[net-next-2.6.git] / drivers / usb / input / appletouch.c

/*
 * Apple USB Touchpad (for post-February 2005 PowerBooks) driver
 *
 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2005      Johannes Berg (johannes@sipsolutions.net)
 * Copyright (C) 2005      Stelian Pop (stelian@popies.net)
 * Copyright (C) 2005      Frank Arnold (frank@scirocco-5v-turbo.de)
 * Copyright (C) 2005      Peter Osterlund (petero2@telia.com)
 *
 * Thanks to Alex Harper <basilisk@foobox.net> for his inputs.
 *
 * 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/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/input.h>
#include <linux/usb_input.h>

/* Apple has powerbooks which have the keyboard with different Product IDs */
#define APPLE_VENDOR_ID		0x05AC

#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 = 0x03,				\
	.bInterfaceProtocol = 0x02

/* table of devices that work with this driver */
static struct usb_device_id atp_table [] = {
	{ ATP_DEVICE(0x020E) },
	{ ATP_DEVICE(0x020F) },
	{ ATP_DEVICE(0x030A) },
	{ ATP_DEVICE(0x030B) },
	{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, atp_table);

/* size of a USB urb transfer */
#define ATP_DATASIZE	81

/*
 * number of sensors. Note that only 16 instead of 26 X (horizontal)
 * sensors exist on 12" and 15" PowerBooks. All models have 16 Y
 * (vertical) sensors.
 */
#define ATP_XSENSORS	26
#define ATP_YSENSORS	16

/* amount of fuzz this touchpad generates */
#define ATP_FUZZ	16

/* maximum pressure this driver will report */
#define ATP_PRESSURE	300
/*
 * multiplication factor for the X and Y coordinates.
 * We try to keep the touchpad aspect ratio while still doing only simple
 * arithmetics.
 * The factors below give coordinates like:
 *	0 <= x <  960 on 12" and 15" Powerbooks
 *	0 <= x < 1600 on 17" Powerbooks
 *	0 <= y <  646
 */
#define ATP_XFACT	64
#define ATP_YFACT	43

/*
 * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is
 * ignored.
 */
#define ATP_THRESHOLD	 5

/* Structure to hold all of our device specific stuff */
struct atp {
	char			phys[64];
	struct usb_device *	udev;		/* usb device */
	struct urb *		urb;		/* usb request block */
	signed char *		data;		/* transferred data */
	int			open;		/* non-zero if opened */
	struct input_dev	*input;		/* input dev */
	int			valid;		/* are the sensors valid ? */
	int			x_old;		/* last reported x/y, */
	int			y_old;		/* used for smoothing */
						/* current value of the sensors */
	signed char		xy_cur[ATP_XSENSORS + ATP_YSENSORS];
						/* last value of the sensors */
	signed char		xy_old[ATP_XSENSORS + ATP_YSENSORS];
						/* accumulated sensors */
	int			xy_acc[ATP_XSENSORS + ATP_YSENSORS];
};

#define dbg_dump(msg, tab) \
	if (debug > 1) {						\
		int i;							\
		printk("appletouch: %s %lld", msg, (long long)jiffies); \
		for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++)	\
			printk(" %02x", tab[i]);			\
		printk("\n");						\
	}

#define dprintk(format, a...)						\
	do {								\
		if (debug) printk(format, ##a);				\
	} while (0)

MODULE_AUTHOR("Johannes Berg, Stelian Pop, Frank Arnold");
MODULE_DESCRIPTION("Apple PowerBooks USB touchpad driver");
MODULE_LICENSE("GPL");

static int debug = 1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activate debugging output");

static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
			     int *z, int *fingers)
{
	int i;
	/* values to calculate mean */
	int pcum = 0, psum = 0;

	*fingers = 0;

	for (i = 0; i < nb_sensors; i++) {
		if (xy_sensors[i] < ATP_THRESHOLD)
			continue;
		if ((i - 1 < 0) || (xy_sensors[i - 1] < ATP_THRESHOLD))
			(*fingers)++;
		pcum += xy_sensors[i] * i;
		psum += xy_sensors[i];
	}

	if (psum > 0) {
		*z = psum;
		return pcum * fact / psum;
	}

	return 0;
}

static inline void atp_report_fingers(struct input_dev *input, int fingers)
{
	input_report_key(input, BTN_TOOL_FINGER, fingers == 1);
	input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2);
	input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
}

static void atp_complete(struct urb* urb, struct pt_regs* regs)
{
	int x, y, x_z, y_z, x_f, y_f;
	int retval, i;
	struct atp *dev = urb->context;

	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",
		    __FUNCTION__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d",
		    __FUNCTION__, urb->status);
		goto exit;
	}

	/* drop incomplete datasets */
	if (dev->urb->actual_length != ATP_DATASIZE) {
		dprintk("appletouch: incomplete data package.\n");
		goto exit;
	}

	/* reorder the sensors values */
	for (i = 0; i < 8; i++) {
		/* X values */
		dev->xy_cur[i     ] = dev->data[5 * i +  2];
		dev->xy_cur[i +  8] = dev->data[5 * i +  4];
		dev->xy_cur[i + 16] = dev->data[5 * i + 42];
		if (i < 2)
			dev->xy_cur[i + 24] = dev->data[5 * i + 44];

		/* Y values */
		dev->xy_cur[i + 26] = dev->data[5 * i +  1];
		dev->xy_cur[i + 34] = dev->data[5 * i +  3];
	}

	dbg_dump("sample", dev->xy_cur);

	if (!dev->valid) {
		/* first sample */
		dev->valid = 1;
		dev->x_old = dev->y_old = -1;
		memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));

		/* 17" Powerbooks have 10 extra X sensors */
		for (i = 16; i < ATP_XSENSORS; i++)
			if (dev->xy_cur[i]) {
				printk("appletouch: 17\" model detected.\n");
				input_set_abs_params(dev->input, ABS_X, 0,
						     (ATP_XSENSORS - 1) *
						     ATP_XFACT - 1,
						     ATP_FUZZ, 0);
				break;
			}

		goto exit;
	}

	for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
		/* accumulate the change */
		signed char change = dev->xy_old[i] - dev->xy_cur[i];
		dev->xy_acc[i] -= change;

		/* prevent down drifting */
		if (dev->xy_acc[i] < 0)
			dev->xy_acc[i] = 0;
	}

	memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));

	dbg_dump("accumulator", dev->xy_acc);

	x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
			      ATP_XFACT, &x_z, &x_f);
	y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
			      ATP_YFACT, &y_z, &y_f);

	if (x && y) {
		if (dev->x_old != -1) {
			x = (dev->x_old * 3 + x) >> 2;
			y = (dev->y_old * 3 + y) >> 2;
			dev->x_old = x;
			dev->y_old = y;

			if (debug > 1)
				printk("appletouch: X: %3d Y: %3d "
				       "Xz: %3d Yz: %3d\n",
				       x, y, x_z, y_z);

			input_report_key(dev->input, BTN_TOUCH, 1);
			input_report_abs(dev->input, ABS_X, x);
			input_report_abs(dev->input, ABS_Y, y);
			input_report_abs(dev->input, ABS_PRESSURE,
					 min(ATP_PRESSURE, x_z + y_z));
			atp_report_fingers(dev->input, max(x_f, y_f));
		}
		dev->x_old = x;
		dev->y_old = y;
	}
	else if (!x && !y) {

		dev->x_old = dev->y_old = -1;
		input_report_key(dev->input, BTN_TOUCH, 0);
		input_report_abs(dev->input, ABS_PRESSURE, 0);
		atp_report_fingers(dev->input, 0);

		/* reset the accumulator on release */
		memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
	}

	input_report_key(dev->input, BTN_LEFT, !!dev->data[80]);

	input_sync(dev->input);

exit:
	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
	if (retval) {
		err("%s - usb_submit_urb failed with result %d",
		    __FUNCTION__, retval);
	}
}

static int atp_open(struct input_dev *input)
{
	struct atp *dev = input->private;

	if (usb_submit_urb(dev->urb, GFP_ATOMIC))
		return -EIO;

	dev->open = 1;
	return 0;
}

static void atp_close(struct input_dev *input)
{
	struct atp *dev = input->private;

	usb_kill_urb(dev->urb);
	dev->open = 0;
}

static int atp_probe(struct usb_interface *iface, const struct usb_device_id *id)
{
	struct atp *dev;
	struct input_dev *input_dev;
	struct usb_device *udev = interface_to_usbdev(iface);
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	int int_in_endpointAddr = 0;
	int i, retval = -ENOMEM;


