drivers/input/tablet/hanwang.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  USB Hanwang tablet support
  *
  *  Copyright (c) 2010 Xing Wei <weixing@hanwang.com.cn>
  */

 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/usb/input.h>

 MODULE_AUTHOR("Xing Wei <weixing@hanwang.com.cn>");
 MODULE_DESCRIPTION("USB Hanwang tablet driver");
 MODULE_LICENSE("GPL");

 #define USB_VENDOR_ID_HANWANG		0x0b57
 #define HANWANG_TABLET_INT_CLASS	0x0003
 #define HANWANG_TABLET_INT_SUB_CLASS	0x0001
 #define HANWANG_TABLET_INT_PROTOCOL	0x0002

 #define ART_MASTER_PKGLEN_MAX	10

 /* device IDs */
 #define STYLUS_DEVICE_ID	0x02
 #define TOUCH_DEVICE_ID		0x03
 #define CURSOR_DEVICE_ID	0x06
 #define ERASER_DEVICE_ID	0x0A
 #define PAD_DEVICE_ID		0x0F

 /* match vendor and interface info  */
 #define HANWANG_TABLET_DEVICE(vend, cl, sc, pr) \
 	.match_flags = USB_DEVICE_ID_MATCH_VENDOR \
 		| USB_DEVICE_ID_MATCH_INT_INFO, \
 	.idVendor = (vend), \
 	.bInterfaceClass = (cl), \
 	.bInterfaceSubClass = (sc), \
 	.bInterfaceProtocol = (pr)

 enum hanwang_tablet_type {
 	HANWANG_ART_MASTER_III,
 	HANWANG_ART_MASTER_HD,
 	HANWANG_ART_MASTER_II,
 };

 struct hanwang {
 	unsigned char *data;
 	dma_addr_t data_dma;
 	struct input_dev *dev;
 	struct usb_device *usbdev;
 	struct urb *irq;
 	const struct hanwang_features *features;
 	unsigned int current_tool;
 	unsigned int current_id;
 	char name[64];
 	char phys[32];
 };

 struct hanwang_features {
 	unsigned short pid;
 	char *name;
 	enum hanwang_tablet_type type;
 	int pkg_len;
 	int max_x;
 	int max_y;
 	int max_tilt_x;
 	int max_tilt_y;
 	int max_pressure;
 };

 static const struct hanwang_features features_array[] = {
 	{ 0x8528, "Hanwang Art Master III 0906", HANWANG_ART_MASTER_III,
 	  ART_MASTER_PKGLEN_MAX, 0x5757, 0x3692, 0x3f, 0x7f, 2048 },
 	{ 0x8529, "Hanwang Art Master III 0604", HANWANG_ART_MASTER_III,
 	  ART_MASTER_PKGLEN_MAX, 0x3d84, 0x2672, 0x3f, 0x7f, 2048 },
 	{ 0x852a, "Hanwang Art Master III 1308", HANWANG_ART_MASTER_III,
 	  ART_MASTER_PKGLEN_MAX, 0x7f00, 0x4f60, 0x3f, 0x7f, 2048 },
 	{ 0x8401, "Hanwang Art Master HD 5012", HANWANG_ART_MASTER_HD,
 	  ART_MASTER_PKGLEN_MAX, 0x678e, 0x4150, 0x3f, 0x7f, 1024 },
 	{ 0x8503, "Hanwang Art Master II", HANWANG_ART_MASTER_II,
 	  ART_MASTER_PKGLEN_MAX, 0x27de, 0x1cfe, 0x3f, 0x7f, 1024 },
 };

 static const int hw_eventtypes[] = {
 	EV_KEY, EV_ABS, EV_MSC,
 };

 static const int hw_absevents[] = {
 	ABS_X, ABS_Y, ABS_TILT_X, ABS_TILT_Y, ABS_WHEEL,
 	ABS_RX, ABS_RY, ABS_PRESSURE, ABS_MISC,
 };

