diff options
Diffstat (limited to 'drivers/staging/ccg/composite.c')
| -rw-r--r-- | drivers/staging/ccg/composite.c | 1688 |
1 files changed, 0 insertions, 1688 deletions
diff --git a/drivers/staging/ccg/composite.c b/drivers/staging/ccg/composite.c deleted file mode 100644 index 228b4574f228..000000000000 --- a/drivers/staging/ccg/composite.c +++ /dev/null @@ -1,1688 +0,0 @@ -/* - * 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. - */ - -/* #define VERBOSE_DEBUG */ - -#include <linux/kallsyms.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/utsname.h> - -#include <linux/usb/composite.h> -#include <asm/unaligned.h> - -/* - * 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 1024 - -static struct usb_composite_driver *composite; - -/* Some systems will need runtime overrides for the product identifiers - * 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, 0644); -MODULE_PARM_DESC(idVendor, "USB Vendor ID"); - -static ushort idProduct; -module_param(idProduct, ushort, 0644); -MODULE_PARM_DESC(idProduct, "USB Product ID"); - -static ushort bcdDevice; -module_param(bcdDevice, ushort, 0644); -MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); - -static char *iManufacturer; -module_param(iManufacturer, charp, 0644); -MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); - -static char *iProduct; -module_param(iProduct, charp, 0644); -MODULE_PARM_DESC(iProduct, "USB Product string"); - -static char *iSerialNumber; -module_param(iSerialNumber, charp, 0644); -MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); - -static char composite_manufacturer[50]; - -/*-------------------------------------------------------------------------*/ -/** - * next_ep_desc() - advance to the next EP descriptor - * @t: currect pointer within descriptor array - * - * Return: next EP descriptor or NULL - * - * Iterate over @t until either EP descriptor found or - * NULL (that indicates end of list) encountered - */ -static struct usb_descriptor_header** -next_ep_desc(struct usb_descriptor_header **t) -{ - for (; *t; t++) { - if ((*t)->bDescriptorType == USB_DT_ENDPOINT) - return t; - } - return NULL; -} - -/* - * for_each_ep_desc()- iterate over endpoint descriptors in the - * descriptors list - * @start: pointer within descriptor array. - * @ep_desc: endpoint descriptor to use as the loop cursor - */ -#define for_each_ep_desc(start, ep_desc) \ - for (ep_desc = next_ep_desc(start); \ - ep_desc; ep_desc = next_ep_desc(ep_desc+1)) - -/** - * config_ep_by_speed() - configures the given endpoint - * according to gadget speed. - * @g: pointer to the gadget - * @f: usb function - * @_ep: the endpoint to configure - * - * Return: error code, 0 on success - * - * This function chooses the right descriptors for a given - * endpoint according to gadget speed and saves it in the - * endpoint desc field. If the endpoint already has a descriptor - * assigned to it - overwrites it with currently corresponding - * descriptor. The endpoint maxpacket field is updated according - * to the chosen descriptor. - * Note: the supplied function should hold all the descriptors - * for supported speeds - */ -int config_ep_by_speed(struct usb_gadget *g, - struct usb_function *f, - struct usb_ep *_ep) -{ - struct usb_composite_dev *cdev = get_gadget_data(g); - struct usb_endpoint_descriptor *chosen_desc = NULL; - struct usb_descriptor_header **speed_desc = NULL; - - struct usb_ss_ep_comp_descriptor *comp_desc = NULL; - int want_comp_desc = 0; - - struct usb_descriptor_header **d_spd; /* cursor for speed desc */ - - if (!g || !f || !_ep) - return -EIO; - - /* select desired speed */ - switch (g->speed) { - case USB_SPEED_SUPER: - if (gadget_is_superspeed(g)) { - speed_desc = f->ss_descriptors; - want_comp_desc = 1; - break; - } - /* else: Fall trough */ - case USB_SPEED_HIGH: - if (gadget_is_dualspeed(g)) { - speed_desc = f->hs_descriptors; - break; - } - /* else: fall through */ - default: - speed_desc = f->descriptors; - } - /* find descriptors */ - for_each_ep_desc(speed_desc, d_spd) { - chosen_desc = (struct usb_endpoint_descriptor *)*d_spd; - if (chosen_desc->bEndpointAddress == _ep->address) - goto ep_found; - } - return -EIO; - -ep_found: - /* commit results */ - _ep->maxpacket = usb_endpoint_maxp(chosen_desc); - _ep->desc = chosen_desc; - _ep->comp_desc = NULL; - _ep->maxburst = 0; - _ep->mult = 0; - if (!want_comp_desc) - return 0; - - /* - * Companion descriptor should follow EP descriptor - * USB 3.0 spec, #9.6.7 - */ - comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd); - if (!comp_desc || - (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP)) - return -EIO; - _ep->comp_desc = comp_desc; - if (g->speed == USB_SPEED_SUPER) { - switch (usb_endpoint_type(_ep->desc)) { - case USB_ENDPOINT_XFER_ISOC: - /* mult: bits 1:0 of bmAttributes */ - _ep->mult = comp_desc->bmAttributes & 0x3; - case USB_ENDPOINT_XFER_BULK: - case USB_ENDPOINT_XFER_INT: - _ep->maxburst = comp_desc->bMaxBurst + 1; - break; - default: - if (comp_desc->bMaxBurst != 0) - ERROR(cdev, "ep0 bMaxBurst must be 0\n"); - _ep->maxburst = 1; - break; - } - } - return 0; -} - -/** - * 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; - - 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; - if (!config->superspeed && function->ss_descriptors) - config->superspeed = 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; - unsigned long flags; - int status = 0; - - spin_lock_irqsave(&cdev->lock, flags); - - if (WARN_ON(cdev->deactivations == 0)) - status = -EINVAL; - else { - cdev->deactivations--; - if (cdev->deactivations == 0) - status = usb_gadget_connect(cdev->gadget); - } - - spin_unlock_irqrestore(&cdev->lock, flags); - 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 targeted 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 - * identifiers 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 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; - - switch (speed) { - case USB_SPEED_SUPER: - descriptors = f->ss_descriptors; - break; - case USB_SPEED_HIGH: - descriptors = f->hs_descriptors; - break; - default: - 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->speed == USB_SPEED_SUPER) - speed = gadget->speed; - else 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 */ - switch (speed) { - case USB_SPEED_SUPER: - if (!c->superspeed) - continue; - break; - case USB_SPEED_HIGH: - if (!c->highspeed) - continue; - break; - default: - 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; - int ss = 0; - - if (gadget_is_dualspeed(gadget)) { - if (gadget->speed == USB_SPEED_HIGH) - hs = 1; - if (gadget->speed == USB_SPEED_SUPER) - ss = 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 (ss) { - if (!c->superspeed) - continue; - } else if (hs) { - if (!c->highspeed) - continue; - } else { - if (!c->fullspeed) - continue; - } - count++; - } - return count; -} - -/** - * bos_desc() - prepares the BOS descriptor. - * @cdev: pointer to usb_composite device to generate the bos - * descriptor for - * - * This function generates the BOS (Binary Device Object) - * descriptor and its device capabilities descriptors. The BOS - * descriptor should be supported by a SuperSpeed device. - */ -static int bos_desc(struct usb_composite_dev *cdev) -{ - struct usb_ext_cap_descriptor *usb_ext; - struct usb_ss_cap_descriptor *ss_cap; - struct usb_dcd_config_params dcd_config_params; - 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(&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); - - /* - * The Superspeed USB Capability descriptor shall be implemented by all - * SuperSpeed devices. - */ - ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength); - bos->bNumDeviceCaps++; - le16_add_cpu(&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; - - /* Get Controller configuration */ - if (cdev->gadget->ops->get_config_params) - cdev->gadget->ops->get_config_params(&dcd_config_params); - else { - dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT; - dcd_config_params.bU2DevExitLat = - cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT); - } - ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat; - ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat; - - return le16_to_cpu(bos->wTotalLength); -} - -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; - - DBG(cdev, "reset config\n"); - - 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; - struct usb_configuration *c = NULL; - int result = -EINVAL; - unsigned power = gadget_is_otg(gadget) ? 8 : 100; - int tmp; - - if (number) { - list_for_each_entry(c, &cdev->configs, list) { - if (c->bConfigurationValue == number) { - /* - * We disable the FDs of the previous - * configuration only if the new configuration - * is a valid one - */ - if (cdev->config) - reset_config(cdev); - result = 0; - break; - } - } - if (result < 0) - goto done; - } else { /* Zero configuration value - need to reset the config */ - if (cdev->config) - reset_config(cdev); - result = 0; - } - - INFO(cdev, "%s config #%d: %s\n", - usb_speed_string(gadget->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]; - struct usb_descriptor_header **descriptors; - - 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. - */ - switch (gadget->speed) { - case USB_SPEED_SUPER: - descriptors = f->ss_descriptors; - break; - case USB_SPEED_HIGH: - descriptors = f->hs_descriptors; - break; - default: - descriptors = f->descriptors; - } - - for (; *descriptors; ++descriptors) { - struct usb_endpoint_descriptor *ep; - int addr; - - 