[net-next-2.6.git] / drivers / input / tablet / wacom_sys.c

/*
 * drivers/input/tablet/wacom_sys.c
 *
 *  USB Wacom tablet support - system specific code
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "wacom_wac.h"
#include "wacom.h"

/* defines to get HID report descriptor */
#define HID_DEVICET_HID		(USB_TYPE_CLASS | 0x01)
#define HID_DEVICET_REPORT	(USB_TYPE_CLASS | 0x02)
#define HID_USAGE_UNDEFINED		0x00
#define HID_USAGE_PAGE			0x05
#define HID_USAGE_PAGE_DIGITIZER	0x0d
#define HID_USAGE_PAGE_DESKTOP		0x01
#define HID_USAGE			0x09
#define HID_USAGE_X			0x30
#define HID_USAGE_Y			0x31
#define HID_USAGE_X_TILT		0x3d
#define HID_USAGE_Y_TILT		0x3e
#define HID_USAGE_FINGER		0x22
#define HID_USAGE_STYLUS		0x20
#define HID_COLLECTION			0xc0

enum {
	WCM_UNDEFINED = 0,
	WCM_DESKTOP,
	WCM_DIGITIZER,
};

struct hid_descriptor {
	struct usb_descriptor_header header;
	__le16   bcdHID;
	u8       bCountryCode;
	u8       bNumDescriptors;
	u8       bDescriptorType;
	__le16   wDescriptorLength;
} __attribute__ ((packed));

/* defines to get/set USB message */
#define USB_REQ_GET_REPORT	0x01
#define USB_REQ_SET_REPORT	0x09
#define WAC_HID_FEATURE_REPORT	0x03

static int usb_get_report(struct usb_interface *intf, unsigned char type,
				unsigned char id, void *buf, int size)
{
	return usb_control_msg(interface_to_usbdev(intf),
		usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
		USB_REQ_GET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		(type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
		buf, size, 100);
}

static int usb_set_report(struct usb_interface *intf, unsigned char type,
				unsigned char id, void *buf, int size)
{
	return usb_control_msg(interface_to_usbdev(intf),
		usb_sndctrlpipe(interface_to_usbdev(intf), 0),
                USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
		buf, size, 1000);
}

static void wacom_sys_irq(struct urb *urb)
{
	struct wacom *wacom = urb->context;
	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", __func__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d", __func__, urb->status);
		goto exit;
	}

	wacom_wac_irq(&wacom->wacom_wac, urb->actual_length);

 exit:
	usb_mark_last_busy(wacom->usbdev);
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		err ("%s - usb_submit_urb failed with result %d",
		     __func__, retval);
}

static int wacom_open(struct input_dev *dev)
{
	struct wacom *wacom = input_get_drvdata(dev);
	int retval = 0;

	if (usb_autopm_get_interface(wacom->intf) < 0)
		return -EIO;

	mutex_lock(&wacom->lock);

	if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
		retval = -EIO;
		goto out;
	}

	wacom->open = true;
	wacom->intf->needs_remote_wakeup = 1;

out:
	mutex_unlock(&wacom->lock);
	if (retval)
		usb_autopm_put_interface(wacom->intf);
	return retval;
}

static void wacom_close(struct input_dev *dev)
{
	struct wacom *wacom = input_get_drvdata(dev);

	mutex_lock(&wacom->lock);
	usb_kill_urb(wacom->irq);
	wacom->open = false;
	wacom->intf->needs_remote_wakeup = 0;
	mutex_unlock(&wacom->lock);

	usb_autopm_put_interface(wacom->intf);
}

static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,
			   struct wacom_features *features)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	char limit = 0;
	/* result has to be defined as int for some devices */
	int result = 0;
	int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
	unsigned char *report;

	report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
	if (!report)
		return -ENOMEM;

	/* retrive report descriptors */
	do {
		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_DESCRIPTOR,
			USB_RECIP_INTERFACE | USB_DIR_IN,
			HID_DEVICET_REPORT << 8,
			intf->altsetting[0].desc.bInterfaceNumber, /* interface */
			report,
			hid_desc->wDescriptorLength,
			5000); /* 5 secs */
	} while (result < 0 && limit++ < 5);

	/* No need to parse the Descriptor. It isn't an error though */
	if (result < 0)
		goto out;

	for (i = 0; i < hid_desc->wDescriptorLength; i++) {

		switch (report[i]) {
		case HID_USAGE_PAGE:
			switch (report[i + 1]) {
			case HID_USAGE_PAGE_DIGITIZER:
				usage = WCM_DIGITIZER;
				i++;
				break;

			case HID_USAGE_PAGE_DESKTOP:
				usage = WCM_DESKTOP;
				i++;
				break;
			}
			break;

