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USB: gadget: f_accessory: Add new gadget driver for android USB accesories.

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This commit is contained in:
tytung 2011-09-24 19:31:58 +08:00
parent a11a1a886e
commit bcd275a3ef
8 changed files with 940 additions and 0 deletions
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1
arch/arm/configs/htcleo_defconfig
View File

@ -1435,6 +1435,7 @@ CONFIG_USB_ANDROID_DIAG=y
CONFIG_USB_ANDROID_MASS_STORAGE=y
CONFIG_USB_ANDROID_RNDIS=y
CONFIG_USB_ANDROID_RNDIS_WCEIS=y
CONFIG_USB_ANDROID_ACCESSORY=y
CONFIG_USB_ANDROID_SERIAL=y
# CONFIG_USB_ANDROID_PROJECTOR is not set
# CONFIG_USB_ANDROID_MTP is not set

28
arch/arm/mach-msm/include/mach/htc_usb.h
View File

@ -16,6 +16,7 @@
#ifdef CONFIG_USB_ANDROID
#include <linux/usb/android_composite.h>
#include <linux/usb/f_accessory.h>
#ifdef CONFIG_ARCH_QSD8X50
void msm_hsusb_8x50_phy_reset(void);
@ -40,6 +41,16 @@ static char *usb_functions_rndis_adb[] = {
};
#endif
#ifdef CONFIG_USB_ANDROID_ACCESSORY
static char *usb_functions_accessory[] = {
"accessory"
};
static char *usb_functions_accessory_adb[] = {
"accessory",
"adb"
};
#endif
#ifdef CONFIG_USB_ANDROID_PROJECTOR
static char *usb_functions_projector[] = {
"usb_mass_storage",
@ -116,6 +127,9 @@ static char *usb_functions_all[] = {
#ifdef CONFIG_USB_ANDROID_RNDIS
"rndis",
#endif
#ifdef CONFIG_USB_ANDROID_ACCESSORY
"accessory",
#endif
#ifdef CONFIG_USB_ANDROID_MTP
"mtp",
#endif
@ -225,6 +239,20 @@ static struct android_usb_product usb_products[] = {
.functions = usb_functions_rndis_adb,
},
#endif
#ifdef CONFIG_USB_ANDROID_ACCESSORY
{
.vendor_id = USB_ACCESSORY_VENDOR_ID,
.product_id = USB_ACCESSORY_PRODUCT_ID,
.num_functions = ARRAY_SIZE(usb_functions_accessory),
.functions = usb_functions_accessory,
},
{
.vendor_id = USB_ACCESSORY_VENDOR_ID,
.product_id = USB_ACCESSORY_ADB_PRODUCT_ID,
.num_functions = ARRAY_SIZE(usb_functions_accessory_adb),
.functions = usb_functions_accessory_adb,
},
#endif
};
#endif

6
drivers/usb/gadget/Kconfig
View File

@ -845,6 +845,12 @@ config USB_ANDROID_RNDIS_WCEIS
If you enable this option, the device is no longer CDC ethernet
compatible.
config USB_ANDROID_ACCESSORY
boolean "Android USB accessory function"
depends on USB_ANDROID
help
Provides Android USB Accessory support for android gadget driver.
config USB_ANDROID_SERIAL
boolean "Android gadget Serial function"
depends on USB_ANDROID

1
drivers/usb/gadget/Makefile
View File

@ -58,6 +58,7 @@ obj-$(CONFIG_USB_ANDROID_ACM) += f_acm.o u_serial.o
obj-$(CONFIG_USB_ANDROID_ADB) += f_adb.o
obj-$(CONFIG_USB_ANDROID_MASS_STORAGE) += f_mass_storage.o
obj-$(CONFIG_USB_ANDROID_RNDIS) += f_rndis.o u_ether.o
obj-$(CONFIG_USB_ANDROID_ACCESSORY) += f_accessory.o
obj-$(CONFIG_USB_ANDROID_SERIAL) += serial.o u_serial.o
obj-$(CONFIG_USB_ANDROID_PROJECTOR) += f_projector.o
obj-$(CONFIG_USB_ANDROID_MTP) += f_mtp.o

