bdb64d7272
SuperSpeed USB has defined a new descriptor, called the Binary Device Object Store (BOS) Descriptor. It has also changed a bit the definition of SET_FEATURE and GET_STATUS requests to add USB3-specific details. This patch implements both changes to the Composite Gadget Framework. [ balbi@ti.com : slight changes to commit log fixed a compile error on ARM ] Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
385 lines
16 KiB
C
385 lines
16 KiB
C
/*
|
|
* composite.h -- framework for usb gadgets which are composite devices
|
|
*
|
|
* Copyright (C) 2006-2008 David Brownell
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef __LINUX_USB_COMPOSITE_H
|
|
#define __LINUX_USB_COMPOSITE_H
|
|
|
|
/*
|
|
* This framework is an optional layer on top of the USB Gadget interface,
|
|
* making it easier to build (a) Composite devices, supporting multiple
|
|
* functions within any single configuration, and (b) Multi-configuration
|
|
* devices, also supporting multiple functions but without necessarily
|
|
* having more than one function per configuration.
|
|
*
|
|
* Example: a device with a single configuration supporting both network
|
|
* link and mass storage functions is a composite device. Those functions
|
|
* might alternatively be packaged in individual configurations, but in
|
|
* the composite model the host can use both functions at the same time.
|
|
*/
|
|
|
|
#include <linux/usb/ch9.h>
|
|
#include <linux/usb/gadget.h>
|
|
|
|
/*
|
|
* USB function drivers should return USB_GADGET_DELAYED_STATUS if they
|
|
* wish to delay the data/status stages of the control transfer till they
|
|
* are ready. The control transfer will then be kept from completing till
|
|
* all the function drivers that requested for USB_GADGET_DELAYED_STAUS
|
|
* invoke usb_composite_setup_continue().
|
|
*/
|
|
#define USB_GADGET_DELAYED_STATUS 0x7fff /* Impossibly large value */
|
|
|
|
struct usb_configuration;
|
|
|
|
/**
|
|
* struct usb_function - describes one function of a configuration
|
|
* @name: For diagnostics, identifies the function.
|
|
* @strings: tables of strings, keyed by identifiers assigned during bind()
|
|
* and by language IDs provided in control requests
|
|
* @descriptors: Table of full (or low) speed descriptors, using interface and
|
|
* string identifiers assigned during @bind(). If this pointer is null,
|
|
* the function will not be available at full speed (or at low speed).
|
|
* @hs_descriptors: Table of high speed descriptors, using interface and
|
|
* string identifiers assigned during @bind(). If this pointer is null,
|
|
* the function will not be available at high speed.
|
|
* @ss_descriptors: Table of super speed descriptors, using interface and
|
|
* string identifiers assigned during @bind(). If this
|
|
* pointer is null after initiation, the function will not
|
|
* be available at super speed.
|
|
* @config: assigned when @usb_add_function() is called; this is the
|
|
* configuration with which this function is associated.
|
|
* @bind: Before the gadget can register, all of its functions bind() to the
|
|
* available resources including string and interface identifiers used
|
|
* in interface or class descriptors; endpoints; I/O buffers; and so on.
|
|
* @unbind: Reverses @bind; called as a side effect of unregistering the
|
|
* driver which added this function.
|
|
* @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may
|
|
* initialize usb_ep.driver data at this time (when it is used).
|
|
* Note that setting an interface to its current altsetting resets
|
|
* interface state, and that all interfaces have a disabled state.
|
|
* @get_alt: Returns the active altsetting. If this is not provided,
|
|
* then only altsetting zero is supported.
|
|
* @disable: (REQUIRED) Indicates the function should be disabled. Reasons
|
|
* include host resetting or reconfiguring the gadget, and disconnection.
|
|
* @setup: Used for interface-specific control requests.
|
|
* @suspend: Notifies functions when the host stops sending USB traffic.
|
|
* @resume: Notifies functions when the host restarts USB traffic.
|
|
* @get_status: Returns function status as a reply to
|
|
* GetStatus() request when the recepient is Interface.
|
|
* @func_suspend: callback to be called when
|
|
* SetFeature(FUNCTION_SUSPEND) is reseived
|
|
*
|
|
* A single USB function uses one or more interfaces, and should in most
|
|
* cases support operation at both full and high speeds. Each function is
|
|
* associated by @usb_add_function() with a one configuration; that function
|
|
* causes @bind() to be called so resources can be allocated as part of
|
|
* setting up a gadget driver. Those resources include endpoints, which
|
|
* should be allocated using @usb_ep_autoconfig().