		case HID_USAGE:
			switch (report[i + 1]) {
			case HID_USAGE_X:
				if (usage == WCM_DESKTOP) {
					if (finger) {
						features->device_type = BTN_TOOL_DOUBLETAP;
						if (features->type == TABLETPC2FG) {
							/* need to reset back */
							features->pktlen = WACOM_PKGLEN_TPC2FG;
							features->device_type = BTN_TOOL_TRIPLETAP;
						}
						features->x_max =
							get_unaligned_le16(&report[i + 3]);
						features->x_phy =
							get_unaligned_le16(&report[i + 6]);
						features->unit = report[i + 9];
						features->unitExpo = report[i + 11];
						i += 12;
					} else if (pen) {
						/* penabled only accepts exact bytes of data */
						if (features->type == TABLETPC2FG)
							features->pktlen = WACOM_PKGLEN_GRAPHIRE;
						features->device_type = BTN_TOOL_PEN;
						features->x_max =
							get_unaligned_le16(&report[i + 3]);
						i += 4;
					}
				} else if (usage == WCM_DIGITIZER) {
					/* max pressure isn't reported
					features->pressure_max = (unsigned short)
							(report[i+4] << 8  | report[i + 3]);
					*/
					features->pressure_max = 255;
					i += 4;
				}
				break;

			case HID_USAGE_Y:
				if (usage == WCM_DESKTOP) {
					if (finger) {
						features->device_type = BTN_TOOL_DOUBLETAP;
						if (features->type == TABLETPC2FG) {
							/* need to reset back */
							features->pktlen = WACOM_PKGLEN_TPC2FG;
							features->device_type = BTN_TOOL_TRIPLETAP;
							features->y_max =
								get_unaligned_le16(&report[i + 3]);
							features->y_phy =
								get_unaligned_le16(&report[i + 6]);
							i += 7;
						} else {
							features->y_max =
								features->x_max;
							features->y_phy =
								get_unaligned_le16(&report[i + 3]);
							i += 4;
						}
					} else if (pen) {
						/* penabled only accepts exact bytes of data */
						if (features->type == TABLETPC2FG)
							features->pktlen = WACOM_PKGLEN_GRAPHIRE;
						features->device_type = BTN_TOOL_PEN;
						features->y_max =
							get_unaligned_le16(&report[i + 3]);
						i += 4;
					}
				}
				break;

			case HID_USAGE_FINGER:
				finger = 1;
				i++;
				break;

			case HID_USAGE_STYLUS:
				pen = 1;
				i++;
				break;

			case HID_USAGE_UNDEFINED:
				if (usage == WCM_DESKTOP && finger) /* capacity */
					features->pressure_max =
						get_unaligned_le16(&report[i + 3]);
				i += 4;
				break;
			}
			break;

		case HID_COLLECTION:
			/* reset UsagePage and Finger */
			finger = usage = 0;
			break;
		}
	}

 out:
	result = 0;
	kfree(report);
	return result;
}

static int wacom_query_tablet_data(struct usb_interface *intf, struct wacom_features *features)
{
	unsigned char *rep_data;
	int limit = 0, report_id = 2;
	int error = -ENOMEM;

	rep_data = kmalloc(2, GFP_KERNEL);
	if (!rep_data)
		return error;

	/* ask to report tablet data if it is 2FGT or not a Tablet PC */
	if (features->device_type == BTN_TOOL_TRIPLETAP) {
		do {
			rep_data[0] = 3;
			rep_data[1] = 4;
			report_id = 3;
			error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
				report_id, rep_data, 2);
			if (error >= 0)
				error = usb_get_report(intf,
					WAC_HID_FEATURE_REPORT, report_id,
					rep_data, 3);
		} while ((error < 0 || rep_data[1] != 4) && limit++ < 5);
	} else if (features->type != TABLETPC && features->type != TABLETPC2FG) {
		do {
			rep_data[0] = 2;
			rep_data[1] = 2;
			error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
				report_id, rep_data, 2);
			if (error >= 0)
				error = usb_get_report(intf,
					WAC_HID_FEATURE_REPORT, report_id,
					rep_data, 2);
		} while ((error < 0 || rep_data[1] != 2) && limit++ < 5);
	}

	kfree(rep_data);

	return error < 0 ? error : 0;
}

static int wacom_retrieve_hid_descriptor(struct usb_interface *intf,
		struct wacom_features *features)
{
	int error = 0;
	struct usb_host_interface *interface = intf->cur_altsetting;
	struct hid_descriptor *hid_desc;

	/* default device to penabled */
	features->device_type = BTN_TOOL_PEN;

	/* only Tablet PCs need to retrieve the info */
	if ((features->type != TABLETPC) && (features->type != TABLETPC2FG))
		goto out;

	if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) {
		if (usb_get_extra_descriptor(&interface->endpoint[0],
				HID_DEVICET_REPORT, &hid_desc)) {
			printk("wacom: can not retrieve extra class descriptor\n");
			error = 1;
			goto out;
		}
	}
	error = wacom_parse_hid(intf, hid_desc, features);
	if (error)
		goto out;

