drivers/input/mouse/bcm5974.c

   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
  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      \
  63 }
  64
  65 /* table of devices that work with this driver */
  66 static const struct usb_device_id bcm5974_table[] = {
  67         /* MacbookAir1.1 */
  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 */
  76         {}
  77 };
  78 MODULE_DEVICE_TABLE(usb, bcm5974_table);
  79
  80 MODULE_AUTHOR("Henrik Rydberg");
  81 MODULE_DESCRIPTION("Apple USB BCM5974 multitouch driver");
  82 MODULE_LICENSE("GPL");
  83
  84 #define dprintk(level, format, a...)\
  85         { if (debug >= level) printk(KERN_DEBUG format, ##a); }
  86
  87 static int debug = 1;
  88 module_param(debug, int, 0644);
  89 MODULE_PARM_DESC(debug, "Activate debugging output");
  90
  91 /* button data structure */
  92 struct bt_data {
  93         u8 unknown1;            /* constant */
  94         u8 button;              /* left button */
  95         u8 rel_x;               /* relative x coordinate */
  96         u8 rel_y;               /* relative y coordinate */
  97 };
  98
  99 /* trackpad header structure */
 100 struct tp_header {
 101         u8 unknown1[16];        /* constants, timers, etc */
 102         u8 fingers;             /* number of fingers on trackpad */
 103         u8 unknown2[9];         /* constants, timers, etc */
 104 };
 105
 106 /* trackpad finger structure */
 107 struct tp_finger {
 108         __le16 origin;          /* zero when switching track finger */
 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 */
 120 };
 121
 122 /* trackpad data structure, empirically at least ten fingers */
 123 struct tp_data {
 124         struct tp_header header;
 125         struct tp_finger finger[16];
 126 };
 127
 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 */
 134 };
 135
 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 */
 147 };
 148
 149 /* logical device structure */
 150 struct bcm5974 {
 151         char phys[64];
 152         struct usb_device *udev;        /* usb device */
 153         struct usb_interface *intf;     /* our interface */
 154         struct input_dev *input;        /* input dev */
 155         struct bcm5974_config cfg;      /* device configuration */
 156         struct mutex pm_mutex;          /* serialize access to open/suspend */
 157         int opened;                     /* 1: opened, 0: closed */
 158         struct urb *bt_urb;             /* button usb request block */
 159         struct bt_data *bt_data;        /* button transferred data */
 160         struct urb *tp_urb;             /* trackpad usb request block */
 161         struct tp_data *tp_data;        /* trackpad transferred data */
 162         int fingers;                    /* number of fingers on trackpad */
 163 };
 164
 165 /* logical dimensions */
 166 #define DIM_PRESSURE    256             /* maximum finger pressure */
 167 #define DIM_WIDTH       16              /* maximum finger width */
 168 #define DIM_X           1280            /* maximum trackpad x value */
 169 #define DIM_Y           800             /* maximum trackpad y value */
 170
 171 /* logical signal quality */
 172 #define SN_PRESSURE     45              /* pressure signal-to-noise ratio */
 173 #define SN_WIDTH        100             /* width signal-to-noise ratio */
 174 #define SN_COORD        250             /* coordinate signal-to-noise ratio */
 175
 176 /* pressure thresholds */
 177 #define PRESSURE_LOW    (2 * DIM_PRESSURE / SN_PRESSURE)
 178 #define PRESSURE_HIGH   (3 * PRESSURE_LOW)
 179
 180 /* device constants */
 181 static const struct bcm5974_config bcm5974_config_table[] = {
 182         {
 183                 USB_DEVICE_ID_APPLE_WELLSPRING_ANSI,
 184                 USB_DEVICE_ID_APPLE_WELLSPRING_ISO,
 185                 USB_DEVICE_ID_APPLE_WELLSPRING_JIS,
 186                 0x84, sizeof(struct bt_data),
 187                 0x81, sizeof(struct tp_data),
