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1284 lines
32 KiB
1284 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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* Released under the GPLv2 only. |
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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/hcd.h> |
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#include <linux/usb/quirks.h> |
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#include <linux/of.h> |
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#include "usb.h" |
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|
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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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|
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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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|
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usb_actconfig_attr(bNumInterfaces, "%2d\n"); |
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usb_actconfig_attr(bmAttributes, "%2x\n"); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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#ifdef CONFIG_OF |
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static ssize_t devspec_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct device_node *of_node = dev->of_node; |
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|
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return sprintf(buf, "%pOF\n", of_node); |
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} |
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static DEVICE_ATTR_RO(devspec); |
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#endif |
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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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|
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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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|
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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 rx_lanes_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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|
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udev = to_usb_device(dev); |
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return sprintf(buf, "%d\n", udev->rx_lanes); |
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} |
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static DEVICE_ATTR_RO(rx_lanes); |
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static ssize_t tx_lanes_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->tx_lanes); |
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} |
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static DEVICE_ATTR_RO(tx_lanes); |
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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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|
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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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/* |
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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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|
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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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|
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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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|
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static const char on_string[] = "on"; |
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static const char auto_string[] = "auto"; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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else |
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rc = -EINVAL; |
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|
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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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|
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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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|
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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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ret = usb_lock_device_interruptible(udev); |
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if (ret < 0) |
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return -EINTR; |
|
|
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ret = strtobool(buf, &value); |
|
|
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if (!ret) { |
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udev->usb2_hw_lpm_allowed = value; |
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if (value) |
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ret = usb_enable_usb2_hardware_lpm(udev); |
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else |
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ret = usb_disable_usb2_hardware_lpm(udev); |
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} |
|
|
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usb_unlock_device(udev); |
|
|
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if (!ret) |
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return count; |
|
|
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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, |
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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->l1_params.timeout); |
|
} |
|
|
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static ssize_t usb2_lpm_l1_timeout_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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u16 timeout; |
|
|
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if (kstrtou16(buf, 0, &timeout)) |
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return -EINVAL; |
|
|
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udev->l1_params.timeout = timeout; |
|
|
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return count; |
