patch-2.2.18 linux/drivers/usb/input.c

• Lines: 410
• Date: Sat Sep 30 17:28:18 2000
• Orig file: v2.2.17/drivers/usb/input.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/input.c linux/drivers/usb/input.c
@@ -0,0 +1,409 @@
+/*
+ * $Id: input.c,v 1.7 2000/05/28 17:31:36 vojtech Exp $
+ *
+ *  Copyright (c) 1999-2000 Vojtech Pavlik
+ *
+ *  The input layer module itself
+ *
+ *  Sponsored by SuSE
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or 
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 
+ * Should you need to contact me, the author, you can do so either by
+ * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
+ * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
+ */
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/kcomp.h>
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
+MODULE_DESCRIPTION("Input layer module");
+
+EXPORT_SYMBOL(input_register_device);
+EXPORT_SYMBOL(input_unregister_device);
+EXPORT_SYMBOL(input_register_handler);
+EXPORT_SYMBOL(input_unregister_handler);
+EXPORT_SYMBOL(input_register_minor);
+EXPORT_SYMBOL(input_unregister_minor);
+EXPORT_SYMBOL(input_open_device);
+EXPORT_SYMBOL(input_close_device);
+EXPORT_SYMBOL(input_event);
+
+#define INPUT_MAJOR	13
+#define INPUT_DEVICES	256
+
+static struct input_dev *input_dev = NULL;
+static struct input_handler *input_handler = NULL;
+static struct input_handler *input_table[8] = { NULL, /* ... */ };
+static devfs_handle_t input_devfs_handle = NULL;
+static int input_number = 0;
+static long input_devices[NBITS(INPUT_DEVICES)] = { 0, /* ... */ };
+
+void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
+{
+	struct input_handle *handle = dev->handle;
+
+/*
+ * Filter non-events, and bad input values out.
+ */
+
+	if (type > EV_MAX || !test_bit(type, dev->evbit))
+		return;
+
+	switch (type) {
+
+		case EV_KEY:
+
+			if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
+				return;
+
+			if (value == 2) break;
+
+			change_bit(code, dev->key);
+
+			if (test_bit(EV_REP, dev->evbit) && dev->timer.function) {
+				if (value) {
+					mod_timer(&dev->timer, jiffies + dev->rep[REP_DELAY]);
+					dev->repeat_key = code;
+					break;
+				}
+				if (dev->repeat_key == code)
+					del_timer(&dev->timer);
+			}
+
+			break;
+		
+		case EV_ABS:
+
+			if (code > ABS_MAX || !test_bit(code, dev->absbit))
+				return;
+
+			if (dev->absfuzz[code]) {
+				if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
+				    (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
+					return;
+
+				if ((value > dev->abs[code] - dev->absfuzz[code]) &&
+				    (value < dev->abs[code] + dev->absfuzz[code]))
+					value = (dev->abs[code] * 3 + value) >> 2;
+
+				if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
+				    (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
+					value = (dev->abs[code] + value) >> 1;
+			}
+
+			if (dev->abs[code] == value)
+				return;
+
+			dev->abs[code] = value;
+			break;
+
+		case EV_REL:
+
+			if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
+				return;
+
+			break;
+
+		case EV_LED:
+	
+			if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
+				return;
+
+			change_bit(code, dev->led);
+			if (dev->event) dev->event(dev, type, code, value);	
+	
+			break;
+
+		case EV_SND:
+	
+			if (code > SND_MAX || !test_bit(code, dev->sndbit) || !!test_bit(code, dev->snd) == value)
+				return;
+
+			change_bit(code, dev->snd);
+			if (dev->event) dev->event(dev, type, code, value);	
+	
+			break;
+
+		case EV_REP:
+
+			if (code > REP_MAX || dev->rep[code] == value) return;
+
+			dev->rep[code] = value;
+			if (dev->event) dev->event(dev, type, code, value);
+
+			break;
+	}
+/*
+ * Add randomness.
+ */
+
+#if 0 /* BUG */
+	add_input_randomness(((unsigned long) dev) ^ (type << 24) ^ (code << 16) ^ value);
+#endif
+
+/*
+ * Distribute the event to handler modules.
+ */
+
+	while (handle) {
+		if (handle->open)
+			handle->handler->event(handle, type, code, value);
+		handle = handle->dnext;
+	}
+}
+
+static void input_repeat_key(unsigned long data)
+{
+	struct input_dev *dev = (void *) data;
+	input_event(dev, EV_KEY, dev->repeat_key, 2);
+	mod_timer(&dev->timer, jiffies + dev->rep[REP_PERIOD]);
+}
+
+int input_open_device(struct input_handle *handle)
+{
+	handle->open++;
+	if (handle->dev->open)
+		return handle->dev->open(handle->dev);
+	return 0;
+}
+
+void input_close_device(struct input_handle *handle)
+{
+	if (handle->dev->close)
+		handle->dev->close(handle->dev);
+	handle->open--;
+}
+
+static void input_link_handle(struct input_handle *handle)
+{
+	handle->dnext = handle->dev->handle;
+	handle->hnext = handle->handler->handle;
+	handle->dev->handle = handle;
+	handle->handler->handle = handle;
+}
+
+static void input_unlink_handle(struct input_handle *handle)
+{
+	struct input_handle **handleptr;
+
+	handleptr = &handle->dev->handle;
+	while (*handleptr && (*handleptr != handle))
+		handleptr = &((*handleptr)->dnext);
+	*handleptr = (*handleptr)->dnext;
+
+	handleptr = &handle->handler->handle;
+	while (*handleptr && (*handleptr != handle))
+		handleptr = &((*handleptr)->hnext);
+	*handleptr = (*handleptr)->hnext;
+}
+
+void input_register_device(struct input_dev *dev)
+{
+	struct input_handler *handler = input_handler;
+	struct input_handle *handle;
+
+/*
+ * Initialize repeat timer to default values.
