satip-axe/kernel/drivers/char/lirc/lirc_mceusb.c
2015-03-26 17:24:57 +01:00

868 lines
22 KiB
C

/*
* USB Microsoft IR Transceiver driver - 0.2
*
* Copyright (c) 2003-2004 Dan Conti (dconti@acm.wwu.edu)
*
* The Microsoft IR Transceiver is a neat little IR receiver with two
* emitters on it designed for Windows Media Center. This driver might
* work for all media center remotes, but I have only tested it with
* the philips model. The first revision of this driver only supports
* the receive function - the transmit function will be much more
* tricky due to the nature of the hardware. Microsoft chose to build
* this device inexpensively, therefore making it extra dumb.
* There is no interrupt endpoint on this device; all usb traffic
* happens over two bulk endpoints. As a result of this, poll() for
* this device is an actual hardware poll (instead of a receive queue
* check) and is rather expensive.
*
* All trademarks property of their respective owners.
*
* TODO
* - Fix up minor number, registration of major/minor with usb subsystem
*
*/
#include <linux/autoconf.h>
#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/usb.h>
#ifdef KERNEL_2_5
#include <linux/completion.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
#include <asm/uaccess.h>
#else
#include <linux/uaccess.h>
#endif
#else
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/signal.h>
#endif
#ifdef CONFIG_USB_DEBUG
static int debug = 1;
#else
static int debug;
#endif
#include "kcompat.h"
#include <linux/lirc.h>
#include "lirc_dev.h"
/* Use our own dbg macro */
#define dprintk(fmt, args...) \
do { \
if (debug) \
printk(KERN_DEBUG __FILE__ ": " \
fmt "\n", ## args); \
} while (0)
/* Version Information */
#define DRIVER_VERSION "v0.2"
#define DRIVER_AUTHOR "Dan Conti, dconti@acm.wwu.edu"
#define DRIVER_DESC "USB Microsoft IR Transceiver Driver"
#define DRIVER_NAME "lirc_mceusb"
/* Define these values to match your device */
#define USB_MCEUSB_VENDOR_ID 0x045e
#define USB_MCEUSB_PRODUCT_ID 0x006d
/* table of devices that work with this driver */
static struct usb_device_id mceusb_table[] = {
/* USB Microsoft IR Transceiver */
{ USB_DEVICE(USB_MCEUSB_VENDOR_ID, USB_MCEUSB_PRODUCT_ID) },
/* Terminating entry */
{ }
};
/* we can have up to this number of device plugged in at once */
#define MAX_DEVICES 16
/* Structure to hold all of our device specific stuff */
struct mceusb_device {
struct usb_device *udev; /* save off the usb device pointer */
struct usb_interface *interface; /* the interface for this device */
unsigned char minor; /* the starting minor number for this device */
unsigned char num_ports; /* the number of ports this device has */
char num_interrupt_in; /* number of interrupt in endpoints */
char num_bulk_in; /* number of bulk in endpoints */
char num_bulk_out; /* number of bulk out endpoints */
unsigned char *bulk_in_buffer; /* the buffer to receive data */
int bulk_in_size; /* the size of the receive buffer */
__u8 bulk_in_endpointAddr; /* the address of bulk in endpoint */
unsigned char *bulk_out_buffer; /* the buffer to send data */
int bulk_out_size; /* the size of the send buffer */
struct urb *write_urb; /* the urb used to send data */
__u8 bulk_out_endpointAddr; /* the address of bulk out endpoint */
wait_queue_head_t wait_q; /* for timeouts */
struct mutex lock; /* locks this structure */
struct lirc_driver *driver;
lirc_t lircdata[256]; /* place to store data until lirc processes it */
int lircidx; /* current index */
int lirccnt; /* remaining values */
