/* * composite.c - infrastructure for Composite USB Gadgets * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* #define VERBOSE_DEBUG */ #include #include #include #include #include /* * The code in this file is utility code, used to build a gadget driver * from one or more "function" drivers, one or more "configuration" * objects, and a "usb_composite_driver" by gluing them together along * with the relevant device-wide data. */ /* big enough to hold our biggest descriptor */ #define USB_BUFSIZ 512 static struct usb_composite_driver *composite; /* Some systems will need runtime overrides for the product identifers * published in the device descriptor, either numbers or strings or both. * String parameters are in UTF-8 (superset of ASCII's 7 bit characters). */ static ushort idVendor; module_param(idVendor, ushort, 0); MODULE_PARM_DESC(idVendor, "USB Vendor ID"); static ushort idProduct; module_param(idProduct, ushort, 0); MODULE_PARM_DESC(idProduct, "USB Product ID"); static ushort bcdDevice; module_param(bcdDevice, ushort, 0); MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); static char *iManufacturer; module_param(iManufacturer, charp, 0); MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); static char *iProduct; module_param(iProduct, charp, 0); MODULE_PARM_DESC(iProduct, "USB Product string"); static char *iSerialNumber; module_param(iSerialNumber, charp, 0); MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); /*-------------------------------------------------------------------------*/ /** * usb_add_function() - add a function to a configuration * @config: the configuration * @function: the function being added * Context: single threaded during gadget setup * * After initialization, each configuration must have one or more * functions added to it. Adding a function involves calling its @bind() * method to allocate resources such as interface and string identifiers * and endpoints. * * This function returns the value of the function's bind(), which is * zero for success else a negative errno value. */ int __init usb_add_function(struct usb_configuration *config, struct usb_function *function) { int value = -EINVAL; DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n", function->name, function, config->label, config); if (!function->set_alt || !function->disable) goto done; function->config = config; list_add_tail(&function->list, &config->functions); /* REVISIT *require* function->bind? */ if (function->bind) { value = function->bind(config, function); if (value < 0) { list_del(&function->list); function->config = NULL; } } else value = 0; /* We allow configurations that don't work at both speeds. * If we run into a lowspeed Linux system, treat it the same * as full speed ... it's the function drivers that will need * to avoid bulk and ISO transfers. */ if (!config->fullspeed && function->descriptors) config->fullspeed = true; if (!config->highspeed && function->hs_descriptors) config->highspeed = true; done: if (value) DBG(config->cdev, "adding '%s'/%p --> %d\n", function->name, function, value); return value; } /** * usb_function_deactivate - prevent function and gadget enumeration * @function: the function that isn't yet ready to respond * * Blocks response of the gadget driver to host enumeration by * preventing the data line pullup from being activated. This is * normally called during @bind() processing to change from the * initial "ready to respond" state, or when a required resource * becomes available. * * For example, drivers that serve as a passthrough to a userspace * daemon can block enumeration unless that daemon (such as an OBEX, * MTP, or print server) is ready to handle host requests. * * Not all systems support software control of their USB peripheral * data pullups. * * Returns zero on success, else negative errno. */ int usb_function_deactivate(struct usb_function *function) { struct usb_composite_dev *cdev = function->config->cdev; unsigned long flags; int status = 0; spin_lock_irqsave(&cdev->lock, flags); if (cdev->deactivations == 0) status = usb_gadget_disconnect(cdev->gadget); if (status == 0) cdev->deactivations++; spin_unlock_irqrestore(&cdev->lock, flags); return status; } /** * usb_function_activate - allow function and gadget enumeration * @function: function on which usb_function_activate() was called * * Reverses effect of usb_function_deactivate(). If no more functions * are delaying their activation, the gadget driver will respond to * host enumeration procedures. * * Returns zero on success, else negative errno. */ int usb_function_activate(struct usb_function *function) { struct