[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);

	mutex_lock(&wacom->lock);

	wacom->irq->dev = wacom->usbdev;

	if (usb_autopm_get_interface(wacom->intf) < 0) {
		mutex_unlock(&wacom->lock);
		return -EIO;
	}

	if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
		usb_autopm_put_interface(wacom->intf);
		mutex_unlock(&wacom->lock);
		return -EIO;
	}

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

	mutex_unlock(&wacom->lock);
	return 0;
}

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);
}

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