[PATCH] Wacom Graphire Bluetooth driver

[Bastien Nocera <hadess-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org>]

>From 3495e3be72d1df6132d5f5d978d2def3e4d57fc3 Mon Sep 17 00:00:00 2001
From: Bastien Nocera <hadess-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org>
Date: Mon, 16 Mar 2009 23:36:54 +0000
Subject: [PATCH] Wacom Graphire Bluetooth driver

Signed-off-by: Bastien Nocera <hadess-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org>

Based on the work by Andrew Zabolotny, an HID driver for the Bluetooth
Wacom tablet. This is required as it uses a slightly different
protocols from what's currently support by the drivers/input/wacom*
driver, and those only support USB.

A user-space patch is required to activate mode 2 of the Wacom tablet,
as hidp does not support hid_output_raw_report.
---
 drivers/hid/Kconfig     |    7 ++
 drivers/hid/Makefile    |    1 +
 drivers/hid/hid-core.c  |    1 +
 drivers/hid/hid-ids.h   |    1 +
 drivers/hid/hid-wacom.c |  272 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 282 insertions(+), 0 deletions(-)
 create mode 100644 drivers/hid/hid-wacom.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index e85c8fe..f3244e3 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -261,6 +261,13 @@ config THRUSTMASTER_FF
 	  Say Y here if you have a THRUSTMASTER FireStore Dual Power 2 or
 	  a THRUSTMASTER Ferrari GT Rumble Force or Force Feedback Wheel.
 
+config HID_WACOM
+	tristate "Wacom Bluetooth devices support" if EMBEDDED
+	depends on BT_HIDP
+	default !EMBEDDED
+	---help---
+	Support for Wacom Graphire Bluetooth tablet.
+
 config ZEROPLUS_FF
 	tristate "Zeroplus based game controller support"
 	depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index fbd021f..410b302 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_GREENASIA_FF)	+= hid-gaff.o
 obj-$(CONFIG_THRUSTMASTER_FF)	+= hid-tmff.o
 obj-$(CONFIG_HID_TOPSEED)	+= hid-topseed.o
 obj-$(CONFIG_ZEROPLUS_FF)	+= hid-zpff.o
+obj-$(CONFIG_HID_WACOM)		+= hid-wacom.o
 
 obj-$(CONFIG_USB_HID)		+= usbhid/
 obj-$(CONFIG_USB_MOUSE)		+= usbhid/
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 1cc9674..d134f5d 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1305,6 +1305,7 @@ static const struct hid_device_id hid_blacklist[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb651) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb654) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPSEED, USB_DEVICE_ID_TOPSEED_CYBERLINK) },
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 8851197..e8f96c2 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -400,6 +400,7 @@
 #define USB_DEVICE_ID_VERNIER_LCSPEC	0x0006
 
 #define USB_VENDOR_ID_WACOM		0x056a
+#define USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH	0x81
 
