[PATCH 12/15] staging/lirc: add lirc_streamzap driver

From: Jarod Wilson <jarod@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org, linux-input@vger.kernel.org
Subject: [PATCH 12/15] staging/lirc: add lirc_streamzap driver
Date: Mon, 26 Jul 2010 19:32:49 -0400	[thread overview]
Message-ID: <20100726233249.GM21225@redhat.com> (raw)
In-Reply-To: <20100726232546.GA21225@redhat.com>

Signed-off-by: Jarod Wilson <jarod@redhat.com>
---
 drivers/staging/lirc/lirc_streamzap.c |  821 +++++++++++++++++++++++++++++++++
 1 files changed, 821 insertions(+), 0 deletions(-)
 create mode 100644 drivers/staging/lirc/lirc_streamzap.c

diff --git a/drivers/staging/lirc/lirc_streamzap.c b/drivers/staging/lirc/lirc_streamzap.c
new file mode 100644
index 0000000..5b46ac4
--- /dev/null
+++ b/drivers/staging/lirc/lirc_streamzap.c
@@ -0,0 +1,821 @@
+/*
+ * Streamzap Remote Control driver
+ *
+ * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
+ *
+ * This driver was based on the work of Greg Wickham and Adrian
+ * Dewhurst. It was substantially rewritten to support correct signal
+ * gaps and now maintains a delay buffer, which is used to present
+ * consistent timing behaviour to user space applications. Without the
+ * delay buffer an ugly hack would be required in lircd, which can
+ * cause sluggish signal decoding in certain situations.
+ *
+ * This driver is based on the USB skeleton driver packaged with the
+ * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/smp_lock.h>
+#include <linux/completion.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+
+#define DRIVER_VERSION	"1.28"
+#define DRIVER_NAME	"lirc_streamzap"
+#define DRIVER_DESC	"Streamzap Remote Control driver"
+
+static int debug;
+
+#define USB_STREAMZAP_VENDOR_ID		0x0e9c
+#define USB_STREAMZAP_PRODUCT_ID	0x0000
+
+/* Use our own dbg macro */
+#define dprintk(fmt, args...)					\
+	do {							\
+		if (debug)					\
+			printk(KERN_DEBUG DRIVER_NAME "[%d]: "	\
+			       fmt "\n", ## args);		\
+	} while (0)
+
+/* table of devices that work with this driver */
+static struct usb_device_id streamzap_table[] = {
+	/* Streamzap Remote Control */
+	{ USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
+	/* Terminating entry */
+	{ }
+};
+
+MODULE_DEVICE_TABLE(usb, streamzap_table);
+
+#define STREAMZAP_PULSE_MASK 0xf0
+#define STREAMZAP_SPACE_MASK 0x0f
+#define STREAMZAP_TIMEOUT    0xff
+#define STREAMZAP_RESOLUTION 256
+
+/* number of samples buffered */
+#define STREAMZAP_BUF_LEN 128
+
+enum StreamzapDecoderState {
+	PulseSpace,
+	FullPulse,
+	FullSpace,
+	IgnorePulse
+};
+
+/* Structure to hold all of our device specific stuff
+ *
+ * some remarks regarding locking:
+ * theoretically this struct can be accessed from three threads:
+ *
+ * - from lirc_dev through set_use_inc/set_use_dec
+ *
+ * - from the USB layer throuh probe/disconnect/irq
+ *
+ *   Careful placement of lirc_register_driver/lirc_unregister_driver
+ *   calls will prevent conflicts. lirc_dev makes sure that
+ *   set_use_inc/set_use_dec are not being executed and will not be
+ *   called after lirc_unregister_driver returns.
+ *
+ * - by the timer callback
+ *
+ *   The timer is only running when the device is connected and the
+ *   LIRC device is open. Making sure the timer is deleted by
+ *   set_use_dec will make conflicts impossible.