int usb_valid_bytes_in_bulk_buffer; /* leftover data from prior read */
int mce_bytes_left_in_packet; /* for packets split across reads */
/* Value to hold the last received space; 0 if last value
* received was a pulse */
int last_space;
#ifdef KERNEL_2_5
dma_addr_t dma_in;
dma_addr_t dma_out;
#endif
};
#define MCE_TIME_UNIT 50
/* driver api */
#ifdef KERNEL_2_5
static int mceusb_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void mceusb_disconnect(struct usb_interface *interface);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
static void mceusb_write_bulk_callback(struct urb *urb, struct pt_regs *regs);
#else
static void mceusb_write_bulk_callback(struct urb *urb);
#endif
#else
static void *mceusb_probe(struct usb_device *dev, unsigned int ifnum,
const struct usb_device_id *id);
static void mceusb_disconnect(struct usb_device *dev, void *ptr);
static void mceusb_write_bulk_callback(struct urb *urb);
#endif
/* read data from the usb bus; convert to mode2 */
static int msir_fetch_more_data(struct mceusb_device *dev, int dont_block);
/* helper functions */
static void msir_cleanup(struct mceusb_device *dev);
static void set_use_dec(void *data);
static int set_use_inc(void *data);
/* array of pointers to our devices that are currently connected */
static struct mceusb_device *minor_table[MAX_DEVICES];
/* lock to protect the minor_table structure */
static DEFINE_MUTEX(minor_table_mutex);
static void mceusb_setup(struct usb_device *udev);
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver mceusb_driver = {
LIRC_THIS_MODULE(.owner = THIS_MODULE)
.name = DRIVER_NAME,
.probe = mceusb_probe,
.disconnect = mceusb_disconnect,
.id_table = mceusb_table,
};
static void mceusb_delete(struct mceusb_device *dev)
{
dprintk("%s", __func__);
minor_table[dev->minor] = NULL;
#ifdef KERNEL_2_5
usb_buffer_free(dev->udev, dev->bulk_in_size,
dev->bulk_in_buffer, dev->dma_in);
usb_buffer_free(dev->udev, dev->bulk_out_size,
dev->bulk_out_buffer, dev->dma_out);
#else
if (dev->bulk_in_buffer != NULL)
kfree(dev->bulk_in_buffer);
if (dev->bulk_out_buffer != NULL)
kfree(dev->bulk_out_buffer);
#endif
if (dev->write_urb != NULL)
usb_free_urb(dev->write_urb);
kfree(dev);
}
static void mceusb_setup(struct usb_device *udev)
{
char data[8];
int res;
memset(data, 0, 8);
/* Get Status */
res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN,
0, 0, data, 2, HZ * 3);
/* res = usb_get_status( udev, 0, 0, data ); */
dprintk("%s - res = %d status = 0x%x 0x%x", __func__,
res, data[0], data[1]);
/*
* This is a strange one. They issue a set address to the device
* on the receive control pipe and expect a certain value pair back
*/
memset(data, 0, 8);
res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
5, USB_TYPE_VENDOR, 0, 0,
data, 2, HZ * 3);
dprintk("%s - res = %d, devnum = %d", __func__, res, udev->devnum);
dprintk("%s - data[0] = %d, data[1] = %d", __func__,
data[0], data[1]);
/* set feature */
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_SET_FEATURE, USB_TYPE_VENDOR,
0xc04e, 0x0000, NULL, 0, HZ * 3);
dprintk("%s - res = %d", __func__, res);
/*
* These two are sent by the windows driver, but stall for
* me. I don't have an analyzer on the Linux side so I can't
* see what is actually different and why the device takes
* issue with them
*/
#if 0
/* this is some custom control message they send */
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
0x04, USB_TYPE_VENDOR,
0x0808, 0x0000, NULL, 0, HZ * 3);
dprintk("%s - res = %d", __func__, res);