 #define USB_VENDOR_ID_WISEGROUP		0x0925
 #define USB_DEVICE_ID_1_PHIDGETSERVO_20	0x8101
diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
new file mode 100644
index 0000000..8f9783f
--- /dev/null
+++ b/drivers/hid/hid-wacom.c
@@ -0,0 +1,272 @@
+/*
+ *  Bluetooth Wacom Tablet support
+ *
+ *  Copyright (c) 1999 Andreas Gal
+ *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech-AlSwsSmVLrQ@public.gmane.org>
+ *  Copyright (c) 2005 Michael Haboustak <mike--vDbLwGUA7lNWk0Htik3J/w@public.gmane.org> for Concept2, Inc
+ *  Copyright (c) 2006-2007 Jiri Kosina
+ *  Copyright (c) 2007 Paul Walmsley
+ *  Copyright (c) 2008 Jiri Slaby <jirislaby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *  Copyright (c) 2006 Andrew Zabolotny <zap-ez6wqqBRKvoox3rIn2DAYQ@public.gmane.org>
+ *  Copyright (c) 2009 Bastien Nocera <hadess-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org>
+ */
+
+/*
+ * 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 <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+struct wacom_data {
+	__u16 tool;
+	unsigned char butstate;
+};
+
+static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
+		u8 *raw_data, int size)
+{
+	struct wacom_data *wdata = hid_get_drvdata(hdev);
+	struct hid_input *hidinput;
+	struct input_dev *input;
+	unsigned char *data = (unsigned char *) raw_data;
+	int tool, x, y, rw, need_sync;
+
+	if (!(hdev->claimed & HID_CLAIMED_INPUT))
+		return 0;
+
+	tool = 0;
+	need_sync = 0;
+	hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
+	input = hidinput->input;
+
+	/* Check if this is a tablet report */
+	if (data[0] != 0x03)
+		return 0;
+
+	/* Get X & Y positions */
+	x = le16_to_cpu(*(__le16 *) &data[2]);
+	y = le16_to_cpu(*(__le16 *) &data[4]);
+
+	/* Get current tool identifier */
+	if (data[1] & 0x90) { /* If pen is in the in/active area */
+		switch ((data[1] >> 5) & 3) {
+		case 0:	/* Pen */
+			tool = BTN_TOOL_PEN;
+			break;
+
+		case 1: /* Rubber */
+			tool = BTN_TOOL_RUBBER;
+			break;
+
+		case 2: /* Mouse with wheel */
+		case 3: /* Mouse without wheel */
+			tool = BTN_TOOL_MOUSE;
+			break;
+		}
+
+		/* Reset tool if out of active tablet area */
+		if (!(data[1] & 0x10))
+			tool = 0;
+	}
+
+	/* If tool changed, notify input subsystem */
+	if (wdata->tool != tool) {
+		if (wdata->tool) {
+			/* Completely reset old tool state */
+			if (wdata->tool == BTN_TOOL_MOUSE) {
+				input_report_key(input, BTN_LEFT, 0);
+				input_report_key(input, BTN_RIGHT, 0);
+				input_report_key(input, BTN_MIDDLE, 0);
+				input_report_abs(input, ABS_DISTANCE,
+						input->absmax[ABS_DISTANCE]);
+			} else {
+				input_report_key(input, BTN_TOUCH, 0);
+				input_report_key(input, BTN_STYLUS, 0);
+				input_report_key(input, BTN_STYLUS2, 0);
+				input_report_abs(input, ABS_PRESSURE, 0);
+			}
+			input_sync(input);
+			input_report_key(input, wdata->tool, 0);
+			input_sync(input);
+		}
+		wdata->tool = tool;
+		if (tool) {
+			input_report_key(input, tool, 1);
+			need_sync = 1;
+		}
+	}
+
+	if (tool) {
+		input_report_abs(input, ABS_X, x);
+		input_report_abs(input, ABS_Y, y);
+		need_sync = 1;
+
+		switch ((data[1] >> 5) & 3) {
+		case 2: /* Mouse with wheel */
+			input_report_key(input, BTN_MIDDLE, data[1] & 0x04);
+			rw = (data[6] & 0x01) ? -1 :
+				(data[6] & 0x02) ? 1 : 0;
+			input_report_rel(input, REL_WHEEL, rw);
+			/* fall through */
+
+		case 3: /* Mouse without wheel */
+			input_report_key(input, BTN_LEFT, data[1] & 0x01);
+			input_report_key(input, BTN_RIGHT, data[1] & 0x02);
+			/* Compute distance between mouse and tablet */