usb_composite_dev *cdev = function->config->cdev; int status = 0; spin_lock(&cdev->lock); if (WARN_ON(cdev->deactivations == 0)) status = -EINVAL; else { cdev->deactivations--; if (cdev->deactivations == 0) status = usb_gadget_connect(cdev->gadget); } spin_unlock(&cdev->lock); return status; } /** * usb_interface_id() - allocate an unused interface ID * @config: configuration associated with the interface * @function: function handling the interface * Context: single threaded during gadget setup * * usb_interface_id() is called from usb_function.bind() callbacks to * allocate new interface IDs. The function driver will then store that * ID in interface, association, CDC union, and other descriptors. It * will also handle any control requests targetted at that interface, * particularly changing its altsetting via set_alt(). There may * also be class-specific or vendor-specific requests to handle. * * All interface identifier should be allocated using this routine, to * ensure that for example different functions don't wrongly assign * different meanings to the same identifier. Note that since interface * identifers are configuration-specific, functions used in more than * one configuration (or more than once in a given configuration) need * multiple versions of the relevant descriptors. * * Returns the interface ID which was allocated; or -ENODEV if no * more interface IDs can be allocated. */ int __init usb_interface_id(struct usb_configuration *config, struct usb_function *function) { unsigned id = config->next_interface_id; if (id < MAX_CONFIG_INTERFACES) { config->interface[id] = function; config->next_interface_id = id + 1; return id; } return -ENODEV; } static int config_buf(struct usb_configuration *config, enum usb_device_speed speed, void *buf, u8 type) { struct usb_config_descriptor *c = buf; void *next = buf + USB_DT_CONFIG_SIZE; int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; struct usb_function *f; int status; /* write the config descriptor */ c = buf; c->bLength = USB_DT_CONFIG_SIZE; c->bDescriptorType = type; /* wTotalLength is written later */ c->bNumInterfaces = config->next_interface_id; c->bConfigurationValue = config->bConfigurationValue; c->iConfiguration = config->iConfiguration; c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2); /* There may be e.g. OTG descriptors */ if (config->descriptors) { status = usb_descriptor_fillbuf(next, len, config->descriptors); if (status < 0) return status; len -= status; next += status; } /* add each function's descriptors */ list_for_each_entry(f, &config->functions, list) { struct usb_descriptor_header **descriptors; if (speed == USB_SPEED_HIGH) descriptors = f->hs_descriptors; else descriptors = f->descriptors; if (!descriptors) continue; status = usb_descriptor_fillbuf(next, len, (const struct usb_descriptor_header **) descriptors); if (status < 0) return status; len -= status; next += status; } len = next - buf; c->wTotalLength = cpu_to_le16(len); return len; } static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) { struct usb_gadget *gadget = cdev->gadget; struct usb_configuration *c; u8 type = w_value >> 8; enum usb_device_speed speed = USB_SPEED_UNKNOWN; if (gadget_is_dualspeed(gadget)) { int hs = 0; if (gadget->speed == USB_SPEED_HIGH) hs = 1; if (type == USB_DT_OTHER_SPEED_CONFIG) hs = !hs; if (hs) speed = USB_SPEED_HIGH; } /* This is a lookup by config *INDEX* */ w_value &= 0xff; list_for_each_entry(c, &cdev->configs, list) { /* ignore configs that won't work at this speed */ if (speed == USB_SPEED_HIGH) { if (!c->highspeed) continue; } else { if (!c->fullspeed) continue; } if (w_value == 0) return config_buf(c, speed, cdev->req->buf, type); w_value--; } return -EINVAL; } static int count_configs(struct usb_composite_dev *cdev, unsigned type) { struct usb_gadget *gadget = cdev->gadget; struct usb_configuration *c; unsigned count = 0; int hs = 0; if (gadget_is_dualspeed(gadget)) { if (gadget->speed == USB_SPEED_HIGH) hs = 1; if (type == USB_DT_DEVICE_QUALIFIER) hs = !hs; } list_for_each_entry(c, &cdev->configs, list) { /* ignore configs that won't work at this speed */ if (hs) { if (!c->highspeed) continue; } else { if (!c->fullspeed) continue; } count++; } return count; } static void device_qual(struct usb_composite_dev *cdev) { struct usb_qualifier_descriptor *qual = cdev->req->buf; qual->bLength = sizeof(*qual); qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; /* POLICY: same bcdUSB and device type info at both speeds */ qual->bcdUSB = cdev->desc.bcdUSB; qual->bDeviceClass = cdev->desc.bDeviceClass; qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; /* ASSUME