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OpenCloudOS-Kernel/drivers/usb/misc/vstusb.c

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/*****************************************************************************
* File: drivers/usb/misc/vstusb.c
*
* Purpose: Support for the bulk USB Vernier Spectrophotometers
*
* Author: Johnnie Peters
* Axian Consulting
* Beaverton, OR, USA 97005
*
* Modified by: EQware Engineering, Inc.
* Oregon City, OR, USA 97045
*
* Copyright: 2007, 2008
* Vernier Software & Technology
* Beaverton, OR, USA 97005
*
* Web: www.vernier.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*****************************************************************************/
#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 <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/vstusb.h>
#define DRIVER_VERSION "VST USB Driver Version 1.5"
#define DRIVER_DESC "Vernier Software Technology Bulk USB Driver"
#ifdef CONFIG_USB_DYNAMIC_MINORS
#define VSTUSB_MINOR_BASE 0
#else
#define VSTUSB_MINOR_BASE 199
#endif
#define USB_VENDOR_OCEANOPTICS 0x2457
#define USB_VENDOR_VERNIER 0x08F7 /* Vernier Software & Technology */
#define USB_PRODUCT_USB2000 0x1002
#define USB_PRODUCT_ADC1000_FW 0x1003 /* firmware download (renumerates) */
#define USB_PRODUCT_ADC1000 0x1004
#define USB_PRODUCT_HR2000_FW 0x1009 /* firmware download (renumerates) */
#define USB_PRODUCT_HR2000 0x100A
#define USB_PRODUCT_HR4000_FW 0x1011 /* firmware download (renumerates) */
#define USB_PRODUCT_HR4000 0x1012
#define USB_PRODUCT_USB650 0x1014 /* "Red Tide" */
#define USB_PRODUCT_QE65000 0x1018
#define USB_PRODUCT_USB4000 0x1022
#define USB_PRODUCT_USB325 0x1024 /* "Vernier Spectrometer" */
#define USB_PRODUCT_LABPRO 0x0001
#define USB_PRODUCT_LABQUEST 0x0005
#define VST_MAXBUFFER (64*1024)
static struct usb_device_id id_table[] = {
{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB2000)},
{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_HR4000)},
{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB650)},
{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB4000)},
{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB325)},
{ USB_DEVICE(USB_VENDOR_VERNIER, USB_PRODUCT_LABQUEST)},
{ USB_DEVICE(USB_VENDOR_VERNIER, USB_PRODUCT_LABPRO)},
{},
};
MODULE_DEVICE_TABLE(usb, id_table);
struct vstusb_device {
struct kref kref;
struct mutex lock;
struct usb_device *usb_dev;
char present;
char isopen;
struct usb_anchor submitted;
int rd_pipe;
int rd_timeout_ms;
int wr_pipe;
int wr_timeout_ms;
};
#define to_vst_dev(d) container_of(d, struct vstusb_device, kref)
static struct usb_driver vstusb_driver;
static void vstusb_delete(struct kref *kref)
{
struct vstusb_device *vstdev = to_vst_dev(kref);
usb_put_dev(vstdev->usb_dev);
kfree(vstdev);
}
static int vstusb_open(struct inode *inode, struct file *file)
{
struct vstusb_device *vstdev;
struct usb_interface *interface;
interface = usb_find_interface(&vstusb_driver, iminor(inode));
if (!interface) {
printk(KERN_ERR KBUILD_MODNAME
": %s - error, can't find device for minor %d\n",
__func__, iminor(inode));
return -ENODEV;
}
vstdev = usb_get_intfdata(interface);
if (!vstdev)
return -ENODEV;
/* lock this device */
mutex_lock(&vstdev->lock);
/* can only open one time */
if ((!vstdev->present) || (vstdev->isopen)) {
mutex_unlock(&vstdev->lock);
return -EBUSY;
}
/* increment our usage count */
kref_get(&vstdev->kref);
