/* * HID driver for multitouch panels * * Copyright (c) 2010-2011 Stephane Chatty * Copyright (c) 2010-2011 Benjamin Tissoires * Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France * * This code is partly based on hid-egalax.c: * * Copyright (c) 2010 Stephane Chatty * Copyright (c) 2010 Henrik Rydberg * Copyright (c) 2010 Canonical, Ltd. * */ /* * 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 #include #include #include #include #include #include "usbhid/usbhid.h" MODULE_AUTHOR("Stephane Chatty "); MODULE_AUTHOR("Benjamin Tissoires "); MODULE_DESCRIPTION("HID multitouch panels"); MODULE_LICENSE("GPL"); #include "hid-ids.h" /* quirks to control the device */ #define MT_QUIRK_NOT_SEEN_MEANS_UP (1 << 0) #define MT_QUIRK_SLOT_IS_CONTACTID (1 << 1) #define MT_QUIRK_CYPRESS (1 << 2) #define MT_QUIRK_SLOT_IS_CONTACTNUMBER (1 << 3) #define MT_QUIRK_VALID_IS_INRANGE (1 << 4) #define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 5) #define MT_QUIRK_EGALAX_XYZ_FIXUP (1 << 6) struct mt_slot { __s32 x, y, p, w, h; __s32 contactid; /* the device ContactID assigned to this slot */ bool touch_state; /* is the touch valid? */ bool seen_in_this_frame;/* has this slot been updated */ }; struct mt_device { struct mt_slot curdata; /* placeholder of incoming data */ struct mt_class *mtclass; /* our mt device class */ unsigned last_field_index; /* last field index of the report */ unsigned last_slot_field; /* the last field of a slot */ __s8 inputmode; /* InputMode HID feature, -1 if non-existent */ __u8 num_received; /* how many contacts we received */ __u8 num_expected; /* expected last contact index */ __u8 maxcontacts; bool curvalid; /* is the current contact valid? */ struct mt_slot *slots; }; struct mt_class { __s32 name; /* MT_CLS */ __s32 quirks; __s32 sn_move; /* Signal/noise ratio for move events */ __s32 sn_pressure; /* Signal/noise ratio for pressure events */ __u8 maxcontacts; }; /* classes of device behavior */ #define MT_CLS_DEFAULT 1 #define MT_CLS_DUAL_INRANGE_CONTACTID 2 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER 3 #define MT_CLS_CYPRESS 4 #define MT_CLS_EGALAX 5 #define MT_CLS_STANTUM 6 #define MT_DEFAULT_MAXCONTACT 10 /* * these device-dependent functions determine what slot corresponds * to a valid contact that was just read. */ static int cypress_compute_slot(struct mt_device *td) { if (td->curdata.contactid != 0 || td->num_received == 0) return td->curdata.contactid; else return -1; } static int find_slot_from_contactid(struct mt_device *td) { int i; for (i = 0; i < td->maxcontacts; ++i) { if (td->slots[i].contactid == td->curdata.contactid && td->slots[i].touch_state) return i; } for (i = 0; i < td->maxcontacts; ++i) { if (!td->slots[i].seen_in_this_frame && !td->slots[i].touch_state) return i; } /* should not occurs. If this happens that means * that the device sent more touches that it says * in the report descriptor. It is ignored then. */ return -1; } struct mt_class mt_classes[] = { { .name = MT_CLS_DEFAULT, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP }, { .name = MT_CLS_DUAL_INRANGE_CONTACTID, .quirks = MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_SLOT_IS_CONTACTID, .maxcontacts = 2 }, { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER, .quirks = MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_SLOT_IS_CONTACTNUMBER, .maxcontacts = 2 }, { .name = MT_CLS_CYPRESS, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP | MT_QUIRK_CYPRESS, .maxcontacts = 10 }, { .name = MT_CLS_EGALAX, .quirks = MT_QUIRK_SLOT_IS_CONTACTID | MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_EGALAX_XYZ_FIXUP, .maxcontacts = 2, .sn_move = 4096, .sn_pressure = 32, }, { .name = MT_CLS_STANTUM, .quirks = MT_QUIRK_VALID_IS_CONFIDENCE }, { } }; static void mt_feature_mapping(struct hid_device *hdev, struct hid_field *field, struct hid_usage *usage) { struct mt_device *td = hid_get_drvdata(hdev); switch (usage->hid) { case HID_DG_INPUTMODE: td->inputmode = field->report->id; break; case HID_DG_CONTACTMAX: td->maxcontacts = field->value[0]; if (td->mtclass->maxcontacts) /* check if the maxcontacts is given by the class */ td->maxcontacts = td->mtclass->maxcontacts; break; } } static void set_abs(struct input_dev *input, unsigned int code, struct hid_field *field, int snratio) { int fmin = field->logical_minimum; int fmax = field->logical_maximum; int fuzz = snratio ? (fmax - fmin) / snratio : 0; input_set_abs_params(input, code, fmin, fmax, fuzz, 0); } static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max) { struct mt_device *td = hid_get_drvdata(hdev); struct mt_class *cls = td->mtclass; __s32 quirks = cls->quirks; switch (usage->hid & HID_USAGE_PAGE) { case HID_UP_GENDESK: switch (usage->hid) { case HID_GD_X: if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP) field->logical_maximum = 32760; hid_map_usage(hi, usage, bit, max, EV_ABS, ABS_MT_POSITION_X); set_abs(hi->input, ABS_MT_POSITION_X, field, cls->sn_move); /* touchscreen emulation */ set_abs(hi->input, ABS_X, field, cls->sn_move); td->last_slot_field = usage->hid; return 1; case HID_GD_Y: if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP) field->logical_maximum = 32760; hid_map_usage(hi, usage, bit, max, EV_ABS, ABS_MT_POSITION_Y); set_abs(hi->input, ABS_MT_POSITION_Y, field, cls->sn_move); /* touchscreen emulation */ set_abs(hi->input, ABS_Y, field, cls->sn_move); td->last_slot_field = usage->hid; return 1; } return 0; case HID_UP_DIGITIZER: switch (usage->hid) { case HID_DG_INRANGE: td->last_slot_field = usage->hid; return 1; case HID_DG_CONFIDENCE: td->last_slot_field = usage->hid; return 1; case HID_DG_TIPSWITCH: hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH); input_set_capability(hi->input, EV_KEY, BTN_TOUCH); td->last_slot_field = usage->hid; return 1; case HID_DG_CONTACTID: input_mt_init_slots(hi->input, td->maxcontacts); td->last_slot_field = usage->hid; return 1; case HID_DG_WIDTH: hid_map_usage(hi, usage, bit, max, EV_ABS, ABS_MT_TOUCH_MAJOR); td->last_slot_field = usage->hid; return 1; case HID_DG_HEIGHT: hid_map_usage(hi, usage, bit, max, EV_ABS, ABS_MT_TOUCH_MINOR); field->logical_maximum = 1; field->logical_minimum = 0; set_abs(hi->input, ABS_MT_ORIENTATION, field, 0); td->last_slot_field = usage->hid; return 1; case HID_DG_TIPPRESSURE: if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP) field->logical_minimum = 0; hid_map_usage(hi, usage, bit, max, EV_ABS, ABS_MT_PRESSURE); set_abs(hi->input, ABS_MT_PRESSURE, field, cls->sn_pressure); /* touchscreen emulation */ set_abs(hi->input, ABS_PRESSURE, field, cls->sn_pressure); td->last_slot_field = usage->hid; return 1; case HID_DG_CONTACTCOUNT: td->last_field_index = field->report->maxfield - 1; return 1; case HID_DG_CONTACTMAX: /* we don't set td->last_slot_field as contactcount and * contact max are global to the report */ return -1; } /* let hid-input decide for the others */ return 0; case 0xff000000: /* we do not want to map these: no input-oriented meaning */ return -1; } return 0; } static int mt_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) set_bit(usage->type, hi->input->evbit); return -1; } static int mt_compute_slot(struct mt_device *td) { __s32 quirks = td->mtclass->quirks; if (quirks & MT_QUIRK_SLOT_IS_CONTACTID) return td->curdata.contactid; if (quirks & MT_QUIRK_CYPRESS) return cypress_compute_slot(td); if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER) return td->num_received; return find_slot_from_contactid(td); } /* * this function is called when a whole contact has been processed, * so that it can assign it to a slot and store the data there */ static void mt_complete_slot(struct mt_device *td) { td->curdata.seen_in_this_frame = true; if (td->curvalid) { int slotnum = mt_compute_slot(td); if (slotnum >= 0 && slotnum < td->maxcontacts) td->slots[slotnum] = td->curdata; } td->num_received++; } /* * this function is called when a whole packet has been received and processed, * so that it can decide what to send to the input layer. */ static void mt_emit_event(struct mt_device *td, struct input_dev *input) { int i; for (i = 0; i < td->maxcontacts; ++i) { struct mt_slot *s = &(td->slots[i]); if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) && !s->seen_in_this_frame) { s->touch_state = false; } input_mt_slot(input, i); input_mt_report_slot_state(input, MT_TOOL_FINGER, s->touch_state); if (s->touch_state) { input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x); input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y); input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p); input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w); input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h); } s->seen_in_this_frame = false; } input_mt_report_pointer_emulation(input, true); input_sync(input); td->num_received = 0; } static int mt_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value) { struct mt_device *td = hid_get_drvdata(hid); __s32 quirks = td->mtclass->quirks; if (hid->claimed & HID_CLAIMED_INPUT && td->slots) { switch (usage->hid) { case HID_DG_INRANGE: if (quirks & MT_QUIRK_VALID_IS_INRANGE) td->curvalid = value; break; case HID_DG_TIPSWITCH: if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) td->curvalid = value; td->curdata.touch_state = value; break; case HID_DG_CONFIDENCE: if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE) td->curvalid = value; break; case HID_DG_CONTACTID: td->curdata.contactid = value; break; case HID_DG_TIPPRESSURE: td->curdata.p = value; break; case HID_GD_X: td->curdata.x = value; break; case HID_GD_Y: td->curdata.y = value; break; case HID_DG_WIDTH: td->curdata.w = value; break; case HID_DG_HEIGHT: td->curdata.h = value; break; case HID_DG_CONTACTCOUNT: /* * Includes multi-packet support where subsequent * packets are sent with zero contactcount. */ if (value) td->num_expected = value; break; default: /* fallback to the generic hidinput handling */ return 0; } if (usage->hid == td->last_slot_field) { mt_complete_slot(td); if (!td->last_field_index) mt_emit_event(td, field->hidinput->input); } if (field->index == td->last_field_index && td->num_received >= td->num_expected) mt_emit_event(td, field->hidinput->input); } /* 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 void mt_set_input_mode(struct hid_device *hdev) { struct mt_device *td = hid_get_drvdata(hdev); struct hid_report *r; struct hid_report_enum *re; if (td->inputmode < 0) return; 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), 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; if (!td->maxcontacts) td->maxcontacts = MT_DEFAULT_MAXCONTACT; td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot), GFP_KERNEL); if (!td->slots) { dev_err(&hdev->dev, "cannot allocate multitouch slots\n"); hid_hw_stop(hdev); ret = -ENOMEM; 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->slots); kfree(td); hid_set_drvdata(hdev, NULL); } static const struct hid_device_id mt_devices[] = { /* Cando panels */ { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER, HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH) }, { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER, HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH_10_1) }, { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER, HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) }, { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER, HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) }, /* 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_DUAL_INRANGE_CONTACTNUMBER, HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) }, /* IRTOUCH panels */ { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID, HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS, USB_DEVICE_ID_IRTOUCH_INFRARED_USB) }, /* PixCir-based panels */ { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID, HID_USB_DEVICE(USB_VENDOR_ID_HANVON, USB_DEVICE_ID_HANVON_MULTITOUCH) }, { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID, HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) }, /* Resistive eGalax devices */ { .driver_data = MT_CLS_EGALAX, HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) }, { .driver_data = MT_CLS_EGALAX, HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) }, /* Capacitive eGalax devices */ { .driver_data = MT_CLS_EGALAX, HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) }, { .driver_data = MT_CLS_EGALAX, HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) }, { .driver_data = MT_CLS_EGALAX, HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) }, /* Stantum panels */ { .driver_data = MT_CLS_STANTUM, HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP)}, { .driver_data = MT_CLS_STANTUM, HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP_STM)}, { .driver_data = MT_CLS_STANTUM, HID_USB_DEVICE(USB_VENDOR_ID_STANTUM, USB_DEVICE_ID_MTP_SITRONIX)}, { } }; 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);