diff options
Diffstat (limited to 'recipes-kernel/mocca-usb/_files/mocca_usb.c')
| -rw-r--r-- | recipes-kernel/mocca-usb/_files/mocca_usb.c | 391 |
1 files changed, 0 insertions, 391 deletions
diff --git a/recipes-kernel/mocca-usb/_files/mocca_usb.c b/recipes-kernel/mocca-usb/_files/mocca_usb.c deleted file mode 100644 index 1a6793c8..00000000 --- a/recipes-kernel/mocca-usb/_files/mocca_usb.c +++ /dev/null @@ -1,391 +0,0 @@ -/* - * 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"); |