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/drivers/input/mouse/bcm5974.c

https://bitbucket.org/ndreys/linux-sunxi
C | 895 lines | 647 code | 133 blank | 115 comment | 58 complexity | 02c13d1d0fa881439caa0fcb508c39af MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * Apple USB BCM5974 (Macbook Air and Penryn Macbook Pro) multitouch driver
  3 *
  4 * Copyright (C) 2008	   Henrik Rydberg (rydberg@euromail.se)
  5 *
  6 * The USB initialization and package decoding was made by
  7 * Scott Shawcroft as part of the touchd user-space driver project:
  8 * Copyright (C) 2008	   Scott Shawcroft (scott.shawcroft@gmail.com)
  9 *
 10 * The BCM5974 driver is based on the appletouch driver:
 11 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 12 * Copyright (C) 2005      Johannes Berg (johannes@sipsolutions.net)
 13 * Copyright (C) 2005	   Stelian Pop (stelian@popies.net)
 14 * Copyright (C) 2005	   Frank Arnold (frank@scirocco-5v-turbo.de)
 15 * Copyright (C) 2005	   Peter Osterlund (petero2@telia.com)
 16 * Copyright (C) 2005	   Michael Hanselmann (linux-kernel@hansmi.ch)
 17 * Copyright (C) 2006	   Nicolas Boichat (nicolas@boichat.ch)
 18 *
 19 * This program is free software; you can redistribute it and/or modify
 20 * it under the terms of the GNU General Public License as published by
 21 * the Free Software Foundation; either version 2 of the License, or
 22 * (at your option) any later version.
 23 *
 24 * This program is distributed in the hope that it will be useful,
 25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 27 * GNU General Public License for more details.
 28 *
 29 * You should have received a copy of the GNU General Public License
 30 * along with this program; if not, write to the Free Software
 31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 32 *
 33 */
 34
 35#include <linux/kernel.h>
 36#include <linux/errno.h>
 37#include <linux/init.h>
 38#include <linux/slab.h>
 39#include <linux/module.h>
 40#include <linux/usb/input.h>
 41#include <linux/hid.h>
 42#include <linux/mutex.h>
 43
 44#define USB_VENDOR_ID_APPLE		0x05ac
 45
 46/* MacbookAir, aka wellspring */
 47#define USB_DEVICE_ID_APPLE_WELLSPRING_ANSI	0x0223
 48#define USB_DEVICE_ID_APPLE_WELLSPRING_ISO	0x0224
 49#define USB_DEVICE_ID_APPLE_WELLSPRING_JIS	0x0225
 50/* MacbookProPenryn, aka wellspring2 */
 51#define USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI	0x0230
 52#define USB_DEVICE_ID_APPLE_WELLSPRING2_ISO	0x0231
 53#define USB_DEVICE_ID_APPLE_WELLSPRING2_JIS	0x0232
 54/* Macbook5,1 (unibody), aka wellspring3 */
 55#define USB_DEVICE_ID_APPLE_WELLSPRING3_ANSI	0x0236
 56#define USB_DEVICE_ID_APPLE_WELLSPRING3_ISO	0x0237
 57#define USB_DEVICE_ID_APPLE_WELLSPRING3_JIS	0x0238
 58/* MacbookAir3,2 (unibody), aka wellspring5 */
 59#define USB_DEVICE_ID_APPLE_WELLSPRING4_ANSI	0x023f
 60#define USB_DEVICE_ID_APPLE_WELLSPRING4_ISO	0x0240
 61#define USB_DEVICE_ID_APPLE_WELLSPRING4_JIS	0x0241
 62/* MacbookAir3,1 (unibody), aka wellspring4 */
 63#define USB_DEVICE_ID_APPLE_WELLSPRING4A_ANSI	0x0242
 64#define USB_DEVICE_ID_APPLE_WELLSPRING4A_ISO	0x0243
 65#define USB_DEVICE_ID_APPLE_WELLSPRING4A_JIS	0x0244
 66/* Macbook8 (unibody, March 2011) */
 67#define USB_DEVICE_ID_APPLE_WELLSPRING5_ANSI	0x0245
 68#define USB_DEVICE_ID_APPLE_WELLSPRING5_ISO	0x0246
 69#define USB_DEVICE_ID_APPLE_WELLSPRING5_JIS	0x0247
 70
 71#define BCM5974_DEVICE(prod) {					\
 72	.match_flags = (USB_DEVICE_ID_MATCH_DEVICE |		\
 73			USB_DEVICE_ID_MATCH_INT_CLASS |		\
 74			USB_DEVICE_ID_MATCH_INT_PROTOCOL),	\
 75	.idVendor = USB_VENDOR_ID_APPLE,			\
 76	.idProduct = (prod),					\
 77	.bInterfaceClass = USB_INTERFACE_CLASS_HID,		\
 78	.bInterfaceProtocol = USB_INTERFACE_PROTOCOL_MOUSE	\
 79}
 80
 81/* table of devices that work with this driver */
 82static const struct usb_device_id bcm5974_table[] = {
 83	/* MacbookAir1.1 */
 84	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_ANSI),
