Message-Id: <1215225067.2556.0.camel@alnilam>
Date:	Sat, 05 Jul 2008 04:31:07 +0200
From:	Henrik Rydberg <rydberg@...omail.se>
To:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmitry.torokhov@...il.com, robfitz@...k.net, akpm@...l.org,
	jikos@...os.cz, vojtech@...e.cz, dmonakhov@...nvz.org
Subject: [PATCH] linux-input: bcm5974-0.5: conformity, urb scrutinized

From: Henrik Rydberg <rydberg@...omail.se>

BCM5974: This driver adds support for the multitouch trackpad on the new
Apple Macbook Air and Macbook Pro Penryn laptops. It replaces the
appletouch driver on those computers, and integrates well with the
synaptics driver of the Xorg system. 

Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
---

This is version bcm5974-0.5, which is a light rewrite adressing the
comments of Andrew Morton. Regarding the GFP_ATOMIC, it is still present
in irq_button, irq_trackpad, and atp_open, based on the reasons given
in the previous post.

The driver hooks have been extended with reset_resume, pre_reset and post_reset.

diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 7bbea09..956cc4f 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -130,6 +130,29 @@ config MOUSE_APPLETOUCH
 	  To compile this driver as a module, choose M here: the
 	  module will be called appletouch.
 
+config MOUSE_BCM5974
+	tristate "Apple USB BCM5974 Multitouch trackpad support"
+	depends on USB_ARCH_HAS_HCD
+	depends on USB
+	help
+	  Say Y here if you have an Apple USB BCM5974 Multitouch
+	  trackpad.
+	  
+	  The BCM5974 is the multitouch trackpad found in the Macbook
+	  Air (JAN2008) and Macbook Pro Penryn (FEB2008) laptops.
+	  
+	  It is also found in the IPhone (2007) and Ipod Touch (2008).
+	  
+	  This driver provides multitouch functionality together with
+	  the synaptics X11 driver.
+	  
+	  The interface is currently identical to the appletouch interface,
+	  for further information, see
+	  <file:Documentation/input/appletouch.txt>.
+	  
+	  To compile this driver as a module, choose M here: the 
+	  module will be called bcm5974.
+
 config MOUSE_INPORT
 	tristate "InPort/MS/ATIXL busmouse"
 	depends on ISA
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index 9e6e363..d4d2025 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -6,6 +6,7 @@
 
 obj-$(CONFIG_MOUSE_AMIGA)	+= amimouse.o
 obj-$(CONFIG_MOUSE_APPLETOUCH)	+= appletouch.o
+obj-$(CONFIG_MOUSE_BCM5974)	+= bcm5974.o
 obj-$(CONFIG_MOUSE_ATARI)	+= atarimouse.o
 obj-$(CONFIG_MOUSE_RISCPC)	+= rpcmouse.o
 obj-$(CONFIG_MOUSE_INPORT)	+= inport.o
diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c
new file mode 100644
index 0000000..a7f070f
--- /dev/null
+++ b/drivers/input/mouse/bcm5974.c
@@ -0,0 +1,690 @@
+/*
+ * Apple USB BCM5974 (Macbook Air and Penryn Macbook Pro) multitouch driver
+ *
+ * Copyright (C) 2008	   Henrik Rydberg (rydberg@...omail.se)
+ *
+ * The USB initialization and package decoding was made by
+ * Scott Shawcroft as part of the touchd user-space driver project:
+ * Copyright (C) 2008	   Scott Shawcroft (scott.shawcroft@...il.com)
+ *
+ * The BCM5974 driver is based on the appletouch driver:
+ * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@...ah.com)
+ * Copyright (C) 2005      Johannes Berg (johannes@...solutions.net)
+ * Copyright (C) 2005	   Stelian Pop (stelian@...ies.net)
+ * Copyright (C) 2005	   Frank Arnold (frank@...rocco-5v-turbo.de)
+ * Copyright (C) 2005	   Peter Osterlund (petero2@...ia.com)
+ * Copyright (C) 2005	   Michael Hanselmann (linux-kernel@...smi.ch)
