drivers/input/misc/powermate.c

   1 /*
   2  * A driver for the Griffin Technology, Inc. "PowerMate" USB controller dial.
   3  *
   4  * v1.1, (c)2002 William R Sowerbutts <will@sowerbutts.com>
   5  *
   6  * This device is a anodised aluminium knob which connects over USB. It can measure
   7  * clockwise and anticlockwise rotation. The dial also acts as a pushbutton with
   8  * a spring for automatic release. The base contains a pair of LEDs which illuminate
   9  * the translucent base. It rotates without limit and reports its relative rotation
  10  * back to the host when polled by the USB controller.
  11  *
  12  * Testing with the knob I have has shown that it measures approximately 94 "clicks"
  13  * for one full rotation. Testing with my High Speed Rotation Actuator (ok, it was
  14  * a variable speed cordless electric drill) has shown that the device can measure
  15  * speeds of up to 7 clicks either clockwise or anticlockwise between pollings from
  16  * the host. If it counts more than 7 clicks before it is polled, it will wrap back
  17  * to zero and start counting again. This was at quite high speed, however, almost
  18  * certainly faster than the human hand could turn it. Griffin say that it loses a
  19  * pulse or two on a direction change; the granularity is so fine that I never
  20  * noticed this in practice.
  21  *
  22  * The device's microcontroller can be programmed to set the LED to either a constant
  23  * intensity, or to a rhythmic pulsing. Several patterns and speeds are available.
  24  *
  25  * Griffin were very happy to provide documentation and free hardware for development.
  26  *
  27  * Some userspace tools are available on the web: http://sowerbutts.com/powermate/
  28  *
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/usb/input.h>
  37
  38 #define POWERMATE_VENDOR        0x077d  /* Griffin Technology, Inc. */
  39 #define POWERMATE_PRODUCT_NEW   0x0410  /* Griffin PowerMate */
  40 #define POWERMATE_PRODUCT_OLD   0x04AA  /* Griffin soundKnob */
  41
  42 #define CONTOUR_VENDOR          0x05f3  /* Contour Design, Inc. */
  43 #define CONTOUR_JOG             0x0240  /* Jog and Shuttle */
  44
  45 /* these are the command codes we send to the device */
  46 #define SET_STATIC_BRIGHTNESS  0x01
  47 #define SET_PULSE_ASLEEP       0x02
  48 #define SET_PULSE_AWAKE        0x03
  49 #define SET_PULSE_MODE         0x04
  50
  51 /* these refer to bits in the powermate_device's requires_update field. */
  52 #define UPDATE_STATIC_BRIGHTNESS (1<<0)
  53 #define UPDATE_PULSE_ASLEEP      (1<<1)
  54 #define UPDATE_PULSE_AWAKE       (1<<2)
  55 #define UPDATE_PULSE_MODE        (1<<3)
  56
  57 /* at least two versions of the hardware exist, with differing payload
  58    sizes. the first three bytes always contain the "interesting" data in
  59    the relevant format. */
  60 #define POWERMATE_PAYLOAD_SIZE_MAX 6
  61 #define POWERMATE_PAYLOAD_SIZE_MIN 3
  62 struct powermate_device {
  63         signed char *data;
  64         dma_addr_t data_dma;
  65         struct urb *irq, *config;
  66         struct usb_ctrlrequest *configcr;
  67         struct usb_device *udev;
  68         struct input_dev *input;
  69         spinlock_t lock;
  70         int static_brightness;
  71         int pulse_speed;
  72         int pulse_table;
  73         int pulse_asleep;
  74         int pulse_awake;
