mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 17:18:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
664
drivers/usb/usb-skeleton.c
Normal file
664
drivers/usb/usb-skeleton.c
Normal file
|
|
@ -0,0 +1,664 @@
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|||
/*
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* USB Skeleton driver - 2.2
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*
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* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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* This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
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* but has been rewritten to be easier to read and use.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kref.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/mutex.h>
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/* Define these values to match your devices */
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#define USB_SKEL_VENDOR_ID 0xfff0
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#define USB_SKEL_PRODUCT_ID 0xfff0
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/* table of devices that work with this driver */
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static const struct usb_device_id skel_table[] = {
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{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, skel_table);
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/* Get a minor range for your devices from the usb maintainer */
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#define USB_SKEL_MINOR_BASE 192
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/* our private defines. if this grows any larger, use your own .h file */
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#define MAX_TRANSFER (PAGE_SIZE - 512)
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/* MAX_TRANSFER is chosen so that the VM is not stressed by
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allocations > PAGE_SIZE and the number of packets in a page
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is an integer 512 is the largest possible packet on EHCI */
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#define WRITES_IN_FLIGHT 8
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/* arbitrarily chosen */
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/* Structure to hold all of our device specific stuff */
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struct usb_skel {
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struct usb_device *udev; /* the usb device for this device */
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struct usb_interface *interface; /* the interface for this device */
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struct semaphore limit_sem; /* limiting the number of writes in progress */
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struct usb_anchor submitted; /* in case we need to retract our submissions */
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struct urb *bulk_in_urb; /* the urb to read data with */
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unsigned char *bulk_in_buffer; /* the buffer to receive data */
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size_t bulk_in_size; /* the size of the receive buffer */
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size_t bulk_in_filled; /* number of bytes in the buffer */
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size_t bulk_in_copied; /* already copied to user space */
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__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
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__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
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int errors; /* the last request tanked */
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bool ongoing_read; /* a read is going on */
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spinlock_t err_lock; /* lock for errors */
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struct kref kref;
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struct mutex io_mutex; /* synchronize I/O with disconnect */
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wait_queue_head_t bulk_in_wait; /* to wait for an ongoing read */
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};
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#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
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static struct usb_driver skel_driver;
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static void skel_draw_down(struct usb_skel *dev);
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static void skel_delete(struct kref *kref)
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{
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struct usb_skel *dev = to_skel_dev(kref);
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usb_free_urb(dev->bulk_in_urb);
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usb_put_dev(dev->udev);
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kfree(dev->bulk_in_buffer);
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kfree(dev);
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}
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static int skel_open(struct inode *inode, struct file *file)
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{
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struct usb_skel *dev;
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struct usb_interface *interface;
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int subminor;
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int retval = 0;
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subminor = iminor(inode);
