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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/kernel.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/mutex.h>
#include <linux/uaccess.h>#include <linux/input.h>#include <linux/usb.h>#include <linux/poll.h>
/* Define these values to match your devices */#define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */#define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */#define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */#define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */#define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */#define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */#define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */#define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */#define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */#define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */#define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */#define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */#define USB_DEVICE_ID_LD_POWERANALYSERCASSY 0x1040 /* USB Product ID of Power Analyser CASSY */#define USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY 0x1042 /* USB Product ID of Converter Controller CASSY */#define USB_DEVICE_ID_LD_MACHINETESTCASSY 0x1043 /* USB Product ID of Machine Test CASSY */#define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */#define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */#define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */#define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */#define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */#define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */#define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */#define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/#define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */#define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */#define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */#define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */#define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */#define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */#define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */#define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */#define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */#define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */#define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */#define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */#define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */#define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */
#ifdef CONFIG_USB_DYNAMIC_MINORS#define USB_LD_MINOR_BASE 0#else#define USB_LD_MINOR_BASE 176#endif
/* table of devices that work with this driver */static const struct usb_device_id ld_usb_table[] = { { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERANALYSERCASSY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETESTCASSY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) }, { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) }, { } /* Terminating entry */};MODULE_DEVICE_TABLE(usb, ld_usb_table);MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");MODULE_DESCRIPTION("LD USB Driver");MODULE_LICENSE("GPL");
/* 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 = 128;module_param(ring_buffer_size, int, 0000);MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
/* The write_buffer can contain more than one interrupt out transfer. */static int write_buffer_size = 10;module_param(write_buffer_size, int, 0000);MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
/* As of kernel version 2.6.4 ehci-hcd uses an * "only one interrupt transfer per frame" shortcut * to simplify the scheduling of periodic transfers. * This conflicts with our standard 1ms intervals for in and out URBs. * We use default intervals of 2ms for in and 2ms for out transfers, * which should be fast enough. * Increase the interval to allow more devices that do interrupt transfers, * or set to 1 to use the standard interval from the endpoint descriptors. */static int min_interrupt_in_interval = 2;module_param(min_interrupt_in_interval, int, 0000);MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
static int min_interrupt_out_interval = 2;module_param(min_interrupt_out_interval, int, 0000);MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
/* Structure to hold all of our device specific stuff */struct ld_usb { struct kref kref; struct mutex mutex; /* locks this structure */ struct usb_interface *intf; /* save off the usb interface pointer */ unsigned long disconnected:1;
int open_count; /* number of times this port has been opened */
char *ring_buffer; unsigned int ring_head; unsigned int ring_tail;
wait_queue_head_t read_wait; wait_queue_head_t write_wait;
char *interrupt_in_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; int buffer_overflow; spinlock_t rbsl;
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;};
static struct usb_driver ld_usb_driver;
/* * ld_usb_abort_transfers * aborts transfers and frees associated data structures */static void ld_usb_abort_transfers(struct ld_usb *dev){ /* shutdown transfer */ if (dev->interrupt_in_running) { dev->interrupt_in_running = 0; usb_kill_urb(dev->interrupt_in_urb); } if (dev->interrupt_out_busy) usb_kill_urb(dev->interrupt_out_urb);}
/* * ld_usb_delete */static void ld_usb_delete(struct kref *kref){ struct ld_usb *dev = container_of(kref, struct ld_usb, kref);
