diff options
Diffstat (limited to 'drivers/usb/core/sysfs.c')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index 7e88fdfe3cf5..f19694e69f5c 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -15,6 +15,7 @@ #include <linux/kernel.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" @@ -922,6 +923,116 @@ static struct bin_attribute dev_bin_attr_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; @@ -938,7 +1049,14 @@ int usb_create_sysfs_dev_files(struct usb_device *udev) 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; @@ -948,6 +1066,9 @@ 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); |