actconfig;
|
|
if (config) {
|
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) {
|
|
intf = config->interface[i];
|
|
if (intf->dev.driver && intf->needs_binding)
|
|
usb_forced_unbind_intf(intf);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Delayed forced unbinding of a USB interface driver and scan
|
|
* for rebinding.
|
|
*
|
|
* The caller must hold @intf's device's lock, but not @intf's lock.
|
|
*
|
|
* Note: Rebinds will be skipped if a system sleep transition is in
|
|
* progress and the PM "complete" callback hasn't occurred yet.
|
|
*/
|
|
static void usb_rebind_intf(struct usb_interface *intf)
|
|
{
|
|
int rc;
|
|
|
|
/* Delayed unbind of an existing driver */
|
|
if (intf->dev.driver)
|
|
usb_forced_unbind_intf(intf);
|
|
|
|
/* Try to rebind the interface */
|
|
if (!intf->dev.power.is_prepared) {
|
|
intf->needs_binding = 0;
|
|
rc = device_attach(&intf->dev);
|
|
if (rc < 0)
|
|
dev_warn(&intf->dev, "rebind failed: %d\n", rc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Rebind drivers to @udev's marked interfaces. These interfaces have
|
|
* the needs_binding flag set.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
static void rebind_marked_interfaces(struct usb_device *udev)
|
|
{
|
|
struct usb_host_config *config;
|
|
int i;
|
|
struct usb_interface *intf;
|
|
|
|
config = udev->actconfig;
|
|
if (config) {
|
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) {
|
|
intf = config->interface[i];
|
|
if (intf->needs_binding)
|
|
usb_rebind_intf(intf);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unbind all of @udev's marked interfaces and then rebind all of them.
|
|
* This ordering is necessary because some drivers claim several interfaces
|
|
* when they are first probed.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
void usb_unbind_and_rebind_marked_interfaces(struct usb_device *udev)
|
|
{
|
|
unbind_marked_interfaces(udev);
|
|
rebind_marked_interfaces(udev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
/* Unbind drivers for @udev's interfaces that don't support suspend/resume
|
|
* There is no check for reset_resume here because it can be determined
|
|
* only during resume whether reset_resume is needed.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
static void unbind_no_pm_drivers_interfaces(struct usb_device *udev)
|
|
{
|
|
struct usb_host_config *config;
|
|
int i;
|
|
struct usb_interface *intf;
|
|
struct usb_driver *drv;
|
|
|
|
config = udev->actconfig;
|
|
if (config) {
|
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) {
|
|
intf = config->interface[i];
|
|
|
|
if (intf->dev.driver) {
|
|
drv = to_usb_driver(intf->dev.driver);
|
|
if (!drv->suspend || !drv->resume)
|
|
usb_forced_unbind_intf(intf);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
struct usb_device_driver *udriver;
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED ||
|
|
udev->state == USB_STATE_SUSPENDED)
|
|
goto done;
|
|
|
|
/* For devices that don't have a driver, we do a generic suspend. */
|
|
if (udev->dev.driver)
|
|
udriver = to_usb_device_driver(udev->dev.driver);
|
|
else {
|
|
udev->do_remote_wakeup = 0;
|
|
udriver = &usb_generic_driver;
|
|
}
|
|
status = udriver->suspend(udev, msg);
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
struct usb_device_driver *udriver;
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED)
|
|
goto done;
|
|
|
|
/* Can't resume it if it doesn't have a driver. */
|
|
if (udev->dev.driver == NULL) {
|
|
status = -ENOTCONN;
|
|
goto done;
|
|
}
|
|
|
|
/* Non-root devices on a full/low-speed bus must wait for their
|
|
* companion high-speed root hub, in case a handoff is needed.
