![Oliver Neukum](/assets/img/avatar_default.png)
Quting the relevant thread: > In fact, I suspect the locking added by the kernel 3.13 commit for > read_descriptors() is invalid because read_descriptors() performs no USB > activity; read_descriptors() just reads information from an allocated > memory structure. This structure is protected as the structure is > existing before and after the sysfs vfs descriptors entry is created or > destroyed. You're right. For some reason I thought that usb_deauthorize_device() would destroy the rawdescriptor structures (as mentioned in that commit's Changelog), but it doesn't. The locking in read_descriptors() is unnecessary. > The information is only written at the time of enumeration > and does not change. At least that is my understanding. > > It is noted that in our testing of kernel 3.8 on ARM, that sysfs > read_descriptors() was non-blocking because the kernel 3.13 comment was > not there. > > The pre-kernel 3.13 sysfs read_descriptors() seemed to work OK. > > Proposal: > ========= > > Remove the usb_lock_device(udev) and usb_unlock_device(udev) from > devices/usb/core/sysfs.c in read_descriptors() that was added by the > kernel 3.13 commit > "232275a USB: fix substandard locking for the sysfs files" > > Any comments to this proposal ? It seems okay to me. Please submit a patch. So this removes the locking making the point about -EINTR in the first path moot. Signed-off-by: Oliver Neukum <oneukum@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1114 lines
27 KiB
C
1114 lines
27 KiB
C
/*
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* drivers/usb/core/sysfs.c
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*
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* (C) Copyright 2002 David Brownell
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* (C) Copyright 2002,2004 Greg Kroah-Hartman
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* (C) Copyright 2002,2004 IBM Corp.
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*
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* All of the sysfs file attributes for usb devices and interfaces.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/usb.h>
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#include <linux/usb/quirks.h>
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#include "usb.h"
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/* Active configuration fields */
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#define usb_actconfig_show(field, format_string) \
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static ssize_t field##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct usb_device *udev; \
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struct usb_host_config *actconfig; \
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ssize_t rc; \
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\
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udev = to_usb_device(dev); \
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rc = usb_lock_device_interruptible(udev); \
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if (rc < 0) \
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return -EINTR; \
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actconfig = udev->actconfig; \
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if (actconfig) \
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rc = sprintf(buf, format_string, \
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actconfig->desc.field); \
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usb_unlock_device(udev); \
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return rc; \
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} \
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#define usb_actconfig_attr(field, format_string) \
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usb_actconfig_show(field, format_string) \
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static DEVICE_ATTR_RO(field)
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usb_actconfig_attr(bNumInterfaces, "%2d\n");
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usb_actconfig_attr(bmAttributes, "%2x\n");
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static ssize_t bMaxPower_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev;
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struct usb_host_config *actconfig;
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ssize_t rc;
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udev = to_usb_device(dev);
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rc = usb_lock_device_interruptible(udev);
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if (rc < 0)
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return -EINTR;
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actconfig = udev->actconfig;
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if (actconfig)
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rc = sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
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usb_unlock_device(udev);
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return rc;
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}
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static DEVICE_ATTR_RO(bMaxPower);
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static ssize_t configuration_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev;
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struct usb_host_config *actconfig;
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ssize_t rc;
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udev = to_usb_device(dev);
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rc = usb_lock_device_interruptible(udev);
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if (rc < 0)
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return -EINTR;
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actconfig = udev->actconfig;
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if (actconfig && actconfig->string)
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rc = sprintf(buf, "%s\n", actconfig->string);
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usb_unlock_device(udev);
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return rc;
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}
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static DEVICE_ATTR_RO(configuration);
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/* configuration value is always present, and r/w */
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usb_actconfig_show(bConfigurationValue, "%u\n");
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static ssize_t bConfigurationValue_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct usb_device *udev = to_usb_device(dev);
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int config, value, rc;
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if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
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return -EINVAL;
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rc = usb_lock_device_interruptible(udev);
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if (rc < 0)
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return -EINTR;
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value = usb_set_configuration(udev, config);
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usb_unlock_device(udev);
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return (value < 0) ? value : count;
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}
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static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
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bConfigurationValue_show, bConfigurationValue_store);
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/* String fields */
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#define usb_string_attr(name) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct usb_device *udev; \
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int retval; \
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\
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udev = to_usb_device(dev); \
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retval = usb_lock_device_interruptible(udev); \
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if (retval < 0) \
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return -EINTR; \
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retval = sprintf(buf, "%s\n", udev->name); \
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usb_unlock_device(udev); \
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return retval; \
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} \
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static DEVICE_ATTR_RO(name)
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usb_string_attr(product);
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usb_string_attr(manufacturer);
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usb_string_attr(serial);
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static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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char *speed;
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udev = to_usb_device(dev);
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switch (udev->speed) {