 188                 { DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
 189                 { DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
 190                 { DIM_X, DIM_X / SN_COORD, -4824, 5342 },
 191                 { DIM_Y, DIM_Y / SN_COORD, -172, 5820 }
 192         },
 193         {
 194                 USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI,
 195                 USB_DEVICE_ID_APPLE_WELLSPRING2_ISO,
 196                 USB_DEVICE_ID_APPLE_WELLSPRING2_JIS,
 197                 0x84, sizeof(struct bt_data),
 198                 0x81, sizeof(struct tp_data),
 199                 { DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
 200                 { DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
 201                 { DIM_X, DIM_X / SN_COORD, -4824, 4824 },
 202                 { DIM_Y, DIM_Y / SN_COORD, -172, 4290 }
 203         },
 204         {}
 205 };
 206
 207 /* return the device-specific configuration by device */
 208 static const struct bcm5974_config *bcm5974_get_config(struct usb_device *udev)
 209 {
 210         u16 id = le16_to_cpu(udev->descriptor.idProduct);
 211         const struct bcm5974_config *cfg;
 212
 213         for (cfg = bcm5974_config_table; cfg->ansi; ++cfg)
 214                 if (cfg->ansi == id || cfg->iso == id || cfg->jis == id)
 215                         return cfg;
 216
 217         return bcm5974_config_table;
 218 }
 219
 220 /* convert 16-bit little endian to signed integer */
 221 static inline int raw2int(__le16 x)
 222 {
 223         return (signed short)le16_to_cpu(x);
 224 }
 225
 226 /* scale device data to logical dimensions (asserts devmin < devmax) */
 227 static inline int int2scale(const struct bcm5974_param *p, int x)
 228 {
 229         return x * p->dim / (p->devmax - p->devmin);
 230 }
 231
 232 /* all logical value ranges are [0,dim). */
 233 static inline int int2bound(const struct bcm5974_param *p, int x)
 234 {
 235         int s = int2scale(p, x);
 236
 237         return clamp_val(s, 0, p->dim - 1);
 238 }
 239
 240 /* setup which logical events to report */
 241 static void setup_events_to_report(struct input_dev *input_dev,
 242                                    const struct bcm5974_config *cfg)
 243 {
 244         __set_bit(EV_ABS, input_dev->evbit);
 245
 246         input_set_abs_params(input_dev, ABS_PRESSURE,
 247                                 0, cfg->p.dim, cfg->p.fuzz, 0);
 248         input_set_abs_params(input_dev, ABS_TOOL_WIDTH,
 249                                 0, cfg->w.dim, cfg->w.fuzz, 0);
 250         input_set_abs_params(input_dev, ABS_X,
 251                                 0, cfg->x.dim, cfg->x.fuzz, 0);
 252         input_set_abs_params(input_dev, ABS_Y,
 253                                 0, cfg->y.dim, cfg->y.fuzz, 0);
 254
 255         __set_bit(EV_KEY, input_dev->evbit);
 256         __set_bit(BTN_TOUCH, input_dev->keybit);
 257         __set_bit(BTN_TOOL_FINGER, input_dev->keybit);
 258         __set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
 259         __set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
 260         __set_bit(BTN_LEFT, input_dev->keybit);
 261 }
 262
 263 /* report button data as logical button state */
 264 static int report_bt_state(struct bcm5974 *dev, int size)
 265 {
 266         if (size != sizeof(struct bt_data))
 267                 return -EIO;
 268
 269         input_report_key(dev->input, BTN_LEFT, dev->bt_data->button);
 270         input_sync(dev->input);
 271
 272         return 0;
 273 }
 274
 275 /* report trackpad data as logical trackpad state */
 276 static int report_tp_state(struct bcm5974 *dev, int size)
 277 {
 278         const struct bcm5974_config *c = &dev->cfg;
 279         const struct tp_finger *f = dev->tp_data->finger;
 280         struct input_dev *input = dev->input;
 281         const int fingers = (size - 26) / 28;
 282         int raw_p, raw_w, raw_x, raw_y;
 283         int ptest = 0, origin = 0, nmin = 0, nmax = 0;
 284         int abs_p = 0, abs_w = 0, abs_x = 0, abs_y = 0;
