From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Tue, 17 Apr 2012 17:32:07 +0200 Subject: [U-Boot] [PATCH v3 1/3] usb:gadget:composite USB composite gadget support In-Reply-To: <1334671641-644-2-git-send-email-l.majewski@samsung.com> References: <1334214931-19480-1-git-send-email-l.majewski@samsung.com> <1334671641-644-1-git-send-email-l.majewski@samsung.com> <1334671641-644-2-git-send-email-l.majewski@samsung.com> Message-ID: <201204171732.08053.marex@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Lukasz Majewski, > USB Composite gadget implementation for u-boot. It builds on top > of USB UDC drivers. > > This commit is based on following files from Linux Kernel v2.6.36: > > ./include/linux/usb/composite.h > ./drivers/usb/gadget/composite.c > > SHA1: d187abb9a83e6c6b6e9f2ca17962bdeafb4bc903 > > Signed-off-by: Lukasz Majewski > Signed-off-by: Kyungmin Park > Cc: Marek Vasut > > --- > Changes for v2: > - Squash the strict kernel files with u-boot compatibility layer. > - Removal of dead/kernel specific code > - Comments corrected according to u-boot coding style > Changes for v3: > - Remove unlikely function call > - Code indentation fixup > > --- > drivers/usb/gadget/composite.c | 1091 > +++++++++++++++++++++++++++++++++++++++ include/linux/usb/composite.h | > 350 +++++++++++++ > include/usb/lin_gadget_compat.h | 25 +- > 3 files changed, 1464 insertions(+), 2 deletions(-) > create mode 100644 drivers/usb/gadget/composite.c > create mode 100644 include/linux/usb/composite.h > > diff --git a/drivers/usb/gadget/composite.c > b/drivers/usb/gadget/composite.c new file mode 100644 > index 0000000..0415aa4 > --- /dev/null > +++ b/drivers/usb/gadget/composite.c > @@ -0,0 +1,1091 @@ > +/* > + * composite.c - infrastructure for Composite USB Gadgets > + * > + * Copyright (C) 2006-2008 David Brownell > + * U-boot porting: Lukasz Majewski > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 > USA + */ > +#undef DEBUG > + > +#include > +#include > + > +/* big enough to hold our biggest descriptor */ > +#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) { > + printf("WARNING in %s line %d\n", __FILE__, __LINE__); This should be certainly more descriptive ;-) > + 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 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; > + > + 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; Please define all variables at the begining. > + > + if (speed == USB_SPEED_HIGH) > + descriptors = f->hs_descriptors; > + else > + descriptors = f->descriptors; > + if (!descriptors) > + continue; > + status = usb_descriptor_fillbuf(next, len, > + (const struct usb_descriptor_header **) descriptors); > + if (status < 0) > + return status; > + len -= status; > + next += status; > + } > + > + len = next - buf; > + c->wTotalLength = cpu_to_le16(len); > + return len; > +} > + > +static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) > +{ > + struct usb_gadget *gadget = cdev->gadget; > + struct usb_configuration *c; > + u8 type = w_value >> 8; > + enum usb_device_speed speed = USB_SPEED_UNKNOWN; > + > + if (gadget_is_dualspeed(gadget)) { > + int hs = 0; > + > + if (gadget->speed == USB_SPEED_HIGH) > + hs = 1; > + if (type == USB_DT_OTHER_SPEED_CONFIG) > + hs = !hs; > + if (hs) > + speed = USB_SPEED_HIGH; > + > + } > + > + 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; > + struct usb_configuration *c; > + unsigned count = 0; > + int hs = 0; > + > + if (gadget_is_dualspeed(gadget)) { > + if (gadget->speed == USB_SPEED_HIGH) > + hs = 1; > + if (type == USB_DT_DEVICE_QUALIFIER) > + hs = !hs; > + } > + list_for_each_entry(c, &cdev->configs, list) { > + /* ignore configs that won't work at this speed */ > + if (hs) { > + if (!c->highspeed) > + continue; > + } else { > + if (!c->fullspeed) > + continue; > + } > + count++; > + } > + return count; > +} > + > +static void device_qual(struct usb_composite_dev *cdev) > +{ > + struct usb_qualifier_descriptor *qual = cdev->req->buf; > + > + qual->bLength = sizeof(*qual); > + qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; > + /* POLICY: same bcdUSB and device type info at both speeds */ > + qual->bcdUSB = cdev->desc.bcdUSB; > + qual->bDeviceClass = cdev->desc.bDeviceClass; > + qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; > + qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; > + /* ASSUME same EP0 fifo size at both speeds */ > + qual->bMaxPacketSize0 = cdev->desc.bMaxPacketSize0; > + qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); > + qual->bRESERVED = 0; > +} > + > +static void reset_config(struct usb_composite_dev *cdev) > +{ > + struct usb_function *f; > + > + 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; > + struct usb_configuration *c = NULL; > + int result = -EINVAL; > + unsigned power = gadget_is_otg(gadget) ? 