 85	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_ISO),
 86	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_JIS),
 87	/* MacbookProPenryn */
 88	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI),
 89	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_ISO),
 90	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_JIS),
 91	/* Macbook5,1 */
 92	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING3_ANSI),
 93	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING3_ISO),
 94	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING3_JIS),
 95	/* MacbookAir3,2 */
 96	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING4_ANSI),
 97	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING4_ISO),
 98	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING4_JIS),
 99	/* MacbookAir3,1 */
100	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING4A_ANSI),
101	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING4A_ISO),
102	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING4A_JIS),
103	/* MacbookPro8 */
104	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING5_ANSI),
105	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING5_ISO),
106	BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING5_JIS),
107	/* Terminating entry */
108	{}
109};
110MODULE_DEVICE_TABLE(usb, bcm5974_table);
111
112MODULE_AUTHOR("Henrik Rydberg");
113MODULE_DESCRIPTION("Apple USB BCM5974 multitouch driver");
114MODULE_LICENSE("GPL");
115
116#define dprintk(level, format, a...)\
117	{ if (debug >= level) printk(KERN_DEBUG format, ##a); }
118
119static int debug = 1;
120module_param(debug, int, 0644);
121MODULE_PARM_DESC(debug, "Activate debugging output");
122
123/* button data structure */
124struct bt_data {
125	u8 unknown1;		/* constant */
126	u8 button;		/* left button */
127	u8 rel_x;		/* relative x coordinate */
128	u8 rel_y;		/* relative y coordinate */
129};
130
131/* trackpad header types */
132enum tp_type {
133	TYPE1,			/* plain trackpad */
134	TYPE2			/* button integrated in trackpad */
135};
136
137/* trackpad finger data offsets, le16-aligned */
138#define FINGER_TYPE1		(13 * sizeof(__le16))
139#define FINGER_TYPE2		(15 * sizeof(__le16))
140
141/* trackpad button data offsets */
142#define BUTTON_TYPE2		15
143
144/* list of device capability bits */
145#define HAS_INTEGRATED_BUTTON	1
146
147/* trackpad finger structure, le16-aligned */
148struct tp_finger {
149	__le16 origin;		/* zero when switching track finger */
150	__le16 abs_x;		/* absolute x coodinate */
151	__le16 abs_y;		/* absolute y coodinate */
152	__le16 rel_x;		/* relative x coodinate */
153	__le16 rel_y;		/* relative y coodinate */
154	__le16 size_major;	/* finger size, major axis? */
155	__le16 size_minor;	/* finger size, minor axis? */
156	__le16 orientation;	/* 16384 when point, else 15 bit angle */
157	__le16 force_major;	/* trackpad force, major axis? */
158	__le16 force_minor;	/* trackpad force, minor axis? */
159	__le16 unused[3];	/* zeros */
160	__le16 multi;		/* one finger: varies, more fingers: constant */
161} __attribute__((packed,aligned(2)));
162
163/* trackpad finger data size, empirically at least ten fingers */
164#define SIZEOF_FINGER		sizeof(struct tp_finger)
165#define SIZEOF_ALL_FINGERS	(16 * SIZEOF_FINGER)
166#define MAX_FINGER_ORIENTATION	16384
167
168/* device-specific parameters */
169struct bcm5974_param {
170	int dim;		/* logical dimension */
171	int fuzz;		/* logical noise value */
172	int devmin;		/* device minimum reading */
173	int devmax;		/* device maximum reading */
174};
175
176/* device-specific configuration */
177struct bcm5974_config {
178	int ansi, iso, jis;	/* the product id of this device */
179	int caps;		/* device capability bitmask */
180	int bt_ep;		/* the endpoint of the button interface */
181	int bt_datalen;		/* data length of the button interface */
182	int tp_ep;		/* the endpoint of the trackpad interface */
183	enum tp_type tp_type;	/* type of trackpad interface */
