mirror of https://gitee.com/openkylin/linux.git
711 lines
18 KiB
C
711 lines
18 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 "usb.h"
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/* Active configuration fields */
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#define usb_actconfig_show(field, multiplier, format_string) \
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static ssize_t show_##field(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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\
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udev = to_usb_device(dev); \
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actconfig = udev->actconfig; \
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if (actconfig) \
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return sprintf(buf, format_string, \
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actconfig->desc.field * multiplier); \
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else \
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return 0; \
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} \
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#define usb_actconfig_attr(field, multiplier, format_string) \
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usb_actconfig_show(field, multiplier, format_string) \
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static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
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usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
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usb_actconfig_attr(bmAttributes, 1, "%2x\n")
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usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")
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static ssize_t show_configuration_string(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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udev = to_usb_device(dev);
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actconfig = udev->actconfig;
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if ((!actconfig) || (!actconfig->string))
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return 0;
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return sprintf(buf, "%s\n", actconfig->string);
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}
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static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
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/* configuration value is always present, and r/w */
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usb_actconfig_show(bConfigurationValue, 1, "%u\n");
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static ssize_t
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set_bConfigurationValue(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 config, value;
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if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
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return -EINVAL;
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usb_lock_device(udev);
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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(bConfigurationValue, S_IRUGO | S_IWUSR,
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show_bConfigurationValue, set_bConfigurationValue);
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/* String fields */
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#define usb_string_attr(name) \
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static ssize_t show_##name(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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\
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udev = to_usb_device(dev); \
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return sprintf(buf, "%s\n", udev->name); \
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} \
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static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
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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
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show_speed(struct device *dev, struct device_attribute *attr, 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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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(speed, S_IRUGO, show_speed, NULL);
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static ssize_t
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show_busnum(struct device *dev, 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->bus->busnum);
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}
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static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
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static ssize_t
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show_devnum(struct device *dev, 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->devnum);
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}
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static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL);
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static ssize_t
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show_version(struct device *dev, struct device_attribute *attr, 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(version, S_IRUGO, show_version, NULL);
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static ssize_t
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show_maxchild(struct device *dev, 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->maxchild);
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}
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static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL);
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static ssize_t
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show_quirks(struct device *dev, 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, "0x%x\n", udev->quirks);
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}
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static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL);
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#if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND)
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static const char power_group[] = "power";
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#endif
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#ifdef CONFIG_USB_PERSIST
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static ssize_t
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show_persist(struct device *dev, 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, "%d\n", udev->persist_enabled);
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}
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static ssize_t
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set_persist(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;
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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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usb_pm_lock(udev);
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udev->persist_enabled = !!value;
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usb_pm_unlock(udev);
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return count;
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}
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static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_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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if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
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udev->persist_enabled = 1;
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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);
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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);
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}
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#else
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#define add_persist_attributes(dev) 0
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#define remove_persist_attributes(dev) do {} while (0)
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#endif /* CONFIG_USB_PERSIST */
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#ifdef CONFIG_USB_SUSPEND
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static ssize_t
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show_autosuspend(struct device *dev, 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, "%d\n", udev->autosuspend_delay / HZ);
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}
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static ssize_t
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set_autosuspend(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;
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if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ ||
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value <= - INT_MAX/HZ)
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return -EINVAL;
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value *= HZ;
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udev->autosuspend_delay = value;
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if (value >= 0)
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usb_try_autosuspend_device(udev);
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else {
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if (usb_autoresume_device(udev) == 0)
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usb_autosuspend_device(udev);
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}
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return count;
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}
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static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
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show_autosuspend, set_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 const char suspend_string[] = "suspend";
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static ssize_t
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show_level(struct device *dev, 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 = auto_string;
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if (udev->state == USB_STATE_SUSPENDED) {
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if (udev->autoresume_disabled)
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p = suspend_string;
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} else {
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if (udev->autosuspend_disabled)
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p = on_string;
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}
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return sprintf(buf, "%s\n", p);
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}
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static ssize_t
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set_level(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 = 0;
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int old_autosuspend_disabled, old_autoresume_disabled;
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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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usb_lock_device(udev);
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old_autosuspend_disabled = udev->autosuspend_disabled;
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old_autoresume_disabled = udev->autoresume_disabled;
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/* Setting the flags without calling usb_pm_lock is a subject to
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* races, but who cares...