  75         int requires_update; // physical settings which are out of sync
  76         char phys[64];
  77 };
  78
  79 static char pm_name_powermate[] = "Griffin PowerMate";
  80 static char pm_name_soundknob[] = "Griffin SoundKnob";
  81
  82 static void powermate_config_complete(struct urb *urb);
  83
  84 /* Callback for data arriving from the PowerMate over the USB interrupt pipe */
  85 static void powermate_irq(struct urb *urb)
  86 {
  87         struct powermate_device *pm = urb->context;
  88         int retval;
  89
  90         switch (urb->status) {
  91         case 0:
  92                 /* success */
  93                 break;
  94         case -ECONNRESET:
  95         case -ENOENT:
  96         case -ESHUTDOWN:
  97                 /* this urb is terminated, clean up */
  98                 dbg("%s - urb shutting down with status: %d", __func__, urb->status);
  99                 return;
 100         default:
 101                 dbg("%s - nonzero urb status received: %d", __func__, urb->status);
 102                 goto exit;
 103         }
 104
 105         /* handle updates to device state */
 106         input_report_key(pm->input, BTN_0, pm->data[0] & 0x01);
 107         input_report_rel(pm->input, REL_DIAL, pm->data[1]);
 108         input_sync(pm->input);
 109
 110 exit:
 111         retval = usb_submit_urb (urb, GFP_ATOMIC);
 112         if (retval)
 113                 err ("%s - usb_submit_urb failed with result %d",
 114                      __func__, retval);
 115 }
 116
 117 /* Decide if we need to issue a control message and do so. Must be called with pm->lock taken */
 118 static void powermate_sync_state(struct powermate_device *pm)
 119 {
 120         if (pm->requires_update == 0)
 121                 return; /* no updates are required */
 122         if (pm->config->status == -EINPROGRESS)
 123                 return; /* an update is already in progress; it'll issue this update when it completes */
 124
 125         if (pm->requires_update & UPDATE_PULSE_ASLEEP){
 126                 pm->configcr->wValue = cpu_to_le16( SET_PULSE_ASLEEP );
 127                 pm->configcr->wIndex = cpu_to_le16( pm->pulse_asleep ? 1 : 0 );
 128                 pm->requires_update &= ~UPDATE_PULSE_ASLEEP;
 129         }else if (pm->requires_update & UPDATE_PULSE_AWAKE){
 130                 pm->configcr->wValue = cpu_to_le16( SET_PULSE_AWAKE );
 131                 pm->configcr->wIndex = cpu_to_le16( pm->pulse_awake ? 1 : 0 );
 132                 pm->requires_update &= ~UPDATE_PULSE_AWAKE;
 133         }else if (pm->requires_update & UPDATE_PULSE_MODE){
 134                 int op, arg;
 135                 /* the powermate takes an operation and an argument for its pulse algorithm.
 136                    the operation can be:
 137                    0: divide the speed
 138                    1: pulse at normal speed
 139                    2: multiply the speed
 140                    the argument only has an effect for operations 0 and 2, and ranges between
 141                    1 (least effect) to 255 (maximum effect).
 142
 143                    thus, several states are equivalent and are coalesced into one state.
 144
 145                    we map this onto a range from 0 to 510, with:
 146                    0 -- 254    -- use divide (0 = slowest)
 147                    255         -- use normal speed
 148                    256 -- 510  -- use multiple (510 = fastest).
