u-boot/drivers/usb/gadget/composite.c
Sam Protsenko 8038f6d288 usb: gadget: composite: Correct recovery path for register
In case when usb_composite_register() failed once (for whatever reason),
it will fail further even if all conditions are correct. Example:

    => fastboot 2
    Invalid Controller Index
    couldn't find an available UDC
    g_dnl_register: failed!, error: -19
    exit not allowed from main input shell.

    => fastboot 0
    g_dnl_register: failed!, error: -22
    exit not allowed from main input shell.

Despite that 0 is correct index for USB controller, "fastboot 0" command
will fail, because "composite" structure wasn't cleared properly on
previous fail (on "fastboot 2" command).

This patch fixes that erroneous behavior, allowing us to use composite
even after previous failure.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
2016-03-01 14:47:26 +01:00

1109 lines
29 KiB
C

/*
* composite.c - infrastructure for Composite USB Gadgets
*
* Copyright (C) 2006-2008 David Brownell
* U-Boot porting: Lukasz Majewski <l.majewski@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#undef DEBUG
#include <linux/bitops.h>
#include <linux/usb/composite.h>
#define USB_BUFSIZ 4096
static struct usb_composite_driver *composite;
/**
* usb_add_function() - add a function to a configuration
* @config: the configuration
* @function: the function being added
* Context: single threaded during gadget setup
*
* After initialization, each configuration must have one or more
* functions added to it. Adding a function involves calling its @bind()
* method to allocate resources such as interface and string identifiers
* and endpoints.
*
* This function returns the value of the function's bind(), which is
* zero for success else a negative errno value.
*/
int usb_add_function(struct usb_configuration *config,
struct usb_function *function)
{
int value = -EINVAL;
debug("adding '%s'/%p to config '%s'/%p\n",
function->name, function,
config->label, config);
if (!function->set_alt || !function->disable)
goto done;
function->config = config;
list_add_tail(&function->list, &config->functions);
if (function->bind) {
value = function->bind(config, function);
if (value < 0) {
list_del(&function->list);
function->config = NULL;
}
} else
value = 0;
if (!config->fullspeed && function->descriptors)
config->fullspeed = 1;
if (!config->highspeed && function->hs_descriptors)
config->highspeed = 1;
done:
if (value)
debug("adding '%s'/%p --> %d\n",
function->name, function, value);
return value;
}
/**
* usb_function_deactivate - prevent function and gadget enumeration
* @function: the function that isn't yet ready to respond
*
* Blocks response of the gadget driver to host enumeration by
* preventing the data line pullup from being activated. This is
* normally called during @bind() processing to change from the
* initial "ready to respond" state, or when a required resource
* becomes available.
*
* For example, drivers that serve as a passthrough to a userspace
* daemon can block enumeration unless that daemon (such as an OBEX,
* MTP, or print server) is ready to handle host requests.
*
* Not all systems support software control of their USB peripheral
* data pullups.
*
* Returns zero on success, else negative errno.
*/
int usb_function_deactivate(struct usb_function *function)
{
struct usb_composite_dev *cdev = function->config->cdev;
int status = 0;
if (cdev->deactivations == 0)
status = usb_gadget_disconnect(cdev->gadget);
if (status == 0)
cdev->deactivations++;
return status;
}
/**
* usb_function_activate - allow function and gadget enumeration
* @function: function on which usb_function_activate() was called
*
* Reverses effect of usb_function_deactivate(). If no more functions
* are delaying their activation, the gadget driver will respond to
* host enumeration procedures.
*
* Returns zero on success, else negative errno.
*/
int usb_function_activate(struct usb_function *function)
{
struct usb_composite_dev *cdev = function->config->cdev;
int status = 0;
if (cdev->deactivations == 0)
status = -EINVAL;
else {
cdev->deactivations--;
if (cdev->deactivations == 0)
status = usb_gadget_connect(cdev->gadget);
}
return status;
}
/**
* usb_interface_id() - allocate an unused interface ID
* @config: configuration associated with the interface
* @function: function handling the interface
* Context: single threaded during gadget setup
*
* usb_interface_id() is called from usb_function.bind() callbacks to
* allocate new interface IDs. The function driver will then store that
* ID in interface, association, CDC union, and other descriptors. It
* will also handle any control requests targetted at that interface,
* particularly changing its altsetting via set_alt(). There may
* also be class-specific or vendor-specific requests to handle.
