2 * Apple USB BCM5974 (Macbook Air and Penryn Macbook Pro) multitouch driver
4 * Copyright (C) 2008 Henrik Rydberg (rydberg@euromail.se)
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)
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)
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.
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.
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.
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>
44 #define USB_VENDOR_ID_APPLE 0x05ac
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
55 #define BCM5974_DEVICE(prod) { \
56 .match_flags = (USB_DEVICE_ID_MATCH_DEVICE | \
57 USB_DEVICE_ID_MATCH_INT_CLASS | \
58 USB_DEVICE_ID_MATCH_INT_PROTOCOL), \
59 .idVendor = USB_VENDOR_ID_APPLE, \
60 .idProduct = (prod), \
61 .bInterfaceClass = USB_INTERFACE_CLASS_HID, \
62 .bInterfaceProtocol = USB_INTERFACE_PROTOCOL_MOUSE \
65 /* table of devices that work with this driver */
66 static const struct usb_device_id bcm5974_table [] = {
68 BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_ANSI),
69 BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_ISO),
70 BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_JIS),
71 /* MacbookProPenryn */
72 BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI),
73 BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_ISO),
74 BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_JIS),
75 /* Terminating entry */
78 MODULE_DEVICE_TABLE(usb, bcm5974_table);
80 MODULE_AUTHOR("Henrik Rydberg");
81 MODULE_DESCRIPTION("Apple USB BCM5974 multitouch driver");
82 MODULE_LICENSE("GPL");
84 #define dprintk(level, format, a...)\
85 { if (debug >= level) printk(KERN_DEBUG format, ##a); }
88 module_param(debug, int, 0644);
89 MODULE_PARM_DESC(debug, "Activate debugging output");
91 /* button data structure */
93 u8 unknown1; /* constant */
94 u8 button; /* left button */
95 u8 rel_x; /* relative x coordinate */
96 u8 rel_y; /* relative y coordinate */
99 /* trackpad header structure */
101 u8 unknown1[16]; /* constants, timers, etc */
102 u8 fingers; /* number of fingers on trackpad */
103 u8 unknown2[9]; /* constants, timers, etc */
106 /* trackpad finger structure */
108 __le16 origin; /* left/right origin? */
109 __le16 abs_x; /* absolute x coodinate */
110 __le16 abs_y; /* absolute y coodinate */
111 __le16 rel_x; /* relative x coodinate */
112 __le16 rel_y; /* relative y coodinate */
113 __le16 size_major; /* finger size, major axis? */
114 __le16 size_minor; /* finger size, minor axis? */
115 __le16 orientation; /* 16384 when point, else 15 bit angle */
116 __le16 force_major; /* trackpad force, major axis? */
117 __le16 force_minor; /* trackpad force, minor axis? */
118 __le16 unused[3]; /* zeros */
119 __le16 multi; /* one finger: varies, more fingers: constant */
122 /* trackpad data structure, empirically at least ten fingers */
124 struct tp_header header;
125 struct tp_finger finger[16];
128 /* device-specific parameters */
129 struct bcm5974_param {
130 int dim; /* logical dimension */
131 int fuzz; /* logical noise value */
132 int devmin; /* device minimum reading */
133 int devmax; /* device maximum reading */
136 /* device-specific configuration */
137 struct bcm5974_config {
138 int ansi, iso, jis; /* the product id of this device */
139 int bt_ep; /* the endpoint of the button interface */
140 int bt_datalen; /* data length of the button interface */
141 int tp_ep; /* the endpoint of the trackpad interface */
142 int tp_datalen; /* data length of the trackpad interface */
143 struct bcm5974_param p; /* finger pressure limits */
144 struct bcm5974_param w; /* finger width limits */
145 struct bcm5974_param x; /* horizontal limits */
146 struct bcm5974_param y; /* vertical limits */
149 /* logical device structure */
152 struct usb_device *udev; /* usb device */
153 struct input_dev *input; /* input dev */
154 struct bcm5974_config cfg; /* device configuration */
155 struct mutex pm_mutex; /* serialize access to open/suspend */
156 int opened; /* 1: opened, 0: closed */
157 struct urb *bt_urb; /* button usb request block */
158 struct bt_data *bt_data; /* button transferred data */
159 struct urb *tp_urb; /* trackpad usb request block */
160 struct tp_data *tp_data; /* trackpad transferred data */