	/* set up the endpoint information */
	/* use only the first interrupt-in endpoint */
	iface_desc = iface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
		endpoint = &iface_desc->endpoint[i].desc;
		if (!int_in_endpointAddr &&
		    (endpoint->bEndpointAddress & USB_DIR_IN) &&
		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
					== USB_ENDPOINT_XFER_INT)) {
			/* we found an interrupt in endpoint */
			int_in_endpointAddr = endpoint->bEndpointAddress;
			break;
		}
	}
	if (!int_in_endpointAddr) {
		err("Could not find int-in endpoint");
		return -EIO;
	}

	/* 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("Out of memory");
		goto err_free_devs;
	}

	dev->udev = udev;
	dev->input = input_dev;

	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->urb) {
		retval = -ENOMEM;
		goto err_free_devs;
	}

	dev->data = usb_buffer_alloc(dev->udev, ATP_DATASIZE, GFP_KERNEL,
				     &dev->urb->transfer_dma);
	if (!dev->data) {
		retval = -ENOMEM;
		goto err_free_urb;
	}

	usb_fill_int_urb(dev->urb, udev,
			 usb_rcvintpipe(udev, int_in_endpointAddr),
			 dev->data, ATP_DATASIZE, atp_complete, dev, 1);

	usb_make_path(udev, dev->phys, sizeof(dev->phys));
	strlcat(dev->phys, "/input0", sizeof(dev->phys));

	input_dev->name = "appletouch";
	input_dev->phys = dev->phys;
	usb_to_input_id(dev->udev, &input_dev->id);
	input_dev->cdev.dev = &iface->dev;

	input_dev->private = dev;
	input_dev->open = atp_open;
	input_dev->close = atp_close;

	set_bit(EV_ABS, input_dev->evbit);

	/*
	 * 12" and 15" Powerbooks only have 16 x sensors,
	 * 17" models are detected later.
	 */
	input_set_abs_params(input_dev, ABS_X, 0,
			     (16 - 1) * ATP_XFACT - 1, ATP_FUZZ, 0);
	input_set_abs_params(input_dev, ABS_Y, 0,
			     (ATP_YSENSORS - 1) * ATP_YFACT - 1, ATP_FUZZ, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0);

	set_bit(EV_KEY, input_dev->evbit);
	set_bit(BTN_TOUCH, input_dev->keybit);
	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);

	input_register_device(dev->input);

	/* save our data pointer in this interface device */
	usb_set_intfdata(iface, dev);

	return 0;

 err_free_urb:
	usb_free_urb(dev->urb);
 err_free_devs:
	usb_set_intfdata(iface, NULL);
	kfree(dev);
	input_free_device(input_dev);
	return retval;
}

static void atp_disconnect(struct usb_interface *iface)
{
	struct atp *dev = usb_get_intfdata(iface);

	usb_set_intfdata(iface, NULL);
	if (dev) {
		usb_kill_urb(dev->urb);
		input_unregister_device(dev->input);
		usb_free_urb(dev->urb);
		usb_buffer_free(dev->udev, ATP_DATASIZE,
				dev->data, dev->urb->transfer_dma);
		kfree(dev);
	}
	printk(KERN_INFO "input: appletouch disconnected\n");
}

static int atp_suspend(struct usb_interface *iface, pm_message_t message)
{
	struct atp *dev = usb_get_intfdata(iface);
	usb_kill_urb(dev->urb);
	dev->valid = 0;
	return 0;
}

static int atp_resume(struct usb_interface *iface)
{
	struct atp *dev = usb_get_intfdata(iface);
	if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
		return -EIO;