+ */
+
+	init_timer(&dev->timer);
+	dev->timer.data = (long) dev;
+	dev->timer.function = input_repeat_key;
+	dev->rep[REP_DELAY] = HZ/4;
+	dev->rep[REP_PERIOD] = HZ/33;
+
+/*
+ * Add the device.
+ */
+
+	if (input_number >= INPUT_DEVICES) {
+		printk(KERN_WARNING "input: ran out of input device numbers!\n");
+		dev->number = input_number;
+	} else {
+		dev->number = find_first_zero_bit(input_devices, INPUT_DEVICES);
+		set_bit(dev->number, input_devices);
+	}
+		
+	dev->next = input_dev;	
+	input_dev = dev;
+	input_number++;
+
+/*
+ * Notify handlers.
+ */
+
+	while (handler) {
+		if ((handle = handler->connect(handler, dev)))
+			input_link_handle(handle);
+		handler = handler->next;
+	}
+}
+
+void input_unregister_device(struct input_dev *dev)
+{
+	struct input_handle *handle = dev->handle;
+	struct input_dev **devptr = &input_dev;
+	struct input_handle *dnext;
+
+/*
+ * Kill any pending repeat timers.
+ */
+
+	del_timer(&dev->timer);
+
+/*
+ * Notify handlers.
+ */
+
+	while (handle) {
+		dnext = handle->dnext;
+		input_unlink_handle(handle);
+		handle->handler->disconnect(handle);
+		handle = dnext;
+	}
+
+/*
+ * Remove the device.
+ */
+
+	while (*devptr && (*devptr != dev))
+		devptr = &((*devptr)->next);
+	*devptr = (*devptr)->next;
+
+	input_number--;
+
+	if (dev->number < INPUT_DEVICES)
+		clear_bit(dev->number, input_devices);
+}
+
+void input_register_handler(struct input_handler *handler)
+{
+	struct input_dev *dev = input_dev;
+	struct input_handle *handle;
+
+/*
+ * Add minors if needed.
+ */
+
+	if (handler->fops != NULL)
+		input_table[handler->minor >> 5] = handler;
+
+/*
+ * Add the handler.
+ */
+
+	handler->next = input_handler;	
+	input_handler = handler;
+	
+/*
+ * Notify it about all existing devices.
+ */
+
+	while (dev) {
+		if ((handle = handler->connect(handler, dev)))
+			input_link_handle(handle);
+		dev = dev->next;
+	}
+}
+
+void input_unregister_handler(struct input_handler *handler)
+{
+	struct input_handler **handlerptr = &input_handler;
+	struct input_handle *handle = handler->handle;
+	struct input_handle *hnext;
+
+/*
+ * Tell the handler to disconnect from all devices it keeps open.
+ */
+
+	while (handle) {
+		hnext = handle->hnext;
+		input_unlink_handle(handle);
+		handler->disconnect(handle);
+		handle = hnext;
+	}
+
+/*
+ * Remove it.
+ */
+
+	while (*handlerptr && (*handlerptr != handler))
+		handlerptr = &((*handlerptr)->next);
+
+	*handlerptr = (*handlerptr)->next;
+
+/*
+ * Remove minors.
+ */
+
+	if (handler->fops != NULL)
+		input_table[handler->minor >> 5] = NULL;
+}
+
+static int input_open_file(struct inode *inode, struct file *file)
+{
+	struct input_handler *handler = input_table[MINOR(inode->i_rdev) >> 5];
+
+	if (!handler || !handler->fops || !handler->fops->open)
+		return -ENODEV;
+
+	file->f_op = handler->fops;
+
+	return handler->fops->open(inode, file);
+}
+
+static struct file_operations input_fops = {
+	open: input_open_file,
+};
+
+devfs_handle_t input_register_minor(char *name, int minor, int minor_base)
+{
+	char devfs_name[16];
+	sprintf(devfs_name, name, minor);
+	return devfs_register(input_devfs_handle, devfs_name, DEVFS_FL_DEFAULT, INPUT_MAJOR, minor + minor_base,
+		S_IFCHR | S_IRUGO | S_IWUSR, &input_fops, NULL);
+}
+
+void input_unregister_minor(devfs_handle_t handle)
+{
+	devfs_unregister(handle);
+}
+
+static int __init input_init(void)
+{
+	if (devfs_register_chrdev(INPUT_MAJOR, "input", &input_fops)) {
+		printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
+		return -EBUSY;
+	}
+	input_devfs_handle = devfs_mk_dir(NULL, "input", 5, NULL);
+	return 0;
+}
+
+static void __exit input_exit(void)
+{
+	devfs_unregister(input_devfs_handle);
+        if (devfs_unregister_chrdev(INPUT_MAJOR, "input"))
+                printk(KERN_ERR "input: can't unregister char major %d", INPUT_MAJOR);
+}
+
+module_init(input_init);
+module_exit(input_exit);