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Subject[PATCH 35/39] input: Mousedev - better multiplex absolute and relative devices
You can pull this changeset from:
bk://kernel.bkbits.net/vojtech/input-for-linus

===================================================================
ChangeSet@1.1587.27.15, 2004-05-10 01:44:03-05:00, dtor_core@ameritech.net
Input: mousedev - better multiplex absolute and relative devices;
cleanups


mousedev.c | 260 ++++++++++++++++++++++++++++++++++---------------------------
1 files changed, 146 insertions(+), 114 deletions(-)
===================================================================
diff -Nru a/drivers/input/mousedev.c b/drivers/input/mousedev.c
--- a/drivers/input/mousedev.c 2004-06-07 13:10:38 +02:00
+++ b/drivers/input/mousedev.c 2004-06-07 13:10:38 +02:00
@@ -2,6 +2,7 @@
* Input driver to ExplorerPS/2 device driver module.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
+ * Copyright (c) 2004 Dmitry Torokhov
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published by
@@ -47,15 +48,24 @@
module_param(yres, uint, 0);
MODULE_PARM_DESC(yres, "Vertical screen resolution");

+struct mousedev_motion {
+ int dx, dy, dz;
+};
+
struct mousedev {
int exist;
int open;
int minor;
- int misc;
char name[16];
wait_queue_head_t wait;
struct list_head list;
struct input_handle handle;
+
+ struct mousedev_motion packet;
+ unsigned long buttons;
+ unsigned int pkt_count;
+ int old_x[4], old_y[4];
+ unsigned int touch;
};

struct mousedev_list {
@@ -63,13 +73,10 @@
struct mousedev *mousedev;
struct list_head node;
int dx, dy, dz;
- int old_x[4], old_y[4];
unsigned long buttons;
signed char ps2[6];
unsigned char ready, buffer, bufsiz;
unsigned char mode, imexseq, impsseq;
- unsigned int pkt_count;
- unsigned char touch;
};

#define MOUSEDEV_SEQ_LEN 6
@@ -82,135 +89,157 @@
static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
static struct mousedev mousedev_mix;

-#define fx(i) (list->old_x[(list->pkt_count - (i)) & 03])
-#define fy(i) (list->old_y[(list->pkt_count - (i)) & 03])
+#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
+#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])

-static void mousedev_abs_event(struct input_handle *handle, struct mousedev_list *list, unsigned int code, int value)
+static void mousedev_touchpad_event(struct mousedev *mousedev, unsigned int code, int value)
{
- int size;
- int touchpad;
+ if (mousedev->touch) {
+ switch (code) {
+ case ABS_X:
+ fx(0) = value;
+ if (mousedev->pkt_count >= 2)
+ mousedev->packet.dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) / 8;
+ break;

- /* Ignore joysticks */
- if (test_bit(BTN_TRIGGER, handle->dev->keybit))
- return;
+ case ABS_Y:
+ fy(0) = value;
+ if (mousedev->pkt_count >= 2)
+ mousedev->packet.dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) / 8;
+ break;
+ }
+ }
+}

- touchpad = test_bit(BTN_TOOL_FINGER, handle->dev->keybit);
+static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
+{
+ int size;

switch (code) {
case ABS_X:
- if (touchpad) {
- if (list->touch) {
- fx(0) = value;
- if (list->pkt_count >= 2)
- list->dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) / 8;
- }
- } else {
- size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
- if (size == 0) size = xres;
- list->dx += (value * xres - list->old_x[0]) / size;
- list->old_x[0] += list->dx * size;
- }
+ size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
+ if (size == 0) size = xres;
+ mousedev->packet.dx = (value * xres - mousedev->old_x[0]) / size;
+ mousedev->old_x[0] = mousedev->packet.dx * size;
break;
+
case ABS_Y:
- if (touchpad) {
- if (list->touch) {
- fy(0) = value;
- if (list->pkt_count >= 2)
- list->dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) / 8;
- }
- } else {
- size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
- if (size == 0) size = yres;
- list->dy -= (value * yres - list->old_y[0]) / size;
- list->old_y[0] -= list->dy * size;
- }
+ size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
+ if (size == 0) size = yres;
+ mousedev->packet.dy = (value * yres - mousedev->old_y[0]) / size;
+ mousedev->old_y[0] = mousedev->packet.dy * size;
break;
}
}

-static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
+static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
+{
+ switch (code) {
+ case REL_X: mousedev->packet.dx += value; break;
+ case REL_Y: mousedev->packet.dy -= value; break;
+ case REL_WHEEL: mousedev->packet.dz -= value; break;
+ }
+}
+
+static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
+{
+ int index;
+
+ switch (code) {
+ case BTN_TOUCH:
+ case BTN_0:
+ case BTN_FORWARD:
+ case BTN_LEFT: index = 0; break;
+ case BTN_STYLUS:
+ case BTN_1:
+ case BTN_RIGHT: index = 1; break;
+ case BTN_2:
+ case BTN_STYLUS2:
+ case BTN_MIDDLE: index = 2; break;
+ case BTN_3:
+ case BTN_BACK:
+ case BTN_SIDE: index = 3; break;
+ case BTN_4:
+ case BTN_EXTRA: index = 4; break;
+ default: return;
+ }
+
+ if (value) {
+ set_bit(index, &mousedev->buttons);
+ set_bit(index, &mousedev_mix.buttons);
+ } else {
+ clear_bit(index, &mousedev->buttons);
+ clear_bit(index, &mousedev_mix.buttons);
+ }
+}
+
+static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_motion *packet)
{
- struct mousedev *mousedevs[3] = { handle->private, &mousedev_mix, NULL };
- struct mousedev **mousedev = mousedevs;
struct mousedev_list *list;
- int index, wake;

