| /* |
| * A driver for the Griffin Technology, Inc. "PowerMate" USB controller dial. |
| * |
| * v1.1, (c)2002 William R Sowerbutts <will@sowerbutts.com> |
| * |
| * This device is a anodised aluminium knob which connects over USB. It can measure |
| * clockwise and anticlockwise rotation. The dial also acts as a pushbutton with |
| * a spring for automatic release. The base contains a pair of LEDs which illuminate |
| * the translucent base. It rotates without limit and reports its relative rotation |
| * back to the host when polled by the USB controller. |
| * |
| * Testing with the knob I have has shown that it measures approximately 94 "clicks" |
| * for one full rotation. Testing with my High Speed Rotation Actuator (ok, it was |
| * a variable speed cordless electric drill) has shown that the device can measure |
| * speeds of up to 7 clicks either clockwise or anticlockwise between pollings from |
| * the host. If it counts more than 7 clicks before it is polled, it will wrap back |
| * to zero and start counting again. This was at quite high speed, however, almost |
| * certainly faster than the human hand could turn it. Griffin say that it loses a |
| * pulse or two on a direction change; the granularity is so fine that I never |
| * noticed this in practice. |
| * |
| * The device's microcontroller can be programmed to set the LED to either a constant |
| * intensity, or to a rhythmic pulsing. Several patterns and speeds are available. |
| * |
| * Griffin were very happy to provide documentation and free hardware for development. |
| * |
| * Some userspace tools are available on the web: http://sowerbutts.com/powermate/ |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/usb/input.h> |
| |
| #define POWERMATE_VENDOR 0x077d /* Griffin Technology, Inc. */ |
| #define POWERMATE_PRODUCT_NEW 0x0410 /* Griffin PowerMate */ |
| #define POWERMATE_PRODUCT_OLD 0x04AA /* Griffin soundKnob */ |
| |
| #define CONTOUR_VENDOR 0x05f3 /* Contour Design, Inc. */ |
| #define CONTOUR_JOG 0x0240 /* Jog and Shuttle */ |
| |
| /* these are the command codes we send to the device */ |
| #define SET_STATIC_BRIGHTNESS 0x01 |
| #define SET_PULSE_ASLEEP 0x02 |
| #define SET_PULSE_AWAKE 0x03 |
| #define SET_PULSE_MODE 0x04 |
| |
| /* these refer to bits in the powermate_device's requires_update field. */ |
| #define UPDATE_STATIC_BRIGHTNESS (1<<0) |
| #define UPDATE_PULSE_ASLEEP (1<<1) |
| #define UPDATE_PULSE_AWAKE (1<<2) |
| #define UPDATE_PULSE_MODE (1<<3) |
| |
| /* at least two versions of the hardware exist, with differing payload |
| sizes. the first three bytes always contain the "interesting" data in |
| the relevant format. */ |
| #define POWERMATE_PAYLOAD_SIZE_MAX 6 |
| #define POWERMATE_PAYLOAD_SIZE_MIN 3 |
| struct powermate_device { |
| signed char *data; |
| dma_addr_t data_dma; |
| struct urb *irq, *config; |
| struct usb_ctrlrequest *configcr; |
| dma_addr_t configcr_dma; |
| struct usb_device *udev; |
| struct input_dev *input; |
| spinlock_t lock; |
| int static_brightness; |
| int pulse_speed; |
| int pulse_table; |
| int pulse_asleep; |
| int pulse_awake; |
| int requires_update; // physical settings which are out of sync |
| char phys[64]; |
| }; |
| |