	/* touch device found but size is not defined. use default */
	if (features->device_type == BTN_TOOL_DOUBLETAP && !features->x_max) {
		features->x_max = 1023;
		features->y_max = 1023;
	}

 out:
	return error;
}

struct wacom_usbdev_data {
	struct list_head list;
	struct kref kref;
	struct usb_device *dev;
	struct wacom_shared shared;
};

static LIST_HEAD(wacom_udev_list);
static DEFINE_MUTEX(wacom_udev_list_lock);

static struct wacom_usbdev_data *wacom_get_usbdev_data(struct usb_device *dev)
{
	struct wacom_usbdev_data *data;

	list_for_each_entry(data, &wacom_udev_list, list) {
		if (data->dev == dev) {
			kref_get(&data->kref);
			return data;
		}
	}

	return NULL;
}

static int wacom_add_shared_data(struct wacom_wac *wacom,
				 struct usb_device *dev)
{
	struct wacom_usbdev_data *data;
	int retval = 0;

	mutex_lock(&wacom_udev_list_lock);

	data = wacom_get_usbdev_data(dev);
	if (!data) {
		data = kzalloc(sizeof(struct wacom_usbdev_data), GFP_KERNEL);
		if (!data) {
			retval = -ENOMEM;
			goto out;
		}

		kref_init(&data->kref);
		data->dev = dev;
		list_add_tail(&data->list, &wacom_udev_list);
	}

	wacom->shared = &data->shared;

out:
	mutex_unlock(&wacom_udev_list_lock);
	return retval;
}

static void wacom_release_shared_data(struct kref *kref)
{
	struct wacom_usbdev_data *data =
		container_of(kref, struct wacom_usbdev_data, kref);

	mutex_lock(&wacom_udev_list_lock);
	list_del(&data->list);
	mutex_unlock(&wacom_udev_list_lock);

	kfree(data);
}

static void wacom_remove_shared_data(struct wacom_wac *wacom)
{
	struct wacom_usbdev_data *data;

	if (wacom->shared) {
		data = container_of(wacom->shared, struct wacom_usbdev_data, shared);
		kref_put(&data->kref, wacom_release_shared_data);
		wacom->shared = NULL;
	}
}

static int wacom_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 wacom *wacom;
	struct wacom_wac *wacom_wac;
	struct wacom_features *features;
	struct input_dev *input_dev;
	int error;

	if (!id->driver_info)
		return -EINVAL;

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

	wacom_wac = &wacom->wacom_wac;
	wacom_wac->features = *((struct wacom_features *)id->driver_info);
	features = &wacom_wac->features;
	if (features->pktlen > WACOM_PKGLEN_MAX) {
		error = -EINVAL;
		goto fail1;
	}

	wacom_wac->data = usb_alloc_coherent(dev, WACOM_PKGLEN_MAX,
					     GFP_KERNEL, &wacom->data_dma);
	if (!wacom_wac->data) {
		error = -ENOMEM;
		goto fail1;
	}

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

	wacom->usbdev = dev;
	wacom->intf = intf;
	mutex_init(&wacom->lock);
	usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
	strlcat(wacom->phys, "/input0", sizeof(wacom->phys));

	wacom_wac->input = input_dev;

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

	/* Retrieve the physical and logical size for OEM devices */
	error = wacom_retrieve_hid_descriptor(intf, features);
	if (error)
		goto fail2;

	strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));

	if (features->type == TABLETPC || features->type == TABLETPC2FG) {
		/* Append the device type to the name */
		strlcat(wacom_wac->name,
			features->device_type == BTN_TOOL_PEN ?
				" Pen" : " Finger",
			sizeof(wacom_wac->name));

		error = wacom_add_shared_data(wacom_wac, dev);
		if (error)
			goto fail3;
	}

	input_dev->name = wacom_wac->name;
	input_dev->dev.parent = &intf->dev;
	input_dev->open = wacom_open;
	input_dev->close = wacom_close;
	usb_to_input_id(dev, &input_dev->id);
	input_set_drvdata(input_dev, wacom);

	wacom_setup_input_capabilities(input_dev, wacom_wac);

	usb_fill_int_urb(wacom->irq, dev,
			 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
			 wacom_wac->data, features->pktlen,
			 wacom_sys_irq, wacom, endpoint->bInterval);
	wacom->irq->transfer_dma = wacom->data_dma;
	wacom->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	error = input_register_device(input_dev);
	if (error)
		goto fail4;

	/* Note that if query fails it is not a hard failure */
	wacom_query_tablet_data(intf, features);

	usb_set_intfdata(intf, wacom);
	return 0;

 fail4:	wacom_remove_shared_data(wacom_wac);
 fail3:	usb_free_urb(wacom->irq);
 fail2:	usb_free_coherent(dev, WACOM_PKGLEN_MAX, wacom_wac->data, wacom->data_dma);
 fail1:	input_free_device(input_dev);
	kfree(wacom);
	return error;
}

static void wacom_disconnect(struct usb_interface *intf)
{
	struct wacom *wacom = usb_get_intfdata(intf);

	usb_set_intfdata(intf, NULL);

	usb_kill_urb(wacom->irq);
	input_unregister_device(wacom->wacom_wac.input);
	usb_free_urb(wacom->irq);
	usb_free_coherent(interface_to_usbdev(intf), WACOM_PKGLEN_MAX,
			wacom->wacom_wac.data, wacom->data_dma);
	wacom_remove_shared_data(&wacom->wacom_wac);
	kfree(wacom);
}

static int wacom_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct wacom *wacom = usb_get_intfdata(intf);

	mutex_lock(&wacom->lock);
	usb_kill_urb(wacom->irq);
	mutex_unlock(&wacom->lock);

	return 0;
}

static int wacom_resume(struct usb_interface *intf)
{
	struct wacom *wacom = usb_get_intfdata(intf);
	struct wacom_features *features = &wacom->wacom_wac.features;
	int rv;

	mutex_lock(&wacom->lock);

	/* switch to wacom mode first */
	wacom_query_tablet_data(intf, features);

	if (wacom->open)
		rv = usb_submit_urb(wacom->irq, GFP_NOIO);
	else
		rv = 0;

	mutex_unlock(&wacom->lock);

	return rv;
}

static int wacom_reset_resume(struct usb_interface *intf)
{
	return wacom_resume(intf);
}

static struct usb_driver wacom_driver = {
	.name =		"wacom",
	.id_table =	wacom_ids,
	.probe =	wacom_probe,
	.disconnect =	wacom_disconnect,
	.suspend =	wacom_suspend,
	.resume =	wacom_resume,
	.reset_resume =	wacom_reset_resume,
	.supports_autosuspend = 1,
};

static int __init wacom_init(void)
{
	int result;

	result = usb_register(&wacom_driver);
	if (result == 0)
		printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
		       DRIVER_DESC "\n");
	return result;
}

static void __exit wacom_exit(void)
{
	usb_deregister(&wacom_driver);
}

module_init(wacom_init);
module_exit(wacom_exit);
Commit	Line	Data
3bea733a	1	/*
4104d13f	2	* drivers/input/tablet/wacom_sys.c
3bea733a	3	*
232f5693	4	* USB Wacom tablet support - system specific code
3bea733a PC	5	*/
	6
	7	/*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*/
	13
3bea733a	14	#include "wacom_wac.h"
51269fe8	15	#include "wacom.h"
3bea733a	16
545f4e99 PC	17	/* defines to get HID report descriptor */
	18	#define HID_DEVICET_HID (USB_TYPE_CLASS \| 0x01)
	19	#define HID_DEVICET_REPORT (USB_TYPE_CLASS \| 0x02)
	20	#define HID_USAGE_UNDEFINED 0x00
	21	#define HID_USAGE_PAGE 0x05
	22	#define HID_USAGE_PAGE_DIGITIZER 0x0d
	23	#define HID_USAGE_PAGE_DESKTOP 0x01
	24	#define HID_USAGE 0x09
	25	#define HID_USAGE_X 0x30
	26	#define HID_USAGE_Y 0x31
	27	#define HID_USAGE_X_TILT 0x3d
	28	#define HID_USAGE_Y_TILT 0x3e
	29	#define HID_USAGE_FINGER 0x22
	30	#define HID_USAGE_STYLUS 0x20
	31	#define HID_COLLECTION 0xc0
	32
	33	enum {
	34	WCM_UNDEFINED = 0,
	35	WCM_DESKTOP,
	36	WCM_DIGITIZER,
	37	};
	38
	39	struct hid_descriptor {
	40	struct usb_descriptor_header header;
	41	__le16 bcdHID;
	42	u8 bCountryCode;
	43	u8 bNumDescriptors;
	44	u8 bDescriptorType;
	45	__le16 wDescriptorLength;
	46	} __attribute__ ((packed));
	47
	48	/* defines to get/set USB message */
3bea733a PC	49	#define USB_REQ_GET_REPORT 0x01
3bea733a PC	50	#define USB_REQ_SET_REPORT 0x09
545f4e99	51	#define WAC_HID_FEATURE_REPORT 0x03
3bea733a PC	52
	53	static int usb_get_report(struct usb_interface *intf, unsigned char type,
	54	unsigned char id, void *buf, int size)
	55	{
	56	return usb_control_msg(interface_to_usbdev(intf),
	57	usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
	58	USB_REQ_GET_REPORT, USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	59	(type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
	60	buf, size, 100);
	61	}
	62
	63	static int usb_set_report(struct usb_interface *intf, unsigned char type,
	64	unsigned char id, void *buf, int size)
	65	{
	66	return usb_control_msg(interface_to_usbdev(intf),
	67	usb_sndctrlpipe(interface_to_usbdev(intf), 0),
	68	USB_REQ_SET_REPORT, USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	69	(type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
	70	buf, size, 1000);
	71	}
	72
54c9b226	73	static void wacom_sys_irq(struct urb *urb)
3bea733a PC	74	{
3bea733a PC	75	struct wacom *wacom = urb->context;
3bea733a PC	76	int retval;
	77
	78	switch (urb->status) {
	79	case 0:
	80	/* success */
	81	break;
	82	case -ECONNRESET:
	83	case -ENOENT:
	84	case -ESHUTDOWN:
	85	/* this urb is terminated, clean up */
ea3e6c59	86	dbg("%s - urb shutting down with status: %d", __func__, urb->status);
3bea733a PC	87	return;
3bea733a PC	88	default:
ea3e6c59	89	dbg("%s - nonzero urb status received: %d", __func__, urb->status);
3bea733a PC	90	goto exit;
	91	}
	92
95dd3b30	93	wacom_wac_irq(&wacom->wacom_wac, urb->actual_length);
3bea733a PC	94
3bea733a PC	95	exit:
e7224094	96	usb_mark_last_busy(wacom->usbdev);
73a97f4f	97	retval = usb_submit_urb(urb, GFP_ATOMIC);
3bea733a PC	98	if (retval)
3bea733a PC	99	err ("%s - usb_submit_urb failed with result %d",
ea3e6c59	100	__func__, retval);
