diff options
Diffstat (limited to 'drivers/staging/frontier/alphatrack.c')
| -rw-r--r-- | drivers/staging/frontier/alphatrack.c | 849 |
1 files changed, 0 insertions, 849 deletions
diff --git a/drivers/staging/frontier/alphatrack.c b/drivers/staging/frontier/alphatrack.c deleted file mode 100644 index 226b23163109..000000000000 --- a/drivers/staging/frontier/alphatrack.c +++ /dev/null @@ -1,849 +0,0 @@ -/* - * Frontier Designs Alphatrack driver - * - * Copyright (C) 2007 Michael Taht (m@taht.net) - * - * Based on the usbled driver and ldusb drivers by - * - * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com) - * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> - * - * The ldusb driver was, in turn, derived from Lego USB Tower driver - * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> - * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> - * - * 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 uses a ring buffer for time critical reading of - * interrupt in reports and provides read and write methods for - * raw interrupt reports. - */ - -/* - * Note: this currently uses a dumb ringbuffer for reads and writes. - * A more optimal driver would cache and kill off outstanding urbs that are - * now invalid, and ignore ones that already were in the queue but valid - * as we only have 30 commands for the alphatrack. In particular this is - * key for getting lights to flash in time as otherwise many commands - * can be buffered up before the light change makes it to the interface. - */ - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/kobject.h> -#include <linux/mutex.h> - -#include <linux/uaccess.h> -#include <linux/input.h> -#include <linux/usb.h> -#include <linux/poll.h> - -#include "alphatrack.h" - -#define VENDOR_ID 0x165b -#define PRODUCT_ID 0xfad1 - -#ifdef CONFIG_USB_DYNAMIC_MINORS -#define USB_ALPHATRACK_MINOR_BASE 0 -#else -/* FIXME 176 - is another driver's minor - apply for that */ -#define USB_ALPHATRACK_MINOR_BASE 176 -#endif - -/* table of devices that work with this driver */ -static const struct usb_device_id usb_alphatrack_table[] = { - {USB_DEVICE(VENDOR_ID, PRODUCT_ID)}, - {} /* Terminating entry */ -}; - -MODULE_DEVICE_TABLE(usb, usb_alphatrack_table); -MODULE_VERSION("0.41"); -MODULE_AUTHOR("Mike Taht <m@taht.net>"); -MODULE_DESCRIPTION("Alphatrack USB Driver"); -MODULE_LICENSE("GPL"); -MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface"); - -/* These aren't done yet */ - -#define SUPPRESS_EXTRA_ONLINE_EVENTS 0 -#define BUFFERED_WRITES 0 -#define SUPPRESS_EXTRA_OFFLINE_EVENTS 0 -#define COMPRESS_FADER_EVENTS 0 - -#define BUFFERED_READS 1 -#define RING_BUFFER_SIZE 512 -#define WRITE_BUFFER_SIZE 34 -#define ALPHATRACK_USB_TIMEOUT 10 -#define OUTPUT_CMD_SIZE 8 -#define INPUT_CMD_SIZE 12 -#define ALPHATRACK_DEBUG 0 - -static int debug = ALPHATRACK_DEBUG; - -/* Use our own dbg macro */ -#define dbg_info(dev, format, arg...) do \ - { if (debug) dev_info(dev , format , ## arg); } while (0) - -#define alphatrack_ocmd_info(dev, cmd, format, arg...) - -#define alphatrack_icmd_info(dev, cmd, format, arg...) - -/* Module parameters */ - -module_param(debug, int, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(debug, "Debug enabled or not"); - -/* - * All interrupt in transfers are collected in a ring buffer to - * avoid racing conditions and get better performance of the driver. - */ - -static int ring_buffer_size = RING_BUFFER_SIZE; - -module_param(ring_buffer_size, int, S_IRUGO); -MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size"); - -/* The write_buffer can one day contain more than one interrupt out transfer.