| /* |
| * composite.c - infrastructure for Composite USB Gadgets |
| * |
| * Copyright (C) 2006-2008 David Brownell |
| * U-boot porting: Lukasz Majewski <l.majewski@samsung.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| #undef DEBUG |
| |
| #include <linux/bitops.h> |
| #include <linux/usb/composite.h> |
| |
| #define USB_BUFSIZ 4096 |
| |
| static struct usb_composite_driver *composite; |
| |
| /** |
| * 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 usb_add_function(struct usb_configuration *config, |
| struct usb_function *function) |
| { |
| int value = -EINVAL; |
| |
| debug("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); |
| |
| if (function->bind) { |
| value = function->bind(config, function); |
| if (value < 0) { |
| list_del(&function->list); |
| function->config = NULL; |
| } |
| } else |
| value = 0; |
| |
| if (!config->fullspeed && function->descriptors) |
| config->fullspeed = 1; |
| if (!config->highspeed && function->hs_descriptors) |
| config->highspeed = 1; |
| |
| done: |
| if (value) |
| debug("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; |
| int status = 0; |
| |
| if (cdev->deactivations == 0) |
| status = usb_gadget_disconnect(cdev->gadget); |
| if (status == 0) |
| cdev->deactivations++; |
| |
| 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; |
| |
| if (cdev->deactivations == 0) |
| status = -EINVAL; |
| else { |
| cdev->deactivations--; |
| if (cdev->deactivations == 0) |
| status = usb_gadget_connect(cdev->gadget); |
| } |
| |
| 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 usb_interface_id(struct usb_configuration *config, |
| struct usb_function *function) |
| { |
| unsigned char 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) |
| { |
| int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; |
| void *next = buf + USB_DT_CONFIG_SIZE; |
| struct usb_descriptor_header **descriptors; |
| struct usb_config_descriptor *c = buf; |
| int status; |
| struct usb_function *f; |
| |
| /* write the config descriptor */ |
| c = buf; |
| c->bLength = USB_DT_CONFIG_SIZE; |
| c->bDescriptorType = type; |
| |
| 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) { |
| 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) |
| { |
| enum usb_device_speed speed = USB_SPEED_HIGH; |
| struct usb_gadget *gadget = cdev->gadget; |
| u8 type = w_value >> 8; |
| int hs = 0; |
| struct usb_configuration *c; |
| |
| if (gadget_is_dualspeed(gadget)) { |
| if (gadget->speed == USB_SPEED_HIGH) |
| hs = 1; |
| if (type == USB_DT_OTHER_SPEED_CONFIG) |
| hs = !hs; |
| if (hs) |
| speed = USB_SPEED_HIGH; |
| } |
| |
| w_value &= 0xff; |
| list_for_each_entry(c, &cdev->configs, list) { |
| 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; |
| unsigned count = 0; |
| int hs = 0; |
| struct usb_configuration *c; |
| |
| 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; |
| |
| debug("%s:\n", __func__); |
| |
| list_for_each_entry(f, &cdev->config->functions, list) { |
| if (f->disable) |
| f->disable(f); |
| |
| bitmap_zero(f->endpoints, 32); |
| } |
| 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; |
| unsigned power = gadget_is_otg(gadget) ? 8 : 100; |
| struct usb_descriptor_header **descriptors; |
| int result = -EINVAL; |
| struct usb_endpoint_descriptor *ep; |
| struct usb_configuration *c = NULL; |
| int addr; |
| int tmp; |
| struct usb_function *f; |
| |
| 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; |
| |
| debug("%s: %s speed config #%d: %s\n", __func__, |
| ({ 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++) { |
| f = c->interface[tmp]; |
| if (!f) |
| break; |
| |
| /* |
| * Record which endpoints are used by the function. This is used |
| * to dispatch control requests targeted at that endpoint to the |
| * function's setup callback instead of the current |
| * configuration's setup callback. |
| */ |
| if (gadget->speed == USB_SPEED_HIGH) |
| descriptors = f->hs_descriptors; |
| else |
| descriptors = f->descriptors; |
| |
| for (; *descriptors; ++descriptors) { |
| if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT) |
| continue; |
| |
| ep = (struct usb_endpoint_descriptor *)*descriptors; |
| addr = ((ep->bEndpointAddress & 0x80) >> 3) |
| | (ep->bEndpointAddress & 0x0f); |
| __set_bit(addr, f->endpoints); |
| } |
| |
| result = f->set_alt(f, tmp, 0); |
| if (result < 0) { |
| debug("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 usb_add_config(struct usb_composite_dev *cdev, |
| struct usb_configuration *config) |
| { |
| int status = -EINVAL; |
| struct usb_configuration *c; |
| struct usb_function *f; |
| unsigned int i; |
| |
| debug("%s: adding config #%u '%s'/%p\n", __func__, |
| 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 { |
