aiptek.c

linux 内核源代码

	struct aiptek *aiptek = dev_get_drvdata(dev);

	aiptek->newSetting.wheel = (int)simple_strtol(buf, NULL, 10);
	return count;
}

static DEVICE_ATTR(wheel,
		   S_IRUGO | S_IWUGO, show_tabletWheel, store_tabletWheel);

/***********************************************************************
 * support routines for the 'execute' file. Note that this file
 * both displays current setting and allows for setting changing.
 */
static ssize_t show_tabletExecute(struct device *dev, struct device_attribute *attr, char *buf)
{
	/* There is nothing useful to display, so a one-line manual
	 * is in order...
	 */
	return snprintf(buf, PAGE_SIZE,
			"Write anything to this file to program your tablet.\n");
}

static ssize_t
store_tabletExecute(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	/* We do not care what you write to this file. Merely the action
	 * of writing to this file triggers a tablet reprogramming.
	 */
	memcpy(&aiptek->curSetting, &aiptek->newSetting,
	       sizeof(struct aiptek_settings));

	if (aiptek_program_tablet(aiptek) < 0)
		return -EIO;

	return count;
}

static DEVICE_ATTR(execute,
		   S_IRUGO | S_IWUGO, show_tabletExecute, store_tabletExecute);

/***********************************************************************
 * support routines for the 'odm_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletODMCode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "0x%04x\n", aiptek->features.odmCode);
}

static DEVICE_ATTR(odm_code, S_IRUGO, show_tabletODMCode, NULL);

/***********************************************************************
 * support routines for the 'model_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_tabletModelCode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "0x%04x\n", aiptek->features.modelCode);
}

static DEVICE_ATTR(model_code, S_IRUGO, show_tabletModelCode, NULL);

/***********************************************************************
 * support routines for the 'firmware_code' file. Note that this file
 * only displays current setting.
 */
static ssize_t show_firmwareCode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct aiptek *aiptek = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%04x\n",
			aiptek->features.firmwareCode);
}

static DEVICE_ATTR(firmware_code, S_IRUGO, show_firmwareCode, NULL);

static struct attribute *aiptek_attributes[] = {
	&dev_attr_size.attr,
	&dev_attr_pointer_mode.attr,
	&dev_attr_coordinate_mode.attr,
	&dev_attr_tool_mode.attr,
	&dev_attr_xtilt.attr,
	&dev_attr_ytilt.attr,
	&dev_attr_jitter.attr,
	&dev_attr_delay.attr,
	&dev_attr_event_count.attr,
	&dev_attr_diagnostic.attr,
	&dev_attr_odm_code.attr,
	&dev_attr_model_code.attr,
	&dev_attr_firmware_code.attr,
	&dev_attr_stylus_lower.attr,
	&dev_attr_stylus_upper.attr,
	&dev_attr_mouse_left.attr,
	&dev_attr_mouse_middle.attr,
	&dev_attr_mouse_right.attr,
	&dev_attr_wheel.attr,
	&dev_attr_execute.attr,
	NULL
};

static struct attribute_group aiptek_attribute_group = {
	.attrs	= aiptek_attributes,
};

/***********************************************************************
 * This routine is called when a tablet has been identified. It basically
 * sets up the tablet and the driver's internal structures.
 */
static int
aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *usbdev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *endpoint;
	struct aiptek *aiptek;
	struct input_dev *inputdev;
	int i;
	int speeds[] = { 0,
		AIPTEK_PROGRAMMABLE_DELAY_50,
		AIPTEK_PROGRAMMABLE_DELAY_400,
		AIPTEK_PROGRAMMABLE_DELAY_25,
		AIPTEK_PROGRAMMABLE_DELAY_100,
		AIPTEK_PROGRAMMABLE_DELAY_200,
		AIPTEK_PROGRAMMABLE_DELAY_300
	};
	int err = -ENOMEM;

	/* programmableDelay is where the command-line specified
	 * delay is kept. We make it the first element of speeds[],
	 * so therefore, your override speed is tried first, then the
	 * remainder. Note that the default value of 400ms will be tried
	 * if you do not specify any command line parameter.
	 */
	speeds[0] = programmableDelay;

	aiptek = kzalloc(sizeof(struct aiptek), GFP_KERNEL);
	inputdev = input_allocate_device();
	if (!aiptek || !inputdev) {
		warn("aiptek: cannot allocate memory or input device");
		goto fail1;
        }

	aiptek->data = usb_buffer_alloc(usbdev, AIPTEK_PACKET_LENGTH,
					GFP_ATOMIC, &aiptek->data_dma);
        if (!aiptek->data) {
		warn("aiptek: cannot allocate usb buffer");
		goto fail1;
	}

	aiptek->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!aiptek->urb) {
	        warn("aiptek: cannot allocate urb");
		goto fail2;
	}

	aiptek->inputdev = inputdev;
	aiptek->usbdev = usbdev;
	aiptek->ifnum = intf->altsetting[0].desc.bInterfaceNumber;
	aiptek->inDelay = 0;
	aiptek->endDelay = 0;
	aiptek->previousJitterable = 0;
	aiptek->lastMacro = -1;

