mousedev.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 740 行 · 第 1/2 页

			else
				mousedev_free(list->mousedev);
		}
	}

	kfree(list);
	return 0;
}

static int mousedev_open(struct inode * inode, struct file * file)
{
	struct mousedev_list *list;
	struct input_handle *handle;
	struct mousedev *mousedev;
	int i;

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	if (imajor(inode) == MISC_MAJOR)
		i = MOUSEDEV_MIX;
	else
#endif
		i = iminor(inode) - MOUSEDEV_MINOR_BASE;

	if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
		return -ENODEV;

	if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
		return -ENOMEM;
	memset(list, 0, sizeof(struct mousedev_list));

	spin_lock_init(&list->packet_lock);
	list->pos_x = xres / 2;
	list->pos_y = yres / 2;
	list->mousedev = mousedev_table[i];
	list_add_tail(&list->node, &mousedev_table[i]->list);
	file->private_data = list;

	if (!list->mousedev->open++) {
		if (list->mousedev->minor == MOUSEDEV_MIX) {
			list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
				mousedev = handle->private;
				if (!mousedev->open && mousedev->exist)
					input_open_device(handle);
			}
		} else
			if (!mousedev_mix.open && list->mousedev->exist)
				input_open_device(&list->mousedev->handle);
	}

	return 0;
}

static inline int mousedev_limit_delta(int delta, int limit)
{
	return delta > limit ? limit : (delta < -limit ? -limit : delta);
}

static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data)
{
	struct mousedev_motion *p;
	unsigned long flags;

	spin_lock_irqsave(&list->packet_lock, flags);
	p = &list->packets[list->tail];

	ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
	ps2_data[1] = mousedev_limit_delta(p->dx, 127);
	ps2_data[2] = mousedev_limit_delta(p->dy, 127);
	p->dx -= ps2_data[1];
	p->dy -= ps2_data[2];

	switch (list->mode) {
		case MOUSEDEV_EMUL_EXPS:
			ps2_data[3] = mousedev_limit_delta(p->dz, 127);
			p->dz -= ps2_data[3];
			ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
			list->bufsiz = 4;
			break;

		case MOUSEDEV_EMUL_IMPS:
			ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
			ps2_data[3] = mousedev_limit_delta(p->dz, 127);
			p->dz -= ps2_data[3];
			list->bufsiz = 4;
			break;

		case MOUSEDEV_EMUL_PS2:
		default:
			ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
			p->dz = 0;
			list->bufsiz = 3;
			break;
	}

	if (!p->dx && !p->dy && !p->dz) {
		if (list->tail != list->head)
			list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
		if (list->tail == list->head)
			list->ready = 0;
	}

	spin_unlock_irqrestore(&list->packet_lock, flags);
}


static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
{
	struct mousedev_list *list = file->private_data;
	unsigned char c;
	unsigned int i;

	for (i = 0; i < count; i++) {

		if (get_user(c, buffer + i))
			return -EFAULT;

		if (c == mousedev_imex_seq[list->imexseq]) {
			if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
				list->imexseq = 0;
				list->mode = MOUSEDEV_EMUL_EXPS;
			}
		} else list->imexseq = 0;

		if (c == mousedev_imps_seq[list->impsseq]) {
			if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
				list->impsseq = 0;
				list->mode = MOUSEDEV_EMUL_IMPS;
			}
		} else list->impsseq = 0;

		list->ps2[0] = 0xfa;

		switch (c) {

			case 0xeb: /* Poll */
				mousedev_packet(list, &list->ps2[1]);
				list->bufsiz++; /* account for leading ACK */
				break;

			case 0xf2: /* Get ID */
				switch (list->mode) {
					case MOUSEDEV_EMUL_PS2:  list->ps2[1] = 0; break;
					case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
					case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
				}
				list->bufsiz = 2;
				break;

			case 0xe9: /* Get info */
				list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
				list->bufsiz = 4;
				break;

			case 0xff: /* Reset */
				list->impsseq = list->imexseq = 0;
				list->mode = MOUSEDEV_EMUL_PS2;
				list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
				list->bufsiz = 3;
				break;

			default:
				list->bufsiz = 1;
				break;
		}

		list->buffer = list->bufsiz;
	}

	kill_fasync(&list->fasync, SIGIO, POLL_IN);

	wake_up_interruptible(&list->mousedev->wait);

	return count;
}

static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
{
	struct mousedev_list *list = file->private_data;
	int retval = 0;

	if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
		return -EAGAIN;

	retval = wait_event_interruptible(list->mousedev->wait,
					  !list->mousedev->exist || list->ready || list->buffer);

	if (retval)
		return retval;

	if (!list->mousedev->exist)
		return -ENODEV;