+ */
+struct usb_streamzap {
+
+	/* usb */
+	/* save off the usb device pointer */
+	struct usb_device	*udev;
+	/* the interface for this device */
+	struct usb_interface	*interface;
+
+	/* buffer & dma */
+	unsigned char		*buf_in;
+	dma_addr_t		dma_in;
+	unsigned int		buf_in_len;
+
+	struct usb_endpoint_descriptor *endpoint;
+
+	/* IRQ */
+	struct urb		*urb_in;
+
+	/* lirc */
+	struct lirc_driver	*driver;
+	struct lirc_buffer	*delay_buf;
+
+	/* timer used to support delay buffering */
+	struct timer_list	delay_timer;
+	int			timer_running;
+	spinlock_t		timer_lock;
+
+	/* tracks whether we are currently receiving some signal */
+	int			idle;
+	/* sum of signal lengths received since signal start */
+	unsigned long		sum;
+	/* start time of signal; necessary for gap tracking */
+	struct timeval		signal_last;
+	struct timeval		signal_start;
+	enum StreamzapDecoderState decoder_state;
+	struct timer_list	flush_timer;
+	int			flush;
+	int			in_use;
+	int			timeout_enabled;
+};
+
+
+/* local function prototypes */
+static int streamzap_probe(struct usb_interface *interface,
+			   const struct usb_device_id *id);
+static void streamzap_disconnect(struct usb_interface *interface);
+static void usb_streamzap_irq(struct urb *urb);
+static int streamzap_use_inc(void *data);
+static void streamzap_use_dec(void *data);
+static long streamzap_ioctl(struct file *filep, unsigned int cmd,
+			    unsigned long arg);
+static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
+static int streamzap_resume(struct usb_interface *intf);
+
+/* usb specific object needed to register this driver with the usb subsystem */
+
+static struct usb_driver streamzap_driver = {
+	.name =		DRIVER_NAME,
+	.probe =	streamzap_probe,
+	.disconnect =	streamzap_disconnect,
+	.suspend =	streamzap_suspend,
+	.resume =	streamzap_resume,
+	.id_table =	streamzap_table,
+};
+
+static void stop_timer(struct usb_streamzap *sz)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&sz->timer_lock, flags);
+	if (sz->timer_running) {
+		sz->timer_running = 0;
+		spin_unlock_irqrestore(&sz->timer_lock, flags);
+		del_timer_sync(&sz->delay_timer);
+	} else {
+		spin_unlock_irqrestore(&sz->timer_lock, flags);
+	}
+}
+
+static void flush_timeout(unsigned long arg)
+{
+	struct usb_streamzap *sz = (struct usb_streamzap *) arg;
+
+	/* finally start accepting data */
+	sz->flush = 0;
+}
+static void delay_timeout(unsigned long arg)
+{
+	unsigned long flags;
+	/* deliver data every 10 ms */
+	static unsigned long timer_inc =
+		(10000/(1000000/HZ)) == 0 ? 1 : (10000/(1000000/HZ));
+	struct usb_streamzap *sz = (struct usb_streamzap *) arg;
+	int data;
+
+	spin_lock_irqsave(&sz->timer_lock, flags);
+
+	if (!lirc_buffer_empty(sz->delay_buf) &&
+	    !lirc_buffer_full(sz->driver->rbuf)) {
+		lirc_buffer_read(sz->delay_buf, (unsigned char *) &data);
+		lirc_buffer_write(sz->driver->rbuf, (unsigned char *) &data);
+	}
+	if (!lirc_buffer_empty(sz->delay_buf)) {
+		while (lirc_buffer_available(sz->delay_buf) <
+		       STREAMZAP_BUF_LEN / 2 &&
+		       !lirc_buffer_full(sz->driver->rbuf)) {
+			lirc_buffer_read(sz->delay_buf,
+					   (unsigned char *) &data);