 149
 150                    Only values of 'arg' quite close to 255 are particularly useful/spectacular.
 151                 */
 152                 if (pm->pulse_speed < 255) {
 153                         op = 0;                   // divide
 154                         arg = 255 - pm->pulse_speed;
 155                 } else if (pm->pulse_speed > 255) {
 156                         op = 2;                   // multiply
 157                         arg = pm->pulse_speed - 255;
 158                 } else {
 159                         op = 1;                   // normal speed
 160                         arg = 0;                  // can be any value
 161                 }
 162                 pm->configcr->wValue = cpu_to_le16( (pm->pulse_table << 8) | SET_PULSE_MODE );
 163                 pm->configcr->wIndex = cpu_to_le16( (arg << 8) | op );
 164                 pm->requires_update &= ~UPDATE_PULSE_MODE;
 165         } else if (pm->requires_update & UPDATE_STATIC_BRIGHTNESS) {
 166                 pm->configcr->wValue = cpu_to_le16( SET_STATIC_BRIGHTNESS );
 167                 pm->configcr->wIndex = cpu_to_le16( pm->static_brightness );
 168                 pm->requires_update &= ~UPDATE_STATIC_BRIGHTNESS;
 169         } else {
 170                 printk(KERN_ERR "powermate: unknown update required");
 171                 pm->requires_update = 0; /* fudge the bug */
 172                 return;
 173         }
 174
 175 /*      printk("powermate: %04x %04x\n", pm->configcr->wValue, pm->configcr->wIndex); */
 176
 177         pm->configcr->bRequestType = 0x41; /* vendor request */
 178         pm->configcr->bRequest = 0x01;
 179         pm->configcr->wLength = 0;
 180
 181         usb_fill_control_urb(pm->config, pm->udev, usb_sndctrlpipe(pm->udev, 0),
 182                              (void *) pm->configcr, NULL, 0,
 183                              powermate_config_complete, pm);
 184
 185         if (usb_submit_urb(pm->config, GFP_ATOMIC))
 186                 printk(KERN_ERR "powermate: usb_submit_urb(config) failed");
 187 }
 188
 189 /* Called when our asynchronous control message completes. We may need to issue another immediately */
 190 static void powermate_config_complete(struct urb *urb)
 191 {
 192         struct powermate_device *pm = urb->context;
 193         unsigned long flags;
 194
 195         if (urb->status)
 196                 printk(KERN_ERR "powermate: config urb returned %d\n", urb->status);
 197
 198         spin_lock_irqsave(&pm->lock, flags);
 199         powermate_sync_state(pm);
 200         spin_unlock_irqrestore(&pm->lock, flags);
 201 }
 202
 203 /* Set the LED up as described and begin the sync with the hardware if required */
 204 static void powermate_pulse_led(struct powermate_device *pm, int static_brightness, int pulse_speed,
 205                                 int pulse_table, int pulse_asleep, int pulse_awake)
 206 {
 207         unsigned long flags;
 208
 209         if (pulse_speed < 0)
 210                 pulse_speed = 0;
 211         if (pulse_table < 0)
 212                 pulse_table = 0;
 213         if (pulse_speed > 510)
 214                 pulse_speed = 510;
 215         if (pulse_table > 2)
 216                 pulse_table = 2;
 217
 218         pulse_asleep = !!pulse_asleep;
 219         pulse_awake = !!pulse_awake;
 220
 221
 222         spin_lock_irqsave(&pm->lock, flags);
 223
 224         /* mark state updates which are required */
 225         if (static_brightness != pm->static_brightness) {
 226                 pm->static_brightness = static_brightness;
 227                 pm->requires_update |= UPDATE_STATIC_BRIGHTNESS;
 228         }
 229         if (pulse_asleep != pm->pulse_asleep) {
 230                 pm->pulse_asleep = pulse_asleep;
 231                 pm->requires_update |= (UPDATE_PULSE_ASLEEP | UPDATE_STATIC_BRIGHTNESS);
 232         }
 233         if (pulse_awake != pm->pulse_awake) {
 234                 pm->pulse_awake = pulse_awake;
 235                 pm->requires_update |= (UPDATE_PULSE_AWAKE | UPDATE_STATIC_BRIGHTNESS);
 236         }
 237         if (pulse_speed != pm->pulse_speed || pulse_table != pm->pulse_table) {
 238                 pm->pulse_speed = pulse_speed;
 239                 pm->pulse_table = pulse_table;
 240                 pm->requires_update |= UPDATE_PULSE_MODE;
 241         }
 242
 243         powermate_sync_state(pm);
 244
 245         spin_unlock_irqrestore(&pm->lock, flags);
 246 }
 247
 248 /* Callback from the Input layer when an event arrives from userspace to configure the LED */
 249 static int powermate_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int _value)
 250 {
 251         unsigned int command = (unsigned int)_value;
 252         struct powermate_device *pm = input_get_drvdata(dev);
 253
 254         if (type == EV_MSC && code == MSC_PULSELED){
 255                 /*
 256                     bits  0- 7: 8 bits: LED brightness
 257                     bits  8-16: 9 bits: pulsing speed modifier (0 ... 510); 0-254 = slower, 255 = standard, 256-510 = faster.
 258                     bits 17-18: 2 bits: pulse table (0, 1, 2 valid)
 259                     bit     19: 1 bit : pulse whilst asleep?
