diff options
Diffstat (limited to 'kernel/include/linux/usb.h')
| -rw-r--r-- | kernel/include/linux/usb.h | 1900 |
1 files changed, 1900 insertions, 0 deletions
diff --git a/kernel/include/linux/usb.h b/kernel/include/linux/usb.h new file mode 100644 index 000000000..447fe29b5 --- /dev/null +++ b/kernel/include/linux/usb.h @@ -0,0 +1,1900 @@ +#ifndef __LINUX_USB_H +#define __LINUX_USB_H + +#include <linux/mod_devicetable.h> +#include <linux/usb/ch9.h> + +#define USB_MAJOR 180 +#define USB_DEVICE_MAJOR 189 + + +#ifdef __KERNEL__ + +#include <linux/errno.h> /* for -ENODEV */ +#include <linux/delay.h> /* for mdelay() */ +#include <linux/interrupt.h> /* for in_interrupt() */ +#include <linux/list.h> /* for struct list_head */ +#include <linux/kref.h> /* for struct kref */ +#include <linux/device.h> /* for struct device */ +#include <linux/fs.h> /* for struct file_operations */ +#include <linux/completion.h> /* for struct completion */ +#include <linux/sched.h> /* for current && schedule_timeout */ +#include <linux/mutex.h> /* for struct mutex */ +#include <linux/pm_runtime.h> /* for runtime PM */ + +struct usb_device; +struct usb_driver; +struct wusb_dev; + +/*-------------------------------------------------------------------------*/ + +/* + * Host-side wrappers for standard USB descriptors ... these are parsed + * from the data provided by devices. Parsing turns them from a flat + * sequence of descriptors into a hierarchy: + * + * - devices have one (usually) or more configs; + * - configs have one (often) or more interfaces; + * - interfaces have one (usually) or more settings; + * - each interface setting has zero or (usually) more endpoints. + * - a SuperSpeed endpoint has a companion descriptor + * + * And there might be other descriptors mixed in with those. + * + * Devices may also have class-specific or vendor-specific descriptors. + */ + +struct ep_device; + +/** + * struct usb_host_endpoint - host-side endpoint descriptor and queue + * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder + * @ss_ep_comp: SuperSpeed companion descriptor for this endpoint + * @urb_list: urbs queued to this endpoint; maintained by usbcore + * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH) + * with one or more transfer descriptors (TDs) per urb + * @ep_dev: ep_device for sysfs info + * @extra: descriptors following this endpoint in the configuration + * @extralen: how many bytes of "extra" are valid + * @enabled: URBs may be submitted to this endpoint + * @streams: number of USB-3 streams allocated on the endpoint + * + * USB requests are always queued to a given endpoint, identified by a + * descriptor within an active interface in a given USB configuration. + */ +struct usb_host_endpoint { + struct usb_endpoint_descriptor desc; + struct usb_ss_ep_comp_descriptor ss_ep_comp; + struct list_head urb_list; + void *hcpriv; + struct ep_device *ep_dev; /* For sysfs info */ + + unsigned char *extra; /* Extra descriptors */ + int extralen; + int enabled; + int streams; +}; + +/* host-side wrapper for one interface setting's parsed descriptors */ +struct usb_host_interface { + struct usb_interface_descriptor desc; + + int extralen; + unsigned char *extra; /* Extra descriptors */ + + /* array of desc.bNumEndpoints endpoints associated with this + * interface setting. these will be in no particular order. + */ + struct usb_host_endpoint *endpoint; + + char *string; /* iInterface string, if present */ +}; + +enum usb_interface_condition { + USB_INTERFACE_UNBOUND = 0, + USB_INTERFACE_BINDING, + USB_INTERFACE_BOUND, + USB_INTERFACE_UNBINDING, +}; + +/** + * struct usb_interface - what usb device drivers talk to + * @altsetting: array of interface structures, one for each alternate + * setting that may be selected. Each one includes a set of + * endpoint configurations. They will be in no particular order. + * @cur_altsetting: the current altsetting. + * @num_altsetting: number of altsettings defined. + * @intf_assoc: interface association descriptor + * @minor: the minor number assigned to this interface, if this + * interface is bound to a driver that uses the USB major number. + * If this interface does not use the USB major, this field should + * be unused. The driver should set this value in the probe() + * function of the driver, after it has been assigned a minor + * number from the USB core by calling usb_register_dev(). + * @condition: binding state of the interface: not bound, binding + * (in probe()), bound to a driver, or unbinding (in disconnect()) + * @sysfs_files_created: sysfs attributes exist + * @ep_devs_created: endpoint child pseudo-devices exist + * @unregistering: flag set when the interface is being unregistered + * @needs_remote_wakeup: flag set when the driver requires remote-wakeup + * capability during autosuspend. + * @needs_altsetting0: flag set when a set-interface request for altsetting 0 + * has been deferred. + * @needs_binding: flag set when the driver should be re-probed or unbound + * following a reset or suspend operation it doesn't support. + * @dev: driver model's view of this device + * @usb_dev: if an interface is bound to the USB major, this will point + * to the sysfs representation for that device. + * @pm_usage_cnt: PM usage counter for this interface + * @reset_ws: Used for scheduling resets from atomic context. + * @resetting_device: USB core reset the device, so use alt setting 0 as + * current; needs bandwidth alloc after reset. + * + * USB device drivers attach to interfaces on a physical device. Each + * interface encapsulates a single high level function, such as feeding + * an audio stream to a speaker or reporting a change in a volume control. + * Many USB devices only have one interface. The protocol used to talk to + * an interface's endpoints can be defined in a usb "class" specification, + * or by a product's vendor. The (default) control endpoint is part of + * every interface, but is never listed among the interface's descriptors. + * + * The driver that is bound to the interface can use standard driver model + * calls such as dev_get_drvdata() on the dev member of this structure. + * + * Each interface may have alternate settings. The initial configuration + * of a device sets altsetting 0, but the device driver can change + * that setting using usb_set_interface(). Alternate settings are often + * used to control the use of periodic endpoints, such as by having + * different endpoints use different amounts of reserved USB bandwidth. + * All standards-conformant USB devices that use isochronous endpoints + * will use them in non-default settings. + * + * The USB specification says that alternate setting numbers must run from + * 0 to one less than the total number of alternate settings. But some + * devices manage to mess this up, and the structures aren't necessarily + * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to + * look up an alternate setting in the altsetting array based on its number. + */ +struct usb_interface { + /* array of alternate settings for this interface, + * stored in no particular order */ + struct usb_host_interface *altsetting; + + struct usb_host_interface *cur_altsetting; /* the currently + * active alternate setting */ + unsigned num_altsetting; /* number of alternate settings */ + + /* If there is an interface association descriptor then it will list + * the associated interfaces */ + struct usb_interface_assoc_descriptor *intf_assoc; + + int minor; /* minor number this interface is + * bound to */ + enum usb_interface_condition condition; /* state of binding */ + unsigned sysfs_files_created:1; /* the sysfs attributes exist */ + unsigned ep_devs_created:1; /* endpoint "devices" exist */ + unsigned unregistering:1; /* unregistration is in progress */ + unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */ + unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */ + unsigned needs_binding:1; /* needs delayed unbind/rebind */ + unsigned resetting_device:1; /* true: bandwidth alloc after reset */ + + struct device dev; /* interface specific device info */ + struct device *usb_dev; + atomic_t pm_usage_cnt; /* usage counter for autosuspend */ + struct work_struct reset_ws; /* for resets in atomic context */ +}; +#define to_usb_interface(d) container_of(d, struct usb_interface, dev) + +static inline void *usb_get_intfdata(struct usb_interface *intf) +{ + return dev_get_drvdata(&intf->dev); +} + +static inline void usb_set_intfdata(struct usb_interface *intf, void *data) +{ + dev_set_drvdata(&intf->dev, data); +} + +struct usb_interface *usb_get_intf(struct usb_interface *intf); +void usb_put_intf(struct usb_interface *intf); + +/* Hard limit */ +#define USB_MAXENDPOINTS 30 +/* this maximum is arbitrary */ +#define USB_MAXINTERFACES 32 +#define USB_MAXIADS (USB_MAXINTERFACES/2) + +/* + * USB Resume Timer: Every Host controller driver should drive the resume + * signalling on the bus for the amount of time defined by this macro. + * + * That way we will have a 'stable' behavior among all HCDs supported by Linux. + * + * Note that the USB Specification states we should drive resume for *at least* + * 20 ms, but it doesn't give an upper bound. This creates two possible + * situations which we want to avoid: + * + * (a) sometimes an msleep(20) might expire slightly before 20 ms, which