+			lirc_buffer_write(sz->driver->rbuf,
+					    (unsigned char *) &data);
+		}
+		if (sz->timer_running) {
+			sz->delay_timer.expires = jiffies + timer_inc;
+			add_timer(&sz->delay_timer);
+		}
+	} else {
+		sz->timer_running = 0;
+	}
+
+	if (!lirc_buffer_empty(sz->driver->rbuf))
+		wake_up(&sz->driver->rbuf->wait_poll);
+
+	spin_unlock_irqrestore(&sz->timer_lock, flags);
+}
+
+static void flush_delay_buffer(struct usb_streamzap *sz)
+{
+	int data;
+	int empty = 1;
+
+	while (!lirc_buffer_empty(sz->delay_buf)) {
+		empty = 0;
+		lirc_buffer_read(sz->delay_buf, (unsigned char *) &data);
+		if (!lirc_buffer_full(sz->driver->rbuf)) {
+			lirc_buffer_write(sz->driver->rbuf,
+					    (unsigned char *) &data);
+		} else {
+			dprintk("buffer overflow", sz->driver->minor);
+		}
+	}
+	if (!empty)
+		wake_up(&sz->driver->rbuf->wait_poll);
+}
+
+static void push(struct usb_streamzap *sz, unsigned char *data)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&sz->timer_lock, flags);
+	if (lirc_buffer_full(sz->delay_buf)) {
+		int read_data;
+
+		lirc_buffer_read(sz->delay_buf,
+				   (unsigned char *) &read_data);
+		if (!lirc_buffer_full(sz->driver->rbuf)) {
+			lirc_buffer_write(sz->driver->rbuf,
+					    (unsigned char *) &read_data);
+		} else {
+			dprintk("buffer overflow", sz->driver->minor);
+		}
+	}
+
+	lirc_buffer_write(sz->delay_buf, data);
+
+	if (!sz->timer_running) {
+		sz->delay_timer.expires = jiffies + HZ/10;
+		add_timer(&sz->delay_timer);
+		sz->timer_running = 1;
+	}
+
+	spin_unlock_irqrestore(&sz->timer_lock, flags);
+}
+
+static void push_full_pulse(struct usb_streamzap *sz,
+			    unsigned char value)
+{
+	int pulse;
+
+	if (sz->idle) {
+		long deltv;
+		int tmp;
+
+		sz->signal_last = sz->signal_start;
+		do_gettimeofday(&sz->signal_start);
+
+		deltv = sz->signal_start.tv_sec-sz->signal_last.tv_sec;
+		if (deltv > 15) {
+			/* really long time */
+			tmp = LIRC_SPACE(LIRC_VALUE_MASK);
+		} else {
+			tmp = (int) (deltv*1000000+
+					sz->signal_start.tv_usec -
+					sz->signal_last.tv_usec);
+			tmp -= sz->sum;
+			tmp = LIRC_SPACE(tmp);
+		}
+		dprintk("ls %u", sz->driver->minor, tmp);
+		push(sz, (char *)&tmp);
+
+		sz->idle = 0;
+		sz->sum = 0;
+	}
+
+	pulse = ((int) value) * STREAMZAP_RESOLUTION;
+	pulse += STREAMZAP_RESOLUTION / 2;
+	sz->sum += pulse;
+	pulse = LIRC_PULSE(pulse);
+
+	dprintk("p %u", sz->driver->minor, pulse & PULSE_MASK);
+	push(sz, (char *)&pulse);
+}
+
+static void push_half_pulse(struct usb_streamzap *sz,
+			    unsigned char value)
+{
+	push_full_pulse(sz, (value & STREAMZAP_PULSE_MASK)>>4);
+}
+
+static void push_full_space(struct usb_streamzap *sz,
+			    unsigned char value)
+{
+	int space;
+
+	space = ((int) value)*STREAMZAP_RESOLUTION;
+	space += STREAMZAP_RESOLUTION/2;
+	sz->sum += space;
+	space = LIRC_SPACE(space);
+	dprintk("s %u", sz->driver->minor, space);
+	push(sz, (char *)&space);
+}
+
+static void push_half_space(struct usb_streamzap *sz,
+			    unsigned char value)
+{
+	push_full_space(sz, value & STREAMZAP_SPACE_MASK);
+}
+
+/**
+ * usb_streamzap_irq - IRQ handler
+ *
+ * This procedure is invoked on reception of data from
+ * the usb remote.
