2 * Apple USB Touchpad (for post-February 2005 PowerBooks) driver
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 * Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch)
11 * Thanks to Alex Harper <basilisk@foobox.net> for his inputs.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/config.h>
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/init.h>
33 #include <linux/slab.h>
34 #include <linux/module.h>
35 #include <linux/usb.h>
36 #include <linux/input.h>
37 #include <linux/usb_input.h>
39 /* Apple has powerbooks which have the keyboard with different Product IDs */
40 #define APPLE_VENDOR_ID 0x05AC
42 /* These names come from Info.plist in AppleUSBTrackpad.kext */
43 #define GEYSER_ANSI_PRODUCT_ID 0x0214
44 #define GEYSER_ISO_PRODUCT_ID 0x0215
45 #define GEYSER_JIS_PRODUCT_ID 0x0216
47 #define ATP_DEVICE(prod) \
48 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
49 USB_DEVICE_ID_MATCH_INT_CLASS | \
50 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
51 .idVendor = APPLE_VENDOR_ID, \
52 .idProduct = (prod), \
53 .bInterfaceClass = 0x03, \
54 .bInterfaceProtocol = 0x02
56 /* table of devices that work with this driver */
57 static struct usb_device_id atp_table [] = {
58 { ATP_DEVICE(0x020E) },
59 { ATP_DEVICE(0x020F) },
60 { ATP_DEVICE(0x030A) },
61 { ATP_DEVICE(0x030B) },
63 /* PowerBooks Oct 2005 */
64 { ATP_DEVICE(GEYSER_ANSI_PRODUCT_ID) },
65 { ATP_DEVICE(GEYSER_ISO_PRODUCT_ID) },
66 { ATP_DEVICE(GEYSER_JIS_PRODUCT_ID) },
68 /* Terminating entry */
71 MODULE_DEVICE_TABLE (usb, atp_table);
74 * number of sensors. Note that only 16 instead of 26 X (horizontal)
75 * sensors exist on 12" and 15" PowerBooks. All models have 16 Y
78 #define ATP_XSENSORS 26
79 #define ATP_YSENSORS 16
81 /* amount of fuzz this touchpad generates */
84 /* maximum pressure this driver will report */
85 #define ATP_PRESSURE 300
87 * multiplication factor for the X and Y coordinates.
88 * We try to keep the touchpad aspect ratio while still doing only simple
90 * The factors below give coordinates like:
91 * 0 <= x < 960 on 12" and 15" Powerbooks
92 * 0 <= x < 1600 on 17" Powerbooks
99 * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is
102 #define ATP_THRESHOLD 5
104 /* Structure to hold all of our device specific stuff */
107 struct usb_device * udev; /* usb device */
108 struct urb * urb; /* usb request block */
109 signed char * data; /* transferred data */
110 int open; /* non-zero if opened */
111 struct input_dev *input; /* input dev */
112 int valid; /* are the sensors valid ? */
113 int x_old; /* last reported x/y, */
114 int y_old; /* used for smoothing */
115 /* current value of the sensors */
116 signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS];
117 /* last value of the sensors */
118 signed char xy_old[ATP_XSENSORS + ATP_YSENSORS];
119 /* accumulated sensors */
120 int xy_acc[ATP_XSENSORS + ATP_YSENSORS];
121 int overflowwarn; /* overflow warning printed? */
122 int datalen; /* size of an USB urb transfer */
125 #define dbg_dump(msg, tab) \
128 printk("appletouch: %s %lld", msg, (long long)jiffies); \
129 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) \
130 printk(" %02x", tab[i]); \
134 #define dprintk(format, a...) \
136 if (debug) printk(format, ##a); \
139 MODULE_AUTHOR("Johannes Berg, Stelian Pop, Frank Arnold, Michael Hanselmann");
140 MODULE_DESCRIPTION("Apple PowerBooks USB touchpad driver");
141 MODULE_LICENSE("GPL");
143 static int debug = 1;
144 module_param(debug, int, 0644);
145 MODULE_PARM_DESC(debug, "Activate debugging output");
147 /* Checks if the device a Geyser 2 (ANSI, ISO, JIS) */
148 static inline int atp_is_geyser_2(struct atp *dev)
150 int16_t productId = le16_to_cpu(dev->udev->descriptor.idProduct);
152 return (productId == GEYSER_ANSI_PRODUCT_ID) ||
153 (productId == GEYSER_ISO_PRODUCT_ID) ||
154 (productId == GEYSER_JIS_PRODUCT_ID);
157 static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
158 int *z, int *fingers)
161 /* values to calculate mean */
162 int pcum = 0, psum = 0;
166 for (i = 0; i < nb_sensors; i++) {
167 if (xy_sensors[i] < ATP_THRESHOLD)
169 if ((i - 1 < 0) || (xy_sensors[i - 1] < ATP_THRESHOLD))
171 pcum += xy_sensors[i] * i;
172 psum += xy_sensors[i];
177 return pcum * fact / psum;
183 static inline void atp_report_fingers(struct input_dev *input, int fingers)
185 input_report_key(input, BTN_TOOL_FINGER, fingers == 1);
186 input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2);
187 input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
190 static void atp_complete(struct urb* urb, struct pt_regs* regs)
192 int x, y, x_z, y_z, x_f, y_f;
194 struct atp *dev = urb->context;
196 switch (urb->status) {
201 if(!dev->overflowwarn) {
202 printk("appletouch: OVERFLOW with data "
203 "length %d, actual length is %d\n",
204 dev->datalen, dev->urb->actual_length);
205 dev->overflowwarn = 1;
210 /* This urb is terminated, clean up */
211 dbg("%s - urb shutting down with status: %d",
212 __FUNCTION__, urb->status);
215 dbg("%s - nonzero urb status received: %d",
216 __FUNCTION__, urb->status);
220 /* drop incomplete datasets */
221 if (dev->urb->actual_length != dev->datalen) {
222 dprintk("appletouch: incomplete data package.\n");
226 /* reorder the sensors values */
227 if (atp_is_geyser_2(dev)) {
228 memset(dev->xy_cur, 0, sizeof(dev->xy_cur));
231 * The values are laid out like this:
232 * Y1, Y2, -, Y3, Y4, -, ..., X1, X2, -, X3, X4, -, ...