*
* All interface identifier should be allocated using this routine, to
* ensure that for example different functions don't wrongly assign
* different meanings to the same identifier. Note that since interface
* identifers are configuration-specific, functions used in more than
* one configuration (or more than once in a given configuration) need
* multiple versions of the relevant descriptors.
*
* Returns the interface ID which was allocated; or -ENODEV if no
* more interface IDs can be allocated.
*/
int usb_interface_id(struct usb_configuration *config,
struct usb_function *function)
{
unsigned char id = config->next_interface_id;
if (id < MAX_CONFIG_INTERFACES) {
config->interface[id] = function;
config->next_interface_id = id + 1;
return id;
}
return -ENODEV;
}
static int config_buf(struct usb_configuration *config,
enum usb_device_speed speed, void *buf, u8 type)
{
int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE;
void *next = buf + USB_DT_CONFIG_SIZE;
struct usb_descriptor_header **descriptors;
struct usb_config_descriptor *c = buf;
int status;
struct usb_function *f;
/* write the config descriptor */
c = buf;
c->bLength = USB_DT_CONFIG_SIZE;
c->bDescriptorType = type;
c->bNumInterfaces = config->next_interface_id;
c->bConfigurationValue = config->bConfigurationValue;
c->iConfiguration = config->iConfiguration;
c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2);
/* There may be e.g. OTG descriptors */
if (config->descriptors) {
status = usb_descriptor_fillbuf(next, len,
config->descriptors);
if (status < 0)
return status;
len -= status;
next += status;
}
/* add each function's descriptors */
list_for_each_entry(f, &config->functions, list) {
if (speed == USB_SPEED_HIGH)
descriptors = f->hs_descriptors;
else
descriptors = f->descriptors;
if (!descriptors)
continue;
status = usb_descriptor_fillbuf(next, len,
(const struct usb_descriptor_header **) descriptors);
if (status < 0)
return status;
len -= status;
next += status;
}
len = next - buf;
c->wTotalLength = cpu_to_le16(len);
return len;
}
static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
{
enum usb_device_speed speed = USB_SPEED_UNKNOWN;
struct usb_gadget *gadget = cdev->gadget;
u8 type = w_value >> 8;
int hs = 0;
struct usb_configuration *c;
if (gadget_is_dualspeed(gadget)) {
if (gadget->speed == USB_SPEED_HIGH)
hs = 1;
if (type == USB_DT_OTHER_SPEED_CONFIG)
hs = !hs;
if (hs)
speed = USB_SPEED_HIGH;
}
w_value &= 0xff;
list_for_each_entry(c, &cdev->configs, list) {
if (speed == USB_SPEED_HIGH) {
if (!c->highspeed)
continue;
} else {
if (!c->fullspeed)
continue;
}
if (w_value == 0)
return config_buf(c, speed, cdev->req->buf, type);
w_value--;
}
return -EINVAL;
}
static int count_configs(struct usb_composite_dev *cdev, unsigned type)
{
struct usb_gadget *gadget = cdev->gadget;
unsigned count = 0;
int hs = 0;
struct usb_configuration *c;
if (gadget_is_dualspeed(gadget)) {
if (gadget->speed == USB_SPEED_HIGH)
hs = 1;
if (type == USB_DT_DEVICE_QUALIFIER)
hs = !hs;
}
list_for_each_entry(c, &cdev->configs, list) {
/* ignore configs that won't work at this speed */
if (hs) {
if (!c->highspeed)
continue;
} else {
if (!c->fullspeed)
continue;
}
count++;
}
return count;
}
static void device_qual(struct usb_composite_dev *cdev)
{
struct usb_qualifier_descriptor *qual = cdev->req->buf;
