| /** |
| * 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> |
| * |
| * 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; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * Derived from Lego USB Tower driver |
| * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> |
| * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> |
| * |
| * V0.1 (mh) Initial version |
| * V0.11 (mh) Added raw support for HID 1.0 devices (no interrupt out endpoint) |
| * V0.12 (mh) Added kmalloc check for string buffer |
| * V0.13 (mh) Added support for LD X-Ray and Machine Test System |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| |
| #include <asm/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 */ |
| #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */ |
| #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-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_XRAY1 0x1100 /* USB Product ID of X-Ray Apparatus */ |
| #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus */ |
| #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */ |
| #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_VENDOR_ID_VERNIER 0x08f7 |
| #define USB_DEVICE_ID_VERNIER_LABPRO 0x0001 |
| #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002 |
| #define USB_DEVICE_ID_VERNIER_SKIP 0x0003 |
| #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004 |
| #define USB_DEVICE_ID_VERNIER_LCSPEC 0x0006 |
| |
| #define USB_VENDOR_ID_MICROCHIP 0x04d8 |
| #define USB_DEVICE_ID_PICDEM 0x000c |
| |
| #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 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_POCKETCASSY) }, |
| { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) }, |
| { 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_XRAY1) }, |
| { 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_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_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) }, |
| { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) }, |
| { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) }, |
| { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) }, |
| { USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICDEM) }, |
| { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LCSPEC) }, |
| { } /* Terminating entry */ |
| }; |
| MODULE_DEVICE_TABLE(usb, ld_usb_table); |
| MODULE_VERSION("V0.13"); |
| MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); |
| MODULE_DESCRIPTION("LD USB Driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_SUPPORTED_DEVICE("LD USB Devices"); |
| |
| #ifdef CONFIG_USB_DEBUG |
| static int debug = 1; |
| #else |
| static int debug = 0; |
| #endif |
| |
| /* Use our own dbg macro */ |
| #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0) |
| |
| /* 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 = 128; |
| module_param(ring_buffer_size, int, 0); |
| 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, 0); |
| 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, 0); |
| 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, 0); |
| 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 semaphore sem; /* locks this structure */ |
| struct usb_interface* intf; /* save off the usb interface pointer */ |
| |
| 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; |
| 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); |
| } |
| |
| /** |
| * ld_usb_delete |
| */ |
| static void ld_usb_delete(struct ld_usb *dev) |
| { |
| ld_usb_abort_transfers(dev); |
| |
| /* 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; |
| int retval; |
| |
| if (status) { |
| if (status == -ENOENT || |
| status == -ECONNRESET || |
| status == -ESHUTDOWN) { |
| goto exit; |
| } else { |
| dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n", |
| __func__, status); |
| spin_lock(&dev->rbsl); |
| goto resubmit; /* maybe we can recover */ |
| } |
| } |
| |
| spin_lock(&dev->rbsl); |
| 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; |
| dbg_info(&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 && 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); |
| dev->buffer_overflow = 1; |
| } |
| } |
| spin_unlock(&dev->rbsl); |
| 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)) |
| dbg_info(&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; |
| |
| nonseekable_open(inode, file); |
| subminor = iminor(inode); |
| |
| interface = usb_find_interface(&ld_usb_driver, subminor); |
| |
| if (!interface) { |
| 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 (down_interruptible(&dev->sem)) |
| 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; |
| } |
| |
| /* save device in the file's private structure */ |
| file->private_data = dev; |
| |
| unlock_exit: |
| up(&dev->sem); |
| |
| 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; |
| } |
| |
| if (down_interruptible(&dev->sem)) { |
| 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 */ |
| up(&dev->sem); |
| /* unlock here as ld_usb_delete frees dev */ |
| ld_usb_delete(dev); |
| 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); |
| ld_usb_abort_transfers(dev); |
| dev->open_count = 0; |
| |
| unlock_exit: |
| up(&dev->sem); |
| |
| exit: |
| return retval; |
| } |
| |
| /** |
| * ld_usb_poll |
| */ |
| static unsigned int ld_usb_poll(struct file *file, poll_table *wait) |
| { |
| struct ld_usb *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; |
| } |
| |
| /** |
| * 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 (down_interruptible(&dev->sem)) { |
| retval = -ERESTARTSYS; |
| goto exit; |
| } |
| |
| /* verify that the device wasn't unplugged */ |
| if (dev->intf == NULL) { |
| retval = -ENODEV; |
| err("No device or device unplugged %d\n", retval); |
| goto unlock_exit; |
| } |
| |
| /* wait for data */ |
| spin_lock_irq(&dev->rbsl); |
| if (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; |
| } else { |
| 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)); |
| bytes_to_read = min(count, *actual_buffer); |
| if (bytes_to_read < *actual_buffer) |
| dev_warn(&dev->intf->dev, "Read buffer overflow, %zd 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; |
| } |
| dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; |
| |
| retval = bytes_to_read; |
| |
| spin_lock_irq(&dev->rbsl); |
| 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 */ |
| up(&dev->sem); |
| |
| 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 (down_interruptible(&dev->sem)) { |
| retval = -ERESTARTSYS; |
| goto exit; |
| } |
| |
| /* verify that the device wasn't unplugged */ |
| if (dev->intf == NULL) { |
| retval = -ENODEV; |
| err("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, %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) { |
| /* 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 * HZ); |
| if (retval < 0) |
| err("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; |
| err("Couldn't submit interrupt_out_urb %d\n", retval); |
| goto unlock_exit; |
| } |
| retval = bytes_to_write; |
| |
| unlock_exit: |
| /* unlock the device */ |
| up(&dev->sem); |
| |
| 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; |
| struct usb_endpoint_descriptor *endpoint; |
| char *buffer; |
| int i; |
| int retval = -ENOMEM; |
| |
| /* allocate memory for our device state and intialize it */ |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (dev == NULL) { |
| dev_err(&intf->dev, "Out of memory\n"); |
| goto exit; |
| } |
| init_MUTEX(&dev->sem); |
| 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 == NULL) { |
| dev_err(&intf->dev, "Couldn't allocate string buffer\n"); |
| goto error; |
| } |
| /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ |
| usb_string(udev, 255, buffer, 256); |
| kfree(buffer); |
| } |
| |
| 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); |
| dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL); |
| if (!dev->ring_buffer) { |
| dev_err(&intf->dev, "Couldn't allocate ring_buffer\n"); |
| goto error; |
| } |
| dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); |
| if (!dev->interrupt_in_buffer) { |
| dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); |
| 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; |
| dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL); |
| if (!dev->interrupt_out_buffer) { |
| dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); |
| 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); |
| |
| 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: |
| ld_usb_delete(dev); |
| |
| 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); |
| |
| down(&dev->sem); |
| |
| /* if the device is not opened, then we clean up right now */ |
| if (!dev->open_count) { |
| up(&dev->sem); |
| ld_usb_delete(dev); |
| } else { |
| dev->intf = NULL; |
| up(&dev->sem); |
| } |
| |
| 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, |
| }; |
| |
| /** |
| * ld_usb_init |
| */ |
| static int __init ld_usb_init(void) |
| { |
| int retval; |
| |
| /* register this driver with the USB subsystem */ |
| retval = usb_register(&ld_usb_driver); |
| if (retval) |
| err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval); |
| |
| return retval; |
| } |
| |
| /** |
| * ld_usb_exit |
| */ |
| static void __exit ld_usb_exit(void) |
| { |
| /* deregister this driver with the USB subsystem */ |
| usb_deregister(&ld_usb_driver); |
| } |
| |
| module_init(ld_usb_init); |
| module_exit(ld_usb_exit); |
| |