drivers/usb/input/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         dma_addr_t configcr_dma;
  68         struct usb_device *udev;
  69         struct input_dev *input;
  70         spinlock_t lock;
  71         int static_brightness;
  72         int pulse_speed;
  73         int pulse_table;
  74         int pulse_asleep;
  75         int pulse_awake;
  76         int requires_update; // physical settings which are out of sync
  77         char phys[64];
  78 };
  79
  80 static char pm_name_powermate[] = "Griffin PowerMate";
  81 static char pm_name_soundknob[] = "Griffin SoundKnob";
  82
  83 static void powermate_config_complete(struct urb *urb);
  84
  85 /* Callback for data arriving from the PowerMate over the USB interrupt pipe */
  86 static void powermate_irq(struct urb *urb)
  87 {
  88         struct powermate_device *pm = urb->context;
  89         int retval;
  90
  91         switch (urb->status) {
  92         case 0:
  93                 /* success */
  94                 break;
  95         case -ECONNRESET:
  96         case -ENOENT:
  97         case -ESHUTDOWN:
  98                 /* this urb is terminated, clean up */
  99                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 100                 return;
 101         default:
 102                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 103                 goto exit;
 104         }
 105
 106         /* handle updates to device state */
 107         input_report_key(pm->input, BTN_0, pm->data[0] & 0x01);
 108         input_report_rel(pm->input, REL_DIAL, pm->data[1]);
 109         input_sync(pm->input);
 110
 111 exit:
 112         retval = usb_submit_urb (urb, GFP_ATOMIC);
 113         if (retval)
 114                 err ("%s - usb_submit_urb failed with result %d",
 115                      __FUNCTION__, retval);
 116 }
 117
 118 /* Decide if we need to issue a control message and do so. Must be called with pm->lock taken */
 119 static void powermate_sync_state(struct powermate_device *pm)
 120 {
 121         if (pm->requires_update == 0)
 122                 return; /* no updates are required */
 123         if (pm->config->status == -EINPROGRESS)
 124                 return; /* an update is already in progress; it'll issue this update when it completes */
 125
 126         if (pm->requires_update & UPDATE_PULSE_ASLEEP){
 127                 pm->configcr->wValue = cpu_to_le16( SET_PULSE_ASLEEP );
 128                 pm->configcr->wIndex = cpu_to_le16( pm->pulse_asleep ? 1 : 0 );
 129                 pm->requires_update &= ~UPDATE_PULSE_ASLEEP;
 130         }else if (pm->requires_update & UPDATE_PULSE_AWAKE){
 131                 pm->configcr->wValue = cpu_to_le16( SET_PULSE_AWAKE );
 132                 pm->configcr->wIndex = cpu_to_le16( pm->pulse_awake ? 1 : 0 );
 133                 pm->requires_update &= ~UPDATE_PULSE_AWAKE;
 134         }else if (pm->requires_update & UPDATE_PULSE_MODE){
 135                 int op, arg;
 136                 /* the powermate takes an operation and an argument for its pulse algorithm.
 137                    the operation can be:
 138                    0: divide the speed
 139                    1: pulse at normal speed
 140                    2: multiply the speed
 141                    the argument only has an effect for operations 0 and 2, and ranges between
 142                    1 (least effect) to 255 (maximum effect).
 143
 144                    thus, several states are equivalent and are coalesced into one state.
 145
 146                    we map this onto a range from 0 to 510, with:
 147                    0 -- 254    -- use divide (0 = slowest)
 148                    255         -- use normal speed
 149                    256 -- 510  -- use multiple (510 = fastest).
