+++ /dev/null
-/*
- * USB Skeleton driver - 2.2
- *
- * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, version 2.
- *
- * This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
- * but has been rewritten to be easier to read and use.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/kref.h>
-#include <linux/uaccess.h>
-#include <linux/usb.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-
-
-/* Define these values to match your devices */
-#define USB_MOCCA_VENDOR_ID 0x184f
-#define USB_MOCCA_PRODUCT_ID_1 0x0007
-#define USB_MOCCA_PRODUCT_ID_2 0x0008
-#define USB_MOCCA_PRODUCT_ID_3 0x0009
-#define USB_MOCCA_PRODUCT_ID_4 0x0010
-#define USB_MOCCA_PRODUCT_ID_5 0x0011
-#define USB_MOCCA_PRODUCT_ID_6 0x0012
-
-/* table of devices that work with this driver */
-static const struct usb_device_id mocca_table[] = {
- { USB_DEVICE(USB_MOCCA_VENDOR_ID, USB_MOCCA_PRODUCT_ID_1) },
- { USB_DEVICE(USB_MOCCA_VENDOR_ID, USB_MOCCA_PRODUCT_ID_2) },
- { USB_DEVICE(USB_MOCCA_VENDOR_ID, USB_MOCCA_PRODUCT_ID_3) },
- { USB_DEVICE(USB_MOCCA_VENDOR_ID, USB_MOCCA_PRODUCT_ID_4) },
- { USB_DEVICE(USB_MOCCA_VENDOR_ID, USB_MOCCA_PRODUCT_ID_5) },
- { USB_DEVICE(USB_MOCCA_VENDOR_ID, USB_MOCCA_PRODUCT_ID_6) },
- { } /* Terminating entry */
-};
-MODULE_DEVICE_TABLE (usb, mocca_table);
-
-
-/* Get a minor range for your devices from the usb maintainer */
-#define USB_MOCCA_MINOR_BASE 221 /*TODO: change this minor number */
-
-/* our private defines. if this grows any larger, use your own .h file */
-#define MAX_TRANSFER ( PAGE_SIZE - 512 )
-#define WRITES_IN_FLIGHT 8
-
-/* Structure to hold all of our device specific stuff */
-struct mocca_skel {
- struct usb_device * udev; /* the usb device for this device */
- struct usb_interface * interface; /* the interface for this device */
- struct semaphore limit_sem; /* limiting the number of writes in progress */
- unsigned char * bulk_in_buffer; /* the buffer to receive data */
- size_t bulk_in_size; /* the size of the receive buffer */
- __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
- __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
- struct kref kref;
-};
-#define to_mocca_dev(d) container_of(d, struct mocca_skel, kref)
-
-static struct usb_driver mocca_driver;
-static spinlock_t spinLock;
-
-static void mocca_delete(struct kref *kref)
-{
- struct mocca_skel *dev = to_mocca_dev(kref);
-
- usb_put_dev(dev->udev);
- kfree (dev->bulk_in_buffer);
- kfree (dev);
-}
-
-static int mocca_open(struct inode *inode, struct file *file)
-{
- struct mocca_skel *dev;
- struct usb_interface *interface;
- int subminor;
- int retval = 0;
-
- subminor = iminor(inode);
-
- interface = usb_find_interface(&mocca_driver, subminor);
- if (!interface) {
- printk(KERN_ERR "%s - error, can't find device for minor %d",
- __FUNCTION__, subminor);
- retval = -ENODEV;
- goto exit;
- }
-
- dev = usb_get_intfdata(interface);
- if (!dev) {
- retval = -ENODEV;
- goto exit;
- }
-
- /* increment our usage count for the device */
- kref_get(&dev->kref);
-
- /* save our object in the file's private structure */
- file->private_data = dev;
-
-exit:
- return retval;
-}
-
-static int mocca_release(struct inode *inode, struct file *file)
-{
- struct mocca_skel *dev;
-
- dev = (struct mocca_skel *)file->private_data;
- if (dev == NULL)
- return -ENODEV;
-
- /* decrement the count on our device */
- kref_put(&dev->kref, mocca_delete);
- return 0;
-}
-
-static ssize_t mocca_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
-{
- struct mocca_skel *dev;
- int retval = 0;
- int bytes_read;
-
- dev = (struct mocca_skel *)file->private_data;
-
- /* do a blocking bulk read to get data from the device */
- retval = usb_bulk_msg(dev->udev,
- usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
- dev->bulk_in_buffer,
- min(dev->bulk_in_size, count),
- &bytes_read, 10000);
-
- /* if the read was successful, copy the data to userspace */
- if (!retval) {
- if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
- retval = -EFAULT;
- else
- retval = bytes_read;
- }
-
- return retval;
-}
-
-static void mocca_write_bulk_callback(struct urb *urb)
-{
- struct mocca_skel *dev;
-
- dev = (struct mocca_skel *)urb->context;
-
- /* sync/async unlink faults aren't errors */
- if (urb->status &&
- !(urb->status == -ENOENT ||
- urb->status == -ECONNRESET ||
- urb->status == -ESHUTDOWN)) {
- printk(KERN_ERR "%s - nonzero write bulk status received: %d",
- __FUNCTION__, urb->status);
- }
-
- /* 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 mocca_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
-{
- struct mocca_skel *dev;
- int retval = 0;
- struct urb *urb = NULL;
- char *buf = NULL;
- size_t writesize = min(count, (size_t)MAX_TRANSFER);
-
