+++ /dev/null
-/*
- * Gadget Driver for Android ADB
- *
- * Copyright (C) 2008 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.
- *
- */
-
-#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/sched.h>
-#include <linux/types.h>
-#include <linux/device.h>
-#include <linux/miscdevice.h>
-
-#define ADB_BULK_BUFFER_SIZE 4096
-
-/* number of tx requests to allocate */
-#define TX_REQ_MAX 4
-
-static const char adb_shortname[] = "android_adb";
-
-struct adb_dev {
- struct usb_function function;
- struct usb_composite_dev *cdev;
- spinlock_t lock;
-
- struct usb_ep *ep_in;
- struct usb_ep *ep_out;
-
- int online;
- int error;
-
- atomic_t read_excl;
- atomic_t write_excl;
- 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;
- int rx_done;
-};
-
-static struct usb_interface_descriptor adb_interface_desc = {
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = 0,
- .bNumEndpoints = 2,
- .bInterfaceClass = 0xFF,
- .bInterfaceSubClass = 0x42,
- .bInterfaceProtocol = 1,
-};
-
-static struct usb_endpoint_descriptor adb_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 adb_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 adb_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 adb_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_adb_descs[] = {
- (struct usb_descriptor_header *) &adb_interface_desc,
- (struct usb_descriptor_header *) &adb_fullspeed_in_desc,
- (struct usb_descriptor_header *) &adb_fullspeed_out_desc,
- NULL,
-};
-
-static struct usb_descriptor_header *hs_adb_descs[] = {
- (struct usb_descriptor_header *) &adb_interface_desc,
- (struct usb_descriptor_header *) &adb_highspeed_in_desc,
- (struct usb_descriptor_header *) &adb_highspeed_out_desc,
- NULL,
-};
-
-static void adb_ready_callback(void);
-static void adb_closed_callback(void);
-
-/* temporary variable used between adb_open() and adb_gadget_bind() */
-static struct adb_dev *_adb_dev;
-
-static inline struct adb_dev *func_to_adb(struct usb_function *f)
-{
- return container_of(f, struct adb_dev, function);
-}
-
-
-static struct usb_request *adb_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 adb_request_free(struct usb_request *req, struct usb_ep *ep)
-{
- if (req) {
- kfree(req->buf);
- usb_ep_free_request(ep, req);
- }
-}
-
-static inline int adb_lock(atomic_t *excl)
-{
- if (atomic_inc_return(excl) == 1) {
- return 0;
- } else {
- atomic_dec(excl);
- return -1;
- }
-}
-
-static inline void adb_unlock(atomic_t *excl)
-{
- atomic_dec(excl);
-}
-
-/* add a request to the tail of a list */
-void adb_req_put(struct adb_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 */
-struct usb_request *adb_req_get(struct adb_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 adb_complete_in(struct usb_ep *ep, struct usb_request *req)
-{
- struct adb_dev *dev = _adb_dev;
-
- if (req->status != 0)
- dev->error = 1;
-
- adb_req_put(dev, &dev->tx_idle, req);
-
- wake_up(&dev->write_wq);
-}
-
-static void adb_complete_out(struct usb_ep *ep, struct usb_request *req)
-{
- struct adb_dev *dev = _adb_dev;
-
- dev->rx_done = 1;
- if (req->status != 0 && req->status != -ECONNRESET)
- dev->error = 1;
-
- wake_up(&dev->read_wq);
-}
-
-static int adb_create_bulk_endpoints(struct adb_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 adb ep_out got %s\n", ep->name);
- ep->driver_data = dev; /* claim the endpoint */
- dev->ep_out = ep;
-
- /* now allocate requests for our endpoints */
- req = adb_request_new(dev->ep_out, ADB_BULK_BUFFER_SIZE);
- if (!req)
- goto fail;
- req->complete = adb_complete_out;
- dev->rx_req = req;
-
- for (i = 0; i < TX_REQ_MAX; i++) {
- req = adb_request_new(dev->ep_in, ADB_BULK_BUFFER_SIZE);