vstdev->isopen = 1;
/* save device in the file's private structure */
file->private_data = vstdev;
dev_dbg(&vstdev->usb_dev->dev, "%s: opened\n", __func__);
mutex_unlock(&vstdev->lock);
return 0;
}
static int vstusb_release(struct inode *inode, struct file *file)
{
struct vstusb_device *vstdev;
vstdev = file->private_data;
if (vstdev == NULL)
return -ENODEV;
mutex_lock(&vstdev->lock);
vstdev->isopen = 0;
dev_dbg(&vstdev->usb_dev->dev, "%s: released\n", __func__);
mutex_unlock(&vstdev->lock);
kref_put(&vstdev->kref, vstusb_delete);
return 0;
}
static void usb_api_blocking_completion(struct urb *urb)
{
struct completion *completeit = urb->context;
complete(completeit);
}
static int vstusb_fill_and_send_urb(struct urb *urb,
struct usb_device *usb_dev,
unsigned int pipe, void *data,
unsigned int len, struct completion *done)
{
struct usb_host_endpoint *ep;
struct usb_host_endpoint **hostep;
unsigned int pipend;
int status;
hostep = usb_pipein(pipe) ? usb_dev->ep_in : usb_dev->ep_out;
pipend = usb_pipeendpoint(pipe);
ep = hostep[pipend];
if (!ep || (len == 0))
return -EINVAL;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_INT) {
pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
usb_fill_int_urb(urb, usb_dev, pipe, data, len,
(usb_complete_t)usb_api_blocking_completion,
NULL, ep->desc.bInterval);
} else
usb_fill_bulk_urb(urb, usb_dev, pipe, data, len,
(usb_complete_t)usb_api_blocking_completion,
NULL);
init_completion(done);
urb->context = done;
urb->actual_length = 0;
status = usb_submit_urb(urb, GFP_KERNEL);
return status;
}
static int vstusb_complete_urb(struct urb *urb, struct completion *done,
int timeout, int *actual_length)
{
unsigned long expire;
int status;
expire = timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT;
if (!wait_for_completion_interruptible_timeout(done, expire)) {
usb_kill_urb(urb);
status = urb->status == -ENOENT ? -ETIMEDOUT : urb->status;
dev_dbg(&urb->dev->dev,
"%s timed out on ep%d%s len=%d/%d, urb status = %d\n",
current->comm,
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
urb->actual_length,
urb->transfer_buffer_length,
urb->status);
} else {
if (signal_pending(current)) {
/* if really an error */
if (urb->status && !((urb->status == -ENOENT) ||
(urb->status == -ECONNRESET) ||
(urb->status == -ESHUTDOWN))) {
status = -EINTR;
usb_kill_urb(urb);
} else {
status = 0;
}
dev_dbg(&urb->dev->dev,
"%s: signal pending on ep%d%s len=%d/%d,"
"urb status = %d\n",
current->comm,
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
urb->actual_length,
urb->transfer_buffer_length,
urb->status);
} else {
status = urb->status;
}
}
if (actual_length)
*actual_length = urb->actual_length;
return status;
}
static ssize_t vstusb_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
struct vstusb_device *vstdev;
int cnt = -1;
void *buf;
int retval = 0;
struct urb *urb;
struct usb_device *dev;
unsigned int pipe;
int timeout;
DECLARE_COMPLETION_ONSTACK(done);
vstdev = file->private_data;
if (vstdev == NULL)
return -ENODEV;
/* verify that we actually want to read some data */
if ((count == 0) || (count > VST_MAXBUFFER))
return -EINVAL;
/* lock this object */
if (mutex_lock_interruptible(&vstdev->lock))
return -ERESTARTSYS;
/* anyone home */
if (!vstdev->present) {
mutex_unlock(&vstdev->lock);
printk(KERN_ERR KBUILD_MODNAME
": %s: device not present\n", __func__);
return -ENODEV;
}
/* pull out the necessary data */