qual->bLength = sizeof(*qual);
qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
/* POLICY: same bcdUSB and device type info at both speeds */
qual->bcdUSB = cdev->desc.bcdUSB;
qual->bDeviceClass = cdev->desc.bDeviceClass;
qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
/* ASSUME same EP0 fifo size at both speeds */
qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
qual->bRESERVED = 0;
}
static void reset_config(struct usb_composite_dev *cdev)
{
struct usb_function *f;
debug("%s:\n", __func__);
list_for_each_entry(f, &cdev->config->functions, list) {
if (f->disable)
f->disable(f);
bitmap_zero(f->endpoints, 32);
}
cdev->config = NULL;
}
static int set_config(struct usb_composite_dev *cdev,
const struct usb_ctrlrequest *ctrl, unsigned number)
{
struct usb_gadget *gadget = cdev->gadget;
unsigned power = gadget_is_otg(gadget) ? 8 : 100;
struct usb_descriptor_header **descriptors;
int result = -EINVAL;
struct usb_endpoint_descriptor *ep;
struct usb_configuration *c = NULL;
int addr;
int tmp;
struct usb_function *f;
if (cdev->config)
reset_config(cdev);
if (number) {
list_for_each_entry(c, &cdev->configs, list) {
if (c->bConfigurationValue == number) {
result = 0;
break;
}
}
if (result < 0)
goto done;
} else
result = 0;
debug("%s: %s speed config #%d: %s\n", __func__,
({ char *speed;
switch (gadget->speed) {
case USB_SPEED_LOW:
speed = "low";
break;
case USB_SPEED_FULL:
speed = "full";
break;
case USB_SPEED_HIGH:
speed = "high";
break;
default:
speed = "?";
break;
};
speed;
}), number, c ? c->label : "unconfigured");
if (!c)
goto done;
cdev->config = c;
/* Initialize all interfaces by setting them to altsetting zero. */
for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
f = c->interface[tmp];
if (!f)
break;
/*
* Record which endpoints are used by the function. This is used
* to dispatch control requests targeted at that endpoint to the
* function's setup callback instead of the current
* configuration's setup callback.
*/
if (gadget->speed == USB_SPEED_HIGH)
descriptors = f->hs_descriptors;
else
descriptors = f->descriptors;
for (; *descriptors; ++descriptors) {
if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
continue;
ep = (struct usb_endpoint_descriptor *)*descriptors;
addr = ((ep->bEndpointAddress & 0x80) >> 3)
| (ep->bEndpointAddress & 0x0f);
__set_bit(addr, f->endpoints);
}
result = f->set_alt(f, tmp, 0);
if (result < 0) {
debug("interface %d (%s/%p) alt 0 --> %d\n",
tmp, f->name, f, result);
reset_config(cdev);
goto done;
}
}
/* when we return, be sure our power usage is valid */
power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW;
done:
usb_gadget_vbus_draw(gadget, power);
return result;
}
/**
* usb_add_config() - add a configuration to a device.
* @cdev: wraps the USB gadget
* @config: the configuration, with bConfigurationValue assigned
* Context: single threaded during gadget setup
*
* One of the main tasks of a composite driver's bind() routine is to
* add each of the configurations it supports, using this routine.
*
* This function returns the value of the configuration's bind(), which
* is zero for success else a negative errno value. Binding configurations
* assigns global resources including string IDs, and per-configuration
* resources such as interface IDs and endpoints.