/* this is another custom control message they send */
res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
0x02, USB_TYPE_VENDOR,
0x0000, 0x0100, NULL, 0, HZ * 3);
dprintk("%s - res = %d", __func__, res);
#endif
}
static void msir_cleanup(struct mceusb_device *dev)
{
memset(dev->bulk_in_buffer, 0, dev->bulk_in_size);
dev->usb_valid_bytes_in_bulk_buffer = 0;
dev->last_space = PULSE_MASK;
dev->mce_bytes_left_in_packet = 0;
dev->lircidx = 0;
dev->lirccnt = 0;
memset(dev->lircdata, 0, sizeof(dev->lircdata));
}
static int set_use_inc(void *data)
{
MOD_INC_USE_COUNT;
return 0;
}
static void set_use_dec(void *data)
{
MOD_DEC_USE_COUNT;
}
/*
* msir_fetch_more_data
*
* The goal here is to read in more remote codes from the remote. In
* the event that the remote isn't sending us anything, the caller
* will block until a key is pressed (i.e. this performs phys read,
* filtering, and queueing of data) unless dont_block is set to 1; in
* this situation, it will perform a few reads and will exit out if it
* does not see any appropriate data
*
* dev->lock should be locked when this function is called - fine grain
* locking isn't really important here anyways
*
* This routine always returns the number of words available
*
*/
static int msir_fetch_more_data(struct mceusb_device *dev, int dont_block)
{
int retries = 0;
int words_to_read =
(sizeof(dev->lircdata)/sizeof(lirc_t)) - dev->lirccnt;
int partial, this_read = 0;
int bulkidx = 0;
int bytes_left_in_packet = 0;
signed char *signedp = (signed char *)dev->bulk_in_buffer;
if (words_to_read == 0)
return dev->lirccnt;
/*
* this forces all existing data to be read by lirc before we
* issue another usb command. this is the only form of
* throttling we have
*/
if (dev->lirccnt)
return dev->lirccnt;
/* reserve room for our leading space */
if (dev->last_space)
words_to_read--;
while (words_to_read) {
/* handle signals and USB disconnects */
if (signal_pending(current))
return dev->lirccnt ? dev->lirccnt : -EINTR;
bulkidx = 0;
/* perform data read (phys or from previous buffer) */
/* use leftovers if present, otherwise perform a read */
if (dev->usb_valid_bytes_in_bulk_buffer) {
this_read = dev->usb_valid_bytes_in_bulk_buffer;
partial = this_read;
dev->usb_valid_bytes_in_bulk_buffer = 0;
} else {
int retval;
this_read = dev->bulk_in_size;
partial = 0;
retval = usb_bulk_msg(dev->udev,
usb_rcvbulkpipe(dev->udev,
dev->bulk_in_endpointAddr),
(unsigned char *)dev->bulk_in_buffer,
this_read, &partial, HZ*10);
/*
* retry a few times on overruns; map all
* other errors to -EIO
*/
if (retval) {
if (retval == -EOVERFLOW && retries < 5) {
retries++;
interruptible_sleep_on_timeout(
&dev->wait_q, HZ);
continue;
} else
return -EIO;
}
retries = 0;
if (partial)
this_read = partial;
/* skip the header */
bulkidx += 2;
/* check for empty reads (header only) */
if (this_read == 2) {
/* assume no data */
if (dont_block)
break;
/*
* sleep for a bit before performing
* another read
*/
interruptible_sleep_on_timeout(&dev->wait_q, 1);
continue;
}
}
/* process data */
/* at this point this_read is > 0 */
while (bulkidx < this_read &&
(words_to_read > (dev->last_space ? 1 : 0))) {
/* while( bulkidx < this_read && words_to_read) */
int keycode;
int pulse = 0;
/* read packet length if needed */
if (!bytes_left_in_packet) {
/*
* we assume we are on a packet length
* value. it is possible, in some
* cases, to get a packet that does
* not start with a length, apparently
* due to some sort of fragmenting,
* but occasionally we do not receive