233 * '-' is an unused value.
237 for (i = 0, j = 19; i < 20; i += 2, j += 3) {
238 dev->xy_cur[i] = dev->data[j];
239 dev->xy_cur[i + 1] = dev->data[j + 1];
243 for (i = 0, j = 1; i < 9; i += 2, j += 3) {
244 dev->xy_cur[ATP_XSENSORS + i] = dev->data[j];
245 dev->xy_cur[ATP_XSENSORS + i + 1] = dev->data[j + 1];
248 for (i = 0; i < 8; i++) {
250 dev->xy_cur[i ] = dev->data[5 * i + 2];
251 dev->xy_cur[i + 8] = dev->data[5 * i + 4];
252 dev->xy_cur[i + 16] = dev->data[5 * i + 42];
254 dev->xy_cur[i + 24] = dev->data[5 * i + 44];
257 dev->xy_cur[i + 26] = dev->data[5 * i + 1];
258 dev->xy_cur[i + 34] = dev->data[5 * i + 3];
262 dbg_dump("sample", dev->xy_cur);
267 dev->x_old = dev->y_old = -1;
268 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
270 /* 17" Powerbooks have extra X sensors */
271 for (i = (atp_is_geyser_2(dev)?15:16); i < ATP_XSENSORS; i++) {
272 if (!dev->xy_cur[i]) continue;
274 printk("appletouch: 17\" model detected.\n");
275 if(atp_is_geyser_2(dev))
276 input_set_abs_params(dev->input, ABS_X, 0,
281 input_set_abs_params(dev->input, ABS_X, 0,
292 for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
293 /* accumulate the change */
294 signed char change = dev->xy_old[i] - dev->xy_cur[i];
295 dev->xy_acc[i] -= change;
297 /* prevent down drifting */
298 if (dev->xy_acc[i] < 0)
302 memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
304 dbg_dump("accumulator", dev->xy_acc);
306 x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
307 ATP_XFACT, &x_z, &x_f);
308 y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
309 ATP_YFACT, &y_z, &y_f);
312 if (dev->x_old != -1) {
313 x = (dev->x_old * 3 + x) >> 2;
314 y = (dev->y_old * 3 + y) >> 2;
319 printk("appletouch: X: %3d Y: %3d "
323 input_report_key(dev->input, BTN_TOUCH, 1);
324 input_report_abs(dev->input, ABS_X, x);
325 input_report_abs(dev->input, ABS_Y, y);
326 input_report_abs(dev->input, ABS_PRESSURE,
327 min(ATP_PRESSURE, x_z + y_z));
328 atp_report_fingers(dev->input, max(x_f, y_f));
335 dev->x_old = dev->y_old = -1;
336 input_report_key(dev->input, BTN_TOUCH, 0);
337 input_report_abs(dev->input, ABS_PRESSURE, 0);
338 atp_report_fingers(dev->input, 0);
340 /* reset the accumulator on release */
341 memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
344 input_report_key(dev->input, BTN_LEFT,
345 !!dev->data[dev->datalen - 1]);
347 input_sync(dev->input);
350 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
352 err("%s - usb_submit_urb failed with result %d",
353 __FUNCTION__, retval);
357 static int atp_open(struct input_dev *input)
359 struct atp *dev = input->private;
361 if (usb_submit_urb(dev->urb, GFP_ATOMIC))
368 static void atp_close(struct input_dev *input)
370 struct atp *dev = input->private;
372 usb_kill_urb(dev->urb);
376 static int atp_probe(struct usb_interface *iface, const struct usb_device_id *id)
379 struct input_dev *input_dev;
380 struct usb_device *udev = interface_to_usbdev(iface);
381 struct usb_host_interface *iface_desc;
382 struct usb_endpoint_descriptor *endpoint;
383 int int_in_endpointAddr = 0;
384 int i, retval = -ENOMEM;
387 /* set up the endpoint information */
388 /* use only the first interrupt-in endpoint */
389 iface_desc = iface->cur_altsetting;
390 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
391 endpoint = &iface_desc->endpoint[i].desc;
392 if (!int_in_endpointAddr &&
393 (endpoint->bEndpointAddress & USB_DIR_IN) &&
394 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