*/
int usb_add_config(struct usb_composite_dev *cdev,
struct usb_configuration *config)
{
int status = -EINVAL;
struct usb_configuration *c;
struct usb_function *f;
unsigned int i;
debug("%s: adding config #%u '%s'/%p\n", __func__,
config->bConfigurationValue,
config->label, config);
if (!config->bConfigurationValue || !config->bind)
goto done;
/* Prevent duplicate configuration identifiers */
list_for_each_entry(c, &cdev->configs, list) {
if (c->bConfigurationValue == config->bConfigurationValue) {
status = -EBUSY;
goto done;
}
}
config->cdev = cdev;
list_add_tail(&config->list, &cdev->configs);
INIT_LIST_HEAD(&config->functions);
config->next_interface_id = 0;
status = config->bind(config);
if (status < 0) {
list_del(&config->list);
config->cdev = NULL;
} else {
debug("cfg %d/%p speeds:%s%s\n",
config->bConfigurationValue, config,
config->highspeed ? " high" : "",
config->fullspeed
? (gadget_is_dualspeed(cdev->gadget)
? " full"
: " full/low")
: "");
for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
f = config->interface[i];
if (!f)
continue;
debug("%s: interface %d = %s/%p\n",
__func__, i, f->name, f);
}
}
usb_ep_autoconfig_reset(cdev->gadget);
done:
if (status)
debug("added config '%s'/%u --> %d\n", config->label,
config->bConfigurationValue, status);
return status;
}
/*
* We support strings in multiple languages ... string descriptor zero
* says which languages are supported. The typical case will be that
* only one language (probably English) is used, with I18N handled on
* the host side.
*/
static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
{
const struct usb_gadget_strings *s;
u16 language;
__le16 *tmp;
while (*sp) {
s = *sp;
language = cpu_to_le16(s->language);
for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) {
if (*tmp == language)
goto repeat;
}
*tmp++ = language;
repeat:
sp++;
}
}
static int lookup_string(
struct usb_gadget_strings **sp,
void *buf,
u16 language,
int id
)
{
int value;
struct usb_gadget_strings *s;
while (*sp) {
s = *sp++;
if (s->language != language)
continue;
value = usb_gadget_get_string(s, id, buf);
if (value > 0)
return value;
}
return -EINVAL;
}
static int get_string(struct usb_composite_dev *cdev,
void *buf, u16 language, int id)
{
struct usb_string_descriptor *s = buf;
struct usb_gadget_strings **sp;
int len;
struct usb_configuration *c;
struct usb_function *f;
/*
* Yes, not only is USB's I18N support probably more than most
* folk will ever care about ... also, it's all supported here.
* (Except for UTF8 support for Unicode's "Astral Planes".)
*/
/* 0 == report all available language codes */
if (id == 0) {
memset(s, 0, 256);
s->bDescriptorType = USB_DT_STRING;
sp = composite->strings;
if (sp)
collect_langs(sp, s->wData);
list_for_each_entry(c, &cdev->configs, list) {
sp = c->strings;
if (sp)
collect_langs(sp, s->wData);
list_for_each_entry(f, &c->functions, list) {
sp = f->strings;
if (sp)
collect_langs(sp, s->wData);
}
}
for (len = 0; len <= 126 && s->wData[len]; len++)
continue;
if (!len)
return -EINVAL;
s->bLength = 2 * (len + 1);
return s->bLength;
}
/*
* Otherwise, look up and return a specified string. String IDs
* are device-scoped, so we look up each string table we're told
* about. These lookups are infrequent; simpler-is-better here.
*/
if (composite->strings) {
len = lookup_string(composite->strings, buf, language, id);
if (len > 0)
return len;
}
list_for_each_entry(c, &cdev->configs, list) {
if (c->strings) {
len = lookup_string(c->strings, buf, language, id);
if (len > 0)
return len;
}
list_for_each_entry(f, &c->functions, list) {
if (!f->strings)
continue;
len = lookup_string(f->strings, buf, language, id);
if (len > 0)
return len;
}
}
return -EINVAL;
}
/**
* usb_string_id() - allocate an unused string ID
* @cdev: the device whose string descriptor IDs are being allocated
* Context: single threaded during gadget setup
*
* @usb_string_id() is called from bind() callbacks to allocate
* string IDs. Drivers for functions, configurations, or gadgets will
* then store that ID in the appropriate descriptors and string table.
*
* All string identifier should be allocated using this,
* @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
* that for example different functions don't wrongly assign different
* meanings to the same identifier.