	/* Set up the curSettings struct. Said struct contains the current
	 * programmable parameters. The newSetting struct contains changes
	 * the user makes to the settings via the sysfs interface. Those
	 * changes are not "committed" to curSettings until the user
	 * writes to the sysfs/.../execute file.
	 */
	aiptek->curSetting.pointerMode = AIPTEK_POINTER_EITHER_MODE;
	aiptek->curSetting.coordinateMode = AIPTEK_COORDINATE_ABSOLUTE_MODE;
	aiptek->curSetting.toolMode = AIPTEK_TOOL_BUTTON_PEN_MODE;
	aiptek->curSetting.xTilt = AIPTEK_TILT_DISABLE;
	aiptek->curSetting.yTilt = AIPTEK_TILT_DISABLE;
	aiptek->curSetting.mouseButtonLeft = AIPTEK_MOUSE_LEFT_BUTTON;
	aiptek->curSetting.mouseButtonMiddle = AIPTEK_MOUSE_MIDDLE_BUTTON;
	aiptek->curSetting.mouseButtonRight = AIPTEK_MOUSE_RIGHT_BUTTON;
	aiptek->curSetting.stylusButtonUpper = AIPTEK_STYLUS_UPPER_BUTTON;
	aiptek->curSetting.stylusButtonLower = AIPTEK_STYLUS_LOWER_BUTTON;
	aiptek->curSetting.jitterDelay = jitterDelay;
	aiptek->curSetting.programmableDelay = programmableDelay;

	/* Both structs should have equivalent settings
	 */
	aiptek->newSetting = aiptek->curSetting;

	/* Determine the usb devices' physical path.
	 * Asketh not why we always pretend we're using "../input0",
	 * but I suspect this will have to be refactored one
	 * day if a single USB device can be a keyboard & a mouse
	 * & a tablet, and the inputX number actually will tell
	 * us something...
	 */
	usb_make_path(usbdev, aiptek->features.usbPath,
			sizeof(aiptek->features.usbPath));
	strlcat(aiptek->features.usbPath, "/input0",
		sizeof(aiptek->features.usbPath));

	/* Set up client data, pointers to open and close routines
	 * for the input device.
	 */
	inputdev->name = "Aiptek";
	inputdev->phys = aiptek->features.usbPath;
	usb_to_input_id(usbdev, &inputdev->id);
	inputdev->dev.parent = &intf->dev;

	input_set_drvdata(inputdev, aiptek);

	inputdev->open = aiptek_open;
	inputdev->close = aiptek_close;

	/* Now program the capacities of the tablet, in terms of being
	 * an input device.
	 */
	for (i = 0; i < ARRAY_SIZE(eventTypes); ++i)
	        __set_bit(eventTypes[i], inputdev->evbit);

	for (i = 0; i < ARRAY_SIZE(absEvents); ++i)
	        __set_bit(absEvents[i], inputdev->absbit);

	for (i = 0; i < ARRAY_SIZE(relEvents); ++i)
	        __set_bit(relEvents[i], inputdev->relbit);

	__set_bit(MSC_SERIAL, inputdev->mscbit);

	/* Set up key and button codes */
	for (i = 0; i < ARRAY_SIZE(buttonEvents); ++i)
		__set_bit(buttonEvents[i], inputdev->keybit);

	for (i = 0; i < ARRAY_SIZE(macroKeyEvents); ++i)
		__set_bit(macroKeyEvents[i], inputdev->keybit);

	/*
	 * Program the input device coordinate capacities. We do not yet
	 * know what maximum X, Y, and Z values are, so we're putting fake
	 * values in. Later, we'll ask the tablet to put in the correct
	 * values.
	 */
	input_set_abs_params(inputdev, ABS_X, 0, 2999, 0, 0);
	input_set_abs_params(inputdev, ABS_Y, 0, 2249, 0, 0);
	input_set_abs_params(inputdev, ABS_PRESSURE, 0, 511, 0, 0);
	input_set_abs_params(inputdev, ABS_TILT_X, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
	input_set_abs_params(inputdev, ABS_TILT_Y, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
	input_set_abs_params(inputdev, ABS_WHEEL, AIPTEK_WHEEL_MIN, AIPTEK_WHEEL_MAX - 1, 0, 0);

	endpoint = &intf->altsetting[0].endpoint[0].desc;

