280 строки
7.1 KiB
C
280 строки
7.1 KiB
C
/*
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* HID driver for eGalax dual-touch panels
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*
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* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
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* Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
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* Copyright (c) 2010 Canonical, Ltd.
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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/usb.h>
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#include <linux/input/mt.h>
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#include <linux/slab.h>
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#include "usbhid/usbhid.h"
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MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
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MODULE_DESCRIPTION("eGalax dual-touch panel");
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MODULE_LICENSE("GPL");
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#include "hid-ids.h"
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#define MAX_SLOTS 2
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/* estimated signal-to-noise ratios */
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#define SN_MOVE 4096
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#define SN_PRESSURE 32
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struct egalax_data {
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int valid;
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int slot;
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int touch;
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int x, y, z;
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};
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static void set_abs(struct input_dev *input, unsigned int code,
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struct hid_field *field, int snratio)
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{
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int fmin = field->logical_minimum;
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int fmax = field->logical_maximum;
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int fuzz = snratio ? (fmax - fmin) / snratio : 0;
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input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
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}
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static int egalax_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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struct input_dev *input = hi->input;
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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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field->logical_maximum = 32760;
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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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set_abs(input, ABS_MT_POSITION_X, field, SN_MOVE);
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/* touchscreen emulation */
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set_abs(input, ABS_X, field, SN_MOVE);
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return 1;
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case HID_GD_Y:
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field->logical_maximum = 32760;
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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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set_abs(input, ABS_MT_POSITION_Y, field, SN_MOVE);
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/* touchscreen emulation */
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set_abs(input, ABS_Y, field, SN_MOVE);
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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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/* touchscreen emulation */
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hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
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input_set_capability(input, EV_KEY, BTN_TOUCH);
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return 1;
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case HID_DG_INRANGE:
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case HID_DG_CONFIDENCE:
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case HID_DG_CONTACTCOUNT:
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case HID_DG_CONTACTMAX:
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return -1;
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case HID_DG_CONTACTID:
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input_mt_init_slots(input, MAX_SLOTS);
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return 1;
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case HID_DG_TIPPRESSURE:
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field->logical_minimum = 0;
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_PRESSURE);
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set_abs(input, ABS_MT_PRESSURE, field, SN_PRESSURE);
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/* touchscreen emulation */
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set_abs(input, ABS_PRESSURE, field, SN_PRESSURE);
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return 1;
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}
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return 0;
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}
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/* ignore others (from other reports we won't get anyway) */
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return -1;
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}
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static int egalax_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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/* tell hid-input to skip setup of these event types */
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if (usage->type == EV_KEY || usage->type == EV_ABS)
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set_bit(usage->type, hi->input->evbit);
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return -1;
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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 egalax_filter_event(struct egalax_data *td, struct input_dev *input)
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{
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input_mt_slot(input, td->slot);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, td->touch);
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if (td->touch) {
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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_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
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}
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input_mt_report_pointer_emulation(input, true);
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}
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static int egalax_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 egalax_data *td = hid_get_drvdata(hid);
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/* Note, eGalax has two product lines: the first is resistive and
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* uses a standard parallel multitouch protocol (product ID ==
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* 48xx). The second is capacitive and uses an unusual "serial"
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* protocol with a different message for each multitouch finger
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* (product ID == 72xx).
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*/
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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_CONFIDENCE:
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/* avoid interference from generic hidinput handling */
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break;
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case HID_DG_TIPSWITCH:
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td->touch = value;
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break;
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case HID_DG_TIPPRESSURE:
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td->z = value;
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break;
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case HID_DG_CONTACTID:
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td->slot = clamp_val(value, 0, MAX_SLOTS - 1);
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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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/* this is the last field in a finger */
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if (td->valid)
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egalax_filter_event(td, input);
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break;
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case HID_DG_CONTACTCOUNT:
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/* touch emulation: this is the last field in a frame */
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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 egalax_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 egalax_data *td;
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struct hid_report *report;
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td = kzalloc(sizeof(struct egalax_data), GFP_KERNEL);
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if (!td) {
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dev_err(&hdev->dev, "cannot allocate eGalax 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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ret = hid_parse(hdev);
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if (ret)
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goto end;
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret)
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goto end;
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report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5];
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if (report) {
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report->field[0]->value[0] = 2;
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usbhid_submit_report(hdev, report, USB_DIR_OUT);
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}
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end:
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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 egalax_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 egalax_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
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USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
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USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
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USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
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USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
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USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, egalax_devices);
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static const struct hid_usage_id egalax_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 egalax_driver = {
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.name = "egalax-touch",
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.id_table = egalax_devices,
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.probe = egalax_probe,
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.remove = egalax_remove,
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.input_mapping = egalax_input_mapping,
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.input_mapped = egalax_input_mapped,
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.usage_table = egalax_grabbed_usages,
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.event = egalax_event,
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};
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static int __init egalax_init(void)
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{
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return hid_register_driver(&egalax_driver);
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}
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static void __exit egalax_exit(void)
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{
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hid_unregister_driver(&egalax_driver);
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}
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module_init(egalax_init);
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module_exit(egalax_exit);
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