184	int tp_offset;		/* offset to trackpad finger data */
185	int tp_datalen;		/* data length of the trackpad interface */
186	struct bcm5974_param p;	/* finger pressure limits */
187	struct bcm5974_param w;	/* finger width limits */
188	struct bcm5974_param x;	/* horizontal limits */
189	struct bcm5974_param y;	/* vertical limits */
190};
191
192/* logical device structure */
193struct bcm5974 {
194	char phys[64];
195	struct usb_device *udev;	/* usb device */
196	struct usb_interface *intf;	/* our interface */
197	struct input_dev *input;	/* input dev */
198	struct bcm5974_config cfg;	/* device configuration */
199	struct mutex pm_mutex;		/* serialize access to open/suspend */
200	int opened;			/* 1: opened, 0: closed */
201	struct urb *bt_urb;		/* button usb request block */
202	struct bt_data *bt_data;	/* button transferred data */
203	struct urb *tp_urb;		/* trackpad usb request block */
204	u8 *tp_data;			/* trackpad transferred data */
205	int fingers;			/* number of fingers on trackpad */
206};
207
208/* logical dimensions */
209#define DIM_PRESSURE	256		/* maximum finger pressure */
210#define DIM_WIDTH	16		/* maximum finger width */
211#define DIM_X		1280		/* maximum trackpad x value */
212#define DIM_Y		800		/* maximum trackpad y value */
213
214/* logical signal quality */
215#define SN_PRESSURE	45		/* pressure signal-to-noise ratio */
216#define SN_WIDTH	100		/* width signal-to-noise ratio */
217#define SN_COORD	250		/* coordinate signal-to-noise ratio */
218
219/* pressure thresholds */
220#define PRESSURE_LOW	(2 * DIM_PRESSURE / SN_PRESSURE)
221#define PRESSURE_HIGH	(3 * PRESSURE_LOW)
222
223/* device constants */
224static const struct bcm5974_config bcm5974_config_table[] = {
225	{
226		USB_DEVICE_ID_APPLE_WELLSPRING_ANSI,
227		USB_DEVICE_ID_APPLE_WELLSPRING_ISO,
228		USB_DEVICE_ID_APPLE_WELLSPRING_JIS,
229		0,
230		0x84, sizeof(struct bt_data),
231		0x81, TYPE1, FINGER_TYPE1, FINGER_TYPE1 + SIZEOF_ALL_FINGERS,
232		{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
233		{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
234		{ DIM_X, DIM_X / SN_COORD, -4824, 5342 },
235		{ DIM_Y, DIM_Y / SN_COORD, -172, 5820 }
236	},
237	{
238		USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI,
239		USB_DEVICE_ID_APPLE_WELLSPRING2_ISO,
240		USB_DEVICE_ID_APPLE_WELLSPRING2_JIS,
241		0,
242		0x84, sizeof(struct bt_data),
243		0x81, TYPE1, FINGER_TYPE1, FINGER_TYPE1 + SIZEOF_ALL_FINGERS,
244		{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
245		{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
246		{ DIM_X, DIM_X / SN_COORD, -4824, 4824 },
247		{ DIM_Y, DIM_Y / SN_COORD, -172, 4290 }
248	},
249	{
250		USB_DEVICE_ID_APPLE_WELLSPRING3_ANSI,
251		USB_DEVICE_ID_APPLE_WELLSPRING3_ISO,
252		USB_DEVICE_ID_APPLE_WELLSPRING3_JIS,
253		HAS_INTEGRATED_BUTTON,
254		0x84, sizeof(struct bt_data),
255		0x81, TYPE2, FINGER_TYPE2, FINGER_TYPE2 + SIZEOF_ALL_FINGERS,
256		{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 300 },
257		{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
258		{ DIM_X, DIM_X / SN_COORD, -4460, 5166 },
259		{ DIM_Y, DIM_Y / SN_COORD, -75, 6700 }
260	},
261	{
262		USB_DEVICE_ID_APPLE_WELLSPRING4_ANSI,
263		USB_DEVICE_ID_APPLE_WELLSPRING4_ISO,
264		USB_DEVICE_ID_APPLE_WELLSPRING4_JIS,
265		HAS_INTEGRATED_BUTTON,
266		0x84, sizeof(struct bt_data),
267		0x81, TYPE2, FINGER_TYPE2, FINGER_TYPE2 + SIZEOF_ALL_FINGERS,
268		{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 300 },
269		{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
270		{ DIM_X, DIM_X / SN_COORD, -4620, 5140 },
271		{ DIM_Y, DIM_Y / SN_COORD, -150, 6600 }
272	},
273	{
274		USB_DEVICE_ID_APPLE_WELLSPRING4A_ANSI,
275		USB_DEVICE_ID_APPLE_WELLSPRING4A_ISO,
276		USB_DEVICE_ID_APPLE_WELLSPRING4A_JIS,
277		HAS_INTEGRATED_BUTTON,
278		0x84, sizeof(struct bt_data),
279		0x81, TYPE2, FINGER_TYPE2, FINGER_TYPE2 + SIZEOF_ALL_FINGERS,
280		{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 300 },