* the second half of a fragment
*/
bytes_left_in_packet =
128 + signedp[bulkidx++];
/*
* unfortunately rather than keep all
* the data in the packetized format,
* the transceiver sends a trailing 8
* bytes that aren't part of the
* transmission from the remote,
* aren't packetized, and don't really
* have any value. we can basically
* tell we have hit them if 1) we have
* a loooong space currently stored
* up, and 2) the bytes_left value for
* this packet is obviously wrong
*/
if (bytes_left_in_packet > 4) {
if (dev->mce_bytes_left_in_packet) {
bytes_left_in_packet =
dev->mce_bytes_left_in_packet;
bulkidx--;
}
bytes_left_in_packet = 0;
bulkidx = this_read;
}
/*
* always clear this if we have a
* valid packet
*/
dev->mce_bytes_left_in_packet = 0;
/*
* continue here to verify we haven't
* hit the end of the bulk_in
*/
continue;
}
/* generate mode2 */
keycode = signedp[bulkidx++];
if (keycode < 0) {
pulse = 1;
keycode += 128;
}
keycode *= MCE_TIME_UNIT;
bytes_left_in_packet--;
if (pulse) {
if (dev->last_space) {
dev->lircdata[dev->lirccnt++] =
dev->last_space;
dev->last_space = 0;
words_to_read--;
/* clear for the pulse */
dev->lircdata[dev->lirccnt] = 0;
}
dev->lircdata[dev->lirccnt] += keycode;
dev->lircdata[dev->lirccnt] |= PULSE_BIT;
} else {
/*
* on pulse->space transition, add one
* for the existing pulse
*/
if (dev->lircdata[dev->lirccnt] &&
!dev->last_space) {
dev->lirccnt++;
words_to_read--;
}
dev->last_space += keycode;
}
}
}
/* save off some info if we're exiting mid-packet, or with leftovers */
if (bytes_left_in_packet)
dev->mce_bytes_left_in_packet = bytes_left_in_packet;
if (bulkidx < this_read) {
dev->usb_valid_bytes_in_bulk_buffer = (this_read - bulkidx);
memcpy(dev->bulk_in_buffer, &(dev->bulk_in_buffer[bulkidx]),
dev->usb_valid_bytes_in_bulk_buffer);
}
return dev->lirccnt;
}
/**
* mceusb_add_to_buf: called by lirc_dev to fetch all available keys
* this is used as a polling interface for us: since we set
* driver->sample_rate we will periodically get the below call to
* check for new data returns 0 on success, or -ENODATA if nothing is
* available
*/
static int mceusb_add_to_buf(void *data, struct lirc_buffer *buf)
{
struct mceusb_device *dev = (struct mceusb_device *) data;
mutex_lock(&dev->lock);
if (!dev->lirccnt) {
int res;
dev->lircidx = 0;
res = msir_fetch_more_data(dev, 1);
if (res == 0)
res = -ENODATA;
if (res < 0) {
mutex_unlock(&dev->lock);
return res;
}
}
if (dev->lirccnt) {
int keys_to_copy;
/* determine available buffer space and available data */
keys_to_copy = lirc_buffer_available(buf);
if (keys_to_copy > dev->lirccnt)
keys_to_copy = dev->lirccnt;
lirc_buffer_write_n(buf,
(unsigned char *) &(dev->lircdata[dev->lircidx]),
keys_to_copy);
dev->lircidx += keys_to_copy;
dev->lirccnt -= keys_to_copy;
mutex_unlock(&dev->lock);
return 0;
}
mutex_unlock(&dev->lock);
return -ENODATA;
}
#if defined(KERNEL_2_5) && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
static void mceusb_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
#else
static void mceusb_write_bulk_callback(struct urb *urb)
#endif
{
struct mceusb_device *dev = (struct mceusb_device *)urb->context;
dprintk("%s - minor %d", __func__, dev->minor);
if ((urb->status != -ENOENT) &&
(urb->status != -ECONNRESET)) {
dprintk("%s - nonzero write buld status received: %d",
__func__, urb->status);
return;
}
return;
}
/**
* mceusb_probe
*
* Called by the usb core when a new device is connected that it
* thinks this driver might be interested in.