+ */
+static void usb_streamzap_irq(struct urb *urb)
+{
+	struct usb_streamzap *sz;
+	int		len;
+	unsigned int	i = 0;
+
+	if (!urb)
+		return;
+
+	sz = urb->context;
+	len = urb->actual_length;
+
+	switch (urb->status) {
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/*
+		 * this urb is terminated, clean up.
+		 * sz might already be invalid at this point
+		 */
+		dprintk("urb status: %d", -1, urb->status);
+		return;
+	default:
+		break;
+	}
+
+	dprintk("received %d", sz->driver->minor, urb->actual_length);
+	if (!sz->flush) {
+		for (i = 0; i < urb->actual_length; i++) {
+			dprintk("%d: %x", sz->driver->minor,
+				i, (unsigned char) sz->buf_in[i]);
+			switch (sz->decoder_state) {
+			case PulseSpace:
+				if ((sz->buf_in[i]&STREAMZAP_PULSE_MASK) ==
+				    STREAMZAP_PULSE_MASK) {
+					sz->decoder_state = FullPulse;
+					continue;
+				} else if ((sz->buf_in[i]&STREAMZAP_SPACE_MASK)
+					   == STREAMZAP_SPACE_MASK) {
+					push_half_pulse(sz, sz->buf_in[i]);
+					sz->decoder_state = FullSpace;
+					continue;
+				} else {
+					push_half_pulse(sz, sz->buf_in[i]);
+					push_half_space(sz, sz->buf_in[i]);
+				}
+				break;
+			case FullPulse:
+				push_full_pulse(sz, sz->buf_in[i]);
+				sz->decoder_state = IgnorePulse;
+				break;
+			case FullSpace:
+				if (sz->buf_in[i] == STREAMZAP_TIMEOUT) {
+					sz->idle = 1;
+					stop_timer(sz);
+					if (sz->timeout_enabled) {
+						int timeout =
+							LIRC_TIMEOUT
+							(STREAMZAP_TIMEOUT *
+							STREAMZAP_RESOLUTION);
+						push(sz, (char *)&timeout);
+					}
+					flush_delay_buffer(sz);
+				} else
+					push_full_space(sz, sz->buf_in[i]);
+				sz->decoder_state = PulseSpace;
+				break;
+			case IgnorePulse:
+				if ((sz->buf_in[i]&STREAMZAP_SPACE_MASK) ==
+				    STREAMZAP_SPACE_MASK) {
+					sz->decoder_state = FullSpace;
+					continue;
+				}
+				push_half_space(sz, sz->buf_in[i]);
+				sz->decoder_state = PulseSpace;
+				break;
+			}
+		}
+	}
+
+	usb_submit_urb(urb, GFP_ATOMIC);
+
+	return;
+}
+
+static struct file_operations streamzap_fops = {
+	.owner		= THIS_MODULE,
+	.unlocked_ioctl	= streamzap_ioctl,
+	.read		= lirc_dev_fop_read,
+	.write		= lirc_dev_fop_write,
+	.poll		= lirc_dev_fop_poll,
+	.open		= lirc_dev_fop_open,
+	.release	= lirc_dev_fop_close,
+};
+
+
+/**
+ *	streamzap_probe
+ *
+ *	Called by usb-core to associated with a candidate device
+ *	On any failure the return value is the ERROR
+ *	On success return 0
+ */
+static int streamzap_probe(struct usb_interface *interface,
+			   const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct usb_host_interface *iface_host;
+	struct usb_streamzap *sz;
+	struct lirc_driver *driver;
+	struct lirc_buffer *lirc_buf;
+	struct lirc_buffer *delay_buf;
+	char buf[63], name[128] = "";
+	int retval = -ENOMEM;
+	int minor = 0;
+
+	/* Allocate space for device driver specific data */
+	sz = kzalloc(sizeof(struct usb_streamzap), GFP_KERNEL);
+	if (sz == NULL)
+		return -ENOMEM;
+
+	sz->udev = udev;
+	sz->interface = interface;
+
