273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/*
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* HID driver for Cando dual-touch panels
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*
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* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
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*
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
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MODULE_DESCRIPTION("Cando dual-touch panel");
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MODULE_LICENSE("GPL");
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#include "hid-ids.h"
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struct cando_data {
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__u16 x, y;
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__u8 id;
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__s8 oldest; /* id of the oldest finger in previous frame */
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bool valid; /* valid finger data, or just placeholder? */
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bool first; /* is this the first finger in this frame? */
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__s8 firstid; /* id of the first finger in the frame */
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__u16 firstx, firsty; /* (x, y) of the first finger in the frame */
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};
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static int cando_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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switch (usage->hid & HID_USAGE_PAGE) {
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case HID_UP_GENDESK:
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switch (usage->hid) {
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case HID_GD_X:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_X);
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/* touchscreen emulation */
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input_set_abs_params(hi->input, ABS_X,
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field->logical_minimum,
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field->logical_maximum, 0, 0);
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return 1;
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case HID_GD_Y:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_Y);
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/* touchscreen emulation */
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input_set_abs_params(hi->input, ABS_Y,
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field->logical_minimum,
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field->logical_maximum, 0, 0);
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return 1;
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}
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return 0;
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case HID_UP_DIGITIZER:
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switch (usage->hid) {
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case HID_DG_TIPSWITCH:
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case HID_DG_CONTACTMAX:
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return -1;
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case HID_DG_INRANGE:
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/* touchscreen emulation */
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hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
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return 1;
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case HID_DG_CONTACTID:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_TRACKING_ID);
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return 1;
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}
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return 0;
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}
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return 0;
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}
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static int cando_input_mapped(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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if (usage->type == EV_KEY || usage->type == EV_ABS)
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clear_bit(usage->code, *bit);
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return 0;
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}
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/*
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* this function is called when a whole finger has been parsed,
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* so that it can decide what to send to the input layer.
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*/
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static void cando_filter_event(struct cando_data *td, struct input_dev *input)
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{
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td->first = !td->first; /* touchscreen emulation */
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if (!td->valid) {
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/*
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* touchscreen emulation: if this is the second finger and
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* the first was valid, the first was the oldest; if the
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* first was not valid and there was a valid finger in the
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* previous frame, this is a release.
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*/
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if (td->first) {
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td->firstid = -1;
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} else if (td->firstid >= 0) {
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input_event(input, EV_ABS, ABS_X, td->firstx);
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input_event(input, EV_ABS, ABS_Y, td->firsty);
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td->oldest = td->firstid;
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} else if (td->oldest >= 0) {
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input_event(input, EV_KEY, BTN_TOUCH, 0);
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td->oldest = -1;
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}
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return;
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}
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input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
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input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
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input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
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input_mt_sync(input);
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/*
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* touchscreen emulation: if there was no touching finger previously,
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* emit touch event
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*/
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if (td->oldest < 0) {
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input_event(input, EV_KEY, BTN_TOUCH, 1);
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td->oldest = td->id;
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}
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/*
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* touchscreen emulation: if this is the first finger, wait for the
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* second; the oldest is then the second if it was the oldest already
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* or if there was no first, the first otherwise.
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*/
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if (td->first) {
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td->firstx = td->x;
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td->firsty = td->y;
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td->firstid = td->id;
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} else {
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int x, y, oldest;
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if (td->id == td->oldest || td->firstid < 0) {
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x = td->x;
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y = td->y;
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oldest = td->id;
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} else {
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x = td->firstx;
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y = td->firsty;
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oldest = td->firstid;
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}
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input_event(input, EV_ABS, ABS_X, x);
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input_event(input, EV_ABS, ABS_Y, y);
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td->oldest = oldest;
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}
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}
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static int cando_event(struct hid_device *hid, struct hid_field *field,
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struct hid_usage *usage, __s32 value)
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{
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struct cando_data *td = hid_get_drvdata(hid);
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if (hid->claimed & HID_CLAIMED_INPUT) {
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struct input_dev *input = field->hidinput->input;
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switch (usage->hid) {
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case HID_DG_INRANGE:
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td->valid = value;
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break;
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case HID_DG_CONTACTID:
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td->id = value;
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break;
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case HID_GD_X:
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td->x = value;
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break;
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case HID_GD_Y:
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td->y = value;
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cando_filter_event(td, input);
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break;
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case HID_DG_TIPSWITCH:
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/* avoid interference from generic hidinput handling */
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break;
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default:
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/* fallback to the generic hidinput handling */
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return 0;
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}
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}
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/* we have handled the hidinput part, now remains hiddev */
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if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
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hid->hiddev_hid_event(hid, field, usage, value);
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return 1;
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}
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static int cando_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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struct cando_data *td;
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td = kmalloc(sizeof(struct cando_data), GFP_KERNEL);
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if (!td) {
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dev_err(&hdev->dev, "cannot allocate Cando Touch data\n");
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return -ENOMEM;
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}
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hid_set_drvdata(hdev, td);
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td->first = false;
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td->oldest = -1;
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td->valid = false;
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ret = hid_parse(hdev);
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if (!ret)
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret)
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kfree(td);
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return ret;
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}
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static void cando_remove(struct hid_device *hdev)
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{
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hid_hw_stop(hdev);
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kfree(hid_get_drvdata(hdev));
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hid_set_drvdata(hdev, NULL);
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}
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static const struct hid_device_id cando_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
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USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
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USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, cando_devices);
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static const struct hid_usage_id cando_grabbed_usages[] = {
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{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
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{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
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};
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static struct hid_driver cando_driver = {
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.name = "cando-touch",
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.id_table = cando_devices,
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.probe = cando_probe,
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.remove = cando_remove,
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.input_mapping = cando_input_mapping,
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.input_mapped = cando_input_mapped,
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.usage_table = cando_grabbed_usages,
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.event = cando_event,
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};
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static int __init cando_init(void)
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{
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return hid_register_driver(&cando_driver);
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}
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static void __exit cando_exit(void)
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{
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hid_unregister_driver(&cando_driver);
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}
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module_init(cando_init);
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module_exit(cando_exit);
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