causes + * us to fail USB Electrical Tests, thus failing Certification + * + * (b) Some (many) devices actually need more than 20 ms of resume signalling, + * and while we can argue that's against the USB Specification, we don't have + * control over which devices a certification laboratory will be using for + * certification. If CertLab uses a device which was tested against Windows and + * that happens to have relaxed resume signalling rules, we might fall into + * situations where we fail interoperability and electrical tests. + * + * In order to avoid both conditions, we're using a 40 ms resume timeout, which + * should cope with both LPJ calibration errors and devices not following every + * detail of the USB Specification. + */ +#define USB_RESUME_TIMEOUT 40 /* ms */ + +/** + * struct usb_interface_cache - long-term representation of a device interface + * @num_altsetting: number of altsettings defined. + * @ref: reference counter. + * @altsetting: variable-length array of interface structures, one for + * each alternate setting that may be selected. Each one includes a + * set of endpoint configurations. They will be in no particular order. + * + * These structures persist for the lifetime of a usb_device, unlike + * struct usb_interface (which persists only as long as its configuration + * is installed). The altsetting arrays can be accessed through these + * structures at any time, permitting comparison of configurations and + * providing support for the /proc/bus/usb/devices pseudo-file. + */ +struct usb_interface_cache { + unsigned num_altsetting; /* number of alternate settings */ + struct kref ref; /* reference counter */ + + /* variable-length array of alternate settings for this interface, + * stored in no particular order */ + struct usb_host_interface altsetting[0]; +}; +#define ref_to_usb_interface_cache(r) \ + container_of(r, struct usb_interface_cache, ref) +#define altsetting_to_usb_interface_cache(a) \ + container_of(a, struct usb_interface_cache, altsetting[0]) + +/** + * struct usb_host_config - representation of a device's configuration + * @desc: the device's configuration descriptor. + * @string: pointer to the cached version of the iConfiguration string, if + * present for this configuration. + * @intf_assoc: list of any interface association descriptors in this config + * @interface: array of pointers to usb_interface structures, one for each + * interface in the configuration. The number of interfaces is stored + * in desc.bNumInterfaces. These pointers are valid only while the + * the configuration is active. + * @intf_cache: array of pointers to usb_interface_cache structures, one + * for each interface in the configuration. These structures exist + * for the entire life of the device. + * @extra: pointer to buffer containing all extra descriptors associated + * with this configuration (those preceding the first interface + * descriptor). + * @extralen: length of the extra descriptors buffer. + * + * USB devices may have multiple configurations, but only one can be active + * at any time. Each encapsulates a different operational environment; + * for example, a dual-speed device would have separate configurations for + * full-speed and high-speed operation. The number of configurations + * available is stored in the device descriptor as bNumConfigurations. + * + * A configuration can contain multiple interfaces. Each corresponds to + * a different function of the USB device, and all are available whenever + * the configuration is active. The USB standard says that interfaces + * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot + * of devices get this wrong. In addition, the interface array is not + * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to + * look up an interface entry based on its number. + * + * Device drivers should not attempt to activate configurations. The choice + * of which configuration to install is a policy decision based on such + * considerations as available power, functionality provided, and the user's + * desires (expressed through userspace tools). However, drivers can call + * usb_reset_configuration() to reinitialize the current configuration and + * all its interfaces. + */ +struct usb_host_config { + struct usb_config_descriptor desc; + + char *string; /* iConfiguration string, if present */ + + /* List of any Interface Association Descriptors in this + * configuration. */ + struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS]; + + /* the interfaces associated with this configuration, + * stored in no particular order */ + struct usb_interface *interface[USB_MAXINTERFACES]; + + /* Interface information available even when this is not the + * active configuration */ + struct usb_interface_cache *intf_cache[USB_MAXINTERFACES]; + + unsigned char *extra; /* Extra descriptors */ + int extralen; +}; + +/* USB2.0 and USB3.0 device BOS descriptor set */ +struct usb_host_bos { + struct usb_bos_descriptor *desc; + + /* wireless cap descriptor is handled by wusb */ + struct usb_ext_cap_descriptor *ext_cap; + struct usb_ss_cap_descriptor *ss_cap; + struct usb_ss_container_id_descriptor *ss_id; +}; + +int __usb_get_extra_descriptor(char *buffer, unsigned size, + unsigned char type, void **ptr); +#define usb_get_extra_descriptor(ifpoint, type, ptr) \ + __usb_get_extra_descriptor((ifpoint)->extra, \ + (ifpoint)->extralen, \ + type, (void **)ptr) + +/* ----------------------------------------------------------------------- */ + +/* USB device number allocation bitmap */ +struct usb_devmap { + unsigned long devicemap[128 / (8*sizeof(unsigned long))]; +}; + +/* + * Allocated per bus (tree of devices) we have: + */ +struct usb_bus { + struct device *controller; /* host/master side hardware */ + int busnum; /* Bus number (in order of reg) */ + const char *bus_name; /* stable id (PCI slot_name etc) */ + u8 uses_dma; /* Does the host controller use DMA? */ + u8 uses_pio_for_control; /* + * Does the host controller use PIO + * for control transfers? + */ + u8 otg_port; /* 0, or number of OTG/HNP port */ + unsigned is_b_host:1; /* true during some HNP roleswitches */ + unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */ + unsigned no_stop_on_short:1; /* + * Quirk: some controllers don't stop + * the ep queue on a short transfer + * with the URB_SHORT_NOT_OK flag set. + */ + unsigned no_sg_constraint:1; /* no sg constraint */ + unsigned sg_tablesize; /* 0 or largest number of sg list entries */ + + int devnum_next; /* Next open device number in + * round-robin allocation */ + + struct usb_devmap devmap; /* device address allocation map */ + struct usb_device *root_hub; /* Root hub */ + struct usb_bus *hs_companion; /* Companion EHCI bus, if any */ + struct list_head bus_list; /* list of busses */ + + struct mutex usb_address0_mutex; /* unaddressed device mutex */ + + int bandwidth_allocated; /* on this bus: how much of the time + * reserved for periodic (intr/iso) + * requests is used, on average? + * Units: microseconds/frame. + * Limits: Full/low speed reserve 90%, + * while high speed reserves 80%. + */ + int bandwidth_int_reqs; /* number of Interrupt requests */ + int bandwidth_isoc_reqs; /* number of Isoc. requests */ + + unsigned resuming_ports; /* bit array: resuming root-hub ports */ + +#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE) + struct mon_bus *mon_bus; /* non-null when associated */ + int monitored; /* non-zero when monitored */ +#endif +}; + +struct usb_dev_state; + +/* ----------------------------------------------------------------------- */ + +struct usb_tt; + +enum usb_device_removable { + USB_DEVICE_REMOVABLE_UNKNOWN = 0, + USB_DEVICE_REMOVABLE, + USB_DEVICE_FIXED, +}; + +enum usb_port_connect_type { + USB_PORT_CONNECT_TYPE_UNKNOWN = 0, + USB_PORT_CONNECT_TYPE_HOT_PLUG, + USB_PORT_CONNECT_TYPE_HARD_WIRED, + USB_PORT_NOT_USED, +}; + +/* + * USB 2.0 Link Power Management (LPM) parameters. + */ +struct usb2_lpm_parameters { + /* Best effort service latency indicate how long the host will drive + * resume on an exit from L1. + */ + unsigned int besl; + + /* Timeout value in microseconds for the L1 inactivity (LPM) timer. + * When the timer counts to zero, the parent hub will initiate a LPM + * transition to L1. + */ + int timeout; +}; + +/* + * USB 3.0 Link Power Management (LPM) parameters. + * + * PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit. + * MEL is the USB 3.0 Link PM latency for host-initiated LPM exit. + * All three are stored in nanoseconds. + */ +struct usb3_lpm_parameters { + /* + * Maximum exit latency (MEL) for the host to send a packet to the + * device (either a Ping for isoc endpoints, or a data packet for + * interrupt endpoints), the hubs to decode the packet, and for all hubs + * in the path to transition the links to U0. + */ + unsigned int mel; + /* + * Maximum exit latency for a device-initiated LPM transition to bring + * all links into U0. Abbreviated as "PEL" in section 9.4.12 of the USB + * 3.0 spec, with no explanation of what "P" stands for. "Path"? + */ + unsigned int pel; + + /* + * The System Exit Latency (SEL) includes PEL, and three other + * latencies. After a device initiates a U0 transition, it will take + * some time from when the device sends the ERDY to when it will finally + * receive the data packet. Basically, SEL