input.c

linux 内核源代码

}

static int input_default_setkeycode(struct input_dev *dev,
				    int scancode, int keycode)
{
	int old_keycode;
	int i;

	if (scancode < 0 || scancode >= dev->keycodemax)
		return -EINVAL;

	if (keycode < 0 || keycode > KEY_MAX)
		return -EINVAL;

	if (!dev->keycodesize)
		return -EINVAL;

	if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
		return -EINVAL;

	switch (dev->keycodesize) {
		case 1: {
			u8 *k = (u8 *)dev->keycode;
			old_keycode = k[scancode];
			k[scancode] = keycode;
			break;
		}
		case 2: {
			u16 *k = (u16 *)dev->keycode;
			old_keycode = k[scancode];
			k[scancode] = keycode;
			break;
		}
		default: {
			u32 *k = (u32 *)dev->keycode;
			old_keycode = k[scancode];
			k[scancode] = keycode;
			break;
		}
	}

	clear_bit(old_keycode, dev->keybit);
	set_bit(keycode, dev->keybit);

	for (i = 0; i < dev->keycodemax; i++) {
		if (input_fetch_keycode(dev, i) == old_keycode) {
			set_bit(old_keycode, dev->keybit);
			break; /* Setting the bit twice is useless, so break */
		}
	}

	return 0;
}


#define MATCH_BIT(bit, max) \
		for (i = 0; i < BITS_TO_LONGS(max); i++) \
			if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
				break; \
		if (i != BITS_TO_LONGS(max)) \
			continue;

static const struct input_device_id *input_match_device(const struct input_device_id *id,
							struct input_dev *dev)
{
	int i;

	for (; id->flags || id->driver_info; id++) {

		if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
			if (id->bustype != dev->id.bustype)
				continue;

		if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
			if (id->vendor != dev->id.vendor)
				continue;

		if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
			if (id->product != dev->id.product)
				continue;

		if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
			if (id->version != dev->id.version)
				continue;

		MATCH_BIT(evbit,  EV_MAX);
		MATCH_BIT(keybit, KEY_MAX);
		MATCH_BIT(relbit, REL_MAX);
		MATCH_BIT(absbit, ABS_MAX);
		MATCH_BIT(mscbit, MSC_MAX);
		MATCH_BIT(ledbit, LED_MAX);
		MATCH_BIT(sndbit, SND_MAX);
		MATCH_BIT(ffbit,  FF_MAX);
		MATCH_BIT(swbit,  SW_MAX);

		return id;
	}

	return NULL;
}

static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
{
	const struct input_device_id *id;
	int error;

	if (handler->blacklist && input_match_device(handler->blacklist, dev))
		return -ENODEV;

	id = input_match_device(handler->id_table, dev);
	if (!id)
		return -ENODEV;

	error = handler->connect(handler, dev, id);
	if (error && error != -ENODEV)
		printk(KERN_ERR
			"input: failed to attach handler %s to device %s, "
			"error: %d\n",
			handler->name, kobject_name(&dev->dev.kobj), error);

	return error;
}


#ifdef CONFIG_PROC_FS

static struct proc_dir_entry *proc_bus_input_dir;
static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
static int input_devices_state;

static inline void input_wakeup_procfs_readers(void)
{
	input_devices_state++;
	wake_up(&input_devices_poll_wait);
}

static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
{
	int state = input_devices_state;

	poll_wait(file, &input_devices_poll_wait, wait);
	if (state != input_devices_state)
		return POLLIN | POLLRDNORM;

	return 0;
}

static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
{
	if (mutex_lock_interruptible(&input_mutex))
		return NULL;

	return seq_list_start(&input_dev_list, *pos);
}

static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	return seq_list_next(v, &input_dev_list, pos);
}

static void input_devices_seq_stop(struct seq_file *seq, void *v)
{
	mutex_unlock(&input_mutex);
}

static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
				   unsigned long *bitmap, int max)
{
	int i;

	for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
		if (bitmap[i])
			break;

	seq_printf(seq, "B: %s=", name);
	for (; i >= 0; i--)
		seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
	seq_putc(seq, '\n');
}

static int input_devices_seq_show(struct seq_file *seq, void *v)
{
	struct input_dev *dev = container_of(v, struct input_dev, node);
	const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
	struct input_handle *handle;

	seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
		   dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);

	seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
	seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
	seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
	seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
	seq_printf(seq, "H: Handlers=");

	list_for_each_entry(handle, &dev->h_list, d_node)
		seq_printf(seq, "%s ", handle->name);
	seq_putc(seq, '\n');