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case USB_SPEED_LOW:
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speed = "1.5";
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break;
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case USB_SPEED_UNKNOWN:
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case USB_SPEED_FULL:
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speed = "12";
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break;
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case USB_SPEED_HIGH:
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speed = "480";
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break;
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case USB_SPEED_WIRELESS:
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speed = "480";
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break;
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case USB_SPEED_SUPER:
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speed = "5000";
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break;
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case USB_SPEED_SUPER_PLUS:
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speed = "10000";
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break;
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default:
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speed = "unknown";
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}
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return sprintf(buf, "%s\n", speed);
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}
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static DEVICE_ATTR_RO(speed);
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static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "%d\n", udev->bus->busnum);
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}
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static DEVICE_ATTR_RO(busnum);
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static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "%d\n", udev->devnum);
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}
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static DEVICE_ATTR_RO(devnum);
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static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "%s\n", udev->devpath);
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}
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static DEVICE_ATTR_RO(devpath);
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static ssize_t version_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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u16 bcdUSB;
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udev = to_usb_device(dev);
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bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);
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return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);
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}
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static DEVICE_ATTR_RO(version);
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static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "%d\n", udev->maxchild);
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}
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static DEVICE_ATTR_RO(maxchild);
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static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "0x%x\n", udev->quirks);
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}
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static DEVICE_ATTR_RO(quirks);
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static ssize_t avoid_reset_quirk_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));
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}
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static ssize_t avoid_reset_quirk_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct usb_device *udev = to_usb_device(dev);
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int val, rc;
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if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
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return -EINVAL;
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rc = usb_lock_device_interruptible(udev);
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if (rc < 0)
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return -EINTR;
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if (val)
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udev->quirks |= USB_QUIRK_RESET;
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else
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udev->quirks &= ~USB_QUIRK_RESET;
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usb_unlock_device(udev);
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return count;
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}
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static DEVICE_ATTR_RW(avoid_reset_quirk);
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static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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udev = to_usb_device(dev);
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return sprintf(buf, "%d\n", atomic_read(&udev->urbnum));
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}
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static DEVICE_ATTR_RO(urbnum);
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static ssize_t removable_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev;
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char *state;
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udev = to_usb_device(dev);
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switch (udev->removable) {
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case USB_DEVICE_REMOVABLE:
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state = "removable";
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break;
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case USB_DEVICE_FIXED:
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state = "fixed";
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break;
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default:
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state = "unknown";
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}
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return sprintf(buf, "%s\n", state);
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}
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static DEVICE_ATTR_RO(removable);
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static ssize_t ltm_capable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (usb_device_supports_ltm(to_usb_device(dev)))
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return sprintf(buf, "%s\n", "yes");
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return sprintf(buf, "%s\n", "no");
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}
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static DEVICE_ATTR_RO(ltm_capable);
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#ifdef CONFIG_PM
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static ssize_t persist_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev = to_usb_device(dev);
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return sprintf(buf, "%d\n", udev->persist_enabled);
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}
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static ssize_t persist_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct usb_device *udev = to_usb_device(dev);
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int value, rc;
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/* Hubs are always enabled for USB_PERSIST */
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if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
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return -EPERM;
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if (sscanf(buf, "%d", &value) != 1)
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return -EINVAL;
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rc = usb_lock_device_interruptible(udev);
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if (rc < 0)
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return -EINTR;
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udev->persist_enabled = !!value;
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usb_unlock_device(udev);
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return count;
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}
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static DEVICE_ATTR_RW(persist);
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static int add_persist_attributes(struct device *dev)
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{
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int rc = 0;
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if (is_usb_device(dev)) {
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struct usb_device *udev = to_usb_device(dev);
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/* Hubs are automatically enabled for USB_PERSIST,
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* no point in creating the attribute file.
