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617 lines
15 KiB
617 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Wacom protocol 4 serial tablet driver |
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* |
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* Copyright 2014 Hans de Goede <[email protected]> |
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* Copyright 2011-2012 Julian Squires <[email protected]> |
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* |
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* Many thanks to Bill Seremetis, without whom PenPartner support |
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* would not have been possible. Thanks to Patrick Mahoney. |
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* |
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* This driver was developed with reference to much code written by others, |
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* particularly: |
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* - elo, gunze drivers by Vojtech Pavlik <[email protected]>; |
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* - wacom_w8001 driver by Jaya Kumar <[email protected]>; |
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* - the USB wacom input driver, credited to many people |
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* (see drivers/input/tablet/wacom.h); |
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* - new and old versions of linuxwacom / xf86-input-wacom credited to |
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* Frederic Lepied, France. <[email protected]> and |
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* Ping Cheng, Wacom. <[email protected]>; |
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* - and xf86wacom.c (a presumably ancient version of the linuxwacom code), |
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* by Frederic Lepied and Raph Levien <[email protected]>. |
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* |
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* To do: |
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* - support pad buttons; (requires access to a model with pad buttons) |
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* - support (protocol 4-style) tilt (requires access to a > 1.4 rom model) |
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*/ |
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|
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/* |
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* Wacom serial protocol 4 documentation taken from linuxwacom-0.9.9 code, |
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* protocol 4 uses 7 or 9 byte of data in the following format: |
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* |
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* Byte 1 |
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* bit 7 Sync bit always 1 |
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* bit 6 Pointing device detected |
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* bit 5 Cursor = 0 / Stylus = 1 |
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* bit 4 Reserved |
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* bit 3 1 if a button on the pointing device has been pressed |
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* bit 2 P0 (optional) |
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* bit 1 X15 |
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* bit 0 X14 |
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* |
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* Byte 2 |
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* bit 7 Always 0 |
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* bits 6-0 = X13 - X7 |
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* |
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* Byte 3 |
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* bit 7 Always 0 |
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* bits 6-0 = X6 - X0 |
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* |
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* Byte 4 |
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* bit 7 Always 0 |
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* bit 6 B3 |
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* bit 5 B2 |
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* bit 4 B1 |
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* bit 3 B0 |
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* bit 2 P1 (optional) |
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* bit 1 Y15 |
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* bit 0 Y14 |
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* |
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* Byte 5 |
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* bit 7 Always 0 |
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* bits 6-0 = Y13 - Y7 |
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* |
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* Byte 6 |
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* bit 7 Always 0 |
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* bits 6-0 = Y6 - Y0 |
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* |
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* Byte 7 |
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* bit 7 Always 0 |
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* bit 6 Sign of pressure data; or wheel-rel for cursor tool |
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* bit 5 P7; or REL1 for cursor tool |
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* bit 4 P6; or REL0 for cursor tool |
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* bit 3 P5 |
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* bit 2 P4 |
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* bit 1 P3 |
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* bit 0 P2 |
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* |
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* byte 8 and 9 are optional and present only |
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* in tilt mode. |
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* |
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* Byte 8 |
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* bit 7 Always 0 |
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* bit 6 Sign of tilt X |
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* bit 5 Xt6 |
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* bit 4 Xt5 |
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* bit 3 Xt4 |