+			rw = 44 - (data[6] >> 2);
+			if (rw < 0)
+				rw = 0;
+			else if (rw > 31)
+				rw = 31;
+			input_report_abs(input, ABS_DISTANCE, rw);
+			break;
+
+		default:
+			input_report_abs(input, ABS_PRESSURE,
+					data[6] | (((__u16) (data[1] & 0x08)) << 5));
+			input_report_key(input, BTN_TOUCH, data[1] & 0x01);
+			input_report_key(input, BTN_STYLUS, data[1] & 0x02);
+			input_report_key(input, BTN_STYLUS2, data[1] & 0x04);
+			break;
+		}
+	}
+
+	if (need_sync) {
+		input_sync(input);
+		need_sync = 0;
+	}
+
+	/* Report the state of the two buttons at the top of the tablet
+	 * as two extra fingerpad keys (buttons 4 & 5). */
+	rw = data[7] & 0x03;
+	if (rw != wdata->butstate) {
+		wdata->butstate = rw;
+		input_report_key(input, BTN_0, rw & 0x02);
+		input_report_key(input, BTN_1, rw & 0x01);
+		need_sync = 1;
+	}
+
+	if (need_sync) {
+		input_event(input, EV_MSC, MSC_SERIAL, 0xf0);
+		input_sync(input);
+	}
+
+	return 1;
+}
+
+static int wacom_probe(struct hid_device *hdev,
+		const struct hid_device_id *id)
+{
+	struct hid_input *hidinput;
+	struct input_dev *input;
+	struct wacom_data *wdata;
+	int ret;
+
+	wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
+	if (wdata == NULL) {
+		dev_err(&hdev->dev, "can't alloc wacom descriptor\n");
+		return -ENOMEM;
+	}
+
+	hid_set_drvdata(hdev, wdata);
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		dev_err(&hdev->dev, "parse failed\n");
+		goto err_free;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		dev_err(&hdev->dev, "hw start failed\n");
+		goto err_free;
+	}
+
+	hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
+	input = hidinput->input;
+
+	/* Basics */
+	input->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_REL);
+	input->absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) |
+		BIT(ABS_PRESSURE) | BIT(ABS_DISTANCE);
+	input->relbit[0] |= BIT(REL_WHEEL);
+	set_bit(BTN_TOOL_PEN, input->keybit);
+	set_bit(BTN_TOUCH, input->keybit);
+	set_bit(BTN_STYLUS, input->keybit);
+	set_bit(BTN_STYLUS2, input->keybit);
+	set_bit(BTN_LEFT, input->keybit);
+	set_bit(BTN_RIGHT, input->keybit);
+	set_bit(BTN_MIDDLE, input->keybit);
+
+	/* Pad */
+	input->evbit[0] |= BIT(EV_MSC);
+	input->mscbit[0] |= BIT(MSC_SERIAL);
+
+	/* Distance, rubber and mouse */
+	input->absbit[0] |= BIT(ABS_DISTANCE);
+	set_bit(BTN_TOOL_RUBBER, input->keybit);
+	set_bit(BTN_TOOL_MOUSE, input->keybit);
+
+	input->absmax[ABS_PRESSURE] = 511;
+	input->absmax[ABS_DISTANCE] = 32;
+
+	input->absmax[ABS_X] = 16704;
+	input->absmax[ABS_Y] = 12064;
+	input->absfuzz[ABS_X] = 4;
+	input->absfuzz[ABS_Y] = 4;
+
+	return 0;
+err_free:
+	kfree(wdata);
+	return ret;
+}
+
+static void wacom_remove(struct hid_device *hdev)
+{
+	hid_hw_stop(hdev);
+	kfree(hid_get_drvdata(hdev));
+}
+
+static const struct hid_device_id wacom_devices[] = {
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH) },
+
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, wacom_devices);
+
+static struct hid_driver wacom_driver = {
+	.name = "wacom",
+	.id_table = wacom_devices,
+	.probe = wacom_probe,
+	.remove = wacom_remove,
+	.raw_event = wacom_raw_event,
+};
+
+static int wacom_init(void)
+{
+	int ret;
+
+	ret = hid_register_driver(&wacom_driver);
+	if (ret)
+		printk(KERN_ERR "can't register wacom driver\n");
+	printk(KERN_ERR "wacom driver registered\n");
+	return ret;
+}
+
+static void wacom_exit(void)
+{
+	hid_unregister_driver(&wacom_driver);
+}
+
+module_init(wacom_init);
+module_exit(wacom_exit);
+MODULE_LICENSE("GPL");
+
+HID_COMPAT_LOAD_DRIVER(wacom);
-- 
1.6.2