|
|
*/
|
|
if (!PMSG_IS_AUTO(msg) && udev->parent && udev->bus->hs_companion)
|
|
device_pm_wait_for_dev(&udev->dev,
|
|
&udev->bus->hs_companion->root_hub->dev);
|
|
|
|
if (udev->quirks & USB_QUIRK_RESET_RESUME)
|
|
udev->reset_resume = 1;
|
|
|
|
udriver = to_usb_device_driver(udev->dev.driver);
|
|
status = udriver->resume(udev, msg);
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
static int usb_suspend_interface(struct usb_device *udev,
|
|
struct usb_interface *intf, pm_message_t msg)
|
|
{
|
|
struct usb_driver *driver;
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED ||
|
|
intf->condition == USB_INTERFACE_UNBOUND)
|
|
goto done;
|
|
driver = to_usb_driver(intf->dev.driver);
|
|
|
|
/* at this time we know the driver supports suspend */
|
|
status = driver->suspend(intf, msg);
|
|
if (status && !PMSG_IS_AUTO(msg))
|
|
dev_err(&intf->dev, "suspend error %d\n", status);
|
|
|
|
done:
|
|
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
static int usb_resume_interface(struct usb_device *udev,
|
|
struct usb_interface *intf, pm_message_t msg, int reset_resume)
|
|
{
|
|
struct usb_driver *driver;
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED)
|
|
goto done;
|
|
|
|
/* Don't let autoresume interfere with unbinding */
|
|
if (intf->condition == USB_INTERFACE_UNBINDING)
|
|
goto done;
|
|
|
|
/* Can't resume it if it doesn't have a driver. */
|
|
if (intf->condition == USB_INTERFACE_UNBOUND) {
|
|
|
|
/* Carry out a deferred switch to altsetting 0 */
|
|
if (intf->needs_altsetting0 && !intf->dev.power.is_prepared) {
|
|
usb_set_interface(udev, intf->altsetting[0].
|
|
desc.bInterfaceNumber, 0);
|
|
intf->needs_altsetting0 = 0;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* Don't resume if the interface is marked for rebinding */
|
|
if (intf->needs_binding)
|
|
goto done;
|
|
driver = to_usb_driver(intf->dev.driver);
|
|
|
|
if (reset_resume) {
|
|
if (driver->reset_resume) {
|
|
status = driver->reset_resume(intf);
|
|
if (status)
|
|
dev_err(&intf->dev, "%s error %d\n",
|
|
"reset_resume", status);
|
|
} else {
|
|
intf->needs_binding = 1;
|
|
dev_dbg(&intf->dev, "no reset_resume for driver %s?\n",
|
|
driver->name);
|
|
}
|
|
} else {
|
|
status = driver->resume(intf);
|
|
if (status)
|
|
dev_err(&intf->dev, "resume error %d\n", status);
|
|
}
|
|
|
|
done:
|
|
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
|
|
|
|
/* Later we will unbind the driver and/or reprobe, if necessary */
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* usb_suspend_both - suspend a USB device and its interfaces
|
|
* @udev: the usb_device to suspend
|
|
* @msg: Power Management message describing this state transition
|
|
*
|
|
* This is the central routine for suspending USB devices. It calls the
|
|
* suspend methods for all the interface drivers in @udev and then calls
|
|
* the suspend method for @udev itself. When the routine is called in
|
|
* autosuspend, if an error occurs at any stage, all the interfaces
|
|
* which were suspended are resumed so that they remain in the same
|
|
* state as the device, but when called from system sleep, all error
|
|
* from suspend methods of interfaces and the non-root-hub device itself
|
|
* are simply ignored, so all suspended interfaces are only resumed
|
|
* to the device's state when @udev is root-hub and its suspend method
|
|
* returns failure.
|
|
*
|
|
* Autosuspend requests originating from a child device or an interface
|
|
* driver may be made without the protection of @udev's device lock, but
|
|
* all other suspend calls will hold the lock. Usbcore will insure that
|
|
* method calls do not arrive during bind, unbind, or reset operations.
|
|
* However drivers must be prepared to handle suspend calls arriving at
|
|
* unpredictable times.
|
|
*
|
|
* This routine can run only in process context.
|
|
*
|
|
* Return: 0 if the suspend succeeded.
