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@@ -0,0 +1,516 @@
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+/*
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+ * HID driver for multitouch panels
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+ *
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+ * Copyright (c) 2010-2011 Stephane Chatty <chatty@enac.fr>
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+ * Copyright (c) 2010-2011 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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+ * Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France
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+ *
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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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+
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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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+#include <linux/usb.h>
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+#include <linux/input/mt.h>
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+#include "usbhid/usbhid.h"
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+
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+
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+MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
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+MODULE_DESCRIPTION("HID multitouch panels");
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+MODULE_LICENSE("GPL");
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+
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+#include "hid-ids.h"
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+
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+/* quirks to control the device */
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+#define MT_QUIRK_NOT_SEEN_MEANS_UP (1 << 0)
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+#define MT_QUIRK_SLOT_IS_CONTACTID (1 << 1)
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+#define MT_QUIRK_CYPRESS (1 << 2)
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+#define MT_QUIRK_SLOT_IS_CONTACTNUMBER (1 << 3)
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+#define MT_QUIRK_VALID_IS_INRANGE (1 << 4)
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+#define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 5)
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+
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+struct mt_slot {
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+ __s32 x, y, p, w, h;
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+ __s32 contactid; /* the device ContactID assigned to this slot */
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+ bool touch_state; /* is the touch valid? */
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+ bool seen_in_this_frame;/* has this slot been updated */
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+};
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+
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+struct mt_device {
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+ struct mt_slot curdata; /* placeholder of incoming data */
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+ struct mt_class *mtclass; /* our mt device class */
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+ unsigned last_field_index; /* last field index of the report */
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+ unsigned last_slot_field; /* the last field of a slot */
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+ __s8 inputmode; /* InputMode HID feature, -1 if non-existent */
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+ __u8 num_received; /* how many contacts we received */
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+ __u8 num_expected; /* expected last contact index */
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+ bool curvalid; /* is the current contact valid? */
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+ struct mt_slot slots[0]; /* first slot */
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+};
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+
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+struct mt_class {
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+ __s32 name; /* MT_CLS */
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+ __s32 quirks;
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+ __s32 sn_move; /* Signal/noise ratio for move events */
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+ __s32 sn_pressure; /* Signal/noise ratio for pressure events */
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+ __u8 maxcontacts;
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+};
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+
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+/* classes of device behavior */
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+#define MT_CLS_DEFAULT 1
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+#define MT_CLS_DUAL1 2
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+#define MT_CLS_DUAL2 3
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+#define MT_CLS_CYPRESS 4
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+
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+/*
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+ * these device-dependent functions determine what slot corresponds
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+ * to a valid contact that was just read.
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+ */
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+
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+static int cypress_compute_slot(struct mt_device *td)
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+{
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+ if (td->curdata.contactid != 0 || td->num_received == 0)
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+ return td->curdata.contactid;
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+ else
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+ return -1;
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+}
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+
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+static int find_slot_from_contactid(struct mt_device *td)
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+{
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+ int i;
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+ for (i = 0; i < td->mtclass->maxcontacts; ++i) {
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+ if (td->slots[i].contactid == td->curdata.contactid &&
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+ td->slots[i].touch_state)
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+ return i;
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+ }
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+ for (i = 0; i < td->mtclass->maxcontacts; ++i) {
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+ if (!td->slots[i].seen_in_this_frame &&
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+ !td->slots[i].touch_state)
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+ return i;
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+ }
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+ /* should not occurs. If this happens that means
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+ * that the device sent more touches that it says
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+ * in the report descriptor. It is ignored then. */
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+ return -1;
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+}
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+
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+struct mt_class mt_classes[] = {
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+ { .name = MT_CLS_DEFAULT,
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+ .quirks = MT_QUIRK_VALID_IS_INRANGE,
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+ .maxcontacts = 10 },
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+ { .name = MT_CLS_DUAL1,
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+ .quirks = MT_QUIRK_VALID_IS_INRANGE |
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+ MT_QUIRK_SLOT_IS_CONTACTID,
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+ .maxcontacts = 2 },
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+ { .name = MT_CLS_DUAL2,
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+ .quirks = MT_QUIRK_VALID_IS_INRANGE |
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+ MT_QUIRK_SLOT_IS_CONTACTNUMBER,
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+ .maxcontacts = 2 },
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+ { .name = MT_CLS_CYPRESS,