14
drivers/usb/gadget/android.c
View File

@ -527,6 +527,20 @@ void android_enable_function(struct usb_function *f, int enable)
}
}
#endif
#ifdef CONFIG_USB_ANDROID_ACCESSORY
if (!strcmp(f->name, "accessory") && enable) {
struct usb_function *func;
/* disable everything else (and keep adb for now) */
list_for_each_entry(func, &android_config_driver.functions, list) {
if (strcmp(func->name, "accessory")
&& strcmp(func->name, "adb")) {
f->hidden = enable;
break;
}
}
}
#endif
product_id = get_product_id(dev);
device_desc.idProduct = __constant_cpu_to_le16(product_id);

808
drivers/usb/gadget/f_accessory.c Normal file
View File

@ -0,0 +1,808 @@
/*
* Gadget Function Driver for Android USB accessories
*
* Copyright (C) 2011 Google, Inc.
* Author: Mike Lockwood <lockwood@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
/* #define DEBUG */
/* #define VERBOSE_DEBUG */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/types.h>
#include <linux/file.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/android_composite.h>
#include <linux/usb/f_accessory.h>
#define BULK_BUFFER_SIZE 16384
#define ACC_STRING_SIZE 256
#define PROTOCOL_VERSION 1
/* String IDs */
#define INTERFACE_STRING_INDEX 0
/* number of tx and rx requests to allocate */
#define TX_REQ_MAX 4
#define RX_REQ_MAX 2
struct acc_dev {
struct usb_function function;
struct usb_composite_dev *cdev;
spinlock_t lock;
struct usb_ep *ep_in;
struct usb_ep *ep_out;
/* set to 1 when we connect */
int online:1;
/* Set to 1 when we disconnect.
* Not cleared until our file is closed.
*/
int disconnected:1;
/* strings sent by the host */
char manufacturer[ACC_STRING_SIZE];
char model[ACC_STRING_SIZE];
char description[ACC_STRING_SIZE];
char version[ACC_STRING_SIZE];
char uri[ACC_STRING_SIZE];
char serial[ACC_STRING_SIZE];
/* for acc_complete_set_string */
int string_index;
/* synchronize access to our device file */
atomic_t open_excl;
struct list_head tx_idle;
wait_queue_head_t read_wq;
wait_queue_head_t write_wq;
struct usb_request *rx_req[RX_REQ_MAX];
int rx_done;
struct delayed_work work;
};
static struct usb_interface_descriptor acc_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
.bInterfaceProtocol = 0,
};
static struct usb_endpoint_descriptor acc_highspeed_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(512),
};
static struct usb_endpoint_descriptor acc_highspeed_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16(512),
};
static struct usb_endpoint_descriptor acc_fullspeed_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor acc_fullspeed_out_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *fs_acc_descs[] = {
(struct usb_descriptor_header *) &acc_interface_desc,
(struct usb_descriptor_header *) &acc_fullspeed_in_desc,
(struct usb_descriptor_header *) &acc_fullspeed_out_desc,
NULL,
};
static struct usb_descriptor_header *hs_acc_descs[] = {
(struct usb_descriptor_header *) &acc_interface_desc,
(struct usb_descriptor_header *) &acc_highspeed_in_desc,
(struct usb_descriptor_header *) &acc_highspeed_out_desc,
NULL,
};
static struct usb_string acc_string_defs[] = {
[INTERFACE_STRING_INDEX].s = "Android Accessory Interface",
{ }, /* end of list */
};
static struct usb_gadget_strings acc_string_table = {
.language = 0x0409, /* en-US */
.strings = acc_string_defs,
};
static struct usb_gadget_strings *acc_strings[] = {
&acc_string_table,
NULL,
};
/* temporary variable used between acc_open() and acc_gadget_bind() */
static struct acc_dev *_acc_dev;
static inline struct acc_dev *func_to_dev(struct usb_function *f)
{