3bea733a PC	101	}
3bea733a PC	102
3bea733a PC	103	static int wacom_open(struct input_dev *dev)
3bea733a PC	104	{
7791bdae	105	struct wacom *wacom = input_get_drvdata(dev);
f6cd3783	106	int retval = 0;
3bea733a	107
f6cd3783	108	if (usb_autopm_get_interface(wacom->intf) < 0)
3bea733a	109	return -EIO;
f6cd3783 DT	110
f6cd3783 DT	111	mutex_lock(&wacom->lock);
e7224094 ON	112
e7224094 ON	113	if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
f6cd3783 DT	114	retval = -EIO;
f6cd3783 DT	115	goto out;
e7224094 ON	116	}
e7224094 ON	117
51269fe8	118	wacom->open = true;
e7224094	119	wacom->intf->needs_remote_wakeup = 1;
3bea733a	120
f6cd3783	121	out:
e7224094	122	mutex_unlock(&wacom->lock);
f6cd3783 DT	123	if (retval)
	124	usb_autopm_put_interface(wacom->intf);
	125	return retval;
3bea733a PC	126	}
	127
	128	static void wacom_close(struct input_dev *dev)
	129	{
7791bdae	130	struct wacom *wacom = input_get_drvdata(dev);
3bea733a	131
e7224094	132	mutex_lock(&wacom->lock);
3bea733a	133	usb_kill_urb(wacom->irq);
51269fe8	134	wacom->open = false;
e7224094 ON	135	wacom->intf->needs_remote_wakeup = 0;
e7224094 ON	136	mutex_unlock(&wacom->lock);
f6cd3783 DT	137
f6cd3783 DT	138	usb_autopm_put_interface(wacom->intf);
3bea733a PC	139	}
3bea733a PC	140
545f4e99	141	static int wacom_parse_hid(struct usb_interface intf, struct hid_descriptor hid_desc,
ec67bbed	142	struct wacom_features *features)
545f4e99 PC	143	{
545f4e99 PC	144	struct usb_device *dev = interface_to_usbdev(intf);
ec67bbed PC	145	char limit = 0;
	146	/* result has to be defined as int for some devices */
	147	int result = 0;
545f4e99 PC	148	int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
	149	unsigned char *report;
	150
	151	report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
	152	if (!report)
	153	return -ENOMEM;
	154
	155	/* retrive report descriptors */
	156	do {
	157	result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
	158	USB_REQ_GET_DESCRIPTOR,
	159	USB_RECIP_INTERFACE \| USB_DIR_IN,
	160	HID_DEVICET_REPORT << 8,
	161	intf->altsetting[0].desc.bInterfaceNumber, /* interface */
	162	report,
	163	hid_desc->wDescriptorLength,
	164	5000); /* 5 secs */
	165	} while (result < 0 && limit++ < 5);
	166
384318ec	167	/* No need to parse the Descriptor. It isn't an error though */
545f4e99 PC	168	if (result < 0)
	169	goto out;
	170
	171	for (i = 0; i < hid_desc->wDescriptorLength; i++) {
	172
	173	switch (report[i]) {
	174	case HID_USAGE_PAGE:
	175	switch (report[i + 1]) {
	176	case HID_USAGE_PAGE_DIGITIZER:
	177	usage = WCM_DIGITIZER;
	178	i++;
	179	break;
	180
	181	case HID_USAGE_PAGE_DESKTOP:
	182	usage = WCM_DESKTOP;
	183	i++;
	184	break;
	185	}
	186	break;
	187
	188	case HID_USAGE:
	189	switch (report[i + 1]) {
	190	case HID_USAGE_X:
	191	if (usage == WCM_DESKTOP) {
	192	if (finger) {
ec67bbed PC	193	features->device_type = BTN_TOOL_DOUBLETAP;
	194	if (features->type == TABLETPC2FG) {
	195	/* need to reset back */
	196	features->pktlen = WACOM_PKGLEN_TPC2FG;
	197	features->device_type = BTN_TOOL_TRIPLETAP;
	198	}
545f4e99	199	features->x_max =
252f7769	200	get_unaligned_le16(&report[i + 3]);
ec67bbed	201	features->x_phy =
252f7769	202	get_unaligned_le16(&report[i + 6]);
ec67bbed PC	203	features->unit = report[i + 9];
	204	features->unitExpo = report[i + 11];
	205	i += 12;
545f4e99	206	} else if (pen) {
ec67bbed PC	207	/* penabled only accepts exact bytes of data */
ec67bbed PC	208	if (features->type == TABLETPC2FG)
57e413d9	209	features->pktlen = WACOM_PKGLEN_GRAPHIRE;
ec67bbed	210	features->device_type = BTN_TOOL_PEN;
545f4e99	211	features->x_max =
252f7769	212	get_unaligned_le16(&report[i + 3]);
545f4e99 PC	213	i += 4;
	214	}
	215	} else if (usage == WCM_DIGITIZER) {
	216	/* max pressure isn't reported
	217	features->pressure_max = (unsigned short)
	218	(report[i+4] << 8 \| report[i + 3]);
	219	*/
	220	features->pressure_max = 255;
	221	i += 4;
	222	}
	223	break;
	224
	225	case HID_USAGE_Y:
ec67bbed PC	226	if (usage == WCM_DESKTOP) {
	227	if (finger) {