- dev = (struct mocca_skel *)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 (down_interruptible(&dev->limit_sem)) {
- retval = -ERESTARTSYS;
- goto exit;
- }
-
- /* 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;
- }
-
- /* initialize the urb properly */
- usb_fill_bulk_urb(urb, dev->udev,
- usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
- buf, writesize, mocca_write_bulk_callback, dev);
- urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
-
- /* send the data out the bulk port */
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (retval) {
- printk(KERN_ERR "%s - failed submitting write urb, error %d", __FUNCTION__, retval);
- goto error;
- }
-
- /* release our reference to this urb, the USB core will eventually free it entirely */
- usb_free_urb(urb);
-
-exit:
- return writesize;
-
-error:
- usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma);
- usb_free_urb(urb);
- up(&dev->limit_sem);
- return retval;
-}
-
-static struct file_operations mocca_fops = {
- .owner = THIS_MODULE,
- .read = mocca_read,
- .write = mocca_write,
- .open = mocca_open,
- .release = mocca_release,
-};
-
-/*
- * 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 mocca_class = {
- .name = "mocca%d",
- .fops = &mocca_fops,
- .minor_base = USB_MOCCA_MINOR_BASE,
-};
-
-static int mocca_probe(struct usb_interface *interface, const struct usb_device_id *id)
-{
- struct mocca_skel *dev = NULL;
- struct usb_host_interface *iface_desc;
- struct usb_endpoint_descriptor *endpoint;
- size_t buffer_size;
- int i;
- int retval = -ENOMEM;
-
- spin_lock_init(&spinLock);
-
- /* allocate memory for our device state and initialize it */
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (dev == NULL) {
- printk(KERN_ERR "Out of memory");
- goto error;
- }
- kref_init(&dev->kref);
- sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
-
- 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 &&
- ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
- == USB_DIR_IN) &&
- ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
- == USB_ENDPOINT_XFER_BULK)) {
- /* we found a bulk in endpoint */
- buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
- 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) {
- printk(KERN_ERR "Could not allocate bulk_in_buffer");
- goto error;
- }
- printk(KERN_INFO "Found bulk-in pipe, adress: %x, max packet size: %d", endpoint->bEndpointAddress, endpoint->wMaxPacketSize);
- }
-
- if (!dev->bulk_out_endpointAddr &&
- ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
- == USB_DIR_OUT) &&
- ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
- == USB_ENDPOINT_XFER_BULK)) {
- /* we found a bulk out endpoint */
- dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
- printk(KERN_INFO "Found bulk-out pipe, adress: %x, max packet size: %d", endpoint->bEndpointAddress, endpoint->wMaxPacketSize);
- }
- }
- if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
- printk(KERN_ERR "Could not find both bulk-in and bulk-out endpoints");
- 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, &mocca_class);
- if (retval) {
- /* something prevented us from registering this driver */
- printk(KERN_ERR "Not able to get a minor for this device.");
- usb_set_intfdata(interface, NULL);
- goto error;
- }
-
- /* let the user know what node this device is now attached to */
- dev_info(&interface->dev,
- "K2L MOCCA device now attached to mocca%d",
- interface->minor);
- return 0;
-
-error:
- if (dev)
- kref_put(&dev->kref, mocca_delete);
- return retval;
-}
-
-static void mocca_disconnect(struct usb_interface *interface)
-{
- struct mocca_skel *dev;
- int minor = interface->minor;
-
- /* prevent mocca_open() from racing mocca_disconnect() */
- spin_lock(&spinLock);
-
- dev = usb_get_intfdata(interface);
- usb_set_intfdata(interface, NULL);
-
- /* give back our minor */
- usb_deregister_dev(interface, &mocca_class);
-
- spin_unlock(&spinLock);
-
- /* decrement our usage count */
- kref_put(&dev->kref, mocca_delete);
-
- dev_info(&interface->dev, "K2L MOCCA device #%d now disconnected", minor);
-}
-
-static struct usb_driver mocca_driver = {
- .name = "k2l-mocca",
- .probe = mocca_probe,
- .disconnect = mocca_disconnect,
- .id_table = mocca_table,
-};
-
-static int __init usb_mocca_init(void)
-{
- int result;
-
- /* register this driver with the USB subsystem */
- result = usb_register(&mocca_driver);
- if (result)
- printk(KERN_ERR "usb_register failed. Error number %d", result);
-
- return result;
-}
-
-static void __exit usb_mocca_exit(void)
-{
- /* deregister this driver with the USB subsystem */
- usb_deregister(&mocca_driver);
-}
-
-module_init (usb_mocca_init);
-module_exit (usb_mocca_exit);
-
-MODULE_LICENSE("GPL");
Code Review / AGL / meta-agl-demo.git / blobdiff