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+ .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
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+ MT_QUIRK_CYPRESS,
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+ .maxcontacts = 10 },
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+
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+ { }
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+};
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+
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+static void mt_feature_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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+{
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+ if (usage->hid == HID_DG_INPUTMODE) {
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+ struct mt_device *td = hid_get_drvdata(hdev);
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+ td->inputmode = field->report->id;
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+ }
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+}
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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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+
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+static int mt_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 mt_device *td = hid_get_drvdata(hdev);
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+ struct mt_class *cls = td->mtclass;
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+ switch (usage->hid & HID_USAGE_PAGE) {
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+
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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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+ set_abs(hi->input, ABS_MT_POSITION_X, field,
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+ cls->sn_move);
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+ /* touchscreen emulation */
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+ set_abs(hi->input, ABS_X, field, cls->sn_move);
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+ td->last_slot_field = usage->hid;
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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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+ set_abs(hi->input, ABS_MT_POSITION_Y, field,
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+ cls->sn_move);
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+ /* touchscreen emulation */
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+ set_abs(hi->input, ABS_Y, field, cls->sn_move);
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ }
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+ return 0;
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+
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+ case HID_UP_DIGITIZER:
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+ switch (usage->hid) {
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+ case HID_DG_INRANGE:
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_CONFIDENCE:
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_TIPSWITCH:
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+ hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
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+ input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_CONTACTID:
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+ input_mt_init_slots(hi->input,
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+ td->mtclass->maxcontacts);
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_WIDTH:
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+ hid_map_usage(hi, usage, bit, max,
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+ EV_ABS, ABS_MT_TOUCH_MAJOR);
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_HEIGHT:
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+ hid_map_usage(hi, usage, bit, max,
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+ EV_ABS, ABS_MT_TOUCH_MINOR);
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+ field->logical_maximum = 1;
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+ field->logical_minimum = 0;
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+ set_abs(hi->input, ABS_MT_ORIENTATION, field, 0);
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_TIPPRESSURE:
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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(hi->input, ABS_MT_PRESSURE, field,
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+ cls->sn_pressure);
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+ /* touchscreen emulation */
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+ set_abs(hi->input, ABS_PRESSURE, field,
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+ cls->sn_pressure);
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+ td->last_slot_field = usage->hid;
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+ return 1;
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+ case HID_DG_CONTACTCOUNT:
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+ td->last_field_index = field->report->maxfield - 1;
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+ return 1;
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+ case HID_DG_CONTACTMAX:
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+ /* we don't set td->last_slot_field as contactcount and
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+ * contact max are global to the report */
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+ return -1;
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+ }
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+ /* let hid-input decide for the others */
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+ return 0;
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+
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+ case 0xff000000:
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+ /* we do not want to map these: no input-oriented meaning */
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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+static int mt_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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+ set_bit(usage->type, hi->input->evbit);
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+
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+ return -1;
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+}
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+
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+static int mt_compute_slot(struct mt_device *td)
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+{
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+ __s32 quirks = td->mtclass->quirks;
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+
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+ if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
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+ return td->curdata.contactid;
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+
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+ if (quirks & MT_QUIRK_CYPRESS)
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+ return cypress_compute_slot(td);
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+
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+ if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
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+ return td->num_received;
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+
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+ return find_slot_from_contactid(td);
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+}
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+
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+/*
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+ * this function is called when a whole contact has been processed,
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+ * so that it can assign it to a slot and store the data there
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+ */
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+static void mt_complete_slot(struct mt_device *td)
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+{
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+ td->curdata.seen_in_this_frame = true;
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+ if (td->curvalid) {
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+ int slotnum = mt_compute_slot(td);
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+
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+ if (slotnum >= 0 && slotnum < td->mtclass->maxcontacts)
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+ td->slots[slotnum] = td->curdata;
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+ }