- while (*mousedev) {
+ list_for_each_entry(list, &mousedev->list, node) {
+ list->dx += packet->dx;
+ list->dy += packet->dy;
+ list->dz += packet->dz;
+ list->buttons = mousedev->buttons;
+ list->ready = 1;
+ kill_fasync(&list->fasync, SIGIO, POLL_IN);
+ }
+
+ wake_up_interruptible(&mousedev->wait);
+}
+
+static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
+{
+ struct mousedev *mousedev = handle->private;
+
+ switch (type) {
+ case EV_ABS:
+ /* Ignore joysticks */
+ if (test_bit(BTN_TRIGGER, handle->dev->keybit))
+ return;
+
+ if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
+ mousedev_touchpad_event(mousedev, code, value);
+ else
+ mousedev_abs_event(handle->dev, mousedev, code, value);

- wake = 0;
+ break;
+
+ case EV_REL:
+ mousedev_rel_event(mousedev, code, value);
+ break;

- list_for_each_entry(list, &(*mousedev)->list, node)
- switch (type) {
- case EV_ABS:
- mousedev_abs_event(handle, list, code, value);
- break;
-
- case EV_REL:
- switch (code) {
- case REL_X: list->dx += value; break;
- case REL_Y: list->dy -= value; break;
- case REL_WHEEL: if (list->mode) list->dz -= value; break;
- }
- break;
-
- case EV_KEY:
- if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) {
- /* Handle touchpad data */
- list->touch = value;
- if (!list->touch)
- list->pkt_count = 0;
- break;
- }
-
- switch (code) {
- case BTN_TOUCH:
- case BTN_0:
- case BTN_FORWARD:
- case BTN_LEFT: index = 0; break;
- case BTN_4:
- case BTN_EXTRA: if (list->mode == 2) { index = 4; break; }
- case BTN_STYLUS:
- case BTN_1:
- case BTN_RIGHT: index = 1; break;
- case BTN_3:
- case BTN_BACK:
- case BTN_SIDE: if (list->mode == 2) { index = 3; break; }
- case BTN_2:
- case BTN_STYLUS2:
- case BTN_MIDDLE: index = 2; break;
- default: return;
- }
- switch (value) {
- case 0: clear_bit(index, &list->buttons); break;
- case 1: set_bit(index, &list->buttons); break;
- case 2: return;
- }
- break;
-
- case EV_SYN:
- switch (code) {
- case SYN_REPORT:
- if (list->touch) {
- list->pkt_count++;
- /* Input system eats duplicate events,
- * but we need all of them to do correct
- * averaging so apply present one forward
- */
- fx(0) = fx(1);
- fy(0) = fy(1);
- }
-
- list->ready = 1;
- kill_fasync(&list->fasync, SIGIO, POLL_IN);
- wake = 1;
- break;
- }
+ case EV_KEY:
+ if (value != 2) {
+ if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) {
+ /* Handle touchpad data */
+ mousedev->touch = value;
+ if (!mousedev->touch)
+ mousedev->pkt_count = 0;
+ }
+ else
+ mousedev_key_event(mousedev, code, value);
}
+ break;
+
+ case EV_SYN:
+ if (code == SYN_REPORT) {
+ if (mousedev->touch) {
+ mousedev->pkt_count++;
+ /* Input system eats duplicate events, but we need all of them
+ * to do correct averaging so apply present one forward
+ */
+ fx(0) = fx(1);
+ fy(0) = fy(1);
+ }

- if (wake)
- wake_up_interruptible(&((*mousedev)->wait));
+ mousedev_notify_readers(mousedev, &mousedev->packet);
+ mousedev_notify_readers(&mousedev_mix, &mousedev->packet);

- mousedev++;
+ memset(&mousedev->packet, 0, sizeof(struct mousedev_motion));
+ }
+ break;
}
}

@@ -326,6 +355,8 @@
list->dz -= list->ps2[off + 3];
list->ps2[off + 3] = (list->ps2[off + 3] & 0x0f) | ((list->buttons & 0x18) << 1);
list->bufsiz++;
+ } else {
+ list->ps2[off] |= ((list->buttons & 0x10) >> 3) | ((list->buttons & 0x08) >> 1);
}

if (list->mode == 1) {
@@ -553,6 +584,7 @@
static struct miscdevice psaux_mouse = {
PSMOUSE_MINOR, "psaux", &mousedev_fops
};
+static int psaux_registered;
#endif

static int __init mousedev_init(void)
@@ -572,7 +604,7 @@
NULL, "mice");

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

@@ -584,7 +616,7 @@
static void __exit mousedev_exit(void)
{
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
- if (mousedev_mix.misc)
+ if (psaux_registered)
misc_deregister(&psaux_mouse);
#endif
devfs_remove("input/mice");
-
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