![Ingo Molnar](/assets/img/avatar_default.png)
Fix up affected files that include this signal functionality via sched.h. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
822 lines
22 KiB
C
822 lines
22 KiB
C
/*
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* adutux - driver for ADU devices from Ontrak Control Systems
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* This is an experimental driver. Use at your own risk.
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* This driver is not supported by Ontrak Control Systems.
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*
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* Copyright (c) 2003 John Homppi (SCO, leave this notice here)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* derived from the Lego USB Tower driver 0.56:
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* Copyright (c) 2003 David Glance <davidgsf@sourceforge.net>
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* 2001 Juergen Stuber <stuber@loria.fr>
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* that was derived from USB Skeleton driver - 0.5
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* Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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/* Version Information */
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#define DRIVER_VERSION "v0.0.13"
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#define DRIVER_AUTHOR "John Homppi"
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#define DRIVER_DESC "adutux (see www.ontrak.net)"
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/* Define these values to match your device */
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#define ADU_VENDOR_ID 0x0a07
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#define ADU_PRODUCT_ID 0x0064
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/* table of devices that work with this driver */
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static const struct usb_device_id device_table[] = {
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{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */
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{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */
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{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */
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{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */
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{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */
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{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, device_table);
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#ifdef CONFIG_USB_DYNAMIC_MINORS
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#define ADU_MINOR_BASE 0
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#else
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#define ADU_MINOR_BASE 67
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#endif
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/* we can have up to this number of device plugged in at once */
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#define MAX_DEVICES 16
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#define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */
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/*
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* The locking scheme is a vanilla 3-lock:
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* adu_device.buflock: A spinlock, covers what IRQs touch.
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* adutux_mutex: A Static lock to cover open_count. It would also cover
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* any globals, but we don't have them in 2.6.
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* adu_device.mtx: A mutex to hold across sleepers like copy_from_user.
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* It covers all of adu_device, except the open_count
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* and what .buflock covers.
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*/
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/* Structure to hold all of our device specific stuff */
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struct adu_device {
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struct mutex mtx;
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struct usb_device *udev; /* save off the usb device pointer */
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struct usb_interface *interface;
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unsigned int minor; /* the starting minor number for this device */
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char serial_number[8];
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int open_count; /* number of times this port has been opened */
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char *read_buffer_primary;
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int read_buffer_length;
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char *read_buffer_secondary;
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int secondary_head;
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int secondary_tail;
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spinlock_t buflock;
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wait_queue_head_t read_wait;
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wait_queue_head_t write_wait;
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char *interrupt_in_buffer;
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struct usb_endpoint_descriptor *interrupt_in_endpoint;
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struct urb *interrupt_in_urb;
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int read_urb_finished;
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char *interrupt_out_buffer;
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struct usb_endpoint_descriptor *interrupt_out_endpoint;
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struct urb *interrupt_out_urb;
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int out_urb_finished;
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};
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static DEFINE_MUTEX(adutux_mutex);
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static struct usb_driver adu_driver;
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static inline void adu_debug_data(struct device *dev, const char *function,
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int size, const unsigned char *data)
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{
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dev_dbg(dev, "%s - length = %d, data = %*ph\n",
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function, size, size, data);
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}
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/**
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* adu_abort_transfers
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* aborts transfers and frees associated data structures
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*/
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static void adu_abort_transfers(struct adu_device *dev)
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{
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unsigned long flags;