dev = vstdev->usb_dev;
pipe = usb_rcvbulkpipe(dev, vstdev->rd_pipe);
timeout = vstdev->rd_timeout_ms;
buf = kmalloc(count, GFP_KERNEL);
if (buf == NULL) {
mutex_unlock(&vstdev->lock);
return -ENOMEM;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(buf);
mutex_unlock(&vstdev->lock);
return -ENOMEM;
}
usb_anchor_urb(urb, &vstdev->submitted);
retval = vstusb_fill_and_send_urb(urb, dev, pipe, buf, count, &done);
mutex_unlock(&vstdev->lock);
if (retval) {
usb_unanchor_urb(urb);
dev_err(&dev->dev, "%s: error %d filling and sending urb %d\n",
__func__, retval, pipe);
goto exit;
}
retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
if (retval) {
dev_err(&dev->dev, "%s: error %d completing urb %d\n",
__func__, retval, pipe);
goto exit;
}
if (copy_to_user(buffer, buf, cnt)) {
dev_err(&dev->dev, "%s: can't copy_to_user\n", __func__);
retval = -EFAULT;
} else {
retval = cnt;
dev_dbg(&dev->dev, "%s: read %d bytes from pipe %d\n",
__func__, cnt, pipe);
}
exit:
usb_free_urb(urb);
kfree(buf);
return retval;
}
static ssize_t vstusb_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
struct vstusb_device *vstdev;
int cnt = -1;
void *buf;
int retval = 0;
struct urb *urb;
struct usb_device *dev;
unsigned int pipe;
int timeout;
DECLARE_COMPLETION_ONSTACK(done);
vstdev = file->private_data;
if (vstdev == NULL)
return -ENODEV;
/* verify that we actually have some data to write */
if ((count == 0) || (count > VST_MAXBUFFER))
return retval;
/* lock this object */
if (mutex_lock_interruptible(&vstdev->lock))
return -ERESTARTSYS;
/* anyone home */
if (!vstdev->present) {
mutex_unlock(&vstdev->lock);
printk(KERN_ERR KBUILD_MODNAME
": %s: device not present\n", __func__);
return -ENODEV;
}
/* pull out the necessary data */
dev = vstdev->usb_dev;
pipe = usb_sndbulkpipe(dev, vstdev->wr_pipe);
timeout = vstdev->wr_timeout_ms;
buf = kmalloc(count, GFP_KERNEL);
if (buf == NULL) {
mutex_unlock(&vstdev->lock);
return -ENOMEM;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(buf);
mutex_unlock(&vstdev->lock);
return -ENOMEM;
}
if (copy_from_user(buf, buffer, count)) {
dev_err(&dev->dev, "%s: can't copy_from_user\n", __func__);
retval = -EFAULT;
goto exit;
}
usb_anchor_urb(urb, &vstdev->submitted);
retval = vstusb_fill_and_send_urb(urb, dev, pipe, buf, count, &done);
mutex_unlock(&vstdev->lock);
if (retval) {
usb_unanchor_urb(urb);
dev_err(&dev->dev, "%s: error %d filling and sending urb %d\n",
__func__, retval, pipe);
goto exit;
}
retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
if (retval) {
dev_err(&dev->dev, "%s: error %d completing urb %d\n",
__func__, retval, pipe);
goto exit;
} else {
retval = cnt;
dev_dbg(&dev->dev, "%s: sent %d bytes to pipe %d\n",
__func__, cnt, pipe);
}
exit:
usb_free_urb(urb);
kfree(buf);
return retval;
}
static long vstusb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int retval = 0;
int cnt = -1;
void __user *data = (void __user *)arg;
struct vstusb_args usb_data;
struct vstusb_device *vstdev;
void *buffer = NULL; /* must be initialized. buffer is
* referenced on exit but not all
* ioctls allocate it */
struct urb *urb = NULL; /* must be initialized. urb is
* referenced on exit but not all
* ioctls allocate it */
struct usb_device *dev;
unsigned int pipe;
int timeout;
DECLARE_COMPLETION_ONSTACK(done);
vstdev = file->private_data;
if (_IOC_TYPE(cmd) != VST_IOC_MAGIC) {
dev_warn(&vstdev->usb_dev->dev,
