You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
464 lines
15 KiB
464 lines
15 KiB
/*
|
|
* 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/input.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/usb.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;
|
|
int pipe, maxp;
|
|
char path[64];
|
|
|
|
interface = intf->cur_altsetting;
|
|
endpoint = &interface->endpoint[0].desc;
|
|
if (!(endpoint->bEndpointAddress & 0x80))
|
|
return -EIO;
|
|
if ((endpoint->bmAttributes & 3) != 3)
|
|
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);
|
|
|
|
if (!(pm = kmalloc(sizeof(struct powermate_device), GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
|
|
memset(pm, 0, sizeof(struct powermate_device));
|
|
pm->udev = udev;
|
|
|
|
if (powermate_alloc_buffers(udev, pm)) {
|
|
powermate_free_buffers(udev, pm);
|
|
kfree(pm);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pm->irq = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!pm->irq) {
|
|
powermate_free_buffers(udev, pm);
|
|
kfree(pm);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pm->config = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!pm->config) {
|
|
usb_free_urb(pm->irq);
|
|
powermate_free_buffers(udev, pm);
|
|
kfree(pm);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_init(&pm->lock);
|
|
init_input_dev(&pm->input);
|
|
|
|
/* 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("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)) {
|
|
powermate_free_buffers(udev, pm);
|
|
kfree(pm);
|
|
return -EIO; /* failure */
|
|
}
|
|
|
|
switch (le16_to_cpu(udev->descriptor.idProduct)) {
|
|
case POWERMATE_PRODUCT_NEW: pm->input.name = pm_name_powermate; break;
|
|
case POWERMATE_PRODUCT_OLD: pm->input.name = pm_name_soundknob; break;
|
|
default:
|
|
pm->input.name = pm_name_soundknob;
|
|
printk(KERN_WARNING "powermate: unknown product id %04x\n",
|
|
le16_to_cpu(udev->descriptor.idProduct));
|
|
}
|
|
|
|
pm->input.private = pm;
|
|
pm->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_MSC);
|
|
pm->input.keybit[LONG(BTN_0)] = BIT(BTN_0);
|
|
pm->input.relbit[LONG(REL_DIAL)] = BIT(REL_DIAL);
|
|
pm->input.mscbit[LONG(MSC_PULSELED)] = BIT(MSC_PULSELED);
|
|
pm->input.id.bustype = BUS_USB;
|
|
pm->input.id.vendor = le16_to_cpu(udev->descriptor.idVendor);
|
|
pm->input.id.product = le16_to_cpu(udev->descriptor.idProduct);
|
|
pm->input.id.version = le16_to_cpu(udev->descriptor.bcdDevice);
|
|
pm->input.event = powermate_input_event;
|
|
pm->input.dev = &intf->dev;
|
|
pm->input.phys = pm->phys;
|
|
|
|
input_register_device(&pm->input);
|
|
|
|
usb_make_path(udev, path, 64);
|
|
snprintf(pm->phys, 64, "%s/input0", path);
|
|
printk(KERN_INFO "input: %s on %s\n", pm->input.name, pm->input.phys);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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 = {
|
|
.owner = THIS_MODULE,
|
|
.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");
|
|
|