--- /dev/null
+/*
+ * HID driver for Stantum multitouch panels
+ *
+ * Copyright (c) 2009 Stephane Chatty <chatty@enac.fr>
+ *
+ */
+
+/*
+ * 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>
+
+MODULE_VERSION("0.6");
+MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
+MODULE_DESCRIPTION("Stantum HID multitouch panels");
+MODULE_LICENSE("GPL");
+
+#include "hid-ids.h"
+
+struct stantum_data {
+ __s32 x, y, z, w, h; /* x, y, pressure, width, height */
+ __u16 id; /* touch id */
+ bool valid; /* valid finger data, or just placeholder? */
+ bool first; /* first finger in the HID packet? */
+ bool activity; /* at least one active finger so far? */
+};
+
+static int stantum_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ switch (usage->hid & HID_USAGE_PAGE) {
+
+ case HID_UP_GENDESK:
+ switch (usage->hid) {
+ case HID_GD_X:
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_POSITION_X);
+ /* touchscreen emulation */
+ input_set_abs_params(hi->input, ABS_X,
+ field->logical_minimum,
+ field->logical_maximum, 0, 0);
+ return 1;
+ case HID_GD_Y:
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_POSITION_Y);
+ /* touchscreen emulation */
+ input_set_abs_params(hi->input, ABS_Y,
+ field->logical_minimum,
+ field->logical_maximum, 0, 0);
+ return 1;
+ }
+ return 0;
+
+ case HID_UP_DIGITIZER:
+ switch (usage->hid) {
+ case HID_DG_INRANGE:
+ case HID_DG_CONFIDENCE:
+ case HID_DG_INPUTMODE:
+ case HID_DG_DEVICEINDEX:
+ case HID_DG_CONTACTCOUNT:
+ case HID_DG_CONTACTMAX:
+ case HID_DG_TIPPRESSURE:
+ return -1;
+
+ case HID_DG_TIPSWITCH:
+ /* touchscreen emulation */
+ hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
+ return 1;
+
+ case HID_DG_WIDTH:
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_TOUCH_MAJOR);
+ 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_ORIENTATION,
+ 1, 1, 0, 0);
+ return 1;
+ case HID_DG_CONTACTID:
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_TRACKING_ID);
+ return 1;
+
+ }
+ return 0;
+
+ case 0xff000000:
+ /* no input-oriented meaning */
+ return -1;
+ }
+
+ return 0;
+}
+
+static int stantum_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ if (usage->type == EV_KEY || usage->type == EV_ABS)
+ clear_bit(usage->code, *bit);
+
+ return 0;
+}
+
+/*
+ * this function is called when a whole finger has been parsed,
+ * so that it can decide what to send to the input layer.
+ */
+static void stantum_filter_event(struct stantum_data *sd,
+ struct input_dev *input)
+{
+ bool wide;
+
+ if (!sd->valid) {
+ /*
+ * touchscreen emulation: if the first finger is not valid and
+ * there previously was finger activity, this is a release
+ */
+ if (sd->first && sd->activity) {
+ input_event(input, EV_KEY, BTN_TOUCH, 0);
+ sd->activity = false;
+ }
+ return;
+ }
+
+ input_event(input, EV_ABS, ABS_MT_TRACKING_ID, sd->id);
+ input_event(input, EV_ABS, ABS_MT_POSITION_X, sd->x);
+ input_event(input, EV_ABS, ABS_MT_POSITION_Y, sd->y);
+
+ wide = (sd->w > sd->h);
+ input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
+ input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, wide ? sd->w : sd->h);
+ input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, wide ? sd->h : sd->w);
+
+#if 0
+ /* MT_PRESSURE does not exist yet */
+ input_event(input, EV_ABS, ABS_MT_PRESSURE, sd->z);
+#endif
+
+ input_mt_sync(input);
+ sd->valid = false;
+ sd->first = false;
+
+ /* touchscreen emulation */
+ if (sd->first) {
+ if (!sd->activity) {
+ input_event(input, EV_KEY, BTN_TOUCH, 1);
+ sd->activity = true;
+ }
+ input_event(input, EV_ABS, ABS_X, sd->x);
+ input_event(input, EV_ABS, ABS_Y, sd->y);
+ }
+}
+
+
+static int stantum_event(struct hid_device *hid, struct hid_field *field,
+ struct hid_usage *usage, __s32 value)
+{
+ struct stantum_data *sd = hid_get_drvdata(hid);
+
+ if (hid->claimed & HID_CLAIMED_INPUT) {
+ struct input_dev *input = field->hidinput->input;
+
+ switch (usage->hid) {
+ case HID_DG_INRANGE:
+ /* this is the last field in a finger */
+ stantum_filter_event(sd, input);
+ break;
+ case HID_DG_WIDTH:
+ sd->w = value;
+ break;
+ case HID_DG_HEIGHT:
+ sd->h = value;
+ break;
+ case HID_GD_X:
+ sd->x = value;
+ break;
+ case HID_GD_Y:
+ sd->y = value;
+ break;
+ case HID_DG_TIPPRESSURE:
+ sd->z = value;
+ break;
+ case HID_DG_CONTACTID:
+ sd->id = value;
+ break;
+ case HID_DG_CONFIDENCE:
+ sd->valid = !!value;
+ break;
+ case 0xff000002:
+ /* this comes only before the first finger */
+ sd->first = true;
+ break;
+
+ default:
+ /* ignore the others */
+ return 1;
+ }
+ }
+
+ /* 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 stantum_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
+ int ret;
+ struct stantum_data *sd;
+
+ sd = kmalloc(sizeof(struct stantum_data), GFP_KERNEL);
+ if (!sd) {
+ dev_err(&hdev->dev, "cannot allocate Stantum data\n");
+ return -ENOMEM;
+ }
+ sd->valid = false;
+ sd->first = false;
+ sd->activity = false;
+ hid_set_drvdata(hdev, sd);
+
+ ret = hid_parse(hdev);
+ if (!ret)
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+
+ if (ret)
+ kfree(sd);
+
+ return ret;
+}
+
+static void stantum_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 stantum_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP) },
+ { }
+};
+MODULE_DEVICE_TABLE(hid, stantum_devices);
+
+static const struct hid_usage_id stantum_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 stantum_driver = {
+ .name = "stantum",
+ .id_table = stantum_devices,
+ .probe = stantum_probe,
+ .remove = stantum_remove,
+ .input_mapping = stantum_input_mapping,
+ .input_mapped = stantum_input_mapped,
+ .usage_table = stantum_grabbed_usages,
+ .event = stantum_event,
+};
+
+static int __init stantum_init(void)
+{
+ return hid_register_driver(&stantum_driver);
+}
+
+static void __exit stantum_exit(void)
+{
+ hid_unregister_driver(&stantum_driver);
+}
+
+module_init(stantum_init);
+module_exit(stantum_exit);
+
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff