linux/drivers/usb/misc/ldusb.c

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/**
* 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_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) },
{ } /* 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;
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;
};
/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);
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
*/
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
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 retval;
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",
__FUNCTION__, urb->status);
goto resubmit; /* maybe we can recover */
}
}
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",
__FUNCTION__, urb->actual_length);
} else
dev_warn(&dev->intf->dev,
"Ring buffer overflow, %d bytes dropped\n",
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);
}
/**
* ld_usb_interrupt_out_callback
*/
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
static void ld_usb_interrupt_out_callback(struct urb *urb)
{
struct ld_usb *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",
__FUNCTION__, urb->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 = 0;
struct usb_interface *interface;
nonseekable_open(inode, file);
subminor = iminor(inode);
mutex_lock(&disconnect_mutex);
interface = usb_find_interface(&ld_usb_driver, subminor);
if (!interface) {
err("%s - error, can't find device for minor %d\n",
__FUNCTION__, subminor);
retval = -ENODEV;
goto unlock_disconnect_exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto unlock_disconnect_exit;
}
/* lock this device */
if (down_interruptible(&dev->sem)) {
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,
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);
unlock_disconnect_exit:
mutex_unlock(&disconnect_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;
}
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;
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 */
if (dev->ring_head == dev->ring_tail) {
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;
}
/* 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;
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", __FUNCTION__, 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);
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;
mutex_lock(&disconnect_mutex);
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
down(&dev->sem);
minor = intf->minor;
/* give back our minor */
usb_deregister_dev(intf, &ld_usb_class);
/* 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);
}
mutex_unlock(&disconnect_mutex);
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);