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*/
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if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)
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rc = sysfs_add_file_to_group(&dev->kobj,
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&dev_attr_persist.attr,
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power_group_name);
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}
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return rc;
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}
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static void remove_persist_attributes(struct device *dev)
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{
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sysfs_remove_file_from_group(&dev->kobj,
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&dev_attr_persist.attr,
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power_group_name);
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}
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static ssize_t connected_duration_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev = to_usb_device(dev);
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return sprintf(buf, "%u\n",
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jiffies_to_msecs(jiffies - udev->connect_time));
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}
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static DEVICE_ATTR_RO(connected_duration);
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/*
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* If the device is resumed, the last time the device was suspended has
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* been pre-subtracted from active_duration. We add the current time to
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* get the duration that the device was actually active.
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*
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* If the device is suspended, the active_duration is up-to-date.
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*/
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static ssize_t active_duration_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev = to_usb_device(dev);
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int duration;
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if (udev->state != USB_STATE_SUSPENDED)
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duration = jiffies_to_msecs(jiffies + udev->active_duration);
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else
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duration = jiffies_to_msecs(udev->active_duration);
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return sprintf(buf, "%u\n", duration);
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}
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static DEVICE_ATTR_RO(active_duration);
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static ssize_t autosuspend_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
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}
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static ssize_t autosuspend_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t count)
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{
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int value;
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if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||
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value <= -INT_MAX/1000)
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return -EINVAL;
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pm_runtime_set_autosuspend_delay(dev, value * 1000);
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return count;
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}
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static DEVICE_ATTR_RW(autosuspend);
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static const char on_string[] = "on";
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static const char auto_string[] = "auto";
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static void warn_level(void)
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{
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static int level_warned;
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if (!level_warned) {
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level_warned = 1;
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printk(KERN_WARNING "WARNING! power/level is deprecated; "
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"use power/control instead\n");