|
|
*/
|
|
static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
int status = 0;
|
|
int i = 0, n = 0;
|
|
struct usb_interface *intf;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED ||
|
|
udev->state == USB_STATE_SUSPENDED)
|
|
goto done;
|
|
|
|
/* Suspend all the interfaces and then udev itself */
|
|
if (udev->actconfig) {
|
|
n = udev->actconfig->desc.bNumInterfaces;
|
|
for (i = n - 1; i >= 0; --i) {
|
|
intf = udev->actconfig->interface[i];
|
|
status = usb_suspend_interface(udev, intf, msg);
|
|
|
|
/* Ignore errors during system sleep transitions */
|
|
if (!PMSG_IS_AUTO(msg))
|
|
status = 0;
|
|
if (status != 0)
|
|
break;
|
|
}
|
|
}
|
|
if (status == 0) {
|
|
status = usb_suspend_device(udev, msg);
|
|
|
|
/*
|
|
* Ignore errors from non-root-hub devices during
|
|
* system sleep transitions. For the most part,
|
|
* these devices should go to low power anyway when
|
|
* the entire bus is suspended.
|
|
*/
|
|
if (udev->parent && !PMSG_IS_AUTO(msg))
|
|
status = 0;
|
|
}
|
|
|
|
/* If the suspend failed, resume interfaces that did get suspended */
|
|
if (status != 0) {
|
|
if (udev->actconfig) {
|
|
msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
|
|
while (++i < n) {
|
|
intf = udev->actconfig->interface[i];
|
|
usb_resume_interface(udev, intf, msg, 0);
|
|
}
|
|
}
|
|
|
|
/* If the suspend succeeded then prevent any more URB submissions
|
|
* and flush any outstanding URBs.
|
|
*/
|
|
} else {
|
|
udev->can_submit = 0;
|
|
for (i = 0; i < 16; ++i) {
|
|
usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
|
|
usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
|
|
}
|
|
}
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* usb_resume_both - resume a USB device and its interfaces
|
|
* @udev: the usb_device to resume
|
|
* @msg: Power Management message describing this state transition
|
|
*
|
|
* This is the central routine for resuming USB devices. It calls the
|
|
* the resume method for @udev and then calls the resume methods for all
|
|
* the interface drivers in @udev.
|
|
*
|
|
* Autoresume requests originating from a child device or an interface
|
|
* driver may be made without the protection of @udev's device lock, but
|
|
* all other resume calls will hold the lock. Usbcore will insure that
|
|
* method calls do not arrive during bind, unbind, or reset operations.
|
|
* However drivers must be prepared to handle resume calls arriving at
|
|
* unpredictable times.
|
|
*
|
|
* This routine can run only in process context.
|
|
*
|
|
* Return: 0 on success.
|
|
*/
|
|
static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
int status = 0;
|
|
int i;
|
|
struct usb_interface *intf;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED) {
|
|
status = -ENODEV;
|
|
goto done;
|
|
}
|
|
udev->can_submit = 1;
|
|
|
|
/* Resume the device */
|
|
if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume)
|
|
status = usb_resume_device(udev, msg);
|
|
|
|
/* Resume the interfaces */
|
|
if (status == 0 && udev->actconfig) {
|
|
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
|
|
intf = udev->actconfig->interface[i];
|
|
usb_resume_interface(udev, intf, msg,
|
|
udev->reset_resume);
|
|
}
|
|
}
|
|
usb_mark_last_busy(udev);
|
|
|
|
done:
|
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
|
|
if (!status)
|
|
udev->reset_resume = 0;
|
|
return status;
|
|
}
|
|
|
|
static void choose_wakeup(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
int w;
|
|
|
|
/* Remote wakeup is needed only when we actually go to sleep.
|
|
* For things like FREEZE and QUIESCE, if the device is already
|
|
* autosuspended then its current wakeup setting is okay.
