usbtouchscreen.c

usb driver for 2.6.17

		.min_xc		= 0x0,
		.max_xc		= 0x07ff,
		.min_yc		= 0x0,
		.max_yc		= 0x07ff,
		.rept_size	= 16,
		.flags		= USBTOUCH_FLG_BUFFER,
		.process_pkt	= egalax_process,
		.read_data	= egalax_read_data,
	},
#endif

#ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
	[DEVTYPE_PANJIT] = {
		.min_xc		= 0x0,
		.max_xc		= 0x0fff,
		.min_yc		= 0x0,
		.max_yc		= 0x0fff,
		.rept_size	= 8,
		.read_data	= panjit_read_data,
	},
#endif

#ifdef CONFIG_USB_TOUCHSCREEN_3M
	[DEVTYPE_3M] = {
		.min_xc		= 0x0,
		.max_xc		= 0x4000,
		.min_yc		= 0x0,
		.max_yc		= 0x4000,
		.rept_size	= 11,
		.read_data	= mtouch_read_data,
		.init		= mtouch_init,
	},
#endif

#ifdef CONFIG_USB_TOUCHSCREEN_ITM
	[DEVTYPE_ITM] = {
		.min_xc		= 0x0,
		.max_xc		= 0x0fff,
		.min_yc		= 0x0,
		.max_yc		= 0x0fff,
		.max_press	= 0xff,
		.rept_size	= 8,
		.read_data	= itm_read_data,
	},
#endif
};


/*****************************************************************************
 * Generic Part
 */
static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
                                 struct pt_regs *regs, unsigned char *pkt, int len)
{
	int x, y, touch, press;
	struct usbtouch_device_info *type = usbtouch->type;

	if (!type->read_data(pkt, &x, &y, &touch, &press))
			return;

	input_regs(usbtouch->input, regs);
	input_report_key(usbtouch->input, BTN_TOUCH, touch);

	if (swap_xy) {
		input_report_abs(usbtouch->input, ABS_X, y);
		input_report_abs(usbtouch->input, ABS_Y, x);
	} else {
		input_report_abs(usbtouch->input, ABS_X, x);
		input_report_abs(usbtouch->input, ABS_Y, y);
	}
	if (type->max_press)
		input_report_abs(usbtouch->input, ABS_PRESSURE, press);
	input_sync(usbtouch->input);
}


static void usbtouch_irq(struct urb *urb, struct pt_regs *regs)
{
	struct usbtouch_usb *usbtouch = urb->context;
	int retval;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	case -ETIMEDOUT:
		/* this urb is timing out */
		dbg("%s - urb timed out - was the device unplugged?",
		    __FUNCTION__);
		return;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d",
		    __FUNCTION__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d",
		    __FUNCTION__, urb->status);
		goto exit;
	}

	usbtouch->type->process_pkt(usbtouch, regs, usbtouch->data, urb->actual_length);

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

static int usbtouch_open(struct input_dev *input)
{
	struct usbtouch_usb *usbtouch = input->private;

	usbtouch->irq->dev = usbtouch->udev;

	if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
		return -EIO;

	return 0;
}

static void usbtouch_close(struct input_dev *input)
{
	struct usbtouch_usb *usbtouch = input->private;

	usb_kill_urb(usbtouch->irq);
}


static void usbtouch_free_buffers(struct usb_device *udev,
				  struct usbtouch_usb *usbtouch)
{
	if (usbtouch->data)
		usb_buffer_free(udev, usbtouch->type->rept_size,
		                usbtouch->data, usbtouch->data_dma);
	kfree(usbtouch->buffer);
}


static int usbtouch_probe(struct usb_interface *intf,
			  const struct usb_device_id *id)
{
	struct usbtouch_usb *usbtouch;
	struct input_dev *input_dev;
	struct usb_host_interface *interface;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usbtouch_device_info *type;
	int err;

	interface = intf->cur_altsetting;
	endpoint = &interface->endpoint[0].desc;

	usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!usbtouch || !input_dev)
		goto out_free;

	type = &usbtouch_dev_info[id->driver_info];
	usbtouch->type = type;
	if (!type->process_pkt)
		type->process_pkt = usbtouch_process_pkt;

	usbtouch->data = usb_buffer_alloc(udev, type->rept_size,
	                                  SLAB_KERNEL, &usbtouch->data_dma);
	if (!usbtouch->data)
		goto out_free;

	if (type->flags & USBTOUCH_FLG_BUFFER) {
		usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
		if (!usbtouch->buffer)
			goto out_free_buffers;
	}

	usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
	if (!usbtouch->irq) {
		dbg("%s - usb_alloc_urb failed: usbtouch->irq", __FUNCTION__);
		goto out_free_buffers;
	}

	usbtouch->udev = udev;
	usbtouch->input = input_dev;

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

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

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

	usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
	strlcpy(usbtouch->phys, "/input0", sizeof(usbtouch->phys));

	input_dev->name = usbtouch->name;
	input_dev->phys = usbtouch->phys;
	usb_to_input_id(udev, &input_dev->id);
	input_dev->cdev.dev = &intf->dev;
	input_dev->private = usbtouch;
	input_dev->open = usbtouch_open;
	input_dev->close = usbtouch_close;

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
	input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
	if (type->max_press)
		input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
		                     type->max_press, 0, 0);

	usb_fill_int_urb(usbtouch->irq, usbtouch->udev,
			 usb_rcvintpipe(usbtouch->udev, 0x81),
			 usbtouch->data, type->rept_size,
			 usbtouch_irq, usbtouch, endpoint->bInterval);

	usbtouch->irq->transfer_dma = usbtouch->data_dma;
	usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* device specific init */
	if (type->init) {
		err = type->init(usbtouch);
		if (err) {
			dbg("%s - type->init() failed, err: %d", __FUNCTION__, err);
			goto out_free_buffers;
		}
	}

	err = input_register_device(usbtouch->input);
	if (err) {
		dbg("%s - input_register_device failed, err: %d", __FUNCTION__, err);
		goto out_free_buffers;
	}

	usb_set_intfdata(intf, usbtouch);

	return 0;

out_free_buffers:
	usbtouch_free_buffers(udev, usbtouch);
out_free:
	input_free_device(input_dev);
	kfree(usbtouch);
	return -ENOMEM;
}

static void usbtouch_disconnect(struct usb_interface *intf)
{
	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);

	dbg("%s - called", __FUNCTION__);

	if (!usbtouch)
		return;

	dbg("%s - usbtouch is initialized, cleaning up", __FUNCTION__);
	usb_set_intfdata(intf, NULL);
	usb_kill_urb(usbtouch->irq);
	input_unregister_device(usbtouch->input);
	usb_free_urb(usbtouch->irq);
	usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
	kfree(usbtouch);
}

MODULE_DEVICE_TABLE(usb, usbtouch_devices);

static struct usb_driver usbtouch_driver = {
	.name		= "usbtouchscreen",
	.probe		= usbtouch_probe,
	.disconnect	= usbtouch_disconnect,
	.id_table	= usbtouch_devices,
};

static int __init usbtouch_init(void)
{
	return usb_register(&usbtouch_driver);
}

static void __exit usbtouch_cleanup(void)
{
	usb_deregister(&usbtouch_driver);
}

module_init(usbtouch_init);
module_exit(usbtouch_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

MODULE_ALIAS("touchkitusb");
MODULE_ALIAS("itmtouch");
MODULE_ALIAS("mtouchusb");