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* bit 2 Xt3 |
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* bit 1 Xt2 |
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* bit 0 Xt1 |
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* |
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* Byte 9 |
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* bit 7 Always 0 |
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* bit 6 Sign of tilt Y |
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* bit 5 Yt6 |
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* bit 4 Yt5 |
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* bit 3 Yt4 |
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* bit 2 Yt3 |
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* bit 1 Yt2 |
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* bit 0 Yt1 |
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*/ |
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#include <linux/completion.h> |
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#include <linux/init.h> |
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#include <linux/input.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/serio.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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MODULE_AUTHOR("Julian Squires <[email protected]>, Hans de Goede <[email protected]>"); |
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MODULE_DESCRIPTION("Wacom protocol 4 serial tablet driver"); |
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MODULE_LICENSE("GPL"); |
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#define REQUEST_MODEL_AND_ROM_VERSION "~#" |
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#define REQUEST_MAX_COORDINATES "~C\r" |
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#define REQUEST_CONFIGURATION_STRING "~R\r" |
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#define REQUEST_RESET_TO_PROTOCOL_IV "\r#" |
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/* |
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* Note: sending "\r$\r" causes at least the Digitizer II to send |
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* packets in ASCII instead of binary. "\r#" seems to undo that. |
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*/ |
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#define COMMAND_START_SENDING_PACKETS "ST\r" |
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#define COMMAND_STOP_SENDING_PACKETS "SP\r" |
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#define COMMAND_MULTI_MODE_INPUT "MU1\r" |
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#define COMMAND_ORIGIN_IN_UPPER_LEFT "OC1\r" |
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#define COMMAND_ENABLE_ALL_MACRO_BUTTONS "~M0\r" |
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#define COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS "~M1\r" |
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#define COMMAND_TRANSMIT_AT_MAX_RATE "IT0\r" |
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#define COMMAND_DISABLE_INCREMENTAL_MODE "IN0\r" |
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#define COMMAND_ENABLE_CONTINUOUS_MODE "SR\r" |
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#define COMMAND_ENABLE_PRESSURE_MODE "PH1\r" |
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#define COMMAND_Z_FILTER "ZF1\r" |
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|
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/* Note that this is a protocol 4 packet without tilt information. */ |
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#define PACKET_LENGTH 7 |
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#define DATA_SIZE 32 |
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/* flags */ |
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#define F_COVERS_SCREEN 0x01 |
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#define F_HAS_STYLUS2 0x02 |
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#define F_HAS_SCROLLWHEEL 0x04 |
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/* device IDs */ |
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#define STYLUS_DEVICE_ID 0x02 |
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#define CURSOR_DEVICE_ID 0x06 |
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#define ERASER_DEVICE_ID 0x0A |
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enum { STYLUS = 1, ERASER, CURSOR }; |
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|
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static const struct { |
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int device_id; |
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int input_id; |
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} tools[] = { |
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{ 0, 0 }, |
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{ STYLUS_DEVICE_ID, BTN_TOOL_PEN }, |
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{ ERASER_DEVICE_ID, BTN_TOOL_RUBBER }, |
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{ CURSOR_DEVICE_ID, BTN_TOOL_MOUSE }, |
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}; |
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struct wacom { |
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struct input_dev *dev; |
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struct completion cmd_done; |
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int result; |
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u8 expect; |
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u8 eraser_mask; |
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unsigned int extra_z_bits; |
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unsigned int flags; |
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unsigned int res_x, res_y; |
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unsigned int max_x, max_y; |
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unsigned int tool; |
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unsigned int idx; |
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u8 data[DATA_SIZE]; |
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char phys[32]; |
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}; |
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enum { |
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MODEL_CINTIQ = 0x504C, /* PL */ |
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MODEL_CINTIQ2 = 0x4454, /* DT */ |
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MODEL_DIGITIZER_II = 0x5544, /* UD */ |