|
|
*
|
|
* To support dual speed operation, a function driver provides descriptors
|
|
* for both high and full speed operation. Except in rare cases that don't
|
|
* involve bulk endpoints, each speed needs different endpoint descriptors.
|
|
*
|
|
* Function drivers choose their own strategies for managing instance data.
|
|
* The simplest strategy just declares it "static', which means the function
|
|
* can only be activated once. If the function needs to be exposed in more
|
|
* than one configuration at a given speed, it needs to support multiple
|
|
* usb_function structures (one for each configuration).
|
|
*
|
|
* A more complex strategy might encapsulate a @usb_function structure inside
|
|
* a driver-specific instance structure to allows multiple activations. An
|
|
* example of multiple activations might be a CDC ACM function that supports
|
|
* two or more distinct instances within the same configuration, providing
|
|
* several independent logical data links to a USB host.
|
|
*/
|
|
struct usb_function {
|
|
const char *name;
|
|
struct usb_gadget_strings **strings;
|
|
struct usb_descriptor_header **descriptors;
|
|
struct usb_descriptor_header **hs_descriptors;
|
|
struct usb_descriptor_header **ss_descriptors;
|
|
|
|
struct usb_configuration *config;
|
|
|
|
/* REVISIT: bind() functions can be marked __init, which
|
|
* makes trouble for section mismatch analysis. See if
|
|
* we can't restructure things to avoid mismatching.
|
|
* Related: unbind() may kfree() but bind() won't...
|
|
*/
|
|
|
|
/* configuration management: bind/unbind */
|
|
int (*bind)(struct usb_configuration *,
|
|
struct usb_function *);
|
|
void (*unbind)(struct usb_configuration *,
|
|
struct usb_function *);
|
|
|
|
/* runtime state management */
|
|
int (*set_alt)(struct usb_function *,
|
|
unsigned interface, unsigned alt);
|
|
int (*get_alt)(struct usb_function *,
|
|
unsigned interface);
|
|
void (*disable)(struct usb_function *);
|
|
int (*setup)(struct usb_function *,
|
|
const struct usb_ctrlrequest *);
|
|
void (*suspend)(struct usb_function *);
|
|
void (*resume)(struct usb_function *);
|
|
|
|
/* USB 3.0 additions */
|
|
int (*get_status)(struct usb_function *);
|
|
int (*func_suspend)(struct usb_function *,
|
|
u8 suspend_opt);
|
|
/* private: */
|
|
/* internals */
|
|
struct list_head list;
|
|
DECLARE_BITMAP(endpoints, 32);
|
|
};
|
|
|
|
int usb_add_function(struct usb_configuration *, struct usb_function *);
|
|
|
|
int usb_function_deactivate(struct usb_function *);
|
|
int usb_function_activate(struct usb_function *);
|
|
|
|
int usb_interface_id(struct usb_configuration *, struct usb_function *);
|
|
|
|
int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
|
|
struct usb_ep *_ep);
|
|
|
|
#define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */
|
|
|
|
/**
|
|
* struct usb_configuration - represents one gadget configuration
|
|
* @label: For diagnostics, describes the configuration.
|
|
* @strings: Tables of strings, keyed by identifiers assigned during @bind()
|
|
* and by language IDs provided in control requests.
|
|
* @descriptors: Table of descriptors preceding all function descriptors.
|
|
* Examples include OTG and vendor-specific descriptors.
|
|
* @unbind: Reverses @bind; called as a side effect of unregistering the
|
|
* driver which added this configuration.
|
|
* @setup: Used to delegate control requests that aren't handled by standard
|
|
* device infrastructure or directed at a specific interface.
|
|
* @bConfigurationValue: Copied into configuration descriptor.
|
|
* @iConfiguration: Copied into configuration descriptor.
|
|
* @bmAttributes: Copied into configuration descriptor.
|
|
* @bMaxPower: Copied into configuration descriptor.
|
|
* @cdev: assigned by @usb_add_config() before calling @bind(); this is
|
|
* the device associated with this configuration.
|
|
*
|
|
* Configurations are building blocks for gadget drivers structured around
|
|
* function drivers. Simple USB gadgets require only one function and one
|
|
* configuration, and handle dual-speed hardware by always providing the same
|
|
* functionality. Slightly more complex gadgets may have more than one
|
|
* single-function configuration at a given speed; or have configurations
|
|
* that only work at one speed.