|
|
*/
|
|
if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) {
|
|
if (udev->state != USB_STATE_SUSPENDED)
|
|
udev->do_remote_wakeup = 0;
|
|
return;
|
|
}
|
|
|
|
/* Enable remote wakeup if it is allowed, even if no interface drivers
|
|
* actually want it.
|
|
*/
|
|
w = device_may_wakeup(&udev->dev);
|
|
|
|
/* If the device is autosuspended with the wrong wakeup setting,
|
|
* autoresume now so the setting can be changed.
|
|
*/
|
|
if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup)
|
|
pm_runtime_resume(&udev->dev);
|
|
udev->do_remote_wakeup = w;
|
|
}
|
|
|
|
/* The device lock is held by the PM core */
|
|
int usb_suspend(struct device *dev, pm_message_t msg)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
|
|
unbind_no_pm_drivers_interfaces(udev);
|
|
|
|
/* From now on we are sure all drivers support suspend/resume
|
|
* but not necessarily reset_resume()
|
|
* so we may still need to unbind and rebind upon resume
|
|
*/
|
|
choose_wakeup(udev, msg);
|
|
return usb_suspend_both(udev, msg);
|
|
}
|
|
|
|
/* The device lock is held by the PM core */
|
|
int usb_resume_complete(struct device *dev)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
|
|
/* For PM complete calls, all we do is rebind interfaces
|
|
* whose needs_binding flag is set
|
|
*/
|
|
if (udev->state != USB_STATE_NOTATTACHED)
|
|
rebind_marked_interfaces(udev);
|
|
return 0;
|
|
}
|
|
|
|
/* The device lock is held by the PM core */
|
|
int usb_resume(struct device *dev, pm_message_t msg)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
int status;
|
|
|
|
/* For all calls, take the device back to full power and
|
|
* tell the PM core in case it was autosuspended previously.
|
|
* Unbind the interfaces that will need rebinding later,
|
|
* because they fail to support reset_resume.
|
|
* (This can't be done in usb_resume_interface()
|
|
* above because it doesn't own the right set of locks.)
|
|
*/
|
|
status = usb_resume_both(udev, msg);
|
|
if (status == 0) {
|
|
pm_runtime_disable(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
unbind_marked_interfaces(udev);
|
|
}
|
|
|
|
/* Avoid PM error messages for devices disconnected while suspended
|
|
* as we'll display regular disconnect messages just a bit later.
|
|
*/
|
|
if (status == -ENODEV || status == -ESHUTDOWN)
|
|
status = 0;
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* usb_enable_autosuspend - allow a USB device to be autosuspended
|
|
* @udev: the USB device which may be autosuspended
|
|
*
|
|
* This routine allows @udev to be autosuspended. An autosuspend won't
|
|
* take place until the autosuspend_delay has elapsed and all the other
|
|
* necessary conditions are satisfied.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
void usb_enable_autosuspend(struct usb_device *udev)
|
|
{
|
|
pm_runtime_allow(&udev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_enable_autosuspend);
|
|
|
|
/**
|
|
* usb_disable_autosuspend - prevent a USB device from being autosuspended
|
|
* @udev: the USB device which may not be autosuspended
|
|
*
|
|
* This routine prevents @udev from being autosuspended and wakes it up
|
|
* if it is already autosuspended.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*/
|
|
void usb_disable_autosuspend(struct usb_device *udev)
|
|
{
|
|
pm_runtime_forbid(&udev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_disable_autosuspend);
|
|
|
|
/**
|
|
* usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
|
|
* @udev: the usb_device to autosuspend
|
|
*
|
|
* This routine should be called when a core subsystem is finished using
|
|
* @udev and wants to allow it to autosuspend. Examples would be when
|
|
* @udev's device file in usbfs is closed or after a configuration change.
|
|
*
|
|
* @udev's usage counter is decremented; if it drops to 0 and all the
|
|
* interfaces are inactive then a delayed autosuspend will be attempted.
|
|
* The attempt may fail (see autosuspend_check()).
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*
|
|
* This routine can run only in process context.
|
|
*/
|
|
void usb_autosuspend_device(struct usb_device *udev)
|
|
{
|
|
int status;
|
|
|
|
usb_mark_last_busy(udev);
|
|
status = pm_runtime_put_sync_autosuspend(&udev->dev);
|
|
dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
|
|
__func__, atomic_read(&udev->dev.power.usage_count),
|
|
status);
|
|
}
|
|
|
|
/**
|
|
* usb_autoresume_device - immediately autoresume a USB device and its interfaces
|
|
* @udev: the usb_device to autoresume
|
|
*
|
|
* This routine should be called when a core subsystem wants to use @udev
|
|
* and needs to guarantee that it is not suspended. No autosuspend will
|
|
* occur until usb_autosuspend_device() is called. (Note that this will
|
|
* not prevent suspend events originating in the PM core.) Examples would
|
|
* be when @udev's device file in usbfs is opened or when a remote-wakeup
|
|
* request is received.
|
|
*
|
|
* @udev's usage counter is incremented to prevent subsequent autosuspends.
|
|
* However if the autoresume fails then the usage counter is re-decremented.
|
|
*
|
|
* The caller must hold @udev's device lock.
|
|
*
|
|
* This routine can run only in process context.
|
|
*
|
|
* Return: 0 on success. A negative error code otherwise.
|
|
*/
|
|
int usb_autoresume_device(struct usb_device *udev)
|
|
{
|
|
int status;
|
|
|
|
status = pm_runtime_get_sync(&udev->dev);
|
|
if (status < 0)
|
|
pm_runtime_put_sync(&udev->dev);
|
|
dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
|
|
__func__, atomic_read(&udev->dev.power.usage_count),
|
|
status);
|
|
if (status > 0)
|
|
status = 0;
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* usb_autopm_put_interface - decrement a USB interface's PM-usage counter
|
|
* @intf: the usb_interface whose counter should be decremented
|
|
*
|
|
* This routine should be called by an interface driver when it is
|
|
* finished using @intf and wants to allow it to autosuspend. A typical
|
|
* example would be a character-device driver when its device file is
|
|
* closed.
|
|
*
|
|
* The routine decrements @intf's usage counter. When the counter reaches
|
|
* 0, a delayed autosuspend request for @intf's device is attempted. The
|
|
* attempt may fail (see autosuspend_check()).
|
|
*
|
|
* This routine can run only in process context.
|
|
*/
|
|
void usb_autopm_put_interface(struct usb_interface *intf)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
int status;
|
|
|
|
usb_mark_last_busy(udev);
|
|
atomic_dec(&intf->pm_usage_cnt);
|
|
status = pm_runtime_put_sync(&intf->dev);
|
|
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
|
|
__func__, atomic_read(&intf->dev.power.usage_count),
|
|
status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
|
|
|
|
/**
|
|
* usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
|
|
* @intf: the usb_interface whose counter should be decremented
|
|
*
|
|
* This routine does much the same thing as usb_autopm_put_interface():
|
|
* It decrements @intf's usage counter and schedules a delayed
|
|
* autosuspend request if the counter is <= 0. The difference is that it
|
|
* does not perform any synchronization; callers should hold a private
|
|
* lock and handle all synchronization issues themselves.
|
|
*
|
|
* Typically a driver would call this routine during an URB's completion
|
|
* handler, if no more URBs were pending.
|
|
*
|
|
* This routine can run in atomic context.
|
|
*/
|
|
void usb_autopm_put_interface_async(struct usb_interface *intf)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
int status;
|
|
|
|
usb_mark_last_busy(udev);
|
|
atomic_dec(&intf->pm_usage_cnt);
|
|
status = pm_runtime_put(&intf->dev);
|
|
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
|
|
__func__, atomic_read(&intf->dev.power.usage_count),
|
|
status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
|
|
|
|
/**
|
|
* usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter
|
|
* @intf: the usb_interface whose counter should be decremented
|
|
*
|
|
* This routine decrements @intf's usage counter but does not carry out an
|
|
* autosuspend.
|
|
*
|
|
* This routine can run in atomic context.
|
|
*/
|
|
void usb_autopm_put_interface_no_suspend(struct usb_interface *intf)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
|
|
usb_mark_last_busy(udev);
|
|
atomic_dec(&intf->pm_usage_cnt);
|
|
pm_runtime_put_noidle(&intf->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend);
|
|
|
|
/**
|
|
* usb_autopm_get_interface - increment a USB interface's PM-usage counter
|
|
* @intf: the usb_interface whose counter should be incremented
|
|
*
|
|
* This routine should be called by an interface driver when it wants to
|
|
* use @intf and needs to guarantee that it is not suspended. In addition,
|
|
* the routine prevents @intf from being autosuspended subsequently. (Note
|
|
* that this will not prevent suspend events originating in the PM core.)
|
|
* This prevention will persist until usb_autopm_put_interface() is called
|
|
* or @intf is unbound. A typical example would be a character-device
|
|
* driver when its device file is opened.
|
|
*
|
|
* @intf's usage counter is incremented to prevent subsequent autosuspends.
|
|
* However if the autoresume fails then the counter is re-decremented.
|
|
*
|
|
* This routine can run only in process context.
|
|
*
|
|
* Return: 0 on success.
|
|
*/
|
|
int usb_autopm_get_interface(struct usb_interface *intf)
|
|
{
|
|
int status;
|
|
|
|
status = pm_runtime_get_sync(&intf->dev);
|
|
if (status < 0)
|
|
pm_runtime_put_sync(&intf->dev);
|
|
else
|
|
atomic_inc(&intf->pm_usage_cnt);
|
|
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
|
|
__func__, atomic_read(&intf->dev.power.usage_count),
|
|
status);
|
|
if (status > 0)
|
|
status = 0;
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
|
|
|
|
/**
|
|
* usb_autopm_get_interface_async - increment a USB interface's PM-usage counter
|
|
* @intf: the usb_interface whose counter should be incremented
|
|
*
|
|
* This routine does much the same thing as
|
|
* usb_autopm_get_interface(): It increments @intf's usage counter and
|
|
* queues an autoresume request if the device is suspended. The
|
|
* differences are that it does not perform any synchronization (callers
|
|
* should hold a private lock and handle all synchronization issues
|
|
* themselves), and it does not autoresume the device directly (it only
|
|
* queues a request). After a successful call, the device may not yet be
|
|
* resumed.
|
|
*
|
|
* This routine can run in atomic context.
|
|
*
|
|
* Return: 0 on success. A negative error code otherwise.
|
|
*/
|
|
int usb_autopm_get_interface_async(struct usb_interface *intf)
|
|
{
|
|
int status;
|
|
|
|
status = pm_runtime_get(&intf->dev);
|
|
if (status < 0 && status != -EINPROGRESS)
|
|
pm_runtime_put_noidle(&intf->dev);
|
|
else
|
|
atomic_inc(&intf->pm_usage_cnt);
|
|
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
|
|
__func__, atomic_read(&intf->dev.power.usage_count),
|
|
status);
|
|
if (status > 0 || status == -EINPROGRESS)
|
|
status = 0;
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async);
|
|
|
|
/**
|
|
* usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter
|
|
* @intf: the usb_interface whose counter should be incremented
|
|
*
|
|
* This routine increments @intf's usage counter but does not carry out an
|
|
* autoresume.
|
|
*
|
|
* This routine can run in atomic context.
|
|
*/
|
|
void usb_autopm_get_interface_no_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
|
|
usb_mark_last_busy(udev);
|
|
atomic_inc(&intf->pm_usage_cnt);
|
|
pm_runtime_get_noresume(&intf->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume);
|
|
|
|
/* Internal routine to check whether we may autosuspend a device. */
|
|
static int autosuspend_check(struct usb_device *udev)
|
|
{
|
|
int w, i;
|
|
struct usb_interface *intf;
|
|
|
|
/* Fail if autosuspend is disabled, or any interfaces are in use, or
|
|
* any interface drivers require remote wakeup but it isn't available.
