HID: add support for Stantum multitouch panel

Added support for the Stantum multitouch panel.

Signed-off-by: Stephane Chatty <chatty@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 283 insertions, 0 deletions

diff --git a/drivers/hid/hid-stantum.c b/drivers/hid/hid-stantum.c
new file mode 100644
index 000000000000..add965dab932
--- /dev/null
+++ b/drivers/hid/hid-stantum.c
@@ -0,0 +1,283 @@
+/*
+ *  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);
+