should be the worse-case + * latency from when a device starts initiating a U0 transition to when + * it will get data. + */ + unsigned int sel; + /* + * The idle timeout value that is currently programmed into the parent + * hub for this device. When the timer counts to zero, the parent hub + * will initiate an LPM transition to either U1 or U2. + */ + int timeout; +}; + +/** + * struct usb_device - kernel's representation of a USB device + * @devnum: device number; address on a USB bus + * @devpath: device ID string for use in messages (e.g., /port/...) + * @route: tree topology hex string for use with xHCI + * @state: device state: configured, not attached, etc. + * @speed: device speed: high/full/low (or error) + * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub + * @ttport: device port on that tt hub + * @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints + * @parent: our hub, unless we're the root + * @bus: bus we're part of + * @ep0: endpoint 0 data (default control pipe) + * @dev: generic device interface + * @descriptor: USB device descriptor + * @bos: USB device BOS descriptor set + * @config: all of the device's configs + * @actconfig: the active configuration + * @ep_in: array of IN endpoints + * @ep_out: array of OUT endpoints + * @rawdescriptors: raw descriptors for each config + * @bus_mA: Current available from the bus + * @portnum: parent port number (origin 1) + * @level: number of USB hub ancestors + * @can_submit: URBs may be submitted + * @persist_enabled: USB_PERSIST enabled for this device + * @have_langid: whether string_langid is valid + * @authorized: policy has said we can use it; + * (user space) policy determines if we authorize this device to be + * used or not. By default, wired USB devices are authorized. + * WUSB devices are not, until we authorize them from user space. + * FIXME -- complete doc + * @authenticated: Crypto authentication passed + * @wusb: device is Wireless USB + * @lpm_capable: device supports LPM + * @usb2_hw_lpm_capable: device can perform USB2 hardware LPM + * @usb2_hw_lpm_besl_capable: device can perform USB2 hardware BESL LPM + * @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled + * @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled + * @usb3_lpm_enabled: USB3 hardware LPM enabled + * @string_langid: language ID for strings + * @product: iProduct string, if present (static) + * @manufacturer: iManufacturer string, if present (static) + * @serial: iSerialNumber string, if present (static) + * @filelist: usbfs files that are open to this device + * @maxchild: number of ports if hub + * @quirks: quirks of the whole device + * @urbnum: number of URBs submitted for the whole device + * @active_duration: total time device is not suspended + * @connect_time: time device was first connected + * @do_remote_wakeup: remote wakeup should be enabled + * @reset_resume: needs reset instead of resume + * @port_is_suspended: the upstream port is suspended (L2 or U3) + * @wusb_dev: if this is a Wireless USB device, link to the WUSB + * specific data for the device. + * @slot_id: Slot ID assigned by xHCI + * @removable: Device can be physically removed from this port + * @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout. + * @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout. + * @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout. + * @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm() + * to keep track of the number of functions that require USB 3.0 Link Power + * Management to be disabled for this usb_device. This count should only + * be manipulated by those functions, with the bandwidth_mutex is held. + * + * Notes: + * Usbcore drivers should not set usbdev->state directly. Instead use + * usb_set_device_state(). + */ +struct usb_device { + int devnum; + char devpath[16]; + u32 route; + enum usb_device_state state; + enum usb_device_speed speed; + + struct usb_tt *tt; + int ttport; + + unsigned int toggle[2]; + + struct usb_device *parent; + struct usb_bus *bus; + struct usb_host_endpoint ep0; + + struct device dev; + + struct usb_device_descriptor descriptor; + struct usb_host_bos *bos; + struct usb_host_config *config; + + struct usb_host_config *actconfig; + struct usb_host_endpoint *ep_in[16]; + struct usb_host_endpoint *ep_out[16]; + + char **rawdescriptors; + + unsigned short bus_mA; + u8 portnum; + u8 level; + + unsigned can_submit:1; + unsigned persist_enabled:1; + unsigned have_langid:1; + unsigned authorized:1; + unsigned authenticated:1; + unsigned wusb:1; + unsigned lpm_capable:1; + unsigned usb2_hw_lpm_capable:1; + unsigned usb2_hw_lpm_besl_capable:1; + unsigned usb2_hw_lpm_enabled:1; + unsigned usb2_hw_lpm_allowed:1; + unsigned usb3_lpm_enabled:1; + int string_langid; + + /* static strings from the device */ + char *product; + char *manufacturer; + char *serial; + + struct list_head filelist; + + int maxchild; + + u32 quirks; + atomic_t urbnum; + + unsigned long active_duration; + +#ifdef CONFIG_PM + unsigned long connect_time; + + unsigned do_remote_wakeup:1; + unsigned reset_resume:1; + unsigned port_is_suspended:1; +#endif + struct wusb_dev *wusb_dev; + int slot_id; + enum usb_device_removable removable; + struct usb2_lpm_parameters l1_params; + struct usb3_lpm_parameters u1_params; + struct usb3_lpm_parameters u2_params; + unsigned lpm_disable_count; +}; +#define to_usb_device(d) container_of(d, struct usb_device, dev) + +static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf) +{ + return to_usb_device(intf->dev.parent); +} + +extern struct usb_device *usb_get_dev(struct usb_device *dev); +extern void usb_put_dev(struct usb_device *dev); +extern struct usb_device *usb_hub_find_child(struct usb_device *hdev, + int port1); + +/** + * usb_hub_for_each_child - iterate over all child devices on the hub + * @hdev: USB device belonging to the usb hub + * @port1: portnum associated with child device + * @child: child device pointer + */ +#define usb_hub_for_each_child(hdev, port1, child) \ + for (port1 = 1, child = usb_hub_find_child(hdev, port1); \ + port1 <= hdev->maxchild; \ + child = usb_hub_find_child(hdev, ++port1)) \ + if (!child) continue; else + +/* USB device locking */ +#define usb_lock_device(udev) device_lock(&(udev)->dev) +#define usb_unlock_device(udev) device_unlock(&(udev)->dev) +#define usb_trylock_device(udev) device_trylock(&(udev)->dev) +extern int usb_lock_device_for_reset(struct usb_device *udev, + const struct usb_interface *iface); + +/* USB port reset for device reinitialization */ +extern int usb_reset_device(struct usb_device *dev); +extern void usb_queue_reset_device(struct usb_interface *dev); + +#ifdef CONFIG_ACPI +extern int usb_acpi_set_power_state(struct usb_device *hdev, int index, + bool enable); +extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index); +#else +static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index, + bool enable) { return 0; } +static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index) + { return true; } +#endif + +/* USB autosuspend and autoresume */ +#ifdef CONFIG_PM +extern void usb_enable_autosuspend(struct usb_device *udev); +extern void usb_disable_autosuspend(struct usb_device *udev); + +extern int usb_autopm_get_interface(struct usb_interface *intf); +extern void usb_autopm_put_interface(struct usb_interface *intf); +extern int usb_autopm_get_interface_async(struct usb_interface *intf); +extern void usb_autopm_put_interface_async(struct usb_interface *intf); +extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf); +extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf); + +static inline void usb_mark_last_busy(struct usb_device *udev) +{ + pm_runtime_mark_last_busy(&udev->dev); +} + +#else + +static inline int usb_enable_autosuspend(struct usb_device *udev) +{ return 0; } +static inline int usb_disable_autosuspend(struct usb_device *udev) +{ return 0; } + +static inline int usb_autopm_get_interface(struct usb_interface *intf) +{ return 0; } +static inline int usb_autopm_get_interface_async(struct usb_interface *intf) +{ return 0; } + +static inline void usb_autopm_put_interface(struct usb_interface *intf) +{ } +static inline void usb_autopm_put_interface_async(struct usb_interface *intf) +{ } +static inline void usb_autopm_get_interface_no_resume( + struct usb_interface *intf) +{ } +static inline void usb_autopm_put_interface_no_suspend( + struct usb_interface *intf) +{ } +static inline void usb_mark_last_busy(struct usb_device *udev) +{ } +#endif + +extern int usb_disable_lpm(struct usb_device *udev); +extern void usb_enable_lpm(struct usb_device *udev); +/* Same as above, but these functions lock/unlock the bandwidth_mutex. */ +extern int usb_unlocked_disable_lpm(struct usb_device *udev); +extern void usb_unlocked_enable_lpm(struct usb_device *udev); + +extern int usb_disable_ltm(struct usb_device *udev); +extern void usb_enable_ltm(struct usb_device *udev); + +static inline bool usb_device_supports_ltm(struct usb_device *udev) +{ + if (udev->speed != USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap) + return false; + return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; +} + +static inline bool usb_device_no_sg_constraint(struct usb_device *udev) +{ + return udev && udev->bus && udev->bus->no_sg_constraint; +} + + +/*-------------------------------------------------------------------------*/ + +/* for drivers using iso endpoints */ +extern int usb_get_current_frame_number(struct usb_device *usb_dev); + +/* Sets up a group of bulk endpoints to support multiple stream IDs. */ +extern int usb_alloc_streams(struct usb_interface *interface, + struct usb_host_endpoint **eps, unsigned int num_eps, + unsigned int num_streams, gfp_t mem_flags); + +/* Reverts a group of bulk endpoints back to not using stream IDs. */ +extern int usb_free_streams(struct usb_interface *interface, + struct usb_host_endpoint **eps, unsigned int num_eps, + gfp_t mem_flags); + +/* used these for multi-interface device registration */ +extern int usb_driver_claim_interface(struct usb_driver *driver, + struct usb_interface *iface, void *priv); + +/** + * usb_interface_claimed - returns true iff an interface is claimed + * @iface: the interface being checked + * + * Return: %true (nonzero) iff the interface is claimed, else %false + * (zero). + * + * Note: + * Callers must own the driver model's usb bus readlock. So driver + * probe() entries don't need extra locking, but other call contexts + * may need to explicitly claim that lock. + * + */ +static inline int usb_interface_claimed(struct usb_interface *iface) +{ + return (iface->dev.driver != NULL); +} + +extern void usb_driver_release_interface(struct usb_driver *driver, + struct usb_interface *iface); +const struct usb_device_id *usb_match_id(struct usb_interface *interface, + const struct usb_device_id *id); +extern int usb_match_one_id(struct usb_interface *interface, + const struct usb_device_id *id); + +extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)); +extern struct usb_interface *usb_find_interface(struct usb_driver *drv, + int minor); +extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, + unsigned ifnum); +extern struct usb_host_interface *usb_altnum_to_altsetting( + const struct usb_interface *intf, unsigned int altnum); +extern struct usb_host_interface *usb_find_alt_setting( + struct usb_host_config *config, + unsigned int iface_num, + unsigned int alt_num); + +/* port claiming functions */ +int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, + struct usb_dev_state *owner); +int usb_hub_release_port(struct usb_device *hdev, unsigned port1, + struct usb_dev_state *owner); + +/** + * usb_make_path - returns stable device path in the usb tree + * @dev: the device whose path is being constructed + * @buf: where to put the string + * @size: how big is "buf"? + * + * Return: Length of the string (> 0) or negative if size was too small. + * + * Note: + * This identifier is intended to be "stable", reflecting physical paths in + * hardware such as physical bus addresses for host controllers or ports on + * USB hubs. That makes it stay the same until systems are physically + * reconfigured, by re-cabling a tree of USB devices or by moving USB host + * controllers. Adding and removing devices, including virtual root hubs + * in host controller driver modules, does not change these path identifiers; + * neither does rebooting or re-enumerating. These are more useful identifiers + * than changeable ("unstable") ones like bus numbers or device addresses. + * + * With a partial exception for devices connected to USB 2.0 root hubs, these + * identifiers are also predictable. So long as the device tree isn't changed, + * plugging any USB device into a given hub port always gives it the same path. + * Because of the use of "companion" controllers, devices connected to ports on + * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are + * high speed, and a different one if they are full or low speed. + */ +static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size) +{ + int actual; + actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name, + dev->devpath); + return (actual >= (int)size) ? -1 : actual; +} + +/*-------------------------------------------------------------------------*/ + +#define USB_DEVICE_ID_MATCH_DEVICE \ + (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT) +#define USB_DEVICE_ID_MATCH_DEV_RANGE \ + (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI) +#define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \ + (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE) +#define USB_DEVICE_ID_MATCH_DEV_INFO \ + (USB_DEVICE_ID_MATCH_DEV_CLASS | \ + USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \ + USB_DEVICE_ID_MATCH_DEV_PROTOCOL) +#define USB_DEVICE_ID_MATCH_INT_INFO \ + (USB_DEVICE_ID_MATCH_INT_CLASS | \ + USB_DEVICE_ID_MATCH_INT_SUBCLASS | \ + USB_DEVICE_ID_MATCH_INT_PROTOCOL) + +/** + * USB_DEVICE - macro used to describe a specific usb device + * @vend: the 16 bit USB Vendor ID + * @prod: the 16 bit USB Product ID + * + * This macro is used to create a struct usb_device_id that matches a + * specific device. + */ +#define USB_DEVICE(vend, prod) \ + .match_flags = USB_DEVICE_ID_MATCH_DEVICE, \ + .idVendor = (vend), \ + .idProduct = (prod) +/** + * USB_DEVICE_VER - describe a specific usb device with a version range + * @vend: the 16 bit USB Vendor ID + * @prod: the 16 bit USB Product ID + * @lo: the bcdDevice_lo value + * @hi: the bcdDevice_hi value + * + * This macro is used to create a struct usb_device_id that matches a + * specific device, with a version range. + */ +#define USB_DEVICE_VER(vend, prod, lo, hi) \ + .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \ + .idVendor = (vend), \ + .idProduct = (prod), \ + .bcdDevice_lo = (lo), \ + .bcdDevice_hi = (hi) + +/** + * USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class + * @vend: the 16 bit USB Vendor ID + * @prod: the 16 bit USB Product ID + * @cl: bInterfaceClass value + * + * This macro is used to create a struct usb_device_id that matches a + * specific interface class of devices. + */ +#define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \ + .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ + USB_DEVICE_ID_MATCH_INT_CLASS, \ + .idVendor = (vend), \ + .idProduct = (prod), \ + .bInterfaceClass = (cl) + +/** + * USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol + * @vend: the 16 bit USB Vendor ID + * @prod: the 16 bit USB Product ID + * @pr: bInterfaceProtocol value + * + * This macro is used to create a struct usb_device_id that matches a + * specific interface protocol of devices. + */ +#define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \ + .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ + USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ + .idVendor = (vend), \ + .idProduct = (prod), \ + .bInterfaceProtocol = (pr) + +/** + * USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number + * @vend: the 16 bit USB Vendor ID + * @prod: the 16 bit USB Product ID + * @num: bInterfaceNumber value + * + * This macro is used to create a struct usb_device_id that matches a + * specific interface number of devices. + */ +#define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \ + .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ + USB_DEVICE_ID_MATCH_INT_NUMBER, \ + .idVendor = (vend), \ + .idProduct = (prod), \ + .bInterfaceNumber = (num) + +/** + * USB_DEVICE_INFO - macro used to describe a class of usb devices + * @cl: bDeviceClass value + * @sc: bDeviceSubClass value + * @pr: bDeviceProtocol value + * + * This macro is used to create a struct usb_device_id that matches a + * specific class of devices. + */ +#define USB_DEVICE_INFO(cl, sc, pr) \ + .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \ + .bDeviceClass = (cl), \ + .bDeviceSubClass = (sc), \ + .bDeviceProtocol = (pr) + +/** + * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces + * @cl: bInterfaceClass value + * @sc: bInterfaceSubClass value + * @pr: bInterfaceProtocol value + * + * This macro is used to create a struct usb_device_id that matches a + * specific class of interfaces. + */ +#define USB_INTERFACE_INFO(cl, sc, pr) \ + .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \ + .bInterfaceClass = (cl), \ + .bInterfaceSubClass = (sc), \ + .bInterfaceProtocol = (pr) + +/** + * USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces + * @vend: the 16 bit USB Vendor ID + * @prod: the 16 bit USB Product ID + * @cl: bInterfaceClass value + * @sc: bInterfaceSubClass value + * @pr: bInterfaceProtocol value + * + * This macro is used to create a struct usb_device_id that matches a + * specific device with a specific class of interfaces. + * + * This is especially useful when explicitly matching devices that have + * vendor specific bDeviceClass values, but standards-compliant interfaces. + */ +#define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \ + .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ + | USB_DEVICE_ID_MATCH_DEVICE, \ + .idVendor = (vend), \ + .idProduct = (prod), \ + .bInterfaceClass = (cl), \ + .bInterfaceSubClass = (sc), \ + .bInterfaceProtocol = (pr) + +/** + * USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces + * @vend: the 16 bit USB Vendor ID + * @cl: bInterfaceClass value + * @sc: bInterfaceSubClass value + * @pr: bInterfaceProtocol value + * + * This macro is used to create a struct usb_device_id that matches a + * specific vendor with a specific class of interfaces. + * + * This is especially useful when explicitly matching devices that have + * vendor specific bDeviceClass values, but standards-compliant interfaces. + */ +#define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \ + .match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ + | USB_DEVICE_ID_MATCH_VENDOR, \ + .idVendor = (vend), \ + .bInterfaceClass = (cl), \ + .bInterfaceSubClass = (sc), \ + .bInterfaceProtocol = (pr) + +/* ----------------------------------------------------------------------- */ + +/* Stuff for dynamic usb ids */ +struct usb_dynids { + spinlock_t lock; + struct list_head list; +}; + +struct usb_dynid { + struct list_head node; + struct usb_device_id id; +}; + +extern ssize_t usb_store_new_id(struct usb_dynids *dynids, + const struct usb_device_id *id_table, + struct device_driver *driver, + const char *buf, size_t count); + +extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf); + +/** + * struct usbdrv_wrap - wrapper for driver-model structure + * @driver: The driver-model core driver structure. + * @for_devices: Non-zero for device drivers, 0 for interface drivers. + */ +struct usbdrv_wrap { + struct device_driver driver; + int for_devices; +}; + +/** + * struct usb_driver - identifies USB interface driver to usbcore + * @name: The driver name should be unique among USB drivers, + * and should normally be the same as the module name. + * @probe: Called to see if the driver is willing to manage a particular + * interface on a device. If it is, probe returns zero and uses + * usb_set_intfdata() to associate driver-specific data with the + * interface. It may also use usb_set_interface() to specify the + * appropriate altsetting. If unwilling to manage the interface, + * return -ENODEV, if genuine IO errors occurred, an appropriate + * negative errno value. + * @disconnect: Called when the interface is no longer accessible, usually + * because its device has been (or is being) disconnected or the + * driver module is being unloaded. + * @unlocked_ioctl: Used for drivers that want to talk to userspace through + * the "usbfs" filesystem. This lets devices provide ways to + * expose information to user space regardless of where they + * do (or don't) show up otherwise in the filesystem. + * @suspend: Called when the device is going to be suspended by the + * system either from system sleep or runtime suspend context. The + * return value will be ignored in system sleep context, so do NOT + * try to continue using the device if suspend fails in this case. + * Instead, let the resume or reset-resume routine recover from + * the failure. + * @resume: Called when the device is being resumed by the system. + * @reset_resume: Called when the suspended device has been reset instead + * of being resumed. + * @pre_reset: Called by usb_reset_device() when the device is about to be + * reset. This routine must not return until the driver has no active + * URBs for the device, and no more URBs may be submitted until the + * post_reset method is called. + * @post_reset: Called by usb_reset_device() after the device + * has been reset + * @id_table: USB drivers use ID table to support hotplugging. + * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set + * or your driver's probe function will never get called. + * @dynids: used internally to hold the list of dynamically added device + * ids for this driver. + * @drvwrap: Driver-model core structure wrapper. + * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be + * added to this driver by preventing the sysfs file from being created. + * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend + * for interfaces bound to this driver. + * @soft_unbind: if set to 1, the USB core will not kill URBs and disable + * endpoints before calling the driver's disconnect method. + * @disable_hub_initiated_lpm: if set to 0, the USB core will not allow hubs + * to initiate lower power link state transitions when an idle timeout + * occurs. Device-initiated USB 3.0 link PM will still be allowed. + * + * USB interface drivers must provide a name, probe() and disconnect() + * methods, and an id_table. Other driver fields are optional. + * + * The id_table is used in hotplugging. It holds a set of descriptors, + * and specialized data may be associated with each entry. That table + * is used by both user and kernel mode hotplugging support. + * + * The probe() and disconnect() methods are called in a context where + * they can sleep, but they should avoid abusing the privilege. Most + * work to connect to a device should be done when the device is opened, + * and undone at the last close. The disconnect code needs to address + * concurrency issues with respect to open() and close() methods, as + * well as forcing all pending I/O requests to complete (by unlinking + * them as necessary, and blocking until the unlinks complete). + */ +struct usb_driver { + const char *name; + + int (*probe) (struct usb_interface *intf, + const struct usb_device_id *id); + + void (*disconnect) (struct usb_interface *intf); + + int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code, + void *buf); + + int (*suspend) (struct usb_interface *intf, pm_message_t message); + int (*resume) (struct usb_interface *intf); + int (*reset_resume)(struct usb_interface *intf); + + int (*pre_reset)(struct usb_interface *intf); + int (*post_reset)(struct usb_interface *intf); + + const struct usb_device_id *id_table; + + struct usb_dynids dynids; + struct usbdrv_wrap drvwrap; + unsigned int no_dynamic_id:1; + unsigned int supports_autosuspend:1; + unsigned int disable_hub_initiated_lpm:1; + unsigned int soft_unbind:1; +}; +#define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver) + +/** + * struct usb_device_driver - identifies USB device driver to usbcore + * @name: The driver name should be unique among USB drivers, + * and should normally be the same as the module name. + * @probe: Called to see if the driver is willing to manage a particular + * device. If it is, probe returns zero and uses dev_set_drvdata() + * to associate driver-specific data with the device. If unwilling + * to manage the device, return a negative errno value. + * @disconnect: Called when the device is no longer accessible, usually + * because it has been (or is being) disconnected or the driver's + * module is being unloaded. + * @suspend: Called when the device is going to be suspended by the system. + * @resume: Called when the device is being resumed by the system. + * @drvwrap: Driver-model core structure wrapper. + * @supports_autosuspend: if set to 0, the USB core will not allow autosuspend + * for devices bound to this driver. + * + * USB drivers must provide all the fields listed above except drvwrap. + */ +struct usb_device_driver { + const char *name; + + int (*probe) (struct usb_device *udev); + void (*disconnect) (struct usb_device *udev); + + int (*suspend) (struct usb_device *udev, pm_message_t message); + int (*resume) (struct usb_device *udev, pm_message_t message); + struct usbdrv_wrap drvwrap; + unsigned int supports_autosuspend:1; +}; +#define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \ + drvwrap.driver) + +extern struct bus_type usb_bus_type; + +/** + * struct usb_class_driver - identifies a USB driver that wants to use the USB major number + * @name: the usb class device name for this driver. Will show up in sysfs. + * @devnode: Callback to provide a naming hint for a possible + * device node to create. + * @fops: pointer to the struct file_operations of this driver. + * @minor_base: the start of the minor range for this driver. + * + * This structure is used for the usb_register_dev() and + * usb_unregister_dev() functions, to consolidate a number of the + * parameters used for them. + */ +struct usb_class_driver { + char *name; + char *(*devnode)(struct device *dev, umode_t *mode); + const struct file_operations *fops; + int minor_base; +}; + +/* + * use these in module_init()/module_exit() + * and don't forget MODULE_DEVICE_TABLE(usb, ...) + */ +extern int usb_register_driver(struct usb_driver *, struct module *, + const char *); + +/* use a define to avoid include chaining to get THIS_MODULE & friends */ +#define usb_register(driver) \ + usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME) + +extern void usb_deregister(struct usb_driver *); + +/** + * module_usb_driver() - Helper macro for registering a USB driver + * @__usb_driver: usb_driver struct + * + * Helper macro for USB drivers which do not do anything special in module + * init/exit. This eliminates a lot of boilerplate. Each module may only + * use this macro once, and calling it replaces module_init() and module_exit() + */ +#define module_usb_driver(__usb_driver) \ + module_driver(__usb_driver, usb_register, \ + usb_deregister) + +extern int usb_register_device_driver(struct usb_device_driver *, + struct module *); +extern void usb_deregister_device_driver(struct usb_device_driver *); + +extern int usb_register_dev(struct usb_interface *intf, + struct usb_class_driver *class_driver); +extern void usb_deregister_dev(struct usb_interface *intf, + struct usb_class_driver *class_driver); + +extern int usb_disabled(void); + +/* ----------------------------------------------------------------------- */ + +/* + * URB support, for asynchronous request completions + */ + +/* + * urb->transfer_flags: + * + * Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb(). + */ +#define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */ +#define URB_ISO_ASAP 0x0002 /* iso-only; use the first unexpired + * slot in the schedule */ +#define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */ +#define URB_NO_FSBR 0x0020 /* UHCI-specific */ +#define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */ +#define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt + * needed */ +#define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */ + +/* The following flags are used internally by usbcore and HCDs */ +#define URB_DIR_IN 0x0200 /* Transfer from device to host */ +#define URB_DIR_OUT 0 +#define URB_DIR_MASK URB_DIR_IN + +#define URB_DMA_MAP_SINGLE 0x00010000 /* Non-scatter-gather mapping */ +#define URB_DMA_MAP_PAGE 0x00020000 /* HCD-unsupported S-G */ +#define URB_DMA_MAP_SG 0x00040000 /* HCD-supported S-G */ +#define URB_MAP_LOCAL 0x00080000 /* HCD-local-memory mapping */ +#define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */ +#define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */ +#define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */ +#define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */ + +struct usb_iso_packet_descriptor { + unsigned int offset; + unsigned int length; /* expected length */ + unsigned int actual_length; + int status; +}; + +struct urb; + +struct usb_anchor { + struct list_head urb_list; + wait_queue_head_t wait; + spinlock_t lock; + atomic_t suspend_wakeups; + unsigned int poisoned:1; +}; + +static inline void init_usb_anchor(struct usb_anchor *anchor) +{ + memset(anchor, 0, sizeof(*anchor)); + INIT_LIST_HEAD(&anchor->urb_list); + init_waitqueue_head(&anchor->wait); + spin_lock_init(&anchor->lock); +} + +typedef void (*usb_complete_t)(struct urb *); + +/** + * struct urb - USB Request Block + * @urb_list: For use by current owner of the URB. + * @anchor_list: membership in the list of an anchor + * @anchor: to anchor URBs to a common mooring + * @ep: Points to the endpoint's data structure. Will eventually + * replace @pipe. + * @pipe: Holds endpoint number, direction, type, and more. + * Create these values with the eight macros available; + * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl" + * (control), "bulk", "int" (interrupt), or "iso" (isochronous). + * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint + * numbers range from zero to fifteen. Note that "in" endpoint two + * is a different endpoint (and pipe) from "out" endpoint two. + * The current configuration controls the existence, type, and + * maximum packet size of any given endpoint. + * @stream_id: the endpoint's stream ID for bulk streams + * @dev: Identifies the USB device to perform the request. + * @status: This is read in non-iso completion functions to get the + * status of the particular request. ISO requests only use it + * to tell whether the URB was unlinked; detailed status for + * each frame is in the fields of the iso_frame-desc. + * @transfer_flags: A variety of flags may be used to affect how URB + * submission, unlinking, or operation are handled. Different + * kinds of URB can use different flags. + * @transfer_buffer: This identifies the buffer to (or from) which the I/O + * request will be performed unless URB_NO_TRANSFER_DMA_MAP is set + * (however, do not leave garbage in transfer_buffer even then). + * This buffer must be suitable for DMA; allocate it with + * kmalloc() or equivalent. For transfers to "in" endpoints, contents + * of this buffer will be modified. This buffer is used for the data + * stage of control transfers. + * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP, + * the device driver is saying that it provided this DMA address, + * which the host controller driver should use in preference to the + * transfer_buffer. + * @sg: scatter gather buffer list, the buffer size of each element in + * the list (except the last) must be divisible by the endpoint's + * max packet size if no_sg_constraint isn't set in 'struct usb_bus' + * @num_mapped_sgs: (internal) number of mapped sg entries + * @num_sgs: number of entries in the sg list + * @transfer_buffer_length: How big is transfer_buffer. The transfer may + * be broken up into chunks according to the current maximum packet + * size for the endpoint, which is a function of the configuration + * and is encoded in the pipe. When the length is zero, neither + * transfer_buffer nor transfer_dma is used. + * @actual_length: This is read in non-iso completion functions, and + * it tells how many bytes (out of transfer_buffer_length) were + * transferred. It will normally be the same as requested, unless + * either an error was reported or a short read was performed. + * The URB_SHORT_NOT_OK transfer flag may be used to make such + * short reads be reported as errors. + * @setup_packet: Only used for control transfers, this points to eight bytes + * of setup data. Control transfers always start by sending this data + * to the device. Then transfer_buffer is read or written, if needed. + * @setup_dma: DMA pointer for the setup packet. The caller must not use + * this field; setup_packet must point to a valid buffer. + * @start_frame: Returns the initial frame for isochronous transfers. + * @number_of_packets: Lists the number of ISO transfer buffers. + * @interval: Specifies the polling interval for interrupt or isochronous + * transfers. The units are frames (milliseconds) for full and low + * speed devices, and microframes (1/8 millisecond) for highspeed + * and SuperSpeed devices. + * @error_count: Returns the number of ISO transfers that reported errors. + * @context: For use in completion functions. This normally points to + * request-specific driver context. + * @complete: Completion handler. This URB is passed as the parameter to the + * completion function. The completion function may then do what + * it likes with the URB, including resubmitting or freeing it. + * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to + * collect the transfer status for each buffer. + * + * This structure identifies USB transfer requests. URBs must be allocated by + * calling usb_alloc_urb() and freed with a call to usb_free_urb(). + * Initialization may be done using various usb_fill_*_urb() functions. URBs + * are submitted using usb_submit_urb(), and pending requests may be canceled + * using usb_unlink_urb() or usb_kill_urb(). + * + * Data Transfer Buffers: + * + * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise + * taken from the general page pool. That is provided by transfer_buffer + * (control requests also use setup_packet), and host controller drivers + * perform a dma mapping (and unmapping) for each buffer transferred. Those + * mapping operations can be expensive on some platforms (perhaps using a dma + * bounce buffer or talking to an IOMMU), + * although they're cheap on commodity x86 and ppc hardware. + * + * Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag, + * which tells the host controller driver that no such mapping is needed for + * the transfer_buffer since + * the device driver is DMA-aware. For example, a device driver might + * allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map(). + * When this transfer flag is provided, host controller drivers will + * attempt to use the dma address found in the transfer_dma + * field rather than determining a dma address themselves. + * + * Note that transfer_buffer must still be set if the controller + * does not support DMA (as indicated by bus.uses_dma) and when talking + * to root hub. If you have to trasfer between highmem zone and the device + * on such controller, create a bounce buffer or bail out with an error. + * If transfer_buffer cannot be set (is in highmem) and the controller is DMA + * capable, assign NULL to it, so that usbmon knows not to use the value. + * The setup_packet must always be set, so it cannot be located in highmem. + * + * Initialization: + * + * All URBs submitted must initialize the dev, pipe, transfer_flags (may be + * zero), and complete fields. All URBs must also initialize + * transfer_buffer and transfer_buffer_length. They may provide the + * URB_SHORT_NOT_OK transfer flag, indicating that short reads are + * to be treated as errors; that flag is invalid for write requests. + * + * Bulk URBs may + * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers + * should always terminate with a short packet, even if it means adding an + * extra zero length packet. + * + * Control URBs must provide a valid pointer in the setup_packet field. + * Unlike the transfer_buffer, the setup_packet may not be mapped for DMA + * beforehand. + * + * Interrupt URBs must provide an interval, saying how often (in milliseconds + * or, for highspeed devices, 125 microsecond units) + * to poll for transfers. After the URB has been submitted, the interval + * field reflects how the transfer was actually scheduled. + * The polling interval may be more frequent than requested. + * For example, some controllers have a maximum interval of 32 milliseconds, + * while others support intervals of up to 1024 milliseconds. + * Isochronous URBs also have transfer intervals. (Note that for isochronous + * endpoints, as well as high speed interrupt endpoints, the encoding of + * the transfer interval in the endpoint