*/ - -static int write_buffer_size = WRITE_BUFFER_SIZE; -module_param(write_buffer_size, int, S_IRUGO); -MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); - -/* - * Increase the interval for debugging purposes. - * or set to 1 to use the standard interval from the endpoint descriptors. - */ - -static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT; -module_param(min_interrupt_in_interval, int, 0); -MODULE_PARM_DESC(min_interrupt_in_interval, - "Minimum interrupt in interval in ms"); - -static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT; -module_param(min_interrupt_out_interval, int, 0); -MODULE_PARM_DESC(min_interrupt_out_interval, - "Minimum interrupt out interval in ms"); - -/* Structure to hold all of our device specific stuff */ - -struct usb_alphatrack { - struct mutex mtx; /* locks this structure */ - struct usb_interface *intf; /* save off the usb interface pointer */ - int open_count; /* number of times this port has been opened */ - - /* make gcc happy */ - struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE]; - struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE]; - unsigned int ring_head; - unsigned int ring_tail; - - wait_queue_head_t read_wait; - wait_queue_head_t write_wait; - - unsigned char *interrupt_in_buffer; - unsigned char *oldi_buffer; - struct usb_endpoint_descriptor *interrupt_in_endpoint; - struct urb *interrupt_in_urb; - int interrupt_in_interval; - size_t interrupt_in_endpoint_size; - int interrupt_in_running; - int interrupt_in_done; - - char *interrupt_out_buffer; - struct usb_endpoint_descriptor *interrupt_out_endpoint; - struct urb *interrupt_out_urb; - int interrupt_out_interval; - size_t interrupt_out_endpoint_size; - int interrupt_out_busy; - - atomic_t writes_pending; - int event; /* alternate interface to events */ - int fader; /* 10 bits */ - int lights; /* 23 bits */ - unsigned char dump_state; /* 0 if disabled 1 if enabled */ - unsigned char enable; /* 0 if disabled 1 if enabled */ - unsigned char offline; /* if the device is out of range or asleep */ - unsigned char verbose; /* be verbose in error reporting */ - unsigned char last_cmd[OUTPUT_CMD_SIZE]; - unsigned char screen[32]; -}; - -/* prevent races between open() and disconnect() */ -static DEFINE_MUTEX(disconnect_mutex); - -/* forward declaration */ - -static struct usb_driver usb_alphatrack_driver; - -/** - * usb_alphatrack_abort_transfers - * aborts transfers and frees associated data structures - */ -static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev) -{ - /* shutdown transfer */ - if (dev->interrupt_in_running) { - dev->interrupt_in_running = 0; - if (dev->intf) - usb_kill_urb(dev->interrupt_in_urb); - } - if (dev->interrupt_out_busy) - if (dev->intf) - usb_kill_urb(dev->interrupt_out_urb); -} - -/** usb_alphatrack_delete */ -static void usb_alphatrack_delete(struct usb_alphatrack *dev) -{ - usb_alphatrack_abort_transfers(dev); - usb_free_urb(dev->interrupt_in_urb); - usb_free_urb(dev->interrupt_out_urb); - kfree(dev->ring_buffer); - kfree(dev->interrupt_in_buffer); - kfree(dev->interrupt_out_buffer); - kfree(dev->oldi_buffer); - kfree(dev->write_buffer); - kfree(dev); -} - -/** usb_alphatrack_interrupt_in_callback */ - -static void usb_alphatrack_interrupt_in_callback(struct urb *urb) -{ - struct usb_alphatrack *dev = urb->context; - unsigned int next_ring_head; - int retval = -1; - - if (urb->status) { - if (urb->status == -ENOENT || - urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) { - goto exit; - } else { - dbg_info(&dev->intf->dev, - "%s: nonzero status received: %d\n", __func__, - urb->status); - goto resubmit; /* maybe we can recover */ - } - } - - if (urb->actual_length != INPUT_CMD_SIZE) { - dev_warn(&dev->intf->dev, - "Urb length was %d bytes!! Do something intelligent\n", - urb->actual_length); - } else { - alphatrack_ocmd_info(&dev->intf->dev, - &(*dev->ring_buffer)[dev->ring_tail].cmd, - "%s", "bla"); - if (memcmp - (dev->interrupt_in_buffer, dev->oldi_buffer, - INPUT_CMD_SIZE) == 0) { - goto resubmit; - } - memcpy(dev->oldi_buffer, dev->interrupt_in_buffer, - INPUT_CMD_SIZE); - -#if SUPPRESS_EXTRA_OFFLINE_EVENTS - if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff) - goto resubmit; - if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) { - dev->offline = 2; - goto resubmit; - } -/* Always pass one offline event up the stack */ - if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff) - dev->offline = 0; - if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff) - dev->offline = 1; -#endif - dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", - __func__, dev->ring_head, dev->ring_tail); - next_ring_head = (dev->ring_head + 1) % ring_buffer_size; - - if (next_ring_head != dev->ring_tail) { - memcpy(&((*dev->ring_buffer)[dev->ring_head]), - dev->interrupt_in_buffer, urb->actual_length); - dev->ring_head = next_ring_head; - retval = 0; - memset(dev->interrupt_in_buffer, 0, urb->actual_length); - } else { - dev_warn(&dev->intf->dev, - "Ring buffer overflow, %d bytes dropped\n", - urb->actual_length); - memset(dev->interrupt_in_buffer, 0, urb->actual_length); - } - } - -resubmit: - /* resubmit if we're still running */ - if (dev->interrupt_in_running && dev->intf) { - retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); - if (retval) - dev_err(&dev->intf->dev, - "usb_submit_urb failed (%d)\n", retval); - } - -exit: - dev->interrupt_in_done = 1; - wake_up_interruptible(&dev->read_wait); -} - -/** usb_alphatrack_interrupt_out_callback */ -static void usb_alphatrack_interrupt_out_callback(struct urb *urb) -{ - struct usb_alphatrack *dev = urb->context; - - /* sync/async unlink faults aren't errors */ - if (urb->status && !(urb->status == -ENOENT || - urb->status == -ECONNRESET || - urb->status == -ESHUTDOWN)) - dbg_info(&dev->intf->dev, - "%s - nonzero write interrupt status received: %d\n", - __func__, urb->status); - atomic_dec(&dev->writes_pending); - dev->interrupt_out_busy = 0; - wake_up_interruptible(&dev->write_wait); -} - -/** usb_alphatrack_open */ -static int usb_alphatrack_open(struct inode *inode, struct file *file) -{ - struct usb_alphatrack *dev; - int subminor; - int retval = 0; - struct usb_interface *interface; - - nonseekable_open(inode, file); - subminor = iminor(inode); - - mutex_lock(&disconnect_mutex); - - interface = usb_find_interface(&usb_alphatrack_driver, subminor); - - if (!interface) { - pr_err("%s - error, can't find device for minor %d\n", - __func__, subminor); - retval = -ENODEV; - goto unlock_disconnect_exit; - } - - dev = usb_get_intfdata(interface); - - if (!dev) { - retval = -ENODEV; - goto unlock_disconnect_exit; - } - - /* lock this device */ - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto unlock_disconnect_exit; - } - - /* allow opening only once */ - if (dev->open_count) { - retval = -EBUSY; - goto unlock_exit; - } - dev->open_count = 1; - - /* initialize in direction */ - dev->ring_head = 0; - dev->ring_tail = 0; - usb_fill_int_urb(dev->interrupt_in_urb, - interface_to_usbdev(interface), - usb_rcvintpipe(interface_to_usbdev(interface), - dev->interrupt_in_endpoint-> - bEndpointAddress), - dev->interrupt_in_buffer, - dev->interrupt_in_endpoint_size, - usb_alphatrack_interrupt_in_callback, dev, - dev->interrupt_in_interval); - - dev->interrupt_in_running = 1; - dev->interrupt_in_done = 0; - dev->enable = 1; - dev->offline = 0; - - retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); - if (retval) { - dev_err(&interface->dev, - "Couldn't submit interrupt_in_urb %d\n", retval); - dev->interrupt_in_running = 0; - dev->open_count = 0; - goto unlock_exit; - } - - /* save device in the file's private structure */ - file->private_data = dev; - -unlock_exit: - mutex_unlock(&dev->mtx); - -unlock_disconnect_exit: - mutex_unlock(&disconnect_mutex); - - return retval; -} - -/** usb_alphatrack_release */ -static int usb_alphatrack_release(struct inode *inode, struct file *file) -{ - struct usb_alphatrack *dev; - int retval = 0; - - dev = file->private_data; - - if (dev == NULL) { - retval = -ENODEV; - goto exit; - } - - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto exit; - } - - if (dev->open_count != 1) { - retval = -ENODEV; - goto unlock_exit; - } - - if (dev->intf == NULL) { - /* the device was unplugged before the file was released */ - mutex_unlock(&dev->mtx); - /* unlock here as usb_alphatrack_delete frees dev */ - usb_alphatrack_delete(dev); - retval = -ENODEV; - goto exit; - } - - /* wait until write transfer is finished */ - if (dev->interrupt_out_busy) - wait_event_interruptible_timeout(dev->write_wait, - !dev->interrupt_out_busy, - 2 * HZ); - usb_alphatrack_abort_transfers(dev); - dev->open_count = 0; - -unlock_exit: - mutex_unlock(&dev->mtx); - -exit: - return retval; -} - -/** usb_alphatrack_poll */ -static unsigned int usb_alphatrack_poll(struct file *file, poll_table *wait) -{ - struct usb_alphatrack *dev; - unsigned int mask = 0; - - dev = file->private_data; - - poll_wait(file, &dev->read_wait, wait); - poll_wait(file, &dev->write_wait, wait); - - if (dev->ring_head != dev->ring_tail) - mask |= POLLIN | POLLRDNORM; - if (!dev->interrupt_out_busy) - mask |= POLLOUT | POLLWRNORM; - - return mask; -} - -/** usb_alphatrack_read */ -static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer, - size_t count, loff_t *ppos) -{ - struct usb_alphatrack *dev; - int retval = 0; - - int c = 0; - - dev = file->private_data; - - /* verify that we actually have some data to read */ - if (count == 0) - goto exit; - - /* lock this object */ - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto exit; - } - - /* verify that the device wasn't unplugged */ - if (dev->intf == NULL) { - retval = -ENODEV; - pr_err("%s: No device or device unplugged %d\n", - __func__, retval); - goto unlock_exit; - } - - while (dev->ring_head == dev->ring_tail) { - if (file->f_flags & O_NONBLOCK) { - retval = -EAGAIN; - goto unlock_exit; - } - dev->interrupt_in_done = 0; - retval = - wait_event_interruptible(dev->read_wait, - dev->interrupt_in_done); - if (retval < 0) - goto unlock_exit; - } - - alphatrack_ocmd_info(&dev->intf->dev, - &(*dev->ring_buffer)[dev->ring_tail].cmd, "%s", - ": copying to userspace"); - - c = 0; - while ((c < count) && (dev->ring_tail != dev->ring_head)) { - if (copy_to_user - (&buffer[c], &(*dev->ring_buffer)[dev->ring_tail], - INPUT_CMD_SIZE)) { - retval = -EFAULT; - goto unlock_exit; - } - dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size; - c += INPUT_CMD_SIZE; - dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", - __func__, dev->ring_head, dev->ring_tail); - } - retval = c; - -unlock_exit: - /* unlock the device */ - mutex_unlock(&dev->mtx); - -exit: - return retval; -} - -/** usb_alphatrack_write */ -static ssize_t usb_alphatrack_write(struct file *file, - const char __user *buffer, size_t count, - loff_t *ppos) -{ - struct usb_alphatrack *dev; - size_t bytes_to_write; - int retval = 0; - - dev = file->private_data; - - /* verify that we actually have some data to write */ - if (count == 0) - goto exit; - - /* lock this object */ - if (mutex_lock_interruptible(&dev->mtx)) { - retval = -ERESTARTSYS; - goto exit; - } - - /* verify that the device wasn't unplugged */ - if (dev->intf == NULL) { - retval = -ENODEV; - pr_err("%s: No device or device unplugged %d\n", - __func__, retval); - goto unlock_exit; - } - - /* wait until previous transfer is finished */ - if (dev->interrupt_out_busy) { - if (file->f_flags & O_NONBLOCK) { - retval = -EAGAIN; - goto