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interface = usb_find_interface(&skel_driver, subminor);
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if (!interface) {
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pr_err("%s - error, can't find device for minor %d\n",
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__func__, subminor);
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retval = -ENODEV;
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goto exit;
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}
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dev = usb_get_intfdata(interface);
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if (!dev) {
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retval = -ENODEV;
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goto exit;
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}
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retval = usb_autopm_get_interface(interface);
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if (retval)
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goto exit;
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/* increment our usage count for the device */
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kref_get(&dev->kref);
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/* save our object in the file's private structure */
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file->private_data = dev;
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exit:
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return retval;
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}
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static int skel_release(struct inode *inode, struct file *file)
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{
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struct usb_skel *dev;
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dev = file->private_data;
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if (dev == NULL)
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return -ENODEV;
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/* allow the device to be autosuspended */
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mutex_lock(&dev->io_mutex);
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if (dev->interface)
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usb_autopm_put_interface(dev->interface);
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mutex_unlock(&dev->io_mutex);
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/* decrement the count on our device */
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kref_put(&dev->kref, skel_delete);
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return 0;
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}
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static int skel_flush(struct file *file, fl_owner_t id)
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{
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struct usb_skel *dev;
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int res;
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dev = file->private_data;
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if (dev == NULL)
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return -ENODEV;
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/* wait for io to stop */
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mutex_lock(&dev->io_mutex);
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skel_draw_down(dev);
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/* read out errors, leave subsequent opens a clean slate */
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spin_lock_irq(&dev->err_lock);
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res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0;
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dev->errors = 0;
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spin_unlock_irq(&dev->err_lock);
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mutex_unlock(&dev->io_mutex);
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return res;
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}
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static void skel_read_bulk_callback(struct urb *urb)
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{
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struct usb_skel *dev;
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dev = urb->context;
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spin_lock(&dev->err_lock);
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/* sync/async unlink faults aren't errors */
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if (urb->status) {
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if (!(urb->status == -ENOENT ||
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urb->status == -ECONNRESET ||
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urb->status == -ESHUTDOWN))
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dev_err(&dev->interface->dev,
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"%s - nonzero write bulk status received: %d\n",
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__func__, urb->status);
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dev->errors = urb->status;
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} else {
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dev->bulk_in_filled = urb->actual_length;
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}
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dev->ongoing_read = 0;
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spin_unlock(&dev->err_lock);
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wake_up_interruptible(&dev->bulk_in_wait);
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}