*/
int usb_string_id(struct usb_composite_dev *cdev)
{
if (cdev->next_string_id < 254) {
/*
* string id 0 is reserved by USB spec for list of
* supported languages
* 255 reserved as well? -- mina86
*/
cdev->next_string_id++;
return cdev->next_string_id;
}
return -ENODEV;
}
/**
* usb_string_ids() - allocate unused string IDs in batch
* @cdev: the device whose string descriptor IDs are being allocated
* @str: an array of usb_string objects to assign numbers to
* Context: single threaded during gadget setup
*
* @usb_string_ids() is called from bind() callbacks to allocate
* string IDs. Drivers for functions, configurations, or gadgets will
* then copy IDs from the string table to the appropriate descriptors
* and string table for other languages.
*
* All string identifier should be allocated using this,
* @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
* example different functions don't wrongly assign different meanings
* to the same identifier.
*/
int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
{
u8 next = cdev->next_string_id;
for (; str->s; ++str) {
if (next >= 254)
return -ENODEV;
str->id = ++next;
}
cdev->next_string_id = next;
return 0;
}
/**
* usb_string_ids_n() - allocate unused string IDs in batch
* @c: the device whose string descriptor IDs are being allocated
* @n: number of string IDs to allocate
* Context: single threaded during gadget setup
*
* Returns the first requested ID. This ID and next @n-1 IDs are now
* valid IDs. At least provided that @n is non-zero because if it
* is, returns last requested ID which is now very useful information.
*
* @usb_string_ids_n() is called from bind() callbacks to allocate
* string IDs. Drivers for functions, configurations, or gadgets will
* then store that ID in the appropriate descriptors and string table.
*
* All string identifier should be allocated using this,
* @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
* example different functions don't wrongly assign different meanings
* to the same identifier.
*/
int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
{
u8 next = c->next_string_id;
if (n > 254 || next + n > 254)
return -ENODEV;
c->next_string_id += n;
return next + 1;
}
static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
{
if (req->status || req->actual != req->length)
debug("%s: setup complete --> %d, %d/%d\n", __func__,
req->status, req->actual, req->length);
}
/*
* The setup() callback implements all the ep0 functionality that's
* not handled lower down, in hardware or the hardware driver(like
* device and endpoint feature flags, and their status). It's all
* housekeeping for the gadget function we're implementing. Most of
* the work is in config and function specific setup.
*/
static int
composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
{
u16 w_length = le16_to_cpu(ctrl->wLength);
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
struct usb_composite_dev *cdev = get_gadget_data(gadget);
u8 intf = w_index & 0xFF;
int value = -EOPNOTSUPP;
struct usb_request *req = cdev->req;
struct usb_function *f = NULL;
int standard;
u8 endp;
struct usb_configuration *c;
/*
* partial re-init of the response message; the function or the
* gadget might need to intercept e.g. a control-OUT completion
* when we delegate to it.
*/
req->zero = 0;
req->complete = composite_setup_complete;
req->length = USB_BUFSIZ;
gadget->ep0->driver_data = cdev;
standard = (ctrl->bRequestType & USB_TYPE_MASK)
== USB_TYPE_STANDARD;
if (!standard)
goto unknown;
switch (ctrl->bRequest) {
/* we handle all standard USB descriptors */
case USB_REQ_GET_DESCRIPTOR:
if (ctrl->bRequestType != USB_DIR_IN)
goto unknown;
switch (w_value >> 8) {
case USB_DT_DEVICE:
cdev->desc.bNumConfigurations =
count_configs(cdev, USB_DT_DEVICE);
cdev->desc.bMaxPacketSize0 =
cdev->gadget->ep0->maxpacket;
value = min(w_length, (u16) sizeof cdev->desc);
memcpy(req->buf, &cdev->desc, value);
break;
case USB_DT_DEVICE_QUALIFIER:
if (!gadget_is_dualspeed(gadget))
break;
device_qual(cdev);
value = min_t(int, w_length,
sizeof(struct usb_qualifier_descriptor));
break;
case USB_DT_OTHER_SPEED_CONFIG:
if (!gadget_is_dualspeed(gadget))
break;
case USB_DT_CONFIG:
value = config_desc(cdev, w_value);
if (value >= 0)
value = min(w_length, (u16) value);
break;
case USB_DT_STRING:
value = get_string(cdev, req->buf,
w_index, w_value & 0xff);
if (value >= 0)
value = min(w_length, (u16) value);
break;
case USB_DT_BOS:
/*
* The USB compliance test (USB 2.0 Command Verifier)
* issues this request. We should not run into the
* default path here. But return for now until
* the superspeed support is added.