+	/* Check to ensure endpoint information matches requirements */
+	iface_host = interface->cur_altsetting;
+
+	if (iface_host->desc.bNumEndpoints != 1) {
+		err("%s: Unexpected desc.bNumEndpoints (%d)", __func__,
+		    iface_host->desc.bNumEndpoints);
+		retval = -ENODEV;
+		goto free_sz;
+	}
+
+	sz->endpoint = &(iface_host->endpoint[0].desc);
+	if ((sz->endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+	    != USB_DIR_IN) {
+		err("%s: endpoint doesn't match input device 02%02x",
+		    __func__, sz->endpoint->bEndpointAddress);
+		retval = -ENODEV;
+		goto free_sz;
+	}
+
+	if ((sz->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+	    != USB_ENDPOINT_XFER_INT) {
+		err("%s: endpoint attributes don't match xfer 02%02x",
+		    __func__, sz->endpoint->bmAttributes);
+		retval = -ENODEV;
+		goto free_sz;
+	}
+
+	if (sz->endpoint->wMaxPacketSize == 0) {
+		err("%s: endpoint message size==0? ", __func__);
+		retval = -ENODEV;
+		goto free_sz;
+	}
+
+	/* Allocate the USB buffer and IRQ URB */
+
+	sz->buf_in_len = sz->endpoint->wMaxPacketSize;
+	sz->buf_in = usb_alloc_coherent(sz->udev, sz->buf_in_len,
+				      GFP_ATOMIC, &sz->dma_in);
+	if (sz->buf_in == NULL)
+		goto free_sz;
+
+	sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
+	if (sz->urb_in == NULL)
+		goto free_sz;
+
+	/* Connect this device to the LIRC sub-system */
+	driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
+	if (!driver)
+		goto free_sz;
+
+	lirc_buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+	if (!lirc_buf)
+		goto free_driver;
+	if (lirc_buffer_init(lirc_buf, sizeof(int), STREAMZAP_BUF_LEN))
+		goto kfree_lirc_buf;
+
+	delay_buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+	if (!delay_buf)
+		goto free_lirc_buf;
+	if (lirc_buffer_init(delay_buf, sizeof(int), STREAMZAP_BUF_LEN))
+		goto kfree_delay_buf;
+
+	sz->driver = driver;
+	strcpy(sz->driver->name, DRIVER_NAME);
+	sz->driver->minor = -1;
+	sz->driver->sample_rate = 0;
+	sz->driver->code_length = sizeof(int) * 8;
+	sz->driver->features = LIRC_CAN_REC_MODE2 |
+		LIRC_CAN_GET_REC_RESOLUTION |
+		LIRC_CAN_SET_REC_TIMEOUT;
+	sz->driver->data = sz;
+	sz->driver->min_timeout = STREAMZAP_TIMEOUT * STREAMZAP_RESOLUTION;
+	sz->driver->max_timeout = STREAMZAP_TIMEOUT * STREAMZAP_RESOLUTION;
+	sz->driver->rbuf = lirc_buf;
+	sz->delay_buf = delay_buf;
+	sz->driver->set_use_inc = &streamzap_use_inc;
+	sz->driver->set_use_dec = &streamzap_use_dec;
+	sz->driver->fops = &streamzap_fops;
+	sz->driver->dev = &interface->dev;
+	sz->driver->owner = THIS_MODULE;
+
+	sz->idle = 1;
+	sz->decoder_state = PulseSpace;
+	init_timer(&sz->delay_timer);
+	sz->delay_timer.function = delay_timeout;
+	sz->delay_timer.data = (unsigned long) sz;
+	sz->timer_running = 0;
+	spin_lock_init(&sz->timer_lock);
+
+	init_timer(&sz->flush_timer);
+	sz->flush_timer.function = flush_timeout;
+	sz->flush_timer.data = (unsigned long) sz;
+	/* Complete final initialisations */
+
+	usb_fill_int_urb(sz->urb_in, udev,
+		usb_rcvintpipe(udev, sz->endpoint->bEndpointAddress),