 static const int hw_btnevents[] = {
 	BTN_STYLUS, BTN_STYLUS2, BTN_TOOL_PEN, BTN_TOOL_RUBBER,
 	BTN_TOOL_MOUSE, BTN_TOOL_FINGER,
 	BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8,
 };

 static const int hw_mscevents[] = {
 	MSC_SERIAL,
 };

 static void hanwang_parse_packet(struct hanwang *hanwang)
 {
 	unsigned char *data = hanwang->data;
 	struct input_dev *input_dev = hanwang->dev;
 	struct usb_device *dev = hanwang->usbdev;
 	enum hanwang_tablet_type type = hanwang->features->type;
 	int i;
 	u16 p;

 	if (type == HANWANG_ART_MASTER_II) {
 		hanwang->current_tool = BTN_TOOL_PEN;
 		hanwang->current_id = STYLUS_DEVICE_ID;
 	}

 	switch (data[0]) {
 	case 0x02:	/* data packet */
 		switch (data[1]) {
 		case 0x80:	/* tool prox out */
 			if (type != HANWANG_ART_MASTER_II) {
 				hanwang->current_id = 0;
 				input_report_key(input_dev,
 						 hanwang->current_tool, 0);
 			}
 			break;

 		case 0x00:	/* artmaster ii pen leave */
 			if (type == HANWANG_ART_MASTER_II) {
 				hanwang->current_id = 0;
 				input_report_key(input_dev,
 						 hanwang->current_tool, 0);
 			}
 			break;

 		case 0xc2:	/* first time tool prox in */
 			switch (data[3] & 0xf0) {
 			case 0x20:	/* art_master III */
 			case 0x30:	/* art_master_HD */
 				hanwang->current_id = STYLUS_DEVICE_ID;
 				hanwang->current_tool = BTN_TOOL_PEN;
 				input_report_key(input_dev, BTN_TOOL_PEN, 1);
 				break;
 			case 0xa0:	/* art_master III */
 			case 0xb0:	/* art_master_HD */
 				hanwang->current_id = ERASER_DEVICE_ID;
 				hanwang->current_tool = BTN_TOOL_RUBBER;
 				input_report_key(input_dev, BTN_TOOL_RUBBER, 1);
 				break;
 			default:
 				hanwang->current_id = 0;
 				dev_dbg(&dev->dev,
 					"unknown tablet tool %02x\n", data[0]);
 				break;
 			}
 			break;

 		default:	/* tool data packet */
 			switch (type) {
 			case HANWANG_ART_MASTER_III:
 				p = (data[6] << 3) |
 				    ((data[7] & 0xc0) >> 5) |
 				    (data[1] & 0x01);
 				break;

 			case HANWANG_ART_MASTER_HD:
 			case HANWANG_ART_MASTER_II:
 				p = (data[7] >> 6) | (data[6] << 2);
 				break;

 			default:
 				p = 0;
 				break;
 			}

 			input_report_abs(input_dev, ABS_X,
 					 be16_to_cpup((__be16 *)&data[2]));
 			input_report_abs(input_dev, ABS_Y,
 					 be16_to_cpup((__be16 *)&data[4]));
 			input_report_abs(input_dev, ABS_PRESSURE, p);
 			input_report_abs(input_dev, ABS_TILT_X, data[7] & 0x3f);
 			input_report_abs(input_dev, ABS_TILT_Y, data[8] & 0x7f);
 			input_report_key(input_dev, BTN_STYLUS, data[1] & 0x02);

 			if (type != HANWANG_ART_MASTER_II)
 				input_report_key(input_dev, BTN_STYLUS2,
 						 data[1] & 0x04);
 			else
 				input_report_key(input_dev, BTN_TOOL_PEN, 1);

 			break;
 		}

 		input_report_abs(input_dev, ABS_MISC, hanwang->current_id);
 		input_event(input_dev, EV_MSC, MSC_SERIAL,
 				hanwang->features->pid);
 		break;