| debug("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++) { |
| f = config->interface[i]; |
| if (!f) |
| continue; |
| debug("%s: interface %d = %s/%p\n", |
| __func__, i, f->name, f); |
| } |
| } |
| |
| usb_ep_autoconfig_reset(cdev->gadget); |
| |
| done: |
| if (status) |
| debug("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 |
| ) |
| { |
| int value; |
| struct usb_gadget_strings *s; |
| |
| 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_string_descriptor *s = buf; |
| struct usb_gadget_strings **sp; |
| int len; |
| struct usb_configuration *c; |
| struct usb_function *f; |
| |
| /* |
| * 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) { |
| 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, |
| * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure |
| * that for example different functions don't wrongly assign different |
| * meanings to the same identifier. |
| */ |
| int usb_string_id(struct usb_composite_dev *cdev) |
| { |
| if (cdev->next_string_id < 254) { |
| /* |
| * string id 0 is reserved by USB spec for list of |
| * supported languages |
| * 255 reserved as well? -- mina86 |
| */ |
| cdev->next_string_id++; |
| return cdev->next_string_id; |
| } |
| return -ENODEV; |
| } |
| |
| /** |
| * usb_string_ids() - allocate unused string IDs in batch |
| * @cdev: the device whose string descriptor IDs are being allocated |
| * @str: an array of usb_string objects to assign numbers to |
| * Context: single threaded during gadget setup |
| * |
| * @usb_string_ids() is called from bind() callbacks to allocate |
| * string IDs. Drivers for functions, configurations, or gadgets will |
| * then copy IDs from the string table to the appropriate descriptors |
| * and string table for other languages. |
| * |
| * All string identifier should be allocated using this, |
| * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for |
| * example different functions don't wrongly assign different meanings |
| * to the same identifier. |
| */ |
| int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str) |
| { |
| u8 next = cdev->next_string_id; |
| |
| for (; str->s; ++str) { |
| if (next >= 254) |
| return -ENODEV; |
| str->id = ++next; |
| } |
| |
| cdev->next_string_id = next; |
| |
| return 0; |
| } |
| |
| /** |
| * usb_string_ids_n() - allocate unused string IDs in batch |
| * @c: the device whose string descriptor IDs are being allocated |
| * @n: number of string IDs to allocate |
| * Context: single threaded during gadget setup |
| * |
| * Returns the first requested ID. This ID and next @n-1 IDs are now |
| * valid IDs. At least provided that @n is non-zero because if it |
| * is, returns last requested ID which is now very useful information. |
| * |
| * @usb_string_ids_n() 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, |
| * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for |
| * example different functions don't wrongly assign different meanings |
| * to the same identifier. |
| */ |
| int usb_string_ids_n(struct usb_composite_dev *c, unsigned n) |
| { |
| u8 next = c->next_string_id; |
| |
| if (n > 254 || next + n > 254) |
| return -ENODEV; |
| |
| c->next_string_id += n; |
| return next + 1; |
| } |
| |
| static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) |
| { |
| if (req->status || req->actual != req->length) |
| debug("%s: setup complete --> %d, %d/%d\n", __func__, |
| 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) |
| { |
| u16 w_length = le16_to_cpu(ctrl->wLength); |
| u16 w_index = le16_to_cpu(ctrl->wIndex); |
| u16 w_value = le16_to_cpu(ctrl->wValue); |
| struct usb_composite_dev *cdev = get_gadget_data(gadget); |
| u8 intf = w_index & 0xFF; |
| int value = -EOPNOTSUPP; |
| struct usb_request *req = cdev->req; |
| struct usb_function *f = NULL; |
| int standard; |
| u8 endp; |
| struct usb_configuration *c; |
| |
| /* |
| * 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; |
| standard = (ctrl->bRequestType & USB_TYPE_MASK) |
| == USB_TYPE_STANDARD; |
| if (!standard) |
| goto unknown; |
| |
| 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 = 1; |
| 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; |
| |
| 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; |
| default: |
| goto unknown; |
| } |
| 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) |
| debug("HNP available\n"); |
| else if (gadget->a_alt_hnp_support) |
| debug("HNP on another port\n"); |
| else |
| debug("HNP inactive\n"); |
| } |
| |
| value = set_config(cdev, ctrl, w_value); |
| 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: |
| debug("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 and endpoints... |
| * punt other recipients (other, WUSB, ...) to the current |