	input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
	if (test_bit(EV_KEY, dev->evbit))
		input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
	if (test_bit(EV_REL, dev->evbit))
		input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
	if (test_bit(EV_ABS, dev->evbit))
		input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
	if (test_bit(EV_MSC, dev->evbit))
		input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
	if (test_bit(EV_LED, dev->evbit))
		input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
	if (test_bit(EV_SND, dev->evbit))
		input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
	if (test_bit(EV_FF, dev->evbit))
		input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
	if (test_bit(EV_SW, dev->evbit))
		input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);

	seq_putc(seq, '\n');

	kfree(path);
	return 0;
}

static struct seq_operations input_devices_seq_ops = {
	.start	= input_devices_seq_start,
	.next	= input_devices_seq_next,
	.stop	= input_devices_seq_stop,
	.show	= input_devices_seq_show,
};

static int input_proc_devices_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &input_devices_seq_ops);
}

static const struct file_operations input_devices_fileops = {
	.owner		= THIS_MODULE,
	.open		= input_proc_devices_open,
	.poll		= input_proc_devices_poll,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
{
	if (mutex_lock_interruptible(&input_mutex))
		return NULL;

	seq->private = (void *)(unsigned long)*pos;
	return seq_list_start(&input_handler_list, *pos);
}

static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	seq->private = (void *)(unsigned long)(*pos + 1);
	return seq_list_next(v, &input_handler_list, pos);
}

static void input_handlers_seq_stop(struct seq_file *seq, void *v)
{
	mutex_unlock(&input_mutex);
}

static int input_handlers_seq_show(struct seq_file *seq, void *v)
{
	struct input_handler *handler = container_of(v, struct input_handler, node);

	seq_printf(seq, "N: Number=%ld Name=%s",
		   (unsigned long)seq->private, handler->name);
	if (handler->fops)
		seq_printf(seq, " Minor=%d", handler->minor);
	seq_putc(seq, '\n');

	return 0;
}
static struct seq_operations input_handlers_seq_ops = {
	.start	= input_handlers_seq_start,
	.next	= input_handlers_seq_next,
	.stop	= input_handlers_seq_stop,
	.show	= input_handlers_seq_show,
};

static int input_proc_handlers_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &input_handlers_seq_ops);
}

static const struct file_operations input_handlers_fileops = {
	.owner		= THIS_MODULE,
	.open		= input_proc_handlers_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init input_proc_init(void)
{
	struct proc_dir_entry *entry;

	proc_bus_input_dir = proc_mkdir("input", proc_bus);
	if (!proc_bus_input_dir)
		return -ENOMEM;

	proc_bus_input_dir->owner = THIS_MODULE;

	entry = create_proc_entry("devices", 0, proc_bus_input_dir);
	if (!entry)
		goto fail1;

	entry->owner = THIS_MODULE;
	entry->proc_fops = &input_devices_fileops;

	entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
	if (!entry)
		goto fail2;

	entry->owner = THIS_MODULE;
	entry->proc_fops = &input_handlers_fileops;

	return 0;

 fail2:	remove_proc_entry("devices", proc_bus_input_dir);
 fail1: remove_proc_entry("input", proc_bus);
	return -ENOMEM;
}

static void input_proc_exit(void)
{
	remove_proc_entry("devices", proc_bus_input_dir);
	remove_proc_entry("handlers", proc_bus_input_dir);
	remove_proc_entry("input", proc_bus);
}

#else /* !CONFIG_PROC_FS */
static inline void input_wakeup_procfs_readers(void) { }
static inline int input_proc_init(void) { return 0; }
static inline void input_proc_exit(void) { }
#endif

#define INPUT_DEV_STRING_ATTR_SHOW(name)				\
static ssize_t input_dev_show_##name(struct device *dev,		\
				     struct device_attribute *attr,	\
				     char *buf)				\
{									\
	struct input_dev *input_dev = to_input_dev(dev);		\
									\
	return scnprintf(buf, PAGE_SIZE, "%s\n",			\
			 input_dev->name ? input_dev->name : "");	\
}									\
static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)

INPUT_DEV_STRING_ATTR_SHOW(name);
INPUT_DEV_STRING_ATTR_SHOW(phys);
INPUT_DEV_STRING_ATTR_SHOW(uniq);

static int input_print_modalias_bits(char *buf, int size,
				     char name, unsigned long *bm,
				     unsigned int min_bit, unsigned int max_bit)
{
	int len = 0, i;

	len += snprintf(buf, max(size, 0), "%c", name);
	for (i = min_bit; i < max_bit; i++)
		if (bm[BIT_WORD(i)] & BIT_MASK(i))
			len += snprintf(buf + len, max(size - len, 0), "%X,", i);
	return len;
}

static int input_print_modalias(char *buf, int size, struct input_dev *id,
				int add_cr)
{
	int len;

