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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * composite.c - infrastructure for Composite USB Gadgets
- *
- * Copyright (C) 2006-2008 David Brownell
- * U-Boot porting: Lukasz Majewski <l.majewski@samsung.com>
- */
- #undef DEBUG
- #include <log.h>
- #include <dm/devres.h>
- #include <linux/bitops.h>
- #include <linux/bug.h>
- #include <linux/usb/composite.h>
- #define USB_BUFSIZ 4096
- /* Helper type for accessing packed u16 pointers */
- typedef struct { __le16 val; } __packed __le16_packed;
- static struct usb_composite_driver *composite;
- static inline void le16_add_cpu_packed(__le16_packed *var, u16 val)
- {
- var->val = cpu_to_le16(le16_to_cpu(var->val) + val);
- }
- /**
- * 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;
- 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_UNKNOWN;
- 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->gadget->ep0->maxpacket;
- 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);
- generic_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, void *buf)
- {
- const struct usb_gadget_strings *s;
- u16 language;
- __le16_packed *tmp;
- __le16_packed *end = (buf + 252);
- while (*sp) {
- s = *sp;
- language = cpu_to_le16(s->language);
- for (tmp = buf; tmp->val && tmp < end; tmp++) {
- if (tmp->val == language)
- goto repeat;
- }
- tmp->val = 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);
- }
- static int bos_desc(struct usb_composite_dev *cdev)
- {
- struct usb_ext_cap_descriptor *usb_ext;
- struct usb_bos_descriptor *bos = cdev->req->buf;
- bos->bLength = USB_DT_BOS_SIZE;
- bos->bDescriptorType = USB_DT_BOS;
- bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
- bos->bNumDeviceCaps = 0;
- /*
- * A SuperSpeed device shall include the USB2.0 extension descriptor
- * and shall support LPM when operating in USB2.0 HS mode.
- */
- usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
- bos->bNumDeviceCaps++;
- le16_add_cpu_packed((__le16_packed *)&bos->wTotalLength,
- USB_DT_USB_EXT_CAP_SIZE);
- usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
- usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
- usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
- usb_ext->bmAttributes =
- cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);
- /*
- * The Superspeed USB Capability descriptor shall be implemented
- * by all SuperSpeed devices.
- */
- if (gadget_is_superspeed(cdev->gadget)) {
- struct usb_ss_cap_descriptor *ss_cap;
- ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
- bos->bNumDeviceCaps++;
- le16_add_cpu_packed((__le16_packed *)&bos->wTotalLength,
- USB_DT_USB_SS_CAP_SIZE);
- ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
- ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
- ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
- ss_cap->bmAttributes = 0; /* LTM is not supported yet */
- ss_cap->wSpeedSupported =
- cpu_to_le16(USB_LOW_SPEED_OPERATION |
- USB_FULL_SPEED_OPERATION |
- USB_HIGH_SPEED_OPERATION |
- USB_5GBPS_OPERATION);
- ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
- ss_cap->bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT;
- ss_cap->bU2DevExitLat =
- cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
- }
- return le16_to_cpu(bos->wTotalLength);
- }
- /*
- * 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 =
- count_configs(cdev, USB_DT_DEVICE);
- /*
- * If the speed is Super speed, then the supported
- * max packet size is 512 and it should be sent as
- * exponent of 2. So, 9(2^9=512) should be filled in
- * bMaxPacketSize0. Also fill USB version as 3.0
- * if speed is Super speed.
- */
- if (cdev->gadget->speed == USB_SPEED_SUPER) {
- cdev->desc.bMaxPacketSize0 = 9;
- cdev->desc.bcdUSB = cpu_to_le16(0x0300);
- } else {
- cdev->desc.bMaxPacketSize0 =
- cdev->gadget->ep0->maxpacket;
- }
- 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;
- case USB_DT_BOS:
- if (gadget_is_superspeed(cdev->gadget))
- value = bos_desc(cdev);
- 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);
- if (!cdev->config)
- goto done;
- /*
- * 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);
- else {
- c = cdev->config;
- if (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.
- */
- #ifdef __UBOOT__
- assert_noisy(!cdev->config);
- #else
- BUG_ON(cdev->config);
- #endif
- 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);
- }
- free(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,
- .reset = composite_disconnect,
- .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)
- {
- int res;
- if (!driver || !driver->dev || !driver->bind || composite)
- return -EINVAL;
- if (!driver->name)
- driver->name = "composite";
- composite = driver;
- res = usb_gadget_register_driver(&composite_driver);
- if (res != 0)
- composite = NULL;
- return res;
- }
- /**
- * 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;
- }
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