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} |
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static DEVICE_ATTR_RW(usb2_lpm_l1_timeout); |
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|
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static ssize_t usb2_lpm_besl_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
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struct usb_device *udev = to_usb_device(dev); |
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return sprintf(buf, "%d\n", udev->l1_params.besl); |
|
} |
|
|
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static ssize_t usb2_lpm_besl_store(struct device *dev, |
|
struct device_attribute *attr, |
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const char *buf, size_t count) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
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u8 besl; |
|
|
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if (kstrtou8(buf, 0, &besl) || besl > 15) |
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return -EINVAL; |
|
|
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udev->l1_params.besl = besl; |
|
|
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return count; |
|
} |
|
static DEVICE_ATTR_RW(usb2_lpm_besl); |
|
|
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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 const 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 const 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 const 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->speed == USB_SPEED_SUPER_PLUS) && |
|
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_rx_lanes.attr, |
|
&dev_attr_tx_lanes.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, |
|
#ifdef CONFIG_OF |
|
&dev_attr_devspec.attr, |
|
#endif |
|
NULL, |
|
}; |
|
static const 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 = kobj_to_dev(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 const 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 = kobj_to_dev(kobj); |
|
struct usb_device *udev = to_usb_device(dev); |
|
size_t nleft = count; |
|
size_t srclen, n; |
|
int cfgno; |
|
void *src; |
|
int retval; |
|
|
|
retval = usb_lock_device_interruptible(udev); |
|
if (retval < 0) |
|
return -EINTR; |
|
/* 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; |
|
} |
|
} |
|
usb_unlock_device(udev); |
|
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 */ |
|
}; |
|
|
|
/* |
|
* Show & store the current value of authorized_default |
|
*/ |
|
static ssize_t authorized_default_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct usb_device *rh_usb_dev = to_usb_device(dev); |
|
struct usb_bus *usb_bus = rh_usb_dev->bus; |
|
struct usb_hcd *hcd; |
|
|
|
hcd = bus_to_hcd(usb_bus); |
|
return snprintf(buf, PAGE_SIZE, "%u\n", hcd->dev_policy); |
|
} |
|
|
|
static ssize_t authorized_default_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t size) |
|
{ |
|
ssize_t result; |
|
unsigned int val; |
|
struct usb_device *rh_usb_dev = to_usb_device(dev); |
|
struct usb_bus *usb_bus = rh_usb_dev->bus; |
|
struct usb_hcd *hcd; |
|
|
|
hcd = bus_to_hcd(usb_bus); |
|
result = sscanf(buf, "%u\n", &val); |
|
if (result == 1) { |
|
hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ? |
|
val : USB_DEVICE_AUTHORIZE_ALL; |
|
result = size; |
|
} else { |
|
result = -EINVAL; |
|
} |
|
return result; |
|
} |
|
static DEVICE_ATTR_RW(authorized_default); |
|
|
|
/* |
|
* interface_authorized_default_show - show default authorization status |
|
* for USB interfaces |
|
* |
|
* note: interface_authorized_default is the default value |
|
* for initializing the authorized attribute of interfaces |
|
*/ |
|
static ssize_t interface_authorized_default_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct usb_device *usb_dev = to_usb_device(dev); |
|
struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus); |
|
|
|
return sprintf(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd)); |
|
} |
|
|
|
/* |
|
* interface_authorized_default_store - store default authorization status |
|
* for USB interfaces |
|
* |
|
* note: interface_authorized_default is the default value |
|
* for initializing the authorized attribute of interfaces |
|
*/ |
|
static ssize_t interface_authorized_default_store(struct device *dev, |
|
struct device_attribute *attr, const char *buf, size_t count) |
|
{ |
|
struct usb_device *usb_dev = to_usb_device(dev); |
|
struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus); |
|
int rc = count; |
|
bool val; |
|
|
|
if (strtobool(buf, &val) != 0) |
|
return -EINVAL; |
|
|
|
if (val) |
|
set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags); |
|
else |
|
clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags); |
|
|
|
return rc; |
|
} |
|
static DEVICE_ATTR_RW(interface_authorized_default); |
|
|
|
/* Group all the USB bus attributes */ |
|
static struct attribute *usb_bus_attrs[] = { |
|
&dev_attr_authorized_default.attr, |
|
&dev_attr_interface_authorized_default.attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group usb_bus_attr_group = { |
|
.name = NULL, /* we want them in the same directory */ |
|
.attrs = usb_bus_attrs, |
|
}; |
|
|
|
|
|
static int add_default_authorized_attributes(struct device *dev) |
|
{ |
|
int rc = 0; |
|
|
|
if (is_usb_device(dev)) |
|
rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group); |
|
|
|
return rc; |
|
} |
|
|
|
static void remove_default_authorized_attributes(struct device *dev) |
|
{ |
|
if (is_usb_device(dev)) { |
|
sysfs_remove_group(&dev->kobj, &usb_bus_attr_group); |
|
} |
|
} |
|
|
|
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; |
|
|
|
if (is_root_hub(udev)) { |
|
retval = add_default_authorized_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; |
|
|
|
if (is_root_hub(udev)) |
|
remove_default_authorized_attributes(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 = READ_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 = READ_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 const 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 = kobj_to_dev(kobj); |
|
struct usb_interface *intf = to_usb_interface(dev); |
|
|
|
if (intf->intf_assoc == NULL) |
|
return 0; |
|
return a->mode; |
|
} |
|
|
|
static const 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)) { |
|
/* This is not a serious error */ |
|
dev_dbg(&intf->dev, "interface string descriptor file not created\n"); |
|
} |
|
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; |
|
}
|
|
|