 150
 151                    Only values of 'arg' quite close to 255 are particularly useful/spectacular.
 152                 */
 153                 if (pm->pulse_speed < 255) {
 154                         op = 0;                   // divide
 155                         arg = 255 - pm->pulse_speed;
 156                 } else if (pm->pulse_speed > 255) {
 157                         op = 2;                   // multiply
 158                         arg = pm->pulse_speed - 255;
 159                 } else {
 160                         op = 1;                   // normal speed
 161                         arg = 0;                  // can be any value
 162                 }
 163                 pm->configcr->wValue = cpu_to_le16( (pm->pulse_table << 8) | SET_PULSE_MODE );
 164                 pm->configcr->wIndex = cpu_to_le16( (arg << 8) | op );
 165                 pm->requires_update &= ~UPDATE_PULSE_MODE;
 166         } else if (pm->requires_update & UPDATE_STATIC_BRIGHTNESS) {
 167                 pm->configcr->wValue = cpu_to_le16( SET_STATIC_BRIGHTNESS );
 168                 pm->configcr->wIndex = cpu_to_le16( pm->static_brightness );
 169                 pm->requires_update &= ~UPDATE_STATIC_BRIGHTNESS;
 170         } else {
 171                 printk(KERN_ERR "powermate: unknown update required");
 172                 pm->requires_update = 0; /* fudge the bug */
 173                 return;
 174         }
 175
 176 /*      printk("powermate: %04x %04x\n", pm->configcr->wValue, pm->configcr->wIndex); */
 177
 178         pm->configcr->bRequestType = 0x41; /* vendor request */
 179         pm->configcr->bRequest = 0x01;
 180         pm->configcr->wLength = 0;
 181
 182         usb_fill_control_urb(pm->config, pm->udev, usb_sndctrlpipe(pm->udev, 0),
 183                              (void *) pm->configcr, NULL, 0,
 184                              powermate_config_complete, pm);
 185         pm->config->setup_dma = pm->configcr_dma;
 186         pm->config->transfer_flags |= URB_NO_SETUP_DMA_MAP;
 187
 188         if (usb_submit_urb(pm->config, GFP_ATOMIC))
 189                 printk(KERN_ERR "powermate: usb_submit_urb(config) failed");
 190 }
 191
 192 /* Called when our asynchronous control message completes. We may need to issue another immediately */
 193 static void powermate_config_complete(struct urb *urb)
 194 {
 195         struct powermate_device *pm = urb->context;
 196         unsigned long flags;
 197
 198         if (urb->status)
 199                 printk(KERN_ERR "powermate: config urb returned %d\n", urb->status);
 200
 201         spin_lock_irqsave(&pm->lock, flags);
 202         powermate_sync_state(pm);
 203         spin_unlock_irqrestore(&pm->lock, flags);
 204 }
 205
 206 /* Set the LED up as described and begin the sync with the hardware if required */
 207 static void powermate_pulse_led(struct powermate_device *pm, int static_brightness, int pulse_speed,
 208                                 int pulse_table, int pulse_asleep, int pulse_awake)
 209 {
 210         unsigned long flags;
 211
 212         if (pulse_speed < 0)
 213                 pulse_speed = 0;
 214         if (pulse_table < 0)
 215                 pulse_table = 0;
 216         if (pulse_speed > 510)
 217                 pulse_speed = 510;
 218         if (pulse_table > 2)
 219                 pulse_table = 2;
 220
 221         pulse_asleep = !!pulse_asleep;
 222         pulse_awake = !!pulse_awake;
 223
 224
 225         spin_lock_irqsave(&pm->lock, flags);
 226
 227         /* mark state updates which are required */
 228         if (static_brightness != pm->static_brightness) {
 229                 pm->static_brightness = static_brightness;
 230                 pm->requires_update |= UPDATE_STATIC_BRIGHTNESS;
 231         }
 232         if (pulse_asleep != pm->pulse_asleep) {
 233                 pm->pulse_asleep = pulse_asleep;
 234                 pm->requires_update |= (UPDATE_PULSE_ASLEEP | UPDATE_STATIC_BRIGHTNESS);
 235         }
 236         if (pulse_awake != pm->pulse_awake) {
 237                 pm->pulse_awake = pulse_awake;
 238                 pm->requires_update |= (UPDATE_PULSE_AWAKE | UPDATE_STATIC_BRIGHTNESS);
 239         }
 240         if (pulse_speed != pm->pulse_speed || pulse_table != pm->pulse_table) {
 241                 pm->pulse_speed = pulse_speed;
 242                 pm->pulse_table = pulse_table;
 243                 pm->requires_update |= UPDATE_PULSE_MODE;
 244         }
 245
 246         powermate_sync_state(pm);
 247
 248         spin_unlock_irqrestore(&pm->lock, flags);
 249 }
 250
 251 /* Callback from the Input layer when an event arrives from userspace to configure the LED */
 252 static int powermate_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int _value)
 253 {
 254         unsigned int command = (unsigned int)_value;
 255         struct powermate_device *pm = dev->private;
 256
 257         if (type == EV_MSC && code == MSC_PULSELED){
 258                 /*
 259                     bits  0- 7: 8 bits: LED brightness
 260                     bits  8-16: 9 bits: pulsing speed modifier (0 ... 510); 0-254 = slower, 255 = standard, 256-510 = faster.