+ * Copyright (C) 2006	   Nicolas Boichat (nicolas@...chat.ch)
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb/input.h>
+#include <linux/hid.h>
+
+#define APPLE_VENDOR_ID		0x05AC
+
+/* MacbookAir, aka wellspring */
+#define ATP_WELLSPRING_ANSI	0x0223
+#define ATP_WELLSPRING_ISO	0x0224
+#define ATP_WELLSPRING_JIS	0x0225
+/* MacbookProPenryn, aka wellspring2 */
+#define ATP_WELLSPRING2_ANSI	0x0230
+#define ATP_WELLSPRING2_ISO	0x0231
+#define ATP_WELLSPRING2_JIS	0x0232
+
+#define ATP_DEVICE(prod) {					\
+	.match_flags = (USB_DEVICE_ID_MATCH_DEVICE |		\
+			USB_DEVICE_ID_MATCH_INT_CLASS |		\
+			USB_DEVICE_ID_MATCH_INT_PROTOCOL),	\
+	.idVendor = APPLE_VENDOR_ID,				\
+	.idProduct = (prod),					\
+	.bInterfaceClass = USB_INTERFACE_CLASS_HID,		\
+	.bInterfaceProtocol = USB_INTERFACE_PROTOCOL_MOUSE	\
+}
+
+/* table of devices that work with this driver */
+static const struct usb_device_id atp_table [] = {
+	/* MacbookAir1.1 */
+	ATP_DEVICE(ATP_WELLSPRING_ANSI),
+	ATP_DEVICE(ATP_WELLSPRING_ISO),
+	ATP_DEVICE(ATP_WELLSPRING_JIS),
+	/* MacbookProPenryn */
+	ATP_DEVICE(ATP_WELLSPRING2_ANSI),
+	ATP_DEVICE(ATP_WELLSPRING2_ISO),
+	ATP_DEVICE(ATP_WELLSPRING2_JIS),
+	/* Terminating entry */
+	{}
+};
+MODULE_DEVICE_TABLE(usb, atp_table);
+
+MODULE_AUTHOR("Henrik Rydberg");
+MODULE_DESCRIPTION("Apple USB BCM5974 multitouch driver");
+MODULE_LICENSE("GPL");
+
+#define dprintk(level, format, a...)\
+	{ if (debug >= level) printk(KERN_DEBUG format, ##a); }
+
+static int debug = 1;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Activate debugging output");
+
+/* button data structure */
+struct bt_data {
+	u8 unknown1;		/* constant */
+	u8 button;		/* left button */
+	u8 rel_x;		/* relative x coordinate */
+	u8 rel_y;		/* relative y coordinate */
+};
+
+/* trackpad header structure */
+struct tp_header {
+	u8 unknown1[16];	/* constants, timers, etc */
+	u8 fingers;		/* number of fingers on trackpad */
+	u8 unknown2[9];		/* constants, timers, etc */
+};
+
+/* trackpad finger structure */
+struct tp_finger {
+	__le16 origin;		/* left/right origin? */
+	__le16 abs_x;		/* absolute x coodinate */
+	__le16 abs_y;		/* absolute y coodinate */
+	__le16 rel_x;		/* relative x coodinate */
+	__le16 rel_y;		/* relative y coodinate */
+	__le16 size_major;	/* finger size, major axis? */
+	__le16 size_minor;	/* finger size, minor axis? */
+	__le16 orientation;	/* 16384 when point, else 15 bit angle */
+	__le16 force_major;	/* trackpad force, major axis? */
+	__le16 force_minor;	/* trackpad force, minor axis? */
+	__le16 unused[3];	/* zeros */
+	__le16 multi;		/* one finger: varies, more fingers: constant */
+};
+
+/* trackpad data structure, empirically at least ten fingers */
+struct tp_data {
+	struct tp_header header;
+	struct tp_finger finger[16];
+};
+
+/* device-specific parameters */
+struct atp_params {
+	int dim;		/* logical dimension */
+	int devmin;		/* device minimum reading */
+	int devmax;		/* device maximum reading */
+};
+
+/* device-specific configuration */
+struct atp_config {
+	int ansi, iso, jis;	/* the product id of this device */
+	int bt_ep;		/* the endpoint of the button interface */
+	int bt_datalen;		/* data length of the button interface */
+	int tp_ep;		/* the endpoint of the trackpad interface */
+	int tp_datalen;		/* data length of the trackpad interface */
+	struct atp_params p;	/* finger pressure limits */
+	struct atp_params w;	/* finger width limits */
+	struct atp_params x;	/* horizontal limits */
+	struct atp_params y;	/* vertical limits */
+};
+