unlock_exit; - } - retval = - wait_event_interruptible(dev->write_wait, - !dev->interrupt_out_busy); - if (retval < 0) - goto unlock_exit; - } - - /* write the data into interrupt_out_buffer from userspace */ - /* FIXME - if you write more than 12 bytes this breaks */ - bytes_to_write = - min(count, write_buffer_size * dev->interrupt_out_endpoint_size); - if (bytes_to_write < count) - dev_warn(&dev->intf->dev, - "Write buffer overflow, %zd bytes dropped\n", - count - bytes_to_write); - - dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", - __func__, count, bytes_to_write); - - if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { - retval = -EFAULT; - goto unlock_exit; - } - - if (dev->interrupt_out_endpoint == NULL) { - dev_err(&dev->intf->dev, "Endpoint should not be null!\n"); - goto unlock_exit; - } - - /* send off the urb */ - usb_fill_int_urb(dev->interrupt_out_urb, - interface_to_usbdev(dev->intf), - usb_sndintpipe(interface_to_usbdev(dev->intf), - dev->interrupt_out_endpoint-> - bEndpointAddress), - dev->interrupt_out_buffer, bytes_to_write, - usb_alphatrack_interrupt_out_callback, dev, - dev->interrupt_out_interval); - dev->interrupt_out_busy = 1; - atomic_inc(&dev->writes_pending); - wmb(); - - retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); - if (retval) { - dev->interrupt_out_busy = 0; - dev_err(&dev->intf->dev, - "Couldn't submit interrupt_out_urb %d\n", retval); - atomic_dec(&dev->writes_pending); - goto unlock_exit; - } - retval = bytes_to_write; - -unlock_exit: - /* unlock the device */ - mutex_unlock(&dev->mtx); - -exit: - return retval; -} - -/* file operations needed when we register this driver */ -static const struct file_operations usb_alphatrack_fops = { - .owner = THIS_MODULE, - .read = usb_alphatrack_read, - .write = usb_alphatrack_write, - .open = usb_alphatrack_open, - .release = usb_alphatrack_release, - .poll = usb_alphatrack_poll, - .llseek = no_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 usb_alphatrack_class = { - .name = "alphatrack%d", - .fops = &usb_alphatrack_fops, - .minor_base = USB_ALPHATRACK_MINOR_BASE, -}; - -/** - * usb_alphatrack_probe - * - * Called by the usb core when a new device is connected that it thinks - * this driver might be interested in. - */ -static int usb_alphatrack_probe(struct usb_interface *intf, - const struct usb_device_id *id) -{ - struct usb_device *udev = interface_to_usbdev(intf); - struct usb_alphatrack *dev = NULL; - struct usb_host_interface *iface_desc; - struct usb_endpoint_descriptor *endpoint; - int i; - int true_size; - int retval = -ENOMEM; - - /* allocate memory for our device state and initialize it */ - - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (dev == NULL) - goto exit; - - mutex_init(&dev->mtx); - dev->intf = intf; - init_waitqueue_head(&dev->read_wait); - init_waitqueue_head(&dev->write_wait); - - iface_desc = intf->cur_altsetting; - - /* set up the endpoint information */ - for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { - endpoint = &iface_desc->endpoint[i].desc; - - if (usb_endpoint_is_int_in(endpoint)) - dev->interrupt_in_endpoint = endpoint; - - if (usb_endpoint_is_int_out(endpoint)) - dev->interrupt_out_endpoint = endpoint; - } - if (dev->interrupt_in_endpoint == NULL) { - dev_err(&intf->dev, "Interrupt in endpoint not found\n"); - goto error; - } - if (dev->interrupt_out_endpoint == NULL) - dev_warn(&intf->dev, - "Interrupt out endpoint not found (using control endpoint instead)\n"); - - dev->interrupt_in_endpoint_size = - le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); - - if (dev->interrupt_in_endpoint_size != 64) - dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n"); - - if (ring_buffer_size == 0) - ring_buffer_size = RING_BUFFER_SIZE; - - true_size = min(ring_buffer_size, RING_BUFFER_SIZE); - - /* - * FIXME - there are more usb_alloc routines for dma correctness. - * Needed? - */ - dev->ring_buffer = kmalloc_array(true_size, - sizeof(struct alphatrack_icmd), - GFP_KERNEL); - if (!dev->ring_buffer) - goto error; - - dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, - GFP_KERNEL); - if (!dev->interrupt_in_buffer) - goto error; - - dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); - if (!dev->oldi_buffer) - goto error; - - dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); - if (!dev->interrupt_in_urb) { - dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); - goto error; - } - - dev->interrupt_out_endpoint_size = - dev->interrupt_out_endpoint ? le16_to_cpu(dev-> - interrupt_out_endpoint-> - wMaxPacketSize) : udev-> - descriptor.bMaxPacketSize0; - - if (dev->interrupt_out_endpoint_size != 64) - dev_warn(&intf->dev, - "Interrupt out endpoint size is not 64!)\n"); - - if (write_buffer_size == 0) - write_buffer_size = WRITE_BUFFER_SIZE; - true_size = min(write_buffer_size, WRITE_BUFFER_SIZE); - - dev->interrupt_out_buffer = - kmalloc_array(true_size, - dev->interrupt_out_endpoint_size, - GFP_KERNEL); - if (!dev->interrupt_out_buffer) - goto error; - - dev->write_buffer = kmalloc_array(true_size, - sizeof(struct alphatrack_ocmd), - GFP_KERNEL); - if (!dev->write_buffer) - goto error; - - dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); - if (!dev->interrupt_out_urb) { - dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); - goto error; - } - dev->interrupt_in_interval = - min_interrupt_in_interval > - dev->interrupt_in_endpoint-> - bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint-> - bInterval; - if (dev->interrupt_out_endpoint) - dev->interrupt_out_interval = - min_interrupt_out_interval > - dev->interrupt_out_endpoint-> - bInterval ? min_interrupt_out_interval : dev-> - interrupt_out_endpoint->bInterval; - - /* we can register the device now, as it is ready */ - usb_set_intfdata(intf, dev); - - atomic_set(&dev->writes_pending, 0); - retval = usb_register_dev(intf, &usb_alphatrack_class); - if (retval) { - /* something prevented us from registering this driver */ - dev_err(&intf->dev, - "Not able to get a minor for this device.\n"); - usb_set_intfdata(intf, NULL); - goto error; - } - - /* let the user know what node this device is now attached to */ - dev_info(&intf->dev, - "Alphatrack Device #%d now attached to major %d minor %d\n", - (intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR, - intf->minor); - -exit: - return retval; - -error: - usb_alphatrack_delete(dev); - - return retval; -} - -/** - * usb_alphatrack_disconnect - * - * Called by the usb core when the device is removed from the system. - */ -static void usb_alphatrack_disconnect(struct usb_interface *intf) -{ - struct usb_alphatrack *dev; - int minor; - - mutex_lock(&disconnect_mutex); - - dev = usb_get_intfdata(intf); - usb_set_intfdata(intf, NULL); - - mutex_lock(&dev->mtx); - - minor = intf->minor; - - /* give back our minor */ - usb_deregister_dev(intf, &usb_alphatrack_class); - - /* if the device is not opened, then we clean up right now */ - if (!dev->open_count) { - mutex_unlock(&dev->mtx); - usb_alphatrack_delete(dev); - } else { - atomic_set(&dev->writes_pending, 0); - dev->intf = NULL; - mutex_unlock(&dev->mtx); - } - - mutex_unlock(&disconnect_mutex); - - dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n", - (minor - USB_ALPHATRACK_MINOR_BASE)); -} - -/* usb specific object needed to register this driver with the usb subsystem */ -static struct usb_driver usb_alphatrack_driver = { - .name = "alphatrack", - .probe = usb_alphatrack_probe, - .disconnect = usb_alphatrack_disconnect, - .id_table = usb_alphatrack_table, -}; - -module_usb_driver(usb_alphatrack_driver); |