	if (!list->buffer && list->ready) {
		mousedev_packet(list, list->ps2);
		list->buffer = list->bufsiz;
	}

	if (count > list->buffer)
		count = list->buffer;

	list->buffer -= count;

	if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
		return -EFAULT;

	return count;
}

/* No kernel lock - fine */
static unsigned int mousedev_poll(struct file *file, poll_table *wait)
{
	struct mousedev_list *list = file->private_data;
	poll_wait(file, &list->mousedev->wait, wait);
	if (list->ready || list->buffer)
		return POLLIN | POLLRDNORM;
	return 0;
}

struct file_operations mousedev_fops = {
	.owner =	THIS_MODULE,
	.read =		mousedev_read,
	.write =	mousedev_write,
	.poll =		mousedev_poll,
	.open =		mousedev_open,
	.release =	mousedev_release,
	.fasync =	mousedev_fasync,
};

static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
{
	struct mousedev *mousedev;
	int minor = 0;

	for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
	if (minor == MOUSEDEV_MINORS) {
		printk(KERN_ERR "mousedev: no more free mousedev devices\n");
		return NULL;
	}

	if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
		return NULL;
	memset(mousedev, 0, sizeof(struct mousedev));

	INIT_LIST_HEAD(&mousedev->list);
	init_waitqueue_head(&mousedev->wait);

	mousedev->minor = minor;
	mousedev->exist = 1;
	mousedev->handle.dev = dev;
	mousedev->handle.name = mousedev->name;
	mousedev->handle.handler = handler;
	mousedev->handle.private = mousedev;
	sprintf(mousedev->name, "mouse%d", minor);

	if (mousedev_mix.open)
		input_open_device(&mousedev->handle);

	mousedev_table[minor] = mousedev;

	devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
			S_IFCHR|S_IRUGO|S_IWUSR, "input/mouse%d", minor);
	class_simple_device_add(input_class,
				MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
				dev->dev, "mouse%d", minor);

	return &mousedev->handle;
}

static void mousedev_disconnect(struct input_handle *handle)
{
	struct mousedev *mousedev = handle->private;

	mousedev->exist = 0;

	if (mousedev->open) {
		input_close_device(handle);
	} else {
		if (mousedev_mix.open)
			input_close_device(handle);
		mousedev_free(mousedev);
	}
}

static struct input_device_id mousedev_ids[] = {
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
		.evbit = { BIT(EV_KEY) | BIT(EV_REL) },
		.keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
		.relbit = { BIT(REL_X) | BIT(REL_Y) },
	},	/* A mouse like device, at least one button, two relative axes */
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
		.evbit = { BIT(EV_KEY) | BIT(EV_REL) },
		.relbit = { BIT(REL_WHEEL) },
	},	/* A separate scrollwheel */
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
		.evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
		.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
		.absbit = { BIT(ABS_X) | BIT(ABS_Y) },
	},	/* A tablet like device, at least touch detection, two absolute axes */
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
		.evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
		.keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
		.absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
	},	/* A touchpad */

	{ }, 	/* Terminating entry */
};

MODULE_DEVICE_TABLE(input, mousedev_ids);

static struct input_handler mousedev_handler = {
	.event =	mousedev_event,
	.connect =	mousedev_connect,
	.disconnect =	mousedev_disconnect,
	.fops =		&mousedev_fops,
	.minor =	MOUSEDEV_MINOR_BASE,
	.name =		"mousedev",
	.id_table =	mousedev_ids,
};

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
static struct miscdevice psaux_mouse = {
	PSMOUSE_MINOR, "psaux", &mousedev_fops
};
static int psaux_registered;
#endif

static int __init mousedev_init(void)
{
	input_register_handler(&mousedev_handler);

	memset(&mousedev_mix, 0, sizeof(struct mousedev));
	INIT_LIST_HEAD(&mousedev_mix.list);
	init_waitqueue_head(&mousedev_mix.wait);
	mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
	mousedev_mix.exist = 1;
	mousedev_mix.minor = MOUSEDEV_MIX;

	devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
			S_IFCHR|S_IRUGO|S_IWUSR, "input/mice");
	class_simple_device_add(input_class, MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
				NULL, "mice");

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	if (!(psaux_registered = !misc_register(&psaux_mouse)))
		printk(KERN_WARNING "mice: could not misc_register the device\n");
#endif

	printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");

	return 0;
}

static void __exit mousedev_exit(void)
{
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	if (psaux_registered)
		misc_deregister(&psaux_mouse);
#endif
	devfs_remove("input/mice");
	class_simple_device_remove(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
	input_unregister_handler(&mousedev_handler);
}

module_init(mousedev_init);
module_exit(mousedev_exit);