163 /* logical dimensions */
164 #define DIM_PRESSURE 256 /* maximum finger pressure */
165 #define DIM_WIDTH 16 /* maximum finger width */
166 #define DIM_X 1280 /* maximum trackpad x value */
167 #define DIM_Y 800 /* maximum trackpad y value */
169 /* logical signal quality */
170 #define SN_PRESSURE 45 /* pressure signal-to-noise ratio */
171 #define SN_WIDTH 100 /* width signal-to-noise ratio */
172 #define SN_COORD 250 /* coordinate signal-to-noise ratio */
174 /* device constants */
175 static const struct bcm5974_config bcm5974_config_table[] = {
177 USB_DEVICE_ID_APPLE_WELLSPRING_ANSI,
178 USB_DEVICE_ID_APPLE_WELLSPRING_ISO,
179 USB_DEVICE_ID_APPLE_WELLSPRING_JIS,
180 0x84, sizeof(struct bt_data),
181 0x81, sizeof(struct tp_data),
182 { DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
183 { DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
184 { DIM_X, DIM_X / SN_COORD, -4824, 5342 },
185 { DIM_Y, DIM_Y / SN_COORD, -172, 5820 }
188 USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI,
189 USB_DEVICE_ID_APPLE_WELLSPRING2_ISO,
190 USB_DEVICE_ID_APPLE_WELLSPRING2_JIS,
191 0x84, sizeof(struct bt_data),
192 0x81, sizeof(struct tp_data),
193 { DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
194 { DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
195 { DIM_X, DIM_X / SN_COORD, -4824, 4824 },
196 { DIM_Y, DIM_Y / SN_COORD, -172, 4290 }
201 /* return the device-specific configuration by device */
202 static const struct bcm5974_config *bcm5974_get_config(struct usb_device *udev)
204 u16 id = le16_to_cpu(udev->descriptor.idProduct);
205 const struct bcm5974_config *cfg;
207 for (cfg = bcm5974_config_table; cfg->ansi; ++cfg)
208 if (cfg->ansi == id || cfg->iso == id || cfg->jis == id)
211 return bcm5974_config_table;
214 /* convert 16-bit little endian to signed integer */
215 static inline int raw2int(__le16 x)
217 return (signed short)le16_to_cpu(x);
220 /* scale device data to logical dimensions (asserts devmin < devmax) */
221 static inline int int2scale(const struct bcm5974_param *p, int x)
223 return x * p->dim / (p->devmax - p->devmin);
226 /* all logical value ranges are [0,dim). */
227 static inline int int2bound(const struct bcm5974_param *p, int x)
229 int s = int2scale(p, x);
231 return clamp_val(s, 0, p->dim - 1);
234 /* setup which logical events to report */
235 static void setup_events_to_report(struct input_dev *input_dev,
236 const struct bcm5974_config *cfg)
238 __set_bit(EV_ABS, input_dev->evbit);
240 input_set_abs_params(input_dev, ABS_PRESSURE,
241 0, cfg->p.dim, cfg->p.fuzz, 0);
242 input_set_abs_params(input_dev, ABS_TOOL_WIDTH,
243 0, cfg->w.dim, cfg->w.fuzz, 0);
244 input_set_abs_params(input_dev, ABS_X,
245 0, cfg->x.dim, cfg->x.fuzz, 0);
246 input_set_abs_params(input_dev, ABS_Y,
247 0, cfg->y.dim, cfg->y.fuzz, 0);
249 __set_bit(EV_KEY, input_dev->evbit);
250 __set_bit(BTN_TOOL_FINGER, input_dev->keybit);
251 __set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
252 __set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
253 __set_bit(BTN_LEFT, input_dev->keybit);
256 /* report button data as logical button state */
257 static int report_bt_state(struct bcm5974 *dev, int size)
259 if (size != sizeof(struct bt_data))
262 input_report_key(dev->input, BTN_LEFT, dev->bt_data->button);
263 input_sync(dev->input);
268 /* report trackpad data as logical trackpad state */
269 static int report_tp_state(struct bcm5974 *dev, int size)
271 const struct bcm5974_config *c = &dev->cfg;
272 const struct tp_finger *f = dev->tp_data->finger;
273 struct input_dev *input = dev->input;
274 const int fingers = (size - 26) / 28;
275 int p = 0, w, x, y, n = 0;
277 if (size < 26 || (size - 26) % 28 != 0)
281 p = raw2int(f->force_major);
282 w = raw2int(f->size_major);
283 x = raw2int(f->abs_x);
284 y = raw2int(f->abs_y);
285 n = p > 0 ? fingers : 0;
288 "bcm5974: p: %+05d w: %+05d x: %+05d y: %+05d n: %d\n",
291 input_report_abs(input, ABS_TOOL_WIDTH, int2bound(&c->w, w));
292 input_report_abs(input, ABS_X, int2bound(&c->x, x - c->x.devmin));
293 input_report_abs(input, ABS_Y, int2bound(&c->y, c->y.devmax - y));
296 input_report_abs(input, ABS_PRESSURE, int2bound(&c->p, p));
298 input_report_key(input, BTN_TOOL_FINGER, n == 1);
