| /* |
| * 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/init.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); /* fixme oldi_buffer */ |
| } |
| |
| /** 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 { |
| dev->intf = NULL; |
| mutex_unlock(&dev->mtx); |
| } |
| |
| atomic_set(&dev->writes_pending, 0); |
| 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); |