|
|
*
|
|
* Composite devices are, by definition, ones with configurations which
|
|
* include more than one function.
|
|
*
|
|
* The lifecycle of a usb_configuration includes allocation, initialization
|
|
* of the fields described above, and calling @usb_add_config() to set up
|
|
* internal data and bind it to a specific device. The configuration's
|
|
* @bind() method is then used to initialize all the functions and then
|
|
* call @usb_add_function() for them.
|
|
*
|
|
* Those functions would normally be independent of each other, but that's
|
|
* not mandatory. CDC WMC devices are an example where functions often
|
|
* depend on other functions, with some functions subsidiary to others.
|
|
* Such interdependency may be managed in any way, so long as all of the
|
|
* descriptors complete by the time the composite driver returns from
|
|
* its bind() routine.
|
|
*/
|
|
struct usb_configuration {
|
|
const char *label;
|
|
struct usb_gadget_strings **strings;
|
|
const struct usb_descriptor_header **descriptors;
|
|
|
|
/* REVISIT: bind() functions can be marked __init, which
|
|
* makes trouble for section mismatch analysis. See if
|
|
* we can't restructure things to avoid mismatching...
|
|
*/
|
|
|
|
/* configuration management: unbind/setup */
|
|
void (*unbind)(struct usb_configuration *);
|
|
int (*setup)(struct usb_configuration *,
|
|
const struct usb_ctrlrequest *);
|
|
|
|
/* fields in the config descriptor */
|
|
u8 bConfigurationValue;
|
|
u8 iConfiguration;
|
|
u8 bmAttributes;
|
|
u8 bMaxPower;
|
|
|
|
struct usb_composite_dev *cdev;
|
|
|
|
/* private: */
|
|
/* internals */
|
|
struct list_head list;
|
|
struct list_head functions;
|
|
u8 next_interface_id;
|
|
unsigned superspeed:1;
|
|
unsigned highspeed:1;
|
|
unsigned fullspeed:1;
|
|
struct usb_function *interface[MAX_CONFIG_INTERFACES];
|
|
};
|
|
|
|
int usb_add_config(struct usb_composite_dev *,
|
|
struct usb_configuration *,
|
|
int (*)(struct usb_configuration *));
|
|
|
|
/**
|
|
* struct usb_composite_driver - groups configurations into a gadget
|
|
* @name: For diagnostics, identifies the driver.
|
|
* @iProduct: Used as iProduct override if @dev->iProduct is not set.
|
|
* If NULL value of @name is taken.
|
|
* @iManufacturer: Used as iManufacturer override if @dev->iManufacturer is
|
|
* not set. If NULL a default "<system> <release> with <udc>" value
|
|
* will be used.
|
|
* @dev: Template descriptor for the device, including default device
|
|
* identifiers.
|
|
* @strings: tables of strings, keyed by identifiers assigned during bind()
|
|
* and language IDs provided in control requests
|
|
* @max_speed: Highest speed the driver supports.
|
|
* @needs_serial: set to 1 if the gadget needs userspace to provide
|
|
* a serial number. If one is not provided, warning will be printed.
|
|
* @unbind: Reverses bind; called as a side effect of unregistering
|
|
* this driver.
|
|
* @disconnect: optional driver disconnect method
|
|
* @suspend: Notifies when the host stops sending USB traffic,
|
|
* after function notifications
|
|
* @resume: Notifies configuration when the host restarts USB traffic,
|
|
* before function notifications
|
|
*
|
|
* Devices default to reporting self powered operation. Devices which rely
|
|
* on bus powered operation should report this in their @bind() method.
|
|
*
|
|
* Before returning from bind, various fields in the template descriptor
|
|
* may be overridden. These include the idVendor/idProduct/bcdDevice values
|
|
* normally to bind the appropriate host side driver, and the three strings
|
|
* (iManufacturer, iProduct, iSerialNumber) normally used to provide user
|
|
* meaningful device identifiers. (The strings will not be defined unless
|
|
* they are defined in @dev and @strings.) The correct ep0 maxpacket size
|
|
* is also reported, as defined by the underlying controller driver.