	228	features->device_type = BTN_TOOL_DOUBLETAP;
	229	if (features->type == TABLETPC2FG) {
	230	/* need to reset back */
	231	features->pktlen = WACOM_PKGLEN_TPC2FG;
	232	features->device_type = BTN_TOOL_TRIPLETAP;
	233	features->y_max =
252f7769	234	get_unaligned_le16(&report[i + 3]);
ec67bbed	235	features->y_phy =
252f7769	236	get_unaligned_le16(&report[i + 6]);
ec67bbed PC	237	i += 7;
	238	} else {
	239	features->y_max =
	240	features->x_max;
	241	features->y_phy =
252f7769	242	get_unaligned_le16(&report[i + 3]);
ec67bbed PC	243	i += 4;
	244	}
	245	} else if (pen) {
	246	/* penabled only accepts exact bytes of data */
	247	if (features->type == TABLETPC2FG)
57e413d9	248	features->pktlen = WACOM_PKGLEN_GRAPHIRE;
ec67bbed PC	249	features->device_type = BTN_TOOL_PEN;
ec67bbed PC	250	features->y_max =
252f7769	251	get_unaligned_le16(&report[i + 3]);
ec67bbed PC	252	i += 4;
	253	}
	254	}
545f4e99 PC	255	break;
	256
	257	case HID_USAGE_FINGER:
	258	finger = 1;
	259	i++;
	260	break;
	261
	262	case HID_USAGE_STYLUS:
	263	pen = 1;
	264	i++;
	265	break;
	266
	267	case HID_USAGE_UNDEFINED:
	268	if (usage == WCM_DESKTOP && finger) /* capacity */
	269	features->pressure_max =
252f7769	270	get_unaligned_le16(&report[i + 3]);
545f4e99 PC	271	i += 4;
	272	break;
	273	}
	274	break;
	275
	276	case HID_COLLECTION:
ec67bbed	277	/* reset UsagePage and Finger */
545f4e99 PC	278	finger = usage = 0;
	279	break;
	280	}
	281	}
	282
545f4e99	283	out:
384318ec	284	result = 0;
545f4e99 PC	285	kfree(report);
	286	return result;
	287	}
	288
ec67bbed	289	static int wacom_query_tablet_data(struct usb_interface intf, struct wacom_features features)
3b7307c2 DT	290	{
3b7307c2 DT	291	unsigned char *rep_data;
ec67bbed PC	292	int limit = 0, report_id = 2;
ec67bbed PC	293	int error = -ENOMEM;
3b7307c2 DT	294
	295	rep_data = kmalloc(2, GFP_KERNEL);
	296	if (!rep_data)
ec67bbed PC	297	return error;
	298
	299	/* ask to report tablet data if it is 2FGT or not a Tablet PC */
	300	if (features->device_type == BTN_TOOL_TRIPLETAP) {
	301	do {
	302	rep_data[0] = 3;
	303	rep_data[1] = 4;
	304	report_id = 3;
	305	error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
	306	report_id, rep_data, 2);
	307	if (error >= 0)
	308	error = usb_get_report(intf,
	309	WAC_HID_FEATURE_REPORT, report_id,
	310	rep_data, 3);
	311	} while ((error < 0 \|\| rep_data[1] != 4) && limit++ < 5);
	312	} else if (features->type != TABLETPC && features->type != TABLETPC2FG) {
	313	do {
	314	rep_data[0] = 2;
	315	rep_data[1] = 2;
	316	error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
	317	report_id, rep_data, 2);
	318	if (error >= 0)
	319	error = usb_get_report(intf,
	320	WAC_HID_FEATURE_REPORT, report_id,
	321	rep_data, 2);
	322	} while ((error < 0 \|\| rep_data[1] != 2) && limit++ < 5);
	323	}
3b7307c2 DT	324
	325	kfree(rep_data);
	326
	327	return error < 0 ? error : 0;
	328	}
	329
ec67bbed PC	330	static int wacom_retrieve_hid_descriptor(struct usb_interface *intf,
	331	struct wacom_features *features)
	332	{
	333	int error = 0;
	334	struct usb_host_interface *interface = intf->cur_altsetting;
	335	struct hid_descriptor *hid_desc;
	336
	337	/* default device to penabled */
	338	features->device_type = BTN_TOOL_PEN;
	339
	340	/* only Tablet PCs need to retrieve the info */
	341	if ((features->type != TABLETPC) && (features->type != TABLETPC2FG))
	342	goto out;
	343
	344	if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) {
	345	if (usb_get_extra_descriptor(&interface->endpoint[0],
	346	HID_DEVICET_REPORT, &hid_desc)) {
	347	printk("wacom: can not retrieve extra class descriptor\n");
	348	error = 1;
	349	goto out;
	350	}
	351	}
	352	error = wacom_parse_hid(intf, hid_desc, features);
	353	if (error)
	354	goto out;
	355
	356	/* touch device found but size is not defined. use default */
	357	if (features->device_type == BTN_TOOL_DOUBLETAP && !features->x_max) {
	358	features->x_max = 1023;
	359	features->y_max = 1023;
	360	}
	361
	362	out:
	363	return error;
	364	}
	365