+/* logical trackpad state */
+struct tp_state {
+	int pressure;		/* finger pressure value */
+	int width;		/* finger width value */
+	int abs_x;		/* absolute x coordinate */
+	int abs_y;		/* absolute y coordinate */
+	int fingers;		/* number of fingers on trackpad */
+};
+
+/* logical device structure */
+struct atp {
+	char phys[64];
+	struct usb_device *udev;	/* usb device */
+	struct input_dev *input;	/* input dev */
+	struct atp_config cfg;		/* device configuration */
+	int open;			/* >0: open, else closed */
+	int suspended;			/* >0: suspended, else open */
+	struct urb *bt_urb;		/* button usb request block */
+	struct bt_data *bt_data;	/* button transferred data */
+	unsigned bt_prev_state;		/* logical button previous state */
+	unsigned bt_state;		/* logical button state */
+	struct urb *tp_urb;		/* trackpad usb request block */
+	struct tp_data *tp_data;	/* trackpad transferred data */
+	struct tp_state tp_state;	/* logical trackpad state */
+	unsigned tp_valid;		/* trackpad sensors valid */
+};
+
+/* logical dimensions */
+#define DIM_PRESSURE	256		/* maximum finger pressure */
+#define DIM_WIDTH	16		/* maximum finger width */
+#define DIM_X		1280		/* maximum trackpad x value */
+#define DIM_Y		800		/* maximum trackpad y value */
+#define SNRATIO		50		/* signal to noise ratio */
+
+/* device constants */
+static const struct atp_config atp_config_table[] = {
+	{
+		ATP_WELLSPRING_ANSI,
+		ATP_WELLSPRING_ISO,
+		ATP_WELLSPRING_JIS,
+		0x84, sizeof(struct bt_data),
+		0x81, sizeof(struct tp_data),
+		{ DIM_PRESSURE, 0, 256 },
+		{ DIM_WIDTH, 0, 2048 },
+		{ DIM_X, -4824, 5342 },
+		{ DIM_Y, -172, 5820 }
+	},
+	{
+		ATP_WELLSPRING2_ANSI,
+		ATP_WELLSPRING2_ISO,
+		ATP_WELLSPRING2_JIS,
+		0x84, sizeof(struct bt_data),
+		0x81, sizeof(struct tp_data),
+		{ DIM_PRESSURE, 0, 256 },
+		{ DIM_WIDTH, 0, 2048 },
+		{ DIM_X, -4824, 5342 },
+		{ DIM_Y, -172, 5820 }
+	},
+	{}
+};
+
+/* return the device-specific configuration by device */
+static const struct atp_config *atp_product_config(struct usb_device *udev)
+{
+	u16 id = le16_to_cpu(udev->descriptor.idProduct);
+	const struct atp_config *config;
+	for (config = atp_config_table; config->ansi; ++config)
+		if (config->ansi == id || config->iso == id ||
+				config->jis == id)
+			return config;
+	return atp_config_table;
+}
+
+/* convert 16-bit little endian to signed integer */
+static inline int raw2int(__le16 x)
+{
+	return (signed short)le16_to_cpu(x);
+}
+
+/* scale device data to logical dimensions (asserts devmin < devmax) */
+static inline int int2scale(const struct atp_params *p, int x)
+{
+	return x * p->dim / (p->devmax - p->devmin);
+}
+
+/* all logical value ranges are [0,dim). */
+static inline int int2bound(const struct atp_params *p, int x)
+{
+	int s = int2scale(p, x);
+	return s < 0 ? 0 : s >= p->dim ? p->dim - 1 : s;
+}
+
+/* convert button data to logical button state */
+static int compute_bt_state(struct atp *dev, int size)
+{
+	if (size != sizeof(struct bt_data))
+		return -EIO;
+
+	dev->bt_prev_state = dev->bt_state;
+	dev->bt_state = dev->bt_data->button;
+
+	return 0;
+}
+
+/* convert trackpad data to logical trackpad state */
+static int compute_tp_state(struct atp *dev, int size)
+{
+	const struct atp_config *c = &dev->cfg;
+	const struct tp_finger *f = dev->tp_data->finger;
+	const int fingers = (size - 26) / 28;
+	struct tp_state *s = &dev->tp_state;
+
+	if (size < 26 || (size - 26) % 28 != 0)
+		return -EIO;
+
+	if (!fingers) {
+		s->pressure = 0;
+		s->fingers = 0;
+		return 0;
+	}
+