	return 0;
}

static struct usb_driver atp_driver = {
	.owner		= THIS_MODULE,
	.name		= "appletouch",
	.probe		= atp_probe,
	.disconnect	= atp_disconnect,
	.suspend	= atp_suspend,
	.resume		= atp_resume,
	.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);
Commit	Line	Data
f7214ff4 SP	1	/*
	2	* Apple USB Touchpad (for post-February 2005 PowerBooks) driver
	3	*
	4	* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
	5	* Copyright (C) 2005 Johannes Berg (johannes@sipsolutions.net)
	6	* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
	7	* Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de)
	8	* Copyright (C) 2005 Peter Osterlund (petero2@telia.com)
	9	*
	10	* Thanks to Alex Harper <basilisk@foobox.net> for his inputs.
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	25	*
	26	*/
	27
	28	#include <linux/config.h>
	29	#include <linux/kernel.h>
	30	#include <linux/errno.h>
	31	#include <linux/init.h>
	32	#include <linux/slab.h>
	33	#include <linux/module.h>
	34	#include <linux/usb.h>
	35	#include <linux/input.h>
	36	#include <linux/usb_input.h>
	37
	38	/* Apple has powerbooks which have the keyboard with different Product IDs */
	39	#define APPLE_VENDOR_ID 0x05AC
	40
	41	#define ATP_DEVICE(prod) \
c5b7c7c3	42	.match_flags = USB_DEVICE_ID_MATCH_DEVICE \| \
f7214ff4 SP	43	USB_DEVICE_ID_MATCH_INT_CLASS \| \
	44	USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
	45	.idVendor = APPLE_VENDOR_ID, \
	46	.idProduct = (prod), \
	47	.bInterfaceClass = 0x03, \
	48	.bInterfaceProtocol = 0x02
	49
	50	/* table of devices that work with this driver */
	51	static struct usb_device_id atp_table [] = {
	52	{ ATP_DEVICE(0x020E) },
	53	{ ATP_DEVICE(0x020F) },
	54	{ ATP_DEVICE(0x030A) },
	55	{ ATP_DEVICE(0x030B) },
	56	{ } /* Terminating entry */
	57	};
	58	MODULE_DEVICE_TABLE (usb, atp_table);
	59
	60	/* size of a USB urb transfer */
	61	#define ATP_DATASIZE 81
	62
	63	/*
	64	* number of sensors. Note that only 16 instead of 26 X (horizontal)
	65	* sensors exist on 12" and 15" PowerBooks. All models have 16 Y
	66	* (vertical) sensors.
	67	*/
	68	#define ATP_XSENSORS 26
	69	#define ATP_YSENSORS 16
	70
	71	/* amount of fuzz this touchpad generates */
	72	#define ATP_FUZZ 16
	73
	74	/* maximum pressure this driver will report */
	75	#define ATP_PRESSURE 300
	76	/*
	77	* multiplication factor for the X and Y coordinates.
	78	* We try to keep the touchpad aspect ratio while still doing only simple
	79	* arithmetics.
	80	* The factors below give coordinates like:
c5b7c7c3 DT	81	* 0 <= x < 960 on 12" and 15" Powerbooks
	82	* 0 <= x < 1600 on 17" Powerbooks
	83	* 0 <= y < 646
f7214ff4 SP	84	*/
	85	#define ATP_XFACT 64
	86	#define ATP_YFACT 43
	87
	88	/*
	89	* Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is
	90	* ignored.
	91	*/
	92	#define ATP_THRESHOLD 5
	93
	94	/* Structure to hold all of our device specific stuff */
	95	struct atp {
c5b7c7c3	96	char phys[64];
f7214ff4 SP	97	struct usb_device * udev; /* usb device */
	98	struct urb * urb; /* usb request block */
	99	signed char * data; /* transferred data */
	100	int open; /* non-zero if opened */
c5b7c7c3	101	struct input_dev input; / input dev */
f7214ff4 SP	102	int valid; /* are the sensors valid ? */
	103	int x_old; /* last reported x/y, */
	104	int y_old; /* used for smoothing */
	105	/* current value of the sensors */
	106	signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS];
	107	/* last value of the sensors */
	108	signed char xy_old[ATP_XSENSORS + ATP_YSENSORS];
	109	/* accumulated sensors */
	110	int xy_acc[ATP_XSENSORS + ATP_YSENSORS];
