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Subject[PATCH 03/18] lirc driver for 1st-gen Media Center Ed. USB IR transceivers
Date
Works a treat with the lirc_mceusb receiver hooked to my own mythtv frontend,
feeding it signals from a Logitech Harmony 880 remote.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Janne Grunau <j@jannau.net>
CC: Christoph Bartelmus <lirc@bartelmus.de>
Tested-by: Jarod Wilson <jarod@redhat.com>
---
drivers/input/lirc/Kconfig | 7 +
drivers/input/lirc/Makefile | 1 +
drivers/input/lirc/lirc_mceusb.c | 890 ++++++++++++++++++++++++++++++++++++++
3 files changed, 898 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/lirc/lirc_mceusb.c

diff --git a/drivers/input/lirc/Kconfig b/drivers/input/lirc/Kconfig
index 73403b9..7dbf1a5 100644
--- a/drivers/input/lirc/Kconfig
+++ b/drivers/input/lirc/Kconfig
@@ -18,6 +18,13 @@ config LIRC_DEV
help
LIRC device loadable module support, required for most LIRC drivers

+config LIRC_MCEUSB
+ tristate "Microsoft Media Center Ed. Receiver, v1"
+ default n
+ depends on LIRC_DEV
+ help
+ Driver for the Microsoft Media Center Ed. Receiver, v1
+
config LIRC_SERIAL
tristate "Homebrew Serial Port Receiver"
default n
diff --git a/drivers/input/lirc/Makefile b/drivers/input/lirc/Makefile
index 7d76128..fafdd25 100644
--- a/drivers/input/lirc/Makefile
+++ b/drivers/input/lirc/Makefile
@@ -6,4 +6,5 @@
EXTRA_CFLAGS =-DIRCTL_DEV_MAJOR=61 -DLIRC_SERIAL_TRANSMITTER -I$(src)

obj-$(CONFIG_LIRC_DEV) += lirc_dev.o
+obj-$(CONFIG_LIRC_MCEUSB) += lirc_mceusb.o
obj-$(CONFIG_LIRC_SERIAL) += lirc_serial.o
diff --git a/drivers/input/lirc/lirc_mceusb.c b/drivers/input/lirc/lirc_mceusb.c
new file mode 100644
index 0000000..f1874f3
--- /dev/null
+++ b/drivers/input/lirc/lirc_mceusb.c
@@ -0,0 +1,890 @@
+/*
+ * USB Microsoft IR Transceiver driver - 0.2
+ *
+ * Copyright (c) 2003-2004 Dan Conti (dconti@acm.wwu.edu)
+ *
+ * This driver is based on the USB skeleton driver packaged with the
+ * kernel, and the notice from that package has been retained below.
+ *
+ * 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. This driver was
+ * originally based on the USB skeleton driver, although significant
+ * portions of that code have been removed as the driver has evolved.
+ *
+ * 2003_11_11 - Restructured to minimalize code interpretation in the
+ * driver. The normal use case will be with lirc.
+ *
+ * 2004_01_01 - Removed all code interpretation. Generate mode2 data
+ * for passing off to lirc. Cleanup
+ *
+ * 2004_01_04 - Removed devfs handle. Put in a temporary workaround
+ * for a known issue where repeats generate two
+ * sequential spaces (last_was_repeat_gap)
+ *
+ * 2004_02_17 - Changed top level api to no longer use fops, and
+ * instead use new interface for polling via
+ * lirc_thread. Restructure data read/mode2 generation to
+ * a single pass, reducing number of buffers. Rev to .2
+ *
+ * 2004_02_27 - Last of fixups to plugin->add_to_buf API. Properly
+ * handle broken fragments from the receiver. Up the
+ * sample rate and remove any pacing from
+ * fetch_more_data. Fixes all known issues.
+ *
+ * TODO
+ * - Fix up minor number, registration of major/minor with usb subsystem
+ *
+ */
+/*
+ * USB Skeleton driver - 1.1
+ *
+ * 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, version 2.
+ *
+ *
+ * This driver is to be used as a skeleton driver to be able to create a
+ * USB driver quickly. The design of it is based on the usb-serial and
+ * dc2xx drivers.
+ *
+ * Thanks to Oliver Neukum, David Brownell, and Alan Stern for their help
+ * in debugging this driver.
+ *
+ *
+ * History:
+ *
+ * 2003-05-06 - 1.1 - changes due to usb core changes with usb_register_dev()
+ * 2003-02-25 - 1.0 - fix races involving urb->status, unlink_urb(), and
+ * disconnect. Fix transfer amount in read(). Use
+ * macros instead of magic numbers in probe(). Change
+ * size variables to size_t. Show how to eliminate
+ * DMA bounce buffer.
+ * 2002_12_12 - 0.9 - compile fixes and got rid of fixed minor array.
+ * 2002_09_26 - 0.8 - changes due to USB core conversion to struct device
+ * driver.
+ * 2002_02_12 - 0.7 - zero out dev in probe function for devices that do
+ * not have both a bulk in and bulk out endpoint.
+ * Thanks to Holger Waechtler for the fix.
+ * 2001_11_05 - 0.6 - fix minor locking problem in skel_disconnect.
+ * Thanks to Pete Zaitcev for the fix.
+ * 2001_09_04 - 0.5 - fix devfs bug in skel_disconnect. Thanks to wim delvaux
+ * 2001_08_21 - 0.4 - more small bug fixes.
+ * 2001_05_29 - 0.3 - more bug fixes based on review from linux-usb-devel
+ * 2001_05_24 - 0.2 - bug fixes based on review from linux-usb-devel people
+ * 2001_05_01 - 0.1 - first version
+ *
+ */
+
+#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>
+#include <linux/completion.h>
+#include <linux/uaccess.h>
+
+#ifdef CONFIG_USB_DEBUG
+static int debug = 1;
+#else
+static int debug;
+#endif
+
+#include "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_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 usb_skel {
+ 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 */
+
+ atomic_t write_busy; /* true iff write urb is busy */
+ struct completion write_finished; /* wait for the write to finish */
+
+ wait_queue_head_t wait_q; /* for timeouts */
+ int open_count; /* number of times this port has been opened */
+ struct mutex sem; /* locks this structure */
+
+ int present; /* if the device is not disconnected */
+
+ struct lirc_plugin *plugin;
+
+ int 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;
+
+ dma_addr_t dma_in;
+ dma_addr_t dma_out;
+};
+
+#define MCE_TIME_UNIT 50
+
+/* driver api */
+static int mceusb_probe(struct usb_interface *interface,
+ const struct usb_device_id *id);
+static void mceusb_disconnect(struct usb_interface *interface);
+static void mceusb_write_bulk_callback(struct urb *urb);
+
+/* read data from the usb bus; convert to mode2 */
+static int msir_fetch_more_data(struct usb_skel *dev, int dont_block);
+
+/* helper functions */
+static void msir_cleanup(struct usb_skel *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 usb_skel *minor_table[MAX_DEVICES];
+
+/* lock to protect the minor_table structure */
+static DECLARE_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 = {
+ .name = DRIVER_NAME,
+ .probe = mceusb_probe,
+ .disconnect = mceusb_disconnect,
+ .id_table = mceusb_table,
+};
+
+
+/**
+ * usb_mceusb_debug_data
+ */
+static inline void usb_mceusb_debug_data(const char *function, int size,
+ const unsigned char *data)
+{
+ int i;
+ if (!debug)
+ return;
+
+ printk(KERN_DEBUG __FILE__": %s - length = %d, data = ",
+ function, size);
+ for (i = 0; i < size; ++i)
+ printk(KERN_DEBUG "%.2x ", data[i]);
+ printk(KERN_DEBUG "\n");
+}
+
+/**
+ *mceusb_delete
+ */
+static inline void mceusb_delete(struct usb_skel *dev)
+{
+ dprintk("%s", __func__);
+ minor_table[dev->minor] = NULL;
+ 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);
+ 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 dont 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 usb_skel *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)
+{
+ return 0;
+}
+
+static void set_use_dec(void *data)
+{
+}
+
+/*
+ * 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->sem 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 usb_skel *dev, int dont_block)
+{
+ int retries = 0;
+ int words_to_read =
+ (sizeof(dev->lircdata)/sizeof(int)) - 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;
+ if (!dev->udev)
+ return -ENODEV;
+
+ 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 occaisonally 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
+ * transmittion from the remote,
+ * aren't packetized, and dont 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 are 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
+ * plugin->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 usb_skel *dev = (struct usb_skel *) data;
+
+ mutex_lock(&dev->sem);
+
+ /* verify device still present */
+ if (dev->udev == NULL) {
+ mutex_unlock(&dev->sem);
+ return -ENODEV;
+ }
+
+ 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->sem);
+ 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->sem);
+ return 0;
+ }
+
+ mutex_unlock(&dev->sem);
+ return -ENODATA;
+}
+
+/**
+ * mceusb_write_bulk_callback
+ */
+static void mceusb_write_bulk_callback(struct urb *urb)
+{
+ struct usb_skel *dev = (struct usb_skel *)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.