*/
#ifdef KERNEL_2_5
static int mceusb_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct usb_host_interface *iface_desc;
#else
static void *mceusb_probe(struct usb_device *udev, unsigned int ifnum,
const struct usb_device_id *id)
{
struct usb_interface *interface = &udev->actconfig->interface[ifnum];
struct usb_interface_descriptor *iface_desc;
#endif
struct mceusb_device *dev = NULL;
struct usb_endpoint_descriptor *endpoint;
struct lirc_driver *driver;
int minor;
size_t buffer_size;
int i;
int retval = -ENOMEM;
char junk[64];
int partial = 0;
/* See if the device offered us matches what we can accept */
if (cpu_to_le16(udev->descriptor.idVendor) != USB_MCEUSB_VENDOR_ID ||
cpu_to_le16(udev->descriptor.idProduct) != USB_MCEUSB_PRODUCT_ID) {
dprintk("Wrong Vendor/Product IDs");
#ifdef KERNEL_2_5
return -ENODEV;
#else
return NULL;
#endif
}
/* select a "subminor" number (part of a minor number) */
mutex_lock(&minor_table_mutex);
for (minor = 0; minor < MAX_DEVICES; ++minor) {
if (minor_table[minor] == NULL)
break;
}
if (minor >= MAX_DEVICES) {
printk(KERN_INFO "Too many devices plugged in, "
"can not handle this device.\n");
goto error;
}
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(struct mceusb_device), GFP_KERNEL);
if (dev == NULL) {
err("Out of memory");
#ifdef KERNEL_2_5
retval = -ENOMEM;
#endif
goto error;
}
minor_table[minor] = dev;
mutex_init(&dev->lock);
dev->udev = udev;
dev->interface = interface;
dev->minor = minor;
/*
* set up the endpoint information, check out the endpoints.
* use only the first bulk-in and bulk-out endpoints
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 5)
iface_desc = &interface->altsetting[0];
#else
iface_desc = interface->cur_altsetting;
#endif
#ifdef KERNEL_2_5
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
#else
for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i];
#endif
if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_BULK)) {
dprintk("we found a bulk in endpoint");
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_in_size = buffer_size;
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
#ifdef KERNEL_2_5
dev->bulk_in_buffer =
usb_buffer_alloc(udev, buffer_size,
GFP_ATOMIC, &dev->dma_in);
#else
dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
#endif
if (!dev->bulk_in_buffer) {
err("Couldn't allocate bulk_in_buffer");
goto error;
}
}
if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
== 0x00)
&& ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_BULK)) {
dprintk("we found a bulk out endpoint");
#ifdef KERNEL_2_5
dev->write_urb = usb_alloc_urb(0, GFP_KERNEL);
#else
dev->write_urb = usb_alloc_urb(0);
#endif
if (!dev->write_urb) {
err("No free urbs available");
goto error;
}
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_out_size = buffer_size;
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
#ifdef KERNEL_2_5
dev->bulk_out_buffer =
usb_buffer_alloc(udev, buffer_size,
GFP_ATOMIC, &dev->dma_out);
#else
dev->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
#endif
if (!dev->bulk_out_buffer) {
err("Couldn't allocate bulk_out_buffer");
goto error;
}
#ifdef KERNEL_2_5
usb_fill_bulk_urb(dev->write_urb, udev,
usb_sndbulkpipe
(udev, endpoint->bEndpointAddress),
dev->bulk_out_buffer, buffer_size,
mceusb_write_bulk_callback, dev);
dev->write_urb->transfer_dma = dev->dma_out;