+	dprintk(9, "bcm5974: p: %+05d w: %+05d x: %+05d y: %+05d f: %d\n",
+		raw2int(f->force_major), raw2int(f->size_major),
+		raw2int(f->abs_x), raw2int(f->abs_y), fingers);
+
+	s->pressure = int2bound(&c->p, raw2int(f->force_major));
+	s->width = int2bound(&c->w, raw2int(f->size_major));
+	s->abs_x = int2bound(&c->x, raw2int(f->abs_x) - c->x.devmin);
+	s->abs_y = int2bound(&c->y, c->y.devmax - raw2int(f->abs_y));
+	s->fingers = s->pressure > 0 ? fingers : 0;
+
+	return 0;
+}
+
+/* Wellspring initialization constants */
+#define ATP_WELLSPRING_MODE_READ_REQUEST_ID	1
+#define ATP_WELLSPRING_MODE_WRITE_REQUEST_ID	9
+#define ATP_WELLSPRING_MODE_REQUEST_VALUE	0x300
+#define ATP_WELLSPRING_MODE_REQUEST_INDEX	0
+#define ATP_WELLSPRING_MODE_VENDOR_VALUE_1	0x01
+#define ATP_WELLSPRING_MODE_VENDOR_VALUE_2	0x05
+
+static int atp_wellspring_init(struct atp *dev)
+{
+	char *data = kmalloc(8, GFP_KERNEL);
+	int error = 0, size;
+
+	if (!data) {
+		err("bcm5974: out of memory");
+		error = -ENOMEM;
+		goto error;
+	}
+
+	/* reset button endpoint */
+	if (usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
+			USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
+			0, dev->cfg.bt_ep, NULL, 0, 5000)) {
+		err("bcm5974: could not reset button endpoint");
+		error = -EIO;
+		goto error;
+	}
+
+	/* reset trackpad endpoint */
+	if (usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
+			USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
+			0, dev->cfg.tp_ep, NULL, 0, 5000)) {
+		err("bcm5974: could not reset trackpad endpoint");
+		error = -EIO;
+		goto error;
+	}
+
+	/* read configuration */
+	size = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
+		ATP_WELLSPRING_MODE_READ_REQUEST_ID,
+		USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+		ATP_WELLSPRING_MODE_REQUEST_VALUE,
+		ATP_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
+
+	if (size != 8) {
+		err("bcm5974: could not read from device");
+		error = -EIO;
+		goto error;
+	}
+
+	/* apply the mode switch */
+	data[0] = ATP_WELLSPRING_MODE_VENDOR_VALUE_1;
+	data[1] = ATP_WELLSPRING_MODE_VENDOR_VALUE_2;
+
+	/* write configuration */
+	size = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
+		ATP_WELLSPRING_MODE_WRITE_REQUEST_ID,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+		ATP_WELLSPRING_MODE_REQUEST_VALUE,
+		ATP_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
+
+	if (size != 8) {
+		err("bcm5974: could not write to device");
+		error = -EIO;
+		goto error;
+	}
+
+	dev->tp_valid = 0;
+
+	printk(KERN_INFO "bcm5974: Wellspring mode initialized.\n");
+
+	kfree(data);
+	return 0;
+
+error:
+	kfree(data);
+	return error;
+}
+
+static void irq_button(struct urb *urb)
+{
+	struct atp *dev = urb->context;
+	int error;
+
+	switch (urb->status) {
+	case 0:
+		break;
+	case -EOVERFLOW:
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		dbg("bcm5974: button urb shutting down: %d", urb->status);
+		return;
+	default:
+		dbg("bcm5974: button urb status: %d", urb->status);
+		goto exit;
+	}
+
+	if (compute_bt_state(dev, dev->bt_urb->actual_length)) {
+		dprintk(1, "bcm5974: bad button package, length: %d)\n",
+			dev->bt_urb->actual_length);
+		goto exit;
+	}
+
+	/* only report button state changes */
+	if (dev->bt_state != dev->bt_prev_state) {
+		input_report_key(dev->input, BTN_LEFT, dev->bt_data->button);
+		input_sync(dev->input);
+	}
+
+exit:
+	error = usb_submit_urb(dev->bt_urb, GFP_ATOMIC);
+	if (error)
+		err("bcm5974: button urb failed: %d", error);
+}
+
+static void irq_trackpad(struct urb *urb)