| static char pm_name_powermate[] = "Griffin PowerMate"; |
| static char pm_name_soundknob[] = "Griffin SoundKnob"; |
| |
| static void powermate_config_complete(struct urb *urb, struct pt_regs *regs); |
| |
| /* Callback for data arriving from the PowerMate over the USB interrupt pipe */ |
| static void powermate_irq(struct urb *urb, struct pt_regs *regs) |
| { |
| struct powermate_device *pm = urb->context; |
| int retval; |
| |
| switch (urb->status) { |
| case 0: |
| /* success */ |
| break; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* this urb is terminated, clean up */ |
| dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); |
| return; |
| default: |
| dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); |
| goto exit; |
| } |
| |
| /* handle updates to device state */ |
| input_regs(pm->input, regs); |
| input_report_key(pm->input, BTN_0, pm->data[0] & 0x01); |
| input_report_rel(pm->input, REL_DIAL, pm->data[1]); |
| input_sync(pm->input); |
| |
| exit: |
| retval = usb_submit_urb (urb, GFP_ATOMIC); |
| if (retval) |
| err ("%s - usb_submit_urb failed with result %d", |
| __FUNCTION__, retval); |
| } |
| |
| /* Decide if we need to issue a control message and do so. Must be called with pm->lock taken */ |
| static void powermate_sync_state(struct powermate_device *pm) |
| { |
| if (pm->requires_update == 0) |
| return; /* no updates are required */ |
| if (pm->config->status == -EINPROGRESS) |
| return; /* an update is already in progress; it'll issue this update when it completes */ |
| |
| if (pm->requires_update & UPDATE_PULSE_ASLEEP){ |
| pm->configcr->wValue = cpu_to_le16( SET_PULSE_ASLEEP ); |
| pm->configcr->wIndex = cpu_to_le16( pm->pulse_asleep ? 1 : 0 ); |
| pm->requires_update &= ~UPDATE_PULSE_ASLEEP; |
| }else if (pm->requires_update & UPDATE_PULSE_AWAKE){ |
| pm->configcr->wValue = cpu_to_le16( SET_PULSE_AWAKE ); |
| pm->configcr->wIndex = cpu_to_le16( pm->pulse_awake ? 1 : 0 ); |
| pm->requires_update &= ~UPDATE_PULSE_AWAKE; |
| }else if (pm->requires_update & UPDATE_PULSE_MODE){ |
| int op, arg; |
| /* the powermate takes an operation and an argument for its pulse algorithm. |
| the operation can be: |
| 0: divide the speed |
| 1: pulse at normal speed |
| 2: multiply the speed |
| the argument only has an effect for operations 0 and 2, and ranges between |
| 1 (least effect) to 255 (maximum effect). |
| |
| thus, several states are equivalent and are coalesced into one state. |
| |
| we map this onto a range from 0 to 510, with: |
| 0 -- 254 -- use divide (0 = slowest) |
| 255 -- use normal speed |
| 256 -- 510 -- use multiple (510 = fastest). |
| |
| Only values of 'arg' quite close to 255 are particularly useful/spectacular. |
| */ |
| if (pm->pulse_speed < 255) { |
| op = 0; // divide |
| arg = 255 - pm->pulse_speed; |
| } else if (pm->pulse_speed > 255) { |
| op = 2; // multiply |
| arg = pm->pulse_speed - 255; |
| } else { |
| op = 1; // normal speed |
| arg = 0; // can be any value |
| } |
| pm->configcr->wValue = cpu_to_le16( (pm->pulse_table << 8) | SET_PULSE_MODE ); |
| pm->configcr->wIndex = cpu_to_le16( (arg << 8) | op ); |
| pm->requires_update &= ~UPDATE_PULSE_MODE; |
| } else if (pm->requires_update & UPDATE_STATIC_BRIGHTNESS) { |
