ANDROID: usb: gadget: Fix android gadget driver build (47aabb95) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/usb/gadget/f_adb.c

deleted100644 → 0

+0 −619

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		/*
		* 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;
		}