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+ td->num_received++;
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+}
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+
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+
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+/*
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+ * this function is called when a whole packet has been received and processed,
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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 mt_emit_event(struct mt_device *td, struct input_dev *input)
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+{
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+ int i;
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+
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+ for (i = 0; i < td->mtclass->maxcontacts; ++i) {
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+ struct mt_slot *s = &(td->slots[i]);
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+ if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
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+ !s->seen_in_this_frame) {
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+ s->touch_state = false;
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+ }
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+
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+ input_mt_slot(input, i);
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+ input_mt_report_slot_state(input, MT_TOOL_FINGER,
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+ s->touch_state);
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+ if (s->touch_state) {
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+ input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
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+ input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
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+ input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
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+ input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w);
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+ input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
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+ }
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+ s->seen_in_this_frame = false;
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+
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+ }
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+
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+ input_mt_report_pointer_emulation(input, true);
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+ input_sync(input);
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+ td->num_received = 0;
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+}
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+
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+
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+
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+static int mt_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 mt_device *td = hid_get_drvdata(hid);
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+ __s32 quirks = td->mtclass->quirks;
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+
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+ if (hid->claimed & HID_CLAIMED_INPUT) {
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+ switch (usage->hid) {
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+ case HID_DG_INRANGE:
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+ if (quirks & MT_QUIRK_VALID_IS_INRANGE)
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+ td->curvalid = value;
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+ break;
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+ case HID_DG_TIPSWITCH:
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+ if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
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+ td->curvalid = value;
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+ td->curdata.touch_state = value;
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+ break;
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+ case HID_DG_CONFIDENCE:
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+ if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
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+ td->curvalid = value;
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+ break;
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+ case HID_DG_CONTACTID:
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+ td->curdata.contactid = value;
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+ break;
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+ case HID_DG_TIPPRESSURE:
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+ td->curdata.p = value;
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+ break;
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+ case HID_GD_X:
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+ td->curdata.x = value;
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+ break;
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+ case HID_GD_Y:
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+ td->curdata.y = value;
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+ break;
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+ case HID_DG_WIDTH:
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+ td->curdata.w = value;
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+ break;
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+ case HID_DG_HEIGHT:
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+ td->curdata.h = value;
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+ break;
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+ case HID_DG_CONTACTCOUNT:
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+ /*
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+ * Includes multi-packet support where subsequent
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+ * packets are sent with zero contactcount.
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+ */
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+ if (value)
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+ td->num_expected = value;
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+ break;
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+
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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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+ if (usage->hid == td->last_slot_field)
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+ mt_complete_slot(td);
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+
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+ if (field->index == td->last_field_index
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+ && td->num_received >= td->num_expected)
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+ mt_emit_event(td, field->hidinput->input);
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+
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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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+
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+ return 1;
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+}
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+
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+static void mt_set_input_mode(struct hid_device *hdev)
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+{
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+ struct mt_device *td = hid_get_drvdata(hdev);
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+ struct hid_report *r;
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+ struct hid_report_enum *re;
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+
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+ if (td->inputmode < 0)
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+ return;
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+
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|
|
+ re = &(hdev->report_enum[HID_FEATURE_REPORT]);
|
|
|
+ r = re->report_id_hash[td->inputmode];
|
|
|
+ if (r) {
|
|
|
+ r->field[0]->value[0] = 0x02;
|
|
|
+ usbhid_submit_report(hdev, r, USB_DIR_OUT);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
|
|
|
+{
|
|
|
+ int ret, i;
|
|
|
+ struct mt_device *td;
|
|
|
+ struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
|
|
|
+
|
|
|
+ for (i = 0; mt_classes[i].name ; i++) {
|
|
|
+ if (id->driver_data == mt_classes[i].name) {
|
|
|
+ mtclass = &(mt_classes[i]);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* This allows the driver to correctly support devices
|
|
|
+ * that emit events over several HID messages.