 261                     bits 17-18: 2 bits: pulse table (0, 1, 2 valid)
 262                     bit     19: 1 bit : pulse whilst asleep?
 263                     bit     20: 1 bit : pulse constantly?
 264                 */
 265                 int static_brightness = command & 0xFF;   // bits 0-7
 266                 int pulse_speed = (command >> 8) & 0x1FF; // bits 8-16
 267                 int pulse_table = (command >> 17) & 0x3;  // bits 17-18
 268                 int pulse_asleep = (command >> 19) & 0x1; // bit 19
 269                 int pulse_awake  = (command >> 20) & 0x1; // bit 20
 270
 271                 powermate_pulse_led(pm, static_brightness, pulse_speed, pulse_table, pulse_asleep, pulse_awake);
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int powermate_alloc_buffers(struct usb_device *udev, struct powermate_device *pm)
 278 {
 279         pm->data = usb_buffer_alloc(udev, POWERMATE_PAYLOAD_SIZE_MAX,
 280                                     SLAB_ATOMIC, &pm->data_dma);
 281         if (!pm->data)
 282                 return -1;
 283
 284         pm->configcr = usb_buffer_alloc(udev, sizeof(*(pm->configcr)),
 285                                         SLAB_ATOMIC, &pm->configcr_dma);
 286         if (!pm->configcr)
 287                 return -1;
 288
 289         return 0;
 290 }
 291
 292 static void powermate_free_buffers(struct usb_device *udev, struct powermate_device *pm)
 293 {
 294         if (pm->data)
 295                 usb_buffer_free(udev, POWERMATE_PAYLOAD_SIZE_MAX,
 296                                 pm->data, pm->data_dma);
 297         if (pm->configcr)
 298                 usb_buffer_free(udev, sizeof(*(pm->configcr)),
 299                                 pm->configcr, pm->configcr_dma);
 300 }
 301
 302 /* Called whenever a USB device matching one in our supported devices table is connected */
 303 static int powermate_probe(struct usb_interface *intf, const struct usb_device_id *id)
 304 {
 305         struct usb_device *udev = interface_to_usbdev (intf);
 306         struct usb_host_interface *interface;
 307         struct usb_endpoint_descriptor *endpoint;
 308         struct powermate_device *pm;
 309         struct input_dev *input_dev;
 310         int pipe, maxp;
 311         int err = -ENOMEM;
 312
 313         interface = intf->cur_altsetting;
 314         endpoint = &interface->endpoint[0].desc;
 315         if (!usb_endpoint_is_int_in(endpoint))
 316                 return -EIO;
 317
 318         usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 319                 0x0a, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 320                 0, interface->desc.bInterfaceNumber, NULL, 0,
 321                 USB_CTRL_SET_TIMEOUT);
 322
 323         pm = kzalloc(sizeof(struct powermate_device), GFP_KERNEL);
 324         input_dev = input_allocate_device();
 325         if (!pm || !input_dev)
 326                 goto fail1;
 327
 328         if (powermate_alloc_buffers(udev, pm))
 329                 goto fail2;
 330
 331         pm->irq = usb_alloc_urb(0, GFP_KERNEL);
 332         if (!pm->irq)
 333                 goto fail2;
 334
 335         pm->config = usb_alloc_urb(0, GFP_KERNEL);
 336         if (!pm->config)
 337                 goto fail3;
 338
 339         pm->udev = udev;
 340         pm->input = input_dev;
 341
 342         usb_make_path(udev, pm->phys, sizeof(pm->phys));
 343         strlcpy(pm->phys, "/input0", sizeof(pm->phys));
 344
 345         spin_lock_init(&pm->lock);
 346
 347         switch (le16_to_cpu(udev->descriptor.idProduct)) {
 348         case POWERMATE_PRODUCT_NEW:
 349                 input_dev->name = pm_name_powermate;
 350                 break;
 351         case POWERMATE_PRODUCT_OLD:
 352                 input_dev->name = pm_name_soundknob;
 353                 break;
 354         default:
 355                 input_dev->name = pm_name_soundknob;
 356                 printk(KERN_WARNING "powermate: unknown product id %04x\n",