/* free data structures */ 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);}
/* * ld_usb_interrupt_in_callback */static void ld_usb_interrupt_in_callback(struct urb *urb){ struct ld_usb *dev = urb->context; size_t *actual_buffer; unsigned int next_ring_head; int status = urb->status; unsigned long flags; int retval;
if (status) { if (status == -ENOENT || status == -ECONNRESET || status == -ESHUTDOWN) { goto exit; } else { dev_dbg(&dev->intf->dev, "%s: nonzero status received: %d\n", __func__, status); spin_lock_irqsave(&dev->rbsl, flags); goto resubmit; /* maybe we can recover */ } }
spin_lock_irqsave(&dev->rbsl, flags); if (urb->actual_length > 0) { next_ring_head = (dev->ring_head+1) % ring_buffer_size; if (next_ring_head != dev->ring_tail) { actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_head * (sizeof(size_t)+dev->interrupt_in_endpoint_size)); /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ *actual_buffer = urb->actual_length; memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); dev->ring_head = next_ring_head; dev_dbg(&dev->intf->dev, "%s: received %d bytes\n", __func__, urb->actual_length); } else { dev_warn(&dev->intf->dev, "Ring buffer overflow, %d bytes dropped\n", urb->actual_length); dev->buffer_overflow = 1; } }
resubmit: /* resubmit if we're still running */ if (dev->interrupt_in_running && !dev->buffer_overflow) { retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); if (retval) { dev_err(&dev->intf->dev, "usb_submit_urb failed (%d)\n", retval); dev->buffer_overflow = 1; } } spin_unlock_irqrestore(&dev->rbsl, flags);exit: dev->interrupt_in_done = 1; wake_up_interruptible(&dev->read_wait);}
/* * ld_usb_interrupt_out_callback */static void ld_usb_interrupt_out_callback(struct urb *urb){ struct ld_usb *dev = urb->context; int status = urb->status;
/* sync/async unlink faults aren't errors */ if (status && !(status == -ENOENT || status == -ECONNRESET || status == -ESHUTDOWN)) dev_dbg(&dev->intf->dev, "%s - nonzero write interrupt status received: %d\n", __func__, status);
dev->interrupt_out_busy = 0; wake_up_interruptible(&dev->write_wait);}
/* * ld_usb_open */static int ld_usb_open(struct inode *inode, struct file *file){ struct ld_usb *dev; int subminor; int retval; struct usb_interface *interface;
stream_open(inode, file); subminor = iminor(inode);
interface = usb_find_interface(&ld_usb_driver, subminor);
if (!interface) { printk(KERN_ERR "%s - error, can't find device for minor %d\n", __func__, subminor); return -ENODEV; }
dev = usb_get_intfdata(interface);
if (!dev) return -ENODEV;
/* lock this device */ if (mutex_lock_interruptible(&dev->mutex)) return -ERESTARTSYS;
/* 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; dev->buffer_overflow = 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, ld_usb_interrupt_in_callback, dev, dev->interrupt_in_interval);
dev->interrupt_in_running = 1; dev->interrupt_in_done = 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; }
kref_get(&dev->kref);
/* save device in the file's private structure */ file->private_data = dev;
unlock_exit: mutex_unlock(&dev->mutex);
return retval;}
/* * ld_usb_release */static int ld_usb_release(struct inode *inode, struct file *file){ struct ld_usb *dev; int retval = 0;
dev = file->private_data;
if (dev == NULL) { retval = -ENODEV; goto exit; }
mutex_lock(&dev->mutex);
if (dev->disconnected) goto unlock_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); ld_usb_abort_transfers(dev); dev->open_count = 0;
unlock_exit: mutex_unlock(&dev->mutex); kref_put(&dev->kref, ld_usb_delete);exit: return retval;}
/* * ld_usb_poll */static __poll_t ld_usb_poll(struct file *file, poll_table *wait){ struct ld_usb *dev; __poll_t mask = 0;
dev = file->private_data;
if (dev->disconnected) return EPOLLERR | EPOLLHUP;
poll_wait(file, &dev->read_wait, wait); poll_wait(file, &dev->write_wait, wait);
if (dev->ring_head != dev->ring_tail) mask |= EPOLLIN | EPOLLRDNORM; if (!dev->interrupt_out_busy) mask |= EPOLLOUT | EPOLLWRNORM;
return mask;}
/* * ld_usb_read */static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos){ struct ld_usb *dev; size_t *actual_buffer; size_t bytes_to_read; int retval = 0; int rv;
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->mutex)) { retval = -ERESTARTSYS; goto exit; }
/* verify that the device wasn't unplugged */ if (dev->disconnected) { retval = -ENODEV; printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); goto unlock_exit; }
/* wait for data */ spin_lock_irq(&dev->rbsl); while (dev->ring_head == dev->ring_tail) { dev->interrupt_in_done = 0; spin_unlock_irq(&dev->rbsl); if (file->f_flags & O_NONBLOCK) { retval = -EAGAIN; goto unlock_exit; } retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); if (retval < 0) goto unlock_exit;
spin_lock_irq(&dev->rbsl); } spin_unlock_irq(&dev->rbsl);
/* actual_buffer contains actual_length + interrupt_in_buffer */ actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_tail * (sizeof(size_t)+dev->interrupt_in_endpoint_size)); if (*actual_buffer > dev->interrupt_in_endpoint_size) { retval = -EIO; goto unlock_exit; } bytes_to_read = min(count, *actual_buffer); if (bytes_to_read < *actual_buffer) dev_warn(&dev->intf->dev, "Read buffer overflow, %zu bytes dropped\n", *actual_buffer-bytes_to_read);
/* copy one interrupt_in_buffer from ring_buffer into userspace */ if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { retval = -EFAULT; goto unlock_exit; } retval = bytes_to_read;
spin_lock_irq(&dev->rbsl); dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
