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![Paul Gortmaker](/assets/img/avatar_default.png)
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
664 lines
16 KiB
C
664 lines
16 KiB
C
/*
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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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/* 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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/* 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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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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/* 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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*/
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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);
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if (!available) {
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/*
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* all data has been used
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* actual IO needs to be done
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*/
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rv = skel_do_read_io(dev, count);
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if (rv < 0)
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goto exit;
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else
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goto retry;
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}
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/*
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* data is available
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* chunk tells us how much shall be copied
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*/
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if (copy_to_user(buffer,
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dev->bulk_in_buffer + dev->bulk_in_copied,
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chunk))
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rv = -EFAULT;
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else
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rv = chunk;
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dev->bulk_in_copied += chunk;
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/*
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* if we are asked for more than we have,
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* we start IO but don't wait
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*/
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if (available < count)
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skel_do_read_io(dev, count - chunk);
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} else {
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/* no data in the buffer */
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rv = skel_do_read_io(dev, count);
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if (rv < 0)
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goto exit;
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else
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goto retry;
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}
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exit:
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mutex_unlock(&dev->io_mutex);
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return rv;
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}
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static void skel_write_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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/* 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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spin_lock(&dev->err_lock);
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dev->errors = urb->status;
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spin_unlock(&dev->err_lock);
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}
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/* free up our allocated buffer */
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usb_free_coherent(urb->dev, urb->transfer_buffer_length,
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urb->transfer_buffer, urb->transfer_dma);
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up(&dev->limit_sem);
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}
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static ssize_t skel_write(struct file *file, const char *user_buffer,
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size_t count, loff_t *ppos)
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{
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struct usb_skel *dev;
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int retval = 0;
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struct urb *urb = NULL;
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char *buf = NULL;
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size_t writesize = min(count, (size_t)MAX_TRANSFER);
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dev = file->private_data;
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/* verify that we actually have some data to write */
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if (count == 0)
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goto exit;
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|
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/*
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* limit the number of URBs in flight to stop a user from using up all
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* RAM
|
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*/
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if (!(file->f_flags & O_NONBLOCK)) {
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if (down_interruptible(&dev->limit_sem)) {
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retval = -ERESTARTSYS;
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goto exit;
|
|
}
|
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} else {
|
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if (down_trylock(&dev->limit_sem)) {
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retval = -EAGAIN;
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goto exit;
|
|
}
|
|
}
|
|
|
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spin_lock_irq(&dev->err_lock);
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retval = dev->errors;
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if (retval < 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 */
|
|
retval = (retval == -EPIPE) ? retval : -EIO;
|
|
}
|
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spin_unlock_irq(&dev->err_lock);
|
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if (retval < 0)
|
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goto error;
|
|
|
|
/* create a urb, and a buffer for it, and copy the data to the urb */
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urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!urb) {
|
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retval = -ENOMEM;
|
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goto error;
|
|
}
|
|
|
|
buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL,
|
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&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);
|
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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,
|
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usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
|
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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");
|