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MODEL_GRAPHIRE = 0x4554, /* ET */ |
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MODEL_PENPARTNER = 0x4354, /* CT */ |
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MODEL_ARTPAD_II = 0x4B54, /* KT */ |
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}; |
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static void wacom_handle_model_response(struct wacom *wacom) |
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{ |
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int major_v, minor_v, r = 0; |
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char *p; |
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p = strrchr(wacom->data, 'V'); |
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if (p) |
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r = sscanf(p + 1, "%u.%u", &major_v, &minor_v); |
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if (r != 2) |
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major_v = minor_v = 0; |
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switch (wacom->data[2] << 8 | wacom->data[3]) { |
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case MODEL_CINTIQ: /* UNTESTED */ |
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case MODEL_CINTIQ2: |
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if ((wacom->data[2] << 8 | wacom->data[3]) == MODEL_CINTIQ) { |
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wacom->dev->name = "Wacom Cintiq"; |
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wacom->dev->id.version = MODEL_CINTIQ; |
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} else { |
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wacom->dev->name = "Wacom Cintiq II"; |
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wacom->dev->id.version = MODEL_CINTIQ2; |
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} |
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wacom->res_x = 508; |
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wacom->res_y = 508; |
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switch (wacom->data[5] << 8 | wacom->data[6]) { |
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case 0x3731: /* PL-710 */ |
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wacom->res_x = 2540; |
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wacom->res_y = 2540; |
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fallthrough; |
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case 0x3535: /* PL-550 */ |
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case 0x3830: /* PL-800 */ |
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wacom->extra_z_bits = 2; |
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} |
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wacom->flags = F_COVERS_SCREEN; |
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break; |
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case MODEL_PENPARTNER: |
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wacom->dev->name = "Wacom Penpartner"; |
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wacom->dev->id.version = MODEL_PENPARTNER; |
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wacom->res_x = 1000; |
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wacom->res_y = 1000; |
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break; |
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case MODEL_GRAPHIRE: |
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wacom->dev->name = "Wacom Graphire"; |
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wacom->dev->id.version = MODEL_GRAPHIRE; |
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wacom->res_x = 1016; |
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wacom->res_y = 1016; |
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wacom->max_x = 5103; |
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wacom->max_y = 3711; |
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wacom->extra_z_bits = 2; |
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wacom->eraser_mask = 0x08; |
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wacom->flags = F_HAS_STYLUS2 | F_HAS_SCROLLWHEEL; |
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break; |
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case MODEL_ARTPAD_II: |
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case MODEL_DIGITIZER_II: |
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wacom->dev->name = "Wacom Digitizer II"; |
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wacom->dev->id.version = MODEL_DIGITIZER_II; |
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if (major_v == 1 && minor_v <= 2) |
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wacom->extra_z_bits = 0; /* UNTESTED */ |
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break; |
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default: |
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dev_err(&wacom->dev->dev, "Unsupported Wacom model %s\n", |
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wacom->data); |
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wacom->result = -ENODEV; |
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return; |
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} |
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dev_info(&wacom->dev->dev, "%s tablet, version %u.%u\n", |
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wacom->dev->name, major_v, minor_v); |
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} |
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static void wacom_handle_configuration_response(struct wacom *wacom) |
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{ |
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int r, skip; |
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dev_dbg(&wacom->dev->dev, "Configuration string: %s\n", wacom->data); |
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r = sscanf(wacom->data, "~R%x,%u,%u,%u,%u", &skip, &skip, &skip, |
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&wacom->res_x, &wacom->res_y); |
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if (r != 5) |
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dev_warn(&wacom->dev->dev, "could not get resolution\n"); |
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} |
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static void wacom_handle_coordinates_response(struct wacom *wacom) |
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{ |
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int r; |
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dev_dbg(&wacom->dev->dev, "Coordinates string: %s\n", wacom->data); |