| pm->configcr->wValue = cpu_to_le16( SET_STATIC_BRIGHTNESS ); |
| pm->configcr->wIndex = cpu_to_le16( pm->static_brightness ); |
| pm->requires_update &= ~UPDATE_STATIC_BRIGHTNESS; |
| } else { |
| printk(KERN_ERR "powermate: unknown update required"); |
| pm->requires_update = 0; /* fudge the bug */ |
| return; |
| } |
| |
| /* printk("powermate: %04x %04x\n", pm->configcr->wValue, pm->configcr->wIndex); */ |
| |
| pm->configcr->bRequestType = 0x41; /* vendor request */ |
| pm->configcr->bRequest = 0x01; |
| pm->configcr->wLength = 0; |
| |
| usb_fill_control_urb(pm->config, pm->udev, usb_sndctrlpipe(pm->udev, 0), |
| (void *) pm->configcr, NULL, 0, |
| powermate_config_complete, pm); |
| pm->config->setup_dma = pm->configcr_dma; |
| pm->config->transfer_flags |= URB_NO_SETUP_DMA_MAP; |
| |
| if (usb_submit_urb(pm->config, GFP_ATOMIC)) |
| printk(KERN_ERR "powermate: usb_submit_urb(config) failed"); |
| } |
| |
| /* Called when our asynchronous control message completes. We may need to issue another immediately */ |
| static void powermate_config_complete(struct urb *urb, struct pt_regs *regs) |
| { |
| struct powermate_device *pm = urb->context; |
| unsigned long flags; |
| |
| if (urb->status) |
| printk(KERN_ERR "powermate: config urb returned %d\n", urb->status); |
| |
| spin_lock_irqsave(&pm->lock, flags); |
| powermate_sync_state(pm); |
| spin_unlock_irqrestore(&pm->lock, flags); |
| } |
| |
| /* Set the LED up as described and begin the sync with the hardware if required */ |
| static void powermate_pulse_led(struct powermate_device *pm, int static_brightness, int pulse_speed, |
| int pulse_table, int pulse_asleep, int pulse_awake) |
| { |
| unsigned long flags; |
| |
| if (pulse_speed < 0) |
| pulse_speed = 0; |
| if (pulse_table < 0) |
| pulse_table = 0; |
| if (pulse_speed > 510) |
| pulse_speed = 510; |
| if (pulse_table > 2) |
| pulse_table = 2; |
| |
| pulse_asleep = !!pulse_asleep; |
| pulse_awake = !!pulse_awake; |
| |
| |
| spin_lock_irqsave(&pm->lock, flags); |
| |
| /* mark state updates which are required */ |
| if (static_brightness != pm->static_brightness) { |
| pm->static_brightness = static_brightness; |
| pm->requires_update |= UPDATE_STATIC_BRIGHTNESS; |
| } |
| if (pulse_asleep != pm->pulse_asleep) { |
| pm->pulse_asleep = pulse_asleep; |
| pm->requires_update |= (UPDATE_PULSE_ASLEEP | UPDATE_STATIC_BRIGHTNESS); |
| } |
| if (pulse_awake != pm->pulse_awake) { |
| pm->pulse_awake = pulse_awake; |
| pm->requires_update |= (UPDATE_PULSE_AWAKE | UPDATE_STATIC_BRIGHTNESS); |
| } |
| if (pulse_speed != pm->pulse_speed || pulse_table != pm->pulse_table) { |
| pm->pulse_speed = pulse_speed; |
| pm->pulse_table = pulse_table; |
| pm->requires_update |= UPDATE_PULSE_MODE; |
| } |
| |
| powermate_sync_state(pm); |
| |
| spin_unlock_irqrestore(&pm->lock, flags); |
| } |
| |
| /* Callback from the Input layer when an event arrives from userspace to configure the LED */ |
| static int powermate_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int _value) |
| { |
| unsigned int command = (unsigned int)_value; |
| struct powermate_device *pm = dev->private; |
| |
| if (type == EV_MSC && code == MSC_PULSELED){ |
| /* |
