| #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 */ |
| |
| 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; |
| |
| /* For SS devices */ |
| /** |
| * struct usb_host_ss_ep_comp - Valid for SuperSpeed devices only |
| * @desc: endpoint companion descriptor, wMaxPacketSize in native byteorder |
| * @extra: descriptors following this endpoint companion descriptor |
| * @extralen: how many bytes of "extra" are valid |
| */ |
| struct usb_host_ss_ep_comp { |
| struct usb_ss_ep_comp_descriptor desc; |
| unsigned char *extra; /* Extra descriptors */ |
| int extralen; |
| }; |
| |
| /** |
| * struct usb_host_endpoint - host-side endpoint descriptor and queue |
| * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder |
| * @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 |
| * @ss_ep_comp: companion descriptor information for this endpoint |
| * @extra: descriptors following this endpoint in the configuration |
| * @extralen: how many bytes of "extra" are valid |
| * @enabled: URBs may be submitted to this 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 list_head urb_list; |
| void *hcpriv; |
| struct ep_device *ep_dev; /* For sysfs info */ |
| struct usb_host_ss_ep_comp *ss_ep_comp; /* For SS devices */ |
| |
| unsigned char *extra; /* Extra descriptors */ |
| int extralen; |
| int enabled; |
| }; |
| |
| /* host-side wrapper for one interface setting's parsed descriptors */ |
| struct usb_host_interface { |
| struct usb_interface_descriptor desc; |
| |
| /* array of desc.bNumEndpoint endpoints associated with this |
| * interface setting. these will be in no particular order. |
| */ |
| struct usb_host_endpoint *endpoint; |
| |
| char *string; /* iInterface string, if present */ |
| unsigned char *extra; /* Extra descriptors */ |
| int extralen; |
| }; |
| |
| 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. |
| * @reset_running: set to 1 if the interface is currently running a |
| * queued reset so that usb_cancel_queued_reset() doesn't try to |
| * remove from the workqueue when running inside the worker |
| * thread. See __usb_queue_reset_device(). |
| * |
| * 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 reset_running:1; |
| 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) |
| #define interface_to_usbdev(intf) \ |
| container_of(intf->dev.parent, struct usb_device, 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); |
| |
| /* this maximum is arbitrary */ |
| #define USB_MAXINTERFACES 32 |
| #define USB_MAXIADS USB_MAXINTERFACES/2 |
| |
| /** |
| * 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; |
| }; |
| |
| 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 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 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 */ |
| |
| 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 */ |
| |
| #ifdef CONFIG_USB_DEVICEFS |
| struct dentry *usbfs_dentry; /* usbfs dentry entry for the bus */ |
| #endif |
| |
| #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 |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| /* This is arbitrary. |
| * From USB 2.0 spec Table 11-13, offset 7, a hub can |
| * have up to 255 ports. The most yet reported is 10. |
| * |
| * Current Wireless USB host hardware (Intel i1480 for example) allows |
| * up to 22 devices to connect. Upcoming hardware might raise that |
| * limit. Because the arrays need to add a bit for hub status data, we |
| * do 31, so plus one evens out to four bytes. |
| */ |
| #define USB_MAXCHILDREN (31) |
| |
| struct usb_tt; |
| |
| /** |
| * 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 |
| * @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 |
| * @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 |
| * @usb_classdev: USB class device that was created for usbfs device |
| * access from userspace |
| * @usbfs_dentry: usbfs dentry entry for the device |
| * @maxchild: number of ports if hub |
| * @children: child devices - USB devices that are attached to this hub |
| * @quirks: quirks of the whole device |
| * @urbnum: number of URBs submitted for the whole device |
| * @active_duration: total time device is not suspended |
| * @last_busy: time of last use |
| * @autosuspend_delay: in jiffies |
| * @connect_time: time device was first connected |
| * @do_remote_wakeup: remote wakeup should be enabled |
| * @reset_resume: needs reset instead of resume |
| * @autosuspend_disabled: autosuspend disabled by the user |
| * @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 |
| * |
| * 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_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; |
| int string_langid; |
| |
| /* static strings from the device */ |
| char *product; |
| char *manufacturer; |
| char *serial; |
| |
| struct list_head filelist; |
| #ifdef CONFIG_USB_DEVICE_CLASS |
| struct device *usb_classdev; |
| #endif |
| #ifdef CONFIG_USB_DEVICEFS |
| struct dentry *usbfs_dentry; |
| #endif |
| |
| int maxchild; |
| struct usb_device *children[USB_MAXCHILDREN]; |
| |
| u32 quirks; |
| atomic_t urbnum; |
| |
| unsigned long active_duration; |
| |
| #ifdef CONFIG_PM |
| unsigned long last_busy; |
| int autosuspend_delay; |
| unsigned long connect_time; |
| |
| unsigned do_remote_wakeup:1; |
| unsigned reset_resume:1; |
| unsigned autosuspend_disabled:1; |
| #endif |
| struct wusb_dev *wusb_dev; |
| int slot_id; |
| }; |
| #define to_usb_device(d) container_of(d, struct usb_device, dev) |
| |
| extern struct usb_device *usb_get_dev(struct usb_device *dev); |
| extern void usb_put_dev(struct usb_device *dev); |
| |
| /* USB device locking */ |
| #define usb_lock_device(udev) down(&(udev)->dev.sem) |
| #define usb_unlock_device(udev) up(&(udev)->dev.sem) |
| #define usb_trylock_device(udev) down_trylock(&(udev)->dev.sem) |
| 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); |
| |
| extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id); |
| |
| /* USB autosuspend and autoresume */ |
| #ifdef CONFIG_USB_SUSPEND |
| extern int usb_enable_autosuspend(struct usb_device *udev); |
| extern int 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) |
| { |
| udev->last_busy = jiffies; |
| } |
| |
| #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 |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* for drivers using iso endpoints */ |