 285
 286         if (size < 26 || (size - 26) % 28 != 0)
 287                 return -EIO;
 288
 289         /* always track the first finger; when detached, start over */
 290         if (fingers) {
 291                 raw_p = raw2int(f->force_major);
 292                 raw_w = raw2int(f->size_major);
 293                 raw_x = raw2int(f->abs_x);
 294                 raw_y = raw2int(f->abs_y);
 295
 296                 dprintk(9,
 297                         "bcm5974: raw: p: %+05d w: %+05d x: %+05d y: %+05d\n",
 298                         raw_p, raw_w, raw_x, raw_y);
 299
 300                 ptest = int2bound(&c->p, raw_p);
 301                 origin = raw2int(f->origin);
 302         }
 303
 304         /* while tracking finger still valid, count all fingers */
 305         if (ptest > PRESSURE_LOW && origin) {
 306                 abs_p = ptest;
 307                 abs_w = int2bound(&c->w, raw_w);
 308                 abs_x = int2bound(&c->x, raw_x - c->x.devmin);
 309                 abs_y = int2bound(&c->y, c->y.devmax - raw_y);
 310                 for (; f != dev->tp_data->finger + fingers; f++) {
 311                         ptest = int2bound(&c->p, raw2int(f->force_major));
 312                         if (ptest > PRESSURE_LOW)
 313                                 nmax++;
 314                         if (ptest > PRESSURE_HIGH)
 315                                 nmin++;
 316                 }
 317         }
 318
 319         if (dev->fingers < nmin)
 320                 dev->fingers = nmin;
 321         if (dev->fingers > nmax)
 322                 dev->fingers = nmax;
 323
 324         input_report_key(input, BTN_TOUCH, dev->fingers > 0);
 325         input_report_key(input, BTN_TOOL_FINGER, dev->fingers == 1);
 326         input_report_key(input, BTN_TOOL_DOUBLETAP, dev->fingers == 2);
 327         input_report_key(input, BTN_TOOL_TRIPLETAP, dev->fingers > 2);
 328
 329         input_report_abs(input, ABS_PRESSURE, abs_p);
 330         input_report_abs(input, ABS_TOOL_WIDTH, abs_w);
 331
 332         if (abs_p) {
 333                 input_report_abs(input, ABS_X, abs_x);
 334                 input_report_abs(input, ABS_Y, abs_y);
 335
 336                 dprintk(8,
 337                         "bcm5974: abs: p: %+05d w: %+05d x: %+05d y: %+05d "
 338                         "nmin: %d nmax: %d n: %d\n",
 339                         abs_p, abs_w, abs_x, abs_y, nmin, nmax, dev->fingers);
 340
 341         }
 342
 343         input_sync(input);
 344
 345         return 0;
 346 }
 347
 348 /* Wellspring initialization constants */
 349 #define BCM5974_WELLSPRING_MODE_READ_REQUEST_ID         1
 350 #define BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID        9
 351 #define BCM5974_WELLSPRING_MODE_REQUEST_VALUE           0x300
 352 #define BCM5974_WELLSPRING_MODE_REQUEST_INDEX           0
 353 #define BCM5974_WELLSPRING_MODE_VENDOR_VALUE            0x01
 354 #define BCM5974_WELLSPRING_MODE_NORMAL_VALUE            0x08
 355
 356 static int bcm5974_wellspring_mode(struct bcm5974 *dev, bool on)
 357 {
 358         char *data = kmalloc(8, GFP_KERNEL);
 359         int retval = 0, size;
 360
 361         if (!data) {
 362                 err("bcm5974: out of memory");
 363                 retval = -ENOMEM;
 364                 goto out;
 365         }
 366
 367         /* read configuration */
 368         size = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
 369                         BCM5974_WELLSPRING_MODE_READ_REQUEST_ID,
 370                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 371                         BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
 372                         BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
 373
 374         if (size != 8) {
 375                 err("bcm5974: could not read from device");
 376                 retval = -EIO;
 377                 goto out;
 378         }
 379
 380         /* apply the mode switch */
 381         data[0] = on ?