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}
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}
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static ssize_t level_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb_device *udev = to_usb_device(dev);
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const char *p = auto_string;
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warn_level();
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if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)
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p = on_string;
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return sprintf(buf, "%s\n", p);
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}
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static ssize_t level_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct usb_device *udev = to_usb_device(dev);
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int len = count;
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char *cp;
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int rc = count;
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int rv;
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warn_level();
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cp = memchr(buf, '\n', count);
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if (cp)
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len = cp - buf;
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rv = usb_lock_device_interruptible(udev);
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if (rv < 0)
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return -EINTR;
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if (len == sizeof on_string - 1 &&
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strncmp(buf, on_string, len) == 0)
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usb_disable_autosuspend(udev);
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else if (len == sizeof auto_string - 1 &&
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strncmp(buf, auto_string, len) == 0)
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usb_enable_autosuspend(udev);
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else
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rc = -EINVAL;
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usb_unlock_device(udev);
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return rc;
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}
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static DEVICE_ATTR_RW(level);
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static ssize_t usb2_hardware_lpm_show(struct device *dev,
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struct device_attribute *attr, char *buf)
|
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{
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struct usb_device *udev = to_usb_device(dev);
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const char *p;
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|
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if (udev->usb2_hw_lpm_allowed == 1)
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p = "enabled";
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else
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p = "disabled";
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return sprintf(buf, "%s\n", p);
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}
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|
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static ssize_t usb2_hardware_lpm_store(struct device *dev,
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struct device_attribute *attr,
|
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const char *buf, size_t count)
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|
{
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|
struct usb_device *udev = to_usb_device(dev);
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bool value;
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int ret;
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|
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ret = usb_lock_device_interruptible(udev);
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if (ret < 0)
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return -EINTR;
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|
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ret = strtobool(buf, &value);
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|
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if (!ret) {
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udev->usb2_hw_lpm_allowed = value;