|
|
*/
|
|
struct usb_composite_driver {
|
|
const char *name;
|
|
const char *iProduct;
|
|
const char *iManufacturer;
|
|
const struct usb_device_descriptor *dev;
|
|
struct usb_gadget_strings **strings;
|
|
enum usb_device_speed max_speed;
|
|
unsigned needs_serial:1;
|
|
|
|
int (*unbind)(struct usb_composite_dev *);
|
|
|
|
void (*disconnect)(struct usb_composite_dev *);
|
|
|
|
/* global suspend hooks */
|
|
void (*suspend)(struct usb_composite_dev *);
|
|
void (*resume)(struct usb_composite_dev *);
|
|
};
|
|
|
|
extern int usb_composite_probe(struct usb_composite_driver *driver,
|
|
int (*bind)(struct usb_composite_dev *cdev));
|
|
extern void usb_composite_unregister(struct usb_composite_driver *driver);
|
|
extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
|
|
|
|
|
|
/**
|
|
* struct usb_composite_device - represents one composite usb gadget
|
|
* @gadget: read-only, abstracts the gadget's usb peripheral controller
|
|
* @req: used for control responses; buffer is pre-allocated
|
|
* @bufsiz: size of buffer pre-allocated in @req
|
|
* @config: the currently active configuration
|
|
*
|
|
* One of these devices is allocated and initialized before the
|
|
* associated device driver's bind() is called.
|
|
*
|
|
* OPEN ISSUE: it appears that some WUSB devices will need to be
|
|
* built by combining a normal (wired) gadget with a wireless one.
|
|
* This revision of the gadget framework should probably try to make
|
|
* sure doing that won't hurt too much.
|
|
*
|
|
* One notion for how to handle Wireless USB devices involves:
|
|
* (a) a second gadget here, discovery mechanism TBD, but likely
|
|
* needing separate "register/unregister WUSB gadget" calls;
|
|
* (b) updates to usb_gadget to include flags "is it wireless",
|
|
* "is it wired", plus (presumably in a wrapper structure)
|
|
* bandgroup and PHY info;
|
|
* (c) presumably a wireless_ep wrapping a usb_ep, and reporting
|
|
* wireless-specific parameters like maxburst and maxsequence;
|
|
* (d) configurations that are specific to wireless links;
|
|
* (e) function drivers that understand wireless configs and will
|
|
* support wireless for (additional) function instances;
|
|
* (f) a function to support association setup (like CBAF), not
|
|
* necessarily requiring a wireless adapter;
|
|
* (g) composite device setup that can create one or more wireless
|
|
* configs, including appropriate association setup support;
|
|
* (h) more, TBD.
|
|
*/
|
|
struct usb_composite_dev {
|
|
struct usb_gadget *gadget;
|
|
struct usb_request *req;
|
|
unsigned bufsiz;
|
|
|
|
struct usb_configuration *config;
|
|
|
|
/* private: */
|
|
/* internals */
|
|
unsigned int suspended:1;
|
|
struct usb_device_descriptor desc;
|
|
struct list_head configs;
|
|
struct usb_composite_driver *driver;
|
|
u8 next_string_id;
|
|
u8 manufacturer_override;
|
|
u8 product_override;
|
|
u8 serial_override;
|
|
|
|
/* the gadget driver won't enable the data pullup
|
|
* while the deactivation count is nonzero.
|
|
*/
|
|
unsigned deactivations;
|
|
|
|
/* the composite driver won't complete the control transfer's
|
|
* data/status stages till delayed_status is zero.
|
|
*/
|
|
int delayed_status;
|
|
|
|
/* protects deactivations and delayed_status counts*/
|
|
spinlock_t lock;
|
|
};
|
|
|
|
extern int usb_string_id(struct usb_composite_dev *c);
|
|
extern int usb_string_ids_tab(struct usb_composite_dev *c,
|
|
struct usb_string *str);
|
|
extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n);
|
|
|
|
|
|
/* messaging utils */
|
|
#define DBG(d, fmt, args...) \
|
|
dev_dbg(&(d)->gadget->dev , fmt , ## args)
|
|
#define VDBG(d, fmt, args...) \
|
|
dev_vdbg(&(d)->gadget->dev , fmt , ## args)
|
|
#define ERROR(d, fmt, args...) \
|
|
dev_err(&(d)->gadget->dev , fmt , ## args)
|
|
#define WARNING(d, fmt, args...) \
|
|
dev_warn(&(d)->gadget->dev , fmt , ## args)
|
|
#define INFO(d, fmt, args...) \
|
|
dev_info(&(d)->gadget->dev , fmt , ## args)
|
|
|
|
#endif /* __LINUX_USB_COMPOSITE_H */
|