path: root/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
#define WAC_MSG_RETRIES		5

#define WAC_CMD_LED_CONTROL	0x20
#define WAC_CMD_ICON_START	0x21
#define WAC_CMD_ICON_XFER	0x23
#define WAC_CMD_RETRIES		10

static int wacom_get_report(struct usb_interface *intf, u8 type, u8 id,
			    void *buf, size_t size, unsigned int retries)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	int retval;

	do {
		retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
				USB_REQ_GET_REPORT,
				USB_TYPE_CLASS | USB_RECIP_INTERFACE,
				(type << 8) + id,
				intf->altsetting[0].desc.bInterfaceNumber,
				buf, size, 100);
	} while ((retval == -ETIMEDOUT || retval == -EPIPE) && --retries);

	return retval;
}

static int wacom_set_report(struct usb_interface *intf, u8 type, u8 id,
			    void *buf, size_t size, unsigned int retries)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	int retval;

	do {
		retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_SET_REPORT,
				USB_TYPE_CLASS | USB_RECIP_INTERFACE,
				(type << 8) + id,
				intf->altsetting[0].desc.bInterfaceNumber,
				buf, size, 1000);
	} while ((retval == -ETIMEDOUT || retval == -EPIPE) && --retries);

	return retval;
}

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);
	usb_autopm_put_interface(wacom->intf);
	return retval;
}

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

	autopm_error = usb_autopm_get_interface(wacom->intf);

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

	if (!autopm_error)
		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