281		{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
282		{ DIM_X, DIM_X / SN_COORD, -4616, 5112 },
283		{ DIM_Y, DIM_Y / SN_COORD, -142, 5234 }
284	},
285	{
286		USB_DEVICE_ID_APPLE_WELLSPRING5_ANSI,
287		USB_DEVICE_ID_APPLE_WELLSPRING5_ISO,
288		USB_DEVICE_ID_APPLE_WELLSPRING5_JIS,
289		HAS_INTEGRATED_BUTTON,
290		0x84, sizeof(struct bt_data),
291		0x81, TYPE2, FINGER_TYPE2, FINGER_TYPE2 + SIZEOF_ALL_FINGERS,
292		{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 300 },
293		{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
294		{ DIM_X, DIM_X / SN_COORD, -4415, 5050 },
295		{ DIM_Y, DIM_Y / SN_COORD, -55, 6680 }
296	},
297	{}
298};
299
300/* return the device-specific configuration by device */
301static const struct bcm5974_config *bcm5974_get_config(struct usb_device *udev)
302{
303	u16 id = le16_to_cpu(udev->descriptor.idProduct);
304	const struct bcm5974_config *cfg;
305
306	for (cfg = bcm5974_config_table; cfg->ansi; ++cfg)
307		if (cfg->ansi == id || cfg->iso == id || cfg->jis == id)
308			return cfg;
309
310	return bcm5974_config_table;
311}
312
313/* convert 16-bit little endian to signed integer */
314static inline int raw2int(__le16 x)
315{
316	return (signed short)le16_to_cpu(x);
317}
318
319/* scale device data to logical dimensions (asserts devmin < devmax) */
320static inline int int2scale(const struct bcm5974_param *p, int x)
321{
322	return x * p->dim / (p->devmax - p->devmin);
323}
324
325/* all logical value ranges are [0,dim). */
326static inline int int2bound(const struct bcm5974_param *p, int x)
327{
328	int s = int2scale(p, x);
329
330	return clamp_val(s, 0, p->dim - 1);
331}
332
333/* setup which logical events to report */
334static void setup_events_to_report(struct input_dev *input_dev,
335				   const struct bcm5974_config *cfg)
336{
337	__set_bit(EV_ABS, input_dev->evbit);
338
339	input_set_abs_params(input_dev, ABS_PRESSURE,
340				0, cfg->p.dim, cfg->p.fuzz, 0);
341	input_set_abs_params(input_dev, ABS_TOOL_WIDTH,
342				0, cfg->w.dim, cfg->w.fuzz, 0);
343	input_set_abs_params(input_dev, ABS_X,
344				0, cfg->x.dim, cfg->x.fuzz, 0);
345	input_set_abs_params(input_dev, ABS_Y,
346				0, cfg->y.dim, cfg->y.fuzz, 0);
347
348	/* finger touch area */
349	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
350			     cfg->w.devmin, cfg->w.devmax, 0, 0);
351	input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
352			     cfg->w.devmin, cfg->w.devmax, 0, 0);
353	/* finger approach area */
354	input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR,
355			     cfg->w.devmin, cfg->w.devmax, 0, 0);
356	input_set_abs_params(input_dev, ABS_MT_WIDTH_MINOR,
357			     cfg->w.devmin, cfg->w.devmax, 0, 0);
358	/* finger orientation */
359	input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
360			     -MAX_FINGER_ORIENTATION,
361			     MAX_FINGER_ORIENTATION, 0, 0);
362	/* finger position */
363	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
364			     cfg->x.devmin, cfg->x.devmax, 0, 0);
365	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
366			     cfg->y.devmin, cfg->y.devmax, 0, 0);
367
368	__set_bit(EV_KEY, input_dev->evbit);
369	__set_bit(BTN_TOUCH, input_dev->keybit);
370	__set_bit(BTN_TOOL_FINGER, input_dev->keybit);
371	__set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
372	__set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
373	__set_bit(BTN_TOOL_QUADTAP, input_dev->keybit);
374	__set_bit(BTN_LEFT, input_dev->keybit);
375
376	input_set_events_per_packet(input_dev, 60);
377}
378
379/* report button data as logical button state */
380static int report_bt_state(struct bcm5974 *dev, int size)
381{
382	if (size != sizeof(struct bt_data))
383		return -EIO;
384
385	dprintk(7,
386		"bcm5974: button data: %x %x %x %x\n",
387		dev->bt_data->unknown1, dev->bt_data->button,
388		dev->bt_data->rel_x, dev->bt_data->rel_y);
389
390	input_report_key(dev->input, BTN_LEFT, dev->bt_data->button);
391	input_sync(dev->input);
392
393	return 0;
394}
395