+{
+	struct atp *dev = urb->context;
+	struct tp_state *state = &dev->tp_state;
+	int error;
+
+	switch (urb->status) {
+	case 0:
+		break;
+	case -EOVERFLOW:
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		dbg("bcm5974: trackpad urb shutting down: %d", urb->status);
+		return;
+	default:
+		dbg("bcm5974: trackpad urb status: %d", urb->status);
+		goto exit;
+	}
+
+	/* first sample data ignored */
+	if (!dev->tp_valid) {
+		dev->tp_valid = 1;
+		goto exit;
+	}
+
+	if (compute_tp_state(dev, dev->tp_urb->actual_length)) {
+		dprintk(1, "bcm5974: bad trackpad package, length: %d)\n",
+			dev->tp_urb->actual_length);
+		goto exit;
+	}
+
+	input_report_abs(dev->input, ABS_PRESSURE, state->pressure);
+	input_report_abs(dev->input, ABS_TOOL_WIDTH, state->width);
+	input_report_abs(dev->input, ABS_X, state->abs_x);
+	input_report_abs(dev->input, ABS_Y, state->abs_y);
+	input_report_key(dev->input, BTN_TOOL_FINGER, state->fingers == 1);
+	input_report_key(dev->input, BTN_TOOL_DOUBLETAP, state->fingers == 2);
+	input_report_key(dev->input, BTN_TOOL_TRIPLETAP, state->fingers > 2);
+	input_sync(dev->input);
+
+exit:
+	error = usb_submit_urb(dev->tp_urb, GFP_ATOMIC);
+	if (error)
+		err("bcm5974: trackpad urb failed: %d", error);
+}
+
+static int atp_open(struct input_dev *input)
+{
+	struct atp *dev = input_get_drvdata(input);
+
+	if (!dev->open) {
+		if (usb_submit_urb(dev->bt_urb, GFP_ATOMIC))
+			goto error;
+		if (usb_submit_urb(dev->tp_urb, GFP_ATOMIC))
+			goto err_free_bt_urb;
+	}
+
+	dev->open = 1;
+	dev->suspended = 0;
+	return 0;
+
+err_free_bt_urb:
+	usb_free_urb(dev->bt_urb);
+error:
+	return -EIO;
+}
+
+static void atp_close(struct input_dev *input)
+{
+	struct atp *dev = input_get_drvdata(input);
+
+	usb_kill_urb(dev->tp_urb);
+	usb_kill_urb(dev->bt_urb);
+
+	dev->open = 0;
+	dev->suspended = 0;
+}
+
+static int atp_probe(struct usb_interface *iface,
+		     const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(iface);
+	const struct atp_config *cfg;
+	struct atp *dev;
+	struct input_dev *input_dev;
+	int error = 0;
+
+	/* find the product index */
+	cfg = atp_product_config(udev);
+
+	/* allocate memory for our device state and initialize it */
+	dev = kzalloc(sizeof(struct atp), GFP_KERNEL);
+	input_dev = input_allocate_device();
+	if (!dev || !input_dev) {
+		err("bcm5974: out of memory");
+		error = -ENOMEM;
+		goto err_free_devs;
+	}
+
+	dev->udev = udev;
+	dev->input = input_dev;
+	dev->cfg = *cfg;
+
+	/* switch to raw sensor mode */
+	if (atp_wellspring_init(dev)) {
+		error = -EIO;
+		goto err_free_devs;
+	}
+
+	dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!dev->bt_urb) {
+		error = -ENOMEM;
+		goto err_free_devs;
+	}
+
+	dev->tp_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!dev->tp_urb) {
+		error = -ENOMEM;
+		goto err_free_bt_urb;
+	}
+
+	dev->bt_data = usb_buffer_alloc(dev->udev,
+		dev->cfg.bt_datalen, GFP_KERNEL,
+		&dev->bt_urb->transfer_dma);
+	if (!dev->bt_data) {
+		error = -ENOMEM;
+		goto err_free_urb;
+	}
+
+	dev->tp_data = usb_buffer_alloc(dev->udev,
+		dev->cfg.tp_datalen, GFP_KERNEL,
+		&dev->tp_urb->transfer_dma);
+	if (!dev->tp_data) {
+		error = -ENOMEM;
+		goto err_free_bt_buffer;
+	}
+
+	usb_fill_int_urb(dev->bt_urb, udev,
+		usb_rcvintpipe(udev, cfg->bt_ep),
+		dev->bt_data, dev->cfg.bt_datalen,
+		irq_button, dev, 1);
+
+	usb_fill_int_urb(dev->tp_urb, udev,
+		usb_rcvintpipe(udev, cfg->tp_ep),
+		dev->tp_data, dev->cfg.tp_datalen,
+		irq_trackpad, dev, 1);
+
+	usb_make_path(udev, dev->phys, sizeof(dev->phys));