+		sz->buf_in, sz->buf_in_len, usb_streamzap_irq, sz,
+		sz->endpoint->bInterval);
+	sz->urb_in->transfer_dma = sz->dma_in;
+	sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	if (udev->descriptor.iManufacturer
+	    && usb_string(udev, udev->descriptor.iManufacturer,
+			  buf, sizeof(buf)) > 0)
+		strlcpy(name, buf, sizeof(name));
+
+	if (udev->descriptor.iProduct
+	    && usb_string(udev, udev->descriptor.iProduct,
+			  buf, sizeof(buf)) > 0)
+		snprintf(name + strlen(name), sizeof(name) - strlen(name),
+			 " %s", buf);
+
+	minor = lirc_register_driver(driver);
+
+	if (minor < 0)
+		goto free_delay_buf;
+
+	sz->driver->minor = minor;
+
+	usb_set_intfdata(interface, sz);
+
+	printk(KERN_INFO DRIVER_NAME "[%d]: %s on usb%d:%d attached\n",
+	       sz->driver->minor, name,
+	       udev->bus->busnum, sz->udev->devnum);
+
+	return 0;
+
+free_delay_buf:
+	lirc_buffer_free(sz->delay_buf);
+kfree_delay_buf:
+	kfree(delay_buf);
+free_lirc_buf:
+	lirc_buffer_free(sz->driver->rbuf);
+kfree_lirc_buf:
+	kfree(lirc_buf);
+free_driver:
+	kfree(driver);
+free_sz:
+	if (retval == -ENOMEM)
+		err("Out of memory");
+
+	if (sz) {
+		usb_free_urb(sz->urb_in);
+		usb_free_coherent(udev, sz->buf_in_len, sz->buf_in, sz->dma_in);
+		kfree(sz);
+	}
+
+	return retval;
+}
+
+static int streamzap_use_inc(void *data)
+{
+	struct usb_streamzap *sz = data;
+
+	if (!sz) {
+		dprintk("%s called with no context", -1, __func__);
+		return -EINVAL;
+	}
+	dprintk("set use inc", sz->driver->minor);
+
+	lirc_buffer_clear(sz->driver->rbuf);
+	lirc_buffer_clear(sz->delay_buf);
+
+	sz->flush_timer.expires = jiffies + HZ;
+	sz->flush = 1;
+	add_timer(&sz->flush_timer);
+
+	sz->urb_in->dev = sz->udev;
+	if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
+		dprintk("open result = -EIO error submitting urb",
+			sz->driver->minor);
+		return -EIO;
+	}
+	sz->in_use++;
+
+	return 0;
+}
+
+static void streamzap_use_dec(void *data)
+{
+	struct usb_streamzap *sz = data;
+
+	if (!sz) {
+		dprintk("%s called with no context", -1, __func__);
+		return;
+	}
+	dprintk("set use dec", sz->driver->minor);
+
+	if (sz->flush) {
+		sz->flush = 0;
+		del_timer_sync(&sz->flush_timer);
+	}
+
+	usb_kill_urb(sz->urb_in);
+
+	stop_timer(sz);
+
+	sz->in_use--;
+}
+
+static long streamzap_ioctl(struct file *filep, unsigned int cmd,
+			    unsigned long arg)
+{
+	int result = 0;
+	int val;
+	struct usb_streamzap *sz = lirc_get_pdata(filep);
+
+	switch (cmd) {
+	case LIRC_GET_REC_RESOLUTION:
+		result = put_user(STREAMZAP_RESOLUTION, (unsigned int *) arg);
+		break;
+	case LIRC_SET_REC_TIMEOUT:
+		result = get_user(val, (int *)arg);
+		if (result == 0) {
+			if (val == STREAMZAP_TIMEOUT * STREAMZAP_RESOLUTION)
+				sz->timeout_enabled = 1;
+			else if (val == 0)
+				sz->timeout_enabled = 0;
+			else
+				result = -EINVAL;
+		}
+		break;
+	default:
+		return lirc_dev_fop_ioctl(filep, cmd, arg);
+	}
+	return result;
+}
+
+/**
+ * streamzap_disconnect
+ *
+ * Called by the usb core when the device is removed from the system.