same EP0 fifo size at both speeds */ qual->bMaxPacketSize0 = cdev->desc.bMaxPacketSize0; qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); qual->bRESERVED = 0; } /*-------------------------------------------------------------------------*/ static void reset_config(struct usb_composite_dev *cdev) { struct usb_function *f; DBG(cdev, "reset config\n"); list_for_each_entry(f, &cdev->config->functions, list) { if (f->disable) f->disable(f); } cdev->config = NULL; } static int set_config(struct usb_composite_dev *cdev, const struct usb_ctrlrequest *ctrl, unsigned number) { struct usb_gadget *gadget = cdev->gadget; struct usb_configuration *c = NULL; int result = -EINVAL; unsigned power = gadget_is_otg(gadget) ? 8 : 100; int tmp; if (cdev->config) reset_config(cdev); if (number) { list_for_each_entry(c, &cdev->configs, list) { if (c->bConfigurationValue == number) { result = 0; break; } } if (result < 0) goto done; } else result = 0; INFO(cdev, "%s speed config #%d: %s\n", ({ char *speed; switch (gadget->speed) { case USB_SPEED_LOW: speed = "low"; break; case USB_SPEED_FULL: speed = "full"; break; case USB_SPEED_HIGH: speed = "high"; break; default: speed = "?"; break; } ; speed; }), number, c ? c->label : "unconfigured"); if (!c) goto done; cdev->config = c; /* Initialize all interfaces by setting them to altsetting zero. */ for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) { struct usb_function *f = c->interface[tmp]; if (!f) break; result = f->set_alt(f, tmp, 0); if (result < 0) { DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n", tmp, f->name, f, result); reset_config(cdev); goto done; } } /* when we return, be sure our power usage is valid */ power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; done: usb_gadget_vbus_draw(gadget, power); return result; } /** * usb_add_config() - add a configuration to a device. * @cdev: wraps the USB gadget * @config: the configuration, with bConfigurationValue assigned * Context: single threaded during gadget setup * * One of the main tasks of a composite driver's bind() routine is to * add each of the configurations it supports, using this routine. * * This function returns the value of the configuration's bind(), which * is zero for success else a negative errno value. Binding configurations * assigns global resources including string IDs, and per-configuration * resources such as interface IDs and endpoints. */ int __init usb_add_config(struct usb_composite_dev *cdev, struct usb_configuration *config) { int status = -EINVAL; struct usb_configuration *c; DBG(cdev, "adding config #%u '%s'/%p\n", config->bConfigurationValue, config->label, config); if (!config->bConfigurationValue || !config->bind) goto done; /* Prevent duplicate configuration identifiers */ list_for_each_entry(c, &cdev->configs, list) { if (c->bConfigurationValue == config->bConfigurationValue) { status = -EBUSY; goto done; } } config->cdev = cdev; list_add_tail(&config->list, &cdev->configs); INIT_LIST_HEAD(&config->functions); config->next_interface_id = 0; status = config->bind(config); if (status < 0) { list_del(&config->list); config->cdev = NULL; } else { unsigned i; DBG(cdev, "cfg %d/%p speeds:%s%s\n", config->bConfigurationValue, config, config->highspeed ? " high" : "", config->fullspeed ? (gadget_is_dualspeed(cdev->gadget) ? " full" : " full/low") : ""); for (i = 0; i < MAX_CONFIG_INTERFACES; i++) { struct usb_function *f = config->interface[i]; if (!f) continue; DBG(cdev, " interface %d = %s/%p\n", i, f->name, f); } } /* set_alt(), or next config->bind(), sets up * ep->driver_data as needed. */ usb_ep_autoconfig_reset(cdev->gadget); done: if (status) DBG(cdev, "added config '%s'/%u --> %d\n", config->label, config->bConfigurationValue, status); return status; } /*-------------------------------------------------------------------------*/ /* We support strings in multiple languages ... string descriptor zero * says which languages are supported. The typical case will be that * only one language (probably English) is used, with I18N handled on * the host side. */ static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) { const struct usb_gadget_strings *s; u16 language; __le16 *tmp; while (*sp) { s = *sp; language = cpu_to_le16(s->language); for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { if (*tmp == language) goto repeat; } *tmp++ = language; repeat: sp++; } } static int lookup_string( struct usb_gadget_strings **sp, void *buf, u16 language, int id ) { struct usb_gadget_strings *s; int value; while (*sp) { s = *sp++; if (s->language != language) continue; value = usb_gadget_get_string(s, id, buf); if (value > 0) return value; } return -EINVAL; } static int get_string(struct usb_composite_dev *cdev, void *buf, u16 language, int id) { struct usb_configuration *c; struct usb_function *f; int len; /* Yes, not only is USB's I18N support probably more than most * folk will ever care about ... also, it's all supported here. * (Except for UTF8 support for Unicode's "Astral Planes".) */ /* 0 == report all available language codes */ if (id == 0) { struct usb_string_descriptor *s = buf; struct usb_gadget_strings **sp; memset(s, 0, 256); s->bDescriptorType = USB_DT_STRING; sp = composite->strings; if (sp) collect_langs(sp, s->wData); list_for_each_entry(c, &cdev->configs, list) { sp = c->strings; if (sp) collect_langs(sp, s->wData); list_for_each_entry(f, &c->functions, list) { sp = f->strings; if (sp) collect_langs(sp, s->wData); } } for (len = 0; len <= 126 && s->wData[len]; len++) continue; if (!len) return -EINVAL; s->bLength = 2 * (len + 1); return s->bLength; } /* Otherwise, look up and return a specified string. String IDs * are device-scoped, so we look up each string table we're told * about. These lookups are infrequent; simpler-is-better here. */ if (composite->strings) { len = lookup_string(composite->strings, buf, language, id); if (len > 0) return len; } list_for_each_entry(c, &cdev->configs, list) { if (c->strings) { len = lookup_string(c->strings, buf, language, id); if (len > 0) return len; } list_for_each_entry(f, &c->functions, list) { if (!f->strings) continue; len = lookup_string(f->strings, buf, language, id); if (len > 0) return len; } } return -EINVAL; } /** * usb_string_id() - allocate an unused string ID * @cdev: the device whose string descriptor IDs are being allocated * Context: single threaded during gadget setup * * @usb_string_id() is called from bind() callbacks to allocate * string IDs. Drivers for functions, configurations, or gadgets will * then store that ID in the appropriate descriptors and string table. * * All string identifier should be allocated using this routine, to * ensure that for example different functions don't wrongly assign * different meanings to the same identifier. */ int __init usb_string_id(struct usb_composite_dev *cdev) { if (cdev->next_string_id < 254) { /* string id 0 is reserved */ cdev->next_string_id++; return cdev->next_string_id; } return -ENODEV; } /*-------------------------------------------------------------------------*/ static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) { if (req->status || req->actual != req->length) DBG((struct usb_composite_dev *) ep->driver_data, "setup complete --> %d, %d/%d\n", req->status, req->actual, req->length); } /* * The setup() callback implements all the ep0 functionality that's * not handled lower down, in hardware or the hardware driver(like * device and endpoint feature flags, and their status). It's all * housekeeping for the gadget function we're implementing. Most of * the work is in config and function specific setup. */ static int composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) { struct usb_composite_dev *cdev = get_gadget_data(gadget); struct usb_request *req = cdev->req; int value = -EOPNOTSUPP; #if defined(__IFX_USB_GADGET__) && defined(__NOSWAPINCTRL__) u16 w_index = (ctrl->wIndex); u8 intf = w_index & 0xFF; u16 w_value = (ctrl->wValue); u16 w_length = (ctrl->wLength); #else u16 w_index = le16_to_cpu(ctrl->wIndex); u8 intf = w_index & 0xFF; u16 w_value = le16_to_cpu(ctrl->wValue); u16 w_length = le16_to_cpu(ctrl->wLength); #endif struct usb_function *f = NULL; /* partial re-init of the response message; the function or the * gadget might need to intercept e.g. a control-OUT completion * when we delegate to it. */ req->zero = 0; req->complete = composite_setup_complete; req->length = USB_BUFSIZ; gadget->ep0->driver_data = cdev; switch (ctrl->bRequest) { /* we handle all standard USB descriptors */ case USB_REQ_GET_DESCRIPTOR: if (ctrl->bRequestType != USB_DIR_IN) goto unknown; switch (w_value >> 8) { case USB_DT_DEVICE: cdev->desc.bNumConfigurations = count_configs(cdev, USB_DT_DEVICE); value = min(w_length, (u16) sizeof cdev->desc); memcpy(req->buf, &cdev->desc, value); break; case USB_DT_DEVICE_QUALIFIER: if (!gadget_is_dualspeed(gadget)) break; device_qual(cdev); value = min_t(int, w_length, sizeof(struct usb_qualifier_descriptor)); break; case USB_DT_OTHER_SPEED_CONFIG: if (!gadget_is_dualspeed(gadget)) break; /* FALLTHROUGH */ case USB_DT_CONFIG: value = config_desc(cdev, w_value); if (value >= 0) value = min(w_length, (u16) value); break; case USB_DT_STRING: value = get_string(cdev, req->buf, w_index, w_value & 0xff); if (value >= 0) value = min(w_length, (u16) value); break; } break; /* any number of configs can work */ case USB_REQ_SET_CONFIGURATION: if (ctrl->bRequestType != 0) goto unknown; if (gadget_is_otg(gadget)) { if (gadget->a_hnp_support) DBG(cdev, "HNP available\n"); else if (gadget->a_alt_hnp_support) DBG(cdev, "HNP on another port\n"); else VDBG(cdev, "HNP inactive\n"); } spin_lock(&cdev->lock); value = set_config(cdev, ctrl, w_value); spin_unlock(&cdev->lock); break; case USB_REQ_GET_CONFIGURATION: if (ctrl->bRequestType != USB_DIR_IN) goto unknown; if (cdev->config) *(u8 *)req->buf = cdev->config->bConfigurationValue; else *(u8 *)req->buf = 0; value = min(w_length, (u16) 1); break; /* function drivers must handle get/set altsetting; if there's * no get() method, we know only altsetting zero works. */ case USB_REQ_SET_INTERFACE: if (ctrl->bRequestType != USB_RECIP_INTERFACE) goto unknown; if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) break; f = cdev->config->interface[intf]; if (!f) break; if (w_value && !f->set_alt) break; value = f->set_alt(f, w_index, w_value); break; case USB_REQ_GET_INTERFACE: if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) goto unknown; if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) break; f = cdev->config->interface[intf]; if (!f) break; /* lots of interfaces only need altsetting zero... */ value = f->get_alt ? f->get_alt(f, w_index) : 0; if (value < 0) break; *((u8 *)req->buf) = value; value = min(w_length, (u16) 1); break; default: unknown: VDBG(cdev, "non-core control req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); /* functions always handle their interfaces ... punt other * recipients (endpoint, other, WUSB, ...) to the current * configuration code. * * REVISIT it could make sense to let the composite device * take such requests too, if that's ever needed: to work * in config 0, etc. */ if ((ctrl->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) { f = cdev->config->interface[intf]; if (f && f->setup) value = f->setup(f, ctrl); else f = NULL; } if (value < 0 && !f) { struct usb_configuration *c; c = cdev->config; if (c && c->setup) value = c->setup(c, ctrl); } goto done; } /* respond with data transfer before status phase? */ if (value >= 0) { req->length = value; req->zero = value < w_length; value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); if (value < 0) { DBG(cdev, "ep_queue --> %d\n", value); req->status = 0; composite_setup_complete(gadget->ep0, req); } } done: /* device either stalls (value < 0) or reports success */ return value; } static void composite_disconnect(struct usb_gadget *gadget) { struct usb_composite_dev *cdev = get_gadget_data(gadget); unsigned long flags; /* REVISIT: should we have config and device level * disconnect callbacks? */ spin_lock_irqsave(&cdev->lock, flags); if (cdev->config) reset_config(cdev); spin_unlock_irqrestore(&cdev->lock, flags); } /*-------------------------------------------------------------------------*/ static void /* __init_or_exit */ composite_unbind(struct usb_gadget *gadget) { struct usb_composite_dev *cdev = get_gadget_data(gadget); /* composite_disconnect() must already have been called * by the underlying peripheral controller driver! * so there's no i/o concurrency that could affect the * state protected by cdev->lock. */ WARN_ON(cdev->config); while (!list_empty(&cdev->configs)) { struct usb_configuration *c; c = list_first_entry(&cdev->configs, struct usb_configuration, list); while (!list_empty(&c->functions)) { struct usb_function *f; f = list_first_entry(&c->functions, struct usb_function, list); list_del(&f->list); if (f->unbind) { DBG(cdev, "unbind function '%s'/%p\n", f->name, f); f->unbind(c, f); /* may free memory for "f" */ } } list_del(&c->list); if (c->unbind) { DBG(cdev, "unbind config '%s'/%p\n", c->label, c); c->unbind(c); /* may free memory for "c" */ } } if (composite->unbind) composite->unbind(cdev); if (cdev->req) { #if defined(__IFX_USB_GADGET__) gadget_free_buffer(cdev->req->buf); #else kfree(cdev->req->buf); #endif usb_ep_free_request(gadget->ep0, cdev->req); } kfree(cdev); set_gadget_data(gadget, NULL); composite = NULL; } static void __init string_override_one(struct usb_gadget_strings *tab, u8 id, const char *s) { struct usb_string *str = tab->strings; for (str = tab->strings; str->s; str++) { if (str->id == id) { str->s = s; return; } } } static void __init string_override(struct usb_gadget_strings **tab, u8 id, const char *s) { while (*tab) { string_override_one(*tab, id, s); tab++; } } static int __init composite_bind(struct usb_gadget *gadget) { struct