if (dev->buffer_overflow) { dev->buffer_overflow = 0; spin_unlock_irq(&dev->rbsl); rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); if (rv < 0) dev->buffer_overflow = 1; } else { spin_unlock_irq(&dev->rbsl); }
unlock_exit: /* unlock the device */ mutex_unlock(&dev->mutex);
exit: return retval;}
/* * ld_usb_write */static ssize_t ld_usb_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos){ struct ld_usb *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->mutex)) { retval = -ERESTARTSYS; goto exit; }
/* verify that the device wasn't unplugged */ if (dev->disconnected) { retval = -ENODEV; printk(KERN_ERR "ldusb: No device or device unplugged %d\n", 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 */ 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, %zu bytes dropped\n", count - bytes_to_write); dev_dbg(&dev->intf->dev, "%s: count = %zu, bytes_to_write = %zu\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) { /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ retval = usb_control_msg(interface_to_usbdev(dev->intf), usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), 9, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 1 << 8, 0, dev->interrupt_out_buffer, bytes_to_write, USB_CTRL_SET_TIMEOUT); if (retval < 0) dev_err(&dev->intf->dev, "Couldn't submit HID_REQ_SET_REPORT %d\n", retval); 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, ld_usb_interrupt_out_callback, dev, dev->interrupt_out_interval);
dev->interrupt_out_busy = 1; 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); goto unlock_exit; } retval = bytes_to_write;
unlock_exit: /* unlock the device */ mutex_unlock(&dev->mutex);
exit: return retval;}
/* file operations needed when we register this driver */static const struct file_operations ld_usb_fops = { .owner = THIS_MODULE, .read = ld_usb_read, .write = ld_usb_write, .open = ld_usb_open, .release = ld_usb_release, .poll = ld_usb_poll,};
/* * 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 ld_usb_class = { .name = "ldusb%d", .fops = &ld_usb_fops, .minor_base = USB_LD_MINOR_BASE,};
/* * ld_usb_probe * * Called by the usb core when a new device is connected that it thinks * this driver might be interested in. */static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id){ struct usb_device *udev = interface_to_usbdev(intf); struct ld_usb *dev = NULL; struct usb_host_interface *iface_desc; char *buffer; int retval = -ENOMEM; int res;
/* allocate memory for our device state and initialize it */
dev = kzalloc_obj(*dev); if (!dev) goto exit;
kref_init(&dev->kref); mutex_init(&dev->mutex); spin_lock_init(&dev->rbsl); dev->intf = intf; init_waitqueue_head(&dev->read_wait); init_waitqueue_head(&dev->write_wait);
/* workaround for early firmware versions on fast computers */ if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) || (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) && (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { buffer = kmalloc(256, GFP_KERNEL); if (!buffer) goto error; /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ usb_string(udev, 255, buffer, 256); kfree(buffer); }
iface_desc = intf->cur_altsetting;
res = usb_find_last_int_in_endpoint(iface_desc, &dev->interrupt_in_endpoint); if (res) { dev_err(&intf->dev, "Interrupt in endpoint not found\n"); retval = res; goto error; }
res = usb_find_last_int_out_endpoint(iface_desc, &dev->interrupt_out_endpoint); if (res) dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); dev->ring_buffer = kcalloc(ring_buffer_size, sizeof(size_t) + dev->interrupt_in_endpoint_size, 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->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); if (!dev->interrupt_in_urb) goto error; dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) : udev->descriptor.bMaxPacketSize0; dev->interrupt_out_buffer = kmalloc_array(write_buffer_size, dev->interrupt_out_endpoint_size, GFP_KERNEL); if (!dev->interrupt_out_buffer) goto error; dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); if (!dev->interrupt_out_urb) goto error; dev->interrupt_in_interval = max_t(int, min_interrupt_in_interval, dev->interrupt_in_endpoint->bInterval); if (dev->interrupt_out_endpoint) dev->interrupt_out_interval = max_t(int, min_interrupt_out_interval, dev->interrupt_out_endpoint->bInterval);
/* we can register the device now, as it is ready */ usb_set_intfdata(intf, dev);
retval = usb_register_dev(intf, &ld_usb_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, "LD USB Device #%d now attached to major %d minor %d\n", (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
exit: return retval;
error: kref_put(&dev->kref, ld_usb_delete);
return retval;}
/* * ld_usb_disconnect * * Called by the usb core when the device is removed from the system. */static void ld_usb_disconnect(struct usb_interface *intf){ struct ld_usb *dev; int minor;
dev = usb_get_intfdata(intf); usb_set_intfdata(intf, NULL);
minor = intf->minor;
/* give back our minor */ usb_deregister_dev(intf, &ld_usb_class);
usb_poison_urb(dev->interrupt_in_urb); usb_poison_urb(dev->interrupt_out_urb);
mutex_lock(&dev->mutex);
dev->disconnected = 1;
if (dev->open_count) { /* wake up pollers */ wake_up_interruptible_all(&dev->read_wait); wake_up_interruptible_all(&dev->write_wait); }
mutex_unlock(&dev->mutex);
kref_put(&dev->kref, ld_usb_delete);
dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", (minor - USB_LD_MINOR_BASE));}
/* usb specific object needed to register this driver with the usb subsystem */static struct usb_driver ld_usb_driver = { .name = "ldusb", .probe = ld_usb_probe, .disconnect = ld_usb_disconnect, .id_table = ld_usb_table,};
module_usb_driver(ld_usb_driver);