- if (!req)
- goto fail;
- req->complete = adb_complete_in;
- adb_req_put(dev, &dev->tx_idle, req);
- }
-
- return 0;
-
-fail:
- printk(KERN_ERR "adb_bind() could not allocate requests\n");
- return -1;
-}
-
-static ssize_t adb_read(struct file *fp, char __user *buf,
- size_t count, loff_t *pos)
-{
- struct adb_dev *dev = fp->private_data;
- struct usb_request *req;
- int r = count, xfer;
- int ret;
-
- pr_debug("adb_read(%d)\n", count);
- if (!_adb_dev)
- return -ENODEV;
-
- if (count > ADB_BULK_BUFFER_SIZE)
- return -EINVAL;
-
- if (adb_lock(&dev->read_excl))
- return -EBUSY;
-
- /* we will block until we're online */
- while (!(dev->online || dev->error)) {
- pr_debug("adb_read: waiting for online state\n");
- ret = wait_event_interruptible(dev->read_wq,
- (dev->online || dev->error));
- if (ret < 0) {
- adb_unlock(&dev->read_excl);
- return ret;
- }
- }
- if (dev->error) {
- r = -EIO;
- goto done;
- }
-
-requeue_req:
- /* queue a request */
- req = dev->rx_req;
- req->length = count;
- dev->rx_done = 0;
- ret = usb_ep_queue(dev->ep_out, req, GFP_ATOMIC);
- if (ret < 0) {
- pr_debug("adb_read: failed to queue req %p (%d)\n", req, ret);
- r = -EIO;
- dev->error = 1;
- goto done;
- } else {
- pr_debug("rx %p queue\n", req);
- }
-
- /* wait for a request to complete */
- ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
- if (ret < 0) {
- if (ret != -ERESTARTSYS)
- dev->error = 1;
- r = ret;
- usb_ep_dequeue(dev->ep_out, req);
- goto done;
- }
- if (!dev->error) {
- /* If we got a 0-len packet, throw it back and try again. */
- if (req->actual == 0)
- goto requeue_req;
-
- pr_debug("rx %p %d\n", req, req->actual);
- xfer = (req->actual < count) ? req->actual : count;
- if (copy_to_user(buf, req->buf, xfer))
- r = -EFAULT;
-
- } else
- r = -EIO;
-
-done:
- adb_unlock(&dev->read_excl);
- pr_debug("adb_read returning %d\n", r);
- return r;
-}
-
-static ssize_t adb_write(struct file *fp, const char __user *buf,
- size_t count, loff_t *pos)
-{
- struct adb_dev *dev = fp->private_data;
- struct usb_request *req = 0;
- int r = count, xfer;
- int ret;
-
- if (!_adb_dev)
- return -ENODEV;
- pr_debug("adb_write(%d)\n", count);
-
- if (adb_lock(&dev->write_excl))
- return -EBUSY;
-
- while (count > 0) {
- if (dev->error) {
- pr_debug("adb_write dev->error\n");
- r = -EIO;
- break;
- }
-
- /* get an idle tx request to use */
- req = 0;
- ret = wait_event_interruptible(dev->write_wq,
- (req = adb_req_get(dev, &dev->tx_idle)) || dev->error);
-
- if (ret < 0) {
- r = ret;
- break;
- }
-
- if (req != 0) {
- if (count > ADB_BULK_BUFFER_SIZE)
- xfer = ADB_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_ATOMIC);
- if (ret < 0) {
- pr_debug("adb_write: xfer error %d\n", ret);
- dev->error = 1;
- r = -EIO;
- break;
- }
-
- buf += xfer;
- count -= xfer;
-
- /* zero this so we don't try to free it on error exit */
- req = 0;
- }
- }
-
- if (req)
- adb_req_put(dev, &dev->tx_idle, req);
-
- adb_unlock(&dev->write_excl);
- pr_debug("adb_write returning %d\n", r);
- return r;
-}
-
-static int adb_open(struct inode *ip, struct file *fp)
-{
- pr_info("adb_open\n");
- if (!_adb_dev)
- return -ENODEV;
-
- if (adb_lock(&_adb_dev->open_excl))
- return -EBUSY;
-
- fp->private_data = _adb_dev;
-
- /* clear the error latch */
- _adb_dev->error = 0;
-
- adb_ready_callback();
-
- return 0;
-}
-
-static int adb_release(struct inode *ip, struct file *fp)
-{
- pr_info("adb_release\n");
-
- adb_closed_callback();
-
- adb_unlock(&_adb_dev->open_excl);
- return 0;
-}
-
-/* file operations for ADB device /dev/android_adb */
-static const struct file_operations adb_fops = {
- .owner = THIS_MODULE,
- .read = adb_read,