396static void report_finger_data(struct input_dev *input,
397			       const struct bcm5974_config *cfg,
398			       const struct tp_finger *f)
399{
400	input_report_abs(input, ABS_MT_TOUCH_MAJOR,
401			 raw2int(f->force_major) << 1);
402	input_report_abs(input, ABS_MT_TOUCH_MINOR,
403			 raw2int(f->force_minor) << 1);
404	input_report_abs(input, ABS_MT_WIDTH_MAJOR,
405			 raw2int(f->size_major) << 1);
406	input_report_abs(input, ABS_MT_WIDTH_MINOR,
407			 raw2int(f->size_minor) << 1);
408	input_report_abs(input, ABS_MT_ORIENTATION,
409			 MAX_FINGER_ORIENTATION - raw2int(f->orientation));
410	input_report_abs(input, ABS_MT_POSITION_X, raw2int(f->abs_x));
411	input_report_abs(input, ABS_MT_POSITION_Y,
412			 cfg->y.devmin + cfg->y.devmax - raw2int(f->abs_y));
413	input_mt_sync(input);
414}
415
416/* report trackpad data as logical trackpad state */
417static int report_tp_state(struct bcm5974 *dev, int size)
418{
419	const struct bcm5974_config *c = &dev->cfg;
420	const struct tp_finger *f;
421	struct input_dev *input = dev->input;
422	int raw_p, raw_w, raw_x, raw_y, raw_n, i;
423	int ptest, origin, ibt = 0, nmin = 0, nmax = 0;
424	int abs_p = 0, abs_w = 0, abs_x = 0, abs_y = 0;
425
426	if (size < c->tp_offset || (size - c->tp_offset) % SIZEOF_FINGER != 0)
427		return -EIO;
428
429	/* finger data, le16-aligned */
430	f = (const struct tp_finger *)(dev->tp_data + c->tp_offset);
431	raw_n = (size - c->tp_offset) / SIZEOF_FINGER;
432
433	/* always track the first finger; when detached, start over */
434	if (raw_n) {
435
436		/* report raw trackpad data */
437		for (i = 0; i < raw_n; i++)
438			report_finger_data(input, c, &f[i]);
439
440		raw_p = raw2int(f->force_major);
441		raw_w = raw2int(f->size_major);
442		raw_x = raw2int(f->abs_x);
443		raw_y = raw2int(f->abs_y);
444
445		dprintk(9,
446			"bcm5974: "
447			"raw: p: %+05d w: %+05d x: %+05d y: %+05d n: %d\n",
448			raw_p, raw_w, raw_x, raw_y, raw_n);
449
450		ptest = int2bound(&c->p, raw_p);
451		origin = raw2int(f->origin);
452
453		/* while tracking finger still valid, count all fingers */
454		if (ptest > PRESSURE_LOW && origin) {
455			abs_p = ptest;
456			abs_w = int2bound(&c->w, raw_w);
457			abs_x = int2bound(&c->x, raw_x - c->x.devmin);
458			abs_y = int2bound(&c->y, c->y.devmax - raw_y);
459			while (raw_n--) {
460				ptest = int2bound(&c->p,
461						  raw2int(f->force_major));
462				if (ptest > PRESSURE_LOW)
463					nmax++;
464				if (ptest > PRESSURE_HIGH)
465					nmin++;
466				f++;
467			}
468		}
469	}
470
471	/* set the integrated button if applicable */
472	if (c->tp_type == TYPE2)
473		ibt = raw2int(dev->tp_data[BUTTON_TYPE2]);
474
475	if (dev->fingers < nmin)
476		dev->fingers = nmin;
477	if (dev->fingers > nmax)
478		dev->fingers = nmax;
479
480	input_report_key(input, BTN_TOUCH, dev->fingers > 0);
481	input_report_key(input, BTN_TOOL_FINGER, dev->fingers == 1);
482	input_report_key(input, BTN_TOOL_DOUBLETAP, dev->fingers == 2);
483	input_report_key(input, BTN_TOOL_TRIPLETAP, dev->fingers == 3);
484	input_report_key(input, BTN_TOOL_QUADTAP, dev->fingers > 3);
485
486	input_report_abs(input, ABS_PRESSURE, abs_p);
487	input_report_abs(input, ABS_TOOL_WIDTH, abs_w);
488
489	if (abs_p) {
490		input_report_abs(input, ABS_X, abs_x);
491		input_report_abs(input, ABS_Y, abs_y);
492
493		dprintk(8,
494			"bcm5974: abs: p: %+05d w: %+05d x: %+05d y: %+05d "
495			"nmin: %d nmax: %d n: %d ibt: %d\n", abs_p, abs_w,
496			abs_x, abs_y, nmin, nmax, dev->fingers, ibt);
497
498	}
499
500	/* type 2 reports button events via ibt only */
501	if (c->tp_type == TYPE2)
502		input_report_key(input, BTN_LEFT, ibt);
503
504	input_sync(input);
505
506	return 0;
507}
508
509/* Wellspring initialization constants */
510#define BCM5974_WELLSPRING_MODE_READ_REQUEST_ID		1
511#define BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID	9
512#define BCM5974_WELLSPRING_MODE_REQUEST_VALUE		0x300
513#define BCM5974_WELLSPRING_MODE_REQUEST_INDEX		0