dev->write_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
#else
FILL_BULK_URB(dev->write_urb, udev,
usb_sndbulkpipe(udev,
endpoint->bEndpointAddress),
dev->bulk_out_buffer, buffer_size,
mceusb_write_bulk_callback, dev);
#endif
}
}
if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
err("Couldn't find both bulk-in and bulk-out endpoints");
goto error;
}
/* init the waitq */
init_waitqueue_head(&dev->wait_q);
/* Set up our lirc driver */
driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
if (!driver) {
err("out of memory");
goto error;
}
strcpy(driver->name, DRIVER_NAME " ");
driver->minor = minor;
driver->code_length = sizeof(lirc_t) * 8;
driver->features = LIRC_CAN_REC_MODE2; /* | LIRC_CAN_SEND_MODE2; */
driver->data = dev;
driver->buffer_size = 128;
driver->set_use_inc = &set_use_inc;
driver->set_use_dec = &set_use_dec;
driver->sample_rate = 80; /* sample at 100hz (10ms) */
driver->add_to_buf = &mceusb_add_to_buf;
#ifdef LIRC_HAVE_SYSFS
driver->dev = &interface->dev;
#endif
driver->owner = THIS_MODULE;
if (lirc_register_driver(driver) < 0) {
kfree(driver);
goto error;
}
dev->driver = driver;
/*
* clear off the first few messages. these look like
* calibration or test data, i can't really tell
* this also flushes in case we have random ir data queued up
*/
for (i = 0; i < 40; i++)
(void) usb_bulk_msg(udev,
usb_rcvbulkpipe(udev,
dev->bulk_in_endpointAddr),
junk, 64, &partial, HZ*10);
msir_cleanup(dev);
mceusb_setup(udev);
#ifdef KERNEL_2_5
/* we can register the device now, as it is ready */
usb_set_intfdata(interface, dev);
#endif
mutex_unlock(&minor_table_mutex);
#ifdef KERNEL_2_5
return 0;
#else
return dev;
#endif
error:
if (likely(dev))
mceusb_delete(dev);
dev = NULL;
dprintk("%s: retval = %x", __func__, retval);
mutex_unlock(&minor_table_mutex);
#ifdef KERNEL_2_5
return retval;
#else
return NULL;
#endif
}
/**
* mceusb_disconnect
*
* Called by the usb core when the device is removed from the system.
*
*/
#ifdef KERNEL_2_5
static void mceusb_disconnect(struct usb_interface *interface)
#else
static void mceusb_disconnect(struct usb_device *udev, void *ptr)
#endif
{
struct mceusb_device *dev;
int minor;
#ifdef KERNEL_2_5
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
#else
dev = (struct mceusb_device *)ptr;
#endif
mutex_lock(&minor_table_mutex);
mutex_lock(&dev->lock);
minor = dev->minor;
/* unhook lirc things */
lirc_unregister_driver(minor);
lirc_buffer_free(dev->driver->rbuf);
kfree(dev->driver->rbuf);
kfree(dev->driver);
mutex_unlock(&dev->lock);
mceusb_delete(dev);
printk(KERN_INFO "Microsoft IR Transceiver #%d now disconnected\n",
minor);
mutex_unlock(&minor_table_mutex);
}
static int __init usb_mceusb_init(void)
{
int result;
/* register this driver with the USB subsystem */
result = usb_register(&mceusb_driver);
#ifdef KERNEL_2_5
if (result) {
#else
if (result < 0) {
#endif
err("usb_register failed for the " DRIVER_NAME
" driver. error number %d", result);
#ifdef KERNEL_2_5
return result;
#else
return -1;
#endif
}
printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION "\n");
return 0;
}
static void __exit usb_mceusb_exit(void)
{
usb_deregister(&mceusb_driver);
}
module_init(usb_mceusb_init);
module_exit(usb_mceusb_exit);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, mceusb_table);
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
EXPORT_NO_SYMBOLS;