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