8 : 100; > + int tmp; > + > + if (cdev->config) > + reset_config(cdev); > + > + if (number) { > + list_for_each_entry(c, &cdev->configs, list) { > + if (c->bConfigurationValue == number) { > + result = 0; > + break; > + } > + } > + if (result < 0) > + goto done; > + } else > + result = 0; > + > + 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++) { > + 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. > + */ > + if (gadget->speed == USB_SPEED_HIGH) > + descriptors = f->hs_descriptors; > + else > + 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) { > + 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; > + > + 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 { > + unsigned i; > + > + 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++) { > + struct usb_function *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 > +) > +{ > + struct usb_gadget_strings *s; > + int value; > + > + while (*sp) { > + s = *sp++; > + if (s->language != language) > + continue; > + value = usb_gadget_get_string(s, id, buf); > + if (value > 0) > + return value; > + } > + return -EINVAL; > +} > + > +static int get_string(struct usb_composite_dev *cdev, > + void *buf, u16 language, int id) > +{ > + struct usb_configuration *c; > + struct usb_function *f; > + int len; > + > + /* > + * Yes, not only is USB's I18N support probably more than most > + * folk will ever care about ... also, it's all supported here. > + * (Except for UTF8 support for Unicode's "Astral Planes".) > + */ > + > + /* 0 == report all available language codes */ > + if (id == 0) { > + struct usb_string_descriptor *s = buf; > + struct usb_gadget_strings **sp; > + > + memset(s, 0, 256); > + s->bDescriptorType = USB_DT_STRING; > + > + sp = composite->strings; > + if (sp) > + collect_langs(sp, s->wData); > + > + list_for_each_entry(c, &cdev->configs, list) { > + sp = c->strings; > + if (sp) > + collect_langs(sp, s->wData); > + > + list_for_each_entry(f, &c->functions, list) { > + sp = f->strings; > + if (sp) > + collect_langs(sp, s->wData); > + } > + } > + > + for (len = 0; len <= 126 && s->wData[len]; len++) > + continue; > + if (!len) > + return -EINVAL; > + > + s->bLength = 2 * (len + 1); > + return s->bLength; > + } > + > + /* > + * Otherwise, look up and return a specified string. String IDs > + * are device-scoped, so we look up each string table we're told > + * about. These lookups are infrequent; simpler-is-better here. > + */ > + if (composite->strings) { > + len = lookup_string(composite->strings, buf, language, id); > + if (len > 0) > + return len; > + } > + list_for_each_entry(c, &cdev->configs, list) { > + if (c->strings) { > + len = lookup_string(c->strings, buf, language, id); > + if (len > 0) > + return len; > + } > + list_for_each_entry(f, &c->functions, list) { > + if (!f->strings) > + continue; > + len = lookup_string(f->strings, buf, language, id); > + if (len > 0) > + return len; > + } > + } > + return -EINVAL; > +} > + > +/** > + * usb_string_id() - allocate an unused string ID > + * @cdev: the device whose string descriptor IDs are being allocated > + * Context: single threaded during gadget setup > + * > + * @usb_string_id() is called from bind() callbacks to allocate > + * string IDs. Drivers for functions, configurations, or gadgets will > + * then store that ID in the appropriate descriptors and string table. > + * > + * All string identifier should be allocated using this, > + * @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 (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 (n > 254 || (unsigned)next + n > 254) Why the cast here? Fix also in linux? > + 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) +{ > + struct usb_composite_dev *cdev = get_gadget_data(gadget); > + struct usb_request *req = cdev->req; > + int value = -EOPNOTSUPP; > + 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; > + int standard; > + > + /* > + * 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); > + 