return container_of(f, struct acc_dev, function);
}
static struct usb_request *acc_request_new(struct usb_ep *ep, int buffer_size)
{
struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
if (!req)
return NULL;
/* now allocate buffers for the requests */
req->buf = kmalloc(buffer_size, GFP_KERNEL);
if (!req->buf) {
usb_ep_free_request(ep, req);
return NULL;
}
return req;
}
static void acc_request_free(struct usb_request *req, struct usb_ep *ep)
{
if (req) {
kfree(req->buf);
usb_ep_free_request(ep, req);
}
}
/* add a request to the tail of a list */
static void req_put(struct acc_dev *dev, struct list_head *head,
struct usb_request *req)
{
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
list_add_tail(&req->list, head);
spin_unlock_irqrestore(&dev->lock, flags);
}
/* remove a request from the head of a list */
static struct usb_request *req_get(struct acc_dev *dev, struct list_head *head)
{
unsigned long flags;
struct usb_request *req;
spin_lock_irqsave(&dev->lock, flags);
if (list_empty(head)) {
req = 0;
} else {
req = list_first_entry(head, struct usb_request, list);
list_del(&req->list);
}
spin_unlock_irqrestore(&dev->lock, flags);
return req;
}
static void acc_set_disconnected(struct acc_dev *dev)
{
dev->online = 0;
dev->disconnected = 1;
}
static void acc_complete_in(struct usb_ep *ep, struct usb_request *req)
{
struct acc_dev *dev = _acc_dev;
if (req->status != 0)
acc_set_disconnected(dev);
req_put(dev, &dev->tx_idle, req);
wake_up(&dev->write_wq);
}
static void acc_complete_out(struct usb_ep *ep, struct usb_request *req)
{
struct acc_dev *dev = _acc_dev;
dev->rx_done = 1;
if (req->status != 0)
acc_set_disconnected(dev);
wake_up(&dev->read_wq);
}
static void acc_complete_set_string(struct usb_ep *ep, struct usb_request *req)
{
struct acc_dev *dev = ep->driver_data;
struct usb_composite_dev *cdev = dev->cdev;
char *string_dest = NULL;
int length = req->actual;
if (req->status != 0) {
DBG(cdev, "acc_complete_set_string, err %d\n", req->status);
return;
}
switch (dev->string_index) {
case ACCESSORY_STRING_MANUFACTURER:
string_dest = dev->manufacturer;
break;
case ACCESSORY_STRING_MODEL:
string_dest = dev->model;
break;
case ACCESSORY_STRING_DESCRIPTION:
string_dest = dev->description;
break;
case ACCESSORY_STRING_VERSION:
string_dest = dev->version;
break;
case ACCESSORY_STRING_URI:
string_dest = dev->uri;
break;
case ACCESSORY_STRING_SERIAL:
string_dest = dev->serial;
break;
}
if (string_dest) {
unsigned long flags;
if (length >= ACC_STRING_SIZE)
length = ACC_STRING_SIZE - 1;
spin_lock_irqsave(&dev->lock, flags);
memcpy(string_dest, cdev->req->buf, length);
/* ensure zero termination */
string_dest[length] = 0;
spin_unlock_irqrestore(&dev->lock, flags);
} else {
DBG(cdev, "unknown accessory string index %d\n",
dev->string_index);
}
}
static int __init create_bulk_endpoints(struct acc_dev *dev,
struct usb_endpoint_descriptor *in_desc,
struct usb_endpoint_descriptor *out_desc)
{
struct usb_composite_dev *cdev = dev->cdev;
struct usb_request *req;
struct usb_ep *ep;
int i;
DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
ep = usb_ep_autoconfig(cdev->gadget, in_desc);
if (!ep) {
DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
return -ENODEV;
}
DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
ep->driver_data = dev; /* claim the endpoint */
dev->ep_in = ep;
ep = usb_ep_autoconfig(cdev->gadget, out_desc);
if (!ep) {
DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
return -ENODEV;
}
DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
ep->driver_data = dev; /* claim the endpoint */