+ *
+ * This routine guarantees that the driver will not submit any more urbs
+ * by clearing dev->udev.  It is also supposed to terminate any currently
+ * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
+ * does not provide any way to do this.
+ */
+static void streamzap_disconnect(struct usb_interface *interface)
+{
+	struct usb_streamzap *sz;
+	int errnum;
+	int minor;
+
+	sz = usb_get_intfdata(interface);
+
+	/* unregister from the LIRC sub-system */
+
+	errnum = lirc_unregister_driver(sz->driver->minor);
+	if (errnum != 0)
+		dprintk("error in lirc_unregister: (returned %d)",
+			sz->driver->minor, errnum);
+
+	lirc_buffer_free(sz->delay_buf);
+	lirc_buffer_free(sz->driver->rbuf);
+
+	/* unregister from the USB sub-system */
+
+	usb_free_urb(sz->urb_in);
+
+	usb_free_coherent(sz->udev, sz->buf_in_len, sz->buf_in, sz->dma_in);
+
+	minor = sz->driver->minor;
+	kfree(sz->driver->rbuf);
+	kfree(sz->driver);
+	kfree(sz->delay_buf);
+	kfree(sz);
+
+	printk(KERN_INFO DRIVER_NAME "[%d]: disconnected\n", minor);
+}
+
+static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct usb_streamzap *sz = usb_get_intfdata(intf);
+
+	printk(KERN_INFO DRIVER_NAME "[%d]: suspend\n", sz->driver->minor);
+	if (sz->in_use) {
+		if (sz->flush) {
+			sz->flush = 0;
+			del_timer_sync(&sz->flush_timer);
+		}
+
+		stop_timer(sz);
+
+		usb_kill_urb(sz->urb_in);
+	}
+	return 0;
+}
+
+static int streamzap_resume(struct usb_interface *intf)
+{
+	struct usb_streamzap *sz = usb_get_intfdata(intf);
+
+	lirc_buffer_clear(sz->driver->rbuf);
+	lirc_buffer_clear(sz->delay_buf);
+
+	if (sz->in_use) {
+		sz->flush_timer.expires = jiffies + HZ;
+		sz->flush = 1;
+		add_timer(&sz->flush_timer);
+
+		sz->urb_in->dev = sz->udev;
+		if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
+			dprintk("open result = -EIO error submitting urb",
+				sz->driver->minor);
+			return -EIO;
+		}
+	}
+	return 0;
+}
+
+/**
+ *	usb_streamzap_init
+ */
+static int __init usb_streamzap_init(void)
+{
+	int result;
+
+	/* register this driver with the USB subsystem */
+	result = usb_register(&streamzap_driver);
+
+	if (result) {
+		err("usb_register failed. Error number %d",
+		    result);
+		return result;
+	}
+
+	printk(KERN_INFO DRIVER_NAME " " DRIVER_VERSION " registered\n");
+	return 0;
+}
+
+/**
+ *	usb_streamzap_exit
+ */
+static void __exit usb_streamzap_exit(void)
+{
+	usb_deregister(&streamzap_driver);
+}
+
+
+module_init(usb_streamzap_init);
+module_exit(usb_streamzap_exit);
+
+MODULE_AUTHOR("Christoph Bartelmus, Greg Wickham, Adrian Dewhurst");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debugging messages");
-- 
1.7.1.1

-- 
Jarod Wilson
jarod@redhat.com