 260                     bit     20: 1 bit : pulse constantly?
 261                 */
 262                 int static_brightness = command & 0xFF;   // bits 0-7
 263                 int pulse_speed = (command >> 8) & 0x1FF; // bits 8-16
 264                 int pulse_table = (command >> 17) & 0x3;  // bits 17-18
 265                 int pulse_asleep = (command >> 19) & 0x1; // bit 19
 266                 int pulse_awake  = (command >> 20) & 0x1; // bit 20
 267
 268                 powermate_pulse_led(pm, static_brightness, pulse_speed, pulse_table, pulse_asleep, pulse_awake);
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int powermate_alloc_buffers(struct usb_device *udev, struct powermate_device *pm)
 275 {
 276         pm->data = usb_alloc_coherent(udev, POWERMATE_PAYLOAD_SIZE_MAX,
 277                                       GFP_ATOMIC, &pm->data_dma);
 278         if (!pm->data)
 279                 return -1;
 280
 281         pm->configcr = kmalloc(sizeof(*(pm->configcr)), GFP_KERNEL);
 282         if (!pm->configcr)
 283                 return -1;
 284
 285         return 0;
 286 }
 287
 288 static void powermate_free_buffers(struct usb_device *udev, struct powermate_device *pm)
 289 {
 290         usb_free_coherent(udev, POWERMATE_PAYLOAD_SIZE_MAX,
 291                           pm->data, pm->data_dma);
 292         kfree(pm->configcr);
 293 }
 294
 295 /* Called whenever a USB device matching one in our supported devices table is connected */
 296 static int powermate_probe(struct usb_interface *intf, const struct usb_device_id *id)
 297 {
 298         struct usb_device *udev = interface_to_usbdev (intf);
 299         struct usb_host_interface *interface;
 300         struct usb_endpoint_descriptor *endpoint;
 301         struct powermate_device *pm;
 302         struct input_dev *input_dev;
 303         int pipe, maxp;
 304         int error = -ENOMEM;
 305
 306         interface = intf->cur_altsetting;
 307         endpoint = &interface->endpoint[0].desc;
 308         if (!usb_endpoint_is_int_in(endpoint))
 309                 return -EIO;
 310
 311         usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 312                 0x0a, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 313                 0, interface->desc.bInterfaceNumber, NULL, 0,
 314                 USB_CTRL_SET_TIMEOUT);
 315
 316         pm = kzalloc(sizeof(struct powermate_device), GFP_KERNEL);
 317         input_dev = input_allocate_device();
 318         if (!pm || !input_dev)
 319                 goto fail1;
 320
 321         if (powermate_alloc_buffers(udev, pm))
 322                 goto fail2;
 323
 324         pm->irq = usb_alloc_urb(0, GFP_KERNEL);
 325         if (!pm->irq)
 326                 goto fail2;
 327
 328         pm->config = usb_alloc_urb(0, GFP_KERNEL);
 329         if (!pm->config)
 330                 goto fail3;
 331
 332         pm->udev = udev;
 333         pm->input = input_dev;
 334
 335         usb_make_path(udev, pm->phys, sizeof(pm->phys));
 336         strlcat(pm->phys, "/input0", sizeof(pm->phys));
 337
 338         spin_lock_init(&pm->lock);
 339
 340         switch (le16_to_cpu(udev->descriptor.idProduct)) {
 341         case POWERMATE_PRODUCT_NEW:
 342                 input_dev->name = pm_name_powermate;
 343                 break;
 344         case POWERMATE_PRODUCT_OLD:
 345                 input_dev->name = pm_name_soundknob;
 346                 break;
 347         default:
 348                 input_dev->name = pm_name_soundknob;
 349                 printk(KERN_WARNING "powermate: unknown product id %04x\n",
 350                        le16_to_cpu(udev->descriptor.idProduct));
 351         }
 352
 353         input_dev->phys = pm->phys;
 354         usb_to_input_id(udev, &input_dev->id);
 355         input_dev->dev.parent = &intf->dev;
 356
 357         input_set_drvdata(input_dev, pm);
 358