- .write = adb_write,
- .open = adb_open,
- .release = adb_release,
-};
-
-static struct miscdevice adb_device = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = adb_shortname,
- .fops = &adb_fops,
-};
-
-
-
-
-static int
-adb_function_bind(struct usb_configuration *c, struct usb_function *f)
-{
- struct usb_composite_dev *cdev = c->cdev;
- struct adb_dev *dev = func_to_adb(f);
- int id;
- int ret;
-
- dev->cdev = cdev;
- DBG(cdev, "adb_function_bind dev: %p\n", dev);
-
- /* allocate interface ID(s) */
- id = usb_interface_id(c, f);
- if (id < 0)
- return id;
- adb_interface_desc.bInterfaceNumber = id;
-
- /* allocate endpoints */
- ret = adb_create_bulk_endpoints(dev, &adb_fullspeed_in_desc,
- &adb_fullspeed_out_desc);
- if (ret)
- return ret;
-
- /* support high speed hardware */
- if (gadget_is_dualspeed(c->cdev->gadget)) {
- adb_highspeed_in_desc.bEndpointAddress =
- adb_fullspeed_in_desc.bEndpointAddress;
- adb_highspeed_out_desc.bEndpointAddress =
- adb_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
-adb_function_unbind(struct usb_configuration *c, struct usb_function *f)
-{
- struct adb_dev *dev = func_to_adb(f);
- struct usb_request *req;
-
-
- dev->online = 0;
- dev->error = 1;
-
- wake_up(&dev->read_wq);
-
- adb_request_free(dev->rx_req, dev->ep_out);
- while ((req = adb_req_get(dev, &dev->tx_idle)))
- adb_request_free(req, dev->ep_in);
-}
-
-static int adb_function_set_alt(struct usb_function *f,
- unsigned intf, unsigned alt)
-{
- struct adb_dev *dev = func_to_adb(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- int ret;
-
- DBG(cdev, "adb_function_set_alt intf: %d alt: %d\n", intf, alt);
-
- ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in);
- if (ret)
- return ret;
-
- ret = usb_ep_enable(dev->ep_in);
- if (ret)
- return ret;
-
- ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out);
- if (ret)
- return ret;
-
- ret = usb_ep_enable(dev->ep_out);
- if (ret) {
- usb_ep_disable(dev->ep_in);
- return ret;
- }
- dev->online = 1;
-
- /* readers may be blocked waiting for us to go online */
- wake_up(&dev->read_wq);
- return 0;
-}
-
-static void adb_function_disable(struct usb_function *f)
-{
- struct adb_dev *dev = func_to_adb(f);
- struct usb_composite_dev *cdev = dev->cdev;
-
- DBG(cdev, "adb_function_disable cdev %p\n", cdev);
- dev->online = 0;
- dev->error = 1;
- 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 adb_bind_config(struct usb_configuration *c)
-{
- struct adb_dev *dev = _adb_dev;
-
- printk(KERN_INFO "adb_bind_config\n");
-
- dev->cdev = c->cdev;
- dev->function.name = "adb";
- dev->function.fs_descriptors = fs_adb_descs;
- dev->function.hs_descriptors = hs_adb_descs;
- dev->function.bind = adb_function_bind;
- dev->function.unbind = adb_function_unbind;
- dev->function.set_alt = adb_function_set_alt;
- dev->function.disable = adb_function_disable;
-
- return usb_add_function(c, &dev->function);
-}
-
-static int adb_setup(void)
-{
- struct adb_dev *dev;
- int ret;
-
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
-
- spin_lock_init(&dev->lock);
-
- init_waitqueue_head(&dev->read_wq);
- init_waitqueue_head(&dev->write_wq);
-
- atomic_set(&dev->open_excl, 0);
- atomic_set(&dev->read_excl, 0);
- atomic_set(&dev->write_excl, 0);
-
- INIT_LIST_HEAD(&dev->tx_idle);
-
- _adb_dev = dev;
-
- ret = misc_register(&adb_device);
- if (ret)
- goto err;
-
- return 0;
-
-err:
- kfree(dev);
- printk(KERN_ERR "adb gadget driver failed to initialize\n");
- return ret;
-}
-
-static void adb_cleanup(void)
-{
- misc_deregister(&adb_device);
-
- kfree(_adb_dev);
- _adb_dev = NULL;
-}
projects / firefly-linux-kernel-4.4.55.git / commitdiff