	111	};
	112
	113	#define dbg_dump(msg, tab) \
	114	if (debug > 1) { \
	115	int i; \
	116	printk("appletouch: %s %lld", msg, (long long)jiffies); \
	117	for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) \
c5b7c7c3 DT	118	printk(" %02x", tab[i]); \
c5b7c7c3 DT	119	printk("\n"); \
f7214ff4 SP	120	}
f7214ff4 SP	121
c5b7c7c3	122	#define dprintk(format, a...) \
f7214ff4 SP	123	do { \
	124	if (debug) printk(format, ##a); \
	125	} while (0)
	126
	127	MODULE_AUTHOR("Johannes Berg, Stelian Pop, Frank Arnold");
	128	MODULE_DESCRIPTION("Apple PowerBooks USB touchpad driver");
	129	MODULE_LICENSE("GPL");
	130
	131	static int debug = 1;
	132	module_param(debug, int, 0644);
	133	MODULE_PARM_DESC(debug, "Activate debugging output");
	134
	135	static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
	136	int z, int fingers)
	137	{
	138	int i;
	139	/* values to calculate mean */
	140	int pcum = 0, psum = 0;
	141
	142	*fingers = 0;
	143
	144	for (i = 0; i < nb_sensors; i++) {
	145	if (xy_sensors[i] < ATP_THRESHOLD)
	146	continue;
	147	if ((i - 1 < 0) \|\| (xy_sensors[i - 1] < ATP_THRESHOLD))
	148	(*fingers)++;
	149	pcum += xy_sensors[i] * i;
	150	psum += xy_sensors[i];
	151	}
	152
	153	if (psum > 0) {
	154	*z = psum;
	155	return pcum * fact / psum;
	156	}
	157
	158	return 0;
	159	}
	160
	161	static inline void atp_report_fingers(struct input_dev *input, int fingers)
	162	{
	163	input_report_key(input, BTN_TOOL_FINGER, fingers == 1);
	164	input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2);
	165	input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
	166	}
	167
	168	static void atp_complete(struct urb* urb, struct pt_regs* regs)
	169	{
	170	int x, y, x_z, y_z, x_f, y_f;
	171	int retval, i;
	172	struct atp *dev = urb->context;
	173
	174	switch (urb->status) {
	175	case 0:
	176	/* success */
	177	break;
	178	case -ECONNRESET:
	179	case -ENOENT:
	180	case -ESHUTDOWN:
	181	/* This urb is terminated, clean up */
	182	dbg("%s - urb shutting down with status: %d",
	183	__FUNCTION__, urb->status);
	184	return;
	185	default:
	186	dbg("%s - nonzero urb status received: %d",
187	__FUNCTION__, urb->status);
188	goto exit;
189	}
190
191	/* drop incomplete datasets */
192	if (dev->urb->actual_length != ATP_DATASIZE) {
193	dprintk("appletouch: incomplete data package.\n");
194	goto exit;
195	}
196
197	/* reorder the sensors values */
198	for (i = 0; i < 8; i++) {
199	/* X values */
200	dev->xy_cur[i ] = dev->data[5 * i + 2];
201	dev->xy_cur[i + 8] = dev->data[5 * i + 4];
202	dev->xy_cur[i + 16] = dev->data[5 * i + 42];
203	if (i < 2)
204	dev->xy_cur[i + 24] = dev->data[5 * i + 44];
205
206	/* Y values */
207	dev->xy_cur[i + 26] = dev->data[5 * i + 1];
208	dev->xy_cur[i + 34] = dev->data[5 * i + 3];
209	}
210
211	dbg_dump("sample", dev->xy_cur);
212
213	if (!dev->valid) {
214	/* first sample */
215	dev->valid = 1;
216	dev->x_old = dev->y_old = -1;
217	memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
218
219	/* 17" Powerbooks have 10 extra X sensors */
220	for (i = 16; i < ATP_XSENSORS; i++)
221	if (dev->xy_cur[i]) {
222	printk("appletouch: 17\" model detected.\n");
c5b7c7c3 DT	223	input_set_abs_params(dev->input, ABS_X, 0,
c5b7c7c3 DT	224	(ATP_XSENSORS - 1) *
f7214ff4 SP	225	ATP_XFACT - 1,
	226	ATP_FUZZ, 0);
	227	break;
	228	}
	229
	230	goto exit;
	231	}
	232
	233	for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
	234	/* accumulate the change */
	235	signed char change = dev->xy_old[i] - dev->xy_cur[i];
	236	dev->xy_acc[i] -= change;
	237
	238	/* prevent down drifting */
	239	if (dev->xy_acc[i] < 0)