4492efff PC	366	struct wacom_usbdev_data {
	367	struct list_head list;
	368	struct kref kref;
	369	struct usb_device *dev;
	370	struct wacom_shared shared;
	371	};
	372
	373	static LIST_HEAD(wacom_udev_list);
	374	static DEFINE_MUTEX(wacom_udev_list_lock);
	375
	376	static struct wacom_usbdev_data wacom_get_usbdev_data(struct usb_device dev)
	377	{
	378	struct wacom_usbdev_data *data;
	379
	380	list_for_each_entry(data, &wacom_udev_list, list) {
	381	if (data->dev == dev) {
	382	kref_get(&data->kref);
	383	return data;
	384	}
	385	}
	386
	387	return NULL;
	388	}
	389
	390	static int wacom_add_shared_data(struct wacom_wac *wacom,
	391	struct usb_device *dev)
	392	{
	393	struct wacom_usbdev_data *data;
	394	int retval = 0;
	395
	396	mutex_lock(&wacom_udev_list_lock);
	397
	398	data = wacom_get_usbdev_data(dev);
	399	if (!data) {
	400	data = kzalloc(sizeof(struct wacom_usbdev_data), GFP_KERNEL);
	401	if (!data) {
	402	retval = -ENOMEM;
	403	goto out;
	404	}
	405
	406	kref_init(&data->kref);
	407	data->dev = dev;
	408	list_add_tail(&data->list, &wacom_udev_list);
	409	}
	410
	411	wacom->shared = &data->shared;
	412
	413	out:
	414	mutex_unlock(&wacom_udev_list_lock);
	415	return retval;
	416	}
	417
	418	static void wacom_release_shared_data(struct kref *kref)
	419	{
	420	struct wacom_usbdev_data *data =
	421	container_of(kref, struct wacom_usbdev_data, kref);
	422
	423	mutex_lock(&wacom_udev_list_lock);
	424	list_del(&data->list);
	425	mutex_unlock(&wacom_udev_list_lock);
	426
	427	kfree(data);
	428	}
	429
430	static void wacom_remove_shared_data(struct wacom_wac *wacom)
431	{
432	struct wacom_usbdev_data *data;
433
434	if (wacom->shared) {
435	data = container_of(wacom->shared, struct wacom_usbdev_data, shared);
436	kref_put(&data->kref, wacom_release_shared_data);
437	wacom->shared = NULL;
438	}
439	}
440
3bea733a PC	441	static int wacom_probe(struct usb_interface intf, const struct usb_device_id id)
	442	{
	443	struct usb_device *dev = interface_to_usbdev(intf);
	444	struct usb_endpoint_descriptor *endpoint;
	445	struct wacom *wacom;
	446	struct wacom_wac *wacom_wac;
e33da8a5	447	struct wacom_features *features;
3bea733a	448	struct input_dev *input_dev;
e33da8a5	449	int error;
3bea733a	450
e33da8a5	451	if (!id->driver_info)
b036f6fb BB	452	return -EINVAL;
b036f6fb BB	453
3bea733a	454	wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
3bea733a	455	input_dev = input_allocate_device();
51269fe8	456	if (!wacom \|\| !input_dev) {
e33da8a5 JC	457	error = -ENOMEM;
	458	goto fail1;
	459	}
	460
51269fe8	461	wacom_wac = &wacom->wacom_wac;
e33da8a5 JC	462	wacom_wac->features = ((struct wacom_features )id->driver_info);
	463	features = &wacom_wac->features;
	464	if (features->pktlen > WACOM_PKGLEN_MAX) {
	465	error = -EINVAL;
3bea733a	466	goto fail1;
e33da8a5	467	}
3bea733a	468
997ea58e DM	469	wacom_wac->data = usb_alloc_coherent(dev, WACOM_PKGLEN_MAX,
997ea58e DM	470	GFP_KERNEL, &wacom->data_dma);
e33da8a5 JC	471	if (!wacom_wac->data) {
e33da8a5 JC	472	error = -ENOMEM;
3bea733a	473	goto fail1;
e33da8a5	474	}
3bea733a PC	475
3bea733a PC	476	wacom->irq = usb_alloc_urb(0, GFP_KERNEL);
e33da8a5 JC	477	if (!wacom->irq) {
e33da8a5 JC	478	error = -ENOMEM;
3bea733a	479	goto fail2;
e33da8a5	480	}
3bea733a PC	481
3bea733a PC	482	wacom->usbdev = dev;
e7224094 ON	483	wacom->intf = intf;
e7224094 ON	484	mutex_init(&wacom->lock);
3bea733a PC	485	usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
	486	strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
	487
8da23fc1	488	wacom_wac->input = input_dev;
3bea733a	489
545f4e99 PC	490	endpoint = &intf->cur_altsetting->endpoint[0].desc;
545f4e99 PC	491
ec67bbed PC	492	/* Retrieve the physical and logical size for OEM devices */
	493	error = wacom_retrieve_hid_descriptor(intf, features);
	494	if (error)
	495	goto fail2;
545f4e99	496
49b764ae PC	497	strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));
	498
	499	if (features->type == TABLETPC \|\| features->type == TABLETPC2FG) {
	500	/* Append the device type to the name */
