linux/drivers/hid/hid-3m-pct.c
Henrik Rydberg c5f4dec1ce input: mt: Move tracking and pointer emulation to input-mt
The drivers using the type B protocol all report tracking information
the same way. The contact id is semantically equivalent to
ABS_MT_SLOT, and the handling of ABS_MT_TRACKING_ID only complicates
the driver. The situation can be improved upon by providing a common
pointer emulation code, thereby removing the need for the tracking id
in the driver.  This patch moves all tracking event handling over to
the input core, simplifying both the existing drivers and the ones
currently in preparation.

Acked-by: Ping Cheng <pingc@wacom.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
2010-12-16 10:41:38 +01:00

305 lines
7.4 KiB
C

/*
* HID driver for 3M PCT multitouch panels
*
* Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
* Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
* Copyright (c) 2010 Canonical, Ltd.
*
*/
/*
* 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.
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/input/mt.h>
MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
MODULE_DESCRIPTION("3M PCT multitouch panels");
MODULE_LICENSE("GPL");
#include "hid-ids.h"
#define MAX_SLOTS 60
/* estimated signal-to-noise ratios */
#define SN_MOVE 2048
#define SN_WIDTH 128
struct mmm_finger {
__s32 x, y, w, h;
bool touch, valid;
};
struct mmm_data {
struct mmm_finger f[MAX_SLOTS];
__u8 curid;
__u8 nexp, nreal;
bool touch, valid;
};
static int mmm_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
int f1 = field->logical_minimum;
int f2 = field->logical_maximum;
int df = f2 - f1;
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_BUTTON:
return -1;
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
input_set_abs_params(hi->input, ABS_MT_POSITION_X,
f1, f2, df / SN_MOVE, 0);
/* touchscreen emulation */
input_set_abs_params(hi->input, ABS_X,
f1, f2, df / SN_MOVE, 0);
return 1;
case HID_GD_Y:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
input_set_abs_params(hi->input, ABS_MT_POSITION_Y,
f1, f2, df / SN_MOVE, 0);
/* touchscreen emulation */
input_set_abs_params(hi->input, ABS_Y,
f1, f2, df / SN_MOVE, 0);
return 1;
}
return 0;
case HID_UP_DIGITIZER:
switch (usage->hid) {
/* we do not want to map these: no input-oriented meaning */
case 0x14:
case 0x23:
case HID_DG_INPUTMODE:
case HID_DG_DEVICEINDEX:
case HID_DG_CONTACTCOUNT:
case HID_DG_CONTACTMAX:
case HID_DG_INRANGE:
case HID_DG_CONFIDENCE:
return -1;
case HID_DG_TIPSWITCH:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_WIDTH:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MAJOR);
input_set_abs_params(hi->input, ABS_MT_TOUCH_MAJOR,
f1, f2, df / SN_WIDTH, 0);
return 1;
case HID_DG_HEIGHT:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TOUCH_MINOR);
input_set_abs_params(hi->input, ABS_MT_TOUCH_MINOR,
f1, f2, df / SN_WIDTH, 0);
input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
0, 1, 0, 0);
return 1;
case HID_DG_CONTACTID:
input_mt_init_slots(hi->input, MAX_SLOTS);
return 1;
}
/* let hid-input decide for the others */
return 0;
case 0xff000000:
/* we do not want to map these: no input-oriented meaning */
return -1;
}
return 0;
}
static int mmm_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
/* tell hid-input to skip setup of these event types */
if (usage->type == EV_KEY || usage->type == EV_ABS)
set_bit(usage->type, hi->input->evbit);
return -1;
}
/*
* this function is called when a whole packet has been received and processed,
* so that it can decide what to send to the input layer.
*/
static void mmm_filter_event(struct mmm_data *md, struct input_dev *input)
{
int i;
for (i = 0; i < MAX_SLOTS; ++i) {
struct mmm_finger *f = &md->f[i];
if (!f->valid) {
/* this finger is just placeholder data, ignore */
continue;
}
input_mt_slot(input, i);
input_mt_report_slot_state(input, MT_TOOL_FINGER, f->touch);
if (f->touch) {
/* this finger is on the screen */
int wide = (f->w > f->h);
/* divided by two to match visual scale of touch */
int major = max(f->w, f->h) >> 1;
int minor = min(f->w, f->h) >> 1;
input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);
input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);
input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
}
f->valid = 0;
}
input_mt_report_pointer_emulation(input, true);
input_sync(input);
}
/*
* this function is called upon all reports
* so that we can accumulate contact point information,
* and call input_mt_sync after each point.
*/
static int mmm_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct mmm_data *md = hid_get_drvdata(hid);
/*
* strangely, this function can be called before
* field->hidinput is initialized!
*/
if (hid->claimed & HID_CLAIMED_INPUT) {
struct input_dev *input = field->hidinput->input;
switch (usage->hid) {
case HID_DG_TIPSWITCH:
md->touch = value;
break;
case HID_DG_CONFIDENCE:
md->valid = value;
break;
case HID_DG_WIDTH:
if (md->valid)
md->f[md->curid].w = value;
break;
case HID_DG_HEIGHT:
if (md->valid)
md->f[md->curid].h = value;
break;
case HID_DG_CONTACTID:
value = clamp_val(value, 0, MAX_SLOTS - 1);
if (md->valid) {
md->curid = value;
md->f[value].touch = md->touch;
md->f[value].valid = 1;
md->nreal++;
}
break;
case HID_GD_X:
if (md->valid)
md->f[md->curid].x = value;
break;
case HID_GD_Y:
if (md->valid)
md->f[md->curid].y = value;
break;
case HID_DG_CONTACTCOUNT:
if (value)
md->nexp = value;
if (md->nreal >= md->nexp) {
mmm_filter_event(md, input);
md->nreal = 0;
}
break;
}
}
/* we have handled the hidinput part, now remains hiddev */
if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
hid->hiddev_hid_event(hid, field, usage, value);
return 1;
}
static int mmm_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
struct mmm_data *md;
hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
if (!md) {
dev_err(&hdev->dev, "cannot allocate 3M data\n");
return -ENOMEM;
}
hid_set_drvdata(hdev, md);
ret = hid_parse(hdev);
if (!ret)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret)
kfree(md);
return ret;
}
static void mmm_remove(struct hid_device *hdev)
{
hid_hw_stop(hdev);
kfree(hid_get_drvdata(hdev));
hid_set_drvdata(hdev, NULL);
}
static const struct hid_device_id mmm_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M1968) },
{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M2256) },
{ }
};
MODULE_DEVICE_TABLE(hid, mmm_devices);
static const struct hid_usage_id mmm_grabbed_usages[] = {
{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
};
static struct hid_driver mmm_driver = {
.name = "3m-pct",
.id_table = mmm_devices,
.probe = mmm_probe,
.remove = mmm_remove,
.input_mapping = mmm_input_mapping,
.input_mapped = mmm_input_mapped,
.usage_table = mmm_grabbed_usages,
.event = mmm_event,
};
static int __init mmm_init(void)
{
return hid_register_driver(&mmm_driver);
}
static void __exit mmm_exit(void)
{
hid_unregister_driver(&mmm_driver);
}
module_init(mmm_init);
module_exit(mmm_exit);