514#define BCM5974_WELLSPRING_MODE_VENDOR_VALUE		0x01
515#define BCM5974_WELLSPRING_MODE_NORMAL_VALUE		0x08
516
517static int bcm5974_wellspring_mode(struct bcm5974 *dev, bool on)
518{
519	char *data = kmalloc(8, GFP_KERNEL);
520	int retval = 0, size;
521
522	if (!data) {
523		err("bcm5974: out of memory");
524		retval = -ENOMEM;
525		goto out;
526	}
527
528	/* read configuration */
529	size = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
530			BCM5974_WELLSPRING_MODE_READ_REQUEST_ID,
531			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
532			BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
533			BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
534
535	if (size != 8) {
536		err("bcm5974: could not read from device");
537		retval = -EIO;
538		goto out;
539	}
540
541	/* apply the mode switch */
542	data[0] = on ?
543		BCM5974_WELLSPRING_MODE_VENDOR_VALUE :
544		BCM5974_WELLSPRING_MODE_NORMAL_VALUE;
545
546	/* write configuration */
547	size = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
548			BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID,
549			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
550			BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
551			BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
552
553	if (size != 8) {
554		err("bcm5974: could not write to device");
555		retval = -EIO;
556		goto out;
557	}
558
559	dprintk(2, "bcm5974: switched to %s mode.\n",
560		on ? "wellspring" : "normal");
561
562 out:
563	kfree(data);
564	return retval;
565}
566
567static void bcm5974_irq_button(struct urb *urb)
568{
569	struct bcm5974 *dev = urb->context;
570	int error;
571
572	switch (urb->status) {
573	case 0:
574		break;
575	case -EOVERFLOW:
576	case -ECONNRESET:
577	case -ENOENT:
578	case -ESHUTDOWN:
579		dbg("bcm5974: button urb shutting down: %d", urb->status);
580		return;
581	default:
582		dbg("bcm5974: button urb status: %d", urb->status);
583		goto exit;
584	}
585
586	if (report_bt_state(dev, dev->bt_urb->actual_length))
587		dprintk(1, "bcm5974: bad button package, length: %d\n",
588			dev->bt_urb->actual_length);
589
590exit:
591	error = usb_submit_urb(dev->bt_urb, GFP_ATOMIC);
592	if (error)
593		err("bcm5974: button urb failed: %d", error);
594}
595
596static void bcm5974_irq_trackpad(struct urb *urb)
597{
598	struct bcm5974 *dev = urb->context;
599	int error;
600
601	switch (urb->status) {
602	case 0:
603		break;
604	case -EOVERFLOW:
605	case -ECONNRESET:
606	case -ENOENT:
607	case -ESHUTDOWN:
608		dbg("bcm5974: trackpad urb shutting down: %d", urb->status);
609		return;
610	default:
611		dbg("bcm5974: trackpad urb status: %d", urb->status);
612		goto exit;
613	}
614
615	/* control response ignored */
616	if (dev->tp_urb->actual_length == 2)
617		goto exit;
618
619	if (report_tp_state(dev, dev->tp_urb->actual_length))
620		dprintk(1, "bcm5974: bad trackpad package, length: %d\n",
621			dev->tp_urb->actual_length);
622
623exit:
624	error = usb_submit_urb(dev->tp_urb, GFP_ATOMIC);
625	if (error)
626		err("bcm5974: trackpad urb failed: %d", error);
627}
628
629/*
630 * The Wellspring trackpad, like many recent Apple trackpads, share
631 * the usb device with the keyboard. Since keyboards are usually
632 * handled by the HID system, the device ends up being handled by two
633 * modules. Setting up the device therefore becomes slightly
634 * complicated. To enable multitouch features, a mode switch is
635 * required, which is usually applied via the control interface of the
636 * device.  It can be argued where this switch should take place. In
637 * some drivers, like appletouch, the switch is made during
638 * probe. However, the hid module may also alter the state of the
639 * device, resulting in trackpad malfunction under certain
640 * circumstances. To get around this problem, there is at least one
641 * example that utilizes the USB_QUIRK_RESET_RESUME quirk in order to
642 * receive a reset_resume request rather than the normal resume.