|
|
*/
|
|
w = 0;
|
|
if (udev->actconfig) {
|
|
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
|
|
intf = udev->actconfig->interface[i];
|
|
|
|
/* We don't need to check interfaces that are
|
|
* disabled for runtime PM. Either they are unbound
|
|
* or else their drivers don't support autosuspend
|
|
* and so they are permanently active.
|
|
*/
|
|
if (intf->dev.power.disable_depth)
|
|
continue;
|
|
if (atomic_read(&intf->dev.power.usage_count) > 0)
|
|
return -EBUSY;
|
|
w |= intf->needs_remote_wakeup;
|
|
|
|
/* Don't allow autosuspend if the device will need
|
|
* a reset-resume and any of its interface drivers
|
|
* doesn't include support or needs remote wakeup.
|
|
*/
|
|
if (udev->quirks & USB_QUIRK_RESET_RESUME) {
|
|
struct usb_driver *driver;
|
|
|
|
driver = to_usb_driver(intf->dev.driver);
|
|
if (!driver->reset_resume ||
|
|
intf->needs_remote_wakeup)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
}
|
|
if (w && !device_can_wakeup(&udev->dev)) {
|
|
dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/*
|
|
* If the device is a direct child of the root hub and the HCD
|
|
* doesn't handle wakeup requests, don't allow autosuspend when
|
|
* wakeup is needed.
|
|
*/
|
|
if (w && udev->parent == udev->bus->root_hub &&
|
|
bus_to_hcd(udev->bus)->cant_recv_wakeups) {
|
|
dev_dbg(&udev->dev, "HCD doesn't handle wakeup requests\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
udev->do_remote_wakeup = w;
|
|
return 0;
|
|
}
|
|
|
|
int usb_runtime_suspend(struct device *dev)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
int status;
|
|
|
|
/* A USB device can be suspended if it passes the various autosuspend
|
|
* checks. Runtime suspend for a USB device means suspending all the
|
|
* interfaces and then the device itself.
|
|
*/
|
|
if (autosuspend_check(udev) != 0)
|
|
return -EAGAIN;
|
|
|
|
status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
|
|
|
|
/* Allow a retry if autosuspend failed temporarily */
|
|
if (status == -EAGAIN || status == -EBUSY)
|
|
usb_mark_last_busy(udev);
|
|
|
|
/*
|
|
* The PM core reacts badly unless the return code is 0,
|
|
* -EAGAIN, or -EBUSY, so always return -EBUSY on an error
|
|
* (except for root hubs, because they don't suspend through
|
|
* an upstream port like other USB devices).
|
|
*/
|
|
if (status != 0 && udev->parent)
|
|
return -EBUSY;
|
|
return status;
|
|
}
|
|
|
|
int usb_runtime_resume(struct device *dev)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
int status;
|
|
|
|
/* Runtime resume for a USB device means resuming both the device
|
|
* and all its interfaces.
|
|
*/
|
|
status = usb_resume_both(udev, PMSG_AUTO_RESUME);
|
|
return status;
|
|
}
|
|
|
|
int usb_runtime_idle(struct device *dev)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
|
|
/* An idle USB device can be suspended if it passes the various
|
|
* autosuspend checks.
|
|
*/
|
|
if (autosuspend_check(udev) == 0)
|
|
pm_runtime_autosuspend(dev);
|
|
/* Tell the core not to suspend it, though. */
|
|
return -EBUSY;
|
|
}
|
|
|
|
int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
int ret = -EPERM;
|
|
|
|
if (enable && !udev->usb2_hw_lpm_allowed)
|
|
return 0;
|
|
|
|
if (hcd->driver->set_usb2_hw_lpm) {
|
|
ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable);
|
|
if (!ret)
|
|
udev->usb2_hw_lpm_enabled = enable;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
struct bus_type usb_bus_type = {
|
|
.name = "usb",
|
|
.match = usb_device_match,
|
|
.uevent = usb_uevent,
|
|
};
|