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if (dev->udev == NULL)
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return;
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/* shutdown transfer */
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/* XXX Anchor these instead */
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spin_lock_irqsave(&dev->buflock, flags);
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if (!dev->read_urb_finished) {
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spin_unlock_irqrestore(&dev->buflock, flags);
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usb_kill_urb(dev->interrupt_in_urb);
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} else
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spin_unlock_irqrestore(&dev->buflock, flags);
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spin_lock_irqsave(&dev->buflock, flags);
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if (!dev->out_urb_finished) {
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spin_unlock_irqrestore(&dev->buflock, flags);
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usb_kill_urb(dev->interrupt_out_urb);
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} else
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spin_unlock_irqrestore(&dev->buflock, flags);
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}
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static void adu_delete(struct adu_device *dev)
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{
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/* free data structures */
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usb_free_urb(dev->interrupt_in_urb);
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usb_free_urb(dev->interrupt_out_urb);
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kfree(dev->read_buffer_primary);
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kfree(dev->read_buffer_secondary);
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kfree(dev->interrupt_in_buffer);
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kfree(dev->interrupt_out_buffer);
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kfree(dev);
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}
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static void adu_interrupt_in_callback(struct urb *urb)
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{
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struct adu_device *dev = urb->context;
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int status = urb->status;
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adu_debug_data(&dev->udev->dev, __func__,
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urb->actual_length, urb->transfer_buffer);
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spin_lock(&dev->buflock);
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if (status != 0) {
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if ((status != -ENOENT) && (status != -ECONNRESET) &&
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(status != -ESHUTDOWN)) {
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dev_dbg(&dev->udev->dev,
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"%s : nonzero status received: %d\n",
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__func__, status);
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}
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goto exit;
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}
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if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
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if (dev->read_buffer_length <
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(4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
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(urb->actual_length)) {
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memcpy (dev->read_buffer_primary +
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dev->read_buffer_length,
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dev->interrupt_in_buffer, urb->actual_length);
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dev->read_buffer_length += urb->actual_length;
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dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__,
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urb->actual_length);
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} else {
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dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n",
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__func__);
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}
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}
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exit:
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dev->read_urb_finished = 1;
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spin_unlock(&dev->buflock);
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/* always wake up so we recover from errors */
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wake_up_interruptible(&dev->read_wait);
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}
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static void adu_interrupt_out_callback(struct urb *urb)
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{
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struct adu_device *dev = urb->context;
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int status = urb->status;
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adu_debug_data(&dev->udev->dev, __func__,
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urb->actual_length, urb->transfer_buffer);
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if (status != 0) {
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if ((status != -ENOENT) &&
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(status != -ECONNRESET)) {
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dev_dbg(&dev->udev->dev,
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"%s :nonzero status received: %d\n", __func__,
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status);
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}
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return;
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}
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spin_lock(&dev->buflock);
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dev->out_urb_finished = 1;
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wake_up(&dev->write_wait);
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spin_unlock(&dev->buflock);
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}
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static int adu_open(struct inode *inode, struct file *file)
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{
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struct adu_device *dev = NULL;
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struct usb_interface *interface;
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int subminor;
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int retval;
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subminor = iminor(inode);
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retval = mutex_lock_interruptible(&adutux_mutex);
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if (retval)
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goto exit_no_lock;