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r = sscanf(wacom->data, "~C%u,%u", &wacom->max_x, &wacom->max_y); |
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if (r != 2) |
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dev_warn(&wacom->dev->dev, "could not get max coordinates\n"); |
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} |
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static void wacom_handle_response(struct wacom *wacom) |
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{ |
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if (wacom->data[0] != '~' || wacom->data[1] != wacom->expect) { |
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dev_err(&wacom->dev->dev, |
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"Wacom got an unexpected response: %s\n", wacom->data); |
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wacom->result = -EIO; |
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} else { |
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wacom->result = 0; |
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switch (wacom->data[1]) { |
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case '#': |
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wacom_handle_model_response(wacom); |
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break; |
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case 'R': |
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wacom_handle_configuration_response(wacom); |
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break; |
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case 'C': |
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wacom_handle_coordinates_response(wacom); |
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break; |
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} |
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} |
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complete(&wacom->cmd_done); |
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} |
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static void wacom_handle_packet(struct wacom *wacom) |
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{ |
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u8 in_proximity_p, stylus_p, button; |
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unsigned int tool; |
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int x, y, z; |
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in_proximity_p = wacom->data[0] & 0x40; |
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stylus_p = wacom->data[0] & 0x20; |
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button = (wacom->data[3] & 0x78) >> 3; |
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x = (wacom->data[0] & 3) << 14 | wacom->data[1]<<7 | wacom->data[2]; |
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y = (wacom->data[3] & 3) << 14 | wacom->data[4]<<7 | wacom->data[5]; |
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if (in_proximity_p && stylus_p) { |
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z = wacom->data[6] & 0x7f; |
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if (wacom->extra_z_bits >= 1) |
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z = z << 1 | (wacom->data[3] & 0x4) >> 2; |
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if (wacom->extra_z_bits > 1) |
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z = z << 1 | (wacom->data[0] & 0x4) >> 2; |
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z = z ^ (0x40 << wacom->extra_z_bits); |
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} else { |
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z = -1; |
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} |
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if (stylus_p) |
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tool = (button & wacom->eraser_mask) ? ERASER : STYLUS; |
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else |
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tool = CURSOR; |
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if (tool != wacom->tool && wacom->tool != 0) { |
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input_report_key(wacom->dev, tools[wacom->tool].input_id, 0); |
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input_sync(wacom->dev); |
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} |
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wacom->tool = tool; |
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input_report_key(wacom->dev, tools[tool].input_id, in_proximity_p); |
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input_report_abs(wacom->dev, ABS_MISC, |
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in_proximity_p ? tools[tool].device_id : 0); |
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input_report_abs(wacom->dev, ABS_X, x); |
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input_report_abs(wacom->dev, ABS_Y, y); |
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input_report_abs(wacom->dev, ABS_PRESSURE, z); |
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if (stylus_p) { |
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input_report_key(wacom->dev, BTN_TOUCH, button & 1); |
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input_report_key(wacom->dev, BTN_STYLUS, button & 2); |
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input_report_key(wacom->dev, BTN_STYLUS2, button & 4); |
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} else { |
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input_report_key(wacom->dev, BTN_LEFT, button & 1); |
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input_report_key(wacom->dev, BTN_RIGHT, button & 2); |
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input_report_key(wacom->dev, BTN_MIDDLE, button & 4); |
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/* handle relative wheel for non-stylus device */ |
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z = (wacom->data[6] & 0x30) >> 4; |
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if (wacom->data[6] & 0x40) |
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z = -z; |
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input_report_rel(wacom->dev, REL_WHEEL, z); |
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} |
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input_sync(wacom->dev); |
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} |
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static void wacom_clear_data_buf(struct wacom *wacom) |
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{ |