dev->ep_out = ep;
ep = usb_ep_autoconfig(cdev->gadget, out_desc);
if (!ep) {
DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
return -ENODEV;
}
DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
ep->driver_data = dev; /* claim the endpoint */
dev->ep_out = ep;
/* now allocate requests for our endpoints */
for (i = 0; i < TX_REQ_MAX; i++) {
req = acc_request_new(dev->ep_in, BULK_BUFFER_SIZE);
if (!req)
goto fail;
req->complete = acc_complete_in;
req_put(dev, &dev->tx_idle, req);
}
for (i = 0; i < RX_REQ_MAX; i++) {
req = acc_request_new(dev->ep_out, BULK_BUFFER_SIZE);
if (!req)
goto fail;
req->complete = acc_complete_out;
dev->rx_req[i] = req;
}
return 0;
fail:
printk(KERN_ERR "acc_bind() could not allocate requests\n");
while ((req = req_get(dev, &dev->tx_idle)))
acc_request_free(req, dev->ep_in);
for (i = 0; i < RX_REQ_MAX; i++)
acc_request_free(dev->rx_req[i], dev->ep_out);
return -1;
}
static ssize_t acc_read(struct file *fp, char __user *buf,
size_t count, loff_t *pos)
{
struct acc_dev *dev = fp->private_data;
struct usb_composite_dev *cdev = dev->cdev;
struct usb_request *req;
int r = count, xfer;
int ret = 0;
DBG(cdev, "acc_read(%d)\n", count);
if (dev->disconnected)
return -ENODEV;
if (count > BULK_BUFFER_SIZE)
count = BULK_BUFFER_SIZE;
/* we will block until we're online */
DBG(cdev, "acc_read: waiting for online\n");
ret = wait_event_interruptible(dev->read_wq, dev->online);
if (ret < 0) {
r = ret;
goto done;
}
requeue_req:
/* queue a request */
req = dev->rx_req[0];
req->length = count;
dev->rx_done = 0;
ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
if (ret < 0) {
r = -EIO;
goto done;
} else {
DBG(cdev, "rx %p queue\n", req);
}
/* wait for a request to complete */
ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
if (ret < 0) {
r = ret;
usb_ep_dequeue(dev->ep_out, req);
goto done;
}
if (dev->online) {
/* If we got a 0-len packet, throw it back and try again. */
if (req->actual == 0)
goto requeue_req;
DBG(cdev, "rx %p %d\n", req, req->actual);
xfer = (req->actual < count) ? req->actual : count;
r = xfer;
if (copy_to_user(buf, req->buf, xfer))
r = -EFAULT;
} else
r = -EIO;
done:
DBG(cdev, "acc_read returning %d\n", r);
return r;
}
static ssize_t acc_write(struct file *fp, const char __user *buf,
size_t count, loff_t *pos)
{
struct acc_dev *dev = fp->private_data;
struct usb_composite_dev *cdev = dev->cdev;
struct usb_request *req = 0;
int r = count, xfer;
int ret;
DBG(cdev, "acc_write(%d)\n", count);
if (!dev->online || dev->disconnected)
return -ENODEV;
while (count > 0) {
if (!dev->online) {
DBG(cdev, "acc_write dev->error\n");
r = -EIO;
break;
}
/* get an idle tx request to use */
req = 0;
ret = wait_event_interruptible(dev->write_wq,
((req = req_get(dev, &dev->tx_idle)) || !dev->online));
if (!req) {
r = ret;
break;
}
if (count > BULK_BUFFER_SIZE)
xfer = BULK_BUFFER_SIZE;
else
xfer = count;
if (copy_from_user(req->buf, buf, xfer)) {
r = -EFAULT;
break;
}
req->length = xfer;
ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
if (ret < 0) {
DBG(cdev, "acc_write: xfer error %d\n", ret);
r = -EIO;
break;
}
buf += xfer;
count -= xfer;
/* zero this so we don't try to free it on error exit */
req = 0;
}
if (req)
req_put(dev, &dev->tx_idle, req);
DBG(cdev, "acc_write returning %d\n", r);
return r;
}
static long acc_ioctl(struct file *fp, unsigned code, unsigned long value)
{
struct acc_dev *dev = fp->private_data;
char *src = NULL;
int ret;
if (dev->function.disabled)
return -ENODEV;
switch (code) {
case ACCESSORY_GET_STRING_MANUFACTURER:
src = dev->manufacturer;
break;
case ACCESSORY_GET_STRING_MODEL:
src = dev->model;
break;
case ACCESSORY_GET_STRING_DESCRIPTION:
src = dev->description;
break;
case ACCESSORY_GET_STRING_VERSION:
src = dev->version;
break;
case ACCESSORY_GET_STRING_URI:
src = dev->uri;
break;
case ACCESSORY_GET_STRING_SERIAL:
src = dev->serial;
break;
}
if (!src)
return -EINVAL;
ret = strlen(src) + 1;
if (copy_to_user((void __user *)value, src, ret))
ret = -EFAULT;
return ret;
}
static int acc_open(struct inode *ip, struct file *fp)
{
printk(KERN_INFO "acc_open\n");
if (atomic_xchg(&_acc_dev->open_excl, 1))
return -EBUSY;
_acc_dev->disconnected = 0;
fp->private_data = _acc_dev;
return 0;
}
static int acc_release(struct inode *ip, struct file *fp)
{
printk(KERN_INFO "acc_release\n");
WARN_ON(!atomic_xchg(&_acc_dev->open_excl, 0));
_acc_dev->disconnected = 0;
return 0;
}
/* file operations for /dev/acc_usb */
static const struct file_operations acc_fops = {
.owner = THIS_MODULE,
.read = acc_read,
.write = acc_write,
.unlocked_ioctl = acc_ioctl,
.open = acc_open,
.release = acc_release,
};
static struct miscdevice acc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "usb_accessory",
.fops = &acc_fops,
};
static int
acc_function_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct acc_dev *dev = func_to_dev(f);
int id;
int ret;
dev->cdev = cdev;
DBG(cdev, "acc_function_bind dev: %p\n", dev);
/* allocate interface ID(s) */
id = usb_interface_id(c, f);
if (id < 0)
return id;
acc_interface_desc.bInterfaceNumber = id;
/* allocate endpoints */
ret = create_bulk_endpoints(dev, &acc_fullspeed_in_desc,
&acc_fullspeed_out_desc);
if (ret)
return ret;
/* support high speed hardware */
if (gadget_is_dualspeed(c->cdev->gadget)) {
acc_highspeed_in_desc.bEndpointAddress =
acc_fullspeed_in_desc.bEndpointAddress;
acc_highspeed_out_desc.bEndpointAddress =
acc_fullspeed_out_desc.bEndpointAddress;
}
DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
f->name, dev->ep_in->name, dev->ep_out->name);
return 0;
}
static void
acc_function_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct acc_dev *dev = func_to_dev(f);
struct usb_request *req;
int i;
spin_lock_irq(&dev->lock);
while ((req = req_get(dev, &dev->tx_idle)))
acc_request_free(req, dev->ep_in);
for (i = 0; i < RX_REQ_MAX; i++)
acc_request_free(dev->rx_req[i], dev->ep_out);
dev->online = 0;
spin_unlock_irq(&dev->lock);
misc_deregister(&acc_device);
kfree(_acc_dev);
_acc_dev = NULL;
}
static void acc_work(struct work_struct *data)
{
struct delayed_work *delayed = to_delayed_work(data);
struct acc_dev *dev =
container_of(delayed, struct acc_dev, work);
android_enable_function(&dev->function, 1);
}
static int acc_function_setup(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct acc_dev *dev = func_to_dev(f);
struct usb_composite_dev *cdev = dev->cdev;
int value = -EOPNOTSUPP;
u8 b_requestType = ctrl->bRequestType;
u8 b_request = ctrl->bRequest;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
/*
printk(KERN_INFO "acc_function_setup "
"%02x.%02x v%04x i%04x l%u\n",
b_requestType, b_request,
w_value, w_index, w_length);
*/
if (dev->function.disabled) {
if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) {
if (b_request == ACCESSORY_START) {
schedule_delayed_work(
&dev->work, msecs_to_jiffies(10));
value = 0;
} else if (b_request == ACCESSORY_SEND_STRING) {
dev->string_index = w_index;
cdev->gadget->ep0->driver_data = dev;
cdev->req->complete = acc_complete_set_string;
value = w_length;
}
} else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