395 == USB_ENDPOINT_XFER_INT)) {
396 /* we found an interrupt in endpoint */
397 int_in_endpointAddr = endpoint->bEndpointAddress;
401 if (!int_in_endpointAddr) {
402 err("Could not find int-in endpoint");
406 /* allocate memory for our device state and initialize it */
407 dev = kzalloc(sizeof(struct atp), GFP_KERNEL);
408 input_dev = input_allocate_device();
409 if (!dev || !input_dev) {
410 err("Out of memory");
415 dev->input = input_dev;
416 dev->overflowwarn = 0;
417 dev->datalen = (atp_is_geyser_2(dev)?64:81);
419 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
425 dev->data = usb_buffer_alloc(dev->udev, dev->datalen, GFP_KERNEL,
426 &dev->urb->transfer_dma);
432 usb_fill_int_urb(dev->urb, udev,
433 usb_rcvintpipe(udev, int_in_endpointAddr),
434 dev->data, dev->datalen, atp_complete, dev, 1);
436 usb_make_path(udev, dev->phys, sizeof(dev->phys));
437 strlcat(dev->phys, "/input0", sizeof(dev->phys));
439 input_dev->name = "appletouch";
440 input_dev->phys = dev->phys;
441 usb_to_input_id(dev->udev, &input_dev->id);
442 input_dev->cdev.dev = &iface->dev;
444 input_dev->private = dev;
445 input_dev->open = atp_open;
446 input_dev->close = atp_close;
448 set_bit(EV_ABS, input_dev->evbit);
450 if (atp_is_geyser_2(dev)) {
452 * Oct 2005 15" PowerBooks have 15 X sensors, 17" are detected
455 input_set_abs_params(input_dev, ABS_X, 0,
456 ((15 - 1) * ATP_XFACT) - 1, ATP_FUZZ, 0);
457 input_set_abs_params(input_dev, ABS_Y, 0,
458 ((9 - 1) * ATP_YFACT) - 1, ATP_FUZZ, 0);
461 * 12" and 15" Powerbooks only have 16 x sensors,
462 * 17" models are detected later.
464 input_set_abs_params(input_dev, ABS_X, 0,
465 (16 - 1) * ATP_XFACT - 1, ATP_FUZZ, 0);
466 input_set_abs_params(input_dev, ABS_Y, 0,
467 (ATP_YSENSORS - 1) * ATP_YFACT - 1, ATP_FUZZ, 0);
469 input_set_abs_params(input_dev, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0);
471 set_bit(EV_KEY, input_dev->evbit);
472 set_bit(BTN_TOUCH, input_dev->keybit);
473 set_bit(BTN_TOOL_FINGER, input_dev->keybit);
474 set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
475 set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
476 set_bit(BTN_LEFT, input_dev->keybit);
478 input_register_device(dev->input);
480 /* save our data pointer in this interface device */
481 usb_set_intfdata(iface, dev);
486 usb_free_urb(dev->urb);
488 usb_set_intfdata(iface, NULL);
490 input_free_device(input_dev);
494 static void atp_disconnect(struct usb_interface *iface)
496 struct atp *dev = usb_get_intfdata(iface);
498 usb_set_intfdata(iface, NULL);
500 usb_kill_urb(dev->urb);
501 input_unregister_device(dev->input);
502 usb_free_urb(dev->urb);
503 usb_buffer_free(dev->udev, dev->datalen,
504 dev->data, dev->urb->transfer_dma);
507 printk(KERN_INFO "input: appletouch disconnected\n");
510 static int atp_suspend(struct usb_interface *iface, pm_message_t message)
512 struct atp *dev = usb_get_intfdata(iface);
513 usb_kill_urb(dev->urb);
518 static int atp_resume(struct usb_interface *iface)
520 struct atp *dev = usb_get_intfdata(iface);
521 if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
527 static struct usb_driver atp_driver = {
528 .name = "appletouch",
530 .disconnect = atp_disconnect,
531 .suspend = atp_suspend,
532 .resume = atp_resume,
533 .id_table = atp_table,
536 static int __init atp_init(void)
538 return usb_register(&atp_driver);
541 static void __exit atp_exit(void)
543 usb_deregister(&atp_driver);
546 module_init(atp_init);
547 module_exit(atp_exit);