	240	dev->xy_acc[i] = 0;
	241	}
	242
	243	memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
	244
	245	dbg_dump("accumulator", dev->xy_acc);
	246
	247	x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
	248	ATP_XFACT, &x_z, &x_f);
	249	y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
	250	ATP_YFACT, &y_z, &y_f);
	251
	252	if (x && y) {
	253	if (dev->x_old != -1) {
	254	x = (dev->x_old * 3 + x) >> 2;
	255	y = (dev->y_old * 3 + y) >> 2;
	256	dev->x_old = x;
	257	dev->y_old = y;
	258
	259	if (debug > 1)
	260	printk("appletouch: X: %3d Y: %3d "
	261	"Xz: %3d Yz: %3d\n",
	262	x, y, x_z, y_z);
	263
c5b7c7c3 DT	264	input_report_key(dev->input, BTN_TOUCH, 1);
	265	input_report_abs(dev->input, ABS_X, x);
	266	input_report_abs(dev->input, ABS_Y, y);
	267	input_report_abs(dev->input, ABS_PRESSURE,
f7214ff4	268	min(ATP_PRESSURE, x_z + y_z));
c5b7c7c3	269	atp_report_fingers(dev->input, max(x_f, y_f));
f7214ff4 SP	270	}
	271	dev->x_old = x;
	272	dev->y_old = y;
	273	}
	274	else if (!x && !y) {
	275
	276	dev->x_old = dev->y_old = -1;
c5b7c7c3 DT	277	input_report_key(dev->input, BTN_TOUCH, 0);
	278	input_report_abs(dev->input, ABS_PRESSURE, 0);
	279	atp_report_fingers(dev->input, 0);
f7214ff4 SP	280
	281	/* reset the accumulator on release */
	282	memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
	283	}
	284
c5b7c7c3	285	input_report_key(dev->input, BTN_LEFT, !!dev->data[80]);
f7214ff4	286
c5b7c7c3	287	input_sync(dev->input);
f7214ff4 SP	288
	289	exit:
	290	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
	291	if (retval) {
	292	err("%s - usb_submit_urb failed with result %d",
	293	__FUNCTION__, retval);
	294	}
	295	}
	296
	297	static int atp_open(struct input_dev *input)
	298	{
	299	struct atp *dev = input->private;
	300
	301	if (usb_submit_urb(dev->urb, GFP_ATOMIC))
	302	return -EIO;
	303
	304	dev->open = 1;
	305	return 0;
	306	}
	307
	308	static void atp_close(struct input_dev *input)
	309	{
	310	struct atp *dev = input->private;
	311
	312	usb_kill_urb(dev->urb);
	313	dev->open = 0;
	314	}
	315
	316	static int atp_probe(struct usb_interface iface, const struct usb_device_id id)
	317	{
c5b7c7c3 DT	318	struct atp *dev;
	319	struct input_dev *input_dev;
	320	struct usb_device *udev = interface_to_usbdev(iface);
f7214ff4 SP	321	struct usb_host_interface *iface_desc;
	322	struct usb_endpoint_descriptor *endpoint;
	323	int int_in_endpointAddr = 0;
	324	int i, retval = -ENOMEM;
	325
f7214ff4 SP	326
	327	/* set up the endpoint information */
	328	/* use only the first interrupt-in endpoint */
	329	iface_desc = iface->cur_altsetting;
	330	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
	331	endpoint = &iface_desc->endpoint[i].desc;
	332	if (!int_in_endpointAddr &&
	333	(endpoint->bEndpointAddress & USB_DIR_IN) &&
	334	((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
	335	== USB_ENDPOINT_XFER_INT)) {
	336	/* we found an interrupt in endpoint */
	337	int_in_endpointAddr = endpoint->bEndpointAddress;
	338	break;
	339	}
	340	}
	341	if (!int_in_endpointAddr) {
f7214ff4	342	err("Could not find int-in endpoint");
c5b7c7c3	343	return -EIO;
f7214ff4 SP	344	}
f7214ff4 SP	345
c5b7c7c3 DT	346	/* allocate memory for our device state and initialize it */
	347	dev = kzalloc(sizeof(struct atp), GFP_KERNEL);
	348	input_dev = input_allocate_device();
	349	if (!dev \|\| !input_dev) {
	350	err("Out of memory");
	351	goto err_free_devs;
	352	}
	353
	354	dev->udev = udev;
	355	dev->input = input_dev;
f7214ff4 SP	356
	357	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
	358	if (!dev->urb) {