 382                 BCM5974_WELLSPRING_MODE_VENDOR_VALUE :
 383                 BCM5974_WELLSPRING_MODE_NORMAL_VALUE;
 384
 385         /* write configuration */
 386         size = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
 387                         BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID,
 388                         USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 389                         BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
 390                         BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
 391
 392         if (size != 8) {
 393                 err("bcm5974: could not write to device");
 394                 retval = -EIO;
 395                 goto out;
 396         }
 397
 398         dprintk(2, "bcm5974: switched to %s mode.\n",
 399                 on ? "wellspring" : "normal");
 400
 401  out:
 402         kfree(data);
 403         return retval;
 404 }
 405
 406 static void bcm5974_irq_button(struct urb *urb)
 407 {
 408         struct bcm5974 *dev = urb->context;
 409         int error;
 410
 411         switch (urb->status) {
 412         case 0:
 413                 break;
 414         case -EOVERFLOW:
 415         case -ECONNRESET:
 416         case -ENOENT:
 417         case -ESHUTDOWN:
 418                 dbg("bcm5974: button urb shutting down: %d", urb->status);
 419                 return;
 420         default:
 421                 dbg("bcm5974: button urb status: %d", urb->status);
 422                 goto exit;
 423         }
 424
 425         if (report_bt_state(dev, dev->bt_urb->actual_length))
 426                 dprintk(1, "bcm5974: bad button package, length: %d\n",
 427                         dev->bt_urb->actual_length);
 428
 429 exit:
 430         error = usb_submit_urb(dev->bt_urb, GFP_ATOMIC);
 431         if (error)
 432                 err("bcm5974: button urb failed: %d", error);
 433 }
 434
 435 static void bcm5974_irq_trackpad(struct urb *urb)
 436 {
 437         struct bcm5974 *dev = urb->context;
 438         int error;
 439
 440         switch (urb->status) {
 441         case 0:
 442                 break;
 443         case -EOVERFLOW:
 444         case -ECONNRESET:
 445         case -ENOENT:
 446         case -ESHUTDOWN:
 447                 dbg("bcm5974: trackpad urb shutting down: %d", urb->status);
 448                 return;
 449         default:
 450                 dbg("bcm5974: trackpad urb status: %d", urb->status);
 451                 goto exit;
 452         }
 453
 454         /* control response ignored */
 455         if (dev->tp_urb->actual_length == 2)
 456                 goto exit;
 457
 458         if (report_tp_state(dev, dev->tp_urb->actual_length))
 459                 dprintk(1, "bcm5974: bad trackpad package, length: %d\n",
 460                         dev->tp_urb->actual_length);
 461
 462 exit:
 463         error = usb_submit_urb(dev->tp_urb, GFP_ATOMIC);
 464         if (error)
 465                 err("bcm5974: trackpad urb failed: %d", error);
 466 }
 467
 468 /*
 469  * The Wellspring trackpad, like many recent Apple trackpads, share
 470  * the usb device with the keyboard. Since keyboards are usually
 471  * handled by the HID system, the device ends up being handled by two
 472  * modules. Setting up the device therefore becomes slightly
 473  * complicated. To enable multitouch features, a mode switch is
 474  * required, which is usually applied via the control interface of the
 475  * device.  It can be argued where this switch should take place. In
 476  * some drivers, like appletouch, the switch is made during
 477  * probe. However, the hid module may also alter the state of the
 478  * device, resulting in trackpad malfunction under certain
 479  * circumstances. To get around this problem, there is at least one
 480  * example that utilizes the USB_QUIRK_RESET_RESUME quirk in order to
 481  * recieve a reset_resume request rather than the normal resume.
 482  * Since the implementation of reset_resume is equal to mode switch
 483  * plus start_traffic, it seems easier to always do the switch when
 484  * starting traffic on the device.
 485  */
 486 static int bcm5974_start_traffic(struct bcm5974 *dev)
 487 {
 488         if (bcm5974_wellspring_mode(dev, true)) {
 489                 dprintk(1, "bcm5974: mode switch failed\n");
 490                 goto error;
 491         }
 492
 493         if (usb_submit_urb(dev->bt_urb, GFP_KERNEL))
 494                 goto error;
 495
 496         if (usb_submit_urb(dev->tp_urb, GFP_KERNEL))
 497                 goto err_kill_bt;
 498
 499         return 0;
 500
 501 err_kill_bt:
 502         usb_kill_urb(dev->bt_urb);
 503 error:
 504         return -EIO;
 505 }
 506
 507 static void bcm5974_pause_traffic(struct bcm5974 *dev)
 508 {
 509         usb_kill_urb(dev->tp_urb);
 510         usb_kill_urb(dev->bt_urb);
 511         bcm5974_wellspring_mode(dev, false);
 512 }
 513
 514 /*
 515  * The code below implements open/close and manual suspend/resume.