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interface = usb_find_interface(&adu_driver, subminor);
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if (!interface) {
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pr_err("%s - error, can't find device for minor %d\n",
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__func__, subminor);
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retval = -ENODEV;
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goto exit_no_device;
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}
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dev = usb_get_intfdata(interface);
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if (!dev || !dev->udev) {
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retval = -ENODEV;
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goto exit_no_device;
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}
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/* check that nobody else is using the device */
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if (dev->open_count) {
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retval = -EBUSY;
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goto exit_no_device;
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}
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++dev->open_count;
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dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__,
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dev->open_count);
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/* save device in the file's private structure */
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file->private_data = dev;
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/* initialize in direction */
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dev->read_buffer_length = 0;
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/* fixup first read by having urb waiting for it */
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usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
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usb_rcvintpipe(dev->udev,
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dev->interrupt_in_endpoint->bEndpointAddress),
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dev->interrupt_in_buffer,
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usb_endpoint_maxp(dev->interrupt_in_endpoint),
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adu_interrupt_in_callback, dev,
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dev->interrupt_in_endpoint->bInterval);
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dev->read_urb_finished = 0;
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if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
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dev->read_urb_finished = 1;
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/* we ignore failure */
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/* end of fixup for first read */
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/* initialize out direction */
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dev->out_urb_finished = 1;
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retval = 0;
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exit_no_device:
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mutex_unlock(&adutux_mutex);
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exit_no_lock:
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return retval;
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}
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static void adu_release_internal(struct adu_device *dev)
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{
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/* decrement our usage count for the device */
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--dev->open_count;
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dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__,
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dev->open_count);
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if (dev->open_count <= 0) {
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adu_abort_transfers(dev);
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dev->open_count = 0;
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}
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}
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static int adu_release(struct inode *inode, struct file *file)
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{
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struct adu_device *dev;
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int retval = 0;
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if (file == NULL) {
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retval = -ENODEV;
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goto exit;
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}
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dev = file->private_data;
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if (dev == NULL) {
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retval = -ENODEV;
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goto exit;
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}
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mutex_lock(&adutux_mutex); /* not interruptible */
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if (dev->open_count <= 0) {
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dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__);
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retval = -ENODEV;
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goto unlock;
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}
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adu_release_internal(dev);
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if (dev->udev == NULL) {
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/* the device was unplugged before the file was released */
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if (!dev->open_count) /* ... and we're the last user */
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adu_delete(dev);
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}
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unlock:
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mutex_unlock(&adutux_mutex);
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exit:
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return retval;
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}
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static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
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loff_t *ppos)
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{
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struct adu_device *dev;
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size_t bytes_read = 0;
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size_t bytes_to_read = count;
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int i;
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int retval = 0;
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int timeout = 0;
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int should_submit = 0;
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unsigned long flags;
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DECLARE_WAITQUEUE(wait, current);