+ */
+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;
+ struct usb_skel *dev = NULL;
+ struct usb_endpoint_descriptor *endpoint;
+
+ struct lirc_plugin *plugin;
+ struct lirc_buffer *rbuf;
+
+ 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");
+ return -ENODEV;
+ }
+
+ /* select a "subminor" number (part of a minor number) */
+ down(&minor_table_mutex);
+ for (minor = 0; minor < MAX_DEVICES; ++minor) {
+ if (minor_table[minor] == NULL)
+ break;
+ }
+ if (minor >= MAX_DEVICES) {
+ info("Too many devices plugged in, "
+ "can not handle this device.");
+ goto error;
+ }
+
+ /* allocate memory for our device state and initialize it */
+ dev = kmalloc(sizeof(struct usb_skel), GFP_KERNEL);
+ if (dev == NULL) {
+ err("Out of memory");
+ retval = -ENOMEM;
+ goto error;
+ }
+ minor_table[minor] = dev;
+
+ memset(dev, 0x00, sizeof(*dev));
+ mutex_init(&dev->sem);
+ 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 */
+ iface_desc = interface->cur_altsetting;
+
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ endpoint = &iface_desc->endpoint[i].desc;
+ 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;
+ dev->bulk_in_buffer =
+ usb_buffer_alloc(udev, buffer_size,
+ GFP_ATOMIC, &dev->dma_in);
+ 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");
+ dev->write_urb = usb_alloc_urb(0, GFP_KERNEL);
+ 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;
+ dev->bulk_out_buffer =
+ usb_buffer_alloc(udev, buffer_size,
+ GFP_ATOMIC, &dev->dma_out);
+ if (!dev->bulk_out_buffer) {
+ err("Couldn't allocate bulk_out_buffer");
+ goto error;
+ }
+ usb_fill_bulk_urb(dev->write_urb, udev,
+ usb_sndbulkpipe
+ (udev, endpoint->bEndpointAddress),
+ dev->bulk_out_buffer, buffer_size,
+ mceusb_write_bulk_callback, dev);
+ }
+ }
+
+ 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 plugin */
+ plugin = kmalloc(sizeof(struct lirc_plugin), GFP_KERNEL);
+ if (!plugin) {
+ err("out of memory");
+ goto error;
+ }
+ memset(plugin, 0, sizeof(struct lirc_plugin));
+
+ rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+ if (!rbuf) {
+ err("out of memory");
+ kfree(plugin);
+ goto error;
+ }
+
+ /* the lirc_atiusb module doesn't memset rbuf here ... ? */
+ if (lirc_buffer_init(rbuf, sizeof(int), 128)) {
+ err("out of memory");
+ kfree(plugin);
+ kfree(rbuf);
+ goto error;
+ }
+
+ strcpy(plugin->name, DRIVER_NAME " ");
+ plugin->minor = minor;
+ plugin->code_length = sizeof(int) * 8;
+ plugin->features = LIRC_CAN_REC_MODE2; /* | LIRC_CAN_SEND_MODE2; */
+ plugin->data = dev;
+ plugin->rbuf = rbuf;
+ plugin->ioctl = NULL;
+ plugin->set_use_inc = &set_use_inc;
+ plugin->set_use_dec = &set_use_dec;
+ plugin->sample_rate = 80; /* sample at 100hz (10ms) */
+ plugin->add_to_buf = &mceusb_add_to_buf;
+ /* plugin->fops = &mceusb_fops; */
+ plugin->dev = &udev->dev;
+ plugin->owner = THIS_MODULE;
+ if (lirc_register_plugin(plugin) < 0) {
+ kfree(plugin);
+ lirc_buffer_free(rbuf);
+ kfree(rbuf);
+ goto error;
+ }
+ dev->plugin = plugin;
+
+ /* 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);
+
+ /* we can register the device now, as it is ready */
+ usb_set_intfdata(interface, dev);
+ /* let the user know what node this device is now attached to */
+ /* info("USB Microsoft IR Transceiver device now attached to msir%d",
+ dev->minor); */
+ up(&minor_table_mutex);
+ return 0;
+error:
+ mceusb_delete(dev);
+ dev = NULL;
+ dprintk("%s: retval = %x", __func__, retval);
+ up(&minor_table_mutex);
+ return retval;
+}
+
+/**
+ * mceusb_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 skel_read(), does
+ * not provide any way to do this. But at least we can cancel an active
+ * write.
+ */
+static void mceusb_disconnect(struct usb_interface *interface)
+{
+ struct usb_skel *dev;
+ int minor;
+ dev = usb_get_intfdata(interface);
+ usb_set_intfdata(interface, NULL);
+
+ down(&minor_table_mutex);
+ mutex_lock(&dev->sem);
+ minor = dev->minor;
+
+ /* unhook lirc things */
+ lirc_unregister_plugin(minor);
+ lirc_buffer_free(dev->plugin->rbuf);
+ kfree(dev->plugin->rbuf);
+ kfree(dev->plugin);
+ /* terminate an ongoing write */
+ if (atomic_read(&dev->write_busy)) {
+ usb_kill_urb(dev->write_urb);
+ wait_for_completion(&dev->write_finished);
+ }
+
+ /* prevent device read, write and ioctl */
+ dev->present = 0;
+
+ mceusb_delete(dev);
+
+ info("Microsoft IR Transceiver #%d now disconnected", minor);
+ mutex_unlock(&dev->sem);
+ up(&minor_table_mutex);
+}
+
+
+
+/**
+ * usb_mceusb_init
+ */
+static int __init usb_mceusb_init(void)
+{
+ int result;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&mceusb_driver);
+ if (result) {
+ err("usb_register failed for the " DRIVER_NAME
+ " driver. error number %d", result);
+ return result;
+ }
+
+ info(DRIVER_DESC " " DRIVER_VERSION);
+ return 0;
+}
+
+
+/**
+ * usb_mceusb_exit
+ */
+static void __exit usb_mceusb_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&mceusb_driver);
+}
+
+#ifdef MODULE
+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, 0644);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+#else /* not MODULE */
+subsys_initcall(usb_mceusb_init);
+
+#endif /* MODULE */
--
1.6.0.1


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