	501	strlcat(wacom_wac->name,
	502	features->device_type == BTN_TOOL_PEN ?
	503	" Pen" : " Finger",
	504	sizeof(wacom_wac->name));
4492efff PC	505
	506	error = wacom_add_shared_data(wacom_wac, dev);
	507	if (error)
	508	goto fail3;
49b764ae PC	509	}
49b764ae PC	510
8da23fc1 DT	511	input_dev->name = wacom_wac->name;
	512	input_dev->dev.parent = &intf->dev;
	513	input_dev->open = wacom_open;
	514	input_dev->close = wacom_close;
	515	usb_to_input_id(dev, &input_dev->id);
	516	input_set_drvdata(input_dev, wacom);
e33da8a5	517
8da23fc1	518	wacom_setup_input_capabilities(input_dev, wacom_wac);
3bea733a	519
3bea733a PC	520	usb_fill_int_urb(wacom->irq, dev,
3bea733a PC	521	usb_rcvintpipe(dev, endpoint->bEndpointAddress),
ec67bbed	522	wacom_wac->data, features->pktlen,
8d32e3ae	523	wacom_sys_irq, wacom, endpoint->bInterval);
3bea733a PC	524	wacom->irq->transfer_dma = wacom->data_dma;
	525	wacom->irq->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	526
8da23fc1	527	error = input_register_device(input_dev);
5014186d	528	if (error)
4492efff	529	goto fail4;
3bea733a	530
ec67bbed PC	531	/* Note that if query fails it is not a hard failure */
ec67bbed PC	532	wacom_query_tablet_data(intf, features);
3bea733a PC	533
	534	usb_set_intfdata(intf, wacom);
	535	return 0;
	536
4492efff	537	fail4: wacom_remove_shared_data(wacom_wac);
5014186d	538	fail3: usb_free_urb(wacom->irq);
997ea58e	539	fail2: usb_free_coherent(dev, WACOM_PKGLEN_MAX, wacom_wac->data, wacom->data_dma);
5014186d	540	fail1: input_free_device(input_dev);
3bea733a	541	kfree(wacom);
5014186d	542	return error;
3bea733a PC	543	}
	544
	545	static void wacom_disconnect(struct usb_interface *intf)
	546	{
e7224094	547	struct wacom *wacom = usb_get_intfdata(intf);
3bea733a PC	548
3bea733a PC	549	usb_set_intfdata(intf, NULL);
e7224094 ON	550
e7224094 ON	551	usb_kill_urb(wacom->irq);
8da23fc1	552	input_unregister_device(wacom->wacom_wac.input);
e7224094	553	usb_free_urb(wacom->irq);
997ea58e	554	usb_free_coherent(interface_to_usbdev(intf), WACOM_PKGLEN_MAX,
51269fe8 DT	555	wacom->wacom_wac.data, wacom->data_dma);
51269fe8 DT	556	wacom_remove_shared_data(&wacom->wacom_wac);
e7224094 ON	557	kfree(wacom);
	558	}
	559
	560	static int wacom_suspend(struct usb_interface *intf, pm_message_t message)
	561	{
	562	struct wacom *wacom = usb_get_intfdata(intf);
	563
	564	mutex_lock(&wacom->lock);
	565	usb_kill_urb(wacom->irq);
	566	mutex_unlock(&wacom->lock);
	567
	568	return 0;
	569	}
	570
	571	static int wacom_resume(struct usb_interface *intf)
	572	{
	573	struct wacom *wacom = usb_get_intfdata(intf);
51269fe8	574	struct wacom_features *features = &wacom->wacom_wac.features;
e7224094 ON	575	int rv;
	576
	577	mutex_lock(&wacom->lock);
38101475 PC	578
	579	/* switch to wacom mode first */
	580	wacom_query_tablet_data(intf, features);
	581
	582	if (wacom->open)
e7224094	583	rv = usb_submit_urb(wacom->irq, GFP_NOIO);
38101475	584	else
e7224094	585	rv = 0;
38101475	586
e7224094 ON	587	mutex_unlock(&wacom->lock);
	588
	589	return rv;
	590	}
	591
	592	static int wacom_reset_resume(struct usb_interface *intf)
	593	{
	594	return wacom_resume(intf);
3bea733a PC	595	}
	596
	597	static struct usb_driver wacom_driver = {
	598	.name = "wacom",
b036f6fb	599	.id_table = wacom_ids,
3bea733a PC	600	.probe = wacom_probe,
3bea733a PC	601	.disconnect = wacom_disconnect,
e7224094 ON	602	.suspend = wacom_suspend,
	603	.resume = wacom_resume,
	604	.reset_resume = wacom_reset_resume,
	605	.supports_autosuspend = 1,
3bea733a PC	606	};
	607
	608	static int __init wacom_init(void)
	609	{
	610	int result;
b036f6fb	611
3bea733a PC	612	result = usb_register(&wacom_driver);
3bea733a PC	613	if (result == 0)
899ef6e7 GKH	614	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
899ef6e7 GKH	615	DRIVER_DESC "\n");
3bea733a PC	616	return result;
	617	}
	618
	619	static void __exit wacom_exit(void)
	620	{
	621	usb_deregister(&wacom_driver);
	622	}
	623
	624	module_init(wacom_init);
	625	module_exit(wacom_exit);