	len = snprintf(buf, max(size, 0),
		       "input:b%04Xv%04Xp%04Xe%04X-",
		       id->id.bustype, id->id.vendor,
		       id->id.product, id->id.version);

	len += input_print_modalias_bits(buf + len, size - len,
				'e', id->evbit, 0, EV_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'r', id->relbit, 0, REL_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'a', id->absbit, 0, ABS_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'm', id->mscbit, 0, MSC_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'l', id->ledbit, 0, LED_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				's', id->sndbit, 0, SND_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'f', id->ffbit, 0, FF_MAX);
	len += input_print_modalias_bits(buf + len, size - len,
				'w', id->swbit, 0, SW_MAX);

	if (add_cr)
		len += snprintf(buf + len, max(size - len, 0), "\n");

	return len;
}

static ssize_t input_dev_show_modalias(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct input_dev *id = to_input_dev(dev);
	ssize_t len;

	len = input_print_modalias(buf, PAGE_SIZE, id, 1);

	return min_t(int, len, PAGE_SIZE);
}
static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);

static struct attribute *input_dev_attrs[] = {
	&dev_attr_name.attr,
	&dev_attr_phys.attr,
	&dev_attr_uniq.attr,
	&dev_attr_modalias.attr,
	NULL
};

static struct attribute_group input_dev_attr_group = {
	.attrs	= input_dev_attrs,
};

#define INPUT_DEV_ID_ATTR(name)						\
static ssize_t input_dev_show_id_##name(struct device *dev,		\
					struct device_attribute *attr,	\
					char *buf)			\
{									\
	struct input_dev *input_dev = to_input_dev(dev);		\
	return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);	\
}									\
static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)

INPUT_DEV_ID_ATTR(bustype);
INPUT_DEV_ID_ATTR(vendor);
INPUT_DEV_ID_ATTR(product);
INPUT_DEV_ID_ATTR(version);

static struct attribute *input_dev_id_attrs[] = {
	&dev_attr_bustype.attr,
	&dev_attr_vendor.attr,
	&dev_attr_product.attr,
	&dev_attr_version.attr,
	NULL
};

static struct attribute_group input_dev_id_attr_group = {
	.name	= "id",
	.attrs	= input_dev_id_attrs,
};

static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
			      int max, int add_cr)
{
	int i;
	int len = 0;

	for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
		if (bitmap[i])
			break;

	for (; i >= 0; i--)
		len += snprintf(buf + len, max(buf_size - len, 0),
				"%lx%s", bitmap[i], i > 0 ? " " : "");

	if (add_cr)
		len += snprintf(buf + len, max(buf_size - len, 0), "\n");

	return len;
}

#define INPUT_DEV_CAP_ATTR(ev, bm)					\
static ssize_t input_dev_show_cap_##bm(struct device *dev,		\
				       struct device_attribute *attr,	\
				       char *buf)			\
{									\
	struct input_dev *input_dev = to_input_dev(dev);		\
	int len = input_print_bitmap(buf, PAGE_SIZE,			\
				     input_dev->bm##bit, ev##_MAX, 1);	\
	return min_t(int, len, PAGE_SIZE);				\
}									\
static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)

INPUT_DEV_CAP_ATTR(EV, ev);
INPUT_DEV_CAP_ATTR(KEY, key);
INPUT_DEV_CAP_ATTR(REL, rel);
INPUT_DEV_CAP_ATTR(ABS, abs);
INPUT_DEV_CAP_ATTR(MSC, msc);
INPUT_DEV_CAP_ATTR(LED, led);
INPUT_DEV_CAP_ATTR(SND, snd);
INPUT_DEV_CAP_ATTR(FF, ff);
INPUT_DEV_CAP_ATTR(SW, sw);

static struct attribute *input_dev_caps_attrs[] = {
	&dev_attr_ev.attr,
	&dev_attr_key.attr,
	&dev_attr_rel.attr,
	&dev_attr_abs.attr,
	&dev_attr_msc.attr,
	&dev_attr_led.attr,
	&dev_attr_snd.attr,
	&dev_attr_ff.attr,
	&dev_attr_sw.attr,
	NULL
};

static struct attribute_group input_dev_caps_attr_group = {
	.name	= "capabilities",
	.attrs	= input_dev_caps_attrs,
};

static struct attribute_group *input_dev_attr_groups[] = {
	&input_dev_attr_group,
	&input_dev_id_attr_group,
	&input_dev_caps_attr_group,
	NULL
};

static void input_dev_release(struct device *device)
{
	struct input_dev *dev = to_input_dev(device);

	input_ff_destroy(dev);
	kfree(dev);

	module_put(THIS_MODULE);
}