if (b_request == ACCESSORY_GET_PROTOCOL) {
*((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
value = sizeof(u16);
/* clear any strings left over from a previous session */
memset(dev->manufacturer, 0, sizeof(dev->manufacturer));
memset(dev->model, 0, sizeof(dev->model));
memset(dev->description, 0, sizeof(dev->description));
memset(dev->version, 0, sizeof(dev->version));
memset(dev->uri, 0, sizeof(dev->uri));
memset(dev->serial, 0, sizeof(dev->serial));
}
}
}
if (value >= 0) {
cdev->req->zero = 0;
cdev->req->length = value;
value = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
if (value < 0)
ERROR(cdev, "%s setup response queue error\n",
__func__);
}
if (value == -EOPNOTSUPP)
VDBG(cdev,
"unknown class-specific control req "
"%02x.%02x v%04x i%04x l%u\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
return value;
}
static int acc_function_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct acc_dev *dev = func_to_dev(f);
struct usb_composite_dev *cdev = f->config->cdev;
int ret;
DBG(cdev, "acc_function_set_alt intf: %d alt: %d\n", intf, alt);
ret = usb_ep_enable(dev->ep_in,
ep_choose(cdev->gadget,
&acc_highspeed_in_desc,
&acc_fullspeed_in_desc));
if (ret)
return ret;
ret = usb_ep_enable(dev->ep_out,
ep_choose(cdev->gadget,
&acc_highspeed_out_desc,
&acc_fullspeed_out_desc));
if (ret) {
usb_ep_disable(dev->ep_in);
return ret;
}
if (!dev->function.disabled)
dev->online = 1;
/* readers may be blocked waiting for us to go online */
wake_up(&dev->read_wq);
return 0;
}
static void acc_function_disable(struct usb_function *f)
{
struct acc_dev *dev = func_to_dev(f);
struct usb_composite_dev *cdev = dev->cdev;
DBG(cdev, "acc_function_disable\n");
acc_set_disconnected(dev);
usb_ep_disable(dev->ep_in);
usb_ep_disable(dev->ep_out);
/* readers may be blocked waiting for us to go online */
wake_up(&dev->read_wq);
VDBG(cdev, "%s disabled\n", dev->function.name);
}
static int acc_bind_config(struct usb_configuration *c)
{
struct acc_dev *dev;
int ret;
printk(KERN_INFO "acc_bind_config\n");
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
/* allocate a string ID for our interface */
if (acc_string_defs[INTERFACE_STRING_INDEX].id == 0) {
ret = usb_string_id(c->cdev);
if (ret < 0)
return ret;
acc_string_defs[INTERFACE_STRING_INDEX].id = ret;
acc_interface_desc.iInterface = ret;
}
spin_lock_init(&dev->lock);
init_waitqueue_head(&dev->read_wq);
init_waitqueue_head(&dev->write_wq);
atomic_set(&dev->open_excl, 0);
INIT_LIST_HEAD(&dev->tx_idle);
INIT_DELAYED_WORK(&dev->work, acc_work);
dev->cdev = c->cdev;
dev->function.name = "accessory";
dev->function.strings = acc_strings,
dev->function.descriptors = fs_acc_descs;
dev->function.hs_descriptors = hs_acc_descs;
dev->function.bind = acc_function_bind;
dev->function.unbind = acc_function_unbind;
dev->function.setup = acc_function_setup;
dev->function.set_alt = acc_function_set_alt;
dev->function.disable = acc_function_disable;
dev->function.disabled = 1;
/* _acc_dev must be set before calling usb_gadget_register_driver */
_acc_dev = dev;
ret = misc_register(&acc_device);
if (ret)
goto err1;
ret = usb_add_function(c, &dev->function);
if (ret)
goto err2;
return 0;
err2:
misc_deregister(&acc_device);
err1:
kfree(dev);
printk(KERN_ERR "USB accessory gadget driver failed to initialize\n");
return ret;
}
static struct android_usb_function acc_function = {
.name = "accessory",
.bind_config = acc_bind_config,
};
static int __init init(void)
{
printk(KERN_INFO "f_accessory init\n");
android_register_function(&acc_function);
return 0;
}
module_init(init);