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ret = usb_set_usb2_hardware_lpm(udev, value);
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}
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usb_unlock_device(udev);
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|
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if (!ret)
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return count;
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|
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return ret;
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}
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static DEVICE_ATTR_RW(usb2_hardware_lpm);
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static ssize_t usb2_lpm_l1_timeout_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
return sprintf(buf, "%d\n", udev->l1_params.timeout);
|
|
}
|
|
|
|
static ssize_t usb2_lpm_l1_timeout_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
u16 timeout;
|
|
|
|
if (kstrtou16(buf, 0, &timeout))
|
|
return -EINVAL;
|
|
|
|
udev->l1_params.timeout = timeout;
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RW(usb2_lpm_l1_timeout);
|
|
|
|
static ssize_t usb2_lpm_besl_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
return sprintf(buf, "%d\n", udev->l1_params.besl);
|
|
}
|
|
|
|
static ssize_t usb2_lpm_besl_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
u8 besl;
|
|
|
|
if (kstrtou8(buf, 0, &besl) || besl > 15)
|
|
return -EINVAL;
|
|
|
|
udev->l1_params.besl = besl;
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RW(usb2_lpm_besl);
|
|
|
|
static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
const char *p;
|
|
int rc;
|
|
|
|
rc = usb_lock_device_interruptible(udev);
|
|
if (rc < 0)
|
|
return -EINTR;
|
|
|
|
if (udev->usb3_lpm_u1_enabled)
|
|
p = "enabled";
|
|
else
|
|
p = "disabled";
|
|
|
|
usb_unlock_device(udev);
|
|
|
|
return sprintf(buf, "%s\n", p);
|
|
}
|
|
static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
|
|
|
|
static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
const char *p;
|
|
int rc;
|
|
|
|
rc = usb_lock_device_interruptible(udev);
|
|
if (rc < 0)
|
|
return -EINTR;
|
|
|
|
if (udev->usb3_lpm_u2_enabled)
|
|
p = "enabled";
|
|
else
|
|
p = "disabled";
|
|
|
|
usb_unlock_device(udev);
|
|
|
|
return sprintf(buf, "%s\n", p);
|
|
}
|
|
static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
|
|
|
|
static struct attribute *usb2_hardware_lpm_attr[] = {
|
|
&dev_attr_usb2_hardware_lpm.attr,
|
|
&dev_attr_usb2_lpm_l1_timeout.attr,
|
|
&dev_attr_usb2_lpm_besl.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group usb2_hardware_lpm_attr_group = {
|
|
.name = power_group_name,
|
|
.attrs = usb2_hardware_lpm_attr,
|
|
};
|
|
|
|
static struct attribute *usb3_hardware_lpm_attr[] = {
|
|
&dev_attr_usb3_hardware_lpm_u1.attr,
|
|
&dev_attr_usb3_hardware_lpm_u2.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group usb3_hardware_lpm_attr_group = {
|
|
.name = power_group_name,
|
|
.attrs = usb3_hardware_lpm_attr,
|
|
};
|
|
|
|
static struct attribute *power_attrs[] = {
|
|
&dev_attr_autosuspend.attr,
|
|
&dev_attr_level.attr,
|
|
&dev_attr_connected_duration.attr,
|
|
&dev_attr_active_duration.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group power_attr_group = {
|
|
.name = power_group_name,
|
|
.attrs = power_attrs,
|
|
};
|
|
|
|
static int add_power_attributes(struct device *dev)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (is_usb_device(dev)) {
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
|
|
if (udev->usb2_hw_lpm_capable == 1)
|
|
rc = sysfs_merge_group(&dev->kobj,
|
|
&usb2_hardware_lpm_attr_group);
|
|
if (udev->speed == USB_SPEED_SUPER &&
|
|
udev->lpm_capable == 1)
|
|
rc = sysfs_merge_group(&dev->kobj,
|
|
&usb3_hardware_lpm_attr_group);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void remove_power_attributes(struct device *dev)
|
|
{
|
|
sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
|
|
sysfs_unmerge_group(&dev->kobj, &power_attr_group);
|
|
}
|
|
|
|
#else
|
|
|
|
#define add_persist_attributes(dev) 0
|
|
#define remove_persist_attributes(dev) do {} while (0)
|
|
|
|
#define add_power_attributes(dev) 0
|
|
#define remove_power_attributes(dev) do {} while (0)
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
|
|
/* Descriptor fields */
|
|
#define usb_descriptor_attr_le16(field, format_string) \
|
|
static ssize_t \
|
|
field##_show(struct device *dev, struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct usb_device *udev; \
|
|
\
|
|
udev = to_usb_device(dev); \
|
|
return sprintf(buf, format_string, \
|
|
le16_to_cpu(udev->descriptor.field)); \
|
|
} \
|
|
static DEVICE_ATTR_RO(field)
|
|
|
|
usb_descriptor_attr_le16(idVendor, "%04x\n");
|
|
usb_descriptor_attr_le16(idProduct, "%04x\n");