"%s: ioctl command %x, bad ioctl magic %x, "
"expected %x\n", __func__, cmd,
_IOC_TYPE(cmd), VST_IOC_MAGIC);
return -EINVAL;
}
if (vstdev == NULL)
return -ENODEV;
if (copy_from_user(&usb_data, data, sizeof(struct vstusb_args))) {
dev_err(&vstdev->usb_dev->dev, "%s: can't copy_from_user\n",
__func__);
return -EFAULT;
}
/* lock this object */
if (mutex_lock_interruptible(&vstdev->lock)) {
retval = -ERESTARTSYS;
goto exit;
}
/* anyone home */
if (!vstdev->present) {
mutex_unlock(&vstdev->lock);
dev_err(&vstdev->usb_dev->dev, "%s: device not present\n",
__func__);
retval = -ENODEV;
goto exit;
}
/* pull out the necessary data */
dev = vstdev->usb_dev;
switch (cmd) {
case IOCTL_VSTUSB_CONFIG_RW:
vstdev->rd_pipe = usb_data.rd_pipe;
vstdev->rd_timeout_ms = usb_data.rd_timeout_ms;
vstdev->wr_pipe = usb_data.wr_pipe;
vstdev->wr_timeout_ms = usb_data.wr_timeout_ms;
mutex_unlock(&vstdev->lock);
dev_dbg(&dev->dev, "%s: setting pipes/timeouts, "
"rdpipe = %d, rdtimeout = %d, "
"wrpipe = %d, wrtimeout = %d\n", __func__,
vstdev->rd_pipe, vstdev->rd_timeout_ms,
vstdev->wr_pipe, vstdev->wr_timeout_ms);
break;
case IOCTL_VSTUSB_SEND_PIPE:
if ((usb_data.count == 0) || (usb_data.count > VST_MAXBUFFER)) {
mutex_unlock(&vstdev->lock);
retval = -EINVAL;
goto exit;
}
buffer = kmalloc(usb_data.count, GFP_KERNEL);
if (buffer == NULL) {
mutex_unlock(&vstdev->lock);
retval = -ENOMEM;
goto exit;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
mutex_unlock(&vstdev->lock);
retval = -ENOMEM;
goto exit;
}
timeout = usb_data.timeout_ms;
pipe = usb_sndbulkpipe(dev, usb_data.pipe);
if (copy_from_user(buffer, usb_data.buffer, usb_data.count)) {
dev_err(&dev->dev, "%s: can't copy_from_user\n",
__func__);
mutex_unlock(&vstdev->lock);
retval = -EFAULT;
goto exit;
}
usb_anchor_urb(urb, &vstdev->submitted);
retval = vstusb_fill_and_send_urb(urb, dev, pipe, buffer,
usb_data.count, &done);
mutex_unlock(&vstdev->lock);
if (retval) {
usb_unanchor_urb(urb);
dev_err(&dev->dev,
"%s: error %d filling and sending urb %d\n",
__func__, retval, pipe);
goto exit;
}
retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
if (retval) {
dev_err(&dev->dev, "%s: error %d completing urb %d\n",
__func__, retval, pipe);
}
break;
case IOCTL_VSTUSB_RECV_PIPE:
if ((usb_data.count == 0) || (usb_data.count > VST_MAXBUFFER)) {
mutex_unlock(&vstdev->lock);
retval = -EINVAL;
goto exit;
}
buffer = kmalloc(usb_data.count, GFP_KERNEL);
if (buffer == NULL) {
mutex_unlock(&vstdev->lock);
retval = -ENOMEM;
goto exit;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
mutex_unlock(&vstdev->lock);
retval = -ENOMEM;
goto exit;
}
timeout = usb_data.timeout_ms;
pipe = usb_rcvbulkpipe(dev, usb_data.pipe);
usb_anchor_urb(urb, &vstdev->submitted);
retval = vstusb_fill_and_send_urb(urb, dev, pipe, buffer,
usb_data.count, &done);
mutex_unlock(&vstdev->lock);
if (retval) {
usb_unanchor_urb(urb);
dev_err(&dev->dev,
"%s: error %d filling and sending urb %d\n",
__func__, retval, pipe);
goto exit;
}
retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
if (retval) {
dev_err(&dev->dev, "%s: error %d completing urb %d\n",
__func__, retval, pipe);
goto exit;
}
if (copy_to_user(usb_data.buffer, buffer, cnt)) {
dev_err(&dev->dev, "%s: can't copy_to_user\n",
__func__);
retval = -EFAULT;
goto exit;
}
usb_data.count = cnt;
if (copy_to_user(data, &usb_data, sizeof(struct vstusb_args))) {
dev_err(&dev->dev, "%s: can't copy_to_user\n",