usb_composite_dev *cdev; int status = -ENOMEM; cdev = kzalloc(sizeof *cdev, GFP_KERNEL); if (!cdev) return status; spin_lock_init(&cdev->lock); cdev->gadget = gadget; set_gadget_data(gadget, cdev); INIT_LIST_HEAD(&cdev->configs); /* preallocate control response and buffer */ cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); if (!cdev->req) goto fail; #if defined(__IFX_USB_GADGET__) cdev->req->buf = gadget_alloc_buffer(USB_BUFSIZ); #else cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL); #endif if (!cdev->req->buf) goto fail; cdev->req->complete = composite_setup_complete; gadget->ep0->driver_data = cdev; cdev->bufsiz = USB_BUFSIZ; cdev->driver = composite; usb_gadget_set_selfpowered(gadget); /* interface and string IDs start at zero via kzalloc. * we force endpoints to start unassigned; few controller * drivers will zero ep->driver_data. */ usb_ep_autoconfig_reset(cdev->gadget); /* composite gadget needs to assign strings for whole device (like * serial number), register function drivers, potentially update * power state and consumption, etc */ status = composite->bind(cdev); if (status < 0) goto fail; cdev->desc = *composite->dev; cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket; /* standardized runtime overrides for device ID data */ if (idVendor) cdev->desc.idVendor = cpu_to_le16(idVendor); if (idProduct) cdev->desc.idProduct = cpu_to_le16(idProduct); if (bcdDevice) cdev->desc.bcdDevice = cpu_to_le16(bcdDevice); /* strings can't be assigned before bind() allocates the * releavnt identifiers */ if (cdev->desc.iManufacturer && iManufacturer) string_override(composite->strings, cdev->desc.iManufacturer, iManufacturer); if (cdev->desc.iProduct && iProduct) string_override(composite->strings, cdev->desc.iProduct, iProduct); if (cdev->desc.iSerialNumber && iSerialNumber) string_override(composite->strings, cdev->desc.iSerialNumber, iSerialNumber); INFO(cdev, "%s ready\n", composite->name); return 0; fail: composite_unbind(gadget); return status; } /*-------------------------------------------------------------------------*/ static void composite_suspend(struct usb_gadget *gadget) { struct usb_composite_dev *cdev = get_gadget_data(gadget); struct usb_function *f; /* REVISIT: should we have config level * suspend/resume callbacks? */ DBG(cdev, "suspend\n"); if (cdev->config) { list_for_each_entry(f, &cdev->config->functions, list) { if (f->suspend) f->suspend(f); } } if (composite->suspend) composite->suspend(cdev); } static void composite_resume(struct usb_gadget *gadget) { struct usb_composite_dev *cdev = get_gadget_data(gadget); struct usb_function *f; /* REVISIT: should we have config level * suspend/resume callbacks? */ DBG(cdev, "resume\n"); if (composite->resume) composite->resume(cdev); if (cdev->config) { list_for_each_entry(f, &cdev->config->functions, list) { if (f->resume) f->resume(f); } } } /*-------------------------------------------------------------------------*/ static struct usb_gadget_driver composite_driver = { .speed = USB_SPEED_HIGH, .bind = composite_bind, .unbind = __exit_p(composite_unbind), .setup = composite_setup, .disconnect = composite_disconnect, .suspend = composite_suspend, .resume = composite_resume, .driver = { .owner = THIS_MODULE, }, }; /** * usb_composite_register() - register a composite driver * @driver: the driver to register * Context: single threaded during gadget setup * * This function is used to register drivers using the composite driver * framework. The return value is zero, or a negative errno value. * Those values normally come from the driver's @bind method, which does * all the work of setting up the driver to match the hardware. * * On successful return, the gadget is ready to respond to requests from * the host, unless one of its components invokes usb_gadget_disconnect() * while it was binding. That would usually be done in order to wait for * some userspace participation. */ int __init usb_composite_register(struct usb_composite_driver *driver) { if (!driver || !driver->dev || !driver->bind || composite) return -EINVAL; if (!driver->name) driver->name = "composite"; composite_driver.function = (char *) driver->name; composite_driver.driver.name = driver->name; composite = driver; return usb_gadget_register_driver(&composite_driver); } /** * usb_composite_unregister() - unregister a composite driver * @driver: the driver to unregister * * This function is used to unregister drivers using the composite * driver framework. */ void __exit usb_composite_unregister(struct usb_composite_driver *driver) { if (composite != driver) return; usb_gadget_unregister_driver(&composite_driver); }