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*/
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if (len == sizeof on_string - 1 &&
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strncmp(buf, on_string, len) == 0) {
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udev->autosuspend_disabled = 1;
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udev->autoresume_disabled = 0;
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rc = usb_external_resume_device(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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udev->autosuspend_disabled = 0;
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udev->autoresume_disabled = 0;
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rc = usb_external_resume_device(udev);
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} else if (len == sizeof suspend_string - 1 &&
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strncmp(buf, suspend_string, len) == 0) {
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udev->autosuspend_disabled = 0;
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udev->autoresume_disabled = 1;
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rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
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} else
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rc = -EINVAL;
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if (rc) {
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udev->autosuspend_disabled = old_autosuspend_disabled;
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udev->autoresume_disabled = old_autoresume_disabled;
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}
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usb_unlock_device(udev);
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return (rc < 0 ? rc : count);
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}
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static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
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static int add_power_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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rc = sysfs_add_file_to_group(&dev->kobj,
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&dev_attr_autosuspend.attr,
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power_group);
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if (rc == 0)
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rc = sysfs_add_file_to_group(&dev->kobj,
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&dev_attr_level.attr,
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power_group);
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}
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return rc;
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}
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static void remove_power_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_level.attr,
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power_group);
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sysfs_remove_file_from_group(&dev->kobj,
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&dev_attr_autosuspend.attr,
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power_group);
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}
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#else
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#define add_power_attributes(dev) 0
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#define remove_power_attributes(dev) do {} while (0)
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#endif /* CONFIG_USB_SUSPEND */
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/* Descriptor fields */
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#define usb_descriptor_attr_le16(field, format_string) \
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static ssize_t \
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show_##field(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, format_string, \
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le16_to_cpu(udev->descriptor.field)); \
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} \
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static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
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usb_descriptor_attr_le16(idVendor, "%04x\n")
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usb_descriptor_attr_le16(idProduct, "%04x\n")
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usb_descriptor_attr_le16(bcdDevice, "%04x\n")
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#define usb_descriptor_attr(field, format_string) \
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static ssize_t \
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show_##field(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, format_string, udev->descriptor.field); \
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} \
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static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
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usb_descriptor_attr(bDeviceClass, "%02x\n")
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usb_descriptor_attr(bDeviceSubClass, "%02x\n")
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usb_descriptor_attr(bDeviceProtocol, "%02x\n")
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usb_descriptor_attr(bNumConfigurations, "%d\n")
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usb_descriptor_attr(bMaxPacketSize0, "%d\n")
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static struct attribute *dev_attrs[] = {
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/* current configuration's attributes */
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&dev_attr_configuration.attr,
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&dev_attr_bNumInterfaces.attr,
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&dev_attr_bConfigurationValue.attr,
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&dev_attr_bmAttributes.attr,
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&dev_attr_bMaxPower.attr,
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/* device attributes */
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&dev_attr_idVendor.attr,
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&dev_attr_idProduct.attr,
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&dev_attr_bcdDevice.attr,
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&dev_attr_bDeviceClass.attr,
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&dev_attr_bDeviceSubClass.attr,
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&dev_attr_bDeviceProtocol.attr,
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&dev_attr_bNumConfigurations.attr,
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&dev_attr_bMaxPacketSize0.attr,
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&dev_attr_speed.attr,
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&dev_attr_busnum.attr,
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&dev_attr_devnum.attr,
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&dev_attr_version.attr,
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&dev_attr_maxchild.attr,
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&dev_attr_quirks.attr,
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NULL,
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};
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static struct attribute_group dev_attr_grp = {
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.attrs = dev_attrs,
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};
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/* Binary descriptors */
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static ssize_t
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read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
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char *buf, loff_t off, size_t count)
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{
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struct usb_device *udev = to_usb_device(
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container_of(kobj, struct device, kobj));
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size_t nleft = count;
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size_t srclen, n;
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usb_lock_device(udev);
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/* The binary attribute begins with the device descriptor */
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srclen = sizeof(struct usb_device_descriptor);
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if (off < srclen) {
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n = min_t(size_t, nleft, srclen - off);
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memcpy(buf, off + (char *) &udev->descriptor, n);
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nleft -= n;
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buf += n;
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off = 0;
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} else {
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off -= srclen;
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}
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/* Then follows the raw descriptor entry for the current
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* configuration (config plus subsidiary descriptors).