*/
break;
default:
goto unknown;
}
break;
/* any number of configs can work */
case USB_REQ_SET_CONFIGURATION:
if (ctrl->bRequestType != 0)
goto unknown;
if (gadget_is_otg(gadget)) {
if (gadget->a_hnp_support)
debug("HNP available\n");
else if (gadget->a_alt_hnp_support)
debug("HNP on another port\n");
else
debug("HNP inactive\n");
}
value = set_config(cdev, ctrl, w_value);
break;
case USB_REQ_GET_CONFIGURATION:
if (ctrl->bRequestType != USB_DIR_IN)
goto unknown;
if (cdev->config)
*(u8 *)req->buf = cdev->config->bConfigurationValue;
else
*(u8 *)req->buf = 0;
value = min(w_length, (u16) 1);
break;
/*
* function drivers must handle get/set altsetting; if there's
* no get() method, we know only altsetting zero works.
*/
case USB_REQ_SET_INTERFACE:
if (ctrl->bRequestType != USB_RECIP_INTERFACE)
goto unknown;
if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
if (!f)
break;
if (w_value && !f->set_alt)
break;
value = f->set_alt(f, w_index, w_value);
break;
case USB_REQ_GET_INTERFACE:
if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
goto unknown;
if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES)
break;
f = cdev->config->interface[intf];
if (!f)
break;
/* lots of interfaces only need altsetting zero... */
value = f->get_alt ? f->get_alt(f, w_index) : 0;
if (value < 0)
break;
*((u8 *)req->buf) = value;
value = min(w_length, (u16) 1);
break;
default:
unknown:
debug("non-core control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
/*
* functions always handle their interfaces and endpoints...
* punt other recipients (other, WUSB, ...) to the current
* configuration code.
*/
switch (ctrl->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_INTERFACE:
f = cdev->config->interface[intf];
break;
case USB_RECIP_ENDPOINT:
endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
list_for_each_entry(f, &cdev->config->functions, list) {
if (test_bit(endp, f->endpoints))
break;
}
if (&f->list == &cdev->config->functions)
f = NULL;
break;
/*
* dfu-util (version 0.5) sets bmRequestType.Receipent = Device
* for non-standard request (w_value = 0x21,
* bRequest = GET_DESCRIPTOR in this case).
* When only one interface is registered (as it is done now),
* then this request shall be handled as it was requested for
* interface.
*
* In the below code it is checked if only one interface is
* present and proper function for it is extracted. Due to that
* function's setup (f->setup) is called to handle this
* special non-standard request.
*/
case USB_RECIP_DEVICE:
debug("cdev->config->next_interface_id: %d intf: %d\n",
cdev->config->next_interface_id, intf);
if (cdev->config->next_interface_id == 1)
f = cdev->config->interface[intf];
break;
}
if (f && f->setup)
value = f->setup(f, ctrl);
else {
c = cdev->config;
if (c && c->setup)
value = c->setup(c, ctrl);
}
goto done;
}
/* respond with data transfer before status phase? */
if (value >= 0) {
req->length = value;
req->zero = value < w_length;
value = usb_ep_queue(gadget->ep0, req, GFP_KERNEL);
if (value < 0) {
debug("ep_queue --> %d\n", value);
req->status = 0;
composite_setup_complete(gadget->ep0, req);
}
}
done:
/* device either stalls (value < 0) or reports success */
return value;
}
static void composite_disconnect(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
if (cdev->config)
reset_config(cdev);
if (composite->disconnect)
composite->disconnect(cdev);
}
static void composite_unbind(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_configuration *c;
struct usb_function *f;
/*
* composite_disconnect() must already have been called
* by the underlying peripheral controller driver!
* so there's no i/o concurrency that could affect the
* state protected by cdev->lock.