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dev = file->private_data;
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if (mutex_lock_interruptible(&dev->mtx))
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return -ERESTARTSYS;
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/* verify that the device wasn't unplugged */
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if (dev->udev == NULL) {
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retval = -ENODEV;
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pr_err("No device or device unplugged %d\n", retval);
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goto exit;
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}
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/* verify that some data was requested */
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if (count == 0) {
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dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n",
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__func__);
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goto exit;
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}
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timeout = COMMAND_TIMEOUT;
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dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__);
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while (bytes_to_read) {
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int data_in_secondary = dev->secondary_tail - dev->secondary_head;
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dev_dbg(&dev->udev->dev,
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"%s : while, data_in_secondary=%d, status=%d\n",
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__func__, data_in_secondary,
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dev->interrupt_in_urb->status);
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if (data_in_secondary) {
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/* drain secondary buffer */
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int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
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i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
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if (i) {
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retval = -EFAULT;
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goto exit;
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}
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dev->secondary_head += (amount - i);
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bytes_read += (amount - i);
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bytes_to_read -= (amount - i);
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} else {
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/* we check the primary buffer */
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spin_lock_irqsave (&dev->buflock, flags);
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if (dev->read_buffer_length) {
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/* we secure access to the primary */
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char *tmp;
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dev_dbg(&dev->udev->dev,
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"%s : swap, read_buffer_length = %d\n",
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__func__, dev->read_buffer_length);
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tmp = dev->read_buffer_secondary;
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dev->read_buffer_secondary = dev->read_buffer_primary;
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dev->read_buffer_primary = tmp;
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dev->secondary_head = 0;
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dev->secondary_tail = dev->read_buffer_length;
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dev->read_buffer_length = 0;
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spin_unlock_irqrestore(&dev->buflock, flags);
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/* we have a free buffer so use it */
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should_submit = 1;
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} else {
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/* even the primary was empty - we may need to do IO */
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if (!dev->read_urb_finished) {
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/* somebody is doing IO */
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spin_unlock_irqrestore(&dev->buflock, flags);
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dev_dbg(&dev->udev->dev,
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"%s : submitted already\n",
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__func__);
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} else {
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/* we must initiate input */
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dev_dbg(&dev->udev->dev,
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"%s : initiate input\n",
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__func__);
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dev->read_urb_finished = 0;
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spin_unlock_irqrestore(&dev->buflock, flags);
|
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|
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usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
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usb_rcvintpipe(dev->udev,
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dev->interrupt_in_endpoint->bEndpointAddress),
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dev->interrupt_in_buffer,
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usb_endpoint_maxp(dev->interrupt_in_endpoint),
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adu_interrupt_in_callback,
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dev,
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dev->interrupt_in_endpoint->bInterval);
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retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
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if (retval) {
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dev->read_urb_finished = 1;
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if (retval == -ENOMEM) {
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retval = bytes_read ? bytes_read : -ENOMEM;
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}
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dev_dbg(&dev->udev->dev,
|
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"%s : submit failed\n",
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__func__);
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goto exit;
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}
|
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}
|
|
|
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/* we wait for I/O to complete */
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&dev->read_wait, &wait);
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spin_lock_irqsave(&dev->buflock, flags);
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if (!dev->read_urb_finished) {
|
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spin_unlock_irqrestore(&dev->buflock, flags);