| * configuration code. |
| */ |
| switch (ctrl->bRequestType & USB_RECIP_MASK) { |
| case USB_RECIP_INTERFACE: |
| f = cdev->config->interface[intf]; |
| break; |
| |
| case USB_RECIP_ENDPOINT: |
| endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f); |
| list_for_each_entry(f, &cdev->config->functions, list) { |
| if (test_bit(endp, f->endpoints)) |
| break; |
| } |
| if (&f->list == &cdev->config->functions) |
| f = NULL; |
| break; |
| /* |
| * dfu-util (version 0.5) sets bmRequestType.Receipent = Device |
| * for non-standard request (w_value = 0x21, |
| * bRequest = GET_DESCRIPTOR in this case). |
| * When only one interface is registered (as it is done now), |
| * then this request shall be handled as it was requested for |
| * interface. |
| * |
| * In the below code it is checked if only one interface is |
| * present and proper function for it is extracted. Due to that |
| * function's setup (f->setup) is called to handle this |
| * special non-standard request. |
| */ |
| case USB_RECIP_DEVICE: |
| debug("cdev->config->next_interface_id: %d intf: %d\n", |
| cdev->config->next_interface_id, intf); |
| if (cdev->config->next_interface_id == 1) |
| f = cdev->config->interface[intf]; |
| break; |
| } |
| |
| if (f && f->setup) { |
| value = f->setup(f, ctrl); |
| break; |
| } else { |
| 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_KERNEL); |
| if (value < 0) { |
| debug("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); |
| |
| if (cdev->config) |
| reset_config(cdev); |
| if (composite->disconnect) |
| composite->disconnect(cdev); |
| } |
| |
| static void composite_unbind(struct usb_gadget *gadget) |
| { |
| struct usb_composite_dev *cdev = get_gadget_data(gadget); |
| struct usb_configuration *c; |
| struct usb_function *f; |
| |
| /* |
| * 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. |
| */ |
| while (!list_empty(&cdev->configs)) { |
| c = list_first_entry(&cdev->configs, |
| struct usb_configuration, list); |
| while (!list_empty(&c->functions)) { |
| f = list_first_entry(&c->functions, |
| struct usb_function, list); |
| list_del(&f->list); |
| if (f->unbind) { |
| debug("unbind function '%s'/%p\n", |
| f->name, f); |
| f->unbind(c, f); |
| } |
| } |
| list_del(&c->list); |
| if (c->unbind) { |
| debug("unbind config '%s'/%p\n", c->label, c); |
| c->unbind(c); |
| } |
| } |
| if (composite->unbind) |
| composite->unbind(cdev); |
| |
| if (cdev->req) { |
| kfree(cdev->req->buf); |
| usb_ep_free_request(gadget->ep0, cdev->req); |
| } |
| kfree(cdev); |
| set_gadget_data(gadget, NULL); |
| |
| composite = NULL; |
| } |
| |
| static int composite_bind(struct usb_gadget *gadget) |
| { |
| int status = -ENOMEM; |
| struct usb_composite_dev *cdev; |
| |
| cdev = calloc(sizeof *cdev, 1); |
| if (!cdev) |
| return status; |
| |
| 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; |
| cdev->req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, USB_BUFSIZ); |
| 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); |
| usb_ep_autoconfig_reset(cdev->gadget); |
| |
| status = composite->bind(cdev); |
| if (status < 0) |
| goto fail; |
| |
| memcpy(&cdev->desc, composite->dev, |
| sizeof(struct usb_device_descriptor)); |
| cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket; |
| |
| debug("%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; |
| |
| debug("%s: suspend\n", __func__); |
| if (cdev->config) { |
| list_for_each_entry(f, &cdev->config->functions, list) { |
| if (f->suspend) |
| f->suspend(f); |
| } |
| } |
| if (composite->suspend) |
| composite->suspend(cdev); |
| |
| cdev->suspended = 1; |
| } |
| |
| static void |
| composite_resume(struct usb_gadget *gadget) |
| { |
| struct usb_composite_dev *cdev = get_gadget_data(gadget); |
| struct usb_function *f; |
| |
| debug("%s: resume\n", __func__); |
| if (composite->resume) |
| composite->resume(cdev); |
| if (cdev->config) { |
| list_for_each_entry(f, &cdev->config->functions, list) { |
| if (f->resume) |
| f->resume(f); |
| } |
| } |
| |
| cdev->suspended = 0; |
| } |
| |
| static struct usb_gadget_driver composite_driver = { |
| .speed = USB_SPEED_HIGH, |
| |
| .bind = composite_bind, |
| .unbind = composite_unbind, |
| |
| .setup = composite_setup, |
| .disconnect = composite_disconnect, |
| |
| .suspend = composite_suspend, |
| .resume = composite_resume, |
| }; |
| |
| /** |
| * 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 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; |
| |
| 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 usb_composite_unregister(struct usb_composite_driver *driver) |
| { |
| if (composite != driver) |
| return; |
| usb_gadget_unregister_driver(&composite_driver); |
| composite = NULL; |
| } |