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static int skel_do_read_io(struct usb_skel *dev, size_t count)
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{
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int rv;
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/* prepare a read */
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usb_fill_bulk_urb(dev->bulk_in_urb,
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dev->udev,
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usb_rcvbulkpipe(dev->udev,
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dev->bulk_in_endpointAddr),
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dev->bulk_in_buffer,
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min(dev->bulk_in_size, count),
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skel_read_bulk_callback,
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dev);
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/* tell everybody to leave the URB alone */
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spin_lock_irq(&dev->err_lock);
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dev->ongoing_read = 1;
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spin_unlock_irq(&dev->err_lock);
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/* submit bulk in urb, which means no data to deliver */
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dev->bulk_in_filled = 0;
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dev->bulk_in_copied = 0;
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||||
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||||
/* do it */
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rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL);
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if (rv < 0) {
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dev_err(&dev->interface->dev,
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"%s - failed submitting read urb, error %d\n",
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__func__, rv);
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rv = (rv == -ENOMEM) ? rv : -EIO;
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spin_lock_irq(&dev->err_lock);
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dev->ongoing_read = 0;
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spin_unlock_irq(&dev->err_lock);
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}
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return rv;
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}
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static ssize_t skel_read(struct file *file, char *buffer, size_t count,
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loff_t *ppos)
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{
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struct usb_skel *dev;
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int rv;
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bool ongoing_io;
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dev = file->private_data;
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/* if we cannot read at all, return EOF */
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||||
if (!dev->bulk_in_urb || !count)
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return 0;
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||||
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/* no concurrent readers */
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rv = mutex_lock_interruptible(&dev->io_mutex);
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||||
if (rv < 0)
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return rv;
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||||
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if (!dev->interface) { /* disconnect() was called */
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rv = -ENODEV;
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||||
goto exit;
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||||
}
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||||
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||||
/* if IO is under way, we must not touch things */
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||||
retry:
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spin_lock_irq(&dev->err_lock);
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ongoing_io = dev->ongoing_read;
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spin_unlock_irq(&dev->err_lock);
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if (ongoing_io) {
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/* nonblocking IO shall not wait */
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if (file->f_flags & O_NONBLOCK) {
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rv = -EAGAIN;
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goto exit;
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||||
}
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/*
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* IO may take forever
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* hence wait in an interruptible state
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*/
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rv = wait_event_interruptible(dev->bulk_in_wait, (!dev->ongoing_read));
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if (rv < 0)
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goto exit;
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}
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/* errors must be reported */
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rv = dev->errors;
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||||
if (rv < 0) {
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||||
/* any error is reported once */
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||||
dev->errors = 0;