| bits 0- 7: 8 bits: LED brightness |
| bits 8-16: 9 bits: pulsing speed modifier (0 ... 510); 0-254 = slower, 255 = standard, 256-510 = faster. |
| bits 17-18: 2 bits: pulse table (0, 1, 2 valid) |
| bit 19: 1 bit : pulse whilst asleep? |
| bit 20: 1 bit : pulse constantly? |
| */ |
| int static_brightness = command & 0xFF; // bits 0-7 |
| int pulse_speed = (command >> 8) & 0x1FF; // bits 8-16 |
| int pulse_table = (command >> 17) & 0x3; // bits 17-18 |
| int pulse_asleep = (command >> 19) & 0x1; // bit 19 |
| int pulse_awake = (command >> 20) & 0x1; // bit 20 |
| |
| powermate_pulse_led(pm, static_brightness, pulse_speed, pulse_table, pulse_asleep, pulse_awake); |
| } |
| |
| return 0; |
| } |
| |
| static int powermate_alloc_buffers(struct usb_device *udev, struct powermate_device *pm) |
| { |
| pm->data = usb_buffer_alloc(udev, POWERMATE_PAYLOAD_SIZE_MAX, |
| SLAB_ATOMIC, &pm->data_dma); |
| if (!pm->data) |
| return -1; |
| |
| pm->configcr = usb_buffer_alloc(udev, sizeof(*(pm->configcr)), |
| SLAB_ATOMIC, &pm->configcr_dma); |
| if (!pm->configcr) |
| return -1; |
| |
| return 0; |
| } |
| |
| static void powermate_free_buffers(struct usb_device *udev, struct powermate_device *pm) |
| { |
| if (pm->data) |
| usb_buffer_free(udev, POWERMATE_PAYLOAD_SIZE_MAX, |
| pm->data, pm->data_dma); |
| if (pm->configcr) |
| usb_buffer_free(udev, sizeof(*(pm->configcr)), |
| pm->configcr, pm->configcr_dma); |
| } |
| |
| /* Called whenever a USB device matching one in our supported devices table is connected */ |
| static int powermate_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| { |
| struct usb_device *udev = interface_to_usbdev (intf); |
| struct usb_host_interface *interface; |
| struct usb_endpoint_descriptor *endpoint; |
| struct powermate_device *pm; |
| struct input_dev *input_dev; |
| int pipe, maxp; |
| int err = -ENOMEM; |
| |
| interface = intf->cur_altsetting; |
| endpoint = &interface->endpoint[0].desc; |
| if (!usb_endpoint_is_int_in(endpoint)) |
| return -EIO; |
| |
| usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| 0x0a, USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| 0, interface->desc.bInterfaceNumber, NULL, 0, |
| USB_CTRL_SET_TIMEOUT); |
| |
| pm = kzalloc(sizeof(struct powermate_device), GFP_KERNEL); |
| input_dev = input_allocate_device(); |
| if (!pm || !input_dev) |
| goto fail1; |
| |
| if (powermate_alloc_buffers(udev, pm)) |
| goto fail2; |
| |
| pm->irq = usb_alloc_urb(0, GFP_KERNEL); |
| if (!pm->irq) |
| goto fail2; |
| |
| pm->config = usb_alloc_urb(0, GFP_KERNEL); |
| if (!pm->config) |
| goto fail3; |
| |
| pm->udev = udev; |
| pm->input = input_dev; |
| |
| usb_make_path(udev, pm->phys, sizeof(pm->phys)); |
| strlcpy(pm->phys, "/input0", sizeof(pm->phys)); |
| |
| spin_lock_init(&pm->lock); |
| |
| switch (le16_to_cpu(udev->descriptor.idProduct)) { |
| case POWERMATE_PRODUCT_NEW: |
| input_dev->name = pm_name_powermate; |
| break; |
| case POWERMATE_PRODUCT_OLD: |
| input_dev->name = pm_name_soundknob; |
| break; |
| default: |
| input_dev->name = pm_name_soundknob; |
| printk(KERN_WARNING "powermate: unknown product id %04x\n", |
| le16_to_cpu(udev->descriptor.idProduct)); |
| } |
| |
| input_dev->phys = pm->phys; |