 	case 0x0c:
 		/* roll wheel */
 		hanwang->current_id = PAD_DEVICE_ID;

 		switch (type) {
 		case HANWANG_ART_MASTER_III:
 			input_report_key(input_dev, BTN_TOOL_FINGER,
 					 data[1] || data[2] || data[3]);
 			input_report_abs(input_dev, ABS_WHEEL, data[1]);
 			input_report_key(input_dev, BTN_0, data[2]);
 			for (i = 0; i < 8; i++)
 				input_report_key(input_dev,
 					 BTN_1 + i, data[3] & (1 << i));
 			break;

 		case HANWANG_ART_MASTER_HD:
 			input_report_key(input_dev, BTN_TOOL_FINGER, data[1] ||
 					data[2] || data[3] || data[4] ||
 					data[5] || data[6]);
 			input_report_abs(input_dev, ABS_RX,
 					((data[1] & 0x1f) << 8) | data[2]);
 			input_report_abs(input_dev, ABS_RY,
 					((data[3] & 0x1f) << 8) | data[4]);
 			input_report_key(input_dev, BTN_0, data[5] & 0x01);
 			for (i = 0; i < 4; i++) {
 				input_report_key(input_dev,
 					 BTN_1 + i, data[5] & (1 << i));
 				input_report_key(input_dev,
 					 BTN_5 + i, data[6] & (1 << i));
 			}
 			break;

 		case HANWANG_ART_MASTER_II:
 			dev_dbg(&dev->dev, "error packet  %02x\n", data[0]);
 			return;
 		}

 		input_report_abs(input_dev, ABS_MISC, hanwang->current_id);
 		input_event(input_dev, EV_MSC, MSC_SERIAL, 0xffffffff);
 		break;

 	default:
 		dev_dbg(&dev->dev, "error packet  %02x\n", data[0]);
 		break;
 	}

 	input_sync(input_dev);
 }

 static void hanwang_irq(struct urb *urb)
 {
 	struct hanwang *hanwang = urb->context;
 	struct usb_device *dev = hanwang->usbdev;
 	int retval;

 	switch (urb->status) {
 	case 0:
 		/* success */;
 		hanwang_parse_packet(hanwang);
 		break;
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:
 		/* this urb is terminated, clean up */
 		dev_err(&dev->dev, "%s - urb shutting down with status: %d",
 			__func__, urb->status);
 		return;
 	default:
 		dev_err(&dev->dev, "%s - nonzero urb status received: %d",
 			__func__, urb->status);
 		break;
 	}

 	retval = usb_submit_urb(urb, GFP_ATOMIC);
 	if (retval)
 		dev_err(&dev->dev, "%s - usb_submit_urb failed with result %d",
 			__func__, retval);
 }

 static int hanwang_open(struct input_dev *dev)
 {
 	struct hanwang *hanwang = input_get_drvdata(dev);

 	hanwang->irq->dev = hanwang->usbdev;
 	if (usb_submit_urb(hanwang->irq, GFP_KERNEL))
 		return -EIO;

 	return 0;
 }

 static void hanwang_close(struct input_dev *dev)
 {
 	struct hanwang *hanwang = input_get_drvdata(dev);

 	usb_kill_urb(hanwang->irq);
 }

 static bool get_features(struct usb_device *dev, struct hanwang *hanwang)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(features_array); i++) {
 		if (le16_to_cpu(dev->descriptor.idProduct) ==
 				features_array[i].pid) {
 			hanwang->features = &features_array[i];
 			return true;
 		}
 	}

 	return false;
 }


 static int hanwang_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 hanwang *hanwang;
 	struct input_dev *input_dev;
 	int error;
 	int i;

 	if (intf->cur_altsetting->desc.bNumEndpoints < 1)
 		return -ENODEV;

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

 	if (!get_features(dev, hanwang)) {
 		error = -ENXIO;
 		goto fail1;
 	}

 	hanwang->data = usb_alloc_coherent(dev, hanwang->features->pkg_len,
 					GFP_KERNEL, &hanwang->data_dma);
 	if (!hanwang->data) {
 		error = -ENOMEM;
 		goto fail1;
 	}

 	hanwang->irq = usb_alloc_urb(0, GFP_KERNEL);
 	if (!hanwang->irq) {
 		error = -ENOMEM;
 		goto fail2;
 	}

 	hanwang->usbdev = dev;
 	hanwang->dev = input_dev;

 	usb_make_path(dev, hanwang->phys, sizeof(hanwang->phys));
 	strlcat(hanwang->phys, "/input0", sizeof(hanwang->phys));

 	strscpy(hanwang->name, hanwang->features->name, sizeof(hanwang->name));
 	input_dev->name = hanwang->name;
 	input_dev->phys = hanwang->phys;
 	usb_to_input_id(dev, &input_dev->id);
 	input_dev->dev.parent = &intf->dev;

 	input_set_drvdata(input_dev, hanwang);

 	input_dev->open = hanwang_open;
 	input_dev->close = hanwang_close;

 	for (i = 0; i < ARRAY_SIZE(hw_eventtypes); ++i)
 		__set_bit(hw_eventtypes[i], input_dev->evbit);

 	for (i = 0; i < ARRAY_SIZE(hw_absevents); ++i)
 		__set_bit(hw_absevents[i], input_dev->absbit);

 	for (i = 0; i < ARRAY_SIZE(hw_btnevents); ++i)
 		__set_bit(hw_btnevents[i], input_dev->keybit);

 	for (i = 0; i < ARRAY_SIZE(hw_mscevents); ++i)
 		__set_bit(hw_mscevents[i], input_dev->mscbit);

 	input_set_abs_params(input_dev, ABS_X,
 			     0, hanwang->features->max_x, 4, 0);
 	input_set_abs_params(input_dev, ABS_Y,
 			     0, hanwang->features->max_y, 4, 0);
 	input_set_abs_params(input_dev, ABS_TILT_X,
 			     0, hanwang->features->max_tilt_x, 0, 0);
 	input_set_abs_params(input_dev, ABS_TILT_Y,
 			     0, hanwang->features->max_tilt_y, 0, 0);
 	input_set_abs_params(input_dev, ABS_PRESSURE,
 			     0, hanwang->features->max_pressure, 0, 0);

 	endpoint = &intf->cur_altsetting->endpoint[0].desc;
 	usb_fill_int_urb(hanwang->irq, dev,
 			usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 			hanwang->data, hanwang->features->pkg_len,
 			hanwang_irq, hanwang, endpoint->bInterval);
 	hanwang->irq->transfer_dma = hanwang->data_dma;
 	hanwang->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

 	error = input_register_device(hanwang->dev);
 	if (error)
 		goto fail3;

 	usb_set_intfdata(intf, hanwang);

 	return 0;

  fail3:	usb_free_urb(hanwang->irq);
  fail2:	usb_free_coherent(dev, hanwang->features->pkg_len,
 			hanwang->data, hanwang->data_dma);
  fail1:	input_free_device(input_dev);
 	kfree(hanwang);
 	return error;

 }

 static void hanwang_disconnect(struct usb_interface *intf)
 {
 	struct hanwang *hanwang = usb_get_intfdata(intf);

 	input_unregister_device(hanwang->dev);
 	usb_free_urb(hanwang->irq);
 	usb_free_coherent(interface_to_usbdev(intf),
 			hanwang->features->pkg_len, hanwang->data,
 			hanwang->data_dma);
 	kfree(hanwang);
 	usb_set_intfdata(intf, NULL);
 }

 static const struct usb_device_id hanwang_ids[] = {
 	{ HANWANG_TABLET_DEVICE(USB_VENDOR_ID_HANWANG, HANWANG_TABLET_INT_CLASS,
 		HANWANG_TABLET_INT_SUB_CLASS, HANWANG_TABLET_INT_PROTOCOL) },
 	{}
 };