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||||
/* to preserve notifications about reset */
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rv = (rv == -EPIPE) ? rv : -EIO;
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/* report it */
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||||
goto exit;
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||||
}
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||||
|
||||
/*
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||||
* if the buffer is filled we may satisfy the read
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||||
* else we need to start IO
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||||
*/
|
||||
|
||||
if (dev->bulk_in_filled) {
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||||
/* we had read data */
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||||
size_t available = dev->bulk_in_filled - dev->bulk_in_copied;
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||||
size_t chunk = min(available, count);
|
||||
|
||||
if (!available) {
|
||||
/*
|
||||
* all data has been used
|
||||
* actual IO needs to be done
|
||||
*/
|
||||
rv = skel_do_read_io(dev, count);
|
||||
if (rv < 0)
|
||||
goto exit;
|
||||
else
|
||||
goto retry;
|
||||
}
|
||||
/*
|
||||
* data is available
|
||||
* chunk tells us how much shall be copied
|
||||
*/
|
||||
|
||||
if (copy_to_user(buffer,
|
||||
dev->bulk_in_buffer + dev->bulk_in_copied,
|
||||
chunk))
|
||||
rv = -EFAULT;
|
||||
else
|
||||
rv = chunk;
|
||||
|
||||
dev->bulk_in_copied += chunk;
|
||||
|
||||
/*
|
||||
* if we are asked for more than we have,
|
||||
* we start IO but don't wait
|
||||
*/
|
||||
if (available < count)
|
||||
skel_do_read_io(dev, count - chunk);
|
||||
} else {
|
||||
/* no data in the buffer */
|
||||
rv = skel_do_read_io(dev, count);
|
||||
if (rv < 0)
|
||||
goto exit;
|
||||
else
|
||||
goto retry;
|
||||
}
|
||||
exit:
|
||||
mutex_unlock(&dev->io_mutex);
|
||||
return rv;
|
||||
}
|
||||
|
||||
static void skel_write_bulk_callback(struct urb *urb)
|
||||
{
|
||||
struct usb_skel *dev;
|
||||
|
||||
dev = urb->context;
|
||||
|
||||
/* sync/async unlink faults aren't errors */
|
||||
if (urb->status) {
|
||||
if (!(urb->status == -ENOENT ||
|
||||
urb->status == -ECONNRESET ||
|
||||
urb->status == -ESHUTDOWN))
|
||||
dev_err(&dev->interface->dev,
|
||||
"%s - nonzero write bulk status received: %d\n",
|
||||
__func__, urb->status);
|
||||
|
||||
spin_lock(&dev->err_lock);
|
||||
dev->errors = urb->status;
|
||||
spin_unlock(&dev->err_lock);
|
||||
}
|
||||
|
||||
/* free up our allocated buffer */
|
||||
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
|
||||
urb->transfer_buffer, urb->transfer_dma);
|
||||
up(&dev->limit_sem);
|
||||
}
|
||||
|
||||
static ssize_t skel_write(struct file *file, const char *user_buffer,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct usb_skel *dev;
|
||||
int retval = 0;
|
||||
struct urb *urb = NULL;
|
||||
char *buf = NULL;
|
||||
size_t writesize = min(count, (size_t)MAX_TRANSFER);
|
||||
|
||||
dev = file->private_data;
|
||||
|
||||
/* verify that we actually have some data to write */
|
||||
if (count == 0)
|
||||
goto exit;
|
||||
|
||||
/*
|
||||
* limit the number of URBs in flight to stop a user from using up all
|
||||
* RAM
|
||||
*/
|
||||
if (!(file->f_flags & O_NONBLOCK)) {
|
||||
if (down_interruptible(&dev->limit_sem)) {
|
||||
retval = -ERESTARTSYS;
|
||||
goto exit;
|
||||
}
|
||||
} else {
|
||||
if (down_trylock(&dev->limit_sem)) {
|
||||
retval = -EAGAIN;
|
||||
goto exit;
|
||||
}
|
||||
}
|
||||
|
||||
spin_lock_irq(&dev->err_lock);
|
||||
retval = dev->errors;
|
||||
if (retval < 0) {
|
||||
/* any error is reported once */
|
||||
dev->errors = 0;
|
||||
/* to preserve notifications about reset */
|
||||
retval = (retval == -EPIPE) ? retval : -EIO;
|
||||
}
|
||||
spin_unlock_irq(&dev->err_lock);
|
||||
if (retval < 0)
|
||||
goto error;
|
||||
|
||||
/* create a urb, and a buffer for it, and copy the data to the urb */
|
||||
urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!urb) {
|
||||
retval = -ENOMEM;
|
||||
goto error;
|
||||
}
|
||||
|
||||
buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL,
|
||||
&urb->transfer_dma);
|
||||
if (!buf) {
|
||||
retval = -ENOMEM;
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (copy_from_user(buf, user_buffer, writesize)) {
|
||||
retval = -EFAULT;
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* this lock makes sure we don't submit URBs to gone devices */
|
||||
mutex_lock(&dev->io_mutex);
|
||||
if (!dev->interface) { /* disconnect() was called */
|
||||
mutex_unlock(&dev->io_mutex);
|
||||
retval = -ENODEV;
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* initialize the urb properly */
|
||||
usb_fill_bulk_urb(urb, dev->udev,
|
||||
usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
|
||||
buf, writesize, skel_write_bulk_callback, dev);
|
||||
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
||||
usb_anchor_urb(urb, &dev->submitted);
|
||||
|
||||
/* send the data out the bulk port */
|
||||
retval = usb_submit_urb(urb, GFP_KERNEL);
|
||||
mutex_unlock(&dev->io_mutex);
|
||||
if (retval) {
|
||||
dev_err(&dev->interface->dev,
|
||||
"%s - failed submitting write urb, error %d\n",
|
||||
__func__, retval);
|
||||
goto error_unanchor;
|
||||
}
|
||||
|
||||
/*
|
||||
* release our reference to this urb, the USB core will eventually free
|
||||
* it entirely
|
||||
*/
|
||||
usb_free_urb(urb);
|
||||
|
||||
|
||||
return writesize;
|
||||
|
||||
error_unanchor:
|
||||
usb_unanchor_urb(urb);
|
||||
error:
|
||||
if (urb) {
|
||||
usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma);
|
||||
usb_free_urb(urb);
|
||||
}
|
||||
up(&dev->limit_sem);
|
||||
|
||||
exit:
|
||||
return retval;
|
||||
}
|
||||
|
||||
static const struct file_operations skel_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.read = skel_read,