299 input_report_key(input, BTN_TOOL_DOUBLETAP, n == 2);
300 input_report_key(input, BTN_TOOL_TRIPLETAP, n > 2);
307 /* Wellspring initialization constants */
308 #define BCM5974_WELLSPRING_MODE_READ_REQUEST_ID 1
309 #define BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID 9
310 #define BCM5974_WELLSPRING_MODE_REQUEST_VALUE 0x300
311 #define BCM5974_WELLSPRING_MODE_REQUEST_INDEX 0
312 #define BCM5974_WELLSPRING_MODE_VENDOR_VALUE 0x01
314 static int bcm5974_wellspring_mode(struct bcm5974 *dev)
316 char *data = kmalloc(8, GFP_KERNEL);
317 int retval = 0, size;
320 err("bcm5974: out of memory");
325 /* read configuration */
326 size = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
327 BCM5974_WELLSPRING_MODE_READ_REQUEST_ID,
328 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
329 BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
330 BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
333 err("bcm5974: could not read from device");
338 /* apply the mode switch */
339 data[0] = BCM5974_WELLSPRING_MODE_VENDOR_VALUE;
341 /* write configuration */
342 size = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
343 BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID,
344 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
345 BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
346 BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
349 err("bcm5974: could not write to device");
354 dprintk(2, "bcm5974: switched to wellspring mode.\n");
361 static void bcm5974_irq_button(struct urb *urb)
363 struct bcm5974 *dev = urb->context;
366 switch (urb->status) {
373 dbg("bcm5974: button urb shutting down: %d", urb->status);
376 dbg("bcm5974: button urb status: %d", urb->status);
380 if (report_bt_state(dev, dev->bt_urb->actual_length))
381 dprintk(1, "bcm5974: bad button package, length: %d\n",
382 dev->bt_urb->actual_length);
385 error = usb_submit_urb(dev->bt_urb, GFP_ATOMIC);
387 err("bcm5974: button urb failed: %d", error);
390 static void bcm5974_irq_trackpad(struct urb *urb)
392 struct bcm5974 *dev = urb->context;
395 switch (urb->status) {
402 dbg("bcm5974: trackpad urb shutting down: %d", urb->status);
405 dbg("bcm5974: trackpad urb status: %d", urb->status);
409 /* control response ignored */
410 if (dev->tp_urb->actual_length == 2)
413 if (report_tp_state(dev, dev->tp_urb->actual_length))
414 dprintk(1, "bcm5974: bad trackpad package, length: %d\n",
415 dev->tp_urb->actual_length);
418 error = usb_submit_urb(dev->tp_urb, GFP_ATOMIC);
420 err("bcm5974: trackpad urb failed: %d", error);
424 * The Wellspring trackpad, like many recent Apple trackpads, share
425 * the usb device with the keyboard. Since keyboards are usually
426 * handled by the HID system, the device ends up being handled by two
427 * modules. Setting up the device therefore becomes slightly
428 * complicated. To enable multitouch features, a mode switch is
429 * required, which is usually applied via the control interface of the
430 * device. It can be argued where this switch should take place. In
431 * some drivers, like appletouch, the switch is made during
432 * probe. However, the hid module may also alter the state of the
433 * device, resulting in trackpad malfunction under certain
434 * circumstances. To get around this problem, there is at least one
435 * example that utilizes the USB_QUIRK_RESET_RESUME quirk in order to
436 * recieve a reset_resume request rather than the normal resume.
437 * Since the implementation of reset_resume is equal to mode switch
438 * plus start_traffic, it seems easier to always do the switch when
439 * starting traffic on the device.
441 static int bcm5974_start_traffic(struct bcm5974 *dev)
443 if (bcm5974_wellspring_mode(dev)) {
444 dprintk(1, "bcm5974: mode switch failed\n");
448 if (usb_submit_urb(dev->bt_urb, GFP_KERNEL))
451 if (usb_submit_urb(dev->tp_urb, GFP_KERNEL))
457 usb_kill_urb(dev->bt_urb);
462 static void bcm5974_pause_traffic(struct bcm5974 *dev)
464 usb_kill_urb(dev->tp_urb);
465 usb_kill_urb(dev->bt_urb);
469 * The code below implements open/close and manual suspend/resume.
470 * All functions may be called in random order.
472 * Opening a suspended device fails with EACCES - permission denied.
474 * Failing a resume leaves the device resumed but closed.
