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