|
||||
.write = skel_write,
|
||||
.open = skel_open,
|
||||
.release = skel_release,
|
||||
.flush = skel_flush,
|
||||
.llseek = noop_llseek,
|
||||
};
|
||||
|
||||
/*
|
||||
* usb class driver info in order to get a minor number from the usb core,
|
||||
* and to have the device registered with the driver core
|
||||
*/
|
||||
static struct usb_class_driver skel_class = {
|
||||
.name = "skel%d",
|
||||
.fops = &skel_fops,
|
||||
.minor_base = USB_SKEL_MINOR_BASE,
|
||||
};
|
||||
|
||||
static int skel_probe(struct usb_interface *interface,
|
||||
const struct usb_device_id *id)
|
||||
{
|
||||
struct usb_skel *dev;
|
||||
struct usb_host_interface *iface_desc;
|
||||
struct usb_endpoint_descriptor *endpoint;
|
||||
size_t buffer_size;
|
||||
int i;
|
||||
int retval = -ENOMEM;
|
||||
|
||||
/* allocate memory for our device state and initialize it */
|
||||
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
||||
if (!dev) {
|
||||
dev_err(&interface->dev, "Out of memory\n");
|
||||
goto error;
|
||||
}
|
||||
kref_init(&dev->kref);
|
||||
sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
|
||||
mutex_init(&dev->io_mutex);
|
||||
spin_lock_init(&dev->err_lock);
|
||||
init_usb_anchor(&dev->submitted);
|
||||
init_waitqueue_head(&dev->bulk_in_wait);
|
||||
|
||||
dev->udev = usb_get_dev(interface_to_usbdev(interface));
|
||||
dev->interface = interface;
|
||||
|
||||
/* set up the endpoint information */
|
||||
/* use only the first bulk-in and bulk-out endpoints */
|
||||
iface_desc = interface->cur_altsetting;
|
||||
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
||||
endpoint = &iface_desc->endpoint[i].desc;
|
||||
|
||||
if (!dev->bulk_in_endpointAddr &&
|
||||
usb_endpoint_is_bulk_in(endpoint)) {
|
||||
/* we found a bulk in endpoint */
|
||||
buffer_size = usb_endpoint_maxp(endpoint);
|
||||
dev->bulk_in_size = buffer_size;
|
||||
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
|
||||
dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
|
||||
if (!dev->bulk_in_buffer) {
|
||||
dev_err(&interface->dev,
|
||||
"Could not allocate bulk_in_buffer\n");
|
||||
goto error;
|
||||
}
|
||||
dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!dev->bulk_in_urb) {
|
||||
dev_err(&interface->dev,
|
||||
"Could not allocate bulk_in_urb\n");
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
if (!dev->bulk_out_endpointAddr &&
|
||||
usb_endpoint_is_bulk_out(endpoint)) {
|
||||
/* we found a bulk out endpoint */
|
||||
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
|
||||
}
|
||||
}
|
||||
if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
|
||||
dev_err(&interface->dev,
|
||||
"Could not find both bulk-in and bulk-out endpoints\n");
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* save our data pointer in this interface device */
|
||||
usb_set_intfdata(interface, dev);
|
||||
|
||||
/* we can register the device now, as it is ready */
|
||||
retval = usb_register_dev(interface, &skel_class);
|
||||
if (retval) {
|
||||
/* something prevented us from registering this driver */
|
||||
dev_err(&interface->dev,
|
||||
"Not able to get a minor for this device.\n");
|
||||
usb_set_intfdata(interface, NULL);
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* let the user know what node this device is now attached to */
|
||||
dev_info(&interface->dev,
|
||||
"USB Skeleton device now attached to USBSkel-%d",
|
||||
interface->minor);
|
||||
return 0;
|
||||
|
||||
error:
|
||||
if (dev)
|
||||
/* this frees allocated memory */
|
||||
kref_put(&dev->kref, skel_delete);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void skel_disconnect(struct usb_interface *interface)
|
||||
{
|
||||
struct usb_skel *dev;
|
||||
int minor = interface->minor;
|
||||
|
||||
dev = usb_get_intfdata(interface);
|
||||
usb_set_intfdata(interface, NULL);
|
||||
|
||||
/* give back our minor */
|
||||
usb_deregister_dev(interface, &skel_class);
|
||||
|
||||
/* prevent more I/O from starting */
|
||||
mutex_lock(&dev->io_mutex);
|
||||
dev->interface = NULL;
|
||||
mutex_unlock(&dev->io_mutex);
|
||||
|
||||
usb_kill_anchored_urbs(&dev->submitted);
|
||||
|
||||
/* decrement our usage count */
|
||||
kref_put(&dev->kref, skel_delete);
|
||||
|
||||
dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor);
|
||||
}
|
||||
|
||||
static void skel_draw_down(struct usb_skel *dev)
|
||||
{
|
||||
int time;
|
||||
|
||||
time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000);
|
||||
if (!time)
|
||||
usb_kill_anchored_urbs(&dev->submitted);
|
||||
usb_kill_urb(dev->bulk_in_urb);
|
||||
}
|
||||
|
||||
static int skel_suspend(struct usb_interface *intf, pm_message_t message)
|
||||
{
|
||||
struct usb_skel *dev = usb_get_intfdata(intf);
|
||||
|
||||
if (!dev)
|
||||
return 0;
|
||||
skel_draw_down(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int skel_resume(struct usb_interface *intf)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int skel_pre_reset(struct usb_interface *intf)
|
||||
{
|
||||
struct usb_skel *dev = usb_get_intfdata(intf);
|
||||
|
||||
mutex_lock(&dev->io_mutex);
|
||||
skel_draw_down(dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int skel_post_reset(struct usb_interface *intf)
|
||||
{
|
||||
struct usb_skel *dev = usb_get_intfdata(intf);
|
||||
|
||||
/* we are sure no URBs are active - no locking needed */
|
||||
dev->errors = -EPIPE;
|
||||
mutex_unlock(&dev->io_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct usb_driver skel_driver = {
|
||||
.name = "skeleton",
|
||||
.probe = skel_probe,
|
||||
.disconnect = skel_disconnect,
|
||||
.suspend = skel_suspend,
|
||||
.resume = skel_resume,
|
||||
.pre_reset = skel_pre_reset,
|
||||
.post_reset = skel_post_reset,
|
||||
.id_table = skel_table,
|
||||
.supports_autosuspend = 1,
|
||||
};
|
||||
|
||||
module_usb_driver(skel_driver);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Add table
Add a link
Reference in a new issue