// SPDX-License-Identifier: GPL-2.0-only#include <linux/kernel.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/usb/input.h>#include <linux/unaligned.h> /* * Pressure-threshold modules param code from Alex Perry <alex.perry@ieee.org> */ MODULE_AUTHOR("Josh Myer <josh@joshisanerd.com>");MODULE_DESCRIPTION("USB KB Gear JamStudio Tablet driver");MODULE_LICENSE("GPL"); #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 {	unsigned char *data;	dma_addr_t data_dma;	struct input_dev *dev;	struct usb_interface *intf;	struct urb *irq;	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 pressure;	int retval; 	switch (urb->status) {	case 0:		/* success */		break;	case -ECONNRESET:	case -ENOENT:	case -ESHUTDOWN:		/* this urb is terminated, clean up */		dev_dbg(&kbtab->intf->dev,			"%s - urb shutting down with status: %d\n",			__func__, urb->status);		return;	default:		dev_dbg(&kbtab->intf->dev,			"%s - nonzero urb status received: %d\n",			__func__, urb->status);		goto exit;	}  	input_report_key(dev, BTN_TOOL_PEN, 1); 	input_report_abs(dev, ABS_X, get_unaligned_le16(&data[1]));	input_report_abs(dev, ABS_Y, get_unaligned_le16(&data[3])); 	/*input_report_key(dev, BTN_TOUCH , data[0] & 0x01);*/	input_report_key(dev, BTN_RIGHT, data[0] & 0x02); 	pressure = data[5];	if (kb_pressure_click == -1)		input_report_abs(dev, ABS_PRESSURE, pressure);	else		input_report_key(dev, BTN_LEFT, pressure > kb_pressure_click ? 1 : 0); 	input_sync(dev);  exit:	retval = usb_submit_urb(urb, GFP_ATOMIC);	if (retval)		dev_err(&kbtab->intf->dev,			"%s - usb_submit_urb failed with result %d\n",			__func__, retval);} static const 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 = input_get_drvdata(dev);	struct usb_device *udev = interface_to_usbdev(kbtab->intf); 	kbtab->irq->dev = udev;	if (usb_submit_urb(kbtab->irq, GFP_KERNEL))		return -EIO; 	return 0;} static void kbtab_close(struct input_dev *dev){	struct kbtab *kbtab = input_get_drvdata(dev); 	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;	int error = -ENOMEM; 	if (intf->cur_altsetting->desc.bNumEndpoints < 1)		return -ENODEV; 	endpoint = &intf->cur_altsetting->endpoint[0].desc;	if (!usb_endpoint_is_int_in(endpoint))		return -ENODEV; 	kbtab = kzalloc_obj(*kbtab);	input_dev = input_allocate_device();	if (!kbtab || !input_dev)		goto fail1; 	kbtab->data = usb_alloc_coherent(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->intf = intf;	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->dev.parent = &intf->dev; 	input_set_drvdata(input_dev, kbtab); 	input_dev->open = kbtab_open;	input_dev->close = kbtab_close; 	input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);	input_dev->keybit[BIT_WORD(BTN_LEFT)] |=		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);	input_dev->keybit[BIT_WORD(BTN_DIGI)] |=		BIT_MASK(BTN_TOOL_PEN) | BIT_MASK(BTN_TOUCH);	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); 	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; 	error = input_register_device(kbtab->dev);	if (error)		goto fail3; 	usb_set_intfdata(intf, kbtab); 	return 0;  fail3:	usb_free_urb(kbtab->irq); fail2:	usb_free_coherent(dev, 8, kbtab->data, kbtab->data_dma); fail1:	input_free_device(input_dev);	kfree(kbtab);	return error;} static void kbtab_disconnect(struct usb_interface *intf){	struct kbtab *kbtab = usb_get_intfdata(intf);	struct usb_device *udev = interface_to_usbdev(intf); 	usb_set_intfdata(intf, NULL); 	input_unregister_device(kbtab->dev);	usb_free_urb(kbtab->irq);	usb_free_coherent(udev, 8, 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,}; module_usb_driver(kbtab_driver);