自学教程：C++ BIT_WORD函数代码示例

static int soundtrigger_input_init(struct device *dev){	int error = 0;	soundtrigger_input_dev = input_allocate_device();	if (!soundtrigger_input_dev) {		pr_err("failed to allocate memory for input dev/n");		error = -ENOMEM;		goto err_dev;	}	soundtrigger_input_dev->name = "soundtrigger_input_dev";	soundtrigger_input_dev->evbit[0] = BIT_MASK(EV_KEY);	soundtrigger_input_dev->keybit[BIT_WORD(KEY_F14)] |= BIT_MASK(KEY_F14);	soundtrigger_input_dev->keybit[BIT_WORD(KEY_F15)] |= BIT_MASK(KEY_F15);	soundtrigger_input_dev->keybit[BIT_WORD(KEY_F16)] |= BIT_MASK(KEY_F16);	soundtrigger_input_dev->keybit[BIT_WORD(KEY_F17)] |= BIT_MASK(KEY_F17);	soundtrigger_input_dev->keybit[BIT_WORD(KEY_F18)] |= BIT_MASK(KEY_F18);	error = input_register_device(soundtrigger_input_dev);	if(error < 0) {		pr_err("input register device failed, error_no is %d./n", error);		goto err_free_dev;	}	pr_info("input register device successful./n");	return 0;err_free_dev:	input_free_device(soundtrigger_input_dev);err_dev:	pr_err("error_no is %d./n", error);	return error;}

void input_dev_i3s(struct input_dev *input_dev, struct wacom_wac *wacom_wac){    input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);    input_dev->keybit[BIT_WORD(BTN_LEFT)] |= BIT_MASK(BTN_0) |            BIT_MASK(BTN_1) | BIT_MASK(BTN_2) | BIT_MASK(BTN_3);    input_set_abs_params(input_dev, ABS_RX, 0, 4096, 0, 0);}

void input_dev_i4s(struct input_dev *input_dev, struct wacom_wac *wacom_wac){	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);	input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_0) | BIT_MASK(BTN_1) | BIT_MASK(BTN_2) | BIT_MASK(BTN_3);	input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_4) | BIT_MASK(BTN_5) | BIT_MASK(BTN_6);	input_set_abs_params(input_dev, ABS_Z, -900, 899, 0, 0);}

void input_dev_g4(struct input_dev *input_dev, struct wacom_wac *wacom_wac){	input_dev->evbit[0] |= BIT_MASK(EV_MSC);	input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL);	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);	input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_0) |		BIT_MASK(BTN_4);}

void input_dev_bamboo_pt(struct input_dev *input_dev, struct wacom_wac *wacom_wac){	input_dev->absbit[BIT_WORD(ABS_MISC)] &= ~ABS_MISC;	/* for now, BAMBOO_PT will only handle pen */	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER) |		BIT_MASK(BTN_STYLUS2);	input_set_abs_params(input_dev, ABS_DISTANCE, 0,			     wacom_wac->features->distance_max, 0, 0);}

void input_dev_g(struct input_dev *input_dev, struct wacom_wac *wacom_wac){	input_dev->evbit[0] |= BIT_MASK(EV_REL);	input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);	input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_LEFT) |		BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);	input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER) |		BIT_MASK(BTN_TOOL_MOUSE) | BIT_MASK(BTN_STYLUS2);	input_set_abs_params(input_dev, ABS_DISTANCE, 0, wacom_wac->features->distance_max, 0, 0);}

static int check_fd(struct tslib_input *i){	struct tsdev *ts = i->module.dev;	int version;	long evbit[BITS_TO_LONGS(EV_CNT)];	long absbit[BITS_TO_LONGS(ABS_CNT)];	long keybit[BITS_TO_LONGS(KEY_CNT)];	if (ioctl(ts->fd, EVIOCGVERSION, &version) < 0) {		fprintf(stderr, "tslib: Selected device is not a Linux input event device/n");		return -1;	}	/* support version EV_VERSION 0x010000 and 0x010001	 * this check causes more troubles than it solves here */	if (version < EV_VERSION)		fprintf(stderr, "tslib: Warning: Selected device uses a different version of the event protocol than tslib was compiled for/n");	if ( (ioctl(ts->fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||		!(evbit[BIT_WORD(EV_ABS)] & BIT_MASK(EV_ABS)) ||		!(evbit[BIT_WORD(EV_KEY)] & BIT_MASK(EV_KEY)) ) {		fprintf(stderr, "tslib: Selected device is not a touchscreen (must support ABS and KEY event types)/n");		return -1;	}	if ((ioctl(ts->fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit)) < 0 ||		!(absbit[BIT_WORD(ABS_X)] & BIT_MASK(ABS_X)) ||		!(absbit[BIT_WORD(ABS_Y)] & BIT_MASK(ABS_Y))) {		fprintf(stderr, "tslib: Selected device is not a touchscreen (must support ABS_X and ABS_Y events)/n");		return -1;	}	/* Since some touchscreens (eg. infrared) physically can't measure pressure,	the input system doesn't report it on those. Tslib relies on pressure, thus	we set it to constant 255. It's still controlled by BTN_TOUCH/BTN_LEFT -	when not touched, the pressure is forced to 0. */	if (!(absbit[BIT_WORD(ABS_PRESSURE)] & BIT_MASK(ABS_PRESSURE)))		i->no_pressure = 1;	if ((ioctl(ts->fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||		!(keybit[BIT_WORD(BTN_TOUCH)] & BIT_MASK(BTN_TOUCH) ||		  keybit[BIT_WORD(BTN_LEFT)] & BIT_MASK(BTN_LEFT))) {		fprintf(stderr, "tslib: Selected device is not a touchscreen (must support BTN_TOUCH or BTN_LEFT events)/n");		return -1;	}	if (evbit[BIT_WORD(EV_SYN)] & BIT_MASK(EV_SYN))		i->using_syn = 1;	if (i->grab_events == GRAB_EVENTS_WANTED) {		if (ioctl(ts->fd, EVIOCGRAB, (void *)1)) {			fprintf(stderr, "tslib: Unable to grab selected input device/n");			return -1;		}		i->grab_events = GRAB_EVENTS_ACTIVE;	}	return ts->fd;}

int bfilter_get_hash(struct bloom_filter *bf, unsigned long hash){	unsigned long *addr;	hash = hash % bf->nbits;	addr = bf->bitmap + BIT_WORD(hash);	return test_bit(hash & (BITS_PER_LONG - 1), addr);}

static void copy_abs(struct input_dev *dev, unsigned int dst, unsigned int src){	if (dev->absinfo && test_bit(src, dev->absbit)) {		dev->absinfo[dst] = dev->absinfo[src];		dev->absbit[BIT_WORD(dst)] |= BIT_MASK(dst);	}}

/** * Init function. * Allocates interrupt for power button and registers itself to input layer. */static int __init retubutton_init(void){	int irq;	printk(KERN_INFO "Retu power button driver initialized/n");	irq = RETU_INT_PWR;	init_timer(&pwrbtn_timer);	pwrbtn_timer.function = retubutton_timer_func;	if (retu_request_irq(irq, &retubutton_irq, 0, "PwrOnX") < 0) {		printk(KERN_ERR "%[email
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