 516  * All functions may be called in random order.
 517  *
 518  * Opening a suspended device fails with EACCES - permission denied.
 519  *
 520  * Failing a resume leaves the device resumed but closed.
 521  */
 522 static int bcm5974_open(struct input_dev *input)
 523 {
 524         struct bcm5974 *dev = input_get_drvdata(input);
 525         int error;
 526
 527         error = usb_autopm_get_interface(dev->intf);
 528         if (error)
 529                 return error;
 530
 531         mutex_lock(&dev->pm_mutex);
 532
 533         error = bcm5974_start_traffic(dev);
 534         if (!error)
 535                 dev->opened = 1;
 536
 537         mutex_unlock(&dev->pm_mutex);
 538
 539         if (error)
 540                 usb_autopm_put_interface(dev->intf);
 541
 542         return error;
 543 }
 544
 545 static void bcm5974_close(struct input_dev *input)
 546 {
 547         struct bcm5974 *dev = input_get_drvdata(input);
 548
 549         mutex_lock(&dev->pm_mutex);
 550
 551         bcm5974_pause_traffic(dev);
 552         dev->opened = 0;
 553
 554         mutex_unlock(&dev->pm_mutex);
 555
 556         usb_autopm_put_interface(dev->intf);
 557 }
 558
 559 static int bcm5974_suspend(struct usb_interface *iface, pm_message_t message)
 560 {
 561         struct bcm5974 *dev = usb_get_intfdata(iface);
 562
 563         mutex_lock(&dev->pm_mutex);
 564
 565         if (dev->opened)
 566                 bcm5974_pause_traffic(dev);
 567
 568         mutex_unlock(&dev->pm_mutex);
 569
 570         return 0;
 571 }
 572
 573 static int bcm5974_resume(struct usb_interface *iface)
 574 {
 575         struct bcm5974 *dev = usb_get_intfdata(iface);
 576         int error = 0;
 577
 578         mutex_lock(&dev->pm_mutex);
 579
 580         if (dev->opened)
 581                 error = bcm5974_start_traffic(dev);
 582
 583         mutex_unlock(&dev->pm_mutex);
 584
 585         return error;
 586 }
 587
 588 static int bcm5974_probe(struct usb_interface *iface,
 589                          const struct usb_device_id *id)
 590 {
 591         struct usb_device *udev = interface_to_usbdev(iface);
 592         const struct bcm5974_config *cfg;
 593         struct bcm5974 *dev;
 594         struct input_dev *input_dev;
 595         int error = -ENOMEM;
 596
 597         /* find the product index */
 598         cfg = bcm5974_get_config(udev);
 599
 600         /* allocate memory for our device state and initialize it */
 601         dev = kzalloc(sizeof(struct bcm5974), GFP_KERNEL);
 602         input_dev = input_allocate_device();
 603         if (!dev || !input_dev) {
 604                 err("bcm5974: out of memory");
 605                 goto err_free_devs;
 606         }
 607
 608         dev->udev = udev;
 609         dev->intf = iface;
 610         dev->input = input_dev;
 611         dev->cfg = *cfg;
 612         mutex_init(&dev->pm_mutex);
 613
 614         /* setup urbs */
 615         dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL);
 616         if (!dev->bt_urb)
 617                 goto err_free_devs;
 618
 619         dev->tp_urb = usb_alloc_urb(0, GFP_KERNEL);
 620         if (!dev->tp_urb)
 621                 goto err_free_bt_urb;
 622
 623         dev->bt_data = usb_buffer_alloc(dev->udev,
 624                                         dev->cfg.bt_datalen, GFP_KERNEL,
 625                                         &dev->bt_urb->transfer_dma);
 626         if (!dev->bt_data)
 627                 goto err_free_urb;
 628
 629         dev->tp_data = usb_buffer_alloc(dev->udev,