643 * Since the implementation of reset_resume is equal to mode switch
644 * plus start_traffic, it seems easier to always do the switch when
645 * starting traffic on the device.
646 */
647static int bcm5974_start_traffic(struct bcm5974 *dev)
648{
649	int error;
650
651	error = bcm5974_wellspring_mode(dev, true);
652	if (error) {
653		dprintk(1, "bcm5974: mode switch failed\n");
654		goto err_out;
655	}
656
657	error = usb_submit_urb(dev->bt_urb, GFP_KERNEL);
658	if (error)
659		goto err_reset_mode;
660
661	error = usb_submit_urb(dev->tp_urb, GFP_KERNEL);
662	if (error)
663		goto err_kill_bt;
664
665	return 0;
666
667err_kill_bt:
668	usb_kill_urb(dev->bt_urb);
669err_reset_mode:
670	bcm5974_wellspring_mode(dev, false);
671err_out:
672	return error;
673}
674
675static void bcm5974_pause_traffic(struct bcm5974 *dev)
676{
677	usb_kill_urb(dev->tp_urb);
678	usb_kill_urb(dev->bt_urb);
679	bcm5974_wellspring_mode(dev, false);
680}
681
682/*
683 * The code below implements open/close and manual suspend/resume.
684 * All functions may be called in random order.
685 *
686 * Opening a suspended device fails with EACCES - permission denied.
687 *
688 * Failing a resume leaves the device resumed but closed.
689 */
690static int bcm5974_open(struct input_dev *input)
691{
692	struct bcm5974 *dev = input_get_drvdata(input);
693	int error;
694
695	error = usb_autopm_get_interface(dev->intf);
696	if (error)
697		return error;
698
699	mutex_lock(&dev->pm_mutex);
700
701	error = bcm5974_start_traffic(dev);
702	if (!error)
703		dev->opened = 1;
704
705	mutex_unlock(&dev->pm_mutex);
706
707	if (error)
708		usb_autopm_put_interface(dev->intf);
709
710	return error;
711}
712
713static void bcm5974_close(struct input_dev *input)
714{
715	struct bcm5974 *dev = input_get_drvdata(input);
716
717	mutex_lock(&dev->pm_mutex);
718
719	bcm5974_pause_traffic(dev);
720	dev->opened = 0;
721
722	mutex_unlock(&dev->pm_mutex);
723
724	usb_autopm_put_interface(dev->intf);
725}
726
727static int bcm5974_suspend(struct usb_interface *iface, pm_message_t message)
728{
729	struct bcm5974 *dev = usb_get_intfdata(iface);
730
731	mutex_lock(&dev->pm_mutex);
732
733	if (dev->opened)
734		bcm5974_pause_traffic(dev);
735
736	mutex_unlock(&dev->pm_mutex);
737
738	return 0;
739}
740
741static int bcm5974_resume(struct usb_interface *iface)
742{
743	struct bcm5974 *dev = usb_get_intfdata(iface);
744	int error = 0;
745
746	mutex_lock(&dev->pm_mutex);
747
748	if (dev->opened)
749		error = bcm5974_start_traffic(dev);
750
751	mutex_unlock(&dev->pm_mutex);
752
753	return error;
754}
755
756static int bcm5974_probe(struct usb_interface *iface,
757			 const struct usb_device_id *id)
758{
759	struct usb_device *udev = interface_to_usbdev(iface);
760	const struct bcm5974_config *cfg;
761	struct bcm5974 *dev;
762	struct input_dev *input_dev;
763	int error = -ENOMEM;
764
765	/* find the product index */
766	cfg = bcm5974_get_config(udev);
767
768	/* allocate memory for our device state and initialize it */
769	dev = kzalloc(sizeof(struct bcm5974), GFP_KERNEL);
770	input_dev = input_allocate_device();
771	if (!dev || !input_dev) {
772		err("bcm5974: out of memory");
773		goto err_free_devs;
774	}
775
776	dev->udev = udev;
777	dev->intf = iface;
778	dev->input = input_dev;