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timeout = schedule_timeout(COMMAND_TIMEOUT);
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} else {
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spin_unlock_irqrestore(&dev->buflock, flags);
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set_current_state(TASK_RUNNING);
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}
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remove_wait_queue(&dev->read_wait, &wait);
|
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|
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if (timeout <= 0) {
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dev_dbg(&dev->udev->dev,
|
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"%s : timeout\n", __func__);
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retval = bytes_read ? bytes_read : -ETIMEDOUT;
|
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goto exit;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
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dev_dbg(&dev->udev->dev,
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"%s : signal pending\n",
|
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__func__);
|
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retval = bytes_read ? bytes_read : -EINTR;
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goto exit;
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}
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}
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}
|
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}
|
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|
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retval = bytes_read;
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/* if the primary buffer is empty then use it */
|
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spin_lock_irqsave(&dev->buflock, flags);
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if (should_submit && dev->read_urb_finished) {
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dev->read_urb_finished = 0;
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spin_unlock_irqrestore(&dev->buflock, flags);
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usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
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usb_rcvintpipe(dev->udev,
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dev->interrupt_in_endpoint->bEndpointAddress),
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dev->interrupt_in_buffer,
|
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usb_endpoint_maxp(dev->interrupt_in_endpoint),
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adu_interrupt_in_callback,
|
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dev,
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dev->interrupt_in_endpoint->bInterval);
|
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if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
|
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dev->read_urb_finished = 1;
|
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/* we ignore failure */
|
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} else {
|
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spin_unlock_irqrestore(&dev->buflock, flags);
|
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}
|
|
|
|
exit:
|
|
/* unlock the device */
|
|
mutex_unlock(&dev->mtx);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t adu_write(struct file *file, const __user char *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
DECLARE_WAITQUEUE(waita, current);
|
|
struct adu_device *dev;
|
|
size_t bytes_written = 0;
|
|
size_t bytes_to_write;
|
|
size_t buffer_size;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
dev = file->private_data;
|
|
|
|
retval = mutex_lock_interruptible(&dev->mtx);
|
|
if (retval)
|
|
goto exit_nolock;
|
|
|
|
/* verify that the device wasn't unplugged */
|
|
if (dev->udev == NULL) {
|
|
retval = -ENODEV;
|
|
pr_err("No device or device unplugged %d\n", retval);
|
|
goto exit;
|
|
}
|
|
|
|
/* verify that we actually have some data to write */
|
|
if (count == 0) {
|
|
dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n",
|
|
__func__);
|
|
goto exit;
|
|
}
|
|
|
|
while (count > 0) {
|
|
add_wait_queue(&dev->write_wait, &waita);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
spin_lock_irqsave(&dev->buflock, flags);
|
|
if (!dev->out_urb_finished) {
|
|
spin_unlock_irqrestore(&dev->buflock, flags);
|
|
|
|
mutex_unlock(&dev->mtx);
|
|
if (signal_pending(current)) {
|
|
dev_dbg(&dev->udev->dev, "%s : interrupted\n",
|
|
__func__);
|
|
set_current_state(TASK_RUNNING);
|
|
retval = -EINTR;
|
|
goto exit_onqueue;
|
|
}
|
|
if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
|
|
dev_dbg(&dev->udev->dev,
|
|
"%s - command timed out.\n", __func__);
|
|
retval = -ETIMEDOUT;
|
|
goto exit_onqueue;
|
|
}
|
|
remove_wait_queue(&dev->write_wait, &waita);
|
|
retval = mutex_lock_interruptible(&dev->mtx);
|
|
if (retval) {
|
|
retval = bytes_written ? bytes_written : retval;
|
|
goto exit_nolock;
|
|
}
|
|
|
|
dev_dbg(&dev->udev->dev,
|
|
"%s : in progress, count = %zd\n",
|
|
__func__, count);
|
|
} else {
|
|
spin_unlock_irqrestore(&dev->buflock, flags);
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&dev->write_wait, &waita);
|
|
dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n",
|
|
__func__, count);
|
|
|
|
/* write the data into interrupt_out_buffer from userspace */
|
|
buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
|
|
bytes_to_write = count > buffer_size ? buffer_size : count;
|
|
dev_dbg(&dev->udev->dev,
|
|
"%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n",
|
|
__func__, buffer_size, count, bytes_to_write);
|
|
|
|
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
|
|
retval = -EFAULT;
|
|
goto exit;
|
|
}
|
|
|
|
/* send off the urb */
|
|
usb_fill_int_urb(
|
|
dev->interrupt_out_urb,
|
|
dev->udev,
|
|
usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
|
|
dev->interrupt_out_buffer,
|
|
bytes_to_write,
|
|
adu_interrupt_out_callback,
|
|
dev,
|
|
dev->interrupt_out_endpoint->bInterval);
|
|
dev->interrupt_out_urb->actual_length = bytes_to_write;
|
|
dev->out_urb_finished = 0;
|
|
retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
|
|
if (retval < 0) {
|
|
dev->out_urb_finished = 1;
|
|
dev_err(&dev->udev->dev, "Couldn't submit "
|
|
"interrupt_out_urb %d\n", retval);
|
|
goto exit;
|
|
}
|
|
|
|
buffer += bytes_to_write;
|
|
count -= bytes_to_write;
|
|
|
|
bytes_written += bytes_to_write;
|
|
}
|
|
}
|
|
mutex_unlock(&dev->mtx);
|
|
return bytes_written;
|
|
|
|
exit:
|
|
mutex_unlock(&dev->mtx);
|
|
exit_nolock:
|
|
return retval;
|
|
|
|
exit_onqueue:
|
|
remove_wait_queue(&dev->write_wait, &waita);
|
|
return retval;
|
|
}
|
|
|
|
/* file operations needed when we register this driver */
|
|
static const struct file_operations adu_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = adu_read,
|
|
.write = adu_write,
|
|
.open = adu_open,
|
|
.release = adu_release,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
/*
|
|
* usb class driver info in order to get a minor number from the usb core,
|
|
* and to have the device registered with devfs and the driver core
|
|
*/
|
|
static struct usb_class_driver adu_class = {
|
|
.name = "usb/adutux%d",
|
|
.fops = &adu_fops,
|
|
.minor_base = ADU_MINOR_BASE,
|
|
};
|
|
|
|
/**
|
|
* adu_probe
|
|
*
|
|
* Called by the usb core when a new device is connected that it thinks
|
|
* this driver might be interested in.