| usb_to_input_id(udev, &input_dev->id); |
| input_dev->cdev.dev = &intf->dev; |
| input_dev->private = pm; |
| |
| input_dev->event = powermate_input_event; |
| |
| input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_MSC); |
| input_dev->keybit[LONG(BTN_0)] = BIT(BTN_0); |
| input_dev->relbit[LONG(REL_DIAL)] = BIT(REL_DIAL); |
| input_dev->mscbit[LONG(MSC_PULSELED)] = BIT(MSC_PULSELED); |
| |
| /* get a handle to the interrupt data pipe */ |
| pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); |
| maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); |
| |
| if (maxp < POWERMATE_PAYLOAD_SIZE_MIN || maxp > POWERMATE_PAYLOAD_SIZE_MAX) { |
| printk(KERN_WARNING "powermate: Expected payload of %d--%d bytes, found %d bytes!\n", |
| POWERMATE_PAYLOAD_SIZE_MIN, POWERMATE_PAYLOAD_SIZE_MAX, maxp); |
| maxp = POWERMATE_PAYLOAD_SIZE_MAX; |
| } |
| |
| usb_fill_int_urb(pm->irq, udev, pipe, pm->data, |
| maxp, powermate_irq, |
| pm, endpoint->bInterval); |
| pm->irq->transfer_dma = pm->data_dma; |
| pm->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| |
| /* register our interrupt URB with the USB system */ |
| if (usb_submit_urb(pm->irq, GFP_KERNEL)) { |
| err = -EIO; |
| goto fail4; |
| } |
| |
| input_register_device(pm->input); |
| |
| /* force an update of everything */ |
| pm->requires_update = UPDATE_PULSE_ASLEEP | UPDATE_PULSE_AWAKE | UPDATE_PULSE_MODE | UPDATE_STATIC_BRIGHTNESS; |
| powermate_pulse_led(pm, 0x80, 255, 0, 1, 0); // set default pulse parameters |
| |
| usb_set_intfdata(intf, pm); |
| return 0; |
| |
| fail4: usb_free_urb(pm->config); |
| fail3: usb_free_urb(pm->irq); |
| fail2: powermate_free_buffers(udev, pm); |
| fail1: input_free_device(input_dev); |
| kfree(pm); |
| return err; |
| } |
| |
| /* Called when a USB device we've accepted ownership of is removed */ |
| static void powermate_disconnect(struct usb_interface *intf) |
| { |
| struct powermate_device *pm = usb_get_intfdata (intf); |
| |
| usb_set_intfdata(intf, NULL); |
| if (pm) { |
| pm->requires_update = 0; |
| usb_kill_urb(pm->irq); |
| input_unregister_device(pm->input); |
| usb_free_urb(pm->irq); |
| usb_free_urb(pm->config); |
| powermate_free_buffers(interface_to_usbdev(intf), pm); |
| |
| kfree(pm); |
| } |
| } |
| |
| static struct usb_device_id powermate_devices [] = { |
| { USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_NEW) }, |
| { USB_DEVICE(POWERMATE_VENDOR, POWERMATE_PRODUCT_OLD) }, |
| { USB_DEVICE(CONTOUR_VENDOR, CONTOUR_JOG) }, |
| { } /* Terminating entry */ |
| }; |
| |
| MODULE_DEVICE_TABLE (usb, powermate_devices); |
| |
| static struct usb_driver powermate_driver = { |
| .name = "powermate", |
| .probe = powermate_probe, |
| .disconnect = powermate_disconnect, |
| .id_table = powermate_devices, |
| }; |
| |
| static int __init powermate_init(void) |
| { |
| return usb_register(&powermate_driver); |
| } |
| |
| static void __exit powermate_cleanup(void) |
| { |
| usb_deregister(&powermate_driver); |
| } |
| |
| module_init(powermate_init); |
| module_exit(powermate_cleanup); |
| |
| MODULE_AUTHOR( "William R Sowerbutts" ); |
| MODULE_DESCRIPTION( "Griffin Technology, Inc PowerMate driver" ); |
| MODULE_LICENSE("GPL"); |