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(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; > + } > + > + 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) { > + req->length = value; > + req->zero = value < w_length; > + value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); GFP_ATOMIC? In U-Boot? > + 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); > + > + /* > + * 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. > + */ > + BUG_ON(cdev->config); > + > + while (!list_empty(&cdev->configs)) { > + struct usb_configuration *c; > + > + c = list_first_entry(&cdev->configs, > + struct usb_configuration, list); > + while (!list_empty(&c->functions)) { > + struct usb_function *f; > + > + f = list_first_entry(&c->functions, > + struct usb_function, list); > + list_del(&f->list); > + if (f->unbind) { > + 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) > +{ > + struct usb_composite_dev *cdev; > + int status = -ENOMEM; > + > + 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 = 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; > + > + usb_gadget_set_selfpowered(gadget); > + usb_ep_autoconfig_reset(cdev->gadget); > + > + status = composite->bind(cdev); > + if (status < 0) > + goto fail; > + > + cdev->desc = *composite->dev; > + 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); > +} > diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h > new file mode 100644 > index 0000000..53cb095 > --- /dev/null > +++ b/include/linux/usb/composite.h > @@ -0,0 +1,350 @@ > +/* > + * composite.h -- framework for usb gadgets which are composite devices > + * > + * Copyright (C) 2006-2008 David Brownell > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 > USA + */ > + > +#ifndef __LINUX_USB_COMPOSITE_H > +#define __LINUX_USB_COMPOSITE_H > + > +/* > + * This framework is an optional layer on top of the USB Gadget interface, > + * making it easier to build (a) Composite devices, supporting multiple > + * functions within any single configuration, and (b) Multi-configuration > + * devices, also supporting multiple functions but without necessarily > + * having more than one function per configuration. > + * > + * Example: a device with a single configuration supporting both network > + * link and mass storage functions is a composite device. Those functions > + * might alternatively be packaged in individual configurations, but in > + * the composite model the host can use both functions at the same time. > + */ > + > +#include > +#include > +#include > +#include > + > +struct usb_configuration; > + > +/** > + * struct usb_function - describes one function of a configuration > + * @name: For diagnostics, identifies the function. > + * @strings: tables of strings, keyed by identifiers assigned during > bind() + * and by language IDs provided in control requests > + * @descriptors: Table of full (or low) speed descriptors, using interface > and + * string identifiers assigned during @bind(). If this pointer is > null, + * the function will not be available at full speed (or at low > speed). + * @hs_descriptors: Table of high speed descriptors, using > interface and + * string identifiers assigned during @bind(). If this > pointer is null, + * the function will not be available at high speed. > + * @config: assigned when @usb_add_function() is called; this is the > + * configuration with which this function is associated. > + * @bind: Before the gadget can register, all of its functions bind() to > the + * available resources including string and interface identifiers > used + * in interface or class descriptors; endpoints; I/O buffers; and so > on. + * @unbind: Reverses @bind; called as a side effect of unregistering > the + * driver which added this function. > + * @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may > + * initialize usb_ep.driver data at this time (when it is used). > + * Note that setting an interface to its current altsetting resets > + * interface state, and that all interfaces have a disabled state. > + * @get_alt: Returns the active altsetting. If this is not provided, > + * then only altsetting zero is supported. > + * @disable: (REQUIRED) Indicates the function should be disabled. > Reasons + * include host resetting or reconfiguring the gadget, and > disconnection. + * @setup: Used for interface-specific control requests. > + * @suspend: Notifies functions when the host stops sending USB traffic. > + * @resume: Notifies functions when the host restarts USB traffic. > + * > + * A single USB function uses one or more interfaces, and should in most > + * cases support operation at both full and high speeds. Each function is > + * associated by @usb_add_function() with a one configuration; that > function + * causes @bind() to be called so resources can be allocated as > part of + * setting up a gadget driver. Those resources include > endpoints, which + * should be allocated using @usb_ep_autoconfig(). > + * > + * To support dual speed operation, a function driver provides descriptors > + * for both high and full speed operation. Except in rare cases that > don't + * involve bulk endpoints, each speed needs different endpoint > descriptors. + * > + * Function drivers choose their own strategies for managing instance > data. + * The simplest strategy just declares it "static', which means the > function + * can only be activated once. If the function needs to be > exposed in more + * than one configuration at a given speed, it needs to > support multiple + * usb_function structures (one for each configuration). > + * > + * A more complex strategy might encapsulate a @usb_function structure > inside + * a driver-specific instance structure to allows multiple > activations. An + * example of multiple activations might be a CDC ACM > function that supports + * two or more distinct instances within the same > configuration, providing + * several independent logical data links to a > USB host. > + */ > +struct usb_function { > + const char *name; > + struct usb_gadget_strings **strings; > + struct usb_descriptor_header **descriptors; > + struct usb_descriptor_header **hs_descriptors; > + > + struct usb_configuration *config; > + > + /* REVISIT: bind() functions can be marked __init, which > + * makes trouble for section mismatch analysis. See if > + * we can't restructure things to avoid mismatching. > + * Related: unbind() may kfree() but bind() won't... > + */ > + > + /* configuration management: bind/unbind */ > + int (*bind)(struct usb_configuration *, > + struct usb_function *); > + void (*unbind)(struct usb_configuration *, > + struct usb_function *); > + > + /* runtime state management */ > + int (*set_alt)(struct usb_function *, > + unsigned interface, unsigned alt); > + int (*get_alt)(struct usb_function *, > + unsigned interface); > + void (*disable)(struct usb_function *); > + int (*setup)(struct usb_function *, > + const struct usb_ctrlrequest *); > + void (*suspend)(struct usb_function *); > + void (*resume)(struct usb_function *); > + > + /* private: */ > + /* internals */ > + struct list_head list; > + DECLARE_BITMAP(endpoints, 32); > +}; > + > +int usb_add_function(struct usb_configuration *, struct usb_function *); > + > +int usb_function_deactivate(struct usb_function *); > +int usb_function_activate(struct usb_function *); > + > +int usb_interface_id(struct usb_configuration *, struct usb_function *); > + > +/** > + * ep_choose - select descriptor endpoint at current device speed > + * @g: gadget, connected and running at some speed > + * @hs: descriptor to use for high speed operation > + * @fs: descriptor to use for full or low speed operation > + */ > +static inline struct usb_endpoint_descriptor * > +ep_choose(struct usb_gadget *g, struct usb_endpoint_descriptor *hs, > + struct usb_endpoint_descriptor *fs) > +{ > + if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) > + return hs; > + return fs; > +} > + > +#define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */ > + > +/** > + * struct usb_configuration - represents one gadget configuration > + * @label: For diagnostics, describes the configuration. > + * @strings: Tables of strings, keyed by identifiers assigned during > @bind() + * and by language IDs provided in control requests. > + * @descriptors: Table of descriptors preceding all function descriptors. > + * Examples include OTG and vendor-specific descriptors. > + * @bind: Called from @usb_add_config() to allocate resources unique to > this + * configuration and to call @usb_add_function() for each function > used. + * @unbind: Reverses @bind; called as a side effect of > unregistering the + * driver which added this configuration. > + * @setup: Used to delegate control requests that aren't handled by > standard + * device infrastructure or directed at a specific interface. > + * @bConfigurationValue: Copied into configuration descriptor. > + * @iConfiguration: Copied into configuration descriptor. > + * @bmAttributes: Copied into configuration descriptor. > + * @bMaxPower: Copied into configuration descriptor. > + * @cdev: assigned by @usb_add_config() before calling @bind(); this is > + * the device associated with this configuration. > + * > + * Configurations are building blocks for gadget drivers structured around > + * function drivers. Simple USB gadgets require only one function and one > + * configuration, and handle dual-speed hardware by always providing the > same + * functionality. Slightly more complex gadgets may have more than > one + * single-function configuration at a given speed; or have > configurations + * that only work at one speed. > + * > + * Composite devices are, by definition, ones with configurations which > + * include more than one function. > + * > + * The lifecycle of a usb_configuration includes allocation, > initialization + * of the fields described above, and calling > @usb_add_config() to set up + * internal data and bind it to a specific > device. The configuration's + * @bind() method is then used to initialize > all the functions and then + * call @usb_add_function() for them. > + * > + * Those functions would normally be independant of each other, but that's > + * not mandatory. CDC WMC devices are an example where functions often > + * depend on other functions, with some functions subsidiary to others. > + * Such interdependency may be managed in any way, so long as all of the > + * descriptors complete by the time the composite driver returns from > + * its bind() routine. > + */ > +struct usb_configuration { > + const char *label; > + struct usb_gadget_strings **strings; > + const struct usb_descriptor_header **descriptors; > + > + /* REVISIT: bind() functions can be marked __init, which > + * makes trouble for section mismatch analysis. See if > + * we can't restructure things to avoid mismatching... > + */ > + > + /* configuration management: bind/unbind */ > + int (*bind)(struct usb_configuration *); > + void (*unbind)(struct usb_configuration *); > + int (*setup)(struct usb_configuration *, > + const struct usb_ctrlrequest *); > + > + /* fields in the config descriptor */ > + u8 bConfigurationValue; > + u8 iConfiguration; > + u8 bmAttributes; > + u8 bMaxPower; > + > + struct usb_composite_dev *cdev; > + > + /* private: */ > + /* internals */ > + struct list_head list; > + struct list_head functions; > + u8 next_interface_id; > + unsigned highspeed:1; > + unsigned fullspeed:1; > + struct usb_function *interface[MAX_CONFIG_INTERFACES]; > +}; > + > +int usb_add_config(struct usb_composite_dev *, > + struct usb_configuration *); > + > +/** > + * struct usb_composite_driver - groups configurations into a gadget > + * @name: For diagnostics, identifies the driver. > + * @dev: Template descriptor for the device, including default device > + * identifiers. > + * @strings: tables of strings, keyed by identifiers assigned during > bind() + * and language IDs provided in control requests > + * @bind: (REQUIRED) 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. > + * @unbind: Reverses @bind(); called as a side effect of unregistering > + * this driver. > + * @disconnect: optional driver disconnect method > + * @suspend: Notifies when the host stops sending USB traffic, > + * after function notifications > + * @resume: Notifies configuration when the host restarts USB traffic, > + * before function notifications > + * > + * Devices default to reporting self powered operation. Devices which > rely + * on bus powered operation should report this in their @bind() > method. + * > + * Before returning from @bind, various fields in the template descriptor > + * may be overridden. These include the idVendor/idProduct/bcdDevice > values + * normally to bind the appropriate host side driver, and the > three strings + * (iManufacturer, iProduct, iSerialNumber) normally used > to provide user + * meaningful device identifiers. (The strings will not > be defined unless + * they are defined in @dev and @strings.) The correct > ep0 maxpacket size + * is also reported, as defined by the underlying > controller driver. + */ > +struct usb_composite_driver { > + const char *name; > + const struct usb_device_descriptor *dev; > + struct usb_gadget_strings **strings; > + > + /* REVISIT: bind() functions can be marked __init, which > + * makes trouble for section mismatch analysis. See if > + * we can't restructure things to avoid mismatching... > + */ > + > + int (*bind)(struct usb_composite_dev *); > + int (*unbind)(struct usb_composite_dev *); > + > + void (*disconnect)(struct usb_composite_dev *); > + > + /* global suspend hooks */ > + void (*suspend)(struct usb_composite_dev *); > + void (*resume)(struct usb_composite_dev *); > +}; > + > +extern int usb_composite_register(struct usb_composite_driver *); > +extern void usb_composite_unregister(struct usb_composite_driver *); > + > + > +/** > + * struct usb_composite_device - represents one composite usb gadget > + * @gadget: read-only, abstracts the gadget's usb peripheral controller > + * @req: used for control responses; buffer is pre-allocated > + * @bufsiz: size of buffer pre-allocated in @req > + * @config: the currently active configuration > + * > + * One of these devices is allocated and initialized before the > + * associated device driver's bind() is called. > + * > + * OPEN ISSUE: it appears that some WUSB devices will need to be > + * built by combining a normal (wired) gadget with a wireless one. > + * This revision of the gadget framework should probably try to make > + * sure doing that won't hurt too much. > + * > + * One notion for how to handle Wireless USB devices involves: > + * (a) a second gadget here, discovery mechanism TBD, but likely > + * needing separate "register/unregister WUSB gadget" calls; > + * (b) updates to usb_gadget to include flags "is it wireless", > + * "is it wired", plus (presumably in a wrapper structure) > + * bandgroup and PHY info; > + * (c) presumably a wireless_ep wrapping a usb_ep, and reporting > + * wireless-specific parameters like maxburst and maxsequence; > + * (d) configurations that are specific to wireless links; > + * (e) function drivers that understand wireless configs and will > + * support wireless for (additional) function instances; > + * (f) a function to support association setup (like CBAF), not > + * necessarily requiring a wireless adapter; > + * (g) composite device setup that can create one or more wireless > + * configs, including appropriate association setup support; > + * (h) more, TBD. > + */ > +struct usb_composite_dev { > + struct usb_gadget *gadget; > + struct usb_request *req; > + unsigned bufsiz; > + > + struct usb_configuration *config; > + > + /* private: */ > + /* internals */ > + unsigned int suspended:1; > + struct usb_device_descriptor desc; > + struct list_head configs; > + struct usb_composite_driver *driver; > + u8 next_string_id; > + > + /* the gadget driver won't enable the data pullup > + * while the deactivation count is nonzero. > + */ > + unsigned deactivations; > +}; > + > +extern int usb_string_id(struct usb_composite_dev *c); > +extern int usb_string_ids_tab(struct usb_composite_dev *c, > + struct usb_string *str); > +extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n); > + > +#endif /* __LINUX_USB_COMPOSITE_H */ > diff --git a/include/usb/lin_gadget_compat.h > b/include/usb/lin_gadget_compat.h index fce3be7..01c576a 100644 > --- a/include/usb/lin_gadget_compat.h > +++ b/include/usb/lin_gadget_compat.h > @@ -36,8 +36,8 @@ > #define mutex_lock(...) > #define mutex_unlock(...) > > -#define WARN_ON(x) if (x) {printf("WARNING in %s line %d\n" \ > - , __FILE__, __LINE__); } > +#define WARN_ON(x) do { if (x) printf("WARNING in %s line %d\n" \ > + , __FILE__, __LINE__); } while (0) > > #define KERN_WARNING > #define KERN_ERR > @@ -45,6 +45,7 @@ > #define KERN_DEBUG > > #define GFP_KERNEL 0 > +#define GFP_ATOMIC 0 > > #define IRQ_HANDLED 1 > > @@ -56,6 +57,26 @@ > > #define __iomem > #define min_t min > + > +#define BITS_PER_BYTE 8 > +#define BITS_TO_LONGS(nr) \ > + DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) > +#define DECLARE_BITMAP(name, bits) \ > + unsigned long name[BITS_TO_LONGS(bits)] > + > +#define small_const_nbits(nbits) \ > + (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG) > + > +static inline void bitmap_zero(unsigned long *dst, int nbits) > +{ > + if (small_const_nbits(nbits)) > + *dst = 0UL; > + else { > + int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); > + memset(dst, 0, len); > + } > +} > + > #define dma_cache_maint(addr, size, mode) cache_flush() > void cache_flush(void);