--- /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