476 static int bcm5974_open(struct input_dev *input)
478 struct bcm5974 *dev = input_get_drvdata(input);
481 mutex_lock(&dev->pm_mutex);
483 error = bcm5974_start_traffic(dev);
487 mutex_unlock(&dev->pm_mutex);
492 static void bcm5974_close(struct input_dev *input)
494 struct bcm5974 *dev = input_get_drvdata(input);
496 mutex_lock(&dev->pm_mutex);
498 bcm5974_pause_traffic(dev);
501 mutex_unlock(&dev->pm_mutex);
504 static int bcm5974_suspend(struct usb_interface *iface, pm_message_t message)
506 struct bcm5974 *dev = usb_get_intfdata(iface);
508 mutex_lock(&dev->pm_mutex);
511 bcm5974_pause_traffic(dev);
513 mutex_unlock(&dev->pm_mutex);
518 static int bcm5974_resume(struct usb_interface *iface)
520 struct bcm5974 *dev = usb_get_intfdata(iface);
523 mutex_lock(&dev->pm_mutex);
526 error = bcm5974_start_traffic(dev);
528 mutex_unlock(&dev->pm_mutex);
533 static int bcm5974_probe(struct usb_interface *iface,
534 const struct usb_device_id *id)
536 struct usb_device *udev = interface_to_usbdev(iface);
537 const struct bcm5974_config *cfg;
539 struct input_dev *input_dev;
542 /* find the product index */
543 cfg = bcm5974_get_config(udev);
545 /* allocate memory for our device state and initialize it */
546 dev = kzalloc(sizeof(struct bcm5974), GFP_KERNEL);
547 input_dev = input_allocate_device();
548 if (!dev || !input_dev) {
549 err("bcm5974: out of memory");
554 dev->input = input_dev;
556 mutex_init(&dev->pm_mutex);
559 dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL);
563 dev->tp_urb = usb_alloc_urb(0, GFP_KERNEL);
565 goto err_free_bt_urb;
567 dev->bt_data = usb_buffer_alloc(dev->udev,
568 dev->cfg.bt_datalen, GFP_KERNEL,
569 &dev->bt_urb->transfer_dma);
573 dev->tp_data = usb_buffer_alloc(dev->udev,
574 dev->cfg.tp_datalen, GFP_KERNEL,
575 &dev->tp_urb->transfer_dma);
577 goto err_free_bt_buffer;
579 usb_fill_int_urb(dev->bt_urb, udev,
580 usb_rcvintpipe(udev, cfg->bt_ep),
581 dev->bt_data, dev->cfg.bt_datalen,
582 bcm5974_irq_button, dev, 1);
584 usb_fill_int_urb(dev->tp_urb, udev,
585 usb_rcvintpipe(udev, cfg->tp_ep),
586 dev->tp_data, dev->cfg.tp_datalen,
587 bcm5974_irq_trackpad, dev, 1);
589 /* create bcm5974 device */
590 usb_make_path(udev, dev->phys, sizeof(dev->phys));
591 strlcat(dev->phys, "/input0", sizeof(dev->phys));
593 input_dev->name = "bcm5974";
594 input_dev->phys = dev->phys;
595 usb_to_input_id(dev->udev, &input_dev->id);
596 input_dev->dev.parent = &iface->dev;
598 input_set_drvdata(input_dev, dev);
600 input_dev->open = bcm5974_open;
601 input_dev->close = bcm5974_close;
603 setup_events_to_report(input_dev, cfg);
605 error = input_register_device(dev->input);
607 goto err_free_buffer;
609 /* save our data pointer in this interface device */
610 usb_set_intfdata(iface, dev);
615 usb_buffer_free(dev->udev, dev->cfg.tp_datalen,
616 dev->tp_data, dev->tp_urb->transfer_dma);
618 usb_buffer_free(dev->udev, dev->cfg.bt_datalen,
619 dev->bt_data, dev->bt_urb->transfer_dma);
621 usb_free_urb(dev->tp_urb);
623 usb_free_urb(dev->bt_urb);
625 usb_set_intfdata(iface, NULL);
626 input_free_device(input_dev);
631 static void bcm5974_disconnect(struct usb_interface *iface)
633 struct bcm5974 *dev = usb_get_intfdata(iface);
635 usb_set_intfdata(iface, NULL);
637 input_unregister_device(dev->input);
638 usb_buffer_free(dev->udev, dev->cfg.tp_datalen,
639 dev->tp_data, dev->tp_urb->transfer_dma);
640 usb_buffer_free(dev->udev, dev->cfg.bt_datalen,
641 dev->bt_data, dev->bt_urb->transfer_dma);
642 usb_free_urb(dev->tp_urb);
643 usb_free_urb(dev->bt_urb);
647 static struct usb_driver bcm5974_driver = {
649 .probe = bcm5974_probe,
650 .disconnect = bcm5974_disconnect,
651 .suspend = bcm5974_suspend,
652 .resume = bcm5974_resume,
653 .reset_resume = bcm5974_resume,
654 .id_table = bcm5974_table,
657 static int __init bcm5974_init(void)
659 return usb_register(&bcm5974_driver);
662 static void __exit bcm5974_exit(void)
664 usb_deregister(&bcm5974_driver);
667 module_init(bcm5974_init);
668 module_exit(bcm5974_exit);