// SPDX-License-Identifier: GPL-2.0+/* * Generic USB driver for report based interrupt in/out devices * like LD Didactic's USB devices. LD Didactic's USB devices are * HID devices which do not use HID report definitons (they use * raw interrupt in and our reports only for communication). * * This driver uses a ring buffer for time critical reading of * interrupt in reports and provides read and write methods for * raw interrupt reports (similar to the Windows HID driver). * Devices based on the book USB COMPLETE by Jan Axelson may need * such a compatibility to the Windows HID driver. * * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> * * Derived from Lego USB Tower driver * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> */ #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);Lines 1–500 of 794. 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// SPDX-License-Identifier: GPL-2.0+ /* * Generic USB driver for report based interrupt in/out devices * like LD Didactic's USB devices. LD Didactic's USB devices are * HID devices which do not use HID report definitons (they use * raw interrupt in and our reports only for communication). * * This driver uses a ring buffer for time critical reading of * interrupt in reports and provides read and write methods for * raw interrupt reports (similar to the Windows HID driver). * Devices based on the book USB COMPLETE by Jan Axelson may need * such a compatibility to the Windows HID driver. * * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> * * Derived from Lego USB Tower driver * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> */ #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);