+	strlcat(dev->phys, "/input0", sizeof(dev->phys));
+
+	input_dev->name = "bcm5974";
+	input_dev->phys = dev->phys;
+	usb_to_input_id(dev->udev, &input_dev->id);
+	input_dev->dev.parent = &iface->dev;
+
+	input_set_drvdata(input_dev, dev);
+
+	input_dev->open = atp_open;
+	input_dev->close = atp_close;
+
+	set_bit(EV_ABS, input_dev->evbit);
+	input_set_abs_params(input_dev, ABS_PRESSURE,
+		0, cfg->p.dim, cfg->p.dim / SNRATIO, 0);
+	input_set_abs_params(input_dev, ABS_TOOL_WIDTH,
+		0, cfg->w.dim, cfg->w.dim / SNRATIO, 0);
+	input_set_abs_params(input_dev, ABS_X,
+		0, cfg->x.dim, cfg->x.dim / SNRATIO, 0);
+	input_set_abs_params(input_dev, ABS_Y,
+		0, cfg->y.dim, cfg->y.dim / SNRATIO, 0);
+
+	set_bit(EV_KEY, input_dev->evbit);
+	set_bit(BTN_TOOL_FINGER, input_dev->keybit);
+	set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
+	set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
+	set_bit(BTN_LEFT, input_dev->keybit);
+
+	error = input_register_device(dev->input);
+	if (error)
+		goto err_free_buffer;
+
+	/* save our data pointer in this interface device */
+	usb_set_intfdata(iface, dev);
+
+	return 0;
+
+err_free_buffer:
+	usb_buffer_free(dev->udev, dev->cfg.tp_datalen,
+		dev->tp_data, dev->tp_urb->transfer_dma);
+err_free_bt_buffer:
+	usb_buffer_free(dev->udev, dev->cfg.bt_datalen,
+		dev->bt_data, dev->bt_urb->transfer_dma);
+err_free_urb:
+	usb_free_urb(dev->tp_urb);
+err_free_bt_urb:
+	usb_free_urb(dev->bt_urb);
+err_free_devs:
+	usb_set_intfdata(iface, NULL);
+	kfree(dev);
+	input_free_device(input_dev);
+	return error;
+}
+
+static void atp_disconnect(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	usb_set_intfdata(iface, NULL);
+
+	if (dev) {
+		input_unregister_device(dev->input);
+		usb_buffer_free(dev->udev, dev->cfg.tp_datalen,
+			dev->tp_data, dev->tp_urb->transfer_dma);
+		usb_buffer_free(dev->udev, dev->cfg.bt_datalen,
+			dev->bt_data, dev->bt_urb->transfer_dma);
+		usb_free_urb(dev->tp_urb);
+		usb_free_urb(dev->bt_urb);
+		kfree(dev);
+	}
+
+	printk(KERN_INFO "bcm5974: disconnected\n");
+}
+
+static int atp_suspend(struct usb_interface *iface, pm_message_t message)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	if (dev) {
+		if (!dev->suspended)
+			atp_close(dev->input);
+		dev->suspended++;
+	}
+
+	return 0;
+}
+
+static int atp_resume(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+	int error = 0;
+
+	if (dev && dev->suspended) {
+		if (!--dev->suspended)
+			error = atp_open(dev->input);
+	}
+
+	return error;
+}
+
+static int atp_reset_resume(struct usb_interface *iface)
+{
+	struct atp *dev = usb_get_intfdata(iface);
+
+	if (dev && atp_wellspring_init(dev))
+		printk(KERN_INFO "bcm5974: warning: reset failed\n");
+
+	return atp_resume(iface);
+}
+
+static int atp_pre_reset(struct usb_interface *iface)
+{
+	return atp_suspend(iface, PMSG_ON);
+}
+
+static int atp_post_reset(struct usb_interface *iface)
+{
+	return atp_reset_resume(iface);
+}
+
+static struct usb_driver atp_driver = {
+	.name = "bcm5974",
+	.probe = atp_probe,
+	.disconnect = atp_disconnect,
+	.suspend = atp_suspend,
+	.resume = atp_resume,
+	.reset_resume = atp_reset_resume,
+	.pre_reset = atp_pre_reset,
+	.post_reset = atp_post_reset,
+	.id_table = atp_table,
+};
+
+static int __init atp_init(void)
+{
+	return usb_register(&atp_driver);
+}
+
+static void __exit atp_exit(void)
+{
+	usb_deregister(&atp_driver);
+}
+
+module_init(atp_init);
+module_exit(atp_exit);
+
--
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