 MODULE_DEVICE_TABLE(usb, hanwang_ids);

 static struct usb_driver hanwang_driver = {
 	.name		= "hanwang",
 	.probe		= hanwang_probe,
 	.disconnect	= hanwang_disconnect,
 	.id_table	= hanwang_ids,
 };

 module_usb_driver(hanwang_driver);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* USB Hanwang tablet support
	*
	* Copyright (c) 2010 Xing Wei <weixing@hanwang.com.cn>
	*/

	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/usb/input.h>

	MODULE_AUTHOR("Xing Wei <weixing@hanwang.com.cn>");
	MODULE_DESCRIPTION("USB Hanwang tablet driver");
	MODULE_LICENSE("GPL");

	#define USB_VENDOR_ID_HANWANG 0x0b57
	#define HANWANG_TABLET_INT_CLASS 0x0003
	#define HANWANG_TABLET_INT_SUB_CLASS 0x0001
	#define HANWANG_TABLET_INT_PROTOCOL 0x0002

	#define ART_MASTER_PKGLEN_MAX 10

	/* device IDs */
	#define STYLUS_DEVICE_ID 0x02
	#define TOUCH_DEVICE_ID 0x03
	#define CURSOR_DEVICE_ID 0x06
	#define ERASER_DEVICE_ID 0x0A
	#define PAD_DEVICE_ID 0x0F

	/* match vendor and interface info */
	#define HANWANG_TABLET_DEVICE(vend, cl, sc, pr) \
	.match_flags = USB_DEVICE_ID_MATCH_VENDOR \
	\| USB_DEVICE_ID_MATCH_INT_INFO, \
	.idVendor = (vend), \
	.bInterfaceClass = (cl), \
	.bInterfaceSubClass = (sc), \
	.bInterfaceProtocol = (pr)

	enum hanwang_tablet_type {
	HANWANG_ART_MASTER_III,
	HANWANG_ART_MASTER_HD,
	HANWANG_ART_MASTER_II,
	};

	struct hanwang {
	unsigned char *data;
	dma_addr_t data_dma;
	struct input_dev *dev;
	struct usb_device *usbdev;
	struct urb *irq;
	const struct hanwang_features *features;
	unsigned int current_tool;
	unsigned int current_id;
	char name[64];
	char phys[32];
	};

	struct hanwang_features {
	unsigned short pid;
	char *name;
	enum hanwang_tablet_type type;
	int pkg_len;
	int max_x;
	int max_y;
	int max_tilt_x;
	int max_tilt_y;
	int max_pressure;
	};

	static const struct hanwang_features features_array[] = {
	{ 0x8528, "Hanwang Art Master III 0906", HANWANG_ART_MASTER_III,
	ART_MASTER_PKGLEN_MAX, 0x5757, 0x3692, 0x3f, 0x7f, 2048 },
	{ 0x8529, "Hanwang Art Master III 0604", HANWANG_ART_MASTER_III,
	ART_MASTER_PKGLEN_MAX, 0x3d84, 0x2672, 0x3f, 0x7f, 2048 },
	{ 0x852a, "Hanwang Art Master III 1308", HANWANG_ART_MASTER_III,
	ART_MASTER_PKGLEN_MAX, 0x7f00, 0x4f60, 0x3f, 0x7f, 2048 },
	{ 0x8401, "Hanwang Art Master HD 5012", HANWANG_ART_MASTER_HD,
	ART_MASTER_PKGLEN_MAX, 0x678e, 0x4150, 0x3f, 0x7f, 1024 },
	{ 0x8503, "Hanwang Art Master II", HANWANG_ART_MASTER_II,
	ART_MASTER_PKGLEN_MAX, 0x27de, 0x1cfe, 0x3f, 0x7f, 1024 },
	};

	static const int hw_eventtypes[] = {
	EV_KEY, EV_ABS, EV_MSC,
	};