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memset(wacom->data, 0, DATA_SIZE); |
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wacom->idx = 0; |
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} |
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static irqreturn_t wacom_interrupt(struct serio *serio, unsigned char data, |
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unsigned int flags) |
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{ |
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struct wacom *wacom = serio_get_drvdata(serio); |
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if (data & 0x80) |
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wacom->idx = 0; |
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/* |
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* We're either expecting a carriage return-terminated ASCII |
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* response string, or a seven-byte packet with the MSB set on |
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* the first byte. |
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* |
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* Note however that some tablets (the PenPartner, for |
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* example) don't send a carriage return at the end of a |
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* command. We handle these by waiting for timeout. |
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*/ |
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if (data == '\r' && !(wacom->data[0] & 0x80)) { |
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wacom_handle_response(wacom); |
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wacom_clear_data_buf(wacom); |
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return IRQ_HANDLED; |
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} |
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|
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/* Leave place for 0 termination */ |
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if (wacom->idx > (DATA_SIZE - 2)) { |
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dev_dbg(&wacom->dev->dev, |
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"throwing away %d bytes of garbage\n", wacom->idx); |
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wacom_clear_data_buf(wacom); |
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} |
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wacom->data[wacom->idx++] = data; |
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if (wacom->idx == PACKET_LENGTH && (wacom->data[0] & 0x80)) { |
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wacom_handle_packet(wacom); |
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wacom_clear_data_buf(wacom); |
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} |
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return IRQ_HANDLED; |
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} |
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static void wacom_disconnect(struct serio *serio) |
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{ |
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struct wacom *wacom = serio_get_drvdata(serio); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_unregister_device(wacom->dev); |
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kfree(wacom); |
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} |
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static int wacom_send(struct serio *serio, const u8 *command) |
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{ |
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int err = 0; |
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for (; !err && *command; command++) |
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err = serio_write(serio, *command); |
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return err; |
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} |
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static int wacom_send_setup_string(struct wacom *wacom, struct serio *serio) |
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{ |
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const u8 *cmd; |
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|
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switch (wacom->dev->id.version) { |
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case MODEL_CINTIQ: /* UNTESTED */ |
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cmd = COMMAND_ORIGIN_IN_UPPER_LEFT |
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COMMAND_TRANSMIT_AT_MAX_RATE |
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COMMAND_ENABLE_CONTINUOUS_MODE |
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COMMAND_START_SENDING_PACKETS; |
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break; |
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case MODEL_PENPARTNER: |
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cmd = COMMAND_ENABLE_PRESSURE_MODE |
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COMMAND_START_SENDING_PACKETS; |
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break; |
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default: |
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cmd = COMMAND_MULTI_MODE_INPUT |
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COMMAND_ORIGIN_IN_UPPER_LEFT |
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COMMAND_ENABLE_ALL_MACRO_BUTTONS |
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COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS |
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COMMAND_TRANSMIT_AT_MAX_RATE |
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COMMAND_DISABLE_INCREMENTAL_MODE |
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COMMAND_ENABLE_CONTINUOUS_MODE |
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COMMAND_Z_FILTER |
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COMMAND_START_SENDING_PACKETS; |
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break; |
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} |
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return wacom_send(serio, cmd); |
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} |
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static int wacom_send_and_wait(struct wacom *wacom, struct serio *serio, |
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const u8 *cmd, const char *desc) |
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{ |
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int err; |