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) { - DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n", - tmp, f->name, f, result); - - reset_config(cdev); - goto done; - } - - if (result == USB_GADGET_DELAYED_STATUS) { - DBG(cdev, - "%s: interface %d (%s) requested delayed status\n", - __func__, tmp, f->name); - cdev->delayed_status++; - DBG(cdev, "delayed_status count %d\n", - cdev->delayed_status); - } - } - - /* 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); - if (result >= 0 && cdev->delayed_status) - result = USB_GADGET_DELAYED_STATUS; - return result; -} - -/** - * usb_add_config() - add a configuration to a device. - * @cdev: wraps the USB gadget - * @config: the configuration, with bConfigurationValue assigned - * @bind: the configuration's bind function - * Context: single threaded during gadget setup - * - * One of the main tasks of a composite @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 (*bind)(struct usb_configuration *)) -{ - int status = -EINVAL; - struct usb_configuration *c; - - DBG(cdev, "adding config #%u '%s'/%p\n", - config->bConfigurationValue, - config->label, config); - - if (!config->bConfigurationValue || !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; - memset(config->interface, 0, sizeof(config->interface)); - - status = bind(config); - if (status < 0) { - while (!list_empty(&config->functions)) { - struct usb_function *f; - - f = list_first_entry(&config->functions, - struct usb_function, list); - list_del(&f->list); - if (f->unbind) { - DBG(cdev, "unbind function '%s'/%p\n", - f->name, f); - f->unbind(config, f); - /* may free memory for "f" */ - } - } - list_del(&config->list); - config->cdev = NULL; - } else { - unsigned i; - - DBG(cdev, "cfg %d/%p speeds:%s%s%s\n", - config->bConfigurationValue, config, - config->superspeed ? " super" : "", - 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 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; -} - -static void remove_config(struct usb_composite_dev *cdev, - struct usb_configuration *config) -{ - while (!list_empty(&config->functions)) { - struct usb_function *f; - - f = list_first_entry(&config->functions, - struct usb_function, list); - list_del(&f->list); - if (f->unbind) { - DBG(cdev, "unbind function '%s'/%p\n", f->name, f); - f->unbind(config, f); - /* may free memory for "f" */ - } - } - list_del(&config->list); - if (config->unbind) { - DBG(cdev, "unbind config '%s'/%p\n", config->label, config); - config->unbind(config); - /* may free memory for "c" */ - } -} - -/** - * usb_remove_config() - remove a configuration from a device. - * @cdev: wraps the USB gadget - * @config: the configuration - * - * Drivers must call usb_gadget_disconnect before calling this function - * to disconnect the device from the host and make sure the host will not - * try to enumerate the device while we are changing the config list. - */ -void usb_remove_config(struct usb_composite_dev *cdev, - struct usb_configuration *config) -{ - unsigned long flags; - - spin_lock_irqsave(&cdev->lock, flags); - - if (cdev->config == config) - reset_config(cdev); - - spin_unlock_irqrestore(&cdev->lock, flags); - - remove_config(cdev, config); -} - -/*-------------------------------------------------------------------------*/ - -/* 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; - __le16 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; - const char *str; - - /* 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. First - * check if the string has not been overridden. - */ - if (cdev->manufacturer_override == id) - str = iManufacturer ?: composite->iManufacturer ?: - composite_manufacturer; - else if (cdev->product_override == id) - str = iProduct ?: composite->iProduct; - else if (cdev->serial_override == id) - str = iSerialNumber ?: composite->iSerialNumber; - else - str = NULL; - if (str) { - struct usb_gadget_strings strings = { - .language = language, - .strings = &(struct usb_string) { 0xff, str } - }; - return usb_gadget_get_string(&strings, 0xff, buf); - } - - /* 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) -{ - int next = cdev->next_string_id; - - for (; str->s; ++str) { - if (unlikely(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) -{ - unsigned next = c->next_string_id; - if (unlikely(n > 254 || (unsigned)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) - 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; - int status = 0; - 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); - struct usb_function *f = NULL; - u8 endp; - - /* 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 = 0; - 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); - cdev->desc.bMaxPacketSize0 = - cdev->gadget->ep0->maxpacket; - if (gadget_is_superspeed(gadget)) { - if (gadget->speed >= USB_SPEED_SUPER) { - cdev->desc.bcdUSB = cpu_to_le16(0x0300); - cdev->desc.bMaxPacketSize0 = 9; - } else { - cdev->desc.bcdUSB = cpu_to_le16(0x0210); - } - } - - 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) || - gadget->speed >= USB_SPEED_SUPER) - 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) || - gadget->speed >= USB_SPEED_SUPER) - 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; - case USB_DT_BOS: - if (gadget_is_superspeed(gadget)) { - value = bos_desc(cdev); - 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 || intf >= 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); - if (value == USB_GADGET_DELAYED_STATUS) { - DBG(cdev, - "%s: interface %d (%s) requested delayed status\n", - __func__, intf, f->name); - cdev->delayed_status++; - DBG(cdev, "delayed_status count %d\n", - cdev->delayed_status); - } - break; - case USB_REQ_GET_INTERFACE: - if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) - goto unknown; - if (!cdev->config || intf >= 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; - - /* - * USB 3.0 additions: - * Function driver should handle get_status request. If such cb - * wasn't supplied we respond with default value = 0 - * Note: function driver should supply such cb only for the first - * interface of the function - */ - case USB_REQ_GET_STATUS: - if (!gadget_is_superspeed(gadget)) - goto unknown; - if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE)) - goto unknown; - value = 2; /* This is the length of the get_status reply */ - put_unaligned_le16(0, req->buf); - if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) - break; - f = cdev->config->interface[intf]; - if (!f) - break; - status = f->get_status ? f->get_status(f) : 0; - if (status < 0) - break; - put_unaligned_le16(status & 0x0000ffff, req->buf); - break; - /* - * Function drivers should handle SetFeature/ClearFeature - * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied - * only for the first interface of the function - */ - case USB_REQ_CLEAR_FEATURE: - case USB_REQ_SET_FEATURE: - if (!gadget_is_superspeed(gadget)) - goto unknown; - if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE)) - goto unknown; - switch (w_value) { - case USB_INTRF_FUNC_SUSPEND: - if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) - break; - f = cdev->config->interface[intf]; - if (!f) - break; - value = 0; - if (f->func_suspend) - value = f->func_suspend(f, w_index >> 8); - if (value < 0) { - ERROR(cdev, - "func_suspend() returned error %d\n", - value); - value = 0; - } - break; - } - 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 and endpoints... - * punt other recipients (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. - */ - switch (ctrl->bRequestType & USB_RECIP_MASK) { - case USB_RECIP_INTERFACE: - if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) - break; - 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; - } - - if (f && f->setup) - value = f->setup(f, ctrl); - else { - 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 && value != USB_GADGET_DELAYED_STATUS) { - 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); - } - } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) { - WARN(cdev, - "%s: Delayed status not supported for w_length != 0", - __func__); - } - -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); - if (composite->disconnect) - composite->disconnect(cdev); - spin_unlock_irqrestore(&cdev->lock, flags); -} - -/*-------------------------------------------------------------------------*/ - -static ssize_t composite_show_suspended(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct usb_gadget *gadget = dev_to_usb_gadget(dev); - struct usb_composite_dev *cdev = get_gadget_data(gadget); - - return sprintf(buf, "%d\n", cdev->suspended); -} - -static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL); - -static void -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); - remove_config(cdev, c); - } - if (composite->unbind) - composite->unbind(cdev); - - if (cdev->req) { - kfree(cdev->req->buf); - usb_ep_free_request(gadget->ep0, cdev->req); - } - device_remove_file(&gadget->dev, &dev_attr_suspended); - kfree(cdev); - set_gadget_data(gadget, NULL); - composite = NULL; -} - -static u8 override_id(struct usb_composite_dev *cdev, u8 *desc) -{ - if (!