 359         input_dev->event = powermate_input_event;
 360
 361         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) |
 362                 BIT_MASK(EV_MSC);
 363         input_dev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);
 364         input_dev->relbit[BIT_WORD(REL_DIAL)] = BIT_MASK(REL_DIAL);
 365         input_dev->mscbit[BIT_WORD(MSC_PULSELED)] = BIT_MASK(MSC_PULSELED);
 366
 367         /* get a handle to the interrupt data pipe */
 368         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 369         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 370
 371         if (maxp < POWERMATE_PAYLOAD_SIZE_MIN || maxp > POWERMATE_PAYLOAD_SIZE_MAX) {
 372                 printk(KERN_WARNING "powermate: Expected payload of %d--%d bytes, found %d bytes!\n",
 373                         POWERMATE_PAYLOAD_SIZE_MIN, POWERMATE_PAYLOAD_SIZE_MAX, maxp);
 374                 maxp = POWERMATE_PAYLOAD_SIZE_MAX;
 375         }
 376
 377         usb_fill_int_urb(pm->irq, udev, pipe, pm->data,
 378                          maxp, powermate_irq,
 379                          pm, endpoint->bInterval);
 380         pm->irq->transfer_dma = pm->data_dma;
 381         pm->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 382
 383         /* register our interrupt URB with the USB system */
 384         if (usb_submit_urb(pm->irq, GFP_KERNEL)) {
 385                 error = -EIO;
 386                 goto fail4;
 387         }
 388
 389         error = input_register_device(pm->input);
 390         if (error)
 391                 goto fail5;
 392
 393
 394         /* force an update of everything */
 395         pm->requires_update = UPDATE_PULSE_ASLEEP | UPDATE_PULSE_AWAKE | UPDATE_PULSE_MODE | UPDATE_STATIC_BRIGHTNESS;
 396         powermate_pulse_led(pm, 0x80, 255, 0, 1, 0); // set default pulse parameters
 397
 398         usb_set_intfdata(intf, pm);
 399         return 0;
 400
 401  fail5: usb_kill_urb(pm->irq);
 402  fail4: usb_free_urb(pm->config);
 403  fail3: usb_free_urb(pm->irq);
 404  fail2: powermate_free_buffers(udev, pm);
 405  fail1: input_free_device(input_dev);
 406         kfree(pm);
 407         return error;
 408 }
 409
 410 /* Called when a USB device we've accepted ownership of is removed */
 411 static void powermate_disconnect(struct usb_interface *intf)
 412 {
 413         struct powermate_device *pm = usb_get_intfdata (intf);
 414
 415         usb_set_intfdata(intf, NULL);
 416         if (pm) {
 417                 pm->requires_update = 0;
 418                 usb_kill_urb(pm->irq);
 419                 input_unregister_device(pm->input);
 420                 usb_free_urb(pm->irq);
 421                 usb_free_urb(pm->config);
 422                 powermate_free_buffers(interface_to_usbdev(intf), pm);
 423
 424                 kfree(pm);
 425         }
 426 }
 427
 428 static struct usb_device_id powermate_devices [] = {
 429         { USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_NEW) },
 430         { USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_OLD) },
 431         { USB_DEVICE(CONTOUR_VENDOR, CONTOUR_JOG) },
 432         { } /* Terminating entry */
 433 };
 434
 435 MODULE_DEVICE_TABLE (usb, powermate_devices);
 436
 437 static struct usb_driver powermate_driver = {
 438         .name =         "powermate",
 439         .probe =        powermate_probe,
 440         .disconnect =   powermate_disconnect,
 441         .id_table =     powermate_devices,
 442 };
 443
 444 static int __init powermate_init(void)
 445 {
 446         return usb_register(&powermate_driver);
 447 }
 448
 449 static void __exit powermate_cleanup(void)
 450 {
 451         usb_deregister(&powermate_driver);
 452 }
 453
 454 module_init(powermate_init);
 455 module_exit(powermate_cleanup);
 456
 457 MODULE_AUTHOR( "William R Sowerbutts" );
 458 MODULE_DESCRIPTION( "Griffin Technology, Inc PowerMate driver" );
 459 MODULE_LICENSE("GPL");