__func__);
retval = -EFAULT;
} else {
dev_dbg(&dev->dev, "%s: recv %zd bytes from pipe %d\n",
__func__, usb_data.count, usb_data.pipe);
}
break;
default:
mutex_unlock(&vstdev->lock);
dev_warn(&dev->dev, "ioctl_vstusb: invalid ioctl cmd %x\n",
cmd);
return -EINVAL;
break;
}
exit:
usb_free_urb(urb);
kfree(buffer);
return retval;
}
static const struct file_operations vstusb_fops = {
.owner = THIS_MODULE,
.read = vstusb_read,
.write = vstusb_write,
.unlocked_ioctl = vstusb_ioctl,
.compat_ioctl = vstusb_ioctl,
.open = vstusb_open,
.release = vstusb_release,
};
static struct usb_class_driver usb_vstusb_class = {
.name = "usb/vstusb%d",
.fops = &vstusb_fops,
.minor_base = VSTUSB_MINOR_BASE,
};
static int vstusb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct vstusb_device *vstdev;
int i;
int retval = 0;
/* allocate memory for our device state and intialize it */
vstdev = kzalloc(sizeof(*vstdev), GFP_KERNEL);
if (vstdev == NULL)
return -ENOMEM;
/* must do usb_get_dev() prior to kref_init() since the kref_put()
* release function will do a usb_put_dev() */
usb_get_dev(dev);
kref_init(&vstdev->kref);
mutex_init(&vstdev->lock);
i = dev->descriptor.bcdDevice;
dev_dbg(&intf->dev, "Version %1d%1d.%1d%1d found at address %d\n",
(i & 0xF000) >> 12, (i & 0xF00) >> 8,
(i & 0xF0) >> 4, (i & 0xF), dev->devnum);
vstdev->present = 1;
vstdev->isopen = 0;
vstdev->usb_dev = dev;
init_usb_anchor(&vstdev->submitted);
usb_set_intfdata(intf, vstdev);
retval = usb_register_dev(intf, &usb_vstusb_class);
if (retval) {
dev_err(&intf->dev,
"%s: Not able to get a minor for this device.\n",
__func__);
usb_set_intfdata(intf, NULL);
kref_put(&vstdev->kref, vstusb_delete);
return retval;
}
/* let the user know what node this device is now attached to */
dev_info(&intf->dev,
"VST USB Device #%d now attached to major %d minor %d\n",
(intf->minor - VSTUSB_MINOR_BASE), USB_MAJOR, intf->minor);
dev_info(&intf->dev, "%s, %s\n", DRIVER_DESC, DRIVER_VERSION);
return retval;
}
static void vstusb_disconnect(struct usb_interface *intf)
{
struct vstusb_device *vstdev = usb_get_intfdata(intf);
usb_deregister_dev(intf, &usb_vstusb_class);
usb_set_intfdata(intf, NULL);
if (vstdev) {
mutex_lock(&vstdev->lock);
vstdev->present = 0;
usb_kill_anchored_urbs(&vstdev->submitted);
mutex_unlock(&vstdev->lock);
kref_put(&vstdev->kref, vstusb_delete);
}
}
static int vstusb_suspend(struct usb_interface *intf, pm_message_t message)
{
struct vstusb_device *vstdev = usb_get_intfdata(intf);
int time;
if (!vstdev)
return 0;
mutex_lock(&vstdev->lock);
time = usb_wait_anchor_empty_timeout(&vstdev->submitted, 1000);
if (!time)
usb_kill_anchored_urbs(&vstdev->submitted);
mutex_unlock(&vstdev->lock);
return 0;
}
static int vstusb_resume(struct usb_interface *intf)
{
return 0;
}
static struct usb_driver vstusb_driver = {
.name = "vstusb",
.probe = vstusb_probe,
.disconnect = vstusb_disconnect,
.suspend = vstusb_suspend,
.resume = vstusb_resume,
.id_table = id_table,
};
static int __init vstusb_init(void)
{
int rc;
rc = usb_register(&vstusb_driver);
if (rc)
printk(KERN_ERR "%s: failed to register (%d)", __func__, rc);
return rc;
}
static void __exit vstusb_exit(void)
{
usb_deregister(&vstusb_driver);
}
module_init(vstusb_init);
module_exit(vstusb_exit);
MODULE_AUTHOR("Dennis O'Brien/Stephen Ware");
MODULE_DESCRIPTION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
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