#include <linux/kernel.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/init.h>#include <linux/usb/input.h>#include <asm/unaligned.h> /* * Version Information * v0.0.1 - Original, extremely basic version, 2.4.xx only * v0.0.2 - Updated, works with 2.5.62 and 2.4.20; *           - added pressure-threshold modules param code from *              Alex Perry <alex.perry@ieee.org> */ #define DRIVER_VERSION "v0.0.2"#define DRIVER_AUTHOR "Josh Myer <josh@joshisanerd.com>"#define DRIVER_DESC "USB KB Gear JamStudio Tablet driver"#define DRIVER_LICENSE "GPL" MODULE_AUTHOR(DRIVER_AUTHOR);MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE(DRIVER_LICENSE); #define USB_VENDOR_ID_KBGEAR	0x084e static int kb_pressure_click = 0x10;module_param(kb_pressure_click, int, 0);MODULE_PARM_DESC(kb_pressure_click, "pressure threshold for clicks"); struct kbtab {	signed char *data;	dma_addr_t data_dma;	struct input_dev *dev;	struct usb_device *usbdev;	struct urb *irq;	int x, y;	int button;	int pressure;	__u32 serial[2];	char phys[32];}; static void kbtab_irq(struct urb *urb){	struct kbtab *kbtab = urb->context;	unsigned char *data = kbtab->data;	struct input_dev *dev = kbtab->dev;	int retval; 	switch (urb->status) {	case 0:		/* success */		break;	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;	} 	kbtab->x = le16_to_cpu(get_unaligned((__le16 *) &data[1]));	kbtab->y = le16_to_cpu(get_unaligned((__le16 *) &data[3])); 	kbtab->pressure = (data[5]); 	input_report_key(dev, BTN_TOOL_PEN, 1); 	input_report_abs(dev, ABS_X, kbtab->x);	input_report_abs(dev, ABS_Y, kbtab->y); 	/*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/	input_report_key(dev, BTN_RIGHT, data[0] & 0x02); 	if (-1 == kb_pressure_click) {		input_report_abs(dev, ABS_PRESSURE, kbtab->pressure);	} else {		input_report_key(dev, BTN_LEFT, (kbtab->pressure > kb_pressure_click) ? 1 : 0);	}; 	input_sync(dev);  exit:	retval = usb_submit_urb (urb, GFP_ATOMIC);	if (retval)		err ("%s - usb_submit_urb failed with result %d",		     __FUNCTION__, retval);} static struct usb_device_id kbtab_ids[] = {	{ USB_DEVICE(USB_VENDOR_ID_KBGEAR, 0x1001), .driver_info = 0 },	{ }}; MODULE_DEVICE_TABLE(usb, kbtab_ids); static int kbtab_open(struct input_dev *dev){	struct kbtab *kbtab = dev->private; 	kbtab->irq->dev = kbtab->usbdev;	if (usb_submit_urb(kbtab->irq, GFP_KERNEL))		return -EIO; 	return 0;} static void kbtab_close(struct input_dev *dev){	struct kbtab *kbtab = dev->private; 	usb_kill_urb(kbtab->irq);} static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *id){	struct usb_device *dev = interface_to_usbdev(intf);	struct usb_endpoint_descriptor *endpoint;	struct kbtab *kbtab;	struct input_dev *input_dev; 	kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);	input_dev = input_allocate_device();	if (!kbtab || !input_dev)		goto fail1; 	kbtab->data = usb_buffer_alloc(dev, 8, GFP_KERNEL, &kbtab->data_dma);	if (!kbtab->data)		goto fail1; 	kbtab->irq = usb_alloc_urb(0, GFP_KERNEL);	if (!kbtab->irq)		goto fail2; 	kbtab->usbdev = dev;	kbtab->dev = input_dev; 	usb_make_path(dev, kbtab->phys, sizeof(kbtab->phys));	strlcat(kbtab->phys, "/input0", sizeof(kbtab->phys)); 	input_dev->name = "KB Gear Tablet";	input_dev->phys = kbtab->phys;	usb_to_input_id(dev, &input_dev->id);	input_dev->cdev.dev = &intf->dev;	input_dev->private = kbtab; 	input_dev->open = kbtab_open;	input_dev->close = kbtab_close; 	input_dev->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_MSC);	input_dev->keybit[LONG(BTN_LEFT)] |= BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);	input_dev->keybit[LONG(BTN_DIGI)] |= BIT(BTN_TOOL_PEN) | BIT(BTN_TOUCH);	input_dev->mscbit[0] |= BIT(MSC_SERIAL);	input_set_abs_params(input_dev, ABS_X, 0, 0x2000, 4, 0);	input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0);	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0); 	endpoint = &intf->cur_altsetting->endpoint[0].desc; 	usb_fill_int_urb(kbtab->irq, dev,			 usb_rcvintpipe(dev, endpoint->bEndpointAddress),			 kbtab->data, 8,			 kbtab_irq, kbtab, endpoint->bInterval);	kbtab->irq->transfer_dma = kbtab->data_dma;	kbtab->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 	input_register_device(kbtab->dev); 	usb_set_intfdata(intf, kbtab);	return 0; fail2:	usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);fail1:	input_free_device(input_dev);	kfree(kbtab);	return -ENOMEM;} static void kbtab_disconnect(struct usb_interface *intf){	struct kbtab *kbtab = usb_get_intfdata(intf); 	usb_set_intfdata(intf, NULL);	if (kbtab) {		usb_kill_urb(kbtab->irq);		input_unregister_device(kbtab->dev);		usb_free_urb(kbtab->irq);		usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma);		kfree(kbtab);	}} static struct usb_driver kbtab_driver = {	.name =		"kbtab",	.probe =	kbtab_probe,	.disconnect =	kbtab_disconnect,	.id_table =	kbtab_ids,}; static int __init kbtab_init(void){	int retval;	retval = usb_register(&kbtab_driver);	if (retval)		goto out;	info(DRIVER_VERSION ":" DRIVER_DESC);out:	return retval;} static void __exit kbtab_exit(void){	usb_deregister(&kbtab_driver);} module_init(kbtab_init);module_exit(kbtab_exit);