keyspan_remote.c

linux-2.6.15.6

		} else {
			err("%s - Error in message, invalid toggle.\n", __FUNCTION__);
		}

		keyspan_load_tester(remote, 5);
		if ((remote->data.tester & STOP_MASK) == STOP) {
			remote->data.tester = remote->data.tester >> 5;
			remote->data.bits_left -= 5;
		} else {
			err("Bad message recieved, no stop bit found.\n");
		}

		dev_dbg(&remote->udev->dev,
			"%s found valid message: system: %d, button: %d, toggle: %d\n",
			__FUNCTION__, message.system, message.button, message.toggle);

		if (message.toggle != remote->toggle) {
			input_regs(remote->input, regs);
			input_report_key(remote->input, keyspan_key_table[message.button], 1);
			input_report_key(remote->input, keyspan_key_table[message.button], 0);
			input_sync(remote->input);
			remote->toggle = message.toggle;
		}

		remote->stage = 0;
		break;
	}
}

/*
 * Routine for sending all the initialization messages to the remote.
 */
static int keyspan_setup(struct usb_device* dev)
{
	int retval = 0;

	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 0x11, 0x40, 0x5601, 0x0, NULL, 0, 0);
	if (retval) {
		dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n",
			__FUNCTION__, retval);
		return(retval);
	}

	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 0x44, 0x40, 0x0, 0x0, NULL, 0, 0);
	if (retval) {
		dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n",
			__FUNCTION__, retval);
		return(retval);
	}

	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 0x22, 0x40, 0x0, 0x0, NULL, 0, 0);
	if (retval) {
		dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n",
			__FUNCTION__, retval);
		return(retval);
	}

	dev_dbg(&dev->dev, "%s - Setup complete.\n", __FUNCTION__);
	return(retval);
}

/*
 * Routine used to handle a new message that has come in.
 */
static void keyspan_irq_recv(struct urb *urb, struct pt_regs *regs)
{
	struct usb_keyspan *dev = urb->context;
	int retval;

	/* Check our status in case we need to bail out early. */
	switch (urb->status) {
	case 0:
		break;

	/* Device went away so don't keep trying to read from it. */
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		return;

	default:
		goto resubmit;
		break;
	}

	if (debug)
		keyspan_print(dev);

	keyspan_check_data(dev, regs);

resubmit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		err ("%s - usb_submit_urb failed with result: %d", __FUNCTION__, retval);
}

static int keyspan_open(struct input_dev *dev)
{
	struct usb_keyspan *remote = dev->private;

	remote->irq_urb->dev = remote->udev;
	if (usb_submit_urb(remote->irq_urb, GFP_KERNEL))
		return -EIO;

	return 0;
}

static void keyspan_close(struct input_dev *dev)
{
	struct usb_keyspan *remote = dev->private;

	usb_kill_urb(remote->irq_urb);
}

static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface)
{

	struct usb_endpoint_descriptor *endpoint;
	int i;

	for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
		endpoint = &iface->endpoint[i].desc;

		if ((endpoint->bEndpointAddress & USB_DIR_IN) &&
		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
			/* we found our interrupt in endpoint */
			return endpoint;
		}
	}

	return NULL;
}

/*
 * Routine that sets up the driver to handle a specific USB device detected on the bus.
 */
static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(interface);
	struct usb_endpoint_descriptor *endpoint;
	struct usb_keyspan *remote;
	struct input_dev *input_dev;
	int i, retval;

	endpoint = keyspan_get_in_endpoint(interface->cur_altsetting);
	if (!endpoint)
		return -ENODEV;

	remote = kzalloc(sizeof(*remote), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!remote || !input_dev) {
		retval = -ENOMEM;
		goto fail1;
	}

	remote->udev = udev;
	remote->input = input_dev;
	remote->interface = interface;
	remote->in_endpoint = endpoint;
	remote->toggle = -1;	/* Set to -1 so we will always not match the toggle from the first remote message. */

	remote->in_buffer = usb_buffer_alloc(udev, RECV_SIZE, SLAB_ATOMIC, &remote->in_dma);
	if (!remote->in_buffer) {
		retval = -ENOMEM;
		goto fail1;
	}

	remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!remote->irq_urb) {
		retval = -ENOMEM;
		goto fail2;
	}

	retval = keyspan_setup(udev);
	if (retval) {
		retval = -ENODEV;
		goto fail3;
	}

	if (udev->manufacturer)
		strlcpy(remote->name, udev->manufacturer, sizeof(remote->name));

	if (udev->product) {
		if (udev->manufacturer)
			strlcat(remote->name, " ", sizeof(remote->name));
		strlcat(remote->name, udev->product, sizeof(remote->name));
	}

	if (!strlen(remote->name))
		snprintf(remote->name, sizeof(remote->name),
			 "USB Keyspan Remote %04x:%04x",
			 le16_to_cpu(udev->descriptor.idVendor),
			 le16_to_cpu(udev->descriptor.idProduct));

	usb_make_path(udev, remote->phys, sizeof(remote->phys));
	strlcat(remote->phys, "/input0", sizeof(remote->phys));

	input_dev->name = remote->name;
	input_dev->phys = remote->phys;
	usb_to_input_id(udev, &input_dev->id);
	input_dev->cdev.dev = &interface->dev;

	input_dev->evbit[0] = BIT(EV_KEY);		/* We will only report KEY events. */
	for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++)
		if (keyspan_key_table[i] != KEY_RESERVED)
			set_bit(keyspan_key_table[i], input_dev->keybit);

	input_dev->private = remote;
	input_dev->open = keyspan_open;
	input_dev->close = keyspan_close;

	/*
	 * Initialize the URB to access the device. The urb gets sent to the device in keyspan_open()
	 */
	usb_fill_int_urb(remote->irq_urb,
			 remote->udev, usb_rcvintpipe(remote->udev, remote->in_endpoint->bEndpointAddress),
			 remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
			 remote->in_endpoint->bInterval);
	remote->irq_urb->transfer_dma = remote->in_dma;
	remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* we can register the device now, as it is ready */
	input_register_device(remote->input);

	/* save our data pointer in this interface device */
	usb_set_intfdata(interface, remote);

	return 0;

 fail3:	usb_free_urb(remote->irq_urb);
 fail2:	usb_buffer_free(udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 fail1:	kfree(remote);
	input_free_device(input_dev);

	return retval;
}

/*
 * Routine called when a device is disconnected from the USB.
 */
static void keyspan_disconnect(struct usb_interface *interface)
{
	struct usb_keyspan *remote;

	remote = usb_get_intfdata(interface);
	usb_set_intfdata(interface, NULL);

	if (remote) {	/* We have a valid driver structure so clean up everything we allocated. */
		input_unregister_device(remote->input);
		usb_kill_urb(remote->irq_urb);
		usb_free_urb(remote->irq_urb);
		usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
		kfree(remote);
	}
}

/*
 * Standard driver set up sections
 */
static struct usb_driver keyspan_driver =
{
	.owner =	THIS_MODULE,
	.name =		"keyspan_remote",
	.probe =	keyspan_probe,
	.disconnect =	keyspan_disconnect,
	.id_table =	keyspan_table
};

static int __init usb_keyspan_init(void)
{
	int result;

	/* register this driver with the USB subsystem */
	result = usb_register(&keyspan_driver);
	if (result)
		err("usb_register failed. Error number %d\n", result);

	return result;
}

static void __exit usb_keyspan_exit(void)
{
	/* deregister this driver with the USB subsystem */
	usb_deregister(&keyspan_driver);
}

module_init(usb_keyspan_init);
module_exit(usb_keyspan_exit);

MODULE_DEVICE_TABLE(usb, keyspan_table);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);