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*/
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if (udev->actconfig) {
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int cfgno = udev->actconfig - udev->config;
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srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength);
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if (off < srclen) {
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n = min_t(size_t, nleft, srclen - off);
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memcpy(buf, off + udev->rawdescriptors[cfgno], n);
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nleft -= n;
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}
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}
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usb_unlock_device(udev);
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return count - nleft;
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}
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static struct bin_attribute dev_bin_attr_descriptors = {
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.attr = {.name = "descriptors", .mode = 0444},
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.read = read_descriptors,
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.size = 18 + 65535, /* dev descr + max-size raw descriptor */
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};
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int usb_create_sysfs_dev_files(struct usb_device *udev)
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{
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struct device *dev = &udev->dev;
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int retval;
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retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
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if (retval)
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return retval;
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retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
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if (retval)
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goto error;
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retval = add_persist_attributes(dev);
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if (retval)
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goto error;
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retval = add_power_attributes(dev);
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if (retval)
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goto error;
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if (udev->manufacturer) {
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|
retval = device_create_file(dev, &dev_attr_manufacturer);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
if (udev->product) {
|
|
retval = device_create_file(dev, &dev_attr_product);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
if (udev->serial) {
|
|
retval = device_create_file(dev, &dev_attr_serial);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
retval = usb_create_ep_files(dev, &udev->ep0, udev);
|
|
if (retval)
|
|
goto error;
|
|
return 0;
|
|
error:
|
|
usb_remove_sysfs_dev_files(udev);
|
|
return retval;
|
|
}
|
|
|
|
void usb_remove_sysfs_dev_files(struct usb_device *udev)
|
|
{
|
|
struct device *dev = &udev->dev;
|
|
|
|
usb_remove_ep_files(&udev->ep0);
|
|
device_remove_file(dev, &dev_attr_manufacturer);
|
|
device_remove_file(dev, &dev_attr_product);
|
|
device_remove_file(dev, &dev_attr_serial);
|
|
remove_power_attributes(dev);
|
|
remove_persist_attributes(dev);
|
|
device_remove_bin_file(dev, &dev_bin_attr_descriptors);
|
|
sysfs_remove_group(&dev->kobj, &dev_attr_grp);
|
|
}
|
|
|
|
/* Interface Accociation Descriptor fields */
|
|
#define usb_intf_assoc_attr(field, format_string) \
|
|
static ssize_t \
|
|
show_iad_##field (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(iad_##field, S_IRUGO, show_iad_##field, NULL);
|
|
|
|
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 \
|
|
show_##field(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(field, S_IRUGO, show_##field, NULL);
|
|
|
|
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 show_interface_string(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_interface *intf;
|
|
struct usb_device *udev;
|
|
int len;
|
|
|
|
intf = to_usb_interface(dev);
|
|
udev = interface_to_usbdev(intf);
|
|
len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
|
|
if (len < 0)
|
|
return 0;
|
|
buf[len] = '\n';
|
|
buf[len+1] = 0;
|
|
return len+1;
|
|
}
|
|
static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
|
|
|
|
static ssize_t show_modalias(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 = intf->cur_altsetting;
|
|
|
|
return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
|
|
"ic%02Xisc%02Xip%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);
|
|
}
|
|
static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
|
|
|
|
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 struct attribute_group intf_assoc_attr_grp = {
|
|
.attrs = intf_assoc_attrs,
|
|
};
|
|
|
|
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,
|
|
NULL,
|
|
};
|
|
static struct attribute_group intf_attr_grp = {
|
|
.attrs = intf_attrs,
|
|
};
|
|
|
|
static inline void usb_create_intf_ep_files(struct usb_interface *intf,
|
|
struct usb_device *udev)
|
|
{
|
|
struct usb_host_interface *iface_desc;
|
|
int i;
|
|
|
|
iface_desc = intf->cur_altsetting;
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
|
|
usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
|
|
udev);
|
|
}
|
|
|
|
static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
|
|
{
|
|
struct usb_host_interface *iface_desc;
|
|
int i;
|
|
|
|
iface_desc = intf->cur_altsetting;
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
|
|
usb_remove_ep_files(&iface_desc->endpoint[i]);
|
|
}
|
|
|
|
int usb_create_sysfs_intf_files(struct usb_interface *intf)
|
|
{
|
|
struct device *dev = &intf->dev;
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
struct usb_host_interface *alt = intf->cur_altsetting;
|
|
int retval;
|
|
|
|
retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (alt->string == NULL)
|
|
alt->string = usb_cache_string(udev, alt->desc.iInterface);
|
|
if (alt->string)
|
|
retval = device_create_file(dev, &dev_attr_interface);
|
|
if (intf->intf_assoc)
|
|
retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp);
|
|
usb_create_intf_ep_files(intf, udev);
|
|
return 0;
|
|
}
|
|
|
|
void usb_remove_sysfs_intf_files(struct usb_interface *intf)
|
|
{
|
|
struct device *dev = &intf->dev;
|
|
|
|
usb_remove_intf_ep_files(intf);
|
|
device_remove_file(dev, &dev_attr_interface);
|
|
sysfs_remove_group(&dev->kobj, &intf_attr_grp);
|
|
sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp);
|
|
}
|