 357                        le16_to_cpu(udev->descriptor.idProduct));
 358         }
 359
 360         input_dev->phys = pm->phys;
 361         usb_to_input_id(udev, &input_dev->id);
 362         input_dev->cdev.dev = &intf->dev;
 363         input_dev->private = pm;
 364
 365         input_dev->event = powermate_input_event;
 366
 367         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_MSC);
 368         input_dev->keybit[LONG(BTN_0)] = BIT(BTN_0);
 369         input_dev->relbit[LONG(REL_DIAL)] = BIT(REL_DIAL);
 370         input_dev->mscbit[LONG(MSC_PULSELED)] = BIT(MSC_PULSELED);
 371
 372         /* get a handle to the interrupt data pipe */
 373         pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 374         maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
 375
 376         if (maxp < POWERMATE_PAYLOAD_SIZE_MIN || maxp > POWERMATE_PAYLOAD_SIZE_MAX) {
 377                 printk(KERN_WARNING "powermate: Expected payload of %d--%d bytes, found %d bytes!\n",
 378                         POWERMATE_PAYLOAD_SIZE_MIN, POWERMATE_PAYLOAD_SIZE_MAX, maxp);
 379                 maxp = POWERMATE_PAYLOAD_SIZE_MAX;
 380         }
 381
 382         usb_fill_int_urb(pm->irq, udev, pipe, pm->data,
 383                          maxp, powermate_irq,
 384                          pm, endpoint->bInterval);
 385         pm->irq->transfer_dma = pm->data_dma;
 386         pm->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 387
 388         /* register our interrupt URB with the USB system */
 389         if (usb_submit_urb(pm->irq, GFP_KERNEL)) {
 390                 err = -EIO;
 391                 goto fail4;
 392         }
 393
 394         input_register_device(pm->input);
 395
 396         /* force an update of everything */
 397         pm->requires_update = UPDATE_PULSE_ASLEEP | UPDATE_PULSE_AWAKE | UPDATE_PULSE_MODE | UPDATE_STATIC_BRIGHTNESS;
 398         powermate_pulse_led(pm, 0x80, 255, 0, 1, 0); // set default pulse parameters
 399
 400         usb_set_intfdata(intf, pm);
 401         return 0;
 402
 403 fail4:  usb_free_urb(pm->config);
 404 fail3:  usb_free_urb(pm->irq);
 405 fail2:  powermate_free_buffers(udev, pm);
 406 fail1:  input_free_device(input_dev);
 407         kfree(pm);
 408         return err;
 409 }
 410
 411 /* Called when a USB device we've accepted ownership of is removed */
 412 static void powermate_disconnect(struct usb_interface *intf)
 413 {
 414         struct powermate_device *pm = usb_get_intfdata (intf);
 415
 416         usb_set_intfdata(intf, NULL);
 417         if (pm) {
 418                 pm->requires_update = 0;
 419                 usb_kill_urb(pm->irq);
 420                 input_unregister_device(pm->input);
 421                 usb_free_urb(pm->irq);
 422                 usb_free_urb(pm->config);
 423                 powermate_free_buffers(interface_to_usbdev(intf), pm);
 424
 425                 kfree(pm);
 426         }
 427 }
 428
 429 static struct usb_device_id powermate_devices [] = {
 430         { USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_NEW) },
 431         { USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_OLD) },
 432         { USB_DEVICE(CONTOUR_VENDOR, CONTOUR_JOG) },
 433         { } /* Terminating entry */
 434 };
 435
 436 MODULE_DEVICE_TABLE (usb, powermate_devices);
 437
 438 static struct usb_driver powermate_driver = {
 439         .name =         "powermate",
 440         .probe =        powermate_probe,
 441         .disconnect =   powermate_disconnect,
 442         .id_table =     powermate_devices,
 443 };
 444
 445 static int __init powermate_init(void)
 446 {
 447         return usb_register(&powermate_driver);
 448 }
 449
 450 static void __exit powermate_cleanup(void)
 451 {
 452         usb_deregister(&powermate_driver);
 453 }
 454
 455 module_init(powermate_init);
 456 module_exit(powermate_cleanup);
 457
 458 MODULE_AUTHOR( "William R Sowerbutts" );
 459 MODULE_DESCRIPTION( "Griffin Technology, Inc PowerMate driver" );
 460 MODULE_LICENSE("GPL");