	static const int hw_absevents[] = {
	ABS_X, ABS_Y, ABS_TILT_X, ABS_TILT_Y, ABS_WHEEL,
	ABS_RX, ABS_RY, ABS_PRESSURE, ABS_MISC,
	};

	static const int hw_btnevents[] = {
	BTN_STYLUS, BTN_STYLUS2, BTN_TOOL_PEN, BTN_TOOL_RUBBER,
	BTN_TOOL_MOUSE, BTN_TOOL_FINGER,
	BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8,
	};

	static const int hw_mscevents[] = {
	MSC_SERIAL,
	};

	static void hanwang_parse_packet(struct hanwang *hanwang)
	{
	unsigned char *data = hanwang->data;
	struct input_dev *input_dev = hanwang->dev;
	struct usb_device *dev = hanwang->usbdev;
	enum hanwang_tablet_type type = hanwang->features->type;
	int i;
	u16 p;

	if (type == HANWANG_ART_MASTER_II) {
	hanwang->current_tool = BTN_TOOL_PEN;
	hanwang->current_id = STYLUS_DEVICE_ID;
	}

	switch (data[0]) {
	case 0x02: /* data packet */
	switch (data[1]) {
	case 0x80: /* tool prox out */
	if (type != HANWANG_ART_MASTER_II) {
	hanwang->current_id = 0;
	input_report_key(input_dev,
	hanwang->current_tool, 0);
	}
	break;

	case 0x00: /* artmaster ii pen leave */
	if (type == HANWANG_ART_MASTER_II) {
	hanwang->current_id = 0;
	input_report_key(input_dev,
	hanwang->current_tool, 0);
	}
	break;

	case 0xc2: /* first time tool prox in */
	switch (data[3] & 0xf0) {
	case 0x20: /* art_master III */
	case 0x30: /* art_master_HD */
	hanwang->current_id = STYLUS_DEVICE_ID;
	hanwang->current_tool = BTN_TOOL_PEN;
	input_report_key(input_dev, BTN_TOOL_PEN, 1);
	break;
	case 0xa0: /* art_master III */
	case 0xb0: /* art_master_HD */
	hanwang->current_id = ERASER_DEVICE_ID;
	hanwang->current_tool = BTN_TOOL_RUBBER;
	input_report_key(input_dev, BTN_TOOL_RUBBER, 1);
	break;
	default:
	hanwang->current_id = 0;
	dev_dbg(&dev->dev,
	"unknown tablet tool %02x\n", data[0]);
	break;
	}
	break;

	default: /* tool data packet */
	switch (type) {
	case HANWANG_ART_MASTER_III:
	p = (data[6] << 3) \|
	((data[7] & 0xc0) >> 5) \|
	(data[1] & 0x01);
	break;

	case HANWANG_ART_MASTER_HD:
	case HANWANG_ART_MASTER_II:
	p = (data[7] >> 6) \| (data[6] << 2);
	break;

	default:
	p = 0;
	break;
	}

	input_report_abs(input_dev, ABS_X,
	be16_to_cpup((__be16 *)&data[2]));
	input_report_abs(input_dev, ABS_Y,
	be16_to_cpup((__be16 *)&data[4]));
	input_report_abs(input_dev, ABS_PRESSURE, p);
	input_report_abs(input_dev, ABS_TILT_X, data[7] & 0x3f);
	input_report_abs(input_dev, ABS_TILT_Y, data[8] & 0x7f);
	input_report_key(input_dev, BTN_STYLUS, data[1] & 0x02);

	if (type != HANWANG_ART_MASTER_II)
	input_report_key(input_dev, BTN_STYLUS2,
	data[1] & 0x04);
	else
	input_report_key(input_dev, BTN_TOOL_PEN, 1);

	break;
	}

	input_report_abs(input_dev, ABS_MISC, hanwang->current_id);
	input_event(input_dev, EV_MSC, MSC_SERIAL,
	hanwang->features->pid);
	break;