*/
BUG_ON(cdev->config);
while (!list_empty(&cdev->configs)) {
c = list_first_entry(&cdev->configs,
struct usb_configuration, list);
while (!list_empty(&c->functions)) {
f = list_first_entry(&c->functions,
struct usb_function, list);
list_del(&f->list);
if (f->unbind) {
debug("unbind function '%s'/%p\n",
f->name, f);
f->unbind(c, f);
}
}
list_del(&c->list);
if (c->unbind) {
debug("unbind config '%s'/%p\n", c->label, c);
c->unbind(c);
}
free(c);
}
if (composite->unbind)
composite->unbind(cdev);
if (cdev->req) {
kfree(cdev->req->buf);
usb_ep_free_request(gadget->ep0, cdev->req);
}
kfree(cdev);
set_gadget_data(gadget, NULL);
composite = NULL;
}
static int composite_bind(struct usb_gadget *gadget)
{
int status = -ENOMEM;
struct usb_composite_dev *cdev;
cdev = calloc(sizeof *cdev, 1);
if (!cdev)
return status;
cdev->gadget = gadget;
set_gadget_data(gadget, cdev);
INIT_LIST_HEAD(&cdev->configs);
/* preallocate control response and buffer */
cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
if (!cdev->req)
goto fail;
cdev->req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, USB_BUFSIZ);
if (!cdev->req->buf)
goto fail;
cdev->req->complete = composite_setup_complete;
gadget->ep0->driver_data = cdev;
cdev->bufsiz = USB_BUFSIZ;
cdev->driver = composite;
usb_gadget_set_selfpowered(gadget);
usb_ep_autoconfig_reset(cdev->gadget);
status = composite->bind(cdev);
if (status < 0)
goto fail;
memcpy(&cdev->desc, composite->dev,
sizeof(struct usb_device_descriptor));
cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
debug("%s: ready\n", composite->name);
return 0;
fail:
composite_unbind(gadget);
return status;
}
static void
composite_suspend(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_function *f;
debug("%s: suspend\n", __func__);
if (cdev->config) {
list_for_each_entry(f, &cdev->config->functions, list) {
if (f->suspend)
f->suspend(f);
}
}
if (composite->suspend)
composite->suspend(cdev);
cdev->suspended = 1;
}
static void
composite_resume(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_function *f;
debug("%s: resume\n", __func__);
if (composite->resume)
composite->resume(cdev);
if (cdev->config) {
list_for_each_entry(f, &cdev->config->functions, list) {
if (f->resume)
f->resume(f);
}
}
cdev->suspended = 0;
}
static struct usb_gadget_driver composite_driver = {
.speed = USB_SPEED_HIGH,
.bind = composite_bind,
.unbind = composite_unbind,
.setup = composite_setup,
.reset = composite_disconnect,
.disconnect = composite_disconnect,
.suspend = composite_suspend,
.resume = composite_resume,
};
/**
* usb_composite_register() - register a composite driver
* @driver: the driver to register
* Context: single threaded during gadget setup
*
* This function is used to register drivers using the composite driver
* framework. The return value is zero, or a negative errno value.
* Those values normally come from the driver's @bind method, which does
* all the work of setting up the driver to match the hardware.
*
* On successful return, the gadget is ready to respond to requests from
* the host, unless one of its components invokes usb_gadget_disconnect()
* while it was binding. That would usually be done in order to wait for
* some userspace participation.
*/
int usb_composite_register(struct usb_composite_driver *driver)
{
int res;
if (!driver || !driver->dev || !driver->bind || composite)
return -EINVAL;
if (!driver->name)
driver->name = "composite";
composite = driver;
res = usb_gadget_register_driver(&composite_driver);
if (res != 0)
composite = NULL;
return res;
}
/**
* usb_composite_unregister() - unregister a composite driver
* @driver: the driver to unregister
*
* This function is used to unregister drivers using the composite
* driver framework.
*/
void usb_composite_unregister(struct usb_composite_driver *driver)
{
if (composite != driver)
return;
usb_gadget_unregister_driver(&composite_driver);
composite = NULL;
}