*desc) { - int ret = usb_string_id(cdev); - if (unlikely(ret < 0)) - WARNING(cdev, "failed to override string ID\n"); - else - *desc = ret; - } - - return *desc; -} - -static int composite_bind(struct usb_gadget *gadget, - struct usb_gadget_driver *driver) -{ - 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; - cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL); - if (!cdev->req->buf) - goto fail; - cdev->req->complete = composite_setup_complete; - gadget->ep0->driver_data = cdev; - - cdev->bufsiz = USB_BUFSIZ; - cdev->driver = composite; - - /* - * As per USB compliance update, a device that is actively drawing - * more than 100mA from USB must report itself as bus-powered in - * the GetStatus(DEVICE) call. - */ - if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW) - 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; - - /* standardized runtime overrides for device ID data */ - if (idVendor) - cdev->desc.idVendor = cpu_to_le16(idVendor); - else - idVendor = le16_to_cpu(cdev->desc.idVendor); - if (idProduct) - cdev->desc.idProduct = cpu_to_le16(idProduct); - else - idProduct = le16_to_cpu(cdev->desc.idProduct); - if (bcdDevice) - cdev->desc.bcdDevice = cpu_to_le16(bcdDevice); - else - bcdDevice = le16_to_cpu(cdev->desc.bcdDevice); - - /* string overrides */ - if (iManufacturer || !cdev->desc.iManufacturer) { - if (!iManufacturer && !composite->iManufacturer && - !*composite_manufacturer) - snprintf(composite_manufacturer, - sizeof composite_manufacturer, - "%s %s with %s", - init_utsname()->sysname, - init_utsname()->release, - gadget->name); - - cdev->manufacturer_override = - override_id(cdev, &cdev->desc.iManufacturer); - } - - if (iProduct || (!cdev->desc.iProduct && composite->iProduct)) - cdev->product_override = - override_id(cdev, &cdev->desc.iProduct); - - if (iSerialNumber || - (!cdev->desc.iSerialNumber && composite->iSerialNumber)) - cdev->serial_override = - override_id(cdev, &cdev->desc.iSerialNumber); - - /* has userspace failed to provide a serial number? */ - if (composite->needs_serial && !cdev->desc.iSerialNumber) - WARNING(cdev, "userspace failed to provide iSerialNumber\n"); - - /* finish up */ - status = device_create_file(&gadget->dev, &dev_attr_suspended); - if (status) - goto fail; - - 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); - - cdev->suspended = 1; - - usb_gadget_vbus_draw(gadget, 2); -} - -static void -composite_resume(struct usb_gadget *gadget) -{ - struct usb_composite_dev *cdev = get_gadget_data(gadget); - struct usb_function *f; - u8 maxpower; - - /* 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); - } - - maxpower = cdev->config->bMaxPower; - - usb_gadget_vbus_draw(gadget, maxpower ? - (2 * maxpower) : CONFIG_USB_GADGET_VBUS_DRAW); - } - - cdev->suspended = 0; -} - -/*-------------------------------------------------------------------------*/ - -static struct usb_gadget_driver composite_driver = { - .bind = composite_bind, - .unbind = composite_unbind, - - .setup = composite_setup, - .disconnect = composite_disconnect, - - .suspend = composite_suspend, - .resume = composite_resume, - - .driver = { - .owner = THIS_MODULE, - }, -}; - -/** - * usb_composite_probe() - register a composite driver - * @driver: the driver to register - * @bind: the callback used to allocate resources that are shared across the - * whole device, such as string IDs, and add its configurations using - * @usb_add_config(). This may fail by returning a negative errno - * value; it should return zero on successful initialization. - * 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_probe(struct usb_composite_driver *driver) -{ - if (!driver || !driver->dev || composite || !driver->bind) - return -EINVAL; - - if (!driver->name) - driver->name = "composite"; - if (!driver->iProduct) - driver->iProduct = driver->name; - composite_driver.function = (char *) driver->name; - composite_driver.driver.name = driver->name; - composite_driver.max_speed = driver->max_speed; - composite = driver; - - return usb_gadget_probe_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); -} - -/** - * usb_composite_setup_continue() - Continue with the control transfer - * @cdev: the composite device who's control transfer was kept waiting - * - * This function must be called by the USB function driver to continue - * with the control transfer's data/status stage in case it had requested to - * delay the data/status stages. A USB function's setup handler (e.g. set_alt()) - * can request the composite framework to delay the setup request's data/status - * stages by returning USB_GADGET_DELAYED_STATUS. - */ -void usb_composite_setup_continue(struct usb_composite_dev *cdev) -{ - int value; - struct usb_request *req = cdev->req; - unsigned long flags; - - DBG(cdev, "%s\n", __func__); - spin_lock_irqsave(&cdev->lock, flags); - - if (cdev->delayed_status == 0) { - WARN(cdev, "%s: Unexpected call\n", __func__); - - } else if (--cdev->delayed_status == 0) { - DBG(cdev, "%s: Completing delayed status\n", __func__); - req->length = 0; - value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); - if (value < 0) { - DBG(cdev, "ep_queue --> %d\n", value); - req->status = 0; - composite_setup_complete(cdev->gadget->ep0, req); - } - } - - spin_unlock_irqrestore(&cdev->lock, flags); -} - |