powermate.c

h内核

	}
	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,
		HZ * 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;

	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");