|
|
usb_descriptor_attr_le16(bcdDevice, "%04x\n");
|
|
|
|
#define usb_descriptor_attr(field, format_string) \
|
|
static ssize_t \
|
|
field##_show(struct device *dev, struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct usb_device *udev; \
|
|
\
|
|
udev = to_usb_device(dev); \
|
|
return sprintf(buf, format_string, udev->descriptor.field); \
|
|
} \
|
|
static DEVICE_ATTR_RO(field)
|
|
|
|
usb_descriptor_attr(bDeviceClass, "%02x\n");
|
|
usb_descriptor_attr(bDeviceSubClass, "%02x\n");
|
|
usb_descriptor_attr(bDeviceProtocol, "%02x\n");
|
|
usb_descriptor_attr(bNumConfigurations, "%d\n");
|
|
usb_descriptor_attr(bMaxPacketSize0, "%d\n");
|
|
|
|
|
|
/* show if the device is authorized (1) or not (0) */
|
|
static ssize_t authorized_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_device *usb_dev = to_usb_device(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
|
|
}
|
|
|
|
/*
|
|
* Authorize a device to be used in the system
|
|
*
|
|
* Writing a 0 deauthorizes the device, writing a 1 authorizes it.
|
|
*/
|
|
static ssize_t authorized_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf,
|
|
size_t size)
|
|
{
|
|
ssize_t result;
|
|
struct usb_device *usb_dev = to_usb_device(dev);
|
|
unsigned val;
|
|
result = sscanf(buf, "%u\n", &val);
|
|
if (result != 1)
|
|
result = -EINVAL;
|
|
else if (val == 0)
|
|
result = usb_deauthorize_device(usb_dev);
|
|
else
|
|
result = usb_authorize_device(usb_dev);
|
|
return result < 0 ? result : size;
|
|
}
|
|
static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
|
|
authorized_show, authorized_store);
|
|
|
|
/* "Safely remove a device" */
|
|
static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
int rc = 0;
|
|
|
|
usb_lock_device(udev);
|
|
if (udev->state != USB_STATE_NOTATTACHED) {
|
|
|
|
/* To avoid races, first unconfigure and then remove */
|
|
usb_set_configuration(udev, -1);
|
|
rc = usb_remove_device(udev);
|
|
}
|
|
if (rc == 0)
|
|
rc = count;
|
|
usb_unlock_device(udev);
|
|
return rc;
|
|
}
|
|
static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store);
|
|
|
|
|
|
static struct attribute *dev_attrs[] = {
|
|
/* current configuration's attributes */
|
|
&dev_attr_configuration.attr,
|
|
&dev_attr_bNumInterfaces.attr,
|
|
&dev_attr_bConfigurationValue.attr,
|
|
&dev_attr_bmAttributes.attr,
|
|
&dev_attr_bMaxPower.attr,
|
|
/* device attributes */
|
|
&dev_attr_urbnum.attr,
|
|
&dev_attr_idVendor.attr,
|
|
&dev_attr_idProduct.attr,
|
|
&dev_attr_bcdDevice.attr,
|
|
&dev_attr_bDeviceClass.attr,
|
|
&dev_attr_bDeviceSubClass.attr,
|
|
&dev_attr_bDeviceProtocol.attr,
|
|
&dev_attr_bNumConfigurations.attr,
|
|
&dev_attr_bMaxPacketSize0.attr,
|
|
&dev_attr_speed.attr,
|
|
&dev_attr_busnum.attr,
|
|
&dev_attr_devnum.attr,
|
|
&dev_attr_devpath.attr,
|
|
&dev_attr_version.attr,
|
|
&dev_attr_maxchild.attr,
|
|
&dev_attr_quirks.attr,
|
|
&dev_attr_avoid_reset_quirk.attr,
|
|
&dev_attr_authorized.attr,
|
|
&dev_attr_remove.attr,
|
|
&dev_attr_removable.attr,
|
|
&dev_attr_ltm_capable.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group dev_attr_grp = {
|
|
.attrs = dev_attrs,
|
|
};
|
|
|
|
/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
|
|
* accordingly.
|
|
*/
|
|
static struct attribute *dev_string_attrs[] = {
|
|
&dev_attr_manufacturer.attr,
|
|
&dev_attr_product.attr,
|
|
&dev_attr_serial.attr,
|
|
NULL
|
|
};
|
|
|
|
static umode_t dev_string_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
|
|
if (a == &dev_attr_manufacturer.attr) {
|
|
if (udev->manufacturer == NULL)
|
|
return 0;
|
|
} else if (a == &dev_attr_product.attr) {
|
|
if (udev->product == NULL)
|
|
return 0;
|
|
} else if (a == &dev_attr_serial.attr) {
|
|
if (udev->serial == NULL)
|
|
return 0;
|
|
}
|
|
return a->mode;
|
|
}
|
|
|
|
static struct attribute_group dev_string_attr_grp = {
|
|
.attrs = dev_string_attrs,
|
|
.is_visible = dev_string_attrs_are_visible,
|
|
};
|
|
|
|
const struct attribute_group *usb_device_groups[] = {
|
|
&dev_attr_grp,
|
|
&dev_string_attr_grp,
|
|
NULL
|
|
};
|
|
|
|
/* Binary descriptors */
|
|
|
|
static ssize_t
|
|
read_descriptors(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct usb_device *udev = to_usb_device(dev);
|
|
size_t nleft = count;
|
|
size_t srclen, n;
|
|
int cfgno;
|
|
void *src;
|
|
|
|
/* The binary attribute begins with the device descriptor.
|
|
* Following that are the raw descriptor entries for all the
|
|
* configurations (config plus subsidiary descriptors).
|
|
*/
|
|
for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
|
|
nleft > 0; ++cfgno) {
|
|
if (cfgno < 0) {
|
|
src = &udev->descriptor;
|
|
srclen = sizeof(struct usb_device_descriptor);
|
|
} else {
|
|
src = udev->rawdescriptors[cfgno];
|
|
srclen = __le16_to_cpu(udev->config[cfgno].desc.
