path: root/drivers/hid/hid-wacom.c

/*
 *  Bluetooth Wacom Tablet support
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 *  Copyright (c) 2008 Jiri Slaby <jirislaby@gmail.com>
 *  Copyright (c) 2006 Andrew Zabolotny <zap@homelink.ru>
 *  Copyright (c) 2009 Bastien Nocera <hadess@hadess.net>
 *  Copyright (c) 2011 Przemysław Firszt <przemo@firszt.eu>
 */

/*
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/power_supply.h>

#include "hid-ids.h"

#define PAD_DEVICE_ID	0x0F

#define WAC_CMD_LED_CONTROL     0x20
#define WAC_CMD_ICON_START_STOP     0x21
#define WAC_CMD_ICON_TRANSFER       0x26

struct wacom_data {
	__u16 tool;
	__u16 butstate;
	__u8 whlstate;
	__u8 features;
	__u32 id;
	__u32 serial;
	unsigned char high_speed;
	__u8 battery_capacity;
	__u8 power_raw;
	__u8 ps_connected;
	struct power_supply battery;
	struct power_supply ac;
	__u8 led_selector;
	struct led_classdev *leds[4];
};

/*percent of battery capacity for Graphire
  8th value means AC online and show 100% capacity */
static unsigned short batcap_gr[8] = { 1, 15, 25, 35, 50, 70, 100, 100 };
/*percent of battery capacity for Intuos4 WL, AC has a separate bit*/
static unsigned short batcap_i4[8] = { 1, 15, 30, 45, 60, 70, 85, 100 };

static enum power_supply_property wacom_battery_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_SCOPE,
};

static enum power_supply_property wacom_ac_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_SCOPE,
};

static void wacom_scramble(__u8 *image)
{
	__u16 mask;
	__u16 s1;
	__u16 s2;
	__u16 r1 ;
	__u16 r2 ;
	__u16 r;
	__u8 buf[256];
	int i, w, x, y, z;

	for (x = 0; x < 32; x++) {
		for (y = 0; y < 8; y++)
			buf[(8 * x) + (7 - y)] = image[(8 * x) + y];
	}

	/* Change 76543210 into GECA6420 as required by Intuos4 WL
	 *        HGFEDCBA      HFDB7531
	 */
	for (x = 0; x < 4; x++) {
		for (y = 0; y < 4; y++) {
			for (z = 0; z < 8; z++) {
				mask = 0x0001;
				r1 = 0;
				r2 = 0;
				i = (x << 6) + (y << 4) + z;
				s1 = buf[i];
				s2 = buf[i+8];
				for (w = 0; w < 8; w++) {
					r1 |= (s1 & mask);
					r2 |= (s2 & mask);
					s1 <<= 1;
					s2 <<= 1;
					mask <<= 2;
				}
				r = r1 | (r2 << 1);
				i = (x << 6) + (y << 4) + (z << 1);
				image[i] = 0xFF & r;
				image[i+1] = (0xFF00 & r) >> 8;
			}
		}
	}
}

static void wacom_set_image(struct hid_device *hdev, const char *image,
						__u8 icon_no)
{
	__u8 rep_data[68];
	__u8 p[256];
	int ret, i, j;

	for (i = 0; i < 256; i++)
		p[i] = image[i];

	rep_data[0] = WAC_CMD_ICON_START_STOP;
	rep_data[1] = 0;
	ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
				HID_FEATURE_REPORT);
	if (ret < 0)
		goto err;

	rep_data[0] = WAC_CMD_ICON_TRANSFER;
	rep_data[1] = icon_no & 0x07;

	wacom_scramble(p);

	for (i = 0; i <