 630                                         dev->cfg.tp_datalen, GFP_KERNEL,
 631                                         &dev->tp_urb->transfer_dma);
 632         if (!dev->tp_data)
 633                 goto err_free_bt_buffer;
 634
 635         usb_fill_int_urb(dev->bt_urb, udev,
 636                          usb_rcvintpipe(udev, cfg->bt_ep),
 637                          dev->bt_data, dev->cfg.bt_datalen,
 638                          bcm5974_irq_button, dev, 1);
 639
 640         usb_fill_int_urb(dev->tp_urb, udev,
 641                          usb_rcvintpipe(udev, cfg->tp_ep),
 642                          dev->tp_data, dev->cfg.tp_datalen,
 643                          bcm5974_irq_trackpad, dev, 1);
 644
 645         /* create bcm5974 device */
 646         usb_make_path(udev, dev->phys, sizeof(dev->phys));
 647         strlcat(dev->phys, "/input0", sizeof(dev->phys));
 648
 649         input_dev->name = "bcm5974";
 650         input_dev->phys = dev->phys;
 651         usb_to_input_id(dev->udev, &input_dev->id);
 652         input_dev->dev.parent = &iface->dev;
 653
 654         input_set_drvdata(input_dev, dev);
 655
 656         input_dev->open = bcm5974_open;
 657         input_dev->close = bcm5974_close;
 658
 659         setup_events_to_report(input_dev, cfg);
 660
 661         error = input_register_device(dev->input);
 662         if (error)
 663                 goto err_free_buffer;
 664
 665         /* save our data pointer in this interface device */
 666         usb_set_intfdata(iface, dev);
 667
 668         return 0;
 669
 670 err_free_buffer:
 671         usb_buffer_free(dev->udev, dev->cfg.tp_datalen,
 672                 dev->tp_data, dev->tp_urb->transfer_dma);
 673 err_free_bt_buffer:
 674         usb_buffer_free(dev->udev, dev->cfg.bt_datalen,
 675                 dev->bt_data, dev->bt_urb->transfer_dma);
 676 err_free_urb:
 677         usb_free_urb(dev->tp_urb);
 678 err_free_bt_urb:
 679         usb_free_urb(dev->bt_urb);
 680 err_free_devs:
 681         usb_set_intfdata(iface, NULL);
 682         input_free_device(input_dev);
 683         kfree(dev);
 684         return error;
 685 }
 686
 687 static void bcm5974_disconnect(struct usb_interface *iface)
 688 {
 689         struct bcm5974 *dev = usb_get_intfdata(iface);
 690
 691         usb_set_intfdata(iface, NULL);
 692
 693         input_unregister_device(dev->input);
 694         usb_buffer_free(dev->udev, dev->cfg.tp_datalen,
 695                         dev->tp_data, dev->tp_urb->transfer_dma);
 696         usb_buffer_free(dev->udev, dev->cfg.bt_datalen,
 697                         dev->bt_data, dev->bt_urb->transfer_dma);
 698         usb_free_urb(dev->tp_urb);
 699         usb_free_urb(dev->bt_urb);
 700         kfree(dev);
 701 }
 702
 703 static struct usb_driver bcm5974_driver = {
 704         .name                   = "bcm5974",
 705         .probe                  = bcm5974_probe,
 706         .disconnect             = bcm5974_disconnect,
 707         .suspend                = bcm5974_suspend,
 708         .resume                 = bcm5974_resume,
 709         .reset_resume           = bcm5974_resume,
 710         .id_table               = bcm5974_table,
 711         .supports_autosuspend   = 1,
 712 };
 713
 714 static int __init bcm5974_init(void)
 715 {
 716         return usb_register(&bcm5974_driver);
 717 }
 718
 719 static void __exit bcm5974_exit(void)
 720 {
 721         usb_deregister(&bcm5974_driver);
 722 }
 723
 724 module_init(bcm5974_init);
 725 module_exit(bcm5974_exit);
 726