/*
- * HID driver for some ntrig "special" devices
+ * HID driver for N-Trig touchscreens
*
- * Copyright (c) 1999 Andreas Gal
- * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
- * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
- * Copyright (c) 2006-2007 Jiri Kosina
- * Copyright (c) 2007 Paul Walmsley
- * Copyright (c) 2008 Jiri Slaby
* Copyright (c) 2008 Rafi Rubin
+ * Copyright (c) 2009 Stephane Chatty
*
*/
#define nt_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
EV_KEY, (c))
+struct ntrig_data {
+ __s32 x, y, id, w, h;
+ char reading_a_point, found_contact_id;
+};
+
+/*
+ * this driver is aimed at two firmware versions in circulation:
+ * - dual pen/finger single touch
+ * - finger multitouch, pen not working
+ */
+
static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
- if ((usage->hid & HID_USAGE_PAGE) == HID_UP_DIGITIZER &&
- (usage->hid & 0xff) == 0x47) {
- nt_map_key_clear(BTN_TOOL_DOUBLETAP);
- return 1;
+ 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);
+ 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);
+ 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) {
+ /* we do not want to map these for now */
+ case HID_DG_INVERT: /* value is always 0 */
+ case HID_DG_ERASER: /* value is always 0 */
+ case HID_DG_CONTACTID: /* value is useless */
+ case HID_DG_BARRELSWITCH: /* doubtful */
+ case HID_DG_INPUTMODE:
+ case HID_DG_DEVICEINDEX:
+ case HID_DG_CONTACTCOUNT:
+ case HID_DG_CONTACTMAX:
+ return -1;
+
+ /* original mapping by Rafi Rubin */
+ case HID_DG_CONFIDENCE:
+ nt_map_key_clear(BTN_TOOL_DOUBLETAP);
+ return 1;
+
+ /* width/height mapped on TouchMajor/TouchMinor/Orientation */
+ 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,
+ 0, 1, 0, 0);
+ return 1;
+ }
+ return 0;
+
+ case 0xff000000:
+ /* we do not want to map these: no input-oriented meaning */
+ return -1;
}
+
return 0;
}
return 0;
}
+
+/*
+ * this function is called upon all reports
+ * so that we can filter contact point information,
+ * decide whether we are in multi or single touch mode
+ * and call input_mt_sync after each point if necessary
+ */
+static int ntrig_event (struct hid_device *hid, struct hid_field *field,
+ struct hid_usage *usage, __s32 value)
+{
+ struct input_dev *input = field->hidinput->input;
+ struct ntrig_data *nd = hid_get_drvdata(hid);
+
+ if (hid->claimed & HID_CLAIMED_INPUT) {
+ switch (usage->hid) {
+ case HID_GD_X:
+ nd->x = value;
+ nd->reading_a_point = 1;
+ break;
+ case HID_GD_Y:
+ nd->y = value;
+ break;
+ case HID_DG_CONTACTID:
+ nd->id = value;
+ /* we receive this only when in multitouch mode */
+ nd->found_contact_id = 1;
+ break;
+ case HID_DG_WIDTH:
+ nd->w = value;
+ break;
+ case HID_DG_HEIGHT:
+ nd->h = value;
+ /*
+ * when in single touch mode, this is the last
+ * report received in a finger event. We want
+ * to emit a normal (X, Y) position
+ */
+ if (! nd->found_contact_id) {
+ input_event(input, EV_ABS, ABS_X, nd->x);
+ input_event(input, EV_ABS, ABS_Y, nd->y);
+ }
+ break;
+ case HID_DG_TIPPRESSURE:
+ /*
+ * when in single touch mode, this is the last
+ * report received in a pen event. We want
+ * to emit a normal (X, Y) position
+ */
+ if (! nd->found_contact_id) {
+ input_event(input, EV_ABS, ABS_X, nd->x);
+ input_event(input, EV_ABS, ABS_Y, nd->y);
+ input_event(input, EV_ABS, ABS_PRESSURE, value);
+ }
+ break;
+ case 0xff000002:
+ /*
+ * we receive this when the device is in multitouch
+ * mode. The first of the three values tagged with
+ * this usage tells if the contact point is real
+ * or a placeholder
+ */
+ if (!nd->reading_a_point || value != 1)
+ break;
+ /* emit a normal (X, Y) for the first point only */
+ if (nd->id == 0) {
+ input_event(input, EV_ABS, ABS_X, nd->x);
+ input_event(input, EV_ABS, ABS_Y, nd->y);
+ }
+ input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
+ input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
+ if (nd->w > nd->h) {
+ input_event(input, EV_ABS,
+ ABS_MT_ORIENTATION, 1);
+ input_event(input, EV_ABS,
+ ABS_MT_TOUCH_MAJOR, nd->w);
+ input_event(input, EV_ABS,
+ ABS_MT_TOUCH_MINOR, nd->h);
+ } else {
+ input_event(input, EV_ABS,
+ ABS_MT_ORIENTATION, 0);
+ input_event(input, EV_ABS,
+ ABS_MT_TOUCH_MAJOR, nd->h);
+ input_event(input, EV_ABS,
+ ABS_MT_TOUCH_MINOR, nd->w);
+ }
+ input_mt_sync(field->hidinput->input);
+ nd->reading_a_point = 0;
+ nd->found_contact_id = 0;
+ break;
+
+ default:
+ /* fallback to the generic hidinput handling */
+ return 0;
+ }
+ }
+
+ /* 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 ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ int ret;
+ struct ntrig_data *nd;
+
+ nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
+ if (!nd) {
+ dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
+ return -ENOMEM;
+ }
+ nd->reading_a_point = 0;
+ nd->found_contact_id = 0;
+ hid_set_drvdata(hdev, nd);
+
+ ret = hid_parse(hdev);
+ if (!ret)
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+
+ if (ret)
+ kfree (nd);
+ return ret;
+}
+
+static void ntrig_remove(struct hid_device *hdev)
+{
+ hid_hw_stop(hdev);
+ kfree(hid_get_drvdata(hdev));
+}
+
static const struct hid_device_id ntrig_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
.driver_data = NTRIG_DUPLICATE_USAGES },
};
MODULE_DEVICE_TABLE(hid, ntrig_devices);
+static const struct hid_usage_id ntrig_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 ntrig_driver = {
.name = "ntrig",
.id_table = ntrig_devices,
+ .probe = ntrig_probe,
+ .remove = ntrig_remove,
.input_mapping = ntrig_input_mapping,
.input_mapped = ntrig_input_mapped,
+ .usage_table = ntrig_grabbed_usages,
+ .event = ntrig_event,
};
static int ntrig_init(void)
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff