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composite.c
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/*
* 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.
*/
static struct usb_gadget_strings **get_containers_gs(
struct usb_gadget_string_container *uc)
{
return (struct usb_gadget_strings **)uc->stash;
}
/**
* 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->fs_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;
}
EXPORT_SYMBOL_GPL(config_ep_by_speed);
/**
* 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->fs_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;
}
EXPORT_SYMBOL_GPL(usb_add_function);
void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
{
if (f->disable)
f->disable(f);
bitmap_zero(f->endpoints, 32);
list_del(&f->list);
if (f->unbind)
f->unbind(c, f);
}
EXPORT_SYMBOL_GPL(usb_remove_function);
/**
* 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;
}
EXPORT_SYMBOL_GPL(usb_function_deactivate);
/**
* 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;
}
EXPORT_SYMBOL_GPL(usb_function_activate);
/**
* 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;
}
EXPORT_SYMBOL_GPL(usb_interface_id);
static u8 encode_bMaxPower(enum usb_device_speed speed,
struct usb_configuration *c)
{
unsigned val;
if (c->MaxPower)
val = c->MaxPower;
else
val = CONFIG_USB_GADGET_VBUS_DRAW;
if (!val)
return 0;
switch (speed) {
case USB_SPEED_SUPER:
return DIV_ROUND_UP(val, 8);
default:
return DIV_ROUND_UP(val, 2);
}
}
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;
struct usb_function *f;
int status;
len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
/* 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 = encode_bMaxPower(speed, config);
/* 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->fs_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;
cdev->delayed_status = 0;
}
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->fs_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->MaxPower ? c->MaxPower : 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;
}
int usb_add_config_only(struct usb_composite_dev *cdev,
struct usb_configuration *config)
{
struct usb_configuration *c;
if (!config->bConfigurationValue)
return -EINVAL;
/* Prevent duplicate configuration identifiers */
list_for_each_entry(c, &cdev->configs, list) {
if (c->bConfigurationValue == config->bConfigurationValue)
return -EBUSY;
}
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));
return 0;
}
EXPORT_SYMBOL_GPL(usb_add_config_only);
/**
* 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;
if (!bind)
goto done;
DBG(cdev, "adding config #%u '%s'/%p\n",
config->bConfigurationValue,
config->label, config);
status = usb_add_config_only(cdev, config);
if (status)
goto done;
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;
}
EXPORT_SYMBOL_GPL(usb_add_config);
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_composite_driver *composite = cdev->driver;
struct usb_gadget_string_container *uc;
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);
}
}
list_for_each_entry(uc, &cdev->gstrings, list) {
struct usb_gadget_strings **sp;
sp = get_containers_gs(uc);
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;
}
list_for_each_entry(uc, &cdev->gstrings, list) {
struct usb_gadget_strings **sp;
sp = get_containers_gs(uc);
len = lookup_string(sp, buf, language, id);
if (len > 0)
return len;
}
/* 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