|
|
*/
|
|
static int adu_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(interface);
|
|
struct adu_device *dev = NULL;
|
|
struct usb_host_interface *iface_desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
int retval = -ENODEV;
|
|
int in_end_size;
|
|
int out_end_size;
|
|
int i;
|
|
|
|
if (udev == NULL) {
|
|
dev_err(&interface->dev, "udev is NULL.\n");
|
|
goto exit;
|
|
}
|
|
|
|
/* allocate memory for our device state and initialize it */
|
|
dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
|
|
if (!dev) {
|
|
retval = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
mutex_init(&dev->mtx);
|
|
spin_lock_init(&dev->buflock);
|
|
dev->udev = udev;
|
|
init_waitqueue_head(&dev->read_wait);
|
|
init_waitqueue_head(&dev->write_wait);
|
|
|
|
iface_desc = &interface->altsetting[0];
|
|
|
|
/* 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(&interface->dev, "interrupt in endpoint not found\n");
|
|
goto error;
|
|
}
|
|
if (dev->interrupt_out_endpoint == NULL) {
|
|
dev_err(&interface->dev, "interrupt out endpoint not found\n");
|
|
goto error;
|
|
}
|
|
|
|
in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
|
|
out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
|
|
|
|
dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
|
|
if (!dev->read_buffer_primary) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
/* debug code prime the buffer */
|
|
memset(dev->read_buffer_primary, 'a', in_end_size);
|
|
memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
|
|
memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
|
|
memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
|
|
|
|
dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
|
|
if (!dev->read_buffer_secondary) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
/* debug code prime the buffer */
|
|
memset(dev->read_buffer_secondary, 'e', in_end_size);
|
|
memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
|
|
memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
|
|
memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
|
|
|
|
dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
|
|
if (!dev->interrupt_in_buffer)
|
|
goto error;
|
|
|
|
/* debug code prime the buffer */
|
|
memset(dev->interrupt_in_buffer, 'i', in_end_size);
|
|
|
|
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!dev->interrupt_in_urb)
|
|
goto error;
|
|
dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
|
|
if (!dev->interrupt_out_buffer)
|
|
goto error;
|
|
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!dev->interrupt_out_urb)
|
|
goto error;
|
|
|
|
if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
|
|
sizeof(dev->serial_number))) {
|
|
dev_err(&interface->dev, "Could not retrieve serial number\n");
|
|
goto error;
|
|
}
|
|
dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number);
|
|
|
|
/* we can register the device now, as it is ready */
|
|
usb_set_intfdata(interface, dev);
|
|
|
|
retval = usb_register_dev(interface, &adu_class);
|
|
|
|
if (retval) {
|
|
/* something prevented us from registering this driver */
|
|
dev_err(&interface->dev, "Not able to get a minor for this device.\n");
|
|
usb_set_intfdata(interface, NULL);
|
|
goto error;
|
|
}
|
|
|
|
dev->minor = interface->minor;
|
|
|
|
/* let the user know what node this device is now attached to */
|
|
dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
|
|
le16_to_cpu(udev->descriptor.idProduct), dev->serial_number,
|
|
(dev->minor - ADU_MINOR_BASE));
|
|
exit:
|
|
return retval;
|
|
|
|
error:
|
|
adu_delete(dev);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* adu_disconnect
|
|
*
|
|
* Called by the usb core when the device is removed from the system.
|
|
*/
|
|
static void adu_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct adu_device *dev;
|
|
int minor;
|
|
|
|
dev = usb_get_intfdata(interface);
|
|
|
|
mutex_lock(&dev->mtx); /* not interruptible */
|
|
dev->udev = NULL; /* poison */
|
|
minor = dev->minor;
|
|
usb_deregister_dev(interface, &adu_class);
|
|
mutex_unlock(&dev->mtx);
|
|
|
|
mutex_lock(&adutux_mutex);
|
|
usb_set_intfdata(interface, NULL);
|
|
|
|
/* if the device is not opened, then we clean up right now */
|
|
if (!dev->open_count)
|
|
adu_delete(dev);
|
|
|
|
mutex_unlock(&adutux_mutex);
|
|
}
|
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */
|
|
static struct usb_driver adu_driver = {
|
|
.name = "adutux",
|
|
.probe = adu_probe,
|
|
.disconnect = adu_disconnect,
|
|
.id_table = device_table,
|
|
};
|
|
|
|
module_usb_driver(adu_driver);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|