779	dev->cfg = *cfg;
780	mutex_init(&dev->pm_mutex);
781
782	/* setup urbs */
783	dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL);
784	if (!dev->bt_urb)
785		goto err_free_devs;
786
787	dev->tp_urb = usb_alloc_urb(0, GFP_KERNEL);
788	if (!dev->tp_urb)
789		goto err_free_bt_urb;
790
791	dev->bt_data = usb_alloc_coherent(dev->udev,
792					  dev->cfg.bt_datalen, GFP_KERNEL,
793					  &dev->bt_urb->transfer_dma);
794	if (!dev->bt_data)
795		goto err_free_urb;
796
797	dev->tp_data = usb_alloc_coherent(dev->udev,
798					  dev->cfg.tp_datalen, GFP_KERNEL,
799					  &dev->tp_urb->transfer_dma);
800	if (!dev->tp_data)
801		goto err_free_bt_buffer;
802
803	usb_fill_int_urb(dev->bt_urb, udev,
804			 usb_rcvintpipe(udev, cfg->bt_ep),
805			 dev->bt_data, dev->cfg.bt_datalen,
806			 bcm5974_irq_button, dev, 1);
807
808	usb_fill_int_urb(dev->tp_urb, udev,
809			 usb_rcvintpipe(udev, cfg->tp_ep),
810			 dev->tp_data, dev->cfg.tp_datalen,
811			 bcm5974_irq_trackpad, dev, 1);
812
813	/* create bcm5974 device */
814	usb_make_path(udev, dev->phys, sizeof(dev->phys));
815	strlcat(dev->phys, "/input0", sizeof(dev->phys));
816
817	input_dev->name = "bcm5974";
818	input_dev->phys = dev->phys;
819	usb_to_input_id(dev->udev, &input_dev->id);
820	/* report driver capabilities via the version field */
821	input_dev->id.version = cfg->caps;
822	input_dev->dev.parent = &iface->dev;
823
824	input_set_drvdata(input_dev, dev);
825
826	input_dev->open = bcm5974_open;
827	input_dev->close = bcm5974_close;
828
829	setup_events_to_report(input_dev, cfg);
830
831	error = input_register_device(dev->input);
832	if (error)
833		goto err_free_buffer;
834
835	/* save our data pointer in this interface device */
836	usb_set_intfdata(iface, dev);
837
838	return 0;
839
840err_free_buffer:
841	usb_free_coherent(dev->udev, dev->cfg.tp_datalen,
842		dev->tp_data, dev->tp_urb->transfer_dma);
843err_free_bt_buffer:
844	usb_free_coherent(dev->udev, dev->cfg.bt_datalen,
845		dev->bt_data, dev->bt_urb->transfer_dma);
846err_free_urb:
847	usb_free_urb(dev->tp_urb);
848err_free_bt_urb:
849	usb_free_urb(dev->bt_urb);
850err_free_devs:
851	usb_set_intfdata(iface, NULL);
852	input_free_device(input_dev);
853	kfree(dev);
854	return error;
855}
856
857static void bcm5974_disconnect(struct usb_interface *iface)
858{
859	struct bcm5974 *dev = usb_get_intfdata(iface);
860
861	usb_set_intfdata(iface, NULL);
862
863	input_unregister_device(dev->input);
864	usb_free_coherent(dev->udev, dev->cfg.tp_datalen,
865			  dev->tp_data, dev->tp_urb->transfer_dma);
866	usb_free_coherent(dev->udev, dev->cfg.bt_datalen,
867			  dev->bt_data, dev->bt_urb->transfer_dma);
868	usb_free_urb(dev->tp_urb);
869	usb_free_urb(dev->bt_urb);
870	kfree(dev);
871}
872
873static struct usb_driver bcm5974_driver = {
874	.name			= "bcm5974",
875	.probe			= bcm5974_probe,
876	.disconnect		= bcm5974_disconnect,
877	.suspend		= bcm5974_suspend,
878	.resume			= bcm5974_resume,
879	.id_table		= bcm5974_table,
880	.supports_autosuspend	= 1,
881};
882
883static int __init bcm5974_init(void)
884{
885	return usb_register(&bcm5974_driver);
886}
887
888static void __exit bcm5974_exit(void)
889{
890	usb_deregister(&bcm5974_driver);
891}
892
893module_init(bcm5974_init);
894module_exit(bcm5974_exit);
895