	case 0x0c:
	/* roll wheel */
	hanwang->current_id = PAD_DEVICE_ID;

	switch (type) {
	case HANWANG_ART_MASTER_III:
	input_report_key(input_dev, BTN_TOOL_FINGER,
	data[1] \|\| data[2] \|\| data[3]);
	input_report_abs(input_dev, ABS_WHEEL, data[1]);
	input_report_key(input_dev, BTN_0, data[2]);
	for (i = 0; i < 8; i++)
	input_report_key(input_dev,
	BTN_1 + i, data[3] & (1 << i));
	break;

	case HANWANG_ART_MASTER_HD:
	input_report_key(input_dev, BTN_TOOL_FINGER, data[1] \|\|
	data[2] \|\| data[3] \|\| data[4] \|\|
	data[5] \|\| data[6]);
	input_report_abs(input_dev, ABS_RX,
	((data[1] & 0x1f) << 8) \| data[2]);
	input_report_abs(input_dev, ABS_RY,
	((data[3] & 0x1f) << 8) \| data[4]);
	input_report_key(input_dev, BTN_0, data[5] & 0x01);
	for (i = 0; i < 4; i++) {
	input_report_key(input_dev,
	BTN_1 + i, data[5] & (1 << i));
	input_report_key(input_dev,
	BTN_5 + i, data[6] & (1 << i));
	}
	break;

	case HANWANG_ART_MASTER_II:
	dev_dbg(&dev->dev, "error packet %02x\n", data[0]);
	return;
	}

	input_report_abs(input_dev, ABS_MISC, hanwang->current_id);
	input_event(input_dev, EV_MSC, MSC_SERIAL, 0xffffffff);
	break;

	default:
	dev_dbg(&dev->dev, "error packet %02x\n", data[0]);
	break;
	}

	input_sync(input_dev);
	}

	static void hanwang_irq(struct urb *urb)
	{
	struct hanwang *hanwang = urb->context;
	struct usb_device *dev = hanwang->usbdev;
	int retval;

	switch (urb->status) {
	case 0:
	/* success */;
	hanwang_parse_packet(hanwang);
	break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	/* this urb is terminated, clean up */
	dev_err(&dev->dev, "%s - urb shutting down with status: %d",
	__func__, urb->status);
	return;
	default:
	dev_err(&dev->dev, "%s - nonzero urb status received: %d",
	__func__, urb->status);
	break;
	}

	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
	dev_err(&dev->dev, "%s - usb_submit_urb failed with result %d",
	__func__, retval);
	}

	static int hanwang_open(struct input_dev *dev)
	{
	struct hanwang *hanwang = input_get_drvdata(dev);

	hanwang->irq->dev = hanwang->usbdev;
	if (usb_submit_urb(hanwang->irq, GFP_KERNEL))
	return -EIO;

	return 0;
	}

	static void hanwang_close(struct input_dev *dev)
	{
	struct hanwang *hanwang = input_get_drvdata(dev);

	usb_kill_urb(hanwang->irq);
	}

	static bool get_features(struct usb_device dev, struct hanwang hanwang)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(features_array); i++) {
	if (le16_to_cpu(dev->descriptor.idProduct) ==
	features_array[i].pid) {
	hanwang->features = &features_array[i];
	return true;
	}
	}

	return false;
	}


	static int hanwang_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 hanwang *hanwang;
	struct input_dev *input_dev;
	int error;
	int i;

	if (intf->cur_altsetting->desc.bNumEndpoints < 1)
	return -ENODEV;