| extern int usb_get_current_frame_number(struct usb_device *usb_dev); |
| |
| /* 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 |
| * |
| * Returns true (nonzero) iff the interface is claimed, else false (zero). |
| * 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 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); |
| |
| |
| /** |
| * 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"? |
| * |
| * Returns length of the string (> 0) or negative if size was too small. |
| * |
| * 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 identifers; |
| * 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_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_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) |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| /* 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, |
| struct device_driver *driver, |
| const char *buf, size_t count); |
| |
| /** |
| * 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 occured, 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. |
| * @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. |
| * @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. |
| * @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. |
| * |
| * 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 (*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 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, mode_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 *); |
| static inline int usb_register(struct usb_driver *driver) |
| { |
| return usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME); |
| } |
| extern void usb_deregister(struct usb_driver *); |
| |
| 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, urb->start_frame |
| * ignored */ |
| #define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */ |
| #define URB_NO_SETUP_DMA_MAP 0x0008 /* urb->setup_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 */ |
| |
| #define URB_DIR_IN 0x0200 /* Transfer from device to host */ |
| #define URB_DIR_OUT 0 |
| #define URB_DIR_MASK URB_DIR_IN |
| |
| 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; |
| unsigned int poisoned:1; |
| }; |
| |
| static inline void init_usb_anchor(struct usb_anchor *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. |
| * @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 |
| * @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: For control transfers with URB_NO_SETUP_DMA_MAP set, the |
| * device driver has provided this DMA address for the setup packet. |
| * The host controller driver should use this in preference to |
| * setup_packet, but the HCD may chose to ignore the address if it must |
| * copy the setup packet into internal structures. Therefore, setup_packet |
| * must always 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 ones. |
| * @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_xxx_DMA_MAP transfer flags, |
| * which tell the host controller driver that no such mapping is needed since |
| * the device driver is DMA-aware. For example, a device driver might |
| * allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map(). |
| * When these transfer flags are provided, host controller drivers will |
| * attempt to use the dma addresses found in the transfer_dma and/or |
| * setup_dma fields 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 setup_packet. The setup_packet and |
| * transfer_buffer may each be mapped for DMA or not, independently of |
| * the other. The transfer_flags bits URB_NO_TRANSFER_DMA_MAP and |
| * URB_NO_SETUP_DMA_MAP indicate which buffers have already been mapped. |
| * URB_NO_SETUP_DMA_MAP is ignored for non-control URBs. |
| * |
| * 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.) |
| * |
| * Isochronous URBs normally use the URB_ISO_ASAP transfer flag, telling |
| * the host controller to schedule the transfer as soon as bandwidth |
| * utilization allows, and then set start_frame to reflect the actual frame |
| * selected during submission. Otherwise drivers must specify the start_frame |
| * and handle the case where the transfer can't begin then. However, drivers |
| * won't know how bandwidth is currently allocated, and while they can |
| * find the current frame using usb_get_current_frame_number () they can't |
| * know the range for that frame number. (Ranges for frame counter values |
| * are HC-specific, and can go from 256 to 65536 frames from "now".) |
| * |
| * 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 */ |
| 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 usb_sg_request *sg; /* (in) scatter gather buffer list */ |
| 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 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). |
| */ |
| 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) |
| 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_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_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); |
| |
| /** |
| * usb_urb_dir_in - check if an URB describes an IN transfer |
| * @urb: URB to be checked |
| * |
| * Returns 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 |
| * |
| * Returns 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_buffer_alloc(struct usb_device *dev, size_t size, |
| gfp_t mem_flags, dma_addr_t *dma); |
| void usb_buffer_free(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); |
| |
| /* |
| * 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; |
| struct scatterlist *sg; |
| int nents; |
| |
| 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 __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 le16_to_cpu(ep->desc.wMaxPacketSize); |
| } |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| /* 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); |
| |
| #ifdef DEBUG |
| #define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , \ |
| __FILE__ , ## arg) |
| #else |
| #define dbg(format, arg...) do {} while (0) |
| #endif |
| |
| #define err(format, arg...) printk(KERN_ERR KBUILD_MODNAME ": " \ |
| format "\n" , ## arg) |
| |
| /* debugfs stuff */ |
| extern struct dentry *usb_debug_root; |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif |