// SPDX-License-Identifier: GPL-2.0/* * drivers/usb/core/sysfs.c * * (C) Copyright 2002 David Brownell * (C) Copyright 2002,2004 Greg Kroah-Hartman * (C) Copyright 2002,2004 IBM Corp. * * All of the sysfs file attributes for usb devices and interfaces. * * Released under the GPLv2 only. */  #include <linux/kernel.h>#include <linux/kstrtox.h>#include <linux/string.h>#include <linux/usb.h>#include <linux/usb/hcd.h>#include <linux/usb/quirks.h>#include <linux/of.h>#include "usb.h" /* Active configuration fields */#define usb_actconfig_show(field, format_string)			\static ssize_t field##_show(struct device *dev,				\			    struct device_attribute *attr, char *buf)	\{									\	struct usb_device *udev;					\	struct usb_host_config *actconfig;				\	ssize_t rc;							\									\	udev = to_usb_device(dev);					\	rc = usb_lock_device_interruptible(udev);			\	if (rc < 0)							\		return -EINTR;						\	actconfig = udev->actconfig;					\	if (actconfig)							\		rc = sysfs_emit(buf, format_string,			\				actconfig->desc.field);			\	usb_unlock_device(udev);					\	return rc;							\}									\ #define usb_actconfig_attr(field, format_string)		\	usb_actconfig_show(field, format_string)		\	static DEVICE_ATTR_RO(field) usb_actconfig_attr(bNumInterfaces, "%2d\n");usb_actconfig_attr(bmAttributes, "%2x\n"); static ssize_t bMaxPower_show(struct device *dev,		struct device_attribute *attr, char *buf){	struct usb_device *udev;	struct usb_host_config *actconfig;	ssize_t rc; 	udev = to_usb_device(dev);	rc = usb_lock_device_interruptible(udev);	if (rc < 0)		return -EINTR;	actconfig = udev->actconfig;	if (actconfig)		rc = sysfs_emit(buf, "%dmA\n", usb_get_max_power(udev, actconfig));	usb_unlock_device(udev);	return rc;}static DEVICE_ATTR_RO(bMaxPower); static ssize_t configuration_show(struct device *dev,		struct device_attribute *attr, char *buf){	struct usb_device *udev;	struct usb_host_config *actconfig;	ssize_t rc; 	udev = to_usb_device(dev);	rc = usb_lock_device_interruptible(udev);	if (rc < 0)		return -EINTR;	actconfig = udev->actconfig;	if (actconfig && actconfig->string)		rc = sysfs_emit(buf, "%s\n", actconfig->string);	usb_unlock_device(udev);	return rc;}static DEVICE_ATTR_RO(configuration); /* configuration value is always present, and r/w */usb_actconfig_show(bConfigurationValue, "%u\n"); static ssize_t bConfigurationValue_store(struct device *dev,					 struct device_attribute *attr,					 const char *buf, size_t count){	struct usb_device	*udev = to_usb_device(dev);	int			config, value, rc; 	if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)		return -EINVAL;	rc = usb_lock_device_interruptible(udev);	if (rc < 0)		return -EINTR;	value = usb_set_configuration(udev, config);	usb_unlock_device(udev);	return (value < 0) ? value : count;}static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,		bConfigurationValue_show, bConfigurationValue_store); #ifdef CONFIG_OFstatic ssize_t devspec_show(struct device *dev, struct device_attribute *attr,			    char *buf){	struct device_node *of_node = dev->of_node; 	return sysfs_emit(buf, "%pOF\n", of_node);}static DEVICE_ATTR_RO(devspec);#endif /* String fields */#define usb_string_attr(name)						\static ssize_t  name##_show(struct device *dev,				\		struct device_attribute *attr, char *buf)		\{									\	struct usb_device *udev;					\	int retval;							\									\	udev = to_usb_device(dev);					\	retval = usb_lock_device_interruptible(udev);			\	if (retval < 0)							\		return -EINTR;						\	retval = sysfs_emit(buf, "%s\n", udev->name);			\	usb_unlock_device(udev);					\	return retval;							\}									\static DEVICE_ATTR_RO(name) usb_string_attr(product);usb_string_attr(manufacturer);usb_string_attr(serial); static ssize_t speed_show(struct device *dev, struct device_attribute *attr,			  char *buf){	struct usb_device *udev;	char *speed; 	udev = to_usb_device(dev); 	switch (udev->speed) {	case USB_SPEED_LOW:		speed = "1.5";		break;	case USB_SPEED_UNKNOWN:	case USB_SPEED_FULL:		speed = "12";		break;	case USB_SPEED_HIGH:		speed = "480";		break;	case USB_SPEED_SUPER:		speed = "5000";		break;	case USB_SPEED_SUPER_PLUS:		if (udev->ssp_rate == USB_SSP_GEN_2x2)			speed = "20000";		else			speed = "10000";		break;	default:		speed = "unknown";	}	return sysfs_emit(buf, "%s\n", speed);}static DEVICE_ATTR_RO(speed); static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,			  char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", udev->rx_lanes);}static DEVICE_ATTR_RO(rx_lanes); static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,			  char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", udev->tx_lanes);}static DEVICE_ATTR_RO(tx_lanes); static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,			   char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", udev->bus->busnum);}static DEVICE_ATTR_RO(busnum); static ssize_t devnum_show(struct device *dev, struct device_attribute *attr,			   char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", udev->devnum);}static DEVICE_ATTR_RO(devnum); static ssize_t devpath_show(struct device *dev, struct device_attribute *attr,			    char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%s\n", udev->devpath);}static DEVICE_ATTR_RO(devpath); static ssize_t version_show(struct device *dev, struct device_attribute *attr,			    char *buf){	struct usb_device *udev;	u16 bcdUSB; 	udev = to_usb_device(dev);	bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB);	return sysfs_emit(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff);}static DEVICE_ATTR_RO(version); static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr,			     char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", udev->maxchild);}static DEVICE_ATTR_RO(maxchild); static ssize_t quirks_show(struct device *dev, struct device_attribute *attr,			   char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "0x%x\n", udev->quirks);}static DEVICE_ATTR_RO(quirks); static ssize_t avoid_reset_quirk_show(struct device *dev,				      struct device_attribute *attr, char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET));} static ssize_t avoid_reset_quirk_store(struct device *dev,				      struct device_attribute *attr,				      const char *buf, size_t count){	struct usb_device	*udev = to_usb_device(dev);	bool			val;	int			rc; 	if (kstrtobool(buf, &val) != 0)		return -EINVAL;	rc = usb_lock_device_interruptible(udev);	if (rc < 0)		return -EINTR;	if (val)		udev->quirks |= USB_QUIRK_RESET;	else		udev->quirks &= ~USB_QUIRK_RESET;	usb_unlock_device(udev);	return count;}static DEVICE_ATTR_RW(avoid_reset_quirk); static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr,			   char *buf){	struct usb_device *udev; 	udev = to_usb_device(dev);	return sysfs_emit(buf, "%d\n", atomic_read(&udev->urbnum));}static DEVICE_ATTR_RO(urbnum); static ssize_t ltm_capable_show(struct device *dev,				struct device_attribute *attr, char *buf){	if (usb_device_supports_ltm(to_usb_device(dev)))		return sysfs_emit(buf, "%s\n", "yes");	return sysfs_emit(buf, "%s\n", "no");}static DEVICE_ATTR_RO(ltm_capable); #ifdef	CONFIG_PM static ssize_t persist_show(struct device *dev, struct device_attribute *attr,			    char *buf){	struct usb_device *udev = to_usb_device(dev); 	return sysfs_emit(buf, "%d\n", udev->persist_enabled);} static ssize_t persist_store(struct device *dev, struct device_attribute *attr,			     const char *buf, size_t count){	struct usb_device *udev = to_usb_device(dev);	bool value;	int rc; 	/* Hubs are always enabled for USB_PERSIST */	if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)		return -EPERM; 	if (kstrtobool(buf, &value) != 0)		return -EINVAL; 	rc = usb_lock_device_interruptible(udev);	if (rc < 0)		return -EINTR;	udev->persist_enabled = !!value;	usb_unlock_device(udev);	return count;}static DEVICE_ATTR_RW(persist); static int add_persist_attributes(struct device *dev){	int rc = 0; 	if (is_usb_device(dev)) {		struct usb_device *udev = to_usb_device(dev); 		/* Hubs are automatically enabled for USB_PERSIST,		 * no point in creating the attribute file.		 */		if (udev->descriptor.bDeviceClass != USB_CLASS_HUB)			rc = sysfs_add_file_to_group(&dev->kobj,					&dev_attr_persist.attr,					power_group_name);	}	return rc;} static void remove_persist_attributes(struct device *dev){	sysfs_remove_file_from_group(&dev->kobj,			&dev_attr_persist.attr,			power_group_name);} static ssize_t connected_duration_show(struct device *dev,				       struct device_attribute *attr, char *buf){	struct usb_device *udev = to_usb_device(dev); 	return sysfs_emit(buf, "%u\n",			jiffies_to_msecs(jiffies - udev->connect_time));}static DEVICE_ATTR_RO(connected_duration); /* * If the device is resumed, the last time the device was suspended has * been pre-subtracted from active_duration.  We add the current time to * get the duration that the device was actually active. * * If the device is suspended, the active_duration is up-to-date. */static ssize_t active_duration_show(struct device *dev,				    struct device_attribute *attr, char *buf){	struct usb_device *udev = to_usb_device(dev);	int duration; 	if (udev->state != USB_STATE_SUSPENDED)		duration = jiffies_to_msecs(jiffies + udev->active_duration);	else		duration = jiffies_to_msecs(udev->active_duration);	return sysfs_emit(buf, "%u\n", duration);}static DEVICE_ATTR_RO(active_duration); static ssize_t autosuspend_show(struct device *dev,				struct device_attribute *attr, char *buf){	return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay / 1000);} static ssize_t autosuspend_store(struct device *dev,				 struct device_attribute *attr, const char *buf,				 size_t count){	int value; 	if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 ||			value <= -INT_MAX/1000)		return -EINVAL; 	pm_runtime_set_autosuspend_delay(dev, value * 1000);	return count;}static DEVICE_ATTR_RW(autosuspend); static const char on_string[] = "on";static const char auto_string[] = "auto"; static void warn_level(void){	static int level_warned; 	if (!level_warned) {		level_warned = 1;		printk(KERN_WARNING "WARNING! power/level is deprecated; "				"use power/control instead\n");	}} static ssize_t level_show(struct device *dev, struct device_attribute *attr,			  char *buf){	struct usb_device *udev = to_usb_device(dev);	const char *p = auto_string; 	warn_level();	if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto)		p = on_string;	return sysfs_emit(buf, "%s\n", p);} static ssize_t level_store(struct device *dev, struct device_attribute *attr,			   const char *buf, size_t count){	struct usb_device *udev = to_usb_device(dev);	int len = count;	char *cp;	int rc = count;	int rv; 	warn_level();	cp = memchr(buf, '\n', count);	if (cp)		len = cp - buf; 	rv = usb_lock_device_interruptible(udev);	if (rv < 0)		return -EINTR; 	if (len == sizeof on_string - 1 &&			strncmp(buf, on_string, len) == 0)		usb_disable_autosuspend(udev); 	else if (len == sizeof auto_string - 1 &&			strncmp(buf, auto_string, len) == 0)		usb_enable_autosuspend(udev); 	else		rc = -EINVAL; 	usb_unlock_device(udev);	return rc;}static DEVICE_ATTR_RW(level); static ssize_t usb2_hardware_lpm_show(struct device *dev,				      struct device_attribute *attr, char *buf){	struct usb_device *udev = to_usb_device(dev);	const char *p; 	if (udev->usb2_hw_lpm_allowed == 1)		p = "enabled";	else		p = "disabled"; 	return sysfs_emit(buf, "%s\n", p);} static ssize_t usb2_hardware_lpm_store(struct device *dev,				       struct device_attribute *attr,				       const char *buf, size_t count){	struct usb_device *udev = to_usb_device(dev);

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