	359	retval = -ENOMEM;
c5b7c7c3	360	goto err_free_devs;
f7214ff4	361	}
c5b7c7c3	362
f7214ff4 SP	363	dev->data = usb_buffer_alloc(dev->udev, ATP_DATASIZE, GFP_KERNEL,
	364	&dev->urb->transfer_dma);
	365	if (!dev->data) {
	366	retval = -ENOMEM;
c5b7c7c3	367	goto err_free_urb;
f7214ff4	368	}
c5b7c7c3 DT	369
	370	usb_fill_int_urb(dev->urb, udev,
	371	usb_rcvintpipe(udev, int_in_endpointAddr),
f7214ff4 SP	372	dev->data, ATP_DATASIZE, atp_complete, dev, 1);
f7214ff4 SP	373
c5b7c7c3 DT	374	usb_make_path(udev, dev->phys, sizeof(dev->phys));
	375	strlcat(dev->phys, "/input0", sizeof(dev->phys));
	376
	377	input_dev->name = "appletouch";
	378	input_dev->phys = dev->phys;
	379	usb_to_input_id(dev->udev, &input_dev->id);
	380	input_dev->cdev.dev = &iface->dev;
f7214ff4	381
c5b7c7c3 DT	382	input_dev->private = dev;
	383	input_dev->open = atp_open;
	384	input_dev->close = atp_close;
f7214ff4	385
c5b7c7c3	386	set_bit(EV_ABS, input_dev->evbit);
f7214ff4 SP	387
	388	/*
	389	* 12" and 15" Powerbooks only have 16 x sensors,
	390	* 17" models are detected later.
	391	*/
c5b7c7c3	392	input_set_abs_params(input_dev, ABS_X, 0,
f7214ff4	393	(16 - 1) * ATP_XFACT - 1, ATP_FUZZ, 0);
c5b7c7c3	394	input_set_abs_params(input_dev, ABS_Y, 0,
f7214ff4	395	(ATP_YSENSORS - 1) * ATP_YFACT - 1, ATP_FUZZ, 0);
c5b7c7c3	396	input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0);
f7214ff4	397
c5b7c7c3 DT	398	set_bit(EV_KEY, input_dev->evbit);
	399	set_bit(BTN_TOUCH, input_dev->keybit);
	400	set_bit(BTN_TOOL_FINGER, input_dev->keybit);
	401	set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
	402	set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
	403	set_bit(BTN_LEFT, input_dev->keybit);
f7214ff4	404
c5b7c7c3	405	input_register_device(dev->input);
f7214ff4	406
c5b7c7c3 DT	407	/* save our data pointer in this interface device */
c5b7c7c3 DT	408	usb_set_intfdata(iface, dev);
f7214ff4 SP	409
	410	return 0;
	411
c5b7c7c3	412	err_free_urb:
f7214ff4	413	usb_free_urb(dev->urb);
c5b7c7c3	414	err_free_devs:
f7214ff4	415	usb_set_intfdata(iface, NULL);
f7214ff4	416	kfree(dev);
c5b7c7c3	417	input_free_device(input_dev);
f7214ff4 SP	418	return retval;
	419	}
	420
	421	static void atp_disconnect(struct usb_interface *iface)
	422	{
	423	struct atp *dev = usb_get_intfdata(iface);
	424
	425	usb_set_intfdata(iface, NULL);
	426	if (dev) {
	427	usb_kill_urb(dev->urb);
c5b7c7c3	428	input_unregister_device(dev->input);
f7214ff4 SP	429	usb_free_urb(dev->urb);
	430	usb_buffer_free(dev->udev, ATP_DATASIZE,
	431	dev->data, dev->urb->transfer_dma);
	432	kfree(dev);
	433	}
	434	printk(KERN_INFO "input: appletouch disconnected\n");
	435	}
	436
	437	static int atp_suspend(struct usb_interface *iface, pm_message_t message)
	438	{
	439	struct atp *dev = usb_get_intfdata(iface);
	440	usb_kill_urb(dev->urb);
	441	dev->valid = 0;
	442	return 0;
	443	}
	444
	445	static int atp_resume(struct usb_interface *iface)
	446	{
	447	struct atp *dev = usb_get_intfdata(iface);
	448	if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
	449	return -EIO;
	450
	451	return 0;
	452	}
	453
	454	static struct usb_driver atp_driver = {
	455	.owner = THIS_MODULE,
	456	.name = "appletouch",
	457	.probe = atp_probe,
	458	.disconnect = atp_disconnect,
	459	.suspend = atp_suspend,
	460	.resume = atp_resume,
	461	.id_table = atp_table,
	462	};
	463
	464	static int __init atp_init(void)
	465	{
	466	return usb_register(&atp_driver);
	467	}
	468
	469	static void __exit atp_exit(void)
	470	{
	471	usb_deregister(&atp_driver);
	472	}
	473
	474	module_init(atp_init);
	475	module_exit(atp_exit);