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

	if (!get_features(dev, hanwang)) {
	error = -ENXIO;
	goto fail1;
	}

	hanwang->data = usb_alloc_coherent(dev, hanwang->features->pkg_len,
	GFP_KERNEL, &hanwang->data_dma);
	if (!hanwang->data) {
	error = -ENOMEM;
	goto fail1;
	}

	hanwang->irq = usb_alloc_urb(0, GFP_KERNEL);
	if (!hanwang->irq) {
	error = -ENOMEM;
	goto fail2;
	}

	hanwang->usbdev = dev;
	hanwang->dev = input_dev;

	usb_make_path(dev, hanwang->phys, sizeof(hanwang->phys));
	strlcat(hanwang->phys, "/input0", sizeof(hanwang->phys));

	strscpy(hanwang->name, hanwang->features->name, sizeof(hanwang->name));
	input_dev->name = hanwang->name;
	input_dev->phys = hanwang->phys;
	usb_to_input_id(dev, &input_dev->id);
	input_dev->dev.parent = &intf->dev;

	input_set_drvdata(input_dev, hanwang);

	input_dev->open = hanwang_open;
	input_dev->close = hanwang_close;

	for (i = 0; i < ARRAY_SIZE(hw_eventtypes); ++i)
	__set_bit(hw_eventtypes[i], input_dev->evbit);

	for (i = 0; i < ARRAY_SIZE(hw_absevents); ++i)
	__set_bit(hw_absevents[i], input_dev->absbit);

	for (i = 0; i < ARRAY_SIZE(hw_btnevents); ++i)
	__set_bit(hw_btnevents[i], input_dev->keybit);

	for (i = 0; i < ARRAY_SIZE(hw_mscevents); ++i)
	__set_bit(hw_mscevents[i], input_dev->mscbit);

	input_set_abs_params(input_dev, ABS_X,
	0, hanwang->features->max_x, 4, 0);
	input_set_abs_params(input_dev, ABS_Y,
	0, hanwang->features->max_y, 4, 0);
	input_set_abs_params(input_dev, ABS_TILT_X,
	0, hanwang->features->max_tilt_x, 0, 0);
	input_set_abs_params(input_dev, ABS_TILT_Y,
	0, hanwang->features->max_tilt_y, 0, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE,
	0, hanwang->features->max_pressure, 0, 0);

	endpoint = &intf->cur_altsetting->endpoint[0].desc;
	usb_fill_int_urb(hanwang->irq, dev,
	usb_rcvintpipe(dev, endpoint->bEndpointAddress),
	hanwang->data, hanwang->features->pkg_len,
	hanwang_irq, hanwang, endpoint->bInterval);
	hanwang->irq->transfer_dma = hanwang->data_dma;
	hanwang->irq->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;

	error = input_register_device(hanwang->dev);
	if (error)
	goto fail3;

	usb_set_intfdata(intf, hanwang);

	return 0;

	fail3: usb_free_urb(hanwang->irq);
	fail2: usb_free_coherent(dev, hanwang->features->pkg_len,
	hanwang->data, hanwang->data_dma);
	fail1: input_free_device(input_dev);
	kfree(hanwang);
	return error;

	}

	static void hanwang_disconnect(struct usb_interface *intf)
	{
	struct hanwang *hanwang = usb_get_intfdata(intf);

	input_unregister_device(hanwang->dev);
	usb_free_urb(hanwang->irq);
	usb_free_coherent(interface_to_usbdev(intf),
	hanwang->features->pkg_len, hanwang->data,
	hanwang->data_dma);
	kfree(hanwang);
	usb_set_intfdata(intf, NULL);
	}

	static const struct usb_device_id hanwang_ids[] = {
	{ HANWANG_TABLET_DEVICE(USB_VENDOR_ID_HANWANG, HANWANG_TABLET_INT_CLASS,
	HANWANG_TABLET_INT_SUB_CLASS, HANWANG_TABLET_INT_PROTOCOL) },
	{}
	};

	MODULE_DEVICE_TABLE(usb, hanwang_ids);

	static struct usb_driver hanwang_driver = {
	.name = "hanwang",
	.probe = hanwang_probe,
	.disconnect = hanwang_disconnect,
	.id_table = hanwang_ids,
	};

	module_usb_driver(hanwang_driver);