descriptor is logarithmic. + * Device drivers must convert that value to linear units themselves.) + * + * If an isochronous endpoint queue isn't already running, the host + * controller will schedule a new URB to start as soon as bandwidth + * utilization allows. If the queue is running then a new URB will be + * scheduled to start in the first transfer slot following the end of the + * preceding URB, if that slot has not already expired. If the slot has + * expired (which can happen when IRQ delivery is delayed for a long time), + * the scheduling behavior depends on the URB_ISO_ASAP flag. If the flag + * is clear then the URB will be scheduled to start in the expired slot, + * implying that some of its packets will not be transferred; if the flag + * is set then the URB will be scheduled in the first unexpired slot, + * breaking the queue's synchronization. Upon URB completion, the + * start_frame field will be set to the (micro)frame number in which the + * transfer was scheduled. Ranges for frame counter values are HC-specific + * and can go from as low as 256 to as high as 65536 frames. + * + * Isochronous URBs have a different data transfer model, in part because + * the quality of service is only "best effort". Callers provide specially + * allocated URBs, with number_of_packets worth of iso_frame_desc structures + * at the end. Each such packet is an individual ISO transfer. Isochronous + * URBs are normally queued, submitted by drivers to arrange that + * transfers are at least double buffered, and then explicitly resubmitted + * in completion handlers, so + * that data (such as audio or video) streams at as constant a rate as the + * host controller scheduler can support. + * + * Completion Callbacks: + * + * The completion callback is made in_interrupt(), and one of the first + * things that a completion handler should do is check the status field. + * The status field is provided for all URBs. It is used to report + * unlinked URBs, and status for all non-ISO transfers. It should not + * be examined before the URB is returned to the completion handler. + * + * The context field is normally used to link URBs back to the relevant + * driver or request state. + * + * When the completion callback is invoked for non-isochronous URBs, the + * actual_length field tells how many bytes were transferred. This field + * is updated even when the URB terminated with an error or was unlinked. + * + * ISO transfer status is reported in the status and actual_length fields + * of the iso_frame_desc array, and the number of errors is reported in + * error_count. Completion callbacks for ISO transfers will normally + * (re)submit URBs to ensure a constant transfer rate. + * + * Note that even fields marked "public" should not be touched by the driver + * when the urb is owned by the hcd, that is, since the call to + * usb_submit_urb() till the entry into the completion routine. + */ +struct urb { + /* private: usb core and host controller only fields in the urb */ + struct kref kref; /* reference count of the URB */ + void *hcpriv; /* private data for host controller */ + atomic_t use_count; /* concurrent submissions counter */ + atomic_t reject; /* submissions will fail */ + int unlinked; /* unlink error code */ + + /* public: documented fields in the urb that can be used by drivers */ + struct list_head urb_list; /* list head for use by the urb's + * current owner */ + struct list_head anchor_list; /* the URB may be anchored */ + struct usb_anchor *anchor; + struct usb_device *dev; /* (in) pointer to associated device */ + struct usb_host_endpoint *ep; /* (internal) pointer to endpoint */ + unsigned int pipe; /* (in) pipe information */ + unsigned int stream_id; /* (in) stream ID */ + int status; /* (return) non-ISO status */ + unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/ + void *transfer_buffer; /* (in) associated data buffer */ + dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */ + struct scatterlist *sg; /* (in) scatter gather buffer list */ + int num_mapped_sgs; /* (internal) mapped sg entries */ + int num_sgs; /* (in) number of entries in the sg list */ + u32 transfer_buffer_length; /* (in) data buffer length */ + u32 actual_length; /* (return) actual transfer length */ + unsigned char *setup_packet; /* (in) setup packet (control only) */ + dma_addr_t setup_dma; /* (in) dma addr for setup_packet */ + int start_frame; /* (modify) start frame (ISO) */ + int number_of_packets; /* (in) number of ISO packets */ + int interval; /* (modify) transfer interval + * (INT/ISO) */ + int error_count; /* (return) number of ISO errors */ + void *context; /* (in) context for completion */ + usb_complete_t complete; /* (in) completion routine */ + struct usb_iso_packet_descriptor iso_frame_desc[0]; + /* (in) ISO ONLY */ +}; + +/* ----------------------------------------------------------------------- */ + +/** + * usb_fill_control_urb - initializes a control urb + * @urb: pointer to the urb to initialize. + * @dev: pointer to the struct usb_device for this urb. + * @pipe: the endpoint pipe + * @setup_packet: pointer to the setup_packet buffer + * @transfer_buffer: pointer to the transfer buffer + * @buffer_length: length of the transfer buffer + * @complete_fn: pointer to the usb_complete_t function + * @context: what to set the urb context to. + * + * Initializes a control urb with the proper information needed to submit + * it to a device. + */ +static inline void usb_fill_control_urb(struct urb *urb, + struct usb_device *dev, + unsigned int pipe, + unsigned char *setup_packet, + void *transfer_buffer, + int buffer_length, + usb_complete_t complete_fn, + void *context) +{ + urb->dev = dev; + urb->pipe = pipe; + urb->setup_packet = setup_packet; + urb->transfer_buffer = transfer_buffer; + urb->transfer_buffer_length = buffer_length; + urb->complete = complete_fn; + urb->context = context; +} + +/** + * usb_fill_bulk_urb - macro to help initialize a bulk urb + * @urb: pointer to the urb to initialize. + * @dev: pointer to the struct usb_device for this urb. + * @pipe: the endpoint pipe + * @transfer_buffer: pointer to the transfer buffer + * @buffer_length: length of the transfer buffer + * @complete_fn: pointer to the usb_complete_t function + * @context: what to set the urb context to. + * + * Initializes a bulk urb with the proper information needed to submit it + * to a device. + */ +static inline void usb_fill_bulk_urb(struct urb *urb, + struct usb_device *dev, + unsigned int pipe, + void *transfer_buffer, + int buffer_length, + usb_complete_t complete_fn, + void *context) +{ + urb->dev = dev; + urb->pipe = pipe; + urb->transfer_buffer = transfer_buffer; + urb->transfer_buffer_length = buffer_length; + urb->complete = complete_fn; + urb->context = context; +} + +/** + * usb_fill_int_urb - macro to help initialize a interrupt urb + * @urb: pointer to the urb to initialize. + * @dev: pointer to the struct usb_device for this urb. + * @pipe: the endpoint pipe + * @transfer_buffer: pointer to the transfer buffer + * @buffer_length: length of the transfer buffer + * @complete_fn: pointer to the usb_complete_t function + * @context: what to set the urb context to. + * @interval: what to set the urb interval to, encoded like + * the endpoint descriptor's bInterval value. + * + * Initializes a interrupt urb with the proper information needed to submit + * it to a device. + * + * Note that High Speed and SuperSpeed interrupt endpoints use a logarithmic + * encoding of the endpoint interval, and express polling intervals in + * microframes (eight per millisecond) rather than in frames (one per + * millisecond). + * + * Wireless USB also uses the logarithmic encoding, but specifies it in units of + * 128us instead of 125us. For Wireless USB devices, the interval is passed + * through to the host controller, rather than being translated into microframe + * units. + */ +static inline void usb_fill_int_urb(struct urb *urb, + struct usb_device *dev, + unsigned int pipe, + void *transfer_buffer, + int buffer_length, + usb_complete_t complete_fn, + void *context, + int interval) +{ + urb->dev = dev; + urb->pipe = pipe; + urb->transfer_buffer = transfer_buffer; + urb->transfer_buffer_length = buffer_length; + urb->complete = complete_fn; + urb->context = context; + + if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER) { + /* make sure interval is within allowed range */ + interval = clamp(interval, 1, 16); + + urb->interval = 1 << (interval - 1); + } else { + urb->interval = interval; + } + + urb->start_frame = -1; +} + +extern void usb_init_urb(struct urb *urb); +extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags); +extern void usb_free_urb(struct urb *urb); +#define usb_put_urb usb_free_urb +extern struct urb *usb_get_urb(struct urb *urb); +extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags); +extern int usb_unlink_urb(struct urb *urb); +extern void usb_kill_urb(struct urb *urb); +extern void usb_poison_urb(struct urb *urb); +extern void usb_unpoison_urb(struct urb *urb); +extern void usb_block_urb(struct urb *urb); +extern void usb_kill_anchored_urbs(struct usb_anchor *anchor); +extern void usb_poison_anchored_urbs(struct usb_anchor *anchor); +extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor); +extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor); +extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor); +extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor); +extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor); +extern void usb_unanchor_urb(struct urb *urb); +extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor, + unsigned int timeout); +extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor); +extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor); +extern int usb_anchor_empty(struct usb_anchor *anchor); + +#define usb_unblock_urb usb_unpoison_urb + +/** + * usb_urb_dir_in - check if an URB describes an IN transfer + * @urb: URB to be checked + * + * Return: 1 if @urb describes an IN transfer (device-to-host), + * otherwise 0. + */ +static inline int usb_urb_dir_in(struct urb *urb) +{ + return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN; +} + +/** + * usb_urb_dir_out - check if an URB describes an OUT transfer + * @urb: URB to be checked + * + * Return: 1 if @urb describes an OUT transfer (host-to-device), + * otherwise 0. + */ +static inline int usb_urb_dir_out(struct urb *urb) +{ + return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT; +} + +void *usb_alloc_coherent(struct usb_device *dev, size_t size, + gfp_t mem_flags, dma_addr_t *dma); +void usb_free_coherent(struct usb_device *dev, size_t size, + void *addr, dma_addr_t dma); + +#if 0 +struct urb *usb_buffer_map(struct urb *urb); +void usb_buffer_dmasync(struct urb *urb); +void usb_buffer_unmap(struct urb *urb); +#endif + +struct scatterlist; +int usb_buffer_map_sg(const struct usb_device *dev, int is_in, + struct scatterlist *sg, int nents); +#if 0 +void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, + struct scatterlist *sg, int n_hw_ents); +#endif +void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, + struct scatterlist *sg, int n_hw_ents); + +/*-------------------------------------------------------------------* + * SYNCHRONOUS CALL SUPPORT * + *-------------------------------------------------------------------*/ + +extern int usb_control_msg(struct usb_device *dev, unsigned int pipe, + __u8 request, __u8 requesttype, __u16 value, __u16 index, + void *data, __u16 size, int timeout); +extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, + void *data, int len, int *actual_length, int timeout); +extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, + void *data, int len, int *actual_length, + int timeout); + +/* wrappers around usb_control_msg() for the most common standard requests */ +extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype, + unsigned char descindex, void *buf, int size); +extern int usb_get_status(struct usb_device *dev, + int type, int target, void *data); +extern int usb_string(struct usb_device *dev, int index, + char *buf, size_t size); + +/* wrappers that also update important state inside usbcore */ +extern int usb_clear_halt(struct usb_device *dev, int pipe); +extern int usb_reset_configuration(struct usb_device *dev); +extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate); +extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr); + +/* this request isn't really synchronous, but it belongs with the others */ +extern int usb_driver_set_configuration(struct usb_device *udev, int config); + +/* choose and set configuration for device */ +extern int usb_choose_configuration(struct usb_device *udev); +extern int usb_set_configuration(struct usb_device *dev, int configuration); + +/* + * timeouts, in milliseconds, used for sending/receiving control messages + * they typically complete within a few frames (msec) after they're issued + * USB identifies 5 second timeouts, maybe more in a few cases, and a few + * slow devices (like some MGE Ellipse UPSes) actually push that limit. + */ +#define USB_CTRL_GET_TIMEOUT 5000 +#define USB_CTRL_SET_TIMEOUT 5000 + + +/** + * struct usb_sg_request - support for scatter/gather I/O + * @status: zero indicates success, else negative errno + * @bytes: counts bytes transferred. + * + * These requests are initialized using usb_sg_init(), and then are used + * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most + * members of the request object aren't for driver access. + * + * The status and bytecount values are valid only after usb_sg_wait() + * returns. If the status is zero, then the bytecount matches the total + * from the request. + * + * After an error completion, drivers may need to clear a halt condition + * on the endpoint. + */ +struct usb_sg_request { + int status; + size_t bytes; + + /* private: + * members below are private to usbcore, + * and are not provided for driver access! + */ + spinlock_t lock; + + struct usb_device *dev; + int pipe; + + int entries; + struct urb **urbs; + + int count; + struct completion complete; +}; + +int usb_sg_init( + struct usb_sg_request *io, + struct usb_device *dev, + unsigned pipe, + unsigned period, + struct scatterlist *sg, + int nents, + size_t length, + gfp_t mem_flags +); +void usb_sg_cancel(struct usb_sg_request *io); +void usb_sg_wait(struct usb_sg_request *io); + + +/* ----------------------------------------------------------------------- */ + +/* + * For various legacy reasons, Linux has a small cookie that's paired with + * a struct usb_device to identify an endpoint queue. Queue characteristics + * are defined by the endpoint's descriptor. This cookie is called a "pipe", + * an unsigned int encoded as: + * + * - direction: bit 7 (0 = Host-to-Device [Out], + * 1 = Device-to-Host [In] ... + * like endpoint bEndpointAddress) + * - device address: bits 8-14 ... bit positions known to uhci-hcd + * - endpoint: bits 15-18 ... bit positions known to uhci-hcd + * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt, + * 10 = control, 11 = bulk) + * + * Given the device address and endpoint descriptor, pipes are redundant. + */ + +/* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */ +/* (yet ... they're the values used by usbfs) */ +#define PIPE_ISOCHRONOUS 0 +#define PIPE_INTERRUPT 1 +#define PIPE_CONTROL 2 +#define PIPE_BULK 3 + +#define usb_pipein(pipe) ((pipe) & USB_DIR_IN) +#define usb_pipeout(pipe) (!usb_pipein(pipe)) + +#define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f) +#define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf) + +#define usb_pipetype(pipe) (((pipe) >> 30) & 3) +#define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS) +#define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT) +#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL) +#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK) + +static inline unsigned int __create_pipe(struct usb_device *dev, + unsigned int endpoint) +{ + return (dev->devnum << 8) | (endpoint << 15); +} + +/* Create various pipes... */ +#define usb_sndctrlpipe(dev, endpoint) \ + ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint)) +#define usb_rcvctrlpipe(dev, endpoint) \ + ((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) +#define usb_sndisocpipe(dev, endpoint) \ + ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint)) +#define usb_rcvisocpipe(dev, endpoint) \ + ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) +#define usb_sndbulkpipe(dev, endpoint) \ + ((PIPE_BULK << 30) | __create_pipe(dev, endpoint)) +#define usb_rcvbulkpipe(dev, endpoint) \ + ((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) +#define usb_sndintpipe(dev, endpoint) \ + ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint)) +#define usb_rcvintpipe(dev, endpoint) \ + ((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) + +static inline struct usb_host_endpoint * +usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe) +{ + struct usb_host_endpoint **eps; + eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out; + return eps[usb_pipeendpoint(pipe)]; +} + +/*-------------------------------------------------------------------------*/ + +static inline __u16 +usb_maxpacket(struct usb_device *udev, int pipe, int is_out) +{ + struct usb_host_endpoint *ep; + unsigned epnum = usb_pipeendpoint(pipe); + + if (is_out) { + WARN_ON(usb_pipein(pipe)); + ep = udev->ep_out[epnum]; + } else { + WARN_ON(usb_pipeout(pipe)); + ep = udev->ep_in[epnum]; + } + if (!ep) + return 0; + + /* NOTE: only 0x07ff bits are for packet size... */ + return usb_endpoint_maxp(&ep->desc); +} + +/* ----------------------------------------------------------------------- */ + +/* translate USB error codes to codes user space understands */ +static inline int usb_translate_errors(int error_code) +{ + switch (error_code) { + case 0: + case -ENOMEM: + case -ENODEV: + case -EOPNOTSUPP: + return error_code; + default: + return -EIO; + } +} + +/* Events from the usb core */ +#define USB_DEVICE_ADD 0x0001 +#define USB_DEVICE_REMOVE 0x0002 +#define USB_BUS_ADD 0x0003 +#define USB_BUS_REMOVE 0x0004 +extern void usb_register_notify(struct notifier_block *nb); +extern void usb_unregister_notify(struct notifier_block *nb); + +/* debugfs stuff */ +extern struct dentry *usb_debug_root; + +/* LED triggers */ +enum usb_led_event { + USB_LED_EVENT_HOST = 0, + USB_LED_EVENT_GADGET = 1, +}; + +#ifdef CONFIG_USB_LED_TRIG +extern void usb_led_activity(enum usb_led_event ev); +#else +static inline void usb_led_activity(enum usb_led_event ev) {} +#endif + +#endif /* __KERNEL__ */ + +#endif |