|
|
wTotalLength);
|
|
}
|
|
if (off < srclen) {
|
|
n = min(nleft, srclen - (size_t) off);
|
|
memcpy(buf, src + off, n);
|
|
nleft -= n;
|
|
buf += n;
|
|
off = 0;
|
|
} else {
|
|
off -= srclen;
|
|
}
|
|
}
|
|
return count - nleft;
|
|
}
|
|
|
|
static struct bin_attribute dev_bin_attr_descriptors = {
|
|
.attr = {.name = "descriptors", .mode = 0444},
|
|
.read = read_descriptors,
|
|
.size = 18 + 65535, /* dev descr + max-size raw descriptor */
|
|
};
|
|
|
|
int usb_create_sysfs_dev_files(struct usb_device *udev)
|
|
{
|
|
struct device *dev = &udev->dev;
|
|
int retval;
|
|
|
|
retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
|
|
if (retval)
|
|
goto error;
|
|
|
|
retval = add_persist_attributes(dev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
retval = add_power_attributes(dev);
|
|
if (retval)
|
|
goto error;
|
|
return retval;
|
|
error:
|
|
usb_remove_sysfs_dev_files(udev);
|
|
return retval;
|
|
}
|
|
|
|
void usb_remove_sysfs_dev_files(struct usb_device *udev)
|
|
{
|
|
struct device *dev = &udev->dev;
|
|
|
|
remove_power_attributes(dev);
|
|
remove_persist_attributes(dev);
|
|
device_remove_bin_file(dev, &dev_bin_attr_descriptors);
|
|
}
|
|
|
|
/* Interface Association Descriptor fields */
|
|
#define usb_intf_assoc_attr(field, format_string) \
|
|
static ssize_t \
|
|
iad_##field##_show(struct device *dev, struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct usb_interface *intf = to_usb_interface(dev); \
|
|
\
|
|
return sprintf(buf, format_string, \
|
|
intf->intf_assoc->field); \
|
|
} \
|
|
static DEVICE_ATTR_RO(iad_##field)
|
|
|
|
usb_intf_assoc_attr(bFirstInterface, "%02x\n");
|
|
usb_intf_assoc_attr(bInterfaceCount, "%02d\n");
|
|
usb_intf_assoc_attr(bFunctionClass, "%02x\n");
|
|
usb_intf_assoc_attr(bFunctionSubClass, "%02x\n");
|
|
usb_intf_assoc_attr(bFunctionProtocol, "%02x\n");
|
|
|
|
/* Interface fields */
|
|
#define usb_intf_attr(field, format_string) \
|
|
static ssize_t \
|
|
field##_show(struct device *dev, struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct usb_interface *intf = to_usb_interface(dev); \
|
|
\
|
|
return sprintf(buf, format_string, \
|
|
intf->cur_altsetting->desc.field); \
|
|
} \
|
|
static DEVICE_ATTR_RO(field)
|
|
|
|
usb_intf_attr(bInterfaceNumber, "%02x\n");
|
|
usb_intf_attr(bAlternateSetting, "%2d\n");
|
|
usb_intf_attr(bNumEndpoints, "%02x\n");
|
|
usb_intf_attr(bInterfaceClass, "%02x\n");
|
|
usb_intf_attr(bInterfaceSubClass, "%02x\n");
|
|
usb_intf_attr(bInterfaceProtocol, "%02x\n");
|
|
|
|
static ssize_t interface_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct usb_interface *intf;
|
|
char *string;
|
|
|
|
intf = to_usb_interface(dev);
|
|
string = ACCESS_ONCE(intf->cur_altsetting->string);
|
|
if (!string)
|
|
return 0;
|
|
return sprintf(buf, "%s\n", string);
|
|
}
|
|
static DEVICE_ATTR_RO(interface);
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct usb_interface *intf;
|
|
struct usb_device *udev;
|
|
struct usb_host_interface *alt;
|
|
|
|
intf = to_usb_interface(dev);
|
|
udev = interface_to_usbdev(intf);
|
|
alt = ACCESS_ONCE(intf->cur_altsetting);
|
|
|
|
return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
|
|
"ic%02Xisc%02Xip%02Xin%02X\n",
|
|
le16_to_cpu(udev->descriptor.idVendor),
|
|
le16_to_cpu(udev->descriptor.idProduct),
|
|
le16_to_cpu(udev->descriptor.bcdDevice),
|
|
udev->descriptor.bDeviceClass,
|
|
udev->descriptor.bDeviceSubClass,
|
|
udev->descriptor.bDeviceProtocol,
|
|
alt->desc.bInterfaceClass,
|
|
alt->desc.bInterfaceSubClass,
|
|
alt->desc.bInterfaceProtocol,
|
|
alt->desc.bInterfaceNumber);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t supports_autosuspend_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int s;
|
|
|
|
s = device_lock_interruptible(dev);
|
|
if (s < 0)
|
|
return -EINTR;
|
|
/* Devices will be autosuspended even when an interface isn't claimed */
|
|
s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend);
|
|
device_unlock(dev);
|
|
|
|
return sprintf(buf, "%u\n", s);
|
|
}
|
|
static DEVICE_ATTR_RO(supports_autosuspend);
|
|
|
|
/*
|
|
* interface_authorized_show - show authorization status of an USB interface
|
|
* 1 is authorized, 0 is deauthorized
|
|
*/
|
|
static ssize_t interface_authorized_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
|
|
return sprintf(buf, "%u\n", intf->authorized);
|
|
}
|
|
|
|
/*
|
|
* interface_authorized_store - authorize or deauthorize an USB interface
|
|
*/
|
|
static ssize_t interface_authorized_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
bool val;
|
|
|
|
if (strtobool(buf, &val) != 0)
|
|
return -EINVAL;
|
|
|
|
if (val)
|
|
usb_authorize_interface(intf);
|
|
else
|
|
usb_deauthorize_interface(intf);
|
|
|
|
return count;
|
|
}
|
|
static struct device_attribute dev_attr_interface_authorized =
|
|
__ATTR(authorized, S_IRUGO | S_IWUSR,
|
|
interface_authorized_show, interface_authorized_store);
|
|
|
|
static struct attribute *intf_attrs[] = {
|
|
&dev_attr_bInterfaceNumber.attr,
|
|
&dev_attr_bAlternateSetting.attr,
|
|
&dev_attr_bNumEndpoints.attr,
|
|
&dev_attr_bInterfaceClass.attr,
|
|
&dev_attr_bInterfaceSubClass.attr,
|
|
&dev_attr_bInterfaceProtocol.attr,
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_supports_autosuspend.attr,
|
|
&dev_attr_interface_authorized.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group intf_attr_grp = {
|
|
.attrs = intf_attrs,
|
|
};
|
|
|
|
static struct attribute *intf_assoc_attrs[] = {
|
|
&dev_attr_iad_bFirstInterface.attr,
|
|
&dev_attr_iad_bInterfaceCount.attr,
|
|
&dev_attr_iad_bFunctionClass.attr,
|
|
&dev_attr_iad_bFunctionSubClass.attr,
|
|
&dev_attr_iad_bFunctionProtocol.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct usb_interface *intf = to_usb_interface(dev);
|
|
|
|
if (intf->intf_assoc == NULL)
|
|
return 0;
|
|
return a->mode;
|
|
}
|
|
|
|
static struct attribute_group intf_assoc_attr_grp = {
|
|
.attrs = intf_assoc_attrs,
|
|
.is_visible = intf_assoc_attrs_are_visible,
|
|
};
|
|
|
|
const struct attribute_group *usb_interface_groups[] = {
|
|
&intf_attr_grp,
|
|
&intf_assoc_attr_grp,
|
|
NULL
|
|
};
|
|
|
|
void usb_create_sysfs_intf_files(struct usb_interface *intf)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
struct usb_host_interface *alt = intf->cur_altsetting;
|
|
|
|
if (intf->sysfs_files_created || intf->unregistering)
|
|
return;
|
|
|
|
if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
|
|
alt->string = usb_cache_string(udev, alt->desc.iInterface);
|
|
if (alt->string && device_create_file(&intf->dev, &dev_attr_interface))
|
|
; /* We don't actually care if the function fails. */
|
|
intf->sysfs_files_created = 1;
|
|
}
|
|
|
|
void usb_remove_sysfs_intf_files(struct usb_interface *intf)
|
|
{
|
|
if (!intf->sysfs_files_created)
|
|
return;
|
|
|
|
device_remove_file(&intf->dev, &dev_attr_interface);
|
|
intf->sysfs_files_created = 0;
|
|
}
|