	/* Go set up our URB, which is called when the tablet receives
	 * input.
	 */
	usb_fill_int_urb(aiptek->urb,
			 aiptek->usbdev,
			 usb_rcvintpipe(aiptek->usbdev,
					endpoint->bEndpointAddress),
			 aiptek->data, 8, aiptek_irq, aiptek,
			 endpoint->bInterval);

	aiptek->urb->transfer_dma = aiptek->data_dma;
	aiptek->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* Program the tablet. This sets the tablet up in the mode
	 * specified in newSetting, and also queries the tablet's
	 * physical capacities.
	 *
	 * Sanity check: if a tablet doesn't like the slow programmatic
	 * delay, we often get sizes of 0x0. Let's use that as an indicator
	 * to try faster delays, up to 25 ms. If that logic fails, well, you'll
	 * have to explain to us how your tablet thinks it's 0x0, and yet that's
	 * not an error :-)
	 */

	for (i = 0; i < ARRAY_SIZE(speeds); ++i) {
		aiptek->curSetting.programmableDelay = speeds[i];
		(void)aiptek_program_tablet(aiptek);
		if (aiptek->inputdev->absmax[ABS_X] > 0) {
			info("input: Aiptek using %d ms programming speed\n",
			     aiptek->curSetting.programmableDelay);
			break;
		}
	}

	/* Murphy says that some day someone will have a tablet that fails the
	   above test. That's you, Frederic Rodrigo */
	if (i == ARRAY_SIZE(speeds)) {
		info("input: Aiptek tried all speeds, no sane response");
		goto fail2;
	}

	/* Associate this driver's struct with the usb interface.
	 */
	usb_set_intfdata(intf, aiptek);

	/* Set up the sysfs files
	 */
	err = sysfs_create_group(&intf->dev.kobj, &aiptek_attribute_group);
	if (err) {
		warn("aiptek: cannot create sysfs group err: %d", err);
		goto fail3;
        }

	/* Register the tablet as an Input Device
	 */
	err = input_register_device(aiptek->inputdev);
	if (err) {
		warn("aiptek: input_register_device returned err: %d", err);
		goto fail4;
        }
	return 0;

 fail4:	sysfs_remove_group(&intf->dev.kobj, &aiptek_attribute_group);
 fail3: usb_free_urb(aiptek->urb);
 fail2:	usb_buffer_free(usbdev, AIPTEK_PACKET_LENGTH, aiptek->data,
			aiptek->data_dma);
 fail1: usb_set_intfdata(intf, NULL);
	input_free_device(inputdev);
	kfree(aiptek);
	return err;
}

/***********************************************************************
 * Deal with tablet disconnecting from the system.
 */
static void aiptek_disconnect(struct usb_interface *intf)
{
	struct aiptek *aiptek = usb_get_intfdata(intf);

	/* Disassociate driver's struct with usb interface
	 */
	usb_set_intfdata(intf, NULL);
	if (aiptek != NULL) {
		/* Free & unhook everything from the system.
		 */
		usb_kill_urb(aiptek->urb);
		input_unregister_device(aiptek->inputdev);
		sysfs_remove_group(&intf->dev.kobj, &aiptek_attribute_group);
		usb_free_urb(aiptek->urb);
		usb_buffer_free(interface_to_usbdev(intf),
				AIPTEK_PACKET_LENGTH,
				aiptek->data, aiptek->data_dma);
		kfree(aiptek);
	}
}

static struct usb_driver aiptek_driver = {
	.name = "aiptek",
	.probe = aiptek_probe,
	.disconnect = aiptek_disconnect,
	.id_table = aiptek_ids,
};

static int __init aiptek_init(void)
{
	int result = usb_register(&aiptek_driver);
	if (result == 0) {
		info(DRIVER_VERSION ": " DRIVER_AUTHOR);
		info(DRIVER_DESC);
	}
	return result;
}

static void __exit aiptek_exit(void)
{
	usb_deregister(&aiptek_driver);
}

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(programmableDelay, int, 0);
MODULE_PARM_DESC(programmableDelay, "delay used during tablet programming");
module_param(jitterDelay, int, 0);
MODULE_PARM_DESC(jitterDelay, "stylus/mouse settlement delay");

module_init(aiptek_init);
module_exit(aiptek_exit);