|
|
|
+ */
|
|
|
+ hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
|
|
|
+
|
|
|
+ td = kzalloc(sizeof(struct mt_device) +
|
|
|
+ mtclass->maxcontacts * sizeof(struct mt_slot),
|
|
|
+ GFP_KERNEL);
|
|
|
+ if (!td) {
|
|
|
+ dev_err(&hdev->dev, "cannot allocate multitouch data\n");
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+ td->mtclass = mtclass;
|
|
|
+ td->inputmode = -1;
|
|
|
+ hid_set_drvdata(hdev, td);
|
|
|
+
|
|
|
+ ret = hid_parse(hdev);
|
|
|
+ if (ret != 0)
|
|
|
+ goto fail;
|
|
|
+
|
|
|
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
|
|
|
+ if (ret)
|
|
|
+ goto fail;
|
|
|
+
|
|
|
+ mt_set_input_mode(hdev);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+fail:
|
|
|
+ kfree(td);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_PM
|
|
|
+static int mt_reset_resume(struct hid_device *hdev)
|
|
|
+{
|
|
|
+ mt_set_input_mode(hdev);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+static void mt_remove(struct hid_device *hdev)
|
|
|
+{
|
|
|
+ struct mt_device *td = hid_get_drvdata(hdev);
|
|
|
+ hid_hw_stop(hdev);
|
|
|
+ kfree(td);
|
|
|
+ hid_set_drvdata(hdev, NULL);
|
|
|
+}
|
|
|
+
|
|
|
+static const struct hid_device_id mt_devices[] = {
|
|
|
+
|
|
|
+ /* Cypress panel */
|
|
|
+ { .driver_data = MT_CLS_CYPRESS,
|
|
|
+ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
|
|
|
+ USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
|
|
|
+
|
|
|
+ /* GeneralTouch panel */
|
|
|
+ { .driver_data = MT_CLS_DUAL2,
|
|
|
+ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
|
|
|
+ USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
|
|
|
+
|
|
|
+ /* PixCir-based panels */
|
|
|
+ { .driver_data = MT_CLS_DUAL1,
|
|
|
+ HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
|
|
|
+ USB_DEVICE_ID_HANVON_MULTITOUCH) },
|
|
|
+ { .driver_data = MT_CLS_DUAL1,
|
|
|
+ HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
|
|
|
+ USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
|
|
|
+
|
|
|
+ { }
|
|
|
+};
|
|
|
+MODULE_DEVICE_TABLE(hid, mt_devices);
|
|
|
+
|
|
|
+static const struct hid_usage_id mt_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 mt_driver = {
|
|
|
+ .name = "hid-multitouch",
|
|
|
+ .id_table = mt_devices,
|
|
|
+ .probe = mt_probe,
|
|
|
+ .remove = mt_remove,
|
|
|
+ .input_mapping = mt_input_mapping,
|
|
|
+ .input_mapped = mt_input_mapped,
|
|
|
+ .feature_mapping = mt_feature_mapping,
|
|
|
+ .usage_table = mt_grabbed_usages,
|
|
|
+ .event = mt_event,
|
|
|
+#ifdef CONFIG_PM
|
|
|
+ .reset_resume = mt_reset_resume,
|
|
|
+#endif
|
|
|
+};
|
|
|
+
|
|
|
+static int __init mt_init(void)
|
|
|
+{
|
|
|
+ return hid_register_driver(&mt_driver);
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit mt_exit(void)
|
|
|
+{
|
|
|
+ hid_unregister_driver(&mt_driver);
|
|
|
+}
|
|
|
+
|
|
|
+module_init(mt_init);
|
|
|
+module_exit(mt_exit);
|
Linus Torvalds