1
include/linux/usb/composite.h
View File

@ -101,6 +101,7 @@ struct usb_function {
struct usb_configuration *config;
int hidden;
int disabled;
/* REVISIT: bind() functions can be marked __init, which
* makes trouble for section mismatch analysis. See if

81
include/linux/usb/f_accessory.h Normal file
View File

@ -0,0 +1,81 @@
/*
* Gadget Function Driver for Android USB accessories
*
* Copyright (C) 2011 Google, Inc.
* Author: Mike Lockwood <lockwood@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#ifndef __LINUX_USB_F_ACCESSORY_H
#define __LINUX_USB_F_ACCESSORY_H
/* Use Google Vendor ID when in accessory mode */
#define USB_ACCESSORY_VENDOR_ID 0x18D1
/* Product ID to use when in accessory mode */
#define USB_ACCESSORY_PRODUCT_ID 0x2D00
/* Product ID to use when in accessory mode and adb is enabled */
#define USB_ACCESSORY_ADB_PRODUCT_ID 0x2D01
/* Indexes for strings sent by the host via ACCESSORY_SEND_STRING */
#define ACCESSORY_STRING_MANUFACTURER 0
#define ACCESSORY_STRING_MODEL 1
#define ACCESSORY_STRING_DESCRIPTION 2
#define ACCESSORY_STRING_VERSION 3
#define ACCESSORY_STRING_URI 4
#define ACCESSORY_STRING_SERIAL 5
/* Control request for retrieving device's protocol version (currently 1)
*
* requestType: USB_DIR_IN | USB_TYPE_VENDOR
* request: ACCESSORY_GET_PROTOCOL
* value: 0
* index: 0
* data version number (16 bits little endian)
*/
#define ACCESSORY_GET_PROTOCOL 51
/* Control request for host to send a string to the device
*
* requestType: USB_DIR_OUT | USB_TYPE_VENDOR
* request: ACCESSORY_SEND_STRING
* value: 0
* index: string ID
* data zero terminated UTF8 string
*
* The device can later retrieve these strings via the
* ACCESSORY_GET_STRING_* ioctls
*/
#define ACCESSORY_SEND_STRING 52
/* Control request for starting device in accessory mode.
* The host sends this after setting all its strings to the device.
*
* requestType: USB_DIR_OUT | USB_TYPE_VENDOR
* request: ACCESSORY_START
* value: 0
* index: 0
* data none
*/
#define ACCESSORY_START 53
/* ioctls for retrieving strings set by the host */
#define ACCESSORY_GET_STRING_MANUFACTURER _IOW('M', 1, char[256])
#define ACCESSORY_GET_STRING_MODEL _IOW('M', 2, char[256])
#define ACCESSORY_GET_STRING_DESCRIPTION _IOW('M', 3, char[256])
#define ACCESSORY_GET_STRING_VERSION _IOW('M', 4, char[256])
#define ACCESSORY_GET_STRING_URI _IOW('M', 5, char[256])
#define ACCESSORY_GET_STRING_SERIAL _IOW('M', 6, char[256])
#endif /* __LINUX_USB_F_ACCESSORY_H */