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unsigned long u; |
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wacom->expect = cmd[1]; |
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init_completion(&wacom->cmd_done); |
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err = wacom_send(serio, cmd); |
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if (err) |
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return err; |
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u = wait_for_completion_timeout(&wacom->cmd_done, HZ); |
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if (u == 0) { |
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/* Timeout, process what we've received. */ |
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wacom_handle_response(wacom); |
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} |
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wacom->expect = 0; |
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return wacom->result; |
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} |
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static int wacom_setup(struct wacom *wacom, struct serio *serio) |
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{ |
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int err; |
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|
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/* Note that setting the link speed is the job of inputattach. |
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* We assume that reset negotiation has already happened, |
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* here. */ |
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err = wacom_send_and_wait(wacom, serio, REQUEST_MODEL_AND_ROM_VERSION, |
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"model and version"); |
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if (err) |
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return err; |
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if (!(wacom->res_x && wacom->res_y)) { |
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err = wacom_send_and_wait(wacom, serio, |
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REQUEST_CONFIGURATION_STRING, |
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"configuration string"); |
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if (err) |
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return err; |
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} |
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if (!(wacom->max_x && wacom->max_y)) { |
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err = wacom_send_and_wait(wacom, serio, |
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REQUEST_MAX_COORDINATES, |
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"coordinates string"); |
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if (err) |
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return err; |
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} |
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return wacom_send_setup_string(wacom, serio); |
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} |
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static int wacom_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct wacom *wacom; |
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struct input_dev *input_dev; |
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int err = -ENOMEM; |
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|
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wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!wacom || !input_dev) |
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goto free_device; |
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wacom->dev = input_dev; |
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wacom->extra_z_bits = 1; |
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wacom->eraser_mask = 0x04; |
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wacom->tool = wacom->idx = 0; |
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snprintf(wacom->phys, sizeof(wacom->phys), "%s/input0", serio->phys); |
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input_dev->phys = wacom->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_WACOM_IV; |
|
input_dev->id.product = serio->id.extra; |
|
input_dev->dev.parent = &serio->dev; |
|
|
|
input_dev->evbit[0] = |
|
BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | BIT_MASK(EV_REL); |
|
set_bit(ABS_MISC, input_dev->absbit); |
|
set_bit(BTN_TOOL_PEN, input_dev->keybit); |
|
set_bit(BTN_TOOL_RUBBER, input_dev->keybit); |
|
set_bit(BTN_TOOL_MOUSE, input_dev->keybit); |
|
set_bit(BTN_TOUCH, input_dev->keybit); |
|
set_bit(BTN_STYLUS, input_dev->keybit); |
|
set_bit(BTN_LEFT, input_dev->keybit); |
|
set_bit(BTN_RIGHT, input_dev->keybit); |
|
set_bit(BTN_MIDDLE, input_dev->keybit); |
|
|
|
serio_set_drvdata(serio, wacom); |
|
|
|
err = serio_open(serio, drv); |
|
if (err) |
|
goto free_device; |
|
|
|
err = wacom_setup(wacom, serio); |
|
if (err) |
|
goto close_serio; |
|
|
|
set_bit(INPUT_PROP_DIRECT, input_dev->propbit); |
|
if (!(wacom->flags & F_COVERS_SCREEN)) |
|
__set_bit(INPUT_PROP_POINTER, input_dev->propbit); |
|
|
|
if (wacom->flags & F_HAS_STYLUS2) |
|
__set_bit(BTN_STYLUS2, input_dev->keybit); |
|
|
|
if (wacom->flags & F_HAS_SCROLLWHEEL) |
|
__set_bit(REL_WHEEL, input_dev->relbit); |
|
|
|
input_abs_set_res(wacom->dev, ABS_X, wacom->res_x); |
|
input_abs_set_res(wacom->dev, ABS_Y, wacom->res_y); |
|
input_set_abs_params(wacom->dev, ABS_X, 0, wacom->max_x, 0, 0); |
|
input_set_abs_params(wacom->dev, ABS_Y, 0, wacom->max_y, 0, 0); |
|
input_set_abs_params(wacom->dev, ABS_PRESSURE, -1, |
|
(1 << (7 + wacom->extra_z_bits)) - 1, 0, 0); |
|
|
|
err = input_register_device(wacom->dev); |
|
if (err) |
|
goto close_serio; |
|
|
|
return 0; |
|
|
|
close_serio: |
|
serio_close(serio); |
|
free_device: |
|
serio_set_drvdata(serio, NULL); |
|
input_free_device(input_dev); |
|
kfree(wacom); |
|
return err; |
|
} |
|
|
|
static const struct serio_device_id wacom_serio_ids[] = { |
|
{ |
|
.type = SERIO_RS232, |
|
.proto = SERIO_WACOM_IV, |
|
.id = SERIO_ANY, |
|
.extra = SERIO_ANY, |
|
}, |
|
{ 0 } |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(serio, wacom_serio_ids); |
|
|
|
static struct serio_driver wacom_drv = { |
|
.driver = { |
|
.name = "wacom_serial4", |
|
}, |
|
.description = "Wacom protocol 4 serial tablet driver", |
|
.id_table = wacom_serio_ids, |
|
.interrupt = wacom_interrupt, |
|
.connect = wacom_connect, |
|
.disconnect = wacom_disconnect, |
|
}; |
|
|
|
module_serio_driver(wacom_drv);
|
|
|